2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/kernel.h>
20 #include <linux/bio.h>
21 #include <linux/buffer_head.h>
22 #include <linux/file.h>
24 #include <linux/pagemap.h>
25 #include <linux/highmem.h>
26 #include <linux/time.h>
27 #include <linux/init.h>
28 #include <linux/string.h>
29 #include <linux/smp_lock.h>
30 #include <linux/backing-dev.h>
31 #include <linux/mpage.h>
32 #include <linux/swap.h>
33 #include <linux/writeback.h>
34 #include <linux/statfs.h>
35 #include <linux/compat.h>
36 #include <linux/bit_spinlock.h>
37 #include <linux/version.h>
38 #include <linux/xattr.h>
39 #include <linux/posix_acl.h>
42 #include "transaction.h"
43 #include "btrfs_inode.h"
45 #include "print-tree.h"
47 #include "ordered-data.h"
49 struct btrfs_iget_args
{
51 struct btrfs_root
*root
;
54 static struct inode_operations btrfs_dir_inode_operations
;
55 static struct inode_operations btrfs_symlink_inode_operations
;
56 static struct inode_operations btrfs_dir_ro_inode_operations
;
57 static struct inode_operations btrfs_special_inode_operations
;
58 static struct inode_operations btrfs_file_inode_operations
;
59 static struct address_space_operations btrfs_aops
;
60 static struct address_space_operations btrfs_symlink_aops
;
61 static struct file_operations btrfs_dir_file_operations
;
62 static struct extent_io_ops btrfs_extent_io_ops
;
64 static struct kmem_cache
*btrfs_inode_cachep
;
65 struct kmem_cache
*btrfs_trans_handle_cachep
;
66 struct kmem_cache
*btrfs_transaction_cachep
;
67 struct kmem_cache
*btrfs_bit_radix_cachep
;
68 struct kmem_cache
*btrfs_path_cachep
;
71 static unsigned char btrfs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
72 [S_IFREG
>> S_SHIFT
] = BTRFS_FT_REG_FILE
,
73 [S_IFDIR
>> S_SHIFT
] = BTRFS_FT_DIR
,
74 [S_IFCHR
>> S_SHIFT
] = BTRFS_FT_CHRDEV
,
75 [S_IFBLK
>> S_SHIFT
] = BTRFS_FT_BLKDEV
,
76 [S_IFIFO
>> S_SHIFT
] = BTRFS_FT_FIFO
,
77 [S_IFSOCK
>> S_SHIFT
] = BTRFS_FT_SOCK
,
78 [S_IFLNK
>> S_SHIFT
] = BTRFS_FT_SYMLINK
,
81 static void btrfs_truncate(struct inode
*inode
);
83 int btrfs_check_free_space(struct btrfs_root
*root
, u64 num_required
,
92 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
93 total
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
94 used
= btrfs_super_bytes_used(&root
->fs_info
->super_copy
);
102 if (used
+ root
->fs_info
->delalloc_bytes
+ num_required
> thresh
)
104 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
108 static int cow_file_range(struct inode
*inode
, u64 start
, u64 end
)
110 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
111 struct btrfs_trans_handle
*trans
;
115 u64 blocksize
= root
->sectorsize
;
117 struct btrfs_key ins
;
118 struct extent_map
*em
;
119 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
122 trans
= btrfs_join_transaction(root
, 1);
124 btrfs_set_trans_block_group(trans
, inode
);
126 num_bytes
= (end
- start
+ blocksize
) & ~(blocksize
- 1);
127 num_bytes
= max(blocksize
, num_bytes
);
128 orig_num_bytes
= num_bytes
;
130 if (alloc_hint
== EXTENT_MAP_INLINE
)
133 BUG_ON(num_bytes
> btrfs_super_total_bytes(&root
->fs_info
->super_copy
));
134 mutex_lock(&BTRFS_I(inode
)->extent_mutex
);
135 btrfs_drop_extent_cache(inode
, start
, start
+ num_bytes
- 1);
136 mutex_unlock(&BTRFS_I(inode
)->extent_mutex
);
138 while(num_bytes
> 0) {
139 cur_alloc_size
= min(num_bytes
, root
->fs_info
->max_extent
);
140 ret
= btrfs_reserve_extent(trans
, root
, cur_alloc_size
,
141 root
->sectorsize
, 0, 0,
147 em
= alloc_extent_map(GFP_NOFS
);
149 em
->len
= ins
.offset
;
150 em
->block_start
= ins
.objectid
;
151 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
152 mutex_lock(&BTRFS_I(inode
)->extent_mutex
);
153 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
155 spin_lock(&em_tree
->lock
);
156 ret
= add_extent_mapping(em_tree
, em
);
157 spin_unlock(&em_tree
->lock
);
158 if (ret
!= -EEXIST
) {
162 btrfs_drop_extent_cache(inode
, start
,
163 start
+ ins
.offset
- 1);
165 mutex_unlock(&BTRFS_I(inode
)->extent_mutex
);
167 cur_alloc_size
= ins
.offset
;
168 ret
= btrfs_add_ordered_extent(inode
, start
, ins
.objectid
,
171 if (num_bytes
< cur_alloc_size
) {
172 printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes
,
176 num_bytes
-= cur_alloc_size
;
177 alloc_hint
= ins
.objectid
+ ins
.offset
;
178 start
+= cur_alloc_size
;
181 btrfs_end_transaction(trans
, root
);
185 static int run_delalloc_nocow(struct inode
*inode
, u64 start
, u64 end
)
192 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
193 struct btrfs_block_group_cache
*block_group
;
194 struct btrfs_trans_handle
*trans
;
195 struct extent_buffer
*leaf
;
197 struct btrfs_path
*path
;
198 struct btrfs_file_extent_item
*item
;
201 struct btrfs_key found_key
;
203 total_fs_bytes
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
204 path
= btrfs_alloc_path();
206 trans
= btrfs_join_transaction(root
, 1);
209 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
210 inode
->i_ino
, start
, 0);
217 if (path
->slots
[0] == 0)
222 leaf
= path
->nodes
[0];
223 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
224 struct btrfs_file_extent_item
);
226 /* are we inside the extent that was found? */
227 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
228 found_type
= btrfs_key_type(&found_key
);
229 if (found_key
.objectid
!= inode
->i_ino
||
230 found_type
!= BTRFS_EXTENT_DATA_KEY
)
233 found_type
= btrfs_file_extent_type(leaf
, item
);
234 extent_start
= found_key
.offset
;
235 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
236 u64 extent_num_bytes
;
238 extent_num_bytes
= btrfs_file_extent_num_bytes(leaf
, item
);
239 extent_end
= extent_start
+ extent_num_bytes
;
242 if (loops
&& start
!= extent_start
)
245 if (start
< extent_start
|| start
>= extent_end
)
248 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
252 if (btrfs_cross_ref_exists(trans
, root
, &found_key
, bytenr
))
255 * we may be called by the resizer, make sure we're inside
256 * the limits of the FS
258 block_group
= btrfs_lookup_block_group(root
->fs_info
,
260 if (!block_group
|| block_group
->ro
)
263 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
264 extent_num_bytes
= min(end
+ 1, extent_end
) - start
;
265 ret
= btrfs_add_ordered_extent(inode
, start
, bytenr
,
266 extent_num_bytes
, 1);
272 btrfs_release_path(root
, path
);
280 btrfs_end_transaction(trans
, root
);
281 btrfs_free_path(path
);
282 return cow_file_range(inode
, start
, end
);
286 btrfs_end_transaction(trans
, root
);
287 btrfs_free_path(path
);
291 static int run_delalloc_range(struct inode
*inode
, u64 start
, u64 end
)
293 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
296 if (btrfs_test_opt(root
, NODATACOW
) ||
297 btrfs_test_flag(inode
, NODATACOW
))
298 ret
= run_delalloc_nocow(inode
, start
, end
);
300 ret
= cow_file_range(inode
, start
, end
);
305 int btrfs_set_bit_hook(struct inode
*inode
, u64 start
, u64 end
,
306 unsigned long old
, unsigned long bits
)
309 if (!(old
& EXTENT_DELALLOC
) && (bits
& EXTENT_DELALLOC
)) {
310 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
311 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
312 BTRFS_I(inode
)->delalloc_bytes
+= end
- start
+ 1;
313 root
->fs_info
->delalloc_bytes
+= end
- start
+ 1;
314 if (list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
315 list_add_tail(&BTRFS_I(inode
)->delalloc_inodes
,
316 &root
->fs_info
->delalloc_inodes
);
318 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
323 int btrfs_clear_bit_hook(struct inode
*inode
, u64 start
, u64 end
,
324 unsigned long old
, unsigned long bits
)
326 if ((old
& EXTENT_DELALLOC
) && (bits
& EXTENT_DELALLOC
)) {
327 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
330 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
331 if (end
- start
+ 1 > root
->fs_info
->delalloc_bytes
) {
332 printk("warning: delalloc account %Lu %Lu\n",
333 end
- start
+ 1, root
->fs_info
->delalloc_bytes
);
334 root
->fs_info
->delalloc_bytes
= 0;
335 BTRFS_I(inode
)->delalloc_bytes
= 0;
337 root
->fs_info
->delalloc_bytes
-= end
- start
+ 1;
338 BTRFS_I(inode
)->delalloc_bytes
-= end
- start
+ 1;
340 if (BTRFS_I(inode
)->delalloc_bytes
== 0 &&
341 !list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
342 list_del_init(&BTRFS_I(inode
)->delalloc_inodes
);
344 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
349 int btrfs_merge_bio_hook(struct page
*page
, unsigned long offset
,
350 size_t size
, struct bio
*bio
)
352 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
353 struct btrfs_mapping_tree
*map_tree
;
354 u64 logical
= bio
->bi_sector
<< 9;
359 length
= bio
->bi_size
;
360 map_tree
= &root
->fs_info
->mapping_tree
;
362 ret
= btrfs_map_block(map_tree
, READ
, logical
,
363 &map_length
, NULL
, 0);
365 if (map_length
< length
+ size
) {
371 int __btrfs_submit_bio_hook(struct inode
*inode
, int rw
, struct bio
*bio
,
374 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
377 ret
= btrfs_csum_one_bio(root
, inode
, bio
);
380 return btrfs_map_bio(root
, rw
, bio
, mirror_num
, 1);
383 int btrfs_submit_bio_hook(struct inode
*inode
, int rw
, struct bio
*bio
,
386 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
389 ret
= btrfs_bio_wq_end_io(root
->fs_info
, bio
, 0);
392 if (btrfs_test_opt(root
, NODATASUM
) ||
393 btrfs_test_flag(inode
, NODATASUM
)) {
397 if (!(rw
& (1 << BIO_RW
))) {
398 btrfs_lookup_bio_sums(root
, inode
, bio
);
401 return btrfs_wq_submit_bio(BTRFS_I(inode
)->root
->fs_info
,
402 inode
, rw
, bio
, mirror_num
,
403 __btrfs_submit_bio_hook
);
405 return btrfs_map_bio(root
, rw
, bio
, mirror_num
, 0);
408 static noinline
int add_pending_csums(struct btrfs_trans_handle
*trans
,
409 struct inode
*inode
, u64 file_offset
,
410 struct list_head
*list
)
412 struct list_head
*cur
;
413 struct btrfs_ordered_sum
*sum
;
415 btrfs_set_trans_block_group(trans
, inode
);
416 list_for_each(cur
, list
) {
417 sum
= list_entry(cur
, struct btrfs_ordered_sum
, list
);
418 btrfs_csum_file_blocks(trans
, BTRFS_I(inode
)->root
,
424 int btrfs_set_extent_delalloc(struct inode
*inode
, u64 start
, u64 end
)
426 return set_extent_delalloc(&BTRFS_I(inode
)->io_tree
, start
, end
,
430 struct btrfs_writepage_fixup
{
432 struct btrfs_work work
;
435 /* see btrfs_writepage_start_hook for details on why this is required */
436 void btrfs_writepage_fixup_worker(struct btrfs_work
*work
)
438 struct btrfs_writepage_fixup
*fixup
;
439 struct btrfs_ordered_extent
*ordered
;
445 fixup
= container_of(work
, struct btrfs_writepage_fixup
, work
);
449 if (!page
->mapping
|| !PageDirty(page
) || !PageChecked(page
)) {
450 ClearPageChecked(page
);
454 inode
= page
->mapping
->host
;
455 page_start
= page_offset(page
);
456 page_end
= page_offset(page
) + PAGE_CACHE_SIZE
- 1;
458 lock_extent(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
, GFP_NOFS
);
460 /* already ordered? We're done */
461 if (test_range_bit(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
,
462 EXTENT_ORDERED
, 0)) {
466 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
468 unlock_extent(&BTRFS_I(inode
)->io_tree
, page_start
,
471 btrfs_start_ordered_extent(inode
, ordered
, 1);
475 btrfs_set_extent_delalloc(inode
, page_start
, page_end
);
476 ClearPageChecked(page
);
478 unlock_extent(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
, GFP_NOFS
);
481 page_cache_release(page
);
485 * There are a few paths in the higher layers of the kernel that directly
486 * set the page dirty bit without asking the filesystem if it is a
487 * good idea. This causes problems because we want to make sure COW
488 * properly happens and the data=ordered rules are followed.
