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 | ||
065631f6 | 19 | #include <linux/bio.h> |
39279cc3 CM |
20 | #include <linux/buffer_head.h> |
21 | #include <linux/fs.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/highmem.h> | |
24 | #include <linux/time.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/smp_lock.h> | |
28 | #include <linux/backing-dev.h> | |
29 | #include <linux/mpage.h> | |
30 | #include <linux/swap.h> | |
31 | #include <linux/writeback.h> | |
32 | #include <linux/statfs.h> | |
33 | #include <linux/compat.h> | |
9ebefb18 | 34 | #include <linux/bit_spinlock.h> |
92fee66d | 35 | #include <linux/version.h> |
5103e947 | 36 | #include <linux/xattr.h> |
39279cc3 CM |
37 | #include "ctree.h" |
38 | #include "disk-io.h" | |
39 | #include "transaction.h" | |
40 | #include "btrfs_inode.h" | |
41 | #include "ioctl.h" | |
42 | #include "print-tree.h" | |
0b86a832 | 43 | #include "volumes.h" |
39279cc3 CM |
44 | |
45 | struct btrfs_iget_args { | |
46 | u64 ino; | |
47 | struct btrfs_root *root; | |
48 | }; | |
49 | ||
50 | static struct inode_operations btrfs_dir_inode_operations; | |
51 | static struct inode_operations btrfs_symlink_inode_operations; | |
52 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 53 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
54 | static struct inode_operations btrfs_file_inode_operations; |
55 | static struct address_space_operations btrfs_aops; | |
56 | static struct address_space_operations btrfs_symlink_aops; | |
57 | static struct file_operations btrfs_dir_file_operations; | |
d1310b2e | 58 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
59 | |
60 | static struct kmem_cache *btrfs_inode_cachep; | |
61 | struct kmem_cache *btrfs_trans_handle_cachep; | |
62 | struct kmem_cache *btrfs_transaction_cachep; | |
63 | struct kmem_cache *btrfs_bit_radix_cachep; | |
64 | struct kmem_cache *btrfs_path_cachep; | |
65 | ||
66 | #define S_SHIFT 12 | |
67 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
68 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
69 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
70 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
71 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
72 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
73 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
74 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
75 | }; | |
76 | ||
1832a6d5 CM |
77 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
78 | int for_del) | |
79 | { | |
80 | u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
81 | u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
82 | u64 thresh; | |
83 | int ret = 0; | |
84 | ||
85 | if (for_del) | |
f9ef6604 | 86 | thresh = total * 90; |
1832a6d5 | 87 | else |
f9ef6604 CM |
88 | thresh = total * 85; |
89 | ||
90 | do_div(thresh, 100); | |
1832a6d5 CM |
91 | |
92 | spin_lock(&root->fs_info->delalloc_lock); | |
93 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) | |
94 | ret = -ENOSPC; | |
95 | spin_unlock(&root->fs_info->delalloc_lock); | |
96 | return ret; | |
97 | } | |
98 | ||
be20aa9d | 99 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
100 | { |
101 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
102 | struct btrfs_trans_handle *trans; | |
b888db2b | 103 | u64 alloc_hint = 0; |
db94535d | 104 | u64 num_bytes; |
c59f8951 | 105 | u64 cur_alloc_size; |
db94535d | 106 | u64 blocksize = root->sectorsize; |
d1310b2e CM |
107 | u64 orig_start = start; |
108 | u64 orig_num_bytes; | |
be20aa9d CM |
109 | struct btrfs_key ins; |
110 | int ret; | |
b888db2b | 111 | |
b888db2b | 112 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 113 | BUG_ON(!trans); |
be20aa9d CM |
114 | btrfs_set_trans_block_group(trans, inode); |
115 | ||
db94535d | 116 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 117 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 118 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 119 | start, start + num_bytes, start, &alloc_hint); |
d1310b2e | 120 | orig_num_bytes = num_bytes; |
db94535d | 121 | |
179e29e4 CM |
122 | if (alloc_hint == EXTENT_MAP_INLINE) |
123 | goto out; | |
124 | ||
3b951516 CM |
125 | BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy)); |
126 | ||
c59f8951 CM |
127 | while(num_bytes > 0) { |
128 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
129 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
98d20f67 | 130 | root->sectorsize, |
c59f8951 CM |
131 | root->root_key.objectid, |
132 | trans->transid, | |
133 | inode->i_ino, start, 0, | |
134 | alloc_hint, (u64)-1, &ins, 1); | |
135 | if (ret) { | |
136 | WARN_ON(1); | |
137 | goto out; | |
138 | } | |
98d20f67 | 139 | cur_alloc_size = ins.offset; |
c59f8951 CM |
140 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, |
141 | start, ins.objectid, ins.offset, | |
142 | ins.offset); | |
9069218d | 143 | inode->i_blocks += ins.offset >> 9; |
5f56406a | 144 | btrfs_check_file(root, inode); |
3b951516 CM |
145 | if (num_bytes < cur_alloc_size) { |
146 | printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes, | |
147 | cur_alloc_size); | |
148 | break; | |
149 | } | |
c59f8951 CM |
150 | num_bytes -= cur_alloc_size; |
151 | alloc_hint = ins.objectid + ins.offset; | |
152 | start += cur_alloc_size; | |
b888db2b | 153 | } |
d1310b2e CM |
154 | btrfs_drop_extent_cache(inode, orig_start, |
155 | orig_start + orig_num_bytes - 1); | |
dc17ff8f | 156 | btrfs_add_ordered_inode(inode); |
9069218d | 157 | btrfs_update_inode(trans, root, inode); |
b888db2b CM |
158 | out: |
159 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
160 | return ret; |
161 | } | |
162 | ||
163 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
164 | { | |
165 | u64 extent_start; | |
166 | u64 extent_end; | |
167 | u64 bytenr; | |
168 | u64 cow_end; | |
1832a6d5 | 169 | u64 loops = 0; |
c31f8830 | 170 | u64 total_fs_bytes; |
be20aa9d CM |
171 | struct btrfs_root *root = BTRFS_I(inode)->root; |
172 | struct extent_buffer *leaf; | |
173 | int found_type; | |
174 | struct btrfs_path *path; | |
175 | struct btrfs_file_extent_item *item; | |
176 | int ret; | |
177 | int err; | |
178 | struct btrfs_key found_key; | |
179 | ||
c31f8830 | 180 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
181 | path = btrfs_alloc_path(); |
182 | BUG_ON(!path); | |
183 | again: | |
184 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
185 | inode->i_ino, start, 0); | |
186 | if (ret < 0) { | |
187 | btrfs_free_path(path); | |
188 | return ret; | |
189 | } | |
190 | ||
191 | cow_end = end; | |
192 | if (ret != 0) { | |
193 | if (path->slots[0] == 0) | |
194 | goto not_found; | |
195 | path->slots[0]--; | |
196 | } | |
197 | ||
198 | leaf = path->nodes[0]; | |
199 | item = btrfs_item_ptr(leaf, path->slots[0], | |
200 | struct btrfs_file_extent_item); | |
201 | ||
202 | /* are we inside the extent that was found? */ | |
203 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
204 | found_type = btrfs_key_type(&found_key); | |
205 | if (found_key.objectid != inode->i_ino || | |
206 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
207 | goto not_found; | |
208 | } | |
209 | ||
210 | found_type = btrfs_file_extent_type(leaf, item); | |
211 | extent_start = found_key.offset; | |
212 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
213 | u64 extent_num_bytes; |
214 | ||
215 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
216 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
217 | err = 0; |
218 | ||
1832a6d5 CM |
219 | if (loops && start != extent_start) |
220 | goto not_found; | |
221 | ||
be20aa9d CM |
222 | if (start < extent_start || start >= extent_end) |
223 | goto not_found; | |
224 | ||
225 | cow_end = min(end, extent_end - 1); | |
226 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
227 | if (bytenr == 0) | |
228 | goto not_found; | |
229 | ||
c31f8830 CM |
230 | /* |
231 | * we may be called by the resizer, make sure we're inside | |
232 | * the limits of the FS | |
233 | */ | |
234 | if (bytenr + extent_num_bytes > total_fs_bytes) | |
235 | goto not_found; | |
236 | ||
be20aa9d CM |
237 | if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) { |
238 | goto not_found; | |
239 | } | |
240 | ||
241 | start = extent_end; | |
bd09835d | 242 | } else { |
be20aa9d CM |
243 | goto not_found; |
244 | } | |
245 | loop: | |
246 | if (start > end) { | |
247 | btrfs_free_path(path); | |
248 | return 0; | |
249 | } | |
250 | btrfs_release_path(root, path); | |
1832a6d5 | 251 | loops++; |
be20aa9d CM |
252 | goto again; |
253 | ||
254 | not_found: | |
255 | cow_file_range(inode, start, cow_end); | |
256 | start = cow_end + 1; | |
257 | goto loop; | |
258 | } | |
259 | ||
260 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
261 | { | |
262 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
263 | int ret; | |
be20aa9d | 264 | mutex_lock(&root->fs_info->fs_mutex); |
b98b6767 Y |
265 | if (btrfs_test_opt(root, NODATACOW) || |
266 | btrfs_test_flag(inode, NODATACOW)) | |
be20aa9d CM |
267 | ret = run_delalloc_nocow(inode, start, end); |
268 | else | |
269 | ret = cow_file_range(inode, start, end); | |
1832a6d5 | 270 | |
b888db2b CM |
271 | mutex_unlock(&root->fs_info->fs_mutex); |
272 | return ret; | |
273 | } | |
274 | ||
291d673e | 275 | int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, |
b0c68f8b | 276 | unsigned long old, unsigned long bits) |
291d673e | 277 | { |
b0c68f8b | 278 | if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e CM |
279 | struct btrfs_root *root = BTRFS_I(inode)->root; |
280 | spin_lock(&root->fs_info->delalloc_lock); | |
9069218d | 281 | BTRFS_I(inode)->delalloc_bytes += end - start + 1; |
291d673e CM |
282 | root->fs_info->delalloc_bytes += end - start + 1; |
283 | spin_unlock(&root->fs_info->delalloc_lock); | |
284 | } | |
285 | return 0; | |
286 | } | |
287 | ||
288 | int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, | |
b0c68f8b | 289 | unsigned long old, unsigned long bits) |
291d673e | 290 | { |
b0c68f8b | 291 | if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e CM |
292 | struct btrfs_root *root = BTRFS_I(inode)->root; |
293 | spin_lock(&root->fs_info->delalloc_lock); | |
b0c68f8b CM |
294 | if (end - start + 1 > root->fs_info->delalloc_bytes) { |
295 | printk("warning: delalloc account %Lu %Lu\n", | |
296 | end - start + 1, root->fs_info->delalloc_bytes); | |
297 | root->fs_info->delalloc_bytes = 0; | |
9069218d | 298 | BTRFS_I(inode)->delalloc_bytes = 0; |
b0c68f8b CM |
299 | } else { |
300 | root->fs_info->delalloc_bytes -= end - start + 1; | |
9069218d | 301 | BTRFS_I(inode)->delalloc_bytes -= end - start + 1; |
b0c68f8b | 302 | } |
291d673e CM |
303 | spin_unlock(&root->fs_info->delalloc_lock); |
304 | } | |
305 | return 0; | |
306 | } | |
307 | ||
239b14b3 CM |
308 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
309 | size_t size, struct bio *bio) | |
310 | { | |
311 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
312 | struct btrfs_mapping_tree *map_tree; | |
239b14b3 | 313 | u64 logical = bio->bi_sector << 9; |
239b14b3 CM |
314 | u64 length = 0; |
315 | u64 map_length; | |
239b14b3 CM |
316 | int ret; |
317 | ||
f2d8d74d | 318 | length = bio->bi_size; |
239b14b3 CM |
319 | map_tree = &root->fs_info->mapping_tree; |
320 | map_length = length; | |
cea9e445 | 321 | ret = btrfs_map_block(map_tree, READ, logical, |
f188591e | 322 | &map_length, NULL, 0); |
cea9e445 | 323 | |
239b14b3 | 324 | if (map_length < length + size) { |
239b14b3 CM |
325 | return 1; |
326 | } | |
327 | return 0; | |
328 | } | |
329 | ||
44b8bd7e | 330 | int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
f188591e | 331 | int mirror_num) |
065631f6 | 332 | { |
065631f6 CM |
333 | struct btrfs_root *root = BTRFS_I(inode)->root; |
334 | struct btrfs_trans_handle *trans; | |
335 | int ret = 0; | |
e015640f CM |
336 | char *sums = NULL; |
337 | ||
338 | ret = btrfs_csum_one_bio(root, bio, &sums); | |
339 | BUG_ON(ret); | |
065631f6 | 340 | |
44b8bd7e CM |
341 | mutex_lock(&root->fs_info->fs_mutex); |
342 | trans = btrfs_start_transaction(root, 1); | |
e015640f | 343 | |
44b8bd7e | 344 | btrfs_set_trans_block_group(trans, inode); |
e015640f CM |
345 | btrfs_csum_file_blocks(trans, root, inode, bio, sums); |
346 | ||
44b8bd7e CM |
347 | ret = btrfs_end_transaction(trans, root); |
348 | BUG_ON(ret); | |
349 | mutex_unlock(&root->fs_info->fs_mutex); | |
e015640f CM |
350 | |
351 | kfree(sums); | |
352 | ||
44b8bd7e CM |
353 | return btrfs_map_bio(root, rw, bio, mirror_num); |
354 | } | |
355 | ||
356 | int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, | |
357 | int mirror_num) | |
358 | { | |
359 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
360 | int ret = 0; | |
361 | ||
22c59948 CM |
362 | if (!(rw & (1 << BIO_RW))) { |
363 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); | |
364 | BUG_ON(ret); | |
0b86a832 CM |
365 | goto mapit; |
366 | } | |
065631f6 CM |
367 | |
368 | if (btrfs_test_opt(root, NODATASUM) || | |
0b86a832 CM |
369 | btrfs_test_flag(inode, NODATASUM)) { |
370 | goto mapit; | |
371 | } | |
065631f6 | 372 | |
44b8bd7e CM |
373 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
374 | inode, rw, bio, mirror_num, | |
375 | __btrfs_submit_bio_hook); | |
0b86a832 | 376 | mapit: |
f188591e | 377 | return btrfs_map_bio(root, rw, bio, mirror_num); |
065631f6 | 378 | } |
6885f308 | 379 | |
07157aac CM |
380 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) |
381 | { | |
382 | int ret = 0; | |
383 | struct inode *inode = page->mapping->host; | |
384 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 385 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac CM |
386 | struct btrfs_csum_item *item; |
387 | struct btrfs_path *path = NULL; | |
ff79f819 | 388 | u32 csum; |
699122f5 | 389 | |
b98b6767 Y |
390 | if (btrfs_test_opt(root, NODATASUM) || |
391 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 392 | return 0; |
699122f5 | 393 | |
07157aac CM |
394 | mutex_lock(&root->fs_info->fs_mutex); |
395 | path = btrfs_alloc_path(); | |
396 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
397 | if (IS_ERR(item)) { | |
398 | ret = PTR_ERR(item); | |
399 | /* a csum that isn't present is a preallocated region. */ | |
400 | if (ret == -ENOENT || ret == -EFBIG) | |
401 | ret = 0; | |
ff79f819 | 402 | csum = 0; |
aadfeb6e | 403 | printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start); |
07157aac CM |
404 | goto out; |
405 | } | |
ff79f819 CM |
406 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
407 | BTRFS_CRC32_SIZE); | |
d1310b2e | 408 | set_state_private(io_tree, start, csum); |
07157aac CM |
409 | out: |
410 | if (path) | |
411 | btrfs_free_path(path); | |
412 | mutex_unlock(&root->fs_info->fs_mutex); | |
413 | return ret; | |
414 | } | |
415 | ||
7e38326f CM |
416 | struct io_failure_record { |
417 | struct page *page; | |
418 | u64 start; | |
419 | u64 len; | |
420 | u64 logical; | |
421 | int last_mirror; | |
422 | }; | |
423 | ||
424 | int btrfs_readpage_io_failed_hook(struct bio *failed_bio, | |
425 | struct page *page, u64 start, u64 end, | |
426 | struct extent_state *state) | |
427 | { | |
428 | struct io_failure_record *failrec = NULL; | |
429 | u64 private; | |
430 | struct extent_map *em; | |
431 | struct inode *inode = page->mapping->host; | |
432 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
3b951516 | 433 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
7e38326f CM |
434 | struct bio *bio; |
435 | int num_copies; | |
436 | int ret; | |
437 | u64 logical; | |
438 | ||
439 | ret = get_state_private(failure_tree, start, &private); | |
440 | if (ret) { | |
7e38326f CM |
441 | failrec = kmalloc(sizeof(*failrec), GFP_NOFS); |
442 | if (!failrec) | |
443 | return -ENOMEM; | |
444 | failrec->start = start; | |
