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>
40 #include <linux/falloc.h>
43 #include "transaction.h"
44 #include "btrfs_inode.h"
46 #include "print-tree.h"
48 #include "ordered-data.h"
52 #include "ref-cache.h"
53 #include "compression.h"
55 struct btrfs_iget_args
{
57 struct btrfs_root
*root
;
60 static struct inode_operations btrfs_dir_inode_operations
;
61 static struct inode_operations btrfs_symlink_inode_operations
;
62 static struct inode_operations btrfs_dir_ro_inode_operations
;
63 static struct inode_operations btrfs_special_inode_operations
;
64 static struct inode_operations btrfs_file_inode_operations
;
65 static struct address_space_operations btrfs_aops
;
66 static struct address_space_operations btrfs_symlink_aops
;
67 static struct file_operations btrfs_dir_file_operations
;
68 static struct extent_io_ops btrfs_extent_io_ops
;
70 static struct kmem_cache
*btrfs_inode_cachep
;
71 struct kmem_cache
*btrfs_trans_handle_cachep
;
72 struct kmem_cache
*btrfs_transaction_cachep
;
73 struct kmem_cache
*btrfs_bit_radix_cachep
;
74 struct kmem_cache
*btrfs_path_cachep
;
77 static unsigned char btrfs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
78 [S_IFREG
>> S_SHIFT
] = BTRFS_FT_REG_FILE
,
79 [S_IFDIR
>> S_SHIFT
] = BTRFS_FT_DIR
,
80 [S_IFCHR
>> S_SHIFT
] = BTRFS_FT_CHRDEV
,
81 [S_IFBLK
>> S_SHIFT
] = BTRFS_FT_BLKDEV
,
82 [S_IFIFO
>> S_SHIFT
] = BTRFS_FT_FIFO
,
83 [S_IFSOCK
>> S_SHIFT
] = BTRFS_FT_SOCK
,
84 [S_IFLNK
>> S_SHIFT
] = BTRFS_FT_SYMLINK
,
87 static void btrfs_truncate(struct inode
*inode
);
88 static int btrfs_finish_ordered_io(struct inode
*inode
, u64 start
, u64 end
);
89 static noinline
int cow_file_range(struct inode
*inode
,
90 struct page
*locked_page
,
91 u64 start
, u64 end
, int *page_started
,
92 unsigned long *nr_written
, int unlock
);
95 * a very lame attempt at stopping writes when the FS is 85% full. There
96 * are countless ways this is incorrect, but it is better than nothing.
98 int btrfs_check_free_space(struct btrfs_root
*root
, u64 num_required
,
107 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
108 total
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
109 used
= btrfs_super_bytes_used(&root
->fs_info
->super_copy
);
117 if (used
+ root
->fs_info
->delalloc_bytes
+ num_required
> thresh
)
119 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
124 * this does all the hard work for inserting an inline extent into
125 * the btree. The caller should have done a btrfs_drop_extents so that
126 * no overlapping inline items exist in the btree
128 static int noinline
insert_inline_extent(struct btrfs_trans_handle
*trans
,
129 struct btrfs_root
*root
, struct inode
*inode
,
130 u64 start
, size_t size
, size_t compressed_size
,
131 struct page
**compressed_pages
)
133 struct btrfs_key key
;
134 struct btrfs_path
*path
;
135 struct extent_buffer
*leaf
;
136 struct page
*page
= NULL
;
139 struct btrfs_file_extent_item
*ei
;
142 size_t cur_size
= size
;
144 unsigned long offset
;
145 int use_compress
= 0;
147 if (compressed_size
&& compressed_pages
) {
149 cur_size
= compressed_size
;
152 path
= btrfs_alloc_path(); if (!path
)
155 btrfs_set_trans_block_group(trans
, inode
);
157 key
.objectid
= inode
->i_ino
;
159 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
160 inode_add_bytes(inode
, size
);
161 datasize
= btrfs_file_extent_calc_inline_size(cur_size
);
163 inode_add_bytes(inode
, size
);
164 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
169 printk("got bad ret %d\n", ret
);
172 leaf
= path
->nodes
[0];
173 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
174 struct btrfs_file_extent_item
);
175 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
176 btrfs_set_file_extent_type(leaf
, ei
, BTRFS_FILE_EXTENT_INLINE
);
177 btrfs_set_file_extent_encryption(leaf
, ei
, 0);
178 btrfs_set_file_extent_other_encoding(leaf
, ei
, 0);
179 btrfs_set_file_extent_ram_bytes(leaf
, ei
, size
);
180 ptr
= btrfs_file_extent_inline_start(ei
);
185 while(compressed_size
> 0) {
186 cpage
= compressed_pages
[i
];
187 cur_size
= min_t(unsigned long, compressed_size
,
191 write_extent_buffer(leaf
, kaddr
, ptr
, cur_size
);
196 compressed_size
-= cur_size
;
198 btrfs_set_file_extent_compression(leaf
, ei
,
199 BTRFS_COMPRESS_ZLIB
);
201 page
= find_get_page(inode
->i_mapping
,
202 start
>> PAGE_CACHE_SHIFT
);
203 btrfs_set_file_extent_compression(leaf
, ei
, 0);
204 kaddr
= kmap_atomic(page
, KM_USER0
);
205 offset
= start
& (PAGE_CACHE_SIZE
- 1);
206 write_extent_buffer(leaf
, kaddr
+ offset
, ptr
, size
);
207 kunmap_atomic(kaddr
, KM_USER0
);
208 page_cache_release(page
);
210 btrfs_mark_buffer_dirty(leaf
);
211 btrfs_free_path(path
);
213 BTRFS_I(inode
)->disk_i_size
= inode
->i_size
;
214 btrfs_update_inode(trans
, root
, inode
);
217 btrfs_free_path(path
);
223 * conditionally insert an inline extent into the file. This
224 * does the checks required to make sure the data is small enough
225 * to fit as an inline extent.
227 static int cow_file_range_inline(struct btrfs_trans_handle
*trans
,
228 struct btrfs_root
*root
,
229 struct inode
*inode
, u64 start
, u64 end
,
230 size_t compressed_size
,
231 struct page
**compressed_pages
)
233 u64 isize
= i_size_read(inode
);
234 u64 actual_end
= min(end
+ 1, isize
);
235 u64 inline_len
= actual_end
- start
;
236 u64 aligned_end
= (end
+ root
->sectorsize
- 1) &
237 ~((u64
)root
->sectorsize
- 1);
239 u64 data_len
= inline_len
;
243 data_len
= compressed_size
;
246 actual_end
>= PAGE_CACHE_SIZE
||
247 data_len
>= BTRFS_MAX_INLINE_DATA_SIZE(root
) ||
249 (actual_end
& (root
->sectorsize
- 1)) == 0) ||
251 data_len
> root
->fs_info
->max_inline
) {
255 ret
= btrfs_drop_extents(trans
, root
, inode
, start
,
256 aligned_end
, start
, &hint_byte
);
259 if (isize
> actual_end
)
260 inline_len
= min_t(u64
, isize
, actual_end
);
261 ret
= insert_inline_extent(trans
, root
, inode
, start
,
262 inline_len
, compressed_size
,
265 btrfs_drop_extent_cache(inode
, start
, aligned_end
, 0);
269 struct async_extent
{
274 unsigned long nr_pages
;
275 struct list_head list
;
280 struct btrfs_root
*root
;
281 struct page
*locked_page
;
284 struct list_head extents
;
285 struct btrfs_work work
;
288 static noinline
int add_async_extent(struct async_cow
*cow
,
289 u64 start
, u64 ram_size
,
292 unsigned long nr_pages
)
294 struct async_extent
*async_extent
;
296 async_extent
= kmalloc(sizeof(*async_extent
), GFP_NOFS
);
297 async_extent
->start
= start
;
298 async_extent
->ram_size
= ram_size
;
299 async_extent
->compressed_size
= compressed_size
;
300 async_extent
->pages
= pages
;
301 async_extent
->nr_pages
= nr_pages
;
302 list_add_tail(&async_extent
->list
, &cow
->extents
);
307 * we create compressed extents in two phases. The first
308 * phase compresses a range of pages that have already been
309 * locked (both pages and state bits are locked).
311 * This is done inside an ordered work queue, and the compression
312 * is spread across many cpus. The actual IO submission is step
313 * two, and the ordered work queue takes care of making sure that
314 * happens in the same order things were put onto the queue by
315 * writepages and friends.
317 * If this code finds it can't get good compression, it puts an
318 * entry onto the work queue to write the uncompressed bytes. This
319 * makes sure that both compressed inodes and uncompressed inodes
320 * are written in the same order that pdflush sent them down.
322 static noinline
int compress_file_range(struct inode
*inode
,
323 struct page
*locked_page
,
325 struct async_cow
*async_cow
,
328 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
329 struct btrfs_trans_handle
*trans
;
333 u64 blocksize
= root
->sectorsize
;
336 struct page
**pages
= NULL
;
337 unsigned long nr_pages
;
338 unsigned long nr_pages_ret
= 0;
339 unsigned long total_compressed
= 0;
340 unsigned long total_in
= 0;
341 unsigned long max_compressed
= 128 * 1024;
342 unsigned long max_uncompressed
= 128 * 1024;
350 nr_pages
= (end
>> PAGE_CACHE_SHIFT
) - (start
>> PAGE_CACHE_SHIFT
) + 1;
351 nr_pages
= min(nr_pages
, (128 * 1024UL) / PAGE_CACHE_SIZE
);
353 actual_end
= min_t(u64
, i_size_read(inode
), end
+ 1);
354 total_compressed
= actual_end
- start
;
356 /* we want to make sure that amount of ram required to uncompress
357 * an extent is reasonable, so we limit the total size in ram
358 * of a compressed extent to 128k. This is a crucial number
359 * because it also controls how easily we can spread reads across
360 * cpus for decompression.
362 * We also want to make sure the amount of IO required to do
363 * a random read is reasonably small, so we limit the size of
364 * a compressed extent to 128k.
366 total_compressed
= min(total_compressed
, max_uncompressed
);
367 num_bytes
= (end
- start
+ blocksize
) & ~(blocksize
- 1);
368 num_bytes
= max(blocksize
, num_bytes
);
369 disk_num_bytes
= num_bytes
;
374 * we do compression for mount -o compress and when the
375 * inode has not been flagged as nocompress. This flag can
376 * change at any time if we discover bad compression ratios.
378 if (!btrfs_test_flag(inode
, NOCOMPRESS
) &&
379 btrfs_test_opt(root
, COMPRESS
)) {
381 pages
= kzalloc(sizeof(struct page
*) * nr_pages
, GFP_NOFS
);
383 ret
= btrfs_zlib_compress_pages(inode
->i_mapping
, start
,
384 total_compressed
, pages
,
385 nr_pages
, &nr_pages_ret
,
391 unsigned long offset
= total_compressed
&
392 (PAGE_CACHE_SIZE
- 1);
393 struct page
*page
= pages
[nr_pages_ret
- 1];
396 /* zero the tail end of the last page, we might be
397 * sending it down to disk
400 kaddr
= kmap_atomic(page
, KM_USER0
);
401 memset(kaddr
+ offset
, 0,
402 PAGE_CACHE_SIZE
- offset
);
403 kunmap_atomic(kaddr
, KM_USER0
);
409 trans
= btrfs_join_transaction(root
, 1);
411 btrfs_set_trans_block_group(trans
, inode
);
413 /* lets try to make an inline extent */
414 if (ret
|| total_in
< (actual_end
- start
)) {
415 /* we didn't compress the entire range, try
416 * to make an uncompressed inline extent.
418 ret
= cow_file_range_inline(trans
, root
, inode
,
419 start
, end
, 0, NULL
);
421 /* try making a compressed inline extent */
422 ret
= cow_file_range_inline(trans
, root
, inode
,
424 total_compressed
, pages
);
426 btrfs_end_transaction(trans
, root
);
429 * inline extent creation worked, we don't need
430 * to create any more async work items. Unlock
431 * and free up our temp pages.
433 extent_clear_unlock_delalloc(inode
,
434 &BTRFS_I(inode
)->io_tree
,
435 start
, end
, NULL
, 1, 0,
444 * we aren't doing an inline extent round the compressed size
445 * up to a block size boundary so the allocator does sane
448 total_compressed
= (total_compressed
+ blocksize
- 1) &
452 * one last check to make sure the compression is really a
453 * win, compare the page count read with the blocks on disk
455 total_in
= (total_in
+ PAGE_CACHE_SIZE
- 1) &
456 ~(PAGE_CACHE_SIZE
- 1);
457 if (total_compressed
>= total_in
) {
460 disk_num_bytes
= total_compressed
;
461 num_bytes
= total_in
;
464 if (!will_compress
&& pages
) {
466 * the compression code ran but failed to make things smaller,
467 * free any pages it allocated and our page pointer array
469 for (i
= 0; i
< nr_pages_ret
; i
++) {
470 WARN_ON(pages
[i
]->mapping
);
471 page_cache_release(pages
[i
]);
475 total_compressed
= 0;
478 /* flag the file so we don't compress in the future */
479 btrfs_set_flag(inode
, NOCOMPRESS
);
484 /* the async work queues will take care of doing actual
485 * allocation on disk for these compressed pages,
486 * and will submit them to the elevator.
488 add_async_extent(async_cow
, start
, num_bytes
,
489 total_compressed
, pages
, nr_pages_ret
);
491 if (start
+ num_bytes
< end
) {
499 * No compression, but we still need to write the pages in
500 * the file we've been given so far. redirty the locked
501 * page if it corresponds to our extent and set things up
502 * for the async work queue to run cow_file_range to do
503 * the normal delalloc dance
505 if (page_offset(locked_page
) >= start
&&
506 page_offset(locked_page
) <= end
) {
507 __set_page_dirty_nobuffers(locked_page
);
508 /* unlocked later on in the async handlers */
510 add_async_extent(async_cow
, start
, end
- start
+ 1, 0, NULL
, 0);
518 for (i
= 0; i
< nr_pages_ret
; i
++) {
519 WARN_ON(pages
[i
]->mapping
);
520 page_cache_release(pages
[i
]);
529 * phase two of compressed writeback. This is the ordered portion
530 * of the code, which only gets called in the order the work was
531 * queued. We walk all the async extents created by compress_file_range
532 * and send them down to the disk.
534 static noinline
int submit_compressed_extents(struct inode
*inode
,
535 struct async_cow
*async_cow
)
537 struct async_extent
*async_extent
;
539 struct btrfs_trans_handle
*trans
;
540 struct btrfs_key ins
;
541 struct extent_map
*em
;
542 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
543 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
544 struct extent_io_tree
*io_tree
;
547 if (list_empty(&async_cow
->extents
))
550 trans
= btrfs_join_transaction(root
, 1);
552 while(!list_empty(&async_cow
->extents
)) {
553 async_extent
= list_entry(async_cow
->extents
.next
,
554 struct async_extent
, list
);
555 list_del(&async_extent
->list
);
557 io_tree
= &BTRFS_I(inode
)->io_tree
;
559 /* did the compression code fall back to uncompressed IO? */
560 if (!async_extent
->pages
) {
561 int page_started
= 0;
562 unsigned long nr_written
= 0;
564 lock_extent(io_tree
, async_extent
->start
,
565 async_extent
->start
+ async_extent
->ram_size
- 1,
568 /* allocate blocks */
569 cow_file_range(inode
, async_cow
->locked_page
,
571 async_extent
->start
+
572 async_extent
->ram_size
- 1,
573 &page_started
, &nr_written
, 0);
576 * if page_started, cow_file_range inserted an
577 * inline extent and took care of all the unlocking
578 * and IO for us. Otherwise, we need to submit
579 * all those pages down to the drive.
582 extent_write_locked_range(io_tree
,
583 inode
, async_extent
->start
,
584 async_extent
->start
+
585 async_extent
->ram_size
- 1,
593 lock_extent(io_tree
, async_extent
->start
,
594 async_extent
->start
+ async_extent
->ram_size
- 1,
597 * here we're doing allocation and writeback of the
600 btrfs_drop_extent_cache(inode
, async_extent
->start
,
601 async_extent
->start
+
602 async_extent
->ram_size
- 1, 0);
604 ret
= btrfs_reserve_extent(trans
, root
,
605 async_extent
->compressed_size
,
606 async_extent
->compressed_size
,
610 em
= alloc_extent_map(GFP_NOFS
);
611 em
->start
= async_extent
->start
;
612 em
->len
= async_extent
->ram_size
;
613 em
->orig_start
= em
->start
;
615 em
->block_start
= ins
.objectid
;
616 em
->block_len
= ins
.offset
;
617 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
618 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
619 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
622 spin_lock(&em_tree
->lock
);
623 ret
= add_extent_mapping(em_tree
, em
);
624 spin_unlock(&em_tree
->lock
);
625 if (ret
!= -EEXIST
) {
629 btrfs_drop_extent_cache(inode
, async_extent
->start
,
630 async_extent
->start
+
631 async_extent
->ram_size
- 1, 0);
634 ret
= btrfs_add_ordered_extent(inode
, async_extent
->start
,
636 async_extent
->ram_size
,
638 BTRFS_ORDERED_COMPRESSED
);
641 btrfs_end_transaction(trans
, root
);
644 * clear dirty, set writeback and unlock the pages.
