2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
19 #include <linux/bio.h>
20 #include <linux/buffer_head.h>
22 #include <linux/pagemap.h>
23 #include <linux/highmem.h>
24 #include <linux/time.h>
25 #include <linux/init.h>
26 #include <linux/string.h>
27 #include <linux/smp_lock.h>
28 #include <linux/backing-dev.h>
29 #include <linux/mpage.h>
30 #include <linux/swap.h>
31 #include <linux/writeback.h>
32 #include <linux/statfs.h>
33 #include <linux/compat.h>
34 #include <linux/bit_spinlock.h>
35 #include <linux/version.h>
36 #include <linux/xattr.h>
39 #include "transaction.h"
40 #include "btrfs_inode.h"
42 #include "print-tree.h"
45 struct btrfs_iget_args {
47 struct btrfs_root *root;
50 static struct inode_operations btrfs_dir_inode_operations;
51 static struct inode_operations btrfs_symlink_inode_operations;
52 static struct inode_operations btrfs_dir_ro_inode_operations;
53 static struct inode_operations btrfs_special_inode_operations;
54 static struct inode_operations btrfs_file_inode_operations;
55 static struct address_space_operations btrfs_aops;
56 static struct address_space_operations btrfs_symlink_aops;
57 static struct file_operations btrfs_dir_file_operations;
58 static struct extent_io_ops btrfs_extent_io_ops;
60 static struct kmem_cache *btrfs_inode_cachep;
61 struct kmem_cache *btrfs_trans_handle_cachep;
62 struct kmem_cache *btrfs_transaction_cachep;
63 struct kmem_cache *btrfs_bit_radix_cachep;
64 struct kmem_cache *btrfs_path_cachep;
67 static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
68 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
69 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
70 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
71 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
72 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
73 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
74 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
77 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
80 u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
81 u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
92 spin_lock(&root->fs_info->delalloc_lock);
93 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
95 spin_unlock(&root->fs_info->delalloc_lock);
99 static int cow_file_range(struct inode *inode, u64 start, u64 end)
101 struct btrfs_root *root = BTRFS_I(inode)->root;
102 struct btrfs_trans_handle *trans;
106 u64 blocksize = root->sectorsize;
107 u64 orig_start = start;
109 struct btrfs_key ins;
112 trans = btrfs_start_transaction(root, 1);
114 btrfs_set_trans_block_group(trans, inode);
116 num_bytes = (end - start + blocksize) & ~(blocksize - 1);
117 num_bytes = max(blocksize, num_bytes);
118 ret = btrfs_drop_extents(trans, root, inode,
119 start, start + num_bytes, start, &alloc_hint);
120 orig_num_bytes = num_bytes;
122 if (alloc_hint == EXTENT_MAP_INLINE)
125 BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy));
127 while(num_bytes > 0) {
128 cur_alloc_size = min(num_bytes, root->fs_info->max_extent);
129 ret = btrfs_alloc_extent(trans, root, cur_alloc_size,
131 root->root_key.objectid,
133 inode->i_ino, start, 0,
134 alloc_hint, (u64)-1, &ins, 1);
139 cur_alloc_size = ins.offset;
140 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
141 start, ins.objectid, ins.offset,
143 inode->i_blocks += ins.offset >> 9;
144 btrfs_check_file(root, inode);
145 if (num_bytes < cur_alloc_size) {
146 printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes,
150 num_bytes -= cur_alloc_size;
151 alloc_hint = ins.objectid + ins.offset;
152 start += cur_alloc_size;
154 btrfs_drop_extent_cache(inode, orig_start,
155 orig_start + orig_num_bytes - 1);
156 btrfs_add_ordered_inode(inode);
157 btrfs_update_inode(trans, root, inode);
159 btrfs_end_transaction(trans, root);
163 static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
171 struct btrfs_root *root = BTRFS_I(inode)->root;
172 struct extent_buffer *leaf;
174 struct btrfs_path *path;
175 struct btrfs_file_extent_item *item;
178 struct btrfs_key found_key;
180 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
181 path = btrfs_alloc_path();
184 ret = btrfs_lookup_file_extent(NULL, root, path,
185 inode->i_ino, start, 0);
187 btrfs_free_path(path);
193 if (path->slots[0] == 0)
198 leaf = path->nodes[0];
199 item = btrfs_item_ptr(leaf, path->slots[0],
200 struct btrfs_file_extent_item);
202 /* are we inside the extent that was found? */
203 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
204 found_type = btrfs_key_type(&found_key);
205 if (found_key.objectid != inode->i_ino ||
206 found_type != BTRFS_EXTENT_DATA_KEY) {
210 found_type = btrfs_file_extent_type(leaf, item);
211 extent_start = found_key.offset;
212 if (found_type == BTRFS_FILE_EXTENT_REG) {
213 u64 extent_num_bytes;
215 extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
216 extent_end = extent_start + extent_num_bytes;
219 if (loops && start != extent_start)
222 if (start < extent_start || start >= extent_end)
225 cow_end = min(end, extent_end - 1);
226 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
231 * we may be called by the resizer, make sure we're inside
232 * the limits of the FS
234 if (bytenr + extent_num_bytes > total_fs_bytes)
237 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
247 btrfs_free_path(path);
250 btrfs_release_path(root, path);
255 cow_file_range(inode, start, cow_end);
260 static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
262 struct btrfs_root *root = BTRFS_I(inode)->root;
264 mutex_lock(&root->fs_info->fs_mutex);
265 if (btrfs_test_opt(root, NODATACOW) ||
266 btrfs_test_flag(inode, NODATACOW))
267 ret = run_delalloc_nocow(inode, start, end);
269 ret = cow_file_range(inode, start, end);
271 mutex_unlock(&root->fs_info->fs_mutex);
275 int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
276 unsigned long old, unsigned long bits)
278 if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
279 struct btrfs_root *root = BTRFS_I(inode)->root;
280 spin_lock(&root->fs_info->delalloc_lock);
281 BTRFS_I(inode)->delalloc_bytes += end - start + 1;
282 root->fs_info->delalloc_bytes += end - start + 1;
283 spin_unlock(&root->fs_info->delalloc_lock);
288 int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
289 unsigned long old, unsigned long bits)
291 if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
292 struct btrfs_root *root = BTRFS_I(inode)->root;
293 spin_lock(&root->fs_info->delalloc_lock);
294 if (end - start + 1 > root->fs_info->delalloc_bytes) {
295 printk("warning: delalloc account %Lu %Lu\n",
296 end - start + 1, root->fs_info->delalloc_bytes);
297 root->fs_info->delalloc_bytes = 0;
298 BTRFS_I(inode)->delalloc_bytes = 0;
300 root->fs_info->delalloc_bytes -= end - start + 1;
301 BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
303 spin_unlock(&root->fs_info->delalloc_lock);
308 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
309 size_t size, struct bio *bio)
311 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
312 struct btrfs_mapping_tree *map_tree;
313 u64 logical = bio->bi_sector << 9;
316 struct bio_vec *bvec;
320 bio_for_each_segment(bvec, bio, i) {
321 length += bvec->bv_len;
323 map_tree = &root->fs_info->mapping_tree;
325 ret = btrfs_map_block(map_tree, READ, logical,
326 &map_length, NULL, 0);
328 if (map_length < length + size) {
334 int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
337 struct btrfs_root *root = BTRFS_I(inode)->root;
338 struct btrfs_trans_handle *trans;
342 ret = btrfs_csum_one_bio(root, bio, &sums);
345 mutex_lock(&root->fs_info->fs_mutex);
346 trans = btrfs_start_transaction(root, 1);
348 btrfs_set_trans_block_group(trans, inode);
349 btrfs_csum_file_blocks(trans, root, inode, bio, sums);
351 ret = btrfs_end_transaction(trans, root);
353 mutex_unlock(&root->fs_info->fs_mutex);
357 return btrfs_map_bio(root, rw, bio, mirror_num);
360 int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
363 struct btrfs_root *root = BTRFS_I(inode)->root;
366 if (!(rw & (1 << BIO_RW))) {
367 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
372 if (btrfs_test_opt(root, NODATASUM) ||
373 btrfs_test_flag(inode, NODATASUM)) {
377 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
378 inode, rw, bio, mirror_num,
379 __btrfs_submit_bio_hook);
381 return btrfs_map_bio(root, rw, bio, mirror_num);
384 int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
387 struct inode *inode = page->mapping->host;
388 struct btrfs_root *root = BTRFS_I(inode)->root;
389 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
390 struct btrfs_csum_item *item;
391 struct btrfs_path *path = NULL;
394 if (btrfs_test_opt(root, NODATASUM) ||
395 btrfs_test_flag(inode, NODATASUM))
398 mutex_lock(&root->fs_info->fs_mutex);
399 path = btrfs_alloc_path();
400 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
403 /* a csum that isn't present is a preallocated region. */
404 if (ret == -ENOENT || ret == -EFBIG)
407 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
410 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
412 set_state_private(io_tree, start, csum);
415 btrfs_free_path(path);
416 mutex_unlock(&root->fs_info->fs_mutex);
420 struct io_failure_record {
428 int btrfs_readpage_io_failed_hook(struct bio *failed_bio,
429 struct page *page, u64 start, u64 end,
430 struct extent_state *state)
432 struct io_failure_record *failrec = NULL;
434 struct extent_map *em;
435 struct inode *inode = page->mapping->host;
436 struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
437 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
443 ret = get_state_private(failure_tree, start, &private);
445 failrec = kmalloc(sizeof(*failrec), GFP_NOFS);
448 failrec->start = start;
449 failrec->len = end - start + 1;
450 failrec->last_mirror = 0;
452 spin_lock(&em_tree->lock);
453 em = lookup_extent_mapping(em_tree, start, failrec->len);
454 if (em->start > start || em->start + em->len < start) {
458 spin_unlock(&em_tree->lock);
460 if (!em || IS_ERR(em)) {
464 logical = start - em->start;
465 logical = em->block_start + logical;
466 failrec->logical = logical;
468 set_extent_bits(failure_tree, start, end, EXTENT_LOCKED |
469 EXTENT_DIRTY, GFP_NOFS);
470 set_state_private(failure_tree, start,
471 (u64)(unsigned long)failrec);