490 * In our case any range that doesn't have the EXTENT_ORDERED bit set
491 * hasn't been properly setup for IO. We kick off an async process
492 * to fix it up. The async helper will wait for ordered extents, set
493 * the delalloc bit and make it safe to write the page.
495 int btrfs_writepage_start_hook(struct page
*page
, u64 start
, u64 end
)
497 struct inode
*inode
= page
->mapping
->host
;
498 struct btrfs_writepage_fixup
*fixup
;
499 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
502 ret
= test_range_bit(&BTRFS_I(inode
)->io_tree
, start
, end
,
507 if (PageChecked(page
))
510 fixup
= kzalloc(sizeof(*fixup
), GFP_NOFS
);
514 SetPageChecked(page
);
515 page_cache_get(page
);
516 fixup
->work
.func
= btrfs_writepage_fixup_worker
;
518 btrfs_queue_worker(&root
->fs_info
->fixup_workers
, &fixup
->work
);
522 static int btrfs_finish_ordered_io(struct inode
*inode
, u64 start
, u64 end
)
524 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
525 struct btrfs_trans_handle
*trans
;
526 struct btrfs_ordered_extent
*ordered_extent
;
527 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
529 struct list_head list
;
530 struct btrfs_key ins
;
533 ret
= btrfs_dec_test_ordered_pending(inode
, start
, end
- start
+ 1);
537 trans
= btrfs_join_transaction(root
, 1);
539 ordered_extent
= btrfs_lookup_ordered_extent(inode
, start
);
540 BUG_ON(!ordered_extent
);
541 if (test_bit(BTRFS_ORDERED_NOCOW
, &ordered_extent
->flags
))
544 lock_extent(io_tree
, ordered_extent
->file_offset
,
545 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
548 INIT_LIST_HEAD(&list
);
550 ins
.objectid
= ordered_extent
->start
;
551 ins
.offset
= ordered_extent
->len
;
552 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
554 ret
= btrfs_alloc_reserved_extent(trans
, root
, root
->root_key
.objectid
,
555 trans
->transid
, inode
->i_ino
,
556 ordered_extent
->file_offset
, &ins
);
559 mutex_lock(&BTRFS_I(inode
)->extent_mutex
);
561 ret
= btrfs_drop_extents(trans
, root
, inode
,
562 ordered_extent
->file_offset
,
563 ordered_extent
->file_offset
+
565 ordered_extent
->file_offset
, &alloc_hint
);
567 ret
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
568 ordered_extent
->file_offset
,
569 ordered_extent
->start
,
571 ordered_extent
->len
, 0);
574 btrfs_drop_extent_cache(inode
, ordered_extent
->file_offset
,
575 ordered_extent
->file_offset
+
576 ordered_extent
->len
- 1);
577 mutex_unlock(&BTRFS_I(inode
)->extent_mutex
);
579 inode
->i_blocks
+= ordered_extent
->len
>> 9;
580 unlock_extent(io_tree
, ordered_extent
->file_offset
,
581 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
584 add_pending_csums(trans
, inode
, ordered_extent
->file_offset
,
585 &ordered_extent
->list
);
587 btrfs_ordered_update_i_size(inode
, ordered_extent
);
588 btrfs_remove_ordered_extent(inode
, ordered_extent
);
591 btrfs_put_ordered_extent(ordered_extent
);
592 /* once for the tree */
593 btrfs_put_ordered_extent(ordered_extent
);
595 btrfs_update_inode(trans
, root
, inode
);
596 btrfs_end_transaction(trans
, root
);
600 int btrfs_writepage_end_io_hook(struct page
*page
, u64 start
, u64 end
,
601 struct extent_state
*state
, int uptodate
)
603 return btrfs_finish_ordered_io(page
->mapping
->host
, start
, end
);
606 struct io_failure_record
{
614 int btrfs_io_failed_hook(struct bio
*failed_bio
,
615 struct page
*page
, u64 start
, u64 end
,
616 struct extent_state
*state
)
618 struct io_failure_record
*failrec
= NULL
;
620 struct extent_map
*em
;
621 struct inode
*inode
= page
->mapping
->host
;
622 struct extent_io_tree
*failure_tree
= &BTRFS_I(inode
)->io_failure_tree
;
623 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
630 ret
= get_state_private(failure_tree
, start
, &private);
632 failrec
= kmalloc(sizeof(*failrec
), GFP_NOFS
);
635 failrec
->start
= start
;
636 failrec
->len
= end
- start
+ 1;
637 failrec
->last_mirror
= 0;
639 spin_lock(&em_tree
->lock
);
640 em
= lookup_extent_mapping(em_tree
, start
, failrec
->len
);
641 if (em
->start
> start
|| em
->start
+ em
->len
< start
) {
645 spin_unlock(&em_tree
->lock
);
647 if (!em
|| IS_ERR(em
)) {
651 logical
= start
- em
->start
;
652 logical
= em
->block_start
+ logical
;
653 failrec
->logical
= logical
;
655 set_extent_bits(failure_tree
, start
, end
, EXTENT_LOCKED
|
656 EXTENT_DIRTY
, GFP_NOFS
);
657 set_state_private(failure_tree
, start
,
658 (u64
)(unsigned long)failrec
);
660 failrec
= (struct io_failure_record
*)(unsigned long)private;
662 num_copies
= btrfs_num_copies(
663 &BTRFS_I(inode
)->root
->fs_info
->mapping_tree
,
664 failrec
->logical
, failrec
->len
);
665 failrec
->last_mirror
++;
667 spin_lock_irq(&BTRFS_I(inode
)->io_tree
.lock
);
668 state
= find_first_extent_bit_state(&BTRFS_I(inode
)->io_tree
,
671 if (state
&& state
->start
!= failrec
->start
)
673 spin_unlock_irq(&BTRFS_I(inode
)->io_tree
.lock
);
675 if (!state
|| failrec
->last_mirror
> num_copies
) {
676 set_state_private(failure_tree
, failrec
->start
, 0);
677 clear_extent_bits(failure_tree
, failrec
->start
,
678 failrec
->start
+ failrec
->len
- 1,
679 EXTENT_LOCKED
| EXTENT_DIRTY
, GFP_NOFS
);
683 bio
= bio_alloc(GFP_NOFS
, 1);
684 bio
->bi_private
= state
;
685 bio
->bi_end_io
= failed_bio
->bi_end_io
;
686 bio
->bi_sector
= failrec
->logical
>> 9;
687 bio
->bi_bdev
= failed_bio
->bi_bdev
;
689 bio_add_page(bio
, page
, failrec
->len
, start
- page_offset(page
));
690 if (failed_bio
->bi_rw
& (1 << BIO_RW
))
695 BTRFS_I(inode
)->io_tree
.ops
->submit_bio_hook(inode
, rw
, bio
,
696 failrec
->last_mirror
);
700 int btrfs_clean_io_failures(struct inode
*inode
, u64 start
)
704 struct io_failure_record
*failure
;
708 if (count_range_bits(&BTRFS_I(inode
)->io_failure_tree
, &private,
709 (u64
)-1, 1, EXTENT_DIRTY
)) {
710 ret
= get_state_private(&BTRFS_I(inode
)->io_failure_tree
,
711 start
, &private_failure
);
713 failure
= (struct io_failure_record
*)(unsigned long)
715 set_state_private(&BTRFS_I(inode
)->io_failure_tree
,
717 clear_extent_bits(&BTRFS_I(inode
)->io_failure_tree
,
719 failure
->start
+ failure
->len
- 1,
720 EXTENT_DIRTY
| EXTENT_LOCKED
,
728 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
,
729 struct extent_state
*state
)
731 size_t offset
= start
- ((u64
)page
->index
<< PAGE_CACHE_SHIFT
);
732 struct inode
*inode
= page
->mapping
->host
;
733 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
735 u64
private = ~(u32
)0;
737 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
741 if (btrfs_test_opt(root
, NODATASUM
) ||
742 btrfs_test_flag(inode
, NODATASUM
))
744 if (state
&& state
->start
== start
) {
745 private = state
->private;
748 ret
= get_state_private(io_tree
, start
, &private);
750 local_irq_save(flags
);
751 kaddr
= kmap_atomic(page
, KM_IRQ0
);
755 csum
= btrfs_csum_data(root
, kaddr
+ offset
, csum
, end
- start
+ 1);
756 btrfs_csum_final(csum
, (char *)&csum
);
757 if (csum
!= private) {
760 kunmap_atomic(kaddr
, KM_IRQ0
);
761 local_irq_restore(flags
);
763 /* if the io failure tree for this inode is non-empty,
764 * check to see if we've recovered from a failed IO
766 btrfs_clean_io_failures(inode
, start
);
770 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
771 page
->mapping
->host
->i_ino
, (unsigned long long)start
, csum
,
773 memset(kaddr
+ offset
, 1, end
- start
+ 1);
774 flush_dcache_page(page
);
775 kunmap_atomic(kaddr
, KM_IRQ0
);
776 local_irq_restore(flags
);
783 * This creates an orphan entry for the given inode in case something goes
784 * wrong in the middle of an unlink/truncate.
786 int btrfs_orphan_add(struct btrfs_trans_handle
*trans
, struct inode
*inode
)
788 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
791 spin_lock(&root
->list_lock
);
793 /* already on the orphan list, we're good */
794 if (!list_empty(&BTRFS_I(inode
)->i_orphan
)) {
795 spin_unlock(&root
->list_lock
);
799 list_add(&BTRFS_I(inode
)->i_orphan
, &root
->orphan_list
);
801 spin_unlock(&root
->list_lock
);
804 * insert an orphan item to track this unlinked/truncated file
806 ret
= btrfs_insert_orphan_item(trans
, root
, inode
->i_ino
);
812 * We have done the truncate/delete so we can go ahead and remove the orphan
813 * item for this particular inode.
815 int btrfs_orphan_del(struct btrfs_trans_handle
*trans
, struct inode
*inode
)
817 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
820 spin_lock(&root
->list_lock
);
822 if (list_empty(&BTRFS_I(inode
)->i_orphan
)) {
823 spin_unlock(&root
->list_lock
);
827 list_del_init(&BTRFS_I(inode
)->i_orphan
);
829 spin_unlock(&root
->list_lock
);
833 spin_unlock(&root
->list_lock
);
835 ret
= btrfs_del_orphan_item(trans
, root
, inode
->i_ino
);
841 * this cleans up any orphans that may be left on the list from the last use
844 void btrfs_orphan_cleanup(struct btrfs_root
*root
)
846 struct btrfs_path
*path
;
847 struct extent_buffer
*leaf
;
848 struct btrfs_item
*item
;
849 struct btrfs_key key
, found_key
;
850 struct btrfs_trans_handle
*trans
;
852 int ret
= 0, nr_unlink
= 0, nr_truncate
= 0;
854 /* don't do orphan cleanup if the fs is readonly. */
855 if (root
->inode
->i_sb
->s_flags
& MS_RDONLY
)
858 path
= btrfs_alloc_path();
863 key
.objectid
= BTRFS_ORPHAN_OBJECTID
;
864 btrfs_set_key_type(&key
, BTRFS_ORPHAN_ITEM_KEY
);
865 key
.offset
= (u64
)-1;
867 trans
= btrfs_start_transaction(root
, 1);
868 btrfs_set_trans_block_group(trans
, root
->inode
);
871 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
873 printk(KERN_ERR
"Error searching slot for orphan: %d"
879 * if ret == 0 means we found what we were searching for, which
880 * is weird, but possible, so only screw with path if we didnt
881 * find the key and see if we have stuff that matches
884 if (path
->slots
[0] == 0)
889 /* pull out the item */
890 leaf
= path
->nodes
[0];
891 item
= btrfs_item_nr(leaf
, path
->slots
[0]);
892 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
894 /* make sure the item matches what we want */
895 if (found_key
.objectid
!= BTRFS_ORPHAN_OBJECTID
)
897 if (btrfs_key_type(&found_key
) != BTRFS_ORPHAN_ITEM_KEY
)
900 /* release the path since we're done with it */
901 btrfs_release_path(root
, path
);
904 * this is where we are basically btrfs_lookup, without the
905 * crossing root thing. we store the inode number in the
906 * offset of the orphan item.
