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
,
129 root
->root_key
.objectid
,
131 inode
->i_ino
, start
, 0,
132 alloc_hint
, (u64
)-1, &ins
, 1);
137 cur_alloc_size
= ins
.offset
;
138 ret
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
139 start
, ins
.objectid
, ins
.offset
,
141 inode
->i_blocks
+= ins
.offset
>> 9;
142 btrfs_check_file(root
, inode
);
143 num_bytes
-= cur_alloc_size
;
144 alloc_hint
= ins
.objectid
+ ins
.offset
;
145 start
+= cur_alloc_size
;
147 btrfs_drop_extent_cache(inode
, orig_start
,
148 orig_start
+ orig_num_bytes
- 1);
149 btrfs_add_ordered_inode(inode
);
150 btrfs_update_inode(trans
, root
, inode
);
152 btrfs_end_transaction(trans
, root
);
156 static int run_delalloc_nocow(struct inode
*inode
, u64 start
, u64 end
)
164 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
165 struct extent_buffer
*leaf
;
167 struct btrfs_path
*path
;
168 struct btrfs_file_extent_item
*item
;
171 struct btrfs_key found_key
;
173 total_fs_bytes
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
174 path
= btrfs_alloc_path();
177 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
178 inode
->i_ino
, start
, 0);
180 btrfs_free_path(path
);
186 if (path
->slots
[0] == 0)
191 leaf
= path
->nodes
[0];
192 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
193 struct btrfs_file_extent_item
);
195 /* are we inside the extent that was found? */
196 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
197 found_type
= btrfs_key_type(&found_key
);
198 if (found_key
.objectid
!= inode
->i_ino
||
199 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
203 found_type
= btrfs_file_extent_type(leaf
, item
);
204 extent_start
= found_key
.offset
;
205 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
206 u64 extent_num_bytes
;
208 extent_num_bytes
= btrfs_file_extent_num_bytes(leaf
, item
);
209 extent_end
= extent_start
+ extent_num_bytes
;
212 if (loops
&& start
!= extent_start
)
215 if (start
< extent_start
|| start
>= extent_end
)
218 cow_end
= min(end
, extent_end
- 1);
219 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
224 * we may be called by the resizer, make sure we're inside
225 * the limits of the FS
227 if (bytenr
+ extent_num_bytes
> total_fs_bytes
)
230 if (btrfs_count_snapshots_in_path(root
, path
, bytenr
) != 1) {
240 btrfs_free_path(path
);
243 btrfs_release_path(root
, path
);
248 cow_file_range(inode
, start
, cow_end
);
253 static int run_delalloc_range(struct inode
*inode
, u64 start
, u64 end
)
255 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
257 mutex_lock(&root
->fs_info
->fs_mutex
);
258 if (btrfs_test_opt(root
, NODATACOW
) ||
259 btrfs_test_flag(inode
, NODATACOW
))
260 ret
= run_delalloc_nocow(inode
, start
, end
);
262 ret
= cow_file_range(inode
, start
, end
);
264 mutex_unlock(&root
->fs_info
->fs_mutex
);
268 int btrfs_set_bit_hook(struct inode
*inode
, u64 start
, u64 end
,
269 unsigned long old
, unsigned long bits
)
271 if (!(old
& EXTENT_DELALLOC
) && (bits
& EXTENT_DELALLOC
)) {
272 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
273 spin_lock(&root
->fs_info
->delalloc_lock
);
274 BTRFS_I(inode
)->delalloc_bytes
+= end
- start
+ 1;
275 root
->fs_info
->delalloc_bytes
+= end
- start
+ 1;
276 spin_unlock(&root
->fs_info
->delalloc_lock
);
281 int btrfs_clear_bit_hook(struct inode
*inode
, u64 start
, u64 end
,
282 unsigned long old
, unsigned long bits
)
284 if ((old
& EXTENT_DELALLOC
) && (bits
& EXTENT_DELALLOC
)) {
285 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
286 spin_lock(&root
->fs_info
->delalloc_lock
);
287 if (end
- start
+ 1 > root
->fs_info
->delalloc_bytes
) {
288 printk("warning: delalloc account %Lu %Lu\n",
289 end
- start
+ 1, root
->fs_info
->delalloc_bytes
);
290 root
->fs_info
->delalloc_bytes
= 0;
291 BTRFS_I(inode
)->delalloc_bytes
= 0;
293 root
->fs_info
->delalloc_bytes
-= end
- start
+ 1;
294 BTRFS_I(inode
)->delalloc_bytes
-= end
- start
+ 1;
296 spin_unlock(&root
->fs_info
->delalloc_lock
);
301 int btrfs_merge_bio_hook(struct page
*page
, unsigned long offset
,
302 size_t size
, struct bio
*bio
)
304 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
305 struct btrfs_mapping_tree
*map_tree
;
306 u64 logical
= bio
->bi_sector
<< 9;
309 struct bio_vec
*bvec
;
313 bio_for_each_segment(bvec
, bio
, i
) {
314 length
+= bvec
->bv_len
;
316 map_tree
= &root
->fs_info
->mapping_tree
;
318 ret
= btrfs_map_block(map_tree
, READ
, logical
,
319 &map_length
, NULL
, 0);
321 if (map_length
< length
+ size
) {
327 int btrfs_submit_bio_hook(struct inode
*inode
, int rw
, struct bio
*bio
,
330 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
331 struct btrfs_trans_handle
*trans
;
334 if (!(rw
& (1 << BIO_RW
))) {
335 ret
= btrfs_bio_wq_end_io(root
->fs_info
, bio
, 0);
340 if (btrfs_test_opt(root
, NODATASUM
) ||
341 btrfs_test_flag(inode
, NODATASUM
)) {
345 mutex_lock(&root
->fs_info
->fs_mutex
);
346 trans
= btrfs_start_transaction(root
, 1);
347 btrfs_set_trans_block_group(trans
, inode
);
348 btrfs_csum_file_blocks(trans
, root
, inode
, bio
);
349 ret
= btrfs_end_transaction(trans
, root
);
351 mutex_unlock(&root
->fs_info
->fs_mutex
);
353 return btrfs_map_bio(root
, rw
, bio
, mirror_num
);
356 int btrfs_readpage_io_hook(struct page
*page
, u64 start
, u64 end
)
359 struct inode
*inode
= page
->mapping
->host
;
360 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
361 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
362 struct btrfs_csum_item
*item
;
363 struct btrfs_path
*path
= NULL
;
365 if (btrfs_test_opt(root
, NODATASUM
) ||
366 btrfs_test_flag(inode
, NODATASUM
))
368 mutex_lock(&root
->fs_info
->fs_mutex
);
369 path
= btrfs_alloc_path();
370 item
= btrfs_lookup_csum(NULL
, root
, path
, inode
->i_ino
, start
, 0);
373 /* a csum that isn't present is a preallocated region. */
374 if (ret
== -ENOENT
|| ret
== -EFBIG
)
377 printk("no csum found for inode %lu start %Lu\n", inode
->i_ino
, start
);
380 read_extent_buffer(path
->nodes
[0], &csum
, (unsigned long)item
,
382 set_state_private(io_tree
, start
, csum
);
385 btrfs_free_path(path
);
386 mutex_unlock(&root
->fs_info
->fs_mutex
);
390 struct io_failure_record
{
398 int btrfs_readpage_io_failed_hook(struct bio
*failed_bio
,
399 struct page
*page
, u64 start
, u64 end
,
400 struct extent_state
*state
)
402 struct io_failure_record
*failrec
= NULL
;
404 struct extent_map
*em
;
405 struct inode
*inode
= page
->mapping
->host
;
406 struct extent_io_tree
*failure_tree
= &BTRFS_I(inode
)->io_failure_tree
;
412 ret
= get_state_private(failure_tree
, start
, &private);
414 size_t pg_offset
= start
- page_offset(page
);
415 failrec
= kmalloc(sizeof(*failrec
), GFP_NOFS
);
418 failrec
->start
= start
;
419 failrec
->len
= end
- start
+ 1;
420 failrec
->last_mirror
= 0;
422 em
= btrfs_get_extent(inode
, NULL
, pg_offset
, start
,
425 if (!em
|| IS_ERR(em
)) {
429 logical
= start
- em
->start
;
430 logical
= em
->block_start
+ logical
;
431 failrec
->logical
= logical
;
433 set_extent_bits(failure_tree
, start
, end
, EXTENT_LOCKED
|
434 EXTENT_DIRTY
, GFP_NOFS
);
435 set_state_private(failure_tree
, start
,
436 (u64
)(unsigned long)failrec
);
438 failrec
= (struct io_failure_record
*)(unsigned long)private;
440 num_copies
= btrfs_num_copies(
441 &BTRFS_I(inode
)->root
->fs_info
->mapping_tree
,
442 failrec
->logical
, failrec
->len
);
443 failrec
->last_mirror
++;
445 spin_lock_irq(&BTRFS_I(inode
)->io_tree
.lock
);
446 state
= find_first_extent_bit_state(&BTRFS_I(inode
)->io_tree
,
449 if (state
&& state
->start
!= failrec
->start
)
451 spin_unlock_irq(&BTRFS_I(inode
)->io_tree
.lock
);
453 if (!state
|| failrec
->last_mirror
> num_copies
) {
454 set_state_private(failure_tree
, failrec
->start
, 0);
455 clear_extent_bits(failure_tree
, failrec
->start
,
456 failrec
->start
+ failrec
->len
- 1,
457 EXTENT_LOCKED
| EXTENT_DIRTY
, GFP_NOFS
);
461 bio
= bio_alloc(GFP_NOFS
, 1);
462 bio
->bi_private
= state
;
463 bio
->bi_end_io
= failed_bio
->bi_end_io
;
464 bio
->bi_sector
= failrec
->logical
>> 9;
465 bio
->bi_bdev
= failed_bio
->bi_bdev
;
466 bio_add_page(bio
, page
, failrec
->len
, start
- page_offset(page
));
467 btrfs_submit_bio_hook(inode
, READ
, bio
, failrec
->last_mirror
);
471 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
,
472 struct extent_state
*state
)
474 size_t offset
= start
- ((u64
)page
->index
<< PAGE_CACHE_SHIFT
);
475 struct inode
*inode
= page
->mapping
->host
;
476 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
478 u64
private = ~(u32
)0;
480 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
484 if (btrfs_test_opt(root
, NODATASUM
) ||
485 btrfs_test_flag(inode
, NODATASUM
))
487 if (state
&& state
->start
== start
) {
488 private = state
->private;
491 ret
= get_state_private(io_tree
, start
, &private);
493 local_irq_save(flags
);
494 kaddr
= kmap_atomic(page
, KM_IRQ0
);
498 csum
= btrfs_csum_data(root
, kaddr
+ offset
, csum
, end
- start
+ 1);
499 btrfs_csum_final(csum
, (char *)&csum
);
500 if (csum
