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> |
| 29 | #include <linux/smp_lock.h> |
| 30 | #include <linux/backing-dev.h> |
| 31 | #include <linux/mpage.h> |
| 32 | #include <linux/swap.h> |
| 33 | #include <linux/writeback.h> |
| 34 | #include <linux/statfs.h> |
| 35 | #include <linux/compat.h> |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 36 | #include <linux/bit_spinlock.h> |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 37 | #include <linux/xattr.h> |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 38 | #include <linux/posix_acl.h> |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 39 | #include <linux/falloc.h> |
Chris Mason | 4b4e25f | 2008-11-20 10:22:27 -0500 | [diff] [blame] | 40 | #include "compat.h" |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 41 | #include "ctree.h" |
| 42 | #include "disk-io.h" |
| 43 | #include "transaction.h" |
| 44 | #include "btrfs_inode.h" |
| 45 | #include "ioctl.h" |
| 46 | #include "print-tree.h" |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 47 | #include "volumes.h" |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 48 | #include "ordered-data.h" |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 49 | #include "xattr.h" |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 50 | #include "tree-log.h" |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 51 | #include "compression.h" |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 52 | #include "locking.h" |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 53 | |
| 54 | struct btrfs_iget_args { |
| 55 | u64 ino; |
| 56 | struct btrfs_root *root; |
| 57 | }; |
| 58 | |
| 59 | static struct inode_operations btrfs_dir_inode_operations; |
| 60 | static struct inode_operations btrfs_symlink_inode_operations; |
| 61 | static struct inode_operations btrfs_dir_ro_inode_operations; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 62 | static struct inode_operations btrfs_special_inode_operations; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 63 | static struct inode_operations btrfs_file_inode_operations; |
| 64 | static struct address_space_operations btrfs_aops; |
| 65 | static struct address_space_operations btrfs_symlink_aops; |
| 66 | static struct file_operations btrfs_dir_file_operations; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 67 | static struct extent_io_ops btrfs_extent_io_ops; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 68 | |
| 69 | static struct kmem_cache *btrfs_inode_cachep; |
| 70 | struct kmem_cache *btrfs_trans_handle_cachep; |
| 71 | struct kmem_cache *btrfs_transaction_cachep; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 72 | struct kmem_cache *btrfs_path_cachep; |
| 73 | |
| 74 | #define S_SHIFT 12 |
| 75 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { |
| 76 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, |
| 77 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, |
| 78 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, |
| 79 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, |
| 80 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, |
| 81 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, |
| 82 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, |
| 83 | }; |
| 84 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 85 | static void btrfs_truncate(struct inode *inode); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 86 | 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] | 87 | static noinline int cow_file_range(struct inode *inode, |
| 88 | struct page *locked_page, |
| 89 | u64 start, u64 end, int *page_started, |
| 90 | unsigned long *nr_written, int unlock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 91 | |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 92 | static int btrfs_init_inode_security(struct inode *inode, struct inode *dir) |
| 93 | { |
| 94 | int err; |
| 95 | |
| 96 | err = btrfs_init_acl(inode, dir); |
| 97 | if (!err) |
| 98 | err = btrfs_xattr_security_init(inode, dir); |
| 99 | return err; |
| 100 | } |
| 101 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 102 | /* |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 103 | * this does all the hard work for inserting an inline extent into |
| 104 | * the btree. The caller should have done a btrfs_drop_extents so that |
| 105 | * no overlapping inline items exist in the btree |
| 106 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 107 | static noinline int insert_inline_extent(struct btrfs_trans_handle *trans, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 108 | struct btrfs_root *root, struct inode *inode, |
| 109 | u64 start, size_t size, size_t compressed_size, |
| 110 | struct page **compressed_pages) |
| 111 | { |
| 112 | struct btrfs_key key; |
| 113 | struct btrfs_path *path; |
| 114 | struct extent_buffer *leaf; |
| 115 | struct page *page = NULL; |
| 116 | char *kaddr; |
| 117 | unsigned long ptr; |
| 118 | struct btrfs_file_extent_item *ei; |
| 119 | int err = 0; |
| 120 | int ret; |
| 121 | size_t cur_size = size; |
| 122 | size_t datasize; |
| 123 | unsigned long offset; |
| 124 | int use_compress = 0; |
| 125 | |
| 126 | if (compressed_size && compressed_pages) { |
| 127 | use_compress = 1; |
| 128 | cur_size = compressed_size; |
| 129 | } |
| 130 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 131 | path = btrfs_alloc_path(); |
| 132 | if (!path) |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 133 | return -ENOMEM; |
| 134 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 135 | path->leave_spinning = 1; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 136 | btrfs_set_trans_block_group(trans, inode); |
| 137 | |
| 138 | key.objectid = inode->i_ino; |
| 139 | key.offset = start; |
| 140 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 141 | datasize = btrfs_file_extent_calc_inline_size(cur_size); |
| 142 | |
| 143 | inode_add_bytes(inode, size); |
| 144 | ret = btrfs_insert_empty_item(trans, root, path, &key, |
| 145 | datasize); |
| 146 | BUG_ON(ret); |
| 147 | if (ret) { |
| 148 | err = ret; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 149 | goto fail; |
| 150 | } |
| 151 | leaf = path->nodes[0]; |
| 152 | ei = btrfs_item_ptr(leaf, path->slots[0], |
| 153 | struct btrfs_file_extent_item); |
| 154 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); |
| 155 | btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); |
| 156 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
| 157 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); |
| 158 | btrfs_set_file_extent_ram_bytes(leaf, ei, size); |
| 159 | ptr = btrfs_file_extent_inline_start(ei); |
| 160 | |
| 161 | if (use_compress) { |
| 162 | struct page *cpage; |
| 163 | int i = 0; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 164 | while (compressed_size > 0) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 165 | cpage = compressed_pages[i]; |
Chris Mason | 5b050f0 | 2008-11-11 09:34:41 -0500 | [diff] [blame] | 166 | cur_size = min_t(unsigned long, compressed_size, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 167 | PAGE_CACHE_SIZE); |
| 168 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 169 | kaddr = kmap_atomic(cpage, KM_USER0); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 170 | write_extent_buffer(leaf, kaddr, ptr, cur_size); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 171 | kunmap_atomic(kaddr, KM_USER0); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 172 | |
| 173 | i++; |
| 174 | ptr += cur_size; |
| 175 | compressed_size -= cur_size; |
| 176 | } |
| 177 | btrfs_set_file_extent_compression(leaf, ei, |
| 178 | BTRFS_COMPRESS_ZLIB); |
| 179 | } else { |
| 180 | page = find_get_page(inode->i_mapping, |
| 181 | start >> PAGE_CACHE_SHIFT); |
| 182 | btrfs_set_file_extent_compression(leaf, ei, 0); |
| 183 | kaddr = kmap_atomic(page, KM_USER0); |
| 184 | offset = start & (PAGE_CACHE_SIZE - 1); |
| 185 | write_extent_buffer(leaf, kaddr + offset, ptr, size); |
| 186 | kunmap_atomic(kaddr, KM_USER0); |
| 187 | page_cache_release(page); |
| 188 | } |
| 189 | btrfs_mark_buffer_dirty(leaf); |
| 190 | btrfs_free_path(path); |
| 191 | |
| 192 | BTRFS_I(inode)->disk_i_size = inode->i_size; |
| 193 | btrfs_update_inode(trans, root, inode); |
| 194 | return 0; |
| 195 | fail: |
| 196 | btrfs_free_path(path); |
| 197 | return err; |
| 198 | } |
| 199 | |
| 200 | |
| 201 | /* |
| 202 | * conditionally insert an inline extent into the file. This |
| 203 | * does the checks required to make sure the data is small enough |
| 204 | * to fit as an inline extent. |
| 205 | */ |
Chris Mason | 7f366cf | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 206 | static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 207 | struct btrfs_root *root, |
| 208 | struct inode *inode, u64 start, u64 end, |
| 209 | size_t compressed_size, |
| 210 | struct page **compressed_pages) |
| 211 | { |
| 212 | u64 isize = i_size_read(inode); |
| 213 | u64 actual_end = min(end + 1, isize); |
| 214 | u64 inline_len = actual_end - start; |
| 215 | u64 aligned_end = (end + root->sectorsize - 1) & |
| 216 | ~((u64)root->sectorsize - 1); |
| 217 | u64 hint_byte; |
| 218 | u64 data_len = inline_len; |
| 219 | int ret; |
| 220 | |
| 221 | if (compressed_size) |
| 222 | data_len = compressed_size; |
| 223 | |
| 224 | if (start > 0 || |
Chris Mason | 70b99e6 | 2008-10-31 12:46:39 -0400 | [diff] [blame] | 225 | actual_end >= PAGE_CACHE_SIZE || |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 226 | data_len >= BTRFS_MAX_INLINE_DATA_SIZE(root) || |
| 227 | (!compressed_size && |
| 228 | (actual_end & (root->sectorsize - 1)) == 0) || |
| 229 | end + 1 < isize || |
| 230 | data_len > root->fs_info->max_inline) { |
| 231 | return 1; |
| 232 | } |
| 233 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 234 | ret = btrfs_drop_extents(trans, root, inode, start, |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 235 | aligned_end, aligned_end, start, &hint_byte); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 236 | BUG_ON(ret); |
| 237 | |
| 238 | if (isize > actual_end) |
| 239 | inline_len = min_t(u64, isize, actual_end); |
| 240 | ret = insert_inline_extent(trans, root, inode, start, |
| 241 | inline_len, compressed_size, |
| 242 | compressed_pages); |
| 243 | BUG_ON(ret); |
| 244 | btrfs_drop_extent_cache(inode, start, aligned_end, 0); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 245 | return 0; |
| 246 | } |
| 247 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 248 | struct async_extent { |
| 249 | u64 start; |
| 250 | u64 ram_size; |
| 251 | u64 compressed_size; |
| 252 | struct page **pages; |
| 253 | unsigned long nr_pages; |
| 254 | struct list_head list; |
| 255 | }; |
| 256 | |
| 257 | struct async_cow { |
| 258 | struct inode *inode; |
| 259 | struct btrfs_root *root; |
| 260 | struct page *locked_page; |
| 261 | u64 start; |
| 262 | u64 end; |
| 263 | struct list_head extents; |
| 264 | struct btrfs_work work; |
| 265 | }; |
| 266 | |
| 267 | static noinline int add_async_extent(struct async_cow *cow, |
| 268 | u64 start, u64 ram_size, |
| 269 | u64 compressed_size, |
| 270 | struct page **pages, |
| 271 | unsigned long nr_pages) |
| 272 | { |
| 273 | struct async_extent *async_extent; |
| 274 | |
| 275 | async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS); |
| 276 | async_extent->start = start; |
| 277 | async_extent->ram_size = ram_size; |
| 278 | async_extent->compressed_size = compressed_size; |
| 279 | async_extent->pages = pages; |
| 280 | async_extent->nr_pages = nr_pages; |
| 281 | list_add_tail(&async_extent->list, &cow->extents); |
| 282 | return 0; |
| 283 | } |
| 284 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 285 | /* |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 286 | * we create compressed extents in two phases. The first |
| 287 | * phase compresses a range of pages that have already been |
| 288 | * locked (both pages and state bits are locked). |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 289 | * |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 290 | * This is done inside an ordered work queue, and the compression |
| 291 | * is spread across many cpus. The actual IO submission is step |
| 292 | * two, and the ordered work queue takes care of making sure that |
| 293 | * happens in the same order things were put onto the queue by |
| 294 | * writepages and friends. |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 295 | * |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 296 | * If this code finds it can't get good compression, it puts an |
| 297 | * entry onto the work queue to write the uncompressed bytes. This |
| 298 | * makes sure that both compressed inodes and uncompressed inodes |
| 299 | * are written in the same order that pdflush sent them down. |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 300 | */ |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 301 | static noinline int compress_file_range(struct inode *inode, |
| 302 | struct page *locked_page, |
| 303 | u64 start, u64 end, |
| 304 | struct async_cow *async_cow, |
| 305 | int *num_added) |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 306 | { |
| 307 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 308 | struct btrfs_trans_handle *trans; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 309 | u64 num_bytes; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 310 | u64 orig_start; |
| 311 | u64 disk_num_bytes; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 312 | u64 blocksize = root->sectorsize; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 313 | u64 actual_end; |
Chris Mason | 42dc7ba | 2008-12-15 11:44:56 -0500 | [diff] [blame] | 314 | u64 isize = i_size_read(inode); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 315 | int ret = 0; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 316 | struct page **pages = NULL; |
| 317 | unsigned long nr_pages; |
| 318 | unsigned long nr_pages_ret = 0; |
| 319 | unsigned long total_compressed = 0; |
| 320 | unsigned long total_in = 0; |
| 321 | unsigned long max_compressed = 128 * 1024; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 322 | unsigned long max_uncompressed = 128 * 1024; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 323 | int i; |
| 324 | int will_compress; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 325 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 326 | orig_start = start; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 327 | |
Chris Mason | 42dc7ba | 2008-12-15 11:44:56 -0500 | [diff] [blame] | 328 | actual_end = min_t(u64, isize, end + 1); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 329 | again: |
| 330 | will_compress = 0; |
| 331 | nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1; |
| 332 | nr_pages = min(nr_pages, (128 * 1024UL) / PAGE_CACHE_SIZE); |
| 333 | |
Chris Mason | f03d930 | 2009-02-04 09:31:06 -0500 | [diff] [blame] | 334 | /* |
| 335 | * we don't want to send crud past the end of i_size through |
| 336 | * compression, that's just a waste of CPU time. So, if the |
| 337 | * end of the file is before the start of our current |
| 338 | * requested range of bytes, we bail out to the uncompressed |
| 339 | * cleanup code that can deal with all of this. |
| 340 | * |
| 341 | * It isn't really the fastest way to fix things, but this is a |
| 342 | * very uncommon corner. |
| 343 | */ |
| 344 | if (actual_end <= start) |
| 345 | goto cleanup_and_bail_uncompressed; |
| 346 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 347 | total_compressed = actual_end - start; |
| 348 | |
| 349 | /* we want to make sure that amount of ram required to uncompress |
| 350 | * an extent is reasonable, so we limit the total size in ram |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 351 | * of a compressed extent to 128k. This is a crucial number |
| 352 | * because it also controls how easily we can spread reads across |
| 353 | * cpus for decompression. |
| 354 | * |
| 355 | * We also want to make sure the amount of IO required to do |
| 356 | * a random read is reasonably small, so we limit the size of |
| 357 | * a compressed extent to 128k. |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 358 | */ |
| 359 | total_compressed = min(total_compressed, max_uncompressed); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 360 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 361 | num_bytes = max(blocksize, num_bytes); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 362 | disk_num_bytes = num_bytes; |
| 363 | total_in = 0; |
| 364 | ret = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 365 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 366 | /* |
| 367 | * we do compression for mount -o compress and when the |
| 368 | * inode has not been flagged as nocompress. This flag can |
| 369 | * change at any time if we discover bad compression ratios. |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 370 | */ |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 371 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) && |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 372 | btrfs_test_opt(root, COMPRESS)) { |
| 373 | WARN_ON(pages); |
Chris Mason | cfbc246 | 2008-10-30 13:22:14 -0400 | [diff] [blame] | 374 | pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 375 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 376 | ret = btrfs_zlib_compress_pages(inode->i_mapping, start, |
| 377 | total_compressed, pages, |
| 378 | nr_pages, &nr_pages_ret, |
| 379 | &total_in, |
| 380 | &total_compressed, |
| 381 | max_compressed); |
| 382 | |
| 383 | if (!ret) { |
| 384 | unsigned long offset = total_compressed & |
| 385 | (PAGE_CACHE_SIZE - 1); |
| 386 | struct page *page = pages[nr_pages_ret - 1]; |
| 387 | char *kaddr; |
| 388 | |
| 389 | /* zero the tail end of the last page, we might be |
| 390 | * sending it down to disk |
| 391 | */ |
| 392 | if (offset) { |
| 393 | kaddr = kmap_atomic(page, KM_USER0); |
| 394 | memset(kaddr + offset, 0, |
| 395 | PAGE_CACHE_SIZE - offset); |
| 396 | kunmap_atomic(kaddr, KM_USER0); |
| 397 | } |
| 398 | will_compress = 1; |
| 399 | } |
| 400 | } |
| 401 | if (start == 0) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 402 | trans = btrfs_join_transaction(root, 1); |
| 403 | BUG_ON(!trans); |
| 404 | btrfs_set_trans_block_group(trans, inode); |
| 405 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 406 | /* lets try to make an inline extent */ |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 407 | if (ret || total_in < (actual_end - start)) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 408 | /* we didn't compress the entire range, try |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 409 | * to make an uncompressed inline extent. |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 410 | */ |
| 411 | ret = cow_file_range_inline(trans, root, inode, |
| 412 | start, end, 0, NULL); |
| 413 | } else { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 414 | /* try making a compressed inline extent */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 415 | ret = cow_file_range_inline(trans, root, inode, |
| 416 | start, end, |
| 417 | total_compressed, pages); |
| 418 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 419 | btrfs_end_transaction(trans, root); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 420 | if (ret == 0) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 421 | /* |
| 422 | * inline extent creation worked, we don't need |
| 423 | * to create any more async work items. Unlock |
| 424 | * and free up our temp pages. |
| 425 | */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 426 | extent_clear_unlock_delalloc(inode, |
| 427 | &BTRFS_I(inode)->io_tree, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 428 | start, end, NULL, 1, 0, |
| 429 | 0, 1, 1, 1); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 430 | ret = 0; |
| 431 | goto free_pages_out; |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | if (will_compress) { |
| 436 | /* |
| 437 | * we aren't doing an inline extent round the compressed size |
| 438 | * up to a block size boundary so the allocator does sane |
| 439 | * things |
| 440 | */ |
| 441 | total_compressed = (total_compressed + blocksize - 1) & |
| 442 | ~(blocksize - 1); |
| 443 | |
| 444 | /* |
| 445 | * one last check to make sure the compression is really a |
| 446 | * win, compare the page count read with the blocks on disk |
| 447 | */ |
| 448 | total_in = (total_in + PAGE_CACHE_SIZE - 1) & |
| 449 | ~(PAGE_CACHE_SIZE - 1); |
| 450 | if (total_compressed >= total_in) { |
| 451 | will_compress = 0; |
| 452 | } else { |
| 453 | disk_num_bytes = total_compressed; |
| 454 | num_bytes = total_in; |
| 455 | } |
| 456 | } |
| 457 | if (!will_compress && pages) { |
| 458 | /* |
| 459 | * the compression code ran but failed to make things smaller, |
| 460 | * free any pages it allocated and our page pointer array |
| 461 | */ |
| 462 | for (i = 0; i < nr_pages_ret; i++) { |
Chris Mason | 70b99e6 | 2008-10-31 12:46:39 -0400 | [diff] [blame] | 463 | WARN_ON(pages[i]->mapping); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 464 | page_cache_release(pages[i]); |
| 465 | } |
| 466 | kfree(pages); |
| 467 | pages = NULL; |
| 468 | total_compressed = 0; |
| 469 | nr_pages_ret = 0; |
| 470 | |
| 471 | /* flag the file so we don't compress in the future */ |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 472 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 473 | } |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 474 | if (will_compress) { |
| 475 | *num_added += 1; |
| 476 | |
| 477 | /* the async work queues will take care of doing actual |
| 478 | * allocation on disk for these compressed pages, |
| 479 | * and will submit them to the elevator. |
| 480 | */ |
| 481 | add_async_extent(async_cow, start, num_bytes, |
| 482 | total_compressed, pages, nr_pages_ret); |
| 483 | |
Chris Mason | 42dc7ba | 2008-12-15 11:44:56 -0500 | [diff] [blame] | 484 | if (start + num_bytes < end && start + num_bytes < actual_end) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 485 | start += num_bytes; |
| 486 | pages = NULL; |
| 487 | cond_resched(); |
| 488 | goto again; |
| 489 | } |
| 490 | } else { |
Chris Mason | f03d930 | 2009-02-04 09:31:06 -0500 | [diff] [blame] | 491 | cleanup_and_bail_uncompressed: |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 492 | /* |
| 493 | * No compression, but we still need to write the pages in |
| 494 | * the file we've been given so far. redirty the locked |
| 495 | * page if it corresponds to our extent and set things up |
| 496 | * for the async work queue to run cow_file_range to do |
| 497 | * the normal delalloc dance |
| 498 | */ |
| 499 | if (page_offset(locked_page) >= start && |
| 500 | page_offset(locked_page) <= end) { |
| 501 | __set_page_dirty_nobuffers(locked_page); |
| 502 | /* unlocked later on in the async handlers */ |
| 503 | } |
| 504 | add_async_extent(async_cow, start, end - start + 1, 0, NULL, 0); |
| 505 | *num_added += 1; |
| 506 | } |
| 507 | |
| 508 | out: |
| 509 | return 0; |
| 510 | |
| 511 | free_pages_out: |
| 512 | for (i = 0; i < nr_pages_ret; i++) { |
| 513 | WARN_ON(pages[i]->mapping); |
| 514 | page_cache_release(pages[i]); |
| 515 | } |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 516 | kfree(pages); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 517 | |
| 518 | goto out; |
| 519 | } |
| 520 | |
| 521 | /* |
| 522 | * phase two of compressed writeback. This is the ordered portion |
| 523 | * of the code, which only gets called in the order the work was |
| 524 | * queued. We walk all the async extents created by compress_file_range |
| 525 | * and send them down to the disk. |
| 526 | */ |
| 527 | static noinline int submit_compressed_extents(struct inode *inode, |
| 528 | struct async_cow *async_cow) |
| 529 | { |
| 530 | struct async_extent *async_extent; |
| 531 | u64 alloc_hint = 0; |
| 532 | struct btrfs_trans_handle *trans; |
| 533 | struct btrfs_key ins; |
| 534 | struct extent_map *em; |
| 535 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 536 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 537 | struct extent_io_tree *io_tree; |
| 538 | int ret; |
| 539 | |
| 540 | if (list_empty(&async_cow->extents)) |
| 541 | return 0; |
| 542 | |
| 543 | trans = btrfs_join_transaction(root, 1); |
| 544 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 545 | while (!list_empty(&async_cow->extents)) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 546 | async_extent = list_entry(async_cow->extents.next, |
| 547 | struct async_extent, list); |
| 548 | list_del(&async_extent->list); |
| 549 | |
| 550 | io_tree = &BTRFS_I(inode)->io_tree; |
| 551 | |
| 552 | /* did the compression code fall back to uncompressed IO? */ |
| 553 | if (!async_extent->pages) { |
| 554 | int page_started = 0; |
| 555 | unsigned long nr_written = 0; |
| 556 | |
| 557 | lock_extent(io_tree, async_extent->start, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 558 | async_extent->start + |
| 559 | async_extent->ram_size - 1, GFP_NOFS); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 560 | |
| 561 | /* allocate blocks */ |
| 562 | cow_file_range(inode, async_cow->locked_page, |
| 563 | async_extent->start, |
| 564 | async_extent->start + |
| 565 | async_extent->ram_size - 1, |
| 566 | &page_started, &nr_written, 0); |
| 567 | |
| 568 | /* |
| 569 | * if page_started, cow_file_range inserted an |
| 570 | * inline extent and took care of all the unlocking |
| 571 | * and IO for us. Otherwise, we need to submit |
| 572 | * all those pages down to the drive. |
| 573 | */ |
| 574 | if (!page_started) |
| 575 | extent_write_locked_range(io_tree, |
| 576 | inode, async_extent->start, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 577 | async_extent->start + |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 578 | async_extent->ram_size - 1, |
| 579 | btrfs_get_extent, |
| 580 | WB_SYNC_ALL); |
| 581 | kfree(async_extent); |
| 582 | cond_resched(); |
| 583 | continue; |
| 584 | } |
| 585 | |
| 586 | lock_extent(io_tree, async_extent->start, |
| 587 | async_extent->start + async_extent->ram_size - 1, |
| 588 | GFP_NOFS); |
| 589 | /* |
| 590 | * here we're doing allocation and writeback of the |
| 591 | * compressed pages |
| 592 | */ |
| 593 | btrfs_drop_extent_cache(inode, async_extent->start, |
| 594 | async_extent->start + |
| 595 | async_extent->ram_size - 1, 0); |
| 596 | |
| 597 | ret = btrfs_reserve_extent(trans, root, |
| 598 | async_extent->compressed_size, |
| 599 | async_extent->compressed_size, |
| 600 | 0, alloc_hint, |
| 601 | (u64)-1, &ins, 1); |
| 602 | BUG_ON(ret); |
| 603 | em = alloc_extent_map(GFP_NOFS); |
| 604 | em->start = async_extent->start; |
| 605 | em->len = async_extent->ram_size; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 606 | em->orig_start = em->start; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 607 | |
| 608 | em->block_start = ins.objectid; |
| 609 | em->block_len = ins.offset; |
| 610 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
| 611 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
| 612 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
| 613 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 614 | while (1) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 615 | spin_lock(&em_tree->lock); |
| 616 | ret = add_extent_mapping(em_tree, em); |
| 617 | spin_unlock(&em_tree->lock); |
| 618 | if (ret != -EEXIST) { |
| 619 | free_extent_map(em); |
| 620 | break; |
| 621 | } |
| 622 | btrfs_drop_extent_cache(inode, async_extent->start, |
| 623 | async_extent->start + |
| 624 | async_extent->ram_size - 1, 0); |
| 625 | } |
| 626 | |
| 627 | ret = btrfs_add_ordered_extent(inode, async_extent->start, |
| 628 | ins.objectid, |
| 629 | async_extent->ram_size, |
| 630 | ins.offset, |
| 631 | BTRFS_ORDERED_COMPRESSED); |
| 632 | BUG_ON(ret); |
| 633 | |
| 634 | btrfs_end_transaction(trans, root); |
| 635 | |
| 636 | /* |
| 637 | * clear dirty, set writeback and unlock the pages. |
| 638 | */ |
| 639 | extent_clear_unlock_delalloc(inode, |
| 640 | &BTRFS_I(inode)->io_tree, |
| 641 | async_extent->start, |
| 642 | async_extent->start + |
| 643 | async_extent->ram_size - 1, |
| 644 | NULL, 1, 1, 0, 1, 1, 0); |
| 645 | |
| 646 | ret = btrfs_submit_compressed_write(inode, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 647 | async_extent->start, |
| 648 | async_extent->ram_size, |
| 649 | ins.objectid, |
| 650 | ins.offset, async_extent->pages, |
| 651 | async_extent->nr_pages); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 652 | |
| 653 | BUG_ON(ret); |
| 654 | trans = btrfs_join_transaction(root, 1); |
| 655 | alloc_hint = ins.objectid + ins.offset; |
| 656 | kfree(async_extent); |
| 657 | cond_resched(); |
| 658 | } |
| 659 | |
| 660 | btrfs_end_transaction(trans, root); |
| 661 | return 0; |
| 662 | } |
| 663 | |
| 664 | /* |
| 665 | * when extent_io.c finds a delayed allocation range in the file, |
| 666 | * the call backs end up in this code. The basic idea is to |
| 667 | * allocate extents on disk for the range, and create ordered data structs |
| 668 | * in ram to track those extents. |
| 669 | * |
| 670 | * locked_page is the page that writepage had locked already. We use |
| 671 | * it to make sure we don't do extra locks or unlocks. |
| 672 | * |
| 673 | * *page_started is set to one if we unlock locked_page and do everything |
| 674 | * required to start IO on it. It may be clean and already done with |
| 675 | * IO when we return. |
| 676 | */ |
| 677 | static noinline int cow_file_range(struct inode *inode, |
| 678 | struct page *locked_page, |
| 679 | u64 start, u64 end, int *page_started, |
| 680 | unsigned long *nr_written, |
| 681 | int unlock) |
| 682 | { |
| 683 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 684 | struct btrfs_trans_handle *trans; |
| 685 | u64 alloc_hint = 0; |
| 686 | u64 num_bytes; |
| 687 | unsigned long ram_size; |
| 688 | u64 disk_num_bytes; |
| 689 | u64 cur_alloc_size; |
| 690 | u64 blocksize = root->sectorsize; |
| 691 | u64 actual_end; |
Chris Mason | 42dc7ba | 2008-12-15 11:44:56 -0500 | [diff] [blame] | 692 | u64 isize = i_size_read(inode); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 693 | struct btrfs_key ins; |
| 694 | struct extent_map *em; |
| 695 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
| 696 | int ret = 0; |
| 697 | |
| 698 | trans = btrfs_join_transaction(root, 1); |
| 699 | BUG_ON(!trans); |
| 700 | btrfs_set_trans_block_group(trans, inode); |
| 701 | |
Chris Mason | 42dc7ba | 2008-12-15 11:44:56 -0500 | [diff] [blame] | 702 | actual_end = min_t(u64, isize, end + 1); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 703 | |
| 704 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
| 705 | num_bytes = max(blocksize, num_bytes); |
| 706 | disk_num_bytes = num_bytes; |
| 707 | ret = 0; |
| 708 | |
| 709 | if (start == 0) { |
| 710 | /* lets try to make an inline extent */ |
| 711 | ret = cow_file_range_inline(trans, root, inode, |
| 712 | start, end, 0, NULL); |
| 713 | if (ret == 0) { |
| 714 | extent_clear_unlock_delalloc(inode, |
| 715 | &BTRFS_I(inode)->io_tree, |
| 716 | start, end, NULL, 1, 1, |
| 717 | 1, 1, 1, 1); |
| 718 | *nr_written = *nr_written + |
| 719 | (end - start + PAGE_CACHE_SIZE) / PAGE_CACHE_SIZE; |
| 720 | *page_started = 1; |
| 721 | ret = 0; |
| 722 | goto out; |
| 723 | } |
| 724 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 725 | |
| 726 | BUG_ON(disk_num_bytes > |
| 727 | btrfs_super_total_bytes(&root->fs_info->super_copy)); |
| 728 | |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 729 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 730 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 731 | while (disk_num_bytes > 0) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 732 | cur_alloc_size = min(disk_num_bytes, root->fs_info->max_extent); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 733 | ret = btrfs_reserve_extent(trans, root, cur_alloc_size, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 734 | root->sectorsize, 0, alloc_hint, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 735 | (u64)-1, &ins, 1); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 736 | BUG_ON(ret); |
| 737 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 738 | em = alloc_extent_map(GFP_NOFS); |
| 739 | em->start = start; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 740 | em->orig_start = em->start; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 741 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 742 | ram_size = ins.offset; |
| 743 | em->len = ins.offset; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 744 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 745 | em->block_start = ins.objectid; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 746 | em->block_len = ins.offset; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 747 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Chris Mason | 7f3c74f | 2008-07-18 12:01:11 -0400 | [diff] [blame] | 748 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 749 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 750 | while (1) { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 751 | spin_lock(&em_tree->lock); |
| 752 | ret = add_extent_mapping(em_tree, em); |
| 753 | spin_unlock(&em_tree->lock); |
| 754 | if (ret != -EEXIST) { |
| 755 | free_extent_map(em); |
| 756 | break; |
| 757 | } |
| 758 | btrfs_drop_extent_cache(inode, start, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 759 | start + ram_size - 1, 0); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 760 | } |
| 761 | |
Chris Mason | 98d20f6 | 2008-04-14 09:46:10 -0400 | [diff] [blame] | 762 | cur_alloc_size = ins.offset; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 763 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 764 | ram_size, cur_alloc_size, 0); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 765 | BUG_ON(ret); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 766 | |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 767 | if (root->root_key.objectid == |
| 768 | BTRFS_DATA_RELOC_TREE_OBJECTID) { |
| 769 | ret = btrfs_reloc_clone_csums(inode, start, |
| 770 | cur_alloc_size); |
| 771 | BUG_ON(ret); |
| 772 | } |
