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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, |
3326d1b0 | 90 | start, start + num_bytes, start, &alloc_hint); |
db94535d CM |
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); | |
f578d4bd | 121 | btrfs_csum_file_block(trans, root, inode, inode->i_ino, |
07157aac CM |
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; | |
ff79f819 | 138 | u32 csum; |
07157aac CM |
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; | |
ff79f819 | 148 | csum = 0; |
07157aac CM |
149 | goto out; |
150 | } | |
ff79f819 CM |
151 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
152 | BTRFS_CRC32_SIZE); | |
153 | set_state_private(em_tree, start, csum); | |
07157aac CM |
154 | out: |
155 | if (path) | |
156 | btrfs_free_path(path); | |
157 | mutex_unlock(&root->fs_info->fs_mutex); | |
158 | return ret; | |
159 | } | |
160 | ||
161 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) | |
162 | { | |
07157aac CM |
163 | size_t offset = start - (page->index << PAGE_CACHE_SHIFT); |
164 | struct inode *inode = page->mapping->host; | |
07157aac CM |
165 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
166 | char *kaddr; | |
167 | u64 private; | |
168 | int ret; | |
ff79f819 CM |
169 | struct btrfs_root *root = BTRFS_I(inode)->root; |
170 | u32 csum = ~(u32)0; | |
bbf0d006 | 171 | unsigned long flags; |
07157aac CM |
172 | |
173 | ret = get_state_private(em_tree, start, &private); | |
bbf0d006 | 174 | local_irq_save(flags); |
07157aac CM |
175 | kaddr = kmap_atomic(page, KM_IRQ0); |
176 | if (ret) { | |
177 | goto zeroit; | |
178 | } | |
ff79f819 CM |
179 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
180 | btrfs_csum_final(csum, (char *)&csum); | |
181 | if (csum != private) { | |
07157aac CM |
182 | goto zeroit; |
183 | } | |
184 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 185 | local_irq_restore(flags); |
07157aac CM |
186 | return 0; |
187 | ||
188 | zeroit: | |
189 | printk("btrfs csum failed ino %lu off %llu\n", | |
190 | page->mapping->host->i_ino, (unsigned long long)start); | |
db94535d CM |
191 | memset(kaddr + offset, 1, end - start + 1); |
192 | flush_dcache_page(page); | |
07157aac | 193 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 194 | local_irq_restore(flags); |
07157aac CM |
195 | return 0; |
196 | } | |
b888db2b | 197 | |
39279cc3 CM |
198 | void btrfs_read_locked_inode(struct inode *inode) |
199 | { | |
200 | struct btrfs_path *path; | |
5f39d397 | 201 | struct extent_buffer *leaf; |
39279cc3 | 202 | struct btrfs_inode_item *inode_item; |
5f39d397 | 203 | struct btrfs_inode_timespec *tspec; |
39279cc3 CM |
204 | struct btrfs_root *root = BTRFS_I(inode)->root; |
205 | struct btrfs_key location; | |
206 | u64 alloc_group_block; | |
618e21d5 | 207 | u32 rdev; |
39279cc3 CM |
208 | int ret; |
209 | ||
210 | path = btrfs_alloc_path(); | |
211 | BUG_ON(!path); | |
39279cc3 CM |
212 | mutex_lock(&root->fs_info->fs_mutex); |
213 | ||
214 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); | |
215 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
5f39d397 | 216 | if (ret) |
39279cc3 | 217 | goto make_bad; |
39279cc3 | 218 | |
5f39d397 CM |
219 | leaf = path->nodes[0]; |
220 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
221 | struct btrfs_inode_item); | |
222 | ||
223 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
224 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
225 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
226 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
227 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
228 | ||
229 | tspec = btrfs_inode_atime(inode_item); | |
230 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
231 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
232 | ||
233 | tspec = btrfs_inode_mtime(inode_item); | |
234 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
235 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
236 | ||
237 | tspec = btrfs_inode_ctime(inode_item); | |
238 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
239 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
240 | ||
241 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
242 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 243 | inode->i_rdev = 0; |
5f39d397 CM |
244 | rdev = btrfs_inode_rdev(leaf, inode_item); |
245 | ||
246 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
247 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
248 | alloc_group_block); | |
249 | ||
250 | btrfs_free_path(path); | |
251 | inode_item = NULL; | |
252 | ||
253 | mutex_unlock(&root->fs_info->fs_mutex); | |
254 | ||
255 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
256 | case S_IFREG: |
257 | inode->i_mapping->a_ops = &btrfs_aops; | |
07157aac | 258 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
259 | inode->i_fop = &btrfs_file_operations; |
260 | inode->i_op = &btrfs_file_inode_operations; | |
261 | break; | |
262 | case S_IFDIR: | |
263 | inode->i_fop = &btrfs_dir_file_operations; | |
264 | if (root == root->fs_info->tree_root) | |
265 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
266 | else | |
267 | inode->i_op = &btrfs_dir_inode_operations; | |
268 | break; | |
269 | case S_IFLNK: | |
270 | inode->i_op = &btrfs_symlink_inode_operations; | |
271 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
272 | break; | |
618e21d5 JB |
273 | default: |
274 | init_special_inode(inode, inode->i_mode, rdev); | |
275 | break; | |
39279cc3 CM |
276 | } |
277 | return; | |
278 | ||
279 | make_bad: | |
280 | btrfs_release_path(root, path); | |
281 | btrfs_free_path(path); | |
282 | mutex_unlock(&root->fs_info->fs_mutex); | |
283 | make_bad_inode(inode); | |
284 | } | |
285 | ||
5f39d397 CM |
286 | static void fill_inode_item(struct extent_buffer *leaf, |
287 | struct btrfs_inode_item *item, | |
39279cc3 CM |
288 | struct inode *inode) |
289 | { | |
5f39d397 CM |
290 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
291 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
292 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
293 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
294 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
295 | ||
296 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
297 | inode->i_atime.tv_sec); | |
298 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
299 | inode->i_atime.tv_nsec); | |
300 | ||
301 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
302 | inode->i_mtime.tv_sec); | |
303 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
304 | inode->i_mtime.tv_nsec); | |
305 | ||
306 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
307 | inode->i_ctime.tv_sec); | |
308 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
309 | inode->i_ctime.tv_nsec); | |
310 | ||
311 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
312 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
313 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
314 | btrfs_set_inode_block_group(leaf, item, | |
39279cc3 CM |
315 | BTRFS_I(inode)->block_group->key.objectid); |
316 | } | |
317 | ||
a52d9a80 | 318 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
319 | struct btrfs_root *root, |
320 | struct inode *inode) | |
321 | { | |
322 | struct btrfs_inode_item *inode_item; | |
323 | struct btrfs_path *path; | |
5f39d397 | 324 | struct extent_buffer *leaf; |
39279cc3 CM |
325 | int ret; |
326 | ||
327 | path = btrfs_alloc_path(); | |
328 | BUG_ON(!path); | |
39279cc3 CM |
329 | ret = btrfs_lookup_inode(trans, root, path, |
330 | &BTRFS_I(inode)->location, 1); | |
331 | if (ret) { | |
332 | if (ret > 0) | |
333 | ret = -ENOENT; | |
334 | goto failed; | |
335 | } | |
336 | ||
5f39d397 CM |
337 | leaf = path->nodes[0]; |
338 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
339 | struct btrfs_inode_item); |
340 | ||
5f39d397 CM |
341 | fill_inode_item(leaf, inode_item, inode); |
342 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 343 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
344 | ret = 0; |
345 | failed: | |
346 | btrfs_release_path(root, path); | |
347 | btrfs_free_path(path); | |
348 | return ret; | |
349 | } | |
350 | ||
351 | ||
352 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
353 | struct btrfs_root *root, | |
354 | struct inode *dir, | |
355 | struct dentry *dentry) | |
356 | { | |
357 | struct btrfs_path *path; | |
358 | const char *name = dentry->d_name.name; | |
359 | int name_len = dentry->d_name.len; | |
360 | int ret = 0; | |
5f39d397 | 361 | struct extent_buffer *leaf; |
39279cc3 | 362 | struct btrfs_dir_item *di; |
5f39d397 | 363 | struct btrfs_key key; |
39279cc3 CM |
364 | |
365 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
366 | if (!path) { |
367 | ret = -ENOMEM; | |
368 | goto err; | |
369 | } | |
370 | ||
39279cc3 CM |
371 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
372 | name, name_len, -1); | |
373 | if (IS_ERR(di)) { | |
374 | ret = PTR_ERR(di); | |
375 | goto err; | |
376 | } | |
377 | if (!di) { | |
378 | ret = -ENOENT; | |
379 | goto err; | |
380 | } | |
5f39d397 CM |
381 | leaf = path->nodes[0]; |
382 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 383 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
384 | if (ret) |
385 | goto err; | |
39279cc3 CM |
386 | btrfs_release_path(root, path); |
387 | ||
388 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 389 | key.objectid, name, name_len, -1); |
39279cc3 CM |
390 | if (IS_ERR(di)) { |
391 | ret = PTR_ERR(di); | |
392 | goto err; | |
393 | } | |
394 | if (!di) { | |
395 | ret = -ENOENT; | |
396 | goto err; | |
397 | } | |
398 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
399 | |
400 | dentry->d_inode->i_ctime = dir->i_ctime; | |
401 | err: | |
402 | btrfs_free_path(path); | |
403 | if (!ret) { | |
404 | dir->i_size -= name_len * 2; | |
79c44584 | 405 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 CM |
406 | btrfs_update_inode(trans, root, dir); |
407 | drop_nlink(dentry->d_inode); | |
54aa1f4d | 408 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
409 | dir->i_sb->s_dirt = 1; |
410 | } | |
411 | return ret; | |
412 | } | |
413 | ||
414 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
415 | { | |
416 | struct btrfs_root *root; | |
417 | struct btrfs_trans_handle *trans; | |
418 | int ret; | |
d3c2fdcf | 419 | unsigned long nr; |
39279cc3 CM |
420 | |
421 | root = BTRFS_I(dir)->root; | |
422 | mutex_lock(&root->fs_info->fs_mutex); | |
423 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 424 | |
39279cc3 CM |
425 | btrfs_set_trans_block_group(trans, dir); |
426 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 427 | nr = trans->blocks_used; |
5f39d397 | 428 | |
39279cc3 CM |
429 | btrfs_end_transaction(trans, root); |
