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); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 92 | static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end); |
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); |
| 153 | BUG_ON(ret); |
| 154 | if (ret) { |
| 155 | err = ret; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 156 | goto fail; |
| 157 | } |
| 158 | leaf = path->nodes[0]; |
| 159 | ei = btrfs_item_ptr(leaf, path->slots[0], |
| 160 | struct btrfs_file_extent_item); |
| 161 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); |
| 162 | btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); |
| 163 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
| 164 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); |
| 165 | btrfs_set_file_extent_ram_bytes(leaf, ei, size); |
| 166 | ptr = btrfs_file_extent_inline_start(ei); |
| 167 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 168 | if (compress_type != BTRFS_COMPRESS_NONE) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 169 | struct page *cpage; |
| 170 | int i = 0; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 171 | while (compressed_size > 0) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 172 | cpage = compressed_pages[i]; |
Chris Mason | 5b050f0 | 2008-11-11 09:34:41 -0500 | [diff] [blame] | 173 | cur_size = min_t(unsigned long, compressed_size, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 174 | PAGE_CACHE_SIZE); |
| 175 | |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 176 | kaddr = kmap_atomic(cpage); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 177 | write_extent_buffer(leaf, kaddr, ptr, cur_size); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 178 | kunmap_atomic(kaddr); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 179 | |
| 180 | i++; |
| 181 | ptr += cur_size; |
| 182 | compressed_size -= cur_size; |
| 183 | } |
| 184 | btrfs_set_file_extent_compression(leaf, ei, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 185 | compress_type); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 186 | } else { |
| 187 | page = find_get_page(inode->i_mapping, |
| 188 | start >> PAGE_CACHE_SHIFT); |
| 189 | btrfs_set_file_extent_compression(leaf, ei, 0); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 190 | kaddr = kmap_atomic(page); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 191 | offset = start & (PAGE_CACHE_SIZE - 1); |
| 192 | write_extent_buffer(leaf, kaddr + offset, ptr, size); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 193 | kunmap_atomic(kaddr); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 194 | page_cache_release(page); |
| 195 | } |
| 196 | btrfs_mark_buffer_dirty(leaf); |
| 197 | btrfs_free_path(path); |
| 198 | |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 199 | /* |
| 200 | * we're an inline extent, so nobody can |
| 201 | * extend the file past i_size without locking |
| 202 | * a page we already have locked. |
| 203 | * |
| 204 | * We must do any isize and inode updates |
| 205 | * before we unlock the pages. Otherwise we |
| 206 | * could end up racing with unlink. |
| 207 | */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 208 | BTRFS_I(inode)->disk_i_size = inode->i_size; |
| 209 | btrfs_update_inode(trans, root, inode); |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 210 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 211 | return 0; |
| 212 | fail: |
| 213 | btrfs_free_path(path); |
| 214 | return err; |
| 215 | } |
| 216 | |
| 217 | |
| 218 | /* |
| 219 | * conditionally insert an inline extent into the file. This |
| 220 | * does the checks required to make sure the data is small enough |
| 221 | * to fit as an inline extent. |
| 222 | */ |
Chris Mason | 7f366cf | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 223 | static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 224 | struct btrfs_root *root, |
| 225 | struct inode *inode, u64 start, u64 end, |
Li Zefan | fe3f566 | 2011-03-28 08:30:38 +0000 | [diff] [blame] | 226 | size_t compressed_size, int compress_type, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 227 | struct page **compressed_pages) |
| 228 | { |
| 229 | u64 isize = i_size_read(inode); |
| 230 | u64 actual_end = min(end + 1, isize); |
| 231 | u64 inline_len = actual_end - start; |
| 232 | u64 aligned_end = (end + root->sectorsize - 1) & |
| 233 | ~((u64)root->sectorsize - 1); |
| 234 | u64 hint_byte; |
| 235 | u64 data_len = inline_len; |
| 236 | int ret; |
| 237 | |
| 238 | if (compressed_size) |
| 239 | data_len = compressed_size; |
| 240 | |
| 241 | if (start > 0 || |
Chris Mason | 70b99e6 | 2008-10-31 12:46:39 -0400 | [diff] [blame] | 242 | actual_end >= PAGE_CACHE_SIZE || |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 243 | data_len >= BTRFS_MAX_INLINE_DATA_SIZE(root) || |
| 244 | (!compressed_size && |
| 245 | (actual_end & (root->sectorsize - 1)) == 0) || |
| 246 | end + 1 < isize || |
| 247 | data_len > root->fs_info->max_inline) { |
| 248 | return 1; |
| 249 | } |
| 250 | |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 251 | ret = btrfs_drop_extents(trans, inode, start, aligned_end, |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 252 | &hint_byte, 1); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 253 | BUG_ON(ret); |
| 254 | |
| 255 | if (isize > actual_end) |
| 256 | inline_len = min_t(u64, isize, actual_end); |
| 257 | ret = insert_inline_extent(trans, root, inode, start, |
| 258 | inline_len, compressed_size, |
Li Zefan | fe3f566 | 2011-03-28 08:30:38 +0000 | [diff] [blame] | 259 | compress_type, compressed_pages); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 260 | BUG_ON(ret); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 261 | btrfs_delalloc_release_metadata(inode, end + 1 - start); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 262 | btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 263 | return 0; |
| 264 | } |
| 265 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 266 | struct async_extent { |
| 267 | u64 start; |
| 268 | u64 ram_size; |
| 269 | u64 compressed_size; |
| 270 | struct page **pages; |
| 271 | unsigned long nr_pages; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 272 | int compress_type; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 273 | struct list_head list; |
| 274 | }; |
| 275 | |
| 276 | struct async_cow { |
| 277 | struct inode *inode; |
| 278 | struct btrfs_root *root; |
| 279 | struct page *locked_page; |
| 280 | u64 start; |
| 281 | u64 end; |
| 282 | struct list_head extents; |
| 283 | struct btrfs_work work; |
| 284 | }; |
| 285 | |
| 286 | static noinline int add_async_extent(struct async_cow *cow, |
| 287 | u64 start, u64 ram_size, |
| 288 | u64 compressed_size, |
| 289 | struct page **pages, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 290 | unsigned long nr_pages, |
| 291 | int compress_type) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 292 | { |
| 293 | struct async_extent *async_extent; |
| 294 | |
| 295 | async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS); |
Yoshinori Sano | dac97e5 | 2011-02-15 12:01:42 +0000 | [diff] [blame] | 296 | BUG_ON(!async_extent); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 297 | async_extent->start = start; |
| 298 | async_extent->ram_size = ram_size; |
| 299 | async_extent->compressed_size = compressed_size; |
| 300 | async_extent->pages = pages; |
| 301 | async_extent->nr_pages = nr_pages; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 302 | async_extent->compress_type = compress_type; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 303 | list_add_tail(&async_extent->list, &cow->extents); |
| 304 | return 0; |
| 305 | } |
| 306 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 307 | /* |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 308 | * we create compressed extents in two phases. The first |
| 309 | * phase compresses a range of pages that have already been |
| 310 | * locked (both pages and state bits are locked). |
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 | * This is done inside an ordered work queue, and the compression |
| 313 | * is spread across many cpus. The actual IO submission is step |
| 314 | * two, and the ordered work queue takes care of making sure that |
| 315 | * happens in the same order things were put onto the queue by |
| 316 | * writepages and friends. |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 317 | * |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 318 | * If this code finds it can't get good compression, it puts an |
| 319 | * entry onto the work queue to write the uncompressed bytes. This |
| 320 | * makes sure that both compressed inodes and uncompressed inodes |
| 321 | * are written in the same order that pdflush sent them down. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 322 | */ |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 323 | static noinline int compress_file_range(struct inode *inode, |
| 324 | struct page *locked_page, |
| 325 | u64 start, u64 end, |
| 326 | struct async_cow *async_cow, |
| 327 | int *num_added) |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 328 | { |
| 329 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 330 | struct btrfs_trans_handle *trans; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 331 | u64 num_bytes; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 332 | u64 blocksize = root->sectorsize; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 333 | u64 actual_end; |
Chris Mason | 42dc7ba | 2008-12-15 11:44:56 -0500 | [diff] [blame] | 334 | u64 isize = i_size_read(inode); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 335 | int ret = 0; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 336 | struct page **pages = NULL; |
| 337 | unsigned long nr_pages; |
| 338 | unsigned long nr_pages_ret = 0; |
| 339 | unsigned long total_compressed = 0; |
| 340 | unsigned long total_in = 0; |
| 341 | unsigned long max_compressed = 128 * 1024; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 342 | unsigned long max_uncompressed = 128 * 1024; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 343 | int i; |
| 344 | int will_compress; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 345 | int compress_type = root->fs_info->compress_type; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 346 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 347 | /* if this is a small write inside eof, kick off a defragbot */ |
| 348 | if (end <= BTRFS_I(inode)->disk_i_size && (end - start + 1) < 16 * 1024) |
| 349 | btrfs_add_inode_defrag(NULL, inode); |
| 350 | |
Chris Mason | 42dc7ba | 2008-12-15 11:44:56 -0500 | [diff] [blame] | 351 | actual_end = min_t(u64, isize, end + 1); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 352 | again: |
| 353 | will_compress = 0; |
| 354 | nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1; |
| 355 | nr_pages = min(nr_pages, (128 * 1024UL) / PAGE_CACHE_SIZE); |
| 356 | |
Chris Mason | f03d930 | 2009-02-04 09:31:06 -0500 | [diff] [blame] | 357 | /* |
| 358 | * we don't want to send crud past the end of i_size through |
| 359 | * compression, that's just a waste of CPU time. So, if the |
| 360 | * end of the file is before the start of our current |
| 361 | * requested range of bytes, we bail out to the uncompressed |
| 362 | * cleanup code that can deal with all of this. |
| 363 | * |
| 364 | * It isn't really the fastest way to fix things, but this is a |
| 365 | * very uncommon corner. |
| 366 | */ |
| 367 | if (actual_end <= start) |
| 368 | goto cleanup_and_bail_uncompressed; |
| 369 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 370 | total_compressed = actual_end - start; |
| 371 | |
| 372 | /* we want to make sure that amount of ram required to uncompress |
| 373 | * an extent is reasonable, so we limit the total size in ram |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 374 | * of a compressed extent to 128k. This is a crucial number |
| 375 | * because it also controls how easily we can spread reads across |
| 376 | * cpus for decompression. |
| 377 | * |
| 378 | * We also want to make sure the amount of IO required to do |
| 379 | * a random read is reasonably small, so we limit the size of |
| 380 | * a compressed extent to 128k. |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 381 | */ |
| 382 | total_compressed = min(total_compressed, max_uncompressed); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 383 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 384 | num_bytes = max(blocksize, num_bytes); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 385 | total_in = 0; |
| 386 | ret = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 387 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 388 | /* |
| 389 | * we do compression for mount -o compress and when the |
| 390 | * inode has not been flagged as nocompress. This flag can |
| 391 | * change at any time if we discover bad compression ratios. |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 392 | */ |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 393 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) && |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 394 | (btrfs_test_opt(root, COMPRESS) || |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 395 | (BTRFS_I(inode)->force_compress) || |
| 396 | (BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS))) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 397 | WARN_ON(pages); |
Chris Mason | cfbc246 | 2008-10-30 13:22:14 -0400 | [diff] [blame] | 398 | pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS); |
Li Zefan | 560f7d7 | 2011-09-08 10:22:01 +0800 | [diff] [blame] | 399 | if (!pages) { |
| 400 | /* just bail out to the uncompressed code */ |
| 401 | goto cont; |
| 402 | } |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 403 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 404 | if (BTRFS_I(inode)->force_compress) |
| 405 | compress_type = BTRFS_I(inode)->force_compress; |
| 406 | |
| 407 | ret = btrfs_compress_pages(compress_type, |
| 408 | inode->i_mapping, start, |
| 409 | total_compressed, pages, |
| 410 | nr_pages, &nr_pages_ret, |
| 411 | &total_in, |
| 412 | &total_compressed, |
| 413 | max_compressed); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 414 | |
| 415 | if (!ret) { |
| 416 | unsigned long offset = total_compressed & |
| 417 | (PAGE_CACHE_SIZE - 1); |
| 418 | struct page *page = pages[nr_pages_ret - 1]; |
| 419 | char *kaddr; |
| 420 | |
| 421 | /* zero the tail end of the last page, we might be |
| 422 | * sending it down to disk |
| 423 | */ |
| 424 | if (offset) { |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 425 | kaddr = kmap_atomic(page); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 426 | memset(kaddr + offset, 0, |
| 427 | PAGE_CACHE_SIZE - offset); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 428 | kunmap_atomic(kaddr); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 429 | } |
| 430 | will_compress = 1; |
| 431 | } |
| 432 | } |
Li Zefan | 560f7d7 | 2011-09-08 10:22:01 +0800 | [diff] [blame] | 433 | cont: |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 434 | if (start == 0) { |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 435 | trans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 436 | BUG_ON(IS_ERR(trans)); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 437 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 438 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 439 | /* lets try to make an inline extent */ |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 440 | if (ret || total_in < (actual_end - start)) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 441 | /* we didn't compress the entire range, try |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 442 | * to make an uncompressed inline extent. |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 443 | */ |
| 444 | ret = cow_file_range_inline(trans, root, inode, |
Li Zefan | fe3f566 | 2011-03-28 08:30:38 +0000 | [diff] [blame] | 445 | start, end, 0, 0, NULL); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 446 | } else { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 447 | /* try making a compressed inline extent */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 448 | ret = cow_file_range_inline(trans, root, inode, |
| 449 | start, end, |
Li Zefan | fe3f566 | 2011-03-28 08:30:38 +0000 | [diff] [blame] | 450 | total_compressed, |
| 451 | compress_type, pages); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 452 | } |
| 453 | if (ret == 0) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 454 | /* |
| 455 | * inline extent creation worked, we don't need |
| 456 | * to create any more async work items. Unlock |
| 457 | * and free up our temp pages. |
| 458 | */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 459 | extent_clear_unlock_delalloc(inode, |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 460 | &BTRFS_I(inode)->io_tree, |
| 461 | start, end, NULL, |
| 462 | EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY | |
Chris Mason | a3429ab | 2009-10-08 12:30:20 -0400 | [diff] [blame] | 463 | EXTENT_CLEAR_DELALLOC | |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 464 | EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK); |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 465 | |
| 466 | btrfs_end_transaction(trans, root); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 467 | goto free_pages_out; |
| 468 | } |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 469 | btrfs_end_transaction(trans, root); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 470 | } |
| 471 | |
| 472 | if (will_compress) { |
| 473 | /* |
| 474 | * we aren't doing an inline extent round the compressed size |
| 475 | * up to a block size boundary so the allocator does sane |
| 476 | * things |
| 477 | */ |
| 478 | total_compressed = (total_compressed + blocksize - 1) & |
| 479 | ~(blocksize - 1); |
| 480 | |
| 481 | /* |
| 482 | * one last check to make sure the compression is really a |
| 483 | * win, compare the page count read with the blocks on disk |
| 484 | */ |
| 485 | total_in = (total_in + PAGE_CACHE_SIZE - 1) & |
| 486 | ~(PAGE_CACHE_SIZE - 1); |
| 487 | if (total_compressed >= total_in) { |
| 488 | will_compress = 0; |
| 489 | } else { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 490 | num_bytes = total_in; |
| 491 | } |
| 492 | } |
| 493 | if (!will_compress && pages) { |
| 494 | /* |
| 495 | * the compression code ran but failed to make things smaller, |
| 496 | * free any pages it allocated and our page pointer array |
| 497 | */ |
| 498 | for (i = 0; i < nr_pages_ret; i++) { |
Chris Mason | 70b99e6 | 2008-10-31 12:46:39 -0400 | [diff] [blame] | 499 | WARN_ON(pages[i]->mapping); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 500 | page_cache_release(pages[i]); |
| 501 | } |
| 502 | kfree(pages); |
| 503 | pages = NULL; |
| 504 | total_compressed = 0; |
| 505 | nr_pages_ret = 0; |
| 506 | |
| 507 | /* flag the file so we don't compress in the future */ |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 508 | if (!btrfs_test_opt(root, FORCE_COMPRESS) && |
| 509 | !(BTRFS_I(inode)->force_compress)) { |
Chris Mason | a555f81 | 2010-01-28 16:18:15 -0500 | [diff] [blame] | 510 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 511 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 512 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 513 | if (will_compress) { |
| 514 | *num_added += 1; |
| 515 | |
| 516 | /* the async work queues will take care of doing actual |
| 517 | * allocation on disk for these compressed pages, |
| 518 | * and will submit them to the elevator. |
| 519 | */ |
| 520 | add_async_extent(async_cow, start, num_bytes, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 521 | total_compressed, pages, nr_pages_ret, |
| 522 | compress_type); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 523 | |
Yan, Zheng | 24ae636 | 2010-12-06 07:02:36 +0000 | [diff] [blame] | 524 | if (start + num_bytes < end) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 525 | start += num_bytes; |
| 526 | pages = NULL; |
| 527 | cond_resched(); |
| 528 | goto again; |
| 529 | } |
| 530 | } else { |
Chris Mason | f03d930 | 2009-02-04 09:31:06 -0500 | [diff] [blame] | 531 | cleanup_and_bail_uncompressed: |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 532 | /* |
| 533 | * No compression, but we still need to write the pages in |
| 534 | * the file we've been given so far. redirty the locked |
| 535 | * page if it corresponds to our extent and set things up |
| 536 | * for the async work queue to run cow_file_range to do |
| 537 | * the normal delalloc dance |
| 538 | */ |
| 539 | if (page_offset(locked_page) >= start && |
| 540 | page_offset(locked_page) <= end) { |
| 541 | __set_page_dirty_nobuffers(locked_page); |
| 542 | /* unlocked later on in the async handlers */ |
| 543 | } |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 544 | add_async_extent(async_cow, start, end - start + 1, |
| 545 | 0, NULL, 0, BTRFS_COMPRESS_NONE); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 546 | *num_added += 1; |
| 547 | } |
| 548 | |
| 549 | out: |
| 550 | return 0; |
| 551 | |
| 552 | free_pages_out: |
| 553 | for (i = 0; i < nr_pages_ret; i++) { |
| 554 | WARN_ON(pages[i]->mapping); |
| 555 | page_cache_release(pages[i]); |
| 556 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 557 | kfree(pages); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 558 | |
| 559 | goto out; |
| 560 | } |
| 561 | |
| 562 | /* |
| 563 | * phase two of compressed writeback. This is the ordered portion |
| 564 | * of the code, which only gets called in the order the work was |
| 565 | * queued. We walk all the async extents created by compress_file_range |
| 566 | * and send them down to the disk. |
| 567 | */ |
| 568 | static noinline int submit_compressed_extents(struct inode *inode, |
| 569 | struct async_cow *async_cow) |
| 570 | { |
| 571 | struct async_extent *async_extent; |
| 572 | u64 alloc_hint = 0; |
| 573 | struct btrfs_trans_handle *trans; |
| 574 | struct btrfs_key ins; |
| 575 | struct extent_map *em; |
| 576 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 577 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 578 | struct extent_io_tree *io_tree; |
Josef Bacik | f5a84ee3 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 579 | int ret = 0; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 580 | |
| 581 | if (list_empty(&async_cow->extents)) |
| 582 | return 0; |
| 583 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 584 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 585 | while (!list_empty(&async_cow->extents)) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 586 | async_extent = list_entry(async_cow->extents.next, |
| 587 | struct async_extent, list); |
| 588 | list_del(&async_extent->list); |
| 589 | |
| 590 | io_tree = &BTRFS_I(inode)->io_tree; |
| 591 | |
Josef Bacik | f5a84ee3 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 592 | retry: |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 593 | /* did the compression code fall back to uncompressed IO? */ |
| 594 | if (!async_extent->pages) { |
| 595 | int page_started = 0; |
| 596 | unsigned long nr_written = 0; |
| 597 | |
| 598 | lock_extent(io_tree, async_extent->start, |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 599 | async_extent->start + |
| 600 | async_extent->ram_size - 1, GFP_NOFS); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 601 | |
| 602 | /* allocate blocks */ |
Josef Bacik | f5a84ee3 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 603 | ret = cow_file_range(inode, async_cow->locked_page, |
| 604 | async_extent->start, |
| 605 | async_extent->start + |
| 606 | async_extent->ram_size - 1, |
| 607 | &page_started, &nr_written, 0); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 608 | |
| 609 | /* |
| 610 | * if page_started, cow_file_range inserted an |
| 611 | * inline extent and took care of all the unlocking |
| 612 | * and IO for us. Otherwise, we need to submit |
| 613 | * all those pages down to the drive. |
| 614 | */ |
Josef Bacik | f5a84ee3 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 615 | if (!page_started && !ret) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 616 | extent_write_locked_range(io_tree, |
| 617 | inode, async_extent->start, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 618 | async_extent->start + |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 619 | async_extent->ram_size - 1, |
| 620 | btrfs_get_extent, |
| 621 | WB_SYNC_ALL); |
| 622 | kfree(async_extent); |
| 623 | cond_resched(); |
| 624 | continue; |
| 625 | } |
| 626 | |
| 627 | lock_extent(io_tree, async_extent->start, |
| 628 | async_extent->start + async_extent->ram_size - 1, |
| 629 | GFP_NOFS); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 630 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 631 | trans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 632 | BUG_ON(IS_ERR(trans)); |
Josef Bacik | 74b2107 | 2011-04-13 12:02:53 -0400 | [diff] [blame] | 633 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 634 | ret = btrfs_reserve_extent(trans, root, |
| 635 | async_extent->compressed_size, |
| 636 | async_extent->compressed_size, |
| 637 | 0, alloc_hint, |
| 638 | (u64)-1, &ins, 1); |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 639 | btrfs_end_transaction(trans, root); |
| 640 | |
Josef Bacik | f5a84ee3 | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 641 | if (ret) { |
| 642 | int i; |
| 643 | for (i = 0; i < async_extent->nr_pages; i++) { |
| 644 | WARN_ON(async_extent->pages[i]->mapping); |
| 645 | page_cache_release(async_extent->pages[i]); |
| 646 | } |
| 647 | kfree(async_extent->pages); |
| 648 | async_extent->nr_pages = 0; |
| 649 | async_extent->pages = NULL; |
| 650 | unlock_extent(io_tree, async_extent->start, |
| 651 | async_extent->start + |
| 652 | async_extent->ram_size - 1, GFP_NOFS); |
| 653 | goto retry; |
| 654 | } |
| 655 | |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 656 | /* |
| 657 | * here we're doing allocation and writeback of the |
| 658 | * compressed pages |
| 659 | */ |
| 660 | btrfs_drop_extent_cache(inode, async_extent->start, |
| 661 | async_extent->start + |
| 662 | async_extent->ram_size - 1, 0); |
| 663 | |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 664 | em = alloc_extent_map(); |
Tsutomu Itoh | c26a920 | 2011-02-14 00:45:29 +0000 | [diff] [blame] | 665 | BUG_ON(!em); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 666 | em->start = async_extent->start; |
| 667 | em->len = async_extent->ram_size; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 668 | em->orig_start = em->start; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 669 | |
| 670 | em->block_start = ins.objectid; |
| 671 | em->block_len = ins.offset; |
| 672 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 673 | em->compress_type = async_extent->compress_type; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 674 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
| 675 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
| 676 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 677 | while (1) { |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 678 | write_lock(&em_tree->lock); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 679 | ret = add_extent_mapping(em_tree, em); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 680 | write_unlock(&em_tree->lock); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 681 | if (ret != -EEXIST) { |
| 682 | free_extent_map(em); |
| 683 | break; |
| 684 | } |
| 685 | btrfs_drop_extent_cache(inode, async_extent->start, |
| 686 | async_extent->start + |
| 687 | async_extent->ram_size - 1, 0); |
| 688 | } |
| 689 | |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 690 | ret = btrfs_add_ordered_extent_compress(inode, |
| 691 | async_extent->start, |
| 692 | ins.objectid, |
| 693 | async_extent->ram_size, |
| 694 | ins.offset, |
| 695 | BTRFS_ORDERED_COMPRESSED, |
| 696 | async_extent->compress_type); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 697 | BUG_ON(ret); |
| 698 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 699 | /* |
| 700 | * clear dirty, set writeback and unlock the pages. |
| 701 | */ |
| 702 | extent_clear_unlock_delalloc(inode, |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 703 | &BTRFS_I(inode)->io_tree, |
| 704 | async_extent->start, |
| 705 | async_extent->start + |
| 706 | async_extent->ram_size - 1, |
| 707 | NULL, EXTENT_CLEAR_UNLOCK_PAGE | |
| 708 | EXTENT_CLEAR_UNLOCK | |
Chris Mason | a3429ab | 2009-10-08 12:30:20 -0400 | [diff] [blame] | 709 | EXTENT_CLEAR_DELALLOC | |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 710 | EXTENT_CLEAR_DIRTY | EXTENT_SET_WRITEBACK); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 711 | |
| 712 | ret = btrfs_submit_compressed_write(inode, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 713 | async_extent->start, |
| 714 | async_extent->ram_size, |
| 715 | ins.objectid, |
| 716 | ins.offset, async_extent->pages, |
| 717 | async_extent->nr_pages); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 718 | |
| 719 | BUG_ON(ret); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 720 | alloc_hint = ins.objectid + ins.offset; |
| 721 | kfree(async_extent); |
| 722 | cond_resched(); |
| 723 | } |
| 724 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 725 | return 0; |
| 726 | } |
| 727 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 728 | static u64 get_extent_allocation_hint(struct inode *inode, u64 start, |
| 729 | u64 num_bytes) |
| 730 | { |
| 731 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 732 | struct extent_map *em; |
| 733 | u64 alloc_hint = 0; |
| 734 | |
| 735 | read_lock(&em_tree->lock); |
| 736 | em = search_extent_mapping(em_tree, start, num_bytes); |
| 737 | if (em) { |
| 738 | /* |
| 739 | * if block start isn't an actual block number then find the |
| 740 | * first block in this inode and use that as a hint. If that |
| 741 | * block is also bogus then just don't worry about it. |
| 742 | */ |
| 743 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
| 744 | free_extent_map(em); |
| 745 | em = search_extent_mapping(em_tree, 0, 0); |
| 746 | if (em && em->block_start < EXTENT_MAP_LAST_BYTE) |
| 747 | alloc_hint = em->block_start; |
| 748 | if (em) |
| 749 | free_extent_map(em); |
| 750 | } else { |
| 751 | alloc_hint = em->block_start; |
| 752 | free_extent_map(em); |
| 753 | } |
| 754 | } |
| 755 | read_unlock(&em_tree->lock); |
| 756 | |
| 757 | return alloc_hint; |
| 758 | } |
| 759 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 760 | /* |
| 761 | * when extent_io.c finds a delayed allocation range in the file, |
| 762 | * the call backs end up in this code. The basic idea is to |
| 763 | * allocate extents on disk for the range, and create ordered data structs |
| 764 | * in ram to track those extents. |
| 765 | * |
| 766 | * locked_page is the page that writepage had locked already. We use |
| 767 | * it to make sure we don't do extra locks or unlocks. |
| 768 | * |
| 769 | * *page_started is set to one if we unlock locked_page and do everything |
| 770 | * required to start IO on it. It may be clean and already done with |
| 771 | * IO when we return. |
| 772 | */ |
| 773 | static noinline int cow_file_range(struct inode *inode, |
| 774 | struct page *locked_page, |
| 775 | u64 start, u64 end, int *page_started, |
| 776 | unsigned long *nr_written, |
| 777 | int unlock) |
| 778 | { |
| 779 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 780 | struct btrfs_trans_handle *trans; |
| 781 | u64 alloc_hint = 0; |
| 782 | u64 num_bytes; |
| 783 | unsigned long ram_size; |
| 784 | u64 disk_num_bytes; |
| 785 | u64 cur_alloc_size; |
| 786 | u64 blocksize = root->sectorsize; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 787 | struct btrfs_key ins; |
| 788 | struct extent_map *em; |
| 789 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 790 | int ret = 0; |
| 791 | |
Chris Mason | 2cf8572 | 2011-07-26 15:35:09 -0400 | [diff] [blame] | 792 | BUG_ON(btrfs_is_free_space_inode(root, inode)); |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 793 | trans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 794 | BUG_ON(IS_ERR(trans)); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 795 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 796 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 797 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
| 798 | num_bytes = max(blocksize, num_bytes); |
| 799 | disk_num_bytes = num_bytes; |
| 800 | ret = 0; |
| 801 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 802 | /* if this is a small write inside eof, kick off defrag */ |
| 803 | if (end <= BTRFS_I(inode)->disk_i_size && num_bytes < 64 * 1024) |
| 804 | btrfs_add_inode_defrag(trans, inode); |
| 805 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 806 | if (start == 0) { |
| 807 | /* lets try to make an inline extent */ |
| 808 | ret = cow_file_range_inline(trans, root, inode, |
Li Zefan | fe3f566 | 2011-03-28 08:30:38 +0000 | [diff] [blame] | 809 | start, end, 0, 0, NULL); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 810 | if (ret == 0) { |
| 811 | extent_clear_unlock_delalloc(inode, |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 812 | &BTRFS_I(inode)->io_tree, |
| 813 | start, end, NULL, |
| 814 | EXTENT_CLEAR_UNLOCK_PAGE | |
| 815 | EXTENT_CLEAR_UNLOCK | |
| 816 | EXTENT_CLEAR_DELALLOC | |
| 817 | EXTENT_CLEAR_DIRTY | |
| 818 | EXTENT_SET_WRITEBACK | |
| 819 | EXTENT_END_WRITEBACK); |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 820 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 821 | *nr_written = *nr_written + |
| 822 | (end - start + PAGE_CACHE_SIZE) / PAGE_CACHE_SIZE; |
| 823 | *page_started = 1; |
| 824 | ret = 0; |
| 825 | goto out; |
| 826 | } |
| 827 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 828 | |
| 829 | BUG_ON(disk_num_bytes > |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 830 | btrfs_super_total_bytes(root->fs_info->super_copy)); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 831 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 832 | alloc_hint = get_extent_allocation_hint(inode, start, num_bytes); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 833 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 834 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 835 | while (disk_num_bytes > 0) { |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 836 | unsigned long op; |
| 837 | |
Josef Bacik | 287a0ab | 2010-03-19 18:07:23 +0000 | [diff] [blame] | 838 | cur_alloc_size = disk_num_bytes; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 839 | ret = btrfs_reserve_extent(trans, root, cur_alloc_size, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 840 | root->sectorsize, 0, alloc_hint, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 841 | (u64)-1, &ins, 1); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 842 | BUG_ON(ret); |
| 843 | |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 844 | em = alloc_extent_map(); |
Tsutomu Itoh | c26a920 | 2011-02-14 00:45:29 +0000 | [diff] [blame] | 845 | BUG_ON(!em); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 846 | em->start = start; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 847 | em->orig_start = em->start; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 848 | ram_size = ins.offset; |
| 849 | em->len = ins.offset; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 850 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 851 | em->block_start = ins.objectid; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 852 | em->block_len = ins.offset; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 853 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Chris Mason | 7f3c74f | 2008-07-18 12:01:11 -0400 | [diff] [blame] | 854 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 855 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 856 | while (1) { |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 857 | write_lock(&em_tree->lock); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 858 | ret = add_extent_mapping(em_tree, em); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 859 | write_unlock(&em_tree->lock); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 860 | if (ret != -EEXIST) { |
| 861 | free_extent_map(em); |
| 862 | break; |
| 863 | } |
| 864 | btrfs_drop_extent_cache(inode, start, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 865 | start + ram_size - 1, 0); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 866 | } |
| 867 | |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 868 | cur_alloc_size = ins.offset; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 869 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 870 | ram_size, cur_alloc_size, 0); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 871 | BUG_ON(ret); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 872 | |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 873 | if (root->root_key.objectid == |
| 874 | BTRFS_DATA_RELOC_TREE_OBJECTID) { |
| 875 | ret = btrfs_reloc_clone_csums(inode, start, |
| 876 | cur_alloc_size); |
| 877 | BUG_ON(ret); |
| 878 | } |
| 879 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 880 | if (disk_num_bytes < cur_alloc_size) |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 881 | break; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 882 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 883 | /* we're not doing compressed IO, don't unlock the first |
| 884 | * page (which the caller expects to stay locked), don't |
| 885 | * clear any dirty bits and don't set any writeback bits |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 886 | * |
| 887 | * Do set the Private2 bit so we know this page was properly |
| 888 | * setup for writepage |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 889 | */ |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 890 | op = unlock ? EXTENT_CLEAR_UNLOCK_PAGE : 0; |
| 891 | op |= EXTENT_CLEAR_UNLOCK | EXTENT_CLEAR_DELALLOC | |
| 892 | EXTENT_SET_PRIVATE2; |
| 893 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 894 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
| 895 | start, start + ram_size - 1, |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 896 | locked_page, op); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 897 | disk_num_bytes -= cur_alloc_size; |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 898 | num_bytes -= cur_alloc_size; |
| 899 | alloc_hint = ins.objectid + ins.offset; |
| 900 | start += cur_alloc_size; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 901 | } |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 902 | out: |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 903 | ret = 0; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 904 | btrfs_end_transaction(trans, root); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 905 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 906 | return ret; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 907 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 908 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 909 | /* |
| 910 | * work queue call back to started compression on a file and pages |
| 911 | */ |
| 912 | static noinline void async_cow_start(struct btrfs_work *work) |
| 913 | { |
| 914 | struct async_cow *async_cow; |
| 915 | int num_added = 0; |
| 916 | async_cow = container_of(work, struct async_cow, work); |
| 917 | |
| 918 | compress_file_range(async_cow->inode, async_cow->locked_page, |
| 919 | async_cow->start, async_cow->end, async_cow, |
| 920 | &num_added); |
| 921 | if (num_added == 0) |
| 922 | async_cow->inode = NULL; |
| 923 | } |
| 924 | |
| 925 | /* |
| 926 | * work queue call back to submit previously compressed pages |
| 927 | */ |
| 928 | static noinline void async_cow_submit(struct btrfs_work *work) |
| 929 | { |
| 930 | struct async_cow *async_cow; |
| 931 | struct btrfs_root *root; |
| 932 | unsigned long nr_pages; |
| 933 | |
| 934 | async_cow = container_of(work, struct async_cow, work); |
| 935 | |
| 936 | root = async_cow->root; |
| 937 | nr_pages = (async_cow->end - async_cow->start + PAGE_CACHE_SIZE) >> |
| 938 | PAGE_CACHE_SHIFT; |
| 939 | |
| 940 | atomic_sub(nr_pages, &root->fs_info->async_delalloc_pages); |
| 941 | |
| 942 | if (atomic_read(&root->fs_info->async_delalloc_pages) < |
| 943 | 5 * 1042 * 1024 && |
| 944 | waitqueue_active(&root->fs_info->async_submit_wait)) |
| 945 | wake_up(&root->fs_info->async_submit_wait); |
| 946 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 947 | if (async_cow->inode) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 948 | submit_compressed_extents(async_cow->inode, async_cow); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 949 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 950 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 951 | static noinline void async_cow_free(struct btrfs_work *work) |
| 952 | { |
| 953 | struct async_cow *async_cow; |
| 954 | async_cow = container_of(work, struct async_cow, work); |
| 955 | kfree(async_cow); |
| 956 | } |
| 957 | |
| 958 | static int cow_file_range_async(struct inode *inode, struct page *locked_page, |
| 959 | u64 start, u64 end, int *page_started, |
| 960 | unsigned long *nr_written) |
| 961 | { |
| 962 | struct async_cow *async_cow; |
| 963 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 964 | unsigned long nr_pages; |
| 965 | u64 cur_end; |
| 966 | int limit = 10 * 1024 * 1042; |
| 967 | |
Chris Mason | a3429ab | 2009-10-08 12:30:20 -0400 | [diff] [blame] | 968 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED, |
| 969 | 1, 0, NULL, GFP_NOFS); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 970 | while (start < end) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 971 | async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS); |
Tsutomu Itoh | 8d41371 | 2011-04-25 19:43:52 -0400 | [diff] [blame] | 972 | BUG_ON(!async_cow); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 973 | async_cow->inode = inode; |
| 974 | async_cow->root = root; |
| 975 | async_cow->locked_page = locked_page; |
| 976 | async_cow->start = start; |
| 977 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 978 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 979 | cur_end = end; |
| 980 | else |
| 981 | cur_end = min(end, start + 512 * 1024 - 1); |
| 982 | |
| 983 | async_cow->end = cur_end; |
| 984 | INIT_LIST_HEAD(&async_cow->extents); |
| 985 | |
| 986 | async_cow->work.func = async_cow_start; |
| 987 | async_cow->work.ordered_func = async_cow_submit; |
| 988 | async_cow->work.ordered_free = async_cow_free; |
| 989 | async_cow->work.flags = 0; |
| 990 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 991 | nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >> |
| 992 | PAGE_CACHE_SHIFT; |
| 993 | atomic_add(nr_pages, &root->fs_info->async_delalloc_pages); |
| 994 | |
| 995 | btrfs_queue_worker(&root->fs_info->delalloc_workers, |
| 996 | &async_cow->work); |
| 997 | |
| 998 | if (atomic_read(&root->fs_info->async_delalloc_pages) > limit) { |
| 999 | wait_event(root->fs_info->async_submit_wait, |
| 1000 | (atomic_read(&root->fs_info->async_delalloc_pages) < |
| 1001 | limit)); |
| 1002 | } |
| 1003 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1004 | while (atomic_read(&root->fs_info->async_submit_draining) && |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1005 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
| 1006 | wait_event(root->fs_info->async_submit_wait, |
| 1007 | (atomic_read(&root->fs_info->async_delalloc_pages) == |
| 1008 | 0)); |
| 1009 | } |
| 1010 | |
| 1011 | *nr_written += nr_pages; |
| 1012 | start = cur_end + 1; |
| 1013 | } |
| 1014 | *page_started = 1; |
| 1015 | return 0; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1016 | } |
| 1017 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1018 | static noinline int csum_exist_in_range(struct btrfs_root *root, |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1019 | u64 bytenr, u64 num_bytes) |
| 1020 | { |
| 1021 | int ret; |
| 1022 | struct btrfs_ordered_sum *sums; |
| 1023 | LIST_HEAD(list); |
| 1024 | |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 1025 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, bytenr, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 1026 | bytenr + num_bytes - 1, &list, 0); |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1027 | if (ret == 0 && list_empty(&list)) |
| 1028 | return 0; |
| 1029 | |
| 1030 | while (!list_empty(&list)) { |
| 1031 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); |
| 1032 | list_del(&sums->list); |
| 1033 | kfree(sums); |
| 1034 | } |
| 1035 | return 1; |
| 1036 | } |
| 1037 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1038 | /* |
| 1039 | * when nowcow writeback call back. This checks for snapshots or COW copies |
| 1040 | * of the extents that exist in the file, and COWs the file as required. |
| 1041 | * |
| 1042 | * If no cow copies or snapshots exist, we write directly to the existing |
| 1043 | * blocks on disk |
| 1044 | */ |
Chris Mason | 7f366cf | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1045 | static noinline int run_delalloc_nocow(struct inode *inode, |
| 1046 | struct page *locked_page, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1047 | u64 start, u64 end, int *page_started, int force, |
| 1048 | unsigned long *nr_written) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1049 | { |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1050 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1051 | struct btrfs_trans_handle *trans; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1052 | struct extent_buffer *leaf; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1053 | struct btrfs_path *path; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1054 | struct btrfs_file_extent_item *fi; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1055 | struct btrfs_key found_key; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1056 | u64 cow_start; |
| 1057 | u64 cur_offset; |
| 1058 | u64 extent_end; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1059 | u64 extent_offset; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1060 | u64 disk_bytenr; |
| 1061 | u64 num_bytes; |
| 1062 | int extent_type; |
| 1063 | int ret; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1064 | int type; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1065 | int nocow; |
| 1066 | int check_prev = 1; |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1067 | bool nolock; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1068 | u64 ino = btrfs_ino(inode); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1069 | |
| 1070 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 1071 | if (!path) |
| 1072 | return -ENOMEM; |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1073 | |
Chris Mason | 2cf8572 | 2011-07-26 15:35:09 -0400 | [diff] [blame] | 1074 | nolock = btrfs_is_free_space_inode(root, inode); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1075 | |
| 1076 | if (nolock) |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1077 | trans = btrfs_join_transaction_nolock(root); |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1078 | else |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1079 | trans = btrfs_join_transaction(root); |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 1080 | |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 1081 | BUG_ON(IS_ERR(trans)); |
Josef Bacik | 74b2107 | 2011-04-13 12:02:53 -0400 | [diff] [blame] | 1082 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1083 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1084 | cow_start = (u64)-1; |
| 1085 | cur_offset = start; |
| 1086 | while (1) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1087 | ret = btrfs_lookup_file_extent(trans, root, path, ino, |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1088 | cur_offset, 0); |
| 1089 | BUG_ON(ret < 0); |
| 1090 | if (ret > 0 && path->slots[0] > 0 && check_prev) { |
| 1091 | leaf = path->nodes[0]; |
| 1092 | btrfs_item_key_to_cpu(leaf, &found_key, |
| 1093 | path->slots[0] - 1); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1094 | if (found_key.objectid == ino && |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1095 | found_key.type == BTRFS_EXTENT_DATA_KEY) |
| 1096 | path->slots[0]--; |
| 1097 | } |
| 1098 | check_prev = 0; |
| 1099 | next_slot: |
| 1100 | leaf = path->nodes[0]; |
| 1101 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 1102 | ret = btrfs_next_leaf(root, path); |
| 1103 | if (ret < 0) |
| 1104 | BUG_ON(1); |
| 1105 | if (ret > 0) |
| 1106 | break; |
| 1107 | leaf = path->nodes[0]; |
| 1108 | } |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1109 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1110 | nocow = 0; |
| 1111 | disk_bytenr = 0; |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1112 | num_bytes = 0; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1113 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1114 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1115 | if (found_key.objectid > ino || |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1116 | found_key.type > BTRFS_EXTENT_DATA_KEY || |