473 failrec = (struct io_failure_record *)(unsigned long)private;
475 num_copies = btrfs_num_copies(
476 &BTRFS_I(inode)->root->fs_info->mapping_tree,
477 failrec->logical, failrec->len);
478 failrec->last_mirror++;
480 spin_lock_irq(&BTRFS_I(inode)->io_tree.lock);
481 state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree,
484 if (state && state->start != failrec->start)
486 spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock);
488 if (!state || failrec->last_mirror > num_copies) {
489 set_state_private(failure_tree, failrec->start, 0);
490 clear_extent_bits(failure_tree, failrec->start,
491 failrec->start + failrec->len - 1,
492 EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
496 bio = bio_alloc(GFP_NOFS, 1);
497 bio->bi_private = state;
498 bio->bi_end_io = failed_bio->bi_end_io;
499 bio->bi_sector = failrec->logical >> 9;
500 bio->bi_bdev = failed_bio->bi_bdev;
501 bio_add_page(bio, page, failrec->len, start - page_offset(page));
502 btrfs_submit_bio_hook(inode, READ, bio, failrec->last_mirror);
506 int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
507 struct extent_state *state)
509 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
510 struct inode *inode = page->mapping->host;
511 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
513 u64 private = ~(u32)0;
515 struct btrfs_root *root = BTRFS_I(inode)->root;
519 if (btrfs_test_opt(root, NODATASUM) ||
520 btrfs_test_flag(inode, NODATASUM))
522 if (state && state->start == start) {
523 private = state->private;
526 ret = get_state_private(io_tree, start, &private);
528 local_irq_save(flags);
529 kaddr = kmap_atomic(page, KM_IRQ0);
533 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
534 btrfs_csum_final(csum, (char *)&csum);
535 if (csum != private) {
538 kunmap_atomic(kaddr, KM_IRQ0);
539 local_irq_restore(flags);
541 /* if the io failure tree for this inode is non-empty,
542 * check to see if we've recovered from a failed IO
545 if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private,
546 (u64)-1, 1, EXTENT_DIRTY)) {
548 struct io_failure_record *failure;
549 ret = get_state_private(&BTRFS_I(inode)->io_failure_tree,
550 start, &private_failure);
552 failure = (struct io_failure_record *)(unsigned long)
554 set_state_private(&BTRFS_I(inode)->io_failure_tree,
556 clear_extent_bits(&BTRFS_I(inode)->io_failure_tree,
558 failure->start + failure->len - 1,
559 EXTENT_DIRTY | EXTENT_LOCKED,
567 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
568 page->mapping->host->i_ino, (unsigned long long)start, csum,
570 memset(kaddr + offset, 1, end - start + 1);
571 flush_dcache_page(page);
572 kunmap_atomic(kaddr, KM_IRQ0);
573 local_irq_restore(flags);
579 void btrfs_read_locked_inode(struct inode *inode)
581 struct btrfs_path *path;
582 struct extent_buffer *leaf;
583 struct btrfs_inode_item *inode_item;
584 struct btrfs_timespec *tspec;
585 struct btrfs_root *root = BTRFS_I(inode)->root;
586 struct btrfs_key location;
587 u64 alloc_group_block;
591 path = btrfs_alloc_path();
593 mutex_lock(&root->fs_info->fs_mutex);
594 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
596 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
600 leaf = path->nodes[0];
601 inode_item = btrfs_item_ptr(leaf, path->slots[0],
602 struct btrfs_inode_item);
604 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
605 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
606 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
607 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
608 inode->i_size = btrfs_inode_size(leaf, inode_item);
610 tspec = btrfs_inode_atime(inode_item);
611 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
612 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
614 tspec = btrfs_inode_mtime(inode_item);
615 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
616 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
618 tspec = btrfs_inode_ctime(inode_item);
619 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
620 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
622 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
623 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
625 rdev = btrfs_inode_rdev(leaf, inode_item);
627 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
628 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
630 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
631 if (!BTRFS_I(inode)->block_group) {
632 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
634 BTRFS_BLOCK_GROUP_METADATA, 0);
636 btrfs_free_path(path);
639 mutex_unlock(&root->fs_info->fs_mutex);
641 switch (inode->i_mode & S_IFMT) {
643 inode->i_mapping->a_ops = &btrfs_aops;
644 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
645 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
646 inode->i_fop = &btrfs_file_operations;
647 inode->i_op = &btrfs_file_inode_operations;
650 inode->i_fop = &btrfs_dir_file_operations;
651 if (root == root->fs_info->tree_root)
652 inode->i_op = &btrfs_dir_ro_inode_operations;
654 inode->i_op = &btrfs_dir_inode_operations;
657 inode->i_op = &btrfs_symlink_inode_operations;
658 inode->i_mapping->a_ops = &btrfs_symlink_aops;
659 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
662 init_special_inode(inode, inode->i_mode, rdev);
668 btrfs_release_path(root, path);
669 btrfs_free_path(path);
670 mutex_unlock(&root->fs_info->fs_mutex);
671 make_bad_inode(inode);
674 static void fill_inode_item(struct extent_buffer *leaf,
675 struct btrfs_inode_item *item,
678 btrfs_set_inode_uid(leaf, item, inode->i_uid);
679 btrfs_set_inode_gid(leaf, item, inode->i_gid);
680 btrfs_set_inode_size(leaf, item, inode->i_size);
681 btrfs_set_inode_mode(leaf, item, inode->i_mode);
682 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
684 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
685 inode->i_atime.tv_sec);
686 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
687 inode->i_atime.tv_nsec);
689 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
690 inode->i_mtime.tv_sec);
691 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
692 inode->i_mtime.tv_nsec);
694 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
695 inode->i_ctime.tv_sec);
696 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
697 inode->i_ctime.tv_nsec);
699 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
700 btrfs_set_inode_generation(leaf, item, inode->i_generation);
701 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
702 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
703 btrfs_set_inode_block_group(leaf, item,
704 BTRFS_I(inode)->block_group->key.objectid);
707 int btrfs_update_inode(struct btrfs_trans_handle *trans,
708 struct btrfs_root *root,
711 struct btrfs_inode_item *inode_item;
712 struct btrfs_path *path;
713 struct extent_buffer *leaf;
716 path = btrfs_alloc_path();
718 ret = btrfs_lookup_inode(trans, root, path,
719 &BTRFS_I(inode)->location, 1);
726 leaf = path->nodes[0];
727 inode_item = btrfs_item_ptr(leaf, path->slots[0],
728 struct btrfs_inode_item);
730 fill_inode_item(leaf, inode_item, inode);
731 btrfs_mark_buffer_dirty(leaf);
732 btrfs_set_inode_last_trans(trans, inode);
735 btrfs_release_path(root, path);
736 btrfs_free_path(path);
741 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
742 struct btrfs_root *root,
744 struct dentry *dentry)
746 struct btrfs_path *path;
747 const char *name = dentry->d_name.name;
748 int name_len = dentry->d_name.len;
750 struct extent_buffer *leaf;
751 struct btrfs_dir_item *di;
752 struct btrfs_key key;
754 path = btrfs_alloc_path();
760 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
770 leaf = path->nodes[0];
771 btrfs_dir_item_key_to_cpu(leaf, di, &key);
772 ret = btrfs_delete_one_dir_name(trans, root, path, di);
775 btrfs_release_path(root, path);
777 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
778 key.objectid, name, name_len, -1);
787 ret = btrfs_delete_one_dir_name(trans, root, path, di);
789 dentry->d_inode->i_ctime = dir->i_ctime;
790 ret = btrfs_del_inode_ref(trans, root, name, name_len,
791 dentry->d_inode->i_ino,
792 dentry->d_parent->d_inode->i_ino);
794 printk("failed to delete reference to %.*s, "
795 "inode %lu parent %lu\n", name_len, name,
796 dentry->d_inode->i_ino,
797 dentry->d_parent->d_inode->i_ino);
800 btrfs_free_path(path);
802 dir->i_size -= name_len * 2;
803 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
804 btrfs_update_inode(trans, root, dir);
805 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
806 dentry->d_inode->i_nlink--;
808 drop_nlink(dentry->d_inode);
810 ret = btrfs_update_inode(trans, root, dentry->d_inode);
811 dir->i_sb->s_dirt = 1;
816 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
818 struct btrfs_root *root;
819 struct btrfs_trans_handle *trans;
820 struct inode *inode = dentry->d_inode;
822 unsigned long nr = 0;
824 root = BTRFS_I(dir)->root;
825 mutex_lock(&root->fs_info->fs_mutex);
827 ret = btrfs_check_free_space(root, 1, 1);
831 trans = btrfs_start_transaction(root, 1);
833 btrfs_set_trans_block_group(trans, dir);
834 ret = btrfs_unlink_trans(trans, root, dir, dentry);
835 nr = trans->blocks_used;
837 if (inode->i_nlink == 0) {
839 /* if the inode isn't linked anywhere,
840 * we don't need to worry about
843 found = btrfs_del_ordered_inode(inode);
845 atomic_dec(&inode->i_count);
849 btrfs_end_transaction(trans, root);
851 mutex_unlock(&root->fs_info->fs_mutex);
852 btrfs_btree_balance_dirty(root, nr);
853 btrfs_throttle(root);
857 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
859 struct inode *inode = dentry->d_inode;
862 struct btrfs_root *root = BTRFS_I(dir)->root;
863 struct btrfs_trans_handle *trans;
864 unsigned long nr = 0;
866 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
869 mutex_lock(&root->fs_info->fs_mutex);
870 ret = btrfs_check_free_space(root, 1, 1);
874 trans = btrfs_start_transaction(root, 1);
875 btrfs_set_trans_block_group(trans, dir);
877 /* now the directory is empty */
878 err = btrfs_unlink_trans(trans, root, dir, dentry);
883 nr = trans->blocks_used;
884 ret = btrfs_end_transaction(trans, root);
886 mutex_unlock(&root->fs_info->fs_mutex);
887 btrfs_btree_balance_dirty(root, nr);
888 btrfs_throttle(root);
896 * this can truncate away extent items, csum items and directory items.
