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Commit | Line | Data |
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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> |
5103e947 | 35 | #include <linux/xattr.h> |
39279cc3 CM |
36 | #include "ctree.h" |
37 | #include "disk-io.h" | |
38 | #include "transaction.h" | |
39 | #include "btrfs_inode.h" | |
40 | #include "ioctl.h" | |
41 | #include "print-tree.h" | |
42 | ||
43 | struct btrfs_iget_args { | |
44 | u64 ino; | |
45 | struct btrfs_root *root; | |
46 | }; | |
47 | ||
48 | static struct inode_operations btrfs_dir_inode_operations; | |
49 | static struct inode_operations btrfs_symlink_inode_operations; | |
50 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 51 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
52 | static struct inode_operations btrfs_file_inode_operations; |
53 | static struct address_space_operations btrfs_aops; | |
54 | static struct address_space_operations btrfs_symlink_aops; | |
55 | static struct file_operations btrfs_dir_file_operations; | |
07157aac | 56 | static struct extent_map_ops btrfs_extent_map_ops; |
39279cc3 CM |
57 | |
58 | static struct kmem_cache *btrfs_inode_cachep; | |
59 | struct kmem_cache *btrfs_trans_handle_cachep; | |
60 | struct kmem_cache *btrfs_transaction_cachep; | |
61 | struct kmem_cache *btrfs_bit_radix_cachep; | |
62 | struct kmem_cache *btrfs_path_cachep; | |
63 | ||
64 | #define S_SHIFT 12 | |
65 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
66 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
67 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
68 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
69 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
70 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
71 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
72 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
73 | }; | |
74 | ||
1832a6d5 CM |
75 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
76 | int for_del) | |
77 | { | |
78 | u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
79 | u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
80 | u64 thresh; | |
81 | int ret = 0; | |
82 | ||
83 | if (for_del) | |
84 | thresh = (total * 90) / 100; | |
85 | else | |
86 | thresh = (total * 85) / 100; | |
87 | ||
88 | spin_lock(&root->fs_info->delalloc_lock); | |
89 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) | |
90 | ret = -ENOSPC; | |
91 | spin_unlock(&root->fs_info->delalloc_lock); | |
92 | return ret; | |
93 | } | |
94 | ||
be20aa9d | 95 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
96 | { |
97 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
98 | struct btrfs_trans_handle *trans; | |
b888db2b | 99 | u64 alloc_hint = 0; |
db94535d | 100 | u64 num_bytes; |
c59f8951 | 101 | u64 cur_alloc_size; |
db94535d | 102 | u64 blocksize = root->sectorsize; |
be20aa9d CM |
103 | struct btrfs_key ins; |
104 | int ret; | |
b888db2b | 105 | |
b888db2b | 106 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 107 | BUG_ON(!trans); |
be20aa9d CM |
108 | btrfs_set_trans_block_group(trans, inode); |
109 | ||
db94535d | 110 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 111 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 112 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 113 | start, start + num_bytes, start, &alloc_hint); |
db94535d | 114 | |
179e29e4 CM |
115 | if (alloc_hint == EXTENT_MAP_INLINE) |
116 | goto out; | |
117 | ||
c59f8951 CM |
118 | while(num_bytes > 0) { |
119 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
120 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
121 | root->root_key.objectid, | |
122 | trans->transid, | |
123 | inode->i_ino, start, 0, | |
124 | alloc_hint, (u64)-1, &ins, 1); | |
125 | if (ret) { | |
126 | WARN_ON(1); | |
127 | goto out; | |
128 | } | |
129 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
130 | start, ins.objectid, ins.offset, | |
131 | ins.offset); | |
132 | num_bytes -= cur_alloc_size; | |
133 | alloc_hint = ins.objectid + ins.offset; | |
134 | start += cur_alloc_size; | |
b888db2b | 135 | } |
b888db2b CM |
136 | out: |
137 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
138 | return ret; |
139 | } | |
140 | ||
141 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
142 | { | |
143 | u64 extent_start; | |
144 | u64 extent_end; | |
145 | u64 bytenr; | |
146 | u64 cow_end; | |
1832a6d5 | 147 | u64 loops = 0; |
be20aa9d CM |
148 | struct btrfs_root *root = BTRFS_I(inode)->root; |
149 | struct extent_buffer *leaf; | |
150 | int found_type; | |
151 | struct btrfs_path *path; | |
152 | struct btrfs_file_extent_item *item; | |
153 | int ret; | |
154 | int err; | |
155 | struct btrfs_key found_key; | |
156 | ||
157 | path = btrfs_alloc_path(); | |
158 | BUG_ON(!path); | |
159 | again: | |
160 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
161 | inode->i_ino, start, 0); | |
162 | if (ret < 0) { | |
163 | btrfs_free_path(path); | |
164 | return ret; | |
165 | } | |
166 | ||
167 | cow_end = end; | |
168 | if (ret != 0) { | |
169 | if (path->slots[0] == 0) | |
170 | goto not_found; | |
171 | path->slots[0]--; | |
172 | } | |
173 | ||
174 | leaf = path->nodes[0]; | |
175 | item = btrfs_item_ptr(leaf, path->slots[0], | |
176 | struct btrfs_file_extent_item); | |
177 | ||
178 | /* are we inside the extent that was found? */ | |
179 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
180 | found_type = btrfs_key_type(&found_key); | |
181 | if (found_key.objectid != inode->i_ino || | |
182 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
183 | goto not_found; | |
184 | } | |
185 | ||
186 | found_type = btrfs_file_extent_type(leaf, item); | |
187 | extent_start = found_key.offset; | |
188 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
189 | extent_end = extent_start + | |
190 | btrfs_file_extent_num_bytes(leaf, item); | |
191 | err = 0; | |
192 | ||
1832a6d5 CM |
193 | if (loops && start != extent_start) |
194 | goto not_found; | |
195 | ||
be20aa9d CM |
196 | if (start < extent_start || start >= extent_end) |
197 | goto not_found; | |
198 | ||
199 | cow_end = min(end, extent_end - 1); | |
200 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
201 | if (bytenr == 0) | |
202 | goto not_found; | |
203 | ||
be20aa9d CM |
204 | if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) { |
205 | goto not_found; | |
206 | } | |
207 | ||
208 | start = extent_end; | |
209 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
210 | goto not_found; | |
211 | } | |
212 | loop: | |
213 | if (start > end) { | |
214 | btrfs_free_path(path); | |
215 | return 0; | |
216 | } | |
217 | btrfs_release_path(root, path); | |
1832a6d5 | 218 | loops++; |
be20aa9d CM |
219 | goto again; |
220 | ||
221 | not_found: | |
222 | cow_file_range(inode, start, cow_end); | |
223 | start = cow_end + 1; | |
224 | goto loop; | |
225 | } | |
226 | ||
227 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
228 | { | |
229 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1832a6d5 | 230 | u64 num_bytes; |
be20aa9d CM |
231 | int ret; |
232 | ||
233 | mutex_lock(&root->fs_info->fs_mutex); | |
234 | if (btrfs_test_opt(root, NODATACOW)) | |
235 | ret = run_delalloc_nocow(inode, start, end); | |
236 | else | |
237 | ret = cow_file_range(inode, start, end); | |
1832a6d5 CM |
238 | |
239 | spin_lock(&root->fs_info->delalloc_lock); | |
240 | num_bytes = end + 1 - start; | |
241 | if (root->fs_info->delalloc_bytes < num_bytes) { | |
242 | printk("delalloc accounting error total %llu sub %llu\n", | |
243 | root->fs_info->delalloc_bytes, num_bytes); | |
244 | } else { | |
245 | root->fs_info->delalloc_bytes -= num_bytes; | |
246 | } | |
247 | spin_unlock(&root->fs_info->delalloc_lock); | |
248 | ||
b888db2b CM |
249 | mutex_unlock(&root->fs_info->fs_mutex); |
250 | return ret; | |
251 | } | |
252 | ||
07157aac CM |
253 | int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end) |
254 | { | |
255 | struct inode *inode = page->mapping->host; | |
256 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
257 | struct btrfs_trans_handle *trans; | |
258 | char *kaddr; | |
b6cda9bc | 259 | int ret = 0; |
35ebb934 | 260 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
07157aac CM |
261 | size_t offset = start - page_start; |
262 | ||
b6cda9bc CM |
263 | if (btrfs_test_opt(root, NODATASUM)) |
264 | return 0; | |
265 | ||
07157aac CM |
266 | mutex_lock(&root->fs_info->fs_mutex); |
267 | trans = btrfs_start_transaction(root, 1); | |
268 | btrfs_set_trans_block_group(trans, inode); | |
269 | kaddr = kmap(page); | |
f578d4bd | 270 | btrfs_csum_file_block(trans, root, inode, inode->i_ino, |
07157aac CM |
271 | start, kaddr + offset, end - start + 1); |
272 | kunmap(page); | |
273 | ret = btrfs_end_transaction(trans, root); | |
274 | BUG_ON(ret); | |
275 | mutex_unlock(&root->fs_info->fs_mutex); | |
276 | return ret; | |
277 | } | |
278 | ||
279 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |
280 | { | |
281 | int ret = 0; | |
282 | struct inode *inode = page->mapping->host; | |
283 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
284 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
285 | struct btrfs_csum_item *item; | |
286 | struct btrfs_path *path = NULL; | |
ff79f819 | 287 | u32 csum; |
07157aac | 288 | |
b6cda9bc CM |
289 | if (btrfs_test_opt(root, NODATASUM)) |
290 | return 0; | |
291 | ||
07157aac CM |
292 | mutex_lock(&root->fs_info->fs_mutex); |
293 | path = btrfs_alloc_path(); | |
294 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
295 | if (IS_ERR(item)) { | |
296 | ret = PTR_ERR(item); | |
297 | /* a csum that isn't present is a preallocated region. */ | |
298 | if (ret == -ENOENT || ret == -EFBIG) | |
299 | ret = 0; | |
ff79f819 | 300 | csum = 0; |
07157aac CM |
301 | goto out; |
302 | } | |
ff79f819 CM |
303 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
304 | BTRFS_CRC32_SIZE); | |
305 | set_state_private(em_tree, start, csum); | |
07157aac CM |
306 | out: |
307 | if (path) | |
308 | btrfs_free_path(path); | |
309 | mutex_unlock(&root->fs_info->fs_mutex); | |
310 | return ret; | |
311 | } | |
312 | ||
313 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) | |
314 | { | |
35ebb934 | 315 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 316 | struct inode *inode = page->mapping->host; |
07157aac CM |
317 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
318 | char *kaddr; | |
319 | u64 private; | |
320 | int ret; | |
ff79f819 CM |
321 | struct btrfs_root *root = BTRFS_I(inode)->root; |
322 | u32 csum = ~(u32)0; | |
bbf0d006 | 323 | unsigned long flags; |
07157aac | 324 | |
b6cda9bc CM |
325 | if (btrfs_test_opt(root, NODATASUM)) |
326 | return 0; | |
327 | ||
07157aac | 328 | ret = get_state_private(em_tree, start, &private); |
bbf0d006 | 329 | local_irq_save(flags); |
07157aac CM |
330 | kaddr = kmap_atomic(page, KM_IRQ0); |
331 | if (ret) { | |
332 | goto zeroit; | |
333 | } | |
ff79f819 CM |
334 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
335 | btrfs_csum_final(csum, (char *)&csum); | |
336 | if (csum != private) { | |
07157aac CM |
337 | goto zeroit; |
338 | } | |
339 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 340 | local_irq_restore(flags); |
07157aac CM |
341 | return 0; |
342 | ||
343 | zeroit: | |
344 | printk("btrfs csum failed ino %lu off %llu\n", | |
345 | page->mapping->host->i_ino, (unsigned long long)start); | |
db94535d CM |
346 | memset(kaddr + offset, 1, end - start + 1); |
347 | flush_dcache_page(page); | |
07157aac | 348 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 349 | local_irq_restore(flags); |
07157aac CM |
350 | return 0; |
351 | } | |
b888db2b | 352 | |
39279cc3 CM |
353 | void btrfs_read_locked_inode(struct inode *inode) |
354 | { | |
355 | struct btrfs_path *path; | |
5f39d397 | 356 | struct extent_buffer *leaf; |
39279cc3 | 357 | struct btrfs_inode_item *inode_item; |
5f39d397 | 358 | struct btrfs_inode_timespec *tspec; |
39279cc3 CM |
359 | struct btrfs_root *root = BTRFS_I(inode)->root; |
360 | struct btrfs_key location; | |
361 | u64 alloc_group_block; | |
618e21d5 | 362 | u32 rdev; |
39279cc3 CM |
363 | int ret; |
364 | ||
365 | path = btrfs_alloc_path(); | |
366 | BUG_ON(!path); | |
39279cc3 CM |
367 | mutex_lock(&root->fs_info->fs_mutex); |
368 | ||
369 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); | |
370 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); | |
5f39d397 | 371 | if (ret) |
39279cc3 | 372 | goto make_bad; |
39279cc3 | 373 | |
5f39d397 CM |
374 | leaf = path->nodes[0]; |
375 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
376 | struct btrfs_inode_item); | |
377 | ||
378 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
379 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
380 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
381 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
382 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
383 | ||
384 | tspec = btrfs_inode_atime(inode_item); | |
385 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
386 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
387 | ||
388 | tspec = btrfs_inode_mtime(inode_item); | |