646 extent_clear_unlock_delalloc(inode
,
647 &BTRFS_I(inode
)->io_tree
,
649 async_extent
->start
+
650 async_extent
->ram_size
- 1,
651 NULL
, 1, 1, 0, 1, 1, 0);
653 ret
= btrfs_submit_compressed_write(inode
,
655 async_extent
->ram_size
,
657 ins
.offset
, async_extent
->pages
,
658 async_extent
->nr_pages
);
661 trans
= btrfs_join_transaction(root
, 1);
662 alloc_hint
= ins
.objectid
+ ins
.offset
;
667 btrfs_end_transaction(trans
, root
);
672 * when extent_io.c finds a delayed allocation range in the file,
673 * the call backs end up in this code. The basic idea is to
674 * allocate extents on disk for the range, and create ordered data structs
675 * in ram to track those extents.
677 * locked_page is the page that writepage had locked already. We use
678 * it to make sure we don't do extra locks or unlocks.
680 * *page_started is set to one if we unlock locked_page and do everything
681 * required to start IO on it. It may be clean and already done with
684 static noinline
int cow_file_range(struct inode
*inode
,
685 struct page
*locked_page
,
686 u64 start
, u64 end
, int *page_started
,
687 unsigned long *nr_written
,
690 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
691 struct btrfs_trans_handle
*trans
;
694 unsigned long ram_size
;
697 u64 blocksize
= root
->sectorsize
;
699 struct btrfs_key ins
;
700 struct extent_map
*em
;
701 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
704 trans
= btrfs_join_transaction(root
, 1);
706 btrfs_set_trans_block_group(trans
, inode
);
708 actual_end
= min_t(u64
, i_size_read(inode
), end
+ 1);
710 num_bytes
= (end
- start
+ blocksize
) & ~(blocksize
- 1);
711 num_bytes
= max(blocksize
, num_bytes
);
712 disk_num_bytes
= num_bytes
;
716 /* lets try to make an inline extent */
717 ret
= cow_file_range_inline(trans
, root
, inode
,
718 start
, end
, 0, NULL
);
720 extent_clear_unlock_delalloc(inode
,
721 &BTRFS_I(inode
)->io_tree
,
722 start
, end
, NULL
, 1, 1,
724 *nr_written
= *nr_written
+
725 (end
- start
+ PAGE_CACHE_SIZE
) / PAGE_CACHE_SIZE
;
732 BUG_ON(disk_num_bytes
>
733 btrfs_super_total_bytes(&root
->fs_info
->super_copy
));
735 btrfs_drop_extent_cache(inode
, start
, start
+ num_bytes
- 1, 0);
737 while(disk_num_bytes
> 0) {
738 cur_alloc_size
= min(disk_num_bytes
, root
->fs_info
->max_extent
);
739 ret
= btrfs_reserve_extent(trans
, root
, cur_alloc_size
,
740 root
->sectorsize
, 0, alloc_hint
,
745 em
= alloc_extent_map(GFP_NOFS
);
747 em
->orig_start
= em
->start
;
749 ram_size
= ins
.offset
;
750 em
->len
= ins
.offset
;
752 em
->block_start
= ins
.objectid
;
753 em
->block_len
= ins
.offset
;
754 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
755 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
758 spin_lock(&em_tree
->lock
);
759 ret
= add_extent_mapping(em_tree
, em
);
760 spin_unlock(&em_tree
->lock
);
761 if (ret
!= -EEXIST
) {
765 btrfs_drop_extent_cache(inode
, start
,
766 start
+ ram_size
- 1, 0);
769 cur_alloc_size
= ins
.offset
;
770 ret
= btrfs_add_ordered_extent(inode
, start
, ins
.objectid
,
771 ram_size
, cur_alloc_size
, 0);
774 if (disk_num_bytes
< cur_alloc_size
) {
775 printk("num_bytes %Lu cur_alloc %Lu\n", disk_num_bytes
,
779 /* we're not doing compressed IO, don't unlock the first
780 * page (which the caller expects to stay locked), don't
781 * clear any dirty bits and don't set any writeback bits
783 extent_clear_unlock_delalloc(inode
, &BTRFS_I(inode
)->io_tree
,
784 start
, start
+ ram_size
- 1,
785 locked_page
, unlock
, 1,
787 disk_num_bytes
-= cur_alloc_size
;
788 num_bytes
-= cur_alloc_size
;
789 alloc_hint
= ins
.objectid
+ ins
.offset
;
790 start
+= cur_alloc_size
;
794 btrfs_end_transaction(trans
, root
);
800 * work queue call back to started compression on a file and pages
802 static noinline
void async_cow_start(struct btrfs_work
*work
)
804 struct async_cow
*async_cow
;
806 async_cow
= container_of(work
, struct async_cow
, work
);
808 compress_file_range(async_cow
->inode
, async_cow
->locked_page
,
809 async_cow
->start
, async_cow
->end
, async_cow
,
812 async_cow
->inode
= NULL
;
816 * work queue call back to submit previously compressed pages
818 static noinline
void async_cow_submit(struct btrfs_work
*work
)
820 struct async_cow
*async_cow
;
821 struct btrfs_root
*root
;
822 unsigned long nr_pages
;
824 async_cow
= container_of(work
, struct async_cow
, work
);
826 root
= async_cow
->root
;
827 nr_pages
= (async_cow
->end
- async_cow
->start
+ PAGE_CACHE_SIZE
) >>
830 atomic_sub(nr_pages
, &root
->fs_info
->async_delalloc_pages
);
832 if (atomic_read(&root
->fs_info
->async_delalloc_pages
) <
834 waitqueue_active(&root
->fs_info
->async_submit_wait
))
835 wake_up(&root
->fs_info
->async_submit_wait
);
837 if (async_cow
->inode
) {
838 submit_compressed_extents(async_cow
->inode
, async_cow
);
842 static noinline
void async_cow_free(struct btrfs_work
*work
)
844 struct async_cow
*async_cow
;
845 async_cow
= container_of(work
, struct async_cow
, work
);
849 static int cow_file_range_async(struct inode
*inode
, struct page
*locked_page
,
850 u64 start
, u64 end
, int *page_started
,
851 unsigned long *nr_written
)
853 struct async_cow
*async_cow
;
854 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
855 unsigned long nr_pages
;
857 int limit
= 10 * 1024 * 1042;
859 if (!btrfs_test_opt(root
, COMPRESS
)) {
860 return cow_file_range(inode
, locked_page
, start
, end
,
861 page_started
, nr_written
, 1);
864 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, start
, end
, EXTENT_LOCKED
|
865 EXTENT_DELALLOC
, 1, 0, GFP_NOFS
);
867 async_cow
= kmalloc(sizeof(*async_cow
), GFP_NOFS
);
868 async_cow
->inode
= inode
;
869 async_cow
->root
= root
;
870 async_cow
->locked_page
= locked_page
;
871 async_cow
->start
= start
;
873 if (btrfs_test_flag(inode
, NOCOMPRESS
))
876 cur_end
= min(end
, start
+ 512 * 1024 - 1);
878 async_cow
->end
= cur_end
;
879 INIT_LIST_HEAD(&async_cow
->extents
);
881 async_cow
->work
.func
= async_cow_start
;
882 async_cow
->work
.ordered_func
= async_cow_submit
;
883 async_cow
->work
.ordered_free
= async_cow_free
;
884 async_cow
->work
.flags
= 0;
886 while(atomic_read(&root
->fs_info
->async_submit_draining
) &&
887 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
888 wait_event(root
->fs_info
->async_submit_wait
,
889 (atomic_read(&root
->fs_info
->async_delalloc_pages
)
893 nr_pages
= (cur_end
- start
+ PAGE_CACHE_SIZE
) >>
895 atomic_add(nr_pages
, &root
->fs_info
->async_delalloc_pages
);
897 btrfs_queue_worker(&root
->fs_info
->delalloc_workers
,
900 if (atomic_read(&root
->fs_info
->async_delalloc_pages
) > limit
) {
901 wait_event(root
->fs_info
->async_submit_wait
,
902 (atomic_read(&root
->fs_info
->async_delalloc_pages
) <
906 while(atomic_read(&root
->fs_info
->async_submit_draining
) &&
907 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
908 wait_event(root
->fs_info
->async_submit_wait
,
909 (atomic_read(&root
->fs_info
->async_delalloc_pages
) ==
913 *nr_written
+= nr_pages
;
921 * when nowcow writeback call back. This checks for snapshots or COW copies
922 * of the extents that exist in the file, and COWs the file as required.
924 * If no cow copies or snapshots exist, we write directly to the existing
927 static int run_delalloc_nocow(struct inode
*inode
, struct page
*locked_page
,
928 u64 start
, u64 end
, int *page_started
, int force
,
929 unsigned long *nr_written
)
931 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
932 struct btrfs_trans_handle
*trans
;
933 struct extent_buffer
*leaf
;
934 struct btrfs_path
*path
;
935 struct btrfs_file_extent_item
*fi
;
936 struct btrfs_key found_key
;
948 path
= btrfs_alloc_path();
950 trans
= btrfs_join_transaction(root
, 1);
956 ret
= btrfs_lookup_file_extent(trans
, root
, path
, inode
->i_ino
,
959 if (ret
> 0 && path
->slots
[0] > 0 && check_prev
) {
960 leaf
= path
->nodes
[0];
961 btrfs_item_key_to_cpu(leaf
, &found_key
,
963 if (found_key
.objectid
== inode
->i_ino
&&
964 found_key
.type
== BTRFS_EXTENT_DATA_KEY
)
969 leaf
= path
->nodes
[0];
970 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
971 ret
= btrfs_next_leaf(root
, path
);
976 leaf
= path
->nodes
[0];
981 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
983 if (found_key
.objectid
> inode
->i_ino
||
984 found_key
.type
> BTRFS_EXTENT_DATA_KEY
||
985 found_key
.offset
> end
)
988 if (found_key
.offset
> cur_offset
) {
989 extent_end
= found_key
.offset
;
993 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
994 struct btrfs_file_extent_item
);
995 extent_type
= btrfs_file_extent_type(leaf
, fi
);
997 if (extent_type
== BTRFS_FILE_EXTENT_REG
||
998 extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
999 struct btrfs_block_group_cache
*block_group
;
1000 disk_bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
1001 extent_end
= found_key
.offset
+
1002 btrfs_file_extent_num_bytes(leaf
, fi
);
1003 if (extent_end
<= start
) {
1007 if (btrfs_file_extent_compression(leaf
, fi
) ||
1008 btrfs_file_extent_encryption(leaf
, fi
) ||
1009 btrfs_file_extent_other_encoding(leaf
, fi
))
1011 if (disk_bytenr
== 0)
1013 if (extent_type
== BTRFS_FILE_EXTENT_REG
&& !force
)
1015 if (btrfs_cross_ref_exist(trans
, root
, disk_bytenr
))
1017 block_group
= btrfs_lookup_block_group(root
->fs_info
,
1019 if (!block_group
|| block_group
->ro
)
1021 disk_bytenr
+= btrfs_file_extent_offset(leaf
, fi
);
1023 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
1024 extent_end
= found_key
.offset
+
1025 btrfs_file_extent_inline_len(leaf
, fi
);
1026 extent_end
= ALIGN(extent_end
, root
->sectorsize
);
1031 if (extent_end
<= start
) {
1036 if (cow_start
== (u64
)-1)
1037 cow_start
= cur_offset
;
1038 cur_offset
= extent_end
;
1039 if (cur_offset
> end
)
1045 btrfs_release_path(root
, path
);
1046 if (cow_start
!= (u64
)-1) {
1047 ret
= cow_file_range(inode
, locked_page
, cow_start
,
1048 found_key
.offset
- 1, page_started
,
1051 cow_start
= (u64
)-1;
1054 disk_bytenr
+= cur_offset
- found_key
.offset
;
1055 num_bytes
= min(end
+ 1, extent_end
) - cur_offset
;
1056 if (extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1057 struct extent_map
*em
;
1058 struct extent_map_tree
*em_tree
;
1059 em_tree
= &BTRFS_I(inode
)->extent_tree
;
1060 em
= alloc_extent_map(GFP_NOFS
);
1061 em
->start
= cur_offset
;
1062 em
->orig_start
= em
->start
;
1063 em
->len
= num_bytes
;
1064 em
->block_len
= num_bytes
;
1065 em
->block_start
= disk_bytenr
;
1066 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
1067 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
1069 spin_lock(&em_tree
->lock
);
1070 ret
= add_extent_mapping(em_tree
, em
);
1071 spin_unlock(&em_tree
->lock
);
1072 if (ret
!= -EEXIST
) {
1073 free_extent_map(em
);
1076 btrfs_drop_extent_cache(inode
, em
->start
,
1077 em
->start
+ em
->len
- 1, 0);
1079 type
= BTRFS_ORDERED_PREALLOC
;
1081 type
= BTRFS_ORDERED_NOCOW
;
1084 ret
= btrfs_add_ordered_extent(inode
, cur_offset
, disk_bytenr
,
1085 num_bytes
, num_bytes
, type
);
1088 extent_clear_unlock_delalloc(inode
, &BTRFS_I(inode
)->io_tree
,
1089 cur_offset
, cur_offset
+ num_bytes
- 1,
1090 locked_page
, 1, 1, 1, 0, 0, 0);
1091 cur_offset
= extent_end
;
1092 if (cur_offset
> end
)
1095 btrfs_release_path(root
, path
);
1097 if (cur_offset
<= end
&& cow_start
== (u64
)-1)
1098 cow_start
= cur_offset
;
1099 if (cow_start
!= (u64
)-1) {
1100 ret
= cow_file_range(inode
, locked_page
, cow_start
, end
,
1101 page_started
, nr_written
, 1);
1105 ret
= btrfs_end_transaction(trans
, root
);
1107 btrfs_free_path(path
);
1112 * extent_io.c call back to do delayed allocation processing
1114 static int run_delalloc_range(struct inode
*inode
, struct page
*locked_page
,
1115 u64 start
, u64 end
, int *page_started
,
1116 unsigned long *nr_written
)
1118 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1121 if (btrfs_test_opt(root
, NODATACOW
) ||
1122 btrfs_test_flag(inode
, NODATACOW
))
1123 ret
= run_delalloc_nocow(inode
, locked_page
, start
, end
,
1124 page_started
, 0, nr_written
);
1125 else if (btrfs_test_flag(inode
, PREALLOC
))
1126 ret
= run_delalloc_nocow(inode
, locked_page
, start
, end
,
1127 page_started
, 1, nr_written
);
1129 ret
= cow_file_range_async(inode
, locked_page
, start
, end
,
1130 page_started
, nr_written
);
1136 * extent_io.c set_bit_hook, used to track delayed allocation
1137 * bytes in this file, and to maintain the list of inodes that
1138 * have pending delalloc work to be done.
1140 int btrfs_set_bit_hook(struct inode
*inode
, u64 start
, u64 end
,
1141 unsigned long old
, unsigned long bits
)
1143 unsigned long flags
;
1144 if (!(old
& EXTENT_DELALLOC
) && (bits
& EXTENT_DELALLOC
)) {
1145 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1146 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
1147 BTRFS_I(inode
)->delalloc_bytes
+= end
- start
+ 1;
1148 root
->fs_info
->delalloc_bytes
+= end
- start
+ 1;
1149 if (list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
1150 list_add_tail(&BTRFS_I(inode
)->delalloc_inodes
,
1151 &root
->fs_info
->delalloc_inodes
);
1153 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
1159 * extent_io.c clear_bit_hook, see set_bit_hook for why
1161 int btrfs_clear_bit_hook(struct inode
*inode
, u64 start
, u64 end
,
1162 unsigned long old
, unsigned long bits
)
1164 if ((old
& EXTENT_DELALLOC
) && (bits
& EXTENT_DELALLOC
)) {
1165 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1166 unsigned long flags
;
1168 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
1169 if (end
- start
+ 1 > root
->fs_info
->delalloc_bytes
) {
1170 printk("warning: delalloc account %Lu %Lu\n",
1171 end
- start
+ 1, root
->fs_info
->delalloc_bytes
);
1172 root
->fs_info
->delalloc_bytes
= 0;
1173 BTRFS_I(inode
)->delalloc_bytes
= 0;
1175 root
->fs_info
->delalloc_bytes
-= end
- start
+ 1;
1176 BTRFS_I(inode
)->delalloc_bytes
-= end
- start
+ 1;
1178 if (BTRFS_I(inode
)->delalloc_bytes
== 0 &&
1179 !list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
1180 list_del_init(&BTRFS_I(inode
)->delalloc_inodes
);
1182 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
1188 * extent_io.c merge_bio_hook, this must check the chunk tree to make sure
1189 * we don't create bios that span stripes or chunks
1191 int btrfs_merge_bio_hook(struct page
*page
, unsigned long offset
,
1192 size_t size
, struct bio
*bio
,
1193 unsigned long bio_flags
)
1195 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
1196 struct btrfs_mapping_tree
*map_tree
;
1197 u64 logical
= (u64
)bio
->bi_sector
<< 9;
1202 if (bio_flags
& EXTENT_BIO_COMPRESSED
)
1205 length
= bio
->bi_size
;
1206 map_tree
= &root
->fs_info
->mapping_tree
;
1207 map_length
= length
;
1208 ret
= btrfs_map_block(map_tree
, READ
, logical
,
1209 &map_length
, NULL
, 0);
1211 if (map_length
< length
+ size
) {
1218 * in order to insert checksums into the metadata in large chunks,
1219 * we wait until bio submission time. All the pages in the bio are
1220 * checksummed and sums are attached onto the ordered extent record.
1222 * At IO completion time the cums attached on the ordered extent record
1223 * are inserted into the btree
1225 int __btrfs_submit_bio_start(struct inode
*inode
, int rw
, struct bio
*bio
,
1226 int mirror_num
, unsigned long bio_flags
)
1228 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1231 ret
= btrfs_csum_one_bio(root
, inode
, bio
);
1237 * in order to insert checksums into the metadata in large chunks,
1238 * we wait until bio submission time. All the pages in the bio are
1239 * checksummed and sums are attached onto the ordered extent record.
