2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/bio.h>
20 #include <linux/buffer_head.h>
22 #include <linux/pagemap.h>
23 #include <linux/highmem.h>
24 #include <linux/time.h>
25 #include <linux/init.h>
26 #include <linux/string.h>
27 #include <linux/smp_lock.h>
28 #include <linux/backing-dev.h>
29 #include <linux/mpage.h>
30 #include <linux/swap.h>
31 #include <linux/writeback.h>
32 #include <linux/statfs.h>
33 #include <linux/compat.h>
34 #include <linux/bit_spinlock.h>
35 #include <linux/version.h>
36 #include <linux/xattr.h>
39 #include "transaction.h"
40 #include "btrfs_inode.h"
42 #include "print-tree.h"
45 struct btrfs_iget_args
{
47 struct btrfs_root
*root
;
50 static struct inode_operations btrfs_dir_inode_operations
;
51 static struct inode_operations btrfs_symlink_inode_operations
;
52 static struct inode_operations btrfs_dir_ro_inode_operations
;
53 static struct inode_operations btrfs_special_inode_operations
;
54 static struct inode_operations btrfs_file_inode_operations
;
55 static struct address_space_operations btrfs_aops
;
56 static struct address_space_operations btrfs_symlink_aops
;
57 static struct file_operations btrfs_dir_file_operations
;
58 static struct extent_io_ops btrfs_extent_io_ops
;
60 static struct kmem_cache
*btrfs_inode_cachep
;
61 struct kmem_cache
*btrfs_trans_handle_cachep
;
62 struct kmem_cache
*btrfs_transaction_cachep
;
63 struct kmem_cache
*btrfs_bit_radix_cachep
;
64 struct kmem_cache
*btrfs_path_cachep
;
67 static unsigned char btrfs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
68 [S_IFREG
>> S_SHIFT
] = BTRFS_FT_REG_FILE
,
69 [S_IFDIR
>> S_SHIFT
] = BTRFS_FT_DIR
,
70 [S_IFCHR
>> S_SHIFT
] = BTRFS_FT_CHRDEV
,
71 [S_IFBLK
>> S_SHIFT
] = BTRFS_FT_BLKDEV
,
72 [S_IFIFO
>> S_SHIFT
] = BTRFS_FT_FIFO
,
73 [S_IFSOCK
>> S_SHIFT
] = BTRFS_FT_SOCK
,
74 [S_IFLNK
>> S_SHIFT
] = BTRFS_FT_SYMLINK
,
77 int btrfs_check_free_space(struct btrfs_root
*root
, u64 num_required
,
80 u64 total
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
81 u64 used
= btrfs_super_bytes_used(&root
->fs_info
->super_copy
);
92 spin_lock(&root
->fs_info
->delalloc_lock
);
93 if (used
+ root
->fs_info
->delalloc_bytes
+ num_required
> thresh
)
95 spin_unlock(&root
->fs_info
->delalloc_lock
);
99 static int cow_file_range(struct inode
*inode
, u64 start
, u64 end
)
101 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
102 struct btrfs_trans_handle
*trans
;
106 u64 blocksize
= root
->sectorsize
;
107 u64 orig_start
= start
;
109 struct btrfs_key ins
;
112 trans
= btrfs_start_transaction(root
, 1);
114 btrfs_set_trans_block_group(trans
, inode
);
116 num_bytes
= (end
- start
+ blocksize
) & ~(blocksize
- 1);
117 num_bytes
= max(blocksize
, num_bytes
);
118 ret
= btrfs_drop_extents(trans
, root
, inode
,
119 start
, start
+ num_bytes
, start
, &alloc_hint
);
120 orig_num_bytes
= num_bytes
;
122 if (alloc_hint
== EXTENT_MAP_INLINE
)
125 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 inode
->i_blocks
+= ins
.offset
>> 9;
140 btrfs_check_file(root
, inode
);
141 num_bytes
-= cur_alloc_size
;
142 alloc_hint
= ins
.objectid
+ ins
.offset
;
143 start
+= cur_alloc_size
;
145 btrfs_drop_extent_cache(inode
, orig_start
,
146 orig_start
+ orig_num_bytes
- 1);
147 btrfs_add_ordered_inode(inode
);
148 btrfs_update_inode(trans
, root
, inode
);
150 btrfs_end_transaction(trans
, root
);
154 static int run_delalloc_nocow(struct inode
*inode
, u64 start
, u64 end
)
162 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
163 struct extent_buffer
*leaf
;
165 struct btrfs_path
*path
;
166 struct btrfs_file_extent_item
*item
;
169 struct btrfs_key found_key
;
171 total_fs_bytes
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
172 path
= btrfs_alloc_path();
175 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
176 inode
->i_ino
, start
, 0);
178 btrfs_free_path(path
);
184 if (path
->slots
[0] == 0)
189 leaf
= path
->nodes
[0];
190 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
191 struct btrfs_file_extent_item
);
193 /* are we inside the extent that was found? */
194 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
195 found_type
= btrfs_key_type(&found_key
);
196 if (found_key
.objectid
!= inode
->i_ino
||
197 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
201 found_type
= btrfs_file_extent_type(leaf
, item
);
202 extent_start
= found_key
.offset
;
203 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
204 u64 extent_num_bytes
;
206 extent_num_bytes
= btrfs_file_extent_num_bytes(leaf
, item
);
207 extent_end
= extent_start
+ extent_num_bytes
;
210 if (loops
&& start
!= extent_start
)
213 if (start
< extent_start
|| start
>= extent_end
)
216 cow_end
= min(end
, extent_end
- 1);
217 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
222 * we may be called by the resizer, make sure we're inside
223 * the limits of the FS
225 if (bytenr
+ extent_num_bytes
> total_fs_bytes
)
228 if (btrfs_count_snapshots_in_path(root
, path
, bytenr
) != 1) {
238 btrfs_free_path(path
);
241 btrfs_release_path(root
, path
);
246 cow_file_range(inode
, start
, cow_end
);
251 static int run_delalloc_range(struct inode
*inode
, u64 start
, u64 end
)
253 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
255 mutex_lock(&root
->fs_info
->fs_mutex
);
256 if (btrfs_test_opt(root
, NODATACOW
) ||
257 btrfs_test_flag(inode
, NODATACOW
))
258 ret
= run_delalloc_nocow(inode
, start
, end
);
260 ret
= cow_file_range(inode
, start
, end
);
262 mutex_unlock(&root
->fs_info
->fs_mutex
);
266 int btrfs_set_bit_hook(struct inode
*inode
, u64 start
, u64 end
,
267 unsigned long old
, unsigned long bits
)
269 if (!(old
& EXTENT_DELALLOC
) && (bits
& EXTENT_DELALLOC
)) {
270 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
271 spin_lock(&root
->fs_info
->delalloc_lock
);
272 BTRFS_I(inode
)->delalloc_bytes
+= end
- start
+ 1;
273 root
->fs_info
->delalloc_bytes
+= end
- start
+ 1;
274 spin_unlock(&root
->fs_info
->delalloc_lock
);
279 int btrfs_clear_bit_hook(struct inode
*inode
, u64 start
, u64 end
,
280 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(&root
->fs_info
->delalloc_lock
);
285 if (end
- start
+ 1 > root
->fs_info
->delalloc_bytes
) {
286 printk("warning: delalloc account %Lu %Lu\n",
287 end
- start
+ 1, root
->fs_info
->delalloc_bytes
);
288 root
->fs_info
->delalloc_bytes
= 0;
289 BTRFS_I(inode
)->delalloc_bytes
= 0;
291 root
->fs_info
->delalloc_bytes
-= end
- start
+ 1;
292 BTRFS_I(inode
)->delalloc_bytes
-= end
- start
+ 1;
294 spin_unlock(&root
->fs_info
->delalloc_lock
);
299 int btrfs_merge_bio_hook(struct page
*page
, unsigned long offset
,
300 size_t size
, struct bio
*bio
)
302 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
303 struct btrfs_mapping_tree
*map_tree
;
304 u64 logical
= bio
->bi_sector
<< 9;
307 struct bio_vec
*bvec
;
311 bio_for_each_segment(bvec
, bio
, i
) {
312 length
+= bvec
->bv_len
;
314 map_tree
= &root
->fs_info
->mapping_tree
;
316 ret
= btrfs_map_block(map_tree
, READ
, logical
,
319 if (map_length
< length
+ size
) {
325 int btrfs_submit_bio_hook(struct inode
*inode
, int rw
, struct bio
*bio
)
327 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
328 struct btrfs_trans_handle
*trans
;
335 if (btrfs_test_opt(root
, NODATASUM
) ||
336 btrfs_test_flag(inode
, NODATASUM
)) {
340 mutex_lock(&root
->fs_info
->fs_mutex
);
341 trans
= btrfs_start_transaction(root
, 1);
342 btrfs_set_trans_block_group(trans
, inode
);
343 btrfs_csum_file_blocks(trans
, root
, inode
, bio
);
344 ret
= btrfs_end_transaction(trans
, root
);
346 mutex_unlock(&root
->fs_info
->fs_mutex
);
348 return btrfs_map_bio(root
, rw
, bio
);
351 int btrfs_readpage_io_hook(struct page
*page
, u64 start
, u64 end
)
354 struct inode
*inode
= page
->mapping
->host
;
355 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
356 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
357 struct btrfs_csum_item
*item
;
358 struct btrfs_path
*path
= NULL
;
360 if (btrfs_test_opt(root
, NODATASUM
) ||
361 btrfs_test_flag(inode
, NODATASUM
))
363 mutex_lock(&root
->fs_info
->fs_mutex
);
364 path
= btrfs_alloc_path();
365 item
= btrfs_lookup_csum(NULL
, root
, path
, inode
->i_ino
, start
, 0);
368 /* a csum that isn't present is a preallocated region. */
369 if (ret
== -ENOENT
|| ret
== -EFBIG
)
372 printk("no csum found for inode %lu start %Lu\n", inode
->i_ino
, start
);
375 read_extent_buffer(path
->nodes
[0], &csum
, (unsigned long)item
,
377 set_state_private(io_tree
, start
, csum
);
380 btrfs_free_path(path
);
381 mutex_unlock(&root
->fs_info
->fs_mutex
);
385 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
,
386 struct extent_state
*state
)
388 size_t offset
= start
- ((u64
)page
->index
<< PAGE_CACHE_SHIFT
);
389 struct inode
*inode
= page
->mapping
->host
;
390 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
392 u64
private = ~(u32
)0;