908 inode
= btrfs_iget_locked(root
->inode
->i_sb
,
909 found_key
.offset
, root
);
913 if (inode
->i_state
& I_NEW
) {
914 BTRFS_I(inode
)->root
= root
;
916 /* have to set the location manually */
917 BTRFS_I(inode
)->location
.objectid
= inode
->i_ino
;
918 BTRFS_I(inode
)->location
.type
= BTRFS_INODE_ITEM_KEY
;
919 BTRFS_I(inode
)->location
.offset
= 0;
921 btrfs_read_locked_inode(inode
);
922 unlock_new_inode(inode
);
926 * add this inode to the orphan list so btrfs_orphan_del does
927 * the proper thing when we hit it
929 spin_lock(&root
->list_lock
);
930 list_add(&BTRFS_I(inode
)->i_orphan
, &root
->orphan_list
);
931 spin_unlock(&root
->list_lock
);
934 * if this is a bad inode, means we actually succeeded in
935 * removing the inode, but not the orphan record, which means
936 * we need to manually delete the orphan since iput will just
939 if (is_bad_inode(inode
)) {
940 btrfs_orphan_del(trans
, inode
);
945 /* if we have links, this was a truncate, lets do that */
946 if (inode
->i_nlink
) {
948 btrfs_truncate(inode
);
953 /* this will do delete_inode and everything for us */
958 printk(KERN_INFO
"btrfs: unlinked %d orphans\n", nr_unlink
);
960 printk(KERN_INFO
"btrfs: truncated %d orphans\n", nr_truncate
);
962 btrfs_free_path(path
);
963 btrfs_end_transaction(trans
, root
);
966 void btrfs_read_locked_inode(struct inode
*inode
)
968 struct btrfs_path
*path
;
969 struct extent_buffer
*leaf
;
970 struct btrfs_inode_item
*inode_item
;
971 struct btrfs_timespec
*tspec
;
972 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
973 struct btrfs_key location
;
974 u64 alloc_group_block
;
978 path
= btrfs_alloc_path();
980 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
982 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
986 leaf
= path
->nodes
[0];
987 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
988 struct btrfs_inode_item
);
990 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
991 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
992 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
993 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
994 btrfs_i_size_write(inode
, btrfs_inode_size(leaf
, inode_item
));
996 tspec
= btrfs_inode_atime(inode_item
);
997 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
998 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
1000 tspec
= btrfs_inode_mtime(inode_item
);
1001 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
1002 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
1004 tspec
= btrfs_inode_ctime(inode_item
);
1005 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
1006 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
1008 inode
->i_blocks
= btrfs_inode_nblocks(leaf
, inode_item
);
1009 inode
->i_generation
= btrfs_inode_generation(leaf
, inode_item
);
1011 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
1013 BTRFS_I(inode
)->index_cnt
= (u64
)-1;
1015 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
1016 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
1018 BTRFS_I(inode
)->flags
= btrfs_inode_flags(leaf
, inode_item
);
1019 if (!BTRFS_I(inode
)->block_group
) {
1020 BTRFS_I(inode
)->block_group
= btrfs_find_block_group(root
,
1022 BTRFS_BLOCK_GROUP_METADATA
, 0);
1024 btrfs_free_path(path
);
1027 switch (inode
->i_mode
& S_IFMT
) {
1029 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1030 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
1031 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
1032 inode
->i_fop
= &btrfs_file_operations
;
1033 inode
->i_op
= &btrfs_file_inode_operations
;
1036 inode
->i_fop
= &btrfs_dir_file_operations
;
1037 if (root
== root
->fs_info
->tree_root
)
1038 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
1040 inode
->i_op
= &btrfs_dir_inode_operations
;
1043 inode
->i_op
= &btrfs_symlink_inode_operations
;
1044 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
1045 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
1048 init_special_inode(inode
, inode
->i_mode
, rdev
);
1054 btrfs_free_path(path
);
1055 make_bad_inode(inode
);
1058 static void fill_inode_item(struct extent_buffer
*leaf
,
1059 struct btrfs_inode_item
*item
,
1060 struct inode
*inode
)
1062 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
1063 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
1064 btrfs_set_inode_size(leaf
, item
, BTRFS_I(inode
)->disk_i_size
);
1065 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
1066 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
1068 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
1069 inode
->i_atime
.tv_sec
);
1070 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
1071 inode
->i_atime
.tv_nsec
);
1073 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
1074 inode
->i_mtime
.tv_sec
);
1075 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
1076 inode
->i_mtime
.tv_nsec
);
1078 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
1079 inode
->i_ctime
.tv_sec
);
1080 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
1081 inode
->i_ctime
.tv_nsec
);
1083 btrfs_set_inode_nblocks(leaf
, item
, inode
->i_blocks
);
1084 btrfs_set_inode_generation(leaf
, item
, inode
->i_generation
);
1085 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
1086 btrfs_set_inode_flags(leaf
, item
, BTRFS_I(inode
)->flags
);
1087 btrfs_set_inode_block_group(leaf
, item
,
1088 BTRFS_I(inode
)->block_group
->key
.objectid
);
1091 int noinline
btrfs_update_inode(struct btrfs_trans_handle
*trans
,
1092 struct btrfs_root
*root
,
1093 struct inode
*inode
)
1095 struct btrfs_inode_item
*inode_item
;
1096 struct btrfs_path
*path
;
1097 struct extent_buffer
*leaf
;
1100 path
= btrfs_alloc_path();
1102 ret
= btrfs_lookup_inode(trans
, root
, path
,
1103 &BTRFS_I(inode
)->location
, 1);
1110 leaf
= path
->nodes
[0];
1111 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1112 struct btrfs_inode_item
);
1114 fill_inode_item(leaf
, inode_item
, inode
);
1115 btrfs_mark_buffer_dirty(leaf
);
1116 btrfs_set_inode_last_trans(trans
, inode
);
1119 btrfs_free_path(path
);
1124 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
1125 struct btrfs_root
*root
,
1127 struct dentry
*dentry
)
1129 struct btrfs_path
*path
;
1130 const char *name
= dentry
->d_name
.name
;
1131 int name_len
= dentry
->d_name
.len
;
1133 struct extent_buffer
*leaf
;
1134 struct btrfs_dir_item
*di
;
1135 struct btrfs_key key
;
1138 path
= btrfs_alloc_path();
1144 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
1145 name
, name_len
, -1);
1154 leaf
= path
->nodes
[0];
1155 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
1156 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
1159 btrfs_release_path(root
, path
);
1161 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
1162 dentry
->d_inode
->i_ino
,
1163 dentry
->d_parent
->d_inode
->i_ino
, &index
);
1165 printk("failed to delete reference to %.*s, "
1166 "inode %lu parent %lu\n", name_len
, name
,
1167 dentry
->d_inode
->i_ino
,
1168 dentry
->d_parent
->d_inode
->i_ino
);
1172 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
1173 index
, name
, name_len
, -1);
1182 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
1183 btrfs_release_path(root
, path
);
1185 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
1187 btrfs_free_path(path
);
1189 btrfs_i_size_write(dir
, dir
->i_size
- name_len
* 2);
1190 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
1191 btrfs_update_inode(trans
, root
, dir
);
1192 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1193 dentry
->d_inode
->i_nlink
--;
1195 drop_nlink(dentry
->d_inode
);
1197 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
1198 dir
->i_sb
->s_dirt
= 1;
1203 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
1205 struct btrfs_root
*root
;
1206 struct btrfs_trans_handle
*trans
;
1207 struct inode
*inode
= dentry
->d_inode
;
1209 unsigned long nr
= 0;
1211 root
= BTRFS_I(dir
)->root
;
1213 ret
= btrfs_check_free_space(root
, 1, 1);
1217 trans
= btrfs_start_transaction(root
, 1);
1219 btrfs_set_trans_block_group(trans
, dir
);
1220 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
1222 if (inode
->i_nlink
== 0)
1223 ret
= btrfs_orphan_add(trans
, inode
);
1225 nr
= trans
->blocks_used
;
1227 btrfs_end_transaction_throttle(trans
, root
);
1229 btrfs_btree_balance_dirty(root
, nr
);
1233 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
1235 struct inode
*inode
= dentry
->d_inode
;
1238 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1239 struct btrfs_trans_handle
*trans
;
1240 unsigned long nr
= 0;
1242 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
1246 ret
= btrfs_check_free_space(root
, 1, 1);
1250 trans
= btrfs_start_transaction(root
, 1);
1251 btrfs_set_trans_block_group(trans
, dir
);
1253 err
= btrfs_orphan_add(trans
, inode
);
1257 /* now the directory is empty */
1258 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
1260 btrfs_i_size_write(inode
, 0);
1264 nr
= trans
->blocks_used
;
1265 ret
= btrfs_end_transaction_throttle(trans
, root
);
1267 btrfs_btree_balance_dirty(root
, nr
);
1275 * this can truncate away extent items, csum items and directory items.
1276 * It starts at a high offset and removes keys until it can't find
1277 * any higher than i_size.
1279 * csum items that cross the new i_size are truncated to the new size
1282 * min_type is the minimum key type to truncate down to. If set to 0, this
1283 * will kill all the items on this inode, including the INODE_ITEM_KEY.
