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) {
860 /* if the inode isn't linked anywhere,
861 * we don't need to worry about
864 btrfs_del_ordered_inode(inode);
867 btrfs_end_transaction(trans, root);
869 mutex_unlock(&root->fs_info->fs_mutex);
870 btrfs_btree_balance_dirty(root, nr);
871 btrfs_throttle(root);
875 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
877 struct inode *inode = dentry->d_inode;
880 struct btrfs_root *root = BTRFS_I(dir)->root;
881 struct btrfs_trans_handle *trans;
882 unsigned long nr = 0;
884 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
887 mutex_lock(&root->fs_info->fs_mutex);
888 ret = btrfs_check_free_space(root, 1, 1);
892 trans = btrfs_start_transaction(root, 1);
893 btrfs_set_trans_block_group(trans, dir);
895 /* now the directory is empty */
896 err = btrfs_unlink_trans(trans, root, dir, dentry);
901 nr = trans->blocks_used;
902 ret = btrfs_end_transaction(trans, root);
904 mutex_unlock(&root->fs_info->fs_mutex);
905 btrfs_btree_balance_dirty(root, nr);
906 btrfs_throttle(root);
914 * this can truncate away extent items, csum items and directory items.
915 * It starts at a high offset and removes keys until it can't find
916 * any higher than i_size.
918 * csum items that cross the new i_size are truncated to the new size
921 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
922 struct btrfs_root *root,
927 struct btrfs_path *path;
928 struct btrfs_key key;
929 struct btrfs_key found_key;
931 struct extent_buffer *leaf;
932 struct btrfs_file_extent_item *fi;
933 u64 extent_start = 0;
934 u64 extent_num_bytes = 0;
940 int pending_del_nr = 0;
941 int pending_del_slot = 0;
942 int extent_type = -1;
943 u64 mask = root->sectorsize - 1;
945 btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1);
946 path = btrfs_alloc_path();
950 /* FIXME, add redo link to tree so we don't leak on crash */
951 key.objectid = inode->i_ino;
952 key.offset = (u64)-1;
955 btrfs_init_path(path);
957 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
962 BUG_ON(path->slots[0] == 0);
968 leaf = path->nodes[0];
969 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
970 found_type = btrfs_key_type(&found_key);
972 if (found_key.objectid != inode->i_ino)
975 if (found_type < min_type)
978 item_end = found_key.offset;
979 if (found_type == BTRFS_EXTENT_DATA_KEY) {
980 fi = btrfs_item_ptr(leaf, path->slots[0],
981 struct btrfs_file_extent_item);
982 extent_type = btrfs_file_extent_type(leaf, fi);
983 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
985 btrfs_file_extent_num_bytes(leaf, fi);
986 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
987 struct btrfs_item *item = btrfs_item_nr(leaf,
989 item_end += btrfs_file_extent_inline_len(leaf,
994 if (found_type == BTRFS_CSUM_ITEM_KEY) {
995 ret = btrfs_csum_truncate(trans, root, path,
999 if (item_end < inode->i_size) {
1000 if (found_type == BTRFS_DIR_ITEM_KEY) {
1001 found_type = BTRFS_INODE_ITEM_KEY;
1002 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
1003 found_type = BTRFS_CSUM_ITEM_KEY;
1004 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
1005 found_type = BTRFS_XATTR_ITEM_KEY;
1006 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
1007 found_type = BTRFS_INODE_REF_KEY;
1008 } else if (found_type) {
1013 btrfs_set_key_type(&key, found_type);
1016 if (found_key.offset >= inode->i_size)
1022 /* FIXME, shrink the extent if the ref count is only 1 */
1023 if (found_type != BTRFS_EXTENT_DATA_KEY)
1026 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
1028 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
1030 u64 orig_num_bytes =
1031 btrfs_file_extent_num_bytes(leaf, fi);
1032 extent_num_bytes = inode->i_size -
1033 found_key.offset + root->sectorsize - 1;
1034 extent_num_bytes = extent_num_bytes &
1035 ~((u64)root->sectorsize - 1);
1036 btrfs_set_file_extent_num_bytes(leaf, fi,
1038 num_dec = (orig_num_bytes -
1040 if (extent_start != 0)
1041 dec_i_blocks(inode, num_dec);
1042 btrfs_mark_buffer_dirty(leaf);
1045 btrfs_file_extent_disk_num_bytes(leaf,
1047 /* FIXME blocksize != 4096 */
1048 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
1049 if (extent_start != 0) {
1051 dec_i_blocks(inode, num_dec);
1053 root_gen = btrfs_header_generation(leaf);
1054 root_owner = btrfs_header_owner(leaf);
1056 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1058 u32 newsize = inode->i_size - found_key.offset;
1059 dec_i_blocks(inode, item_end + 1 -
1060 found_key.offset - newsize);
1062 btrfs_file_extent_calc_inline_size(newsize);
1063 ret = btrfs_truncate_item(trans, root, path,
1067 dec_i_blocks(inode, item_end + 1 -
1073 if (!pending_del_nr) {
1074 /* no pending yet, add ourselves */
1075 pending_del_slot = path->slots[0];
1077 } else if (pending_del_nr &&
1078 path->slots[0] + 1 == pending_del_slot) {
1079 /* hop on the pending chunk */
1081 pending_del_slot = path->slots[0];
1083 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
1089 ret = btrfs_free_extent(trans, root, extent_start,
1092 root_gen, inode->i_ino,
1093 found_key.offset, 0);
1097 if (path->slots[0] == 0) {
1100 btrfs_release_path(root, path);
1105 if (pending_del_nr &&
1106 path->slots[0] + 1 != pending_del_slot) {
1107 struct btrfs_key debug;
1109 btrfs_item_key_to_cpu(path->nodes[0], &debug,
1111 ret = btrfs_del_items(trans, root, path,
1116 btrfs_release_path(root, path);
1122 if (pending_del_nr) {
1123 ret = btrfs_del_items(trans, root, path, pending_del_slot,
1126 btrfs_release_path(root, path);
1127 btrfs_free_path(path);
1128 inode->i_sb->s_dirt = 1;
1132 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
1136 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1137 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1138 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1141 WARN_ON(!PageLocked(page));
1142 set_page_extent_mapped(page);
1144 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
1145 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
1146 page_end, GFP_NOFS);
1148 if (zero_start != PAGE_CACHE_SIZE) {
1150 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
1151 flush_dcache_page(page);
1154 set_page_dirty(page);
1155 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
1161 * taken from block_truncate_page, but does cow as it zeros out
1162 * any bytes left in the last page in the file.
1164 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
1166 struct inode *inode = mapping->host;
1167 struct btrfs_root *root = BTRFS_I(inode)->root;
1168 u32 blocksize = root->sectorsize;
1169 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1170 unsigned offset = from & (PAGE_CACHE_SIZE-1);
1175 if ((offset & (blocksize - 1)) == 0)
1180 page = grab_cache_page(mapping, index);
1183 if (!PageUptodate(page)) {
1184 ret = btrfs_readpage(NULL, page);
1186 if (page->mapping != mapping) {
1188 page_cache_release(page);
1191 if (!PageUptodate(page)) {
1197 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1198 wait_on_page_writeback(page);
1199 ret = btrfs_cow_one_page(inode, page, offset);
1202 page_cache_release(page);
1207 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
1209 struct inode *inode = dentry->d_inode;
1212 err = inode_change_ok(inode, attr);
1216 if (S_ISREG(inode->i_mode) &&
1217 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
1218 struct btrfs_trans_handle *trans;
1219 struct btrfs_root *root = BTRFS_I(inode)->root;
1220 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1222 u64 mask = root->sectorsize - 1;
1223 u64 hole_start = (inode->i_size + mask) & ~mask;
1224 u64 block_end = (attr->ia_size + mask) & ~mask;
1228 if (attr->ia_size <= hole_start)
1231 mutex_lock(&root->fs_info->fs_mutex);
1232 err = btrfs_check_free_space(root, 1, 0);
1233 mutex_unlock(&root->fs_info->fs_mutex);
1237 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1239 lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
1240 hole_size = block_end - hole_start;
1242 mutex_lock(&root->fs_info->fs_mutex);
1243 trans = btrfs_start_transaction(root, 1);
1244 btrfs_set_trans_block_group(trans, inode);
1245 err = btrfs_drop_extents(trans, root, inode,
1246 hole_start, block_end, hole_start,
1249 if (alloc_hint != EXTENT_MAP_INLINE) {
1250 err = btrfs_insert_file_extent(trans, root,
1254 btrfs_drop_extent_cache(inode, hole_start,
1256 btrfs_check_file(root, inode);
1258 btrfs_end_transaction(trans, root);
1259 mutex_unlock(&root->fs_info->fs_mutex);
1260 unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
1265 err = inode_setattr(inode, attr);
1270 void btrfs_delete_inode(struct inode *inode)
1272 struct btrfs_trans_handle *trans;
1273 struct btrfs_root *root = BTRFS_I(inode)->root;
1277 truncate_inode_pages(&inode->i_data, 0);
1278 if (is_bad_inode(inode)) {
1283 mutex_lock(&root->fs_info->fs_mutex);
1284 trans = btrfs_start_transaction(root, 1);
1286 btrfs_set_trans_block_group(trans, inode);
1287 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
1289 goto no_delete_lock;
1291 nr = trans->blocks_used;
1294 btrfs_end_transaction(trans, root);
1295 mutex_unlock(&root->fs_info->fs_mutex);
1296 btrfs_btree_balance_dirty(root, nr);
1297 btrfs_throttle(root);
1301 nr = trans->blocks_used;
1302 btrfs_end_transaction(trans, root);
1303 mutex_unlock(&root->fs_info->fs_mutex);
1304 btrfs_btree_balance_dirty(root, nr);
1305 btrfs_throttle(root);
1311 * this returns the key found in the dir entry in the location pointer.