!= private) {
503 kunmap_atomic(kaddr
, KM_IRQ0
);
504 local_irq_restore(flags
);
506 /* if the io failure tree for this inode is non-empty,
507 * check to see if we've recovered from a failed IO
510 if (count_range_bits(&BTRFS_I(inode
)->io_failure_tree
, &private,
511 (u64
)-1, 1, EXTENT_DIRTY
)) {
513 struct io_failure_record
*failure
;
514 ret
= get_state_private(&BTRFS_I(inode
)->io_failure_tree
,
515 start
, &private_failure
);
517 failure
= (struct io_failure_record
*)(unsigned long)
519 set_state_private(&BTRFS_I(inode
)->io_failure_tree
,
521 clear_extent_bits(&BTRFS_I(inode
)->io_failure_tree
,
523 failure
->start
+ failure
->len
- 1,
524 EXTENT_DIRTY
| EXTENT_LOCKED
,
532 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
533 page
->mapping
->host
->i_ino
, (unsigned long long)start
, csum
,
535 memset(kaddr
+ offset
, 1, end
- start
+ 1);
536 flush_dcache_page(page
);
537 kunmap_atomic(kaddr
, KM_IRQ0
);
538 local_irq_restore(flags
);
542 void btrfs_read_locked_inode(struct inode
*inode
)
544 struct btrfs_path
*path
;
545 struct extent_buffer
*leaf
;
546 struct btrfs_inode_item
*inode_item
;
547 struct btrfs_timespec
*tspec
;
548 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
549 struct btrfs_key location
;
550 u64 alloc_group_block
;
554 path
= btrfs_alloc_path();
556 mutex_lock(&root
->fs_info
->fs_mutex
);
557 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
559 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
563 leaf
= path
->nodes
[0];
564 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
565 struct btrfs_inode_item
);
567 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
568 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
569 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
570 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
571 inode
->i_size
= btrfs_inode_size(leaf
, inode_item
);
573 tspec
= btrfs_inode_atime(inode_item
);
574 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
575 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
577 tspec
= btrfs_inode_mtime(inode_item
);
578 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
579 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
581 tspec
= btrfs_inode_ctime(inode_item
);
582 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
583 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
585 inode
->i_blocks
= btrfs_inode_nblocks(leaf
, inode_item
);
586 inode
->i_generation
= btrfs_inode_generation(leaf
, inode_item
);
588 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
590 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
591 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
593 BTRFS_I(inode
)->flags
= btrfs_inode_flags(leaf
, inode_item
);
594 if (!BTRFS_I(inode
)->block_group
) {
595 BTRFS_I(inode
)->block_group
= btrfs_find_block_group(root
,
597 BTRFS_BLOCK_GROUP_METADATA
, 0);
599 btrfs_free_path(path
);
602 mutex_unlock(&root
->fs_info
->fs_mutex
);
604 switch (inode
->i_mode
& S_IFMT
) {
606 inode
->i_mapping
->a_ops
= &btrfs_aops
;
607 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
608 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
609 inode
->i_fop
= &btrfs_file_operations
;
610 inode
->i_op
= &btrfs_file_inode_operations
;
613 inode
->i_fop
= &btrfs_dir_file_operations
;
614 if (root
== root
->fs_info
->tree_root
)
615 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
617 inode
->i_op
= &btrfs_dir_inode_operations
;
620 inode
->i_op
= &btrfs_symlink_inode_operations
;
621 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
622 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
625 init_special_inode(inode
, inode
->i_mode
, rdev
);
631 btrfs_release_path(root
, path
);
632 btrfs_free_path(path
);
633 mutex_unlock(&root
->fs_info
->fs_mutex
);
634 make_bad_inode(inode
);
637 static void fill_inode_item(struct extent_buffer
*leaf
,
638 struct btrfs_inode_item
*item
,
641 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
642 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
643 btrfs_set_inode_size(leaf
, item
, inode
->i_size
);
644 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
645 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
647 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
648 inode
->i_atime
.tv_sec
);
649 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
650 inode
->i_atime
.tv_nsec
);
652 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
653 inode
->i_mtime
.tv_sec
);
654 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
655 inode
->i_mtime
.tv_nsec
);
657 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
658 inode
->i_ctime
.tv_sec
);
659 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
660 inode
->i_ctime
.tv_nsec
);
662 btrfs_set_inode_nblocks(leaf
, item
, inode
->i_blocks
);
663 btrfs_set_inode_generation(leaf
, item
, inode
->i_generation
);
664 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
665 btrfs_set_inode_flags(leaf
, item
, BTRFS_I(inode
)->flags
);
666 btrfs_set_inode_block_group(leaf
, item
,
667 BTRFS_I(inode
)->block_group
->key
.objectid
);
670 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
671 struct btrfs_root
*root
,
674 struct btrfs_inode_item
*inode_item
;
675 struct btrfs_path
*path
;
676 struct extent_buffer
*leaf
;
679 path
= btrfs_alloc_path();
681 ret
= btrfs_lookup_inode(trans
, root
, path
,
682 &BTRFS_I(inode
)->location
, 1);
689 leaf
= path
->nodes
[0];
690 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
691 struct btrfs_inode_item
);
693 fill_inode_item(leaf
, inode_item
, inode
);
694 btrfs_mark_buffer_dirty(leaf
);
695 btrfs_set_inode_last_trans(trans
, inode
);
698 btrfs_release_path(root
, path
);
699 btrfs_free_path(path
);
704 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
705 struct btrfs_root
*root
,
707 struct dentry
*dentry
)
709 struct btrfs_path
*path
;
710 const char *name
= dentry
->d_name
.name
;
711 int name_len
= dentry
->d_name
.len
;
713 struct extent_buffer
*leaf
;
714 struct btrfs_dir_item
*di
;
715 struct btrfs_key key
;
717 path
= btrfs_alloc_path();
723 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
733 leaf
= path
->nodes
[0];
734 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
735 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
738 btrfs_release_path(root
, path
);
740 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
741 key
.objectid
, name
, name_len
, -1);
750 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
752 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
753 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
754 dentry
->d_inode
->i_ino
,
755 dentry
->d_parent
->d_inode
->i_ino
);
757 printk("failed to delete reference to %.*s, "
758 "inode %lu parent %lu\n", name_len
, name
,
759 dentry
->d_inode
->i_ino
,
760 dentry
->d_parent
->d_inode
->i_ino
);
763 btrfs_free_path(path
);
765 dir
->i_size
-= name_len
* 2;
766 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
767 btrfs_update_inode(trans
, root
, dir
);
768 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
769 dentry
->d_inode
->i_nlink
--;
771 drop_nlink(dentry
->d_inode
);
773 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
774 dir
->i_sb
->s_dirt
= 1;
779 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
781 struct btrfs_root
*root
;
782 struct btrfs_trans_handle
*trans
;
783 struct inode
*inode
= dentry
->d_inode
;
785 unsigned long nr
= 0;
787 root
= BTRFS_I(dir
)->root
;
788 mutex_lock(&root
->fs_info
->fs_mutex
);
790 ret
= btrfs_check_free_space(root
, 1, 1);
794 trans
= btrfs_start_transaction(root
, 1);
796 btrfs_set_trans_block_group(trans
, dir
);
797 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
798 nr
= trans
->blocks_used
;
800 if (inode
->i_nlink
== 0) {
802 /* if the inode isn't linked anywhere,
803 * we don't need to worry about
806 found
= btrfs_del_ordered_inode(inode
);
808 atomic_dec(&inode
->i_count
);
812 btrfs_end_transaction(trans
, root
);
814 mutex_unlock(&root
->fs_info
->fs_mutex
);
815 btrfs_btree_balance_dirty(root
, nr
);
816 btrfs_throttle(root
);
820 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
822 struct inode
*inode
= dentry
->d_inode
;
825 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
826 struct btrfs_trans_handle
*trans
;
827 unsigned long nr
= 0;
829 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
832 mutex_lock(&root
->fs_info
->fs_mutex
);
833 ret
= btrfs_check_free_space(root
, 1, 1);
837 trans
= btrfs_start_transaction(root
, 1);
838 btrfs_set_trans_block_group(trans
, dir
);
840 /* now the directory is empty */
841 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
846 nr
= trans
->blocks_used
;
847 ret
= btrfs_end_transaction(trans
, root
);
849 mutex_unlock(&root
->fs_info
->fs_mutex
);
850 btrfs_btree_balance_dirty(root
, nr
);
851 btrfs_throttle(root
);
859 * this can truncate away extent items, csum items and directory items.
860 * It starts at a high offset and removes keys until it can't find
861 * any higher than i_size.
