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6cbd5570 CM |
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 | ||
39279cc3 CM |
19 | #include <linux/buffer_head.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/time.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/smp_lock.h> | |
27 | #include <linux/backing-dev.h> | |
28 | #include <linux/mpage.h> | |
29 | #include <linux/swap.h> | |
30 | #include <linux/writeback.h> | |
31 | #include <linux/statfs.h> | |
32 | #include <linux/compat.h> | |
9ebefb18 | 33 | #include <linux/bit_spinlock.h> |
92fee66d | 34 | #include <linux/version.h> |
39279cc3 CM |
35 | #include "ctree.h" |
36 | #include "disk-io.h" | |
37 | #include "transaction.h" | |
38 | #include "btrfs_inode.h" | |
39 | #include "ioctl.h" | |
40 | #include "print-tree.h" | |
41 | ||
42 | struct btrfs_iget_args { | |
43 | u64 ino; | |
44 | struct btrfs_root *root; | |
45 | }; | |
46 | ||
47 | static struct inode_operations btrfs_dir_inode_operations; | |
48 | static struct inode_operations btrfs_symlink_inode_operations; | |
49 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 50 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
51 | static struct inode_operations btrfs_file_inode_operations; |
52 | static struct address_space_operations btrfs_aops; | |
53 | static struct address_space_operations btrfs_symlink_aops; | |
54 | static struct file_operations btrfs_dir_file_operations; | |
07157aac | 55 | static struct extent_map_ops btrfs_extent_map_ops; |
39279cc3 CM |
56 | |
57 | static struct kmem_cache *btrfs_inode_cachep; | |
58 | struct kmem_cache *btrfs_trans_handle_cachep; | |
59 | struct kmem_cache *btrfs_transaction_cachep; | |
60 | struct kmem_cache *btrfs_bit_radix_cachep; | |
61 | struct kmem_cache *btrfs_path_cachep; | |
62 | ||
63 | #define S_SHIFT 12 | |
64 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
65 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
66 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
67 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
68 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
69 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
70 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
71 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
72 | }; | |
73 | ||
b888db2b CM |
74 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) |
75 | { | |
76 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
77 | struct btrfs_trans_handle *trans; | |
78 | struct btrfs_key ins; | |
79 | u64 alloc_hint = 0; | |
db94535d | 80 | u64 num_bytes; |
b888db2b | 81 | int ret; |
db94535d | 82 | u64 blocksize = root->sectorsize; |
b888db2b CM |
83 | |
84 | mutex_lock(&root->fs_info->fs_mutex); | |
85 | trans = btrfs_start_transaction(root, 1); | |
86 | btrfs_set_trans_block_group(trans, inode); | |
87 | BUG_ON(!trans); | |
db94535d | 88 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
b888db2b | 89 | ret = btrfs_drop_extents(trans, root, inode, |
db94535d CM |
90 | start, start + num_bytes, &alloc_hint); |
91 | ||
92 | ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_bytes, 0, | |
b888db2b CM |
93 | alloc_hint, (u64)-1, &ins, 1); |
94 | if (ret) { | |
95 | WARN_ON(1); | |
96 | goto out; | |
97 | } | |
98 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
99 | start, ins.objectid, ins.offset, | |
100 | ins.offset); | |
101 | out: | |
102 | btrfs_end_transaction(trans, root); | |
103 | mutex_unlock(&root->fs_info->fs_mutex); | |
104 | return ret; | |
105 | } | |
106 | ||
07157aac CM |
107 | int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end) |
108 | { | |
109 | struct inode *inode = page->mapping->host; | |
110 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
111 | struct btrfs_trans_handle *trans; | |
112 | char *kaddr; | |
113 | int ret; | |
114 | u64 page_start = page->index << PAGE_CACHE_SHIFT; | |
115 | size_t offset = start - page_start; | |
116 | ||
117 | mutex_lock(&root->fs_info->fs_mutex); | |
118 | trans = btrfs_start_transaction(root, 1); | |
119 | btrfs_set_trans_block_group(trans, inode); | |
120 | kaddr = kmap(page); | |
121 | btrfs_csum_file_block(trans, root, inode->i_ino, | |
122 | start, kaddr + offset, end - start + 1); | |
123 | kunmap(page); | |
124 | ret = btrfs_end_transaction(trans, root); | |
125 | BUG_ON(ret); | |
126 | mutex_unlock(&root->fs_info->fs_mutex); | |
127 | return ret; | |
128 | } | |
129 | ||
130 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |
131 | { | |
132 | int ret = 0; | |
133 | struct inode *inode = page->mapping->host; | |
134 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
135 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
136 | struct btrfs_csum_item *item; | |
137 | struct btrfs_path *path = NULL; | |
138 | u64 private; | |
139 | ||
140 | mutex_lock(&root->fs_info->fs_mutex); | |
141 | path = btrfs_alloc_path(); | |
142 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
143 | if (IS_ERR(item)) { | |
144 | ret = PTR_ERR(item); | |
145 | /* a csum that isn't present is a preallocated region. */ | |
146 | if (ret == -ENOENT || ret == -EFBIG) | |
147 | ret = 0; | |
148 | private = 0; | |
149 | goto out; | |
150 | } | |
151 | memcpy((char *)&private, &item->csum, BTRFS_CRC32_SIZE); | |
152 | set_state_private(em_tree, start, private); | |
153 | out: | |
154 | if (path) | |
155 | btrfs_free_path(path); | |
156 | mutex_unlock(&root->fs_info->fs_mutex); | |
157 | return ret; | |
158 | } | |
159 | ||
160 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) | |
161 | { | |
07157aac CM |
162 | size_t offset = start - (page->index << PAGE_CACHE_SHIFT); |
163 | struct inode *inode = page->mapping->host; | |
07157aac CM |
164 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
165 | char *kaddr; | |
166 | u64 private; | |
167 | int ret; | |
168 | ||
169 | ret = get_state_private(em_tree, start, &private); | |
170 | kaddr = kmap_atomic(page, KM_IRQ0); | |
171 | if (ret) { | |
172 | goto zeroit; | |
173 | } | |
5f39d397 CM |
174 | /* |
175 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
176 | char csum[BTRFS_CRC32_SIZE]; | |
07157aac CM |
177 | ret = btrfs_csum_data(root, kaddr + offset, end - start + 1, csum); |
178 | BUG_ON(ret); | |
179 | if (memcmp(csum, &private, BTRFS_CRC32_SIZE)) { | |
180 | goto zeroit; | |
181 | } | |
5f39d397 | 182 | */ |
07157aac CM |
183 | kunmap_atomic(kaddr, KM_IRQ0); |
184 | return 0; | |
185 | ||
186 | zeroit: | |
187 | printk("btrfs csum failed ino %lu off %llu\n", | |
188 | page->mapping->host->i_ino, (unsigned long long)start); | |
db94535d CM |
189 | memset(kaddr + offset, 1, end - start + 1); |
190 | flush_dcache_page(page); | |
07157aac CM |
191 | kunmap_atomic(kaddr, KM_IRQ0); |
192 | return 0; | |
193 | } | |
b888db2b | 194 | |
39279cc3 CM |
195 | void btrfs_read_locked_inode(struct inode *inode) |
196 | { | |
197 | struct btrfs_path *path; | |
5f39d397 | 198 | struct extent_buffer *leaf; |
39279cc3 | 199 | struct btrfs_inode_item *inode_item; |
5f39d397 | 200 | struct btrfs_inode_timespec *tspec; |
39279cc3 CM |
201 | struct btrfs_root *root = BTRFS_I(inode)->root; |
202 | struct btrfs_key location; | |
203 | u64 alloc_group_block; | |
618e21d5 | 204 | u32 rdev; |
39279cc3 CM |
205 | int ret; |
206 | ||
207 | path = btrfs_alloc_path(); | |
208 | BUG_ON(!path); | |
39279cc3 CM |
209 | mutex_lock(&root->fs_info->fs_mutex); |
210 | ||
211 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); | |
212 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
5f39d397 | 213 | if (ret) |
39279cc3 | 214 | goto make_bad; |
39279cc3 | 215 | |
5f39d397 CM |
216 | leaf = path->nodes[0]; |
217 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
218 | struct btrfs_inode_item); | |
219 | ||
220 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
221 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
222 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
223 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
224 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
225 | ||
226 | tspec = btrfs_inode_atime(inode_item); | |
227 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
228 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
229 | ||
230 | tspec = btrfs_inode_mtime(inode_item); | |
231 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
232 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
233 | ||
234 | tspec = btrfs_inode_ctime(inode_item); | |
235 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
236 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
237 | ||
238 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
239 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 240 | inode->i_rdev = 0; |
5f39d397 CM |
241 | rdev = btrfs_inode_rdev(leaf, inode_item); |
242 | ||
243 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
244 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
245 | alloc_group_block); | |
246 | ||
247 | btrfs_free_path(path); | |
248 | inode_item = NULL; | |
249 | ||
250 | mutex_unlock(&root->fs_info->fs_mutex); | |
251 | ||
252 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
253 | case S_IFREG: |
254 | inode->i_mapping->a_ops = &btrfs_aops; | |
07157aac | 255 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
256 | inode->i_fop = &btrfs_file_operations; |
257 | inode->i_op = &btrfs_file_inode_operations; | |
258 | break; | |
259 | case S_IFDIR: | |
260 | inode->i_fop = &btrfs_dir_file_operations; | |
261 | if (root == root->fs_info->tree_root) | |
262 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
263 | else | |
264 | inode->i_op = &btrfs_dir_inode_operations; | |
265 | break; | |
266 | case S_IFLNK: | |
267 | inode->i_op = &btrfs_symlink_inode_operations; | |
268 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
269 | break; | |
618e21d5 JB |
270 | default: |
271 | init_special_inode(inode, inode->i_mode, rdev); | |
272 | break; | |
39279cc3 CM |
273 | } |
274 | return; | |
275 | ||
276 | make_bad: | |
277 | btrfs_release_path(root, path); | |
278 | btrfs_free_path(path); | |
279 | mutex_unlock(&root->fs_info->fs_mutex); | |
280 | make_bad_inode(inode); | |
281 | } | |
282 | ||
5f39d397 CM |
283 | static void fill_inode_item(struct extent_buffer *leaf, |
284 | struct btrfs_inode_item *item, | |
39279cc3 CM |
285 | struct inode *inode) |
286 | { | |
5f39d397 CM |
287 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
288 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
289 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
290 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
291 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
292 | ||
293 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
294 | inode->i_atime.tv_sec); | |
295 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
296 | inode->i_atime.tv_nsec); | |
297 | ||
298 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
299 | inode->i_mtime.tv_sec); | |
300 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
301 | inode->i_mtime.tv_nsec); | |
302 | ||
303 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
304 | inode->i_ctime.tv_sec); | |
305 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
306 | inode->i_ctime.tv_nsec); | |
307 | ||
308 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