| 773 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 774 | if (disk_num_bytes < cur_alloc_size) |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 775 | break; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 776 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 777 | /* we're not doing compressed IO, don't unlock the first |
| 778 | * page (which the caller expects to stay locked), don't |
| 779 | * clear any dirty bits and don't set any writeback bits |
| 780 | */ |
| 781 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
| 782 | start, start + ram_size - 1, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 783 | locked_page, unlock, 1, |
| 784 | 1, 0, 0, 0); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 785 | disk_num_bytes -= cur_alloc_size; |
Chris Mason | c59f895 | 2007-12-17 20:14:04 -0500 | [diff] [blame] | 786 | num_bytes -= cur_alloc_size; |
| 787 | alloc_hint = ins.objectid + ins.offset; |
| 788 | start += cur_alloc_size; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 789 | } |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 790 | out: |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 791 | ret = 0; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 792 | btrfs_end_transaction(trans, root); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 793 | |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 794 | return ret; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 795 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 796 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 797 | /* |
| 798 | * work queue call back to started compression on a file and pages |
| 799 | */ |
| 800 | static noinline void async_cow_start(struct btrfs_work *work) |
| 801 | { |
| 802 | struct async_cow *async_cow; |
| 803 | int num_added = 0; |
| 804 | async_cow = container_of(work, struct async_cow, work); |
| 805 | |
| 806 | compress_file_range(async_cow->inode, async_cow->locked_page, |
| 807 | async_cow->start, async_cow->end, async_cow, |
| 808 | &num_added); |
| 809 | if (num_added == 0) |
| 810 | async_cow->inode = NULL; |
| 811 | } |
| 812 | |
| 813 | /* |
| 814 | * work queue call back to submit previously compressed pages |
| 815 | */ |
| 816 | static noinline void async_cow_submit(struct btrfs_work *work) |
| 817 | { |
| 818 | struct async_cow *async_cow; |
| 819 | struct btrfs_root *root; |
| 820 | unsigned long nr_pages; |
| 821 | |
| 822 | async_cow = container_of(work, struct async_cow, work); |
| 823 | |
| 824 | root = async_cow->root; |
| 825 | nr_pages = (async_cow->end - async_cow->start + PAGE_CACHE_SIZE) >> |
| 826 | PAGE_CACHE_SHIFT; |
| 827 | |
| 828 | atomic_sub(nr_pages, &root->fs_info->async_delalloc_pages); |
| 829 | |
| 830 | if (atomic_read(&root->fs_info->async_delalloc_pages) < |
| 831 | 5 * 1042 * 1024 && |
| 832 | waitqueue_active(&root->fs_info->async_submit_wait)) |
| 833 | wake_up(&root->fs_info->async_submit_wait); |
| 834 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 835 | if (async_cow->inode) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 836 | submit_compressed_extents(async_cow->inode, async_cow); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 837 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 838 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 839 | static noinline void async_cow_free(struct btrfs_work *work) |
| 840 | { |
| 841 | struct async_cow *async_cow; |
| 842 | async_cow = container_of(work, struct async_cow, work); |
| 843 | kfree(async_cow); |
| 844 | } |
| 845 | |
| 846 | static int cow_file_range_async(struct inode *inode, struct page *locked_page, |
| 847 | u64 start, u64 end, int *page_started, |
| 848 | unsigned long *nr_written) |
| 849 | { |
| 850 | struct async_cow *async_cow; |
| 851 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 852 | unsigned long nr_pages; |
| 853 | u64 cur_end; |
| 854 | int limit = 10 * 1024 * 1042; |
| 855 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 856 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED | |
| 857 | EXTENT_DELALLOC, 1, 0, GFP_NOFS); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 858 | while (start < end) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 859 | async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS); |
| 860 | async_cow->inode = inode; |
| 861 | async_cow->root = root; |
| 862 | async_cow->locked_page = locked_page; |
| 863 | async_cow->start = start; |
| 864 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 865 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 866 | cur_end = end; |
| 867 | else |
| 868 | cur_end = min(end, start + 512 * 1024 - 1); |
| 869 | |
| 870 | async_cow->end = cur_end; |
| 871 | INIT_LIST_HEAD(&async_cow->extents); |
| 872 | |
| 873 | async_cow->work.func = async_cow_start; |
| 874 | async_cow->work.ordered_func = async_cow_submit; |
| 875 | async_cow->work.ordered_free = async_cow_free; |
| 876 | async_cow->work.flags = 0; |
| 877 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 878 | nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >> |
| 879 | PAGE_CACHE_SHIFT; |
| 880 | atomic_add(nr_pages, &root->fs_info->async_delalloc_pages); |
| 881 | |
| 882 | btrfs_queue_worker(&root->fs_info->delalloc_workers, |
| 883 | &async_cow->work); |
| 884 | |
| 885 | if (atomic_read(&root->fs_info->async_delalloc_pages) > limit) { |
| 886 | wait_event(root->fs_info->async_submit_wait, |
| 887 | (atomic_read(&root->fs_info->async_delalloc_pages) < |
| 888 | limit)); |
| 889 | } |
| 890 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 891 | while (atomic_read(&root->fs_info->async_submit_draining) && |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 892 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
| 893 | wait_event(root->fs_info->async_submit_wait, |
| 894 | (atomic_read(&root->fs_info->async_delalloc_pages) == |
| 895 | 0)); |
| 896 | } |
| 897 | |
| 898 | *nr_written += nr_pages; |
| 899 | start = cur_end + 1; |
| 900 | } |
| 901 | *page_started = 1; |
| 902 | return 0; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 903 | } |
| 904 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 905 | static noinline int csum_exist_in_range(struct btrfs_root *root, |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 906 | u64 bytenr, u64 num_bytes) |
| 907 | { |
| 908 | int ret; |
| 909 | struct btrfs_ordered_sum *sums; |
| 910 | LIST_HEAD(list); |
| 911 | |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 912 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, bytenr, |
| 913 | bytenr + num_bytes - 1, &list); |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 914 | if (ret == 0 && list_empty(&list)) |
| 915 | return 0; |
| 916 | |
| 917 | while (!list_empty(&list)) { |
| 918 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); |
| 919 | list_del(&sums->list); |
| 920 | kfree(sums); |
| 921 | } |
| 922 | return 1; |
| 923 | } |
| 924 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 925 | /* |
| 926 | * when nowcow writeback call back. This checks for snapshots or COW copies |
| 927 | * of the extents that exist in the file, and COWs the file as required. |
| 928 | * |
| 929 | * If no cow copies or snapshots exist, we write directly to the existing |
| 930 | * blocks on disk |
| 931 | */ |
Chris Mason | 7f366cf | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 932 | static noinline int run_delalloc_nocow(struct inode *inode, |
| 933 | struct page *locked_page, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 934 | u64 start, u64 end, int *page_started, int force, |
| 935 | unsigned long *nr_written) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 936 | { |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 937 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 938 | struct btrfs_trans_handle *trans; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 939 | struct extent_buffer *leaf; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 940 | struct btrfs_path *path; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 941 | struct btrfs_file_extent_item *fi; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 942 | struct btrfs_key found_key; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 943 | u64 cow_start; |
| 944 | u64 cur_offset; |
| 945 | u64 extent_end; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 946 | u64 extent_offset; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 947 | u64 disk_bytenr; |
| 948 | u64 num_bytes; |
| 949 | int extent_type; |
| 950 | int ret; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 951 | int type; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 952 | int nocow; |
| 953 | int check_prev = 1; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 954 | |
| 955 | path = btrfs_alloc_path(); |
| 956 | BUG_ON(!path); |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 957 | trans = btrfs_join_transaction(root, 1); |
| 958 | BUG_ON(!trans); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 959 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 960 | cow_start = (u64)-1; |
| 961 | cur_offset = start; |
| 962 | while (1) { |
| 963 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, |
| 964 | cur_offset, 0); |
| 965 | BUG_ON(ret < 0); |
| 966 | if (ret > 0 && path->slots[0] > 0 && check_prev) { |
| 967 | leaf = path->nodes[0]; |
| 968 | btrfs_item_key_to_cpu(leaf, &found_key, |
| 969 | path->slots[0] - 1); |
| 970 | if (found_key.objectid == inode->i_ino && |
| 971 | found_key.type == BTRFS_EXTENT_DATA_KEY) |
| 972 | path->slots[0]--; |
| 973 | } |
| 974 | check_prev = 0; |
| 975 | next_slot: |
| 976 | leaf = path->nodes[0]; |
| 977 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 978 | ret = btrfs_next_leaf(root, path); |
| 979 | if (ret < 0) |
| 980 | BUG_ON(1); |
| 981 | if (ret > 0) |
| 982 | break; |
| 983 | leaf = path->nodes[0]; |
| 984 | } |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 985 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 986 | nocow = 0; |
| 987 | disk_bytenr = 0; |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 988 | num_bytes = 0; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 989 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 990 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 991 | if (found_key.objectid > inode->i_ino || |
| 992 | found_key.type > BTRFS_EXTENT_DATA_KEY || |
| 993 | found_key.offset > end) |
| 994 | break; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 995 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 996 | if (found_key.offset > cur_offset) { |
| 997 | extent_end = found_key.offset; |
| 998 | goto out_check; |
| 999 | } |
Chris Mason | c31f883 | 2008-01-08 15:46:31 -0500 | [diff] [blame] | 1000 | |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1001 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1002 | struct btrfs_file_extent_item); |
| 1003 | extent_type = btrfs_file_extent_type(leaf, fi); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1004 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1005 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
| 1006 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1007 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1008 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1009 | extent_end = found_key.offset + |
| 1010 | btrfs_file_extent_num_bytes(leaf, fi); |
| 1011 | if (extent_end <= start) { |
| 1012 | path->slots[0]++; |
| 1013 | goto next_slot; |
| 1014 | } |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1015 | if (disk_bytenr == 0) |
| 1016 | goto out_check; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1017 | if (btrfs_file_extent_compression(leaf, fi) || |
| 1018 | btrfs_file_extent_encryption(leaf, fi) || |
| 1019 | btrfs_file_extent_other_encoding(leaf, fi)) |
| 1020 | goto out_check; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1021 | if (extent_type == BTRFS_FILE_EXTENT_REG && !force) |
| 1022 | goto out_check; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 1023 | if (btrfs_extent_readonly(root, disk_bytenr)) |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1024 | goto out_check; |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1025 | if (btrfs_cross_ref_exist(trans, root, inode->i_ino, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1026 | found_key.offset - |
| 1027 | extent_offset, disk_bytenr)) |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1028 | goto out_check; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1029 | disk_bytenr += extent_offset; |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1030 | disk_bytenr += cur_offset - found_key.offset; |
| 1031 | num_bytes = min(end + 1, extent_end) - cur_offset; |
| 1032 | /* |
| 1033 | * force cow if csum exists in the range. |
| 1034 | * this ensure that csum for a given extent are |
| 1035 | * either valid or do not exist. |
| 1036 | */ |
| 1037 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) |
| 1038 | goto out_check; |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1039 | nocow = 1; |
| 1040 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
| 1041 | extent_end = found_key.offset + |
| 1042 | btrfs_file_extent_inline_len(leaf, fi); |
| 1043 | extent_end = ALIGN(extent_end, root->sectorsize); |
| 1044 | } else { |
| 1045 | BUG_ON(1); |
| 1046 | } |
| 1047 | out_check: |
| 1048 | if (extent_end <= start) { |
| 1049 | path->slots[0]++; |
| 1050 | goto next_slot; |
| 1051 | } |
| 1052 | if (!nocow) { |
| 1053 | if (cow_start == (u64)-1) |
| 1054 | cow_start = cur_offset; |
| 1055 | cur_offset = extent_end; |
| 1056 | if (cur_offset > end) |
| 1057 | break; |
| 1058 | path->slots[0]++; |
| 1059 | goto next_slot; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1060 | } |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1061 | |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1062 | btrfs_release_path(root, path); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1063 | if (cow_start != (u64)-1) { |
| 1064 | ret = cow_file_range(inode, locked_page, cow_start, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1065 | found_key.offset - 1, page_started, |
| 1066 | nr_written, 1); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1067 | BUG_ON(ret); |
| 1068 | cow_start = (u64)-1; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1069 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1070 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1071 | if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
| 1072 | struct extent_map *em; |
| 1073 | struct extent_map_tree *em_tree; |
| 1074 | em_tree = &BTRFS_I(inode)->extent_tree; |
| 1075 | em = alloc_extent_map(GFP_NOFS); |
| 1076 | em->start = cur_offset; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 1077 | em->orig_start = em->start; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1078 | em->len = num_bytes; |
| 1079 | em->block_len = num_bytes; |
| 1080 | em->block_start = disk_bytenr; |
| 1081 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
| 1082 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
| 1083 | while (1) { |
| 1084 | spin_lock(&em_tree->lock); |
| 1085 | ret = add_extent_mapping(em_tree, em); |
| 1086 | spin_unlock(&em_tree->lock); |
| 1087 | if (ret != -EEXIST) { |
| 1088 | free_extent_map(em); |
| 1089 | break; |
| 1090 | } |
| 1091 | btrfs_drop_extent_cache(inode, em->start, |
| 1092 | em->start + em->len - 1, 0); |
| 1093 | } |
| 1094 | type = BTRFS_ORDERED_PREALLOC; |
| 1095 | } else { |
| 1096 | type = BTRFS_ORDERED_NOCOW; |
| 1097 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1098 | |
| 1099 | ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1100 | num_bytes, num_bytes, type); |
| 1101 | BUG_ON(ret); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1102 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1103 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
| 1104 | cur_offset, cur_offset + num_bytes - 1, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1105 | locked_page, 1, 1, 1, 0, 0, 0); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1106 | cur_offset = extent_end; |
| 1107 | if (cur_offset > end) |
| 1108 | break; |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1109 | } |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1110 | btrfs_release_path(root, path); |
| 1111 | |
| 1112 | if (cur_offset <= end && cow_start == (u64)-1) |
| 1113 | cow_start = cur_offset; |
| 1114 | if (cow_start != (u64)-1) { |
| 1115 | ret = cow_file_range(inode, locked_page, cow_start, end, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1116 | page_started, nr_written, 1); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1117 | BUG_ON(ret); |
| 1118 | } |
| 1119 | |
| 1120 | ret = btrfs_end_transaction(trans, root); |
| 1121 | BUG_ON(ret); |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1122 | btrfs_free_path(path); |
Yan Zheng | 80ff385 | 2008-10-30 14:20:02 -0400 | [diff] [blame] | 1123 | return 0; |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1124 | } |
| 1125 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1126 | /* |
| 1127 | * extent_io.c call back to do delayed allocation processing |
| 1128 | */ |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1129 | static int run_delalloc_range(struct inode *inode, struct page *locked_page, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1130 | u64 start, u64 end, int *page_started, |
| 1131 | unsigned long *nr_written) |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1132 | { |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1133 | int ret; |
Chris Mason | 7f366cf | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1134 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | a213501 | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 1135 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 1136 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1137 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1138 | page_started, 1, nr_written); |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 1139 | else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC) |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1140 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1141 | page_started, 0, nr_written); |
Chris Mason | 7f366cf | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1142 | else if (!btrfs_test_opt(root, COMPRESS)) |
| 1143 | ret = cow_file_range(inode, locked_page, start, end, |
| 1144 | page_started, nr_written, 1); |
Chris Mason | be20aa9 | 2007-12-17 20:14:01 -0500 | [diff] [blame] | 1145 | else |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1146 | ret = cow_file_range_async(inode, locked_page, start, end, |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1147 | page_started, nr_written); |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1148 | return ret; |
| 1149 | } |
| 1150 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1151 | /* |
| 1152 | * extent_io.c set_bit_hook, used to track delayed allocation |
| 1153 | * bytes in this file, and to maintain the list of inodes that |
| 1154 | * have pending delalloc work to be done. |
| 1155 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1156 | static int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, |
Chris Mason | b0c68f8 | 2008-01-31 11:05:37 -0500 | [diff] [blame] | 1157 | unsigned long old, unsigned long bits) |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1158 | { |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1159 | /* |
| 1160 | * set_bit and clear bit hooks normally require _irqsave/restore |
| 1161 | * but in this case, we are only testeing for the DELALLOC |
| 1162 | * bit, which is only set or cleared with irqs on |
| 1163 | */ |
Chris Mason | b0c68f8 | 2008-01-31 11:05:37 -0500 | [diff] [blame] | 1164 | if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1165 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1166 | btrfs_delalloc_reserve_space(root, inode, end - start + 1); |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1167 | spin_lock(&root->fs_info->delalloc_lock); |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 1168 | BTRFS_I(inode)->delalloc_bytes += end - start + 1; |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1169 | root->fs_info->delalloc_bytes += end - start + 1; |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1170 | if (list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
| 1171 | list_add_tail(&BTRFS_I(inode)->delalloc_inodes, |
| 1172 | &root->fs_info->delalloc_inodes); |
| 1173 | } |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1174 | spin_unlock(&root->fs_info->delalloc_lock); |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1175 | } |
| 1176 | return 0; |
| 1177 | } |
| 1178 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1179 | /* |
| 1180 | * extent_io.c clear_bit_hook, see set_bit_hook for why |
| 1181 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1182 | static int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, |
Chris Mason | b0c68f8 | 2008-01-31 11:05:37 -0500 | [diff] [blame] | 1183 | unsigned long old, unsigned long bits) |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1184 | { |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1185 | /* |
| 1186 | * set_bit and clear bit hooks normally require _irqsave/restore |
| 1187 | * but in this case, we are only testeing for the DELALLOC |
| 1188 | * bit, which is only set or cleared with irqs on |
| 1189 | */ |
Chris Mason | b0c68f8 | 2008-01-31 11:05:37 -0500 | [diff] [blame] | 1190 | if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1191 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | bcbfce8 | 2008-04-22 13:26:47 -0400 | [diff] [blame] | 1192 | |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1193 | spin_lock(&root->fs_info->delalloc_lock); |
Chris Mason | b0c68f8 | 2008-01-31 11:05:37 -0500 | [diff] [blame] | 1194 | if (end - start + 1 > root->fs_info->delalloc_bytes) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1195 | printk(KERN_INFO "btrfs warning: delalloc account " |
| 1196 | "%llu %llu\n", |
| 1197 | (unsigned long long)end - start + 1, |
| 1198 | (unsigned long long) |
| 1199 | root->fs_info->delalloc_bytes); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1200 | btrfs_delalloc_free_space(root, inode, (u64)-1); |
Chris Mason | b0c68f8 | 2008-01-31 11:05:37 -0500 | [diff] [blame] | 1201 | root->fs_info->delalloc_bytes = 0; |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 1202 | BTRFS_I(inode)->delalloc_bytes = 0; |
Chris Mason | b0c68f8 | 2008-01-31 11:05:37 -0500 | [diff] [blame] | 1203 | } else { |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 1204 | btrfs_delalloc_free_space(root, inode, |
| 1205 | end - start + 1); |
Chris Mason | b0c68f8 | 2008-01-31 11:05:37 -0500 | [diff] [blame] | 1206 | root->fs_info->delalloc_bytes -= end - start + 1; |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 1207 | BTRFS_I(inode)->delalloc_bytes -= end - start + 1; |
Chris Mason | b0c68f8 | 2008-01-31 11:05:37 -0500 | [diff] [blame] | 1208 | } |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1209 | if (BTRFS_I(inode)->delalloc_bytes == 0 && |
| 1210 | !list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
| 1211 | list_del_init(&BTRFS_I(inode)->delalloc_inodes); |
| 1212 | } |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 1213 | spin_unlock(&root->fs_info->delalloc_lock); |
Chris Mason | 291d673 | 2008-01-29 15:55:23 -0500 | [diff] [blame] | 1214 | } |
| 1215 | return 0; |
| 1216 | } |
| 1217 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1218 | /* |
| 1219 | * extent_io.c merge_bio_hook, this must check the chunk tree to make sure |
| 1220 | * we don't create bios that span stripes or chunks |
| 1221 | */ |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1222 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1223 | size_t size, struct bio *bio, |
| 1224 | unsigned long bio_flags) |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1225 | { |
| 1226 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; |
| 1227 | struct btrfs_mapping_tree *map_tree; |
Chris Mason | a62b940 | 2008-10-03 16:31:08 -0400 | [diff] [blame] | 1228 | u64 logical = (u64)bio->bi_sector << 9; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1229 | u64 length = 0; |
| 1230 | u64 map_length; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1231 | int ret; |
| 1232 | |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1233 | if (bio_flags & EXTENT_BIO_COMPRESSED) |
| 1234 | return 0; |
| 1235 | |
Chris Mason | f2d8d74 | 2008-04-21 10:03:05 -0400 | [diff] [blame] | 1236 | length = bio->bi_size; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1237 | map_tree = &root->fs_info->mapping_tree; |
| 1238 | map_length = length; |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1239 | ret = btrfs_map_block(map_tree, READ, logical, |
Chris Mason | f188591 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1240 | &map_length, NULL, 0); |
Chris Mason | cea9e44 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1241 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1242 | if (map_length < length + size) |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1243 | return 1; |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 1244 | return 0; |
| 1245 | } |
| 1246 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1247 | /* |
| 1248 | * in order to insert checksums into the metadata in large chunks, |
| 1249 | * we wait until bio submission time. All the pages in the bio are |
| 1250 | * checksummed and sums are attached onto the ordered extent record. |
| 1251 | * |
| 1252 | * At IO completion time the cums attached on the ordered extent record |
| 1253 | * are inserted into the btree |
| 1254 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1255 | static int __btrfs_submit_bio_start(struct inode *inode, int rw, |
| 1256 | struct bio *bio, int mirror_num, |
| 1257 | unsigned long bio_flags) |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1258 | { |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1259 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1260 | int ret = 0; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 1261 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1262 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1263 | BUG_ON(ret); |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 1264 | return 0; |
| 1265 | } |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 1266 | |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 1267 | /* |
| 1268 | * in order to insert checksums into the metadata in large chunks, |
| 1269 | * we wait until bio submission time. All the pages in the bio are |
| 1270 | * checksummed and sums are attached onto the ordered extent record. |
| 1271 | * |
| 1272 | * At IO completion time the cums attached on the ordered extent record |
| 1273 | * are inserted into the btree |
| 1274 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1275 | static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 1276 | int mirror_num, unsigned long bio_flags) |
| 1277 | { |
| 1278 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 1279 | return btrfs_map_bio(root, rw, bio, mirror_num, 1); |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1280 | } |
| 1281 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1282 | /* |
Chris Mason | cad321a | 2008-12-17 14:51:42 -0500 | [diff] [blame] | 1283 | * extent_io.c submission hook. This does the right thing for csum calculation |
| 1284 | * on write, or reading the csums from the tree before a read |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1285 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1286 | static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1287 | int mirror_num, unsigned long bio_flags) |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1288 | { |
| 1289 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1290 | int ret = 0; |
Chris Mason | 19b9bdb | 2008-10-30 14:23:13 -0400 | [diff] [blame] | 1291 | int skip_sum; |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1292 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 1293 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
Chris Mason | cad321a | 2008-12-17 14:51:42 -0500 | [diff] [blame] | 1294 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1295 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); |
| 1296 | BUG_ON(ret); |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1297 | |
Chris Mason | 4d1b5fb | 2008-08-20 09:44:52 -0400 | [diff] [blame] | 1298 | if (!(rw & (1 << BIO_RW))) { |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1299 | if (bio_flags & EXTENT_BIO_COMPRESSED) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1300 | return btrfs_submit_compressed_read(inode, bio, |
| 1301 | mirror_num, bio_flags); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1302 | } else if (!skip_sum) |
| 1303 | btrfs_lookup_bio_sums(root, inode, bio, NULL); |
Chris Mason | 4d1b5fb | 2008-08-20 09:44:52 -0400 | [diff] [blame] | 1304 | goto mapit; |
Chris Mason | 19b9bdb | 2008-10-30 14:23:13 -0400 | [diff] [blame] | 1305 | } else if (!skip_sum) { |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1306 | /* csum items have already been cloned */ |
| 1307 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) |
| 1308 | goto mapit; |
Chris Mason | 19b9bdb | 2008-10-30 14:23:13 -0400 | [diff] [blame] | 1309 | /* we're doing a write, do the async checksumming */ |
| 1310 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
Chris Mason | 44b8bd7 | 2008-04-16 11:14:51 -0400 | [diff] [blame] | 1311 | inode, rw, bio, mirror_num, |
Chris Mason | 4a69a41 | 2008-11-06 22:03:00 -0500 | [diff] [blame] | 1312 | bio_flags, __btrfs_submit_bio_start, |
| 1313 | __btrfs_submit_bio_done); |
Chris Mason | 19b9bdb | 2008-10-30 14:23:13 -0400 | [diff] [blame] | 1314 | } |
| 1315 | |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 1316 | mapit: |
Chris Mason | 8b71284 | 2008-06-11 16:50:36 -0400 | [diff] [blame] | 1317 | return btrfs_map_bio(root, rw, bio, mirror_num, 0); |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 1318 | } |
Chris Mason | 6885f30 | 2008-02-20 16:11:05 -0500 | [diff] [blame] | 1319 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1320 | /* |
| 1321 | * given a list of ordered sums record them in the inode. This happens |
| 1322 | * at IO completion time based on sums calculated at bio submission time. |
| 1323 | */ |
Chris Mason | ba1da2f | 2008-07-17 12:54:15 -0400 | [diff] [blame] | 1324 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1325 | struct inode *inode, u64 file_offset, |
| 1326 | struct list_head *list) |
| 1327 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1328 | struct btrfs_ordered_sum *sum; |
| 1329 | |
| 1330 | btrfs_set_trans_block_group(trans, inode); |
Qinghuang Feng | c6e3087 | 2009-01-21 10:59:08 -0500 | [diff] [blame] | 1331 | |
| 1332 | list_for_each_entry(sum, list, list) { |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1333 | btrfs_csum_file_blocks(trans, |
| 1334 | BTRFS_I(inode)->root->fs_info->csum_root, sum); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1335 | } |
| 1336 | return 0; |
| 1337 | } |
| 1338 | |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1339 | int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end) |
| 1340 | { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1341 | if ((end & (PAGE_CACHE_SIZE - 1)) == 0) |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 1342 | WARN_ON(1); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1343 | return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end, |
| 1344 | GFP_NOFS); |
| 1345 | } |
| 1346 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1347 | /* see btrfs_writepage_start_hook for details on why this is required */ |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1348 | struct btrfs_writepage_fixup { |
| 1349 | struct page *page; |
| 1350 | struct btrfs_work work; |
| 1351 | }; |
| 1352 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1353 | static void btrfs_writepage_fixup_worker(struct btrfs_work *work) |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1354 | { |
| 1355 | struct btrfs_writepage_fixup *fixup; |
| 1356 | struct btrfs_ordered_extent *ordered; |
| 1357 | struct page *page; |
| 1358 | struct inode *inode; |
| 1359 | u64 page_start; |
| 1360 | u64 page_end; |
| 1361 | |
| 1362 | fixup = container_of(work, struct btrfs_writepage_fixup, work); |
| 1363 | page = fixup->page; |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1364 | again: |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1365 | lock_page(page); |
| 1366 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { |
| 1367 | ClearPageChecked(page); |
| 1368 | goto out_page; |
| 1369 | } |
| 1370 | |
| 1371 | inode = page->mapping->host; |
| 1372 | page_start = page_offset(page); |
| 1373 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; |
| 1374 | |
| 1375 | lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS); |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1376 | |
| 1377 | /* already ordered? We're done */ |
| 1378 | if (test_range_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
| 1379 | EXTENT_ORDERED, 0)) { |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1380 | goto out; |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 1381 | } |
| 1382 | |
| 1383 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 1384 | if (ordered) { |
| 1385 | unlock_extent(&BTRFS_I(inode)->io_tree, page_start, |
| 1386 | page_end, GFP_NOFS); |
| 1387 | unlock_page(page); |
| 1388 | btrfs_start_ordered_extent(inode, ordered, 1); |
| 1389 | goto again; |
| 1390 | } |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1391 | |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 1392 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1393 | ClearPageChecked(page); |
| 1394 | out: |
| 1395 | unlock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS); |
| 1396 | out_page: |
| 1397 | unlock_page(page); |
| 1398 | page_cache_release(page); |
| 1399 | } |
| 1400 | |
| 1401 | /* |
| 1402 | * There are a few paths in the higher layers of the kernel that directly |
| 1403 | * set the page dirty bit without asking the filesystem if it is a |
| 1404 | * good idea. This causes problems because we want to make sure COW |