1285 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
1286 struct btrfs_root
*root
,
1287 struct inode
*inode
,
1291 struct btrfs_path
*path
;
1292 struct btrfs_key key
;
1293 struct btrfs_key found_key
;
1295 struct extent_buffer
*leaf
;
1296 struct btrfs_file_extent_item
*fi
;
1297 u64 extent_start
= 0;
1298 u64 extent_num_bytes
= 0;
1304 int pending_del_nr
= 0;
1305 int pending_del_slot
= 0;
1306 int extent_type
= -1;
1307 u64 mask
= root
->sectorsize
- 1;
1309 btrfs_drop_extent_cache(inode
, inode
->i_size
& (~mask
), (u64
)-1);
1310 path
= btrfs_alloc_path();
1314 /* FIXME, add redo link to tree so we don't leak on crash */
1315 key
.objectid
= inode
->i_ino
;
1316 key
.offset
= (u64
)-1;
1319 btrfs_init_path(path
);
1321 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
1326 BUG_ON(path
->slots
[0] == 0);
1332 leaf
= path
->nodes
[0];
1333 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1334 found_type
= btrfs_key_type(&found_key
);
1336 if (found_key
.objectid
!= inode
->i_ino
)
1339 if (found_type
< min_type
)
1342 item_end
= found_key
.offset
;
1343 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
1344 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
1345 struct btrfs_file_extent_item
);
1346 extent_type
= btrfs_file_extent_type(leaf
, fi
);
1347 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
1349 btrfs_file_extent_num_bytes(leaf
, fi
);
1350 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
1351 struct btrfs_item
*item
= btrfs_item_nr(leaf
,
1353 item_end
+= btrfs_file_extent_inline_len(leaf
,
1358 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
1359 ret
= btrfs_csum_truncate(trans
, root
, path
,
1363 if (item_end
< inode
->i_size
) {
1364 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
1365 found_type
= BTRFS_INODE_ITEM_KEY
;
1366 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
1367 found_type
= BTRFS_CSUM_ITEM_KEY
;
1368 } else if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
1369 found_type
= BTRFS_XATTR_ITEM_KEY
;
1370 } else if (found_type
== BTRFS_XATTR_ITEM_KEY
) {
1371 found_type
= BTRFS_INODE_REF_KEY
;
1372 } else if (found_type
) {
1377 btrfs_set_key_type(&key
, found_type
);
1380 if (found_key
.offset
>= inode
->i_size
)
1386 /* FIXME, shrink the extent if the ref count is only 1 */
1387 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
1390 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
1392 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
1394 u64 orig_num_bytes
=
1395 btrfs_file_extent_num_bytes(leaf
, fi
);
1396 extent_num_bytes
= inode
->i_size
-
1397 found_key
.offset
+ root
->sectorsize
- 1;
1398 extent_num_bytes
= extent_num_bytes
&
1399 ~((u64
)root
->sectorsize
- 1);
1400 btrfs_set_file_extent_num_bytes(leaf
, fi
,
1402 num_dec
= (orig_num_bytes
-
1404 if (extent_start
!= 0)
1405 dec_i_blocks(inode
, num_dec
);
1406 btrfs_mark_buffer_dirty(leaf
);
1409 btrfs_file_extent_disk_num_bytes(leaf
,
1411 /* FIXME blocksize != 4096 */
1412 num_dec
= btrfs_file_extent_num_bytes(leaf
, fi
);
1413 if (extent_start
!= 0) {
1415 dec_i_blocks(inode
, num_dec
);
1417 root_gen
= btrfs_header_generation(leaf
);
1418 root_owner
= btrfs_header_owner(leaf
);
1420 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
1422 u32 newsize
= inode
->i_size
- found_key
.offset
;
1423 dec_i_blocks(inode
, item_end
+ 1 -
1424 found_key
.offset
- newsize
);
1426 btrfs_file_extent_calc_inline_size(newsize
);
1427 ret
= btrfs_truncate_item(trans
, root
, path
,
1431 dec_i_blocks(inode
, item_end
+ 1 -
1437 if (!pending_del_nr
) {
1438 /* no pending yet, add ourselves */
1439 pending_del_slot
= path
->slots
[0];
1441 } else if (pending_del_nr
&&
1442 path
->slots
[0] + 1 == pending_del_slot
) {
1443 /* hop on the pending chunk */
1445 pending_del_slot
= path
->slots
[0];
1447 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path
->slots
[0], pending_del_nr
, pending_del_slot
);
1453 ret
= btrfs_free_extent(trans
, root
, extent_start
,
1456 root_gen
, inode
->i_ino
,
1457 found_key
.offset
, 0);
1461 if (path
->slots
[0] == 0) {
1464 btrfs_release_path(root
, path
);
1469 if (pending_del_nr
&&
1470 path
->slots
[0] + 1 != pending_del_slot
) {
1471 struct btrfs_key debug
;
1473 btrfs_item_key_to_cpu(path
->nodes
[0], &debug
,
1475 ret
= btrfs_del_items(trans
, root
, path
,
1480 btrfs_release_path(root
, path
);
1486 if (pending_del_nr
) {
1487 ret
= btrfs_del_items(trans
, root
, path
, pending_del_slot
,
1490 btrfs_free_path(path
);
1491 inode
->i_sb
->s_dirt
= 1;
1496 * taken from block_truncate_page, but does cow as it zeros out
1497 * any bytes left in the last page in the file.
1499 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
1501 struct inode
*inode
= mapping
->host
;
1502 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1503 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1504 struct btrfs_ordered_extent
*ordered
;
1506 u32 blocksize
= root
->sectorsize
;
1507 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
1508 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
1514 if ((offset
& (blocksize
- 1)) == 0)
1519 page
= grab_cache_page(mapping
, index
);
1523 page_start
= page_offset(page
);
1524 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
1526 if (!PageUptodate(page
)) {
1527 ret
= btrfs_readpage(NULL
, page
);
1529 if (page
->mapping
!= mapping
) {
1531 page_cache_release(page
);
1534 if (!PageUptodate(page
)) {
1539 wait_on_page_writeback(page
);
1541 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
1542 set_page_extent_mapped(page
);
1544 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
1546 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
1548 page_cache_release(page
);
1549 btrfs_start_ordered_extent(inode
, ordered
, 1);
1550 btrfs_put_ordered_extent(ordered
);
1554 btrfs_set_extent_delalloc(inode
, page_start
, page_end
);
1556 if (offset
!= PAGE_CACHE_SIZE
) {
1558 memset(kaddr
+ offset
, 0, PAGE_CACHE_SIZE
- offset
);
1559 flush_dcache_page(page
);
1562 ClearPageChecked(page
);
1563 set_page_dirty(page
);
1564 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
1568 page_cache_release(page
);
1573 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
1575 struct inode
*inode
= dentry
->d_inode
;
1578 err
= inode_change_ok(inode
, attr
);
1582 if (S_ISREG(inode
->i_mode
) &&
1583 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
1584 struct btrfs_trans_handle
*trans
;
1585 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1586 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1588 u64 mask
= root
->sectorsize
- 1;
1589 u64 hole_start
= (inode
->i_size
+ mask
) & ~mask
;
1590 u64 block_end
= (attr
->ia_size
+ mask
) & ~mask
;
1594 if (attr
->ia_size
<= hole_start
)
1597 err
= btrfs_check_free_space(root
, 1, 0);
1601 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
1603 hole_size
= block_end
- hole_start
;
1605 struct btrfs_ordered_extent
*ordered
;
1606 btrfs_wait_ordered_range(inode
, hole_start
, hole_size
);
1608 lock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
1609 ordered
= btrfs_lookup_ordered_extent(inode
, hole_start
);
1611 unlock_extent(io_tree
, hole_start
,
1612 block_end
- 1, GFP_NOFS
);
1613 btrfs_put_ordered_extent(ordered
);
1619 trans
= btrfs_start_transaction(root
, 1);
1620 btrfs_set_trans_block_group(trans
, inode
);
1621 mutex_lock(&BTRFS_I(inode
)->extent_mutex
);
1622 err
= btrfs_drop_extents(trans
, root
, inode
,
1623 hole_start
, block_end
, hole_start
,
1626 if (alloc_hint
!= EXTENT_MAP_INLINE
) {
1627 err
= btrfs_insert_file_extent(trans
, root
,
1631 btrfs_drop_extent_cache(inode
, hole_start
,
1633 btrfs_check_file(root
, inode
);
1635 mutex_unlock(&BTRFS_I(inode
)->extent_mutex
);
1636 btrfs_end_transaction(trans
, root
);
1637 unlock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
1642 err
= inode_setattr(inode
, attr
);
1644 if (!err
&& ((attr
->ia_valid
& ATTR_MODE
)))
1645 err
= btrfs_acl_chmod(inode
);
1650 void btrfs_delete_inode(struct inode
*inode
)
1652 struct btrfs_trans_handle
*trans
;
1653 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1657 truncate_inode_pages(&inode
->i_data
, 0);
1658 if (is_bad_inode(inode
)) {
1659 btrfs_orphan_del(NULL
, inode
);
1662 btrfs_wait_ordered_range(inode
, 0, (u64
)-1);
1664 btrfs_i_size_write(inode
, 0);
1665 trans
= btrfs_start_transaction(root
, 1);
1667 btrfs_set_trans_block_group(trans
, inode
);
1668 ret
= btrfs_truncate_in_trans(trans
, root
, inode
, 0);
1670 btrfs_orphan_del(NULL
, inode
);
1671 goto no_delete_lock
;
1674 btrfs_orphan_del(trans
, inode
);
1676 nr
= trans
->blocks_used
;
1679 btrfs_end_transaction(trans
, root
);
1680 btrfs_btree_balance_dirty(root
, nr
);
1684 nr
= trans
->blocks_used
;
1685 btrfs_end_transaction(trans
, root
);
1686 btrfs_btree_balance_dirty(root
, nr
);
1692 * this returns the key found in the dir entry in the location pointer.
1693 * If no dir entries were found, location->objectid is 0.
1695 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
1696 struct btrfs_key
*location
)
1698 const char *name
= dentry
->d_name
.name
;
1699 int namelen
= dentry
->d_name
.len
;
1700 struct btrfs_dir_item
*di
;
1701 struct btrfs_path
*path
;
1702 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1705 path
= btrfs_alloc_path();
1708 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
1712 if (!di
|| IS_ERR(di
)) {
1715 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
1717 btrfs_free_path(path
);
1720 location
->objectid
= 0;
1725 * when we hit a tree root in a directory, the btrfs part of the inode
1726 * needs to be changed to reflect the root directory of the tree root. This
1727 * is kind of like crossing a mount point.
1729 static int fixup_tree_root_location(struct btrfs_root
*root
,
1730 struct btrfs_key
*location
,
1731 struct btrfs_root
**sub_root
,
1732 struct dentry
*dentry
)
1734 struct btrfs_root_item
*ri
;
1736 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
1738 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
1741 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
1742 dentry
->d_name
.name
,
1743 dentry
->d_name
.len
);
1744 if (IS_ERR(*sub_root
))
1745 return PTR_ERR(*sub_root
);
1747 ri
= &(*sub_root
)->root_item
;
1748 location
->objectid
= btrfs_root_dirid(ri
);
1749 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1750 location
->offset
= 0;
1755 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
1757 struct btrfs_iget_args
*args
= p
;
1758 inode
->i_ino
= args
->ino
;
1759 BTRFS_I(inode
)->root
= args
->root
;
1760 BTRFS_I(inode
)->delalloc_bytes
= 0;
1761 inode
->i_mapping
->writeback_index
= 0;
1762 BTRFS_I(inode
)->disk_i_size
= 0;
1763 BTRFS_I(inode
)->index_cnt
= (u64
)-1;
1764 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1765 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1766 inode
->i_mapping
, GFP_NOFS
);
1767 extent_io_tree_init(&BTRFS_I(inode
)->io_failure_tree
,
1768 inode
->i_mapping
, GFP_NOFS
);
1769 INIT_LIST_HEAD(&BTRFS_I(inode
)->delalloc_inodes
);
1770 btrfs_ordered_inode_tree_init(&BTRFS_I(inode
)->ordered_tree
);
1771 mutex_init(&BTRFS_I(inode
)->csum_mutex
);
1772 mutex_init(&BTRFS_I(inode
)->extent_mutex
);
1776 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
1778 struct btrfs_iget_args
*args
= opaque
;
1779 return (args
->ino
== inode
->i_ino
&&
1780 args
->root
== BTRFS_I(inode
)->root
);
1783 struct inode
*btrfs_ilookup(struct super_block
*s
, u64 objectid
,
1786 struct btrfs_iget_args args
;
1787 args
.ino
= objectid
;
1788 args
.root
= btrfs_lookup_fs_root(btrfs_sb(s
)->fs_info
, root_objectid
);
1793 return ilookup5(s
, objectid
, btrfs_find_actor
, (void *)&args
);
1796 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1797 struct btrfs_root
*root
)
1799 struct inode
*inode
;
1800 struct btrfs_iget_args args
;
1801 args
.ino
= objectid
;
1804 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
1805 btrfs_init_locked_inode
,
1810 /* Get an inode object given its location and corresponding root.