1241 * At IO completion time the cums attached on the ordered extent record
1242 * are inserted into the btree
1244 int __btrfs_submit_bio_done(struct inode
*inode
, int rw
, struct bio
*bio
,
1245 int mirror_num
, unsigned long bio_flags
)
1247 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1248 return btrfs_map_bio(root
, rw
, bio
, mirror_num
, 1);
1252 * extent_io.c submission hook. This does the right thing for csum calculation on write,
1253 * or reading the csums from the tree before a read
1255 int btrfs_submit_bio_hook(struct inode
*inode
, int rw
, struct bio
*bio
,
1256 int mirror_num
, unsigned long bio_flags
)
1258 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1262 ret
= btrfs_bio_wq_end_io(root
->fs_info
, bio
, 0);
1265 skip_sum
= btrfs_test_opt(root
, NODATASUM
) ||
1266 btrfs_test_flag(inode
, NODATASUM
);
1268 if (!(rw
& (1 << BIO_RW
))) {
1270 if (bio_flags
& EXTENT_BIO_COMPRESSED
)
1271 return btrfs_submit_compressed_read(inode
, bio
,
1272 mirror_num
, bio_flags
);
1274 btrfs_lookup_bio_sums(root
, inode
, bio
);
1276 } else if (!skip_sum
) {
1277 /* we're doing a write, do the async checksumming */
1278 return btrfs_wq_submit_bio(BTRFS_I(inode
)->root
->fs_info
,
1279 inode
, rw
, bio
, mirror_num
,
1280 bio_flags
, __btrfs_submit_bio_start
,
1281 __btrfs_submit_bio_done
);
1285 return btrfs_map_bio(root
, rw
, bio
, mirror_num
, 0);
1289 * given a list of ordered sums record them in the inode. This happens
1290 * at IO completion time based on sums calculated at bio submission time.
1292 static noinline
int add_pending_csums(struct btrfs_trans_handle
*trans
,
1293 struct inode
*inode
, u64 file_offset
,
1294 struct list_head
*list
)
1296 struct list_head
*cur
;
1297 struct btrfs_ordered_sum
*sum
;
1299 btrfs_set_trans_block_group(trans
, inode
);
1300 list_for_each(cur
, list
) {
1301 sum
= list_entry(cur
, struct btrfs_ordered_sum
, list
);
1302 btrfs_csum_file_blocks(trans
, BTRFS_I(inode
)->root
,
1308 int btrfs_set_extent_delalloc(struct inode
*inode
, u64 start
, u64 end
)
1310 if ((end
& (PAGE_CACHE_SIZE
- 1)) == 0) {
1313 return set_extent_delalloc(&BTRFS_I(inode
)->io_tree
, start
, end
,
1317 /* see btrfs_writepage_start_hook for details on why this is required */
1318 struct btrfs_writepage_fixup
{
1320 struct btrfs_work work
;
1323 void btrfs_writepage_fixup_worker(struct btrfs_work
*work
)
1325 struct btrfs_writepage_fixup
*fixup
;
1326 struct btrfs_ordered_extent
*ordered
;
1328 struct inode
*inode
;
1332 fixup
= container_of(work
, struct btrfs_writepage_fixup
, work
);
1336 if (!page
->mapping
|| !PageDirty(page
) || !PageChecked(page
)) {
1337 ClearPageChecked(page
);
1341 inode
= page
->mapping
->host
;
1342 page_start
= page_offset(page
);
1343 page_end
= page_offset(page
) + PAGE_CACHE_SIZE
- 1;
1345 lock_extent(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
, GFP_NOFS
);
1347 /* already ordered? We're done */
1348 if (test_range_bit(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
,
1349 EXTENT_ORDERED
, 0)) {
1353 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
1355 unlock_extent(&BTRFS_I(inode
)->io_tree
, page_start
,
1356 page_end
, GFP_NOFS
);
1358 btrfs_start_ordered_extent(inode
, ordered
, 1);
1362 btrfs_set_extent_delalloc(inode
, page_start
, page_end
);
1363 ClearPageChecked(page
);
1365 unlock_extent(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
, GFP_NOFS
);
1368 page_cache_release(page
);
1372 * There are a few paths in the higher layers of the kernel that directly
1373 * set the page dirty bit without asking the filesystem if it is a
1374 * good idea. This causes problems because we want to make sure COW
1375 * properly happens and the data=ordered rules are followed.
1377 * In our case any range that doesn't have the ORDERED bit set
1378 * hasn't been properly setup for IO. We kick off an async process
1379 * to fix it up. The async helper will wait for ordered extents, set
1380 * the delalloc bit and make it safe to write the page.
1382 int btrfs_writepage_start_hook(struct page
*page
, u64 start
, u64 end
)
1384 struct inode
*inode
= page
->mapping
->host
;
1385 struct btrfs_writepage_fixup
*fixup
;
1386 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1389 ret
= test_range_bit(&BTRFS_I(inode
)->io_tree
, start
, end
,
1394 if (PageChecked(page
))
1397 fixup
= kzalloc(sizeof(*fixup
), GFP_NOFS
);
1401 SetPageChecked(page
);
1402 page_cache_get(page
);
1403 fixup
->work
.func
= btrfs_writepage_fixup_worker
;
1405 btrfs_queue_worker(&root
->fs_info
->fixup_workers
, &fixup
->work
);
1409 static int insert_reserved_file_extent(struct btrfs_trans_handle
*trans
,
1410 struct inode
*inode
, u64 file_pos
,
1411 u64 disk_bytenr
, u64 disk_num_bytes
,
1412 u64 num_bytes
, u64 ram_bytes
,
1413 u8 compression
, u8 encryption
,
1414 u16 other_encoding
, int extent_type
)
1416 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1417 struct btrfs_file_extent_item
*fi
;
1418 struct btrfs_path
*path
;
1419 struct extent_buffer
*leaf
;
1420 struct btrfs_key ins
;
1424 path
= btrfs_alloc_path();
1427 ret
= btrfs_drop_extents(trans
, root
, inode
, file_pos
,
1428 file_pos
+ num_bytes
, file_pos
, &hint
);
1431 ins
.objectid
= inode
->i_ino
;
1432 ins
.offset
= file_pos
;
1433 ins
.type
= BTRFS_EXTENT_DATA_KEY
;
1434 ret
= btrfs_insert_empty_item(trans
, root
, path
, &ins
, sizeof(*fi
));
1436 leaf
= path
->nodes
[0];
1437 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
1438 struct btrfs_file_extent_item
);
1439 btrfs_set_file_extent_generation(leaf
, fi
, trans
->transid
);
1440 btrfs_set_file_extent_type(leaf
, fi
, extent_type
);
1441 btrfs_set_file_extent_disk_bytenr(leaf
, fi
, disk_bytenr
);
1442 btrfs_set_file_extent_disk_num_bytes(leaf
, fi
, disk_num_bytes
);
1443 btrfs_set_file_extent_offset(leaf
, fi
, 0);
1444 btrfs_set_file_extent_num_bytes(leaf
, fi
, num_bytes
);
1445 btrfs_set_file_extent_ram_bytes(leaf
, fi
, ram_bytes
);
1446 btrfs_set_file_extent_compression(leaf
, fi
, compression
);
1447 btrfs_set_file_extent_encryption(leaf
, fi
, encryption
);
1448 btrfs_set_file_extent_other_encoding(leaf
, fi
, other_encoding
);
1449 btrfs_mark_buffer_dirty(leaf
);
1451 inode_add_bytes(inode
, num_bytes
);
1452 btrfs_drop_extent_cache(inode
, file_pos
, file_pos
+ num_bytes
- 1, 0);
1454 ins
.objectid
= disk_bytenr
;
1455 ins
.offset
= disk_num_bytes
;
1456 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
1457 ret
= btrfs_alloc_reserved_extent(trans
, root
, leaf
->start
,
1458 root
->root_key
.objectid
,
1459 trans
->transid
, inode
->i_ino
, &ins
);
1462 btrfs_free_path(path
);
1466 /* as ordered data IO finishes, this gets called so we can finish
1467 * an ordered extent if the range of bytes in the file it covers are
1470 static int btrfs_finish_ordered_io(struct inode
*inode
, u64 start
, u64 end
)
1472 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1473 struct btrfs_trans_handle
*trans
;
1474 struct btrfs_ordered_extent
*ordered_extent
;
1475 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1479 ret
= btrfs_dec_test_ordered_pending(inode
, start
, end
- start
+ 1);
1483 trans
= btrfs_join_transaction(root
, 1);
1485 ordered_extent
= btrfs_lookup_ordered_extent(inode
, start
);
1486 BUG_ON(!ordered_extent
);
1487 if (test_bit(BTRFS_ORDERED_NOCOW
, &ordered_extent
->flags
))
1490 lock_extent(io_tree
, ordered_extent
->file_offset
,
1491 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
1494 if (test_bit(BTRFS_ORDERED_COMPRESSED
, &ordered_extent
->flags
))
1496 if (test_bit(BTRFS_ORDERED_PREALLOC
, &ordered_extent
->flags
)) {
1498 ret
= btrfs_mark_extent_written(trans
, root
, inode
,
1499 ordered_extent
->file_offset
,
1500 ordered_extent
->file_offset
+
1501 ordered_extent
->len
);
1504 ret
= insert_reserved_file_extent(trans
, inode
,
1505 ordered_extent
->file_offset
,
1506 ordered_extent
->start
,
1507 ordered_extent
->disk_len
,
1508 ordered_extent
->len
,
1509 ordered_extent
->len
,
1511 BTRFS_FILE_EXTENT_REG
);
1514 unlock_extent(io_tree
, ordered_extent
->file_offset
,
1515 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
1518 add_pending_csums(trans
, inode
, ordered_extent
->file_offset
,
1519 &ordered_extent
->list
);
1521 mutex_lock(&BTRFS_I(inode
)->extent_mutex
);
1522 btrfs_ordered_update_i_size(inode
, ordered_extent
);
1523 btrfs_update_inode(trans
, root
, inode
);
1524 btrfs_remove_ordered_extent(inode
, ordered_extent
);
1525 mutex_unlock(&BTRFS_I(inode
)->extent_mutex
);
1528 btrfs_put_ordered_extent(ordered_extent
);
1529 /* once for the tree */
1530 btrfs_put_ordered_extent(ordered_extent
);
1532 btrfs_end_transaction(trans
, root
);
1536 int btrfs_writepage_end_io_hook(struct page
*page
, u64 start
, u64 end
,
1537 struct extent_state
*state
, int uptodate
)
1539 return btrfs_finish_ordered_io(page
->mapping
->host
, start
, end
);
1543 * When IO fails, either with EIO or csum verification fails, we
1544 * try other mirrors that might have a good copy of the data. This
1545 * io_failure_record is used to record state as we go through all the
1546 * mirrors. If another mirror has good data, the page is set up to date
1547 * and things continue. If a good mirror can't be found, the original
1548 * bio end_io callback is called to indicate things have failed.
1550 struct io_failure_record
{
1558 int btrfs_io_failed_hook(struct bio
*failed_bio
,
1559 struct page
*page
, u64 start
, u64 end
,
1560 struct extent_state
*state
)
1562 struct io_failure_record
*failrec
= NULL
;
1564 struct extent_map
*em
;
1565 struct inode
*inode
= page
->mapping
->host
;
1566 struct extent_io_tree
*failure_tree
= &BTRFS_I(inode
)->io_failure_tree
;
1567 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1573 unsigned long bio_flags
= 0;
1575 ret
= get_state_private(failure_tree
, start
, &private);
1577 failrec
= kmalloc(sizeof(*failrec
), GFP_NOFS
);
1580 failrec
->start
= start
;
1581 failrec
->len
= end
- start
+ 1;
1582 failrec
->last_mirror
= 0;
1584 spin_lock(&em_tree
->lock
);
1585 em
= lookup_extent_mapping(em_tree
, start
, failrec
->len
);
1586 if (em
->start
> start
|| em
->start
+ em
->len
< start
) {
1587 free_extent_map(em
);
1590 spin_unlock(&em_tree
->lock
);
1592 if (!em
|| IS_ERR(em
)) {
1596 logical
= start
- em
->start
;
1597 logical
= em
->block_start
+ logical
;
1598 if (test_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
))
1599 bio_flags
= EXTENT_BIO_COMPRESSED
;
1600 failrec
->logical
= logical
;
1601 free_extent_map(em
);
1602 set_extent_bits(failure_tree
, start
, end
, EXTENT_LOCKED
|
1603 EXTENT_DIRTY
, GFP_NOFS
);
1604 set_state_private(failure_tree
, start
,
1605 (u64
)(unsigned long)failrec
);
1607 failrec
= (struct io_failure_record
*)(unsigned long)private;
1609 num_copies
= btrfs_num_copies(
1610 &BTRFS_I(inode
)->root
->fs_info
->mapping_tree
,
1611 failrec
->logical
, failrec
->len
);
1612 failrec
->last_mirror
++;
1614 spin_lock_irq(&BTRFS_I(inode
)->io_tree
.lock
);
1615 state
= find_first_extent_bit_state(&BTRFS_I(inode
)->io_tree
,
1618 if (state
&& state
->start
!= failrec
->start
)
1620 spin_unlock_irq(&BTRFS_I(inode
)->io_tree
.lock
);
1622 if (!state
|| failrec
->last_mirror
> num_copies
) {
1623 set_state_private(failure_tree
, failrec
->start
, 0);
1624 clear_extent_bits(failure_tree
, failrec
->start
,
1625 failrec
->start
+ failrec
->len
- 1,
1626 EXTENT_LOCKED
| EXTENT_DIRTY
, GFP_NOFS
);
1630 bio
= bio_alloc(GFP_NOFS
, 1);
1631 bio
->bi_private
= state
;
1632 bio
->bi_end_io
= failed_bio
->bi_end_io
;
1633 bio
->bi_sector
= failrec
->logical
>> 9;
1634 bio
->bi_bdev
= failed_bio
->bi_bdev
;
1636 bio_add_page(bio
, page
, failrec
->len
, start
- page_offset(page
));
1637 if (failed_bio
->bi_rw
& (1 << BIO_RW
))
1642 BTRFS_I(inode
)->io_tree
.ops
->submit_bio_hook(inode
, rw
, bio
,
1643 failrec
->last_mirror
,
1649 * each time an IO finishes, we do a fast check in the IO failure tree
1650 * to see if we need to process or clean up an io_failure_record
1652 int btrfs_clean_io_failures(struct inode
*inode
, u64 start
)
1655 u64 private_failure
;
1656 struct io_failure_record
*failure
;
1660 if (count_range_bits(&BTRFS_I(inode
)->io_failure_tree
, &private,
1661 (u64
)-1, 1, EXTENT_DIRTY
)) {
1662 ret
= get_state_private(&BTRFS_I(inode
)->io_failure_tree
,
1663 start
, &private_failure
);
1665 failure
= (struct io_failure_record
*)(unsigned long)
1667 set_state_private(&BTRFS_I(inode
)->io_failure_tree
,
1669 clear_extent_bits(&BTRFS_I(inode
)->io_failure_tree
,
1671 failure
->start
+ failure
->len
- 1,
1672 EXTENT_DIRTY
| EXTENT_LOCKED
,
1681 * when reads are done, we need to check csums to verify the data is correct
1682 * if there's a match, we allow the bio to finish. If not, we go through
1683 * the io_failure_record routines to find good copies
1685 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
,
1686 struct extent_state
*state
)
1688 size_t offset
= start
- ((u64
)page
->index
<< PAGE_CACHE_SHIFT
);
1689 struct inode
*inode
= page
->mapping
->host
;
1690 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1692 u64
private = ~(u32
)0;
1694 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1696 unsigned long flags
;
1698 if (btrfs_test_opt(root
, NODATASUM
) ||
1699 btrfs_test_flag(inode
, NODATASUM
))
1701 if (state
&& state
->start
== start
) {
1702 private = state
->private;
1705 ret
= get_state_private(io_tree
, start
, &private);
1707 local_irq_save(flags
);
1708 kaddr
= kmap_atomic(page
, KM_IRQ0
);
1712 csum
= btrfs_csum_data(root
, kaddr
+ offset
, csum
, end
- start
+ 1);
1713 btrfs_csum_final(csum
, (char *)&csum
);
1714 if (csum
!= private) {
1717 kunmap_atomic(kaddr
, KM_IRQ0
);
1718 local_irq_restore(flags
);
1720 /* if the io failure tree for this inode is non-empty,
1721 * check to see if we've recovered from a failed IO
1723 btrfs_clean_io_failures(inode
, start
);
1727 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
1728 page
->mapping
->host
->i_ino
, (unsigned long long)start
, csum
,
1730 memset(kaddr
+ offset
, 1, end
- start
+ 1);
1731 flush_dcache_page(page
);
1732 kunmap_atomic(kaddr
, KM_IRQ0
);
1733 local_irq_restore(flags
);
1740 * This creates an orphan entry for the given inode in case something goes
1741 * wrong in the middle of an unlink/truncate.