| 1405 | * properly happens and the data=ordered rules are followed. |
| 1406 | * |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1407 | * 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] | 1408 | * hasn't been properly setup for IO. We kick off an async process |
| 1409 | * to fix it up. The async helper will wait for ordered extents, set |
| 1410 | * the delalloc bit and make it safe to write the page. |
| 1411 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1412 | 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] | 1413 | { |
| 1414 | struct inode *inode = page->mapping->host; |
| 1415 | struct btrfs_writepage_fixup *fixup; |
| 1416 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1417 | int ret; |
| 1418 | |
| 1419 | ret = test_range_bit(&BTRFS_I(inode)->io_tree, start, end, |
| 1420 | EXTENT_ORDERED, 0); |
| 1421 | if (ret) |
| 1422 | return 0; |
| 1423 | |
| 1424 | if (PageChecked(page)) |
| 1425 | return -EAGAIN; |
| 1426 | |
| 1427 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); |
| 1428 | if (!fixup) |
| 1429 | return -EAGAIN; |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 1430 | |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 1431 | SetPageChecked(page); |
| 1432 | page_cache_get(page); |
| 1433 | fixup->work.func = btrfs_writepage_fixup_worker; |
| 1434 | fixup->page = page; |
| 1435 | btrfs_queue_worker(&root->fs_info->fixup_workers, &fixup->work); |
| 1436 | return -EAGAIN; |
| 1437 | } |
| 1438 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1439 | static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, |
| 1440 | struct inode *inode, u64 file_pos, |
| 1441 | u64 disk_bytenr, u64 disk_num_bytes, |
| 1442 | u64 num_bytes, u64 ram_bytes, |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 1443 | u64 locked_end, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1444 | u8 compression, u8 encryption, |
| 1445 | u16 other_encoding, int extent_type) |
| 1446 | { |
| 1447 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1448 | struct btrfs_file_extent_item *fi; |
| 1449 | struct btrfs_path *path; |
| 1450 | struct extent_buffer *leaf; |
| 1451 | struct btrfs_key ins; |
| 1452 | u64 hint; |
| 1453 | int ret; |
| 1454 | |
| 1455 | path = btrfs_alloc_path(); |
| 1456 | BUG_ON(!path); |
| 1457 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 1458 | path->leave_spinning = 1; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1459 | ret = btrfs_drop_extents(trans, root, inode, file_pos, |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 1460 | file_pos + num_bytes, locked_end, |
| 1461 | file_pos, &hint); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1462 | BUG_ON(ret); |
| 1463 | |
| 1464 | ins.objectid = inode->i_ino; |
| 1465 | ins.offset = file_pos; |
| 1466 | ins.type = BTRFS_EXTENT_DATA_KEY; |
| 1467 | ret = btrfs_insert_empty_item(trans, root, path, &ins, sizeof(*fi)); |
| 1468 | BUG_ON(ret); |
| 1469 | leaf = path->nodes[0]; |
| 1470 | fi = btrfs_item_ptr(leaf, path->slots[0], |
| 1471 | struct btrfs_file_extent_item); |
| 1472 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); |
| 1473 | btrfs_set_file_extent_type(leaf, fi, extent_type); |
| 1474 | btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr); |
| 1475 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes); |
| 1476 | btrfs_set_file_extent_offset(leaf, fi, 0); |
| 1477 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); |
| 1478 | btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes); |
| 1479 | btrfs_set_file_extent_compression(leaf, fi, compression); |
| 1480 | btrfs_set_file_extent_encryption(leaf, fi, encryption); |
| 1481 | btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 1482 | |
| 1483 | btrfs_unlock_up_safe(path, 1); |
| 1484 | btrfs_set_lock_blocking(leaf); |
| 1485 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1486 | btrfs_mark_buffer_dirty(leaf); |
| 1487 | |
| 1488 | inode_add_bytes(inode, num_bytes); |
| 1489 | btrfs_drop_extent_cache(inode, file_pos, file_pos + num_bytes - 1, 0); |
| 1490 | |
| 1491 | ins.objectid = disk_bytenr; |
| 1492 | ins.offset = disk_num_bytes; |
| 1493 | ins.type = BTRFS_EXTENT_ITEM_KEY; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1494 | ret = btrfs_alloc_reserved_file_extent(trans, root, |
| 1495 | root->root_key.objectid, |
| 1496 | inode->i_ino, file_pos, &ins); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1497 | BUG_ON(ret); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1498 | btrfs_free_path(path); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 1499 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1500 | return 0; |
| 1501 | } |
| 1502 | |
Chris Mason | 5d13a98 | 2009-03-13 11:41:46 -0400 | [diff] [blame] | 1503 | /* |
| 1504 | * helper function for btrfs_finish_ordered_io, this |
| 1505 | * just reads in some of the csum leaves to prime them into ram |
| 1506 | * before we start the transaction. It limits the amount of btree |
| 1507 | * reads required while inside the transaction. |
| 1508 | */ |
| 1509 | static noinline void reada_csum(struct btrfs_root *root, |
| 1510 | struct btrfs_path *path, |
| 1511 | struct btrfs_ordered_extent *ordered_extent) |
| 1512 | { |
| 1513 | struct btrfs_ordered_sum *sum; |
| 1514 | u64 bytenr; |
| 1515 | |
| 1516 | sum = list_entry(ordered_extent->list.next, struct btrfs_ordered_sum, |
| 1517 | list); |
| 1518 | bytenr = sum->sums[0].bytenr; |
| 1519 | |
| 1520 | /* |
| 1521 | * we don't care about the results, the point of this search is |
| 1522 | * just to get the btree leaves into ram |
| 1523 | */ |
| 1524 | btrfs_lookup_csum(NULL, root->fs_info->csum_root, path, bytenr, 0); |
| 1525 | } |
| 1526 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1527 | /* as ordered data IO finishes, this gets called so we can finish |
| 1528 | * an ordered extent if the range of bytes in the file it covers are |
| 1529 | * fully written. |
| 1530 | */ |
Chris Mason | 211f90e | 2008-07-18 11:56:15 -0400 | [diff] [blame] | 1531 | 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] | 1532 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1533 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1534 | struct btrfs_trans_handle *trans; |
Chris Mason | 5d13a98 | 2009-03-13 11:41:46 -0400 | [diff] [blame] | 1535 | struct btrfs_ordered_extent *ordered_extent = NULL; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1536 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1537 | struct btrfs_path *path; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1538 | int compressed = 0; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1539 | int ret; |
| 1540 | |
| 1541 | ret = btrfs_dec_test_ordered_pending(inode, start, end - start + 1); |
Chris Mason | ba1da2f | 2008-07-17 12:54:15 -0400 | [diff] [blame] | 1542 | if (!ret) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1543 | return 0; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1544 | |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1545 | /* |
| 1546 | * before we join the transaction, try to do some of our IO. |
| 1547 | * This will limit the amount of IO that we have to do with |
| 1548 | * the transaction running. We're unlikely to need to do any |
| 1549 | * IO if the file extents are new, the disk_i_size checks |
| 1550 | * covers the most common case. |
| 1551 | */ |
| 1552 | if (start < BTRFS_I(inode)->disk_i_size) { |
| 1553 | path = btrfs_alloc_path(); |
| 1554 | if (path) { |
| 1555 | ret = btrfs_lookup_file_extent(NULL, root, path, |
| 1556 | inode->i_ino, |
| 1557 | start, 0); |
Chris Mason | 5d13a98 | 2009-03-13 11:41:46 -0400 | [diff] [blame] | 1558 | ordered_extent = btrfs_lookup_ordered_extent(inode, |
| 1559 | start); |
| 1560 | if (!list_empty(&ordered_extent->list)) { |
| 1561 | btrfs_release_path(root, path); |
| 1562 | reada_csum(root, path, ordered_extent); |
| 1563 | } |
Chris Mason | b7ec40d | 2009-03-12 20:12:45 -0400 | [diff] [blame] | 1564 | btrfs_free_path(path); |
| 1565 | } |
| 1566 | } |
| 1567 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 1568 | trans = btrfs_join_transaction(root, 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1569 | |
Chris Mason | 5d13a98 | 2009-03-13 11:41:46 -0400 | [diff] [blame] | 1570 | if (!ordered_extent) |
| 1571 | ordered_extent = btrfs_lookup_ordered_extent(inode, start); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1572 | BUG_ON(!ordered_extent); |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1573 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) |
| 1574 | goto nocow; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1575 | |
| 1576 | lock_extent(io_tree, ordered_extent->file_offset, |
| 1577 | ordered_extent->file_offset + ordered_extent->len - 1, |
| 1578 | GFP_NOFS); |
| 1579 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1580 | if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags)) |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1581 | compressed = 1; |
| 1582 | if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
| 1583 | BUG_ON(compressed); |
| 1584 | ret = btrfs_mark_extent_written(trans, root, inode, |
| 1585 | ordered_extent->file_offset, |
| 1586 | ordered_extent->file_offset + |
| 1587 | ordered_extent->len); |
| 1588 | BUG_ON(ret); |
| 1589 | } else { |
| 1590 | ret = insert_reserved_file_extent(trans, inode, |
| 1591 | ordered_extent->file_offset, |
| 1592 | ordered_extent->start, |
| 1593 | ordered_extent->disk_len, |
| 1594 | ordered_extent->len, |
| 1595 | ordered_extent->len, |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 1596 | ordered_extent->file_offset + |
| 1597 | ordered_extent->len, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 1598 | compressed, 0, 0, |
| 1599 | BTRFS_FILE_EXTENT_REG); |
| 1600 | BUG_ON(ret); |
| 1601 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1602 | unlock_extent(io_tree, ordered_extent->file_offset, |
| 1603 | ordered_extent->file_offset + ordered_extent->len - 1, |
| 1604 | GFP_NOFS); |
Yan Zheng | 7ea394f | 2008-08-05 13:05:02 -0400 | [diff] [blame] | 1605 | nocow: |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1606 | add_pending_csums(trans, inode, ordered_extent->file_offset, |
| 1607 | &ordered_extent->list); |
| 1608 | |
Chris Mason | 3435302 | 2008-09-23 20:19:49 -0400 | [diff] [blame] | 1609 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 1610 | btrfs_ordered_update_i_size(inode, ordered_extent); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 1611 | btrfs_update_inode(trans, root, inode); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1612 | btrfs_remove_ordered_extent(inode, ordered_extent); |
Chris Mason | 3435302 | 2008-09-23 20:19:49 -0400 | [diff] [blame] | 1613 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
Chris Mason | 7f3c74f | 2008-07-18 12:01:11 -0400 | [diff] [blame] | 1614 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1615 | /* once for us */ |
| 1616 | btrfs_put_ordered_extent(ordered_extent); |
| 1617 | /* once for the tree */ |
| 1618 | btrfs_put_ordered_extent(ordered_extent); |
| 1619 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 1620 | btrfs_end_transaction(trans, root); |
| 1621 | return 0; |
| 1622 | } |
| 1623 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1624 | 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] | 1625 | struct extent_state *state, int uptodate) |
| 1626 | { |
| 1627 | return btrfs_finish_ordered_io(page->mapping->host, start, end); |
| 1628 | } |
| 1629 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1630 | /* |
| 1631 | * When IO fails, either with EIO or csum verification fails, we |
| 1632 | * try other mirrors that might have a good copy of the data. This |
| 1633 | * io_failure_record is used to record state as we go through all the |
| 1634 | * mirrors. If another mirror has good data, the page is set up to date |
| 1635 | * and things continue. If a good mirror can't be found, the original |
| 1636 | * bio end_io callback is called to indicate things have failed. |
| 1637 | */ |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1638 | struct io_failure_record { |
| 1639 | struct page *page; |
| 1640 | u64 start; |
| 1641 | u64 len; |
| 1642 | u64 logical; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1643 | unsigned long bio_flags; |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1644 | int last_mirror; |
| 1645 | }; |
| 1646 | |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1647 | static int btrfs_io_failed_hook(struct bio *failed_bio, |
Chris Mason | 1259ab7 | 2008-05-12 13:39:03 -0400 | [diff] [blame] | 1648 | struct page *page, u64 start, u64 end, |
| 1649 | struct extent_state *state) |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1650 | { |
| 1651 | struct io_failure_record *failrec = NULL; |
| 1652 | u64 private; |
| 1653 | struct extent_map *em; |
| 1654 | struct inode *inode = page->mapping->host; |
| 1655 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 1656 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1657 | struct bio *bio; |
| 1658 | int num_copies; |
| 1659 | int ret; |
Chris Mason | 1259ab7 | 2008-05-12 13:39:03 -0400 | [diff] [blame] | 1660 | int rw; |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1661 | u64 logical; |
| 1662 | |
| 1663 | ret = get_state_private(failure_tree, start, &private); |
| 1664 | if (ret) { |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1665 | failrec = kmalloc(sizeof(*failrec), GFP_NOFS); |
| 1666 | if (!failrec) |
| 1667 | return -ENOMEM; |
| 1668 | failrec->start = start; |
| 1669 | failrec->len = end - start + 1; |
| 1670 | failrec->last_mirror = 0; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1671 | failrec->bio_flags = 0; |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1672 | |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 1673 | spin_lock(&em_tree->lock); |
| 1674 | em = lookup_extent_mapping(em_tree, start, failrec->len); |
| 1675 | if (em->start > start || em->start + em->len < start) { |
| 1676 | free_extent_map(em); |
| 1677 | em = NULL; |
| 1678 | } |
| 1679 | spin_unlock(&em_tree->lock); |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1680 | |
| 1681 | if (!em || IS_ERR(em)) { |
| 1682 | kfree(failrec); |
| 1683 | return -EIO; |
| 1684 | } |
| 1685 | logical = start - em->start; |
| 1686 | logical = em->block_start + logical; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1687 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
| 1688 | logical = em->block_start; |
| 1689 | failrec->bio_flags = EXTENT_BIO_COMPRESSED; |
| 1690 | } |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1691 | failrec->logical = logical; |
| 1692 | free_extent_map(em); |
| 1693 | set_extent_bits(failure_tree, start, end, EXTENT_LOCKED | |
| 1694 | EXTENT_DIRTY, GFP_NOFS); |
Chris Mason | 587f770 | 2008-04-11 12:16:46 -0400 | [diff] [blame] | 1695 | set_state_private(failure_tree, start, |
| 1696 | (u64)(unsigned long)failrec); |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1697 | } else { |
Chris Mason | 587f770 | 2008-04-11 12:16:46 -0400 | [diff] [blame] | 1698 | failrec = (struct io_failure_record *)(unsigned long)private; |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1699 | } |
| 1700 | num_copies = btrfs_num_copies( |
| 1701 | &BTRFS_I(inode)->root->fs_info->mapping_tree, |
| 1702 | failrec->logical, failrec->len); |
| 1703 | failrec->last_mirror++; |
| 1704 | if (!state) { |
Chris Mason | cad321a | 2008-12-17 14:51:42 -0500 | [diff] [blame] | 1705 | spin_lock(&BTRFS_I(inode)->io_tree.lock); |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1706 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, |
| 1707 | failrec->start, |
| 1708 | EXTENT_LOCKED); |
| 1709 | if (state && state->start != failrec->start) |
| 1710 | state = NULL; |
Chris Mason | cad321a | 2008-12-17 14:51:42 -0500 | [diff] [blame] | 1711 | spin_unlock(&BTRFS_I(inode)->io_tree.lock); |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1712 | } |
| 1713 | if (!state || failrec->last_mirror > num_copies) { |
| 1714 | set_state_private(failure_tree, failrec->start, 0); |
| 1715 | clear_extent_bits(failure_tree, failrec->start, |
| 1716 | failrec->start + failrec->len - 1, |
| 1717 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); |
| 1718 | kfree(failrec); |
| 1719 | return -EIO; |
| 1720 | } |
| 1721 | bio = bio_alloc(GFP_NOFS, 1); |
| 1722 | bio->bi_private = state; |
| 1723 | bio->bi_end_io = failed_bio->bi_end_io; |
| 1724 | bio->bi_sector = failrec->logical >> 9; |
| 1725 | bio->bi_bdev = failed_bio->bi_bdev; |
Chris Mason | e1c4b74 | 2008-04-22 13:26:46 -0400 | [diff] [blame] | 1726 | bio->bi_size = 0; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1727 | |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1728 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); |
Chris Mason | 1259ab7 | 2008-05-12 13:39:03 -0400 | [diff] [blame] | 1729 | if (failed_bio->bi_rw & (1 << BIO_RW)) |
| 1730 | rw = WRITE; |
| 1731 | else |
| 1732 | rw = READ; |
| 1733 | |
| 1734 | BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 1735 | failrec->last_mirror, |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1736 | failrec->bio_flags); |
Chris Mason | 1259ab7 | 2008-05-12 13:39:03 -0400 | [diff] [blame] | 1737 | return 0; |
| 1738 | } |
| 1739 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1740 | /* |
| 1741 | * each time an IO finishes, we do a fast check in the IO failure tree |
| 1742 | * to see if we need to process or clean up an io_failure_record |
| 1743 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1744 | static int btrfs_clean_io_failures(struct inode *inode, u64 start) |
Chris Mason | 1259ab7 | 2008-05-12 13:39:03 -0400 | [diff] [blame] | 1745 | { |
| 1746 | u64 private; |
| 1747 | u64 private_failure; |
| 1748 | struct io_failure_record *failure; |
| 1749 | int ret; |
| 1750 | |
| 1751 | private = 0; |
| 1752 | if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, |
| 1753 | (u64)-1, 1, EXTENT_DIRTY)) { |
| 1754 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, |
| 1755 | start, &private_failure); |
| 1756 | if (ret == 0) { |
| 1757 | failure = (struct io_failure_record *)(unsigned long) |
| 1758 | private_failure; |
| 1759 | set_state_private(&BTRFS_I(inode)->io_failure_tree, |
| 1760 | failure->start, 0); |
| 1761 | clear_extent_bits(&BTRFS_I(inode)->io_failure_tree, |
| 1762 | failure->start, |
| 1763 | failure->start + failure->len - 1, |
| 1764 | EXTENT_DIRTY | EXTENT_LOCKED, |
| 1765 | GFP_NOFS); |
| 1766 | kfree(failure); |
| 1767 | } |
| 1768 | } |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1769 | return 0; |
| 1770 | } |
| 1771 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 1772 | /* |
| 1773 | * when reads are done, we need to check csums to verify the data is correct |
| 1774 | * if there's a match, we allow the bio to finish. If not, we go through |
| 1775 | * the io_failure_record routines to find good copies |
| 1776 | */ |
Christoph Hellwig | b295086 | 2008-12-02 09:54:17 -0500 | [diff] [blame] | 1777 | 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] | 1778 | struct extent_state *state) |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1779 | { |
Chris Mason | 35ebb93 | 2007-10-30 16:56:53 -0400 | [diff] [blame] | 1780 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1781 | struct inode *inode = page->mapping->host; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1782 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1783 | char *kaddr; |
Chris Mason | aadfeb6 | 2008-01-29 09:10:27 -0500 | [diff] [blame] | 1784 | u64 private = ~(u32)0; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1785 | int ret; |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 1786 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1787 | u32 csum = ~(u32)0; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 1788 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1789 | if (PageChecked(page)) { |
| 1790 | ClearPageChecked(page); |
| 1791 | goto good; |
| 1792 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 1793 | |
| 1794 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) |
Chris Mason | b6cda9b | 2007-12-14 15:30:32 -0500 | [diff] [blame] | 1795 | return 0; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1796 | |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 1797 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID && |
| 1798 | test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1)) { |
| 1799 | clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM, |
| 1800 | GFP_NOFS); |
| 1801 | return 0; |
| 1802 | } |
| 1803 | |
Yan | c2e639f | 2008-02-04 08:57:25 -0500 | [diff] [blame] | 1804 | if (state && state->start == start) { |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 1805 | private = state->private; |
| 1806 | ret = 0; |
| 1807 | } else { |
| 1808 | ret = get_state_private(io_tree, start, &private); |
| 1809 | } |
Chris Mason | 9ab86c8 | 2009-01-07 09:48:51 -0500 | [diff] [blame] | 1810 | kaddr = kmap_atomic(page, KM_USER0); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1811 | if (ret) |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1812 | goto zeroit; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1813 | |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 1814 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
| 1815 | btrfs_csum_final(csum, (char *)&csum); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1816 | if (csum != private) |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1817 | goto zeroit; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 1818 | |
Chris Mason | 9ab86c8 | 2009-01-07 09:48:51 -0500 | [diff] [blame] | 1819 | kunmap_atomic(kaddr, KM_USER0); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 1820 | good: |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1821 | /* if the io failure tree for this inode is non-empty, |
| 1822 | * check to see if we've recovered from a failed IO |
| 1823 | */ |
Chris Mason | 1259ab7 | 2008-05-12 13:39:03 -0400 | [diff] [blame] | 1824 | btrfs_clean_io_failures(inode, start); |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1825 | return 0; |
| 1826 | |
| 1827 | zeroit: |
Chris Mason | 193f284 | 2009-04-27 07:29:05 -0400 | [diff] [blame] | 1828 | if (printk_ratelimit()) { |
| 1829 | printk(KERN_INFO "btrfs csum failed ino %lu off %llu csum %u " |
| 1830 | "private %llu\n", page->mapping->host->i_ino, |
| 1831 | (unsigned long long)start, csum, |
| 1832 | (unsigned long long)private); |
| 1833 | } |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 1834 | memset(kaddr + offset, 1, end - start + 1); |
| 1835 | flush_dcache_page(page); |
Chris Mason | 9ab86c8 | 2009-01-07 09:48:51 -0500 | [diff] [blame] | 1836 | kunmap_atomic(kaddr, KM_USER0); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 1837 | if (private == 0) |
| 1838 | return 0; |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 1839 | return -EIO; |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 1840 | } |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 1841 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1842 | /* |
| 1843 | * This creates an orphan entry for the given inode in case something goes |
| 1844 | * wrong in the middle of an unlink/truncate. |
| 1845 | */ |
| 1846 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) |
| 1847 | { |
| 1848 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1849 | int ret = 0; |
| 1850 | |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1851 | spin_lock(&root->list_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1852 | |
| 1853 | /* already on the orphan list, we're good */ |
| 1854 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1855 | spin_unlock(&root->list_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1856 | return 0; |
| 1857 | } |
| 1858 | |
| 1859 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); |
| 1860 | |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1861 | spin_unlock(&root->list_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1862 | |
| 1863 | /* |
| 1864 | * insert an orphan item to track this unlinked/truncated file |
| 1865 | */ |
| 1866 | ret = btrfs_insert_orphan_item(trans, root, inode->i_ino); |
| 1867 | |
| 1868 | return ret; |
| 1869 | } |
| 1870 | |
| 1871 | /* |
| 1872 | * We have done the truncate/delete so we can go ahead and remove the orphan |
| 1873 | * item for this particular inode. |
| 1874 | */ |
| 1875 | int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) |
| 1876 | { |
| 1877 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 1878 | int ret = 0; |
| 1879 | |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1880 | spin_lock(&root->list_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1881 | |
| 1882 | if (list_empty(&BTRFS_I(inode)->i_orphan)) { |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1883 | spin_unlock(&root->list_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1884 | return 0; |
| 1885 | } |
| 1886 | |
| 1887 | list_del_init(&BTRFS_I(inode)->i_orphan); |
| 1888 | if (!trans) { |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1889 | spin_unlock(&root->list_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1890 | return 0; |
| 1891 | } |
| 1892 | |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1893 | spin_unlock(&root->list_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1894 | |
| 1895 | ret = btrfs_del_orphan_item(trans, root, inode->i_ino); |
| 1896 | |
| 1897 | return ret; |
| 1898 | } |
| 1899 | |
| 1900 | /* |
| 1901 | * this cleans up any orphans that may be left on the list from the last use |
| 1902 | * of this root. |
| 1903 | */ |
| 1904 | void btrfs_orphan_cleanup(struct btrfs_root *root) |
| 1905 | { |
| 1906 | struct btrfs_path *path; |
| 1907 | struct extent_buffer *leaf; |
| 1908 | struct btrfs_item *item; |
| 1909 | struct btrfs_key key, found_key; |
| 1910 | struct btrfs_trans_handle *trans; |
| 1911 | struct inode *inode; |
| 1912 | int ret = 0, nr_unlink = 0, nr_truncate = 0; |
| 1913 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1914 | path = btrfs_alloc_path(); |
| 1915 | if (!path) |
| 1916 | return; |
| 1917 | path->reada = -1; |
| 1918 | |
| 1919 | key.objectid = BTRFS_ORPHAN_OBJECTID; |
| 1920 | btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); |
| 1921 | key.offset = (u64)-1; |
| 1922 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1923 | |
| 1924 | while (1) { |
| 1925 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 1926 | if (ret < 0) { |
| 1927 | printk(KERN_ERR "Error searching slot for orphan: %d" |
| 1928 | "\n", ret); |
| 1929 | break; |
| 1930 | } |
| 1931 | |
| 1932 | /* |
| 1933 | * if ret == 0 means we found what we were searching for, which |
| 1934 | * is weird, but possible, so only screw with path if we didnt |
| 1935 | * find the key and see if we have stuff that matches |
| 1936 | */ |
| 1937 | if (ret > 0) { |
| 1938 | if (path->slots[0] == 0) |
| 1939 | break; |
| 1940 | path->slots[0]--; |
| 1941 | } |
| 1942 | |
| 1943 | /* pull out the item */ |
| 1944 | leaf = path->nodes[0]; |
| 1945 | item = btrfs_item_nr(leaf, path->slots[0]); |
| 1946 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 1947 | |
| 1948 | /* make sure the item matches what we want */ |
| 1949 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) |
| 1950 | break; |
| 1951 | if (btrfs_key_type(&found_key) != BTRFS_ORPHAN_ITEM_KEY) |
| 1952 | break; |
| 1953 | |
| 1954 | /* release the path since we're done with it */ |
| 1955 | btrfs_release_path(root, path); |
| 1956 | |
| 1957 | /* |
| 1958 | * this is where we are basically btrfs_lookup, without the |
| 1959 | * crossing root thing. we store the inode number in the |
| 1960 | * offset of the orphan item. |
| 1961 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 1962 | found_key.objectid = found_key.offset; |
| 1963 | found_key.type = BTRFS_INODE_ITEM_KEY; |
| 1964 | found_key.offset = 0; |
| 1965 | inode = btrfs_iget(root->fs_info->sb, &found_key, root); |
| 1966 | if (IS_ERR(inode)) |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1967 | break; |
| 1968 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1969 | /* |
| 1970 | * add this inode to the orphan list so btrfs_orphan_del does |
| 1971 | * the proper thing when we hit it |
| 1972 | */ |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1973 | spin_lock(&root->list_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1974 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); |
Yan | bcc63ab | 2008-07-30 16:29:20 -0400 | [diff] [blame] | 1975 | spin_unlock(&root->list_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1976 | |
| 1977 | /* |
| 1978 | * if this is a bad inode, means we actually succeeded in |
| 1979 | * removing the inode, but not the orphan record, which means |
| 1980 | * we need to manually delete the orphan since iput will just |
| 1981 | * do a destroy_inode |
| 1982 | */ |
| 1983 | if (is_bad_inode(inode)) { |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 1984 | trans = btrfs_start_transaction(root, 1); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1985 | btrfs_orphan_del(trans, inode); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 1986 | btrfs_end_transaction(trans, root); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 1987 | iput(inode); |
| 1988 | continue; |
| 1989 | } |
| 1990 | |
| 1991 | /* if we have links, this was a truncate, lets do that */ |
| 1992 | if (inode->i_nlink) { |
| 1993 | nr_truncate++; |
| 1994 | btrfs_truncate(inode); |
| 1995 | } else { |
| 1996 | nr_unlink++; |
| 1997 | } |
| 1998 | |
| 1999 | /* this will do delete_inode and everything for us */ |
| 2000 | iput(inode); |
| 2001 | } |
| 2002 | |
| 2003 | if (nr_unlink) |
| 2004 | printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink); |
| 2005 | if (nr_truncate) |
| 2006 | printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate); |
| 2007 | |
| 2008 | btrfs_free_path(path); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2009 | } |
| 2010 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2011 | /* |
Chris Mason | 46a53cc | 2009-04-27 11:47:50 -0400 | [diff] [blame] | 2012 | * very simple check to peek ahead in the leaf looking for xattrs. If we |
| 2013 | * don't find any xattrs, we know there can't be any acls. |
| 2014 | * |
| 2015 | * slot is the slot the inode is in, objectid is the objectid of the inode |
| 2016 | */ |
| 2017 | static noinline int acls_after_inode_item(struct extent_buffer *leaf, |
| 2018 | int slot, u64 objectid) |
| 2019 | { |
| 2020 | u32 nritems = btrfs_header_nritems(leaf); |
| 2021 | struct btrfs_key found_key; |
| 2022 | int scanned = 0; |
| 2023 | |
| 2024 | slot++; |
| 2025 | while (slot < nritems) { |
| 2026 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 2027 | |
| 2028 | /* we found a different objectid, there must not be acls */ |
| 2029 | if (found_key.objectid != objectid) |
| 2030 | return 0; |
| 2031 | |
| 2032 | /* we found an xattr, assume we've got an acl */ |
| 2033 | if (found_key.type == BTRFS_XATTR_ITEM_KEY) |
| 2034 | return 1; |
| 2035 | |
| 2036 | /* |
| 2037 | * we found a key greater than an xattr key, there can't |
| 2038 | * be any acls later on |
| 2039 | */ |
| 2040 | if (found_key.type > BTRFS_XATTR_ITEM_KEY) |
| 2041 | return 0; |
| 2042 | |
| 2043 | slot++; |
| 2044 | scanned++; |
| 2045 | |
| 2046 | /* |
| 2047 | * it goes inode, inode backrefs, xattrs, extents, |
| 2048 | * so if there are a ton of hard links to an inode there can |
| 2049 | * be a lot of backrefs. Don't waste time searching too hard, |
| 2050 | * this is just an optimization |
| 2051 | */ |
| 2052 | if (scanned >= 8) |
| 2053 | break; |
| 2054 | } |
| 2055 | /* we hit the end of the leaf before we found an xattr or |
| 2056 | * something larger than an xattr. We have to assume the inode |
| 2057 | * has acls |
| 2058 | */ |
| 2059 | return 1; |
| 2060 | } |
| 2061 | |
| 2062 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2063 | * read an inode from the btree into the in-memory inode |
| 2064 | */ |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2065 | static void btrfs_read_locked_inode(struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2066 | { |
| 2067 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2068 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2069 | struct btrfs_inode_item *inode_item; |
Chris Mason | 0b86a83 | 2008-03-24 15:01:56 -0400 | [diff] [blame] | 2070 | struct btrfs_timespec *tspec; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2071 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2072 | struct btrfs_key location; |
Chris Mason | 46a53cc | 2009-04-27 11:47:50 -0400 | [diff] [blame] | 2073 | int maybe_acls; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2074 | u64 alloc_group_block; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 2075 | u32 rdev; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2076 | int ret; |
| 2077 | |
| 2078 | path = btrfs_alloc_path(); |
| 2079 | BUG_ON(!path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2080 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
Chris Mason | dc17ff8 | 2008-01-08 15:46:30 -0500 | [diff] [blame] | 2081 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2082 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2083 | if (ret) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2084 | goto make_bad; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2085 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2086 | leaf = path->nodes[0]; |
| 2087 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
| 2088 | struct btrfs_inode_item); |
| 2089 | |
| 2090 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); |
| 2091 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); |
| 2092 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); |
| 2093 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 2094 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2095 | |
| 2096 | tspec = btrfs_inode_atime(inode_item); |
| 2097 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); |
| 2098 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); |
| 2099 | |
| 2100 | tspec = btrfs_inode_mtime(inode_item); |
| 2101 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); |
| 2102 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); |
| 2103 | |
| 2104 | tspec = btrfs_inode_ctime(inode_item); |