445 | failrec->len = end - start + 1; | |
446 | failrec->last_mirror = 0; | |
447 | ||
3b951516 CM |
448 | spin_lock(&em_tree->lock); |
449 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
450 | if (em->start > start || em->start + em->len < start) { | |
451 | free_extent_map(em); | |
452 | em = NULL; | |
453 | } | |
454 | spin_unlock(&em_tree->lock); | |
7e38326f CM |
455 | |
456 | if (!em || IS_ERR(em)) { | |
457 | kfree(failrec); | |
458 | return -EIO; | |
459 | } | |
460 | logical = start - em->start; | |
461 | logical = em->block_start + logical; | |
462 | failrec->logical = logical; | |
463 | free_extent_map(em); | |
464 | set_extent_bits(failure_tree, start, end, EXTENT_LOCKED | | |
465 | EXTENT_DIRTY, GFP_NOFS); | |
587f7704 CM |
466 | set_state_private(failure_tree, start, |
467 | (u64)(unsigned long)failrec); | |
7e38326f | 468 | } else { |
587f7704 | 469 | failrec = (struct io_failure_record *)(unsigned long)private; |
7e38326f CM |
470 | } |
471 | num_copies = btrfs_num_copies( | |
472 | &BTRFS_I(inode)->root->fs_info->mapping_tree, | |
473 | failrec->logical, failrec->len); | |
474 | failrec->last_mirror++; | |
475 | if (!state) { | |
476 | spin_lock_irq(&BTRFS_I(inode)->io_tree.lock); | |
477 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
478 | failrec->start, | |
479 | EXTENT_LOCKED); | |
480 | if (state && state->start != failrec->start) | |
481 | state = NULL; | |
482 | spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock); | |
483 | } | |
484 | if (!state || failrec->last_mirror > num_copies) { | |
485 | set_state_private(failure_tree, failrec->start, 0); | |
486 | clear_extent_bits(failure_tree, failrec->start, | |
487 | failrec->start + failrec->len - 1, | |
488 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
489 | kfree(failrec); | |
490 | return -EIO; | |
491 | } | |
492 | bio = bio_alloc(GFP_NOFS, 1); | |
493 | bio->bi_private = state; | |
494 | bio->bi_end_io = failed_bio->bi_end_io; | |
495 | bio->bi_sector = failrec->logical >> 9; | |
496 | bio->bi_bdev = failed_bio->bi_bdev; | |
497 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); | |
498 | btrfs_submit_bio_hook(inode, READ, bio, failrec->last_mirror); | |
499 | return 0; | |
500 | } | |
501 | ||
70dec807 CM |
502 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
503 | struct extent_state *state) | |
07157aac | 504 | { |
35ebb934 | 505 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 506 | struct inode *inode = page->mapping->host; |
d1310b2e | 507 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 508 | char *kaddr; |
aadfeb6e | 509 | u64 private = ~(u32)0; |
07157aac | 510 | int ret; |
ff79f819 CM |
511 | struct btrfs_root *root = BTRFS_I(inode)->root; |
512 | u32 csum = ~(u32)0; | |
bbf0d006 | 513 | unsigned long flags; |
d1310b2e | 514 | |
b98b6767 Y |
515 | if (btrfs_test_opt(root, NODATASUM) || |
516 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 517 | return 0; |
c2e639f0 | 518 | if (state && state->start == start) { |
70dec807 CM |
519 | private = state->private; |
520 | ret = 0; | |
521 | } else { | |
522 | ret = get_state_private(io_tree, start, &private); | |
523 | } | |
bbf0d006 | 524 | local_irq_save(flags); |
07157aac CM |
525 | kaddr = kmap_atomic(page, KM_IRQ0); |
526 | if (ret) { | |
527 | goto zeroit; | |
528 | } | |
ff79f819 CM |
529 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
530 | btrfs_csum_final(csum, (char *)&csum); | |
531 | if (csum != private) { | |
07157aac CM |
532 | goto zeroit; |
533 | } | |
534 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 535 | local_irq_restore(flags); |
7e38326f CM |
536 | |
537 | /* if the io failure tree for this inode is non-empty, | |
538 | * check to see if we've recovered from a failed IO | |
539 | */ | |
540 | private = 0; | |
541 | if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
542 | (u64)-1, 1, EXTENT_DIRTY)) { | |
543 | u64 private_failure; | |
544 | struct io_failure_record *failure; | |
545 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, | |
546 | start, &private_failure); | |
547 | if (ret == 0) { | |
587f7704 CM |
548 | failure = (struct io_failure_record *)(unsigned long) |
549 | private_failure; | |
7e38326f CM |
550 | set_state_private(&BTRFS_I(inode)->io_failure_tree, |
551 | failure->start, 0); | |
552 | clear_extent_bits(&BTRFS_I(inode)->io_failure_tree, | |
553 | failure->start, | |
554 | failure->start + failure->len - 1, | |
555 | EXTENT_DIRTY | EXTENT_LOCKED, | |
556 | GFP_NOFS); | |
557 | kfree(failure); | |
558 | } | |
559 | } | |
07157aac CM |
560 | return 0; |
561 | ||
562 | zeroit: | |
aadfeb6e CM |
563 | printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n", |
564 | page->mapping->host->i_ino, (unsigned long long)start, csum, | |
565 | private); | |
db94535d CM |
566 | memset(kaddr + offset, 1, end - start + 1); |
567 | flush_dcache_page(page); | |
07157aac | 568 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 569 | local_irq_restore(flags); |
3b951516 CM |
570 | if (private == 0) |
571 | return 0; | |
7e38326f | 572 | return -EIO; |
07157aac | 573 | } |
b888db2b | 574 | |
39279cc3 CM |
575 | void btrfs_read_locked_inode(struct inode *inode) |
576 | { | |
577 | struct btrfs_path *path; | |
5f39d397 | 578 | struct extent_buffer *leaf; |
39279cc3 | 579 | struct btrfs_inode_item *inode_item; |
0b86a832 | 580 | struct btrfs_timespec *tspec; |
39279cc3 CM |
581 | struct btrfs_root *root = BTRFS_I(inode)->root; |
582 | struct btrfs_key location; | |
583 | u64 alloc_group_block; | |
618e21d5 | 584 | u32 rdev; |
39279cc3 CM |
585 | int ret; |
586 | ||
587 | path = btrfs_alloc_path(); | |
588 | BUG_ON(!path); | |
39279cc3 | 589 | mutex_lock(&root->fs_info->fs_mutex); |
39279cc3 | 590 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 591 | |
39279cc3 | 592 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 593 | if (ret) |
39279cc3 | 594 | goto make_bad; |
39279cc3 | 595 | |
5f39d397 CM |
596 | leaf = path->nodes[0]; |
597 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
598 | struct btrfs_inode_item); | |
599 | ||
600 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
601 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
602 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
603 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
604 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
605 | ||
606 | tspec = btrfs_inode_atime(inode_item); | |
607 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
608 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
609 | ||
610 | tspec = btrfs_inode_mtime(inode_item); | |
611 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
612 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
613 | ||
614 | tspec = btrfs_inode_ctime(inode_item); | |
615 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
616 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
617 | ||
618 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
619 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 620 | inode->i_rdev = 0; |
5f39d397 CM |
621 | rdev = btrfs_inode_rdev(leaf, inode_item); |
622 | ||
623 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
624 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
625 | alloc_group_block); | |
b98b6767 | 626 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
e52ec0eb CM |
627 | if (!BTRFS_I(inode)->block_group) { |
628 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
0b86a832 CM |
629 | NULL, 0, |
630 | BTRFS_BLOCK_GROUP_METADATA, 0); | |
e52ec0eb | 631 | } |
39279cc3 CM |
632 | btrfs_free_path(path); |
633 | inode_item = NULL; | |
634 | ||
635 | mutex_unlock(&root->fs_info->fs_mutex); | |
636 | ||
637 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
638 | case S_IFREG: |
639 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 640 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 641 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
642 | inode->i_fop = &btrfs_file_operations; |
643 | inode->i_op = &btrfs_file_inode_operations; | |
644 | break; | |
645 | case S_IFDIR: | |
646 | inode->i_fop = &btrfs_dir_file_operations; | |
647 | if (root == root->fs_info->tree_root) | |
648 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
649 | else | |
650 | inode->i_op = &btrfs_dir_inode_operations; | |
651 | break; | |
652 | case S_IFLNK: | |
653 | inode->i_op = &btrfs_symlink_inode_operations; | |
654 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 655 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 656 | break; |
618e21d5 JB |
657 | default: |
658 | init_special_inode(inode, inode->i_mode, rdev); | |
659 | break; | |
39279cc3 CM |
660 | } |
661 | return; | |
662 | ||
663 | make_bad: | |
664 | btrfs_release_path(root, path); | |
665 | btrfs_free_path(path); | |
666 | mutex_unlock(&root->fs_info->fs_mutex); | |
667 | make_bad_inode(inode); | |
668 | } | |
669 | ||
5f39d397 CM |
670 | static void fill_inode_item(struct extent_buffer *leaf, |
671 | struct btrfs_inode_item *item, | |
39279cc3 CM |
672 | struct inode *inode) |
673 | { | |
5f39d397 CM |
674 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
675 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
676 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
677 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
678 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
679 | ||
680 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
681 | inode->i_atime.tv_sec); | |
682 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
683 | inode->i_atime.tv_nsec); | |
684 | ||
685 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
686 | inode->i_mtime.tv_sec); | |
687 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
688 | inode->i_mtime.tv_nsec); | |
689 | ||
690 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
691 | inode->i_ctime.tv_sec); | |
692 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
693 | inode->i_ctime.tv_nsec); | |
694 | ||
695 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
696 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
697 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
b98b6767 | 698 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
5f39d397 | 699 | btrfs_set_inode_block_group(leaf, item, |
39279cc3 CM |
700 | BTRFS_I(inode)->block_group->key.objectid); |
701 | } | |
702 | ||
a52d9a80 | 703 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
704 | struct btrfs_root *root, |
705 | struct inode *inode) | |
706 | { | |
707 | struct btrfs_inode_item *inode_item; | |
708 | struct btrfs_path *path; | |
5f39d397 | 709 | struct extent_buffer *leaf; |
39279cc3 CM |
710 | int ret; |
711 | ||
712 | path = btrfs_alloc_path(); | |
713 | BUG_ON(!path); | |
39279cc3 CM |
714 | ret = btrfs_lookup_inode(trans, root, path, |
715 | &BTRFS_I(inode)->location, 1); | |
716 | if (ret) { | |
717 | if (ret > 0) | |
718 | ret = -ENOENT; | |
719 | goto failed; | |
720 | } | |
721 | ||
5f39d397 CM |
722 | leaf = path->nodes[0]; |
723 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
724 | struct btrfs_inode_item); |
725 | ||
5f39d397 CM |
726 | fill_inode_item(leaf, inode_item, inode); |
727 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 728 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
729 | ret = 0; |
730 | failed: | |
731 | btrfs_release_path(root, path); | |
732 | btrfs_free_path(path); | |
733 | return ret; | |
734 | } | |
735 | ||
736 | ||
737 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
738 | struct btrfs_root *root, | |
739 | struct inode *dir, | |
740 | struct dentry *dentry) | |
741 | { | |
742 | struct btrfs_path *path; | |
743 | const char *name = dentry->d_name.name; | |
744 | int name_len = dentry->d_name.len; | |
745 | int ret = 0; | |
5f39d397 | 746 | struct extent_buffer *leaf; |
39279cc3 | 747 | struct btrfs_dir_item *di; |
5f39d397 | 748 | struct btrfs_key key; |
39279cc3 CM |
749 | |
750 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
751 | if (!path) { |
752 | ret = -ENOMEM; | |
753 | goto err; | |
754 | } | |
755 | ||
39279cc3 CM |
756 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
757 | name, name_len, -1); | |
758 | if (IS_ERR(di)) { | |
759 | ret = PTR_ERR(di); | |
760 | goto err; | |
761 | } | |
762 | if (!di) { | |
763 | ret = -ENOENT; | |
764 | goto err; | |
765 | } | |
5f39d397 CM |
766 | leaf = path->nodes[0]; |
767 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 768 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
769 | if (ret) |
770 | goto err; | |
39279cc3 CM |
771 | btrfs_release_path(root, path); |
772 | ||
773 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 774 | key.objectid, name, name_len, -1); |
39279cc3 CM |
775 | if (IS_ERR(di)) { |
776 | ret = PTR_ERR(di); | |
777 | goto err; | |
778 | } | |
779 | if (!di) { | |
780 | ret = -ENOENT; | |
781 | goto err; | |
782 | } | |
783 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
784 | |
785 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
786 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
787 | dentry->d_inode->i_ino, | |
788 | dentry->d_parent->d_inode->i_ino); | |
789 | if (ret) { | |
790 | printk("failed to delete reference to %.*s, " | |
791 | "inode %lu parent %lu\n", name_len, name, | |
792 | dentry->d_inode->i_ino, | |
793 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 794 | } |
39279cc3 CM |
795 | err: |
796 | btrfs_free_path(path); | |
797 | if (!ret) { | |
798 | dir->i_size -= name_len * 2; | |
79c44584 | 799 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 800 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
801 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
802 | dentry->d_inode->i_nlink--; | |
803 | #else | |
39279cc3 | 804 | drop_nlink(dentry->d_inode); |
6da6abae | 805 | #endif |
54aa1f4d | 806 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
807 | dir->i_sb->s_dirt = 1; |
808 | } | |
809 | return ret; | |
810 | } | |
811 | ||
812 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
813 | { | |
814 | struct btrfs_root *root; | |
815 | struct btrfs_trans_handle *trans; | |
2da98f00 | 816 | struct inode *inode = dentry->d_inode; |
39279cc3 | 817 | int ret; |
1832a6d5 | 818 | unsigned long nr = 0; |
39279cc3 CM |
819 | |
820 | root = BTRFS_I(dir)->root; | |
821 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
822 | |
823 | ret = btrfs_check_free_space(root, 1, 1); | |
824 | if (ret) | |
825 | goto fail; | |
826 | ||
39279cc3 | 827 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 828 | |
39279cc3 CM |
829 | btrfs_set_trans_block_group(trans, dir); |
830 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 831 | nr = trans->blocks_used; |
5f39d397 | 832 | |
2da98f00 CM |
833 | if (inode->i_nlink == 0) { |
834 | int found; | |
835 | /* if the inode isn't linked anywhere, | |
836 | * we don't need to worry about | |
837 | * data=ordered | |
838 | */ | |
839 | found = btrfs_del_ordered_inode(inode); | |
840 | if (found == 1) { | |
841 | atomic_dec(&inode->i_count); | |
842 | } | |
843 | } | |
844 | ||
39279cc3 | 845 | btrfs_end_transaction(trans, root); |
1832a6d5 | 846 | fail: |
39279cc3 | 847 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 848 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 849 | btrfs_throttle(root); |
39279cc3 CM |
850 | return ret; |
851 | } | |
852 | ||
853 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
854 | { | |
855 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 856 | int err = 0; |
39279cc3 CM |
857 | int ret; |
858 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 859 | struct btrfs_trans_handle *trans; |
1832a6d5 | 860 | unsigned long nr = 0; |
39279cc3 | 861 | |
134d4512 Y |
862 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
863 | return -ENOTEMPTY; | |
864 | ||
39279cc3 | 865 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