309 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
310 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
311 | btrfs_set_inode_block_group(leaf, item, | |
39279cc3 CM |
312 | BTRFS_I(inode)->block_group->key.objectid); |
313 | } | |
314 | ||
a52d9a80 | 315 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
316 | struct btrfs_root *root, |
317 | struct inode *inode) | |
318 | { | |
319 | struct btrfs_inode_item *inode_item; | |
320 | struct btrfs_path *path; | |
5f39d397 | 321 | struct extent_buffer *leaf; |
39279cc3 CM |
322 | int ret; |
323 | ||
324 | path = btrfs_alloc_path(); | |
325 | BUG_ON(!path); | |
39279cc3 CM |
326 | ret = btrfs_lookup_inode(trans, root, path, |
327 | &BTRFS_I(inode)->location, 1); | |
328 | if (ret) { | |
329 | if (ret > 0) | |
330 | ret = -ENOENT; | |
331 | goto failed; | |
332 | } | |
333 | ||
5f39d397 CM |
334 | leaf = path->nodes[0]; |
335 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
336 | struct btrfs_inode_item); |
337 | ||
5f39d397 CM |
338 | fill_inode_item(leaf, inode_item, inode); |
339 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 340 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
341 | ret = 0; |
342 | failed: | |
343 | btrfs_release_path(root, path); | |
344 | btrfs_free_path(path); | |
345 | return ret; | |
346 | } | |
347 | ||
348 | ||
349 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
350 | struct btrfs_root *root, | |
351 | struct inode *dir, | |
352 | struct dentry *dentry) | |
353 | { | |
354 | struct btrfs_path *path; | |
355 | const char *name = dentry->d_name.name; | |
356 | int name_len = dentry->d_name.len; | |
357 | int ret = 0; | |
5f39d397 | 358 | struct extent_buffer *leaf; |
39279cc3 | 359 | struct btrfs_dir_item *di; |
5f39d397 | 360 | struct btrfs_key key; |
39279cc3 CM |
361 | |
362 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
363 | if (!path) { |
364 | ret = -ENOMEM; | |
365 | goto err; | |
366 | } | |
367 | ||
39279cc3 CM |
368 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
369 | name, name_len, -1); | |
370 | if (IS_ERR(di)) { | |
371 | ret = PTR_ERR(di); | |
372 | goto err; | |
373 | } | |
374 | if (!di) { | |
375 | ret = -ENOENT; | |
376 | goto err; | |
377 | } | |
5f39d397 CM |
378 | leaf = path->nodes[0]; |
379 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 380 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
381 | if (ret) |
382 | goto err; | |
39279cc3 CM |
383 | btrfs_release_path(root, path); |
384 | ||
385 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 386 | key.objectid, name, name_len, -1); |
39279cc3 CM |
387 | if (IS_ERR(di)) { |
388 | ret = PTR_ERR(di); | |
389 | goto err; | |
390 | } | |
391 | if (!di) { | |
392 | ret = -ENOENT; | |
393 | goto err; | |
394 | } | |
395 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
396 | |
397 | dentry->d_inode->i_ctime = dir->i_ctime; | |
398 | err: | |
399 | btrfs_free_path(path); | |
400 | if (!ret) { | |
401 | dir->i_size -= name_len * 2; | |
79c44584 | 402 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 CM |
403 | btrfs_update_inode(trans, root, dir); |
404 | drop_nlink(dentry->d_inode); | |
54aa1f4d | 405 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
406 | dir->i_sb->s_dirt = 1; |
407 | } | |
408 | return ret; | |
409 | } | |
410 | ||
411 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
412 | { | |
413 | struct btrfs_root *root; | |
414 | struct btrfs_trans_handle *trans; | |
415 | int ret; | |
d3c2fdcf | 416 | unsigned long nr; |
39279cc3 CM |
417 | |
418 | root = BTRFS_I(dir)->root; | |
419 | mutex_lock(&root->fs_info->fs_mutex); | |
420 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 421 | |
39279cc3 CM |
422 | btrfs_set_trans_block_group(trans, dir); |
423 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 424 | nr = trans->blocks_used; |
5f39d397 | 425 | |
39279cc3 CM |
426 | btrfs_end_transaction(trans, root); |
427 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 428 | btrfs_btree_balance_dirty(root, nr); |
5f39d397 | 429 | |
39279cc3 CM |
430 | return ret; |
431 | } | |
432 | ||
433 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
434 | { | |
435 | struct inode *inode = dentry->d_inode; | |
436 | int err; | |
437 | int ret; | |
438 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
439 | struct btrfs_path *path; | |
440 | struct btrfs_key key; | |
441 | struct btrfs_trans_handle *trans; | |
442 | struct btrfs_key found_key; | |
443 | int found_type; | |
5f39d397 | 444 | struct extent_buffer *leaf; |
39279cc3 | 445 | char *goodnames = ".."; |
d3c2fdcf | 446 | unsigned long nr; |
39279cc3 CM |
447 | |
448 | path = btrfs_alloc_path(); | |
449 | BUG_ON(!path); | |
39279cc3 CM |
450 | mutex_lock(&root->fs_info->fs_mutex); |
451 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 452 | |
39279cc3 CM |
453 | btrfs_set_trans_block_group(trans, dir); |
454 | key.objectid = inode->i_ino; | |
455 | key.offset = (u64)-1; | |
5f39d397 | 456 | key.type = (u8)-1; |
39279cc3 CM |
457 | while(1) { |
458 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
459 | if (ret < 0) { | |
460 | err = ret; | |
461 | goto out; | |
462 | } | |
463 | BUG_ON(ret == 0); | |
464 | if (path->slots[0] == 0) { | |
465 | err = -ENOENT; | |
466 | goto out; | |
467 | } | |
468 | path->slots[0]--; | |
5f39d397 CM |
469 | leaf = path->nodes[0]; |
470 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
39279cc3 CM |
471 | found_type = btrfs_key_type(&found_key); |
472 | if (found_key.objectid != inode->i_ino) { | |
473 | err = -ENOENT; | |
474 | goto out; | |
475 | } | |
476 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
477 | found_type != BTRFS_DIR_INDEX_KEY) || | |
478 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
479 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
480 | err = -ENOTEMPTY; | |
481 | goto out; | |
482 | } | |
483 | ret = btrfs_del_item(trans, root, path); | |
484 | BUG_ON(ret); | |
485 | ||
486 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) | |
487 | break; | |
488 | btrfs_release_path(root, path); | |
489 | } | |
490 | ret = 0; | |
491 | btrfs_release_path(root, path); | |
492 | ||
493 | /* now the directory is empty */ | |
494 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
495 | if (!err) { | |
496 | inode->i_size = 0; | |
497 | } | |
498 | out: | |
499 | btrfs_release_path(root, path); | |
500 | btrfs_free_path(path); | |
501 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 502 | nr = trans->blocks_used; |
39279cc3 | 503 | ret = btrfs_end_transaction(trans, root); |
d3c2fdcf | 504 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
505 | if (ret && !err) |
506 | err = ret; | |
507 | return err; | |
508 | } | |
509 | ||
510 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
511 | struct btrfs_root *root, | |
512 | struct inode *inode) | |
513 | { | |
514 | struct btrfs_path *path; | |
515 | int ret; | |
516 | ||
517 | clear_inode(inode); | |
518 | ||
519 | path = btrfs_alloc_path(); | |
520 | BUG_ON(!path); | |
39279cc3 CM |
521 | ret = btrfs_lookup_inode(trans, root, path, |
522 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
523 | if (ret > 0) |
524 | ret = -ENOENT; | |
525 | if (!ret) | |
526 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
527 | btrfs_free_path(path); |
528 | return ret; | |
529 | } | |
530 | ||
39279cc3 CM |
531 | /* |
532 | * this can truncate away extent items, csum items and directory items. | |
533 | * It starts at a high offset and removes keys until it can't find | |
534 | * any higher than i_size. | |
535 | * | |
536 | * csum items that cross the new i_size are truncated to the new size | |
537 | * as well. | |
538 | */ | |
539 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
540 | struct btrfs_root *root, | |
541 | struct inode *inode) | |
542 | { | |
543 | int ret; | |
544 | struct btrfs_path *path; | |
545 | struct btrfs_key key; | |
5f39d397 | 546 | struct btrfs_key found_key; |
39279cc3 | 547 | u32 found_type; |
5f39d397 | 548 | struct extent_buffer *leaf; |
39279cc3 CM |
549 | struct btrfs_file_extent_item *fi; |
550 | u64 extent_start = 0; | |
db94535d | 551 | u64 extent_num_bytes = 0; |
39279cc3 CM |
552 | u64 item_end = 0; |
553 | int found_extent; | |
554 | int del_item; | |
555 | ||
a52d9a80 | 556 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 557 | path = btrfs_alloc_path(); |
3c69faec | 558 | path->reada = -1; |
39279cc3 | 559 | BUG_ON(!path); |
5f39d397 | 560 | |
39279cc3 CM |
561 | /* FIXME, add redo link to tree so we don't leak on crash */ |
562 | key.objectid = inode->i_ino; | |
563 | key.offset = (u64)-1; | |
5f39d397 CM |
564 | key.type = (u8)-1; |
565 | ||
39279cc3 CM |
566 | while(1) { |
567 | btrfs_init_path(path); | |
568 | fi = NULL; | |
569 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
570 | if (ret < 0) { | |
571 | goto error; | |
572 | } | |
573 | if (ret > 0) { | |
574 | BUG_ON(path->slots[0] == 0); | |
575 | path->slots[0]--; | |
576 | } | |
5f39d397 CM |
577 | leaf = path->nodes[0]; |
578 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
579 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 580 | |
5f39d397 | 581 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 582 | break; |
5f39d397 | 583 | |
39279cc3 CM |
584 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
585 | found_type != BTRFS_DIR_ITEM_KEY && | |
586 | found_type != BTRFS_DIR_INDEX_KEY && | |
587 | found_type != BTRFS_EXTENT_DATA_KEY) | |
588 | break; | |
589 | ||
5f39d397 | 590 | item_end = found_key.offset; |
39279cc3 | 591 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 592 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 593 | struct btrfs_file_extent_item); |
5f39d397 | 594 | if (btrfs_file_extent_type(leaf, fi) != |
39279cc3 | 595 | BTRFS_FILE_EXTENT_INLINE) { |
5f39d397 | 596 | item_end += |
db94535d | 597 | btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
598 | } |
599 | } | |
600 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
601 | ret = btrfs_csum_truncate(trans, root, path, | |
602 | inode->i_size); | |
603 | BUG_ON(ret); | |
604 | } | |
605 | if (item_end < inode->i_size) { | |
b888db2b CM |
606 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
607 | found_type = BTRFS_INODE_ITEM_KEY; | |
608 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
609 | found_type = BTRFS_CSUM_ITEM_KEY; | |
610 | } else if (found_type) { | |
611 | found_type--; | |
612 | } else { | |
613 | break; | |
39279cc3 | 614 | } |
a61721d5 | 615 | btrfs_set_key_type(&key, found_type); |
b888db2b | 616 | continue; |
39279cc3 | 617 | } |
5f39d397 | 618 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
619 | del_item = 1; |
620 | else | |
621 | del_item = 0; | |
622 | found_extent = 0; | |
623 | ||
624 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
625 | if (found_type == BTRFS_EXTENT_DATA_KEY && | |
5f39d397 | 626 | btrfs_file_extent_type(leaf, fi) != |
39279cc3 CM |
627 | BTRFS_FILE_EXTENT_INLINE) { |
628 | u64 num_dec; | |
db94535d | 629 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 630 | if (!del_item) { |
db94535d CM |
631 | u64 orig_num_bytes = |
632 | btrfs_file_extent_num_bytes(leaf, fi); | |
633 | extent_num_bytes = inode->i_size - | |
