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 extent_buffer *leaf;
177 struct btrfs_path *path;
178 struct btrfs_file_extent_item *item;
181 struct btrfs_key found_key;
183 total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy);
184 path = btrfs_alloc_path();
187 ret = btrfs_lookup_file_extent(NULL, root, path,
188 inode->i_ino, start, 0);
190 btrfs_free_path(path);
196 if (path->slots[0] == 0)
201 leaf = path->nodes[0];
202 item = btrfs_item_ptr(leaf, path->slots[0],
203 struct btrfs_file_extent_item);
205 /* are we inside the extent that was found? */
206 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
207 found_type = btrfs_key_type(&found_key);
208 if (found_key.objectid != inode->i_ino ||
209 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);
234 * we may be called by the resizer, make sure we're inside
235 * the limits of the FS
237 if (bytenr + extent_num_bytes > total_fs_bytes)
240 if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) {
250 btrfs_free_path(path);
253 btrfs_release_path(root, path);
258 cow_file_range(inode, start, cow_end);
263 static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
265 struct btrfs_root *root = BTRFS_I(inode)->root;
267 mutex_lock(&root->fs_info->fs_mutex);
268 if (btrfs_test_opt(root, NODATACOW) ||
269 btrfs_test_flag(inode, NODATACOW))
270 ret = run_delalloc_nocow(inode, start, end);
272 ret = cow_file_range(inode, start, end);
274 mutex_unlock(&root->fs_info->fs_mutex);
278 int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
279 unsigned long old, unsigned long bits)
282 if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
283 struct btrfs_root *root = BTRFS_I(inode)->root;
284 spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
285 BTRFS_I(inode)->delalloc_bytes += end - start + 1;
286 root->fs_info->delalloc_bytes += end - start + 1;
287 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
292 int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
293 unsigned long old, unsigned long bits)
295 if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
296 struct btrfs_root *root = BTRFS_I(inode)->root;
299 spin_lock_irqsave(&root->fs_info->delalloc_lock, flags);
300 if (end - start + 1 > root->fs_info->delalloc_bytes) {
301 printk("warning: delalloc account %Lu %Lu\n",
302 end - start + 1, root->fs_info->delalloc_bytes);
303 root->fs_info->delalloc_bytes = 0;
304 BTRFS_I(inode)->delalloc_bytes = 0;
306 root->fs_info->delalloc_bytes -= end - start + 1;
307 BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
309 spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags);
314 int btrfs_merge_bio_hook(struct page *page, unsigned long offset,
315 size_t size, struct bio *bio)
317 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
318 struct btrfs_mapping_tree *map_tree;
319 u64 logical = bio->bi_sector << 9;
324 length = bio->bi_size;
325 map_tree = &root->fs_info->mapping_tree;
327 ret = btrfs_map_block(map_tree, READ, logical,
328 &map_length, NULL, 0);
330 if (map_length < length + size) {
336 int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
339 struct btrfs_root *root = BTRFS_I(inode)->root;
340 struct btrfs_trans_handle *trans;
344 ret = btrfs_csum_one_bio(root, bio, &sums);
347 mutex_lock(&root->fs_info->fs_mutex);
348 trans = btrfs_start_transaction(root, 1);
350 btrfs_set_trans_block_group(trans, inode);
351 btrfs_csum_file_blocks(trans, root, inode, bio, sums);
353 ret = btrfs_end_transaction(trans, root);
355 mutex_unlock(&root->fs_info->fs_mutex);
359 return btrfs_map_bio(root, rw, bio, mirror_num);
362 int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
365 struct btrfs_root *root = BTRFS_I(inode)->root;
368 if (!(rw & (1 << BIO_RW))) {
369 ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
374 if (btrfs_test_opt(root, NODATASUM) ||
375 btrfs_test_flag(inode, NODATASUM)) {
379 return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
380 inode, rw, bio, mirror_num,
381 __btrfs_submit_bio_hook);
383 return btrfs_map_bio(root, rw, bio, mirror_num);
386 int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
389 struct inode *inode = page->mapping->host;
390 struct btrfs_root *root = BTRFS_I(inode)->root;
391 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
392 struct btrfs_csum_item *item;
393 struct btrfs_path *path = NULL;
396 if (btrfs_test_opt(root, NODATASUM) ||
397 btrfs_test_flag(inode, NODATASUM))
400 mutex_lock(&root->fs_info->fs_mutex);
401 path = btrfs_alloc_path();
402 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
405 /* a csum that isn't present is a preallocated region. */
406 if (ret == -ENOENT || ret == -EFBIG)
409 printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start);
412 read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
414 set_state_private(io_tree, start, csum);
417 btrfs_free_path(path);
418 mutex_unlock(&root->fs_info->fs_mutex);
422 struct io_failure_record {
430 int btrfs_readpage_io_failed_hook(struct bio *failed_bio,
431 struct page *page, u64 start, u64 end,
432 struct extent_state *state)
434 struct io_failure_record *failrec = NULL;
436 struct extent_map *em;
437 struct inode *inode = page->mapping->host;
438 struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree;
439 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
445 ret = get_state_private(failure_tree, start, &private);
447 failrec = kmalloc(sizeof(*failrec), GFP_NOFS);
450 failrec->start = start;
451 failrec->len = end - start + 1;
452 failrec->last_mirror = 0;
454 spin_lock(&em_tree->lock);
455 em = lookup_extent_mapping(em_tree, start, failrec->len);
456 if (em->start > start || em->start + em->len < start) {
460 spin_unlock(&em_tree->lock);
462 if (!em || IS_ERR(em)) {
466 logical = start - em->start;
467 logical = em->block_start + logical;
468 failrec->logical = logical;
470 set_extent_bits(failure_tree, start, end, EXTENT_LOCKED |
471 EXTENT_DIRTY, GFP_NOFS);
472 set_state_private(failure_tree, start,
473 (u64)(unsigned long)failrec);
475 failrec = (struct io_failure_record *)(unsigned long)private;
477 num_copies = btrfs_num_copies(
478 &BTRFS_I(inode)->root->fs_info->mapping_tree,
479 failrec->logical, failrec->len);
480 failrec->last_mirror++;
482 spin_lock_irq(&BTRFS_I(inode)->io_tree.lock);
483 state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree,
486 if (state && state->start != failrec->start)
488 spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock);
490 if (!state || failrec->last_mirror > num_copies) {
491 set_state_private(failure_tree, failrec->start, 0);
492 clear_extent_bits(failure_tree, failrec->start,
493 failrec->start + failrec->len - 1,
494 EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS);
498 bio = bio_alloc(GFP_NOFS, 1);
499 bio->bi_private = state;
500 bio->bi_end_io = failed_bio->bi_end_io;
501 bio->bi_sector = failrec->logical >> 9;
502 bio->bi_bdev = failed_bio->bi_bdev;
504 bio_add_page(bio, page, failrec->len, start - page_offset(page));
505 btrfs_submit_bio_hook(inode, READ, bio, failrec->last_mirror);
509 int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end,
510 struct extent_state *state)
512 size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
513 struct inode *inode = page->mapping->host;
514 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
516 u64 private = ~(u32)0;
518 struct btrfs_root *root = BTRFS_I(inode)->root;
522 if (btrfs_test_opt(root, NODATASUM) ||
523 btrfs_test_flag(inode, NODATASUM))
525 if (state && state->start == start) {
526 private = state->private;
529 ret = get_state_private(io_tree, start, &private);
531 local_irq_save(flags);
532 kaddr = kmap_atomic(page, KM_IRQ0);
536 csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1);
537 btrfs_csum_final(csum, (char *)&csum);
538 if (csum != private) {
541 kunmap_atomic(kaddr, KM_IRQ0);
542 local_irq_restore(flags);
544 /* if the io failure tree for this inode is non-empty,
545 * check to see if we've recovered from a failed IO
548 if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private,
549 (u64)-1, 1, EXTENT_DIRTY)) {
551 struct io_failure_record *failure;
552 ret = get_state_private(&BTRFS_I(inode)->io_failure_tree,
553 start, &private_failure);
555 failure = (struct io_failure_record *)(unsigned long)
557 set_state_private(&BTRFS_I(inode)->io_failure_tree,
559 clear_extent_bits(&BTRFS_I(inode)->io_failure_tree,
561 failure->start + failure->len - 1,
562 EXTENT_DIRTY | EXTENT_LOCKED,
570 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
571 page->mapping->host->i_ino, (unsigned long long)start, csum,
573 memset(kaddr + offset, 1, end - start + 1);
574 flush_dcache_page(page);
575 kunmap_atomic(kaddr, KM_IRQ0);
576 local_irq_restore(flags);
582 void btrfs_read_locked_inode(struct inode *inode)
584 struct btrfs_path *path;
585 struct extent_buffer *leaf;
586 struct btrfs_inode_item *inode_item;
587 struct btrfs_timespec *tspec;
588 struct btrfs_root *root = BTRFS_I(inode)->root;
589 struct btrfs_key location;
590 u64 alloc_group_block;
594 path = btrfs_alloc_path();
596 mutex_lock(&root->fs_info->fs_mutex);
597 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
599 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
603 leaf = path->nodes[0];
604 inode_item = btrfs_item_ptr(leaf, path->slots[0],
605 struct btrfs_inode_item);
607 inode->i_mode = btrfs_inode_mode(leaf, inode_item);
608 inode->i_nlink = btrfs_inode_nlink(leaf, inode_item);
609 inode->i_uid = btrfs_inode_uid(leaf, inode_item);
610 inode->i_gid = btrfs_inode_gid(leaf, inode_item);
611 inode->i_size = btrfs_inode_size(leaf, inode_item);
613 tspec = btrfs_inode_atime(inode_item);
614 inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec);
615 inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
617 tspec = btrfs_inode_mtime(inode_item);
618 inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec);
619 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
621 tspec = btrfs_inode_ctime(inode_item);
622 inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec);
623 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec);
625 inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item);
626 inode->i_generation = btrfs_inode_generation(leaf, inode_item);
628 rdev = btrfs_inode_rdev(leaf, inode_item);
630 alloc_group_block = btrfs_inode_block_group(leaf, inode_item);
631 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
633 BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item);
634 if (!BTRFS_I(inode)->block_group) {
635 BTRFS_I(inode)->block_group = btrfs_find_block_group(root,
637 BTRFS_BLOCK_GROUP_METADATA, 0);
639 btrfs_free_path(path);
642 mutex_unlock(&root->fs_info->fs_mutex);
644 switch (inode->i_mode & S_IFMT) {
646 inode->i_mapping->a_ops = &btrfs_aops;
647 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