1743 int btrfs_orphan_add(struct btrfs_trans_handle
*trans
, struct inode
*inode
)
1745 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1748 spin_lock(&root
->list_lock
);
1750 /* already on the orphan list, we're good */
1751 if (!list_empty(&BTRFS_I(inode
)->i_orphan
)) {
1752 spin_unlock(&root
->list_lock
);
1756 list_add(&BTRFS_I(inode
)->i_orphan
, &root
->orphan_list
);
1758 spin_unlock(&root
->list_lock
);
1761 * insert an orphan item to track this unlinked/truncated file
1763 ret
= btrfs_insert_orphan_item(trans
, root
, inode
->i_ino
);
1769 * We have done the truncate/delete so we can go ahead and remove the orphan
1770 * item for this particular inode.
1772 int btrfs_orphan_del(struct btrfs_trans_handle
*trans
, struct inode
*inode
)
1774 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1777 spin_lock(&root
->list_lock
);
1779 if (list_empty(&BTRFS_I(inode
)->i_orphan
)) {
1780 spin_unlock(&root
->list_lock
);
1784 list_del_init(&BTRFS_I(inode
)->i_orphan
);
1786 spin_unlock(&root
->list_lock
);
1790 spin_unlock(&root
->list_lock
);
1792 ret
= btrfs_del_orphan_item(trans
, root
, inode
->i_ino
);
1798 * this cleans up any orphans that may be left on the list from the last use
1801 void btrfs_orphan_cleanup(struct btrfs_root
*root
)
1803 struct btrfs_path
*path
;
1804 struct extent_buffer
*leaf
;
1805 struct btrfs_item
*item
;
1806 struct btrfs_key key
, found_key
;
1807 struct btrfs_trans_handle
*trans
;
1808 struct inode
*inode
;
1809 int ret
= 0, nr_unlink
= 0, nr_truncate
= 0;
1811 path
= btrfs_alloc_path();
1816 key
.objectid
= BTRFS_ORPHAN_OBJECTID
;
1817 btrfs_set_key_type(&key
, BTRFS_ORPHAN_ITEM_KEY
);
1818 key
.offset
= (u64
)-1;
1822 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1824 printk(KERN_ERR
"Error searching slot for orphan: %d"
1830 * if ret == 0 means we found what we were searching for, which
1831 * is weird, but possible, so only screw with path if we didnt
1832 * find the key and see if we have stuff that matches
1835 if (path
->slots
[0] == 0)
1840 /* pull out the item */
1841 leaf
= path
->nodes
[0];
1842 item
= btrfs_item_nr(leaf
, path
->slots
[0]);
1843 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1845 /* make sure the item matches what we want */
1846 if (found_key
.objectid
!= BTRFS_ORPHAN_OBJECTID
)
1848 if (btrfs_key_type(&found_key
) != BTRFS_ORPHAN_ITEM_KEY
)
1851 /* release the path since we're done with it */
1852 btrfs_release_path(root
, path
);
1855 * this is where we are basically btrfs_lookup, without the
1856 * crossing root thing. we store the inode number in the
1857 * offset of the orphan item.
1859 inode
= btrfs_iget_locked(root
->fs_info
->sb
,
1860 found_key
.offset
, root
);
1864 if (inode
->i_state
& I_NEW
) {
1865 BTRFS_I(inode
)->root
= root
;
1867 /* have to set the location manually */
1868 BTRFS_I(inode
)->location
.objectid
= inode
->i_ino
;
1869 BTRFS_I(inode
)->location
.type
= BTRFS_INODE_ITEM_KEY
;
1870 BTRFS_I(inode
)->location
.offset
= 0;
1872 btrfs_read_locked_inode(inode
);
1873 unlock_new_inode(inode
);
1877 * add this inode to the orphan list so btrfs_orphan_del does
1878 * the proper thing when we hit it
1880 spin_lock(&root
->list_lock
);
1881 list_add(&BTRFS_I(inode
)->i_orphan
, &root
->orphan_list
);
1882 spin_unlock(&root
->list_lock
);
1885 * if this is a bad inode, means we actually succeeded in
1886 * removing the inode, but not the orphan record, which means
1887 * we need to manually delete the orphan since iput will just
1888 * do a destroy_inode
1890 if (is_bad_inode(inode
)) {
1891 trans
= btrfs_start_transaction(root
, 1);
1892 btrfs_orphan_del(trans
, inode
);
1893 btrfs_end_transaction(trans
, root
);
1898 /* if we have links, this was a truncate, lets do that */
1899 if (inode
->i_nlink
) {
1901 btrfs_truncate(inode
);
1906 /* this will do delete_inode and everything for us */
1911 printk(KERN_INFO
"btrfs: unlinked %d orphans\n", nr_unlink
);
1913 printk(KERN_INFO
"btrfs: truncated %d orphans\n", nr_truncate
);
1915 btrfs_free_path(path
);
1919 * read an inode from the btree into the in-memory inode
1921 void btrfs_read_locked_inode(struct inode
*inode
)
1923 struct btrfs_path
*path
;
1924 struct extent_buffer
*leaf
;
1925 struct btrfs_inode_item
*inode_item
;
1926 struct btrfs_timespec
*tspec
;
1927 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1928 struct btrfs_key location
;
1929 u64 alloc_group_block
;
1933 path
= btrfs_alloc_path();
1935 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
1937 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
1941 leaf
= path
->nodes
[0];
1942 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1943 struct btrfs_inode_item
);
1945 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
1946 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
1947 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
1948 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
1949 btrfs_i_size_write(inode
, btrfs_inode_size(leaf
, inode_item
));
1951 tspec
= btrfs_inode_atime(inode_item
);
1952 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
1953 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
1955 tspec
= btrfs_inode_mtime(inode_item
);
1956 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
1957 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
1959 tspec
= btrfs_inode_ctime(inode_item
);
1960 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
1961 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
1963 inode_set_bytes(inode
, btrfs_inode_nbytes(leaf
, inode_item
));
1964 BTRFS_I(inode
)->generation
= btrfs_inode_generation(leaf
, inode_item
);
1965 inode
->i_generation
= BTRFS_I(inode
)->generation
;
1967 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
1969 BTRFS_I(inode
)->index_cnt
= (u64
)-1;
1971 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
1972 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
1974 BTRFS_I(inode
)->flags
= btrfs_inode_flags(leaf
, inode_item
);
1975 if (!BTRFS_I(inode
)->block_group
) {
1976 BTRFS_I(inode
)->block_group
= btrfs_find_block_group(root
,
1978 BTRFS_BLOCK_GROUP_METADATA
, 0);
1980 btrfs_free_path(path
);
1983 switch (inode
->i_mode
& S_IFMT
) {
1985 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1986 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
1987 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
1988 inode
->i_fop
= &btrfs_file_operations
;
1989 inode
->i_op
= &btrfs_file_inode_operations
;
1992 inode
->i_fop
= &btrfs_dir_file_operations
;
1993 if (root
== root
->fs_info
->tree_root
)
1994 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
1996 inode
->i_op
= &btrfs_dir_inode_operations
;
1999 inode
->i_op
= &btrfs_symlink_inode_operations
;
2000 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2001 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
2004 init_special_inode(inode
, inode
->i_mode
, rdev
);
2010 btrfs_free_path(path
);
2011 make_bad_inode(inode
);
2015 * given a leaf and an inode, copy the inode fields into the leaf
2017 static void fill_inode_item(struct btrfs_trans_handle
*trans
,
2018 struct extent_buffer
*leaf
,
2019 struct btrfs_inode_item
*item
,
2020 struct inode
*inode
)
2022 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
2023 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
2024 btrfs_set_inode_size(leaf
, item
, BTRFS_I(inode
)->disk_i_size
);
2025 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
2026 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
2028 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
2029 inode
->i_atime
.tv_sec
);
2030 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
2031 inode
->i_atime
.tv_nsec
);
2033 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
2034 inode
->i_mtime
.tv_sec
);
2035 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
2036 inode
->i_mtime
.tv_nsec
);
2038 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
2039 inode
->i_ctime
.tv_sec
);
2040 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
2041 inode
->i_ctime
.tv_nsec
);
2043 btrfs_set_inode_nbytes(leaf
, item
, inode_get_bytes(inode
));
2044 btrfs_set_inode_generation(leaf
, item
, BTRFS_I(inode
)->generation
);
2045 btrfs_set_inode_transid(leaf
, item
, trans
->transid
);
2046 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
2047 btrfs_set_inode_flags(leaf
, item
, BTRFS_I(inode
)->flags
);
2048 btrfs_set_inode_block_group(leaf
, item
,
2049 BTRFS_I(inode
)->block_group
->key
.objectid
);
2053 * copy everything in the in-memory inode into the btree.
2055 int noinline
btrfs_update_inode(struct btrfs_trans_handle
*trans
,
2056 struct btrfs_root
*root
,
2057 struct inode
*inode
)
2059 struct btrfs_inode_item
*inode_item
;
2060 struct btrfs_path
*path
;
2061 struct extent_buffer
*leaf
;
2064 path
= btrfs_alloc_path();
2066 ret
= btrfs_lookup_inode(trans
, root
, path
,
2067 &BTRFS_I(inode
)->location
, 1);
2074 leaf
= path
->nodes
[0];
2075 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2076 struct btrfs_inode_item
);
2078 fill_inode_item(trans
, leaf
, inode_item
, inode
);
2079 btrfs_mark_buffer_dirty(leaf
);
2080 btrfs_set_inode_last_trans(trans
, inode
);
2083 btrfs_free_path(path
);
2089 * unlink helper that gets used here in inode.c and in the tree logging
2090 * recovery code. It remove a link in a directory with a given name, and
2091 * also drops the back refs in the inode to the directory
2093 int btrfs_unlink_inode(struct btrfs_trans_handle
*trans
,
2094 struct btrfs_root
*root
,
2095 struct inode
*dir
, struct inode
*inode
,
2096 const char *name
, int name_len
)
2098 struct btrfs_path
*path
;
2100 struct extent_buffer
*leaf
;
2101 struct btrfs_dir_item
*di
;
2102 struct btrfs_key key
;
2105 path
= btrfs_alloc_path();
2111 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
2112 name
, name_len
, -1);
2121 leaf
= path
->nodes
[0];
2122 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
2123 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
2126 btrfs_release_path(root
, path
);
2128 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
2130 dir
->i_ino
, &index
);
2132 printk("failed to delete reference to %.*s, "
2133 "inode %lu parent %lu\n", name_len
, name
,
2134 inode
->i_ino
, dir
->i_ino
);
2138 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
2139 index
, name
, name_len
, -1);
2148 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
2149 btrfs_release_path(root
, path
);
2151 ret
= btrfs_del_inode_ref_in_log(trans
, root
, name
, name_len
,
2153 BUG_ON(ret
!= 0 && ret
!= -ENOENT
);
2155 BTRFS_I(dir
)->log_dirty_trans
= trans
->transid
;
2157 ret
= btrfs_del_dir_entries_in_log(trans
, root
, name
, name_len
,
2161 btrfs_free_path(path
);
2165 btrfs_i_size_write(dir
, dir
->i_size
- name_len
* 2);
2166 inode
->i_ctime
= dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
2167 btrfs_update_inode(trans
, root
, dir
);
2168 btrfs_drop_nlink(inode
);
2169 ret
= btrfs_update_inode(trans
, root
, inode
);
2170 dir
->i_sb
->s_dirt
= 1;
2175 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
2177 struct btrfs_root
*root
;
2178 struct btrfs_trans_handle
*trans
;
2179 struct inode
*inode
= dentry
->d_inode
;
2181 unsigned long nr
= 0;
2183 root
= BTRFS_I(dir
)->root
;
2185 ret
= btrfs_check_free_space(root
, 1, 1);
2189 trans
= btrfs_start_transaction(root
, 1);
2191 btrfs_set_trans_block_group(trans
, dir
);
2192 ret
= btrfs_unlink_inode(trans
, root
, dir
, dentry
->d_inode
,
2193 dentry
->d_name
.name
, dentry
->d_name
.len
);
2195 if (inode
->i_nlink
== 0)
2196 ret
= btrfs_orphan_add(trans
, inode
);
2198 nr
= trans
->blocks_used
;
2200 btrfs_end_transaction_throttle(trans
, root
);
2202 btrfs_btree_balance_dirty(root
, nr
);
2206 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
2208 struct inode
*inode
= dentry
->d_inode
;
2211 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2212 struct btrfs_trans_handle
*trans
;
2213 unsigned long nr
= 0;
2216 * the FIRST_FREE_OBJECTID check makes sure we don't try to rmdir
2217 * the root of a subvolume or snapshot
2219 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
||
2220 inode
->i_ino
== BTRFS_FIRST_FREE_OBJECTID
) {
2224 ret
= btrfs_check_free_space(root
, 1, 1);
2228 trans
= btrfs_start_transaction(root
, 1);
2229 btrfs_set_trans_block_group(trans
, dir
);
2231 err
= btrfs_orphan_add(trans
, inode
);
2235 /* now the directory is empty */
2236 err
= btrfs_unlink_inode(trans
, root
, dir
, dentry
->d_inode
,
2237 dentry
->d_name
.name
, dentry
->d_name
.len
);
2239 btrfs_i_size_write(inode
, 0);
2243 nr
= trans
->blocks_used
;
2244 ret
= btrfs_end_transaction_throttle(trans
, root
);
2246 btrfs_btree_balance_dirty(root
, nr
);
2254 * when truncating bytes in a file, it is possible to avoid reading
2255 * the leaves that contain only checksum items. This can be the
2256 * majority of the IO required to delete a large file, but it must
2257 * be done carefully.
2259 * The keys in the level just above the leaves are checked to make sure
2260 * the lowest key in a given leaf is a csum key, and starts at an offset
2261 * after the new size.
2263 * Then the key for the next leaf is checked to make sure it also has
2264 * a checksum item for the same file. If it does, we know our target leaf
2265 * contains only checksum items, and it can be safely freed without reading
2268 * This is just an optimization targeted at large files. It may do
2269 * nothing. It will return 0 unless things went badly.
2271 static noinline
int drop_csum_leaves(struct btrfs_trans_handle
*trans
,
2272 struct btrfs_root
*root
,
2273 struct btrfs_path
*path
,
2274 struct inode
*inode
, u64 new_size
)
2276 struct btrfs_key key
;
2279 struct btrfs_key found_key
;
2280 struct btrfs_key other_key
;
2281 struct btrfs_leaf_ref
*ref
;
2285 path
->lowest_level
= 1;
2286 key
.objectid
= inode
->i_ino
;
2287 key
.type
= BTRFS_CSUM_ITEM_KEY
;
2288 key
.offset
= new_size
;
2290 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
2294 if (path
->nodes
[1] == NULL
) {
2299 btrfs_node_key_to_cpu(path
->nodes
[1], &found_key
, path
->slots
[1]);
2300 nritems
= btrfs_header_nritems(path
->nodes
[1]);
2305 if (path
->slots
[1] >= nritems
)
2308 /* did we find a key greater than anything we want to delete? */
2309 if (found_key
.objectid
> inode
->i_ino
||
2310 (found_key
.objectid
== inode
->i_ino
&& found_key
.type
> key
.type
))
2313 /* we check the next key in the node to make sure the leave contains
2314 * only checksum items. This comparison doesn't work if our
2315 * leaf is the last one in the node
2317 if (path
->slots
[1] + 1 >= nritems
) {
2319 /* search forward from the last key in the node, this
2320 * will bring us into the next node in the tree
2322 btrfs_node_key_to_cpu(path
->nodes
[1], &found_key
, nritems
- 1);
2324 /* unlikely, but we inc below, so check to be safe */
2325 if (found_key
.offset
== (u64
)-1)
2328 /* search_forward needs a path with locks held, do the
2329 * search again for the original key. It is possible
2330 * this will race with a balance and return a path that
2331 * we could modify, but this drop is just an optimization
2332 * and is allowed to miss some leaves.
2334 btrfs_release_path(root
, path
);
2337 /* setup a max key for search_forward */
2338 other_key
.offset
= (u64
)-1;
2339 other_key
.type
= key
.type
;
2340 other_key
.objectid
= key
.objectid
;
2342 path
->keep_locks
= 1;
2343 ret
= btrfs_search_forward(root
, &found_key
, &other_key
,
2345 path
->keep_locks
= 0;
2346 if (ret
|| found_key
.objectid
!= key
.objectid
||
2347 found_key
.type
!= key
.type
) {
2352 key
.offset
= found_key
.offset
;
2353 btrfs_release_path(root
, path
);
2358 /* we know there's one more slot after us in the tree,
2359 * read that key so we can verify it is also a checksum item
2361 btrfs_node_key_to_cpu(path
->nodes
[1], &other_key
, path
->slots
[1] + 1);
2363 if (found_key
.objectid
< inode
->i_ino
)
2366 if (found_key
.type
!= key
.type
|| found_key
.offset
< new_size
)
2370 * if the key for the next leaf isn't a csum key from this objectid,
2371 * we can't be sure there aren't good items inside this leaf.
2374 if (other_key
.objectid
!= inode
->i_ino
|| other_key
.type
!= key
.type
)
2377 leaf_start
= btrfs_node_blockptr(path
->nodes
[1], path
->slots
[1]);
2378 leaf_gen
= btrfs_node_ptr_generation(path
->nodes
[1], path
->slots
[1]);
2380 * it is safe to delete this leaf, it contains only
2381 * csum items from this inode at an offset >= new_size
2383 ret
= btrfs_del_leaf(trans
, root
, path
, leaf_start
);
2386 if (root
->ref_cows
&& leaf_gen
< trans
->transid
) {
2387 ref
= btrfs_alloc_leaf_ref(root
, 0);
2389 ref
->root_gen
= root
->root_key
.offset
;
2390 ref
->bytenr
= leaf_start
;
2392 ref
->generation
= leaf_gen
;
2395 ret
= btrfs_add_leaf_ref(root
, ref
, 0);
2397 btrfs_free_leaf_ref(root
, ref
);
2403 btrfs_release_path(root
, path
);
2405 if (other_key
.objectid
== inode
->i_ino
&&
2406 other_key
.type
== key
.type
&& other_key
.offset
> key
.offset
) {
2407 key
.offset
= other_key
.offset
;
2413 /* fixup any changes we've made to the path */
2414 path
->lowest_level
= 0;
2415 path
->keep_locks
= 0;
2416 btrfs_release_path(root
, path
);
2421 * this can truncate away extent items, csum items and directory items.