1312 * If no dir entries were found, location->objectid is 0.
1314 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1315 struct btrfs_key *location)
1317 const char *name = dentry->d_name.name;
1318 int namelen = dentry->d_name.len;
1319 struct btrfs_dir_item *di;
1320 struct btrfs_path *path;
1321 struct btrfs_root *root = BTRFS_I(dir)->root;
1324 if (namelen == 1 && strcmp(name, ".") == 0) {
1325 location->objectid = dir->i_ino;
1326 location->type = BTRFS_INODE_ITEM_KEY;
1327 location->offset = 0;
1330 path = btrfs_alloc_path();
1333 if (namelen == 2 && strcmp(name, "..") == 0) {
1334 struct btrfs_key key;
1335 struct extent_buffer *leaf;
1339 key.objectid = dir->i_ino;
1340 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1342 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1346 leaf = path->nodes[0];
1347 slot = path->slots[0];
1348 nritems = btrfs_header_nritems(leaf);
1349 if (slot >= nritems)
1352 btrfs_item_key_to_cpu(leaf, &key, slot);
1353 if (key.objectid != dir->i_ino ||
1354 key.type != BTRFS_INODE_REF_KEY) {
1357 location->objectid = key.offset;
1358 location->type = BTRFS_INODE_ITEM_KEY;
1359 location->offset = 0;
1363 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1367 if (!di || IS_ERR(di)) {
1370 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
1372 btrfs_free_path(path);
1375 location->objectid = 0;
1380 * when we hit a tree root in a directory, the btrfs part of the inode
1381 * needs to be changed to reflect the root directory of the tree root. This
1382 * is kind of like crossing a mount point.
1384 static int fixup_tree_root_location(struct btrfs_root *root,
1385 struct btrfs_key *location,
1386 struct btrfs_root **sub_root,
1387 struct dentry *dentry)
1389 struct btrfs_path *path;
1390 struct btrfs_root_item *ri;
1392 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1394 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1397 path = btrfs_alloc_path();
1399 mutex_lock(&root->fs_info->fs_mutex);
1401 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1402 dentry->d_name.name,
1403 dentry->d_name.len);
1404 if (IS_ERR(*sub_root))
1405 return PTR_ERR(*sub_root);
1407 ri = &(*sub_root)->root_item;
1408 location->objectid = btrfs_root_dirid(ri);
1409 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1410 location->offset = 0;
1412 btrfs_free_path(path);
1413 mutex_unlock(&root->fs_info->fs_mutex);
1417 static int btrfs_init_locked_inode(struct inode *inode, void *p)
1419 struct btrfs_iget_args *args = p;
1420 inode->i_ino = args->ino;
1421 BTRFS_I(inode)->root = args->root;
1422 BTRFS_I(inode)->delalloc_bytes = 0;
1423 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1424 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1425 inode->i_mapping, GFP_NOFS);
1426 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1427 inode->i_mapping, GFP_NOFS);
1428 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
1432 static int btrfs_find_actor(struct inode *inode, void *opaque)
1434 struct btrfs_iget_args *args = opaque;
1435 return (args->ino == inode->i_ino &&
1436 args->root == BTRFS_I(inode)->root);
1439 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1442 struct btrfs_iget_args args;
1443 args.ino = objectid;
1444 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1449 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1452 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1453 struct btrfs_root *root)
1455 struct inode *inode;
1456 struct btrfs_iget_args args;
1457 args.ino = objectid;
1460 inode = iget5_locked(s, objectid, btrfs_find_actor,
1461 btrfs_init_locked_inode,
1466 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1467 struct nameidata *nd)
1469 struct inode * inode;
1470 struct btrfs_inode *bi = BTRFS_I(dir);
1471 struct btrfs_root *root = bi->root;
1472 struct btrfs_root *sub_root = root;
1473 struct btrfs_key location;
1476 if (dentry->d_name.len > BTRFS_NAME_LEN)
1477 return ERR_PTR(-ENAMETOOLONG);
1479 mutex_lock(&root->fs_info->fs_mutex);
1480 ret = btrfs_inode_by_name(dir, dentry, &location);
1481 mutex_unlock(&root->fs_info->fs_mutex);
1484 return ERR_PTR(ret);
1487 if (location.objectid) {
1488 ret = fixup_tree_root_location(root, &location, &sub_root,
1491 return ERR_PTR(ret);
1493 return ERR_PTR(-ENOENT);
1494 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1497 return ERR_PTR(-EACCES);
1498 if (inode->i_state & I_NEW) {
1499 /* the inode and parent dir are two different roots */
1500 if (sub_root != root) {
1502 sub_root->inode = inode;
1504 BTRFS_I(inode)->root = sub_root;
1505 memcpy(&BTRFS_I(inode)->location, &location,
1507 btrfs_read_locked_inode(inode);
1508 unlock_new_inode(inode);
1511 return d_splice_alias(inode, dentry);
1514 static unsigned char btrfs_filetype_table[] = {
1515 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1518 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1520 struct inode *inode = filp->f_dentry->d_inode;
1521 struct btrfs_root *root = BTRFS_I(inode)->root;
1522 struct btrfs_item *item;
1523 struct btrfs_dir_item *di;
1524 struct btrfs_key key;
1525 struct btrfs_key found_key;
1526 struct btrfs_path *path;
1529 struct extent_buffer *leaf;
1532 unsigned char d_type;
1537 int key_type = BTRFS_DIR_INDEX_KEY;
1542 /* FIXME, use a real flag for deciding about the key type */
1543 if (root->fs_info->tree_root == root)
1544 key_type = BTRFS_DIR_ITEM_KEY;
1546 /* special case for "." */
1547 if (filp->f_pos == 0) {
1548 over = filldir(dirent, ".", 1,
1556 mutex_lock(&root->fs_info->fs_mutex);
1557 key.objectid = inode->i_ino;
1558 path = btrfs_alloc_path();
1561 /* special case for .., just use the back ref */
1562 if (filp->f_pos == 1) {
1563 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1565 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1567 leaf = path->nodes[0];
1568 slot = path->slots[0];
1569 nritems = btrfs_header_nritems(leaf);
1570 if (slot >= nritems) {
1571 btrfs_release_path(root, path);
1572 goto read_dir_items;
1574 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1575 btrfs_release_path(root, path);
1576 if (found_key.objectid != key.objectid ||
1577 found_key.type != BTRFS_INODE_REF_KEY)
1578 goto read_dir_items;
1579 over = filldir(dirent, "..", 2,
1580 2, found_key.offset, DT_DIR);
1587 btrfs_set_key_type(&key, key_type);
1588 key.offset = filp->f_pos;
1590 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1595 leaf = path->nodes[0];
1596 nritems = btrfs_header_nritems(leaf);
1597 slot = path->slots[0];
1598 if (advance || slot >= nritems) {
1599 if (slot >= nritems -1) {
1600 ret = btrfs_next_leaf(root, path);
1603 leaf = path->nodes[0];
1604 nritems = btrfs_header_nritems(leaf);
1605 slot = path->slots[0];
1612 item = btrfs_item_nr(leaf, slot);
1613 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1615 if (found_key.objectid != key.objectid)
1617 if (btrfs_key_type(&found_key) != key_type)
1619 if (found_key.offset < filp->f_pos)
1622 filp->f_pos = found_key.offset;
1624 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1626 di_total = btrfs_item_size(leaf, item);
1627 while(di_cur < di_total) {
1628 struct btrfs_key location;
1630 name_len = btrfs_dir_name_len(leaf, di);
1631 if (name_len < 32) {
1632 name_ptr = tmp_name;
1634 name_ptr = kmalloc(name_len, GFP_NOFS);
1637 read_extent_buffer(leaf, name_ptr,
1638 (unsigned long)(di + 1), name_len);
1640 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1641 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1642 over = filldir(dirent, name_ptr, name_len,
1647 if (name_ptr != tmp_name)
1652 di_len = btrfs_dir_name_len(leaf, di) +
1653 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1655 di = (struct btrfs_dir_item *)((char *)di + di_len);
1658 if (key_type == BTRFS_DIR_INDEX_KEY)
1659 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1665 btrfs_release_path(root, path);
1666 btrfs_free_path(path);
1667 mutex_unlock(&root->fs_info->fs_mutex);
1671 int btrfs_write_inode(struct inode *inode, int wait)
1673 struct btrfs_root *root = BTRFS_I(inode)->root;
1674 struct btrfs_trans_handle *trans;
1678 mutex_lock(&root->fs_info->fs_mutex);
1679 trans = btrfs_start_transaction(root, 1);
1680 btrfs_set_trans_block_group(trans, inode);
1681 ret = btrfs_commit_transaction(trans, root);
1682 mutex_unlock(&root->fs_info->fs_mutex);
1688 * This is somewhat expensive, updating the tree every time the
1689 * inode changes. But, it is most likely to find the inode in cache.