| 1117 | found_key.offset > end) |
| 1118 | break; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1119 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1120 | if (found_key.offset > cur_offset) { |
| 1121 | extent_end = found_key.offset; |
Chris Mason | e9061e2 | 2009-10-09 09:57:45 -0400 | [diff] [blame] | 1122 | extent_type = 0; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1123 | goto out_check; |
| 1124 | } |
Chris Mason | c31f883 | 2008-01-08 15:46:31 -0500 | [diff] [blame] | 1125 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1126 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1127 | struct btrfs_file_extent_item); |
| 1128 | extent_type = btrfs_file_extent_type(leaf, fi); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1129 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1130 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
| 1131 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1132 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1133 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1134 | extent_end = found_key.offset + |
| 1135 | btrfs_file_extent_num_bytes(leaf, fi); |
| 1136 | if (extent_end <= start) { |
| 1137 | path->slots[0]++; |
| 1138 | goto next_slot; |
| 1139 | } |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1140 | if (disk_bytenr == 0) |
| 1141 | goto out_check; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1142 | if (btrfs_file_extent_compression(leaf, fi) || |
| 1143 | btrfs_file_extent_encryption(leaf, fi) || |
| 1144 | btrfs_file_extent_other_encoding(leaf, fi)) |
| 1145 | goto out_check; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1146 | if (extent_type == BTRFS_FILE_EXTENT_REG && !force) |
| 1147 | goto out_check; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 1148 | if (btrfs_extent_readonly(root, disk_bytenr)) |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1149 | goto out_check; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1150 | if (btrfs_cross_ref_exist(trans, root, ino, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1151 | found_key.offset - |
| 1152 | extent_offset, disk_bytenr)) |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1153 | goto out_check; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1154 | disk_bytenr += extent_offset; |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1155 | disk_bytenr += cur_offset - found_key.offset; |
| 1156 | num_bytes = min(end + 1, extent_end) - cur_offset; |
| 1157 | /* |
| 1158 | * force cow if csum exists in the range. |
| 1159 | * this ensure that csum for a given extent are |
| 1160 | * either valid or do not exist. |
| 1161 | */ |
| 1162 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) |
| 1163 | goto out_check; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1164 | nocow = 1; |
| 1165 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
| 1166 | extent_end = found_key.offset + |
| 1167 | btrfs_file_extent_inline_len(leaf, fi); |
| 1168 | extent_end = ALIGN(extent_end, root->sectorsize); |
| 1169 | } else { |
| 1170 | BUG_ON(1); |
| 1171 | } |
| 1172 | out_check: |
| 1173 | if (extent_end <= start) { |
| 1174 | path->slots[0]++; |
| 1175 | goto next_slot; |
| 1176 | } |
| 1177 | if (!nocow) { |
| 1178 | if (cow_start == (u64)-1) |
| 1179 | cow_start = cur_offset; |
| 1180 | cur_offset = extent_end; |
| 1181 | if (cur_offset > end) |
| 1182 | break; |
| 1183 | path->slots[0]++; |
| 1184 | goto next_slot; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1185 | } |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1186 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1187 | btrfs_release_path(path); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1188 | if (cow_start != (u64)-1) { |
| 1189 | ret = cow_file_range(inode, locked_page, cow_start, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1190 | found_key.offset - 1, page_started, |
| 1191 | nr_written, 1); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1192 | BUG_ON(ret); |
| 1193 | cow_start = (u64)-1; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1194 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1195 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1196 | if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
| 1197 | struct extent_map *em; |
| 1198 | struct extent_map_tree *em_tree; |
| 1199 | em_tree = &BTRFS_I(inode)->extent_tree; |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 1200 | em = alloc_extent_map(); |
Tsutomu Itoh | c26a920 | 2011-02-14 00:45:29 +0000 | [diff] [blame] | 1201 | BUG_ON(!em); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1202 | em->start = cur_offset; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 1203 | em->orig_start = em->start; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1204 | em->len = num_bytes; |
| 1205 | em->block_len = num_bytes; |
| 1206 | em->block_start = disk_bytenr; |
| 1207 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
| 1208 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
| 1209 | while (1) { |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 1210 | write_lock(&em_tree->lock); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1211 | ret = add_extent_mapping(em_tree, em); |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 1212 | write_unlock(&em_tree->lock); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1213 | if (ret != -EEXIST) { |
| 1214 | free_extent_map(em); |
| 1215 | break; |
| 1216 | } |
| 1217 | btrfs_drop_extent_cache(inode, em->start, |
| 1218 | em->start + em->len - 1, 0); |
| 1219 | } |
| 1220 | type = BTRFS_ORDERED_PREALLOC; |
| 1221 | } else { |
| 1222 | type = BTRFS_ORDERED_NOCOW; |
| 1223 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1224 | |
| 1225 | ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1226 | num_bytes, num_bytes, type); |
| 1227 | BUG_ON(ret); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1228 | |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 1229 | if (root->root_key.objectid == |
| 1230 | BTRFS_DATA_RELOC_TREE_OBJECTID) { |
| 1231 | ret = btrfs_reloc_clone_csums(inode, cur_offset, |
| 1232 | num_bytes); |
| 1233 | BUG_ON(ret); |
| 1234 | } |
| 1235 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1236 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
Chris Mason | a791e35 | 2009-10-08 11:27:10 -0400 | [diff] [blame] | 1237 | cur_offset, cur_offset + num_bytes - 1, |
| 1238 | locked_page, EXTENT_CLEAR_UNLOCK_PAGE | |
| 1239 | EXTENT_CLEAR_UNLOCK | EXTENT_CLEAR_DELALLOC | |
| 1240 | EXTENT_SET_PRIVATE2); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1241 | cur_offset = extent_end; |
| 1242 | if (cur_offset > end) |
| 1243 | break; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1244 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 1245 | btrfs_release_path(path); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1246 | |
| 1247 | if (cur_offset <= end && cow_start == (u64)-1) |
| 1248 | cow_start = cur_offset; |
| 1249 | if (cow_start != (u64)-1) { |
| 1250 | ret = cow_file_range(inode, locked_page, cow_start, end, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1251 | page_started, nr_written, 1); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1252 | BUG_ON(ret); |
| 1253 | } |
| 1254 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1255 | if (nolock) { |
| 1256 | ret = btrfs_end_transaction_nolock(trans, root); |
| 1257 | BUG_ON(ret); |
| 1258 | } else { |
| 1259 | ret = btrfs_end_transaction(trans, root); |
| 1260 | BUG_ON(ret); |
| 1261 | } |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1262 | btrfs_free_path(path); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1263 | return 0; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1264 | } |
| 1265 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1266 | /* |
| 1267 | * extent_io.c call back to do delayed allocation processing |
| 1268 | */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1269 | static int run_delalloc_range(struct inode *inode, struct page *locked_page, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1270 | u64 start, u64 end, int *page_started, |
| 1271 | unsigned long *nr_written) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1272 | { |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1273 | int ret; |
Chris Mason | 7f366cf | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1274 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1275 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 1276 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1277 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1278 | page_started, 1, nr_written); |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 1279 | else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC) |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1280 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1281 | page_started, 0, nr_written); |
Chris Mason | 1e701a3 | 2010-03-11 09:42:04 -0500 | [diff] [blame] | 1282 | else if (!btrfs_test_opt(root, COMPRESS) && |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 1283 | !(BTRFS_I(inode)->force_compress) && |
| 1284 | !(BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS)) |
Chris Mason | 7f366cf | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1285 | ret = cow_file_range(inode, locked_page, start, end, |
| 1286 | page_started, nr_written, 1); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1287 | else |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1288 | ret = cow_file_range_async(inode, locked_page, start, end, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1289 | page_started, nr_written); |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1290 | return ret; |
| 1291 | } |
| 1292 | |
Jeff Mahoney | 1bf8504 | 2011-07-21 16:56:09 +0000 | [diff] [blame] | 1293 | static void btrfs_split_extent_hook(struct inode *inode, |
| 1294 | struct extent_state *orig, u64 split) |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1295 | { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1296 | /* not delalloc, ignore it */ |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1297 | if (!(orig->state & EXTENT_DELALLOC)) |
Jeff Mahoney | 1bf8504 | 2011-07-21 16:56:09 +0000 | [diff] [blame] | 1298 | return; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1299 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1300 | spin_lock(&BTRFS_I(inode)->lock); |
| 1301 | BTRFS_I(inode)->outstanding_extents++; |
| 1302 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1303 | } |
| 1304 | |
| 1305 | /* |
| 1306 | * extent_io.c merge_extent_hook, used to track merged delayed allocation |
| 1307 | * extents so we can keep track of new extents that are just merged onto old |
| 1308 | * extents, such as when we are doing sequential writes, so we can properly |
| 1309 | * account for the metadata space we'll need. |
| 1310 | */ |
Jeff Mahoney | 1bf8504 | 2011-07-21 16:56:09 +0000 | [diff] [blame] | 1311 | static void btrfs_merge_extent_hook(struct inode *inode, |
| 1312 | struct extent_state *new, |
| 1313 | struct extent_state *other) |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1314 | { |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1315 | /* not delalloc, ignore it */ |
| 1316 | if (!(other->state & EXTENT_DELALLOC)) |
Jeff Mahoney | 1bf8504 | 2011-07-21 16:56:09 +0000 | [diff] [blame] | 1317 | return; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1318 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1319 | spin_lock(&BTRFS_I(inode)->lock); |
| 1320 | BTRFS_I(inode)->outstanding_extents--; |
| 1321 | spin_unlock(&BTRFS_I(inode)->lock); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1322 | } |
| 1323 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1324 | /* |
| 1325 | * extent_io.c set_bit_hook, used to track delayed allocation |
| 1326 | * bytes in this file, and to maintain the list of inodes that |
| 1327 | * have pending delalloc work to be done. |
| 1328 | */ |
Jeff Mahoney | 1bf8504 | 2011-07-21 16:56:09 +0000 | [diff] [blame] | 1329 | static void btrfs_set_bit_hook(struct inode *inode, |
| 1330 | struct extent_state *state, int *bits) |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1331 | { |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1332 | |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1333 | /* |
| 1334 | * set_bit and clear bit hooks normally require _irqsave/restore |
Sergei Trofimovich | 27160b6 | 2011-05-20 20:20:32 +0000 | [diff] [blame] | 1335 | * but in this case, we are only testing for the DELALLOC |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1336 | * bit, which is only set or cleared with irqs on |
| 1337 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1338 | if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1339 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1340 | u64 len = state->end + 1 - state->start; |
Chris Mason | 2cf8572 | 2011-07-26 15:35:09 -0400 | [diff] [blame] | 1341 | bool do_list = !btrfs_is_free_space_inode(root, inode); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1342 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1343 | if (*bits & EXTENT_FIRST_DELALLOC) { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1344 | *bits &= ~EXTENT_FIRST_DELALLOC; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1345 | } else { |
| 1346 | spin_lock(&BTRFS_I(inode)->lock); |
| 1347 | BTRFS_I(inode)->outstanding_extents++; |
| 1348 | spin_unlock(&BTRFS_I(inode)->lock); |
| 1349 | } |
Josef Bacik | 287a0ab | 2010-03-19 18:07:23 +0000 | [diff] [blame] | 1350 | |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1351 | spin_lock(&root->fs_info->delalloc_lock); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1352 | BTRFS_I(inode)->delalloc_bytes += len; |
| 1353 | root->fs_info->delalloc_bytes += len; |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1354 | if (do_list && list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1355 | list_add_tail(&BTRFS_I(inode)->delalloc_inodes, |
| 1356 | &root->fs_info->delalloc_inodes); |
| 1357 | } |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1358 | spin_unlock(&root->fs_info->delalloc_lock); |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1359 | } |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1360 | } |
| 1361 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1362 | /* |
| 1363 | * extent_io.c clear_bit_hook, see set_bit_hook for why |
| 1364 | */ |
Jeff Mahoney | 1bf8504 | 2011-07-21 16:56:09 +0000 | [diff] [blame] | 1365 | static void btrfs_clear_bit_hook(struct inode *inode, |
| 1366 | struct extent_state *state, int *bits) |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1367 | { |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1368 | /* |
| 1369 | * set_bit and clear bit hooks normally require _irqsave/restore |
Sergei Trofimovich | 27160b6 | 2011-05-20 20:20:32 +0000 | [diff] [blame] | 1370 | * but in this case, we are only testing for the DELALLOC |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1371 | * bit, which is only set or cleared with irqs on |
| 1372 | */ |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1373 | if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1374 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1375 | u64 len = state->end + 1 - state->start; |
Chris Mason | 2cf8572 | 2011-07-26 15:35:09 -0400 | [diff] [blame] | 1376 | bool do_list = !btrfs_is_free_space_inode(root, inode); |
Chris Mason | bcbfce8 | 2008-04-22 13:26:47 -0400 | [diff] [blame] | 1377 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1378 | if (*bits & EXTENT_FIRST_DELALLOC) { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1379 | *bits &= ~EXTENT_FIRST_DELALLOC; |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 1380 | } else if (!(*bits & EXTENT_DO_ACCOUNTING)) { |
| 1381 | spin_lock(&BTRFS_I(inode)->lock); |
| 1382 | BTRFS_I(inode)->outstanding_extents--; |
| 1383 | spin_unlock(&BTRFS_I(inode)->lock); |
| 1384 | } |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1385 | |
| 1386 | if (*bits & EXTENT_DO_ACCOUNTING) |
| 1387 | btrfs_delalloc_release_metadata(inode, len); |
| 1388 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1389 | if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID |
| 1390 | && do_list) |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1391 | btrfs_free_reserved_data_space(inode, len); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 1392 | |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1393 | spin_lock(&root->fs_info->delalloc_lock); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1394 | root->fs_info->delalloc_bytes -= len; |
| 1395 | BTRFS_I(inode)->delalloc_bytes -= len; |
| 1396 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1397 | if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 && |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1398 | !list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
| 1399 | list_del_init(&BTRFS_I(inode)->delalloc_inodes); |
| 1400 | } |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1401 | spin_unlock(&root->fs_info->delalloc_lock); |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1402 | } |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1403 | } |
| 1404 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1405 | /* |
| 1406 | * extent_io.c merge_bio_hook, this must check the chunk tree to make sure |
| 1407 | * we don't create bios that span stripes or chunks |
| 1408 | */ |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1409 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1410 | size_t size, struct bio *bio, |
| 1411 | unsigned long bio_flags) |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1412 | { |
| 1413 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; |
| 1414 | struct btrfs_mapping_tree *map_tree; |
Chris Mason | a62b940 | 2008-10-03 16:31:08 -0400 | [diff] [blame] | 1415 | u64 logical = (u64)bio->bi_sector << 9; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1416 | u64 length = 0; |
| 1417 | u64 map_length; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1418 | int ret; |
| 1419 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1420 | if (bio_flags & EXTENT_BIO_COMPRESSED) |
| 1421 | return 0; |
| 1422 | |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 1423 | length = bio->bi_size; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1424 | map_tree = &root->fs_info->mapping_tree; |
| 1425 | map_length = length; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1426 | ret = btrfs_map_block(map_tree, READ, logical, |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1427 | &map_length, NULL, 0); |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1428 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1429 | if (map_length < length + size) |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1430 | return 1; |
Andi Kleen | 411fc6b | 2010-10-29 15:14:31 -0400 | [diff] [blame] | 1431 | return ret; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1432 | } |
| 1433 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1434 | /* |
| 1435 | * in order to insert checksums into the metadata in large chunks, |
| 1436 | * we wait until bio submission time. All the pages in the bio are |
| 1437 | * checksummed and sums are attached onto the ordered extent record. |
| 1438 | * |
| 1439 | * At IO completion time the cums attached on the ordered extent record |
| 1440 | * are inserted into the btree |
| 1441 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1442 | static int __btrfs_submit_bio_start(struct inode *inode, int rw, |
| 1443 | struct bio *bio, int mirror_num, |
Chris Mason | eaf25d9 | 2010-05-25 09:48:28 -0400 | [diff] [blame] | 1444 | unsigned long bio_flags, |
| 1445 | u64 bio_offset) |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1446 | { |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1447 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1448 | int ret = 0; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 1449 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1450 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1451 | BUG_ON(ret); |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 1452 | return 0; |
| 1453 | } |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 1454 | |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 1455 | /* |
| 1456 | * in order to insert checksums into the metadata in large chunks, |
| 1457 | * we wait until bio submission time. All the pages in the bio are |
| 1458 | * checksummed and sums are attached onto the ordered extent record. |
| 1459 | * |
| 1460 | * At IO completion time the cums attached on the ordered extent record |
| 1461 | * are inserted into the btree |
| 1462 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1463 | 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] | 1464 | int mirror_num, unsigned long bio_flags, |
| 1465 | u64 bio_offset) |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 1466 | { |
| 1467 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 1468 | return btrfs_map_bio(root, rw, bio, mirror_num, 1); |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1469 | } |
| 1470 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1471 | /* |
Chris Mason | cad321a | 2008-12-17 14:51:42 -0500 | [diff] [blame] | 1472 | * extent_io.c submission hook. This does the right thing for csum calculation |
| 1473 | * on write, or reading the csums from the tree before a read |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1474 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1475 | 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] | 1476 | int mirror_num, unsigned long bio_flags, |
| 1477 | u64 bio_offset) |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1478 | { |
| 1479 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1480 | int ret = 0; |
Chris Mason | 19b9bdb | 2008-10-30 14:23:13 -0400 | [diff] [blame] | 1481 | int skip_sum; |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1482 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 1483 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
Chris Mason | cad321a | 2008-12-17 14:51:42 -0500 | [diff] [blame] | 1484 | |
Chris Mason | 2cf8572 | 2011-07-26 15:35:09 -0400 | [diff] [blame] | 1485 | if (btrfs_is_free_space_inode(root, inode)) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1486 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 2); |
| 1487 | else |
| 1488 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1489 | BUG_ON(ret); |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1490 | |
Christoph Hellwig | 7b6d91d | 2010-08-07 18:20:39 +0200 | [diff] [blame] | 1491 | if (!(rw & REQ_WRITE)) { |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1492 | if (bio_flags & EXTENT_BIO_COMPRESSED) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1493 | return btrfs_submit_compressed_read(inode, bio, |
| 1494 | mirror_num, bio_flags); |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 1495 | } else if (!skip_sum) { |
| 1496 | ret = btrfs_lookup_bio_sums(root, inode, bio, NULL); |
| 1497 | if (ret) |
| 1498 | return ret; |
| 1499 | } |
Chris Mason | 4d1b5fb | 2008-08-20 09:44:52 -0400 | [diff] [blame] | 1500 | goto mapit; |
Chris Mason | 19b9bdb | 2008-10-30 14:23:13 -0400 | [diff] [blame] | 1501 | } else if (!skip_sum) { |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1502 | /* csum items have already been cloned */ |
| 1503 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
| 1504 | goto mapit; |
Chris Mason | 19b9bdb | 2008-10-30 14:23:13 -0400 | [diff] [blame] | 1505 | /* we're doing a write, do the async checksumming */ |
| 1506 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1507 | inode, rw, bio, mirror_num, |
Chris Mason | eaf25d9 | 2010-05-25 09:48:28 -0400 | [diff] [blame] | 1508 | bio_flags, bio_offset, |
| 1509 | __btrfs_submit_bio_start, |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 1510 | __btrfs_submit_bio_done); |
Chris Mason | 19b9bdb | 2008-10-30 14:23:13 -0400 | [diff] [blame] | 1511 | } |
| 1512 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1513 | mapit: |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 1514 | return btrfs_map_bio(root, rw, bio, mirror_num, 0); |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1515 | } |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 1516 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1517 | /* |
| 1518 | * given a list of ordered sums record them in the inode. This happens |
| 1519 | * at IO completion time based on sums calculated at bio submission time. |
| 1520 | */ |
Chris Mason | ba1da2f | 2008-07-17 12:54:15 -0400 | [diff] [blame] | 1521 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1522 | struct inode *inode, u64 file_offset, |
| 1523 | struct list_head *list) |
| 1524 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1525 | struct btrfs_ordered_sum *sum; |
| 1526 | |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 1527 | list_for_each_entry(sum, list, list) { |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1528 | btrfs_csum_file_blocks(trans, |
| 1529 | BTRFS_I(inode)->root->fs_info->csum_root, sum); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1530 | } |
| 1531 | return 0; |
| 1532 | } |
| 1533 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1534 | int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, |
| 1535 | struct extent_state **cached_state) |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1536 | { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1537 | if ((end & (PAGE_CACHE_SIZE - 1)) == 0) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1538 | WARN_ON(1); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1539 | return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end, |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1540 | cached_state, GFP_NOFS); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1541 | } |
| 1542 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1543 | /* see btrfs_writepage_start_hook for details on why this is required */ |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1544 | struct btrfs_writepage_fixup { |
| 1545 | struct page *page; |
| 1546 | struct btrfs_work work; |
| 1547 | }; |
| 1548 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1549 | static void btrfs_writepage_fixup_worker(struct btrfs_work *work) |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1550 | { |
| 1551 | struct btrfs_writepage_fixup *fixup; |
| 1552 | struct btrfs_ordered_extent *ordered; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1553 | struct extent_state *cached_state = NULL; |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1554 | struct page *page; |
| 1555 | struct inode *inode; |
| 1556 | u64 page_start; |
| 1557 | u64 page_end; |
Jeff Mahoney | 87826df | 2012-02-15 16:23:57 +0100 | [diff] [blame] | 1558 | int ret; |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1559 | |
| 1560 | fixup = container_of(work, struct btrfs_writepage_fixup, work); |
| 1561 | page = fixup->page; |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1562 | again: |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1563 | lock_page(page); |
| 1564 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { |
| 1565 | ClearPageChecked(page); |
| 1566 | goto out_page; |
| 1567 | } |
| 1568 | |
| 1569 | inode = page->mapping->host; |
| 1570 | page_start = page_offset(page); |
| 1571 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; |
| 1572 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1573 | lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end, 0, |
| 1574 | &cached_state, GFP_NOFS); |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1575 | |
| 1576 | /* already ordered? We're done */ |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 1577 | if (PagePrivate2(page)) |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1578 | goto out; |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1579 | |
| 1580 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 1581 | if (ordered) { |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1582 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, |
| 1583 | page_end, &cached_state, GFP_NOFS); |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1584 | unlock_page(page); |
| 1585 | btrfs_start_ordered_extent(inode, ordered, 1); |
Jeff Mahoney | 87826df | 2012-02-15 16:23:57 +0100 | [diff] [blame] | 1586 | btrfs_put_ordered_extent(ordered); |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1587 | goto again; |
| 1588 | } |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1589 | |
Jeff Mahoney | 87826df | 2012-02-15 16:23:57 +0100 | [diff] [blame] | 1590 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
| 1591 | if (ret) { |
| 1592 | mapping_set_error(page->mapping, ret); |
| 1593 | end_extent_writepage(page, ret, page_start, page_end); |
| 1594 | ClearPageChecked(page); |
| 1595 | goto out; |
| 1596 | } |
| 1597 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1598 | btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state); |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1599 | ClearPageChecked(page); |
Jeff Mahoney | 87826df | 2012-02-15 16:23:57 +0100 | [diff] [blame] | 1600 | set_page_dirty(page); |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1601 | out: |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1602 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end, |
| 1603 | &cached_state, GFP_NOFS); |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1604 | out_page: |
| 1605 | unlock_page(page); |
| 1606 | page_cache_release(page); |
Miao Xie | b897abe | 2011-01-26 16:19:22 +0800 | [diff] [blame] | 1607 | kfree(fixup); |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1608 | } |
| 1609 | |
| 1610 | /* |
| 1611 | * There are a few paths in the higher layers of the kernel that directly |
| 1612 | * set the page dirty bit without asking the filesystem if it is a |
| 1613 | * good idea. This causes problems because we want to make sure COW |
| 1614 | * properly happens and the data=ordered rules are followed. |
| 1615 | * |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1616 | * 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] | 1617 | * hasn't been properly setup for IO. We kick off an async process |
| 1618 | * to fix it up. The async helper will wait for ordered extents, set |
| 1619 | * the delalloc bit and make it safe to write the page. |
| 1620 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1621 | 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] | 1622 | { |
| 1623 | struct inode *inode = page->mapping->host; |
| 1624 | struct btrfs_writepage_fixup *fixup; |
| 1625 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1626 | |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 1627 | /* this page is properly in the ordered list */ |
| 1628 | if (TestClearPagePrivate2(page)) |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1629 | return 0; |
| 1630 | |
| 1631 | if (PageChecked(page)) |
| 1632 | return -EAGAIN; |
| 1633 | |
| 1634 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); |
| 1635 | if (!fixup) |
| 1636 | return -EAGAIN; |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 1637 | |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1638 | SetPageChecked(page); |
| 1639 | page_cache_get(page); |
| 1640 | fixup->work.func = btrfs_writepage_fixup_worker; |
| 1641 | fixup->page = page; |
| 1642 | btrfs_queue_worker(&root->fs_info->fixup_workers, &fixup->work); |
Jeff Mahoney | 87826df | 2012-02-15 16:23:57 +0100 | [diff] [blame] | 1643 | return -EBUSY; |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1644 | } |
| 1645 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1646 | static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, |
| 1647 | struct inode *inode, u64 file_pos, |
| 1648 | u64 disk_bytenr, u64 disk_num_bytes, |
| 1649 | u64 num_bytes, u64 ram_bytes, |
| 1650 | u8 compression, u8 encryption, |
| 1651 | u16 other_encoding, int extent_type) |
| 1652 | { |
| 1653 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1654 | struct btrfs_file_extent_item *fi; |
| 1655 | struct btrfs_path *path; |
| 1656 | struct extent_buffer *leaf; |
| 1657 | struct btrfs_key ins; |
| 1658 | u64 hint; |
| 1659 | int ret; |
| 1660 | |
| 1661 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 1662 | if (!path) |
| 1663 | return -ENOMEM; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1664 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 1665 | path->leave_spinning = 1; |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 1666 | |
| 1667 | /* |
| 1668 | * we may be replacing one extent in the tree with another. |
| 1669 | * The new extent is pinned in the extent map, and we don't want |
| 1670 | * to drop it from the cache until it is completely in the btree. |
| 1671 | * |
| 1672 | * So, tell btrfs_drop_extents to leave this extent in the cache. |
| 1673 | * the caller is expected to unpin it and allow it to be merged |
| 1674 | * with the others. |
| 1675 | */ |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1676 | ret = btrfs_drop_extents(trans, inode, file_pos, file_pos + num_bytes, |
| 1677 | &hint, 0); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1678 | BUG_ON(ret); |
| 1679 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1680 | ins.objectid = btrfs_ino(inode); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1681 | ins.offset = file_pos; |
| 1682 | ins.type = BTRFS_EXTENT_DATA_KEY; |
| 1683 | ret = btrfs_insert_empty_item(trans, root, path, &ins, sizeof(*fi)); |
| 1684 | BUG_ON(ret); |
| 1685 | leaf = path->nodes[0]; |
| 1686 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1687 | struct btrfs_file_extent_item); |
| 1688 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
| 1689 | btrfs_set_file_extent_type(leaf, fi, extent_type); |
| 1690 | btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr); |
| 1691 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes); |
| 1692 | btrfs_set_file_extent_offset(leaf, fi, 0); |
| 1693 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); |
| 1694 | btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes); |
| 1695 | btrfs_set_file_extent_compression(leaf, fi, compression); |
| 1696 | btrfs_set_file_extent_encryption(leaf, fi, encryption); |
| 1697 | btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 1698 | |
| 1699 | btrfs_unlock_up_safe(path, 1); |
| 1700 | btrfs_set_lock_blocking(leaf); |
| 1701 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1702 | btrfs_mark_buffer_dirty(leaf); |
| 1703 | |
| 1704 | inode_add_bytes(inode, num_bytes); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1705 | |
| 1706 | ins.objectid = disk_bytenr; |
| 1707 | ins.offset = disk_num_bytes; |
| 1708 | ins.type = BTRFS_EXTENT_ITEM_KEY; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1709 | ret = btrfs_alloc_reserved_file_extent(trans, root, |
| 1710 | root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 1711 | btrfs_ino(inode), file_pos, &ins); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1712 | BUG_ON(ret); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1713 | btrfs_free_path(path); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 1714 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1715 | return 0; |
| 1716 | } |
| 1717 | |
Chris Mason | 5d13a98 | 2009-03-13 11:41:46 -0400 | [diff] [blame] | 1718 | /* |
| 1719 | * helper function for btrfs_finish_ordered_io, this |
| 1720 | * just reads in some of the csum leaves to prime them into ram |
| 1721 | * before we start the transaction. It limits the amount of btree |
| 1722 | * reads required while inside the transaction. |
| 1723 | */ |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1724 | /* as ordered data IO finishes, this gets called so we can finish |
| 1725 | * an ordered extent if the range of bytes in the file it covers are |
| 1726 | * fully written. |
| 1727 | */ |
Chris Mason | 211f90e | 2008-07-18 11:56:15 -0400 | [diff] [blame] | 1728 | static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1729 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1730 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1731 | struct btrfs_trans_handle *trans = NULL; |
Chris Mason | 5d13a98 | 2009-03-13 11:41:46 -0400 | [diff] [blame] | 1732 | struct btrfs_ordered_extent *ordered_extent = NULL; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1733 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1734 | struct extent_state *cached_state = NULL; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1735 | int compress_type = 0; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1736 | int ret; |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 1737 | bool nolock; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1738 | |
Josef Bacik | 5a1a3df | 2010-02-02 20:51:14 +0000 | [diff] [blame] | 1739 | ret = btrfs_dec_test_ordered_pending(inode, &ordered_extent, start, |
| 1740 | end - start + 1); |
Chris Mason | ba1da2f | 2008-07-17 12:54:15 -0400 | [diff] [blame] | 1741 | if (!ret) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1742 | return 0; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1743 | BUG_ON(!ordered_extent); |
Josef Bacik | efd049f | 2010-02-02 20:50:10 +0000 | [diff] [blame] | 1744 | |
Chris Mason | 2cf8572 | 2011-07-26 15:35:09 -0400 | [diff] [blame] | 1745 | nolock = btrfs_is_free_space_inode(root, inode); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1746 | |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 1747 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) { |
| 1748 | BUG_ON(!list_empty(&ordered_extent->list)); |
| 1749 | ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
| 1750 | if (!ret) { |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1751 | if (nolock) |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1752 | trans = btrfs_join_transaction_nolock(root); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1753 | else |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1754 | trans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 1755 | BUG_ON(IS_ERR(trans)); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1756 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 1757 | ret = btrfs_update_inode_fallback(trans, root, inode); |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 1758 | BUG_ON(ret); |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 1759 | } |
| 1760 | goto out; |
| 1761 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1762 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1763 | lock_extent_bits(io_tree, ordered_extent->file_offset, |
| 1764 | ordered_extent->file_offset + ordered_extent->len - 1, |
| 1765 | 0, &cached_state, GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1766 | |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1767 | if (nolock) |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1768 | trans = btrfs_join_transaction_nolock(root); |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1769 | else |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 1770 | trans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 1771 | BUG_ON(IS_ERR(trans)); |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 1772 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 1773 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1774 | if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags)) |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1775 | compress_type = ordered_extent->compress_type; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1776 | if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1777 | BUG_ON(compress_type); |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 1778 | ret = btrfs_mark_extent_written(trans, inode, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1779 | ordered_extent->file_offset, |
| 1780 | ordered_extent->file_offset + |
| 1781 | ordered_extent->len); |
| 1782 | BUG_ON(ret); |
| 1783 | } else { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 1784 | BUG_ON(root == root->fs_info->tree_root); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1785 | ret = insert_reserved_file_extent(trans, inode, |
| 1786 | ordered_extent->file_offset, |
| 1787 | ordered_extent->start, |
| 1788 | ordered_extent->disk_len, |
| 1789 | ordered_extent->len, |
| 1790 | ordered_extent->len, |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 1791 | compress_type, 0, 0, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1792 | BTRFS_FILE_EXTENT_REG); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 1793 | unpin_extent_cache(&BTRFS_I(inode)->extent_tree, |
| 1794 | ordered_extent->file_offset, |
| 1795 | ordered_extent->len); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1796 | BUG_ON(ret); |
| 1797 | } |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 1798 | unlock_extent_cached(io_tree, ordered_extent->file_offset, |
| 1799 | ordered_extent->file_offset + |
| 1800 | ordered_extent->len - 1, &cached_state, GFP_NOFS); |
| 1801 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1802 | add_pending_csums(trans, inode, ordered_extent->file_offset, |
| 1803 | &ordered_extent->list); |
| 1804 | |
Josef Bacik | 1ef30be | 2011-04-05 19:25:36 -0400 | [diff] [blame] | 1805 | ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
Miao Xie | a39f752 | 2011-09-11 10:52:25 -0400 | [diff] [blame] | 1806 | if (!ret || !test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 1807 | ret = btrfs_update_inode_fallback(trans, root, inode); |
Josef Bacik | 1ef30be | 2011-04-05 19:25:36 -0400 | [diff] [blame] | 1808 | BUG_ON(ret); |
| 1809 | } |
| 1810 | ret = 0; |
Yan, Zheng | c216775 | 2009-11-12 09:34:21 +0000 | [diff] [blame] | 1811 | out: |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 1812 | if (root != root->fs_info->tree_root) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1813 | btrfs_delalloc_release_metadata(inode, ordered_extent->len); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 1814 | if (trans) { |
| 1815 | if (nolock) |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1816 | btrfs_end_transaction_nolock(trans, root); |
Josef Bacik | 5b0e95b | 2011-10-06 08:58:24 -0400 | [diff] [blame] | 1817 | else |
Josef Bacik | 0cb59c9 | 2010-07-02 12:14:14 -0400 | [diff] [blame] | 1818 | btrfs_end_transaction(trans, root); |
| 1819 | } |
| 1820 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1821 | /* once for us */ |
| 1822 | btrfs_put_ordered_extent(ordered_extent); |
| 1823 | /* once for the tree */ |
| 1824 | btrfs_put_ordered_extent(ordered_extent); |
| 1825 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1826 | return 0; |
| 1827 | } |
| 1828 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1829 | 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] | 1830 | struct extent_state *state, int uptodate) |
| 1831 | { |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 1832 | trace_btrfs_writepage_end_io_hook(page, start, end, uptodate); |
| 1833 | |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 1834 | ClearPagePrivate2(page); |
Chris Mason | 211f90e | 2008-07-18 11:56:15 -0400 | [diff] [blame] | 1835 | return btrfs_finish_ordered_io(page->mapping->host, start, end); |
| 1836 | } |
| 1837 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1838 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1839 | * 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] | 1840 | * if there's a match, we allow the bio to finish. If not, the code in |
| 1841 | * extent_io.c will try to find good copies for us. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1842 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1843 | static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 1844 | struct extent_state *state) |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1845 | { |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 1846 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1847 | struct inode *inode = page->mapping->host; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1848 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1849 | char *kaddr; |
Chris Mason | aadfeb6 | 2008-01-29 09:10:27 -0500 | [diff] [blame] | 1850 | u64 private = ~(u32)0; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1851 | int ret; |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 1852 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1853 | u32 csum = ~(u32)0; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1854 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1855 | if (PageChecked(page)) { |
| 1856 | ClearPageChecked(page); |
| 1857 | goto good; |
| 1858 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 1859 | |
| 1860 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) |
Jan Schmidt | 08d2f34 | 2011-05-04 16:18:50 +0200 | [diff] [blame] | 1861 | goto good; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1862 | |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1863 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID && |
Chris Mason | 9655d29 | 2009-09-02 15:22:30 -0400 | [diff] [blame] | 1864 | test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) { |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1865 | clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM, |
| 1866 | GFP_NOFS); |
| 1867 | return 0; |
| 1868 | } |
| 1869 | |
Yan | c2e639f | 2008-02-04 08:57:25 -0500 | [diff] [blame] | 1870 | if (state && state->start == start) { |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 1871 | private = state->private; |
| 1872 | ret = 0; |
| 1873 | } else { |
| 1874 | ret = get_state_private(io_tree, start, &private); |
| 1875 | } |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 1876 | kaddr = kmap_atomic(page); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1877 | if (ret) |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1878 | goto zeroit; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1879 | |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 1880 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
| 1881 | btrfs_csum_final(csum, (char *)&csum); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1882 | if (csum != private) |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1883 | goto zeroit; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1884 | |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 1885 | kunmap_atomic(kaddr); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1886 | good: |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1887 | return 0; |
| 1888 | |
| 1889 | zeroit: |
Chris Mason | 945d896 | 2011-05-22 12:33:42 -0400 | [diff] [blame] | 1890 | 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] | 1891 | "private %llu\n", |
| 1892 | (unsigned long long)btrfs_ino(page->mapping->host), |
Chris Mason | 193f284 | 2009-04-27 07:29:05 -0400 | [diff] [blame] | 1893 | (unsigned long long)start, csum, |
| 1894 | (unsigned long long)private); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1895 | memset(kaddr + offset, 1, end - start + 1); |
| 1896 | flush_dcache_page(page); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 1897 | kunmap_atomic(kaddr); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 1898 | if (private == 0) |
| 1899 | return 0; |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1900 | return -EIO; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1901 | } |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1902 | |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 1903 | struct delayed_iput { |
| 1904 | struct list_head list; |
| 1905 | struct inode *inode; |
| 1906 | }; |
| 1907 | |
| 1908 | void btrfs_add_delayed_iput(struct inode *inode) |
| 1909 | { |
| 1910 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; |
| 1911 | struct delayed_iput *delayed; |
| 1912 | |
| 1913 | if (atomic_add_unless(&inode->i_count, -1, 1)) |
| 1914 | return; |
| 1915 | |
| 1916 | delayed = kmalloc(sizeof(*delayed), GFP_NOFS | __GFP_NOFAIL); |
| 1917 | delayed->inode = inode; |
| 1918 | |
| 1919 | spin_lock(&fs_info->delayed_iput_lock); |
| 1920 | list_add_tail(&delayed->list, &fs_info->delayed_iputs); |
| 1921 | spin_unlock(&fs_info->delayed_iput_lock); |
| 1922 | } |
| 1923 | |
| 1924 | void btrfs_run_delayed_iputs(struct btrfs_root *root) |
| 1925 | { |
| 1926 | LIST_HEAD(list); |
| 1927 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 1928 | struct delayed_iput *delayed; |
| 1929 | int empty; |
| 1930 | |
| 1931 | spin_lock(&fs_info->delayed_iput_lock); |
| 1932 | empty = list_empty(&fs_info->delayed_iputs); |
| 1933 | spin_unlock(&fs_info->delayed_iput_lock); |
| 1934 | if (empty) |
| 1935 | return; |
| 1936 | |
| 1937 | down_read(&root->fs_info->cleanup_work_sem); |
| 1938 | spin_lock(&fs_info->delayed_iput_lock); |
| 1939 | list_splice_init(&fs_info->delayed_iputs, &list); |
| 1940 | spin_unlock(&fs_info->delayed_iput_lock); |
| 1941 | |
| 1942 | while (!list_empty(&list)) { |
| 1943 | delayed = list_entry(list.next, struct delayed_iput, list); |
| 1944 | list_del(&delayed->list); |
