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/kernel.h>
20 #include <linux/bio.h>
21 #include <linux/buffer_head.h>
22 #include <linux/file.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>
41 #include "transaction.h"
42 #include "btrfs_inode.h"
44 #include "print-tree.h"
47 struct btrfs_iget_args {
49 struct btrfs_root *root;
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;
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;
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,
79 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
82 u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy);
83 u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy);
95 spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
96 if (used + root->fs_info->delalloc_bytes + num_required > thresh)
98 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
102 static int cow_file_range(struct inode *inode, u64 start, u64 end)
104 struct btrfs_root *root = BTRFS_I(inode)->root;
105 struct btrfs_trans_handle *trans;
109 u64 blocksize = root->sectorsize;
110 u64 orig_start = start;
112 struct btrfs_key ins;
115 trans = btrfs_start_transaction(root, 1);
117 btrfs_set_trans_block_group(trans, inode);
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;
125 if (alloc_hint == EXTENT_MAP_INLINE)
128 BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy));
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,
134 root->root_key.objectid,
136 inode->i_ino, start, 0,
137 alloc_hint, (u64)-1, &ins, 1);
142 cur_alloc_size = ins.offset;
143 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
144 start, ins.objectid, ins.offset,
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,
153 num_bytes -= cur_alloc_size;
154 alloc_hint = ins.objectid + ins.offset;
155 start += cur_alloc_size;
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);
162 btrfs_end_transaction(trans, root);
166 static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end)
174 struct btrfs_root *root = BTRFS_I(inode)->root;
175 struct btrfs_block_group_cache *block_group;
176 struct extent_buffer *leaf;
178 struct btrfs_path *path;
179 struct btrfs_file_extent_item *item;
182 struct btrfs_key found_key;
184 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
185 path = btrfs_alloc_path();
188 ret = btrfs_lookup_file_extent(NULL, root, path,
189 inode->i_ino, start, 0);
191 btrfs_free_path(path);
197 if (path->slots[0] == 0)
202 leaf = path->nodes[0];
203 item = btrfs_item_ptr(leaf, path->slots[0],
204 struct btrfs_file_extent_item);
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)
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;
218 extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item);
219 extent_end = extent_start + extent_num_bytes;
222 if (loops && start != extent_start)
225 if (start < extent_start || start >= extent_end)
228 cow_end = min(end, extent_end - 1);
229 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
233 if (btrfs_count_snapshots_in_path(root, path, inode->i_ino,
239 * we may be called by the resizer, make sure we're inside
240 * the limits of the FS
242 block_group = btrfs_lookup_block_group(root->fs_info,
244 if (!block_group || block_group->ro)
253 btrfs_free_path(path);
256 btrfs_release_path(root, path);
261 cow_file_range(inode, start, end);
266 static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
268 struct btrfs_root *root = BTRFS_I(inode)->root;
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);
275 ret = cow_file_range(inode, start, end);
277 mutex_unlock(&root->fs_info->fs_mutex);
281 int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
282 unsigned long old, unsigned long bits)
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);
295 int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
296 unsigned long old, unsigned long bits)
298 if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
299 struct btrfs_root *root = BTRFS_I(inode)->root;
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;
309 root->fs_info->delalloc_bytes -= end - start + 1;
310 BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
312 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
317 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
318 size_t size, struct bio *bio)
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;
327 length = bio->bi_size;
328 map_tree = &root->fs_info->mapping_tree;
330 ret = btrfs_map_block(map_tree, READ, logical,
331 &map_length, NULL, 0);
333 if (map_length < length + size) {
339 int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
342 struct btrfs_root *root = BTRFS_I(inode)->root;
343 struct btrfs_trans_handle *trans;
347 ret = btrfs_csum_one_bio(root, bio, &sums);
350 mutex_lock(&root->fs_info->fs_mutex);
351 trans = btrfs_start_transaction(root, 1);
353 btrfs_set_trans_block_group(trans, inode);
354 btrfs_csum_file_blocks(trans, root, inode, bio, sums);
356 ret = btrfs_end_transaction(trans, root);
358 mutex_unlock(&root->fs_info->fs_mutex);
362 return btrfs_map_bio(root, rw, bio, mirror_num);
365 int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
368 struct btrfs_root *root = BTRFS_I(inode)->root;
371 if (!(rw & (1 << BIO_RW))) {
372 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
377 if (btrfs_test_opt(root, NODATASUM) ||
378 btrfs_test_flag(inode, NODATASUM)) {
382 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
383 inode, rw, bio, mirror_num,
384 __btrfs_submit_bio_hook);
386 return btrfs_map_bio(root, rw, bio, mirror_num);
389 int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
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;
399 if (btrfs_test_opt(root, NODATASUM) ||
400 btrfs_test_flag(inode, NODATASUM))
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);
408 /* a csum that isn't present is a preallocated region. */
409 if (ret == -ENOENT || ret == -EFBIG)
412 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
415 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
417 set_state_private(io_tree, start, csum);
420 btrfs_free_path(path);
421 mutex_unlock(&root->fs_info->fs_mutex);
425 struct io_failure_record {
433 int btrfs_io_failed_hook(struct bio *failed_bio,
434 struct page *page, u64 start, u64 end,
435 struct extent_state *state)
437 struct io_failure_record *failrec = NULL;
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;
449 ret = get_state_private(failure_tree, start, &private);
451 failrec = kmalloc(sizeof(*failrec), GFP_NOFS);
454 failrec->start = start;
455 failrec->len = end - start + 1;
456 failrec->last_mirror = 0;
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) {
464 spin_unlock(&em_tree->lock);
466 if (!em || IS_ERR(em)) {
470 logical = start - em->start;
471 logical = em->block_start + logical;
472 failrec->logical = logical;
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);
479 failrec = (struct io_failure_record *)(unsigned long)private;
481 num_copies = btrfs_num_copies(
482 &BTRFS_I(inode)->root->fs_info->mapping_tree,
483 failrec->logical, failrec->len);
484 failrec->last_mirror++;
486 spin_lock_irq(&BTRFS_I(inode)->io_tree.lock);
487 state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree,
490 if (state && state->start != failrec->start)
492 spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock);
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);
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;
508 bio_add_page(bio, page, failrec->len, start - page_offset(page));
509 if (failed_bio->bi_rw & (1 << BIO_RW))
514 BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio,
515 failrec->last_mirror);
519 int btrfs_clean_io_failures(struct inode *inode, u64 start)
523 struct io_failure_record *failure;
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);
532 failure = (struct io_failure_record *)(unsigned long)
534 set_state_private(&BTRFS_I(inode)->io_failure_tree,
536 clear_extent_bits(&BTRFS_I(inode)->io_failure_tree,
538 failure->start + failure->len - 1,
539 EXTENT_DIRTY | EXTENT_LOCKED,
547 int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
548 struct extent_state *state)
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;
554 u64 private = ~(u32)0;
556 struct btrfs_root *root = BTRFS_I(inode)->root;
560 if (btrfs_test_opt(root, NODATASUM) ||
561 btrfs_test_flag(inode, NODATASUM))
563 if (state && state->start == start) {
564 private = state->private;
567 ret = get_state_private(io_tree, start, &private);
569 local_irq_save(flags);
570 kaddr = kmap_atomic(page, KM_IRQ0);
574 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
575 btrfs_csum_final(csum, (char *)&csum);
576 if (csum != private) {
579 kunmap_atomic(kaddr, KM_IRQ0);
580 local_irq_restore(flags);
582 /* if the io failure tree for this inode is non-empty,
583 * check to see if we've recovered from a failed IO
585 btrfs_clean_io_failures(inode, start);
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,
592 memset(kaddr + offset, 1, end - start + 1);
593 flush_dcache_page(page);
594 kunmap_atomic(kaddr, KM_IRQ0);
595 local_irq_restore(flags);
601 void btrfs_read_locked_inode(struct inode *inode)
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;
613 path = btrfs_alloc_path();
615 mutex_lock(&root->fs_info->fs_mutex);
616 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
618 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
622 leaf = path->nodes[0];
623 inode_item = btrfs_item_ptr(leaf, path->slots[0],
624 struct btrfs_inode_item);
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);
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);
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);
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);
644 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
645 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
647 rdev = btrfs_inode_rdev(leaf, inode_item);
649 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
650 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
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,
656 BTRFS_BLOCK_GROUP_METADATA, 0);
658 btrfs_free_path(path);
661 mutex_unlock(&root->fs_info->fs_mutex);
663 switch (inode->i_mode & S_IFMT) {
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;
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;
676 inode->i_op = &btrfs_dir_inode_operations;
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;
684 init_special_inode(inode, inode->i_mode, rdev);
690 btrfs_release_path(root, path);
691 btrfs_free_path(path);
692 mutex_unlock(&root->fs_info->fs_mutex);
693 make_bad_inode(inode);
696 static void fill_inode_item(struct extent_buffer *leaf,
697 struct btrfs_inode_item *item,
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);
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);
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);
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);
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);
729 int btrfs_update_inode(struct btrfs_trans_handle *trans,
730 struct btrfs_root *root,
733 struct btrfs_inode_item *inode_item;
734 struct btrfs_path *path;
735 struct extent_buffer *leaf;
738 path = btrfs_alloc_path();
740 ret = btrfs_lookup_inode(trans, root, path,
741 &BTRFS_I(inode)->location, 1);
748 leaf = path->nodes[0];
749 inode_item = btrfs_item_ptr(leaf, path->slots[0],
750 struct btrfs_inode_item);
752 fill_inode_item(leaf, inode_item, inode);
753 btrfs_mark_buffer_dirty(leaf);
754 btrfs_set_inode_last_trans(trans, inode);
757 btrfs_release_path(root, path);
758 btrfs_free_path(path);
763 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
764 struct btrfs_root *root,
766 struct dentry *dentry)
768 struct btrfs_path *path;
769 const char *name = dentry->d_name.name;
770 int name_len = dentry->d_name.len;
772 struct extent_buffer *leaf;
773 struct btrfs_dir_item *di;
774 struct btrfs_key key;
776 path = btrfs_alloc_path();
782 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
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);
797 btrfs_release_path(root, path);
799 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
800 key.objectid, name, name_len, -1);
809 ret = btrfs_delete_one_dir_name(trans, root, path, di);
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);
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);
822 btrfs_free_path(path);
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--;
830 drop_nlink(dentry->d_inode);
832 ret = btrfs_update_inode(trans, root, dentry->d_inode);
833 dir->i_sb->s_dirt = 1;
838 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
840 struct btrfs_root *root;
841 struct btrfs_trans_handle *trans;
842 struct inode *inode = dentry->d_inode;
844 unsigned long nr = 0;
846 root = BTRFS_I(dir)->root;
847 mutex_lock(&root->fs_info->fs_mutex);
849 ret = btrfs_check_free_space(root, 1, 1);
853 trans = btrfs_start_transaction(root, 1);
855 btrfs_set_trans_block_group(trans, dir);
856 ret = btrfs_unlink_trans(trans, root, dir, dentry);
857 nr = trans->blocks_used;
859 if (inode->i_nlink == 0) {
861 /* if the inode isn't linked anywhere,
862 * we don't need to worry about
865 found = btrfs_del_ordered_inode(inode);
867 atomic_dec(&inode->i_count);
871 btrfs_end_transaction(trans, root);
873 mutex_unlock(&root->fs_info->fs_mutex);
874 btrfs_btree_balance_dirty(root, nr);
875 btrfs_throttle(root);
879 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
881 struct inode *inode = dentry->d_inode;
884 struct btrfs_root *root = BTRFS_I(dir)->root;
885 struct btrfs_trans_handle *trans;
886 unsigned long nr = 0;
888 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
891 mutex_lock(&root->fs_info->fs_mutex);
892 ret = btrfs_check_free_space(root, 1, 1);
896 trans = btrfs_start_transaction(root, 1);
897 btrfs_set_trans_block_group(trans, dir);
899 /* now the directory is empty */
900 err = btrfs_unlink_trans(trans, root, dir, dentry);
905 nr = trans->blocks_used;
906 ret = btrfs_end_transaction(trans, root);
908 mutex_unlock(&root->fs_info->fs_mutex);
909 btrfs_btree_balance_dirty(root, nr);
910 btrfs_throttle(root);
918 * this can truncate away extent items, csum items and directory items.