863 * csum items that cross the new i_size are truncated to the new size
866 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
867 struct btrfs_root
*root
,
872 struct btrfs_path
*path
;
873 struct btrfs_key key
;
874 struct btrfs_key found_key
;
876 struct extent_buffer
*leaf
;
877 struct btrfs_file_extent_item
*fi
;
878 u64 extent_start
= 0;
879 u64 extent_num_bytes
= 0;
885 int pending_del_nr
= 0;
886 int pending_del_slot
= 0;
887 int extent_type
= -1;
889 btrfs_drop_extent_cache(inode
, inode
->i_size
, (u64
)-1);
890 path
= btrfs_alloc_path();
894 /* FIXME, add redo link to tree so we don't leak on crash */
895 key
.objectid
= inode
->i_ino
;
896 key
.offset
= (u64
)-1;
899 btrfs_init_path(path
);
901 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
906 BUG_ON(path
->slots
[0] == 0);
912 leaf
= path
->nodes
[0];
913 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
914 found_type
= btrfs_key_type(&found_key
);
916 if (found_key
.objectid
!= inode
->i_ino
)
919 if (found_type
< min_type
)
922 item_end
= found_key
.offset
;
923 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
924 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
925 struct btrfs_file_extent_item
);
926 extent_type
= btrfs_file_extent_type(leaf
, fi
);
927 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
929 btrfs_file_extent_num_bytes(leaf
, fi
);
930 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
931 struct btrfs_item
*item
= btrfs_item_nr(leaf
,
933 item_end
+= btrfs_file_extent_inline_len(leaf
,
938 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
939 ret
= btrfs_csum_truncate(trans
, root
, path
,
943 if (item_end
< inode
->i_size
) {
944 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
945 found_type
= BTRFS_INODE_ITEM_KEY
;
946 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
947 found_type
= BTRFS_CSUM_ITEM_KEY
;
948 } else if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
949 found_type
= BTRFS_XATTR_ITEM_KEY
;
950 } else if (found_type
== BTRFS_XATTR_ITEM_KEY
) {
951 found_type
= BTRFS_INODE_REF_KEY
;
952 } else if (found_type
) {
957 btrfs_set_key_type(&key
, found_type
);
960 if (found_key
.offset
>= inode
->i_size
)
966 /* FIXME, shrink the extent if the ref count is only 1 */
967 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
970 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
972 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
975 btrfs_file_extent_num_bytes(leaf
, fi
);
976 extent_num_bytes
= inode
->i_size
-
977 found_key
.offset
+ root
->sectorsize
- 1;
978 extent_num_bytes
= extent_num_bytes
&
979 ~((u64
)root
->sectorsize
- 1);
980 btrfs_set_file_extent_num_bytes(leaf
, fi
,
982 num_dec
= (orig_num_bytes
-
984 if (extent_start
!= 0)
985 dec_i_blocks(inode
, num_dec
);
986 btrfs_mark_buffer_dirty(leaf
);
989 btrfs_file_extent_disk_num_bytes(leaf
,
991 /* FIXME blocksize != 4096 */
992 num_dec
= btrfs_file_extent_num_bytes(leaf
, fi
);
993 if (extent_start
!= 0) {
995 dec_i_blocks(inode
, num_dec
);
997 root_gen
= btrfs_header_generation(leaf
);
998 root_owner
= btrfs_header_owner(leaf
);
1000 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
1002 u32 newsize
= inode
->i_size
- found_key
.offset
;
1003 dec_i_blocks(inode
, item_end
+ 1 -
1004 found_key
.offset
- newsize
);
1006 btrfs_file_extent_calc_inline_size(newsize
);
1007 ret
= btrfs_truncate_item(trans
, root
, path
,
1011 dec_i_blocks(inode
, item_end
+ 1 -
1017 if (!pending_del_nr
) {
1018 /* no pending yet, add ourselves */
1019 pending_del_slot
= path
->slots
[0];
1021 } else if (pending_del_nr
&&
1022 path
->slots
[0] + 1 == pending_del_slot
) {
1023 /* hop on the pending chunk */
1025 pending_del_slot
= path
->slots
[0];
1027 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path
->slots
[0], pending_del_nr
, pending_del_slot
);
1033 ret
= btrfs_free_extent(trans
, root
, extent_start
,
1036 root_gen
, inode
->i_ino
,
1037 found_key
.offset
, 0);
1041 if (path
->slots
[0] == 0) {
1044 btrfs_release_path(root
, path
);
1049 if (pending_del_nr
&&
1050 path
->slots
[0] + 1 != pending_del_slot
) {
1051 struct btrfs_key debug
;
1053 btrfs_item_key_to_cpu(path
->nodes
[0], &debug
,
1055 ret
= btrfs_del_items(trans
, root
, path
,
1060 btrfs_release_path(root
, path
);
1066 if (pending_del_nr
) {
1067 ret
= btrfs_del_items(trans
, root
, path
, pending_del_slot
,
1070 btrfs_release_path(root
, path
);
1071 btrfs_free_path(path
);
1072 inode
->i_sb
->s_dirt
= 1;
1076 static int btrfs_cow_one_page(struct inode
*inode
, struct page
*page
,
1080 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1081 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
1082 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
1085 WARN_ON(!PageLocked(page
));
1086 set_page_extent_mapped(page
);
1088 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
1089 set_extent_delalloc(&BTRFS_I(inode
)->io_tree
, page_start
,
1090 page_end
, GFP_NOFS
);
1092 if (zero_start
!= PAGE_CACHE_SIZE
) {
1094 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
1095 flush_dcache_page(page
);
1098 set_page_dirty(page
);
1099 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
1105 * taken from block_truncate_page, but does cow as it zeros out
1106 * any bytes left in the last page in the file.
1108 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
1110 struct inode
*inode
= mapping
->host
;
1111 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1112 u32 blocksize
= root
->sectorsize
;
1113 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
1114 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
1119 if ((offset
& (blocksize
- 1)) == 0)
1123 page
= grab_cache_page(mapping
, index
);
1126 if (!PageUptodate(page
)) {
1127 ret
= btrfs_readpage(NULL
, page
);
1129 if (!PageUptodate(page
)) {
1134 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
1136 ret
= btrfs_cow_one_page(inode
, page
, offset
);
1139 page_cache_release(page
);
1144 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
1146 struct inode
*inode
= dentry
->d_inode
;
1149 err
= inode_change_ok(inode
, attr
);
1153 if (S_ISREG(inode
->i_mode
) &&
1154 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
1155 struct btrfs_trans_handle
*trans
;
1156 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1157 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1159 u64 mask
= root
->sectorsize
- 1;
1160 u64 hole_start
= (inode
->i_size
+ mask
) & ~mask
;
1161 u64 block_end
= (attr
->ia_size
+ mask
) & ~mask
;
1165 if (attr
->ia_size
<= hole_start
)
1168 mutex_lock(&root
->fs_info
->fs_mutex
);
1169 err
= btrfs_check_free_space(root
, 1, 0);
1170 mutex_unlock(&root
->fs_info
->fs_mutex
);
1174 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
1176 lock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
1177 hole_size
= block_end
- hole_start
;
1179 mutex_lock(&root
->fs_info
->fs_mutex
);
1180 trans
= btrfs_start_transaction(root
, 1);
1181 btrfs_set_trans_block_group(trans
, inode
);
1182 err
= btrfs_drop_extents(trans
, root
, inode
,
1183 hole_start
, block_end
, hole_start
,
1186 if (alloc_hint
!= EXTENT_MAP_INLINE
) {
1187 err
= btrfs_insert_file_extent(trans
, root
,
1191 btrfs_drop_extent_cache(inode
, hole_start
,
1193 btrfs_check_file(root
, inode
);
1195 btrfs_end_transaction(trans
, root
);
1196 mutex_unlock(&root
->fs_info
->fs_mutex
);
1197 unlock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
1202 err
= inode_setattr(inode
, attr
);
1207 void btrfs_put_inode(struct inode
*inode
)
1211 if (!BTRFS_I(inode
)->ordered_trans
) {
1215 if (mapping_tagged(inode
->i_mapping
, PAGECACHE_TAG_DIRTY
) ||
1216 mapping_tagged(inode
->i_mapping
, PAGECACHE_TAG_WRITEBACK
))
1219 ret
= btrfs_del_ordered_inode(inode
);
1221 atomic_dec(&inode
->i_count
);
1225 void btrfs_delete_inode(struct inode
*inode
)
1227 struct btrfs_trans_handle
*trans
;
1228 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1232 truncate_inode_pages(&inode
->i_data
, 0);
1233 if (is_bad_inode(inode
)) {
1238 mutex_lock(&root
->fs_info
->fs_mutex
);
1239 trans
= btrfs_start_transaction(root
, 1);
1241 btrfs_set_trans_block_group(trans
, inode
);
1242 ret
= btrfs_truncate_in_trans(trans
, root
, inode
, 0);
1244 goto no_delete_lock
;
1246 nr
= trans
->blocks_used
;
1249 btrfs_end_transaction(trans
, root
);
1250 mutex_unlock(&root
->fs_info
->fs_mutex
);
1251 btrfs_btree_balance_dirty(root
, nr
);
1252 btrfs_throttle(root
);
1256 nr
= trans
->blocks_used
;
1257 btrfs_end_transaction(trans
, root
);
1258 mutex_unlock(&root
->fs_info
->fs_mutex
);
1259 btrfs_btree_balance_dirty(root
, nr
);
1260 btrfs_throttle(root
);
1266 * this returns the key found in the dir entry in the location pointer.
1267 * If no dir entries were found, location->objectid is 0.
1269 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
1270 struct btrfs_key
*location
)
1272 const char *name
= dentry
->d_name
.name
;
1273 int namelen
= dentry
->d_name
.len
;
1274 struct btrfs_dir_item
*di
;
1275 struct btrfs_path
*path
;
1276 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1279 if (namelen
== 1 && strcmp(name
, ".") == 0) {
1280 location
->objectid
= dir
->i_ino
;
1281 location
->type
= BTRFS_INODE_ITEM_KEY
;
1282 location
->offset
= 0;
1285 path
= btrfs_alloc_path();
1288 if (namelen
== 2 && strcmp(name
, "..") == 0) {
1289 struct btrfs_key key
;
1290 struct extent_buffer
*leaf
;
1294 key
.objectid
= dir
->i_ino
;
1295 btrfs_set_key_type(&key
, BTRFS_INODE_REF_KEY
);
1297 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1301 leaf
= path
->nodes
[0];
1302 slot
= path
->slots
[0];
1303 nritems
= btrfs_header_nritems(leaf
);
1304 if (slot
>= nritems
)
1307 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
1308 if (key
.objectid
!= dir
->i_ino
||
1309 key
.type
!= BTRFS_INODE_REF_KEY
) {
1312 location
->objectid
= key
.offset
;
1313 location
->type
= BTRFS_INODE_ITEM_KEY
;
1314 location
->offset
= 0;
1318 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
1322 if (!di
|| IS_ERR(di
)) {
1325 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
1327 btrfs_free_path(path
);
1330 location
->objectid
= 0;
1335 * when we hit a tree root in a directory, the btrfs part of the inode
1336 * needs to be changed to reflect the root directory of the tree root. This
1337 * is kind of like crossing a mount point.
