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) | |
f9ef6604 | 84 | thresh = total * 90; |
1832a6d5 | 85 | else |
f9ef6604 CM |
86 | thresh = total * 85; |
87 | ||
88 | do_div(thresh, 100); | |
1832a6d5 CM |
89 | |
90 | spin_lock(&root->fs_info->delalloc_lock); | |
91 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) | |
92 | ret = -ENOSPC; | |
93 | spin_unlock(&root->fs_info->delalloc_lock); | |
94 | return ret; | |
95 | } | |
96 | ||
be20aa9d | 97 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
98 | { |
99 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
100 | struct btrfs_trans_handle *trans; | |
b888db2b | 101 | u64 alloc_hint = 0; |
db94535d | 102 | u64 num_bytes; |
c59f8951 | 103 | u64 cur_alloc_size; |
db94535d | 104 | u64 blocksize = root->sectorsize; |
be20aa9d CM |
105 | struct btrfs_key ins; |
106 | int ret; | |
b888db2b | 107 | |
b888db2b | 108 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 109 | BUG_ON(!trans); |
be20aa9d CM |
110 | btrfs_set_trans_block_group(trans, inode); |
111 | ||
db94535d | 112 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 113 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 114 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 115 | start, start + num_bytes, start, &alloc_hint); |
db94535d | 116 | |
179e29e4 CM |
117 | if (alloc_hint == EXTENT_MAP_INLINE) |
118 | goto out; | |
119 | ||
c59f8951 CM |
120 | while(num_bytes > 0) { |
121 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
122 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
123 | root->root_key.objectid, | |
124 | trans->transid, | |
125 | inode->i_ino, start, 0, | |
126 | alloc_hint, (u64)-1, &ins, 1); | |
127 | if (ret) { | |
128 | WARN_ON(1); | |
129 | goto out; | |
130 | } | |
131 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
132 | start, ins.objectid, ins.offset, | |
133 | ins.offset); | |
134 | num_bytes -= cur_alloc_size; | |
135 | alloc_hint = ins.objectid + ins.offset; | |
136 | start += cur_alloc_size; | |
b888db2b | 137 | } |
dc17ff8f | 138 | btrfs_add_ordered_inode(inode); |
b888db2b CM |
139 | out: |
140 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
141 | return ret; |
142 | } | |
143 | ||
144 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
145 | { | |
146 | u64 extent_start; | |
147 | u64 extent_end; | |
148 | u64 bytenr; | |
149 | u64 cow_end; | |
1832a6d5 | 150 | u64 loops = 0; |
c31f8830 | 151 | u64 total_fs_bytes; |
be20aa9d CM |
152 | struct btrfs_root *root = BTRFS_I(inode)->root; |
153 | struct extent_buffer *leaf; | |
154 | int found_type; | |
155 | struct btrfs_path *path; | |
156 | struct btrfs_file_extent_item *item; | |
157 | int ret; | |
158 | int err; | |
159 | struct btrfs_key found_key; | |
160 | ||
c31f8830 | 161 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
162 | path = btrfs_alloc_path(); |
163 | BUG_ON(!path); | |
164 | again: | |
165 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
166 | inode->i_ino, start, 0); | |
167 | if (ret < 0) { | |
168 | btrfs_free_path(path); | |
169 | return ret; | |
170 | } | |
171 | ||
172 | cow_end = end; | |
173 | if (ret != 0) { | |
174 | if (path->slots[0] == 0) | |
175 | goto not_found; | |
176 | path->slots[0]--; | |
177 | } | |
178 | ||
179 | leaf = path->nodes[0]; | |
180 | item = btrfs_item_ptr(leaf, path->slots[0], | |
181 | struct btrfs_file_extent_item); | |
182 | ||
183 | /* are we inside the extent that was found? */ | |
184 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
185 | found_type = btrfs_key_type(&found_key); | |
186 | if (found_key.objectid != inode->i_ino || | |
187 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
188 | goto not_found; | |
189 | } | |
190 | ||
191 | found_type = btrfs_file_extent_type(leaf, item); | |
192 | extent_start = found_key.offset; | |
193 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
194 | u64 extent_num_bytes; |
195 | ||
196 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
197 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
198 | err = 0; |
199 | ||
1832a6d5 CM |
200 | if (loops && start != extent_start) |
201 | goto not_found; | |
202 | ||
be20aa9d CM |
203 | if (start < extent_start || start >= extent_end) |
204 | goto not_found; | |
205 | ||
206 | cow_end = min(end, extent_end - 1); | |
207 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
208 | if (bytenr == 0) | |
209 | goto not_found; | |
210 | ||
c31f8830 CM |
211 | /* |
212 | * we may be called by the resizer, make sure we're inside | |
213 | * the limits of the FS | |
214 | */ | |
215 | if (bytenr + extent_num_bytes > total_fs_bytes) | |
216 | goto not_found; | |
217 | ||
be20aa9d CM |
218 | if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) { |
219 | goto not_found; | |
220 | } | |
221 | ||
222 | start = extent_end; | |
bd09835d | 223 | } else { |
be20aa9d CM |
224 | goto not_found; |
225 | } | |
226 | loop: | |
227 | if (start > end) { | |
228 | btrfs_free_path(path); | |
229 | return 0; | |
230 | } | |
231 | btrfs_release_path(root, path); | |
1832a6d5 | 232 | loops++; |
be20aa9d CM |
233 | goto again; |
234 | ||
235 | not_found: | |
236 | cow_file_range(inode, start, cow_end); | |
237 | start = cow_end + 1; | |
238 | goto loop; | |
239 | } | |
240 | ||
241 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
242 | { | |
243 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1832a6d5 | 244 | u64 num_bytes; |
be20aa9d CM |
245 | int ret; |
246 | ||
247 | mutex_lock(&root->fs_info->fs_mutex); | |
248 | if (btrfs_test_opt(root, NODATACOW)) | |
249 | ret = run_delalloc_nocow(inode, start, end); | |
250 | else | |
251 | ret = cow_file_range(inode, start, end); | |
1832a6d5 CM |
252 | |
253 | spin_lock(&root->fs_info->delalloc_lock); | |
254 | num_bytes = end + 1 - start; | |
255 | if (root->fs_info->delalloc_bytes < num_bytes) { | |
256 | printk("delalloc accounting error total %llu sub %llu\n", | |
257 | root->fs_info->delalloc_bytes, num_bytes); | |
258 | } else { | |
259 | root->fs_info->delalloc_bytes -= num_bytes; | |
260 | } | |
261 | spin_unlock(&root->fs_info->delalloc_lock); | |
262 | ||
b888db2b CM |
263 | mutex_unlock(&root->fs_info->fs_mutex); |
264 | return ret; | |
265 | } | |
266 | ||
07157aac CM |
267 | int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end) |
268 | { | |
269 | struct inode *inode = page->mapping->host; | |
270 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
271 | struct btrfs_trans_handle *trans; | |
272 | char *kaddr; | |
b6cda9bc | 273 | int ret = 0; |
35ebb934 | 274 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
07157aac CM |
275 | size_t offset = start - page_start; |
276 | ||
b6cda9bc CM |
277 | if (btrfs_test_opt(root, NODATASUM)) |
278 | return 0; | |
279 | ||
07157aac CM |
280 | mutex_lock(&root->fs_info->fs_mutex); |
281 | trans = btrfs_start_transaction(root, 1); | |
282 | btrfs_set_trans_block_group(trans, inode); | |
283 | kaddr = kmap(page); | |
f578d4bd | 284 | btrfs_csum_file_block(trans, root, inode, inode->i_ino, |
07157aac CM |
285 | start, kaddr + offset, end - start + 1); |
286 | kunmap(page); | |
287 | ret = btrfs_end_transaction(trans, root); | |
288 | BUG_ON(ret); | |
289 | mutex_unlock(&root->fs_info->fs_mutex); | |
290 | return ret; | |
291 | } | |
292 | ||
293 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |
294 | { | |
295 | int ret = 0; | |
296 | struct inode *inode = page->mapping->host; | |
297 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
298 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
299 | struct btrfs_csum_item *item; | |
300 | struct btrfs_path *path = NULL; | |
ff79f819 | 301 | u32 csum; |
07157aac | 302 | |
b6cda9bc CM |
303 | if (btrfs_test_opt(root, NODATASUM)) |
304 | return 0; | |
305 | ||
07157aac CM |
306 | mutex_lock(&root->fs_info->fs_mutex); |
307 | path = btrfs_alloc_path(); | |
308 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
309 | if (IS_ERR(item)) { | |
310 | ret = PTR_ERR(item); | |
311 | /* a csum that isn't present is a preallocated region. */ | |
312 | if (ret == -ENOENT || ret == -EFBIG) | |
313 | ret = 0; | |
ff79f819 | 314 | csum = 0; |
07157aac CM |
315 | goto out; |
316 | } | |
ff79f819 CM |
317 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
318 | BTRFS_CRC32_SIZE); | |
319 | set_state_private(em_tree, start, csum); | |
07157aac CM |
320 | out: |
321 | if (path) | |
322 | btrfs_free_path(path); | |
323 | mutex_unlock(&root->fs_info->fs_mutex); | |
324 | return ret; | |
325 | } | |
326 | ||
327 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end) | |
328 | { | |
35ebb934 | 329 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 330 | struct inode *inode = page->mapping->host; |
07157aac CM |
331 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
332 | char *kaddr; | |
333 | u64 private; | |
334 | int ret; | |
ff79f819 CM |
335 | struct btrfs_root *root = BTRFS_I(inode)->root; |
336 | u32 csum = ~(u32)0; | |
bbf0d006 | 337 | unsigned long flags; |
07157aac | 338 | |
b6cda9bc CM |
339 | if (btrfs_test_opt(root, NODATASUM)) |
340 | return 0; | |
341 | ||
07157aac | 342 | ret = get_state_private(em_tree, start, &private); |
bbf0d006 | 343 | local_irq_save(flags); |
07157aac CM |
344 | kaddr = kmap_atomic(page, KM_IRQ0); |
345 | if (ret) { | |
346 | goto zeroit; | |
347 | } | |
ff79f819 CM |
348 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
349 | btrfs_csum_final(csum, (char *)&csum); | |
350 | if (csum != private) { | |
07157aac CM |
351 | goto zeroit; |
352 | } | |
353 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 354 | local_irq_restore(flags); |
07157aac CM |
355 | return 0; |
356 | ||
357 | zeroit: | |
358 | printk("btrfs csum failed ino %lu off %llu\n", | |
359 | page->mapping->host->i_ino, (unsigned long long)start); | |
db94535d CM |
360 | memset(kaddr + offset, 1, end - start + 1); |
361 | flush_dcache_page(page); | |
07157aac | 362 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 363 | local_irq_restore(flags); |
07157aac CM |
364 | return 0; |
365 | } | |
b888db2b | 366 | |
39279cc3 CM |
367 | void btrfs_read_locked_inode(struct inode *inode) |
368 | { | |
369 | struct btrfs_path *path; | |
5f39d397 | 370 | struct extent_buffer *leaf; |
39279cc3 | 371 | struct btrfs_inode_item *inode_item; |
5f39d397 | 372 | struct btrfs_inode_timespec *tspec; |
39279cc3 CM |
373 | struct btrfs_root *root = BTRFS_I(inode)->root; |
374 | struct btrfs_key location; | |
375 | u64 alloc_group_block; | |
618e21d5 | 376 | u32 rdev; |
39279cc3 CM |
377 | int ret; |
378 | ||
379 | path = btrfs_alloc_path(); | |
380 | BUG_ON(!path); | |
39279cc3 | 381 | mutex_lock(&root->fs_info->fs_mutex); |
39279cc3 | 382 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 383 | |
39279cc3 | 384 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 385 | if (ret) |
39279cc3 | 386 | goto make_bad; |
39279cc3 | 387 | |
5f39d397 CM |
388 | leaf = path->nodes[0]; |
389 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
390 | struct btrfs_inode_item); | |
391 | ||
392 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
393 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
394 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
395 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
396 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
397 | ||
398 | tspec = btrfs_inode_atime(inode_item); | |
399 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
400 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
401 | ||
402 | tspec = btrfs_inode_mtime(inode_item); | |
403 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
404 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
405 | ||
406 | tspec = btrfs_inode_ctime(inode_item); | |
407 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
408 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
409 | ||
410 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
411 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 412 | inode->i_rdev = 0; |
5f39d397 CM |
413 | rdev = btrfs_inode_rdev(leaf, inode_item); |
414 | ||
415 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
416 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
417 | alloc_group_block); | |
418 | ||
e52ec0eb CM |
419 | if (!BTRFS_I(inode)->block_group) { |
420 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
421 | NULL, 0, 0, 0); | |
422 | } | |
39279cc3 CM |
423 | btrfs_free_path(path); |
424 | inode_item = NULL; | |
425 | ||
426 | mutex_unlock(&root->fs_info->fs_mutex); | |
427 | ||
428 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
429 | case S_IFREG: |
430 | inode->i_mapping->a_ops = &btrfs_aops; | |
07157aac | 431 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
432 | inode->i_fop = &btrfs_file_operations; |
433 | inode->i_op = &btrfs_file_inode_operations; | |
434 | break; | |
435 | case S_IFDIR: | |
436 | inode->i_fop = &btrfs_dir_file_operations; | |
437 | if (root == root->fs_info->tree_root) | |