648 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
649 inode->i_fop = &btrfs_file_operations;
650 inode->i_op = &btrfs_file_inode_operations;
653 inode->i_fop = &btrfs_dir_file_operations;
654 if (root == root->fs_info->tree_root)
655 inode->i_op = &btrfs_dir_ro_inode_operations;
657 inode->i_op = &btrfs_dir_inode_operations;
660 inode->i_op = &btrfs_symlink_inode_operations;
661 inode->i_mapping->a_ops = &btrfs_symlink_aops;
662 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
665 init_special_inode(inode, inode->i_mode, rdev);
671 btrfs_release_path(root, path);
672 btrfs_free_path(path);
673 mutex_unlock(&root->fs_info->fs_mutex);
674 make_bad_inode(inode);
677 static void fill_inode_item(struct extent_buffer *leaf,
678 struct btrfs_inode_item *item,
681 btrfs_set_inode_uid(leaf, item, inode->i_uid);
682 btrfs_set_inode_gid(leaf, item, inode->i_gid);
683 btrfs_set_inode_size(leaf, item, inode->i_size);
684 btrfs_set_inode_mode(leaf, item, inode->i_mode);
685 btrfs_set_inode_nlink(leaf, item, inode->i_nlink);
687 btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item),
688 inode->i_atime.tv_sec);
689 btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item),
690 inode->i_atime.tv_nsec);
692 btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item),
693 inode->i_mtime.tv_sec);
694 btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item),
695 inode->i_mtime.tv_nsec);
697 btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item),
698 inode->i_ctime.tv_sec);
699 btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item),
700 inode->i_ctime.tv_nsec);
702 btrfs_set_inode_nblocks(leaf, item, inode->i_blocks);
703 btrfs_set_inode_generation(leaf, item, inode->i_generation);
704 btrfs_set_inode_rdev(leaf, item, inode->i_rdev);
705 btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags);
706 btrfs_set_inode_block_group(leaf, item,
707 BTRFS_I(inode)->block_group->key.objectid);
710 int btrfs_update_inode(struct btrfs_trans_handle *trans,
711 struct btrfs_root *root,
714 struct btrfs_inode_item *inode_item;
715 struct btrfs_path *path;
716 struct extent_buffer *leaf;
719 path = btrfs_alloc_path();
721 ret = btrfs_lookup_inode(trans, root, path,
722 &BTRFS_I(inode)->location, 1);
729 leaf = path->nodes[0];
730 inode_item = btrfs_item_ptr(leaf, path->slots[0],
731 struct btrfs_inode_item);
733 fill_inode_item(leaf, inode_item, inode);
734 btrfs_mark_buffer_dirty(leaf);
735 btrfs_set_inode_last_trans(trans, inode);
738 btrfs_release_path(root, path);
739 btrfs_free_path(path);
744 static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
745 struct btrfs_root *root,
747 struct dentry *dentry)
749 struct btrfs_path *path;
750 const char *name = dentry->d_name.name;
751 int name_len = dentry->d_name.len;
753 struct extent_buffer *leaf;
754 struct btrfs_dir_item *di;
755 struct btrfs_key key;
757 path = btrfs_alloc_path();
763 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
773 leaf = path->nodes[0];
774 btrfs_dir_item_key_to_cpu(leaf, di, &key);
775 ret = btrfs_delete_one_dir_name(trans, root, path, di);
778 btrfs_release_path(root, path);
780 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
781 key.objectid, name, name_len, -1);
790 ret = btrfs_delete_one_dir_name(trans, root, path, di);
792 dentry->d_inode->i_ctime = dir->i_ctime;
793 ret = btrfs_del_inode_ref(trans, root, name, name_len,
794 dentry->d_inode->i_ino,
795 dentry->d_parent->d_inode->i_ino);
797 printk("failed to delete reference to %.*s, "
798 "inode %lu parent %lu\n", name_len, name,
799 dentry->d_inode->i_ino,
800 dentry->d_parent->d_inode->i_ino);
803 btrfs_free_path(path);
805 dir->i_size -= name_len * 2;
806 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
807 btrfs_update_inode(trans, root, dir);
808 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
809 dentry->d_inode->i_nlink--;
811 drop_nlink(dentry->d_inode);
813 ret = btrfs_update_inode(trans, root, dentry->d_inode);
814 dir->i_sb->s_dirt = 1;
819 static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
821 struct btrfs_root *root;
822 struct btrfs_trans_handle *trans;
823 struct inode *inode = dentry->d_inode;
825 unsigned long nr = 0;
827 root = BTRFS_I(dir)->root;
828 mutex_lock(&root->fs_info->fs_mutex);
830 ret = btrfs_check_free_space(root, 1, 1);
834 trans = btrfs_start_transaction(root, 1);
836 btrfs_set_trans_block_group(trans, dir);
837 ret = btrfs_unlink_trans(trans, root, dir, dentry);
838 nr = trans->blocks_used;
840 if (inode->i_nlink == 0) {
842 /* if the inode isn't linked anywhere,
843 * we don't need to worry about
846 found = btrfs_del_ordered_inode(inode);
848 atomic_dec(&inode->i_count);
852 btrfs_end_transaction(trans, root);
854 mutex_unlock(&root->fs_info->fs_mutex);
855 btrfs_btree_balance_dirty(root, nr);
856 btrfs_throttle(root);
860 static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
862 struct inode *inode = dentry->d_inode;
865 struct btrfs_root *root = BTRFS_I(dir)->root;
866 struct btrfs_trans_handle *trans;
867 unsigned long nr = 0;
869 if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
872 mutex_lock(&root->fs_info->fs_mutex);
873 ret = btrfs_check_free_space(root, 1, 1);
877 trans = btrfs_start_transaction(root, 1);
878 btrfs_set_trans_block_group(trans, dir);
880 /* now the directory is empty */
881 err = btrfs_unlink_trans(trans, root, dir, dentry);
886 nr = trans->blocks_used;
887 ret = btrfs_end_transaction(trans, root);
889 mutex_unlock(&root->fs_info->fs_mutex);
890 btrfs_btree_balance_dirty(root, nr);
891 btrfs_throttle(root);
899 * this can truncate away extent items, csum items and directory items.
900 * It starts at a high offset and removes keys until it can't find
901 * any higher than i_size.
903 * csum items that cross the new i_size are truncated to the new size
906 static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
907 struct btrfs_root *root,
912 struct btrfs_path *path;
913 struct btrfs_key key;
914 struct btrfs_key found_key;
916 struct extent_buffer *leaf;
917 struct btrfs_file_extent_item *fi;
918 u64 extent_start = 0;
919 u64 extent_num_bytes = 0;
925 int pending_del_nr = 0;
926 int pending_del_slot = 0;
927 int extent_type = -1;
928 u64 mask = root->sectorsize - 1;
930 btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1);
931 path = btrfs_alloc_path();
935 /* FIXME, add redo link to tree so we don't leak on crash */
936 key.objectid = inode->i_ino;
937 key.offset = (u64)-1;
940 btrfs_init_path(path);
942 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
947 BUG_ON(path->slots[0] == 0);
953 leaf = path->nodes[0];
954 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
955 found_type = btrfs_key_type(&found_key);
957 if (found_key.objectid != inode->i_ino)
960 if (found_type < min_type)
963 item_end = found_key.offset;
964 if (found_type == BTRFS_EXTENT_DATA_KEY) {
965 fi = btrfs_item_ptr(leaf, path->slots[0],
966 struct btrfs_file_extent_item);
967 extent_type = btrfs_file_extent_type(leaf, fi);
968 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
970 btrfs_file_extent_num_bytes(leaf, fi);
971 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
972 struct btrfs_item *item = btrfs_item_nr(leaf,
974 item_end += btrfs_file_extent_inline_len(leaf,
979 if (found_type == BTRFS_CSUM_ITEM_KEY) {
980 ret = btrfs_csum_truncate(trans, root, path,
984 if (item_end < inode->i_size) {
985 if (found_type == BTRFS_DIR_ITEM_KEY) {
986 found_type = BTRFS_INODE_ITEM_KEY;
987 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
988 found_type = BTRFS_CSUM_ITEM_KEY;
989 } else if (found_type == BTRFS_EXTENT_DATA_KEY) {
990 found_type = BTRFS_XATTR_ITEM_KEY;
991 } else if (found_type == BTRFS_XATTR_ITEM_KEY) {
992 found_type = BTRFS_INODE_REF_KEY;
993 } else if (found_type) {
998 btrfs_set_key_type(&key, found_type);
1001 if (found_key.offset >= inode->i_size)
1007 /* FIXME, shrink the extent if the ref count is only 1 */
1008 if (found_type != BTRFS_EXTENT_DATA_KEY)
1011 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
1013 extent_start = btrfs_file_extent_disk_bytenr(leaf, fi);
1015 u64 orig_num_bytes =
1016 btrfs_file_extent_num_bytes(leaf, fi);
1017 extent_num_bytes = inode->i_size -
1018 found_key.offset + root->sectorsize - 1;
1019 extent_num_bytes = extent_num_bytes &
1020 ~((u64)root->sectorsize - 1);
1021 btrfs_set_file_extent_num_bytes(leaf, fi,
1023 num_dec = (orig_num_bytes -
1025 if (extent_start != 0)
1026 dec_i_blocks(inode, num_dec);
1027 btrfs_mark_buffer_dirty(leaf);
1030 btrfs_file_extent_disk_num_bytes(leaf,
1032 /* FIXME blocksize != 4096 */
1033 num_dec = btrfs_file_extent_num_bytes(leaf, fi);
1034 if (extent_start != 0) {
1036 dec_i_blocks(inode, num_dec);
1038 root_gen = btrfs_header_generation(leaf);
1039 root_owner = btrfs_header_owner(leaf);
1041 } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
1043 u32 newsize = inode->i_size - found_key.offset;
1044 dec_i_blocks(inode, item_end + 1 -
1045 found_key.offset - newsize);
1047 btrfs_file_extent_calc_inline_size(newsize);
1048 ret = btrfs_truncate_item(trans, root, path,
1052 dec_i_blocks(inode, item_end + 1 -
1058 if (!pending_del_nr) {
1059 /* no pending yet, add ourselves */
1060 pending_del_slot = path->slots[0];
1062 } else if (pending_del_nr &&
1063 path->slots[0] + 1 == pending_del_slot) {
1064 /* hop on the pending chunk */
1066 pending_del_slot = path->slots[0];
1068 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot);
1074 ret = btrfs_free_extent(trans, root, extent_start,
1077 root_gen, inode->i_ino,
1078 found_key.offset, 0);
1082 if (path->slots[0] == 0) {
1085 btrfs_release_path(root, path);
1090 if (pending_del_nr &&
1091 path->slots[0] + 1 != pending_del_slot) {
1092 struct btrfs_key debug;
1094 btrfs_item_key_to_cpu(path->nodes[0], &debug,
1096 ret = btrfs_del_items(trans, root, path,
1101 btrfs_release_path(root, path);
1107 if (pending_del_nr) {
1108 ret = btrfs_del_items(trans, root, path, pending_del_slot,
1111 btrfs_release_path(root, path);
1112 btrfs_free_path(path);
1113 inode->i_sb->s_dirt = 1;
1117 static int btrfs_cow_one_page(struct inode *inode, struct page *page,
1121 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1122 u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1123 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
1126 WARN_ON(!PageLocked(page));
1127 set_page_extent_mapped(page);
1129 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
1130 set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
1131 page_end, GFP_NOFS);
1133 if (zero_start != PAGE_CACHE_SIZE) {
1135 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
1136 flush_dcache_page(page);
1139 set_page_dirty(page);
1140 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
1146 * taken from block_truncate_page, but does cow as it zeros out
1147 * any bytes left in the last page in the file.