389 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
390 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
391 | ||
392 | tspec = btrfs_inode_ctime(inode_item); | |
393 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
394 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
395 | ||
396 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
397 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 398 | inode->i_rdev = 0; |
5f39d397 CM |
399 | rdev = btrfs_inode_rdev(leaf, inode_item); |
400 | ||
401 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
402 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
403 | alloc_group_block); | |
404 | ||
e52ec0eb CM |
405 | if (!BTRFS_I(inode)->block_group) { |
406 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
407 | NULL, 0, 0, 0); | |
408 | } | |
39279cc3 CM |
409 | btrfs_free_path(path); |
410 | inode_item = NULL; | |
411 | ||
412 | mutex_unlock(&root->fs_info->fs_mutex); | |
413 | ||
414 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
415 | case S_IFREG: |
416 | inode->i_mapping->a_ops = &btrfs_aops; | |
07157aac | 417 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
418 | inode->i_fop = &btrfs_file_operations; |
419 | inode->i_op = &btrfs_file_inode_operations; | |
420 | break; | |
421 | case S_IFDIR: | |
422 | inode->i_fop = &btrfs_dir_file_operations; | |
423 | if (root == root->fs_info->tree_root) | |
424 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
425 | else | |
426 | inode->i_op = &btrfs_dir_inode_operations; | |
427 | break; | |
428 | case S_IFLNK: | |
429 | inode->i_op = &btrfs_symlink_inode_operations; | |
430 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
431 | break; | |
618e21d5 JB |
432 | default: |
433 | init_special_inode(inode, inode->i_mode, rdev); | |
434 | break; | |
39279cc3 CM |
435 | } |
436 | return; | |
437 | ||
438 | make_bad: | |
439 | btrfs_release_path(root, path); | |
440 | btrfs_free_path(path); | |
441 | mutex_unlock(&root->fs_info->fs_mutex); | |
442 | make_bad_inode(inode); | |
443 | } | |
444 | ||
5f39d397 CM |
445 | static void fill_inode_item(struct extent_buffer *leaf, |
446 | struct btrfs_inode_item *item, | |
39279cc3 CM |
447 | struct inode *inode) |
448 | { | |
5f39d397 CM |
449 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
450 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
451 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
452 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
453 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
454 | ||
455 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
456 | inode->i_atime.tv_sec); | |
457 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
458 | inode->i_atime.tv_nsec); | |
459 | ||
460 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
461 | inode->i_mtime.tv_sec); | |
462 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
463 | inode->i_mtime.tv_nsec); | |
464 | ||
465 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
466 | inode->i_ctime.tv_sec); | |
467 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
468 | inode->i_ctime.tv_nsec); | |
469 | ||
470 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
471 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
472 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
473 | btrfs_set_inode_block_group(leaf, item, | |
39279cc3 CM |
474 | BTRFS_I(inode)->block_group->key.objectid); |
475 | } | |
476 | ||
a52d9a80 | 477 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
478 | struct btrfs_root *root, |
479 | struct inode *inode) | |
480 | { | |
481 | struct btrfs_inode_item *inode_item; | |
482 | struct btrfs_path *path; | |
5f39d397 | 483 | struct extent_buffer *leaf; |
39279cc3 CM |
484 | int ret; |
485 | ||
486 | path = btrfs_alloc_path(); | |
487 | BUG_ON(!path); | |
39279cc3 CM |
488 | ret = btrfs_lookup_inode(trans, root, path, |
489 | &BTRFS_I(inode)->location, 1); | |
490 | if (ret) { | |
491 | if (ret > 0) | |
492 | ret = -ENOENT; | |
493 | goto failed; | |
494 | } | |
495 | ||
5f39d397 CM |
496 | leaf = path->nodes[0]; |
497 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
498 | struct btrfs_inode_item); |
499 | ||
5f39d397 CM |
500 | fill_inode_item(leaf, inode_item, inode); |
501 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 502 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
503 | ret = 0; |
504 | failed: | |
505 | btrfs_release_path(root, path); | |
506 | btrfs_free_path(path); | |
507 | return ret; | |
508 | } | |
509 | ||
510 | ||
511 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
512 | struct btrfs_root *root, | |
513 | struct inode *dir, | |
514 | struct dentry *dentry) | |
515 | { | |
516 | struct btrfs_path *path; | |
517 | const char *name = dentry->d_name.name; | |
518 | int name_len = dentry->d_name.len; | |
519 | int ret = 0; | |
5f39d397 | 520 | struct extent_buffer *leaf; |
39279cc3 | 521 | struct btrfs_dir_item *di; |
5f39d397 | 522 | struct btrfs_key key; |
39279cc3 CM |
523 | |
524 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
525 | if (!path) { |
526 | ret = -ENOMEM; | |
527 | goto err; | |
528 | } | |
529 | ||
39279cc3 CM |
530 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
531 | name, name_len, -1); | |
532 | if (IS_ERR(di)) { | |
533 | ret = PTR_ERR(di); | |
534 | goto err; | |
535 | } | |
536 | if (!di) { | |
537 | ret = -ENOENT; | |
538 | goto err; | |
539 | } | |
5f39d397 CM |
540 | leaf = path->nodes[0]; |
541 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 542 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
543 | if (ret) |
544 | goto err; | |
39279cc3 CM |
545 | btrfs_release_path(root, path); |
546 | ||
547 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 548 | key.objectid, name, name_len, -1); |
39279cc3 CM |
549 | if (IS_ERR(di)) { |
550 | ret = PTR_ERR(di); | |
551 | goto err; | |
552 | } | |
553 | if (!di) { | |
554 | ret = -ENOENT; | |
555 | goto err; | |
556 | } | |
557 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
558 | |
559 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
560 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
561 | dentry->d_inode->i_ino, | |
562 | dentry->d_parent->d_inode->i_ino); | |
563 | if (ret) { | |
564 | printk("failed to delete reference to %.*s, " | |
565 | "inode %lu parent %lu\n", name_len, name, | |
566 | dentry->d_inode->i_ino, | |
567 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 568 | } |
39279cc3 CM |
569 | err: |
570 | btrfs_free_path(path); | |
571 | if (!ret) { | |
572 | dir->i_size -= name_len * 2; | |
79c44584 | 573 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 574 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
575 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
576 | dentry->d_inode->i_nlink--; | |
577 | #else | |
39279cc3 | 578 | drop_nlink(dentry->d_inode); |
6da6abae | 579 | #endif |
54aa1f4d | 580 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
581 | dir->i_sb->s_dirt = 1; |
582 | } | |
583 | return ret; | |
584 | } | |
585 | ||
586 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
587 | { | |
588 | struct btrfs_root *root; | |
589 | struct btrfs_trans_handle *trans; | |
590 | int ret; | |
1832a6d5 | 591 | unsigned long nr = 0; |
39279cc3 CM |
592 | |
593 | root = BTRFS_I(dir)->root; | |
594 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
595 | |
596 | ret = btrfs_check_free_space(root, 1, 1); | |
597 | if (ret) | |
598 | goto fail; | |
599 | ||
39279cc3 | 600 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 601 | |
39279cc3 CM |
602 | btrfs_set_trans_block_group(trans, dir); |
603 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 604 | nr = trans->blocks_used; |
5f39d397 | 605 | |
39279cc3 | 606 | btrfs_end_transaction(trans, root); |
1832a6d5 | 607 | fail: |
39279cc3 | 608 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 609 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
610 | return ret; |
611 | } | |
612 | ||
613 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
614 | { | |
615 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 616 | int err = 0; |
39279cc3 CM |
617 | int ret; |
618 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 619 | struct btrfs_trans_handle *trans; |
1832a6d5 | 620 | unsigned long nr = 0; |
39279cc3 | 621 | |
134d4512 Y |
622 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
623 | return -ENOTEMPTY; | |
624 | ||
39279cc3 | 625 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
626 | ret = btrfs_check_free_space(root, 1, 1); |
627 | if (ret) | |
628 | goto fail; | |
629 | ||
39279cc3 CM |
630 | trans = btrfs_start_transaction(root, 1); |
631 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
632 | |
633 | /* now the directory is empty */ | |
634 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
635 | if (!err) { | |
636 | inode->i_size = 0; | |
637 | } | |
3954401f | 638 | |
d3c2fdcf | 639 | nr = trans->blocks_used; |
39279cc3 | 640 | ret = btrfs_end_transaction(trans, root); |
1832a6d5 | 641 | fail: |
134d4512 | 642 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 643 | btrfs_btree_balance_dirty(root, nr); |
3954401f | 644 | |
39279cc3 CM |
645 | if (ret && !err) |
646 | err = ret; | |
647 | return err; | |
648 | } | |
649 | ||
650 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
651 | struct btrfs_root *root, | |
652 | struct inode *inode) | |
653 | { | |
654 | struct btrfs_path *path; | |
655 | int ret; | |
656 | ||
657 | clear_inode(inode); | |
658 | ||
659 | path = btrfs_alloc_path(); | |
660 | BUG_ON(!path); | |
39279cc3 CM |
661 | ret = btrfs_lookup_inode(trans, root, path, |
662 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
663 | if (ret > 0) |
664 | ret = -ENOENT; | |
665 | if (!ret) | |
666 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
667 | btrfs_free_path(path); |
668 | return ret; | |
669 | } | |
670 | ||
39279cc3 CM |
671 | /* |
672 | * this can truncate away extent items, csum items and directory items. | |
673 | * It starts at a high offset and removes keys until it can't find | |
674 | * any higher than i_size. | |
675 | * | |
676 | * csum items that cross the new i_size are truncated to the new size | |
677 | * as well. | |
678 | */ | |
679 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
680 | struct btrfs_root *root, | |
681 | struct inode *inode) | |
682 | { | |
683 | int ret; | |
684 | struct btrfs_path *path; | |
685 | struct btrfs_key key; | |
5f39d397 | 686 | struct btrfs_key found_key; |
39279cc3 | 687 | u32 found_type; |
5f39d397 | 688 | struct extent_buffer *leaf; |
39279cc3 CM |
689 | struct btrfs_file_extent_item *fi; |
690 | u64 extent_start = 0; | |
db94535d | 691 | u64 extent_num_bytes = 0; |
39279cc3 | 692 | u64 item_end = 0; |
7bb86316 | 693 | u64 root_gen = 0; |
d8d5f3e1 | 694 | u64 root_owner = 0; |
39279cc3 CM |
695 | int found_extent; |
696 | int del_item; | |
179e29e4 | 697 | int extent_type = -1; |
39279cc3 | 698 | |
a52d9a80 | 699 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 700 | path = btrfs_alloc_path(); |
3c69faec | 701 | path->reada = -1; |
39279cc3 | 702 | BUG_ON(!path); |
5f39d397 | 703 | |
39279cc3 CM |
704 | /* FIXME, add redo link to tree so we don't leak on crash */ |
705 | key.objectid = inode->i_ino; | |
706 | key.offset = (u64)-1; | |
5f39d397 CM |
707 | key.type = (u8)-1; |
708 | ||
39279cc3 CM |
709 | while(1) { |
710 | btrfs_init_path(path); | |
711 | fi = NULL; | |
712 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
713 | if (ret < 0) { | |
714 | goto error; | |
715 | } | |
716 | if (ret > 0) { | |
717 | BUG_ON(path->slots[0] == 0); | |
718 | path->slots[0]--; | |
719 | } | |
5f39d397 CM |
720 | leaf = path->nodes[0]; |
721 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
722 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 723 | |
5f39d397 | 724 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 725 | break; |
5f39d397 | 726 | |
39279cc3 CM |
727 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
728 | found_type != BTRFS_DIR_ITEM_KEY && | |
729 | found_type != BTRFS_DIR_INDEX_KEY && | |
730 | found_type != BTRFS_EXTENT_DATA_KEY) | |
731 | break; | |
732 | ||
5f39d397 | 733 | item_end = found_key.offset; |
39279cc3 | 734 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 735 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 736 | struct btrfs_file_extent_item); |
179e29e4 CM |
737 | extent_type = btrfs_file_extent_type(leaf, fi); |
738 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 739 | item_end += |
db94535d | 740 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
741 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
742 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
743 | path->slots[0]); | |
744 | item_end += btrfs_file_extent_inline_len(leaf, | |
745 | item); | |
39279cc3 | 746 | } |
008630c1 | 747 | item_end--; |
39279cc3 CM |
748 | } |
749 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
750 | ret = btrfs_csum_truncate(trans, root, path, | |
751 | inode->i_size); | |
752 | BUG_ON(ret); | |
753 | } | |
008630c1 | 754 | if (item_end < inode->i_size) { |
b888db2b CM |
755 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
756 | found_type = BTRFS_INODE_ITEM_KEY; | |