1339 static int fixup_tree_root_location(struct btrfs_root
*root
,
1340 struct btrfs_key
*location
,
1341 struct btrfs_root
**sub_root
,
1342 struct dentry
*dentry
)
1344 struct btrfs_path
*path
;
1345 struct btrfs_root_item
*ri
;
1347 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
1349 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
1352 path
= btrfs_alloc_path();
1354 mutex_lock(&root
->fs_info
->fs_mutex
);
1356 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
1357 dentry
->d_name
.name
,
1358 dentry
->d_name
.len
);
1359 if (IS_ERR(*sub_root
))
1360 return PTR_ERR(*sub_root
);
1362 ri
= &(*sub_root
)->root_item
;
1363 location
->objectid
= btrfs_root_dirid(ri
);
1364 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1365 location
->offset
= 0;
1367 btrfs_free_path(path
);
1368 mutex_unlock(&root
->fs_info
->fs_mutex
);
1372 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
1374 struct btrfs_iget_args
*args
= p
;
1375 inode
->i_ino
= args
->ino
;
1376 BTRFS_I(inode
)->root
= args
->root
;
1377 BTRFS_I(inode
)->delalloc_bytes
= 0;
1378 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1379 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1380 inode
->i_mapping
, GFP_NOFS
);
1381 extent_io_tree_init(&BTRFS_I(inode
)->io_failure_tree
,
1382 inode
->i_mapping
, GFP_NOFS
);
1386 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
1388 struct btrfs_iget_args
*args
= opaque
;
1389 return (args
->ino
== inode
->i_ino
&&
1390 args
->root
== BTRFS_I(inode
)->root
);
1393 struct inode
*btrfs_ilookup(struct super_block
*s
, u64 objectid
,
1396 struct btrfs_iget_args args
;
1397 args
.ino
= objectid
;
1398 args
.root
= btrfs_lookup_fs_root(btrfs_sb(s
)->fs_info
, root_objectid
);
1403 return ilookup5(s
, objectid
, btrfs_find_actor
, (void *)&args
);
1406 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1407 struct btrfs_root
*root
)
1409 struct inode
*inode
;
1410 struct btrfs_iget_args args
;
1411 args
.ino
= objectid
;
1414 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
1415 btrfs_init_locked_inode
,
1420 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
1421 struct nameidata
*nd
)
1423 struct inode
* inode
;
1424 struct btrfs_inode
*bi
= BTRFS_I(dir
);
1425 struct btrfs_root
*root
= bi
->root
;
1426 struct btrfs_root
*sub_root
= root
;
1427 struct btrfs_key location
;
1430 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
1431 return ERR_PTR(-ENAMETOOLONG
);
1433 mutex_lock(&root
->fs_info
->fs_mutex
);
1434 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
1435 mutex_unlock(&root
->fs_info
->fs_mutex
);
1438 return ERR_PTR(ret
);
1441 if (location
.objectid
) {
1442 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
1445 return ERR_PTR(ret
);
1447 return ERR_PTR(-ENOENT
);
1448 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
1451 return ERR_PTR(-EACCES
);
1452 if (inode
->i_state
& I_NEW
) {
1453 /* the inode and parent dir are two different roots */
1454 if (sub_root
!= root
) {
1456 sub_root
->inode
= inode
;
1458 BTRFS_I(inode
)->root
= sub_root
;
1459 memcpy(&BTRFS_I(inode
)->location
, &location
,
1461 btrfs_read_locked_inode(inode
);
1462 unlock_new_inode(inode
);
1465 return d_splice_alias(inode
, dentry
);
1468 static unsigned char btrfs_filetype_table
[] = {
1469 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
1472 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
1474 struct inode
*inode
= filp
->f_dentry
->d_inode
;
1475 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1476 struct btrfs_item
*item
;
1477 struct btrfs_dir_item
*di
;
1478 struct btrfs_key key
;
1479 struct btrfs_key found_key
;
1480 struct btrfs_path
*path
;
1483 struct extent_buffer
*leaf
;
1486 unsigned char d_type
;
1491 int key_type
= BTRFS_DIR_INDEX_KEY
;
1496 /* FIXME, use a real flag for deciding about the key type */
1497 if (root
->fs_info
->tree_root
== root
)
1498 key_type
= BTRFS_DIR_ITEM_KEY
;
1500 /* special case for "." */
1501 if (filp
->f_pos
== 0) {
1502 over
= filldir(dirent
, ".", 1,
1510 mutex_lock(&root
->fs_info
->fs_mutex
);
1511 key
.objectid
= inode
->i_ino
;
1512 path
= btrfs_alloc_path();
1515 /* special case for .., just use the back ref */
1516 if (filp
->f_pos
== 1) {
1517 btrfs_set_key_type(&key
, BTRFS_INODE_REF_KEY
);
1519 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1521 leaf
= path
->nodes
[0];
1522 slot
= path
->slots
[0];
1523 nritems
= btrfs_header_nritems(leaf
);
1524 if (slot
>= nritems
) {
1525 btrfs_release_path(root
, path
);
1526 goto read_dir_items
;
1528 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1529 btrfs_release_path(root
, path
);
1530 if (found_key
.objectid
!= key
.objectid
||
1531 found_key
.type
!= BTRFS_INODE_REF_KEY
)
1532 goto read_dir_items
;
1533 over
= filldir(dirent
, "..", 2,
1534 2, found_key
.offset
, DT_DIR
);
1541 btrfs_set_key_type(&key
, key_type
);
1542 key
.offset
= filp
->f_pos
;
1544 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1549 leaf
= path
->nodes
[0];
1550 nritems
= btrfs_header_nritems(leaf
);
1551 slot
= path
->slots
[0];
1552 if (advance
|| slot
>= nritems
) {
1553 if (slot
>= nritems
-1) {
1554 ret
= btrfs_next_leaf(root
, path
);
1557 leaf
= path
->nodes
[0];
1558 nritems
= btrfs_header_nritems(leaf
);
1559 slot
= path
->slots
[0];
1566 item
= btrfs_item_nr(leaf
, slot
);
1567 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1569 if (found_key
.objectid
!= key
.objectid
)
1571 if (btrfs_key_type(&found_key
) != key_type
)
1573 if (found_key
.offset
< filp
->f_pos
)
1576 filp
->f_pos
= found_key
.offset
;
1578 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1580 di_total
= btrfs_item_size(leaf
, item
);
1581 while(di_cur
< di_total
) {
1582 struct btrfs_key location
;
1584 name_len
= btrfs_dir_name_len(leaf
, di
);
1585 if (name_len
< 32) {
1586 name_ptr
= tmp_name
;
1588 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
1591 read_extent_buffer(leaf
, name_ptr
,
1592 (unsigned long)(di
+ 1), name_len
);
1594 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
1595 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
1596 over
= filldir(dirent
, name_ptr
, name_len
,
1601 if (name_ptr
!= tmp_name
)
1606 di_len
= btrfs_dir_name_len(leaf
, di
) +
1607 btrfs_dir_data_len(leaf
, di
) +sizeof(*di
);
1609 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1612 if (key_type
== BTRFS_DIR_INDEX_KEY
)
1613 filp
->f_pos
= INT_LIMIT(typeof(filp
->f_pos
));
1619 btrfs_release_path(root
, path
);
1620 btrfs_free_path(path
);
1621 mutex_unlock(&root
->fs_info
->fs_mutex
);
1625 int btrfs_write_inode(struct inode
*inode
, int wait
)
1627 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1628 struct btrfs_trans_handle
*trans
;
1632 mutex_lock(&root
->fs_info
->fs_mutex
);
1633 trans
= btrfs_start_transaction(root
, 1);
1634 btrfs_set_trans_block_group(trans
, inode
);
1635 ret
= btrfs_commit_transaction(trans
, root
);
1636 mutex_unlock(&root
->fs_info
->fs_mutex
);
1642 * This is somewhat expensive, updating the tree every time the
1643 * inode changes. But, it is most likely to find the inode in cache.
1644 * FIXME, needs more benchmarking...there are no reasons other than performance
1645 * to keep or drop this code.