438 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
439 | else | |
440 | inode->i_op = &btrfs_dir_inode_operations; | |
441 | break; | |
442 | case S_IFLNK: | |
443 | inode->i_op = &btrfs_symlink_inode_operations; | |
444 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
445 | break; | |
618e21d5 JB |
446 | default: |
447 | init_special_inode(inode, inode->i_mode, rdev); | |
448 | break; | |
39279cc3 CM |
449 | } |
450 | return; | |
451 | ||
452 | make_bad: | |
453 | btrfs_release_path(root, path); | |
454 | btrfs_free_path(path); | |
455 | mutex_unlock(&root->fs_info->fs_mutex); | |
456 | make_bad_inode(inode); | |
457 | } | |
458 | ||
5f39d397 CM |
459 | static void fill_inode_item(struct extent_buffer *leaf, |
460 | struct btrfs_inode_item *item, | |
39279cc3 CM |
461 | struct inode *inode) |
462 | { | |
5f39d397 CM |
463 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
464 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
465 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
466 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
467 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
468 | ||
469 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
470 | inode->i_atime.tv_sec); | |
471 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
472 | inode->i_atime.tv_nsec); | |
473 | ||
474 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
475 | inode->i_mtime.tv_sec); | |
476 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
477 | inode->i_mtime.tv_nsec); | |
478 | ||
479 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
480 | inode->i_ctime.tv_sec); | |
481 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
482 | inode->i_ctime.tv_nsec); | |
483 | ||
484 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
485 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
486 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
487 | btrfs_set_inode_block_group(leaf, item, | |
39279cc3 CM |
488 | BTRFS_I(inode)->block_group->key.objectid); |
489 | } | |
490 | ||
a52d9a80 | 491 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
492 | struct btrfs_root *root, |
493 | struct inode *inode) | |
494 | { | |
495 | struct btrfs_inode_item *inode_item; | |
496 | struct btrfs_path *path; | |
5f39d397 | 497 | struct extent_buffer *leaf; |
39279cc3 CM |
498 | int ret; |
499 | ||
500 | path = btrfs_alloc_path(); | |
501 | BUG_ON(!path); | |
39279cc3 CM |
502 | ret = btrfs_lookup_inode(trans, root, path, |
503 | &BTRFS_I(inode)->location, 1); | |
504 | if (ret) { | |
505 | if (ret > 0) | |
506 | ret = -ENOENT; | |
507 | goto failed; | |
508 | } | |
509 | ||
5f39d397 CM |
510 | leaf = path->nodes[0]; |
511 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
512 | struct btrfs_inode_item); |
513 | ||
5f39d397 CM |
514 | fill_inode_item(leaf, inode_item, inode); |
515 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 516 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
517 | ret = 0; |
518 | failed: | |
519 | btrfs_release_path(root, path); | |
520 | btrfs_free_path(path); | |
521 | return ret; | |
522 | } | |
523 | ||
524 | ||
525 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
526 | struct btrfs_root *root, | |
527 | struct inode *dir, | |
528 | struct dentry *dentry) | |
529 | { | |
530 | struct btrfs_path *path; | |
531 | const char *name = dentry->d_name.name; | |
532 | int name_len = dentry->d_name.len; | |
533 | int ret = 0; | |
5f39d397 | 534 | struct extent_buffer *leaf; |
39279cc3 | 535 | struct btrfs_dir_item *di; |
5f39d397 | 536 | struct btrfs_key key; |
39279cc3 CM |
537 | |
538 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
539 | if (!path) { |
540 | ret = -ENOMEM; | |
541 | goto err; | |
542 | } | |
543 | ||
39279cc3 CM |
544 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
545 | name, name_len, -1); | |
546 | if (IS_ERR(di)) { | |
547 | ret = PTR_ERR(di); | |
548 | goto err; | |
549 | } | |
550 | if (!di) { | |
551 | ret = -ENOENT; | |
552 | goto err; | |
553 | } | |
5f39d397 CM |
554 | leaf = path->nodes[0]; |
555 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 556 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
557 | if (ret) |
558 | goto err; | |
39279cc3 CM |
559 | btrfs_release_path(root, path); |
560 | ||
561 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 562 | key.objectid, name, name_len, -1); |
39279cc3 CM |
563 | if (IS_ERR(di)) { |
564 | ret = PTR_ERR(di); | |
565 | goto err; | |
566 | } | |
567 | if (!di) { | |
568 | ret = -ENOENT; | |
569 | goto err; | |
570 | } | |
571 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
572 | |
573 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
574 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
575 | dentry->d_inode->i_ino, | |
576 | dentry->d_parent->d_inode->i_ino); | |
577 | if (ret) { | |
578 | printk("failed to delete reference to %.*s, " | |
579 | "inode %lu parent %lu\n", name_len, name, | |
580 | dentry->d_inode->i_ino, | |
581 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 582 | } |
39279cc3 CM |
583 | err: |
584 | btrfs_free_path(path); | |
585 | if (!ret) { | |
586 | dir->i_size -= name_len * 2; | |
79c44584 | 587 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 588 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
589 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
590 | dentry->d_inode->i_nlink--; | |
591 | #else | |
39279cc3 | 592 | drop_nlink(dentry->d_inode); |
6da6abae | 593 | #endif |
54aa1f4d | 594 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
595 | dir->i_sb->s_dirt = 1; |
596 | } | |
597 | return ret; | |
598 | } | |
599 | ||
600 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
601 | { | |
602 | struct btrfs_root *root; | |
603 | struct btrfs_trans_handle *trans; | |
604 | int ret; | |
1832a6d5 | 605 | unsigned long nr = 0; |
39279cc3 CM |
606 | |
607 | root = BTRFS_I(dir)->root; | |
608 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
609 | |
610 | ret = btrfs_check_free_space(root, 1, 1); | |
611 | if (ret) | |
612 | goto fail; | |
613 | ||
39279cc3 | 614 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 615 | |
39279cc3 CM |
616 | btrfs_set_trans_block_group(trans, dir); |
617 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 618 | nr = trans->blocks_used; |
5f39d397 | 619 | |
39279cc3 | 620 | btrfs_end_transaction(trans, root); |
1832a6d5 | 621 | fail: |
39279cc3 | 622 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 623 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 624 | btrfs_throttle(root); |
39279cc3 CM |
625 | return ret; |
626 | } | |
627 | ||
628 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
629 | { | |
630 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 631 | int err = 0; |
39279cc3 CM |
632 | int ret; |
633 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 634 | struct btrfs_trans_handle *trans; |
1832a6d5 | 635 | unsigned long nr = 0; |
39279cc3 | 636 | |
134d4512 Y |
637 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
638 | return -ENOTEMPTY; | |
639 | ||
39279cc3 | 640 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
641 | ret = btrfs_check_free_space(root, 1, 1); |
642 | if (ret) | |
643 | goto fail; | |
644 | ||
39279cc3 CM |
645 | trans = btrfs_start_transaction(root, 1); |
646 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
647 | |
648 | /* now the directory is empty */ | |
649 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
650 | if (!err) { | |
651 | inode->i_size = 0; | |
652 | } | |
3954401f | 653 | |
d3c2fdcf | 654 | nr = trans->blocks_used; |
39279cc3 | 655 | ret = btrfs_end_transaction(trans, root); |
1832a6d5 | 656 | fail: |
134d4512 | 657 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 658 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 659 | btrfs_throttle(root); |
3954401f | 660 | |
39279cc3 CM |
661 | if (ret && !err) |
662 | err = ret; | |
663 | return err; | |
664 | } | |
665 | ||
666 | static int btrfs_free_inode(struct btrfs_trans_handle *trans, | |
667 | struct btrfs_root *root, | |
668 | struct inode *inode) | |
669 | { | |
670 | struct btrfs_path *path; | |
671 | int ret; | |
672 | ||
673 | clear_inode(inode); | |
674 | ||
675 | path = btrfs_alloc_path(); | |
676 | BUG_ON(!path); | |
39279cc3 CM |
677 | ret = btrfs_lookup_inode(trans, root, path, |
678 | &BTRFS_I(inode)->location, -1); | |
54aa1f4d CM |
679 | if (ret > 0) |
680 | ret = -ENOENT; | |
681 | if (!ret) | |
682 | ret = btrfs_del_item(trans, root, path); | |
39279cc3 CM |
683 | btrfs_free_path(path); |
684 | return ret; | |
685 | } | |
686 | ||
39279cc3 CM |
687 | /* |
688 | * this can truncate away extent items, csum items and directory items. | |
689 | * It starts at a high offset and removes keys until it can't find | |
690 | * any higher than i_size. | |
691 | * | |
692 | * csum items that cross the new i_size are truncated to the new size | |
693 | * as well. | |
694 | */ | |
695 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
696 | struct btrfs_root *root, | |
697 | struct inode *inode) | |
698 | { | |
699 | int ret; | |
700 | struct btrfs_path *path; | |
701 | struct btrfs_key key; | |
5f39d397 | 702 | struct btrfs_key found_key; |
39279cc3 | 703 | u32 found_type; |
5f39d397 | 704 | struct extent_buffer *leaf; |
39279cc3 CM |
705 | struct btrfs_file_extent_item *fi; |
706 | u64 extent_start = 0; | |
db94535d | 707 | u64 extent_num_bytes = 0; |
39279cc3 | 708 | u64 item_end = 0; |
7bb86316 | 709 | u64 root_gen = 0; |
d8d5f3e1 | 710 | u64 root_owner = 0; |
39279cc3 CM |
711 | int found_extent; |
712 | int del_item; | |
179e29e4 | 713 | int extent_type = -1; |
39279cc3 | 714 | |
a52d9a80 | 715 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 716 | path = btrfs_alloc_path(); |
3c69faec | 717 | path->reada = -1; |
39279cc3 | 718 | BUG_ON(!path); |
5f39d397 | 719 | |
39279cc3 CM |
720 | /* FIXME, add redo link to tree so we don't leak on crash */ |
721 | key.objectid = inode->i_ino; | |
722 | key.offset = (u64)-1; | |
5f39d397 CM |
723 | key.type = (u8)-1; |
724 | ||
39279cc3 CM |
725 | while(1) { |
726 | btrfs_init_path(path); | |
727 | fi = NULL; | |
728 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
729 | if (ret < 0) { | |
730 | goto error; | |
731 | } | |
732 | if (ret > 0) { | |
733 | BUG_ON(path->slots[0] == 0); | |
734 | path->slots[0]--; | |
735 | } | |
5f39d397 CM |
736 | leaf = path->nodes[0]; |
737 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
738 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 739 | |
5f39d397 | 740 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 741 | break; |
5f39d397 | 742 | |
39279cc3 CM |
743 | if (found_type != BTRFS_CSUM_ITEM_KEY && |
744 | found_type != BTRFS_DIR_ITEM_KEY && | |
745 | found_type != BTRFS_DIR_INDEX_KEY && | |
746 | found_type != BTRFS_EXTENT_DATA_KEY) | |
747 | break; | |
748 | ||
5f39d397 | 749 | item_end = found_key.offset; |
39279cc3 | 750 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 751 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 752 | struct btrfs_file_extent_item); |
179e29e4 CM |
753 | extent_type = btrfs_file_extent_type(leaf, fi); |
754 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 755 | item_end += |
db94535d | 756 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
757 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
758 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
759 | path->slots[0]); | |
760 | item_end += btrfs_file_extent_inline_len(leaf, | |
761 | item); | |
39279cc3 | 762 | } |
008630c1 | 763 | item_end--; |
39279cc3 CM |
764 | } |
765 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
766 | ret = btrfs_csum_truncate(trans, root, path, | |
767 | inode->i_size); | |
768 | BUG_ON(ret); | |
769 | } | |
008630c1 | 770 | if (item_end < inode->i_size) { |
b888db2b CM |
771 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
772 | found_type = BTRFS_INODE_ITEM_KEY; | |
773 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
774 | found_type = BTRFS_CSUM_ITEM_KEY; | |
775 | } else if (found_type) { | |
776 | found_type--; | |
777 | } else { | |
778 | break; | |
39279cc3 | 779 | } |
a61721d5 | 780 | btrfs_set_key_type(&key, found_type); |
65555a06 | 781 | btrfs_release_path(root, path); |
b888db2b | 782 | continue; |
39279cc3 | 783 | } |
5f39d397 | 784 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
785 | del_item = 1; |
786 | else | |
787 | del_item = 0; | |
788 | found_extent = 0; | |
789 | ||
790 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
791 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
792 | goto delete; | |
793 | ||
794 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 795 | u64 num_dec; |
db94535d | 796 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 797 | if (!del_item) { |
db94535d CM |
798 | u64 orig_num_bytes = |
799 | btrfs_file_extent_num_bytes(leaf, fi); | |
800 | extent_num_bytes = inode->i_size - | |
5f39d397 | 801 | found_key.offset + root->sectorsize - 1; |