757 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
758 | found_type = BTRFS_CSUM_ITEM_KEY; | |
759 | } else if (found_type) { | |
760 | found_type--; | |
761 | } else { | |
762 | break; | |
39279cc3 | 763 | } |
a61721d5 | 764 | btrfs_set_key_type(&key, found_type); |
65555a06 | 765 | btrfs_release_path(root, path); |
b888db2b | 766 | continue; |
39279cc3 | 767 | } |
5f39d397 | 768 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
769 | del_item = 1; |
770 | else | |
771 | del_item = 0; | |
772 | found_extent = 0; | |
773 | ||
774 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
775 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
776 | goto delete; | |
777 | ||
778 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 779 | u64 num_dec; |
db94535d | 780 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 781 | if (!del_item) { |
db94535d CM |
782 | u64 orig_num_bytes = |
783 | btrfs_file_extent_num_bytes(leaf, fi); | |
784 | extent_num_bytes = inode->i_size - | |
5f39d397 | 785 | found_key.offset + root->sectorsize - 1; |
db94535d CM |
786 | btrfs_set_file_extent_num_bytes(leaf, fi, |
787 | extent_num_bytes); | |
788 | num_dec = (orig_num_bytes - | |
789 | extent_num_bytes) >> 9; | |
bab9fb03 Y |
790 | if (extent_start != 0) { |
791 | inode->i_blocks -= num_dec; | |
792 | } | |
5f39d397 | 793 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 794 | } else { |
db94535d CM |
795 | extent_num_bytes = |
796 | btrfs_file_extent_disk_num_bytes(leaf, | |
797 | fi); | |
39279cc3 | 798 | /* FIXME blocksize != 4096 */ |
db94535d CM |
799 | num_dec = btrfs_file_extent_num_bytes(leaf, |
800 | fi) >> 9; | |
39279cc3 CM |
801 | if (extent_start != 0) { |
802 | found_extent = 1; | |
803 | inode->i_blocks -= num_dec; | |
804 | } | |
d8d5f3e1 CM |
805 | root_gen = btrfs_header_generation(leaf); |
806 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 807 | } |
179e29e4 CM |
808 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE && |
809 | !del_item) { | |
810 | u32 newsize = inode->i_size - found_key.offset; | |
811 | newsize = btrfs_file_extent_calc_inline_size(newsize); | |
812 | ret = btrfs_truncate_item(trans, root, path, | |
813 | newsize, 1); | |
814 | BUG_ON(ret); | |
39279cc3 | 815 | } |
179e29e4 | 816 | delete: |
39279cc3 CM |
817 | if (del_item) { |
818 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
819 | if (ret) |
820 | goto error; | |
39279cc3 CM |
821 | } else { |
822 | break; | |
823 | } | |
824 | btrfs_release_path(root, path); | |
825 | if (found_extent) { | |
826 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 827 | extent_num_bytes, |
d8d5f3e1 | 828 | root_owner, |
7bb86316 CM |
829 | root_gen, inode->i_ino, |
830 | found_key.offset, 0); | |
39279cc3 CM |
831 | BUG_ON(ret); |
832 | } | |
833 | } | |
834 | ret = 0; | |
835 | error: | |
836 | btrfs_release_path(root, path); | |
837 | btrfs_free_path(path); | |
838 | inode->i_sb->s_dirt = 1; | |
839 | return ret; | |
840 | } | |
841 | ||
b888db2b | 842 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
843 | size_t zero_start) |
844 | { | |
845 | char *kaddr; | |
b888db2b | 846 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
1832a6d5 | 847 | struct btrfs_root *root = BTRFS_I(inode)->root; |
35ebb934 | 848 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 849 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1832a6d5 CM |
850 | u64 existing_delalloc; |
851 | u64 delalloc_start; | |
852 | int ret = 0; | |
a52d9a80 | 853 | |
190662b2 | 854 | WARN_ON(!PageLocked(page)); |
b3cfa35a | 855 | set_page_extent_mapped(page); |
a52d9a80 | 856 | |
b888db2b | 857 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
1832a6d5 CM |
858 | delalloc_start = page_start; |
859 | existing_delalloc = count_range_bits(&BTRFS_I(inode)->extent_tree, | |
860 | &delalloc_start, page_end, | |
861 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | |
b888db2b CM |
862 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, |
863 | page_end, GFP_NOFS); | |
1832a6d5 CM |
864 | |
865 | spin_lock(&root->fs_info->delalloc_lock); | |
866 | root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - existing_delalloc; | |
867 | spin_unlock(&root->fs_info->delalloc_lock); | |
868 | ||
a52d9a80 | 869 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 870 | kaddr = kmap(page); |
a52d9a80 CM |
871 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
872 | flush_dcache_page(page); | |
b888db2b | 873 | kunmap(page); |
a52d9a80 | 874 | } |
b888db2b CM |
875 | set_page_dirty(page); |
876 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 877 | |
a52d9a80 CM |
878 | return ret; |
879 | } | |
880 | ||
39279cc3 CM |
881 | /* |
882 | * taken from block_truncate_page, but does cow as it zeros out | |
883 | * any bytes left in the last page in the file. | |
884 | */ | |
885 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
886 | { | |
887 | struct inode *inode = mapping->host; | |
db94535d CM |
888 | struct btrfs_root *root = BTRFS_I(inode)->root; |
889 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
890 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
891 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
892 | struct page *page; | |
39279cc3 | 893 | int ret = 0; |
a52d9a80 | 894 | u64 page_start; |
39279cc3 CM |
895 | |
896 | if ((offset & (blocksize - 1)) == 0) | |
897 | goto out; | |
898 | ||
db94535d | 899 | down_read(&root->snap_sem); |
39279cc3 CM |
900 | ret = -ENOMEM; |
901 | page = grab_cache_page(mapping, index); | |
902 | if (!page) | |
903 | goto out; | |
39279cc3 | 904 | if (!PageUptodate(page)) { |
9ebefb18 | 905 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
906 | lock_page(page); |
907 | if (!PageUptodate(page)) { | |
908 | ret = -EIO; | |
909 | goto out; | |
910 | } | |
911 | } | |
35ebb934 | 912 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 913 | |
b888db2b | 914 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 915 | |
39279cc3 CM |
916 | unlock_page(page); |
917 | page_cache_release(page); | |
011410bd | 918 | up_read(&BTRFS_I(inode)->root->snap_sem); |
39279cc3 CM |
919 | out: |
920 | return ret; | |
921 | } | |
922 | ||
923 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
924 | { | |
925 | struct inode *inode = dentry->d_inode; | |
926 | int err; | |
927 | ||
928 | err = inode_change_ok(inode, attr); | |
929 | if (err) | |
930 | return err; | |
931 | ||
932 | if (S_ISREG(inode->i_mode) && | |
933 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
934 | struct btrfs_trans_handle *trans; | |
935 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2bf5a725 CM |
936 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
937 | ||
5f39d397 | 938 | u64 mask = root->sectorsize - 1; |
39279cc3 | 939 | u64 pos = (inode->i_size + mask) & ~mask; |
2bf5a725 | 940 | u64 block_end = attr->ia_size | mask; |
39279cc3 | 941 | u64 hole_size; |
179e29e4 | 942 | u64 alloc_hint = 0; |
39279cc3 CM |
943 | |
944 | if (attr->ia_size <= pos) | |
945 | goto out; | |
946 | ||
1832a6d5 CM |
947 | mutex_lock(&root->fs_info->fs_mutex); |
948 | err = btrfs_check_free_space(root, 1, 0); | |
949 | mutex_unlock(&root->fs_info->fs_mutex); | |
950 | if (err) | |
951 | goto fail; | |
952 | ||
39279cc3 CM |
953 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
954 | ||
2bf5a725 | 955 | lock_extent(em_tree, pos, block_end, GFP_NOFS); |
39279cc3 | 956 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
39279cc3 CM |
957 | |
958 | mutex_lock(&root->fs_info->fs_mutex); | |
959 | trans = btrfs_start_transaction(root, 1); | |
960 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 961 | err = btrfs_drop_extents(trans, root, inode, |
3326d1b0 CM |
962 | pos, pos + hole_size, pos, |
963 | &alloc_hint); | |
2bf5a725 | 964 | |
179e29e4 CM |
965 | if (alloc_hint != EXTENT_MAP_INLINE) { |
966 | err = btrfs_insert_file_extent(trans, root, | |
967 | inode->i_ino, | |
968 | pos, 0, 0, hole_size); | |
969 | } | |
39279cc3 CM |
970 | btrfs_end_transaction(trans, root); |
971 | mutex_unlock(&root->fs_info->fs_mutex); | |
2bf5a725 | 972 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
973 | if (err) |
974 | return err; | |
39279cc3 CM |
975 | } |
976 | out: | |
977 | err = inode_setattr(inode, attr); | |
1832a6d5 | 978 | fail: |
39279cc3 CM |
979 | return err; |
980 | } | |
981 | void btrfs_delete_inode(struct inode *inode) | |
982 | { | |
983 | struct btrfs_trans_handle *trans; | |
984 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 985 | unsigned long nr; |
39279cc3 CM |
986 | int ret; |
987 | ||
988 | truncate_inode_pages(&inode->i_data, 0); | |
989 | if (is_bad_inode(inode)) { | |
990 | goto no_delete; | |
991 | } | |
5f39d397 | 992 | |
39279cc3 CM |
993 | inode->i_size = 0; |
994 | mutex_lock(&root->fs_info->fs_mutex); | |
995 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 996 | |
39279cc3 CM |
997 | btrfs_set_trans_block_group(trans, inode); |
998 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
5103e947 JB |
999 | if (ret) |
1000 | goto no_delete_lock; | |
1001 | ret = btrfs_delete_xattrs(trans, root, inode); | |
54aa1f4d CM |
1002 | if (ret) |
1003 | goto no_delete_lock; | |
1004 | ret = btrfs_free_inode(trans, root, inode); | |
1005 | if (ret) | |
1006 | goto no_delete_lock; | |
d3c2fdcf | 1007 | nr = trans->blocks_used; |
5f39d397 | 1008 | |
39279cc3 CM |
1009 | btrfs_end_transaction(trans, root); |
1010 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1011 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 1012 | return; |
54aa1f4d CM |
1013 | |
1014 | no_delete_lock: | |
d3c2fdcf | 1015 | nr = trans->blocks_used; |
54aa1f4d CM |
1016 | btrfs_end_transaction(trans, root); |
1017 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1018 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1019 | no_delete: |
1020 | clear_inode(inode); | |
1021 | } | |
1022 | ||
1023 | /* | |
1024 | * this returns the key found in the dir entry in the location pointer. | |
1025 | * If no dir entries were found, location->objectid is 0. | |
1026 | */ | |
1027 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1028 | struct btrfs_key *location) | |
1029 | { | |
1030 | const char *name = dentry->d_name.name; | |
1031 | int namelen = dentry->d_name.len; | |
1032 | struct btrfs_dir_item *di; | |
1033 | struct btrfs_path *path; | |
1034 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1035 | int ret = 0; |
39279cc3 | 1036 | |
3954401f CM |
1037 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1038 | location->objectid = dir->i_ino; | |
1039 | location->type = BTRFS_INODE_ITEM_KEY; | |
1040 | location->offset = 0; | |
1041 | return 0; | |
1042 | } | |
39279cc3 CM |
1043 | path = btrfs_alloc_path(); |
1044 | BUG_ON(!path); | |
3954401f | 1045 | |
7a720536 | 1046 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1047 | struct btrfs_key key; |
1048 | struct extent_buffer *leaf; | |
1049 | u32 nritems; | |
1050 | int slot; | |
1051 | ||
1052 | key.objectid = dir->i_ino; | |
1053 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1054 | key.offset = 0; | |
1055 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1056 | BUG_ON(ret == 0); | |
1057 | ret = 0; | |
1058 | ||
1059 | leaf = path->nodes[0]; | |
1060 | slot = path->slots[0]; | |
1061 | nritems = btrfs_header_nritems(leaf); | |
1062 | if (slot >= nritems) | |
1063 | goto out_err; | |
1064 | ||
1065 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1066 | if (key.objectid != dir->i_ino || | |
1067 | key.type != BTRFS_INODE_REF_KEY) { | |
1068 | goto out_err; | |
1069 | } | |
1070 | location->objectid = key.offset; | |
1071 | location->type = BTRFS_INODE_ITEM_KEY; | |
1072 | location->offset = 0; | |
1073 | goto out; | |
1074 | } | |
1075 | ||
39279cc3 CM |
1076 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1077 | namelen, 0); | |
0d9f7f3e Y |
1078 | if (IS_ERR(di)) |
1079 | ret = PTR_ERR(di); | |
39279cc3 | 1080 | if (!di || IS_ERR(di)) { |
3954401f | 1081 | goto out_err; |
39279cc3 | 1082 | } |
5f39d397 | 1083 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1084 | out: |
39279cc3 CM |
1085 | btrfs_free_path(path); |
1086 | return ret; | |
3954401f CM |
1087 | out_err: |
1088 | location->objectid = 0; | |
1089 | goto out; | |
39279cc3 CM |
1090 | } |
1091 | ||
1092 | /* | |
1093 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1094 | * needs to be changed to reflect the root directory of the tree root. This | |
1095 | * is kind of like crossing a mount point. | |
1096 | */ | |
1097 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1098 | struct btrfs_key *location, | |
58176a96 JB |
1099 | struct btrfs_root **sub_root, |
1100 | struct dentry *dentry) | |
39279cc3 CM |
1101 | { |
1102 | struct btrfs_path *path; | |
1103 | struct btrfs_root_item *ri; | |
1104 | ||
1105 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1106 | return 0; | |
1107 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1108 | return 0; | |
1109 | ||
1110 | path = btrfs_alloc_path(); | |
1111 | BUG_ON(!path); | |
1112 | mutex_lock(&root->fs_info->fs_mutex); | |
1113 | ||
58176a96 JB |
1114 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1115 | dentry->d_name.name, | |
1116 | dentry->d_name.len); | |
39279cc3 CM |