394 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
398 if (btrfs_test_opt(root
, NODATASUM
) ||
399 btrfs_test_flag(inode
, NODATASUM
))
401 if (state
&& state
->start
== start
) {
402 private = state
->private;
405 ret
= get_state_private(io_tree
, start
, &private);
407 local_irq_save(flags
);
408 kaddr
= kmap_atomic(page
, KM_IRQ0
);
412 csum
= btrfs_csum_data(root
, kaddr
+ offset
, csum
, end
- start
+ 1);
413 btrfs_csum_final(csum
, (char *)&csum
);
414 if (csum
!= private) {
417 kunmap_atomic(kaddr
, KM_IRQ0
);
418 local_irq_restore(flags
);
422 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
423 page
->mapping
->host
->i_ino
, (unsigned long long)start
, csum
,
425 memset(kaddr
+ offset
, 1, end
- start
+ 1);
426 flush_dcache_page(page
);
427 kunmap_atomic(kaddr
, KM_IRQ0
);
428 local_irq_restore(flags
);
432 void btrfs_read_locked_inode(struct inode
*inode
)
434 struct btrfs_path
*path
;
435 struct extent_buffer
*leaf
;
436 struct btrfs_inode_item
*inode_item
;
437 struct btrfs_timespec
*tspec
;
438 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
439 struct btrfs_key location
;
440 u64 alloc_group_block
;
444 path
= btrfs_alloc_path();
446 mutex_lock(&root
->fs_info
->fs_mutex
);
447 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
449 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
453 leaf
= path
->nodes
[0];
454 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
455 struct btrfs_inode_item
);
457 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
458 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
459 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
460 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
461 inode
->i_size
= btrfs_inode_size(leaf
, inode_item
);
463 tspec
= btrfs_inode_atime(inode_item
);
464 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
465 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
467 tspec
= btrfs_inode_mtime(inode_item
);
468 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
469 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
471 tspec
= btrfs_inode_ctime(inode_item
);
472 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
473 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
475 inode
->i_blocks
= btrfs_inode_nblocks(leaf
, inode_item
);
476 inode
->i_generation
= btrfs_inode_generation(leaf
, inode_item
);
478 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
480 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
481 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
483 BTRFS_I(inode
)->flags
= btrfs_inode_flags(leaf
, inode_item
);
484 if (!BTRFS_I(inode
)->block_group
) {
485 BTRFS_I(inode
)->block_group
= btrfs_find_block_group(root
,
487 BTRFS_BLOCK_GROUP_METADATA
, 0);
489 btrfs_free_path(path
);
492 mutex_unlock(&root
->fs_info
->fs_mutex
);
494 switch (inode
->i_mode
& S_IFMT
) {
496 inode
->i_mapping
->a_ops
= &btrfs_aops
;
497 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
498 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
499 inode
->i_fop
= &btrfs_file_operations
;
500 inode
->i_op
= &btrfs_file_inode_operations
;
503 inode
->i_fop
= &btrfs_dir_file_operations
;
504 if (root
== root
->fs_info
->tree_root
)
505 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
507 inode
->i_op
= &btrfs_dir_inode_operations
;
510 inode
->i_op
= &btrfs_symlink_inode_operations
;
511 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
512 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
515 init_special_inode(inode
, inode
->i_mode
, rdev
);
521 btrfs_release_path(root
, path
);
522 btrfs_free_path(path
);
523 mutex_unlock(&root
->fs_info
->fs_mutex
);
524 make_bad_inode(inode
);
527 static void fill_inode_item(struct extent_buffer
*leaf
,
528 struct btrfs_inode_item
*item
,
531 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
532 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
533 btrfs_set_inode_size(leaf
, item
, inode
->i_size
);
534 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
535 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
537 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
538 inode
->i_atime
.tv_sec
);
539 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
540 inode
->i_atime
.tv_nsec
);
542 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
543 inode
->i_mtime
.tv_sec
);
544 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
545 inode
->i_mtime
.tv_nsec
);
547 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
548 inode
->i_ctime
.tv_sec
);
549 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
550 inode
->i_ctime
.tv_nsec
);
552 btrfs_set_inode_nblocks(leaf
, item
, inode
->i_blocks
);
553 btrfs_set_inode_generation(leaf
, item
, inode
->i_generation
);
554 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
555 btrfs_set_inode_flags(leaf
, item
, BTRFS_I(inode
)->flags
);
556 btrfs_set_inode_block_group(leaf
, item
,
557 BTRFS_I(inode
)->block_group
->key
.objectid
);
560 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
561 struct btrfs_root
*root
,
564 struct btrfs_inode_item
*inode_item
;
565 struct btrfs_path
*path
;
566 struct extent_buffer
*leaf
;
569 path
= btrfs_alloc_path();
571 ret
= btrfs_lookup_inode(trans
, root
, path
,
572 &BTRFS_I(inode
)->location
, 1);
579 leaf
= path
->nodes
[0];
580 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
581 struct btrfs_inode_item
);
583 fill_inode_item(leaf
, inode_item
, inode
);
584 btrfs_mark_buffer_dirty(leaf
);
585 btrfs_set_inode_last_trans(trans
, inode
);
588 btrfs_release_path(root
, path
);
589 btrfs_free_path(path
);
594 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
595 struct btrfs_root
*root
,
597 struct dentry
*dentry
)
599 struct btrfs_path
*path
;
600 const char *name
= dentry
->d_name
.name
;
601 int name_len
= dentry
->d_name
.len
;
603 struct extent_buffer
*leaf
;
604 struct btrfs_dir_item
*di
;
605 struct btrfs_key key
;
607 path
= btrfs_alloc_path();
613 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
623 leaf
= path
->nodes
[0];
624 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
625 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
628 btrfs_release_path(root
, path
);
630 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
631 key
.objectid
, name
, name_len
, -1);
640 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
642 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
643 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
644 dentry
->d_inode
->i_ino
,
645 dentry
->d_parent
->d_inode
->i_ino
);
647 printk("failed to delete reference to %.*s, "
648 "inode %lu parent %lu\n", name_len
, name
,
649 dentry
->d_inode
->i_ino
,
650 dentry
->d_parent
->d_inode
->i_ino
);
653 btrfs_free_path(path
);
655 dir
->i_size
-= name_len
* 2;
656 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
657 btrfs_update_inode(trans
, root
, dir
);
658 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
659 dentry
->d_inode
->i_nlink
--;
661 drop_nlink(dentry
->d_inode
);
663 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
664 dir
->i_sb
->s_dirt
= 1;
669 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
671 struct btrfs_root
*root
;
672 struct btrfs_trans_handle
*trans
;
673 struct inode
*inode
= dentry
->d_inode
;
675 unsigned long nr
= 0;
677 root
= BTRFS_I(dir
)->root
;
678 mutex_lock(&root
->fs_info
->fs_mutex
);
680 ret
= btrfs_check_free_space(root
, 1, 1);
684 trans
= btrfs_start_transaction(root
, 1);
686 btrfs_set_trans_block_group(trans
, dir
);
687 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
688 nr
= trans
->blocks_used
;
690 if (inode
->i_nlink
== 0) {
692 /* if the inode isn't linked anywhere,
693 * we don't need to worry about
696 found
= btrfs_del_ordered_inode(inode
);
698 atomic_dec(&inode
->i_count
);
702 btrfs_end_transaction(trans
, root
);
704 mutex_unlock(&root
->fs_info
->fs_mutex
);
705 btrfs_btree_balance_dirty(root
, nr
);
706 btrfs_throttle(root
);
710 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
712 struct inode
*inode
= dentry
->d_inode
;
715 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
716 struct btrfs_trans_handle
*trans
;
717 unsigned long nr
= 0;
719 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
722 mutex_lock(&root
->fs_info
->fs_mutex
);
723 ret
= btrfs_check_free_space(root
, 1, 1);
727 trans
= btrfs_start_transaction(root
, 1);
728 btrfs_set_trans_block_group(trans
, dir
);
730 /* now the directory is empty */
731 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
736 nr
= trans
->blocks_used
;
737 ret
= btrfs_end_transaction(trans
, root
);
739 mutex_unlock(&root
->fs_info
->fs_mutex
);
740 btrfs_btree_balance_dirty(root
, nr
);
741 btrfs_throttle(root
);
749 * this can truncate away extent items, csum items and directory items.
750 * It starts at a high offset and removes keys until it can't find
751 * any higher than i_size.
