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/buffer_head.h>
21 #include <linux/pagemap.h>
22 #include <linux/highmem.h>
23 #include <linux/time.h>
24 #include <linux/init.h>
25 #include <linux/string.h>
26 #include <linux/smp_lock.h>
27 #include <linux/backing-dev.h>
28 #include <linux/mpage.h>
29 #include <linux/swap.h>
30 #include <linux/writeback.h>
31 #include <linux/statfs.h>
32 #include <linux/compat.h>
33 #include <linux/bit_spinlock.h>
34 #include <linux/version.h>
35 #include <linux/xattr.h>
38 #include "transaction.h"
39 #include "btrfs_inode.h"
41 #include "print-tree.h"
43 struct btrfs_iget_args
{
45 struct btrfs_root
*root
;
48 static struct inode_operations btrfs_dir_inode_operations
;
49 static struct inode_operations btrfs_symlink_inode_operations
;
50 static struct inode_operations btrfs_dir_ro_inode_operations
;
51 static struct inode_operations btrfs_special_inode_operations
;
52 static struct inode_operations btrfs_file_inode_operations
;
53 static struct address_space_operations btrfs_aops
;
54 static struct address_space_operations btrfs_symlink_aops
;
55 static struct file_operations btrfs_dir_file_operations
;
56 static struct extent_io_ops btrfs_extent_io_ops
;
58 static struct kmem_cache
*btrfs_inode_cachep
;
59 struct kmem_cache
*btrfs_trans_handle_cachep
;
60 struct kmem_cache
*btrfs_transaction_cachep
;
61 struct kmem_cache
*btrfs_bit_radix_cachep
;
62 struct kmem_cache
*btrfs_path_cachep
;
65 static unsigned char btrfs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
66 [S_IFREG
>> S_SHIFT
] = BTRFS_FT_REG_FILE
,
67 [S_IFDIR
>> S_SHIFT
] = BTRFS_FT_DIR
,
68 [S_IFCHR
>> S_SHIFT
] = BTRFS_FT_CHRDEV
,
69 [S_IFBLK
>> S_SHIFT
] = BTRFS_FT_BLKDEV
,
70 [S_IFIFO
>> S_SHIFT
] = BTRFS_FT_FIFO
,
71 [S_IFSOCK
>> S_SHIFT
] = BTRFS_FT_SOCK
,
72 [S_IFLNK
>> S_SHIFT
] = BTRFS_FT_SYMLINK
,
75 int btrfs_check_free_space(struct btrfs_root
*root
, u64 num_required
,
78 u64 total
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
79 u64 used
= btrfs_super_bytes_used(&root
->fs_info
->super_copy
);
92 spin_lock(&root
->fs_info
->delalloc_lock
);
93 if (used
+ root
->fs_info
->delalloc_bytes
+ num_required
> thresh
)
95 spin_unlock(&root
->fs_info
->delalloc_lock
);
99 static int cow_file_range(struct inode
*inode
, u64 start
, u64 end
)
101 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
102 struct btrfs_trans_handle
*trans
;
106 u64 blocksize
= root
->sectorsize
;
107 u64 orig_start
= start
;
109 struct btrfs_key ins
;
112 trans
= btrfs_start_transaction(root
, 1);
114 btrfs_set_trans_block_group(trans
, inode
);
116 num_bytes
= (end
- start
+ blocksize
) & ~(blocksize
- 1);
117 num_bytes
= max(blocksize
, num_bytes
);
118 ret
= btrfs_drop_extents(trans
, root
, inode
,
119 start
, start
+ num_bytes
, start
, &alloc_hint
);
120 orig_num_bytes
= num_bytes
;
122 if (alloc_hint
== EXTENT_MAP_INLINE
)
125 while(num_bytes
> 0) {
126 cur_alloc_size
= min(num_bytes
, root
->fs_info
->max_extent
);
127 ret
= btrfs_alloc_extent(trans
, root
, cur_alloc_size
,
128 root
->root_key
.objectid
,
130 inode
->i_ino
, start
, 0,
131 alloc_hint
, (u64
)-1, &ins
, 1);
136 ret
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
137 start
, ins
.objectid
, ins
.offset
,
139 btrfs_check_file(root
, inode
);
140 num_bytes
-= cur_alloc_size
;
141 alloc_hint
= ins
.objectid
+ ins
.offset
;
142 start
+= cur_alloc_size
;
144 btrfs_drop_extent_cache(inode
, orig_start
,
145 orig_start
+ orig_num_bytes
- 1);
146 btrfs_add_ordered_inode(inode
);
148 btrfs_end_transaction(trans
, root
);
152 static int run_delalloc_nocow(struct inode
*inode
, u64 start
, u64 end
)
160 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
161 struct extent_buffer
*leaf
;
163 struct btrfs_path
*path
;
164 struct btrfs_file_extent_item
*item
;
167 struct btrfs_key found_key
;
169 total_fs_bytes
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
170 path
= btrfs_alloc_path();
173 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
174 inode
->i_ino
, start
, 0);
176 btrfs_free_path(path
);
182 if (path
->slots
[0] == 0)
187 leaf
= path
->nodes
[0];
188 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
189 struct btrfs_file_extent_item
);
191 /* are we inside the extent that was found? */
192 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
193 found_type
= btrfs_key_type(&found_key
);
194 if (found_key
.objectid
!= inode
->i_ino
||
195 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
199 found_type
= btrfs_file_extent_type(leaf
, item
);
200 extent_start
= found_key
.offset
;
201 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
202 u64 extent_num_bytes
;
204 extent_num_bytes
= btrfs_file_extent_num_bytes(leaf
, item
);
205 extent_end
= extent_start
+ extent_num_bytes
;
208 if (loops
&& start
!= extent_start
)
211 if (start
< extent_start
|| start
>= extent_end
)
214 cow_end
= min(end
, extent_end
- 1);
215 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
220 * we may be called by the resizer, make sure we're inside
221 * the limits of the FS
223 if (bytenr
+ extent_num_bytes
> total_fs_bytes
)
226 if (btrfs_count_snapshots_in_path(root
, path
, bytenr
) != 1) {
236 btrfs_free_path(path
);
239 btrfs_release_path(root
, path
);
244 cow_file_range(inode
, start
, cow_end
);
249 static int run_delalloc_range(struct inode
*inode
, u64 start
, u64 end
)
251 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
254 mutex_lock(&root
->fs_info
->fs_mutex
);
255 if (btrfs_test_opt(root
, NODATACOW
) ||
256 btrfs_test_flag(inode
, NODATACOW
))
257 ret
= run_delalloc_nocow(inode
, start
, end
);
259 ret
= cow_file_range(inode
, start
, end
);
261 spin_lock(&root
->fs_info
->delalloc_lock
);
262 num_bytes
= end
+ 1 - start
;
263 if (root
->fs_info
->delalloc_bytes
< num_bytes
) {
264 printk("delalloc accounting error total %llu sub %llu\n",
265 root
->fs_info
->delalloc_bytes
, num_bytes
);
267 root
->fs_info
->delalloc_bytes
-= num_bytes
;
269 spin_unlock(&root
->fs_info
->delalloc_lock
);
271 mutex_unlock(&root
->fs_info
->fs_mutex
);
275 int btrfs_writepage_io_hook(struct page
*page
, u64 start
, u64 end
)
277 struct inode
*inode
= page
->mapping
->host
;
278 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
279 struct btrfs_trans_handle
*trans
;
282 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
283 size_t offset
= start
- page_start
;
284 if (btrfs_test_opt(root
, NODATASUM
) ||
285 btrfs_test_flag(inode
, NODATASUM
))
287 mutex_lock(&root
->fs_info
->fs_mutex
);
288 trans
= btrfs_start_transaction(root
, 1);
289 btrfs_set_trans_block_group(trans
, inode
);
291 btrfs_csum_file_block(trans
, root
, inode
, inode
->i_ino
,
292 start
, kaddr
+ offset
, end
- start
+ 1);
294 ret
= btrfs_end_transaction(trans
, root
);
296 mutex_unlock(&root
->fs_info
->fs_mutex
);
300 int btrfs_readpage_io_hook(struct page
*page
, u64 start
, u64 end
)
303 struct inode
*inode
= page
->mapping
->host
;
304 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
305 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
306 struct btrfs_csum_item
*item
;
307 struct btrfs_path
*path
= NULL
;
309 if (btrfs_test_opt(root
, NODATASUM
) ||
310 btrfs_test_flag(inode
, NODATASUM
))
312 mutex_lock(&root
->fs_info
->fs_mutex
);
313 path
= btrfs_alloc_path();
314 item
= btrfs_lookup_csum(NULL
, root
, path
, inode
->i_ino
, start
, 0);
317 /* a csum that isn't present is a preallocated region. */
318 if (ret
== -ENOENT
|| ret
== -EFBIG
)
323 read_extent_buffer(path
->nodes
[0], &csum
, (unsigned long)item
,
325 set_state_private(io_tree
, start
, csum
);
328 btrfs_free_path(path
);
329 mutex_unlock(&root
->fs_info
->fs_mutex
);
333 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
)
335 size_t offset
= start
- ((u64
)page
->index
<< PAGE_CACHE_SHIFT
);
336 struct inode
*inode
= page
->mapping
->host
;
337 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
341 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
345 if (btrfs_test_opt(root
, NODATASUM
) ||
346 btrfs_test_flag(inode
, NODATASUM
))
349 ret
= get_state_private(io_tree
, start
, &private);
350 local_irq_save(flags
);
351 kaddr
= kmap_atomic(page
, KM_IRQ0
);
355 csum
= btrfs_csum_data(root
, kaddr
+ offset
, csum
, end
- start
+ 1);
356 btrfs_csum_final(csum
, (char *)&csum
);
357 if (csum
!= private) {
360 kunmap_atomic(kaddr
, KM_IRQ0
);
361 local_irq_restore(flags
);
365 printk("btrfs csum failed ino %lu off %llu\n",
366 page
