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Btrfs: Invalidate dcache entry after creating snapshot and
[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/kernel.h>
20 #include <linux/bio.h>
21 #include <linux/buffer_head.h>
22 #include <linux/file.h>
23 #include <linux/fs.h>
24 #include <linux/pagemap.h>
25 #include <linux/highmem.h>
26 #include <linux/time.h>
27 #include <linux/init.h>
28 #include <linux/string.h>
29 #include <linux/smp_lock.h>
30 #include <linux/backing-dev.h>
31 #include <linux/mpage.h>
32 #include <linux/swap.h>
33 #include <linux/writeback.h>
34 #include <linux/statfs.h>
35 #include <linux/compat.h>
36 #include <linux/bit_spinlock.h>
37 #include <linux/version.h>
38 #include <linux/xattr.h>
39 #include "ctree.h"
40 #include "disk-io.h"
41 #include "transaction.h"
42 #include "btrfs_inode.h"
43 #include "ioctl.h"
44 #include "print-tree.h"
45 #include "volumes.h"
46
47 struct btrfs_iget_args {
48 u64 ino;
49 struct btrfs_root *root;
50 };
51
52 static struct inode_operations btrfs_dir_inode_operations;
53 static struct inode_operations btrfs_symlink_inode_operations;
54 static struct inode_operations btrfs_dir_ro_inode_operations;
55 static struct inode_operations btrfs_special_inode_operations;
56 static struct inode_operations btrfs_file_inode_operations;
57 static struct address_space_operations btrfs_aops;
58 static struct address_space_operations btrfs_symlink_aops;
59 static struct file_operations btrfs_dir_file_operations;
60 static struct extent_io_ops btrfs_extent_io_ops;
61
62 static struct kmem_cache *btrfs_inode_cachep;
63 struct kmem_cache *btrfs_trans_handle_cachep;
64 struct kmem_cache *btrfs_transaction_cachep;
65 struct kmem_cache *btrfs_bit_radix_cachep;
66 struct kmem_cache *btrfs_path_cachep;
67
68 #define S_SHIFT 12
69 static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
70 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
71 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
72 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
73 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
74 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
75 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
76 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
77 };
78
79 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
80 int for_del)
81 {
82 u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
83 u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
84 u64 thresh;
85 unsigned long flags;
86 int ret = 0;
87
88 if (for_del)
89 thresh = total * 90;
90 else
91 thresh = total * 85;
92
93 do_div(thresh, 100);
94
95 spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
96 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
97 ret = -ENOSPC;
98 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
99 return ret;
100 }
101
102 static int cow_file_range(struct inode *inode, u64 start, u64 end)
103 {
104 struct btrfs_root *root = BTRFS_I(inode)->root;
105 struct btrfs_trans_handle *trans;
106 u64 alloc_hint = 0;
107 u64 num_bytes;
108 u64 cur_alloc_size;
109 u64 blocksize = root->sectorsize;
110 u64 orig_start = start;
111 u64 orig_num_bytes;
112 struct btrfs_key ins;
113 int ret;
114
115 trans = btrfs_start_transaction(root, 1);
116 BUG_ON(!trans);
117 btrfs_set_trans_block_group(trans, inode);
118
119 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
120 num_bytes = max(blocksize, num_bytes);
121 ret = btrfs_drop_extents(trans, root, inode,
122 start, start + num_bytes, start, &alloc_hint);
123 orig_num_bytes = num_bytes;
124
125 if (alloc_hint == EXTENT_MAP_INLINE)
126 goto out;
127
128 BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy));
129
130 while(num_bytes > 0) {
131 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
132 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
133 root->sectorsize,
134 root->root_key.objectid,
135 trans->transid,
136 inode->i_ino, start, 0,
137 alloc_hint, (u64)-1, &ins, 1);
138 if (ret) {
139 WARN_ON(1);
140 goto out;
141 }
142 cur_alloc_size = ins.offset;
143 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
144 start, ins.objectid, ins.offset,
145 ins.offset, 0);
146 inode->i_blocks += ins.offset >> 9;
147 btrfs_check_file(root, inode);
148 if (num_bytes < cur_alloc_size) {
149 printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes,
150 cur_alloc_size);
151 break;
152 }
153 num_bytes -= cur_alloc_size;
154 alloc_hint = ins.objectid + ins.offset;
155 start += cur_alloc_size;
156 }
157 btrfs_drop_extent_cache(inode, orig_start,
158 orig_start + orig_num_bytes - 1);
159 btrfs_add_ordered_inode(inode);
160 btrfs_update_inode(trans, root, inode);
161 out:
162 btrfs_end_transaction(trans, root);
163 return ret;
164 }
165
166 static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
167 {
168 u64 extent_start;
169 u64 extent_end;
170 u64 bytenr;
171 u64 cow_end;
172 u64 loops = 0;
173 u64 total_fs_bytes;
174 struct btrfs_root *root = BTRFS_I(inode)->root;
175 struct btrfs_block_group_cache *block_group;
176 struct extent_buffer *leaf;
177 int found_type;
178 struct btrfs_path *path;
179 struct btrfs_file_extent_item *item;
180 int ret;
181 int err;
182 struct btrfs_key found_key;
183
184 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
185 path = btrfs_alloc_path();
186 BUG_ON(!path);
187 again:
188 ret = btrfs_lookup_file_extent(NULL, root, path,
189 inode->i_ino, start, 0);
190 if (ret < 0) {
191 btrfs_free_path(path);
192 return ret;
193 }
194
195 cow_end = end;
196 if (ret != 0) {
197 if (path->slots[0] == 0)
198 goto not_found;
199 path->slots[0]--;
200 }
201
202 leaf = path->nodes[0];
203 item = btrfs_item_ptr(leaf, path->slots[0],
204 struct btrfs_file_extent_item);
205
206 /* are we inside the extent that was found? */
207 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
208 found_type = btrfs_key_type(&found_key);
209 if (found_key.objectid != inode->i_ino ||
210 found_type != BTRFS_EXTENT_DATA_KEY)
211 goto not_found;
212
213 found_type = btrfs_file_extent_type(leaf, item);
214 extent_start = found_key.offset;
215 if (found_type == BTRFS_FILE_EXTENT_REG) {
216 u64 extent_num_bytes;
217
218 extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
219 extent_end = extent_start + extent_num_bytes;
220 err = 0;
221
222 if (loops && start != extent_start)
223 goto not_found;
224
225 if (start < extent_start || start >= extent_end)
226 goto not_found;
227
228 cow_end = min(end, extent_end - 1);
229 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
230 if (bytenr == 0)
231 goto not_found;
232
233 if (btrfs_count_snapshots_in_path(root, path, inode->i_ino,
234 bytenr) != 1) {
235 goto not_found;
236 }
237
238 /*
239 * we may be called by the resizer, make sure we're inside
240 * the limits of the FS
241 */
242 block_group = btrfs_lookup_block_group(root->fs_info,
243 bytenr);
244 if (!block_group || block_group->ro)
245 goto not_found;
246
247 start = extent_end;
248 } else {
249 goto not_found;
250 }
251 loop:
252 if (start > end) {
253 btrfs_free_path(path);
254 return 0;
255 }
256 btrfs_release_path(root, path);
257 loops++;
258 goto again;
259
260 not_found:
261 cow_file_range(inode, start, end);
262 start = end + 1;
263 goto loop;
264 }
265
266 static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
267 {
268 struct btrfs_root *root = BTRFS_I(inode)->root;
269 int ret;
270 mutex_lock(&root->fs_info->fs_mutex);
271 if (btrfs_test_opt(root, NODATACOW) ||
272 btrfs_test_flag(inode, NODATACOW))
273 ret = run_delalloc_nocow(inode, start, end);
274 else
275 ret = cow_file_range(inode, start, end);
276
277 mutex_unlock(&root->fs_info->fs_mutex);
278 return ret;
279 }
280
281 int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
282 unsigned long old, unsigned long bits)
283 {
284 unsigned long flags;
285 if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
286 struct btrfs_root *root = BTRFS_I(inode)->root;
287 spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
288 BTRFS_I(inode)->delalloc_bytes += end - start + 1;
289 root->fs_info->delalloc_bytes += end - start + 1;
290 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
291 }
292 return 0;
293 }
294
295 int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
296 unsigned long old, unsigned long bits)
297 {
298 if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
299 struct btrfs_root *root = BTRFS_I(inode)->root;
300 unsigned long flags;
301
302 spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
303 if (end - start + 1 > root->fs_info->delalloc_bytes) {
304 printk("warning: delalloc account %Lu %Lu\n",
305 end - start + 1, root->fs_info->delalloc_bytes);
306 root->fs_info->delalloc_bytes = 0;
307 BTRFS_I(inode)->delalloc_bytes = 0;
308 } else {
309 root->fs_info->delalloc_bytes -= end - start + 1;
310 BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
311 }
312 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
313 }
314 return 0;
315 }
316
317 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
318 size_t size, struct bio *bio)
319 {
320 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
321 struct btrfs_mapping_tree *map_tree;
322 u64 logical = bio->bi_sector << 9;
323 u64 length = 0;
324 u64 map_length;
325 int ret;
326
327 length = bio->bi_size;
328 map_tree = &root->fs_info->mapping_tree;
329 map_length = length;
330 ret = btrfs_map_block(map_tree, READ, logical,
331 &map_length, NULL, 0);
332
333 if (map_length < length + size) {
334 return 1;
335 }
336 return 0;
337 }
338
339 int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
340 int mirror_num)
341 {
342 struct btrfs_root *root = BTRFS_I(inode)->root;
343 struct btrfs_trans_handle *trans;
344 int ret = 0;
345 char *sums = NULL;
346
347 ret = btrfs_csum_one_bio(root, bio, &sums);
348 BUG_ON(ret);
349
350 mutex_lock(&root->fs_info->fs_mutex);
351 trans = btrfs_start_transaction(root, 1);
352
353 btrfs_set_trans_block_group(trans, inode);
354 btrfs_csum_file_blocks(trans, root, inode, bio, sums);
355
356 ret = btrfs_end_transaction(trans, root);
357 BUG_ON(ret);
358 mutex_unlock(&root->fs_info->fs_mutex);
359
360 kfree(sums);
361
362 return btrfs_map_bio(root, rw, bio, mirror_num);
363 }
364
365 int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
366 int mirror_num)
367 {
368 struct btrfs_root *root = BTRFS_I(inode)->root;
369 int ret = 0;
370
371 if (!(rw & (1 << BIO_RW))) {
372 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
373 BUG_ON(ret);
374 goto mapit;
375 }
376
377 if (btrfs_test_opt(root, NODATASUM) ||
378 btrfs_test_flag(inode, NODATASUM)) {
379 goto mapit;
380 }
381
382 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
383 inode, rw, bio, mirror_num,
384 __btrfs_submit_bio_hook);
385 mapit:
386 return btrfs_map_bio(root, rw, bio, mirror_num);
387 }
388
389 int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
390 {
391 int ret = 0;
392 struct inode *inode = page->mapping->host;
393 struct btrfs_root *root = BTRFS_I(inode)->root;
394 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
395 struct btrfs_csum_item *item;
396 struct btrfs_path *path = NULL;
397 u32 csum;
398
399 if (btrfs_test_opt(root, NODATASUM) ||
400 btrfs_test_flag(inode, NODATASUM))
401 return 0;
402
403 mutex_lock(&root->fs_info->fs_mutex);
404 path = btrfs_alloc_path();
405 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
406 if (IS_ERR(item)) {
407 ret = PTR_ERR(item);
408 /* a csum that isn't present is a preallocated region. */
409 if (ret == -ENOENT || ret == -EFBIG)
410 ret = 0;
411 csum = 0;
412 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
413 goto out;
414 }
415 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
416 BTRFS_CRC32_SIZE);
417 set_state_private(io_tree, start, csum);
418 out:
419 if (path)
420 btrfs_free_path(path);
421 mutex_unlock(&root->fs_info->fs_mutex);
422 return ret;
423 }
424
425 struct io_failure_record {
426 struct page *page;
427 u64 start;
428 u64 len;
429 u64 logical;
430 int last_mirror;
431 };
432
433 int btrfs_io_failed_hook(struct bio *failed_bio,
434 struct page *page, u64 start, u64 end,
435 struct extent_state *state)
436 {
437 struct io_failure_record *failrec = NULL;
438 u64 private;
439 struct extent_map *em;
440 struct inode *inode = page->mapping->host;
441 struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
442 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
443 struct bio *bio;
444 int num_copies;
445 int ret;
446 int rw;
447 u64 logical;
448
449 ret = get_state_private(failure_tree, start, &private);
450 if (ret) {
451 failrec = kmalloc(sizeof(*failrec), GFP_NOFS);
452 if (!failrec)
453 return -ENOMEM;
454 failrec->start = start;
455 failrec->len = end - start + 1;
456 failrec->last_mirror = 0;
457
458 spin_lock(&em_tree->lock);
459 em = lookup_extent_mapping(em_tree, start, failrec->len);
460 if (em->start > start || em->start + em->len < start) {
461 free_extent_map(em);
462 em = NULL;
463 }
464 spin_unlock(&em_tree->lock);
465
466 if (!em || IS_ERR(em)) {
467 kfree(failrec);
468 return -EIO;
469 }
470 logical = start - em->start;
471 logical = em->block_start + logical;
472 failrec->logical = logical;