919 * It starts at a high offset and removes keys until it can't find
920 * any higher than i_size.
922 * csum items that cross the new i_size are truncated to the new size
925 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
926 struct btrfs_root *root,
931 struct btrfs_path *path;
932 struct btrfs_key key;
933 struct btrfs_key found_key;
935 struct extent_buffer *leaf;
936 struct btrfs_file_extent_item *fi;
937 u64 extent_start = 0;
938 u64 extent_num_bytes = 0;
944 int pending_del_nr = 0;
945 int pending_del_slot = 0;
946 int extent_type = -1;
947 u64 mask = root->sectorsize - 1;
949 btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1);
950 path = btrfs_alloc_path();
954 /* FIXME, add redo link to tree so we don't leak on crash */
955 key.objectid = inode->i_ino;
956 key.offset = (u64)-1;
959 btrfs_init_path(path);
961 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
966 BUG_ON(path->slots[0] == 0);
972 leaf = path->nodes[0];
973 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
974 found_type = btrfs_key_type(&found_key);
976 if (found_key.objectid != inode->i_ino)
979 if (found_type < min_type)
982 item_end = found_key.offset;
983 if (found_type == BTRFS_EXTENT_DATA_KEY) {
984 fi = btrfs_item_ptr(leaf, path->slots[0],
985 struct btrfs_file_extent_item);
986 extent_type = btrfs_file_extent_type(leaf, fi);
987 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
989 btrfs_file_extent_num_bytes(leaf, fi);
990 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
991 struct btrfs_item *item = btrfs_item_nr(leaf,
993 item_end += btrfs_file_extent_inline_len(leaf,
998 if (found_type == BTRFS_CSUM_ITEM_KEY) {
999 ret = btrfs_csum_truncate(trans, root, path,
1003 if (item_end < inode->i_size) {
1004 if (found_type == BTRFS_DIR_ITEM_KEY) {
1005 found_type = BTRFS_INODE_ITEM_KEY;
1006 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
1007 found_type = BTRFS_CSUM_ITEM_KEY;
1008 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
1009 found_type = BTRFS_XATTR_ITEM_KEY;
1010 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
1011 found_type = BTRFS_INODE_REF_KEY;
1012 } else if (found_type) {
1017 btrfs_set_key_type(&key, found_type);
1020 if (found_key.offset >= inode->i_size)
1026 /* FIXME, shrink the extent if the ref count is only 1 */
1027 if (found_type != BTRFS_EXTENT_DATA_KEY)
1030 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
1032 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
1034 u64 orig_num_bytes =
1035 btrfs_file_extent_num_bytes(leaf, fi);
1036 extent_num_bytes = inode->i_size -
1037 found_key.offset + root->sectorsize - 1;
1038 extent_num_bytes = extent_num_bytes &
1039 ~((u64)root->sectorsize - 1);
1040 btrfs_set_file_extent_num_bytes(leaf, fi,
1042 num_dec = (orig_num_bytes -
1044 if (extent_start != 0)
1045 dec_i_blocks(inode, num_dec);
1046 btrfs_mark_buffer_dirty(leaf);
1049 btrfs_file_extent_disk_num_bytes(leaf,
1051 /* FIXME blocksize != 4096 */
1052 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
1053 if (extent_start != 0) {
1055 dec_i_blocks(inode, num_dec);
1057 root_gen = btrfs_header_generation(leaf);
1058 root_owner = btrfs_header_owner(leaf);
1060 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1062 u32 newsize = inode->i_size - found_key.offset;
1063 dec_i_blocks(inode, item_end + 1 -
1064 found_key.offset - newsize);
1066 btrfs_file_extent_calc_inline_size(newsize);
1067 ret = btrfs_truncate_item(trans, root, path,
1071 dec_i_blocks(inode, item_end + 1 -
1077 if (!pending_del_nr) {
1078 /* no pending yet, add ourselves */
1079 pending_del_slot = path->slots[0];
1081 } else if (pending_del_nr &&
1082 path->slots[0] + 1 == pending_del_slot) {
1083 /* hop on the pending chunk */
1085 pending_del_slot = path->slots[0];
1087 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
1093 ret = btrfs_free_extent(trans, root, extent_start,
1096 root_gen, inode->i_ino,
1097 found_key.offset, 0);
1101 if (path->slots[0] == 0) {
1104 btrfs_release_path(root, path);
1109 if (pending_del_nr &&
1110 path->slots[0] + 1 != pending_del_slot) {
1111 struct btrfs_key debug;
1113 btrfs_item_key_to_cpu(path->nodes[0], &debug,
1115 ret = btrfs_del_items(trans, root, path,
1120 btrfs_release_path(root, path);
1126 if (pending_del_nr) {
1127 ret = btrfs_del_items(trans, root, path, pending_del_slot,
1130 btrfs_release_path(root, path);
1131 btrfs_free_path(path);
1132 inode->i_sb->s_dirt = 1;
1136 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
1140 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1141 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1142 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1145 WARN_ON(!PageLocked(page));
1146 set_page_extent_mapped(page);
1148 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
1149 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
1150 page_end, GFP_NOFS);
1152 if (zero_start != PAGE_CACHE_SIZE) {
1154 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
1155 flush_dcache_page(page);
1158 set_page_dirty(page);
1159 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
1165 * taken from block_truncate_page, but does cow as it zeros out
1166 * any bytes left in the last page in the file.
1168 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
1170 struct inode *inode = mapping->host;
1171 struct btrfs_root *root = BTRFS_I(inode)->root;
1172 u32 blocksize = root->sectorsize;
1173 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1174 unsigned offset = from & (PAGE_CACHE_SIZE-1);
1179 if ((offset & (blocksize - 1)) == 0)
1183 page = grab_cache_page(mapping, index);
1186 if (!PageUptodate(page)) {
1187 ret = btrfs_readpage(NULL, page);
1189 if (!PageUptodate(page)) {
1194 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1196 ret = btrfs_cow_one_page(inode, page, offset);
1199 page_cache_release(page);
1204 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
1206 struct inode *inode = dentry->d_inode;
1209 err = inode_change_ok(inode, attr);
1213 if (S_ISREG(inode->i_mode) &&
1214 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
1215 struct btrfs_trans_handle *trans;
1216 struct btrfs_root *root = BTRFS_I(inode)->root;
1217 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1219 u64 mask = root->sectorsize - 1;
1220 u64 hole_start = (inode->i_size + mask) & ~mask;
1221 u64 block_end = (attr->ia_size + mask) & ~mask;
1225 if (attr->ia_size <= hole_start)
1228 mutex_lock(&root->fs_info->fs_mutex);
1229 err = btrfs_check_free_space(root, 1, 0);
1230 mutex_unlock(&root->fs_info->fs_mutex);
1234 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1236 lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
1237 hole_size = block_end - hole_start;
1239 mutex_lock(&root->fs_info->fs_mutex);
1240 trans = btrfs_start_transaction(root, 1);
1241 btrfs_set_trans_block_group(trans, inode);
1242 err = btrfs_drop_extents(trans, root, inode,
1243 hole_start, block_end, hole_start,
1246 if (alloc_hint != EXTENT_MAP_INLINE) {
1247 err = btrfs_insert_file_extent(trans, root,
1251 btrfs_drop_extent_cache(inode, hole_start,
1253 btrfs_check_file(root, inode);
1255 btrfs_end_transaction(trans, root);
1256 mutex_unlock(&root->fs_info->fs_mutex);
1257 unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
1262 err = inode_setattr(inode, attr);
1267 void btrfs_put_inode(struct inode *inode)
1271 if (!BTRFS_I(inode)->ordered_trans) {
1275 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1276 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1279 ret = btrfs_del_ordered_inode(inode);
1281 atomic_dec(&inode->i_count);
1285 void btrfs_delete_inode(struct inode *inode)
1287 struct btrfs_trans_handle *trans;
1288 struct btrfs_root *root = BTRFS_I(inode)->root;
1292 truncate_inode_pages(&inode->i_data, 0);
1293 if (is_bad_inode(inode)) {
1298 mutex_lock(&root->fs_info->fs_mutex);
1299 trans = btrfs_start_transaction(root, 1);
1301 btrfs_set_trans_block_group(trans, inode);
1302 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
1304 goto no_delete_lock;
1306 nr = trans->blocks_used;
1309 btrfs_end_transaction(trans, root);
1310 mutex_unlock(&root->fs_info->fs_mutex);
1311 btrfs_btree_balance_dirty(root, nr);
1312 btrfs_throttle(root);
1316 nr = trans->blocks_used;
1317 btrfs_end_transaction(trans, root);
1318 mutex_unlock(&root->fs_info->fs_mutex);
1319 btrfs_btree_balance_dirty(root, nr);
1320 btrfs_throttle(root);
1326 * this returns the key found in the dir entry in the location pointer.