753 * csum items that cross the new i_size are truncated to the new size
756 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
757 struct btrfs_root
*root
,
762 struct btrfs_path
*path
;
763 struct btrfs_key key
;
764 struct btrfs_key found_key
;
766 struct extent_buffer
*leaf
;
767 struct btrfs_file_extent_item
*fi
;
768 u64 extent_start
= 0;
769 u64 extent_num_bytes
= 0;
775 int pending_del_nr
= 0;
776 int pending_del_slot
= 0;
777 int extent_type
= -1;
779 btrfs_drop_extent_cache(inode
, inode
->i_size
, (u64
)-1);
780 path
= btrfs_alloc_path();
784 /* FIXME, add redo link to tree so we don't leak on crash */
785 key
.objectid
= inode
->i_ino
;
786 key
.offset
= (u64
)-1;
789 btrfs_init_path(path
);
791 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
796 BUG_ON(path
->slots
[0] == 0);
802 leaf
= path
->nodes
[0];
803 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
804 found_type
= btrfs_key_type(&found_key
);
806 if (found_key
.objectid
!= inode
->i_ino
)
809 if (found_type
< min_type
)
812 item_end
= found_key
.offset
;
813 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
814 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
815 struct btrfs_file_extent_item
);
816 extent_type
= btrfs_file_extent_type(leaf
, fi
);
817 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
819 btrfs_file_extent_num_bytes(leaf
, fi
);
820 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
821 struct btrfs_item
*item
= btrfs_item_nr(leaf
,
823 item_end
+= btrfs_file_extent_inline_len(leaf
,
828 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
829 ret
= btrfs_csum_truncate(trans
, root
, path
,
833 if (item_end
< inode
->i_size
) {
834 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
835 found_type
= BTRFS_INODE_ITEM_KEY
;
836 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
837 found_type
= BTRFS_CSUM_ITEM_KEY
;
838 } else if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
839 found_type
= BTRFS_XATTR_ITEM_KEY
;
840 } else if (found_type
== BTRFS_XATTR_ITEM_KEY
) {
841 found_type
= BTRFS_INODE_REF_KEY
;
842 } else if (found_type
) {
847 btrfs_set_key_type(&key
, found_type
);
850 if (found_key
.offset
>= inode
->i_size
)
856 /* FIXME, shrink the extent if the ref count is only 1 */
857 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
860 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
862 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
865 btrfs_file_extent_num_bytes(leaf
, fi
);
866 extent_num_bytes
= inode
->i_size
-
867 found_key
.offset
+ root
->sectorsize
- 1;
868 extent_num_bytes
= extent_num_bytes
&
869 ~((u64
)root
->sectorsize
- 1);
870 btrfs_set_file_extent_num_bytes(leaf
, fi
,
872 num_dec
= (orig_num_bytes
-
874 if (extent_start
!= 0)
875 dec_i_blocks(inode
, num_dec
);
876 btrfs_mark_buffer_dirty(leaf
);
879 btrfs_file_extent_disk_num_bytes(leaf
,
881 /* FIXME blocksize != 4096 */
882 num_dec
= btrfs_file_extent_num_bytes(leaf
, fi
);
883 if (extent_start
!= 0) {
885 dec_i_blocks(inode
, num_dec
);
887 root_gen
= btrfs_header_generation(leaf
);
888 root_owner
= btrfs_header_owner(leaf
);
890 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
892 u32 newsize
= inode
->i_size
- found_key
.offset
;
893 dec_i_blocks(inode
, item_end
+ 1 -
894 found_key
.offset
- newsize
);
896 btrfs_file_extent_calc_inline_size(newsize
);
897 ret
= btrfs_truncate_item(trans
, root
, path
,
901 dec_i_blocks(inode
, item_end
+ 1 -
907 if (!pending_del_nr
) {
908 /* no pending yet, add ourselves */
909 pending_del_slot
= path
->slots
[0];
911 } else if (pending_del_nr
&&
912 path
->slots
[0] + 1 == pending_del_slot
) {
913 /* hop on the pending chunk */
915 pending_del_slot
= path
->slots
[0];
917 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path
->slots
[0], pending_del_nr
, pending_del_slot
);
923 ret
= btrfs_free_extent(trans
, root
, extent_start
,
926 root_gen
, inode
->i_ino
,
927 found_key
.offset
, 0);
931 if (path
->slots
[0] == 0) {
934 btrfs_release_path(root
, path
);
939 if (pending_del_nr
&&
940 path
->slots
[0] + 1 != pending_del_slot
) {
941 struct btrfs_key debug
;
943 btrfs_item_key_to_cpu(path
->nodes
[0], &debug
,
945 ret
= btrfs_del_items(trans
, root
, path
,
950 btrfs_release_path(root
, path
);
956 if (pending_del_nr
) {
957 ret
= btrfs_del_items(trans
, root
, path
, pending_del_slot
,
960 btrfs_release_path(root
, path
);
961 btrfs_free_path(path
);
962 inode
->i_sb
->s_dirt
= 1;
966 static int btrfs_cow_one_page(struct inode
*inode
, struct page
*page
,
970 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
971 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
972 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
975 WARN_ON(!PageLocked(page
));
976 set_page_extent_mapped(page
);
978 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
979 set_extent_delalloc(&BTRFS_I(inode
)->io_tree
, page_start
,
982 if (zero_start
!= PAGE_CACHE_SIZE
) {
984 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
985 flush_dcache_page(page
);
988 set_page_dirty(page
);
989 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
995 * taken from block_truncate_page, but does cow as it zeros out
996 * any bytes left in the last page in the file.
998 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
1000 struct inode
*inode
= mapping
->host
;
1001 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1002 u32 blocksize
= root
->sectorsize
;
1003 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
1004 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
1009 if ((offset
& (blocksize
- 1)) == 0)
1013 page
= grab_cache_page(mapping
, index
);
1016 if (!PageUptodate(page
)) {
1017 ret
= btrfs_readpage(NULL
, page
);
1019 if (!PageUptodate(page
)) {
1024 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
1026 ret
= btrfs_cow_one_page(inode
, page
, offset
);
1029 page_cache_release(page
);
1034 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
1036 struct inode
*inode
= dentry
->d_inode
;
1039 err
= inode_change_ok(inode
, attr
);
1043 if (S_ISREG(inode
->i_mode
) &&
1044 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
1045 struct btrfs_trans_handle
*trans
;
1046 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1047 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1049 u64 mask
= root
->sectorsize
- 1;
1050 u64 hole_start
= (inode
->i_size
+ mask
) & ~mask
;
1051 u64 block_end
= (attr
->ia_size
+ mask
) & ~mask
;
1055 if (attr
->ia_size
<= hole_start
)
1058 mutex_lock(&root
->fs_info
->fs_mutex
);
1059 err
= btrfs_check_free_space(root
, 1, 0);
1060 mutex_unlock(&root
->fs_info
->fs_mutex
);
1064 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
1066 lock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
1067 hole_size
= block_end
- hole_start
;
1069 mutex_lock(&root
->fs_info
->fs_mutex
);
1070 trans
= btrfs_start_transaction(root
, 1);
1071 btrfs_set_trans_block_group(trans
, inode
);
1072 err
= btrfs_drop_extents(trans
, root
, inode
,
1073 hole_start
, block_end
, hole_start
,
1076 if (alloc_hint
!= EXTENT_MAP_INLINE
) {
1077 err
= btrfs_insert_file_extent(trans
, root
,
1081 btrfs_drop_extent_cache(inode
, hole_start
,
1083 btrfs_check_file(root
, inode
);
1085 btrfs_end_transaction(trans
, root
);
1086 mutex_unlock(&root
->fs_info
->fs_mutex
);
1087 unlock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
1092 err
= inode_setattr(inode
, attr
);
1097 void btrfs_put_inode(struct inode
*inode
)
1101 if (!BTRFS_I(inode
)->ordered_trans
) {
1105 if (mapping_tagged(inode
->i_mapping
, PAGECACHE_TAG_DIRTY
) ||
1106 mapping_tagged(inode
->i_mapping
, PAGECACHE_TAG_WRITEBACK
))
1109 ret
= btrfs_del_ordered_inode(inode
);
1111 atomic_dec(&inode
->i_count
);
1115 void btrfs_delete_inode(struct inode
*inode
)
1117 struct btrfs_trans_handle
*trans
;
1118 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1122 truncate_inode_pages(&inode
->i_data
, 0);
1123 if (is_bad_inode(inode
)) {
1128 mutex_lock(&root
->fs_info
->fs_mutex
);
1129 trans
= btrfs_start_transaction(root
, 1);
1131 btrfs_set_trans_block_group(trans
, inode
);
1132 ret
= btrfs_truncate_in_trans(trans
, root
, inode
, 0);
1134 goto no_delete_lock
;
1136 nr
= trans
->blocks_used
;
1139 btrfs_end_transaction(trans
, root
);
1140 mutex_unlock(&root
->fs_info
->fs_mutex
);
1141 btrfs_btree_balance_dirty(root
, nr
);
1142 btrfs_throttle(root
);
1146 nr
= trans
->blocks_used
;
1147 btrfs_end_transaction(trans
, root
);
1148 mutex_unlock(&root
->fs_info
->fs_mutex
);
1149 btrfs_btree_balance_dirty(root
, nr
);
1150 btrfs_throttle(root
);
1156 * this returns the key found in the dir entry in the location pointer.
1157 * If no dir entries were found, location->objectid is 0.
1159 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
1160 struct btrfs_key
*location
)
1162 const char *name
= dentry
->d_name
.name
;
1163 int namelen
= dentry
->d_name
.len
;
1164 struct btrfs_dir_item
*di
;
1165 struct btrfs_path
*path
;
1166 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1169 if (namelen
== 1 && strcmp(name
, ".") == 0) {
1170 location
->objectid
= dir
->i_ino
;
1171 location
->type
= BTRFS_INODE_ITEM_KEY
;
1172 location
->offset
= 0;
1175 path
= btrfs_alloc_path();
1178 if (namelen
== 2 && strcmp(name
, "..") == 0) {
1179 struct btrfs_key key
;
1180 struct extent_buffer
*leaf
;
1184 key
.objectid
= dir
->i_ino
;
1185 btrfs_set_key_type(&key
, BTRFS_INODE_REF_KEY
);
1187 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1191 leaf
= path
->nodes
[0];
1192 slot
= path
->slots
[0];
1193 nritems
= btrfs_header_nritems(leaf
);
1194 if (slot
>= nritems
)
1197 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
1198 if (key
.objectid
!= dir
->i_ino
||
1199 key
.type
!= BTRFS_INODE_REF_KEY
) {
1202 location
->objectid
= key
.offset
;
1203 location
->type
= BTRFS_INODE_ITEM_KEY
;
1204 location
->offset
= 0;
1208 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
1212 if (!di
|| IS_ERR(di
)) {
1215 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
1217 btrfs_free_path(path
);
1220 location
->objectid
= 0;
1225 * when we hit a tree root in a directory, the btrfs part of the inode
1226 * needs to be changed to reflect the root directory of the tree root. This
1227 * is kind of like crossing a mount point.