->mapping
->host
->i_ino
, (unsigned long long)start
);
367 memset(kaddr
+ offset
, 1, end
- start
+ 1);
368 flush_dcache_page(page
);
369 kunmap_atomic(kaddr
, KM_IRQ0
);
370 local_irq_restore(flags
);
374 void btrfs_read_locked_inode(struct inode
*inode
)
376 struct btrfs_path
*path
;
377 struct extent_buffer
*leaf
;
378 struct btrfs_inode_item
*inode_item
;
379 struct btrfs_inode_timespec
*tspec
;
380 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
381 struct btrfs_key location
;
382 u64 alloc_group_block
;
386 path
= btrfs_alloc_path();
388 mutex_lock(&root
->fs_info
->fs_mutex
);
389 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
391 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
395 leaf
= path
->nodes
[0];
396 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
397 struct btrfs_inode_item
);
399 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
400 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
401 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
402 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
403 inode
->i_size
= btrfs_inode_size(leaf
, inode_item
);
405 tspec
= btrfs_inode_atime(inode_item
);
406 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
407 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
409 tspec
= btrfs_inode_mtime(inode_item
);
410 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
411 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
413 tspec
= btrfs_inode_ctime(inode_item
);
414 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
415 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
417 inode
->i_blocks
= btrfs_inode_nblocks(leaf
, inode_item
);
418 inode
->i_generation
= btrfs_inode_generation(leaf
, inode_item
);
420 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
422 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
423 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
425 BTRFS_I(inode
)->flags
= btrfs_inode_flags(leaf
, inode_item
);
426 if (!BTRFS_I(inode
)->block_group
) {
427 BTRFS_I(inode
)->block_group
= btrfs_find_block_group(root
,
430 btrfs_free_path(path
);
433 mutex_unlock(&root
->fs_info
->fs_mutex
);
435 switch (inode
->i_mode
& S_IFMT
) {
437 inode
->i_mapping
->a_ops
= &btrfs_aops
;
438 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
439 inode
->i_fop
= &btrfs_file_operations
;
440 inode
->i_op
= &btrfs_file_inode_operations
;
443 inode
->i_fop
= &btrfs_dir_file_operations
;
444 if (root
== root
->fs_info
->tree_root
)
445 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
447 inode
->i_op
= &btrfs_dir_inode_operations
;
450 inode
->i_op
= &btrfs_symlink_inode_operations
;
451 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
454 init_special_inode(inode
, inode
->i_mode
, rdev
);
460 btrfs_release_path(root
, path
);
461 btrfs_free_path(path
);
462 mutex_unlock(&root
->fs_info
->fs_mutex
);
463 make_bad_inode(inode
);
466 static void fill_inode_item(struct extent_buffer
*leaf
,
467 struct btrfs_inode_item
*item
,
470 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
471 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
472 btrfs_set_inode_size(leaf
, item
, inode
->i_size
);
473 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
474 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
476 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
477 inode
->i_atime
.tv_sec
);
478 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
479 inode
->i_atime
.tv_nsec
);
481 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
482 inode
->i_mtime
.tv_sec
);
483 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
484 inode
->i_mtime
.tv_nsec
);
486 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
487 inode
->i_ctime
.tv_sec
);
488 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
489 inode
->i_ctime
.tv_nsec
);
491 btrfs_set_inode_nblocks(leaf
, item
, inode
->i_blocks
);
492 btrfs_set_inode_generation(leaf
, item
, inode
->i_generation
);
493 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
494 btrfs_set_inode_flags(leaf
, item
, BTRFS_I(inode
)->flags
);
495 btrfs_set_inode_block_group(leaf
, item
,
496 BTRFS_I(inode
)->block_group
->key
.objectid
);
499 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
500 struct btrfs_root
*root
,
503 struct btrfs_inode_item
*inode_item
;
504 struct btrfs_path
*path
;
505 struct extent_buffer
*leaf
;
508 path
= btrfs_alloc_path();
510 ret
= btrfs_lookup_inode(trans
, root
, path
,
511 &BTRFS_I(inode
)->location
, 1);
518 leaf
= path
->nodes
[0];
519 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
520 struct btrfs_inode_item
);
522 fill_inode_item(leaf
, inode_item
, inode
);
523 btrfs_mark_buffer_dirty(leaf
);
524 btrfs_set_inode_last_trans(trans
, inode
);
527 btrfs_release_path(root
, path
);
528 btrfs_free_path(path
);
533 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
534 struct btrfs_root
*root
,
536 struct dentry
*dentry
)
538 struct btrfs_path
*path
;
539 const char *name
= dentry
->d_name
.name
;
540 int name_len
= dentry
->d_name
.len
;
542 struct extent_buffer
*leaf
;
543 struct btrfs_dir_item
*di
;
544 struct btrfs_key key
;
546 path
= btrfs_alloc_path();
552 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
562 leaf
= path
->nodes
[0];
563 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
564 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
567 btrfs_release_path(root
, path
);
569 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
570 key
.objectid
, name
, name_len
, -1);
579 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
581 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
582 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
583 dentry
->d_inode
->i_ino
,
584 dentry
->d_parent
->d_inode
->i_ino
);
586 printk("failed to delete reference to %.*s, "
587 "inode %lu parent %lu\n", name_len
, name
,
588 dentry
->d_inode
->i_ino
,
589 dentry
->d_parent
->d_inode
->i_ino
);
592 btrfs_free_path(path
);
594 dir
->i_size
-= name_len
* 2;
595 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
596 btrfs_update_inode(trans
, root
, dir
);
597 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
598 dentry
->d_inode
->i_nlink
--;
600 drop_nlink(dentry
->d_inode
);
602 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
603 dir
->i_sb
->s_dirt
= 1;
608 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
610 struct btrfs_root
*root
;
611 struct btrfs_trans_handle
*trans
;
612 struct inode
*inode
= dentry
->d_inode
;
614 unsigned long nr
= 0;
616 root
= BTRFS_I(dir
)->root
;
617 mutex_lock(&root
->fs_info
->fs_mutex
);
619 ret
= btrfs_check_free_space(root
, 1, 1);
623 trans
= btrfs_start_transaction(root
, 1);
625 btrfs_set_trans_block_group(trans
, dir
);
626 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
627 nr
= trans
->blocks_used
;
629 if (inode
->i_nlink
== 0) {
631 /* if the inode isn't linked anywhere,
632 * we don't need to worry about
635 found
= btrfs_del_ordered_inode(inode
);
637 atomic_dec(&inode
->i_count
);
641 btrfs_end_transaction(trans
, root
);
643 mutex_unlock(&root
->fs_info
->fs_mutex
);
644 btrfs_btree_balance_dirty(root
, nr
);
645 btrfs_throttle(root
);
649 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
651 struct inode
*inode
= dentry
->d_inode
;
654 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
655 struct btrfs_trans_handle
*trans
;
656 unsigned long nr
= 0;
658 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
661 mutex_lock(&root
->fs_info
->fs_mutex
);
662 ret
= btrfs_check_free_space(root
, 1, 1);
666 trans
= btrfs_start_transaction(root
, 1);
667 btrfs_set_trans_block_group(trans
, dir
);
669 /* now the directory is empty */
670 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
675 nr
= trans
->blocks_used
;
676 ret
= btrfs_end_transaction(trans
, root
);
678 mutex_unlock(&root
->fs_info
->fs_mutex
);
679 btrfs_btree_balance_dirty(root
, nr
);
680 btrfs_throttle(root
);
687 static int btrfs_free_inode(struct btrfs_trans_handle
*trans
,
688 struct btrfs_root
*root
,
691 struct btrfs_path
*path
;
696 path
= btrfs_alloc_path();
698 ret
= btrfs_lookup_inode(trans
, root
, path
,
699 &BTRFS_I(inode
)->location
, -1);
703 ret
= btrfs_del_item(trans
, root
, path
);
704 btrfs_free_path(path
);
709 * this can truncate away extent items, csum items and directory items.
710 * It starts at a high offset and removes keys until it can't find
711 * any higher than i_size.