430 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 431 | btrfs_btree_balance_dirty(root, nr); |
5f39d397 | 432 | |
39279cc3 CM |
433 | return ret; |
434 | } | |
435 | ||
436 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
437 | { | |
438 | struct inode *inode = dentry->d_inode; | |
439 | int err; | |
440 | int ret; | |
441 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
442 | struct btrfs_path *path; | |
443 | struct btrfs_key key; | |
444 | struct btrfs_trans_handle *trans; | |
445 | struct btrfs_key found_key; | |
446 | int found_type; | |
5f39d397 | 447 | struct extent_buffer *leaf; |
39279cc3 | 448 | char *goodnames = ".."; |
d3c2fdcf | 449 | unsigned long nr; |
39279cc3 CM |
450 | |
451 | path = btrfs_alloc_path(); | |
452 | BUG_ON(!path); | |
39279cc3 CM |
453 | mutex_lock(&root->fs_info->fs_mutex); |
454 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 455 | |
39279cc3 CM |
456 | btrfs_set_trans_block_group(trans, dir); |
457 | key.objectid = inode->i_ino; | |
458 | key.offset = (u64)-1; | |
5f39d397 | 459 | key.type = (u8)-1; |
39279cc3 CM |
460 | while(1) { |
461 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
462 | if (ret < 0) { | |
463 | err = ret; | |
464 | goto out; | |
465 | } | |
466 | BUG_ON(ret == 0); | |
467 | if (path->slots[0] == 0) { | |
468 | err = -ENOENT; | |
469 | goto out; | |
470 | } | |
471 | path->slots[0]--; | |
5f39d397 CM |
472 | leaf = path->nodes[0]; |
473 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
39279cc3 CM |
474 | found_type = btrfs_key_type(&found_key); |
475 | if (found_key.objectid != inode->i_ino) { | |
476 | err = -ENOENT; | |
477 | goto out; | |
478 | } | |
479 | if ((found_type != BTRFS_DIR_ITEM_KEY && | |
480 | found_type != BTRFS_DIR_INDEX_KEY) || | |
481 | (!btrfs_match_dir_item_name(root, path, goodnames, 2) && | |
482 | !btrfs_match_dir_item_name(root, path, goodnames, 1))) { | |
483 | err = -ENOTEMPTY; | |
484 | goto out; | |
485 | } | |
486 | ret = btrfs_del_item(trans, root, path); | |
487 | BUG_ON(ret); | |
488 | ||
489 | if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1) | |
490 | break; | |
491 | btrfs_release_path(root, path); | |
492 | } | |
493 | ret = 0; | |
494 | btrfs_release_path(root, path); | |
495 | ||
496 | /* now the directory is empty */ | |
497 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
498 | if (!err) { | |
499 | inode->i_size = 0; | |
500 | } | |
501 | out: | |
502 | btrfs_release_path(root, path); | |
503 | btrfs_free_path(path); | |
504 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 505 | nr = trans->blocks_used; |
39279cc3 | 506 | ret = btrfs_end_transaction(trans, root); |
d3c2fdcf | 507 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
508 | if (ret && !err) |
509 | err = ret; | |
510 | return err; | |
511 | } | |
512 | ||
513 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
514 | struct btrfs_root *root, | |
515 | struct inode *inode) | |
516 | { | |
517 | struct btrfs_path *path; | |
518 | int ret; | |
519 | ||
520 | clear_inode(inode); | |
521 | ||
522 | path = btrfs_alloc_path(); | |
523 | BUG_ON(!path); | |
39279cc3 CM |
524 | ret = btrfs_lookup_inode(trans, root, path, |
525 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
526 | if (ret > 0) |
527 | ret = -ENOENT; | |
528 | if (!ret) | |
529 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
530 | btrfs_free_path(path); |
531 | return ret; | |
532 | } | |
533 | ||
39279cc3 CM |
534 | /* |
535 | * this can truncate away extent items, csum items and directory items. | |
536 | * It starts at a high offset and removes keys until it can't find | |
537 | * any higher than i_size. | |
538 | * | |
539 | * csum items that cross the new i_size are truncated to the new size | |
540 | * as well. | |
541 | */ | |
542 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
543 | struct btrfs_root *root, | |
544 | struct inode *inode) | |
545 | { | |
546 | int ret; | |
547 | struct btrfs_path *path; | |
548 | struct btrfs_key key; | |
5f39d397 | 549 | struct btrfs_key found_key; |
39279cc3 | 550 | u32 found_type; |
5f39d397 | 551 | struct extent_buffer *leaf; |
39279cc3 CM |
552 | struct btrfs_file_extent_item *fi; |
553 | u64 extent_start = 0; | |
db94535d | 554 | u64 extent_num_bytes = 0; |
39279cc3 CM |
555 | u64 item_end = 0; |
556 | int found_extent; | |
557 | int del_item; | |
558 | ||
a52d9a80 | 559 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 560 | path = btrfs_alloc_path(); |
3c69faec | 561 | path->reada = -1; |
39279cc3 | 562 | BUG_ON(!path); |
5f39d397 | 563 | |
39279cc3 CM |
564 | /* FIXME, add redo link to tree so we don't leak on crash */ |
565 | key.objectid = inode->i_ino; | |
566 | key.offset = (u64)-1; | |
5f39d397 CM |
567 | key.type = (u8)-1; |
568 | ||
39279cc3 CM |
569 | while(1) { |
570 | btrfs_init_path(path); | |
571 | fi = NULL; | |
572 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
573 | if (ret < 0) { | |
574 | goto error; | |
575 | } | |
576 | if (ret > 0) { | |
577 | BUG_ON(path->slots[0] == 0); | |
578 | path->slots[0]--; | |
579 | } | |
5f39d397 CM |
580 | leaf = path->nodes[0]; |
581 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
582 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 583 | |
5f39d397 | 584 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 585 | break; |
5f39d397 | 586 | |
39279cc3 CM |
587 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
588 | found_type != BTRFS_DIR_ITEM_KEY && | |
589 | found_type != BTRFS_DIR_INDEX_KEY && | |
590 | found_type != BTRFS_EXTENT_DATA_KEY) | |
591 | break; | |
592 | ||
5f39d397 | 593 | item_end = found_key.offset; |
39279cc3 | 594 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 595 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 596 | struct btrfs_file_extent_item); |
5f39d397 | 597 | if (btrfs_file_extent_type(leaf, fi) != |
39279cc3 | 598 | BTRFS_FILE_EXTENT_INLINE) { |
5f39d397 | 599 | item_end += |
db94535d | 600 | btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
601 | } |
602 | } | |
603 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
604 | ret = btrfs_csum_truncate(trans, root, path, | |
605 | inode->i_size); | |
606 | BUG_ON(ret); | |
607 | } | |
608 | if (item_end < inode->i_size) { | |
b888db2b CM |
609 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
610 | found_type = BTRFS_INODE_ITEM_KEY; | |
611 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
612 | found_type = BTRFS_CSUM_ITEM_KEY; | |
613 | } else if (found_type) { | |
614 | found_type--; | |
615 | } else { | |
616 | break; | |
39279cc3 | 617 | } |
a61721d5 | 618 | btrfs_set_key_type(&key, found_type); |
65555a06 | 619 | btrfs_release_path(root, path); |
b888db2b | 620 | continue; |
39279cc3 | 621 | } |
5f39d397 | 622 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
623 | del_item = 1; |
624 | else | |
625 | del_item = 0; | |
626 | found_extent = 0; | |
627 | ||
628 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
629 | if (found_type == BTRFS_EXTENT_DATA_KEY && | |
5f39d397 | 630 | btrfs_file_extent_type(leaf, fi) != |
39279cc3 CM |
631 | BTRFS_FILE_EXTENT_INLINE) { |
632 | u64 num_dec; | |
db94535d | 633 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 634 | if (!del_item) { |
db94535d CM |
635 | u64 orig_num_bytes = |
636 | btrfs_file_extent_num_bytes(leaf, fi); | |
637 | extent_num_bytes = inode->i_size - | |
5f39d397 | 638 | found_key.offset + root->sectorsize - 1; |
db94535d CM |
639 | btrfs_set_file_extent_num_bytes(leaf, fi, |
640 | extent_num_bytes); | |
641 | num_dec = (orig_num_bytes - | |
642 | extent_num_bytes) >> 9; | |
bab9fb03 Y |
643 | if (extent_start != 0) { |
644 | inode->i_blocks -= num_dec; | |
645 | } | |
5f39d397 | 646 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 647 | } else { |
db94535d CM |
648 | extent_num_bytes = |
649 | btrfs_file_extent_disk_num_bytes(leaf, | |
650 | fi); | |
39279cc3 | 651 | /* FIXME blocksize != 4096 */ |
db94535d CM |
652 | num_dec = btrfs_file_extent_num_bytes(leaf, |
653 | fi) >> 9; | |
39279cc3 CM |
654 | if (extent_start != 0) { |
655 | found_extent = 1; | |
656 | inode->i_blocks -= num_dec; | |
657 | } | |
658 | } | |
659 | } | |
660 | if (del_item) { | |
661 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
662 | if (ret) |
663 | goto error; | |
39279cc3 CM |
664 | } else { |
665 | break; | |
666 | } | |
667 | btrfs_release_path(root, path); | |
668 | if (found_extent) { | |
669 | ret = btrfs_free_extent(trans, root, extent_start, | |
db94535d | 670 | extent_num_bytes, 0); |
39279cc3 CM |
671 | BUG_ON(ret); |
672 | } | |
673 | } | |
674 | ret = 0; | |
675 | error: | |
676 | btrfs_release_path(root, path); | |
677 | btrfs_free_path(path); | |
678 | inode->i_sb->s_dirt = 1; | |
679 | return ret; | |
680 | } | |
681 | ||
b888db2b | 682 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
683 | size_t zero_start) |
684 | { | |
685 | char *kaddr; | |
686 | int ret = 0; | |
b888db2b | 687 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
a52d9a80 | 688 | u64 page_start = page->index << PAGE_CACHE_SHIFT; |
b888db2b | 689 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
a52d9a80 | 690 | |
b3cfa35a | 691 | set_page_extent_mapped(page); |
a52d9a80 | 692 | |
b888db2b CM |
693 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
694 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, | |
695 | page_end, GFP_NOFS); | |
a52d9a80 | 696 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 697 | kaddr = kmap(page); |
a52d9a80 CM |
698 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
699 | flush_dcache_page(page); | |
b888db2b | 700 | kunmap(page); |
a52d9a80 | 701 | } |
b888db2b CM |
702 | set_page_dirty(page); |
703 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 704 | |
a52d9a80 CM |
705 | return ret; |
706 | } | |
707 | ||
39279cc3 CM |
708 | /* |
709 | * taken from block_truncate_page, but does cow as it zeros out | |
710 | * any bytes left in the last page in the file. | |
711 | */ | |
712 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
713 | { | |
714 | struct inode *inode = mapping->host; | |
db94535d CM |
715 | struct btrfs_root *root = BTRFS_I(inode)->root; |
716 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
717 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
718 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
719 | struct page *page; | |
39279cc3 | 720 | int ret = 0; |
a52d9a80 | 721 | u64 page_start; |
39279cc3 CM |
722 | |
723 | if ((offset & (blocksize - 1)) == 0) | |
724 | goto out; | |
725 | ||
db94535d | 726 | down_read(&root->snap_sem); |
39279cc3 CM |
727 | ret = -ENOMEM; |
728 | page = grab_cache_page(mapping, index); | |
729 | if (!page) | |
730 | goto out; | |
39279cc3 | 731 | if (!PageUptodate(page)) { |