2422 * It starts at a high offset and removes keys until it can't find
2423 * any higher than new_size
2425 * csum items that cross the new i_size are truncated to the new size
2428 * min_type is the minimum key type to truncate down to. If set to 0, this
2429 * will kill all the items on this inode, including the INODE_ITEM_KEY.
2431 noinline
int btrfs_truncate_inode_items(struct btrfs_trans_handle
*trans
,
2432 struct btrfs_root
*root
,
2433 struct inode
*inode
,
2434 u64 new_size
, u32 min_type
)
2437 struct btrfs_path
*path
;
2438 struct btrfs_key key
;
2439 struct btrfs_key found_key
;
2441 struct extent_buffer
*leaf
;
2442 struct btrfs_file_extent_item
*fi
;
2443 u64 extent_start
= 0;
2444 u64 extent_num_bytes
= 0;
2450 int pending_del_nr
= 0;
2451 int pending_del_slot
= 0;
2452 int extent_type
= -1;
2454 u64 mask
= root
->sectorsize
- 1;
2457 btrfs_drop_extent_cache(inode
, new_size
& (~mask
), (u64
)-1, 0);
2458 path
= btrfs_alloc_path();
2462 /* FIXME, add redo link to tree so we don't leak on crash */
2463 key
.objectid
= inode
->i_ino
;
2464 key
.offset
= (u64
)-1;
2467 btrfs_init_path(path
);
2469 ret
= drop_csum_leaves(trans
, root
, path
, inode
, new_size
);
2473 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
2478 /* there are no items in the tree for us to truncate, we're
2481 if (path
->slots
[0] == 0) {
2490 leaf
= path
->nodes
[0];
2491 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
2492 found_type
= btrfs_key_type(&found_key
);
2495 if (found_key
.objectid
!= inode
->i_ino
)
2498 if (found_type
< min_type
)
2501 item_end
= found_key
.offset
;
2502 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
2503 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
2504 struct btrfs_file_extent_item
);
2505 extent_type
= btrfs_file_extent_type(leaf
, fi
);
2506 encoding
= btrfs_file_extent_compression(leaf
, fi
);
2507 encoding
|= btrfs_file_extent_encryption(leaf
, fi
);
2508 encoding
|= btrfs_file_extent_other_encoding(leaf
, fi
);
2510 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
2512 btrfs_file_extent_num_bytes(leaf
, fi
);
2513 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
2514 item_end
+= btrfs_file_extent_inline_len(leaf
,
2519 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
2520 ret
= btrfs_csum_truncate(trans
, root
, path
,
2524 if (item_end
< new_size
) {
2525 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
2526 found_type
= BTRFS_INODE_ITEM_KEY
;
2527 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
2528 found_type
= BTRFS_CSUM_ITEM_KEY
;
2529 } else if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
2530 found_type
= BTRFS_XATTR_ITEM_KEY
;
2531 } else if (found_type
== BTRFS_XATTR_ITEM_KEY
) {
2532 found_type
= BTRFS_INODE_REF_KEY
;
2533 } else if (found_type
) {
2538 btrfs_set_key_type(&key
, found_type
);
2541 if (found_key
.offset
>= new_size
)
2547 /* FIXME, shrink the extent if the ref count is only 1 */
2548 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
2551 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
2553 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
2554 if (!del_item
&& !encoding
) {
2555 u64 orig_num_bytes
=
2556 btrfs_file_extent_num_bytes(leaf
, fi
);
2557 extent_num_bytes
= new_size
-
2558 found_key
.offset
+ root
->sectorsize
- 1;
2559 extent_num_bytes
= extent_num_bytes
&
2560 ~((u64
)root
->sectorsize
- 1);
2561 btrfs_set_file_extent_num_bytes(leaf
, fi
,
2563 num_dec
= (orig_num_bytes
-
2565 if (root
->ref_cows
&& extent_start
!= 0)
2566 inode_sub_bytes(inode
, num_dec
);
2567 btrfs_mark_buffer_dirty(leaf
);
2570 btrfs_file_extent_disk_num_bytes(leaf
,
2572 /* FIXME blocksize != 4096 */
2573 num_dec
= btrfs_file_extent_num_bytes(leaf
, fi
);
2574 if (extent_start
!= 0) {
2577 inode_sub_bytes(inode
, num_dec
);
2579 root_gen
= btrfs_header_generation(leaf
);
2580 root_owner
= btrfs_header_owner(leaf
);
2582 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
2584 * we can't truncate inline items that have had
2588 btrfs_file_extent_compression(leaf
, fi
) == 0 &&
2589 btrfs_file_extent_encryption(leaf
, fi
) == 0 &&
2590 btrfs_file_extent_other_encoding(leaf
, fi
) == 0) {
2591 u32 size
= new_size
- found_key
.offset
;
2593 if (root
->ref_cows
) {
2594 inode_sub_bytes(inode
, item_end
+ 1 -
2598 btrfs_file_extent_calc_inline_size(size
);
2599 ret
= btrfs_truncate_item(trans
, root
, path
,
2602 } else if (root
->ref_cows
) {
2603 inode_sub_bytes(inode
, item_end
+ 1 -
2609 if (!pending_del_nr
) {
2610 /* no pending yet, add ourselves */
2611 pending_del_slot
= path
->slots
[0];
2613 } else if (pending_del_nr
&&
2614 path
->slots
[0] + 1 == pending_del_slot
) {
2615 /* hop on the pending chunk */
2617 pending_del_slot
= path
->slots
[0];
2619 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path
->slots
[0], pending_del_nr
, pending_del_slot
);
2625 ret
= btrfs_free_extent(trans
, root
, extent_start
,
2627 leaf
->start
, root_owner
,
2628 root_gen
, inode
->i_ino
, 0);
2632 if (path
->slots
[0] == 0) {
2635 btrfs_release_path(root
, path
);
2640 if (pending_del_nr
&&
2641 path
->slots
[0] + 1 != pending_del_slot
) {
2642 struct btrfs_key debug
;
2644 btrfs_item_key_to_cpu(path
->nodes
[0], &debug
,
2646 ret
= btrfs_del_items(trans
, root
, path
,
2651 btrfs_release_path(root
, path
);
2657 if (pending_del_nr
) {
2658 ret
= btrfs_del_items(trans
, root
, path
, pending_del_slot
,
2661 btrfs_free_path(path
);
2662 inode
->i_sb
->s_dirt
= 1;
2667 * taken from block_truncate_page, but does cow as it zeros out
2668 * any bytes left in the last page in the file.
2670 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
2672 struct inode
*inode
= mapping
->host
;
2673 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2674 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2675 struct btrfs_ordered_extent
*ordered
;
2677 u32 blocksize
= root
->sectorsize
;
2678 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
2679 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
2685 if ((offset
& (blocksize
- 1)) == 0)
2690 page
= grab_cache_page(mapping
, index
);
2694 page_start
= page_offset(page
);
2695 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2697 if (!PageUptodate(page
)) {
2698 ret
= btrfs_readpage(NULL
, page
);
2700 if (page
->mapping
!= mapping
) {
2702 page_cache_release(page
);
2705 if (!PageUptodate(page
)) {
2710 wait_on_page_writeback(page
);
2712 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2713 set_page_extent_mapped(page
);
2715 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
2717 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2719 page_cache_release(page
);
2720 btrfs_start_ordered_extent(inode
, ordered
, 1);
2721 btrfs_put_ordered_extent(ordered
);
2725 btrfs_set_extent_delalloc(inode
, page_start
, page_end
);
2727 if (offset
!= PAGE_CACHE_SIZE
) {
2729 memset(kaddr
+ offset
, 0, PAGE_CACHE_SIZE
- offset
);
2730 flush_dcache_page(page
);
2733 ClearPageChecked(page
);
2734 set_page_dirty(page
);
2735 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2739 page_cache_release(page
);
2744 int btrfs_cont_expand(struct inode
*inode
, loff_t size
)
2746 struct btrfs_trans_handle
*trans
;
2747 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2748 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2749 struct extent_map
*em
;
2750 u64 mask
= root
->sectorsize
- 1;
2751 u64 hole_start
= (inode
->i_size
+ mask
) & ~mask
;
2752 u64 block_end
= (size
+ mask
) & ~mask
;
2758 if (size
<= hole_start
)
2761 err
= btrfs_check_free_space(root
, 1, 0);
2765 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
2768 struct btrfs_ordered_extent
*ordered
;
2769 btrfs_wait_ordered_range(inode
, hole_start
,
2770 block_end
- hole_start
);
2771 lock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
2772 ordered
= btrfs_lookup_ordered_extent(inode
, hole_start
);
2775 unlock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
2776 btrfs_put_ordered_extent(ordered
);
2779 trans
= btrfs_start_transaction(root
, 1);
2780 btrfs_set_trans_block_group(trans
, inode
);
2782 cur_offset
= hole_start
;
2784 em
= btrfs_get_extent(inode
, NULL
, 0, cur_offset
,
2785 block_end
- cur_offset
, 0);
2786 BUG_ON(IS_ERR(em
) || !em
);
2787 last_byte
= min(extent_map_end(em
), block_end
);
2788 last_byte
= (last_byte
+ mask
) & ~mask
;
2789 if (test_bit(EXTENT_FLAG_VACANCY
, &em
->flags
)) {
2791 hole_size
= last_byte
- cur_offset
;
2792 err
= btrfs_drop_extents(trans
, root
, inode
,
2794 cur_offset
+ hole_size
,
2795 cur_offset
, &hint_byte
);
2798 err
= btrfs_insert_file_extent(trans
, root
,
2799 inode
->i_ino
, cur_offset
, 0,
2800 0, hole_size
, 0, hole_size
,
2802 btrfs_drop_extent_cache(inode
, hole_start
,
2805 free_extent_map(em
);
2806 cur_offset
= last_byte
;
2807 if (err
|| cur_offset
>= block_end
)
2811 btrfs_end_transaction(trans
, root
);
2812 unlock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
2816 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
2818 struct inode
*inode
= dentry
->d_inode
;
2821 err
= inode_change_ok(inode
, attr
);
2825 if (S_ISREG(inode
->i_mode
) &&
2826 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
2827 err
= btrfs_cont_expand(inode
, attr
->ia_size
);
2832 err
= inode_setattr(inode
, attr
);
2834 if (!err
&& ((attr
->ia_valid
& ATTR_MODE
)))
2835 err
= btrfs_acl_chmod(inode
);
2839 void btrfs_delete_inode(struct inode
*inode
)
2841 struct btrfs_trans_handle
*trans
;
2842 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2846 truncate_inode_pages(&inode
->i_data
, 0);
2847 if (is_bad_inode(inode
)) {
2848 btrfs_orphan_del(NULL
, inode
);
2851 btrfs_wait_ordered_range(inode
, 0, (u64
)-1);
2853 btrfs_i_size_write(inode
, 0);
2854 trans
= btrfs_start_transaction(root
, 1);
2856 btrfs_set_trans_block_group(trans
, inode
);
2857 ret
= btrfs_truncate_inode_items(trans
, root
, inode
, inode
->i_size
, 0);
2859 btrfs_orphan_del(NULL
, inode
);
2860 goto no_delete_lock
;
2863 btrfs_orphan_del(trans
, inode
);
2865 nr
= trans
->blocks_used
;
2868 btrfs_end_transaction(trans
, root
);
2869 btrfs_btree_balance_dirty(root
, nr
);
2873 nr
= trans
->blocks_used
;
2874 btrfs_end_transaction(trans
, root
);
2875 btrfs_btree_balance_dirty(root
, nr
);
2881 * this returns the key found in the dir entry in the location pointer.
2882 * If no dir entries were found, location->objectid is 0.
2884 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
2885 struct btrfs_key
*location
)
2887 const char *name
= dentry
->d_name
.name
;
2888 int namelen
= dentry
->d_name
.len
;
2889 struct btrfs_dir_item
*di
;
2890 struct btrfs_path
*path
;
2891 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2894 path
= btrfs_alloc_path();
2897 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
2901 if (!di
|| IS_ERR(di
)) {
2904 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
2906 btrfs_free_path(path
);
2909 location
->objectid
= 0;
2914 * when we hit a tree root in a directory, the btrfs part of the inode
2915 * needs to be changed to reflect the root directory of the tree root. This
2916 * is kind of like crossing a mount point.
2918 static int fixup_tree_root_location(struct btrfs_root
*root
,
2919 struct btrfs_key
*location
,
2920 struct btrfs_root
**sub_root
,
2921 struct dentry
*dentry
)
2923 struct btrfs_root_item
*ri
;
2925 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
2927 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
2930 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
2931 dentry
->d_name
.name
,
2932 dentry
->d_name
.len
);
2933 if (IS_ERR(*sub_root
))
2934 return PTR_ERR(*sub_root
);
2936 ri
= &(*sub_root
)->root_item
;
2937 location
->objectid
= btrfs_root_dirid(ri
);
2938 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
2939 location
->offset
= 0;
2944 static noinline
void init_btrfs_i(struct inode
*inode
)
2946 struct btrfs_inode
*bi
= BTRFS_I(inode
);
2949 bi
->i_default_acl
= NULL
;
2953 bi
->logged_trans
= 0;
2954 bi
->delalloc_bytes
= 0;
2955 bi
->disk_i_size
= 0;
2957 bi
->index_cnt
= (u64
)-1;
2958 bi
->log_dirty_trans
= 0;
2959 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
2960 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
2961 inode
->i_mapping
, GFP_NOFS
);
2962 extent_io_tree_init(&BTRFS_I(inode
)->io_failure_tree
,
2963 inode
->i_mapping
, GFP_NOFS
);
2964 INIT_LIST_HEAD(&BTRFS_I(inode
)->delalloc_inodes
);
2965 btrfs_ordered_inode_tree_init(&BTRFS_I(inode
)->ordered_tree
);
2966 mutex_init(&BTRFS_I(inode
)->csum_mutex
);
2967 mutex_init(&BTRFS_I(inode
)->extent_mutex
);
2968 mutex_init(&BTRFS_I(inode
)->log_mutex
);
2971 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
2973 struct btrfs_iget_args
*args
= p
;
2974 inode
->i_ino
= args
->ino
;
2975 init_btrfs_i(inode
);
2976 BTRFS_I(inode
)->root
= args
->root
;
2980 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
2982 struct btrfs_iget_args
*args
= opaque
;
2983 return (args
->ino
== inode
->i_ino
&&
2984 args
->root
== BTRFS_I(inode
)->root
);
2987 struct inode
*btrfs_ilookup(struct super_block
*s
, u64 objectid
,
2988 struct btrfs_root
*root
, int wait
)
2990 struct inode
*inode
;
2991 struct btrfs_iget_args args
;
2992 args
.ino
= objectid
;
2996 inode
= ilookup5(s
, objectid
, btrfs_find_actor
,
2999 inode
= ilookup5_nowait(s
, objectid
, btrfs_find_actor
,
3005 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
3006 struct btrfs_root
*root
)
3008 struct inode
*inode
;
3009 struct btrfs_iget_args args
;
3010 args
.ino
= objectid
;
3013 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
3014 btrfs_init_locked_inode
,
3019 /* Get an inode object given its location and corresponding root.