713 * csum items that cross the new i_size are truncated to the new size
716 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
717 struct btrfs_root
*root
,
721 struct btrfs_path
*path
;
722 struct btrfs_key key
;
723 struct btrfs_key found_key
;
725 struct extent_buffer
*leaf
;
726 struct btrfs_file_extent_item
*fi
;
727 u64 extent_start
= 0;
728 u64 extent_num_bytes
= 0;
734 int extent_type
= -1;
736 btrfs_drop_extent_cache(inode
, inode
->i_size
, (u64
)-1);
737 path
= btrfs_alloc_path();
741 /* FIXME, add redo link to tree so we don't leak on crash */
742 key
.objectid
= inode
->i_ino
;
743 key
.offset
= (u64
)-1;
747 btrfs_init_path(path
);
749 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
754 BUG_ON(path
->slots
[0] == 0);
757 leaf
= path
->nodes
[0];
758 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
759 found_type
= btrfs_key_type(&found_key
);
761 if (found_key
.objectid
!= inode
->i_ino
)
764 if (found_type
!= BTRFS_CSUM_ITEM_KEY
&&
765 found_type
!= BTRFS_DIR_ITEM_KEY
&&
766 found_type
!= BTRFS_DIR_INDEX_KEY
&&
767 found_type
!= BTRFS_EXTENT_DATA_KEY
)
770 item_end
= found_key
.offset
;
771 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
772 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
773 struct btrfs_file_extent_item
);
774 extent_type
= btrfs_file_extent_type(leaf
, fi
);
775 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
777 btrfs_file_extent_num_bytes(leaf
, fi
);
778 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
779 struct btrfs_item
*item
= btrfs_item_nr(leaf
,
781 item_end
+= btrfs_file_extent_inline_len(leaf
,
786 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
787 ret
= btrfs_csum_truncate(trans
, root
, path
,
791 if (item_end
< inode
->i_size
) {
792 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
793 found_type
= BTRFS_INODE_ITEM_KEY
;
794 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
795 found_type
= BTRFS_CSUM_ITEM_KEY
;
796 } else if (found_type
) {
801 btrfs_set_key_type(&key
, found_type
);
802 btrfs_release_path(root
, path
);
805 if (found_key
.offset
>= inode
->i_size
)
811 /* FIXME, shrink the extent if the ref count is only 1 */
812 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
815 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
817 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
820 btrfs_file_extent_num_bytes(leaf
, fi
);
821 extent_num_bytes
= inode
->i_size
-
822 found_key
.offset
+ root
->sectorsize
- 1;
823 btrfs_set_file_extent_num_bytes(leaf
, fi
,
825 num_dec
= (orig_num_bytes
-
826 extent_num_bytes
) >> 9;
827 if (extent_start
!= 0) {
828 inode
->i_blocks
-= num_dec
;
830 btrfs_mark_buffer_dirty(leaf
);
833 btrfs_file_extent_disk_num_bytes(leaf
,
835 /* FIXME blocksize != 4096 */
836 num_dec
= btrfs_file_extent_num_bytes(leaf
,
838 if (extent_start
!= 0) {
840 inode
->i_blocks
-= num_dec
;
842 root_gen
= btrfs_header_generation(leaf
);
843 root_owner
= btrfs_header_owner(leaf
);
845 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
&&
847 u32 newsize
= inode
->i_size
- found_key
.offset
;
848 newsize
= btrfs_file_extent_calc_inline_size(newsize
);
849 ret
= btrfs_truncate_item(trans
, root
, path
,
855 ret
= btrfs_del_item(trans
, root
, path
);
861 btrfs_release_path(root
, path
);
863 ret
= btrfs_free_extent(trans
, root
, extent_start
,
866 root_gen
, inode
->i_ino
,
867 found_key
.offset
, 0);
873 btrfs_release_path(root
, path
);
874 btrfs_free_path(path
);
875 inode
->i_sb
->s_dirt
= 1;
879 static int btrfs_cow_one_page(struct inode
*inode
, struct page
*page
,
883 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
884 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
885 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
886 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
887 u64 existing_delalloc
;
891 WARN_ON(!PageLocked(page
));
892 set_page_extent_mapped(page
);
894 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
895 delalloc_start
= page_start
;
896 existing_delalloc
= count_range_bits(&BTRFS_I(inode
)->io_tree
,
897 &delalloc_start
, page_end
,
898 PAGE_CACHE_SIZE
, EXTENT_DELALLOC
);
899 set_extent_delalloc(&BTRFS_I(inode
)->io_tree
, page_start
,
902 spin_lock(&root
->fs_info
->delalloc_lock
);
903 root
->fs_info
->delalloc_bytes
+= PAGE_CACHE_SIZE
- existing_delalloc
;
904 spin_unlock(&root
->fs_info
->delalloc_lock
);
906 if (zero_start
!= PAGE_CACHE_SIZE
) {
908 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
909 flush_dcache_page(page
);
912 set_page_dirty(page
);
913 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
919 * taken from block_truncate_page, but does cow as it zeros out
920 * any bytes left in the last page in the file.
922 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
924 struct inode
*inode
= mapping
->host
;
925 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
926 u32 blocksize
= root
->sectorsize
;
927 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
928 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
933 if ((offset
& (blocksize
- 1)) == 0)
937 page
= grab_cache_page(mapping
, index
);
940 if (!PageUptodate(page
)) {
941 ret
= btrfs_readpage(NULL
, page
);
943 if (!PageUptodate(page
)) {
948 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
950 ret
= btrfs_cow_one_page(inode
, page
, offset
);
953 page_cache_release(page
);
958 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
960 struct inode
*inode
= dentry
->d_inode
;
963 err
= inode_change_ok(inode
, attr
);
967 if (S_ISREG(inode
->i_mode
) &&
968 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
969 struct btrfs_trans_handle
*trans
;
970 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
971 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
973 u64 mask
= root
->sectorsize
- 1;
974 u64 pos
= (inode
->i_size
+ mask
) & ~mask
;
975 u64 block_end
= attr
->ia_size
| mask
;
980 if (attr
->ia_size
<= pos
)
983 if (pos
!= inode
->i_size
)
984 hole_start
= pos
+ root
->sectorsize
;
988 mutex_lock(&root
->fs_info
->fs_mutex
);
989 err
= btrfs_check_free_space(root
, 1, 0);
990 mutex_unlock(&root
->fs_info
->fs_mutex
);
994 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
996 lock_extent(io_tree
, pos
, block_end
, GFP_NOFS
);
997 hole_size
= block_end
- hole_start
;
999 mutex_lock(&root
->fs_info
->fs_mutex
);
1000 trans
= btrfs_start_transaction(root
, 1);
1001 btrfs_set_trans_block_group(trans
, inode
);
1002 err
= btrfs_drop_extents(trans
, root
, inode
,
1003 pos
, block_end
, pos
,
1006 if (alloc_hint
!= EXTENT_MAP_INLINE
) {
1007 err
= btrfs_insert_file_extent(trans
, root
,
1011 btrfs_drop_extent_cache(inode
, hole_start
,
1013 btrfs_check_file(root
, inode
);
1015 btrfs_end_transaction(trans
, root
);
1016 mutex_unlock(&root
->fs_info
->fs_mutex
);
1017 unlock_extent(io_tree
, pos
, block_end
, GFP_NOFS
);
1022 err
= inode_setattr(inode
, attr
);
1027 void btrfs_put_inode(struct inode
*inode
)
1031 if (!BTRFS_I(inode
)->ordered_trans
) {
1035 if (mapping_tagged(inode
->i_mapping
, PAGECACHE_TAG_DIRTY
) ||
1036 mapping_tagged(inode
->i_mapping
, PAGECACHE_TAG_WRITEBACK
))
1039 ret
= btrfs_del_ordered_inode(inode
);
1041 atomic_dec(&inode
->i_count
);
1045 void btrfs_delete_inode(struct inode
*inode
)
1047 struct btrfs_trans_handle
*trans
;
1048 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1052 truncate_inode_pages(&inode
->i_data
, 0);
1053 if (is_bad_inode(inode
)) {
1058 mutex_lock(&root
->fs_info
->fs_mutex
);
1059 trans
= btrfs_start_transaction(root
, 1);
1061 btrfs_set_trans_block_group(trans
, inode
);
1062 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
1064 goto no_delete_lock
;
1065 ret
= btrfs_delete_xattrs(trans
, root
, inode
);
1067 goto no_delete_lock
;
1068 ret
= btrfs_free_inode(trans
, root
, inode
);
1070 goto no_delete_lock
;
1071 nr
= trans
->blocks_used
;
1073 btrfs_end_transaction(trans
, root
);
1074 mutex_unlock(&root
->fs_info
->fs_mutex
);
1075 btrfs_btree_balance_dirty(root
, nr
);
1076 btrfs_throttle(root
);
1080 nr
= trans
->blocks_used
;
1081 btrfs_end_transaction(trans
, root
);
1082 mutex_unlock(&root
->fs_info
->fs_mutex
);
1083 btrfs_btree_balance_dirty(root
, nr
);
1084 btrfs_throttle(root
);
1090 * this returns the key found in the dir entry in the location pointer.
1091 * If no dir entries were found, location->objectid is 0.
1093 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
1094 struct btrfs_key
*location
)
1096 const char *name
= dentry
->d_name
.name
;
1097 int namelen
= dentry
->d_name
.len
;
1098 struct btrfs_dir_item
*di
;
1099 struct btrfs_path
*path
;
1100 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1103 if (namelen
== 1 && strcmp(name
, ".") == 0) {
1104 location
->objectid
= dir
->i_ino
;
1105 location
->type
= BTRFS_INODE_ITEM_KEY
;
1106 location
->offset
= 0;
1109 path
= btrfs_alloc_path();
1112 if (namelen
== 2 && strcmp(name
, "..") == 0) {
1113 struct btrfs_key key
;
1114 struct extent_buffer
*leaf
;
1118 key
.objectid
= dir
->i_ino
;
1119 btrfs_set_key_type(&key
, BTRFS_INODE_REF_KEY
);
1121 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1125 leaf
= path
->nodes
[0];
1126 slot
= path
->slots
[0];
1127 nritems
= btrfs_header_nritems(leaf
);
1128 if (slot
>= nritems
)
1131 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
1132 if (key
.objectid
!= dir
->i_ino
||
1133 key
.type
!= BTRFS_INODE_REF_KEY
) {
1136 location
->objectid
= key
.offset
;
1137 location
->type
= BTRFS_INODE_ITEM_KEY
;
1138 location
->offset
= 0;
1142 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
1146 if (!di
|| IS_ERR(di
)) {
1149 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
1151 btrfs_free_path(path
);
1154 location
->objectid
= 0;
1159 * when we hit a tree root in a directory, the btrfs part of the inode
1160 * needs to be changed to reflect the root directory of the tree root. This
1161 * is kind of like crossing a mount point.