1327 * If no dir entries were found, location->objectid is 0.
1329 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1330 struct btrfs_key *location)
1332 const char *name = dentry->d_name.name;
1333 int namelen = dentry->d_name.len;
1334 struct btrfs_dir_item *di;
1335 struct btrfs_path *path;
1336 struct btrfs_root *root = BTRFS_I(dir)->root;
1339 if (namelen == 1 && strcmp(name, ".") == 0) {
1340 location->objectid = dir->i_ino;
1341 location->type = BTRFS_INODE_ITEM_KEY;
1342 location->offset = 0;
1345 path = btrfs_alloc_path();
1348 if (namelen == 2 && strcmp(name, "..") == 0) {
1349 struct btrfs_key key;
1350 struct extent_buffer *leaf;
1354 key.objectid = dir->i_ino;
1355 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1357 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1361 leaf = path->nodes[0];
1362 slot = path->slots[0];
1363 nritems = btrfs_header_nritems(leaf);
1364 if (slot >= nritems)
1367 btrfs_item_key_to_cpu(leaf, &key, slot);
1368 if (key.objectid != dir->i_ino ||
1369 key.type != BTRFS_INODE_REF_KEY) {
1372 location->objectid = key.offset;
1373 location->type = BTRFS_INODE_ITEM_KEY;
1374 location->offset = 0;
1378 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1382 if (!di || IS_ERR(di)) {
1385 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
1387 btrfs_free_path(path);
1390 location->objectid = 0;
1395 * when we hit a tree root in a directory, the btrfs part of the inode
1396 * needs to be changed to reflect the root directory of the tree root. This
1397 * is kind of like crossing a mount point.
1399 static int fixup_tree_root_location(struct btrfs_root *root,
1400 struct btrfs_key *location,
1401 struct btrfs_root **sub_root,
1402 struct dentry *dentry)
1404 struct btrfs_path *path;
1405 struct btrfs_root_item *ri;
1407 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1409 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1412 path = btrfs_alloc_path();
1414 mutex_lock(&root->fs_info->fs_mutex);
1416 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1417 dentry->d_name.name,
1418 dentry->d_name.len);
1419 if (IS_ERR(*sub_root))
1420 return PTR_ERR(*sub_root);
1422 ri = &(*sub_root)->root_item;
1423 location->objectid = btrfs_root_dirid(ri);
1424 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1425 location->offset = 0;
1427 btrfs_free_path(path);
1428 mutex_unlock(&root->fs_info->fs_mutex);
1432 static int btrfs_init_locked_inode(struct inode *inode, void *p)
1434 struct btrfs_iget_args *args = p;
1435 inode->i_ino = args->ino;
1436 BTRFS_I(inode)->root = args->root;
1437 BTRFS_I(inode)->delalloc_bytes = 0;
1438 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1439 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1440 inode->i_mapping, GFP_NOFS);
1441 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1442 inode->i_mapping, GFP_NOFS);
1443 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
1447 static int btrfs_find_actor(struct inode *inode, void *opaque)
1449 struct btrfs_iget_args *args = opaque;
1450 return (args->ino == inode->i_ino &&
1451 args->root == BTRFS_I(inode)->root);
1454 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1457 struct btrfs_iget_args args;
1458 args.ino = objectid;
1459 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1464 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1467 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1468 struct btrfs_root *root)
1470 struct inode *inode;
1471 struct btrfs_iget_args args;
1472 args.ino = objectid;
1475 inode = iget5_locked(s, objectid, btrfs_find_actor,
1476 btrfs_init_locked_inode,
1481 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1482 struct nameidata *nd)
1484 struct inode * inode;
1485 struct btrfs_inode *bi = BTRFS_I(dir);
1486 struct btrfs_root *root = bi->root;
1487 struct btrfs_root *sub_root = root;
1488 struct btrfs_key location;
1491 if (dentry->d_name.len > BTRFS_NAME_LEN)
1492 return ERR_PTR(-ENAMETOOLONG);
1494 mutex_lock(&root->fs_info->fs_mutex);
1495 ret = btrfs_inode_by_name(dir, dentry, &location);
1496 mutex_unlock(&root->fs_info->fs_mutex);
1499 return ERR_PTR(ret);
1502 if (location.objectid) {
1503 ret = fixup_tree_root_location(root, &location, &sub_root,
1506 return ERR_PTR(ret);
1508 return ERR_PTR(-ENOENT);
1509 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1512 return ERR_PTR(-EACCES);
1513 if (inode->i_state & I_NEW) {
1514 /* the inode and parent dir are two different roots */
1515 if (sub_root != root) {
1517 sub_root->inode = inode;
1519 BTRFS_I(inode)->root = sub_root;
1520 memcpy(&BTRFS_I(inode)->location, &location,
1522 btrfs_read_locked_inode(inode);
1523 unlock_new_inode(inode);
1526 return d_splice_alias(inode, dentry);
1529 static unsigned char btrfs_filetype_table[] = {
1530 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1533 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1535 struct inode *inode = filp->f_dentry->d_inode;
1536 struct btrfs_root *root = BTRFS_I(inode)->root;
1537 struct btrfs_item *item;
1538 struct btrfs_dir_item *di;
1539 struct btrfs_key key;
1540 struct btrfs_key found_key;
1541 struct btrfs_path *path;
1544 struct extent_buffer *leaf;
1547 unsigned char d_type;
1552 int key_type = BTRFS_DIR_INDEX_KEY;
1557 /* FIXME, use a real flag for deciding about the key type */
1558 if (root->fs_info->tree_root == root)
1559 key_type = BTRFS_DIR_ITEM_KEY;
1561 /* special case for "." */
1562 if (filp->f_pos == 0) {
1563 over = filldir(dirent, ".", 1,
1571 mutex_lock(&root->fs_info->fs_mutex);
1572 key.objectid = inode->i_ino;
1573 path = btrfs_alloc_path();
1576 /* special case for .., just use the back ref */
1577 if (filp->f_pos == 1) {
1578 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1580 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1582 leaf = path->nodes[0];
1583 slot = path->slots[0];
1584 nritems = btrfs_header_nritems(leaf);
1585 if (slot >= nritems) {
1586 btrfs_release_path(root, path);
1587 goto read_dir_items;
1589 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1590 btrfs_release_path(root, path);
1591 if (found_key.objectid != key.objectid ||
1592 found_key.type != BTRFS_INODE_REF_KEY)
1593 goto read_dir_items;
1594 over = filldir(dirent, "..", 2,
1595 2, found_key.offset, DT_DIR);
1602 btrfs_set_key_type(&key, key_type);
1603 key.offset = filp->f_pos;
1605 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1610 leaf = path->nodes[0];
1611 nritems = btrfs_header_nritems(leaf);
1612 slot = path->slots[0];
1613 if (advance || slot >= nritems) {
1614 if (slot >= nritems -1) {
1615 ret = btrfs_next_leaf(root, path);
1618 leaf = path->nodes[0];
1619 nritems = btrfs_header_nritems(leaf);
1620 slot = path->slots[0];
1627 item = btrfs_item_nr(leaf, slot);
1628 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1630 if (found_key.objectid != key.objectid)
1632 if (btrfs_key_type(&found_key) != key_type)
1634 if (found_key.offset < filp->f_pos)
1637 filp->f_pos = found_key.offset;
1639 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1641 di_total = btrfs_item_size(leaf, item);
1642 while(di_cur < di_total) {
1643 struct btrfs_key location;
1645 name_len = btrfs_dir_name_len(leaf, di);
1646 if (name_len < 32) {
1647 name_ptr = tmp_name;
1649 name_ptr = kmalloc(name_len, GFP_NOFS);
1652 read_extent_buffer(leaf, name_ptr,
1653 (unsigned long)(di + 1), name_len);
1655 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1656 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1657 over = filldir(dirent, name_ptr, name_len,
1662 if (name_ptr != tmp_name)
1667 di_len = btrfs_dir_name_len(leaf, di) +
1668 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1670 di = (struct btrfs_dir_item *)((char *)di + di_len);
1673 if (key_type == BTRFS_DIR_INDEX_KEY)
1674 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1680 btrfs_release_path(root, path);
1681 btrfs_free_path(path);
1682 mutex_unlock(&root->fs_info->fs_mutex);
1686 int btrfs_write_inode(struct inode *inode, int wait)
1688 struct btrfs_root *root = BTRFS_I(inode)->root;
1689 struct btrfs_trans_handle *trans;
1693 mutex_lock(&root->fs_info->fs_mutex);
1694 trans = btrfs_start_transaction(root, 1);
1695 btrfs_set_trans_block_group(trans, inode);
1696 ret = btrfs_commit_transaction(trans, root);
1697 mutex_unlock(&root->fs_info->fs_mutex);
1703 * This is somewhat expensive, updating the tree every time the
1704 * inode changes. But, it is most likely to find the inode in cache.