3020 * Returns in *is_new if the inode was read from disk
3022 struct inode
*btrfs_iget(struct super_block
*s
, struct btrfs_key
*location
,
3023 struct btrfs_root
*root
, int *is_new
)
3025 struct inode
*inode
;
3027 inode
= btrfs_iget_locked(s
, location
->objectid
, root
);
3029 return ERR_PTR(-EACCES
);
3031 if (inode
->i_state
& I_NEW
) {
3032 BTRFS_I(inode
)->root
= root
;
3033 memcpy(&BTRFS_I(inode
)->location
, location
, sizeof(*location
));
3034 btrfs_read_locked_inode(inode
);
3035 unlock_new_inode(inode
);
3046 struct inode
*btrfs_lookup_dentry(struct inode
*dir
, struct dentry
*dentry
)
3048 struct inode
* inode
;
3049 struct btrfs_inode
*bi
= BTRFS_I(dir
);
3050 struct btrfs_root
*root
= bi
->root
;
3051 struct btrfs_root
*sub_root
= root
;
3052 struct btrfs_key location
;
3055 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
3056 return ERR_PTR(-ENAMETOOLONG
);
3058 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
3061 return ERR_PTR(ret
);
3064 if (location
.objectid
) {
3065 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
3068 return ERR_PTR(ret
);
3070 return ERR_PTR(-ENOENT
);
3071 inode
= btrfs_iget(dir
->i_sb
, &location
, sub_root
, &new);
3073 return ERR_CAST(inode
);
3078 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
3079 struct nameidata
*nd
)
3081 struct inode
*inode
;
3083 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
3084 return ERR_PTR(-ENAMETOOLONG
);
3086 inode
= btrfs_lookup_dentry(dir
, dentry
);
3088 return ERR_CAST(inode
);
3090 return d_splice_alias(inode
, dentry
);
3093 static unsigned char btrfs_filetype_table
[] = {
3094 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
3097 static int btrfs_real_readdir(struct file
*filp
, void *dirent
,
3100 struct inode
*inode
= filp
->f_dentry
->d_inode
;
3101 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3102 struct btrfs_item
*item
;
3103 struct btrfs_dir_item
*di
;
3104 struct btrfs_key key
;
3105 struct btrfs_key found_key
;
3106 struct btrfs_path
*path
;
3109 struct extent_buffer
*leaf
;
3112 unsigned char d_type
;
3117 int key_type
= BTRFS_DIR_INDEX_KEY
;
3122 /* FIXME, use a real flag for deciding about the key type */
3123 if (root
->fs_info
->tree_root
== root
)
3124 key_type
= BTRFS_DIR_ITEM_KEY
;
3126 /* special case for "." */
3127 if (filp
->f_pos
== 0) {
3128 over
= filldir(dirent
, ".", 1,
3135 /* special case for .., just use the back ref */
3136 if (filp
->f_pos
== 1) {
3137 u64 pino
= parent_ino(filp
->f_path
.dentry
);
3138 over
= filldir(dirent
, "..", 2,
3144 path
= btrfs_alloc_path();
3147 btrfs_set_key_type(&key
, key_type
);
3148 key
.offset
= filp
->f_pos
;
3149 key
.objectid
= inode
->i_ino
;
3151 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3157 leaf
= path
->nodes
[0];
3158 nritems
= btrfs_header_nritems(leaf
);
3159 slot
= path
->slots
[0];
3160 if (advance
|| slot
>= nritems
) {
3161 if (slot
>= nritems
- 1) {
3162 ret
= btrfs_next_leaf(root
, path
);
3165 leaf
= path
->nodes
[0];
3166 nritems
= btrfs_header_nritems(leaf
);
3167 slot
= path
->slots
[0];
3175 item
= btrfs_item_nr(leaf
, slot
);
3176 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
3178 if (found_key
.objectid
!= key
.objectid
)
3180 if (btrfs_key_type(&found_key
) != key_type
)
3182 if (found_key
.offset
< filp
->f_pos
)
3185 filp
->f_pos
= found_key
.offset
;
3187 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
3189 di_total
= btrfs_item_size(leaf
, item
);
3191 while (di_cur
< di_total
) {
3192 struct btrfs_key location
;
3194 name_len
= btrfs_dir_name_len(leaf
, di
);
3195 if (name_len
<= sizeof(tmp_name
)) {
3196 name_ptr
= tmp_name
;
3198 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
3204 read_extent_buffer(leaf
, name_ptr
,
3205 (unsigned long)(di
+ 1), name_len
);
3207 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
3208 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
3210 /* is this a reference to our own snapshot? If so
3213 if (location
.type
== BTRFS_ROOT_ITEM_KEY
&&
3214 location
.objectid
== root
->root_key
.objectid
) {
3218 over
= filldir(dirent
, name_ptr
, name_len
,
3219 found_key
.offset
, location
.objectid
,
3223 if (name_ptr
!= tmp_name
)
3228 di_len
= btrfs_dir_name_len(leaf
, di
) +
3229 btrfs_dir_data_len(leaf
, di
) + sizeof(*di
);
3231 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
3235 /* Reached end of directory/root. Bump pos past the last item. */
3236 if (key_type
== BTRFS_DIR_INDEX_KEY
)
3237 filp
->f_pos
= INT_LIMIT(typeof(filp
->f_pos
));
3243 btrfs_free_path(path
);
3247 int btrfs_write_inode(struct inode
*inode
, int wait
)
3249 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3250 struct btrfs_trans_handle
*trans
;
3253 if (root
->fs_info
->btree_inode
== inode
)
3257 trans
= btrfs_join_transaction(root
, 1);
3258 btrfs_set_trans_block_group(trans
, inode
);
3259 ret
= btrfs_commit_transaction(trans
, root
);
3265 * This is somewhat expensive, updating the tree every time the
3266 * inode changes. But, it is most likely to find the inode in cache.
3267 * FIXME, needs more benchmarking...there are no reasons other than performance
3268 * to keep or drop this code.
3270 void btrfs_dirty_inode(struct inode
*inode
)
3272 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3273 struct btrfs_trans_handle
*trans
;
3275 trans
= btrfs_join_transaction(root
, 1);
3276 btrfs_set_trans_block_group(trans
, inode
);
3277 btrfs_update_inode(trans
, root
, inode
);
3278 btrfs_end_transaction(trans
, root
);
3282 * find the highest existing sequence number in a directory
3283 * and then set the in-memory index_cnt variable to reflect
3284 * free sequence numbers
3286 static int btrfs_set_inode_index_count(struct inode
*inode
)
3288 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3289 struct btrfs_key key
, found_key
;
3290 struct btrfs_path
*path
;
3291 struct extent_buffer
*leaf
;
3294 key
.objectid
= inode
->i_ino
;
3295 btrfs_set_key_type(&key
, BTRFS_DIR_INDEX_KEY
);
3296 key
.offset
= (u64
)-1;
3298 path
= btrfs_alloc_path();
3302 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3305 /* FIXME: we should be able to handle this */
3311 * MAGIC NUMBER EXPLANATION:
3312 * since we search a directory based on f_pos we have to start at 2
3313 * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody
3314 * else has to start at 2
3316 if (path
->slots
[0] == 0) {
3317 BTRFS_I(inode
)->index_cnt
= 2;
3323 leaf
= path
->nodes
[0];
3324 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3326 if (found_key
.objectid
!= inode
->i_ino
||
3327 btrfs_key_type(&found_key
) != BTRFS_DIR_INDEX_KEY
) {
3328 BTRFS_I(inode
)->index_cnt
= 2;
3332 BTRFS_I(inode
)->index_cnt
= found_key
.offset
+ 1;
3334 btrfs_free_path(path
);
3339 * helper to find a free sequence number in a given directory. This current
3340 * code is very simple, later versions will do smarter things in the btree
3342 int btrfs_set_inode_index(struct inode
*dir
, u64
*index
)
3346 if (BTRFS_I(dir
)->index_cnt
== (u64
)-1) {
3347 ret
= btrfs_set_inode_index_count(dir
);
3353 *index
= BTRFS_I(dir
)->index_cnt
;
3354 BTRFS_I(dir
)->index_cnt
++;
3359 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
3360 struct btrfs_root
*root
,
3362 const char *name
, int name_len
,
3365 struct btrfs_block_group_cache
*group
,
3366 int mode
, u64
*index
)
3368 struct inode
*inode
;
3369 struct btrfs_inode_item
*inode_item
;
3370 struct btrfs_block_group_cache
*new_inode_group
;
3371 struct btrfs_key
*location
;
3372 struct btrfs_path
*path
;
3373 struct btrfs_inode_ref
*ref
;
3374 struct btrfs_key key
[2];
3380 path
= btrfs_alloc_path();
3383 inode
= new_inode(root
->fs_info
->sb
);
3385 return ERR_PTR(-ENOMEM
);
3388 ret
= btrfs_set_inode_index(dir
, index
);
3390 return ERR_PTR(ret
);
3393 * index_cnt is ignored for everything but a dir,
3394 * btrfs_get_inode_index_count has an explanation for the magic
3397 init_btrfs_i(inode
);
3398 BTRFS_I(inode
)->index_cnt
= 2;
3399 BTRFS_I(inode
)->root
= root
;
3400 BTRFS_I(inode
)->generation
= trans
->transid
;
3406 new_inode_group
= btrfs_find_block_group(root
, group
, 0,
3407 BTRFS_BLOCK_GROUP_METADATA
, owner
);
3408 if (!new_inode_group
) {
3409 printk("find_block group failed\n");
3410 new_inode_group
= group
;
3412 BTRFS_I(inode
)->block_group
= new_inode_group
;
3414 key
[0].objectid
= objectid
;
3415 btrfs_set_key_type(&key
[0], BTRFS_INODE_ITEM_KEY
);
3418 key
[1].objectid
= objectid
;
3419 btrfs_set_key_type(&key
[1], BTRFS_INODE_REF_KEY
);
3420 key
[1].offset
= ref_objectid
;
3422 sizes
[0] = sizeof(struct btrfs_inode_item
);
3423 sizes
[1] = name_len
+ sizeof(*ref
);
3425 ret
= btrfs_insert_empty_items(trans
, root
, path
, key
, sizes
, 2);
3429 if (objectid
> root
->highest_inode
)
3430 root
->highest_inode
= objectid
;
3432 inode
->i_uid
= current
->fsuid
;
3433 inode
->i_gid
= current
->fsgid
;
3434 inode
->i_mode
= mode
;
3435 inode
->i_ino
= objectid
;
3436 inode_set_bytes(inode
, 0);
3437 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
3438 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
3439 struct btrfs_inode_item
);
3440 fill_inode_item(trans
, path
->nodes
[0], inode_item
, inode
);
3442 ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0] + 1,
3443 struct btrfs_inode_ref
);
3444 btrfs_set_inode_ref_name_len(path
->nodes
[0], ref
, name_len
);
3445 btrfs_set_inode_ref_index(path
->nodes
[0], ref
, *index
);
3446 ptr
= (unsigned long)(ref
+ 1);
3447 write_extent_buffer(path
->nodes
[0], name
, ptr
, name_len
);
3449 btrfs_mark_buffer_dirty(path
->nodes
[0]);
3450 btrfs_free_path(path
);
3452 location
= &BTRFS_I(inode
)->location
;
3453 location
->objectid
= objectid
;
3454 location
->offset
= 0;
3455 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
3457 insert_inode_hash(inode
);
3461 BTRFS_I(dir
)->index_cnt
--;
3462 btrfs_free_path(path
);
3463 return ERR_PTR(ret
);
3466 static inline u8
btrfs_inode_type(struct inode
*inode
)
3468 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
3472 * utility function to add 'inode' into 'parent_inode' with
3473 * a give name and a given sequence number.
3474 * if 'add_backref' is true, also insert a backref from the
3475 * inode to the parent directory.
3477 int btrfs_add_link(struct btrfs_trans_handle
*trans
,
3478 struct inode
*parent_inode
, struct inode
*inode
,
3479 const char *name
, int name_len
, int add_backref
, u64 index
)
3482 struct btrfs_key key
;
3483 struct btrfs_root
*root
= BTRFS_I(parent_inode
)->root
;
3485 key
.objectid
= inode
->i_ino
;
3486 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
3489 ret
= btrfs_insert_dir_item(trans
, root
, name
, name_len
,
3490 parent_inode
->i_ino
,
3491 &key
, btrfs_inode_type(inode
),
3495 ret
= btrfs_insert_inode_ref(trans
, root
,
3498 parent_inode
->i_ino
,
3501 btrfs_i_size_write(parent_inode
, parent_inode
->i_size
+
3503 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
3504 ret
= btrfs_update_inode(trans
, root
, parent_inode
);
3509 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
3510 struct dentry
*dentry
, struct inode
*inode
,
3511 int backref
, u64 index
)
3513 int err
= btrfs_add_link(trans
, dentry
->d_parent
->d_inode
,
3514 inode
, dentry
->d_name
.name
,
3515 dentry
->d_name
.len
, backref
, index
);
3517 d_instantiate(dentry
, inode
);
3525 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
3526 int mode
, dev_t rdev
)
3528 struct btrfs_trans_handle
*trans
;
3529 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3530 struct inode
*inode
= NULL
;
3534 unsigned long nr
= 0;
3537 if (!new_valid_dev(rdev
))
3540 err
= btrfs_check_free_space(root
, 1, 0);
3544 trans
= btrfs_start_transaction(root
, 1);
3545 btrfs_set_trans_block_group(trans
, dir
);
3547 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
3553 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
3555 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
3556 BTRFS_I(dir
)->block_group
, mode
, &index
);
3557 err
= PTR_ERR(inode
);
3561 err
= btrfs_init_acl(inode
, dir
);
3567 btrfs_set_trans_block_group(trans
, inode
);
3568 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0, index
);
3572 inode
->i_op
= &btrfs_special_inode_operations
;
3573 init_special_inode(inode
, inode
->i_mode
, rdev
);
3574 btrfs_update_inode(trans
, root
, inode
);
3576 dir
->i_sb
->s_dirt
= 1;
3577 btrfs_update_inode_block_group(trans
, inode
);
3578 btrfs_update_inode_block_group(trans
, dir
);
3580 nr
= trans
->blocks_used
;
3581 btrfs_end_transaction_throttle(trans
, root
);
3584 inode_dec_link_count(inode
);
3587 btrfs_btree_balance_dirty(root
, nr
);
3591 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
3592 int mode
, struct nameidata
*nd
)
3594 struct btrfs_trans_handle
*trans
;
3595 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3596 struct inode
*inode
= NULL
;
3599 unsigned long nr
= 0;
3603 err
= btrfs_check_free_space(root
, 1, 0);
3606 trans
= btrfs_start_transaction(root
, 1);
3607 btrfs_set_trans_block_group(trans
, dir
);
3609 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
3615 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
3617 dentry
->d_parent
->d_inode
->i_ino
,
3618 objectid
, BTRFS_I(dir
)->block_group
, mode
,
3620 err
= PTR_ERR(inode
);
3624 err
= btrfs_init_acl(inode
, dir
);
3630 btrfs_set_trans_block_group(trans
, inode
);
3631 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0, index
);
3635 inode
->i_mapping
->a_ops
= &btrfs_aops
;
3636 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
3637 inode
->i_fop
= &btrfs_file_operations
;
3638 inode
->i_op
= &btrfs_file_inode_operations
;
3639 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
3641 dir
->i_sb
->s_dirt
= 1;
3642 btrfs_update_inode_block_group(trans
, inode
);
3643 btrfs_update_inode_block_group(trans
, dir
);
3645 nr
= trans
->blocks_used
;
3646 btrfs_end_transaction_throttle(trans
, root
);
3649 inode_dec_link_count(inode
);
3652 btrfs_btree_balance_dirty(root
, nr
);
3656 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
3657 struct dentry
*dentry
)
3659 struct btrfs_trans_handle
*trans
;
3660 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3661 struct inode
*inode
= old_dentry
->d_inode
;
3663 unsigned long nr
= 0;
3667 if (inode
->i_nlink
== 0)
3670 btrfs_inc_nlink(inode
);
3671 err
= btrfs_check_free_space(root
, 1, 0);
3674 err
= btrfs_set_inode_index(dir
, &index
);
3678 trans
= btrfs_start_transaction(root
, 1);
3680 btrfs_set_trans_block_group(trans
, dir
);
3681 atomic_inc(&inode
->i_count
);
3683 err
= btrfs_add_nondir(trans
, dentry
, inode
, 1, index
);
3688 dir
->i_sb
->s_dirt
= 1;
3689 btrfs_update_inode_block_group(trans
, dir
);
3690 err
= btrfs_update_inode(trans
, root
, inode
);
3695 nr
= trans
->blocks_used
;
3696 btrfs_end_transaction_throttle(trans
, root
);
3699 inode_dec_link_count(inode
);
3702 btrfs_btree_balance_dirty(root
, nr
);
3706 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
3708 struct inode
*inode
= NULL
;
3709 struct btrfs_trans_handle
*trans
;
3710 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3712 int drop_on_err
= 0;
3715 unsigned long nr
= 1;
3717 err
= btrfs_check_free_space(root
, 1, 0);
3721 trans
= btrfs_start_transaction(root
, 1);
3722 btrfs_set_trans_block_group(trans
, dir
);
3724 if (IS_ERR(trans
)) {
3725 err
= PTR_ERR(trans
);
3729 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
3735 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
3737 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
3738 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
,
3740 if (IS_ERR(inode
)) {
3741 err
= PTR_ERR(inode
);
3747 err
= btrfs_init_acl(inode
, dir
);
3751 inode
->i_op
= &btrfs_dir_inode_operations
;
3752 inode
->i_fop
= &btrfs_dir_file_operations
;
3753 btrfs_set_trans_block_group(trans
, inode
);
3755 btrfs_i_size_write(inode
, 0);
3756 err
= btrfs_update_inode(trans
, root
, inode
);
3760 err
= btrfs_add_link(trans
, dentry
->d_parent
->d_inode
,
3761 inode
, dentry
->d_name
.name
,
3762 dentry
->d_name
.len
, 0, index
);
3766 d_instantiate(dentry
, inode
);
3768 dir
->i_sb
->s_dirt
= 1;
3769 btrfs_update_inode_block_group(trans
, inode
);
3770 btrfs_update_inode_block_group(trans
, dir
);
3773 nr
= trans
->blocks_used
;
3774 btrfs_end_transaction_throttle(trans
, root
);
3779 btrfs_btree_balance_dirty(root
, nr
);
3783 /* helper for btfs_get_extent. Given an existing extent in the tree,
3784 * and an extent that you want to insert, deal with overlap and insert
3785 * the new extent into the tree.