1647 void btrfs_dirty_inode(struct inode
*inode
)
1649 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1650 struct btrfs_trans_handle
*trans
;
1652 mutex_lock(&root
->fs_info
->fs_mutex
);
1653 trans
= btrfs_start_transaction(root
, 1);
1654 btrfs_set_trans_block_group(trans
, inode
);
1655 btrfs_update_inode(trans
, root
, inode
);
1656 btrfs_end_transaction(trans
, root
);
1657 mutex_unlock(&root
->fs_info
->fs_mutex
);
1660 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1661 struct btrfs_root
*root
,
1662 const char *name
, int name_len
,
1665 struct btrfs_block_group_cache
*group
,
1668 struct inode
*inode
;
1669 struct btrfs_inode_item
*inode_item
;
1670 struct btrfs_block_group_cache
*new_inode_group
;
1671 struct btrfs_key
*location
;
1672 struct btrfs_path
*path
;
1673 struct btrfs_inode_ref
*ref
;
1674 struct btrfs_key key
[2];
1680 path
= btrfs_alloc_path();
1683 inode
= new_inode(root
->fs_info
->sb
);
1685 return ERR_PTR(-ENOMEM
);
1687 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1688 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1689 inode
->i_mapping
, GFP_NOFS
);
1690 extent_io_tree_init(&BTRFS_I(inode
)->io_failure_tree
,
1691 inode
->i_mapping
, GFP_NOFS
);
1692 BTRFS_I(inode
)->delalloc_bytes
= 0;
1693 BTRFS_I(inode
)->root
= root
;
1699 new_inode_group
= btrfs_find_block_group(root
, group
, 0,
1700 BTRFS_BLOCK_GROUP_METADATA
, owner
);
1701 if (!new_inode_group
) {
1702 printk("find_block group failed\n");
1703 new_inode_group
= group
;
1705 BTRFS_I(inode
)->block_group
= new_inode_group
;
1706 BTRFS_I(inode
)->flags
= 0;
1708 key
[0].objectid
= objectid
;
1709 btrfs_set_key_type(&key
[0], BTRFS_INODE_ITEM_KEY
);
1712 key
[1].objectid
= objectid
;
1713 btrfs_set_key_type(&key
[1], BTRFS_INODE_REF_KEY
);
1714 key
[1].offset
= ref_objectid
;
1716 sizes
[0] = sizeof(struct btrfs_inode_item
);
1717 sizes
[1] = name_len
+ sizeof(*ref
);
1719 ret
= btrfs_insert_empty_items(trans
, root
, path
, key
, sizes
, 2);
1723 if (objectid
> root
->highest_inode
)
1724 root
->highest_inode
= objectid
;
1726 inode
->i_uid
= current
->fsuid
;
1727 inode
->i_gid
= current
->fsgid
;
1728 inode
->i_mode
= mode
;
1729 inode
->i_ino
= objectid
;
1730 inode
->i_blocks
= 0;
1731 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1732 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
1733 struct btrfs_inode_item
);
1734 fill_inode_item(path
->nodes
[0], inode_item
, inode
);
1736 ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0] + 1,
1737 struct btrfs_inode_ref
);
1738 btrfs_set_inode_ref_name_len(path
->nodes
[0], ref
, name_len
);
1739 ptr
= (unsigned long)(ref
+ 1);
1740 write_extent_buffer(path
->nodes
[0], name
, ptr
, name_len
);
1742 btrfs_mark_buffer_dirty(path
->nodes
[0]);
1743 btrfs_free_path(path
);
1745 location
= &BTRFS_I(inode
)->location
;
1746 location
->objectid
= objectid
;
1747 location
->offset
= 0;
1748 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1750 insert_inode_hash(inode
);
1753 btrfs_free_path(path
);
1754 return ERR_PTR(ret
);
1757 static inline u8
btrfs_inode_type(struct inode
*inode
)
1759 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1762 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1763 struct dentry
*dentry
, struct inode
*inode
,
1767 struct btrfs_key key
;
1768 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1769 struct inode
*parent_inode
;
1771 key
.objectid
= inode
->i_ino
;
1772 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1775 ret
= btrfs_insert_dir_item(trans
, root
,
1776 dentry
->d_name
.name
, dentry
->d_name
.len
,
1777 dentry
->d_parent
->d_inode
->i_ino
,
1778 &key
, btrfs_inode_type(inode
));
1781 ret
= btrfs_insert_inode_ref(trans
, root
,
1782 dentry
->d_name
.name
,
1785 dentry
->d_parent
->d_inode
->i_ino
);
1787 parent_inode
= dentry
->d_parent
->d_inode
;
1788 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1789 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1790 ret
= btrfs_update_inode(trans
, root
,
1791 dentry
->d_parent
->d_inode
);
1796 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1797 struct dentry
*dentry
, struct inode
*inode
,
1800 int err
= btrfs_add_link(trans
, dentry
, inode
, backref
);
1802 d_instantiate(dentry
, inode
);
1810 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1811 int mode
, dev_t rdev
)
1813 struct btrfs_trans_handle
*trans
;
1814 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1815 struct inode
*inode
= NULL
;
1819 unsigned long nr
= 0;
1821 if (!new_valid_dev(rdev
))
1824 mutex_lock(&root
->fs_info
->fs_mutex
);
1825 err
= btrfs_check_free_space(root
, 1, 0);
1829 trans
= btrfs_start_transaction(root
, 1);
1830 btrfs_set_trans_block_group(trans
, dir
);
1832 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1838 inode
= btrfs_new_inode(trans
, root
, dentry
->d_name
.name
,
1840 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
1841 BTRFS_I(dir
)->block_group
, mode
);
1842 err
= PTR_ERR(inode
);
1846 btrfs_set_trans_block_group(trans
, inode
);
1847 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0);
1851 inode
->i_op
= &btrfs_special_inode_operations
;
1852 init_special_inode(inode
, inode
->i_mode
, rdev
);
1853 btrfs_update_inode(trans
, root
, inode
);
1855 dir
->i_sb
->s_dirt
= 1;
1856 btrfs_update_inode_block_group(trans
, inode
);
1857 btrfs_update_inode_block_group(trans
, dir
);
1859 nr
= trans
->blocks_used
;
1860 btrfs_end_transaction(trans
, root
);
1862 mutex_unlock(&root
->fs_info
->fs_mutex
);
1865 inode_dec_link_count(inode
);
1868 btrfs_btree_balance_dirty(root
, nr
);
1869 btrfs_throttle(root
);
1873 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1874 int mode
, struct nameidata
*nd
)
1876 struct btrfs_trans_handle
*trans
;
1877 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1878 struct inode
*inode
= NULL
;
1881 unsigned long nr
= 0;
1884 mutex_lock(&root
->fs_info
->fs_mutex
);
1885 err
= btrfs_check_free_space(root
, 1, 0);
1888 trans
= btrfs_start_transaction(root
, 1);
1889 btrfs_set_trans_block_group(trans
, dir
);
1891 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1897 inode
= btrfs_new_inode(trans
, root
, dentry
->d_name
.name
,
1899 dentry
->d_parent
->d_inode
->i_ino
,
1900 objectid
, BTRFS_I(dir
)->block_group
, mode
);
1901 err
= PTR_ERR(inode
);
1905 btrfs_set_trans_block_group(trans
, inode
);
1906 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0);
1910 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1911 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
1912 inode
->i_fop
= &btrfs_file_operations
;
1913 inode
->i_op
= &btrfs_file_inode_operations
;
1914 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1915 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1916 inode
->i_mapping
, GFP_NOFS
);
1917 extent_io_tree_init(&BTRFS_I(inode
)->io_failure_tree
,
1918 inode
->i_mapping
, GFP_NOFS
);
1919 BTRFS_I(inode
)->delalloc_bytes
= 0;
1920 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
1922 dir
->i_sb
->s_dirt
= 1;
1923 btrfs_update_inode_block_group(trans
, inode
);
1924 btrfs_update_inode_block_group(trans
, dir
);
1926 nr
= trans
->blocks_used
;
1927 btrfs_end_transaction(trans
, root
);
1929 mutex_unlock(&root
->fs_info
->fs_mutex
);
1932 inode_dec_link_count(inode
);
1935 btrfs_btree_balance_dirty(root
, nr
);
1936 btrfs_throttle(root
);
1940 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1941 struct dentry
*dentry
)
1943 struct btrfs_trans_handle
*trans
;
1944 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1945 struct inode
*inode
= old_dentry
->d_inode
;
1946 unsigned long nr
= 0;
1950 if (inode
->i_nlink
== 0)
1953 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1958 mutex_lock(&root
->fs_info
->fs_mutex
);
1959 err
= btrfs_check_free_space(root
, 1, 0);
1962 trans
= btrfs_start_transaction(root
, 1);
1964 btrfs_set_trans_block_group(trans
, dir
);
1965 atomic_inc(&inode
->i_count
);
1966 err
= btrfs_add_nondir(trans
, dentry
, inode
, 1);
1971 dir
->i_sb
->s_dirt
= 1;
1972 btrfs_update_inode_block_group(trans
, dir
);
1973 err
= btrfs_update_inode(trans
, root
, inode
);
1978 nr
= trans
->blocks_used
;
1979 btrfs_end_transaction(trans
, root
);
1981 mutex_unlock(&root
->fs_info
->fs_mutex
);
1984 inode_dec_link_count(inode
);
1987 btrfs_btree_balance_dirty(root
, nr
);
1988 btrfs_throttle(root
);
1992 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1994 struct inode
*inode
;
1995 struct btrfs_trans_handle
*trans
;
1996 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1998 int drop_on_err
= 0;
2000 unsigned long nr
= 1;
2002 mutex_lock(&root
->fs_info
->fs_mutex
);
2003 err
= btrfs_check_free_space(root
, 1, 0);
2007 trans
= btrfs_start_transaction(root
, 1);
2008 btrfs_set_trans_block_group(trans
, dir
);
2010 if (IS_ERR(trans
)) {
2011 err
= PTR_ERR(trans
);
2015 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2021 inode
= btrfs_new_inode(trans
, root
, dentry
->d_name
.name
,
2023 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