9ebefb18 | 732 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
733 | lock_page(page); |
734 | if (!PageUptodate(page)) { | |
735 | ret = -EIO; | |
736 | goto out; | |
737 | } | |
738 | } | |
a52d9a80 CM |
739 | page_start = page->index << PAGE_CACHE_SHIFT; |
740 | ||
b888db2b | 741 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 742 | |
39279cc3 CM |
743 | unlock_page(page); |
744 | page_cache_release(page); | |
011410bd | 745 | up_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
746 | out: |
747 | return ret; | |
748 | } | |
749 | ||
750 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
751 | { | |
752 | struct inode *inode = dentry->d_inode; | |
753 | int err; | |
754 | ||
755 | err = inode_change_ok(inode, attr); | |
756 | if (err) | |
757 | return err; | |
758 | ||
759 | if (S_ISREG(inode->i_mode) && | |
760 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
761 | struct btrfs_trans_handle *trans; | |
762 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2bf5a725 CM |
763 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
764 | ||
5f39d397 | 765 | u64 mask = root->sectorsize - 1; |
39279cc3 | 766 | u64 pos = (inode->i_size + mask) & ~mask; |
2bf5a725 | 767 | u64 block_end = attr->ia_size | mask; |
39279cc3 | 768 | u64 hole_size; |
2bf5a725 | 769 | u64 alloc_hint; |
39279cc3 CM |
770 | |
771 | if (attr->ia_size <= pos) | |
772 | goto out; | |
773 | ||
774 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
775 | ||
2bf5a725 | 776 | lock_extent(em_tree, pos, block_end, GFP_NOFS); |
39279cc3 | 777 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
39279cc3 CM |
778 | |
779 | mutex_lock(&root->fs_info->fs_mutex); | |
780 | trans = btrfs_start_transaction(root, 1); | |
781 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 782 | err = btrfs_drop_extents(trans, root, inode, |
3326d1b0 CM |
783 | pos, pos + hole_size, pos, |
784 | &alloc_hint); | |
2bf5a725 | 785 | |
39279cc3 CM |
786 | err = btrfs_insert_file_extent(trans, root, inode->i_ino, |
787 | pos, 0, 0, hole_size); | |
39279cc3 CM |
788 | btrfs_end_transaction(trans, root); |
789 | mutex_unlock(&root->fs_info->fs_mutex); | |
2bf5a725 | 790 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
791 | if (err) |
792 | return err; | |
39279cc3 CM |
793 | } |
794 | out: | |
795 | err = inode_setattr(inode, attr); | |
796 | ||
797 | return err; | |
798 | } | |
799 | void btrfs_delete_inode(struct inode *inode) | |
800 | { | |
801 | struct btrfs_trans_handle *trans; | |
802 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 803 | unsigned long nr; |
39279cc3 CM |
804 | int ret; |
805 | ||
806 | truncate_inode_pages(&inode->i_data, 0); | |
807 | if (is_bad_inode(inode)) { | |
808 | goto no_delete; | |
809 | } | |
5f39d397 | 810 | |
39279cc3 CM |
811 | inode->i_size = 0; |
812 | mutex_lock(&root->fs_info->fs_mutex); | |
813 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 814 | |
39279cc3 CM |
815 | btrfs_set_trans_block_group(trans, inode); |
816 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
54aa1f4d CM |
817 | if (ret) |
818 | goto no_delete_lock; | |
819 | ret = btrfs_free_inode(trans, root, inode); | |
820 | if (ret) | |
821 | goto no_delete_lock; | |
d3c2fdcf | 822 | nr = trans->blocks_used; |
5f39d397 | 823 | |
39279cc3 CM |
824 | btrfs_end_transaction(trans, root); |
825 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 826 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 827 | return; |
54aa1f4d CM |
828 | |
829 | no_delete_lock: | |
d3c2fdcf | 830 | nr = trans->blocks_used; |
54aa1f4d CM |
831 | btrfs_end_transaction(trans, root); |
832 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 833 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
834 | no_delete: |
835 | clear_inode(inode); | |
836 | } | |
837 | ||
838 | /* | |
839 | * this returns the key found in the dir entry in the location pointer. | |
840 | * If no dir entries were found, location->objectid is 0. | |
841 | */ | |
842 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
843 | struct btrfs_key *location) | |
844 | { | |
845 | const char *name = dentry->d_name.name; | |
846 | int namelen = dentry->d_name.len; | |
847 | struct btrfs_dir_item *di; | |
848 | struct btrfs_path *path; | |
849 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 850 | int ret = 0; |
39279cc3 CM |
851 | |
852 | path = btrfs_alloc_path(); | |
853 | BUG_ON(!path); | |
39279cc3 CM |
854 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
855 | namelen, 0); | |
0d9f7f3e Y |
856 | if (IS_ERR(di)) |
857 | ret = PTR_ERR(di); | |
39279cc3 CM |
858 | if (!di || IS_ERR(di)) { |
859 | location->objectid = 0; | |
39279cc3 CM |
860 | goto out; |
861 | } | |
5f39d397 | 862 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 CM |
863 | out: |
864 | btrfs_release_path(root, path); | |
865 | btrfs_free_path(path); | |
866 | return ret; | |
867 | } | |
868 | ||
869 | /* | |
870 | * when we hit a tree root in a directory, the btrfs part of the inode | |
871 | * needs to be changed to reflect the root directory of the tree root. This | |
872 | * is kind of like crossing a mount point. | |
873 | */ | |
874 | static int fixup_tree_root_location(struct btrfs_root *root, | |
875 | struct btrfs_key *location, | |
58176a96 JB |
876 | struct btrfs_root **sub_root, |
877 | struct dentry *dentry) | |
39279cc3 CM |
878 | { |
879 | struct btrfs_path *path; | |
880 | struct btrfs_root_item *ri; | |
881 | ||
882 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
883 | return 0; | |
884 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
885 | return 0; | |
886 | ||
887 | path = btrfs_alloc_path(); | |
888 | BUG_ON(!path); | |
889 | mutex_lock(&root->fs_info->fs_mutex); | |
890 | ||
58176a96 JB |
891 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
892 | dentry->d_name.name, | |
893 | dentry->d_name.len); | |
39279cc3 CM |
894 | if (IS_ERR(*sub_root)) |
895 | return PTR_ERR(*sub_root); | |
896 | ||
897 | ri = &(*sub_root)->root_item; | |
898 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
899 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
900 | location->offset = 0; | |
901 | ||
902 | btrfs_free_path(path); | |
903 | mutex_unlock(&root->fs_info->fs_mutex); | |
904 | return 0; | |
905 | } | |
906 | ||
907 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
908 | { | |
909 | struct btrfs_iget_args *args = p; | |
910 | inode->i_ino = args->ino; | |
911 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
912 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
913 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
914 | return 0; |
915 | } | |
916 | ||
917 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
918 | { | |
919 | struct btrfs_iget_args *args = opaque; | |
920 | return (args->ino == inode->i_ino && | |
921 | args->root == BTRFS_I(inode)->root); | |
922 | } | |
923 | ||
924 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
925 | struct btrfs_root *root) | |
926 | { | |
927 | struct inode *inode; | |
928 | struct btrfs_iget_args args; | |
929 | args.ino = objectid; | |
930 | args.root = root; | |
931 | ||
932 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
933 | btrfs_init_locked_inode, | |
934 | (void *)&args); | |
935 | return inode; | |
936 | } | |
937 | ||
938 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
939 | struct nameidata *nd) | |
940 | { | |
941 | struct inode * inode; | |
942 | struct btrfs_inode *bi = BTRFS_I(dir); | |
943 | struct btrfs_root *root = bi->root; | |
944 | struct btrfs_root *sub_root = root; | |
945 | struct btrfs_key location; | |
946 | int ret; | |
947 | ||
948 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
949 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 950 | |
39279cc3 CM |
951 | mutex_lock(&root->fs_info->fs_mutex); |
952 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
953 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 954 | |
39279cc3 CM |
955 | if (ret < 0) |
956 | return ERR_PTR(ret); | |
5f39d397 | 957 | |
39279cc3 CM |
958 | inode = NULL; |
959 | if (location.objectid) { | |
58176a96 JB |
960 | ret = fixup_tree_root_location(root, &location, &sub_root, |
961 | dentry); | |
39279cc3 CM |
962 | if (ret < 0) |
963 | return ERR_PTR(ret); | |
964 | if (ret > 0) | |
965 | return ERR_PTR(-ENOENT); | |
966 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
967 | sub_root); | |
968 | if (!inode) | |
969 | return ERR_PTR(-EACCES); | |
970 | if (inode->i_state & I_NEW) { | |
971 | /* the inode and parent dir are two different roots */ | |
972 | if (sub_root != root) { | |
973 | igrab(inode); | |
974 | sub_root->inode = inode; | |
975 | } | |
976 | BTRFS_I(inode)->root = sub_root; | |
977 | memcpy(&BTRFS_I(inode)->location, &location, | |
978 | sizeof(location)); | |
979 | btrfs_read_locked_inode(inode); | |
980 | unlock_new_inode(inode); | |
981 | } | |
982 | } | |
983 | return d_splice_alias(inode, dentry); | |
984 | } | |
985 | ||
39279cc3 CM |
986 | static unsigned char btrfs_filetype_table[] = { |
987 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
988 | }; | |
989 | ||
990 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
991 | { | |
992 | struct inode *inode = filp->f_path.dentry->d_inode; | |
993 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
994 | struct btrfs_item *item; | |
995 | struct btrfs_dir_item *di; | |
996 | struct btrfs_key key; | |
5f39d397 | 997 | struct btrfs_key found_key; |
39279cc3 CM |
998 | struct btrfs_path *path; |
999 | int ret; | |
1000 | u32 nritems; | |
5f39d397 | 1001 | struct extent_buffer *leaf; |
39279cc3 CM |
1002 | int slot; |
1003 | int advance; | |
1004 | unsigned char d_type; | |
1005 | int over = 0; | |
1006 | u32 di_cur; | |
1007 | u32 di_total; | |
1008 | u32 di_len; | |
1009 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1010 | char tmp_name[32]; |
1011 | char *name_ptr; | |
1012 | int name_len; | |
39279cc3 CM |
1013 | |
1014 | /* FIXME, use a real flag for deciding about the key type */ | |
1015 | if (root->fs_info->tree_root == root) | |
1016 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1017 | |
39279cc3 CM |
1018 | mutex_lock(&root->fs_info->fs_mutex); |
1019 | key.objectid = inode->i_ino; | |
39279cc3 CM |
1020 | btrfs_set_key_type(&key, key_type); |
1021 | key.offset = filp->f_pos; | |
5f39d397 | 1022 | |
39279cc3 | 1023 | path = btrfs_alloc_path(); |
2cc58cf2 | 1024 | path->reada = 2; |
39279cc3 CM |
1025 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1026 | if (ret < 0) | |
1027 | goto err; | |
1028 | advance = 0; | |
39279cc3 | 1029 | while(1) { |
5f39d397 CM |
1030 | leaf = path->nodes[0]; |
1031 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1032 | slot = path->slots[0]; |
1033 | if (advance || slot >= nritems) { | |
1034 | if (slot >= nritems -1) { | |
