Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 Oracle. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public |
| 6 | * License v2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public |
| 14 | * License along with this program; if not, write to the |
| 15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| 16 | * Boston, MA 021110-1307, USA. |
| 17 | */ |
| 18 | |
Chris Mason | 8f18cf1 | 2008-04-25 16:53:30 -0400 | [diff] [blame] | 19 | #include <linux/kernel.h> |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 20 | #include <linux/bio.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 21 | #include <linux/buffer_head.h> |
Sage Weil | f2eb0a2 | 2008-05-02 14:43:14 -0400 | [diff] [blame] | 22 | #include <linux/file.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 23 | #include <linux/fs.h> |
| 24 | #include <linux/pagemap.h> |
| 25 | #include <linux/highmem.h> |
| 26 | #include <linux/time.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/string.h> |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 29 | #include <linux/backing-dev.h> |
| 30 | #include <linux/mpage.h> |
| 31 | #include <linux/swap.h> |
| 32 | #include <linux/writeback.h> |
| 33 | #include <linux/statfs.h> |
| 34 | #include <linux/compat.h> |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 35 | #include <linux/bit_spinlock.h> |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 36 | #include <linux/xattr.h> |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 37 | #include <linux/posix_acl.h> |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 38 | #include <linux/falloc.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 39 | #include <linux/slab.h> |
David Sterba | 7a36dde | 2011-05-06 15:33:15 +0200 | [diff] [blame] | 40 | #include <linux/ratelimit.h> |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 41 | #include <linux/mount.h> |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 42 | #include "compat.h" |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 43 | #include "ctree.h" |
| 44 | #include "disk-io.h" |
| 45 | #include "transaction.h" |
| 46 | #include "btrfs_inode.h" |
| 47 | #include "ioctl.h" |
| 48 | #include "print-tree.h" |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 49 | #include "ordered-data.h" |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 50 | #include "xattr.h" |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 51 | #include "tree-log.h" |
Jan Schmidt | 4a54c8c | 2011-07-22 15:41:52 +0200 | [diff] [blame] | 52 | #include "volumes.h" |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 53 | #include "compression.h" |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 54 | #include "locking.h" |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 55 | #include "free-space-cache.h" |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 56 | #include "inode-map.h" |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 57 | |
| 58 | struct btrfs_iget_args { |
| 59 | u64 ino; |
| 60 | struct btrfs_root *root; |
| 61 | }; |
| 62 | |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 63 | static const struct inode_operations btrfs_dir_inode_operations; |
| 64 | static const struct inode_operations btrfs_symlink_inode_operations; |
| 65 | static const struct inode_operations btrfs_dir_ro_inode_operations; |
| 66 | static const struct inode_operations btrfs_special_inode_operations; |
| 67 | static const struct inode_operations btrfs_file_inode_operations; |
Alexey Dobriyan | 7f09410 | 2009-09-21 17:01:10 -0700 | [diff] [blame] | 68 | static const struct address_space_operations btrfs_aops; |
| 69 | static const struct address_space_operations btrfs_symlink_aops; |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 70 | static const struct file_operations btrfs_dir_file_operations; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 71 | static struct extent_io_ops btrfs_extent_io_ops; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 72 | |
| 73 | static struct kmem_cache *btrfs_inode_cachep; |
| 74 | struct kmem_cache *btrfs_trans_handle_cachep; |
| 75 | struct kmem_cache *btrfs_transaction_cachep; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 76 | struct kmem_cache *btrfs_path_cachep; |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 77 | struct kmem_cache *btrfs_free_space_cachep; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 78 | |
| 79 | #define S_SHIFT 12 |
| 80 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { |
| 81 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, |
| 82 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, |
| 83 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, |
| 84 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, |
| 85 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, |
| 86 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, |
| 87 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, |
| 88 | }; |
| 89 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 90 | static int btrfs_setsize(struct inode *inode, loff_t newsize); |
| 91 | static int btrfs_truncate(struct inode *inode); |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 92 | static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 93 | static noinline int cow_file_range(struct inode *inode, |
| 94 | struct page *locked_page, |
| 95 | u64 start, u64 end, int *page_started, |
| 96 | unsigned long *nr_written, int unlock); |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 97 | static noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, |
| 98 | struct btrfs_root *root, struct inode *inode); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 99 | |
Yan, Zheng | f34f57a | 2009-11-12 09:35:27 +0000 | [diff] [blame] | 100 | static int btrfs_init_inode_security(struct btrfs_trans_handle *trans, |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 101 | struct inode *inode, struct inode *dir, |
| 102 | const struct qstr *qstr) |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 103 | { |
| 104 | int err; |
| 105 | |
Yan, Zheng | f34f57a | 2009-11-12 09:35:27 +0000 | [diff] [blame] | 106 | err = btrfs_init_acl(trans, inode, dir); |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 107 | if (!err) |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 108 | err = btrfs_xattr_security_init(trans, inode, dir, qstr); |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 109 | return err; |
| 110 | } |
| 111 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 112 | /* |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 113 | * this does all the hard work for inserting an inline extent into |
| 114 | * the btree. The caller should have done a btrfs_drop_extents so that |
| 115 | * no overlapping inline items exist in the btree |
| 116 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 117 | static noinline int insert_inline_extent(struct btrfs_trans_handle *trans, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 118 | struct btrfs_root *root, struct inode *inode, |
| 119 | u64 start, size_t size, size_t compressed_size, |
Li Zefan | fe3f566 | 2011-03-28 08:30:38 +0000 | [diff] [blame] | 120 | int compress_type, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 121 | struct page **compressed_pages) |
| 122 | { |
| 123 | struct btrfs_key key; |
| 124 | struct btrfs_path *path; |
| 125 | struct extent_buffer *leaf; |
| 126 | struct page *page = NULL; |
| 127 | char *kaddr; |
| 128 | unsigned long ptr; |
| 129 | struct btrfs_file_extent_item *ei; |
| 130 | int err = 0; |
| 131 | int ret; |
| 132 | size_t cur_size = size; |
| 133 | size_t datasize; |
| 134 | unsigned long offset; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 135 | |
Li Zefan | fe3f566 | 2011-03-28 08:30:38 +0000 | [diff] [blame] | 136 | if (compressed_size && compressed_pages) |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 137 | cur_size = compressed_size; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 138 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 139 | path = btrfs_alloc_path(); |
| 140 | if (!path) |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 141 | return -ENOMEM; |
| 142 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 143 | path->leave_spinning = 1; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 144 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 145 | key.objectid = btrfs_ino(inode); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 146 | key.offset = start; |
| 147 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 148 | datasize = btrfs_file_extent_calc_inline_size(cur_size); |
| 149 | |
| 150 | inode_add_bytes(inode, size); |
| 151 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 152 | datasize); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 153 | if (ret) { |
| 154 | err = ret; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 155 | goto fail; |
| 156 | } |
| 157 | leaf = path->nodes[0]; |
| 158 | ei = btrfs_item_ptr(leaf, path->slots[0], |
| 159 | struct btrfs_file_extent_item); |
| 160 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); |
| 161 | btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); |
| 162 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
| 163 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); |
| 164 | btrfs_set_file_extent_ram_bytes(leaf, ei, size); |
| 165 | ptr = btrfs_file_extent_inline_start(ei); |
| 166 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 167 | if (compress_type != BTRFS_COMPRESS_NONE) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 168 | struct page *cpage; |
| 169 | int i = 0; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 170 | while (compressed_size > 0) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 171 | cpage = compressed_pages[i]; |
Chris Mason | 5b050f0 | 2008-11-11 09:34:41 -0500 | [diff] [blame] | 172 | cur_size = min_t(unsigned long, compressed_size, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 173 | PAGE_CACHE_SIZE); |
| 174 | |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 175 | kaddr = kmap_atomic(cpage); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 176 | write_extent_buffer(leaf, kaddr, ptr, cur_size); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 177 | kunmap_atomic(kaddr); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 178 | |
| 179 | i++; |
| 180 | ptr += cur_size; |
| 181 | compressed_size -= cur_size; |
| 182 | } |
| 183 | btrfs_set_file_extent_compression(leaf, ei, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 184 | compress_type); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 185 | } else { |
| 186 | page = find_get_page(inode->i_mapping, |
| 187 | start >> PAGE_CACHE_SHIFT); |
| 188 | btrfs_set_file_extent_compression(leaf, ei, 0); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 189 | kaddr = kmap_atomic(page); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 190 | offset = start & (PAGE_CACHE_SIZE - 1); |
| 191 | write_extent_buffer(leaf, kaddr + offset, ptr, size); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 192 | kunmap_atomic(kaddr); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 193 | page_cache_release(page); |
| 194 | } |
| 195 | btrfs_mark_buffer_dirty(leaf); |
| 196 | btrfs_free_path(path); |
| 197 | |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 198 | /* |
| 199 | * we're an inline extent, so nobody can |
| 200 | * extend the file past i_size without locking |
| 201 | * a page we already have locked. |
| 202 | * |
| 203 | * We must do any isize and inode updates |
| 204 | * before we unlock the pages. Otherwise we |
| 205 | * could end up racing with unlink. |
| 206 | */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 207 | BTRFS_I(inode)->disk_i_size = inode->i_size; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 208 | ret = btrfs_update_inode(trans, root, inode); |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 209 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 210 | return ret; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 211 | fail: |
| 212 | btrfs_free_path(path); |
| 213 | return err; |
| 214 | } |
| 215 | |
| 216 | |
| 217 | /* |
| 218 | * conditionally insert an inline extent into the file. This |
| 219 | * does the checks required to make sure the data is small enough |
| 220 | * to fit as an inline extent. |
| 221 | */ |
Chris Mason | 7f366cf | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 222 | static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 223 | struct btrfs_root *root, |
| 224 | struct inode *inode, u64 start, u64 end, |
Li Zefan | fe3f566 | 2011-03-28 08:30:38 +0000 | [diff] [blame] | 225 | size_t compressed_size, int compress_type, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 226 | struct page **compressed_pages) |
| 227 | { |
| 228 | u64 isize = i_size_read(inode); |
| 229 | u64 actual_end = min(end + 1, isize); |
| 230 | u64 inline_len = actual_end - start; |
| 231 | u64 aligned_end = (end + root->sectorsize - 1) & |
| 232 | ~((u64)root->sectorsize - 1); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 233 | u64 data_len = inline_len; |
| 234 | int ret; |
| 235 | |
| 236 | if (compressed_size) |
| 237 | data_len = compressed_size; |
| 238 | |
| 239 | if (start > 0 || |
Chris Mason | 70b99e6 | 2008-10-31 12:46:39 -0400 | [diff] [blame] | 240 | actual_end >= PAGE_CACHE_SIZE || |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 241 | data_len >= BTRFS_MAX_INLINE_DATA_SIZE(root) || |
| 242 | (!compressed_size && |
| 243 | (actual_end & (root->sectorsize - 1)) == 0) || |
| 244 | end + 1 < isize || |
| 245 | data_len > root->fs_info->max_inline) { |
| 246 | return 1; |
| 247 | } |
| 248 | |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 249 | ret = btrfs_drop_extents(trans, root, inode, start, aligned_end, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 250 | if (ret) |
| 251 | return ret; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 252 | |
| 253 | if (isize > actual_end) |
| 254 | inline_len = min_t(u64, isize, actual_end); |
| 255 | ret = insert_inline_extent(trans, root, inode, start, |
| 256 | inline_len, compressed_size, |
Li Zefan | fe3f566 | 2011-03-28 08:30:38 +0000 | [diff] [blame] | 257 | compress_type, compressed_pages); |
Josef Bacik | 2adcac1 | 2012-05-23 16:10:14 -0400 | [diff] [blame] | 258 | if (ret && ret != -ENOSPC) { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 259 | btrfs_abort_transaction(trans, root, ret); |
| 260 | return ret; |
Josef Bacik | 2adcac1 | 2012-05-23 16:10:14 -0400 | [diff] [blame] | 261 | } else if (ret == -ENOSPC) { |
| 262 | return 1; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 263 | } |
Josef Bacik | 2adcac1 | 2012-05-23 16:10:14 -0400 | [diff] [blame] | 264 | |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 265 | btrfs_delalloc_release_metadata(inode, end + 1 - start); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 266 | btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 267 | return 0; |
| 268 | } |
| 269 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 270 | struct async_extent { |
| 271 | u64 start; |
| 272 | u64 ram_size; |
| 273 | u64 compressed_size; |
| 274 | struct page **pages; |
| 275 | unsigned long nr_pages; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 276 | int compress_type; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 277 | struct list_head list; |
| 278 | }; |
| 279 | |
| 280 | struct async_cow { |
| 281 | struct inode *inode; |
| 282 | struct btrfs_root *root; |
| 283 | struct page *locked_page; |
| 284 | u64 start; |
| 285 | u64 end; |
| 286 | struct list_head extents; |
| 287 | struct btrfs_work work; |
| 288 | }; |
| 289 | |
| 290 | static noinline int add_async_extent(struct async_cow *cow, |
| 291 | u64 start, u64 ram_size, |
| 292 | u64 compressed_size, |
| 293 | struct page **pages, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 294 | unsigned long nr_pages, |
| 295 | int compress_type) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 296 | { |
| 297 | struct async_extent *async_extent; |
| 298 | |
| 299 | async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 300 | BUG_ON(!async_extent); /* -ENOMEM */ |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 301 | async_extent->start = start; |
| 302 | async_extent->ram_size = ram_size; |
| 303 | async_extent->compressed_size = compressed_size; |
| 304 | async_extent->pages = pages; |
| 305 | async_extent->nr_pages = nr_pages; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 306 | async_extent->compress_type = compress_type; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 307 | list_add_tail(&async_extent->list, &cow->extents); |
| 308 | return 0; |
| 309 | } |
| 310 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 311 | /* |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 312 | * we create compressed extents in two phases. The first |
| 313 | * phase compresses a range of pages that have already been |
| 314 | * locked (both pages and state bits are locked). |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 315 | * |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 316 | * This is done inside an ordered work queue, and the compression |
| 317 | * is spread across many cpus. The actual IO submission is step |
| 318 | * two, and the ordered work queue takes care of making sure that |
| 319 | * happens in the same order things were put onto the queue by |
| 320 | * writepages and friends. |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 321 | * |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 322 | * If this code finds it can't get good compression, it puts an |
| 323 | * entry onto the work queue to write the uncompressed bytes. This |
| 324 | * makes sure that both compressed inodes and uncompressed inodes |
Artem Bityutskiy | b257031 | 2012-07-25 18:12:06 +0300 | [diff] [blame] | 325 | * are written in the same order that the flusher thread sent them |
| 326 | * down. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 327 | */ |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 328 | static noinline int compress_file_range(struct inode *inode, |
| 329 | struct page *locked_page, |
| 330 | u64 start, u64 end, |
| 331 | struct async_cow *async_cow, |
| 332 | int *num_added) |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 333 | { |
| 334 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 335 | struct btrfs_trans_handle *trans; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 336 | u64 num_bytes; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 337 | u64 blocksize = root->sectorsize; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 338 | u64 actual_end; |
Chris Mason | 42dc7ba | 2008-12-15 11:44:56 -0500 | [diff] [blame] | 339 | u64 isize = i_size_read(inode); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 340 | int ret = 0; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 341 | struct page **pages = NULL; |
| 342 | unsigned long nr_pages; |
| 343 | unsigned long nr_pages_ret = 0; |
| 344 | unsigned long total_compressed = 0; |
| 345 | unsigned long total_in = 0; |
| 346 | unsigned long max_compressed = 128 * 1024; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 347 | unsigned long max_uncompressed = 128 * 1024; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 348 | int i; |
| 349 | int will_compress; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 350 | int compress_type = root->fs_info->compress_type; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 351 | |
Liu Bo | 4cb13e5 | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 352 | /* if this is a small write inside eof, kick off a defrag */ |
| 353 | if ((end - start + 1) < 16 * 1024 && |
| 354 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 355 | btrfs_add_inode_defrag(NULL, inode); |
| 356 | |
Chris Mason | 42dc7ba | 2008-12-15 11:44:56 -0500 | [diff] [blame] | 357 | actual_end = min_t(u64, isize, end + 1); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 358 | again: |
| 359 | will_compress = 0; |
| 360 | nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1; |
| 361 | nr_pages = min(nr_pages, (128 * 1024UL) / PAGE_CACHE_SIZE); |
| 362 | |
Chris Mason | f03d9301f | 2009-02-04 09:31:06 -0500 | [diff] [blame] | 363 | /* |
| 364 | * we don't want to send crud past the end of i_size through |
| 365 | * compression, that's just a waste of CPU time. So, if the |
| 366 | * end of the file is before the start of our current |
| 367 | * requested range of bytes, we bail out to the uncompressed |
| 368 | * cleanup code that can deal with all of this. |
| 369 | * |
| 370 | * It isn't really the fastest way to fix things, but this is a |
| 371 | * very uncommon corner. |
| 372 | */ |
| 373 | if (actual_end <= start) |
| 374 | goto cleanup_and_bail_uncompressed; |
| 375 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 376 | total_compressed = actual_end - start; |
| 377 | |
| 378 | /* we want to make sure that amount of ram required to uncompress |
| 379 | * an extent is reasonable, so we limit the total size in ram |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 380 | * of a compressed extent to 128k. This is a crucial number |
| 381 | * because it also controls how easily we can spread reads across |
| 382 | * cpus for decompression. |
| 383 | * |
| 384 | * We also want to make sure the amount of IO required to do |
| 385 | * a random read is reasonably small, so we limit the size of |
| 386 | * a compressed extent to 128k. |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 387 | */ |
| 388 | total_compressed = min(total_compressed, max_uncompressed); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 389 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 390 | num_bytes = max(blocksize, num_bytes); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 391 | total_in = 0; |
| 392 | ret = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 393 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 394 | /* |
| 395 | * we do compression for mount -o compress and when the |
| 396 | * inode has not been flagged as nocompress. This flag can |
| 397 | * change at any time if we discover bad compression ratios. |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 398 | */ |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 399 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) && |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 400 | (btrfs_test_opt(root, COMPRESS) || |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 401 | (BTRFS_I(inode)->force_compress) || |
| 402 | (BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS))) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 403 | WARN_ON(pages); |
Chris Mason | cfbc246 | 2008-10-30 13:22:14 -0400 | [diff] [blame] | 404 | pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS); |
Li Zefan | 560f7d7 | 2011-09-08 10:22:01 +0800 | [diff] [blame] | 405 | if (!pages) { |
| 406 | /* just bail out to the uncompressed code */ |
| 407 | goto cont; |
| 408 | } |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 409 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 410 | if (BTRFS_I(inode)->force_compress) |
| 411 | compress_type = BTRFS_I(inode)->force_compress; |
| 412 | |
| 413 | ret = btrfs_compress_pages(compress_type, |
| 414 | inode->i_mapping, start, |
| 415 | total_compressed, pages, |
| 416 | nr_pages, &nr_pages_ret, |
| 417 | &total_in, |
| 418 | &total_compressed, |
| 419 | max_compressed); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 420 | |
| 421 | if (!ret) { |
| 422 | unsigned long offset = total_compressed & |
| 423 | (PAGE_CACHE_SIZE - 1); |
| 424 | struct page *page = pages[nr_pages_ret - 1]; |
| 425 | char *kaddr; |
| 426 | |
| 427 | /* zero the tail end of the last page, we might be |
| 428 | * sending it down to disk |
| 429 | */ |
| 430 | if (offset) { |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 431 | kaddr = kmap_atomic(page); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 432 | memset(kaddr + offset, 0, |
| 433 | PAGE_CACHE_SIZE - offset); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 434 | kunmap_atomic(kaddr); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 435 | } |
| 436 | will_compress = 1; |
| 437 | } |
| 438 | } |
Li Zefan | 560f7d7 | 2011-09-08 10:22:01 +0800 | [diff] [blame] | 439 | cont: |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 440 | if (start == 0) { |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 441 | trans = btrfs_join_transaction(root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 442 | if (IS_ERR(trans)) { |
| 443 | ret = PTR_ERR(trans); |
| 444 | trans = NULL; |
| 445 | goto cleanup_and_out; |
| 446 | } |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 447 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 448 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 449 | /* lets try to make an inline extent */ |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 450 | if (ret || total_in < (actual_end - start)) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 451 | /* we didn't compress the entire range, try |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 452 | * to make an uncompressed inline extent. |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 453 | */ |
| 454 | ret = cow_file_range_inline(trans, root, inode, |
Li Zefan | fe3f566 | 2011-03-28 08:30:38 +0000 | [diff] [blame] | 455 | start, end, 0, 0, NULL); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 456 | } else { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 457 | /* try making a compressed inline extent */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 458 | ret = cow_file_range_inline(trans, root, inode, |
| 459 | start, end, |
Li Zefan | fe3f566 | 2011-03-28 08:30:38 +0000 | [diff] [blame] | 460 | total_compressed, |
| 461 | compress_type, pages); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 462 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 463 | if (ret <= 0) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 464 | /* |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 465 | * inline extent creation worked or returned error, |
| 466 | * we don't need to create any more async work items. |
| 467 | * Unlock and free up our temp pages. |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 468 | */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 469 | extent_clear_unlock_delalloc(inode, |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 470 | &BTRFS_I(inode)->io_tree, |
| 471 | start, end, NULL, |
| 472 | EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY | |
Chris Mason | a3429ab | 2009-10-08 12:30:20 -0400 | [diff] [blame] | 473 | EXTENT_CLEAR_DELALLOC | |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 474 | EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK); |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 475 | |
| 476 | btrfs_end_transaction(trans, root); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 477 | goto free_pages_out; |
| 478 | } |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 479 | btrfs_end_transaction(trans, root); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | if (will_compress) { |
| 483 | /* |
| 484 | * we aren't doing an inline extent round the compressed size |
| 485 | * up to a block size boundary so the allocator does sane |
| 486 | * things |
| 487 | */ |
| 488 | total_compressed = (total_compressed + blocksize - 1) & |
| 489 | ~(blocksize - 1); |
| 490 | |
| 491 | /* |
| 492 | * one last check to make sure the compression is really a |
| 493 | * win, compare the page count read with the blocks on disk |
| 494 | */ |
| 495 | total_in = (total_in + PAGE_CACHE_SIZE - 1) & |
| 496 | ~(PAGE_CACHE_SIZE - 1); |
| 497 | if (total_compressed >= total_in) { |
| 498 | will_compress = 0; |
| 499 | } else { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 500 | num_bytes = total_in; |
| 501 | } |
| 502 | } |
| 503 | if (!will_compress && pages) { |
| 504 | /* |
| 505 | * the compression code ran but failed to make things smaller, |
| 506 | * free any pages it allocated and our page pointer array |
| 507 | */ |
| 508 | for (i = 0; i < nr_pages_ret; i++) { |
Chris Mason | 70b99e6 | 2008-10-31 12:46:39 -0400 | [diff] [blame] | 509 | WARN_ON(pages[i]->mapping); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 510 | page_cache_release(pages[i]); |
| 511 | } |
| 512 | kfree(pages); |
| 513 | pages = NULL; |
| 514 | total_compressed = 0; |
| 515 | nr_pages_ret = 0; |
| 516 | |
| 517 | /* flag the file so we don't compress in the future */ |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 518 | if (!btrfs_test_opt(root, FORCE_COMPRESS) && |
| 519 | !(BTRFS_I(inode)->force_compress)) { |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 520 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 521 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 522 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 523 | if (will_compress) { |
| 524 | *num_added += 1; |
| 525 | |
| 526 | /* the async work queues will take care of doing actual |
| 527 | * allocation on disk for these compressed pages, |
| 528 | * and will submit them to the elevator. |
| 529 | */ |
| 530 | add_async_extent(async_cow, start, num_bytes, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 531 | total_compressed, pages, nr_pages_ret, |
| 532 | compress_type); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 533 | |
Yan, Zheng | 24ae636 | 2010-12-06 07:02:36 +0000 | [diff] [blame] | 534 | if (start + num_bytes < end) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 535 | start += num_bytes; |
| 536 | pages = NULL; |
| 537 | cond_resched(); |
| 538 | goto again; |
| 539 | } |
| 540 | } else { |
Chris Mason | f03d9301f | 2009-02-04 09:31:06 -0500 | [diff] [blame] | 541 | cleanup_and_bail_uncompressed: |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 542 | /* |
| 543 | * No compression, but we still need to write the pages in |
| 544 | * the file we've been given so far. redirty the locked |
| 545 | * page if it corresponds to our extent and set things up |
| 546 | * for the async work queue to run cow_file_range to do |
| 547 | * the normal delalloc dance |
| 548 | */ |
| 549 | if (page_offset(locked_page) >= start && |
| 550 | page_offset(locked_page) <= end) { |
| 551 | __set_page_dirty_nobuffers(locked_page); |
| 552 | /* unlocked later on in the async handlers */ |
| 553 | } |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 554 | add_async_extent(async_cow, start, end - start + 1, |
| 555 | 0, NULL, 0, BTRFS_COMPRESS_NONE); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 556 | *num_added += 1; |
| 557 | } |
| 558 | |
| 559 | out: |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 560 | return ret; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 561 | |
| 562 | free_pages_out: |
| 563 | for (i = 0; i < nr_pages_ret; i++) { |
| 564 | WARN_ON(pages[i]->mapping); |
| 565 | page_cache_release(pages[i]); |
| 566 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 567 | kfree(pages); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 568 | |
| 569 | goto out; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 570 | |
| 571 | cleanup_and_out: |
| 572 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
| 573 | start, end, NULL, |
| 574 | EXTENT_CLEAR_UNLOCK_PAGE | |
| 575 | EXTENT_CLEAR_DIRTY | |
| 576 | EXTENT_CLEAR_DELALLOC | |
| 577 | EXTENT_SET_WRITEBACK | |
| 578 | EXTENT_END_WRITEBACK); |
| 579 | if (!trans || IS_ERR(trans)) |
| 580 | btrfs_error(root->fs_info, ret, "Failed to join transaction"); |
| 581 | else |
| 582 | btrfs_abort_transaction(trans, root, ret); |
| 583 | goto free_pages_out; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 584 | } |
| 585 | |
| 586 | /* |
| 587 | * phase two of compressed writeback. This is the ordered portion |
| 588 | * of the code, which only gets called in the order the work was |
| 589 | * queued. We walk all the async extents created by compress_file_range |
| 590 | * and send them down to the disk. |
| 591 | */ |
| 592 | static noinline int submit_compressed_extents(struct inode *inode, |
| 593 | struct async_cow *async_cow) |
| 594 | { |
| 595 | struct async_extent *async_extent; |
| 596 | u64 alloc_hint = 0; |
| 597 | struct btrfs_trans_handle *trans; |
| 598 | struct btrfs_key ins; |
| 599 | struct extent_map *em; |
| 600 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 601 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 602 | struct extent_io_tree *io_tree; |
Josef Bacik | f5a84ee3 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 603 | int ret = 0; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 604 | |
| 605 | if (list_empty(&async_cow->extents)) |
| 606 | return 0; |
| 607 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 608 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 609 | while (!list_empty(&async_cow->extents)) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 610 | async_extent = list_entry(async_cow->extents.next, |
| 611 | struct async_extent, list); |
| 612 | list_del(&async_extent->list); |
| 613 | |
| 614 | io_tree = &BTRFS_I(inode)->io_tree; |
| 615 | |
Josef Bacik | f5a84ee3 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 616 | retry: |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 617 | /* did the compression code fall back to uncompressed IO? */ |
| 618 | if (!async_extent->pages) { |
| 619 | int page_started = 0; |
| 620 | unsigned long nr_written = 0; |
| 621 | |
| 622 | lock_extent(io_tree, async_extent->start, |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 623 | async_extent->start + |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 624 | async_extent->ram_size - 1); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 625 | |
| 626 | /* allocate blocks */ |
Josef Bacik | f5a84ee3 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 627 | ret = cow_file_range(inode, async_cow->locked_page, |
| 628 | async_extent->start, |
| 629 | async_extent->start + |
| 630 | async_extent->ram_size - 1, |
| 631 | &page_started, &nr_written, 0); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 632 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 633 | /* JDM XXX */ |
| 634 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 635 | /* |
| 636 | * if page_started, cow_file_range inserted an |
| 637 | * inline extent and took care of all the unlocking |
| 638 | * and IO for us. Otherwise, we need to submit |
| 639 | * all those pages down to the drive. |
| 640 | */ |
Josef Bacik | f5a84ee3 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 641 | if (!page_started && !ret) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 642 | extent_write_locked_range(io_tree, |
| 643 | inode, async_extent->start, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 644 | async_extent->start + |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 645 | async_extent->ram_size - 1, |
| 646 | btrfs_get_extent, |
| 647 | WB_SYNC_ALL); |
| 648 | kfree(async_extent); |
| 649 | cond_resched(); |
| 650 | continue; |
| 651 | } |
| 652 | |
| 653 | lock_extent(io_tree, async_extent->start, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 654 | async_extent->start + async_extent->ram_size - 1); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 655 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 656 | trans = btrfs_join_transaction(root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 657 | if (IS_ERR(trans)) { |
| 658 | ret = PTR_ERR(trans); |
| 659 | } else { |
| 660 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
| 661 | ret = btrfs_reserve_extent(trans, root, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 662 | async_extent->compressed_size, |
| 663 | async_extent->compressed_size, |
Josef Bacik | 81c9ad2 | 2012-01-18 10:56:06 -0500 | [diff] [blame] | 664 | 0, alloc_hint, &ins, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 665 | if (ret) |
| 666 | btrfs_abort_transaction(trans, root, ret); |
| 667 | btrfs_end_transaction(trans, root); |
| 668 | } |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 669 | |
Josef Bacik | f5a84ee3 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 670 | if (ret) { |
| 671 | int i; |
| 672 | for (i = 0; i < async_extent->nr_pages; i++) { |
| 673 | WARN_ON(async_extent->pages[i]->mapping); |
| 674 | page_cache_release(async_extent->pages[i]); |
| 675 | } |
| 676 | kfree(async_extent->pages); |
| 677 | async_extent->nr_pages = 0; |
| 678 | async_extent->pages = NULL; |
| 679 | unlock_extent(io_tree, async_extent->start, |
| 680 | async_extent->start + |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 681 | async_extent->ram_size - 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 682 | if (ret == -ENOSPC) |
| 683 | goto retry; |
| 684 | goto out_free; /* JDM: Requeue? */ |
Josef Bacik | f5a84ee3 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 685 | } |
| 686 | |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 687 | /* |
| 688 | * here we're doing allocation and writeback of the |
| 689 | * compressed pages |
| 690 | */ |
| 691 | btrfs_drop_extent_cache(inode, async_extent->start, |
| 692 | async_extent->start + |
| 693 | async_extent->ram_size - 1, 0); |
| 694 | |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 695 | em = alloc_extent_map(); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 696 | BUG_ON(!em); /* -ENOMEM */ |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 697 | em->start = async_extent->start; |
| 698 | em->len = async_extent->ram_size; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 699 | em->orig_start = em->start; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 700 | |
| 701 | em->block_start = ins.objectid; |
| 702 | em->block_len = ins.offset; |
| 703 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 704 | em->compress_type = async_extent->compress_type; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 705 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
| 706 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
| 707 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 708 | while (1) { |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 709 | write_lock(&em_tree->lock); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 710 | ret = add_extent_mapping(em_tree, em); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 711 | write_unlock(&em_tree->lock); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 712 | if (ret != -EEXIST) { |
| 713 | free_extent_map(em); |
| 714 | break; |
| 715 | } |
| 716 | btrfs_drop_extent_cache(inode, async_extent->start, |
| 717 | async_extent->start + |
| 718 | async_extent->ram_size - 1, 0); |
| 719 | } |
| 720 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 721 | ret = btrfs_add_ordered_extent_compress(inode, |
| 722 | async_extent->start, |
| 723 | ins.objectid, |
| 724 | async_extent->ram_size, |
| 725 | ins.offset, |
| 726 | BTRFS_ORDERED_COMPRESSED, |
| 727 | async_extent->compress_type); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 728 | BUG_ON(ret); /* -ENOMEM */ |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 729 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 730 | /* |
| 731 | * clear dirty, set writeback and unlock the pages. |
| 732 | */ |
| 733 | extent_clear_unlock_delalloc(inode, |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 734 | &BTRFS_I(inode)->io_tree, |
| 735 | async_extent->start, |
| 736 | async_extent->start + |
| 737 | async_extent->ram_size - 1, |
| 738 | NULL, EXTENT_CLEAR_UNLOCK_PAGE | |
| 739 | EXTENT_CLEAR_UNLOCK | |
Chris Mason | a3429ab | 2009-10-08 12:30:20 -0400 | [diff] [blame] | 740 | EXTENT_CLEAR_DELALLOC | |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 741 | EXTENT_CLEAR_DIRTY | EXTENT_SET_WRITEBACK); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 742 | |
| 743 | ret = btrfs_submit_compressed_write(inode, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 744 | async_extent->start, |
| 745 | async_extent->ram_size, |
| 746 | ins.objectid, |
| 747 | ins.offset, async_extent->pages, |
| 748 | async_extent->nr_pages); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 749 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 750 | BUG_ON(ret); /* -ENOMEM */ |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 751 | alloc_hint = ins.objectid + ins.offset; |
| 752 | kfree(async_extent); |
| 753 | cond_resched(); |
| 754 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 755 | ret = 0; |
| 756 | out: |
| 757 | return ret; |
| 758 | out_free: |
| 759 | kfree(async_extent); |
| 760 | goto out; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 761 | } |
| 762 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 763 | static u64 get_extent_allocation_hint(struct inode *inode, u64 start, |
| 764 | u64 num_bytes) |
| 765 | { |
| 766 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 767 | struct extent_map *em; |
| 768 | u64 alloc_hint = 0; |
| 769 | |
| 770 | read_lock(&em_tree->lock); |
| 771 | em = search_extent_mapping(em_tree, start, num_bytes); |
| 772 | if (em) { |
| 773 | /* |
| 774 | * if block start isn't an actual block number then find the |
| 775 | * first block in this inode and use that as a hint. If that |
| 776 | * block is also bogus then just don't worry about it. |
| 777 | */ |
| 778 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
| 779 | free_extent_map(em); |
| 780 | em = search_extent_mapping(em_tree, 0, 0); |
| 781 | if (em && em->block_start < EXTENT_MAP_LAST_BYTE) |
| 782 | alloc_hint = em->block_start; |
| 783 | if (em) |
| 784 | free_extent_map(em); |
| 785 | } else { |
| 786 | alloc_hint = em->block_start; |
| 787 | free_extent_map(em); |
| 788 | } |
| 789 | } |
| 790 | read_unlock(&em_tree->lock); |
| 791 | |
| 792 | return alloc_hint; |
| 793 | } |
| 794 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 795 | /* |
| 796 | * when extent_io.c finds a delayed allocation range in the file, |
| 797 | * the call backs end up in this code. The basic idea is to |
| 798 | * allocate extents on disk for the range, and create ordered data structs |
| 799 | * in ram to track those extents. |
| 800 | * |
| 801 | * locked_page is the page that writepage had locked already. We use |
| 802 | * it to make sure we don't do extra locks or unlocks. |
| 803 | * |
| 804 | * *page_started is set to one if we unlock locked_page and do everything |
| 805 | * required to start IO on it. It may be clean and already done with |
| 806 | * IO when we return. |
| 807 | */ |
| 808 | static noinline int cow_file_range(struct inode *inode, |
| 809 | struct page *locked_page, |
| 810 | u64 start, u64 end, int *page_started, |
| 811 | unsigned long *nr_written, |
| 812 | int unlock) |
| 813 | { |
| 814 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 815 | struct btrfs_trans_handle *trans; |
| 816 | u64 alloc_hint = 0; |
| 817 | u64 num_bytes; |
| 818 | unsigned long ram_size; |
| 819 | u64 disk_num_bytes; |
| 820 | u64 cur_alloc_size; |
| 821 | u64 blocksize = root->sectorsize; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 822 | struct btrfs_key ins; |
| 823 | struct extent_map *em; |
| 824 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 825 | int ret = 0; |
| 826 | |
Liu Bo | 83eea1f | 2012-07-10 05:28:39 -0600 | [diff] [blame] | 827 | BUG_ON(btrfs_is_free_space_inode(inode)); |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 828 | trans = btrfs_join_transaction(root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 829 | if (IS_ERR(trans)) { |
| 830 | extent_clear_unlock_delalloc(inode, |
| 831 | &BTRFS_I(inode)->io_tree, |
Josef Bacik | beb42dd | 2012-05-30 15:35:17 -0400 | [diff] [blame] | 832 | start, end, locked_page, |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 833 | EXTENT_CLEAR_UNLOCK_PAGE | |
| 834 | EXTENT_CLEAR_UNLOCK | |
| 835 | EXTENT_CLEAR_DELALLOC | |
| 836 | EXTENT_CLEAR_DIRTY | |
| 837 | EXTENT_SET_WRITEBACK | |
| 838 | EXTENT_END_WRITEBACK); |
| 839 | return PTR_ERR(trans); |
| 840 | } |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 841 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 842 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 843 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
| 844 | num_bytes = max(blocksize, num_bytes); |
| 845 | disk_num_bytes = num_bytes; |
| 846 | ret = 0; |
| 847 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 848 | /* if this is a small write inside eof, kick off defrag */ |
Liu Bo | 4cb13e5 | 2012-03-29 09:57:45 -0400 | [diff] [blame] | 849 | if (num_bytes < 64 * 1024 && |
| 850 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 851 | btrfs_add_inode_defrag(trans, inode); |
| 852 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 853 | if (start == 0) { |
| 854 | /* lets try to make an inline extent */ |
| 855 | ret = cow_file_range_inline(trans, root, inode, |
Li Zefan | fe3f566 | 2011-03-28 08:30:38 +0000 | [diff] [blame] | 856 | start, end, 0, 0, NULL); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 857 | if (ret == 0) { |
| 858 | extent_clear_unlock_delalloc(inode, |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 859 | &BTRFS_I(inode)->io_tree, |
| 860 | start, end, NULL, |
| 861 | EXTENT_CLEAR_UNLOCK_PAGE | |
| 862 | EXTENT_CLEAR_UNLOCK | |
| 863 | EXTENT_CLEAR_DELALLOC | |
| 864 | EXTENT_CLEAR_DIRTY | |
| 865 | EXTENT_SET_WRITEBACK | |
| 866 | EXTENT_END_WRITEBACK); |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 867 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 868 | *nr_written = *nr_written + |
| 869 | (end - start + PAGE_CACHE_SIZE) / PAGE_CACHE_SIZE; |
| 870 | *page_started = 1; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 871 | goto out; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 872 | } else if (ret < 0) { |
| 873 | btrfs_abort_transaction(trans, root, ret); |
| 874 | goto out_unlock; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 875 | } |
| 876 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 877 | |
| 878 | BUG_ON(disk_num_bytes > |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 879 | btrfs_super_total_bytes(root->fs_info->super_copy)); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 880 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 881 | alloc_hint = get_extent_allocation_hint(inode, start, num_bytes); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 882 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 883 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 884 | while (disk_num_bytes > 0) { |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 885 | unsigned long op; |
| 886 | |
Josef Bacik | 287a0ab | 2010-03-19 18:07:23 +0000 | [diff] [blame] | 887 | cur_alloc_size = disk_num_bytes; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 888 | ret = btrfs_reserve_extent(trans, root, cur_alloc_size, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 889 | root->sectorsize, 0, alloc_hint, |
Josef Bacik | 81c9ad2 | 2012-01-18 10:56:06 -0500 | [diff] [blame] | 890 | &ins, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 891 | if (ret < 0) { |
| 892 | btrfs_abort_transaction(trans, root, ret); |
| 893 | goto out_unlock; |
| 894 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 895 | |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 896 | em = alloc_extent_map(); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 897 | BUG_ON(!em); /* -ENOMEM */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 898 | em->start = start; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 899 | em->orig_start = em->start; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 900 | ram_size = ins.offset; |
| 901 | em->len = ins.offset; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 902 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 903 | em->block_start = ins.objectid; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 904 | em->block_len = ins.offset; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 905 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Chris Mason | 7f3c74f | 2008-07-18 12:01:11 -0400 | [diff] [blame] | 906 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 907 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 908 | while (1) { |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 909 | write_lock(&em_tree->lock); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 910 | ret = add_extent_mapping(em_tree, em); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 911 | write_unlock(&em_tree->lock); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 912 | if (ret != -EEXIST) { |
| 913 | free_extent_map(em); |
| 914 | break; |
| 915 | } |
| 916 | btrfs_drop_extent_cache(inode, start, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 917 | start + ram_size - 1, 0); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 918 | } |
| 919 | |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 920 | cur_alloc_size = ins.offset; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 921 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 922 | ram_size, cur_alloc_size, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 923 | BUG_ON(ret); /* -ENOMEM */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 924 | |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 925 | if (root->root_key.objectid == |
| 926 | BTRFS_DATA_RELOC_TREE_OBJECTID) { |
| 927 | ret = btrfs_reloc_clone_csums(inode, start, |
| 928 | cur_alloc_size); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 929 | if (ret) { |
| 930 | btrfs_abort_transaction(trans, root, ret); |
| 931 | goto out_unlock; |
| 932 | } |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 933 | } |
| 934 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 935 | if (disk_num_bytes < cur_alloc_size) |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 936 | break; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 937 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 938 | /* we're not doing compressed IO, don't unlock the first |
| 939 | * page (which the caller expects to stay locked), don't |
| 940 | * clear any dirty bits and don't set any writeback bits |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 941 | * |
| 942 | * Do set the Private2 bit so we know this page was properly |
| 943 | * setup for writepage |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 944 | */ |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 945 | op = unlock ? EXTENT_CLEAR_UNLOCK_PAGE : 0; |
| 946 | op |= EXTENT_CLEAR_UNLOCK | EXTENT_CLEAR_DELALLOC | |
| 947 | EXTENT_SET_PRIVATE2; |
| 948 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 949 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
| 950 | start, start + ram_size - 1, |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 951 | locked_page, op); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 952 | disk_num_bytes -= cur_alloc_size; |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 953 | num_bytes -= cur_alloc_size; |
| 954 | alloc_hint = ins.objectid + ins.offset; |
| 955 | start += cur_alloc_size; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 956 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 957 | ret = 0; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 958 | out: |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 959 | btrfs_end_transaction(trans, root); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 960 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 961 | return ret; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 962 | out_unlock: |
| 963 | extent_clear_unlock_delalloc(inode, |
| 964 | &BTRFS_I(inode)->io_tree, |
Josef Bacik | beb42dd | 2012-05-30 15:35:17 -0400 | [diff] [blame] | 965 | start, end, locked_page, |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 966 | EXTENT_CLEAR_UNLOCK_PAGE | |
| 967 | EXTENT_CLEAR_UNLOCK | |
| 968 | EXTENT_CLEAR_DELALLOC | |
| 969 | EXTENT_CLEAR_DIRTY | |
| 970 | EXTENT_SET_WRITEBACK | |
| 971 | EXTENT_END_WRITEBACK); |
| 972 | |
| 973 | goto out; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 974 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 975 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 976 | /* |
| 977 | * work queue call back to started compression on a file and pages |
| 978 | */ |
| 979 | static noinline void async_cow_start(struct btrfs_work *work) |
| 980 | { |
| 981 | struct async_cow *async_cow; |
| 982 | int num_added = 0; |
| 983 | async_cow = container_of(work, struct async_cow, work); |
| 984 | |
| 985 | compress_file_range(async_cow->inode, async_cow->locked_page, |
| 986 | async_cow->start, async_cow->end, async_cow, |
| 987 | &num_added); |
Josef Bacik | 8180ef8 | 2012-06-08 15:16:12 -0400 | [diff] [blame] | 988 | if (num_added == 0) { |
Josef Bacik | cb77fcd | 2012-06-15 12:19:48 -0600 | [diff] [blame] | 989 | btrfs_add_delayed_iput(async_cow->inode); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 990 | async_cow->inode = NULL; |
Josef Bacik | 8180ef8 | 2012-06-08 15:16:12 -0400 | [diff] [blame] | 991 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 992 | } |
| 993 | |
| 994 | /* |
| 995 | * work queue call back to submit previously compressed pages |
| 996 | */ |
| 997 | static noinline void async_cow_submit(struct btrfs_work *work) |
| 998 | { |
| 999 | struct async_cow *async_cow; |
| 1000 | struct btrfs_root *root; |
| 1001 | unsigned long nr_pages; |
| 1002 | |
| 1003 | async_cow = container_of(work, struct async_cow, work); |