1117 | if (IS_ERR(*sub_root)) |
1118 | return PTR_ERR(*sub_root); | |
1119 | ||
1120 | ri = &(*sub_root)->root_item; | |
1121 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1122 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1123 | location->offset = 0; | |
1124 | ||
1125 | btrfs_free_path(path); | |
1126 | mutex_unlock(&root->fs_info->fs_mutex); | |
1127 | return 0; | |
1128 | } | |
1129 | ||
1130 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1131 | { | |
1132 | struct btrfs_iget_args *args = p; | |
1133 | inode->i_ino = args->ino; | |
1134 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
1135 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1136 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
1137 | return 0; |
1138 | } | |
1139 | ||
1140 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1141 | { | |
1142 | struct btrfs_iget_args *args = opaque; | |
1143 | return (args->ino == inode->i_ino && | |
1144 | args->root == BTRFS_I(inode)->root); | |
1145 | } | |
1146 | ||
1147 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
1148 | struct btrfs_root *root) | |
1149 | { | |
1150 | struct inode *inode; | |
1151 | struct btrfs_iget_args args; | |
1152 | args.ino = objectid; | |
1153 | args.root = root; | |
1154 | ||
1155 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1156 | btrfs_init_locked_inode, | |
1157 | (void *)&args); | |
1158 | return inode; | |
1159 | } | |
1160 | ||
1161 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1162 | struct nameidata *nd) | |
1163 | { | |
1164 | struct inode * inode; | |
1165 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1166 | struct btrfs_root *root = bi->root; | |
1167 | struct btrfs_root *sub_root = root; | |
1168 | struct btrfs_key location; | |
1169 | int ret; | |
1170 | ||
1171 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1172 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1173 | |
39279cc3 CM |
1174 | mutex_lock(&root->fs_info->fs_mutex); |
1175 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1176 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1177 | |
39279cc3 CM |
1178 | if (ret < 0) |
1179 | return ERR_PTR(ret); | |
5f39d397 | 1180 | |
39279cc3 CM |
1181 | inode = NULL; |
1182 | if (location.objectid) { | |
58176a96 JB |
1183 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1184 | dentry); | |
39279cc3 CM |
1185 | if (ret < 0) |
1186 | return ERR_PTR(ret); | |
1187 | if (ret > 0) | |
1188 | return ERR_PTR(-ENOENT); | |
1189 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1190 | sub_root); | |
1191 | if (!inode) | |
1192 | return ERR_PTR(-EACCES); | |
1193 | if (inode->i_state & I_NEW) { | |
1194 | /* the inode and parent dir are two different roots */ | |
1195 | if (sub_root != root) { | |
1196 | igrab(inode); | |
1197 | sub_root->inode = inode; | |
1198 | } | |
1199 | BTRFS_I(inode)->root = sub_root; | |
1200 | memcpy(&BTRFS_I(inode)->location, &location, | |
1201 | sizeof(location)); | |
1202 | btrfs_read_locked_inode(inode); | |
1203 | unlock_new_inode(inode); | |
1204 | } | |
1205 | } | |
1206 | return d_splice_alias(inode, dentry); | |
1207 | } | |
1208 | ||
39279cc3 CM |
1209 | static unsigned char btrfs_filetype_table[] = { |
1210 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1211 | }; | |
1212 | ||
1213 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1214 | { | |
6da6abae | 1215 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1216 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1217 | struct btrfs_item *item; | |
1218 | struct btrfs_dir_item *di; | |
1219 | struct btrfs_key key; | |
5f39d397 | 1220 | struct btrfs_key found_key; |
39279cc3 CM |
1221 | struct btrfs_path *path; |
1222 | int ret; | |
1223 | u32 nritems; | |
5f39d397 | 1224 | struct extent_buffer *leaf; |
39279cc3 CM |
1225 | int slot; |
1226 | int advance; | |
1227 | unsigned char d_type; | |
1228 | int over = 0; | |
1229 | u32 di_cur; | |
1230 | u32 di_total; | |
1231 | u32 di_len; | |
1232 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1233 | char tmp_name[32]; |
1234 | char *name_ptr; | |
1235 | int name_len; | |
39279cc3 CM |
1236 | |
1237 | /* FIXME, use a real flag for deciding about the key type */ | |
1238 | if (root->fs_info->tree_root == root) | |
1239 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1240 | |
3954401f CM |
1241 | /* special case for "." */ |
1242 | if (filp->f_pos == 0) { | |
1243 | over = filldir(dirent, ".", 1, | |
1244 | 1, inode->i_ino, | |
1245 | DT_DIR); | |
1246 | if (over) | |
1247 | return 0; | |
1248 | filp->f_pos = 1; | |
1249 | } | |
1250 | ||
39279cc3 CM |
1251 | mutex_lock(&root->fs_info->fs_mutex); |
1252 | key.objectid = inode->i_ino; | |
3954401f CM |
1253 | path = btrfs_alloc_path(); |
1254 | path->reada = 2; | |
1255 | ||
1256 | /* special case for .., just use the back ref */ | |
1257 | if (filp->f_pos == 1) { | |
1258 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1259 | key.offset = 0; | |
1260 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1261 | BUG_ON(ret == 0); | |
1262 | leaf = path->nodes[0]; | |
1263 | slot = path->slots[0]; | |
1264 | nritems = btrfs_header_nritems(leaf); | |
1265 | if (slot >= nritems) { | |
1266 | btrfs_release_path(root, path); | |
1267 | goto read_dir_items; | |
1268 | } | |
1269 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1270 | btrfs_release_path(root, path); | |
1271 | if (found_key.objectid != key.objectid || | |
1272 | found_key.type != BTRFS_INODE_REF_KEY) | |
1273 | goto read_dir_items; | |
1274 | over = filldir(dirent, "..", 2, | |
1275 | 2, found_key.offset, DT_DIR); | |
1276 | if (over) | |
1277 | goto nopos; | |
1278 | filp->f_pos = 2; | |
1279 | } | |
1280 | ||
1281 | read_dir_items: | |
39279cc3 CM |
1282 | btrfs_set_key_type(&key, key_type); |
1283 | key.offset = filp->f_pos; | |
5f39d397 | 1284 | |
39279cc3 CM |
1285 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1286 | if (ret < 0) | |
1287 | goto err; | |
1288 | advance = 0; | |
39279cc3 | 1289 | while(1) { |
5f39d397 CM |
1290 | leaf = path->nodes[0]; |
1291 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1292 | slot = path->slots[0]; |
1293 | if (advance || slot >= nritems) { | |
1294 | if (slot >= nritems -1) { | |
39279cc3 CM |
1295 | ret = btrfs_next_leaf(root, path); |
1296 | if (ret) | |
1297 | break; | |
5f39d397 CM |
1298 | leaf = path->nodes[0]; |
1299 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1300 | slot = path->slots[0]; |
1301 | } else { | |
1302 | slot++; | |
1303 | path->slots[0]++; | |
1304 | } | |
1305 | } | |
1306 | advance = 1; | |
5f39d397 CM |
1307 | item = btrfs_item_nr(leaf, slot); |
1308 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1309 | ||
1310 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1311 | break; |
5f39d397 | 1312 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1313 | break; |
5f39d397 | 1314 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1315 | continue; |
5f39d397 CM |
1316 | |
1317 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1318 | advance = 1; |
1319 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1320 | di_cur = 0; | |
5f39d397 | 1321 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1322 | while(di_cur < di_total) { |
5f39d397 CM |
1323 | struct btrfs_key location; |
1324 | ||
1325 | name_len = btrfs_dir_name_len(leaf, di); | |
1326 | if (name_len < 32) { | |
1327 | name_ptr = tmp_name; | |
1328 | } else { | |
1329 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1330 | BUG_ON(!name_ptr); | |
1331 | } | |
1332 | read_extent_buffer(leaf, name_ptr, | |
1333 | (unsigned long)(di + 1), name_len); | |
1334 | ||
1335 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1336 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
1337 | ||
1338 | over = filldir(dirent, name_ptr, name_len, | |
1339 | found_key.offset, | |
1340 | location.objectid, | |
39279cc3 | 1341 | d_type); |
5f39d397 CM |
1342 | |
1343 | if (name_ptr != tmp_name) | |
1344 | kfree(name_ptr); | |
1345 | ||
39279cc3 CM |
1346 | if (over) |
1347 | goto nopos; | |
5103e947 JB |
1348 | di_len = btrfs_dir_name_len(leaf, di) + |
1349 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1350 | di_cur += di_len; |
1351 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1352 | } | |
1353 | } | |
1354 | filp->f_pos++; | |
1355 | nopos: | |
1356 | ret = 0; | |
1357 | err: | |
1358 | btrfs_release_path(root, path); | |
1359 | btrfs_free_path(path); | |
1360 | mutex_unlock(&root->fs_info->fs_mutex); | |
1361 | return ret; | |
1362 | } | |
1363 | ||
1364 | int btrfs_write_inode(struct inode *inode, int wait) | |
1365 | { | |
1366 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1367 | struct btrfs_trans_handle *trans; | |
1368 | int ret = 0; | |
1369 | ||
1370 | if (wait) { | |
1371 | mutex_lock(&root->fs_info->fs_mutex); | |
1372 | trans = btrfs_start_transaction(root, 1); | |
1373 | btrfs_set_trans_block_group(trans, inode); | |
1374 | ret = btrfs_commit_transaction(trans, root); | |
1375 | mutex_unlock(&root->fs_info->fs_mutex); | |
1376 | } | |
1377 | return ret; | |
1378 | } | |
1379 | ||
1380 | /* | |
54aa1f4d | 1381 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1382 | * inode changes. But, it is most likely to find the inode in cache. |
1383 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1384 | * to keep or drop this code. | |
1385 | */ | |
1386 | void btrfs_dirty_inode(struct inode *inode) | |
1387 | { | |
1388 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1389 | struct btrfs_trans_handle *trans; | |
1390 | ||
1391 | mutex_lock(&root->fs_info->fs_mutex); | |
1392 | trans = btrfs_start_transaction(root, 1); | |
1393 | btrfs_set_trans_block_group(trans, inode); | |
1394 | btrfs_update_inode(trans, root, inode); | |
1395 | btrfs_end_transaction(trans, root); | |
1396 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1397 | } |
1398 | ||
1399 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1400 | struct btrfs_root *root, | |
1401 | u64 objectid, | |
1402 | struct btrfs_block_group_cache *group, | |
1403 | int mode) | |
1404 | { | |
1405 | struct inode *inode; | |
5f39d397 | 1406 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1407 | struct btrfs_key *location; |
5f39d397 | 1408 | struct btrfs_path *path; |
39279cc3 CM |
1409 | int ret; |
1410 | int owner; | |
1411 | ||
5f39d397 CM |
1412 | path = btrfs_alloc_path(); |
1413 | BUG_ON(!path); | |
1414 | ||
39279cc3 CM |
1415 | inode = new_inode(root->fs_info->sb); |
1416 | if (!inode) | |
1417 | return ERR_PTR(-ENOMEM); | |
1418 | ||
b888db2b CM |
1419 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1420 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 1421 | BTRFS_I(inode)->root = root; |
b888db2b | 1422 | |
39279cc3 CM |
1423 | if (mode & S_IFDIR) |
1424 | owner = 0; | |
1425 | else | |
1426 | owner = 1; | |
1427 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1428 | BTRFS_I(inode)->block_group = group; | |
1429 | ||
5f39d397 CM |
1430 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
1431 | if (ret) | |
1432 | goto fail; | |
1433 | ||
39279cc3 CM |
1434 | inode->i_uid = current->fsuid; |
1435 | inode->i_gid = current->fsgid; | |
1436 | inode->i_mode = mode; | |
1437 | inode->i_ino = objectid; | |
1438 | inode->i_blocks = 0; | |
1439 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1440 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1441 | struct btrfs_inode_item); | |
1442 | fill_inode_item(path->nodes[0], inode_item, inode); | |
1443 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1444 | btrfs_free_path(path); | |
1445 | ||
39279cc3 CM |
1446 | location = &BTRFS_I(inode)->location; |
1447 | location->objectid = objectid; | |
39279cc3 CM |
1448 | location->offset = 0; |
1449 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1450 | ||
39279cc3 CM |
1451 | insert_inode_hash(inode); |
1452 | return inode; | |
5f39d397 CM |
1453 | fail: |
1454 | btrfs_free_path(path); | |
1455 | return ERR_PTR(ret); | |
39279cc3 CM |
1456 | } |
1457 | ||
1458 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1459 | { | |
1460 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1461 | } | |
1462 | ||
1463 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1464 | struct dentry *dentry, struct inode *inode) | |
1465 | { | |
1466 | int ret; | |
1467 | struct btrfs_key key; | |
1468 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1469 | struct inode *parent_inode; |
5f39d397 | 1470 | |
39279cc3 | 1471 | key.objectid = inode->i_ino; |
39279cc3 CM |
1472 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1473 | key.offset = 0; | |
1474 | ||
1475 | ret = btrfs_insert_dir_item(trans, root, | |
1476 | dentry->d_name.name, dentry->d_name.len, | |
1477 | dentry->d_parent->d_inode->i_ino, | |
1478 | &key, btrfs_inode_type(inode)); | |
1479 | if (ret == 0) { | |
76fea00a CM |
1480 | ret = btrfs_insert_inode_ref(trans, root, |
1481 | dentry->d_name.name, | |
1482 | dentry->d_name.len, | |
1483 | inode->i_ino, | |
1484 | dentry->d_parent->d_inode->i_ino); | |
79c44584 CM |
1485 | parent_inode = dentry->d_parent->d_inode; |
1486 | parent_inode->i_size += dentry->d_name.len * 2; | |