5f39d397 | 634 | found_key.offset + root->sectorsize - 1; |
db94535d CM |
635 | btrfs_set_file_extent_num_bytes(leaf, fi, |
636 | extent_num_bytes); | |
637 | num_dec = (orig_num_bytes - | |
638 | extent_num_bytes) >> 9; | |
bab9fb03 Y |
639 | if (extent_start != 0) { |
640 | inode->i_blocks -= num_dec; | |
641 | } | |
5f39d397 | 642 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 643 | } else { |
db94535d CM |
644 | extent_num_bytes = |
645 | btrfs_file_extent_disk_num_bytes(leaf, | |
646 | fi); | |
39279cc3 | 647 | /* FIXME blocksize != 4096 */ |
db94535d CM |
648 | num_dec = btrfs_file_extent_num_bytes(leaf, |
649 | fi) >> 9; | |
39279cc3 CM |
650 | if (extent_start != 0) { |
651 | found_extent = 1; | |
652 | inode->i_blocks -= num_dec; | |
653 | } | |
654 | } | |
655 | } | |
656 | if (del_item) { | |
657 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
658 | if (ret) |
659 | goto error; | |
39279cc3 CM |
660 | } else { |
661 | break; | |
662 | } | |
663 | btrfs_release_path(root, path); | |
664 | if (found_extent) { | |
665 | ret = btrfs_free_extent(trans, root, extent_start, | |
db94535d | 666 | extent_num_bytes, 0); |
39279cc3 CM |
667 | BUG_ON(ret); |
668 | } | |
669 | } | |
670 | ret = 0; | |
671 | error: | |
672 | btrfs_release_path(root, path); | |
673 | btrfs_free_path(path); | |
674 | inode->i_sb->s_dirt = 1; | |
675 | return ret; | |
676 | } | |
677 | ||
b888db2b | 678 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
679 | size_t zero_start) |
680 | { | |
681 | char *kaddr; | |
682 | int ret = 0; | |
b888db2b | 683 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
a52d9a80 | 684 | u64 page_start = page->index << PAGE_CACHE_SHIFT; |
b888db2b | 685 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
a52d9a80 | 686 | |
b3cfa35a | 687 | set_page_extent_mapped(page); |
a52d9a80 | 688 | |
b888db2b CM |
689 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
690 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, | |
691 | page_end, GFP_NOFS); | |
a52d9a80 | 692 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 693 | kaddr = kmap(page); |
a52d9a80 CM |
694 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
695 | flush_dcache_page(page); | |
b888db2b | 696 | kunmap(page); |
a52d9a80 | 697 | } |
b888db2b CM |
698 | set_page_dirty(page); |
699 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 700 | |
a52d9a80 CM |
701 | return ret; |
702 | } | |
703 | ||
39279cc3 CM |
704 | /* |
705 | * taken from block_truncate_page, but does cow as it zeros out | |
706 | * any bytes left in the last page in the file. | |
707 | */ | |
708 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
709 | { | |
710 | struct inode *inode = mapping->host; | |
db94535d CM |
711 | struct btrfs_root *root = BTRFS_I(inode)->root; |
712 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
713 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
714 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
715 | struct page *page; | |
39279cc3 | 716 | int ret = 0; |
a52d9a80 | 717 | u64 page_start; |
39279cc3 CM |
718 | |
719 | if ((offset & (blocksize - 1)) == 0) | |
720 | goto out; | |
721 | ||
db94535d | 722 | down_read(&root->snap_sem); |
39279cc3 CM |
723 | ret = -ENOMEM; |
724 | page = grab_cache_page(mapping, index); | |
725 | if (!page) | |
726 | goto out; | |
39279cc3 | 727 | if (!PageUptodate(page)) { |
9ebefb18 | 728 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
729 | lock_page(page); |
730 | if (!PageUptodate(page)) { | |
731 | ret = -EIO; | |
732 | goto out; | |
733 | } | |
734 | } | |
a52d9a80 CM |
735 | page_start = page->index << PAGE_CACHE_SHIFT; |
736 | ||
b888db2b | 737 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 738 | |
39279cc3 CM |
739 | unlock_page(page); |
740 | page_cache_release(page); | |
011410bd | 741 | up_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
742 | out: |
743 | return ret; | |
744 | } | |
745 | ||
746 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
747 | { | |
748 | struct inode *inode = dentry->d_inode; | |
749 | int err; | |
750 | ||
751 | err = inode_change_ok(inode, attr); | |
752 | if (err) | |
753 | return err; | |
754 | ||
755 | if (S_ISREG(inode->i_mode) && | |
756 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
757 | struct btrfs_trans_handle *trans; | |
758 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2bf5a725 CM |
759 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
760 | ||
5f39d397 | 761 | u64 mask = root->sectorsize - 1; |
39279cc3 | 762 | u64 pos = (inode->i_size + mask) & ~mask; |
2bf5a725 | 763 | u64 block_end = attr->ia_size | mask; |
39279cc3 | 764 | u64 hole_size; |
2bf5a725 | 765 | u64 alloc_hint; |
39279cc3 CM |
766 | |
767 | if (attr->ia_size <= pos) | |
768 | goto out; | |
769 | ||
770 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
771 | ||
2bf5a725 | 772 | lock_extent(em_tree, pos, block_end, GFP_NOFS); |
39279cc3 | 773 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
39279cc3 CM |
774 | |
775 | mutex_lock(&root->fs_info->fs_mutex); | |
776 | trans = btrfs_start_transaction(root, 1); | |
777 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 CM |
778 | err = btrfs_drop_extents(trans, root, inode, |
779 | pos, pos + hole_size, &alloc_hint); | |
780 | ||
39279cc3 CM |
781 | err = btrfs_insert_file_extent(trans, root, inode->i_ino, |
782 | pos, 0, 0, hole_size); | |
39279cc3 CM |
783 | btrfs_end_transaction(trans, root); |
784 | mutex_unlock(&root->fs_info->fs_mutex); | |
2bf5a725 | 785 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
786 | if (err) |
787 | return err; | |
39279cc3 CM |
788 | } |
789 | out: | |
790 | err = inode_setattr(inode, attr); | |
791 | ||
792 | return err; | |
793 | } | |
794 | void btrfs_delete_inode(struct inode *inode) | |
795 | { | |
796 | struct btrfs_trans_handle *trans; | |
797 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 798 | unsigned long nr; |
39279cc3 CM |
799 | int ret; |
800 | ||
801 | truncate_inode_pages(&inode->i_data, 0); | |
802 | if (is_bad_inode(inode)) { | |
803 | goto no_delete; | |
804 | } | |
5f39d397 | 805 | |
39279cc3 CM |
806 | inode->i_size = 0; |
807 | mutex_lock(&root->fs_info->fs_mutex); | |
808 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 809 | |
39279cc3 CM |
810 | btrfs_set_trans_block_group(trans, inode); |
811 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
54aa1f4d CM |
812 | if (ret) |
813 | goto no_delete_lock; | |
814 | ret = btrfs_free_inode(trans, root, inode); | |
815 | if (ret) | |
816 | goto no_delete_lock; | |
d3c2fdcf | 817 | nr = trans->blocks_used; |
5f39d397 | 818 | |
39279cc3 CM |
819 | btrfs_end_transaction(trans, root); |
820 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 821 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 822 | return; |
54aa1f4d CM |
823 | |
824 | no_delete_lock: | |
d3c2fdcf | 825 | nr = trans->blocks_used; |
54aa1f4d CM |
826 | btrfs_end_transaction(trans, root); |
827 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 828 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
829 | no_delete: |
830 | clear_inode(inode); | |
831 | } | |
832 | ||
833 | /* | |
834 | * this returns the key found in the dir entry in the location pointer. | |
835 | * If no dir entries were found, location->objectid is 0. | |
836 | */ | |
837 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
838 | struct btrfs_key *location) | |
839 | { | |
840 | const char *name = dentry->d_name.name; | |
841 | int namelen = dentry->d_name.len; | |
842 | struct btrfs_dir_item *di; | |
843 | struct btrfs_path *path; | |
844 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
845 | int ret; | |
846 | ||
847 | path = btrfs_alloc_path(); | |
848 | BUG_ON(!path); | |
39279cc3 CM |
849 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
850 | namelen, 0); | |
851 | if (!di || IS_ERR(di)) { | |
852 | location->objectid = 0; | |
853 | ret = 0; | |
854 | goto out; | |
855 | } | |
5f39d397 | 856 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 CM |
857 | out: |
858 | btrfs_release_path(root, path); | |
859 | btrfs_free_path(path); | |
860 | return ret; | |
861 | } | |
862 | ||
863 | /* | |
864 | * when we hit a tree root in a directory, the btrfs part of the inode | |
865 | * needs to be changed to reflect the root directory of the tree root. This | |
866 | * is kind of like crossing a mount point. | |
867 | */ | |
868 | static int fixup_tree_root_location(struct btrfs_root *root, | |
869 | struct btrfs_key *location, | |
58176a96 JB |
870 | struct btrfs_root **sub_root, |
871 | struct dentry *dentry) | |
39279cc3 CM |
872 | { |
873 | struct btrfs_path *path; | |
874 | struct btrfs_root_item *ri; | |
875 | ||
876 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
877 | return 0; | |
878 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
879 | return 0; | |
880 | ||
881 | path = btrfs_alloc_path(); | |
882 | BUG_ON(!path); | |
883 | mutex_lock(&root->fs_info->fs_mutex); | |
884 | ||
58176a96 JB |
885 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
886 | dentry->d_name.name, | |
887 | dentry->d_name.len); | |
39279cc3 CM |
888 | if (IS_ERR(*sub_root)) |
889 | return PTR_ERR(*sub_root); | |
890 | ||
891 | ri = &(*sub_root)->root_item; | |
892 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
893 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
894 | location->offset = 0; | |
895 | ||
896 | btrfs_free_path(path); | |
897 | mutex_unlock(&root->fs_info->fs_mutex); | |
898 | return 0; | |
899 | } | |
900 | ||
901 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
902 | { | |
903 | struct btrfs_iget_args *args = p; | |
904 | inode->i_ino = args->ino; | |
905 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
906 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
907 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
908 | return 0; |
909 | } | |
910 | ||
911 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
912 | { | |
913 | struct btrfs_iget_args *args = opaque; | |
914 | return (args->ino == inode->i_ino && | |
915 | args->root == BTRFS_I(inode)->root); | |
916 | } | |
917 | ||
918 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
919 | struct btrfs_root *root) | |
920 | { | |
921 | struct inode *inode; | |
922 | struct btrfs_iget_args args; | |
923 | args.ino = objectid; | |
924 | args.root = root; | |
925 | ||
926 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
927 | btrfs_init_locked_inode, | |
928 | (void *)&args); | |
929 | return inode; | |
930 | } | |
931 | ||
932 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
933 | struct nameidata *nd) | |
934 | { | |
935 | struct inode * inode; | |
936 | struct btrfs_inode *bi = BTRFS_I(dir); | |
937 | struct btrfs_root *root = bi->root; | |
938 | struct btrfs_root *sub_root = root; | |
939 | struct btrfs_key location; | |
940 | int ret; | |
941 | ||
942 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
943 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 944 | |
39279cc3 CM |
945 | mutex_lock(&root->fs_info->fs_mutex); |
946 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
947 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 948 | |
39279cc3 CM |
949 | if (ret < 0) |
950 | return ERR_PTR(ret); | |
5f39d397 | 951 | |