3787 static int merge_extent_mapping(struct extent_map_tree
*em_tree
,
3788 struct extent_map
*existing
,
3789 struct extent_map
*em
,
3790 u64 map_start
, u64 map_len
)
3794 BUG_ON(map_start
< em
->start
|| map_start
>= extent_map_end(em
));
3795 start_diff
= map_start
- em
->start
;
3796 em
->start
= map_start
;
3798 if (em
->block_start
< EXTENT_MAP_LAST_BYTE
&&
3799 !test_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
)) {
3800 em
->block_start
+= start_diff
;
3801 em
->block_len
-= start_diff
;
3803 return add_extent_mapping(em_tree
, em
);
3806 static noinline
int uncompress_inline(struct btrfs_path
*path
,
3807 struct inode
*inode
, struct page
*page
,
3808 size_t pg_offset
, u64 extent_offset
,
3809 struct btrfs_file_extent_item
*item
)
3812 struct extent_buffer
*leaf
= path
->nodes
[0];
3815 unsigned long inline_size
;
3818 WARN_ON(pg_offset
!= 0);
3819 max_size
= btrfs_file_extent_ram_bytes(leaf
, item
);
3820 inline_size
= btrfs_file_extent_inline_item_len(leaf
,
3821 btrfs_item_nr(leaf
, path
->slots
[0]));
3822 tmp
= kmalloc(inline_size
, GFP_NOFS
);
3823 ptr
= btrfs_file_extent_inline_start(item
);
3825 read_extent_buffer(leaf
, tmp
, ptr
, inline_size
);
3827 max_size
= min_t(unsigned long, PAGE_CACHE_SIZE
, max_size
);
3828 ret
= btrfs_zlib_decompress(tmp
, page
, extent_offset
,
3829 inline_size
, max_size
);
3831 char *kaddr
= kmap_atomic(page
, KM_USER0
);
3832 unsigned long copy_size
= min_t(u64
,
3833 PAGE_CACHE_SIZE
- pg_offset
,
3834 max_size
- extent_offset
);
3835 memset(kaddr
+ pg_offset
, 0, copy_size
);
3836 kunmap_atomic(kaddr
, KM_USER0
);
3843 * a bit scary, this does extent mapping from logical file offset to the disk.
3844 * the ugly parts come from merging extents from the disk with the
3845 * in-ram representation. This gets more complex because of the data=ordered code,
3846 * where the in-ram extents might be locked pending data=ordered completion.
3848 * This also copies inline extents directly into the page.
3850 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
3851 size_t pg_offset
, u64 start
, u64 len
,
3857 u64 extent_start
= 0;
3859 u64 objectid
= inode
->i_ino
;
3861 struct btrfs_path
*path
= NULL
;
3862 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3863 struct btrfs_file_extent_item
*item
;
3864 struct extent_buffer
*leaf
;
3865 struct btrfs_key found_key
;
3866 struct extent_map
*em
= NULL
;
3867 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
3868 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
3869 struct btrfs_trans_handle
*trans
= NULL
;
3873 spin_lock(&em_tree
->lock
);
3874 em
= lookup_extent_mapping(em_tree
, start
, len
);
3876 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
3877 spin_unlock(&em_tree
->lock
);
3880 if (em
->start
> start
|| em
->start
+ em
->len
<= start
)
3881 free_extent_map(em
);
3882 else if (em
->block_start
== EXTENT_MAP_INLINE
&& page
)
3883 free_extent_map(em
);
3887 em
= alloc_extent_map(GFP_NOFS
);
3892 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
3893 em
->start
= EXTENT_MAP_HOLE
;
3894 em
->orig_start
= EXTENT_MAP_HOLE
;
3896 em
->block_len
= (u64
)-1;
3899 path
= btrfs_alloc_path();
3903 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
3904 objectid
, start
, trans
!= NULL
);
3911 if (path
->slots
[0] == 0)
3916 leaf
= path
->nodes
[0];
3917 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
3918 struct btrfs_file_extent_item
);
3919 /* are we inside the extent that was found? */
3920 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3921 found_type
= btrfs_key_type(&found_key
);
3922 if (found_key
.objectid
!= objectid
||
3923 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
3927 found_type
= btrfs_file_extent_type(leaf
, item
);
3928 extent_start
= found_key
.offset
;
3929 compressed
= btrfs_file_extent_compression(leaf
, item
);
3930 if (found_type
== BTRFS_FILE_EXTENT_REG
||
3931 found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3932 extent_end
= extent_start
+
3933 btrfs_file_extent_num_bytes(leaf
, item
);
3934 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
3936 size
= btrfs_file_extent_inline_len(leaf
, item
);
3937 extent_end
= (extent_start
+ size
+ root
->sectorsize
- 1) &
3938 ~((u64
)root
->sectorsize
- 1);
3941 if (start
>= extent_end
) {
3943 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
3944 ret
= btrfs_next_leaf(root
, path
);
3951 leaf
= path
->nodes
[0];
3953 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3954 if (found_key
.objectid
!= objectid
||
3955 found_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
3957 if (start
+ len
<= found_key
.offset
)
3960 em
->len
= found_key
.offset
- start
;
3964 if (found_type
== BTRFS_FILE_EXTENT_REG
||
3965 found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3966 em
->start
= extent_start
;
3967 em
->len
= extent_end
- extent_start
;
3968 em
->orig_start
= extent_start
-
3969 btrfs_file_extent_offset(leaf
, item
);
3970 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
3972 em
->block_start
= EXTENT_MAP_HOLE
;
3976 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
3977 em
->block_start
= bytenr
;
3978 em
->block_len
= btrfs_file_extent_disk_num_bytes(leaf
,
3981 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
3982 em
->block_start
= bytenr
;
3983 em
->block_len
= em
->len
;
3984 if (found_type
== BTRFS_FILE_EXTENT_PREALLOC
)
3985 set_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
);
3988 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
3992 size_t extent_offset
;
3995 em
->block_start
= EXTENT_MAP_INLINE
;
3996 if (!page
|| create
) {
3997 em
->start
= extent_start
;
3998 em
->len
= extent_end
- extent_start
;
4002 size
= btrfs_file_extent_inline_len(leaf
, item
);
4003 extent_offset
= page_offset(page
) + pg_offset
- extent_start
;
4004 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- pg_offset
,
4005 size
- extent_offset
);
4006 em
->start
= extent_start
+ extent_offset
;
4007 em
->len
= (copy_size
+ root
->sectorsize
- 1) &
4008 ~((u64
)root
->sectorsize
- 1);
4009 em
->orig_start
= EXTENT_MAP_INLINE
;
4011 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
4012 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
4013 if (create
== 0 && !PageUptodate(page
)) {
4014 if (btrfs_file_extent_compression(leaf
, item
) ==
4015 BTRFS_COMPRESS_ZLIB
) {
4016 ret
= uncompress_inline(path
, inode
, page
,
4018 extent_offset
, item
);
4022 read_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
4026 flush_dcache_page(page
);
4027 } else if (create
&& PageUptodate(page
)) {
4030 free_extent_map(em
);
4032 btrfs_release_path(root
, path
);
4033 trans
= btrfs_join_transaction(root
, 1);
4037 write_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
4040 btrfs_mark_buffer_dirty(leaf
);
4042 set_extent_uptodate(io_tree
, em
->start
,
4043 extent_map_end(em
) - 1, GFP_NOFS
);
4046 printk("unkknown found_type %d\n", found_type
);
4053 em
->block_start
= EXTENT_MAP_HOLE
;
4054 set_bit(EXTENT_FLAG_VACANCY
, &em
->flags
);
4056 btrfs_release_path(root
, path
);
4057 if (em
->start
> start
|| extent_map_end(em
) <= start
) {
4058 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->len
, start
, len
);
4064 spin_lock(&em_tree
->lock
);
4065 ret
= add_extent_mapping(em_tree
, em
);
4066 /* it is possible that someone inserted the extent into the tree
4067 * while we had the lock dropped. It is also possible that
4068 * an overlapping map exists in the tree
4070 if (ret
== -EEXIST
) {
4071 struct extent_map
*existing
;
4075 existing
= lookup_extent_mapping(em_tree
, start
, len
);
4076 if (existing
&& (existing
->start
> start
||
4077 existing
->start
+ existing
->len
<= start
)) {
4078 free_extent_map(existing
);
4082 existing
= lookup_extent_mapping(em_tree
, em
->start
,
4085 err
= merge_extent_mapping(em_tree
, existing
,
4088 free_extent_map(existing
);
4090 free_extent_map(em
);
4095 printk("failing to insert %Lu %Lu\n",
4097 free_extent_map(em
);
4101 free_extent_map(em
);
4106 spin_unlock(&em_tree
->lock
);
4109 btrfs_free_path(path
);
4111 ret
= btrfs_end_transaction(trans
, root
);
4117 free_extent_map(em
);
4119 return ERR_PTR(err
);
4124 static ssize_t
btrfs_direct_IO(int rw
, struct kiocb
*iocb
,
4125 const struct iovec
*iov
, loff_t offset
,
4126 unsigned long nr_segs
)
4131 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
4133 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
4136 int btrfs_readpage(struct file
*file
, struct page
*page
)
4138 struct extent_io_tree
*tree
;
4139 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
4140 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
4143 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
4145 struct extent_io_tree
*tree
;
4148 if (current
->flags
& PF_MEMALLOC
) {
4149 redirty_page_for_writepage(wbc
, page
);
4153 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
4154 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
4157 int btrfs_writepages(struct address_space
*mapping
,
4158 struct writeback_control
*wbc
)
4160 struct extent_io_tree
*tree
;
4162 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
4163 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
4167 btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
4168 struct list_head
*pages
, unsigned nr_pages
)
4170 struct extent_io_tree
*tree
;
4171 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
4172 return extent_readpages(tree
, mapping
, pages
, nr_pages
,
4175 static int __btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
4177 struct extent_io_tree
*tree
;
4178 struct extent_map_tree
*map
;
4181 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
4182 map
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
4183 ret
= try_release_extent_mapping(map
, tree
, page
, gfp_flags
);
4185 ClearPagePrivate(page
);
4186 set_page_private(page
, 0);
4187 page_cache_release(page
);
4192 static int btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
4194 if (PageWriteback(page
) || PageDirty(page
))
4196 return __btrfs_releasepage(page
, gfp_flags
);
4199 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
4201 struct extent_io_tree
*tree
;
4202 struct btrfs_ordered_extent
*ordered
;
4203 u64 page_start
= page_offset(page
);
4204 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
4206 wait_on_page_writeback(page
);
4207 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
4209 btrfs_releasepage(page
, GFP_NOFS
);
4213 lock_extent(tree
, page_start
, page_end
, GFP_NOFS
);
4214 ordered
= btrfs_lookup_ordered_extent(page
->mapping
->host
,
4218 * IO on this page will never be started, so we need
4219 * to account for any ordered extents now
4221 clear_extent_bit(tree
, page_start
, page_end
,
4222 EXTENT_DIRTY
| EXTENT_DELALLOC
|
4223 EXTENT_LOCKED
, 1, 0, GFP_NOFS
);
4224 btrfs_finish_ordered_io(page
->mapping
->host
,
4225 page_start
, page_end
);
4226 btrfs_put_ordered_extent(ordered
);
4227 lock_extent(tree
, page_start
, page_end
, GFP_NOFS
);
4229 clear_extent_bit(tree
, page_start
, page_end
,
4230 EXTENT_LOCKED
| EXTENT_DIRTY
| EXTENT_DELALLOC
|
4233 __btrfs_releasepage(page
, GFP_NOFS
);
4235 ClearPageChecked(page
);
4236 if (PagePrivate(page
)) {
4237 ClearPagePrivate(page
);
4238 set_page_private(page
, 0);
4239 page_cache_release(page
);
4244 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
4245 * called from a page fault handler when a page is first dirtied. Hence we must
4246 * be careful to check for EOF conditions here. We set the page up correctly
4247 * for a written page which means we get ENOSPC checking when writing into
4248 * holes and correct delalloc and unwritten extent mapping on filesystems that
4249 * support these features.
4251 * We are not allowed to take the i_mutex here so we have to play games to
4252 * protect against truncate races as the page could now be beyond EOF. Because
4253 * vmtruncate() writes the inode size before removing pages, once we have the
4254 * page lock we can determine safely if the page is beyond EOF. If it is not
4255 * beyond EOF, then the page is guaranteed safe against truncation until we
4258 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
4260 struct inode
*inode
= fdentry(vma
->vm_file
)->d_inode
;
4261 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4262 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4263 struct btrfs_ordered_extent
*ordered
;
4265 unsigned long zero_start
;
4271 ret
= btrfs_check_free_space(root
, PAGE_CACHE_SIZE
, 0);
4278 size
= i_size_read(inode
);
4279 page_start
= page_offset(page
);
4280 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
4282 if ((page
->mapping
!= inode
->i_mapping
) ||
4283 (page_start
>= size
)) {
4284 /* page got truncated out from underneath us */
4287 wait_on_page_writeback(page
);
4289 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
4290 set_page_extent_mapped(page
);
4293 * we can't set the delalloc bits if there are pending ordered
4294 * extents. Drop our locks and wait for them to finish
4296 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
4298 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
4300 btrfs_start_ordered_extent(inode
, ordered
, 1);
4301 btrfs_put_ordered_extent(ordered
);
4305 btrfs_set_extent_delalloc(inode
, page_start
, page_end
);
4308 /* page is wholly or partially inside EOF */
4309 if (page_start
+ PAGE_CACHE_SIZE
> size
)
4310 zero_start
= size
& ~PAGE_CACHE_MASK
;
4312 zero_start
= PAGE_CACHE_SIZE
;
4314 if (zero_start
!= PAGE_CACHE_SIZE
) {
4316 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
4317 flush_dcache_page(page
);
4320 ClearPageChecked(page
);
4321 set_page_dirty(page
);
4322 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
4330 static void btrfs_truncate(struct inode
*inode
)
4332 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4334 struct btrfs_trans_handle
*trans
;
4336 u64 mask
= root
->sectorsize
- 1;
4338 if (!S_ISREG(inode
->i_mode
))
4340 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
4343 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
4344 btrfs_wait_ordered_range(inode
, inode
->i_size
& (~mask
), (u64
)-1);
4346 trans
= btrfs_start_transaction(root
, 1);
4347 btrfs_set_trans_block_group(trans
, inode
);
4348 btrfs_i_size_write(inode
, inode
->i_size
);
4350 ret
= btrfs_orphan_add(trans
, inode
);
4353 /* FIXME, add redo link to tree so we don't leak on crash */
4354 ret
= btrfs_truncate_inode_items(trans
, root
, inode
, inode
->i_size
,
4355 BTRFS_EXTENT_DATA_KEY
);
4356 btrfs_update_inode(trans
, root
, inode
);
4358 ret
= btrfs_orphan_del(trans
, inode
);
4362 nr
= trans
->blocks_used
;
4363 ret
= btrfs_end_transaction_throttle(trans
, root
);
4365 btrfs_btree_balance_dirty(root
, nr
);
4369 * Invalidate a single dcache entry at the root of the filesystem.
4370 * Needed after creation of snapshot or subvolume.
4372 void btrfs_invalidate_dcache_root(struct inode
*dir
, char *name
,
4375 struct dentry
*alias
, *entry
;
4378 alias
= d_find_alias(dir
);
4382 /* change me if btrfs ever gets a d_hash operation */
4383 qstr
.hash
= full_name_hash(qstr
.name
, qstr
.len
);
4384 entry
= d_lookup(alias
, &qstr
);
4387 d_invalidate(entry
);
4394 * create a new subvolume directory/inode (helper for the ioctl).