1149 static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
1151 struct inode *inode = mapping->host;
1152 struct btrfs_root *root = BTRFS_I(inode)->root;
1153 u32 blocksize = root->sectorsize;
1154 pgoff_t index = from >> PAGE_CACHE_SHIFT;
1155 unsigned offset = from & (PAGE_CACHE_SIZE-1);
1160 if ((offset & (blocksize - 1)) == 0)
1164 page = grab_cache_page(mapping, index);
1167 if (!PageUptodate(page)) {
1168 ret = btrfs_readpage(NULL, page);
1170 if (!PageUptodate(page)) {
1175 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
1177 ret = btrfs_cow_one_page(inode, page, offset);
1180 page_cache_release(page);
1185 static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
1187 struct inode *inode = dentry->d_inode;
1190 err = inode_change_ok(inode, attr);
1194 if (S_ISREG(inode->i_mode) &&
1195 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
1196 struct btrfs_trans_handle *trans;
1197 struct btrfs_root *root = BTRFS_I(inode)->root;
1198 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
1200 u64 mask = root->sectorsize - 1;
1201 u64 hole_start = (inode->i_size + mask) & ~mask;
1202 u64 block_end = (attr->ia_size + mask) & ~mask;
1206 if (attr->ia_size <= hole_start)
1209 mutex_lock(&root->fs_info->fs_mutex);
1210 err = btrfs_check_free_space(root, 1, 0);
1211 mutex_unlock(&root->fs_info->fs_mutex);
1215 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1217 lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
1218 hole_size = block_end - hole_start;
1220 mutex_lock(&root->fs_info->fs_mutex);
1221 trans = btrfs_start_transaction(root, 1);
1222 btrfs_set_trans_block_group(trans, inode);
1223 err = btrfs_drop_extents(trans, root, inode,
1224 hole_start, block_end, hole_start,
1227 if (alloc_hint != EXTENT_MAP_INLINE) {
1228 err = btrfs_insert_file_extent(trans, root,
1232 btrfs_drop_extent_cache(inode, hole_start,
1234 btrfs_check_file(root, inode);
1236 btrfs_end_transaction(trans, root);
1237 mutex_unlock(&root->fs_info->fs_mutex);
1238 unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS);
1243 err = inode_setattr(inode, attr);
1248 void btrfs_put_inode(struct inode *inode)
1252 if (!BTRFS_I(inode)->ordered_trans) {
1256 if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) ||
1257 mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK))
1260 ret = btrfs_del_ordered_inode(inode);
1262 atomic_dec(&inode->i_count);
1266 void btrfs_delete_inode(struct inode *inode)
1268 struct btrfs_trans_handle *trans;
1269 struct btrfs_root *root = BTRFS_I(inode)->root;
1273 truncate_inode_pages(&inode->i_data, 0);
1274 if (is_bad_inode(inode)) {
1279 mutex_lock(&root->fs_info->fs_mutex);
1280 trans = btrfs_start_transaction(root, 1);
1282 btrfs_set_trans_block_group(trans, inode);
1283 ret = btrfs_truncate_in_trans(trans, root, inode, 0);
1285 goto no_delete_lock;
1287 nr = trans->blocks_used;
1290 btrfs_end_transaction(trans, root);
1291 mutex_unlock(&root->fs_info->fs_mutex);
1292 btrfs_btree_balance_dirty(root, nr);
1293 btrfs_throttle(root);
1297 nr = trans->blocks_used;
1298 btrfs_end_transaction(trans, root);
1299 mutex_unlock(&root->fs_info->fs_mutex);
1300 btrfs_btree_balance_dirty(root, nr);
1301 btrfs_throttle(root);
1307 * this returns the key found in the dir entry in the location pointer.
1308 * If no dir entries were found, location->objectid is 0.
1310 static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
1311 struct btrfs_key *location)
1313 const char *name = dentry->d_name.name;
1314 int namelen = dentry->d_name.len;
1315 struct btrfs_dir_item *di;
1316 struct btrfs_path *path;
1317 struct btrfs_root *root = BTRFS_I(dir)->root;
1320 if (namelen == 1 && strcmp(name, ".") == 0) {
1321 location->objectid = dir->i_ino;
1322 location->type = BTRFS_INODE_ITEM_KEY;
1323 location->offset = 0;
1326 path = btrfs_alloc_path();
1329 if (namelen == 2 && strcmp(name, "..") == 0) {
1330 struct btrfs_key key;
1331 struct extent_buffer *leaf;
1335 key.objectid = dir->i_ino;
1336 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1338 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1342 leaf = path->nodes[0];
1343 slot = path->slots[0];
1344 nritems = btrfs_header_nritems(leaf);
1345 if (slot >= nritems)
1348 btrfs_item_key_to_cpu(leaf, &key, slot);
1349 if (key.objectid != dir->i_ino ||
1350 key.type != BTRFS_INODE_REF_KEY) {
1353 location->objectid = key.offset;
1354 location->type = BTRFS_INODE_ITEM_KEY;
1355 location->offset = 0;
1359 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
1363 if (!di || IS_ERR(di)) {
1366 btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
1368 btrfs_free_path(path);
1371 location->objectid = 0;
1376 * when we hit a tree root in a directory, the btrfs part of the inode
1377 * needs to be changed to reflect the root directory of the tree root. This
1378 * is kind of like crossing a mount point.
1380 static int fixup_tree_root_location(struct btrfs_root *root,
1381 struct btrfs_key *location,
1382 struct btrfs_root **sub_root,
1383 struct dentry *dentry)
1385 struct btrfs_path *path;
1386 struct btrfs_root_item *ri;
1388 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
1390 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
1393 path = btrfs_alloc_path();
1395 mutex_lock(&root->fs_info->fs_mutex);
1397 *sub_root = btrfs_read_fs_root(root->fs_info, location,
1398 dentry->d_name.name,
1399 dentry->d_name.len);
1400 if (IS_ERR(*sub_root))
1401 return PTR_ERR(*sub_root);
1403 ri = &(*sub_root)->root_item;
1404 location->objectid = btrfs_root_dirid(ri);
1405 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1406 location->offset = 0;
1408 btrfs_free_path(path);
1409 mutex_unlock(&root->fs_info->fs_mutex);
1413 static int btrfs_init_locked_inode(struct inode *inode, void *p)
1415 struct btrfs_iget_args *args = p;
1416 inode->i_ino = args->ino;
1417 BTRFS_I(inode)->root = args->root;
1418 BTRFS_I(inode)->delalloc_bytes = 0;
1419 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1420 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1421 inode->i_mapping, GFP_NOFS);
1422 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1423 inode->i_mapping, GFP_NOFS);
1424 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
1428 static int btrfs_find_actor(struct inode *inode, void *opaque)
1430 struct btrfs_iget_args *args = opaque;
1431 return (args->ino == inode->i_ino &&
1432 args->root == BTRFS_I(inode)->root);
1435 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1438 struct btrfs_iget_args args;
1439 args.ino = objectid;
1440 args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid);
1445 return ilookup5(s, objectid, btrfs_find_actor, (void *)&args);
1448 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1449 struct btrfs_root *root)
1451 struct inode *inode;
1452 struct btrfs_iget_args args;
1453 args.ino = objectid;
1456 inode = iget5_locked(s, objectid, btrfs_find_actor,
1457 btrfs_init_locked_inode,
1462 static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
1463 struct nameidata *nd)
1465 struct inode * inode;
1466 struct btrfs_inode *bi = BTRFS_I(dir);
1467 struct btrfs_root *root = bi->root;
1468 struct btrfs_root *sub_root = root;
1469 struct btrfs_key location;
1472 if (dentry->d_name.len > BTRFS_NAME_LEN)
1473 return ERR_PTR(-ENAMETOOLONG);
1475 mutex_lock(&root->fs_info->fs_mutex);
1476 ret = btrfs_inode_by_name(dir, dentry, &location);
1477 mutex_unlock(&root->fs_info->fs_mutex);
1480 return ERR_PTR(ret);
1483 if (location.objectid) {
1484 ret = fixup_tree_root_location(root, &location, &sub_root,
1487 return ERR_PTR(ret);
1489 return ERR_PTR(-ENOENT);
1490 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
1493 return ERR_PTR(-EACCES);
1494 if (inode->i_state & I_NEW) {
1495 /* the inode and parent dir are two different roots */
1496 if (sub_root != root) {
1498 sub_root->inode = inode;
1500 BTRFS_I(inode)->root = sub_root;
1501 memcpy(&BTRFS_I(inode)->location, &location,
1503 btrfs_read_locked_inode(inode);
1504 unlock_new_inode(inode);
1507 return d_splice_alias(inode, dentry);
1510 static unsigned char btrfs_filetype_table[] = {
1511 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
1514 static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
1516 struct inode *inode = filp->f_dentry->d_inode;
1517 struct btrfs_root *root = BTRFS_I(inode)->root;
1518 struct btrfs_item *item;
1519 struct btrfs_dir_item *di;
1520 struct btrfs_key key;
1521 struct btrfs_key found_key;
1522 struct btrfs_path *path;
1525 struct extent_buffer *leaf;
1528 unsigned char d_type;
1533 int key_type = BTRFS_DIR_INDEX_KEY;
1538 /* FIXME, use a real flag for deciding about the key type */
1539 if (root->fs_info->tree_root == root)
1540 key_type = BTRFS_DIR_ITEM_KEY;
1542 /* special case for "." */
1543 if (filp->f_pos == 0) {
1544 over = filldir(dirent, ".", 1,
1552 mutex_lock(&root->fs_info->fs_mutex);
1553 key.objectid = inode->i_ino;
1554 path = btrfs_alloc_path();
1557 /* special case for .., just use the back ref */
1558 if (filp->f_pos == 1) {
1559 btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
1561 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1563 leaf = path->nodes[0];
1564 slot = path->slots[0];
1565 nritems = btrfs_header_nritems(leaf);
1566 if (slot >= nritems) {
1567 btrfs_release_path(root, path);
1568 goto read_dir_items;
1570 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1571 btrfs_release_path(root, path);