1487 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1488 | ret = btrfs_update_inode(trans, root, |
1489 | dentry->d_parent->d_inode); | |
1490 | } | |
1491 | return ret; | |
1492 | } | |
1493 | ||
1494 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1495 | struct dentry *dentry, struct inode *inode) | |
1496 | { | |
1497 | int err = btrfs_add_link(trans, dentry, inode); | |
1498 | if (!err) { | |
1499 | d_instantiate(dentry, inode); | |
1500 | return 0; | |
1501 | } | |
1502 | if (err > 0) | |
1503 | err = -EEXIST; | |
1504 | return err; | |
1505 | } | |
1506 | ||
618e21d5 JB |
1507 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1508 | int mode, dev_t rdev) | |
1509 | { | |
1510 | struct btrfs_trans_handle *trans; | |
1511 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1512 | struct inode *inode = NULL; |
618e21d5 JB |
1513 | int err; |
1514 | int drop_inode = 0; | |
1515 | u64 objectid; | |
1832a6d5 | 1516 | unsigned long nr = 0; |
618e21d5 JB |
1517 | |
1518 | if (!new_valid_dev(rdev)) | |
1519 | return -EINVAL; | |
1520 | ||
1521 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1522 | err = btrfs_check_free_space(root, 1, 0); |
1523 | if (err) | |
1524 | goto fail; | |
1525 | ||
618e21d5 JB |
1526 | trans = btrfs_start_transaction(root, 1); |
1527 | btrfs_set_trans_block_group(trans, dir); | |
1528 | ||
1529 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1530 | if (err) { | |
1531 | err = -ENOSPC; | |
1532 | goto out_unlock; | |
1533 | } | |
1534 | ||
1535 | inode = btrfs_new_inode(trans, root, objectid, | |
1536 | BTRFS_I(dir)->block_group, mode); | |
1537 | err = PTR_ERR(inode); | |
1538 | if (IS_ERR(inode)) | |
1539 | goto out_unlock; | |
1540 | ||
1541 | btrfs_set_trans_block_group(trans, inode); | |
1542 | err = btrfs_add_nondir(trans, dentry, inode); | |
1543 | if (err) | |
1544 | drop_inode = 1; | |
1545 | else { | |
1546 | inode->i_op = &btrfs_special_inode_operations; | |
1547 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1548 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1549 | } |
1550 | dir->i_sb->s_dirt = 1; | |
1551 | btrfs_update_inode_block_group(trans, inode); | |
1552 | btrfs_update_inode_block_group(trans, dir); | |
1553 | out_unlock: | |
d3c2fdcf | 1554 | nr = trans->blocks_used; |
618e21d5 | 1555 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1556 | fail: |
618e21d5 JB |
1557 | mutex_unlock(&root->fs_info->fs_mutex); |
1558 | ||
1559 | if (drop_inode) { | |
1560 | inode_dec_link_count(inode); | |
1561 | iput(inode); | |
1562 | } | |
d3c2fdcf | 1563 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
1564 | return err; |
1565 | } | |
1566 | ||
39279cc3 CM |
1567 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1568 | int mode, struct nameidata *nd) | |
1569 | { | |
1570 | struct btrfs_trans_handle *trans; | |
1571 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1572 | struct inode *inode = NULL; |
39279cc3 CM |
1573 | int err; |
1574 | int drop_inode = 0; | |
1832a6d5 | 1575 | unsigned long nr = 0; |
39279cc3 CM |
1576 | u64 objectid; |
1577 | ||
1578 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1579 | err = btrfs_check_free_space(root, 1, 0); |
1580 | if (err) | |
1581 | goto fail; | |
39279cc3 CM |
1582 | trans = btrfs_start_transaction(root, 1); |
1583 | btrfs_set_trans_block_group(trans, dir); | |
1584 | ||
1585 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1586 | if (err) { | |
1587 | err = -ENOSPC; | |
1588 | goto out_unlock; | |
1589 | } | |
1590 | ||
1591 | inode = btrfs_new_inode(trans, root, objectid, | |
1592 | BTRFS_I(dir)->block_group, mode); | |
1593 | err = PTR_ERR(inode); | |
1594 | if (IS_ERR(inode)) | |
1595 | goto out_unlock; | |
1596 | ||
1597 | btrfs_set_trans_block_group(trans, inode); | |
1598 | err = btrfs_add_nondir(trans, dentry, inode); | |
1599 | if (err) | |
1600 | drop_inode = 1; | |
1601 | else { | |
1602 | inode->i_mapping->a_ops = &btrfs_aops; | |
1603 | inode->i_fop = &btrfs_file_operations; | |
1604 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1605 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1606 | inode->i_mapping, GFP_NOFS); | |
07157aac | 1607 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
1608 | } |
1609 | dir->i_sb->s_dirt = 1; | |
1610 | btrfs_update_inode_block_group(trans, inode); | |
1611 | btrfs_update_inode_block_group(trans, dir); | |
1612 | out_unlock: | |
d3c2fdcf | 1613 | nr = trans->blocks_used; |
39279cc3 | 1614 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1615 | fail: |
39279cc3 CM |
1616 | mutex_unlock(&root->fs_info->fs_mutex); |
1617 | ||
1618 | if (drop_inode) { | |
1619 | inode_dec_link_count(inode); | |
1620 | iput(inode); | |
1621 | } | |
d3c2fdcf | 1622 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1623 | return err; |
1624 | } | |
1625 | ||
1626 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1627 | struct dentry *dentry) | |
1628 | { | |
1629 | struct btrfs_trans_handle *trans; | |
1630 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1631 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 1632 | unsigned long nr = 0; |
39279cc3 CM |
1633 | int err; |
1634 | int drop_inode = 0; | |
1635 | ||
1636 | if (inode->i_nlink == 0) | |
1637 | return -ENOENT; | |
1638 | ||
6da6abae CM |
1639 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1640 | inode->i_nlink++; | |
1641 | #else | |
39279cc3 | 1642 | inc_nlink(inode); |
6da6abae | 1643 | #endif |
39279cc3 | 1644 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
1645 | err = btrfs_check_free_space(root, 1, 0); |
1646 | if (err) | |
1647 | goto fail; | |
39279cc3 | 1648 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1649 | |
39279cc3 CM |
1650 | btrfs_set_trans_block_group(trans, dir); |
1651 | atomic_inc(&inode->i_count); | |
1652 | err = btrfs_add_nondir(trans, dentry, inode); | |
5f39d397 | 1653 | |
39279cc3 CM |
1654 | if (err) |
1655 | drop_inode = 1; | |
5f39d397 | 1656 | |
39279cc3 CM |
1657 | dir->i_sb->s_dirt = 1; |
1658 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1659 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1660 | |
54aa1f4d CM |
1661 | if (err) |
1662 | drop_inode = 1; | |
39279cc3 | 1663 | |
d3c2fdcf | 1664 | nr = trans->blocks_used; |
39279cc3 | 1665 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1666 | fail: |
39279cc3 CM |
1667 | mutex_unlock(&root->fs_info->fs_mutex); |
1668 | ||
1669 | if (drop_inode) { | |
1670 | inode_dec_link_count(inode); | |
1671 | iput(inode); | |
1672 | } | |
d3c2fdcf | 1673 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1674 | return err; |
1675 | } | |
1676 | ||
39279cc3 CM |
1677 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
1678 | { | |
1679 | struct inode *inode; | |
1680 | struct btrfs_trans_handle *trans; | |
1681 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1682 | int err = 0; | |
1683 | int drop_on_err = 0; | |
1684 | u64 objectid; | |
d3c2fdcf | 1685 | unsigned long nr = 1; |
39279cc3 CM |
1686 | |
1687 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1688 | err = btrfs_check_free_space(root, 1, 0); |
1689 | if (err) | |
1690 | goto out_unlock; | |
1691 | ||
39279cc3 CM |
1692 | trans = btrfs_start_transaction(root, 1); |
1693 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1694 | |
39279cc3 CM |
1695 | if (IS_ERR(trans)) { |
1696 | err = PTR_ERR(trans); | |
1697 | goto out_unlock; | |
1698 | } | |
1699 | ||
1700 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1701 | if (err) { | |
1702 | err = -ENOSPC; | |
1703 | goto out_unlock; | |
1704 | } | |
1705 | ||
1706 | inode = btrfs_new_inode(trans, root, objectid, | |
1707 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1708 | if (IS_ERR(inode)) { | |
1709 | err = PTR_ERR(inode); | |
1710 | goto out_fail; | |
1711 | } | |
5f39d397 | 1712 | |
39279cc3 CM |
1713 | drop_on_err = 1; |
1714 | inode->i_op = &btrfs_dir_inode_operations; | |
1715 | inode->i_fop = &btrfs_dir_file_operations; | |
1716 | btrfs_set_trans_block_group(trans, inode); | |
1717 | ||
3954401f | 1718 | inode->i_size = 0; |
39279cc3 CM |
1719 | err = btrfs_update_inode(trans, root, inode); |
1720 | if (err) | |
1721 | goto out_fail; | |
5f39d397 | 1722 | |
39279cc3 CM |
1723 | err = btrfs_add_link(trans, dentry, inode); |
1724 | if (err) | |
1725 | goto out_fail; | |
5f39d397 | 1726 | |
39279cc3 CM |
1727 | d_instantiate(dentry, inode); |
1728 | drop_on_err = 0; | |
1729 | dir->i_sb->s_dirt = 1; | |
1730 | btrfs_update_inode_block_group(trans, inode); | |
1731 | btrfs_update_inode_block_group(trans, dir); | |
1732 | ||
1733 | out_fail: | |
d3c2fdcf | 1734 | nr = trans->blocks_used; |
39279cc3 | 1735 | btrfs_end_transaction(trans, root); |
5f39d397 | 1736 | |
39279cc3 CM |
1737 | out_unlock: |
1738 | mutex_unlock(&root->fs_info->fs_mutex); | |
1739 | if (drop_on_err) | |
1740 | iput(inode); | |
d3c2fdcf | 1741 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1742 | return err; |
1743 | } | |
1744 | ||
a52d9a80 CM |
1745 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1746 | size_t page_offset, u64 start, u64 end, | |
1747 | int create) | |
1748 | { | |
1749 | int ret; | |
1750 | int err = 0; | |
db94535d | 1751 | u64 bytenr; |
a52d9a80 CM |
1752 | u64 extent_start = 0; |
1753 | u64 extent_end = 0; | |
1754 | u64 objectid = inode->i_ino; | |
1755 | u32 found_type; | |
1756 | int failed_insert = 0; | |
1757 | struct btrfs_path *path; | |
1758 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1759 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1760 | struct extent_buffer *leaf; |
1761 | struct btrfs_key found_key; | |
a52d9a80 CM |
1762 | struct extent_map *em = NULL; |
1763 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1764 | struct btrfs_trans_handle *trans = NULL; | |
1765 | ||
1766 | path = btrfs_alloc_path(); | |
1767 | BUG_ON(!path); | |
1768 | mutex_lock(&root->fs_info->fs_mutex); | |
1769 | ||
1770 | again: | |
1771 | em = lookup_extent_mapping(em_tree, start, end); | |
1772 | if (em) { | |
56b453c9 CM |
1773 | if (em->start > start) { |
1774 | printk("get_extent start %Lu em start %Lu\n", | |
1775 | start, em->start); | |
1776 | WARN_ON(1); | |
1777 | } | |
a52d9a80 CM |
1778 | goto out; |
1779 | } | |
1780 | if (!em) { | |
1781 | em = alloc_extent_map(GFP_NOFS); | |
1782 | if (!em) { | |
1783 | err = -ENOMEM; | |
1784 | goto out; | |
1785 | } | |
5f39d397 CM |
1786 | em->start = EXTENT_MAP_HOLE; |
1787 | em->end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1788 | } |
1789 | em->bdev = inode->i_sb->s_bdev; | |
179e29e4 CM |
1790 | ret = btrfs_lookup_file_extent(trans, root, path, |
1791 | objectid, start, trans != NULL); | |
a52d9a80 CM |
1792 | if (ret < 0) { |
1793 | err = ret; | |
1794 | goto out; | |
1795 | } | |
1796 | ||
1797 | if (ret != 0) { | |
1798 | if (path->slots[0] == 0) | |
1799 | goto not_found; | |
1800 | path->slots[0]--; | |
1801 | } | |
1802 | ||
5f39d397 CM |
1803 | leaf = path->nodes[0]; |
1804 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1805 | struct btrfs_file_extent_item); |
a52d9a80 | 1806 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1807 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1808 | found_type = btrfs_key_type(&found_key); | |
1809 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1810 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1811 | goto not_found; | |
1812 | } | |
1813 | ||
5f39d397 CM |
1814 | found_type = btrfs_file_extent_type(leaf, item); |
1815 | extent_start = found_key.offset; | |
a52d9a80 CM |
1816 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1817 | extent_end = extent_start + | |
db94535d | 1818 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1819 | err = 0; |
b888db2b | 1820 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1821 | em->start = start; |
1822 | if (start < extent_start) { | |
b888db2b CM |
1823 | if (end < extent_start) |
1824 | goto not_found; | |
a52d9a80 CM |
1825 | em->end = extent_end - 1; |
1826 | } else { | |
1827 | em->end = end; | |
1828 | } | |
1829 | goto not_found_em; | |
1830 | } | |
db94535d CM |
1831 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1832 | if (bytenr == 0) { | |
a52d9a80 CM |
1833 | em->start = extent_start; |
1834 | em->end = extent_end - 1; | |
5f39d397 CM |
1835 | em->block_start = EXTENT_MAP_HOLE; |
1836 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1837 | goto insert; |
1838 | } | |
db94535d CM |
1839 | bytenr += btrfs_file_extent_offset(leaf, item); |
1840 | em->block_start = bytenr; | |
a52d9a80 | 1841 | em->block_end = em->block_start + |
db94535d | 1842 | btrfs_file_extent_num_bytes(leaf, item) - 1; |
a52d9a80 CM |
1843 | em->start = extent_start; |
1844 | em->end = extent_end - 1; | |
1845 | goto insert; | |
1846 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1847 | unsigned long ptr; |
a52d9a80 | 1848 | char *map; |
3326d1b0 CM |
1849 | size_t size; |
1850 | size_t extent_offset; | |
1851 | size_t copy_size; | |
a52d9a80 | 1852 | |
5f39d397 CM |
1853 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1854 | path->slots[0])); | |
689f9346 | 1855 | extent_end = (extent_start + size - 1) | |
db94535d | 1856 | ((u64)root->sectorsize - 1); |
b888db2b | 1857 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1858 | em->start = start; |