897 * It starts at a high offset and removes keys until it can't find
898 * any higher than i_size.
900 * csum items that cross the new i_size are truncated to the new size
903 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
904 struct btrfs_root *root,
909 struct btrfs_path *path;
910 struct btrfs_key key;
911 struct btrfs_key found_key;
913 struct extent_buffer *leaf;
914 struct btrfs_file_extent_item *fi;
915 u64 extent_start = 0;
916 u64 extent_num_bytes = 0;
922 int pending_del_nr = 0;
923 int pending_del_slot = 0;
924 int extent_type = -1;
925 u64 mask = root->sectorsize - 1;
927 btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1);
928 path = btrfs_alloc_path();
932 /* FIXME, add redo link to tree so we don't leak on crash */
933 key.objectid = inode->i_ino;
934 key.offset = (u64)-1;
937 btrfs_init_path(path);
939 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
944 BUG_ON(path->slots[0] == 0);
950 leaf = path->nodes[0];
951 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
952 found_type = btrfs_key_type(&found_key);
954 if (found_key.objectid != inode->i_ino)
957 if (found_type < min_type)
960 item_end = found_key.offset;
961 if (found_type == BTRFS_EXTENT_DATA_KEY) {
962 fi = btrfs_item_ptr(leaf, path->slots[0],
963 struct btrfs_file_extent_item);
964 extent_type = btrfs_file_extent_type(leaf, fi);
965 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
967 btrfs_file_extent_num_bytes(leaf, fi);
968 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
969 struct btrfs_item *item = btrfs_item_nr(leaf,
971 item_end += btrfs_file_extent_inline_len(leaf,
976 if (found_type == BTRFS_CSUM_ITEM_KEY) {
977 ret = btrfs_csum_truncate(trans, root, path,
981 if (item_end < inode->i_size) {
982 if (found_type == BTRFS_DIR_ITEM_KEY) {
983 found_type = BTRFS_INODE_ITEM_KEY;
984 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
985 found_type = BTRFS_CSUM_ITEM_KEY;
986 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
987 found_type = BTRFS_XATTR_ITEM_KEY;
988 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
989 found_type = BTRFS_INODE_REF_KEY;
990 } else if (found_type) {
995 btrfs_set_key_type(&key, found_type);
998 if (found_key.offset >= inode->i_size)
1004 /* FIXME, shrink the extent if the ref count is only 1 */
1005 if (found_type != BTRFS_EXTENT_DATA_KEY)
1008 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
1010 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
1012 u64 orig_num_bytes =
1013 btrfs_file_extent_num_bytes(leaf, fi);
1014 extent_num_bytes = inode->i_size -
1015 found_key.offset + root->sectorsize - 1;
1016 extent_num_bytes = extent_num_bytes &
1017 ~((u64)root->sectorsize - 1);
1018 btrfs_set_file_extent_num_bytes(leaf, fi,
1020 num_dec = (orig_num_bytes -
1022 if (extent_start != 0)
1023 dec_i_blocks(inode, num_dec);
1024 btrfs_mark_buffer_dirty(leaf);
1027 btrfs_file_extent_disk_num_bytes(leaf,
1029 /* FIXME blocksize != 4096 */
1030 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
1031 if (extent_start != 0) {
1033 dec_i_blocks(inode, num_dec);
1035 root_gen = btrfs_header_generation(leaf);
1036 root_owner = btrfs_header_owner(leaf);
1038 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1040 u32 newsize = inode->i_size - found_key.offset;
1041 dec_i_blocks(inode, item_end + 1 -
1042 found_key.offset - newsize);
1044 btrfs_file_extent_calc_inline_size(newsize);
1045 ret = btrfs_truncate_item(trans, root, path,
1049 dec_i_blocks(inode, item_end + 1 -
1055 if (!pending_del_nr) {
1056 /* no pending yet, add ourselves */
1057 pending_del_slot = path->slots[0];
1059 } else if (pending_del_nr &&
1060 path->slots[0] + 1 == pending_del_slot) {
1061 /* hop on the pending chunk */
1063 pending_del_slot = path->slots[0];
1065 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
1071 ret = btrfs_free_extent(trans, root, extent_start,
1074 root_gen, inode->i_ino,
1075 found_key.offset, 0);
1079 if (path->slots[0] == 0) {
1082 btrfs_release_path(root, path);
1087 if (pending_del_nr &&
1088 path->slots[0] + 1 != pending_del_slot) {
1089 struct btrfs_key debug;
1091 btrfs_item_key_to_cpu(path->nodes[0], &debug,
1093 ret = btrfs_del_items(trans, root, path,
1098 btrfs_release_path(root, path);
1104 if (pending_del_nr) {
1105 ret = btrfs_del_items(trans, root, path, pending_del_slot,
1108 btrfs_release_path(root, path);
1109 btrfs_free_path(path);
1110 inode->i_sb->s_dirt = 1;
1114 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
1118 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1119 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1120 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1123 WARN_ON(!PageLocked(page));
1124 set_page_extent_mapped(page);
1126 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
1127 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
1128 page_end, GFP_NOFS);
1130 if (zero_start != PAGE_CACHE_SIZE) {
1132 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
1133 flush_dcache_page(page);
1136 set_page_dirty(page);
1137 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
1143 * taken from block_truncate_page, but does cow as it zeros out
1144 * any bytes left in the last page in the file.
1146 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
1148 struct inode *inode = mapping->host;
1149 struct btrfs_root *root = BTRFS_I(inode)->root;
1150 u32 blocksize = root->sectorsize;
1151 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1152 unsigned offset = from & (PAGE_CACHE_SIZE-1);
1157 if ((offset & (blocksize - 1)) == 0)
1161 page = grab_cache_page(mapping, index);
1164 if (!PageUptodate(page)) {
1165 ret = btrfs_readpage(NULL, page);
1167 if (!PageUptodate(page)) {
1172 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1174 ret = btrfs_cow_one_page(inode, page, offset);
1177 page_cache_release(page);
1182 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
1184 struct inode *inode = dentry->d_inode;
1187 err = inode_change_ok(inode, attr);
1191 if (S_ISREG(inode->i_mode) &&
1192 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
1193 struct btrfs_trans_handle *trans;
1194 struct btrfs_root *root = BTRFS_I(inode)->root;
1195 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1197 u64 mask = root->sectorsize - 1;
1198 u64 hole_start = (inode->i_size + mask) & ~mask;
1199 u64 block_end = (attr->ia_size + mask) & ~mask;
1203 if (attr->ia_size <= hole_start)
1206 mutex_lock(&root->fs_info->fs_mutex);
1207 err = btrfs_check_free_space(root, 1, 0);
1208 mutex_unlock(&root->fs_info->fs_mutex);
1212 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1214 lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
1215 hole_size = block_end - hole_start;
1217 mutex_lock(&root->fs_info->fs_mutex);
1218 trans = btrfs_start_transaction(root, 1);
1219 btrfs_set_trans_block_group(trans, inode);
1220 err = btrfs_drop_extents(trans, root, inode,
1221 hole_start, block_end, hole_start,
1224 if (alloc_hint != EXTENT_MAP_INLINE) {
1225 err = btrfs_insert_file_extent(trans, root,
1229 btrfs_drop_extent_cache(inode, hole_start,
1231 btrfs_check_file(root, inode);
1233 btrfs_end_transaction(trans, root);
1234 mutex_unlock(&root->fs_info->fs_mutex);
1235 unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
1240 err = inode_setattr(inode, attr);
1245 void btrfs_put_inode(struct inode *inode)
1249 if (!BTRFS_I(inode)->ordered_trans) {
1253 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1254 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1257 ret = btrfs_del_ordered_inode(inode);
1259 atomic_dec(&inode->i_count);
1263 void btrfs_delete_inode(struct inode *inode)
1265 struct btrfs_trans_handle *trans;
1266 struct btrfs_root *root = BTRFS_I(inode)->root;
1270 truncate_inode_pages(&inode->i_data, 0);
1271 if (is_bad_inode(inode)) {
1276 mutex_lock(&root->fs_info->fs_mutex);
1277 trans = btrfs_start_transaction(root, 1);
1279 btrfs_set_trans_block_group(trans, inode);
1280 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
1282 goto no_delete_lock;
1284 nr = trans->blocks_used;
1287 btrfs_end_transaction(trans, root);
1288 mutex_unlock(&root->fs_info->fs_mutex);
1289 btrfs_btree_balance_dirty(root, nr);
1290 btrfs_throttle(root);
1294 nr = trans->blocks_used;
1295 btrfs_end_transaction(trans, root);
1296 mutex_unlock(&root->fs_info->fs_mutex);
1297 btrfs_btree_balance_dirty(root, nr);
1298 btrfs_throttle(root);
1304 * this returns the key found in the dir entry in the location pointer.
1305 * If no dir entries were found, location->objectid is 0.