1163 static int fixup_tree_root_location(struct btrfs_root
*root
,
1164 struct btrfs_key
*location
,
1165 struct btrfs_root
**sub_root
,
1166 struct dentry
*dentry
)
1168 struct btrfs_path
*path
;
1169 struct btrfs_root_item
*ri
;
1171 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
1173 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
1176 path
= btrfs_alloc_path();
1178 mutex_lock(&root
->fs_info
->fs_mutex
);
1180 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
1181 dentry
->d_name
.name
,
1182 dentry
->d_name
.len
);
1183 if (IS_ERR(*sub_root
))
1184 return PTR_ERR(*sub_root
);
1186 ri
= &(*sub_root
)->root_item
;
1187 location
->objectid
= btrfs_root_dirid(ri
);
1188 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1189 location
->offset
= 0;
1191 btrfs_free_path(path
);
1192 mutex_unlock(&root
->fs_info
->fs_mutex
);
1196 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
1198 struct btrfs_iget_args
*args
= p
;
1199 inode
->i_ino
= args
->ino
;
1200 BTRFS_I(inode
)->root
= args
->root
;
1201 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1202 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1203 inode
->i_mapping
, GFP_NOFS
);
1207 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
1209 struct btrfs_iget_args
*args
= opaque
;
1210 return (args
->ino
== inode
->i_ino
&&
1211 args
->root
== BTRFS_I(inode
)->root
);
1214 struct inode
*btrfs_ilookup(struct super_block
*s
, u64 objectid
,
1217 struct btrfs_iget_args args
;
1218 args
.ino
= objectid
;
1219 args
.root
= btrfs_lookup_fs_root(btrfs_sb(s
)->fs_info
, root_objectid
);
1224 return ilookup5(s
, objectid
, btrfs_find_actor
, (void *)&args
);
1227 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1228 struct btrfs_root
*root
)
1230 struct inode
*inode
;
1231 struct btrfs_iget_args args
;
1232 args
.ino
= objectid
;
1235 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
1236 btrfs_init_locked_inode
,
1241 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
1242 struct nameidata
*nd
)
1244 struct inode
* inode
;
1245 struct btrfs_inode
*bi
= BTRFS_I(dir
);
1246 struct btrfs_root
*root
= bi
->root
;
1247 struct btrfs_root
*sub_root
= root
;
1248 struct btrfs_key location
;
1251 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
1252 return ERR_PTR(-ENAMETOOLONG
);
1254 mutex_lock(&root
->fs_info
->fs_mutex
);
1255 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
1256 mutex_unlock(&root
->fs_info
->fs_mutex
);
1259 return ERR_PTR(ret
);
1262 if (location
.objectid
) {
1263 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
1266 return ERR_PTR(ret
);
1268 return ERR_PTR(-ENOENT
);
1269 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
1272 return ERR_PTR(-EACCES
);
1273 if (inode
->i_state
& I_NEW
) {
1274 /* the inode and parent dir are two different roots */
1275 if (sub_root
!= root
) {
1277 sub_root
->inode
= inode
;
1279 BTRFS_I(inode
)->root
= sub_root
;
1280 memcpy(&BTRFS_I(inode
)->location
, &location
,
1282 btrfs_read_locked_inode(inode
);
1283 unlock_new_inode(inode
);
1286 return d_splice_alias(inode
, dentry
);
1289 static unsigned char btrfs_filetype_table
[] = {
1290 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
1293 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
1295 struct inode
*inode
= filp
->f_dentry
->d_inode
;
1296 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1297 struct btrfs_item
*item
;
1298 struct btrfs_dir_item
*di
;
1299 struct btrfs_key key
;
1300 struct btrfs_key found_key
;
1301 struct btrfs_path
*path
;
1304 struct extent_buffer
*leaf
;
1307 unsigned char d_type
;
1312 int key_type
= BTRFS_DIR_INDEX_KEY
;
1317 /* FIXME, use a real flag for deciding about the key type */
1318 if (root
->fs_info
->tree_root
== root
)
1319 key_type
= BTRFS_DIR_ITEM_KEY
;
1321 /* special case for "." */
1322 if (filp
->f_pos
== 0) {
1323 over
= filldir(dirent
, ".", 1,
1331 mutex_lock(&root
->fs_info
->fs_mutex
);
1332 key
.objectid
= inode
->i_ino
;
1333 path
= btrfs_alloc_path();
1336 /* special case for .., just use the back ref */
1337 if (filp
->f_pos
== 1) {
1338 btrfs_set_key_type(&key
, BTRFS_INODE_REF_KEY
);
1340 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
) {
1346 btrfs_release_path(root
, path
);
1347 goto read_dir_items
;
1349 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1350 btrfs_release_path(root
, path
);
1351 if (found_key
.objectid
!= key
.objectid
||
1352 found_key
.type
!= BTRFS_INODE_REF_KEY
)
1353 goto read_dir_items
;
1354 over
= filldir(dirent
, "..", 2,
1355 2, found_key
.offset
, DT_DIR
);
1362 btrfs_set_key_type(&key
, key_type
);
1363 key
.offset
= filp
->f_pos
;
1365 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1370 leaf
= path
->nodes
[0];
1371 nritems
= btrfs_header_nritems(leaf
);
1372 slot
= path
->slots
[0];
1373 if (advance
|| slot
>= nritems
) {
1374 if (slot
>= nritems
-1) {
1375 ret
= btrfs_next_leaf(root
, path
);
1378 leaf
= path
->nodes
[0];
1379 nritems
= btrfs_header_nritems(leaf
);
1380 slot
= path
->slots
[0];
1387 item
= btrfs_item_nr(leaf
, slot
);
1388 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1390 if (found_key
.objectid
!= key
.objectid
)
1392 if (btrfs_key_type(&found_key
) != key_type
)
1394 if (found_key
.offset
< filp
->f_pos
)
1397 filp
->f_pos
= found_key
.offset
;
1399 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1401 di_total
= btrfs_item_size(leaf
, item
);
1402 while(di_cur
< di_total
) {
1403 struct btrfs_key location
;
1405 name_len
= btrfs_dir_name_len(leaf
, di
);
1406 if (name_len
< 32) {
1407 name_ptr
= tmp_name
;
1409 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
1412 read_extent_buffer(leaf
, name_ptr
,
1413 (unsigned long)(di
+ 1), name_len
);
1415 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
1416 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
1417 over
= filldir(dirent
, name_ptr
, name_len
,
1422 if (name_ptr
!= tmp_name
)
1427 di_len
= btrfs_dir_name_len(leaf
, di
) +
1428 btrfs_dir_data_len(leaf
, di
) +sizeof(*di
);
1430 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1437 btrfs_release_path(root
, path
);
1438 btrfs_free_path(path
);
1439 mutex_unlock(&root
->fs_info
->fs_mutex
);
1443 int btrfs_write_inode(struct inode
*inode
, int wait
)
1445 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1446 struct btrfs_trans_handle
*trans
;
1450 mutex_lock(&root
->fs_info
->fs_mutex
);
1451 trans
= btrfs_start_transaction(root
, 1);
1452 btrfs_set_trans_block_group(trans
, inode
);
1453 ret
= btrfs_commit_transaction(trans
, root
);
1454 mutex_unlock(&root
->fs_info
->fs_mutex
);
1460 * This is somewhat expensive, updating the tree every time the
1461 * inode changes. But, it is most likely to find the inode in cache.
1462 * FIXME, needs more benchmarking...there are no reasons other than performance
1463 * to keep or drop this code.