| 1004 | |
| 1005 | root = async_cow->root; |
| 1006 | nr_pages = (async_cow->end - async_cow->start + PAGE_CACHE_SIZE) >> |
| 1007 | PAGE_CACHE_SHIFT; |
| 1008 | |
Josef Bacik | 66657b3 | 2012-08-01 15:36:24 -0400 | [diff] [blame] | 1009 | if (atomic_sub_return(nr_pages, &root->fs_info->async_delalloc_pages) < |
Liu Bo | 287082b | 2012-06-28 04:02:24 -0600 | [diff] [blame] | 1010 | 5 * 1024 * 1024 && |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1011 | waitqueue_active(&root->fs_info->async_submit_wait)) |
| 1012 | wake_up(&root->fs_info->async_submit_wait); |
| 1013 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1014 | if (async_cow->inode) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1015 | submit_compressed_extents(async_cow->inode, async_cow); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1016 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1017 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1018 | static noinline void async_cow_free(struct btrfs_work *work) |
| 1019 | { |
| 1020 | struct async_cow *async_cow; |
| 1021 | async_cow = container_of(work, struct async_cow, work); |
Josef Bacik | 8180ef8 | 2012-06-08 15:16:12 -0400 | [diff] [blame] | 1022 | if (async_cow->inode) |
Josef Bacik | cb77fcd | 2012-06-15 12:19:48 -0600 | [diff] [blame] | 1023 | btrfs_add_delayed_iput(async_cow->inode); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1024 | kfree(async_cow); |
| 1025 | } |
| 1026 | |
| 1027 | static int cow_file_range_async(struct inode *inode, struct page *locked_page, |
| 1028 | u64 start, u64 end, int *page_started, |
| 1029 | unsigned long *nr_written) |
| 1030 | { |
| 1031 | struct async_cow *async_cow; |
| 1032 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1033 | unsigned long nr_pages; |
| 1034 | u64 cur_end; |
Liu Bo | 287082b | 2012-06-28 04:02:24 -0600 | [diff] [blame] | 1035 | int limit = 10 * 1024 * 1024; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1036 | |
Chris Mason | a3429ab | 2009-10-08 12:30:20 -0400 | [diff] [blame] | 1037 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED, |
| 1038 | 1, 0, NULL, GFP_NOFS); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1039 | while (start < end) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1040 | async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1041 | BUG_ON(!async_cow); /* -ENOMEM */ |
Josef Bacik | 8180ef8 | 2012-06-08 15:16:12 -0400 | [diff] [blame] | 1042 | async_cow->inode = igrab(inode); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1043 | async_cow->root = root; |
| 1044 | async_cow->locked_page = locked_page; |
| 1045 | async_cow->start = start; |
| 1046 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 1047 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1048 | cur_end = end; |
| 1049 | else |
| 1050 | cur_end = min(end, start + 512 * 1024 - 1); |
| 1051 | |
| 1052 | async_cow->end = cur_end; |
| 1053 | INIT_LIST_HEAD(&async_cow->extents); |
| 1054 | |
| 1055 | async_cow->work.func = async_cow_start; |
| 1056 | async_cow->work.ordered_func = async_cow_submit; |
| 1057 | async_cow->work.ordered_free = async_cow_free; |
| 1058 | async_cow->work.flags = 0; |
| 1059 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1060 | nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >> |
| 1061 | PAGE_CACHE_SHIFT; |
| 1062 | atomic_add(nr_pages, &root->fs_info->async_delalloc_pages); |
| 1063 | |
| 1064 | btrfs_queue_worker(&root->fs_info->delalloc_workers, |
| 1065 | &async_cow->work); |
| 1066 | |
| 1067 | if (atomic_read(&root->fs_info->async_delalloc_pages) > limit) { |
| 1068 | wait_event(root->fs_info->async_submit_wait, |
| 1069 | (atomic_read(&root->fs_info->async_delalloc_pages) < |
| 1070 | limit)); |
| 1071 | } |
| 1072 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1073 | while (atomic_read(&root->fs_info->async_submit_draining) && |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1074 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
| 1075 | wait_event(root->fs_info->async_submit_wait, |
| 1076 | (atomic_read(&root->fs_info->async_delalloc_pages) == |
| 1077 | 0)); |
| 1078 | } |
| 1079 | |
| 1080 | *nr_written += nr_pages; |
| 1081 | start = cur_end + 1; |
| 1082 | } |
| 1083 | *page_started = 1; |
| 1084 | return 0; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1085 | } |
| 1086 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1087 | static noinline int csum_exist_in_range(struct btrfs_root *root, |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1088 | u64 bytenr, u64 num_bytes) |
| 1089 | { |
| 1090 | int ret; |
| 1091 | struct btrfs_ordered_sum *sums; |
| 1092 | LIST_HEAD(list); |
| 1093 | |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 1094 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, bytenr, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1095 | bytenr + num_bytes - 1, &list, 0); |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1096 | if (ret == 0 && list_empty(&list)) |
| 1097 | return 0; |
| 1098 | |
| 1099 | while (!list_empty(&list)) { |
| 1100 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); |
| 1101 | list_del(&sums->list); |
| 1102 | kfree(sums); |
| 1103 | } |
| 1104 | return 1; |
| 1105 | } |
| 1106 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1107 | /* |
| 1108 | * when nowcow writeback call back. This checks for snapshots or COW copies |
| 1109 | * of the extents that exist in the file, and COWs the file as required. |
| 1110 | * |
| 1111 | * If no cow copies or snapshots exist, we write directly to the existing |
| 1112 | * blocks on disk |
| 1113 | */ |
Chris Mason | 7f366cf | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1114 | static noinline int run_delalloc_nocow(struct inode *inode, |
| 1115 | struct page *locked_page, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1116 | u64 start, u64 end, int *page_started, int force, |
| 1117 | unsigned long *nr_written) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1118 | { |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1119 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1120 | struct btrfs_trans_handle *trans; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1121 | struct extent_buffer *leaf; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1122 | struct btrfs_path *path; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1123 | struct btrfs_file_extent_item *fi; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1124 | struct btrfs_key found_key; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1125 | u64 cow_start; |
| 1126 | u64 cur_offset; |
| 1127 | u64 extent_end; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1128 | u64 extent_offset; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1129 | u64 disk_bytenr; |
| 1130 | u64 num_bytes; |
| 1131 | int extent_type; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1132 | int ret, err; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1133 | int type; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1134 | int nocow; |
| 1135 | int check_prev = 1; |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1136 | bool nolock; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1137 | u64 ino = btrfs_ino(inode); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1138 | |
| 1139 | path = btrfs_alloc_path(); |
Josef Bacik | 17ca04a | 2012-05-31 15:58:55 -0400 | [diff] [blame] | 1140 | if (!path) { |
| 1141 | extent_clear_unlock_delalloc(inode, |
| 1142 | &BTRFS_I(inode)->io_tree, |
| 1143 | start, end, locked_page, |
| 1144 | EXTENT_CLEAR_UNLOCK_PAGE | |
| 1145 | EXTENT_CLEAR_UNLOCK | |
| 1146 | EXTENT_CLEAR_DELALLOC | |
| 1147 | EXTENT_CLEAR_DIRTY | |
| 1148 | EXTENT_SET_WRITEBACK | |
| 1149 | EXTENT_END_WRITEBACK); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 1150 | return -ENOMEM; |
Josef Bacik | 17ca04a | 2012-05-31 15:58:55 -0400 | [diff] [blame] | 1151 | } |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1152 | |
Liu Bo | 83eea1f | 2012-07-10 05:28:39 -0600 | [diff] [blame] | 1153 | nolock = btrfs_is_free_space_inode(inode); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1154 | |
| 1155 | if (nolock) |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1156 | trans = btrfs_join_transaction_nolock(root); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1157 | else |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1158 | trans = btrfs_join_transaction(root); |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 1159 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1160 | if (IS_ERR(trans)) { |
Josef Bacik | 17ca04a | 2012-05-31 15:58:55 -0400 | [diff] [blame] | 1161 | extent_clear_unlock_delalloc(inode, |
| 1162 | &BTRFS_I(inode)->io_tree, |
| 1163 | start, end, locked_page, |
| 1164 | EXTENT_CLEAR_UNLOCK_PAGE | |
| 1165 | EXTENT_CLEAR_UNLOCK | |
| 1166 | EXTENT_CLEAR_DELALLOC | |
| 1167 | EXTENT_CLEAR_DIRTY | |
| 1168 | EXTENT_SET_WRITEBACK | |
| 1169 | EXTENT_END_WRITEBACK); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1170 | btrfs_free_path(path); |
| 1171 | return PTR_ERR(trans); |
| 1172 | } |
| 1173 | |
Josef Bacik | 74b2107 | 2011-04-13 12:02:53 -0400 | [diff] [blame] | 1174 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1175 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1176 | cow_start = (u64)-1; |
| 1177 | cur_offset = start; |
| 1178 | while (1) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1179 | ret = btrfs_lookup_file_extent(trans, root, path, ino, |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1180 | cur_offset, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1181 | if (ret < 0) { |
| 1182 | btrfs_abort_transaction(trans, root, ret); |
| 1183 | goto error; |
| 1184 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1185 | if (ret > 0 && path->slots[0] > 0 && check_prev) { |
| 1186 | leaf = path->nodes[0]; |
| 1187 | btrfs_item_key_to_cpu(leaf, &found_key, |
| 1188 | path->slots[0] - 1); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1189 | if (found_key.objectid == ino && |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1190 | found_key.type == BTRFS_EXTENT_DATA_KEY) |
| 1191 | path->slots[0]--; |
| 1192 | } |
| 1193 | check_prev = 0; |
| 1194 | next_slot: |
| 1195 | leaf = path->nodes[0]; |
| 1196 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 1197 | ret = btrfs_next_leaf(root, path); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1198 | if (ret < 0) { |
| 1199 | btrfs_abort_transaction(trans, root, ret); |
| 1200 | goto error; |
| 1201 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1202 | if (ret > 0) |
| 1203 | break; |
| 1204 | leaf = path->nodes[0]; |
| 1205 | } |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1206 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1207 | nocow = 0; |
| 1208 | disk_bytenr = 0; |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1209 | num_bytes = 0; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1210 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1211 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1212 | if (found_key.objectid > ino || |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1213 | found_key.type > BTRFS_EXTENT_DATA_KEY || |
| 1214 | found_key.offset > end) |
| 1215 | break; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1216 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1217 | if (found_key.offset > cur_offset) { |
| 1218 | extent_end = found_key.offset; |
Chris Mason | e9061e2 | 2009-10-09 09:57:45 -0400 | [diff] [blame] | 1219 | extent_type = 0; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1220 | goto out_check; |
| 1221 | } |
Chris Mason | c31f883 | 2008-01-08 15:46:31 -0500 | [diff] [blame] | 1222 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1223 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1224 | struct btrfs_file_extent_item); |
| 1225 | extent_type = btrfs_file_extent_type(leaf, fi); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1226 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1227 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
| 1228 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1229 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1230 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1231 | extent_end = found_key.offset + |
| 1232 | btrfs_file_extent_num_bytes(leaf, fi); |
| 1233 | if (extent_end <= start) { |
| 1234 | path->slots[0]++; |
| 1235 | goto next_slot; |
| 1236 | } |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1237 | if (disk_bytenr == 0) |
| 1238 | goto out_check; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1239 | if (btrfs_file_extent_compression(leaf, fi) || |
| 1240 | btrfs_file_extent_encryption(leaf, fi) || |
| 1241 | btrfs_file_extent_other_encoding(leaf, fi)) |
| 1242 | goto out_check; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1243 | if (extent_type == BTRFS_FILE_EXTENT_REG && !force) |
| 1244 | goto out_check; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 1245 | if (btrfs_extent_readonly(root, disk_bytenr)) |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1246 | goto out_check; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1247 | if (btrfs_cross_ref_exist(trans, root, ino, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1248 | found_key.offset - |
| 1249 | extent_offset, disk_bytenr)) |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1250 | goto out_check; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1251 | disk_bytenr += extent_offset; |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1252 | disk_bytenr += cur_offset - found_key.offset; |
| 1253 | num_bytes = min(end + 1, extent_end) - cur_offset; |
| 1254 | /* |
| 1255 | * force cow if csum exists in the range. |
| 1256 | * this ensure that csum for a given extent are |
| 1257 | * either valid or do not exist. |
| 1258 | */ |
| 1259 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) |
| 1260 | goto out_check; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1261 | nocow = 1; |
| 1262 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
| 1263 | extent_end = found_key.offset + |
| 1264 | btrfs_file_extent_inline_len(leaf, fi); |
| 1265 | extent_end = ALIGN(extent_end, root->sectorsize); |
| 1266 | } else { |
| 1267 | BUG_ON(1); |
| 1268 | } |
| 1269 | out_check: |
| 1270 | if (extent_end <= start) { |
| 1271 | path->slots[0]++; |
| 1272 | goto next_slot; |
| 1273 | } |
| 1274 | if (!nocow) { |
| 1275 | if (cow_start == (u64)-1) |
| 1276 | cow_start = cur_offset; |
| 1277 | cur_offset = extent_end; |
| 1278 | if (cur_offset > end) |
| 1279 | break; |
| 1280 | path->slots[0]++; |
| 1281 | goto next_slot; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1282 | } |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1283 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1284 | btrfs_release_path(path); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1285 | if (cow_start != (u64)-1) { |
| 1286 | ret = cow_file_range(inode, locked_page, cow_start, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1287 | found_key.offset - 1, page_started, |
| 1288 | nr_written, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1289 | if (ret) { |
| 1290 | btrfs_abort_transaction(trans, root, ret); |
| 1291 | goto error; |
| 1292 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1293 | cow_start = (u64)-1; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1294 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1295 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1296 | if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
| 1297 | struct extent_map *em; |
| 1298 | struct extent_map_tree *em_tree; |
| 1299 | em_tree = &BTRFS_I(inode)->extent_tree; |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 1300 | em = alloc_extent_map(); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1301 | BUG_ON(!em); /* -ENOMEM */ |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1302 | em->start = cur_offset; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 1303 | em->orig_start = em->start; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1304 | em->len = num_bytes; |
| 1305 | em->block_len = num_bytes; |
| 1306 | em->block_start = disk_bytenr; |
| 1307 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
| 1308 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
Liu Bo | 4e2f84e | 2012-08-27 10:52:20 -0600 | [diff] [blame] | 1309 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1310 | while (1) { |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 1311 | write_lock(&em_tree->lock); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1312 | ret = add_extent_mapping(em_tree, em); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 1313 | write_unlock(&em_tree->lock); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1314 | if (ret != -EEXIST) { |
| 1315 | free_extent_map(em); |
| 1316 | break; |
| 1317 | } |
| 1318 | btrfs_drop_extent_cache(inode, em->start, |
| 1319 | em->start + em->len - 1, 0); |
| 1320 | } |
| 1321 | type = BTRFS_ORDERED_PREALLOC; |
| 1322 | } else { |
| 1323 | type = BTRFS_ORDERED_NOCOW; |
| 1324 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1325 | |
| 1326 | ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1327 | num_bytes, num_bytes, type); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1328 | BUG_ON(ret); /* -ENOMEM */ |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1329 | |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1330 | if (root->root_key.objectid == |
| 1331 | BTRFS_DATA_RELOC_TREE_OBJECTID) { |
| 1332 | ret = btrfs_reloc_clone_csums(inode, cur_offset, |
| 1333 | num_bytes); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1334 | if (ret) { |
| 1335 | btrfs_abort_transaction(trans, root, ret); |
| 1336 | goto error; |
| 1337 | } |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1338 | } |
| 1339 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1340 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 1341 | cur_offset, cur_offset + num_bytes - 1, |
| 1342 | locked_page, EXTENT_CLEAR_UNLOCK_PAGE | |
| 1343 | EXTENT_CLEAR_UNLOCK | EXTENT_CLEAR_DELALLOC | |
| 1344 | EXTENT_SET_PRIVATE2); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1345 | cur_offset = extent_end; |
| 1346 | if (cur_offset > end) |
| 1347 | break; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1348 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1349 | btrfs_release_path(path); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1350 | |
Josef Bacik | 17ca04a | 2012-05-31 15:58:55 -0400 | [diff] [blame] | 1351 | if (cur_offset <= end && cow_start == (u64)-1) { |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1352 | cow_start = cur_offset; |
Josef Bacik | 17ca04a | 2012-05-31 15:58:55 -0400 | [diff] [blame] | 1353 | cur_offset = end; |
| 1354 | } |
| 1355 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1356 | if (cow_start != (u64)-1) { |
| 1357 | ret = cow_file_range(inode, locked_page, cow_start, end, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1358 | page_started, nr_written, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1359 | if (ret) { |
| 1360 | btrfs_abort_transaction(trans, root, ret); |
| 1361 | goto error; |
| 1362 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1363 | } |
| 1364 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1365 | error: |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1366 | if (nolock) { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1367 | err = btrfs_end_transaction_nolock(trans, root); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1368 | } else { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1369 | err = btrfs_end_transaction(trans, root); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1370 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1371 | if (!ret) |
| 1372 | ret = err; |
| 1373 | |
Josef Bacik | 17ca04a | 2012-05-31 15:58:55 -0400 | [diff] [blame] | 1374 | if (ret && cur_offset < end) |
| 1375 | extent_clear_unlock_delalloc(inode, |
| 1376 | &BTRFS_I(inode)->io_tree, |
| 1377 | cur_offset, end, locked_page, |
| 1378 | EXTENT_CLEAR_UNLOCK_PAGE | |
| 1379 | EXTENT_CLEAR_UNLOCK | |
| 1380 | EXTENT_CLEAR_DELALLOC | |
| 1381 | EXTENT_CLEAR_DIRTY | |
| 1382 | EXTENT_SET_WRITEBACK | |
| 1383 | EXTENT_END_WRITEBACK); |
| 1384 | |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1385 | btrfs_free_path(path); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1386 | return ret; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1387 | } |
| 1388 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1389 | /* |
| 1390 | * extent_io.c call back to do delayed allocation processing |
| 1391 | */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1392 | static int run_delalloc_range(struct inode *inode, struct page *locked_page, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1393 | u64 start, u64 end, int *page_started, |
| 1394 | unsigned long *nr_written) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1395 | { |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1396 | int ret; |
Chris Mason | 7f366cf | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1397 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1398 | |
Josef Bacik | 7ddf5a4 | 2012-06-08 15:26:47 -0400 | [diff] [blame] | 1399 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1400 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1401 | page_started, 1, nr_written); |
Josef Bacik | 7ddf5a4 | 2012-06-08 15:26:47 -0400 | [diff] [blame] | 1402 | } else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC) { |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1403 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1404 | page_started, 0, nr_written); |
Josef Bacik | 7ddf5a4 | 2012-06-08 15:26:47 -0400 | [diff] [blame] | 1405 | } else if (!btrfs_test_opt(root, COMPRESS) && |
| 1406 | !(BTRFS_I(inode)->force_compress) && |
| 1407 | !(BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS)) { |
Chris Mason | 7f366cf | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1408 | ret = cow_file_range(inode, locked_page, start, end, |
| 1409 | page_started, nr_written, 1); |
Josef Bacik | 7ddf5a4 | 2012-06-08 15:26:47 -0400 | [diff] [blame] | 1410 | } else { |
| 1411 | set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, |
| 1412 | &BTRFS_I(inode)->runtime_flags); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1413 | ret = cow_file_range_async(inode, locked_page, start, end, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1414 | page_started, nr_written); |
Josef Bacik | 7ddf5a4 | 2012-06-08 15:26:47 -0400 | [diff] [blame] | 1415 | } |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1416 | return ret; |
| 1417 | } |
| 1418 | |
Jeff Mahoney | 1bf8504 | 2011-07-21 16:56:09 +0000 | [diff] [blame] | 1419 | static void btrfs_split_extent_hook(struct inode *inode, |
| 1420 | struct extent_state *orig, u64 split) |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1421 | { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1422 | /* not delalloc, ignore it */ |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1423 | if (!(orig->state & EXTENT_DELALLOC)) |
Jeff Mahoney | 1bf8504 | 2011-07-21 16:56:09 +0000 | [diff] [blame] | 1424 | return; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1425 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1426 | spin_lock(&BTRFS_I(inode)->lock); |
| 1427 | BTRFS_I(inode)->outstanding_extents++; |
| 1428 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1429 | } |
| 1430 | |
| 1431 | /* |
| 1432 | * extent_io.c merge_extent_hook, used to track merged delayed allocation |
| 1433 | * extents so we can keep track of new extents that are just merged onto old |
| 1434 | * extents, such as when we are doing sequential writes, so we can properly |
| 1435 | * account for the metadata space we'll need. |
| 1436 | */ |
Jeff Mahoney | 1bf8504 | 2011-07-21 16:56:09 +0000 | [diff] [blame] | 1437 | static void btrfs_merge_extent_hook(struct inode *inode, |
| 1438 | struct extent_state *new, |
| 1439 | struct extent_state *other) |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1440 | { |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1441 | /* not delalloc, ignore it */ |
| 1442 | if (!(other->state & EXTENT_DELALLOC)) |
Jeff Mahoney | 1bf8504 | 2011-07-21 16:56:09 +0000 | [diff] [blame] | 1443 | return; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1444 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1445 | spin_lock(&BTRFS_I(inode)->lock); |
| 1446 | BTRFS_I(inode)->outstanding_extents--; |
| 1447 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1448 | } |
| 1449 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1450 | /* |
| 1451 | * extent_io.c set_bit_hook, used to track delayed allocation |
| 1452 | * bytes in this file, and to maintain the list of inodes that |
| 1453 | * have pending delalloc work to be done. |
| 1454 | */ |
Jeff Mahoney | 1bf8504 | 2011-07-21 16:56:09 +0000 | [diff] [blame] | 1455 | static void btrfs_set_bit_hook(struct inode *inode, |
| 1456 | struct extent_state *state, int *bits) |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1457 | { |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1458 | |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1459 | /* |
| 1460 | * set_bit and clear bit hooks normally require _irqsave/restore |
Sergei Trofimovich | 27160b6 | 2011-05-20 20:20:32 +0000 | [diff] [blame] | 1461 | * but in this case, we are only testing for the DELALLOC |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1462 | * bit, which is only set or cleared with irqs on |
| 1463 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1464 | if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1465 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1466 | u64 len = state->end + 1 - state->start; |
Liu Bo | 83eea1f | 2012-07-10 05:28:39 -0600 | [diff] [blame] | 1467 | bool do_list = !btrfs_is_free_space_inode(inode); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1468 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1469 | if (*bits & EXTENT_FIRST_DELALLOC) { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1470 | *bits &= ~EXTENT_FIRST_DELALLOC; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1471 | } else { |
| 1472 | spin_lock(&BTRFS_I(inode)->lock); |
| 1473 | BTRFS_I(inode)->outstanding_extents++; |
| 1474 | spin_unlock(&BTRFS_I(inode)->lock); |
| 1475 | } |
Josef Bacik | 287a0ab | 2010-03-19 18:07:23 +0000 | [diff] [blame] | 1476 | |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1477 | spin_lock(&root->fs_info->delalloc_lock); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1478 | BTRFS_I(inode)->delalloc_bytes += len; |
| 1479 | root->fs_info->delalloc_bytes += len; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1480 | if (do_list && list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1481 | list_add_tail(&BTRFS_I(inode)->delalloc_inodes, |
| 1482 | &root->fs_info->delalloc_inodes); |
| 1483 | } |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1484 | spin_unlock(&root->fs_info->delalloc_lock); |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1485 | } |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1486 | } |
| 1487 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1488 | /* |
| 1489 | * extent_io.c clear_bit_hook, see set_bit_hook for why |
| 1490 | */ |
Jeff Mahoney | 1bf8504 | 2011-07-21 16:56:09 +0000 | [diff] [blame] | 1491 | static void btrfs_clear_bit_hook(struct inode *inode, |
| 1492 | struct extent_state *state, int *bits) |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1493 | { |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1494 | /* |
| 1495 | * set_bit and clear bit hooks normally require _irqsave/restore |
Sergei Trofimovich | 27160b6 | 2011-05-20 20:20:32 +0000 | [diff] [blame] | 1496 | * but in this case, we are only testing for the DELALLOC |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1497 | * bit, which is only set or cleared with irqs on |
| 1498 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1499 | if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1500 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1501 | u64 len = state->end + 1 - state->start; |
Liu Bo | 83eea1f | 2012-07-10 05:28:39 -0600 | [diff] [blame] | 1502 | bool do_list = !btrfs_is_free_space_inode(inode); |
Chris Mason | bcbfce8 | 2008-04-22 13:26:47 -0400 | [diff] [blame] | 1503 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1504 | if (*bits & EXTENT_FIRST_DELALLOC) { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1505 | *bits &= ~EXTENT_FIRST_DELALLOC; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1506 | } else if (!(*bits & EXTENT_DO_ACCOUNTING)) { |
| 1507 | spin_lock(&BTRFS_I(inode)->lock); |
| 1508 | BTRFS_I(inode)->outstanding_extents--; |
| 1509 | spin_unlock(&BTRFS_I(inode)->lock); |
| 1510 | } |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1511 | |
| 1512 | if (*bits & EXTENT_DO_ACCOUNTING) |
| 1513 | btrfs_delalloc_release_metadata(inode, len); |
| 1514 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1515 | if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID |
| 1516 | && do_list) |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1517 | btrfs_free_reserved_data_space(inode, len); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1518 | |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1519 | spin_lock(&root->fs_info->delalloc_lock); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1520 | root->fs_info->delalloc_bytes -= len; |
| 1521 | BTRFS_I(inode)->delalloc_bytes -= len; |
| 1522 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1523 | if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 && |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1524 | !list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
| 1525 | list_del_init(&BTRFS_I(inode)->delalloc_inodes); |
| 1526 | } |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1527 | spin_unlock(&root->fs_info->delalloc_lock); |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1528 | } |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1529 | } |
| 1530 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1531 | /* |
| 1532 | * extent_io.c merge_bio_hook, this must check the chunk tree to make sure |
| 1533 | * we don't create bios that span stripes or chunks |
| 1534 | */ |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1535 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1536 | size_t size, struct bio *bio, |
| 1537 | unsigned long bio_flags) |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1538 | { |
| 1539 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; |
| 1540 | struct btrfs_mapping_tree *map_tree; |
Chris Mason | a62b940 | 2008-10-03 16:31:08 -0400 | [diff] [blame] | 1541 | u64 logical = (u64)bio->bi_sector << 9; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1542 | u64 length = 0; |
| 1543 | u64 map_length; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1544 | int ret; |
| 1545 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1546 | if (bio_flags & EXTENT_BIO_COMPRESSED) |
| 1547 | return 0; |
| 1548 | |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 1549 | length = bio->bi_size; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1550 | map_tree = &root->fs_info->mapping_tree; |
| 1551 | map_length = length; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1552 | ret = btrfs_map_block(map_tree, READ, logical, |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1553 | &map_length, NULL, 0); |
Jeff Mahoney | 3444a97 | 2011-10-03 23:23:13 -0400 | [diff] [blame] | 1554 | /* Will always return 0 or 1 with map_multi == NULL */ |
| 1555 | BUG_ON(ret < 0); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1556 | if (map_length < length + size) |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1557 | return 1; |
Jeff Mahoney | 3444a97 | 2011-10-03 23:23:13 -0400 | [diff] [blame] | 1558 | return 0; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1559 | } |
| 1560 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1561 | /* |
| 1562 | * in order to insert checksums into the metadata in large chunks, |
| 1563 | * we wait until bio submission time. All the pages in the bio are |
| 1564 | * checksummed and sums are attached onto the ordered extent record. |
| 1565 | * |
| 1566 | * At IO completion time the cums attached on the ordered extent record |
| 1567 | * are inserted into the btree |
| 1568 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1569 | static int __btrfs_submit_bio_start(struct inode *inode, int rw, |
| 1570 | struct bio *bio, int mirror_num, |
Chris Mason | eaf25d9 | 2010-05-25 09:48:28 -0400 | [diff] [blame] | 1571 | unsigned long bio_flags, |
| 1572 | u64 bio_offset) |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1573 | { |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1574 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1575 | int ret = 0; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 1576 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1577 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1578 | BUG_ON(ret); /* -ENOMEM */ |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 1579 | return 0; |
| 1580 | } |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 1581 | |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 1582 | /* |
| 1583 | * in order to insert checksums into the metadata in large chunks, |
| 1584 | * we wait until bio submission time. All the pages in the bio are |
| 1585 | * checksummed and sums are attached onto the ordered extent record. |
| 1586 | * |
| 1587 | * At IO completion time the cums attached on the ordered extent record |
| 1588 | * are inserted into the btree |
| 1589 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1590 | static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
Chris Mason | eaf25d9 | 2010-05-25 09:48:28 -0400 | [diff] [blame] | 1591 | int mirror_num, unsigned long bio_flags, |
| 1592 | u64 bio_offset) |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 1593 | { |
| 1594 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 1595 | return btrfs_map_bio(root, rw, bio, mirror_num, 1); |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1596 | } |
| 1597 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1598 | /* |
Chris Mason | cad321a | 2008-12-17 14:51:42 -0500 | [diff] [blame] | 1599 | * extent_io.c submission hook. This does the right thing for csum calculation |
| 1600 | * on write, or reading the csums from the tree before a read |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1601 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1602 | static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
Chris Mason | eaf25d9 | 2010-05-25 09:48:28 -0400 | [diff] [blame] | 1603 | int mirror_num, unsigned long bio_flags, |
| 1604 | u64 bio_offset) |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1605 | { |
| 1606 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1607 | int ret = 0; |
Chris Mason | 19b9bdb | 2008-10-30 14:23:13 -0400 | [diff] [blame] | 1608 | int skip_sum; |
Jeff Mahoney | 0417341 | 2011-10-03 23:23:12 -0400 | [diff] [blame] | 1609 | int metadata = 0; |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1610 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 1611 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
Chris Mason | cad321a | 2008-12-17 14:51:42 -0500 | [diff] [blame] | 1612 | |
Liu Bo | 83eea1f | 2012-07-10 05:28:39 -0600 | [diff] [blame] | 1613 | if (btrfs_is_free_space_inode(inode)) |
Jeff Mahoney | 0417341 | 2011-10-03 23:23:12 -0400 | [diff] [blame] | 1614 | metadata = 2; |
| 1615 | |
Christoph Hellwig | 7b6d91d | 2010-08-07 18:20:39 +0200 | [diff] [blame] | 1616 | if (!(rw & REQ_WRITE)) { |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 1617 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, metadata); |
| 1618 | if (ret) |
| 1619 | return ret; |
| 1620 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1621 | if (bio_flags & EXTENT_BIO_COMPRESSED) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1622 | return btrfs_submit_compressed_read(inode, bio, |
| 1623 | mirror_num, bio_flags); |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 1624 | } else if (!skip_sum) { |
| 1625 | ret = btrfs_lookup_bio_sums(root, inode, bio, NULL); |
| 1626 | if (ret) |
| 1627 | return ret; |
| 1628 | } |
Chris Mason | 4d1b5fb | 2008-08-20 09:44:52 -0400 | [diff] [blame] | 1629 | goto mapit; |
Chris Mason | 19b9bdb | 2008-10-30 14:23:13 -0400 | [diff] [blame] | 1630 | } else if (!skip_sum) { |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1631 | /* csum items have already been cloned */ |
| 1632 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
| 1633 | goto mapit; |
Chris Mason | 19b9bdb | 2008-10-30 14:23:13 -0400 | [diff] [blame] | 1634 | /* we're doing a write, do the async checksumming */ |
| 1635 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1636 | inode, rw, bio, mirror_num, |
Chris Mason | eaf25d9 | 2010-05-25 09:48:28 -0400 | [diff] [blame] | 1637 | bio_flags, bio_offset, |
| 1638 | __btrfs_submit_bio_start, |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 1639 | __btrfs_submit_bio_done); |
Chris Mason | 19b9bdb | 2008-10-30 14:23:13 -0400 | [diff] [blame] | 1640 | } |
| 1641 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1642 | mapit: |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 1643 | return btrfs_map_bio(root, rw, bio, mirror_num, 0); |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1644 | } |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 1645 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1646 | /* |
| 1647 | * given a list of ordered sums record them in the inode. This happens |
| 1648 | * at IO completion time based on sums calculated at bio submission time. |
| 1649 | */ |
Chris Mason | ba1da2f | 2008-07-17 12:54:15 -0400 | [diff] [blame] | 1650 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1651 | struct inode *inode, u64 file_offset, |
| 1652 | struct list_head *list) |
| 1653 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1654 | struct btrfs_ordered_sum *sum; |
| 1655 | |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 1656 | list_for_each_entry(sum, list, list) { |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1657 | btrfs_csum_file_blocks(trans, |
| 1658 | BTRFS_I(inode)->root->fs_info->csum_root, sum); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1659 | } |
| 1660 | return 0; |
| 1661 | } |
| 1662 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1663 | int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, |
| 1664 | struct extent_state **cached_state) |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1665 | { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1666 | if ((end & (PAGE_CACHE_SIZE - 1)) == 0) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1667 | WARN_ON(1); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1668 | return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end, |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1669 | cached_state, GFP_NOFS); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1670 | } |
| 1671 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1672 | /* see btrfs_writepage_start_hook for details on why this is required */ |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1673 | struct btrfs_writepage_fixup { |
| 1674 | struct page *page; |
| 1675 | struct btrfs_work work; |
| 1676 | }; |
| 1677 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1678 | static void btrfs_writepage_fixup_worker(struct btrfs_work *work) |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1679 | { |
| 1680 | struct btrfs_writepage_fixup *fixup; |
| 1681 | struct btrfs_ordered_extent *ordered; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1682 | struct extent_state *cached_state = NULL; |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1683 | struct page *page; |
| 1684 | struct inode *inode; |
| 1685 | u64 page_start; |
| 1686 | u64 page_end; |
Jeff Mahoney | 87826df | 2012-02-15 16:23:57 +0100 | [diff] [blame] | 1687 | int ret; |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1688 | |
| 1689 | fixup = container_of(work, struct btrfs_writepage_fixup, work); |
| 1690 | page = fixup->page; |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1691 | again: |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1692 | lock_page(page); |
| 1693 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { |
| 1694 | ClearPageChecked(page); |
| 1695 | goto out_page; |
| 1696 | } |
| 1697 | |
| 1698 | inode = page->mapping->host; |
| 1699 | page_start = page_offset(page); |
| 1700 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; |
| 1701 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1702 | lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end, 0, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 1703 | &cached_state); |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1704 | |
| 1705 | /* already ordered? We're done */ |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 1706 | if (PagePrivate2(page)) |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1707 | goto out; |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1708 | |
| 1709 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 1710 | if (ordered) { |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1711 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, |
| 1712 | page_end, &cached_state, GFP_NOFS); |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1713 | unlock_page(page); |
| 1714 | btrfs_start_ordered_extent(inode, ordered, 1); |
Jeff Mahoney | 87826df | 2012-02-15 16:23:57 +0100 | [diff] [blame] | 1715 | btrfs_put_ordered_extent(ordered); |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1716 | goto again; |
| 1717 | } |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1718 | |
Jeff Mahoney | 87826df | 2012-02-15 16:23:57 +0100 | [diff] [blame] | 1719 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
| 1720 | if (ret) { |
| 1721 | mapping_set_error(page->mapping, ret); |
| 1722 | end_extent_writepage(page, ret, page_start, page_end); |
| 1723 | ClearPageChecked(page); |
| 1724 | goto out; |
| 1725 | } |
| 1726 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1727 | btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state); |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1728 | ClearPageChecked(page); |
Jeff Mahoney | 87826df | 2012-02-15 16:23:57 +0100 | [diff] [blame] | 1729 | set_page_dirty(page); |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1730 | out: |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1731 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end, |
| 1732 | &cached_state, GFP_NOFS); |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1733 | out_page: |
| 1734 | unlock_page(page); |
| 1735 | page_cache_release(page); |
Miao Xie | b897abe | 2011-01-26 16:19:22 +0800 | [diff] [blame] | 1736 | kfree(fixup); |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1737 | } |
| 1738 | |
| 1739 | /* |
| 1740 | * There are a few paths in the higher layers of the kernel that directly |
| 1741 | * set the page dirty bit without asking the filesystem if it is a |
| 1742 | * good idea. This causes problems because we want to make sure COW |
| 1743 | * properly happens and the data=ordered rules are followed. |
| 1744 | * |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1745 | * In our case any range that doesn't have the ORDERED bit set |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1746 | * hasn't been properly setup for IO. We kick off an async process |
| 1747 | * to fix it up. The async helper will wait for ordered extents, set |
| 1748 | * the delalloc bit and make it safe to write the page. |
| 1749 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1750 | static int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end) |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1751 | { |
| 1752 | struct inode *inode = page->mapping->host; |
| 1753 | struct btrfs_writepage_fixup *fixup; |
| 1754 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1755 | |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 1756 | /* this page is properly in the ordered list */ |
| 1757 | if (TestClearPagePrivate2(page)) |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1758 | return 0; |
| 1759 | |
| 1760 | if (PageChecked(page)) |
| 1761 | return -EAGAIN; |
| 1762 | |
| 1763 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); |
| 1764 | if (!fixup) |
| 1765 | return -EAGAIN; |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 1766 | |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1767 | SetPageChecked(page); |
| 1768 | page_cache_get(page); |
| 1769 | fixup->work.func = btrfs_writepage_fixup_worker; |
| 1770 | fixup->page = page; |
| 1771 | btrfs_queue_worker(&root->fs_info->fixup_workers, &fixup->work); |
Jeff Mahoney | 87826df | 2012-02-15 16:23:57 +0100 | [diff] [blame] | 1772 | return -EBUSY; |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1773 | } |
| 1774 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1775 | static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, |
| 1776 | struct inode *inode, u64 file_pos, |
| 1777 | u64 disk_bytenr, u64 disk_num_bytes, |
| 1778 | u64 num_bytes, u64 ram_bytes, |
| 1779 | u8 compression, u8 encryption, |
| 1780 | u16 other_encoding, int extent_type) |
| 1781 | { |
| 1782 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1783 | struct btrfs_file_extent_item *fi; |
| 1784 | struct btrfs_path *path; |
| 1785 | struct extent_buffer *leaf; |
| 1786 | struct btrfs_key ins; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1787 | int ret; |
| 1788 | |
| 1789 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 1790 | if (!path) |
| 1791 | return -ENOMEM; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1792 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 1793 | path->leave_spinning = 1; |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 1794 | |
| 1795 | /* |
| 1796 | * we may be replacing one extent in the tree with another. |
| 1797 | * The new extent is pinned in the extent map, and we don't want |
| 1798 | * to drop it from the cache until it is completely in the btree. |
| 1799 | * |
| 1800 | * So, tell btrfs_drop_extents to leave this extent in the cache. |
| 1801 | * the caller is expected to unpin it and allow it to be merged |
| 1802 | * with the others. |
| 1803 | */ |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 1804 | ret = btrfs_drop_extents(trans, root, inode, file_pos, |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 1805 | file_pos + num_bytes, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1806 | if (ret) |
| 1807 | goto out; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1808 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1809 | ins.objectid = btrfs_ino(inode); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1810 | ins.offset = file_pos; |
| 1811 | ins.type = BTRFS_EXTENT_DATA_KEY; |
| 1812 | ret = btrfs_insert_empty_item(trans, root, path, &ins, sizeof(*fi)); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1813 | if (ret) |
| 1814 | goto out; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1815 | leaf = path->nodes[0]; |
| 1816 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1817 | struct btrfs_file_extent_item); |
| 1818 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
| 1819 | btrfs_set_file_extent_type(leaf, fi, extent_type); |
| 1820 | btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr); |
| 1821 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes); |
| 1822 | btrfs_set_file_extent_offset(leaf, fi, 0); |
| 1823 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); |
| 1824 | btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes); |
| 1825 | btrfs_set_file_extent_compression(leaf, fi, compression); |
| 1826 | btrfs_set_file_extent_encryption(leaf, fi, encryption); |
| 1827 | btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 1828 | |
| 1829 | btrfs_unlock_up_safe(path, 1); |
| 1830 | btrfs_set_lock_blocking(leaf); |
| 1831 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1832 | btrfs_mark_buffer_dirty(leaf); |
| 1833 | |
| 1834 | inode_add_bytes(inode, num_bytes); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1835 | |
| 1836 | ins.objectid = disk_bytenr; |
| 1837 | ins.offset = disk_num_bytes; |
| 1838 | ins.type = BTRFS_EXTENT_ITEM_KEY; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1839 | ret = btrfs_alloc_reserved_file_extent(trans, root, |
| 1840 | root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1841 | btrfs_ino(inode), file_pos, &ins); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1842 | out: |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1843 | btrfs_free_path(path); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 1844 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1845 | return ret; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1846 | } |
| 1847 | |
Chris Mason | 5d13a98 | 2009-03-13 11:41:46 -0400 | [diff] [blame] | 1848 | /* |
| 1849 | * helper function for btrfs_finish_ordered_io, this |
| 1850 | * just reads in some of the csum leaves to prime them into ram |
| 1851 | * before we start the transaction. It limits the amount of btree |
| 1852 | * reads required while inside the transaction. |
| 1853 | */ |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1854 | /* as ordered data IO finishes, this gets called so we can finish |
| 1855 | * an ordered extent if the range of bytes in the file it covers are |
| 1856 | * fully written. |
| 1857 | */ |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 1858 | static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1859 | { |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 1860 | struct inode *inode = ordered_extent->inode; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1861 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1862 | struct btrfs_trans_handle *trans = NULL; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1863 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1864 | struct extent_state *cached_state = NULL; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1865 | int compress_type = 0; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1866 | int ret; |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1867 | bool nolock; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1868 | |
Liu Bo | 83eea1f | 2012-07-10 05:28:39 -0600 | [diff] [blame] | 1869 | nolock = btrfs_is_free_space_inode(inode); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1870 | |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 1871 | if (test_bit(BTRFS_ORDERED_IOERR, &ordered_extent->flags)) { |
| 1872 | ret = -EIO; |
| 1873 | goto out; |
| 1874 | } |
| 1875 | |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 1876 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1877 | BUG_ON(!list_empty(&ordered_extent->list)); /* Logic error */ |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 1878 | ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
| 1879 | if (!ret) { |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1880 | if (nolock) |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1881 | trans = btrfs_join_transaction_nolock(root); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1882 | else |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1883 | trans = btrfs_join_transaction(root); |
Liu Bo | d280e5b | 2012-08-21 21:13:25 -0600 | [diff] [blame] | 1884 | if (IS_ERR(trans)) { |
| 1885 | ret = PTR_ERR(trans); |
| 1886 | trans = NULL; |
| 1887 | goto out; |
| 1888 | } |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1889 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 1890 | ret = btrfs_update_inode_fallback(trans, root, inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1891 | if (ret) /* -ENOMEM or corruption */ |
| 1892 | btrfs_abort_transaction(trans, root, ret); |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 1893 | } |
| 1894 | goto out; |
| 1895 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1896 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1897 | lock_extent_bits(io_tree, ordered_extent->file_offset, |
| 1898 | ordered_extent->file_offset + ordered_extent->len - 1, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 1899 | 0, &cached_state); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1900 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1901 | if (nolock) |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1902 | trans = btrfs_join_transaction_nolock(root); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1903 | else |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1904 | trans = btrfs_join_transaction(root); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1905 | if (IS_ERR(trans)) { |
| 1906 | ret = PTR_ERR(trans); |
| 1907 | trans = NULL; |
| 1908 | goto out_unlock; |