1811 * Returns in *is_new if the inode was read from disk
1813 struct inode
*btrfs_iget(struct super_block
*s
, struct btrfs_key
*location
,
1814 struct btrfs_root
*root
, int *is_new
)
1816 struct inode
*inode
;
1818 inode
= btrfs_iget_locked(s
, location
->objectid
, root
);
1820 return ERR_PTR(-EACCES
);
1822 if (inode
->i_state
& I_NEW
) {
1823 BTRFS_I(inode
)->root
= root
;
1824 memcpy(&BTRFS_I(inode
)->location
, location
, sizeof(*location
));
1825 btrfs_read_locked_inode(inode
);
1826 unlock_new_inode(inode
);
1837 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
1838 struct nameidata
*nd
)
1840 struct inode
* inode
;
1841 struct btrfs_inode
*bi
= BTRFS_I(dir
);
1842 struct btrfs_root
*root
= bi
->root
;
1843 struct btrfs_root
*sub_root
= root
;
1844 struct btrfs_key location
;
1845 int ret
, new, do_orphan
= 0;
1847 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
1848 return ERR_PTR(-ENAMETOOLONG
);
1850 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
1853 return ERR_PTR(ret
);
1856 if (location
.objectid
) {
1857 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
1860 return ERR_PTR(ret
);
1862 return ERR_PTR(-ENOENT
);
1863 inode
= btrfs_iget(dir
->i_sb
, &location
, sub_root
, &new);
1865 return ERR_CAST(inode
);
1867 /* the inode and parent dir are two different roots */
1868 if (new && root
!= sub_root
) {
1870 sub_root
->inode
= inode
;
1875 if (unlikely(do_orphan
))
1876 btrfs_orphan_cleanup(sub_root
);
1878 return d_splice_alias(inode
, dentry
);
1881 static unsigned char btrfs_filetype_table
[] = {
1882 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
1885 static int btrfs_real_readdir(struct file
*filp
, void *dirent
,
1888 struct inode
*inode
= filp
->f_dentry
->d_inode
;
1889 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1890 struct btrfs_item
*item
;
1891 struct btrfs_dir_item
*di
;
1892 struct btrfs_key key
;
1893 struct btrfs_key found_key
;
1894 struct btrfs_path
*path
;
1897 struct extent_buffer
*leaf
;
1900 unsigned char d_type
;
1905 int key_type
= BTRFS_DIR_INDEX_KEY
;
1910 /* FIXME, use a real flag for deciding about the key type */
1911 if (root
->fs_info
->tree_root
== root
)
1912 key_type
= BTRFS_DIR_ITEM_KEY
;
1914 /* special case for "." */
1915 if (filp
->f_pos
== 0) {
1916 over
= filldir(dirent
, ".", 1,
1923 /* special case for .., just use the back ref */
1924 if (filp
->f_pos
== 1) {
1925 u64 pino
= parent_ino(filp
->f_path
.dentry
);
1926 over
= filldir(dirent
, "..", 2,
1933 path
= btrfs_alloc_path();
1936 btrfs_set_key_type(&key
, key_type
);
1937 key
.offset
= filp
->f_pos
;
1938 key
.objectid
= inode
->i_ino
;
1940 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1946 leaf
= path
->nodes
[0];
1947 nritems
= btrfs_header_nritems(leaf
);
1948 slot
= path
->slots
[0];
1949 if (advance
|| slot
>= nritems
) {
1950 if (slot
>= nritems
- 1) {
1951 ret
= btrfs_next_leaf(root
, path
);
1954 leaf
= path
->nodes
[0];
1955 nritems
= btrfs_header_nritems(leaf
);
1956 slot
= path
->slots
[0];
1963 item
= btrfs_item_nr(leaf
, slot
);
1964 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1966 if (found_key
.objectid
!= key
.objectid
)
1968 if (btrfs_key_type(&found_key
) != key_type
)
1970 if (found_key
.offset
< filp
->f_pos
)
1973 filp
->f_pos
= found_key
.offset
;
1975 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1977 di_total
= btrfs_item_size(leaf
, item
);
1979 while (di_cur
< di_total
) {
1980 struct btrfs_key location
;
1982 name_len
= btrfs_dir_name_len(leaf
, di
);
1983 if (name_len
<= sizeof(tmp_name
)) {
1984 name_ptr
= tmp_name
;
1986 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
1992 read_extent_buffer(leaf
, name_ptr
,
1993 (unsigned long)(di
+ 1), name_len
);
1995 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
1996 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
1997 over
= filldir(dirent
, name_ptr
, name_len
,
1998 found_key
.offset
, location
.objectid
,
2001 if (name_ptr
!= tmp_name
)
2007 di_len
= btrfs_dir_name_len(leaf
, di
) +
2008 btrfs_dir_data_len(leaf
, di
) + sizeof(*di
);
2010 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
2014 /* Reached end of directory/root. Bump pos past the last item. */
2015 if (key_type
== BTRFS_DIR_INDEX_KEY
)
2016 filp
->f_pos
= INT_LIMIT(typeof(filp
->f_pos
));
2022 btrfs_free_path(path
);
2026 /* Kernels earlier than 2.6.28 still have the NFS deadlock where nfsd
2027 will call the file system's ->lookup() method from within its
2028 filldir callback, which in turn was called from the file system's
2029 ->readdir() method. And will deadlock for many file systems. */
2030 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
2032 struct nfshack_dirent
{
2036 unsigned int d_type
;
2040 struct nfshack_readdir
{
2048 static int btrfs_nfshack_filldir(void *__buf
, const char *name
, int namlen
,
2049 loff_t offset
, u64 ino
, unsigned int d_type
)
2051 struct nfshack_readdir
*buf
= __buf
;
2052 struct nfshack_dirent
*de
= (void *)(buf
->dirent
+ buf
->used
);
2053 unsigned int reclen
;
2055 reclen
= ALIGN(sizeof(struct nfshack_dirent
) + namlen
, sizeof(u64
));
2056 if (buf
->used
+ reclen
> PAGE_SIZE
) {
2061 de
->namlen
= namlen
;
2062 de
->offset
= offset
;
2064 de
->d_type
= d_type
;
2065 memcpy(de
->name
, name
, namlen
);
2066 buf
->used
+= reclen
;
2071 static int btrfs_nfshack_readdir(struct file
*file
, void *dirent
,
2074 struct nfshack_readdir buf
;
2075 struct nfshack_dirent
*de
;
2080 buf
.dirent
= (void *)__get_free_page(GFP_KERNEL
);
2084 offset
= file
->f_pos
;
2087 unsigned int reclen
;
2091 err
= btrfs_real_readdir(file
, &buf
, btrfs_nfshack_filldir
);
2100 de
= (struct nfshack_dirent
*)buf
.dirent
;
2102 offset
= de
->offset
;
2104 if (filldir(dirent
, de
->name
, de
->namlen
, de
->offset
,
2105 de
->ino
, de
->d_type
))
2107 offset
= file
->f_pos
;
2109 reclen
= ALIGN(sizeof(*de
) + de
->namlen
,
2112 de
= (struct nfshack_dirent
*)((char *)de
+ reclen
);
2117 free_page((unsigned long)buf
.dirent
);
2118 file
->f_pos
= offset
;
2124 int btrfs_write_inode(struct inode
*inode
, int wait
)
2126 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2127 struct btrfs_trans_handle
*trans
;
2130 if (root
->fs_info
->closing
> 1)
2134 trans
= btrfs_join_transaction(root
, 1);
2135 btrfs_set_trans_block_group(trans
, inode
);
2136 ret
= btrfs_commit_transaction(trans
, root
);
2142 * This is somewhat expensive, updating the tree every time the
2143 * inode changes. But, it is most likely to find the inode in cache.
2144 * FIXME, needs more benchmarking...there are no reasons other than performance
2145 * to keep or drop this code.
2147 void btrfs_dirty_inode(struct inode
*inode
)
2149 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2150 struct btrfs_trans_handle
*trans
;
2152 trans
= btrfs_join_transaction(root
, 1);
2153 btrfs_set_trans_block_group(trans
, inode
);
2154 btrfs_update_inode(trans
, root
, inode
);
2155 btrfs_end_transaction(trans
, root
);
2158 static int btrfs_set_inode_index_count(struct inode
*inode
)
2160 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2161 struct btrfs_key key
, found_key
;
2162 struct btrfs_path
*path
;
2163 struct extent_buffer
*leaf
;
2166 key
.objectid
= inode
->i_ino
;
2167 btrfs_set_key_type(&key
, BTRFS_DIR_INDEX_KEY
);
2168 key
.offset
= (u64
)-1;
2170 path
= btrfs_alloc_path();
2174 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2177 /* FIXME: we should be able to handle this */
2183 * MAGIC NUMBER EXPLANATION:
2184 * since we search a directory based on f_pos we have to start at 2
2185 * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody
2186 * else has to start at 2
2188 if (path
->slots
[0] == 0) {
2189 BTRFS_I(inode
)->index_cnt
= 2;
2195 leaf
= path
->nodes
[0];
2196 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
2198 if (found_key
.objectid
!= inode
->i_ino
||
2199 btrfs_key_type(&found_key
) != BTRFS_DIR_INDEX_KEY
) {
2200 BTRFS_I(inode
)->index_cnt
= 2;
2204 BTRFS_I(inode
)->index_cnt
= found_key
.offset
+ 1;
2206 btrfs_free_path(path
);
2210 static int btrfs_set_inode_index(struct inode
*dir
, struct inode
*inode
,
2215 if (BTRFS_I(dir
)->index_cnt
== (u64
)-1) {
2216 ret
= btrfs_set_inode_index_count(dir
);
2221 *index
= BTRFS_I(dir
)->index_cnt
;
2222 BTRFS_I(dir
)->index_cnt
++;
2227 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
2228 struct btrfs_root
*root
,
2230 const char *name
, int name_len
,
2233 struct btrfs_block_group_cache
*group
,
2234 int mode
, u64
*index
)
2236 struct inode
*inode
;
2237 struct btrfs_inode_item
*inode_item
;
2238 struct btrfs_block_group_cache
*new_inode_group
;
2239 struct btrfs_key
*location
;
2240 struct btrfs_path
*path
;
2241 struct btrfs_inode_ref
*ref
;
2242 struct btrfs_key key
[2];
2248 path
= btrfs_alloc_path();
2251 inode
= new_inode(root
->fs_info
->sb
);
2253 return ERR_PTR(-ENOMEM
);
2256 ret
= btrfs_set_inode_index(dir
, inode
, index
);
2258 return ERR_PTR(ret
);
2261 * index_cnt is ignored for everything but a dir,
2262 * btrfs_get_inode_index_count has an explanation for the magic
2265 BTRFS_I(inode
)->index_cnt
= 2;
2267 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
2268 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
2269 inode
->i_mapping
, GFP_NOFS
);
2270 extent_io_tree_init(&BTRFS_I(inode
)->io_failure_tree
,
2271 inode
->i_mapping
, GFP_NOFS
);
2272 btrfs_ordered_inode_tree_init(&BTRFS_I(inode
)->ordered_tree
);
2273 INIT_LIST_HEAD(&BTRFS_I(inode
)->delalloc_inodes
);
2274 mutex_init(&BTRFS_I(inode
)->csum_mutex
);
2275 mutex_init(&BTRFS_I(inode
)->extent_mutex
);
2276 BTRFS_I(inode
)->delalloc_bytes
= 0;
2277 inode
->i_mapping
->writeback_index
= 0;
2278 BTRFS_I(inode
)->disk_i_size
= 0;
2279 BTRFS_I(inode
)->root
= root
;
2285 new_inode_group
= btrfs_find_block_group(root
, group
, 0,
2286 BTRFS_BLOCK_GROUP_METADATA
, owner
);
2287 if (!new_inode_group
) {
2288 printk("find_block group failed\n");
2289 new_inode_group
= group
;
2291 BTRFS_I(inode
)->block_group
= new_inode_group
;
2292 BTRFS_I(inode
)->flags
= 0;
2294 key
[0].objectid
= objectid
;
2295 btrfs_set_key_type(&key
[0], BTRFS_INODE_ITEM_KEY
);
2298 key
[1].objectid
= objectid
;
2299 btrfs_set_key_type(&key
[1], BTRFS_INODE_REF_KEY
);
2300 key
[1].offset
= ref_objectid
;
2302 sizes
[0] = sizeof(struct btrfs_inode_item
);
2303 sizes
[1] = name_len
+ sizeof(*ref
);
2305 ret
= btrfs_insert_empty_items(trans
, root
, path
, key
, sizes
, 2);
2309 if (objectid
> root
->highest_inode
)
2310 root
->highest_inode
= objectid
;
2312 inode
->i_uid
= current
->fsuid
;
2313 inode
->i_gid
= current
->fsgid
;
2314 inode
->i_mode
= mode
;
2315 inode
->i_ino
= objectid
;
2316 inode
->i_blocks
= 0;