1307 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1308 struct btrfs_key *location)
1310 const char *name = dentry->d_name.name;
1311 int namelen = dentry->d_name.len;
1312 struct btrfs_dir_item *di;
1313 struct btrfs_path *path;
1314 struct btrfs_root *root = BTRFS_I(dir)->root;
1317 if (namelen == 1 && strcmp(name, ".") == 0) {
1318 location->objectid = dir->i_ino;
1319 location->type = BTRFS_INODE_ITEM_KEY;
1320 location->offset = 0;
1323 path = btrfs_alloc_path();
1326 if (namelen == 2 && strcmp(name, "..") == 0) {
1327 struct btrfs_key key;
1328 struct extent_buffer *leaf;
1332 key.objectid = dir->i_ino;
1333 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1335 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1339 leaf = path->nodes[0];
1340 slot = path->slots[0];
1341 nritems = btrfs_header_nritems(leaf);
1342 if (slot >= nritems)
1345 btrfs_item_key_to_cpu(leaf, &key, slot);
1346 if (key.objectid != dir->i_ino ||
1347 key.type != BTRFS_INODE_REF_KEY) {
1350 location->objectid = key.offset;
1351 location->type = BTRFS_INODE_ITEM_KEY;
1352 location->offset = 0;
1356 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1360 if (!di || IS_ERR(di)) {
1363 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
1365 btrfs_free_path(path);
1368 location->objectid = 0;
1373 * when we hit a tree root in a directory, the btrfs part of the inode
1374 * needs to be changed to reflect the root directory of the tree root. This
1375 * is kind of like crossing a mount point.
1377 static int fixup_tree_root_location(struct btrfs_root *root,
1378 struct btrfs_key *location,
1379 struct btrfs_root **sub_root,
1380 struct dentry *dentry)
1382 struct btrfs_path *path;
1383 struct btrfs_root_item *ri;
1385 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1387 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1390 path = btrfs_alloc_path();
1392 mutex_lock(&root->fs_info->fs_mutex);
1394 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1395 dentry->d_name.name,
1396 dentry->d_name.len);
1397 if (IS_ERR(*sub_root))
1398 return PTR_ERR(*sub_root);
1400 ri = &(*sub_root)->root_item;
1401 location->objectid = btrfs_root_dirid(ri);
1402 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1403 location->offset = 0;
1405 btrfs_free_path(path);
1406 mutex_unlock(&root->fs_info->fs_mutex);
1410 static int btrfs_init_locked_inode(struct inode *inode, void *p)
1412 struct btrfs_iget_args *args = p;
1413 inode->i_ino = args->ino;
1414 BTRFS_I(inode)->root = args->root;
1415 BTRFS_I(inode)->delalloc_bytes = 0;
1416 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1417 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1418 inode->i_mapping, GFP_NOFS);
1419 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1420 inode->i_mapping, GFP_NOFS);
1424 static int btrfs_find_actor(struct inode *inode, void *opaque)
1426 struct btrfs_iget_args *args = opaque;
1427 return (args->ino == inode->i_ino &&
1428 args->root == BTRFS_I(inode)->root);
1431 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1434 struct btrfs_iget_args args;
1435 args.ino = objectid;
1436 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1441 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1444 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1445 struct btrfs_root *root)
1447 struct inode *inode;
1448 struct btrfs_iget_args args;
1449 args.ino = objectid;
1452 inode = iget5_locked(s, objectid, btrfs_find_actor,
1453 btrfs_init_locked_inode,
1458 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1459 struct nameidata *nd)
1461 struct inode * inode;
1462 struct btrfs_inode *bi = BTRFS_I(dir);
1463 struct btrfs_root *root = bi->root;
1464 struct btrfs_root *sub_root = root;
1465 struct btrfs_key location;
1468 if (dentry->d_name.len > BTRFS_NAME_LEN)
1469 return ERR_PTR(-ENAMETOOLONG);
1471 mutex_lock(&root->fs_info->fs_mutex);
1472 ret = btrfs_inode_by_name(dir, dentry, &location);
1473 mutex_unlock(&root->fs_info->fs_mutex);
1476 return ERR_PTR(ret);
1479 if (location.objectid) {
1480 ret = fixup_tree_root_location(root, &location, &sub_root,
1483 return ERR_PTR(ret);
1485 return ERR_PTR(-ENOENT);
1486 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1489 return ERR_PTR(-EACCES);
1490 if (inode->i_state & I_NEW) {
1491 /* the inode and parent dir are two different roots */
1492 if (sub_root != root) {
1494 sub_root->inode = inode;
1496 BTRFS_I(inode)->root = sub_root;
1497 memcpy(&BTRFS_I(inode)->location, &location,
1499 btrfs_read_locked_inode(inode);
1500 unlock_new_inode(inode);
1503 return d_splice_alias(inode, dentry);
1506 static unsigned char btrfs_filetype_table[] = {
1507 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1510 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1512 struct inode *inode = filp->f_dentry->d_inode;
1513 struct btrfs_root *root = BTRFS_I(inode)->root;
1514 struct btrfs_item *item;
1515 struct btrfs_dir_item *di;
1516 struct btrfs_key key;
1517 struct btrfs_key found_key;
1518 struct btrfs_path *path;
1521 struct extent_buffer *leaf;
1524 unsigned char d_type;
1529 int key_type = BTRFS_DIR_INDEX_KEY;
1534 /* FIXME, use a real flag for deciding about the key type */
1535 if (root->fs_info->tree_root == root)
1536 key_type = BTRFS_DIR_ITEM_KEY;
1538 /* special case for "." */
1539 if (filp->f_pos == 0) {
1540 over = filldir(dirent, ".", 1,
1548 mutex_lock(&root->fs_info->fs_mutex);
1549 key.objectid = inode->i_ino;
1550 path = btrfs_alloc_path();
1553 /* special case for .., just use the back ref */
1554 if (filp->f_pos == 1) {
1555 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1557 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1559 leaf = path->nodes[0];
1560 slot = path->slots[0];
1561 nritems = btrfs_header_nritems(leaf);
1562 if (slot >= nritems) {
1563 btrfs_release_path(root, path);
1564 goto read_dir_items;
1566 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1567 btrfs_release_path(root, path);
1568 if (found_key.objectid != key.objectid ||
1569 found_key.type != BTRFS_INODE_REF_KEY)
1570 goto read_dir_items;
1571 over = filldir(dirent, "..", 2,
1572 2, found_key.offset, DT_DIR);
1579 btrfs_set_key_type(&key, key_type);
1580 key.offset = filp->f_pos;
1582 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1587 leaf = path->nodes[0];
1588 nritems = btrfs_header_nritems(leaf);
1589 slot = path->slots[0];
1590 if (advance || slot >= nritems) {
1591 if (slot >= nritems -1) {
1592 ret = btrfs_next_leaf(root, path);
1595 leaf = path->nodes[0];
1596 nritems = btrfs_header_nritems(leaf);
1597 slot = path->slots[0];
1604 item = btrfs_item_nr(leaf, slot);
1605 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1607 if (found_key.objectid != key.objectid)
1609 if (btrfs_key_type(&found_key) != key_type)
1611 if (found_key.offset < filp->f_pos)
1614 filp->f_pos = found_key.offset;
1616 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1618 di_total = btrfs_item_size(leaf, item);
1619 while(di_cur < di_total) {
1620 struct btrfs_key location;
1622 name_len = btrfs_dir_name_len(leaf, di);
1623 if (name_len < 32) {
1624 name_ptr = tmp_name;
1626 name_ptr = kmalloc(name_len, GFP_NOFS);
1629 read_extent_buffer(leaf, name_ptr,
1630 (unsigned long)(di + 1), name_len);
1632 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1633 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1634 over = filldir(dirent, name_ptr, name_len,
1639 if (name_ptr != tmp_name)
1644 di_len = btrfs_dir_name_len(leaf, di) +
1645 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1647 di = (struct btrfs_dir_item *)((char *)di + di_len);
1650 if (key_type == BTRFS_DIR_INDEX_KEY)
1651 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1657 btrfs_release_path(root, path);
1658 btrfs_free_path(path);
1659 mutex_unlock(&root->fs_info->fs_mutex);
1663 int btrfs_write_inode(struct inode *inode, int wait)
1665 struct btrfs_root *root = BTRFS_I(inode)->root;
1666 struct btrfs_trans_handle *trans;
1670 mutex_lock(&root->fs_info->fs_mutex);
1671 trans = btrfs_start_transaction(root, 1);
1672 btrfs_set_trans_block_group(trans, inode);
1673 ret = btrfs_commit_transaction(trans, root);
1674 mutex_unlock(&root->fs_info->fs_mutex);
1680 * This is somewhat expensive, updating the tree every time the
1681 * inode changes. But, it is most likely to find the inode in cache.
1682 * FIXME, needs more benchmarking...there are no reasons other than performance
1683 * to keep or drop this code.