| 1909 | } |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1910 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 1911 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1912 | if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags)) |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1913 | compress_type = ordered_extent->compress_type; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1914 | if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1915 | BUG_ON(compress_type); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1916 | ret = btrfs_mark_extent_written(trans, inode, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1917 | ordered_extent->file_offset, |
| 1918 | ordered_extent->file_offset + |
| 1919 | ordered_extent->len); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1920 | } else { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 1921 | BUG_ON(root == root->fs_info->tree_root); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1922 | ret = insert_reserved_file_extent(trans, inode, |
| 1923 | ordered_extent->file_offset, |
| 1924 | ordered_extent->start, |
| 1925 | ordered_extent->disk_len, |
| 1926 | ordered_extent->len, |
| 1927 | ordered_extent->len, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1928 | compress_type, 0, 0, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1929 | BTRFS_FILE_EXTENT_REG); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1930 | } |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 1931 | unpin_extent_cache(&BTRFS_I(inode)->extent_tree, |
| 1932 | ordered_extent->file_offset, ordered_extent->len, |
| 1933 | trans->transid); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1934 | if (ret < 0) { |
| 1935 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 1936 | goto out_unlock; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1937 | } |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1938 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1939 | add_pending_csums(trans, inode, ordered_extent->file_offset, |
| 1940 | &ordered_extent->list); |
| 1941 | |
Josef Bacik | 1ef30be | 2011-04-05 19:25:36 -0400 | [diff] [blame] | 1942 | ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
Miao Xie | a39f752 | 2011-09-11 10:52:25 -0400 | [diff] [blame] | 1943 | if (!ret || !test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 1944 | ret = btrfs_update_inode_fallback(trans, root, inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1945 | if (ret) { /* -ENOMEM or corruption */ |
| 1946 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 1947 | goto out_unlock; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 1948 | } |
Josef Bacik | 7c73531 | 2012-08-13 15:43:26 -0400 | [diff] [blame] | 1949 | } else { |
| 1950 | btrfs_set_inode_last_trans(trans, inode); |
Josef Bacik | 1ef30be | 2011-04-05 19:25:36 -0400 | [diff] [blame] | 1951 | } |
| 1952 | ret = 0; |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 1953 | out_unlock: |
| 1954 | unlock_extent_cached(io_tree, ordered_extent->file_offset, |
| 1955 | ordered_extent->file_offset + |
| 1956 | ordered_extent->len - 1, &cached_state, GFP_NOFS); |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 1957 | out: |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 1958 | if (root != root->fs_info->tree_root) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1959 | btrfs_delalloc_release_metadata(inode, ordered_extent->len); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 1960 | if (trans) { |
| 1961 | if (nolock) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1962 | btrfs_end_transaction_nolock(trans, root); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 1963 | else |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1964 | btrfs_end_transaction(trans, root); |
| 1965 | } |
| 1966 | |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 1967 | if (ret) |
| 1968 | clear_extent_uptodate(io_tree, ordered_extent->file_offset, |
| 1969 | ordered_extent->file_offset + |
| 1970 | ordered_extent->len - 1, NULL, GFP_NOFS); |
| 1971 | |
| 1972 | /* |
| 1973 | * This needs to be dont to make sure anybody waiting knows we are done |
| 1974 | * upating everything for this ordered extent. |
| 1975 | */ |
| 1976 | btrfs_remove_ordered_extent(inode, ordered_extent); |
| 1977 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1978 | /* once for us */ |
| 1979 | btrfs_put_ordered_extent(ordered_extent); |
| 1980 | /* once for the tree */ |
| 1981 | btrfs_put_ordered_extent(ordered_extent); |
| 1982 | |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 1983 | return ret; |
| 1984 | } |
| 1985 | |
| 1986 | static void finish_ordered_fn(struct btrfs_work *work) |
| 1987 | { |
| 1988 | struct btrfs_ordered_extent *ordered_extent; |
| 1989 | ordered_extent = container_of(work, struct btrfs_ordered_extent, work); |
| 1990 | btrfs_finish_ordered_io(ordered_extent); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1991 | } |
| 1992 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1993 | static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, |
Chris Mason | 211f90e | 2008-07-18 11:56:15 -0400 | [diff] [blame] | 1994 | struct extent_state *state, int uptodate) |
| 1995 | { |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 1996 | struct inode *inode = page->mapping->host; |
| 1997 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1998 | struct btrfs_ordered_extent *ordered_extent = NULL; |
| 1999 | struct btrfs_workers *workers; |
| 2000 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 2001 | trace_btrfs_writepage_end_io_hook(page, start, end, uptodate); |
| 2002 | |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 2003 | ClearPagePrivate2(page); |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 2004 | if (!btrfs_dec_test_ordered_pending(inode, &ordered_extent, start, |
| 2005 | end - start + 1, uptodate)) |
| 2006 | return 0; |
| 2007 | |
| 2008 | ordered_extent->work.func = finish_ordered_fn; |
| 2009 | ordered_extent->work.flags = 0; |
| 2010 | |
Liu Bo | 83eea1f | 2012-07-10 05:28:39 -0600 | [diff] [blame] | 2011 | if (btrfs_is_free_space_inode(inode)) |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 2012 | workers = &root->fs_info->endio_freespace_worker; |
| 2013 | else |
| 2014 | workers = &root->fs_info->endio_write_workers; |
| 2015 | btrfs_queue_worker(workers, &ordered_extent->work); |
| 2016 | |
| 2017 | return 0; |
Chris Mason | 211f90e | 2008-07-18 11:56:15 -0400 | [diff] [blame] | 2018 | } |
| 2019 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2020 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2021 | * when reads are done, we need to check csums to verify the data is correct |
Jan Schmidt | 4a54c8c | 2011-07-22 15:41:52 +0200 | [diff] [blame] | 2022 | * if there's a match, we allow the bio to finish. If not, the code in |
| 2023 | * extent_io.c will try to find good copies for us. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2024 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 2025 | static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
Josef Bacik | 5cf1ab5 | 2012-04-16 09:42:26 -0400 | [diff] [blame] | 2026 | struct extent_state *state, int mirror) |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 2027 | { |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 2028 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 2029 | struct inode *inode = page->mapping->host; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2030 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 2031 | char *kaddr; |
Chris Mason | aadfeb6 | 2008-01-29 09:10:27 -0500 | [diff] [blame] | 2032 | u64 private = ~(u32)0; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 2033 | int ret; |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 2034 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2035 | u32 csum = ~(u32)0; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2036 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 2037 | if (PageChecked(page)) { |
| 2038 | ClearPageChecked(page); |
| 2039 | goto good; |
| 2040 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 2041 | |
| 2042 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) |
Jan Schmidt | 08d2f34 | 2011-05-04 16:18:50 +0200 | [diff] [blame] | 2043 | goto good; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 2044 | |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 2045 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID && |
Chris Mason | 9655d29 | 2009-09-02 15:22:30 -0400 | [diff] [blame] | 2046 | test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) { |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 2047 | clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM, |
| 2048 | GFP_NOFS); |
| 2049 | return 0; |
| 2050 | } |
| 2051 | |
Yan | c2e639f | 2008-02-04 08:57:25 -0500 | [diff] [blame] | 2052 | if (state && state->start == start) { |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 2053 | private = state->private; |
| 2054 | ret = 0; |
| 2055 | } else { |
| 2056 | ret = get_state_private(io_tree, start, &private); |
| 2057 | } |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 2058 | kaddr = kmap_atomic(page); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2059 | if (ret) |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 2060 | goto zeroit; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2061 | |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 2062 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
| 2063 | btrfs_csum_final(csum, (char *)&csum); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2064 | if (csum != private) |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 2065 | goto zeroit; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2066 | |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 2067 | kunmap_atomic(kaddr); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 2068 | good: |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 2069 | return 0; |
| 2070 | |
| 2071 | zeroit: |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 2072 | printk_ratelimited(KERN_INFO "btrfs csum failed ino %llu off %llu csum %u " |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2073 | "private %llu\n", |
| 2074 | (unsigned long long)btrfs_ino(page->mapping->host), |
Chris Mason | 193f284 | 2009-04-27 07:29:05 -0400 | [diff] [blame] | 2075 | (unsigned long long)start, csum, |
| 2076 | (unsigned long long)private); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2077 | memset(kaddr + offset, 1, end - start + 1); |
| 2078 | flush_dcache_page(page); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 2079 | kunmap_atomic(kaddr); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 2080 | if (private == 0) |
| 2081 | return 0; |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 2082 | return -EIO; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 2083 | } |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2084 | |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 2085 | struct delayed_iput { |
| 2086 | struct list_head list; |
| 2087 | struct inode *inode; |
| 2088 | }; |
| 2089 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2090 | /* JDM: If this is fs-wide, why can't we add a pointer to |
| 2091 | * btrfs_inode instead and avoid the allocation? */ |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 2092 | void btrfs_add_delayed_iput(struct inode *inode) |
| 2093 | { |
| 2094 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; |
| 2095 | struct delayed_iput *delayed; |
| 2096 | |
| 2097 | if (atomic_add_unless(&inode->i_count, -1, 1)) |
| 2098 | return; |
| 2099 | |
| 2100 | delayed = kmalloc(sizeof(*delayed), GFP_NOFS | __GFP_NOFAIL); |
| 2101 | delayed->inode = inode; |
| 2102 | |
| 2103 | spin_lock(&fs_info->delayed_iput_lock); |
| 2104 | list_add_tail(&delayed->list, &fs_info->delayed_iputs); |
| 2105 | spin_unlock(&fs_info->delayed_iput_lock); |
| 2106 | } |
| 2107 | |
| 2108 | void btrfs_run_delayed_iputs(struct btrfs_root *root) |
| 2109 | { |
| 2110 | LIST_HEAD(list); |
| 2111 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2112 | struct delayed_iput *delayed; |
| 2113 | int empty; |
| 2114 | |
| 2115 | spin_lock(&fs_info->delayed_iput_lock); |
| 2116 | empty = list_empty(&fs_info->delayed_iputs); |
| 2117 | spin_unlock(&fs_info->delayed_iput_lock); |
| 2118 | if (empty) |
| 2119 | return; |
| 2120 | |
| 2121 | down_read(&root->fs_info->cleanup_work_sem); |
| 2122 | spin_lock(&fs_info->delayed_iput_lock); |
| 2123 | list_splice_init(&fs_info->delayed_iputs, &list); |
| 2124 | spin_unlock(&fs_info->delayed_iput_lock); |
| 2125 | |
| 2126 | while (!list_empty(&list)) { |
| 2127 | delayed = list_entry(list.next, struct delayed_iput, list); |
| 2128 | list_del(&delayed->list); |
| 2129 | iput(delayed->inode); |
| 2130 | kfree(delayed); |
| 2131 | } |
| 2132 | up_read(&root->fs_info->cleanup_work_sem); |
| 2133 | } |
| 2134 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2135 | enum btrfs_orphan_cleanup_state { |
| 2136 | ORPHAN_CLEANUP_STARTED = 1, |
| 2137 | ORPHAN_CLEANUP_DONE = 2, |
| 2138 | }; |
| 2139 | |
| 2140 | /* |
Justin P. Mattock | 42b2aa8 | 2011-11-28 20:31:00 -0800 | [diff] [blame] | 2141 | * This is called in transaction commit time. If there are no orphan |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2142 | * files in the subvolume, it removes orphan item and frees block_rsv |
| 2143 | * structure. |
| 2144 | */ |
| 2145 | void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, |
| 2146 | struct btrfs_root *root) |
| 2147 | { |
Josef Bacik | 90290e1 | 2011-12-02 15:44:12 -0500 | [diff] [blame] | 2148 | struct btrfs_block_rsv *block_rsv; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2149 | int ret; |
| 2150 | |
Josef Bacik | 8a35d95 | 2012-05-23 14:26:42 -0400 | [diff] [blame] | 2151 | if (atomic_read(&root->orphan_inodes) || |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2152 | root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) |
| 2153 | return; |
| 2154 | |
Josef Bacik | 90290e1 | 2011-12-02 15:44:12 -0500 | [diff] [blame] | 2155 | spin_lock(&root->orphan_lock); |
Josef Bacik | 8a35d95 | 2012-05-23 14:26:42 -0400 | [diff] [blame] | 2156 | if (atomic_read(&root->orphan_inodes)) { |
Josef Bacik | 90290e1 | 2011-12-02 15:44:12 -0500 | [diff] [blame] | 2157 | spin_unlock(&root->orphan_lock); |
| 2158 | return; |
| 2159 | } |
| 2160 | |
| 2161 | if (root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) { |
| 2162 | spin_unlock(&root->orphan_lock); |
| 2163 | return; |
| 2164 | } |
| 2165 | |
| 2166 | block_rsv = root->orphan_block_rsv; |
| 2167 | root->orphan_block_rsv = NULL; |
| 2168 | spin_unlock(&root->orphan_lock); |
| 2169 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2170 | if (root->orphan_item_inserted && |
| 2171 | btrfs_root_refs(&root->root_item) > 0) { |
| 2172 | ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root, |
| 2173 | root->root_key.objectid); |
| 2174 | BUG_ON(ret); |
| 2175 | root->orphan_item_inserted = 0; |
| 2176 | } |
| 2177 | |
Josef Bacik | 90290e1 | 2011-12-02 15:44:12 -0500 | [diff] [blame] | 2178 | if (block_rsv) { |
| 2179 | WARN_ON(block_rsv->size > 0); |
| 2180 | btrfs_free_block_rsv(root, block_rsv); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2181 | } |
| 2182 | } |
| 2183 | |
| 2184 | /* |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2185 | * This creates an orphan entry for the given inode in case something goes |
| 2186 | * wrong in the middle of an unlink/truncate. |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2187 | * |
| 2188 | * NOTE: caller of this function should reserve 5 units of metadata for |
| 2189 | * this function. |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2190 | */ |
| 2191 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) |
| 2192 | { |
| 2193 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2194 | struct btrfs_block_rsv *block_rsv = NULL; |
| 2195 | int reserve = 0; |
| 2196 | int insert = 0; |
| 2197 | int ret; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2198 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2199 | if (!root->orphan_block_rsv) { |
| 2200 | block_rsv = btrfs_alloc_block_rsv(root); |
Tsutomu Itoh | b532402 | 2011-07-19 07:27:20 +0000 | [diff] [blame] | 2201 | if (!block_rsv) |
| 2202 | return -ENOMEM; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2203 | } |
| 2204 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2205 | spin_lock(&root->orphan_lock); |
| 2206 | if (!root->orphan_block_rsv) { |
| 2207 | root->orphan_block_rsv = block_rsv; |
| 2208 | } else if (block_rsv) { |
| 2209 | btrfs_free_block_rsv(root, block_rsv); |
| 2210 | block_rsv = NULL; |
| 2211 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2212 | |
Josef Bacik | 8a35d95 | 2012-05-23 14:26:42 -0400 | [diff] [blame] | 2213 | if (!test_and_set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
| 2214 | &BTRFS_I(inode)->runtime_flags)) { |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2215 | #if 0 |
| 2216 | /* |
| 2217 | * For proper ENOSPC handling, we should do orphan |
| 2218 | * cleanup when mounting. But this introduces backward |
| 2219 | * compatibility issue. |
| 2220 | */ |
| 2221 | if (!xchg(&root->orphan_item_inserted, 1)) |
| 2222 | insert = 2; |
| 2223 | else |
| 2224 | insert = 1; |
| 2225 | #endif |
| 2226 | insert = 1; |
Miao Xie | 321f0e7 | 2012-08-28 22:13:02 -0600 | [diff] [blame] | 2227 | atomic_inc(&root->orphan_inodes); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2228 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2229 | |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 2230 | if (!test_and_set_bit(BTRFS_INODE_ORPHAN_META_RESERVED, |
| 2231 | &BTRFS_I(inode)->runtime_flags)) |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2232 | reserve = 1; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2233 | spin_unlock(&root->orphan_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2234 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2235 | /* grab metadata reservation from transaction handle */ |
| 2236 | if (reserve) { |
| 2237 | ret = btrfs_orphan_reserve_metadata(trans, inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2238 | BUG_ON(ret); /* -ENOSPC in reservation; Logic error? JDM */ |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2239 | } |
| 2240 | |
| 2241 | /* insert an orphan item to track this unlinked/truncated file */ |
| 2242 | if (insert >= 1) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2243 | ret = btrfs_insert_orphan_item(trans, root, btrfs_ino(inode)); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2244 | if (ret && ret != -EEXIST) { |
Josef Bacik | 8a35d95 | 2012-05-23 14:26:42 -0400 | [diff] [blame] | 2245 | clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
| 2246 | &BTRFS_I(inode)->runtime_flags); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2247 | btrfs_abort_transaction(trans, root, ret); |
| 2248 | return ret; |
| 2249 | } |
| 2250 | ret = 0; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2251 | } |
| 2252 | |
| 2253 | /* insert an orphan item to track subvolume contains orphan files */ |
| 2254 | if (insert >= 2) { |
| 2255 | ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root, |
| 2256 | root->root_key.objectid); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2257 | if (ret && ret != -EEXIST) { |
| 2258 | btrfs_abort_transaction(trans, root, ret); |
| 2259 | return ret; |
| 2260 | } |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2261 | } |
| 2262 | return 0; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2263 | } |
| 2264 | |
| 2265 | /* |
| 2266 | * We have done the truncate/delete so we can go ahead and remove the orphan |
| 2267 | * item for this particular inode. |
| 2268 | */ |
| 2269 | int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) |
| 2270 | { |
| 2271 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2272 | int delete_item = 0; |
| 2273 | int release_rsv = 0; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2274 | int ret = 0; |
| 2275 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2276 | spin_lock(&root->orphan_lock); |
Josef Bacik | 8a35d95 | 2012-05-23 14:26:42 -0400 | [diff] [blame] | 2277 | if (test_and_clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
| 2278 | &BTRFS_I(inode)->runtime_flags)) |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2279 | delete_item = 1; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2280 | |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 2281 | if (test_and_clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED, |
| 2282 | &BTRFS_I(inode)->runtime_flags)) |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2283 | release_rsv = 1; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2284 | spin_unlock(&root->orphan_lock); |
| 2285 | |
| 2286 | if (trans && delete_item) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2287 | ret = btrfs_del_orphan_item(trans, root, btrfs_ino(inode)); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2288 | BUG_ON(ret); /* -ENOMEM or corruption (JDM: Recheck) */ |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2289 | } |
| 2290 | |
Josef Bacik | 8a35d95 | 2012-05-23 14:26:42 -0400 | [diff] [blame] | 2291 | if (release_rsv) { |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2292 | btrfs_orphan_release_metadata(inode); |
Josef Bacik | 8a35d95 | 2012-05-23 14:26:42 -0400 | [diff] [blame] | 2293 | atomic_dec(&root->orphan_inodes); |
| 2294 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2295 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2296 | return 0; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2297 | } |
| 2298 | |
| 2299 | /* |
| 2300 | * this cleans up any orphans that may be left on the list from the last use |
| 2301 | * of this root. |
| 2302 | */ |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2303 | int btrfs_orphan_cleanup(struct btrfs_root *root) |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2304 | { |
| 2305 | struct btrfs_path *path; |
| 2306 | struct extent_buffer *leaf; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2307 | struct btrfs_key key, found_key; |
| 2308 | struct btrfs_trans_handle *trans; |
| 2309 | struct inode *inode; |
Josef Bacik | 8f6d7f4 | 2011-09-26 15:55:20 -0400 | [diff] [blame] | 2310 | u64 last_objectid = 0; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2311 | int ret = 0, nr_unlink = 0, nr_truncate = 0; |
| 2312 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2313 | if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED)) |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2314 | return 0; |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 2315 | |
| 2316 | path = btrfs_alloc_path(); |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2317 | if (!path) { |
| 2318 | ret = -ENOMEM; |
| 2319 | goto out; |
| 2320 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2321 | path->reada = -1; |
| 2322 | |
| 2323 | key.objectid = BTRFS_ORPHAN_OBJECTID; |
| 2324 | btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); |
| 2325 | key.offset = (u64)-1; |
| 2326 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2327 | while (1) { |
| 2328 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2329 | if (ret < 0) |
| 2330 | goto out; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2331 | |
| 2332 | /* |
| 2333 | * if ret == 0 means we found what we were searching for, which |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2334 | * is weird, but possible, so only screw with path if we didn't |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2335 | * find the key and see if we have stuff that matches |
| 2336 | */ |
| 2337 | if (ret > 0) { |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2338 | ret = 0; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2339 | if (path->slots[0] == 0) |
| 2340 | break; |
| 2341 | path->slots[0]--; |
| 2342 | } |
| 2343 | |
| 2344 | /* pull out the item */ |
| 2345 | leaf = path->nodes[0]; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2346 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 2347 | |
| 2348 | /* make sure the item matches what we want */ |
| 2349 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) |
| 2350 | break; |
| 2351 | if (btrfs_key_type(&found_key) != BTRFS_ORPHAN_ITEM_KEY) |
| 2352 | break; |
| 2353 | |
| 2354 | /* release the path since we're done with it */ |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2355 | btrfs_release_path(path); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2356 | |
| 2357 | /* |
| 2358 | * this is where we are basically btrfs_lookup, without the |
| 2359 | * crossing root thing. we store the inode number in the |
| 2360 | * offset of the orphan item. |
| 2361 | */ |
Josef Bacik | 8f6d7f4 | 2011-09-26 15:55:20 -0400 | [diff] [blame] | 2362 | |
| 2363 | if (found_key.offset == last_objectid) { |
| 2364 | printk(KERN_ERR "btrfs: Error removing orphan entry, " |
| 2365 | "stopping orphan cleanup\n"); |
| 2366 | ret = -EINVAL; |
| 2367 | goto out; |
| 2368 | } |
| 2369 | |
| 2370 | last_objectid = found_key.offset; |
| 2371 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2372 | found_key.objectid = found_key.offset; |
| 2373 | found_key.type = BTRFS_INODE_ITEM_KEY; |
| 2374 | found_key.offset = 0; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 2375 | inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL); |
Josef Bacik | a8c9e57 | 2011-09-21 16:55:59 -0400 | [diff] [blame] | 2376 | ret = PTR_RET(inode); |
| 2377 | if (ret && ret != -ESTALE) |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2378 | goto out; |
Josef Bacik | a8c9e57 | 2011-09-21 16:55:59 -0400 | [diff] [blame] | 2379 | |
Arne Jansen | f8e9e0b | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 2380 | if (ret == -ESTALE && root == root->fs_info->tree_root) { |
| 2381 | struct btrfs_root *dead_root; |
| 2382 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2383 | int is_dead_root = 0; |
| 2384 | |
| 2385 | /* |
| 2386 | * this is an orphan in the tree root. Currently these |
| 2387 | * could come from 2 sources: |
| 2388 | * a) a snapshot deletion in progress |
| 2389 | * b) a free space cache inode |
| 2390 | * We need to distinguish those two, as the snapshot |
| 2391 | * orphan must not get deleted. |
| 2392 | * find_dead_roots already ran before us, so if this |
| 2393 | * is a snapshot deletion, we should find the root |
| 2394 | * in the dead_roots list |
| 2395 | */ |
| 2396 | spin_lock(&fs_info->trans_lock); |
| 2397 | list_for_each_entry(dead_root, &fs_info->dead_roots, |
| 2398 | root_list) { |
| 2399 | if (dead_root->root_key.objectid == |
| 2400 | found_key.objectid) { |
| 2401 | is_dead_root = 1; |
| 2402 | break; |
| 2403 | } |
| 2404 | } |
| 2405 | spin_unlock(&fs_info->trans_lock); |
| 2406 | if (is_dead_root) { |
| 2407 | /* prevent this orphan from being found again */ |
| 2408 | key.offset = found_key.objectid - 1; |
| 2409 | continue; |
| 2410 | } |
| 2411 | } |
Josef Bacik | a8c9e57 | 2011-09-21 16:55:59 -0400 | [diff] [blame] | 2412 | /* |
| 2413 | * Inode is already gone but the orphan item is still there, |
| 2414 | * kill the orphan item. |
| 2415 | */ |
| 2416 | if (ret == -ESTALE) { |
| 2417 | trans = btrfs_start_transaction(root, 1); |
| 2418 | if (IS_ERR(trans)) { |
| 2419 | ret = PTR_ERR(trans); |
| 2420 | goto out; |
| 2421 | } |
Josef Bacik | 8a35d95 | 2012-05-23 14:26:42 -0400 | [diff] [blame] | 2422 | printk(KERN_ERR "auto deleting %Lu\n", |
| 2423 | found_key.objectid); |
Josef Bacik | a8c9e57 | 2011-09-21 16:55:59 -0400 | [diff] [blame] | 2424 | ret = btrfs_del_orphan_item(trans, root, |
| 2425 | found_key.objectid); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2426 | BUG_ON(ret); /* -ENOMEM or corruption (JDM: Recheck) */ |
Josef Bacik | a8c9e57 | 2011-09-21 16:55:59 -0400 | [diff] [blame] | 2427 | btrfs_end_transaction(trans, root); |
| 2428 | continue; |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2429 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2430 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2431 | /* |
| 2432 | * add this inode to the orphan list so btrfs_orphan_del does |
| 2433 | * the proper thing when we hit it |
| 2434 | */ |
Josef Bacik | 8a35d95 | 2012-05-23 14:26:42 -0400 | [diff] [blame] | 2435 | set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
| 2436 | &BTRFS_I(inode)->runtime_flags); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2437 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2438 | /* if we have links, this was a truncate, lets do that */ |
| 2439 | if (inode->i_nlink) { |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 2440 | if (!S_ISREG(inode->i_mode)) { |
| 2441 | WARN_ON(1); |
| 2442 | iput(inode); |
| 2443 | continue; |
| 2444 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2445 | nr_truncate++; |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2446 | ret = btrfs_truncate(inode); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2447 | } else { |
| 2448 | nr_unlink++; |
| 2449 | } |
| 2450 | |
| 2451 | /* this will do delete_inode and everything for us */ |
| 2452 | iput(inode); |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2453 | if (ret) |
| 2454 | goto out; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2455 | } |
Miao Xie | 3254c87 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 2456 | /* release the path since we're done with it */ |
| 2457 | btrfs_release_path(path); |
| 2458 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2459 | root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE; |
| 2460 | |
| 2461 | if (root->orphan_block_rsv) |
| 2462 | btrfs_block_rsv_release(root, root->orphan_block_rsv, |
| 2463 | (u64)-1); |
| 2464 | |
| 2465 | if (root->orphan_block_rsv || root->orphan_item_inserted) { |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 2466 | trans = btrfs_join_transaction(root); |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2467 | if (!IS_ERR(trans)) |
| 2468 | btrfs_end_transaction(trans, root); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2469 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2470 | |
| 2471 | if (nr_unlink) |
| 2472 | printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink); |
| 2473 | if (nr_truncate) |
| 2474 | printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate); |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2475 | |
| 2476 | out: |
| 2477 | if (ret) |
| 2478 | printk(KERN_CRIT "btrfs: could not do orphan cleanup %d\n", ret); |
| 2479 | btrfs_free_path(path); |
| 2480 | return ret; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2481 | } |
| 2482 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2483 | /* |
Chris Mason | 46a53cc | 2009-04-27 11:47:50 -0400 | [diff] [blame] | 2484 | * very simple check to peek ahead in the leaf looking for xattrs. If we |
| 2485 | * don't find any xattrs, we know there can't be any acls. |
| 2486 | * |
| 2487 | * slot is the slot the inode is in, objectid is the objectid of the inode |
| 2488 | */ |
| 2489 | static noinline int acls_after_inode_item(struct extent_buffer *leaf, |
| 2490 | int slot, u64 objectid) |
| 2491 | { |
| 2492 | u32 nritems = btrfs_header_nritems(leaf); |
| 2493 | struct btrfs_key found_key; |
| 2494 | int scanned = 0; |
| 2495 | |
| 2496 | slot++; |
| 2497 | while (slot < nritems) { |
| 2498 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 2499 | |
| 2500 | /* we found a different objectid, there must not be acls */ |
| 2501 | if (found_key.objectid != objectid) |
| 2502 | return 0; |
| 2503 | |
| 2504 | /* we found an xattr, assume we've got an acl */ |
| 2505 | if (found_key.type == BTRFS_XATTR_ITEM_KEY) |
| 2506 | return 1; |
| 2507 | |
| 2508 | /* |
| 2509 | * we found a key greater than an xattr key, there can't |
| 2510 | * be any acls later on |
| 2511 | */ |
| 2512 | if (found_key.type > BTRFS_XATTR_ITEM_KEY) |
| 2513 | return 0; |
| 2514 | |
| 2515 | slot++; |
| 2516 | scanned++; |
| 2517 | |
| 2518 | /* |
| 2519 | * it goes inode, inode backrefs, xattrs, extents, |
| 2520 | * so if there are a ton of hard links to an inode there can |
| 2521 | * be a lot of backrefs. Don't waste time searching too hard, |
| 2522 | * this is just an optimization |
| 2523 | */ |
| 2524 | if (scanned >= 8) |
| 2525 | break; |
| 2526 | } |
| 2527 | /* we hit the end of the leaf before we found an xattr or |
| 2528 | * something larger than an xattr. We have to assume the inode |
| 2529 | * has acls |
| 2530 | */ |
| 2531 | return 1; |
| 2532 | } |
| 2533 | |
| 2534 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2535 | * read an inode from the btree into the in-memory inode |
| 2536 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2537 | static void btrfs_read_locked_inode(struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2538 | { |
| 2539 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2540 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2541 | struct btrfs_inode_item *inode_item; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2542 | struct btrfs_timespec *tspec; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2543 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2544 | struct btrfs_key location; |
Chris Mason | 46a53cc | 2009-04-27 11:47:50 -0400 | [diff] [blame] | 2545 | int maybe_acls; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 2546 | u32 rdev; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2547 | int ret; |
Miao Xie | 2f7e33d | 2011-06-23 07:27:13 +0000 | [diff] [blame] | 2548 | bool filled = false; |
| 2549 | |
| 2550 | ret = btrfs_fill_inode(inode, &rdev); |
| 2551 | if (!ret) |
| 2552 | filled = true; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2553 | |
| 2554 | path = btrfs_alloc_path(); |
Mark Fasheh | 1748f84 | 2011-07-12 11:25:31 -0700 | [diff] [blame] | 2555 | if (!path) |
| 2556 | goto make_bad; |
| 2557 | |
Josef Bacik | d90c732 | 2011-05-17 09:50:54 -0400 | [diff] [blame] | 2558 | path->leave_spinning = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2559 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 2560 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2561 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2562 | if (ret) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2563 | goto make_bad; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2564 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2565 | leaf = path->nodes[0]; |
Miao Xie | 2f7e33d | 2011-06-23 07:27:13 +0000 | [diff] [blame] | 2566 | |
| 2567 | if (filled) |
| 2568 | goto cache_acl; |
| 2569 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2570 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
| 2571 | struct btrfs_inode_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2572 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 2573 | set_nlink(inode, btrfs_inode_nlink(leaf, inode_item)); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2574 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); |
| 2575 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 2576 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2577 | |
| 2578 | tspec = btrfs_inode_atime(inode_item); |
| 2579 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); |
| 2580 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); |
| 2581 | |
| 2582 | tspec = btrfs_inode_mtime(inode_item); |
| 2583 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); |
| 2584 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); |
| 2585 | |
| 2586 | tspec = btrfs_inode_ctime(inode_item); |
| 2587 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); |
| 2588 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); |
| 2589 | |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 2590 | inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item)); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2591 | BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item); |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 2592 | BTRFS_I(inode)->last_trans = btrfs_inode_transid(leaf, inode_item); |
| 2593 | |
| 2594 | /* |
| 2595 | * If we were modified in the current generation and evicted from memory |
| 2596 | * and then re-read we need to do a full sync since we don't have any |
| 2597 | * idea about which extents were modified before we were evicted from |
| 2598 | * cache. |
| 2599 | */ |
| 2600 | if (BTRFS_I(inode)->last_trans == root->fs_info->generation) |
| 2601 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 2602 | &BTRFS_I(inode)->runtime_flags); |
| 2603 | |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 2604 | inode->i_version = btrfs_inode_sequence(leaf, inode_item); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2605 | inode->i_generation = BTRFS_I(inode)->generation; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 2606 | inode->i_rdev = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2607 | rdev = btrfs_inode_rdev(leaf, inode_item); |
| 2608 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2609 | BTRFS_I(inode)->index_cnt = (u64)-1; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2610 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
Miao Xie | 2f7e33d | 2011-06-23 07:27:13 +0000 | [diff] [blame] | 2611 | cache_acl: |
Chris Mason | 46a53cc | 2009-04-27 11:47:50 -0400 | [diff] [blame] | 2612 | /* |
| 2613 | * try to precache a NULL acl entry for files that don't have |
| 2614 | * any xattrs or acls |
| 2615 | */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2616 | maybe_acls = acls_after_inode_item(leaf, path->slots[0], |
| 2617 | btrfs_ino(inode)); |
Al Viro | 72c0490 | 2009-06-24 16:58:48 -0400 | [diff] [blame] | 2618 | if (!maybe_acls) |
| 2619 | cache_no_acl(inode); |
Chris Mason | 46a53cc | 2009-04-27 11:47:50 -0400 | [diff] [blame] | 2620 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2621 | btrfs_free_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2622 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2623 | switch (inode->i_mode & S_IFMT) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2624 | case S_IFREG: |
| 2625 | inode->i_mapping->a_ops = &btrfs_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 2626 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2627 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2628 | inode->i_fop = &btrfs_file_operations; |
| 2629 | inode->i_op = &btrfs_file_inode_operations; |
| 2630 | break; |
| 2631 | case S_IFDIR: |
| 2632 | inode->i_fop = &btrfs_dir_file_operations; |
| 2633 | if (root == root->fs_info->tree_root) |
| 2634 | inode->i_op = &btrfs_dir_ro_inode_operations; |
| 2635 | else |
| 2636 | inode->i_op = &btrfs_dir_inode_operations; |
| 2637 | break; |
| 2638 | case S_IFLNK: |
| 2639 | inode->i_op = &btrfs_symlink_inode_operations; |
| 2640 | inode->i_mapping->a_ops = &btrfs_symlink_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 2641 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2642 | break; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 2643 | default: |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 2644 | inode->i_op = &btrfs_special_inode_operations; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 2645 | init_special_inode(inode, inode->i_mode, rdev); |
| 2646 | break; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2647 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 2648 | |
| 2649 | btrfs_update_iflags(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2650 | return; |
| 2651 | |
| 2652 | make_bad: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2653 | btrfs_free_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2654 | make_bad_inode(inode); |
| 2655 | } |
| 2656 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2657 | /* |
| 2658 | * given a leaf and an inode, copy the inode fields into the leaf |
| 2659 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2660 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
| 2661 | struct extent_buffer *leaf, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2662 | struct btrfs_inode_item *item, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2663 | struct inode *inode) |
| 2664 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2665 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
| 2666 | btrfs_set_inode_gid(leaf, item, inode->i_gid); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 2667 | btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2668 | btrfs_set_inode_mode(leaf, item, inode->i_mode); |
| 2669 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); |
| 2670 | |
| 2671 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), |
| 2672 | inode->i_atime.tv_sec); |
| 2673 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), |
| 2674 | inode->i_atime.tv_nsec); |
| 2675 | |
| 2676 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), |
| 2677 | inode->i_mtime.tv_sec); |
| 2678 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), |
| 2679 | inode->i_mtime.tv_nsec); |
| 2680 | |
| 2681 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), |
| 2682 | inode->i_ctime.tv_sec); |
| 2683 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), |
| 2684 | inode->i_ctime.tv_nsec); |
| 2685 | |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 2686 | btrfs_set_inode_nbytes(leaf, item, inode_get_bytes(inode)); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2687 | btrfs_set_inode_generation(leaf, item, BTRFS_I(inode)->generation); |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 2688 | btrfs_set_inode_sequence(leaf, item, inode->i_version); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2689 | btrfs_set_inode_transid(leaf, item, trans->transid); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2690 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); |
Yan | b98b676 | 2008-01-08 15:54:37 -0500 | [diff] [blame] | 2691 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 2692 | btrfs_set_inode_block_group(leaf, item, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2693 | } |
| 2694 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2695 | /* |
| 2696 | * copy everything in the in-memory inode into the btree. |
| 2697 | */ |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 2698 | static noinline int btrfs_update_inode_item(struct btrfs_trans_handle *trans, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2699 | struct btrfs_root *root, struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2700 | { |
| 2701 | struct btrfs_inode_item *inode_item; |
| 2702 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2703 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2704 | int ret; |
| 2705 | |
| 2706 | path = btrfs_alloc_path(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2707 | if (!path) |
| 2708 | return -ENOMEM; |
| 2709 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2710 | path->leave_spinning = 1; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2711 | ret = btrfs_lookup_inode(trans, root, path, &BTRFS_I(inode)->location, |
| 2712 | 1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2713 | if (ret) { |
| 2714 | if (ret > 0) |
| 2715 | ret = -ENOENT; |
| 2716 | goto failed; |
| 2717 | } |
| 2718 | |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 2719 | btrfs_unlock_up_safe(path, 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2720 | leaf = path->nodes[0]; |
| 2721 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2722 | struct btrfs_inode_item); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2723 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2724 | fill_inode_item(trans, leaf, inode_item, inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2725 | btrfs_mark_buffer_dirty(leaf); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 2726 | btrfs_set_inode_last_trans(trans, inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2727 | ret = 0; |
| 2728 | failed: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2729 | btrfs_free_path(path); |
| 2730 | return ret; |
| 2731 | } |
| 2732 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2733 | /* |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 2734 | * copy everything in the in-memory inode into the btree. |
| 2735 | */ |
| 2736 | noinline int btrfs_update_inode(struct btrfs_trans_handle *trans, |
| 2737 | struct btrfs_root *root, struct inode *inode) |
| 2738 | { |
| 2739 | int ret; |
| 2740 | |
| 2741 | /* |
| 2742 | * If the inode is a free space inode, we can deadlock during commit |
| 2743 | * if we put it into the delayed code. |
| 2744 | * |
| 2745 | * The data relocation inode should also be directly updated |
| 2746 | * without delay |
| 2747 | */ |
Liu Bo | 83eea1f | 2012-07-10 05:28:39 -0600 | [diff] [blame] | 2748 | if (!btrfs_is_free_space_inode(inode) |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 2749 | && root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID) { |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 2750 | btrfs_update_root_times(trans, root); |
| 2751 | |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 2752 | ret = btrfs_delayed_update_inode(trans, root, inode); |
| 2753 | if (!ret) |
| 2754 | btrfs_set_inode_last_trans(trans, inode); |
| 2755 | return ret; |
| 2756 | } |
| 2757 | |
| 2758 | return btrfs_update_inode_item(trans, root, inode); |
| 2759 | } |
| 2760 | |
| 2761 | static noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, |
| 2762 | struct btrfs_root *root, struct inode *inode) |
| 2763 | { |
| 2764 | int ret; |
| 2765 | |
| 2766 | ret = btrfs_update_inode(trans, root, inode); |
| 2767 | if (ret == -ENOSPC) |
| 2768 | return btrfs_update_inode_item(trans, root, inode); |
| 2769 | return ret; |
| 2770 | } |
| 2771 | |
| 2772 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2773 | * unlink helper that gets used here in inode.c and in the tree logging |
| 2774 | * recovery code. It remove a link in a directory with a given name, and |
| 2775 | * also drops the back refs in the inode to the directory |
| 2776 | */ |
Al Viro | 9298679 | 2011-03-04 17:14:37 +0000 | [diff] [blame] | 2777 | static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
| 2778 | struct btrfs_root *root, |
| 2779 | struct inode *dir, struct inode *inode, |
| 2780 | const char *name, int name_len) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2781 | { |
| 2782 | struct btrfs_path *path; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2783 | int ret = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2784 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2785 | struct btrfs_dir_item *di; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2786 | struct btrfs_key key; |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2787 | u64 index; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2788 | u64 ino = btrfs_ino(inode); |
| 2789 | u64 dir_ino = btrfs_ino(dir); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2790 | |
| 2791 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2792 | if (!path) { |
| 2793 | ret = -ENOMEM; |
Tsutomu Itoh | 554233a | 2011-02-03 03:16:25 +0000 | [diff] [blame] | 2794 | goto out; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2795 | } |
| 2796 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2797 | path->leave_spinning = 1; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2798 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2799 | name, name_len, -1); |
| 2800 | if (IS_ERR(di)) { |
| 2801 | ret = PTR_ERR(di); |
| 2802 | goto err; |
| 2803 | } |
| 2804 | if (!di) { |
| 2805 | ret = -ENOENT; |
| 2806 | goto err; |
| 2807 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2808 | leaf = path->nodes[0]; |
| 2809 | btrfs_dir_item_key_to_cpu(leaf, di, &key); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2810 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2811 | if (ret) |
| 2812 | goto err; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2813 | btrfs_release_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2814 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2815 | ret = btrfs_del_inode_ref(trans, root, name, name_len, ino, |
| 2816 | dir_ino, &index); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2817 | if (ret) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2818 | printk(KERN_INFO "btrfs failed to delete reference to %.*s, " |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2819 | "inode %llu parent %llu\n", name_len, name, |
| 2820 | (unsigned long long)ino, (unsigned long long)dir_ino); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2821 | btrfs_abort_transaction(trans, root, ret); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2822 | goto err; |
| 2823 | } |
| 2824 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2825 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2826 | if (ret) { |
| 2827 | btrfs_abort_transaction(trans, root, ret); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2828 | goto err; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2829 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2830 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2831 | ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2832 | inode, dir_ino); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2833 | if (ret != 0 && ret != -ENOENT) { |
| 2834 | btrfs_abort_transaction(trans, root, ret); |
| 2835 | goto err; |
| 2836 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2837 | |
| 2838 | ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, |
| 2839 | dir, index); |
Chris Mason | 6418c96 | 2010-10-30 07:34:24 -0400 | [diff] [blame] | 2840 | if (ret == -ENOENT) |
| 2841 | ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2842 | err: |
| 2843 | btrfs_free_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2844 | if (ret) |
| 2845 | goto out; |
| 2846 | |
| 2847 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 2848 | inode_inc_iversion(inode); |
| 2849 | inode_inc_iversion(dir); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2850 | inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
Tsutomu Itoh | b995929 | 2012-06-25 21:25:22 -0600 | [diff] [blame] | 2851 | ret = btrfs_update_inode(trans, root, dir); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2852 | out: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2853 | return ret; |
| 2854 | } |
| 2855 | |
Al Viro | 9298679 | 2011-03-04 17:14:37 +0000 | [diff] [blame] | 2856 | int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
| 2857 | struct btrfs_root *root, |
| 2858 | struct inode *dir, struct inode *inode, |
| 2859 | const char *name, int name_len) |
| 2860 | { |
| 2861 | int ret; |
| 2862 | ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len); |
| 2863 | if (!ret) { |
| 2864 | btrfs_drop_nlink(inode); |
| 2865 | ret = btrfs_update_inode(trans, root, inode); |
| 2866 | } |
| 2867 | return ret; |
| 2868 | } |
| 2869 | |
| 2870 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2871 | /* helper to check if there is any shared block in the path */ |
| 2872 | static int check_path_shared(struct btrfs_root *root, |
| 2873 | struct btrfs_path *path) |
| 2874 | { |
| 2875 | struct extent_buffer *eb; |
| 2876 | int level; |
Dan Carpenter | 0e4dcbef | 2010-06-01 08:23:11 +0000 | [diff] [blame] | 2877 | u64 refs = 1; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2878 | |
| 2879 | for (level = 0; level < BTRFS_MAX_LEVEL; level++) { |
Josef Bacik | dedefd7 | 2011-01-24 21:43:18 +0000 | [diff] [blame] | 2880 | int ret; |
| 2881 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2882 | if (!path->nodes[level]) |
| 2883 | break; |
| 2884 | eb = path->nodes[level]; |
| 2885 | if (!btrfs_block_can_be_shared(root, eb)) |
| 2886 | continue; |
| 2887 | ret = btrfs_lookup_extent_info(NULL, root, eb->start, eb->len, |
| 2888 | &refs, NULL); |
| 2889 | if (refs > 1) |
| 2890 | return 1; |
| 2891 | } |
Josef Bacik | dedefd7 | 2011-01-24 21:43:18 +0000 | [diff] [blame] | 2892 | return 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2893 | } |
| 2894 | |
| 2895 | /* |
| 2896 | * helper to start transaction for unlink and rmdir. |
| 2897 | * |
| 2898 | * unlink and rmdir are special in btrfs, they do not always free space. |
| 2899 | * so in enospc case, we should make sure they will free space before |
| 2900 | * allowing them to use the global metadata reservation. |
| 2901 | */ |
| 2902 | static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir, |
| 2903 | struct dentry *dentry) |
| 2904 | { |
| 2905 | struct btrfs_trans_handle *trans; |
| 2906 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 2907 | struct btrfs_path *path; |
| 2908 | struct btrfs_inode_ref *ref; |
| 2909 | struct btrfs_dir_item *di; |
| 2910 | struct inode *inode = dentry->d_inode; |
| 2911 | u64 index; |
| 2912 | int check_link = 1; |
| 2913 | int err = -ENOSPC; |
| 2914 | int ret; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2915 | u64 ino = btrfs_ino(inode); |
| 2916 | u64 dir_ino = btrfs_ino(dir); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2917 | |
Josef Bacik | e70bea5 | 2011-10-11 14:18:24 -0400 | [diff] [blame] | 2918 | /* |
| 2919 | * 1 for the possible orphan item |
| 2920 | * 1 for the dir item |
| 2921 | * 1 for the dir index |
| 2922 | * 1 for the inode ref |
| 2923 | * 1 for the inode ref in the tree log |
| 2924 | * 2 for the dir entries in the log |
| 2925 | * 1 for the inode |
| 2926 | */ |
| 2927 | trans = btrfs_start_transaction(root, 8); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2928 | if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC) |
| 2929 | return trans; |
| 2930 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2931 | if (ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2932 | return ERR_PTR(-ENOSPC); |