1572 if (found_key.objectid != key.objectid ||
1573 found_key.type != BTRFS_INODE_REF_KEY)
1574 goto read_dir_items;
1575 over = filldir(dirent, "..", 2,
1576 2, found_key.offset, DT_DIR);
1583 btrfs_set_key_type(&key, key_type);
1584 key.offset = filp->f_pos;
1586 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1591 leaf = path->nodes[0];
1592 nritems = btrfs_header_nritems(leaf);
1593 slot = path->slots[0];
1594 if (advance || slot >= nritems) {
1595 if (slot >= nritems -1) {
1596 ret = btrfs_next_leaf(root, path);
1599 leaf = path->nodes[0];
1600 nritems = btrfs_header_nritems(leaf);
1601 slot = path->slots[0];
1608 item = btrfs_item_nr(leaf, slot);
1609 btrfs_item_key_to_cpu(leaf, &found_key, slot);
1611 if (found_key.objectid != key.objectid)
1613 if (btrfs_key_type(&found_key) != key_type)
1615 if (found_key.offset < filp->f_pos)
1618 filp->f_pos = found_key.offset;
1620 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1622 di_total = btrfs_item_size(leaf, item);
1623 while(di_cur < di_total) {
1624 struct btrfs_key location;
1626 name_len = btrfs_dir_name_len(leaf, di);
1627 if (name_len < 32) {
1628 name_ptr = tmp_name;
1630 name_ptr = kmalloc(name_len, GFP_NOFS);
1633 read_extent_buffer(leaf, name_ptr,
1634 (unsigned long)(di + 1), name_len);
1636 d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)];
1637 btrfs_dir_item_key_to_cpu(leaf, di, &location);
1638 over = filldir(dirent, name_ptr, name_len,
1643 if (name_ptr != tmp_name)
1648 di_len = btrfs_dir_name_len(leaf, di) +
1649 btrfs_dir_data_len(leaf, di) +sizeof(*di);
1651 di = (struct btrfs_dir_item *)((char *)di + di_len);
1654 if (key_type == BTRFS_DIR_INDEX_KEY)
1655 filp->f_pos = INT_LIMIT(typeof(filp->f_pos));
1661 btrfs_release_path(root, path);
1662 btrfs_free_path(path);
1663 mutex_unlock(&root->fs_info->fs_mutex);
1667 int btrfs_write_inode(struct inode *inode, int wait)
1669 struct btrfs_root *root = BTRFS_I(inode)->root;
1670 struct btrfs_trans_handle *trans;
1674 mutex_lock(&root->fs_info->fs_mutex);
1675 trans = btrfs_start_transaction(root, 1);
1676 btrfs_set_trans_block_group(trans, inode);
1677 ret = btrfs_commit_transaction(trans, root);
1678 mutex_unlock(&root->fs_info->fs_mutex);
1684 * This is somewhat expensive, updating the tree every time the
1685 * inode changes. But, it is most likely to find the inode in cache.
1686 * FIXME, needs more benchmarking...there are no reasons other than performance
1687 * to keep or drop this code.
1689 void btrfs_dirty_inode(struct inode *inode)
1691 struct btrfs_root *root = BTRFS_I(inode)->root;
1692 struct btrfs_trans_handle *trans;
1694 mutex_lock(&root->fs_info->fs_mutex);
1695 trans = btrfs_start_transaction(root, 1);
1696 btrfs_set_trans_block_group(trans, inode);
1697 btrfs_update_inode(trans, root, inode);
1698 btrfs_end_transaction(trans, root);
1699 mutex_unlock(&root->fs_info->fs_mutex);
1702 static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1703 struct btrfs_root *root,
1704 const char *name, int name_len,
1707 struct btrfs_block_group_cache *group,
1710 struct inode *inode;
1711 struct btrfs_inode_item *inode_item;
1712 struct btrfs_block_group_cache *new_inode_group;
1713 struct btrfs_key *location;
1714 struct btrfs_path *path;
1715 struct btrfs_inode_ref *ref;
1716 struct btrfs_key key[2];
1722 path = btrfs_alloc_path();
1725 inode = new_inode(root->fs_info->sb);
1727 return ERR_PTR(-ENOMEM);
1729 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1730 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1731 inode->i_mapping, GFP_NOFS);
1732 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1733 inode->i_mapping, GFP_NOFS);
1734 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
1735 BTRFS_I(inode)->delalloc_bytes = 0;
1736 BTRFS_I(inode)->root = root;
1742 new_inode_group = btrfs_find_block_group(root, group, 0,
1743 BTRFS_BLOCK_GROUP_METADATA, owner);
1744 if (!new_inode_group) {
1745 printk("find_block group failed\n");
1746 new_inode_group = group;
1748 BTRFS_I(inode)->block_group = new_inode_group;
1749 BTRFS_I(inode)->flags = 0;
1751 key[0].objectid = objectid;
1752 btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY);
1755 key[1].objectid = objectid;
1756 btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY);
1757 key[1].offset = ref_objectid;
1759 sizes[0] = sizeof(struct btrfs_inode_item);
1760 sizes[1] = name_len + sizeof(*ref);
1762 ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2);
1766 if (objectid > root->highest_inode)
1767 root->highest_inode = objectid;
1769 inode->i_uid = current->fsuid;
1770 inode->i_gid = current->fsgid;
1771 inode->i_mode = mode;
1772 inode->i_ino = objectid;
1773 inode->i_blocks = 0;
1774 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1775 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
1776 struct btrfs_inode_item);
1777 fill_inode_item(path->nodes[0], inode_item, inode);
1779 ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1,
1780 struct btrfs_inode_ref);
1781 btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
1782 ptr = (unsigned long)(ref + 1);
1783 write_extent_buffer(path->nodes[0], name, ptr, name_len);
1785 btrfs_mark_buffer_dirty(path->nodes[0]);
1786 btrfs_free_path(path);
1788 location = &BTRFS_I(inode)->location;
1789 location->objectid = objectid;
1790 location->offset = 0;
1791 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1793 insert_inode_hash(inode);
1796 btrfs_free_path(path);
1797 return ERR_PTR(ret);
1800 static inline u8 btrfs_inode_type(struct inode *inode)
1802 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1805 static int btrfs_add_link(struct btrfs_trans_handle *trans,
1806 struct dentry *dentry, struct inode *inode,
1810 struct btrfs_key key;
1811 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
1812 struct inode *parent_inode;
1814 key.objectid = inode->i_ino;
1815 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1818 ret = btrfs_insert_dir_item(trans, root,
1819 dentry->d_name.name, dentry->d_name.len,
1820 dentry->d_parent->d_inode->i_ino,
1821 &key, btrfs_inode_type(inode));
1824 ret = btrfs_insert_inode_ref(trans, root,
1825 dentry->d_name.name,
1828 dentry->d_parent->d_inode->i_ino);
1830 parent_inode = dentry->d_parent->d_inode;
1831 parent_inode->i_size += dentry->d_name.len * 2;
1832 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
1833 ret = btrfs_update_inode(trans, root,
1834 dentry->d_parent->d_inode);
1839 static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1840 struct dentry *dentry, struct inode *inode,
1843 int err = btrfs_add_link(trans, dentry, inode, backref);
1845 d_instantiate(dentry, inode);
1853 static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1854 int mode, dev_t rdev)
1856 struct btrfs_trans_handle *trans;
1857 struct btrfs_root *root = BTRFS_I(dir)->root;
1858 struct inode *inode = NULL;
1862 unsigned long nr = 0;
1864 if (!new_valid_dev(rdev))
1867 mutex_lock(&root->fs_info->fs_mutex);
1868 err = btrfs_check_free_space(root, 1, 0);
1872 trans = btrfs_start_transaction(root, 1);
1873 btrfs_set_trans_block_group(trans, dir);
1875 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1881 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1883 dentry->d_parent->d_inode->i_ino, objectid,
1884 BTRFS_I(dir)->block_group, mode);
1885 err = PTR_ERR(inode);
1889 btrfs_set_trans_block_group(trans, inode);
1890 err = btrfs_add_nondir(trans, dentry, inode, 0);
1894 inode->i_op = &btrfs_special_inode_operations;
1895 init_special_inode(inode, inode->i_mode, rdev);
1896 btrfs_update_inode(trans, root, inode);
1898 dir->i_sb->s_dirt = 1;
1899 btrfs_update_inode_block_group(trans, inode);
1900 btrfs_update_inode_block_group(trans, dir);
1902 nr = trans->blocks_used;
1903 btrfs_end_transaction(trans, root);
1905 mutex_unlock(&root->fs_info->fs_mutex);
1908 inode_dec_link_count(inode);
1911 btrfs_btree_balance_dirty(root, nr);
1912 btrfs_throttle(root);
1916 static int btrfs_create(struct inode *dir, struct dentry *dentry,
1917 int mode, struct nameidata *nd)
1919 struct btrfs_trans_handle *trans;
1920 struct btrfs_root *root = BTRFS_I(dir)->root;
1921 struct inode *inode = NULL;
1924 unsigned long nr = 0;
1927 mutex_lock(&root->fs_info->fs_mutex);
1928 err = btrfs_check_free_space(root, 1, 0);
1931 trans = btrfs_start_transaction(root, 1);
1932 btrfs_set_trans_block_group(trans, dir);
1934 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1940 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
1942 dentry->d_parent->d_inode->i_ino,
1943 objectid, BTRFS_I(dir)->block_group, mode);
1944 err = PTR_ERR(inode);
1948 btrfs_set_trans_block_group(trans, inode);
1949 err = btrfs_add_nondir(trans, dentry, inode, 0);
1953 inode->i_mapping->a_ops = &btrfs_aops;
1954 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
1955 inode->i_fop = &btrfs_file_operations;
1956 inode->i_op = &btrfs_file_inode_operations;
1957 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
1958 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
1959 inode->i_mapping, GFP_NOFS);
1960 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
1961 inode->i_mapping, GFP_NOFS);
1962 BTRFS_I(inode)->delalloc_bytes = 0;
1963 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
1964 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
1966 dir->i_sb->s_dirt = 1;
1967 btrfs_update_inode_block_group(trans, inode);
1968 btrfs_update_inode_block_group(trans, dir);
1970 nr = trans->blocks_used;