| 1945 | iput(delayed->inode); |
| 1946 | kfree(delayed); |
| 1947 | } |
| 1948 | up_read(&root->fs_info->cleanup_work_sem); |
| 1949 | } |
| 1950 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1951 | enum btrfs_orphan_cleanup_state { |
| 1952 | ORPHAN_CLEANUP_STARTED = 1, |
| 1953 | ORPHAN_CLEANUP_DONE = 2, |
| 1954 | }; |
| 1955 | |
| 1956 | /* |
Justin P. Mattock | 42b2aa8 | 2011-11-28 20:31:00 -0800 | [diff] [blame] | 1957 | * This is called in transaction commit time. If there are no orphan |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1958 | * files in the subvolume, it removes orphan item and frees block_rsv |
| 1959 | * structure. |
| 1960 | */ |
| 1961 | void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, |
| 1962 | struct btrfs_root *root) |
| 1963 | { |
Josef Bacik | 90290e1 | 2011-12-02 15:44:12 -0500 | [diff] [blame] | 1964 | struct btrfs_block_rsv *block_rsv; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1965 | int ret; |
| 1966 | |
| 1967 | if (!list_empty(&root->orphan_list) || |
| 1968 | root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) |
| 1969 | return; |
| 1970 | |
Josef Bacik | 90290e1 | 2011-12-02 15:44:12 -0500 | [diff] [blame] | 1971 | spin_lock(&root->orphan_lock); |
| 1972 | if (!list_empty(&root->orphan_list)) { |
| 1973 | spin_unlock(&root->orphan_lock); |
| 1974 | return; |
| 1975 | } |
| 1976 | |
| 1977 | if (root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) { |
| 1978 | spin_unlock(&root->orphan_lock); |
| 1979 | return; |
| 1980 | } |
| 1981 | |
| 1982 | block_rsv = root->orphan_block_rsv; |
| 1983 | root->orphan_block_rsv = NULL; |
| 1984 | spin_unlock(&root->orphan_lock); |
| 1985 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1986 | if (root->orphan_item_inserted && |
| 1987 | btrfs_root_refs(&root->root_item) > 0) { |
| 1988 | ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root, |
| 1989 | root->root_key.objectid); |
| 1990 | BUG_ON(ret); |
| 1991 | root->orphan_item_inserted = 0; |
| 1992 | } |
| 1993 | |
Josef Bacik | 90290e1 | 2011-12-02 15:44:12 -0500 | [diff] [blame] | 1994 | if (block_rsv) { |
| 1995 | WARN_ON(block_rsv->size > 0); |
| 1996 | btrfs_free_block_rsv(root, block_rsv); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 1997 | } |
| 1998 | } |
| 1999 | |
| 2000 | /* |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2001 | * This creates an orphan entry for the given inode in case something goes |
| 2002 | * wrong in the middle of an unlink/truncate. |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2003 | * |
| 2004 | * NOTE: caller of this function should reserve 5 units of metadata for |
| 2005 | * this function. |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2006 | */ |
| 2007 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) |
| 2008 | { |
| 2009 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2010 | struct btrfs_block_rsv *block_rsv = NULL; |
| 2011 | int reserve = 0; |
| 2012 | int insert = 0; |
| 2013 | int ret; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2014 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2015 | if (!root->orphan_block_rsv) { |
| 2016 | block_rsv = btrfs_alloc_block_rsv(root); |
Tsutomu Itoh | b532402 | 2011-07-19 07:27:20 +0000 | [diff] [blame] | 2017 | if (!block_rsv) |
| 2018 | return -ENOMEM; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2019 | } |
| 2020 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2021 | spin_lock(&root->orphan_lock); |
| 2022 | if (!root->orphan_block_rsv) { |
| 2023 | root->orphan_block_rsv = block_rsv; |
| 2024 | } else if (block_rsv) { |
| 2025 | btrfs_free_block_rsv(root, block_rsv); |
| 2026 | block_rsv = NULL; |
| 2027 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2028 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2029 | if (list_empty(&BTRFS_I(inode)->i_orphan)) { |
| 2030 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); |
| 2031 | #if 0 |
| 2032 | /* |
| 2033 | * For proper ENOSPC handling, we should do orphan |
| 2034 | * cleanup when mounting. But this introduces backward |
| 2035 | * compatibility issue. |
| 2036 | */ |
| 2037 | if (!xchg(&root->orphan_item_inserted, 1)) |
| 2038 | insert = 2; |
| 2039 | else |
| 2040 | insert = 1; |
| 2041 | #endif |
| 2042 | insert = 1; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2043 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2044 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2045 | if (!BTRFS_I(inode)->orphan_meta_reserved) { |
| 2046 | BTRFS_I(inode)->orphan_meta_reserved = 1; |
| 2047 | reserve = 1; |
| 2048 | } |
| 2049 | spin_unlock(&root->orphan_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2050 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2051 | /* grab metadata reservation from transaction handle */ |
| 2052 | if (reserve) { |
| 2053 | ret = btrfs_orphan_reserve_metadata(trans, inode); |
| 2054 | BUG_ON(ret); |
| 2055 | } |
| 2056 | |
| 2057 | /* insert an orphan item to track this unlinked/truncated file */ |
| 2058 | if (insert >= 1) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2059 | ret = btrfs_insert_orphan_item(trans, root, btrfs_ino(inode)); |
Josef Bacik | ee4d89f | 2011-12-13 12:55:58 -0500 | [diff] [blame] | 2060 | BUG_ON(ret && ret != -EEXIST); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2061 | } |
| 2062 | |
| 2063 | /* insert an orphan item to track subvolume contains orphan files */ |
| 2064 | if (insert >= 2) { |
| 2065 | ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root, |
| 2066 | root->root_key.objectid); |
| 2067 | BUG_ON(ret); |
| 2068 | } |
| 2069 | return 0; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2070 | } |
| 2071 | |
| 2072 | /* |
| 2073 | * We have done the truncate/delete so we can go ahead and remove the orphan |
| 2074 | * item for this particular inode. |
| 2075 | */ |
| 2076 | int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) |
| 2077 | { |
| 2078 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2079 | int delete_item = 0; |
| 2080 | int release_rsv = 0; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2081 | int ret = 0; |
| 2082 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2083 | spin_lock(&root->orphan_lock); |
| 2084 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { |
| 2085 | list_del_init(&BTRFS_I(inode)->i_orphan); |
| 2086 | delete_item = 1; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2087 | } |
| 2088 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2089 | if (BTRFS_I(inode)->orphan_meta_reserved) { |
| 2090 | BTRFS_I(inode)->orphan_meta_reserved = 0; |
| 2091 | release_rsv = 1; |
| 2092 | } |
| 2093 | spin_unlock(&root->orphan_lock); |
| 2094 | |
| 2095 | if (trans && delete_item) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2096 | ret = btrfs_del_orphan_item(trans, root, btrfs_ino(inode)); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2097 | BUG_ON(ret); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2098 | } |
| 2099 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2100 | if (release_rsv) |
| 2101 | btrfs_orphan_release_metadata(inode); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2102 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2103 | return 0; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2104 | } |
| 2105 | |
| 2106 | /* |
| 2107 | * this cleans up any orphans that may be left on the list from the last use |
| 2108 | * of this root. |
| 2109 | */ |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2110 | int btrfs_orphan_cleanup(struct btrfs_root *root) |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2111 | { |
| 2112 | struct btrfs_path *path; |
| 2113 | struct extent_buffer *leaf; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2114 | struct btrfs_key key, found_key; |
| 2115 | struct btrfs_trans_handle *trans; |
| 2116 | struct inode *inode; |
Josef Bacik | 8f6d7f4 | 2011-09-26 15:55:20 -0400 | [diff] [blame] | 2117 | u64 last_objectid = 0; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2118 | int ret = 0, nr_unlink = 0, nr_truncate = 0; |
| 2119 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2120 | if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED)) |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2121 | return 0; |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 2122 | |
| 2123 | path = btrfs_alloc_path(); |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2124 | if (!path) { |
| 2125 | ret = -ENOMEM; |
| 2126 | goto out; |
| 2127 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2128 | path->reada = -1; |
| 2129 | |
| 2130 | key.objectid = BTRFS_ORPHAN_OBJECTID; |
| 2131 | btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); |
| 2132 | key.offset = (u64)-1; |
| 2133 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2134 | while (1) { |
| 2135 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2136 | if (ret < 0) |
| 2137 | goto out; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2138 | |
| 2139 | /* |
| 2140 | * 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] | 2141 | * 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] | 2142 | * find the key and see if we have stuff that matches |
| 2143 | */ |
| 2144 | if (ret > 0) { |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2145 | ret = 0; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2146 | if (path->slots[0] == 0) |
| 2147 | break; |
| 2148 | path->slots[0]--; |
| 2149 | } |
| 2150 | |
| 2151 | /* pull out the item */ |
| 2152 | leaf = path->nodes[0]; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2153 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 2154 | |
| 2155 | /* make sure the item matches what we want */ |
| 2156 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) |
| 2157 | break; |
| 2158 | if (btrfs_key_type(&found_key) != BTRFS_ORPHAN_ITEM_KEY) |
| 2159 | break; |
| 2160 | |
| 2161 | /* release the path since we're done with it */ |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2162 | btrfs_release_path(path); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2163 | |
| 2164 | /* |
| 2165 | * this is where we are basically btrfs_lookup, without the |
| 2166 | * crossing root thing. we store the inode number in the |
| 2167 | * offset of the orphan item. |
| 2168 | */ |
Josef Bacik | 8f6d7f4 | 2011-09-26 15:55:20 -0400 | [diff] [blame] | 2169 | |
| 2170 | if (found_key.offset == last_objectid) { |
| 2171 | printk(KERN_ERR "btrfs: Error removing orphan entry, " |
| 2172 | "stopping orphan cleanup\n"); |
| 2173 | ret = -EINVAL; |
| 2174 | goto out; |
| 2175 | } |
| 2176 | |
| 2177 | last_objectid = found_key.offset; |
| 2178 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2179 | found_key.objectid = found_key.offset; |
| 2180 | found_key.type = BTRFS_INODE_ITEM_KEY; |
| 2181 | found_key.offset = 0; |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 2182 | inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL); |
Josef Bacik | a8c9e57 | 2011-09-21 16:55:59 -0400 | [diff] [blame] | 2183 | ret = PTR_RET(inode); |
| 2184 | if (ret && ret != -ESTALE) |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2185 | goto out; |
Josef Bacik | a8c9e57 | 2011-09-21 16:55:59 -0400 | [diff] [blame] | 2186 | |
Arne Jansen | f8e9e0b | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 2187 | if (ret == -ESTALE && root == root->fs_info->tree_root) { |
| 2188 | struct btrfs_root *dead_root; |
| 2189 | struct btrfs_fs_info *fs_info = root->fs_info; |
| 2190 | int is_dead_root = 0; |
| 2191 | |
| 2192 | /* |
| 2193 | * this is an orphan in the tree root. Currently these |
| 2194 | * could come from 2 sources: |
| 2195 | * a) a snapshot deletion in progress |
| 2196 | * b) a free space cache inode |
| 2197 | * We need to distinguish those two, as the snapshot |
| 2198 | * orphan must not get deleted. |
| 2199 | * find_dead_roots already ran before us, so if this |
| 2200 | * is a snapshot deletion, we should find the root |
| 2201 | * in the dead_roots list |
| 2202 | */ |
| 2203 | spin_lock(&fs_info->trans_lock); |
| 2204 | list_for_each_entry(dead_root, &fs_info->dead_roots, |
| 2205 | root_list) { |
| 2206 | if (dead_root->root_key.objectid == |
| 2207 | found_key.objectid) { |
| 2208 | is_dead_root = 1; |
| 2209 | break; |
| 2210 | } |
| 2211 | } |
| 2212 | spin_unlock(&fs_info->trans_lock); |
| 2213 | if (is_dead_root) { |
| 2214 | /* prevent this orphan from being found again */ |
| 2215 | key.offset = found_key.objectid - 1; |
| 2216 | continue; |
| 2217 | } |
| 2218 | } |
Josef Bacik | a8c9e57 | 2011-09-21 16:55:59 -0400 | [diff] [blame] | 2219 | /* |
| 2220 | * Inode is already gone but the orphan item is still there, |
| 2221 | * kill the orphan item. |
| 2222 | */ |
| 2223 | if (ret == -ESTALE) { |
| 2224 | trans = btrfs_start_transaction(root, 1); |
| 2225 | if (IS_ERR(trans)) { |
| 2226 | ret = PTR_ERR(trans); |
| 2227 | goto out; |
| 2228 | } |
| 2229 | ret = btrfs_del_orphan_item(trans, root, |
| 2230 | found_key.objectid); |
| 2231 | BUG_ON(ret); |
| 2232 | btrfs_end_transaction(trans, root); |
| 2233 | continue; |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2234 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2235 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2236 | /* |
| 2237 | * add this inode to the orphan list so btrfs_orphan_del does |
| 2238 | * the proper thing when we hit it |
| 2239 | */ |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2240 | spin_lock(&root->orphan_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2241 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2242 | spin_unlock(&root->orphan_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2243 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2244 | /* if we have links, this was a truncate, lets do that */ |
| 2245 | if (inode->i_nlink) { |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 2246 | if (!S_ISREG(inode->i_mode)) { |
| 2247 | WARN_ON(1); |
| 2248 | iput(inode); |
| 2249 | continue; |
| 2250 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2251 | nr_truncate++; |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2252 | ret = btrfs_truncate(inode); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2253 | } else { |
| 2254 | nr_unlink++; |
| 2255 | } |
| 2256 | |
| 2257 | /* this will do delete_inode and everything for us */ |
| 2258 | iput(inode); |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2259 | if (ret) |
| 2260 | goto out; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2261 | } |
Miao Xie | 3254c87 | 2011-11-10 20:45:05 -0500 | [diff] [blame] | 2262 | /* release the path since we're done with it */ |
| 2263 | btrfs_release_path(path); |
| 2264 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2265 | root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE; |
| 2266 | |
| 2267 | if (root->orphan_block_rsv) |
| 2268 | btrfs_block_rsv_release(root, root->orphan_block_rsv, |
| 2269 | (u64)-1); |
| 2270 | |
| 2271 | if (root->orphan_block_rsv || root->orphan_item_inserted) { |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 2272 | trans = btrfs_join_transaction(root); |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2273 | if (!IS_ERR(trans)) |
| 2274 | btrfs_end_transaction(trans, root); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 2275 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2276 | |
| 2277 | if (nr_unlink) |
| 2278 | printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink); |
| 2279 | if (nr_truncate) |
| 2280 | printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate); |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 2281 | |
| 2282 | out: |
| 2283 | if (ret) |
| 2284 | printk(KERN_CRIT "btrfs: could not do orphan cleanup %d\n", ret); |
| 2285 | btrfs_free_path(path); |
| 2286 | return ret; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2287 | } |
| 2288 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2289 | /* |
Chris Mason | 46a53cc | 2009-04-27 11:47:50 -0400 | [diff] [blame] | 2290 | * very simple check to peek ahead in the leaf looking for xattrs. If we |
| 2291 | * don't find any xattrs, we know there can't be any acls. |
| 2292 | * |
| 2293 | * slot is the slot the inode is in, objectid is the objectid of the inode |
| 2294 | */ |
| 2295 | static noinline int acls_after_inode_item(struct extent_buffer *leaf, |
| 2296 | int slot, u64 objectid) |
| 2297 | { |
| 2298 | u32 nritems = btrfs_header_nritems(leaf); |
| 2299 | struct btrfs_key found_key; |
| 2300 | int scanned = 0; |
| 2301 | |
| 2302 | slot++; |
| 2303 | while (slot < nritems) { |
| 2304 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 2305 | |
| 2306 | /* we found a different objectid, there must not be acls */ |
| 2307 | if (found_key.objectid != objectid) |
| 2308 | return 0; |
| 2309 | |
| 2310 | /* we found an xattr, assume we've got an acl */ |
| 2311 | if (found_key.type == BTRFS_XATTR_ITEM_KEY) |
| 2312 | return 1; |
| 2313 | |
| 2314 | /* |
| 2315 | * we found a key greater than an xattr key, there can't |
| 2316 | * be any acls later on |
| 2317 | */ |
| 2318 | if (found_key.type > BTRFS_XATTR_ITEM_KEY) |
| 2319 | return 0; |
| 2320 | |
| 2321 | slot++; |
| 2322 | scanned++; |
| 2323 | |
| 2324 | /* |
| 2325 | * it goes inode, inode backrefs, xattrs, extents, |
| 2326 | * so if there are a ton of hard links to an inode there can |
| 2327 | * be a lot of backrefs. Don't waste time searching too hard, |
| 2328 | * this is just an optimization |
| 2329 | */ |
| 2330 | if (scanned >= 8) |
| 2331 | break; |
| 2332 | } |
| 2333 | /* we hit the end of the leaf before we found an xattr or |
| 2334 | * something larger than an xattr. We have to assume the inode |
| 2335 | * has acls |
| 2336 | */ |
| 2337 | return 1; |
| 2338 | } |
| 2339 | |
| 2340 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2341 | * read an inode from the btree into the in-memory inode |
| 2342 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2343 | static void btrfs_read_locked_inode(struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2344 | { |
| 2345 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2346 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2347 | struct btrfs_inode_item *inode_item; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2348 | struct btrfs_timespec *tspec; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2349 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2350 | struct btrfs_key location; |
Chris Mason | 46a53cc | 2009-04-27 11:47:50 -0400 | [diff] [blame] | 2351 | int maybe_acls; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 2352 | u32 rdev; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2353 | int ret; |
Miao Xie | 2f7e33d | 2011-06-23 07:27:13 +0000 | [diff] [blame] | 2354 | bool filled = false; |
| 2355 | |
| 2356 | ret = btrfs_fill_inode(inode, &rdev); |
| 2357 | if (!ret) |
| 2358 | filled = true; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2359 | |
| 2360 | path = btrfs_alloc_path(); |
Mark Fasheh | 1748f84 | 2011-07-12 11:25:31 -0700 | [diff] [blame] | 2361 | if (!path) |
| 2362 | goto make_bad; |
| 2363 | |
Josef Bacik | d90c732 | 2011-05-17 09:50:54 -0400 | [diff] [blame] | 2364 | path->leave_spinning = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2365 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 2366 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2367 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2368 | if (ret) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2369 | goto make_bad; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2370 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2371 | leaf = path->nodes[0]; |
Miao Xie | 2f7e33d | 2011-06-23 07:27:13 +0000 | [diff] [blame] | 2372 | |
| 2373 | if (filled) |
| 2374 | goto cache_acl; |
| 2375 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2376 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
| 2377 | struct btrfs_inode_item); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2378 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 2379 | set_nlink(inode, btrfs_inode_nlink(leaf, inode_item)); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2380 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); |
| 2381 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 2382 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2383 | |
| 2384 | tspec = btrfs_inode_atime(inode_item); |
| 2385 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); |
| 2386 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); |
| 2387 | |
| 2388 | tspec = btrfs_inode_mtime(inode_item); |
| 2389 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); |
| 2390 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); |
| 2391 | |
| 2392 | tspec = btrfs_inode_ctime(inode_item); |
| 2393 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); |
| 2394 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); |
| 2395 | |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 2396 | inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item)); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2397 | BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item); |
Chris Mason | c3027eb | 2008-12-08 16:40:21 -0500 | [diff] [blame] | 2398 | BTRFS_I(inode)->sequence = btrfs_inode_sequence(leaf, inode_item); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2399 | inode->i_generation = BTRFS_I(inode)->generation; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 2400 | inode->i_rdev = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2401 | rdev = btrfs_inode_rdev(leaf, inode_item); |
| 2402 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2403 | BTRFS_I(inode)->index_cnt = (u64)-1; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2404 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
Miao Xie | 2f7e33d | 2011-06-23 07:27:13 +0000 | [diff] [blame] | 2405 | cache_acl: |
Chris Mason | 46a53cc | 2009-04-27 11:47:50 -0400 | [diff] [blame] | 2406 | /* |
| 2407 | * try to precache a NULL acl entry for files that don't have |
| 2408 | * any xattrs or acls |
| 2409 | */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2410 | maybe_acls = acls_after_inode_item(leaf, path->slots[0], |
| 2411 | btrfs_ino(inode)); |
Al Viro | 72c0490 | 2009-06-24 16:58:48 -0400 | [diff] [blame] | 2412 | if (!maybe_acls) |
| 2413 | cache_no_acl(inode); |
Chris Mason | 46a53cc | 2009-04-27 11:47:50 -0400 | [diff] [blame] | 2414 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2415 | btrfs_free_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2416 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2417 | switch (inode->i_mode & S_IFMT) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2418 | case S_IFREG: |
| 2419 | inode->i_mapping->a_ops = &btrfs_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 2420 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2421 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2422 | inode->i_fop = &btrfs_file_operations; |
| 2423 | inode->i_op = &btrfs_file_inode_operations; |
| 2424 | break; |
| 2425 | case S_IFDIR: |
| 2426 | inode->i_fop = &btrfs_dir_file_operations; |
| 2427 | if (root == root->fs_info->tree_root) |
| 2428 | inode->i_op = &btrfs_dir_ro_inode_operations; |
| 2429 | else |
| 2430 | inode->i_op = &btrfs_dir_inode_operations; |
| 2431 | break; |
| 2432 | case S_IFLNK: |
| 2433 | inode->i_op = &btrfs_symlink_inode_operations; |
| 2434 | inode->i_mapping->a_ops = &btrfs_symlink_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 2435 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2436 | break; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 2437 | default: |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 2438 | inode->i_op = &btrfs_special_inode_operations; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 2439 | init_special_inode(inode, inode->i_mode, rdev); |
| 2440 | break; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2441 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 2442 | |
| 2443 | btrfs_update_iflags(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2444 | return; |
| 2445 | |
| 2446 | make_bad: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2447 | btrfs_free_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2448 | make_bad_inode(inode); |
| 2449 | } |
| 2450 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2451 | /* |
| 2452 | * given a leaf and an inode, copy the inode fields into the leaf |
| 2453 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2454 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
| 2455 | struct extent_buffer *leaf, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2456 | struct btrfs_inode_item *item, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2457 | struct inode *inode) |
| 2458 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2459 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
| 2460 | btrfs_set_inode_gid(leaf, item, inode->i_gid); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 2461 | btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2462 | btrfs_set_inode_mode(leaf, item, inode->i_mode); |
| 2463 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); |
| 2464 | |
| 2465 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), |
| 2466 | inode->i_atime.tv_sec); |
| 2467 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), |
| 2468 | inode->i_atime.tv_nsec); |
| 2469 | |
| 2470 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), |
| 2471 | inode->i_mtime.tv_sec); |
| 2472 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), |
| 2473 | inode->i_mtime.tv_nsec); |
| 2474 | |
| 2475 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), |
| 2476 | inode->i_ctime.tv_sec); |
| 2477 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), |
| 2478 | inode->i_ctime.tv_nsec); |
| 2479 | |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 2480 | btrfs_set_inode_nbytes(leaf, item, inode_get_bytes(inode)); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2481 | btrfs_set_inode_generation(leaf, item, BTRFS_I(inode)->generation); |
Chris Mason | c3027eb | 2008-12-08 16:40:21 -0500 | [diff] [blame] | 2482 | btrfs_set_inode_sequence(leaf, item, BTRFS_I(inode)->sequence); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2483 | btrfs_set_inode_transid(leaf, item, trans->transid); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2484 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); |
Yan | b98b676 | 2008-01-08 15:54:37 -0500 | [diff] [blame] | 2485 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 2486 | btrfs_set_inode_block_group(leaf, item, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2487 | } |
| 2488 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2489 | /* |
| 2490 | * copy everything in the in-memory inode into the btree. |
| 2491 | */ |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 2492 | static noinline int btrfs_update_inode_item(struct btrfs_trans_handle *trans, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2493 | struct btrfs_root *root, struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2494 | { |
| 2495 | struct btrfs_inode_item *inode_item; |
| 2496 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2497 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2498 | int ret; |
| 2499 | |
| 2500 | path = btrfs_alloc_path(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2501 | if (!path) |
| 2502 | return -ENOMEM; |
| 2503 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2504 | path->leave_spinning = 1; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2505 | ret = btrfs_lookup_inode(trans, root, path, &BTRFS_I(inode)->location, |
| 2506 | 1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2507 | if (ret) { |
| 2508 | if (ret > 0) |
| 2509 | ret = -ENOENT; |
| 2510 | goto failed; |
| 2511 | } |
| 2512 | |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 2513 | btrfs_unlock_up_safe(path, 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2514 | leaf = path->nodes[0]; |
| 2515 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2516 | struct btrfs_inode_item); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2517 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2518 | fill_inode_item(trans, leaf, inode_item, inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2519 | btrfs_mark_buffer_dirty(leaf); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 2520 | btrfs_set_inode_last_trans(trans, inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2521 | ret = 0; |
| 2522 | failed: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2523 | btrfs_free_path(path); |
| 2524 | return ret; |
| 2525 | } |
| 2526 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2527 | /* |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 2528 | * copy everything in the in-memory inode into the btree. |
| 2529 | */ |
| 2530 | noinline int btrfs_update_inode(struct btrfs_trans_handle *trans, |
| 2531 | struct btrfs_root *root, struct inode *inode) |
| 2532 | { |
| 2533 | int ret; |
| 2534 | |
| 2535 | /* |
| 2536 | * If the inode is a free space inode, we can deadlock during commit |
| 2537 | * if we put it into the delayed code. |
| 2538 | * |
| 2539 | * The data relocation inode should also be directly updated |
| 2540 | * without delay |
| 2541 | */ |
| 2542 | if (!btrfs_is_free_space_inode(root, inode) |
| 2543 | && root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID) { |
| 2544 | ret = btrfs_delayed_update_inode(trans, root, inode); |
| 2545 | if (!ret) |
| 2546 | btrfs_set_inode_last_trans(trans, inode); |
| 2547 | return ret; |
| 2548 | } |
| 2549 | |
| 2550 | return btrfs_update_inode_item(trans, root, inode); |
| 2551 | } |
| 2552 | |
| 2553 | static noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, |
| 2554 | struct btrfs_root *root, struct inode *inode) |
| 2555 | { |
| 2556 | int ret; |
| 2557 | |
| 2558 | ret = btrfs_update_inode(trans, root, inode); |
| 2559 | if (ret == -ENOSPC) |
| 2560 | return btrfs_update_inode_item(trans, root, inode); |
| 2561 | return ret; |
| 2562 | } |
| 2563 | |
| 2564 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2565 | * unlink helper that gets used here in inode.c and in the tree logging |
| 2566 | * recovery code. It remove a link in a directory with a given name, and |
| 2567 | * also drops the back refs in the inode to the directory |
| 2568 | */ |
Al Viro | 9298679 | 2011-03-04 17:14:37 +0000 | [diff] [blame] | 2569 | static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
| 2570 | struct btrfs_root *root, |
| 2571 | struct inode *dir, struct inode *inode, |
| 2572 | const char *name, int name_len) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2573 | { |
| 2574 | struct btrfs_path *path; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2575 | int ret = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2576 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2577 | struct btrfs_dir_item *di; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2578 | struct btrfs_key key; |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2579 | u64 index; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2580 | u64 ino = btrfs_ino(inode); |
| 2581 | u64 dir_ino = btrfs_ino(dir); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2582 | |
| 2583 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2584 | if (!path) { |
| 2585 | ret = -ENOMEM; |
Tsutomu Itoh | 554233a | 2011-02-03 03:16:25 +0000 | [diff] [blame] | 2586 | goto out; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2587 | } |
| 2588 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2589 | path->leave_spinning = 1; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2590 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2591 | name, name_len, -1); |
| 2592 | if (IS_ERR(di)) { |
| 2593 | ret = PTR_ERR(di); |
| 2594 | goto err; |
| 2595 | } |
| 2596 | if (!di) { |
| 2597 | ret = -ENOENT; |
| 2598 | goto err; |
| 2599 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2600 | leaf = path->nodes[0]; |
| 2601 | btrfs_dir_item_key_to_cpu(leaf, di, &key); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2602 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2603 | if (ret) |
| 2604 | goto err; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2605 | btrfs_release_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2606 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2607 | ret = btrfs_del_inode_ref(trans, root, name, name_len, ino, |
| 2608 | dir_ino, &index); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2609 | if (ret) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2610 | printk(KERN_INFO "btrfs failed to delete reference to %.*s, " |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2611 | "inode %llu parent %llu\n", name_len, name, |
| 2612 | (unsigned long long)ino, (unsigned long long)dir_ino); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2613 | goto err; |
| 2614 | } |
| 2615 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2616 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
| 2617 | if (ret) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2618 | goto err; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2619 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2620 | ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2621 | inode, dir_ino); |
Chris Mason | 49eb7e4 | 2008-09-11 15:53:12 -0400 | [diff] [blame] | 2622 | BUG_ON(ret != 0 && ret != -ENOENT); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2623 | |
| 2624 | ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, |
| 2625 | dir, index); |
Chris Mason | 6418c96 | 2010-10-30 07:34:24 -0400 | [diff] [blame] | 2626 | if (ret == -ENOENT) |
| 2627 | ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2628 | err: |
| 2629 | btrfs_free_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2630 | if (ret) |
| 2631 | goto out; |
| 2632 | |
| 2633 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); |
| 2634 | inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
| 2635 | btrfs_update_inode(trans, root, dir); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2636 | out: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2637 | return ret; |
| 2638 | } |
| 2639 | |
Al Viro | 9298679 | 2011-03-04 17:14:37 +0000 | [diff] [blame] | 2640 | int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
| 2641 | struct btrfs_root *root, |
| 2642 | struct inode *dir, struct inode *inode, |
| 2643 | const char *name, int name_len) |
| 2644 | { |
| 2645 | int ret; |
| 2646 | ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len); |
| 2647 | if (!ret) { |
| 2648 | btrfs_drop_nlink(inode); |
| 2649 | ret = btrfs_update_inode(trans, root, inode); |
| 2650 | } |
| 2651 | return ret; |
| 2652 | } |
| 2653 | |
| 2654 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2655 | /* helper to check if there is any shared block in the path */ |
| 2656 | static int check_path_shared(struct btrfs_root *root, |
| 2657 | struct btrfs_path *path) |
| 2658 | { |
| 2659 | struct extent_buffer *eb; |
| 2660 | int level; |
Dan Carpenter | 0e4dcbe | 2010-06-01 08:23:11 +0000 | [diff] [blame] | 2661 | u64 refs = 1; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2662 | |
| 2663 | for (level = 0; level < BTRFS_MAX_LEVEL; level++) { |
Josef Bacik | dedefd7 | 2011-01-24 21:43:18 +0000 | [diff] [blame] | 2664 | int ret; |
| 2665 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2666 | if (!path->nodes[level]) |
| 2667 | break; |
| 2668 | eb = path->nodes[level]; |
| 2669 | if (!btrfs_block_can_be_shared(root, eb)) |
| 2670 | continue; |
| 2671 | ret = btrfs_lookup_extent_info(NULL, root, eb->start, eb->len, |
| 2672 | &refs, NULL); |
| 2673 | if (refs > 1) |
| 2674 | return 1; |
| 2675 | } |
Josef Bacik | dedefd7 | 2011-01-24 21:43:18 +0000 | [diff] [blame] | 2676 | return 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2677 | } |
| 2678 | |
| 2679 | /* |
| 2680 | * helper to start transaction for unlink and rmdir. |
| 2681 | * |
| 2682 | * unlink and rmdir are special in btrfs, they do not always free space. |
| 2683 | * so in enospc case, we should make sure they will free space before |
| 2684 | * allowing them to use the global metadata reservation. |
| 2685 | */ |
| 2686 | static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir, |
| 2687 | struct dentry *dentry) |
| 2688 | { |
| 2689 | struct btrfs_trans_handle *trans; |
| 2690 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 2691 | struct btrfs_path *path; |
| 2692 | struct btrfs_inode_ref *ref; |
| 2693 | struct btrfs_dir_item *di; |
| 2694 | struct inode *inode = dentry->d_inode; |
| 2695 | u64 index; |
| 2696 | int check_link = 1; |
| 2697 | int err = -ENOSPC; |
| 2698 | int ret; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2699 | u64 ino = btrfs_ino(inode); |
| 2700 | u64 dir_ino = btrfs_ino(dir); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2701 | |
Josef Bacik | e70bea5 | 2011-10-11 14:18:24 -0400 | [diff] [blame] | 2702 | /* |
| 2703 | * 1 for the possible orphan item |
| 2704 | * 1 for the dir item |
| 2705 | * 1 for the dir index |
| 2706 | * 1 for the inode ref |
| 2707 | * 1 for the inode ref in the tree log |
| 2708 | * 2 for the dir entries in the log |
| 2709 | * 1 for the inode |
| 2710 | */ |
| 2711 | trans = btrfs_start_transaction(root, 8); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2712 | if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC) |
| 2713 | return trans; |
| 2714 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2715 | if (ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2716 | return ERR_PTR(-ENOSPC); |
| 2717 | |
| 2718 | /* check if there is someone else holds reference */ |
| 2719 | if (S_ISDIR(inode->i_mode) && atomic_read(&inode->i_count) > 1) |
| 2720 | return ERR_PTR(-ENOSPC); |
| 2721 | |
| 2722 | if (atomic_read(&inode->i_count) > 2) |
| 2723 | return ERR_PTR(-ENOSPC); |
| 2724 | |
| 2725 | if (xchg(&root->fs_info->enospc_unlink, 1)) |
| 2726 | return ERR_PTR(-ENOSPC); |
| 2727 | |
| 2728 | path = btrfs_alloc_path(); |
| 2729 | if (!path) { |
| 2730 | root->fs_info->enospc_unlink = 0; |
| 2731 | return ERR_PTR(-ENOMEM); |
| 2732 | } |
| 2733 | |
Josef Bacik | 3880a1b | 2011-10-14 14:46:51 -0400 | [diff] [blame] | 2734 | /* 1 for the orphan item */ |
| 2735 | trans = btrfs_start_transaction(root, 1); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2736 | if (IS_ERR(trans)) { |
| 2737 | btrfs_free_path(path); |
| 2738 | root->fs_info->enospc_unlink = 0; |
| 2739 | return trans; |
| 2740 | } |
| 2741 | |
| 2742 | path->skip_locking = 1; |
| 2743 | path->search_commit_root = 1; |
| 2744 | |
| 2745 | ret = btrfs_lookup_inode(trans, root, path, |
| 2746 | &BTRFS_I(dir)->location, 0); |
| 2747 | if (ret < 0) { |
| 2748 | err = ret; |
| 2749 | goto out; |
| 2750 | } |
| 2751 | if (ret == 0) { |
| 2752 | if (check_path_shared(root, path)) |
| 2753 | goto out; |
| 2754 | } else { |
| 2755 | check_link = 0; |
| 2756 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2757 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2758 | |
| 2759 | ret = btrfs_lookup_inode(trans, root, path, |
| 2760 | &BTRFS_I(inode)->location, 0); |
| 2761 | if (ret < 0) { |
| 2762 | err = ret; |
| 2763 | goto out; |
| 2764 | } |
| 2765 | if (ret == 0) { |
| 2766 | if (check_path_shared(root, path)) |
| 2767 | goto out; |
| 2768 | } else { |
| 2769 | check_link = 0; |
| 2770 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2771 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2772 | |
| 2773 | if (ret == 0 && S_ISREG(inode->i_mode)) { |
| 2774 | ret = btrfs_lookup_file_extent(trans, root, path, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2775 | ino, (u64)-1, 0); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2776 | if (ret < 0) { |
| 2777 | err = ret; |
| 2778 | goto out; |
| 2779 | } |
| 2780 | BUG_ON(ret == 0); |
| 2781 | if (check_path_shared(root, path)) |
| 2782 | goto out; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2783 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2784 | } |
| 2785 | |
| 2786 | if (!check_link) { |
| 2787 | err = 0; |
| 2788 | goto out; |
| 2789 | } |
| 2790 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2791 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2792 | dentry->d_name.name, dentry->d_name.len, 0); |
| 2793 | if (IS_ERR(di)) { |
| 2794 | err = PTR_ERR(di); |
| 2795 | goto out; |
| 2796 | } |
| 2797 | if (di) { |
| 2798 | if (check_path_shared(root, path)) |
| 2799 | goto out; |
| 2800 | } else { |
| 2801 | err = 0; |
| 2802 | goto out; |
| 2803 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2804 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2805 | |
| 2806 | ref = btrfs_lookup_inode_ref(trans, root, path, |
| 2807 | dentry->d_name.name, dentry->d_name.len, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2808 | ino, dir_ino, 0); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2809 | if (IS_ERR(ref)) { |
| 2810 | err = PTR_ERR(ref); |
| 2811 | goto out; |
| 2812 | } |
| 2813 | BUG_ON(!ref); |
| 2814 | if (check_path_shared(root, path)) |
| 2815 | goto out; |
| 2816 | index = btrfs_inode_ref_index(path->nodes[0], ref); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2817 | btrfs_release_path(path); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2818 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2819 | /* |
| 2820 | * This is a commit root search, if we can lookup inode item and other |
| 2821 | * relative items in the commit root, it means the transaction of |
| 2822 | * dir/file creation has been committed, and the dir index item that we |
| 2823 | * delay to insert has also been inserted into the commit root. So |
| 2824 | * we needn't worry about the delayed insertion of the dir index item |
| 2825 | * here. |
| 2826 | */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2827 | di = btrfs_lookup_dir_index_item(trans, root, path, dir_ino, index, |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2828 | dentry->d_name.name, dentry->d_name.len, 0); |
| 2829 | if (IS_ERR(di)) { |
| 2830 | err = PTR_ERR(di); |
| 2831 | goto out; |
| 2832 | } |
| 2833 | BUG_ON(ret == -ENOENT); |
| 2834 | if (check_path_shared(root, path)) |
| 2835 | goto out; |
| 2836 | |
| 2837 | err = 0; |
| 2838 | out: |
| 2839 | btrfs_free_path(path); |
Josef Bacik | 3880a1b | 2011-10-14 14:46:51 -0400 | [diff] [blame] | 2840 | /* Migrate the orphan reservation over */ |
| 2841 | if (!err) |
| 2842 | err = btrfs_block_rsv_migrate(trans->block_rsv, |
| 2843 | &root->fs_info->global_block_rsv, |
Josef Bacik | 5a77d76 | 2011-11-01 14:32:23 -0400 | [diff] [blame] | 2844 | trans->bytes_reserved); |
Josef Bacik | 3880a1b | 2011-10-14 14:46:51 -0400 | [diff] [blame] | 2845 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2846 | if (err) { |
| 2847 | btrfs_end_transaction(trans, root); |
| 2848 | root->fs_info->enospc_unlink = 0; |
| 2849 | return ERR_PTR(err); |
| 2850 | } |
| 2851 | |
| 2852 | trans->block_rsv = &root->fs_info->global_block_rsv; |
| 2853 | return trans; |
| 2854 | } |
| 2855 | |
| 2856 | static void __unlink_end_trans(struct btrfs_trans_handle *trans, |
| 2857 | struct btrfs_root *root) |
| 2858 | { |
| 2859 | if (trans->block_rsv == &root->fs_info->global_block_rsv) { |
Josef Bacik | 5a77d76 | 2011-11-01 14:32:23 -0400 | [diff] [blame] | 2860 | btrfs_block_rsv_release(root, trans->block_rsv, |
| 2861 | trans->bytes_reserved); |
| 2862 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2863 | BUG_ON(!root->fs_info->enospc_unlink); |
| 2864 | root->fs_info->enospc_unlink = 0; |
| 2865 | } |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 2866 | btrfs_end_transaction(trans, root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2867 | } |
| 2868 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2869 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
| 2870 | { |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2871 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2872 | struct btrfs_trans_handle *trans; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2873 | struct inode *inode = dentry->d_inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2874 | int ret; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 2875 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2876 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2877 | trans = __unlink_start_trans(dir, dentry); |
| 2878 | if (IS_ERR(trans)) |
Josef Bacik | 5df6a9f | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 2879 | return PTR_ERR(trans); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2880 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2881 | btrfs_record_unlink_dir(trans, dir, dentry->d_inode, 0); |
| 2882 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2883 | ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
| 2884 | dentry->d_name.name, dentry->d_name.len); |
Tsutomu Itoh | b532402 | 2011-07-19 07:27:20 +0000 | [diff] [blame] | 2885 | if (ret) |
| 2886 | goto out; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2887 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2888 | if (inode->i_nlink == 0) { |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2889 | ret = btrfs_orphan_add(trans, inode); |
Tsutomu Itoh | b532402 | 2011-07-19 07:27:20 +0000 | [diff] [blame] | 2890 | if (ret) |
| 2891 | goto out; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2892 | } |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2893 | |
Tsutomu Itoh | b532402 | 2011-07-19 07:27:20 +0000 | [diff] [blame] | 2894 | out: |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 2895 | nr = trans->blocks_used; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2896 | __unlink_end_trans(trans, root); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 2897 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2898 | return ret; |
| 2899 | } |
| 2900 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2901 | int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, |
| 2902 | struct btrfs_root *root, |
| 2903 | struct inode *dir, u64 objectid, |
| 2904 | const char *name, int name_len) |
| 2905 | { |
| 2906 | struct btrfs_path *path; |
| 2907 | struct extent_buffer *leaf; |
| 2908 | struct btrfs_dir_item *di; |
| 2909 | struct btrfs_key key; |
| 2910 | u64 index; |
| 2911 | int ret; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2912 | u64 dir_ino = btrfs_ino(dir); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2913 | |
| 2914 | path = btrfs_alloc_path(); |
| 2915 | if (!path) |
| 2916 | return -ENOMEM; |
| 2917 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2918 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2919 | name, name_len, -1); |
David Sterba | c704005 | 2011-04-19 18:00:01 +0200 | [diff] [blame] | 2920 | BUG_ON(IS_ERR_OR_NULL(di)); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2921 | |
| 2922 | leaf = path->nodes[0]; |
| 2923 | btrfs_dir_item_key_to_cpu(leaf, di, &key); |
| 2924 | WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid); |
| 2925 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
| 2926 | BUG_ON(ret); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2927 | btrfs_release_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2928 | |
| 2929 | ret = btrfs_del_root_ref(trans, root->fs_info->tree_root, |
| 2930 | objectid, root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2931 | dir_ino, &index, name, name_len); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2932 | if (ret < 0) { |
| 2933 | BUG_ON(ret != -ENOENT); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2934 | di = btrfs_search_dir_index_item(root, path, dir_ino, |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2935 | name, name_len); |
David Sterba | c704005 | 2011-04-19 18:00:01 +0200 | [diff] [blame] | 2936 | BUG_ON(IS_ERR_OR_NULL(di)); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2937 | |
| 2938 | leaf = path->nodes[0]; |
| 2939 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2940 | btrfs_release_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2941 | index = key.offset; |
| 2942 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 2943 | btrfs_release_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2944 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 2945 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
| 2946 | BUG_ON(ret); |
| 2947 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2948 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); |
| 2949 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
| 2950 | ret = btrfs_update_inode(trans, root, dir); |
| 2951 | BUG_ON(ret); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2952 | |
Josef Bacik | 71d7aed | 2011-06-14 14:24:32 -0400 | [diff] [blame] | 2953 | btrfs_free_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2954 | return 0; |
| 2955 | } |
| 2956 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2957 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 2958 | { |
| 2959 | struct inode *inode = dentry->d_inode; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 2960 | int err = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2961 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2962 | struct btrfs_trans_handle *trans; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 2963 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2964 | |