db94535d CM |
802 | btrfs_set_file_extent_num_bytes(leaf, fi, |
803 | extent_num_bytes); | |
804 | num_dec = (orig_num_bytes - | |
805 | extent_num_bytes) >> 9; | |
bab9fb03 Y |
806 | if (extent_start != 0) { |
807 | inode->i_blocks -= num_dec; | |
808 | } | |
5f39d397 | 809 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 810 | } else { |
db94535d CM |
811 | extent_num_bytes = |
812 | btrfs_file_extent_disk_num_bytes(leaf, | |
813 | fi); | |
39279cc3 | 814 | /* FIXME blocksize != 4096 */ |
db94535d CM |
815 | num_dec = btrfs_file_extent_num_bytes(leaf, |
816 | fi) >> 9; | |
39279cc3 CM |
817 | if (extent_start != 0) { |
818 | found_extent = 1; | |
819 | inode->i_blocks -= num_dec; | |
820 | } | |
d8d5f3e1 CM |
821 | root_gen = btrfs_header_generation(leaf); |
822 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 823 | } |
179e29e4 CM |
824 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE && |
825 | !del_item) { | |
826 | u32 newsize = inode->i_size - found_key.offset; | |
827 | newsize = btrfs_file_extent_calc_inline_size(newsize); | |
828 | ret = btrfs_truncate_item(trans, root, path, | |
829 | newsize, 1); | |
830 | BUG_ON(ret); | |
39279cc3 | 831 | } |
179e29e4 | 832 | delete: |
39279cc3 CM |
833 | if (del_item) { |
834 | ret = btrfs_del_item(trans, root, path); | |
54aa1f4d CM |
835 | if (ret) |
836 | goto error; | |
39279cc3 CM |
837 | } else { |
838 | break; | |
839 | } | |
840 | btrfs_release_path(root, path); | |
841 | if (found_extent) { | |
842 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 843 | extent_num_bytes, |
d8d5f3e1 | 844 | root_owner, |
7bb86316 CM |
845 | root_gen, inode->i_ino, |
846 | found_key.offset, 0); | |
39279cc3 CM |
847 | BUG_ON(ret); |
848 | } | |
849 | } | |
850 | ret = 0; | |
851 | error: | |
852 | btrfs_release_path(root, path); | |
853 | btrfs_free_path(path); | |
854 | inode->i_sb->s_dirt = 1; | |
855 | return ret; | |
856 | } | |
857 | ||
b888db2b | 858 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
859 | size_t zero_start) |
860 | { | |
861 | char *kaddr; | |
b888db2b | 862 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
1832a6d5 | 863 | struct btrfs_root *root = BTRFS_I(inode)->root; |
35ebb934 | 864 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 865 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1832a6d5 CM |
866 | u64 existing_delalloc; |
867 | u64 delalloc_start; | |
868 | int ret = 0; | |
a52d9a80 | 869 | |
190662b2 | 870 | WARN_ON(!PageLocked(page)); |
b3cfa35a | 871 | set_page_extent_mapped(page); |
a52d9a80 | 872 | |
b888db2b | 873 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); |
1832a6d5 CM |
874 | delalloc_start = page_start; |
875 | existing_delalloc = count_range_bits(&BTRFS_I(inode)->extent_tree, | |
876 | &delalloc_start, page_end, | |
877 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | |
b888db2b CM |
878 | set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start, |
879 | page_end, GFP_NOFS); | |
1832a6d5 CM |
880 | |
881 | spin_lock(&root->fs_info->delalloc_lock); | |
882 | root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - existing_delalloc; | |
883 | spin_unlock(&root->fs_info->delalloc_lock); | |
884 | ||
a52d9a80 | 885 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 886 | kaddr = kmap(page); |
a52d9a80 CM |
887 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
888 | flush_dcache_page(page); | |
b888db2b | 889 | kunmap(page); |
a52d9a80 | 890 | } |
b888db2b CM |
891 | set_page_dirty(page); |
892 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
a52d9a80 | 893 | |
a52d9a80 CM |
894 | return ret; |
895 | } | |
896 | ||
39279cc3 CM |
897 | /* |
898 | * taken from block_truncate_page, but does cow as it zeros out | |
899 | * any bytes left in the last page in the file. | |
900 | */ | |
901 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
902 | { | |
903 | struct inode *inode = mapping->host; | |
db94535d CM |
904 | struct btrfs_root *root = BTRFS_I(inode)->root; |
905 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
906 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
907 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
908 | struct page *page; | |
39279cc3 | 909 | int ret = 0; |
a52d9a80 | 910 | u64 page_start; |
39279cc3 CM |
911 | |
912 | if ((offset & (blocksize - 1)) == 0) | |
913 | goto out; | |
914 | ||
915 | ret = -ENOMEM; | |
916 | page = grab_cache_page(mapping, index); | |
917 | if (!page) | |
918 | goto out; | |
39279cc3 | 919 | if (!PageUptodate(page)) { |
9ebefb18 | 920 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
921 | lock_page(page); |
922 | if (!PageUptodate(page)) { | |
923 | ret = -EIO; | |
924 | goto out; | |
925 | } | |
926 | } | |
35ebb934 | 927 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 928 | |
b888db2b | 929 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 930 | |
39279cc3 CM |
931 | unlock_page(page); |
932 | page_cache_release(page); | |
933 | out: | |
934 | return ret; | |
935 | } | |
936 | ||
937 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
938 | { | |
939 | struct inode *inode = dentry->d_inode; | |
940 | int err; | |
941 | ||
942 | err = inode_change_ok(inode, attr); | |
943 | if (err) | |
944 | return err; | |
945 | ||
946 | if (S_ISREG(inode->i_mode) && | |
947 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
948 | struct btrfs_trans_handle *trans; | |
949 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2bf5a725 CM |
950 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
951 | ||
5f39d397 | 952 | u64 mask = root->sectorsize - 1; |
39279cc3 | 953 | u64 pos = (inode->i_size + mask) & ~mask; |
2bf5a725 | 954 | u64 block_end = attr->ia_size | mask; |
39279cc3 | 955 | u64 hole_size; |
179e29e4 | 956 | u64 alloc_hint = 0; |
39279cc3 CM |
957 | |
958 | if (attr->ia_size <= pos) | |
959 | goto out; | |
960 | ||
1832a6d5 CM |
961 | mutex_lock(&root->fs_info->fs_mutex); |
962 | err = btrfs_check_free_space(root, 1, 0); | |
963 | mutex_unlock(&root->fs_info->fs_mutex); | |
964 | if (err) | |
965 | goto fail; | |
966 | ||
39279cc3 CM |
967 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
968 | ||
2bf5a725 | 969 | lock_extent(em_tree, pos, block_end, GFP_NOFS); |
39279cc3 | 970 | hole_size = (attr->ia_size - pos + mask) & ~mask; |
39279cc3 CM |
971 | |
972 | mutex_lock(&root->fs_info->fs_mutex); | |
973 | trans = btrfs_start_transaction(root, 1); | |
974 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 975 | err = btrfs_drop_extents(trans, root, inode, |
3326d1b0 CM |
976 | pos, pos + hole_size, pos, |
977 | &alloc_hint); | |
2bf5a725 | 978 | |
179e29e4 CM |
979 | if (alloc_hint != EXTENT_MAP_INLINE) { |
980 | err = btrfs_insert_file_extent(trans, root, | |
981 | inode->i_ino, | |
982 | pos, 0, 0, hole_size); | |
983 | } | |
39279cc3 CM |
984 | btrfs_end_transaction(trans, root); |
985 | mutex_unlock(&root->fs_info->fs_mutex); | |
2bf5a725 | 986 | unlock_extent(em_tree, pos, block_end, GFP_NOFS); |
54aa1f4d CM |
987 | if (err) |
988 | return err; | |
39279cc3 CM |
989 | } |
990 | out: | |
991 | err = inode_setattr(inode, attr); | |
1832a6d5 | 992 | fail: |
39279cc3 CM |
993 | return err; |
994 | } | |
995 | void btrfs_delete_inode(struct inode *inode) | |
996 | { | |
997 | struct btrfs_trans_handle *trans; | |
998 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 999 | unsigned long nr; |
39279cc3 CM |
1000 | int ret; |
1001 | ||
1002 | truncate_inode_pages(&inode->i_data, 0); | |
1003 | if (is_bad_inode(inode)) { | |
1004 | goto no_delete; | |
1005 | } | |
5f39d397 | 1006 | |
39279cc3 CM |
1007 | inode->i_size = 0; |
1008 | mutex_lock(&root->fs_info->fs_mutex); | |
1009 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1010 | |
39279cc3 CM |
1011 | btrfs_set_trans_block_group(trans, inode); |
1012 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
5103e947 JB |
1013 | if (ret) |
1014 | goto no_delete_lock; | |
1015 | ret = btrfs_delete_xattrs(trans, root, inode); | |
54aa1f4d CM |
1016 | if (ret) |
1017 | goto no_delete_lock; | |
1018 | ret = btrfs_free_inode(trans, root, inode); | |
1019 | if (ret) | |
1020 | goto no_delete_lock; | |
d3c2fdcf | 1021 | nr = trans->blocks_used; |
5f39d397 | 1022 | |
39279cc3 CM |
1023 | btrfs_end_transaction(trans, root); |
1024 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1025 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1026 | btrfs_throttle(root); |
39279cc3 | 1027 | return; |
54aa1f4d CM |
1028 | |
1029 | no_delete_lock: | |
d3c2fdcf | 1030 | nr = trans->blocks_used; |
54aa1f4d CM |
1031 | btrfs_end_transaction(trans, root); |
1032 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1033 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1034 | btrfs_throttle(root); |
39279cc3 CM |
1035 | no_delete: |
1036 | clear_inode(inode); | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * this returns the key found in the dir entry in the location pointer. | |
1041 | * If no dir entries were found, location->objectid is 0. | |
1042 | */ | |
1043 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1044 | struct btrfs_key *location) | |
1045 | { | |
1046 | const char *name = dentry->d_name.name; | |
1047 | int namelen = dentry->d_name.len; | |
1048 | struct btrfs_dir_item *di; | |
1049 | struct btrfs_path *path; | |
1050 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1051 | int ret = 0; |
39279cc3 | 1052 | |
3954401f CM |
1053 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1054 | location->objectid = dir->i_ino; | |
1055 | location->type = BTRFS_INODE_ITEM_KEY; | |
1056 | location->offset = 0; | |
1057 | return 0; | |
1058 | } | |
39279cc3 CM |
1059 | path = btrfs_alloc_path(); |
1060 | BUG_ON(!path); | |
3954401f | 1061 | |
7a720536 | 1062 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1063 | struct btrfs_key key; |
1064 | struct extent_buffer *leaf; | |
1065 | u32 nritems; | |
1066 | int slot; | |
1067 | ||
1068 | key.objectid = dir->i_ino; | |
1069 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1070 | key.offset = 0; | |
1071 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1072 | BUG_ON(ret == 0); | |
1073 | ret = 0; | |
1074 | ||
1075 | leaf = path->nodes[0]; | |
1076 | slot = path->slots[0]; | |
1077 | nritems = btrfs_header_nritems(leaf); | |
1078 | if (slot >= nritems) | |
1079 | goto out_err; | |
1080 | ||
1081 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1082 | if (key.objectid != dir->i_ino || | |
1083 | key.type != BTRFS_INODE_REF_KEY) { | |
1084 | goto out_err; | |
1085 | } | |
1086 | location->objectid = key.offset; | |
1087 | location->type = BTRFS_INODE_ITEM_KEY; | |
1088 | location->offset = 0; | |
1089 | goto out; | |
1090 | } | |
1091 | ||
39279cc3 CM |
1092 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1093 | namelen, 0); | |
0d9f7f3e Y |
1094 | if (IS_ERR(di)) |
1095 | ret = PTR_ERR(di); | |
39279cc3 | 1096 | if (!di || IS_ERR(di)) { |
3954401f | 1097 | goto out_err; |
39279cc3 | 1098 | } |
5f39d397 | 1099 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1100 | out: |
39279cc3 CM |
1101 | btrfs_free_path(path); |
1102 | return ret; | |
3954401f CM |
1103 | out_err: |
1104 | location->objectid = 0; | |
1105 | goto out; | |
39279cc3 CM |
1106 | } |
1107 | ||
1108 | /* | |
1109 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1110 | * needs to be changed to reflect the root directory of the tree root. This | |
1111 | * is kind of like crossing a mount point. | |
1112 | */ | |
1113 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1114 | struct btrfs_key *location, | |
58176a96 JB |
1115 | struct btrfs_root **sub_root, |
1116 | struct dentry *dentry) | |
39279cc3 CM |
1117 | { |
1118 | struct btrfs_path *path; | |
1119 | struct btrfs_root_item *ri; | |
1120 | ||
1121 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1122 | return 0; | |
1123 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1124 | return 0; | |
1125 | ||
1126 | path = btrfs_alloc_path(); | |
1127 | BUG_ON(!path); | |
1128 | mutex_lock(&root->fs_info->fs_mutex); | |
1129 | ||
58176a96 JB |
1130 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1131 | dentry->d_name.name, | |
1132 | dentry->d_name.len); | |
39279cc3 CM |
1133 | if (IS_ERR(*sub_root)) |
1134 | return PTR_ERR(*sub_root); | |
1135 | ||
1136 | ri = &(*sub_root)->root_item; | |
1137 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1138 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1139 | location->offset = 0; | |
1140 | ||
1141 | btrfs_free_path(path); | |
1142 | mutex_unlock(&root->fs_info->fs_mutex); | |
1143 | return 0; | |
1144 | } | |
1145 | ||
1146 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1147 | { | |
1148 | struct btrfs_iget_args *args = p; | |
1149 | inode->i_ino = args->ino; | |
1150 | BTRFS_I(inode)->root = args->root; | |
b888db2b CM |
1151 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1152 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