1465 void btrfs_dirty_inode(struct inode
*inode
)
1467 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1468 struct btrfs_trans_handle
*trans
;
1470 mutex_lock(&root
->fs_info
->fs_mutex
);
1471 trans
= btrfs_start_transaction(root
, 1);
1472 btrfs_set_trans_block_group(trans
, inode
);
1473 btrfs_update_inode(trans
, root
, inode
);
1474 btrfs_end_transaction(trans
, root
);
1475 mutex_unlock(&root
->fs_info
->fs_mutex
);
1478 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1479 struct btrfs_root
*root
,
1481 struct btrfs_block_group_cache
*group
,
1484 struct inode
*inode
;
1485 struct btrfs_inode_item
*inode_item
;
1486 struct btrfs_key
*location
;
1487 struct btrfs_path
*path
;
1491 path
= btrfs_alloc_path();
1494 inode
= new_inode(root
->fs_info
->sb
);
1496 return ERR_PTR(-ENOMEM
);
1498 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1499 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1500 inode
->i_mapping
, GFP_NOFS
);
1501 BTRFS_I(inode
)->root
= root
;
1507 group
= btrfs_find_block_group(root
, group
, 0, 0, owner
);
1508 BTRFS_I(inode
)->block_group
= group
;
1509 BTRFS_I(inode
)->flags
= 0;
1510 ret
= btrfs_insert_empty_inode(trans
, root
, path
, objectid
);
1514 inode
->i_uid
= current
->fsuid
;
1515 inode
->i_gid
= current
->fsgid
;
1516 inode
->i_mode
= mode
;
1517 inode
->i_ino
= objectid
;
1518 inode
->i_blocks
= 0;
1519 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1520 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
1521 struct btrfs_inode_item
);
1522 fill_inode_item(path
->nodes
[0], inode_item
, inode
);
1523 btrfs_mark_buffer_dirty(path
->nodes
[0]);
1524 btrfs_free_path(path
);
1526 location
= &BTRFS_I(inode
)->location
;
1527 location
->objectid
= objectid
;
1528 location
->offset
= 0;
1529 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1531 insert_inode_hash(inode
);
1534 btrfs_free_path(path
);
1535 return ERR_PTR(ret
);
1538 static inline u8
btrfs_inode_type(struct inode
*inode
)
1540 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1543 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1544 struct dentry
*dentry
, struct inode
*inode
)
1547 struct btrfs_key key
;
1548 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1549 struct inode
*parent_inode
;
1551 key
.objectid
= inode
->i_ino
;
1552 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1555 ret
= btrfs_insert_dir_item(trans
, root
,
1556 dentry
->d_name
.name
, dentry
->d_name
.len
,
1557 dentry
->d_parent
->d_inode
->i_ino
,
1558 &key
, btrfs_inode_type(inode
));
1560 ret
= btrfs_insert_inode_ref(trans
, root
,
1561 dentry
->d_name
.name
,
1564 dentry
->d_parent
->d_inode
->i_ino
);
1565 parent_inode
= dentry
->d_parent
->d_inode
;
1566 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1567 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1568 ret
= btrfs_update_inode(trans
, root
,
1569 dentry
->d_parent
->d_inode
);
1574 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1575 struct dentry
*dentry
, struct inode
*inode
)
1577 int err
= btrfs_add_link(trans
, dentry
, inode
);
1579 d_instantiate(dentry
, inode
);
1587 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1588 int mode
, dev_t rdev
)
1590 struct btrfs_trans_handle
*trans
;
1591 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1592 struct inode
*inode
= NULL
;
1596 unsigned long nr
= 0;
1598 if (!new_valid_dev(rdev
))
1601 mutex_lock(&root
->fs_info
->fs_mutex
);
1602 err
= btrfs_check_free_space(root
, 1, 0);
1606 trans
= btrfs_start_transaction(root
, 1);
1607 btrfs_set_trans_block_group(trans
, dir
);
1609 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1615 inode
= btrfs_new_inode(trans
, root
, objectid
,
1616 BTRFS_I(dir
)->block_group
, mode
);
1617 err
= PTR_ERR(inode
);
1621 btrfs_set_trans_block_group(trans
, inode
);
1622 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1626 inode
->i_op
= &btrfs_special_inode_operations
;
1627 init_special_inode(inode
, inode
->i_mode
, rdev
);
1628 btrfs_update_inode(trans
, root
, inode
);
1630 dir
->i_sb
->s_dirt
= 1;
1631 btrfs_update_inode_block_group(trans
, inode
);
1632 btrfs_update_inode_block_group(trans
, dir
);
1634 nr
= trans
->blocks_used
;
1635 btrfs_end_transaction(trans
, root
);
1637 mutex_unlock(&root
->fs_info
->fs_mutex
);
1640 inode_dec_link_count(inode
);
1643 btrfs_btree_balance_dirty(root
, nr
);
1644 btrfs_throttle(root
);
1648 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1649 int mode
, struct nameidata
*nd
)
1651 struct btrfs_trans_handle
*trans
;
1652 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1653 struct inode
*inode
= NULL
;
1656 unsigned long nr
= 0;
1659 mutex_lock(&root
->fs_info
->fs_mutex
);
1660 err
= btrfs_check_free_space(root
, 1, 0);
1663 trans
= btrfs_start_transaction(root
, 1);
1664 btrfs_set_trans_block_group(trans
, dir
);
1666 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1672 inode
= btrfs_new_inode(trans
, root
, objectid
,
1673 BTRFS_I(dir
)->block_group
, mode
);
1674 err
= PTR_ERR(inode
);
1678 btrfs_set_trans_block_group(trans
, inode
);
1679 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1683 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1684 inode
->i_fop
= &btrfs_file_operations
;
1685 inode
->i_op
= &btrfs_file_inode_operations
;
1686 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1687 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1688 inode
->i_mapping
, GFP_NOFS
);
1689 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
1691 dir
->i_sb
->s_dirt
= 1;
1692 btrfs_update_inode_block_group(trans
, inode
);
1693 btrfs_update_inode_block_group(trans
, dir
);
1695 nr
= trans
->blocks_used
;
1696 btrfs_end_transaction(trans
, root
);
1698 mutex_unlock(&root
->fs_info
->fs_mutex
);
1701 inode_dec_link_count(inode
);
1704 btrfs_btree_balance_dirty(root
, nr
);
1705 btrfs_throttle(root
);
1709 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1710 struct dentry
*dentry
)
1712 struct btrfs_trans_handle
*trans
;
1713 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1714 struct inode
*inode
= old_dentry
->d_inode
;
1715 unsigned long nr
= 0;
1719 if (inode
->i_nlink
== 0)
1722 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1727 mutex_lock(&root
->fs_info
->fs_mutex
);
1728 err
= btrfs_check_free_space(root
, 1, 0);
1731 trans
= btrfs_start_transaction(root
, 1);
1733 btrfs_set_trans_block_group(trans
, dir
);
1734 atomic_inc(&inode
->i_count
);
1735 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1740 dir
->i_sb
->s_dirt
= 1;
1741 btrfs_update_inode_block_group(trans
, dir
);
1742 err
= btrfs_update_inode(trans
, root
, inode
);
1747 nr
= trans
->blocks_used
;
1748 btrfs_end_transaction(trans
, root
);
1750 mutex_unlock(&root
->fs_info
->fs_mutex
);
1753 inode_dec_link_count(inode
);
1756 btrfs_btree_balance_dirty(root
, nr
);
1757 btrfs_throttle(root
);
1761 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1763 struct inode
*inode
;
1764 struct btrfs_trans_handle
*trans
;
1765 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1767 int drop_on_err
= 0;
1769 unsigned long nr
= 1;
1771 mutex_lock(&root
->fs_info
->fs_mutex
);
1772 err
= btrfs_check_free_space(root
, 1, 0);
1776 trans
= btrfs_start_transaction(root
, 1);
1777 btrfs_set_trans_block_group(trans
, dir
);
1779 if (IS_ERR(trans
)) {
1780 err
= PTR_ERR(trans
);
1784 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1790 inode
= btrfs_new_inode(trans
, root
, objectid
,
1791 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
1792 if (IS_ERR(inode
)) {
1793 err
= PTR_ERR(inode
);
1798 inode
->i_op
= &btrfs_dir_inode_operations
;
1799 inode
->i_fop
= &btrfs_dir_file_operations
;
1800 btrfs_set_trans_block_group(trans
, inode
);
1803 err
= btrfs_update_inode(trans
, root
, inode
);
1807 err
= btrfs_add_link(trans
, dentry
, inode
);
1811 d_instantiate(dentry
, inode
);
1813 dir
->i_sb
->s_dirt
= 1;
1814 btrfs_update_inode_block_group(trans
, inode
);
1815 btrfs_update_inode_block_group(trans
, dir
);
1818 nr
= trans
->blocks_used
;
1819 btrfs_end_transaction(trans
, root
);
1822 mutex_unlock(&root
->fs_info
->fs_mutex
);
1825 btrfs_btree_balance_dirty(root
, nr
);
1826 btrfs_throttle(root
);
1830 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1831 size_t page_offset
, u64 start
, u64 len
,
1837 u64 extent_start
= 0;
1839 u64 objectid
= inode
->i_ino
;
1841 struct btrfs_path
*path
;
1842 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1843 struct btrfs_file_extent_item
*item
;
1844 struct extent_buffer
*leaf
;
1845 struct btrfs_key found_key
;
1846 struct extent_map
*em
= NULL
;
1847 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1848 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1849 struct btrfs_trans_handle
*trans
= NULL
;
1851 path
= btrfs_alloc_path();
1853 mutex_lock(&root
->fs_info
->fs_mutex
);
1856 spin_lock(&em_tree
->lock
);
1857 em
= lookup_extent_mapping(em_tree