473 free_extent_map(em);
474 set_extent_bits(failure_tree, start, end, EXTENT_LOCKED |
475 EXTENT_DIRTY, GFP_NOFS);
476 set_state_private(failure_tree, start,
477 (u64)(unsigned long)failrec);
478 } else {
479 failrec = (struct io_failure_record *)(unsigned long)private;
480 }
481 num_copies = btrfs_num_copies(
482 &BTRFS_I(inode)->root->fs_info->mapping_tree,
483 failrec->logical, failrec->len);
484 failrec->last_mirror++;
485 if (!state) {
486 spin_lock_irq(&BTRFS_I(inode)->io_tree.lock);
487 state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree,
488 failrec->start,
489 EXTENT_LOCKED);
490 if (state && state->start != failrec->start)
491 state = NULL;
492 spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock);
493 }
494 if (!state || failrec->last_mirror > num_copies) {
495 set_state_private(failure_tree, failrec->start, 0);
496 clear_extent_bits(failure_tree, failrec->start,
497 failrec->start + failrec->len - 1,
498 EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
499 kfree(failrec);
500 return -EIO;
501 }
502 bio = bio_alloc(GFP_NOFS, 1);
503 bio->bi_private = state;
504 bio->bi_end_io = failed_bio->bi_end_io;
505 bio->bi_sector = failrec->logical >> 9;
506 bio->bi_bdev = failed_bio->bi_bdev;
507 bio->bi_size = 0;
508 bio_add_page(bio, page, failrec->len, start - page_offset(page));
509 if (failed_bio->bi_rw & (1 << BIO_RW))
510 rw = WRITE;
511 else
512 rw = READ;
513
514 BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio,
515 failrec->last_mirror);
516 return 0;
517 }
518
519 int btrfs_clean_io_failures(struct inode *inode, u64 start)
520 {
521 u64 private;
522 u64 private_failure;
523 struct io_failure_record *failure;
524 int ret;
525
526 private = 0;
527 if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private,
528 (u64)-1, 1, EXTENT_DIRTY)) {
529 ret = get_state_private(&BTRFS_I(inode)->io_failure_tree,
530 start, &private_failure);
531 if (ret == 0) {
532 failure = (struct io_failure_record *)(unsigned long)
533 private_failure;
534 set_state_private(&BTRFS_I(inode)->io_failure_tree,
535 failure->start, 0);
536 clear_extent_bits(&BTRFS_I(inode)->io_failure_tree,
537 failure->start,
538 failure->start + failure->len - 1,
539 EXTENT_DIRTY | EXTENT_LOCKED,
540 GFP_NOFS);
541 kfree(failure);
542 }
543 }
544 return 0;
545 }
546
547 int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
548 struct extent_state *state)
549 {
550 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
551 struct inode *inode = page->mapping->host;
552 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
553 char *kaddr;
554 u64 private = ~(u32)0;
555 int ret;
556 struct btrfs_root *root = BTRFS_I(inode)->root;
557 u32 csum = ~(u32)0;
558 unsigned long flags;
559
560 if (btrfs_test_opt(root, NODATASUM) ||
561 btrfs_test_flag(inode, NODATASUM))
562 return 0;
563 if (state && state->start == start) {
564 private = state->private;
565 ret = 0;
566 } else {
567 ret = get_state_private(io_tree, start, &private);
568 }
569 local_irq_save(flags);
570 kaddr = kmap_atomic(page, KM_IRQ0);
571 if (ret) {
572 goto zeroit;
573 }
574 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
575 btrfs_csum_final(csum, (char *)&csum);
576 if (csum != private) {
577 goto zeroit;
578 }
579 kunmap_atomic(kaddr, KM_IRQ0);
580 local_irq_restore(flags);
581
582 /* if the io failure tree for this inode is non-empty,
583 * check to see if we've recovered from a failed IO
584 */
585 btrfs_clean_io_failures(inode, start);
586 return 0;
587
588 zeroit:
589 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
590 page->mapping->host->i_ino, (unsigned long long)start, csum,
591 private);
592 memset(kaddr + offset, 1, end - start + 1);
593 flush_dcache_page(page);
594 kunmap_atomic(kaddr, KM_IRQ0);
595 local_irq_restore(flags);
596 if (private == 0)
597 return 0;
598 return -EIO;
599 }
600
601 void btrfs_read_locked_inode(struct inode *inode)
602 {
603 struct btrfs_path *path;
604 struct extent_buffer *leaf;
605 struct btrfs_inode_item *inode_item;
606 struct btrfs_timespec *tspec;
607 struct btrfs_root *root = BTRFS_I(inode)->root;
608 struct btrfs_key location;
609 u64 alloc_group_block;
610 u32 rdev;
611 int ret;
612
613 path = btrfs_alloc_path();
614 BUG_ON(!path);
615 mutex_lock(&root->fs_info->fs_mutex);
616 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
617
618 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
619 if (ret)
620 goto make_bad;
621
622 leaf = path->nodes[0];
623 inode_item = btrfs_item_ptr(leaf, path->slots[0],
624 struct btrfs_inode_item);
625
626 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
627 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
628 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
629 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
630 inode->i_size = btrfs_inode_size(leaf, inode_item);
631
632 tspec = btrfs_inode_atime(inode_item);
633 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
634 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
635
636 tspec = btrfs_inode_mtime(inode_item);
637 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
638 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
639
640 tspec = btrfs_inode_ctime(inode_item);
641 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
642 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
643
644 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
645 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
646 inode->i_rdev = 0;
647 rdev = btrfs_inode_rdev(leaf, inode_item);
648
649 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
650 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
651 alloc_group_block);
652 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
653 if (!BTRFS_I(inode)->block_group) {
654 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
655 NULL, 0,
656 BTRFS_BLOCK_GROUP_METADATA, 0);
657 }
658 btrfs_free_path(path);
659 inode_item = NULL;
660
661 mutex_unlock(&root->fs_info->fs_mutex);
662
663 switch (inode->i_mode & S_IFMT) {
664 case S_IFREG:
665 inode->i_mapping->a_ops = &btrfs_aops;
666 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
667 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
668 inode->i_fop = &btrfs_file_operations;
669 inode->i_op = &btrfs_file_inode_operations;
670 break;
671 case S_IFDIR:
672 inode->i_fop = &btrfs_dir_file_operations;
673 if (root == root->fs_info->tree_root)
674 inode->i_op = &btrfs_dir_ro_inode_operations;
675 else
676 inode->i_op = &btrfs_dir_inode_operations;
677 break;
678 case S_IFLNK:
679 inode->i_op = &btrfs_symlink_inode_operations;
680 inode->i_mapping->a_ops = &btrfs_symlink_aops;
681 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
682 break;
683 default:
684 init_special_inode(inode, inode->i_mode, rdev);
685 break;
686 }
687 return;
688
689 make_bad:
690 btrfs_release_path(root, path);
691 btrfs_free_path(path);
692 mutex_unlock(&root->fs_info->fs_mutex);
693 make_bad_inode(inode);
694 }
695
696 static void fill_inode_item(struct extent_buffer *leaf,
697 struct btrfs_inode_item *item,
698 struct inode *inode)
699 {
700 btrfs_set_inode_uid(leaf, item, inode->i_uid);
701 btrfs_set_inode_gid(leaf, item, inode->i_gid);
702 btrfs_set_inode_size(leaf, item, inode->i_size);
703 btrfs_set_inode_mode(leaf, item, inode->i_mode);
704 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
705
706 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
707 inode->i_atime.tv_sec);
708 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
709 inode->i_atime.tv_nsec);
710
711 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
712 inode->i_mtime.tv_sec);
713 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
714 inode->i_mtime.tv_nsec);
715
716 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
717 inode->i_ctime.tv_sec);
718 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
719 inode->i_ctime.tv_nsec);
720
721 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
722 btrfs_set_inode_generation(leaf, item, inode->i_generation);
723 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
724 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
725 btrfs_set_inode_block_group(leaf, item,
726 BTRFS_I(inode)->block_group->key.objectid);
727 }
728
729 int btrfs_update_inode(struct btrfs_trans_handle *trans,
730 struct btrfs_root *root,
731 struct inode *inode)
732 {
733 struct btrfs_inode_item *inode_item;
734 struct btrfs_path *path;
735 struct extent_buffer *leaf;
736 int ret;
737
738 path = btrfs_alloc_path();
739 BUG_ON(!path);
740 ret = btrfs_lookup_inode(trans, root, path,
741 &BTRFS_I(inode)->location, 1);
742 if (ret) {
743 if (ret > 0)
744 ret = -ENOENT;
745 goto failed;
746 }
747
748 leaf = path->nodes[0];
749 inode_item = btrfs_item_ptr(leaf, path->slots[0],
750 struct btrfs_inode_item);
751
752 fill_inode_item(leaf, inode_item, inode);
753 btrfs_mark_buffer_dirty(leaf);
754 btrfs_set_inode_last_trans(trans, inode);
755 ret = 0;
756 failed:
757 btrfs_release_path(root, path);
758 btrfs_free_path(path);
759 return ret;
760 }
761
762
763 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
764 struct btrfs_root *root,
765 struct inode *dir,
766 struct dentry *dentry)
767 {
768 struct btrfs_path *path;
769 const char *name = dentry->d_name.name;
770 int name_len = dentry->d_name.len;
771 int ret = 0;
772 struct extent_buffer *leaf;
773 struct btrfs_dir_item *di;
774 struct btrfs_key key;
775
776 path = btrfs_alloc_path();
777 if (!path) {
778 ret = -ENOMEM;
779 goto err;
780 }
781
782 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
783 name, name_len, -1);
784 if (IS_ERR(di)) {
785 ret = PTR_ERR(di);
786 goto err;
787 }
788 if (!di) {
789 ret = -ENOENT;
790 goto err;
791 }
792 leaf = path->nodes[0];
793 btrfs_dir_item_key_to_cpu(leaf, di, &key);
794 ret = btrfs_delete_one_dir_name(trans, root, path, di);
795 if (ret)
796 goto err;
797 btrfs_release_path(root, path);
798
799 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
800 key.objectid, name, name_len, -1);
801 if (IS_ERR(di)) {
802 ret = PTR_ERR(di);
803 goto err;
804 }
805 if (!di) {
806 ret = -ENOENT;
807 goto err;
808 }
809 ret = btrfs_delete_one_dir_name(trans, root, path, di);
810
811 dentry->d_inode->i_ctime = dir->i_ctime;
812 ret = btrfs_del_inode_ref(trans, root, name, name_len,
813 dentry->d_inode->i_ino,
814 dentry->d_parent->d_inode->i_ino);
815 if (ret) {
816 printk("failed to delete reference to %.*s, "
817 "inode %lu parent %lu\n", name_len, name,
818 dentry->d_inode->i_ino,
819 dentry->d_parent->d_inode->i_ino);
820 }
821 err:
822 btrfs_free_path(path);
823 if (!ret) {
824 dir->i_size -= name_len * 2;
825 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
826 btrfs_update_inode(trans, root, dir);
827 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
828 dentry->d_inode->i_nlink--;
829 #else
830 drop_nlink(dentry->d_inode);
831 #endif
832 ret = btrfs_update_inode(trans, root, dentry->d_inode);
833 dir->i_sb->s_dirt = 1;
834 }
835 return ret;
836 }
837
838 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
839 {
840 struct btrfs_root *root;
841 struct btrfs_trans_handle *trans;
842 struct inode *inode = dentry->d_inode;
843 int ret;
844 unsigned long nr = 0;
845
846 root = BTRFS_I(dir)->root;
847 mutex_lock(&root->fs_info->fs_mutex);
848
849 ret = btrfs_check_free_space(root, 1, 1);
850 if (ret)
851 goto fail;
852
853 trans = btrfs_start_transaction(root, 1);
854
855 btrfs_set_trans_block_group(trans, dir);
856 ret = btrfs_unlink_trans(trans, root, dir, dentry);
857 nr = trans->blocks_used;
858
859 if (inode->i_nlink == 0) {
860 /* if the inode isn't linked anywhere,
861 * we don't need to worry about
862 * data=ordered
863 */
864 btrfs_del_ordered_inode(inode);
865 }
866
867 btrfs_end_transaction(trans, root);
868 fail:
869 mutex_unlock(&root->fs_info->fs_mutex);
870 btrfs_btree_balance_dirty(root, nr);
871 btrfs_throttle(root);
872 return ret;
873 }
874
875 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
876 {
877 struct inode *inode = dentry->d_inode;
878 int err = 0;
879 int ret;
880 struct btrfs_root *root = BTRFS_I(dir)->root;
881 struct btrfs_trans_handle *trans;
882 unsigned long nr = 0;
883
884 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
885 return -ENOTEMPTY;
886
887 mutex_lock(&root->fs_info->fs_mutex);
888 ret = btrfs_check_free_space(root, 1, 1);
889 if (ret)
890 goto fail;
891
892 trans = btrfs_start_transaction(root, 1);
893 btrfs_set_trans_block_group(trans, dir);
894
895 /* now the directory is empty */
896 err = btrfs_unlink_trans(trans, root, dir, dentry);
897 if (!err) {
898 inode->i_size = 0;
899 }
900
901 nr = trans->blocks_used;
902 ret = btrfs_end_transaction(trans, root);
903 fail:
904 mutex_unlock(&root->fs_info->fs_mutex);
905 btrfs_btree_balance_dirty(root, nr);
906 btrfs_throttle(root);
907
908 if (ret && !err)
909 err = ret;
910 return err;
911 }
912
913 /*
914 * this can truncate away extent items, csum items and directory items.
915 * It starts at a high offset and removes keys until it can't find
916 * any higher than i_size.
917 *
918 * csum items that cross the new i_size are truncated to the new size
919 * as well.