866 | ret = btrfs_check_free_space(root, 1, 1); |
867 | if (ret) | |
868 | goto fail; | |
869 | ||
39279cc3 CM |
870 | trans = btrfs_start_transaction(root, 1); |
871 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
872 | |
873 | /* now the directory is empty */ | |
874 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
875 | if (!err) { | |
876 | inode->i_size = 0; | |
877 | } | |
3954401f | 878 | |
d3c2fdcf | 879 | nr = trans->blocks_used; |
39279cc3 | 880 | ret = btrfs_end_transaction(trans, root); |
1832a6d5 | 881 | fail: |
134d4512 | 882 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 883 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 884 | btrfs_throttle(root); |
3954401f | 885 | |
39279cc3 CM |
886 | if (ret && !err) |
887 | err = ret; | |
888 | return err; | |
889 | } | |
890 | ||
39279cc3 CM |
891 | /* |
892 | * this can truncate away extent items, csum items and directory items. | |
893 | * It starts at a high offset and removes keys until it can't find | |
894 | * any higher than i_size. | |
895 | * | |
896 | * csum items that cross the new i_size are truncated to the new size | |
897 | * as well. | |
898 | */ | |
899 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
900 | struct btrfs_root *root, | |
85e21bac CM |
901 | struct inode *inode, |
902 | u32 min_type) | |
39279cc3 CM |
903 | { |
904 | int ret; | |
905 | struct btrfs_path *path; | |
906 | struct btrfs_key key; | |
5f39d397 | 907 | struct btrfs_key found_key; |
39279cc3 | 908 | u32 found_type; |
5f39d397 | 909 | struct extent_buffer *leaf; |
39279cc3 CM |
910 | struct btrfs_file_extent_item *fi; |
911 | u64 extent_start = 0; | |
db94535d | 912 | u64 extent_num_bytes = 0; |
39279cc3 | 913 | u64 item_end = 0; |
7bb86316 | 914 | u64 root_gen = 0; |
d8d5f3e1 | 915 | u64 root_owner = 0; |
39279cc3 CM |
916 | int found_extent; |
917 | int del_item; | |
85e21bac CM |
918 | int pending_del_nr = 0; |
919 | int pending_del_slot = 0; | |
179e29e4 | 920 | int extent_type = -1; |
3b951516 | 921 | u64 mask = root->sectorsize - 1; |
39279cc3 | 922 | |
3b951516 | 923 | btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1); |
39279cc3 | 924 | path = btrfs_alloc_path(); |
3c69faec | 925 | path->reada = -1; |
39279cc3 | 926 | BUG_ON(!path); |
5f39d397 | 927 | |
39279cc3 CM |
928 | /* FIXME, add redo link to tree so we don't leak on crash */ |
929 | key.objectid = inode->i_ino; | |
930 | key.offset = (u64)-1; | |
5f39d397 CM |
931 | key.type = (u8)-1; |
932 | ||
85e21bac CM |
933 | btrfs_init_path(path); |
934 | search_again: | |
935 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
936 | if (ret < 0) { | |
937 | goto error; | |
938 | } | |
939 | if (ret > 0) { | |
940 | BUG_ON(path->slots[0] == 0); | |
941 | path->slots[0]--; | |
942 | } | |
943 | ||
39279cc3 | 944 | while(1) { |
39279cc3 | 945 | fi = NULL; |
5f39d397 CM |
946 | leaf = path->nodes[0]; |
947 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
948 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 949 | |
5f39d397 | 950 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 951 | break; |
5f39d397 | 952 | |
85e21bac | 953 | if (found_type < min_type) |
39279cc3 CM |
954 | break; |
955 | ||
5f39d397 | 956 | item_end = found_key.offset; |
39279cc3 | 957 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 958 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 959 | struct btrfs_file_extent_item); |
179e29e4 CM |
960 | extent_type = btrfs_file_extent_type(leaf, fi); |
961 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 962 | item_end += |
db94535d | 963 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
964 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
965 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
966 | path->slots[0]); | |
967 | item_end += btrfs_file_extent_inline_len(leaf, | |
968 | item); | |
39279cc3 | 969 | } |
008630c1 | 970 | item_end--; |
39279cc3 CM |
971 | } |
972 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
973 | ret = btrfs_csum_truncate(trans, root, path, | |
974 | inode->i_size); | |
975 | BUG_ON(ret); | |
976 | } | |
008630c1 | 977 | if (item_end < inode->i_size) { |
b888db2b CM |
978 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
979 | found_type = BTRFS_INODE_ITEM_KEY; | |
980 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
981 | found_type = BTRFS_CSUM_ITEM_KEY; | |
85e21bac CM |
982 | } else if (found_type == BTRFS_EXTENT_DATA_KEY) { |
983 | found_type = BTRFS_XATTR_ITEM_KEY; | |
984 | } else if (found_type == BTRFS_XATTR_ITEM_KEY) { | |
985 | found_type = BTRFS_INODE_REF_KEY; | |
b888db2b CM |
986 | } else if (found_type) { |
987 | found_type--; | |
988 | } else { | |
989 | break; | |
39279cc3 | 990 | } |
a61721d5 | 991 | btrfs_set_key_type(&key, found_type); |
85e21bac | 992 | goto next; |
39279cc3 | 993 | } |
5f39d397 | 994 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
995 | del_item = 1; |
996 | else | |
997 | del_item = 0; | |
998 | found_extent = 0; | |
999 | ||
1000 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
1001 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
1002 | goto delete; | |
1003 | ||
1004 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 1005 | u64 num_dec; |
db94535d | 1006 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 1007 | if (!del_item) { |
db94535d CM |
1008 | u64 orig_num_bytes = |
1009 | btrfs_file_extent_num_bytes(leaf, fi); | |
1010 | extent_num_bytes = inode->i_size - | |
5f39d397 | 1011 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
1012 | extent_num_bytes = extent_num_bytes & |
1013 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
1014 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1015 | extent_num_bytes); | |
1016 | num_dec = (orig_num_bytes - | |
9069218d CM |
1017 | extent_num_bytes); |
1018 | if (extent_start != 0) | |
1019 | dec_i_blocks(inode, num_dec); | |
5f39d397 | 1020 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 1021 | } else { |
db94535d CM |
1022 | extent_num_bytes = |
1023 | btrfs_file_extent_disk_num_bytes(leaf, | |
1024 | fi); | |
39279cc3 | 1025 | /* FIXME blocksize != 4096 */ |
9069218d | 1026 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
1027 | if (extent_start != 0) { |
1028 | found_extent = 1; | |
9069218d | 1029 | dec_i_blocks(inode, num_dec); |
39279cc3 | 1030 | } |
d8d5f3e1 CM |
1031 | root_gen = btrfs_header_generation(leaf); |
1032 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 1033 | } |
9069218d CM |
1034 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
1035 | if (!del_item) { | |
1036 | u32 newsize = inode->i_size - found_key.offset; | |
1037 | dec_i_blocks(inode, item_end + 1 - | |
1038 | found_key.offset - newsize); | |
1039 | newsize = | |
1040 | btrfs_file_extent_calc_inline_size(newsize); | |
1041 | ret = btrfs_truncate_item(trans, root, path, | |
1042 | newsize, 1); | |
1043 | BUG_ON(ret); | |
1044 | } else { | |
1045 | dec_i_blocks(inode, item_end + 1 - | |
1046 | found_key.offset); | |
1047 | } | |
39279cc3 | 1048 | } |
179e29e4 | 1049 | delete: |
39279cc3 | 1050 | if (del_item) { |
85e21bac CM |
1051 | if (!pending_del_nr) { |
1052 | /* no pending yet, add ourselves */ | |
1053 | pending_del_slot = path->slots[0]; | |
1054 | pending_del_nr = 1; | |
1055 | } else if (pending_del_nr && | |
1056 | path->slots[0] + 1 == pending_del_slot) { | |
1057 | /* hop on the pending chunk */ | |
1058 | pending_del_nr++; | |
1059 | pending_del_slot = path->slots[0]; | |
1060 | } else { | |
1061 | printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot); | |
1062 | } | |
39279cc3 CM |
1063 | } else { |
1064 | break; | |
1065 | } | |
39279cc3 CM |
1066 | if (found_extent) { |
1067 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 1068 | extent_num_bytes, |
d8d5f3e1 | 1069 | root_owner, |
7bb86316 CM |
1070 | root_gen, inode->i_ino, |
1071 | found_key.offset, 0); | |
39279cc3 CM |
1072 | BUG_ON(ret); |
1073 | } | |
85e21bac CM |
1074 | next: |
1075 | if (path->slots[0] == 0) { | |
1076 | if (pending_del_nr) | |
1077 | goto del_pending; | |
1078 | btrfs_release_path(root, path); | |
1079 | goto search_again; | |
1080 | } | |
1081 | ||
1082 | path->slots[0]--; | |
1083 | if (pending_del_nr && | |
1084 | path->slots[0] + 1 != pending_del_slot) { | |
1085 | struct btrfs_key debug; | |
1086 | del_pending: | |
1087 | btrfs_item_key_to_cpu(path->nodes[0], &debug, | |
1088 | pending_del_slot); | |
1089 | ret = btrfs_del_items(trans, root, path, | |
1090 | pending_del_slot, | |
1091 | pending_del_nr); | |
1092 | BUG_ON(ret); | |
1093 | pending_del_nr = 0; | |
1094 | btrfs_release_path(root, path); | |
1095 | goto search_again; | |
1096 | } | |
39279cc3 CM |
1097 | } |
1098 | ret = 0; | |
1099 | error: | |
85e21bac CM |
1100 | if (pending_del_nr) { |
1101 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
1102 | pending_del_nr); | |
1103 | } | |
39279cc3 CM |
1104 | btrfs_release_path(root, path); |
1105 | btrfs_free_path(path); | |
1106 | inode->i_sb->s_dirt = 1; | |
1107 | return ret; | |
1108 | } | |
1109 | ||
b888db2b | 1110 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
1111 | size_t zero_start) |
1112 | { | |
1113 | char *kaddr; | |
d1310b2e | 1114 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
35ebb934 | 1115 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 1116 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1832a6d5 | 1117 | int ret = 0; |
a52d9a80 | 1118 | |
190662b2 | 1119 | WARN_ON(!PageLocked(page)); |
b3cfa35a | 1120 | set_page_extent_mapped(page); |
a52d9a80 | 1121 | |
d1310b2e | 1122 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 1123 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, |
b888db2b | 1124 | page_end, GFP_NOFS); |
1832a6d5 | 1125 | |
a52d9a80 | 1126 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 1127 | kaddr = kmap(page); |
a52d9a80 CM |
1128 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
1129 | flush_dcache_page(page); | |
b888db2b | 1130 | kunmap(page); |
a52d9a80 | 1131 | } |
b888db2b | 1132 | set_page_dirty(page); |
d1310b2e | 1133 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
a52d9a80 | 1134 | |
a52d9a80 CM |
1135 | return ret; |
1136 | } | |
1137 | ||
39279cc3 CM |
1138 | /* |
1139 | * taken from block_truncate_page, but does cow as it zeros out | |
1140 | * any bytes left in the last page in the file. | |
1141 | */ | |
1142 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
1143 | { | |
1144 | struct inode *inode = mapping->host; | |
db94535d CM |
1145 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1146 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
1147 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
1148 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
1149 | struct page *page; | |
39279cc3 | 1150 | int ret = 0; |
a52d9a80 | 1151 | u64 page_start; |
39279cc3 CM |
1152 | |
1153 | if ((offset & (blocksize - 1)) == 0) | |
1154 | goto out; | |
1155 | ||
1156 | ret = -ENOMEM; | |
1157 | page = grab_cache_page(mapping, index); | |
1158 | if (!page) | |
1159 | goto out; | |
39279cc3 | 1160 | if (!PageUptodate(page)) { |
9ebefb18 | 1161 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
1162 | lock_page(page); |
1163 | if (!PageUptodate(page)) { | |
1164 | ret = -EIO; | |
1165 | goto out; | |
1166 | } | |
1167 | } | |
35ebb934 | 1168 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 1169 | |
b888db2b | 1170 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 1171 | |
39279cc3 CM |
1172 | unlock_page(page); |
1173 | page_cache_release(page); | |
1174 | out: | |
1175 | return ret; | |
1176 | } | |
1177 | ||
1178 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
1179 | { | |
1180 | struct inode *inode = dentry->d_inode; | |
1181 | int err; | |
1182 | ||
1183 | err = inode_change_ok(inode, attr); | |
1184 | if (err) | |
1185 | return err; | |
1186 | ||
1187 | if (S_ISREG(inode->i_mode) && | |
1188 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
1189 | struct btrfs_trans_handle *trans; | |
1190 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 1191 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2bf5a725 | 1192 | |
5f39d397 | 1193 | u64 mask = root->sectorsize - 1; |
1b0f7c29 | 1194 | u64 hole_start = (inode->i_size + mask) & ~mask; |
f392a938 | 1195 | u64 block_end = (attr->ia_size + mask) & ~mask; |
39279cc3 | 1196 | u64 hole_size; |
179e29e4 | 1197 | u64 alloc_hint = 0; |
39279cc3 | 1198 | |
1b0f7c29 | 1199 | if (attr->ia_size <= hole_start) |
39279cc3 CM |
1200 | goto out; |
1201 | ||
1832a6d5 CM |
1202 | mutex_lock(&root->fs_info->fs_mutex); |
1203 | err = btrfs_check_free_space(root, 1, 0); | |
1204 | mutex_unlock(&root->fs_info->fs_mutex); | |
1205 | if (err) | |
1206 | goto fail; | |
1207 | ||
39279cc3 CM |
1208 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
1209 | ||
1b0f7c29 | 1210 | lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
5f56406a | 1211 | hole_size = block_end - hole_start; |
39279cc3 CM |
1212 | |
1213 | mutex_lock(&root->fs_info->fs_mutex); | |
1214 | trans = btrfs_start_transaction(root, 1); | |
1215 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 1216 | err = btrfs_drop_extents(trans, root, inode, |
1b0f7c29 | 1217 | hole_start, block_end, hole_start, |
3326d1b0 | 1218 | &alloc_hint); |
2bf5a725 | 1219 | |
179e29e4 CM |
1220 | if (alloc_hint != EXTENT_MAP_INLINE) { |
1221 | err = btrfs_insert_file_extent(trans, root, | |
1222 | inode->i_ino, | |
5f56406a CM |
1223 | hole_start, 0, 0, |
1224 | hole_size); | |
d1310b2e | 1225 | btrfs_drop_extent_cache(inode, hole_start, |
3b951516 | 1226 | (u64)-1); |
5f56406a | 1227 | btrfs_check_file(root, inode); |
179e29e4 | 1228 | } |
39279cc3 CM |
1229 | btrfs_end_transaction(trans, root); |
1230 | mutex_unlock(&root->fs_info->fs_mutex); | |
1b0f7c29 | 1231 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
54aa1f4d CM |
1232 | if (err) |
1233 | return err; | |
39279cc3 CM |
1234 | } |
1235 | out: | |
1236 | err = inode_setattr(inode, attr); | |
1832a6d5 | 1237 | fail: |
39279cc3 CM |
1238 | return err; |
1239 | } | |
61295eb8 | 1240 | |
2da98f00 | 1241 | void btrfs_put_inode(struct inode *inode) |
61295eb8 | 1242 | { |
2da98f00 CM |
1243 | int ret; |
1244 | ||
1245 | if (!BTRFS_I(inode)->ordered_trans) { | |
61295eb8 CM |
1246 | return; |
1247 | } | |
2da98f00 CM |
1248 | |
1249 | if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) || | |
1250 | mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)) | |
1251 | return; | |
1252 | ||
1253 | ret = btrfs_del_ordered_inode(inode); | |
1254 | if (ret == 1) { | |
1255 | atomic_dec(&inode->i_count); | |
1256 | } | |
61295eb8 CM |
1257 | } |
1258 | ||
39279cc3 CM |
1259 | void btrfs_delete_inode(struct inode *inode) |
1260 | { | |
1261 | struct btrfs_trans_handle *trans; | |
1262 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 1263 | unsigned long nr; |
39279cc3 CM |
1264 | int ret; |
1265 | ||
1266 | truncate_inode_pages(&inode->i_data, 0); | |
1267 | if (is_bad_inode(inode)) { | |
1268 | goto no_delete; | |
1269 | } | |
5f39d397 | 1270 | |
39279cc3 CM |
1271 | inode->i_size = 0; |
1272 | mutex_lock(&root->fs_info->fs_mutex); | |
1273 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1274 | |
39279cc3 | 1275 | btrfs_set_trans_block_group(trans, inode); |
85e21bac | 1276 | ret = btrfs_truncate_in_trans(trans, root, inode, 0); |
54aa1f4d CM |
1277 | if (ret) |
1278 | goto no_delete_lock; | |
85e21bac | 1279 | |
d3c2fdcf | 1280 | nr = trans->blocks_used; |
85e21bac | 1281 | clear_inode(inode); |
5f39d397 | 1282 | |
39279cc3 CM |
1283 | btrfs_end_transaction(trans, root); |
1284 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1285 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1286 | btrfs_throttle(root); |
39279cc3 | 1287 | return; |
54aa1f4d CM |
1288 | |