1685 void btrfs_dirty_inode(struct inode *inode)
1687 struct btrfs_root *root = BTRFS_I(inode)->root;
1688 struct btrfs_trans_handle *trans;
1690 mutex_lock(&root->fs_info->fs_mutex);
1691 trans = btrfs_start_transaction(root, 1);
1692 btrfs_set_trans_block_group(trans, inode);
1693 btrfs_update_inode(trans, root, inode);
1694 btrfs_end_transaction(trans, root);
1695 mutex_unlock(&root->fs_info->fs_mutex);
1698 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1699 struct btrfs_root *root,
1700 const char *name, int name_len,
1703 struct btrfs_block_group_cache *group,
1706 struct inode *inode;
1707 struct btrfs_inode_item *inode_item;
1708 struct btrfs_block_group_cache *new_inode_group;
1709 struct btrfs_key *location;
1710 struct btrfs_path *path;
1711 struct btrfs_inode_ref *ref;
1712 struct btrfs_key key[2];
1718 path = btrfs_alloc_path();
1721 inode = new_inode(root->fs_info->sb);
1723 return ERR_PTR(-ENOMEM);
1725 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1726 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1727 inode->i_mapping, GFP_NOFS);
1728 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1729 inode->i_mapping, GFP_NOFS);
1730 BTRFS_I(inode)->delalloc_bytes = 0;
1731 BTRFS_I(inode)->root = root;
1737 new_inode_group = btrfs_find_block_group(root, group, 0,
1738 BTRFS_BLOCK_GROUP_METADATA, owner);
1739 if (!new_inode_group) {
1740 printk("find_block group failed\n");
1741 new_inode_group = group;
1743 BTRFS_I(inode)->block_group = new_inode_group;
1744 BTRFS_I(inode)->flags = 0;
1746 key[0].objectid = objectid;
1747 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1750 key[1].objectid = objectid;
1751 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1752 key[1].offset = ref_objectid;
1754 sizes[0] = sizeof(struct btrfs_inode_item);
1755 sizes[1] = name_len + sizeof(*ref);
1757 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1761 if (objectid > root->highest_inode)
1762 root->highest_inode = objectid;
1764 inode->i_uid = current->fsuid;
1765 inode->i_gid = current->fsgid;
1766 inode->i_mode = mode;
1767 inode->i_ino = objectid;
1768 inode->i_blocks = 0;
1769 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1770 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1771 struct btrfs_inode_item);
1772 fill_inode_item(path->nodes[0], inode_item, inode);
1774 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1775 struct btrfs_inode_ref);
1776 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1777 ptr = (unsigned long)(ref + 1);
1778 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1780 btrfs_mark_buffer_dirty(path->nodes[0]);
1781 btrfs_free_path(path);
1783 location = &BTRFS_I(inode)->location;
1784 location->objectid = objectid;
1785 location->offset = 0;
1786 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1788 insert_inode_hash(inode);
1791 btrfs_free_path(path);
1792 return ERR_PTR(ret);
1795 static inline u8 btrfs_inode_type(struct inode *inode)
1797 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1800 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1801 struct dentry *dentry, struct inode *inode,
1805 struct btrfs_key key;
1806 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1807 struct inode *parent_inode;
1809 key.objectid = inode->i_ino;
1810 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1813 ret = btrfs_insert_dir_item(trans, root,
1814 dentry->d_name.name, dentry->d_name.len,
1815 dentry->d_parent->d_inode->i_ino,
1816 &key, btrfs_inode_type(inode));
1819 ret = btrfs_insert_inode_ref(trans, root,
1820 dentry->d_name.name,
1823 dentry->d_parent->d_inode->i_ino);
1825 parent_inode = dentry->d_parent->d_inode;
1826 parent_inode->i_size += dentry->d_name.len * 2;
1827 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1828 ret = btrfs_update_inode(trans, root,
1829 dentry->d_parent->d_inode);
1834 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1835 struct dentry *dentry, struct inode *inode,
1838 int err = btrfs_add_link(trans, dentry, inode, backref);
1840 d_instantiate(dentry, inode);
1848 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1849 int mode, dev_t rdev)
1851 struct btrfs_trans_handle *trans;
1852 struct btrfs_root *root = BTRFS_I(dir)->root;
1853 struct inode *inode = NULL;
1857 unsigned long nr = 0;
1859 if (!new_valid_dev(rdev))
1862 mutex_lock(&root->fs_info->fs_mutex);
1863 err = btrfs_check_free_space(root, 1, 0);
1867 trans = btrfs_start_transaction(root, 1);
1868 btrfs_set_trans_block_group(trans, dir);
1870 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1876 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1878 dentry->d_parent->d_inode->i_ino, objectid,
1879 BTRFS_I(dir)->block_group, mode);
1880 err = PTR_ERR(inode);
1884 btrfs_set_trans_block_group(trans, inode);
1885 err = btrfs_add_nondir(trans, dentry, inode, 0);
1889 inode->i_op = &btrfs_special_inode_operations;
1890 init_special_inode(inode, inode->i_mode, rdev);
1891 btrfs_update_inode(trans, root, inode);
1893 dir->i_sb->s_dirt = 1;
1894 btrfs_update_inode_block_group(trans, inode);
1895 btrfs_update_inode_block_group(trans, dir);
1897 nr = trans->blocks_used;
1898 btrfs_end_transaction(trans, root);
1900 mutex_unlock(&root->fs_info->fs_mutex);
1903 inode_dec_link_count(inode);
1906 btrfs_btree_balance_dirty(root, nr);
1907 btrfs_throttle(root);
1911 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1912 int mode, struct nameidata *nd)
1914 struct btrfs_trans_handle *trans;
1915 struct btrfs_root *root = BTRFS_I(dir)->root;
1916 struct inode *inode = NULL;
1919 unsigned long nr = 0;
1922 mutex_lock(&root->fs_info->fs_mutex);
1923 err = btrfs_check_free_space(root, 1, 0);
1926 trans = btrfs_start_transaction(root, 1);
1927 btrfs_set_trans_block_group(trans, dir);
1929 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1935 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1937 dentry->d_parent->d_inode->i_ino,
1938 objectid, BTRFS_I(dir)->block_group, mode);
1939 err = PTR_ERR(inode);
1943 btrfs_set_trans_block_group(trans, inode);
1944 err = btrfs_add_nondir(trans, dentry, inode, 0);
1948 inode->i_mapping->a_ops = &btrfs_aops;
1949 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
1950 inode->i_fop = &btrfs_file_operations;
1951 inode->i_op = &btrfs_file_inode_operations;
1952 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1953 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1954 inode->i_mapping, GFP_NOFS);
1955 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1956 inode->i_mapping, GFP_NOFS);
1957 BTRFS_I(inode)->delalloc_bytes = 0;
1958 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
1960 dir->i_sb->s_dirt = 1;
1961 btrfs_update_inode_block_group(trans, inode);
1962 btrfs_update_inode_block_group(trans, dir);
1964 nr = trans->blocks_used;
1965 btrfs_end_transaction(trans, root);
1967 mutex_unlock(&root->fs_info->fs_mutex);
1970 inode_dec_link_count(inode);
1973 btrfs_btree_balance_dirty(root, nr);
1974 btrfs_throttle(root);
1978 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1979 struct dentry *dentry)
1981 struct btrfs_trans_handle *trans;
1982 struct btrfs_root *root = BTRFS_I(dir)->root;
1983 struct inode *inode = old_dentry->d_inode;
1984 unsigned long nr = 0;
1988 if (inode->i_nlink == 0)
1991 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1996 mutex_lock(&root->fs_info->fs_mutex);
1997 err = btrfs_check_free_space(root, 1, 0);
2000 trans = btrfs_start_transaction(root, 1);
2002 btrfs_set_trans_block_group(trans, dir);
2003 atomic_inc(&inode->i_count);
2004 err = btrfs_add_nondir(trans, dentry, inode, 1);
2009 dir->i_sb->s_dirt = 1;
2010 btrfs_update_inode_block_group(trans, dir);
2011 err = btrfs_update_inode(trans, root, inode);
2016 nr = trans->blocks_used;
2017 btrfs_end_transaction(trans, root);
2019 mutex_unlock(&root->fs_info->fs_mutex);
2022 inode_dec_link_count(inode);
2025 btrfs_btree_balance_dirty(root, nr);
2026 btrfs_throttle(root);
2030 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
2032 struct inode *inode;
2033 struct btrfs_trans_handle *trans;
2034 struct btrfs_root *root = BTRFS_I(dir)->root;
2036 int drop_on_err = 0;
2038 unsigned long nr = 1;
2040 mutex_lock(&root->fs_info->fs_mutex);
2041 err = btrfs_check_free_space(root, 1, 0);
2045 trans = btrfs_start_transaction(root, 1);
2046 btrfs_set_trans_block_group(trans, dir);
2048 if (IS_ERR(trans)) {
2049 err = PTR_ERR(trans);
2053 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2059 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2061 dentry->d_parent->d_inode->i_ino, objectid,
2062 BTRFS_I(dir)->block_group, S_IFDIR | mode);
2063 if (IS_ERR(inode)) {
2064 err = PTR_ERR(inode);
2069 inode->i_op = &btrfs_dir_inode_operations;
2070 inode->i_fop = &btrfs_dir_file_operations;
2071 btrfs_set_trans_block_group(trans, inode);
2074 err = btrfs_update_inode(trans, root, inode);
2078 err = btrfs_add_link(trans, dentry, inode, 0);
2082 d_instantiate(dentry, inode);
2084 dir->i_sb->s_dirt = 1;
2085 btrfs_update_inode_block_group(trans, inode);
2086 btrfs_update_inode_block_group(trans, dir);
2089 nr = trans->blocks_used;
2090 btrfs_end_transaction(trans, root);
2093 mutex_unlock(&root->fs_info->fs_mutex);
2096 btrfs_btree_balance_dirty(root, nr);
2097 btrfs_throttle(root);
2101 static int merge_extent_mapping(struct extent_map_tree *em_tree,
2102 struct extent_map *existing,
2103 struct extent_map *em)
2108 int real_blocks = existing->block_start < EXTENT_MAP_LAST_BYTE;