920 */
921 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
922 struct btrfs_root *root,
923 struct inode *inode,
924 u32 min_type)
925 {
926 int ret;
927 struct btrfs_path *path;
928 struct btrfs_key key;
929 struct btrfs_key found_key;
930 u32 found_type;
931 struct extent_buffer *leaf;
932 struct btrfs_file_extent_item *fi;
933 u64 extent_start = 0;
934 u64 extent_num_bytes = 0;
935 u64 item_end = 0;
936 u64 root_gen = 0;
937 u64 root_owner = 0;
938 int found_extent;
939 int del_item;
940 int pending_del_nr = 0;
941 int pending_del_slot = 0;
942 int extent_type = -1;
943 u64 mask = root->sectorsize - 1;
944
945 btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1);
946 path = btrfs_alloc_path();
947 path->reada = -1;
948 BUG_ON(!path);
949
950 /* FIXME, add redo link to tree so we don't leak on crash */
951 key.objectid = inode->i_ino;
952 key.offset = (u64)-1;
953 key.type = (u8)-1;
954
955 btrfs_init_path(path);
956 search_again:
957 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
958 if (ret < 0) {
959 goto error;
960 }
961 if (ret > 0) {
962 BUG_ON(path->slots[0] == 0);
963 path->slots[0]--;
964 }
965
966 while(1) {
967 fi = NULL;
968 leaf = path->nodes[0];
969 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
970 found_type = btrfs_key_type(&found_key);
971
972 if (found_key.objectid != inode->i_ino)
973 break;
974
975 if (found_type < min_type)
976 break;
977
978 item_end = found_key.offset;
979 if (found_type == BTRFS_EXTENT_DATA_KEY) {
980 fi = btrfs_item_ptr(leaf, path->slots[0],
981 struct btrfs_file_extent_item);
982 extent_type = btrfs_file_extent_type(leaf, fi);
983 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
984 item_end +=
985 btrfs_file_extent_num_bytes(leaf, fi);
986 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
987 struct btrfs_item *item = btrfs_item_nr(leaf,
988 path->slots[0]);
989 item_end += btrfs_file_extent_inline_len(leaf,
990 item);
991 }
992 item_end--;
993 }
994 if (found_type == BTRFS_CSUM_ITEM_KEY) {
995 ret = btrfs_csum_truncate(trans, root, path,
996 inode->i_size);
997 BUG_ON(ret);
998 }
999 if (item_end < inode->i_size) {
1000 if (found_type == BTRFS_DIR_ITEM_KEY) {
1001 found_type = BTRFS_INODE_ITEM_KEY;
1002 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
1003 found_type = BTRFS_CSUM_ITEM_KEY;
1004 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
1005 found_type = BTRFS_XATTR_ITEM_KEY;
1006 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
1007 found_type = BTRFS_INODE_REF_KEY;
1008 } else if (found_type) {
1009 found_type--;
1010 } else {
1011 break;
1012 }
1013 btrfs_set_key_type(&key, found_type);
1014 goto next;
1015 }
1016 if (found_key.offset >= inode->i_size)
1017 del_item = 1;
1018 else
1019 del_item = 0;
1020 found_extent = 0;
1021
1022 /* FIXME, shrink the extent if the ref count is only 1 */
1023 if (found_type != BTRFS_EXTENT_DATA_KEY)
1024 goto delete;
1025
1026 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
1027 u64 num_dec;
1028 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
1029 if (!del_item) {
1030 u64 orig_num_bytes =
1031 btrfs_file_extent_num_bytes(leaf, fi);
1032 extent_num_bytes = inode->i_size -
1033 found_key.offset + root->sectorsize - 1;
1034 extent_num_bytes = extent_num_bytes &
1035 ~((u64)root->sectorsize - 1);
1036 btrfs_set_file_extent_num_bytes(leaf, fi,
1037 extent_num_bytes);
1038 num_dec = (orig_num_bytes -
1039 extent_num_bytes);
1040 if (extent_start != 0)
1041 dec_i_blocks(inode, num_dec);
1042 btrfs_mark_buffer_dirty(leaf);
1043 } else {
1044 extent_num_bytes =
1045 btrfs_file_extent_disk_num_bytes(leaf,
1046 fi);
1047 /* FIXME blocksize != 4096 */
1048 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
1049 if (extent_start != 0) {
1050 found_extent = 1;
1051 dec_i_blocks(inode, num_dec);
1052 }
1053 root_gen = btrfs_header_generation(leaf);
1054 root_owner = btrfs_header_owner(leaf);
1055 }
1056 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1057 if (!del_item) {
1058 u32 newsize = inode->i_size - found_key.offset;
1059 dec_i_blocks(inode, item_end + 1 -
1060 found_key.offset - newsize);
1061 newsize =
1062 btrfs_file_extent_calc_inline_size(newsize);
1063 ret = btrfs_truncate_item(trans, root, path,
1064 newsize, 1);
1065 BUG_ON(ret);
1066 } else {
1067 dec_i_blocks(inode, item_end + 1 -
1068 found_key.offset);
1069 }
1070 }
1071 delete:
1072 if (del_item) {
1073 if (!pending_del_nr) {
1074 /* no pending yet, add ourselves */
1075 pending_del_slot = path->slots[0];
1076 pending_del_nr = 1;
1077 } else if (pending_del_nr &&
1078 path->slots[0] + 1 == pending_del_slot) {
1079 /* hop on the pending chunk */
1080 pending_del_nr++;
1081 pending_del_slot = path->slots[0];
1082 } else {
1083 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
1084 }
1085 } else {
1086 break;
1087 }
1088 if (found_extent) {
1089 ret = btrfs_free_extent(trans, root, extent_start,
1090 extent_num_bytes,
1091 root_owner,
1092 root_gen, inode->i_ino,
1093 found_key.offset, 0);
1094 BUG_ON(ret);
1095 }
1096 next:
1097 if (path->slots[0] == 0) {
1098 if (pending_del_nr)
1099 goto del_pending;
1100 btrfs_release_path(root, path);
1101 goto search_again;
1102 }
1103
1104 path->slots[0]--;
1105 if (pending_del_nr &&
1106 path->slots[0] + 1 != pending_del_slot) {
1107 struct btrfs_key debug;
1108 del_pending:
1109 btrfs_item_key_to_cpu(path->nodes[0], &debug,
1110 pending_del_slot);
1111 ret = btrfs_del_items(trans, root, path,
1112 pending_del_slot,
1113 pending_del_nr);
1114 BUG_ON(ret);
1115 pending_del_nr = 0;
1116 btrfs_release_path(root, path);
1117 goto search_again;
1118 }
1119 }
1120 ret = 0;
1121 error:
1122 if (pending_del_nr) {
1123 ret = btrfs_del_items(trans, root, path, pending_del_slot,
1124 pending_del_nr);
1125 }
1126 btrfs_release_path(root, path);
1127 btrfs_free_path(path);
1128 inode->i_sb->s_dirt = 1;
1129 return ret;
1130 }
1131
1132 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
1133 size_t zero_start)
1134 {
1135 char *kaddr;
1136 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1137 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1138 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1139 int ret = 0;
1140
1141 WARN_ON(!PageLocked(page));
1142 set_page_extent_mapped(page);
1143
1144 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
1145 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
1146 page_end, GFP_NOFS);
1147
1148 if (zero_start != PAGE_CACHE_SIZE) {
1149 kaddr = kmap(page);
1150 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
1151 flush_dcache_page(page);
1152 kunmap(page);
1153 }
1154 set_page_dirty(page);
1155 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
1156
1157 return ret;
1158 }
1159
1160 /*
1161 * taken from block_truncate_page, but does cow as it zeros out
1162 * any bytes left in the last page in the file.
1163 */
1164 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
1165 {
1166 struct inode *inode = mapping->host;
1167 struct btrfs_root *root = BTRFS_I(inode)->root;
1168 u32 blocksize = root->sectorsize;
1169 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1170 unsigned offset = from & (PAGE_CACHE_SIZE-1);
1171 struct page *page;
1172 int ret = 0;
1173 u64 page_start;
1174
1175 if ((offset & (blocksize - 1)) == 0)
1176 goto out;
1177
1178 ret = -ENOMEM;
1179 again:
1180 page = grab_cache_page(mapping, index);
1181 if (!page)
1182 goto out;
1183 if (!PageUptodate(page)) {
1184 ret = btrfs_readpage(NULL, page);
1185 lock_page(page);
1186 if (page->mapping != mapping) {
1187 unlock_page(page);
1188 page_cache_release(page);
1189 goto again;
1190 }
1191 if (!PageUptodate(page)) {
1192 ret = -EIO;
1193 goto out;
1194 }
1195 }
1196
1197 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1198 wait_on_page_writeback(page);
1199 ret = btrfs_cow_one_page(inode, page, offset);
1200
1201 unlock_page(page);
1202 page_cache_release(page);
1203 out:
1204 return ret;
1205 }
1206
1207 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
1208 {
1209 struct inode *inode = dentry->d_inode;
1210 int err;
1211
1212 err = inode_change_ok(inode, attr);
1213 if (err)
1214 return err;
1215
1216 if (S_ISREG(inode->i_mode) &&
1217 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
1218 struct btrfs_trans_handle *trans;
1219 struct btrfs_root *root = BTRFS_I(inode)->root;
1220 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1221
1222 u64 mask = root->sectorsize - 1;
1223 u64 hole_start = (inode->i_size + mask) & ~mask;
1224 u64 block_end = (attr->ia_size + mask) & ~mask;
1225 u64 hole_size;
1226 u64 alloc_hint = 0;
1227
1228 if (attr->ia_size <= hole_start)
1229 goto out;
1230
1231 mutex_lock(&root->fs_info->fs_mutex);
1232 err = btrfs_check_free_space(root, 1, 0);
1233 mutex_unlock(&root->fs_info->fs_mutex);
1234 if (err)
1235 goto fail;
1236
1237 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1238
1239 lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
1240 hole_size = block_end - hole_start;
1241
1242 mutex_lock(&root->fs_info->fs_mutex);
1243 trans = btrfs_start_transaction(root, 1);
1244 btrfs_set_trans_block_group(trans, inode);
1245 err = btrfs_drop_extents(trans, root, inode,
1246 hole_start, block_end, hole_start,
1247 &alloc_hint);
1248
1249 if (alloc_hint != EXTENT_MAP_INLINE) {
1250 err = btrfs_insert_file_extent(trans, root,
1251 inode->i_ino,
1252 hole_start, 0, 0,
1253 hole_size, 0);
1254 btrfs_drop_extent_cache(inode, hole_start,
1255 (u64)-1);
1256 btrfs_check_file(root, inode);
1257 }
1258 btrfs_end_transaction(trans, root);
1259 mutex_unlock(&root->fs_info->fs_mutex);
1260 unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
1261 if (err)
1262 return err;
1263 }
1264 out:
1265 err = inode_setattr(inode, attr);
1266 fail:
1267 return err;
1268 }
1269
1270 void btrfs_delete_inode(struct inode *inode)
1271 {
1272 struct btrfs_trans_handle *trans;
1273 struct btrfs_root *root = BTRFS_I(inode)->root;
1274 unsigned long nr;
1275 int ret;
1276
1277 truncate_inode_pages(&inode->i_data, 0);
1278 if (is_bad_inode(inode)) {
1279 goto no_delete;
1280 }
1281
1282 inode->i_size = 0;
1283 mutex_lock(&root->fs_info->fs_mutex);
1284 trans = btrfs_start_transaction(root, 1);
1285
1286 btrfs_set_trans_block_group(trans, inode);
1287 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
1288 if (ret)
1289 goto no_delete_lock;
1290
1291 nr = trans->blocks_used;
1292 clear_inode(inode);
1293
1294 btrfs_end_transaction(trans, root);
1295 mutex_unlock(&root->fs_info->fs_mutex);
1296 btrfs_btree_balance_dirty(root, nr);
1297 btrfs_throttle(root);
1298 return;
1299
1300 no_delete_lock:
1301 nr = trans->blocks_used;
1302 btrfs_end_transaction(trans, root);
1303 mutex_unlock(&root->fs_info->fs_mutex);
1304 btrfs_btree_balance_dirty(root, nr);
1305 btrfs_throttle(root);
1306 no_delete:
1307 clear_inode(inode);
1308 }
1309
1310 /*
1311 * this returns the key found in the dir entry in the location pointer.
1312 * If no dir entries were found, location->objectid is 0.
1313 */
1314 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1315 struct btrfs_key *location)
1316 {
1317 const char *name = dentry->d_name.name;
1318 int namelen = dentry->d_name.len;
1319 struct btrfs_dir_item *di;
1320 struct btrfs_path *path;
1321 struct btrfs_root *root = BTRFS_I(dir)->root;
1322 int ret = 0;
1323
1324 if (namelen == 1 && strcmp(name, ".") == 0) {
1325 location->objectid = dir->i_ino;
1326 location->type = BTRFS_INODE_ITEM_KEY;
1327 location->offset = 0;
1328 return 0;
1329 }
1330 path = btrfs_alloc_path();
1331 BUG_ON(!path);
1332
1333 if (namelen == 2 && strcmp(name, "..") == 0) {
1334 struct btrfs_key key;
1335 struct extent_buffer *leaf;
1336 u32 nritems;
1337 int slot;
1338
1339 key.objectid = dir->i_ino;
1340 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1341 key.offset = 0;
1342 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1343 BUG_ON(ret == 0);
1344 ret = 0;
1345
1346 leaf = path->nodes[0];
1347 slot = path->slots[0];
1348 nritems = btrfs_header_nritems(leaf);
1349 if (slot >= nritems)
1350 goto out_err;
1351
1352 btrfs_item_key_to_cpu(leaf, &key, slot);
1353 if (key.objectid != dir->i_ino ||
1354 key.type != BTRFS_INODE_REF_KEY) {
1355 goto out_err;
1356 }
1357 location->objectid = key.offset;
1358 location->type = BTRFS_INODE_ITEM_KEY;
1359 location->offset = 0;
1360 goto out;
1361 }
1362
1363 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1364 namelen, 0);
1365 if (IS_ERR(di))
1366 ret = PTR_ERR(di);
1367 if (!di || IS_ERR(di)) {
1368 goto out_err;
1369 }
1370 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
1371 out:
1372 btrfs_free_path(path);
1373 return ret;
1374 out_err:
1375 location->objectid = 0;
1376 goto out;
1377 }
1378
1379 /*
1380 * when we hit a tree root in a directory, the btrfs part of the inode
1381 * needs to be changed to reflect the root directory of the tree root. This
1382 * is kind of like crossing a mount point.