Chris Mason | 3394e16 | 2008-11-17 20:42:26 -0500 | [diff] [blame] | 2965 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE || |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2966 | btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID) |
Yan | 134d451 | 2007-10-25 15:49:25 -0400 | [diff] [blame] | 2967 | return -ENOTEMPTY; |
| 2968 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2969 | trans = __unlink_start_trans(dir, dentry); |
| 2970 | if (IS_ERR(trans)) |
Josef Bacik | 5df6a9f | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 2971 | return PTR_ERR(trans); |
Josef Bacik | 5df6a9f | 2009-11-10 21:23:48 -0500 | [diff] [blame] | 2972 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 2973 | if (unlikely(btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2974 | err = btrfs_unlink_subvol(trans, root, dir, |
| 2975 | BTRFS_I(inode)->location.objectid, |
| 2976 | dentry->d_name.name, |
| 2977 | dentry->d_name.len); |
| 2978 | goto out; |
| 2979 | } |
| 2980 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2981 | err = btrfs_orphan_add(trans, inode); |
| 2982 | if (err) |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2983 | goto out; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2984 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2985 | /* now the directory is empty */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2986 | err = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
| 2987 | dentry->d_name.name, dentry->d_name.len); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2988 | if (!err) |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 2989 | btrfs_i_size_write(inode, 0); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 2990 | out: |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 2991 | nr = trans->blocks_used; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 2992 | __unlink_end_trans(trans, root); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 2993 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 2994 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2995 | return err; |
| 2996 | } |
| 2997 | |
Chris Mason | 323ac95 | 2008-10-01 19:05:46 -0400 | [diff] [blame] | 2998 | /* |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2999 | * this can truncate away extent items, csum items and directory items. |
| 3000 | * 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] | 3001 | * any higher than new_size |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3002 | * |
| 3003 | * csum items that cross the new i_size are truncated to the new size |
| 3004 | * as well. |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3005 | * |
| 3006 | * min_type is the minimum key type to truncate down to. If set to 0, this |
| 3007 | * 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] | 3008 | */ |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3009 | int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
| 3010 | struct btrfs_root *root, |
| 3011 | struct inode *inode, |
| 3012 | u64 new_size, u32 min_type) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3013 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3014 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3015 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3016 | struct btrfs_file_extent_item *fi; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3017 | struct btrfs_key key; |
| 3018 | struct btrfs_key found_key; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3019 | u64 extent_start = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3020 | u64 extent_num_bytes = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3021 | u64 extent_offset = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3022 | u64 item_end = 0; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3023 | u64 mask = root->sectorsize - 1; |
| 3024 | u32 found_type = (u8)-1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3025 | int found_extent; |
| 3026 | int del_item; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3027 | int pending_del_nr = 0; |
| 3028 | int pending_del_slot = 0; |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 3029 | int extent_type = -1; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3030 | int ret; |
| 3031 | int err = 0; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3032 | u64 ino = btrfs_ino(inode); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3033 | |
| 3034 | BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3035 | |
Mark Fasheh | 0eb0e19 | 2011-07-12 16:44:10 -0700 | [diff] [blame] | 3036 | path = btrfs_alloc_path(); |
| 3037 | if (!path) |
| 3038 | return -ENOMEM; |
| 3039 | path->reada = -1; |
| 3040 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3041 | if (root->ref_cows || root == root->fs_info->tree_root) |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 3042 | btrfs_drop_extent_cache(inode, new_size & (~mask), (u64)-1, 0); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3043 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 3044 | /* |
| 3045 | * This function is also used to drop the items in the log tree before |
| 3046 | * we relog the inode, so if root != BTRFS_I(inode)->root, it means |
| 3047 | * it is used to drop the loged items. So we shouldn't kill the delayed |
| 3048 | * items. |
| 3049 | */ |
| 3050 | if (min_type == 0 && root == BTRFS_I(inode)->root) |
| 3051 | btrfs_kill_delayed_inode_items(inode); |
| 3052 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3053 | key.objectid = ino; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3054 | key.offset = (u64)-1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3055 | key.type = (u8)-1; |
| 3056 | |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3057 | search_again: |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 3058 | path->leave_spinning = 1; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3059 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3060 | if (ret < 0) { |
| 3061 | err = ret; |
| 3062 | goto out; |
| 3063 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3064 | |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3065 | if (ret > 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3066 | /* there are no items in the tree for us to truncate, we're |
| 3067 | * done |
| 3068 | */ |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3069 | if (path->slots[0] == 0) |
| 3070 | goto out; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3071 | path->slots[0]--; |
| 3072 | } |
| 3073 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3074 | while (1) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3075 | fi = NULL; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3076 | leaf = path->nodes[0]; |
| 3077 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 3078 | found_type = btrfs_key_type(&found_key); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3079 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3080 | if (found_key.objectid != ino) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3081 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3082 | |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3083 | if (found_type < min_type) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3084 | break; |
| 3085 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3086 | item_end = found_key.offset; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3087 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3088 | fi = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3089 | struct btrfs_file_extent_item); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 3090 | extent_type = btrfs_file_extent_type(leaf, fi); |
| 3091 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3092 | item_end += |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3093 | btrfs_file_extent_num_bytes(leaf, fi); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 3094 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 3095 | item_end += btrfs_file_extent_inline_len(leaf, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 3096 | fi); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3097 | } |
Yan | 008630c | 2007-11-07 13:31:09 -0500 | [diff] [blame] | 3098 | item_end--; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3099 | } |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3100 | if (found_type > min_type) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3101 | del_item = 1; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3102 | } else { |
| 3103 | if (item_end < new_size) |
| 3104 | break; |
| 3105 | if (found_key.offset >= new_size) |
| 3106 | del_item = 1; |
| 3107 | else |
| 3108 | del_item = 0; |
| 3109 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3110 | found_extent = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3111 | /* FIXME, shrink the extent if the ref count is only 1 */ |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 3112 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
| 3113 | goto delete; |
| 3114 | |
| 3115 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3116 | u64 num_dec; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3117 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
Miao Xie | f70a9a6 | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 3118 | if (!del_item) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3119 | u64 orig_num_bytes = |
| 3120 | btrfs_file_extent_num_bytes(leaf, fi); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3121 | extent_num_bytes = new_size - |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3122 | found_key.offset + root->sectorsize - 1; |
Yan | b1632b1 | 2008-01-30 11:54:04 -0500 | [diff] [blame] | 3123 | extent_num_bytes = extent_num_bytes & |
| 3124 | ~((u64)root->sectorsize - 1); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3125 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 3126 | extent_num_bytes); |
| 3127 | num_dec = (orig_num_bytes - |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 3128 | extent_num_bytes); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3129 | if (root->ref_cows && extent_start != 0) |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 3130 | inode_sub_bytes(inode, num_dec); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3131 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3132 | } else { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3133 | extent_num_bytes = |
| 3134 | btrfs_file_extent_disk_num_bytes(leaf, |
| 3135 | fi); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3136 | extent_offset = found_key.offset - |
| 3137 | btrfs_file_extent_offset(leaf, fi); |
| 3138 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3139 | /* FIXME blocksize != 4096 */ |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 3140 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3141 | if (extent_start != 0) { |
| 3142 | found_extent = 1; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3143 | if (root->ref_cows) |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 3144 | inode_sub_bytes(inode, num_dec); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3145 | } |
| 3146 | } |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 3147 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 3148 | /* |
| 3149 | * we can't truncate inline items that have had |
| 3150 | * special encodings |
| 3151 | */ |
| 3152 | if (!del_item && |
| 3153 | btrfs_file_extent_compression(leaf, fi) == 0 && |
| 3154 | btrfs_file_extent_encryption(leaf, fi) == 0 && |
| 3155 | btrfs_file_extent_other_encoding(leaf, fi) == 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3156 | u32 size = new_size - found_key.offset; |
| 3157 | |
| 3158 | if (root->ref_cows) { |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 3159 | inode_sub_bytes(inode, item_end + 1 - |
| 3160 | new_size); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3161 | } |
| 3162 | size = |
| 3163 | btrfs_file_extent_calc_inline_size(size); |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 3164 | ret = btrfs_truncate_item(trans, root, path, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3165 | size, 1); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3166 | } else if (root->ref_cows) { |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 3167 | inode_sub_bytes(inode, item_end + 1 - |
| 3168 | found_key.offset); |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 3169 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3170 | } |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 3171 | delete: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3172 | if (del_item) { |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3173 | if (!pending_del_nr) { |
| 3174 | /* no pending yet, add ourselves */ |
| 3175 | pending_del_slot = path->slots[0]; |
| 3176 | pending_del_nr = 1; |
| 3177 | } else if (pending_del_nr && |
| 3178 | path->slots[0] + 1 == pending_del_slot) { |
| 3179 | /* hop on the pending chunk */ |
| 3180 | pending_del_nr++; |
| 3181 | pending_del_slot = path->slots[0]; |
| 3182 | } else { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3183 | BUG(); |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3184 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3185 | } else { |
| 3186 | break; |
| 3187 | } |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3188 | if (found_extent && (root->ref_cows || |
| 3189 | root == root->fs_info->tree_root)) { |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 3190 | btrfs_set_path_blocking(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3191 | ret = btrfs_free_extent(trans, root, extent_start, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3192 | extent_num_bytes, 0, |
| 3193 | btrfs_header_owner(leaf), |
Arne Jansen | 66d7e7f | 2011-09-12 15:26:38 +0200 | [diff] [blame] | 3194 | ino, extent_offset, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3195 | BUG_ON(ret); |
| 3196 | } |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3197 | |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3198 | if (found_type == BTRFS_INODE_ITEM_KEY) |
| 3199 | break; |
| 3200 | |
| 3201 | if (path->slots[0] == 0 || |
| 3202 | path->slots[0] != pending_del_slot) { |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 3203 | if (root->ref_cows && |
| 3204 | BTRFS_I(inode)->location.objectid != |
| 3205 | BTRFS_FREE_INO_OBJECTID) { |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3206 | err = -EAGAIN; |
| 3207 | goto out; |
| 3208 | } |
| 3209 | if (pending_del_nr) { |
| 3210 | ret = btrfs_del_items(trans, root, path, |
| 3211 | pending_del_slot, |
| 3212 | pending_del_nr); |
| 3213 | BUG_ON(ret); |
| 3214 | pending_del_nr = 0; |
| 3215 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3216 | btrfs_release_path(path); |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3217 | goto search_again; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3218 | } else { |
| 3219 | path->slots[0]--; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3220 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3221 | } |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3222 | out: |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3223 | if (pending_del_nr) { |
| 3224 | ret = btrfs_del_items(trans, root, path, pending_del_slot, |
| 3225 | pending_del_nr); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 3226 | BUG_ON(ret); |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3227 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3228 | btrfs_free_path(path); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3229 | return err; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3230 | } |
| 3231 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3232 | /* |
| 3233 | * taken from block_truncate_page, but does cow as it zeros out |
| 3234 | * any bytes left in the last page in the file. |
| 3235 | */ |
| 3236 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) |
| 3237 | { |
| 3238 | struct inode *inode = mapping->host; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3239 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3240 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 3241 | struct btrfs_ordered_extent *ordered; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3242 | struct extent_state *cached_state = NULL; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3243 | char *kaddr; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 3244 | u32 blocksize = root->sectorsize; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3245 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
| 3246 | unsigned offset = from & (PAGE_CACHE_SIZE-1); |
| 3247 | struct page *page; |
Josef Bacik | 3b16a4e | 2011-09-21 15:05:58 -0400 | [diff] [blame] | 3248 | gfp_t mask = btrfs_alloc_write_mask(mapping); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3249 | int ret = 0; |
| 3250 | u64 page_start; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3251 | u64 page_end; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3252 | |
| 3253 | if ((offset & (blocksize - 1)) == 0) |
| 3254 | goto out; |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3255 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 3256 | if (ret) |
| 3257 | goto out; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3258 | |
| 3259 | ret = -ENOMEM; |
Chris Mason | 211c17f | 2008-05-15 09:13:45 -0400 | [diff] [blame] | 3260 | again: |
Josef Bacik | 3b16a4e | 2011-09-21 15:05:58 -0400 | [diff] [blame] | 3261 | page = find_or_create_page(mapping, index, mask); |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 3262 | if (!page) { |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3263 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3264 | goto out; |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 3265 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3266 | |
| 3267 | page_start = page_offset(page); |
| 3268 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
| 3269 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3270 | if (!PageUptodate(page)) { |
| 3271 | ret = btrfs_readpage(NULL, page); |
| 3272 | lock_page(page); |
Chris Mason | 211c17f | 2008-05-15 09:13:45 -0400 | [diff] [blame] | 3273 | if (page->mapping != mapping) { |
| 3274 | unlock_page(page); |
| 3275 | page_cache_release(page); |
| 3276 | goto again; |
| 3277 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3278 | if (!PageUptodate(page)) { |
| 3279 | ret = -EIO; |
Chris Mason | 8964222 | 2008-07-24 09:41:53 -0400 | [diff] [blame] | 3280 | goto out_unlock; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3281 | } |
| 3282 | } |
Chris Mason | 211c17f | 2008-05-15 09:13:45 -0400 | [diff] [blame] | 3283 | wait_on_page_writeback(page); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3284 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3285 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state, |
| 3286 | GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3287 | set_page_extent_mapped(page); |
| 3288 | |
| 3289 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 3290 | if (ordered) { |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3291 | unlock_extent_cached(io_tree, page_start, page_end, |
| 3292 | &cached_state, GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3293 | unlock_page(page); |
| 3294 | page_cache_release(page); |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 3295 | btrfs_start_ordered_extent(inode, ordered, 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3296 | btrfs_put_ordered_extent(ordered); |
| 3297 | goto again; |
| 3298 | } |
| 3299 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3300 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 3301 | EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING, |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3302 | 0, 0, &cached_state, GFP_NOFS); |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 3303 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3304 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
| 3305 | &cached_state); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3306 | if (ret) { |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3307 | unlock_extent_cached(io_tree, page_start, page_end, |
| 3308 | &cached_state, GFP_NOFS); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3309 | goto out_unlock; |
| 3310 | } |
| 3311 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3312 | ret = 0; |
| 3313 | if (offset != PAGE_CACHE_SIZE) { |
| 3314 | kaddr = kmap(page); |
| 3315 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); |
| 3316 | flush_dcache_page(page); |
| 3317 | kunmap(page); |
| 3318 | } |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 3319 | ClearPageChecked(page); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3320 | set_page_dirty(page); |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3321 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, |
| 3322 | GFP_NOFS); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3323 | |
Chris Mason | 8964222 | 2008-07-24 09:41:53 -0400 | [diff] [blame] | 3324 | out_unlock: |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 3325 | if (ret) |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 3326 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3327 | unlock_page(page); |
| 3328 | page_cache_release(page); |
| 3329 | out: |
| 3330 | return ret; |
| 3331 | } |
| 3332 | |
Josef Bacik | 695a0d0 | 2011-03-04 15:46:53 -0500 | [diff] [blame] | 3333 | /* |
| 3334 | * This function puts in dummy file extents for the area we're creating a hole |
| 3335 | * for. So if we are truncating this file to a larger size we need to insert |
| 3336 | * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for |
| 3337 | * the range between oldsize and size |
| 3338 | */ |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3339 | 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] | 3340 | { |
| 3341 | struct btrfs_trans_handle *trans; |
| 3342 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3343 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3344 | struct extent_map *em = NULL; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3345 | struct extent_state *cached_state = NULL; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3346 | u64 mask = root->sectorsize - 1; |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3347 | u64 hole_start = (oldsize + mask) & ~mask; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3348 | u64 block_end = (size + mask) & ~mask; |
| 3349 | u64 last_byte; |
| 3350 | u64 cur_offset; |
| 3351 | u64 hole_size; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3352 | int err = 0; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3353 | |
| 3354 | if (size <= hole_start) |
| 3355 | return 0; |
| 3356 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3357 | while (1) { |
| 3358 | struct btrfs_ordered_extent *ordered; |
| 3359 | btrfs_wait_ordered_range(inode, hole_start, |
| 3360 | block_end - hole_start); |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3361 | lock_extent_bits(io_tree, hole_start, block_end - 1, 0, |
| 3362 | &cached_state, GFP_NOFS); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3363 | ordered = btrfs_lookup_ordered_extent(inode, hole_start); |
| 3364 | if (!ordered) |
| 3365 | break; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3366 | unlock_extent_cached(io_tree, hole_start, block_end - 1, |
| 3367 | &cached_state, GFP_NOFS); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3368 | btrfs_put_ordered_extent(ordered); |
| 3369 | } |
| 3370 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3371 | cur_offset = hole_start; |
| 3372 | while (1) { |
| 3373 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, |
| 3374 | block_end - cur_offset, 0); |
David Sterba | c704005 | 2011-04-19 18:00:01 +0200 | [diff] [blame] | 3375 | BUG_ON(IS_ERR_OR_NULL(em)); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3376 | last_byte = min(extent_map_end(em), block_end); |
| 3377 | last_byte = (last_byte + mask) & ~mask; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3378 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 3379 | u64 hint_byte = 0; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3380 | hole_size = last_byte - cur_offset; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3381 | |
Miao Xie | 3642320 | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 3382 | trans = btrfs_start_transaction(root, 3); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3383 | if (IS_ERR(trans)) { |
| 3384 | err = PTR_ERR(trans); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 3385 | break; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3386 | } |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3387 | |
| 3388 | err = btrfs_drop_extents(trans, inode, cur_offset, |
| 3389 | cur_offset + hole_size, |
| 3390 | &hint_byte, 1); |
Miao Xie | 5b39737 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3391 | if (err) { |
Miao Xie | 3642320 | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 3392 | btrfs_update_inode(trans, root, inode); |
Miao Xie | 5b39737 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3393 | btrfs_end_transaction(trans, root); |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 3394 | break; |
Miao Xie | 5b39737 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3395 | } |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 3396 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3397 | err = btrfs_insert_file_extent(trans, root, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3398 | btrfs_ino(inode), cur_offset, 0, |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3399 | 0, hole_size, 0, hole_size, |
| 3400 | 0, 0, 0); |
Miao Xie | 5b39737 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3401 | if (err) { |
Miao Xie | 3642320 | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 3402 | btrfs_update_inode(trans, root, inode); |
Miao Xie | 5b39737 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3403 | btrfs_end_transaction(trans, root); |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 3404 | break; |
Miao Xie | 5b39737 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3405 | } |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3406 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3407 | btrfs_drop_extent_cache(inode, hole_start, |
| 3408 | last_byte - 1, 0); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3409 | |
Miao Xie | 3642320 | 2011-12-14 20:12:02 -0500 | [diff] [blame] | 3410 | btrfs_update_inode(trans, root, inode); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3411 | btrfs_end_transaction(trans, root); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3412 | } |
| 3413 | free_extent_map(em); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3414 | em = NULL; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3415 | cur_offset = last_byte; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3416 | if (cur_offset >= block_end) |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3417 | break; |
| 3418 | } |
| 3419 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 3420 | free_extent_map(em); |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 3421 | unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state, |
| 3422 | GFP_NOFS); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3423 | return err; |
| 3424 | } |
| 3425 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3426 | static int btrfs_setsize(struct inode *inode, loff_t newsize) |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3427 | { |
Miao Xie | f4a2f4c | 2011-12-14 20:12:01 -0500 | [diff] [blame] | 3428 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3429 | struct btrfs_trans_handle *trans; |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3430 | loff_t oldsize = i_size_read(inode); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3431 | int ret; |
| 3432 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3433 | if (newsize == oldsize) |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3434 | return 0; |
| 3435 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3436 | if (newsize > oldsize) { |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3437 | truncate_pagecache(inode, oldsize, newsize); |
| 3438 | ret = btrfs_cont_expand(inode, oldsize, newsize); |
Miao Xie | f4a2f4c | 2011-12-14 20:12:01 -0500 | [diff] [blame] | 3439 | if (ret) |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3440 | return ret; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3441 | |
Miao Xie | f4a2f4c | 2011-12-14 20:12:01 -0500 | [diff] [blame] | 3442 | trans = btrfs_start_transaction(root, 1); |
| 3443 | if (IS_ERR(trans)) |
| 3444 | return PTR_ERR(trans); |
| 3445 | |
| 3446 | i_size_write(inode, newsize); |
| 3447 | btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL); |
| 3448 | ret = btrfs_update_inode(trans, root, inode); |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 3449 | btrfs_end_transaction(trans, root); |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3450 | } else { |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3451 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3452 | /* |
| 3453 | * We're truncating a file that used to have good data down to |
| 3454 | * zero. Make sure it gets into the ordered flush list so that |
| 3455 | * any new writes get down to disk quickly. |
| 3456 | */ |
| 3457 | if (newsize == 0) |
| 3458 | BTRFS_I(inode)->ordered_data_close = 1; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3459 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3460 | /* we don't support swapfiles, so vmtruncate shouldn't fail */ |
| 3461 | truncate_setsize(inode, newsize); |
| 3462 | ret = btrfs_truncate(inode); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3463 | } |
| 3464 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3465 | return ret; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3466 | } |
| 3467 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3468 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
| 3469 | { |
| 3470 | struct inode *inode = dentry->d_inode; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 3471 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3472 | int err; |
| 3473 | |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 3474 | if (btrfs_root_readonly(root)) |
| 3475 | return -EROFS; |
| 3476 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3477 | err = inode_change_ok(inode, attr); |
| 3478 | if (err) |
| 3479 | return err; |
| 3480 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 3481 | if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 3482 | err = btrfs_setsize(inode, attr->ia_size); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3483 | if (err) |
| 3484 | return err; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3485 | } |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 3486 | |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 3487 | if (attr->ia_valid) { |
| 3488 | setattr_copy(inode, attr); |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 3489 | err = btrfs_dirty_inode(inode); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 3490 | |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 3491 | if (!err && attr->ia_valid & ATTR_MODE) |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 3492 | err = btrfs_acl_chmod(inode); |
| 3493 | } |
| 3494 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3495 | return err; |
| 3496 | } |
Chris Mason | 61295eb | 2008-01-14 16:24:38 -0500 | [diff] [blame] | 3497 | |
Al Viro | bd55597 | 2010-06-07 11:35:40 -0400 | [diff] [blame] | 3498 | void btrfs_evict_inode(struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3499 | { |
| 3500 | struct btrfs_trans_handle *trans; |
| 3501 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 726c35f | 2011-09-26 15:46:06 -0400 | [diff] [blame] | 3502 | struct btrfs_block_rsv *rsv, *global_rsv; |
Josef Bacik | 0712718 | 2011-08-19 10:29:59 -0400 | [diff] [blame] | 3503 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3504 | unsigned long nr; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3505 | int ret; |
| 3506 | |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 3507 | trace_btrfs_inode_evict(inode); |
| 3508 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3509 | truncate_inode_pages(&inode->i_data, 0); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3510 | if (inode->i_nlink && (btrfs_root_refs(&root->root_item) != 0 || |
Chris Mason | 2cf8572 | 2011-07-26 15:35:09 -0400 | [diff] [blame] | 3511 | btrfs_is_free_space_inode(root, inode))) |
Al Viro | bd55597 | 2010-06-07 11:35:40 -0400 | [diff] [blame] | 3512 | goto no_delete; |
| 3513 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3514 | if (is_bad_inode(inode)) { |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3515 | btrfs_orphan_del(NULL, inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3516 | goto no_delete; |
| 3517 | } |
Al Viro | bd55597 | 2010-06-07 11:35:40 -0400 | [diff] [blame] | 3518 | /* 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] | 3519 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3520 | |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 3521 | if (root->fs_info->log_root_recovering) { |
| 3522 | BUG_ON(!list_empty(&BTRFS_I(inode)->i_orphan)); |
| 3523 | goto no_delete; |
| 3524 | } |
| 3525 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3526 | if (inode->i_nlink > 0) { |
| 3527 | BUG_ON(btrfs_root_refs(&root->root_item) != 0); |
| 3528 | goto no_delete; |
| 3529 | } |
| 3530 | |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3531 | rsv = btrfs_alloc_block_rsv(root); |
| 3532 | if (!rsv) { |
| 3533 | btrfs_orphan_del(NULL, inode); |
| 3534 | goto no_delete; |
| 3535 | } |
Josef Bacik | 4a33854 | 2011-08-29 11:01:31 -0400 | [diff] [blame] | 3536 | rsv->size = min_size; |
Josef Bacik | 726c35f | 2011-09-26 15:46:06 -0400 | [diff] [blame] | 3537 | global_rsv = &root->fs_info->global_block_rsv; |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3538 | |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 3539 | btrfs_i_size_write(inode, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3540 | |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3541 | /* |
| 3542 | * This is a bit simpler than btrfs_truncate since |
| 3543 | * |
| 3544 | * 1) We've already reserved our space for our orphan item in the |
| 3545 | * unlink. |
| 3546 | * 2) We're going to delete the inode item, so we don't need to update |
| 3547 | * it at all. |
| 3548 | * |
| 3549 | * So we just need to reserve some slack space in case we add bytes when |
| 3550 | * doing the truncate. |
| 3551 | */ |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3552 | while (1) { |
Miao Xie | aa38a71 | 2011-11-18 17:43:00 +0800 | [diff] [blame] | 3553 | ret = btrfs_block_rsv_refill_noflush(root, rsv, min_size); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3554 | |
Josef Bacik | 726c35f | 2011-09-26 15:46:06 -0400 | [diff] [blame] | 3555 | /* |
| 3556 | * Try and steal from the global reserve since we will |
| 3557 | * likely not use this space anyway, we want to try as |
| 3558 | * hard as possible to get this to work. |
| 3559 | */ |
| 3560 | if (ret) |
| 3561 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, min_size); |
| 3562 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 3563 | if (ret) { |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3564 | printk(KERN_WARNING "Could not get space for a " |
Josef Bacik | 482e6dc | 2011-08-19 10:31:56 -0400 | [diff] [blame] | 3565 | "delete, will truncate on mount %d\n", ret); |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3566 | btrfs_orphan_del(NULL, inode); |
| 3567 | btrfs_free_block_rsv(root, rsv); |
| 3568 | goto no_delete; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 3569 | } |
| 3570 | |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3571 | trans = btrfs_start_transaction(root, 0); |
| 3572 | if (IS_ERR(trans)) { |
| 3573 | btrfs_orphan_del(NULL, inode); |
| 3574 | btrfs_free_block_rsv(root, rsv); |
| 3575 | goto no_delete; |
| 3576 | } |
| 3577 | |
| 3578 | trans->block_rsv = rsv; |
| 3579 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 3580 | ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3581 | if (ret != -EAGAIN) |
| 3582 | break; |
| 3583 | |
| 3584 | nr = trans->blocks_used; |
| 3585 | btrfs_end_transaction(trans, root); |
| 3586 | trans = NULL; |
| 3587 | btrfs_btree_balance_dirty(root, nr); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3588 | } |
| 3589 | |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3590 | btrfs_free_block_rsv(root, rsv); |
| 3591 | |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3592 | if (ret == 0) { |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3593 | trans->block_rsv = root->orphan_block_rsv; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3594 | ret = btrfs_orphan_del(trans, inode); |
| 3595 | BUG_ON(ret); |
| 3596 | } |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3597 | |
Josef Bacik | 4289a66 | 2011-08-05 13:22:24 -0400 | [diff] [blame] | 3598 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 3599 | if (!(root == root->fs_info->tree_root || |
| 3600 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)) |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3601 | btrfs_return_ino(root, btrfs_ino(inode)); |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 3602 | |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3603 | nr = trans->blocks_used; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3604 | btrfs_end_transaction(trans, root); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3605 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3606 | no_delete: |
Al Viro | bd55597 | 2010-06-07 11:35:40 -0400 | [diff] [blame] | 3607 | end_writeback(inode); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 3608 | return; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3609 | } |
| 3610 | |
| 3611 | /* |
| 3612 | * this returns the key found in the dir entry in the location pointer. |
| 3613 | * If no dir entries were found, location->objectid is 0. |
| 3614 | */ |
| 3615 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
| 3616 | struct btrfs_key *location) |
| 3617 | { |
| 3618 | const char *name = dentry->d_name.name; |
| 3619 | int namelen = dentry->d_name.len; |
| 3620 | struct btrfs_dir_item *di; |
| 3621 | struct btrfs_path *path; |
| 3622 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Yan | 0d9f7f3 | 2007-10-25 15:48:28 -0400 | [diff] [blame] | 3623 | int ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3624 | |
| 3625 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 3626 | if (!path) |
| 3627 | return -ENOMEM; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3628 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3629 | di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(dir), name, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3630 | namelen, 0); |
Yan | 0d9f7f3 | 2007-10-25 15:48:28 -0400 | [diff] [blame] | 3631 | if (IS_ERR(di)) |
| 3632 | ret = PTR_ERR(di); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3633 | |
David Sterba | c704005 | 2011-04-19 18:00:01 +0200 | [diff] [blame] | 3634 | if (IS_ERR_OR_NULL(di)) |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3635 | goto out_err; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3636 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3637 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3638 | out: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3639 | btrfs_free_path(path); |
| 3640 | return ret; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3641 | out_err: |
| 3642 | location->objectid = 0; |
| 3643 | goto out; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3644 | } |
| 3645 | |
| 3646 | /* |
| 3647 | * when we hit a tree root in a directory, the btrfs part of the inode |
| 3648 | * needs to be changed to reflect the root directory of the tree root. This |
| 3649 | * is kind of like crossing a mount point. |
| 3650 | */ |
| 3651 | static int fixup_tree_root_location(struct btrfs_root *root, |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3652 | struct inode *dir, |
| 3653 | struct dentry *dentry, |
| 3654 | struct btrfs_key *location, |
| 3655 | struct btrfs_root **sub_root) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3656 | { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3657 | struct btrfs_path *path; |
| 3658 | struct btrfs_root *new_root; |
| 3659 | struct btrfs_root_ref *ref; |
| 3660 | struct extent_buffer *leaf; |
| 3661 | int ret; |
| 3662 | int err = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3663 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3664 | path = btrfs_alloc_path(); |
| 3665 | if (!path) { |
| 3666 | err = -ENOMEM; |
| 3667 | goto out; |
| 3668 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3669 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3670 | err = -ENOENT; |
| 3671 | ret = btrfs_find_root_ref(root->fs_info->tree_root, path, |
| 3672 | BTRFS_I(dir)->root->root_key.objectid, |
| 3673 | location->objectid); |
| 3674 | if (ret) { |
| 3675 | if (ret < 0) |
| 3676 | err = ret; |
| 3677 | goto out; |
| 3678 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3679 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3680 | leaf = path->nodes[0]; |
| 3681 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3682 | if (btrfs_root_ref_dirid(leaf, ref) != btrfs_ino(dir) || |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3683 | btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len) |
| 3684 | goto out; |
| 3685 | |
| 3686 | ret = memcmp_extent_buffer(leaf, dentry->d_name.name, |
| 3687 | (unsigned long)(ref + 1), |
| 3688 | dentry->d_name.len); |
| 3689 | if (ret) |
| 3690 | goto out; |
| 3691 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 3692 | btrfs_release_path(path); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3693 | |
| 3694 | new_root = btrfs_read_fs_root_no_name(root->fs_info, location); |
| 3695 | if (IS_ERR(new_root)) { |
| 3696 | err = PTR_ERR(new_root); |
| 3697 | goto out; |
| 3698 | } |
| 3699 | |
| 3700 | if (btrfs_root_refs(&new_root->root_item) == 0) { |
| 3701 | err = -ENOENT; |
| 3702 | goto out; |
| 3703 | } |
| 3704 | |
| 3705 | *sub_root = new_root; |
| 3706 | location->objectid = btrfs_root_dirid(&new_root->root_item); |
| 3707 | location->type = BTRFS_INODE_ITEM_KEY; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3708 | location->offset = 0; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3709 | err = 0; |
| 3710 | out: |
| 3711 | btrfs_free_path(path); |
| 3712 | return err; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3713 | } |
| 3714 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3715 | static void inode_tree_add(struct inode *inode) |
| 3716 | { |
| 3717 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3718 | struct btrfs_inode *entry; |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 3719 | struct rb_node **p; |
| 3720 | struct rb_node *parent; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3721 | u64 ino = btrfs_ino(inode); |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 3722 | again: |
| 3723 | p = &root->inode_tree.rb_node; |
| 3724 | parent = NULL; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3725 | |
Al Viro | 1d3382c | 2010-10-23 15:19:20 -0400 | [diff] [blame] | 3726 | if (inode_unhashed(inode)) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3727 | return; |
| 3728 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3729 | spin_lock(&root->inode_lock); |
| 3730 | while (*p) { |
| 3731 | parent = *p; |
| 3732 | entry = rb_entry(parent, struct btrfs_inode, rb_node); |
| 3733 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3734 | if (ino < btrfs_ino(&entry->vfs_inode)) |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 3735 | p = &parent->rb_left; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3736 | else if (ino > btrfs_ino(&entry->vfs_inode)) |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 3737 | p = &parent->rb_right; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3738 | else { |
| 3739 | WARN_ON(!(entry->vfs_inode.i_state & |
Al Viro | a4ffdde | 2010-06-02 17:38:30 -0400 | [diff] [blame] | 3740 | (I_WILL_FREE | I_FREEING))); |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 3741 | rb_erase(parent, &root->inode_tree); |
| 3742 | RB_CLEAR_NODE(parent); |
| 3743 | spin_unlock(&root->inode_lock); |
| 3744 | goto again; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3745 | } |
| 3746 | } |
| 3747 | rb_link_node(&BTRFS_I(inode)->rb_node, parent, p); |
| 3748 | rb_insert_color(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
| 3749 | spin_unlock(&root->inode_lock); |
| 3750 | } |
| 3751 | |
| 3752 | static void inode_tree_del(struct inode *inode) |
| 3753 | { |
| 3754 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3755 | int empty = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3756 | |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 3757 | spin_lock(&root->inode_lock); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3758 | if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) { |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3759 | rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3760 | RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3761 | empty = RB_EMPTY_ROOT(&root->inode_tree); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3762 | } |
From: Nick Piggin | 03e860b | 2009-08-21 10:09:44 +0200 | [diff] [blame] | 3763 | spin_unlock(&root->inode_lock); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3764 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 3765 | /* |
| 3766 | * Free space cache has inodes in the tree root, but the tree root has a |
| 3767 | * root_refs of 0, so this could end up dropping the tree root as a |
| 3768 | * snapshot, so we need the extra !root->fs_info->tree_root check to |
| 3769 | * make sure we don't drop it. |
| 3770 | */ |
| 3771 | if (empty && btrfs_root_refs(&root->root_item) == 0 && |
| 3772 | root != root->fs_info->tree_root) { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3773 | synchronize_srcu(&root->fs_info->subvol_srcu); |
| 3774 | spin_lock(&root->inode_lock); |
| 3775 | empty = RB_EMPTY_ROOT(&root->inode_tree); |
| 3776 | spin_unlock(&root->inode_lock); |
| 3777 | if (empty) |
| 3778 | btrfs_add_dead_root(root); |
| 3779 | } |
| 3780 | } |
| 3781 | |
| 3782 | int btrfs_invalidate_inodes(struct btrfs_root *root) |
| 3783 | { |
| 3784 | struct rb_node *node; |
| 3785 | struct rb_node *prev; |
| 3786 | struct btrfs_inode *entry; |
| 3787 | struct inode *inode; |
| 3788 | u64 objectid = 0; |
| 3789 | |
| 3790 | WARN_ON(btrfs_root_refs(&root->root_item) != 0); |
| 3791 | |
| 3792 | spin_lock(&root->inode_lock); |
| 3793 | again: |
| 3794 | node = root->inode_tree.rb_node; |
| 3795 | prev = NULL; |
| 3796 | while (node) { |
| 3797 | prev = node; |
| 3798 | entry = rb_entry(node, struct btrfs_inode, rb_node); |
| 3799 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3800 | if (objectid < btrfs_ino(&entry->vfs_inode)) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3801 | node = node->rb_left; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3802 | else if (objectid > btrfs_ino(&entry->vfs_inode)) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3803 | node = node->rb_right; |
| 3804 | else |
| 3805 | break; |
| 3806 | } |
| 3807 | if (!node) { |
| 3808 | while (prev) { |
| 3809 | entry = rb_entry(prev, struct btrfs_inode, rb_node); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3810 | if (objectid <= btrfs_ino(&entry->vfs_inode)) { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3811 | node = prev; |
| 3812 | break; |
| 3813 | } |
| 3814 | prev = rb_next(prev); |
| 3815 | } |
| 3816 | } |
| 3817 | while (node) { |
| 3818 | entry = rb_entry(node, struct btrfs_inode, rb_node); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3819 | objectid = btrfs_ino(&entry->vfs_inode) + 1; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3820 | inode = igrab(&entry->vfs_inode); |
| 3821 | if (inode) { |
| 3822 | spin_unlock(&root->inode_lock); |
| 3823 | if (atomic_read(&inode->i_count) > 1) |
| 3824 | d_prune_aliases(inode); |
| 3825 | /* |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 3826 | * btrfs_drop_inode will have it removed from |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3827 | * the inode cache when its usage count |
| 3828 | * hits zero. |
| 3829 | */ |
| 3830 | iput(inode); |
| 3831 | cond_resched(); |
| 3832 | spin_lock(&root->inode_lock); |
| 3833 | goto again; |
| 3834 | } |
| 3835 | |
| 3836 | if (cond_resched_lock(&root->inode_lock)) |
| 3837 | goto again; |
| 3838 | |
| 3839 | node = rb_next(node); |
| 3840 | } |
| 3841 | spin_unlock(&root->inode_lock); |
| 3842 | return 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3843 | } |
| 3844 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3845 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
| 3846 | { |
| 3847 | struct btrfs_iget_args *args = p; |
