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