1153 | return 0; |
1154 | } | |
1155 | ||
1156 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1157 | { | |
1158 | struct btrfs_iget_args *args = opaque; | |
1159 | return (args->ino == inode->i_ino && | |
1160 | args->root == BTRFS_I(inode)->root); | |
1161 | } | |
1162 | ||
dc17ff8f CM |
1163 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1164 | u64 root_objectid) | |
1165 | { | |
1166 | struct btrfs_iget_args args; | |
1167 | args.ino = objectid; | |
1168 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1169 | ||
1170 | if (!args.root) | |
1171 | return NULL; | |
1172 | ||
1173 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1174 | } | |
1175 | ||
39279cc3 CM |
1176 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1177 | struct btrfs_root *root) | |
1178 | { | |
1179 | struct inode *inode; | |
1180 | struct btrfs_iget_args args; | |
1181 | args.ino = objectid; | |
1182 | args.root = root; | |
1183 | ||
1184 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1185 | btrfs_init_locked_inode, | |
1186 | (void *)&args); | |
1187 | return inode; | |
1188 | } | |
1189 | ||
1190 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1191 | struct nameidata *nd) | |
1192 | { | |
1193 | struct inode * inode; | |
1194 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1195 | struct btrfs_root *root = bi->root; | |
1196 | struct btrfs_root *sub_root = root; | |
1197 | struct btrfs_key location; | |
1198 | int ret; | |
1199 | ||
1200 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1201 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1202 | |
39279cc3 CM |
1203 | mutex_lock(&root->fs_info->fs_mutex); |
1204 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1205 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1206 | |
39279cc3 CM |
1207 | if (ret < 0) |
1208 | return ERR_PTR(ret); | |
5f39d397 | 1209 | |
39279cc3 CM |
1210 | inode = NULL; |
1211 | if (location.objectid) { | |
58176a96 JB |
1212 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1213 | dentry); | |
39279cc3 CM |
1214 | if (ret < 0) |
1215 | return ERR_PTR(ret); | |
1216 | if (ret > 0) | |
1217 | return ERR_PTR(-ENOENT); | |
1218 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1219 | sub_root); | |
1220 | if (!inode) | |
1221 | return ERR_PTR(-EACCES); | |
1222 | if (inode->i_state & I_NEW) { | |
1223 | /* the inode and parent dir are two different roots */ | |
1224 | if (sub_root != root) { | |
1225 | igrab(inode); | |
1226 | sub_root->inode = inode; | |
1227 | } | |
1228 | BTRFS_I(inode)->root = sub_root; | |
1229 | memcpy(&BTRFS_I(inode)->location, &location, | |
1230 | sizeof(location)); | |
1231 | btrfs_read_locked_inode(inode); | |
1232 | unlock_new_inode(inode); | |
1233 | } | |
1234 | } | |
1235 | return d_splice_alias(inode, dentry); | |
1236 | } | |
1237 | ||
39279cc3 CM |
1238 | static unsigned char btrfs_filetype_table[] = { |
1239 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1240 | }; | |
1241 | ||
1242 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1243 | { | |
6da6abae | 1244 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1245 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1246 | struct btrfs_item *item; | |
1247 | struct btrfs_dir_item *di; | |
1248 | struct btrfs_key key; | |
5f39d397 | 1249 | struct btrfs_key found_key; |
39279cc3 CM |
1250 | struct btrfs_path *path; |
1251 | int ret; | |
1252 | u32 nritems; | |
5f39d397 | 1253 | struct extent_buffer *leaf; |
39279cc3 CM |
1254 | int slot; |
1255 | int advance; | |
1256 | unsigned char d_type; | |
1257 | int over = 0; | |
1258 | u32 di_cur; | |
1259 | u32 di_total; | |
1260 | u32 di_len; | |
1261 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1262 | char tmp_name[32]; |
1263 | char *name_ptr; | |
1264 | int name_len; | |
39279cc3 CM |
1265 | |
1266 | /* FIXME, use a real flag for deciding about the key type */ | |
1267 | if (root->fs_info->tree_root == root) | |
1268 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1269 | |
3954401f CM |
1270 | /* special case for "." */ |
1271 | if (filp->f_pos == 0) { | |
1272 | over = filldir(dirent, ".", 1, | |
1273 | 1, inode->i_ino, | |
1274 | DT_DIR); | |
1275 | if (over) | |
1276 | return 0; | |
1277 | filp->f_pos = 1; | |
1278 | } | |
1279 | ||
39279cc3 CM |
1280 | mutex_lock(&root->fs_info->fs_mutex); |
1281 | key.objectid = inode->i_ino; | |
3954401f CM |
1282 | path = btrfs_alloc_path(); |
1283 | path->reada = 2; | |
1284 | ||
1285 | /* special case for .., just use the back ref */ | |
1286 | if (filp->f_pos == 1) { | |
1287 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1288 | key.offset = 0; | |
1289 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1290 | BUG_ON(ret == 0); | |
1291 | leaf = path->nodes[0]; | |
1292 | slot = path->slots[0]; | |
1293 | nritems = btrfs_header_nritems(leaf); | |
1294 | if (slot >= nritems) { | |
1295 | btrfs_release_path(root, path); | |
1296 | goto read_dir_items; | |
1297 | } | |
1298 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1299 | btrfs_release_path(root, path); | |
1300 | if (found_key.objectid != key.objectid || | |
1301 | found_key.type != BTRFS_INODE_REF_KEY) | |
1302 | goto read_dir_items; | |
1303 | over = filldir(dirent, "..", 2, | |
1304 | 2, found_key.offset, DT_DIR); | |
1305 | if (over) | |
1306 | goto nopos; | |
1307 | filp->f_pos = 2; | |
1308 | } | |
1309 | ||
1310 | read_dir_items: | |
39279cc3 CM |
1311 | btrfs_set_key_type(&key, key_type); |
1312 | key.offset = filp->f_pos; | |
5f39d397 | 1313 | |
39279cc3 CM |
1314 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1315 | if (ret < 0) | |
1316 | goto err; | |
1317 | advance = 0; | |
39279cc3 | 1318 | while(1) { |
5f39d397 CM |
1319 | leaf = path->nodes[0]; |
1320 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1321 | slot = path->slots[0]; |
1322 | if (advance || slot >= nritems) { | |
1323 | if (slot >= nritems -1) { | |
39279cc3 CM |
1324 | ret = btrfs_next_leaf(root, path); |
1325 | if (ret) | |
1326 | break; | |
5f39d397 CM |
1327 | leaf = path->nodes[0]; |
1328 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1329 | slot = path->slots[0]; |
1330 | } else { | |
1331 | slot++; | |
1332 | path->slots[0]++; | |
1333 | } | |
1334 | } | |
1335 | advance = 1; | |
5f39d397 CM |
1336 | item = btrfs_item_nr(leaf, slot); |
1337 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1338 | ||
1339 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1340 | break; |
5f39d397 | 1341 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1342 | break; |
5f39d397 | 1343 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1344 | continue; |
5f39d397 CM |
1345 | |
1346 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1347 | advance = 1; |
1348 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1349 | di_cur = 0; | |
5f39d397 | 1350 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1351 | while(di_cur < di_total) { |
5f39d397 CM |
1352 | struct btrfs_key location; |
1353 | ||
1354 | name_len = btrfs_dir_name_len(leaf, di); | |
1355 | if (name_len < 32) { | |
1356 | name_ptr = tmp_name; | |
1357 | } else { | |
1358 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1359 | BUG_ON(!name_ptr); | |
1360 | } | |
1361 | read_extent_buffer(leaf, name_ptr, | |
1362 | (unsigned long)(di + 1), name_len); | |
1363 | ||
1364 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1365 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
1366 | over = filldir(dirent, name_ptr, name_len, |
1367 | found_key.offset, | |
1368 | location.objectid, | |
39279cc3 | 1369 | d_type); |
5f39d397 CM |
1370 | |
1371 | if (name_ptr != tmp_name) | |
1372 | kfree(name_ptr); | |
1373 | ||
39279cc3 CM |
1374 | if (over) |
1375 | goto nopos; | |
5103e947 JB |
1376 | di_len = btrfs_dir_name_len(leaf, di) + |
1377 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1378 | di_cur += di_len; |
1379 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1380 | } | |
1381 | } | |
1382 | filp->f_pos++; | |
1383 | nopos: | |
1384 | ret = 0; | |
1385 | err: | |
1386 | btrfs_release_path(root, path); | |
1387 | btrfs_free_path(path); | |
1388 | mutex_unlock(&root->fs_info->fs_mutex); | |
1389 | return ret; | |
1390 | } | |
1391 | ||
1392 | int btrfs_write_inode(struct inode *inode, int wait) | |
1393 | { | |
1394 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1395 | struct btrfs_trans_handle *trans; | |
1396 | int ret = 0; | |
1397 | ||
1398 | if (wait) { | |
1399 | mutex_lock(&root->fs_info->fs_mutex); | |
1400 | trans = btrfs_start_transaction(root, 1); | |
1401 | btrfs_set_trans_block_group(trans, inode); | |
1402 | ret = btrfs_commit_transaction(trans, root); | |
1403 | mutex_unlock(&root->fs_info->fs_mutex); | |
1404 | } | |
1405 | return ret; | |
1406 | } | |
1407 | ||
1408 | /* | |
54aa1f4d | 1409 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1410 | * inode changes. But, it is most likely to find the inode in cache. |
1411 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1412 | * to keep or drop this code. | |
1413 | */ | |
1414 | void btrfs_dirty_inode(struct inode *inode) | |
1415 | { | |
1416 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1417 | struct btrfs_trans_handle *trans; | |
1418 | ||
1419 | mutex_lock(&root->fs_info->fs_mutex); | |
1420 | trans = btrfs_start_transaction(root, 1); | |
1421 | btrfs_set_trans_block_group(trans, inode); | |
1422 | btrfs_update_inode(trans, root, inode); | |
1423 | btrfs_end_transaction(trans, root); | |
1424 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1425 | } |
1426 | ||
1427 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1428 | struct btrfs_root *root, | |
1429 | u64 objectid, | |
1430 | struct btrfs_block_group_cache *group, | |
1431 | int mode) | |
1432 | { | |
1433 | struct inode *inode; | |
5f39d397 | 1434 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1435 | struct btrfs_key *location; |
5f39d397 | 1436 | struct btrfs_path *path; |
39279cc3 CM |
1437 | int ret; |
1438 | int owner; | |
1439 | ||
5f39d397 CM |
1440 | path = btrfs_alloc_path(); |
1441 | BUG_ON(!path); | |
1442 | ||
39279cc3 CM |
1443 | inode = new_inode(root->fs_info->sb); |
1444 | if (!inode) | |
1445 | return ERR_PTR(-ENOMEM); | |
1446 | ||
b888db2b CM |
1447 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1448 | inode->i_mapping, GFP_NOFS); | |
39279cc3 | 1449 | BTRFS_I(inode)->root = root; |
b888db2b | 1450 | |
39279cc3 CM |
1451 | if (mode & S_IFDIR) |
1452 | owner = 0; | |
1453 | else | |
1454 | owner = 1; | |
1455 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1456 | BTRFS_I(inode)->block_group = group; | |
1457 | ||
5f39d397 CM |
1458 | ret = btrfs_insert_empty_inode(trans, root, path, objectid); |
1459 | if (ret) | |
1460 | goto fail; | |
1461 | ||
39279cc3 CM |
1462 | inode->i_uid = current->fsuid; |
1463 | inode->i_gid = current->fsgid; | |
1464 | inode->i_mode = mode; | |
1465 | inode->i_ino = objectid; | |
1466 | inode->i_blocks = 0; | |
1467 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1468 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1469 | struct btrfs_inode_item); | |
1470 | fill_inode_item(path->nodes[0], inode_item, inode); | |
1471 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
1472 | btrfs_free_path(path); | |
1473 | ||
39279cc3 CM |
1474 | location = &BTRFS_I(inode)->location; |
1475 | location->objectid = objectid; | |
39279cc3 CM |
1476 | location->offset = 0; |
1477 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1478 | ||
39279cc3 CM |
1479 | insert_inode_hash(inode); |
1480 | return inode; | |
5f39d397 CM |
1481 | fail: |
1482 | btrfs_free_path(path); | |
1483 | return ERR_PTR(ret); | |
39279cc3 CM |
1484 | } |
1485 | ||
1486 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1487 | { | |
1488 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1489 | } | |
1490 | ||
1491 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
1492 | struct dentry *dentry, struct inode *inode) | |
1493 | { | |
1494 | int ret; | |
1495 | struct btrfs_key key; | |
1496 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1497 | struct inode *parent_inode; |
5f39d397 | 1498 | |
39279cc3 | 1499 | key.objectid = inode->i_ino; |
39279cc3 CM |
1500 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1501 | key.offset = 0; | |
1502 | ||
1503 | ret = btrfs_insert_dir_item(trans, root, | |
1504 | dentry->d_name.name, dentry->d_name.len, | |
1505 | dentry->d_parent->d_inode->i_ino, | |
1506 | &key, btrfs_inode_type(inode)); | |
1507 | if (ret == 0) { | |
76fea00a CM |
1508 | ret = btrfs_insert_inode_ref(trans, root, |
1509 | dentry->d_name.name, | |
1510 | dentry->d_name.len, | |
1511 | inode->i_ino, | |
1512 | dentry->d_parent->d_inode->i_ino); | |
79c44584 CM |
1513 | parent_inode = dentry->d_parent->d_inode; |
1514 | parent_inode->i_size += dentry->d_name.len * 2; | |
1515 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1516 | ret = btrfs_update_inode(trans, root, |