| 3848 | inode->i_ino = args->ino; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3849 | BTRFS_I(inode)->root = args->root; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3850 | btrfs_set_inode_space_info(args->root, inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3851 | return 0; |
| 3852 | } |
| 3853 | |
| 3854 | static int btrfs_find_actor(struct inode *inode, void *opaque) |
| 3855 | { |
| 3856 | struct btrfs_iget_args *args = opaque; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 3857 | return args->ino == btrfs_ino(inode) && |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3858 | args->root == BTRFS_I(inode)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3859 | } |
| 3860 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3861 | static struct inode *btrfs_iget_locked(struct super_block *s, |
| 3862 | u64 objectid, |
| 3863 | struct btrfs_root *root) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3864 | { |
| 3865 | struct inode *inode; |
| 3866 | struct btrfs_iget_args args; |
| 3867 | args.ino = objectid; |
| 3868 | args.root = root; |
| 3869 | |
| 3870 | inode = iget5_locked(s, objectid, btrfs_find_actor, |
| 3871 | btrfs_init_locked_inode, |
| 3872 | (void *)&args); |
| 3873 | return inode; |
| 3874 | } |
| 3875 | |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 3876 | /* Get an inode object given its location and corresponding root. |
| 3877 | * Returns in *is_new if the inode was read from disk |
| 3878 | */ |
| 3879 | struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 3880 | struct btrfs_root *root, int *new) |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 3881 | { |
| 3882 | struct inode *inode; |
| 3883 | |
| 3884 | inode = btrfs_iget_locked(s, location->objectid, root); |
| 3885 | if (!inode) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3886 | return ERR_PTR(-ENOMEM); |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 3887 | |
| 3888 | if (inode->i_state & I_NEW) { |
| 3889 | BTRFS_I(inode)->root = root; |
| 3890 | memcpy(&BTRFS_I(inode)->location, location, sizeof(*location)); |
| 3891 | btrfs_read_locked_inode(inode); |
Mark Fasheh | 1748f84 | 2011-07-12 11:25:31 -0700 | [diff] [blame] | 3892 | if (!is_bad_inode(inode)) { |
| 3893 | inode_tree_add(inode); |
| 3894 | unlock_new_inode(inode); |
| 3895 | if (new) |
| 3896 | *new = 1; |
| 3897 | } else { |
Sergei Trofimovich | e0b6d65 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 3898 | unlock_new_inode(inode); |
| 3899 | iput(inode); |
| 3900 | inode = ERR_PTR(-ESTALE); |
Mark Fasheh | 1748f84 | 2011-07-12 11:25:31 -0700 | [diff] [blame] | 3901 | } |
| 3902 | } |
| 3903 | |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 3904 | return inode; |
| 3905 | } |
| 3906 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3907 | static struct inode *new_simple_dir(struct super_block *s, |
| 3908 | struct btrfs_key *key, |
| 3909 | struct btrfs_root *root) |
| 3910 | { |
| 3911 | struct inode *inode = new_inode(s); |
| 3912 | |
| 3913 | if (!inode) |
| 3914 | return ERR_PTR(-ENOMEM); |
| 3915 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3916 | BTRFS_I(inode)->root = root; |
| 3917 | memcpy(&BTRFS_I(inode)->location, key, sizeof(*key)); |
| 3918 | BTRFS_I(inode)->dummy_inode = 1; |
| 3919 | |
| 3920 | inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID; |
| 3921 | inode->i_op = &simple_dir_inode_operations; |
| 3922 | inode->i_fop = &simple_dir_operations; |
| 3923 | inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO; |
| 3924 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
| 3925 | |
| 3926 | return inode; |
| 3927 | } |
| 3928 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 3929 | struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3930 | { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3931 | struct inode *inode; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3932 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3933 | struct btrfs_root *sub_root = root; |
| 3934 | struct btrfs_key location; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3935 | int index; |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 3936 | int ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3937 | |
| 3938 | if (dentry->d_name.len > BTRFS_NAME_LEN) |
| 3939 | return ERR_PTR(-ENAMETOOLONG); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3940 | |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 3941 | if (unlikely(d_need_lookup(dentry))) { |
| 3942 | memcpy(&location, dentry->d_fsdata, sizeof(struct btrfs_key)); |
| 3943 | kfree(dentry->d_fsdata); |
| 3944 | dentry->d_fsdata = NULL; |
Josef Bacik | a66e7cc | 2011-09-18 10:34:03 -0400 | [diff] [blame] | 3945 | /* This thing is hashed, drop it for now */ |
| 3946 | d_drop(dentry); |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 3947 | } else { |
| 3948 | ret = btrfs_inode_by_name(dir, dentry, &location); |
| 3949 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3950 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3951 | if (ret < 0) |
| 3952 | return ERR_PTR(ret); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3953 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3954 | if (location.objectid == 0) |
| 3955 | return NULL; |
| 3956 | |
| 3957 | if (location.type == BTRFS_INODE_ITEM_KEY) { |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 3958 | inode = btrfs_iget(dir->i_sb, &location, root, NULL); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3959 | return inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3960 | } |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3961 | |
| 3962 | BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY); |
| 3963 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3964 | index = srcu_read_lock(&root->fs_info->subvol_srcu); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 3965 | ret = fixup_tree_root_location(root, dir, dentry, |
| 3966 | &location, &sub_root); |
| 3967 | if (ret < 0) { |
| 3968 | if (ret != -ENOENT) |
| 3969 | inode = ERR_PTR(ret); |
| 3970 | else |
| 3971 | inode = new_simple_dir(dir->i_sb, &location, sub_root); |
| 3972 | } else { |
Josef Bacik | 73f7341 | 2009-12-04 17:38:27 +0000 | [diff] [blame] | 3973 | inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3974 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3975 | srcu_read_unlock(&root->fs_info->subvol_srcu, index); |
| 3976 | |
Julia Lawall | 34d19ba | 2011-01-24 19:55:19 +0000 | [diff] [blame] | 3977 | if (!IS_ERR(inode) && root != sub_root) { |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 3978 | down_read(&root->fs_info->cleanup_work_sem); |
| 3979 | if (!(inode->i_sb->s_flags & MS_RDONLY)) |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 3980 | ret = btrfs_orphan_cleanup(sub_root); |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 3981 | up_read(&root->fs_info->cleanup_work_sem); |
Josef Bacik | 66b4ffd | 2011-01-31 16:22:42 -0500 | [diff] [blame] | 3982 | if (ret) |
| 3983 | inode = ERR_PTR(ret); |
Yan, Zheng | c71bf09 | 2009-11-12 09:34:40 +0000 | [diff] [blame] | 3984 | } |
| 3985 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 3986 | return inode; |
| 3987 | } |
| 3988 | |
Nick Piggin | fe15ce4 | 2011-01-07 17:49:23 +1100 | [diff] [blame] | 3989 | static int btrfs_dentry_delete(const struct dentry *dentry) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3990 | { |
| 3991 | struct btrfs_root *root; |
| 3992 | |
Yan, Zheng | efefb14 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 3993 | if (!dentry->d_inode && !IS_ROOT(dentry)) |
| 3994 | dentry = dentry->d_parent; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 3995 | |
Yan, Zheng | efefb14 | 2009-10-09 09:25:16 -0400 | [diff] [blame] | 3996 | if (dentry->d_inode) { |
| 3997 | root = BTRFS_I(dentry->d_inode)->root; |
| 3998 | if (btrfs_root_refs(&root->root_item) == 0) |
| 3999 | return 1; |
| 4000 | } |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 4001 | return 0; |
| 4002 | } |
| 4003 | |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 4004 | static void btrfs_dentry_release(struct dentry *dentry) |
| 4005 | { |
| 4006 | if (dentry->d_fsdata) |
| 4007 | kfree(dentry->d_fsdata); |
| 4008 | } |
| 4009 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4010 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
| 4011 | struct nameidata *nd) |
| 4012 | { |
Josef Bacik | a66e7cc | 2011-09-18 10:34:03 -0400 | [diff] [blame] | 4013 | struct dentry *ret; |
| 4014 | |
| 4015 | ret = d_splice_alias(btrfs_lookup_dentry(dir, dentry), dentry); |
| 4016 | if (unlikely(d_need_lookup(dentry))) { |
| 4017 | spin_lock(&dentry->d_lock); |
| 4018 | dentry->d_flags &= ~DCACHE_NEED_LOOKUP; |
| 4019 | spin_unlock(&dentry->d_lock); |
| 4020 | } |
| 4021 | return ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4022 | } |
| 4023 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4024 | unsigned char btrfs_filetype_table[] = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4025 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK |
| 4026 | }; |
| 4027 | |
David Woodhouse | cbdf5a2 | 2008-08-06 19:42:33 +0100 | [diff] [blame] | 4028 | static int btrfs_real_readdir(struct file *filp, void *dirent, |
| 4029 | filldir_t filldir) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4030 | { |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 4031 | struct inode *inode = filp->f_dentry->d_inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4032 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4033 | struct btrfs_item *item; |
| 4034 | struct btrfs_dir_item *di; |
| 4035 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4036 | struct btrfs_key found_key; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4037 | struct btrfs_path *path; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4038 | struct list_head ins_list; |
| 4039 | struct list_head del_list; |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 4040 | struct qstr q; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4041 | int ret; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4042 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4043 | int slot; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4044 | unsigned char d_type; |
| 4045 | int over = 0; |
| 4046 | u32 di_cur; |
| 4047 | u32 di_total; |
| 4048 | u32 di_len; |
| 4049 | int key_type = BTRFS_DIR_INDEX_KEY; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4050 | char tmp_name[32]; |
| 4051 | char *name_ptr; |
| 4052 | int name_len; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4053 | int is_curr = 0; /* filp->f_pos points to the current index? */ |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4054 | |
| 4055 | /* FIXME, use a real flag for deciding about the key type */ |
| 4056 | if (root->fs_info->tree_root == root) |
| 4057 | key_type = BTRFS_DIR_ITEM_KEY; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4058 | |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 4059 | /* special case for "." */ |
| 4060 | if (filp->f_pos == 0) { |
Hidetoshi Seto | 3765fef | 2011-09-18 10:20:46 -0400 | [diff] [blame] | 4061 | over = filldir(dirent, ".", 1, |
| 4062 | filp->f_pos, btrfs_ino(inode), DT_DIR); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 4063 | if (over) |
| 4064 | return 0; |
| 4065 | filp->f_pos = 1; |
| 4066 | } |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 4067 | /* special case for .., just use the back ref */ |
| 4068 | if (filp->f_pos == 1) { |
David Woodhouse | 5ecc7e5 | 2008-08-17 15:14:48 +0100 | [diff] [blame] | 4069 | u64 pino = parent_ino(filp->f_path.dentry); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 4070 | over = filldir(dirent, "..", 2, |
Hidetoshi Seto | 3765fef | 2011-09-18 10:20:46 -0400 | [diff] [blame] | 4071 | filp->f_pos, pino, DT_DIR); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 4072 | if (over) |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4073 | return 0; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 4074 | filp->f_pos = 2; |
| 4075 | } |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4076 | path = btrfs_alloc_path(); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4077 | if (!path) |
| 4078 | return -ENOMEM; |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 4079 | |
Josef Bacik | 026fd31 | 2011-05-13 10:32:11 -0400 | [diff] [blame] | 4080 | path->reada = 1; |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4081 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4082 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
| 4083 | INIT_LIST_HEAD(&ins_list); |
| 4084 | INIT_LIST_HEAD(&del_list); |
| 4085 | btrfs_get_delayed_items(inode, &ins_list, &del_list); |
| 4086 | } |
| 4087 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4088 | btrfs_set_key_type(&key, key_type); |
| 4089 | key.offset = filp->f_pos; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4090 | key.objectid = btrfs_ino(inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4091 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4092 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 4093 | if (ret < 0) |
| 4094 | goto err; |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4095 | |
| 4096 | while (1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4097 | leaf = path->nodes[0]; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4098 | slot = path->slots[0]; |
Li Zefan | b9e03af | 2011-03-23 10:43:58 +0800 | [diff] [blame] | 4099 | if (slot >= btrfs_header_nritems(leaf)) { |
| 4100 | ret = btrfs_next_leaf(root, path); |
| 4101 | if (ret < 0) |
| 4102 | goto err; |
| 4103 | else if (ret > 0) |
| 4104 | break; |
| 4105 | continue; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4106 | } |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4107 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4108 | item = btrfs_item_nr(leaf, slot); |
| 4109 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 4110 | |
| 4111 | if (found_key.objectid != key.objectid) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4112 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4113 | if (btrfs_key_type(&found_key) != key_type) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4114 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4115 | if (found_key.offset < filp->f_pos) |
Li Zefan | b9e03af | 2011-03-23 10:43:58 +0800 | [diff] [blame] | 4116 | goto next; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4117 | if (key_type == BTRFS_DIR_INDEX_KEY && |
| 4118 | btrfs_should_delete_dir_index(&del_list, |
| 4119 | found_key.offset)) |
| 4120 | goto next; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4121 | |
| 4122 | filp->f_pos = found_key.offset; |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4123 | is_curr = 1; |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4124 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4125 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
| 4126 | di_cur = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4127 | di_total = btrfs_item_size(leaf, item); |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4128 | |
| 4129 | while (di_cur < di_total) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4130 | struct btrfs_key location; |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 4131 | struct dentry *tmp; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4132 | |
Josef Bacik | 22a94d4 | 2011-03-16 16:47:17 -0400 | [diff] [blame] | 4133 | if (verify_dir_item(root, leaf, di)) |
| 4134 | break; |
| 4135 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4136 | name_len = btrfs_dir_name_len(leaf, di); |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4137 | if (name_len <= sizeof(tmp_name)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4138 | name_ptr = tmp_name; |
| 4139 | } else { |
| 4140 | name_ptr = kmalloc(name_len, GFP_NOFS); |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4141 | if (!name_ptr) { |
| 4142 | ret = -ENOMEM; |
| 4143 | goto err; |
| 4144 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4145 | } |
| 4146 | read_extent_buffer(leaf, name_ptr, |
| 4147 | (unsigned long)(di + 1), name_len); |
| 4148 | |
| 4149 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; |
| 4150 | btrfs_dir_item_key_to_cpu(leaf, di, &location); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4151 | |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 4152 | q.name = name_ptr; |
| 4153 | q.len = name_len; |
| 4154 | q.hash = full_name_hash(q.name, q.len); |
| 4155 | tmp = d_lookup(filp->f_dentry, &q); |
| 4156 | if (!tmp) { |
| 4157 | struct btrfs_key *newkey; |
| 4158 | |
| 4159 | newkey = kzalloc(sizeof(struct btrfs_key), |
| 4160 | GFP_NOFS); |
| 4161 | if (!newkey) |
| 4162 | goto no_dentry; |
| 4163 | tmp = d_alloc(filp->f_dentry, &q); |
| 4164 | if (!tmp) { |
| 4165 | kfree(newkey); |
| 4166 | dput(tmp); |
| 4167 | goto no_dentry; |
| 4168 | } |
| 4169 | memcpy(newkey, &location, |
| 4170 | sizeof(struct btrfs_key)); |
| 4171 | tmp->d_fsdata = newkey; |
| 4172 | tmp->d_flags |= DCACHE_NEED_LOOKUP; |
| 4173 | d_rehash(tmp); |
| 4174 | dput(tmp); |
| 4175 | } else { |
| 4176 | dput(tmp); |
| 4177 | } |
| 4178 | no_dentry: |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4179 | /* is this a reference to our own snapshot? If so |
| 4180 | * skip it |
| 4181 | */ |
| 4182 | if (location.type == BTRFS_ROOT_ITEM_KEY && |
| 4183 | location.objectid == root->root_key.objectid) { |
| 4184 | over = 0; |
| 4185 | goto skip; |
| 4186 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4187 | over = filldir(dirent, name_ptr, name_len, |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4188 | found_key.offset, location.objectid, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4189 | d_type); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4190 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4191 | skip: |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4192 | if (name_ptr != tmp_name) |
| 4193 | kfree(name_ptr); |
| 4194 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4195 | if (over) |
| 4196 | goto nopos; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 4197 | di_len = btrfs_dir_name_len(leaf, di) + |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4198 | btrfs_dir_data_len(leaf, di) + sizeof(*di); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4199 | di_cur += di_len; |
| 4200 | di = (struct btrfs_dir_item *)((char *)di + di_len); |
| 4201 | } |
Li Zefan | b9e03af | 2011-03-23 10:43:58 +0800 | [diff] [blame] | 4202 | next: |
| 4203 | path->slots[0]++; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4204 | } |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4205 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4206 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
| 4207 | if (is_curr) |
| 4208 | filp->f_pos++; |
| 4209 | ret = btrfs_readdir_delayed_dir_index(filp, dirent, filldir, |
| 4210 | &ins_list); |
| 4211 | if (ret) |
| 4212 | goto nopos; |
| 4213 | } |
| 4214 | |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 4215 | /* Reached end of directory/root. Bump pos past the last item. */ |
Yan Zheng | 5e591a0 | 2008-02-19 11:41:02 -0500 | [diff] [blame] | 4216 | if (key_type == BTRFS_DIR_INDEX_KEY) |
Jan Engelhardt | 406266a | 2009-12-09 22:00:38 +0000 | [diff] [blame] | 4217 | /* |
| 4218 | * 32-bit glibc will use getdents64, but then strtol - |
| 4219 | * so the last number we can serve is this. |
| 4220 | */ |
| 4221 | filp->f_pos = 0x7fffffff; |
Yan Zheng | 5e591a0 | 2008-02-19 11:41:02 -0500 | [diff] [blame] | 4222 | else |
| 4223 | filp->f_pos++; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4224 | nopos: |
| 4225 | ret = 0; |
| 4226 | err: |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4227 | if (key_type == BTRFS_DIR_INDEX_KEY) |
| 4228 | btrfs_put_delayed_items(&ins_list, &del_list); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4229 | btrfs_free_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4230 | return ret; |
| 4231 | } |
| 4232 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 4233 | int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4234 | { |
| 4235 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4236 | struct btrfs_trans_handle *trans; |
| 4237 | int ret = 0; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4238 | bool nolock = false; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4239 | |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4240 | if (BTRFS_I(inode)->dummy_inode) |
Chris Mason | 4ca8b41 | 2008-08-05 13:30:48 -0400 | [diff] [blame] | 4241 | return 0; |
| 4242 | |
Chris Mason | 2cf8572 | 2011-07-26 15:35:09 -0400 | [diff] [blame] | 4243 | if (btrfs_fs_closing(root->fs_info) && btrfs_is_free_space_inode(root, inode)) |
Li Zefan | 82d5902 | 2011-04-20 10:33:24 +0800 | [diff] [blame] | 4244 | nolock = true; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4245 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 4246 | if (wbc->sync_mode == WB_SYNC_ALL) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4247 | if (nolock) |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 4248 | trans = btrfs_join_transaction_nolock(root); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4249 | else |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 4250 | trans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 4251 | if (IS_ERR(trans)) |
| 4252 | return PTR_ERR(trans); |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 4253 | if (nolock) |
| 4254 | ret = btrfs_end_transaction_nolock(trans, root); |
| 4255 | else |
| 4256 | ret = btrfs_commit_transaction(trans, root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4257 | } |
| 4258 | return ret; |
| 4259 | } |
| 4260 | |
| 4261 | /* |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 4262 | * This is somewhat expensive, updating the tree every time the |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4263 | * inode changes. But, it is most likely to find the inode in cache. |
| 4264 | * FIXME, needs more benchmarking...there are no reasons other than performance |
| 4265 | * to keep or drop this code. |
| 4266 | */ |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 4267 | int btrfs_dirty_inode(struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4268 | { |
| 4269 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4270 | struct btrfs_trans_handle *trans; |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4271 | int ret; |
| 4272 | |
| 4273 | if (BTRFS_I(inode)->dummy_inode) |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 4274 | return 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4275 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 4276 | trans = btrfs_join_transaction(root); |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 4277 | if (IS_ERR(trans)) |
| 4278 | return PTR_ERR(trans); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4279 | |
| 4280 | ret = btrfs_update_inode(trans, root, inode); |
Chris Mason | 94b6044 | 2010-05-26 11:02:00 -0400 | [diff] [blame] | 4281 | if (ret && ret == -ENOSPC) { |
| 4282 | /* whoops, lets try again with the full transaction */ |
| 4283 | btrfs_end_transaction(trans, root); |
| 4284 | trans = btrfs_start_transaction(root, 1); |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 4285 | if (IS_ERR(trans)) |
| 4286 | return PTR_ERR(trans); |
Yan, Zheng | 8929ecfa | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 4287 | |
Chris Mason | 94b6044 | 2010-05-26 11:02:00 -0400 | [diff] [blame] | 4288 | ret = btrfs_update_inode(trans, root, inode); |
Chris Mason | 94b6044 | 2010-05-26 11:02:00 -0400 | [diff] [blame] | 4289 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4290 | btrfs_end_transaction(trans, root); |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4291 | if (BTRFS_I(inode)->delayed_node) |
| 4292 | btrfs_balance_delayed_items(root); |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 4293 | |
| 4294 | return ret; |
| 4295 | } |
| 4296 | |
| 4297 | /* |
| 4298 | * This is a copy of file_update_time. We need this so we can return error on |
| 4299 | * ENOSPC for updating the inode in the case of file write and mmap writes. |
| 4300 | */ |
| 4301 | int btrfs_update_time(struct file *file) |
| 4302 | { |
| 4303 | struct inode *inode = file->f_path.dentry->d_inode; |
| 4304 | struct timespec now; |
| 4305 | int ret; |
| 4306 | enum { S_MTIME = 1, S_CTIME = 2, S_VERSION = 4 } sync_it = 0; |
| 4307 | |
| 4308 | /* First try to exhaust all avenues to not sync */ |
| 4309 | if (IS_NOCMTIME(inode)) |
| 4310 | return 0; |
| 4311 | |
| 4312 | now = current_fs_time(inode->i_sb); |
| 4313 | if (!timespec_equal(&inode->i_mtime, &now)) |
| 4314 | sync_it = S_MTIME; |
| 4315 | |
| 4316 | if (!timespec_equal(&inode->i_ctime, &now)) |
| 4317 | sync_it |= S_CTIME; |
| 4318 | |
| 4319 | if (IS_I_VERSION(inode)) |
| 4320 | sync_it |= S_VERSION; |
| 4321 | |
| 4322 | if (!sync_it) |
| 4323 | return 0; |
| 4324 | |
| 4325 | /* Finally allowed to write? Takes lock. */ |
| 4326 | if (mnt_want_write_file(file)) |
| 4327 | return 0; |
| 4328 | |
| 4329 | /* Only change inode inside the lock region */ |
| 4330 | if (sync_it & S_VERSION) |
| 4331 | inode_inc_iversion(inode); |
| 4332 | if (sync_it & S_CTIME) |
| 4333 | inode->i_ctime = now; |
| 4334 | if (sync_it & S_MTIME) |
| 4335 | inode->i_mtime = now; |
| 4336 | ret = btrfs_dirty_inode(inode); |
| 4337 | if (!ret) |
| 4338 | mark_inode_dirty_sync(inode); |
| 4339 | mnt_drop_write(file->f_path.mnt); |
| 4340 | return ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4341 | } |
| 4342 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4343 | /* |
| 4344 | * find the highest existing sequence number in a directory |
| 4345 | * and then set the in-memory index_cnt variable to reflect |
| 4346 | * free sequence numbers |
| 4347 | */ |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4348 | static int btrfs_set_inode_index_count(struct inode *inode) |
| 4349 | { |
| 4350 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4351 | struct btrfs_key key, found_key; |
| 4352 | struct btrfs_path *path; |
| 4353 | struct extent_buffer *leaf; |
| 4354 | int ret; |
| 4355 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4356 | key.objectid = btrfs_ino(inode); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4357 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); |
| 4358 | key.offset = (u64)-1; |
| 4359 | |
| 4360 | path = btrfs_alloc_path(); |
| 4361 | if (!path) |
| 4362 | return -ENOMEM; |
| 4363 | |
| 4364 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 4365 | if (ret < 0) |
| 4366 | goto out; |
| 4367 | /* FIXME: we should be able to handle this */ |
| 4368 | if (ret == 0) |
| 4369 | goto out; |
| 4370 | ret = 0; |
| 4371 | |
| 4372 | /* |
| 4373 | * MAGIC NUMBER EXPLANATION: |
| 4374 | * since we search a directory based on f_pos we have to start at 2 |
| 4375 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody |
| 4376 | * else has to start at 2 |
| 4377 | */ |
| 4378 | if (path->slots[0] == 0) { |
| 4379 | BTRFS_I(inode)->index_cnt = 2; |
| 4380 | goto out; |
| 4381 | } |
| 4382 | |
| 4383 | path->slots[0]--; |
| 4384 | |
| 4385 | leaf = path->nodes[0]; |
| 4386 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 4387 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4388 | if (found_key.objectid != btrfs_ino(inode) || |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4389 | btrfs_key_type(&found_key) != BTRFS_DIR_INDEX_KEY) { |
| 4390 | BTRFS_I(inode)->index_cnt = 2; |
| 4391 | goto out; |
| 4392 | } |
| 4393 | |
| 4394 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; |
| 4395 | out: |
| 4396 | btrfs_free_path(path); |
| 4397 | return ret; |
| 4398 | } |
| 4399 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4400 | /* |
| 4401 | * helper to find a free sequence number in a given directory. This current |
| 4402 | * code is very simple, later versions will do smarter things in the btree |
| 4403 | */ |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4404 | int btrfs_set_inode_index(struct inode *dir, u64 *index) |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4405 | { |
| 4406 | int ret = 0; |
| 4407 | |
| 4408 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4409 | ret = btrfs_inode_delayed_dir_index_count(dir); |
| 4410 | if (ret) { |
| 4411 | ret = btrfs_set_inode_index_count(dir); |
| 4412 | if (ret) |
| 4413 | return ret; |
| 4414 | } |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4415 | } |
| 4416 | |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4417 | *index = BTRFS_I(dir)->index_cnt; |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4418 | BTRFS_I(dir)->index_cnt++; |
| 4419 | |
| 4420 | return ret; |
| 4421 | } |
| 4422 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4423 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
| 4424 | struct btrfs_root *root, |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4425 | struct inode *dir, |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4426 | const char *name, int name_len, |
Al Viro | 175a4eb | 2011-07-26 03:30:54 -0400 | [diff] [blame] | 4427 | u64 ref_objectid, u64 objectid, |
| 4428 | umode_t mode, u64 *index) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4429 | { |
| 4430 | struct inode *inode; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4431 | struct btrfs_inode_item *inode_item; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4432 | struct btrfs_key *location; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4433 | struct btrfs_path *path; |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4434 | struct btrfs_inode_ref *ref; |
| 4435 | struct btrfs_key key[2]; |
| 4436 | u32 sizes[2]; |
| 4437 | unsigned long ptr; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4438 | int ret; |
| 4439 | int owner; |
| 4440 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4441 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 4442 | if (!path) |
| 4443 | return ERR_PTR(-ENOMEM); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4444 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4445 | inode = new_inode(root->fs_info->sb); |
Yoshinori Sano | 8fb2764 | 2011-04-09 02:30:07 +0000 | [diff] [blame] | 4446 | if (!inode) { |
| 4447 | btrfs_free_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4448 | return ERR_PTR(-ENOMEM); |
Yoshinori Sano | 8fb2764 | 2011-04-09 02:30:07 +0000 | [diff] [blame] | 4449 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4450 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 4451 | /* |
| 4452 | * we have to initialize this early, so we can reclaim the inode |
| 4453 | * number if we fail afterwards in this function. |
| 4454 | */ |
| 4455 | inode->i_ino = objectid; |
| 4456 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4457 | if (dir) { |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 4458 | trace_btrfs_inode_request(dir); |
| 4459 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4460 | ret = btrfs_set_inode_index(dir, index); |
Shen Feng | 0977143 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 4461 | if (ret) { |
Yoshinori Sano | 8fb2764 | 2011-04-09 02:30:07 +0000 | [diff] [blame] | 4462 | btrfs_free_path(path); |
Shen Feng | 0977143 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 4463 | iput(inode); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4464 | return ERR_PTR(ret); |
Shen Feng | 0977143 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 4465 | } |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4466 | } |
| 4467 | /* |
| 4468 | * index_cnt is ignored for everything but a dir, |
| 4469 | * btrfs_get_inode_index_count has an explanation for the magic |
| 4470 | * number |
| 4471 | */ |
| 4472 | BTRFS_I(inode)->index_cnt = 2; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4473 | BTRFS_I(inode)->root = root; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4474 | BTRFS_I(inode)->generation = trans->transid; |
Josef Bacik | 7619585 | 2010-11-19 02:18:02 +0000 | [diff] [blame] | 4475 | inode->i_generation = BTRFS_I(inode)->generation; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 4476 | btrfs_set_inode_space_info(root, inode); |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4477 | |
Al Viro | 569254b | 2011-07-24 17:08:40 -0400 | [diff] [blame] | 4478 | if (S_ISDIR(mode)) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4479 | owner = 0; |
| 4480 | else |
| 4481 | owner = 1; |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4482 | |
| 4483 | key[0].objectid = objectid; |
| 4484 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); |
| 4485 | key[0].offset = 0; |
| 4486 | |
| 4487 | key[1].objectid = objectid; |
| 4488 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); |
| 4489 | key[1].offset = ref_objectid; |
| 4490 | |
| 4491 | sizes[0] = sizeof(struct btrfs_inode_item); |
| 4492 | sizes[1] = name_len + sizeof(*ref); |
| 4493 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 4494 | path->leave_spinning = 1; |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4495 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); |
| 4496 | if (ret != 0) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4497 | goto fail; |
| 4498 | |
Dmitry Monakhov | ecc11fab | 2010-03-04 17:31:47 +0300 | [diff] [blame] | 4499 | inode_init_owner(inode, dir, mode); |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 4500 | inode_set_bytes(inode, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4501 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4502 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 4503 | struct btrfs_inode_item); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4504 | fill_inode_item(trans, path->nodes[0], inode_item, inode); |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4505 | |
| 4506 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, |
| 4507 | struct btrfs_inode_ref); |
| 4508 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4509 | btrfs_set_inode_ref_index(path->nodes[0], ref, *index); |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4510 | ptr = (unsigned long)(ref + 1); |
| 4511 | write_extent_buffer(path->nodes[0], name, ptr, name_len); |
| 4512 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4513 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 4514 | btrfs_free_path(path); |
| 4515 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4516 | location = &BTRFS_I(inode)->location; |
| 4517 | location->objectid = objectid; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4518 | location->offset = 0; |
| 4519 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
| 4520 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 4521 | btrfs_inherit_iflags(inode, dir); |
| 4522 | |
Al Viro | 569254b | 2011-07-24 17:08:40 -0400 | [diff] [blame] | 4523 | if (S_ISREG(mode)) { |
Chris Mason | 9427216 | 2009-07-02 12:26:06 -0400 | [diff] [blame] | 4524 | if (btrfs_test_opt(root, NODATASUM)) |
| 4525 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 4526 | if (btrfs_test_opt(root, NODATACOW) || |
| 4527 | (BTRFS_I(dir)->flags & BTRFS_INODE_NODATACOW)) |
Chris Mason | 9427216 | 2009-07-02 12:26:06 -0400 | [diff] [blame] | 4528 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
| 4529 | } |
| 4530 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4531 | insert_inode_hash(inode); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4532 | inode_tree_add(inode); |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 4533 | |
| 4534 | trace_btrfs_inode_new(inode); |
Chris Mason | 1973f0f | 2011-06-24 13:13:29 -0400 | [diff] [blame] | 4535 | btrfs_set_inode_last_trans(trans, inode); |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 4536 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4537 | return inode; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4538 | fail: |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4539 | if (dir) |
| 4540 | BTRFS_I(dir)->index_cnt--; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4541 | btrfs_free_path(path); |
Shen Feng | 0977143 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 4542 | iput(inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4543 | return ERR_PTR(ret); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4544 | } |
| 4545 | |
| 4546 | static inline u8 btrfs_inode_type(struct inode *inode) |
| 4547 | { |
| 4548 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; |
| 4549 | } |
| 4550 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4551 | /* |
| 4552 | * utility function to add 'inode' into 'parent_inode' with |
| 4553 | * a give name and a given sequence number. |
| 4554 | * if 'add_backref' is true, also insert a backref from the |
| 4555 | * inode to the parent directory. |
| 4556 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4557 | int btrfs_add_link(struct btrfs_trans_handle *trans, |
| 4558 | struct inode *parent_inode, struct inode *inode, |
| 4559 | const char *name, int name_len, int add_backref, u64 index) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4560 | { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4561 | int ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4562 | struct btrfs_key key; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4563 | struct btrfs_root *root = BTRFS_I(parent_inode)->root; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4564 | u64 ino = btrfs_ino(inode); |
| 4565 | u64 parent_ino = btrfs_ino(parent_inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4566 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4567 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4568 | memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key)); |
| 4569 | } else { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4570 | key.objectid = ino; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4571 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
| 4572 | key.offset = 0; |
| 4573 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4574 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4575 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4576 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
| 4577 | key.objectid, root->root_key.objectid, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4578 | parent_ino, index, name, name_len); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4579 | } else if (add_backref) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4580 | ret = btrfs_insert_inode_ref(trans, root, name, name_len, ino, |
| 4581 | parent_ino, index); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4582 | } |
| 4583 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4584 | if (ret == 0) { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4585 | ret = btrfs_insert_dir_item(trans, root, name, name_len, |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 4586 | parent_inode, &key, |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4587 | btrfs_inode_type(inode), index); |
Chris Mason | fe66a05 | 2012-02-20 08:40:56 -0500 | [diff] [blame] | 4588 | if (ret) |
| 4589 | goto fail_dir_item; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 4590 | |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 4591 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4592 | name_len * 2); |
Chris Mason | 79c4458 | 2007-06-25 10:09:33 -0400 | [diff] [blame] | 4593 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4594 | ret = btrfs_update_inode(trans, root, parent_inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4595 | } |
| 4596 | return ret; |
Chris Mason | fe66a05 | 2012-02-20 08:40:56 -0500 | [diff] [blame] | 4597 | |
| 4598 | fail_dir_item: |
| 4599 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
| 4600 | u64 local_index; |
| 4601 | int err; |
| 4602 | err = btrfs_del_root_ref(trans, root->fs_info->tree_root, |
| 4603 | key.objectid, root->root_key.objectid, |
| 4604 | parent_ino, &local_index, name, name_len); |
| 4605 | |
| 4606 | } else if (add_backref) { |
| 4607 | u64 local_index; |
| 4608 | int err; |
| 4609 | |
| 4610 | err = btrfs_del_inode_ref(trans, root, name, name_len, |
| 4611 | ino, parent_ino, &local_index); |
| 4612 | } |
| 4613 | return ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4614 | } |
| 4615 | |
| 4616 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 4617 | struct inode *dir, struct dentry *dentry, |
| 4618 | struct inode *inode, int backref, u64 index) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4619 | { |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 4620 | int err = btrfs_add_link(trans, dir, inode, |
| 4621 | dentry->d_name.name, dentry->d_name.len, |
| 4622 | backref, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4623 | if (err > 0) |
| 4624 | err = -EEXIST; |
| 4625 | return err; |
| 4626 | } |
| 4627 | |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4628 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
Al Viro | 1a67aaf | 2011-07-26 01:52:52 -0400 | [diff] [blame] | 4629 | umode_t mode, dev_t rdev) |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4630 | { |
| 4631 | struct btrfs_trans_handle *trans; |
| 4632 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4633 | struct inode *inode = NULL; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4634 | int err; |
| 4635 | int drop_inode = 0; |
| 4636 | u64 objectid; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4637 | unsigned long nr = 0; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4638 | u64 index = 0; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4639 | |
| 4640 | if (!new_valid_dev(rdev)) |
| 4641 | return -EINVAL; |
| 4642 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4643 | /* |
| 4644 | * 2 for inode item and ref |
| 4645 | * 2 for dir items |
| 4646 | * 1 for xattr if selinux is on |
| 4647 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4648 | trans = btrfs_start_transaction(root, 5); |
| 4649 | if (IS_ERR(trans)) |
| 4650 | return PTR_ERR(trans); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4651 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 4652 | err = btrfs_find_free_ino(root, &objectid); |
| 4653 | if (err) |
| 4654 | goto out_unlock; |
| 4655 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4656 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4657 | dentry->d_name.len, btrfs_ino(dir), objectid, |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 4658 | mode, &index); |
Tsutomu Itoh | 7cf96da | 2011-04-25 19:43:53 -0400 | [diff] [blame] | 4659 | if (IS_ERR(inode)) { |
| 4660 | err = PTR_ERR(inode); |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4661 | goto out_unlock; |
Tsutomu Itoh | 7cf96da | 2011-04-25 19:43:53 -0400 | [diff] [blame] | 4662 | } |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4663 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 4664 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 4665 | if (err) { |
| 4666 | drop_inode = 1; |
| 4667 | goto out_unlock; |
| 4668 | } |
| 4669 | |
Casey Schaufler | ad19db7 | 2011-12-15 10:09:07 -0500 | [diff] [blame] | 4670 | /* |
| 4671 | * If the active LSM wants to access the inode during |
| 4672 | * d_instantiate it needs these. Smack checks to see |
| 4673 | * if the filesystem supports xattrs by looking at the |
| 4674 | * ops vector. |
| 4675 | */ |
| 4676 | |
| 4677 | inode->i_op = &btrfs_special_inode_operations; |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 4678 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4679 | if (err) |
| 4680 | drop_inode = 1; |
| 4681 | else { |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4682 | init_special_inode(inode, inode->i_mode, rdev); |
Yan | 1b4ab1b | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 4683 | btrfs_update_inode(trans, root, inode); |
Al Viro | 08c422c | 2011-12-23 07:58:13 -0500 | [diff] [blame] | 4684 | d_instantiate(dentry, inode); |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4685 | } |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4686 | out_unlock: |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 4687 | nr = trans->blocks_used; |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 4688 | btrfs_end_transaction(trans, root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4689 | btrfs_btree_balance_dirty(root, nr); |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4690 | if (drop_inode) { |
| 4691 | inode_dec_link_count(inode); |
| 4692 | iput(inode); |
| 4693 | } |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 4694 | return err; |
| 4695 | } |
| 4696 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4697 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
Al Viro | 4acdaf2 | 2011-07-26 01:42:34 -0400 | [diff] [blame] | 4698 | umode_t mode, struct nameidata *nd) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4699 | { |
| 4700 | struct btrfs_trans_handle *trans; |
| 4701 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4702 | struct inode *inode = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4703 | int drop_inode = 0; |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4704 | int err; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4705 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4706 | u64 objectid; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4707 | u64 index = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4708 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4709 | /* |
| 4710 | * 2 for inode item and ref |
| 4711 | * 2 for dir items |
| 4712 | * 1 for xattr if selinux is on |
| 4713 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4714 | trans = btrfs_start_transaction(root, 5); |
| 4715 | if (IS_ERR(trans)) |
| 4716 | return PTR_ERR(trans); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4717 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 4718 | err = btrfs_find_free_ino(root, &objectid); |
| 4719 | if (err) |
| 4720 | goto out_unlock; |
| 4721 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4722 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4723 | dentry->d_name.len, btrfs_ino(dir), objectid, |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 4724 | mode, &index); |
Tsutomu Itoh | 7cf96da | 2011-04-25 19:43:53 -0400 | [diff] [blame] | 4725 | if (IS_ERR(inode)) { |
| 4726 | err = PTR_ERR(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4727 | goto out_unlock; |
Tsutomu Itoh | 7cf96da | 2011-04-25 19:43:53 -0400 | [diff] [blame] | 4728 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4729 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 4730 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 4731 | if (err) { |
| 4732 | drop_inode = 1; |
| 4733 | goto out_unlock; |
| 4734 | } |
| 4735 | |
Casey Schaufler | ad19db7 | 2011-12-15 10:09:07 -0500 | [diff] [blame] | 4736 | /* |
| 4737 | * If the active LSM wants to access the inode during |
| 4738 | * d_instantiate it needs these. Smack checks to see |
| 4739 | * if the filesystem supports xattrs by looking at the |
| 4740 | * ops vector. |
| 4741 | */ |
| 4742 | inode->i_fop = &btrfs_file_operations; |
| 4743 | inode->i_op = &btrfs_file_inode_operations; |
| 4744 | |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 4745 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4746 | if (err) |
| 4747 | drop_inode = 1; |
| 4748 | else { |
| 4749 | inode->i_mapping->a_ops = &btrfs_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 4750 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4751 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
Al Viro | 08c422c | 2011-12-23 07:58:13 -0500 | [diff] [blame] | 4752 | d_instantiate(dentry, inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4753 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4754 | out_unlock: |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 4755 | nr = trans->blocks_used; |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 4756 | btrfs_end_transaction(trans, root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4757 | if (drop_inode) { |
| 4758 | inode_dec_link_count(inode); |
| 4759 | iput(inode); |
| 4760 | } |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 4761 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4762 | return err; |
| 4763 | } |
| 4764 | |
| 4765 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, |
| 4766 | struct dentry *dentry) |
| 4767 | { |
| 4768 | struct btrfs_trans_handle *trans; |
| 4769 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 4770 | struct inode *inode = old_dentry->d_inode; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4771 | u64 index; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4772 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4773 | int err; |
| 4774 | int drop_inode = 0; |
| 4775 | |
TARUISI Hiroaki | 4a8be42 | 2009-11-12 07:14:26 +0000 | [diff] [blame] | 4776 | /* do not allow sys_link's with other subvols of the same device */ |
| 4777 | if (root->objectid != BTRFS_I(inode)->root->objectid) |
Mark Fasheh | 3ab3564 | 2011-03-22 17:20:26 +0000 | [diff] [blame] | 4778 | return -EXDEV; |
TARUISI Hiroaki | 4a8be42 | 2009-11-12 07:14:26 +0000 | [diff] [blame] | 4779 | |
Al Viro | c055e99 | 2011-03-04 17:15:18 +0000 | [diff] [blame] | 4780 | if (inode->i_nlink == ~0U) |
| 4781 | return -EMLINK; |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4782 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4783 | err = btrfs_set_inode_index(dir, &index); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4784 | if (err) |