2317 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
2318 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
2319 struct btrfs_inode_item
);
2320 fill_inode_item(path
->nodes
[0], inode_item
, inode
);
2322 ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0] + 1,
2323 struct btrfs_inode_ref
);
2324 btrfs_set_inode_ref_name_len(path
->nodes
[0], ref
, name_len
);
2325 btrfs_set_inode_ref_index(path
->nodes
[0], ref
, *index
);
2326 ptr
= (unsigned long)(ref
+ 1);
2327 write_extent_buffer(path
->nodes
[0], name
, ptr
, name_len
);
2329 btrfs_mark_buffer_dirty(path
->nodes
[0]);
2330 btrfs_free_path(path
);
2332 location
= &BTRFS_I(inode
)->location
;
2333 location
->objectid
= objectid
;
2334 location
->offset
= 0;
2335 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
2337 insert_inode_hash(inode
);
2341 BTRFS_I(dir
)->index_cnt
--;
2342 btrfs_free_path(path
);
2343 return ERR_PTR(ret
);
2346 static inline u8
btrfs_inode_type(struct inode
*inode
)
2348 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
2351 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
2352 struct dentry
*dentry
, struct inode
*inode
,
2353 int add_backref
, u64 index
)
2356 struct btrfs_key key
;
2357 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
2358 struct inode
*parent_inode
= dentry
->d_parent
->d_inode
;
2360 key
.objectid
= inode
->i_ino
;
2361 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
2364 ret
= btrfs_insert_dir_item(trans
, root
,
2365 dentry
->d_name
.name
, dentry
->d_name
.len
,
2366 dentry
->d_parent
->d_inode
->i_ino
,
2367 &key
, btrfs_inode_type(inode
),
2371 ret
= btrfs_insert_inode_ref(trans
, root
,
2372 dentry
->d_name
.name
,
2375 parent_inode
->i_ino
,
2378 btrfs_i_size_write(parent_inode
, parent_inode
->i_size
+
2379 dentry
->d_name
.len
* 2);
2380 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
2381 ret
= btrfs_update_inode(trans
, root
,
2382 dentry
->d_parent
->d_inode
);
2387 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
2388 struct dentry
*dentry
, struct inode
*inode
,
2389 int backref
, u64 index
)
2391 int err
= btrfs_add_link(trans
, dentry
, inode
, backref
, index
);
2393 d_instantiate(dentry
, inode
);
2401 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
2402 int mode
, dev_t rdev
)
2404 struct btrfs_trans_handle
*trans
;
2405 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2406 struct inode
*inode
= NULL
;
2410 unsigned long nr
= 0;
2413 if (!new_valid_dev(rdev
))
2416 err
= btrfs_check_free_space(root
, 1, 0);
2420 trans
= btrfs_start_transaction(root
, 1);
2421 btrfs_set_trans_block_group(trans
, dir
);
2423 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2429 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
2431 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
2432 BTRFS_I(dir
)->block_group
, mode
, &index
);
2433 err
= PTR_ERR(inode
);
2437 err
= btrfs_init_acl(inode
, dir
);
2443 btrfs_set_trans_block_group(trans
, inode
);
2444 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0, index
);
2448 inode
->i_op
= &btrfs_special_inode_operations
;
2449 init_special_inode(inode
, inode
->i_mode
, rdev
);
2450 btrfs_update_inode(trans
, root
, inode
);
2452 dir
->i_sb
->s_dirt
= 1;
2453 btrfs_update_inode_block_group(trans
, inode
);
2454 btrfs_update_inode_block_group(trans
, dir
);
2456 nr
= trans
->blocks_used
;
2457 btrfs_end_transaction_throttle(trans
, root
);
2460 inode_dec_link_count(inode
);
2463 btrfs_btree_balance_dirty(root
, nr
);
2467 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
2468 int mode
, struct nameidata
*nd
)
2470 struct btrfs_trans_handle
*trans
;
2471 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2472 struct inode
*inode
= NULL
;
2475 unsigned long nr
= 0;
2479 err
= btrfs_check_free_space(root
, 1, 0);
2482 trans
= btrfs_start_transaction(root
, 1);
2483 btrfs_set_trans_block_group(trans
, dir
);
2485 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2491 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
2493 dentry
->d_parent
->d_inode
->i_ino
,
2494 objectid
, BTRFS_I(dir
)->block_group
, mode
,
2496 err
= PTR_ERR(inode
);
2500 err
= btrfs_init_acl(inode
, dir
);
2506 btrfs_set_trans_block_group(trans
, inode
);
2507 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0, index
);
2511 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2512 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
2513 inode
->i_fop
= &btrfs_file_operations
;
2514 inode
->i_op
= &btrfs_file_inode_operations
;
2515 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
2516 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
2517 inode
->i_mapping
, GFP_NOFS
);
2518 extent_io_tree_init(&BTRFS_I(inode
)->io_failure_tree
,
2519 inode
->i_mapping
, GFP_NOFS
);
2520 INIT_LIST_HEAD(&BTRFS_I(inode
)->delalloc_inodes
);
2521 mutex_init(&BTRFS_I(inode
)->csum_mutex
);
2522 mutex_init(&BTRFS_I(inode
)->extent_mutex
);
2523 BTRFS_I(inode
)->delalloc_bytes
= 0;
2524 BTRFS_I(inode
)->disk_i_size
= 0;
2525 inode
->i_mapping
->writeback_index
= 0;
2526 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
2527 btrfs_ordered_inode_tree_init(&BTRFS_I(inode
)->ordered_tree
);
2529 dir
->i_sb
->s_dirt
= 1;
2530 btrfs_update_inode_block_group(trans
, inode
);
2531 btrfs_update_inode_block_group(trans
, dir
);
2533 nr
= trans
->blocks_used
;
2534 btrfs_end_transaction_throttle(trans
, root
);
2537 inode_dec_link_count(inode
);
2540 btrfs_btree_balance_dirty(root
, nr
);
2544 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
2545 struct dentry
*dentry
)
2547 struct btrfs_trans_handle
*trans
;
2548 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2549 struct inode
*inode
= old_dentry
->d_inode
;
2551 unsigned long nr
= 0;
2555 if (inode
->i_nlink
== 0)
2558 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
2563 err
= btrfs_check_free_space(root
, 1, 0);
2566 err
= btrfs_set_inode_index(dir
, inode
, &index
);
2570 trans
= btrfs_start_transaction(root
, 1);
2572 btrfs_set_trans_block_group(trans
, dir
);
2573 atomic_inc(&inode
->i_count
);
2575 err
= btrfs_add_nondir(trans
, dentry
, inode
, 1, index
);
2580 dir
->i_sb
->s_dirt
= 1;
2581 btrfs_update_inode_block_group(trans
, dir
);
2582 err
= btrfs_update_inode(trans
, root
, inode
);
2587 nr
= trans
->blocks_used
;
2588 btrfs_end_transaction_throttle(trans
, root
);
2591 inode_dec_link_count(inode
);
2594 btrfs_btree_balance_dirty(root
, nr
);
2598 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
2600 struct inode
*inode
= NULL
;
2601 struct btrfs_trans_handle
*trans
;
2602 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2604 int drop_on_err
= 0;
2607 unsigned long nr
= 1;
2609 err
= btrfs_check_free_space(root
, 1, 0);
2613 trans
= btrfs_start_transaction(root
, 1);
2614 btrfs_set_trans_block_group(trans
, dir
);
2616 if (IS_ERR(trans
)) {
2617 err
= PTR_ERR(trans
);
2621 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2627 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
2629 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
2630 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
,
2632 if (IS_ERR(inode
)) {
2633 err
= PTR_ERR(inode
);
2639 err
= btrfs_init_acl(inode
, dir
);
2643 inode
->i_op
= &btrfs_dir_inode_operations
;
2644 inode
->i_fop
= &btrfs_dir_file_operations
;
2645 btrfs_set_trans_block_group(trans
, inode
);
2647 btrfs_i_size_write(inode
, 0);
2648 err
= btrfs_update_inode(trans
, root
, inode
);
2652 err
= btrfs_add_link(trans
, dentry
, inode
, 0, index
);
2656 d_instantiate(dentry
, inode
);
2658 dir
->i_sb
->s_dirt
= 1;
2659 btrfs_update_inode_block_group(trans
, inode
);
2660 btrfs_update_inode_block_group(trans
, dir
);
2663 nr
= trans
->blocks_used
;
2664 btrfs_end_transaction_throttle(trans
, root
);
2669 btrfs_btree_balance_dirty(root
, nr
);
2673 static int merge_extent_mapping(struct extent_map_tree
*em_tree
,
2674 struct extent_map
*existing
,
2675 struct extent_map
*em
,
2676 u64 map_start
, u64 map_len
)
2680 BUG_ON(map_start
< em
->start
|| map_start
>= extent_map_end(em
));
2681 start_diff
= map_start
- em
->start
;
2682 em
->start
= map_start
;
2684 if (em
->block_start
< EXTENT_MAP_LAST_BYTE
)
2685 em
->block_start
+= start_diff
;
2686 return add_extent_mapping(em_tree
, em
);
2689 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
2690 size_t pg_offset
, u64 start
, u64 len
,
2696 u64 extent_start
= 0;
2698 u64 objectid
= inode
->i_ino
;
2700 struct btrfs_path
*path
= NULL
;
2701 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2702 struct btrfs_file_extent_item
*item
;
2703 struct extent_buffer
*leaf
;
2704 struct btrfs_key found_key
;
2705 struct extent_map
*em
= NULL
;
2706 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
2707 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2708 struct btrfs_trans_handle
*trans
= NULL
;
2711 spin_lock(&em_tree
->lock
);
2712 em
= lookup_extent_mapping(em_tree
, start
, len
);
2714 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
2715 spin_unlock(&em_tree
->lock
);
2718 if (em
->start
> start
|| em
->start
+ em
->len
<= start
)
2719 free_extent_map(em
);
2720 else if (em
->block_start
== EXTENT_MAP_INLINE
&& page
)
2721 free_extent_map(em
);
2725 em
= alloc_extent_map(GFP_NOFS
);
2730 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
2731 em
->start
= EXTENT_MAP_HOLE
;
2735 path
= btrfs_alloc_path();
2739 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
2740 objectid
, start
, trans
!= NULL
);
2747 if (path
->slots
[0] == 0)
2752 leaf
= path
->nodes
[0];
2753 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2754 struct btrfs_file_extent_item
);
2755 /* are we inside the extent that was found? */
2756 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
2757 found_type
= btrfs_key_type(&found_key
);
2758 if (found_key
.objectid
!= objectid
||
2759 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
2763 found_type
= btrfs_file_extent_type(leaf
, item
);
2764 extent_start
= found_key
.offset
;
2765 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
2766 extent_end
= extent_start
+
2767 btrfs_file_extent_num_bytes(leaf
, item
);
2769 if (start
< extent_start
|| start
>= extent_end
) {
2771 if (start
< extent_start
) {
2772 if (start
+ len
<= extent_start
)
2774 em
->len
= extent_end
- extent_start
;
2780 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
2782 em
->start
= extent_start
;
2783 em
->len
= extent_end
- extent_start
;
2784 em
->block_start
= EXTENT_MAP_HOLE
;
2787 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
2788 em
->block_start
= bytenr
;
2789 em
->start
= extent_start
;
2790 em
->len
= extent_end
- extent_start
;
2792 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