1289 | no_delete_lock: | |
d3c2fdcf | 1290 | nr = trans->blocks_used; |
54aa1f4d CM |
1291 | btrfs_end_transaction(trans, root); |
1292 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1293 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1294 | btrfs_throttle(root); |
39279cc3 CM |
1295 | no_delete: |
1296 | clear_inode(inode); | |
1297 | } | |
1298 | ||
1299 | /* | |
1300 | * this returns the key found in the dir entry in the location pointer. | |
1301 | * If no dir entries were found, location->objectid is 0. | |
1302 | */ | |
1303 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1304 | struct btrfs_key *location) | |
1305 | { | |
1306 | const char *name = dentry->d_name.name; | |
1307 | int namelen = dentry->d_name.len; | |
1308 | struct btrfs_dir_item *di; | |
1309 | struct btrfs_path *path; | |
1310 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1311 | int ret = 0; |
39279cc3 | 1312 | |
3954401f CM |
1313 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1314 | location->objectid = dir->i_ino; | |
1315 | location->type = BTRFS_INODE_ITEM_KEY; | |
1316 | location->offset = 0; | |
1317 | return 0; | |
1318 | } | |
39279cc3 CM |
1319 | path = btrfs_alloc_path(); |
1320 | BUG_ON(!path); | |
3954401f | 1321 | |
7a720536 | 1322 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1323 | struct btrfs_key key; |
1324 | struct extent_buffer *leaf; | |
1325 | u32 nritems; | |
1326 | int slot; | |
1327 | ||
1328 | key.objectid = dir->i_ino; | |
1329 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1330 | key.offset = 0; | |
1331 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1332 | BUG_ON(ret == 0); | |
1333 | ret = 0; | |
1334 | ||
1335 | leaf = path->nodes[0]; | |
1336 | slot = path->slots[0]; | |
1337 | nritems = btrfs_header_nritems(leaf); | |
1338 | if (slot >= nritems) | |
1339 | goto out_err; | |
1340 | ||
1341 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1342 | if (key.objectid != dir->i_ino || | |
1343 | key.type != BTRFS_INODE_REF_KEY) { | |
1344 | goto out_err; | |
1345 | } | |
1346 | location->objectid = key.offset; | |
1347 | location->type = BTRFS_INODE_ITEM_KEY; | |
1348 | location->offset = 0; | |
1349 | goto out; | |
1350 | } | |
1351 | ||
39279cc3 CM |
1352 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1353 | namelen, 0); | |
0d9f7f3e Y |
1354 | if (IS_ERR(di)) |
1355 | ret = PTR_ERR(di); | |
39279cc3 | 1356 | if (!di || IS_ERR(di)) { |
3954401f | 1357 | goto out_err; |
39279cc3 | 1358 | } |
5f39d397 | 1359 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1360 | out: |
39279cc3 CM |
1361 | btrfs_free_path(path); |
1362 | return ret; | |
3954401f CM |
1363 | out_err: |
1364 | location->objectid = 0; | |
1365 | goto out; | |
39279cc3 CM |
1366 | } |
1367 | ||
1368 | /* | |
1369 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1370 | * needs to be changed to reflect the root directory of the tree root. This | |
1371 | * is kind of like crossing a mount point. | |
1372 | */ | |
1373 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1374 | struct btrfs_key *location, | |
58176a96 JB |
1375 | struct btrfs_root **sub_root, |
1376 | struct dentry *dentry) | |
39279cc3 CM |
1377 | { |
1378 | struct btrfs_path *path; | |
1379 | struct btrfs_root_item *ri; | |
1380 | ||
1381 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1382 | return 0; | |
1383 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1384 | return 0; | |
1385 | ||
1386 | path = btrfs_alloc_path(); | |
1387 | BUG_ON(!path); | |
1388 | mutex_lock(&root->fs_info->fs_mutex); | |
1389 | ||
58176a96 JB |
1390 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1391 | dentry->d_name.name, | |
1392 | dentry->d_name.len); | |
39279cc3 CM |
1393 | if (IS_ERR(*sub_root)) |
1394 | return PTR_ERR(*sub_root); | |
1395 | ||
1396 | ri = &(*sub_root)->root_item; | |
1397 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1398 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1399 | location->offset = 0; | |
1400 | ||
1401 | btrfs_free_path(path); | |
1402 | mutex_unlock(&root->fs_info->fs_mutex); | |
1403 | return 0; | |
1404 | } | |
1405 | ||
1406 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1407 | { | |
1408 | struct btrfs_iget_args *args = p; | |
1409 | inode->i_ino = args->ino; | |
1410 | BTRFS_I(inode)->root = args->root; | |
9069218d | 1411 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e CM |
1412 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1413 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1414 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1415 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1416 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
1417 | return 0; |
1418 | } | |
1419 | ||
1420 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1421 | { | |
1422 | struct btrfs_iget_args *args = opaque; | |
1423 | return (args->ino == inode->i_ino && | |
1424 | args->root == BTRFS_I(inode)->root); | |
1425 | } | |
1426 | ||
dc17ff8f CM |
1427 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1428 | u64 root_objectid) | |
1429 | { | |
1430 | struct btrfs_iget_args args; | |
1431 | args.ino = objectid; | |
1432 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1433 | ||
1434 | if (!args.root) | |
1435 | return NULL; | |
1436 | ||
1437 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1438 | } | |
1439 | ||
39279cc3 CM |
1440 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1441 | struct btrfs_root *root) | |
1442 | { | |
1443 | struct inode *inode; | |
1444 | struct btrfs_iget_args args; | |
1445 | args.ino = objectid; | |
1446 | args.root = root; | |
1447 | ||
1448 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1449 | btrfs_init_locked_inode, | |
1450 | (void *)&args); | |
1451 | return inode; | |
1452 | } | |
1453 | ||
1454 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1455 | struct nameidata *nd) | |
1456 | { | |
1457 | struct inode * inode; | |
1458 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1459 | struct btrfs_root *root = bi->root; | |
1460 | struct btrfs_root *sub_root = root; | |
1461 | struct btrfs_key location; | |
1462 | int ret; | |
1463 | ||
1464 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1465 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1466 | |
39279cc3 CM |
1467 | mutex_lock(&root->fs_info->fs_mutex); |
1468 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1469 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1470 | |
39279cc3 CM |
1471 | if (ret < 0) |
1472 | return ERR_PTR(ret); | |
5f39d397 | 1473 | |
39279cc3 CM |
1474 | inode = NULL; |
1475 | if (location.objectid) { | |
58176a96 JB |
1476 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1477 | dentry); | |
39279cc3 CM |
1478 | if (ret < 0) |
1479 | return ERR_PTR(ret); | |
1480 | if (ret > 0) | |
1481 | return ERR_PTR(-ENOENT); | |
1482 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1483 | sub_root); | |
1484 | if (!inode) | |
1485 | return ERR_PTR(-EACCES); | |
1486 | if (inode->i_state & I_NEW) { | |
1487 | /* the inode and parent dir are two different roots */ | |
1488 | if (sub_root != root) { | |
1489 | igrab(inode); | |
1490 | sub_root->inode = inode; | |
1491 | } | |
1492 | BTRFS_I(inode)->root = sub_root; | |
1493 | memcpy(&BTRFS_I(inode)->location, &location, | |
1494 | sizeof(location)); | |
1495 | btrfs_read_locked_inode(inode); | |
1496 | unlock_new_inode(inode); | |
1497 | } | |
1498 | } | |
1499 | return d_splice_alias(inode, dentry); | |
1500 | } | |
1501 | ||
39279cc3 CM |
1502 | static unsigned char btrfs_filetype_table[] = { |
1503 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1504 | }; | |
1505 | ||
1506 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1507 | { | |
6da6abae | 1508 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1509 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1510 | struct btrfs_item *item; | |
1511 | struct btrfs_dir_item *di; | |
1512 | struct btrfs_key key; | |
5f39d397 | 1513 | struct btrfs_key found_key; |
39279cc3 CM |
1514 | struct btrfs_path *path; |
1515 | int ret; | |
1516 | u32 nritems; | |
5f39d397 | 1517 | struct extent_buffer *leaf; |
39279cc3 CM |
1518 | int slot; |
1519 | int advance; | |
1520 | unsigned char d_type; | |
1521 | int over = 0; | |
1522 | u32 di_cur; | |
1523 | u32 di_total; | |
1524 | u32 di_len; | |
1525 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1526 | char tmp_name[32]; |
1527 | char *name_ptr; | |
1528 | int name_len; | |
39279cc3 CM |
1529 | |
1530 | /* FIXME, use a real flag for deciding about the key type */ | |
1531 | if (root->fs_info->tree_root == root) | |
1532 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1533 | |
3954401f CM |
1534 | /* special case for "." */ |
1535 | if (filp->f_pos == 0) { | |
1536 | over = filldir(dirent, ".", 1, | |
1537 | 1, inode->i_ino, | |
1538 | DT_DIR); | |
1539 | if (over) | |
1540 | return 0; | |
1541 | filp->f_pos = 1; | |
1542 | } | |
1543 | ||
39279cc3 CM |
1544 | mutex_lock(&root->fs_info->fs_mutex); |
1545 | key.objectid = inode->i_ino; | |
3954401f CM |
1546 | path = btrfs_alloc_path(); |
1547 | path->reada = 2; | |
1548 | ||
1549 | /* special case for .., just use the back ref */ | |
1550 | if (filp->f_pos == 1) { | |
1551 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1552 | key.offset = 0; | |
1553 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1554 | BUG_ON(ret == 0); | |
1555 | leaf = path->nodes[0]; | |
1556 | slot = path->slots[0]; | |
1557 | nritems = btrfs_header_nritems(leaf); | |
1558 | if (slot >= nritems) { | |
1559 | btrfs_release_path(root, path); | |
1560 | goto read_dir_items; | |
1561 | } | |
1562 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1563 | btrfs_release_path(root, path); | |
1564 | if (found_key.objectid != key.objectid || | |
1565 | found_key.type != BTRFS_INODE_REF_KEY) | |
1566 | goto read_dir_items; | |
1567 | over = filldir(dirent, "..", 2, | |
1568 | 2, found_key.offset, DT_DIR); | |
1569 | if (over) | |
1570 | goto nopos; | |
1571 | filp->f_pos = 2; | |
1572 | } | |
1573 | ||
1574 | read_dir_items: | |
39279cc3 CM |
1575 | btrfs_set_key_type(&key, key_type); |
1576 | key.offset = filp->f_pos; | |
5f39d397 | 1577 | |
39279cc3 CM |
1578 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1579 | if (ret < 0) | |
1580 | goto err; | |
1581 | advance = 0; | |
39279cc3 | 1582 | while(1) { |
5f39d397 CM |
1583 | leaf = path->nodes[0]; |
1584 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1585 | slot = path->slots[0]; |
1586 | if (advance || slot >= nritems) { | |
1587 | if (slot >= nritems -1) { | |
39279cc3 CM |
1588 | ret = btrfs_next_leaf(root, path); |
1589 | if (ret) | |
1590 | break; | |
5f39d397 CM |
1591 | leaf = path->nodes[0]; |
1592 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1593 | slot = path->slots[0]; |
1594 | } else { | |
1595 | slot++; | |
1596 | path->slots[0]++; | |
1597 | } | |
1598 | } | |
1599 | advance = 1; | |
5f39d397 CM |
1600 | item = btrfs_item_nr(leaf, slot); |
1601 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1602 | ||
1603 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1604 | break; |
5f39d397 | 1605 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1606 | break; |
5f39d397 | 1607 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1608 | continue; |
5f39d397 CM |
1609 | |
1610 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1611 | advance = 1; |
1612 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1613 | di_cur = 0; | |
5f39d397 | 1614 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1615 | while(di_cur < di_total) { |
5f39d397 CM |
1616 | struct btrfs_key location; |
1617 | ||
1618 | name_len = btrfs_dir_name_len(leaf, di); | |
1619 | if (name_len < 32) { | |
1620 | name_ptr = tmp_name; | |
1621 | } else { | |
1622 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1623 | BUG_ON(!name_ptr); | |
1624 | } | |
1625 | read_extent_buffer(leaf, name_ptr, | |
1626 | (unsigned long)(di + 1), name_len); | |
1627 | ||
1628 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1629 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
1630 | over = filldir(dirent, name_ptr, name_len, |
1631 | found_key.offset, | |
1632 | location.objectid, | |
39279cc3 | 1633 | d_type); |
5f39d397 CM |
1634 | |
1635 | if (name_ptr != tmp_name) | |
1636 | kfree(name_ptr); | |
1637 | ||
39279cc3 CM |
1638 | if (over) |
1639 | goto nopos; | |
5103e947 JB |
1640 | di_len = btrfs_dir_name_len(leaf, di) + |
1641 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1642 | di_cur += di_len; |
1643 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1644 | } | |
1645 | } | |
5e591a07 YZ |
1646 | if (key_type == BTRFS_DIR_INDEX_KEY) |
1647 | filp->f_pos = INT_LIMIT(typeof(filp->f_pos)); | |
1648 | else | |
1649 | filp->f_pos++; | |
39279cc3 CM |
1650 | nopos: |
1651 | ret = 0; | |
1652 | err: | |
1653 | btrfs_release_path(root, path); | |
1654 | btrfs_free_path(path); | |
1655 | mutex_unlock(&root->fs_info->fs_mutex); | |
1656 | return ret; | |
1657 | } | |
1658 | ||
1659 | int btrfs_write_inode(struct inode *inode, int wait) | |
1660 | { | |
1661 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1662 | struct btrfs_trans_handle *trans; | |
1663 | int ret = 0; | |
1664 | ||
1665 | if (wait) { | |
1666 | mutex_lock(&root->fs_info->fs_mutex); | |
1667 | trans = btrfs_start_transaction(root, 1); | |
1668 | btrfs_set_trans_block_group(trans, inode); | |
1669 | ret = btrfs_commit_transaction(trans, root); | |
1670 | mutex_unlock(&root->fs_info->fs_mutex); | |
1671 | } | |
1672 | return ret; | |
1673 | } | |
1674 | ||
1675 | /* | |
54aa1f4d | 1676 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1677 | * inode changes. But, it is most likely to find the inode in cache. |
1678 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1679 | * to keep or drop this code. | |
1680 | */ | |
1681 | void btrfs_dirty_inode(struct inode *inode) | |
1682 | { | |
1683 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1684 | struct btrfs_trans_handle *trans; | |
1685 | ||
1686 | mutex_lock(&root->fs_info->fs_mutex); | |
1687 | trans = btrfs_start_transaction(root, 1); | |
1688 | btrfs_set_trans_block_group(trans, inode); | |
1689 | btrfs_update_inode(trans, root, inode); | |
1690 | btrfs_end_transaction(trans, root); | |
1691 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1692 | } |
1693 | ||
1694 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1695 | struct btrfs_root *root, | |
9c58309d CM |
1696 | const char *name, int name_len, |
1697 | u64 ref_objectid, | |
39279cc3 CM |
1698 | u64 objectid, |
1699 | struct btrfs_block_group_cache *group, | |
1700 | int mode) | |
1701 | { | |
1702 | struct inode *inode; | |
5f39d397 | 1703 | struct btrfs_inode_item *inode_item; |
6324fbf3 | 1704 | struct btrfs_block_group_cache *new_inode_group; |
39279cc3 | 1705 | struct btrfs_key *location; |
5f39d397 | 1706 | struct btrfs_path *path; |
9c58309d CM |
1707 | struct btrfs_inode_ref *ref; |
1708 | struct btrfs_key key[2]; | |
1709 | u32 sizes[2]; | |
1710 | unsigned long ptr; | |
39279cc3 CM |
1711 | int ret; |
1712 | int owner; | |
1713 | ||
5f39d397 CM |
1714 | path = btrfs_alloc_path(); |
1715 | BUG_ON(!path); | |
1716 | ||
39279cc3 CM |
1717 | inode = new_inode(root->fs_info->sb); |
1718 | if (!inode) | |
1719 | return ERR_PTR(-ENOMEM); | |
1720 | ||
d1310b2e CM |
1721 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1722 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1723 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1724 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1725 | inode->i_mapping, GFP_NOFS); | |
9069218d | 1726 | BTRFS_I(inode)->delalloc_bytes = 0; |
39279cc3 | 1727 | BTRFS_I(inode)->root = root; |
b888db2b | 1728 | |
39279cc3 CM |