39279cc3 CM |
952 | inode = NULL; |
953 | if (location.objectid) { | |
58176a96 JB |
954 | ret = fixup_tree_root_location(root, &location, &sub_root, |
955 | dentry); | |
39279cc3 CM |
956 | if (ret < 0) |
957 | return ERR_PTR(ret); | |
958 | if (ret > 0) | |
959 | return ERR_PTR(-ENOENT); | |
960 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
961 | sub_root); | |
962 | if (!inode) | |
963 | return ERR_PTR(-EACCES); | |
964 | if (inode->i_state & I_NEW) { | |
965 | /* the inode and parent dir are two different roots */ | |
966 | if (sub_root != root) { | |
967 | igrab(inode); | |
968 | sub_root->inode = inode; | |
969 | } | |
970 | BTRFS_I(inode)->root = sub_root; | |
971 | memcpy(&BTRFS_I(inode)->location, &location, | |
972 | sizeof(location)); | |
973 | btrfs_read_locked_inode(inode); | |
974 | unlock_new_inode(inode); | |
975 | } | |
976 | } | |
977 | return d_splice_alias(inode, dentry); | |
978 | } | |
979 | ||
39279cc3 CM |
980 | static unsigned char btrfs_filetype_table[] = { |
981 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
982 | }; | |
983 | ||
984 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
985 | { | |
986 | struct inode *inode = filp->f_path.dentry->d_inode; | |
987 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
988 | struct btrfs_item *item; | |
989 | struct btrfs_dir_item *di; | |
990 | struct btrfs_key key; | |
5f39d397 | 991 | struct btrfs_key found_key; |
39279cc3 CM |
992 | struct btrfs_path *path; |
993 | int ret; | |
994 | u32 nritems; | |
5f39d397 | 995 | struct extent_buffer *leaf; |
39279cc3 CM |
996 | int slot; |
997 | int advance; | |
998 | unsigned char d_type; | |
999 | int over = 0; | |
1000 | u32 di_cur; | |
1001 | u32 di_total; | |
1002 | u32 di_len; | |
1003 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1004 | char tmp_name[32]; |
1005 | char *name_ptr; | |
1006 | int name_len; | |
39279cc3 CM |
1007 | |
1008 | /* FIXME, use a real flag for deciding about the key type */ | |
1009 | if (root->fs_info->tree_root == root) | |
1010 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1011 | |
39279cc3 CM |
1012 | mutex_lock(&root->fs_info->fs_mutex); |
1013 | key.objectid = inode->i_ino; | |
39279cc3 CM |
1014 | btrfs_set_key_type(&key, key_type); |
1015 | key.offset = filp->f_pos; | |
5f39d397 | 1016 | |
39279cc3 | 1017 | path = btrfs_alloc_path(); |
2cc58cf2 | 1018 | path->reada = 2; |
39279cc3 CM |
1019 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1020 | if (ret < 0) | |
1021 | goto err; | |
1022 | advance = 0; | |
39279cc3 | 1023 | while(1) { |
5f39d397 CM |
1024 | leaf = path->nodes[0]; |
1025 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1026 | slot = path->slots[0]; |
1027 | if (advance || slot >= nritems) { | |
1028 | if (slot >= nritems -1) { | |
39279cc3 CM |
1029 | ret = btrfs_next_leaf(root, path); |
1030 | if (ret) | |
1031 | break; | |
5f39d397 CM |
1032 | leaf = path->nodes[0]; |
1033 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1034 | slot = path->slots[0]; |
1035 | } else { | |
1036 | slot++; | |
1037 | path->slots[0]++; | |
1038 | } | |
1039 | } | |
1040 | advance = 1; | |
5f39d397 CM |
1041 | item = btrfs_item_nr(leaf, slot); |
1042 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1043 | ||
1044 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1045 | break; |
5f39d397 | 1046 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1047 | break; |
5f39d397 | 1048 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1049 | continue; |
5f39d397 CM |
1050 | |
1051 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1052 | advance = 1; |
1053 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1054 | di_cur = 0; | |
5f39d397 | 1055 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1056 | while(di_cur < di_total) { |
5f39d397 CM |
1057 | struct btrfs_key location; |
1058 | ||
1059 | name_len = btrfs_dir_name_len(leaf, di); | |
1060 | if (name_len < 32) { | |
1061 | name_ptr = tmp_name; | |
1062 | } else { | |
1063 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1064 | BUG_ON(!name_ptr); | |
1065 | } | |
1066 | read_extent_buffer(leaf, name_ptr, | |
1067 | (unsigned long)(di + 1), name_len); | |
1068 | ||
1069 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1070 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
1071 | ||
1072 | over = filldir(dirent, name_ptr, name_len, | |
1073 | found_key.offset, | |
1074 | location.objectid, | |
39279cc3 | 1075 | d_type); |
5f39d397 CM |
1076 | |
1077 | if (name_ptr != tmp_name) | |
1078 | kfree(name_ptr); | |
1079 | ||
39279cc3 CM |
1080 | if (over) |
1081 | goto nopos; | |
5f39d397 | 1082 | di_len = btrfs_dir_name_len(leaf, di) + sizeof(*di); |
39279cc3 CM |
1083 | di_cur += di_len; |
1084 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1085 | } | |
1086 | } | |
1087 | filp->f_pos++; | |
1088 | nopos: | |
1089 | ret = 0; | |
1090 | err: | |
1091 | btrfs_release_path(root, path); | |
1092 | btrfs_free_path(path); | |
1093 | mutex_unlock(&root->fs_info->fs_mutex); | |
1094 | return ret; | |
1095 | } | |
1096 | ||
1097 | int btrfs_write_inode(struct inode *inode, int wait) | |
1098 | { | |
1099 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1100 | struct btrfs_trans_handle *trans; | |
1101 | int ret = 0; | |
1102 | ||
1103 | if (wait) { | |
1104 | mutex_lock(&root->fs_info->fs_mutex); | |
1105 | trans = btrfs_start_transaction(root, 1); | |
1106 | btrfs_set_trans_block_group(trans, inode); | |
1107 | ret = btrfs_commit_transaction(trans, root); | |
1108 | mutex_unlock(&root->fs_info->fs_mutex); | |
1109 | } | |
1110 | return ret; | |
1111 | } | |
1112 | ||
1113 | /* | |
54aa1f4d | 1114 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1115 | * inode changes. But, it is most likely to find the inode in cache. |
1116 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1117 | * to keep or drop this code. | |
1118 | */ | |
1119 | void btrfs_dirty_inode(struct inode *inode) | |
1120 | { | |
1121 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1122 | struct btrfs_trans_handle *trans; | |
1123 | ||
1124 | mutex_lock(&root->fs_info->fs_mutex); | |
1125 | trans = btrfs_start_transaction(root, 1); | |
1126 | btrfs_set_trans_block_group(trans, inode); | |
1127 | btrfs_update_inode(trans, root, inode); | |
1128 | btrfs_end_transaction(trans, root); | |
1129 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1130 | } |
1131 | ||
1132 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1133 | struct btrfs_root *root, | |
1134 | u64 objectid, | |
1135 | struct btrfs_block_group_cache *group, | |
1136 | int mode) | |
1137 | { | |
1138 | struct inode *inode; | |
5f39d397 | 1139 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1140 | struct btrfs_key *location; |
5f39d397 | 1141 | struct btrfs_path *path; |
39279cc3 CM |
1142 | int ret; |
1143 | int owner; | |
1144 | ||
5f39d397 CM |
1145 | path = btrfs_alloc_path(); |
1146 | BUG_ON(!path); | |
1147 | ||
39279cc3 CM |
1148 | inode = new_inode(root->fs_info->sb); |
1149 | if (!inode) | |
1150 | return ERR_PTR(-ENOMEM); | |
1151 | ||
b888db2b CM |
1152 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1153 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 1154 | BTRFS_I(inode)->root = root; |
b888db2b | 1155 | |
39279cc3 CM |
1156 | if (mode & S_IFDIR) |
1157 | owner = 0; | |
1158 | else | |
1159 | owner = 1; | |
1160 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1161 | BTRFS_I(inode)->block_group = group; | |
1162 | ||
5f39d397 CM |
1163 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
1164 | if (ret) | |
1165 | goto fail; | |
1166 | ||
39279cc3 CM |
1167 | inode->i_uid = current->fsuid; |
1168 | inode->i_gid = current->fsgid; | |
1169 | inode->i_mode = mode; | |
1170 | inode->i_ino = objectid; | |
1171 | inode->i_blocks = 0; | |
1172 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1173 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1174 | struct btrfs_inode_item); | |
1175 | fill_inode_item(path->nodes[0], inode_item, inode); | |
1176 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1177 | btrfs_free_path(path); | |
1178 | ||
39279cc3 CM |
1179 | location = &BTRFS_I(inode)->location; |
1180 | location->objectid = objectid; | |
39279cc3 CM |
1181 | location->offset = 0; |
1182 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1183 | ||
39279cc3 CM |
1184 | insert_inode_hash(inode); |
1185 | return inode; | |
5f39d397 CM |
1186 | fail: |
1187 | btrfs_free_path(path); | |
1188 | return ERR_PTR(ret); | |
39279cc3 CM |
1189 | } |
1190 | ||
1191 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1192 | { | |
1193 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1194 | } | |
1195 | ||
1196 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1197 | struct dentry *dentry, struct inode *inode) | |
1198 | { | |
1199 | int ret; | |
1200 | struct btrfs_key key; | |
1201 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1202 | struct inode *parent_inode; |
5f39d397 | 1203 | |
39279cc3 | 1204 | key.objectid = inode->i_ino; |
39279cc3 CM |
1205 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1206 | key.offset = 0; | |
1207 | ||
1208 | ret = btrfs_insert_dir_item(trans, root, | |
1209 | dentry->d_name.name, dentry->d_name.len, | |
1210 | dentry->d_parent->d_inode->i_ino, | |
1211 | &key, btrfs_inode_type(inode)); | |
1212 | if (ret == 0) { | |
79c44584 CM |
1213 | parent_inode = dentry->d_parent->d_inode; |
1214 | parent_inode->i_size += dentry->d_name.len * 2; | |
1215 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1216 | ret = btrfs_update_inode(trans, root, |
1217 | dentry->d_parent->d_inode); | |
1218 | } | |
1219 | return ret; | |
1220 | } | |
1221 | ||
1222 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1223 | struct dentry *dentry, struct inode *inode) | |
1224 | { | |
1225 | int err = btrfs_add_link(trans, dentry, inode); | |
1226 | if (!err) { | |
1227 | d_instantiate(dentry, inode); | |
1228 | return 0; | |
1229 | } | |
1230 | if (err > 0) | |
1231 | err = -EEXIST; | |
1232 | return err; | |
1233 | } | |
1234 | ||
618e21d5 JB |
1235 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1236 | int mode, dev_t rdev) | |
1237 | { | |
1238 | struct btrfs_trans_handle *trans; | |
1239 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1240 | struct inode *inode; | |
1241 | int err; | |
1242 | int drop_inode = 0; | |
1243 | u64 objectid; | |
d3c2fdcf | 1244 | unsigned long nr; |
618e21d5 JB |
1245 | |
1246 | if (!new_valid_dev(rdev)) | |
1247 | return -EINVAL; | |
1248 | ||
1249 | mutex_lock(&root->fs_info->fs_mutex); | |
1250 | trans = btrfs_start_transaction(root, 1); | |
1251 | btrfs_set_trans_block_group(trans, dir); | |
1252 | ||
1253 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1254 | if (err) { | |
1255 | err = -ENOSPC; | |
1256 | goto out_unlock; | |
1257 | } | |
1258 | ||
1259 | inode = btrfs_new_inode(trans, root, objectid, | |
1260 | BTRFS_I(dir)->block_group, mode); | |
1261 | err = PTR_ERR(inode); | |
1262 | if (IS_ERR(inode)) | |
1263 | goto out_unlock; | |
1264 | ||
1265 | btrfs_set_trans_block_group(trans, inode); | |
1266 | err = btrfs_add_nondir(trans, dentry, inode); | |
1267 | if (err) | |
1268 | drop_inode = 1; | |
1269 | else { | |