, start
, len
);
1858 spin_unlock(&em_tree
->lock
);
1861 if (em
->start
> start
) {
1862 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
1863 start
, len
, em
->start
, em
->len
);
1868 em
= alloc_extent_map(GFP_NOFS
);
1874 em
->start
= EXTENT_MAP_HOLE
;
1876 em
->bdev
= inode
->i_sb
->s_bdev
;
1877 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
1878 objectid
, start
, trans
!= NULL
);
1885 if (path
->slots
[0] == 0)
1890 leaf
= path
->nodes
[0];
1891 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1892 struct btrfs_file_extent_item
);
1893 /* are we inside the extent that was found? */
1894 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1895 found_type
= btrfs_key_type(&found_key
);
1896 if (found_key
.objectid
!= objectid
||
1897 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
1901 found_type
= btrfs_file_extent_type(leaf
, item
);
1902 extent_start
= found_key
.offset
;
1903 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
1904 extent_end
= extent_start
+
1905 btrfs_file_extent_num_bytes(leaf
, item
);
1907 if (start
< extent_start
|| start
>= extent_end
) {
1909 if (start
< extent_start
) {
1910 if (start
+ len
<= extent_start
)
1912 em
->len
= extent_end
- extent_start
;
1918 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
1920 em
->start
= extent_start
;
1921 em
->len
= extent_end
- extent_start
;
1922 em
->block_start
= EXTENT_MAP_HOLE
;
1925 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
1926 em
->block_start
= bytenr
;
1927 em
->start
= extent_start
;
1928 em
->len
= extent_end
- extent_start
;
1930 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
1934 size_t extent_offset
;
1937 size
= btrfs_file_extent_inline_len(leaf
, btrfs_item_nr(leaf
,
1939 extent_end
= (extent_start
+ size
+ root
->sectorsize
- 1) &
1940 ~((u64
)root
->sectorsize
- 1);
1941 if (start
< extent_start
|| start
>= extent_end
) {
1943 if (start
< extent_start
) {
1944 if (start
+ len
<= extent_start
)
1946 em
->len
= extent_end
- extent_start
;
1952 em
->block_start
= EXTENT_MAP_INLINE
;
1955 em
->start
= extent_start
;
1960 extent_offset
= ((u64
)page
->index
<< PAGE_CACHE_SHIFT
) -
1961 extent_start
+ page_offset
;
1962 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- page_offset
,
1963 size
- extent_offset
);
1964 em
->start
= extent_start
+ extent_offset
;
1965 em
->len
= copy_size
;
1967 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
1968 if (create
== 0 && !PageUptodate(page
)) {
1969 read_extent_buffer(leaf
, map
+ page_offset
, ptr
,
1971 flush_dcache_page(page
);
1972 } else if (create
&& PageUptodate(page
)) {
1975 free_extent_map(em
);
1977 btrfs_release_path(root
, path
);
1978 trans
= btrfs_start_transaction(root
, 1);
1981 write_extent_buffer(leaf
, map
+ page_offset
, ptr
,
1983 btrfs_mark_buffer_dirty(leaf
);
1986 set_extent_uptodate(io_tree
, em
->start
,
1987 extent_map_end(em
) - 1, GFP_NOFS
);
1990 printk("unkknown found_type %d\n", found_type
);
1997 em
->block_start
= EXTENT_MAP_HOLE
;
1999 btrfs_release_path(root
, path
);
2000 if (em
->start
> start
|| extent_map_end(em
) <= start
) {
2001 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->len
, start
, len
);
2007 spin_lock(&em_tree
->lock
);
2008 ret
= add_extent_mapping(em_tree
, em
);
2009 if (ret
== -EEXIST
) {
2010 free_extent_map(em
);
2011 em
= lookup_extent_mapping(em_tree
, start
, len
);
2014 printk("failing to insert %Lu %Lu\n", start
, len
);
2017 spin_unlock(&em_tree
->lock
);
2019 btrfs_free_path(path
);
2021 ret
= btrfs_end_transaction(trans
, root
);
2025 mutex_unlock(&root
->fs_info
->fs_mutex
);
2027 free_extent_map(em
);
2029 return ERR_PTR(err
);
2034 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
2036 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
2039 int btrfs_readpage(struct file
*file
, struct page
*page
)
2041 struct extent_io_tree
*tree
;
2042 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2043 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
2046 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
2048 struct extent_io_tree
*tree
;
2051 if (current
->flags
& PF_MEMALLOC
) {
2052 redirty_page_for_writepage(wbc
, page
);
2056 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2057 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
2060 static int btrfs_writepages(struct address_space
*mapping
,
2061 struct writeback_control
*wbc
)
2063 struct extent_io_tree
*tree
;
2064 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
2065 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
2069 btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
2070 struct list_head
*pages
, unsigned nr_pages
)
2072 struct extent_io_tree
*tree
;
2073 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
2074 return extent_readpages(tree
, mapping
, pages
, nr_pages
,
2078 static int btrfs_releasepage(struct page
*page
, gfp_t unused_gfp_flags
)
2080 struct extent_io_tree
*tree
;
2081 struct extent_map_tree
*map
;
2084 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2085 map
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
2086 ret
= try_release_extent_mapping(map
, tree
, page
);
2088 ClearPagePrivate(page
);
2089 set_page_private(page
, 0);
2090 page_cache_release(page
);
2095 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
2097 struct extent_io_tree
*tree
;
2099 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2100 extent_invalidatepage(tree
, page
, offset
);
2101 btrfs_releasepage(page
, GFP_NOFS
);
2105 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2106 * called from a page fault handler when a page is first dirtied. Hence we must
2107 * be careful to check for EOF conditions here. We set the page up correctly
2108 * for a written page which means we get ENOSPC checking when writing into
2109 * holes and correct delalloc and unwritten extent mapping on filesystems that
2110 * support these features.
2112 * We are not allowed to take the i_mutex here so we have to play games to
2113 * protect against truncate races as the page could now be beyond EOF. Because
2114 * vmtruncate() writes the inode size before removing pages, once we have the
2115 * page lock we can determine safely if the page is beyond EOF. If it is not
2116 * beyond EOF, then the page is guaranteed safe against truncation until we
2119 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
2121 struct inode
*inode
= fdentry(vma
->vm_file
)->d_inode
;
2122 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2128 mutex_lock(&root
->fs_info
->fs_mutex
);
2129 ret
= btrfs_check_free_space(root
, PAGE_CACHE_SIZE
, 0);
2130 mutex_unlock(&root
->fs_info
->fs_mutex
);
2137 wait_on_page_writeback(page
);
2138 size
= i_size_read(inode
);
2139 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2141 if ((page
->mapping
!= inode
->i_mapping
) ||
2142 (page_start
> size
)) {
2143 /* page got truncated out from underneath us */
2147 /* page is wholly or partially inside EOF */
2148 if (page_start
+ PAGE_CACHE_SIZE
> size
)
2149 end
= size
& ~PAGE_CACHE_MASK
;
2151 end
= PAGE_CACHE_SIZE
;
2153 ret
= btrfs_cow_one_page(inode
, page
, end
);
2161 static void btrfs_truncate(struct inode
*inode
)
2163 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2165 struct btrfs_trans_handle
*trans
;
2168 if (!S_ISREG(inode
->i_mode
))
2170 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
2173 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
2175 mutex_lock(&root
->fs_info
->fs_mutex
);
2176 trans
= btrfs_start_transaction(root
, 1);
2177 btrfs_set_trans_block_group(trans
, inode
);
2179 /* FIXME, add redo link to tree so we don't leak on crash */
2180 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
2181 btrfs_update_inode(trans
, root
, inode
);
2182 nr
= trans
->blocks_used
;
2184 ret
= btrfs_end_transaction(trans
, root
);
2186 mutex_unlock(&root
->fs_info
->fs_mutex
);
2187 btrfs_btree_balance_dirty(root
, nr
);
2188 btrfs_throttle(root
);
2191 static int noinline
create_subvol(struct btrfs_root
*root
, char *name
,
2194 struct btrfs_trans_handle
*trans
;
2195 struct btrfs_key key
;
2196 struct btrfs_root_item root_item
;
2197 struct btrfs_inode_item
*inode_item
;
2198 struct extent_buffer
*leaf
;
2199 struct btrfs_root
*new_root
= root
;
2200 struct inode
*inode
;
2205 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
2206 unsigned long nr
= 1;
2208 mutex_lock(&root
->fs_info
->fs_mutex
);
2209 ret
= btrfs_check_free_space(root
, 1, 0);
2213 trans
= btrfs_start_transaction(root
, 1);
2216 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
2221 leaf
= __btrfs_alloc_free_block(trans
, root
, root
->leafsize
,
2222 objectid
, trans
->transid
, 0, 0,
2225 return PTR_ERR(leaf
);
2227 btrfs_set_header_nritems(leaf
, 0);
2228 btrfs_set_header_level(leaf
, 0);
2229 btrfs_set_header_bytenr(leaf
, leaf
->start
);
2230 btrfs_set_header_generation(leaf
, trans
->transid
);
2231 btrfs_set_header_owner(leaf