| 2933 | |
| 2934 | /* check if there is someone else holds reference */ |
| 2935 | if (S_ISDIR(inode->i_mode) && atomic_read(&inode->i_count) > 1) |
| 2936 | return ERR_PTR(-ENOSPC); |
| 2937 | |
| 2938 | if (atomic_read(&inode->i_count) > 2) |
| 2939 | return ERR_PTR(-ENOSPC); |
| 2940 | |
| 2941 | if (xchg(&root->fs_info->enospc_unlink, 1)) |
| 2942 | return ERR_PTR(-ENOSPC); |
| 2943 | |
| 2944 | path = btrfs_alloc_path(); |
| 2945 | if (!path) { |
| 2946 | root->fs_info->enospc_unlink = 0; |
| 2947 | return ERR_PTR(-ENOMEM); |
| 2948 | } |
| 2949 | |
Josef Bacik | 3880a1b | 2011-10-14 14:46:51 -0400 | [diff] [blame] | 2950 | /* 1 for the orphan item */ |
| 2951 | trans = btrfs_start_transaction(root, 1); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2952 | if (IS_ERR(trans)) { |
| 2953 | btrfs_free_path(path); |
| 2954 | root->fs_info->enospc_unlink = 0; |
| 2955 | return trans; |
| 2956 | } |
| 2957 | |
| 2958 | path->skip_locking = 1; |
| 2959 | path->search_commit_root = 1; |
| 2960 | |
| 2961 | ret = btrfs_lookup_inode(trans, root, path, |
| 2962 | &BTRFS_I(dir)->location, 0); |
| 2963 | if (ret < 0) { |
| 2964 | err = ret; |
| 2965 | goto out; |
| 2966 | } |
| 2967 | if (ret == 0) { |
| 2968 | if (check_path_shared(root, path)) |
| 2969 | goto out; |
| 2970 | } else { |
| 2971 | check_link = 0; |
| 2972 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2973 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2974 | |
| 2975 | ret = btrfs_lookup_inode(trans, root, path, |
| 2976 | &BTRFS_I(inode)->location, 0); |
| 2977 | if (ret < 0) { |
| 2978 | err = ret; |
| 2979 | goto out; |
| 2980 | } |
| 2981 | if (ret == 0) { |
| 2982 | if (check_path_shared(root, path)) |
| 2983 | goto out; |
| 2984 | } else { |
| 2985 | check_link = 0; |
| 2986 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2987 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2988 | |
| 2989 | if (ret == 0 && S_ISREG(inode->i_mode)) { |
| 2990 | ret = btrfs_lookup_file_extent(trans, root, path, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2991 | ino, (u64)-1, 0); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2992 | if (ret < 0) { |
| 2993 | err = ret; |
| 2994 | goto out; |
| 2995 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 2996 | BUG_ON(ret == 0); /* Corruption */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2997 | if (check_path_shared(root, path)) |
| 2998 | goto out; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2999 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3000 | } |
| 3001 | |
| 3002 | if (!check_link) { |
| 3003 | err = 0; |
| 3004 | goto out; |
| 3005 | } |
| 3006 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3007 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3008 | dentry->d_name.name, dentry->d_name.len, 0); |
| 3009 | if (IS_ERR(di)) { |
| 3010 | err = PTR_ERR(di); |
| 3011 | goto out; |
| 3012 | } |
| 3013 | if (di) { |
| 3014 | if (check_path_shared(root, path)) |
| 3015 | goto out; |
| 3016 | } else { |
| 3017 | err = 0; |
| 3018 | goto out; |
| 3019 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3020 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3021 | |
| 3022 | ref = btrfs_lookup_inode_ref(trans, root, path, |
| 3023 | dentry->d_name.name, dentry->d_name.len, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3024 | ino, dir_ino, 0); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3025 | if (IS_ERR(ref)) { |
| 3026 | err = PTR_ERR(ref); |
| 3027 | goto out; |
| 3028 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3029 | BUG_ON(!ref); /* Logic error */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3030 | if (check_path_shared(root, path)) |
| 3031 | goto out; |
| 3032 | index = btrfs_inode_ref_index(path->nodes[0], ref); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3033 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3034 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 3035 | /* |
| 3036 | * This is a commit root search, if we can lookup inode item and other |
| 3037 | * relative items in the commit root, it means the transaction of |
| 3038 | * dir/file creation has been committed, and the dir index item that we |
| 3039 | * delay to insert has also been inserted into the commit root. So |
| 3040 | * we needn't worry about the delayed insertion of the dir index item |
| 3041 | * here. |
| 3042 | */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3043 | di = btrfs_lookup_dir_index_item(trans, root, path, dir_ino, index, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3044 | dentry->d_name.name, dentry->d_name.len, 0); |
| 3045 | if (IS_ERR(di)) { |
| 3046 | err = PTR_ERR(di); |
| 3047 | goto out; |
| 3048 | } |
| 3049 | BUG_ON(ret == -ENOENT); |
| 3050 | if (check_path_shared(root, path)) |
| 3051 | goto out; |
| 3052 | |
| 3053 | err = 0; |
| 3054 | out: |
| 3055 | btrfs_free_path(path); |
Josef Bacik | 3880a1b | 2011-10-14 14:46:51 -0400 | [diff] [blame] | 3056 | /* Migrate the orphan reservation over */ |
| 3057 | if (!err) |
| 3058 | err = btrfs_block_rsv_migrate(trans->block_rsv, |
| 3059 | &root->fs_info->global_block_rsv, |
Josef Bacik | 5a77d76 | 2011-11-01 14:32:23 -0400 | [diff] [blame] | 3060 | trans->bytes_reserved); |
Josef Bacik | 3880a1b | 2011-10-14 14:46:51 -0400 | [diff] [blame] | 3061 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3062 | if (err) { |
| 3063 | btrfs_end_transaction(trans, root); |
| 3064 | root->fs_info->enospc_unlink = 0; |
| 3065 | return ERR_PTR(err); |
| 3066 | } |
| 3067 | |
| 3068 | trans->block_rsv = &root->fs_info->global_block_rsv; |
| 3069 | return trans; |
| 3070 | } |
| 3071 | |
| 3072 | static void __unlink_end_trans(struct btrfs_trans_handle *trans, |
| 3073 | struct btrfs_root *root) |
| 3074 | { |
| 3075 | if (trans->block_rsv == &root->fs_info->global_block_rsv) { |
Josef Bacik | 5a77d76 | 2011-11-01 14:32:23 -0400 | [diff] [blame] | 3076 | btrfs_block_rsv_release(root, trans->block_rsv, |
| 3077 | trans->bytes_reserved); |
| 3078 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3079 | BUG_ON(!root->fs_info->enospc_unlink); |
| 3080 | root->fs_info->enospc_unlink = 0; |
| 3081 | } |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 3082 | btrfs_end_transaction(trans, root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3083 | } |
| 3084 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3085 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
| 3086 | { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3087 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3088 | struct btrfs_trans_handle *trans; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3089 | struct inode *inode = dentry->d_inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3090 | int ret; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3091 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3092 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3093 | trans = __unlink_start_trans(dir, dentry); |
| 3094 | if (IS_ERR(trans)) |
Josef Bacik | 5df6a9f | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 3095 | return PTR_ERR(trans); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3096 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 3097 | btrfs_record_unlink_dir(trans, dir, dentry->d_inode, 0); |
| 3098 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3099 | ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
| 3100 | dentry->d_name.name, dentry->d_name.len); |
Tsutomu Itoh | b532402 | 2011-07-19 07:27:20 +0000 | [diff] [blame] | 3101 | if (ret) |
| 3102 | goto out; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3103 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3104 | if (inode->i_nlink == 0) { |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3105 | ret = btrfs_orphan_add(trans, inode); |
Tsutomu Itoh | b532402 | 2011-07-19 07:27:20 +0000 | [diff] [blame] | 3106 | if (ret) |
| 3107 | goto out; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3108 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3109 | |
Tsutomu Itoh | b532402 | 2011-07-19 07:27:20 +0000 | [diff] [blame] | 3110 | out: |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3111 | nr = trans->blocks_used; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3112 | __unlink_end_trans(trans, root); |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3113 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3114 | return ret; |
| 3115 | } |
| 3116 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3117 | int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, |
| 3118 | struct btrfs_root *root, |
| 3119 | struct inode *dir, u64 objectid, |
| 3120 | const char *name, int name_len) |
| 3121 | { |
| 3122 | struct btrfs_path *path; |
| 3123 | struct extent_buffer *leaf; |
| 3124 | struct btrfs_dir_item *di; |
| 3125 | struct btrfs_key key; |
| 3126 | u64 index; |
| 3127 | int ret; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3128 | u64 dir_ino = btrfs_ino(dir); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3129 | |
| 3130 | path = btrfs_alloc_path(); |
| 3131 | if (!path) |
| 3132 | return -ENOMEM; |
| 3133 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3134 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3135 | name, name_len, -1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3136 | if (IS_ERR_OR_NULL(di)) { |
| 3137 | if (!di) |
| 3138 | ret = -ENOENT; |
| 3139 | else |
| 3140 | ret = PTR_ERR(di); |
| 3141 | goto out; |
| 3142 | } |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3143 | |
| 3144 | leaf = path->nodes[0]; |
| 3145 | btrfs_dir_item_key_to_cpu(leaf, di, &key); |
| 3146 | WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid); |
| 3147 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3148 | if (ret) { |
| 3149 | btrfs_abort_transaction(trans, root, ret); |
| 3150 | goto out; |
| 3151 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3152 | btrfs_release_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3153 | |
| 3154 | ret = btrfs_del_root_ref(trans, root->fs_info->tree_root, |
| 3155 | objectid, root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3156 | dir_ino, &index, name, name_len); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3157 | if (ret < 0) { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3158 | if (ret != -ENOENT) { |
| 3159 | btrfs_abort_transaction(trans, root, ret); |
| 3160 | goto out; |
| 3161 | } |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3162 | di = btrfs_search_dir_index_item(root, path, dir_ino, |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3163 | name, name_len); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3164 | if (IS_ERR_OR_NULL(di)) { |
| 3165 | if (!di) |
| 3166 | ret = -ENOENT; |
| 3167 | else |
| 3168 | ret = PTR_ERR(di); |
| 3169 | btrfs_abort_transaction(trans, root, ret); |
| 3170 | goto out; |
| 3171 | } |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3172 | |
| 3173 | leaf = path->nodes[0]; |
| 3174 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3175 | btrfs_release_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3176 | index = key.offset; |
| 3177 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3178 | btrfs_release_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3179 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 3180 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3181 | if (ret) { |
| 3182 | btrfs_abort_transaction(trans, root, ret); |
| 3183 | goto out; |
| 3184 | } |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 3185 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3186 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 3187 | inode_inc_iversion(dir); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3188 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
Josef Bacik | 5a24e84 | 2012-08-08 10:12:59 -0600 | [diff] [blame] | 3189 | ret = btrfs_update_inode_fallback(trans, root, dir); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3190 | if (ret) |
| 3191 | btrfs_abort_transaction(trans, root, ret); |
| 3192 | out: |
Josef Bacik | 71d7aed | 2011-06-14 14:24:32 -0400 | [diff] [blame] | 3193 | btrfs_free_path(path); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3194 | return ret; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3195 | } |
| 3196 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3197 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 3198 | { |
| 3199 | struct inode *inode = dentry->d_inode; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3200 | int err = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3201 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3202 | struct btrfs_trans_handle *trans; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3203 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3204 | |
Chris Mason | 3394e16 | 2008-11-17 20:42:26 -0500 | [diff] [blame] | 3205 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE || |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3206 | btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID) |
Yan | 134d451 | 2007-10-25 15:49:25 -0400 | [diff] [blame] | 3207 | return -ENOTEMPTY; |
| 3208 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3209 | trans = __unlink_start_trans(dir, dentry); |
| 3210 | if (IS_ERR(trans)) |
Josef Bacik | 5df6a9f | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 3211 | return PTR_ERR(trans); |
Josef Bacik | 5df6a9f | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 3212 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3213 | if (unlikely(btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3214 | err = btrfs_unlink_subvol(trans, root, dir, |
| 3215 | BTRFS_I(inode)->location.objectid, |
| 3216 | dentry->d_name.name, |
| 3217 | dentry->d_name.len); |
| 3218 | goto out; |
| 3219 | } |
| 3220 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3221 | err = btrfs_orphan_add(trans, inode); |
| 3222 | if (err) |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3223 | goto out; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3224 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3225 | /* now the directory is empty */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3226 | err = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
| 3227 | dentry->d_name.name, dentry->d_name.len); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3228 | if (!err) |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 3229 | btrfs_i_size_write(inode, 0); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3230 | out: |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3231 | nr = trans->blocks_used; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3232 | __unlink_end_trans(trans, root); |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3233 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3234 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3235 | return err; |
| 3236 | } |
| 3237 | |
Chris Mason | 323ac95 | 2008-10-01 19:05:46 -0400 | [diff] [blame] | 3238 | /* |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3239 | * this can truncate away extent items, csum items and directory items. |
| 3240 | * It starts at a high offset and removes keys until it can't find |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 3241 | * any higher than new_size |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3242 | * |
| 3243 | * csum items that cross the new i_size are truncated to the new size |
| 3244 | * as well. |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3245 | * |
| 3246 | * min_type is the minimum key type to truncate down to. If set to 0, this |
| 3247 | * will kill all the items on this inode, including the INODE_ITEM_KEY. |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3248 | */ |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3249 | int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
| 3250 | struct btrfs_root *root, |
| 3251 | struct inode *inode, |
| 3252 | u64 new_size, u32 min_type) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3253 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3254 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3255 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3256 | struct btrfs_file_extent_item *fi; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3257 | struct btrfs_key key; |
| 3258 | struct btrfs_key found_key; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3259 | u64 extent_start = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3260 | u64 extent_num_bytes = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3261 | u64 extent_offset = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3262 | u64 item_end = 0; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3263 | u64 mask = root->sectorsize - 1; |
| 3264 | u32 found_type = (u8)-1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3265 | int found_extent; |
| 3266 | int del_item; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3267 | int pending_del_nr = 0; |
| 3268 | int pending_del_slot = 0; |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 3269 | int extent_type = -1; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3270 | int ret; |
| 3271 | int err = 0; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3272 | u64 ino = btrfs_ino(inode); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3273 | |
| 3274 | BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3275 | |
Mark Fasheh | 0eb0e19 | 2011-07-12 16:44:10 -0700 | [diff] [blame] | 3276 | path = btrfs_alloc_path(); |
| 3277 | if (!path) |
| 3278 | return -ENOMEM; |
| 3279 | path->reada = -1; |
| 3280 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 3281 | /* |
| 3282 | * We want to drop from the next block forward in case this new size is |
| 3283 | * not block aligned since we will be keeping the last block of the |
| 3284 | * extent just the way it is. |
| 3285 | */ |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3286 | if (root->ref_cows || root == root->fs_info->tree_root) |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 3287 | btrfs_drop_extent_cache(inode, (new_size + mask) & (~mask), (u64)-1, 0); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3288 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 3289 | /* |
| 3290 | * This function is also used to drop the items in the log tree before |
| 3291 | * we relog the inode, so if root != BTRFS_I(inode)->root, it means |
| 3292 | * it is used to drop the loged items. So we shouldn't kill the delayed |
| 3293 | * items. |
| 3294 | */ |
| 3295 | if (min_type == 0 && root == BTRFS_I(inode)->root) |
| 3296 | btrfs_kill_delayed_inode_items(inode); |
| 3297 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3298 | key.objectid = ino; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3299 | key.offset = (u64)-1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3300 | key.type = (u8)-1; |
| 3301 | |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3302 | search_again: |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 3303 | path->leave_spinning = 1; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3304 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3305 | if (ret < 0) { |
| 3306 | err = ret; |
| 3307 | goto out; |
| 3308 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3309 | |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3310 | if (ret > 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3311 | /* there are no items in the tree for us to truncate, we're |
| 3312 | * done |
| 3313 | */ |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3314 | if (path->slots[0] == 0) |
| 3315 | goto out; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3316 | path->slots[0]--; |
| 3317 | } |
| 3318 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3319 | while (1) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3320 | fi = NULL; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3321 | leaf = path->nodes[0]; |
| 3322 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 3323 | found_type = btrfs_key_type(&found_key); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3324 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3325 | if (found_key.objectid != ino) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3326 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3327 | |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3328 | if (found_type < min_type) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3329 | break; |
| 3330 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3331 | item_end = found_key.offset; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3332 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3333 | fi = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3334 | struct btrfs_file_extent_item); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 3335 | extent_type = btrfs_file_extent_type(leaf, fi); |
| 3336 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3337 | item_end += |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3338 | btrfs_file_extent_num_bytes(leaf, fi); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 3339 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 3340 | item_end += btrfs_file_extent_inline_len(leaf, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 3341 | fi); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3342 | } |
Yan | 008630c | 2007-11-07 13:31:09 -0500 | [diff] [blame] | 3343 | item_end--; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3344 | } |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3345 | if (found_type > min_type) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3346 | del_item = 1; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3347 | } else { |
| 3348 | if (item_end < new_size) |
| 3349 | break; |
| 3350 | if (found_key.offset >= new_size) |
| 3351 | del_item = 1; |
| 3352 | else |
| 3353 | del_item = 0; |
| 3354 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3355 | found_extent = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3356 | /* FIXME, shrink the extent if the ref count is only 1 */ |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 3357 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
| 3358 | goto delete; |
| 3359 | |
| 3360 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3361 | u64 num_dec; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3362 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
Miao Xie | f70a9a6b | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 3363 | if (!del_item) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3364 | u64 orig_num_bytes = |
| 3365 | btrfs_file_extent_num_bytes(leaf, fi); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3366 | extent_num_bytes = new_size - |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3367 | found_key.offset + root->sectorsize - 1; |
Yan | b1632b1 | 2008-01-30 11:54:04 -0500 | [diff] [blame] | 3368 | extent_num_bytes = extent_num_bytes & |
| 3369 | ~((u64)root->sectorsize - 1); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3370 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 3371 | extent_num_bytes); |
| 3372 | num_dec = (orig_num_bytes - |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 3373 | extent_num_bytes); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3374 | if (root->ref_cows && extent_start != 0) |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 3375 | inode_sub_bytes(inode, num_dec); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3376 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3377 | } else { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3378 | extent_num_bytes = |
| 3379 | btrfs_file_extent_disk_num_bytes(leaf, |
| 3380 | fi); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3381 | extent_offset = found_key.offset - |
| 3382 | btrfs_file_extent_offset(leaf, fi); |
| 3383 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3384 | /* FIXME blocksize != 4096 */ |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 3385 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3386 | if (extent_start != 0) { |
| 3387 | found_extent = 1; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3388 | if (root->ref_cows) |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 3389 | inode_sub_bytes(inode, num_dec); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3390 | } |
| 3391 | } |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 3392 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 3393 | /* |
| 3394 | * we can't truncate inline items that have had |
| 3395 | * special encodings |
| 3396 | */ |
| 3397 | if (!del_item && |
| 3398 | btrfs_file_extent_compression(leaf, fi) == 0 && |
| 3399 | btrfs_file_extent_encryption(leaf, fi) == 0 && |
| 3400 | btrfs_file_extent_other_encoding(leaf, fi) == 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3401 | u32 size = new_size - found_key.offset; |
| 3402 | |
| 3403 | if (root->ref_cows) { |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 3404 | inode_sub_bytes(inode, item_end + 1 - |
| 3405 | new_size); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3406 | } |
| 3407 | size = |
| 3408 | btrfs_file_extent_calc_inline_size(size); |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 3409 | btrfs_truncate_item(trans, root, path, |
| 3410 | size, 1); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3411 | } else if (root->ref_cows) { |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 3412 | inode_sub_bytes(inode, item_end + 1 - |
| 3413 | found_key.offset); |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 3414 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3415 | } |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 3416 | delete: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3417 | if (del_item) { |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3418 | if (!pending_del_nr) { |
| 3419 | /* no pending yet, add ourselves */ |
| 3420 | pending_del_slot = path->slots[0]; |
| 3421 | pending_del_nr = 1; |
| 3422 | } else if (pending_del_nr && |
| 3423 | path->slots[0] + 1 == pending_del_slot) { |
| 3424 | /* hop on the pending chunk */ |
| 3425 | pending_del_nr++; |
| 3426 | pending_del_slot = path->slots[0]; |
| 3427 | } else { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3428 | BUG(); |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3429 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3430 | } else { |
| 3431 | break; |
| 3432 | } |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3433 | if (found_extent && (root->ref_cows || |
| 3434 | root == root->fs_info->tree_root)) { |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 3435 | btrfs_set_path_blocking(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3436 | ret = btrfs_free_extent(trans, root, extent_start, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3437 | extent_num_bytes, 0, |
| 3438 | btrfs_header_owner(leaf), |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3439 | ino, extent_offset, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3440 | BUG_ON(ret); |
| 3441 | } |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3442 | |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3443 | if (found_type == BTRFS_INODE_ITEM_KEY) |
| 3444 | break; |
| 3445 | |
| 3446 | if (path->slots[0] == 0 || |
| 3447 | path->slots[0] != pending_del_slot) { |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3448 | if (pending_del_nr) { |
| 3449 | ret = btrfs_del_items(trans, root, path, |
| 3450 | pending_del_slot, |
| 3451 | pending_del_nr); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3452 | if (ret) { |
| 3453 | btrfs_abort_transaction(trans, |
| 3454 | root, ret); |
| 3455 | goto error; |
| 3456 | } |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3457 | pending_del_nr = 0; |
| 3458 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3459 | btrfs_release_path(path); |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3460 | goto search_again; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3461 | } else { |
| 3462 | path->slots[0]--; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3463 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3464 | } |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3465 | out: |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3466 | if (pending_del_nr) { |
| 3467 | ret = btrfs_del_items(trans, root, path, pending_del_slot, |
| 3468 | pending_del_nr); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3469 | if (ret) |
| 3470 | btrfs_abort_transaction(trans, root, ret); |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3471 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3472 | error: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3473 | btrfs_free_path(path); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3474 | return err; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3475 | } |
| 3476 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3477 | /* |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame^] | 3478 | * btrfs_truncate_page - read, zero a chunk and write a page |
| 3479 | * @inode - inode that we're zeroing |
| 3480 | * @from - the offset to start zeroing |
| 3481 | * @len - the length to zero, 0 to zero the entire range respective to the |
| 3482 | * offset |
| 3483 | * @front - zero up to the offset instead of from the offset on |
| 3484 | * |
| 3485 | * This will find the page for the "from" offset and cow the page and zero the |
| 3486 | * part we want to zero. This is used with truncate and hole punching. |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3487 | */ |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame^] | 3488 | int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len, |
| 3489 | int front) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3490 | { |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame^] | 3491 | struct address_space *mapping = inode->i_mapping; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3492 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3493 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 3494 | struct btrfs_ordered_extent *ordered; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3495 | struct extent_state *cached_state = NULL; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3496 | char *kaddr; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3497 | u32 blocksize = root->sectorsize; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3498 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
| 3499 | unsigned offset = from & (PAGE_CACHE_SIZE-1); |
| 3500 | struct page *page; |
Josef Bacik | 3b16a4e | 2011-09-21 15:05:58 -0400 | [diff] [blame] | 3501 | gfp_t mask = btrfs_alloc_write_mask(mapping); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3502 | int ret = 0; |
| 3503 | u64 page_start; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3504 | u64 page_end; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3505 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame^] | 3506 | if ((offset & (blocksize - 1)) == 0 && |
| 3507 | (!len || ((len & (blocksize - 1)) == 0))) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3508 | goto out; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3509 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 3510 | if (ret) |
| 3511 | goto out; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3512 | |
| 3513 | ret = -ENOMEM; |
Chris Mason | 211c17f | 2008-05-15 09:13:45 -0400 | [diff] [blame] | 3514 | again: |
Josef Bacik | 3b16a4e | 2011-09-21 15:05:58 -0400 | [diff] [blame] | 3515 | page = find_or_create_page(mapping, index, mask); |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 3516 | if (!page) { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3517 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3518 | goto out; |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 3519 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3520 | |
| 3521 | page_start = page_offset(page); |
| 3522 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
| 3523 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3524 | if (!PageUptodate(page)) { |
| 3525 | ret = btrfs_readpage(NULL, page); |
| 3526 | lock_page(page); |
Chris Mason | 211c17f | 2008-05-15 09:13:45 -0400 | [diff] [blame] | 3527 | if (page->mapping != mapping) { |
| 3528 | unlock_page(page); |
| 3529 | page_cache_release(page); |
| 3530 | goto again; |
| 3531 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3532 | if (!PageUptodate(page)) { |
| 3533 | ret = -EIO; |
Chris Mason | 8964222 | 2008-07-24 09:41:53 -0400 | [diff] [blame] | 3534 | goto out_unlock; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3535 | } |
| 3536 | } |
Chris Mason | 211c17f | 2008-05-15 09:13:45 -0400 | [diff] [blame] | 3537 | wait_on_page_writeback(page); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3538 | |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 3539 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3540 | set_page_extent_mapped(page); |
| 3541 | |
| 3542 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 3543 | if (ordered) { |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3544 | unlock_extent_cached(io_tree, page_start, page_end, |
| 3545 | &cached_state, GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3546 | unlock_page(page); |
| 3547 | page_cache_release(page); |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 3548 | btrfs_start_ordered_extent(inode, ordered, 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3549 | btrfs_put_ordered_extent(ordered); |
| 3550 | goto again; |
| 3551 | } |
| 3552 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3553 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 3554 | EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING, |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3555 | 0, 0, &cached_state, GFP_NOFS); |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 3556 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3557 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
| 3558 | &cached_state); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3559 | if (ret) { |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3560 | unlock_extent_cached(io_tree, page_start, page_end, |
| 3561 | &cached_state, GFP_NOFS); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3562 | goto out_unlock; |
| 3563 | } |
| 3564 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3565 | ret = 0; |
| 3566 | if (offset != PAGE_CACHE_SIZE) { |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame^] | 3567 | if (!len) |
| 3568 | len = PAGE_CACHE_SIZE - offset; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3569 | kaddr = kmap(page); |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame^] | 3570 | if (front) |
| 3571 | memset(kaddr, 0, offset); |
| 3572 | else |
| 3573 | memset(kaddr + offset, 0, len); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3574 | flush_dcache_page(page); |
| 3575 | kunmap(page); |
| 3576 | } |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 3577 | ClearPageChecked(page); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3578 | set_page_dirty(page); |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3579 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, |
| 3580 | GFP_NOFS); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3581 | |
Chris Mason | 8964222 | 2008-07-24 09:41:53 -0400 | [diff] [blame] | 3582 | out_unlock: |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 3583 | if (ret) |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3584 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3585 | unlock_page(page); |
| 3586 | page_cache_release(page); |
| 3587 | out: |
| 3588 | return ret; |
| 3589 | } |
| 3590 | |
Josef Bacik | 695a0d0 | 2011-03-04 15:46:53 -0500 | [diff] [blame] | 3591 | /* |
| 3592 | * This function puts in dummy file extents for the area we're creating a hole |
| 3593 | * for. So if we are truncating this file to a larger size we need to insert |
| 3594 | * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for |
| 3595 | * the range between oldsize and size |
| 3596 | */ |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3597 | int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size) |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3598 | { |
| 3599 | struct btrfs_trans_handle *trans; |
| 3600 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3601 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3602 | struct extent_map *em = NULL; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3603 | struct extent_state *cached_state = NULL; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 3604 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3605 | u64 mask = root->sectorsize - 1; |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3606 | u64 hole_start = (oldsize + mask) & ~mask; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3607 | u64 block_end = (size + mask) & ~mask; |
| 3608 | u64 last_byte; |
| 3609 | u64 cur_offset; |
| 3610 | u64 hole_size; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3611 | int err = 0; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3612 | |
| 3613 | if (size <= hole_start) |
| 3614 | return 0; |
| 3615 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3616 | while (1) { |
| 3617 | struct btrfs_ordered_extent *ordered; |
| 3618 | btrfs_wait_ordered_range(inode, hole_start, |
| 3619 | block_end - hole_start); |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3620 | lock_extent_bits(io_tree, hole_start, block_end - 1, 0, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 3621 | &cached_state); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3622 | ordered = btrfs_lookup_ordered_extent(inode, hole_start); |
| 3623 | if (!ordered) |
| 3624 | break; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3625 | unlock_extent_cached(io_tree, hole_start, block_end - 1, |
| 3626 | &cached_state, GFP_NOFS); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3627 | btrfs_put_ordered_extent(ordered); |
| 3628 | } |
| 3629 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3630 | cur_offset = hole_start; |
| 3631 | while (1) { |
| 3632 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, |
| 3633 | block_end - cur_offset, 0); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3634 | if (IS_ERR(em)) { |
| 3635 | err = PTR_ERR(em); |
| 3636 | break; |
| 3637 | } |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3638 | last_byte = min(extent_map_end(em), block_end); |
| 3639 | last_byte = (last_byte + mask) & ~mask; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3640 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 3641 | struct extent_map *hole_em; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3642 | hole_size = last_byte - cur_offset; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3643 | |
Miao Xie | 3642320 | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 3644 | trans = btrfs_start_transaction(root, 3); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3645 | if (IS_ERR(trans)) { |
| 3646 | err = PTR_ERR(trans); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 3647 | break; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3648 | } |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3649 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 3650 | err = btrfs_drop_extents(trans, root, inode, |
| 3651 | cur_offset, |
Josef Bacik | 2671485 | 2012-08-29 12:24:27 -0400 | [diff] [blame] | 3652 | cur_offset + hole_size, 1); |
Miao Xie | 5b39737 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3653 | if (err) { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3654 | btrfs_abort_transaction(trans, root, err); |
Miao Xie | 5b39737 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3655 | btrfs_end_transaction(trans, root); |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 3656 | break; |
Miao Xie | 5b39737 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3657 | } |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3658 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3659 | err = btrfs_insert_file_extent(trans, root, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3660 | btrfs_ino(inode), cur_offset, 0, |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3661 | 0, hole_size, 0, hole_size, |
| 3662 | 0, 0, 0); |
Miao Xie | 5b39737 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3663 | if (err) { |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 3664 | btrfs_abort_transaction(trans, root, err); |
Miao Xie | 5b39737 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3665 | btrfs_end_transaction(trans, root); |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 3666 | break; |
Miao Xie | 5b39737 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3667 | } |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3668 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 3669 | btrfs_drop_extent_cache(inode, cur_offset, |
| 3670 | cur_offset + hole_size - 1, 0); |
| 3671 | hole_em = alloc_extent_map(); |
| 3672 | if (!hole_em) { |
| 3673 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 3674 | &BTRFS_I(inode)->runtime_flags); |
| 3675 | goto next; |
| 3676 | } |
| 3677 | hole_em->start = cur_offset; |
| 3678 | hole_em->len = hole_size; |
| 3679 | hole_em->orig_start = cur_offset; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3680 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 3681 | hole_em->block_start = EXTENT_MAP_HOLE; |
| 3682 | hole_em->block_len = 0; |
| 3683 | hole_em->bdev = root->fs_info->fs_devices->latest_bdev; |
| 3684 | hole_em->compress_type = BTRFS_COMPRESS_NONE; |
| 3685 | hole_em->generation = trans->transid; |
| 3686 | |
| 3687 | while (1) { |
| 3688 | write_lock(&em_tree->lock); |
| 3689 | err = add_extent_mapping(em_tree, hole_em); |
| 3690 | if (!err) |
| 3691 | list_move(&hole_em->list, |
| 3692 | &em_tree->modified_extents); |
| 3693 | write_unlock(&em_tree->lock); |
| 3694 | if (err != -EEXIST) |
| 3695 | break; |
| 3696 | btrfs_drop_extent_cache(inode, cur_offset, |
| 3697 | cur_offset + |
| 3698 | hole_size - 1, 0); |
| 3699 | } |
| 3700 | free_extent_map(hole_em); |
| 3701 | next: |
Miao Xie | 3642320 | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 3702 | btrfs_update_inode(trans, root, inode); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3703 | btrfs_end_transaction(trans, root); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3704 | } |
| 3705 | free_extent_map(em); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3706 | em = NULL; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3707 | cur_offset = last_byte; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3708 | if (cur_offset >= block_end) |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3709 | break; |
| 3710 | } |
| 3711 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3712 | free_extent_map(em); |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3713 | unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state, |
| 3714 | GFP_NOFS); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3715 | return err; |
| 3716 | } |
| 3717 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3718 | static int btrfs_setsize(struct inode *inode, loff_t newsize) |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3719 | { |
Miao Xie | f4a2f4c | 2011-12-14 20:12:01 -0500 | [diff] [blame] | 3720 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3721 | struct btrfs_trans_handle *trans; |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3722 | loff_t oldsize = i_size_read(inode); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3723 | int ret; |
| 3724 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3725 | if (newsize == oldsize) |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3726 | return 0; |
| 3727 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3728 | if (newsize > oldsize) { |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3729 | truncate_pagecache(inode, oldsize, newsize); |
| 3730 | ret = btrfs_cont_expand(inode, oldsize, newsize); |
Miao Xie | f4a2f4c | 2011-12-14 20:12:01 -0500 | [diff] [blame] | 3731 | if (ret) |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3732 | return ret; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3733 | |
Miao Xie | f4a2f4c | 2011-12-14 20:12:01 -0500 | [diff] [blame] | 3734 | trans = btrfs_start_transaction(root, 1); |
| 3735 | if (IS_ERR(trans)) |
| 3736 | return PTR_ERR(trans); |
| 3737 | |
| 3738 | i_size_write(inode, newsize); |
| 3739 | btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL); |
| 3740 | ret = btrfs_update_inode(trans, root, inode); |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 3741 | btrfs_end_transaction(trans, root); |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3742 | } else { |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3743 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3744 | /* |
| 3745 | * We're truncating a file that used to have good data down to |
| 3746 | * zero. Make sure it gets into the ordered flush list so that |
| 3747 | * any new writes get down to disk quickly. |
| 3748 | */ |
| 3749 | if (newsize == 0) |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 3750 | set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE, |
| 3751 | &BTRFS_I(inode)->runtime_flags); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3752 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3753 | /* we don't support swapfiles, so vmtruncate shouldn't fail */ |
| 3754 | truncate_setsize(inode, newsize); |
| 3755 | ret = btrfs_truncate(inode); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3756 | } |
| 3757 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3758 | return ret; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3759 | } |
| 3760 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3761 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
| 3762 | { |
| 3763 | struct inode *inode = dentry->d_inode; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 3764 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3765 | int err; |
| 3766 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 3767 | if (btrfs_root_readonly(root)) |
| 3768 | return -EROFS; |
| 3769 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3770 | err = inode_change_ok(inode, attr); |
| 3771 | if (err) |
| 3772 | return err; |
| 3773 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 3774 | if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3775 | err = btrfs_setsize(inode, attr->ia_size); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3776 | if (err) |
| 3777 | return err; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3778 | } |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3779 | |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 3780 | if (attr->ia_valid) { |
| 3781 | setattr_copy(inode, attr); |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 3782 | inode_inc_iversion(inode); |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 3783 | err = btrfs_dirty_inode(inode); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 3784 | |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 3785 | if (!err && attr->ia_valid & ATTR_MODE) |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 3786 | err = btrfs_acl_chmod(inode); |
| 3787 | } |
| 3788 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3789 | return err; |
| 3790 | } |
Chris Mason | 61295eb | 2008-01-14 16:24:38 -0500 | [diff] [blame] | 3791 | |
Al Viro | bd55597 | 2010-06-07 11:35:40 -0400 | [diff] [blame] | 3792 | void btrfs_evict_inode(struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3793 | { |
| 3794 | struct btrfs_trans_handle *trans; |
| 3795 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 726c35f | 2011-09-26 15:46:06 -0400 | [diff] [blame] | 3796 | struct btrfs_block_rsv *rsv, *global_rsv; |
Josef Bacik | 0712718 | 2011-08-19 10:29:59 -0400 | [diff] [blame] | 3797 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3798 | unsigned long nr; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3799 | int ret; |
| 3800 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 3801 | trace_btrfs_inode_evict(inode); |
| 3802 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3803 | truncate_inode_pages(&inode->i_data, 0); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3804 | if (inode->i_nlink && (btrfs_root_refs(&root->root_item) != 0 || |
Liu Bo | 83eea1f | 2012-07-10 05:28:39 -0600 | [diff] [blame] | 3805 | btrfs_is_free_space_inode(inode))) |
Al Viro | bd55597 | 2010-06-07 11:35:40 -0400 | [diff] [blame] | 3806 | goto no_delete; |
| 3807 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3808 | if (is_bad_inode(inode)) { |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3809 | btrfs_orphan_del(NULL, inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3810 | goto no_delete; |
| 3811 | } |
Al Viro | bd55597 | 2010-06-07 11:35:40 -0400 | [diff] [blame] | 3812 | /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */ |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 3813 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3814 | |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 3815 | if (root->fs_info->log_root_recovering) { |
Liu Bo | 6bf0231 | 2012-06-25 21:59:09 -0600 | [diff] [blame] | 3816 | BUG_ON(test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
Josef Bacik | 8a35d95 | 2012-05-23 14:26:42 -0400 | [diff] [blame] | 3817 | &BTRFS_I(inode)->runtime_flags)); |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 3818 | goto no_delete; |
| 3819 | } |
| 3820 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3821 | if (inode->i_nlink > 0) { |
| 3822 | BUG_ON(btrfs_root_refs(&root->root_item) != 0); |
| 3823 | goto no_delete; |
| 3824 | } |
| 3825 | |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3826 | rsv = btrfs_alloc_block_rsv(root); |
| 3827 | if (!rsv) { |
| 3828 | btrfs_orphan_del(NULL, inode); |
| 3829 | goto no_delete; |
| 3830 | } |
Josef Bacik | 4a33854 | 2011-08-29 11:01:31 -0400 | [diff] [blame] | 3831 | rsv->size = min_size; |
Josef Bacik | ca7e70f | 2012-08-27 17:48:15 -0400 | [diff] [blame] | 3832 | rsv->failfast = 1; |
Josef Bacik | 726c35f | 2011-09-26 15:46:06 -0400 | [diff] [blame] | 3833 | global_rsv = &root->fs_info->global_block_rsv; |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3834 | |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 3835 | btrfs_i_size_write(inode, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3836 | |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3837 | /* |
| 3838 | * This is a bit simpler than btrfs_truncate since |
| 3839 | * |
| 3840 | * 1) We've already reserved our space for our orphan item in the |
| 3841 | * unlink. |
| 3842 | * 2) We're going to delete the inode item, so we don't need to update |
| 3843 | * it at all. |
| 3844 | * |
| 3845 | * So we just need to reserve some slack space in case we add bytes when |
| 3846 | * doing the truncate. |
| 3847 | */ |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3848 | while (1) { |
Miao Xie | aa38a71 | 2011-11-18 17:43:00 +0800 | [diff] [blame] | 3849 | ret = btrfs_block_rsv_refill_noflush(root, rsv, min_size); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3850 | |
Josef Bacik | 726c35f | 2011-09-26 15:46:06 -0400 | [diff] [blame] | 3851 | /* |
| 3852 | * Try and steal from the global reserve since we will |
| 3853 | * likely not use this space anyway, we want to try as |
| 3854 | * hard as possible to get this to work. |
| 3855 | */ |
| 3856 | if (ret) |
| 3857 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, min_size); |
| 3858 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 3859 | if (ret) { |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3860 | printk(KERN_WARNING "Could not get space for a " |
Josef Bacik | 482e6dc | 2011-08-19 10:31:56 -0400 | [diff] [blame] | 3861 | "delete, will truncate on mount %d\n", ret); |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3862 | btrfs_orphan_del(NULL, inode); |
| 3863 | btrfs_free_block_rsv(root, rsv); |
| 3864 | goto no_delete; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 3865 | } |
| 3866 | |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3867 | trans = btrfs_start_transaction(root, 0); |
| 3868 | if (IS_ERR(trans)) { |
| 3869 | btrfs_orphan_del(NULL, inode); |
| 3870 | btrfs_free_block_rsv(root, rsv); |
| 3871 | goto no_delete; |
| 3872 | } |
| 3873 | |
| 3874 | trans->block_rsv = rsv; |
| 3875 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 3876 | ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0); |
Josef Bacik | ca7e70f | 2012-08-27 17:48:15 -0400 | [diff] [blame] | 3877 | if (ret != -ENOSPC) |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3878 | break; |
| 3879 | |
| 3880 | nr = trans->blocks_used; |
| 3881 | btrfs_end_transaction(trans, root); |
| 3882 | trans = NULL; |
| 3883 | btrfs_btree_balance_dirty(root, nr); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3884 | } |
| 3885 | |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3886 | btrfs_free_block_rsv(root, rsv); |
| 3887 | |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3888 | if (ret == 0) { |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3889 | trans->block_rsv = root->orphan_block_rsv; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3890 | ret = btrfs_orphan_del(trans, inode); |