1270 | inode->i_op = &btrfs_special_inode_operations; | |
1271 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1272 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1273 | } |
1274 | dir->i_sb->s_dirt = 1; | |
1275 | btrfs_update_inode_block_group(trans, inode); | |
1276 | btrfs_update_inode_block_group(trans, dir); | |
1277 | out_unlock: | |
d3c2fdcf | 1278 | nr = trans->blocks_used; |
618e21d5 JB |
1279 | btrfs_end_transaction(trans, root); |
1280 | mutex_unlock(&root->fs_info->fs_mutex); | |
1281 | ||
1282 | if (drop_inode) { | |
1283 | inode_dec_link_count(inode); | |
1284 | iput(inode); | |
1285 | } | |
d3c2fdcf | 1286 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
1287 | return err; |
1288 | } | |
1289 | ||
39279cc3 CM |
1290 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1291 | int mode, struct nameidata *nd) | |
1292 | { | |
1293 | struct btrfs_trans_handle *trans; | |
1294 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1295 | struct inode *inode; | |
1296 | int err; | |
1297 | int drop_inode = 0; | |
d3c2fdcf | 1298 | unsigned long nr; |
39279cc3 CM |
1299 | u64 objectid; |
1300 | ||
1301 | mutex_lock(&root->fs_info->fs_mutex); | |
1302 | trans = btrfs_start_transaction(root, 1); | |
1303 | btrfs_set_trans_block_group(trans, dir); | |
1304 | ||
1305 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1306 | if (err) { | |
1307 | err = -ENOSPC; | |
1308 | goto out_unlock; | |
1309 | } | |
1310 | ||
1311 | inode = btrfs_new_inode(trans, root, objectid, | |
1312 | BTRFS_I(dir)->block_group, mode); | |
1313 | err = PTR_ERR(inode); | |
1314 | if (IS_ERR(inode)) | |
1315 | goto out_unlock; | |
1316 | ||
1317 | btrfs_set_trans_block_group(trans, inode); | |
1318 | err = btrfs_add_nondir(trans, dentry, inode); | |
1319 | if (err) | |
1320 | drop_inode = 1; | |
1321 | else { | |
1322 | inode->i_mapping->a_ops = &btrfs_aops; | |
1323 | inode->i_fop = &btrfs_file_operations; | |
1324 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1325 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1326 | inode->i_mapping, GFP_NOFS); | |
07157aac | 1327 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
1328 | } |
1329 | dir->i_sb->s_dirt = 1; | |
1330 | btrfs_update_inode_block_group(trans, inode); | |
1331 | btrfs_update_inode_block_group(trans, dir); | |
1332 | out_unlock: | |
d3c2fdcf | 1333 | nr = trans->blocks_used; |
39279cc3 CM |
1334 | btrfs_end_transaction(trans, root); |
1335 | mutex_unlock(&root->fs_info->fs_mutex); | |
1336 | ||
1337 | if (drop_inode) { | |
1338 | inode_dec_link_count(inode); | |
1339 | iput(inode); | |
1340 | } | |
d3c2fdcf | 1341 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1342 | return err; |
1343 | } | |
1344 | ||
1345 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1346 | struct dentry *dentry) | |
1347 | { | |
1348 | struct btrfs_trans_handle *trans; | |
1349 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1350 | struct inode *inode = old_dentry->d_inode; | |
d3c2fdcf | 1351 | unsigned long nr; |
39279cc3 CM |
1352 | int err; |
1353 | int drop_inode = 0; | |
1354 | ||
1355 | if (inode->i_nlink == 0) | |
1356 | return -ENOENT; | |
1357 | ||
1358 | inc_nlink(inode); | |
1359 | mutex_lock(&root->fs_info->fs_mutex); | |
1360 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1361 | |
39279cc3 CM |
1362 | btrfs_set_trans_block_group(trans, dir); |
1363 | atomic_inc(&inode->i_count); | |
1364 | err = btrfs_add_nondir(trans, dentry, inode); | |
5f39d397 | 1365 | |
39279cc3 CM |
1366 | if (err) |
1367 | drop_inode = 1; | |
5f39d397 | 1368 | |
39279cc3 CM |
1369 | dir->i_sb->s_dirt = 1; |
1370 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1371 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1372 | |
54aa1f4d CM |
1373 | if (err) |
1374 | drop_inode = 1; | |
39279cc3 | 1375 | |
d3c2fdcf | 1376 | nr = trans->blocks_used; |
39279cc3 CM |
1377 | btrfs_end_transaction(trans, root); |
1378 | mutex_unlock(&root->fs_info->fs_mutex); | |
1379 | ||
1380 | if (drop_inode) { | |
1381 | inode_dec_link_count(inode); | |
1382 | iput(inode); | |
1383 | } | |
d3c2fdcf | 1384 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1385 | return err; |
1386 | } | |
1387 | ||
1388 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, | |
1389 | struct btrfs_root *root, | |
1390 | u64 objectid, u64 dirid) | |
1391 | { | |
1392 | int ret; | |
1393 | char buf[2]; | |
1394 | struct btrfs_key key; | |
1395 | ||
1396 | buf[0] = '.'; | |
1397 | buf[1] = '.'; | |
1398 | ||
1399 | key.objectid = objectid; | |
1400 | key.offset = 0; | |
39279cc3 CM |
1401 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1402 | ||
1403 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, | |
1404 | &key, BTRFS_FT_DIR); | |
1405 | if (ret) | |
1406 | goto error; | |
5f39d397 | 1407 | |
39279cc3 CM |
1408 | key.objectid = dirid; |
1409 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
1410 | &key, BTRFS_FT_DIR); | |
1411 | if (ret) | |
1412 | goto error; | |
1413 | error: | |
1414 | return ret; | |
1415 | } | |
1416 | ||
1417 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1418 | { | |
1419 | struct inode *inode; | |
1420 | struct btrfs_trans_handle *trans; | |
1421 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1422 | int err = 0; | |
1423 | int drop_on_err = 0; | |
1424 | u64 objectid; | |
d3c2fdcf | 1425 | unsigned long nr = 1; |
39279cc3 CM |
1426 | |
1427 | mutex_lock(&root->fs_info->fs_mutex); | |
1428 | trans = btrfs_start_transaction(root, 1); | |
1429 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1430 | |
39279cc3 CM |
1431 | if (IS_ERR(trans)) { |
1432 | err = PTR_ERR(trans); | |
1433 | goto out_unlock; | |
1434 | } | |
1435 | ||
1436 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1437 | if (err) { | |
1438 | err = -ENOSPC; | |
1439 | goto out_unlock; | |
1440 | } | |
1441 | ||
1442 | inode = btrfs_new_inode(trans, root, objectid, | |
1443 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1444 | if (IS_ERR(inode)) { | |
1445 | err = PTR_ERR(inode); | |
1446 | goto out_fail; | |
1447 | } | |
5f39d397 | 1448 | |
39279cc3 CM |
1449 | drop_on_err = 1; |
1450 | inode->i_op = &btrfs_dir_inode_operations; | |
1451 | inode->i_fop = &btrfs_dir_file_operations; | |
1452 | btrfs_set_trans_block_group(trans, inode); | |
1453 | ||
1454 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); | |
1455 | if (err) | |
1456 | goto out_fail; | |
1457 | ||
1458 | inode->i_size = 6; | |
1459 | err = btrfs_update_inode(trans, root, inode); | |
1460 | if (err) | |
1461 | goto out_fail; | |
5f39d397 | 1462 | |
39279cc3 CM |
1463 | err = btrfs_add_link(trans, dentry, inode); |
1464 | if (err) | |
1465 | goto out_fail; | |
5f39d397 | 1466 | |
39279cc3 CM |
1467 | d_instantiate(dentry, inode); |
1468 | drop_on_err = 0; | |
1469 | dir->i_sb->s_dirt = 1; | |
1470 | btrfs_update_inode_block_group(trans, inode); | |
1471 | btrfs_update_inode_block_group(trans, dir); | |
1472 | ||
1473 | out_fail: | |
d3c2fdcf | 1474 | nr = trans->blocks_used; |
39279cc3 | 1475 | btrfs_end_transaction(trans, root); |
5f39d397 | 1476 | |
39279cc3 CM |
1477 | out_unlock: |
1478 | mutex_unlock(&root->fs_info->fs_mutex); | |
1479 | if (drop_on_err) | |
1480 | iput(inode); | |
d3c2fdcf | 1481 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1482 | return err; |
1483 | } | |
1484 | ||
a52d9a80 CM |
1485 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1486 | size_t page_offset, u64 start, u64 end, | |
1487 | int create) | |
1488 | { | |
1489 | int ret; | |
1490 | int err = 0; | |
db94535d | 1491 | u64 bytenr; |
a52d9a80 CM |
1492 | u64 extent_start = 0; |
1493 | u64 extent_end = 0; | |
1494 | u64 objectid = inode->i_ino; | |
1495 | u32 found_type; | |
1496 | int failed_insert = 0; | |
1497 | struct btrfs_path *path; | |
1498 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1499 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1500 | struct extent_buffer *leaf; |
1501 | struct btrfs_key found_key; | |
a52d9a80 CM |
1502 | struct extent_map *em = NULL; |
1503 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1504 | struct btrfs_trans_handle *trans = NULL; | |
1505 | ||
1506 | path = btrfs_alloc_path(); | |
1507 | BUG_ON(!path); | |
1508 | mutex_lock(&root->fs_info->fs_mutex); | |
1509 | ||
1510 | again: | |
1511 | em = lookup_extent_mapping(em_tree, start, end); | |
1512 | if (em) { | |
1513 | goto out; | |
1514 | } | |
1515 | if (!em) { | |
1516 | em = alloc_extent_map(GFP_NOFS); | |
1517 | if (!em) { | |
1518 | err = -ENOMEM; | |
1519 | goto out; | |
1520 | } | |
5f39d397 CM |
1521 | em->start = EXTENT_MAP_HOLE; |
1522 | em->end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1523 | } |
1524 | em->bdev = inode->i_sb->s_bdev; | |
1525 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
1526 | objectid, start, 0); | |
1527 | if (ret < 0) { | |
1528 | err = ret; | |
1529 | goto out; | |
1530 | } | |
1531 | ||
1532 | if (ret != 0) { | |
1533 | if (path->slots[0] == 0) | |
1534 | goto not_found; | |
1535 | path->slots[0]--; | |
1536 | } | |
1537 | ||
5f39d397 CM |
1538 | leaf = path->nodes[0]; |
1539 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1540 | struct btrfs_file_extent_item); |
a52d9a80 | 1541 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1542 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1543 | found_type = btrfs_key_type(&found_key); | |
1544 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1545 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1546 | goto not_found; | |
1547 | } | |
1548 | ||
5f39d397 CM |
1549 | found_type = btrfs_file_extent_type(leaf, item); |
1550 | extent_start = found_key.offset; | |
a52d9a80 CM |
1551 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1552 | extent_end = extent_start + | |
db94535d | 1553 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1554 | err = 0; |
b888db2b | 1555 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1556 | em->start = start; |
1557 | if (start < extent_start) { | |
b888db2b CM |
1558 | if (end < extent_start) |
1559 | goto not_found; | |
a52d9a80 CM |
1560 | em->end = extent_end - 1; |
1561 | } else { | |
1562 | em->end = end; | |
1563 | } | |
1564 | goto not_found_em; | |
1565 | } | |
db94535d CM |
1566 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1567 | if (bytenr == 0) { | |
a52d9a80 CM |
1568 | em->start = extent_start; |
1569 | em->end = extent_end - 1; | |
5f39d397 CM |
1570 | em->block_start = EXTENT_MAP_HOLE; |
1571 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1572 | goto insert; |
1573 | } | |
db94535d CM |
1574 | bytenr += btrfs_file_extent_offset(leaf, item); |
1575 | em->block_start = bytenr; | |
a52d9a80 | 1576 | em->block_end = em->block_start + |
db94535d | 1577 | btrfs_file_extent_num_bytes(leaf, item) - 1; |
a52d9a80 CM |
1578 | em->start = extent_start; |
1579 | em->end = extent_end - 1; | |
1580 | goto insert; | |
1581 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1582 | unsigned long ptr; |
a52d9a80 CM |
1583 | char *map; |
1584 | u32 size; | |
1585 | ||
5f39d397 CM |
1586 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1587 | path->slots[0])); | |
1588 | ||
db94535d CM |
1589 | extent_end = (extent_start + size) | |
1590 | ((u64)root->sectorsize - 1); | |