1690 * FIXME, needs more benchmarking...there are no reasons other than performance
1691 * to keep or drop this code.
1693 void btrfs_dirty_inode(struct inode *inode)
1695 struct btrfs_root *root = BTRFS_I(inode)->root;
1696 struct btrfs_trans_handle *trans;
1698 mutex_lock(&root->fs_info->fs_mutex);
1699 trans = btrfs_start_transaction(root, 1);
1700 btrfs_set_trans_block_group(trans, inode);
1701 btrfs_update_inode(trans, root, inode);
1702 btrfs_end_transaction(trans, root);
1703 mutex_unlock(&root->fs_info->fs_mutex);
1706 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1707 struct btrfs_root *root,
1708 const char *name, int name_len,
1711 struct btrfs_block_group_cache *group,
1714 struct inode *inode;
1715 struct btrfs_inode_item *inode_item;
1716 struct btrfs_block_group_cache *new_inode_group;
1717 struct btrfs_key *location;
1718 struct btrfs_path *path;
1719 struct btrfs_inode_ref *ref;
1720 struct btrfs_key key[2];
1726 path = btrfs_alloc_path();
1729 inode = new_inode(root->fs_info->sb);
1731 return ERR_PTR(-ENOMEM);
1733 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1734 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1735 inode->i_mapping, GFP_NOFS);
1736 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1737 inode->i_mapping, GFP_NOFS);
1738 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
1739 BTRFS_I(inode)->delalloc_bytes = 0;
1740 BTRFS_I(inode)->root = root;
1746 new_inode_group = btrfs_find_block_group(root, group, 0,
1747 BTRFS_BLOCK_GROUP_METADATA, owner);
1748 if (!new_inode_group) {
1749 printk("find_block group failed\n");
1750 new_inode_group = group;
1752 BTRFS_I(inode)->block_group = new_inode_group;
1753 BTRFS_I(inode)->flags = 0;
1755 key[0].objectid = objectid;
1756 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1759 key[1].objectid = objectid;
1760 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1761 key[1].offset = ref_objectid;
1763 sizes[0] = sizeof(struct btrfs_inode_item);
1764 sizes[1] = name_len + sizeof(*ref);
1766 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1770 if (objectid > root->highest_inode)
1771 root->highest_inode = objectid;
1773 inode->i_uid = current->fsuid;
1774 inode->i_gid = current->fsgid;
1775 inode->i_mode = mode;
1776 inode->i_ino = objectid;
1777 inode->i_blocks = 0;
1778 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1779 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1780 struct btrfs_inode_item);
1781 fill_inode_item(path->nodes[0], inode_item, inode);
1783 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1784 struct btrfs_inode_ref);
1785 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1786 ptr = (unsigned long)(ref + 1);
1787 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1789 btrfs_mark_buffer_dirty(path->nodes[0]);
1790 btrfs_free_path(path);
1792 location = &BTRFS_I(inode)->location;
1793 location->objectid = objectid;
1794 location->offset = 0;
1795 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1797 insert_inode_hash(inode);
1800 btrfs_free_path(path);
1801 return ERR_PTR(ret);
1804 static inline u8 btrfs_inode_type(struct inode *inode)
1806 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1809 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1810 struct dentry *dentry, struct inode *inode,
1814 struct btrfs_key key;
1815 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1816 struct inode *parent_inode;
1818 key.objectid = inode->i_ino;
1819 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1822 ret = btrfs_insert_dir_item(trans, root,
1823 dentry->d_name.name, dentry->d_name.len,
1824 dentry->d_parent->d_inode->i_ino,
1825 &key, btrfs_inode_type(inode));
1828 ret = btrfs_insert_inode_ref(trans, root,
1829 dentry->d_name.name,
1832 dentry->d_parent->d_inode->i_ino);
1834 parent_inode = dentry->d_parent->d_inode;
1835 parent_inode->i_size += dentry->d_name.len * 2;
1836 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1837 ret = btrfs_update_inode(trans, root,
1838 dentry->d_parent->d_inode);
1843 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1844 struct dentry *dentry, struct inode *inode,
1847 int err = btrfs_add_link(trans, dentry, inode, backref);
1849 d_instantiate(dentry, inode);
1857 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1858 int mode, dev_t rdev)
1860 struct btrfs_trans_handle *trans;
1861 struct btrfs_root *root = BTRFS_I(dir)->root;
1862 struct inode *inode = NULL;
1866 unsigned long nr = 0;
1868 if (!new_valid_dev(rdev))
1871 mutex_lock(&root->fs_info->fs_mutex);
1872 err = btrfs_check_free_space(root, 1, 0);
1876 trans = btrfs_start_transaction(root, 1);
1877 btrfs_set_trans_block_group(trans, dir);
1879 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1885 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1887 dentry->d_parent->d_inode->i_ino, objectid,
1888 BTRFS_I(dir)->block_group, mode);
1889 err = PTR_ERR(inode);
1893 btrfs_set_trans_block_group(trans, inode);
1894 err = btrfs_add_nondir(trans, dentry, inode, 0);
1898 inode->i_op = &btrfs_special_inode_operations;
1899 init_special_inode(inode, inode->i_mode, rdev);
1900 btrfs_update_inode(trans, root, inode);
1902 dir->i_sb->s_dirt = 1;
1903 btrfs_update_inode_block_group(trans, inode);
1904 btrfs_update_inode_block_group(trans, dir);
1906 nr = trans->blocks_used;
1907 btrfs_end_transaction(trans, root);
1909 mutex_unlock(&root->fs_info->fs_mutex);
1912 inode_dec_link_count(inode);
1915 btrfs_btree_balance_dirty(root, nr);
1916 btrfs_throttle(root);
1920 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1921 int mode, struct nameidata *nd)
1923 struct btrfs_trans_handle *trans;
1924 struct btrfs_root *root = BTRFS_I(dir)->root;
1925 struct inode *inode = NULL;
1928 unsigned long nr = 0;
1931 mutex_lock(&root->fs_info->fs_mutex);
1932 err = btrfs_check_free_space(root, 1, 0);
1935 trans = btrfs_start_transaction(root, 1);
1936 btrfs_set_trans_block_group(trans, dir);
1938 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1944 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1946 dentry->d_parent->d_inode->i_ino,
1947 objectid, BTRFS_I(dir)->block_group, mode);
1948 err = PTR_ERR(inode);
1952 btrfs_set_trans_block_group(trans, inode);
1953 err = btrfs_add_nondir(trans, dentry, inode, 0);
1957 inode->i_mapping->a_ops = &btrfs_aops;
1958 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
1959 inode->i_fop = &btrfs_file_operations;
1960 inode->i_op = &btrfs_file_inode_operations;
1961 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1962 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1963 inode->i_mapping, GFP_NOFS);