1383 */
1384 static int fixup_tree_root_location(struct btrfs_root *root,
1385 struct btrfs_key *location,
1386 struct btrfs_root **sub_root,
1387 struct dentry *dentry)
1388 {
1389 struct btrfs_path *path;
1390 struct btrfs_root_item *ri;
1391
1392 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1393 return 0;
1394 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1395 return 0;
1396
1397 path = btrfs_alloc_path();
1398 BUG_ON(!path);
1399 mutex_lock(&root->fs_info->fs_mutex);
1400
1401 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1402 dentry->d_name.name,
1403 dentry->d_name.len);
1404 if (IS_ERR(*sub_root))
1405 return PTR_ERR(*sub_root);
1406
1407 ri = &(*sub_root)->root_item;
1408 location->objectid = btrfs_root_dirid(ri);
1409 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1410 location->offset = 0;
1411
1412 btrfs_free_path(path);
1413 mutex_unlock(&root->fs_info->fs_mutex);
1414 return 0;
1415 }
1416
1417 static int btrfs_init_locked_inode(struct inode *inode, void *p)
1418 {
1419 struct btrfs_iget_args *args = p;
1420 inode->i_ino = args->ino;
1421 BTRFS_I(inode)->root = args->root;
1422 BTRFS_I(inode)->delalloc_bytes = 0;
1423 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1424 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1425 inode->i_mapping, GFP_NOFS);
1426 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1427 inode->i_mapping, GFP_NOFS);
1428 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
1429 return 0;
1430 }
1431
1432 static int btrfs_find_actor(struct inode *inode, void *opaque)
1433 {
1434 struct btrfs_iget_args *args = opaque;
1435 return (args->ino == inode->i_ino &&
1436 args->root == BTRFS_I(inode)->root);
1437 }
1438
1439 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1440 u64 root_objectid)
1441 {
1442 struct btrfs_iget_args args;
1443 args.ino = objectid;
1444 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1445
1446 if (!args.root)
1447 return NULL;
1448
1449 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1450 }
1451
1452 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1453 struct btrfs_root *root)
1454 {
1455 struct inode *inode;
1456 struct btrfs_iget_args args;
1457 args.ino = objectid;
1458 args.root = root;
1459
1460 inode = iget5_locked(s, objectid, btrfs_find_actor,
1461 btrfs_init_locked_inode,
1462 (void *)&args);
1463 return inode;
1464 }
1465
1466 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1467 struct nameidata *nd)
1468 {
1469 struct inode * inode;
1470 struct btrfs_inode *bi = BTRFS_I(dir);
1471 struct btrfs_root *root = bi->root;
1472 struct btrfs_root *sub_root = root;
1473 struct btrfs_key location;
1474 int ret;
1475
1476 if (dentry->d_name.len > BTRFS_NAME_LEN)
1477 return ERR_PTR(-ENAMETOOLONG);
1478
1479 mutex_lock(&root->fs_info->fs_mutex);
1480 ret = btrfs_inode_by_name(dir, dentry, &location);
1481 mutex_unlock(&root->fs_info->fs_mutex);
1482
1483 if (ret < 0)
1484 return ERR_PTR(ret);
1485
1486 inode = NULL;
1487 if (location.objectid) {
1488 ret = fixup_tree_root_location(root, &location, &sub_root,
1489 dentry);
1490 if (ret < 0)
1491 return ERR_PTR(ret);
1492 if (ret > 0)
1493 return ERR_PTR(-ENOENT);
1494 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1495 sub_root);
1496 if (!inode)
1497 return ERR_PTR(-EACCES);
1498 if (inode->i_state & I_NEW) {
1499 /* the inode and parent dir are two different roots */
1500 if (sub_root != root) {
1501 igrab(inode);
1502 sub_root->inode = inode;
1503 }
1504 BTRFS_I(inode)->root = sub_root;
1505 memcpy(&BTRFS_I(inode)->location, &location,
1506 sizeof(location));
1507 btrfs_read_locked_inode(inode);
1508 unlock_new_inode(inode);
1509 }
1510 }
1511 return d_splice_alias(inode, dentry);
1512 }
1513
1514 static unsigned char btrfs_filetype_table[] = {
1515 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1516 };
1517
1518 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1519 {
1520 struct inode *inode = filp->f_dentry->d_inode;
1521 struct btrfs_root *root = BTRFS_I(inode)->root;
1522 struct btrfs_item *item;
1523 struct btrfs_dir_item *di;
1524 struct btrfs_key key;
1525 struct btrfs_key found_key;
1526 struct btrfs_path *path;
1527 int ret;
1528 u32 nritems;
1529 struct extent_buffer *leaf;
1530 int slot;
1531 int advance;
1532 unsigned char d_type;
1533 int over = 0;
1534 u32 di_cur;
1535 u32 di_total;
1536 u32 di_len;
1537 int key_type = BTRFS_DIR_INDEX_KEY;
1538 char tmp_name[32];
1539 char *name_ptr;
1540 int name_len;
1541
1542 /* FIXME, use a real flag for deciding about the key type */
1543 if (root->fs_info->tree_root == root)
1544 key_type = BTRFS_DIR_ITEM_KEY;
1545
1546 /* special case for "." */
1547 if (filp->f_pos == 0) {
1548 over = filldir(dirent, ".", 1,
1549 1, inode->i_ino,
1550 DT_DIR);
1551 if (over)
1552 return 0;
1553 filp->f_pos = 1;
1554 }
1555
1556 mutex_lock(&root->fs_info->fs_mutex);
1557 key.objectid = inode->i_ino;
1558 path = btrfs_alloc_path();
1559 path->reada = 2;
1560
1561 /* special case for .., just use the back ref */
1562 if (filp->f_pos == 1) {
1563 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1564 key.offset = 0;
1565 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1566 BUG_ON(ret == 0);
1567 leaf = path->nodes[0];
1568 slot = path->slots[0];
1569 nritems = btrfs_header_nritems(leaf);
1570 if (slot >= nritems) {
1571 btrfs_release_path(root, path);
1572 goto read_dir_items;
1573 }
1574 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1575 btrfs_release_path(root, path);
1576 if (found_key.objectid != key.objectid ||
1577 found_key.type != BTRFS_INODE_REF_KEY)
1578 goto read_dir_items;
1579 over = filldir(dirent, "..", 2,
1580 2, found_key.offset, DT_DIR);
1581 if (over)
1582 goto nopos;
1583 filp->f_pos = 2;
1584 }
1585
1586 read_dir_items:
1587 btrfs_set_key_type(&key, key_type);
1588 key.offset = filp->f_pos;
1589
1590 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1591 if (ret < 0)
1592 goto err;
1593 advance = 0;
1594 while(1) {
1595 leaf = path->nodes[0];
1596 nritems = btrfs_header_nritems(leaf);
1597 slot = path->slots[0];
1598 if (advance || slot >= nritems) {
1599 if (slot >= nritems -1) {
1600 ret = btrfs_next_leaf(root, path);
1601 if (ret)
1602 break;
1603 leaf = path->nodes[0];
1604 nritems = btrfs_header_nritems(leaf);
1605 slot = path->slots[0];
1606 } else {
1607 slot++;
1608 path->slots[0]++;
1609 }
1610 }
1611 advance = 1;
1612 item = btrfs_item_nr(leaf, slot);
1613 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1614
1615 if (found_key.objectid != key.objectid)
1616 break;
1617 if (btrfs_key_type(&found_key) != key_type)
1618 break;
1619 if (found_key.offset < filp->f_pos)
1620 continue;
1621
1622 filp->f_pos = found_key.offset;
1623 advance = 1;
1624 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1625 di_cur = 0;
1626 di_total = btrfs_item_size(leaf, item);
1627 while(di_cur < di_total) {
1628 struct btrfs_key location;
1629
1630 name_len = btrfs_dir_name_len(leaf, di);
1631 if (name_len < 32) {
1632 name_ptr = tmp_name;
1633 } else {
1634 name_ptr = kmalloc(name_len, GFP_NOFS);
1635 BUG_ON(!name_ptr);
1636 }
1637 read_extent_buffer(leaf, name_ptr,
1638 (unsigned long)(di + 1), name_len);
1639
1640 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1641 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1642 over = filldir(dirent, name_ptr, name_len,
1643 found_key.offset,
1644 location.objectid,
1645 d_type);
1646
1647 if (name_ptr != tmp_name)
1648 kfree(name_ptr);
1649
1650 if (over)
1651 goto nopos;
1652 di_len = btrfs_dir_name_len(leaf, di) +
1653 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1654 di_cur += di_len;
1655 di = (struct btrfs_dir_item *)((char *)di + di_len);
1656 }
1657 }
1658 if (key_type == BTRFS_DIR_INDEX_KEY)
1659 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1660 else
1661 filp->f_pos++;
1662 nopos:
1663 ret = 0;
1664 err:
1665 btrfs_release_path(root, path);
1666 btrfs_free_path(path);
1667 mutex_unlock(&root->fs_info->fs_mutex);
1668 return ret;
1669 }
1670
1671 int btrfs_write_inode(struct inode *inode, int wait)
1672 {
1673 struct btrfs_root *root = BTRFS_I(inode)->root;
1674 struct btrfs_trans_handle *trans;
1675 int ret = 0;
1676
1677 if (wait) {
1678 mutex_lock(&root->fs_info->fs_mutex);
1679 trans = btrfs_start_transaction(root, 1);
1680 btrfs_set_trans_block_group(trans, inode);
1681 ret = btrfs_commit_transaction(trans, root);
1682 mutex_unlock(&root->fs_info->fs_mutex);
1683 }
1684 return ret;
1685 }
1686
1687 /*
1688 * This is somewhat expensive, updating the tree every time the
1689 * inode changes. But, it is most likely to find the inode in cache.
1690 * FIXME, needs more benchmarking...there are no reasons other than performance
1691 * to keep or drop this code.
1692 */
1693 void btrfs_dirty_inode(struct inode *inode)
1694 {
1695 struct btrfs_root *root = BTRFS_I(inode)->root;
1696 struct btrfs_trans_handle *trans;
1697
1698 mutex_lock(&root->fs_info->fs_mutex);
1699 trans = btrfs_start_transaction(root, 1);
1700 btrfs_set_trans_block_group(trans, inode);
1701 btrfs_update_inode(trans, root, inode);
1702 btrfs_end_transaction(trans, root);
1703 mutex_unlock(&root->fs_info->fs_mutex);
1704 }
1705
1706 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1707 struct btrfs_root *root,
1708 const char *name, int name_len,
1709 u64 ref_objectid,
1710 u64 objectid,
1711 struct btrfs_block_group_cache *group,
1712 int mode)
1713 {
1714 struct inode *inode;
1715 struct btrfs_inode_item *inode_item;
1716 struct btrfs_block_group_cache *new_inode_group;
1717 struct btrfs_key *location;
1718 struct btrfs_path *path;
1719 struct btrfs_inode_ref *ref;
1720 struct btrfs_key key[2];
1721 u32 sizes[2];
1722 unsigned long ptr;
1723 int ret;
1724 int owner;
1725
1726 path = btrfs_alloc_path();
1727 BUG_ON(!path);
1728
1729 inode = new_inode(root->fs_info->sb);
1730 if (!inode)
1731 return ERR_PTR(-ENOMEM);
1732
1733 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1734 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1735 inode->i_mapping, GFP_NOFS);
1736 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1737 inode->i_mapping, GFP_NOFS);
1738 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
1739 BTRFS_I(inode)->delalloc_bytes = 0;
1740 BTRFS_I(inode)->root = root;
1741
1742 if (mode & S_IFDIR)
1743 owner = 0;
1744 else
1745 owner = 1;
1746 new_inode_group = btrfs_find_block_group(root, group, 0,
1747 BTRFS_BLOCK_GROUP_METADATA, owner);
1748 if (!new_inode_group) {
1749 printk("find_block group failed\n");
1750 new_inode_group = group;
1751 }
1752 BTRFS_I(inode)->block_group = new_inode_group;
1753 BTRFS_I(inode)->flags = 0;
1754
1755 key[0].objectid = objectid;
1756 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1757 key[0].offset = 0;
1758
1759 key[1].objectid = objectid;
1760 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1761 key[1].offset = ref_objectid;
1762
1763 sizes[0] = sizeof(struct btrfs_inode_item);
1764 sizes[1] = name_len + sizeof(*ref);
1765
1766 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1767 if (ret != 0)
1768 goto fail;
1769
1770 if (objectid > root->highest_inode)
1771 root->highest_inode = objectid;
1772
1773 inode->i_uid = current->fsuid;
1774 inode->i_gid = current->fsgid;
1775 inode->i_mode = mode;
1776 inode->i_ino = objectid;
1777 inode->i_blocks = 0;
1778 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1779 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1780 struct btrfs_inode_item);
1781 fill_inode_item(path->nodes[0], inode_item, inode);
1782
1783 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1784 struct btrfs_inode_ref);
1785 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1786 ptr = (unsigned long)(ref + 1);
1787 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1788
1789 btrfs_mark_buffer_dirty(path->nodes[0]);
1790 btrfs_free_path(path);
1791
1792 location = &BTRFS_I(inode)->location;
1793 location->objectid = objectid;
1794 location->offset = 0;
1795 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1796
1797 insert_inode_hash(inode);
1798 return inode;
1799 fail:
1800 btrfs_free_path(path);
1801 return ERR_PTR(ret);
1802 }
1803
1804 static inline u8 btrfs_inode_type(struct inode *inode)
1805 {
1806 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1807 }
1808
1809 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1810 struct dentry *dentry, struct inode *inode,
1811 int add_backref)
1812 {
1813 int ret;
1814 struct btrfs_key key;
1815 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1816 struct inode *parent_inode;
1817
1818 key.objectid = inode->i_ino;
1819 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1820 key.offset = 0;
1821
1822 ret = btrfs_insert_dir_item(trans, root,
1823 dentry->d_name.name, dentry->d_name.len,
1824 dentry->d_parent->d_inode->i_ino,
1825 &key, btrfs_inode_type(inode));
1826 if (ret == 0) {
1827 if (add_backref) {
1828 ret = btrfs_insert_inode_ref(trans, root,
1829 dentry->d_name.name,
1830 dentry->d_name.len,
1831 inode->i_ino,
1832 dentry->d_parent->d_inode->i_ino);
1833 }
1834 parent_inode = dentry->d_parent->d_inode;
