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