1964 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1965 inode->i_mapping, GFP_NOFS);
1966 BTRFS_I(inode)->delalloc_bytes = 0;
1967 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
1968 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
1970 dir->i_sb->s_dirt = 1;
1971 btrfs_update_inode_block_group(trans, inode);
1972 btrfs_update_inode_block_group(trans, dir);
1974 nr = trans->blocks_used;
1975 btrfs_end_transaction(trans, root);
1977 mutex_unlock(&root->fs_info->fs_mutex);
1980 inode_dec_link_count(inode);
1983 btrfs_btree_balance_dirty(root, nr);
1984 btrfs_throttle(root);
1988 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1989 struct dentry *dentry)
1991 struct btrfs_trans_handle *trans;
1992 struct btrfs_root *root = BTRFS_I(dir)->root;
1993 struct inode *inode = old_dentry->d_inode;
1994 unsigned long nr = 0;
1998 if (inode->i_nlink == 0)
2001 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
2006 mutex_lock(&root->fs_info->fs_mutex);
2007 err = btrfs_check_free_space(root, 1, 0);
2010 trans = btrfs_start_transaction(root, 1);
2012 btrfs_set_trans_block_group(trans, dir);
2013 atomic_inc(&inode->i_count);
2014 err = btrfs_add_nondir(trans, dentry, inode, 1);
2019 dir->i_sb->s_dirt = 1;
2020 btrfs_update_inode_block_group(trans, dir);
2021 err = btrfs_update_inode(trans, root, inode);
2026 nr = trans->blocks_used;
2027 btrfs_end_transaction(trans, root);
2029 mutex_unlock(&root->fs_info->fs_mutex);
2032 inode_dec_link_count(inode);
2035 btrfs_btree_balance_dirty(root, nr);
2036 btrfs_throttle(root);
2040 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
2042 struct inode *inode = NULL;
2043 struct btrfs_trans_handle *trans;
2044 struct btrfs_root *root = BTRFS_I(dir)->root;
2046 int drop_on_err = 0;
2048 unsigned long nr = 1;
2050 mutex_lock(&root->fs_info->fs_mutex);
2051 err = btrfs_check_free_space(root, 1, 0);
2055 trans = btrfs_start_transaction(root, 1);
2056 btrfs_set_trans_block_group(trans, dir);
2058 if (IS_ERR(trans)) {
2059 err = PTR_ERR(trans);
2063 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2069 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2071 dentry->d_parent->d_inode->i_ino, objectid,
2072 BTRFS_I(dir)->block_group, S_IFDIR | mode);
2073 if (IS_ERR(inode)) {
2074 err = PTR_ERR(inode);
2079 inode->i_op = &btrfs_dir_inode_operations;
2080 inode->i_fop = &btrfs_dir_file_operations;
2081 btrfs_set_trans_block_group(trans, inode);
2084 err = btrfs_update_inode(trans, root, inode);
2088 err = btrfs_add_link(trans, dentry, inode, 0);
2092 d_instantiate(dentry, inode);
2094 dir->i_sb->s_dirt = 1;
2095 btrfs_update_inode_block_group(trans, inode);
2096 btrfs_update_inode_block_group(trans, dir);
2099 nr = trans->blocks_used;
2100 btrfs_end_transaction(trans, root);
2103 mutex_unlock(&root->fs_info->fs_mutex);
2106 btrfs_btree_balance_dirty(root, nr);
2107 btrfs_throttle(root);
2111 static int merge_extent_mapping(struct extent_map_tree *em_tree,
2112 struct extent_map *existing,
2113 struct extent_map *em)
2118 int real_blocks = existing->block_start < EXTENT_MAP_LAST_BYTE;
2120 if (real_blocks && em->block_start >= EXTENT_MAP_LAST_BYTE)
2123 if (!real_blocks && em->block_start != existing->block_start)
2126 new_end = max(existing->start + existing->len, em->start + em->len);
2128 if (existing->start >= em->start) {
2129 if (em->start + em->len < existing->start)
2132 start_diff = existing->start - em->start;
2133 if (real_blocks && em->block_start + start_diff !=
2134 existing->block_start)
2137 em->len = new_end - em->start;
2139 remove_extent_mapping(em_tree, existing);
2140 /* free for the tree */
2141 free_extent_map(existing);
2142 ret = add_extent_mapping(em_tree, em);
2144 } else if (em->start > existing->start) {
2146 if (existing->start + existing->len < em->start)
2149 start_diff = em->start - existing->start;
2150 if (real_blocks && existing->block_start + start_diff !=
2154 remove_extent_mapping(em_tree, existing);
2155 em->block_start = existing->block_start;
2156 em->start = existing->start;
2157 em->len = new_end - existing->start;
2158 free_extent_map(existing);
2160 ret = add_extent_mapping(em_tree, em);
2167 printk("invalid extent map merge [%Lu %Lu %Lu] [%Lu %Lu %Lu]\n",
2168 existing->start, existing->len, existing->block_start,
2169 em->start, em->len, em->block_start);
2173 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2174 size_t pg_offset, u64 start, u64 len,
2180 u64 extent_start = 0;
2182 u64 objectid = inode->i_ino;
2184 struct btrfs_path *path;
2185 struct btrfs_root *root = BTRFS_I(inode)->root;
2186 struct btrfs_file_extent_item *item;
2187 struct extent_buffer *leaf;
2188 struct btrfs_key found_key;
2189 struct extent_map *em = NULL;
2190 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2191 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2192 struct btrfs_trans_handle *trans = NULL;
2194 path = btrfs_alloc_path();
2196 mutex_lock(&root->fs_info->fs_mutex);
2199 spin_lock(&em_tree->lock);
2200 em = lookup_extent_mapping(em_tree, start, len);
2202 em->bdev = root->fs_info->fs_devices->latest_bdev;
2203 spin_unlock(&em_tree->lock);
2206 if (em->start > start || em->start + em->len <= start)
2207 free_extent_map(em);
2208 else if (em->block_start == EXTENT_MAP_INLINE && page)
2209 free_extent_map(em);
2213 em = alloc_extent_map(GFP_NOFS);
2219 em->start = EXTENT_MAP_HOLE;
2221 em->bdev = root->fs_info->fs_devices->latest_bdev;
2222 ret = btrfs_lookup_file_extent(trans, root, path,
2223 objectid, start, trans != NULL);
2230 if (path->slots[0] == 0)
2235 leaf = path->nodes[0];
2236 item = btrfs_item_ptr(leaf, path->slots[0],
2237 struct btrfs_file_extent_item);
2238 /* are we inside the extent that was found? */
2239 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2240 found_type = btrfs_key_type(&found_key);
2241 if (found_key.objectid != objectid ||
2242 found_type != BTRFS_EXTENT_DATA_KEY) {
2246 found_type = btrfs_file_extent_type(leaf, item);
2247 extent_start = found_key.offset;
2248 if (found_type == BTRFS_FILE_EXTENT_REG) {
2249 extent_end = extent_start +
2250 btrfs_file_extent_num_bytes(leaf, item);
2252 if (start < extent_start || start >= extent_end) {
2254 if (start < extent_start) {
2255 if (start + len <= extent_start)
2257 em->len = extent_end - extent_start;
2263 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
2265 em->start = extent_start;
2266 em->len = extent_end - extent_start;
2267 em->block_start = EXTENT_MAP_HOLE;
2270 bytenr += btrfs_file_extent_offset(leaf, item);