1835 parent_inode->i_size += dentry->d_name.len * 2;
1836 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1837 ret = btrfs_update_inode(trans, root,
1838 dentry->d_parent->d_inode);
1839 }
1840 return ret;
1841 }
1842
1843 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1844 struct dentry *dentry, struct inode *inode,
1845 int backref)
1846 {
1847 int err = btrfs_add_link(trans, dentry, inode, backref);
1848 if (!err) {
1849 d_instantiate(dentry, inode);
1850 return 0;
1851 }
1852 if (err > 0)
1853 err = -EEXIST;
1854 return err;
1855 }
1856
1857 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1858 int mode, dev_t rdev)
1859 {
1860 struct btrfs_trans_handle *trans;
1861 struct btrfs_root *root = BTRFS_I(dir)->root;
1862 struct inode *inode = NULL;
1863 int err;
1864 int drop_inode = 0;
1865 u64 objectid;
1866 unsigned long nr = 0;
1867
1868 if (!new_valid_dev(rdev))
1869 return -EINVAL;
1870
1871 mutex_lock(&root->fs_info->fs_mutex);
1872 err = btrfs_check_free_space(root, 1, 0);
1873 if (err)
1874 goto fail;
1875
1876 trans = btrfs_start_transaction(root, 1);
1877 btrfs_set_trans_block_group(trans, dir);
1878
1879 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1880 if (err) {
1881 err = -ENOSPC;
1882 goto out_unlock;
1883 }
1884
1885 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1886 dentry->d_name.len,
1887 dentry->d_parent->d_inode->i_ino, objectid,
1888 BTRFS_I(dir)->block_group, mode);
1889 err = PTR_ERR(inode);
1890 if (IS_ERR(inode))
1891 goto out_unlock;
1892
1893 btrfs_set_trans_block_group(trans, inode);
1894 err = btrfs_add_nondir(trans, dentry, inode, 0);
1895 if (err)
1896 drop_inode = 1;
1897 else {
1898 inode->i_op = &btrfs_special_inode_operations;
1899 init_special_inode(inode, inode->i_mode, rdev);
1900 btrfs_update_inode(trans, root, inode);
1901 }
1902 dir->i_sb->s_dirt = 1;
1903 btrfs_update_inode_block_group(trans, inode);
1904 btrfs_update_inode_block_group(trans, dir);
1905 out_unlock:
1906 nr = trans->blocks_used;
1907 btrfs_end_transaction(trans, root);
1908 fail:
1909 mutex_unlock(&root->fs_info->fs_mutex);
1910
1911 if (drop_inode) {
1912 inode_dec_link_count(inode);
1913 iput(inode);
1914 }
1915 btrfs_btree_balance_dirty(root, nr);
1916 btrfs_throttle(root);
1917 return err;
1918 }
1919
1920 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1921 int mode, struct nameidata *nd)
1922 {
1923 struct btrfs_trans_handle *trans;
1924 struct btrfs_root *root = BTRFS_I(dir)->root;
1925 struct inode *inode = NULL;
1926 int err;
1927 int drop_inode = 0;
1928 unsigned long nr = 0;
1929 u64 objectid;
1930
1931 mutex_lock(&root->fs_info->fs_mutex);
1932 err = btrfs_check_free_space(root, 1, 0);
1933 if (err)
1934 goto fail;
1935 trans = btrfs_start_transaction(root, 1);
1936 btrfs_set_trans_block_group(trans, dir);
1937
1938 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1939 if (err) {
1940 err = -ENOSPC;
1941 goto out_unlock;
1942 }
1943
1944 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1945 dentry->d_name.len,
1946 dentry->d_parent->d_inode->i_ino,
1947 objectid, BTRFS_I(dir)->block_group, mode);
1948 err = PTR_ERR(inode);
1949 if (IS_ERR(inode))
1950 goto out_unlock;
1951
1952 btrfs_set_trans_block_group(trans, inode);
1953 err = btrfs_add_nondir(trans, dentry, inode, 0);
1954 if (err)
1955 drop_inode = 1;
1956 else {
1957 inode->i_mapping->a_ops = &btrfs_aops;
1958 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
1959 inode->i_fop = &btrfs_file_operations;
1960 inode->i_op = &btrfs_file_inode_operations;
1961 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1962 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1963 inode->i_mapping, GFP_NOFS);
1964 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1965 inode->i_mapping, GFP_NOFS);
1966 BTRFS_I(inode)->delalloc_bytes = 0;
1967 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
1968 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
1969 }
1970 dir->i_sb->s_dirt = 1;
1971 btrfs_update_inode_block_group(trans, inode);
1972 btrfs_update_inode_block_group(trans, dir);
1973 out_unlock:
1974 nr = trans->blocks_used;
1975 btrfs_end_transaction(trans, root);
1976 fail:
1977 mutex_unlock(&root->fs_info->fs_mutex);
1978
1979 if (drop_inode) {
1980 inode_dec_link_count(inode);
1981 iput(inode);
1982 }
1983 btrfs_btree_balance_dirty(root, nr);
1984 btrfs_throttle(root);
1985 return err;
1986 }
1987
1988 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1989 struct dentry *dentry)
1990 {
1991 struct btrfs_trans_handle *trans;
1992 struct btrfs_root *root = BTRFS_I(dir)->root;
1993 struct inode *inode = old_dentry->d_inode;
1994 unsigned long nr = 0;
1995 int err;
1996 int drop_inode = 0;
1997
1998 if (inode->i_nlink == 0)
1999 return -ENOENT;
2000
2001 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
2002 inode->i_nlink++;
2003 #else
2004 inc_nlink(inode);
2005 #endif
2006 mutex_lock(&root->fs_info->fs_mutex);
2007 err = btrfs_check_free_space(root, 1, 0);
2008 if (err)
2009 goto fail;
2010 trans = btrfs_start_transaction(root, 1);
2011
2012 btrfs_set_trans_block_group(trans, dir);
2013 atomic_inc(&inode->i_count);
2014 err = btrfs_add_nondir(trans, dentry, inode, 1);
2015
2016 if (err)
2017 drop_inode = 1;
2018
2019 dir->i_sb->s_dirt = 1;
2020 btrfs_update_inode_block_group(trans, dir);
2021 err = btrfs_update_inode(trans, root, inode);
2022
2023 if (err)
2024 drop_inode = 1;
2025
2026 nr = trans->blocks_used;
2027 btrfs_end_transaction(trans, root);
2028 fail:
2029 mutex_unlock(&root->fs_info->fs_mutex);
2030
2031 if (drop_inode) {
2032 inode_dec_link_count(inode);
2033 iput(inode);
2034 }
2035 btrfs_btree_balance_dirty(root, nr);
2036 btrfs_throttle(root);
2037 return err;
2038 }
2039
2040 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
2041 {
2042 struct inode *inode = NULL;
2043 struct btrfs_trans_handle *trans;
2044 struct btrfs_root *root = BTRFS_I(dir)->root;
2045 int err = 0;
2046 int drop_on_err = 0;
2047 u64 objectid = 0;
2048 unsigned long nr = 1;
2049
2050 mutex_lock(&root->fs_info->fs_mutex);
2051 err = btrfs_check_free_space(root, 1, 0);
2052 if (err)
2053 goto out_unlock;
2054
2055 trans = btrfs_start_transaction(root, 1);
2056 btrfs_set_trans_block_group(trans, dir);
2057
2058 if (IS_ERR(trans)) {
2059 err = PTR_ERR(trans);
2060 goto out_unlock;
2061 }
2062
2063 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2064 if (err) {
2065 err = -ENOSPC;
2066 goto out_unlock;
2067 }
2068
2069 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2070 dentry->d_name.len,
2071 dentry->d_parent->d_inode->i_ino, objectid,
2072 BTRFS_I(dir)->block_group, S_IFDIR | mode);
2073 if (IS_ERR(inode)) {
2074 err = PTR_ERR(inode);
2075 goto out_fail;
2076 }
2077
2078 drop_on_err = 1;
2079 inode->i_op = &btrfs_dir_inode_operations;
2080 inode->i_fop = &btrfs_dir_file_operations;
2081 btrfs_set_trans_block_group(trans, inode);
2082
2083 inode->i_size = 0;
2084 err = btrfs_update_inode(trans, root, inode);
2085 if (err)
2086 goto out_fail;
2087
2088 err = btrfs_add_link(trans, dentry, inode, 0);
2089 if (err)
2090 goto out_fail;
2091
2092 d_instantiate(dentry, inode);
2093 drop_on_err = 0;
2094 dir->i_sb->s_dirt = 1;
2095 btrfs_update_inode_block_group(trans, inode);
2096 btrfs_update_inode_block_group(trans, dir);
2097
2098 out_fail:
2099 nr = trans->blocks_used;
2100 btrfs_end_transaction(trans, root);
2101
2102 out_unlock:
2103 mutex_unlock(&root->fs_info->fs_mutex);
2104 if (drop_on_err)
2105 iput(inode);
2106 btrfs_btree_balance_dirty(root, nr);
2107 btrfs_throttle(root);
2108 return err;
2109 }
2110
2111 static int merge_extent_mapping(struct extent_map_tree *em_tree,
2112 struct extent_map *existing,
2113 struct extent_map *em)
2114 {
2115 u64 start_diff;
2116 u64 new_end;
2117 int ret = 0;
2118 int real_blocks = existing->block_start < EXTENT_MAP_LAST_BYTE;
2119
2120 if (real_blocks && em->block_start >= EXTENT_MAP_LAST_BYTE)
2121 goto invalid;
2122
2123 if (!real_blocks && em->block_start != existing->block_start)
2124 goto invalid;
2125
2126 new_end = max(existing->start + existing->len, em->start + em->len);
2127
2128 if (existing->start >= em->start) {
2129 if (em->start + em->len < existing->start)
2130 goto invalid;
2131
2132 start_diff = existing->start - em->start;
2133 if (real_blocks && em->block_start + start_diff !=
2134 existing->block_start)
2135 goto invalid;
2136
2137 em->len = new_end - em->start;
2138
2139 remove_extent_mapping(em_tree, existing);
2140 /* free for the tree */
2141 free_extent_map(existing);
2142 ret = add_extent_mapping(em_tree, em);
2143
2144 } else if (em->start > existing->start) {
2145
2146 if (existing->start + existing->len < em->start)
2147 goto invalid;
2148
2149 start_diff = em->start - existing->start;
2150 if (real_blocks && existing->block_start + start_diff !=
2151 em->block_start)
2152 goto invalid;
2153
2154 remove_extent_mapping(em_tree, existing);
2155 em->block_start = existing->block_start;
2156 em->start = existing->start;
2157 em->len = new_end - existing->start;
2158 free_extent_map(existing);
2159
2160 ret = add_extent_mapping(em_tree, em);
2161 } else {
2162 goto invalid;
2163 }
2164 return ret;
2165
2166 invalid:
2167 printk("invalid extent map merge [%Lu %Lu %Lu] [%Lu %Lu %Lu]\n",
2168 existing->start, existing->len, existing->block_start,
2169 em->start, em->len, em->block_start);
2170 return -EIO;
2171 }
2172
2173 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2174 size_t pg_offset, u64 start, u64 len,
2175 int create)
2176 {
2177 int ret;
2178 int err = 0;
2179 u64 bytenr;
2180 u64 extent_start = 0;
2181 u64 extent_end = 0;
2182 u64 objectid = inode->i_ino;
2183 u32 found_type;
2184 struct btrfs_path *path;
2185 struct btrfs_root *root = BTRFS_I(inode)->root;
2186 struct btrfs_file_extent_item *item;
2187 struct extent_buffer *leaf;
2188 struct btrfs_key found_key;
2189 struct extent_map *em = NULL;
2190 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2191 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2192 struct btrfs_trans_handle *trans = NULL;
2193
2194 path = btrfs_alloc_path();
2195 BUG_ON(!path);
2196 mutex_lock(&root->fs_info->fs_mutex);
2197
2198 again:
2199 spin_lock(&em_tree->lock);
2200 em = lookup_extent_mapping(em_tree, start, len);
2201 if (em)
2202 em->bdev = root->fs_info->fs_devices->latest_bdev;
2203 spin_unlock(&em_tree->lock);
2204
2205 if (em) {
2206 if (em->start > start || em->start + em->len <= start)
2207 free_extent_map(em);
2208 else if (em->block_start == EXTENT_MAP_INLINE && page)
2209 free_extent_map(em);
2210 else
2211 goto out;
2212 }
2213 em = alloc_extent_map(GFP_NOFS);
2214 if (!em) {
2215 err = -ENOMEM;
2216 goto out;
2217 }
2218
2219 em->start = EXTENT_MAP_HOLE;
2220 em->len = (u64)-1;
2221 em->bdev = root->fs_info->fs_devices->latest_bdev;
2222 ret = btrfs_lookup_file_extent(trans, root, path,
2223 objectid, start, trans != NULL);
2224 if (ret < 0) {
2225 err = ret;
2226 goto out;
2227 }
2228
2229 if (ret != 0) {
2230 if (path->slots[0] == 0)
2231 goto not_found;
2232 path->slots[0]--;
2233 }
2234
2235 leaf = path->nodes[0];
2236 item = btrfs_item_ptr(leaf, path->slots[0],
2237 struct btrfs_file_extent_item);
2238 /* are we inside the extent that was found? */
2239 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2240 found_type = btrfs_key_type(&found_key);
2241 if (found_key.objectid != objectid ||
2242 found_type != BTRFS_EXTENT_DATA_KEY) {
2243 goto not_found;
2244 }
2245
2246 found_type = btrfs_file_extent_type(leaf, item);
2247 extent_start = found_key.offset;
2248 if (found_type == BTRFS_FILE_EXTENT_REG) {
2249 extent_end = extent_start +
2250 btrfs_file_extent_num_bytes(leaf, item);
2251 err = 0;
2252 if (start < extent_start || start >= extent_end) {
2253 em->start = start;
2254 if (start < extent_start) {
2255 if (start + len <= extent_start)
2256 goto not_found;
2257 em->len = extent_end - extent_start;
2258 } else {
2259 em->len = len;
2260 }
2261 goto not_found_em;
2262 }
2263 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
2264 if (bytenr == 0) {
2265 em->start = extent_start;
2266 em->len = extent_end - extent_start;
2267 em->block_start = EXTENT_MAP_HOLE;
2268 goto insert;
2269 }
2270 bytenr += btrfs_file_extent_offset(leaf, item);
2271 em->block_start = bytenr;
2272 em->start = extent_start;
2273 em->len = extent_end - extent_start;
2274 goto insert;
2275 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
2276 u64 page_start;
2277 unsigned long ptr;
2278 char *map;
2279 size_t size;
2280 size_t extent_offset;
2281 size_t copy_size;
2282
2283 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2284 path->slots[0]));
2285 extent_end = (extent_start + size + root->sectorsize - 1) &
2286 ~((u64)root->sectorsize - 1);
2287 if (start < extent_start || start >= extent_end) {
2288 em->start = start;
2289 if (start < extent_start) {
2290 if (start + len <= extent_start)
2291 goto not_found;
2292 em->len = extent_end - extent_start;
2293 } else {
2294 em->len = len;
2295 }
2296 goto not_found_em;
2297 }
2298 em->block_start = EXTENT_MAP_INLINE;
2299