1705 * FIXME, needs more benchmarking...there are no reasons other than performance
1706 * to keep or drop this code.
1708 void btrfs_dirty_inode(struct inode *inode)
1710 struct btrfs_root *root = BTRFS_I(inode)->root;
1711 struct btrfs_trans_handle *trans;
1713 mutex_lock(&root->fs_info->fs_mutex);
1714 trans = btrfs_start_transaction(root, 1);
1715 btrfs_set_trans_block_group(trans, inode);
1716 btrfs_update_inode(trans, root, inode);
1717 btrfs_end_transaction(trans, root);
1718 mutex_unlock(&root->fs_info->fs_mutex);
1721 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1722 struct btrfs_root *root,
1723 const char *name, int name_len,
1726 struct btrfs_block_group_cache *group,
1729 struct inode *inode;
1730 struct btrfs_inode_item *inode_item;
1731 struct btrfs_block_group_cache *new_inode_group;
1732 struct btrfs_key *location;
1733 struct btrfs_path *path;
1734 struct btrfs_inode_ref *ref;
1735 struct btrfs_key key[2];
1741 path = btrfs_alloc_path();
1744 inode = new_inode(root->fs_info->sb);
1746 return ERR_PTR(-ENOMEM);
1748 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1749 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1750 inode->i_mapping, GFP_NOFS);
1751 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1752 inode->i_mapping, GFP_NOFS);
1753 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
1754 BTRFS_I(inode)->delalloc_bytes = 0;
1755 BTRFS_I(inode)->root = root;
1761 new_inode_group = btrfs_find_block_group(root, group, 0,
1762 BTRFS_BLOCK_GROUP_METADATA, owner);
1763 if (!new_inode_group) {
1764 printk("find_block group failed\n");
1765 new_inode_group = group;
1767 BTRFS_I(inode)->block_group = new_inode_group;
1768 BTRFS_I(inode)->flags = 0;
1770 key[0].objectid = objectid;
1771 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1774 key[1].objectid = objectid;
1775 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1776 key[1].offset = ref_objectid;
1778 sizes[0] = sizeof(struct btrfs_inode_item);
1779 sizes[1] = name_len + sizeof(*ref);
1781 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1785 if (objectid > root->highest_inode)
1786 root->highest_inode = objectid;
1788 inode->i_uid = current->fsuid;
1789 inode->i_gid = current->fsgid;
1790 inode->i_mode = mode;
1791 inode->i_ino = objectid;
1792 inode->i_blocks = 0;
1793 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1794 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1795 struct btrfs_inode_item);
1796 fill_inode_item(path->nodes[0], inode_item, inode);
1798 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1799 struct btrfs_inode_ref);
1800 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1801 ptr = (unsigned long)(ref + 1);
1802 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1804 btrfs_mark_buffer_dirty(path->nodes[0]);
1805 btrfs_free_path(path);
1807 location = &BTRFS_I(inode)->location;
1808 location->objectid = objectid;
1809 location->offset = 0;
1810 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1812 insert_inode_hash(inode);
1815 btrfs_free_path(path);
1816 return ERR_PTR(ret);
1819 static inline u8 btrfs_inode_type(struct inode *inode)
1821 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1824 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1825 struct dentry *dentry, struct inode *inode,
1829 struct btrfs_key key;
1830 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1831 struct inode *parent_inode;
1833 key.objectid = inode->i_ino;
1834 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1837 ret = btrfs_insert_dir_item(trans, root,
1838 dentry->d_name.name, dentry->d_name.len,
1839 dentry->d_parent->d_inode->i_ino,
1840 &key, btrfs_inode_type(inode));
1843 ret = btrfs_insert_inode_ref(trans, root,
1844 dentry->d_name.name,
1847 dentry->d_parent->d_inode->i_ino);
1849 parent_inode = dentry->d_parent->d_inode;
1850 parent_inode->i_size += dentry->d_name.len * 2;
1851 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1852 ret = btrfs_update_inode(trans, root,
1853 dentry->d_parent->d_inode);
1858 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1859 struct dentry *dentry, struct inode *inode,
1862 int err = btrfs_add_link(trans, dentry, inode, backref);
1864 d_instantiate(dentry, inode);
1872 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1873 int mode, dev_t rdev)
1875 struct btrfs_trans_handle *trans;
1876 struct btrfs_root *root = BTRFS_I(dir)->root;
1877 struct inode *inode = NULL;
1881 unsigned long nr = 0;
1883 if (!new_valid_dev(rdev))
1886 mutex_lock(&root->fs_info->fs_mutex);
1887 err = btrfs_check_free_space(root, 1, 0);
1891 trans = btrfs_start_transaction(root, 1);
1892 btrfs_set_trans_block_group(trans, dir);
1894 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1900 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1902 dentry->d_parent->d_inode->i_ino, objectid,
1903 BTRFS_I(dir)->block_group, mode);
1904 err = PTR_ERR(inode);
1908 btrfs_set_trans_block_group(trans, inode);
1909 err = btrfs_add_nondir(trans, dentry, inode, 0);
1913 inode->i_op = &btrfs_special_inode_operations;
1914 init_special_inode(inode, inode->i_mode, rdev);
1915 btrfs_update_inode(trans, root, inode);
1917 dir->i_sb->s_dirt = 1;
1918 btrfs_update_inode_block_group(trans, inode);
1919 btrfs_update_inode_block_group(trans, dir);
1921 nr = trans->blocks_used;
1922 btrfs_end_transaction(trans, root);
1924 mutex_unlock(&root->fs_info->fs_mutex);
1927 inode_dec_link_count(inode);
1930 btrfs_btree_balance_dirty(root, nr);
1931 btrfs_throttle(root);
1935 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1936 int mode, struct nameidata *nd)
1938 struct btrfs_trans_handle *trans;
1939 struct btrfs_root *root = BTRFS_I(dir)->root;
1940 struct inode *inode = NULL;
1943 unsigned long nr = 0;
1946 mutex_lock(&root->fs_info->fs_mutex);
1947 err = btrfs_check_free_space(root, 1, 0);
1950 trans = btrfs_start_transaction(root, 1);
1951 btrfs_set_trans_block_group(trans, dir);
1953 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1959 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1961 dentry->d_parent->d_inode->i_ino,
1962 objectid, BTRFS_I(dir)->block_group, mode);
1963 err = PTR_ERR(inode);
1967 btrfs_set_trans_block_group(trans, inode);
1968 err = btrfs_add_nondir(trans, dentry, inode, 0);
1972 inode->i_mapping->a_ops = &btrfs_aops;
1973 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
1974 inode->i_fop = &btrfs_file_operations;
1975 inode->i_op = &btrfs_file_inode_operations;
1976 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1977 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1978 inode->i_mapping, GFP_NOFS);
1979 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1980 inode->i_mapping, GFP_NOFS);
1981 BTRFS_I(inode)->delalloc_bytes = 0;
1982 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
1983 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
1985 dir->i_sb->s_dirt = 1;
1986 btrfs_update_inode_block_group(trans, inode);
1987 btrfs_update_inode_block_group(trans, dir);
1989 nr = trans->blocks_used;
1990 btrfs_end_transaction(trans, root);
1992 mutex_unlock(&root->fs_info->fs_mutex);
1995 inode_dec_link_count(inode);
1998 btrfs_btree_balance_dirty(root, nr);
1999 btrfs_throttle(root);
2003 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
2004 struct dentry *dentry)
2006 struct btrfs_trans_handle *trans;
2007 struct btrfs_root *root = BTRFS_I(dir)->root;
2008 struct inode *inode = old_dentry->d_inode;
2009 unsigned long nr = 0;
2013 if (inode->i_nlink == 0)
2016 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
2021 mutex_lock(&root->fs_info->fs_mutex);
2022 err = btrfs_check_free_space(root, 1, 0);
2025 trans = btrfs_start_transaction(root, 1);
2027 btrfs_set_trans_block_group(trans, dir);
2028 atomic_inc(&inode->i_count);
2029 err = btrfs_add_nondir(trans, dentry, inode, 1);
2034 dir->i_sb->s_dirt = 1;
2035 btrfs_update_inode_block_group(trans, dir);
2036 err = btrfs_update_inode(trans, root, inode);
2041 nr = trans->blocks_used;
2042 btrfs_end_transaction(trans, root);
2044 mutex_unlock(&root->fs_info->fs_mutex);
2047 inode_dec_link_count(inode);
2050 btrfs_btree_balance_dirty(root, nr);
2051 btrfs_throttle(root);
2055 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
2057 struct inode *inode = NULL;
2058 struct btrfs_trans_handle *trans;
2059 struct btrfs_root *root = BTRFS_I(dir)->root;
2061 int drop_on_err = 0;
2063 unsigned long nr = 1;
2065 mutex_lock(&root->fs_info->fs_mutex);
2066 err = btrfs_check_free_space(root, 1, 0);
2070 trans = btrfs_start_transaction(root, 1);
2071 btrfs_set_trans_block_group(trans, dir);
2073 if (IS_ERR(trans)) {
2074 err = PTR_ERR(trans);
2078 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2084 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2086 dentry->d_parent->d_inode->i_ino, objectid,
2087 BTRFS_I(dir)->block_group, S_IFDIR | mode);
2088 if (IS_ERR(inode)) {
2089 err = PTR_ERR(inode);
2094 inode->i_op = &btrfs_dir_inode_operations;
2095 inode->i_fop = &btrfs_dir_file_operations;
2096 btrfs_set_trans_block_group(trans, inode);
2099 err = btrfs_update_inode(trans, root, inode);
2103 err = btrfs_add_link(trans, dentry, inode, 0);
2107 d_instantiate(dentry, inode);
2109 dir->i_sb->s_dirt = 1;
2110 btrfs_update_inode_block_group(trans, inode);
2111 btrfs_update_inode_block_group(trans, dir);
2114 nr = trans->blocks_used;
2115 btrfs_end_transaction(trans, root);
2118 mutex_unlock(&root->fs_info->fs_mutex);
2121 btrfs_btree_balance_dirty(root, nr);
2122 btrfs_throttle(root);
2126 static int merge_extent_mapping(struct extent_map_tree *em_tree,
2127 struct extent_map *existing,
2128 struct extent_map *em)
2133 int real_blocks = existing->block_start < EXTENT_MAP_LAST_BYTE;
2135 if (real_blocks && em->block_start >= EXTENT_MAP_LAST_BYTE)
2138 if (!real_blocks && em->block_start != existing->block_start)