| 2105 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); |
| 2106 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); |
| 2107 | |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 2108 | inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item)); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2109 | BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item); |
Chris Mason | c3027eb | 2008-12-08 16:40:21 -0500 | [diff] [blame] | 2110 | BTRFS_I(inode)->sequence = btrfs_inode_sequence(leaf, inode_item); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2111 | inode->i_generation = BTRFS_I(inode)->generation; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 2112 | inode->i_rdev = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2113 | rdev = btrfs_inode_rdev(leaf, inode_item); |
| 2114 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2115 | BTRFS_I(inode)->index_cnt = (u64)-1; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2116 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2117 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2118 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 2119 | |
Chris Mason | 46a53cc | 2009-04-27 11:47:50 -0400 | [diff] [blame] | 2120 | /* |
| 2121 | * try to precache a NULL acl entry for files that don't have |
| 2122 | * any xattrs or acls |
| 2123 | */ |
| 2124 | maybe_acls = acls_after_inode_item(leaf, path->slots[0], inode->i_ino); |
Al Viro | 72c0490 | 2009-06-24 16:58:48 -0400 | [diff] [blame] | 2125 | if (!maybe_acls) |
| 2126 | cache_no_acl(inode); |
Chris Mason | 46a53cc | 2009-04-27 11:47:50 -0400 | [diff] [blame] | 2127 | |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2128 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, 0, |
| 2129 | alloc_group_block, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2130 | btrfs_free_path(path); |
| 2131 | inode_item = NULL; |
| 2132 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2133 | switch (inode->i_mode & S_IFMT) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2134 | case S_IFREG: |
| 2135 | inode->i_mapping->a_ops = &btrfs_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 2136 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 2137 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2138 | inode->i_fop = &btrfs_file_operations; |
| 2139 | inode->i_op = &btrfs_file_inode_operations; |
| 2140 | break; |
| 2141 | case S_IFDIR: |
| 2142 | inode->i_fop = &btrfs_dir_file_operations; |
| 2143 | if (root == root->fs_info->tree_root) |
| 2144 | inode->i_op = &btrfs_dir_ro_inode_operations; |
| 2145 | else |
| 2146 | inode->i_op = &btrfs_dir_inode_operations; |
| 2147 | break; |
| 2148 | case S_IFLNK: |
| 2149 | inode->i_op = &btrfs_symlink_inode_operations; |
| 2150 | inode->i_mapping->a_ops = &btrfs_symlink_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 2151 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2152 | break; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 2153 | default: |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 2154 | inode->i_op = &btrfs_special_inode_operations; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 2155 | init_special_inode(inode, inode->i_mode, rdev); |
| 2156 | break; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2157 | } |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 2158 | |
| 2159 | btrfs_update_iflags(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2160 | return; |
| 2161 | |
| 2162 | make_bad: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2163 | btrfs_free_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2164 | make_bad_inode(inode); |
| 2165 | } |
| 2166 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2167 | /* |
| 2168 | * given a leaf and an inode, copy the inode fields into the leaf |
| 2169 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2170 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
| 2171 | struct extent_buffer *leaf, |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2172 | struct btrfs_inode_item *item, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2173 | struct inode *inode) |
| 2174 | { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2175 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
| 2176 | btrfs_set_inode_gid(leaf, item, inode->i_gid); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 2177 | btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2178 | btrfs_set_inode_mode(leaf, item, inode->i_mode); |
| 2179 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); |
| 2180 | |
| 2181 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), |
| 2182 | inode->i_atime.tv_sec); |
| 2183 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), |
| 2184 | inode->i_atime.tv_nsec); |
| 2185 | |
| 2186 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), |
| 2187 | inode->i_mtime.tv_sec); |
| 2188 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), |
| 2189 | inode->i_mtime.tv_nsec); |
| 2190 | |
| 2191 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), |
| 2192 | inode->i_ctime.tv_sec); |
| 2193 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), |
| 2194 | inode->i_ctime.tv_nsec); |
| 2195 | |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 2196 | btrfs_set_inode_nbytes(leaf, item, inode_get_bytes(inode)); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2197 | btrfs_set_inode_generation(leaf, item, BTRFS_I(inode)->generation); |
Chris Mason | c3027eb | 2008-12-08 16:40:21 -0500 | [diff] [blame] | 2198 | btrfs_set_inode_sequence(leaf, item, BTRFS_I(inode)->sequence); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2199 | btrfs_set_inode_transid(leaf, item, trans->transid); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2200 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); |
Yan | b98b676 | 2008-01-08 15:54:37 -0500 | [diff] [blame] | 2201 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 2202 | btrfs_set_inode_block_group(leaf, item, BTRFS_I(inode)->block_group); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2203 | } |
| 2204 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2205 | /* |
| 2206 | * copy everything in the in-memory inode into the btree. |
| 2207 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2208 | noinline int btrfs_update_inode(struct btrfs_trans_handle *trans, |
| 2209 | struct btrfs_root *root, struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2210 | { |
| 2211 | struct btrfs_inode_item *inode_item; |
| 2212 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2213 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2214 | int ret; |
| 2215 | |
| 2216 | path = btrfs_alloc_path(); |
| 2217 | BUG_ON(!path); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2218 | path->leave_spinning = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2219 | ret = btrfs_lookup_inode(trans, root, path, |
| 2220 | &BTRFS_I(inode)->location, 1); |
| 2221 | if (ret) { |
| 2222 | if (ret > 0) |
| 2223 | ret = -ENOENT; |
| 2224 | goto failed; |
| 2225 | } |
| 2226 | |
Chris Mason | b4ce94d | 2009-02-04 09:25:08 -0500 | [diff] [blame] | 2227 | btrfs_unlock_up_safe(path, 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2228 | leaf = path->nodes[0]; |
| 2229 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2230 | struct btrfs_inode_item); |
| 2231 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2232 | fill_inode_item(trans, leaf, inode_item, inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2233 | btrfs_mark_buffer_dirty(leaf); |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 2234 | btrfs_set_inode_last_trans(trans, inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2235 | ret = 0; |
| 2236 | failed: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2237 | btrfs_free_path(path); |
| 2238 | return ret; |
| 2239 | } |
| 2240 | |
| 2241 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 2242 | /* |
| 2243 | * unlink helper that gets used here in inode.c and in the tree logging |
| 2244 | * recovery code. It remove a link in a directory with a given name, and |
| 2245 | * also drops the back refs in the inode to the directory |
| 2246 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2247 | int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
| 2248 | struct btrfs_root *root, |
| 2249 | struct inode *dir, struct inode *inode, |
| 2250 | const char *name, int name_len) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2251 | { |
| 2252 | struct btrfs_path *path; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2253 | int ret = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2254 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2255 | struct btrfs_dir_item *di; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2256 | struct btrfs_key key; |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2257 | u64 index; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2258 | |
| 2259 | path = btrfs_alloc_path(); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2260 | if (!path) { |
| 2261 | ret = -ENOMEM; |
| 2262 | goto err; |
| 2263 | } |
| 2264 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2265 | path->leave_spinning = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2266 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
| 2267 | name, name_len, -1); |
| 2268 | if (IS_ERR(di)) { |
| 2269 | ret = PTR_ERR(di); |
| 2270 | goto err; |
| 2271 | } |
| 2272 | if (!di) { |
| 2273 | ret = -ENOENT; |
| 2274 | goto err; |
| 2275 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2276 | leaf = path->nodes[0]; |
| 2277 | btrfs_dir_item_key_to_cpu(leaf, di, &key); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2278 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 2279 | if (ret) |
| 2280 | goto err; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2281 | btrfs_release_path(root, path); |
| 2282 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2283 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2284 | inode->i_ino, |
| 2285 | dir->i_ino, &index); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2286 | if (ret) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2287 | printk(KERN_INFO "btrfs failed to delete reference to %.*s, " |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2288 | "inode %lu parent %lu\n", name_len, name, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2289 | inode->i_ino, dir->i_ino); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2290 | goto err; |
| 2291 | } |
| 2292 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2293 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 2294 | index, name, name_len, -1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2295 | if (IS_ERR(di)) { |
| 2296 | ret = PTR_ERR(di); |
| 2297 | goto err; |
| 2298 | } |
| 2299 | if (!di) { |
| 2300 | ret = -ENOENT; |
| 2301 | goto err; |
| 2302 | } |
| 2303 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2304 | btrfs_release_path(root, path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2305 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2306 | ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, |
| 2307 | inode, dir->i_ino); |
Chris Mason | 49eb7e4 | 2008-09-11 15:53:12 -0400 | [diff] [blame] | 2308 | BUG_ON(ret != 0 && ret != -ENOENT); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2309 | |
| 2310 | ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, |
| 2311 | dir, index); |
| 2312 | BUG_ON(ret); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2313 | err: |
| 2314 | btrfs_free_path(path); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2315 | if (ret) |
| 2316 | goto out; |
| 2317 | |
| 2318 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); |
| 2319 | inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
| 2320 | btrfs_update_inode(trans, root, dir); |
| 2321 | btrfs_drop_nlink(inode); |
| 2322 | ret = btrfs_update_inode(trans, root, inode); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2323 | out: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2324 | return ret; |
| 2325 | } |
| 2326 | |
| 2327 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) |
| 2328 | { |
| 2329 | struct btrfs_root *root; |
| 2330 | struct btrfs_trans_handle *trans; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2331 | struct inode *inode = dentry->d_inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2332 | int ret; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 2333 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2334 | |
| 2335 | root = BTRFS_I(dir)->root; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 2336 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2337 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2338 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2339 | btrfs_set_trans_block_group(trans, dir); |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 2340 | |
| 2341 | btrfs_record_unlink_dir(trans, dir, dentry->d_inode, 0); |
| 2342 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2343 | ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
| 2344 | dentry->d_name.name, dentry->d_name.len); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2345 | |
| 2346 | if (inode->i_nlink == 0) |
| 2347 | ret = btrfs_orphan_add(trans, inode); |
| 2348 | |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 2349 | nr = trans->blocks_used; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2350 | |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 2351 | btrfs_end_transaction_throttle(trans, root); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 2352 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2353 | return ret; |
| 2354 | } |
| 2355 | |
| 2356 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 2357 | { |
| 2358 | struct inode *inode = dentry->d_inode; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 2359 | int err = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2360 | int ret; |
| 2361 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2362 | struct btrfs_trans_handle *trans; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 2363 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2364 | |
Chris Mason | 3394e16 | 2008-11-17 20:42:26 -0500 | [diff] [blame] | 2365 | /* |
| 2366 | * the FIRST_FREE_OBJECTID check makes sure we don't try to rmdir |
| 2367 | * the root of a subvolume or snapshot |
| 2368 | */ |
| 2369 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE || |
| 2370 | inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) { |
Yan | 134d451 | 2007-10-25 15:49:25 -0400 | [diff] [blame] | 2371 | return -ENOTEMPTY; |
Chris Mason | 925baed | 2008-06-25 16:01:30 -0400 | [diff] [blame] | 2372 | } |
Yan | 134d451 | 2007-10-25 15:49:25 -0400 | [diff] [blame] | 2373 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2374 | trans = btrfs_start_transaction(root, 1); |
| 2375 | btrfs_set_trans_block_group(trans, dir); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2376 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2377 | err = btrfs_orphan_add(trans, inode); |
| 2378 | if (err) |
| 2379 | goto fail_trans; |
| 2380 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2381 | /* now the directory is empty */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2382 | err = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
| 2383 | dentry->d_name.name, dentry->d_name.len); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2384 | if (!err) |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 2385 | btrfs_i_size_write(inode, 0); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 2386 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2387 | fail_trans: |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 2388 | nr = trans->blocks_used; |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 2389 | ret = btrfs_end_transaction_throttle(trans, root); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 2390 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 2391 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2392 | if (ret && !err) |
| 2393 | err = ret; |
| 2394 | return err; |
| 2395 | } |
| 2396 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 2397 | #if 0 |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2398 | /* |
Chris Mason | 323ac95 | 2008-10-01 19:05:46 -0400 | [diff] [blame] | 2399 | * when truncating bytes in a file, it is possible to avoid reading |
| 2400 | * the leaves that contain only checksum items. This can be the |
| 2401 | * majority of the IO required to delete a large file, but it must |
| 2402 | * be done carefully. |
| 2403 | * |
| 2404 | * The keys in the level just above the leaves are checked to make sure |
| 2405 | * the lowest key in a given leaf is a csum key, and starts at an offset |
| 2406 | * after the new size. |
| 2407 | * |
| 2408 | * Then the key for the next leaf is checked to make sure it also has |
| 2409 | * a checksum item for the same file. If it does, we know our target leaf |
| 2410 | * contains only checksum items, and it can be safely freed without reading |
| 2411 | * it. |
| 2412 | * |
| 2413 | * This is just an optimization targeted at large files. It may do |
| 2414 | * nothing. It will return 0 unless things went badly. |
| 2415 | */ |
| 2416 | static noinline int drop_csum_leaves(struct btrfs_trans_handle *trans, |
| 2417 | struct btrfs_root *root, |
| 2418 | struct btrfs_path *path, |
| 2419 | struct inode *inode, u64 new_size) |
| 2420 | { |
| 2421 | struct btrfs_key key; |
| 2422 | int ret; |
| 2423 | int nritems; |
| 2424 | struct btrfs_key found_key; |
| 2425 | struct btrfs_key other_key; |
Yan Zheng | 5b84e8d | 2008-10-09 11:46:19 -0400 | [diff] [blame] | 2426 | struct btrfs_leaf_ref *ref; |
| 2427 | u64 leaf_gen; |
| 2428 | u64 leaf_start; |
Chris Mason | 323ac95 | 2008-10-01 19:05:46 -0400 | [diff] [blame] | 2429 | |
| 2430 | path->lowest_level = 1; |
| 2431 | key.objectid = inode->i_ino; |
| 2432 | key.type = BTRFS_CSUM_ITEM_KEY; |
| 2433 | key.offset = new_size; |
| 2434 | again: |
| 2435 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 2436 | if (ret < 0) |
| 2437 | goto out; |
| 2438 | |
| 2439 | if (path->nodes[1] == NULL) { |
| 2440 | ret = 0; |
| 2441 | goto out; |
| 2442 | } |
| 2443 | ret = 0; |
| 2444 | btrfs_node_key_to_cpu(path->nodes[1], &found_key, path->slots[1]); |
| 2445 | nritems = btrfs_header_nritems(path->nodes[1]); |
| 2446 | |
| 2447 | if (!nritems) |
| 2448 | goto out; |
| 2449 | |
| 2450 | if (path->slots[1] >= nritems) |
| 2451 | goto next_node; |
| 2452 | |
| 2453 | /* did we find a key greater than anything we want to delete? */ |
| 2454 | if (found_key.objectid > inode->i_ino || |
| 2455 | (found_key.objectid == inode->i_ino && found_key.type > key.type)) |
| 2456 | goto out; |
| 2457 | |
| 2458 | /* we check the next key in the node to make sure the leave contains |
| 2459 | * only checksum items. This comparison doesn't work if our |
| 2460 | * leaf is the last one in the node |
| 2461 | */ |
| 2462 | if (path->slots[1] + 1 >= nritems) { |
| 2463 | next_node: |
| 2464 | /* search forward from the last key in the node, this |
| 2465 | * will bring us into the next node in the tree |
| 2466 | */ |
| 2467 | btrfs_node_key_to_cpu(path->nodes[1], &found_key, nritems - 1); |
| 2468 | |
| 2469 | /* unlikely, but we inc below, so check to be safe */ |
| 2470 | if (found_key.offset == (u64)-1) |
| 2471 | goto out; |
| 2472 | |
| 2473 | /* search_forward needs a path with locks held, do the |
| 2474 | * search again for the original key. It is possible |
| 2475 | * this will race with a balance and return a path that |
| 2476 | * we could modify, but this drop is just an optimization |
| 2477 | * and is allowed to miss some leaves. |
| 2478 | */ |
| 2479 | btrfs_release_path(root, path); |
| 2480 | found_key.offset++; |
| 2481 | |
| 2482 | /* setup a max key for search_forward */ |
| 2483 | other_key.offset = (u64)-1; |
| 2484 | other_key.type = key.type; |
| 2485 | other_key.objectid = key.objectid; |
| 2486 | |
| 2487 | path->keep_locks = 1; |
| 2488 | ret = btrfs_search_forward(root, &found_key, &other_key, |
| 2489 | path, 0, 0); |
| 2490 | path->keep_locks = 0; |
| 2491 | if (ret || found_key.objectid != key.objectid || |
| 2492 | found_key.type != key.type) { |
| 2493 | ret = 0; |
| 2494 | goto out; |
| 2495 | } |
| 2496 | |
| 2497 | key.offset = found_key.offset; |
| 2498 | btrfs_release_path(root, path); |
| 2499 | cond_resched(); |
| 2500 | goto again; |
| 2501 | } |
| 2502 | |
| 2503 | /* we know there's one more slot after us in the tree, |
| 2504 | * read that key so we can verify it is also a checksum item |
| 2505 | */ |
| 2506 | btrfs_node_key_to_cpu(path->nodes[1], &other_key, path->slots[1] + 1); |
| 2507 | |
| 2508 | if (found_key.objectid < inode->i_ino) |
| 2509 | goto next_key; |
| 2510 | |
| 2511 | if (found_key.type != key.type || found_key.offset < new_size) |
| 2512 | goto next_key; |
| 2513 | |
| 2514 | /* |
| 2515 | * if the key for the next leaf isn't a csum key from this objectid, |
| 2516 | * we can't be sure there aren't good items inside this leaf. |
| 2517 | * Bail out |
| 2518 | */ |
| 2519 | if (other_key.objectid != inode->i_ino || other_key.type != key.type) |
| 2520 | goto out; |
| 2521 | |
Yan Zheng | 5b84e8d | 2008-10-09 11:46:19 -0400 | [diff] [blame] | 2522 | leaf_start = btrfs_node_blockptr(path->nodes[1], path->slots[1]); |
| 2523 | leaf_gen = btrfs_node_ptr_generation(path->nodes[1], path->slots[1]); |
Chris Mason | 323ac95 | 2008-10-01 19:05:46 -0400 | [diff] [blame] | 2524 | /* |
| 2525 | * it is safe to delete this leaf, it contains only |
| 2526 | * csum items from this inode at an offset >= new_size |
| 2527 | */ |
Yan Zheng | 5b84e8d | 2008-10-09 11:46:19 -0400 | [diff] [blame] | 2528 | ret = btrfs_del_leaf(trans, root, path, leaf_start); |
Chris Mason | 323ac95 | 2008-10-01 19:05:46 -0400 | [diff] [blame] | 2529 | BUG_ON(ret); |
| 2530 | |
Yan Zheng | 5b84e8d | 2008-10-09 11:46:19 -0400 | [diff] [blame] | 2531 | if (root->ref_cows && leaf_gen < trans->transid) { |
| 2532 | ref = btrfs_alloc_leaf_ref(root, 0); |
| 2533 | if (ref) { |
| 2534 | ref->root_gen = root->root_key.offset; |
| 2535 | ref->bytenr = leaf_start; |
| 2536 | ref->owner = 0; |
| 2537 | ref->generation = leaf_gen; |
| 2538 | ref->nritems = 0; |
| 2539 | |
Chris Mason | bd56b30 | 2009-02-04 09:27:02 -0500 | [diff] [blame] | 2540 | btrfs_sort_leaf_ref(ref); |
| 2541 | |
Yan Zheng | 5b84e8d | 2008-10-09 11:46:19 -0400 | [diff] [blame] | 2542 | ret = btrfs_add_leaf_ref(root, ref, 0); |
| 2543 | WARN_ON(ret); |
| 2544 | btrfs_free_leaf_ref(root, ref); |
| 2545 | } else { |
| 2546 | WARN_ON(1); |
| 2547 | } |
| 2548 | } |
Chris Mason | 323ac95 | 2008-10-01 19:05:46 -0400 | [diff] [blame] | 2549 | next_key: |
| 2550 | btrfs_release_path(root, path); |
| 2551 | |
| 2552 | if (other_key.objectid == inode->i_ino && |
| 2553 | other_key.type == key.type && other_key.offset > key.offset) { |
| 2554 | key.offset = other_key.offset; |
| 2555 | cond_resched(); |
| 2556 | goto again; |
| 2557 | } |
| 2558 | ret = 0; |
| 2559 | out: |
| 2560 | /* fixup any changes we've made to the path */ |
| 2561 | path->lowest_level = 0; |
| 2562 | path->keep_locks = 0; |
| 2563 | btrfs_release_path(root, path); |
| 2564 | return ret; |
| 2565 | } |
| 2566 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 2567 | #endif |
| 2568 | |
Chris Mason | 323ac95 | 2008-10-01 19:05:46 -0400 | [diff] [blame] | 2569 | /* |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2570 | * this can truncate away extent items, csum items and directory items. |
| 2571 | * 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] | 2572 | * any higher than new_size |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2573 | * |
| 2574 | * csum items that cross the new i_size are truncated to the new size |
| 2575 | * as well. |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 2576 | * |
| 2577 | * min_type is the minimum key type to truncate down to. If set to 0, this |
| 2578 | * 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] | 2579 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2580 | noinline int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
| 2581 | struct btrfs_root *root, |
| 2582 | struct inode *inode, |
| 2583 | u64 new_size, u32 min_type) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2584 | { |
| 2585 | int ret; |
| 2586 | struct btrfs_path *path; |
| 2587 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2588 | struct btrfs_key found_key; |
Chris Mason | 06d9a8d | 2009-02-04 09:30:58 -0500 | [diff] [blame] | 2589 | u32 found_type = (u8)-1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2590 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2591 | struct btrfs_file_extent_item *fi; |
| 2592 | u64 extent_start = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2593 | u64 extent_num_bytes = 0; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2594 | u64 extent_offset = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2595 | u64 item_end = 0; |
| 2596 | int found_extent; |
| 2597 | int del_item; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2598 | int pending_del_nr = 0; |
| 2599 | int pending_del_slot = 0; |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2600 | int extent_type = -1; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 2601 | int encoding; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 2602 | u64 mask = root->sectorsize - 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2603 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2604 | if (root->ref_cows) |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 2605 | btrfs_drop_extent_cache(inode, new_size & (~mask), (u64)-1, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2606 | path = btrfs_alloc_path(); |
Chris Mason | 3c69fae | 2007-08-07 15:52:22 -0400 | [diff] [blame] | 2607 | path->reada = -1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2608 | BUG_ON(!path); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2609 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2610 | /* FIXME, add redo link to tree so we don't leak on crash */ |
| 2611 | key.objectid = inode->i_ino; |
| 2612 | key.offset = (u64)-1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2613 | key.type = (u8)-1; |
| 2614 | |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2615 | search_again: |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2616 | path->leave_spinning = 1; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2617 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2618 | if (ret < 0) |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2619 | goto error; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2620 | |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2621 | if (ret > 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2622 | /* there are no items in the tree for us to truncate, we're |
| 2623 | * done |
| 2624 | */ |
| 2625 | if (path->slots[0] == 0) { |
| 2626 | ret = 0; |
| 2627 | goto error; |
| 2628 | } |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2629 | path->slots[0]--; |
| 2630 | } |
| 2631 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2632 | while (1) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2633 | fi = NULL; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2634 | leaf = path->nodes[0]; |
| 2635 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 2636 | found_type = btrfs_key_type(&found_key); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 2637 | encoding = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2638 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2639 | if (found_key.objectid != inode->i_ino) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2640 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2641 | |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2642 | if (found_type < min_type) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2643 | break; |
| 2644 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2645 | item_end = found_key.offset; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2646 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2647 | fi = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2648 | struct btrfs_file_extent_item); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2649 | extent_type = btrfs_file_extent_type(leaf, fi); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 2650 | encoding = btrfs_file_extent_compression(leaf, fi); |
| 2651 | encoding |= btrfs_file_extent_encryption(leaf, fi); |
| 2652 | encoding |= btrfs_file_extent_other_encoding(leaf, fi); |
| 2653 | |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2654 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2655 | item_end += |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2656 | btrfs_file_extent_num_bytes(leaf, fi); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2657 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2658 | item_end += btrfs_file_extent_inline_len(leaf, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 2659 | fi); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2660 | } |
Yan | 008630c | 2007-11-07 13:31:09 -0500 | [diff] [blame] | 2661 | item_end--; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2662 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2663 | if (item_end < new_size) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2664 | if (found_type == BTRFS_DIR_ITEM_KEY) |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2665 | found_type = BTRFS_INODE_ITEM_KEY; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2666 | else if (found_type == BTRFS_EXTENT_ITEM_KEY) |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 2667 | found_type = BTRFS_EXTENT_DATA_KEY; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2668 | else if (found_type == BTRFS_EXTENT_DATA_KEY) |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2669 | found_type = BTRFS_XATTR_ITEM_KEY; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2670 | else if (found_type == BTRFS_XATTR_ITEM_KEY) |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2671 | found_type = BTRFS_INODE_REF_KEY; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2672 | else if (found_type) |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2673 | found_type--; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2674 | else |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2675 | break; |
Yan | a61721d | 2007-09-17 11:08:38 -0400 | [diff] [blame] | 2676 | btrfs_set_key_type(&key, found_type); |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2677 | goto next; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2678 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2679 | if (found_key.offset >= new_size) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2680 | del_item = 1; |
| 2681 | else |
| 2682 | del_item = 0; |
| 2683 | found_extent = 0; |
| 2684 | |
| 2685 | /* FIXME, shrink the extent if the ref count is only 1 */ |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2686 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
| 2687 | goto delete; |
| 2688 | |
| 2689 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2690 | u64 num_dec; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2691 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 2692 | if (!del_item && !encoding) { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2693 | u64 orig_num_bytes = |
| 2694 | btrfs_file_extent_num_bytes(leaf, fi); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2695 | extent_num_bytes = new_size - |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2696 | found_key.offset + root->sectorsize - 1; |
Yan | b1632b1 | 2008-01-30 11:54:04 -0500 | [diff] [blame] | 2697 | extent_num_bytes = extent_num_bytes & |
| 2698 | ~((u64)root->sectorsize - 1); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2699 | btrfs_set_file_extent_num_bytes(leaf, fi, |
| 2700 | extent_num_bytes); |
| 2701 | num_dec = (orig_num_bytes - |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 2702 | extent_num_bytes); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2703 | if (root->ref_cows && extent_start != 0) |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 2704 | inode_sub_bytes(inode, num_dec); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 2705 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2706 | } else { |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2707 | extent_num_bytes = |
| 2708 | btrfs_file_extent_disk_num_bytes(leaf, |
| 2709 | fi); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2710 | extent_offset = found_key.offset - |
| 2711 | btrfs_file_extent_offset(leaf, fi); |
| 2712 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2713 | /* FIXME blocksize != 4096 */ |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 2714 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2715 | if (extent_start != 0) { |
| 2716 | found_extent = 1; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2717 | if (root->ref_cows) |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 2718 | inode_sub_bytes(inode, num_dec); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2719 | } |
| 2720 | } |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 2721 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 2722 | /* |
| 2723 | * we can't truncate inline items that have had |
| 2724 | * special encodings |
| 2725 | */ |
| 2726 | if (!del_item && |
| 2727 | btrfs_file_extent_compression(leaf, fi) == 0 && |
| 2728 | btrfs_file_extent_encryption(leaf, fi) == 0 && |
| 2729 | btrfs_file_extent_other_encoding(leaf, fi) == 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2730 | u32 size = new_size - found_key.offset; |
| 2731 | |
| 2732 | if (root->ref_cows) { |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 2733 | inode_sub_bytes(inode, item_end + 1 - |
| 2734 | new_size); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2735 | } |
| 2736 | size = |
| 2737 | btrfs_file_extent_calc_inline_size(size); |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 2738 | ret = btrfs_truncate_item(trans, root, path, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2739 | size, 1); |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 2740 | BUG_ON(ret); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 2741 | } else if (root->ref_cows) { |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 2742 | inode_sub_bytes(inode, item_end + 1 - |