1517 | dentry->d_parent->d_inode); | |
1518 | } | |
1519 | return ret; | |
1520 | } | |
1521 | ||
1522 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
1523 | struct dentry *dentry, struct inode *inode) | |
1524 | { | |
1525 | int err = btrfs_add_link(trans, dentry, inode); | |
1526 | if (!err) { | |
1527 | d_instantiate(dentry, inode); | |
1528 | return 0; | |
1529 | } | |
1530 | if (err > 0) | |
1531 | err = -EEXIST; | |
1532 | return err; | |
1533 | } | |
1534 | ||
618e21d5 JB |
1535 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1536 | int mode, dev_t rdev) | |
1537 | { | |
1538 | struct btrfs_trans_handle *trans; | |
1539 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1540 | struct inode *inode = NULL; |
618e21d5 JB |
1541 | int err; |
1542 | int drop_inode = 0; | |
1543 | u64 objectid; | |
1832a6d5 | 1544 | unsigned long nr = 0; |
618e21d5 JB |
1545 | |
1546 | if (!new_valid_dev(rdev)) | |
1547 | return -EINVAL; | |
1548 | ||
1549 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1550 | err = btrfs_check_free_space(root, 1, 0); |
1551 | if (err) | |
1552 | goto fail; | |
1553 | ||
618e21d5 JB |
1554 | trans = btrfs_start_transaction(root, 1); |
1555 | btrfs_set_trans_block_group(trans, dir); | |
1556 | ||
1557 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1558 | if (err) { | |
1559 | err = -ENOSPC; | |
1560 | goto out_unlock; | |
1561 | } | |
1562 | ||
1563 | inode = btrfs_new_inode(trans, root, objectid, | |
1564 | BTRFS_I(dir)->block_group, mode); | |
1565 | err = PTR_ERR(inode); | |
1566 | if (IS_ERR(inode)) | |
1567 | goto out_unlock; | |
1568 | ||
1569 | btrfs_set_trans_block_group(trans, inode); | |
1570 | err = btrfs_add_nondir(trans, dentry, inode); | |
1571 | if (err) | |
1572 | drop_inode = 1; | |
1573 | else { | |
1574 | inode->i_op = &btrfs_special_inode_operations; | |
1575 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1576 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1577 | } |
1578 | dir->i_sb->s_dirt = 1; | |
1579 | btrfs_update_inode_block_group(trans, inode); | |
1580 | btrfs_update_inode_block_group(trans, dir); | |
1581 | out_unlock: | |
d3c2fdcf | 1582 | nr = trans->blocks_used; |
618e21d5 | 1583 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1584 | fail: |
618e21d5 JB |
1585 | mutex_unlock(&root->fs_info->fs_mutex); |
1586 | ||
1587 | if (drop_inode) { | |
1588 | inode_dec_link_count(inode); | |
1589 | iput(inode); | |
1590 | } | |
d3c2fdcf | 1591 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1592 | btrfs_throttle(root); |
618e21d5 JB |
1593 | return err; |
1594 | } | |
1595 | ||
39279cc3 CM |
1596 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1597 | int mode, struct nameidata *nd) | |
1598 | { | |
1599 | struct btrfs_trans_handle *trans; | |
1600 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1601 | struct inode *inode = NULL; |
39279cc3 CM |
1602 | int err; |
1603 | int drop_inode = 0; | |
1832a6d5 | 1604 | unsigned long nr = 0; |
39279cc3 CM |
1605 | u64 objectid; |
1606 | ||
1607 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1608 | err = btrfs_check_free_space(root, 1, 0); |
1609 | if (err) | |
1610 | goto fail; | |
39279cc3 CM |
1611 | trans = btrfs_start_transaction(root, 1); |
1612 | btrfs_set_trans_block_group(trans, dir); | |
1613 | ||
1614 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1615 | if (err) { | |
1616 | err = -ENOSPC; | |
1617 | goto out_unlock; | |
1618 | } | |
1619 | ||
1620 | inode = btrfs_new_inode(trans, root, objectid, | |
1621 | BTRFS_I(dir)->block_group, mode); | |
1622 | err = PTR_ERR(inode); | |
1623 | if (IS_ERR(inode)) | |
1624 | goto out_unlock; | |
1625 | ||
1626 | btrfs_set_trans_block_group(trans, inode); | |
1627 | err = btrfs_add_nondir(trans, dentry, inode); | |
1628 | if (err) | |
1629 | drop_inode = 1; | |
1630 | else { | |
1631 | inode->i_mapping->a_ops = &btrfs_aops; | |
1632 | inode->i_fop = &btrfs_file_operations; | |
1633 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
1634 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
1635 | inode->i_mapping, GFP_NOFS); | |
07157aac | 1636 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
1637 | } |
1638 | dir->i_sb->s_dirt = 1; | |
1639 | btrfs_update_inode_block_group(trans, inode); | |
1640 | btrfs_update_inode_block_group(trans, dir); | |
1641 | out_unlock: | |
d3c2fdcf | 1642 | nr = trans->blocks_used; |
39279cc3 | 1643 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1644 | fail: |
39279cc3 CM |
1645 | mutex_unlock(&root->fs_info->fs_mutex); |
1646 | ||
1647 | if (drop_inode) { | |
1648 | inode_dec_link_count(inode); | |
1649 | iput(inode); | |
1650 | } | |
d3c2fdcf | 1651 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1652 | btrfs_throttle(root); |
39279cc3 CM |
1653 | return err; |
1654 | } | |
1655 | ||
1656 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1657 | struct dentry *dentry) | |
1658 | { | |
1659 | struct btrfs_trans_handle *trans; | |
1660 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1661 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 1662 | unsigned long nr = 0; |
39279cc3 CM |
1663 | int err; |
1664 | int drop_inode = 0; | |
1665 | ||
1666 | if (inode->i_nlink == 0) | |
1667 | return -ENOENT; | |
1668 | ||
6da6abae CM |
1669 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1670 | inode->i_nlink++; | |
1671 | #else | |
39279cc3 | 1672 | inc_nlink(inode); |
6da6abae | 1673 | #endif |
39279cc3 | 1674 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
1675 | err = btrfs_check_free_space(root, 1, 0); |
1676 | if (err) | |
1677 | goto fail; | |
39279cc3 | 1678 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1679 | |
39279cc3 CM |
1680 | btrfs_set_trans_block_group(trans, dir); |
1681 | atomic_inc(&inode->i_count); | |
1682 | err = btrfs_add_nondir(trans, dentry, inode); | |
5f39d397 | 1683 | |
39279cc3 CM |
1684 | if (err) |
1685 | drop_inode = 1; | |
5f39d397 | 1686 | |
39279cc3 CM |
1687 | dir->i_sb->s_dirt = 1; |
1688 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1689 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1690 | |
54aa1f4d CM |
1691 | if (err) |
1692 | drop_inode = 1; | |
39279cc3 | 1693 | |
d3c2fdcf | 1694 | nr = trans->blocks_used; |
39279cc3 | 1695 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1696 | fail: |
39279cc3 CM |
1697 | mutex_unlock(&root->fs_info->fs_mutex); |
1698 | ||
1699 | if (drop_inode) { | |
1700 | inode_dec_link_count(inode); | |
1701 | iput(inode); | |
1702 | } | |
d3c2fdcf | 1703 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1704 | btrfs_throttle(root); |
39279cc3 CM |
1705 | return err; |
1706 | } | |
1707 | ||
39279cc3 CM |
1708 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
1709 | { | |
1710 | struct inode *inode; | |
1711 | struct btrfs_trans_handle *trans; | |
1712 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1713 | int err = 0; | |
1714 | int drop_on_err = 0; | |
1715 | u64 objectid; | |
d3c2fdcf | 1716 | unsigned long nr = 1; |
39279cc3 CM |
1717 | |
1718 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1719 | err = btrfs_check_free_space(root, 1, 0); |
1720 | if (err) | |
1721 | goto out_unlock; | |
1722 | ||
39279cc3 CM |
1723 | trans = btrfs_start_transaction(root, 1); |
1724 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1725 | |
39279cc3 CM |
1726 | if (IS_ERR(trans)) { |
1727 | err = PTR_ERR(trans); | |
1728 | goto out_unlock; | |
1729 | } | |
1730 | ||
1731 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1732 | if (err) { | |
1733 | err = -ENOSPC; | |
1734 | goto out_unlock; | |
1735 | } | |
1736 | ||
1737 | inode = btrfs_new_inode(trans, root, objectid, | |
1738 | BTRFS_I(dir)->block_group, S_IFDIR | mode); | |
1739 | if (IS_ERR(inode)) { | |
1740 | err = PTR_ERR(inode); | |
1741 | goto out_fail; | |
1742 | } | |
5f39d397 | 1743 | |
39279cc3 CM |
1744 | drop_on_err = 1; |
1745 | inode->i_op = &btrfs_dir_inode_operations; | |
1746 | inode->i_fop = &btrfs_dir_file_operations; | |
1747 | btrfs_set_trans_block_group(trans, inode); | |
1748 | ||
3954401f | 1749 | inode->i_size = 0; |
39279cc3 CM |
1750 | err = btrfs_update_inode(trans, root, inode); |
1751 | if (err) | |
1752 | goto out_fail; | |
5f39d397 | 1753 | |
39279cc3 CM |
1754 | err = btrfs_add_link(trans, dentry, inode); |
1755 | if (err) | |
1756 | goto out_fail; | |
5f39d397 | 1757 | |
39279cc3 CM |
1758 | d_instantiate(dentry, inode); |
1759 | drop_on_err = 0; | |
1760 | dir->i_sb->s_dirt = 1; | |
1761 | btrfs_update_inode_block_group(trans, inode); | |
1762 | btrfs_update_inode_block_group(trans, dir); | |
1763 | ||
1764 | out_fail: | |
d3c2fdcf | 1765 | nr = trans->blocks_used; |
39279cc3 | 1766 | btrfs_end_transaction(trans, root); |
5f39d397 | 1767 | |
39279cc3 CM |
1768 | out_unlock: |
1769 | mutex_unlock(&root->fs_info->fs_mutex); | |
1770 | if (drop_on_err) | |
1771 | iput(inode); | |
d3c2fdcf | 1772 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1773 | btrfs_throttle(root); |
39279cc3 CM |
1774 | return err; |
1775 | } | |
1776 | ||
a52d9a80 CM |
1777 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
1778 | size_t page_offset, u64 start, u64 end, | |
1779 | int create) | |
1780 | { | |
1781 | int ret; | |
1782 | int err = 0; | |
db94535d | 1783 | u64 bytenr; |
a52d9a80 CM |
1784 | u64 extent_start = 0; |
1785 | u64 extent_end = 0; | |
1786 | u64 objectid = inode->i_ino; | |
1787 | u32 found_type; | |
1788 | int failed_insert = 0; | |
1789 | struct btrfs_path *path; | |
1790 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1791 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1792 | struct extent_buffer *leaf; |
1793 | struct btrfs_key found_key; | |
a52d9a80 CM |
1794 | struct extent_map *em = NULL; |
1795 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
1796 | struct btrfs_trans_handle *trans = NULL; | |
1797 | ||
1798 | path = btrfs_alloc_path(); | |
1799 | BUG_ON(!path); | |
1800 | mutex_lock(&root->fs_info->fs_mutex); | |
1801 | ||
1802 | again: | |
1803 | em = lookup_extent_mapping(em_tree, start, end); | |
1804 | if (em) { | |
56b453c9 CM |
1805 | if (em->start > start) { |
1806 | printk("get_extent start %Lu em start %Lu\n", | |
1807 | start, em->start); | |
1808 | WARN_ON(1); | |
1809 | } | |
a52d9a80 CM |
1810 | goto out; |
1811 | } | |
1812 | if (!em) { | |
1813 | em = alloc_extent_map(GFP_NOFS); | |
1814 | if (!em) { | |
1815 | err = -ENOMEM; | |
1816 | goto out; | |
1817 | } | |
5f39d397 CM |
1818 | em->start = EXTENT_MAP_HOLE; |
1819 | em->end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1820 | } |
1821 | em->bdev = inode->i_sb->s_bdev; | |
179e29e4 CM |
1822 | ret = btrfs_lookup_file_extent(trans, root, path, |
1823 | objectid, start, trans != NULL); | |
a52d9a80 CM |
1824 | if (ret < 0) { |
1825 | err = ret; | |
1826 | goto out; | |
1827 | } | |
1828 | ||
1829 | if (ret != 0) { | |
1830 | if (path->slots[0] == 0) | |
1831 | goto not_found; | |
1832 | path->slots[0]--; | |
1833 | } | |
1834 | ||
5f39d397 CM |
1835 | leaf = path->nodes[0]; |
1836 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1837 | struct btrfs_file_extent_item); |
a52d9a80 | 1838 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1839 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1840 | found_type = btrfs_key_type(&found_key); | |
1841 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1842 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1843 | goto not_found; | |
1844 | } | |
1845 | ||
5f39d397 CM |
1846 | found_type = btrfs_file_extent_type(leaf, item); |
1847 | extent_start = found_key.offset; | |
a52d9a80 CM |
1848 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1849 | extent_end = extent_start + | |
db94535d | 1850 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1851 | err = 0; |
b888db2b | 1852 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1853 | em->start = start; |
1854 | if (start < extent_start) { | |
b888db2b CM |
1855 | if (end < extent_start) |
1856 | goto not_found; | |
a52d9a80 CM |
1857 | em->end = extent_end - 1; |
1858 | } else { | |
1859 | em->end = end; | |
1860 | } | |
1861 | goto not_found_em; | |
1862 | } | |
db94535d CM |
1863 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1864 | if (bytenr == 0) { | |
a52d9a80 CM |
1865 | em->start = extent_start; |
1866 | em->end = extent_end - 1; | |
5f39d397 CM |
1867 | em->block_start = EXTENT_MAP_HOLE; |
1868 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1869 | goto insert; |
1870 | } | |
db94535d CM |
1871 | bytenr += btrfs_file_extent_offset(leaf, item); |
1872 | em->block_start = bytenr; | |
a52d9a80 | 1873 | em->block_end = em->block_start + |
db94535d | 1874 | btrfs_file_extent_num_bytes(leaf, item) - 1; |
a52d9a80 CM |
1875 | em->start = extent_start; |
1876 | em->end = extent_end - 1; | |
1877 | goto insert; | |
1878 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1879 | unsigned long ptr; |
a52d9a80 | 1880 | char *map; |
