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>
44 #include "transaction.h"
45 #include "btrfs_inode.h"
47 #include "print-tree.h"
49 #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 nr_pages
= (cur_end
- start
+ PAGE_CACHE_SIZE
) >>
888 atomic_add(nr_pages
, &root
->fs_info
->async_delalloc_pages
);
890 btrfs_queue_worker(&root
->fs_info
->delalloc_workers
,
893 if (atomic_read(&root
->fs_info
->async_delalloc_pages
) > limit
) {
894 wait_event(root
->fs_info
->async_submit_wait
,
895 (atomic_read(&root
->fs_info
->async_delalloc_pages
) <
899 while(atomic_read(&root
->fs_info
->async_submit_draining
) &&
900 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
901 wait_event(root
->fs_info
->async_submit_wait
,
902 (atomic_read(&root
->fs_info
->async_delalloc_pages
) ==
906 *nr_written
+= nr_pages
;
914 * when nowcow writeback call back. This checks for snapshots or COW copies
915 * of the extents that exist in the file, and COWs the file as required.
917 * If no cow copies or snapshots exist, we write directly to the existing
920 static int run_delalloc_nocow(struct inode
*inode
, struct page
*locked_page
,
921 u64 start
, u64 end
, int *page_started
, int force
,
922 unsigned long *nr_written
)
924 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
925 struct btrfs_trans_handle
*trans
;
926 struct extent_buffer
*leaf
;
927 struct btrfs_path
*path
;
928 struct btrfs_file_extent_item
*fi
;
929 struct btrfs_key found_key
;
941 path
= btrfs_alloc_path();
943 trans
= btrfs_join_transaction(root
, 1);
949 ret
= btrfs_lookup_file_extent(trans
, root
, path
, inode
->i_ino
,
952 if (ret
> 0 && path
->slots
[0] > 0 && check_prev
) {
953 leaf
= path
->nodes
[0];
954 btrfs_item_key_to_cpu(leaf
, &found_key
,
956 if (found_key
.objectid
== inode
->i_ino
&&
957 found_key
.type
== BTRFS_EXTENT_DATA_KEY
)
962 leaf
= path
->nodes
[0];
963 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
964 ret
= btrfs_next_leaf(root
, path
);
969 leaf
= path
->nodes
[0];
974 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
976 if (found_key
.objectid
> inode
->i_ino
||
977 found_key
.type
> BTRFS_EXTENT_DATA_KEY
||
978 found_key
.offset
> end
)
981 if (found_key
.offset
> cur_offset
) {
982 extent_end
= found_key
.offset
;
986 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
987 struct btrfs_file_extent_item
);
988 extent_type
= btrfs_file_extent_type(leaf
, fi
);
990 if (extent_type
== BTRFS_FILE_EXTENT_REG
||
991 extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
992 struct btrfs_block_group_cache
*block_group
;
993 disk_bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
994 extent_end
= found_key
.offset
+
995 btrfs_file_extent_num_bytes(leaf
, fi
);
996 if (extent_end
<= start
) {
1000 if (btrfs_file_extent_compression(leaf
, fi
) ||
1001 btrfs_file_extent_encryption(leaf
, fi
) ||
1002 btrfs_file_extent_other_encoding(leaf
, fi
))
1004 if (disk_bytenr
== 0)
1006 if (extent_type
== BTRFS_FILE_EXTENT_REG
&& !force
)
1008 if (btrfs_cross_ref_exist(trans
, root
, disk_bytenr
))
1010 block_group
= btrfs_lookup_block_group(root
->fs_info
,
1012 if (!block_group
|| block_group
->ro
)
1014 disk_bytenr
+= btrfs_file_extent_offset(leaf
, fi
);
1016 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
1017 extent_end
= found_key
.offset
+
1018 btrfs_file_extent_inline_len(leaf
, fi
);
1019 extent_end
= ALIGN(extent_end
, root
->sectorsize
);
1024 if (extent_end
<= start
) {
1029 if (cow_start
== (u64
)-1)
1030 cow_start
= cur_offset
;
1031 cur_offset
= extent_end
;
1032 if (cur_offset
> end
)
1038 btrfs_release_path(root
, path
);
1039 if (cow_start
!= (u64
)-1) {
1040 ret
= cow_file_range(inode
, locked_page
, cow_start
,
1041 found_key
.offset
- 1, page_started
,
1044 cow_start
= (u64
)-1;
1047 disk_bytenr
+= cur_offset