2141 new_end = max(existing->start + existing->len, em->start + em->len);
2143 if (existing->start >= em->start) {
2144 if (em->start + em->len < existing->start)
2147 start_diff = existing->start - em->start;
2148 if (real_blocks && em->block_start + start_diff !=
2149 existing->block_start)
2152 em->len = new_end - em->start;
2154 remove_extent_mapping(em_tree, existing);
2155 /* free for the tree */
2156 free_extent_map(existing);
2157 ret = add_extent_mapping(em_tree, em);
2159 } else if (em->start > existing->start) {
2161 if (existing->start + existing->len < em->start)
2164 start_diff = em->start - existing->start;
2165 if (real_blocks && existing->block_start + start_diff !=
2169 remove_extent_mapping(em_tree, existing);
2170 em->block_start = existing->block_start;
2171 em->start = existing->start;
2172 em->len = new_end - existing->start;
2173 free_extent_map(existing);
2175 ret = add_extent_mapping(em_tree, em);
2182 printk("invalid extent map merge [%Lu %Lu %Lu] [%Lu %Lu %Lu]\n",
2183 existing->start, existing->len, existing->block_start,
2184 em->start, em->len, em->block_start);
2188 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2189 size_t pg_offset, u64 start, u64 len,
2195 u64 extent_start = 0;
2197 u64 objectid = inode->i_ino;
2199 struct btrfs_path *path;
2200 struct btrfs_root *root = BTRFS_I(inode)->root;
2201 struct btrfs_file_extent_item *item;
2202 struct extent_buffer *leaf;
2203 struct btrfs_key found_key;
2204 struct extent_map *em = NULL;
2205 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2206 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2207 struct btrfs_trans_handle *trans = NULL;
2209 path = btrfs_alloc_path();
2211 mutex_lock(&root->fs_info->fs_mutex);
2214 spin_lock(&em_tree->lock);
2215 em = lookup_extent_mapping(em_tree, start, len);
2217 em->bdev = root->fs_info->fs_devices->latest_bdev;
2218 spin_unlock(&em_tree->lock);
2221 if (em->start > start || em->start + em->len <= start)
2222 free_extent_map(em);
2223 else if (em->block_start == EXTENT_MAP_INLINE && page)
2224 free_extent_map(em);
2228 em = alloc_extent_map(GFP_NOFS);
2234 em->start = EXTENT_MAP_HOLE;
2236 em->bdev = root->fs_info->fs_devices->latest_bdev;
2237 ret = btrfs_lookup_file_extent(trans, root, path,
2238 objectid, start, trans != NULL);
2245 if (path->slots[0] == 0)
2250 leaf = path->nodes[0];
2251 item = btrfs_item_ptr(leaf, path->slots[0],
2252 struct btrfs_file_extent_item);
2253 /* are we inside the extent that was found? */
2254 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2255 found_type = btrfs_key_type(&found_key);
2256 if (found_key.objectid != objectid ||
2257 found_type != BTRFS_EXTENT_DATA_KEY) {
2261 found_type = btrfs_file_extent_type(leaf, item);
2262 extent_start = found_key.offset;
2263 if (found_type == BTRFS_FILE_EXTENT_REG) {
2264 extent_end = extent_start +
2265 btrfs_file_extent_num_bytes(leaf, item);
2267 if (start < extent_start || start >= extent_end) {
2269 if (start < extent_start) {
2270 if (start + len <= extent_start)
2272 em->len = extent_end - extent_start;
2278 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
2280 em->start = extent_start;
2281 em->len = extent_end - extent_start;
2282 em->block_start = EXTENT_MAP_HOLE;
2285 bytenr += btrfs_file_extent_offset(leaf, item);
2286 em->block_start = bytenr;
2287 em->start = extent_start;
2288 em->len = extent_end - extent_start;
2290 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
2295 size_t extent_offset;
2298 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2300 extent_end = (extent_start + size + root->sectorsize - 1) &
2301 ~((u64)root->sectorsize - 1);
2302 if (start < extent_start || start >= extent_end) {
2304 if (start < extent_start) {
2305 if (start + len <= extent_start)
2307 em->len = extent_end - extent_start;
2313 em->block_start = EXTENT_MAP_INLINE;
2316 em->start = extent_start;
2321 page_start = page_offset(page) + pg_offset;
2322 extent_offset = page_start - extent_start;
2323 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
2324 size - extent_offset);
2325 em->start = extent_start + extent_offset;
2326 em->len = (copy_size + root->sectorsize - 1) &
2327 ~((u64)root->sectorsize - 1);
2329 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
2330 if (create == 0 && !PageUptodate(page)) {
2331 read_extent_buffer(leaf, map + pg_offset, ptr,
2333 flush_dcache_page(page);
2334 } else if (create && PageUptodate(page)) {
2337 free_extent_map(em);
2339 btrfs_release_path(root, path);
2340 trans = btrfs_start_transaction(root, 1);
2343 write_extent_buffer(leaf, map + pg_offset, ptr,
2345 btrfs_mark_buffer_dirty(leaf);
2348 set_extent_uptodate(io_tree, em->start,
2349 extent_map_end(em) - 1, GFP_NOFS);
2352 printk("unkknown found_type %d\n", found_type);
2359 em->block_start = EXTENT_MAP_HOLE;
2361 btrfs_release_path(root, path);
2362 if (em->start > start || extent_map_end(em) <= start) {
2363 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
2369 spin_lock(&em_tree->lock);
2370 ret = add_extent_mapping(em_tree, em);
2371 /* it is possible that someone inserted the extent into the tree
2372 * while we had the lock dropped. It is also possible that
2373 * an overlapping map exists in the tree
2375 if (ret == -EEXIST) {
2376 struct extent_map *existing;
2377 existing = lookup_extent_mapping(em_tree, start, len);
2378 if (existing && (existing->start > start ||
2379 existing->start + existing->len <= start)) {
2380 free_extent_map(existing);
2384 existing = lookup_extent_mapping(em_tree, em->start,
2387 err = merge_extent_mapping(em_tree, existing,
2389 free_extent_map(existing);
2391 free_extent_map(em);
2396 printk("failing to insert %Lu %Lu\n",
2398 free_extent_map(em);
2402 free_extent_map(em);
2406 spin_unlock(&em_tree->lock);
2408 btrfs_free_path(path);
2410 ret = btrfs_end_transaction(trans, root);
2414 mutex_unlock(&root->fs_info->fs_mutex);
2416 free_extent_map(em);
2418 return ERR_PTR(err);
2423 #if 0 /* waiting for O_DIRECT reads */
2424 static int btrfs_get_block(struct inode *inode, sector_t iblock,
2425 struct buffer_head *bh_result, int create)
2427 struct extent_map *em;
2428 u64 start = (u64)iblock << inode->i_blkbits;
2429 struct btrfs_multi_bio *multi = NULL;
2430 struct btrfs_root *root = BTRFS_I(inode)->root;
2436 em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0);
2438 if (!em || IS_ERR(em))
2441 if (em->start > start || em->start + em->len <= start) {
2445 if (em->block_start == EXTENT_MAP_INLINE) {
2450 len = em->start + em->len - start;
2451 len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size)));
2453 if (em->block_start == EXTENT_MAP_HOLE ||
2454 em->block_start == EXTENT_MAP_DELALLOC) {
2455 bh_result->b_size = len;
2459 logical = start - em->start;
2460 logical = em->block_start + logical;
2463 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
2464 logical, &map_length, &multi, 0);
2466 bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits;
2467 bh_result->b_size = min(map_length, len);
2469 bh_result->b_bdev = multi->stripes[0].dev->bdev;
2470 set_buffer_mapped(bh_result);
2473 free_extent_map(em);
2478 static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
2479 const struct iovec *iov, loff_t offset,
2480 unsigned long nr_segs)
2484 struct file *file = iocb->ki_filp;
2485 struct inode *inode = file->f_mapping->host;
2490 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2491 offset, nr_segs, btrfs_get_block, NULL);
2495 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
2497 return extent_bmap(mapping, iblock, btrfs_get_extent);
2500 int btrfs_readpage(struct file *file, struct page *page)
2502 struct extent_io_tree *tree;
2503 tree = &BTRFS_I(page->mapping->host)->io_tree;
2504 return extent_read_full_page(tree, page, btrfs_get_extent);
2507 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
2509 struct extent_io_tree *tree;
2512 if (current->flags & PF_MEMALLOC) {
2513 redirty_page_for_writepage(wbc, page);
2517 tree = &BTRFS_I(page->mapping->host)->io_tree;
2518 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
2521 static int btrfs_writepages(struct address_space *mapping,
2522 struct writeback_control *wbc)
2524 struct extent_io_tree *tree;
2525 tree = &BTRFS_I(mapping->host)->io_tree;
2526 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2530 btrfs_readpages(struct file *file, struct address_space *mapping,
2531 struct list_head *pages, unsigned nr_pages)
2533 struct extent_io_tree *tree;
2534 tree = &BTRFS_I(mapping->host)->io_tree;
2535 return extent_readpages(tree, mapping, pages, nr_pages,
2539 static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
2541 struct extent_io_tree *tree;
2542 struct extent_map_tree *map;
2545 tree = &BTRFS_I(page->mapping->host)->io_tree;
2546 map = &BTRFS_I(page->mapping->host)->extent_tree;
2547 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
2549 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
2550 ClearPagePrivate(page);
2551 set_page_private(page, 0);
2552 page_cache_release(page);
2557 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
2559 struct extent_io_tree *tree;
2561 tree = &BTRFS_I(page->mapping->host)->io_tree;
2562 extent_invalidatepage(tree, page, offset);
2563 btrfs_releasepage(page, GFP_NOFS);
2564 if (PagePrivate(page)) {
2565 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
2566 ClearPagePrivate(page);
2567 set_page_private(page, 0);
2568 page_cache_release(page);
2573 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2574 * called from a page fault handler when a page is first dirtied. Hence we must
2575 * be careful to check for EOF conditions here. We set the page up correctly
2576 * for a written page which means we get ENOSPC checking when writing into
2577 * holes and correct delalloc and unwritten extent mapping on filesystems that
2578 * support these features.