1229 static int fixup_tree_root_location(struct btrfs_root
*root
,
1230 struct btrfs_key
*location
,
1231 struct btrfs_root
**sub_root
,
1232 struct dentry
*dentry
)
1234 struct btrfs_path
*path
;
1235 struct btrfs_root_item
*ri
;
1237 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
1239 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
1242 path
= btrfs_alloc_path();
1244 mutex_lock(&root
->fs_info
->fs_mutex
);
1246 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
1247 dentry
->d_name
.name
,
1248 dentry
->d_name
.len
);
1249 if (IS_ERR(*sub_root
))
1250 return PTR_ERR(*sub_root
);
1252 ri
= &(*sub_root
)->root_item
;
1253 location
->objectid
= btrfs_root_dirid(ri
);
1254 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1255 location
->offset
= 0;
1257 btrfs_free_path(path
);
1258 mutex_unlock(&root
->fs_info
->fs_mutex
);
1262 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
1264 struct btrfs_iget_args
*args
= p
;
1265 inode
->i_ino
= args
->ino
;
1266 BTRFS_I(inode
)->root
= args
->root
;
1267 BTRFS_I(inode
)->delalloc_bytes
= 0;
1268 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1269 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1270 inode
->i_mapping
, GFP_NOFS
);
1274 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
1276 struct btrfs_iget_args
*args
= opaque
;
1277 return (args
->ino
== inode
->i_ino
&&
1278 args
->root
== BTRFS_I(inode
)->root
);
1281 struct inode
*btrfs_ilookup(struct super_block
*s
, u64 objectid
,
1284 struct btrfs_iget_args args
;
1285 args
.ino
= objectid
;
1286 args
.root
= btrfs_lookup_fs_root(btrfs_sb(s
)->fs_info
, root_objectid
);
1291 return ilookup5(s
, objectid
, btrfs_find_actor
, (void *)&args
);
1294 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1295 struct btrfs_root
*root
)
1297 struct inode
*inode
;
1298 struct btrfs_iget_args args
;
1299 args
.ino
= objectid
;
1302 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
1303 btrfs_init_locked_inode
,
1308 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
1309 struct nameidata
*nd
)
1311 struct inode
* inode
;
1312 struct btrfs_inode
*bi
= BTRFS_I(dir
);
1313 struct btrfs_root
*root
= bi
->root
;
1314 struct btrfs_root
*sub_root
= root
;
1315 struct btrfs_key location
;
1318 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
1319 return ERR_PTR(-ENAMETOOLONG
);
1321 mutex_lock(&root
->fs_info
->fs_mutex
);
1322 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
1323 mutex_unlock(&root
->fs_info
->fs_mutex
);
1326 return ERR_PTR(ret
);
1329 if (location
.objectid
) {
1330 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
1333 return ERR_PTR(ret
);
1335 return ERR_PTR(-ENOENT
);
1336 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
1339 return ERR_PTR(-EACCES
);
1340 if (inode
->i_state
& I_NEW
) {
1341 /* the inode and parent dir are two different roots */
1342 if (sub_root
!= root
) {
1344 sub_root
->inode
= inode
;
1346 BTRFS_I(inode
)->root
= sub_root
;
1347 memcpy(&BTRFS_I(inode
)->location
, &location
,
1349 btrfs_read_locked_inode(inode
);
1350 unlock_new_inode(inode
);
1353 return d_splice_alias(inode
, dentry
);
1356 static unsigned char btrfs_filetype_table
[] = {
1357 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
1360 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
1362 struct inode
*inode
= filp
->f_dentry
->d_inode
;
1363 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1364 struct btrfs_item
*item
;
1365 struct btrfs_dir_item
*di
;
1366 struct btrfs_key key
;
1367 struct btrfs_key found_key
;
1368 struct btrfs_path
*path
;
1371 struct extent_buffer
*leaf
;
1374 unsigned char d_type
;
1379 int key_type
= BTRFS_DIR_INDEX_KEY
;
1384 /* FIXME, use a real flag for deciding about the key type */
1385 if (root
->fs_info
->tree_root
== root
)
1386 key_type
= BTRFS_DIR_ITEM_KEY
;
1388 /* special case for "." */
1389 if (filp
->f_pos
== 0) {
1390 over
= filldir(dirent
, ".", 1,
1398 mutex_lock(&root
->fs_info
->fs_mutex
);
1399 key
.objectid
= inode
->i_ino
;
1400 path
= btrfs_alloc_path();
1403 /* special case for .., just use the back ref */
1404 if (filp
->f_pos
== 1) {
1405 btrfs_set_key_type(&key
, BTRFS_INODE_REF_KEY
);
1407 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1409 leaf
= path
->nodes
[0];
1410 slot
= path
->slots
[0];
1411 nritems
= btrfs_header_nritems(leaf
);
1412 if (slot
>= nritems
) {
1413 btrfs_release_path(root
, path
);
1414 goto read_dir_items
;
1416 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1417 btrfs_release_path(root
, path
);
1418 if (found_key
.objectid
!= key
.objectid
||
1419 found_key
.type
!= BTRFS_INODE_REF_KEY
)
1420 goto read_dir_items
;
1421 over
= filldir(dirent
, "..", 2,
1422 2, found_key
.offset
, DT_DIR
);
1429 btrfs_set_key_type(&key
, key_type
);
1430 key
.offset
= filp
->f_pos
;
1432 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1437 leaf
= path
->nodes
[0];
1438 nritems
= btrfs_header_nritems(leaf
);
1439 slot
= path
->slots
[0];
1440 if (advance
|| slot
>= nritems
) {
1441 if (slot
>= nritems
-1) {
1442 ret
= btrfs_next_leaf(root
, path
);
1445 leaf
= path
->nodes
[0];
1446 nritems
= btrfs_header_nritems(leaf
);
1447 slot
= path
->slots
[0];
1454 item
= btrfs_item_nr(leaf
, slot
);
1455 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1457 if (found_key
.objectid
!= key
.objectid
)
1459 if (btrfs_key_type(&found_key
) != key_type
)
1461 if (found_key
.offset
< filp
->f_pos
)
1464 filp
->f_pos
= found_key
.offset
;
1466 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1468 di_total
= btrfs_item_size(leaf
, item
);
1469 while(di_cur
< di_total
) {
1470 struct btrfs_key location
;
1472 name_len
= btrfs_dir_name_len(leaf
, di
);
1473 if (name_len
< 32) {
1474 name_ptr
= tmp_name
;
1476 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
1479 read_extent_buffer(leaf
, name_ptr
,
1480 (unsigned long)(di
+ 1), name_len
);
1482 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
1483 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
1484 over
= filldir(dirent
, name_ptr
, name_len
,
1489 if (name_ptr
!= tmp_name
)
1494 di_len
= btrfs_dir_name_len(leaf
, di
) +
1495 btrfs_dir_data_len(leaf
, di
) +sizeof(*di
);
1497 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1500 if (key_type
== BTRFS_DIR_INDEX_KEY
)
1501 filp
->f_pos
= INT_LIMIT(typeof(filp
->f_pos
));
1507 btrfs_release_path(root
, path
);
1508 btrfs_free_path(path
);
1509 mutex_unlock(&root
->fs_info
->fs_mutex
);
1513 int btrfs_write_inode(struct inode
*inode
, int wait
)
1515 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1516 struct btrfs_trans_handle
*trans
;
1520 mutex_lock(&root
->fs_info
->fs_mutex
);
1521 trans
= btrfs_start_transaction(root
, 1);
1522 btrfs_set_trans_block_group(trans
, inode
);
1523 ret
= btrfs_commit_transaction(trans
, root
);
1524 mutex_unlock(&root
->fs_info
->fs_mutex
);
1530 * This is somewhat expensive, updating the tree every time the
1531 * inode changes. But, it is most likely to find the inode in cache.
1532 * FIXME, needs more benchmarking...there are no reasons other than performance
1533 * to keep or drop this code.