39279cc3 CM |
1035 | ret = btrfs_next_leaf(root, path); |
1036 | if (ret) | |
1037 | break; | |
5f39d397 CM |
1038 | leaf = path->nodes[0]; |
1039 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1040 | slot = path->slots[0]; |
1041 | } else { | |
1042 | slot++; | |
1043 | path->slots[0]++; | |
1044 | } | |
1045 | } | |
1046 | advance = 1; | |
5f39d397 CM |
1047 | item = btrfs_item_nr(leaf, slot); |
1048 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1049 | ||
1050 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1051 | break; |
5f39d397 | 1052 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1053 | break; |
5f39d397 | 1054 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1055 | continue; |
5f39d397 CM |
1056 | |
1057 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1058 | advance = 1; |
1059 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1060 | di_cur = 0; | |
5f39d397 | 1061 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1062 | while(di_cur < di_total) { |
5f39d397 CM |
1063 | struct btrfs_key location; |
1064 | ||
1065 | name_len = btrfs_dir_name_len(leaf, di); | |
1066 | if (name_len < 32) { | |
1067 | name_ptr = tmp_name; | |
1068 | } else { | |
1069 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1070 | BUG_ON(!name_ptr); | |
1071 | } | |
1072 | read_extent_buffer(leaf, name_ptr, | |
1073 | (unsigned long)(di + 1), name_len); | |
1074 | ||
1075 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1076 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
1077 | ||
1078 | over = filldir(dirent, name_ptr, name_len, | |
1079 | found_key.offset, | |
1080 | location.objectid, | |
39279cc3 | 1081 | d_type); |
5f39d397 CM |
1082 | |
1083 | if (name_ptr != tmp_name) | |
1084 | kfree(name_ptr); | |
1085 | ||
39279cc3 CM |
1086 | if (over) |
1087 | goto nopos; | |
5f39d397 | 1088 | di_len = btrfs_dir_name_len(leaf, di) + sizeof(*di); |
39279cc3 CM |
1089 | di_cur += di_len; |
1090 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1091 | } | |
1092 | } | |
1093 | filp->f_pos++; | |
1094 | nopos: | |
1095 | ret = 0; | |
1096 | err: | |
1097 | btrfs_release_path(root, path); | |
1098 | btrfs_free_path(path); | |
1099 | mutex_unlock(&root->fs_info->fs_mutex); | |
1100 | return ret; | |
1101 | } | |
1102 | ||
1103 | int btrfs_write_inode(struct inode *inode, int wait) | |
1104 | { | |
1105 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1106 | struct btrfs_trans_handle *trans; | |
1107 | int ret = 0; | |
1108 | ||
1109 | if (wait) { | |
1110 | mutex_lock(&root->fs_info->fs_mutex); | |
1111 | trans = btrfs_start_transaction(root, 1); | |
1112 | btrfs_set_trans_block_group(trans, inode); | |
1113 | ret = btrfs_commit_transaction(trans, root); | |
1114 | mutex_unlock(&root->fs_info->fs_mutex); | |
1115 | } | |
1116 | return ret; | |
1117 | } | |
1118 | ||
1119 | /* | |
54aa1f4d | 1120 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1121 | * inode changes. But, it is most likely to find the inode in cache. |
1122 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1123 | * to keep or drop this code. | |
1124 | */ | |
1125 | void btrfs_dirty_inode(struct inode *inode) | |
1126 | { | |
1127 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1128 | struct btrfs_trans_handle *trans; | |
1129 | ||
1130 | mutex_lock(&root->fs_info->fs_mutex); | |
1131 | trans = btrfs_start_transaction(root, 1); | |
1132 | btrfs_set_trans_block_group(trans, inode); | |
1133 | btrfs_update_inode(trans, root, inode); | |
1134 | btrfs_end_transaction(trans, root); | |
1135 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1136 | } |
1137 | ||
1138 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1139 | struct btrfs_root *root, | |
1140 | u64 objectid, | |
1141 | struct btrfs_block_group_cache *group, | |
1142 | int mode) | |
1143 | { | |
1144 | struct inode *inode; | |
5f39d397 | 1145 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1146 | struct btrfs_key *location; |
5f39d397 | 1147 | struct btrfs_path *path; |
39279cc3 CM |
1148 | int ret; |
1149 | int owner; | |
1150 | ||
5f39d397 CM |
1151 | path = btrfs_alloc_path(); |
1152 | BUG_ON(!path); | |
1153 | ||
39279cc3 CM |
1154 | inode = new_inode(root->fs_info->sb); |
1155 | if (!inode) | |
1156 | return ERR_PTR(-ENOMEM); | |
1157 | ||
b888db2b CM |
1158 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1159 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 1160 | BTRFS_I(inode)->root = root; |
b888db2b | 1161 | |
39279cc3 CM |
1162 | if (mode & S_IFDIR) |
1163 | owner = 0; | |
1164 | else | |
1165 | owner = 1; | |
1166 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1167 | BTRFS_I(inode)->block_group = group; | |
1168 | ||
5f39d397 CM |
1169 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
1170 | if (ret) | |
1171 | goto fail; | |
1172 | ||
39279cc3 CM |
1173 | inode->i_uid = current->fsuid; |
1174 | inode->i_gid = current->fsgid; | |
1175 | inode->i_mode = mode; | |
1176 | inode->i_ino = objectid; | |
1177 | inode->i_blocks = 0; | |
1178 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1179 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1180 | struct btrfs_inode_item); | |
1181 | fill_inode_item(path->nodes[0], inode_item, inode); | |
1182 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1183 | btrfs_free_path(path); | |
1184 | ||
39279cc3 CM |
1185 | location = &BTRFS_I(inode)->location; |
1186 | location->objectid = objectid; | |
39279cc3 CM |
1187 | location->offset = 0; |
1188 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1189 | ||
39279cc3 CM |
1190 | insert_inode_hash(inode); |
1191 | return inode; | |
5f39d397 CM |
1192 | fail: |
1193 | btrfs_free_path(path); | |
1194 | return ERR_PTR(ret); | |
39279cc3 CM |
1195 | } |
1196 | ||
1197 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1198 | { | |
1199 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1200 | } | |
1201 | ||
1202 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1203 | struct dentry *dentry, struct inode *inode) | |
1204 | { | |
1205 | int ret; | |
1206 | struct btrfs_key key; | |
1207 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1208 | struct inode *parent_inode; |
5f39d397 | 1209 | |
39279cc3 | 1210 | key.objectid = inode->i_ino; |
39279cc3 CM |
1211 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1212 | key.offset = 0; | |
1213 | ||
1214 | ret = btrfs_insert_dir_item(trans, root, | |
1215 | dentry->d_name.name, dentry->d_name.len, | |
1216 | dentry->d_parent->d_inode->i_ino, | |
1217 | &key, btrfs_inode_type(inode)); | |
1218 | if (ret == 0) { | |
79c44584 CM |
1219 | parent_inode = dentry->d_parent->d_inode; |
1220 | parent_inode->i_size += dentry->d_name.len * 2; | |
1221 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1222 | ret = btrfs_update_inode(trans, root, |
1223 | dentry->d_parent->d_inode); | |
1224 | } | |
1225 | return ret; | |
1226 | } | |
1227 | ||
1228 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1229 | struct dentry *dentry, struct inode *inode) | |
1230 | { | |
1231 | int err = btrfs_add_link(trans, dentry, inode); | |
1232 | if (!err) { | |
1233 | d_instantiate(dentry, inode); | |
1234 | return 0; | |
1235 | } | |
1236 | if (err > 0) | |
1237 | err = -EEXIST; | |
1238 | return err; | |
1239 | } | |
1240 | ||
618e21d5 JB |
1241 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1242 | int mode, dev_t rdev) | |
1243 | { | |
1244 | struct btrfs_trans_handle *trans; | |
1245 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1246 | struct inode *inode; | |
1247 | int err; | |
1248 | int drop_inode = 0; | |
1249 | u64 objectid; | |
d3c2fdcf | 1250 | unsigned long nr; |
618e21d5 JB |
1251 | |
1252 | if (!new_valid_dev(rdev)) | |
1253 | return -EINVAL; | |
1254 | ||
1255 | mutex_lock(&root->fs_info->fs_mutex); | |
1256 | trans = btrfs_start_transaction(root, 1); | |
1257 | btrfs_set_trans_block_group(trans, dir); | |
1258 | ||
1259 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1260 | if (err) { | |
1261 | err = -ENOSPC; | |
1262 | goto out_unlock; | |
1263 | } | |
1264 | ||
1265 | inode = btrfs_new_inode(trans, root, objectid, | |
1266 | BTRFS_I(dir)->block_group, mode); | |
1267 | err = PTR_ERR(inode); | |
1268 | if (IS_ERR(inode)) | |
1269 | goto out_unlock; | |
1270 | ||
1271 | btrfs_set_trans_block_group(trans, inode); | |
1272 | err = btrfs_add_nondir(trans, dentry, inode); | |
1273 | if (err) | |
1274 | drop_inode = 1; | |
1275 | else { | |
1276 | inode->i_op = &btrfs_special_inode_operations; | |
1277 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1278 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1279 | } |
1280 | dir->i_sb->s_dirt = 1; | |
1281 | btrfs_update_inode_block_group(trans, inode); | |
1282 | btrfs_update_inode_block_group(trans, dir); | |
1283 | out_unlock: | |
d3c2fdcf | 1284 | nr = trans->blocks_used; |
618e21d5 JB |
1285 | btrfs_end_transaction(trans, root); |
1286 | mutex_unlock(&root->fs_info->fs_mutex); | |
1287 | ||
1288 | if (drop_inode) { | |
1289 | inode_dec_link_count(inode); | |
1290 | iput(inode); | |
1291 | } | |
d3c2fdcf | 1292 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
1293 | return err; |
1294 | } | |
1295 | ||
39279cc3 CM |
1296 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1297 | int mode, struct nameidata *nd) | |
1298 | { | |
1299 | struct btrfs_trans_handle *trans; | |
1300 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1301 | struct inode *inode; | |
1302 | int err; | |
1303 | int drop_inode = 0; | |
d3c2fdcf | 1304 | unsigned long nr; |
39279cc3 CM |
1305 | u64 objectid; |
1306 | ||
1307 | mutex_lock(&root->fs_info->fs_mutex); | |
1308 | trans = btrfs_start_transaction(root, 1); | |
1309 | btrfs_set_trans_block_group(trans, dir); | |
1310 | ||
1311 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1312 | if (err) { | |
1313 | err = -ENOSPC; | |
1314 | goto out_unlock; | |
1315 | } | |
1316 | ||
1317 | inode = btrfs_new_inode(trans, root, objectid, | |
1318 | BTRFS_I(dir)->block_group, mode); | |
1319 | err = PTR_ERR(inode); | |
1320 | if (IS_ERR(inode)) | |
1321 | goto out_unlock; | |
1322 | ||
1323 | btrfs_set_trans_block_group(trans, inode); | |
1324 | err = btrfs_add_nondir(trans, dentry, inode); | |
1325 | if (err) | |
1326 | drop_inode = 1; | |
1327 | else { | |
1328 | inode->i_mapping->a_ops = &btrfs_aops; | |
1329 | inode->i_fop = &btrfs_file_operations; | |
1330 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1331 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1332 | inode->i_mapping, GFP_NOFS); | |
07157aac | 1333 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
1334 | } |
1335 | dir->i_sb->s_dirt = 1; | |
1336 | btrfs_update_inode_block_group(trans, inode); | |
1337 | btrfs_update_inode_block_group(trans, dir); | |