| 3891 | BUG_ON(ret); |
| 3892 | } |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3893 | |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3894 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 3895 | if (!(root == root->fs_info->tree_root || |
| 3896 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)) |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3897 | btrfs_return_ino(root, btrfs_ino(inode)); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 3898 | |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3899 | nr = trans->blocks_used; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3900 | btrfs_end_transaction(trans, root); |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3901 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3902 | no_delete: |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 3903 | clear_inode(inode); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3904 | return; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3905 | } |
| 3906 | |
| 3907 | /* |
| 3908 | * this returns the key found in the dir entry in the location pointer. |
| 3909 | * If no dir entries were found, location->objectid is 0. |
| 3910 | */ |
| 3911 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
| 3912 | struct btrfs_key *location) |
| 3913 | { |
| 3914 | const char *name = dentry->d_name.name; |
| 3915 | int namelen = dentry->d_name.len; |
| 3916 | struct btrfs_dir_item *di; |
| 3917 | struct btrfs_path *path; |
| 3918 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Yan | 0d9f7f3 | 2007-10-25 15:48:28 -0400 | [diff] [blame] | 3919 | int ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3920 | |
| 3921 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 3922 | if (!path) |
| 3923 | return -ENOMEM; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3924 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3925 | di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(dir), name, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3926 | namelen, 0); |
Yan | 0d9f7f3 | 2007-10-25 15:48:28 -0400 | [diff] [blame] | 3927 | if (IS_ERR(di)) |
| 3928 | ret = PTR_ERR(di); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3929 | |
David Sterba | c704005 | 2011-04-19 18:00:01 +0200 | [diff] [blame] | 3930 | if (IS_ERR_OR_NULL(di)) |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3931 | goto out_err; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3932 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3933 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3934 | out: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3935 | btrfs_free_path(path); |
| 3936 | return ret; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3937 | out_err: |
| 3938 | location->objectid = 0; |
| 3939 | goto out; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3940 | } |
| 3941 | |
| 3942 | /* |
| 3943 | * when we hit a tree root in a directory, the btrfs part of the inode |
| 3944 | * needs to be changed to reflect the root directory of the tree root. This |
| 3945 | * is kind of like crossing a mount point. |
| 3946 | */ |
| 3947 | static int fixup_tree_root_location(struct btrfs_root *root, |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3948 | struct inode *dir, |
| 3949 | struct dentry *dentry, |
| 3950 | struct btrfs_key *location, |
| 3951 | struct btrfs_root **sub_root) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3952 | { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3953 | struct btrfs_path *path; |
| 3954 | struct btrfs_root *new_root; |
| 3955 | struct btrfs_root_ref *ref; |
| 3956 | struct extent_buffer *leaf; |
| 3957 | int ret; |
| 3958 | int err = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3959 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3960 | path = btrfs_alloc_path(); |
| 3961 | if (!path) { |
| 3962 | err = -ENOMEM; |
| 3963 | goto out; |
| 3964 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3965 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3966 | err = -ENOENT; |
| 3967 | ret = btrfs_find_root_ref(root->fs_info->tree_root, path, |
| 3968 | BTRFS_I(dir)->root->root_key.objectid, |
| 3969 | location->objectid); |
| 3970 | if (ret) { |
| 3971 | if (ret < 0) |
| 3972 | err = ret; |
| 3973 | goto out; |
| 3974 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3975 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3976 | leaf = path->nodes[0]; |
| 3977 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3978 | if (btrfs_root_ref_dirid(leaf, ref) != btrfs_ino(dir) || |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3979 | btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len) |
| 3980 | goto out; |
| 3981 | |
| 3982 | ret = memcmp_extent_buffer(leaf, dentry->d_name.name, |
| 3983 | (unsigned long)(ref + 1), |
| 3984 | dentry->d_name.len); |
| 3985 | if (ret) |
| 3986 | goto out; |
| 3987 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3988 | btrfs_release_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3989 | |
| 3990 | new_root = btrfs_read_fs_root_no_name(root->fs_info, location); |
| 3991 | if (IS_ERR(new_root)) { |
| 3992 | err = PTR_ERR(new_root); |
| 3993 | goto out; |
| 3994 | } |
| 3995 | |
| 3996 | if (btrfs_root_refs(&new_root->root_item) == 0) { |
| 3997 | err = -ENOENT; |
| 3998 | goto out; |
| 3999 | } |
| 4000 | |
| 4001 | *sub_root = new_root; |
| 4002 | location->objectid = btrfs_root_dirid(&new_root->root_item); |
| 4003 | location->type = BTRFS_INODE_ITEM_KEY; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4004 | location->offset = 0; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4005 | err = 0; |
| 4006 | out: |
| 4007 | btrfs_free_path(path); |
| 4008 | return err; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4009 | } |
| 4010 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4011 | static void inode_tree_add(struct inode *inode) |
| 4012 | { |
| 4013 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4014 | struct btrfs_inode *entry; |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 4015 | struct rb_node **p; |
| 4016 | struct rb_node *parent; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4017 | u64 ino = btrfs_ino(inode); |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 4018 | again: |
| 4019 | p = &root->inode_tree.rb_node; |
| 4020 | parent = NULL; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4021 | |
Al Viro | 1d3382cb | 2010-10-23 15:19:20 -0400 | [diff] [blame] | 4022 | if (inode_unhashed(inode)) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4023 | return; |
| 4024 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4025 | spin_lock(&root->inode_lock); |
| 4026 | while (*p) { |
| 4027 | parent = *p; |
| 4028 | entry = rb_entry(parent, struct btrfs_inode, rb_node); |
| 4029 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4030 | if (ino < btrfs_ino(&entry->vfs_inode)) |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 4031 | p = &parent->rb_left; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4032 | else if (ino > btrfs_ino(&entry->vfs_inode)) |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 4033 | p = &parent->rb_right; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4034 | else { |
| 4035 | WARN_ON(!(entry->vfs_inode.i_state & |
Al Viro | a4ffdde | 2010-06-02 17:38:30 -0400 | [diff] [blame] | 4036 | (I_WILL_FREE | I_FREEING))); |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 4037 | rb_erase(parent, &root->inode_tree); |
| 4038 | RB_CLEAR_NODE(parent); |
| 4039 | spin_unlock(&root->inode_lock); |
| 4040 | goto again; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4041 | } |
| 4042 | } |
| 4043 | rb_link_node(&BTRFS_I(inode)->rb_node, parent, p); |
| 4044 | rb_insert_color(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
| 4045 | spin_unlock(&root->inode_lock); |
| 4046 | } |
| 4047 | |
| 4048 | static void inode_tree_del(struct inode *inode) |
| 4049 | { |
| 4050 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4051 | int empty = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4052 | |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 4053 | spin_lock(&root->inode_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4054 | if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4055 | rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4056 | RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4057 | empty = RB_EMPTY_ROOT(&root->inode_tree); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4058 | } |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 4059 | spin_unlock(&root->inode_lock); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4060 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4061 | /* |
| 4062 | * Free space cache has inodes in the tree root, but the tree root has a |
| 4063 | * root_refs of 0, so this could end up dropping the tree root as a |
| 4064 | * snapshot, so we need the extra !root->fs_info->tree_root check to |
| 4065 | * make sure we don't drop it. |
| 4066 | */ |
| 4067 | if (empty && btrfs_root_refs(&root->root_item) == 0 && |
| 4068 | root != root->fs_info->tree_root) { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4069 | synchronize_srcu(&root->fs_info->subvol_srcu); |
| 4070 | spin_lock(&root->inode_lock); |
| 4071 | empty = RB_EMPTY_ROOT(&root->inode_tree); |
| 4072 | spin_unlock(&root->inode_lock); |
| 4073 | if (empty) |
| 4074 | btrfs_add_dead_root(root); |
| 4075 | } |
| 4076 | } |
| 4077 | |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 4078 | void btrfs_invalidate_inodes(struct btrfs_root *root) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4079 | { |
| 4080 | struct rb_node *node; |
| 4081 | struct rb_node *prev; |
| 4082 | struct btrfs_inode *entry; |
| 4083 | struct inode *inode; |
| 4084 | u64 objectid = 0; |
| 4085 | |
| 4086 | WARN_ON(btrfs_root_refs(&root->root_item) != 0); |
| 4087 | |
| 4088 | spin_lock(&root->inode_lock); |
| 4089 | again: |
| 4090 | node = root->inode_tree.rb_node; |
| 4091 | prev = NULL; |
| 4092 | while (node) { |
| 4093 | prev = node; |
| 4094 | entry = rb_entry(node, struct btrfs_inode, rb_node); |
| 4095 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4096 | if (objectid < btrfs_ino(&entry->vfs_inode)) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4097 | node = node->rb_left; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4098 | else if (objectid > btrfs_ino(&entry->vfs_inode)) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4099 | node = node->rb_right; |
| 4100 | else |
| 4101 | break; |
| 4102 | } |
| 4103 | if (!node) { |
| 4104 | while (prev) { |
| 4105 | entry = rb_entry(prev, struct btrfs_inode, rb_node); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4106 | if (objectid <= btrfs_ino(&entry->vfs_inode)) { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4107 | node = prev; |
| 4108 | break; |
| 4109 | } |
| 4110 | prev = rb_next(prev); |
| 4111 | } |
| 4112 | } |
| 4113 | while (node) { |
| 4114 | entry = rb_entry(node, struct btrfs_inode, rb_node); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4115 | objectid = btrfs_ino(&entry->vfs_inode) + 1; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4116 | inode = igrab(&entry->vfs_inode); |
| 4117 | if (inode) { |
| 4118 | spin_unlock(&root->inode_lock); |
| 4119 | if (atomic_read(&inode->i_count) > 1) |
| 4120 | d_prune_aliases(inode); |
| 4121 | /* |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 4122 | * btrfs_drop_inode will have it removed from |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4123 | * the inode cache when its usage count |
| 4124 | * hits zero. |
| 4125 | */ |
| 4126 | iput(inode); |
| 4127 | cond_resched(); |
| 4128 | spin_lock(&root->inode_lock); |
| 4129 | goto again; |
| 4130 | } |
| 4131 | |
| 4132 | if (cond_resched_lock(&root->inode_lock)) |
| 4133 | goto again; |
| 4134 | |
| 4135 | node = rb_next(node); |
| 4136 | } |
| 4137 | spin_unlock(&root->inode_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4138 | } |
| 4139 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4140 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
| 4141 | { |
| 4142 | struct btrfs_iget_args *args = p; |
| 4143 | inode->i_ino = args->ino; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4144 | BTRFS_I(inode)->root = args->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4145 | return 0; |
| 4146 | } |
| 4147 | |
| 4148 | static int btrfs_find_actor(struct inode *inode, void *opaque) |
| 4149 | { |
| 4150 | struct btrfs_iget_args *args = opaque; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4151 | return args->ino == btrfs_ino(inode) && |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4152 | args->root == BTRFS_I(inode)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4153 | } |
| 4154 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4155 | static struct inode *btrfs_iget_locked(struct super_block *s, |
| 4156 | u64 objectid, |
| 4157 | struct btrfs_root *root) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4158 | { |
| 4159 | struct inode *inode; |
| 4160 | struct btrfs_iget_args args; |
| 4161 | args.ino = objectid; |
| 4162 | args.root = root; |
| 4163 | |
| 4164 | inode = iget5_locked(s, objectid, btrfs_find_actor, |
| 4165 | btrfs_init_locked_inode, |
| 4166 | (void *)&args); |
| 4167 | return inode; |
| 4168 | } |
| 4169 | |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 4170 | /* Get an inode object given its location and corresponding root. |
| 4171 | * Returns in *is_new if the inode was read from disk |
| 4172 | */ |
| 4173 | struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 4174 | struct btrfs_root *root, int *new) |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 4175 | { |
| 4176 | struct inode *inode; |
| 4177 | |
| 4178 | inode = btrfs_iget_locked(s, location->objectid, root); |
| 4179 | if (!inode) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4180 | return ERR_PTR(-ENOMEM); |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 4181 | |
| 4182 | if (inode->i_state & I_NEW) { |
| 4183 | BTRFS_I(inode)->root = root; |
| 4184 | memcpy(&BTRFS_I(inode)->location, location, sizeof(*location)); |
| 4185 | btrfs_read_locked_inode(inode); |
Mark Fasheh | 1748f84 | 2011-07-12 11:25:31 -0700 | [diff] [blame] | 4186 | if (!is_bad_inode(inode)) { |
| 4187 | inode_tree_add(inode); |
| 4188 | unlock_new_inode(inode); |
| 4189 | if (new) |
| 4190 | *new = 1; |
| 4191 | } else { |
Sergei Trofimovich | e0b6d65 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 4192 | unlock_new_inode(inode); |
| 4193 | iput(inode); |
| 4194 | inode = ERR_PTR(-ESTALE); |
Mark Fasheh | 1748f84 | 2011-07-12 11:25:31 -0700 | [diff] [blame] | 4195 | } |
| 4196 | } |
| 4197 | |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 4198 | return inode; |
| 4199 | } |
| 4200 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4201 | static struct inode *new_simple_dir(struct super_block *s, |
| 4202 | struct btrfs_key *key, |
| 4203 | struct btrfs_root *root) |
| 4204 | { |
| 4205 | struct inode *inode = new_inode(s); |
| 4206 | |
| 4207 | if (!inode) |
| 4208 | return ERR_PTR(-ENOMEM); |
| 4209 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4210 | BTRFS_I(inode)->root = root; |
| 4211 | memcpy(&BTRFS_I(inode)->location, key, sizeof(*key)); |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 4212 | set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4213 | |
| 4214 | inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID; |
Li Zefan | 848cce0 | 2012-02-21 17:04:28 +0800 | [diff] [blame] | 4215 | inode->i_op = &btrfs_dir_ro_inode_operations; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4216 | inode->i_fop = &simple_dir_operations; |
| 4217 | inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO; |
| 4218 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
| 4219 | |
| 4220 | return inode; |
| 4221 | } |
| 4222 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4223 | struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4224 | { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4225 | struct inode *inode; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4226 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4227 | struct btrfs_root *sub_root = root; |
| 4228 | struct btrfs_key location; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4229 | int index; |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 4230 | int ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4231 | |
| 4232 | if (dentry->d_name.len > BTRFS_NAME_LEN) |
| 4233 | return ERR_PTR(-ENAMETOOLONG); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4234 | |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 4235 | if (unlikely(d_need_lookup(dentry))) { |
| 4236 | memcpy(&location, dentry->d_fsdata, sizeof(struct btrfs_key)); |
| 4237 | kfree(dentry->d_fsdata); |
| 4238 | dentry->d_fsdata = NULL; |
Josef Bacik | a66e7cc | 2011-09-18 10:34:03 -0400 | [diff] [blame] | 4239 | /* This thing is hashed, drop it for now */ |
| 4240 | d_drop(dentry); |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 4241 | } else { |
| 4242 | ret = btrfs_inode_by_name(dir, dentry, &location); |
| 4243 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4244 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4245 | if (ret < 0) |
| 4246 | return ERR_PTR(ret); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4247 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4248 | if (location.objectid == 0) |
| 4249 | return NULL; |
| 4250 | |
| 4251 | if (location.type == BTRFS_INODE_ITEM_KEY) { |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 4252 | inode = btrfs_iget(dir->i_sb, &location, root, NULL); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4253 | return inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4254 | } |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4255 | |
| 4256 | BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY); |
| 4257 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4258 | index = srcu_read_lock(&root->fs_info->subvol_srcu); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4259 | ret = fixup_tree_root_location(root, dir, dentry, |
| 4260 | &location, &sub_root); |
| 4261 | if (ret < 0) { |
| 4262 | if (ret != -ENOENT) |
| 4263 | inode = ERR_PTR(ret); |
| 4264 | else |
| 4265 | inode = new_simple_dir(dir->i_sb, &location, sub_root); |
| 4266 | } else { |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 4267 | inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4268 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4269 | srcu_read_unlock(&root->fs_info->subvol_srcu, index); |
| 4270 | |
Julia Lawall | 34d19ba | 2011-01-24 19:55:19 +0000 | [diff] [blame] | 4271 | if (!IS_ERR(inode) && root != sub_root) { |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 4272 | down_read(&root->fs_info->cleanup_work_sem); |
| 4273 | if (!(inode->i_sb->s_flags & MS_RDONLY)) |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 4274 | ret = btrfs_orphan_cleanup(sub_root); |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 4275 | up_read(&root->fs_info->cleanup_work_sem); |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 4276 | if (ret) |
| 4277 | inode = ERR_PTR(ret); |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 4278 | } |
| 4279 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4280 | return inode; |
| 4281 | } |
| 4282 | |
Nick Piggin | fe15ce4 | 2011-01-07 17:49:23 +1100 | [diff] [blame] | 4283 | static int btrfs_dentry_delete(const struct dentry *dentry) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4284 | { |
| 4285 | struct btrfs_root *root; |
Li Zefan | 848cce0 | 2012-02-21 17:04:28 +0800 | [diff] [blame] | 4286 | struct inode *inode = dentry->d_inode; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4287 | |
Li Zefan | 848cce0 | 2012-02-21 17:04:28 +0800 | [diff] [blame] | 4288 | if (!inode && !IS_ROOT(dentry)) |
| 4289 | inode = dentry->d_parent->d_inode; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4290 | |
Li Zefan | 848cce0 | 2012-02-21 17:04:28 +0800 | [diff] [blame] | 4291 | if (inode) { |
| 4292 | root = BTRFS_I(inode)->root; |
Yan, Zheng | efefb14 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 4293 | if (btrfs_root_refs(&root->root_item) == 0) |
| 4294 | return 1; |
Li Zefan | 848cce0 | 2012-02-21 17:04:28 +0800 | [diff] [blame] | 4295 | |
| 4296 | if (btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
| 4297 | return 1; |
Yan, Zheng | efefb14 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 4298 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4299 | return 0; |
| 4300 | } |
| 4301 | |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 4302 | static void btrfs_dentry_release(struct dentry *dentry) |
| 4303 | { |
| 4304 | if (dentry->d_fsdata) |
| 4305 | kfree(dentry->d_fsdata); |
| 4306 | } |
| 4307 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4308 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
Al Viro | 00cd8dd | 2012-06-10 17:13:09 -0400 | [diff] [blame] | 4309 | unsigned int flags) |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4310 | { |
Josef Bacik | a66e7cc | 2011-09-18 10:34:03 -0400 | [diff] [blame] | 4311 | struct dentry *ret; |
| 4312 | |
| 4313 | ret = d_splice_alias(btrfs_lookup_dentry(dir, dentry), dentry); |
| 4314 | if (unlikely(d_need_lookup(dentry))) { |
| 4315 | spin_lock(&dentry->d_lock); |
| 4316 | dentry->d_flags &= ~DCACHE_NEED_LOOKUP; |
| 4317 | spin_unlock(&dentry->d_lock); |
| 4318 | } |
| 4319 | return ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4320 | } |
| 4321 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4322 | unsigned char btrfs_filetype_table[] = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4323 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK |
| 4324 | }; |
| 4325 | |
David Woodhouse | cbdf5a2 | 2008-08-06 19:42:33 +0100 | [diff] [blame] | 4326 | static int btrfs_real_readdir(struct file *filp, void *dirent, |
| 4327 | filldir_t filldir) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4328 | { |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 4329 | struct inode *inode = filp->f_dentry->d_inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4330 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4331 | struct btrfs_item *item; |
| 4332 | struct btrfs_dir_item *di; |
| 4333 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4334 | struct btrfs_key found_key; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4335 | struct btrfs_path *path; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4336 | struct list_head ins_list; |
| 4337 | struct list_head del_list; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4338 | int ret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4339 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4340 | int slot; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4341 | unsigned char d_type; |
| 4342 | int over = 0; |
| 4343 | u32 di_cur; |
| 4344 | u32 di_total; |
| 4345 | u32 di_len; |
| 4346 | int key_type = BTRFS_DIR_INDEX_KEY; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4347 | char tmp_name[32]; |
| 4348 | char *name_ptr; |
| 4349 | int name_len; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4350 | int is_curr = 0; /* filp->f_pos points to the current index? */ |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4351 | |
| 4352 | /* FIXME, use a real flag for deciding about the key type */ |
| 4353 | if (root->fs_info->tree_root == root) |
| 4354 | key_type = BTRFS_DIR_ITEM_KEY; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4355 | |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 4356 | /* special case for "." */ |
| 4357 | if (filp->f_pos == 0) { |
Hidetoshi Seto | 3765fef | 2011-09-18 10:20:46 -0400 | [diff] [blame] | 4358 | over = filldir(dirent, ".", 1, |
| 4359 | filp->f_pos, btrfs_ino(inode), DT_DIR); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 4360 | if (over) |
| 4361 | return 0; |
| 4362 | filp->f_pos = 1; |
| 4363 | } |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 4364 | /* special case for .., just use the back ref */ |
| 4365 | if (filp->f_pos == 1) { |
David Woodhouse | 5ecc7e5 | 2008-08-17 15:14:48 +0100 | [diff] [blame] | 4366 | u64 pino = parent_ino(filp->f_path.dentry); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 4367 | over = filldir(dirent, "..", 2, |
Hidetoshi Seto | 3765fef | 2011-09-18 10:20:46 -0400 | [diff] [blame] | 4368 | filp->f_pos, pino, DT_DIR); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 4369 | if (over) |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4370 | return 0; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 4371 | filp->f_pos = 2; |
| 4372 | } |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4373 | path = btrfs_alloc_path(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4374 | if (!path) |
| 4375 | return -ENOMEM; |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 4376 | |
Josef Bacik | 026fd31 | 2011-05-13 10:32:11 -0400 | [diff] [blame] | 4377 | path->reada = 1; |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4378 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4379 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
| 4380 | INIT_LIST_HEAD(&ins_list); |
| 4381 | INIT_LIST_HEAD(&del_list); |
| 4382 | btrfs_get_delayed_items(inode, &ins_list, &del_list); |
| 4383 | } |
| 4384 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4385 | btrfs_set_key_type(&key, key_type); |
| 4386 | key.offset = filp->f_pos; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4387 | key.objectid = btrfs_ino(inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4388 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4389 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 4390 | if (ret < 0) |
| 4391 | goto err; |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4392 | |
| 4393 | while (1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4394 | leaf = path->nodes[0]; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4395 | slot = path->slots[0]; |
Li Zefan | b9e03af | 2011-03-23 10:43:58 +0800 | [diff] [blame] | 4396 | if (slot >= btrfs_header_nritems(leaf)) { |
| 4397 | ret = btrfs_next_leaf(root, path); |
| 4398 | if (ret < 0) |
| 4399 | goto err; |
| 4400 | else if (ret > 0) |
| 4401 | break; |
| 4402 | continue; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4403 | } |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4404 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4405 | item = btrfs_item_nr(leaf, slot); |
| 4406 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 4407 | |
| 4408 | if (found_key.objectid != key.objectid) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4409 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4410 | if (btrfs_key_type(&found_key) != key_type) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4411 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4412 | if (found_key.offset < filp->f_pos) |
Li Zefan | b9e03af | 2011-03-23 10:43:58 +0800 | [diff] [blame] | 4413 | goto next; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4414 | if (key_type == BTRFS_DIR_INDEX_KEY && |
| 4415 | btrfs_should_delete_dir_index(&del_list, |
| 4416 | found_key.offset)) |
| 4417 | goto next; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4418 | |
| 4419 | filp->f_pos = found_key.offset; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4420 | is_curr = 1; |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4421 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4422 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
| 4423 | di_cur = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4424 | di_total = btrfs_item_size(leaf, item); |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4425 | |
| 4426 | while (di_cur < di_total) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4427 | struct btrfs_key location; |
| 4428 | |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 4429 | if (verify_dir_item(root, leaf, di)) |
| 4430 | break; |
| 4431 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4432 | name_len = btrfs_dir_name_len(leaf, di); |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4433 | if (name_len <= sizeof(tmp_name)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4434 | name_ptr = tmp_name; |
| 4435 | } else { |
| 4436 | name_ptr = kmalloc(name_len, GFP_NOFS); |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4437 | if (!name_ptr) { |
| 4438 | ret = -ENOMEM; |
| 4439 | goto err; |
| 4440 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4441 | } |
| 4442 | read_extent_buffer(leaf, name_ptr, |
| 4443 | (unsigned long)(di + 1), name_len); |
| 4444 | |
| 4445 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; |
| 4446 | btrfs_dir_item_key_to_cpu(leaf, di, &location); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4447 | |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 4448 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4449 | /* is this a reference to our own snapshot? If so |
Arne Jansen | 8c9c2bf | 2012-02-25 09:09:30 +0100 | [diff] [blame] | 4450 | * skip it. |
| 4451 | * |
| 4452 | * In contrast to old kernels, we insert the snapshot's |
| 4453 | * dir item and dir index after it has been created, so |
| 4454 | * we won't find a reference to our own snapshot. We |
| 4455 | * still keep the following code for backward |
| 4456 | * compatibility. |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4457 | */ |
| 4458 | if (location.type == BTRFS_ROOT_ITEM_KEY && |
| 4459 | location.objectid == root->root_key.objectid) { |
| 4460 | over = 0; |
| 4461 | goto skip; |
| 4462 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4463 | over = filldir(dirent, name_ptr, name_len, |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4464 | found_key.offset, location.objectid, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4465 | d_type); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4466 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4467 | skip: |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4468 | if (name_ptr != tmp_name) |
| 4469 | kfree(name_ptr); |
| 4470 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4471 | if (over) |
| 4472 | goto nopos; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 4473 | di_len = btrfs_dir_name_len(leaf, di) + |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4474 | btrfs_dir_data_len(leaf, di) + sizeof(*di); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4475 | di_cur += di_len; |
| 4476 | di = (struct btrfs_dir_item *)((char *)di + di_len); |
| 4477 | } |
Li Zefan | b9e03af | 2011-03-23 10:43:58 +0800 | [diff] [blame] | 4478 | next: |
| 4479 | path->slots[0]++; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4480 | } |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4481 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4482 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
| 4483 | if (is_curr) |
| 4484 | filp->f_pos++; |
| 4485 | ret = btrfs_readdir_delayed_dir_index(filp, dirent, filldir, |
| 4486 | &ins_list); |
| 4487 | if (ret) |
| 4488 | goto nopos; |
| 4489 | } |
| 4490 | |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4491 | /* Reached end of directory/root. Bump pos past the last item. */ |
Yan Zheng | 5e591a0 | 2008-02-19 11:41:02 -0500 | [diff] [blame] | 4492 | if (key_type == BTRFS_DIR_INDEX_KEY) |
Jan Engelhardt | 406266a | 2009-12-09 22:00:38 +0000 | [diff] [blame] | 4493 | /* |
| 4494 | * 32-bit glibc will use getdents64, but then strtol - |
| 4495 | * so the last number we can serve is this. |
| 4496 | */ |
| 4497 | filp->f_pos = 0x7fffffff; |
Yan Zheng | 5e591a0 | 2008-02-19 11:41:02 -0500 | [diff] [blame] | 4498 | else |
| 4499 | filp->f_pos++; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4500 | nopos: |
| 4501 | ret = 0; |
| 4502 | err: |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4503 | if (key_type == BTRFS_DIR_INDEX_KEY) |
| 4504 | btrfs_put_delayed_items(&ins_list, &del_list); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4505 | btrfs_free_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4506 | return ret; |
| 4507 | } |
| 4508 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 4509 | int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4510 | { |
| 4511 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4512 | struct btrfs_trans_handle *trans; |
| 4513 | int ret = 0; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4514 | bool nolock = false; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4515 | |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 4516 | if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags)) |
Chris Mason | 4ca8b41 | 2008-08-05 13:30:48 -0400 | [diff] [blame] | 4517 | return 0; |
| 4518 | |
Liu Bo | 83eea1f | 2012-07-10 05:28:39 -0600 | [diff] [blame] | 4519 | if (btrfs_fs_closing(root->fs_info) && btrfs_is_free_space_inode(inode)) |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 4520 | nolock = true; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4521 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 4522 | if (wbc->sync_mode == WB_SYNC_ALL) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4523 | if (nolock) |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 4524 | trans = btrfs_join_transaction_nolock(root); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4525 | else |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 4526 | trans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 4527 | if (IS_ERR(trans)) |
| 4528 | return PTR_ERR(trans); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4529 | if (nolock) |
| 4530 | ret = btrfs_end_transaction_nolock(trans, root); |
| 4531 | else |
| 4532 | ret = btrfs_commit_transaction(trans, root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4533 | } |
| 4534 | return ret; |
| 4535 | } |
| 4536 | |
| 4537 | /* |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 4538 | * This is somewhat expensive, updating the tree every time the |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4539 | * inode changes. But, it is most likely to find the inode in cache. |
| 4540 | * FIXME, needs more benchmarking...there are no reasons other than performance |
| 4541 | * to keep or drop this code. |
| 4542 | */ |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 4543 | int btrfs_dirty_inode(struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4544 | { |
| 4545 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4546 | struct btrfs_trans_handle *trans; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4547 | int ret; |
| 4548 | |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 4549 | if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags)) |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 4550 | return 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4551 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 4552 | trans = btrfs_join_transaction(root); |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 4553 | if (IS_ERR(trans)) |
| 4554 | return PTR_ERR(trans); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4555 | |
| 4556 | ret = btrfs_update_inode(trans, root, inode); |
Chris Mason | 94b6044 | 2010-05-26 11:02:00 -0400 | [diff] [blame] | 4557 | if (ret && ret == -ENOSPC) { |
| 4558 | /* whoops, lets try again with the full transaction */ |
| 4559 | btrfs_end_transaction(trans, root); |
| 4560 | trans = btrfs_start_transaction(root, 1); |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 4561 | if (IS_ERR(trans)) |
| 4562 | return PTR_ERR(trans); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4563 | |
Chris Mason | 94b6044 | 2010-05-26 11:02:00 -0400 | [diff] [blame] | 4564 | ret = btrfs_update_inode(trans, root, inode); |
Chris Mason | 94b6044 | 2010-05-26 11:02:00 -0400 | [diff] [blame] | 4565 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4566 | btrfs_end_transaction(trans, root); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4567 | if (BTRFS_I(inode)->delayed_node) |
| 4568 | btrfs_balance_delayed_items(root); |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 4569 | |
| 4570 | return ret; |
| 4571 | } |
| 4572 | |
| 4573 | /* |
| 4574 | * This is a copy of file_update_time. We need this so we can return error on |
| 4575 | * ENOSPC for updating the inode in the case of file write and mmap writes. |
| 4576 | */ |
Josef Bacik | e41f941 | 2012-03-26 09:46:47 -0400 | [diff] [blame] | 4577 | static int btrfs_update_time(struct inode *inode, struct timespec *now, |
| 4578 | int flags) |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 4579 | { |
Alexander Block | 2bc556528 | 2012-06-15 09:49:33 +0200 | [diff] [blame] | 4580 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4581 | |
| 4582 | if (btrfs_root_readonly(root)) |
| 4583 | return -EROFS; |
| 4584 | |
Josef Bacik | e41f941 | 2012-03-26 09:46:47 -0400 | [diff] [blame] | 4585 | if (flags & S_VERSION) |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 4586 | inode_inc_iversion(inode); |
Josef Bacik | e41f941 | 2012-03-26 09:46:47 -0400 | [diff] [blame] | 4587 | if (flags & S_CTIME) |
| 4588 | inode->i_ctime = *now; |
| 4589 | if (flags & S_MTIME) |
| 4590 | inode->i_mtime = *now; |
| 4591 | if (flags & S_ATIME) |
| 4592 | inode->i_atime = *now; |
| 4593 | return btrfs_dirty_inode(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4594 | } |
| 4595 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4596 | /* |
| 4597 | * find the highest existing sequence number in a directory |
| 4598 | * and then set the in-memory index_cnt variable to reflect |
| 4599 | * free sequence numbers |
| 4600 | */ |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4601 | static int btrfs_set_inode_index_count(struct inode *inode) |
| 4602 | { |
| 4603 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4604 | struct btrfs_key key, found_key; |
| 4605 | struct btrfs_path *path; |
| 4606 | struct extent_buffer *leaf; |
| 4607 | int ret; |
| 4608 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4609 | key.objectid = btrfs_ino(inode); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4610 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); |
| 4611 | key.offset = (u64)-1; |
| 4612 | |
| 4613 | path = btrfs_alloc_path(); |
| 4614 | if (!path) |
| 4615 | return -ENOMEM; |
| 4616 | |
| 4617 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 4618 | if (ret < 0) |
| 4619 | goto out; |
| 4620 | /* FIXME: we should be able to handle this */ |
| 4621 | if (ret == 0) |
| 4622 | goto out; |
| 4623 | ret = 0; |
| 4624 | |
| 4625 | /* |
| 4626 | * MAGIC NUMBER EXPLANATION: |
| 4627 | * since we search a directory based on f_pos we have to start at 2 |
| 4628 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody |
| 4629 | * else has to start at 2 |
| 4630 | */ |
| 4631 | if (path->slots[0] == 0) { |
| 4632 | BTRFS_I(inode)->index_cnt = 2; |
| 4633 | goto out; |
| 4634 | } |
| 4635 | |
| 4636 | path->slots[0]--; |
| 4637 | |
| 4638 | leaf = path->nodes[0]; |
| 4639 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 4640 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4641 | if (found_key.objectid != btrfs_ino(inode) || |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4642 | btrfs_key_type(&found_key) != BTRFS_DIR_INDEX_KEY) { |
| 4643 | BTRFS_I(inode)->index_cnt = 2; |
| 4644 | goto out; |
| 4645 | } |
| 4646 | |
| 4647 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; |
| 4648 | out: |
| 4649 | btrfs_free_path(path); |
| 4650 | return ret; |
| 4651 | } |
| 4652 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4653 | /* |
| 4654 | * helper to find a free sequence number in a given directory. This current |
| 4655 | * code is very simple, later versions will do smarter things in the btree |
| 4656 | */ |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4657 | int btrfs_set_inode_index(struct inode *dir, u64 *index) |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4658 | { |
| 4659 | int ret = 0; |
| 4660 | |
| 4661 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4662 | ret = btrfs_inode_delayed_dir_index_count(dir); |
| 4663 | if (ret) { |
| 4664 | ret = btrfs_set_inode_index_count(dir); |
| 4665 | if (ret) |
| 4666 | return ret; |
| 4667 | } |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4668 | } |
| 4669 | |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4670 | *index = BTRFS_I(dir)->index_cnt; |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4671 | BTRFS_I(dir)->index_cnt++; |
| 4672 | |
| 4673 | return ret; |
| 4674 | } |
| 4675 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4676 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
| 4677 | struct btrfs_root *root, |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4678 | struct inode *dir, |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4679 | const char *name, int name_len, |
Al Viro | 175a4eb | 2011-07-26 03:30:54 -0400 | [diff] [blame] | 4680 | u64 ref_objectid, u64 objectid, |
| 4681 | umode_t mode, u64 *index) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4682 | { |
| 4683 | struct inode *inode; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4684 | struct btrfs_inode_item *inode_item; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4685 | struct btrfs_key *location; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4686 | struct btrfs_path *path; |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4687 | struct btrfs_inode_ref *ref; |
| 4688 | struct btrfs_key key[2]; |
| 4689 | u32 sizes[2]; |
| 4690 | unsigned long ptr; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4691 | int ret; |
| 4692 | int owner; |
| 4693 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4694 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 4695 | if (!path) |
| 4696 | return ERR_PTR(-ENOMEM); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4697 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4698 | inode = new_inode(root->fs_info->sb); |
Yoshinori Sano | 8fb2764 | 2011-04-09 02:30:07 +0000 | [diff] [blame] | 4699 | if (!inode) { |
| 4700 | btrfs_free_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4701 | return ERR_PTR(-ENOMEM); |
Yoshinori Sano | 8fb2764 | 2011-04-09 02:30:07 +0000 | [diff] [blame] | 4702 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4703 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 4704 | /* |
| 4705 | * we have to initialize this early, so we can reclaim the inode |
| 4706 | * number if we fail afterwards in this function. |
| 4707 | */ |
| 4708 | inode->i_ino = objectid; |
| 4709 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4710 | if (dir) { |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 4711 | trace_btrfs_inode_request(dir); |
| 4712 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4713 | ret = btrfs_set_inode_index(dir, index); |
Shen Feng | 0977143 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 4714 | if (ret) { |
Yoshinori Sano | 8fb2764 | 2011-04-09 02:30:07 +0000 | [diff] [blame] | 4715 | btrfs_free_path(path); |
Shen Feng | 0977143 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 4716 | iput(inode); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4717 | return ERR_PTR(ret); |
Shen Feng | 0977143 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 4718 | } |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4719 | } |
| 4720 | /* |
| 4721 | * index_cnt is ignored for everything but a dir, |
| 4722 | * btrfs_get_inode_index_count has an explanation for the magic |
| 4723 | * number |
| 4724 | */ |
| 4725 | BTRFS_I(inode)->index_cnt = 2; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4726 | BTRFS_I(inode)->root = root; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4727 | BTRFS_I(inode)->generation = trans->transid; |
Josef Bacik | 7619585 | 2010-11-19 02:18:02 +0000 | [diff] [blame] | 4728 | inode->i_generation = BTRFS_I(inode)->generation; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4729 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 4730 | /* |
| 4731 | * We could have gotten an inode number from somebody who was fsynced |
| 4732 | * and then removed in this same transaction, so let's just set full |
| 4733 | * sync since it will be a full sync anyway and this will blow away the |
| 4734 | * old info in the log. |
| 4735 | */ |
| 4736 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); |
| 4737 | |
Al Viro | 569254b | 2011-07-24 17:08:40 -0400 | [diff] [blame] | 4738 | if (S_ISDIR(mode)) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4739 | owner = 0; |
| 4740 | else |
| 4741 | owner = 1; |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4742 | |
| 4743 | key[0].objectid = objectid; |
| 4744 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); |
| 4745 | key[0].offset = 0; |
| 4746 | |
| 4747 | key[1].objectid = objectid; |
| 4748 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); |
| 4749 | key[1].offset = ref_objectid; |
| 4750 | |
| 4751 | sizes[0] = sizeof(struct btrfs_inode_item); |
| 4752 | sizes[1] = name_len + sizeof(*ref); |
| 4753 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 4754 | path->leave_spinning = 1; |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4755 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); |
| 4756 | if (ret != 0) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4757 | goto fail; |
| 4758 | |
Dmitry Monakhov | ecc11fab | 2010-03-04 17:31:47 +0300 | [diff] [blame] | 4759 | inode_init_owner(inode, dir, mode); |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 4760 | inode_set_bytes(inode, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4761 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4762 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 4763 | struct btrfs_inode_item); |
Li Zefan | 293f7e0 | 2012-07-10 00:58:58 -0600 | [diff] [blame] | 4764 | memset_extent_buffer(path->nodes[0], 0, (unsigned long)inode_item, |
| 4765 | sizeof(*inode_item)); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4766 | fill_inode_item(trans, path->nodes[0], inode_item, inode); |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4767 | |
| 4768 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, |
| 4769 | struct btrfs_inode_ref); |
| 4770 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4771 | btrfs_set_inode_ref_index(path->nodes[0], ref, *index); |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4772 | ptr = (unsigned long)(ref + 1); |
| 4773 | write_extent_buffer(path->nodes[0], name, ptr, name_len); |
| 4774 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4775 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 4776 | btrfs_free_path(path); |
| 4777 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4778 | location = &BTRFS_I(inode)->location; |
| 4779 | location->objectid = objectid; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4780 | location->offset = 0; |
| 4781 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
| 4782 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 4783 | btrfs_inherit_iflags(inode, dir); |
| 4784 | |
Al Viro | 569254b | 2011-07-24 17:08:40 -0400 | [diff] [blame] | 4785 | if (S_ISREG(mode)) { |
Chris Mason | 9427216 | 2009-07-02 12:26:06 -0400 | [diff] [blame] | 4786 | if (btrfs_test_opt(root, NODATASUM)) |
| 4787 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 4788 | if (btrfs_test_opt(root, NODATACOW) || |
| 4789 | (BTRFS_I(dir)->flags & BTRFS_INODE_NODATACOW)) |
Chris Mason | 9427216 | 2009-07-02 12:26:06 -0400 | [diff] [blame] | 4790 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
| 4791 | } |
| 4792 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4793 | insert_inode_hash(inode); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4794 | inode_tree_add(inode); |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 4795 | |
| 4796 | trace_btrfs_inode_new(inode); |
Chris Mason | 1973f0f | 2011-06-24 13:13:29 -0400 | [diff] [blame] | 4797 | btrfs_set_inode_last_trans(trans, inode); |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 4798 | |
Alexander Block | 8ea05e3 | 2012-07-25 17:35:53 +0200 | [diff] [blame] | 4799 | btrfs_update_root_times(trans, root); |
| 4800 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4801 | return inode; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4802 | fail: |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4803 | if (dir) |
| 4804 | BTRFS_I(dir)->index_cnt--; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4805 | btrfs_free_path(path); |
Shen Feng | 0977143 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 4806 | iput(inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4807 | return ERR_PTR(ret); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4808 | } |
| 4809 | |
| 4810 | static inline u8 btrfs_inode_type(struct inode *inode) |
| 4811 | { |
| 4812 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; |
| 4813 | } |
| 4814 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4815 | /* |
| 4816 | * utility function to add 'inode' into 'parent_inode' with |
| 4817 | * a give name and a given sequence number. |
| 4818 | * if 'add_backref' is true, also insert a backref from the |
| 4819 | * inode to the parent directory. |
| 4820 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4821 | int btrfs_add_link(struct btrfs_trans_handle *trans, |
| 4822 | struct inode *parent_inode, struct inode *inode, |
| 4823 | const char *name, int name_len, int add_backref, u64 index) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4824 | { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4825 | int ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4826 | struct btrfs_key key; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4827 | struct btrfs_root *root = BTRFS_I(parent_inode)->root; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4828 | u64 ino = btrfs_ino(inode); |
| 4829 | u64 parent_ino = btrfs_ino(parent_inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4830 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4831 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4832 | memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key)); |
| 4833 | } else { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4834 | key.objectid = ino; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4835 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
| 4836 | key.offset = 0; |
| 4837 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4838 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4839 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4840 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
| 4841 | key.objectid, root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4842 | parent_ino, index, name, name_len); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4843 | } else if (add_backref) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4844 | ret = btrfs_insert_inode_ref(trans, root, name, name_len, ino, |
| 4845 | parent_ino, index); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4846 | } |
| 4847 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4848 | /* Nothing to clean up yet */ |
| 4849 | if (ret) |
| 4850 | return ret; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4851 | |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4852 | ret = btrfs_insert_dir_item(trans, root, name, name_len, |
| 4853 | parent_inode, &key, |
| 4854 | btrfs_inode_type(inode), index); |
| 4855 | if (ret == -EEXIST) |
| 4856 | goto fail_dir_item; |
| 4857 | else if (ret) { |
| 4858 | btrfs_abort_transaction(trans, root, ret); |
| 4859 | return ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4860 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4861 | |
| 4862 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
| 4863 | name_len * 2); |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 4864 | inode_inc_iversion(parent_inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 4865 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
| 4866 | ret = btrfs_update_inode(trans, root, parent_inode); |
| 4867 | if (ret) |
| 4868 | btrfs_abort_transaction(trans, root, ret); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4869 | return ret; |
Chris Mason | fe66a05 | 2012-02-20 08:40:56 -0500 | [diff] [blame] | 4870 | |
| 4871 | fail_dir_item: |
| 4872 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
| 4873 | u64 local_index; |
| 4874 | int err; |
| 4875 | err = btrfs_del_root_ref(trans, root->fs_info->tree_root, |
| 4876 | key.objectid, root->root_key.objectid, |
| 4877 | parent_ino, &local_index, name, name_len); |
| 4878 | |
| 4879 | } else if (add_backref) { |
| 4880 | u64 local_index; |
| 4881 | int err; |
| 4882 | |
| 4883 | err = btrfs_del_inode_ref(trans, root, name, name_len, |
| 4884 | ino, parent_ino, &local_index); |
| 4885 | } |
| 4886 | return ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4887 | } |
| 4888 | |
| 4889 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 4890 | struct inode *dir, struct dentry *dentry, |
| 4891 | struct inode *inode, int backref, u64 index) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4892 | { |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 4893 | int err = btrfs_add_link(trans, dir, inode, |
| 4894 | dentry->d_name.name, dentry->d_name.len, |
| 4895 | backref, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4896 | if (err > 0) |