1535 void btrfs_dirty_inode(struct inode
*inode
)
1537 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1538 struct btrfs_trans_handle
*trans
;
1540 mutex_lock(&root
->fs_info
->fs_mutex
);
1541 trans
= btrfs_start_transaction(root
, 1);
1542 btrfs_set_trans_block_group(trans
, inode
);
1543 btrfs_update_inode(trans
, root
, inode
);
1544 btrfs_end_transaction(trans
, root
);
1545 mutex_unlock(&root
->fs_info
->fs_mutex
);
1548 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1549 struct btrfs_root
*root
,
1550 const char *name
, int name_len
,
1553 struct btrfs_block_group_cache
*group
,
1556 struct inode
*inode
;
1557 struct btrfs_inode_item
*inode_item
;
1558 struct btrfs_block_group_cache
*new_inode_group
;
1559 struct btrfs_key
*location
;
1560 struct btrfs_path
*path
;
1561 struct btrfs_inode_ref
*ref
;
1562 struct btrfs_key key
[2];
1568 path
= btrfs_alloc_path();
1571 inode
= new_inode(root
->fs_info
->sb
);
1573 return ERR_PTR(-ENOMEM
);
1575 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1576 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1577 inode
->i_mapping
, GFP_NOFS
);
1578 BTRFS_I(inode
)->delalloc_bytes
= 0;
1579 BTRFS_I(inode
)->root
= root
;
1585 new_inode_group
= btrfs_find_block_group(root
, group
, 0,
1586 BTRFS_BLOCK_GROUP_METADATA
, owner
);
1587 if (!new_inode_group
) {
1588 printk("find_block group failed\n");
1589 new_inode_group
= group
;
1591 BTRFS_I(inode
)->block_group
= new_inode_group
;
1592 BTRFS_I(inode
)->flags
= 0;
1594 key
[0].objectid
= objectid
;
1595 btrfs_set_key_type(&key
[0], BTRFS_INODE_ITEM_KEY
);
1598 key
[1].objectid
= objectid
;
1599 btrfs_set_key_type(&key
[1], BTRFS_INODE_REF_KEY
);
1600 key
[1].offset
= ref_objectid
;
1602 sizes
[0] = sizeof(struct btrfs_inode_item
);
1603 sizes
[1] = name_len
+ sizeof(*ref
);
1605 ret
= btrfs_insert_empty_items(trans
, root
, path
, key
, sizes
, 2);
1609 if (objectid
> root
->highest_inode
)
1610 root
->highest_inode
= objectid
;
1612 inode
->i_uid
= current
->fsuid
;
1613 inode
->i_gid
= current
->fsgid
;
1614 inode
->i_mode
= mode
;
1615 inode
->i_ino
= objectid
;
1616 inode
->i_blocks
= 0;
1617 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1618 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
1619 struct btrfs_inode_item
);
1620 fill_inode_item(path
->nodes
[0], inode_item
, inode
);
1622 ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0] + 1,
1623 struct btrfs_inode_ref
);
1624 btrfs_set_inode_ref_name_len(path
->nodes
[0], ref
, name_len
);
1625 ptr
= (unsigned long)(ref
+ 1);
1626 write_extent_buffer(path
->nodes
[0], name
, ptr
, name_len
);
1628 btrfs_mark_buffer_dirty(path
->nodes
[0]);
1629 btrfs_free_path(path
);
1631 location
= &BTRFS_I(inode
)->location
;
1632 location
->objectid
= objectid
;
1633 location
->offset
= 0;
1634 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1636 insert_inode_hash(inode
);
1639 btrfs_free_path(path
);
1640 return ERR_PTR(ret
);
1643 static inline u8
btrfs_inode_type(struct inode
*inode
)
1645 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1648 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1649 struct dentry
*dentry
, struct inode
*inode
,
1653 struct btrfs_key key
;
1654 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1655 struct inode
*parent_inode
;
1657 key
.objectid
= inode
->i_ino
;
1658 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1661 ret
= btrfs_insert_dir_item(trans
, root
,
1662 dentry
->d_name
.name
, dentry
->d_name
.len
,
1663 dentry
->d_parent
->d_inode
->i_ino
,
1664 &key
, btrfs_inode_type(inode
));
1667 ret
= btrfs_insert_inode_ref(trans
, root
,
1668 dentry
->d_name
.name
,
1671 dentry
->d_parent
->d_inode
->i_ino
);
1673 parent_inode
= dentry
->d_parent
->d_inode
;
1674 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1675 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1676 ret
= btrfs_update_inode(trans
, root
,
1677 dentry
->d_parent
->d_inode
);
1682 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1683 struct dentry
*dentry
, struct inode
*inode
,
1686 int err
= btrfs_add_link(trans
, dentry
, inode
, backref
);
1688 d_instantiate(dentry
, inode
);
1696 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1697 int mode
, dev_t rdev
)
1699 struct btrfs_trans_handle
*trans
;
1700 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1701 struct inode
*inode
= NULL
;
1705 unsigned long nr
= 0;
1707 if (!new_valid_dev(rdev
))
1710 mutex_lock(&root
->fs_info
->fs_mutex
);
1711 err
= btrfs_check_free_space(root
, 1, 0);
1715 trans
= btrfs_start_transaction(root
, 1);
1716 btrfs_set_trans_block_group(trans
, dir
);
1718 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1724 inode
= btrfs_new_inode(trans
, root
, dentry
->d_name
.name
,
1726 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
1727 BTRFS_I(dir
)->block_group
, mode
);
1728 err
= PTR_ERR(inode
);
1732 btrfs_set_trans_block_group(trans
, inode
);
1733 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0);
1737 inode
->i_op
= &btrfs_special_inode_operations
;
1738 init_special_inode(inode
, inode
->i_mode
, rdev
);
1739 btrfs_update_inode(trans
, root
, inode
);
1741 dir
->i_sb
->s_dirt
= 1;
1742 btrfs_update_inode_block_group(trans
, inode
);
1743 btrfs_update_inode_block_group(trans
, dir
);
1745 nr
= trans
->blocks_used
;
1746 btrfs_end_transaction(trans
, root
);
1748 mutex_unlock(&root
->fs_info
->fs_mutex
);
1751 inode_dec_link_count(inode
);
1754 btrfs_btree_balance_dirty(root
, nr
);
1755 btrfs_throttle(root
);
1759 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1760 int mode
, struct nameidata
*nd
)
1762 struct btrfs_trans_handle
*trans
;
1763 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1764 struct inode
*inode
= NULL
;
1767 unsigned long nr
= 0;
1770 mutex_lock(&root
->fs_info
->fs_mutex
);
1771 err
= btrfs_check_free_space(root
, 1, 0);
1774 trans
= btrfs_start_transaction(root
, 1);
1775 btrfs_set_trans_block_group(trans
, dir
);
1777 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1783 inode
= btrfs_new_inode(trans
, root
, dentry
->d_name
.name
,
1785 dentry
->d_parent
->d_inode
->i_ino
,
1786 objectid
, BTRFS_I(dir
)->block_group
, mode
);
1787 err
= PTR_ERR(inode
);
1791 btrfs_set_trans_block_group(trans
, inode
);
1792 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0);
1796 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1797 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
1798 inode
->i_fop
= &btrfs_file_operations
;
1799 inode
->i_op
= &btrfs_file_inode_operations
;
1800 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1801 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1802 inode
->i_mapping
, GFP_NOFS
);
1803 BTRFS_I(inode
)->delalloc_bytes
= 0;
1804 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
1806 dir
->i_sb
->s_dirt
= 1;
1807 btrfs_update_inode_block_group(trans
, inode
);
1808 btrfs_update_inode_block_group(trans
, dir
);
1810 nr
= trans
->blocks_used
;
1811 btrfs_end_transaction(trans
, root
);
1813 mutex_unlock(&root
->fs_info
->fs_mutex
);
1816 inode_dec_link_count(inode
);
1819 btrfs_btree_balance_dirty(root
, nr
);
1820 btrfs_throttle(root
);
1824 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1825 struct dentry
*dentry
)
1827 struct btrfs_trans_handle
*trans
;
1828 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1829 struct inode
*inode
= old_dentry
->d_inode
;
1830 unsigned long nr
= 0;
1834 if (inode
->i_nlink
== 0)
1837 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1842 mutex_lock(&root
->fs_info
->fs_mutex
);
1843 err
= btrfs_check_free_space(root
, 1, 0);
1846 trans
= btrfs_start_transaction(root
, 1);
1848 btrfs_set_trans_block_group(trans
, dir
);
1849 atomic_inc(&inode
->i_count
);
1850 err
= btrfs_add_nondir(trans
, dentry
, inode
, 1);
1855 dir
->i_sb
->s_dirt
= 1;
1856 btrfs_update_inode_block_group(trans
, dir
);
1857 err
= btrfs_update_inode(trans
, root
, inode
);
1862 nr
= trans
->blocks_used
;
1863 btrfs_end_transaction(trans
, root
);
1865 mutex_unlock(&root
->fs_info
->fs_mutex
);
1868 inode_dec_link_count(inode
);
1871 btrfs_btree_balance_dirty(root
, nr
);
1872 btrfs_throttle(root
);
1876 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1878 struct inode
*inode
;
1879 struct btrfs_trans_handle
*trans
;
1880 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1882 int drop_on_err
= 0;
1884 unsigned long nr
= 1;
1886 mutex_lock(&root
->fs_info
->fs_mutex
);
1887 err
= btrfs_check_free_space(root
, 1, 0);
1891 trans
= btrfs_start_transaction(root
, 1);
1892 btrfs_set_trans_block_group(trans
, dir
);
1894 if (IS_ERR(trans
)) {
1895 err
= PTR_ERR(trans
);
1899 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1905 inode
= btrfs_new_inode(trans
, root
, dentry
->d_name
.name
,
1907 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
1908 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
1909 if (IS_ERR(inode
)) {
1910 err
= PTR_ERR(inode
);
1915 inode
->i_op
= &btrfs_dir_inode_operations
;
1916 inode
->i_fop
= &btrfs_dir_file_operations
;
1917 btrfs_set_trans_block_group(trans
, inode
);
1920 err
= btrfs_update_inode(trans
, root
, inode
);
1924 err
= btrfs_add_link(trans
, dentry
, inode
, 0);
1928 d_instantiate(dentry
, inode
);
1930 dir
->i_sb
->s_dirt
= 1;
1931 btrfs_update_inode_block_group(trans
, inode
);