1729 | if (mode & S_IFDIR) |
1730 | owner = 0; | |
1731 | else | |
1732 | owner = 1; | |
6324fbf3 | 1733 | new_inode_group = btrfs_find_block_group(root, group, 0, |
0b86a832 | 1734 | BTRFS_BLOCK_GROUP_METADATA, owner); |
6324fbf3 CM |
1735 | if (!new_inode_group) { |
1736 | printk("find_block group failed\n"); | |
1737 | new_inode_group = group; | |
1738 | } | |
1739 | BTRFS_I(inode)->block_group = new_inode_group; | |
b98b6767 | 1740 | BTRFS_I(inode)->flags = 0; |
9c58309d CM |
1741 | |
1742 | key[0].objectid = objectid; | |
1743 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
1744 | key[0].offset = 0; | |
1745 | ||
1746 | key[1].objectid = objectid; | |
1747 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
1748 | key[1].offset = ref_objectid; | |
1749 | ||
1750 | sizes[0] = sizeof(struct btrfs_inode_item); | |
1751 | sizes[1] = name_len + sizeof(*ref); | |
1752 | ||
1753 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); | |
1754 | if (ret != 0) | |
5f39d397 CM |
1755 | goto fail; |
1756 | ||
9c58309d CM |
1757 | if (objectid > root->highest_inode) |
1758 | root->highest_inode = objectid; | |
1759 | ||
39279cc3 CM |
1760 | inode->i_uid = current->fsuid; |
1761 | inode->i_gid = current->fsgid; | |
1762 | inode->i_mode = mode; | |
1763 | inode->i_ino = objectid; | |
1764 | inode->i_blocks = 0; | |
1765 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1766 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1767 | struct btrfs_inode_item); | |
1768 | fill_inode_item(path->nodes[0], inode_item, inode); | |
9c58309d CM |
1769 | |
1770 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
1771 | struct btrfs_inode_ref); | |
1772 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
1773 | ptr = (unsigned long)(ref + 1); | |
1774 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
1775 | ||
5f39d397 CM |
1776 | btrfs_mark_buffer_dirty(path->nodes[0]); |
1777 | btrfs_free_path(path); | |
1778 | ||
39279cc3 CM |
1779 | location = &BTRFS_I(inode)->location; |
1780 | location->objectid = objectid; | |
39279cc3 CM |
1781 | location->offset = 0; |
1782 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1783 | ||
39279cc3 CM |
1784 | insert_inode_hash(inode); |
1785 | return inode; | |
5f39d397 CM |
1786 | fail: |
1787 | btrfs_free_path(path); | |
1788 | return ERR_PTR(ret); | |
39279cc3 CM |
1789 | } |
1790 | ||
1791 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1792 | { | |
1793 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1794 | } | |
1795 | ||
1796 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1797 | struct dentry *dentry, struct inode *inode, |
1798 | int add_backref) | |
39279cc3 CM |
1799 | { |
1800 | int ret; | |
1801 | struct btrfs_key key; | |
1802 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1803 | struct inode *parent_inode; |
5f39d397 | 1804 | |
39279cc3 | 1805 | key.objectid = inode->i_ino; |
39279cc3 CM |
1806 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1807 | key.offset = 0; | |
1808 | ||
1809 | ret = btrfs_insert_dir_item(trans, root, | |
1810 | dentry->d_name.name, dentry->d_name.len, | |
1811 | dentry->d_parent->d_inode->i_ino, | |
1812 | &key, btrfs_inode_type(inode)); | |
1813 | if (ret == 0) { | |
9c58309d CM |
1814 | if (add_backref) { |
1815 | ret = btrfs_insert_inode_ref(trans, root, | |
1816 | dentry->d_name.name, | |
1817 | dentry->d_name.len, | |
1818 | inode->i_ino, | |
1819 | dentry->d_parent->d_inode->i_ino); | |
1820 | } | |
79c44584 CM |
1821 | parent_inode = dentry->d_parent->d_inode; |
1822 | parent_inode->i_size += dentry->d_name.len * 2; | |
1823 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1824 | ret = btrfs_update_inode(trans, root, |
1825 | dentry->d_parent->d_inode); | |
1826 | } | |
1827 | return ret; | |
1828 | } | |
1829 | ||
1830 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1831 | struct dentry *dentry, struct inode *inode, |
1832 | int backref) | |
39279cc3 | 1833 | { |
9c58309d | 1834 | int err = btrfs_add_link(trans, dentry, inode, backref); |
39279cc3 CM |
1835 | if (!err) { |
1836 | d_instantiate(dentry, inode); | |
1837 | return 0; | |
1838 | } | |
1839 | if (err > 0) | |
1840 | err = -EEXIST; | |
1841 | return err; | |
1842 | } | |
1843 | ||
618e21d5 JB |
1844 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1845 | int mode, dev_t rdev) | |
1846 | { | |
1847 | struct btrfs_trans_handle *trans; | |
1848 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1849 | struct inode *inode = NULL; |
618e21d5 JB |
1850 | int err; |
1851 | int drop_inode = 0; | |
1852 | u64 objectid; | |
1832a6d5 | 1853 | unsigned long nr = 0; |
618e21d5 JB |
1854 | |
1855 | if (!new_valid_dev(rdev)) | |
1856 | return -EINVAL; | |
1857 | ||
1858 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1859 | err = btrfs_check_free_space(root, 1, 0); |
1860 | if (err) | |
1861 | goto fail; | |
1862 | ||
618e21d5 JB |
1863 | trans = btrfs_start_transaction(root, 1); |
1864 | btrfs_set_trans_block_group(trans, dir); | |
1865 | ||
1866 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1867 | if (err) { | |
1868 | err = -ENOSPC; | |
1869 | goto out_unlock; | |
1870 | } | |
1871 | ||
9c58309d CM |
1872 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1873 | dentry->d_name.len, | |
1874 | dentry->d_parent->d_inode->i_ino, objectid, | |
618e21d5 JB |
1875 | BTRFS_I(dir)->block_group, mode); |
1876 | err = PTR_ERR(inode); | |
1877 | if (IS_ERR(inode)) | |
1878 | goto out_unlock; | |
1879 | ||
1880 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1881 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
618e21d5 JB |
1882 | if (err) |
1883 | drop_inode = 1; | |
1884 | else { | |
1885 | inode->i_op = &btrfs_special_inode_operations; | |
1886 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1887 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1888 | } |
1889 | dir->i_sb->s_dirt = 1; | |
1890 | btrfs_update_inode_block_group(trans, inode); | |
1891 | btrfs_update_inode_block_group(trans, dir); | |
1892 | out_unlock: | |
d3c2fdcf | 1893 | nr = trans->blocks_used; |
618e21d5 | 1894 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1895 | fail: |
618e21d5 JB |
1896 | mutex_unlock(&root->fs_info->fs_mutex); |
1897 | ||
1898 | if (drop_inode) { | |
1899 | inode_dec_link_count(inode); | |
1900 | iput(inode); | |
1901 | } | |
d3c2fdcf | 1902 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1903 | btrfs_throttle(root); |
618e21d5 JB |
1904 | return err; |
1905 | } | |
1906 | ||
39279cc3 CM |
1907 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1908 | int mode, struct nameidata *nd) | |
1909 | { | |
1910 | struct btrfs_trans_handle *trans; | |
1911 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1912 | struct inode *inode = NULL; |
39279cc3 CM |
1913 | int err; |
1914 | int drop_inode = 0; | |
1832a6d5 | 1915 | unsigned long nr = 0; |
39279cc3 CM |
1916 | u64 objectid; |
1917 | ||
1918 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1919 | err = btrfs_check_free_space(root, 1, 0); |
1920 | if (err) | |
1921 | goto fail; | |
39279cc3 CM |
1922 | trans = btrfs_start_transaction(root, 1); |
1923 | btrfs_set_trans_block_group(trans, dir); | |
1924 | ||
1925 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1926 | if (err) { | |
1927 | err = -ENOSPC; | |
1928 | goto out_unlock; | |
1929 | } | |
1930 | ||
9c58309d CM |
1931 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1932 | dentry->d_name.len, | |
1933 | dentry->d_parent->d_inode->i_ino, | |
1934 | objectid, BTRFS_I(dir)->block_group, mode); | |
39279cc3 CM |
1935 | err = PTR_ERR(inode); |
1936 | if (IS_ERR(inode)) | |
1937 | goto out_unlock; | |
1938 | ||
1939 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1940 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
1941 | if (err) |
1942 | drop_inode = 1; | |
1943 | else { | |
1944 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 1945 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
1946 | inode->i_fop = &btrfs_file_operations; |
1947 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
1948 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1949 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 1950 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1951 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1952 | inode->i_mapping, GFP_NOFS); | |
9069218d | 1953 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e | 1954 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
1955 | } |
1956 | dir->i_sb->s_dirt = 1; | |
1957 | btrfs_update_inode_block_group(trans, inode); | |
1958 | btrfs_update_inode_block_group(trans, dir); | |
1959 | out_unlock: | |
d3c2fdcf | 1960 | nr = trans->blocks_used; |
39279cc3 | 1961 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1962 | fail: |
39279cc3 CM |
1963 | mutex_unlock(&root->fs_info->fs_mutex); |
1964 | ||
1965 | if (drop_inode) { | |
1966 | inode_dec_link_count(inode); | |
1967 | iput(inode); | |
1968 | } | |
d3c2fdcf | 1969 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1970 | btrfs_throttle(root); |
39279cc3 CM |
1971 | return err; |
1972 | } | |
1973 | ||
1974 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1975 | struct dentry *dentry) | |
1976 | { | |
1977 | struct btrfs_trans_handle *trans; | |
1978 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1979 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 1980 | unsigned long nr = 0; |
39279cc3 CM |
1981 | int err; |
1982 | int drop_inode = 0; | |
1983 | ||
1984 | if (inode->i_nlink == 0) | |
1985 | return -ENOENT; | |
1986 | ||
6da6abae CM |
1987 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1988 | inode->i_nlink++; | |
1989 | #else | |
39279cc3 | 1990 | inc_nlink(inode); |
6da6abae | 1991 | #endif |
39279cc3 | 1992 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
1993 | err = btrfs_check_free_space(root, 1, 0); |
1994 | if (err) | |
1995 | goto fail; | |
39279cc3 | 1996 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1997 | |
39279cc3 CM |
1998 | btrfs_set_trans_block_group(trans, dir); |
1999 | atomic_inc(&inode->i_count); | |
9c58309d | 2000 | err = btrfs_add_nondir(trans, dentry, inode, 1); |
5f39d397 | 2001 | |
39279cc3 CM |
2002 | if (err) |
2003 | drop_inode = 1; | |
5f39d397 | 2004 | |
39279cc3 CM |
2005 | dir->i_sb->s_dirt = 1; |
2006 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 2007 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 2008 | |
54aa1f4d CM |
2009 | if (err) |
2010 | drop_inode = 1; | |
39279cc3 | 2011 | |
d3c2fdcf | 2012 | nr = trans->blocks_used; |
39279cc3 | 2013 | btrfs_end_transaction(trans, root); |
1832a6d5 | 2014 | fail: |
39279cc3 CM |
2015 | mutex_unlock(&root->fs_info->fs_mutex); |
2016 | ||
2017 | if (drop_inode) { | |
2018 | inode_dec_link_count(inode); | |
2019 | iput(inode); | |
2020 | } | |
d3c2fdcf | 2021 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2022 | btrfs_throttle(root); |
39279cc3 CM |
2023 | return err; |
2024 | } | |
2025 | ||
39279cc3 CM |
2026 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2027 | { | |
2028 | struct inode *inode; | |
2029 | struct btrfs_trans_handle *trans; | |
2030 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2031 | int err = 0; | |
2032 | int drop_on_err = 0; | |
2033 | u64 objectid; | |
d3c2fdcf | 2034 | unsigned long nr = 1; |
39279cc3 CM |
2035 | |
2036 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2037 | err = btrfs_check_free_space(root, 1, 0); |
2038 | if (err) | |
2039 | goto out_unlock; | |
2040 | ||
39279cc3 CM |
2041 | trans = btrfs_start_transaction(root, 1); |
2042 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 2043 | |
39279cc3 CM |
2044 | if (IS_ERR(trans)) { |
2045 | err = PTR_ERR(trans); | |
2046 | goto out_unlock; | |
2047 | } | |
2048 | ||
2049 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2050 | if (err) { | |
2051 | err = -ENOSPC; | |
2052 | goto out_unlock; | |
2053 | } | |
2054 | ||
9c58309d CM |
2055 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
2056 | dentry->d_name.len, | |
2057 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
2058 | BTRFS_I(dir)->block_group, S_IFDIR | mode); |
2059 | if (IS_ERR(inode)) { | |
2060 | err = PTR_ERR(inode); | |
2061 | goto out_fail; | |
2062 | } | |
5f39d397 | 2063 | |
39279cc3 CM |
2064 | drop_on_err = 1; |
2065 | inode->i_op = &btrfs_dir_inode_operations; | |
2066 | inode->i_fop = &btrfs_dir_file_operations; | |
2067 | btrfs_set_trans_block_group(trans, inode); | |
2068 | ||
3954401f | 2069 | inode->i_size = 0; |
39279cc3 CM |
2070 | err = btrfs_update_inode(trans, root, inode); |
2071 | if (err) | |
2072 | goto out_fail; | |
5f39d397 | 2073 | |
9c58309d | 2074 | err = btrfs_add_link(trans, dentry, inode, 0); |
39279cc3 CM |
2075 | if (err) |
2076 | goto out_fail; | |
5f39d397 | 2077 | |
39279cc3 CM |
2078 | d_instantiate(dentry, inode); |
2079 | drop_on_err = 0; | |
2080 | dir->i_sb->s_dirt = 1; | |
2081 | btrfs_update_inode_block_group(trans, inode); | |
2082 | btrfs_update_inode_block_group(trans, dir); | |
2083 | ||
2084 | out_fail: | |
d3c2fdcf | 2085 | nr = trans->blocks_used; |
39279cc3 | 2086 | btrfs_end_transaction(trans, root); |
5f39d397 | 2087 | |
39279cc3 CM |
2088 | out_unlock: |
2089 | mutex_unlock(&root->fs_info->fs_mutex); | |
2090 | if (drop_on_err) | |
2091 | iput(inode); | |
d3c2fdcf | 2092 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2093 | btrfs_throttle(root); |
39279cc3 CM |
2094 | return err; |
2095 | } | |
2096 | ||
3b951516 CM |
2097 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
2098 | struct extent_map *existing, | |
2099 | struct extent_map *em) | |
2100 | { | |
2101 | u64 start_diff; | |
2102 | u64 new_end; | |
2103 | int ret = 0; | |
2104 | int real_blocks = existing->block_start < EXTENT_MAP_LAST_BYTE; | |
2105 | ||
2106 | if (real_blocks && em->block_start >= EXTENT_MAP_LAST_BYTE) | |
2107 | goto invalid; | |
2108 | ||
2109 | if (!real_blocks && em->block_start != existing->block_start) | |
2110 | goto invalid; | |
2111 | ||
2112 | new_end = max(existing->start + existing->len, em->start + em->len); | |
2113 | ||
2114 | if (existing->start >= em->start) { | |
2115 | if (em->start + em->len < existing->start) | |
2116 | goto invalid; | |
2117 | ||
2118 | start_diff = existing->start - em->start; | |
2119 | if (real_blocks && em->block_start + start_diff != | |
2120 | existing->block_start) | |
2121 | goto invalid; | |
2122 | ||
2123 | em->len = new_end - em->start; | |
2124 | ||
2125 | remove_extent_mapping(em_tree, existing); | |
2126 | /* free for the tree */ | |
2127 | free_extent_map(existing); | |
2128 | ret = add_extent_mapping(em_tree, em); | |
2129 | ||
2130 | } else if (em->start > existing->start) { | |
2131 | ||
2132 | if (existing->start + existing->len < em->start) | |
2133 | goto invalid; | |
2134 | ||
2135 | start_diff = em->start - existing->start; | |
2136 | if (real_blocks && existing->block_start + start_diff != | |
2137 | em->block_start) | |
2138 | goto invalid; | |
2139 | ||
2140 | remove_extent_mapping(em_tree, existing); | |
2141 | em->block_start = existing->block_start; | |
2142 | em->start = existing->start; | |
2143 | em->len = new_end - existing->start; | |
2144 | free_extent_map(existing); | |
2145 | ||
2146 | ret = add_extent_mapping(em_tree, em); | |
2147 | } else { | |
2148 | goto invalid; | |
2149 | } | |
2150 | return ret; | |
2151 | ||
2152 | invalid: | |
2153 | printk("invalid extent map merge [%Lu %Lu %Lu] [%Lu %Lu %Lu]\n", | |
2154 | existing->start, existing->len, existing->block_start, | |
2155 | em->start, em->len, em->block_start); | |
2156 | return -EIO; | |
2157 | } | |
2158 | ||
a52d9a80 | 2159 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 2160 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
2161 | int create) |
2162 | { | |
2163 | int ret; | |