2580 * We are not allowed to take the i_mutex here so we have to play games to
2581 * protect against truncate races as the page could now be beyond EOF. Because
2582 * vmtruncate() writes the inode size before removing pages, once we have the
2583 * page lock we can determine safely if the page is beyond EOF. If it is not
2584 * beyond EOF, then the page is guaranteed safe against truncation until we
2587 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2589 struct inode *inode = fdentry(vma->vm_file)->d_inode;
2590 struct btrfs_root *root = BTRFS_I(inode)->root;
2596 mutex_lock(&root->fs_info->fs_mutex);
2597 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
2598 mutex_unlock(&root->fs_info->fs_mutex);
2605 wait_on_page_writeback(page);
2606 size = i_size_read(inode);
2607 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2609 if ((page->mapping != inode->i_mapping) ||
2610 (page_start > size)) {
2611 /* page got truncated out from underneath us */
2615 /* page is wholly or partially inside EOF */
2616 if (page_start + PAGE_CACHE_SIZE > size)
2617 end = size & ~PAGE_CACHE_MASK;
2619 end = PAGE_CACHE_SIZE;
2621 ret = btrfs_cow_one_page(inode, page, end);
2629 static void btrfs_truncate(struct inode *inode)
2631 struct btrfs_root *root = BTRFS_I(inode)->root;
2633 struct btrfs_trans_handle *trans;
2636 if (!S_ISREG(inode->i_mode))
2638 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2641 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2643 mutex_lock(&root->fs_info->fs_mutex);
2644 trans = btrfs_start_transaction(root, 1);
2645 btrfs_set_trans_block_group(trans, inode);
2647 /* FIXME, add redo link to tree so we don't leak on crash */
2648 ret = btrfs_truncate_in_trans(trans, root, inode,
2649 BTRFS_EXTENT_DATA_KEY);
2650 btrfs_update_inode(trans, root, inode);
2651 nr = trans->blocks_used;
2653 ret = btrfs_end_transaction(trans, root);
2655 mutex_unlock(&root->fs_info->fs_mutex);
2656 btrfs_btree_balance_dirty(root, nr);
2657 btrfs_throttle(root);
2660 static int noinline create_subvol(struct btrfs_root *root, char *name,
2663 struct btrfs_trans_handle *trans;
2664 struct btrfs_key key;
2665 struct btrfs_root_item root_item;
2666 struct btrfs_inode_item *inode_item;
2667 struct extent_buffer *leaf;
2668 struct btrfs_root *new_root = root;
2669 struct inode *inode;
2674 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2675 unsigned long nr = 1;
2677 mutex_lock(&root->fs_info->fs_mutex);
2678 ret = btrfs_check_free_space(root, 1, 0);
2682 trans = btrfs_start_transaction(root, 1);
2685 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2690 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2691 objectid, trans->transid, 0, 0,
2694 return PTR_ERR(leaf);
2696 btrfs_set_header_nritems(leaf, 0);
2697 btrfs_set_header_level(leaf, 0);
2698 btrfs_set_header_bytenr(leaf, leaf->start);
2699 btrfs_set_header_generation(leaf, trans->transid);
2700 btrfs_set_header_owner(leaf, objectid);
2702 write_extent_buffer(leaf, root->fs_info->fsid,
2703 (unsigned long)btrfs_header_fsid(leaf),
2705 btrfs_mark_buffer_dirty(leaf);
2707 inode_item = &root_item.inode;
2708 memset(inode_item, 0, sizeof(*inode_item));
2709 inode_item->generation = cpu_to_le64(1);
2710 inode_item->size = cpu_to_le64(3);
2711 inode_item->nlink = cpu_to_le32(1);
2712 inode_item->nblocks = cpu_to_le64(1);
2713 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
2715 btrfs_set_root_bytenr(&root_item, leaf->start);
2716 btrfs_set_root_level(&root_item, 0);
2717 btrfs_set_root_refs(&root_item, 1);
2718 btrfs_set_root_used(&root_item, 0);
2720 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2721 root_item.drop_level = 0;
2723 free_extent_buffer(leaf);
2726 btrfs_set_root_dirid(&root_item, new_dirid);
2728 key.objectid = objectid;
2730 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2731 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2737 * insert the directory item
2739 key.offset = (u64)-1;
2740 dir = root->fs_info->sb->s_root->d_inode;
2741 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2742 name, namelen, dir->i_ino, &key,
2747 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2748 name, namelen, objectid,
2749 root->fs_info->sb->s_root->d_inode->i_ino);
2753 ret = btrfs_commit_transaction(trans, root);
2757 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2760 trans = btrfs_start_transaction(new_root, 1);
2763 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2765 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2768 inode->i_op = &btrfs_dir_inode_operations;
2769 inode->i_fop = &btrfs_dir_file_operations;
2770 new_root->inode = inode;
2772 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2776 ret = btrfs_update_inode(trans, new_root, inode);
2780 nr = trans->blocks_used;
2781 err = btrfs_commit_transaction(trans, new_root);
2785 mutex_unlock(&root->fs_info->fs_mutex);
2786 btrfs_btree_balance_dirty(root, nr);
2787 btrfs_throttle(root);
2791 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2793 struct btrfs_pending_snapshot *pending_snapshot;
2794 struct btrfs_trans_handle *trans;
2797 unsigned long nr = 0;
2799 if (!root->ref_cows)
2802 mutex_lock(&root->fs_info->fs_mutex);
2803 ret = btrfs_check_free_space(root, 1, 0);
2807 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2808 if (!pending_snapshot) {
2812 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
2813 if (!pending_snapshot->name) {
2815 kfree(pending_snapshot);
2818 memcpy(pending_snapshot->name, name, namelen);
2819 pending_snapshot->name[namelen] = '\0';
2820 trans = btrfs_start_transaction(root, 1);
2822 pending_snapshot->root = root;
2823 list_add(&pending_snapshot->list,
2824 &trans->transaction->pending_snapshots);
2825 ret = btrfs_update_inode(trans, root, root->inode);
2826 err = btrfs_commit_transaction(trans, root);
2829 mutex_unlock(&root->fs_info->fs_mutex);
2830 btrfs_btree_balance_dirty(root, nr);
2831 btrfs_throttle(root);
2835 unsigned long btrfs_force_ra(struct address_space *mapping,
2836 struct file_ra_state *ra, struct file *file,
2837 pgoff_t offset, pgoff_t last_index)
2839 pgoff_t req_size = last_index - offset + 1;
2841 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2842 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2845 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2846 return offset + req_size;
2850 int btrfs_defrag_file(struct file *file) {
2851 struct inode *inode = fdentry(file)->d_inode;
2852 struct btrfs_root *root = BTRFS_I(inode)->root;
2853 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2855 unsigned long last_index;
2856 unsigned long ra_pages = root->fs_info->bdi.ra_pages;
2857 unsigned long total_read = 0;
2863 mutex_lock(&root->fs_info->fs_mutex);
2864 ret = btrfs_check_free_space(root, inode->i_size, 0);
2865 mutex_unlock(&root->fs_info->fs_mutex);
2869 mutex_lock(&inode->i_mutex);
2870 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2871 for (i = 0; i <= last_index; i++) {
2872 if (total_read % ra_pages == 0) {
2873 btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
2874 min(last_index, i + ra_pages - 1));
2877 page = grab_cache_page(inode->i_mapping, i);
2880 if (!PageUptodate(page)) {
2881 btrfs_readpage(NULL, page);
2883 if (!PageUptodate(page)) {
2885 page_cache_release(page);
2890 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
2891 ClearPageDirty(page);
2893 cancel_dirty_page(page, PAGE_CACHE_SIZE);
2895 wait_on_page_writeback(page);
2896 set_page_extent_mapped(page);
2898 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2899 page_end = page_start + PAGE_CACHE_SIZE - 1;
2901 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
2902 set_extent_delalloc(io_tree, page_start,
2903 page_end, GFP_NOFS);
2905 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
2906 set_page_dirty(page);
2908 page_cache_release(page);
2909 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2913 mutex_unlock(&inode->i_mutex);
2917 static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2922 struct btrfs_ioctl_vol_args *vol_args;
2923 struct btrfs_trans_handle *trans;
2924 struct btrfs_device *device = NULL;
2926 char *devstr = NULL;
2931 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2936 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2940 namelen = strlen(vol_args->name);
2941 if (namelen > BTRFS_VOL_NAME_MAX) {
2946 mutex_lock(&root->fs_info->fs_mutex);
2947 sizestr = vol_args->name;