1859 | if (start < extent_start) { | |
b888db2b CM |
1860 | if (end < extent_start) |
1861 | goto not_found; | |
50b78c24 | 1862 | em->end = extent_end; |
a52d9a80 CM |
1863 | } else { |
1864 | em->end = end; | |
1865 | } | |
1866 | goto not_found_em; | |
1867 | } | |
689f9346 Y |
1868 | em->block_start = EXTENT_MAP_INLINE; |
1869 | em->block_end = EXTENT_MAP_INLINE; | |
1870 | ||
1871 | if (!page) { | |
1872 | em->start = extent_start; | |
1873 | em->end = extent_start + size - 1; | |
1874 | goto out; | |
1875 | } | |
5f39d397 | 1876 | |
35ebb934 | 1877 | extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) - |
689f9346 | 1878 | extent_start + page_offset; |
ae2f5411 | 1879 | copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset, |
3326d1b0 | 1880 | size - extent_offset); |
3326d1b0 CM |
1881 | em->start = extent_start + extent_offset; |
1882 | em->end = (em->start + copy_size -1) | | |
1883 | ((u64)root->sectorsize -1); | |
689f9346 Y |
1884 | map = kmap(page); |
1885 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 CM |
1886 | if (create == 0 && !PageUptodate(page)) { |
1887 | read_extent_buffer(leaf, map + page_offset, ptr, | |
1888 | copy_size); | |
1889 | flush_dcache_page(page); | |
1890 | } else if (create && PageUptodate(page)) { | |
1891 | if (!trans) { | |
1892 | kunmap(page); | |
1893 | free_extent_map(em); | |
1894 | em = NULL; | |
1895 | btrfs_release_path(root, path); | |
1896 | trans = btrfs_start_transaction(root, 1); | |
1897 | goto again; | |
1898 | } | |
1899 | write_extent_buffer(leaf, map + page_offset, ptr, | |
1900 | copy_size); | |
1901 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 1902 | } |
a52d9a80 | 1903 | kunmap(page); |
3326d1b0 | 1904 | set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS); |
a52d9a80 CM |
1905 | goto insert; |
1906 | } else { | |
1907 | printk("unkknown found_type %d\n", found_type); | |
1908 | WARN_ON(1); | |
1909 | } | |
1910 | not_found: | |
1911 | em->start = start; | |
1912 | em->end = end; | |
1913 | not_found_em: | |
5f39d397 CM |
1914 | em->block_start = EXTENT_MAP_HOLE; |
1915 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1916 | insert: |
1917 | btrfs_release_path(root, path); | |
1918 | if (em->start > start || em->end < start) { | |
b888db2b | 1919 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1920 | err = -EIO; |
1921 | goto out; | |
1922 | } | |
1923 | ret = add_extent_mapping(em_tree, em); | |
1924 | if (ret == -EEXIST) { | |
1925 | free_extent_map(em); | |
2bf5a725 | 1926 | em = NULL; |
6da6abae CM |
1927 | if (0 && failed_insert == 1) { |
1928 | btrfs_drop_extent_cache(inode, start, end); | |
1929 | } | |
a52d9a80 CM |
1930 | failed_insert++; |
1931 | if (failed_insert > 5) { | |
1932 | printk("failing to insert %Lu %Lu\n", start, end); | |
1933 | err = -EIO; | |
1934 | goto out; | |
1935 | } | |
a52d9a80 CM |
1936 | goto again; |
1937 | } | |
1938 | err = 0; | |
1939 | out: | |
1940 | btrfs_free_path(path); | |
1941 | if (trans) { | |
1942 | ret = btrfs_end_transaction(trans, root); | |
1943 | if (!err) | |
1944 | err = ret; | |
1945 | } | |
1946 | mutex_unlock(&root->fs_info->fs_mutex); | |
1947 | if (err) { | |
1948 | free_extent_map(em); | |
1949 | WARN_ON(1); | |
1950 | return ERR_PTR(err); | |
1951 | } | |
1952 | return em; | |
1953 | } | |
1954 | ||
d396c6f5 | 1955 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 1956 | { |
d396c6f5 | 1957 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
1958 | } |
1959 | ||
a52d9a80 | 1960 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1961 | { |
a52d9a80 CM |
1962 | struct extent_map_tree *tree; |
1963 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1964 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1965 | } |
1832a6d5 | 1966 | |
a52d9a80 | 1967 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 1968 | { |
a52d9a80 | 1969 | struct extent_map_tree *tree; |
b888db2b CM |
1970 | |
1971 | ||
1972 | if (current->flags & PF_MEMALLOC) { | |
1973 | redirty_page_for_writepage(wbc, page); | |
1974 | unlock_page(page); | |
1975 | return 0; | |
1976 | } | |
a52d9a80 CM |
1977 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
1978 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
1979 | } |
1980 | ||
b293f02e CM |
1981 | static int btrfs_writepages(struct address_space *mapping, |
1982 | struct writeback_control *wbc) | |
1983 | { | |
1984 | struct extent_map_tree *tree; | |
1985 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
1986 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); | |
1987 | } | |
1988 | ||
3ab2fb5a CM |
1989 | static int |
1990 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
1991 | struct list_head *pages, unsigned nr_pages) | |
1992 | { | |
1993 | struct extent_map_tree *tree; | |
1994 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
1995 | return extent_readpages(tree, mapping, pages, nr_pages, | |
1996 | btrfs_get_extent); | |
1997 | } | |
1998 | ||
a52d9a80 | 1999 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 2000 | { |
a52d9a80 CM |
2001 | struct extent_map_tree *tree; |
2002 | int ret; | |
8c2383c3 | 2003 | |
a52d9a80 CM |
2004 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
2005 | ret = try_release_extent_mapping(tree, page); | |
2006 | if (ret == 1) { | |
2007 | ClearPagePrivate(page); | |
2008 | set_page_private(page, 0); | |
2009 | page_cache_release(page); | |
39279cc3 | 2010 | } |
a52d9a80 | 2011 | return ret; |
39279cc3 CM |
2012 | } |
2013 | ||
a52d9a80 | 2014 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2015 | { |
a52d9a80 | 2016 | struct extent_map_tree *tree; |
39279cc3 | 2017 | |
a52d9a80 CM |
2018 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
2019 | extent_invalidatepage(tree, page, offset); | |
2020 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
2021 | } |
2022 | ||
9ebefb18 CM |
2023 | /* |
2024 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2025 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2026 | * be careful to check for EOF conditions here. We set the page up correctly | |
2027 | * for a written page which means we get ENOSPC checking when writing into | |
2028 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2029 | * support these features. | |
2030 | * | |
2031 | * We are not allowed to take the i_mutex here so we have to play games to | |
2032 | * protect against truncate races as the page could now be beyond EOF. Because | |
2033 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2034 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2035 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2036 | * unlock the page. | |
2037 | */ | |
2038 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2039 | { | |
6da6abae | 2040 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2041 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9ebefb18 CM |
2042 | unsigned long end; |
2043 | loff_t size; | |
1832a6d5 | 2044 | int ret; |
a52d9a80 | 2045 | u64 page_start; |
9ebefb18 | 2046 | |
1832a6d5 CM |
2047 | mutex_lock(&root->fs_info->fs_mutex); |
2048 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); | |
8f662a76 | 2049 | mutex_unlock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2050 | if (ret) |
2051 | goto out; | |
2052 | ||
2053 | ret = -EINVAL; | |
2054 | ||
011410bd | 2055 | down_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 CM |
2056 | lock_page(page); |
2057 | wait_on_page_writeback(page); | |
9ebefb18 | 2058 | size = i_size_read(inode); |
35ebb934 | 2059 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 2060 | |
9ebefb18 | 2061 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 2062 | (page_start > size)) { |
9ebefb18 CM |
2063 | /* page got truncated out from underneath us */ |
2064 | goto out_unlock; | |
2065 | } | |
2066 | ||
2067 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2068 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
2069 | end = size & ~PAGE_CACHE_MASK; |
2070 | else | |
2071 | end = PAGE_CACHE_SIZE; | |
2072 | ||
b888db2b | 2073 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
2074 | |
2075 | out_unlock: | |
011410bd | 2076 | up_read(&BTRFS_I(inode)->root->snap_sem); |
9ebefb18 | 2077 | unlock_page(page); |
1832a6d5 | 2078 | out: |
9ebefb18 CM |
2079 | return ret; |
2080 | } | |
2081 | ||
39279cc3 CM |
2082 | static void btrfs_truncate(struct inode *inode) |
2083 | { | |
2084 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2085 | int ret; | |
2086 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2087 | unsigned long nr; |
39279cc3 CM |
2088 | |
2089 | if (!S_ISREG(inode->i_mode)) | |
2090 | return; | |
2091 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2092 | return; | |
2093 | ||
2094 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2095 | ||
2096 | mutex_lock(&root->fs_info->fs_mutex); | |
2097 | trans = btrfs_start_transaction(root, 1); | |
2098 | btrfs_set_trans_block_group(trans, inode); | |
2099 | ||
2100 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
2101 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 | 2102 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2103 | nr = trans->blocks_used; |
5f39d397 | 2104 | |
39279cc3 CM |
2105 | ret = btrfs_end_transaction(trans, root); |
2106 | BUG_ON(ret); | |
2107 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2108 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2109 | } |
2110 | ||
4313b399 CM |
2111 | static int noinline create_subvol(struct btrfs_root *root, char *name, |
2112 | int namelen) | |
39279cc3 CM |
2113 | { |
2114 | struct btrfs_trans_handle *trans; | |
2115 | struct btrfs_key key; | |
2116 | struct btrfs_root_item root_item; | |
2117 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2118 | struct extent_buffer *leaf; |
39279cc3 CM |
2119 | struct btrfs_root *new_root; |
2120 | struct inode *inode; | |
2121 | struct inode *dir; | |
2122 | int ret; | |
54aa1f4d | 2123 | int err; |
39279cc3 CM |
2124 | u64 objectid; |
2125 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2126 | unsigned long nr = 1; |
39279cc3 CM |
2127 | |
2128 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2129 | ret = btrfs_check_free_space(root, 1, 0); |
2130 | if (ret) | |
2131 | goto fail_commit; | |
2132 | ||
39279cc3 CM |
2133 | trans = btrfs_start_transaction(root, 1); |
2134 | BUG_ON(!trans); | |
2135 | ||
7bb86316 CM |
2136 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2137 | 0, &objectid); | |
2138 | if (ret) | |
2139 | goto fail; | |
2140 | ||
2141 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2142 | objectid, trans->transid, 0, 0, | |
2143 | 0, 0); | |
5f39d397 CM |
2144 | if (IS_ERR(leaf)) |
2145 | return PTR_ERR(leaf); | |
2146 | ||
2147 | btrfs_set_header_nritems(leaf, 0); | |
2148 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2149 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2150 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2151 | btrfs_set_header_owner(leaf, objectid); |
2152 | ||
5f39d397 CM |
2153 | write_extent_buffer(leaf, root->fs_info->fsid, |
2154 | (unsigned long)btrfs_header_fsid(leaf), | |
2155 | BTRFS_FSID_SIZE); | |
2156 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2157 | |
2158 | inode_item = &root_item.inode; | |
2159 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2160 | inode_item->generation = cpu_to_le64(1); |
2161 | inode_item->size = cpu_to_le64(3); | |
2162 | inode_item->nlink = cpu_to_le32(1); | |
2163 | inode_item->nblocks = cpu_to_le64(1); | |
2164 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2165 | |
db94535d CM |
2166 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2167 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2168 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2169 | btrfs_set_root_used(&root_item, 0); |
2170 | ||
5eda7b5e CM |
2171 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2172 | root_item.drop_level = 0; | |
5f39d397 CM |
2173 | |
2174 | free_extent_buffer(leaf); | |
2175 | leaf = NULL; | |
39279cc3 | 2176 | |
39279cc3 CM |
2177 | btrfs_set_root_dirid(&root_item, new_dirid); |
2178 | ||
2179 | key.objectid = objectid; | |
2180 | key.offset = 1; | |
39279cc3 CM |
2181 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2182 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2183 | &root_item); | |
54aa1f4d CM |
2184 | if (ret) |
2185 | goto fail; | |
39279cc3 CM |
2186 | |
2187 | /* | |
2188 | * insert the directory item | |
2189 | */ | |
2190 | key.offset = (u64)-1; | |
2191 | dir = root->fs_info->sb->s_root->d_inode; | |
2192 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2193 | name, namelen, dir->i_ino, &key, | |
2194 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2195 | if (ret) |
2196 | goto fail; | |
39279cc3 | 2197 | |
3954401f CM |
2198 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2199 | name, namelen, objectid, | |
2200 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2201 | if (ret) | |
2202 | goto fail; | |
2203 | ||
39279cc3 | 2204 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2205 | if (ret) |
2206 | goto fail_commit; | |
39279cc3 | 2207 | |
58176a96 | 2208 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2209 | BUG_ON(!new_root); |