1971 btrfs_end_transaction(trans, root);
1973 mutex_unlock(&root->fs_info->fs_mutex);
1976 inode_dec_link_count(inode);
1979 btrfs_btree_balance_dirty(root, nr);
1980 btrfs_throttle(root);
1984 static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1985 struct dentry *dentry)
1987 struct btrfs_trans_handle *trans;
1988 struct btrfs_root *root = BTRFS_I(dir)->root;
1989 struct inode *inode = old_dentry->d_inode;
1990 unsigned long nr = 0;
1994 if (inode->i_nlink == 0)
1997 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
2002 mutex_lock(&root->fs_info->fs_mutex);
2003 err = btrfs_check_free_space(root, 1, 0);
2006 trans = btrfs_start_transaction(root, 1);
2008 btrfs_set_trans_block_group(trans, dir);
2009 atomic_inc(&inode->i_count);
2010 err = btrfs_add_nondir(trans, dentry, inode, 1);
2015 dir->i_sb->s_dirt = 1;
2016 btrfs_update_inode_block_group(trans, dir);
2017 err = btrfs_update_inode(trans, root, inode);
2022 nr = trans->blocks_used;
2023 btrfs_end_transaction(trans, root);
2025 mutex_unlock(&root->fs_info->fs_mutex);
2028 inode_dec_link_count(inode);
2031 btrfs_btree_balance_dirty(root, nr);
2032 btrfs_throttle(root);
2036 static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
2038 struct inode *inode = NULL;
2039 struct btrfs_trans_handle *trans;
2040 struct btrfs_root *root = BTRFS_I(dir)->root;
2042 int drop_on_err = 0;
2044 unsigned long nr = 1;
2046 mutex_lock(&root->fs_info->fs_mutex);
2047 err = btrfs_check_free_space(root, 1, 0);
2051 trans = btrfs_start_transaction(root, 1);
2052 btrfs_set_trans_block_group(trans, dir);
2054 if (IS_ERR(trans)) {
2055 err = PTR_ERR(trans);
2059 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2065 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
2067 dentry->d_parent->d_inode->i_ino, objectid,
2068 BTRFS_I(dir)->block_group, S_IFDIR | mode);
2069 if (IS_ERR(inode)) {
2070 err = PTR_ERR(inode);
2075 inode->i_op = &btrfs_dir_inode_operations;
2076 inode->i_fop = &btrfs_dir_file_operations;
2077 btrfs_set_trans_block_group(trans, inode);
2080 err = btrfs_update_inode(trans, root, inode);
2084 err = btrfs_add_link(trans, dentry, inode, 0);
2088 d_instantiate(dentry, inode);
2090 dir->i_sb->s_dirt = 1;
2091 btrfs_update_inode_block_group(trans, inode);
2092 btrfs_update_inode_block_group(trans, dir);
2095 nr = trans->blocks_used;
2096 btrfs_end_transaction(trans, root);
2099 mutex_unlock(&root->fs_info->fs_mutex);
2102 btrfs_btree_balance_dirty(root, nr);
2103 btrfs_throttle(root);
2107 static int merge_extent_mapping(struct extent_map_tree *em_tree,
2108 struct extent_map *existing,
2109 struct extent_map *em)
2114 int real_blocks = existing->block_start < EXTENT_MAP_LAST_BYTE;
2116 if (real_blocks && em->block_start >= EXTENT_MAP_LAST_BYTE)
2119 if (!real_blocks && em->block_start != existing->block_start)
2122 new_end = max(existing->start + existing->len, em->start + em->len);
2124 if (existing->start >= em->start) {
2125 if (em->start + em->len < existing->start)
2128 start_diff = existing->start - em->start;
2129 if (real_blocks && em->block_start + start_diff !=
2130 existing->block_start)
2133 em->len = new_end - em->start;
2135 remove_extent_mapping(em_tree, existing);
2136 /* free for the tree */
2137 free_extent_map(existing);
2138 ret = add_extent_mapping(em_tree, em);
2140 } else if (em->start > existing->start) {
2142 if (existing->start + existing->len < em->start)
2145 start_diff = em->start - existing->start;
2146 if (real_blocks && existing->block_start + start_diff !=
2150 remove_extent_mapping(em_tree, existing);
2151 em->block_start = existing->block_start;
2152 em->start = existing->start;
2153 em->len = new_end - existing->start;
2154 free_extent_map(existing);
2156 ret = add_extent_mapping(em_tree, em);
2163 printk("invalid extent map merge [%Lu %Lu %Lu] [%Lu %Lu %Lu]\n",
2164 existing->start, existing->len, existing->block_start,
2165 em->start, em->len, em->block_start);
2169 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
2170 size_t pg_offset, u64 start, u64 len,
2176 u64 extent_start = 0;
2178 u64 objectid = inode->i_ino;
2180 struct btrfs_path *path;
2181 struct btrfs_root *root = BTRFS_I(inode)->root;
2182 struct btrfs_file_extent_item *item;
2183 struct extent_buffer *leaf;
2184 struct btrfs_key found_key;
2185 struct extent_map *em = NULL;
2186 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
2187 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2188 struct btrfs_trans_handle *trans = NULL;
2190 path = btrfs_alloc_path();
2192 mutex_lock(&root->fs_info->fs_mutex);
2195 spin_lock(&em_tree->lock);
2196 em = lookup_extent_mapping(em_tree, start, len);
2197 spin_unlock(&em_tree->lock);
2200 if (em->start > start || em->start + em->len <= start)
2201 free_extent_map(em);
2202 else if (em->block_start == EXTENT_MAP_INLINE && page)
2203 free_extent_map(em);
2207 em = alloc_extent_map(GFP_NOFS);
2213 em->start = EXTENT_MAP_HOLE;
2215 em->bdev = inode->i_sb->s_bdev;
2216 ret = btrfs_lookup_file_extent(trans, root, path,
2217 objectid, start, trans != NULL);
2224 if (path->slots[0] == 0)
2229 leaf = path->nodes[0];
2230 item = btrfs_item_ptr(leaf, path->slots[0],
2231 struct btrfs_file_extent_item);
2232 /* are we inside the extent that was found? */
2233 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
2234 found_type = btrfs_key_type(&found_key);
2235 if (found_key.objectid != objectid ||
2236 found_type != BTRFS_EXTENT_DATA_KEY) {
2240 found_type = btrfs_file_extent_type(leaf, item);
2241 extent_start = found_key.offset;
2242 if (found_type == BTRFS_FILE_EXTENT_REG) {
2243 extent_end = extent_start +
2244 btrfs_file_extent_num_bytes(leaf, item);
2246 if (start < extent_start || start >= extent_end) {
2248 if (start < extent_start) {
2249 if (start + len <= extent_start)
2251 em->len = extent_end - extent_start;
2257 bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
2259 em->start = extent_start;
2260 em->len = extent_end - extent_start;
2261 em->block_start = EXTENT_MAP_HOLE;
2264 bytenr += btrfs_file_extent_offset(leaf, item);
2265 em->block_start = bytenr;
2266 em->start = extent_start;
2267 em->len = extent_end - extent_start;
2269 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
2274 size_t extent_offset;
2277 size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
2279 extent_end = (extent_start + size + root->sectorsize - 1) &
2280 ~((u64)root->sectorsize - 1);
2281 if (start < extent_start || start >= extent_end) {
2283 if (start < extent_start) {
2284 if (start + len <= extent_start)
2286 em->len = extent_end - extent_start;
2292 em->block_start = EXTENT_MAP_INLINE;
2295 em->start = extent_start;
2300 page_start = page_offset(page) + pg_offset;
2301 extent_offset = page_start - extent_start;
2302 copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset,
2303 size - extent_offset);
2304 em->start = extent_start + extent_offset;
2305 em->len = (copy_size + root->sectorsize - 1) &
2306 ~((u64)root->sectorsize - 1);
2308 ptr = btrfs_file_extent_inline_start(item) + extent_offset;
2309 if (create == 0 && !PageUptodate(page)) {
2310 read_extent_buffer(leaf, map + pg_offset, ptr,
2312 flush_dcache_page(page);
2313 } else if (create && PageUptodate(page)) {
2316 free_extent_map(em);
2318 btrfs_release_path(root, path);
2319 trans = btrfs_start_transaction(root, 1);
2322 write_extent_buffer(leaf, map + pg_offset, ptr,
2324 btrfs_mark_buffer_dirty(leaf);
2327 set_extent_uptodate(io_tree, em->start,
2328 extent_map_end(em) - 1, GFP_NOFS);
2331 printk("unkknown found_type %d\n", found_type);
2338 em->block_start = EXTENT_MAP_HOLE;
2340 btrfs_release_path(root, path);
2341 if (em->start > start || extent_map_end(em) <= start) {
2342 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
2348 spin_lock(&em_tree->lock);
2349 ret = add_extent_mapping(em_tree, em);
2350 /* it is possible that someone inserted the extent into the tree
2351 * while we had the lock dropped. It is also possible that
2352 * an overlapping map exists in the tree
2354 if (ret == -EEXIST) {
2355 struct extent_map *existing;
2356 existing = lookup_extent_mapping(em_tree, start, len);
2357 if (existing && (existing->start > start ||
2358 existing->start + existing->len <= start)) {
2359 free_extent_map(existing);
2363 existing = lookup_extent_mapping(em_tree, em->start,
2366 err = merge_extent_mapping(em_tree, existing,
2368 free_extent_map(existing);
2370 free_extent_map(em);
2375 printk("failing to insert %Lu %Lu\n",
2377 free_extent_map(em);
2381 free_extent_map(em);
2385 spin_unlock(&em_tree->lock);
2387 btrfs_free_path(path);
2389 ret = btrfs_end_transaction(trans, root);
2393 mutex_unlock(&root->fs_info->fs_mutex);
2395 free_extent_map(em);
2397 return ERR_PTR(err);
2402 #if 0 /* waiting for O_DIRECT reads */
2403 static int btrfs_get_block(struct inode *inode, sector_t iblock,
2404 struct buffer_head *bh_result, int create)
2406 struct extent_map *em;
2407 u64 start = (u64)iblock << inode->i_blkbits;
2408 struct btrfs_multi_bio *multi = NULL;
2409 struct btrfs_root *root = BTRFS_I(inode)->root;
2415 em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0);
2417 if (!em || IS_ERR(em))
2420 if (em->start > start || em->start + em->len <= start) {
2424 if (em->block_start == EXTENT_MAP_INLINE) {
2429 len = em->start + em->len - start;
2430 len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size)));
2432 if (em->block_start == EXTENT_MAP_HOLE ||