2948 devstr = strchr(sizestr, ':');
2951 sizestr = devstr + 1;
2953 devstr = vol_args->name;
2954 devid = simple_strtoull(devstr, &end, 10);
2955 printk("resizing devid %Lu\n", devid);
2957 device = btrfs_find_device(root, devid, NULL);
2959 printk("resizer unable to find device %Lu\n", devid);
2963 if (!strcmp(sizestr, "max"))
2964 new_size = device->bdev->bd_inode->i_size;
2966 if (sizestr[0] == '-') {
2969 } else if (sizestr[0] == '+') {
2973 new_size = btrfs_parse_size(sizestr);
2974 if (new_size == 0) {
2980 old_size = device->total_bytes;
2983 if (new_size > old_size) {
2987 new_size = old_size - new_size;
2988 } else if (mod > 0) {
2989 new_size = old_size + new_size;
2992 if (new_size < 256 * 1024 * 1024) {
2996 if (new_size > device->bdev->bd_inode->i_size) {
3001 do_div(new_size, root->sectorsize);
3002 new_size *= root->sectorsize;
3004 printk("new size for %s is %llu\n", device->name, (unsigned long long)new_size);
3006 if (new_size > old_size) {
3007 trans = btrfs_start_transaction(root, 1);
3008 ret = btrfs_grow_device(trans, device, new_size);
3009 btrfs_commit_transaction(trans, root);
3011 ret = btrfs_shrink_device(device, new_size);
3015 mutex_unlock(&root->fs_info->fs_mutex);
3021 static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
3024 struct btrfs_ioctl_vol_args *vol_args;
3025 struct btrfs_dir_item *di;
3026 struct btrfs_path *path;
3031 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
3036 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3041 namelen = strlen(vol_args->name);
3042 if (namelen > BTRFS_VOL_NAME_MAX) {
3046 if (strchr(vol_args->name, '/')) {
3051 path = btrfs_alloc_path();
3057 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
3058 mutex_lock(&root->fs_info->fs_mutex);
3059 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
3061 vol_args->name, namelen, 0);
3062 mutex_unlock(&root->fs_info->fs_mutex);
3063 btrfs_free_path(path);
3065 if (di && !IS_ERR(di)) {
3075 if (root == root->fs_info->tree_root)
3076 ret = create_subvol(root, vol_args->name, namelen);
3078 ret = create_snapshot(root, vol_args->name, namelen);
3084 static int btrfs_ioctl_defrag(struct file *file)
3086 struct inode *inode = fdentry(file)->d_inode;
3087 struct btrfs_root *root = BTRFS_I(inode)->root;
3089 switch (inode->i_mode & S_IFMT) {
3091 mutex_lock(&root->fs_info->fs_mutex);
3092 btrfs_defrag_root(root, 0);
3093 btrfs_defrag_root(root->fs_info->extent_root, 0);
3094 mutex_unlock(&root->fs_info->fs_mutex);
3097 btrfs_defrag_file(file);
3104 long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
3106 struct btrfs_ioctl_vol_args *vol_args;
3109 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
3114 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3118 ret = btrfs_init_new_device(root, vol_args->name);
3125 long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
3127 struct btrfs_ioctl_vol_args *vol_args;
3130 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
3135 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3139 ret = btrfs_rm_device(root, vol_args->name);
3146 int dup_item_to_inode(struct btrfs_trans_handle *trans,
3147 struct btrfs_root *root,
3148 struct btrfs_path *path,
3149 struct extent_buffer *leaf,
3151 struct btrfs_key *key,
3155 int len = btrfs_item_size_nr(leaf, slot);
3156 struct btrfs_key ckey = *key;
3159 dup = kmalloc(len, GFP_NOFS);
3163 read_extent_buffer(leaf, dup, btrfs_item_ptr_offset(leaf, slot), len);
3164 btrfs_release_path(root, path);
3166 ckey.objectid = destino;
3167 ret = btrfs_insert_item(trans, root, &ckey, dup, len);
3172 long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
3174 struct inode *inode = fdentry(file)->d_inode;
3175 struct btrfs_root *root = BTRFS_I(inode)->root;
3176 struct file *src_file;
3178 struct btrfs_trans_handle *trans;
3181 struct btrfs_path *path;
3182 struct btrfs_key key;
3183 struct extent_buffer *leaf;
3187 src_file = fget(src_fd);
3190 src = src_file->f_dentry->d_inode;
3193 if (src->i_sb != inode->i_sb)
3197 mutex_lock(&inode->i_mutex);
3198 mutex_lock(&src->i_mutex);
3200 mutex_lock(&src->i_mutex);
3201 mutex_lock(&inode->i_mutex);
3208 /* do any pending delalloc/csum calc on src, one way or
3209 another, and lock file content */
3211 filemap_write_and_wait(src->i_mapping);
3212 lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
3213 if (BTRFS_I(src)->delalloc_bytes == 0)
3215 unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
3218 mutex_lock(&root->fs_info->fs_mutex);
3219 trans = btrfs_start_transaction(root, 0);
3220 path = btrfs_alloc_path();
3226 key.type = BTRFS_EXTENT_DATA_KEY;
3227 key.objectid = src->i_ino;
3233 * note the key will change type as we walk through the
3236 ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
3240 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3241 ret = btrfs_next_leaf(root, path);
3247 leaf = path->nodes[0];
3248 slot = path->slots[0];
3249 btrfs_item_key_to_cpu(leaf, &key, slot);
3250 nritems = btrfs_header_nritems(leaf);
3252 if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY ||
3253 key.objectid != src->i_ino)
3256 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
3257 struct btrfs_file_extent_item *extent;
3260 extent = btrfs_item_ptr(leaf, slot,
3261 struct btrfs_file_extent_item);
3262 found_type = btrfs_file_extent_type(leaf, extent);
3263 if (found_type == BTRFS_FILE_EXTENT_REG) {
3264 u64 len = btrfs_file_extent_num_bytes(leaf,
3266 u64 ds = btrfs_file_extent_disk_bytenr(leaf,
3268 u64 dl = btrfs_file_extent_disk_num_bytes(leaf,
3270 u64 off = btrfs_file_extent_offset(leaf,
3272 btrfs_insert_file_extent(trans, root,
3275 /* ds == 0 means there's a hole */
3277 btrfs_inc_extent_ref(trans, root,
3279 root->root_key.objectid,
3283 pos = key.offset + len;
3284 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
3285 ret = dup_item_to_inode(trans, root, path,
3290 pos = key.offset + btrfs_item_size_nr(leaf,
3293 } else if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
3294 ret = dup_item_to_inode(trans, root, path, leaf,
3295 slot, &key, inode->i_ino);
3301 btrfs_release_path(root, path);
3306 btrfs_free_path(path);
3308 inode->i_blocks = src->i_blocks;
3309 i_size_write(inode, src->i_size);
3310 btrfs_update_inode(trans, root, inode);
3312 unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
3314 btrfs_end_transaction(trans, root);
3315 mutex_unlock(&root->fs_info->fs_mutex);
3318 mutex_unlock(&src->i_mutex);
3319 mutex_unlock(&inode->i_mutex);
3325 long btrfs_ioctl(struct file *file, unsigned int
3326 cmd, unsigned long arg)
3328 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3331 case BTRFS_IOC_SNAP_CREATE:
3332 return btrfs_ioctl_snap_create(root, (void __user *)arg);
3333 case BTRFS_IOC_DEFRAG:
3334 return btrfs_ioctl_defrag(file);
3335 case BTRFS_IOC_RESIZE:
3336 return btrfs_ioctl_resize(root, (void __user *)arg);
3337 case BTRFS_IOC_ADD_DEV:
3338 return btrfs_ioctl_add_dev(root, (void __user *)arg);
3339 case BTRFS_IOC_RM_DEV:
3340 return btrfs_ioctl_rm_dev(root, (void __user *)arg);
3341 case BTRFS_IOC_BALANCE:
3342 return btrfs_balance(root->fs_info->dev_root);
3343 case BTRFS_IOC_CLONE:
3344 return btrfs_ioctl_clone(file, arg);
3351 * Called inside transaction, so use GFP_NOFS
3353 struct inode *btrfs_alloc_inode(struct super_block *sb)
3355 struct btrfs_inode *ei;
3357 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
3361 ei->ordered_trans = 0;
3362 return &ei->vfs_inode;
3365 void btrfs_destroy_inode(struct inode *inode)
3367 WARN_ON(!list_empty(&inode->i_dentry));
3368 WARN_ON(inode->i_data.nrpages);
3370 btrfs_drop_extent_cache(inode, 0, (u64)-1);
3371 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
3374 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3375 static void init_once(struct kmem_cache * cachep, void *foo)
3377 static void init_once(void * foo, struct kmem_cache * cachep,
3378 unsigned long flags)
3381 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
3383 inode_init_once(&ei->vfs_inode);
3386 void btrfs_destroy_cachep(void)
3388 if (btrfs_inode_cachep)
3389 kmem_cache_destroy(btrfs_inode_cachep);
3390 if (btrfs_trans_handle_cachep)
3391 kmem_cache_destroy(btrfs_trans_handle_cachep);
3392 if (btrfs_transaction_cachep)
3393 kmem_cache_destroy(btrfs_transaction_cachep);
3394 if (btrfs_bit_radix_cachep)
3395 kmem_cache_destroy(btrfs_bit_radix_cachep);
3396 if (btrfs_path_cachep)
3397 kmem_cache_destroy(btrfs_path_cachep);