2210 | ||
2211 | trans = btrfs_start_transaction(new_root, 1); | |
2212 | BUG_ON(!trans); | |
2213 | ||
2214 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
2215 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
2216 | if (IS_ERR(inode)) |
2217 | goto fail; | |
39279cc3 CM |
2218 | inode->i_op = &btrfs_dir_inode_operations; |
2219 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2220 | new_root->inode = inode; |
39279cc3 | 2221 | |
3954401f CM |
2222 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2223 | new_dirid); | |
39279cc3 | 2224 | inode->i_nlink = 1; |
3954401f | 2225 | inode->i_size = 0; |
39279cc3 | 2226 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2227 | if (ret) |
2228 | goto fail; | |
2229 | fail: | |
d3c2fdcf | 2230 | nr = trans->blocks_used; |
54aa1f4d CM |
2231 | err = btrfs_commit_transaction(trans, root); |
2232 | if (err && !ret) | |
2233 | ret = err; | |
2234 | fail_commit: | |
39279cc3 | 2235 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2236 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2237 | return ret; |
39279cc3 CM |
2238 | } |
2239 | ||
2240 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2241 | { | |
2242 | struct btrfs_trans_handle *trans; | |
2243 | struct btrfs_key key; | |
2244 | struct btrfs_root_item new_root_item; | |
5f39d397 | 2245 | struct extent_buffer *tmp; |
39279cc3 | 2246 | int ret; |
54aa1f4d | 2247 | int err; |
39279cc3 | 2248 | u64 objectid; |
1832a6d5 | 2249 | unsigned long nr = 0; |
39279cc3 CM |
2250 | |
2251 | if (!root->ref_cows) | |
2252 | return -EINVAL; | |
2253 | ||
011410bd CM |
2254 | down_write(&root->snap_sem); |
2255 | freeze_bdev(root->fs_info->sb->s_bdev); | |
2256 | thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb); | |
2257 | ||
39279cc3 | 2258 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2259 | ret = btrfs_check_free_space(root, 1, 0); |
2260 | if (ret) | |
2261 | goto fail_unlock; | |
2262 | ||
39279cc3 CM |
2263 | trans = btrfs_start_transaction(root, 1); |
2264 | BUG_ON(!trans); | |
2265 | ||
2266 | ret = btrfs_update_inode(trans, root, root->inode); | |
54aa1f4d CM |
2267 | if (ret) |
2268 | goto fail; | |
39279cc3 CM |
2269 | |
2270 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, | |
2271 | 0, &objectid); | |
54aa1f4d CM |
2272 | if (ret) |
2273 | goto fail; | |
39279cc3 CM |
2274 | |
2275 | memcpy(&new_root_item, &root->root_item, | |
2276 | sizeof(new_root_item)); | |
2277 | ||
2278 | key.objectid = objectid; | |
2279 | key.offset = 1; | |
39279cc3 | 2280 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
be20aa9d | 2281 | |
9691975d | 2282 | extent_buffer_get(root->node); |
83df7c1d | 2283 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); |
9691975d | 2284 | free_extent_buffer(tmp); |
be20aa9d CM |
2285 | |
2286 | btrfs_copy_root(trans, root, root->node, &tmp, objectid); | |
2287 | ||
2288 | btrfs_set_root_bytenr(&new_root_item, tmp->start); | |
2289 | btrfs_set_root_level(&new_root_item, btrfs_header_level(tmp)); | |
39279cc3 CM |
2290 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
2291 | &new_root_item); | |
be20aa9d | 2292 | free_extent_buffer(tmp); |
54aa1f4d CM |
2293 | if (ret) |
2294 | goto fail; | |
39279cc3 CM |
2295 | |
2296 | /* | |
2297 | * insert the directory item | |
2298 | */ | |
2299 | key.offset = (u64)-1; | |
2300 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2301 | name, namelen, | |
2302 | root->fs_info->sb->s_root->d_inode->i_ino, | |
2303 | &key, BTRFS_FT_DIR); | |
2304 | ||
54aa1f4d CM |
2305 | if (ret) |
2306 | goto fail; | |
39279cc3 | 2307 | |
3954401f CM |
2308 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2309 | name, namelen, objectid, | |
2310 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2311 | ||
2312 | if (ret) | |
2313 | goto fail; | |
54aa1f4d | 2314 | fail: |
d3c2fdcf | 2315 | nr = trans->blocks_used; |
54aa1f4d | 2316 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2317 | |
54aa1f4d CM |
2318 | if (err && !ret) |
2319 | ret = err; | |
1832a6d5 | 2320 | fail_unlock: |
39279cc3 | 2321 | mutex_unlock(&root->fs_info->fs_mutex); |
011410bd | 2322 | up_write(&root->snap_sem); |
d3c2fdcf | 2323 | btrfs_btree_balance_dirty(root, nr); |
54aa1f4d | 2324 | return ret; |
39279cc3 CM |
2325 | } |
2326 | ||
edbd8d4e | 2327 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
2328 | struct file_ra_state *ra, struct file *file, |
2329 | pgoff_t offset, pgoff_t last_index) | |
2330 | { | |
2331 | pgoff_t req_size; | |
2332 | ||
2333 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2334 | req_size = last_index - offset + 1; | |
2335 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2336 | return offset; | |
2337 | #else | |
2338 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2339 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2340 | return offset + req_size; | |
2341 | #endif | |
2342 | } | |
2343 | ||
2344 | int btrfs_defrag_file(struct file *file) { | |
6da6abae | 2345 | struct inode *inode = fdentry(file)->d_inode; |
1832a6d5 | 2346 | struct btrfs_root *root = BTRFS_I(inode)->root; |
86479a04 CM |
2347 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
2348 | struct page *page; | |
2349 | unsigned long last_index; | |
2350 | unsigned long ra_index = 0; | |
2351 | u64 page_start; | |
2352 | u64 page_end; | |
edbd8d4e CM |
2353 | u64 delalloc_start; |
2354 | u64 existing_delalloc; | |
86479a04 | 2355 | unsigned long i; |
1832a6d5 CM |
2356 | int ret; |
2357 | ||
2358 | mutex_lock(&root->fs_info->fs_mutex); | |
2359 | ret = btrfs_check_free_space(root, inode->i_size, 0); | |
2360 | mutex_unlock(&root->fs_info->fs_mutex); | |
2361 | if (ret) | |
2362 | return -ENOSPC; | |
86479a04 CM |
2363 | |
2364 | mutex_lock(&inode->i_mutex); | |
2365 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2366 | for (i = 0; i <= last_index; i++) { | |
2367 | if (i == ra_index) { | |
edbd8d4e CM |
2368 | ra_index = btrfs_force_ra(inode->i_mapping, |
2369 | &file->f_ra, | |
2370 | file, ra_index, last_index); | |
86479a04 CM |
2371 | } |
2372 | page = grab_cache_page(inode->i_mapping, i); | |
2373 | if (!page) | |
2374 | goto out_unlock; | |
2375 | if (!PageUptodate(page)) { | |
2376 | btrfs_readpage(NULL, page); | |
2377 | lock_page(page); | |
2378 | if (!PageUptodate(page)) { | |
2379 | unlock_page(page); | |
2380 | page_cache_release(page); | |
2381 | goto out_unlock; | |
2382 | } | |
2383 | } | |
35ebb934 | 2384 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2385 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2386 | ||
2387 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
edbd8d4e CM |
2388 | delalloc_start = page_start; |
2389 | existing_delalloc = | |
2390 | count_range_bits(&BTRFS_I(inode)->extent_tree, | |
2391 | &delalloc_start, page_end, | |
2392 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | |
86479a04 CM |
2393 | set_extent_delalloc(em_tree, page_start, |
2394 | page_end, GFP_NOFS); | |
edbd8d4e CM |
2395 | |
2396 | spin_lock(&root->fs_info->delalloc_lock); | |
2397 | root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - | |
2398 | existing_delalloc; | |
2399 | spin_unlock(&root->fs_info->delalloc_lock); | |
2400 | ||
86479a04 CM |
2401 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); |
2402 | set_page_dirty(page); | |
2403 | unlock_page(page); | |
2404 | page_cache_release(page); | |
2405 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2406 | } | |
2407 | ||
2408 | out_unlock: | |
2409 | mutex_unlock(&inode->i_mutex); | |
2410 | return 0; | |
2411 | } | |
2412 | ||
edbd8d4e CM |
2413 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) |
2414 | { | |
2415 | u64 new_size; | |
2416 | u64 old_size; | |
2417 | struct btrfs_ioctl_vol_args *vol_args; | |
2418 | struct btrfs_trans_handle *trans; | |
2419 | char *sizestr; | |
2420 | int ret = 0; | |
2421 | int namelen; | |
2422 | int mod = 0; | |
2423 | ||
2424 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
2425 | ||
2426 | if (!vol_args) | |
2427 | return -ENOMEM; | |
2428 | ||
2429 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2430 | ret = -EFAULT; | |
2431 | goto out; | |
2432 | } | |
2433 | namelen = strlen(vol_args->name); | |
2434 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2435 | ret = -EINVAL; | |
2436 | goto out; | |
2437 | } | |
2438 | ||
2439 | sizestr = vol_args->name; | |
2440 | if (!strcmp(sizestr, "max")) | |
2441 | new_size = root->fs_info->sb->s_bdev->bd_inode->i_size; | |
2442 | else { | |
2443 | if (sizestr[0] == '-') { | |
2444 | mod = -1; | |
2445 | sizestr++; | |
2446 | } else if (sizestr[0] == '+') { | |
2447 | mod = 1; | |
2448 | sizestr++; | |
2449 | } | |
2450 | new_size = btrfs_parse_size(sizestr); | |
2451 | if (new_size == 0) { | |
2452 | ret = -EINVAL; | |
2453 | goto out; | |
2454 | } | |
2455 | } | |
2456 | ||
2457 | mutex_lock(&root->fs_info->fs_mutex); | |
2458 | old_size = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
2459 | ||
2460 | if (mod < 0) { | |
2461 | if (new_size > old_size) { | |
2462 | ret = -EINVAL; | |
2463 | goto out_unlock; | |
2464 | } | |
2465 | new_size = old_size - new_size; | |
2466 | } else if (mod > 0) { | |
2467 | new_size = old_size + new_size; | |
2468 | } | |
2469 | ||
2470 | if (new_size < 256 * 1024 * 1024) { | |
2471 | ret = -EINVAL; | |
2472 | goto out_unlock; | |
2473 | } | |
2474 | if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) { | |
2475 | ret = -EFBIG; | |
2476 | goto out_unlock; | |
2477 | } | |
2478 | new_size = (new_size / root->sectorsize) * root->sectorsize; | |
2479 | ||
2480 | printk("new size is %Lu\n", new_size); | |
2481 | if (new_size > old_size) { | |
2482 | trans = btrfs_start_transaction(root, 1); | |
2483 | ret = btrfs_grow_extent_tree(trans, root, new_size); | |
2484 | btrfs_commit_transaction(trans, root); | |
2485 | } else { | |
2486 | ret = btrfs_shrink_extent_tree(root, new_size); | |
2487 | } | |
2488 | ||
2489 | out_unlock: | |
2490 | mutex_unlock(&root->fs_info->fs_mutex); | |
2491 | out: | |
2492 | kfree(vol_args); | |
2493 | return ret; | |
2494 | } | |
2495 | ||
4313b399 CM |
2496 | static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root, |
2497 | void __user *arg) | |
39279cc3 | 2498 | { |
4aec2b52 | 2499 | struct btrfs_ioctl_vol_args *vol_args; |
39279cc3 | 2500 | struct btrfs_dir_item *di; |
39279cc3 CM |
2501 | struct btrfs_path *path; |
2502 | u64 root_dirid; | |
4aec2b52 CM |
2503 | int namelen; |
2504 | int ret; | |
39279cc3 | 2505 | |
4aec2b52 | 2506 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
5f39d397 | 2507 | |
4aec2b52 CM |
2508 | if (!vol_args) |
2509 | return -ENOMEM; | |
2510 | ||
2511 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2512 | ret = -EFAULT; | |
2513 | goto out; | |
2514 | } | |
2515 | ||
2516 | namelen = strlen(vol_args->name); | |
2517 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2518 | ret = -EINVAL; | |
2519 | goto out; | |
2520 | } | |
2521 | if (strchr(vol_args->name, '/')) { | |
2522 | ret = -EINVAL; | |
2523 | goto out; | |
2524 | } | |
d03581f4 CH |
2525 | |
2526 | path = btrfs_alloc_path(); | |
4aec2b52 CM |
2527 | if (!path) { |
2528 | ret = -ENOMEM; | |
2529 | goto out; | |
2530 | } | |
d03581f4 CH |
2531 | |
2532 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2533 | mutex_lock(&root->fs_info->fs_mutex); | |
2534 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2535 | path, root_dirid, | |
4aec2b52 | 2536 | vol_args->name, namelen, 0); |
d03581f4 CH |
2537 | mutex_unlock(&root->fs_info->fs_mutex); |
2538 | btrfs_free_path(path); | |
4aec2b52 CM |
2539 | |
2540 | if (di && !IS_ERR(di)) { | |
2541 | ret = -EEXIST; | |
2542 | goto out; | |
2543 | } | |
2544 | ||
2545 | if (IS_ERR(di)) { | |
2546 | ret = PTR_ERR(di); | |
2547 | goto out; | |
2548 | } | |
d03581f4 CH |
2549 | |
2550 | if (root == root->fs_info->tree_root) | |
4aec2b52 CM |
2551 | ret = create_subvol(root, vol_args->name, namelen); |
2552 | else | |
2553 | ret = create_snapshot(root, vol_args->name, namelen); | |
2554 | out: | |
2555 | kfree(vol_args); | |
2556 | return ret; | |
d03581f4 CH |
2557 | } |
2558 | ||
2559 | static int btrfs_ioctl_defrag(struct file *file) | |
2560 | { | |
6da6abae | 2561 | struct inode *inode = fdentry(file)->d_inode; |
d03581f4 CH |
2562 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2563 | ||
2564 | switch (inode->i_mode & S_IFMT) { | |
2565 | case S_IFDIR: | |
39279cc3 | 2566 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2567 | btrfs_defrag_root(root, 0); |
2568 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2569 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2570 | break; |
d03581f4 CH |
2571 | case S_IFREG: |
2572 | btrfs_defrag_file(file); | |
2573 | break; | |
2574 | } | |
2575 | ||
2576 | return 0; | |
2577 | } | |
6702ed49 | 2578 | |
d03581f4 CH |
2579 | long btrfs_ioctl(struct file *file, unsigned int |
2580 | cmd, unsigned long arg) | |
2581 | { | |
6da6abae | 2582 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
d03581f4 CH |
2583 | |
2584 | switch (cmd) { | |
2585 | case BTRFS_IOC_SNAP_CREATE: | |
2586 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2587 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2588 | return btrfs_ioctl_defrag(file); |