2300 if (!page) {
2301 em->start = extent_start;
2302 em->len = size;
2303 goto out;
2304 }
2305
2306 page_start = page_offset(page) + pg_offset;
2307 extent_offset = page_start - extent_start;
2308 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
2309 size - extent_offset);
2310 em->start = extent_start + extent_offset;
2311 em->len = (copy_size + root->sectorsize - 1) &
2312 ~((u64)root->sectorsize - 1);
2313 map = kmap(page);
2314 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
2315 if (create == 0 && !PageUptodate(page)) {
2316 read_extent_buffer(leaf, map + pg_offset, ptr,
2317 copy_size);
2318 flush_dcache_page(page);
2319 } else if (create && PageUptodate(page)) {
2320 if (!trans) {
2321 kunmap(page);
2322 free_extent_map(em);
2323 em = NULL;
2324 btrfs_release_path(root, path);
2325 trans = btrfs_start_transaction(root, 1);
2326 goto again;
2327 }
2328 write_extent_buffer(leaf, map + pg_offset, ptr,
2329 copy_size);
2330 btrfs_mark_buffer_dirty(leaf);
2331 }
2332 kunmap(page);
2333 set_extent_uptodate(io_tree, em->start,
2334 extent_map_end(em) - 1, GFP_NOFS);
2335 goto insert;
2336 } else {
2337 printk("unkknown found_type %d\n", found_type);
2338 WARN_ON(1);
2339 }
2340 not_found:
2341 em->start = start;
2342 em->len = len;
2343 not_found_em:
2344 em->block_start = EXTENT_MAP_HOLE;
2345 insert:
2346 btrfs_release_path(root, path);
2347 if (em->start > start || extent_map_end(em) <= start) {
2348 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
2349 err = -EIO;
2350 goto out;
2351 }
2352
2353 err = 0;
2354 spin_lock(&em_tree->lock);
2355 ret = add_extent_mapping(em_tree, em);
2356 /* it is possible that someone inserted the extent into the tree
2357 * while we had the lock dropped. It is also possible that
2358 * an overlapping map exists in the tree
2359 */
2360 if (ret == -EEXIST) {
2361 struct extent_map *existing;
2362 existing = lookup_extent_mapping(em_tree, start, len);
2363 if (existing && (existing->start > start ||
2364 existing->start + existing->len <= start)) {
2365 free_extent_map(existing);
2366 existing = NULL;
2367 }
2368 if (!existing) {
2369 existing = lookup_extent_mapping(em_tree, em->start,
2370 em->len);
2371 if (existing) {
2372 err = merge_extent_mapping(em_tree, existing,
2373 em);
2374 free_extent_map(existing);
2375 if (err) {
2376 free_extent_map(em);
2377 em = NULL;
2378 }
2379 } else {
2380 err = -EIO;
2381 printk("failing to insert %Lu %Lu\n",
2382 start, len);
2383 free_extent_map(em);
2384 em = NULL;
2385 }
2386 } else {
2387 free_extent_map(em);
2388 em = existing;
2389 }
2390 }
2391 spin_unlock(&em_tree->lock);
2392 out:
2393 btrfs_free_path(path);
2394 if (trans) {
2395 ret = btrfs_end_transaction(trans, root);
2396 if (!err)
2397 err = ret;
2398 }
2399 mutex_unlock(&root->fs_info->fs_mutex);
2400 if (err) {
2401 free_extent_map(em);
2402 WARN_ON(1);
2403 return ERR_PTR(err);
2404 }
2405 return em;
2406 }
2407
2408 #if 0 /* waiting for O_DIRECT reads */
2409 static int btrfs_get_block(struct inode *inode, sector_t iblock,
2410 struct buffer_head *bh_result, int create)
2411 {
2412 struct extent_map *em;
2413 u64 start = (u64)iblock << inode->i_blkbits;
2414 struct btrfs_multi_bio *multi = NULL;
2415 struct btrfs_root *root = BTRFS_I(inode)->root;
2416 u64 len;
2417 u64 logical;
2418 u64 map_length;
2419 int ret = 0;
2420
2421 em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0);
2422
2423 if (!em || IS_ERR(em))
2424 goto out;
2425
2426 if (em->start > start || em->start + em->len <= start) {
2427 goto out;
2428 }
2429
2430 if (em->block_start == EXTENT_MAP_INLINE) {
2431 ret = -EINVAL;
2432 goto out;
2433 }
2434
2435 len = em->start + em->len - start;
2436 len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size)));
2437
2438 if (em->block_start == EXTENT_MAP_HOLE ||
2439 em->block_start == EXTENT_MAP_DELALLOC) {
2440 bh_result->b_size = len;
2441 goto out;
2442 }
2443
2444 logical = start - em->start;
2445 logical = em->block_start + logical;
2446
2447 map_length = len;
2448 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
2449 logical, &map_length, &multi, 0);
2450 BUG_ON(ret);
2451 bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits;
2452 bh_result->b_size = min(map_length, len);
2453
2454 bh_result->b_bdev = multi->stripes[0].dev->bdev;
2455 set_buffer_mapped(bh_result);
2456 kfree(multi);
2457 out:
2458 free_extent_map(em);
2459 return ret;
2460 }
2461 #endif
2462
2463 static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
2464 const struct iovec *iov, loff_t offset,
2465 unsigned long nr_segs)
2466 {
2467 return -EINVAL;
2468 #if 0
2469 struct file *file = iocb->ki_filp;
2470 struct inode *inode = file->f_mapping->host;
2471
2472 if (rw == WRITE)
2473 return -EINVAL;
2474
2475 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2476 offset, nr_segs, btrfs_get_block, NULL);
2477 #endif
2478 }
2479
2480 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
2481 {
2482 return extent_bmap(mapping, iblock, btrfs_get_extent);
2483 }
2484
2485 int btrfs_readpage(struct file *file, struct page *page)
2486 {
2487 struct extent_io_tree *tree;
2488 tree = &BTRFS_I(page->mapping->host)->io_tree;
2489 return extent_read_full_page(tree, page, btrfs_get_extent);
2490 }
2491
2492 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
2493 {
2494 struct extent_io_tree *tree;
2495
2496
2497 if (current->flags & PF_MEMALLOC) {
2498 redirty_page_for_writepage(wbc, page);
2499 unlock_page(page);
2500 return 0;
2501 }
2502 tree = &BTRFS_I(page->mapping->host)->io_tree;
2503 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
2504 }
2505
2506 static int btrfs_writepages(struct address_space *mapping,
2507 struct writeback_control *wbc)
2508 {
2509 struct extent_io_tree *tree;
2510 tree = &BTRFS_I(mapping->host)->io_tree;
2511 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2512 }
2513
2514 static int
2515 btrfs_readpages(struct file *file, struct address_space *mapping,
2516 struct list_head *pages, unsigned nr_pages)
2517 {
2518 struct extent_io_tree *tree;
2519 tree = &BTRFS_I(mapping->host)->io_tree;
2520 return extent_readpages(tree, mapping, pages, nr_pages,
2521 btrfs_get_extent);
2522 }
2523
2524 static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
2525 {
2526 struct extent_io_tree *tree;
2527 struct extent_map_tree *map;
2528 int ret;
2529
2530 tree = &BTRFS_I(page->mapping->host)->io_tree;
2531 map = &BTRFS_I(page->mapping->host)->extent_tree;
2532 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
2533 if (ret == 1) {
2534 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
2535 ClearPagePrivate(page);
2536 set_page_private(page, 0);
2537 page_cache_release(page);
2538 }
2539 return ret;
2540 }
2541
2542 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
2543 {
2544 struct extent_io_tree *tree;
2545
2546 tree = &BTRFS_I(page->mapping->host)->io_tree;
2547 extent_invalidatepage(tree, page, offset);
2548 btrfs_releasepage(page, GFP_NOFS);
2549 if (PagePrivate(page)) {
2550 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
2551 ClearPagePrivate(page);
2552 set_page_private(page, 0);
2553 page_cache_release(page);
2554 }
2555 }
2556
2557 /*
2558 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2559 * called from a page fault handler when a page is first dirtied. Hence we must
2560 * be careful to check for EOF conditions here. We set the page up correctly
2561 * for a written page which means we get ENOSPC checking when writing into
2562 * holes and correct delalloc and unwritten extent mapping on filesystems that
2563 * support these features.
2564 *
2565 * We are not allowed to take the i_mutex here so we have to play games to
2566 * protect against truncate races as the page could now be beyond EOF. Because
2567 * vmtruncate() writes the inode size before removing pages, once we have the
2568 * page lock we can determine safely if the page is beyond EOF. If it is not
2569 * beyond EOF, then the page is guaranteed safe against truncation until we
2570 * unlock the page.
2571 */
2572 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2573 {
2574 struct inode *inode = fdentry(vma->vm_file)->d_inode;
2575 struct btrfs_root *root = BTRFS_I(inode)->root;
2576 unsigned long end;
2577 loff_t size;
2578 int ret;
2579 u64 page_start;
2580
2581 mutex_lock(&root->fs_info->fs_mutex);
2582 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
2583 mutex_unlock(&root->fs_info->fs_mutex);
2584 if (ret)
2585 goto out;
2586
2587 ret = -EINVAL;
2588
2589 lock_page(page);
2590 wait_on_page_writeback(page);
2591 size = i_size_read(inode);
2592 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2593
2594 if ((page->mapping != inode->i_mapping) ||
2595 (page_start > size)) {
2596 /* page got truncated out from underneath us */
2597 goto out_unlock;
2598 }
2599
2600 /* page is wholly or partially inside EOF */
2601 if (page_start + PAGE_CACHE_SIZE > size)
2602 end = size & ~PAGE_CACHE_MASK;
2603 else
2604 end = PAGE_CACHE_SIZE;
2605
2606 ret = btrfs_cow_one_page(inode, page, end);
2607
2608 out_unlock:
2609 unlock_page(page);
2610 out:
2611 return ret;
2612 }
2613
2614 static void btrfs_truncate(struct inode *inode)
2615 {
2616 struct btrfs_root *root = BTRFS_I(inode)->root;
2617 int ret;
2618 struct btrfs_trans_handle *trans;
2619 unsigned long nr;
2620
2621 if (!S_ISREG(inode->i_mode))
2622 return;
2623 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2624 return;
2625
2626 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2627
2628 mutex_lock(&root->fs_info->fs_mutex);
2629 trans = btrfs_start_transaction(root, 1);
2630 btrfs_set_trans_block_group(trans, inode);
2631
2632 /* FIXME, add redo link to tree so we don't leak on crash */
2633 ret = btrfs_truncate_in_trans(trans, root, inode,
2634 BTRFS_EXTENT_DATA_KEY);
2635 btrfs_update_inode(trans, root, inode);
2636 nr = trans->blocks_used;
2637
2638 ret = btrfs_end_transaction(trans, root);
2639 BUG_ON(ret);
2640 mutex_unlock(&root->fs_info->fs_mutex);
2641 btrfs_btree_balance_dirty(root, nr);
2642 btrfs_throttle(root);
2643 }
2644
2645 /*
2646 * Invalidate a single dcache entry at the root of the filesystem.
2647 * Needed after creation of snapshot or subvolume.
2648 */
2649 void btrfs_invalidate_dcache_root(struct btrfs_root *root, char *name,
2650 int namelen)
2651 {
2652 struct dentry *alias, *entry;
2653 struct qstr qstr;
2654
2655 alias = d_find_alias(root->fs_info->sb->s_root->d_inode);
2656 if (alias) {
2657 qstr.name = name;
2658 qstr.len = namelen;
2659 /* change me if btrfs ever gets a d_hash operation */
2660 qstr.hash = full_name_hash(qstr.name, qstr.len);
2661 entry = d_lookup(alias, &qstr);
2662 dput(alias);
2663 if (entry) {
2664 d_invalidate(entry);
2665 dput(entry);
2666 }
2667 }
2668 }
2669
2670 static int noinline create_subvol(struct btrfs_root *root, char *name,
2671 int namelen)
2672 {
2673 struct btrfs_trans_handle *trans;
2674 struct btrfs_key key;
2675 struct btrfs_root_item root_item;
2676 struct btrfs_inode_item *inode_item;
2677 struct extent_buffer *leaf;
2678 struct btrfs_root *new_root = root;
2679 struct inode *inode;
2680 struct inode *dir;
2681 int ret;
2682 int err;
2683 u64 objectid;
2684 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2685 unsigned long nr = 1;
2686
2687 mutex_lock(&root->fs_info->fs_mutex);
2688 ret = btrfs_check_free_space(root, 1, 0);
2689 if (ret)
2690 goto fail_commit;
2691
2692 trans = btrfs_start_transaction(root, 1);
2693 BUG_ON(!trans);
2694
2695 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2696 0, &objectid);
2697 if (ret)
2698 goto fail;
2699
2700 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2701 objectid, trans->transid, 0, 0,
2702 0, 0);
2703 if (IS_ERR(leaf))
2704 return PTR_ERR(leaf);
2705
2706 btrfs_set_header_nritems(leaf, 0);
2707 btrfs_set_header_level(leaf, 0);
2708 btrfs_set_header_bytenr(leaf, leaf->start);
2709 btrfs_set_header_generation(leaf, trans->transid);
2710 btrfs_set_header_owner(leaf, objectid);
2711
2712 write_extent_buffer(leaf, root->fs_info->fsid,
2713 (unsigned long)btrfs_header_fsid(leaf),
2714 BTRFS_FSID_SIZE);
2715 btrfs_mark_buffer_dirty(leaf);
2716
2717 inode_item = &root_item.inode;
2718 memset(inode_item, 0, sizeof(*inode_item));
2719 inode_item->generation = cpu_to_le64(1);
2720 inode_item->size = cpu_to_le64(3);
2721 inode_item->nlink = cpu_to_le32(1);
2722 inode_item->nblocks = cpu_to_le64(1);
2723 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
2724
2725 btrfs_set_root_bytenr(&root_item, leaf->start);
2726 btrfs_set_root_level(&root_item, 0);
2727 btrfs_set_root_refs(&root_item, 1);
2728 btrfs_set_root_used(&root_item, 0);
2729
2730 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2731 root_item.drop_level = 0;
2732
2733 free_extent_buffer(leaf);
2734 leaf = NULL;
2735
2736 btrfs_set_root_dirid(&root_item, new_dirid);
2737
2738 key.objectid = objectid;
2739 key.offset = 1;
2740 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2741 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2742 &root_item);
2743 if (ret)
2744 goto fail;
2745
2746 /*
2747 * insert the directory item
2748 */