3400 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
3401 unsigned long extra_flags,
3402 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3403 void (*ctor)(struct kmem_cache *, void *)
3405 void (*ctor)(void *, struct kmem_cache *,
3410 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
3411 SLAB_MEM_SPREAD | extra_flags), ctor
3412 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
3418 int btrfs_init_cachep(void)
3420 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
3421 sizeof(struct btrfs_inode),
3423 if (!btrfs_inode_cachep)
3425 btrfs_trans_handle_cachep =
3426 btrfs_cache_create("btrfs_trans_handle_cache",
3427 sizeof(struct btrfs_trans_handle),
3429 if (!btrfs_trans_handle_cachep)
3431 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
3432 sizeof(struct btrfs_transaction),
3434 if (!btrfs_transaction_cachep)
3436 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
3437 sizeof(struct btrfs_path),
3439 if (!btrfs_path_cachep)
3441 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
3442 SLAB_DESTROY_BY_RCU, NULL);
3443 if (!btrfs_bit_radix_cachep)
3447 btrfs_destroy_cachep();
3451 static int btrfs_getattr(struct vfsmount *mnt,
3452 struct dentry *dentry, struct kstat *stat)
3454 struct inode *inode = dentry->d_inode;
3455 generic_fillattr(inode, stat);
3456 stat->blksize = PAGE_CACHE_SIZE;
3457 stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9);
3461 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
3462 struct inode * new_dir,struct dentry *new_dentry)
3464 struct btrfs_trans_handle *trans;
3465 struct btrfs_root *root = BTRFS_I(old_dir)->root;
3466 struct inode *new_inode = new_dentry->d_inode;
3467 struct inode *old_inode = old_dentry->d_inode;
3468 struct timespec ctime = CURRENT_TIME;
3469 struct btrfs_path *path;
3472 if (S_ISDIR(old_inode->i_mode) && new_inode &&
3473 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
3477 mutex_lock(&root->fs_info->fs_mutex);
3478 ret = btrfs_check_free_space(root, 1, 0);
3482 trans = btrfs_start_transaction(root, 1);
3484 btrfs_set_trans_block_group(trans, new_dir);
3485 path = btrfs_alloc_path();
3491 old_dentry->d_inode->i_nlink++;
3492 old_dir->i_ctime = old_dir->i_mtime = ctime;
3493 new_dir->i_ctime = new_dir->i_mtime = ctime;
3494 old_inode->i_ctime = ctime;
3496 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
3501 new_inode->i_ctime = CURRENT_TIME;
3502 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
3506 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
3511 btrfs_free_path(path);
3512 btrfs_end_transaction(trans, root);
3514 mutex_unlock(&root->fs_info->fs_mutex);
3518 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
3519 const char *symname)
3521 struct btrfs_trans_handle *trans;
3522 struct btrfs_root *root = BTRFS_I(dir)->root;
3523 struct btrfs_path *path;
3524 struct btrfs_key key;
3525 struct inode *inode = NULL;
3532 struct btrfs_file_extent_item *ei;
3533 struct extent_buffer *leaf;
3534 unsigned long nr = 0;
3536 name_len = strlen(symname) + 1;
3537 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
3538 return -ENAMETOOLONG;
3540 mutex_lock(&root->fs_info->fs_mutex);
3541 err = btrfs_check_free_space(root, 1, 0);
3545 trans = btrfs_start_transaction(root, 1);
3546 btrfs_set_trans_block_group(trans, dir);
3548 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
3554 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
3556 dentry->d_parent->d_inode->i_ino, objectid,
3557 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
3558 err = PTR_ERR(inode);
3562 btrfs_set_trans_block_group(trans, inode);
3563 err = btrfs_add_nondir(trans, dentry, inode, 0);
3567 inode->i_mapping->a_ops = &btrfs_aops;
3568 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
3569 inode->i_fop = &btrfs_file_operations;
3570 inode->i_op = &btrfs_file_inode_operations;
3571 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
3572 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
3573 inode->i_mapping, GFP_NOFS);
3574 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
3575 inode->i_mapping, GFP_NOFS);
3576 BTRFS_I(inode)->delalloc_bytes = 0;
3577 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
3578 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
3580 dir->i_sb->s_dirt = 1;
3581 btrfs_update_inode_block_group(trans, inode);
3582 btrfs_update_inode_block_group(trans, dir);
3586 path = btrfs_alloc_path();
3588 key.objectid = inode->i_ino;
3590 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
3591 datasize = btrfs_file_extent_calc_inline_size(name_len);
3592 err = btrfs_insert_empty_item(trans, root, path, &key,
3598 leaf = path->nodes[0];
3599 ei = btrfs_item_ptr(leaf, path->slots[0],
3600 struct btrfs_file_extent_item);
3601 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
3602 btrfs_set_file_extent_type(leaf, ei,
3603 BTRFS_FILE_EXTENT_INLINE);
3604 ptr = btrfs_file_extent_inline_start(ei);
3605 write_extent_buffer(leaf, symname, ptr, name_len);
3606 btrfs_mark_buffer_dirty(leaf);
3607 btrfs_free_path(path);
3609 inode->i_op = &btrfs_symlink_inode_operations;
3610 inode->i_mapping->a_ops = &btrfs_symlink_aops;
3611 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
3612 inode->i_size = name_len - 1;
3613 err = btrfs_update_inode(trans, root, inode);
3618 nr = trans->blocks_used;
3619 btrfs_end_transaction(trans, root);
3621 mutex_unlock(&root->fs_info->fs_mutex);
3623 inode_dec_link_count(inode);
3626 btrfs_btree_balance_dirty(root, nr);
3627 btrfs_throttle(root);
3631 static int btrfs_permission(struct inode *inode, int mask,
3632 struct nameidata *nd)
3634 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
3636 return generic_permission(inode, mask, NULL);
3639 static struct inode_operations btrfs_dir_inode_operations = {
3640 .lookup = btrfs_lookup,
3641 .create = btrfs_create,
3642 .unlink = btrfs_unlink,
3644 .mkdir = btrfs_mkdir,
3645 .rmdir = btrfs_rmdir,
3646 .rename = btrfs_rename,
3647 .symlink = btrfs_symlink,
3648 .setattr = btrfs_setattr,
3649 .mknod = btrfs_mknod,
3650 .setxattr = generic_setxattr,
3651 .getxattr = generic_getxattr,
3652 .listxattr = btrfs_listxattr,
3653 .removexattr = generic_removexattr,
3654 .permission = btrfs_permission,
3656 static struct inode_operations btrfs_dir_ro_inode_operations = {
3657 .lookup = btrfs_lookup,
3658 .permission = btrfs_permission,
3660 static struct file_operations btrfs_dir_file_operations = {
3661 .llseek = generic_file_llseek,
3662 .read = generic_read_dir,
3663 .readdir = btrfs_readdir,
3664 .unlocked_ioctl = btrfs_ioctl,
3665 #ifdef CONFIG_COMPAT
3666 .compat_ioctl = btrfs_ioctl,
3670 static struct extent_io_ops btrfs_extent_io_ops = {
3671 .fill_delalloc = run_delalloc_range,
3672 .submit_bio_hook = btrfs_submit_bio_hook,
3673 .merge_bio_hook = btrfs_merge_bio_hook,
3674 .readpage_io_hook = btrfs_readpage_io_hook,
3675 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
3676 .readpage_io_failed_hook = btrfs_io_failed_hook,
3677 .set_bit_hook = btrfs_set_bit_hook,
3678 .clear_bit_hook = btrfs_clear_bit_hook,
3681 static struct address_space_operations btrfs_aops = {
3682 .readpage = btrfs_readpage,
3683 .writepage = btrfs_writepage,
3684 .writepages = btrfs_writepages,
3685 .readpages = btrfs_readpages,
3686 .sync_page = block_sync_page,
3688 .direct_IO = btrfs_direct_IO,
3689 .invalidatepage = btrfs_invalidatepage,
3690 .releasepage = btrfs_releasepage,
3691 .set_page_dirty = __set_page_dirty_nobuffers,
3694 static struct address_space_operations btrfs_symlink_aops = {
3695 .readpage = btrfs_readpage,
3696 .writepage = btrfs_writepage,
3697 .invalidatepage = btrfs_invalidatepage,
3698 .releasepage = btrfs_releasepage,
3701 static struct inode_operations btrfs_file_inode_operations = {
3702 .truncate = btrfs_truncate,
3703 .getattr = btrfs_getattr,
3704 .setattr = btrfs_setattr,
3705 .setxattr = generic_setxattr,
3706 .getxattr = generic_getxattr,
3707 .listxattr = btrfs_listxattr,
3708 .removexattr = generic_removexattr,
3709 .permission = btrfs_permission,
3711 static struct inode_operations btrfs_special_inode_operations = {
3712 .getattr = btrfs_getattr,
3713 .setattr = btrfs_setattr,
3714 .permission = btrfs_permission,
3716 static struct inode_operations btrfs_symlink_inode_operations = {
3717 .readlink = generic_readlink,
3718 .follow_link = page_follow_link_light,
3719 .put_link = page_put_link,
3720 .permission = btrfs_permission,