edbd8d4e CM |
2589 | case BTRFS_IOC_RESIZE: |
2590 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
39279cc3 | 2591 | } |
d03581f4 CH |
2592 | |
2593 | return -ENOTTY; | |
39279cc3 CM |
2594 | } |
2595 | ||
39279cc3 CM |
2596 | /* |
2597 | * Called inside transaction, so use GFP_NOFS | |
2598 | */ | |
2599 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2600 | { | |
2601 | struct btrfs_inode *ei; | |
2602 | ||
2603 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2604 | if (!ei) | |
2605 | return NULL; | |
15ee9bc7 | 2606 | ei->last_trans = 0; |
39279cc3 CM |
2607 | return &ei->vfs_inode; |
2608 | } | |
2609 | ||
2610 | void btrfs_destroy_inode(struct inode *inode) | |
2611 | { | |
2612 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2613 | WARN_ON(inode->i_data.nrpages); | |
2614 | ||
2615 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2616 | } | |
2617 | ||
44ec0b71 CM |
2618 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2619 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2620 | #else | |
39279cc3 CM |
2621 | static void init_once(void * foo, struct kmem_cache * cachep, |
2622 | unsigned long flags) | |
44ec0b71 | 2623 | #endif |
39279cc3 CM |
2624 | { |
2625 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2626 | ||
2627 | inode_init_once(&ei->vfs_inode); | |
2628 | } | |
2629 | ||
2630 | void btrfs_destroy_cachep(void) | |
2631 | { | |
2632 | if (btrfs_inode_cachep) | |
2633 | kmem_cache_destroy(btrfs_inode_cachep); | |
2634 | if (btrfs_trans_handle_cachep) | |
2635 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2636 | if (btrfs_transaction_cachep) | |
2637 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2638 | if (btrfs_bit_radix_cachep) | |
2639 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2640 | if (btrfs_path_cachep) | |
2641 | kmem_cache_destroy(btrfs_path_cachep); | |
2642 | } | |
2643 | ||
86479a04 | 2644 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2645 | unsigned long extra_flags, |
44ec0b71 CM |
2646 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2647 | void (*ctor)(struct kmem_cache *, void *) | |
2648 | #else | |
92fee66d | 2649 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2650 | unsigned long) |
2651 | #endif | |
2652 | ) | |
92fee66d CM |
2653 | { |
2654 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2655 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2656 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2657 | ,NULL | |
2658 | #endif | |
2659 | ); | |
2660 | } | |
2661 | ||
39279cc3 CM |
2662 | int btrfs_init_cachep(void) |
2663 | { | |
86479a04 | 2664 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2665 | sizeof(struct btrfs_inode), |
2666 | 0, init_once); | |
39279cc3 CM |
2667 | if (!btrfs_inode_cachep) |
2668 | goto fail; | |
86479a04 CM |
2669 | btrfs_trans_handle_cachep = |
2670 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2671 | sizeof(struct btrfs_trans_handle), | |
2672 | 0, NULL); | |
39279cc3 CM |
2673 | if (!btrfs_trans_handle_cachep) |
2674 | goto fail; | |
86479a04 | 2675 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2676 | sizeof(struct btrfs_transaction), |
92fee66d | 2677 | 0, NULL); |
39279cc3 CM |
2678 | if (!btrfs_transaction_cachep) |
2679 | goto fail; | |
86479a04 | 2680 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2681 | sizeof(struct btrfs_path), |
92fee66d | 2682 | 0, NULL); |
39279cc3 CM |
2683 | if (!btrfs_path_cachep) |
2684 | goto fail; | |
86479a04 | 2685 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2686 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2687 | if (!btrfs_bit_radix_cachep) |
2688 | goto fail; | |
2689 | return 0; | |
2690 | fail: | |
2691 | btrfs_destroy_cachep(); | |
2692 | return -ENOMEM; | |
2693 | } | |
2694 | ||
2695 | static int btrfs_getattr(struct vfsmount *mnt, | |
2696 | struct dentry *dentry, struct kstat *stat) | |
2697 | { | |
2698 | struct inode *inode = dentry->d_inode; | |
2699 | generic_fillattr(inode, stat); | |
2700 | stat->blksize = 256 * 1024; | |
2701 | return 0; | |
2702 | } | |
2703 | ||
2704 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2705 | struct inode * new_dir,struct dentry *new_dentry) | |
2706 | { | |
2707 | struct btrfs_trans_handle *trans; | |
2708 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2709 | struct inode *new_inode = new_dentry->d_inode; | |
2710 | struct inode *old_inode = old_dentry->d_inode; | |
2711 | struct timespec ctime = CURRENT_TIME; | |
2712 | struct btrfs_path *path; | |
39279cc3 CM |
2713 | int ret; |
2714 | ||
2715 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2716 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2717 | return -ENOTEMPTY; | |
2718 | } | |
5f39d397 | 2719 | |
39279cc3 | 2720 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2721 | ret = btrfs_check_free_space(root, 1, 0); |
2722 | if (ret) | |
2723 | goto out_unlock; | |
2724 | ||
39279cc3 | 2725 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2726 | |
39279cc3 CM |
2727 | btrfs_set_trans_block_group(trans, new_dir); |
2728 | path = btrfs_alloc_path(); | |
2729 | if (!path) { | |
2730 | ret = -ENOMEM; | |
2731 | goto out_fail; | |
2732 | } | |
2733 | ||
2734 | old_dentry->d_inode->i_nlink++; | |
2735 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2736 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2737 | old_inode->i_ctime = ctime; | |
5f39d397 | 2738 | |
39279cc3 CM |
2739 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2740 | if (ret) | |
2741 | goto out_fail; | |
2742 | ||
2743 | if (new_inode) { | |
2744 | new_inode->i_ctime = CURRENT_TIME; | |
2745 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2746 | if (ret) | |
2747 | goto out_fail; | |
39279cc3 CM |
2748 | } |
2749 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2750 | if (ret) | |
2751 | goto out_fail; | |
2752 | ||
2753 | out_fail: | |
2754 | btrfs_free_path(path); | |
2755 | btrfs_end_transaction(trans, root); | |
1832a6d5 | 2756 | out_unlock: |
39279cc3 CM |
2757 | mutex_unlock(&root->fs_info->fs_mutex); |
2758 | return ret; | |
2759 | } | |
2760 | ||
2761 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2762 | const char *symname) | |
2763 | { | |
2764 | struct btrfs_trans_handle *trans; | |
2765 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2766 | struct btrfs_path *path; | |
2767 | struct btrfs_key key; | |
1832a6d5 | 2768 | struct inode *inode = NULL; |
39279cc3 CM |
2769 | int err; |
2770 | int drop_inode = 0; | |
2771 | u64 objectid; | |
2772 | int name_len; | |
2773 | int datasize; | |
5f39d397 | 2774 | unsigned long ptr; |
39279cc3 | 2775 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2776 | struct extent_buffer *leaf; |
1832a6d5 | 2777 | unsigned long nr = 0; |
39279cc3 CM |
2778 | |
2779 | name_len = strlen(symname) + 1; | |
2780 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2781 | return -ENAMETOOLONG; | |
1832a6d5 | 2782 | |
39279cc3 | 2783 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2784 | err = btrfs_check_free_space(root, 1, 0); |
2785 | if (err) | |
2786 | goto out_fail; | |
2787 | ||
39279cc3 CM |
2788 | trans = btrfs_start_transaction(root, 1); |
2789 | btrfs_set_trans_block_group(trans, dir); | |
2790 | ||
2791 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2792 | if (err) { | |
2793 | err = -ENOSPC; | |
2794 | goto out_unlock; | |
2795 | } | |
2796 | ||
2797 | inode = btrfs_new_inode(trans, root, objectid, | |
2798 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2799 | err = PTR_ERR(inode); | |
2800 | if (IS_ERR(inode)) | |
2801 | goto out_unlock; | |
2802 | ||
2803 | btrfs_set_trans_block_group(trans, inode); | |
2804 | err = btrfs_add_nondir(trans, dentry, inode); | |
2805 | if (err) | |
2806 | drop_inode = 1; | |
2807 | else { | |
2808 | inode->i_mapping->a_ops = &btrfs_aops; | |
2809 | inode->i_fop = &btrfs_file_operations; | |
2810 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2811 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2812 | inode->i_mapping, GFP_NOFS); | |
07157aac | 2813 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
2814 | } |
2815 | dir->i_sb->s_dirt = 1; | |
2816 | btrfs_update_inode_block_group(trans, inode); | |
2817 | btrfs_update_inode_block_group(trans, dir); | |
2818 | if (drop_inode) | |
2819 | goto out_unlock; | |
2820 | ||
2821 | path = btrfs_alloc_path(); | |
2822 | BUG_ON(!path); | |
2823 | key.objectid = inode->i_ino; | |
2824 | key.offset = 0; | |
39279cc3 CM |
2825 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2826 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2827 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2828 | datasize); | |
54aa1f4d CM |
2829 | if (err) { |
2830 | drop_inode = 1; | |
2831 | goto out_unlock; | |
2832 | } | |
5f39d397 CM |
2833 | leaf = path->nodes[0]; |
2834 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2835 | struct btrfs_file_extent_item); | |
2836 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2837 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2838 | BTRFS_FILE_EXTENT_INLINE); |
2839 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2840 | write_extent_buffer(leaf, symname, ptr, name_len); |
2841 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2842 | btrfs_free_path(path); |
5f39d397 | 2843 | |
39279cc3 CM |
2844 | inode->i_op = &btrfs_symlink_inode_operations; |
2845 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2846 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2847 | err = btrfs_update_inode(trans, root, inode); |
2848 | if (err) | |
2849 | drop_inode = 1; | |
39279cc3 CM |
2850 | |
2851 | out_unlock: | |
d3c2fdcf | 2852 | nr = trans->blocks_used; |
39279cc3 | 2853 | btrfs_end_transaction(trans, root); |
1832a6d5 | 2854 | out_fail: |
39279cc3 | 2855 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 CM |
2856 | if (drop_inode) { |
2857 | inode_dec_link_count(inode); | |
2858 | iput(inode); | |
2859 | } | |
d3c2fdcf | 2860 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2861 | return err; |
2862 | } | |
2863 | ||
2864 | static struct inode_operations btrfs_dir_inode_operations = { | |
2865 | .lookup = btrfs_lookup, | |
2866 | .create = btrfs_create, | |
2867 | .unlink = btrfs_unlink, | |
2868 | .link = btrfs_link, | |
2869 | .mkdir = btrfs_mkdir, | |
2870 | .rmdir = btrfs_rmdir, | |
2871 | .rename = btrfs_rename, | |
2872 | .symlink = btrfs_symlink, | |
2873 | .setattr = btrfs_setattr, | |
618e21d5 | 2874 | .mknod = btrfs_mknod, |
5103e947 JB |
2875 | .setxattr = generic_setxattr, |
2876 | .getxattr = generic_getxattr, | |
2877 | .listxattr = btrfs_listxattr, | |
2878 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2879 | }; |
2880 | ||
2881 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2882 | .lookup = btrfs_lookup, | |
2883 | }; | |
2884 | ||
2885 | static struct file_operations btrfs_dir_file_operations = { | |
2886 | .llseek = generic_file_llseek, | |
2887 | .read = generic_read_dir, | |
2888 | .readdir = btrfs_readdir, | |
34287aa3 | 2889 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2890 | #ifdef CONFIG_COMPAT |
34287aa3 | 2891 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2892 | #endif |
2893 | }; | |
2894 | ||
07157aac CM |
2895 | static struct extent_map_ops btrfs_extent_map_ops = { |
2896 | .fill_delalloc = run_delalloc_range, | |
2897 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2898 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2899 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2900 | }; | |
2901 | ||
39279cc3 CM |
2902 | static struct address_space_operations btrfs_aops = { |
2903 | .readpage = btrfs_readpage, | |
2904 | .writepage = btrfs_writepage, | |
b293f02e | 2905 | .writepages = btrfs_writepages, |
3ab2fb5a | 2906 | .readpages = btrfs_readpages, |
39279cc3 | 2907 | .sync_page = block_sync_page, |
39279cc3 | 2908 | .bmap = btrfs_bmap, |
a52d9a80 CM |
2909 | .invalidatepage = btrfs_invalidatepage, |
2910 | .releasepage = btrfs_releasepage, | |
2911 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2912 | }; |
2913 | ||
2914 | static struct address_space_operations btrfs_symlink_aops = { | |
2915 | .readpage = btrfs_readpage, | |
2916 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2917 | .invalidatepage = btrfs_invalidatepage, |
2918 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2919 | }; |
2920 | ||
2921 | static struct inode_operations btrfs_file_inode_operations = { | |
2922 | .truncate = btrfs_truncate, | |
2923 | .getattr = btrfs_getattr, | |
2924 | .setattr = btrfs_setattr, | |
5103e947 JB |
2925 | .setxattr = generic_setxattr, |
2926 | .getxattr = generic_getxattr, | |
2927 | .listxattr = btrfs_listxattr, | |
2928 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2929 | }; |
2930 | ||
618e21d5 JB |
2931 | static struct inode_operations btrfs_special_inode_operations = { |
2932 | .getattr = btrfs_getattr, | |
2933 | .setattr = btrfs_setattr, | |
2934 | }; | |
2935 | ||
39279cc3 CM |
2936 | static struct inode_operations btrfs_symlink_inode_operations = { |
2937 | .readlink = generic_readlink, | |
2938 | .follow_link = page_follow_link_light, | |
2939 | .put_link = page_put_link, | |
2940 | }; |