1932 btrfs_update_inode_block_group(trans
, dir
);
1935 nr
= trans
->blocks_used
;
1936 btrfs_end_transaction(trans
, root
);
1939 mutex_unlock(&root
->fs_info
->fs_mutex
);
1942 btrfs_btree_balance_dirty(root
, nr
);
1943 btrfs_throttle(root
);
1947 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1948 size_t pg_offset
, u64 start
, u64 len
,
1954 u64 extent_start
= 0;
1956 u64 objectid
= inode
->i_ino
;
1958 struct btrfs_path
*path
;
1959 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1960 struct btrfs_file_extent_item
*item
;
1961 struct extent_buffer
*leaf
;
1962 struct btrfs_key found_key
;
1963 struct extent_map
*em
= NULL
;
1964 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1965 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1966 struct btrfs_trans_handle
*trans
= NULL
;
1968 path
= btrfs_alloc_path();
1970 mutex_lock(&root
->fs_info
->fs_mutex
);
1973 spin_lock(&em_tree
->lock
);
1974 em
= lookup_extent_mapping(em_tree
, start
, len
);
1975 spin_unlock(&em_tree
->lock
);
1978 if (em
->start
> start
) {
1979 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
1980 start
, len
, em
->start
, em
->len
);
1983 if (em
->block_start
== EXTENT_MAP_INLINE
&& page
)
1984 free_extent_map(em
);
1988 em
= alloc_extent_map(GFP_NOFS
);
1994 em
->start
= EXTENT_MAP_HOLE
;
1996 em
->bdev
= inode
->i_sb
->s_bdev
;
1997 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
1998 objectid
, start
, trans
!= NULL
);
2005 if (path
->slots
[0] == 0)
2010 leaf
= path
->nodes
[0];
2011 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2012 struct btrfs_file_extent_item
);
2013 /* are we inside the extent that was found? */
2014 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
2015 found_type
= btrfs_key_type(&found_key
);
2016 if (found_key
.objectid
!= objectid
||
2017 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
2021 found_type
= btrfs_file_extent_type(leaf
, item
);
2022 extent_start
= found_key
.offset
;
2023 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
2024 extent_end
= extent_start
+
2025 btrfs_file_extent_num_bytes(leaf
, item
);
2027 if (start
< extent_start
|| start
>= extent_end
) {
2029 if (start
< extent_start
) {
2030 if (start
+ len
<= extent_start
)
2032 em
->len
= extent_end
- extent_start
;
2038 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
2040 em
->start
= extent_start
;
2041 em
->len
= extent_end
- extent_start
;
2042 em
->block_start
= EXTENT_MAP_HOLE
;
2045 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
2046 em
->block_start
= bytenr
;
2047 em
->start
= extent_start
;
2048 em
->len
= extent_end
- extent_start
;
2050 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
2055 size_t extent_offset
;
2058 size
= btrfs_file_extent_inline_len(leaf
, btrfs_item_nr(leaf
,
2060 extent_end
= (extent_start
+ size
+ root
->sectorsize
- 1) &
2061 ~((u64
)root
->sectorsize
- 1);
2062 if (start
< extent_start
|| start
>= extent_end
) {
2064 if (start
< extent_start
) {
2065 if (start
+ len
<= extent_start
)
2067 em
->len
= extent_end
- extent_start
;
2073 em
->block_start
= EXTENT_MAP_INLINE
;
2076 em
->start
= extent_start
;
2081 page_start
= page_offset(page
) + pg_offset
;
2082 extent_offset
= page_start
- extent_start
;
2083 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- pg_offset
,
2084 size
- extent_offset
);
2085 em
->start
= extent_start
+ extent_offset
;
2086 em
->len
= (copy_size
+ root
->sectorsize
- 1) &
2087 ~((u64
)root
->sectorsize
- 1);
2089 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
2090 if (create
== 0 && !PageUptodate(page
)) {
2091 read_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
2093 flush_dcache_page(page
);
2094 } else if (create
&& PageUptodate(page
)) {
2097 free_extent_map(em
);
2099 btrfs_release_path(root
, path
);
2100 trans
= btrfs_start_transaction(root
, 1);
2103 write_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
2105 btrfs_mark_buffer_dirty(leaf
);
2108 set_extent_uptodate(io_tree
, em
->start
,
2109 extent_map_end(em
) - 1, GFP_NOFS
);
2112 printk("unkknown found_type %d\n", found_type
);
2119 em
->block_start
= EXTENT_MAP_HOLE
;
2121 btrfs_release_path(root
, path
);
2122 if (em
->start
> start
|| extent_map_end(em
) <= start
) {
2123 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->len
, start
, len
);
2129 spin_lock(&em_tree
->lock
);
2130 ret
= add_extent_mapping(em_tree
, em
);
2131 if (ret
== -EEXIST
) {
2132 free_extent_map(em
);
2133 em
= lookup_extent_mapping(em_tree
, start
, len
);
2136 printk("failing to insert %Lu %Lu\n", start
, len
);
2139 spin_unlock(&em_tree
->lock
);
2141 btrfs_free_path(path
);
2143 ret
= btrfs_end_transaction(trans
, root
);
2147 mutex_unlock(&root
->fs_info
->fs_mutex
);
2149 free_extent_map(em
);
2151 return ERR_PTR(err
);
2156 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
2158 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
2161 int btrfs_readpage(struct file
*file
, struct page
*page
)
2163 struct extent_io_tree
*tree
;
2164 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2165 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
2168 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
2170 struct extent_io_tree
*tree
;
2173 if (current
->flags
& PF_MEMALLOC
) {
2174 redirty_page_for_writepage(wbc
, page
);
2178 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2179 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
2182 static int btrfs_writepages(struct address_space
*mapping
,
2183 struct writeback_control
*wbc
)
2185 struct extent_io_tree
*tree
;
2186 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
2187 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
2191 btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
2192 struct list_head
*pages
, unsigned nr_pages
)
2194 struct extent_io_tree
*tree
;
2195 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
2196 return extent_readpages(tree
, mapping
, pages
, nr_pages
,
2200 static int btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
2202 struct extent_io_tree
*tree
;
2203 struct extent_map_tree
*map
;
2206 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2207 map
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
2208 ret
= try_release_extent_mapping(map
, tree
, page
, gfp_flags
);
2210 ClearPagePrivate(page
);
2211 set_page_private(page
, 0);
2212 page_cache_release(page
);
2217 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
2219 struct extent_io_tree
*tree
;
2221 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2222 extent_invalidatepage(tree
, page
, offset
);
2223 btrfs_releasepage(page
, GFP_NOFS
);
2227 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2228 * called from a page fault handler when a page is first dirtied. Hence we must
2229 * be careful to check for EOF conditions here. We set the page up correctly
2230 * for a written page which means we get ENOSPC checking when writing into
2231 * holes and correct delalloc and unwritten extent mapping on filesystems that
2232 * support these features.
2234 * We are not allowed to take the i_mutex here so we have to play games to
2235 * protect against truncate races as the page could now be beyond EOF. Because
2236 * vmtruncate() writes the inode size before removing pages, once we have the
2237 * page lock we can determine safely if the page is beyond EOF. If it is not
2238 * beyond EOF, then the page is guaranteed safe against truncation until we
2241 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
2243 struct inode
*inode
= fdentry(vma
->vm_file
)->d_inode
;
2244 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2250 mutex_lock(&root
->fs_info
->fs_mutex
);
2251 ret
= btrfs_check_free_space(root
, PAGE_CACHE_SIZE
, 0);
2252 mutex_unlock(&root
->fs_info
->fs_mutex
);
2259 wait_on_page_writeback(page
);
2260 size
= i_size_read(inode
);
2261 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2263 if ((page
->mapping
!= inode
->i_mapping
) ||
2264 (page_start
> size
)) {
2265 /* page got truncated out from underneath us */
2269 /* page is wholly or partially inside EOF */
2270 if (page_start
+ PAGE_CACHE_SIZE
> size
)
2271 end
= size
& ~PAGE_CACHE_MASK
;
2273 end
= PAGE_CACHE_SIZE
;
2275 ret
= btrfs_cow_one_page(inode
, page
, end
);
2283 static void btrfs_truncate(struct inode
*inode
)
2285 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2287 struct btrfs_trans_handle
*trans
;
2290 if (!S_ISREG(inode
->i_mode
))
2292 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
2295 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
2297 mutex_lock(&root
->fs_info
->fs_mutex
);
2298 trans
= btrfs_start_transaction(root
, 1);
2299 btrfs_set_trans_block_group(trans
, inode
);
2301 /* FIXME, add redo link to tree so we don't leak on crash */
2302 ret
= btrfs_truncate_in_trans(trans
, root
, inode
,
2303 BTRFS_EXTENT_DATA_KEY
);
2304 btrfs_update_inode(trans
, root
, inode
);
2305 nr
= trans
->blocks_used
;
2307 ret
= btrfs_end_transaction(trans
, root
);
2309 mutex_unlock(&root
->fs_info
->fs_mutex
);
2310 btrfs_btree_balance_dirty(root
, nr
);
2311 btrfs_throttle(root
);
2314 static int noinline
create_subvol(struct btrfs_root
*root
, char *name
,
2317 struct btrfs_trans_handle
*trans
;
2318 struct btrfs_key key
;
2319 struct btrfs_root_item root_item
;
2320 struct btrfs_inode_item
*inode_item
;
2321 struct extent_buffer