2433 em->block_start == EXTENT_MAP_DELALLOC) {
2434 bh_result->b_size = len;
2438 logical = start - em->start;
2439 logical = em->block_start + logical;
2442 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
2443 logical, &map_length, &multi, 0);
2445 bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits;
2446 bh_result->b_size = min(map_length, len);
2448 bh_result->b_bdev = multi->stripes[0].dev->bdev;
2449 set_buffer_mapped(bh_result);
2452 free_extent_map(em);
2457 static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb,
2458 const struct iovec *iov, loff_t offset,
2459 unsigned long nr_segs)
2463 struct file *file = iocb->ki_filp;
2464 struct inode *inode = file->f_mapping->host;
2469 return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
2470 offset, nr_segs, btrfs_get_block, NULL);
2474 static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
2476 return extent_bmap(mapping, iblock, btrfs_get_extent);
2479 int btrfs_readpage(struct file *file, struct page *page)
2481 struct extent_io_tree *tree;
2482 tree = &BTRFS_I(page->mapping->host)->io_tree;
2483 return extent_read_full_page(tree, page, btrfs_get_extent);
2486 static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
2488 struct extent_io_tree *tree;
2491 if (current->flags & PF_MEMALLOC) {
2492 redirty_page_for_writepage(wbc, page);
2496 tree = &BTRFS_I(page->mapping->host)->io_tree;
2497 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
2500 static int btrfs_writepages(struct address_space *mapping,
2501 struct writeback_control *wbc)
2503 struct extent_io_tree *tree;
2504 tree = &BTRFS_I(mapping->host)->io_tree;
2505 return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
2509 btrfs_readpages(struct file *file, struct address_space *mapping,
2510 struct list_head *pages, unsigned nr_pages)
2512 struct extent_io_tree *tree;
2513 tree = &BTRFS_I(mapping->host)->io_tree;
2514 return extent_readpages(tree, mapping, pages, nr_pages,
2518 static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
2520 struct extent_io_tree *tree;
2521 struct extent_map_tree *map;
2524 tree = &BTRFS_I(page->mapping->host)->io_tree;
2525 map = &BTRFS_I(page->mapping->host)->extent_tree;
2526 ret = try_release_extent_mapping(map, tree, page, gfp_flags);
2528 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
2529 ClearPagePrivate(page);
2530 set_page_private(page, 0);
2531 page_cache_release(page);
2536 static void btrfs_invalidatepage(struct page *page, unsigned long offset)
2538 struct extent_io_tree *tree;
2540 tree = &BTRFS_I(page->mapping->host)->io_tree;
2541 extent_invalidatepage(tree, page, offset);
2542 btrfs_releasepage(page, GFP_NOFS);
2543 if (PagePrivate(page)) {
2544 invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
2545 ClearPagePrivate(page);
2546 set_page_private(page, 0);
2547 page_cache_release(page);
2552 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2553 * called from a page fault handler when a page is first dirtied. Hence we must
2554 * be careful to check for EOF conditions here. We set the page up correctly
2555 * for a written page which means we get ENOSPC checking when writing into
2556 * holes and correct delalloc and unwritten extent mapping on filesystems that
2557 * support these features.
2559 * We are not allowed to take the i_mutex here so we have to play games to
2560 * protect against truncate races as the page could now be beyond EOF. Because
2561 * vmtruncate() writes the inode size before removing pages, once we have the
2562 * page lock we can determine safely if the page is beyond EOF. If it is not
2563 * beyond EOF, then the page is guaranteed safe against truncation until we
2566 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
2568 struct inode *inode = fdentry(vma->vm_file)->d_inode;
2569 struct btrfs_root *root = BTRFS_I(inode)->root;
2575 mutex_lock(&root->fs_info->fs_mutex);
2576 ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
2577 mutex_unlock(&root->fs_info->fs_mutex);
2584 wait_on_page_writeback(page);
2585 size = i_size_read(inode);
2586 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2588 if ((page->mapping != inode->i_mapping) ||
2589 (page_start > size)) {
2590 /* page got truncated out from underneath us */
2594 /* page is wholly or partially inside EOF */
2595 if (page_start + PAGE_CACHE_SIZE > size)
2596 end = size & ~PAGE_CACHE_MASK;
2598 end = PAGE_CACHE_SIZE;
2600 ret = btrfs_cow_one_page(inode, page, end);
2608 static void btrfs_truncate(struct inode *inode)
2610 struct btrfs_root *root = BTRFS_I(inode)->root;
2612 struct btrfs_trans_handle *trans;
2615 if (!S_ISREG(inode->i_mode))
2617 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
2620 btrfs_truncate_page(inode->i_mapping, inode->i_size);
2622 mutex_lock(&root->fs_info->fs_mutex);
2623 trans = btrfs_start_transaction(root, 1);
2624 btrfs_set_trans_block_group(trans, inode);
2626 /* FIXME, add redo link to tree so we don't leak on crash */
2627 ret = btrfs_truncate_in_trans(trans, root, inode,
2628 BTRFS_EXTENT_DATA_KEY);
2629 btrfs_update_inode(trans, root, inode);
2630 nr = trans->blocks_used;
2632 ret = btrfs_end_transaction(trans, root);
2634 mutex_unlock(&root->fs_info->fs_mutex);
2635 btrfs_btree_balance_dirty(root, nr);
2636 btrfs_throttle(root);
2639 static int noinline create_subvol(struct btrfs_root *root, char *name,
2642 struct btrfs_trans_handle *trans;
2643 struct btrfs_key key;
2644 struct btrfs_root_item root_item;
2645 struct btrfs_inode_item *inode_item;
2646 struct extent_buffer *leaf;
2647 struct btrfs_root *new_root = root;
2648 struct inode *inode;
2653 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
2654 unsigned long nr = 1;
2656 mutex_lock(&root->fs_info->fs_mutex);
2657 ret = btrfs_check_free_space(root, 1, 0);
2661 trans = btrfs_start_transaction(root, 1);
2664 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2669 leaf = __btrfs_alloc_free_block(trans, root, root->leafsize,
2670 objectid, trans->transid, 0, 0,
2673 return PTR_ERR(leaf);
2675 btrfs_set_header_nritems(leaf, 0);
2676 btrfs_set_header_level(leaf, 0);
2677 btrfs_set_header_bytenr(leaf, leaf->start);
2678 btrfs_set_header_generation(leaf, trans->transid);
2679 btrfs_set_header_owner(leaf, objectid);
2681 write_extent_buffer(leaf, root->fs_info->fsid,
2682 (unsigned long)btrfs_header_fsid(leaf),
2684 btrfs_mark_buffer_dirty(leaf);
2686 inode_item = &root_item.inode;
2687 memset(inode_item, 0, sizeof(*inode_item));
2688 inode_item->generation = cpu_to_le64(1);
2689 inode_item->size = cpu_to_le64(3);
2690 inode_item->nlink = cpu_to_le32(1);
2691 inode_item->nblocks = cpu_to_le64(1);
2692 inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
2694 btrfs_set_root_bytenr(&root_item, leaf->start);
2695 btrfs_set_root_level(&root_item, 0);
2696 btrfs_set_root_refs(&root_item, 1);
2697 btrfs_set_root_used(&root_item, 0);
2699 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2700 root_item.drop_level = 0;
2702 free_extent_buffer(leaf);
2705 btrfs_set_root_dirid(&root_item, new_dirid);
2707 key.objectid = objectid;
2709 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2710 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2716 * insert the directory item
2718 key.offset = (u64)-1;
2719 dir = root->fs_info->sb->s_root->d_inode;
2720 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2721 name, namelen, dir->i_ino, &key,
2726 ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
2727 name, namelen, objectid,
2728 root->fs_info->sb->s_root->d_inode->i_ino);
2732 ret = btrfs_commit_transaction(trans, root);
2736 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
2739 trans = btrfs_start_transaction(new_root, 1);
2742 inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid,
2744 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
2747 inode->i_op = &btrfs_dir_inode_operations;
2748 inode->i_fop = &btrfs_dir_file_operations;
2749 new_root->inode = inode;
2751 ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
2755 ret = btrfs_update_inode(trans, new_root, inode);
2759 nr = trans->blocks_used;
2760 err = btrfs_commit_transaction(trans, new_root);
2764 mutex_unlock(&root->fs_info->fs_mutex);
2765 btrfs_btree_balance_dirty(root, nr);
2766 btrfs_throttle(root);
2770 static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2772 struct btrfs_pending_snapshot *pending_snapshot;
2773 struct btrfs_trans_handle *trans;
2776 unsigned long nr = 0;
2778 if (!root->ref_cows)
2781 mutex_lock(&root->fs_info->fs_mutex);
2782 ret = btrfs_check_free_space(root, 1, 0);
2786 pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS);
2787 if (!pending_snapshot) {
2791 pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
2792 if (!pending_snapshot->name) {
2794 kfree(pending_snapshot);
2797 memcpy(pending_snapshot->name, name, namelen);
2798 pending_snapshot->name[namelen] = '\0';
2799 trans = btrfs_start_transaction(root, 1);
2801 pending_snapshot->root = root;
2802 list_add(&pending_snapshot->list,
2803 &trans->transaction->pending_snapshots);
2804 ret = btrfs_update_inode(trans, root, root->inode);
2805 err = btrfs_commit_transaction(trans, root);
2808 mutex_unlock(&root->fs_info->fs_mutex);
2809 btrfs_btree_balance_dirty(root, nr);
2810 btrfs_throttle(root);
2814 unsigned long btrfs_force_ra(struct address_space *mapping,
2815 struct file_ra_state *ra, struct file *file,
2816 pgoff_t offset, pgoff_t last_index)
2818 pgoff_t req_size = last_index - offset + 1;