2271 em->block_start = bytenr;
2272 em->start = extent_start;
2273 em->len = extent_end - extent_start;
2275 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
2280 size_t extent_offset;
2283 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2285 extent_end = (extent_start + size + root->sectorsize - 1) &
2286 ~((u64)root->sectorsize - 1);
2287 if (start < extent_start || start >= extent_end) {
2289 if (start < extent_start) {
2290 if (start + len <= extent_start)
2292 em->len = extent_end - extent_start;
2298 em->block_start = EXTENT_MAP_INLINE;
2301 em->start = extent_start;
2306 page_start = page_offset(page) + pg_offset;
2307 extent_offset = page_start - extent_start;
2308 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
2309 size - extent_offset);
2310 em->start = extent_start + extent_offset;
2311 em->len = (copy_size + root->sectorsize - 1) &
2312 ~((u64)root->sectorsize - 1);
2314 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
2315 if (create == 0 && !PageUptodate(page)) {
2316 read_extent_buffer(leaf, map + pg_offset, ptr,
2318 flush_dcache_page(page);
2319 } else if (create && PageUptodate(page)) {
2322 free_extent_map(em);
2324 btrfs_release_path(root, path);
2325 trans = btrfs_start_transaction(root, 1);
2328 write_extent_buffer(leaf, map + pg_offset, ptr,
2330 btrfs_mark_buffer_dirty(leaf);
2333 set_extent_uptodate(io_tree, em->start,
2334 extent_map_end(em) - 1, GFP_NOFS);
2337 printk("unkknown found_type %d\n", found_type);
2344 em->block_start = EXTENT_MAP_HOLE;
2346 btrfs_release_path(root, path);
2347 if (em->start > start || extent_map_end(em) <= start) {
2348 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
2354 spin_lock(&em_tree->lock);
2355 ret = add_extent_mapping(em_tree, em);
2356 /* it is possible that someone inserted the extent into the tree
2357 * while we had the lock dropped. It is also possible that
2358 * an overlapping map exists in the tree
2360 if (ret == -EEXIST) {
2361 struct extent_map *existing;
2362 existing = lookup_extent_mapping(em_tree, start, len);
2363 if (existing && (existing->start > start ||
2364 existing->start + existing->len <= start)) {
2365 free_extent_map(existing);
2369 existing = lookup_extent_mapping(em_tree, em->start,
2372 err = merge_extent_mapping(em_tree, existing,
2374 free_extent_map(existing);
2376 free_extent_map(em);
2381 printk("failing to insert %Lu %Lu\n",
2383 free_extent_map(em);
2387 free_extent_map(em);
2391 spin_unlock(&em_tree->lock);
2393 btrfs_free_path(path);
2395 ret = btrfs_end_transaction(trans, root);
2399 mutex_unlock(&root->fs_info->fs_mutex);
2401 free_extent_map(em);
2403 return ERR_PTR(err);
2408 #if 0 /* waiting for O_DIRECT reads */
2409 static int btrfs_get_block(struct inode *inode, sector_t iblock,
2410 struct buffer_head *bh_result, int create)
2412 struct extent_map *em;
2413 u64 start = (u64)iblock << inode->i_blkbits;
2414 struct btrfs_multi_bio *multi = NULL;
2415 struct btrfs_root *root = BTRFS_I(inode)->root;
2421 em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0);
2423 if (!em || IS_ERR(em))
2426 if (em->start > start || em->start + em->len <= start) {
2430 if (em->block_start == EXTENT_MAP_INLINE) {
2435 len = em->start + em->len - start;
2436 len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size)));
2438 if (em->block_start == EXTENT_MAP_HOLE ||
2439 em->block_start == EXTENT_MAP_DELALLOC) {
2440 bh_result->b_size = len;
2444 logical = start - em->start;
2445 logical = em->block_start + logical;
2448 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
2449 logical, &map_length, &multi, 0);
2451 bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits;
2452 bh_result->b_size = min(map_length, len);
2454 bh_result->b_bdev = multi->stripes[0].dev->bdev;
2455 set_buffer_mapped(bh_result);
2458 free_extent_map(em);
2463 static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
2464 const struct iovec *iov, loff_t offset,
2465 unsigned long nr_segs)
2469 struct file *file = iocb->ki_filp;
2470 struct inode *inode = file->f_mapping->host;
2475 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2476 offset, nr_segs, btrfs_get_block, NULL);
2480 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
2482 return extent_bmap(mapping, iblock, btrfs_get_extent);
2485 int btrfs_readpage(struct file *file, struct page *page)
2487 struct extent_io_tree *tree;
2488 tree = &BTRFS_I(page->mapping->host)->io_tree;
2489 return extent_read_full_page(tree, page, btrfs_get_extent);
2492 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
2494 struct extent_io_tree *tree;
2497 if (current->flags & PF_MEMALLOC) {
2498 redirty_page_for_writepage(wbc, page);
2502 tree = &BTRFS_I(page->mapping->host)->io_tree;
2503 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
2506 static int btrfs_writepages(struct address_space *mapping,
2507 struct writeback_control *wbc)
2509 struct extent_io_tree *tree;
2510 tree = &BTRFS_I(mapping->host)->io_tree;
2511 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2515 btrfs_readpages(struct file *file, struct address_space *mapping,
2516 struct list_head *pages, unsigned nr_pages)
2518 struct extent_io_tree *tree;
2519 tree = &BTRFS_I(mapping->host)->io_tree;
2520 return extent_readpages(tree, mapping, pages, nr_pages,
2524 static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
2526 struct extent_io_tree *tree;
2527 struct extent_map_tree *map;
2530 tree = &BTRFS_I(page->mapping->host)->io_tree;
2531 map = &BTRFS_I(page->mapping->host)->extent_tree;
2532 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
2534 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
2535 ClearPagePrivate(page);
2536 set_page_private(page, 0);
2537 page_cache_release(page);
2542 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
2544 struct extent_io_tree *tree;
2546 tree = &BTRFS_I(page->mapping->host)->io_tree;
2547 extent_invalidatepage(tree, page, offset);
2548 btrfs_releasepage(page, GFP_NOFS);
2549 if (PagePrivate(page)) {
2550 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
2551 ClearPagePrivate(page);
2552 set_page_private(page, 0);
2553 page_cache_release(page);
2558 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2559 * called from a page fault handler when a page is first dirtied. Hence we must
2560 * be careful to check for EOF conditions here. We set the page up correctly
2561 * for a written page which means we get ENOSPC checking when writing into
2562 * holes and correct delalloc and unwritten extent mapping on filesystems that
2563 * support these features.