b888db2b | 1591 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1592 | em->start = start; |
1593 | if (start < extent_start) { | |
b888db2b CM |
1594 | if (end < extent_start) |
1595 | goto not_found; | |
50b78c24 | 1596 | em->end = extent_end; |
a52d9a80 CM |
1597 | } else { |
1598 | em->end = end; | |
1599 | } | |
1600 | goto not_found_em; | |
1601 | } | |
5f39d397 | 1602 | |
a52d9a80 CM |
1603 | em->block_start = EXTENT_MAP_INLINE; |
1604 | em->block_end = EXTENT_MAP_INLINE; | |
1605 | em->start = extent_start; | |
50b78c24 | 1606 | em->end = extent_end; |
5f39d397 | 1607 | |
a52d9a80 CM |
1608 | if (!page) { |
1609 | goto insert; | |
1610 | } | |
5f39d397 | 1611 | |
a52d9a80 CM |
1612 | ptr = btrfs_file_extent_inline_start(item); |
1613 | map = kmap(page); | |
5f39d397 | 1614 | read_extent_buffer(leaf, map + page_offset, ptr, size); |
db94535d | 1615 | /* |
50b78c24 | 1616 | memset(map + page_offset + size, 0, |
5f39d397 | 1617 | root->sectorsize - (page_offset + size)); |
db94535d | 1618 | */ |
50b78c24 | 1619 | flush_dcache_page(page); |
a52d9a80 CM |
1620 | kunmap(page); |
1621 | set_extent_uptodate(em_tree, extent_start, | |
50b78c24 | 1622 | extent_end, GFP_NOFS); |
a52d9a80 CM |
1623 | goto insert; |
1624 | } else { | |
1625 | printk("unkknown found_type %d\n", found_type); | |
1626 | WARN_ON(1); | |
1627 | } | |
1628 | not_found: | |
1629 | em->start = start; | |
1630 | em->end = end; | |
1631 | not_found_em: | |
5f39d397 CM |
1632 | em->block_start = EXTENT_MAP_HOLE; |
1633 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1634 | insert: |
1635 | btrfs_release_path(root, path); | |
1636 | if (em->start > start || em->end < start) { | |
b888db2b | 1637 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1638 | err = -EIO; |
1639 | goto out; | |
1640 | } | |
1641 | ret = add_extent_mapping(em_tree, em); | |
1642 | if (ret == -EEXIST) { | |
1643 | free_extent_map(em); | |
2bf5a725 | 1644 | em = NULL; |
a52d9a80 CM |
1645 | failed_insert++; |
1646 | if (failed_insert > 5) { | |
1647 | printk("failing to insert %Lu %Lu\n", start, end); | |
1648 | err = -EIO; | |
1649 | goto out; | |
1650 | } | |
a52d9a80 CM |
1651 | goto again; |
1652 | } | |
1653 | err = 0; | |
1654 | out: | |
1655 | btrfs_free_path(path); | |
1656 | if (trans) { | |
1657 | ret = btrfs_end_transaction(trans, root); | |
1658 | if (!err) | |
1659 | err = ret; | |
1660 | } | |
1661 | mutex_unlock(&root->fs_info->fs_mutex); | |
1662 | if (err) { | |
1663 | free_extent_map(em); | |
1664 | WARN_ON(1); | |
1665 | return ERR_PTR(err); | |
1666 | } | |
1667 | return em; | |
1668 | } | |
1669 | ||
d396c6f5 | 1670 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 1671 | { |
d396c6f5 | 1672 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
1673 | } |
1674 | ||
1675 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1676 | unsigned from, unsigned to) | |
1677 | { | |
a52d9a80 CM |
1678 | return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1679 | page->mapping->host, page, from, to, | |
1680 | btrfs_get_extent); | |
39279cc3 CM |
1681 | } |
1682 | ||
a52d9a80 | 1683 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1684 | { |
a52d9a80 CM |
1685 | struct extent_map_tree *tree; |
1686 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1687 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1688 | } |
a52d9a80 | 1689 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 1690 | { |
a52d9a80 | 1691 | struct extent_map_tree *tree; |
b888db2b CM |
1692 | |
1693 | ||
1694 | if (current->flags & PF_MEMALLOC) { | |
1695 | redirty_page_for_writepage(wbc, page); | |
1696 | unlock_page(page); | |
1697 | return 0; | |
1698 | } | |
a52d9a80 CM |
1699 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1700 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
1701 | } |
1702 | ||
a52d9a80 | 1703 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 1704 | { |
a52d9a80 CM |
1705 | struct extent_map_tree *tree; |
1706 | int ret; | |
8c2383c3 | 1707 | |
a52d9a80 CM |
1708 | if (page->private != 1) { |
1709 | WARN_ON(1); | |
1710 | return try_to_free_buffers(page); | |
39279cc3 | 1711 | } |
a52d9a80 CM |
1712 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1713 | ret = try_release_extent_mapping(tree, page); | |
1714 | if (ret == 1) { | |
1715 | ClearPagePrivate(page); | |
1716 | set_page_private(page, 0); | |
1717 | page_cache_release(page); | |
39279cc3 | 1718 | } |
a52d9a80 | 1719 | return ret; |
39279cc3 CM |
1720 | } |
1721 | ||
a52d9a80 | 1722 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 1723 | { |
a52d9a80 | 1724 | struct extent_map_tree *tree; |
39279cc3 | 1725 | |
a52d9a80 CM |
1726 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1727 | extent_invalidatepage(tree, page, offset); | |
1728 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
1729 | } |
1730 | ||
9ebefb18 CM |
1731 | /* |
1732 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
1733 | * called from a page fault handler when a page is first dirtied. Hence we must | |
1734 | * be careful to check for EOF conditions here. We set the page up correctly | |
1735 | * for a written page which means we get ENOSPC checking when writing into | |
1736 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
1737 | * support these features. | |
1738 | * | |
1739 | * We are not allowed to take the i_mutex here so we have to play games to | |
1740 | * protect against truncate races as the page could now be beyond EOF. Because | |
1741 | * vmtruncate() writes the inode size before removing pages, once we have the | |
1742 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
1743 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
1744 | * unlock the page. | |
1745 | */ | |
1746 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
1747 | { | |
1748 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
1749 | unsigned long end; | |
1750 | loff_t size; | |
1751 | int ret = -EINVAL; | |
a52d9a80 | 1752 | u64 page_start; |
9ebefb18 | 1753 | |
011410bd | 1754 | down_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1755 | lock_page(page); |
1756 | wait_on_page_writeback(page); | |
9ebefb18 | 1757 | size = i_size_read(inode); |
a52d9a80 CM |
1758 | page_start = page->index << PAGE_CACHE_SHIFT; |
1759 | ||
9ebefb18 | 1760 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 1761 | (page_start > size)) { |
9ebefb18 CM |
1762 | /* page got truncated out from underneath us */ |
1763 | goto out_unlock; | |
1764 | } | |
1765 | ||
1766 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 1767 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
1768 | end = size & ~PAGE_CACHE_MASK; |
1769 | else | |
1770 | end = PAGE_CACHE_SIZE; | |
1771 | ||
b888db2b | 1772 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
1773 | |
1774 | out_unlock: | |
011410bd | 1775 | up_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1776 | unlock_page(page); |
1777 | return ret; | |
1778 | } | |
1779 | ||
39279cc3 CM |
1780 | static void btrfs_truncate(struct inode *inode) |
1781 | { | |
1782 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1783 | int ret; | |
1784 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 1785 | unsigned long nr; |
39279cc3 CM |
1786 | |
1787 | if (!S_ISREG(inode->i_mode)) | |
1788 | return; | |
1789 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1790 | return; | |
1791 | ||
1792 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
1793 | ||
1794 | mutex_lock(&root->fs_info->fs_mutex); | |
1795 | trans = btrfs_start_transaction(root, 1); | |
1796 | btrfs_set_trans_block_group(trans, inode); | |
1797 | ||
1798 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1799 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 | 1800 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 1801 | nr = trans->blocks_used; |
5f39d397 | 1802 | |
39279cc3 CM |
1803 | ret = btrfs_end_transaction(trans, root); |
1804 | BUG_ON(ret); | |
1805 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1806 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1807 | } |
1808 | ||
1809 | int btrfs_commit_write(struct file *file, struct page *page, | |
1810 | unsigned from, unsigned to) | |
1811 | { | |
a52d9a80 CM |
1812 | return extent_commit_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1813 | page->mapping->host, page, from, to); | |
39279cc3 CM |
1814 | } |
1815 | ||
1816 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) | |
1817 | { | |
1818 | struct btrfs_trans_handle *trans; | |
1819 | struct btrfs_key key; | |
1820 | struct btrfs_root_item root_item; | |
1821 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 1822 | struct extent_buffer *leaf; |
39279cc3 CM |
1823 | struct btrfs_root *new_root; |
1824 | struct inode *inode; | |
1825 | struct inode *dir; | |
1826 | int ret; | |
54aa1f4d | 1827 | int err; |
39279cc3 CM |
1828 | u64 objectid; |
1829 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 1830 | unsigned long nr = 1; |
39279cc3 CM |
1831 | |
1832 | mutex_lock(&root->fs_info->fs_mutex); | |
1833 | trans = btrfs_start_transaction(root, 1); | |
1834 | BUG_ON(!trans); | |
1835 | ||
db94535d | 1836 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 0); |
5f39d397 CM |
1837 | if (IS_ERR(leaf)) |
1838 | return PTR_ERR(leaf); | |
1839 | ||
1840 | btrfs_set_header_nritems(leaf, 0); | |
1841 | btrfs_set_header_level(leaf, 0); | |
db94535d | 1842 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 CM |
1843 | btrfs_set_header_generation(leaf, trans->transid); |
1844 | btrfs_set_header_owner(leaf, root->root_key.objectid); | |
1845 | write_extent_buffer(leaf, root->fs_info->fsid, | |
1846 | (unsigned long)btrfs_header_fsid(leaf), | |
1847 | BTRFS_FSID_SIZE); | |
1848 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
1849 | |
1850 | inode_item = &root_item.inode; | |
1851 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
1852 | inode_item->generation = cpu_to_le64(1); |
1853 | inode_item->size = cpu_to_le64(3); | |
1854 | inode_item->nlink = cpu_to_le32(1); | |
1855 | inode_item->nblocks = cpu_to_le64(1); | |
1856 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 1857 | |
db94535d CM |
1858 | btrfs_set_root_bytenr(&root_item, leaf->start); |
1859 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 1860 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
1861 | btrfs_set_root_used(&root_item, 0); |
1862 | ||
5eda7b5e CM |
1863 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
1864 | root_item.drop_level = 0; | |
5f39d397 CM |
1865 | |
1866 | free_extent_buffer(leaf); | |
1867 | leaf = NULL; | |
39279cc3 CM |
1868 | |
1869 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
1870 | 0, &objectid); | |
54aa1f4d CM |
1871 | if (ret) |
1872 | goto fail; | |
39279cc3 CM |
1873 | |
1874 | btrfs_set_root_dirid(&root_item, new_dirid); | |
1875 | ||
1876 | key.objectid = objectid; | |
1877 | key.offset = 1; | |
39279cc3 CM |
1878 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
1879 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1880 | &root_item); | |
54aa1f4d CM |
1881 | if (ret) |
1882 | goto fail; | |
39279cc3 CM |
1883 | |
1884 | /* | |
1885 | * insert the directory item | |
1886 | */ | |
1887 | key.offset = (u64)-1; | |
1888 | dir = root->fs_info->sb->s_root->d_inode; | |