2164 | int err = 0; | |
db94535d | 2165 | u64 bytenr; |
a52d9a80 CM |
2166 | u64 extent_start = 0; |
2167 | u64 extent_end = 0; | |
2168 | u64 objectid = inode->i_ino; | |
2169 | u32 found_type; | |
a52d9a80 CM |
2170 | struct btrfs_path *path; |
2171 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2172 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
2173 | struct extent_buffer *leaf; |
2174 | struct btrfs_key found_key; | |
a52d9a80 CM |
2175 | struct extent_map *em = NULL; |
2176 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 2177 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 CM |
2178 | struct btrfs_trans_handle *trans = NULL; |
2179 | ||
2180 | path = btrfs_alloc_path(); | |
2181 | BUG_ON(!path); | |
2182 | mutex_lock(&root->fs_info->fs_mutex); | |
2183 | ||
2184 | again: | |
d1310b2e CM |
2185 | spin_lock(&em_tree->lock); |
2186 | em = lookup_extent_mapping(em_tree, start, len); | |
2187 | spin_unlock(&em_tree->lock); | |
2188 | ||
a52d9a80 | 2189 | if (em) { |
56b453c9 | 2190 | if (em->start > start) { |
d1310b2e CM |
2191 | printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n", |
2192 | start, len, em->start, em->len); | |
56b453c9 CM |
2193 | WARN_ON(1); |
2194 | } | |
70dec807 CM |
2195 | if (em->block_start == EXTENT_MAP_INLINE && page) |
2196 | free_extent_map(em); | |
2197 | else | |
2198 | goto out; | |
a52d9a80 | 2199 | } |
d1310b2e | 2200 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 2201 | if (!em) { |
d1310b2e CM |
2202 | err = -ENOMEM; |
2203 | goto out; | |
a52d9a80 | 2204 | } |
d1310b2e CM |
2205 | |
2206 | em->start = EXTENT_MAP_HOLE; | |
2207 | em->len = (u64)-1; | |
a52d9a80 | 2208 | em->bdev = inode->i_sb->s_bdev; |
179e29e4 CM |
2209 | ret = btrfs_lookup_file_extent(trans, root, path, |
2210 | objectid, start, trans != NULL); | |
a52d9a80 CM |
2211 | if (ret < 0) { |
2212 | err = ret; | |
2213 | goto out; | |
2214 | } | |
2215 | ||
2216 | if (ret != 0) { | |
2217 | if (path->slots[0] == 0) | |
2218 | goto not_found; | |
2219 | path->slots[0]--; | |
2220 | } | |
2221 | ||
5f39d397 CM |
2222 | leaf = path->nodes[0]; |
2223 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 2224 | struct btrfs_file_extent_item); |
a52d9a80 | 2225 | /* are we inside the extent that was found? */ |
5f39d397 CM |
2226 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
2227 | found_type = btrfs_key_type(&found_key); | |
2228 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
2229 | found_type != BTRFS_EXTENT_DATA_KEY) { |
2230 | goto not_found; | |
2231 | } | |
2232 | ||
5f39d397 CM |
2233 | found_type = btrfs_file_extent_type(leaf, item); |
2234 | extent_start = found_key.offset; | |
a52d9a80 CM |
2235 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
2236 | extent_end = extent_start + | |
db94535d | 2237 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 2238 | err = 0; |
b888db2b | 2239 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2240 | em->start = start; |
2241 | if (start < extent_start) { | |
d1310b2e | 2242 | if (start + len <= extent_start) |
b888db2b | 2243 | goto not_found; |
d1310b2e | 2244 | em->len = extent_end - extent_start; |
a52d9a80 | 2245 | } else { |
d1310b2e | 2246 | em->len = len; |
a52d9a80 CM |
2247 | } |
2248 | goto not_found_em; | |
2249 | } | |
db94535d CM |
2250 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
2251 | if (bytenr == 0) { | |
a52d9a80 | 2252 | em->start = extent_start; |
d1310b2e | 2253 | em->len = extent_end - extent_start; |
5f39d397 | 2254 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2255 | goto insert; |
2256 | } | |
db94535d CM |
2257 | bytenr += btrfs_file_extent_offset(leaf, item); |
2258 | em->block_start = bytenr; | |
a52d9a80 | 2259 | em->start = extent_start; |
d1310b2e | 2260 | em->len = extent_end - extent_start; |
a52d9a80 CM |
2261 | goto insert; |
2262 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
70dec807 | 2263 | u64 page_start; |
5f39d397 | 2264 | unsigned long ptr; |
a52d9a80 | 2265 | char *map; |
3326d1b0 CM |
2266 | size_t size; |
2267 | size_t extent_offset; | |
2268 | size_t copy_size; | |
a52d9a80 | 2269 | |
5f39d397 CM |
2270 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
2271 | path->slots[0])); | |
d1310b2e CM |
2272 | extent_end = (extent_start + size + root->sectorsize - 1) & |
2273 | ~((u64)root->sectorsize - 1); | |
b888db2b | 2274 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2275 | em->start = start; |
2276 | if (start < extent_start) { | |
d1310b2e | 2277 | if (start + len <= extent_start) |
b888db2b | 2278 | goto not_found; |
d1310b2e | 2279 | em->len = extent_end - extent_start; |
a52d9a80 | 2280 | } else { |
d1310b2e | 2281 | em->len = len; |
a52d9a80 CM |
2282 | } |
2283 | goto not_found_em; | |
2284 | } | |
689f9346 | 2285 | em->block_start = EXTENT_MAP_INLINE; |
689f9346 Y |
2286 | |
2287 | if (!page) { | |
2288 | em->start = extent_start; | |
d1310b2e | 2289 | em->len = size; |
689f9346 Y |
2290 | goto out; |
2291 | } | |
5f39d397 | 2292 | |
70dec807 CM |
2293 | page_start = page_offset(page) + pg_offset; |
2294 | extent_offset = page_start - extent_start; | |
2295 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, | |
3326d1b0 | 2296 | size - extent_offset); |
3326d1b0 | 2297 | em->start = extent_start + extent_offset; |
70dec807 CM |
2298 | em->len = (copy_size + root->sectorsize - 1) & |
2299 | ~((u64)root->sectorsize - 1); | |
689f9346 Y |
2300 | map = kmap(page); |
2301 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 | 2302 | if (create == 0 && !PageUptodate(page)) { |
70dec807 | 2303 | read_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2304 | copy_size); |
2305 | flush_dcache_page(page); | |
2306 | } else if (create && PageUptodate(page)) { | |
2307 | if (!trans) { | |
2308 | kunmap(page); | |
2309 | free_extent_map(em); | |
2310 | em = NULL; | |
2311 | btrfs_release_path(root, path); | |
2312 | trans = btrfs_start_transaction(root, 1); | |
2313 | goto again; | |
2314 | } | |
70dec807 | 2315 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2316 | copy_size); |
2317 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 2318 | } |
a52d9a80 | 2319 | kunmap(page); |
d1310b2e CM |
2320 | set_extent_uptodate(io_tree, em->start, |
2321 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
2322 | goto insert; |
2323 | } else { | |
2324 | printk("unkknown found_type %d\n", found_type); | |
2325 | WARN_ON(1); | |
2326 | } | |
2327 | not_found: | |
2328 | em->start = start; | |
d1310b2e | 2329 | em->len = len; |
a52d9a80 | 2330 | not_found_em: |
5f39d397 | 2331 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2332 | insert: |
2333 | btrfs_release_path(root, path); | |
d1310b2e CM |
2334 | if (em->start > start || extent_map_end(em) <= start) { |
2335 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); | |
a52d9a80 CM |
2336 | err = -EIO; |
2337 | goto out; | |
2338 | } | |
d1310b2e CM |
2339 | |
2340 | err = 0; | |
2341 | spin_lock(&em_tree->lock); | |
a52d9a80 | 2342 | ret = add_extent_mapping(em_tree, em); |
3b951516 CM |
2343 | |
2344 | /* it is possible that someone inserted the extent into the tree | |
2345 | * while we had the lock dropped. It is also possible that | |
2346 | * an overlapping map exists in the tree | |
2347 | */ | |
a52d9a80 | 2348 | if (ret == -EEXIST) { |
3b951516 CM |
2349 | struct extent_map *existing; |
2350 | existing = lookup_extent_mapping(em_tree, start, len); | |
2351 | if (!existing) { | |
2352 | existing = lookup_extent_mapping(em_tree, em->start, | |
2353 | em->len); | |
2354 | if (existing) { | |
2355 | err = merge_extent_mapping(em_tree, existing, | |
2356 | em); | |
2357 | free_extent_map(existing); | |
2358 | if (err) { | |
2359 | free_extent_map(em); | |
2360 | em = NULL; | |
2361 | } | |
2362 | } else { | |
2363 | err = -EIO; | |
2364 | printk("failing to insert %Lu %Lu\n", | |
2365 | start, len); | |
2366 | free_extent_map(em); | |
2367 | em = NULL; | |
2368 | } | |
2369 | } else { | |
2370 | free_extent_map(em); | |
2371 | em = existing; | |
a52d9a80 | 2372 | } |
a52d9a80 | 2373 | } |
d1310b2e | 2374 | spin_unlock(&em_tree->lock); |
a52d9a80 CM |
2375 | out: |
2376 | btrfs_free_path(path); | |
2377 | if (trans) { | |
2378 | ret = btrfs_end_transaction(trans, root); | |
2379 | if (!err) | |
2380 | err = ret; | |
2381 | } | |
2382 | mutex_unlock(&root->fs_info->fs_mutex); | |
2383 | if (err) { | |
2384 | free_extent_map(em); | |
2385 | WARN_ON(1); | |
2386 | return ERR_PTR(err); | |
2387 | } | |
2388 | return em; | |
2389 | } | |
2390 | ||
16432985 CM |
2391 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
2392 | struct buffer_head *bh_result, int create) | |
2393 | { | |
2394 | struct extent_map *em; | |
2395 | u64 start = (u64)iblock << inode->i_blkbits; | |
2396 | struct btrfs_multi_bio *multi = NULL; | |
2397 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2398 | u64 len; | |
2399 | u64 logical; | |
2400 | u64 map_length; | |
2401 | int ret = 0; | |
2402 | ||
2403 | em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0); | |
2404 | ||
2405 | if (!em || IS_ERR(em)) | |
2406 | goto out; | |
2407 | ||
2408 | if (em->start > start || em->start + em->len <= start) | |
2409 | goto out; | |
2410 | ||
2411 | if (em->block_start == EXTENT_MAP_INLINE) { | |
2412 | ret = -EINVAL; | |
2413 | goto out; | |
2414 | } | |
2415 | ||
2416 | if (em->block_start == EXTENT_MAP_HOLE || | |
2417 | em->block_start == EXTENT_MAP_DELALLOC) { | |
2418 | goto out; | |
2419 | } | |
2420 | ||
2421 | len = em->start + em->len - start; | |
2422 | len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size))); | |
2423 | ||
2424 | logical = start - em->start; | |
2425 | logical = em->block_start + logical; | |
2426 | ||
2427 | map_length = len; | |
2428 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
2429 | logical, &map_length, &multi, 0); | |
2430 | BUG_ON(ret); | |
2431 | bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits; | |
2432 | bh_result->b_size = min(map_length, len); | |
2433 | bh_result->b_bdev = multi->stripes[0].dev->bdev; | |
2434 | set_buffer_mapped(bh_result); | |
2435 | kfree(multi); | |
2436 | out: | |
2437 | free_extent_map(em); | |
2438 | return ret; | |
2439 | } | |
2440 | ||
2441 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, | |
2442 | const struct iovec *iov, loff_t offset, | |
2443 | unsigned long nr_segs) | |
2444 | { | |
2445 | struct file *file = iocb->ki_filp; | |
2446 | struct inode *inode = file->f_mapping->host; | |
2447 | ||
2448 | if (rw == WRITE) | |
2449 | return -EINVAL; | |
2450 | ||
2451 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
2452 | offset, nr_segs, btrfs_get_block, NULL); | |
2453 | } | |
2454 | ||
d396c6f5 | 2455 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 2456 | { |
d396c6f5 | 2457 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
2458 | } |
2459 | ||
a52d9a80 | 2460 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 2461 | { |
d1310b2e CM |
2462 | struct extent_io_tree *tree; |
2463 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 2464 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 2465 | } |
1832a6d5 | 2466 | |
a52d9a80 | 2467 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2468 | { |
d1310b2e | 2469 | struct extent_io_tree *tree; |
b888db2b CM |
2470 | |
2471 | ||
2472 | if (current->flags & PF_MEMALLOC) { | |
2473 | redirty_page_for_writepage(wbc, page); | |
2474 | unlock_page(page); | |
2475 | return 0; | |
2476 | } | |
d1310b2e | 2477 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 2478 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
2479 | } |
2480 | ||
b293f02e CM |
2481 | static int btrfs_writepages(struct address_space *mapping, |
2482 | struct writeback_control *wbc) | |
2483 | { | |
d1310b2e CM |
2484 | struct extent_io_tree *tree; |
2485 | tree = &BTRFS_I(mapping->host)->io_tree; | |
b293f02e CM |
2486 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2487 | } | |
2488 | ||
3ab2fb5a CM |
2489 | static int |
2490 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2491 | struct list_head *pages, unsigned nr_pages) | |
2492 | { | |
d1310b2e CM |
2493 | struct extent_io_tree *tree; |
2494 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
2495 | return extent_readpages(tree, mapping, pages, nr_pages, |
2496 | btrfs_get_extent); | |
2497 | } | |
2498 | ||
70dec807 | 2499 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 2500 | { |
d1310b2e CM |
2501 | struct extent_io_tree *tree; |
2502 | struct extent_map_tree *map; | |
a52d9a80 | 2503 | int ret; |
8c2383c3 | 2504 | |
d1310b2e CM |
2505 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2506 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 2507 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 | 2508 | if (ret == 1) { |
4ef64eae | 2509 | invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE); |
a52d9a80 CM |
2510 | ClearPagePrivate(page); |
2511 | set_page_private(page, 0); | |
2512 | page_cache_release(page); | |
39279cc3 | 2513 | } |
a52d9a80 | 2514 | return ret; |
39279cc3 CM |
2515 | } |
2516 | ||
a52d9a80 | 2517 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2518 | { |
d1310b2e | 2519 | struct extent_io_tree *tree; |
39279cc3 | 2520 | |
d1310b2e | 2521 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 CM |
2522 | extent_invalidatepage(tree, page, offset); |
2523 | btrfs_releasepage(page, GFP_NOFS); | |
9ad6b7bc | 2524 | if (PagePrivate(page)) { |
4ef64eae | 2525 | invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE); |
9ad6b7bc CM |
2526 | ClearPagePrivate(page); |
2527 | set_page_private(page, 0); | |
2528 | page_cache_release(page); | |
2529 | } | |
39279cc3 CM |
2530 | } |
2531 | ||
9ebefb18 CM |
2532 | /* |
2533 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2534 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2535 | * be careful to check for EOF conditions here. We set the page up correctly | |
2536 | * for a written page which means we get ENOSPC checking when writing into | |
2537 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2538 | * support these features. | |
2539 | * | |
2540 | * We are not allowed to take the i_mutex here so we have to play games to | |
2541 | * protect against truncate races as the page could now be beyond EOF. Because | |
2542 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2543 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2544 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2545 | * unlock the page. | |
2546 | */ | |
2547 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2548 | { | |
6da6abae | 2549 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2550 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9ebefb18 CM |
2551 | unsigned long end; |
2552 | loff_t size; | |
1832a6d5 | 2553 | int ret; |
a52d9a80 | 2554 | u64 page_start; |
9ebefb18 | 2555 | |
1832a6d5 CM |
2556 | mutex_lock(&root->fs_info->fs_mutex); |
2557 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); | |
8f662a76 | 2558 | mutex_unlock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2559 | if (ret) |
2560 | goto out; | |
2561 | ||
2562 | ret = -EINVAL; | |
2563 | ||
9ebefb18 CM |
2564 | lock_page(page); |
2565 | wait_on_page_writeback(page); | |
9ebefb18 | 2566 | size = i_size_read(inode); |
35ebb934 | 2567 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 2568 | |
9ebefb18 | 2569 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 2570 | (page_start > size)) { |
9ebefb18 CM |
2571 | /* page got truncated out from underneath us */ |
2572 | goto out_unlock; | |
2573 | } | |
2574 | ||
2575 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2576 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
2577 | end = size & ~PAGE_CACHE_MASK; |
2578 | else | |
2579 | end = PAGE_CACHE_SIZE; | |
2580 | ||