3326d1b0 CM |
1881 | size_t size; |
1882 | size_t extent_offset; | |
1883 | size_t copy_size; | |
a52d9a80 | 1884 | |
5f39d397 CM |
1885 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1886 | path->slots[0])); | |
689f9346 | 1887 | extent_end = (extent_start + size - 1) | |
db94535d | 1888 | ((u64)root->sectorsize - 1); |
b888db2b | 1889 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1890 | em->start = start; |
1891 | if (start < extent_start) { | |
b888db2b CM |
1892 | if (end < extent_start) |
1893 | goto not_found; | |
50b78c24 | 1894 | em->end = extent_end; |
a52d9a80 CM |
1895 | } else { |
1896 | em->end = end; | |
1897 | } | |
1898 | goto not_found_em; | |
1899 | } | |
689f9346 Y |
1900 | em->block_start = EXTENT_MAP_INLINE; |
1901 | em->block_end = EXTENT_MAP_INLINE; | |
1902 | ||
1903 | if (!page) { | |
1904 | em->start = extent_start; | |
1905 | em->end = extent_start + size - 1; | |
1906 | goto out; | |
1907 | } | |
5f39d397 | 1908 | |
35ebb934 | 1909 | extent_offset = ((u64)page->index << PAGE_CACHE_SHIFT) - |
689f9346 | 1910 | extent_start + page_offset; |
ae2f5411 | 1911 | copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset, |
3326d1b0 | 1912 | size - extent_offset); |
3326d1b0 CM |
1913 | em->start = extent_start + extent_offset; |
1914 | em->end = (em->start + copy_size -1) | | |
1915 | ((u64)root->sectorsize -1); | |
689f9346 Y |
1916 | map = kmap(page); |
1917 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 CM |
1918 | if (create == 0 && !PageUptodate(page)) { |
1919 | read_extent_buffer(leaf, map + page_offset, ptr, | |
1920 | copy_size); | |
1921 | flush_dcache_page(page); | |
1922 | } else if (create && PageUptodate(page)) { | |
1923 | if (!trans) { | |
1924 | kunmap(page); | |
1925 | free_extent_map(em); | |
1926 | em = NULL; | |
1927 | btrfs_release_path(root, path); | |
1928 | trans = btrfs_start_transaction(root, 1); | |
1929 | goto again; | |
1930 | } | |
1931 | write_extent_buffer(leaf, map + page_offset, ptr, | |
1932 | copy_size); | |
1933 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 1934 | } |
a52d9a80 | 1935 | kunmap(page); |
3326d1b0 | 1936 | set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS); |
a52d9a80 CM |
1937 | goto insert; |
1938 | } else { | |
1939 | printk("unkknown found_type %d\n", found_type); | |
1940 | WARN_ON(1); | |
1941 | } | |
1942 | not_found: | |
1943 | em->start = start; | |
1944 | em->end = end; | |
1945 | not_found_em: | |
5f39d397 CM |
1946 | em->block_start = EXTENT_MAP_HOLE; |
1947 | em->block_end = EXTENT_MAP_HOLE; | |
a52d9a80 CM |
1948 | insert: |
1949 | btrfs_release_path(root, path); | |
1950 | if (em->start > start || em->end < start) { | |
b888db2b | 1951 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end); |
a52d9a80 CM |
1952 | err = -EIO; |
1953 | goto out; | |
1954 | } | |
1955 | ret = add_extent_mapping(em_tree, em); | |
1956 | if (ret == -EEXIST) { | |
1957 | free_extent_map(em); | |
2bf5a725 | 1958 | em = NULL; |
6da6abae CM |
1959 | if (0 && failed_insert == 1) { |
1960 | btrfs_drop_extent_cache(inode, start, end); | |
1961 | } | |
a52d9a80 CM |
1962 | failed_insert++; |
1963 | if (failed_insert > 5) { | |
1964 | printk("failing to insert %Lu %Lu\n", start, end); | |
1965 | err = -EIO; | |
1966 | goto out; | |
1967 | } | |
a52d9a80 CM |
1968 | goto again; |
1969 | } | |
1970 | err = 0; | |
1971 | out: | |
1972 | btrfs_free_path(path); | |
1973 | if (trans) { | |
1974 | ret = btrfs_end_transaction(trans, root); | |
1975 | if (!err) | |
1976 | err = ret; | |
1977 | } | |
1978 | mutex_unlock(&root->fs_info->fs_mutex); | |
1979 | if (err) { | |
1980 | free_extent_map(em); | |
1981 | WARN_ON(1); | |
1982 | return ERR_PTR(err); | |
1983 | } | |
1984 | return em; | |
1985 | } | |
1986 | ||
d396c6f5 | 1987 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 1988 | { |
d396c6f5 | 1989 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
1990 | } |
1991 | ||
a52d9a80 | 1992 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 1993 | { |
a52d9a80 CM |
1994 | struct extent_map_tree *tree; |
1995 | tree = &BTRFS_I(page->mapping->host)->extent_tree; | |
1996 | return extent_read_full_page(tree, page, btrfs_get_extent); | |
9ebefb18 | 1997 | } |
1832a6d5 | 1998 | |
a52d9a80 | 1999 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2000 | { |
a52d9a80 | 2001 | struct extent_map_tree *tree; |
b888db2b CM |
2002 | |
2003 | ||
2004 | if (current->flags & PF_MEMALLOC) { | |
2005 | redirty_page_for_writepage(wbc, page); | |
2006 | unlock_page(page); | |
2007 | return 0; | |
2008 | } | |
a52d9a80 CM |
2009 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
2010 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); | |
9ebefb18 CM |
2011 | } |
2012 | ||
b293f02e CM |
2013 | static int btrfs_writepages(struct address_space *mapping, |
2014 | struct writeback_control *wbc) | |
2015 | { | |
2016 | struct extent_map_tree *tree; | |
2017 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
2018 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); | |
2019 | } | |
2020 | ||
3ab2fb5a CM |
2021 | static int |
2022 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2023 | struct list_head *pages, unsigned nr_pages) | |
2024 | { | |
2025 | struct extent_map_tree *tree; | |
2026 | tree = &BTRFS_I(mapping->host)->extent_tree; | |
2027 | return extent_readpages(tree, mapping, pages, nr_pages, | |
2028 | btrfs_get_extent); | |
2029 | } | |
2030 | ||
a52d9a80 | 2031 | static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags) |
9ebefb18 | 2032 | { |
a52d9a80 CM |
2033 | struct extent_map_tree *tree; |
2034 | int ret; | |
8c2383c3 | 2035 | |
a52d9a80 CM |
2036 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
2037 | ret = try_release_extent_mapping(tree, page); | |
2038 | if (ret == 1) { | |
2039 | ClearPagePrivate(page); | |
2040 | set_page_private(page, 0); | |
2041 | page_cache_release(page); | |
39279cc3 | 2042 | } |
a52d9a80 | 2043 | return ret; |
39279cc3 CM |
2044 | } |
2045 | ||
a52d9a80 | 2046 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2047 | { |
a52d9a80 | 2048 | struct extent_map_tree *tree; |
39279cc3 | 2049 | |
a52d9a80 CM |
2050 | tree = &BTRFS_I(page->mapping->host)->extent_tree; |
2051 | extent_invalidatepage(tree, page, offset); | |
2052 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
2053 | } |
2054 | ||
9ebefb18 CM |
2055 | /* |
2056 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2057 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2058 | * be careful to check for EOF conditions here. We set the page up correctly | |
2059 | * for a written page which means we get ENOSPC checking when writing into | |
2060 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2061 | * support these features. | |
2062 | * | |
2063 | * We are not allowed to take the i_mutex here so we have to play games to | |
2064 | * protect against truncate races as the page could now be beyond EOF. Because | |
2065 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2066 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2067 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2068 | * unlock the page. | |
2069 | */ | |
2070 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2071 | { | |
6da6abae | 2072 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2073 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9ebefb18 CM |
2074 | unsigned long end; |
2075 | loff_t size; | |
1832a6d5 | 2076 | int ret; |
a52d9a80 | 2077 | u64 page_start; |
9ebefb18 | 2078 | |
1832a6d5 CM |
2079 | mutex_lock(&root->fs_info->fs_mutex); |
2080 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); | |
8f662a76 | 2081 | mutex_unlock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2082 | if (ret) |
2083 | goto out; | |
2084 | ||
2085 | ret = -EINVAL; | |
2086 | ||
9ebefb18 CM |
2087 | lock_page(page); |
2088 | wait_on_page_writeback(page); | |
9ebefb18 | 2089 | size = i_size_read(inode); |
35ebb934 | 2090 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 2091 | |
9ebefb18 | 2092 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 2093 | (page_start > size)) { |
9ebefb18 CM |
2094 | /* page got truncated out from underneath us */ |
2095 | goto out_unlock; | |
2096 | } | |
2097 | ||
2098 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2099 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
2100 | end = size & ~PAGE_CACHE_MASK; |
2101 | else | |
2102 | end = PAGE_CACHE_SIZE; | |
2103 | ||
b888db2b | 2104 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
2105 | |
2106 | out_unlock: | |
2107 | unlock_page(page); | |
1832a6d5 | 2108 | out: |
9ebefb18 CM |
2109 | return ret; |
2110 | } | |
2111 | ||
39279cc3 CM |
2112 | static void btrfs_truncate(struct inode *inode) |
2113 | { | |
2114 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2115 | int ret; | |
2116 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2117 | unsigned long nr; |
39279cc3 CM |
2118 | |
2119 | if (!S_ISREG(inode->i_mode)) | |
2120 | return; | |
2121 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2122 | return; | |
2123 | ||
2124 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2125 | ||
2126 | mutex_lock(&root->fs_info->fs_mutex); | |
2127 | trans = btrfs_start_transaction(root, 1); | |
2128 | btrfs_set_trans_block_group(trans, inode); | |
2129 | ||
2130 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
2131 | ret = btrfs_truncate_in_trans(trans, root, inode); | |
39279cc3 | 2132 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2133 | nr = trans->blocks_used; |
5f39d397 | 2134 | |
39279cc3 CM |
2135 | ret = btrfs_end_transaction(trans, root); |
2136 | BUG_ON(ret); | |
2137 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2138 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2139 | btrfs_throttle(root); |
39279cc3 CM |
2140 | } |
2141 | ||
4313b399 CM |
2142 | static int noinline create_subvol(struct btrfs_root *root, char *name, |
2143 | int namelen) | |
39279cc3 CM |
2144 | { |
2145 | struct btrfs_trans_handle *trans; | |
2146 | struct btrfs_key key; | |
2147 | struct btrfs_root_item root_item; | |
2148 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2149 | struct extent_buffer *leaf; |
dc17ff8f | 2150 | struct btrfs_root *new_root = root; |
39279cc3 CM |
2151 | struct inode *inode; |
2152 | struct inode *dir; | |
2153 | int ret; | |
54aa1f4d | 2154 | int err; |
39279cc3 CM |
2155 | u64 objectid; |
2156 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2157 | unsigned long nr = 1; |
39279cc3 CM |
2158 | |
2159 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2160 | ret = btrfs_check_free_space(root, 1, 0); |
2161 | if (ret) | |
2162 | goto fail_commit; | |
2163 | ||
39279cc3 CM |
2164 | trans = btrfs_start_transaction(root, 1); |
2165 | BUG_ON(!trans); | |
2166 | ||
7bb86316 CM |
2167 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2168 | 0, &objectid); | |
2169 | if (ret) | |
2170 | goto fail; | |
2171 | ||
2172 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2173 | objectid, trans->transid, 0, 0, | |
2174 | 0, 0); | |
5f39d397 CM |
2175 | if (IS_ERR(leaf)) |
2176 | return PTR_ERR(leaf); | |
2177 | ||
2178 | btrfs_set_header_nritems(leaf, 0); | |
2179 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2180 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2181 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2182 | btrfs_set_header_owner(leaf, objectid); |
2183 | ||
5f39d397 CM |
2184 | write_extent_buffer(leaf, root->fs_info->fsid, |
2185 | (unsigned long)btrfs_header_fsid(leaf), | |
2186 | BTRFS_FSID_SIZE); | |
2187 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2188 | |
2189 | inode_item = &root_item.inode; | |
2190 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2191 | inode_item->generation = cpu_to_le64(1); |
2192 | inode_item->size = cpu_to_le64(3); | |
2193 | inode_item->nlink = cpu_to_le32(1); | |
2194 | inode_item->nblocks = cpu_to_le64(1); | |
2195 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2196 | |
db94535d CM |
2197 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2198 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2199 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2200 | btrfs_set_root_used(&root_item, 0); |
2201 | ||
5eda7b5e CM |
2202 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2203 | root_item.drop_level = 0; | |
5f39d397 CM |
2204 | |
2205 | free_extent_buffer(leaf); | |
2206 | leaf = NULL; | |
39279cc3 | 2207 | |
39279cc3 CM |
2208 | btrfs_set_root_dirid(&root_item, new_dirid); |
2209 | ||
2210 | key.objectid = objectid; | |
2211 | key.offset = 1; | |
39279cc3 CM |
2212 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2213 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2214 | &root_item); | |
54aa1f4d CM |
2215 | if (ret) |
2216 | goto fail; | |
39279cc3 CM |
2217 | |
2218 | /* | |
2219 | * insert the directory item | |
2220 | */ | |
2221 | key.offset = (u64)-1; | |