1889 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1890 | name, namelen, dir->i_ino, &key, | |
1891 | BTRFS_FT_DIR); | |
54aa1f4d CM |
1892 | if (ret) |
1893 | goto fail; | |
39279cc3 CM |
1894 | |
1895 | ret = btrfs_commit_transaction(trans, root); | |
54aa1f4d CM |
1896 | if (ret) |
1897 | goto fail_commit; | |
39279cc3 | 1898 | |
58176a96 | 1899 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
1900 | BUG_ON(!new_root); |
1901 | ||
1902 | trans = btrfs_start_transaction(new_root, 1); | |
1903 | BUG_ON(!trans); | |
1904 | ||
1905 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
1906 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
1907 | if (IS_ERR(inode)) |
1908 | goto fail; | |
39279cc3 CM |
1909 | inode->i_op = &btrfs_dir_inode_operations; |
1910 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 1911 | new_root->inode = inode; |
39279cc3 CM |
1912 | |
1913 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
54aa1f4d CM |
1914 | if (ret) |
1915 | goto fail; | |
39279cc3 CM |
1916 | |
1917 | inode->i_nlink = 1; | |
1918 | inode->i_size = 6; | |
1919 | ret = btrfs_update_inode(trans, new_root, inode); | |
54aa1f4d CM |
1920 | if (ret) |
1921 | goto fail; | |
1922 | fail: | |
d3c2fdcf | 1923 | nr = trans->blocks_used; |
54aa1f4d CM |
1924 | err = btrfs_commit_transaction(trans, root); |
1925 | if (err && !ret) | |
1926 | ret = err; | |
1927 | fail_commit: | |
39279cc3 | 1928 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 1929 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 1930 | return ret; |
39279cc3 CM |
1931 | } |
1932 | ||
1933 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
1934 | { | |
1935 | struct btrfs_trans_handle *trans; | |
1936 | struct btrfs_key key; | |
1937 | struct btrfs_root_item new_root_item; | |
5f39d397 | 1938 | struct extent_buffer *tmp; |
39279cc3 | 1939 | int ret; |
54aa1f4d | 1940 | int err; |
39279cc3 | 1941 | u64 objectid; |
d3c2fdcf | 1942 | unsigned long nr; |
39279cc3 CM |
1943 | |
1944 | if (!root->ref_cows) | |
1945 | return -EINVAL; | |
1946 | ||
011410bd CM |
1947 | down_write(&root->snap_sem); |
1948 | freeze_bdev(root->fs_info->sb->s_bdev); | |
1949 | thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb); | |
1950 | ||
39279cc3 CM |
1951 | mutex_lock(&root->fs_info->fs_mutex); |
1952 | trans = btrfs_start_transaction(root, 1); | |
1953 | BUG_ON(!trans); | |
1954 | ||
1955 | ret = btrfs_update_inode(trans, root, root->inode); | |
54aa1f4d CM |
1956 | if (ret) |
1957 | goto fail; | |
39279cc3 CM |
1958 | |
1959 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
1960 | 0, &objectid); | |
54aa1f4d CM |
1961 | if (ret) |
1962 | goto fail; | |
39279cc3 CM |
1963 | |
1964 | memcpy(&new_root_item, &root->root_item, | |
1965 | sizeof(new_root_item)); | |
1966 | ||
1967 | key.objectid = objectid; | |
1968 | key.offset = 1; | |
39279cc3 | 1969 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
5f39d397 | 1970 | |
83df7c1d | 1971 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); |
db94535d CM |
1972 | btrfs_set_root_bytenr(&new_root_item, root->node->start); |
1973 | btrfs_set_root_level(&new_root_item, btrfs_header_level(root->node)); | |
39279cc3 CM |
1974 | |
1975 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1976 | &new_root_item); | |
54aa1f4d CM |
1977 | if (ret) |
1978 | goto fail; | |
39279cc3 CM |
1979 | |
1980 | /* | |
1981 | * insert the directory item | |
1982 | */ | |
1983 | key.offset = (u64)-1; | |
1984 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1985 | name, namelen, | |
1986 | root->fs_info->sb->s_root->d_inode->i_ino, | |
1987 | &key, BTRFS_FT_DIR); | |
1988 | ||
54aa1f4d CM |
1989 | if (ret) |
1990 | goto fail; | |
39279cc3 CM |
1991 | |
1992 | ret = btrfs_inc_root_ref(trans, root); | |
54aa1f4d CM |
1993 | if (ret) |
1994 | goto fail; | |
54aa1f4d | 1995 | fail: |
d3c2fdcf | 1996 | nr = trans->blocks_used; |
54aa1f4d | 1997 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 1998 | |
54aa1f4d CM |
1999 | if (err && !ret) |
2000 | ret = err; | |
5f39d397 | 2001 | |
39279cc3 | 2002 | mutex_unlock(&root->fs_info->fs_mutex); |
011410bd | 2003 | up_write(&root->snap_sem); |
d3c2fdcf | 2004 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2005 | return ret; |
39279cc3 CM |
2006 | } |
2007 | ||
86479a04 CM |
2008 | static unsigned long force_ra(struct address_space *mapping, |
2009 | struct file_ra_state *ra, struct file *file, | |
2010 | pgoff_t offset, pgoff_t last_index) | |
2011 | { | |
2012 | pgoff_t req_size; | |
2013 | ||
2014 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2015 | req_size = last_index - offset + 1; | |
2016 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2017 | return offset; | |
2018 | #else | |
2019 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2020 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2021 | return offset + req_size; | |
2022 | #endif | |
2023 | } | |
2024 | ||
2025 | int btrfs_defrag_file(struct file *file) { | |
2026 | struct inode *inode = file->f_path.dentry->d_inode; | |
2027 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2028 | struct page *page; | |
2029 | unsigned long last_index; | |
2030 | unsigned long ra_index = 0; | |
2031 | u64 page_start; | |
2032 | u64 page_end; | |
2033 | unsigned long i; | |
2034 | ||
2035 | mutex_lock(&inode->i_mutex); | |
2036 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2037 | for (i = 0; i <= last_index; i++) { | |
2038 | if (i == ra_index) { | |
2039 | ra_index = force_ra(inode->i_mapping, &file->f_ra, | |
2040 | file, ra_index, last_index); | |
2041 | } | |
2042 | page = grab_cache_page(inode->i_mapping, i); | |
2043 | if (!page) | |
2044 | goto out_unlock; | |
2045 | if (!PageUptodate(page)) { | |
2046 | btrfs_readpage(NULL, page); | |
2047 | lock_page(page); | |
2048 | if (!PageUptodate(page)) { | |
2049 | unlock_page(page); | |
2050 | page_cache_release(page); | |
2051 | goto out_unlock; | |
2052 | } | |
2053 | } | |
2054 | page_start = page->index << PAGE_CACHE_SHIFT; | |
2055 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
2056 | ||
2057 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2058 | set_extent_delalloc(em_tree, page_start, | |
2059 | page_end, GFP_NOFS); | |
2060 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2061 | set_page_dirty(page); | |
2062 | unlock_page(page); | |
2063 | page_cache_release(page); | |
2064 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2065 | } | |
2066 | ||
2067 | out_unlock: | |
2068 | mutex_unlock(&inode->i_mutex); | |
2069 | return 0; | |
2070 | } | |
2071 | ||
d03581f4 | 2072 | static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg) |
39279cc3 | 2073 | { |
39279cc3 | 2074 | struct btrfs_ioctl_vol_args vol_args; |
39279cc3 | 2075 | struct btrfs_dir_item *di; |
39279cc3 | 2076 | struct btrfs_path *path; |
d03581f4 | 2077 | int namelen; |
39279cc3 CM |
2078 | u64 root_dirid; |
2079 | ||
d03581f4 CH |
2080 | if (copy_from_user(&vol_args, arg, sizeof(vol_args))) |
2081 | return -EFAULT; | |
5f39d397 | 2082 | |
d03581f4 CH |
2083 | namelen = strlen(vol_args.name); |
2084 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2085 | return -EINVAL; | |
2086 | if (strchr(vol_args.name, '/')) | |
2087 | return -EINVAL; | |
2088 | ||
2089 | path = btrfs_alloc_path(); | |
2090 | if (!path) | |
2091 | return -ENOMEM; | |
2092 | ||
2093 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2094 | mutex_lock(&root->fs_info->fs_mutex); | |
2095 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2096 | path, root_dirid, | |
2097 | vol_args.name, namelen, 0); | |
2098 | mutex_unlock(&root->fs_info->fs_mutex); | |
2099 | btrfs_free_path(path); | |
2100 | if (di && !IS_ERR(di)) | |
2101 | return -EEXIST; | |
2102 | if (IS_ERR(di)) | |
2103 | return PTR_ERR(di); | |
2104 | ||
2105 | if (root == root->fs_info->tree_root) | |
2106 | return create_subvol(root, vol_args.name, namelen); | |
2107 | return create_snapshot(root, vol_args.name, namelen); | |
2108 | } | |
2109 | ||
2110 | static int btrfs_ioctl_defrag(struct file *file) | |
2111 | { | |
2112 | struct inode *inode = file->f_path.dentry->d_inode; | |
2113 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2114 | ||
2115 | switch (inode->i_mode & S_IFMT) { | |
2116 | case S_IFDIR: | |
39279cc3 | 2117 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2118 | btrfs_defrag_root(root, 0); |
2119 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2120 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2121 | break; |
d03581f4 CH |
2122 | case S_IFREG: |
2123 | btrfs_defrag_file(file); | |
2124 | break; | |
2125 | } | |
2126 | ||
2127 | return 0; | |
2128 | } | |
6702ed49 | 2129 | |
d03581f4 CH |
2130 | long btrfs_ioctl(struct file *file, unsigned int |
2131 | cmd, unsigned long arg) | |
2132 | { | |
2133 | struct btrfs_root *root = BTRFS_I(file->f_path.dentry->d_inode)->root; | |
2134 | ||
2135 | switch (cmd) { | |
2136 | case BTRFS_IOC_SNAP_CREATE: | |
2137 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2138 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2139 | return btrfs_ioctl_defrag(file); |
39279cc3 | 2140 | } |
d03581f4 CH |
2141 | |
2142 | return -ENOTTY; | |
39279cc3 CM |
2143 | } |
2144 | ||
39279cc3 CM |
2145 | /* |
2146 | * Called inside transaction, so use GFP_NOFS | |
2147 | */ | |
2148 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2149 | { | |
2150 | struct btrfs_inode *ei; | |
2151 | ||
2152 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2153 | if (!ei) | |
2154 | return NULL; | |
15ee9bc7 | 2155 | ei->last_trans = 0; |
39279cc3 CM |
2156 | return &ei->vfs_inode; |
2157 | } | |
2158 | ||
2159 | void btrfs_destroy_inode(struct inode *inode) | |
2160 | { | |
2161 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2162 | WARN_ON(inode->i_data.nrpages); | |
2163 | ||
2164 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2165 | } | |
2166 | ||
2167 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2168 | unsigned long flags) | |
2169 | { | |
2170 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2171 | ||
2172 | inode_init_once(&ei->vfs_inode); | |
2173 | } | |
2174 | ||
2175 | void btrfs_destroy_cachep(void) | |
2176 | { | |
2177 | if (btrfs_inode_cachep) | |
2178 | kmem_cache_destroy(btrfs_inode_cachep); | |
2179 | if (btrfs_trans_handle_cachep) | |
2180 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2181 | if (btrfs_transaction_cachep) | |
2182 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2183 | if (btrfs_bit_radix_cachep) | |
2184 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2185 | if (btrfs_path_cachep) | |
2186 | kmem_cache_destroy(btrfs_path_cachep); | |
2187 | } | |
2188 | ||
86479a04 | 2189 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d CM |
2190 | unsigned long extra_flags, |
2191 | void (*ctor)(void *, struct kmem_cache *, | |
2192 | unsigned long)) | |
2193 | { | |
2194 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2195 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2196 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2197 | ,NULL | |
2198 | #endif | |
2199 | ); | |
2200 | } | |
2201 | ||
39279cc3 CM |
2202 | int btrfs_init_cachep(void) |
2203 | { | |
86479a04 | 2204 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2205 | sizeof(struct btrfs_inode), |