2820 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2821 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
2824 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
2825 return offset + req_size;
2829 int btrfs_defrag_file(struct file *file) {
2830 struct inode *inode = fdentry(file)->d_inode;
2831 struct btrfs_root *root = BTRFS_I(inode)->root;
2832 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
2834 unsigned long last_index;
2835 unsigned long ra_pages = root->fs_info->bdi.ra_pages;
2836 unsigned long total_read = 0;
2842 mutex_lock(&root->fs_info->fs_mutex);
2843 ret = btrfs_check_free_space(root, inode->i_size, 0);
2844 mutex_unlock(&root->fs_info->fs_mutex);
2848 mutex_lock(&inode->i_mutex);
2849 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
2850 for (i = 0; i <= last_index; i++) {
2851 if (total_read % ra_pages == 0) {
2852 btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i,
2853 min(last_index, i + ra_pages - 1));
2856 page = grab_cache_page(inode->i_mapping, i);
2859 if (!PageUptodate(page)) {
2860 btrfs_readpage(NULL, page);
2862 if (!PageUptodate(page)) {
2864 page_cache_release(page);
2869 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
2870 ClearPageDirty(page);
2872 cancel_dirty_page(page, PAGE_CACHE_SIZE);
2874 wait_on_page_writeback(page);
2875 set_page_extent_mapped(page);
2877 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
2878 page_end = page_start + PAGE_CACHE_SIZE - 1;
2880 lock_extent(io_tree, page_start, page_end, GFP_NOFS);
2881 set_extent_delalloc(io_tree, page_start,
2882 page_end, GFP_NOFS);
2884 unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
2885 set_page_dirty(page);
2887 page_cache_release(page);
2888 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
2892 mutex_unlock(&inode->i_mutex);
2896 static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg)
2901 struct btrfs_ioctl_vol_args *vol_args;
2902 struct btrfs_trans_handle *trans;
2903 struct btrfs_device *device = NULL;
2905 char *devstr = NULL;
2910 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
2915 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
2919 namelen = strlen(vol_args->name);
2920 if (namelen > BTRFS_VOL_NAME_MAX) {
2925 mutex_lock(&root->fs_info->fs_mutex);
2926 sizestr = vol_args->name;
2927 devstr = strchr(sizestr, ':');
2930 sizestr = devstr + 1;
2932 devstr = vol_args->name;
2933 devid = simple_strtoull(devstr, &end, 10);
2934 printk("resizing devid %Lu\n", devid);
2936 device = btrfs_find_device(root, devid, NULL);
2938 printk("resizer unable to find device %Lu\n", devid);
2942 if (!strcmp(sizestr, "max"))
2943 new_size = device->bdev->bd_inode->i_size;
2945 if (sizestr[0] == '-') {
2948 } else if (sizestr[0] == '+') {
2952 new_size = btrfs_parse_size(sizestr);
2953 if (new_size == 0) {
2959 old_size = device->total_bytes;
2962 if (new_size > old_size) {
2966 new_size = old_size - new_size;
2967 } else if (mod > 0) {
2968 new_size = old_size + new_size;
2971 if (new_size < 256 * 1024 * 1024) {
2975 if (new_size > device->bdev->bd_inode->i_size) {
2980 do_div(new_size, root->sectorsize);
2981 new_size *= root->sectorsize;
2983 printk("new size for %s is %llu\n", device->name, (unsigned long long)new_size);
2985 if (new_size > old_size) {
2986 trans = btrfs_start_transaction(root, 1);
2987 ret = btrfs_grow_device(trans, device, new_size);
2988 btrfs_commit_transaction(trans, root);
2990 ret = btrfs_shrink_device(device, new_size);
2994 mutex_unlock(&root->fs_info->fs_mutex);
3000 static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root,
3003 struct btrfs_ioctl_vol_args *vol_args;
3004 struct btrfs_dir_item *di;
3005 struct btrfs_path *path;
3010 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
3015 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3020 namelen = strlen(vol_args->name);
3021 if (namelen > BTRFS_VOL_NAME_MAX) {
3025 if (strchr(vol_args->name, '/')) {
3030 path = btrfs_alloc_path();
3036 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
3037 mutex_lock(&root->fs_info->fs_mutex);
3038 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
3040 vol_args->name, namelen, 0);
3041 mutex_unlock(&root->fs_info->fs_mutex);
3042 btrfs_free_path(path);
3044 if (di && !IS_ERR(di)) {
3054 if (root == root->fs_info->tree_root)
3055 ret = create_subvol(root, vol_args->name, namelen);
3057 ret = create_snapshot(root, vol_args->name, namelen);
3063 static int btrfs_ioctl_defrag(struct file *file)
3065 struct inode *inode = fdentry(file)->d_inode;
3066 struct btrfs_root *root = BTRFS_I(inode)->root;
3068 switch (inode->i_mode & S_IFMT) {
3070 mutex_lock(&root->fs_info->fs_mutex);
3071 btrfs_defrag_root(root, 0);
3072 btrfs_defrag_root(root->fs_info->extent_root, 0);
3073 mutex_unlock(&root->fs_info->fs_mutex);
3076 btrfs_defrag_file(file);
3083 long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg)
3085 struct btrfs_ioctl_vol_args *vol_args;
3088 vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS);
3093 if (copy_from_user(vol_args, arg, sizeof(*vol_args))) {
3097 ret = btrfs_init_new_device(root, vol_args->name);
3104 int dup_item_to_inode(struct btrfs_trans_handle *trans,
3105 struct btrfs_root *root,
3106 struct btrfs_path *path,
3107 struct extent_buffer *leaf,
3109 struct btrfs_key *key,
3113 int len = btrfs_item_size_nr(leaf, slot);
3114 struct btrfs_key ckey = *key;
3117 dup = kmalloc(len, GFP_NOFS);
3121 read_extent_buffer(leaf, dup, btrfs_item_ptr_offset(leaf, slot), len);
3122 btrfs_release_path(root, path);
3124 ckey.objectid = destino;
3125 ret = btrfs_insert_item(trans, root, &ckey, dup, len);
3130 long btrfs_ioctl_clone(struct file *file, unsigned long src_fd)
3132 struct inode *inode = fdentry(file)->d_inode;
3133 struct btrfs_root *root = BTRFS_I(inode)->root;
3134 struct file *src_file;
3136 struct btrfs_trans_handle *trans;
3139 struct btrfs_path *path;
3140 struct btrfs_key key;
3141 struct extent_buffer *leaf;
3145 src_file = fget(src_fd);
3148 src = src_file->f_dentry->d_inode;
3151 if (src->i_sb != inode->i_sb)
3155 mutex_lock(&inode->i_mutex);
3156 mutex_lock(&src->i_mutex);
3158 mutex_lock(&src->i_mutex);
3159 mutex_lock(&inode->i_mutex);
3166 /* do any pending delalloc/csum calc on src, one way or
3167 another, and lock file content */
3169 filemap_write_and_wait(src->i_mapping);
3170 lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
3171 if (BTRFS_I(src)->delalloc_bytes == 0)
3173 unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
3176 mutex_lock(&root->fs_info->fs_mutex);
3177 trans = btrfs_start_transaction(root, 0);
3178 path = btrfs_alloc_path();
3184 key.type = BTRFS_EXTENT_DATA_KEY;
3185 key.objectid = src->i_ino;
3191 * note the key will change type as we walk through the
3194 ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
3198 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
3199 ret = btrfs_next_leaf(root, path);
3205 leaf = path->nodes[0];
3206 slot = path->slots[0];
3207 btrfs_item_key_to_cpu(leaf, &key, slot);
3208 nritems = btrfs_header_nritems(leaf);
3210 if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY ||
3211 key.objectid != src->i_ino)
3214 if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
3215 struct btrfs_file_extent_item *extent;
3218 extent = btrfs_item_ptr(leaf, slot,
3219 struct btrfs_file_extent_item);
3220 found_type = btrfs_file_extent_type(leaf, extent);
3221 if (found_type == BTRFS_FILE_EXTENT_REG) {
3222 u64 len = btrfs_file_extent_num_bytes(leaf,
3224 u64 ds = btrfs_file_extent_disk_bytenr(leaf,
3226 u64 dl = btrfs_file_extent_disk_num_bytes(leaf,
3228 u64 off = btrfs_file_extent_offset(leaf,
3230 btrfs_insert_file_extent(trans, root,
3233 /* ds == 0 means there's a hole */
3235 btrfs_inc_extent_ref(trans, root,
3237 root->root_key.objectid,
3241 pos = key.offset + len;
3242 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
3243 ret = dup_item_to_inode(trans, root, path,
3248 pos = key.offset + btrfs_item_size_nr(leaf,
3251 } else if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) {
3252 ret = dup_item_to_inode(trans, root, path, leaf,
3253 slot, &key, inode->i_ino);
3259 btrfs_release_path(root, path);
3264 btrfs_free_path(path);
3266 inode->i_blocks = src->i_blocks;
3267 i_size_write(inode, src->i_size);
3268 btrfs_update_inode(trans, root, inode);
3270 unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS);
3272 btrfs_end_transaction(trans, root);
3273 mutex_unlock(&root->fs_info->fs_mutex);
3276 mutex_unlock(&src->i_mutex);
3277 mutex_unlock(&inode->i_mutex);
3283 long btrfs_ioctl(struct file *file, unsigned int
3284 cmd, unsigned long arg)
3286 struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
3289 case BTRFS_IOC_SNAP_CREATE:
3290 return btrfs_ioctl_snap_create(root, (void __user *)arg);
3291 case BTRFS_IOC_DEFRAG:
3292 return btrfs_ioctl_defrag(file);
3293 case BTRFS_IOC_RESIZE:
3294 return btrfs_ioctl_resize(root, (void __user *)arg);
3295 case BTRFS_IOC_ADD_DEV:
3296 return btrfs_ioctl_add_dev(root, (void __user *)arg);
3297 case BTRFS_IOC_BALANCE:
3298 return btrfs_balance(root->fs_info->dev_root);
3299 case BTRFS_IOC_CLONE:
3300 return btrfs_ioctl_clone(file, arg);
3307 * Called inside transaction, so use GFP_NOFS
3309 struct inode *btrfs_alloc_inode(struct super_block *sb)
3311 struct btrfs_inode *ei;
3313 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
3317 ei->ordered_trans = 0;
3318 return &ei->vfs_inode;