2222 | dir = root->fs_info->sb->s_root->d_inode; | |
2223 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2224 | name, namelen, dir->i_ino, &key, | |
2225 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2226 | if (ret) |
2227 | goto fail; | |
39279cc3 | 2228 | |
3954401f CM |
2229 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2230 | name, namelen, objectid, | |
2231 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2232 | if (ret) | |
2233 | goto fail; | |
2234 | ||
39279cc3 | 2235 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2236 | if (ret) |
2237 | goto fail_commit; | |
39279cc3 | 2238 | |
58176a96 | 2239 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2240 | BUG_ON(!new_root); |
2241 | ||
2242 | trans = btrfs_start_transaction(new_root, 1); | |
2243 | BUG_ON(!trans); | |
2244 | ||
2245 | inode = btrfs_new_inode(trans, new_root, new_dirid, | |
2246 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); | |
54aa1f4d CM |
2247 | if (IS_ERR(inode)) |
2248 | goto fail; | |
39279cc3 CM |
2249 | inode->i_op = &btrfs_dir_inode_operations; |
2250 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2251 | new_root->inode = inode; |
39279cc3 | 2252 | |
3954401f CM |
2253 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2254 | new_dirid); | |
39279cc3 | 2255 | inode->i_nlink = 1; |
3954401f | 2256 | inode->i_size = 0; |
39279cc3 | 2257 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2258 | if (ret) |
2259 | goto fail; | |
2260 | fail: | |
d3c2fdcf | 2261 | nr = trans->blocks_used; |
dc17ff8f | 2262 | err = btrfs_commit_transaction(trans, new_root); |
54aa1f4d CM |
2263 | if (err && !ret) |
2264 | ret = err; | |
2265 | fail_commit: | |
39279cc3 | 2266 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2267 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2268 | btrfs_throttle(root); |
54aa1f4d | 2269 | return ret; |
39279cc3 CM |
2270 | } |
2271 | ||
2272 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2273 | { | |
3063d29f | 2274 | struct btrfs_pending_snapshot *pending_snapshot; |
39279cc3 | 2275 | struct btrfs_trans_handle *trans; |
39279cc3 | 2276 | int ret; |
54aa1f4d | 2277 | int err; |
1832a6d5 | 2278 | unsigned long nr = 0; |
39279cc3 CM |
2279 | |
2280 | if (!root->ref_cows) | |
2281 | return -EINVAL; | |
2282 | ||
2283 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2284 | ret = btrfs_check_free_space(root, 1, 0); |
2285 | if (ret) | |
2286 | goto fail_unlock; | |
2287 | ||
3063d29f CM |
2288 | pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS); |
2289 | if (!pending_snapshot) { | |
2290 | ret = -ENOMEM; | |
2291 | goto fail_unlock; | |
2292 | } | |
2293 | pending_snapshot->name = kstrndup(name, namelen, GFP_NOFS); | |
2294 | if (!pending_snapshot->name) { | |
2295 | ret = -ENOMEM; | |
2296 | kfree(pending_snapshot); | |
2297 | goto fail_unlock; | |
2298 | } | |
39279cc3 CM |
2299 | trans = btrfs_start_transaction(root, 1); |
2300 | BUG_ON(!trans); | |
2301 | ||
3063d29f CM |
2302 | pending_snapshot->root = root; |
2303 | list_add(&pending_snapshot->list, | |
2304 | &trans->transaction->pending_snapshots); | |
39279cc3 | 2305 | ret = btrfs_update_inode(trans, root, root->inode); |
54aa1f4d | 2306 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2307 | |
1832a6d5 | 2308 | fail_unlock: |
39279cc3 | 2309 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2310 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2311 | btrfs_throttle(root); |
54aa1f4d | 2312 | return ret; |
39279cc3 CM |
2313 | } |
2314 | ||
edbd8d4e | 2315 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
2316 | struct file_ra_state *ra, struct file *file, |
2317 | pgoff_t offset, pgoff_t last_index) | |
2318 | { | |
2319 | pgoff_t req_size; | |
2320 | ||
2321 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2322 | req_size = last_index - offset + 1; | |
2323 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2324 | return offset; | |
2325 | #else | |
2326 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2327 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2328 | return offset + req_size; | |
2329 | #endif | |
2330 | } | |
2331 | ||
2332 | int btrfs_defrag_file(struct file *file) { | |
6da6abae | 2333 | struct inode *inode = fdentry(file)->d_inode; |
1832a6d5 | 2334 | struct btrfs_root *root = BTRFS_I(inode)->root; |
86479a04 CM |
2335 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
2336 | struct page *page; | |
2337 | unsigned long last_index; | |
2338 | unsigned long ra_index = 0; | |
2339 | u64 page_start; | |
2340 | u64 page_end; | |
edbd8d4e CM |
2341 | u64 delalloc_start; |
2342 | u64 existing_delalloc; | |
86479a04 | 2343 | unsigned long i; |
1832a6d5 CM |
2344 | int ret; |
2345 | ||
2346 | mutex_lock(&root->fs_info->fs_mutex); | |
2347 | ret = btrfs_check_free_space(root, inode->i_size, 0); | |
2348 | mutex_unlock(&root->fs_info->fs_mutex); | |
2349 | if (ret) | |
2350 | return -ENOSPC; | |
86479a04 CM |
2351 | |
2352 | mutex_lock(&inode->i_mutex); | |
2353 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2354 | for (i = 0; i <= last_index; i++) { | |
2355 | if (i == ra_index) { | |
edbd8d4e CM |
2356 | ra_index = btrfs_force_ra(inode->i_mapping, |
2357 | &file->f_ra, | |
2358 | file, ra_index, last_index); | |
86479a04 CM |
2359 | } |
2360 | page = grab_cache_page(inode->i_mapping, i); | |
2361 | if (!page) | |
2362 | goto out_unlock; | |
2363 | if (!PageUptodate(page)) { | |
2364 | btrfs_readpage(NULL, page); | |
2365 | lock_page(page); | |
2366 | if (!PageUptodate(page)) { | |
2367 | unlock_page(page); | |
2368 | page_cache_release(page); | |
2369 | goto out_unlock; | |
2370 | } | |
2371 | } | |
35ebb934 | 2372 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2373 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2374 | ||
2375 | lock_extent(em_tree, page_start, page_end, GFP_NOFS); | |
edbd8d4e CM |
2376 | delalloc_start = page_start; |
2377 | existing_delalloc = | |
2378 | count_range_bits(&BTRFS_I(inode)->extent_tree, | |
2379 | &delalloc_start, page_end, | |
2380 | PAGE_CACHE_SIZE, EXTENT_DELALLOC); | |
86479a04 CM |
2381 | set_extent_delalloc(em_tree, page_start, |
2382 | page_end, GFP_NOFS); | |
edbd8d4e CM |
2383 | |
2384 | spin_lock(&root->fs_info->delalloc_lock); | |
2385 | root->fs_info->delalloc_bytes += PAGE_CACHE_SIZE - | |
2386 | existing_delalloc; | |
2387 | spin_unlock(&root->fs_info->delalloc_lock); | |
2388 | ||
86479a04 CM |
2389 | unlock_extent(em_tree, page_start, page_end, GFP_NOFS); |
2390 | set_page_dirty(page); | |
2391 | unlock_page(page); | |
2392 | page_cache_release(page); | |
2393 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2394 | } | |
2395 | ||
2396 | out_unlock: | |
2397 | mutex_unlock(&inode->i_mutex); | |
2398 | return 0; | |
2399 | } | |
2400 | ||
edbd8d4e CM |
2401 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) |
2402 | { | |
2403 | u64 new_size; | |
2404 | u64 old_size; | |
2405 | struct btrfs_ioctl_vol_args *vol_args; | |
2406 | struct btrfs_trans_handle *trans; | |
2407 | char *sizestr; | |
2408 | int ret = 0; | |
2409 | int namelen; | |
2410 | int mod = 0; | |
2411 | ||
2412 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
2413 | ||
2414 | if (!vol_args) | |
2415 | return -ENOMEM; | |
2416 | ||
2417 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2418 | ret = -EFAULT; | |
2419 | goto out; | |
2420 | } | |
2421 | namelen = strlen(vol_args->name); | |
2422 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2423 | ret = -EINVAL; | |
2424 | goto out; | |
2425 | } | |
2426 | ||
2427 | sizestr = vol_args->name; | |
2428 | if (!strcmp(sizestr, "max")) | |
2429 | new_size = root->fs_info->sb->s_bdev->bd_inode->i_size; | |
2430 | else { | |
2431 | if (sizestr[0] == '-') { | |
2432 | mod = -1; | |
2433 | sizestr++; | |
2434 | } else if (sizestr[0] == '+') { | |
2435 | mod = 1; | |
2436 | sizestr++; | |
2437 | } | |
2438 | new_size = btrfs_parse_size(sizestr); | |
2439 | if (new_size == 0) { | |
2440 | ret = -EINVAL; | |
2441 | goto out; | |
2442 | } | |
2443 | } | |
2444 | ||
2445 | mutex_lock(&root->fs_info->fs_mutex); | |
2446 | old_size = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
2447 | ||
2448 | if (mod < 0) { | |
2449 | if (new_size > old_size) { | |
2450 | ret = -EINVAL; | |
2451 | goto out_unlock; | |
2452 | } | |
2453 | new_size = old_size - new_size; | |
2454 | } else if (mod > 0) { | |
2455 | new_size = old_size + new_size; | |
2456 | } | |
2457 | ||
2458 | if (new_size < 256 * 1024 * 1024) { | |
2459 | ret = -EINVAL; | |
2460 | goto out_unlock; | |
2461 | } | |
2462 | if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) { | |
2463 | ret = -EFBIG; | |
2464 | goto out_unlock; | |
2465 | } | |
f9ef6604 CM |
2466 | |
2467 | do_div(new_size, root->sectorsize); | |
2468 | new_size *= root->sectorsize; | |
edbd8d4e CM |
2469 | |
2470 | printk("new size is %Lu\n", new_size); | |
2471 | if (new_size > old_size) { | |
2472 | trans = btrfs_start_transaction(root, 1); | |
2473 | ret = btrfs_grow_extent_tree(trans, root, new_size); | |
2474 | btrfs_commit_transaction(trans, root); | |
2475 | } else { | |
2476 | ret = btrfs_shrink_extent_tree(root, new_size); | |
2477 | } | |
2478 | ||
2479 | out_unlock: | |
2480 | mutex_unlock(&root->fs_info->fs_mutex); | |
2481 | out: | |
2482 | kfree(vol_args); | |
2483 | return ret; | |
2484 | } | |
2485 | ||
4313b399 CM |
2486 | static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root, |
2487 | void __user *arg) | |
39279cc3 | 2488 | { |
4aec2b52 | 2489 | struct btrfs_ioctl_vol_args *vol_args; |
39279cc3 | 2490 | struct btrfs_dir_item *di; |
39279cc3 CM |
2491 | struct btrfs_path *path; |
2492 | u64 root_dirid; | |
4aec2b52 CM |
2493 | int namelen; |
2494 | int ret; | |
39279cc3 | 2495 | |
4aec2b52 | 2496 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
5f39d397 | 2497 | |
4aec2b52 CM |
2498 | if (!vol_args) |
2499 | return -ENOMEM; | |
2500 | ||
2501 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2502 | ret = -EFAULT; | |
2503 | goto out; | |
2504 | } | |
2505 | ||
2506 | namelen = strlen(vol_args->name); | |
2507 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2508 | ret = -EINVAL; | |
2509 | goto out; | |
2510 | } | |
2511 | if (strchr(vol_args->name, '/')) { | |
2512 | ret = -EINVAL; | |
2513 | goto out; | |
2514 | } | |
d03581f4 CH |
2515 | |
2516 | path = btrfs_alloc_path(); | |
4aec2b52 CM |
2517 | if (!path) { |
2518 | ret = -ENOMEM; | |
2519 | goto out; | |
2520 | } | |
d03581f4 CH |
2521 | |
2522 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2523 | mutex_lock(&root->fs_info->fs_mutex); | |
2524 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2525 | path, root_dirid, | |
4aec2b52 | 2526 | vol_args->name, namelen, 0); |
d03581f4 CH |
2527 | mutex_unlock(&root->fs_info->fs_mutex); |
2528 | btrfs_free_path(path); | |
4aec2b52 CM |
2529 | |
2530 | if (di && !IS_ERR(di)) { | |
2531 | ret = -EEXIST; | |
2532 | goto out; | |
2533 | } | |
2534 | ||
2535 | if (IS_ERR(di)) { | |
2536 | ret = PTR_ERR(di); | |
2537 | goto out; | |
2538 | } | |
d03581f4 CH |
2539 | |
2540 | if (root == root->fs_info->tree_root) | |
4aec2b52 CM |
2541 | ret = create_subvol(root, vol_args->name, namelen); |
2542 | else | |
2543 | ret = create_snapshot(root, vol_args->name, namelen); | |
2544 | out: | |
2545 | kfree(vol_args); | |
2546 | return ret; | |
d03581f4 CH |
2547 | } |
2548 | ||
2549 | static int btrfs_ioctl_defrag(struct file *file) | |
2550 | { | |
6da6abae | 2551 | struct inode *inode = fdentry(file)->d_inode; |
d03581f4 CH |
2552 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2553 | ||
2554 | switch (inode->i_mode & S_IFMT) { | |
2555 | case S_IFDIR: | |
39279cc3 | 2556 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2557 | btrfs_defrag_root(root, 0); |
2558 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2559 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2560 | break; |
d03581f4 CH |
2561 | case S_IFREG: |
2562 | btrfs_defrag_file(file); | |
2563 | break; | |
2564 | } | |
2565 | ||
2566 | return 0; | |
2567 | } | |
6702ed49 | 2568 | |
d03581f4 CH |
2569 | long btrfs_ioctl(struct file *file, unsigned int |
2570 | cmd, unsigned long arg) | |
2571 | { | |
6da6abae | 2572 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
d03581f4 CH |
2573 | |
2574 | switch (cmd) { | |
2575 | case BTRFS_IOC_SNAP_CREATE: | |
2576 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2577 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2578 | return btrfs_ioctl_defrag(file); |
edbd8d4e CM |
2579 | case BTRFS_IOC_RESIZE: |
2580 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
39279cc3 | 2581 | } |
d03581f4 CH |
2582 | |
2583 | return -ENOTTY; | |
39279cc3 CM |
2584 | } |
2585 | ||
39279cc3 CM |
2586 | /* |
2587 | * Called inside transaction, so use GFP_NOFS | |
2588 | */ | |
2589 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2590 | { | |
2591 | struct btrfs_inode *ei; | |
2592 | ||