b888db2b | 2581 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
2582 | |
2583 | out_unlock: | |
2584 | unlock_page(page); | |
1832a6d5 | 2585 | out: |
9ebefb18 CM |
2586 | return ret; |
2587 | } | |
2588 | ||
39279cc3 CM |
2589 | static void btrfs_truncate(struct inode *inode) |
2590 | { | |
2591 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2592 | int ret; | |
2593 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2594 | unsigned long nr; |
39279cc3 CM |
2595 | |
2596 | if (!S_ISREG(inode->i_mode)) | |
2597 | return; | |
2598 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2599 | return; | |
2600 | ||
2601 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2602 | ||
2603 | mutex_lock(&root->fs_info->fs_mutex); | |
2604 | trans = btrfs_start_transaction(root, 1); | |
2605 | btrfs_set_trans_block_group(trans, inode); | |
2606 | ||
2607 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
85e21bac CM |
2608 | ret = btrfs_truncate_in_trans(trans, root, inode, |
2609 | BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 2610 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2611 | nr = trans->blocks_used; |
5f39d397 | 2612 | |
39279cc3 CM |
2613 | ret = btrfs_end_transaction(trans, root); |
2614 | BUG_ON(ret); | |
2615 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2616 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2617 | btrfs_throttle(root); |
39279cc3 CM |
2618 | } |
2619 | ||
4313b399 CM |
2620 | static int noinline create_subvol(struct btrfs_root *root, char *name, |
2621 | int namelen) | |
39279cc3 CM |
2622 | { |
2623 | struct btrfs_trans_handle *trans; | |
2624 | struct btrfs_key key; | |
2625 | struct btrfs_root_item root_item; | |
2626 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2627 | struct extent_buffer *leaf; |
dc17ff8f | 2628 | struct btrfs_root *new_root = root; |
39279cc3 CM |
2629 | struct inode *inode; |
2630 | struct inode *dir; | |
2631 | int ret; | |
54aa1f4d | 2632 | int err; |
39279cc3 CM |
2633 | u64 objectid; |
2634 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2635 | unsigned long nr = 1; |
39279cc3 CM |
2636 | |
2637 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2638 | ret = btrfs_check_free_space(root, 1, 0); |
2639 | if (ret) | |
2640 | goto fail_commit; | |
2641 | ||
39279cc3 CM |
2642 | trans = btrfs_start_transaction(root, 1); |
2643 | BUG_ON(!trans); | |
2644 | ||
7bb86316 CM |
2645 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2646 | 0, &objectid); | |
2647 | if (ret) | |
2648 | goto fail; | |
2649 | ||
2650 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2651 | objectid, trans->transid, 0, 0, | |
2652 | 0, 0); | |
5f39d397 CM |
2653 | if (IS_ERR(leaf)) |
2654 | return PTR_ERR(leaf); | |
2655 | ||
2656 | btrfs_set_header_nritems(leaf, 0); | |
2657 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2658 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2659 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2660 | btrfs_set_header_owner(leaf, objectid); |
2661 | ||
5f39d397 CM |
2662 | write_extent_buffer(leaf, root->fs_info->fsid, |
2663 | (unsigned long)btrfs_header_fsid(leaf), | |
2664 | BTRFS_FSID_SIZE); | |
2665 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2666 | |
2667 | inode_item = &root_item.inode; | |
2668 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2669 | inode_item->generation = cpu_to_le64(1); |
2670 | inode_item->size = cpu_to_le64(3); | |
2671 | inode_item->nlink = cpu_to_le32(1); | |
2672 | inode_item->nblocks = cpu_to_le64(1); | |
2673 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2674 | |
db94535d CM |
2675 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2676 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2677 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2678 | btrfs_set_root_used(&root_item, 0); |
2679 | ||
5eda7b5e CM |
2680 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2681 | root_item.drop_level = 0; | |
5f39d397 CM |
2682 | |
2683 | free_extent_buffer(leaf); | |
2684 | leaf = NULL; | |
39279cc3 | 2685 | |
39279cc3 CM |
2686 | btrfs_set_root_dirid(&root_item, new_dirid); |
2687 | ||
2688 | key.objectid = objectid; | |
2689 | key.offset = 1; | |
39279cc3 CM |
2690 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2691 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2692 | &root_item); | |
54aa1f4d CM |
2693 | if (ret) |
2694 | goto fail; | |
39279cc3 CM |
2695 | |
2696 | /* | |
2697 | * insert the directory item | |
2698 | */ | |
2699 | key.offset = (u64)-1; | |
2700 | dir = root->fs_info->sb->s_root->d_inode; | |
2701 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2702 | name, namelen, dir->i_ino, &key, | |
2703 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2704 | if (ret) |
2705 | goto fail; | |
39279cc3 | 2706 | |
3954401f CM |
2707 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2708 | name, namelen, objectid, | |
2709 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2710 | if (ret) | |
2711 | goto fail; | |
2712 | ||
39279cc3 | 2713 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2714 | if (ret) |
2715 | goto fail_commit; | |
39279cc3 | 2716 | |
58176a96 | 2717 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2718 | BUG_ON(!new_root); |
2719 | ||
2720 | trans = btrfs_start_transaction(new_root, 1); | |
2721 | BUG_ON(!trans); | |
2722 | ||
9c58309d CM |
2723 | inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid, |
2724 | new_dirid, | |
39279cc3 | 2725 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); |
54aa1f4d CM |
2726 | if (IS_ERR(inode)) |
2727 | goto fail; | |
39279cc3 CM |
2728 | inode->i_op = &btrfs_dir_inode_operations; |
2729 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2730 | new_root->inode = inode; |
39279cc3 | 2731 | |
3954401f CM |
2732 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2733 | new_dirid); | |
39279cc3 | 2734 | inode->i_nlink = 1; |
3954401f | 2735 | inode->i_size = 0; |
39279cc3 | 2736 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2737 | if (ret) |
2738 | goto fail; | |
2739 | fail: | |
d3c2fdcf | 2740 | nr = trans->blocks_used; |
dc17ff8f | 2741 | err = btrfs_commit_transaction(trans, new_root); |
54aa1f4d CM |
2742 | if (err && !ret) |
2743 | ret = err; | |
2744 | fail_commit: | |
39279cc3 | 2745 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2746 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2747 | btrfs_throttle(root); |
54aa1f4d | 2748 | return ret; |
39279cc3 CM |
2749 | } |
2750 | ||
2751 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2752 | { | |
3063d29f | 2753 | struct btrfs_pending_snapshot *pending_snapshot; |
39279cc3 | 2754 | struct btrfs_trans_handle *trans; |
39279cc3 | 2755 | int ret; |
54aa1f4d | 2756 | int err; |
1832a6d5 | 2757 | unsigned long nr = 0; |
39279cc3 CM |
2758 | |
2759 | if (!root->ref_cows) | |
2760 | return -EINVAL; | |
2761 | ||
2762 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2763 | ret = btrfs_check_free_space(root, 1, 0); |
2764 | if (ret) | |
2765 | goto fail_unlock; | |
2766 | ||
3063d29f CM |
2767 | pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS); |
2768 | if (!pending_snapshot) { | |
2769 | ret = -ENOMEM; | |
2770 | goto fail_unlock; | |
2771 | } | |
fb4bc1e0 | 2772 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); |
3063d29f CM |
2773 | if (!pending_snapshot->name) { |
2774 | ret = -ENOMEM; | |
2775 | kfree(pending_snapshot); | |
2776 | goto fail_unlock; | |
2777 | } | |
fb4bc1e0 Y |
2778 | memcpy(pending_snapshot->name, name, namelen); |
2779 | pending_snapshot->name[namelen] = '\0'; | |
39279cc3 CM |
2780 | trans = btrfs_start_transaction(root, 1); |
2781 | BUG_ON(!trans); | |
3063d29f CM |
2782 | pending_snapshot->root = root; |
2783 | list_add(&pending_snapshot->list, | |
2784 | &trans->transaction->pending_snapshots); | |
39279cc3 | 2785 | ret = btrfs_update_inode(trans, root, root->inode); |
54aa1f4d | 2786 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2787 | |
1832a6d5 | 2788 | fail_unlock: |
39279cc3 | 2789 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2790 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2791 | btrfs_throttle(root); |
54aa1f4d | 2792 | return ret; |
39279cc3 CM |
2793 | } |
2794 | ||
edbd8d4e | 2795 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
2796 | struct file_ra_state *ra, struct file *file, |
2797 | pgoff_t offset, pgoff_t last_index) | |
2798 | { | |
2799 | pgoff_t req_size; | |
2800 | ||
2801 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2802 | req_size = last_index - offset + 1; | |
2803 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2804 | return offset; | |
2805 | #else | |
2806 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2807 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2808 | return offset + req_size; | |
2809 | #endif | |
2810 | } | |
2811 | ||
2812 | int btrfs_defrag_file(struct file *file) { | |
6da6abae | 2813 | struct inode *inode = fdentry(file)->d_inode; |
1832a6d5 | 2814 | struct btrfs_root *root = BTRFS_I(inode)->root; |
d1310b2e | 2815 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
86479a04 CM |
2816 | struct page *page; |
2817 | unsigned long last_index; | |
2818 | unsigned long ra_index = 0; | |
2819 | u64 page_start; | |
2820 | u64 page_end; | |
2821 | unsigned long i; | |
1832a6d5 CM |
2822 | int ret; |
2823 | ||
2824 | mutex_lock(&root->fs_info->fs_mutex); | |
2825 | ret = btrfs_check_free_space(root, inode->i_size, 0); | |
2826 | mutex_unlock(&root->fs_info->fs_mutex); | |
2827 | if (ret) | |
2828 | return -ENOSPC; | |
86479a04 CM |
2829 | |
2830 | mutex_lock(&inode->i_mutex); | |
2831 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2832 | for (i = 0; i <= last_index; i++) { | |
2833 | if (i == ra_index) { | |
edbd8d4e CM |
2834 | ra_index = btrfs_force_ra(inode->i_mapping, |
2835 | &file->f_ra, | |
2836 | file, ra_index, last_index); | |
86479a04 CM |
2837 | } |
2838 | page = grab_cache_page(inode->i_mapping, i); | |
2839 | if (!page) | |
2840 | goto out_unlock; | |
2841 | if (!PageUptodate(page)) { | |
2842 | btrfs_readpage(NULL, page); | |
2843 | lock_page(page); | |
2844 | if (!PageUptodate(page)) { | |
2845 | unlock_page(page); | |
2846 | page_cache_release(page); | |
2847 | goto out_unlock; | |
2848 | } | |
2849 | } | |
35ebb934 | 2850 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2851 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2852 | ||
d1310b2e | 2853 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 2854 | set_extent_delalloc(io_tree, page_start, |
86479a04 | 2855 | page_end, GFP_NOFS); |
edbd8d4e | 2856 | |
d1310b2e | 2857 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
86479a04 CM |
2858 | set_page_dirty(page); |
2859 | unlock_page(page); | |
2860 | page_cache_release(page); | |
2861 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2862 | } | |
2863 | ||
2864 | out_unlock: | |
2865 | mutex_unlock(&inode->i_mutex); | |
2866 | return 0; | |
2867 | } | |
2868 | ||
edbd8d4e CM |
2869 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) |
2870 | { | |
2871 | u64 new_size; | |
2872 | u64 old_size; | |
2873 | struct btrfs_ioctl_vol_args *vol_args; | |
2874 | struct btrfs_trans_handle *trans; | |
2875 | char *sizestr; | |
2876 | int ret = 0; | |
2877 | int namelen; | |
2878 | int mod = 0; | |
2879 | ||
2880 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
2881 | ||
2882 | if (!vol_args) | |
2883 | return -ENOMEM; | |
2884 | ||
2885 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2886 | ret = -EFAULT; | |
2887 | goto out; | |
2888 | } | |
2889 | namelen = strlen(vol_args->name); | |
2890 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2891 | ret = -EINVAL; | |
2892 | goto out; | |
2893 | } | |
2894 | ||
2895 | sizestr = vol_args->name; | |
2896 | if (!strcmp(sizestr, "max")) | |
2897 | new_size = root->fs_info->sb->s_bdev->bd_inode->i_size; | |
2898 | else { | |
2899 | if (sizestr[0] == '-') { | |
2900 | mod = -1; | |
2901 | sizestr++; | |
2902 | } else if (sizestr[0] == '+') { | |
2903 | mod = 1; | |
2904 | sizestr++; | |
2905 | } | |
2906 | new_size = btrfs_parse_size(sizestr); | |
2907 | if (new_size == 0) { | |
2908 | ret = -EINVAL; | |
2909 | goto out; | |
2910 | } | |
2911 | } | |
2912 | ||
2913 | mutex_lock(&root->fs_info->fs_mutex); | |
2914 | old_size = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
2915 | ||
2916 | if (mod < 0) { | |
2917 | if (new_size > old_size) { | |
2918 | ret = -EINVAL; | |
2919 | goto out_unlock; | |
2920 | } | |
2921 | new_size = old_size - new_size; | |
2922 | } else if (mod > 0) { | |
2923 | new_size = old_size + new_size; | |
2924 | } | |
2925 | ||
2926 | if (new_size < 256 * 1024 * 1024) { | |
2927 | ret = -EINVAL; | |
2928 | goto out_unlock; | |
2929 | } | |
2930 | if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) { | |
2931 | ret = -EFBIG; | |
2932 | goto out_unlock; | |
2933 | } | |
f9ef6604 CM |
2934 | |
2935 | do_div(new_size, root->sectorsize); | |
2936 | new_size *= root->sectorsize; | |
edbd8d4e CM |
2937 | |
2938 | printk("new size is %Lu\n", new_size); | |
2939 | if (new_size > old_size) { | |
2940 | trans = btrfs_start_transaction(root, 1); | |
2941 | ret = btrfs_grow_extent_tree(trans, root, new_size); | |
2942 | btrfs_commit_transaction(trans, root); | |
2943 | } else { | |
2944 | ret = btrfs_shrink_extent_tree(root, new_size); | |
2945 | } | |
2946 | ||
2947 | out_unlock: | |
2948 | mutex_unlock(&root->fs_info->fs_mutex); | |
2949 | out: | |
2950 | kfree(vol_args); | |
2951 | return ret; | |
2952 | } | |
2953 | ||
4313b399 CM |
2954 | static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root, |
2955 | void __user *arg) | |
39279cc3 | 2956 | { |
4aec2b52 | 2957 | struct btrfs_ioctl_vol_args *vol_args; |
39279cc3 | 2958 | struct btrfs_dir_item *di; |
39279cc3 CM |
2959 | struct btrfs_path *path; |
2960 | u64 root_dirid; | |
4aec2b52 CM |
2961 | int namelen; |
2962 | int ret; | |
39279cc3 | 2963 | |
4aec2b52 | 2964 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
5f39d397 | 2965 | |
4aec2b52 CM |
2966 | if (!vol_args) |
2967 | return -ENOMEM; | |
2968 | ||
2969 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2970 | ret = -EFAULT; | |
2971 | goto out; | |
2972 | } | |
2973 | ||
2974 | namelen = strlen(vol_args->name); | |
2975 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2976 | ret = -EINVAL; | |
2977 | goto out; | |
2978 | } | |
2979 | if (strchr(vol_args->name, '/')) { | |
2980 | ret = -EINVAL; | |
2981 | goto out; | |
2982 | } | |
d03581f4 CH |
2983 | |
2984 | path = btrfs_alloc_path(); | |
4aec2b52 CM |
2985 | if (!path) { |
2986 | ret = -ENOMEM; | |
2987 | goto out; | |
2988 | } | |
d03581f4 CH |
2989 | |
2990 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2991 | mutex_lock(&root->fs_info->fs_mutex); | |
2992 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2993 | path, root_dirid, | |
4aec2b52 | 2994 | vol_args->name, namelen, 0); |
d03581f4 CH |
2995 | mutex_unlock(&root->fs_info->fs_mutex); |
2996 | btrfs_free_path(path); | |
4aec2b52 CM |
2997 | |
2998 | if (di && !IS_ERR(di)) { | |
2999 | ret = -EEXIST; | |
3000 | goto out; | |
3001 | } | |
3002 | ||
3003 | if (IS_ERR(di)) { | |
3004 | ret = PTR_ERR(di); | |
3005 | goto out; | |
3006 | } | |
d03581f4 CH |
3007 | |
3008 | if (root == root->fs_info->tree_root) | |
4aec2b52 CM |
3009 | ret = create_subvol(root, vol_args->name, namelen); |
3010 | else | |
3011 | ret = create_snapshot(root, vol_args->name, namelen); | |
3012 | out: | |
3013 | kfree(vol_args); | |
3014 | return ret; | |
d03581f4 CH |
3015 | } |
3016 | ||
3017 | static int btrfs_ioctl_defrag(struct file *file) | |
3018 | { | |
6da6abae | 3019 | struct inode *inode = fdentry(file)->d_inode; |
d03581f4 CH |
3020 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3021 | ||