, objectid
);
2233 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
2234 (unsigned long)btrfs_header_fsid(leaf
),
2236 btrfs_mark_buffer_dirty(leaf
);
2238 inode_item
= &root_item
.inode
;
2239 memset(inode_item
, 0, sizeof(*inode_item
));
2240 inode_item
->generation
= cpu_to_le64(1);
2241 inode_item
->size
= cpu_to_le64(3);
2242 inode_item
->nlink
= cpu_to_le32(1);
2243 inode_item
->nblocks
= cpu_to_le64(1);
2244 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
2246 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
2247 btrfs_set_root_level(&root_item
, 0);
2248 btrfs_set_root_refs(&root_item
, 1);
2249 btrfs_set_root_used(&root_item
, 0);
2251 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
2252 root_item
.drop_level
= 0;
2254 free_extent_buffer(leaf
);
2257 btrfs_set_root_dirid(&root_item
, new_dirid
);
2259 key
.objectid
= objectid
;
2261 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
2262 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
2268 * insert the directory item
2270 key
.offset
= (u64
)-1;
2271 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
2272 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
2273 name
, namelen
, dir
->i_ino
, &key
,
2278 ret
= btrfs_insert_inode_ref(trans
, root
->fs_info
->tree_root
,
2279 name
, namelen
, objectid
,
2280 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
);
2284 ret
= btrfs_commit_transaction(trans
, root
);
2288 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
2291 trans
= btrfs_start_transaction(new_root
, 1);
2294 inode
= btrfs_new_inode(trans
, new_root
, new_dirid
,
2295 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
2298 inode
->i_op
= &btrfs_dir_inode_operations
;
2299 inode
->i_fop
= &btrfs_dir_file_operations
;
2300 new_root
->inode
= inode
;
2302 ret
= btrfs_insert_inode_ref(trans
, new_root
, "..", 2, new_dirid
,
2306 ret
= btrfs_update_inode(trans
, new_root
, inode
);
2310 nr
= trans
->blocks_used
;
2311 err
= btrfs_commit_transaction(trans
, new_root
);
2315 mutex_unlock(&root
->fs_info
->fs_mutex
);
2316 btrfs_btree_balance_dirty(root
, nr
);
2317 btrfs_throttle(root
);
2321 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
2323 struct btrfs_pending_snapshot
*pending_snapshot
;
2324 struct btrfs_trans_handle
*trans
;
2327 unsigned long nr
= 0;
2329 if (!root
->ref_cows
)
2332 mutex_lock(&root
->fs_info
->fs_mutex
);
2333 ret
= btrfs_check_free_space(root
, 1, 0);
2337 pending_snapshot
= kmalloc(sizeof(*pending_snapshot
), GFP_NOFS
);
2338 if (!pending_snapshot
) {
2342 pending_snapshot
->name
= kmalloc(namelen
+ 1, GFP_NOFS
);
2343 if (!pending_snapshot
->name
) {
2345 kfree(pending_snapshot
);
2348 memcpy(pending_snapshot
->name
, name
, namelen
);
2349 pending_snapshot
->name
[namelen
] = '\0';
2350 trans
= btrfs_start_transaction(root
, 1);
2352 pending_snapshot
->root
= root
;
2353 list_add(&pending_snapshot
->list
,
2354 &trans
->transaction
->pending_snapshots
);
2355 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
2356 err
= btrfs_commit_transaction(trans
, root
);
2359 mutex_unlock(&root
->fs_info
->fs_mutex
);
2360 btrfs_btree_balance_dirty(root
, nr
);
2361 btrfs_throttle(root
);
2365 unsigned long btrfs_force_ra(struct address_space
*mapping
,
2366 struct file_ra_state
*ra
, struct file
*file
,
2367 pgoff_t offset
, pgoff_t last_index
)
2371 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2372 req_size
= last_index
- offset
+ 1;
2373 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
2376 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
2377 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
2378 return offset
+ req_size
;
2382 int btrfs_defrag_file(struct file
*file
) {
2383 struct inode
*inode
= fdentry(file
)->d_inode
;
2384 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2385 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2387 unsigned long last_index
;
2388 unsigned long ra_index
= 0;
2392 u64 existing_delalloc
;
2396 mutex_lock(&root
->fs_info
->fs_mutex
);
2397 ret
= btrfs_check_free_space(root
, inode
->i_size
, 0);
2398 mutex_unlock(&root
->fs_info
->fs_mutex
);
2402 mutex_lock(&inode
->i_mutex
);
2403 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
2404 for (i
= 0; i
<= last_index
; i
++) {
2405 if (i
== ra_index
) {
2406 ra_index
= btrfs_force_ra(inode
->i_mapping
,
2408 file
, ra_index
, last_index
);
2410 page
= grab_cache_page(inode
->i_mapping
, i
);
2413 if (!PageUptodate(page
)) {
2414 btrfs_readpage(NULL
, page
);
2416 if (!PageUptodate(page
)) {
2418 page_cache_release(page
);
2422 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2423 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2425 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2426 delalloc_start
= page_start
;
2428 count_range_bits(&BTRFS_I(inode
)->io_tree
,
2429 &delalloc_start
, page_end
,
2430 PAGE_CACHE_SIZE
, EXTENT_DELALLOC
);
2431 set_extent_delalloc(io_tree
, page_start
,
2432 page_end
, GFP_NOFS
);
2434 spin_lock(&root
->fs_info
->delalloc_lock
);
2435 root
->fs_info
->delalloc_bytes
+= PAGE_CACHE_SIZE
-
2437 spin_unlock(&root
->fs_info
->delalloc_lock
);
2439 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2440 set_page_dirty(page
);
2442 page_cache_release(page
);
2443 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
2447 mutex_unlock(&inode
->i_mutex
);
2451 static int btrfs_ioctl_resize(struct btrfs_root
*root
, void __user
*arg
)
2455 struct btrfs_ioctl_vol_args
*vol_args
;
2456 struct btrfs_trans_handle
*trans
;
2462 vol_args
= kmalloc(sizeof(*vol_args
), GFP_NOFS
);
2467 if (copy_from_user(vol_args
, arg
, sizeof(*vol_args
))) {
2471 namelen
= strlen(vol_args
->name
);
2472 if (namelen
> BTRFS_VOL_NAME_MAX
) {
2477 sizestr
= vol_args
->name
;
2478 if (!strcmp(sizestr
, "max"))
2479 new_size
= root
->fs_info
->sb
->s_bdev
->bd_inode
->i_size
;
2481 if (sizestr
[0] == '-') {
2484 } else if (sizestr
[0] == '+') {
2488 new_size
= btrfs_parse_size(sizestr
);
2489 if (new_size
== 0) {
2495 mutex_lock(&root
->fs_info
->fs_mutex
);
2496 old_size
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
2499 if (new_size
> old_size
) {
2503 new_size
= old_size
- new_size
;
2504 } else if (mod
> 0) {
2505 new_size
= old_size
+ new_size
;
2508 if (new_size
< 256 * 1024 * 1024) {
2512 if (new_size
> root
->fs_info
->sb
->s_bdev
->bd_inode
->i_size
) {
2517 do_div(new_size
, root
->sectorsize
);
2518 new_size
*= root
->sectorsize
;
2520 printk("new size is %Lu\n", new_size
);
2521 if (new_size
> old_size
) {
2522 trans
= btrfs_start_transaction(root
, 1);
2523 ret
= btrfs_grow_extent_tree(trans
, root
, new_size
);
2524 btrfs_commit_transaction(trans
, root
);
2526 ret
= btrfs_shrink_extent_tree(root
, new_size
);
2530 mutex_unlock(&root
->fs_info
->fs_mutex
);
2536 static int noinline
btrfs_ioctl_snap_create(struct btrfs_root
*root
,
2539 struct btrfs_ioctl_vol_args
*vol_args
;
2540 struct btrfs_dir_item
*di
;
2541 struct btrfs_path
*path
;
2546 vol_args
= kmalloc(sizeof(*vol_args
), GFP_NOFS
);
2551 if (copy_from_user(vol_args
, arg
, sizeof(*vol_args
))) {
2556 namelen
= strlen(vol_args
->name
);
2557 if (namelen
> BTRFS_VOL_NAME_MAX
) {
2561 if (strchr(vol_args
->name
, '/')) {
2566 path
= btrfs_alloc_path();
2572 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2573 mutex_lock(&root
->fs_info
->fs_mutex
);
2574 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2576 vol_args
->name
, namelen
, 0);
2577 mutex_unlock(&root
->fs_info
->fs_mutex
);
2578 btrfs_free_path(path
);
2580 if (di
&& !IS_ERR(di
)) {
2590 if (root
== root
->fs_info
->tree_root
)
2591 ret
= create_subvol(root
, vol_args
->name
, namelen
);
2593 ret
= create_snapshot(root
, vol_args
->name
, namelen
);
2599 static int btrfs_ioctl_defrag(struct file
*file
)
2601 struct inode
*inode
= fdentry(file
)->d_inode
;
2602 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2604 switch (inode
->i_mode
& S_IFMT
) {
2606 mutex_lock(&root
->fs_info
->fs_mutex
);
2607 btrfs_defrag_root(root
, 0);
2608 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2609 mutex_unlock(&root
->fs_info
->fs_mutex
);
2612 btrfs_defrag_file(file
);
2619 long btrfs_ioctl(struct file
*file
, unsigned int
2620 cmd
, unsigned long arg
)
2622 struct btrfs_root
*root
= BTRFS_I(fdentry(file
)->d_inode
)->root
;
2625 case BTRFS_IOC_SNAP_CREATE
:
2626 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2627 case BTRFS_IOC_DEFRAG
:
2628 return btrfs_ioctl_defrag(file
);
2629 case BTRFS_IOC_RESIZE
:
2630 return btrfs_ioctl_resize(root
, (void __user
*)arg
);
2637 * Called inside transaction, so use GFP_NOFS
2639 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2641 struct btrfs_inode
*ei
;
2643 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2647 ei
->ordered_trans
= 0;
2648 return &ei
->vfs_inode
;
2651 void btrfs_destroy_inode(struct inode
*inode
)
2653 WARN_ON(!list_empty(&inode
->i_dentry
));
2654 WARN_ON(inode