2565 * We are not allowed to take the i_mutex here so we have to play games to
2566 * protect against truncate races as the page could now be beyond EOF. Because
2567 * vmtruncate() writes the inode size before removing pages, once we have the
2568 * page lock we can determine safely if the page is beyond EOF. If it is not
2569 * beyond EOF, then the page is guaranteed safe against truncation until we
2572 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2574 struct inode *inode = fdentry(vma->vm_file)->d_inode;
2575 struct btrfs_root *root = BTRFS_I(inode)->root;
2581 mutex_lock(&root->fs_info->fs_mutex);
2582 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
2583 mutex_unlock(&root->fs_info->fs_mutex);
2590 wait_on_page_writeback(page);
2591 size = i_size_read(inode);
2592 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2594 if ((page->mapping != inode->i_mapping) ||
2595 (page_start > size)) {
2596 /* page got truncated out from underneath us */
2600 /* page is wholly or partially inside EOF */
2601 if (page_start + PAGE_CACHE_SIZE > size)
2602 end = size & ~PAGE_CACHE_MASK;
2604 end = PAGE_CACHE_SIZE;
2606 ret = btrfs_cow_one_page(inode, page, end);
2614 static void btrfs_truncate(struct inode *inode)
2616 struct btrfs_root *root = BTRFS_I(inode)->root;
2618 struct btrfs_trans_handle *trans;
2621 if (!S_ISREG(inode->i_mode))
2623 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2626 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2628 mutex_lock(&root->fs_info->fs_mutex);
2629 trans = btrfs_start_transaction(root, 1);
2630 btrfs_set_trans_block_group(trans, inode);
2632 /* FIXME, add redo link to tree so we don't leak on crash */
2633 ret = btrfs_truncate_in_trans(trans, root, inode,
2634 BTRFS_EXTENT_DATA_KEY);
2635 btrfs_update_inode(trans, root, inode);
2636 nr = trans->blocks_used;
2638 ret = btrfs_end_transaction(trans, root);
2640 mutex_unlock(&root->fs_info->fs_mutex);
2641 btrfs_btree_balance_dirty(root, nr);
2642 btrfs_throttle(root);
2645 static int noinline create_subvol(struct btrfs_root *root, char *name,
2648 struct btrfs_trans_handle *trans;
2649 struct btrfs_key key;
2650 struct btrfs_root_item root_item;
2651 struct btrfs_inode_item *inode_item;
2652 struct extent_buffer *leaf;
2653 struct btrfs_root *new_root = root;
2654 struct inode *inode;
2659 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2660 unsigned long nr = 1;
2662 mutex_lock(&root->fs_info->fs_mutex);
2663 ret = btrfs_check_free_space(root, 1, 0);
2667 trans = btrfs_start_transaction(root, 1);
2670 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2675 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2676 objectid, trans->transid, 0, 0,
2679 return PTR_ERR(leaf);
2681 btrfs_set_header_nritems(leaf, 0);
2682 btrfs_set_header_level(leaf, 0);
2683 btrfs_set_header_bytenr(leaf, leaf->start);
2684 btrfs_set_header_generation(leaf, trans->transid);
2685 btrfs_set_header_owner(leaf, objectid);
2687 write_extent_buffer(leaf, root->fs_info->fsid,
2688 (unsigned long)btrfs_header_fsid(leaf),
2690 btrfs_mark_buffer_dirty(leaf);
2692 inode_item = &root_item.inode;
2693 memset(inode_item, 0, sizeof(*inode_item));
2694 inode_item->generation = cpu_to_le64(1);
2695 inode_item->size = cpu_to_le64(3);
2696 inode_item->nlink = cpu_to_le32(1);
2697 inode_item->nblocks = cpu_to_le64(1);
2698 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
2700 btrfs_set_root_bytenr(&root_item, leaf->start);
2701 btrfs_set_root_level(&root_item, 0);
2702 btrfs_set_root_refs(&root_item, 1);
2703 btrfs_set_root_used(&root_item, 0);
2705 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2706 root_item.drop_level = 0;
2708 free_extent_buffer(leaf);
2711 btrfs_set_root_dirid(&root_item, new_dirid);
2713 key.objectid = objectid;
2715 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2716 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2722 * insert the directory item
2724 key.offset = (u64)-1;
2725 dir = root->fs_info->sb->s_root->d_inode;
2726 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2727 name, namelen, dir->i_ino, &key,
2732 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2733 name, namelen, objectid,
2734 root->fs_info->sb->s_root->d_inode->i_ino);
2738 ret = btrfs_commit_transaction(trans, root);
2742 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2745 trans = btrfs_start_transaction(new_root, 1);
2748 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2750 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2753 inode->i_op = &btrfs_dir_inode_operations;
2754 inode->i_fop = &btrfs_dir_file_operations;
2755 new_root->inode = inode;
2757 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2761 ret = btrfs_update_inode(trans, new_root, inode);
2765 nr = trans->blocks_used;
2766 err = btrfs_commit_transaction(trans, new_root);
2770 mutex_unlock(&root->fs_info->fs_mutex);
2771 btrfs_btree_balance_dirty(root, nr);
2772 btrfs_throttle(root);
2776 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2778 struct btrfs_pending_snapshot *pending_snapshot;
2779 struct btrfs_trans_handle *trans;
2782 unsigned long nr = 0;
2784 if (!root->ref_cows)
2787 mutex_lock(&root->fs_info->fs_mutex);
2788 ret = btrfs_check_free_space(root, 1, 0);
2792 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2793 if (!pending_snapshot) {
2797 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
2798 if (!pending_snapshot->name) {
2800 kfree(pending_snapshot);
2803 memcpy(pending_snapshot->name, name, namelen);
2804 pending_snapshot->name[namelen] = '\0';
2805 trans = btrfs_start_transaction(root, 1);
2807 pending_snapshot->root = root;
2808 list_add(&pending_snapshot->list,
2809 &trans->transaction->pending_snapshots);
2810 ret = btrfs_update_inode(trans, root, root->inode);
2811 err = btrfs_commit_transaction(trans, root);
2814 mutex_unlock(&root->fs_info->fs_mutex);
2815 btrfs_btree_balance_dirty(root, nr);
2816 btrfs_throttle(root);
2820 unsigned long btrfs_force_ra(struct address_space *mapping,
2821 struct file_ra_state *ra, struct file *file,
2822 pgoff_t offset, pgoff_t last_index)
2824 pgoff_t req_size = last_index - offset + 1;
2826 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2827 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2830 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2831 return offset + req_size;
2835 int btrfs_defrag_file(struct file *file) {
2836 struct inode *inode = fdentry(file)->d_inode;
2837 struct btrfs_root *root = BTRFS_I(inode)->root;
2838 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2840 unsigned long last_index;
2841 unsigned long ra_pages = root->fs_info->bdi.ra_pages;
2842 unsigned long total_read = 0;
2848 mutex_lock(&root->fs_info->fs_mutex);
2849 ret = btrfs_check_free_space(root, inode->i_size, 0);
2850 mutex_unlock(&root->fs_info->fs_mutex);
2854 mutex_lock(&inode->i_mutex);
2855 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2856 for (i = 0; i <= last_index; i++) {
2857 if (total_read % ra_pages == 0) {
2858 btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
2859 min(last_index, i + ra_pages - 1));
2862 page = grab_cache_page(inode->i_mapping, i);
2865 if (!PageUptodate(page)) {
2866 btrfs_readpage(NULL, page);
2868 if (!PageUptodate(page)) {
2870 page_cache_release(page);
2875 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
2876 ClearPageDirty(page);
2878 cancel_dirty_page(page, PAGE_CACHE_SIZE);
2880 wait_on_page_writeback(page);
2881 set_page_extent_mapped(page);
2883 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2884 page_end = page_start + PAGE_CACHE_SIZE - 1;
2886 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
2887 set_extent_delalloc(io_tree, page_start,
2888 page_end, GFP_NOFS);
2890 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
2891 set_page_dirty(page);
2893 page_cache_release(page);
2894 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2898 mutex_unlock(&inode->i_mutex);
2902 static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2907 struct btrfs_ioctl_vol_args *vol_args;
2908 struct btrfs_trans_handle *trans;
2909 struct btrfs_device *device = NULL;
2911 char *devstr = NULL;
2916 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2921 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2925 namelen = strlen(vol_args->name);
2926 if (namelen > BTRFS_VOL_NAME_MAX) {
2931 mutex_lock(&root->fs_info->fs_mutex);
2932 sizestr = vol_args->name;