1338 | out_unlock: | |
d3c2fdcf | 1339 | nr = trans->blocks_used; |
39279cc3 CM |
1340 | btrfs_end_transaction(trans, root); |
1341 | mutex_unlock(&root->fs_info->fs_mutex); | |
1342 | ||
1343 | if (drop_inode) { | |
1344 | inode_dec_link_count(inode); | |
1345 | iput(inode); | |
1346 | } | |
d3c2fdcf | 1347 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1348 | return err; |
1349 | } | |
1350 | ||
1351 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1352 | struct dentry *dentry) | |
1353 | { | |
1354 | struct btrfs_trans_handle *trans; | |
1355 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1356 | struct inode *inode = old_dentry->d_inode; | |
d3c2fdcf | 1357 | unsigned long nr; |
39279cc3 CM |
1358 | int err; |
1359 | int drop_inode = 0; | |
1360 | ||
1361 | if (inode->i_nlink == 0) | |
1362 | return -ENOENT; | |
1363 | ||
1364 | inc_nlink(inode); | |
1365 | mutex_lock(&root->fs_info->fs_mutex); | |
1366 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1367 | |
39279cc3 CM |
1368 | btrfs_set_trans_block_group(trans, dir); |
1369 | atomic_inc(&inode->i_count); | |
1370 | err = btrfs_add_nondir(trans, dentry, inode); | |
5f39d397 | 1371 | |
39279cc3 CM |
1372 | if (err) |
1373 | drop_inode = 1; | |
5f39d397 | 1374 | |
39279cc3 CM |
1375 | dir->i_sb->s_dirt = 1; |
1376 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1377 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1378 | |
54aa1f4d CM |
1379 | if (err) |
1380 | drop_inode = 1; | |
39279cc3 | 1381 | |
d3c2fdcf | 1382 | nr = trans->blocks_used; |
39279cc3 CM |
1383 | btrfs_end_transaction(trans, root); |
1384 | mutex_unlock(&root->fs_info->fs_mutex); | |
1385 | ||
1386 | if (drop_inode) { | |
1387 | inode_dec_link_count(inode); | |
1388 | iput(inode); | |
1389 | } | |
d3c2fdcf | 1390 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1391 | return err; |
1392 | } | |
1393 | ||
1394 | static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans, | |
1395 | struct btrfs_root *root, | |
1396 | u64 objectid, u64 dirid) | |
1397 | { | |
1398 | int ret; | |
1399 | char buf[2]; | |
1400 | struct btrfs_key key; | |
1401 | ||
1402 | buf[0] = '.'; | |
1403 | buf[1] = '.'; | |
1404 | ||
1405 | key.objectid = objectid; | |
1406 | key.offset = 0; | |
39279cc3 CM |
1407 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1408 | ||
1409 | ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid, | |
1410 | &key, BTRFS_FT_DIR); | |
1411 | if (ret) | |
1412 | goto error; | |
5f39d397 | 1413 | |
39279cc3 CM |
1414 | key.objectid = dirid; |
1415 | ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid, | |
1416 | &key, BTRFS_FT_DIR); | |
1417 | if (ret) | |
1418 | goto error; | |
1419 | error: | |
1420 | return ret; | |
1421 | } | |
1422 | ||
1423 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
1424 | { | |
1425 | struct inode *inode; | |
1426 | struct btrfs_trans_handle *trans; | |
1427 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1428 | int err = 0; | |
1429 | int drop_on_err = 0; | |
1430 | u64 objectid; | |
d3c2fdcf | 1431 | unsigned long nr = 1; |
39279cc3 CM |
1432 | |
1433 | mutex_lock(&root->fs_info->fs_mutex); | |
1434 | trans = btrfs_start_transaction(root, 1); | |
1435 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1436 | |
39279cc3 CM |
1437 | if (IS_ERR(trans)) { |
1438 | err = PTR_ERR(trans); | |
1439 | goto out_unlock; | |
1440 | } | |
1441 | ||
1442 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1443 | if (err) { | |
1444 | err = -ENOSPC; | |
1445 | goto out_unlock; | |
1446 | } | |
1447 | ||
1448 | inode = btrfs_new_inode(trans, root, objectid, | |
1449 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1450 | if (IS_ERR(inode)) { | |
1451 | err = PTR_ERR(inode); | |
1452 | goto out_fail; | |
1453 | } | |
5f39d397 | 1454 | |
39279cc3 CM |
1455 | drop_on_err = 1; |
1456 | inode->i_op = &btrfs_dir_inode_operations; | |
1457 | inode->i_fop = &btrfs_dir_file_operations; | |
1458 | btrfs_set_trans_block_group(trans, inode); | |
1459 | ||
1460 | err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino); | |
1461 | if (err) | |
1462 | goto out_fail; | |
1463 | ||
1464 | inode->i_size = 6; | |
1465 | err = btrfs_update_inode(trans, root, inode); | |
1466 | if (err) | |
1467 | goto out_fail; | |
5f39d397 | 1468 | |
39279cc3 CM |
1469 | err = btrfs_add_link(trans, dentry, inode); |
1470 | if (err) | |
1471 | goto out_fail; | |
5f39d397 | 1472 | |
39279cc3 CM |
1473 | d_instantiate(dentry, inode); |
1474 | drop_on_err = 0; | |
1475 | dir->i_sb->s_dirt = 1; | |
1476 | btrfs_update_inode_block_group(trans, inode); | |
1477 | btrfs_update_inode_block_group(trans, dir); | |
1478 | ||
1479 | out_fail: | |
d3c2fdcf | 1480 | nr = trans->blocks_used; |
39279cc3 | 1481 | btrfs_end_transaction(trans, root); |
5f39d397 | 1482 | |
39279cc3 CM |
1483 | out_unlock: |
1484 | mutex_unlock(&root->fs_info->fs_mutex); | |
1485 | if (drop_on_err) | |
1486 | iput(inode); | |
d3c2fdcf | 1487 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1488 | return err; |
1489 | } | |
1490 | ||
a52d9a80 CM |
1491 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1492 | size_t page_offset, u64 start, u64 end, | |
1493 | int create) | |
1494 | { | |
1495 | int ret; | |
1496 | int err = 0; | |
db94535d | 1497 | u64 bytenr; |
a52d9a80 CM |
1498 | u64 extent_start = 0; |
1499 | u64 extent_end = 0; | |
1500 | u64 objectid = inode->i_ino; | |
1501 | u32 found_type; | |
1502 | int failed_insert = 0; | |
1503 | struct btrfs_path *path; | |
1504 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1505 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1506 | struct extent_buffer *leaf; |
1507 | struct btrfs_key found_key; | |
a52d9a80 CM |
1508 | struct extent_map *em = NULL; |
1509 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1510 | struct btrfs_trans_handle *trans = NULL; | |
1511 | ||
1512 | path = btrfs_alloc_path(); | |
1513 | BUG_ON(!path); | |
1514 | mutex_lock(&root->fs_info->fs_mutex); | |
1515 | ||
1516 | again: | |
1517 | em = lookup_extent_mapping(em_tree, start, end); | |
1518 | if (em) { | |
1519 | goto out; | |
1520 | } | |
1521 | if (!em) { | |
1522 | em = alloc_extent_map(GFP_NOFS); | |
1523 | if (!em) { | |
1524 | err = -ENOMEM; | |
1525 | goto out; | |
1526 | } | |
5f39d397 CM |
1527 | em->start = EXTENT_MAP_HOLE; |
1528 | em->end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1529 | } |
1530 | em->bdev = inode->i_sb->s_bdev; | |
1531 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
1532 | objectid, start, 0); | |
1533 | if (ret < 0) { | |
1534 | err = ret; | |
1535 | goto out; | |
1536 | } | |
1537 | ||
1538 | if (ret != 0) { | |
1539 | if (path->slots[0] == 0) | |
1540 | goto not_found; | |
1541 | path->slots[0]--; | |
1542 | } | |
1543 | ||
5f39d397 CM |
1544 | leaf = path->nodes[0]; |
1545 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1546 | struct btrfs_file_extent_item); |
a52d9a80 | 1547 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1548 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1549 | found_type = btrfs_key_type(&found_key); | |
1550 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1551 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1552 | goto not_found; | |
1553 | } | |
1554 | ||
5f39d397 CM |
1555 | found_type = btrfs_file_extent_type(leaf, item); |
1556 | extent_start = found_key.offset; | |
a52d9a80 CM |
1557 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1558 | extent_end = extent_start + | |
db94535d | 1559 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1560 | err = 0; |
b888db2b | 1561 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1562 | em->start = start; |
1563 | if (start < extent_start) { | |
b888db2b CM |
1564 | if (end < extent_start) |
1565 | goto not_found; | |
a52d9a80 CM |
1566 | em->end = extent_end - 1; |
1567 | } else { | |
1568 | em->end = end; | |
1569 | } | |
1570 | goto not_found_em; | |
1571 | } | |
db94535d CM |
1572 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1573 | if (bytenr == 0) { | |
a52d9a80 CM |
1574 | em->start = extent_start; |
1575 | em->end = extent_end - 1; | |
5f39d397 CM |
1576 | em->block_start = EXTENT_MAP_HOLE; |
1577 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1578 | goto insert; |
1579 | } | |
db94535d CM |
1580 | bytenr += btrfs_file_extent_offset(leaf, item); |
1581 | em->block_start = bytenr; | |
a52d9a80 | 1582 | em->block_end = em->block_start + |
db94535d | 1583 | btrfs_file_extent_num_bytes(leaf, item) - 1; |
a52d9a80 CM |
1584 | em->start = extent_start; |
1585 | em->end = extent_end - 1; | |
1586 | goto insert; | |
1587 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1588 | unsigned long ptr; |
a52d9a80 | 1589 | char *map; |
3326d1b0 CM |
1590 | size_t size; |
1591 | size_t extent_offset; | |
1592 | size_t copy_size; | |
a52d9a80 | 1593 | |
5f39d397 CM |
1594 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1595 | path->slots[0])); | |
1596 | ||
db94535d CM |
1597 | extent_end = (extent_start + size) | |
1598 | ((u64)root->sectorsize - 1); | |
b888db2b | 1599 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1600 | em->start = start; |
1601 | if (start < extent_start) { | |
b888db2b CM |
1602 | if (end < extent_start) |
1603 | goto not_found; | |
50b78c24 | 1604 | em->end = extent_end; |
a52d9a80 CM |
1605 | } else { |
1606 | em->end = end; | |
1607 | } | |
1608 | goto not_found_em; | |
1609 | } | |
5f39d397 | 1610 | |
3326d1b0 CM |
1611 | extent_offset = (page->index << PAGE_CACHE_SHIFT) - |
1612 | extent_start; | |
1613 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
1614 | map = kmap(page); | |
ae2f5411 | 1615 | copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset, |
3326d1b0 CM |
1616 | size - extent_offset); |
1617 | ||
a52d9a80 CM |
1618 | em->block_start = EXTENT_MAP_INLINE; |
1619 | em->block_end = EXTENT_MAP_INLINE; | |
3326d1b0 CM |
1620 | em->start = extent_start + extent_offset; |
1621 | em->end = (em->start + copy_size -1) | | |
1622 | ((u64)root->sectorsize -1); | |
5f39d397 | 1623 | |
a52d9a80 CM |
1624 | if (!page) { |
1625 | goto insert; | |
1626 | } | |
5f39d397 | 1627 | |
3326d1b0 | 1628 | read_extent_buffer(leaf, map + page_offset, ptr, copy_size); |
db94535d | 1629 | /* |
3326d1b0 CM |
1630 | memset(map + page_offset + copy_size, 0, |
1631 | PAGE_CACHE_SIZE - copy_size - page_offset); | |
db94535d | 1632 | */ |
50b78c24 | 1633 | flush_dcache_page(page); |
a52d9a80 | 1634 | kunmap(page); |
3326d1b0 | 1635 | set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS); |
a52d9a80 CM |
1636 | goto insert; |
1637 | } else { | |
1638 | printk("unkknown found_type %d\n", found_type); | |
1639 | WARN_ON(1); | |
1640 | } | |
1641 | not_found: | |
1642 | em->start = start; | |