2593 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2594 | if (!ei) | |
2595 | return NULL; | |
15ee9bc7 | 2596 | ei->last_trans = 0; |
dc17ff8f | 2597 | ei->ordered_trans = 0; |
39279cc3 CM |
2598 | return &ei->vfs_inode; |
2599 | } | |
2600 | ||
2601 | void btrfs_destroy_inode(struct inode *inode) | |
2602 | { | |
2603 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2604 | WARN_ON(inode->i_data.nrpages); | |
2605 | ||
2606 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); | |
2607 | } | |
2608 | ||
44ec0b71 CM |
2609 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2610 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2611 | #else | |
39279cc3 CM |
2612 | static void init_once(void * foo, struct kmem_cache * cachep, |
2613 | unsigned long flags) | |
44ec0b71 | 2614 | #endif |
39279cc3 CM |
2615 | { |
2616 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2617 | ||
2618 | inode_init_once(&ei->vfs_inode); | |
2619 | } | |
2620 | ||
2621 | void btrfs_destroy_cachep(void) | |
2622 | { | |
2623 | if (btrfs_inode_cachep) | |
2624 | kmem_cache_destroy(btrfs_inode_cachep); | |
2625 | if (btrfs_trans_handle_cachep) | |
2626 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2627 | if (btrfs_transaction_cachep) | |
2628 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2629 | if (btrfs_bit_radix_cachep) | |
2630 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2631 | if (btrfs_path_cachep) | |
2632 | kmem_cache_destroy(btrfs_path_cachep); | |
2633 | } | |
2634 | ||
86479a04 | 2635 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2636 | unsigned long extra_flags, |
44ec0b71 CM |
2637 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2638 | void (*ctor)(struct kmem_cache *, void *) | |
2639 | #else | |
92fee66d | 2640 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2641 | unsigned long) |
2642 | #endif | |
2643 | ) | |
92fee66d CM |
2644 | { |
2645 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2646 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2647 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2648 | ,NULL | |
2649 | #endif | |
2650 | ); | |
2651 | } | |
2652 | ||
39279cc3 CM |
2653 | int btrfs_init_cachep(void) |
2654 | { | |
86479a04 | 2655 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2656 | sizeof(struct btrfs_inode), |
2657 | 0, init_once); | |
39279cc3 CM |
2658 | if (!btrfs_inode_cachep) |
2659 | goto fail; | |
86479a04 CM |
2660 | btrfs_trans_handle_cachep = |
2661 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2662 | sizeof(struct btrfs_trans_handle), | |
2663 | 0, NULL); | |
39279cc3 CM |
2664 | if (!btrfs_trans_handle_cachep) |
2665 | goto fail; | |
86479a04 | 2666 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2667 | sizeof(struct btrfs_transaction), |
92fee66d | 2668 | 0, NULL); |
39279cc3 CM |
2669 | if (!btrfs_transaction_cachep) |
2670 | goto fail; | |
86479a04 | 2671 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2672 | sizeof(struct btrfs_path), |
92fee66d | 2673 | 0, NULL); |
39279cc3 CM |
2674 | if (!btrfs_path_cachep) |
2675 | goto fail; | |
86479a04 | 2676 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2677 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2678 | if (!btrfs_bit_radix_cachep) |
2679 | goto fail; | |
2680 | return 0; | |
2681 | fail: | |
2682 | btrfs_destroy_cachep(); | |
2683 | return -ENOMEM; | |
2684 | } | |
2685 | ||
2686 | static int btrfs_getattr(struct vfsmount *mnt, | |
2687 | struct dentry *dentry, struct kstat *stat) | |
2688 | { | |
2689 | struct inode *inode = dentry->d_inode; | |
2690 | generic_fillattr(inode, stat); | |
d6667462 | 2691 | stat->blksize = PAGE_CACHE_SIZE; |
39279cc3 CM |
2692 | return 0; |
2693 | } | |
2694 | ||
2695 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2696 | struct inode * new_dir,struct dentry *new_dentry) | |
2697 | { | |
2698 | struct btrfs_trans_handle *trans; | |
2699 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2700 | struct inode *new_inode = new_dentry->d_inode; | |
2701 | struct inode *old_inode = old_dentry->d_inode; | |
2702 | struct timespec ctime = CURRENT_TIME; | |
2703 | struct btrfs_path *path; | |
39279cc3 CM |
2704 | int ret; |
2705 | ||
2706 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2707 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2708 | return -ENOTEMPTY; | |
2709 | } | |
5f39d397 | 2710 | |
39279cc3 | 2711 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2712 | ret = btrfs_check_free_space(root, 1, 0); |
2713 | if (ret) | |
2714 | goto out_unlock; | |
2715 | ||
39279cc3 | 2716 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2717 | |
39279cc3 CM |
2718 | btrfs_set_trans_block_group(trans, new_dir); |
2719 | path = btrfs_alloc_path(); | |
2720 | if (!path) { | |
2721 | ret = -ENOMEM; | |
2722 | goto out_fail; | |
2723 | } | |
2724 | ||
2725 | old_dentry->d_inode->i_nlink++; | |
2726 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2727 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2728 | old_inode->i_ctime = ctime; | |
5f39d397 | 2729 | |
39279cc3 CM |
2730 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2731 | if (ret) | |
2732 | goto out_fail; | |
2733 | ||
2734 | if (new_inode) { | |
2735 | new_inode->i_ctime = CURRENT_TIME; | |
2736 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2737 | if (ret) | |
2738 | goto out_fail; | |
39279cc3 CM |
2739 | } |
2740 | ret = btrfs_add_link(trans, new_dentry, old_inode); | |
2741 | if (ret) | |
2742 | goto out_fail; | |
2743 | ||
2744 | out_fail: | |
2745 | btrfs_free_path(path); | |
2746 | btrfs_end_transaction(trans, root); | |
1832a6d5 | 2747 | out_unlock: |
39279cc3 CM |
2748 | mutex_unlock(&root->fs_info->fs_mutex); |
2749 | return ret; | |
2750 | } | |
2751 | ||
2752 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2753 | const char *symname) | |
2754 | { | |
2755 | struct btrfs_trans_handle *trans; | |
2756 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2757 | struct btrfs_path *path; | |
2758 | struct btrfs_key key; | |
1832a6d5 | 2759 | struct inode *inode = NULL; |
39279cc3 CM |
2760 | int err; |
2761 | int drop_inode = 0; | |
2762 | u64 objectid; | |
2763 | int name_len; | |
2764 | int datasize; | |
5f39d397 | 2765 | unsigned long ptr; |
39279cc3 | 2766 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2767 | struct extent_buffer *leaf; |
1832a6d5 | 2768 | unsigned long nr = 0; |
39279cc3 CM |
2769 | |
2770 | name_len = strlen(symname) + 1; | |
2771 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2772 | return -ENAMETOOLONG; | |
1832a6d5 | 2773 | |
39279cc3 | 2774 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2775 | err = btrfs_check_free_space(root, 1, 0); |
2776 | if (err) | |
2777 | goto out_fail; | |
2778 | ||
39279cc3 CM |
2779 | trans = btrfs_start_transaction(root, 1); |
2780 | btrfs_set_trans_block_group(trans, dir); | |
2781 | ||
2782 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2783 | if (err) { | |
2784 | err = -ENOSPC; | |
2785 | goto out_unlock; | |
2786 | } | |
2787 | ||
2788 | inode = btrfs_new_inode(trans, root, objectid, | |
2789 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); | |
2790 | err = PTR_ERR(inode); | |
2791 | if (IS_ERR(inode)) | |
2792 | goto out_unlock; | |
2793 | ||
2794 | btrfs_set_trans_block_group(trans, inode); | |
2795 | err = btrfs_add_nondir(trans, dentry, inode); | |
2796 | if (err) | |
2797 | drop_inode = 1; | |
2798 | else { | |
2799 | inode->i_mapping->a_ops = &btrfs_aops; | |
2800 | inode->i_fop = &btrfs_file_operations; | |
2801 | inode->i_op = &btrfs_file_inode_operations; | |
a52d9a80 CM |
2802 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, |
2803 | inode->i_mapping, GFP_NOFS); | |
07157aac | 2804 | BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops; |
39279cc3 CM |
2805 | } |
2806 | dir->i_sb->s_dirt = 1; | |
2807 | btrfs_update_inode_block_group(trans, inode); | |
2808 | btrfs_update_inode_block_group(trans, dir); | |
2809 | if (drop_inode) | |
2810 | goto out_unlock; | |
2811 | ||
2812 | path = btrfs_alloc_path(); | |
2813 | BUG_ON(!path); | |
2814 | key.objectid = inode->i_ino; | |
2815 | key.offset = 0; | |
39279cc3 CM |
2816 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2817 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2818 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2819 | datasize); | |
54aa1f4d CM |
2820 | if (err) { |
2821 | drop_inode = 1; | |
2822 | goto out_unlock; | |
2823 | } | |
5f39d397 CM |
2824 | leaf = path->nodes[0]; |
2825 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2826 | struct btrfs_file_extent_item); | |
2827 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2828 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2829 | BTRFS_FILE_EXTENT_INLINE); |
2830 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2831 | write_extent_buffer(leaf, symname, ptr, name_len); |
2832 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2833 | btrfs_free_path(path); |
5f39d397 | 2834 | |
39279cc3 CM |
2835 | inode->i_op = &btrfs_symlink_inode_operations; |
2836 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2837 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2838 | err = btrfs_update_inode(trans, root, inode); |
2839 | if (err) | |
2840 | drop_inode = 1; | |
39279cc3 CM |
2841 | |
2842 | out_unlock: | |
d3c2fdcf | 2843 | nr = trans->blocks_used; |
39279cc3 | 2844 | btrfs_end_transaction(trans, root); |
1832a6d5 | 2845 | out_fail: |
39279cc3 | 2846 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 CM |
2847 | if (drop_inode) { |
2848 | inode_dec_link_count(inode); | |
2849 | iput(inode); | |
2850 | } | |
d3c2fdcf | 2851 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2852 | btrfs_throttle(root); |
39279cc3 CM |
2853 | return err; |
2854 | } | |
2855 | ||
2856 | static struct inode_operations btrfs_dir_inode_operations = { | |
2857 | .lookup = btrfs_lookup, | |
2858 | .create = btrfs_create, | |
2859 | .unlink = btrfs_unlink, | |
2860 | .link = btrfs_link, | |
2861 | .mkdir = btrfs_mkdir, | |
2862 | .rmdir = btrfs_rmdir, | |
2863 | .rename = btrfs_rename, | |
2864 | .symlink = btrfs_symlink, | |
2865 | .setattr = btrfs_setattr, | |
618e21d5 | 2866 | .mknod = btrfs_mknod, |
5103e947 JB |
2867 | .setxattr = generic_setxattr, |
2868 | .getxattr = generic_getxattr, | |
2869 | .listxattr = btrfs_listxattr, | |
2870 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2871 | }; |
2872 | ||
2873 | static struct inode_operations btrfs_dir_ro_inode_operations = { | |
2874 | .lookup = btrfs_lookup, | |
2875 | }; | |
2876 | ||
2877 | static struct file_operations btrfs_dir_file_operations = { | |
2878 | .llseek = generic_file_llseek, | |
2879 | .read = generic_read_dir, | |
2880 | .readdir = btrfs_readdir, | |
34287aa3 | 2881 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2882 | #ifdef CONFIG_COMPAT |
34287aa3 | 2883 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2884 | #endif |
2885 | }; | |
2886 | ||
07157aac CM |
2887 | static struct extent_map_ops btrfs_extent_map_ops = { |
2888 | .fill_delalloc = run_delalloc_range, | |
2889 | .writepage_io_hook = btrfs_writepage_io_hook, | |
2890 | .readpage_io_hook = btrfs_readpage_io_hook, | |
2891 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
2892 | }; | |
2893 | ||
39279cc3 CM |
2894 | static struct address_space_operations btrfs_aops = { |
2895 | .readpage = btrfs_readpage, | |
2896 | .writepage = btrfs_writepage, | |
b293f02e | 2897 | .writepages = btrfs_writepages, |
3ab2fb5a | 2898 | .readpages = btrfs_readpages, |
39279cc3 | 2899 | .sync_page = block_sync_page, |
39279cc3 | 2900 | .bmap = btrfs_bmap, |
a52d9a80 CM |
2901 | .invalidatepage = btrfs_invalidatepage, |
2902 | .releasepage = btrfs_releasepage, | |
2903 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
2904 | }; |
2905 | ||
2906 | static struct address_space_operations btrfs_symlink_aops = { | |
2907 | .readpage = btrfs_readpage, | |
2908 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
2909 | .invalidatepage = btrfs_invalidatepage, |
2910 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
2911 | }; |
2912 | ||
2913 | static struct inode_operations btrfs_file_inode_operations = { | |
2914 | .truncate = btrfs_truncate, | |
2915 | .getattr = btrfs_getattr, | |
2916 | .setattr = btrfs_setattr, | |
5103e947 JB |
2917 | .setxattr = generic_setxattr, |
2918 | .getxattr = generic_getxattr, | |
2919 | .listxattr = btrfs_listxattr, | |
2920 | .removexattr = generic_removexattr, | |
39279cc3 CM |
2921 | }; |
2922 | ||
618e21d5 JB |
2923 | static struct inode_operations btrfs_special_inode_operations = { |
2924 | .getattr = btrfs_getattr, | |
2925 | .setattr = btrfs_setattr, | |
2926 | }; | |
2927 | ||
39279cc3 CM |
2928 | static struct inode_operations btrfs_symlink_inode_operations = { |
2929 | .readlink = generic_readlink, | |
2930 | .follow_link = page_follow_link_light, | |
2931 | .put_link = page_put_link, | |
2932 | }; |