2749 key.offset = (u64)-1;
2750 dir = root->fs_info->sb->s_root->d_inode;
2751 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2752 name, namelen, dir->i_ino, &key,
2753 BTRFS_FT_DIR);
2754 if (ret)
2755 goto fail;
2756
2757 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2758 name, namelen, objectid,
2759 root->fs_info->sb->s_root->d_inode->i_ino);
2760 if (ret)
2761 goto fail;
2762
2763 ret = btrfs_commit_transaction(trans, root);
2764 if (ret)
2765 goto fail_commit;
2766
2767 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2768 BUG_ON(!new_root);
2769
2770 trans = btrfs_start_transaction(new_root, 1);
2771 BUG_ON(!trans);
2772
2773 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2774 new_dirid,
2775 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2776 if (IS_ERR(inode))
2777 goto fail;
2778 inode->i_op = &btrfs_dir_inode_operations;
2779 inode->i_fop = &btrfs_dir_file_operations;
2780 new_root->inode = inode;
2781
2782 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2783 new_dirid);
2784 inode->i_nlink = 1;
2785 inode->i_size = 0;
2786 ret = btrfs_update_inode(trans, new_root, inode);
2787 if (ret)
2788 goto fail;
2789
2790 /* Invalidate existing dcache entry for new subvolume. */
2791 btrfs_invalidate_dcache_root(root, name, namelen);
2792
2793 fail:
2794 nr = trans->blocks_used;
2795 err = btrfs_commit_transaction(trans, new_root);
2796 if (err && !ret)
2797 ret = err;
2798 fail_commit:
2799 mutex_unlock(&root->fs_info->fs_mutex);
2800 btrfs_btree_balance_dirty(root, nr);
2801 btrfs_throttle(root);
2802 return ret;
2803 }
2804
2805 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2806 {
2807 struct btrfs_pending_snapshot *pending_snapshot;
2808 struct btrfs_trans_handle *trans;
2809 int ret;
2810 int err;
2811 unsigned long nr = 0;
2812
2813 if (!root->ref_cows)
2814 return -EINVAL;
2815
2816 mutex_lock(&root->fs_info->fs_mutex);
2817 ret = btrfs_check_free_space(root, 1, 0);
2818 if (ret)
2819 goto fail_unlock;
2820
2821 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2822 if (!pending_snapshot) {
2823 ret = -ENOMEM;
2824 goto fail_unlock;
2825 }
2826 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
2827 if (!pending_snapshot->name) {
2828 ret = -ENOMEM;
2829 kfree(pending_snapshot);
2830 goto fail_unlock;
2831 }
2832 memcpy(pending_snapshot->name, name, namelen);
2833 pending_snapshot->name[namelen] = '\0';
2834 trans = btrfs_start_transaction(root, 1);
2835 BUG_ON(!trans);
2836 pending_snapshot->root = root;
2837 list_add(&pending_snapshot->list,
2838 &trans->transaction->pending_snapshots);
2839 ret = btrfs_update_inode(trans, root, root->inode);
2840 err = btrfs_commit_transaction(trans, root);
2841
2842 fail_unlock:
2843 mutex_unlock(&root->fs_info->fs_mutex);
2844 btrfs_btree_balance_dirty(root, nr);
2845 btrfs_throttle(root);
2846 return ret;
2847 }
2848
2849 unsigned long btrfs_force_ra(struct address_space *mapping,
2850 struct file_ra_state *ra, struct file *file,
2851 pgoff_t offset, pgoff_t last_index)
2852 {
2853 pgoff_t req_size = last_index - offset + 1;
2854
2855 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2856 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2857 return offset;
2858 #else
2859 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2860 return offset + req_size;
2861 #endif
2862 }
2863
2864 int btrfs_defrag_file(struct file *file) {
2865 struct inode *inode = fdentry(file)->d_inode;
2866 struct btrfs_root *root = BTRFS_I(inode)->root;
2867 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2868 struct page *page;
2869 unsigned long last_index;
2870 unsigned long ra_pages = root->fs_info->bdi.ra_pages;
2871 unsigned long total_read = 0;
2872 u64 page_start;
2873 u64 page_end;
2874 unsigned long i;
2875 int ret;
2876
2877 mutex_lock(&root->fs_info->fs_mutex);
2878 ret = btrfs_check_free_space(root, inode->i_size, 0);
2879 mutex_unlock(&root->fs_info->fs_mutex);
2880 if (ret)
2881 return -ENOSPC;
2882
2883 mutex_lock(&inode->i_mutex);
2884 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2885 for (i = 0; i <= last_index; i++) {
2886 if (total_read % ra_pages == 0) {
2887 btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
2888 min(last_index, i + ra_pages - 1));
2889 }
2890 total_read++;
2891 page = grab_cache_page(inode->i_mapping, i);
2892 if (!page)
2893 goto out_unlock;
2894 if (!PageUptodate(page)) {
2895 btrfs_readpage(NULL, page);
2896 lock_page(page);
2897 if (!PageUptodate(page)) {
2898 unlock_page(page);
2899 page_cache_release(page);
2900 goto out_unlock;
2901 }
2902 }
2903
2904 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
2905 ClearPageDirty(page);
2906 #else
2907 cancel_dirty_page(page, PAGE_CACHE_SIZE);
2908 #endif
2909 wait_on_page_writeback(page);
2910 set_page_extent_mapped(page);
2911
2912 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2913 page_end = page_start + PAGE_CACHE_SIZE - 1;
2914
2915 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
2916 set_extent_delalloc(io_tree, page_start,
2917 page_end, GFP_NOFS);
2918
2919 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
2920 set_page_dirty(page);
2921 unlock_page(page);
2922 page_cache_release(page);
2923 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2924 }
2925
2926 out_unlock:
2927 mutex_unlock(&inode->i_mutex);
2928 return 0;
2929 }
2930
2931 static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2932 {
2933 u64 new_size;
2934 u64 old_size;
2935 u64 devid = 1;
2936 struct btrfs_ioctl_vol_args *vol_args;
2937 struct btrfs_trans_handle *trans;
2938 struct btrfs_device *device = NULL;
2939 char *sizestr;
2940 char *devstr = NULL;
2941 int ret = 0;
2942 int namelen;
2943 int mod = 0;
2944
2945 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2946
2947 if (!vol_args)
2948 return -ENOMEM;
2949
2950 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2951 ret = -EFAULT;
2952 goto out;
2953 }
2954 namelen = strlen(vol_args->name);
2955 if (namelen > BTRFS_VOL_NAME_MAX) {
2956 ret = -EINVAL;
2957 goto out;
2958 }
2959
2960 mutex_lock(&root->fs_info->fs_mutex);
2961 sizestr = vol_args->name;
2962 devstr = strchr(sizestr, ':');
2963 if (devstr) {
2964 char *end;
2965 sizestr = devstr + 1;
2966 *devstr = '\0';
2967 devstr = vol_args->name;
2968 devid = simple_strtoull(devstr, &end, 10);
2969 printk("resizing devid %Lu\n", devid);
2970 }
2971 device = btrfs_find_device(root, devid, NULL);
2972 if (!device) {
2973 printk("resizer unable to find device %Lu\n", devid);
2974 ret = -EINVAL;
2975 goto out_unlock;
2976 }
2977 if (!strcmp(sizestr, "max"))
2978 new_size = device->bdev->bd_inode->i_size;
2979 else {
2980 if (sizestr[0] == '-') {
2981 mod = -1;
2982 sizestr++;
2983 } else if (sizestr[0] == '+') {
2984 mod = 1;
2985 sizestr++;
2986 }
2987 new_size = btrfs_parse_size(sizestr);
2988 if (new_size == 0) {
2989 ret = -EINVAL;
2990 goto out_unlock;
2991 }
2992 }
2993
2994 old_size = device->total_bytes;
2995
2996 if (mod < 0) {
2997 if (new_size > old_size) {
2998 ret = -EINVAL;
2999 goto out_unlock;
3000 }
3001 new_size = old_size - new_size;
3002 } else if (mod > 0) {
3003 new_size = old_size + new_size;
3004 }
3005
3006 if (new_size < 256 * 1024 * 1024) {
3007 ret = -EINVAL;
3008 goto out_unlock;
3009 }
3010 if (new_size > device->bdev->bd_inode->i_size) {
3011 ret = -EFBIG;
3012 goto out_unlock;
3013 }
3014
3015 do_div(new_size, root->sectorsize);
3016 new_size *= root->sectorsize;
3017
3018 printk("new size for %s is %llu\n", device->name, (unsigned long long)new_size);
3019
3020 if (new_size > old_size) {
3021 trans = btrfs_start_transaction(root, 1);
3022 ret = btrfs_grow_device(trans, device, new_size);
3023 btrfs_commit_transaction(trans, root);
3024 } else {
3025 ret = btrfs_shrink_device(device, new_size);
3026 }
3027
3028 out_unlock:
3029 mutex_unlock(&root->fs_info->fs_mutex);
3030 out:
3031 kfree(vol_args);
3032 return ret;
3033 }
3034
3035 static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
3036 void __user *arg)
3037 {
3038 struct btrfs_ioctl_vol_args *vol_args;
3039 struct btrfs_dir_item *di;
3040 struct btrfs_path *path;
3041 u64 root_dirid;
3042 int namelen;
3043 int ret;
3044
3045 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
3046
3047 if (!vol_args)
3048 return -ENOMEM;
3049
3050 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3051 ret = -EFAULT;
3052 goto out;
3053 }
3054
3055 namelen = strlen(vol_args->name);
3056 if (namelen > BTRFS_VOL_NAME_MAX) {
3057 ret = -EINVAL;
3058 goto out;
3059 }
3060 if (strchr(vol_args->name, '/')) {
3061 ret = -EINVAL;
3062 goto out;
3063 }
3064
3065 path = btrfs_alloc_path();
3066 if (!path) {
3067 ret = -ENOMEM;
3068 goto out;
3069 }
3070
3071 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
3072 mutex_lock(&root->fs_info->fs_mutex);
3073 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
3074 path, root_dirid,
3075 vol_args->name, namelen, 0);
3076 mutex_unlock(&root->fs_info->fs_mutex);
3077 btrfs_free_path(path);
3078
3079 if (di && !IS_ERR(di)) {
3080 ret = -EEXIST;
3081 goto out;
3082 }
3083
3084 if (IS_ERR(di)) {
3085 ret = PTR_ERR(di);
3086 goto out;
3087 }
3088
3089 if (root == root->fs_info->tree_root)
3090 ret = create_subvol(root, vol_args->name, namelen);
3091 else
3092 ret = create_snapshot(root, vol_args->name, namelen);
3093 out:
3094 kfree(vol_args);
3095 return ret;
3096 }
3097
3098 static int btrfs_ioctl_defrag(struct file *file)
3099 {
3100 struct inode *inode = fdentry(file)->d_inode;
3101 struct btrfs_root *root = BTRFS_I(inode)->root;
3102
3103 switch (inode->i_mode & S_IFMT) {
3104 case S_IFDIR:
3105 mutex_lock(&root->fs_info->fs_mutex);
3106 btrfs_defrag_root(root, 0);
3107 btrfs_defrag_root(root->fs_info->extent_root, 0);
3108 mutex_unlock(&root->fs_info->fs_mutex);
3109 break;
3110 case S_IFREG:
3111 btrfs_defrag_file(file);
3112 break;
3113 }
3114
3115 return 0;
3116 }
3117
3118 long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
3119 {
3120 struct btrfs_ioctl_vol_args *vol_args;
3121 int ret;
3122
3123 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
3124
3125 if (!vol_args)
3126 return -ENOMEM;
3127
3128 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3129 ret = -EFAULT;
3130 goto out;
3131 }
3132 ret = btrfs_init_new_device(root, vol_args->name);
3133
3134 out:
3135 kfree(vol_args);
3136 return ret;
3137 }
3138
3139 long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
3140 {
3141 struct btrfs_ioctl_vol_args *vol_args;
3142 int ret;
3143
3144 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
3145
3146 if (!vol_args)
3147 return -ENOMEM;
3148
3149 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3150 ret = -EFAULT;
3151 goto out;
3152 }
3153 ret = btrfs_rm_device(root, vol_args->name);
3154
3155 out:
3156 kfree(vol_args);
3157 return ret;
3158 }
3159
3160 int dup_item_to_inode(struct btrfs_trans_handle *trans,
3161 struct btrfs_root *root,
3162 struct btrfs_path *path,
3163 struct extent_buffer *leaf,
3164 int slot,
3165 struct btrfs_key *key,
3166 u64 destino)
3167 {
3168 char *dup;
3169 int len = btrfs_item_size_nr(leaf, slot);
3170 struct btrfs_key ckey = *key;
3171 int ret = 0;
3172
3173 dup = kmalloc(len, GFP_NOFS);
3174 if (!dup)
3175 return -ENOMEM;
3176
3177 read_extent_buffer(leaf, dup, btrfs_item_ptr_offset(leaf, slot), len);
3178 btrfs_release_path(root, path);
3179
3180 ckey.objectid = destino;
3181 ret = btrfs_insert_item(trans, root, &ckey, dup, len);
3182 kfree(dup);
3183 return ret;
3184 }
3185
3186 long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
3187 {
3188 struct inode *inode = fdentry(file)->d_inode;
3189 struct btrfs_root *root = BTRFS_I(inode)->root;
3190 struct file *src_file;
3191 struct inode *src;
3192 struct btrfs_trans_handle *trans;
3193 int ret;
3194 u64 pos;
3195 struct btrfs_path *path;
3196 struct btrfs_key key;
3197 struct extent_buffer *leaf;
3198 u32 nritems;
3199 int slot;
3200
3201 src_file = fget(src_fd);
3202 if (!src_file)
3203 return -EBADF;
3204 src = src_file->f_dentry->d_inode;
3205
3206 ret = -EXDEV;
3207 if (src->i_sb != inode->i_sb)
3208 goto out_fput;
3209
3210 if (inode < src) {
3211 mutex_lock(&inode->i_mutex);
3212 mutex_lock(&src->i_mutex);
3213 } else {
3214 mutex_lock(&src->i_mutex);
3215 mutex_lock(&inode->i_mutex);
3216 }
3217
3218 ret = -ENOTEMPTY;
3219 if (inode->i_size)
3220 goto out_unlock;
3221
3222 /* do any pending delalloc/csum calc on src, one way or
3223 another, and lock file content */
3224 while (1) {
3225 filemap_write_and_wait(src->i_mapping);
3226 lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
3227 if (BTRFS_I(src)->delalloc_bytes == 0)
3228 break;
3229 unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
3230 }
3231
3232 mutex_lock(&root->fs_info->fs_mutex);
3233 trans = btrfs_start_transaction(root, 0);
3234 path = btrfs_alloc_path();
3235 if (!path) {
3236 ret = -ENOMEM;
3237 goto out;
3238 }
3239 key.offset = 0;
3240 key.type = BTRFS_EXTENT_DATA_KEY;
3241 key.objectid = src->i_ino;
3242 pos = 0;
3243 path->reada = 2;
3244
3245 while (1) {
3246 /*
3247 * note the key will change type as we walk through the
3248 * tree.