1643 | em->end = end; | |
1644 | not_found_em: | |
5f39d397 CM |
1645 | em->block_start = EXTENT_MAP_HOLE; |
1646 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1647 | insert: |
1648 | btrfs_release_path(root, path); | |
1649 | if (em->start > start || em->end < start) { | |
b888db2b | 1650 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1651 | err = -EIO; |
1652 | goto out; | |
1653 | } | |
1654 | ret = add_extent_mapping(em_tree, em); | |
1655 | if (ret == -EEXIST) { | |
1656 | free_extent_map(em); | |
2bf5a725 | 1657 | em = NULL; |
a52d9a80 CM |
1658 | failed_insert++; |
1659 | if (failed_insert > 5) { | |
1660 | printk("failing to insert %Lu %Lu\n", start, end); | |
1661 | err = -EIO; | |
1662 | goto out; | |
1663 | } | |
a52d9a80 CM |
1664 | goto again; |
1665 | } | |
1666 | err = 0; | |
1667 | out: | |
1668 | btrfs_free_path(path); | |
1669 | if (trans) { | |
1670 | ret = btrfs_end_transaction(trans, root); | |
1671 | if (!err) | |
1672 | err = ret; | |
1673 | } | |
1674 | mutex_unlock(&root->fs_info->fs_mutex); | |
1675 | if (err) { | |
1676 | free_extent_map(em); | |
1677 | WARN_ON(1); | |
1678 | return ERR_PTR(err); | |
1679 | } | |
1680 | return em; | |
1681 | } | |
1682 | ||
d396c6f5 | 1683 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 1684 | { |
d396c6f5 | 1685 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
1686 | } |
1687 | ||
1688 | static int btrfs_prepare_write(struct file *file, struct page *page, | |
1689 | unsigned from, unsigned to) | |
1690 | { | |
a52d9a80 CM |
1691 | return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1692 | page->mapping->host, page, from, to, | |
1693 | btrfs_get_extent); | |
39279cc3 CM |
1694 | } |
1695 | ||
a52d9a80 | 1696 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1697 | { |
a52d9a80 CM |
1698 | struct extent_map_tree *tree; |
1699 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1700 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1701 | } |
a52d9a80 | 1702 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 1703 | { |
a52d9a80 | 1704 | struct extent_map_tree *tree; |
b888db2b CM |
1705 | |
1706 | ||
1707 | if (current->flags & PF_MEMALLOC) { | |
1708 | redirty_page_for_writepage(wbc, page); | |
1709 | unlock_page(page); | |
1710 | return 0; | |
1711 | } | |
a52d9a80 CM |
1712 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1713 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
1714 | } |
1715 | ||
a52d9a80 | 1716 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 1717 | { |
a52d9a80 CM |
1718 | struct extent_map_tree *tree; |
1719 | int ret; | |
8c2383c3 | 1720 | |
a52d9a80 CM |
1721 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1722 | ret = try_release_extent_mapping(tree, page); | |
1723 | if (ret == 1) { | |
1724 | ClearPagePrivate(page); | |
1725 | set_page_private(page, 0); | |
1726 | page_cache_release(page); | |
39279cc3 | 1727 | } |
a52d9a80 | 1728 | return ret; |
39279cc3 CM |
1729 | } |
1730 | ||
a52d9a80 | 1731 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 1732 | { |
a52d9a80 | 1733 | struct extent_map_tree *tree; |
39279cc3 | 1734 | |
a52d9a80 CM |
1735 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1736 | extent_invalidatepage(tree, page, offset); | |
1737 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
1738 | } |
1739 | ||
9ebefb18 CM |
1740 | /* |
1741 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
1742 | * called from a page fault handler when a page is first dirtied. Hence we must | |
1743 | * be careful to check for EOF conditions here. We set the page up correctly | |
1744 | * for a written page which means we get ENOSPC checking when writing into | |
1745 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
1746 | * support these features. | |
1747 | * | |
1748 | * We are not allowed to take the i_mutex here so we have to play games to | |
1749 | * protect against truncate races as the page could now be beyond EOF. Because | |
1750 | * vmtruncate() writes the inode size before removing pages, once we have the | |
1751 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
1752 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
1753 | * unlock the page. | |
1754 | */ | |
1755 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
1756 | { | |
1757 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; | |
1758 | unsigned long end; | |
1759 | loff_t size; | |
1760 | int ret = -EINVAL; | |
a52d9a80 | 1761 | u64 page_start; |
9ebefb18 | 1762 | |
011410bd | 1763 | down_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1764 | lock_page(page); |
1765 | wait_on_page_writeback(page); | |
9ebefb18 | 1766 | size = i_size_read(inode); |
a52d9a80 CM |
1767 | page_start = page->index << PAGE_CACHE_SHIFT; |
1768 | ||
9ebefb18 | 1769 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 1770 | (page_start > size)) { |
9ebefb18 CM |
1771 | /* page got truncated out from underneath us */ |
1772 | goto out_unlock; | |
1773 | } | |
1774 | ||
1775 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 1776 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
1777 | end = size & ~PAGE_CACHE_MASK; |
1778 | else | |
1779 | end = PAGE_CACHE_SIZE; | |
1780 | ||
b888db2b | 1781 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
1782 | |
1783 | out_unlock: | |
011410bd | 1784 | up_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
1785 | unlock_page(page); |
1786 | return ret; | |
1787 | } | |
1788 | ||
39279cc3 CM |
1789 | static void btrfs_truncate(struct inode *inode) |
1790 | { | |
1791 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1792 | int ret; | |
1793 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 1794 | unsigned long nr; |
39279cc3 CM |
1795 | |
1796 | if (!S_ISREG(inode->i_mode)) | |
1797 | return; | |
1798 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
1799 | return; | |
1800 | ||
1801 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
1802 | ||
1803 | mutex_lock(&root->fs_info->fs_mutex); | |
1804 | trans = btrfs_start_transaction(root, 1); | |
1805 | btrfs_set_trans_block_group(trans, inode); | |
1806 | ||
1807 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
1808 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 | 1809 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 1810 | nr = trans->blocks_used; |
5f39d397 | 1811 | |
39279cc3 CM |
1812 | ret = btrfs_end_transaction(trans, root); |
1813 | BUG_ON(ret); | |
1814 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1815 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1816 | } |
1817 | ||
1818 | int btrfs_commit_write(struct file *file, struct page *page, | |
1819 | unsigned from, unsigned to) | |
1820 | { | |
a52d9a80 CM |
1821 | return extent_commit_write(&BTRFS_I(page->mapping->host)->extent_tree, |
1822 | page->mapping->host, page, from, to); | |
39279cc3 CM |
1823 | } |
1824 | ||
1825 | static int create_subvol(struct btrfs_root *root, char *name, int namelen) | |
1826 | { | |
1827 | struct btrfs_trans_handle *trans; | |
1828 | struct btrfs_key key; | |
1829 | struct btrfs_root_item root_item; | |
1830 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 1831 | struct extent_buffer *leaf; |
39279cc3 CM |
1832 | struct btrfs_root *new_root; |
1833 | struct inode *inode; | |
1834 | struct inode *dir; | |
1835 | int ret; | |
54aa1f4d | 1836 | int err; |
39279cc3 CM |
1837 | u64 objectid; |
1838 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 1839 | unsigned long nr = 1; |
39279cc3 CM |
1840 | |
1841 | mutex_lock(&root->fs_info->fs_mutex); | |
1842 | trans = btrfs_start_transaction(root, 1); | |
1843 | BUG_ON(!trans); | |
1844 | ||
db94535d | 1845 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, 0); |
5f39d397 CM |
1846 | if (IS_ERR(leaf)) |
1847 | return PTR_ERR(leaf); | |
1848 | ||
1849 | btrfs_set_header_nritems(leaf, 0); | |
1850 | btrfs_set_header_level(leaf, 0); | |
db94535d | 1851 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 CM |
1852 | btrfs_set_header_generation(leaf, trans->transid); |
1853 | btrfs_set_header_owner(leaf, root->root_key.objectid); | |
1854 | write_extent_buffer(leaf, root->fs_info->fsid, | |
1855 | (unsigned long)btrfs_header_fsid(leaf), | |
1856 | BTRFS_FSID_SIZE); | |
1857 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
1858 | |
1859 | inode_item = &root_item.inode; | |
1860 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
1861 | inode_item->generation = cpu_to_le64(1); |
1862 | inode_item->size = cpu_to_le64(3); | |
1863 | inode_item->nlink = cpu_to_le32(1); | |
1864 | inode_item->nblocks = cpu_to_le64(1); | |
1865 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 1866 | |
db94535d CM |
1867 | btrfs_set_root_bytenr(&root_item, leaf->start); |
1868 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 1869 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
1870 | btrfs_set_root_used(&root_item, 0); |
1871 | ||
5eda7b5e CM |
1872 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
1873 | root_item.drop_level = 0; | |
5f39d397 CM |
1874 | |
1875 | free_extent_buffer(leaf); | |
1876 | leaf = NULL; | |
39279cc3 CM |
1877 | |
1878 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
1879 | 0, &objectid); | |
54aa1f4d CM |
1880 | if (ret) |
1881 | goto fail; | |
39279cc3 CM |
1882 | |
1883 | btrfs_set_root_dirid(&root_item, new_dirid); | |
1884 | ||
1885 | key.objectid = objectid; | |
1886 | key.offset = 1; | |
39279cc3 CM |
1887 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
1888 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1889 | &root_item); | |
54aa1f4d CM |
1890 | if (ret) |
1891 | goto fail; | |
39279cc3 CM |
1892 | |
1893 | /* | |
1894 | * insert the directory item | |
1895 | */ | |
1896 | key.offset = (u64)-1; | |
1897 | dir = root->fs_info->sb->s_root->d_inode; | |
1898 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1899 | name, namelen, dir->i_ino, &key, | |
1900 | BTRFS_FT_DIR); | |
54aa1f4d CM |
1901 | if (ret) |
1902 | goto fail; | |
39279cc3 CM |
1903 | |
1904 | ret = btrfs_commit_transaction(trans, root); | |
54aa1f4d CM |
1905 | if (ret) |
1906 | goto fail_commit; | |
39279cc3 | 1907 | |
58176a96 | 1908 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
1909 | BUG_ON(!new_root); |
1910 | ||
1911 | trans = btrfs_start_transaction(new_root, 1); | |
1912 | BUG_ON(!trans); | |
1913 | ||
1914 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
1915 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
1916 | if (IS_ERR(inode)) |
1917 | goto fail; | |
39279cc3 CM |
1918 | inode->i_op = &btrfs_dir_inode_operations; |
1919 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 1920 | new_root->inode = inode; |
39279cc3 CM |
1921 | |
1922 | ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid); | |
54aa1f4d CM |
1923 | if (ret) |