2206 | 0, init_once); | |
39279cc3 CM |
2207 | if (!btrfs_inode_cachep) |
2208 | goto fail; | |
86479a04 CM |
2209 | btrfs_trans_handle_cachep = |
2210 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2211 | sizeof(struct btrfs_trans_handle), | |
2212 | 0, NULL); | |
39279cc3 CM |
2213 | if (!btrfs_trans_handle_cachep) |
2214 | goto fail; | |
86479a04 | 2215 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2216 | sizeof(struct btrfs_transaction), |
92fee66d | 2217 | 0, NULL); |
39279cc3 CM |
2218 | if (!btrfs_transaction_cachep) |
2219 | goto fail; | |
86479a04 | 2220 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2221 | sizeof(struct btrfs_path), |
92fee66d | 2222 | 0, NULL); |
39279cc3 CM |
2223 | if (!btrfs_path_cachep) |
2224 | goto fail; | |
86479a04 | 2225 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2226 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2227 | if (!btrfs_bit_radix_cachep) |
2228 | goto fail; | |
2229 | return 0; | |
2230 | fail: | |
2231 | btrfs_destroy_cachep(); | |
2232 | return -ENOMEM; | |
2233 | } | |
2234 | ||
2235 | static int btrfs_getattr(struct vfsmount *mnt, | |
2236 | struct dentry *dentry, struct kstat *stat) | |
2237 | { | |
2238 | struct inode *inode = dentry->d_inode; | |
2239 | generic_fillattr(inode, stat); | |
2240 | stat->blksize = 256 * 1024; | |
2241 | return 0; | |
2242 | } | |
2243 | ||
2244 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2245 | struct inode * new_dir,struct dentry *new_dentry) | |
2246 | { | |
2247 | struct btrfs_trans_handle *trans; | |
2248 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2249 | struct inode *new_inode = new_dentry->d_inode; | |
2250 | struct inode *old_inode = old_dentry->d_inode; | |
2251 | struct timespec ctime = CURRENT_TIME; | |
2252 | struct btrfs_path *path; | |
2253 | struct btrfs_dir_item *di; | |
2254 | int ret; | |
2255 | ||
2256 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2257 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2258 | return -ENOTEMPTY; | |
2259 | } | |
5f39d397 | 2260 | |
39279cc3 CM |
2261 | mutex_lock(&root->fs_info->fs_mutex); |
2262 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 2263 | |
39279cc3 CM |
2264 | btrfs_set_trans_block_group(trans, new_dir); |
2265 | path = btrfs_alloc_path(); | |
2266 | if (!path) { | |
2267 | ret = -ENOMEM; | |
2268 | goto out_fail; | |
2269 | } | |
2270 | ||
2271 | old_dentry->d_inode->i_nlink++; | |
2272 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2273 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2274 | old_inode->i_ctime = ctime; | |
5f39d397 | 2275 | |
39279cc3 CM |
2276 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { |
2277 | struct btrfs_key *location = &BTRFS_I(new_dir)->location; | |
5f39d397 | 2278 | struct btrfs_key old_parent_key; |
39279cc3 CM |
2279 | di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino, |
2280 | "..", 2, -1); | |
2281 | if (IS_ERR(di)) { | |
2282 | ret = PTR_ERR(di); | |
2283 | goto out_fail; | |
2284 | } | |
2285 | if (!di) { | |
2286 | ret = -ENOENT; | |
2287 | goto out_fail; | |
2288 | } | |
5f39d397 | 2289 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &old_parent_key); |
39279cc3 CM |
2290 | ret = btrfs_del_item(trans, root, path); |
2291 | if (ret) { | |
39279cc3 CM |
2292 | goto out_fail; |
2293 | } | |
2294 | btrfs_release_path(root, path); | |
2295 | ||
2296 | di = btrfs_lookup_dir_index_item(trans, root, path, | |
2297 | old_inode->i_ino, | |
5f39d397 | 2298 | old_parent_key.objectid, |
39279cc3 CM |
2299 | "..", 2, -1); |
2300 | if (IS_ERR(di)) { | |
2301 | ret = PTR_ERR(di); | |
2302 | goto out_fail; | |
2303 | } | |
2304 | if (!di) { | |
2305 | ret = -ENOENT; | |
2306 | goto out_fail; | |
2307 | } | |
2308 | ret = btrfs_del_item(trans, root, path); | |
2309 | if (ret) { | |
39279cc3 CM |
2310 | goto out_fail; |
2311 | } | |
2312 | btrfs_release_path(root, path); | |
2313 | ||
2314 | ret = btrfs_insert_dir_item(trans, root, "..", 2, | |
2315 | old_inode->i_ino, location, | |
2316 | BTRFS_FT_DIR); | |
2317 | if (ret) | |
2318 | goto out_fail; | |
2319 | } | |
2320 | ||
2321 | ||
2322 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); | |
2323 | if (ret) | |
2324 | goto out_fail; | |
2325 | ||
2326 | if (new_inode) { | |
2327 | new_inode->i_ctime = CURRENT_TIME; | |
2328 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2329 | if (ret) | |
2330 | goto out_fail; | |
39279cc3 CM |
2331 | } |
2332 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2333 | if (ret) | |
2334 | goto out_fail; | |
2335 | ||
2336 | out_fail: | |
2337 | btrfs_free_path(path); | |
2338 | btrfs_end_transaction(trans, root); | |
2339 | mutex_unlock(&root->fs_info->fs_mutex); | |
2340 | return ret; | |
2341 | } | |
2342 | ||
2343 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2344 | const char *symname) | |
2345 | { | |
2346 | struct btrfs_trans_handle *trans; | |
2347 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2348 | struct btrfs_path *path; | |
2349 | struct btrfs_key key; | |
2350 | struct inode *inode; | |
2351 | int err; | |
2352 | int drop_inode = 0; | |
2353 | u64 objectid; | |
2354 | int name_len; | |
2355 | int datasize; | |
5f39d397 | 2356 | unsigned long ptr; |
39279cc3 | 2357 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2358 | struct extent_buffer *leaf; |
d3c2fdcf | 2359 | unsigned long nr; |
39279cc3 CM |
2360 | |
2361 | name_len = strlen(symname) + 1; | |
2362 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2363 | return -ENAMETOOLONG; | |
2364 | mutex_lock(&root->fs_info->fs_mutex); | |
2365 | trans = btrfs_start_transaction(root, 1); | |
2366 | btrfs_set_trans_block_group(trans, dir); | |
2367 | ||
2368 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2369 | if (err) { | |
2370 | err = -ENOSPC; | |
2371 | goto out_unlock; | |
2372 | } | |
2373 | ||
2374 | inode = btrfs_new_inode(trans, root, objectid, | |
2375 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2376 | err = PTR_ERR(inode); | |
2377 | if (IS_ERR(inode)) | |
2378 | goto out_unlock; | |
2379 | ||
2380 | btrfs_set_trans_block_group(trans, inode); | |
2381 | err = btrfs_add_nondir(trans, dentry, inode); | |
2382 | if (err) | |
2383 | drop_inode = 1; | |
2384 | else { | |
2385 | inode->i_mapping->a_ops = &btrfs_aops; | |
2386 | inode->i_fop = &btrfs_file_operations; | |
2387 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2388 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2389 | inode->i_mapping, GFP_NOFS); | |
07157aac | 2390 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
2391 | } |
2392 | dir->i_sb->s_dirt = 1; | |
2393 | btrfs_update_inode_block_group(trans, inode); | |
2394 | btrfs_update_inode_block_group(trans, dir); | |
2395 | if (drop_inode) | |
2396 | goto out_unlock; | |
2397 | ||
2398 | path = btrfs_alloc_path(); | |
2399 | BUG_ON(!path); | |
2400 | key.objectid = inode->i_ino; | |
2401 | key.offset = 0; | |
39279cc3 CM |
2402 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2403 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2404 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2405 | datasize); | |
54aa1f4d CM |
2406 | if (err) { |
2407 | drop_inode = 1; | |
2408 | goto out_unlock; | |
2409 | } | |
5f39d397 CM |
2410 | leaf = path->nodes[0]; |
2411 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2412 | struct btrfs_file_extent_item); | |
2413 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2414 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2415 | BTRFS_FILE_EXTENT_INLINE); |
2416 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2417 | write_extent_buffer(leaf, symname, ptr, name_len); |
2418 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2419 | btrfs_free_path(path); |
5f39d397 | 2420 | |
39279cc3 CM |
2421 | inode->i_op = &btrfs_symlink_inode_operations; |
2422 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2423 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2424 | err = btrfs_update_inode(trans, root, inode); |
2425 | if (err) | |
2426 | drop_inode = 1; | |
39279cc3 CM |
2427 | |
2428 | out_unlock: | |
d3c2fdcf | 2429 | nr = trans->blocks_used; |
39279cc3 CM |
2430 | btrfs_end_transaction(trans, root); |
2431 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
2432 | if (drop_inode) { |
2433 | inode_dec_link_count(inode); | |
2434 | iput(inode); | |
2435 | } | |
d3c2fdcf | 2436 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2437 | return err; |
2438 | } | |
2439 | ||
2440 | static struct inode_operations btrfs_dir_inode_operations = { | |
2441 | .lookup = btrfs_lookup, | |
2442 | .create = btrfs_create, | |
2443 | .unlink = btrfs_unlink, | |
2444 | .link = btrfs_link, | |
2445 | .mkdir = btrfs_mkdir, | |
2446 | .rmdir = btrfs_rmdir, | |
2447 | .rename = btrfs_rename, | |
2448 | .symlink = btrfs_symlink, | |
2449 | .setattr = btrfs_setattr, | |
618e21d5 | 2450 | .mknod = btrfs_mknod, |
39279cc3 CM |
2451 | }; |
2452 | ||
2453 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2454 | .lookup = btrfs_lookup, | |
2455 | }; | |
2456 | ||
2457 | static struct file_operations btrfs_dir_file_operations = { | |
2458 | .llseek = generic_file_llseek, | |
2459 | .read = generic_read_dir, | |
2460 | .readdir = btrfs_readdir, | |
34287aa3 | 2461 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2462 | #ifdef CONFIG_COMPAT |
34287aa3 | 2463 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2464 | #endif |
2465 | }; | |
2466 | ||
07157aac CM |
2467 | static struct extent_map_ops btrfs_extent_map_ops = { |
2468 | .fill_delalloc = run_delalloc_range, | |
2469 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2470 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2471 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2472 | }; | |
2473 | ||
39279cc3 CM |
2474 | static struct address_space_operations btrfs_aops = { |
2475 | .readpage = btrfs_readpage, | |
2476 | .writepage = btrfs_writepage, | |
2477 | .sync_page = block_sync_page, | |
2478 | .prepare_write = btrfs_prepare_write, | |
2479 | .commit_write = btrfs_commit_write, | |
2480 | .bmap = btrfs_bmap, | |
a52d9a80 CM |
2481 | .invalidatepage = btrfs_invalidatepage, |
2482 | .releasepage = btrfs_releasepage, | |
2483 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2484 | }; |
2485 | ||
2486 | static struct address_space_operations btrfs_symlink_aops = { | |
2487 | .readpage = btrfs_readpage, | |
2488 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2489 | .invalidatepage = btrfs_invalidatepage, |
2490 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2491 | }; |
2492 | ||
2493 | static struct inode_operations btrfs_file_inode_operations = { | |
2494 | .truncate = btrfs_truncate, | |
2495 | .getattr = btrfs_getattr, | |
2496 | .setattr = btrfs_setattr, | |
2497 | }; | |
2498 | ||
618e21d5 JB |
2499 | static struct inode_operations btrfs_special_inode_operations = { |
2500 | .getattr = btrfs_getattr, | |
2501 | .setattr = btrfs_setattr, | |
2502 | }; | |
2503 | ||
39279cc3 CM |
2504 | static struct inode_operations btrfs_symlink_inode_operations = { |
2505 | .readlink = generic_readlink, | |
2506 | .follow_link = page_follow_link_light, | |
2507 | .put_link = page_put_link, | |
2508 | }; |