2110 if (real_blocks && em->block_start >= EXTENT_MAP_LAST_BYTE)
2113 if (!real_blocks && em->block_start != existing->block_start)
2116 new_end = max(existing->start + existing->len, em->start + em->len);
2118 if (existing->start >= em->start) {
2119 if (em->start + em->len < existing->start)
2122 start_diff = existing->start - em->start;
2123 if (real_blocks && em->block_start + start_diff !=
2124 existing->block_start)
2127 em->len = new_end - em->start;
2129 remove_extent_mapping(em_tree, existing);
2130 /* free for the tree */
2131 free_extent_map(existing);
2132 ret = add_extent_mapping(em_tree, em);
2134 } else if (em->start > existing->start) {
2136 if (existing->start + existing->len < em->start)
2139 start_diff = em->start - existing->start;
2140 if (real_blocks && existing->block_start + start_diff !=
2144 remove_extent_mapping(em_tree, existing);
2145 em->block_start = existing->block_start;
2146 em->start = existing->start;
2147 em->len = new_end - existing->start;
2148 free_extent_map(existing);
2150 ret = add_extent_mapping(em_tree, em);
2157 printk("invalid extent map merge [%Lu %Lu %Lu] [%Lu %Lu %Lu]\n",
2158 existing->start, existing->len, existing->block_start,
2159 em->start, em->len, em->block_start);
2163 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2164 size_t pg_offset, u64 start, u64 len,
2170 u64 extent_start = 0;
2172 u64 objectid = inode->i_ino;
2174 struct btrfs_path *path;
2175 struct btrfs_root *root = BTRFS_I(inode)->root;
2176 struct btrfs_file_extent_item *item;
2177 struct extent_buffer *leaf;
2178 struct btrfs_key found_key;
2179 struct extent_map *em = NULL;
2180 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2181 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2182 struct btrfs_trans_handle *trans = NULL;
2184 path = btrfs_alloc_path();
2186 mutex_lock(&root->fs_info->fs_mutex);
2189 spin_lock(&em_tree->lock);
2190 em = lookup_extent_mapping(em_tree, start, len);
2191 spin_unlock(&em_tree->lock);
2194 if (em->start > start) {
2195 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
2196 start, len, em->start, em->len);
2199 if (em->block_start == EXTENT_MAP_INLINE && page)
2200 free_extent_map(em);
2204 em = alloc_extent_map(GFP_NOFS);
2210 em->start = EXTENT_MAP_HOLE;
2212 em->bdev = inode->i_sb->s_bdev;
2213 ret = btrfs_lookup_file_extent(trans, root, path,
2214 objectid, start, trans != NULL);
2221 if (path->slots[0] == 0)
2226 leaf = path->nodes[0];
2227 item = btrfs_item_ptr(leaf, path->slots[0],
2228 struct btrfs_file_extent_item);
2229 /* are we inside the extent that was found? */
2230 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2231 found_type = btrfs_key_type(&found_key);
2232 if (found_key.objectid != objectid ||
2233 found_type != BTRFS_EXTENT_DATA_KEY) {
2237 found_type = btrfs_file_extent_type(leaf, item);
2238 extent_start = found_key.offset;
2239 if (found_type == BTRFS_FILE_EXTENT_REG) {
2240 extent_end = extent_start +
2241 btrfs_file_extent_num_bytes(leaf, item);
2243 if (start < extent_start || start >= extent_end) {
2245 if (start < extent_start) {
2246 if (start + len <= extent_start)
2248 em->len = extent_end - extent_start;
2254 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
2256 em->start = extent_start;
2257 em->len = extent_end - extent_start;
2258 em->block_start = EXTENT_MAP_HOLE;
2261 bytenr += btrfs_file_extent_offset(leaf, item);
2262 em->block_start = bytenr;
2263 em->start = extent_start;
2264 em->len = extent_end - extent_start;
2266 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
2271 size_t extent_offset;
2274 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2276 extent_end = (extent_start + size + root->sectorsize - 1) &
2277 ~((u64)root->sectorsize - 1);
2278 if (start < extent_start || start >= extent_end) {
2280 if (start < extent_start) {
2281 if (start + len <= extent_start)
2283 em->len = extent_end - extent_start;
2289 em->block_start = EXTENT_MAP_INLINE;
2292 em->start = extent_start;
2297 page_start = page_offset(page) + pg_offset;
2298 extent_offset = page_start - extent_start;
2299 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
2300 size - extent_offset);
2301 em->start = extent_start + extent_offset;
2302 em->len = (copy_size + root->sectorsize - 1) &
2303 ~((u64)root->sectorsize - 1);
2305 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
2306 if (create == 0 && !PageUptodate(page)) {
2307 read_extent_buffer(leaf, map + pg_offset, ptr,
2309 flush_dcache_page(page);
2310 } else if (create && PageUptodate(page)) {
2313 free_extent_map(em);
2315 btrfs_release_path(root, path);
2316 trans = btrfs_start_transaction(root, 1);
2319 write_extent_buffer(leaf, map + pg_offset, ptr,
2321 btrfs_mark_buffer_dirty(leaf);
2324 set_extent_uptodate(io_tree, em->start,
2325 extent_map_end(em) - 1, GFP_NOFS);
2328 printk("unkknown found_type %d\n", found_type);
2335 em->block_start = EXTENT_MAP_HOLE;
2337 btrfs_release_path(root, path);
2338 if (em->start > start || extent_map_end(em) <= start) {
2339 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
2345 spin_lock(&em_tree->lock);
2346 ret = add_extent_mapping(em_tree, em);
2348 /* it is possible that someone inserted the extent into the tree
2349 * while we had the lock dropped. It is also possible that
2350 * an overlapping map exists in the tree
2352 if (ret == -EEXIST) {
2353 struct extent_map *existing;
2354 existing = lookup_extent_mapping(em_tree, start, len);
2356 existing = lookup_extent_mapping(em_tree, em->start,
2359 err = merge_extent_mapping(em_tree, existing,
2361 free_extent_map(existing);
2363 free_extent_map(em);
2368 printk("failing to insert %Lu %Lu\n",
2370 free_extent_map(em);
2374 free_extent_map(em);
2378 spin_unlock(&em_tree->lock);
2380 btrfs_free_path(path);
2382 ret = btrfs_end_transaction(trans, root);
2386 mutex_unlock(&root->fs_info->fs_mutex);
2388 free_extent_map(em);
2390 return ERR_PTR(err);
2395 static int btrfs_get_block(struct inode *inode, sector_t iblock,
2396 struct buffer_head *bh_result, int create)
2398 struct extent_map *em;
2399 u64 start = (u64)iblock << inode->i_blkbits;
2400 struct btrfs_multi_bio *multi = NULL;
2401 struct btrfs_root *root = BTRFS_I(inode)->root;
2407 em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0);
2409 if (!em || IS_ERR(em))
2412 if (em->start > start || em->start + em->len <= start)
2415 if (em->block_start == EXTENT_MAP_INLINE) {
2420 if (em->block_start == EXTENT_MAP_HOLE ||
2421 em->block_start == EXTENT_MAP_DELALLOC) {
2425 len = em->start + em->len - start;
2426 len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size)));
2428 logical = start - em->start;
2429 logical = em->block_start + logical;
2432 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
2433 logical, &map_length, &multi, 0);
2435 bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits;
2436 bh_result->b_size = min(map_length, len);
2437 bh_result->b_bdev = multi->stripes[0].dev->bdev;
2438 set_buffer_mapped(bh_result);
2441 free_extent_map(em);
2445 static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
2446 const struct iovec *iov, loff_t offset,
2447 unsigned long nr_segs)
2449 struct file *file = iocb->ki_filp;
2450 struct inode *inode = file->f_mapping->host;
2455 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2456 offset, nr_segs, btrfs_get_block, NULL);
2459 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
2461 return extent_bmap(mapping, iblock, btrfs_get_extent);
2464 int btrfs_readpage(struct file *file, struct page *page)
2466 struct extent_io_tree *tree;
2467 tree = &BTRFS_I(page->mapping->host)->io_tree;
2468 return extent_read_full_page(tree, page, btrfs_get_extent);
2471 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
2473 struct extent_io_tree *tree;
2476 if (current->flags & PF_MEMALLOC) {
2477 redirty_page_for_writepage(wbc, page);
2481 tree = &BTRFS_I(page->mapping->host)->io_tree;
2482 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
2485 static int btrfs_writepages(struct address_space *mapping,
2486 struct writeback_control *wbc)
2488 struct extent_io_tree *tree;
2489 tree = &BTRFS_I(mapping->host)->io_tree;
2490 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2494 btrfs_readpages(struct file *file, struct address_space *mapping,
2495 struct list_head *pages, unsigned nr_pages)
2497 struct extent_io_tree *tree;
2498 tree = &BTRFS_I(mapping->host)->io_tree;
2499 return extent_readpages(tree, mapping, pages, nr_pages,
2503 static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
2505 struct extent_io_tree *tree;
2506 struct extent_map_tree *map;
2509 tree = &BTRFS_I(page->mapping->host)->io_tree;
2510 map = &BTRFS_I(page->mapping->host)->extent_tree;
2511 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
2513 ClearPagePrivate(page);
2514 set_page_private(page, 0);
2515 page_cache_release(page);
2520 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
2522 struct extent_io_tree *tree;
2524 tree = &BTRFS_I(page->mapping->host)->io_tree;
2525 extent_invalidatepage(tree, page, offset);
2526 btrfs_releasepage(page, GFP_NOFS);
2530 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2531 * called from a page fault handler when a page is first dirtied. Hence we must
2532 * be careful to check for EOF conditions here. We set the page up correctly
2533 * for a written page which means we get ENOSPC checking when writing into
2534 * holes and correct delalloc and unwritten extent mapping on filesystems that
2535 * support these features.