*leaf
;
2322 struct btrfs_root
*new_root
= root
;
2323 struct inode
*inode
;
2328 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
2329 unsigned long nr
= 1;
2331 mutex_lock(&root
->fs_info
->fs_mutex
);
2332 ret
= btrfs_check_free_space(root
, 1, 0);
2336 trans
= btrfs_start_transaction(root
, 1);
2339 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
2344 leaf
= __btrfs_alloc_free_block(trans
, root
, root
->leafsize
,
2345 objectid
, trans
->transid
, 0, 0,
2348 return PTR_ERR(leaf
);
2350 btrfs_set_header_nritems(leaf
, 0);
2351 btrfs_set_header_level(leaf
, 0);
2352 btrfs_set_header_bytenr(leaf
, leaf
->start
);
2353 btrfs_set_header_generation(leaf
, trans
->transid
);
2354 btrfs_set_header_owner(leaf
, objectid
);
2356 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
2357 (unsigned long)btrfs_header_fsid(leaf
),
2359 btrfs_mark_buffer_dirty(leaf
);
2361 inode_item
= &root_item
.inode
;
2362 memset(inode_item
, 0, sizeof(*inode_item
));
2363 inode_item
->generation
= cpu_to_le64(1);
2364 inode_item
->size
= cpu_to_le64(3);
2365 inode_item
->nlink
= cpu_to_le32(1);
2366 inode_item
->nblocks
= cpu_to_le64(1);
2367 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
2369 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
2370 btrfs_set_root_level(&root_item
, 0);
2371 btrfs_set_root_refs(&root_item
, 1);
2372 btrfs_set_root_used(&root_item
, 0);
2374 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
2375 root_item
.drop_level
= 0;
2377 free_extent_buffer(leaf
);
2380 btrfs_set_root_dirid(&root_item
, new_dirid
);
2382 key
.objectid
= objectid
;
2384 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
2385 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
2391 * insert the directory item
2393 key
.offset
= (u64
)-1;
2394 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
2395 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
2396 name
, namelen
, dir
->i_ino
, &key
,
2401 ret
= btrfs_insert_inode_ref(trans
, root
->fs_info
->tree_root
,
2402 name
, namelen
, objectid
,
2403 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
);
2407 ret
= btrfs_commit_transaction(trans
, root
);
2411 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
2414 trans
= btrfs_start_transaction(new_root
, 1);
2417 inode
= btrfs_new_inode(trans
, new_root
, "..", 2, new_dirid
,
2419 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
2422 inode
->i_op
= &btrfs_dir_inode_operations
;
2423 inode
->i_fop
= &btrfs_dir_file_operations
;
2424 new_root
->inode
= inode
;
2426 ret
= btrfs_insert_inode_ref(trans
, new_root
, "..", 2, new_dirid
,
2430 ret
= btrfs_update_inode(trans
, new_root
, inode
);
2434 nr
= trans
->blocks_used
;
2435 err
= btrfs_commit_transaction(trans
, new_root
);
2439 mutex_unlock(&root
->fs_info
->fs_mutex
);
2440 btrfs_btree_balance_dirty(root
, nr
);
2441 btrfs_throttle(root
);
2445 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
2447 struct btrfs_pending_snapshot
*pending_snapshot
;
2448 struct btrfs_trans_handle
*trans
;
2451 unsigned long nr
= 0;
2453 if (!root
->ref_cows
)
2456 mutex_lock(&root
->fs_info
->fs_mutex
);
2457 ret
= btrfs_check_free_space(root
, 1, 0);
2461 pending_snapshot
= kmalloc(sizeof(*pending_snapshot
), GFP_NOFS
);
2462 if (!pending_snapshot
) {
2466 pending_snapshot
->name
= kmalloc(namelen
+ 1, GFP_NOFS
);
2467 if (!pending_snapshot
->name
) {
2469 kfree(pending_snapshot
);
2472 memcpy(pending_snapshot
->name
, name
, namelen
);
2473 pending_snapshot
->name
[namelen
] = '\0';
2474 trans
= btrfs_start_transaction(root
, 1);
2476 pending_snapshot
->root
= root
;
2477 list_add(&pending_snapshot
->list
,
2478 &trans
->transaction
->pending_snapshots
);
2479 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
2480 err
= btrfs_commit_transaction(trans
, root
);
2483 mutex_unlock(&root
->fs_info
->fs_mutex
);
2484 btrfs_btree_balance_dirty(root
, nr
);
2485 btrfs_throttle(root
);
2489 unsigned long btrfs_force_ra(struct address_space
*mapping
,
2490 struct file_ra_state
*ra
, struct file
*file
,
2491 pgoff_t offset
, pgoff_t last_index
)
2495 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2496 req_size
= last_index
- offset
+ 1;
2497 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
2500 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
2501 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
2502 return offset
+ req_size
;
2506 int btrfs_defrag_file(struct file
*file
) {
2507 struct inode
*inode
= fdentry(file
)->d_inode
;
2508 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2509 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2511 unsigned long last_index
;
2512 unsigned long ra_index
= 0;
2518 mutex_lock(&root
->fs_info
->fs_mutex
);
2519 ret
= btrfs_check_free_space(root
, inode
->i_size
, 0);
2520 mutex_unlock(&root
->fs_info
->fs_mutex
);
2524 mutex_lock(&inode
->i_mutex
);
2525 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
2526 for (i
= 0; i
<= last_index
; i
++) {
2527 if (i
== ra_index
) {
2528 ra_index
= btrfs_force_ra(inode
->i_mapping
,
2530 file
, ra_index
, last_index
);
2532 page
= grab_cache_page(inode
->i_mapping
, i
);
2535 if (!PageUptodate(page
)) {
2536 btrfs_readpage(NULL
, page
);
2538 if (!PageUptodate(page
)) {
2540 page_cache_release(page
);
2544 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2545 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2547 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2548 set_extent_delalloc(io_tree
, page_start
,
2549 page_end
, GFP_NOFS
);
2551 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2552 set_page_dirty(page
);
2554 page_cache_release(page
);
2555 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
2559 mutex_unlock(&inode
->i_mutex
);
2563 static int btrfs_ioctl_resize(struct btrfs_root
*root
, void __user
*arg
)
2567 struct btrfs_ioctl_vol_args
*vol_args
;
2568 struct btrfs_trans_handle
*trans
;
2574 vol_args
= kmalloc(sizeof(*vol_args
), GFP_NOFS
);
2579 if (copy_from_user(vol_args
, arg
, sizeof(*vol_args
))) {
2583 namelen
= strlen(vol_args
->name
);
2584 if (namelen
> BTRFS_VOL_NAME_MAX
) {
2589 sizestr
= vol_args
->name
;
2590 if (!strcmp(sizestr
, "max"))
2591 new_size
= root
->fs_info
->sb
->s_bdev
->bd_inode
->i_size
;
2593 if (sizestr
[0] == '-') {
2596 } else if (sizestr
[0] == '+') {
2600 new_size
= btrfs_parse_size(sizestr
);
2601 if (new_size
== 0) {
2607 mutex_lock(&root
->fs_info
->fs_mutex
);
2608 old_size
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
2611 if (new_size
> old_size
) {
2615 new_size
= old_size
- new_size
;
2616 } else if (mod
> 0) {
2617 new_size
= old_size
+ new_size
;
2620 if (new_size
< 256 * 1024 * 1024) {
2624 if (new_size
> root
->fs_info
->sb
->s_bdev
->bd_inode
->i_size
) {
2629 do_div(new_size
, root
->sectorsize
);
2630 new_size
*= root
->sectorsize
;
2632 printk("new size is %Lu\n", new_size
);
2633 if (new_size
> old_size
) {
2634 trans
= btrfs_start_transaction(root
, 1);
2635 ret
= btrfs_grow_extent_tree(trans
, root
, new_size
);
2636 btrfs_commit_transaction(trans
, root
);
2638 ret
= btrfs_shrink_extent_tree(root
, new_size
);
2642 mutex_unlock(&root
->fs_info
->fs_mutex
);
2648 static int noinline
btrfs_ioctl_snap_create(struct btrfs_root
*root
,
2651 struct btrfs_ioctl_vol_args
*vol_args
;
2652 struct btrfs_dir_item
*di
;
2653 struct btrfs_path
*path
;
2658 vol_args
= kmalloc(sizeof(*vol_args
), GFP_NOFS
);
2663 if (copy_from_user(vol_args
, arg
, sizeof(*vol_args
))) {
2668 namelen
= strlen(vol_args
->name
);
2669 if (namelen
> BTRFS_VOL_NAME_MAX
) {
2673 if (strchr(vol_args
->name
, '/')) {
2678 path
= btrfs_alloc_path();
2684 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2685 mutex_lock(&root
->fs_info
->fs_mutex
);
2686 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2688 vol_args
->name
, namelen
, 0);
2689 mutex_unlock(&root
->fs_info
->fs_mutex
);
2690 btrfs_free_path(path
);
2692 if (di
&& !IS_ERR(di
)) {
2702 if (root
== root
->fs_info
->tree_root
)
2703 ret
= create_subvol(root
, vol_args
->name
, namelen
);
2705 ret
= create_snapshot(root
, vol_args
->name
, namelen
);
2711 static int btrfs_ioctl_defrag(struct file
*file
)
2713 struct inode
*inode
= fdentry(file
)->d_inode
;
2714 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2716 switch (inode
->i_mode
& S_IFMT
) {
2718 mutex_lock(&root
->fs_info
->fs_mutex
);
2719 btrfs_defrag_root(root
, 0);
2720 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2721 mutex_unlock(&root
->fs_info
->fs_mutex
);
2724 btrfs_defrag_file(file
);
2731 long btrfs_ioctl(struct file
*file
, unsigned int
2732 cmd
, unsigned long arg
)
2734 struct btrfs_root
*root
= BTRFS_I(fdentry(file
)->d_inode
)->root
;
2737 case BTRFS_IOC_SNAP_CREATE
:
2738 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2739 case BTRFS_IOC_DEFRAG
:
2740 return btrfs_ioctl_defrag(file
);
2741 case BTRFS_IOC_RESIZE
:
2742 return btrfs_ioctl_resize(root
, (void __user
*)arg
);
2749 * Called inside transaction, so use GFP_NOFS
2751 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2753 struct btrfs_inode
*ei
;
2755 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2759 ei
->ordered_trans
= 0;
2760 return &ei
->vfs_inode
;
2763 void btrfs_destroy_inode(struct inode
*inode
)
2765 WARN_ON(!list_empty(&inode
->i_dentry
));
2766 WARN_ON(inode
->i_data
.nrpages
);