| 2743 | found_key.offset); |
Chris Mason | 9069218 | 2008-02-08 13:49:28 -0500 | [diff] [blame] | 2744 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2745 | } |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 2746 | delete: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2747 | if (del_item) { |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2748 | if (!pending_del_nr) { |
| 2749 | /* no pending yet, add ourselves */ |
| 2750 | pending_del_slot = path->slots[0]; |
| 2751 | pending_del_nr = 1; |
| 2752 | } else if (pending_del_nr && |
| 2753 | path->slots[0] + 1 == pending_del_slot) { |
| 2754 | /* hop on the pending chunk */ |
| 2755 | pending_del_nr++; |
| 2756 | pending_del_slot = path->slots[0]; |
| 2757 | } else { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 2758 | BUG(); |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2759 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2760 | } else { |
| 2761 | break; |
| 2762 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2763 | if (found_extent && root->ref_cows) { |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 2764 | btrfs_set_path_blocking(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2765 | ret = btrfs_free_extent(trans, root, extent_start, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 2766 | extent_num_bytes, 0, |
| 2767 | btrfs_header_owner(leaf), |
| 2768 | inode->i_ino, extent_offset); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2769 | BUG_ON(ret); |
| 2770 | } |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2771 | next: |
| 2772 | if (path->slots[0] == 0) { |
| 2773 | if (pending_del_nr) |
| 2774 | goto del_pending; |
| 2775 | btrfs_release_path(root, path); |
Chris Mason | 06d9a8d | 2009-02-04 09:30:58 -0500 | [diff] [blame] | 2776 | if (found_type == BTRFS_INODE_ITEM_KEY) |
| 2777 | break; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2778 | goto search_again; |
| 2779 | } |
| 2780 | |
| 2781 | path->slots[0]--; |
| 2782 | if (pending_del_nr && |
| 2783 | path->slots[0] + 1 != pending_del_slot) { |
| 2784 | struct btrfs_key debug; |
| 2785 | del_pending: |
| 2786 | btrfs_item_key_to_cpu(path->nodes[0], &debug, |
| 2787 | pending_del_slot); |
| 2788 | ret = btrfs_del_items(trans, root, path, |
| 2789 | pending_del_slot, |
| 2790 | pending_del_nr); |
| 2791 | BUG_ON(ret); |
| 2792 | pending_del_nr = 0; |
| 2793 | btrfs_release_path(root, path); |
Chris Mason | 06d9a8d | 2009-02-04 09:30:58 -0500 | [diff] [blame] | 2794 | if (found_type == BTRFS_INODE_ITEM_KEY) |
| 2795 | break; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2796 | goto search_again; |
| 2797 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2798 | } |
| 2799 | ret = 0; |
| 2800 | error: |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 2801 | if (pending_del_nr) { |
| 2802 | ret = btrfs_del_items(trans, root, path, pending_del_slot, |
| 2803 | pending_del_nr); |
| 2804 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2805 | btrfs_free_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2806 | return ret; |
| 2807 | } |
| 2808 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2809 | /* |
| 2810 | * taken from block_truncate_page, but does cow as it zeros out |
| 2811 | * any bytes left in the last page in the file. |
| 2812 | */ |
| 2813 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) |
| 2814 | { |
| 2815 | struct inode *inode = mapping->host; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2816 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2817 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 2818 | struct btrfs_ordered_extent *ordered; |
| 2819 | char *kaddr; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 2820 | u32 blocksize = root->sectorsize; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2821 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
| 2822 | unsigned offset = from & (PAGE_CACHE_SIZE-1); |
| 2823 | struct page *page; |
| 2824 | int ret = 0; |
| 2825 | u64 page_start; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2826 | u64 page_end; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2827 | |
| 2828 | if ((offset & (blocksize - 1)) == 0) |
| 2829 | goto out; |
| 2830 | |
| 2831 | ret = -ENOMEM; |
Chris Mason | 211c17f | 2008-05-15 09:13:45 -0400 | [diff] [blame] | 2832 | again: |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2833 | page = grab_cache_page(mapping, index); |
| 2834 | if (!page) |
| 2835 | goto out; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2836 | |
| 2837 | page_start = page_offset(page); |
| 2838 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
| 2839 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2840 | if (!PageUptodate(page)) { |
| 2841 | ret = btrfs_readpage(NULL, page); |
| 2842 | lock_page(page); |
Chris Mason | 211c17f | 2008-05-15 09:13:45 -0400 | [diff] [blame] | 2843 | if (page->mapping != mapping) { |
| 2844 | unlock_page(page); |
| 2845 | page_cache_release(page); |
| 2846 | goto again; |
| 2847 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2848 | if (!PageUptodate(page)) { |
| 2849 | ret = -EIO; |
Chris Mason | 8964222 | 2008-07-24 09:41:53 -0400 | [diff] [blame] | 2850 | goto out_unlock; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 2851 | } |
| 2852 | } |
Chris Mason | 211c17f | 2008-05-15 09:13:45 -0400 | [diff] [blame] | 2853 | wait_on_page_writeback(page); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2854 | |
| 2855 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
| 2856 | set_page_extent_mapped(page); |
| 2857 | |
| 2858 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 2859 | if (ordered) { |
| 2860 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
| 2861 | unlock_page(page); |
| 2862 | page_cache_release(page); |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 2863 | btrfs_start_ordered_extent(inode, ordered, 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2864 | btrfs_put_ordered_extent(ordered); |
| 2865 | goto again; |
| 2866 | } |
| 2867 | |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 2868 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2869 | ret = 0; |
| 2870 | if (offset != PAGE_CACHE_SIZE) { |
| 2871 | kaddr = kmap(page); |
| 2872 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); |
| 2873 | flush_dcache_page(page); |
| 2874 | kunmap(page); |
| 2875 | } |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 2876 | ClearPageChecked(page); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 2877 | set_page_dirty(page); |
| 2878 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2879 | |
Chris Mason | 8964222 | 2008-07-24 09:41:53 -0400 | [diff] [blame] | 2880 | out_unlock: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2881 | unlock_page(page); |
| 2882 | page_cache_release(page); |
| 2883 | out: |
| 2884 | return ret; |
| 2885 | } |
| 2886 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 2887 | int btrfs_cont_expand(struct inode *inode, loff_t size) |
| 2888 | { |
| 2889 | struct btrfs_trans_handle *trans; |
| 2890 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 2891 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 2892 | struct extent_map *em; |
| 2893 | u64 mask = root->sectorsize - 1; |
| 2894 | u64 hole_start = (inode->i_size + mask) & ~mask; |
| 2895 | u64 block_end = (size + mask) & ~mask; |
| 2896 | u64 last_byte; |
| 2897 | u64 cur_offset; |
| 2898 | u64 hole_size; |
| 2899 | int err; |
| 2900 | |
| 2901 | if (size <= hole_start) |
| 2902 | return 0; |
| 2903 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 2904 | err = btrfs_check_metadata_free_space(root); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 2905 | if (err) |
| 2906 | return err; |
| 2907 | |
| 2908 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
| 2909 | |
| 2910 | while (1) { |
| 2911 | struct btrfs_ordered_extent *ordered; |
| 2912 | btrfs_wait_ordered_range(inode, hole_start, |
| 2913 | block_end - hole_start); |
| 2914 | lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
| 2915 | ordered = btrfs_lookup_ordered_extent(inode, hole_start); |
| 2916 | if (!ordered) |
| 2917 | break; |
| 2918 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
| 2919 | btrfs_put_ordered_extent(ordered); |
| 2920 | } |
| 2921 | |
| 2922 | trans = btrfs_start_transaction(root, 1); |
| 2923 | btrfs_set_trans_block_group(trans, inode); |
| 2924 | |
| 2925 | cur_offset = hole_start; |
| 2926 | while (1) { |
| 2927 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, |
| 2928 | block_end - cur_offset, 0); |
| 2929 | BUG_ON(IS_ERR(em) || !em); |
| 2930 | last_byte = min(extent_map_end(em), block_end); |
| 2931 | last_byte = (last_byte + mask) & ~mask; |
| 2932 | if (test_bit(EXTENT_FLAG_VACANCY, &em->flags)) { |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 2933 | u64 hint_byte = 0; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 2934 | hole_size = last_byte - cur_offset; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 2935 | err = btrfs_drop_extents(trans, root, inode, |
| 2936 | cur_offset, |
| 2937 | cur_offset + hole_size, |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 2938 | block_end, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 2939 | cur_offset, &hint_byte); |
| 2940 | if (err) |
| 2941 | break; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 2942 | err = btrfs_insert_file_extent(trans, root, |
| 2943 | inode->i_ino, cur_offset, 0, |
| 2944 | 0, hole_size, 0, hole_size, |
| 2945 | 0, 0, 0); |
| 2946 | btrfs_drop_extent_cache(inode, hole_start, |
| 2947 | last_byte - 1, 0); |
| 2948 | } |
| 2949 | free_extent_map(em); |
| 2950 | cur_offset = last_byte; |
| 2951 | if (err || cur_offset >= block_end) |
| 2952 | break; |
| 2953 | } |
| 2954 | |
| 2955 | btrfs_end_transaction(trans, root); |
| 2956 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
| 2957 | return err; |
| 2958 | } |
| 2959 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2960 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
| 2961 | { |
| 2962 | struct inode *inode = dentry->d_inode; |
| 2963 | int err; |
| 2964 | |
| 2965 | err = inode_change_ok(inode, attr); |
| 2966 | if (err) |
| 2967 | return err; |
| 2968 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 2969 | if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { |
| 2970 | if (attr->ia_size > inode->i_size) { |
| 2971 | err = btrfs_cont_expand(inode, attr->ia_size); |
| 2972 | if (err) |
| 2973 | return err; |
| 2974 | } else if (inode->i_size > 0 && |
| 2975 | attr->ia_size == 0) { |
| 2976 | |
| 2977 | /* we're truncating a file that used to have good |
| 2978 | * data down to zero. Make sure it gets into |
| 2979 | * the ordered flush list so that any new writes |
| 2980 | * get down to disk quickly. |
| 2981 | */ |
| 2982 | BTRFS_I(inode)->ordered_data_close = 1; |
| 2983 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2984 | } |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 2985 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2986 | err = inode_setattr(inode, attr); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 2987 | |
| 2988 | if (!err && ((attr->ia_valid & ATTR_MODE))) |
| 2989 | err = btrfs_acl_chmod(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2990 | return err; |
| 2991 | } |
Chris Mason | 61295eb | 2008-01-14 16:24:38 -0500 | [diff] [blame] | 2992 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2993 | void btrfs_delete_inode(struct inode *inode) |
| 2994 | { |
| 2995 | struct btrfs_trans_handle *trans; |
| 2996 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 2997 | unsigned long nr; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 2998 | int ret; |
| 2999 | |
| 3000 | truncate_inode_pages(&inode->i_data, 0); |
| 3001 | if (is_bad_inode(inode)) { |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3002 | btrfs_orphan_del(NULL, inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3003 | goto no_delete; |
| 3004 | } |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 3005 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3006 | |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 3007 | btrfs_i_size_write(inode, 0); |
Yan Zheng | 180591b | 2009-01-06 09:58:06 -0500 | [diff] [blame] | 3008 | trans = btrfs_join_transaction(root, 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3009 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3010 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3011 | ret = btrfs_truncate_inode_items(trans, root, inode, inode->i_size, 0); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3012 | if (ret) { |
| 3013 | btrfs_orphan_del(NULL, inode); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3014 | goto no_delete_lock; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3015 | } |
| 3016 | |
| 3017 | btrfs_orphan_del(trans, inode); |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3018 | |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3019 | nr = trans->blocks_used; |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 3020 | clear_inode(inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3021 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3022 | btrfs_end_transaction(trans, root); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3023 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3024 | return; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3025 | |
| 3026 | no_delete_lock: |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3027 | nr = trans->blocks_used; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3028 | btrfs_end_transaction(trans, root); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3029 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3030 | no_delete: |
| 3031 | clear_inode(inode); |
| 3032 | } |
| 3033 | |
| 3034 | /* |
| 3035 | * this returns the key found in the dir entry in the location pointer. |
| 3036 | * If no dir entries were found, location->objectid is 0. |
| 3037 | */ |
| 3038 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, |
| 3039 | struct btrfs_key *location) |
| 3040 | { |
| 3041 | const char *name = dentry->d_name.name; |
| 3042 | int namelen = dentry->d_name.len; |
| 3043 | struct btrfs_dir_item *di; |
| 3044 | struct btrfs_path *path; |
| 3045 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Yan | 0d9f7f3 | 2007-10-25 15:48:28 -0400 | [diff] [blame] | 3046 | int ret = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3047 | |
| 3048 | path = btrfs_alloc_path(); |
| 3049 | BUG_ON(!path); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3050 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3051 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
| 3052 | namelen, 0); |
Yan | 0d9f7f3 | 2007-10-25 15:48:28 -0400 | [diff] [blame] | 3053 | if (IS_ERR(di)) |
| 3054 | ret = PTR_ERR(di); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3055 | |
| 3056 | if (!di || IS_ERR(di)) |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3057 | goto out_err; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3058 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3059 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3060 | out: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3061 | btrfs_free_path(path); |
| 3062 | return ret; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3063 | out_err: |
| 3064 | location->objectid = 0; |
| 3065 | goto out; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3066 | } |
| 3067 | |
| 3068 | /* |
| 3069 | * when we hit a tree root in a directory, the btrfs part of the inode |
| 3070 | * needs to be changed to reflect the root directory of the tree root. This |
| 3071 | * is kind of like crossing a mount point. |
| 3072 | */ |
| 3073 | static int fixup_tree_root_location(struct btrfs_root *root, |
| 3074 | struct btrfs_key *location, |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 3075 | struct btrfs_root **sub_root, |
| 3076 | struct dentry *dentry) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3077 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3078 | struct btrfs_root_item *ri; |
| 3079 | |
| 3080 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) |
| 3081 | return 0; |
| 3082 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) |
| 3083 | return 0; |
| 3084 | |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 3085 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
| 3086 | dentry->d_name.name, |
| 3087 | dentry->d_name.len); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3088 | if (IS_ERR(*sub_root)) |
| 3089 | return PTR_ERR(*sub_root); |
| 3090 | |
| 3091 | ri = &(*sub_root)->root_item; |
| 3092 | location->objectid = btrfs_root_dirid(ri); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3093 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
| 3094 | location->offset = 0; |
| 3095 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3096 | return 0; |
| 3097 | } |
| 3098 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3099 | static void inode_tree_add(struct inode *inode) |
| 3100 | { |
| 3101 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3102 | struct btrfs_inode *entry; |
| 3103 | struct rb_node **p = &root->inode_tree.rb_node; |
| 3104 | struct rb_node *parent = NULL; |
| 3105 | |
| 3106 | spin_lock(&root->inode_lock); |
| 3107 | while (*p) { |
| 3108 | parent = *p; |
| 3109 | entry = rb_entry(parent, struct btrfs_inode, rb_node); |
| 3110 | |
| 3111 | if (inode->i_ino < entry->vfs_inode.i_ino) |
| 3112 | p = &(*p)->rb_left; |
| 3113 | else if (inode->i_ino > entry->vfs_inode.i_ino) |
| 3114 | p = &(*p)->rb_right; |
| 3115 | else { |
| 3116 | WARN_ON(!(entry->vfs_inode.i_state & |
| 3117 | (I_WILL_FREE | I_FREEING | I_CLEAR))); |
| 3118 | break; |
| 3119 | } |
| 3120 | } |
| 3121 | rb_link_node(&BTRFS_I(inode)->rb_node, parent, p); |
| 3122 | rb_insert_color(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
| 3123 | spin_unlock(&root->inode_lock); |
| 3124 | } |
| 3125 | |
| 3126 | static void inode_tree_del(struct inode *inode) |
| 3127 | { |
| 3128 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3129 | |
| 3130 | if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) { |
| 3131 | spin_lock(&root->inode_lock); |
| 3132 | rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
| 3133 | spin_unlock(&root->inode_lock); |
| 3134 | RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node); |
| 3135 | } |
| 3136 | } |
| 3137 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3138 | static noinline void init_btrfs_i(struct inode *inode) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3139 | { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3140 | struct btrfs_inode *bi = BTRFS_I(inode); |
| 3141 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3142 | bi->generation = 0; |
Chris Mason | c3027eb | 2008-12-08 16:40:21 -0500 | [diff] [blame] | 3143 | bi->sequence = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3144 | bi->last_trans = 0; |
| 3145 | bi->logged_trans = 0; |
| 3146 | bi->delalloc_bytes = 0; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3147 | bi->reserved_bytes = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3148 | bi->disk_i_size = 0; |
| 3149 | bi->flags = 0; |
| 3150 | bi->index_cnt = (u64)-1; |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 3151 | bi->last_unlink_trans = 0; |
Chris Mason | 2757495 | 2009-05-14 13:10:02 -0400 | [diff] [blame] | 3152 | bi->ordered_data_close = 0; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 3153 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
| 3154 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3155 | inode->i_mapping, GFP_NOFS); |
Chris Mason | 7e38326 | 2008-04-09 16:28:12 -0400 | [diff] [blame] | 3156 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
| 3157 | inode->i_mapping, GFP_NOFS); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 3158 | INIT_LIST_HEAD(&BTRFS_I(inode)->delalloc_inodes); |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 3159 | INIT_LIST_HEAD(&BTRFS_I(inode)->ordered_operations); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3160 | RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node); |
Chris Mason | ba1da2f | 2008-07-17 12:54:15 -0400 | [diff] [blame] | 3161 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
Chris Mason | ee6e650 | 2008-07-17 12:54:40 -0400 | [diff] [blame] | 3162 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3163 | mutex_init(&BTRFS_I(inode)->log_mutex); |
| 3164 | } |
| 3165 | |
| 3166 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
| 3167 | { |
| 3168 | struct btrfs_iget_args *args = p; |
| 3169 | inode->i_ino = args->ino; |
| 3170 | init_btrfs_i(inode); |
| 3171 | BTRFS_I(inode)->root = args->root; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3172 | btrfs_set_inode_space_info(args->root, inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3173 | return 0; |
| 3174 | } |
| 3175 | |
| 3176 | static int btrfs_find_actor(struct inode *inode, void *opaque) |
| 3177 | { |
| 3178 | struct btrfs_iget_args *args = opaque; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3179 | return args->ino == inode->i_ino && |
| 3180 | args->root == BTRFS_I(inode)->root; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3181 | } |
| 3182 | |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3183 | static struct inode *btrfs_iget_locked(struct super_block *s, |
| 3184 | u64 objectid, |
| 3185 | struct btrfs_root *root) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3186 | { |
| 3187 | struct inode *inode; |
| 3188 | struct btrfs_iget_args args; |
| 3189 | args.ino = objectid; |
| 3190 | args.root = root; |
| 3191 | |
| 3192 | inode = iget5_locked(s, objectid, btrfs_find_actor, |
| 3193 | btrfs_init_locked_inode, |
| 3194 | (void *)&args); |
| 3195 | return inode; |
| 3196 | } |
| 3197 | |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 3198 | /* Get an inode object given its location and corresponding root. |
| 3199 | * Returns in *is_new if the inode was read from disk |
| 3200 | */ |
| 3201 | struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3202 | struct btrfs_root *root) |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 3203 | { |
| 3204 | struct inode *inode; |
| 3205 | |
| 3206 | inode = btrfs_iget_locked(s, location->objectid, root); |
| 3207 | if (!inode) |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3208 | return ERR_PTR(-ENOMEM); |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 3209 | |
| 3210 | if (inode->i_state & I_NEW) { |
| 3211 | BTRFS_I(inode)->root = root; |
| 3212 | memcpy(&BTRFS_I(inode)->location, location, sizeof(*location)); |
| 3213 | btrfs_read_locked_inode(inode); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3214 | |
| 3215 | inode_tree_add(inode); |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 3216 | unlock_new_inode(inode); |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 3217 | } |
| 3218 | |
| 3219 | return inode; |
| 3220 | } |
| 3221 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 3222 | struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3223 | { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3224 | struct inode *inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3225 | struct btrfs_inode *bi = BTRFS_I(dir); |
| 3226 | struct btrfs_root *root = bi->root; |
| 3227 | struct btrfs_root *sub_root = root; |
| 3228 | struct btrfs_key location; |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3229 | int ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3230 | |
| 3231 | if (dentry->d_name.len > BTRFS_NAME_LEN) |
| 3232 | return ERR_PTR(-ENAMETOOLONG); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3233 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3234 | ret = btrfs_inode_by_name(dir, dentry, &location); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3235 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3236 | if (ret < 0) |
| 3237 | return ERR_PTR(ret); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3238 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3239 | inode = NULL; |
| 3240 | if (location.objectid) { |
Josef Bacik | 58176a9 | 2007-08-29 15:47:34 -0400 | [diff] [blame] | 3241 | ret = fixup_tree_root_location(root, &location, &sub_root, |
| 3242 | dentry); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3243 | if (ret < 0) |
| 3244 | return ERR_PTR(ret); |
| 3245 | if (ret > 0) |
| 3246 | return ERR_PTR(-ENOENT); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3247 | inode = btrfs_iget(dir->i_sb, &location, sub_root); |
Balaji Rao | 1a54ef8 | 2008-07-21 02:01:04 +0530 | [diff] [blame] | 3248 | if (IS_ERR(inode)) |
| 3249 | return ERR_CAST(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3250 | } |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 3251 | return inode; |
| 3252 | } |
| 3253 | |
| 3254 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
| 3255 | struct nameidata *nd) |
| 3256 | { |
| 3257 | struct inode *inode; |
| 3258 | |
| 3259 | if (dentry->d_name.len > BTRFS_NAME_LEN) |
| 3260 | return ERR_PTR(-ENAMETOOLONG); |
| 3261 | |
| 3262 | inode = btrfs_lookup_dentry(dir, dentry); |
| 3263 | if (IS_ERR(inode)) |
| 3264 | return ERR_CAST(inode); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 3265 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3266 | return d_splice_alias(inode, dentry); |
| 3267 | } |
| 3268 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3269 | static unsigned char btrfs_filetype_table[] = { |
| 3270 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK |
| 3271 | }; |
| 3272 | |
David Woodhouse | cbdf5a2 | 2008-08-06 19:42:33 +0100 | [diff] [blame] | 3273 | static int btrfs_real_readdir(struct file *filp, void *dirent, |
| 3274 | filldir_t filldir) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3275 | { |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 3276 | struct inode *inode = filp->f_dentry->d_inode; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3277 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3278 | struct btrfs_item *item; |
| 3279 | struct btrfs_dir_item *di; |
| 3280 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3281 | struct btrfs_key found_key; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3282 | struct btrfs_path *path; |
| 3283 | int ret; |
| 3284 | u32 nritems; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3285 | struct extent_buffer *leaf; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3286 | int slot; |
| 3287 | int advance; |
| 3288 | unsigned char d_type; |
| 3289 | int over = 0; |
| 3290 | u32 di_cur; |
| 3291 | u32 di_total; |
| 3292 | u32 di_len; |
| 3293 | int key_type = BTRFS_DIR_INDEX_KEY; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3294 | char tmp_name[32]; |
| 3295 | char *name_ptr; |
| 3296 | int name_len; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3297 | |
| 3298 | /* FIXME, use a real flag for deciding about the key type */ |
| 3299 | if (root->fs_info->tree_root == root) |
| 3300 | key_type = BTRFS_DIR_ITEM_KEY; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3301 | |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3302 | /* special case for "." */ |
| 3303 | if (filp->f_pos == 0) { |
| 3304 | over = filldir(dirent, ".", 1, |
| 3305 | 1, inode->i_ino, |
| 3306 | DT_DIR); |
| 3307 | if (over) |
| 3308 | return 0; |
| 3309 | filp->f_pos = 1; |
| 3310 | } |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3311 | /* special case for .., just use the back ref */ |
| 3312 | if (filp->f_pos == 1) { |
David Woodhouse | 5ecc7e5 | 2008-08-17 15:14:48 +0100 | [diff] [blame] | 3313 | u64 pino = parent_ino(filp->f_path.dentry); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3314 | over = filldir(dirent, "..", 2, |
David Woodhouse | 5ecc7e5 | 2008-08-17 15:14:48 +0100 | [diff] [blame] | 3315 | 2, pino, DT_DIR); |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3316 | if (over) |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 3317 | return 0; |
Chris Mason | 3954401 | 2007-12-12 14:38:19 -0500 | [diff] [blame] | 3318 | filp->f_pos = 2; |
| 3319 | } |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 3320 | path = btrfs_alloc_path(); |
| 3321 | path->reada = 2; |
| 3322 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3323 | btrfs_set_key_type(&key, key_type); |
| 3324 | key.offset = filp->f_pos; |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 3325 | key.objectid = inode->i_ino; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3326 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3327 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 3328 | if (ret < 0) |
| 3329 | goto err; |
| 3330 | advance = 0; |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 3331 | |
| 3332 | while (1) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3333 | leaf = path->nodes[0]; |
| 3334 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3335 | slot = path->slots[0]; |
| 3336 | if (advance || slot >= nritems) { |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 3337 | if (slot >= nritems - 1) { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3338 | ret = btrfs_next_leaf(root, path); |
| 3339 | if (ret) |
| 3340 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3341 | leaf = path->nodes[0]; |
| 3342 | nritems = btrfs_header_nritems(leaf); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3343 | slot = path->slots[0]; |
| 3344 | } else { |
| 3345 | slot++; |
| 3346 | path->slots[0]++; |
| 3347 | } |
| 3348 | } |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 3349 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3350 | advance = 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3351 | item = btrfs_item_nr(leaf, slot); |
| 3352 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
| 3353 | |
| 3354 | if (found_key.objectid != key.objectid) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3355 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3356 | if (btrfs_key_type(&found_key) != key_type) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3357 | break; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3358 | if (found_key.offset < filp->f_pos) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3359 | continue; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3360 | |
| 3361 | filp->f_pos = found_key.offset; |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 3362 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3363 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
| 3364 | di_cur = 0; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3365 | di_total = btrfs_item_size(leaf, item); |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 3366 | |
| 3367 | while (di_cur < di_total) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3368 | struct btrfs_key location; |
| 3369 | |
| 3370 | name_len = btrfs_dir_name_len(leaf, di); |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 3371 | if (name_len <= sizeof(tmp_name)) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3372 | name_ptr = tmp_name; |
| 3373 | } else { |
| 3374 | name_ptr = kmalloc(name_len, GFP_NOFS); |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 3375 | if (!name_ptr) { |
| 3376 | ret = -ENOMEM; |
| 3377 | goto err; |
| 3378 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3379 | } |
| 3380 | read_extent_buffer(leaf, name_ptr, |
| 3381 | (unsigned long)(di + 1), name_len); |
| 3382 | |
| 3383 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; |
| 3384 | btrfs_dir_item_key_to_cpu(leaf, di, &location); |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 3385 | |
| 3386 | /* is this a reference to our own snapshot? If so |
| 3387 | * skip it |
| 3388 | */ |
| 3389 | if (location.type == BTRFS_ROOT_ITEM_KEY && |
| 3390 | location.objectid == root->root_key.objectid) { |
| 3391 | over = 0; |
| 3392 | goto skip; |
| 3393 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3394 | over = filldir(dirent, name_ptr, name_len, |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 3395 | found_key.offset, location.objectid, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3396 | d_type); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3397 | |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 3398 | skip: |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3399 | if (name_ptr != tmp_name) |
| 3400 | kfree(name_ptr); |
| 3401 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3402 | if (over) |
| 3403 | goto nopos; |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 3404 | di_len = btrfs_dir_name_len(leaf, di) + |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 3405 | btrfs_dir_data_len(leaf, di) + sizeof(*di); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3406 | di_cur += di_len; |
| 3407 | di = (struct btrfs_dir_item *)((char *)di + di_len); |
| 3408 | } |
| 3409 | } |
David Woodhouse | 49593bf | 2008-08-17 17:08:36 +0100 | [diff] [blame] | 3410 | |
| 3411 | /* Reached end of directory/root. Bump pos past the last item. */ |
Yan Zheng | 5e591a0 | 2008-02-19 11:41:02 -0500 | [diff] [blame] | 3412 | if (key_type == BTRFS_DIR_INDEX_KEY) |
Chris Mason | 89f135d | 2009-01-28 15:34:27 -0500 | [diff] [blame] | 3413 | filp->f_pos = INT_LIMIT(off_t); |
Yan Zheng | 5e591a0 | 2008-02-19 11:41:02 -0500 | [diff] [blame] | 3414 | else |
| 3415 | filp->f_pos++; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3416 | nopos: |
| 3417 | ret = 0; |
| 3418 | err: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3419 | btrfs_free_path(path); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3420 | return ret; |
| 3421 | } |
| 3422 | |
| 3423 | int btrfs_write_inode(struct inode *inode, int wait) |
| 3424 | { |
| 3425 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3426 | struct btrfs_trans_handle *trans; |
| 3427 | int ret = 0; |
| 3428 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 3429 | if (root->fs_info->btree_inode == inode) |
Chris Mason | 4ca8b41 | 2008-08-05 13:30:48 -0400 | [diff] [blame] | 3430 | return 0; |
| 3431 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3432 | if (wait) { |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 3433 | trans = btrfs_join_transaction(root, 1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3434 | btrfs_set_trans_block_group(trans, inode); |
| 3435 | ret = btrfs_commit_transaction(trans, root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3436 | } |