2024 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
2025 if (IS_ERR(inode
)) {
2026 err
= PTR_ERR(inode
);
2031 inode
->i_op
= &btrfs_dir_inode_operations
;
2032 inode
->i_fop
= &btrfs_dir_file_operations
;
2033 btrfs_set_trans_block_group(trans
, inode
);
2036 err
= btrfs_update_inode(trans
, root
, inode
);
2040 err
= btrfs_add_link(trans
, dentry
, inode
, 0);
2044 d_instantiate(dentry
, inode
);
2046 dir
->i_sb
->s_dirt
= 1;
2047 btrfs_update_inode_block_group(trans
, inode
);
2048 btrfs_update_inode_block_group(trans
, dir
);
2051 nr
= trans
->blocks_used
;
2052 btrfs_end_transaction(trans
, root
);
2055 mutex_unlock(&root
->fs_info
->fs_mutex
);
2058 btrfs_btree_balance_dirty(root
, nr
);
2059 btrfs_throttle(root
);
2063 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
2064 size_t pg_offset
, u64 start
, u64 len
,
2070 u64 extent_start
= 0;
2072 u64 objectid
= inode
->i_ino
;
2074 struct btrfs_path
*path
;
2075 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2076 struct btrfs_file_extent_item
*item
;
2077 struct extent_buffer
*leaf
;
2078 struct btrfs_key found_key
;
2079 struct extent_map
*em
= NULL
;
2080 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
2081 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2082 struct btrfs_trans_handle
*trans
= NULL
;
2084 path
= btrfs_alloc_path();
2086 mutex_lock(&root
->fs_info
->fs_mutex
);
2089 spin_lock(&em_tree
->lock
);
2090 em
= lookup_extent_mapping(em_tree
, start
, len
);
2091 spin_unlock(&em_tree
->lock
);
2094 if (em
->start
> start
) {
2095 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
2096 start
, len
, em
->start
, em
->len
);
2099 if (em
->block_start
== EXTENT_MAP_INLINE
&& page
)
2100 free_extent_map(em
);
2104 em
= alloc_extent_map(GFP_NOFS
);
2110 em
->start
= EXTENT_MAP_HOLE
;
2112 em
->bdev
= inode
->i_sb
->s_bdev
;
2113 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
2114 objectid
, start
, trans
!= NULL
);
2121 if (path
->slots
[0] == 0)
2126 leaf
= path
->nodes
[0];
2127 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2128 struct btrfs_file_extent_item
);
2129 /* are we inside the extent that was found? */
2130 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
2131 found_type
= btrfs_key_type(&found_key
);
2132 if (found_key
.objectid
!= objectid
||
2133 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
2137 found_type
= btrfs_file_extent_type(leaf
, item
);
2138 extent_start
= found_key
.offset
;
2139 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
2140 extent_end
= extent_start
+
2141 btrfs_file_extent_num_bytes(leaf
, item
);
2143 if (start
< extent_start
|| start
>= extent_end
) {
2145 if (start
< extent_start
) {
2146 if (start
+ len
<= extent_start
)
2148 em
->len
= extent_end
- extent_start
;
2154 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
2156 em
->start
= extent_start
;
2157 em
->len
= extent_end
- extent_start
;
2158 em
->block_start
= EXTENT_MAP_HOLE
;
2161 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
2162 em
->block_start
= bytenr
;
2163 em
->start
= extent_start
;
2164 em
->len
= extent_end
- extent_start
;
2166 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
2171 size_t extent_offset
;
2174 size
= btrfs_file_extent_inline_len(leaf
, btrfs_item_nr(leaf
,
2176 extent_end
= (extent_start
+ size
+ root
->sectorsize
- 1) &
2177 ~((u64
)root
->sectorsize
- 1);
2178 if (start
< extent_start
|| start
>= extent_end
) {
2180 if (start
< extent_start
) {
2181 if (start
+ len
<= extent_start
)
2183 em
->len
= extent_end
- extent_start
;
2189 em
->block_start
= EXTENT_MAP_INLINE
;
2192 em
->start
= extent_start
;
2197 page_start
= page_offset(page
) + pg_offset
;
2198 extent_offset
= page_start
- extent_start
;
2199 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- pg_offset
,
2200 size
- extent_offset
);
2201 em
->start
= extent_start
+ extent_offset
;
2202 em
->len
= (copy_size
+ root
->sectorsize
- 1) &
2203 ~((u64
)root
->sectorsize
- 1);
2205 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
2206 if (create
== 0 && !PageUptodate(page
)) {
2207 read_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
2209 flush_dcache_page(page
);
2210 } else if (create
&& PageUptodate(page
)) {
2213 free_extent_map(em
);
2215 btrfs_release_path(root
, path
);
2216 trans
= btrfs_start_transaction(root
, 1);
2219 write_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
2221 btrfs_mark_buffer_dirty(leaf
);
2224 set_extent_uptodate(io_tree
, em
->start
,
2225 extent_map_end(em
) - 1, GFP_NOFS
);
2228 printk("unkknown found_type %d\n", found_type
);
2235 em
->block_start
= EXTENT_MAP_HOLE
;
2237 btrfs_release_path(root
, path
);
2238 if (em
->start
> start
|| extent_map_end(em
) <= start
) {
2239 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->len
, start
, len
);
2245 spin_lock(&em_tree
->lock
);
2246 ret
= add_extent_mapping(em_tree
, em
);
2247 if (ret
== -EEXIST
) {
2248 free_extent_map(em
);
2249 em
= lookup_extent_mapping(em_tree
, start
, len
);
2252 printk("failing to insert %Lu %Lu\n", start
, len
);
2255 spin_unlock(&em_tree
->lock
);
2257 btrfs_free_path(path
);
2259 ret
= btrfs_end_transaction(trans
, root
);
2263 mutex_unlock(&root
->fs_info
->fs_mutex
);
2265 free_extent_map(em
);
2267 return ERR_PTR(err
);
2272 static int btrfs_get_block(struct inode
*inode
, sector_t iblock
,
2273 struct buffer_head
*bh_result
, int create
)
2275 struct extent_map
*em
;
2276 u64 start
= (u64
)iblock
<< inode
->i_blkbits
;
2277 struct btrfs_multi_bio
*multi
= NULL
;
2278 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2284 em
= btrfs_get_extent(inode
, NULL
, 0, start
, bh_result
->b_size
, 0);
2286 if (!em
|| IS_ERR(em
))
2289 if (em
->start
> start
|| em
->start
+ em
->len
<= start
)
2292 if (em
->block_start
== EXTENT_MAP_INLINE
) {
2297 if (em
->block_start
== EXTENT_MAP_HOLE
||
2298 em
->block_start
== EXTENT_MAP_DELALLOC
) {
2302 len
= em
->start
+ em
->len
- start
;
2303 len
= min_t(u64
, len
, INT_LIMIT(typeof(bh_result
->b_size
)));
2305 logical
= start
- em
->start
;
2306 logical
= em
->block_start
+ logical
;
2309 ret
= btrfs_map_block(&root
->fs_info
->mapping_tree
, READ
,
2310 logical
, &map_length
, &multi
, 0);
2312 bh_result
->b_blocknr
= multi
->stripes
[0].physical
>> inode
->i_blkbits
;
2313 bh_result
->b_size
= min(map_length
, len
);
2314 bh_result
->b_bdev
= multi
->stripes
[0].dev
->bdev
;
2315 set_buffer_mapped(bh_result
);
2318 free_extent_map(em
);
2322 static ssize_t
btrfs_direct_IO(int rw
, struct kiocb
*iocb
,
2323 const struct iovec
*iov
, loff_t offset
,
2324 unsigned long nr_segs
)
2326 struct file
*file
= iocb
->ki_filp
;
2327 struct inode
*inode
= file
->f_mapping
->host
;
2332 return blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
2333 offset
, nr_segs
, btrfs_get_block
, NULL
);
2336 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
2338 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
2341 int btrfs_readpage(struct file
*file
, struct page
*page
)
2343 struct extent_io_tree
*tree
;
2344 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2345 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
2348 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
2350 struct extent_io_tree
*tree
;
2353 if (current
->flags
& PF_MEMALLOC
) {
2354 redirty_page_for_writepage(wbc
, page
);
2358 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2359 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
2362 static int btrfs_writepages(struct address_space
*mapping
,
2363 struct writeback_control
*wbc
)
2365 struct extent_io_tree
*tree
;
2366 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
2367 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
2371 btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
2372 struct list_head
*pages
, unsigned nr_pages
)
2374 struct extent_io_tree
*tree
;
2375 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
2376 return extent_readpages(tree
, mapping
, pages
, nr_pages
,
2380 static int btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
2382 struct extent_io_tree
*tree
;
2383 struct extent_map_tree
*map
;
2386 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2387 map
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
2388 ret
= try_release_extent_mapping(map
, tree
, page
, gfp_flags
);
2390 ClearPagePrivate(page
);
2391 set_page_private(page
, 0);
2392 page_cache_release(page
);
2397 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
2399 struct extent_io_tree
*tree
;
2401 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2402 extent_invalidatepage(tree
, page
, offset
);
2403 btrfs_releasepage(page
, GFP_NOFS
);
2407 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2408 * called from a page fault handler when a page is first dirtied. Hence we must
2409 * be careful to check for EOF conditions here. We set the page up correctly
2410 * for a written page which means we get ENOSPC checking when writing into
2411 * holes and correct delalloc and unwritten extent mapping on filesystems that
2412 * support these features.