2933 devstr = strchr(sizestr, ':');
2936 sizestr = devstr + 1;
2938 devstr = vol_args->name;
2939 devid = simple_strtoull(devstr, &end, 10);
2940 printk("resizing devid %Lu\n", devid);
2942 device = btrfs_find_device(root, devid, NULL);
2944 printk("resizer unable to find device %Lu\n", devid);
2948 if (!strcmp(sizestr, "max"))
2949 new_size = device->bdev->bd_inode->i_size;
2951 if (sizestr[0] == '-') {
2954 } else if (sizestr[0] == '+') {
2958 new_size = btrfs_parse_size(sizestr);
2959 if (new_size == 0) {
2965 old_size = device->total_bytes;
2968 if (new_size > old_size) {
2972 new_size = old_size - new_size;
2973 } else if (mod > 0) {
2974 new_size = old_size + new_size;
2977 if (new_size < 256 * 1024 * 1024) {
2981 if (new_size > device->bdev->bd_inode->i_size) {
2986 do_div(new_size, root->sectorsize);
2987 new_size *= root->sectorsize;
2989 printk("new size for %s is %llu\n", device->name, (unsigned long long)new_size);
2991 if (new_size > old_size) {
2992 trans = btrfs_start_transaction(root, 1);
2993 ret = btrfs_grow_device(trans, device, new_size);
2994 btrfs_commit_transaction(trans, root);
2996 ret = btrfs_shrink_device(device, new_size);
3000 mutex_unlock(&root->fs_info->fs_mutex);
3006 static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
3009 struct btrfs_ioctl_vol_args *vol_args;
3010 struct btrfs_dir_item *di;
3011 struct btrfs_path *path;
3016 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
3021 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3026 namelen = strlen(vol_args->name);
3027 if (namelen > BTRFS_VOL_NAME_MAX) {
3031 if (strchr(vol_args->name, '/')) {
3036 path = btrfs_alloc_path();
3042 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
3043 mutex_lock(&root->fs_info->fs_mutex);
3044 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
3046 vol_args->name, namelen, 0);
3047 mutex_unlock(&root->fs_info->fs_mutex);
3048 btrfs_free_path(path);
3050 if (di && !IS_ERR(di)) {
3060 if (root == root->fs_info->tree_root)
3061 ret = create_subvol(root, vol_args->name, namelen);
3063 ret = create_snapshot(root, vol_args->name, namelen);
3069 static int btrfs_ioctl_defrag(struct file *file)
3071 struct inode *inode = fdentry(file)->d_inode;
3072 struct btrfs_root *root = BTRFS_I(inode)->root;
3074 switch (inode->i_mode & S_IFMT) {
3076 mutex_lock(&root->fs_info->fs_mutex);
3077 btrfs_defrag_root(root, 0);
3078 btrfs_defrag_root(root->fs_info->extent_root, 0);
3079 mutex_unlock(&root->fs_info->fs_mutex);
3082 btrfs_defrag_file(file);
3089 long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
3091 struct btrfs_ioctl_vol_args *vol_args;
3094 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
3099 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3103 ret = btrfs_init_new_device(root, vol_args->name);
3110 long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg)
3112 struct btrfs_ioctl_vol_args *vol_args;
3115 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
3120 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3124 ret = btrfs_rm_device(root, vol_args->name);
3131 int dup_item_to_inode(struct btrfs_trans_handle *trans,
3132 struct btrfs_root *root,
3133 struct btrfs_path *path,
3134 struct extent_buffer *leaf,
3136 struct btrfs_key *key,
3140 int len = btrfs_item_size_nr(leaf, slot);
3141 struct btrfs_key ckey = *key;
3144 dup = kmalloc(len, GFP_NOFS);
3148 read_extent_buffer(leaf, dup, btrfs_item_ptr_offset(leaf, slot), len);
3149 btrfs_release_path(root, path);
3151 ckey.objectid = destino;
3152 ret = btrfs_insert_item(trans, root, &ckey, dup, len);
3157 long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
3159 struct inode *inode = fdentry(file)->d_inode;
3160 struct btrfs_root *root = BTRFS_I(inode)->root;
3161 struct file *src_file;
3163 struct btrfs_trans_handle *trans;
3166 struct btrfs_path *path;
3167 struct btrfs_key key;
3168 struct extent_buffer *leaf;
3172 src_file = fget(src_fd);
3175 src = src_file->f_dentry->d_inode;
3178 if (src->i_sb != inode->i_sb)
3182 mutex_lock(&inode->i_mutex);
3183 mutex_lock(&src->i_mutex);
3185 mutex_lock(&src->i_mutex);
3186 mutex_lock(&inode->i_mutex);
3193 /* do any pending delalloc/csum calc on src, one way or
3194 another, and lock file content */
3196 filemap_write_and_wait(src->i_mapping);
3197 lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
3198 if (BTRFS_I(src)->delalloc_bytes == 0)
3200 unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
3203 mutex_lock(&root->fs_info->fs_mutex);
3204 trans = btrfs_start_transaction(root, 0);
3205 path = btrfs_alloc_path();
3211 key.type = BTRFS_EXTENT_DATA_KEY;
3212 key.objectid = src->i_ino;
3218 * note the key will change type as we walk through the
3221 ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
3225 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3226 ret = btrfs_next_leaf(root, path);
3232 leaf = path->nodes[0];
3233 slot = path->slots[0];
3234 btrfs_item_key_to_cpu(leaf, &key, slot);
3235 nritems = btrfs_header_nritems(leaf);
3237 if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY ||
3238 key.objectid != src->i_ino)
3241 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
3242 struct btrfs_file_extent_item *extent;
3245 extent = btrfs_item_ptr(leaf, slot,
3246 struct btrfs_file_extent_item);
3247 found_type = btrfs_file_extent_type(leaf, extent);
3248 if (found_type == BTRFS_FILE_EXTENT_REG) {
3249 u64 len = btrfs_file_extent_num_bytes(leaf,
3251 u64 ds = btrfs_file_extent_disk_bytenr(leaf,
3253 u64 dl = btrfs_file_extent_disk_num_bytes(leaf,
3255 u64 off = btrfs_file_extent_offset(leaf,
3257 btrfs_insert_file_extent(trans, root,
3260 /* ds == 0 means there's a hole */
3262 btrfs_inc_extent_ref(trans, root,
3264 root->root_key.objectid,
3268 pos = key.offset + len;
3269 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
3270 ret = dup_item_to_inode(trans, root, path,
3275 pos = key.offset + btrfs_item_size_nr(leaf,
3278 } else if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
3279 ret = dup_item_to_inode(trans, root, path, leaf,
3280 slot, &key, inode->i_ino);
3286 btrfs_release_path(root, path);
3291 btrfs_free_path(path);
3293 inode->i_blocks = src->i_blocks;
3294 i_size_write(inode, src->i_size);
3295 btrfs_update_inode(trans, root, inode);
3297 unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
3299 btrfs_end_transaction(trans, root);
3300 mutex_unlock(&root->fs_info->fs_mutex);
3303 mutex_unlock(&src->i_mutex);
3304 mutex_unlock(&inode->i_mutex);
3310 long btrfs_ioctl(struct file *file, unsigned int
3311 cmd, unsigned long arg)
3313 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3316 case BTRFS_IOC_SNAP_CREATE:
3317 return btrfs_ioctl_snap_create(root, (void __user *)arg);
3318 case BTRFS_IOC_DEFRAG:
3319 return btrfs_ioctl_defrag(file);
3320 case BTRFS_IOC_RESIZE:
3321 return btrfs_ioctl_resize(root, (void __user *)arg);
3322 case BTRFS_IOC_ADD_DEV:
3323 return btrfs_ioctl_add_dev(root, (void __user *)arg);
3324 case BTRFS_IOC_RM_DEV:
3325 return btrfs_ioctl_rm_dev(root, (void __user *)arg);
3326 case BTRFS_IOC_BALANCE:
3327 return btrfs_balance(root->fs_info->dev_root);
3328 case BTRFS_IOC_CLONE:
3329 return btrfs_ioctl_clone(file, arg);
3336 * Called inside transaction, so use GFP_NOFS
3338 struct inode *btrfs_alloc_inode(struct super_block *sb)
3340 struct btrfs_inode *ei;
3342 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
3346 ei->ordered_trans = 0;
3347 return &ei->vfs_inode;
3350 void btrfs_destroy_inode(struct inode *inode)
3352 WARN_ON(!list_empty(&inode->i_dentry));
3353 WARN_ON(inode->i_data.nrpages);
3355 btrfs_drop_extent_cache(inode, 0, (u64)-1);
3356 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
3359 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3360 static void init_once(struct kmem_cache * cachep, void *foo)
3362 static void init_once(void * foo, struct kmem_cache * cachep,
3363 unsigned long flags)
3366 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
3368 inode_init_once(&ei->vfs_inode);
3371 void btrfs_destroy_cachep(void)
3373 if (btrfs_inode_cachep)
3374 kmem_cache_destroy(btrfs_inode_cachep);
3375 if (btrfs_trans_handle_cachep)
3376 kmem_cache_destroy(btrfs_trans_handle_cachep);
3377 if (btrfs_transaction_cachep)
3378 kmem_cache_destroy(btrfs_transaction_cachep);
3379 if (btrfs_bit_radix_cachep)
3380 kmem_cache_destroy(btrfs_bit_radix_cachep);
3381 if (btrfs_path_cachep)
3382 kmem_cache_destroy(btrfs_path_cachep);