| 4785 | goto fail; |
| 4786 | |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4787 | /* |
Miao Xie | 7e6b646 | 2011-02-18 09:21:17 +0000 | [diff] [blame] | 4788 | * 2 items for inode and inode ref |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4789 | * 2 items for dir items |
Miao Xie | 7e6b646 | 2011-02-18 09:21:17 +0000 | [diff] [blame] | 4790 | * 1 item for parent inode |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4791 | */ |
Miao Xie | 7e6b646 | 2011-02-18 09:21:17 +0000 | [diff] [blame] | 4792 | trans = btrfs_start_transaction(root, 5); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4793 | if (IS_ERR(trans)) { |
| 4794 | err = PTR_ERR(trans); |
| 4795 | goto fail; |
| 4796 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4797 | |
Miao Xie | 3153495 | 2011-04-13 13:19:21 +0800 | [diff] [blame] | 4798 | btrfs_inc_nlink(inode); |
| 4799 | inode->i_ctime = CURRENT_TIME; |
Al Viro | 7de9c6e | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 4800 | ihold(inode); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4801 | |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 4802 | err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4803 | |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 4804 | if (err) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4805 | drop_inode = 1; |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 4806 | } else { |
Al Viro | 10d9f30 | 2011-07-16 23:09:10 -0400 | [diff] [blame] | 4807 | struct dentry *parent = dentry->d_parent; |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 4808 | err = btrfs_update_inode(trans, root, inode); |
| 4809 | BUG_ON(err); |
Al Viro | 08c422c | 2011-12-23 07:58:13 -0500 | [diff] [blame] | 4810 | d_instantiate(dentry, inode); |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 4811 | btrfs_log_new_name(trans, inode, NULL, parent); |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 4812 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4813 | |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 4814 | nr = trans->blocks_used; |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 4815 | btrfs_end_transaction(trans, root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4816 | fail: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4817 | if (drop_inode) { |
| 4818 | inode_dec_link_count(inode); |
| 4819 | iput(inode); |
| 4820 | } |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 4821 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4822 | return err; |
| 4823 | } |
| 4824 | |
Al Viro | 18bb1db | 2011-07-26 01:41:39 -0400 | [diff] [blame] | 4825 | 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] | 4826 | { |
Chris Mason | b9d8666 | 2008-05-02 16:13:49 -0400 | [diff] [blame] | 4827 | struct inode *inode = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4828 | struct btrfs_trans_handle *trans; |
| 4829 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 4830 | int err = 0; |
| 4831 | int drop_on_err = 0; |
Chris Mason | b9d8666 | 2008-05-02 16:13:49 -0400 | [diff] [blame] | 4832 | u64 objectid = 0; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4833 | u64 index = 0; |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 4834 | unsigned long nr = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4835 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 4836 | /* |
| 4837 | * 2 items for inode and ref |
| 4838 | * 2 items for dir items |
| 4839 | * 1 for xattr if selinux is on |
| 4840 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 4841 | trans = btrfs_start_transaction(root, 5); |
| 4842 | if (IS_ERR(trans)) |
| 4843 | return PTR_ERR(trans); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4844 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 4845 | err = btrfs_find_free_ino(root, &objectid); |
| 4846 | if (err) |
| 4847 | goto out_fail; |
| 4848 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4849 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4850 | dentry->d_name.len, btrfs_ino(dir), objectid, |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 4851 | S_IFDIR | mode, &index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4852 | if (IS_ERR(inode)) { |
| 4853 | err = PTR_ERR(inode); |
| 4854 | goto out_fail; |
| 4855 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4856 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4857 | drop_on_err = 1; |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 4858 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 4859 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 4860 | if (err) |
| 4861 | goto out_fail; |
| 4862 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4863 | inode->i_op = &btrfs_dir_inode_operations; |
| 4864 | inode->i_fop = &btrfs_dir_file_operations; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4865 | |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 4866 | btrfs_i_size_write(inode, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4867 | err = btrfs_update_inode(trans, root, inode); |
| 4868 | if (err) |
| 4869 | goto out_fail; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4870 | |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 4871 | err = btrfs_add_link(trans, dir, inode, dentry->d_name.name, |
| 4872 | dentry->d_name.len, 0, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4873 | if (err) |
| 4874 | goto out_fail; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4875 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4876 | d_instantiate(dentry, inode); |
| 4877 | drop_on_err = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4878 | |
| 4879 | out_fail: |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 4880 | nr = trans->blocks_used; |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 4881 | btrfs_end_transaction(trans, root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4882 | if (drop_on_err) |
| 4883 | iput(inode); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 4884 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4885 | return err; |
| 4886 | } |
| 4887 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4888 | /* helper for btfs_get_extent. Given an existing extent in the tree, |
| 4889 | * and an extent that you want to insert, deal with overlap and insert |
| 4890 | * the new extent into the tree. |
| 4891 | */ |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 4892 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
| 4893 | struct extent_map *existing, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4894 | struct extent_map *em, |
| 4895 | u64 map_start, u64 map_len) |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 4896 | { |
| 4897 | u64 start_diff; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 4898 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4899 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
| 4900 | start_diff = map_start - em->start; |
| 4901 | em->start = map_start; |
| 4902 | em->len = map_len; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4903 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
| 4904 | !test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4905 | em->block_start += start_diff; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4906 | em->block_len -= start_diff; |
| 4907 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4908 | return add_extent_mapping(em_tree, em); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 4909 | } |
| 4910 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4911 | static noinline int uncompress_inline(struct btrfs_path *path, |
| 4912 | struct inode *inode, struct page *page, |
| 4913 | size_t pg_offset, u64 extent_offset, |
| 4914 | struct btrfs_file_extent_item *item) |
| 4915 | { |
| 4916 | int ret; |
| 4917 | struct extent_buffer *leaf = path->nodes[0]; |
| 4918 | char *tmp; |
| 4919 | size_t max_size; |
| 4920 | unsigned long inline_size; |
| 4921 | unsigned long ptr; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 4922 | int compress_type; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4923 | |
| 4924 | WARN_ON(pg_offset != 0); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 4925 | compress_type = btrfs_file_extent_compression(leaf, item); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4926 | max_size = btrfs_file_extent_ram_bytes(leaf, item); |
| 4927 | inline_size = btrfs_file_extent_inline_item_len(leaf, |
| 4928 | btrfs_item_nr(leaf, path->slots[0])); |
| 4929 | tmp = kmalloc(inline_size, GFP_NOFS); |
Tsutomu Itoh | 8d41371 | 2011-04-25 19:43:52 -0400 | [diff] [blame] | 4930 | if (!tmp) |
| 4931 | return -ENOMEM; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4932 | ptr = btrfs_file_extent_inline_start(item); |
| 4933 | |
| 4934 | read_extent_buffer(leaf, tmp, ptr, inline_size); |
| 4935 | |
Chris Mason | 5b050f0 | 2008-11-11 09:34:41 -0500 | [diff] [blame] | 4936 | max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 4937 | ret = btrfs_decompress(compress_type, tmp, page, |
| 4938 | extent_offset, inline_size, max_size); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4939 | if (ret) { |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 4940 | char *kaddr = kmap_atomic(page); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4941 | unsigned long copy_size = min_t(u64, |
| 4942 | PAGE_CACHE_SIZE - pg_offset, |
| 4943 | max_size - extent_offset); |
| 4944 | memset(kaddr + pg_offset, 0, copy_size); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 4945 | kunmap_atomic(kaddr); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4946 | } |
| 4947 | kfree(tmp); |
| 4948 | return 0; |
| 4949 | } |
| 4950 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4951 | /* |
| 4952 | * 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] | 4953 | * the ugly parts come from merging extents from the disk with the in-ram |
| 4954 | * representation. This gets more complex because of the data=ordered code, |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4955 | * where the in-ram extents might be locked pending data=ordered completion. |
| 4956 | * |
| 4957 | * This also copies inline extents directly into the page. |
| 4958 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4959 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4960 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 4961 | size_t pg_offset, u64 start, u64 len, |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4962 | int create) |
| 4963 | { |
| 4964 | int ret; |
| 4965 | int err = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 4966 | u64 bytenr; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4967 | u64 extent_start = 0; |
| 4968 | u64 extent_end = 0; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 4969 | u64 objectid = btrfs_ino(inode); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4970 | u32 found_type; |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 4971 | struct btrfs_path *path = NULL; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4972 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4973 | struct btrfs_file_extent_item *item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4974 | struct extent_buffer *leaf; |
| 4975 | struct btrfs_key found_key; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4976 | struct extent_map *em = NULL; |
| 4977 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4978 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4979 | struct btrfs_trans_handle *trans = NULL; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 4980 | int compress_type; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4981 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4982 | again: |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 4983 | read_lock(&em_tree->lock); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4984 | em = lookup_extent_mapping(em_tree, start, len); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4985 | if (em) |
| 4986 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 4987 | read_unlock(&em_tree->lock); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4988 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4989 | if (em) { |
Chris Mason | e1c4b74 | 2008-04-22 13:26:46 -0400 | [diff] [blame] | 4990 | if (em->start > start || em->start + em->len <= start) |
| 4991 | free_extent_map(em); |
| 4992 | else if (em->block_start == EXTENT_MAP_INLINE && page) |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 4993 | free_extent_map(em); |
| 4994 | else |
| 4995 | goto out; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4996 | } |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 4997 | em = alloc_extent_map(); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4998 | if (!em) { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4999 | err = -ENOMEM; |
| 5000 | goto out; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5001 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5002 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5003 | em->start = EXTENT_MAP_HOLE; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 5004 | em->orig_start = EXTENT_MAP_HOLE; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5005 | em->len = (u64)-1; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5006 | em->block_len = (u64)-1; |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 5007 | |
| 5008 | if (!path) { |
| 5009 | path = btrfs_alloc_path(); |
Josef Bacik | 026fd31 | 2011-05-13 10:32:11 -0400 | [diff] [blame] | 5010 | if (!path) { |
| 5011 | err = -ENOMEM; |
| 5012 | goto out; |
| 5013 | } |
| 5014 | /* |
| 5015 | * Chances are we'll be called again, so go ahead and do |
| 5016 | * readahead |
| 5017 | */ |
| 5018 | path->reada = 1; |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 5019 | } |
| 5020 | |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5021 | ret = btrfs_lookup_file_extent(trans, root, path, |
| 5022 | objectid, start, trans != NULL); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5023 | if (ret < 0) { |
| 5024 | err = ret; |
| 5025 | goto out; |
| 5026 | } |
| 5027 | |
| 5028 | if (ret != 0) { |
| 5029 | if (path->slots[0] == 0) |
| 5030 | goto not_found; |
| 5031 | path->slots[0]--; |
| 5032 | } |
| 5033 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5034 | leaf = path->nodes[0]; |
| 5035 | item = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5036 | struct btrfs_file_extent_item); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5037 | /* are we inside the extent that was found? */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5038 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 5039 | found_type = btrfs_key_type(&found_key); |
| 5040 | if (found_key.objectid != objectid || |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5041 | found_type != BTRFS_EXTENT_DATA_KEY) { |
| 5042 | goto not_found; |
| 5043 | } |
| 5044 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5045 | found_type = btrfs_file_extent_type(leaf, item); |
| 5046 | extent_start = found_key.offset; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5047 | compress_type = btrfs_file_extent_compression(leaf, item); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5048 | if (found_type == BTRFS_FILE_EXTENT_REG || |
| 5049 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5050 | extent_end = extent_start + |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5051 | btrfs_file_extent_num_bytes(leaf, item); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5052 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
| 5053 | size_t size; |
| 5054 | size = btrfs_file_extent_inline_len(leaf, item); |
| 5055 | extent_end = (extent_start + size + root->sectorsize - 1) & |
| 5056 | ~((u64)root->sectorsize - 1); |
| 5057 | } |
| 5058 | |
| 5059 | if (start >= extent_end) { |
| 5060 | path->slots[0]++; |
| 5061 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 5062 | ret = btrfs_next_leaf(root, path); |
| 5063 | if (ret < 0) { |
| 5064 | err = ret; |
| 5065 | goto out; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5066 | } |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5067 | if (ret > 0) |
| 5068 | goto not_found; |
| 5069 | leaf = path->nodes[0]; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5070 | } |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5071 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 5072 | if (found_key.objectid != objectid || |
| 5073 | found_key.type != BTRFS_EXTENT_DATA_KEY) |
| 5074 | goto not_found; |
| 5075 | if (start + len <= found_key.offset) |
| 5076 | goto not_found; |
| 5077 | em->start = start; |
| 5078 | em->len = found_key.offset - start; |
| 5079 | goto not_found_em; |
| 5080 | } |
| 5081 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5082 | if (found_type == BTRFS_FILE_EXTENT_REG || |
| 5083 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5084 | em->start = extent_start; |
| 5085 | em->len = extent_end - extent_start; |
Yan Zheng | ff5b7ee | 2008-11-10 07:34:43 -0500 | [diff] [blame] | 5086 | em->orig_start = extent_start - |
| 5087 | btrfs_file_extent_offset(leaf, item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 5088 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
| 5089 | if (bytenr == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5090 | em->block_start = EXTENT_MAP_HOLE; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5091 | goto insert; |
| 5092 | } |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5093 | if (compress_type != BTRFS_COMPRESS_NONE) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5094 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5095 | em->compress_type = compress_type; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5096 | em->block_start = bytenr; |
| 5097 | em->block_len = btrfs_file_extent_disk_num_bytes(leaf, |
| 5098 | item); |
| 5099 | } else { |
| 5100 | bytenr += btrfs_file_extent_offset(leaf, item); |
| 5101 | em->block_start = bytenr; |
| 5102 | em->block_len = em->len; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5103 | if (found_type == BTRFS_FILE_EXTENT_PREALLOC) |
| 5104 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5105 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5106 | goto insert; |
| 5107 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5108 | unsigned long ptr; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5109 | char *map; |
Chris Mason | 3326d1b | 2007-10-15 16:18:25 -0400 | [diff] [blame] | 5110 | size_t size; |
| 5111 | size_t extent_offset; |
| 5112 | size_t copy_size; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5113 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5114 | em->block_start = EXTENT_MAP_INLINE; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5115 | if (!page || create) { |
Yan | 689f934 | 2007-10-29 11:41:07 -0400 | [diff] [blame] | 5116 | em->start = extent_start; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5117 | em->len = extent_end - extent_start; |
Yan | 689f934 | 2007-10-29 11:41:07 -0400 | [diff] [blame] | 5118 | goto out; |
| 5119 | } |
| 5120 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5121 | size = btrfs_file_extent_inline_len(leaf, item); |
| 5122 | extent_offset = page_offset(page) + pg_offset - extent_start; |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 5123 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, |
Yan | 689f934 | 2007-10-29 11:41:07 -0400 | [diff] [blame] | 5124 | size - extent_offset); |
Chris Mason | 3326d1b | 2007-10-15 16:18:25 -0400 | [diff] [blame] | 5125 | em->start = extent_start + extent_offset; |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 5126 | em->len = (copy_size + root->sectorsize - 1) & |
| 5127 | ~((u64)root->sectorsize - 1); |
Yan Zheng | ff5b7ee | 2008-11-10 07:34:43 -0500 | [diff] [blame] | 5128 | em->orig_start = EXTENT_MAP_INLINE; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5129 | if (compress_type) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5130 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5131 | em->compress_type = compress_type; |
| 5132 | } |
Yan | 689f934 | 2007-10-29 11:41:07 -0400 | [diff] [blame] | 5133 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5134 | if (create == 0 && !PageUptodate(page)) { |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 5135 | if (btrfs_file_extent_compression(leaf, item) != |
| 5136 | BTRFS_COMPRESS_NONE) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5137 | ret = uncompress_inline(path, inode, page, |
| 5138 | pg_offset, |
| 5139 | extent_offset, item); |
| 5140 | BUG_ON(ret); |
| 5141 | } else { |
| 5142 | map = kmap(page); |
| 5143 | read_extent_buffer(leaf, map + pg_offset, ptr, |
| 5144 | copy_size); |
Chris Mason | 93c82d5 | 2009-09-11 12:36:29 -0400 | [diff] [blame] | 5145 | if (pg_offset + copy_size < PAGE_CACHE_SIZE) { |
| 5146 | memset(map + pg_offset + copy_size, 0, |
| 5147 | PAGE_CACHE_SIZE - pg_offset - |
| 5148 | copy_size); |
| 5149 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5150 | kunmap(page); |
| 5151 | } |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5152 | flush_dcache_page(page); |
| 5153 | } else if (create && PageUptodate(page)) { |
Jan Schmidt | 6bf7e08 | 2011-12-01 14:35:19 +0100 | [diff] [blame] | 5154 | BUG(); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5155 | if (!trans) { |
| 5156 | kunmap(page); |
| 5157 | free_extent_map(em); |
| 5158 | em = NULL; |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 5159 | |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 5160 | btrfs_release_path(path); |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 5161 | trans = btrfs_join_transaction(root); |
Chris Mason | ff5714c | 2011-05-28 07:00:39 -0400 | [diff] [blame] | 5162 | |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 5163 | if (IS_ERR(trans)) |
| 5164 | return ERR_CAST(trans); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5165 | goto again; |
| 5166 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5167 | map = kmap(page); |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 5168 | write_extent_buffer(leaf, map + pg_offset, ptr, |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5169 | copy_size); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 5170 | kunmap(page); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 5171 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5172 | } |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5173 | set_extent_uptodate(io_tree, em->start, |
Arne Jansen | 507903b | 2011-04-06 10:02:20 +0000 | [diff] [blame] | 5174 | extent_map_end(em) - 1, NULL, GFP_NOFS); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5175 | goto insert; |
| 5176 | } else { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5177 | printk(KERN_ERR "btrfs unknown found_type %d\n", found_type); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5178 | WARN_ON(1); |
| 5179 | } |
| 5180 | not_found: |
| 5181 | em->start = start; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5182 | em->len = len; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5183 | not_found_em: |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5184 | em->block_start = EXTENT_MAP_HOLE; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 5185 | set_bit(EXTENT_FLAG_VACANCY, &em->flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5186 | insert: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 5187 | btrfs_release_path(path); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5188 | if (em->start > start || extent_map_end(em) <= start) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5189 | printk(KERN_ERR "Btrfs: bad extent! em: [%llu %llu] passed " |
| 5190 | "[%llu %llu]\n", (unsigned long long)em->start, |
| 5191 | (unsigned long long)em->len, |
| 5192 | (unsigned long long)start, |
| 5193 | (unsigned long long)len); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5194 | err = -EIO; |
| 5195 | goto out; |
| 5196 | } |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5197 | |
| 5198 | err = 0; |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 5199 | write_lock(&em_tree->lock); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5200 | ret = add_extent_mapping(em_tree, em); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5201 | /* it is possible that someone inserted the extent into the tree |
| 5202 | * while we had the lock dropped. It is also possible that |
| 5203 | * an overlapping map exists in the tree |
| 5204 | */ |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5205 | if (ret == -EEXIST) { |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5206 | struct extent_map *existing; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5207 | |
| 5208 | ret = 0; |
| 5209 | |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5210 | existing = lookup_extent_mapping(em_tree, start, len); |
Chris Mason | e1c4b74 | 2008-04-22 13:26:46 -0400 | [diff] [blame] | 5211 | if (existing && (existing->start > start || |
| 5212 | existing->start + existing->len <= start)) { |
| 5213 | free_extent_map(existing); |
| 5214 | existing = NULL; |
| 5215 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5216 | if (!existing) { |
| 5217 | existing = lookup_extent_mapping(em_tree, em->start, |
| 5218 | em->len); |
| 5219 | if (existing) { |
| 5220 | err = merge_extent_mapping(em_tree, existing, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5221 | em, start, |
| 5222 | root->sectorsize); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5223 | free_extent_map(existing); |
| 5224 | if (err) { |
| 5225 | free_extent_map(em); |
| 5226 | em = NULL; |
| 5227 | } |
| 5228 | } else { |
| 5229 | err = -EIO; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 5230 | free_extent_map(em); |
| 5231 | em = NULL; |
| 5232 | } |
| 5233 | } else { |
| 5234 | free_extent_map(em); |
| 5235 | em = existing; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5236 | err = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5237 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5238 | } |
Chris Mason | 890871b | 2009-09-02 16:24:52 -0400 | [diff] [blame] | 5239 | write_unlock(&em_tree->lock); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5240 | out: |
liubo | 1abe9b8 | 2011-03-24 11:18:59 +0000 | [diff] [blame] | 5241 | |
| 5242 | trace_btrfs_get_extent(root, em); |
| 5243 | |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 5244 | if (path) |
| 5245 | btrfs_free_path(path); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5246 | if (trans) { |
| 5247 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 5248 | if (!err) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5249 | err = ret; |
| 5250 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5251 | if (err) { |
| 5252 | free_extent_map(em); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5253 | return ERR_PTR(err); |
| 5254 | } |
| 5255 | return em; |
| 5256 | } |
| 5257 | |
Chris Mason | ec29ed5 | 2011-02-23 16:23:20 -0500 | [diff] [blame] | 5258 | struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page, |
| 5259 | size_t pg_offset, u64 start, u64 len, |
| 5260 | int create) |
| 5261 | { |
| 5262 | struct extent_map *em; |
| 5263 | struct extent_map *hole_em = NULL; |
| 5264 | u64 range_start = start; |
| 5265 | u64 end; |
| 5266 | u64 found; |
| 5267 | u64 found_end; |
| 5268 | int err = 0; |
| 5269 | |
| 5270 | em = btrfs_get_extent(inode, page, pg_offset, start, len, create); |
| 5271 | if (IS_ERR(em)) |
| 5272 | return em; |
| 5273 | if (em) { |
| 5274 | /* |
| 5275 | * if our em maps to a hole, there might |
| 5276 | * actually be delalloc bytes behind it |
| 5277 | */ |
| 5278 | if (em->block_start != EXTENT_MAP_HOLE) |
| 5279 | return em; |
| 5280 | else |
| 5281 | hole_em = em; |
| 5282 | } |
| 5283 | |
| 5284 | /* check to see if we've wrapped (len == -1 or similar) */ |
| 5285 | end = start + len; |
| 5286 | if (end < start) |
| 5287 | end = (u64)-1; |
| 5288 | else |
| 5289 | end -= 1; |
| 5290 | |
| 5291 | em = NULL; |
| 5292 | |
| 5293 | /* ok, we didn't find anything, lets look for delalloc */ |
| 5294 | found = count_range_bits(&BTRFS_I(inode)->io_tree, &range_start, |
| 5295 | end, len, EXTENT_DELALLOC, 1); |
| 5296 | found_end = range_start + found; |
| 5297 | if (found_end < range_start) |
| 5298 | found_end = (u64)-1; |
| 5299 | |
| 5300 | /* |
| 5301 | * we didn't find anything useful, return |
| 5302 | * the original results from get_extent() |
| 5303 | */ |
| 5304 | if (range_start > end || found_end <= start) { |
| 5305 | em = hole_em; |
| 5306 | hole_em = NULL; |
| 5307 | goto out; |
| 5308 | } |
| 5309 | |
| 5310 | /* adjust the range_start to make sure it doesn't |
| 5311 | * go backwards from the start they passed in |
| 5312 | */ |
| 5313 | range_start = max(start,range_start); |
| 5314 | found = found_end - range_start; |
| 5315 | |
| 5316 | if (found > 0) { |
| 5317 | u64 hole_start = start; |
| 5318 | u64 hole_len = len; |
| 5319 | |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 5320 | em = alloc_extent_map(); |
Chris Mason | ec29ed5 | 2011-02-23 16:23:20 -0500 | [diff] [blame] | 5321 | if (!em) { |
| 5322 | err = -ENOMEM; |
| 5323 | goto out; |
| 5324 | } |
| 5325 | /* |
| 5326 | * when btrfs_get_extent can't find anything it |
| 5327 | * returns one huge hole |
| 5328 | * |
| 5329 | * make sure what it found really fits our range, and |
| 5330 | * adjust to make sure it is based on the start from |
| 5331 | * the caller |
| 5332 | */ |
| 5333 | if (hole_em) { |
| 5334 | u64 calc_end = extent_map_end(hole_em); |
| 5335 | |
| 5336 | if (calc_end <= start || (hole_em->start > end)) { |
| 5337 | free_extent_map(hole_em); |
| 5338 | hole_em = NULL; |
| 5339 | } else { |
| 5340 | hole_start = max(hole_em->start, start); |
| 5341 | hole_len = calc_end - hole_start; |
| 5342 | } |
| 5343 | } |
| 5344 | em->bdev = NULL; |
| 5345 | if (hole_em && range_start > hole_start) { |
| 5346 | /* our hole starts before our delalloc, so we |
| 5347 | * have to return just the parts of the hole |
| 5348 | * that go until the delalloc starts |
| 5349 | */ |
| 5350 | em->len = min(hole_len, |
| 5351 | range_start - hole_start); |
| 5352 | em->start = hole_start; |
| 5353 | em->orig_start = hole_start; |
| 5354 | /* |
| 5355 | * don't adjust block start at all, |
| 5356 | * it is fixed at EXTENT_MAP_HOLE |
| 5357 | */ |
| 5358 | em->block_start = hole_em->block_start; |
| 5359 | em->block_len = hole_len; |
| 5360 | } else { |
| 5361 | em->start = range_start; |
| 5362 | em->len = found; |
| 5363 | em->orig_start = range_start; |
| 5364 | em->block_start = EXTENT_MAP_DELALLOC; |
| 5365 | em->block_len = found; |
| 5366 | } |
| 5367 | } else if (hole_em) { |
| 5368 | return hole_em; |
| 5369 | } |
| 5370 | out: |
| 5371 | |
| 5372 | free_extent_map(hole_em); |
| 5373 | if (err) { |
| 5374 | free_extent_map(em); |
| 5375 | return ERR_PTR(err); |
| 5376 | } |
| 5377 | return em; |
| 5378 | } |
| 5379 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5380 | static struct extent_map *btrfs_new_extent_direct(struct inode *inode, |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5381 | struct extent_map *em, |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5382 | u64 start, u64 len) |
| 5383 | { |
| 5384 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5385 | struct btrfs_trans_handle *trans; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5386 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 5387 | struct btrfs_key ins; |
| 5388 | u64 alloc_hint; |
| 5389 | int ret; |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5390 | bool insert = false; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5391 | |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5392 | /* |
| 5393 | * Ok if the extent map we looked up is a hole and is for the exact |
| 5394 | * range we want, there is no reason to allocate a new one, however if |
| 5395 | * it is not right then we need to free this one and drop the cache for |
| 5396 | * our range. |
| 5397 | */ |
| 5398 | if (em->block_start != EXTENT_MAP_HOLE || em->start != start || |
| 5399 | em->len != len) { |
| 5400 | free_extent_map(em); |
| 5401 | em = NULL; |
| 5402 | insert = true; |
| 5403 | btrfs_drop_extent_cache(inode, start, start + len - 1, 0); |
| 5404 | } |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5405 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 5406 | trans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 5407 | if (IS_ERR(trans)) |
| 5408 | return ERR_CAST(trans); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5409 | |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 5410 | if (start <= BTRFS_I(inode)->disk_i_size && len < 64 * 1024) |
| 5411 | btrfs_add_inode_defrag(trans, inode); |
| 5412 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5413 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
| 5414 | |
| 5415 | alloc_hint = get_extent_allocation_hint(inode, start, len); |
| 5416 | ret = btrfs_reserve_extent(trans, root, len, root->sectorsize, 0, |
| 5417 | alloc_hint, (u64)-1, &ins, 1); |
| 5418 | if (ret) { |
| 5419 | em = ERR_PTR(ret); |
| 5420 | goto out; |
| 5421 | } |
| 5422 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5423 | if (!em) { |
David Sterba | 172ddd6 | 2011-04-21 00:48:27 +0200 | [diff] [blame] | 5424 | em = alloc_extent_map(); |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5425 | if (!em) { |
| 5426 | em = ERR_PTR(-ENOMEM); |
| 5427 | goto out; |
| 5428 | } |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5429 | } |
| 5430 | |
| 5431 | em->start = start; |
| 5432 | em->orig_start = em->start; |
| 5433 | em->len = ins.offset; |
| 5434 | |
| 5435 | em->block_start = ins.objectid; |
| 5436 | em->block_len = ins.offset; |
| 5437 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5438 | |
| 5439 | /* |
| 5440 | * We need to do this because if we're using the original em we searched |
| 5441 | * for, we could have EXTENT_FLAG_VACANCY set, and we don't want that. |
| 5442 | */ |
| 5443 | em->flags = 0; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5444 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
| 5445 | |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5446 | while (insert) { |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5447 | write_lock(&em_tree->lock); |
| 5448 | ret = add_extent_mapping(em_tree, em); |
| 5449 | write_unlock(&em_tree->lock); |
| 5450 | if (ret != -EEXIST) |
| 5451 | break; |
| 5452 | btrfs_drop_extent_cache(inode, start, start + em->len - 1, 0); |
| 5453 | } |
| 5454 | |
| 5455 | ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid, |
| 5456 | ins.offset, ins.offset, 0); |
| 5457 | if (ret) { |
| 5458 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset); |
| 5459 | em = ERR_PTR(ret); |
| 5460 | } |
| 5461 | out: |
| 5462 | btrfs_end_transaction(trans, root); |
| 5463 | return em; |
| 5464 | } |
| 5465 | |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5466 | /* |
| 5467 | * returns 1 when the nocow is safe, < 1 on error, 0 if the |
| 5468 | * block must be cow'd |
| 5469 | */ |
| 5470 | static noinline int can_nocow_odirect(struct btrfs_trans_handle *trans, |
| 5471 | struct inode *inode, u64 offset, u64 len) |
| 5472 | { |
| 5473 | struct btrfs_path *path; |
| 5474 | int ret; |
| 5475 | struct extent_buffer *leaf; |
| 5476 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5477 | struct btrfs_file_extent_item *fi; |
| 5478 | struct btrfs_key key; |
| 5479 | u64 disk_bytenr; |
| 5480 | u64 backref_offset; |
| 5481 | u64 extent_end; |
| 5482 | u64 num_bytes; |
| 5483 | int slot; |
| 5484 | int found_type; |
| 5485 | |
| 5486 | path = btrfs_alloc_path(); |
| 5487 | if (!path) |
| 5488 | return -ENOMEM; |
| 5489 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 5490 | ret = btrfs_lookup_file_extent(trans, root, path, btrfs_ino(inode), |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5491 | offset, 0); |
| 5492 | if (ret < 0) |
| 5493 | goto out; |
| 5494 | |
| 5495 | slot = path->slots[0]; |
| 5496 | if (ret == 1) { |
| 5497 | if (slot == 0) { |
| 5498 | /* can't find the item, must cow */ |
| 5499 | ret = 0; |
| 5500 | goto out; |
| 5501 | } |
| 5502 | slot--; |
| 5503 | } |
| 5504 | ret = 0; |
| 5505 | leaf = path->nodes[0]; |
| 5506 | btrfs_item_key_to_cpu(leaf, &key, slot); |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 5507 | if (key.objectid != btrfs_ino(inode) || |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5508 | key.type != BTRFS_EXTENT_DATA_KEY) { |
| 5509 | /* not our file or wrong item type, must cow */ |
| 5510 | goto out; |
| 5511 | } |
| 5512 | |
| 5513 | if (key.offset > offset) { |
| 5514 | /* Wrong offset, must cow */ |
| 5515 | goto out; |
| 5516 | } |
| 5517 | |
| 5518 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); |
| 5519 | found_type = btrfs_file_extent_type(leaf, fi); |
| 5520 | if (found_type != BTRFS_FILE_EXTENT_REG && |
| 5521 | found_type != BTRFS_FILE_EXTENT_PREALLOC) { |
| 5522 | /* not a regular extent, must cow */ |
| 5523 | goto out; |
| 5524 | } |
| 5525 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
| 5526 | backref_offset = btrfs_file_extent_offset(leaf, fi); |
| 5527 | |
| 5528 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); |
| 5529 | if (extent_end < offset + len) { |
| 5530 | /* extent doesn't include our full range, must cow */ |
| 5531 | goto out; |
| 5532 | } |
| 5533 | |
| 5534 | if (btrfs_extent_readonly(root, disk_bytenr)) |
| 5535 | goto out; |
| 5536 | |
| 5537 | /* |
| 5538 | * look for other files referencing this extent, if we |
| 5539 | * find any we must cow |
| 5540 | */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 5541 | if (btrfs_cross_ref_exist(trans, root, btrfs_ino(inode), |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5542 | key.offset - backref_offset, disk_bytenr)) |
| 5543 | goto out; |
| 5544 | |
| 5545 | /* |
| 5546 | * adjust disk_bytenr and num_bytes to cover just the bytes |
| 5547 | * in this extent we are about to write. If there |
| 5548 | * are any csums in that range we have to cow in order |
| 5549 | * to keep the csums correct |
| 5550 | */ |
| 5551 | disk_bytenr += backref_offset; |
| 5552 | disk_bytenr += offset - key.offset; |
| 5553 | num_bytes = min(offset + len, extent_end) - offset; |
| 5554 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) |
| 5555 | goto out; |
| 5556 | /* |
| 5557 | * all of the above have passed, it is safe to overwrite this extent |
| 5558 | * without cow |
| 5559 | */ |
| 5560 | ret = 1; |
| 5561 | out: |
| 5562 | btrfs_free_path(path); |
| 5563 | return ret; |
| 5564 | } |
| 5565 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5566 | static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, |
| 5567 | struct buffer_head *bh_result, int create) |
| 5568 | { |
| 5569 | struct extent_map *em; |
| 5570 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5571 | u64 start = iblock << inode->i_blkbits; |
| 5572 | u64 len = bh_result->b_size; |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5573 | struct btrfs_trans_handle *trans; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5574 | |
| 5575 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); |
| 5576 | if (IS_ERR(em)) |
| 5577 | return PTR_ERR(em); |
| 5578 | |
| 5579 | /* |
| 5580 | * Ok for INLINE and COMPRESSED extents we need to fallback on buffered |
| 5581 | * io. INLINE is special, and we could probably kludge it in here, but |
| 5582 | * it's still buffered so for safety lets just fall back to the generic |
| 5583 | * buffered path. |
| 5584 | * |
| 5585 | * For COMPRESSED we _have_ to read the entire extent in so we can |
| 5586 | * decompress it, so there will be buffering required no matter what we |
| 5587 | * do, so go ahead and fallback to buffered. |
| 5588 | * |
| 5589 | * We return -ENOTBLK because thats what makes DIO go ahead and go back |
| 5590 | * to buffered IO. Don't blame me, this is the price we pay for using |
| 5591 | * the generic code. |
| 5592 | */ |
| 5593 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) || |
| 5594 | em->block_start == EXTENT_MAP_INLINE) { |
| 5595 | free_extent_map(em); |
| 5596 | return -ENOTBLK; |
| 5597 | } |
| 5598 | |
| 5599 | /* Just a good old fashioned hole, return */ |
| 5600 | if (!create && (em->block_start == EXTENT_MAP_HOLE || |
| 5601 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { |
| 5602 | free_extent_map(em); |
| 5603 | /* DIO will do one hole at a time, so just unlock a sector */ |
| 5604 | unlock_extent(&BTRFS_I(inode)->io_tree, start, |
| 5605 | start + root->sectorsize - 1, GFP_NOFS); |
| 5606 | return 0; |
| 5607 | } |
| 5608 | |
| 5609 | /* |
| 5610 | * We don't allocate a new extent in the following cases |
| 5611 | * |
| 5612 | * 1) The inode is marked as NODATACOW. In this case we'll just use the |
| 5613 | * existing extent. |
| 5614 | * 2) The extent is marked as PREALLOC. We're good to go here and can |
| 5615 | * just use the extent. |
| 5616 | * |
| 5617 | */ |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5618 | if (!create) { |
| 5619 | len = em->len - (start - em->start); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5620 | goto map; |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5621 | } |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5622 | |
| 5623 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) || |
| 5624 | ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) && |
| 5625 | em->block_start != EXTENT_MAP_HOLE)) { |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5626 | int type; |
| 5627 | int ret; |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5628 | u64 block_start; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5629 | |
| 5630 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
| 5631 | type = BTRFS_ORDERED_PREALLOC; |
| 5632 | else |
| 5633 | type = BTRFS_ORDERED_NOCOW; |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5634 | len = min(len, em->len - (start - em->start)); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5635 | block_start = em->block_start + (start - em->start); |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5636 | |
| 5637 | /* |
| 5638 | * we're not going to log anything, but we do need |
| 5639 | * to make sure the current transaction stays open |
| 5640 | * while we look for nocow cross refs |
| 5641 | */ |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 5642 | trans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 5643 | if (IS_ERR(trans)) |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5644 | goto must_cow; |
| 5645 | |
| 5646 | if (can_nocow_odirect(trans, inode, start, len) == 1) { |
| 5647 | ret = btrfs_add_ordered_extent_dio(inode, start, |
| 5648 | block_start, len, len, type); |
| 5649 | btrfs_end_transaction(trans, root); |
| 5650 | if (ret) { |
| 5651 | free_extent_map(em); |
| 5652 | return ret; |
| 5653 | } |
| 5654 | goto unlock; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5655 | } |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5656 | btrfs_end_transaction(trans, root); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5657 | } |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5658 | must_cow: |
| 5659 | /* |
| 5660 | * this will cow the extent, reset the len in case we changed |
| 5661 | * it above |
| 5662 | */ |
| 5663 | len = bh_result->b_size; |
Josef Bacik | 16d299a | 2011-04-06 14:53:07 -0400 | [diff] [blame] | 5664 | em = btrfs_new_extent_direct(inode, em, start, len); |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5665 | if (IS_ERR(em)) |
| 5666 | return PTR_ERR(em); |
| 5667 | len = min(len, em->len - (start - em->start)); |
| 5668 | unlock: |
Chris Mason | 4845e44 | 2010-05-25 20:56:50 -0400 | [diff] [blame] | 5669 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
| 5670 | EXTENT_LOCKED | EXTENT_DELALLOC | EXTENT_DIRTY, 1, |
| 5671 | 0, NULL, GFP_NOFS); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5672 | map: |
| 5673 | bh_result->b_blocknr = (em->block_start + (start - em->start)) >> |
| 5674 | inode->i_blkbits; |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 5675 | bh_result->b_size = len; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5676 | bh_result->b_bdev = em->bdev; |
| 5677 | set_buffer_mapped(bh_result); |
| 5678 | if (create && !test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
| 5679 | set_buffer_new(bh_result); |
| 5680 | |
| 5681 | free_extent_map(em); |
| 5682 | |
| 5683 | return 0; |
| 5684 | } |
| 5685 | |
| 5686 | struct btrfs_dio_private { |
| 5687 | struct inode *inode; |
| 5688 | u64 logical_offset; |
| 5689 | u64 disk_bytenr; |
| 5690 | u64 bytes; |
| 5691 | u32 *csums; |
| 5692 | void *private; |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5693 | |
| 5694 | /* number of bios pending for this dio */ |
| 5695 | atomic_t pending_bios; |
| 5696 | |
| 5697 | /* IO errors */ |
| 5698 | int errors; |
| 5699 | |
| 5700 | struct bio *orig_bio; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5701 | }; |
| 5702 | |
| 5703 | static void btrfs_endio_direct_read(struct bio *bio, int err) |
| 5704 | { |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5705 | struct btrfs_dio_private *dip = bio->bi_private; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5706 | struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1; |
| 5707 | struct bio_vec *bvec = bio->bi_io_vec; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5708 | struct inode *inode = dip->inode; |
| 5709 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5710 | u64 start; |
| 5711 | u32 *private = dip->csums; |
| 5712 | |
| 5713 | start = dip->logical_offset; |
| 5714 | do { |
| 5715 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) { |
| 5716 | struct page *page = bvec->bv_page; |
| 5717 | char *kaddr; |
| 5718 | u32 csum = ~(u32)0; |
| 5719 | unsigned long flags; |
| 5720 | |
| 5721 | local_irq_save(flags); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 5722 | kaddr = kmap_atomic(page); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5723 | csum = btrfs_csum_data(root, kaddr + bvec->bv_offset, |
| 5724 | csum, bvec->bv_len); |
| 5725 | btrfs_csum_final(csum, (char *)&csum); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 5726 | kunmap_atomic(kaddr); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5727 | local_irq_restore(flags); |
| 5728 | |
| 5729 | flush_dcache_page(bvec->bv_page); |
| 5730 | if (csum != *private) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 5731 | printk(KERN_ERR "btrfs csum failed ino %llu off" |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5732 | " %llu csum %u private %u\n", |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 5733 | (unsigned long long)btrfs_ino(inode), |
| 5734 | (unsigned long long)start, |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5735 | csum, *private); |
| 5736 | err = -EIO; |
| 5737 | } |
| 5738 | } |
| 5739 | |
| 5740 | start += bvec->bv_len; |
| 5741 | private++; |
| 5742 | bvec++; |
| 5743 | } while (bvec <= bvec_end); |
| 5744 | |
| 5745 | unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset, |
| 5746 | dip->logical_offset + dip->bytes - 1, GFP_NOFS); |
| 5747 | bio->bi_private = dip->private; |
| 5748 | |
| 5749 | kfree(dip->csums); |
| 5750 | kfree(dip); |
Josef Bacik | c0da7aa | 2011-03-22 11:05:07 -0400 | [diff] [blame] | 5751 | |
| 5752 | /* If we had a csum failure make sure to clear the uptodate flag */ |
| 5753 | if (err) |
| 5754 | clear_bit(BIO_UPTODATE, &bio->bi_flags); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5755 | dio_end_io(bio, err); |
| 5756 | } |
| 5757 | |
| 5758 | static void btrfs_endio_direct_write(struct bio *bio, int err) |
| 5759 | { |
| 5760 | struct btrfs_dio_private *dip = bio->bi_private; |
| 5761 | struct inode *inode = dip->inode; |
| 5762 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5763 | struct btrfs_trans_handle *trans; |
| 5764 | struct btrfs_ordered_extent *ordered = NULL; |
| 5765 | struct extent_state *cached_state = NULL; |
Chris Mason | 163cf09 | 2010-11-28 19:56:33 -0500 | [diff] [blame] | 5766 | u64 ordered_offset = dip->logical_offset; |
| 5767 | u64 ordered_bytes = dip->bytes; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5768 | int ret; |
| 5769 | |
| 5770 | if (err) |
| 5771 | goto out_done; |
Chris Mason | 163cf09 | 2010-11-28 19:56:33 -0500 | [diff] [blame] | 5772 | again: |
| 5773 | ret = btrfs_dec_test_first_ordered_pending(inode, &ordered, |
| 5774 | &ordered_offset, |
| 5775 | ordered_bytes); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5776 | if (!ret) |
Chris Mason | 163cf09 | 2010-11-28 19:56:33 -0500 | [diff] [blame] | 5777 | goto out_test; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5778 | |
| 5779 | BUG_ON(!ordered); |
| 5780 | |
Josef Bacik | 7a7eaa4 | 2011-04-13 12:54:33 -0400 | [diff] [blame] | 5781 | trans = btrfs_join_transaction(root); |
Tsutomu Itoh | 3612b49 | 2011-01-25 02:51:38 +0000 | [diff] [blame] | 5782 | if (IS_ERR(trans)) { |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5783 | err = -ENOMEM; |
| 5784 | goto out; |
| 5785 | } |
| 5786 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
| 5787 | |
| 5788 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags)) { |
| 5789 | ret = btrfs_ordered_update_i_size(inode, 0, ordered); |