2414 * We are not allowed to take the i_mutex here so we have to play games to
2415 * protect against truncate races as the page could now be beyond EOF. Because
2416 * vmtruncate() writes the inode size before removing pages, once we have the
2417 * page lock we can determine safely if the page is beyond EOF. If it is not
2418 * beyond EOF, then the page is guaranteed safe against truncation until we
2421 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
2423 struct inode
*inode
= fdentry(vma
->vm_file
)->d_inode
;
2424 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2430 mutex_lock(&root
->fs_info
->fs_mutex
);
2431 ret
= btrfs_check_free_space(root
, PAGE_CACHE_SIZE
, 0);
2432 mutex_unlock(&root
->fs_info
->fs_mutex
);
2439 wait_on_page_writeback(page
);
2440 size
= i_size_read(inode
);
2441 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2443 if ((page
->mapping
!= inode
->i_mapping
) ||
2444 (page_start
> size
)) {
2445 /* page got truncated out from underneath us */
2449 /* page is wholly or partially inside EOF */
2450 if (page_start
+ PAGE_CACHE_SIZE
> size
)
2451 end
= size
& ~PAGE_CACHE_MASK
;
2453 end
= PAGE_CACHE_SIZE
;
2455 ret
= btrfs_cow_one_page(inode
, page
, end
);
2463 static void btrfs_truncate(struct inode
*inode
)
2465 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2467 struct btrfs_trans_handle
*trans
;
2470 if (!S_ISREG(inode
->i_mode
))
2472 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
2475 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
2477 mutex_lock(&root
->fs_info
->fs_mutex
);
2478 trans
= btrfs_start_transaction(root
, 1);
2479 btrfs_set_trans_block_group(trans
, inode
);
2481 /* FIXME, add redo link to tree so we don't leak on crash */
2482 ret
= btrfs_truncate_in_trans(trans
, root
, inode
,
2483 BTRFS_EXTENT_DATA_KEY
);
2484 btrfs_update_inode(trans
, root
, inode
);
2485 nr
= trans
->blocks_used
;
2487 ret
= btrfs_end_transaction(trans
, root
);
2489 mutex_unlock(&root
->fs_info
->fs_mutex
);
2490 btrfs_btree_balance_dirty(root
, nr
);
2491 btrfs_throttle(root
);
2494 static int noinline
create_subvol(struct btrfs_root
*root
, char *name
,
2497 struct btrfs_trans_handle
*trans
;
2498 struct btrfs_key key
;
2499 struct btrfs_root_item root_item
;
2500 struct btrfs_inode_item
*inode_item
;
2501 struct extent_buffer
*leaf
;
2502 struct btrfs_root
*new_root
= root
;
2503 struct inode
*inode
;
2508 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
2509 unsigned long nr
= 1;
2511 mutex_lock(&root
->fs_info
->fs_mutex
);
2512 ret
= btrfs_check_free_space(root
, 1, 0);
2516 trans
= btrfs_start_transaction(root
, 1);
2519 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
2524 leaf
= __btrfs_alloc_free_block(trans
, root
, root
->leafsize
,
2525 objectid
, trans
->transid
, 0, 0,
2528 return PTR_ERR(leaf
);
2530 btrfs_set_header_nritems(leaf
, 0);
2531 btrfs_set_header_level(leaf
, 0);
2532 btrfs_set_header_bytenr(leaf
, leaf
->start
);
2533 btrfs_set_header_generation(leaf
, trans
->transid
);
2534 btrfs_set_header_owner(leaf
, objectid
);
2536 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
2537 (unsigned long)btrfs_header_fsid(leaf
),
2539 btrfs_mark_buffer_dirty(leaf
);
2541 inode_item
= &root_item
.inode
;
2542 memset(inode_item
, 0, sizeof(*inode_item
));
2543 inode_item
->generation
= cpu_to_le64(1);
2544 inode_item
->size
= cpu_to_le64(3);
2545 inode_item
->nlink
= cpu_to_le32(1);
2546 inode_item
->nblocks
= cpu_to_le64(1);
2547 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
2549 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
2550 btrfs_set_root_level(&root_item
, 0);
2551 btrfs_set_root_refs(&root_item
, 1);
2552 btrfs_set_root_used(&root_item
, 0);
2554 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
2555 root_item
.drop_level
= 0;
2557 free_extent_buffer(leaf
);
2560 btrfs_set_root_dirid(&root_item
, new_dirid
);
2562 key
.objectid
= objectid
;
2564 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
2565 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
2571 * insert the directory item
2573 key
.offset
= (u64
)-1;
2574 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
2575 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
2576 name
, namelen
, dir
->i_ino
, &key
,
2581 ret
= btrfs_insert_inode_ref(trans
, root
->fs_info
->tree_root
,
2582 name
, namelen
, objectid
,
2583 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
);
2587 ret
= btrfs_commit_transaction(trans
, root
);
2591 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
2594 trans
= btrfs_start_transaction(new_root
, 1);
2597 inode
= btrfs_new_inode(trans
, new_root
, "..", 2, new_dirid
,
2599 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
2602 inode
->i_op
= &btrfs_dir_inode_operations
;
2603 inode
->i_fop
= &btrfs_dir_file_operations
;
2604 new_root
->inode
= inode
;
2606 ret
= btrfs_insert_inode_ref(trans
, new_root
, "..", 2, new_dirid
,
2610 ret
= btrfs_update_inode(trans
, new_root
, inode
);
2614 nr
= trans
->blocks_used
;
2615 err
= btrfs_commit_transaction(trans
, new_root
);
2619 mutex_unlock(&root
->fs_info
->fs_mutex
);
2620 btrfs_btree_balance_dirty(root
, nr
);
2621 btrfs_throttle(root
);
2625 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
2627 struct btrfs_pending_snapshot
*pending_snapshot
;
2628 struct btrfs_trans_handle
*trans
;
2631 unsigned long nr
= 0;
2633 if (!root
->ref_cows
)
2636 mutex_lock(&root
->fs_info
->fs_mutex
);
2637 ret
= btrfs_check_free_space(root
, 1, 0);
2641 pending_snapshot
= kmalloc(sizeof(*pending_snapshot
), GFP_NOFS
);
2642 if (!pending_snapshot
) {
2646 pending_snapshot
->name
= kmalloc(namelen
+ 1, GFP_NOFS
);
2647 if (!pending_snapshot
->name
) {
2649 kfree(pending_snapshot
);
2652 memcpy(pending_snapshot
->name
, name
, namelen
);
2653 pending_snapshot
->name
[namelen
] = '\0';
2654 trans
= btrfs_start_transaction(root
, 1);
2656 pending_snapshot
->root
= root
;
2657 list_add(&pending_snapshot
->list
,
2658 &trans
->transaction
->pending_snapshots
);
2659 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
2660 err
= btrfs_commit_transaction(trans
, root
);
2663 mutex_unlock(&root
->fs_info
->fs_mutex
);
2664 btrfs_btree_balance_dirty(root
, nr
);
2665 btrfs_throttle(root
);
2669 unsigned long btrfs_force_ra(struct address_space
*mapping
,
2670 struct file_ra_state
*ra
, struct file
*file
,
2671 pgoff_t offset
, pgoff_t last_index
)
2675 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2676 req_size
= last_index
- offset
+ 1;
2677 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
2680 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
2681 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
2682 return offset
+ req_size
;
2686 int btrfs_defrag_file(struct file
*file
) {
2687 struct inode
*inode
= fdentry(file
)->d_inode
;
2688 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2689 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2691 unsigned long last_index
;
2692 unsigned long ra_index
= 0;
2698 mutex_lock(&root
->fs_info
->fs_mutex
);
2699 ret
= btrfs_check_free_space(root
, inode
->i_size
, 0);
2700 mutex_unlock(&root
->fs_info
->fs_mutex
);
2704 mutex_lock(&inode
->i_mutex
);
2705 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
2706 for (i
= 0; i
<= last_index
; i
++) {
2707 if (i
== ra_index
) {
2708 ra_index
= btrfs_force_ra(inode
->i_mapping
,
2710 file
, ra_index
, last_index
);
2712 page
= grab_cache_page(inode
->i_mapping
, i
);
2715 if (!PageUptodate(page
)) {
2716 btrfs_readpage(NULL
, page
);
2718 if (!PageUptodate(page
)) {
2720 page_cache_release(page
);
2724 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2725 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2727 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2728 set_extent_delalloc(io_tree
, page_start
,
2729 page_end
, GFP_NOFS
);
2731 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2732 set_page_dirty(page
);
2734 page_cache_release(page
);
2735 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
2739 mutex_unlock(&inode
->i_mutex
);
2743 static int btrfs_ioctl_resize(struct btrfs_root
*root
, void __user
*arg
)
2747 struct btrfs_ioctl_vol_args
*vol_args
;
2748 struct btrfs_trans_handle
*trans
;
2754 vol_args
= kmalloc(sizeof(*vol_args
), GFP_NOFS
);
2759 if (copy_from_user(vol_args
, arg
, sizeof(*vol_args
))) {
2763 namelen
= strlen(vol_args
->name
);
2764 if (namelen
> BTRFS_VOL_NAME_MAX
) {
2769 sizestr
= vol_args
->name
;
2770 if (!strcmp(sizestr
, "max"))
2771 new_size
= root
->fs_info
->sb
->s_bdev
->bd_inode
->i_size
;
2773 if (sizestr
[0] == '-') {
2776 } else if (sizestr
[0] == '+') {
2780 new_size
= btrfs_parse_size(sizestr
);
2781 if (new_size
== 0) {
2787 mutex_lock(&root
->fs_info
->fs_mutex
);
2788 old_size
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
2791 if (new_size
> old_size
) {
2795 new_size
= old_size
- new_size
;
2796 } else if (mod
> 0) {
2797 new_size
= old_size
+ new_size
;
2800 if (new_size
< 256 * 1024 * 1024) {
2804 if (new_size
> root
->fs_info
->sb
->s_bdev
->bd_inode
->i_size
) {
2809 do_div(new_size
, root
->sectorsize
);
2810 new_size
*= root
->sectorsize
;
2812 printk("new size is %Lu\n", new_size
);
2813 if (new_size
> old_size
) {
2814 trans
= btrfs_start_transaction(root
, 1);
2815 ret
= btrfs_grow_extent_tree(trans
, root
, new_size
);
2816 btrfs_commit_transaction(trans
, root
);
2818 ret
= btrfs_shrink_extent_tree(root
, new_size
);
2822 mutex_unlock(&root
->fs_info
->fs_mutex
);
2828 static int noinline
btrfs_ioctl_snap_create(struct btrfs_root
*root
,
2831 struct btrfs_ioctl_vol_args
*vol_args
;
2832 struct btrfs_dir_item
*di
;
2833 struct btrfs_path
*path
;
2838 vol_args
= kmalloc(sizeof(*vol_args
), GFP_NOFS
);
2843 if (copy_from_user(vol_args
, arg
, sizeof(*vol_args
))) {
2848 namelen
= strlen(vol_args
->name
);
2849 if (namelen
> BTRFS_VOL_NAME_MAX
) {
2853 if (strchr(vol_args
->name
, '/')) {
2858 path
= btrfs_alloc_path();
2864 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2865 mutex_lock(&root
->fs_info
->fs_mutex
);
2866 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2868 vol_args
->name
, namelen
, 0);
2869 mutex_unlock(&root
->fs_info
->fs_mutex
);
2870 btrfs_free_path(path
);
2872 if (di
&& !IS_ERR(di
)) {
2882 if (root
== root
->fs_info
->tree_root
)
2883 ret
= create_subvol(root
, vol_args
->name
, namelen
);
2885 ret
= create_snapshot(root
, vol_args
->name
, namelen
);
2891 static int btrfs_ioctl_defrag(struct file
*file
)
2893 struct inode
*inode
= fdentry(file
)->d_inode
;
2894 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2896 switch (inode