2537 * We are not allowed to take the i_mutex here so we have to play games to
2538 * protect against truncate races as the page could now be beyond EOF. Because
2539 * vmtruncate() writes the inode size before removing pages, once we have the
2540 * page lock we can determine safely if the page is beyond EOF. If it is not
2541 * beyond EOF, then the page is guaranteed safe against truncation until we
2544 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2546 struct inode *inode = fdentry(vma->vm_file)->d_inode;
2547 struct btrfs_root *root = BTRFS_I(inode)->root;
2553 mutex_lock(&root->fs_info->fs_mutex);
2554 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
2555 mutex_unlock(&root->fs_info->fs_mutex);
2562 wait_on_page_writeback(page);
2563 size = i_size_read(inode);
2564 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2566 if ((page->mapping != inode->i_mapping) ||
2567 (page_start > size)) {
2568 /* page got truncated out from underneath us */
2572 /* page is wholly or partially inside EOF */
2573 if (page_start + PAGE_CACHE_SIZE > size)
2574 end = size & ~PAGE_CACHE_MASK;
2576 end = PAGE_CACHE_SIZE;
2578 ret = btrfs_cow_one_page(inode, page, end);
2586 static void btrfs_truncate(struct inode *inode)
2588 struct btrfs_root *root = BTRFS_I(inode)->root;
2590 struct btrfs_trans_handle *trans;
2593 if (!S_ISREG(inode->i_mode))
2595 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2598 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2600 mutex_lock(&root->fs_info->fs_mutex);
2601 trans = btrfs_start_transaction(root, 1);
2602 btrfs_set_trans_block_group(trans, inode);
2604 /* FIXME, add redo link to tree so we don't leak on crash */
2605 ret = btrfs_truncate_in_trans(trans, root, inode,
2606 BTRFS_EXTENT_DATA_KEY);
2607 btrfs_update_inode(trans, root, inode);
2608 nr = trans->blocks_used;
2610 ret = btrfs_end_transaction(trans, root);
2612 mutex_unlock(&root->fs_info->fs_mutex);
2613 btrfs_btree_balance_dirty(root, nr);
2614 btrfs_throttle(root);
2617 static int noinline create_subvol(struct btrfs_root *root, char *name,
2620 struct btrfs_trans_handle *trans;
2621 struct btrfs_key key;
2622 struct btrfs_root_item root_item;
2623 struct btrfs_inode_item *inode_item;
2624 struct extent_buffer *leaf;
2625 struct btrfs_root *new_root = root;
2626 struct inode *inode;
2631 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2632 unsigned long nr = 1;
2634 mutex_lock(&root->fs_info->fs_mutex);
2635 ret = btrfs_check_free_space(root, 1, 0);
2639 trans = btrfs_start_transaction(root, 1);
2642 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2647 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2648 objectid, trans->transid, 0, 0,
2651 return PTR_ERR(leaf);
2653 btrfs_set_header_nritems(leaf, 0);
2654 btrfs_set_header_level(leaf, 0);
2655 btrfs_set_header_bytenr(leaf, leaf->start);
2656 btrfs_set_header_generation(leaf, trans->transid);
2657 btrfs_set_header_owner(leaf, objectid);
2659 write_extent_buffer(leaf, root->fs_info->fsid,
2660 (unsigned long)btrfs_header_fsid(leaf),
2662 btrfs_mark_buffer_dirty(leaf);
2664 inode_item = &root_item.inode;
2665 memset(inode_item, 0, sizeof(*inode_item));
2666 inode_item->generation = cpu_to_le64(1);
2667 inode_item->size = cpu_to_le64(3);
2668 inode_item->nlink = cpu_to_le32(1);
2669 inode_item->nblocks = cpu_to_le64(1);
2670 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
2672 btrfs_set_root_bytenr(&root_item, leaf->start);
2673 btrfs_set_root_level(&root_item, 0);
2674 btrfs_set_root_refs(&root_item, 1);
2675 btrfs_set_root_used(&root_item, 0);
2677 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2678 root_item.drop_level = 0;
2680 free_extent_buffer(leaf);
2683 btrfs_set_root_dirid(&root_item, new_dirid);
2685 key.objectid = objectid;
2687 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2688 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2694 * insert the directory item
2696 key.offset = (u64)-1;
2697 dir = root->fs_info->sb->s_root->d_inode;
2698 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2699 name, namelen, dir->i_ino, &key,
2704 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2705 name, namelen, objectid,
2706 root->fs_info->sb->s_root->d_inode->i_ino);
2710 ret = btrfs_commit_transaction(trans, root);
2714 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2717 trans = btrfs_start_transaction(new_root, 1);
2720 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2722 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2725 inode->i_op = &btrfs_dir_inode_operations;
2726 inode->i_fop = &btrfs_dir_file_operations;
2727 new_root->inode = inode;
2729 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2733 ret = btrfs_update_inode(trans, new_root, inode);
2737 nr = trans->blocks_used;
2738 err = btrfs_commit_transaction(trans, new_root);
2742 mutex_unlock(&root->fs_info->fs_mutex);
2743 btrfs_btree_balance_dirty(root, nr);
2744 btrfs_throttle(root);
2748 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2750 struct btrfs_pending_snapshot *pending_snapshot;
2751 struct btrfs_trans_handle *trans;
2754 unsigned long nr = 0;
2756 if (!root->ref_cows)
2759 mutex_lock(&root->fs_info->fs_mutex);
2760 ret = btrfs_check_free_space(root, 1, 0);
2764 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2765 if (!pending_snapshot) {
2769 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
2770 if (!pending_snapshot->name) {
2772 kfree(pending_snapshot);
2775 memcpy(pending_snapshot->name, name, namelen);
2776 pending_snapshot->name[namelen] = '\0';
2777 trans = btrfs_start_transaction(root, 1);
2779 pending_snapshot->root = root;
2780 list_add(&pending_snapshot->list,
2781 &trans->transaction->pending_snapshots);
2782 ret = btrfs_update_inode(trans, root, root->inode);
2783 err = btrfs_commit_transaction(trans, root);
2786 mutex_unlock(&root->fs_info->fs_mutex);
2787 btrfs_btree_balance_dirty(root, nr);
2788 btrfs_throttle(root);
2792 unsigned long btrfs_force_ra(struct address_space *mapping,
2793 struct file_ra_state *ra, struct file *file,
2794 pgoff_t offset, pgoff_t last_index)
2798 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2799 req_size = last_index - offset + 1;
2800 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2803 req_size = min(last_index - offset + 1, (pgoff_t)128);
2804 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2805 return offset + req_size;
2809 int btrfs_defrag_file(struct file *file) {
2810 struct inode *inode = fdentry(file)->d_inode;
2811 struct btrfs_root *root = BTRFS_I(inode)->root;
2812 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2814 unsigned long last_index;
2815 unsigned long ra_index = 0;
2821 mutex_lock(&root->fs_info->fs_mutex);
2822 ret = btrfs_check_free_space(root, inode->i_size, 0);
2823 mutex_unlock(&root->fs_info->fs_mutex);
2827 mutex_lock(&inode->i_mutex);
2828 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2829 for (i = 0; i <= last_index; i++) {
2830 if (i == ra_index) {
2831 ra_index = btrfs_force_ra(inode->i_mapping,
2833 file, ra_index, last_index);
2835 page = grab_cache_page(inode->i_mapping, i);
2838 if (!PageUptodate(page)) {
2839 btrfs_readpage(NULL, page);
2841 if (!PageUptodate(page)) {
2843 page_cache_release(page);
2847 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2848 page_end = page_start + PAGE_CACHE_SIZE - 1;
2850 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
2851 set_extent_delalloc(io_tree, page_start,
2852 page_end, GFP_NOFS);
2854 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
2855 set_page_dirty(page);
2857 page_cache_release(page);
2858 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2862 mutex_unlock(&inode->i_mutex);
2866 static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2870 struct btrfs_ioctl_vol_args *vol_args;
2871 struct btrfs_trans_handle *trans;
2877 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2882 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2886 namelen = strlen(vol_args->name);
2887 if (namelen > BTRFS_VOL_NAME_MAX) {
2892 sizestr = vol_args->name;
2893 if (!strcmp(sizestr, "max"))
2894 new_size = root->fs_info->sb->s_bdev->bd_inode->i_size;
2896 if (sizestr[0] == '-') {
2899 } else if (sizestr[0] == '+') {
2903 new_size = btrfs_parse_size(sizestr);
2904 if (new_size == 0) {
2910 mutex_lock(&root->fs_info->fs_mutex);
2911 old_size = btrfs_super_total_bytes(&root->fs_info->super_copy);
2914 if (new_size > old_size) {
2918 new_size = old_size - new_size;
2919 } else if (mod > 0) {
2920 new_size = old_size + new_size;
2923 if (new_size < 256 * 1024 * 1024) {
2927 if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) {
2932 do_div(new_size, root->sectorsize);
2933 new_size *= root->sectorsize;
2935 printk("new size is %Lu\n", new_size);
2936 if (new_size > old_size) {
2937 trans = btrfs_start_transaction(root, 1);
2938 ret = btrfs_grow_extent_tree(trans, root, new_size);
2939 btrfs_commit_transaction(trans, root);
2941 ret = btrfs_shrink_extent_tree(root, new_size);
2945 mutex_unlock(&root->fs_info->fs_mutex);
2951 static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
2954 struct btrfs_ioctl_vol_args *vol_args;
2955 struct btrfs_dir_item *di;
2956 struct btrfs_path *path;
2961 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2966 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2971 namelen = strlen(vol_args->name);
2972 if (namelen > BTRFS_VOL_NAME_MAX) {
2976 if (strchr(vol_args->name, '/')) {
2981 path = btrfs_alloc_path();
2987 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2988 mutex_lock(&root->fs_info->fs_mutex);
2989 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2991 vol_args->name, namelen, 0);
2992 mutex_unlock(&root->fs_info->fs_mutex);
2993 btrfs_free_path(path);
2995 if (di && !IS_ERR(di)) {
3005 if (root == root->fs_info->tree_root)
3006 ret = create_subvol(root, vol_args->name, namelen);
3008 ret = create_snapshot(root, vol_args->name, namelen);
3014 static int btrfs_ioctl_defrag(struct file *file)
3016 struct inode *inode = fdentry(file)->d_inode;
3017 struct btrfs_root *root = BTRFS_I(inode)->root;
3019 switch (inode->i_mode & S_IFMT) {
3021 mutex_lock(&root->fs_info->fs_mutex);