| 5790 | if (!ret) |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 5791 | err = btrfs_update_inode_fallback(trans, root, inode); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5792 | goto out; |
| 5793 | } |
| 5794 | |
| 5795 | lock_extent_bits(&BTRFS_I(inode)->io_tree, ordered->file_offset, |
| 5796 | ordered->file_offset + ordered->len - 1, 0, |
| 5797 | &cached_state, GFP_NOFS); |
| 5798 | |
| 5799 | if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags)) { |
| 5800 | ret = btrfs_mark_extent_written(trans, inode, |
| 5801 | ordered->file_offset, |
| 5802 | ordered->file_offset + |
| 5803 | ordered->len); |
| 5804 | if (ret) { |
| 5805 | err = ret; |
| 5806 | goto out_unlock; |
| 5807 | } |
| 5808 | } else { |
| 5809 | ret = insert_reserved_file_extent(trans, inode, |
| 5810 | ordered->file_offset, |
| 5811 | ordered->start, |
| 5812 | ordered->disk_len, |
| 5813 | ordered->len, |
| 5814 | ordered->len, |
| 5815 | 0, 0, 0, |
| 5816 | BTRFS_FILE_EXTENT_REG); |
| 5817 | unpin_extent_cache(&BTRFS_I(inode)->extent_tree, |
| 5818 | ordered->file_offset, ordered->len); |
| 5819 | if (ret) { |
| 5820 | err = ret; |
| 5821 | WARN_ON(1); |
| 5822 | goto out_unlock; |
| 5823 | } |
| 5824 | } |
| 5825 | |
| 5826 | add_pending_csums(trans, inode, ordered->file_offset, &ordered->list); |
Josef Bacik | 1ef30be | 2011-04-05 19:25:36 -0400 | [diff] [blame] | 5827 | ret = btrfs_ordered_update_i_size(inode, 0, ordered); |
Miao Xie | a39f752 | 2011-09-11 10:52:25 -0400 | [diff] [blame] | 5828 | if (!ret || !test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags)) |
Chris Mason | 2115133 | 2011-11-10 20:39:08 -0500 | [diff] [blame] | 5829 | btrfs_update_inode_fallback(trans, root, inode); |
Josef Bacik | 1ef30be | 2011-04-05 19:25:36 -0400 | [diff] [blame] | 5830 | ret = 0; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5831 | out_unlock: |
| 5832 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, ordered->file_offset, |
| 5833 | ordered->file_offset + ordered->len - 1, |
| 5834 | &cached_state, GFP_NOFS); |
| 5835 | out: |
| 5836 | btrfs_delalloc_release_metadata(inode, ordered->len); |
| 5837 | btrfs_end_transaction(trans, root); |
Chris Mason | 163cf09 | 2010-11-28 19:56:33 -0500 | [diff] [blame] | 5838 | ordered_offset = ordered->file_offset + ordered->len; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5839 | btrfs_put_ordered_extent(ordered); |
| 5840 | btrfs_put_ordered_extent(ordered); |
Chris Mason | 163cf09 | 2010-11-28 19:56:33 -0500 | [diff] [blame] | 5841 | |
| 5842 | out_test: |
| 5843 | /* |
| 5844 | * our bio might span multiple ordered extents. If we haven't |
| 5845 | * completed the accounting for the whole dio, go back and try again |
| 5846 | */ |
| 5847 | if (ordered_offset < dip->logical_offset + dip->bytes) { |
| 5848 | ordered_bytes = dip->logical_offset + dip->bytes - |
| 5849 | ordered_offset; |
| 5850 | goto again; |
| 5851 | } |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5852 | out_done: |
| 5853 | bio->bi_private = dip->private; |
| 5854 | |
| 5855 | kfree(dip->csums); |
| 5856 | kfree(dip); |
Josef Bacik | c0da7aa | 2011-03-22 11:05:07 -0400 | [diff] [blame] | 5857 | |
| 5858 | /* If we had an error make sure to clear the uptodate flag */ |
| 5859 | if (err) |
| 5860 | clear_bit(BIO_UPTODATE, &bio->bi_flags); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 5861 | dio_end_io(bio, err); |
| 5862 | } |
| 5863 | |
Chris Mason | eaf25d9 | 2010-05-25 09:48:28 -0400 | [diff] [blame] | 5864 | static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw, |
| 5865 | struct bio *bio, int mirror_num, |
| 5866 | unsigned long bio_flags, u64 offset) |
| 5867 | { |
| 5868 | int ret; |
| 5869 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5870 | ret = btrfs_csum_one_bio(root, inode, bio, offset, 1); |
| 5871 | BUG_ON(ret); |
| 5872 | return 0; |
| 5873 | } |
| 5874 | |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5875 | static void btrfs_end_dio_bio(struct bio *bio, int err) |
| 5876 | { |
| 5877 | struct btrfs_dio_private *dip = bio->bi_private; |
| 5878 | |
| 5879 | if (err) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 5880 | printk(KERN_ERR "btrfs direct IO failed ino %llu rw %lu " |
Jan Beulich | 3dd1462 | 2010-12-07 14:54:09 +0000 | [diff] [blame] | 5881 | "sector %#Lx len %u err no %d\n", |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 5882 | (unsigned long long)btrfs_ino(dip->inode), bio->bi_rw, |
Jan Beulich | 3dd1462 | 2010-12-07 14:54:09 +0000 | [diff] [blame] | 5883 | (unsigned long long)bio->bi_sector, bio->bi_size, err); |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5884 | dip->errors = 1; |
| 5885 | |
| 5886 | /* |
| 5887 | * before atomic variable goto zero, we must make sure |
| 5888 | * dip->errors is perceived to be set. |
| 5889 | */ |
| 5890 | smp_mb__before_atomic_dec(); |
| 5891 | } |
| 5892 | |
| 5893 | /* if there are more bios still pending for this dio, just exit */ |
| 5894 | if (!atomic_dec_and_test(&dip->pending_bios)) |
| 5895 | goto out; |
| 5896 | |
| 5897 | if (dip->errors) |
| 5898 | bio_io_error(dip->orig_bio); |
| 5899 | else { |
| 5900 | set_bit(BIO_UPTODATE, &dip->orig_bio->bi_flags); |
| 5901 | bio_endio(dip->orig_bio, 0); |
| 5902 | } |
| 5903 | out: |
| 5904 | bio_put(bio); |
| 5905 | } |
| 5906 | |
| 5907 | static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev, |
| 5908 | u64 first_sector, gfp_t gfp_flags) |
| 5909 | { |
| 5910 | int nr_vecs = bio_get_nr_vecs(bdev); |
| 5911 | return btrfs_bio_alloc(bdev, first_sector, nr_vecs, gfp_flags); |
| 5912 | } |
| 5913 | |
| 5914 | static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, |
| 5915 | int rw, u64 file_offset, int skip_sum, |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 5916 | u32 *csums, int async_submit) |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5917 | { |
| 5918 | int write = rw & REQ_WRITE; |
| 5919 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5920 | int ret; |
| 5921 | |
| 5922 | bio_get(bio); |
| 5923 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); |
| 5924 | if (ret) |
| 5925 | goto err; |
| 5926 | |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 5927 | if (skip_sum) |
| 5928 | goto map; |
| 5929 | |
| 5930 | if (write && async_submit) { |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5931 | ret = btrfs_wq_submit_bio(root->fs_info, |
| 5932 | inode, rw, bio, 0, 0, |
| 5933 | file_offset, |
| 5934 | __btrfs_submit_bio_start_direct_io, |
| 5935 | __btrfs_submit_bio_done); |
| 5936 | goto err; |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 5937 | } else if (write) { |
| 5938 | /* |
| 5939 | * If we aren't doing async submit, calculate the csum of the |
| 5940 | * bio now. |
| 5941 | */ |
| 5942 | ret = btrfs_csum_one_bio(root, inode, bio, file_offset, 1); |
| 5943 | if (ret) |
| 5944 | goto err; |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 5945 | } else if (!skip_sum) { |
| 5946 | ret = btrfs_lookup_bio_sums_dio(root, inode, bio, |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5947 | file_offset, csums); |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 5948 | if (ret) |
| 5949 | goto err; |
| 5950 | } |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5951 | |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 5952 | map: |
| 5953 | ret = btrfs_map_bio(root, rw, bio, 0, async_submit); |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5954 | err: |
| 5955 | bio_put(bio); |
| 5956 | return ret; |
| 5957 | } |
| 5958 | |
| 5959 | static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip, |
| 5960 | int skip_sum) |
| 5961 | { |
| 5962 | struct inode *inode = dip->inode; |
| 5963 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5964 | struct btrfs_mapping_tree *map_tree = &root->fs_info->mapping_tree; |
| 5965 | struct bio *bio; |
| 5966 | struct bio *orig_bio = dip->orig_bio; |
| 5967 | struct bio_vec *bvec = orig_bio->bi_io_vec; |
| 5968 | u64 start_sector = orig_bio->bi_sector; |
| 5969 | u64 file_offset = dip->logical_offset; |
| 5970 | u64 submit_len = 0; |
| 5971 | u64 map_length; |
| 5972 | int nr_pages = 0; |
| 5973 | u32 *csums = dip->csums; |
| 5974 | int ret = 0; |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 5975 | int async_submit = 0; |
Josef Bacik | 98bc314 | 2011-03-22 11:00:46 -0400 | [diff] [blame] | 5976 | int write = rw & REQ_WRITE; |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5977 | |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5978 | map_length = orig_bio->bi_size; |
| 5979 | ret = btrfs_map_block(map_tree, READ, start_sector << 9, |
| 5980 | &map_length, NULL, 0); |
| 5981 | if (ret) { |
Josef Bacik | 64728bb | 2011-04-25 19:43:52 -0400 | [diff] [blame] | 5982 | bio_put(orig_bio); |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5983 | return -EIO; |
| 5984 | } |
| 5985 | |
Josef Bacik | 02f57c7 | 2011-04-06 14:25:44 -0400 | [diff] [blame] | 5986 | if (map_length >= orig_bio->bi_size) { |
| 5987 | bio = orig_bio; |
| 5988 | goto submit; |
| 5989 | } |
| 5990 | |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 5991 | async_submit = 1; |
Josef Bacik | 02f57c7 | 2011-04-06 14:25:44 -0400 | [diff] [blame] | 5992 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS); |
| 5993 | if (!bio) |
| 5994 | return -ENOMEM; |
| 5995 | bio->bi_private = dip; |
| 5996 | bio->bi_end_io = btrfs_end_dio_bio; |
| 5997 | atomic_inc(&dip->pending_bios); |
| 5998 | |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 5999 | while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) { |
| 6000 | if (unlikely(map_length < submit_len + bvec->bv_len || |
| 6001 | bio_add_page(bio, bvec->bv_page, bvec->bv_len, |
| 6002 | bvec->bv_offset) < bvec->bv_len)) { |
| 6003 | /* |
| 6004 | * inc the count before we submit the bio so |
| 6005 | * we know the end IO handler won't happen before |
| 6006 | * we inc the count. Otherwise, the dip might get freed |
| 6007 | * before we're done setting it up |
| 6008 | */ |
| 6009 | atomic_inc(&dip->pending_bios); |
| 6010 | ret = __btrfs_submit_dio_bio(bio, inode, rw, |
| 6011 | file_offset, skip_sum, |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 6012 | csums, async_submit); |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6013 | if (ret) { |
| 6014 | bio_put(bio); |
| 6015 | atomic_dec(&dip->pending_bios); |
| 6016 | goto out_err; |
| 6017 | } |
| 6018 | |
Josef Bacik | 98bc314 | 2011-03-22 11:00:46 -0400 | [diff] [blame] | 6019 | /* Write's use the ordered csums */ |
| 6020 | if (!write && !skip_sum) |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6021 | csums = csums + nr_pages; |
| 6022 | start_sector += submit_len >> 9; |
| 6023 | file_offset += submit_len; |
| 6024 | |
| 6025 | submit_len = 0; |
| 6026 | nr_pages = 0; |
| 6027 | |
| 6028 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, |
| 6029 | start_sector, GFP_NOFS); |
| 6030 | if (!bio) |
| 6031 | goto out_err; |
| 6032 | bio->bi_private = dip; |
| 6033 | bio->bi_end_io = btrfs_end_dio_bio; |
| 6034 | |
| 6035 | map_length = orig_bio->bi_size; |
| 6036 | ret = btrfs_map_block(map_tree, READ, start_sector << 9, |
| 6037 | &map_length, NULL, 0); |
| 6038 | if (ret) { |
| 6039 | bio_put(bio); |
| 6040 | goto out_err; |
| 6041 | } |
| 6042 | } else { |
| 6043 | submit_len += bvec->bv_len; |
| 6044 | nr_pages ++; |
| 6045 | bvec++; |
| 6046 | } |
| 6047 | } |
| 6048 | |
Josef Bacik | 02f57c7 | 2011-04-06 14:25:44 -0400 | [diff] [blame] | 6049 | submit: |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6050 | ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum, |
Josef Bacik | 1ae3993 | 2011-04-06 14:41:34 -0400 | [diff] [blame] | 6051 | csums, async_submit); |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6052 | if (!ret) |
| 6053 | return 0; |
| 6054 | |
| 6055 | bio_put(bio); |
| 6056 | out_err: |
| 6057 | dip->errors = 1; |
| 6058 | /* |
| 6059 | * before atomic variable goto zero, we must |
| 6060 | * make sure dip->errors is perceived to be set. |
| 6061 | */ |
| 6062 | smp_mb__before_atomic_dec(); |
| 6063 | if (atomic_dec_and_test(&dip->pending_bios)) |
| 6064 | bio_io_error(dip->orig_bio); |
| 6065 | |
| 6066 | /* bio_end_io() will handle error, so we needn't return it */ |
| 6067 | return 0; |
| 6068 | } |
| 6069 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6070 | static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode, |
| 6071 | loff_t file_offset) |
| 6072 | { |
| 6073 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 6074 | struct btrfs_dio_private *dip; |
| 6075 | struct bio_vec *bvec = bio->bi_io_vec; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6076 | int skip_sum; |
Christoph Hellwig | 7b6d91d | 2010-08-07 18:20:39 +0200 | [diff] [blame] | 6077 | int write = rw & REQ_WRITE; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6078 | int ret = 0; |
| 6079 | |
| 6080 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
| 6081 | |
| 6082 | dip = kmalloc(sizeof(*dip), GFP_NOFS); |
| 6083 | if (!dip) { |
| 6084 | ret = -ENOMEM; |
| 6085 | goto free_ordered; |
| 6086 | } |
| 6087 | dip->csums = NULL; |
| 6088 | |
Josef Bacik | 98bc314 | 2011-03-22 11:00:46 -0400 | [diff] [blame] | 6089 | /* Write's use the ordered csum stuff, so we don't need dip->csums */ |
| 6090 | if (!write && !skip_sum) { |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6091 | dip->csums = kmalloc(sizeof(u32) * bio->bi_vcnt, GFP_NOFS); |
| 6092 | if (!dip->csums) { |
Daniel J Blueman | b4966b7 | 2011-03-09 16:46:42 +0000 | [diff] [blame] | 6093 | kfree(dip); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6094 | ret = -ENOMEM; |
| 6095 | goto free_ordered; |
| 6096 | } |
| 6097 | } |
| 6098 | |
| 6099 | dip->private = bio->bi_private; |
| 6100 | dip->inode = inode; |
| 6101 | dip->logical_offset = file_offset; |
| 6102 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6103 | dip->bytes = 0; |
| 6104 | do { |
| 6105 | dip->bytes += bvec->bv_len; |
| 6106 | bvec++; |
| 6107 | } while (bvec <= (bio->bi_io_vec + bio->bi_vcnt - 1)); |
| 6108 | |
Chris Mason | 46bfbb5 | 2010-05-26 11:04:10 -0400 | [diff] [blame] | 6109 | dip->disk_bytenr = (u64)bio->bi_sector << 9; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6110 | bio->bi_private = dip; |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6111 | dip->errors = 0; |
| 6112 | dip->orig_bio = bio; |
| 6113 | atomic_set(&dip->pending_bios, 0); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6114 | |
| 6115 | if (write) |
| 6116 | bio->bi_end_io = btrfs_endio_direct_write; |
| 6117 | else |
| 6118 | bio->bi_end_io = btrfs_endio_direct_read; |
| 6119 | |
Miao Xie | e65e153 | 2010-11-22 03:04:43 +0000 | [diff] [blame] | 6120 | ret = btrfs_submit_direct_hook(rw, dip, skip_sum); |
| 6121 | if (!ret) |
Chris Mason | eaf25d9 | 2010-05-25 09:48:28 -0400 | [diff] [blame] | 6122 | return; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6123 | free_ordered: |
| 6124 | /* |
| 6125 | * If this is a write, we need to clean up the reserved space and kill |
| 6126 | * the ordered extent. |
| 6127 | */ |
| 6128 | if (write) { |
| 6129 | struct btrfs_ordered_extent *ordered; |
Josef Bacik | 955256f | 2010-11-19 09:41:10 -0500 | [diff] [blame] | 6130 | ordered = btrfs_lookup_ordered_extent(inode, file_offset); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6131 | if (!test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags) && |
| 6132 | !test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags)) |
| 6133 | btrfs_free_reserved_extent(root, ordered->start, |
| 6134 | ordered->disk_len); |
| 6135 | btrfs_put_ordered_extent(ordered); |
| 6136 | btrfs_put_ordered_extent(ordered); |
| 6137 | } |
| 6138 | bio_endio(bio, ret); |
| 6139 | } |
| 6140 | |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6141 | static ssize_t check_direct_IO(struct btrfs_root *root, int rw, struct kiocb *iocb, |
| 6142 | const struct iovec *iov, loff_t offset, |
| 6143 | unsigned long nr_segs) |
| 6144 | { |
| 6145 | int seg; |
Josef Bacik | a1b75f7 | 2011-04-08 15:51:18 +0000 | [diff] [blame] | 6146 | int i; |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6147 | size_t size; |
| 6148 | unsigned long addr; |
| 6149 | unsigned blocksize_mask = root->sectorsize - 1; |
| 6150 | ssize_t retval = -EINVAL; |
| 6151 | loff_t end = offset; |
| 6152 | |
| 6153 | if (offset & blocksize_mask) |
| 6154 | goto out; |
| 6155 | |
| 6156 | /* Check the memory alignment. Blocks cannot straddle pages */ |
| 6157 | for (seg = 0; seg < nr_segs; seg++) { |
| 6158 | addr = (unsigned long)iov[seg].iov_base; |
| 6159 | size = iov[seg].iov_len; |
| 6160 | end += size; |
Josef Bacik | a1b75f7 | 2011-04-08 15:51:18 +0000 | [diff] [blame] | 6161 | if ((addr & blocksize_mask) || (size & blocksize_mask)) |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6162 | goto out; |
Josef Bacik | a1b75f7 | 2011-04-08 15:51:18 +0000 | [diff] [blame] | 6163 | |
| 6164 | /* If this is a write we don't need to check anymore */ |
| 6165 | if (rw & WRITE) |
| 6166 | continue; |
| 6167 | |
| 6168 | /* |
| 6169 | * Check to make sure we don't have duplicate iov_base's in this |
| 6170 | * iovec, if so return EINVAL, otherwise we'll get csum errors |
| 6171 | * when reading back. |
| 6172 | */ |
| 6173 | for (i = seg + 1; i < nr_segs; i++) { |
| 6174 | if (iov[seg].iov_base == iov[i].iov_base) |
| 6175 | goto out; |
| 6176 | } |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6177 | } |
| 6178 | retval = 0; |
| 6179 | out: |
| 6180 | return retval; |
| 6181 | } |
Chris Mason | 1643298 | 2008-04-10 10:23:21 -0400 | [diff] [blame] | 6182 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, |
| 6183 | const struct iovec *iov, loff_t offset, |
| 6184 | unsigned long nr_segs) |
| 6185 | { |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6186 | struct file *file = iocb->ki_filp; |
| 6187 | struct inode *inode = file->f_mapping->host; |
| 6188 | struct btrfs_ordered_extent *ordered; |
Chris Mason | 4845e44 | 2010-05-25 20:56:50 -0400 | [diff] [blame] | 6189 | struct extent_state *cached_state = NULL; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6190 | u64 lockstart, lockend; |
| 6191 | ssize_t ret; |
Chris Mason | 4845e44 | 2010-05-25 20:56:50 -0400 | [diff] [blame] | 6192 | int writing = rw & WRITE; |
| 6193 | int write_bits = 0; |
Chris Mason | 3f7c579 | 2010-05-26 10:59:53 -0400 | [diff] [blame] | 6194 | size_t count = iov_length(iov, nr_segs); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6195 | |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6196 | if (check_direct_IO(BTRFS_I(inode)->root, rw, iocb, iov, |
| 6197 | offset, nr_segs)) { |
| 6198 | return 0; |
| 6199 | } |
| 6200 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6201 | lockstart = offset; |
Chris Mason | 3f7c579 | 2010-05-26 10:59:53 -0400 | [diff] [blame] | 6202 | lockend = offset + count - 1; |
| 6203 | |
| 6204 | if (writing) { |
| 6205 | ret = btrfs_delalloc_reserve_space(inode, count); |
| 6206 | if (ret) |
| 6207 | goto out; |
| 6208 | } |
Chris Mason | 4845e44 | 2010-05-25 20:56:50 -0400 | [diff] [blame] | 6209 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6210 | while (1) { |
Chris Mason | 4845e44 | 2010-05-25 20:56:50 -0400 | [diff] [blame] | 6211 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
| 6212 | 0, &cached_state, GFP_NOFS); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6213 | /* |
| 6214 | * We're concerned with the entire range that we're going to be |
| 6215 | * doing DIO to, so we need to make sure theres no ordered |
| 6216 | * extents in this range. |
| 6217 | */ |
| 6218 | ordered = btrfs_lookup_ordered_range(inode, lockstart, |
| 6219 | lockend - lockstart + 1); |
| 6220 | if (!ordered) |
| 6221 | break; |
Chris Mason | 4845e44 | 2010-05-25 20:56:50 -0400 | [diff] [blame] | 6222 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
| 6223 | &cached_state, GFP_NOFS); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6224 | btrfs_start_ordered_extent(inode, ordered, 1); |
| 6225 | btrfs_put_ordered_extent(ordered); |
| 6226 | cond_resched(); |
| 6227 | } |
| 6228 | |
Chris Mason | 4845e44 | 2010-05-25 20:56:50 -0400 | [diff] [blame] | 6229 | /* |
| 6230 | * we don't use btrfs_set_extent_delalloc because we don't want |
| 6231 | * the dirty or uptodate bits |
| 6232 | */ |
| 6233 | if (writing) { |
| 6234 | write_bits = EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING; |
| 6235 | ret = set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, |
| 6236 | EXTENT_DELALLOC, 0, NULL, &cached_state, |
| 6237 | GFP_NOFS); |
| 6238 | if (ret) { |
| 6239 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, |
| 6240 | lockend, EXTENT_LOCKED | write_bits, |
| 6241 | 1, 0, &cached_state, GFP_NOFS); |
| 6242 | goto out; |
| 6243 | } |
| 6244 | } |
| 6245 | |
| 6246 | free_extent_state(cached_state); |
| 6247 | cached_state = NULL; |
| 6248 | |
Chris Mason | 5a5f79b | 2010-05-26 21:33:37 -0400 | [diff] [blame] | 6249 | ret = __blockdev_direct_IO(rw, iocb, inode, |
| 6250 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev, |
| 6251 | iov, offset, nr_segs, btrfs_get_blocks_direct, NULL, |
| 6252 | btrfs_submit_direct, 0); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6253 | |
| 6254 | if (ret < 0 && ret != -EIOCBQUEUED) { |
Chris Mason | 4845e44 | 2010-05-25 20:56:50 -0400 | [diff] [blame] | 6255 | clear_extent_bit(&BTRFS_I(inode)->io_tree, offset, |
| 6256 | offset + iov_length(iov, nr_segs) - 1, |
| 6257 | EXTENT_LOCKED | write_bits, 1, 0, |
| 6258 | &cached_state, GFP_NOFS); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6259 | } else if (ret >= 0 && ret < iov_length(iov, nr_segs)) { |
| 6260 | /* |
| 6261 | * We're falling back to buffered, unlock the section we didn't |
| 6262 | * do IO on. |
| 6263 | */ |
Chris Mason | 4845e44 | 2010-05-25 20:56:50 -0400 | [diff] [blame] | 6264 | clear_extent_bit(&BTRFS_I(inode)->io_tree, offset + ret, |
| 6265 | offset + iov_length(iov, nr_segs) - 1, |
| 6266 | EXTENT_LOCKED | write_bits, 1, 0, |
| 6267 | &cached_state, GFP_NOFS); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6268 | } |
Chris Mason | 4845e44 | 2010-05-25 20:56:50 -0400 | [diff] [blame] | 6269 | out: |
| 6270 | free_extent_state(cached_state); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 6271 | return ret; |
Chris Mason | 1643298 | 2008-04-10 10:23:21 -0400 | [diff] [blame] | 6272 | } |
| 6273 | |
Yehuda Sadeh | 1506fcc | 2009-01-21 14:39:14 -0500 | [diff] [blame] | 6274 | static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| 6275 | __u64 start, __u64 len) |
| 6276 | { |
Chris Mason | ec29ed5 | 2011-02-23 16:23:20 -0500 | [diff] [blame] | 6277 | return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent_fiemap); |
Yehuda Sadeh | 1506fcc | 2009-01-21 14:39:14 -0500 | [diff] [blame] | 6278 | } |
| 6279 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6280 | int btrfs_readpage(struct file *file, struct page *page) |
| 6281 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6282 | struct extent_io_tree *tree; |
| 6283 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
Jan Schmidt | 8ddc7d9 | 2011-06-13 20:02:58 +0200 | [diff] [blame] | 6284 | return extent_read_full_page(tree, page, btrfs_get_extent, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6285 | } |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 6286 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6287 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
| 6288 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6289 | struct extent_io_tree *tree; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6290 | |
| 6291 | |
| 6292 | if (current->flags & PF_MEMALLOC) { |
| 6293 | redirty_page_for_writepage(wbc, page); |
| 6294 | unlock_page(page); |
| 6295 | return 0; |
| 6296 | } |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6297 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6298 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
| 6299 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6300 | |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 6301 | int btrfs_writepages(struct address_space *mapping, |
| 6302 | struct writeback_control *wbc) |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 6303 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6304 | struct extent_io_tree *tree; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 6305 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6306 | tree = &BTRFS_I(mapping->host)->io_tree; |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 6307 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
| 6308 | } |
| 6309 | |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 6310 | static int |
| 6311 | btrfs_readpages(struct file *file, struct address_space *mapping, |
| 6312 | struct list_head *pages, unsigned nr_pages) |
| 6313 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6314 | struct extent_io_tree *tree; |
| 6315 | tree = &BTRFS_I(mapping->host)->io_tree; |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 6316 | return extent_readpages(tree, mapping, pages, nr_pages, |
| 6317 | btrfs_get_extent); |
| 6318 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6319 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6320 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6321 | struct extent_io_tree *tree; |
| 6322 | struct extent_map_tree *map; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6323 | int ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6324 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6325 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
| 6326 | map = &BTRFS_I(page->mapping->host)->extent_tree; |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 6327 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6328 | if (ret == 1) { |
| 6329 | ClearPagePrivate(page); |
| 6330 | set_page_private(page, 0); |
| 6331 | page_cache_release(page); |
| 6332 | } |
| 6333 | return ret; |
| 6334 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6335 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6336 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
| 6337 | { |
Chris Mason | 98509cf | 2008-09-11 15:51:43 -0400 | [diff] [blame] | 6338 | if (PageWriteback(page) || PageDirty(page)) |
| 6339 | return 0; |
Yan Zheng | b335b00 | 2009-02-12 10:06:04 -0500 | [diff] [blame] | 6340 | return __btrfs_releasepage(page, gfp_flags & GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6341 | } |
| 6342 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6343 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
| 6344 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6345 | struct extent_io_tree *tree; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6346 | struct btrfs_ordered_extent *ordered; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6347 | struct extent_state *cached_state = NULL; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6348 | u64 page_start = page_offset(page); |
| 6349 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6350 | |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 6351 | |
| 6352 | /* |
| 6353 | * we have the page locked, so new writeback can't start, |
| 6354 | * and the dirty bit won't be cleared while we are here. |
| 6355 | * |
| 6356 | * Wait for IO on this page so that we can safely clear |
| 6357 | * the PagePrivate2 bit and do ordered accounting |
| 6358 | */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6359 | wait_on_page_writeback(page); |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 6360 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 6361 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6362 | if (offset) { |
| 6363 | btrfs_releasepage(page, GFP_NOFS); |
| 6364 | return; |
| 6365 | } |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6366 | lock_extent_bits(tree, page_start, page_end, 0, &cached_state, |
| 6367 | GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6368 | ordered = btrfs_lookup_ordered_extent(page->mapping->host, |
| 6369 | page_offset(page)); |
| 6370 | if (ordered) { |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 6371 | /* |
| 6372 | * IO on this page will never be started, so we need |
| 6373 | * to account for any ordered extents now |
| 6374 | */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6375 | clear_extent_bit(tree, page_start, page_end, |
| 6376 | EXTENT_DIRTY | EXTENT_DELALLOC | |
Josef Bacik | 32c00af | 2009-10-08 13:34:05 -0400 | [diff] [blame] | 6377 | EXTENT_LOCKED | EXTENT_DO_ACCOUNTING, 1, 0, |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6378 | &cached_state, GFP_NOFS); |
Chris Mason | 8b62b72 | 2009-09-02 16:53:46 -0400 | [diff] [blame] | 6379 | /* |
| 6380 | * whoever cleared the private bit is responsible |
| 6381 | * for the finish_ordered_io |
| 6382 | */ |
| 6383 | if (TestClearPagePrivate2(page)) { |
| 6384 | btrfs_finish_ordered_io(page->mapping->host, |
| 6385 | page_start, page_end); |
| 6386 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6387 | btrfs_put_ordered_extent(ordered); |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6388 | cached_state = NULL; |
| 6389 | lock_extent_bits(tree, page_start, page_end, 0, &cached_state, |
| 6390 | GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6391 | } |
| 6392 | clear_extent_bit(tree, page_start, page_end, |
Josef Bacik | 32c00af | 2009-10-08 13:34:05 -0400 | [diff] [blame] | 6393 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6394 | EXTENT_DO_ACCOUNTING, 1, 1, &cached_state, GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6395 | __btrfs_releasepage(page, GFP_NOFS); |
| 6396 | |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 6397 | ClearPageChecked(page); |
Chris Mason | 9ad6b7b | 2008-04-18 16:11:30 -0400 | [diff] [blame] | 6398 | if (PagePrivate(page)) { |
Chris Mason | 9ad6b7b | 2008-04-18 16:11:30 -0400 | [diff] [blame] | 6399 | ClearPagePrivate(page); |
| 6400 | set_page_private(page, 0); |
| 6401 | page_cache_release(page); |
| 6402 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6403 | } |
| 6404 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6405 | /* |
| 6406 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets |
| 6407 | * called from a page fault handler when a page is first dirtied. Hence we must |
| 6408 | * be careful to check for EOF conditions here. We set the page up correctly |
| 6409 | * for a written page which means we get ENOSPC checking when writing into |
| 6410 | * holes and correct delalloc and unwritten extent mapping on filesystems that |
| 6411 | * support these features. |
| 6412 | * |
| 6413 | * We are not allowed to take the i_mutex here so we have to play games to |
| 6414 | * protect against truncate races as the page could now be beyond EOF. Because |
| 6415 | * vmtruncate() writes the inode size before removing pages, once we have the |
| 6416 | * page lock we can determine safely if the page is beyond EOF. If it is not |
| 6417 | * beyond EOF, then the page is guaranteed safe against truncation until we |
| 6418 | * unlock the page. |
| 6419 | */ |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 6420 | 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] | 6421 | { |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 6422 | struct page *page = vmf->page; |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 6423 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 6424 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6425 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 6426 | struct btrfs_ordered_extent *ordered; |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6427 | struct extent_state *cached_state = NULL; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6428 | char *kaddr; |
| 6429 | unsigned long zero_start; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6430 | loff_t size; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 6431 | int ret; |
Chris Mason | 9998eb7 | 2012-01-25 13:47:40 -0500 | [diff] [blame] | 6432 | int reserved = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6433 | u64 page_start; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6434 | u64 page_end; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6435 | |
Yan, Zheng | 0ca1f7c | 2010-05-16 10:48:47 -0400 | [diff] [blame] | 6436 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
Chris Mason | 9998eb7 | 2012-01-25 13:47:40 -0500 | [diff] [blame] | 6437 | if (!ret) { |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 6438 | ret = btrfs_update_time(vma->vm_file); |
Chris Mason | 9998eb7 | 2012-01-25 13:47:40 -0500 | [diff] [blame] | 6439 | reserved = 1; |
| 6440 | } |
Nick Piggin | 56a76f8 | 2009-03-31 15:23:23 -0700 | [diff] [blame] | 6441 | if (ret) { |
| 6442 | if (ret == -ENOMEM) |
| 6443 | ret = VM_FAULT_OOM; |
| 6444 | else /* -ENOSPC, -EIO, etc */ |
| 6445 | ret = VM_FAULT_SIGBUS; |
Chris Mason | 9998eb7 | 2012-01-25 13:47:40 -0500 | [diff] [blame] | 6446 | if (reserved) |
| 6447 | goto out; |
| 6448 | goto out_noreserve; |
Nick Piggin | 56a76f8 | 2009-03-31 15:23:23 -0700 | [diff] [blame] | 6449 | } |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 6450 | |
Nick Piggin | 56a76f8 | 2009-03-31 15:23:23 -0700 | [diff] [blame] | 6451 | ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6452 | again: |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6453 | lock_page(page); |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6454 | size = i_size_read(inode); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6455 | page_start = page_offset(page); |
| 6456 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6457 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6458 | if ((page->mapping != inode->i_mapping) || |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6459 | (page_start >= size)) { |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6460 | /* page got truncated out from underneath us */ |
| 6461 | goto out_unlock; |
| 6462 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6463 | wait_on_page_writeback(page); |
| 6464 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6465 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state, |
| 6466 | GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6467 | set_page_extent_mapped(page); |
| 6468 | |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 6469 | /* |
| 6470 | * we can't set the delalloc bits if there are pending ordered |
| 6471 | * extents. Drop our locks and wait for them to finish |
| 6472 | */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6473 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 6474 | if (ordered) { |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6475 | unlock_extent_cached(io_tree, page_start, page_end, |
| 6476 | &cached_state, GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6477 | unlock_page(page); |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 6478 | btrfs_start_ordered_extent(inode, ordered, 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6479 | btrfs_put_ordered_extent(ordered); |
| 6480 | goto again; |
| 6481 | } |
| 6482 | |
Josef Bacik | fbf1908 | 2009-10-01 17:10:23 -0400 | [diff] [blame] | 6483 | /* |
| 6484 | * XXX - page_mkwrite gets called every time the page is dirtied, even |
| 6485 | * if it was already dirty, so for space accounting reasons we need to |
| 6486 | * clear any delalloc bits for the range we are fixing to save. There |
| 6487 | * is probably a better way to do this, but for now keep consistent with |
| 6488 | * prepare_pages in the normal write path. |
| 6489 | */ |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6490 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
Josef Bacik | 32c00af | 2009-10-08 13:34:05 -0400 | [diff] [blame] | 6491 | EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING, |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6492 | 0, 0, &cached_state, GFP_NOFS); |
Josef Bacik | fbf1908 | 2009-10-01 17:10:23 -0400 | [diff] [blame] | 6493 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6494 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
| 6495 | &cached_state); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 6496 | if (ret) { |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6497 | unlock_extent_cached(io_tree, page_start, page_end, |
| 6498 | &cached_state, GFP_NOFS); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 6499 | ret = VM_FAULT_SIGBUS; |
| 6500 | goto out_unlock; |
| 6501 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6502 | ret = 0; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6503 | |
| 6504 | /* page is wholly or partially inside EOF */ |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 6505 | if (page_start + PAGE_CACHE_SIZE > size) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6506 | zero_start = size & ~PAGE_CACHE_MASK; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6507 | else |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6508 | zero_start = PAGE_CACHE_SIZE; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6509 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6510 | if (zero_start != PAGE_CACHE_SIZE) { |
| 6511 | kaddr = kmap(page); |
| 6512 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
| 6513 | flush_dcache_page(page); |
| 6514 | kunmap(page); |
| 6515 | } |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 6516 | ClearPageChecked(page); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6517 | set_page_dirty(page); |
Chris Mason | 50a9b21 | 2009-09-11 12:33:12 -0400 | [diff] [blame] | 6518 | SetPageUptodate(page); |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 6519 | |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 6520 | BTRFS_I(inode)->last_trans = root->fs_info->generation; |
| 6521 | BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; |
| 6522 | |
Josef Bacik | 2ac55d4 | 2010-02-03 19:33:23 +0000 | [diff] [blame] | 6523 | 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] | 6524 | |
| 6525 | out_unlock: |
Chris Mason | 50a9b21 | 2009-09-11 12:33:12 -0400 | [diff] [blame] | 6526 | if (!ret) |
| 6527 | return VM_FAULT_LOCKED; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6528 | unlock_page(page); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 6529 | out: |
Josef Bacik | ec39e18 | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 6530 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
Chris Mason | 9998eb7 | 2012-01-25 13:47:40 -0500 | [diff] [blame] | 6531 | out_noreserve: |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 6532 | return ret; |
| 6533 | } |
| 6534 | |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 6535 | static int btrfs_truncate(struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6536 | { |
| 6537 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6538 | struct btrfs_block_rsv *rsv; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6539 | int ret; |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6540 | int err = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6541 | struct btrfs_trans_handle *trans; |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 6542 | unsigned long nr; |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 6543 | u64 mask = root->sectorsize - 1; |
Josef Bacik | 0712718 | 2011-08-19 10:29:59 -0400 | [diff] [blame] | 6544 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6545 | |
Josef Bacik | 5d5e103 | 2009-10-13 16:46:49 -0400 | [diff] [blame] | 6546 | ret = btrfs_truncate_page(inode->i_mapping, inode->i_size); |
| 6547 | if (ret) |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 6548 | return ret; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6549 | |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 6550 | btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6551 | btrfs_ordered_update_i_size(inode, inode->i_size, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6552 | |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6553 | /* |
| 6554 | * Yes ladies and gentelment, this is indeed ugly. The fact is we have |
| 6555 | * 3 things going on here |
| 6556 | * |
| 6557 | * 1) We need to reserve space for our orphan item and the space to |
| 6558 | * delete our orphan item. Lord knows we don't want to have a dangling |
| 6559 | * orphan item because we didn't reserve space to remove it. |
| 6560 | * |
| 6561 | * 2) We need to reserve space to update our inode. |
| 6562 | * |
| 6563 | * 3) We need to have something to cache all the space that is going to |
| 6564 | * be free'd up by the truncate operation, but also have some slack |
| 6565 | * space reserved in case it uses space during the truncate (thank you |
| 6566 | * very much snapshotting). |
| 6567 | * |
| 6568 | * And we need these to all be seperate. The fact is we can use alot of |
| 6569 | * space doing the truncate, and we have no earthly idea how much space |
| 6570 | * we will use, so we need the truncate reservation to be seperate so it |
| 6571 | * doesn't end up using space reserved for updating the inode or |
| 6572 | * removing the orphan item. We also need to be able to stop the |
| 6573 | * transaction and start a new one, which means we need to be able to |
| 6574 | * update the inode several times, and we have no idea of knowing how |
| 6575 | * many times that will be, so we can't just reserve 1 item for the |
| 6576 | * entirety of the opration, so that has to be done seperately as well. |
| 6577 | * Then there is the orphan item, which does indeed need to be held on |
| 6578 | * to for the whole operation, and we need nobody to touch this reserved |
| 6579 | * space except the orphan code. |
| 6580 | * |
| 6581 | * So that leaves us with |
| 6582 | * |
| 6583 | * 1) root->orphan_block_rsv - for the orphan deletion. |
| 6584 | * 2) rsv - for the truncate reservation, which we will steal from the |
| 6585 | * transaction reservation. |
| 6586 | * 3) fs_info->trans_block_rsv - this will have 1 items worth left for |
| 6587 | * updating the inode. |
| 6588 | */ |
| 6589 | rsv = btrfs_alloc_block_rsv(root); |
| 6590 | if (!rsv) |
| 6591 | return -ENOMEM; |
Josef Bacik | 4a33854 | 2011-08-29 11:01:31 -0400 | [diff] [blame] | 6592 | rsv->size = min_size; |
Josef Bacik | f0cd846 | 2011-03-04 14:37:08 -0500 | [diff] [blame] | 6593 | |
Josef Bacik | 907cbce | 2011-08-08 13:46:15 -0400 | [diff] [blame] | 6594 | /* |
Josef Bacik | 0712718 | 2011-08-19 10:29:59 -0400 | [diff] [blame] | 6595 | * 1 for the truncate slack space |
Josef Bacik | 907cbce | 2011-08-08 13:46:15 -0400 | [diff] [blame] | 6596 | * 1 for the orphan item we're going to add |
| 6597 | * 1 for the orphan item deletion |
| 6598 | * 1 for updating the inode. |
| 6599 | */ |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6600 | trans = btrfs_start_transaction(root, 4); |
| 6601 | if (IS_ERR(trans)) { |
| 6602 | err = PTR_ERR(trans); |
| 6603 | goto out; |
| 6604 | } |
Josef Bacik | f0cd846 | 2011-03-04 14:37:08 -0500 | [diff] [blame] | 6605 | |
Josef Bacik | 907cbce | 2011-08-08 13:46:15 -0400 | [diff] [blame] | 6606 | /* Migrate the slack space for the truncate to our reserve */ |
| 6607 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv, |
| 6608 | min_size); |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6609 | BUG_ON(ret); |
Josef Bacik | f0cd846 | 2011-03-04 14:37:08 -0500 | [diff] [blame] | 6610 | |
| 6611 | ret = btrfs_orphan_add(trans, inode); |
| 6612 | if (ret) { |
| 6613 | btrfs_end_transaction(trans, root); |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6614 | goto out; |
Josef Bacik | f0cd846 | 2011-03-04 14:37:08 -0500 | [diff] [blame] | 6615 | } |
| 6616 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 6617 | /* |
| 6618 | * setattr is responsible for setting the ordered_data_close flag, |
| 6619 | * but that is only tested during the last file release. That |
| 6620 | * could happen well after the next commit, leaving a great big |
| 6621 | * window where new writes may get lost if someone chooses to write |
| 6622 | * to this file after truncating to zero |
| 6623 | * |
| 6624 | * The inode doesn't have any dirty data here, and so if we commit |
| 6625 | * this is a noop. If someone immediately starts writing to the inode |
| 6626 | * it is very likely we'll catch some of their writes in this |
| 6627 | * transaction, and the commit will find this file on the ordered |
| 6628 | * data list with good things to send down. |
| 6629 | * |
| 6630 | * This is a best effort solution, there is still a window where |
| 6631 | * using truncate to replace the contents of the file will |
| 6632 | * end up with a zero length file after a crash. |
| 6633 | */ |
| 6634 | if (inode->i_size == 0 && BTRFS_I(inode)->ordered_data_close) |
| 6635 | btrfs_add_ordered_operation(trans, root, inode); |
| 6636 | |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6637 | while (1) { |
Josef Bacik | 36ba022 | 2011-10-18 12:15:48 -0400 | [diff] [blame] | 6638 | ret = btrfs_block_rsv_refill(root, rsv, min_size); |
Josef Bacik | 907cbce | 2011-08-08 13:46:15 -0400 | [diff] [blame] | 6639 | if (ret) { |
| 6640 | /* |
| 6641 | * This can only happen with the original transaction we |
| 6642 | * started above, every other time we shouldn't have a |
| 6643 | * transaction started yet. |
| 6644 | */ |
| 6645 | if (ret == -EAGAIN) |
| 6646 | goto end_trans; |
| 6647 | err = ret; |
| 6648 | break; |
| 6649 | } |
| 6650 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 6651 | if (!trans) { |
Josef Bacik | 907cbce | 2011-08-08 13:46:15 -0400 | [diff] [blame] | 6652 | /* Just need the 1 for updating the inode */ |
| 6653 | trans = btrfs_start_transaction(root, 1); |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6654 | if (IS_ERR(trans)) { |
Josef Bacik | 7041ee9 | 2011-12-09 13:26:22 -0500 | [diff] [blame] | 6655 | ret = err = PTR_ERR(trans); |
| 6656 | trans = NULL; |
| 6657 | break; |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6658 | } |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 6659 | } |
| 6660 | |
Josef Bacik | 907cbce | 2011-08-08 13:46:15 -0400 | [diff] [blame] | 6661 | trans->block_rsv = rsv; |
| 6662 | |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6663 | ret = btrfs_truncate_inode_items(trans, root, inode, |
| 6664 | inode->i_size, |
| 6665 | BTRFS_EXTENT_DATA_KEY); |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6666 | if (ret != -EAGAIN) { |
| 6667 | err = ret; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6668 | break; |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6669 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6670 | |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6671 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6672 | ret = btrfs_update_inode(trans, root, inode); |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6673 | if (ret) { |
| 6674 | err = ret; |
| 6675 | break; |
| 6676 | } |
Josef Bacik | 907cbce | 2011-08-08 13:46:15 -0400 | [diff] [blame] | 6677 | end_trans: |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6678 | nr = trans->blocks_used; |
| 6679 | btrfs_end_transaction(trans, root); |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 6680 | trans = NULL; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6681 | btrfs_btree_balance_dirty(root, nr); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6682 | } |
| 6683 | |
| 6684 | if (ret == 0 && inode->i_nlink > 0) { |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6685 | trans->block_rsv = root->orphan_block_rsv; |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6686 | ret = btrfs_orphan_del(trans, inode); |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6687 | if (ret) |
| 6688 | err = ret; |
Josef Bacik | ded5db9 | 2011-03-04 14:09:46 -0500 | [diff] [blame] | 6689 | } else if (ret && inode->i_nlink > 0) { |
| 6690 | /* |
| 6691 | * Failed to do the truncate, remove us from the in memory |
| 6692 | * orphan list. |
| 6693 | */ |
| 6694 | ret = btrfs_orphan_del(NULL, inode); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6695 | } |
| 6696 | |
Chris Mason | 917c16b | 2011-11-08 14:49:59 -0500 | [diff] [blame] | 6697 | if (trans) { |
| 6698 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
| 6699 | ret = btrfs_update_inode(trans, root, inode); |
| 6700 | if (ret && !err) |
| 6701 | err = ret; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 6702 | |
Chris Mason | 917c16b | 2011-11-08 14:49:59 -0500 | [diff] [blame] | 6703 | nr = trans->blocks_used; |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 6704 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | 917c16b | 2011-11-08 14:49:59 -0500 | [diff] [blame] | 6705 | btrfs_btree_balance_dirty(root, nr); |
| 6706 | } |
Josef Bacik | fcb80c2 | 2011-05-03 10:40:22 -0400 | [diff] [blame] | 6707 | |
| 6708 | out: |
| 6709 | btrfs_free_block_rsv(root, rsv); |
| 6710 | |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6711 | if (ret && !err) |
| 6712 | err = ret; |
Josef Bacik | a41ad39 | 2011-01-31 15:30:16 -0500 | [diff] [blame] | 6713 | |
Josef Bacik | 3893e33 | 2011-01-31 16:03:11 -0500 | [diff] [blame] | 6714 | return err; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6715 | } |
| 6716 | |
Sven Wegener | 3b96362 | 2008-06-09 21:57:42 -0400 | [diff] [blame] | 6717 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 6718 | * create a new subvolume directory/inode (helper for the ioctl). |