| 3437 | return ret; |
| 3438 | } |
| 3439 | |
| 3440 | /* |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3441 | * This is somewhat expensive, updating the tree every time the |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3442 | * inode changes. But, it is most likely to find the inode in cache. |
| 3443 | * FIXME, needs more benchmarking...there are no reasons other than performance |
| 3444 | * to keep or drop this code. |
| 3445 | */ |
| 3446 | void btrfs_dirty_inode(struct inode *inode) |
| 3447 | { |
| 3448 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3449 | struct btrfs_trans_handle *trans; |
| 3450 | |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 3451 | trans = btrfs_join_transaction(root, 1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3452 | btrfs_set_trans_block_group(trans, inode); |
| 3453 | btrfs_update_inode(trans, root, inode); |
| 3454 | btrfs_end_transaction(trans, root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3455 | } |
| 3456 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 3457 | /* |
| 3458 | * find the highest existing sequence number in a directory |
| 3459 | * and then set the in-memory index_cnt variable to reflect |
| 3460 | * free sequence numbers |
| 3461 | */ |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3462 | static int btrfs_set_inode_index_count(struct inode *inode) |
| 3463 | { |
| 3464 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 3465 | struct btrfs_key key, found_key; |
| 3466 | struct btrfs_path *path; |
| 3467 | struct extent_buffer *leaf; |
| 3468 | int ret; |
| 3469 | |
| 3470 | key.objectid = inode->i_ino; |
| 3471 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); |
| 3472 | key.offset = (u64)-1; |
| 3473 | |
| 3474 | path = btrfs_alloc_path(); |
| 3475 | if (!path) |
| 3476 | return -ENOMEM; |
| 3477 | |
| 3478 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
| 3479 | if (ret < 0) |
| 3480 | goto out; |
| 3481 | /* FIXME: we should be able to handle this */ |
| 3482 | if (ret == 0) |
| 3483 | goto out; |
| 3484 | ret = 0; |
| 3485 | |
| 3486 | /* |
| 3487 | * MAGIC NUMBER EXPLANATION: |
| 3488 | * since we search a directory based on f_pos we have to start at 2 |
| 3489 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody |
| 3490 | * else has to start at 2 |
| 3491 | */ |
| 3492 | if (path->slots[0] == 0) { |
| 3493 | BTRFS_I(inode)->index_cnt = 2; |
| 3494 | goto out; |
| 3495 | } |
| 3496 | |
| 3497 | path->slots[0]--; |
| 3498 | |
| 3499 | leaf = path->nodes[0]; |
| 3500 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 3501 | |
| 3502 | if (found_key.objectid != inode->i_ino || |
| 3503 | btrfs_key_type(&found_key) != BTRFS_DIR_INDEX_KEY) { |
| 3504 | BTRFS_I(inode)->index_cnt = 2; |
| 3505 | goto out; |
| 3506 | } |
| 3507 | |
| 3508 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; |
| 3509 | out: |
| 3510 | btrfs_free_path(path); |
| 3511 | return ret; |
| 3512 | } |
| 3513 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 3514 | /* |
| 3515 | * helper to find a free sequence number in a given directory. This current |
| 3516 | * code is very simple, later versions will do smarter things in the btree |
| 3517 | */ |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 3518 | int btrfs_set_inode_index(struct inode *dir, u64 *index) |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3519 | { |
| 3520 | int ret = 0; |
| 3521 | |
| 3522 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { |
| 3523 | ret = btrfs_set_inode_index_count(dir); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 3524 | if (ret) |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3525 | return ret; |
| 3526 | } |
| 3527 | |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3528 | *index = BTRFS_I(dir)->index_cnt; |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3529 | BTRFS_I(dir)->index_cnt++; |
| 3530 | |
| 3531 | return ret; |
| 3532 | } |
| 3533 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3534 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
| 3535 | struct btrfs_root *root, |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3536 | struct inode *dir, |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3537 | const char *name, int name_len, |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3538 | u64 ref_objectid, u64 objectid, |
| 3539 | u64 alloc_hint, int mode, u64 *index) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3540 | { |
| 3541 | struct inode *inode; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3542 | struct btrfs_inode_item *inode_item; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3543 | struct btrfs_key *location; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3544 | struct btrfs_path *path; |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3545 | struct btrfs_inode_ref *ref; |
| 3546 | struct btrfs_key key[2]; |
| 3547 | u32 sizes[2]; |
| 3548 | unsigned long ptr; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3549 | int ret; |
| 3550 | int owner; |
| 3551 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3552 | path = btrfs_alloc_path(); |
| 3553 | BUG_ON(!path); |
| 3554 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3555 | inode = new_inode(root->fs_info->sb); |
| 3556 | if (!inode) |
| 3557 | return ERR_PTR(-ENOMEM); |
| 3558 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3559 | if (dir) { |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 3560 | ret = btrfs_set_inode_index(dir, index); |
Shen Feng | 0977143 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 3561 | if (ret) { |
| 3562 | iput(inode); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3563 | return ERR_PTR(ret); |
Shen Feng | 0977143 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 3564 | } |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3565 | } |
| 3566 | /* |
| 3567 | * index_cnt is ignored for everything but a dir, |
| 3568 | * btrfs_get_inode_index_count has an explanation for the magic |
| 3569 | * number |
| 3570 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3571 | init_btrfs_i(inode); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3572 | BTRFS_I(inode)->index_cnt = 2; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3573 | BTRFS_I(inode)->root = root; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3574 | BTRFS_I(inode)->generation = trans->transid; |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3575 | btrfs_set_inode_space_info(root, inode); |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 3576 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3577 | if (mode & S_IFDIR) |
| 3578 | owner = 0; |
| 3579 | else |
| 3580 | owner = 1; |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 3581 | BTRFS_I(inode)->block_group = |
| 3582 | btrfs_find_block_group(root, 0, alloc_hint, owner); |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3583 | |
| 3584 | key[0].objectid = objectid; |
| 3585 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); |
| 3586 | key[0].offset = 0; |
| 3587 | |
| 3588 | key[1].objectid = objectid; |
| 3589 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); |
| 3590 | key[1].offset = ref_objectid; |
| 3591 | |
| 3592 | sizes[0] = sizeof(struct btrfs_inode_item); |
| 3593 | sizes[1] = name_len + sizeof(*ref); |
| 3594 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 3595 | path->leave_spinning = 1; |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3596 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); |
| 3597 | if (ret != 0) |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3598 | goto fail; |
| 3599 | |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3600 | if (objectid > root->highest_inode) |
| 3601 | root->highest_inode = objectid; |
| 3602 | |
Chris Mason | 79683f2 | 2008-11-19 22:00:53 -0500 | [diff] [blame] | 3603 | inode->i_uid = current_fsuid(); |
Chris Ball | 8c087b5 | 2009-02-04 09:29:54 -0500 | [diff] [blame] | 3604 | |
Chris Mason | 42f15d7 | 2009-02-06 11:35:57 -0500 | [diff] [blame] | 3605 | if (dir && (dir->i_mode & S_ISGID)) { |
Chris Ball | 8c087b5 | 2009-02-04 09:29:54 -0500 | [diff] [blame] | 3606 | inode->i_gid = dir->i_gid; |
| 3607 | if (S_ISDIR(mode)) |
| 3608 | mode |= S_ISGID; |
| 3609 | } else |
| 3610 | inode->i_gid = current_fsgid(); |
| 3611 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3612 | inode->i_mode = mode; |
| 3613 | inode->i_ino = objectid; |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 3614 | inode_set_bytes(inode, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3615 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3616 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 3617 | struct btrfs_inode_item); |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3618 | fill_inode_item(trans, path->nodes[0], inode_item, inode); |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3619 | |
| 3620 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, |
| 3621 | struct btrfs_inode_ref); |
| 3622 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3623 | btrfs_set_inode_ref_index(path->nodes[0], ref, *index); |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3624 | ptr = (unsigned long)(ref + 1); |
| 3625 | write_extent_buffer(path->nodes[0], name, ptr, name_len); |
| 3626 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3627 | btrfs_mark_buffer_dirty(path->nodes[0]); |
| 3628 | btrfs_free_path(path); |
| 3629 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3630 | location = &BTRFS_I(inode)->location; |
| 3631 | location->objectid = objectid; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3632 | location->offset = 0; |
| 3633 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
| 3634 | |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 3635 | btrfs_inherit_iflags(inode, dir); |
| 3636 | |
Chris Mason | 9427216 | 2009-07-02 12:26:06 -0400 | [diff] [blame] | 3637 | if ((mode & S_IFREG)) { |
| 3638 | if (btrfs_test_opt(root, NODATASUM)) |
| 3639 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; |
| 3640 | if (btrfs_test_opt(root, NODATACOW)) |
| 3641 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
| 3642 | } |
| 3643 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3644 | insert_inode_hash(inode); |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 3645 | inode_tree_add(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3646 | return inode; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3647 | fail: |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3648 | if (dir) |
| 3649 | BTRFS_I(dir)->index_cnt--; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3650 | btrfs_free_path(path); |
Shen Feng | 0977143 | 2009-04-02 16:46:06 -0400 | [diff] [blame] | 3651 | iput(inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3652 | return ERR_PTR(ret); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3653 | } |
| 3654 | |
| 3655 | static inline u8 btrfs_inode_type(struct inode *inode) |
| 3656 | { |
| 3657 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; |
| 3658 | } |
| 3659 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 3660 | /* |
| 3661 | * utility function to add 'inode' into 'parent_inode' with |
| 3662 | * a give name and a given sequence number. |
| 3663 | * if 'add_backref' is true, also insert a backref from the |
| 3664 | * inode to the parent directory. |
| 3665 | */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3666 | int btrfs_add_link(struct btrfs_trans_handle *trans, |
| 3667 | struct inode *parent_inode, struct inode *inode, |
| 3668 | const char *name, int name_len, int add_backref, u64 index) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3669 | { |
| 3670 | int ret; |
| 3671 | struct btrfs_key key; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3672 | struct btrfs_root *root = BTRFS_I(parent_inode)->root; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3673 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3674 | key.objectid = inode->i_ino; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3675 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
| 3676 | key.offset = 0; |
| 3677 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3678 | ret = btrfs_insert_dir_item(trans, root, name, name_len, |
| 3679 | parent_inode->i_ino, |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3680 | &key, btrfs_inode_type(inode), |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3681 | index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3682 | if (ret == 0) { |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3683 | if (add_backref) { |
| 3684 | ret = btrfs_insert_inode_ref(trans, root, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3685 | name, name_len, |
| 3686 | inode->i_ino, |
| 3687 | parent_inode->i_ino, |
| 3688 | index); |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3689 | } |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 3690 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3691 | name_len * 2); |
Chris Mason | 79c4458 | 2007-06-25 10:09:33 -0400 | [diff] [blame] | 3692 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3693 | ret = btrfs_update_inode(trans, root, parent_inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3694 | } |
| 3695 | return ret; |
| 3696 | } |
| 3697 | |
| 3698 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3699 | struct dentry *dentry, struct inode *inode, |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3700 | int backref, u64 index) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3701 | { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3702 | int err = btrfs_add_link(trans, dentry->d_parent->d_inode, |
| 3703 | inode, dentry->d_name.name, |
| 3704 | dentry->d_name.len, backref, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3705 | if (!err) { |
| 3706 | d_instantiate(dentry, inode); |
| 3707 | return 0; |
| 3708 | } |
| 3709 | if (err > 0) |
| 3710 | err = -EEXIST; |
| 3711 | return err; |
| 3712 | } |
| 3713 | |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 3714 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
| 3715 | int mode, dev_t rdev) |
| 3716 | { |
| 3717 | struct btrfs_trans_handle *trans; |
| 3718 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3719 | struct inode *inode = NULL; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 3720 | int err; |
| 3721 | int drop_inode = 0; |
| 3722 | u64 objectid; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3723 | unsigned long nr = 0; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3724 | u64 index = 0; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 3725 | |
| 3726 | if (!new_valid_dev(rdev)) |
| 3727 | return -EINVAL; |
| 3728 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3729 | err = btrfs_check_metadata_free_space(root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3730 | if (err) |
| 3731 | goto fail; |
| 3732 | |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 3733 | trans = btrfs_start_transaction(root, 1); |
| 3734 | btrfs_set_trans_block_group(trans, dir); |
| 3735 | |
| 3736 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); |
| 3737 | if (err) { |
| 3738 | err = -ENOSPC; |
| 3739 | goto out_unlock; |
| 3740 | } |
| 3741 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3742 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3743 | dentry->d_name.len, |
| 3744 | dentry->d_parent->d_inode->i_ino, objectid, |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3745 | BTRFS_I(dir)->block_group, mode, &index); |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 3746 | err = PTR_ERR(inode); |
| 3747 | if (IS_ERR(inode)) |
| 3748 | goto out_unlock; |
| 3749 | |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 3750 | err = btrfs_init_inode_security(inode, dir); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 3751 | if (err) { |
| 3752 | drop_inode = 1; |
| 3753 | goto out_unlock; |
| 3754 | } |
| 3755 | |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 3756 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3757 | err = btrfs_add_nondir(trans, dentry, inode, 0, index); |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 3758 | if (err) |
| 3759 | drop_inode = 1; |
| 3760 | else { |
| 3761 | inode->i_op = &btrfs_special_inode_operations; |
| 3762 | init_special_inode(inode, inode->i_mode, rdev); |
Yan | 1b4ab1b | 2007-08-29 09:11:44 -0400 | [diff] [blame] | 3763 | btrfs_update_inode(trans, root, inode); |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 3764 | } |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 3765 | btrfs_update_inode_block_group(trans, inode); |
| 3766 | btrfs_update_inode_block_group(trans, dir); |
| 3767 | out_unlock: |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3768 | nr = trans->blocks_used; |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 3769 | btrfs_end_transaction_throttle(trans, root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3770 | fail: |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 3771 | if (drop_inode) { |
| 3772 | inode_dec_link_count(inode); |
| 3773 | iput(inode); |
| 3774 | } |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3775 | btrfs_btree_balance_dirty(root, nr); |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 3776 | return err; |
| 3777 | } |
| 3778 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3779 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
| 3780 | int mode, struct nameidata *nd) |
| 3781 | { |
| 3782 | struct btrfs_trans_handle *trans; |
| 3783 | struct btrfs_root *root = BTRFS_I(dir)->root; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3784 | struct inode *inode = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3785 | int err; |
| 3786 | int drop_inode = 0; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3787 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3788 | u64 objectid; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3789 | u64 index = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3790 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3791 | err = btrfs_check_metadata_free_space(root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3792 | if (err) |
| 3793 | goto fail; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3794 | trans = btrfs_start_transaction(root, 1); |
| 3795 | btrfs_set_trans_block_group(trans, dir); |
| 3796 | |
| 3797 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); |
| 3798 | if (err) { |
| 3799 | err = -ENOSPC; |
| 3800 | goto out_unlock; |
| 3801 | } |
| 3802 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3803 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3804 | dentry->d_name.len, |
| 3805 | dentry->d_parent->d_inode->i_ino, |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3806 | objectid, BTRFS_I(dir)->block_group, mode, |
| 3807 | &index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3808 | err = PTR_ERR(inode); |
| 3809 | if (IS_ERR(inode)) |
| 3810 | goto out_unlock; |
| 3811 | |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 3812 | err = btrfs_init_inode_security(inode, dir); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 3813 | if (err) { |
| 3814 | drop_inode = 1; |
| 3815 | goto out_unlock; |
| 3816 | } |
| 3817 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3818 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3819 | err = btrfs_add_nondir(trans, dentry, inode, 0, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3820 | if (err) |
| 3821 | drop_inode = 1; |
| 3822 | else { |
| 3823 | inode->i_mapping->a_ops = &btrfs_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 3824 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3825 | inode->i_fop = &btrfs_file_operations; |
| 3826 | inode->i_op = &btrfs_file_inode_operations; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 3827 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3828 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3829 | btrfs_update_inode_block_group(trans, inode); |
| 3830 | btrfs_update_inode_block_group(trans, dir); |
| 3831 | out_unlock: |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3832 | nr = trans->blocks_used; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 3833 | btrfs_end_transaction_throttle(trans, root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3834 | fail: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3835 | if (drop_inode) { |
| 3836 | inode_dec_link_count(inode); |
| 3837 | iput(inode); |
| 3838 | } |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3839 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3840 | return err; |
| 3841 | } |
| 3842 | |
| 3843 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, |
| 3844 | struct dentry *dentry) |
| 3845 | { |
| 3846 | struct btrfs_trans_handle *trans; |
| 3847 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 3848 | struct inode *inode = old_dentry->d_inode; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3849 | u64 index; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3850 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3851 | int err; |
| 3852 | int drop_inode = 0; |
| 3853 | |
| 3854 | if (inode->i_nlink == 0) |
| 3855 | return -ENOENT; |
| 3856 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3857 | btrfs_inc_nlink(inode); |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3858 | err = btrfs_check_metadata_free_space(root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3859 | if (err) |
| 3860 | goto fail; |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 3861 | err = btrfs_set_inode_index(dir, &index); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3862 | if (err) |
| 3863 | goto fail; |
| 3864 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3865 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3866 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3867 | btrfs_set_trans_block_group(trans, dir); |
| 3868 | atomic_inc(&inode->i_count); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3869 | |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3870 | err = btrfs_add_nondir(trans, dentry, inode, 1, index); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3871 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3872 | if (err) |
| 3873 | drop_inode = 1; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3874 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3875 | btrfs_update_inode_block_group(trans, dir); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3876 | err = btrfs_update_inode(trans, root, inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3877 | |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 3878 | if (err) |
| 3879 | drop_inode = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3880 | |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3881 | nr = trans->blocks_used; |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 3882 | |
| 3883 | btrfs_log_new_name(trans, inode, NULL, dentry->d_parent); |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 3884 | btrfs_end_transaction_throttle(trans, root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3885 | fail: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3886 | if (drop_inode) { |
| 3887 | inode_dec_link_count(inode); |
| 3888 | iput(inode); |
| 3889 | } |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3890 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3891 | return err; |
| 3892 | } |
| 3893 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3894 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 3895 | { |
Chris Mason | b9d8666 | 2008-05-02 16:13:49 -0400 | [diff] [blame] | 3896 | struct inode *inode = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3897 | struct btrfs_trans_handle *trans; |
| 3898 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 3899 | int err = 0; |
| 3900 | int drop_on_err = 0; |
Chris Mason | b9d8666 | 2008-05-02 16:13:49 -0400 | [diff] [blame] | 3901 | u64 objectid = 0; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3902 | u64 index = 0; |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3903 | unsigned long nr = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3904 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 3905 | err = btrfs_check_metadata_free_space(root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 3906 | if (err) |
| 3907 | goto out_unlock; |
| 3908 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3909 | trans = btrfs_start_transaction(root, 1); |
| 3910 | btrfs_set_trans_block_group(trans, dir); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3911 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3912 | if (IS_ERR(trans)) { |
| 3913 | err = PTR_ERR(trans); |
| 3914 | goto out_unlock; |
| 3915 | } |
| 3916 | |
| 3917 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); |
| 3918 | if (err) { |
| 3919 | err = -ENOSPC; |
| 3920 | goto out_unlock; |
| 3921 | } |
| 3922 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 3923 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 3924 | dentry->d_name.len, |
| 3925 | dentry->d_parent->d_inode->i_ino, objectid, |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 3926 | BTRFS_I(dir)->block_group, S_IFDIR | mode, |
| 3927 | &index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3928 | if (IS_ERR(inode)) { |
| 3929 | err = PTR_ERR(inode); |
| 3930 | goto out_fail; |
| 3931 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3932 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3933 | drop_on_err = 1; |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 3934 | |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 3935 | err = btrfs_init_inode_security(inode, dir); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 3936 | if (err) |
| 3937 | goto out_fail; |
| 3938 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3939 | inode->i_op = &btrfs_dir_inode_operations; |
| 3940 | inode->i_fop = &btrfs_dir_file_operations; |
| 3941 | btrfs_set_trans_block_group(trans, inode); |
| 3942 | |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 3943 | btrfs_i_size_write(inode, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3944 | err = btrfs_update_inode(trans, root, inode); |
| 3945 | if (err) |
| 3946 | goto out_fail; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3947 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 3948 | err = btrfs_add_link(trans, dentry->d_parent->d_inode, |
| 3949 | inode, dentry->d_name.name, |
| 3950 | dentry->d_name.len, 0, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3951 | if (err) |
| 3952 | goto out_fail; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3953 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3954 | d_instantiate(dentry, inode); |
| 3955 | drop_on_err = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3956 | btrfs_update_inode_block_group(trans, inode); |
| 3957 | btrfs_update_inode_block_group(trans, dir); |
| 3958 | |
| 3959 | out_fail: |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3960 | nr = trans->blocks_used; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 3961 | btrfs_end_transaction_throttle(trans, root); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 3962 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3963 | out_unlock: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3964 | if (drop_on_err) |
| 3965 | iput(inode); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 3966 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 3967 | return err; |
| 3968 | } |
| 3969 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 3970 | /* helper for btfs_get_extent. Given an existing extent in the tree, |
| 3971 | * and an extent that you want to insert, deal with overlap and insert |
| 3972 | * the new extent into the tree. |
| 3973 | */ |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 3974 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
| 3975 | struct extent_map *existing, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3976 | struct extent_map *em, |
| 3977 | u64 map_start, u64 map_len) |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 3978 | { |
| 3979 | u64 start_diff; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 3980 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3981 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
| 3982 | start_diff = map_start - em->start; |
| 3983 | em->start = map_start; |
| 3984 | em->len = map_len; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 3985 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
| 3986 | !test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3987 | em->block_start += start_diff; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 3988 | em->block_len -= start_diff; |
| 3989 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 3990 | return add_extent_mapping(em_tree, em); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 3991 | } |
| 3992 | |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 3993 | static noinline int uncompress_inline(struct btrfs_path *path, |
| 3994 | struct inode *inode, struct page *page, |
| 3995 | size_t pg_offset, u64 extent_offset, |
| 3996 | struct btrfs_file_extent_item *item) |
| 3997 | { |
| 3998 | int ret; |
| 3999 | struct extent_buffer *leaf = path->nodes[0]; |
| 4000 | char *tmp; |
| 4001 | size_t max_size; |
| 4002 | unsigned long inline_size; |
| 4003 | unsigned long ptr; |
| 4004 | |
| 4005 | WARN_ON(pg_offset != 0); |
| 4006 | max_size = btrfs_file_extent_ram_bytes(leaf, item); |
| 4007 | inline_size = btrfs_file_extent_inline_item_len(leaf, |
| 4008 | btrfs_item_nr(leaf, path->slots[0])); |
| 4009 | tmp = kmalloc(inline_size, GFP_NOFS); |
| 4010 | ptr = btrfs_file_extent_inline_start(item); |
| 4011 | |
| 4012 | read_extent_buffer(leaf, tmp, ptr, inline_size); |
| 4013 | |
Chris Mason | 5b050f0 | 2008-11-11 09:34:41 -0500 | [diff] [blame] | 4014 | max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4015 | ret = btrfs_zlib_decompress(tmp, page, extent_offset, |
| 4016 | inline_size, max_size); |
| 4017 | if (ret) { |
| 4018 | char *kaddr = kmap_atomic(page, KM_USER0); |
| 4019 | unsigned long copy_size = min_t(u64, |
| 4020 | PAGE_CACHE_SIZE - pg_offset, |
| 4021 | max_size - extent_offset); |
| 4022 | memset(kaddr + pg_offset, 0, copy_size); |
| 4023 | kunmap_atomic(kaddr, KM_USER0); |
| 4024 | } |
| 4025 | kfree(tmp); |
| 4026 | return 0; |
| 4027 | } |
| 4028 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4029 | /* |
| 4030 | * 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] | 4031 | * the ugly parts come from merging extents from the disk with the in-ram |
| 4032 | * representation. This gets more complex because of the data=ordered code, |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4033 | * where the in-ram extents might be locked pending data=ordered completion. |
| 4034 | * |
| 4035 | * This also copies inline extents directly into the page. |
| 4036 | */ |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4037 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4038 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 4039 | size_t pg_offset, u64 start, u64 len, |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4040 | int create) |
| 4041 | { |
| 4042 | int ret; |
| 4043 | int err = 0; |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 4044 | u64 bytenr; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4045 | u64 extent_start = 0; |
| 4046 | u64 extent_end = 0; |
| 4047 | u64 objectid = inode->i_ino; |
| 4048 | u32 found_type; |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 4049 | struct btrfs_path *path = NULL; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4050 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4051 | struct btrfs_file_extent_item *item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4052 | struct extent_buffer *leaf; |
| 4053 | struct btrfs_key found_key; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4054 | struct extent_map *em = NULL; |
| 4055 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4056 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4057 | struct btrfs_trans_handle *trans = NULL; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4058 | int compressed; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4059 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4060 | again: |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4061 | spin_lock(&em_tree->lock); |
| 4062 | em = lookup_extent_mapping(em_tree, start, len); |
Chris Mason | a061fc8 | 2008-05-07 11:43:44 -0400 | [diff] [blame] | 4063 | if (em) |
| 4064 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4065 | spin_unlock(&em_tree->lock); |
| 4066 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4067 | if (em) { |
Chris Mason | e1c4b74 | 2008-04-22 13:26:46 -0400 | [diff] [blame] | 4068 | if (em->start > start || em->start + em->len <= start) |
| 4069 | free_extent_map(em); |
| 4070 | else if (em->block_start == EXTENT_MAP_INLINE && page) |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 4071 | free_extent_map(em); |
| 4072 | else |
| 4073 | goto out; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4074 | } |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4075 | em = alloc_extent_map(GFP_NOFS); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4076 | if (!em) { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4077 | err = -ENOMEM; |
| 4078 | goto out; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4079 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4080 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4081 | em->start = EXTENT_MAP_HOLE; |
Chris Mason | 445a694 | 2008-11-10 11:53:33 -0500 | [diff] [blame] | 4082 | em->orig_start = EXTENT_MAP_HOLE; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4083 | em->len = (u64)-1; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4084 | em->block_len = (u64)-1; |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 4085 | |
| 4086 | if (!path) { |
| 4087 | path = btrfs_alloc_path(); |
| 4088 | BUG_ON(!path); |
| 4089 | } |
| 4090 | |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 4091 | ret = btrfs_lookup_file_extent(trans, root, path, |
| 4092 | objectid, start, trans != NULL); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4093 | if (ret < 0) { |
| 4094 | err = ret; |
| 4095 | goto out; |
| 4096 | } |
| 4097 | |