3321 void btrfs_destroy_inode(struct inode *inode)
3323 WARN_ON(!list_empty(&inode->i_dentry));
3324 WARN_ON(inode->i_data.nrpages);
3326 btrfs_drop_extent_cache(inode, 0, (u64)-1);
3327 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
3330 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3331 static void init_once(struct kmem_cache * cachep, void *foo)
3333 static void init_once(void * foo, struct kmem_cache * cachep,
3334 unsigned long flags)
3337 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
3339 inode_init_once(&ei->vfs_inode);
3342 void btrfs_destroy_cachep(void)
3344 if (btrfs_inode_cachep)
3345 kmem_cache_destroy(btrfs_inode_cachep);
3346 if (btrfs_trans_handle_cachep)
3347 kmem_cache_destroy(btrfs_trans_handle_cachep);
3348 if (btrfs_transaction_cachep)
3349 kmem_cache_destroy(btrfs_transaction_cachep);
3350 if (btrfs_bit_radix_cachep)
3351 kmem_cache_destroy(btrfs_bit_radix_cachep);
3352 if (btrfs_path_cachep)
3353 kmem_cache_destroy(btrfs_path_cachep);
3356 struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
3357 unsigned long extra_flags,
3358 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3359 void (*ctor)(struct kmem_cache *, void *)
3361 void (*ctor)(void *, struct kmem_cache *,
3366 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
3367 SLAB_MEM_SPREAD | extra_flags), ctor
3368 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
3374 int btrfs_init_cachep(void)
3376 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
3377 sizeof(struct btrfs_inode),
3379 if (!btrfs_inode_cachep)
3381 btrfs_trans_handle_cachep =
3382 btrfs_cache_create("btrfs_trans_handle_cache",
3383 sizeof(struct btrfs_trans_handle),
3385 if (!btrfs_trans_handle_cachep)
3387 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
3388 sizeof(struct btrfs_transaction),
3390 if (!btrfs_transaction_cachep)
3392 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
3393 sizeof(struct btrfs_path),
3395 if (!btrfs_path_cachep)
3397 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
3398 SLAB_DESTROY_BY_RCU, NULL);
3399 if (!btrfs_bit_radix_cachep)
3403 btrfs_destroy_cachep();
3407 static int btrfs_getattr(struct vfsmount *mnt,
3408 struct dentry *dentry, struct kstat *stat)
3410 struct inode *inode = dentry->d_inode;
3411 generic_fillattr(inode, stat);
3412 stat->blksize = PAGE_CACHE_SIZE;
3413 stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9);
3417 static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
3418 struct inode * new_dir,struct dentry *new_dentry)
3420 struct btrfs_trans_handle *trans;
3421 struct btrfs_root *root = BTRFS_I(old_dir)->root;
3422 struct inode *new_inode = new_dentry->d_inode;
3423 struct inode *old_inode = old_dentry->d_inode;
3424 struct timespec ctime = CURRENT_TIME;
3425 struct btrfs_path *path;
3428 if (S_ISDIR(old_inode->i_mode) && new_inode &&
3429 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
3433 mutex_lock(&root->fs_info->fs_mutex);
3434 ret = btrfs_check_free_space(root, 1, 0);
3438 trans = btrfs_start_transaction(root, 1);
3440 btrfs_set_trans_block_group(trans, new_dir);
3441 path = btrfs_alloc_path();
3447 old_dentry->d_inode->i_nlink++;
3448 old_dir->i_ctime = old_dir->i_mtime = ctime;
3449 new_dir->i_ctime = new_dir->i_mtime = ctime;
3450 old_inode->i_ctime = ctime;
3452 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
3457 new_inode->i_ctime = CURRENT_TIME;
3458 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
3462 ret = btrfs_add_link(trans, new_dentry, old_inode, 1);
3467 btrfs_free_path(path);
3468 btrfs_end_transaction(trans, root);
3470 mutex_unlock(&root->fs_info->fs_mutex);
3474 static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
3475 const char *symname)
3477 struct btrfs_trans_handle *trans;
3478 struct btrfs_root *root = BTRFS_I(dir)->root;
3479 struct btrfs_path *path;
3480 struct btrfs_key key;
3481 struct inode *inode = NULL;
3488 struct btrfs_file_extent_item *ei;
3489 struct extent_buffer *leaf;
3490 unsigned long nr = 0;
3492 name_len = strlen(symname) + 1;
3493 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
3494 return -ENAMETOOLONG;
3496 mutex_lock(&root->fs_info->fs_mutex);
3497 err = btrfs_check_free_space(root, 1, 0);
3501 trans = btrfs_start_transaction(root, 1);
3502 btrfs_set_trans_block_group(trans, dir);
3504 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
3510 inode = btrfs_new_inode(trans, root, dentry->d_name.name,
3512 dentry->d_parent->d_inode->i_ino, objectid,
3513 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
3514 err = PTR_ERR(inode);
3518 btrfs_set_trans_block_group(trans, inode);
3519 err = btrfs_add_nondir(trans, dentry, inode, 0);
3523 inode->i_mapping->a_ops = &btrfs_aops;
3524 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
3525 inode->i_fop = &btrfs_file_operations;
3526 inode->i_op = &btrfs_file_inode_operations;
3527 extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
3528 extent_io_tree_init(&BTRFS_I(inode)->io_tree,
3529 inode->i_mapping, GFP_NOFS);
3530 extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree,
3531 inode->i_mapping, GFP_NOFS);
3532 BTRFS_I(inode)->delalloc_bytes = 0;
3533 atomic_set(&BTRFS_I(inode)->ordered_writeback, 0);
3534 BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
3536 dir->i_sb->s_dirt = 1;
3537 btrfs_update_inode_block_group(trans, inode);
3538 btrfs_update_inode_block_group(trans, dir);
3542 path = btrfs_alloc_path();
3544 key.objectid = inode->i_ino;
3546 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
3547 datasize = btrfs_file_extent_calc_inline_size(name_len);
3548 err = btrfs_insert_empty_item(trans, root, path, &key,
3554 leaf = path->nodes[0];
3555 ei = btrfs_item_ptr(leaf, path->slots[0],
3556 struct btrfs_file_extent_item);
3557 btrfs_set_file_extent_generation(leaf, ei, trans->transid);
3558 btrfs_set_file_extent_type(leaf, ei,
3559 BTRFS_FILE_EXTENT_INLINE);
3560 ptr = btrfs_file_extent_inline_start(ei);
3561 write_extent_buffer(leaf, symname, ptr, name_len);
3562 btrfs_mark_buffer_dirty(leaf);
3563 btrfs_free_path(path);
3565 inode->i_op = &btrfs_symlink_inode_operations;
3566 inode->i_mapping->a_ops = &btrfs_symlink_aops;
3567 inode->i_mapping->backing_dev_info = &root->fs_info->bdi;
3568 inode->i_size = name_len - 1;
3569 err = btrfs_update_inode(trans, root, inode);
3574 nr = trans->blocks_used;
3575 btrfs_end_transaction(trans, root);
3577 mutex_unlock(&root->fs_info->fs_mutex);
3579 inode_dec_link_count(inode);
3582 btrfs_btree_balance_dirty(root, nr);
3583 btrfs_throttle(root);
3587 static int btrfs_permission(struct inode *inode, int mask,
3588 struct nameidata *nd)
3590 if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE))
3592 return generic_permission(inode, mask, NULL);
3595 static struct inode_operations btrfs_dir_inode_operations = {
3596 .lookup = btrfs_lookup,
3597 .create = btrfs_create,
3598 .unlink = btrfs_unlink,
3600 .mkdir = btrfs_mkdir,
3601 .rmdir = btrfs_rmdir,
3602 .rename = btrfs_rename,
3603 .symlink = btrfs_symlink,
3604 .setattr = btrfs_setattr,
3605 .mknod = btrfs_mknod,
3606 .setxattr = generic_setxattr,
3607 .getxattr = generic_getxattr,
3608 .listxattr = btrfs_listxattr,
3609 .removexattr = generic_removexattr,
3610 .permission = btrfs_permission,
3612 static struct inode_operations btrfs_dir_ro_inode_operations = {
3613 .lookup = btrfs_lookup,
3614 .permission = btrfs_permission,
3616 static struct file_operations btrfs_dir_file_operations = {
3617 .llseek = generic_file_llseek,
3618 .read = generic_read_dir,
3619 .readdir = btrfs_readdir,
3620 .unlocked_ioctl = btrfs_ioctl,
3621 #ifdef CONFIG_COMPAT
3622 .compat_ioctl = btrfs_ioctl,
3626 static struct extent_io_ops btrfs_extent_io_ops = {
3627 .fill_delalloc = run_delalloc_range,
3628 .submit_bio_hook = btrfs_submit_bio_hook,
3629 .merge_bio_hook = btrfs_merge_bio_hook,
3630 .readpage_io_hook = btrfs_readpage_io_hook,
3631 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
3632 .readpage_io_failed_hook = btrfs_readpage_io_failed_hook,
3633 .set_bit_hook = btrfs_set_bit_hook,
3634 .clear_bit_hook = btrfs_clear_bit_hook,
3637 static struct address_space_operations btrfs_aops = {
3638 .readpage = btrfs_readpage,
3639 .writepage = btrfs_writepage,
3640 .writepages = btrfs_writepages,
3641 .readpages = btrfs_readpages,
3642 .sync_page = block_sync_page,
3644 .direct_IO = btrfs_direct_IO,
3645 .invalidatepage = btrfs_invalidatepage,
3646 .releasepage = btrfs_releasepage,
3647 .set_page_dirty = __set_page_dirty_nobuffers,
3650 static struct address_space_operations btrfs_symlink_aops = {
3651 .readpage = btrfs_readpage,
3652 .writepage = btrfs_writepage,
3653 .invalidatepage = btrfs_invalidatepage,
3654 .releasepage = btrfs_releasepage,
3657 static struct inode_operations btrfs_file_inode_operations = {
3658 .truncate = btrfs_truncate,
3659 .getattr = btrfs_getattr,
3660 .setattr = btrfs_setattr,
3661 .setxattr = generic_setxattr,
3662 .getxattr = generic_getxattr,
3663 .listxattr = btrfs_listxattr,
3664 .removexattr = generic_removexattr,
3665 .permission = btrfs_permission,
3667 static struct inode_operations btrfs_special_inode_operations = {
3668 .getattr = btrfs_getattr,
3669 .setattr = btrfs_setattr,
3670 .permission = btrfs_permission,
3672 static struct inode_operations btrfs_symlink_inode_operations = {
3673 .readlink = generic_readlink,
3674 .follow_link = page_follow_link_light,
3675 .put_link = page_put_link,
3676 .permission = btrfs_permission,