4396 int btrfs_create_subvol_root(struct btrfs_root
*new_root
, struct dentry
*dentry
,
4397 struct btrfs_trans_handle
*trans
, u64 new_dirid
,
4398 struct btrfs_block_group_cache
*block_group
)
4400 struct inode
*inode
;
4404 inode
= btrfs_new_inode(trans
, new_root
, NULL
, "..", 2, new_dirid
,
4405 new_dirid
, block_group
, S_IFDIR
| 0700, &index
);
4407 return PTR_ERR(inode
);
4408 inode
->i_op
= &btrfs_dir_inode_operations
;
4409 inode
->i_fop
= &btrfs_dir_file_operations
;
4412 btrfs_i_size_write(inode
, 0);
4414 error
= btrfs_update_inode(trans
, new_root
, inode
);
4418 d_instantiate(dentry
, inode
);
4422 /* helper function for file defrag and space balancing. This
4423 * forces readahead on a given range of bytes in an inode
4425 unsigned long btrfs_force_ra(struct address_space
*mapping
,
4426 struct file_ra_state
*ra
, struct file
*file
,
4427 pgoff_t offset
, pgoff_t last_index
)
4429 pgoff_t req_size
= last_index
- offset
+ 1;
4431 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
4432 return offset
+ req_size
;
4435 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
4437 struct btrfs_inode
*ei
;
4439 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
4443 ei
->logged_trans
= 0;
4444 btrfs_ordered_inode_tree_init(&ei
->ordered_tree
);
4445 ei
->i_acl
= BTRFS_ACL_NOT_CACHED
;
4446 ei
->i_default_acl
= BTRFS_ACL_NOT_CACHED
;
4447 INIT_LIST_HEAD(&ei
->i_orphan
);
4448 return &ei
->vfs_inode
;
4451 void btrfs_destroy_inode(struct inode
*inode
)
4453 struct btrfs_ordered_extent
*ordered
;
4454 WARN_ON(!list_empty(&inode
->i_dentry
));
4455 WARN_ON(inode
->i_data
.nrpages
);
4457 if (BTRFS_I(inode
)->i_acl
&&
4458 BTRFS_I(inode
)->i_acl
!= BTRFS_ACL_NOT_CACHED
)
4459 posix_acl_release(BTRFS_I(inode
)->i_acl
);
4460 if (BTRFS_I(inode
)->i_default_acl
&&
4461 BTRFS_I(inode
)->i_default_acl
!= BTRFS_ACL_NOT_CACHED
)
4462 posix_acl_release(BTRFS_I(inode
)->i_default_acl
);
4464 spin_lock(&BTRFS_I(inode
)->root
->list_lock
);
4465 if (!list_empty(&BTRFS_I(inode
)->i_orphan
)) {
4466 printk(KERN_ERR
"BTRFS: inode %lu: inode still on the orphan"
4467 " list\n", inode
->i_ino
);
4470 spin_unlock(&BTRFS_I(inode
)->root
->list_lock
);
4473 ordered
= btrfs_lookup_first_ordered_extent(inode
, (u64
)-1);
4477 printk("found ordered extent %Lu %Lu\n",
4478 ordered
->file_offset
, ordered
->len
);
4479 btrfs_remove_ordered_extent(inode
, ordered
);
4480 btrfs_put_ordered_extent(ordered
);
4481 btrfs_put_ordered_extent(ordered
);
4484 btrfs_drop_extent_cache(inode
, 0, (u64
)-1, 0);
4485 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
4488 static void init_once(void *foo
)
4490 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
4492 inode_init_once(&ei
->vfs_inode
);
4495 void btrfs_destroy_cachep(void)
4497 if (btrfs_inode_cachep
)
4498 kmem_cache_destroy(btrfs_inode_cachep
);
4499 if (btrfs_trans_handle_cachep
)
4500 kmem_cache_destroy(btrfs_trans_handle_cachep
);
4501 if (btrfs_transaction_cachep
)
4502 kmem_cache_destroy(btrfs_transaction_cachep
);
4503 if (btrfs_bit_radix_cachep
)
4504 kmem_cache_destroy(btrfs_bit_radix_cachep
);
4505 if (btrfs_path_cachep
)
4506 kmem_cache_destroy(btrfs_path_cachep
);
4509 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
4510 unsigned long extra_flags
,
4511 void (*ctor
)(void *))
4513 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
4514 SLAB_MEM_SPREAD
| extra_flags
), ctor
);
4517 int btrfs_init_cachep(void)
4519 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
4520 sizeof(struct btrfs_inode
),
4522 if (!btrfs_inode_cachep
)
4524 btrfs_trans_handle_cachep
=
4525 btrfs_cache_create("btrfs_trans_handle_cache",
4526 sizeof(struct btrfs_trans_handle
),
4528 if (!btrfs_trans_handle_cachep
)
4530 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
4531 sizeof(struct btrfs_transaction
),
4533 if (!btrfs_transaction_cachep
)
4535 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
4536 sizeof(struct btrfs_path
),
4538 if (!btrfs_path_cachep
)
4540 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
4541 SLAB_DESTROY_BY_RCU
, NULL
);
4542 if (!btrfs_bit_radix_cachep
)
4546 btrfs_destroy_cachep();
4550 static int btrfs_getattr(struct vfsmount
*mnt
,
4551 struct dentry
*dentry
, struct kstat
*stat
)
4553 struct inode
*inode
= dentry
->d_inode
;
4554 generic_fillattr(inode
, stat
);
4555 stat
->dev
= BTRFS_I(inode
)->root
->anon_super
.s_dev
;
4556 stat
->blksize
= PAGE_CACHE_SIZE
;
4557 stat
->blocks
= (inode_get_bytes(inode
) +
4558 BTRFS_I(inode
)->delalloc_bytes
) >> 9;
4562 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
4563 struct inode
* new_dir
,struct dentry
*new_dentry
)
4565 struct btrfs_trans_handle
*trans
;
4566 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
4567 struct inode
*new_inode
= new_dentry
->d_inode
;
4568 struct inode
*old_inode
= old_dentry
->d_inode
;
4569 struct timespec ctime
= CURRENT_TIME
;
4573 /* we're not allowed to rename between subvolumes */
4574 if (BTRFS_I(old_inode
)->root
->root_key
.objectid
!=
4575 BTRFS_I(new_dir
)->root
->root_key
.objectid
)
4578 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
4579 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
4583 ret
= btrfs_check_free_space(root
, 1, 0);
4587 trans
= btrfs_start_transaction(root
, 1);
4589 btrfs_set_trans_block_group(trans
, new_dir
);
4591 btrfs_inc_nlink(old_dentry
->d_inode
);
4592 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
4593 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
4594 old_inode
->i_ctime
= ctime
;
4596 ret
= btrfs_unlink_inode(trans
, root
, old_dir
, old_dentry
->d_inode
,
4597 old_dentry
->d_name
.name
,
4598 old_dentry
->d_name
.len
);
4603 new_inode
->i_ctime
= CURRENT_TIME
;
4604 ret
= btrfs_unlink_inode(trans
, root
, new_dir
,
4605 new_dentry
->d_inode
,
4606 new_dentry
->d_name
.name
,
4607 new_dentry
->d_name
.len
);
4610 if (new_inode
->i_nlink
== 0) {
4611 ret
= btrfs_orphan_add(trans
, new_dentry
->d_inode
);
4617 ret
= btrfs_set_inode_index(new_dir
, &index
);
4621 ret
= btrfs_add_link(trans
, new_dentry
->d_parent
->d_inode
,
4622 old_inode
, new_dentry
->d_name
.name
,
4623 new_dentry
->d_name
.len
, 1, index
);
4628 btrfs_end_transaction_throttle(trans
, root
);
4634 * some fairly slow code that needs optimization. This walks the list
4635 * of all the inodes with pending delalloc and forces them to disk.
4637 int btrfs_start_delalloc_inodes(struct btrfs_root
*root
)
4639 struct list_head
*head
= &root
->fs_info
->delalloc_inodes
;
4640 struct btrfs_inode
*binode
;
4641 struct inode
*inode
;
4642 unsigned long flags
;
4644 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
)
4647 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
4648 while(!list_empty(head
)) {
4649 binode
= list_entry(head
->next
, struct btrfs_inode
,
4651 inode
= igrab(&binode
->vfs_inode
);
4653 list_del_init(&binode
->delalloc_inodes
);
4654 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
4656 filemap_flush(inode
->i_mapping
);
4660 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
4662 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
4664 /* the filemap_flush will queue IO into the worker threads, but
4665 * we have to make sure the IO is actually started and that
4666 * ordered extents get created before we return
4668 atomic_inc(&root
->fs_info
->async_submit_draining
);
4669 while(atomic_read(&root
->fs_info
->nr_async_submits
) ||
4670 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
4671 wait_event(root
->fs_info
->async_submit_wait
,
4672 (atomic_read(&root
->fs_info
->nr_async_submits
) == 0 &&
4673 atomic_read(&root
->fs_info
->async_delalloc_pages
) == 0));
4675 atomic_dec(&root
->fs_info
->async_submit_draining
);
4679 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
4680 const char *symname
)
4682 struct btrfs_trans_handle
*trans
;
4683 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
4684 struct btrfs_path
*path
;
4685 struct btrfs_key key
;
4686 struct inode
*inode
= NULL
;
4694 struct btrfs_file_extent_item
*ei
;
4695 struct extent_buffer
*leaf
;
4696 unsigned long nr
= 0;
4698 name_len
= strlen(symname
) + 1;
4699 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
4700 return -ENAMETOOLONG
;
4702 err
= btrfs_check_free_space(root
, 1, 0);
4706 trans
= btrfs_start_transaction(root
, 1);
4707 btrfs_set_trans_block_group(trans
, dir
);
4709 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
4715 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
4717 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
4718 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
,
4720 err
= PTR_ERR(inode
);
4724 err
= btrfs_init_acl(inode
, dir
);
4730 btrfs_set_trans_block_group(trans
, inode
);
4731 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0, index
);
4735 inode
->i_mapping
->a_ops
= &btrfs_aops
;
4736 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
4737 inode
->i_fop
= &btrfs_file_operations
;
4738 inode
->i_op
= &btrfs_file_inode_operations
;
4739 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
4741 dir
->i_sb
->s_dirt
= 1;
4742 btrfs_update_inode_block_group(trans
, inode
);
4743 btrfs_update_inode_block_group(trans
, dir
);
4747 path
= btrfs_alloc_path();
4749 key
.objectid
= inode
->i_ino
;
4751 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
4752 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
4753 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
4759 leaf
= path
->nodes
[0];
4760 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
4761 struct btrfs_file_extent_item
);
4762 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
4763 btrfs_set_file_extent_type(leaf
, ei
,
4764 BTRFS_FILE_EXTENT_INLINE
);
4765 btrfs_set_file_extent_encryption(leaf
, ei
, 0);
4766 btrfs_set_file_extent_compression(leaf
, ei
, 0);
4767 btrfs_set_file_extent_other_encoding(leaf
, ei
, 0);
4768 btrfs_set_file_extent_ram_bytes(leaf
, ei
, name_len
);
4770 ptr
= btrfs_file_extent_inline_start(ei
);
4771 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
4772 btrfs_mark_buffer_dirty(leaf
);
4773 btrfs_free_path(path
);
4775 inode
->i_op
= &btrfs_symlink_inode_operations
;
4776 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
4777 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
4778 inode_set_bytes(inode
, name_len
);
4779 btrfs_i_size_write(inode
, name_len
- 1);
4780 err
= btrfs_update_inode(trans
, root
, inode
);
4785 nr
= trans
->blocks_used
;
4786 btrfs_end_transaction_throttle(trans
, root
);
4789 inode_dec_link_count(inode
);
4792 btrfs_btree_balance_dirty(root
, nr
);
4796 static int prealloc_file_range(struct inode
*inode
, u64 start
, u64 end
,
4797 u64 alloc_hint
, int mode
)
4799 struct btrfs_trans_handle
*trans
;
4800 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4801 struct btrfs_key ins
;
4803 u64 cur_offset
= start
;
4804 u64 num_bytes
= end
- start
;
4807 trans
= btrfs_join_transaction(root
, 1);
4809 btrfs_set_trans_block_group(trans
, inode
);
4811 while (num_bytes
> 0) {
4812 alloc_size
= min(num_bytes
, root
->fs_info
->max_extent
);
4813 ret
= btrfs_reserve_extent(trans
, root
, alloc_size
,
4814 root
->sectorsize
, 0, alloc_hint
,
4820 ret
= insert_reserved_file_extent(trans
, inode
,
4821 cur_offset
, ins
.objectid
,
4822 ins
.offset
, ins
.offset
,
4823 ins
.offset
, 0, 0, 0,
4824 BTRFS_FILE_EXTENT_PREALLOC
);
4826 num_bytes
-= ins
.offset
;
4827 cur_offset
+= ins
.offset
;
4828 alloc_hint
= ins
.objectid
+ ins
.offset
;
4831 if (cur_offset
> start
) {
4832 inode
->i_ctime
= CURRENT_TIME
;
4833 btrfs_set_flag(inode
, PREALLOC
);
4834 if (!(mode
& FALLOC_FL_KEEP_SIZE
) &&
4835 cur_offset
> i_size_read(inode
))
4836 btrfs_i_size_write(inode
, cur_offset
);
4837 ret
= btrfs_update_inode(trans
, root
, inode
);
4841 btrfs_end_transaction(trans
, root
);
4845 static long btrfs_fallocate(struct inode
*inode
, int mode
,
4846 loff_t offset
, loff_t len
)
4853 u64 mask
= BTRFS_I(inode
)->root
->sectorsize
- 1;
4854 struct extent_map
*em
;
4857 alloc_start
= offset
& ~mask
;
4858 alloc_end
= (offset
+ len
+ mask
) & ~mask
;
4860 mutex_lock(&inode
->i_mutex
);
4861 if (alloc_start
> inode
->i_size
) {
4862 ret
= btrfs_cont_expand(inode
, alloc_start
);
4868 struct btrfs_ordered_extent
*ordered
;
4869 lock_extent(&BTRFS_I(inode
)->io_tree
, alloc_start
,
4870 alloc_end
- 1, GFP_NOFS
);
4871 ordered
= btrfs_lookup_first_ordered_extent(inode
,
4874 ordered
->file_offset
+ ordered
->len
> alloc_start
&&
4875 ordered
->file_offset
< alloc_end
) {
4876 btrfs_put_ordered_extent(ordered
);
4877 unlock_extent(&BTRFS_I(inode
)->io_tree
,
4878 alloc_start
, alloc_end
- 1, GFP_NOFS
);
4879 btrfs_wait_ordered_range(inode
, alloc_start
,
4880 alloc_end
- alloc_start
);
4883 btrfs_put_ordered_extent(ordered
);
4888 cur_offset
= alloc_start
;
4890 em
= btrfs_get_extent(inode
, NULL
, 0, cur_offset
,
4891 alloc_end
- cur_offset
, 0);
4892 BUG_ON(IS_ERR(em
) || !em
);
4893 last_byte
= min(extent_map_end(em
), alloc_end
);
4894 last_byte
= (last_byte
+ mask
) & ~mask
;
4895 if (em
->block_start
== EXTENT_MAP_HOLE
) {
4896 ret
= prealloc_file_range(inode
, cur_offset
,
4897 last_byte
, alloc_hint
, mode
);
4899 free_extent_map(em
);
4903 if (em
->block_start
<= EXTENT_MAP_LAST_BYTE
)
4904 alloc_hint
= em
->block_start
;
4905 free_extent_map(em
);
4907 cur_offset
= last_byte
;
4908 if (cur_offset
>= alloc_end
) {
4913 unlock_extent(&BTRFS_I(inode
)->io_tree
, alloc_start
, alloc_end
- 1,
4916 mutex_unlock(&inode
->i_mutex
);
4920 static int btrfs_set_page_dirty(struct page
*page
)
4922 return __set_page_dirty_nobuffers(page
);
4925 static int btrfs_permission(struct inode
*inode
, int mask
)
4927 if (btrfs_test_flag(inode
, READONLY
) && (mask
& MAY_WRITE
))
4929 return generic_permission(inode
, mask
, btrfs_check_acl
);
4932 static struct inode_operations btrfs_dir_inode_operations
= {
4933 .getattr
= btrfs_getattr
,
4934 .lookup
= btrfs_lookup
,
4935 .create
= btrfs_create
,
4936 .unlink
= btrfs_unlink
,
4938 .mkdir
= btrfs_mkdir
,
4939 .rmdir
= btrfs_rmdir
,
4940 .rename
= btrfs_rename
,
4941 .symlink
= btrfs_symlink
,
4942 .setattr
= btrfs_setattr
,
4943 .mknod
= btrfs_mknod
,
4944 .setxattr
= btrfs_setxattr
,
4945 .getxattr
= btrfs_getxattr
,
4946 .listxattr
= btrfs_listxattr
,
4947 .removexattr
= btrfs_removexattr
,
4948 .permission
= btrfs_permission
,
4950 static struct inode_operations btrfs_dir_ro_inode_operations
= {
4951 .lookup
= btrfs_lookup
,
4952 .permission
= btrfs_permission
,
4954 static struct file_operations btrfs_dir_file_operations
= {
4955 .llseek
= generic_file_llseek
,
4956 .read
= generic_read_dir
,
4957 .readdir
= btrfs_real_readdir
,
4958 .unlocked_ioctl
= btrfs_ioctl
,
4959 #ifdef CONFIG_COMPAT
4960 .compat_ioctl
= btrfs_ioctl
,
4962 .release
= btrfs_release_file
,
4963 .fsync
= btrfs_sync_file
,
4966 static struct extent_io_ops btrfs_extent_io_ops
= {
4967 .fill_delalloc
= run_delalloc_range
,
4968 .submit_bio_hook
= btrfs_submit_bio_hook
,
4969 .merge_bio_hook
= btrfs_merge_bio_hook
,
4970 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
4971 .writepage_end_io_hook
= btrfs_writepage_end_io_hook
,
4972 .writepage_start_hook
= btrfs_writepage_start_hook
,
4973 .readpage_io_failed_hook
= btrfs_io_failed_hook
,
4974 .set_bit_hook
= btrfs_set_bit_hook
,
4975 .clear_bit_hook
= btrfs_clear_bit_hook
,
4978 static struct address_space_operations btrfs_aops
= {
4979 .readpage
= btrfs_readpage
,
4980 .writepage
= btrfs_writepage
,
4981 .writepages
= btrfs_writepages
,
4982 .readpages
= btrfs_readpages
,
4983 .sync_page
= block_sync_page
,
4985 .direct_IO
= btrfs_direct_IO
,
4986 .invalidatepage
= btrfs_invalidatepage
,
4987 .releasepage
= btrfs_releasepage
,
4988 .set_page_dirty
= btrfs_set_page_dirty
,
4991 static struct address_space_operations btrfs_symlink_aops
= {
4992 .readpage
= btrfs_readpage
,
4993 .writepage
= btrfs_writepage
,
4994 .invalidatepage
= btrfs_invalidatepage
,
4995 .releasepage
= btrfs_releasepage
,
4998 static struct inode_operations btrfs_file_inode_operations
= {
4999 .truncate
= btrfs_truncate
,
5000 .getattr
= btrfs_getattr
,
5001 .setattr
= btrfs_setattr
,
5002 .setxattr
= btrfs_setxattr
,
5003 .getxattr
= btrfs_getxattr
,
5004 .listxattr
= btrfs_listxattr
,
5005 .removexattr
= btrfs_removexattr
,
5006 .permission
= btrfs_permission
,
5007 .fallocate
= btrfs_fallocate
,
5009 static struct inode_operations btrfs_special_inode_operations
= {
5010 .getattr
= btrfs_getattr
,
5011 .setattr
= btrfs_setattr
,
5012 .permission
= btrfs_permission
,
5013 .setxattr
= btrfs_setxattr
,
5014 .getxattr
= btrfs_getxattr
,
5015 .listxattr
= btrfs_listxattr
,
5016 .removexattr
= btrfs_removexattr
,
5018 static struct inode_operations btrfs_symlink_inode_operations
= {
5019 .readlink
= generic_readlink
,
5020 .follow_link
= page_follow_link_light
,
5021 .put_link
= page_put_link
,
5022 .permission
= btrfs_permission
,