2797 size_t extent_offset
;
2800 size
= btrfs_file_extent_inline_len(leaf
, btrfs_item_nr(leaf
,
2802 extent_end
= (extent_start
+ size
+ root
->sectorsize
- 1) &
2803 ~((u64
)root
->sectorsize
- 1);
2804 if (start
< extent_start
|| start
>= extent_end
) {
2806 if (start
< extent_start
) {
2807 if (start
+ len
<= extent_start
)
2809 em
->len
= extent_end
- extent_start
;
2815 em
->block_start
= EXTENT_MAP_INLINE
;
2818 em
->start
= extent_start
;
2823 page_start
= page_offset(page
) + pg_offset
;
2824 extent_offset
= page_start
- extent_start
;
2825 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- pg_offset
,
2826 size
- extent_offset
);
2827 em
->start
= extent_start
+ extent_offset
;
2828 em
->len
= (copy_size
+ root
->sectorsize
- 1) &
2829 ~((u64
)root
->sectorsize
- 1);
2831 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
2832 if (create
== 0 && !PageUptodate(page
)) {
2833 read_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
2835 flush_dcache_page(page
);
2836 } else if (create
&& PageUptodate(page
)) {
2839 free_extent_map(em
);
2841 btrfs_release_path(root
, path
);
2842 trans
= btrfs_join_transaction(root
, 1);
2845 write_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
2847 btrfs_mark_buffer_dirty(leaf
);
2850 set_extent_uptodate(io_tree
, em
->start
,
2851 extent_map_end(em
) - 1, GFP_NOFS
);
2854 printk("unkknown found_type %d\n", found_type
);
2861 em
->block_start
= EXTENT_MAP_HOLE
;
2863 btrfs_release_path(root
, path
);
2864 if (em
->start
> start
|| extent_map_end(em
) <= start
) {
2865 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->len
, start
, len
);
2871 spin_lock(&em_tree
->lock
);
2872 ret
= add_extent_mapping(em_tree
, em
);
2873 /* it is possible that someone inserted the extent into the tree
2874 * while we had the lock dropped. It is also possible that
2875 * an overlapping map exists in the tree
2877 if (ret
== -EEXIST
) {
2878 struct extent_map
*existing
;
2882 existing
= lookup_extent_mapping(em_tree
, start
, len
);
2883 if (existing
&& (existing
->start
> start
||
2884 existing
->start
+ existing
->len
<= start
)) {
2885 free_extent_map(existing
);
2889 existing
= lookup_extent_mapping(em_tree
, em
->start
,
2892 err
= merge_extent_mapping(em_tree
, existing
,
2895 free_extent_map(existing
);
2897 free_extent_map(em
);
2902 printk("failing to insert %Lu %Lu\n",
2904 free_extent_map(em
);
2908 free_extent_map(em
);
2913 spin_unlock(&em_tree
->lock
);
2916 btrfs_free_path(path
);
2918 ret
= btrfs_end_transaction(trans
, root
);
2924 free_extent_map(em
);
2926 return ERR_PTR(err
);
2931 #if 0 /* waiting for O_DIRECT reads */
2932 static int btrfs_get_block(struct inode
*inode
, sector_t iblock
,
2933 struct buffer_head
*bh_result
, int create
)
2935 struct extent_map
*em
;
2936 u64 start
= (u64
)iblock
<< inode
->i_blkbits
;
2937 struct btrfs_multi_bio
*multi
= NULL
;
2938 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2944 em
= btrfs_get_extent(inode
, NULL
, 0, start
, bh_result
->b_size
, 0);
2946 if (!em
|| IS_ERR(em
))
2949 if (em
->start
> start
|| em
->start
+ em
->len
<= start
) {
2953 if (em
->block_start
== EXTENT_MAP_INLINE
) {
2958 len
= em
->start
+ em
->len
- start
;
2959 len
= min_t(u64
, len
, INT_LIMIT(typeof(bh_result
->b_size
)));
2961 if (em
->block_start
== EXTENT_MAP_HOLE
||
2962 em
->block_start
== EXTENT_MAP_DELALLOC
) {
2963 bh_result
->b_size
= len
;
2967 logical
= start
- em
->start
;
2968 logical
= em
->block_start
+ logical
;
2971 ret
= btrfs_map_block(&root
->fs_info
->mapping_tree
, READ
,
2972 logical
, &map_length
, &multi
, 0);
2974 bh_result
->b_blocknr
= multi
->stripes
[0].physical
>> inode
->i_blkbits
;
2975 bh_result
->b_size
= min(map_length
, len
);
2977 bh_result
->b_bdev
= multi
->stripes
[0].dev
->bdev
;
2978 set_buffer_mapped(bh_result
);
2981 free_extent_map(em
);
2986 static ssize_t
btrfs_direct_IO(int rw
, struct kiocb
*iocb
,
2987 const struct iovec
*iov
, loff_t offset
,
2988 unsigned long nr_segs
)
2992 struct file
*file
= iocb
->ki_filp
;
2993 struct inode
*inode
= file
->f_mapping
->host
;
2998 return blockdev_direct_IO(rw
, iocb
, inode
, inode
->i_sb
->s_bdev
, iov
,
2999 offset
, nr_segs
, btrfs_get_block
, NULL
);
3003 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
3005 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
3008 int btrfs_readpage(struct file
*file
, struct page
*page
)
3010 struct extent_io_tree
*tree
;
3011 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
3012 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
3015 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
3017 struct extent_io_tree
*tree
;
3020 if (current
->flags
& PF_MEMALLOC
) {
3021 redirty_page_for_writepage(wbc
, page
);
3025 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
3026 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
3029 int btrfs_writepages(struct address_space
*mapping
,
3030 struct writeback_control
*wbc
)
3032 struct extent_io_tree
*tree
;
3033 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
3034 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
3038 btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
3039 struct list_head
*pages
, unsigned nr_pages
)
3041 struct extent_io_tree
*tree
;
3042 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
3043 return extent_readpages(tree
, mapping
, pages
, nr_pages
,
3046 static int __btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
3048 struct extent_io_tree
*tree
;
3049 struct extent_map_tree
*map
;
3052 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
3053 map
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
3054 ret
= try_release_extent_mapping(map
, tree
, page
, gfp_flags
);
3056 ClearPagePrivate(page
);
3057 set_page_private(page
, 0);
3058 page_cache_release(page
);
3063 static int btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
3065 return __btrfs_releasepage(page
, gfp_flags
);
3068 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
3070 struct extent_io_tree
*tree
;
3071 struct btrfs_ordered_extent
*ordered
;
3072 u64 page_start
= page_offset(page
);
3073 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
3075 wait_on_page_writeback(page
);
3076 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
3078 btrfs_releasepage(page
, GFP_NOFS
);
3082 lock_extent(tree
, page_start
, page_end
, GFP_NOFS
);
3083 ordered
= btrfs_lookup_ordered_extent(page
->mapping
->host
,
3087 * IO on this page will never be started, so we need
3088 * to account for any ordered extents now
3090 clear_extent_bit(tree
, page_start
, page_end
,
3091 EXTENT_DIRTY
| EXTENT_DELALLOC
|
3092 EXTENT_LOCKED
, 1, 0, GFP_NOFS
);
3093 btrfs_finish_ordered_io(page
->mapping
->host
,
3094 page_start
, page_end
);
3095 btrfs_put_ordered_extent(ordered
);
3096 lock_extent(tree
, page_start
, page_end
, GFP_NOFS
);
3098 clear_extent_bit(tree
, page_start
, page_end
,
3099 EXTENT_LOCKED
| EXTENT_DIRTY
| EXTENT_DELALLOC
|
3102 __btrfs_releasepage(page
, GFP_NOFS
);
3104 ClearPageChecked(page
);
3105 if (PagePrivate(page
)) {
3106 ClearPagePrivate(page
);
3107 set_page_private(page
, 0);
3108 page_cache_release(page
);
3113 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
3114 * called from a page fault handler when a page is first dirtied. Hence we must
3115 * be careful to check for EOF conditions here. We set the page up correctly
3116 * for a written page which means we get ENOSPC checking when writing into
3117 * holes and correct delalloc and unwritten extent mapping on filesystems that
3118 * support these features.
3120 * We are not allowed to take the i_mutex here so we have to play games to
3121 * protect against truncate races as the page could now be beyond EOF. Because
3122 * vmtruncate() writes the inode size before removing pages, once we have the
3123 * page lock we can determine safely if the page is beyond EOF. If it is not
3124 * beyond EOF, then the page is guaranteed safe against truncation until we
3127 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
3129 struct inode
*inode
= fdentry(vma
->vm_file
)->d_inode
;
3130 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3131 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
3132 struct btrfs_ordered_extent
*ordered
;
3134 unsigned long zero_start
;
3140 ret
= btrfs_check_free_space(root
, PAGE_CACHE_SIZE
, 0);
3147 size
= i_size_read(inode
);
3148 page_start
= page_offset(page
);
3149 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
3151 if ((page
->mapping
!= inode
->i_mapping
) ||
3152 (page_start
>= size
)) {
3153 /* page got truncated out from underneath us */
3156 wait_on_page_writeback(page
);
3158 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
3159 set_page_extent_mapped(page
);
3162 * we can't set the delalloc bits if there are pending ordered
3163 * extents. Drop our locks and wait for them to finish
3165 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
3167 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
3169 btrfs_start_ordered_extent(inode
, ordered
, 1);
3170 btrfs_put_ordered_extent(ordered
);
3174 btrfs_set_extent_delalloc(inode
, page_start
, page_end
);
3177 /* page is wholly or partially inside EOF */
3178 if (page_start
+ PAGE_CACHE_SIZE
> size
)
3179 zero_start
= size
& ~PAGE_CACHE_MASK
;
3181 zero_start
= PAGE_CACHE_SIZE
;
3183 if (zero_start
!= PAGE_CACHE_SIZE
) {
3185 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
3186 flush_dcache_page(page
);
3189 ClearPageChecked(page
);
3190 set_page_dirty(page
);
3191 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
3199 static void btrfs_truncate(struct inode
*inode
)
3201 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3203 struct btrfs_trans_handle
*trans
;
3205 u64 mask
= root
->sectorsize
- 1;
3207 if (!S_ISREG(inode
->i_mode
))
3209 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
3212 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
3213 btrfs_wait_ordered_range(inode
, inode
->i_size
& (~mask
), (u64
)-1);
3215 trans
= btrfs_start_transaction(root
, 1);
3216 btrfs_set_trans_block_group(trans
, inode
);
3217 btrfs_i_size_write(inode
, inode
->i_size
);
3219 ret
= btrfs_orphan_add(trans
, inode
);
3222 /* FIXME, add redo link to tree so we don't leak on crash */
3223 ret
= btrfs_truncate_in_trans(trans
, root
, inode
,
3224 BTRFS_EXTENT_DATA_KEY
);
3225 btrfs_update_inode(trans
, root
, inode
);
3227 ret
= btrfs_orphan_del(trans
, inode
);
3231 nr
= trans
->blocks_used
;
3232 ret
= btrfs_end_transaction_throttle(trans
, root
);
3234 btrfs_btree_balance_dirty(root
, nr
);
3238 * Invalidate a single dcache entry at the root of the filesystem.
3239 * Needed after creation of snapshot or subvolume.