| 4098 | if (ret != 0) { |
| 4099 | if (path->slots[0] == 0) |
| 4100 | goto not_found; |
| 4101 | path->slots[0]--; |
| 4102 | } |
| 4103 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4104 | leaf = path->nodes[0]; |
| 4105 | item = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4106 | struct btrfs_file_extent_item); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4107 | /* are we inside the extent that was found? */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4108 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 4109 | found_type = btrfs_key_type(&found_key); |
| 4110 | if (found_key.objectid != objectid || |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4111 | found_type != BTRFS_EXTENT_DATA_KEY) { |
| 4112 | goto not_found; |
| 4113 | } |
| 4114 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4115 | found_type = btrfs_file_extent_type(leaf, item); |
| 4116 | extent_start = found_key.offset; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4117 | compressed = btrfs_file_extent_compression(leaf, item); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4118 | if (found_type == BTRFS_FILE_EXTENT_REG || |
| 4119 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4120 | extent_end = extent_start + |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 4121 | btrfs_file_extent_num_bytes(leaf, item); |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 4122 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
| 4123 | size_t size; |
| 4124 | size = btrfs_file_extent_inline_len(leaf, item); |
| 4125 | extent_end = (extent_start + size + root->sectorsize - 1) & |
| 4126 | ~((u64)root->sectorsize - 1); |
| 4127 | } |
| 4128 | |
| 4129 | if (start >= extent_end) { |
| 4130 | path->slots[0]++; |
| 4131 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
| 4132 | ret = btrfs_next_leaf(root, path); |
| 4133 | if (ret < 0) { |
| 4134 | err = ret; |
| 4135 | goto out; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4136 | } |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 4137 | if (ret > 0) |
| 4138 | goto not_found; |
| 4139 | leaf = path->nodes[0]; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4140 | } |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 4141 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
| 4142 | if (found_key.objectid != objectid || |
| 4143 | found_key.type != BTRFS_EXTENT_DATA_KEY) |
| 4144 | goto not_found; |
| 4145 | if (start + len <= found_key.offset) |
| 4146 | goto not_found; |
| 4147 | em->start = start; |
| 4148 | em->len = found_key.offset - start; |
| 4149 | goto not_found_em; |
| 4150 | } |
| 4151 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4152 | if (found_type == BTRFS_FILE_EXTENT_REG || |
| 4153 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 4154 | em->start = extent_start; |
| 4155 | em->len = extent_end - extent_start; |
Yan Zheng | ff5b7ee | 2008-11-10 07:34:43 -0500 | [diff] [blame] | 4156 | em->orig_start = extent_start - |
| 4157 | btrfs_file_extent_offset(leaf, item); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 4158 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
| 4159 | if (bytenr == 0) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4160 | em->block_start = EXTENT_MAP_HOLE; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4161 | goto insert; |
| 4162 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4163 | if (compressed) { |
| 4164 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
| 4165 | em->block_start = bytenr; |
| 4166 | em->block_len = btrfs_file_extent_disk_num_bytes(leaf, |
| 4167 | item); |
| 4168 | } else { |
| 4169 | bytenr += btrfs_file_extent_offset(leaf, item); |
| 4170 | em->block_start = bytenr; |
| 4171 | em->block_len = em->len; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 4172 | if (found_type == BTRFS_FILE_EXTENT_PREALLOC) |
| 4173 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4174 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4175 | goto insert; |
| 4176 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4177 | unsigned long ptr; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4178 | char *map; |
Chris Mason | 3326d1b | 2007-10-15 16:18:25 -0400 | [diff] [blame] | 4179 | size_t size; |
| 4180 | size_t extent_offset; |
| 4181 | size_t copy_size; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4182 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4183 | em->block_start = EXTENT_MAP_INLINE; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4184 | if (!page || create) { |
Yan | 689f934 | 2007-10-29 11:41:07 -0400 | [diff] [blame] | 4185 | em->start = extent_start; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 4186 | em->len = extent_end - extent_start; |
Yan | 689f934 | 2007-10-29 11:41:07 -0400 | [diff] [blame] | 4187 | goto out; |
| 4188 | } |
| 4189 | |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 4190 | size = btrfs_file_extent_inline_len(leaf, item); |
| 4191 | extent_offset = page_offset(page) + pg_offset - extent_start; |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 4192 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, |
Yan | 689f934 | 2007-10-29 11:41:07 -0400 | [diff] [blame] | 4193 | size - extent_offset); |
Chris Mason | 3326d1b | 2007-10-15 16:18:25 -0400 | [diff] [blame] | 4194 | em->start = extent_start + extent_offset; |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 4195 | em->len = (copy_size + root->sectorsize - 1) & |
| 4196 | ~((u64)root->sectorsize - 1); |
Yan Zheng | ff5b7ee | 2008-11-10 07:34:43 -0500 | [diff] [blame] | 4197 | em->orig_start = EXTENT_MAP_INLINE; |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4198 | if (compressed) |
| 4199 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
Yan | 689f934 | 2007-10-29 11:41:07 -0400 | [diff] [blame] | 4200 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 4201 | if (create == 0 && !PageUptodate(page)) { |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4202 | if (btrfs_file_extent_compression(leaf, item) == |
| 4203 | BTRFS_COMPRESS_ZLIB) { |
| 4204 | ret = uncompress_inline(path, inode, page, |
| 4205 | pg_offset, |
| 4206 | extent_offset, item); |
| 4207 | BUG_ON(ret); |
| 4208 | } else { |
| 4209 | map = kmap(page); |
| 4210 | read_extent_buffer(leaf, map + pg_offset, ptr, |
| 4211 | copy_size); |
| 4212 | kunmap(page); |
| 4213 | } |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 4214 | flush_dcache_page(page); |
| 4215 | } else if (create && PageUptodate(page)) { |
| 4216 | if (!trans) { |
| 4217 | kunmap(page); |
| 4218 | free_extent_map(em); |
| 4219 | em = NULL; |
| 4220 | btrfs_release_path(root, path); |
Chris Mason | f929574 | 2008-07-17 12:54:14 -0400 | [diff] [blame] | 4221 | trans = btrfs_join_transaction(root, 1); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 4222 | goto again; |
| 4223 | } |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4224 | map = kmap(page); |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 4225 | write_extent_buffer(leaf, map + pg_offset, ptr, |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 4226 | copy_size); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4227 | kunmap(page); |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 4228 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4229 | } |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4230 | set_extent_uptodate(io_tree, em->start, |
| 4231 | extent_map_end(em) - 1, GFP_NOFS); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4232 | goto insert; |
| 4233 | } else { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4234 | printk(KERN_ERR "btrfs unknown found_type %d\n", found_type); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4235 | WARN_ON(1); |
| 4236 | } |
| 4237 | not_found: |
| 4238 | em->start = start; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4239 | em->len = len; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4240 | not_found_em: |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4241 | em->block_start = EXTENT_MAP_HOLE; |
Yan Zheng | 9036c10 | 2008-10-30 14:19:41 -0400 | [diff] [blame] | 4242 | set_bit(EXTENT_FLAG_VACANCY, &em->flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4243 | insert: |
| 4244 | btrfs_release_path(root, path); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4245 | if (em->start > start || extent_map_end(em) <= start) { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4246 | printk(KERN_ERR "Btrfs: bad extent! em: [%llu %llu] passed " |
| 4247 | "[%llu %llu]\n", (unsigned long long)em->start, |
| 4248 | (unsigned long long)em->len, |
| 4249 | (unsigned long long)start, |
| 4250 | (unsigned long long)len); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4251 | err = -EIO; |
| 4252 | goto out; |
| 4253 | } |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4254 | |
| 4255 | err = 0; |
| 4256 | spin_lock(&em_tree->lock); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4257 | ret = add_extent_mapping(em_tree, em); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 4258 | /* it is possible that someone inserted the extent into the tree |
| 4259 | * while we had the lock dropped. It is also possible that |
| 4260 | * an overlapping map exists in the tree |
| 4261 | */ |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4262 | if (ret == -EEXIST) { |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 4263 | struct extent_map *existing; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4264 | |
| 4265 | ret = 0; |
| 4266 | |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 4267 | existing = lookup_extent_mapping(em_tree, start, len); |
Chris Mason | e1c4b74 | 2008-04-22 13:26:46 -0400 | [diff] [blame] | 4268 | if (existing && (existing->start > start || |
| 4269 | existing->start + existing->len <= start)) { |
| 4270 | free_extent_map(existing); |
| 4271 | existing = NULL; |
| 4272 | } |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 4273 | if (!existing) { |
| 4274 | existing = lookup_extent_mapping(em_tree, em->start, |
| 4275 | em->len); |
| 4276 | if (existing) { |
| 4277 | err = merge_extent_mapping(em_tree, existing, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4278 | em, start, |
| 4279 | root->sectorsize); |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 4280 | free_extent_map(existing); |
| 4281 | if (err) { |
| 4282 | free_extent_map(em); |
| 4283 | em = NULL; |
| 4284 | } |
| 4285 | } else { |
| 4286 | err = -EIO; |
Chris Mason | 3b95151 | 2008-04-17 11:29:12 -0400 | [diff] [blame] | 4287 | free_extent_map(em); |
| 4288 | em = NULL; |
| 4289 | } |
| 4290 | } else { |
| 4291 | free_extent_map(em); |
| 4292 | em = existing; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4293 | err = 0; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4294 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4295 | } |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4296 | spin_unlock(&em_tree->lock); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4297 | out: |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 4298 | if (path) |
| 4299 | btrfs_free_path(path); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4300 | if (trans) { |
| 4301 | ret = btrfs_end_transaction(trans, root); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4302 | if (!err) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4303 | err = ret; |
| 4304 | } |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4305 | if (err) { |
| 4306 | free_extent_map(em); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4307 | return ERR_PTR(err); |
| 4308 | } |
| 4309 | return em; |
| 4310 | } |
| 4311 | |
Chris Mason | 1643298 | 2008-04-10 10:23:21 -0400 | [diff] [blame] | 4312 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, |
| 4313 | const struct iovec *iov, loff_t offset, |
| 4314 | unsigned long nr_segs) |
| 4315 | { |
Chris Mason | e1c4b74 | 2008-04-22 13:26:46 -0400 | [diff] [blame] | 4316 | return -EINVAL; |
Chris Mason | 1643298 | 2008-04-10 10:23:21 -0400 | [diff] [blame] | 4317 | } |
| 4318 | |
Yehuda Sadeh | 1506fcc | 2009-01-21 14:39:14 -0500 | [diff] [blame] | 4319 | static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| 4320 | __u64 start, __u64 len) |
| 4321 | { |
| 4322 | return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent); |
| 4323 | } |
| 4324 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4325 | int btrfs_readpage(struct file *file, struct page *page) |
| 4326 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4327 | struct extent_io_tree *tree; |
| 4328 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4329 | return extent_read_full_page(tree, page, btrfs_get_extent); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4330 | } |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4331 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4332 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
| 4333 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4334 | struct extent_io_tree *tree; |
Chris Mason | b888db2 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4335 | |
| 4336 | |
| 4337 | if (current->flags & PF_MEMALLOC) { |
| 4338 | redirty_page_for_writepage(wbc, page); |
| 4339 | unlock_page(page); |
| 4340 | return 0; |
| 4341 | } |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4342 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4343 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
| 4344 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4345 | |
Chris Mason | f421950 | 2008-07-22 11:18:09 -0400 | [diff] [blame] | 4346 | int btrfs_writepages(struct address_space *mapping, |
| 4347 | struct writeback_control *wbc) |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 4348 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4349 | struct extent_io_tree *tree; |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 4350 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4351 | tree = &BTRFS_I(mapping->host)->io_tree; |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 4352 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
| 4353 | } |
| 4354 | |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 4355 | static int |
| 4356 | btrfs_readpages(struct file *file, struct address_space *mapping, |
| 4357 | struct list_head *pages, unsigned nr_pages) |
| 4358 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4359 | struct extent_io_tree *tree; |
| 4360 | tree = &BTRFS_I(mapping->host)->io_tree; |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 4361 | return extent_readpages(tree, mapping, pages, nr_pages, |
| 4362 | btrfs_get_extent); |
| 4363 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4364 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4365 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4366 | struct extent_io_tree *tree; |
| 4367 | struct extent_map_tree *map; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4368 | int ret; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4369 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4370 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
| 4371 | map = &BTRFS_I(page->mapping->host)->extent_tree; |
Chris Mason | 70dec80 | 2008-01-29 09:59:12 -0500 | [diff] [blame] | 4372 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4373 | if (ret == 1) { |
| 4374 | ClearPagePrivate(page); |
| 4375 | set_page_private(page, 0); |
| 4376 | page_cache_release(page); |
| 4377 | } |
| 4378 | return ret; |
| 4379 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4380 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4381 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
| 4382 | { |
Chris Mason | 98509cf | 2008-09-11 15:51:43 -0400 | [diff] [blame] | 4383 | if (PageWriteback(page) || PageDirty(page)) |
| 4384 | return 0; |
Yan Zheng | b335b00 | 2009-02-12 10:06:04 -0500 | [diff] [blame] | 4385 | return __btrfs_releasepage(page, gfp_flags & GFP_NOFS); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4386 | } |
| 4387 | |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4388 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
| 4389 | { |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4390 | struct extent_io_tree *tree; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4391 | struct btrfs_ordered_extent *ordered; |
| 4392 | u64 page_start = page_offset(page); |
| 4393 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4394 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4395 | wait_on_page_writeback(page); |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4396 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4397 | if (offset) { |
| 4398 | btrfs_releasepage(page, GFP_NOFS); |
| 4399 | return; |
| 4400 | } |
| 4401 | |
| 4402 | lock_extent(tree, page_start, page_end, GFP_NOFS); |
| 4403 | ordered = btrfs_lookup_ordered_extent(page->mapping->host, |
| 4404 | page_offset(page)); |
| 4405 | if (ordered) { |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 4406 | /* |
| 4407 | * IO on this page will never be started, so we need |
| 4408 | * to account for any ordered extents now |
| 4409 | */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4410 | clear_extent_bit(tree, page_start, page_end, |
| 4411 | EXTENT_DIRTY | EXTENT_DELALLOC | |
| 4412 | EXTENT_LOCKED, 1, 0, GFP_NOFS); |
Chris Mason | 211f90e | 2008-07-18 11:56:15 -0400 | [diff] [blame] | 4413 | btrfs_finish_ordered_io(page->mapping->host, |
| 4414 | page_start, page_end); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4415 | btrfs_put_ordered_extent(ordered); |
| 4416 | lock_extent(tree, page_start, page_end, GFP_NOFS); |
| 4417 | } |
| 4418 | clear_extent_bit(tree, page_start, page_end, |
| 4419 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
| 4420 | EXTENT_ORDERED, |
| 4421 | 1, 1, GFP_NOFS); |
| 4422 | __btrfs_releasepage(page, GFP_NOFS); |
| 4423 | |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 4424 | ClearPageChecked(page); |
Chris Mason | 9ad6b7b | 2008-04-18 16:11:30 -0400 | [diff] [blame] | 4425 | if (PagePrivate(page)) { |
Chris Mason | 9ad6b7b | 2008-04-18 16:11:30 -0400 | [diff] [blame] | 4426 | ClearPagePrivate(page); |
| 4427 | set_page_private(page, 0); |
| 4428 | page_cache_release(page); |
| 4429 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4430 | } |
| 4431 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4432 | /* |
| 4433 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets |
| 4434 | * called from a page fault handler when a page is first dirtied. Hence we must |
| 4435 | * be careful to check for EOF conditions here. We set the page up correctly |
| 4436 | * for a written page which means we get ENOSPC checking when writing into |
| 4437 | * holes and correct delalloc and unwritten extent mapping on filesystems that |
| 4438 | * support these features. |
| 4439 | * |
| 4440 | * We are not allowed to take the i_mutex here so we have to play games to |
| 4441 | * protect against truncate races as the page could now be beyond EOF. Because |
| 4442 | * vmtruncate() writes the inode size before removing pages, once we have the |
| 4443 | * page lock we can determine safely if the page is beyond EOF. If it is not |
| 4444 | * beyond EOF, then the page is guaranteed safe against truncation until we |
| 4445 | * unlock the page. |
| 4446 | */ |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 4447 | 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] | 4448 | { |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 4449 | struct page *page = vmf->page; |
Chris Mason | 6da6aba | 2007-12-18 16:15:09 -0500 | [diff] [blame] | 4450 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4451 | struct btrfs_root *root = BTRFS_I(inode)->root; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4452 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 4453 | struct btrfs_ordered_extent *ordered; |
| 4454 | char *kaddr; |
| 4455 | unsigned long zero_start; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4456 | loff_t size; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4457 | int ret; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4458 | u64 page_start; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4459 | u64 page_end; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4460 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 4461 | ret = btrfs_check_data_free_space(root, inode, PAGE_CACHE_SIZE); |
Nick Piggin | 56a76f8 | 2009-03-31 15:23:23 -0700 | [diff] [blame] | 4462 | if (ret) { |
| 4463 | if (ret == -ENOMEM) |
| 4464 | ret = VM_FAULT_OOM; |
| 4465 | else /* -ENOSPC, -EIO, etc */ |
| 4466 | ret = VM_FAULT_SIGBUS; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4467 | goto out; |
Nick Piggin | 56a76f8 | 2009-03-31 15:23:23 -0700 | [diff] [blame] | 4468 | } |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4469 | |
Nick Piggin | 56a76f8 | 2009-03-31 15:23:23 -0700 | [diff] [blame] | 4470 | ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4471 | again: |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4472 | lock_page(page); |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4473 | size = i_size_read(inode); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4474 | page_start = page_offset(page); |
| 4475 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4476 | |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4477 | if ((page->mapping != inode->i_mapping) || |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4478 | (page_start >= size)) { |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 4479 | btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE); |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4480 | /* page got truncated out from underneath us */ |
| 4481 | goto out_unlock; |
| 4482 | } |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4483 | wait_on_page_writeback(page); |
| 4484 | |
| 4485 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
| 4486 | set_page_extent_mapped(page); |
| 4487 | |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 4488 | /* |
| 4489 | * we can't set the delalloc bits if there are pending ordered |
| 4490 | * extents. Drop our locks and wait for them to finish |
| 4491 | */ |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4492 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
| 4493 | if (ordered) { |
| 4494 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
| 4495 | unlock_page(page); |
Chris Mason | eb84ae0 | 2008-07-17 13:53:27 -0400 | [diff] [blame] | 4496 | btrfs_start_ordered_extent(inode, ordered, 1); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4497 | btrfs_put_ordered_extent(ordered); |
| 4498 | goto again; |
| 4499 | } |
| 4500 | |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 4501 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4502 | ret = 0; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4503 | |
| 4504 | /* page is wholly or partially inside EOF */ |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 4505 | if (page_start + PAGE_CACHE_SIZE > size) |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4506 | zero_start = size & ~PAGE_CACHE_MASK; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4507 | else |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4508 | zero_start = PAGE_CACHE_SIZE; |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4509 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4510 | if (zero_start != PAGE_CACHE_SIZE) { |
| 4511 | kaddr = kmap(page); |
| 4512 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
| 4513 | flush_dcache_page(page); |
| 4514 | kunmap(page); |
| 4515 | } |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 4516 | ClearPageChecked(page); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4517 | set_page_dirty(page); |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 4518 | |
| 4519 | BTRFS_I(inode)->last_trans = root->fs_info->generation + 1; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4520 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4521 | |
| 4522 | out_unlock: |
| 4523 | unlock_page(page); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4524 | out: |
Chris Mason | 9ebefb18 | 2007-06-15 13:50:00 -0400 | [diff] [blame] | 4525 | return ret; |
| 4526 | } |
| 4527 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4528 | static void btrfs_truncate(struct inode *inode) |
| 4529 | { |
| 4530 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4531 | int ret; |
| 4532 | struct btrfs_trans_handle *trans; |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 4533 | unsigned long nr; |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 4534 | u64 mask = root->sectorsize - 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4535 | |
| 4536 | if (!S_ISREG(inode->i_mode)) |
| 4537 | return; |
| 4538 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) |
| 4539 | return; |
| 4540 | |
| 4541 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
Chris Mason | 4a09675 | 2008-07-21 10:29:44 -0400 | [diff] [blame] | 4542 | btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4543 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4544 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 4545 | |
| 4546 | /* |
| 4547 | * setattr is responsible for setting the ordered_data_close flag, |
| 4548 | * but that is only tested during the last file release. That |
| 4549 | * could happen well after the next commit, leaving a great big |
| 4550 | * window where new writes may get lost if someone chooses to write |
| 4551 | * to this file after truncating to zero |
| 4552 | * |
| 4553 | * The inode doesn't have any dirty data here, and so if we commit |
| 4554 | * this is a noop. If someone immediately starts writing to the inode |
| 4555 | * it is very likely we'll catch some of their writes in this |
| 4556 | * transaction, and the commit will find this file on the ordered |
| 4557 | * data list with good things to send down. |
| 4558 | * |
| 4559 | * This is a best effort solution, there is still a window where |
| 4560 | * using truncate to replace the contents of the file will |
| 4561 | * end up with a zero length file after a crash. |
| 4562 | */ |
| 4563 | if (inode->i_size == 0 && BTRFS_I(inode)->ordered_data_close) |
| 4564 | btrfs_add_ordered_operation(trans, root, inode); |
| 4565 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4566 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 4567 | btrfs_i_size_write(inode, inode->i_size); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4568 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 4569 | ret = btrfs_orphan_add(trans, inode); |
| 4570 | if (ret) |
| 4571 | goto out; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4572 | /* FIXME, add redo link to tree so we don't leak on crash */ |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4573 | ret = btrfs_truncate_inode_items(trans, root, inode, inode->i_size, |
Chris Mason | 85e21ba | 2008-01-29 15:11:36 -0500 | [diff] [blame] | 4574 | BTRFS_EXTENT_DATA_KEY); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4575 | btrfs_update_inode(trans, root, inode); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4576 | |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 4577 | ret = btrfs_orphan_del(trans, inode); |
| 4578 | BUG_ON(ret); |
| 4579 | |
| 4580 | out: |
| 4581 | nr = trans->blocks_used; |
Chris Mason | 89ce8a6 | 2008-06-25 16:01:31 -0400 | [diff] [blame] | 4582 | ret = btrfs_end_transaction_throttle(trans, root); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4583 | BUG_ON(ret); |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 4584 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4585 | } |
| 4586 | |
Sven Wegener | 3b96362 | 2008-06-09 21:57:42 -0400 | [diff] [blame] | 4587 | /* |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4588 | * create a new subvolume directory/inode (helper for the ioctl). |
| 4589 | */ |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 4590 | int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, |
| 4591 | struct btrfs_root *new_root, struct dentry *dentry, |
| 4592 | u64 new_dirid, u64 alloc_hint) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4593 | { |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4594 | struct inode *inode; |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 4595 | int error; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4596 | u64 index = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4597 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4598 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, new_dirid, |
Yan Zheng | d2fb343 | 2008-12-11 16:30:39 -0500 | [diff] [blame] | 4599 | new_dirid, alloc_hint, S_IFDIR | 0700, &index); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 4600 | if (IS_ERR(inode)) |
Christoph Hellwig | f46b5a6 | 2008-06-11 21:53:53 -0400 | [diff] [blame] | 4601 | return PTR_ERR(inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4602 | inode->i_op = &btrfs_dir_inode_operations; |
| 4603 | inode->i_fop = &btrfs_dir_file_operations; |
| 4604 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4605 | inode->i_nlink = 1; |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 4606 | btrfs_i_size_write(inode, 0); |
Sven Wegener | 3b96362 | 2008-06-09 21:57:42 -0400 | [diff] [blame] | 4607 | |
Christoph Hellwig | cb8e709 | 2008-10-09 13:39:39 -0400 | [diff] [blame] | 4608 | error = btrfs_update_inode(trans, new_root, inode); |
| 4609 | if (error) |
| 4610 | return error; |
| 4611 | |
| 4612 | d_instantiate(dentry, inode); |
| 4613 | return 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4614 | } |
| 4615 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4616 | /* helper function for file defrag and space balancing. This |
| 4617 | * forces readahead on a given range of bytes in an inode |
| 4618 | */ |
Chris Mason | edbd8d4 | 2007-12-21 16:27:24 -0500 | [diff] [blame] | 4619 | unsigned long btrfs_force_ra(struct address_space *mapping, |
Chris Mason | 86479a0 | 2007-09-10 19:58:16 -0400 | [diff] [blame] | 4620 | struct file_ra_state *ra, struct file *file, |
| 4621 | pgoff_t offset, pgoff_t last_index) |
| 4622 | { |
Chris Mason | 8e7bf94 | 2008-04-28 09:02:36 -0400 | [diff] [blame] | 4623 | pgoff_t req_size = last_index - offset + 1; |
Chris Mason | 86479a0 | 2007-09-10 19:58:16 -0400 | [diff] [blame] | 4624 | |
Chris Mason | 86479a0 | 2007-09-10 19:58:16 -0400 | [diff] [blame] | 4625 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); |
| 4626 | return offset + req_size; |
Chris Mason | 86479a0 | 2007-09-10 19:58:16 -0400 | [diff] [blame] | 4627 | } |
| 4628 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4629 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
| 4630 | { |
| 4631 | struct btrfs_inode *ei; |
| 4632 | |
| 4633 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); |
| 4634 | if (!ei) |
| 4635 | return NULL; |
Josef Bacik | 15ee9bc | 2007-08-10 16:22:09 -0400 | [diff] [blame] | 4636 | ei->last_trans = 0; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4637 | ei->logged_trans = 0; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4638 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 4639 | INIT_LIST_HEAD(&ei->i_orphan); |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 4640 | INIT_LIST_HEAD(&ei->ordered_operations); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4641 | return &ei->vfs_inode; |
| 4642 | } |
| 4643 | |
| 4644 | void btrfs_destroy_inode(struct inode *inode) |
| 4645 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4646 | struct btrfs_ordered_extent *ordered; |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 4647 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 4648 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4649 | WARN_ON(!list_empty(&inode->i_dentry)); |
| 4650 | WARN_ON(inode->i_data.nrpages); |
| 4651 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 4652 | /* |
| 4653 | * Make sure we're properly removed from the ordered operation |
| 4654 | * lists. |
| 4655 | */ |
| 4656 | smp_mb(); |
| 4657 | if (!list_empty(&BTRFS_I(inode)->ordered_operations)) { |
| 4658 | spin_lock(&root->fs_info->ordered_extent_lock); |
| 4659 | list_del_init(&BTRFS_I(inode)->ordered_operations); |
| 4660 | spin_unlock(&root->fs_info->ordered_extent_lock); |
| 4661 | } |
| 4662 | |
| 4663 | spin_lock(&root->list_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 4664 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { |
| 4665 | printk(KERN_ERR "BTRFS: inode %lu: inode still on the orphan" |
| 4666 | " list\n", inode->i_ino); |
| 4667 | dump_stack(); |
| 4668 | } |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 4669 | spin_unlock(&root->list_lock); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 4670 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4671 | while (1) { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4672 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); |
| 4673 | if (!ordered) |
| 4674 | break; |
| 4675 | else { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4676 | printk(KERN_ERR "btrfs found ordered " |
| 4677 | "extent %llu %llu on inode cleanup\n", |
| 4678 | (unsigned long long)ordered->file_offset, |
| 4679 | (unsigned long long)ordered->len); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 4680 | btrfs_remove_ordered_extent(inode, ordered); |
| 4681 | btrfs_put_ordered_extent(ordered); |
| 4682 | btrfs_put_ordered_extent(ordered); |
| 4683 | } |
| 4684 | } |
Yan Zheng | 5d4f98a | 2009-06-10 10:45:14 -0400 | [diff] [blame] | 4685 | inode_tree_del(inode); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 4686 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4687 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
| 4688 | } |
| 4689 | |
Sven Wegener | 0ee0fda | 2008-07-30 16:54:26 -0400 | [diff] [blame] | 4690 | static void init_once(void *foo) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4691 | { |
| 4692 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; |
| 4693 | |
| 4694 | inode_init_once(&ei->vfs_inode); |
| 4695 | } |
| 4696 | |
| 4697 | void btrfs_destroy_cachep(void) |
| 4698 | { |
| 4699 | if (btrfs_inode_cachep) |
| 4700 | kmem_cache_destroy(btrfs_inode_cachep); |
| 4701 | if (btrfs_trans_handle_cachep) |
| 4702 | kmem_cache_destroy(btrfs_trans_handle_cachep); |
| 4703 | if (btrfs_transaction_cachep) |
| 4704 | kmem_cache_destroy(btrfs_transaction_cachep); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4705 | if (btrfs_path_cachep) |