3249 */
3250 ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
3251 if (ret < 0)
3252 goto out;
3253
3254 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3255 ret = btrfs_next_leaf(root, path);
3256 if (ret < 0)
3257 goto out;
3258 if (ret > 0)
3259 break;
3260 }
3261 leaf = path->nodes[0];
3262 slot = path->slots[0];
3263 btrfs_item_key_to_cpu(leaf, &key, slot);
3264 nritems = btrfs_header_nritems(leaf);
3265
3266 if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY ||
3267 key.objectid != src->i_ino)
3268 break;
3269
3270 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
3271 struct btrfs_file_extent_item *extent;
3272 int found_type;
3273 pos = key.offset;
3274 extent = btrfs_item_ptr(leaf, slot,
3275 struct btrfs_file_extent_item);
3276 found_type = btrfs_file_extent_type(leaf, extent);
3277 if (found_type == BTRFS_FILE_EXTENT_REG) {
3278 u64 len = btrfs_file_extent_num_bytes(leaf,
3279 extent);
3280 u64 ds = btrfs_file_extent_disk_bytenr(leaf,
3281 extent);
3282 u64 dl = btrfs_file_extent_disk_num_bytes(leaf,
3283 extent);
3284 u64 off = btrfs_file_extent_offset(leaf,
3285 extent);
3286 btrfs_insert_file_extent(trans, root,
3287 inode->i_ino, pos,
3288 ds, dl, len, off);
3289 /* ds == 0 means there's a hole */
3290 if (ds != 0) {
3291 btrfs_inc_extent_ref(trans, root,
3292 ds, dl,
3293 root->root_key.objectid,
3294 trans->transid,
3295 inode->i_ino, pos);
3296 }
3297 pos = key.offset + len;
3298 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
3299 ret = dup_item_to_inode(trans, root, path,
3300 leaf, slot, &key,
3301 inode->i_ino);
3302 if (ret)
3303 goto out;
3304 pos = key.offset + btrfs_item_size_nr(leaf,
3305 slot);
3306 }
3307 } else if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
3308 ret = dup_item_to_inode(trans, root, path, leaf,
3309 slot, &key, inode->i_ino);
3310
3311 if (ret)
3312 goto out;
3313 }
3314 key.offset++;
3315 btrfs_release_path(root, path);
3316 }
3317
3318 ret = 0;
3319 out:
3320 btrfs_free_path(path);
3321
3322 inode->i_blocks = src->i_blocks;
3323 i_size_write(inode, src->i_size);
3324 btrfs_update_inode(trans, root, inode);
3325
3326 unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
3327
3328 btrfs_end_transaction(trans, root);
3329 mutex_unlock(&root->fs_info->fs_mutex);
3330
3331 out_unlock:
3332 mutex_unlock(&src->i_mutex);
3333 mutex_unlock(&inode->i_mutex);
3334 out_fput:
3335 fput(src_file);
3336 return ret;
3337 }
3338
3339 long btrfs_ioctl(struct file *file, unsigned int
3340 cmd, unsigned long arg)
3341 {
3342 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3343
3344 switch (cmd) {
3345 case BTRFS_IOC_SNAP_CREATE:
3346 return btrfs_ioctl_snap_create(root, (void __user *)arg);
3347 case BTRFS_IOC_DEFRAG:
3348 return btrfs_ioctl_defrag(file);
3349 case BTRFS_IOC_RESIZE:
3350 return btrfs_ioctl_resize(root, (void __user *)arg);
3351 case BTRFS_IOC_ADD_DEV:
3352 return btrfs_ioctl_add_dev(root, (void __user *)arg);
3353 case BTRFS_IOC_RM_DEV:
3354 return btrfs_ioctl_rm_dev(root, (void __user *)arg);
3355 case BTRFS_IOC_BALANCE:
3356 return btrfs_balance(root->fs_info->dev_root);
3357 case BTRFS_IOC_CLONE:
3358 return btrfs_ioctl_clone(file, arg);
3359 }
3360
3361 return -ENOTTY;
3362 }
3363
3364 /*
3365 * Called inside transaction, so use GFP_NOFS
3366 */
3367 struct inode *btrfs_alloc_inode(struct super_block *sb)
3368 {
3369 struct btrfs_inode *ei;
3370
3371 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
3372 if (!ei)
3373 return NULL;
3374 ei->last_trans = 0;
3375 ei->ordered_trans = 0;
3376 return &ei->vfs_inode;
3377 }
3378
3379 void btrfs_destroy_inode(struct inode *inode)
3380 {
3381 WARN_ON(!list_empty(&inode->i_dentry));
3382 WARN_ON(inode->i_data.nrpages);
3383
3384 btrfs_drop_extent_cache(inode, 0, (u64)-1);
3385 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
3386 }
3387
3388 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3389 static void init_once(struct kmem_cache * cachep, void *foo)
3390 #else
3391 static void init_once(void * foo, struct kmem_cache * cachep,
3392 unsigned long flags)
3393 #endif
3394 {
3395 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
3396
3397 inode_init_once(&ei->vfs_inode);
3398 }
3399
3400 void btrfs_destroy_cachep(void)
3401 {
3402 if (btrfs_inode_cachep)
3403 kmem_cache_destroy(btrfs_inode_cachep);
3404 if (btrfs_trans_handle_cachep)
3405 kmem_cache_destroy(btrfs_trans_handle_cachep);
3406 if (btrfs_transaction_cachep)
3407 kmem_cache_destroy(btrfs_transaction_cachep);
3408 if (btrfs_bit_radix_cachep)
3409 kmem_cache_destroy(btrfs_bit_radix_cachep);
3410 if (btrfs_path_cachep)
3411 kmem_cache_destroy(btrfs_path_cachep);
3412 }
3413
3414 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
3415 unsigned long extra_flags,
3416 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3417 void (*ctor)(struct kmem_cache *, void *)
3418 #else
3419 void (*ctor)(void *, struct kmem_cache *,
3420 unsigned long)
3421 #endif
3422 )
3423 {
3424 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
3425 SLAB_MEM_SPREAD | extra_flags), ctor
3426 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
3427 ,NULL
3428 #endif
3429 );
3430 }
3431
3432 int btrfs_init_cachep(void)
3433 {
3434 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
3435 sizeof(struct btrfs_inode),
3436 0, init_once);
3437 if (!btrfs_inode_cachep)
3438 goto fail;
3439 btrfs_trans_handle_cachep =
3440 btrfs_cache_create("btrfs_trans_handle_cache",
3441 sizeof(struct btrfs_trans_handle),
3442 0, NULL);
3443 if (!btrfs_trans_handle_cachep)
3444 goto fail;
3445 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
3446 sizeof(struct btrfs_transaction),
3447 0, NULL);
3448 if (!btrfs_transaction_cachep)
3449 goto fail;
3450 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
3451 sizeof(struct btrfs_path),
3452 0, NULL);
3453 if (!btrfs_path_cachep)
3454 goto fail;
3455 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
3456 SLAB_DESTROY_BY_RCU, NULL);
3457 if (!btrfs_bit_radix_cachep)
3458 goto fail;
3459 return 0;
3460 fail:
3461 btrfs_destroy_cachep();
3462 return -ENOMEM;
3463 }
3464
3465 static int btrfs_getattr(struct vfsmount *mnt,
3466 struct dentry *dentry, struct kstat *stat)
3467 {
3468 struct inode *inode = dentry->d_inode;
3469 generic_fillattr(inode, stat);
3470 stat->blksize = PAGE_CACHE_SIZE;
3471 stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9);
3472 return 0;
3473 }
3474
3475 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
3476 struct inode * new_dir,struct dentry *new_dentry)
3477 {
3478 struct btrfs_trans_handle *trans;
3479 struct btrfs_root *root = BTRFS_I(old_dir)->root;
3480 struct inode *new_inode = new_dentry->d_inode;
3481 struct inode *old_inode = old_dentry->d_inode;
3482 struct timespec ctime = CURRENT_TIME;
3483 struct btrfs_path *path;
3484 int ret;
3485
3486 if (S_ISDIR(old_inode->i_mode) && new_inode &&
3487 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
3488 return -ENOTEMPTY;
3489 }
3490
3491 mutex_lock(&root->fs_info->fs_mutex);
3492 ret = btrfs_check_free_space(root, 1, 0);
3493 if (ret)
3494 goto out_unlock;
3495
3496 trans = btrfs_start_transaction(root, 1);
3497
3498 btrfs_set_trans_block_group(trans, new_dir);
3499 path = btrfs_alloc_path();
3500 if (!path) {
3501 ret = -ENOMEM;
3502 goto out_fail;
3503 }
3504
3505 old_dentry->d_inode->i_nlink++;
3506 old_dir->i_ctime = old_dir->i_mtime = ctime;
3507 new_dir->i_ctime = new_dir->i_mtime = ctime;
3508 old_inode->i_ctime = ctime;
3509
3510 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
3511 if (ret)
3512 goto out_fail;
3513
3514 if (new_inode) {
3515 new_inode->i_ctime = CURRENT_TIME;
3516 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
3517 if (ret)
3518 goto out_fail;
3519 }
3520 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
3521 if (ret)
3522 goto out_fail;
3523
3524 out_fail:
3525 btrfs_free_path(path);
3526 btrfs_end_transaction(trans, root);
3527 out_unlock:
3528 mutex_unlock(&root->fs_info->fs_mutex);
3529 return ret;
3530 }
3531
3532 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
3533 const char *symname)
3534 {
3535 struct btrfs_trans_handle *trans;
3536 struct btrfs_root *root = BTRFS_I(dir)->root;
3537 struct btrfs_path *path;
3538 struct btrfs_key key;
3539 struct inode *inode = NULL;
3540 int err;
3541 int drop_inode = 0;
3542 u64 objectid;
3543 int name_len;
3544 int datasize;
3545 unsigned long ptr;
3546 struct btrfs_file_extent_item *ei;
3547 struct extent_buffer *leaf;
3548 unsigned long nr = 0;
3549
3550 name_len = strlen(symname) + 1;
3551 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
3552 return -ENAMETOOLONG;
3553
3554 mutex_lock(&root->fs_info->fs_mutex);
3555 err = btrfs_check_free_space(root, 1, 0);
3556 if (err)
3557 goto out_fail;
3558
3559 trans = btrfs_start_transaction(root, 1);
3560 btrfs_set_trans_block_group(trans, dir);
3561
3562 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
3563 if (err) {
3564 err = -ENOSPC;
3565 goto out_unlock;
3566 }
3567
3568 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
3569 dentry->d_name.len,
3570 dentry->d_parent->d_inode->i_ino, objectid,
3571 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
3572 err = PTR_ERR(inode);
3573 if (IS_ERR(inode))
3574 goto out_unlock;
3575
3576 btrfs_set_trans_block_group(trans, inode);
3577 err = btrfs_add_nondir(trans, dentry, inode, 0);
3578 if (err)
3579 drop_inode = 1;
3580 else {
3581 inode->i_mapping->a_ops = &btrfs_aops;
3582 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
3583 inode->i_fop = &btrfs_file_operations;
3584 inode->i_op = &btrfs_file_inode_operations;
3585 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
3586 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
3587 inode->i_mapping, GFP_NOFS);
3588 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
3589 inode->i_mapping, GFP_NOFS);
3590 BTRFS_I(inode)->delalloc_bytes = 0;
3591 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
3592 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
3593 }
3594 dir->i_sb->s_dirt = 1;
3595 btrfs_update_inode_block_group(trans, inode);
3596 btrfs_update_inode_block_group(trans, dir);
3597 if (drop_inode)
3598 goto out_unlock;
3599
3600 path = btrfs_alloc_path();
3601 BUG_ON(!path);
3602 key.objectid = inode->i_ino;
3603 key.offset = 0;
3604 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
3605 datasize = btrfs_file_extent_calc_inline_size(name_len);
3606 err = btrfs_insert_empty_item(trans, root, path, &key,
3607 datasize);
3608 if (err) {
3609 drop_inode = 1;
3610 goto out_unlock;
3611 }
3612 leaf = path->nodes[0];
3613 ei = btrfs_item_ptr(leaf, path->slots[0],
3614 struct btrfs_file_extent_item);
3615 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
3616 btrfs_set_file_extent_type(leaf, ei,
3617 BTRFS_FILE_EXTENT_INLINE);
3618 ptr = btrfs_file_extent_inline_start(ei);
3619 write_extent_buffer(leaf, symname, ptr, name_len);
3620 btrfs_mark_buffer_dirty(leaf);
3621 btrfs_free_path(path);
3622
3623 inode->i_op = &btrfs_symlink_inode_operations;
3624 inode->i_mapping->a_ops = &btrfs_symlink_aops;
3625 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
3626 inode->i_size = name_len - 1;
3627 err = btrfs_update_inode(trans, root, inode);
3628 if (err)
3629 drop_inode = 1;
3630
3631 out_unlock:
3632 nr = trans->blocks_used;
3633 btrfs_end_transaction(trans, root);
3634 out_fail:
3635 mutex_unlock(&root->fs_info->fs_mutex);
3636 if (drop_inode) {
3637 inode_dec_link_count(inode);
3638 iput(inode);
3639 }
3640 btrfs_btree_balance_dirty(root, nr);
3641 btrfs_throttle(root);
3642 return err;
3643 }
3644
3645 static int btrfs_permission(struct inode *inode, int mask,
3646 struct nameidata *nd)
3647 {
3648 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
3649 return -EACCES;
3650 return generic_permission(inode, mask, NULL);
3651 }
3652
3653 static struct inode_operations btrfs_dir_inode_operations = {
3654 .lookup = btrfs_lookup,
3655 .create = btrfs_create,
3656 .unlink = btrfs_unlink,
3657 .link = btrfs_link,
3658 .mkdir = btrfs_mkdir,
3659 .rmdir = btrfs_rmdir,
3660 .rename = btrfs_rename,
3661 .symlink = btrfs_symlink,
3662 .setattr = btrfs_setattr,
3663 .mknod = btrfs_mknod,
3664 .setxattr = generic_setxattr,
3665 .getxattr = generic_getxattr,
3666 .listxattr = btrfs_listxattr,
3667 .removexattr = generic_removexattr,
3668 .permission = btrfs_permission,
3669 };
3670 static struct inode_operations btrfs_dir_ro_inode_operations = {
3671 .lookup = btrfs_lookup,
3672 .permission = btrfs_permission,
3673 };
3674 static struct file_operations btrfs_dir_file_operations = {
3675 .llseek = generic_file_llseek,
3676 .read = generic_read_dir,
3677 .readdir = btrfs_readdir,
3678 .unlocked_ioctl = btrfs_ioctl,
3679 #ifdef CONFIG_COMPAT
3680 .compat_ioctl = btrfs_ioctl,
3681 #endif
3682 };
3683
3684 static struct extent_io_ops btrfs_extent_io_ops = {
3685 .fill_delalloc = run_delalloc_range,
3686 .submit_bio_hook = btrfs_submit_bio_hook,
3687 .merge_bio_hook = btrfs_merge_bio_hook,
3688 .readpage_io_hook = btrfs_readpage_io_hook,
3689 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
3690 .readpage_io_failed_hook = btrfs_io_failed_hook,
3691 .set_bit_hook = btrfs_set_bit_hook,
3692 .clear_bit_hook = btrfs_clear_bit_hook,
3693 };
3694
3695 static struct address_space_operations btrfs_aops = {
3696 .readpage = btrfs_readpage,
3697 .writepage = btrfs_writepage,
3698 .writepages = btrfs_writepages,
3699 .readpages = btrfs_readpages,
3700 .sync_page = block_sync_page,
3701 .bmap = btrfs_bmap,
3702 .direct_IO = btrfs_direct_IO,
3703 .invalidatepage = btrfs_invalidatepage,
3704 .releasepage = btrfs_releasepage,
3705 .set_page_dirty = __set_page_dirty_nobuffers,
3706 };
3707
3708 static struct address_space_operations btrfs_symlink_aops = {
3709 .readpage = btrfs_readpage,
3710 .writepage = btrfs_writepage,
3711 .invalidatepage = btrfs_invalidatepage,
3712 .releasepage = btrfs_releasepage,
3713 };
3714
3715 static struct inode_operations btrfs_file_inode_operations = {
3716 .truncate = btrfs_truncate,
3717 .getattr = btrfs_getattr,
3718 .setattr = btrfs_setattr,
3719 .setxattr = generic_setxattr,
3720 .getxattr = generic_getxattr,
3721 .listxattr = btrfs_listxattr,
3722 .removexattr = generic_removexattr,
3723 .permission = btrfs_permission,
3724 };
3725 static struct inode_operations btrfs_special_inode_operations = {
3726 .getattr = btrfs_getattr,
3727 .setattr = btrfs_setattr,
3728 .permission = btrfs_permission,
3729 };
3730 static struct inode_operations btrfs_symlink_inode_operations = {
3731 .readlink = generic_readlink,
3732 .follow_link = page_follow_link_light,
3733 .put_link = page_put_link,
3734 .permission = btrfs_permission,
3735 };
Linux kernel - Deliverables
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