3022 btrfs_defrag_root(root, 0);
3023 btrfs_defrag_root(root->fs_info->extent_root, 0);
3024 mutex_unlock(&root->fs_info->fs_mutex);
3027 btrfs_defrag_file(file);
3034 long btrfs_ioctl(struct file *file, unsigned int
3035 cmd, unsigned long arg)
3037 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3040 case BTRFS_IOC_SNAP_CREATE:
3041 return btrfs_ioctl_snap_create(root, (void __user *)arg);
3042 case BTRFS_IOC_DEFRAG:
3043 return btrfs_ioctl_defrag(file);
3044 case BTRFS_IOC_RESIZE:
3045 return btrfs_ioctl_resize(root, (void __user *)arg);
3052 * Called inside transaction, so use GFP_NOFS
3054 struct inode *btrfs_alloc_inode(struct super_block *sb)
3056 struct btrfs_inode *ei;
3058 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
3062 ei->ordered_trans = 0;
3063 return &ei->vfs_inode;
3066 void btrfs_destroy_inode(struct inode *inode)
3068 WARN_ON(!list_empty(&inode->i_dentry));
3069 WARN_ON(inode->i_data.nrpages);
3071 btrfs_drop_extent_cache(inode, 0, (u64)-1);
3072 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
3075 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3076 static void init_once(struct kmem_cache * cachep, void *foo)
3078 static void init_once(void * foo, struct kmem_cache * cachep,
3079 unsigned long flags)
3082 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
3084 inode_init_once(&ei->vfs_inode);
3087 void btrfs_destroy_cachep(void)
3089 if (btrfs_inode_cachep)
3090 kmem_cache_destroy(btrfs_inode_cachep);
3091 if (btrfs_trans_handle_cachep)
3092 kmem_cache_destroy(btrfs_trans_handle_cachep);
3093 if (btrfs_transaction_cachep)
3094 kmem_cache_destroy(btrfs_transaction_cachep);
3095 if (btrfs_bit_radix_cachep)
3096 kmem_cache_destroy(btrfs_bit_radix_cachep);
3097 if (btrfs_path_cachep)
3098 kmem_cache_destroy(btrfs_path_cachep);
3101 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
3102 unsigned long extra_flags,
3103 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3104 void (*ctor)(struct kmem_cache *, void *)
3106 void (*ctor)(void *, struct kmem_cache *,
3111 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
3112 SLAB_MEM_SPREAD | extra_flags), ctor
3113 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
3119 int btrfs_init_cachep(void)
3121 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
3122 sizeof(struct btrfs_inode),
3124 if (!btrfs_inode_cachep)
3126 btrfs_trans_handle_cachep =
3127 btrfs_cache_create("btrfs_trans_handle_cache",
3128 sizeof(struct btrfs_trans_handle),
3130 if (!btrfs_trans_handle_cachep)
3132 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
3133 sizeof(struct btrfs_transaction),
3135 if (!btrfs_transaction_cachep)
3137 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
3138 sizeof(struct btrfs_path),
3140 if (!btrfs_path_cachep)
3142 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
3143 SLAB_DESTROY_BY_RCU, NULL);
3144 if (!btrfs_bit_radix_cachep)
3148 btrfs_destroy_cachep();
3152 static int btrfs_getattr(struct vfsmount *mnt,
3153 struct dentry *dentry, struct kstat *stat)
3155 struct inode *inode = dentry->d_inode;
3156 generic_fillattr(inode, stat);
3157 stat->blksize = PAGE_CACHE_SIZE;
3158 stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9);
3162 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
3163 struct inode * new_dir,struct dentry *new_dentry)
3165 struct btrfs_trans_handle *trans;
3166 struct btrfs_root *root = BTRFS_I(old_dir)->root;
3167 struct inode *new_inode = new_dentry->d_inode;
3168 struct inode *old_inode = old_dentry->d_inode;
3169 struct timespec ctime = CURRENT_TIME;
3170 struct btrfs_path *path;
3173 if (S_ISDIR(old_inode->i_mode) && new_inode &&
3174 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
3178 mutex_lock(&root->fs_info->fs_mutex);
3179 ret = btrfs_check_free_space(root, 1, 0);
3183 trans = btrfs_start_transaction(root, 1);
3185 btrfs_set_trans_block_group(trans, new_dir);
3186 path = btrfs_alloc_path();
3192 old_dentry->d_inode->i_nlink++;
3193 old_dir->i_ctime = old_dir->i_mtime = ctime;
3194 new_dir->i_ctime = new_dir->i_mtime = ctime;
3195 old_inode->i_ctime = ctime;
3197 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
3202 new_inode->i_ctime = CURRENT_TIME;
3203 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
3207 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
3212 btrfs_free_path(path);
3213 btrfs_end_transaction(trans, root);
3215 mutex_unlock(&root->fs_info->fs_mutex);
3219 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
3220 const char *symname)
3222 struct btrfs_trans_handle *trans;
3223 struct btrfs_root *root = BTRFS_I(dir)->root;
3224 struct btrfs_path *path;
3225 struct btrfs_key key;
3226 struct inode *inode = NULL;
3233 struct btrfs_file_extent_item *ei;
3234 struct extent_buffer *leaf;
3235 unsigned long nr = 0;
3237 name_len = strlen(symname) + 1;
3238 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
3239 return -ENAMETOOLONG;
3241 mutex_lock(&root->fs_info->fs_mutex);
3242 err = btrfs_check_free_space(root, 1, 0);
3246 trans = btrfs_start_transaction(root, 1);
3247 btrfs_set_trans_block_group(trans, dir);
3249 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
3255 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
3257 dentry->d_parent->d_inode->i_ino, objectid,
3258 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
3259 err = PTR_ERR(inode);
3263 btrfs_set_trans_block_group(trans, inode);
3264 err = btrfs_add_nondir(trans, dentry, inode, 0);
3268 inode->i_mapping->a_ops = &btrfs_aops;
3269 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
3270 inode->i_fop = &btrfs_file_operations;
3271 inode->i_op = &btrfs_file_inode_operations;
3272 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
3273 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
3274 inode->i_mapping, GFP_NOFS);
3275 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
3276 inode->i_mapping, GFP_NOFS);
3277 BTRFS_I(inode)->delalloc_bytes = 0;
3278 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
3280 dir->i_sb->s_dirt = 1;
3281 btrfs_update_inode_block_group(trans, inode);
3282 btrfs_update_inode_block_group(trans, dir);
3286 path = btrfs_alloc_path();
3288 key.objectid = inode->i_ino;
3290 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
3291 datasize = btrfs_file_extent_calc_inline_size(name_len);
3292 err = btrfs_insert_empty_item(trans, root, path, &key,
3298 leaf = path->nodes[0];
3299 ei = btrfs_item_ptr(leaf, path->slots[0],
3300 struct btrfs_file_extent_item);
3301 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
3302 btrfs_set_file_extent_type(leaf, ei,
3303 BTRFS_FILE_EXTENT_INLINE);
3304 ptr = btrfs_file_extent_inline_start(ei);
3305 write_extent_buffer(leaf, symname, ptr, name_len);
3306 btrfs_mark_buffer_dirty(leaf);
3307 btrfs_free_path(path);
3309 inode->i_op = &btrfs_symlink_inode_operations;
3310 inode->i_mapping->a_ops = &btrfs_symlink_aops;
3311 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
3312 inode->i_size = name_len - 1;
3313 err = btrfs_update_inode(trans, root, inode);
3318 nr = trans->blocks_used;
3319 btrfs_end_transaction(trans, root);
3321 mutex_unlock(&root->fs_info->fs_mutex);
3323 inode_dec_link_count(inode);
3326 btrfs_btree_balance_dirty(root, nr);
3327 btrfs_throttle(root);
3331 static int btrfs_permission(struct inode *inode, int mask,
3332 struct nameidata *nd)
3334 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
3336 return generic_permission(inode, mask, NULL);
3339 static struct inode_operations btrfs_dir_inode_operations = {
3340 .lookup = btrfs_lookup,
3341 .create = btrfs_create,
3342 .unlink = btrfs_unlink,
3344 .mkdir = btrfs_mkdir,
3345 .rmdir = btrfs_rmdir,
3346 .rename = btrfs_rename,
3347 .symlink = btrfs_symlink,
3348 .setattr = btrfs_setattr,
3349 .mknod = btrfs_mknod,
3350 .setxattr = generic_setxattr,
3351 .getxattr = generic_getxattr,
3352 .listxattr = btrfs_listxattr,
3353 .removexattr = generic_removexattr,
3354 .permission = btrfs_permission,
3356 static struct inode_operations btrfs_dir_ro_inode_operations = {
3357 .lookup = btrfs_lookup,
3358 .permission = btrfs_permission,
3360 static struct file_operations btrfs_dir_file_operations = {
3361 .llseek = generic_file_llseek,
3362 .read = generic_read_dir,
3363 .readdir = btrfs_readdir,
3364 .unlocked_ioctl = btrfs_ioctl,
3365 #ifdef CONFIG_COMPAT
3366 .compat_ioctl = btrfs_ioctl,
3370 static struct extent_io_ops btrfs_extent_io_ops = {
3371 .fill_delalloc = run_delalloc_range,
3372 .submit_bio_hook = btrfs_submit_bio_hook,
3373 .merge_bio_hook = btrfs_merge_bio_hook,
3374 .readpage_io_hook = btrfs_readpage_io_hook,
3375 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
3376 .readpage_io_failed_hook = btrfs_readpage_io_failed_hook,
3377 .set_bit_hook = btrfs_set_bit_hook,
3378 .clear_bit_hook = btrfs_clear_bit_hook,
3381 static struct address_space_operations btrfs_aops = {
3382 .readpage = btrfs_readpage,
3383 .writepage = btrfs_writepage,
3384 .writepages = btrfs_writepages,
3385 .readpages = btrfs_readpages,
3386 .sync_page = block_sync_page,
3388 .direct_IO = btrfs_direct_IO,
3389 .invalidatepage = btrfs_invalidatepage,
3390 .releasepage = btrfs_releasepage,
3391 .set_page_dirty = __set_page_dirty_nobuffers,
3394 static struct address_space_operations btrfs_symlink_aops = {
3395 .readpage = btrfs_readpage,
3396 .writepage = btrfs_writepage,
3397 .invalidatepage = btrfs_invalidatepage,
3398 .releasepage = btrfs_releasepage,
3401 static struct inode_operations btrfs_file_inode_operations = {
3402 .truncate = btrfs_truncate,
3403 .getattr = btrfs_getattr,
3404 .setattr = btrfs_setattr,
3405 .setxattr = generic_setxattr,
3406 .getxattr = generic_getxattr,
3407 .listxattr = btrfs_listxattr,
3408 .removexattr = generic_removexattr,
3409 .permission = btrfs_permission,
3411 static struct inode_operations btrfs_special_inode_operations = {
3412 .getattr = btrfs_getattr,
3413 .setattr = btrfs_setattr,
3414 .permission = btrfs_permission,
3416 static struct inode_operations btrfs_symlink_inode_operations = {
3417 .readlink = generic_readlink,
3418 .follow_link = page_follow_link_light,
3419 .put_link = page_put_link,
3420 .permission = btrfs_permission,