| 4897 | err = -EEXIST; |
| 4898 | return err; |
| 4899 | } |
| 4900 | |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4901 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 4902 | umode_t mode, dev_t rdev) |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4903 | { |
| 4904 | struct btrfs_trans_handle *trans; |
| 4905 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4906 | struct inode *inode = NULL; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4907 | int err; |
| 4908 | int drop_inode = 0; |
| 4909 | u64 objectid; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4910 | unsigned long nr = 0; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4911 | u64 index = 0; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4912 | |
| 4913 | if (!new_valid_dev(rdev)) |
| 4914 | return -EINVAL; |
| 4915 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4916 | /* |
| 4917 | * 2 for inode item and ref |
| 4918 | * 2 for dir items |
| 4919 | * 1 for xattr if selinux is on |
| 4920 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4921 | trans = btrfs_start_transaction(root, 5); |
| 4922 | if (IS_ERR(trans)) |
| 4923 | return PTR_ERR(trans); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4924 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 4925 | err = btrfs_find_free_ino(root, &objectid); |
| 4926 | if (err) |
| 4927 | goto out_unlock; |
| 4928 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4929 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4930 | dentry->d_name.len, btrfs_ino(dir), objectid, |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 4931 | mode, &index); |
Tsutomu Itoh | 7cf96da | 2011-04-25 19:43:53 -0400 | [diff] [blame] | 4932 | if (IS_ERR(inode)) { |
| 4933 | err = PTR_ERR(inode); |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4934 | goto out_unlock; |
Tsutomu Itoh | 7cf96da | 2011-04-25 19:43:53 -0400 | [diff] [blame] | 4935 | } |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4936 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 4937 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 4938 | if (err) { |
| 4939 | drop_inode = 1; |
| 4940 | goto out_unlock; |
| 4941 | } |
| 4942 | |
Casey Schaufler | ad19db7 | 2011-12-15 10:09:07 -0500 | [diff] [blame] | 4943 | /* |
| 4944 | * If the active LSM wants to access the inode during |
| 4945 | * d_instantiate it needs these. Smack checks to see |
| 4946 | * if the filesystem supports xattrs by looking at the |
| 4947 | * ops vector. |
| 4948 | */ |
| 4949 | |
| 4950 | inode->i_op = &btrfs_special_inode_operations; |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 4951 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4952 | if (err) |
| 4953 | drop_inode = 1; |
| 4954 | else { |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4955 | init_special_inode(inode, inode->i_mode, rdev); |
Yan | 1b4ab1b | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 4956 | btrfs_update_inode(trans, root, inode); |
Al Viro | 08c422c | 2011-12-23 07:58:13 -0500 | [diff] [blame] | 4957 | d_instantiate(dentry, inode); |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4958 | } |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4959 | out_unlock: |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 4960 | nr = trans->blocks_used; |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 4961 | btrfs_end_transaction(trans, root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4962 | btrfs_btree_balance_dirty(root, nr); |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4963 | if (drop_inode) { |
| 4964 | inode_dec_link_count(inode); |
| 4965 | iput(inode); |
| 4966 | } |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4967 | return err; |
| 4968 | } |
| 4969 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4970 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
Al Viro | ebfc3b4 | 2012-06-10 18:05:36 -0400 | [diff] [blame] | 4971 | umode_t mode, bool excl) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4972 | { |
| 4973 | struct btrfs_trans_handle *trans; |
| 4974 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4975 | struct inode *inode = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4976 | int drop_inode = 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4977 | int err; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4978 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4979 | u64 objectid; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4980 | u64 index = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4981 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4982 | /* |
| 4983 | * 2 for inode item and ref |
| 4984 | * 2 for dir items |
| 4985 | * 1 for xattr if selinux is on |
| 4986 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4987 | trans = btrfs_start_transaction(root, 5); |
| 4988 | if (IS_ERR(trans)) |
| 4989 | return PTR_ERR(trans); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4990 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 4991 | err = btrfs_find_free_ino(root, &objectid); |
| 4992 | if (err) |
| 4993 | goto out_unlock; |
| 4994 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4995 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4996 | dentry->d_name.len, btrfs_ino(dir), objectid, |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 4997 | mode, &index); |
Tsutomu Itoh | 7cf96da | 2011-04-25 19:43:53 -0400 | [diff] [blame] | 4998 | if (IS_ERR(inode)) { |
| 4999 | err = PTR_ERR(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5000 | goto out_unlock; |
Tsutomu Itoh | 7cf96da | 2011-04-25 19:43:53 -0400 | [diff] [blame] | 5001 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5002 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 5003 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 5004 | if (err) { |
| 5005 | drop_inode = 1; |
| 5006 | goto out_unlock; |
| 5007 | } |
| 5008 | |
Casey Schaufler | ad19db7 | 2011-12-15 10:09:07 -0500 | [diff] [blame] | 5009 | /* |
| 5010 | * If the active LSM wants to access the inode during |
| 5011 | * d_instantiate it needs these. Smack checks to see |
| 5012 | * if the filesystem supports xattrs by looking at the |
| 5013 | * ops vector. |
| 5014 | */ |
| 5015 | inode->i_fop = &btrfs_file_operations; |
| 5016 | inode->i_op = &btrfs_file_inode_operations; |
| 5017 | |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 5018 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5019 | if (err) |
| 5020 | drop_inode = 1; |
| 5021 | else { |
| 5022 | inode->i_mapping->a_ops = &btrfs_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 5023 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5024 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
Al Viro | 08c422c | 2011-12-23 07:58:13 -0500 | [diff] [blame] | 5025 | d_instantiate(dentry, inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5026 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5027 | out_unlock: |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 5028 | nr = trans->blocks_used; |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 5029 | btrfs_end_transaction(trans, root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5030 | if (drop_inode) { |
| 5031 | inode_dec_link_count(inode); |
| 5032 | iput(inode); |
| 5033 | } |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 5034 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5035 | return err; |
| 5036 | } |
| 5037 | |
| 5038 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, |
| 5039 | struct dentry *dentry) |
| 5040 | { |
| 5041 | struct btrfs_trans_handle *trans; |
| 5042 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 5043 | struct inode *inode = old_dentry->d_inode; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 5044 | u64 index; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 5045 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5046 | int err; |
| 5047 | int drop_inode = 0; |
| 5048 | |
TARUISI Hiroaki | 4a8be42 | 2009-11-12 07:14:26 +0000 | [diff] [blame] | 5049 | /* do not allow sys_link's with other subvols of the same device */ |
| 5050 | if (root->objectid != BTRFS_I(inode)->root->objectid) |
Mark Fasheh | 3ab3564 | 2011-03-22 17:20:26 +0000 | [diff] [blame] | 5051 | return -EXDEV; |
TARUISI Hiroaki | 4a8be42 | 2009-11-12 07:14:26 +0000 | [diff] [blame] | 5052 | |
Al Viro | c055e99 | 2011-03-04 17:15:18 +0000 | [diff] [blame] | 5053 | if (inode->i_nlink == ~0U) |
| 5054 | return -EMLINK; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 5055 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 5056 | err = btrfs_set_inode_index(dir, &index); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 5057 | if (err) |
| 5058 | goto fail; |
| 5059 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 5060 | /* |
Miao Xie | 7e6b646 | 2011-02-18 09:21:17 +0000 | [diff] [blame] | 5061 | * 2 items for inode and inode ref |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 5062 | * 2 items for dir items |
Miao Xie | 7e6b646 | 2011-02-18 09:21:17 +0000 | [diff] [blame] | 5063 | * 1 item for parent inode |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 5064 | */ |
Miao Xie | 7e6b646 | 2011-02-18 09:21:17 +0000 | [diff] [blame] | 5065 | trans = btrfs_start_transaction(root, 5); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 5066 | if (IS_ERR(trans)) { |
| 5067 | err = PTR_ERR(trans); |
| 5068 | goto fail; |
| 5069 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5070 | |
Miao Xie | 3153495 | 2011-04-13 13:19:21 +0800 | [diff] [blame] | 5071 | btrfs_inc_nlink(inode); |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 5072 | inode_inc_iversion(inode); |
Miao Xie | 3153495 | 2011-04-13 13:19:21 +0800 | [diff] [blame] | 5073 | inode->i_ctime = CURRENT_TIME; |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 5074 | ihold(inode); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 5075 | |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 5076 | err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5077 | |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 5078 | if (err) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5079 | drop_inode = 1; |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 5080 | } else { |
Al Viro | 10d9f30 | 2011-07-16 23:09:10 -0400 | [diff] [blame] | 5081 | struct dentry *parent = dentry->d_parent; |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 5082 | err = btrfs_update_inode(trans, root, inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5083 | if (err) |
| 5084 | goto fail; |
Al Viro | 08c422c | 2011-12-23 07:58:13 -0500 | [diff] [blame] | 5085 | d_instantiate(dentry, inode); |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 5086 | btrfs_log_new_name(trans, inode, NULL, parent); |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 5087 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5088 | |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 5089 | nr = trans->blocks_used; |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 5090 | btrfs_end_transaction(trans, root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 5091 | fail: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5092 | if (drop_inode) { |
| 5093 | inode_dec_link_count(inode); |
| 5094 | iput(inode); |
| 5095 | } |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 5096 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5097 | return err; |
| 5098 | } |
| 5099 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 5100 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5101 | { |
Chris Mason | b9d8666 | 2008-05-02 16:13:49 -0400 | [diff] [blame] | 5102 | struct inode *inode = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5103 | struct btrfs_trans_handle *trans; |
| 5104 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 5105 | int err = 0; |
| 5106 | int drop_on_err = 0; |
Chris Mason | b9d8666 | 2008-05-02 16:13:49 -0400 | [diff] [blame] | 5107 | u64 objectid = 0; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 5108 | u64 index = 0; |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 5109 | unsigned long nr = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5110 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 5111 | /* |
| 5112 | * 2 items for inode and ref |
| 5113 | * 2 items for dir items |
| 5114 | * 1 for xattr if selinux is on |
| 5115 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 5116 | trans = btrfs_start_transaction(root, 5); |
| 5117 | if (IS_ERR(trans)) |
| 5118 | return PTR_ERR(trans); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5119 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 5120 | err = btrfs_find_free_ino(root, &objectid); |
| 5121 | if (err) |
| 5122 | goto out_fail; |
| 5123 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 5124 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 5125 | dentry->d_name.len, btrfs_ino(dir), objectid, |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 5126 | S_IFDIR | mode, &index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5127 | if (IS_ERR(inode)) { |
| 5128 | err = PTR_ERR(inode); |
| 5129 | goto out_fail; |
| 5130 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5131 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5132 | drop_on_err = 1; |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 5133 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 5134 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 5135 | if (err) |
| 5136 | goto out_fail; |
| 5137 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5138 | inode->i_op = &btrfs_dir_inode_operations; |
| 5139 | inode->i_fop = &btrfs_dir_file_operations; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5140 | |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 5141 | btrfs_i_size_write(inode, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5142 | err = btrfs_update_inode(trans, root, inode); |
| 5143 | if (err) |
| 5144 | goto out_fail; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5145 | |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 5146 | err = btrfs_add_link(trans, dir, inode, dentry->d_name.name, |
| 5147 | dentry->d_name.len, 0, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5148 | if (err) |
| 5149 | goto out_fail; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5150 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5151 | d_instantiate(dentry, inode); |
| 5152 | drop_on_err = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5153 | |
| 5154 | out_fail: |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 5155 | nr = trans->blocks_used; |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 5156 | btrfs_end_transaction(trans, root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5157 | if (drop_on_err) |
| 5158 | iput(inode); |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 5159 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5160 | return err; |
| 5161 | } |
| 5162 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 5163 | /* helper for btfs_get_extent. Given an existing extent in the tree, |
| 5164 | * and an extent that you want to insert, deal with overlap and insert |
| 5165 | * the new extent into the tree. |
| 5166 | */ |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5167 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
| 5168 | struct extent_map *existing, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5169 | struct extent_map *em, |
| 5170 | u64 map_start, u64 map_len) |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5171 | { |
| 5172 | u64 start_diff; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5173 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5174 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
| 5175 | start_diff = map_start - em->start; |
| 5176 | em->start = map_start; |
| 5177 | em->len = map_len; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5178 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
| 5179 | !test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5180 | em->block_start += start_diff; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5181 | em->block_len -= start_diff; |
| 5182 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5183 | return add_extent_mapping(em_tree, em); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5184 | } |
| 5185 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5186 | static noinline int uncompress_inline(struct btrfs_path *path, |
| 5187 | struct inode *inode, struct page *page, |
| 5188 | size_t pg_offset, u64 extent_offset, |
| 5189 | struct btrfs_file_extent_item *item) |
| 5190 | { |
| 5191 | int ret; |
| 5192 | struct extent_buffer *leaf = path->nodes[0]; |
| 5193 | char *tmp; |
| 5194 | size_t max_size; |
| 5195 | unsigned long inline_size; |
| 5196 | unsigned long ptr; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5197 | int compress_type; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5198 | |
| 5199 | WARN_ON(pg_offset != 0); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5200 | compress_type = btrfs_file_extent_compression(leaf, item); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5201 | max_size = btrfs_file_extent_ram_bytes(leaf, item); |
| 5202 | inline_size = btrfs_file_extent_inline_item_len(leaf, |
| 5203 | btrfs_item_nr(leaf, path->slots[0])); |
| 5204 | tmp = kmalloc(inline_size, GFP_NOFS); |
Tsutomu Itoh | 8d41371 | 2011-04-25 19:43:52 -0400 | [diff] [blame] | 5205 | if (!tmp) |
| 5206 | return -ENOMEM; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5207 | ptr = btrfs_file_extent_inline_start(item); |
| 5208 | |
| 5209 | read_extent_buffer(leaf, tmp, ptr, inline_size); |
| 5210 | |
Chris Mason | 5b050f0 | 2008-11-11 09:34:41 -0500 | [diff] [blame] | 5211 | max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5212 | ret = btrfs_decompress(compress_type, tmp, page, |
| 5213 | extent_offset, inline_size, max_size); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5214 | if (ret) { |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 5215 | char *kaddr = kmap_atomic(page); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5216 | unsigned long copy_size = min_t(u64, |
| 5217 | PAGE_CACHE_SIZE - pg_offset, |
| 5218 | max_size - extent_offset); |
| 5219 | memset(kaddr + pg_offset, 0, copy_size); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 5220 | kunmap_atomic(kaddr); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5221 | } |
| 5222 | kfree(tmp); |
| 5223 | return 0; |
| 5224 | } |
| 5225 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 5226 | /* |
| 5227 | * a bit scary, this does extent mapping from logical file offset to the disk. |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5228 | * the ugly parts come from merging extents from the disk with the in-ram |
| 5229 | * representation. This gets more complex because of the data=ordered code, |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 5230 | * where the in-ram extents might be locked pending data=ordered completion. |
| 5231 | * |
| 5232 | * This also copies inline extents directly into the page. |
| 5233 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5234 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5235 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 5236 | size_t pg_offset, u64 start, u64 len, |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5237 | int create) |
| 5238 | { |
| 5239 | int ret; |
| 5240 | int err = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5241 | u64 bytenr; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5242 | u64 extent_start = 0; |
| 5243 | u64 extent_end = 0; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 5244 | u64 objectid = btrfs_ino(inode); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5245 | u32 found_type; |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 5246 | struct btrfs_path *path = NULL; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5247 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5248 | struct btrfs_file_extent_item *item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5249 | struct extent_buffer *leaf; |
| 5250 | struct btrfs_key found_key; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5251 | struct extent_map *em = NULL; |
| 5252 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5253 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5254 | struct btrfs_trans_handle *trans = NULL; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5255 | int compress_type; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5256 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5257 | again: |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 5258 | read_lock(&em_tree->lock); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5259 | em = lookup_extent_mapping(em_tree, start, len); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 5260 | if (em) |
| 5261 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 5262 | read_unlock(&em_tree->lock); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5263 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5264 | if (em) { |
Chris Mason | e1c4b74 | 2008-04-22 13:26:46 -0400 | [diff] [blame] | 5265 | if (em->start > start || em->start + em->len <= start) |
| 5266 | free_extent_map(em); |
| 5267 | else if (em->block_start == EXTENT_MAP_INLINE && page) |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 5268 | free_extent_map(em); |
| 5269 | else |
| 5270 | goto out; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5271 | } |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 5272 | em = alloc_extent_map(); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5273 | if (!em) { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5274 | err = -ENOMEM; |
| 5275 | goto out; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5276 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5277 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5278 | em->start = EXTENT_MAP_HOLE; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 5279 | em->orig_start = EXTENT_MAP_HOLE; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5280 | em->len = (u64)-1; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5281 | em->block_len = (u64)-1; |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 5282 | |
| 5283 | if (!path) { |
| 5284 | path = btrfs_alloc_path(); |
Josef Bacik | 026fd31 | 2011-05-13 10:32:11 -0400 | [diff] [blame] | 5285 | if (!path) { |
| 5286 | err = -ENOMEM; |
| 5287 | goto out; |
| 5288 | } |
| 5289 | /* |
| 5290 | * Chances are we'll be called again, so go ahead and do |
| 5291 | * readahead |
| 5292 | */ |
| 5293 | path->reada = 1; |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 5294 | } |
| 5295 | |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5296 | ret = btrfs_lookup_file_extent(trans, root, path, |
| 5297 | objectid, start, trans != NULL); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5298 | if (ret < 0) { |
| 5299 | err = ret; |
| 5300 | goto out; |
| 5301 | } |
| 5302 | |
| 5303 | if (ret != 0) { |
| 5304 | if (path->slots[0] == 0) |
| 5305 | goto not_found; |
| 5306 | path->slots[0]--; |
| 5307 | } |
| 5308 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5309 | leaf = path->nodes[0]; |
| 5310 | item = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5311 | struct btrfs_file_extent_item); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5312 | /* are we inside the extent that was found? */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5313 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 5314 | found_type = btrfs_key_type(&found_key); |
| 5315 | if (found_key.objectid != objectid || |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5316 | found_type != BTRFS_EXTENT_DATA_KEY) { |
| 5317 | goto not_found; |
| 5318 | } |
| 5319 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5320 | found_type = btrfs_file_extent_type(leaf, item); |
| 5321 | extent_start = found_key.offset; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5322 | compress_type = btrfs_file_extent_compression(leaf, item); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5323 | if (found_type == BTRFS_FILE_EXTENT_REG || |
| 5324 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5325 | extent_end = extent_start + |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5326 | btrfs_file_extent_num_bytes(leaf, item); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5327 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
| 5328 | size_t size; |
| 5329 | size = btrfs_file_extent_inline_len(leaf, item); |
| 5330 | extent_end = (extent_start + size + root->sectorsize - 1) & |
| 5331 | ~((u64)root->sectorsize - 1); |
| 5332 | } |
| 5333 | |
| 5334 | if (start >= extent_end) { |
| 5335 | path->slots[0]++; |
| 5336 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 5337 | ret = btrfs_next_leaf(root, path); |
| 5338 | if (ret < 0) { |
| 5339 | err = ret; |
| 5340 | goto out; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5341 | } |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5342 | if (ret > 0) |
| 5343 | goto not_found; |
| 5344 | leaf = path->nodes[0]; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5345 | } |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5346 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 5347 | if (found_key.objectid != objectid || |
| 5348 | found_key.type != BTRFS_EXTENT_DATA_KEY) |
| 5349 | goto not_found; |
| 5350 | if (start + len <= found_key.offset) |
| 5351 | goto not_found; |
| 5352 | em->start = start; |
| 5353 | em->len = found_key.offset - start; |
| 5354 | goto not_found_em; |
| 5355 | } |
| 5356 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5357 | if (found_type == BTRFS_FILE_EXTENT_REG || |
| 5358 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5359 | em->start = extent_start; |
| 5360 | em->len = extent_end - extent_start; |
Yan Zheng | ff5b7ee | 2008-11-10 07:34:43 -0500 | [diff] [blame] | 5361 | em->orig_start = extent_start - |
| 5362 | btrfs_file_extent_offset(leaf, item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5363 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
| 5364 | if (bytenr == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5365 | em->block_start = EXTENT_MAP_HOLE; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5366 | goto insert; |
| 5367 | } |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5368 | if (compress_type != BTRFS_COMPRESS_NONE) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5369 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5370 | em->compress_type = compress_type; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5371 | em->block_start = bytenr; |
| 5372 | em->block_len = btrfs_file_extent_disk_num_bytes(leaf, |
| 5373 | item); |
| 5374 | } else { |
| 5375 | bytenr += btrfs_file_extent_offset(leaf, item); |
| 5376 | em->block_start = bytenr; |
| 5377 | em->block_len = em->len; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5378 | if (found_type == BTRFS_FILE_EXTENT_PREALLOC) |
| 5379 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5380 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5381 | goto insert; |
| 5382 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5383 | unsigned long ptr; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5384 | char *map; |
Chris Mason | 3326d1b | 2007-10-15 16:18:25 -0400 | [diff] [blame] | 5385 | size_t size; |
| 5386 | size_t extent_offset; |
| 5387 | size_t copy_size; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5388 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5389 | em->block_start = EXTENT_MAP_INLINE; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5390 | if (!page || create) { |
Yan | 689f934 | 2007-10-29 11:41:07 -0400 | [diff] [blame] | 5391 | em->start = extent_start; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5392 | em->len = extent_end - extent_start; |
Yan | 689f934 | 2007-10-29 11:41:07 -0400 | [diff] [blame] | 5393 | goto out; |
| 5394 | } |
| 5395 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5396 | size = btrfs_file_extent_inline_len(leaf, item); |
| 5397 | extent_offset = page_offset(page) + pg_offset - extent_start; |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 5398 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, |
Yan | 689f934 | 2007-10-29 11:41:07 -0400 | [diff] [blame] | 5399 | size - extent_offset); |
Chris Mason | 3326d1b | 2007-10-15 16:18:25 -0400 | [diff] [blame] | 5400 | em->start = extent_start + extent_offset; |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 5401 | em->len = (copy_size + root->sectorsize - 1) & |
| 5402 | ~((u64)root->sectorsize - 1); |
Yan Zheng | ff5b7ee | 2008-11-10 07:34:43 -0500 | [diff] [blame] | 5403 | em->orig_start = EXTENT_MAP_INLINE; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5404 | if (compress_type) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5405 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5406 | em->compress_type = compress_type; |
| 5407 | } |
Yan | 689f934 | 2007-10-29 11:41:07 -0400 | [diff] [blame] | 5408 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5409 | if (create == 0 && !PageUptodate(page)) { |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5410 | if (btrfs_file_extent_compression(leaf, item) != |
| 5411 | BTRFS_COMPRESS_NONE) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5412 | ret = uncompress_inline(path, inode, page, |
| 5413 | pg_offset, |
| 5414 | extent_offset, item); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5415 | BUG_ON(ret); /* -ENOMEM */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5416 | } else { |
| 5417 | map = kmap(page); |
| 5418 | read_extent_buffer(leaf, map + pg_offset, ptr, |
| 5419 | copy_size); |
Chris Mason | 93c82d5 | 2009-09-11 12:36:29 -0400 | [diff] [blame] | 5420 | if (pg_offset + copy_size < PAGE_CACHE_SIZE) { |
| 5421 | memset(map + pg_offset + copy_size, 0, |
| 5422 | PAGE_CACHE_SIZE - pg_offset - |
| 5423 | copy_size); |
| 5424 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5425 | kunmap(page); |
| 5426 | } |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5427 | flush_dcache_page(page); |
| 5428 | } else if (create && PageUptodate(page)) { |
Jan Schmidt | 6bf7e08 | 2011-12-01 14:35:19 +0100 | [diff] [blame] | 5429 | BUG(); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5430 | if (!trans) { |
| 5431 | kunmap(page); |
| 5432 | free_extent_map(em); |
| 5433 | em = NULL; |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 5434 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 5435 | btrfs_release_path(path); |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 5436 | trans = btrfs_join_transaction(root); |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 5437 | |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 5438 | if (IS_ERR(trans)) |
| 5439 | return ERR_CAST(trans); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5440 | goto again; |
| 5441 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5442 | map = kmap(page); |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 5443 | write_extent_buffer(leaf, map + pg_offset, ptr, |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5444 | copy_size); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5445 | kunmap(page); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5446 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5447 | } |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5448 | set_extent_uptodate(io_tree, em->start, |
Arne Jansen | 507903b | 2011-04-06 10:02:20 +0000 | [diff] [blame] | 5449 | extent_map_end(em) - 1, NULL, GFP_NOFS); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5450 | goto insert; |
| 5451 | } else { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5452 | printk(KERN_ERR "btrfs unknown found_type %d\n", found_type); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5453 | WARN_ON(1); |
| 5454 | } |
| 5455 | not_found: |
| 5456 | em->start = start; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5457 | em->len = len; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5458 | not_found_em: |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5459 | em->block_start = EXTENT_MAP_HOLE; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5460 | set_bit(EXTENT_FLAG_VACANCY, &em->flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5461 | insert: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 5462 | btrfs_release_path(path); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5463 | if (em->start > start || extent_map_end(em) <= start) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5464 | printk(KERN_ERR "Btrfs: bad extent! em: [%llu %llu] passed " |
| 5465 | "[%llu %llu]\n", (unsigned long long)em->start, |
| 5466 | (unsigned long long)em->len, |
| 5467 | (unsigned long long)start, |
| 5468 | (unsigned long long)len); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5469 | err = -EIO; |
| 5470 | goto out; |
| 5471 | } |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5472 | |
| 5473 | err = 0; |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 5474 | write_lock(&em_tree->lock); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5475 | ret = add_extent_mapping(em_tree, em); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5476 | /* it is possible that someone inserted the extent into the tree |
| 5477 | * while we had the lock dropped. It is also possible that |
| 5478 | * an overlapping map exists in the tree |
| 5479 | */ |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5480 | if (ret == -EEXIST) { |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5481 | struct extent_map *existing; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5482 | |
| 5483 | ret = 0; |
| 5484 | |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5485 | existing = lookup_extent_mapping(em_tree, start, len); |
Chris Mason | e1c4b74 | 2008-04-22 13:26:46 -0400 | [diff] [blame] | 5486 | if (existing && (existing->start > start || |
| 5487 | existing->start + existing->len <= start)) { |
| 5488 | free_extent_map(existing); |
| 5489 | existing = NULL; |
| 5490 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5491 | if (!existing) { |
| 5492 | existing = lookup_extent_mapping(em_tree, em->start, |
| 5493 | em->len); |
| 5494 | if (existing) { |
| 5495 | err = merge_extent_mapping(em_tree, existing, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5496 | em, start, |
| 5497 | root->sectorsize); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5498 | free_extent_map(existing); |
| 5499 | if (err) { |
| 5500 | free_extent_map(em); |
| 5501 | em = NULL; |
| 5502 | } |
| 5503 | } else { |
| 5504 | err = -EIO; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5505 | free_extent_map(em); |
| 5506 | em = NULL; |
| 5507 | } |
| 5508 | } else { |
| 5509 | free_extent_map(em); |
| 5510 | em = existing; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5511 | err = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5512 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5513 | } |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 5514 | write_unlock(&em_tree->lock); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5515 | out: |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 5516 | |
| 5517 | trace_btrfs_get_extent(root, em); |
| 5518 | |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 5519 | if (path) |
| 5520 | btrfs_free_path(path); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5521 | if (trans) { |
| 5522 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5523 | if (!err) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5524 | err = ret; |
| 5525 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5526 | if (err) { |
| 5527 | free_extent_map(em); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5528 | return ERR_PTR(err); |
| 5529 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 5530 | BUG_ON(!em); /* Error is always set */ |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5531 | return em; |
| 5532 | } |
| 5533 | |
Chris Mason | ec29ed5 | 2011-02-23 16:23:20 -0500 | [diff] [blame] | 5534 | struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page, |
| 5535 | size_t pg_offset, u64 start, u64 len, |
| 5536 | int create) |
| 5537 | { |
| 5538 | struct extent_map *em; |
| 5539 | struct extent_map *hole_em = NULL; |
| 5540 | u64 range_start = start; |
| 5541 | u64 end; |
| 5542 | u64 found; |
| 5543 | u64 found_end; |
| 5544 | int err = 0; |
| 5545 | |
| 5546 | em = btrfs_get_extent(inode, page, pg_offset, start, len, create); |
| 5547 | if (IS_ERR(em)) |
| 5548 | return em; |
| 5549 | if (em) { |
| 5550 | /* |
| 5551 | * if our em maps to a hole, there might |
| 5552 | * actually be delalloc bytes behind it |
| 5553 | */ |
| 5554 | if (em->block_start != EXTENT_MAP_HOLE) |
| 5555 | return em; |
| 5556 | else |
| 5557 | hole_em = em; |
| 5558 | } |
| 5559 | |
| 5560 | /* check to see if we've wrapped (len == -1 or similar) */ |
| 5561 | end = start + len; |
| 5562 | if (end < start) |
| 5563 | end = (u64)-1; |
| 5564 | else |
| 5565 | end -= 1; |
| 5566 | |
| 5567 | em = NULL; |
| 5568 | |
| 5569 | /* ok, we didn't find anything, lets look for delalloc */ |
| 5570 | found = count_range_bits(&BTRFS_I(inode)->io_tree, &range_start, |
| 5571 | end, len, EXTENT_DELALLOC, 1); |
| 5572 | found_end = range_start + found; |
| 5573 | if (found_end < range_start) |
| 5574 | found_end = (u64)-1; |
| 5575 | |
| 5576 | /* |
| 5577 | * we didn't find anything useful, return |
| 5578 | * the original results from get_extent() |
| 5579 | */ |
| 5580 | if (range_start > end || found_end <= start) { |
| 5581 | em = hole_em; |
| 5582 | hole_em = NULL; |
| 5583 | goto out; |
| 5584 | } |
| 5585 | |
| 5586 | /* adjust the range_start to make sure it doesn't |
| 5587 | * go backwards from the start they passed in |
| 5588 | */ |
| 5589 | range_start = max(start,range_start); |
| 5590 | found = found_end - range_start; |
| 5591 | |
| 5592 | if (found > 0) { |
| 5593 | u64 hole_start = start; |
| 5594 | u64 hole_len = len; |
| 5595 | |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 5596 | em = alloc_extent_map(); |
Chris Mason | ec29ed5 | 2011-02-23 16:23:20 -0500 | [diff] [blame] | 5597 | if (!em) { |
| 5598 | err = -ENOMEM; |
| 5599 | goto out; |
| 5600 | } |
| 5601 | /* |
| 5602 | * when btrfs_get_extent can't find anything it |
| 5603 | * returns one huge hole |
| 5604 | * |
| 5605 | * make sure what it found really fits our range, and |
| 5606 | * adjust to make sure it is based on the start from |
| 5607 | * the caller |
| 5608 | */ |
| 5609 | if (hole_em) { |
| 5610 | u64 calc_end = extent_map_end(hole_em); |
| 5611 | |
| 5612 | if (calc_end <= start || (hole_em->start > end)) { |
| 5613 | free_extent_map(hole_em); |
| 5614 | hole_em = NULL; |
| 5615 | } else { |
| 5616 | hole_start = max(hole_em->start, start); |
| 5617 | hole_len = calc_end - hole_start; |
| 5618 | } |
| 5619 | } |
| 5620 | em->bdev = NULL; |
| 5621 | if (hole_em && range_start > hole_start) { |
| 5622 | /* our hole starts before our delalloc, so we |
| 5623 | * have to return just the parts of the hole |
| 5624 | * that go until the delalloc starts |
| 5625 | */ |
| 5626 | em->len = min(hole_len, |
| 5627 | range_start - hole_start); |
| 5628 | em->start = hole_start; |
| 5629 | em->orig_start = hole_start; |
| 5630 | /* |
| 5631 | * don't adjust block start at all, |
| 5632 | * it is fixed at EXTENT_MAP_HOLE |
| 5633 | */ |
| 5634 | em->block_start = hole_em->block_start; |
| 5635 | em->block_len = hole_len; |
| 5636 | } else { |
| 5637 | em->start = range_start; |
| 5638 | em->len = found; |
| 5639 | em->orig_start = range_start; |
| 5640 | em->block_start = EXTENT_MAP_DELALLOC; |
| 5641 | em->block_len = found; |
| 5642 | } |
| 5643 | } else if (hole_em) { |
| 5644 | return hole_em; |
| 5645 | } |
| 5646 | out: |
| 5647 | |
| 5648 | free_extent_map(hole_em); |
| 5649 | if (err) { |
| 5650 | free_extent_map(em); |
| 5651 | return ERR_PTR(err); |
| 5652 | } |
| 5653 | return em; |
| 5654 | } |
| 5655 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5656 | static struct extent_map *btrfs_new_extent_direct(struct inode *inode, |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5657 | struct extent_map *em, |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5658 | u64 start, u64 len) |
| 5659 | { |
| 5660 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5661 | struct btrfs_trans_handle *trans; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5662 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 5663 | struct btrfs_key ins; |
| 5664 | u64 alloc_hint; |
| 5665 | int ret; |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5666 | bool insert = false; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5667 | |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5668 | /* |
| 5669 | * Ok if the extent map we looked up is a hole and is for the exact |
| 5670 | * range we want, there is no reason to allocate a new one, however if |
| 5671 | * it is not right then we need to free this one and drop the cache for |
| 5672 | * our range. |
| 5673 | */ |
| 5674 | if (em->block_start != EXTENT_MAP_HOLE || em->start != start || |
| 5675 | em->len != len) { |
| 5676 | free_extent_map(em); |
| 5677 | em = NULL; |
| 5678 | insert = true; |
| 5679 | btrfs_drop_extent_cache(inode, start, start + len - 1, 0); |
| 5680 | } |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5681 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 5682 | trans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 5683 | if (IS_ERR(trans)) |
| 5684 | return ERR_CAST(trans); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5685 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 5686 | if (start <= BTRFS_I(inode)->disk_i_size && len < 64 * 1024) |
| 5687 | btrfs_add_inode_defrag(trans, inode); |
| 5688 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5689 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
| 5690 | |
| 5691 | alloc_hint = get_extent_allocation_hint(inode, start, len); |
| 5692 | ret = btrfs_reserve_extent(trans, root, len, root->sectorsize, 0, |
Josef Bacik | 81c9ad2 | 2012-01-18 10:56:06 -0500 | [diff] [blame] | 5693 | alloc_hint, &ins, 1); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5694 | if (ret) { |
| 5695 | em = ERR_PTR(ret); |
| 5696 | goto out; |
| 5697 | } |
| 5698 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5699 | if (!em) { |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 5700 | em = alloc_extent_map(); |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5701 | if (!em) { |
| 5702 | em = ERR_PTR(-ENOMEM); |
| 5703 | goto out; |
| 5704 | } |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5705 | } |
| 5706 | |
| 5707 | em->start = start; |
| 5708 | em->orig_start = em->start; |
| 5709 | em->len = ins.offset; |
| 5710 | |
| 5711 | em->block_start = ins.objectid; |
| 5712 | em->block_len = ins.offset; |
| 5713 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5714 | |
| 5715 | /* |
| 5716 | * We need to do this because if we're using the original em we searched |
| 5717 | * for, we could have EXTENT_FLAG_VACANCY set, and we don't want that. |
| 5718 | */ |
| 5719 | em->flags = 0; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5720 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
| 5721 | |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5722 | while (insert) { |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5723 | write_lock(&em_tree->lock); |
| 5724 | ret = add_extent_mapping(em_tree, em); |
| 5725 | write_unlock(&em_tree->lock); |
| 5726 | if (ret != -EEXIST) |
| 5727 | break; |
| 5728 | btrfs_drop_extent_cache(inode, start, start + em->len - 1, 0); |
| 5729 | } |
| 5730 | |
| 5731 | ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid, |
| 5732 | ins.offset, ins.offset, 0); |
| 5733 | if (ret) { |
| 5734 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset); |
| 5735 | em = ERR_PTR(ret); |
| 5736 | } |
| 5737 | out: |
| 5738 | btrfs_end_transaction(trans, root); |
| 5739 | return em; |
| 5740 | } |
| 5741 | |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5742 | /* |
| 5743 | * returns 1 when the nocow is safe, < 1 on error, 0 if the |
| 5744 | * block must be cow'd |
| 5745 | */ |
| 5746 | static noinline int can_nocow_odirect(struct btrfs_trans_handle *trans, |
| 5747 | struct inode *inode, u64 offset, u64 len) |
| 5748 | { |
| 5749 | struct btrfs_path *path; |
| 5750 | int ret; |
| 5751 | struct extent_buffer *leaf; |
| 5752 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5753 | struct btrfs_file_extent_item *fi; |
| 5754 | struct btrfs_key key; |
| 5755 | u64 disk_bytenr; |
| 5756 | u64 backref_offset; |
| 5757 | u64 extent_end; |
| 5758 | u64 num_bytes; |
| 5759 | int slot; |
| 5760 | int found_type; |
| 5761 | |
| 5762 | path = btrfs_alloc_path(); |
| 5763 | if (!path) |
| 5764 | return -ENOMEM; |
| 5765 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 5766 | ret = btrfs_lookup_file_extent(trans, root, path, btrfs_ino(inode), |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5767 | offset, 0); |
| 5768 | if (ret < 0) |
| 5769 | goto out; |
| 5770 | |
| 5771 | slot = path->slots[0]; |
| 5772 | if (ret == 1) { |
| 5773 | if (slot == 0) { |
| 5774 | /* can't find the item, must cow */ |
| 5775 | ret = 0; |
| 5776 | goto out; |
| 5777 | } |
| 5778 | slot--; |
| 5779 | } |
| 5780 | ret = 0; |
| 5781 | leaf = path->nodes[0]; |
| 5782 | btrfs_item_key_to_cpu(leaf, &key, slot); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 5783 | if (key.objectid != btrfs_ino(inode) || |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5784 | key.type != BTRFS_EXTENT_DATA_KEY) { |
| 5785 | /* not our file or wrong item type, must cow */ |
| 5786 | goto out; |
| 5787 | } |
| 5788 | |
| 5789 | if (key.offset > offset) { |
| 5790 | /* Wrong offset, must cow */ |
| 5791 | goto out; |
| 5792 | } |
| 5793 | |
| 5794 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); |
| 5795 | found_type = btrfs_file_extent_type(leaf, fi); |
| 5796 | if (found_type != BTRFS_FILE_EXTENT_REG && |
| 5797 | found_type != BTRFS_FILE_EXTENT_PREALLOC) { |
| 5798 | /* not a regular extent, must cow */ |
| 5799 | goto out; |
| 5800 | } |
| 5801 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 5802 | backref_offset = btrfs_file_extent_offset(leaf, fi); |
| 5803 | |
| 5804 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
| 5805 | if (extent_end < offset + len) { |
| 5806 | /* extent doesn't include our full range, must cow */ |
| 5807 | goto out; |
| 5808 | } |
| 5809 | |
| 5810 | if (btrfs_extent_readonly(root, disk_bytenr)) |
| 5811 | goto out; |
| 5812 | |
| 5813 | /* |
| 5814 | * look for other files referencing this extent, if we |
| 5815 | * find any we must cow |
| 5816 | */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 5817 | if (btrfs_cross_ref_exist(trans, root, btrfs_ino(inode), |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5818 | key.offset - backref_offset, disk_bytenr)) |
| 5819 | goto out; |
| 5820 | |
| 5821 | /* |
| 5822 | * adjust disk_bytenr and num_bytes to cover just the bytes |
| 5823 | * in this extent we are about to write. If there |
| 5824 | * are any csums in that range we have to cow in order |
| 5825 | * to keep the csums correct |
| 5826 | */ |
| 5827 | disk_bytenr += backref_offset; |
| 5828 | disk_bytenr += offset - key.offset; |
| 5829 | num_bytes = min(offset + len, extent_end) - offset; |
| 5830 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) |
| 5831 | goto out; |
| 5832 | /* |
| 5833 | * all of the above have passed, it is safe to overwrite this extent |
| 5834 | * without cow |
| 5835 | */ |
| 5836 | ret = 1; |
| 5837 | out: |
| 5838 | btrfs_free_path(path); |
| 5839 | return ret; |
| 5840 | } |
| 5841 | |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 5842 | static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend, |
| 5843 | struct extent_state **cached_state, int writing) |
| 5844 | { |
| 5845 | struct btrfs_ordered_extent *ordered; |
| 5846 | int ret = 0; |
| 5847 | |
| 5848 | while (1) { |
| 5849 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
| 5850 | 0, cached_state); |
| 5851 | /* |
| 5852 | * We're concerned with the entire range that we're going to be |
| 5853 | * doing DIO to, so we need to make sure theres no ordered |
| 5854 | * extents in this range. |
| 5855 | */ |
| 5856 | ordered = btrfs_lookup_ordered_range(inode, lockstart, |
| 5857 | lockend - lockstart + 1); |
| 5858 | |
| 5859 | /* |
| 5860 | * We need to make sure there are no buffered pages in this |
| 5861 | * range either, we could have raced between the invalidate in |
| 5862 | * generic_file_direct_write and locking the extent. The |
| 5863 | * invalidate needs to happen so that reads after a write do not |
| 5864 | * get stale data. |
| 5865 | */ |
| 5866 | if (!ordered && (!writing || |
| 5867 | !test_range_bit(&BTRFS_I(inode)->io_tree, |
| 5868 | lockstart, lockend, EXTENT_UPTODATE, 0, |
| 5869 | *cached_state))) |
| 5870 | break; |
| 5871 | |
| 5872 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
| 5873 | cached_state, GFP_NOFS); |
| 5874 | |
| 5875 | if (ordered) { |
| 5876 | btrfs_start_ordered_extent(inode, ordered, 1); |
| 5877 | btrfs_put_ordered_extent(ordered); |
| 5878 | } else { |
| 5879 | /* Screw you mmap */ |
| 5880 | ret = filemap_write_and_wait_range(inode->i_mapping, |
| 5881 | lockstart, |
| 5882 | lockend); |
| 5883 | if (ret) |
| 5884 | break; |
| 5885 | |
| 5886 | /* |
| 5887 | * If we found a page that couldn't be invalidated just |
| 5888 | * fall back to buffered. |
| 5889 | */ |
| 5890 | ret = invalidate_inode_pages2_range(inode->i_mapping, |
| 5891 | lockstart >> PAGE_CACHE_SHIFT, |
| 5892 | lockend >> PAGE_CACHE_SHIFT); |
| 5893 | if (ret) |
| 5894 | break; |
| 5895 | } |
| 5896 | |
| 5897 | cond_resched(); |
| 5898 | } |
| 5899 | |
| 5900 | return ret; |
| 5901 | } |
| 5902 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5903 | static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, |
| 5904 | struct buffer_head *bh_result, int create) |
| 5905 | { |
| 5906 | struct extent_map *em; |
| 5907 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 5908 | struct extent_state *cached_state = NULL; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5909 | u64 start = iblock << inode->i_blkbits; |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 5910 | u64 lockstart, lockend; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5911 | u64 len = bh_result->b_size; |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5912 | struct btrfs_trans_handle *trans; |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 5913 | int unlock_bits = EXTENT_LOCKED; |
| 5914 | int ret; |
| 5915 | |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 5916 | if (create) { |
| 5917 | ret = btrfs_delalloc_reserve_space(inode, len); |
| 5918 | if (ret) |
| 5919 | return ret; |
| 5920 | unlock_bits |= EXTENT_DELALLOC | EXTENT_DIRTY; |
Josef Bacik | c329861 | 2012-08-03 16:49:19 -0400 | [diff] [blame] | 5921 | } else { |
| 5922 | len = min_t(u64, len, root->sectorsize); |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 5923 | } |
| 5924 | |
Josef Bacik | c329861 | 2012-08-03 16:49:19 -0400 | [diff] [blame] | 5925 | lockstart = start; |
| 5926 | lockend = start + len - 1; |
| 5927 | |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 5928 | /* |
| 5929 | * If this errors out it's because we couldn't invalidate pagecache for |
| 5930 | * this range and we need to fallback to buffered. |
| 5931 | */ |
| 5932 | if (lock_extent_direct(inode, lockstart, lockend, &cached_state, create)) |
| 5933 | return -ENOTBLK; |
| 5934 | |
| 5935 | if (create) { |
| 5936 | ret = set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, |
| 5937 | lockend, EXTENT_DELALLOC, NULL, |
| 5938 | &cached_state, GFP_NOFS); |
| 5939 | if (ret) |
| 5940 | goto unlock_err; |
| 5941 | } |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5942 | |
| 5943 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 5944 | if (IS_ERR(em)) { |
| 5945 | ret = PTR_ERR(em); |
| 5946 | goto unlock_err; |
| 5947 | } |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5948 | |
| 5949 | /* |
| 5950 | * Ok for INLINE and COMPRESSED extents we need to fallback on buffered |
| 5951 | * io. INLINE is special, and we could probably kludge it in here, but |
| 5952 | * it's still buffered so for safety lets just fall back to the generic |
| 5953 | * buffered path. |
| 5954 | * |
| 5955 | * For COMPRESSED we _have_ to read the entire extent in so we can |
| 5956 | * decompress it, so there will be buffering required no matter what we |
| 5957 | * do, so go ahead and fallback to buffered. |
| 5958 | * |
| 5959 | * We return -ENOTBLK because thats what makes DIO go ahead and go back |
| 5960 | * to buffered IO. Don't blame me, this is the price we pay for using |
| 5961 | * the generic code. |
| 5962 | */ |
| 5963 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) || |
| 5964 | em->block_start == EXTENT_MAP_INLINE) { |
| 5965 | free_extent_map(em); |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 5966 | ret = -ENOTBLK; |
| 5967 | goto unlock_err; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5968 | } |
| 5969 | |
| 5970 | /* Just a good old fashioned hole, return */ |
| 5971 | if (!create && (em->block_start == EXTENT_MAP_HOLE || |
| 5972 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { |
| 5973 | free_extent_map(em); |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 5974 | ret = 0; |
| 5975 | goto unlock_err; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5976 | } |
| 5977 | |
| 5978 | /* |
| 5979 | * We don't allocate a new extent in the following cases |
| 5980 | * |
| 5981 | * 1) The inode is marked as NODATACOW. In this case we'll just use the |
| 5982 | * existing extent. |
| 5983 | * 2) The extent is marked as PREALLOC. We're good to go here and can |
| 5984 | * just use the extent. |
| 5985 | * |
| 5986 | */ |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5987 | if (!create) { |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 5988 | len = min(len, em->len - (start - em->start)); |
| 5989 | lockstart = start + len; |
| 5990 | goto unlock; |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5991 | } |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5992 | |
| 5993 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) || |
| 5994 | ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) && |
| 5995 | em->block_start != EXTENT_MAP_HOLE)) { |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5996 | int type; |
| 5997 | int ret; |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5998 | u64 block_start; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5999 | |
| 6000 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
| 6001 | type = BTRFS_ORDERED_PREALLOC; |
| 6002 | else |
| 6003 | type = BTRFS_ORDERED_NOCOW; |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 6004 | len = min(len, em->len - (start - em->start)); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6005 | block_start = em->block_start + (start - em->start); |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 6006 | |
| 6007 | /* |
| 6008 | * we're not going to log anything, but we do need |
| 6009 | * to make sure the current transaction stays open |
| 6010 | * while we look for nocow cross refs |
| 6011 | */ |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 6012 | trans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 6013 | if (IS_ERR(trans)) |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 6014 | goto must_cow; |
| 6015 | |
| 6016 | if (can_nocow_odirect(trans, inode, start, len) == 1) { |
| 6017 | ret = btrfs_add_ordered_extent_dio(inode, start, |
| 6018 | block_start, len, len, type); |
| 6019 | btrfs_end_transaction(trans, root); |
| 6020 | if (ret) { |
| 6021 | free_extent_map(em); |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 6022 | goto unlock_err; |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 6023 | } |
| 6024 | goto unlock; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6025 | } |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 6026 | btrfs_end_transaction(trans, root); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6027 | } |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 6028 | must_cow: |
| 6029 | /* |
| 6030 | * this will cow the extent, reset the len in case we changed |
| 6031 | * it above |
| 6032 | */ |
| 6033 | len = bh_result->b_size; |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 6034 | em = btrfs_new_extent_direct(inode, em, start, len); |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 6035 | if (IS_ERR(em)) { |
| 6036 | ret = PTR_ERR(em); |
| 6037 | goto unlock_err; |
| 6038 | } |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 6039 | len = min(len, em->len - (start - em->start)); |
| 6040 | unlock: |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6041 | bh_result->b_blocknr = (em->block_start + (start - em->start)) >> |
| 6042 | inode->i_blkbits; |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 6043 | bh_result->b_size = len; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6044 | bh_result->b_bdev = em->bdev; |
| 6045 | set_buffer_mapped(bh_result); |
Josef Bacik | c3473e8 | 2012-06-19 10:59:00 -0400 | [diff] [blame] | 6046 | if (create) { |
| 6047 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
| 6048 | set_buffer_new(bh_result); |
| 6049 | |
| 6050 | /* |
| 6051 | * Need to update the i_size under the extent lock so buffered |
| 6052 | * readers will get the updated i_size when we unlock. |
| 6053 | */ |
| 6054 | if (start + len > i_size_read(inode)) |
| 6055 | i_size_write(inode, start + len); |
| 6056 | } |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6057 | |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 6058 | /* |
| 6059 | * In the case of write we need to clear and unlock the entire range, |
| 6060 | * in the case of read we need to unlock only the end area that we |
| 6061 | * aren't using if there is any left over space. |
| 6062 | */ |
Liu Bo | 24c03fa | 2012-08-22 20:10:38 -0600 | [diff] [blame] | 6063 | if (lockstart < lockend) { |
| 6064 | if (create && len < lockend - lockstart) { |
| 6065 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, |
| 6066 | lockstart + len - 1, unlock_bits, 1, 0, |
| 6067 | &cached_state, GFP_NOFS); |
| 6068 | /* |
| 6069 | * Beside unlock, we also need to cleanup reserved space |
| 6070 | * for the left range by attaching EXTENT_DO_ACCOUNTING. |
| 6071 | */ |
| 6072 | clear_extent_bit(&BTRFS_I(inode)->io_tree, |
| 6073 | lockstart + len, lockend, |
| 6074 | unlock_bits | EXTENT_DO_ACCOUNTING, |
| 6075 | 1, 0, NULL, GFP_NOFS); |
| 6076 | } else { |
| 6077 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, |
| 6078 | lockend, unlock_bits, 1, 0, |
| 6079 | &cached_state, GFP_NOFS); |
| 6080 | } |
| 6081 | } else { |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 6082 | free_extent_state(cached_state); |
Liu Bo | 24c03fa | 2012-08-22 20:10:38 -0600 | [diff] [blame] | 6083 | } |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 6084 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6085 | free_extent_map(em); |
| 6086 | |
| 6087 | return 0; |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 6088 | |
| 6089 | unlock_err: |
| 6090 | if (create) |
| 6091 | unlock_bits |= EXTENT_DO_ACCOUNTING; |
| 6092 | |
| 6093 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
| 6094 | unlock_bits, 1, 0, &cached_state, GFP_NOFS); |
| 6095 | return ret; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6096 | } |
| 6097 | |
| 6098 | struct btrfs_dio_private { |
| 6099 | struct inode *inode; |
| 6100 | u64 logical_offset; |
| 6101 | u64 disk_bytenr; |
| 6102 | u64 bytes; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6103 | void *private; |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6104 | |
| 6105 | /* number of bios pending for this dio */ |
| 6106 | atomic_t pending_bios; |
| 6107 | |
| 6108 | /* IO errors */ |
| 6109 | int errors; |
| 6110 | |
| 6111 | struct bio *orig_bio; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6112 | }; |
| 6113 | |
| 6114 | static void btrfs_endio_direct_read(struct bio *bio, int err) |
| 6115 | { |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6116 | struct btrfs_dio_private *dip = bio->bi_private; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6117 | struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1; |
| 6118 | struct bio_vec *bvec = bio->bi_io_vec; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6119 | struct inode *inode = dip->inode; |
| 6120 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 6121 | u64 start; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6122 | |
| 6123 | start = dip->logical_offset; |
| 6124 | do { |
| 6125 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) { |
| 6126 | struct page *page = bvec->bv_page; |
| 6127 | char *kaddr; |
| 6128 | u32 csum = ~(u32)0; |
Josef Bacik | c329861 | 2012-08-03 16:49:19 -0400 | [diff] [blame] | 6129 | u64 private = ~(u32)0; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6130 | unsigned long flags; |
| 6131 | |
Josef Bacik | c329861 | 2012-08-03 16:49:19 -0400 | [diff] [blame] | 6132 | if (get_state_private(&BTRFS_I(inode)->io_tree, |
| 6133 | start, &private)) |
| 6134 | goto failed; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6135 | local_irq_save(flags); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 6136 | kaddr = kmap_atomic(page); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6137 | csum = btrfs_csum_data(root, kaddr + bvec->bv_offset, |
| 6138 | csum, bvec->bv_len); |
| 6139 | btrfs_csum_final(csum, (char *)&csum); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 6140 | kunmap_atomic(kaddr); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6141 | local_irq_restore(flags); |
| 6142 | |
| 6143 | flush_dcache_page(bvec->bv_page); |
Josef Bacik | c329861 | 2012-08-03 16:49:19 -0400 | [diff] [blame] | 6144 | if (csum != private) { |
| 6145 | failed: |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 6146 | printk(KERN_ERR "btrfs csum failed ino %llu off" |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6147 | " %llu csum %u private %u\n", |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 6148 | (unsigned long long)btrfs_ino(inode), |
| 6149 | (unsigned long long)start, |
Josef Bacik | c329861 | 2012-08-03 16:49:19 -0400 | [diff] [blame] | 6150 | csum, (unsigned)private); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6151 | err = -EIO; |
| 6152 | } |
| 6153 | } |
| 6154 | |
| 6155 | start += bvec->bv_len; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6156 | bvec++; |
| 6157 | } while (bvec <= bvec_end); |
| 6158 | |
| 6159 | unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset, |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 6160 | dip->logical_offset + dip->bytes - 1); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6161 | bio->bi_private = dip->private; |
| 6162 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6163 | kfree(dip); |
Josef Bacik | c0da7aa | 2011-03-22 11:05:07 -0400 | [diff] [blame] | 6164 | |
| 6165 | /* If we had a csum failure make sure to clear the uptodate flag */ |
| 6166 | if (err) |
| 6167 | clear_bit(BIO_UPTODATE, &bio->bi_flags); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6168 | dio_end_io(bio, err); |
| 6169 | } |
| 6170 | |
| 6171 | static void btrfs_endio_direct_write(struct bio *bio, int err) |
| 6172 | { |
| 6173 | struct btrfs_dio_private *dip = bio->bi_private; |
| 6174 | struct inode *inode = dip->inode; |
| 6175 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6176 | struct btrfs_ordered_extent *ordered = NULL; |
Chris Mason | 163cf09 | 2010-11-28 19:56:33 -0500 | [diff] [blame] | 6177 | u64 ordered_offset = dip->logical_offset; |
| 6178 | u64 ordered_bytes = dip->bytes; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6179 | int ret; |
| 6180 | |
| 6181 | if (err) |
| 6182 | goto out_done; |
Chris Mason | 163cf09 | 2010-11-28 19:56:33 -0500 | [diff] [blame] | 6183 | again: |
| 6184 | ret = btrfs_dec_test_first_ordered_pending(inode, &ordered, |
| 6185 | &ordered_offset, |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 6186 | ordered_bytes, !err); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6187 | if (!ret) |
Chris Mason | 163cf09 | 2010-11-28 19:56:33 -0500 | [diff] [blame] | 6188 | goto out_test; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6189 | |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 6190 | ordered->work.func = finish_ordered_fn; |
| 6191 | ordered->work.flags = 0; |
| 6192 | btrfs_queue_worker(&root->fs_info->endio_write_workers, |
| 6193 | &ordered->work); |
Chris Mason | 163cf09 | 2010-11-28 19:56:33 -0500 | [diff] [blame] | 6194 | out_test: |
| 6195 | /* |
| 6196 | * our bio might span multiple ordered extents. If we haven't |
| 6197 | * completed the accounting for the whole dio, go back and try again |
| 6198 | */ |
| 6199 | if (ordered_offset < dip->logical_offset + dip->bytes) { |
| 6200 | ordered_bytes = dip->logical_offset + dip->bytes - |
| 6201 | ordered_offset; |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 6202 | ordered = NULL; |
Chris Mason | 163cf09 | 2010-11-28 19:56:33 -0500 | [diff] [blame] | 6203 | goto again; |
| 6204 | } |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6205 | out_done: |
| 6206 | bio->bi_private = dip->private; |
| 6207 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6208 | kfree(dip); |
Josef Bacik | c0da7aa | 2011-03-22 11:05:07 -0400 | [diff] [blame] | 6209 | |
| 6210 | /* If we had an error make sure to clear the uptodate flag */ |
| 6211 | if (err) |
| 6212 | clear_bit(BIO_UPTODATE, &bio->bi_flags); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6213 | dio_end_io(bio, err); |
| 6214 | } |
| 6215 | |
Chris Mason | eaf25d9 | 2010-05-25 09:48:28 -0400 | [diff] [blame] | 6216 | static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw, |
| 6217 | struct bio *bio, int mirror_num, |
| 6218 | unsigned long bio_flags, u64 offset) |
| 6219 | { |
| 6220 | int ret; |
| 6221 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 6222 | ret = btrfs_csum_one_bio(root, inode, bio, offset, 1); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 6223 | BUG_ON(ret); /* -ENOMEM */ |
Chris Mason | eaf25d9 | 2010-05-25 09:48:28 -0400 | [diff] [blame] | 6224 | return 0; |
| 6225 | } |
| 6226 | |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6227 | static void btrfs_end_dio_bio(struct bio *bio, int err) |
| 6228 | { |
| 6229 | struct btrfs_dio_private *dip = bio->bi_private; |
| 6230 | |
| 6231 | if (err) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 6232 | printk(KERN_ERR "btrfs direct IO failed ino %llu rw %lu " |
Jan Beulich | 3dd1462 | 2010-12-07 14:54:09 +0000 | [diff] [blame] | 6233 | "sector %#Lx len %u err no %d\n", |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 6234 | (unsigned long long)btrfs_ino(dip->inode), bio->bi_rw, |
Jan Beulich | 3dd1462 | 2010-12-07 14:54:09 +0000 | [diff] [blame] | 6235 | (unsigned long long)bio->bi_sector, bio->bi_size, err); |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6236 | dip->errors = 1; |
| 6237 | |
| 6238 | /* |
| 6239 | * before atomic variable goto zero, we must make sure |
| 6240 | * dip->errors is perceived to be set. |
| 6241 | */ |
| 6242 | smp_mb__before_atomic_dec(); |
| 6243 | } |
| 6244 | |
| 6245 | /* if there are more bios still pending for this dio, just exit */ |
| 6246 | if (!atomic_dec_and_test(&dip->pending_bios)) |
| 6247 | goto out; |
| 6248 | |
| 6249 | if (dip->errors) |
| 6250 | bio_io_error(dip->orig_bio); |
| 6251 | else { |
| 6252 | set_bit(BIO_UPTODATE, &dip->orig_bio->bi_flags); |
| 6253 | bio_endio(dip->orig_bio, 0); |
| 6254 | } |
| 6255 | out: |
| 6256 | bio_put(bio); |
| 6257 | } |
| 6258 | |
| 6259 | static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev, |
| 6260 | u64 first_sector, gfp_t gfp_flags) |
| 6261 | { |
| 6262 | int nr_vecs = bio_get_nr_vecs(bdev); |
| 6263 | return btrfs_bio_alloc(bdev, first_sector, nr_vecs, gfp_flags); |
| 6264 | } |
| 6265 | |
| 6266 | static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, |
| 6267 | int rw, u64 file_offset, int skip_sum, |
Josef Bacik | c329861 | 2012-08-03 16:49:19 -0400 | [diff] [blame] | 6268 | int async_submit) |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6269 | { |
| 6270 | int write = rw & REQ_WRITE; |
| 6271 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 6272 | int ret; |
| 6273 | |
| 6274 | bio_get(bio); |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 6275 | |
| 6276 | if (!write) { |
| 6277 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); |
| 6278 | if (ret) |
| 6279 | goto err; |
| 6280 | } |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6281 | |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 6282 | if (skip_sum) |
| 6283 | goto map; |
| 6284 | |
| 6285 | if (write && async_submit) { |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6286 | ret = btrfs_wq_submit_bio(root->fs_info, |
| 6287 | inode, rw, bio, 0, 0, |
| 6288 | file_offset, |
| 6289 | __btrfs_submit_bio_start_direct_io, |
| 6290 | __btrfs_submit_bio_done); |
| 6291 | goto err; |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 6292 | } else if (write) { |
| 6293 | /* |
| 6294 | * If we aren't doing async submit, calculate the csum of the |
| 6295 | * bio now. |
| 6296 | */ |
| 6297 | ret = btrfs_csum_one_bio(root, inode, bio, file_offset, 1); |
| 6298 | if (ret) |
| 6299 | goto err; |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 6300 | } else if (!skip_sum) { |
Josef Bacik | c329861 | 2012-08-03 16:49:19 -0400 | [diff] [blame] | 6301 | ret = btrfs_lookup_bio_sums_dio(root, inode, bio, file_offset); |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 6302 | if (ret) |
| 6303 | goto err; |
| 6304 | } |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6305 | |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 6306 | map: |
| 6307 | ret = btrfs_map_bio(root, rw, bio, 0, async_submit); |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6308 | err: |
| 6309 | bio_put(bio); |
| 6310 | return ret; |
| 6311 | } |
| 6312 | |
| 6313 | static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip, |
| 6314 | int skip_sum) |
| 6315 | { |
| 6316 | struct inode *inode = dip->inode; |
| 6317 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 6318 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; |
| 6319 | struct bio *bio; |
| 6320 | struct bio *orig_bio = dip->orig_bio; |
| 6321 | struct bio_vec *bvec = orig_bio->bi_io_vec; |
| 6322 | u64 start_sector = orig_bio->bi_sector; |
| 6323 | u64 file_offset = dip->logical_offset; |
| 6324 | u64 submit_len = 0; |
| 6325 | u64 map_length; |
| 6326 | int nr_pages = 0; |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6327 | int ret = 0; |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 6328 | int async_submit = 0; |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6329 | |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6330 | map_length = orig_bio->bi_size; |
| 6331 | ret = btrfs_map_block(map_tree, READ, start_sector << 9, |
| 6332 | &map_length, NULL, 0); |
| 6333 | if (ret) { |
Josef Bacik | 64728bb | 2011-04-25 19:43:52 -0400 | [diff] [blame] | 6334 | bio_put(orig_bio); |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6335 | return -EIO; |
| 6336 | } |
| 6337 | |
Josef Bacik | 02f57c7 | 2011-04-06 14:25:44 -0400 | [diff] [blame] | 6338 | if (map_length >= orig_bio->bi_size) { |
| 6339 | bio = orig_bio; |
| 6340 | goto submit; |
| 6341 | } |
| 6342 | |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 6343 | async_submit = 1; |
Josef Bacik | 02f57c7 | 2011-04-06 14:25:44 -0400 | [diff] [blame] | 6344 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS); |
| 6345 | if (!bio) |
| 6346 | return -ENOMEM; |
| 6347 | bio->bi_private = dip; |
| 6348 | bio->bi_end_io = btrfs_end_dio_bio; |
| 6349 | atomic_inc(&dip->pending_bios); |
| 6350 | |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6351 | while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) { |
| 6352 | if (unlikely(map_length < submit_len + bvec->bv_len || |
| 6353 | bio_add_page(bio, bvec->bv_page, bvec->bv_len, |
| 6354 | bvec->bv_offset) < bvec->bv_len)) { |
| 6355 | /* |
| 6356 | * inc the count before we submit the bio so |
| 6357 | * we know the end IO handler won't happen before |
| 6358 | * we inc the count. Otherwise, the dip might get freed |
| 6359 | * before we're done setting it up |
| 6360 | */ |
| 6361 | atomic_inc(&dip->pending_bios); |
| 6362 | ret = __btrfs_submit_dio_bio(bio, inode, rw, |
| 6363 | file_offset, skip_sum, |
Josef Bacik | c329861 | 2012-08-03 16:49:19 -0400 | [diff] [blame] | 6364 | async_submit); |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6365 | if (ret) { |
| 6366 | bio_put(bio); |
| 6367 | atomic_dec(&dip->pending_bios); |
| 6368 | goto out_err; |
| 6369 | } |
| 6370 | |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6371 | start_sector += submit_len >> 9; |
| 6372 | file_offset += submit_len; |
| 6373 | |
| 6374 | submit_len = 0; |
| 6375 | nr_pages = 0; |
| 6376 | |
| 6377 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, |
| 6378 | start_sector, GFP_NOFS); |
| 6379 | if (!bio) |
| 6380 | goto out_err; |
| 6381 | bio->bi_private = dip; |
| 6382 | bio->bi_end_io = btrfs_end_dio_bio; |
| 6383 | |
| 6384 | map_length = orig_bio->bi_size; |
| 6385 | ret = btrfs_map_block(map_tree, READ, start_sector << 9, |
| 6386 | &map_length, NULL, 0); |
| 6387 | if (ret) { |
| 6388 | bio_put(bio); |
| 6389 | goto out_err; |
| 6390 | } |
| 6391 | } else { |
| 6392 | submit_len += bvec->bv_len; |
| 6393 | nr_pages ++; |
| 6394 | bvec++; |
| 6395 | } |
| 6396 | } |
| 6397 | |
Josef Bacik | 02f57c7 | 2011-04-06 14:25:44 -0400 | [diff] [blame] | 6398 | submit: |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6399 | ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum, |
Josef Bacik | c329861 | 2012-08-03 16:49:19 -0400 | [diff] [blame] | 6400 | async_submit); |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6401 | if (!ret) |
| 6402 | return 0; |
| 6403 | |
| 6404 | bio_put(bio); |
| 6405 | out_err: |
| 6406 | dip->errors = 1; |
| 6407 | /* |
| 6408 | * before atomic variable goto zero, we must |
| 6409 | * make sure dip->errors is perceived to be set. |
| 6410 | */ |
| 6411 | smp_mb__before_atomic_dec(); |
| 6412 | if (atomic_dec_and_test(&dip->pending_bios)) |
| 6413 | bio_io_error(dip->orig_bio); |
| 6414 | |
| 6415 | /* bio_end_io() will handle error, so we needn't return it */ |
| 6416 | return 0; |
| 6417 | } |
| 6418 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6419 | static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode, |
| 6420 | loff_t file_offset) |
| 6421 | { |
| 6422 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 6423 | struct btrfs_dio_private *dip; |
| 6424 | struct bio_vec *bvec = bio->bi_io_vec; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6425 | int skip_sum; |
Christoph Hellwig | 7b6d91d | 2010-08-07 18:20:39 +0200 | [diff] [blame] | 6426 | int write = rw & REQ_WRITE; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6427 | int ret = 0; |
| 6428 | |
| 6429 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
| 6430 | |
| 6431 | dip = kmalloc(sizeof(*dip), GFP_NOFS); |
| 6432 | if (!dip) { |
| 6433 | ret = -ENOMEM; |
| 6434 | goto free_ordered; |
| 6435 | } |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6436 | |
| 6437 | dip->private = bio->bi_private; |
| 6438 | dip->inode = inode; |
| 6439 | dip->logical_offset = file_offset; |
| 6440 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6441 | dip->bytes = 0; |
| 6442 | do { |
| 6443 | dip->bytes += bvec->bv_len; |
| 6444 | bvec++; |
| 6445 | } while (bvec <= (bio->bi_io_vec + bio->bi_vcnt - 1)); |
| 6446 | |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 6447 | dip->disk_bytenr = (u64)bio->bi_sector << 9; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6448 | bio->bi_private = dip; |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6449 | dip->errors = 0; |
| 6450 | dip->orig_bio = bio; |
| 6451 | atomic_set(&dip->pending_bios, 0); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6452 | |
| 6453 | if (write) |
| 6454 | bio->bi_end_io = btrfs_endio_direct_write; |
| 6455 | else |
| 6456 | bio->bi_end_io = btrfs_endio_direct_read; |
| 6457 | |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6458 | ret = btrfs_submit_direct_hook(rw, dip, skip_sum); |
| 6459 | if (!ret) |
Chris Mason | eaf25d9 | 2010-05-25 09:48:28 -0400 | [diff] [blame] | 6460 | return; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6461 | free_ordered: |
| 6462 | /* |
| 6463 | * If this is a write, we need to clean up the reserved space and kill |
| 6464 | * the ordered extent. |
| 6465 | */ |
| 6466 | if (write) { |
| 6467 | struct btrfs_ordered_extent *ordered; |
Josef Bacik | 955256f | 2010-11-19 09:41:10 -0500 | [diff] [blame] | 6468 | ordered = btrfs_lookup_ordered_extent(inode, file_offset); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6469 | if (!test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags) && |
| 6470 | !test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags)) |
| 6471 | btrfs_free_reserved_extent(root, ordered->start, |
| 6472 | ordered->disk_len); |
| 6473 | btrfs_put_ordered_extent(ordered); |
| 6474 | btrfs_put_ordered_extent(ordered); |
| 6475 | } |
| 6476 | bio_endio(bio, ret); |
| 6477 | } |
| 6478 | |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6479 | static ssize_t check_direct_IO(struct btrfs_root *root, int rw, struct kiocb *iocb, |
| 6480 | const struct iovec *iov, loff_t offset, |
| 6481 | unsigned long nr_segs) |
| 6482 | { |
| 6483 | int seg; |
Josef Bacik | a1b75f7 | 2011-04-08 15:51:18 +0000 | [diff] [blame] | 6484 | int i; |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6485 | size_t size; |
| 6486 | unsigned long addr; |
| 6487 | unsigned blocksize_mask = root->sectorsize - 1; |
| 6488 | ssize_t retval = -EINVAL; |
| 6489 | loff_t end = offset; |
| 6490 | |
| 6491 | if (offset & blocksize_mask) |
| 6492 | goto out; |
| 6493 | |
| 6494 | /* Check the memory alignment. Blocks cannot straddle pages */ |
| 6495 | for (seg = 0; seg < nr_segs; seg++) { |
| 6496 | addr = (unsigned long)iov[seg].iov_base; |
| 6497 | size = iov[seg].iov_len; |
| 6498 | end += size; |
Josef Bacik | a1b75f7 | 2011-04-08 15:51:18 +0000 | [diff] [blame] | 6499 | if ((addr & blocksize_mask) || (size & blocksize_mask)) |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6500 | goto out; |
Josef Bacik | a1b75f7 | 2011-04-08 15:51:18 +0000 | [diff] [blame] | 6501 | |
| 6502 | /* If this is a write we don't need to check anymore */ |
| 6503 | if (rw & WRITE) |
| 6504 | continue; |
| 6505 | |
| 6506 | /* |
| 6507 | * Check to make sure we don't have duplicate iov_base's in this |
| 6508 | * iovec, if so return EINVAL, otherwise we'll get csum errors |
| 6509 | * when reading back. |
| 6510 | */ |
| 6511 | for (i = seg + 1; i < nr_segs; i++) { |
| 6512 | if (iov[seg].iov_base == iov[i].iov_base) |
| 6513 | goto out; |
| 6514 | } |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6515 | } |
| 6516 | retval = 0; |
| 6517 | out: |
| 6518 | return retval; |
| 6519 | } |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 6520 | |
Chris Mason | 1643298 | 2008-04-10 10:23:21 -0400 | [diff] [blame] | 6521 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, |
| 6522 | const struct iovec *iov, loff_t offset, |
| 6523 | unsigned long nr_segs) |
| 6524 | { |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6525 | struct file *file = iocb->ki_filp; |
| 6526 | struct inode *inode = file->f_mapping->host; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6527 | |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6528 | if (check_direct_IO(BTRFS_I(inode)->root, rw, iocb, iov, |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 6529 | offset, nr_segs)) |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6530 | return 0; |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6531 | |
Josef Bacik | eb838e7 | 2012-07-31 16:28:48 -0400 | [diff] [blame] | 6532 | return __blockdev_direct_IO(rw, iocb, inode, |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6533 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev, |
| 6534 | iov, offset, nr_segs, btrfs_get_blocks_direct, NULL, |
| 6535 | btrfs_submit_direct, 0); |
Chris Mason | 1643298 | 2008-04-10 10:23:21 -0400 | [diff] [blame] | 6536 | } |
| 6537 | |
Yehuda Sadeh | 1506fcc | 2009-01-21 14:39:14 -0500 | [diff] [blame] | 6538 | static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| 6539 | __u64 start, __u64 len) |
| 6540 | { |
Chris Mason | ec29ed5 | 2011-02-23 16:23:20 -0500 | [diff] [blame] | 6541 | return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent_fiemap); |
Yehuda Sadeh | 1506fcc | 2009-01-21 14:39:14 -0500 | [diff] [blame] | 6542 | } |
| 6543 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6544 | int btrfs_readpage(struct file *file, struct page *page) |
| 6545 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6546 | struct extent_io_tree *tree; |
| 6547 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
Jan Schmidt | 8ddc7d9 | 2011-06-13 20:02:58 +0200 | [diff] [blame] | 6548 | return extent_read_full_page(tree, page, btrfs_get_extent, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6549 | } |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 6550 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6551 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
| 6552 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6553 | struct extent_io_tree *tree; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6554 | |
| 6555 | |
| 6556 | if (current->flags & PF_MEMALLOC) { |
| 6557 | redirty_page_for_writepage(wbc, page); |
| 6558 | unlock_page(page); |
| 6559 | return 0; |
| 6560 | } |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6561 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6562 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
| 6563 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6564 | |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 6565 | int btrfs_writepages(struct address_space *mapping, |
| 6566 | struct writeback_control *wbc) |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 6567 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6568 | struct extent_io_tree *tree; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 6569 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6570 | tree = &BTRFS_I(mapping->host)->io_tree; |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 6571 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
| 6572 | } |
| 6573 | |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 6574 | static int |
| 6575 | btrfs_readpages(struct file *file, struct address_space *mapping, |
| 6576 | struct list_head *pages, unsigned nr_pages) |
| 6577 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6578 | struct extent_io_tree *tree; |
| 6579 | tree = &BTRFS_I(mapping->host)->io_tree; |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 6580 | return extent_readpages(tree, mapping, pages, nr_pages, |
| 6581 | btrfs_get_extent); |
| 6582 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6583 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6584 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6585 | struct extent_io_tree *tree; |
| 6586 | struct extent_map_tree *map; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6587 | int ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6588 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6589 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
| 6590 | map = &BTRFS_I(page->mapping->host)->extent_tree; |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 6591 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6592 | if (ret == 1) { |
| 6593 | ClearPagePrivate(page); |
| 6594 | set_page_private(page, 0); |
| 6595 | page_cache_release(page); |
| 6596 | } |
| 6597 | return ret; |
| 6598 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6599 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6600 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
| 6601 | { |
Chris Mason | 98509cf | 2008-09-11 15:51:43 -0400 | [diff] [blame] | 6602 | if (PageWriteback(page) || PageDirty(page)) |
| 6603 | return 0; |
Yan Zheng | b335b00 | 2009-02-12 10:06:04 -0500 | [diff] [blame] | 6604 | return __btrfs_releasepage(page, gfp_flags & GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6605 | } |
| 6606 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6607 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
| 6608 | { |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 6609 | struct inode *inode = page->mapping->host; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6610 | struct extent_io_tree *tree; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6611 | struct btrfs_ordered_extent *ordered; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6612 | struct extent_state *cached_state = NULL; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6613 | u64 page_start = page_offset(page); |
| 6614 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6615 | |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 6616 | /* |
| 6617 | * we have the page locked, so new writeback can't start, |
| 6618 | * and the dirty bit won't be cleared while we are here. |
| 6619 | * |
| 6620 | * Wait for IO on this page so that we can safely clear |
| 6621 | * the PagePrivate2 bit and do ordered accounting |
| 6622 | */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6623 | wait_on_page_writeback(page); |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 6624 | |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 6625 | tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6626 | if (offset) { |
| 6627 | btrfs_releasepage(page, GFP_NOFS); |
| 6628 | return; |
| 6629 | } |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 6630 | lock_extent_bits(tree, page_start, page_end, 0, &cached_state); |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 6631 | ordered = btrfs_lookup_ordered_extent(inode, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6632 | page_offset(page)); |
| 6633 | if (ordered) { |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 6634 | /* |
| 6635 | * IO on this page will never be started, so we need |
| 6636 | * to account for any ordered extents now |
| 6637 | */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6638 | clear_extent_bit(tree, page_start, page_end, |
| 6639 | EXTENT_DIRTY | EXTENT_DELALLOC | |
Josef Bacik | 32c00af | 2009-10-08 13:34:05 -0400 | [diff] [blame] | 6640 | EXTENT_LOCKED | EXTENT_DO_ACCOUNTING, 1, 0, |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6641 | &cached_state, GFP_NOFS); |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 6642 | /* |
| 6643 | * whoever cleared the private bit is responsible |
| 6644 | * for the finish_ordered_io |
| 6645 | */ |
Josef Bacik | 5fd0204 | 2012-05-02 14:00:54 -0400 | [diff] [blame] | 6646 | if (TestClearPagePrivate2(page) && |
| 6647 | btrfs_dec_test_ordered_pending(inode, &ordered, page_start, |
| 6648 | PAGE_CACHE_SIZE, 1)) { |
| 6649 | btrfs_finish_ordered_io(ordered); |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 6650 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6651 | btrfs_put_ordered_extent(ordered); |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6652 | cached_state = NULL; |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 6653 | lock_extent_bits(tree, page_start, page_end, 0, &cached_state); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6654 | } |
| 6655 | clear_extent_bit(tree, page_start, page_end, |
Josef Bacik | 32c00af | 2009-10-08 13:34:05 -0400 | [diff] [blame] | 6656 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6657 | EXTENT_DO_ACCOUNTING, 1, 1, &cached_state, GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6658 | __btrfs_releasepage(page, GFP_NOFS); |
| 6659 | |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 6660 | ClearPageChecked(page); |
Chris Mason | 9ad6b7b | 2008-04-18 16:11:30 -0400 | [diff] [blame] | 6661 | if (PagePrivate(page)) { |
Chris Mason | 9ad6b7b | 2008-04-18 16:11:30 -0400 | [diff] [blame] | 6662 | ClearPagePrivate(page); |
| 6663 | set_page_private(page, 0); |
| 6664 | page_cache_release(page); |
| 6665 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6666 | } |
| 6667 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6668 | /* |
| 6669 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets |
| 6670 | * called from a page fault handler when a page is first dirtied. Hence we must |
| 6671 | * be careful to check for EOF conditions here. We set the page up correctly |
| 6672 | * for a written page which means we get ENOSPC checking when writing into |
| 6673 | * holes and correct delalloc and unwritten extent mapping on filesystems that |
| 6674 | * support these features. |
| 6675 | * |
| 6676 | * We are not allowed to take the i_mutex here so we have to play games to |
| 6677 | * protect against truncate races as the page could now be beyond EOF. Because |
| 6678 | * vmtruncate() writes the inode size before removing pages, once we have the |
| 6679 | * page lock we can determine safely if the page is beyond EOF. If it is not |
| 6680 | * beyond EOF, then the page is guaranteed safe against truncation until we |
| 6681 | * unlock the page. |
| 6682 | */ |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 6683 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6684 | { |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 6685 | struct page *page = vmf->page; |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 6686 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 6687 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6688 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 6689 | struct btrfs_ordered_extent *ordered; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6690 | struct extent_state *cached_state = NULL; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6691 | char *kaddr; |
| 6692 | unsigned long zero_start; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6693 | loff_t size; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 6694 | int ret; |
Chris Mason | 9998eb7 | 2012-01-25 13:47:40 -0500 | [diff] [blame] | 6695 | int reserved = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6696 | u64 page_start; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6697 | u64 page_end; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6698 | |
Jan Kara | b2b5ef5 | 2012-06-12 16:20:45 +0200 | [diff] [blame] | 6699 | sb_start_pagefault(inode->i_sb); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 6700 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
Chris Mason | 9998eb7 | 2012-01-25 13:47:40 -0500 | [diff] [blame] | 6701 | if (!ret) { |
Josef Bacik | e41f941 | 2012-03-26 09:46:47 -0400 | [diff] [blame] | 6702 | ret = file_update_time(vma->vm_file); |
Chris Mason | 9998eb7 | 2012-01-25 13:47:40 -0500 | [diff] [blame] | 6703 | reserved = 1; |
| 6704 | } |
Nick Piggin | 56a76f8 | 2009-03-31 15:23:23 -0700 | [diff] [blame] | 6705 | if (ret) { |
| 6706 | if (ret == -ENOMEM) |
| 6707 | ret = VM_FAULT_OOM; |
| 6708 | else /* -ENOSPC, -EIO, etc */ |
| 6709 | ret = VM_FAULT_SIGBUS; |
Chris Mason | 9998eb7 | 2012-01-25 13:47:40 -0500 | [diff] [blame] | 6710 | if (reserved) |
| 6711 | goto out; |
| 6712 | goto out_noreserve; |
Nick Piggin | 56a76f8 | 2009-03-31 15:23:23 -0700 | [diff] [blame] | 6713 | } |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 6714 | |
Nick Piggin | 56a76f8 | 2009-03-31 15:23:23 -0700 | [diff] [blame] | 6715 | ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6716 | again: |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6717 | lock_page(page); |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6718 | size = i_size_read(inode); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6719 | page_start = page_offset(page); |
| 6720 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6721 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6722 | if ((page->mapping != inode->i_mapping) || |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6723 | (page_start >= size)) { |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6724 | /* page got truncated out from underneath us */ |
| 6725 | goto out_unlock; |
| 6726 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6727 | wait_on_page_writeback(page); |
| 6728 | |
Jeff Mahoney | d008237 | 2012-03-01 14:57:19 +0100 | [diff] [blame] | 6729 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6730 | set_page_extent_mapped(page); |
| 6731 | |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 6732 | /* |
| 6733 | * we can't set the delalloc bits if there are pending ordered |
| 6734 | * extents. Drop our locks and wait for them to finish |
| 6735 | */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6736 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 6737 | if (ordered) { |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6738 | unlock_extent_cached(io_tree, page_start, page_end, |
| 6739 | &cached_state, GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6740 | unlock_page(page); |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 6741 | btrfs_start_ordered_extent(inode, ordered, 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6742 | btrfs_put_ordered_extent(ordered); |
| 6743 | goto again; |
| 6744 | } |
| 6745 | |
Josef Bacik | fbf1908 | 2009-10-01 17:10:23 -0400 | [diff] [blame] | 6746 | /* |
| 6747 | * XXX - page_mkwrite gets called every time the page is dirtied, even |
| 6748 | * if it was already dirty, so for space accounting reasons we need to |
| 6749 | * clear any delalloc bits for the range we are fixing to save. There |
| 6750 | * is probably a better way to do this, but for now keep consistent with |
| 6751 | * prepare_pages in the normal write path. |
| 6752 | */ |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6753 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
Josef Bacik | 32c00af | 2009-10-08 13:34:05 -0400 | [diff] [blame] | 6754 | EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING, |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6755 | 0, 0, &cached_state, GFP_NOFS); |
Josef Bacik | fbf1908 | 2009-10-01 17:10:23 -0400 | [diff] [blame] | 6756 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6757 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
| 6758 | &cached_state); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 6759 | if (ret) { |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6760 | unlock_extent_cached(io_tree, page_start, page_end, |
| 6761 | &cached_state, GFP_NOFS); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 6762 | ret = VM_FAULT_SIGBUS; |
| 6763 | goto out_unlock; |
| 6764 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6765 | ret = 0; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6766 | |
| 6767 | /* page is wholly or partially inside EOF */ |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6768 | if (page_start + PAGE_CACHE_SIZE > size) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6769 | zero_start = size & ~PAGE_CACHE_MASK; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6770 | else |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6771 | zero_start = PAGE_CACHE_SIZE; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6772 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6773 | if (zero_start != PAGE_CACHE_SIZE) { |
| 6774 | kaddr = kmap(page); |
| 6775 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
| 6776 | flush_dcache_page(page); |
| 6777 | kunmap(page); |
| 6778 | } |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 6779 | ClearPageChecked(page); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6780 | set_page_dirty(page); |
Chris Mason | 50a9b21 | 2009-09-11 12:33:12 -0400 | [diff] [blame] | 6781 | SetPageUptodate(page); |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 6782 | |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 6783 | BTRFS_I(inode)->last_trans = root->fs_info->generation; |
| 6784 | BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; |
Liu Bo | 46d8bc3 | 2012-08-29 01:07:55 -0600 | [diff] [blame] | 6785 | BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 6786 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6787 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS); |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6788 | |
| 6789 | out_unlock: |
Jan Kara | b2b5ef5 | 2012-06-12 16:20:45 +0200 | [diff] [blame] | 6790 | if (!ret) { |
| 6791 | sb_end_pagefault(inode->i_sb); |
Chris Mason | 50a9b21 | 2009-09-11 12:33:12 -0400 | [diff] [blame] | 6792 | return VM_FAULT_LOCKED; |
Jan Kara | b2b5ef5 | 2012-06-12 16:20:45 +0200 | [diff] [blame] | 6793 | } |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6794 | unlock_page(page); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 6795 | out: |
Josef Bacik | ec39e18 | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 6796 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
Chris Mason | 9998eb7 | 2012-01-25 13:47:40 -0500 | [diff] [blame] | 6797 | out_noreserve: |
Jan Kara | b2b5ef5 | 2012-06-12 16:20:45 +0200 | [diff] [blame] | 6798 | sb_end_pagefault(inode->i_sb); |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6799 | return ret; |
| 6800 | } |
| 6801 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 6802 | static int btrfs_truncate(struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6803 | { |
| 6804 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6805 | struct btrfs_block_rsv *rsv; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6806 | int ret; |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6807 | int err = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6808 | struct btrfs_trans_handle *trans; |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 6809 | unsigned long nr; |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 6810 | u64 mask = root->sectorsize - 1; |
Josef Bacik | 0712718 | 2011-08-19 10:29:59 -0400 | [diff] [blame] | 6811 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6812 | |
Josef Bacik | 2aaa665 | 2012-08-29 14:27:18 -0400 | [diff] [blame^] | 6813 | ret = btrfs_truncate_page(inode, inode->i_size, 0, 0); |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 6814 | if (ret) |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 6815 | return ret; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6816 | |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 6817 | btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6818 | btrfs_ordered_update_i_size(inode, inode->i_size, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6819 | |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6820 | /* |
| 6821 | * Yes ladies and gentelment, this is indeed ugly. The fact is we have |
| 6822 | * 3 things going on here |
| 6823 | * |
| 6824 | * 1) We need to reserve space for our orphan item and the space to |
| 6825 | * delete our orphan item. Lord knows we don't want to have a dangling |
| 6826 | * orphan item because we didn't reserve space to remove it. |
| 6827 | * |
| 6828 | * 2) We need to reserve space to update our inode. |
| 6829 | * |
| 6830 | * 3) We need to have something to cache all the space that is going to |
| 6831 | * be free'd up by the truncate operation, but also have some slack |
| 6832 | * space reserved in case it uses space during the truncate (thank you |
| 6833 | * very much snapshotting). |
| 6834 | * |
| 6835 | * And we need these to all be seperate. The fact is we can use alot of |
| 6836 | * space doing the truncate, and we have no earthly idea how much space |
| 6837 | * we will use, so we need the truncate reservation to be seperate so it |
| 6838 | * doesn't end up using space reserved for updating the inode or |
| 6839 | * removing the orphan item. We also need to be able to stop the |
| 6840 | * transaction and start a new one, which means we need to be able to |
| 6841 | * update the inode several times, and we have no idea of knowing how |
| 6842 | * many times that will be, so we can't just reserve 1 item for the |
| 6843 | * entirety of the opration, so that has to be done seperately as well. |
| 6844 | * Then there is the orphan item, which does indeed need to be held on |
| 6845 | * to for the whole operation, and we need nobody to touch this reserved |
| 6846 | * space except the orphan code. |
| 6847 | * |
| 6848 | * So that leaves us with |
| 6849 | * |
| 6850 | * 1) root->orphan_block_rsv - for the orphan deletion. |
| 6851 | * 2) rsv - for the truncate reservation, which we will steal from the |
| 6852 | * transaction reservation. |
| 6853 | * 3) fs_info->trans_block_rsv - this will have 1 items worth left for |
| 6854 | * updating the inode. |
| 6855 | */ |
| 6856 | rsv = btrfs_alloc_block_rsv(root); |
| 6857 | if (!rsv) |
| 6858 | return -ENOMEM; |
Josef Bacik | 4a33854 | 2011-08-29 11:01:31 -0400 | [diff] [blame] | 6859 | rsv->size = min_size; |
Josef Bacik | ca7e70f | 2012-08-27 17:48:15 -0400 | [diff] [blame] | 6860 | rsv->failfast = 1; |
Josef Bacik | f0cd846 | 2011-03-04 14:37:08 -0500 | [diff] [blame] | 6861 | |
Josef Bacik | 907cbce | 2011-08-08 13:46:15 -0400 | [diff] [blame] | 6862 | /* |
Josef Bacik | 0712718 | 2011-08-19 10:29:59 -0400 | [diff] [blame] | 6863 | * 1 for the truncate slack space |
Josef Bacik | 907cbce | 2011-08-08 13:46:15 -0400 | [diff] [blame] | 6864 | * 1 for the orphan item we're going to add |
| 6865 | * 1 for the orphan item deletion |
| 6866 | * 1 for updating the inode. |
| 6867 | */ |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6868 | trans = btrfs_start_transaction(root, 4); |
| 6869 | if (IS_ERR(trans)) { |
| 6870 | err = PTR_ERR(trans); |
| 6871 | goto out; |
| 6872 | } |
Josef Bacik | f0cd846 | 2011-03-04 14:37:08 -0500 | [diff] [blame] | 6873 | |
Josef Bacik | 907cbce | 2011-08-08 13:46:15 -0400 | [diff] [blame] | 6874 | /* Migrate the slack space for the truncate to our reserve */ |
| 6875 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv, |
| 6876 | min_size); |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6877 | BUG_ON(ret); |
Josef Bacik | f0cd846 | 2011-03-04 14:37:08 -0500 | [diff] [blame] | 6878 | |
| 6879 | ret = btrfs_orphan_add(trans, inode); |
| 6880 | if (ret) { |
| 6881 | btrfs_end_transaction(trans, root); |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6882 | goto out; |
Josef Bacik | f0cd846 | 2011-03-04 14:37:08 -0500 | [diff] [blame] | 6883 | } |
| 6884 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 6885 | /* |
| 6886 | * setattr is responsible for setting the ordered_data_close flag, |
| 6887 | * but that is only tested during the last file release. That |
| 6888 | * could happen well after the next commit, leaving a great big |
| 6889 | * window where new writes may get lost if someone chooses to write |
| 6890 | * to this file after truncating to zero |
| 6891 | * |
| 6892 | * The inode doesn't have any dirty data here, and so if we commit |
| 6893 | * this is a noop. If someone immediately starts writing to the inode |
| 6894 | * it is very likely we'll catch some of their writes in this |
| 6895 | * transaction, and the commit will find this file on the ordered |
| 6896 | * data list with good things to send down. |
| 6897 | * |
| 6898 | * This is a best effort solution, there is still a window where |
| 6899 | * using truncate to replace the contents of the file will |
| 6900 | * end up with a zero length file after a crash. |
| 6901 | */ |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 6902 | if (inode->i_size == 0 && test_bit(BTRFS_INODE_ORDERED_DATA_CLOSE, |
| 6903 | &BTRFS_I(inode)->runtime_flags)) |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 6904 | btrfs_add_ordered_operation(trans, root, inode); |
| 6905 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 6906 | /* |
| 6907 | * So if we truncate and then write and fsync we normally would just |
| 6908 | * write the extents that changed, which is a problem if we need to |
| 6909 | * first truncate that entire inode. So set this flag so we write out |
| 6910 | * all of the extents in the inode to the sync log so we're completely |
| 6911 | * safe. |
| 6912 | */ |
| 6913 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); |
Josef Bacik | ca7e70f | 2012-08-27 17:48:15 -0400 | [diff] [blame] | 6914 | trans->block_rsv = rsv; |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 6915 | |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6916 | while (1) { |
| 6917 | ret = btrfs_truncate_inode_items(trans, root, inode, |
| 6918 | inode->i_size, |
| 6919 | BTRFS_EXTENT_DATA_KEY); |
Josef Bacik | ca7e70f | 2012-08-27 17:48:15 -0400 | [diff] [blame] | 6920 | if (ret != -ENOSPC) { |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6921 | err = ret; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6922 | break; |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6923 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6924 | |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6925 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6926 | ret = btrfs_update_inode(trans, root, inode); |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6927 | if (ret) { |
| 6928 | err = ret; |
| 6929 | break; |
| 6930 | } |
Josef Bacik | ca7e70f | 2012-08-27 17:48:15 -0400 | [diff] [blame] | 6931 | |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6932 | nr = trans->blocks_used; |
| 6933 | btrfs_end_transaction(trans, root); |
| 6934 | btrfs_btree_balance_dirty(root, nr); |
Josef Bacik | ca7e70f | 2012-08-27 17:48:15 -0400 | [diff] [blame] | 6935 | |
| 6936 | trans = btrfs_start_transaction(root, 2); |
| 6937 | if (IS_ERR(trans)) { |
| 6938 | ret = err = PTR_ERR(trans); |
| 6939 | trans = NULL; |
| 6940 | break; |
| 6941 | } |
| 6942 | |
| 6943 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, |
| 6944 | rsv, min_size); |
| 6945 | BUG_ON(ret); /* shouldn't happen */ |
| 6946 | trans->block_rsv = rsv; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6947 | } |
| 6948 | |
| 6949 | if (ret == 0 && inode->i_nlink > 0) { |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6950 | trans->block_rsv = root->orphan_block_rsv; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6951 | ret = btrfs_orphan_del(trans, inode); |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6952 | if (ret) |
| 6953 | err = ret; |
Josef Bacik | ded5db9 | 2011-03-04 14:09:46 -0500 | [diff] [blame] | 6954 | } else if (ret && inode->i_nlink > 0) { |
| 6955 | /* |
| 6956 | * Failed to do the truncate, remove us from the in memory |