1924 | goto fail; | |
39279cc3 CM |
1925 | |
1926 | inode->i_nlink = 1; | |
1927 | inode->i_size = 6; | |
1928 | ret = btrfs_update_inode(trans, new_root, inode); | |
54aa1f4d CM |
1929 | if (ret) |
1930 | goto fail; | |
1931 | fail: | |
d3c2fdcf | 1932 | nr = trans->blocks_used; |
54aa1f4d CM |
1933 | err = btrfs_commit_transaction(trans, root); |
1934 | if (err && !ret) | |
1935 | ret = err; | |
1936 | fail_commit: | |
39279cc3 | 1937 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 1938 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 1939 | return ret; |
39279cc3 CM |
1940 | } |
1941 | ||
1942 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
1943 | { | |
1944 | struct btrfs_trans_handle *trans; | |
1945 | struct btrfs_key key; | |
1946 | struct btrfs_root_item new_root_item; | |
5f39d397 | 1947 | struct extent_buffer *tmp; |
39279cc3 | 1948 | int ret; |
54aa1f4d | 1949 | int err; |
39279cc3 | 1950 | u64 objectid; |
d3c2fdcf | 1951 | unsigned long nr; |
39279cc3 CM |
1952 | |
1953 | if (!root->ref_cows) | |
1954 | return -EINVAL; | |
1955 | ||
011410bd CM |
1956 | down_write(&root->snap_sem); |
1957 | freeze_bdev(root->fs_info->sb->s_bdev); | |
1958 | thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb); | |
1959 | ||
39279cc3 CM |
1960 | mutex_lock(&root->fs_info->fs_mutex); |
1961 | trans = btrfs_start_transaction(root, 1); | |
1962 | BUG_ON(!trans); | |
1963 | ||
1964 | ret = btrfs_update_inode(trans, root, root->inode); | |
54aa1f4d CM |
1965 | if (ret) |
1966 | goto fail; | |
39279cc3 CM |
1967 | |
1968 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
1969 | 0, &objectid); | |
54aa1f4d CM |
1970 | if (ret) |
1971 | goto fail; | |
39279cc3 CM |
1972 | |
1973 | memcpy(&new_root_item, &root->root_item, | |
1974 | sizeof(new_root_item)); | |
1975 | ||
1976 | key.objectid = objectid; | |
1977 | key.offset = 1; | |
39279cc3 | 1978 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
5f39d397 | 1979 | |
83df7c1d | 1980 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); |
db94535d CM |
1981 | btrfs_set_root_bytenr(&new_root_item, root->node->start); |
1982 | btrfs_set_root_level(&new_root_item, btrfs_header_level(root->node)); | |
39279cc3 CM |
1983 | |
1984 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
1985 | &new_root_item); | |
54aa1f4d CM |
1986 | if (ret) |
1987 | goto fail; | |
39279cc3 CM |
1988 | |
1989 | /* | |
1990 | * insert the directory item | |
1991 | */ | |
1992 | key.offset = (u64)-1; | |
1993 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
1994 | name, namelen, | |
1995 | root->fs_info->sb->s_root->d_inode->i_ino, | |
1996 | &key, BTRFS_FT_DIR); | |
1997 | ||
54aa1f4d CM |
1998 | if (ret) |
1999 | goto fail; | |
39279cc3 CM |
2000 | |
2001 | ret = btrfs_inc_root_ref(trans, root); | |
54aa1f4d CM |
2002 | if (ret) |
2003 | goto fail; | |
54aa1f4d | 2004 | fail: |
d3c2fdcf | 2005 | nr = trans->blocks_used; |
54aa1f4d | 2006 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2007 | |
54aa1f4d CM |
2008 | if (err && !ret) |
2009 | ret = err; | |
5f39d397 | 2010 | |
39279cc3 | 2011 | mutex_unlock(&root->fs_info->fs_mutex); |
011410bd | 2012 | up_write(&root->snap_sem); |
d3c2fdcf | 2013 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2014 | return ret; |
39279cc3 CM |
2015 | } |
2016 | ||
86479a04 CM |
2017 | static unsigned long force_ra(struct address_space *mapping, |
2018 | struct file_ra_state *ra, struct file *file, | |
2019 | pgoff_t offset, pgoff_t last_index) | |
2020 | { | |
2021 | pgoff_t req_size; | |
2022 | ||
2023 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2024 | req_size = last_index - offset + 1; | |
2025 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2026 | return offset; | |
2027 | #else | |
2028 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2029 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2030 | return offset + req_size; | |
2031 | #endif | |
2032 | } | |
2033 | ||
2034 | int btrfs_defrag_file(struct file *file) { | |
2035 | struct inode *inode = file->f_path.dentry->d_inode; | |
2036 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
2037 | struct page *page; | |
2038 | unsigned long last_index; | |
2039 | unsigned long ra_index = 0; | |
2040 | u64 page_start; | |
2041 | u64 page_end; | |
2042 | unsigned long i; | |
2043 | ||
2044 | mutex_lock(&inode->i_mutex); | |
2045 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2046 | for (i = 0; i <= last_index; i++) { | |
2047 | if (i == ra_index) { | |
2048 | ra_index = force_ra(inode->i_mapping, &file->f_ra, | |
2049 | file, ra_index, last_index); | |
2050 | } | |
2051 | page = grab_cache_page(inode->i_mapping, i); | |
2052 | if (!page) | |
2053 | goto out_unlock; | |
2054 | if (!PageUptodate(page)) { | |
2055 | btrfs_readpage(NULL, page); | |
2056 | lock_page(page); | |
2057 | if (!PageUptodate(page)) { | |
2058 | unlock_page(page); | |
2059 | page_cache_release(page); | |
2060 | goto out_unlock; | |
2061 | } | |
2062 | } | |
2063 | page_start = page->index << PAGE_CACHE_SHIFT; | |
2064 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
2065 | ||
2066 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2067 | set_extent_delalloc(em_tree, page_start, | |
2068 | page_end, GFP_NOFS); | |
2069 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
2070 | set_page_dirty(page); | |
2071 | unlock_page(page); | |
2072 | page_cache_release(page); | |
2073 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2074 | } | |
2075 | ||
2076 | out_unlock: | |
2077 | mutex_unlock(&inode->i_mutex); | |
2078 | return 0; | |
2079 | } | |
2080 | ||
d03581f4 | 2081 | static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg) |
39279cc3 | 2082 | { |
39279cc3 | 2083 | struct btrfs_ioctl_vol_args vol_args; |
39279cc3 | 2084 | struct btrfs_dir_item *di; |
39279cc3 | 2085 | struct btrfs_path *path; |
d03581f4 | 2086 | int namelen; |
39279cc3 CM |
2087 | u64 root_dirid; |
2088 | ||
d03581f4 CH |
2089 | if (copy_from_user(&vol_args, arg, sizeof(vol_args))) |
2090 | return -EFAULT; | |
5f39d397 | 2091 | |
d03581f4 CH |
2092 | namelen = strlen(vol_args.name); |
2093 | if (namelen > BTRFS_VOL_NAME_MAX) | |
2094 | return -EINVAL; | |
2095 | if (strchr(vol_args.name, '/')) | |
2096 | return -EINVAL; | |
2097 | ||
2098 | path = btrfs_alloc_path(); | |
2099 | if (!path) | |
2100 | return -ENOMEM; | |
2101 | ||
2102 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2103 | mutex_lock(&root->fs_info->fs_mutex); | |
2104 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2105 | path, root_dirid, | |
2106 | vol_args.name, namelen, 0); | |
2107 | mutex_unlock(&root->fs_info->fs_mutex); | |
2108 | btrfs_free_path(path); | |
2109 | if (di && !IS_ERR(di)) | |
2110 | return -EEXIST; | |
2111 | if (IS_ERR(di)) | |
2112 | return PTR_ERR(di); | |
2113 | ||
2114 | if (root == root->fs_info->tree_root) | |
2115 | return create_subvol(root, vol_args.name, namelen); | |
2116 | return create_snapshot(root, vol_args.name, namelen); | |
2117 | } | |
2118 | ||
2119 | static int btrfs_ioctl_defrag(struct file *file) | |
2120 | { | |
2121 | struct inode *inode = file->f_path.dentry->d_inode; | |
2122 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2123 | ||
2124 | switch (inode->i_mode & S_IFMT) { | |
2125 | case S_IFDIR: | |
39279cc3 | 2126 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2127 | btrfs_defrag_root(root, 0); |
2128 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2129 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2130 | break; |
d03581f4 CH |
2131 | case S_IFREG: |
2132 | btrfs_defrag_file(file); | |
2133 | break; | |
2134 | } | |
2135 | ||
2136 | return 0; | |
2137 | } | |
6702ed49 | 2138 | |
d03581f4 CH |
2139 | long btrfs_ioctl(struct file *file, unsigned int |
2140 | cmd, unsigned long arg) | |
2141 | { | |
2142 | struct btrfs_root *root = BTRFS_I(file->f_path.dentry->d_inode)->root; | |
2143 | ||
2144 | switch (cmd) { | |
2145 | case BTRFS_IOC_SNAP_CREATE: | |
2146 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2147 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2148 | return btrfs_ioctl_defrag(file); |
39279cc3 | 2149 | } |
d03581f4 CH |
2150 | |
2151 | return -ENOTTY; | |
39279cc3 CM |
2152 | } |
2153 | ||
39279cc3 CM |
2154 | /* |
2155 | * Called inside transaction, so use GFP_NOFS | |
2156 | */ | |
2157 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2158 | { | |
2159 | struct btrfs_inode *ei; | |
2160 | ||
2161 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2162 | if (!ei) | |
2163 | return NULL; | |
15ee9bc7 | 2164 | ei->last_trans = 0; |
39279cc3 CM |
2165 | return &ei->vfs_inode; |
2166 | } | |
2167 | ||
2168 | void btrfs_destroy_inode(struct inode *inode) | |
2169 | { | |
2170 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2171 | WARN_ON(inode->i_data.nrpages); | |
2172 | ||
2173 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2174 | } | |
2175 | ||
2176 | static void init_once(void * foo, struct kmem_cache * cachep, | |
2177 | unsigned long flags) | |
2178 | { | |
2179 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2180 | ||
2181 | inode_init_once(&ei->vfs_inode); | |
2182 | } | |
2183 | ||
2184 | void btrfs_destroy_cachep(void) | |
2185 | { | |
2186 | if (btrfs_inode_cachep) | |
2187 | kmem_cache_destroy(btrfs_inode_cachep); | |
2188 | if (btrfs_trans_handle_cachep) | |
2189 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2190 | if (btrfs_transaction_cachep) | |
2191 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2192 | if (btrfs_bit_radix_cachep) | |
2193 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2194 | if (btrfs_path_cachep) | |
2195 | kmem_cache_destroy(btrfs_path_cachep); | |
2196 | } | |
2197 | ||
86479a04 | 2198 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d CM |
2199 | unsigned long extra_flags, |
2200 | void (*ctor)(void *, struct kmem_cache *, | |
2201 | unsigned long)) | |
2202 | { | |
2203 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2204 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2205 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2206 | ,NULL | |
2207 | #endif | |
2208 | ); | |
2209 | } | |
2210 | ||
39279cc3 CM |
2211 | int btrfs_init_cachep(void) |
2212 | { | |
86479a04 | 2213 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2214 | sizeof(struct btrfs_inode), |
2215 | 0, init_once); | |
39279cc3 CM |
2216 | if (!btrfs_inode_cachep) |
2217 | goto fail; | |
86479a04 CM |
2218 | btrfs_trans_handle_cachep = |
2219 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2220 | sizeof(struct btrfs_trans_handle), | |
2221 | 0, NULL); | |
39279cc3 CM |
2222 | if (!btrfs_trans_handle_cachep) |
2223 | goto fail; | |
86479a04 | 2224 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2225 | sizeof(struct btrfs_transaction), |