| 4706 | kmem_cache_destroy(btrfs_path_cachep); |
| 4707 | } |
| 4708 | |
| 4709 | int btrfs_init_cachep(void) |
| 4710 | { |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 4711 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode_cache", |
| 4712 | sizeof(struct btrfs_inode), 0, |
| 4713 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, init_once); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4714 | if (!btrfs_inode_cachep) |
| 4715 | goto fail; |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 4716 | |
| 4717 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle_cache", |
| 4718 | sizeof(struct btrfs_trans_handle), 0, |
| 4719 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4720 | if (!btrfs_trans_handle_cachep) |
| 4721 | goto fail; |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 4722 | |
| 4723 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction_cache", |
| 4724 | sizeof(struct btrfs_transaction), 0, |
| 4725 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4726 | if (!btrfs_transaction_cachep) |
| 4727 | goto fail; |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 4728 | |
| 4729 | btrfs_path_cachep = kmem_cache_create("btrfs_path_cache", |
| 4730 | sizeof(struct btrfs_path), 0, |
| 4731 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4732 | if (!btrfs_path_cachep) |
| 4733 | goto fail; |
Christoph Hellwig | 9601e3f | 2009-04-13 15:33:09 +0200 | [diff] [blame] | 4734 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4735 | return 0; |
| 4736 | fail: |
| 4737 | btrfs_destroy_cachep(); |
| 4738 | return -ENOMEM; |
| 4739 | } |
| 4740 | |
| 4741 | static int btrfs_getattr(struct vfsmount *mnt, |
| 4742 | struct dentry *dentry, struct kstat *stat) |
| 4743 | { |
| 4744 | struct inode *inode = dentry->d_inode; |
| 4745 | generic_fillattr(inode, stat); |
Chris Mason | 3394e16 | 2008-11-17 20:42:26 -0500 | [diff] [blame] | 4746 | stat->dev = BTRFS_I(inode)->root->anon_super.s_dev; |
Chris Mason | d666746 | 2008-01-03 14:51:00 -0500 | [diff] [blame] | 4747 | stat->blksize = PAGE_CACHE_SIZE; |
Yan Zheng | a76a3cd | 2008-10-09 11:46:29 -0400 | [diff] [blame] | 4748 | stat->blocks = (inode_get_bytes(inode) + |
| 4749 | BTRFS_I(inode)->delalloc_bytes) >> 9; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4750 | return 0; |
| 4751 | } |
| 4752 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4753 | static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 4754 | struct inode *new_dir, struct dentry *new_dentry) |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4755 | { |
| 4756 | struct btrfs_trans_handle *trans; |
| 4757 | struct btrfs_root *root = BTRFS_I(old_dir)->root; |
| 4758 | struct inode *new_inode = new_dentry->d_inode; |
| 4759 | struct inode *old_inode = old_dentry->d_inode; |
| 4760 | struct timespec ctime = CURRENT_TIME; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4761 | u64 index = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4762 | int ret; |
| 4763 | |
Chris Mason | 3394e16 | 2008-11-17 20:42:26 -0500 | [diff] [blame] | 4764 | /* we're not allowed to rename between subvolumes */ |
| 4765 | if (BTRFS_I(old_inode)->root->root_key.objectid != |
| 4766 | BTRFS_I(new_dir)->root->root_key.objectid) |
| 4767 | return -EXDEV; |
| 4768 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4769 | if (S_ISDIR(old_inode->i_mode) && new_inode && |
| 4770 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { |
| 4771 | return -ENOTEMPTY; |
| 4772 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4773 | |
Chris Mason | 0660b5a | 2008-11-17 20:37:39 -0500 | [diff] [blame] | 4774 | /* to rename a snapshot or subvolume, we need to juggle the |
| 4775 | * backrefs. This isn't coded yet |
| 4776 | */ |
| 4777 | if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID) |
| 4778 | return -EXDEV; |
| 4779 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 4780 | ret = btrfs_check_metadata_free_space(root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4781 | if (ret) |
| 4782 | goto out_unlock; |
| 4783 | |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 4784 | /* |
| 4785 | * we're using rename to replace one file with another. |
| 4786 | * and the replacement file is large. Start IO on it now so |
| 4787 | * we don't add too much work to the end of the transaction |
| 4788 | */ |
| 4789 | if (new_inode && old_inode && S_ISREG(old_inode->i_mode) && |
| 4790 | new_inode->i_size && |
| 4791 | old_inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT) |
| 4792 | filemap_flush(old_inode->i_mapping); |
| 4793 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4794 | trans = btrfs_start_transaction(root, 1); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4795 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4796 | /* |
Chris Mason | 5a3f23d | 2009-03-31 13:27:11 -0400 | [diff] [blame] | 4797 | * make sure the inode gets flushed if it is replacing |
| 4798 | * something. |
| 4799 | */ |
| 4800 | if (new_inode && new_inode->i_size && |
| 4801 | old_inode && S_ISREG(old_inode->i_mode)) { |
| 4802 | btrfs_add_ordered_operation(trans, root, old_inode); |
| 4803 | } |
| 4804 | |
| 4805 | /* |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4806 | * this is an ugly little race, but the rename is required to make |
| 4807 | * sure that if we crash, the inode is either at the old name |
| 4808 | * or the new one. pinning the log transaction lets us make sure |
| 4809 | * we don't allow a log commit to come in after we unlink the |
| 4810 | * name but before we add the new name back in. |
| 4811 | */ |
| 4812 | btrfs_pin_log_trans(root); |
| 4813 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4814 | btrfs_set_trans_block_group(trans, new_dir); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4815 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4816 | btrfs_inc_nlink(old_dentry->d_inode); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4817 | old_dir->i_ctime = old_dir->i_mtime = ctime; |
| 4818 | new_dir->i_ctime = new_dir->i_mtime = ctime; |
| 4819 | old_inode->i_ctime = ctime; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4820 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4821 | if (old_dentry->d_parent != new_dentry->d_parent) |
| 4822 | btrfs_record_unlink_dir(trans, old_dir, old_inode, 1); |
| 4823 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4824 | ret = btrfs_unlink_inode(trans, root, old_dir, old_dentry->d_inode, |
| 4825 | old_dentry->d_name.name, |
| 4826 | old_dentry->d_name.len); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4827 | if (ret) |
| 4828 | goto out_fail; |
| 4829 | |
| 4830 | if (new_inode) { |
| 4831 | new_inode->i_ctime = CURRENT_TIME; |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4832 | ret = btrfs_unlink_inode(trans, root, new_dir, |
| 4833 | new_dentry->d_inode, |
| 4834 | new_dentry->d_name.name, |
| 4835 | new_dentry->d_name.len); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4836 | if (ret) |
| 4837 | goto out_fail; |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 4838 | if (new_inode->i_nlink == 0) { |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4839 | ret = btrfs_orphan_add(trans, new_dentry->d_inode); |
Josef Bacik | 7b12876 | 2008-07-24 12:17:14 -0400 | [diff] [blame] | 4840 | if (ret) |
| 4841 | goto out_fail; |
| 4842 | } |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4843 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4844 | } |
Chris Mason | 3de4586 | 2008-11-17 21:02:50 -0500 | [diff] [blame] | 4845 | ret = btrfs_set_inode_index(new_dir, &index); |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4846 | if (ret) |
| 4847 | goto out_fail; |
| 4848 | |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 4849 | ret = btrfs_add_link(trans, new_dentry->d_parent->d_inode, |
| 4850 | old_inode, new_dentry->d_name.name, |
| 4851 | new_dentry->d_name.len, 1, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4852 | if (ret) |
| 4853 | goto out_fail; |
| 4854 | |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4855 | btrfs_log_new_name(trans, old_inode, old_dir, |
| 4856 | new_dentry->d_parent); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4857 | out_fail: |
Chris Mason | 12fcfd2 | 2009-03-24 10:24:20 -0400 | [diff] [blame] | 4858 | |
| 4859 | /* this btrfs_end_log_trans just allows the current |
| 4860 | * log-sub transaction to complete |
| 4861 | */ |
| 4862 | btrfs_end_log_trans(root); |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 4863 | btrfs_end_transaction_throttle(trans, root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4864 | out_unlock: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4865 | return ret; |
| 4866 | } |
| 4867 | |
Chris Mason | d352ac6 | 2008-09-29 15:18:18 -0400 | [diff] [blame] | 4868 | /* |
| 4869 | * some fairly slow code that needs optimization. This walks the list |
| 4870 | * of all the inodes with pending delalloc and forces them to disk. |
| 4871 | */ |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 4872 | int btrfs_start_delalloc_inodes(struct btrfs_root *root) |
| 4873 | { |
| 4874 | struct list_head *head = &root->fs_info->delalloc_inodes; |
| 4875 | struct btrfs_inode *binode; |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 4876 | struct inode *inode; |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 4877 | |
Yan Zheng | c146afa | 2008-11-12 14:34:12 -0500 | [diff] [blame] | 4878 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
| 4879 | return -EROFS; |
| 4880 | |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 4881 | spin_lock(&root->fs_info->delalloc_lock); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4882 | while (!list_empty(head)) { |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 4883 | binode = list_entry(head->next, struct btrfs_inode, |
| 4884 | delalloc_inodes); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 4885 | inode = igrab(&binode->vfs_inode); |
| 4886 | if (!inode) |
| 4887 | list_del_init(&binode->delalloc_inodes); |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 4888 | spin_unlock(&root->fs_info->delalloc_lock); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 4889 | if (inode) { |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 4890 | filemap_flush(inode->i_mapping); |
Zheng Yan | 5b21f2e | 2008-09-26 10:05:38 -0400 | [diff] [blame] | 4891 | iput(inode); |
| 4892 | } |
| 4893 | cond_resched(); |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 4894 | spin_lock(&root->fs_info->delalloc_lock); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 4895 | } |
Chris Mason | 75eff68 | 2008-12-15 15:54:40 -0500 | [diff] [blame] | 4896 | spin_unlock(&root->fs_info->delalloc_lock); |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 4897 | |
| 4898 | /* the filemap_flush will queue IO into the worker threads, but |
| 4899 | * we have to make sure the IO is actually started and that |
| 4900 | * ordered extents get created before we return |
| 4901 | */ |
| 4902 | atomic_inc(&root->fs_info->async_submit_draining); |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 4903 | while (atomic_read(&root->fs_info->nr_async_submits) || |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 4904 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 4905 | wait_event(root->fs_info->async_submit_wait, |
Chris Mason | 771ed68 | 2008-11-06 22:02:51 -0500 | [diff] [blame] | 4906 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
| 4907 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); |
Chris Mason | 8c8bee1 | 2008-09-29 11:19:10 -0400 | [diff] [blame] | 4908 | } |
| 4909 | atomic_dec(&root->fs_info->async_submit_draining); |
Chris Mason | ea8c281 | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 4910 | return 0; |
| 4911 | } |
| 4912 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4913 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
| 4914 | const char *symname) |
| 4915 | { |
| 4916 | struct btrfs_trans_handle *trans; |
| 4917 | struct btrfs_root *root = BTRFS_I(dir)->root; |
| 4918 | struct btrfs_path *path; |
| 4919 | struct btrfs_key key; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4920 | struct inode *inode = NULL; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4921 | int err; |
| 4922 | int drop_inode = 0; |
| 4923 | u64 objectid; |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4924 | u64 index = 0 ; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4925 | int name_len; |
| 4926 | int datasize; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4927 | unsigned long ptr; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4928 | struct btrfs_file_extent_item *ei; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4929 | struct extent_buffer *leaf; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4930 | unsigned long nr = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4931 | |
| 4932 | name_len = strlen(symname) + 1; |
| 4933 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) |
| 4934 | return -ENAMETOOLONG; |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4935 | |
Josef Bacik | 6a63209 | 2009-02-20 11:00:09 -0500 | [diff] [blame] | 4936 | err = btrfs_check_metadata_free_space(root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 4937 | if (err) |
| 4938 | goto out_fail; |
| 4939 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4940 | trans = btrfs_start_transaction(root, 1); |
| 4941 | btrfs_set_trans_block_group(trans, dir); |
| 4942 | |
| 4943 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); |
| 4944 | if (err) { |
| 4945 | err = -ENOSPC; |
| 4946 | goto out_unlock; |
| 4947 | } |
| 4948 | |
Josef Bacik | aec7477 | 2008-07-24 12:12:38 -0400 | [diff] [blame] | 4949 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
Chris Mason | 9c58309 | 2008-01-29 15:15:18 -0500 | [diff] [blame] | 4950 | dentry->d_name.len, |
| 4951 | dentry->d_parent->d_inode->i_ino, objectid, |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4952 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO, |
| 4953 | &index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4954 | err = PTR_ERR(inode); |
| 4955 | if (IS_ERR(inode)) |
| 4956 | goto out_unlock; |
| 4957 | |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 4958 | err = btrfs_init_inode_security(inode, dir); |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 4959 | if (err) { |
| 4960 | drop_inode = 1; |
| 4961 | goto out_unlock; |
| 4962 | } |
| 4963 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4964 | btrfs_set_trans_block_group(trans, inode); |
Chris Mason | 00e4e6b | 2008-08-05 11:18:09 -0400 | [diff] [blame] | 4965 | err = btrfs_add_nondir(trans, dentry, inode, 0, index); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4966 | if (err) |
| 4967 | drop_inode = 1; |
| 4968 | else { |
| 4969 | inode->i_mapping->a_ops = &btrfs_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 4970 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4971 | inode->i_fop = &btrfs_file_operations; |
| 4972 | inode->i_op = &btrfs_file_inode_operations; |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 4973 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4974 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4975 | btrfs_update_inode_block_group(trans, inode); |
| 4976 | btrfs_update_inode_block_group(trans, dir); |
| 4977 | if (drop_inode) |
| 4978 | goto out_unlock; |
| 4979 | |
| 4980 | path = btrfs_alloc_path(); |
| 4981 | BUG_ON(!path); |
| 4982 | key.objectid = inode->i_ino; |
| 4983 | key.offset = 0; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4984 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
| 4985 | datasize = btrfs_file_extent_calc_inline_size(name_len); |
| 4986 | err = btrfs_insert_empty_item(trans, root, path, &key, |
| 4987 | datasize); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 4988 | if (err) { |
| 4989 | drop_inode = 1; |
| 4990 | goto out_unlock; |
| 4991 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 4992 | leaf = path->nodes[0]; |
| 4993 | ei = btrfs_item_ptr(leaf, path->slots[0], |
| 4994 | struct btrfs_file_extent_item); |
| 4995 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); |
| 4996 | btrfs_set_file_extent_type(leaf, ei, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 4997 | BTRFS_FILE_EXTENT_INLINE); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 4998 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
| 4999 | btrfs_set_file_extent_compression(leaf, ei, 0); |
| 5000 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); |
| 5001 | btrfs_set_file_extent_ram_bytes(leaf, ei, name_len); |
| 5002 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5003 | ptr = btrfs_file_extent_inline_start(ei); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5004 | write_extent_buffer(leaf, symname, ptr, name_len); |
| 5005 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5006 | btrfs_free_path(path); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 5007 | |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5008 | inode->i_op = &btrfs_symlink_inode_operations; |
| 5009 | inode->i_mapping->a_ops = &btrfs_symlink_aops; |
Chris Mason | 0416008 | 2008-03-26 10:28:07 -0400 | [diff] [blame] | 5010 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5011 | inode_set_bytes(inode, name_len); |
Chris Mason | dbe674a | 2008-07-17 12:54:05 -0400 | [diff] [blame] | 5012 | btrfs_i_size_write(inode, name_len - 1); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 5013 | err = btrfs_update_inode(trans, root, inode); |
| 5014 | if (err) |
| 5015 | drop_inode = 1; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5016 | |
| 5017 | out_unlock: |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 5018 | nr = trans->blocks_used; |
Chris Mason | ab78c84 | 2008-07-29 16:15:18 -0400 | [diff] [blame] | 5019 | btrfs_end_transaction_throttle(trans, root); |
Chris Mason | 1832a6d | 2007-12-21 16:27:21 -0500 | [diff] [blame] | 5020 | out_fail: |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5021 | if (drop_inode) { |
| 5022 | inode_dec_link_count(inode); |
| 5023 | iput(inode); |
| 5024 | } |
Chris Mason | d3c2fdc | 2007-09-17 10:58:06 -0400 | [diff] [blame] | 5025 | btrfs_btree_balance_dirty(root, nr); |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5026 | return err; |
| 5027 | } |
Chris Mason | 1643298 | 2008-04-10 10:23:21 -0400 | [diff] [blame] | 5028 | |
Chris Mason | 546888d | 2009-04-21 11:53:38 -0400 | [diff] [blame] | 5029 | static int prealloc_file_range(struct btrfs_trans_handle *trans, |
| 5030 | struct inode *inode, u64 start, u64 end, |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 5031 | u64 locked_end, u64 alloc_hint, int mode) |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5032 | { |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5033 | struct btrfs_root *root = BTRFS_I(inode)->root; |
| 5034 | struct btrfs_key ins; |
| 5035 | u64 alloc_size; |
| 5036 | u64 cur_offset = start; |
| 5037 | u64 num_bytes = end - start; |
| 5038 | int ret = 0; |
| 5039 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5040 | while (num_bytes > 0) { |
| 5041 | alloc_size = min(num_bytes, root->fs_info->max_extent); |
| 5042 | ret = btrfs_reserve_extent(trans, root, alloc_size, |
| 5043 | root->sectorsize, 0, alloc_hint, |
| 5044 | (u64)-1, &ins, 1); |
| 5045 | if (ret) { |
| 5046 | WARN_ON(1); |
| 5047 | goto out; |
| 5048 | } |
| 5049 | ret = insert_reserved_file_extent(trans, inode, |
| 5050 | cur_offset, ins.objectid, |
| 5051 | ins.offset, ins.offset, |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 5052 | ins.offset, locked_end, |
| 5053 | 0, 0, 0, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5054 | BTRFS_FILE_EXTENT_PREALLOC); |
| 5055 | BUG_ON(ret); |
| 5056 | num_bytes -= ins.offset; |
| 5057 | cur_offset += ins.offset; |
| 5058 | alloc_hint = ins.objectid + ins.offset; |
| 5059 | } |
| 5060 | out: |
| 5061 | if (cur_offset > start) { |
| 5062 | inode->i_ctime = CURRENT_TIME; |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 5063 | BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5064 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
| 5065 | cur_offset > i_size_read(inode)) |
| 5066 | btrfs_i_size_write(inode, cur_offset); |
| 5067 | ret = btrfs_update_inode(trans, root, inode); |
| 5068 | BUG_ON(ret); |
| 5069 | } |
| 5070 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5071 | return ret; |
| 5072 | } |
| 5073 | |
| 5074 | static long btrfs_fallocate(struct inode *inode, int mode, |
| 5075 | loff_t offset, loff_t len) |
| 5076 | { |
| 5077 | u64 cur_offset; |
| 5078 | u64 last_byte; |
| 5079 | u64 alloc_start; |
| 5080 | u64 alloc_end; |
| 5081 | u64 alloc_hint = 0; |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 5082 | u64 locked_end; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5083 | u64 mask = BTRFS_I(inode)->root->sectorsize - 1; |
| 5084 | struct extent_map *em; |
Chris Mason | 546888d | 2009-04-21 11:53:38 -0400 | [diff] [blame] | 5085 | struct btrfs_trans_handle *trans; |
Josef Bacik | a970b0a | 2009-06-27 21:07:34 -0400 | [diff] [blame] | 5086 | struct btrfs_root *root; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5087 | int ret; |
| 5088 | |
| 5089 | alloc_start = offset & ~mask; |
| 5090 | alloc_end = (offset + len + mask) & ~mask; |
| 5091 | |
Chris Mason | 546888d | 2009-04-21 11:53:38 -0400 | [diff] [blame] | 5092 | /* |
| 5093 | * wait for ordered IO before we have any locks. We'll loop again |
| 5094 | * below with the locks held. |
| 5095 | */ |
| 5096 | btrfs_wait_ordered_range(inode, alloc_start, alloc_end - alloc_start); |
| 5097 | |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5098 | mutex_lock(&inode->i_mutex); |
| 5099 | if (alloc_start > inode->i_size) { |
| 5100 | ret = btrfs_cont_expand(inode, alloc_start); |
| 5101 | if (ret) |
| 5102 | goto out; |
| 5103 | } |
| 5104 | |
Josef Bacik | a970b0a | 2009-06-27 21:07:34 -0400 | [diff] [blame] | 5105 | root = BTRFS_I(inode)->root; |
| 5106 | |
| 5107 | ret = btrfs_check_data_free_space(root, inode, |
| 5108 | alloc_end - alloc_start); |
| 5109 | if (ret) |
| 5110 | goto out; |
| 5111 | |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 5112 | locked_end = alloc_end - 1; |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5113 | while (1) { |
| 5114 | struct btrfs_ordered_extent *ordered; |
Chris Mason | 546888d | 2009-04-21 11:53:38 -0400 | [diff] [blame] | 5115 | |
| 5116 | trans = btrfs_start_transaction(BTRFS_I(inode)->root, 1); |
| 5117 | if (!trans) { |
| 5118 | ret = -EIO; |
Josef Bacik | a970b0a | 2009-06-27 21:07:34 -0400 | [diff] [blame] | 5119 | goto out_free; |
Chris Mason | 546888d | 2009-04-21 11:53:38 -0400 | [diff] [blame] | 5120 | } |
| 5121 | |
| 5122 | /* the extent lock is ordered inside the running |
| 5123 | * transaction |
| 5124 | */ |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 5125 | lock_extent(&BTRFS_I(inode)->io_tree, alloc_start, locked_end, |
| 5126 | GFP_NOFS); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5127 | ordered = btrfs_lookup_first_ordered_extent(inode, |
| 5128 | alloc_end - 1); |
| 5129 | if (ordered && |
| 5130 | ordered->file_offset + ordered->len > alloc_start && |
| 5131 | ordered->file_offset < alloc_end) { |
| 5132 | btrfs_put_ordered_extent(ordered); |
| 5133 | unlock_extent(&BTRFS_I(inode)->io_tree, |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 5134 | alloc_start, locked_end, GFP_NOFS); |
Chris Mason | 546888d | 2009-04-21 11:53:38 -0400 | [diff] [blame] | 5135 | btrfs_end_transaction(trans, BTRFS_I(inode)->root); |
| 5136 | |
| 5137 | /* |
| 5138 | * we can't wait on the range with the transaction |
| 5139 | * running or with the extent lock held |
| 5140 | */ |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5141 | btrfs_wait_ordered_range(inode, alloc_start, |
| 5142 | alloc_end - alloc_start); |
| 5143 | } else { |
| 5144 | if (ordered) |
| 5145 | btrfs_put_ordered_extent(ordered); |
| 5146 | break; |
| 5147 | } |
| 5148 | } |
| 5149 | |
| 5150 | cur_offset = alloc_start; |
| 5151 | while (1) { |
| 5152 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, |
| 5153 | alloc_end - cur_offset, 0); |
| 5154 | BUG_ON(IS_ERR(em) || !em); |
| 5155 | last_byte = min(extent_map_end(em), alloc_end); |
| 5156 | last_byte = (last_byte + mask) & ~mask; |
| 5157 | if (em->block_start == EXTENT_MAP_HOLE) { |
Chris Mason | 546888d | 2009-04-21 11:53:38 -0400 | [diff] [blame] | 5158 | ret = prealloc_file_range(trans, inode, cur_offset, |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 5159 | last_byte, locked_end + 1, |
| 5160 | alloc_hint, mode); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5161 | if (ret < 0) { |
| 5162 | free_extent_map(em); |
| 5163 | break; |
| 5164 | } |
| 5165 | } |
| 5166 | if (em->block_start <= EXTENT_MAP_LAST_BYTE) |
| 5167 | alloc_hint = em->block_start; |
| 5168 | free_extent_map(em); |
| 5169 | |
| 5170 | cur_offset = last_byte; |
| 5171 | if (cur_offset >= alloc_end) { |
| 5172 | ret = 0; |
| 5173 | break; |
| 5174 | } |
| 5175 | } |
Chris Mason | e980b50 | 2009-04-24 14:39:24 -0400 | [diff] [blame] | 5176 | unlock_extent(&BTRFS_I(inode)->io_tree, alloc_start, locked_end, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5177 | GFP_NOFS); |
Chris Mason | 546888d | 2009-04-21 11:53:38 -0400 | [diff] [blame] | 5178 | |
| 5179 | btrfs_end_transaction(trans, BTRFS_I(inode)->root); |
Josef Bacik | a970b0a | 2009-06-27 21:07:34 -0400 | [diff] [blame] | 5180 | out_free: |
| 5181 | btrfs_free_reserved_data_space(root, inode, alloc_end - alloc_start); |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5182 | out: |
| 5183 | mutex_unlock(&inode->i_mutex); |
| 5184 | return ret; |
| 5185 | } |
| 5186 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5187 | static int btrfs_set_page_dirty(struct page *page) |
| 5188 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5189 | return __set_page_dirty_nobuffers(page); |
| 5190 | } |
| 5191 | |
Sven Wegener | 0ee0fda | 2008-07-30 16:54:26 -0400 | [diff] [blame] | 5192 | static int btrfs_permission(struct inode *inode, int mask) |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 5193 | { |
Christoph Hellwig | 6cbff00 | 2009-04-17 10:37:41 +0200 | [diff] [blame] | 5194 | if ((BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) && (mask & MAY_WRITE)) |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 5195 | return -EACCES; |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 5196 | return generic_permission(inode, mask, btrfs_check_acl); |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 5197 | } |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5198 | |
| 5199 | static struct inode_operations btrfs_dir_inode_operations = { |
Chris Mason | 3394e16 | 2008-11-17 20:42:26 -0500 | [diff] [blame] | 5200 | .getattr = btrfs_getattr, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5201 | .lookup = btrfs_lookup, |
| 5202 | .create = btrfs_create, |
| 5203 | .unlink = btrfs_unlink, |
| 5204 | .link = btrfs_link, |
| 5205 | .mkdir = btrfs_mkdir, |
| 5206 | .rmdir = btrfs_rmdir, |
| 5207 | .rename = btrfs_rename, |
| 5208 | .symlink = btrfs_symlink, |
| 5209 | .setattr = btrfs_setattr, |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 5210 | .mknod = btrfs_mknod, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 5211 | .setxattr = btrfs_setxattr, |
| 5212 | .getxattr = btrfs_getxattr, |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 5213 | .listxattr = btrfs_listxattr, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 5214 | .removexattr = btrfs_removexattr, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 5215 | .permission = btrfs_permission, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5216 | }; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5217 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
| 5218 | .lookup = btrfs_lookup, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 5219 | .permission = btrfs_permission, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5220 | }; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5221 | static struct file_operations btrfs_dir_file_operations = { |
| 5222 | .llseek = generic_file_llseek, |
| 5223 | .read = generic_read_dir, |
David Woodhouse | cbdf5a2 | 2008-08-06 19:42:33 +0100 | [diff] [blame] | 5224 | .readdir = btrfs_real_readdir, |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 5225 | .unlocked_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5226 | #ifdef CONFIG_COMPAT |
Christoph Hellwig | 34287aa | 2007-09-14 10:22:47 -0400 | [diff] [blame] | 5227 | .compat_ioctl = btrfs_ioctl, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5228 | #endif |
Sage Weil | 6bf13c0 | 2008-06-10 10:07:39 -0400 | [diff] [blame] | 5229 | .release = btrfs_release_file, |
Chris Mason | e02119d | 2008-09-05 16:13:11 -0400 | [diff] [blame] | 5230 | .fsync = btrfs_sync_file, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5231 | }; |
| 5232 | |
Chris Mason | d1310b2 | 2008-01-24 16:13:08 -0500 | [diff] [blame] | 5233 | static struct extent_io_ops btrfs_extent_io_ops = { |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 5234 | .fill_delalloc = run_delalloc_range, |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 5235 | .submit_bio_hook = btrfs_submit_bio_hook, |
Chris Mason | 239b14b | 2008-03-24 15:02:07 -0400 | [diff] [blame] | 5236 | .merge_bio_hook = btrfs_merge_bio_hook, |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 5237 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5238 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
Chris Mason | 247e743 | 2008-07-17 12:53:51 -0400 | [diff] [blame] | 5239 | .writepage_start_hook = btrfs_writepage_start_hook, |
Chris Mason | 1259ab7 | 2008-05-12 13:39:03 -0400 | [diff] [blame] | 5240 | .readpage_io_failed_hook = btrfs_io_failed_hook, |
Chris Mason | b0c68f8 | 2008-01-31 11:05:37 -0500 | [diff] [blame] | 5241 | .set_bit_hook = btrfs_set_bit_hook, |
| 5242 | .clear_bit_hook = btrfs_clear_bit_hook, |
Chris Mason | 07157aa | 2007-08-30 08:50:51 -0400 | [diff] [blame] | 5243 | }; |
| 5244 | |
Chris Mason | 3505439 | 2009-01-21 13:11:13 -0500 | [diff] [blame] | 5245 | /* |
| 5246 | * btrfs doesn't support the bmap operation because swapfiles |
| 5247 | * use bmap to make a mapping of extents in the file. They assume |
| 5248 | * these extents won't change over the life of the file and they |
| 5249 | * use the bmap result to do IO directly to the drive. |
| 5250 | * |
| 5251 | * the btrfs bmap call would return logical addresses that aren't |
| 5252 | * suitable for IO and they also will change frequently as COW |
| 5253 | * operations happen. So, swapfile + btrfs == corruption. |
| 5254 | * |
| 5255 | * For now we're avoiding this by dropping bmap. |
| 5256 | */ |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5257 | static struct address_space_operations btrfs_aops = { |
| 5258 | .readpage = btrfs_readpage, |
| 5259 | .writepage = btrfs_writepage, |
Chris Mason | b293f02 | 2007-11-01 19:45:34 -0400 | [diff] [blame] | 5260 | .writepages = btrfs_writepages, |
Chris Mason | 3ab2fb5 | 2007-11-08 10:59:22 -0500 | [diff] [blame] | 5261 | .readpages = btrfs_readpages, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5262 | .sync_page = block_sync_page, |
Chris Mason | 1643298 | 2008-04-10 10:23:21 -0400 | [diff] [blame] | 5263 | .direct_IO = btrfs_direct_IO, |
Chris Mason | a52d9a8 | 2007-08-27 16:49:44 -0400 | [diff] [blame] | 5264 | .invalidatepage = btrfs_invalidatepage, |
| 5265 | .releasepage = btrfs_releasepage, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 5266 | .set_page_dirty = btrfs_set_page_dirty, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5267 | }; |
| 5268 | |
| 5269 | static struct address_space_operations btrfs_symlink_aops = { |
| 5270 | .readpage = btrfs_readpage, |
| 5271 | .writepage = btrfs_writepage, |
Chris Mason | 2bf5a72 | 2007-08-30 11:54:02 -0400 | [diff] [blame] | 5272 | .invalidatepage = btrfs_invalidatepage, |
| 5273 | .releasepage = btrfs_releasepage, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5274 | }; |
| 5275 | |
| 5276 | static struct inode_operations btrfs_file_inode_operations = { |
| 5277 | .truncate = btrfs_truncate, |
| 5278 | .getattr = btrfs_getattr, |
| 5279 | .setattr = btrfs_setattr, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 5280 | .setxattr = btrfs_setxattr, |
| 5281 | .getxattr = btrfs_getxattr, |
Josef Bacik | 5103e94 | 2007-11-16 11:45:54 -0500 | [diff] [blame] | 5282 | .listxattr = btrfs_listxattr, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 5283 | .removexattr = btrfs_removexattr, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 5284 | .permission = btrfs_permission, |
Yan Zheng | d899e05 | 2008-10-30 14:25:28 -0400 | [diff] [blame] | 5285 | .fallocate = btrfs_fallocate, |
Yehuda Sadeh | 1506fcc | 2009-01-21 14:39:14 -0500 | [diff] [blame] | 5286 | .fiemap = btrfs_fiemap, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5287 | }; |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 5288 | static struct inode_operations btrfs_special_inode_operations = { |
| 5289 | .getattr = btrfs_getattr, |
| 5290 | .setattr = btrfs_setattr, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 5291 | .permission = btrfs_permission, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 5292 | .setxattr = btrfs_setxattr, |
| 5293 | .getxattr = btrfs_getxattr, |
Josef Bacik | 33268ea | 2008-07-24 12:16:36 -0400 | [diff] [blame] | 5294 | .listxattr = btrfs_listxattr, |
Christoph Hellwig | 95819c0 | 2008-08-28 06:21:17 -0400 | [diff] [blame] | 5295 | .removexattr = btrfs_removexattr, |
Josef Bacik | 618e21d | 2007-07-11 10:18:17 -0400 | [diff] [blame] | 5296 | }; |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5297 | static struct inode_operations btrfs_symlink_inode_operations = { |
| 5298 | .readlink = generic_readlink, |
| 5299 | .follow_link = page_follow_link_light, |
| 5300 | .put_link = page_put_link, |
Yan | fdebe2b | 2008-01-14 13:26:08 -0500 | [diff] [blame] | 5301 | .permission = btrfs_permission, |
Jim Owens | 0279b4c | 2009-02-04 09:29:13 -0500 | [diff] [blame] | 5302 | .setxattr = btrfs_setxattr, |
| 5303 | .getxattr = btrfs_getxattr, |
| 5304 | .listxattr = btrfs_listxattr, |
| 5305 | .removexattr = btrfs_removexattr, |
Chris Mason | 39279cc | 2007-06-12 06:35:45 -0400 | [diff] [blame] | 5306 | }; |