->i_mode
& S_IFMT
) {
2898 mutex_lock(&root
->fs_info
->fs_mutex
);
2899 btrfs_defrag_root(root
, 0);
2900 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2901 mutex_unlock(&root
->fs_info
->fs_mutex
);
2904 btrfs_defrag_file(file
);
2911 long btrfs_ioctl(struct file
*file
, unsigned int
2912 cmd
, unsigned long arg
)
2914 struct btrfs_root
*root
= BTRFS_I(fdentry(file
)->d_inode
)->root
;
2917 case BTRFS_IOC_SNAP_CREATE
:
2918 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2919 case BTRFS_IOC_DEFRAG
:
2920 return btrfs_ioctl_defrag(file
);
2921 case BTRFS_IOC_RESIZE
:
2922 return btrfs_ioctl_resize(root
, (void __user
*)arg
);
2929 * Called inside transaction, so use GFP_NOFS
2931 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2933 struct btrfs_inode
*ei
;
2935 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2939 ei
->ordered_trans
= 0;
2940 return &ei
->vfs_inode
;
2943 void btrfs_destroy_inode(struct inode
*inode
)
2945 WARN_ON(!list_empty(&inode
->i_dentry
));
2946 WARN_ON(inode
->i_data
.nrpages
);
2948 btrfs_drop_extent_cache(inode
, 0, (u64
)-1);
2949 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2952 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2953 static void init_once(struct kmem_cache
* cachep
, void *foo
)
2955 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2956 unsigned long flags
)
2959 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2961 inode_init_once(&ei
->vfs_inode
);
2964 void btrfs_destroy_cachep(void)
2966 if (btrfs_inode_cachep
)
2967 kmem_cache_destroy(btrfs_inode_cachep
);
2968 if (btrfs_trans_handle_cachep
)
2969 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2970 if (btrfs_transaction_cachep
)
2971 kmem_cache_destroy(btrfs_transaction_cachep
);
2972 if (btrfs_bit_radix_cachep
)
2973 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2974 if (btrfs_path_cachep
)
2975 kmem_cache_destroy(btrfs_path_cachep
);
2978 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2979 unsigned long extra_flags
,
2980 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2981 void (*ctor
)(struct kmem_cache
*, void *)
2983 void (*ctor
)(void *, struct kmem_cache
*,
2988 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2989 SLAB_MEM_SPREAD
| extra_flags
), ctor
2990 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2996 int btrfs_init_cachep(void)
2998 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2999 sizeof(struct btrfs_inode
),
3001 if (!btrfs_inode_cachep
)
3003 btrfs_trans_handle_cachep
=
3004 btrfs_cache_create("btrfs_trans_handle_cache",
3005 sizeof(struct btrfs_trans_handle
),
3007 if (!btrfs_trans_handle_cachep
)
3009 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
3010 sizeof(struct btrfs_transaction
),
3012 if (!btrfs_transaction_cachep
)
3014 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
3015 sizeof(struct btrfs_path
),
3017 if (!btrfs_path_cachep
)
3019 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
3020 SLAB_DESTROY_BY_RCU
, NULL
);
3021 if (!btrfs_bit_radix_cachep
)
3025 btrfs_destroy_cachep();
3029 static int btrfs_getattr(struct vfsmount
*mnt
,
3030 struct dentry
*dentry
, struct kstat
*stat
)
3032 struct inode
*inode
= dentry
->d_inode
;
3033 generic_fillattr(inode
, stat
);
3034 stat
->blksize
= PAGE_CACHE_SIZE
;
3035 stat
->blocks
= inode
->i_blocks
+ (BTRFS_I(inode
)->delalloc_bytes
>> 9);
3039 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
3040 struct inode
* new_dir
,struct dentry
*new_dentry
)
3042 struct btrfs_trans_handle
*trans
;
3043 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
3044 struct inode
*new_inode
= new_dentry
->d_inode
;
3045 struct inode
*old_inode
= old_dentry
->d_inode
;
3046 struct timespec ctime
= CURRENT_TIME
;
3047 struct btrfs_path
*path
;
3050 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
3051 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
3055 mutex_lock(&root
->fs_info
->fs_mutex
);
3056 ret
= btrfs_check_free_space(root
, 1, 0);
3060 trans
= btrfs_start_transaction(root
, 1);
3062 btrfs_set_trans_block_group(trans
, new_dir
);
3063 path
= btrfs_alloc_path();
3069 old_dentry
->d_inode
->i_nlink
++;
3070 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
3071 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
3072 old_inode
->i_ctime
= ctime
;
3074 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
3079 new_inode
->i_ctime
= CURRENT_TIME
;
3080 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
3084 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
, 1);
3089 btrfs_free_path(path
);
3090 btrfs_end_transaction(trans
, root
);
3092 mutex_unlock(&root
->fs_info
->fs_mutex
);
3096 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
3097 const char *symname
)
3099 struct btrfs_trans_handle
*trans
;
3100 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3101 struct btrfs_path
*path
;
3102 struct btrfs_key key
;
3103 struct inode
*inode
= NULL
;
3110 struct btrfs_file_extent_item
*ei
;
3111 struct extent_buffer
*leaf
;
3112 unsigned long nr
= 0;
3114 name_len
= strlen(symname
) + 1;
3115 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
3116 return -ENAMETOOLONG
;
3118 mutex_lock(&root
->fs_info
->fs_mutex
);
3119 err
= btrfs_check_free_space(root
, 1, 0);
3123 trans
= btrfs_start_transaction(root
, 1);
3124 btrfs_set_trans_block_group(trans
, dir
);
3126 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
3132 inode
= btrfs_new_inode(trans
, root
, dentry
->d_name
.name
,
3134 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
3135 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
3136 err
= PTR_ERR(inode
);
3140 btrfs_set_trans_block_group(trans
, inode
);
3141 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0);
3145 inode
->i_mapping
->a_ops
= &btrfs_aops
;
3146 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
3147 inode
->i_fop
= &btrfs_file_operations
;
3148 inode
->i_op
= &btrfs_file_inode_operations
;
3149 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
3150 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
3151 inode
->i_mapping
, GFP_NOFS
);
3152 extent_io_tree_init(&BTRFS_I(inode
)->io_failure_tree
,
3153 inode
->i_mapping
, GFP_NOFS
);
3154 BTRFS_I(inode
)->delalloc_bytes
= 0;
3155 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
3157 dir
->i_sb
->s_dirt
= 1;
3158 btrfs_update_inode_block_group(trans
, inode
);
3159 btrfs_update_inode_block_group(trans
, dir
);
3163 path
= btrfs_alloc_path();
3165 key
.objectid
= inode
->i_ino
;
3167 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
3168 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
3169 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
3175 leaf
= path
->nodes
[0];
3176 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
3177 struct btrfs_file_extent_item
);
3178 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
3179 btrfs_set_file_extent_type(leaf
, ei
,
3180 BTRFS_FILE_EXTENT_INLINE
);
3181 ptr
= btrfs_file_extent_inline_start(ei
);
3182 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
3183 btrfs_mark_buffer_dirty(leaf
);
3184 btrfs_free_path(path
);
3186 inode
->i_op
= &btrfs_symlink_inode_operations
;
3187 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
3188 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
3189 inode
->i_size
= name_len
- 1;
3190 err
= btrfs_update_inode(trans
, root
, inode
);
3195 nr
= trans
->blocks_used
;
3196 btrfs_end_transaction(trans
, root
);
3198 mutex_unlock(&root
->fs_info
->fs_mutex
);
3200 inode_dec_link_count(inode
);
3203 btrfs_btree_balance_dirty(root
, nr
);
3204 btrfs_throttle(root
);
3208 static int btrfs_permission(struct inode
*inode
, int mask
,
3209 struct nameidata
*nd
)
3211 if (btrfs_test_flag(inode
, READONLY
) && (mask
& MAY_WRITE
))
3213 return generic_permission(inode
, mask
, NULL
);
3216 static struct inode_operations btrfs_dir_inode_operations
= {
3217 .lookup
= btrfs_lookup
,
3218 .create
= btrfs_create
,
3219 .unlink
= btrfs_unlink
,
3221 .mkdir
= btrfs_mkdir
,
3222 .rmdir
= btrfs_rmdir
,
3223 .rename
= btrfs_rename
,
3224 .symlink
= btrfs_symlink
,
3225 .setattr
= btrfs_setattr
,
3226 .mknod
= btrfs_mknod
,
3227 .setxattr
= generic_setxattr
,
3228 .getxattr
= generic_getxattr
,
3229 .listxattr
= btrfs_listxattr
,
3230 .removexattr
= generic_removexattr
,
3231 .permission
= btrfs_permission
,
3233 static struct inode_operations btrfs_dir_ro_inode_operations
= {
3234 .lookup
= btrfs_lookup
,
3235 .permission
= btrfs_permission
,
3237 static struct file_operations btrfs_dir_file_operations
= {
3238 .llseek
= generic_file_llseek
,
3239 .read
= generic_read_dir
,
3240 .readdir
= btrfs_readdir
,
3241 .unlocked_ioctl
= btrfs_ioctl
,
3242 #ifdef CONFIG_COMPAT
3243 .compat_ioctl
= btrfs_ioctl
,
3247 static struct extent_io_ops btrfs_extent_io_ops
= {
3248 .fill_delalloc
= run_delalloc_range
,
3249 .submit_bio_hook
= btrfs_submit_bio_hook
,
3250 .merge_bio_hook
= btrfs_merge_bio_hook
,
3251 .readpage_io_hook
= btrfs_readpage_io_hook
,
3252 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
3253 .readpage_io_failed_hook
= btrfs_readpage_io_failed_hook
,
3254 .set_bit_hook
= btrfs_set_bit_hook
,
3255 .clear_bit_hook
= btrfs_clear_bit_hook
,
3258 static struct address_space_operations btrfs_aops
= {
3259 .readpage
= btrfs_readpage
,
3260 .writepage
= btrfs_writepage
,
3261 .writepages
= btrfs_writepages
,
3262 .readpages
= btrfs_readpages
,
3263 .sync_page
= block_sync_page
,
3265 .direct_IO
= btrfs_direct_IO
,
3266 .invalidatepage
= btrfs_invalidatepage
,
3267 .releasepage
= btrfs_releasepage
,
3268 .set_page_dirty
= __set_page_dirty_nobuffers
,
3271 static struct address_space_operations btrfs_symlink_aops
= {
3272 .readpage
= btrfs_readpage
,
3273 .writepage
= btrfs_writepage
,
3274 .invalidatepage
= btrfs_invalidatepage
,
3275 .releasepage
= btrfs_releasepage
,
3278 static struct inode_operations btrfs_file_inode_operations
= {
3279 .truncate
= btrfs_truncate
,
3280 .getattr
= btrfs_getattr
,
3281 .setattr
= btrfs_setattr
,
3282 .setxattr
= generic_setxattr
,
3283 .getxattr
= generic_getxattr
,
3284 .listxattr
= btrfs_listxattr
,
3285 .removexattr
= generic_removexattr
,
3286 .permission
= btrfs_permission
,
3288 static struct inode_operations btrfs_special_inode_operations
= {
3289 .getattr
= btrfs_getattr
,
3290 .setattr
= btrfs_setattr
,
3291 .permission
= btrfs_permission
,
3293 static struct inode_operations btrfs_symlink_inode_operations
= {
3294 .readlink
= generic_readlink
,
3295 .follow_link
= page_follow_link_light
,
3296 .put_link
= page_put_link
,
3297 .permission
= btrfs_permission
,