| 6719 | */ |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 6720 | int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 6721 | struct btrfs_root *new_root, u64 new_dirid) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6722 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6723 | struct inode *inode; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 6724 | int err; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 6725 | u64 index = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6726 | |
Florian Albrechtskirchinger | 12fc9d0 | 2012-02-10 22:15:54 +0100 | [diff] [blame] | 6727 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, |
| 6728 | new_dirid, new_dirid, |
| 6729 | S_IFDIR | (~current_umask() & S_IRWXUGO), |
| 6730 | &index); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 6731 | if (IS_ERR(inode)) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 6732 | return PTR_ERR(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6733 | inode->i_op = &btrfs_dir_inode_operations; |
| 6734 | inode->i_fop = &btrfs_dir_file_operations; |
| 6735 | |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 6736 | set_nlink(inode, 1); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 6737 | btrfs_i_size_write(inode, 0); |
Sven Wegener | 3b96362 | 2008-06-09 21:57:42 -0400 | [diff] [blame] | 6738 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 6739 | err = btrfs_update_inode(trans, new_root, inode); |
| 6740 | BUG_ON(err); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 6741 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 6742 | iput(inode); |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 6743 | return 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6744 | } |
| 6745 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6746 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
| 6747 | { |
| 6748 | struct btrfs_inode *ei; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6749 | struct inode *inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6750 | |
| 6751 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); |
| 6752 | if (!ei) |
| 6753 | return NULL; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6754 | |
| 6755 | ei->root = NULL; |
| 6756 | ei->space_info = NULL; |
| 6757 | ei->generation = 0; |
| 6758 | ei->sequence = 0; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 6759 | ei->last_trans = 0; |
Chris Mason | 257c62e | 2009-10-13 13:21:08 -0400 | [diff] [blame] | 6760 | ei->last_sub_trans = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 6761 | ei->logged_trans = 0; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6762 | ei->delalloc_bytes = 0; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6763 | ei->disk_i_size = 0; |
| 6764 | ei->flags = 0; |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 6765 | ei->csum_bytes = 0; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6766 | ei->index_cnt = (u64)-1; |
| 6767 | ei->last_unlink_trans = 0; |
| 6768 | |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 6769 | spin_lock_init(&ei->lock); |
| 6770 | ei->outstanding_extents = 0; |
| 6771 | ei->reserved_extents = 0; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6772 | |
| 6773 | ei->ordered_data_close = 0; |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 6774 | ei->orphan_meta_reserved = 0; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6775 | ei->dummy_inode = 0; |
Chris Mason | 4cb5300 | 2011-05-24 15:35:30 -0400 | [diff] [blame] | 6776 | ei->in_defrag = 0; |
Josef Bacik | 7fd2ae2 | 2011-11-08 15:47:34 -0500 | [diff] [blame] | 6777 | ei->delalloc_meta_reserved = 0; |
Li Zefan | 261507a0 | 2010-12-17 14:21:50 +0800 | [diff] [blame] | 6778 | ei->force_compress = BTRFS_COMPRESS_NONE; |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6779 | |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 6780 | ei->delayed_node = NULL; |
| 6781 | |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6782 | inode = &ei->vfs_inode; |
David Sterba | a8067e0 | 2011-04-21 00:34:43 +0200 | [diff] [blame] | 6783 | extent_map_tree_init(&ei->extent_tree); |
David Sterba | f993c88 | 2011-04-20 23:35:57 +0200 | [diff] [blame] | 6784 | extent_io_tree_init(&ei->io_tree, &inode->i_data); |
| 6785 | extent_io_tree_init(&ei->io_failure_tree, &inode->i_data); |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6786 | mutex_init(&ei->log_mutex); |
Josef Bacik | f248679 | 2012-01-13 12:09:22 -0500 | [diff] [blame] | 6787 | mutex_init(&ei->delalloc_mutex); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6788 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 6789 | INIT_LIST_HEAD(&ei->i_orphan); |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6790 | INIT_LIST_HEAD(&ei->delalloc_inodes); |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 6791 | INIT_LIST_HEAD(&ei->ordered_operations); |
Yan, Zheng | 2ead6ae | 2010-05-16 10:46:25 -0400 | [diff] [blame] | 6792 | RB_CLEAR_NODE(&ei->rb_node); |
| 6793 | |
| 6794 | return inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6795 | } |
| 6796 | |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 6797 | static void btrfs_i_callback(struct rcu_head *head) |
| 6798 | { |
| 6799 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 6800 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
| 6801 | } |
| 6802 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6803 | void btrfs_destroy_inode(struct inode *inode) |
| 6804 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6805 | struct btrfs_ordered_extent *ordered; |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 6806 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 6807 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6808 | WARN_ON(!list_empty(&inode->i_dentry)); |
| 6809 | WARN_ON(inode->i_data.nrpages); |
Josef Bacik | 9e0baf6 | 2011-07-15 15:16:44 +0000 | [diff] [blame] | 6810 | WARN_ON(BTRFS_I(inode)->outstanding_extents); |
| 6811 | WARN_ON(BTRFS_I(inode)->reserved_extents); |
Josef Bacik | 7709cde | 2011-08-04 10:25:02 -0400 | [diff] [blame] | 6812 | WARN_ON(BTRFS_I(inode)->delalloc_bytes); |
| 6813 | WARN_ON(BTRFS_I(inode)->csum_bytes); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6814 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 6815 | /* |
Josef Bacik | a6dbd42 | 2009-11-11 15:53:34 -0500 | [diff] [blame] | 6816 | * This can happen where we create an inode, but somebody else also |
| 6817 | * created the same inode and we need to destroy the one we already |
| 6818 | * created. |
| 6819 | */ |
| 6820 | if (!root) |
| 6821 | goto free; |
| 6822 | |
| 6823 | /* |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 6824 | * Make sure we're properly removed from the ordered operation |
| 6825 | * lists. |
| 6826 | */ |
| 6827 | smp_mb(); |
| 6828 | if (!list_empty(&BTRFS_I(inode)->ordered_operations)) { |
| 6829 | spin_lock(&root->fs_info->ordered_extent_lock); |
| 6830 | list_del_init(&BTRFS_I(inode)->ordered_operations); |
| 6831 | spin_unlock(&root->fs_info->ordered_extent_lock); |
| 6832 | } |
| 6833 | |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 6834 | spin_lock(&root->orphan_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 6835 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 6836 | printk(KERN_INFO "BTRFS: inode %llu still on the orphan list\n", |
| 6837 | (unsigned long long)btrfs_ino(inode)); |
Yan, Zheng | 8082510 | 2009-11-12 09:35:36 +0000 | [diff] [blame] | 6838 | list_del_init(&BTRFS_I(inode)->i_orphan); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 6839 | } |
Yan, Zheng | d68fc57 | 2010-05-16 10:49:58 -0400 | [diff] [blame] | 6840 | spin_unlock(&root->orphan_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 6841 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 6842 | while (1) { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6843 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); |
| 6844 | if (!ordered) |
| 6845 | break; |
| 6846 | else { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 6847 | printk(KERN_ERR "btrfs found ordered " |
| 6848 | "extent %llu %llu on inode cleanup\n", |
| 6849 | (unsigned long long)ordered->file_offset, |
| 6850 | (unsigned long long)ordered->len); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 6851 | btrfs_remove_ordered_extent(inode, ordered); |
| 6852 | btrfs_put_ordered_extent(ordered); |
| 6853 | btrfs_put_ordered_extent(ordered); |
| 6854 | } |
| 6855 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 6856 | inode_tree_del(inode); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 6857 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); |
Josef Bacik | a6dbd42 | 2009-11-11 15:53:34 -0500 | [diff] [blame] | 6858 | free: |
Miao Xie | 16cdcec | 2011-04-22 18:12:22 +0800 | [diff] [blame] | 6859 | btrfs_remove_delayed_node(inode); |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 6860 | call_rcu(&inode->i_rcu, btrfs_i_callback); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6861 | } |
| 6862 | |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 6863 | int btrfs_drop_inode(struct inode *inode) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 6864 | { |
| 6865 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 6866 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 6867 | if (btrfs_root_refs(&root->root_item) == 0 && |
Chris Mason | 2cf8572 | 2011-07-26 15:35:09 -0400 | [diff] [blame] | 6868 | !btrfs_is_free_space_inode(root, inode)) |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 6869 | return 1; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 6870 | else |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 6871 | return generic_drop_inode(inode); |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 6872 | } |
| 6873 | |
Sven Wegener | 0ee0fda | 2008-07-30 16:54:26 -0400 | [diff] [blame] | 6874 | static void init_once(void *foo) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6875 | { |
| 6876 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; |
| 6877 | |
| 6878 | inode_init_once(&ei->vfs_inode); |
| 6879 | } |
| 6880 | |
| 6881 | void btrfs_destroy_cachep(void) |
| 6882 | { |
| 6883 | if (btrfs_inode_cachep) |
| 6884 | kmem_cache_destroy(btrfs_inode_cachep); |
| 6885 | if (btrfs_trans_handle_cachep) |
| 6886 | kmem_cache_destroy(btrfs_trans_handle_cachep); |
| 6887 | if (btrfs_transaction_cachep) |
| 6888 | kmem_cache_destroy(btrfs_transaction_cachep); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6889 | if (btrfs_path_cachep) |
| 6890 | kmem_cache_destroy(btrfs_path_cachep); |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 6891 | if (btrfs_free_space_cachep) |
| 6892 | kmem_cache_destroy(btrfs_free_space_cachep); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6893 | } |
| 6894 | |
| 6895 | int btrfs_init_cachep(void) |
| 6896 | { |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 6897 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", |
| 6898 | sizeof(struct btrfs_inode), 0, |
| 6899 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, init_once); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6900 | if (!btrfs_inode_cachep) |
| 6901 | goto fail; |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 6902 | |
| 6903 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", |
| 6904 | sizeof(struct btrfs_trans_handle), 0, |
| 6905 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6906 | if (!btrfs_trans_handle_cachep) |
| 6907 | goto fail; |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 6908 | |
| 6909 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", |
| 6910 | sizeof(struct btrfs_transaction), 0, |
| 6911 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6912 | if (!btrfs_transaction_cachep) |
| 6913 | goto fail; |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 6914 | |
| 6915 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", |
| 6916 | sizeof(struct btrfs_path), 0, |
| 6917 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6918 | if (!btrfs_path_cachep) |
| 6919 | goto fail; |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 6920 | |
Josef Bacik | dc89e98 | 2011-01-28 17:05:48 -0500 | [diff] [blame] | 6921 | btrfs_free_space_cachep = kmem_cache_create("btrfs_free_space_cache", |
| 6922 | sizeof(struct btrfs_free_space), 0, |
| 6923 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
| 6924 | if (!btrfs_free_space_cachep) |
| 6925 | goto fail; |
| 6926 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6927 | return 0; |
| 6928 | fail: |
| 6929 | btrfs_destroy_cachep(); |
| 6930 | return -ENOMEM; |
| 6931 | } |
| 6932 | |
| 6933 | static int btrfs_getattr(struct vfsmount *mnt, |
| 6934 | struct dentry *dentry, struct kstat *stat) |
| 6935 | { |
| 6936 | struct inode *inode = dentry->d_inode; |
David Sterba | fadc0d8 | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 6937 | u32 blocksize = inode->i_sb->s_blocksize; |
| 6938 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6939 | generic_fillattr(inode, stat); |
Al Viro | 0ee5dc6 | 2011-07-07 15:44:25 -0400 | [diff] [blame] | 6940 | stat->dev = BTRFS_I(inode)->root->anon_dev; |
Chris Mason | d666746 | 2008-01-03 14:51:00 -0500 | [diff] [blame] | 6941 | stat->blksize = PAGE_CACHE_SIZE; |
David Sterba | fadc0d8 | 2011-11-20 07:33:38 -0500 | [diff] [blame] | 6942 | stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) + |
| 6943 | ALIGN(BTRFS_I(inode)->delalloc_bytes, blocksize)) >> 9; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6944 | return 0; |
| 6945 | } |
| 6946 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 6947 | /* |
| 6948 | * If a file is moved, it will inherit the cow and compression flags of the new |
| 6949 | * directory. |
| 6950 | */ |
| 6951 | static void fixup_inode_flags(struct inode *dir, struct inode *inode) |
| 6952 | { |
| 6953 | struct btrfs_inode *b_dir = BTRFS_I(dir); |
| 6954 | struct btrfs_inode *b_inode = BTRFS_I(inode); |
| 6955 | |
| 6956 | if (b_dir->flags & BTRFS_INODE_NODATACOW) |
| 6957 | b_inode->flags |= BTRFS_INODE_NODATACOW; |
| 6958 | else |
| 6959 | b_inode->flags &= ~BTRFS_INODE_NODATACOW; |
| 6960 | |
| 6961 | if (b_dir->flags & BTRFS_INODE_COMPRESS) |
| 6962 | b_inode->flags |= BTRFS_INODE_COMPRESS; |
| 6963 | else |
| 6964 | b_inode->flags &= ~BTRFS_INODE_COMPRESS; |
| 6965 | } |
| 6966 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 6967 | static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 6968 | struct inode *new_dir, struct dentry *new_dentry) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6969 | { |
| 6970 | struct btrfs_trans_handle *trans; |
| 6971 | struct btrfs_root *root = BTRFS_I(old_dir)->root; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 6972 | struct btrfs_root *dest = BTRFS_I(new_dir)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6973 | struct inode *new_inode = new_dentry->d_inode; |
| 6974 | struct inode *old_inode = old_dentry->d_inode; |
| 6975 | struct timespec ctime = CURRENT_TIME; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 6976 | u64 index = 0; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 6977 | u64 root_objectid; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6978 | int ret; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 6979 | u64 old_ino = btrfs_ino(old_inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6980 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 6981 | if (btrfs_ino(new_dir) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
Yan, Zheng | f679a84 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 6982 | return -EPERM; |
| 6983 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 6984 | /* we only allow rename subvolume link between subvolumes */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 6985 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest) |
Chris Mason | 3394e16 | 2008-11-17 20:42:26 -0500 | [diff] [blame] | 6986 | return -EXDEV; |
| 6987 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 6988 | if (old_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID || |
| 6989 | (new_inode && btrfs_ino(new_inode) == BTRFS_FIRST_FREE_OBJECTID)) |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 6990 | return -ENOTEMPTY; |
| 6991 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6992 | if (S_ISDIR(old_inode->i_mode) && new_inode && |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 6993 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 6994 | return -ENOTEMPTY; |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 6995 | /* |
| 6996 | * we're using rename to replace one file with another. |
| 6997 | * and the replacement file is large. Start IO on it now so |
| 6998 | * we don't add too much work to the end of the transaction |
| 6999 | */ |
Bartlomiej Zolnierkiewicz | 4baf8c9 | 2009-08-07 13:47:08 -0400 | [diff] [blame] | 7000 | 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] | 7001 | old_inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT) |
| 7002 | filemap_flush(old_inode->i_mapping); |
| 7003 | |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7004 | /* close the racy window with snapshot create/destroy ioctl */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7005 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7006 | down_read(&root->fs_info->subvol_sem); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 7007 | /* |
| 7008 | * We want to reserve the absolute worst case amount of items. So if |
| 7009 | * both inodes are subvols and we need to unlink them then that would |
| 7010 | * require 4 item modifications, but if they are both normal inodes it |
| 7011 | * would require 5 item modifications, so we'll assume their normal |
| 7012 | * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items |
| 7013 | * should cover the worst case number of items we'll modify. |
| 7014 | */ |
| 7015 | trans = btrfs_start_transaction(root, 20); |
Johann Lombardi | b44c59a | 2011-03-31 13:23:47 +0000 | [diff] [blame] | 7016 | if (IS_ERR(trans)) { |
| 7017 | ret = PTR_ERR(trans); |
| 7018 | goto out_notrans; |
| 7019 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7020 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7021 | if (dest != root) |
| 7022 | btrfs_record_root_in_trans(trans, dest); |
| 7023 | |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 7024 | ret = btrfs_set_inode_index(new_dir, &index); |
| 7025 | if (ret) |
| 7026 | goto out_fail; |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7027 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7028 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7029 | /* force full log commit if subvolume involved. */ |
| 7030 | root->fs_info->last_trans_log_full_commit = trans->transid; |
| 7031 | } else { |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 7032 | ret = btrfs_insert_inode_ref(trans, dest, |
| 7033 | new_dentry->d_name.name, |
| 7034 | new_dentry->d_name.len, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7035 | old_ino, |
| 7036 | btrfs_ino(new_dir), index); |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 7037 | if (ret) |
| 7038 | goto out_fail; |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7039 | /* |
| 7040 | * this is an ugly little race, but the rename is required |
| 7041 | * to make sure that if we crash, the inode is either at the |
| 7042 | * old name or the new one. pinning the log transaction lets |
| 7043 | * us make sure we don't allow a log commit to come in after |
| 7044 | * we unlink the name but before we add the new name back in. |
| 7045 | */ |
| 7046 | btrfs_pin_log_trans(root); |
| 7047 | } |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 7048 | /* |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7049 | * make sure the inode gets flushed if it is replacing |
| 7050 | * something. |
| 7051 | */ |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7052 | 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] | 7053 | btrfs_add_ordered_operation(trans, root, old_inode); |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 7054 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7055 | old_dir->i_ctime = old_dir->i_mtime = ctime; |
| 7056 | new_dir->i_ctime = new_dir->i_mtime = ctime; |
| 7057 | old_inode->i_ctime = ctime; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7058 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 7059 | if (old_dentry->d_parent != new_dentry->d_parent) |
| 7060 | btrfs_record_unlink_dir(trans, old_dir, old_inode, 1); |
| 7061 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7062 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7063 | root_objectid = BTRFS_I(old_inode)->root->root_key.objectid; |
| 7064 | ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid, |
| 7065 | old_dentry->d_name.name, |
| 7066 | old_dentry->d_name.len); |
| 7067 | } else { |
Al Viro | 9298679 | 2011-03-04 17:14:37 +0000 | [diff] [blame] | 7068 | ret = __btrfs_unlink_inode(trans, root, old_dir, |
| 7069 | old_dentry->d_inode, |
| 7070 | old_dentry->d_name.name, |
| 7071 | old_dentry->d_name.len); |
| 7072 | if (!ret) |
| 7073 | ret = btrfs_update_inode(trans, root, old_inode); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7074 | } |
| 7075 | BUG_ON(ret); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7076 | |
| 7077 | if (new_inode) { |
| 7078 | new_inode->i_ctime = CURRENT_TIME; |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7079 | if (unlikely(btrfs_ino(new_inode) == |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7080 | BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
| 7081 | root_objectid = BTRFS_I(new_inode)->location.objectid; |
| 7082 | ret = btrfs_unlink_subvol(trans, dest, new_dir, |
| 7083 | root_objectid, |
| 7084 | new_dentry->d_name.name, |
| 7085 | new_dentry->d_name.len); |
| 7086 | BUG_ON(new_inode->i_nlink == 0); |
| 7087 | } else { |
| 7088 | ret = btrfs_unlink_inode(trans, dest, new_dir, |
| 7089 | new_dentry->d_inode, |
| 7090 | new_dentry->d_name.name, |
| 7091 | new_dentry->d_name.len); |
| 7092 | } |
| 7093 | BUG_ON(ret); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 7094 | if (new_inode->i_nlink == 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7095 | ret = btrfs_orphan_add(trans, new_dentry->d_inode); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7096 | BUG_ON(ret); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 7097 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7098 | } |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 7099 | |
Liu Bo | 75e7cb7 | 2011-03-22 10:12:20 +0000 | [diff] [blame] | 7100 | fixup_inode_flags(new_dir, old_inode); |
| 7101 | |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7102 | ret = btrfs_add_link(trans, new_dir, old_inode, |
| 7103 | new_dentry->d_name.name, |
Yan, Zheng | a571952 | 2009-09-24 09:17:31 -0400 | [diff] [blame] | 7104 | new_dentry->d_name.len, 0, index); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7105 | BUG_ON(ret); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7106 | |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7107 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID) { |
Al Viro | 10d9f30 | 2011-07-16 23:09:10 -0400 | [diff] [blame] | 7108 | struct dentry *parent = new_dentry->d_parent; |
Josef Bacik | 6a91221 | 2010-11-20 09:48:00 +0000 | [diff] [blame] | 7109 | btrfs_log_new_name(trans, old_inode, old_dir, parent); |
Yan, Zheng | 4df27c4d | 2009-09-21 15:56:00 -0400 | [diff] [blame] | 7110 | btrfs_end_log_trans(root); |
| 7111 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7112 | out_fail: |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 7113 | btrfs_end_transaction(trans, root); |
Johann Lombardi | b44c59a | 2011-03-31 13:23:47 +0000 | [diff] [blame] | 7114 | out_notrans: |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7115 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7116 | up_read(&root->fs_info->subvol_sem); |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 7117 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7118 | return ret; |
| 7119 | } |
| 7120 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 7121 | /* |
| 7122 | * some fairly slow code that needs optimization. This walks the list |
| 7123 | * of all the inodes with pending delalloc and forces them to disk. |
| 7124 | */ |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 7125 | int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput) |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 7126 | { |
| 7127 | struct list_head *head = &root->fs_info->delalloc_inodes; |
| 7128 | struct btrfs_inode *binode; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 7129 | struct inode *inode; |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 7130 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 7131 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
| 7132 | return -EROFS; |
| 7133 | |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 7134 | spin_lock(&root->fs_info->delalloc_lock); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 7135 | while (!list_empty(head)) { |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 7136 | binode = list_entry(head->next, struct btrfs_inode, |
| 7137 | delalloc_inodes); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 7138 | inode = igrab(&binode->vfs_inode); |
| 7139 | if (!inode) |
| 7140 | list_del_init(&binode->delalloc_inodes); |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 7141 | spin_unlock(&root->fs_info->delalloc_lock); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 7142 | if (inode) { |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 7143 | filemap_flush(inode->i_mapping); |
Yan, Zheng | 24bbcf0 | 2009-11-12 09:36:34 +0000 | [diff] [blame] | 7144 | if (delay_iput) |
| 7145 | btrfs_add_delayed_iput(inode); |
| 7146 | else |
| 7147 | iput(inode); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 7148 | } |
| 7149 | cond_resched(); |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 7150 | spin_lock(&root->fs_info->delalloc_lock); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 7151 | } |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 7152 | spin_unlock(&root->fs_info->delalloc_lock); |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 7153 | |
| 7154 | /* the filemap_flush will queue IO into the worker threads, but |
| 7155 | * we have to make sure the IO is actually started and that |
| 7156 | * ordered extents get created before we return |
| 7157 | */ |
| 7158 | atomic_inc(&root->fs_info->async_submit_draining); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 7159 | while (atomic_read(&root->fs_info->nr_async_submits) || |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 7160 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 7161 | wait_event(root->fs_info->async_submit_wait, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 7162 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
| 7163 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 7164 | } |
| 7165 | atomic_dec(&root->fs_info->async_submit_draining); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 7166 | return 0; |
| 7167 | } |
| 7168 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7169 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
| 7170 | const char *symname) |
| 7171 | { |
| 7172 | struct btrfs_trans_handle *trans; |
| 7173 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 7174 | struct btrfs_path *path; |
| 7175 | struct btrfs_key key; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 7176 | struct inode *inode = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7177 | int err; |
| 7178 | int drop_inode = 0; |
| 7179 | u64 objectid; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 7180 | u64 index = 0 ; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7181 | int name_len; |
| 7182 | int datasize; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7183 | unsigned long ptr; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7184 | struct btrfs_file_extent_item *ei; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7185 | struct extent_buffer *leaf; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 7186 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7187 | |
| 7188 | name_len = strlen(symname) + 1; |
| 7189 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) |
| 7190 | return -ENAMETOOLONG; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 7191 | |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 7192 | /* |
| 7193 | * 2 items for inode item and ref |
| 7194 | * 2 items for dir items |
| 7195 | * 1 item for xattr if selinux is on |
| 7196 | */ |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 7197 | trans = btrfs_start_transaction(root, 5); |
| 7198 | if (IS_ERR(trans)) |
| 7199 | return PTR_ERR(trans); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 7200 | |
Li Zefan | 581bb05 | 2011-04-20 10:06:11 +0800 | [diff] [blame] | 7201 | err = btrfs_find_free_ino(root, &objectid); |
| 7202 | if (err) |
| 7203 | goto out_unlock; |
| 7204 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 7205 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7206 | dentry->d_name.len, btrfs_ino(dir), objectid, |
Josef Bacik | d82a6f1 | 2011-05-11 15:26:06 -0400 | [diff] [blame] | 7207 | S_IFLNK|S_IRWXUGO, &index); |
Tsutomu Itoh | 7cf96da | 2011-04-25 19:43:53 -0400 | [diff] [blame] | 7208 | if (IS_ERR(inode)) { |
| 7209 | err = PTR_ERR(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7210 | goto out_unlock; |
Tsutomu Itoh | 7cf96da | 2011-04-25 19:43:53 -0400 | [diff] [blame] | 7211 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7212 | |
Eric Paris | 2a7dba3 | 2011-02-01 11:05:39 -0500 | [diff] [blame] | 7213 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 7214 | if (err) { |
| 7215 | drop_inode = 1; |
| 7216 | goto out_unlock; |
| 7217 | } |
| 7218 | |
Casey Schaufler | ad19db7 | 2011-12-15 10:09:07 -0500 | [diff] [blame] | 7219 | /* |
| 7220 | * If the active LSM wants to access the inode during |
| 7221 | * d_instantiate it needs these. Smack checks to see |
| 7222 | * if the filesystem supports xattrs by looking at the |
| 7223 | * ops vector. |
| 7224 | */ |
| 7225 | inode->i_fop = &btrfs_file_operations; |
| 7226 | inode->i_op = &btrfs_file_inode_operations; |
| 7227 | |
Josef Bacik | a1b075d | 2010-11-19 20:36:11 +0000 | [diff] [blame] | 7228 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7229 | if (err) |
| 7230 | drop_inode = 1; |
| 7231 | else { |
| 7232 | inode->i_mapping->a_ops = &btrfs_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 7233 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 7234 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7235 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7236 | if (drop_inode) |
| 7237 | goto out_unlock; |
| 7238 | |
| 7239 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 7240 | if (!path) { |
| 7241 | err = -ENOMEM; |
| 7242 | drop_inode = 1; |
| 7243 | goto out_unlock; |
| 7244 | } |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 7245 | key.objectid = btrfs_ino(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7246 | key.offset = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7247 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
| 7248 | datasize = btrfs_file_extent_calc_inline_size(name_len); |
| 7249 | err = btrfs_insert_empty_item(trans, root, path, &key, |
| 7250 | datasize); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 7251 | if (err) { |
| 7252 | drop_inode = 1; |
Julia Lawall | b083916 | 2011-05-14 07:10:51 +0000 | [diff] [blame] | 7253 | btrfs_free_path(path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 7254 | goto out_unlock; |
| 7255 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7256 | leaf = path->nodes[0]; |
| 7257 | ei = btrfs_item_ptr(leaf, path->slots[0], |
| 7258 | struct btrfs_file_extent_item); |
| 7259 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); |
| 7260 | btrfs_set_file_extent_type(leaf, ei, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7261 | BTRFS_FILE_EXTENT_INLINE); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 7262 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
| 7263 | btrfs_set_file_extent_compression(leaf, ei, 0); |
| 7264 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); |
| 7265 | btrfs_set_file_extent_ram_bytes(leaf, ei, name_len); |
| 7266 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7267 | ptr = btrfs_file_extent_inline_start(ei); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7268 | write_extent_buffer(leaf, symname, ptr, name_len); |
| 7269 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7270 | btrfs_free_path(path); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 7271 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7272 | inode->i_op = &btrfs_symlink_inode_operations; |
| 7273 | inode->i_mapping->a_ops = &btrfs_symlink_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 7274 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7275 | inode_set_bytes(inode, name_len); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 7276 | btrfs_i_size_write(inode, name_len - 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 7277 | err = btrfs_update_inode(trans, root, inode); |
| 7278 | if (err) |
| 7279 | drop_inode = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7280 | |
| 7281 | out_unlock: |
Al Viro | 08c422c | 2011-12-23 07:58:13 -0500 | [diff] [blame] | 7282 | if (!err) |
| 7283 | d_instantiate(dentry, inode); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 7284 | nr = trans->blocks_used; |
Josef Bacik | 7ad85bb | 2012-01-12 19:10:12 -0500 | [diff] [blame] | 7285 | btrfs_end_transaction(trans, root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7286 | if (drop_inode) { |
| 7287 | inode_dec_link_count(inode); |
| 7288 | iput(inode); |
| 7289 | } |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 7290 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7291 | return err; |
| 7292 | } |
Chris Mason | 1643298 | 2008-04-10 10:23:21 -0400 | [diff] [blame] | 7293 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7294 | static int __btrfs_prealloc_file_range(struct inode *inode, int mode, |
| 7295 | u64 start, u64 num_bytes, u64 min_size, |
| 7296 | loff_t actual_len, u64 *alloc_hint, |
| 7297 | struct btrfs_trans_handle *trans) |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7298 | { |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7299 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 7300 | struct btrfs_key ins; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7301 | u64 cur_offset = start; |
Josef Bacik | 55a61d1 | 2010-11-22 18:50:32 +0000 | [diff] [blame] | 7302 | u64 i_size; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7303 | int ret = 0; |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7304 | bool own_trans = true; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7305 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7306 | if (trans) |
| 7307 | own_trans = false; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7308 | while (num_bytes > 0) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7309 | if (own_trans) { |
| 7310 | trans = btrfs_start_transaction(root, 3); |
| 7311 | if (IS_ERR(trans)) { |
| 7312 | ret = PTR_ERR(trans); |
| 7313 | break; |
| 7314 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7315 | } |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7316 | |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 7317 | ret = btrfs_reserve_extent(trans, root, num_bytes, min_size, |
| 7318 | 0, *alloc_hint, (u64)-1, &ins, 1); |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7319 | if (ret) { |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7320 | if (own_trans) |
| 7321 | btrfs_end_transaction(trans, root); |
Yan, Zheng | a22285a | 2010-05-16 10:48:46 -0400 | [diff] [blame] | 7322 | break; |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7323 | } |
| 7324 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7325 | ret = insert_reserved_file_extent(trans, inode, |
| 7326 | cur_offset, ins.objectid, |
| 7327 | ins.offset, ins.offset, |
Yan, Zheng | 920bbbf | 2009-11-12 09:34:08 +0000 | [diff] [blame] | 7328 | ins.offset, 0, 0, 0, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7329 | BTRFS_FILE_EXTENT_PREALLOC); |
| 7330 | BUG_ON(ret); |
Chris Mason | a1ed835 | 2009-09-11 12:27:37 -0400 | [diff] [blame] | 7331 | btrfs_drop_extent_cache(inode, cur_offset, |
| 7332 | cur_offset + ins.offset -1, 0); |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7333 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7334 | num_bytes -= ins.offset; |
| 7335 | cur_offset += ins.offset; |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 7336 | *alloc_hint = ins.objectid + ins.offset; |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7337 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7338 | inode->i_ctime = CURRENT_TIME; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 7339 | BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7340 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
Yan, Zheng | efa5646 | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 7341 | (actual_len > inode->i_size) && |
| 7342 | (cur_offset > inode->i_size)) { |
Aneesh Kumar K.V | d1ea6a6 | 2010-01-20 07:28:54 +0000 | [diff] [blame] | 7343 | if (cur_offset > actual_len) |
Josef Bacik | 55a61d1 | 2010-11-22 18:50:32 +0000 | [diff] [blame] | 7344 | i_size = actual_len; |
Aneesh Kumar K.V | d1ea6a6 | 2010-01-20 07:28:54 +0000 | [diff] [blame] | 7345 | else |
Josef Bacik | 55a61d1 | 2010-11-22 18:50:32 +0000 | [diff] [blame] | 7346 | i_size = cur_offset; |
| 7347 | i_size_write(inode, i_size); |
| 7348 | btrfs_ordered_update_i_size(inode, i_size, NULL); |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7349 | } |
| 7350 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7351 | ret = btrfs_update_inode(trans, root, inode); |
| 7352 | BUG_ON(ret); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7353 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7354 | if (own_trans) |
| 7355 | btrfs_end_transaction(trans, root); |
Yan, Zheng | 5a303d5 | 2009-11-12 09:34:52 +0000 | [diff] [blame] | 7356 | } |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 7357 | return ret; |
| 7358 | } |
| 7359 | |
Josef Bacik | 0af3d00 | 2010-06-21 14:48:16 -0400 | [diff] [blame] | 7360 | int btrfs_prealloc_file_range(struct inode *inode, int mode, |
| 7361 | u64 start, u64 num_bytes, u64 min_size, |
| 7362 | loff_t actual_len, u64 *alloc_hint) |
| 7363 | { |
| 7364 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, |
| 7365 | min_size, actual_len, alloc_hint, |
| 7366 | NULL); |
| 7367 | } |
| 7368 | |
| 7369 | int btrfs_prealloc_file_range_trans(struct inode *inode, |
| 7370 | struct btrfs_trans_handle *trans, int mode, |
| 7371 | u64 start, u64 num_bytes, u64 min_size, |
| 7372 | loff_t actual_len, u64 *alloc_hint) |
| 7373 | { |
| 7374 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, |
| 7375 | min_size, actual_len, alloc_hint, trans); |
| 7376 | } |
| 7377 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7378 | static int btrfs_set_page_dirty(struct page *page) |
| 7379 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7380 | return __set_page_dirty_nobuffers(page); |
| 7381 | } |
| 7382 | |
Al Viro | 10556cb | 2011-06-20 19:28:19 -0400 | [diff] [blame] | 7383 | static int btrfs_permission(struct inode *inode, int mask) |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7384 | { |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 7385 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Jeff Mahoney | cb6db4e | 2011-08-15 17:27:21 +0000 | [diff] [blame] | 7386 | umode_t mode = inode->i_mode; |
Li Zefan | b83cc96 | 2010-12-20 16:04:08 +0800 | [diff] [blame] | 7387 | |
Jeff Mahoney | cb6db4e | 2011-08-15 17:27:21 +0000 | [diff] [blame] | 7388 | if (mask & MAY_WRITE && |
| 7389 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) { |
| 7390 | if (btrfs_root_readonly(root)) |
| 7391 | return -EROFS; |
| 7392 | if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) |
| 7393 | return -EACCES; |
| 7394 | } |
Al Viro | 2830ba7 | 2011-06-20 19:16:29 -0400 | [diff] [blame] | 7395 | return generic_permission(inode, mask); |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7396 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7397 | |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 7398 | static const struct inode_operations btrfs_dir_inode_operations = { |
Chris Mason | 3394e16 | 2008-11-17 20:42:26 -0500 | [diff] [blame] | 7399 | .getattr = btrfs_getattr, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7400 | .lookup = btrfs_lookup, |
| 7401 | .create = btrfs_create, |
| 7402 | .unlink = btrfs_unlink, |
| 7403 | .link = btrfs_link, |
| 7404 | .mkdir = btrfs_mkdir, |
| 7405 | .rmdir = btrfs_rmdir, |
| 7406 | .rename = btrfs_rename, |
| 7407 | .symlink = btrfs_symlink, |
| 7408 | .setattr = btrfs_setattr, |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 7409 | .mknod = btrfs_mknod, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 7410 | .setxattr = btrfs_setxattr, |
| 7411 | .getxattr = btrfs_getxattr, |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 7412 | .listxattr = btrfs_listxattr, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 7413 | .removexattr = btrfs_removexattr, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7414 | .permission = btrfs_permission, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 7415 | .get_acl = btrfs_get_acl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7416 | }; |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 7417 | static const struct inode_operations btrfs_dir_ro_inode_operations = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7418 | .lookup = btrfs_lookup, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7419 | .permission = btrfs_permission, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 7420 | .get_acl = btrfs_get_acl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7421 | }; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7422 | |
Alexey Dobriyan | 828c095 | 2009-10-01 15:43:56 -0700 | [diff] [blame] | 7423 | static const struct file_operations btrfs_dir_file_operations = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7424 | .llseek = generic_file_llseek, |
| 7425 | .read = generic_read_dir, |
David Woodhouse | cbdf5a2 | 2008-08-06 19:42:33 +0100 | [diff] [blame] | 7426 | .readdir = btrfs_real_readdir, |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 7427 | .unlocked_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7428 | #ifdef CONFIG_COMPAT |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 7429 | .compat_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7430 | #endif |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 7431 | .release = btrfs_release_file, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 7432 | .fsync = btrfs_sync_file, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7433 | }; |
| 7434 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 7435 | static struct extent_io_ops btrfs_extent_io_ops = { |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 7436 | .fill_delalloc = run_delalloc_range, |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 7437 | .submit_bio_hook = btrfs_submit_bio_hook, |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 7438 | .merge_bio_hook = btrfs_merge_bio_hook, |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 7439 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7440 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 7441 | .writepage_start_hook = btrfs_writepage_start_hook, |
Chris Mason | b0c68f8 | 2008-01-31 11:05:37 -0500 | [diff] [blame] | 7442 | .set_bit_hook = btrfs_set_bit_hook, |
| 7443 | .clear_bit_hook = btrfs_clear_bit_hook, |
Josef Bacik | 9ed74f2 | 2009-09-11 16:12:44 -0400 | [diff] [blame] | 7444 | .merge_extent_hook = btrfs_merge_extent_hook, |
| 7445 | .split_extent_hook = btrfs_split_extent_hook, |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 7446 | }; |
| 7447 | |
Chris Mason | 3505439 | 2009-01-21 13:11:13 -0500 | [diff] [blame] | 7448 | /* |
| 7449 | * btrfs doesn't support the bmap operation because swapfiles |
| 7450 | * use bmap to make a mapping of extents in the file. They assume |
| 7451 | * these extents won't change over the life of the file and they |
| 7452 | * use the bmap result to do IO directly to the drive. |
| 7453 | * |
| 7454 | * the btrfs bmap call would return logical addresses that aren't |
| 7455 | * suitable for IO and they also will change frequently as COW |
| 7456 | * operations happen. So, swapfile + btrfs == corruption. |
| 7457 | * |
| 7458 | * For now we're avoiding this by dropping bmap. |
| 7459 | */ |
Alexey Dobriyan | 7f09410 | 2009-09-21 17:01:10 -0700 | [diff] [blame] | 7460 | static const struct address_space_operations btrfs_aops = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7461 | .readpage = btrfs_readpage, |
| 7462 | .writepage = btrfs_writepage, |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 7463 | .writepages = btrfs_writepages, |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 7464 | .readpages = btrfs_readpages, |
Chris Mason | 1643298 | 2008-04-10 10:23:21 -0400 | [diff] [blame] | 7465 | .direct_IO = btrfs_direct_IO, |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 7466 | .invalidatepage = btrfs_invalidatepage, |
| 7467 | .releasepage = btrfs_releasepage, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 7468 | .set_page_dirty = btrfs_set_page_dirty, |
Andi Kleen | 465fdd9 | 2009-09-16 11:50:18 +0200 | [diff] [blame] | 7469 | .error_remove_page = generic_error_remove_page, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7470 | }; |
| 7471 | |
Alexey Dobriyan | 7f09410 | 2009-09-21 17:01:10 -0700 | [diff] [blame] | 7472 | static const struct address_space_operations btrfs_symlink_aops = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7473 | .readpage = btrfs_readpage, |
| 7474 | .writepage = btrfs_writepage, |
Chris Mason | 2bf5a72 | 2007-08-30 11:54:02 -0400 | [diff] [blame] | 7475 | .invalidatepage = btrfs_invalidatepage, |
| 7476 | .releasepage = btrfs_releasepage, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7477 | }; |
| 7478 | |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 7479 | static const struct inode_operations btrfs_file_inode_operations = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7480 | .getattr = btrfs_getattr, |
| 7481 | .setattr = btrfs_setattr, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 7482 | .setxattr = btrfs_setxattr, |
| 7483 | .getxattr = btrfs_getxattr, |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 7484 | .listxattr = btrfs_listxattr, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 7485 | .removexattr = btrfs_removexattr, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7486 | .permission = btrfs_permission, |
Yehuda Sadeh | 1506fcc | 2009-01-21 14:39:14 -0500 | [diff] [blame] | 7487 | .fiemap = btrfs_fiemap, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 7488 | .get_acl = btrfs_get_acl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7489 | }; |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 7490 | static const struct inode_operations btrfs_special_inode_operations = { |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 7491 | .getattr = btrfs_getattr, |
| 7492 | .setattr = btrfs_setattr, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7493 | .permission = btrfs_permission, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 7494 | .setxattr = btrfs_setxattr, |
| 7495 | .getxattr = btrfs_getxattr, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 7496 | .listxattr = btrfs_listxattr, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 7497 | .removexattr = btrfs_removexattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 7498 | .get_acl = btrfs_get_acl, |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 7499 | }; |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 7500 | static const struct inode_operations btrfs_symlink_inode_operations = { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7501 | .readlink = generic_readlink, |
| 7502 | .follow_link = page_follow_link_light, |
| 7503 | .put_link = page_put_link, |
Li Zefan | f209561 | 2010-11-19 02:05:24 +0000 | [diff] [blame] | 7504 | .getattr = btrfs_getattr, |
Josef Bacik | 22c44fe | 2011-11-30 10:45:38 -0500 | [diff] [blame] | 7505 | .setattr = btrfs_setattr, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 7506 | .permission = btrfs_permission, |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 7507 | .setxattr = btrfs_setxattr, |
| 7508 | .getxattr = btrfs_getxattr, |
| 7509 | .listxattr = btrfs_listxattr, |
| 7510 | .removexattr = btrfs_removexattr, |
Christoph Hellwig | 4e34e71 | 2011-07-23 17:37:31 +0200 | [diff] [blame] | 7511 | .get_acl = btrfs_get_acl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 7512 | }; |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7513 | |
Alexey Dobriyan | 82d339d | 2009-10-09 09:54:36 -0400 | [diff] [blame] | 7514 | const struct dentry_operations btrfs_dentry_operations = { |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7515 | .d_delete = btrfs_dentry_delete, |
Josef Bacik | b4aff1f | 2011-06-28 16:18:59 -0400 | [diff] [blame] | 7516 | .d_release = btrfs_dentry_release, |
Yan, Zheng | 76dda93 | 2009-09-21 16:00:26 -0400 | [diff] [blame] | 7517 | }; |