->i_data
.nrpages
);
2656 btrfs_drop_extent_cache(inode
, 0, (u64
)-1);
2657 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2660 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2661 static void init_once(struct kmem_cache
* cachep
, void *foo
)
2663 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2664 unsigned long flags
)
2667 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2669 inode_init_once(&ei
->vfs_inode
);
2672 void btrfs_destroy_cachep(void)
2674 if (btrfs_inode_cachep
)
2675 kmem_cache_destroy(btrfs_inode_cachep
);
2676 if (btrfs_trans_handle_cachep
)
2677 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2678 if (btrfs_transaction_cachep
)
2679 kmem_cache_destroy(btrfs_transaction_cachep
);
2680 if (btrfs_bit_radix_cachep
)
2681 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2682 if (btrfs_path_cachep
)
2683 kmem_cache_destroy(btrfs_path_cachep
);
2686 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2687 unsigned long extra_flags
,
2688 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2689 void (*ctor
)(struct kmem_cache
*, void *)
2691 void (*ctor
)(void *, struct kmem_cache
*,
2696 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2697 SLAB_MEM_SPREAD
| extra_flags
), ctor
2698 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2704 int btrfs_init_cachep(void)
2706 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2707 sizeof(struct btrfs_inode
),
2709 if (!btrfs_inode_cachep
)
2711 btrfs_trans_handle_cachep
=
2712 btrfs_cache_create("btrfs_trans_handle_cache",
2713 sizeof(struct btrfs_trans_handle
),
2715 if (!btrfs_trans_handle_cachep
)
2717 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
2718 sizeof(struct btrfs_transaction
),
2720 if (!btrfs_transaction_cachep
)
2722 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
2723 sizeof(struct btrfs_path
),
2725 if (!btrfs_path_cachep
)
2727 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
2728 SLAB_DESTROY_BY_RCU
, NULL
);
2729 if (!btrfs_bit_radix_cachep
)
2733 btrfs_destroy_cachep();
2737 static int btrfs_getattr(struct vfsmount
*mnt
,
2738 struct dentry
*dentry
, struct kstat
*stat
)
2740 struct inode
*inode
= dentry
->d_inode
;
2741 generic_fillattr(inode
, stat
);
2742 stat
->blksize
= PAGE_CACHE_SIZE
;
2746 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
2747 struct inode
* new_dir
,struct dentry
*new_dentry
)
2749 struct btrfs_trans_handle
*trans
;
2750 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
2751 struct inode
*new_inode
= new_dentry
->d_inode
;
2752 struct inode
*old_inode
= old_dentry
->d_inode
;
2753 struct timespec ctime
= CURRENT_TIME
;
2754 struct btrfs_path
*path
;
2757 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
2758 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
2762 mutex_lock(&root
->fs_info
->fs_mutex
);
2763 ret
= btrfs_check_free_space(root
, 1, 0);
2767 trans
= btrfs_start_transaction(root
, 1);
2769 btrfs_set_trans_block_group(trans
, new_dir
);
2770 path
= btrfs_alloc_path();
2776 old_dentry
->d_inode
->i_nlink
++;
2777 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
2778 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
2779 old_inode
->i_ctime
= ctime
;
2781 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
2786 new_inode
->i_ctime
= CURRENT_TIME
;
2787 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
2791 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
);
2796 btrfs_free_path(path
);
2797 btrfs_end_transaction(trans
, root
);
2799 mutex_unlock(&root
->fs_info
->fs_mutex
);
2803 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
2804 const char *symname
)
2806 struct btrfs_trans_handle
*trans
;
2807 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2808 struct btrfs_path
*path
;
2809 struct btrfs_key key
;
2810 struct inode
*inode
= NULL
;
2817 struct btrfs_file_extent_item
*ei
;
2818 struct extent_buffer
*leaf
;
2819 unsigned long nr
= 0;
2821 name_len
= strlen(symname
) + 1;
2822 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
2823 return -ENAMETOOLONG
;
2825 mutex_lock(&root
->fs_info
->fs_mutex
);
2826 err
= btrfs_check_free_space(root
, 1, 0);
2830 trans
= btrfs_start_transaction(root
, 1);
2831 btrfs_set_trans_block_group(trans
, dir
);
2833 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2839 inode
= btrfs_new_inode(trans
, root
, objectid
,
2840 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
2841 err
= PTR_ERR(inode
);
2845 btrfs_set_trans_block_group(trans
, inode
);
2846 err
= btrfs_add_nondir(trans
, dentry
, inode
);
2850 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2851 inode
->i_fop
= &btrfs_file_operations
;
2852 inode
->i_op
= &btrfs_file_inode_operations
;
2853 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
2854 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
2855 inode
->i_mapping
, GFP_NOFS
);
2856 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
2858 dir
->i_sb
->s_dirt
= 1;
2859 btrfs_update_inode_block_group(trans
, inode
);
2860 btrfs_update_inode_block_group(trans
, dir
);
2864 path
= btrfs_alloc_path();
2866 key
.objectid
= inode
->i_ino
;
2868 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2869 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
2870 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2876 leaf
= path
->nodes
[0];
2877 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
2878 struct btrfs_file_extent_item
);
2879 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
2880 btrfs_set_file_extent_type(leaf
, ei
,
2881 BTRFS_FILE_EXTENT_INLINE
);
2882 ptr
= btrfs_file_extent_inline_start(ei
);
2883 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
2884 btrfs_mark_buffer_dirty(leaf
);
2885 btrfs_free_path(path
);
2887 inode
->i_op
= &btrfs_symlink_inode_operations
;
2888 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2889 inode
->i_size
= name_len
- 1;
2890 err
= btrfs_update_inode(trans
, root
, inode
);
2895 nr
= trans
->blocks_used
;
2896 btrfs_end_transaction(trans
, root
);
2898 mutex_unlock(&root
->fs_info
->fs_mutex
);
2900 inode_dec_link_count(inode
);
2903 btrfs_btree_balance_dirty(root
, nr
);
2904 btrfs_throttle(root
);
2907 static int btrfs_permission(struct inode
*inode
, int mask
,
2908 struct nameidata
*nd
)
2910 if (btrfs_test_flag(inode
, READONLY
) && (mask
& MAY_WRITE
))
2912 return generic_permission(inode
, mask
, NULL
);
2915 static struct inode_operations btrfs_dir_inode_operations
= {
2916 .lookup
= btrfs_lookup
,
2917 .create
= btrfs_create
,
2918 .unlink
= btrfs_unlink
,
2920 .mkdir
= btrfs_mkdir
,
2921 .rmdir
= btrfs_rmdir
,
2922 .rename
= btrfs_rename
,
2923 .symlink
= btrfs_symlink
,
2924 .setattr
= btrfs_setattr
,
2925 .mknod
= btrfs_mknod
,
2926 .setxattr
= generic_setxattr
,
2927 .getxattr
= generic_getxattr
,
2928 .listxattr
= btrfs_listxattr
,
2929 .removexattr
= generic_removexattr
,
2930 .permission
= btrfs_permission
,
2932 static struct inode_operations btrfs_dir_ro_inode_operations
= {
2933 .lookup
= btrfs_lookup
,
2934 .permission
= btrfs_permission
,
2936 static struct file_operations btrfs_dir_file_operations
= {
2937 .llseek
= generic_file_llseek
,
2938 .read
= generic_read_dir
,
2939 .readdir
= btrfs_readdir
,
2940 .unlocked_ioctl
= btrfs_ioctl
,
2941 #ifdef CONFIG_COMPAT
2942 .compat_ioctl
= btrfs_ioctl
,
2946 static struct extent_io_ops btrfs_extent_io_ops
= {
2947 .fill_delalloc
= run_delalloc_range
,
2948 .writepage_io_hook
= btrfs_writepage_io_hook
,
2949 .readpage_io_hook
= btrfs_readpage_io_hook
,
2950 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
2953 static struct address_space_operations btrfs_aops
= {
2954 .readpage
= btrfs_readpage
,
2955 .writepage
= btrfs_writepage
,
2956 .writepages
= btrfs_writepages
,
2957 .readpages
= btrfs_readpages
,
2958 .sync_page
= block_sync_page
,
2960 .invalidatepage
= btrfs_invalidatepage
,
2961 .releasepage
= btrfs_releasepage
,
2962 .set_page_dirty
= __set_page_dirty_nobuffers
,
2965 static struct address_space_operations btrfs_symlink_aops
= {
2966 .readpage
= btrfs_readpage
,
2967 .writepage
= btrfs_writepage
,
2968 .invalidatepage
= btrfs_invalidatepage
,
2969 .releasepage
= btrfs_releasepage
,
2972 static struct inode_operations btrfs_file_inode_operations
= {
2973 .truncate
= btrfs_truncate
,
2974 .getattr
= btrfs_getattr
,
2975 .setattr
= btrfs_setattr
,
2976 .setxattr
= generic_setxattr
,
2977 .getxattr
= generic_getxattr
,
2978 .listxattr
= btrfs_listxattr
,
2979 .removexattr
= generic_removexattr
,
2980 .permission
= btrfs_permission
,
2982 static struct inode_operations btrfs_special_inode_operations
= {
2983 .getattr
= btrfs_getattr
,
2984 .setattr
= btrfs_setattr
,
2985 .permission
= btrfs_permission
,
2987 static struct inode_operations btrfs_symlink_inode_operations
= {
2988 .readlink
= generic_readlink
,
2989 .follow_link
= page_follow_link_light
,
2990 .put_link
= page_put_link
,
2991 .permission
= btrfs_permission
,