92fee66d | 2226 | 0, NULL); |
39279cc3 CM |
2227 | if (!btrfs_transaction_cachep) |
2228 | goto fail; | |
86479a04 | 2229 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2230 | sizeof(struct btrfs_path), |
92fee66d | 2231 | 0, NULL); |
39279cc3 CM |
2232 | if (!btrfs_path_cachep) |
2233 | goto fail; | |
86479a04 | 2234 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2235 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2236 | if (!btrfs_bit_radix_cachep) |
2237 | goto fail; | |
2238 | return 0; | |
2239 | fail: | |
2240 | btrfs_destroy_cachep(); | |
2241 | return -ENOMEM; | |
2242 | } | |
2243 | ||
2244 | static int btrfs_getattr(struct vfsmount *mnt, | |
2245 | struct dentry *dentry, struct kstat *stat) | |
2246 | { | |
2247 | struct inode *inode = dentry->d_inode; | |
2248 | generic_fillattr(inode, stat); | |
2249 | stat->blksize = 256 * 1024; | |
2250 | return 0; | |
2251 | } | |
2252 | ||
2253 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2254 | struct inode * new_dir,struct dentry *new_dentry) | |
2255 | { | |
2256 | struct btrfs_trans_handle *trans; | |
2257 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2258 | struct inode *new_inode = new_dentry->d_inode; | |
2259 | struct inode *old_inode = old_dentry->d_inode; | |
2260 | struct timespec ctime = CURRENT_TIME; | |
2261 | struct btrfs_path *path; | |
2262 | struct btrfs_dir_item *di; | |
2263 | int ret; | |
2264 | ||
2265 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2266 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2267 | return -ENOTEMPTY; | |
2268 | } | |
5f39d397 | 2269 | |
39279cc3 CM |
2270 | mutex_lock(&root->fs_info->fs_mutex); |
2271 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 2272 | |
39279cc3 CM |
2273 | btrfs_set_trans_block_group(trans, new_dir); |
2274 | path = btrfs_alloc_path(); | |
2275 | if (!path) { | |
2276 | ret = -ENOMEM; | |
2277 | goto out_fail; | |
2278 | } | |
2279 | ||
2280 | old_dentry->d_inode->i_nlink++; | |
2281 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2282 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2283 | old_inode->i_ctime = ctime; | |
5f39d397 | 2284 | |
39279cc3 CM |
2285 | if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) { |
2286 | struct btrfs_key *location = &BTRFS_I(new_dir)->location; | |
5f39d397 | 2287 | struct btrfs_key old_parent_key; |
39279cc3 CM |
2288 | di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino, |
2289 | "..", 2, -1); | |
2290 | if (IS_ERR(di)) { | |
2291 | ret = PTR_ERR(di); | |
2292 | goto out_fail; | |
2293 | } | |
2294 | if (!di) { | |
2295 | ret = -ENOENT; | |
2296 | goto out_fail; | |
2297 | } | |
5f39d397 | 2298 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &old_parent_key); |
39279cc3 CM |
2299 | ret = btrfs_del_item(trans, root, path); |
2300 | if (ret) { | |
39279cc3 CM |
2301 | goto out_fail; |
2302 | } | |
2303 | btrfs_release_path(root, path); | |
2304 | ||
2305 | di = btrfs_lookup_dir_index_item(trans, root, path, | |
2306 | old_inode->i_ino, | |
5f39d397 | 2307 | old_parent_key.objectid, |
39279cc3 CM |
2308 | "..", 2, -1); |
2309 | if (IS_ERR(di)) { | |
2310 | ret = PTR_ERR(di); | |
2311 | goto out_fail; | |
2312 | } | |
2313 | if (!di) { | |
2314 | ret = -ENOENT; | |
2315 | goto out_fail; | |
2316 | } | |
2317 | ret = btrfs_del_item(trans, root, path); | |
2318 | if (ret) { | |
39279cc3 CM |
2319 | goto out_fail; |
2320 | } | |
2321 | btrfs_release_path(root, path); | |
2322 | ||
2323 | ret = btrfs_insert_dir_item(trans, root, "..", 2, | |
2324 | old_inode->i_ino, location, | |
2325 | BTRFS_FT_DIR); | |
2326 | if (ret) | |
2327 | goto out_fail; | |
2328 | } | |
2329 | ||
2330 | ||
2331 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); | |
2332 | if (ret) | |
2333 | goto out_fail; | |
2334 | ||
2335 | if (new_inode) { | |
2336 | new_inode->i_ctime = CURRENT_TIME; | |
2337 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2338 | if (ret) | |
2339 | goto out_fail; | |
39279cc3 CM |
2340 | } |
2341 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2342 | if (ret) | |
2343 | goto out_fail; | |
2344 | ||
2345 | out_fail: | |
2346 | btrfs_free_path(path); | |
2347 | btrfs_end_transaction(trans, root); | |
2348 | mutex_unlock(&root->fs_info->fs_mutex); | |
2349 | return ret; | |
2350 | } | |
2351 | ||
2352 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2353 | const char *symname) | |
2354 | { | |
2355 | struct btrfs_trans_handle *trans; | |
2356 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2357 | struct btrfs_path *path; | |
2358 | struct btrfs_key key; | |
2359 | struct inode *inode; | |
2360 | int err; | |
2361 | int drop_inode = 0; | |
2362 | u64 objectid; | |
2363 | int name_len; | |
2364 | int datasize; | |
5f39d397 | 2365 | unsigned long ptr; |
39279cc3 | 2366 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2367 | struct extent_buffer *leaf; |
d3c2fdcf | 2368 | unsigned long nr; |
39279cc3 CM |
2369 | |
2370 | name_len = strlen(symname) + 1; | |
2371 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2372 | return -ENAMETOOLONG; | |
2373 | mutex_lock(&root->fs_info->fs_mutex); | |
2374 | trans = btrfs_start_transaction(root, 1); | |
2375 | btrfs_set_trans_block_group(trans, dir); | |
2376 | ||
2377 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2378 | if (err) { | |
2379 | err = -ENOSPC; | |
2380 | goto out_unlock; | |
2381 | } | |
2382 | ||
2383 | inode = btrfs_new_inode(trans, root, objectid, | |
2384 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2385 | err = PTR_ERR(inode); | |
2386 | if (IS_ERR(inode)) | |
2387 | goto out_unlock; | |
2388 | ||
2389 | btrfs_set_trans_block_group(trans, inode); | |
2390 | err = btrfs_add_nondir(trans, dentry, inode); | |
2391 | if (err) | |
2392 | drop_inode = 1; | |
2393 | else { | |
2394 | inode->i_mapping->a_ops = &btrfs_aops; | |
2395 | inode->i_fop = &btrfs_file_operations; | |
2396 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2397 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2398 | inode->i_mapping, GFP_NOFS); | |
07157aac | 2399 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
2400 | } |
2401 | dir->i_sb->s_dirt = 1; | |
2402 | btrfs_update_inode_block_group(trans, inode); | |
2403 | btrfs_update_inode_block_group(trans, dir); | |
2404 | if (drop_inode) | |
2405 | goto out_unlock; | |
2406 | ||
2407 | path = btrfs_alloc_path(); | |
2408 | BUG_ON(!path); | |
2409 | key.objectid = inode->i_ino; | |
2410 | key.offset = 0; | |
39279cc3 CM |
2411 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2412 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2413 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2414 | datasize); | |
54aa1f4d CM |
2415 | if (err) { |
2416 | drop_inode = 1; | |
2417 | goto out_unlock; | |
2418 | } | |
5f39d397 CM |
2419 | leaf = path->nodes[0]; |
2420 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2421 | struct btrfs_file_extent_item); | |
2422 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2423 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2424 | BTRFS_FILE_EXTENT_INLINE); |
2425 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2426 | write_extent_buffer(leaf, symname, ptr, name_len); |
2427 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2428 | btrfs_free_path(path); |
5f39d397 | 2429 | |
39279cc3 CM |
2430 | inode->i_op = &btrfs_symlink_inode_operations; |
2431 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2432 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2433 | err = btrfs_update_inode(trans, root, inode); |
2434 | if (err) | |
2435 | drop_inode = 1; | |
39279cc3 CM |
2436 | |
2437 | out_unlock: | |
d3c2fdcf | 2438 | nr = trans->blocks_used; |
39279cc3 CM |
2439 | btrfs_end_transaction(trans, root); |
2440 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
2441 | if (drop_inode) { |
2442 | inode_dec_link_count(inode); | |
2443 | iput(inode); | |
2444 | } | |
d3c2fdcf | 2445 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2446 | return err; |
2447 | } | |
2448 | ||
2449 | static struct inode_operations btrfs_dir_inode_operations = { | |
2450 | .lookup = btrfs_lookup, | |
2451 | .create = btrfs_create, | |
2452 | .unlink = btrfs_unlink, | |
2453 | .link = btrfs_link, | |
2454 | .mkdir = btrfs_mkdir, | |
2455 | .rmdir = btrfs_rmdir, | |
2456 | .rename = btrfs_rename, | |
2457 | .symlink = btrfs_symlink, | |
2458 | .setattr = btrfs_setattr, | |
618e21d5 | 2459 | .mknod = btrfs_mknod, |
39279cc3 CM |
2460 | }; |
2461 | ||
2462 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2463 | .lookup = btrfs_lookup, | |
2464 | }; | |
2465 | ||
2466 | static struct file_operations btrfs_dir_file_operations = { | |
2467 | .llseek = generic_file_llseek, | |
2468 | .read = generic_read_dir, | |
2469 | .readdir = btrfs_readdir, | |
34287aa3 | 2470 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2471 | #ifdef CONFIG_COMPAT |
34287aa3 | 2472 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2473 | #endif |
2474 | }; | |
2475 | ||
07157aac CM |
2476 | static struct extent_map_ops btrfs_extent_map_ops = { |
2477 | .fill_delalloc = run_delalloc_range, | |
2478 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2479 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2480 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2481 | }; | |
2482 | ||
39279cc3 CM |
2483 | static struct address_space_operations btrfs_aops = { |
2484 | .readpage = btrfs_readpage, | |
2485 | .writepage = btrfs_writepage, | |
2486 | .sync_page = block_sync_page, | |
2487 | .prepare_write = btrfs_prepare_write, | |
2488 | .commit_write = btrfs_commit_write, | |
2489 | .bmap = btrfs_bmap, | |
a52d9a80 CM |
2490 | .invalidatepage = btrfs_invalidatepage, |
2491 | .releasepage = btrfs_releasepage, | |
2492 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2493 | }; |
2494 | ||
2495 | static struct address_space_operations btrfs_symlink_aops = { | |
2496 | .readpage = btrfs_readpage, | |
2497 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2498 | .invalidatepage = btrfs_invalidatepage, |
2499 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2500 | }; |
2501 | ||
2502 | static struct inode_operations btrfs_file_inode_operations = { | |
2503 | .truncate = btrfs_truncate, | |
2504 | .getattr = btrfs_getattr, | |
2505 | .setattr = btrfs_setattr, | |
2506 | }; | |
2507 | ||
618e21d5 JB |
2508 | static struct inode_operations btrfs_special_inode_operations = { |
2509 | .getattr = btrfs_getattr, | |
2510 | .setattr = btrfs_setattr, | |
2511 | }; | |
2512 | ||
39279cc3 CM |
2513 | static struct inode_operations btrfs_symlink_inode_operations = { |
2514 | .readlink = generic_readlink, | |
2515 | .follow_link = page_follow_link_light, | |
2516 | .put_link = page_put_link, | |
2517 | }; |