2768 btrfs_drop_extent_cache(inode
, 0, (u64
)-1);
2769 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2772 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2773 static void init_once(struct kmem_cache
* cachep
, void *foo
)
2775 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2776 unsigned long flags
)
2779 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2781 inode_init_once(&ei
->vfs_inode
);
2784 void btrfs_destroy_cachep(void)
2786 if (btrfs_inode_cachep
)
2787 kmem_cache_destroy(btrfs_inode_cachep
);
2788 if (btrfs_trans_handle_cachep
)
2789 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2790 if (btrfs_transaction_cachep
)
2791 kmem_cache_destroy(btrfs_transaction_cachep
);
2792 if (btrfs_bit_radix_cachep
)
2793 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2794 if (btrfs_path_cachep
)
2795 kmem_cache_destroy(btrfs_path_cachep
);
2798 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2799 unsigned long extra_flags
,
2800 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2801 void (*ctor
)(struct kmem_cache
*, void *)
2803 void (*ctor
)(void *, struct kmem_cache
*,
2808 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2809 SLAB_MEM_SPREAD
| extra_flags
), ctor
2810 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2816 int btrfs_init_cachep(void)
2818 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2819 sizeof(struct btrfs_inode
),
2821 if (!btrfs_inode_cachep
)
2823 btrfs_trans_handle_cachep
=
2824 btrfs_cache_create("btrfs_trans_handle_cache",
2825 sizeof(struct btrfs_trans_handle
),
2827 if (!btrfs_trans_handle_cachep
)
2829 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
2830 sizeof(struct btrfs_transaction
),
2832 if (!btrfs_transaction_cachep
)
2834 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
2835 sizeof(struct btrfs_path
),
2837 if (!btrfs_path_cachep
)
2839 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
2840 SLAB_DESTROY_BY_RCU
, NULL
);
2841 if (!btrfs_bit_radix_cachep
)
2845 btrfs_destroy_cachep();
2849 static int btrfs_getattr(struct vfsmount
*mnt
,
2850 struct dentry
*dentry
, struct kstat
*stat
)
2852 struct inode
*inode
= dentry
->d_inode
;
2853 generic_fillattr(inode
, stat
);
2854 stat
->blksize
= PAGE_CACHE_SIZE
;
2855 stat
->blocks
= inode
->i_blocks
+ (BTRFS_I(inode
)->delalloc_bytes
>> 9);
2859 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
2860 struct inode
* new_dir
,struct dentry
*new_dentry
)
2862 struct btrfs_trans_handle
*trans
;
2863 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
2864 struct inode
*new_inode
= new_dentry
->d_inode
;
2865 struct inode
*old_inode
= old_dentry
->d_inode
;
2866 struct timespec ctime
= CURRENT_TIME
;
2867 struct btrfs_path
*path
;
2870 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
2871 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
2875 mutex_lock(&root
->fs_info
->fs_mutex
);
2876 ret
= btrfs_check_free_space(root
, 1, 0);
2880 trans
= btrfs_start_transaction(root
, 1);
2882 btrfs_set_trans_block_group(trans
, new_dir
);
2883 path
= btrfs_alloc_path();
2889 old_dentry
->d_inode
->i_nlink
++;
2890 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
2891 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
2892 old_inode
->i_ctime
= ctime
;
2894 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
2899 new_inode
->i_ctime
= CURRENT_TIME
;
2900 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
2904 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
, 1);
2909 btrfs_free_path(path
);
2910 btrfs_end_transaction(trans
, root
);
2912 mutex_unlock(&root
->fs_info
->fs_mutex
);
2916 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
2917 const char *symname
)
2919 struct btrfs_trans_handle
*trans
;
2920 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2921 struct btrfs_path
*path
;
2922 struct btrfs_key key
;
2923 struct inode
*inode
= NULL
;
2930 struct btrfs_file_extent_item
*ei
;
2931 struct extent_buffer
*leaf
;
2932 unsigned long nr
= 0;
2934 name_len
= strlen(symname
) + 1;
2935 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
2936 return -ENAMETOOLONG
;
2938 mutex_lock(&root
->fs_info
->fs_mutex
);
2939 err
= btrfs_check_free_space(root
, 1, 0);
2943 trans
= btrfs_start_transaction(root
, 1);
2944 btrfs_set_trans_block_group(trans
, dir
);
2946 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2952 inode
= btrfs_new_inode(trans
, root
, dentry
->d_name
.name
,
2954 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
2955 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
2956 err
= PTR_ERR(inode
);
2960 btrfs_set_trans_block_group(trans
, inode
);
2961 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0);
2965 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2966 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
2967 inode
->i_fop
= &btrfs_file_operations
;
2968 inode
->i_op
= &btrfs_file_inode_operations
;
2969 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
2970 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
2971 inode
->i_mapping
, GFP_NOFS
);
2972 BTRFS_I(inode
)->delalloc_bytes
= 0;
2973 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
2975 dir
->i_sb
->s_dirt
= 1;
2976 btrfs_update_inode_block_group(trans
, inode
);
2977 btrfs_update_inode_block_group(trans
, dir
);
2981 path
= btrfs_alloc_path();
2983 key
.objectid
= inode
->i_ino
;
2985 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2986 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
2987 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2993 leaf
= path
->nodes
[0];
2994 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
2995 struct btrfs_file_extent_item
);
2996 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
2997 btrfs_set_file_extent_type(leaf
, ei
,
2998 BTRFS_FILE_EXTENT_INLINE
);
2999 ptr
= btrfs_file_extent_inline_start(ei
);
3000 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
3001 btrfs_mark_buffer_dirty(leaf
);
3002 btrfs_free_path(path
);
3004 inode
->i_op
= &btrfs_symlink_inode_operations
;
3005 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
3006 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
3007 inode
->i_size
= name_len
- 1;
3008 err
= btrfs_update_inode(trans
, root
, inode
);
3013 nr
= trans
->blocks_used
;
3014 btrfs_end_transaction(trans
, root
);
3016 mutex_unlock(&root
->fs_info
->fs_mutex
);
3018 inode_dec_link_count(inode
);
3021 btrfs_btree_balance_dirty(root
, nr
);
3022 btrfs_throttle(root
);
3025 static int btrfs_permission(struct inode
*inode
, int mask
,
3026 struct nameidata
*nd
)
3028 if (btrfs_test_flag(inode
, READONLY
) && (mask
& MAY_WRITE
))
3030 return generic_permission(inode
, mask
, NULL
);
3033 static struct inode_operations btrfs_dir_inode_operations
= {
3034 .lookup
= btrfs_lookup
,
3035 .create
= btrfs_create
,
3036 .unlink
= btrfs_unlink
,
3038 .mkdir
= btrfs_mkdir
,
3039 .rmdir
= btrfs_rmdir
,
3040 .rename
= btrfs_rename
,
3041 .symlink
= btrfs_symlink
,
3042 .setattr
= btrfs_setattr
,
3043 .mknod
= btrfs_mknod
,
3044 .setxattr
= generic_setxattr
,
3045 .getxattr
= generic_getxattr
,
3046 .listxattr
= btrfs_listxattr
,
3047 .removexattr
= generic_removexattr
,
3048 .permission
= btrfs_permission
,
3050 static struct inode_operations btrfs_dir_ro_inode_operations
= {
3051 .lookup
= btrfs_lookup
,
3052 .permission
= btrfs_permission
,
3054 static struct file_operations btrfs_dir_file_operations
= {
3055 .llseek
= generic_file_llseek
,
3056 .read
= generic_read_dir
,
3057 .readdir
= btrfs_readdir
,
3058 .unlocked_ioctl
= btrfs_ioctl
,
3059 #ifdef CONFIG_COMPAT
3060 .compat_ioctl
= btrfs_ioctl
,
3064 static struct extent_io_ops btrfs_extent_io_ops
= {
3065 .fill_delalloc
= run_delalloc_range
,
3066 .submit_bio_hook
= btrfs_submit_bio_hook
,
3067 .merge_bio_hook
= btrfs_merge_bio_hook
,
3068 .readpage_io_hook
= btrfs_readpage_io_hook
,
3069 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
3070 .set_bit_hook
= btrfs_set_bit_hook
,
3071 .clear_bit_hook
= btrfs_clear_bit_hook
,
3074 static struct address_space_operations btrfs_aops
= {
3075 .readpage
= btrfs_readpage
,
3076 .writepage
= btrfs_writepage
,
3077 .writepages
= btrfs_writepages
,
3078 .readpages
= btrfs_readpages
,
3079 .sync_page
= block_sync_page
,
3081 .invalidatepage
= btrfs_invalidatepage
,
3082 .releasepage
= btrfs_releasepage
,
3083 .set_page_dirty
= __set_page_dirty_nobuffers
,
3086 static struct address_space_operations btrfs_symlink_aops
= {
3087 .readpage
= btrfs_readpage
,
3088 .writepage
= btrfs_writepage
,
3089 .invalidatepage
= btrfs_invalidatepage
,
3090 .releasepage
= btrfs_releasepage
,
3093 static struct inode_operations btrfs_file_inode_operations
= {
3094 .truncate
= btrfs_truncate
,
3095 .getattr
= btrfs_getattr
,
3096 .setattr
= btrfs_setattr
,
3097 .setxattr
= generic_setxattr
,
3098 .getxattr
= generic_getxattr
,
3099 .listxattr
= btrfs_listxattr
,
3100 .removexattr
= generic_removexattr
,
3101 .permission
= btrfs_permission
,
3103 static struct inode_operations btrfs_special_inode_operations
= {
3104 .getattr
= btrfs_getattr
,
3105 .setattr
= btrfs_setattr
,
3106 .permission
= btrfs_permission
,
3108 static struct inode_operations btrfs_symlink_inode_operations
= {
3109 .readlink
= generic_readlink
,
3110 .follow_link
= page_follow_link_light
,
3111 .put_link
= page_put_link
,
3112 .permission
= btrfs_permission
,