3241 void btrfs_invalidate_dcache_root(struct btrfs_root
*root
, char *name
,
3244 struct dentry
*alias
, *entry
;
3247 alias
= d_find_alias(root
->fs_info
->sb
->s_root
->d_inode
);
3251 /* change me if btrfs ever gets a d_hash operation */
3252 qstr
.hash
= full_name_hash(qstr
.name
, qstr
.len
);
3253 entry
= d_lookup(alias
, &qstr
);
3256 d_invalidate(entry
);
3262 int btrfs_create_subvol_root(struct btrfs_root
*new_root
,
3263 struct btrfs_trans_handle
*trans
, u64 new_dirid
,
3264 struct btrfs_block_group_cache
*block_group
)
3266 struct inode
*inode
;
3269 inode
= btrfs_new_inode(trans
, new_root
, NULL
, "..", 2, new_dirid
,
3270 new_dirid
, block_group
, S_IFDIR
| 0700, &index
);
3272 return PTR_ERR(inode
);
3273 inode
->i_op
= &btrfs_dir_inode_operations
;
3274 inode
->i_fop
= &btrfs_dir_file_operations
;
3275 new_root
->inode
= inode
;
3278 btrfs_i_size_write(inode
, 0);
3280 return btrfs_update_inode(trans
, new_root
, inode
);
3283 unsigned long btrfs_force_ra(struct address_space
*mapping
,
3284 struct file_ra_state
*ra
, struct file
*file
,
3285 pgoff_t offset
, pgoff_t last_index
)
3287 pgoff_t req_size
= last_index
- offset
+ 1;
3289 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
3290 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
3293 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
3294 return offset
+ req_size
;
3298 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
3300 struct btrfs_inode
*ei
;
3302 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
3306 btrfs_ordered_inode_tree_init(&ei
->ordered_tree
);
3307 ei
->i_acl
= BTRFS_ACL_NOT_CACHED
;
3308 ei
->i_default_acl
= BTRFS_ACL_NOT_CACHED
;
3309 INIT_LIST_HEAD(&ei
->i_orphan
);
3310 return &ei
->vfs_inode
;
3313 void btrfs_destroy_inode(struct inode
*inode
)
3315 struct btrfs_ordered_extent
*ordered
;
3316 WARN_ON(!list_empty(&inode
->i_dentry
));
3317 WARN_ON(inode
->i_data
.nrpages
);
3319 if (BTRFS_I(inode
)->i_acl
&&
3320 BTRFS_I(inode
)->i_acl
!= BTRFS_ACL_NOT_CACHED
)
3321 posix_acl_release(BTRFS_I(inode
)->i_acl
);
3322 if (BTRFS_I(inode
)->i_default_acl
&&
3323 BTRFS_I(inode
)->i_default_acl
!= BTRFS_ACL_NOT_CACHED
)
3324 posix_acl_release(BTRFS_I(inode
)->i_default_acl
);
3326 spin_lock(&BTRFS_I(inode
)->root
->list_lock
);
3327 if (!list_empty(&BTRFS_I(inode
)->i_orphan
)) {
3328 printk(KERN_ERR
"BTRFS: inode %lu: inode still on the orphan"
3329 " list\n", inode
->i_ino
);
3332 spin_unlock(&BTRFS_I(inode
)->root
->list_lock
);
3335 ordered
= btrfs_lookup_first_ordered_extent(inode
, (u64
)-1);
3339 printk("found ordered extent %Lu %Lu\n",
3340 ordered
->file_offset
, ordered
->len
);
3341 btrfs_remove_ordered_extent(inode
, ordered
);
3342 btrfs_put_ordered_extent(ordered
);
3343 btrfs_put_ordered_extent(ordered
);
3346 btrfs_drop_extent_cache(inode
, 0, (u64
)-1);
3347 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
3350 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
3351 static void init_once(void *foo
)
3352 #elif LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3353 static void init_once(struct kmem_cache
* cachep
, void *foo
)
3355 static void init_once(void * foo
, struct kmem_cache
* cachep
,
3356 unsigned long flags
)
3359 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
3361 inode_init_once(&ei
->vfs_inode
);
3364 void btrfs_destroy_cachep(void)
3366 if (btrfs_inode_cachep
)
3367 kmem_cache_destroy(btrfs_inode_cachep
);
3368 if (btrfs_trans_handle_cachep
)
3369 kmem_cache_destroy(btrfs_trans_handle_cachep
);
3370 if (btrfs_transaction_cachep
)
3371 kmem_cache_destroy(btrfs_transaction_cachep
);
3372 if (btrfs_bit_radix_cachep
)
3373 kmem_cache_destroy(btrfs_bit_radix_cachep
);
3374 if (btrfs_path_cachep
)
3375 kmem_cache_destroy(btrfs_path_cachep
);
3378 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
3379 unsigned long extra_flags
,
3380 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
3381 void (*ctor
)(void *)
3382 #elif LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
3383 void (*ctor
)(struct kmem_cache
*, void *)
3385 void (*ctor
)(void *, struct kmem_cache
*,
3390 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
3391 SLAB_MEM_SPREAD
| extra_flags
), ctor
3392 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
3398 int btrfs_init_cachep(void)
3400 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
3401 sizeof(struct btrfs_inode
),
3403 if (!btrfs_inode_cachep
)
3405 btrfs_trans_handle_cachep
=
3406 btrfs_cache_create("btrfs_trans_handle_cache",
3407 sizeof(struct btrfs_trans_handle
),
3409 if (!btrfs_trans_handle_cachep
)
3411 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
3412 sizeof(struct btrfs_transaction
),
3414 if (!btrfs_transaction_cachep
)
3416 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
3417 sizeof(struct btrfs_path
),
3419 if (!btrfs_path_cachep
)
3421 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
3422 SLAB_DESTROY_BY_RCU
, NULL
);
3423 if (!btrfs_bit_radix_cachep
)
3427 btrfs_destroy_cachep();
3431 static int btrfs_getattr(struct vfsmount
*mnt
,
3432 struct dentry
*dentry
, struct kstat
*stat
)
3434 struct inode
*inode
= dentry
->d_inode
;
3435 generic_fillattr(inode
, stat
);
3436 stat
->blksize
= PAGE_CACHE_SIZE
;
3437 stat
->blocks
= inode
->i_blocks
+ (BTRFS_I(inode
)->delalloc_bytes
>> 9);
3441 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
3442 struct inode
* new_dir
,struct dentry
*new_dentry
)
3444 struct btrfs_trans_handle
*trans
;
3445 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
3446 struct inode
*new_inode
= new_dentry
->d_inode
;
3447 struct inode
*old_inode
= old_dentry
->d_inode
;
3448 struct timespec ctime
= CURRENT_TIME
;
3452 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
3453 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
3457 ret
= btrfs_check_free_space(root
, 1, 0);
3461 trans
= btrfs_start_transaction(root
, 1);
3463 btrfs_set_trans_block_group(trans
, new_dir
);
3465 old_dentry
->d_inode
->i_nlink
++;
3466 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
3467 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
3468 old_inode
->i_ctime
= ctime
;
3470 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
3475 new_inode
->i_ctime
= CURRENT_TIME
;
3476 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
3479 if (new_inode
->i_nlink
== 0) {
3480 ret
= btrfs_orphan_add(trans
, new_inode
);
3485 ret
= btrfs_set_inode_index(new_dir
, old_inode
, &index
);
3489 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
, 1, index
);
3494 btrfs_end_transaction_throttle(trans
, root
);
3499 int btrfs_start_delalloc_inodes(struct btrfs_root
*root
)
3501 struct list_head
*head
= &root
->fs_info
->delalloc_inodes
;
3502 struct btrfs_inode
*binode
;
3503 unsigned long flags
;
3505 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
3506 while(!list_empty(head
)) {
3507 binode
= list_entry(head
->next
, struct btrfs_inode
,
3509 atomic_inc(&binode
->vfs_inode
.i_count
);
3510 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
3511 filemap_write_and_wait(binode
->vfs_inode
.i_mapping
);
3512 iput(&binode
->vfs_inode
);
3513 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
3515 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
3519 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
3520 const char *symname
)
3522 struct btrfs_trans_handle
*trans
;
3523 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3524 struct btrfs_path
*path
;
3525 struct btrfs_key key
;
3526 struct inode
*inode
= NULL
;
3534 struct btrfs_file_extent_item
*ei
;
3535 struct extent_buffer
*leaf
;
3536 unsigned long nr
= 0;
3538 name_len
= strlen(symname
) + 1;
3539 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
3540 return -ENAMETOOLONG
;
3542 err
= btrfs_check_free_space(root
, 1, 0);
3546 trans
= btrfs_start_transaction(root
, 1);
3547 btrfs_set_trans_block_group(trans
, dir
);
3549 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
3555 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
3557 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
3558 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
,
3560 err
= PTR_ERR(inode
);
3564 err
= btrfs_init_acl(inode
, dir
);
3570 btrfs_set_trans_block_group(trans
, inode
);
3571 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0, index
);
3575 inode
->i_mapping
->a_ops
= &btrfs_aops
;
3576 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
3577 inode
->i_fop
= &btrfs_file_operations
;
3578 inode
->i_op
= &btrfs_file_inode_operations
;
3579 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
3580 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
3581 inode
->i_mapping
, GFP_NOFS
);
3582 extent_io_tree_init(&BTRFS_I(inode
)->io_failure_tree
,
3583 inode
->i_mapping
, GFP_NOFS
);
3584 INIT_LIST_HEAD(&BTRFS_I(inode
)->delalloc_inodes
);
3585 mutex_init(&BTRFS_I(inode
)->csum_mutex
);
3586 mutex_init(&BTRFS_I(inode
)->extent_mutex
);
3587 BTRFS_I(inode
)->delalloc_bytes
= 0;
3588 BTRFS_I(inode
)->disk_i_size
= 0;
3589 inode
->i_mapping
->writeback_index
= 0;
3590 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
3591 btrfs_ordered_inode_tree_init(&BTRFS_I(inode
)->ordered_tree
);
3593 dir
->i_sb
->s_dirt
= 1;
3594 btrfs_update_inode_block_group(trans
, inode
);
3595 btrfs_update_inode_block_group(trans
, dir
);
3599 path
= btrfs_alloc_path();
3601 key
.objectid
= inode
->i_ino
;
3603 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
3604 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
3605 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
3611 leaf
= path
->nodes
[0];
3612 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
3613 struct btrfs_file_extent_item
);
3614 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
3615 btrfs_set_file_extent_type(leaf
, ei
,
3616 BTRFS_FILE_EXTENT_INLINE
);
3617 ptr
= btrfs_file_extent_inline_start(ei
);
3618 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
3619 btrfs_mark_buffer_dirty(leaf
);
3620 btrfs_free_path(path
);
3622 inode
->i_op
= &btrfs_symlink_inode_operations
;
3623 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
3624 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
3625 btrfs_i_size_write(inode
, name_len
- 1);
3626 err
= btrfs_update_inode(trans
, root
, inode
);
3631 nr
= trans
->blocks_used
;
3632 btrfs_end_transaction_throttle(trans
, root
);
3635 inode_dec_link_count(inode
);
3638 btrfs_btree_balance_dirty(root
, nr
);
3642 static int btrfs_set_page_dirty(struct page
*page
)
3644 return __set_page_dirty_nobuffers(page
);
3647 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26)
3648 static int btrfs_permission(struct inode
*inode
, int mask
)
3650 static int btrfs_permission(struct inode
*inode
, int mask
,
3651 struct nameidata
*nd
)
3654 if (btrfs_test_flag(inode
, READONLY
) && (mask
& MAY_WRITE
))
3656 return generic_permission(inode
, mask
, btrfs_check_acl
);
3659 static struct inode_operations btrfs_dir_inode_operations
= {
3660 .lookup
= btrfs_lookup
,
3661 .create
= btrfs_create
,
3662 .unlink
= btrfs_unlink
,
3664 .mkdir
= btrfs_mkdir
,
3665 .rmdir
= btrfs_rmdir
,
3666 .rename
= btrfs_rename
,
3667 .symlink
= btrfs_symlink
,
3668 .setattr
= btrfs_setattr
,
3669 .mknod
= btrfs_mknod
,
3670 .setxattr
= generic_setxattr
,
3671 .getxattr
= generic_getxattr
,
3672 .listxattr
= btrfs_listxattr
,
3673 .removexattr
= generic_removexattr
,
3674 .permission
= btrfs_permission
,
3676 static struct inode_operations btrfs_dir_ro_inode_operations
= {
3677 .lookup
= btrfs_lookup
,
3678 .permission
= btrfs_permission
,
3680 static struct file_operations btrfs_dir_file_operations
= {
3681 .llseek
= generic_file_llseek
,
3682 .read
= generic_read_dir
,
3683 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
3684 .readdir
= btrfs_nfshack_readdir
,
3685 #else /* NFSd readdir/lookup deadlock is fixed */
3686 .readdir
= btrfs_real_readdir
,
3688 .unlocked_ioctl
= btrfs_ioctl
,
3689 #ifdef CONFIG_COMPAT
3690 .compat_ioctl
= btrfs_ioctl
,
3692 .release
= btrfs_release_file
,
3695 static struct extent_io_ops btrfs_extent_io_ops
= {
3696 .fill_delalloc
= run_delalloc_range
,
3697 .submit_bio_hook
= btrfs_submit_bio_hook
,
3698 .merge_bio_hook
= btrfs_merge_bio_hook
,
3699 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
3700 .writepage_end_io_hook
= btrfs_writepage_end_io_hook
,
3701 .writepage_start_hook
= btrfs_writepage_start_hook
,
3702 .readpage_io_failed_hook
= btrfs_io_failed_hook
,
3703 .set_bit_hook
= btrfs_set_bit_hook
,
3704 .clear_bit_hook
= btrfs_clear_bit_hook
,
3707 static struct address_space_operations btrfs_aops
= {
3708 .readpage
= btrfs_readpage
,
3709 .writepage
= btrfs_writepage
,
3710 .writepages
= btrfs_writepages
,
3711 .readpages
= btrfs_readpages
,
3712 .sync_page
= block_sync_page
,
3714 .direct_IO
= btrfs_direct_IO
,
3715 .invalidatepage
= btrfs_invalidatepage
,
3716 .releasepage
= btrfs_releasepage
,
3717 .set_page_dirty
= btrfs_set_page_dirty
,
3720 static struct address_space_operations btrfs_symlink_aops
= {
3721 .readpage
= btrfs_readpage
,
3722 .writepage
= btrfs_writepage
,
3723 .invalidatepage
= btrfs_invalidatepage
,
3724 .releasepage
= btrfs_releasepage
,
3727 static struct inode_operations btrfs_file_inode_operations
= {
3728 .truncate
= btrfs_truncate
,
3729 .getattr
= btrfs_getattr
,
3730 .setattr
= btrfs_setattr
,
3731 .setxattr
= generic_setxattr
,
3732 .getxattr
= generic_getxattr
,
3733 .listxattr
= btrfs_listxattr
,
3734 .removexattr
= generic_removexattr
,
3735 .permission
= btrfs_permission
,
3737 static struct inode_operations btrfs_special_inode_operations
= {
3738 .getattr
= btrfs_getattr
,
3739 .setattr
= btrfs_setattr
,
3740 .permission
= btrfs_permission
,
3741 .setxattr
= generic_setxattr
,
3742 .getxattr
= generic_getxattr
,
3743 .listxattr
= btrfs_listxattr
,
3744 .removexattr
= generic_removexattr
,
3746 static struct inode_operations btrfs_symlink_inode_operations
= {
3747 .readlink
= generic_readlink
,
3748 .follow_link
= page_follow_link_light
,
3749 .put_link
= page_put_link
,
3750 .permission
= btrfs_permission
,