3022 | switch (inode->i_mode & S_IFMT) { | |
3023 | case S_IFDIR: | |
39279cc3 | 3024 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
3025 | btrfs_defrag_root(root, 0); |
3026 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 3027 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 3028 | break; |
d03581f4 CH |
3029 | case S_IFREG: |
3030 | btrfs_defrag_file(file); | |
3031 | break; | |
3032 | } | |
3033 | ||
3034 | return 0; | |
3035 | } | |
6702ed49 | 3036 | |
d03581f4 CH |
3037 | long btrfs_ioctl(struct file *file, unsigned int |
3038 | cmd, unsigned long arg) | |
3039 | { | |
6da6abae | 3040 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
d03581f4 CH |
3041 | |
3042 | switch (cmd) { | |
3043 | case BTRFS_IOC_SNAP_CREATE: | |
3044 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 3045 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 3046 | return btrfs_ioctl_defrag(file); |
edbd8d4e CM |
3047 | case BTRFS_IOC_RESIZE: |
3048 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
39279cc3 | 3049 | } |
d03581f4 CH |
3050 | |
3051 | return -ENOTTY; | |
39279cc3 CM |
3052 | } |
3053 | ||
39279cc3 CM |
3054 | /* |
3055 | * Called inside transaction, so use GFP_NOFS | |
3056 | */ | |
3057 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
3058 | { | |
3059 | struct btrfs_inode *ei; | |
3060 | ||
3061 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
3062 | if (!ei) | |
3063 | return NULL; | |
15ee9bc7 | 3064 | ei->last_trans = 0; |
dc17ff8f | 3065 | ei->ordered_trans = 0; |
39279cc3 CM |
3066 | return &ei->vfs_inode; |
3067 | } | |
3068 | ||
3069 | void btrfs_destroy_inode(struct inode *inode) | |
3070 | { | |
3071 | WARN_ON(!list_empty(&inode->i_dentry)); | |
3072 | WARN_ON(inode->i_data.nrpages); | |
3073 | ||
8c416c9e | 3074 | btrfs_drop_extent_cache(inode, 0, (u64)-1); |
39279cc3 CM |
3075 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
3076 | } | |
3077 | ||
44ec0b71 CM |
3078 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
3079 | static void init_once(struct kmem_cache * cachep, void *foo) | |
3080 | #else | |
39279cc3 CM |
3081 | static void init_once(void * foo, struct kmem_cache * cachep, |
3082 | unsigned long flags) | |
44ec0b71 | 3083 | #endif |
39279cc3 CM |
3084 | { |
3085 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
3086 | ||
3087 | inode_init_once(&ei->vfs_inode); | |
3088 | } | |
3089 | ||
3090 | void btrfs_destroy_cachep(void) | |
3091 | { | |
3092 | if (btrfs_inode_cachep) | |
3093 | kmem_cache_destroy(btrfs_inode_cachep); | |
3094 | if (btrfs_trans_handle_cachep) | |
3095 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
3096 | if (btrfs_transaction_cachep) | |
3097 | kmem_cache_destroy(btrfs_transaction_cachep); | |
3098 | if (btrfs_bit_radix_cachep) | |
3099 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
3100 | if (btrfs_path_cachep) | |
3101 | kmem_cache_destroy(btrfs_path_cachep); | |
3102 | } | |
3103 | ||
86479a04 | 3104 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 3105 | unsigned long extra_flags, |
44ec0b71 CM |
3106 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
3107 | void (*ctor)(struct kmem_cache *, void *) | |
3108 | #else | |
92fee66d | 3109 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
3110 | unsigned long) |
3111 | #endif | |
3112 | ) | |
92fee66d CM |
3113 | { |
3114 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
3115 | SLAB_MEM_SPREAD | extra_flags), ctor | |
3116 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
3117 | ,NULL | |
3118 | #endif | |
3119 | ); | |
3120 | } | |
3121 | ||
39279cc3 CM |
3122 | int btrfs_init_cachep(void) |
3123 | { | |
86479a04 | 3124 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
3125 | sizeof(struct btrfs_inode), |
3126 | 0, init_once); | |
39279cc3 CM |
3127 | if (!btrfs_inode_cachep) |
3128 | goto fail; | |
86479a04 CM |
3129 | btrfs_trans_handle_cachep = |
3130 | btrfs_cache_create("btrfs_trans_handle_cache", | |
3131 | sizeof(struct btrfs_trans_handle), | |
3132 | 0, NULL); | |
39279cc3 CM |
3133 | if (!btrfs_trans_handle_cachep) |
3134 | goto fail; | |
86479a04 | 3135 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 3136 | sizeof(struct btrfs_transaction), |
92fee66d | 3137 | 0, NULL); |
39279cc3 CM |
3138 | if (!btrfs_transaction_cachep) |
3139 | goto fail; | |
86479a04 | 3140 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 3141 | sizeof(struct btrfs_path), |
92fee66d | 3142 | 0, NULL); |
39279cc3 CM |
3143 | if (!btrfs_path_cachep) |
3144 | goto fail; | |
86479a04 | 3145 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 3146 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
3147 | if (!btrfs_bit_radix_cachep) |
3148 | goto fail; | |
3149 | return 0; | |
3150 | fail: | |
3151 | btrfs_destroy_cachep(); | |
3152 | return -ENOMEM; | |
3153 | } | |
3154 | ||
3155 | static int btrfs_getattr(struct vfsmount *mnt, | |
3156 | struct dentry *dentry, struct kstat *stat) | |
3157 | { | |
3158 | struct inode *inode = dentry->d_inode; | |
3159 | generic_fillattr(inode, stat); | |
d6667462 | 3160 | stat->blksize = PAGE_CACHE_SIZE; |
9069218d | 3161 | stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9); |
39279cc3 CM |
3162 | return 0; |
3163 | } | |
3164 | ||
3165 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
3166 | struct inode * new_dir,struct dentry *new_dentry) | |
3167 | { | |
3168 | struct btrfs_trans_handle *trans; | |
3169 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
3170 | struct inode *new_inode = new_dentry->d_inode; | |
3171 | struct inode *old_inode = old_dentry->d_inode; | |
3172 | struct timespec ctime = CURRENT_TIME; | |
3173 | struct btrfs_path *path; | |
39279cc3 CM |
3174 | int ret; |
3175 | ||
3176 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
3177 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
3178 | return -ENOTEMPTY; | |
3179 | } | |
5f39d397 | 3180 | |
39279cc3 | 3181 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
3182 | ret = btrfs_check_free_space(root, 1, 0); |
3183 | if (ret) | |
3184 | goto out_unlock; | |
3185 | ||
39279cc3 | 3186 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 3187 | |
39279cc3 CM |
3188 | btrfs_set_trans_block_group(trans, new_dir); |
3189 | path = btrfs_alloc_path(); | |
3190 | if (!path) { | |
3191 | ret = -ENOMEM; | |
3192 | goto out_fail; | |
3193 | } | |
3194 | ||
3195 | old_dentry->d_inode->i_nlink++; | |
3196 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
3197 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
3198 | old_inode->i_ctime = ctime; | |
5f39d397 | 3199 | |
39279cc3 CM |
3200 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
3201 | if (ret) | |
3202 | goto out_fail; | |
3203 | ||
3204 | if (new_inode) { | |
3205 | new_inode->i_ctime = CURRENT_TIME; | |
3206 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
3207 | if (ret) | |
3208 | goto out_fail; | |
39279cc3 | 3209 | } |
9c58309d | 3210 | ret = btrfs_add_link(trans, new_dentry, old_inode, 1); |
39279cc3 CM |
3211 | if (ret) |
3212 | goto out_fail; | |
3213 | ||
3214 | out_fail: | |
3215 | btrfs_free_path(path); | |
3216 | btrfs_end_transaction(trans, root); | |
1832a6d5 | 3217 | out_unlock: |
39279cc3 CM |
3218 | mutex_unlock(&root->fs_info->fs_mutex); |
3219 | return ret; | |
3220 | } | |
3221 | ||
3222 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
3223 | const char *symname) | |
3224 | { | |
3225 | struct btrfs_trans_handle *trans; | |
3226 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
3227 | struct btrfs_path *path; | |
3228 | struct btrfs_key key; | |
1832a6d5 | 3229 | struct inode *inode = NULL; |
39279cc3 CM |
3230 | int err; |
3231 | int drop_inode = 0; | |
3232 | u64 objectid; | |
3233 | int name_len; | |
3234 | int datasize; | |
5f39d397 | 3235 | unsigned long ptr; |
39279cc3 | 3236 | struct btrfs_file_extent_item *ei; |
5f39d397 | 3237 | struct extent_buffer *leaf; |
1832a6d5 | 3238 | unsigned long nr = 0; |
39279cc3 CM |
3239 | |
3240 | name_len = strlen(symname) + 1; | |
3241 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
3242 | return -ENAMETOOLONG; | |
1832a6d5 | 3243 | |
39279cc3 | 3244 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
3245 | err = btrfs_check_free_space(root, 1, 0); |
3246 | if (err) | |
3247 | goto out_fail; | |
3248 | ||
39279cc3 CM |
3249 | trans = btrfs_start_transaction(root, 1); |
3250 | btrfs_set_trans_block_group(trans, dir); | |
3251 | ||
3252 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
3253 | if (err) { | |
3254 | err = -ENOSPC; | |
3255 | goto out_unlock; | |
3256 | } | |
3257 | ||
9c58309d CM |
3258 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
3259 | dentry->d_name.len, | |
3260 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
3261 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); |
3262 | err = PTR_ERR(inode); | |
3263 | if (IS_ERR(inode)) | |
3264 | goto out_unlock; | |
3265 | ||
3266 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 3267 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
3268 | if (err) |
3269 | drop_inode = 1; | |
3270 | else { | |
3271 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 3272 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
3273 | inode->i_fop = &btrfs_file_operations; |
3274 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
3275 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
3276 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 3277 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
3278 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
3279 | inode->i_mapping, GFP_NOFS); | |
9069218d | 3280 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e | 3281 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
3282 | } |
3283 | dir->i_sb->s_dirt = 1; | |
3284 | btrfs_update_inode_block_group(trans, inode); | |
3285 | btrfs_update_inode_block_group(trans, dir); | |
3286 | if (drop_inode) | |
3287 | goto out_unlock; | |
3288 | ||
3289 | path = btrfs_alloc_path(); | |
3290 | BUG_ON(!path); | |
3291 | key.objectid = inode->i_ino; | |
3292 | key.offset = 0; | |
39279cc3 CM |
3293 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
3294 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
3295 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
3296 | datasize); | |
54aa1f4d CM |
3297 | if (err) { |
3298 | drop_inode = 1; | |
3299 | goto out_unlock; | |
3300 | } | |
5f39d397 CM |
3301 | leaf = path->nodes[0]; |
3302 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
3303 | struct btrfs_file_extent_item); | |
3304 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
3305 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
3306 | BTRFS_FILE_EXTENT_INLINE); |
3307 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
3308 | write_extent_buffer(leaf, symname, ptr, name_len); |
3309 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 3310 | btrfs_free_path(path); |
5f39d397 | 3311 | |
39279cc3 CM |
3312 | inode->i_op = &btrfs_symlink_inode_operations; |
3313 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 3314 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 3315 | inode->i_size = name_len - 1; |
54aa1f4d CM |
3316 | err = btrfs_update_inode(trans, root, inode); |
3317 | if (err) | |
3318 | drop_inode = 1; | |
39279cc3 CM |
3319 | |
3320 | out_unlock: | |
d3c2fdcf | 3321 | nr = trans->blocks_used; |
39279cc3 | 3322 | btrfs_end_transaction(trans, root); |
1832a6d5 | 3323 | out_fail: |
39279cc3 | 3324 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 CM |
3325 | if (drop_inode) { |
3326 | inode_dec_link_count(inode); | |
3327 | iput(inode); | |
3328 | } | |
d3c2fdcf | 3329 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 3330 | btrfs_throttle(root); |
39279cc3 CM |
3331 | return err; |
3332 | } | |
16432985 | 3333 | |
fdebe2bd Y |
3334 | static int btrfs_permission(struct inode *inode, int mask, |
3335 | struct nameidata *nd) | |
3336 | { | |
3337 | if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE)) | |
3338 | return -EACCES; | |
3339 | return generic_permission(inode, mask, NULL); | |
3340 | } | |
39279cc3 CM |
3341 | |
3342 | static struct inode_operations btrfs_dir_inode_operations = { | |
3343 | .lookup = btrfs_lookup, | |
3344 | .create = btrfs_create, | |
3345 | .unlink = btrfs_unlink, | |
3346 | .link = btrfs_link, | |
3347 | .mkdir = btrfs_mkdir, | |
3348 | .rmdir = btrfs_rmdir, | |
3349 | .rename = btrfs_rename, | |
3350 | .symlink = btrfs_symlink, | |
3351 | .setattr = btrfs_setattr, | |
618e21d5 | 3352 | .mknod = btrfs_mknod, |
5103e947 JB |
3353 | .setxattr = generic_setxattr, |
3354 | .getxattr = generic_getxattr, | |
3355 | .listxattr = btrfs_listxattr, | |
3356 | .removexattr = generic_removexattr, | |
fdebe2bd | 3357 | .permission = btrfs_permission, |
39279cc3 | 3358 | }; |
39279cc3 CM |
3359 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
3360 | .lookup = btrfs_lookup, | |
fdebe2bd | 3361 | .permission = btrfs_permission, |
39279cc3 | 3362 | }; |
39279cc3 CM |
3363 | static struct file_operations btrfs_dir_file_operations = { |
3364 | .llseek = generic_file_llseek, | |
3365 | .read = generic_read_dir, | |
3366 | .readdir = btrfs_readdir, | |
34287aa3 | 3367 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 3368 | #ifdef CONFIG_COMPAT |
34287aa3 | 3369 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
3370 | #endif |
3371 | }; | |
3372 | ||
d1310b2e | 3373 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 3374 | .fill_delalloc = run_delalloc_range, |
065631f6 | 3375 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 3376 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac CM |
3377 | .readpage_io_hook = btrfs_readpage_io_hook, |
3378 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
7e38326f | 3379 | .readpage_io_failed_hook = btrfs_readpage_io_failed_hook, |
b0c68f8b CM |
3380 | .set_bit_hook = btrfs_set_bit_hook, |
3381 | .clear_bit_hook = btrfs_clear_bit_hook, | |
07157aac CM |
3382 | }; |
3383 | ||
39279cc3 CM |
3384 | static struct address_space_operations btrfs_aops = { |
3385 | .readpage = btrfs_readpage, | |
3386 | .writepage = btrfs_writepage, | |
b293f02e | 3387 | .writepages = btrfs_writepages, |
3ab2fb5a | 3388 | .readpages = btrfs_readpages, |
39279cc3 | 3389 | .sync_page = block_sync_page, |
39279cc3 | 3390 | .bmap = btrfs_bmap, |
16432985 | 3391 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
3392 | .invalidatepage = btrfs_invalidatepage, |
3393 | .releasepage = btrfs_releasepage, | |
3394 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
3395 | }; |
3396 | ||
3397 | static struct address_space_operations btrfs_symlink_aops = { | |
3398 | .readpage = btrfs_readpage, | |
3399 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
3400 | .invalidatepage = btrfs_invalidatepage, |
3401 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
3402 | }; |
3403 | ||
3404 | static struct inode_operations btrfs_file_inode_operations = { | |
3405 | .truncate = btrfs_truncate, | |
3406 | .getattr = btrfs_getattr, | |
3407 | .setattr = btrfs_setattr, | |
5103e947 JB |
3408 | .setxattr = generic_setxattr, |
3409 | .getxattr = generic_getxattr, | |
3410 | .listxattr = btrfs_listxattr, | |
3411 | .removexattr = generic_removexattr, | |
fdebe2bd | 3412 | .permission = btrfs_permission, |
39279cc3 | 3413 | }; |
618e21d5 JB |
3414 | static struct inode_operations btrfs_special_inode_operations = { |
3415 | .getattr = btrfs_getattr, | |
3416 | .setattr = btrfs_setattr, | |
fdebe2bd | 3417 | .permission = btrfs_permission, |
618e21d5 | 3418 | }; |
39279cc3 CM |
3419 | static struct inode_operations btrfs_symlink_inode_operations = { |
3420 | .readlink = generic_readlink, | |
3421 | .follow_link = page_follow_link_light, | |
3422 | .put_link = page_put_link, | |
fdebe2bd | 3423 | .permission = btrfs_permission, |
39279cc3 | 3424 | }; |