| 6957 | * orphan list. |
| 6958 | */ |
| 6959 | ret = btrfs_orphan_del(NULL, inode); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6960 | } |
| 6961 | |
Chris Mason | 917c16b | 2011-11-08 14:49:59 -0500 | [diff] [blame] | 6962 | if (trans) { |
| 6963 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
| 6964 | ret = btrfs_update_inode(trans, root, inode); |
| 6965 | if (ret && !err) |
| 6966 | err = ret; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 6967 | |
Chris Mason | 917c16b | 2011-11-08 14:49:59 -0500 | [diff] [blame] | 6968 | nr = trans->blocks_used; |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 6969 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | 917c16b | 2011-11-08 14:49:59 -0500 | [diff] [blame] | 6970 | btrfs_btree_balance_dirty(root, nr); |
| 6971 | } |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6972 | |
| 6973 | out: |
| 6974 | btrfs_free_block_rsv(root, rsv); |
| 6975 | |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6976 | if (ret && !err) |
| 6977 | err = ret; |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 6978 | |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6979 | return err; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6980 | } |
| 6981 | |
Sven Wegener | 3b96362 | 2008-06-09 21:57:42 -0400 | [diff] [blame] | 6982 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 6983 | * create a new subvolume directory/inode (helper for the ioctl). |
| 6984 | */ |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 6985 | int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 6986 | struct btrfs_root *new_root, u64 new_dirid) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6987 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6988 | struct inode *inode; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 6989 | int err; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 6990 | u64 index = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6991 | |
Florian Albrechtskirchinger | 12fc9d0 | 2012-02-10 22:15:54 +0100 | [diff] [blame] | 6992 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, |
| 6993 | new_dirid, new_dirid, |
| 6994 | S_IFDIR | (~current_umask() & S_IRWXUGO), |
| 6995 | &index); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 6996 | if (IS_ERR(inode)) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 6997 | return PTR_ERR(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6998 | inode->i_op = &btrfs_dir_inode_operations; |
| 6999 | inode->i_fop = &btrfs_dir_file_operations; |
| 7000 | |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 7001 | set_nlink(inode, 1); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 7002 | btrfs_i_size_write(inode, 0); |
Sven Wegener | 3b96362 | 2008-06-09 21:57:42 -0400 | [diff] [blame] | 7003 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7004 | err = btrfs_update_inode(trans, new_root, inode); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 7005 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7006 | iput(inode); |
Mark Fasheh | ce59897 | 2011-07-26 11:32:23 -0700 | [diff] [blame] | 7007 | return err; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7008 | } |
| 7009 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7010 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
| 7011 | { |
| 7012 | struct btrfs_inode *ei; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7013 | struct inode *inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7014 | |
| 7015 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); |
| 7016 | if (!ei) |
| 7017 | return NULL; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7018 | |
| 7019 | ei->root = NULL; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7020 | ei->generation = 0; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 7021 | ei->last_trans = 0; |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 7022 | ei->last_sub_trans = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7023 | ei->logged_trans = 0; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7024 | ei->delalloc_bytes = 0; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7025 | ei->disk_i_size = 0; |
| 7026 | ei->flags = 0; |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 7027 | ei->csum_bytes = 0; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7028 | ei->index_cnt = (u64)-1; |
| 7029 | ei->last_unlink_trans = 0; |
Liu Bo | 46d8bc3 | 2012-08-29 01:07:55 -0600 | [diff] [blame] | 7030 | ei->last_log_commit = 0; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7031 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 7032 | spin_lock_init(&ei->lock); |
| 7033 | ei->outstanding_extents = 0; |
| 7034 | ei->reserved_extents = 0; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7035 | |
Josef Bacik | 72ac3c0 | 2012-05-23 14:13:11 -0400 | [diff] [blame] | 7036 | ei->runtime_flags = 0; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 7037 | ei->force_compress = BTRFS_COMPRESS_NONE; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7038 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 7039 | ei->delayed_node = NULL; |
| 7040 | |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7041 | inode = &ei->vfs_inode; |
David Sterba | a8067e0 | 2011-04-21 00:34:43 +0200 | [diff] [blame] | 7042 | extent_map_tree_init(&ei->extent_tree); |
David Sterba | f993c88 | 2011-04-20 23:35:57 +0200 | [diff] [blame] | 7043 | extent_io_tree_init(&ei->io_tree, &inode->i_data); |
| 7044 | extent_io_tree_init(&ei->io_failure_tree, &inode->i_data); |
Josef Bacik | 0b32f4b | 2012-03-13 09:38:00 -0400 | [diff] [blame] | 7045 | ei->io_tree.track_uptodate = 1; |
| 7046 | ei->io_failure_tree.track_uptodate = 1; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7047 | mutex_init(&ei->log_mutex); |
Josef Bacik | f248679 | 2012-01-13 12:09:22 -0500 | [diff] [blame] | 7048 | mutex_init(&ei->delalloc_mutex); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7049 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7050 | INIT_LIST_HEAD(&ei->delalloc_inodes); |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7051 | INIT_LIST_HEAD(&ei->ordered_operations); |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 7052 | RB_CLEAR_NODE(&ei->rb_node); |
| 7053 | |
| 7054 | return inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7055 | } |
| 7056 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 7057 | static void btrfs_i_callback(struct rcu_head *head) |
| 7058 | { |
| 7059 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 7060 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
| 7061 | } |
| 7062 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7063 | void btrfs_destroy_inode(struct inode *inode) |
| 7064 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7065 | struct btrfs_ordered_extent *ordered; |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7066 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 7067 | |
Al Viro | b3d9b7a | 2012-06-09 13:51:19 -0400 | [diff] [blame] | 7068 | WARN_ON(!hlist_empty(&inode->i_dentry)); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7069 | WARN_ON(inode->i_data.nrpages); |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 7070 | WARN_ON(BTRFS_I(inode)->outstanding_extents); |
| 7071 | WARN_ON(BTRFS_I(inode)->reserved_extents); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 7072 | WARN_ON(BTRFS_I(inode)->delalloc_bytes); |
| 7073 | WARN_ON(BTRFS_I(inode)->csum_bytes); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7074 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7075 | /* |
Josef Bacik | a6dbd42 | 2009-11-11 15:53:34 -0500 | [diff] [blame] | 7076 | * This can happen where we create an inode, but somebody else also |
| 7077 | * created the same inode and we need to destroy the one we already |
| 7078 | * created. |
| 7079 | */ |
| 7080 | if (!root) |
| 7081 | goto free; |
| 7082 | |
| 7083 | /* |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7084 | * Make sure we're properly removed from the ordered operation |
| 7085 | * lists. |
| 7086 | */ |
| 7087 | smp_mb(); |
| 7088 | if (!list_empty(&BTRFS_I(inode)->ordered_operations)) { |
| 7089 | spin_lock(&root->fs_info->ordered_extent_lock); |
| 7090 | list_del_init(&BTRFS_I(inode)->ordered_operations); |
| 7091 | spin_unlock(&root->fs_info->ordered_extent_lock); |
| 7092 | } |
| 7093 | |
Josef Bacik | 8a35d95 | 2012-05-23 14:26:42 -0400 | [diff] [blame] | 7094 | if (test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
| 7095 | &BTRFS_I(inode)->runtime_flags)) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7096 | printk(KERN_INFO "BTRFS: inode %llu still on the orphan list\n", |
| 7097 | (unsigned long long)btrfs_ino(inode)); |
Josef Bacik | 8a35d95 | 2012-05-23 14:26:42 -0400 | [diff] [blame] | 7098 | atomic_dec(&root->orphan_inodes); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 7099 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 7100 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 7101 | while (1) { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7102 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); |
| 7103 | if (!ordered) |
| 7104 | break; |
| 7105 | else { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 7106 | printk(KERN_ERR "btrfs found ordered " |
| 7107 | "extent %llu %llu on inode cleanup\n", |
| 7108 | (unsigned long long)ordered->file_offset, |
| 7109 | (unsigned long long)ordered->len); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7110 | btrfs_remove_ordered_extent(inode, ordered); |
| 7111 | btrfs_put_ordered_extent(ordered); |
| 7112 | btrfs_put_ordered_extent(ordered); |
| 7113 | } |
| 7114 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 7115 | inode_tree_del(inode); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 7116 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); |
Josef Bacik | a6dbd42 | 2009-11-11 15:53:34 -0500 | [diff] [blame] | 7117 | free: |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 7118 | btrfs_remove_delayed_node(inode); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 7119 | call_rcu(&inode->i_rcu, btrfs_i_callback); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7120 | } |
| 7121 | |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 7122 | int btrfs_drop_inode(struct inode *inode) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7123 | { |
| 7124 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 7125 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7126 | if (btrfs_root_refs(&root->root_item) == 0 && |
Liu Bo | 83eea1f | 2012-07-10 05:28:39 -0600 | [diff] [blame] | 7127 | !btrfs_is_free_space_inode(inode)) |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 7128 | return 1; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7129 | else |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 7130 | return generic_drop_inode(inode); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7131 | } |
| 7132 | |
Sven Wegener | 0ee0fda | 2008-07-30 16:54:26 -0400 | [diff] [blame] | 7133 | static void init_once(void *foo) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7134 | { |
| 7135 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; |
| 7136 | |
| 7137 | inode_init_once(&ei->vfs_inode); |
| 7138 | } |
| 7139 | |
| 7140 | void btrfs_destroy_cachep(void) |
| 7141 | { |
| 7142 | if (btrfs_inode_cachep) |
| 7143 | kmem_cache_destroy(btrfs_inode_cachep); |
| 7144 | if (btrfs_trans_handle_cachep) |
| 7145 | kmem_cache_destroy(btrfs_trans_handle_cachep); |
| 7146 | if (btrfs_transaction_cachep) |
| 7147 | kmem_cache_destroy(btrfs_transaction_cachep); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7148 | if (btrfs_path_cachep) |
| 7149 | kmem_cache_destroy(btrfs_path_cachep); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 7150 | if (btrfs_free_space_cachep) |
| 7151 | kmem_cache_destroy(btrfs_free_space_cachep); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7152 | } |
| 7153 | |
| 7154 | int btrfs_init_cachep(void) |
| 7155 | { |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 7156 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", |
| 7157 | sizeof(struct btrfs_inode), 0, |
| 7158 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, init_once); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7159 | if (!btrfs_inode_cachep) |
| 7160 | goto fail; |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 7161 | |
| 7162 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", |
| 7163 | sizeof(struct btrfs_trans_handle), 0, |
| 7164 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7165 | if (!btrfs_trans_handle_cachep) |
| 7166 | goto fail; |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 7167 | |
| 7168 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", |
| 7169 | sizeof(struct btrfs_transaction), 0, |
| 7170 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7171 | if (!btrfs_transaction_cachep) |
| 7172 | goto fail; |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 7173 | |
| 7174 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", |
| 7175 | sizeof(struct btrfs_path), 0, |
| 7176 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7177 | if (!btrfs_path_cachep) |
| 7178 | goto fail; |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 7179 | |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 7180 | btrfs_free_space_cachep = kmem_cache_create("btrfs_free_space_cache", |
| 7181 | sizeof(struct btrfs_free_space), 0, |
| 7182 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
| 7183 | if (!btrfs_free_space_cachep) |
| 7184 | goto fail; |
| 7185 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7186 | return 0; |
| 7187 | fail: |
| 7188 | btrfs_destroy_cachep(); |
| 7189 | return -ENOMEM; |
| 7190 | } |
| 7191 | |
| 7192 | static int btrfs_getattr(struct vfsmount *mnt, |
| 7193 | struct dentry *dentry, struct kstat *stat) |
| 7194 | { |
| 7195 | struct inode *inode = dentry->d_inode; |
David Sterba | fadc0d8 | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 7196 | u32 blocksize = inode->i_sb->s_blocksize; |
| 7197 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7198 | generic_fillattr(inode, stat); |
Al Viro | 0ee5dc6 | 2011-07-07 15:44:25 -0400 | [diff] [blame] | 7199 | stat->dev = BTRFS_I(inode)->root->anon_dev; |
Chris Mason | d666746 | 2008-01-03 14:51:00 -0500 | [diff] [blame] | 7200 | stat->blksize = PAGE_CACHE_SIZE; |
David Sterba | fadc0d8 | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 7201 | stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) + |
| 7202 | ALIGN(BTRFS_I(inode)->delalloc_bytes, blocksize)) >> 9; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7203 | return 0; |
| 7204 | } |
| 7205 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 7206 | /* |
| 7207 | * If a file is moved, it will inherit the cow and compression flags of the new |
| 7208 | * directory. |
| 7209 | */ |
| 7210 | static void fixup_inode_flags(struct inode *dir, struct inode *inode) |
| 7211 | { |
| 7212 | struct btrfs_inode *b_dir = BTRFS_I(dir); |
| 7213 | struct btrfs_inode *b_inode = BTRFS_I(inode); |
| 7214 | |
| 7215 | if (b_dir->flags & BTRFS_INODE_NODATACOW) |
| 7216 | b_inode->flags |= BTRFS_INODE_NODATACOW; |
| 7217 | else |
| 7218 | b_inode->flags &= ~BTRFS_INODE_NODATACOW; |
| 7219 | |
Liu Bo | bc17823 | 2012-06-14 02:23:18 -0600 | [diff] [blame] | 7220 | if (b_dir->flags & BTRFS_INODE_COMPRESS) { |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 7221 | b_inode->flags |= BTRFS_INODE_COMPRESS; |
Liu Bo | bc17823 | 2012-06-14 02:23:18 -0600 | [diff] [blame] | 7222 | b_inode->flags &= ~BTRFS_INODE_NOCOMPRESS; |
| 7223 | } else { |
| 7224 | b_inode->flags &= ~(BTRFS_INODE_COMPRESS | |
| 7225 | BTRFS_INODE_NOCOMPRESS); |
| 7226 | } |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 7227 | } |
| 7228 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 7229 | static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 7230 | struct inode *new_dir, struct dentry *new_dentry) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7231 | { |
| 7232 | struct btrfs_trans_handle *trans; |
| 7233 | struct btrfs_root *root = BTRFS_I(old_dir)->root; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7234 | struct btrfs_root *dest = BTRFS_I(new_dir)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7235 | struct inode *new_inode = new_dentry->d_inode; |
| 7236 | struct inode *old_inode = old_dentry->d_inode; |
| 7237 | struct timespec ctime = CURRENT_TIME; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 7238 | u64 index = 0; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7239 | u64 root_objectid; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7240 | int ret; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7241 | u64 old_ino = btrfs_ino(old_inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7242 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7243 | if (btrfs_ino(new_dir) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
Yan, Zheng | f679a84 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 7244 | return -EPERM; |
| 7245 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7246 | /* we only allow rename subvolume link between subvolumes */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7247 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest) |
Chris Mason | 3394e16 | 2008-11-17 20:42:26 -0500 | [diff] [blame] | 7248 | return -EXDEV; |
| 7249 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7250 | if (old_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID || |
| 7251 | (new_inode && btrfs_ino(new_inode) == BTRFS_FIRST_FREE_OBJECTID)) |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7252 | return -ENOTEMPTY; |
| 7253 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7254 | if (S_ISDIR(old_inode->i_mode) && new_inode && |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7255 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7256 | return -ENOTEMPTY; |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7257 | /* |
| 7258 | * we're using rename to replace one file with another. |
| 7259 | * and the replacement file is large. Start IO on it now so |
| 7260 | * we don't add too much work to the end of the transaction |
| 7261 | */ |
Bartlomiej Zolnierkiewicz | 4baf8c9 | 2009-08-07 13:47:08 -0400 | [diff] [blame] | 7262 | if (new_inode && S_ISREG(old_inode->i_mode) && new_inode->i_size && |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7263 | old_inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT) |
| 7264 | filemap_flush(old_inode->i_mapping); |
| 7265 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7266 | /* close the racy window with snapshot create/destroy ioctl */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7267 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7268 | down_read(&root->fs_info->subvol_sem); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 7269 | /* |
| 7270 | * We want to reserve the absolute worst case amount of items. So if |
| 7271 | * both inodes are subvols and we need to unlink them then that would |
| 7272 | * require 4 item modifications, but if they are both normal inodes it |
| 7273 | * would require 5 item modifications, so we'll assume their normal |
| 7274 | * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items |
| 7275 | * should cover the worst case number of items we'll modify. |
| 7276 | */ |
| 7277 | trans = btrfs_start_transaction(root, 20); |
Johann Lombardi | b44c59a | 2011-03-31 13:23:47 +0000 | [diff] [blame] | 7278 | if (IS_ERR(trans)) { |
| 7279 | ret = PTR_ERR(trans); |
| 7280 | goto out_notrans; |
| 7281 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7282 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7283 | if (dest != root) |
| 7284 | btrfs_record_root_in_trans(trans, dest); |
| 7285 | |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 7286 | ret = btrfs_set_inode_index(new_dir, &index); |
| 7287 | if (ret) |
| 7288 | goto out_fail; |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7289 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7290 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7291 | /* force full log commit if subvolume involved. */ |
| 7292 | root->fs_info->last_trans_log_full_commit = trans->transid; |
| 7293 | } else { |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 7294 | ret = btrfs_insert_inode_ref(trans, dest, |
| 7295 | new_dentry->d_name.name, |
| 7296 | new_dentry->d_name.len, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7297 | old_ino, |
| 7298 | btrfs_ino(new_dir), index); |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 7299 | if (ret) |
| 7300 | goto out_fail; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7301 | /* |
| 7302 | * this is an ugly little race, but the rename is required |
| 7303 | * to make sure that if we crash, the inode is either at the |
| 7304 | * old name or the new one. pinning the log transaction lets |
| 7305 | * us make sure we don't allow a log commit to come in after |
| 7306 | * we unlink the name but before we add the new name back in. |
| 7307 | */ |
| 7308 | btrfs_pin_log_trans(root); |
| 7309 | } |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 7310 | /* |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7311 | * make sure the inode gets flushed if it is replacing |
| 7312 | * something. |
| 7313 | */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7314 | if (new_inode && new_inode->i_size && S_ISREG(old_inode->i_mode)) |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7315 | btrfs_add_ordered_operation(trans, root, old_inode); |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7316 | |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 7317 | inode_inc_iversion(old_dir); |
| 7318 | inode_inc_iversion(new_dir); |
| 7319 | inode_inc_iversion(old_inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7320 | old_dir->i_ctime = old_dir->i_mtime = ctime; |
| 7321 | new_dir->i_ctime = new_dir->i_mtime = ctime; |
| 7322 | old_inode->i_ctime = ctime; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7323 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 7324 | if (old_dentry->d_parent != new_dentry->d_parent) |
| 7325 | btrfs_record_unlink_dir(trans, old_dir, old_inode, 1); |
| 7326 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7327 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7328 | root_objectid = BTRFS_I(old_inode)->root->root_key.objectid; |
| 7329 | ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid, |
| 7330 | old_dentry->d_name.name, |
| 7331 | old_dentry->d_name.len); |
| 7332 | } else { |
Al Viro | 9298679 | 2011-03-04 17:14:37 +0000 | [diff] [blame] | 7333 | ret = __btrfs_unlink_inode(trans, root, old_dir, |
| 7334 | old_dentry->d_inode, |
| 7335 | old_dentry->d_name.name, |
| 7336 | old_dentry->d_name.len); |
| 7337 | if (!ret) |
| 7338 | ret = btrfs_update_inode(trans, root, old_inode); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7339 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7340 | if (ret) { |
| 7341 | btrfs_abort_transaction(trans, root, ret); |
| 7342 | goto out_fail; |
| 7343 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7344 | |
| 7345 | if (new_inode) { |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 7346 | inode_inc_iversion(new_inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7347 | new_inode->i_ctime = CURRENT_TIME; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7348 | if (unlikely(btrfs_ino(new_inode) == |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7349 | BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
| 7350 | root_objectid = BTRFS_I(new_inode)->location.objectid; |
| 7351 | ret = btrfs_unlink_subvol(trans, dest, new_dir, |
| 7352 | root_objectid, |
| 7353 | new_dentry->d_name.name, |
| 7354 | new_dentry->d_name.len); |
| 7355 | BUG_ON(new_inode->i_nlink == 0); |
| 7356 | } else { |
| 7357 | ret = btrfs_unlink_inode(trans, dest, new_dir, |
| 7358 | new_dentry->d_inode, |
| 7359 | new_dentry->d_name.name, |
| 7360 | new_dentry->d_name.len); |
| 7361 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7362 | if (!ret && new_inode->i_nlink == 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7363 | ret = btrfs_orphan_add(trans, new_dentry->d_inode); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7364 | BUG_ON(ret); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 7365 | } |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7366 | if (ret) { |
| 7367 | btrfs_abort_transaction(trans, root, ret); |
| 7368 | goto out_fail; |
| 7369 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7370 | } |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 7371 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 7372 | fixup_inode_flags(new_dir, old_inode); |
| 7373 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7374 | ret = btrfs_add_link(trans, new_dir, old_inode, |
| 7375 | new_dentry->d_name.name, |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 7376 | new_dentry->d_name.len, 0, index); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7377 | if (ret) { |
| 7378 | btrfs_abort_transaction(trans, root, ret); |
| 7379 | goto out_fail; |
| 7380 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7381 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7382 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID) { |
Al Viro | 10d9f30 | 2011-07-16 23:09:10 -0400 | [diff] [blame] | 7383 | struct dentry *parent = new_dentry->d_parent; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 7384 | btrfs_log_new_name(trans, old_inode, old_dir, parent); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7385 | btrfs_end_log_trans(root); |
| 7386 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7387 | out_fail: |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 7388 | btrfs_end_transaction(trans, root); |
Johann Lombardi | b44c59a | 2011-03-31 13:23:47 +0000 | [diff] [blame] | 7389 | out_notrans: |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7390 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7391 | up_read(&root->fs_info->subvol_sem); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 7392 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7393 | return ret; |
| 7394 | } |
| 7395 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 7396 | /* |
| 7397 | * some fairly slow code that needs optimization. This walks the list |
| 7398 | * of all the inodes with pending delalloc and forces them to disk. |
| 7399 | */ |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 7400 | int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput) |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 7401 | { |
| 7402 | struct list_head *head = &root->fs_info->delalloc_inodes; |
| 7403 | struct btrfs_inode *binode; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 7404 | struct inode *inode; |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 7405 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 7406 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
| 7407 | return -EROFS; |
| 7408 | |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 7409 | spin_lock(&root->fs_info->delalloc_lock); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 7410 | while (!list_empty(head)) { |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 7411 | binode = list_entry(head->next, struct btrfs_inode, |
| 7412 | delalloc_inodes); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 7413 | inode = igrab(&binode->vfs_inode); |
| 7414 | if (!inode) |
| 7415 | list_del_init(&binode->delalloc_inodes); |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 7416 | spin_unlock(&root->fs_info->delalloc_lock); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 7417 | if (inode) { |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 7418 | filemap_flush(inode->i_mapping); |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 7419 | if (delay_iput) |
| 7420 | btrfs_add_delayed_iput(inode); |
| 7421 | else |
| 7422 | iput(inode); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 7423 | } |
| 7424 | cond_resched(); |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 7425 | spin_lock(&root->fs_info->delalloc_lock); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 7426 | } |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 7427 | spin_unlock(&root->fs_info->delalloc_lock); |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 7428 | |
| 7429 | /* the filemap_flush will queue IO into the worker threads, but |
| 7430 | * we have to make sure the IO is actually started and that |
| 7431 | * ordered extents get created before we return |
| 7432 | */ |
| 7433 | atomic_inc(&root->fs_info->async_submit_draining); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 7434 | while (atomic_read(&root->fs_info->nr_async_submits) || |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 7435 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 7436 | wait_event(root->fs_info->async_submit_wait, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 7437 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
| 7438 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 7439 | } |
| 7440 | atomic_dec(&root->fs_info->async_submit_draining); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 7441 | return 0; |
| 7442 | } |
| 7443 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7444 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
| 7445 | const char *symname) |
| 7446 | { |
| 7447 | struct btrfs_trans_handle *trans; |
| 7448 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 7449 | struct btrfs_path *path; |
| 7450 | struct btrfs_key key; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 7451 | struct inode *inode = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7452 | int err; |
| 7453 | int drop_inode = 0; |
| 7454 | u64 objectid; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 7455 | u64 index = 0 ; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7456 | int name_len; |
| 7457 | int datasize; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7458 | unsigned long ptr; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7459 | struct btrfs_file_extent_item *ei; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7460 | struct extent_buffer *leaf; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 7461 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7462 | |
| 7463 | name_len = strlen(symname) + 1; |
| 7464 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) |
| 7465 | return -ENAMETOOLONG; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 7466 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 7467 | /* |
| 7468 | * 2 items for inode item and ref |
| 7469 | * 2 items for dir items |
| 7470 | * 1 item for xattr if selinux is on |
| 7471 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 7472 | trans = btrfs_start_transaction(root, 5); |
| 7473 | if (IS_ERR(trans)) |
| 7474 | return PTR_ERR(trans); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 7475 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 7476 | err = btrfs_find_free_ino(root, &objectid); |
| 7477 | if (err) |
| 7478 | goto out_unlock; |
| 7479 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 7480 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7481 | dentry->d_name.len, btrfs_ino(dir), objectid, |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 7482 | S_IFLNK|S_IRWXUGO, &index); |
Tsutomu Itoh | 7cf96da | 2011-04-25 19:43:53 -0400 | [diff] [blame] | 7483 | if (IS_ERR(inode)) { |
| 7484 | err = PTR_ERR(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7485 | goto out_unlock; |
Tsutomu Itoh | 7cf96da | 2011-04-25 19:43:53 -0400 | [diff] [blame] | 7486 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7487 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 7488 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 7489 | if (err) { |
| 7490 | drop_inode = 1; |
| 7491 | goto out_unlock; |
| 7492 | } |
| 7493 | |
Casey Schaufler | ad19db7 | 2011-12-15 10:09:07 -0500 | [diff] [blame] | 7494 | /* |
| 7495 | * If the active LSM wants to access the inode during |
| 7496 | * d_instantiate it needs these. Smack checks to see |
| 7497 | * if the filesystem supports xattrs by looking at the |
| 7498 | * ops vector. |
| 7499 | */ |
| 7500 | inode->i_fop = &btrfs_file_operations; |
| 7501 | inode->i_op = &btrfs_file_inode_operations; |
| 7502 | |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 7503 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7504 | if (err) |
| 7505 | drop_inode = 1; |
| 7506 | else { |
| 7507 | inode->i_mapping->a_ops = &btrfs_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 7508 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 7509 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7510 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7511 | if (drop_inode) |
| 7512 | goto out_unlock; |
| 7513 | |
| 7514 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 7515 | if (!path) { |
| 7516 | err = -ENOMEM; |
| 7517 | drop_inode = 1; |
| 7518 | goto out_unlock; |
| 7519 | } |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7520 | key.objectid = btrfs_ino(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7521 | key.offset = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7522 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
| 7523 | datasize = btrfs_file_extent_calc_inline_size(name_len); |
| 7524 | err = btrfs_insert_empty_item(trans, root, path, &key, |
| 7525 | datasize); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 7526 | if (err) { |
| 7527 | drop_inode = 1; |
Julia Lawall | b083916 | 2011-05-14 07:10:51 +0000 | [diff] [blame] | 7528 | btrfs_free_path(path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 7529 | goto out_unlock; |
| 7530 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7531 | leaf = path->nodes[0]; |
| 7532 | ei = btrfs_item_ptr(leaf, path->slots[0], |
| 7533 | struct btrfs_file_extent_item); |
| 7534 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); |
| 7535 | btrfs_set_file_extent_type(leaf, ei, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7536 | BTRFS_FILE_EXTENT_INLINE); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 7537 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
| 7538 | btrfs_set_file_extent_compression(leaf, ei, 0); |
| 7539 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); |
| 7540 | btrfs_set_file_extent_ram_bytes(leaf, ei, name_len); |
| 7541 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7542 | ptr = btrfs_file_extent_inline_start(ei); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7543 | write_extent_buffer(leaf, symname, ptr, name_len); |
| 7544 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7545 | btrfs_free_path(path); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7546 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7547 | inode->i_op = &btrfs_symlink_inode_operations; |
| 7548 | inode->i_mapping->a_ops = &btrfs_symlink_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 7549 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7550 | inode_set_bytes(inode, name_len); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 7551 | btrfs_i_size_write(inode, name_len - 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 7552 | err = btrfs_update_inode(trans, root, inode); |
| 7553 | if (err) |
| 7554 | drop_inode = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7555 | |
| 7556 | out_unlock: |
Al Viro | 08c422c | 2011-12-23 07:58:13 -0500 | [diff] [blame] | 7557 | if (!err) |
| 7558 | d_instantiate(dentry, inode); |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 7559 | nr = trans->blocks_used; |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 7560 | btrfs_end_transaction(trans, root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7561 | if (drop_inode) { |
| 7562 | inode_dec_link_count(inode); |
| 7563 | iput(inode); |
| 7564 | } |
Chris Mason | d3c2fdcf | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 7565 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7566 | return err; |
| 7567 | } |
Chris Mason | 1643298 | 2008-04-10 10:23:21 -0400 | [diff] [blame] | 7568 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7569 | static int __btrfs_prealloc_file_range(struct inode *inode, int mode, |
| 7570 | u64 start, u64 num_bytes, u64 min_size, |
| 7571 | loff_t actual_len, u64 *alloc_hint, |
| 7572 | struct btrfs_trans_handle *trans) |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7573 | { |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 7574 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 7575 | struct extent_map *em; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7576 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 7577 | struct btrfs_key ins; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7578 | u64 cur_offset = start; |
Josef Bacik | 55a61d1 | 2010-11-22 18:50:32 +0000 | [diff] [blame] | 7579 | u64 i_size; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7580 | int ret = 0; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7581 | bool own_trans = true; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7582 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7583 | if (trans) |
| 7584 | own_trans = false; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7585 | while (num_bytes > 0) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7586 | if (own_trans) { |
| 7587 | trans = btrfs_start_transaction(root, 3); |
| 7588 | if (IS_ERR(trans)) { |
| 7589 | ret = PTR_ERR(trans); |
| 7590 | break; |
| 7591 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7592 | } |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7593 | |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 7594 | ret = btrfs_reserve_extent(trans, root, num_bytes, min_size, |
Josef Bacik | 81c9ad2 | 2012-01-18 10:56:06 -0500 | [diff] [blame] | 7595 | 0, *alloc_hint, &ins, 1); |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7596 | if (ret) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7597 | if (own_trans) |
| 7598 | btrfs_end_transaction(trans, root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 7599 | break; |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7600 | } |
| 7601 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7602 | ret = insert_reserved_file_extent(trans, inode, |
| 7603 | cur_offset, ins.objectid, |
| 7604 | ins.offset, ins.offset, |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 7605 | ins.offset, 0, 0, 0, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7606 | BTRFS_FILE_EXTENT_PREALLOC); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7607 | if (ret) { |
| 7608 | btrfs_abort_transaction(trans, root, ret); |
| 7609 | if (own_trans) |
| 7610 | btrfs_end_transaction(trans, root); |
| 7611 | break; |
| 7612 | } |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 7613 | btrfs_drop_extent_cache(inode, cur_offset, |
| 7614 | cur_offset + ins.offset -1, 0); |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7615 | |
Josef Bacik | 5dc562c | 2012-08-17 13:14:17 -0400 | [diff] [blame] | 7616 | em = alloc_extent_map(); |
| 7617 | if (!em) { |
| 7618 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
| 7619 | &BTRFS_I(inode)->runtime_flags); |
| 7620 | goto next; |
| 7621 | } |
| 7622 | |
| 7623 | em->start = cur_offset; |
| 7624 | em->orig_start = cur_offset; |
| 7625 | em->len = ins.offset; |
| 7626 | em->block_start = ins.objectid; |
| 7627 | em->block_len = ins.offset; |
| 7628 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
| 7629 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); |
| 7630 | em->generation = trans->transid; |
| 7631 | |
| 7632 | while (1) { |
| 7633 | write_lock(&em_tree->lock); |
| 7634 | ret = add_extent_mapping(em_tree, em); |
| 7635 | if (!ret) |
| 7636 | list_move(&em->list, |
| 7637 | &em_tree->modified_extents); |
| 7638 | write_unlock(&em_tree->lock); |
| 7639 | if (ret != -EEXIST) |
| 7640 | break; |
| 7641 | btrfs_drop_extent_cache(inode, cur_offset, |
| 7642 | cur_offset + ins.offset - 1, |
| 7643 | 0); |
| 7644 | } |
| 7645 | free_extent_map(em); |
| 7646 | next: |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7647 | num_bytes -= ins.offset; |
| 7648 | cur_offset += ins.offset; |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 7649 | *alloc_hint = ins.objectid + ins.offset; |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7650 | |
Josef Bacik | 0c4d2d9 | 2012-04-05 15:03:02 -0400 | [diff] [blame] | 7651 | inode_inc_iversion(inode); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7652 | inode->i_ctime = CURRENT_TIME; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 7653 | BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7654 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 7655 | (actual_len > inode->i_size) && |
| 7656 | (cur_offset > inode->i_size)) { |
Aneesh Kumar K.V | d1ea6a6 | 2010-01-20 07:28:54 +0000 | [diff] [blame] | 7657 | if (cur_offset > actual_len) |
Josef Bacik | 55a61d1 | 2010-11-22 18:50:32 +0000 | [diff] [blame] | 7658 | i_size = actual_len; |
Aneesh Kumar K.V | d1ea6a6 | 2010-01-20 07:28:54 +0000 | [diff] [blame] | 7659 | else |
Josef Bacik | 55a61d1 | 2010-11-22 18:50:32 +0000 | [diff] [blame] | 7660 | i_size = cur_offset; |
| 7661 | i_size_write(inode, i_size); |
| 7662 | btrfs_ordered_update_i_size(inode, i_size, NULL); |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7663 | } |
| 7664 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7665 | ret = btrfs_update_inode(trans, root, inode); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 7666 | |
| 7667 | if (ret) { |
| 7668 | btrfs_abort_transaction(trans, root, ret); |
| 7669 | if (own_trans) |
| 7670 | btrfs_end_transaction(trans, root); |
| 7671 | break; |
| 7672 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7673 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7674 | if (own_trans) |
| 7675 | btrfs_end_transaction(trans, root); |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7676 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7677 | return ret; |
| 7678 | } |
| 7679 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7680 | int btrfs_prealloc_file_range(struct inode *inode, int mode, |
| 7681 | u64 start, u64 num_bytes, u64 min_size, |
| 7682 | loff_t actual_len, u64 *alloc_hint) |
| 7683 | { |
| 7684 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, |
| 7685 | min_size, actual_len, alloc_hint, |
| 7686 | NULL); |
| 7687 | } |
| 7688 | |
| 7689 | int btrfs_prealloc_file_range_trans(struct inode *inode, |
| 7690 | struct btrfs_trans_handle *trans, int mode, |
| 7691 | u64 start, u64 num_bytes, u64 min_size, |
| 7692 | loff_t actual_len, u64 *alloc_hint) |
| 7693 | { |
| 7694 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, |
| 7695 | min_size, actual_len, alloc_hint, trans); |
| 7696 | } |
| 7697 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7698 | static int btrfs_set_page_dirty(struct page *page) |
| 7699 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7700 | return __set_page_dirty_nobuffers(page); |
| 7701 | } |
| 7702 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 7703 | static int btrfs_permission(struct inode *inode, int mask) |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7704 | { |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 7705 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Jeff Mahoney | cb6db4e | 2011-08-15 17:27:21 +0000 | [diff] [blame] | 7706 | umode_t mode = inode->i_mode; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 7707 | |
Jeff Mahoney | cb6db4e | 2011-08-15 17:27:21 +0000 | [diff] [blame] | 7708 | if (mask & MAY_WRITE && |
| 7709 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) { |
| 7710 | if (btrfs_root_readonly(root)) |
| 7711 | return -EROFS; |
| 7712 | if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) |
| 7713 | return -EACCES; |
| 7714 | } |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 7715 | return generic_permission(inode, mask); |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7716 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7717 | |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 7718 | static const struct inode_operations btrfs_dir_inode_operations = { |
Chris Mason | 3394e16 | 2008-11-17 20:42:26 -0500 | [diff] [blame] | 7719 | .getattr = btrfs_getattr, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7720 | .lookup = btrfs_lookup, |
| 7721 | .create = btrfs_create, |
| 7722 | .unlink = btrfs_unlink, |
| 7723 | .link = btrfs_link, |
| 7724 | .mkdir = btrfs_mkdir, |
| 7725 | .rmdir = btrfs_rmdir, |
| 7726 | .rename = btrfs_rename, |
| 7727 | .symlink = btrfs_symlink, |
| 7728 | .setattr = btrfs_setattr, |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 7729 | .mknod = btrfs_mknod, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 7730 | .setxattr = btrfs_setxattr, |
| 7731 | .getxattr = btrfs_getxattr, |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 7732 | .listxattr = btrfs_listxattr, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 7733 | .removexattr = btrfs_removexattr, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7734 | .permission = btrfs_permission, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 7735 | .get_acl = btrfs_get_acl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7736 | }; |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 7737 | static const struct inode_operations btrfs_dir_ro_inode_operations = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7738 | .lookup = btrfs_lookup, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7739 | .permission = btrfs_permission, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 7740 | .get_acl = btrfs_get_acl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7741 | }; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7742 | |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 7743 | static const struct file_operations btrfs_dir_file_operations = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7744 | .llseek = generic_file_llseek, |
| 7745 | .read = generic_read_dir, |
David Woodhouse | cbdf5a2 | 2008-08-06 19:42:33 +0100 | [diff] [blame] | 7746 | .readdir = btrfs_real_readdir, |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 7747 | .unlocked_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7748 | #ifdef CONFIG_COMPAT |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 7749 | .compat_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7750 | #endif |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 7751 | .release = btrfs_release_file, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7752 | .fsync = btrfs_sync_file, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7753 | }; |
| 7754 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 7755 | static struct extent_io_ops btrfs_extent_io_ops = { |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 7756 | .fill_delalloc = run_delalloc_range, |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 7757 | .submit_bio_hook = btrfs_submit_bio_hook, |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 7758 | .merge_bio_hook = btrfs_merge_bio_hook, |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 7759 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7760 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 7761 | .writepage_start_hook = btrfs_writepage_start_hook, |
Chris Mason | b0c68f8 | 2008-01-31 11:05:37 -0500 | [diff] [blame] | 7762 | .set_bit_hook = btrfs_set_bit_hook, |
| 7763 | .clear_bit_hook = btrfs_clear_bit_hook, |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 7764 | .merge_extent_hook = btrfs_merge_extent_hook, |
| 7765 | .split_extent_hook = btrfs_split_extent_hook, |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 7766 | }; |
| 7767 | |
Chris Mason | 3505439 | 2009-01-21 13:11:13 -0500 | [diff] [blame] | 7768 | /* |
| 7769 | * btrfs doesn't support the bmap operation because swapfiles |
| 7770 | * use bmap to make a mapping of extents in the file. They assume |
| 7771 | * these extents won't change over the life of the file and they |
| 7772 | * use the bmap result to do IO directly to the drive. |
| 7773 | * |
| 7774 | * the btrfs bmap call would return logical addresses that aren't |
| 7775 | * suitable for IO and they also will change frequently as COW |
| 7776 | * operations happen. So, swapfile + btrfs == corruption. |
| 7777 | * |
| 7778 | * For now we're avoiding this by dropping bmap. |
| 7779 | */ |
Alexey Dobriyan | 7f09410 | 2009-09-21 17:01:10 -0700 | [diff] [blame] | 7780 | static const struct address_space_operations btrfs_aops = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7781 | .readpage = btrfs_readpage, |
| 7782 | .writepage = btrfs_writepage, |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 7783 | .writepages = btrfs_writepages, |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 7784 | .readpages = btrfs_readpages, |
Chris Mason | 1643298 | 2008-04-10 10:23:21 -0400 | [diff] [blame] | 7785 | .direct_IO = btrfs_direct_IO, |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 7786 | .invalidatepage = btrfs_invalidatepage, |
| 7787 | .releasepage = btrfs_releasepage, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7788 | .set_page_dirty = btrfs_set_page_dirty, |
Andi Kleen | 465fdd9 | 2009-09-16 11:50:18 +0200 | [diff] [blame] | 7789 | .error_remove_page = generic_error_remove_page, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7790 | }; |
| 7791 | |
Alexey Dobriyan | 7f09410 | 2009-09-21 17:01:10 -0700 | [diff] [blame] | 7792 | static const struct address_space_operations btrfs_symlink_aops = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7793 | .readpage = btrfs_readpage, |
| 7794 | .writepage = btrfs_writepage, |
Chris Mason | 2bf5a72 | 2007-08-30 11:54:02 -0400 | [diff] [blame] | 7795 | .invalidatepage = btrfs_invalidatepage, |
| 7796 | .releasepage = btrfs_releasepage, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7797 | }; |
| 7798 | |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 7799 | static const struct inode_operations btrfs_file_inode_operations = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7800 | .getattr = btrfs_getattr, |
| 7801 | .setattr = btrfs_setattr, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 7802 | .setxattr = btrfs_setxattr, |
| 7803 | .getxattr = btrfs_getxattr, |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 7804 | .listxattr = btrfs_listxattr, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 7805 | .removexattr = btrfs_removexattr, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7806 | .permission = btrfs_permission, |
Yehuda Sadeh | 1506fcc | 2009-01-21 14:39:14 -0500 | [diff] [blame] | 7807 | .fiemap = btrfs_fiemap, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 7808 | .get_acl = btrfs_get_acl, |
Josef Bacik | e41f941 | 2012-03-26 09:46:47 -0400 | [diff] [blame] | 7809 | .update_time = btrfs_update_time, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7810 | }; |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 7811 | static const struct inode_operations btrfs_special_inode_operations = { |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 7812 | .getattr = btrfs_getattr, |
| 7813 | .setattr = btrfs_setattr, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7814 | .permission = btrfs_permission, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 7815 | .setxattr = btrfs_setxattr, |
| 7816 | .getxattr = btrfs_getxattr, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 7817 | .listxattr = btrfs_listxattr, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 7818 | .removexattr = btrfs_removexattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 7819 | .get_acl = btrfs_get_acl, |
Josef Bacik | e41f941 | 2012-03-26 09:46:47 -0400 | [diff] [blame] | 7820 | .update_time = btrfs_update_time, |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 7821 | }; |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 7822 | static const struct inode_operations btrfs_symlink_inode_operations = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7823 | .readlink = generic_readlink, |
| 7824 | .follow_link = page_follow_link_light, |
| 7825 | .put_link = page_put_link, |
Li Zefan | f209561 | 2010-11-19 02:05:24 +0000 | [diff] [blame] | 7826 | .getattr = btrfs_getattr, |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 7827 | .setattr = btrfs_setattr, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7828 | .permission = btrfs_permission, |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 7829 | .setxattr = btrfs_setxattr, |
| 7830 | .getxattr = btrfs_getxattr, |
| 7831 | .listxattr = btrfs_listxattr, |
| 7832 | .removexattr = btrfs_removexattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 7833 | .get_acl = btrfs_get_acl, |
Josef Bacik | e41f941 | 2012-03-26 09:46:47 -0400 | [diff] [blame] | 7834 | .update_time = btrfs_update_time, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7835 | }; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7836 | |
Alexey Dobriyan | 82d339d | 2009-10-09 09:54:36 -0400 | [diff] [blame] | 7837 | const struct dentry_operations btrfs_dentry_operations = { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7838 | .d_delete = btrfs_dentry_delete, |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 7839 | .d_release = btrfs_dentry_release, |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7840 | }; |