3385 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
3386 unsigned long extra_flags,
3387 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3388 void (*ctor)(struct kmem_cache *, void *)
3390 void (*ctor)(void *, struct kmem_cache *,
3395 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
3396 SLAB_MEM_SPREAD | extra_flags), ctor
3397 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
3403 int btrfs_init_cachep(void)
3405 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
3406 sizeof(struct btrfs_inode),
3408 if (!btrfs_inode_cachep)
3410 btrfs_trans_handle_cachep =
3411 btrfs_cache_create("btrfs_trans_handle_cache",
3412 sizeof(struct btrfs_trans_handle),
3414 if (!btrfs_trans_handle_cachep)
3416 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
3417 sizeof(struct btrfs_transaction),
3419 if (!btrfs_transaction_cachep)
3421 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
3422 sizeof(struct btrfs_path),
3424 if (!btrfs_path_cachep)
3426 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
3427 SLAB_DESTROY_BY_RCU, NULL);
3428 if (!btrfs_bit_radix_cachep)
3432 btrfs_destroy_cachep();
3436 static int btrfs_getattr(struct vfsmount *mnt,
3437 struct dentry *dentry, struct kstat *stat)
3439 struct inode *inode = dentry->d_inode;
3440 generic_fillattr(inode, stat);
3441 stat->blksize = PAGE_CACHE_SIZE;
3442 stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9);
3446 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
3447 struct inode * new_dir,struct dentry *new_dentry)
3449 struct btrfs_trans_handle *trans;
3450 struct btrfs_root *root = BTRFS_I(old_dir)->root;
3451 struct inode *new_inode = new_dentry->d_inode;
3452 struct inode *old_inode = old_dentry->d_inode;
3453 struct timespec ctime = CURRENT_TIME;
3454 struct btrfs_path *path;
3457 if (S_ISDIR(old_inode->i_mode) && new_inode &&
3458 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
3462 mutex_lock(&root->fs_info->fs_mutex);
3463 ret = btrfs_check_free_space(root, 1, 0);
3467 trans = btrfs_start_transaction(root, 1);
3469 btrfs_set_trans_block_group(trans, new_dir);
3470 path = btrfs_alloc_path();
3476 old_dentry->d_inode->i_nlink++;
3477 old_dir->i_ctime = old_dir->i_mtime = ctime;
3478 new_dir->i_ctime = new_dir->i_mtime = ctime;
3479 old_inode->i_ctime = ctime;
3481 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
3486 new_inode->i_ctime = CURRENT_TIME;
3487 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
3491 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
3496 btrfs_free_path(path);
3497 btrfs_end_transaction(trans, root);
3499 mutex_unlock(&root->fs_info->fs_mutex);
3503 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
3504 const char *symname)
3506 struct btrfs_trans_handle *trans;
3507 struct btrfs_root *root = BTRFS_I(dir)->root;
3508 struct btrfs_path *path;
3509 struct btrfs_key key;
3510 struct inode *inode = NULL;
3517 struct btrfs_file_extent_item *ei;
3518 struct extent_buffer *leaf;
3519 unsigned long nr = 0;
3521 name_len = strlen(symname) + 1;
3522 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
3523 return -ENAMETOOLONG;
3525 mutex_lock(&root->fs_info->fs_mutex);
3526 err = btrfs_check_free_space(root, 1, 0);
3530 trans = btrfs_start_transaction(root, 1);
3531 btrfs_set_trans_block_group(trans, dir);
3533 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
3539 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
3541 dentry->d_parent->d_inode->i_ino, objectid,
3542 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
3543 err = PTR_ERR(inode);
3547 btrfs_set_trans_block_group(trans, inode);
3548 err = btrfs_add_nondir(trans, dentry, inode, 0);
3552 inode->i_mapping->a_ops = &btrfs_aops;
3553 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
3554 inode->i_fop = &btrfs_file_operations;
3555 inode->i_op = &btrfs_file_inode_operations;
3556 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
3557 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
3558 inode->i_mapping, GFP_NOFS);
3559 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
3560 inode->i_mapping, GFP_NOFS);
3561 BTRFS_I(inode)->delalloc_bytes = 0;
3562 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
3563 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
3565 dir->i_sb->s_dirt = 1;
3566 btrfs_update_inode_block_group(trans, inode);
3567 btrfs_update_inode_block_group(trans, dir);
3571 path = btrfs_alloc_path();
3573 key.objectid = inode->i_ino;
3575 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
3576 datasize = btrfs_file_extent_calc_inline_size(name_len);
3577 err = btrfs_insert_empty_item(trans, root, path, &key,
3583 leaf = path->nodes[0];
3584 ei = btrfs_item_ptr(leaf, path->slots[0],
3585 struct btrfs_file_extent_item);
3586 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
3587 btrfs_set_file_extent_type(leaf, ei,
3588 BTRFS_FILE_EXTENT_INLINE);
3589 ptr = btrfs_file_extent_inline_start(ei);
3590 write_extent_buffer(leaf, symname, ptr, name_len);
3591 btrfs_mark_buffer_dirty(leaf);
3592 btrfs_free_path(path);
3594 inode->i_op = &btrfs_symlink_inode_operations;
3595 inode->i_mapping->a_ops = &btrfs_symlink_aops;
3596 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
3597 inode->i_size = name_len - 1;
3598 err = btrfs_update_inode(trans, root, inode);
3603 nr = trans->blocks_used;
3604 btrfs_end_transaction(trans, root);
3606 mutex_unlock(&root->fs_info->fs_mutex);
3608 inode_dec_link_count(inode);
3611 btrfs_btree_balance_dirty(root, nr);
3612 btrfs_throttle(root);
3616 static int btrfs_permission(struct inode *inode, int mask,
3617 struct nameidata *nd)
3619 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
3621 return generic_permission(inode, mask, NULL);
3624 static struct inode_operations btrfs_dir_inode_operations = {
3625 .lookup = btrfs_lookup,
3626 .create = btrfs_create,
3627 .unlink = btrfs_unlink,
3629 .mkdir = btrfs_mkdir,
3630 .rmdir = btrfs_rmdir,
3631 .rename = btrfs_rename,
3632 .symlink = btrfs_symlink,
3633 .setattr = btrfs_setattr,
3634 .mknod = btrfs_mknod,
3635 .setxattr = generic_setxattr,
3636 .getxattr = generic_getxattr,
3637 .listxattr = btrfs_listxattr,
3638 .removexattr = generic_removexattr,
3639 .permission = btrfs_permission,
3641 static struct inode_operations btrfs_dir_ro_inode_operations = {
3642 .lookup = btrfs_lookup,
3643 .permission = btrfs_permission,
3645 static struct file_operations btrfs_dir_file_operations = {
3646 .llseek = generic_file_llseek,
3647 .read = generic_read_dir,
3648 .readdir = btrfs_readdir,
3649 .unlocked_ioctl = btrfs_ioctl,
3650 #ifdef CONFIG_COMPAT
3651 .compat_ioctl = btrfs_ioctl,
3655 static struct extent_io_ops btrfs_extent_io_ops = {
3656 .fill_delalloc = run_delalloc_range,
3657 .submit_bio_hook = btrfs_submit_bio_hook,
3658 .merge_bio_hook = btrfs_merge_bio_hook,
3659 .readpage_io_hook = btrfs_readpage_io_hook,
3660 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
3661 .readpage_io_failed_hook = btrfs_io_failed_hook,
3662 .set_bit_hook = btrfs_set_bit_hook,
3663 .clear_bit_hook = btrfs_clear_bit_hook,
3666 static struct address_space_operations btrfs_aops = {
3667 .readpage = btrfs_readpage,
3668 .writepage = btrfs_writepage,
3669 .writepages = btrfs_writepages,
3670 .readpages = btrfs_readpages,
3671 .sync_page = block_sync_page,
3673 .direct_IO = btrfs_direct_IO,
3674 .invalidatepage = btrfs_invalidatepage,
3675 .releasepage = btrfs_releasepage,
3676 .set_page_dirty = __set_page_dirty_nobuffers,
3679 static struct address_space_operations btrfs_symlink_aops = {
3680 .readpage = btrfs_readpage,
3681 .writepage = btrfs_writepage,
3682 .invalidatepage = btrfs_invalidatepage,
3683 .releasepage = btrfs_releasepage,
3686 static struct inode_operations btrfs_file_inode_operations = {
3687 .truncate = btrfs_truncate,
3688 .getattr = btrfs_getattr,
3689 .setattr = btrfs_setattr,
3690 .setxattr = generic_setxattr,
3691 .getxattr = generic_getxattr,
3692 .listxattr = btrfs_listxattr,
3693 .removexattr = generic_removexattr,
3694 .permission = btrfs_permission,
3696 static struct inode_operations btrfs_special_inode_operations = {
3697 .getattr = btrfs_getattr,
3698 .setattr = btrfs_setattr,
3699 .permission = btrfs_permission,
3701 static struct inode_operations btrfs_symlink_inode_operations = {
3702 .readlink = generic_readlink,
3703 .follow_link = page_follow_link_light,
3704 .put_link = page_put_link,
3705 .permission = btrfs_permission,