- found_key
.offset
;
1048 num_bytes
= min(end
+ 1, extent_end
) - cur_offset
;
1049 if (extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1050 struct extent_map
*em
;
1051 struct extent_map_tree
*em_tree
;
1052 em_tree
= &BTRFS_I(inode
)->extent_tree
;
1053 em
= alloc_extent_map(GFP_NOFS
);
1054 em
->start
= cur_offset
;
1055 em
->orig_start
= em
->start
;
1056 em
->len
= num_bytes
;
1057 em
->block_len
= num_bytes
;
1058 em
->block_start
= disk_bytenr
;
1059 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
1060 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
1062 spin_lock(&em_tree
->lock
);
1063 ret
= add_extent_mapping(em_tree
, em
);
1064 spin_unlock(&em_tree
->lock
);
1065 if (ret
!= -EEXIST
) {
1066 free_extent_map(em
);
1069 btrfs_drop_extent_cache(inode
, em
->start
,
1070 em
->start
+ em
->len
- 1, 0);
1072 type
= BTRFS_ORDERED_PREALLOC
;
1074 type
= BTRFS_ORDERED_NOCOW
;
1077 ret
= btrfs_add_ordered_extent(inode
, cur_offset
, disk_bytenr
,
1078 num_bytes
, num_bytes
, type
);
1081 extent_clear_unlock_delalloc(inode
, &BTRFS_I(inode
)->io_tree
,
1082 cur_offset
, cur_offset
+ num_bytes
- 1,
1083 locked_page
, 1, 1, 1, 0, 0, 0);
1084 cur_offset
= extent_end
;
1085 if (cur_offset
> end
)
1088 btrfs_release_path(root
, path
);
1090 if (cur_offset
<= end
&& cow_start
== (u64
)-1)
1091 cow_start
= cur_offset
;
1092 if (cow_start
!= (u64
)-1) {
1093 ret
= cow_file_range(inode
, locked_page
, cow_start
, end
,
1094 page_started
, nr_written
, 1);
1098 ret
= btrfs_end_transaction(trans
, root
);
1100 btrfs_free_path(path
);
1105 * extent_io.c call back to do delayed allocation processing
1107 static int run_delalloc_range(struct inode
*inode
, struct page
*locked_page
,
1108 u64 start
, u64 end
, int *page_started
,
1109 unsigned long *nr_written
)
1111 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1114 if (btrfs_test_opt(root
, NODATACOW
) ||
1115 btrfs_test_flag(inode
, NODATACOW
))
1116 ret
= run_delalloc_nocow(inode
, locked_page
, start
, end
,
1117 page_started
, 1, nr_written
);
1118 else if (btrfs_test_flag(inode
, PREALLOC
))
1119 ret
= run_delalloc_nocow(inode
, locked_page
, start
, end
,
1120 page_started
, 0, nr_written
);
1122 ret
= cow_file_range_async(inode
, locked_page
, start
, end
,
1123 page_started
, nr_written
);
1129 * extent_io.c set_bit_hook, used to track delayed allocation
1130 * bytes in this file, and to maintain the list of inodes that
1131 * have pending delalloc work to be done.
1133 static int btrfs_set_bit_hook(struct inode
*inode
, u64 start
, u64 end
,
1134 unsigned long old
, unsigned long bits
)
1136 unsigned long flags
;
1137 if (!(old
& EXTENT_DELALLOC
) && (bits
& EXTENT_DELALLOC
)) {
1138 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1139 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
1140 BTRFS_I(inode
)->delalloc_bytes
+= end
- start
+ 1;
1141 root
->fs_info
->delalloc_bytes
+= end
- start
+ 1;
1142 if (list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
1143 list_add_tail(&BTRFS_I(inode
)->delalloc_inodes
,
1144 &root
->fs_info
->delalloc_inodes
);
1146 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
1152 * extent_io.c clear_bit_hook, see set_bit_hook for why
1154 static int btrfs_clear_bit_hook(struct inode
*inode
, u64 start
, u64 end
,
1155 unsigned long old
, unsigned long bits
)
1157 if ((old
& EXTENT_DELALLOC
) && (bits
& EXTENT_DELALLOC
)) {
1158 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1159 unsigned long flags
;
1161 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
1162 if (end
- start
+ 1 > root
->fs_info
->delalloc_bytes
) {
1163 printk("warning: delalloc account %Lu %Lu\n",
1164 end
- start
+ 1, root
->fs_info
->delalloc_bytes
);
1165 root
->fs_info
->delalloc_bytes
= 0;
1166 BTRFS_I(inode
)->delalloc_bytes
= 0;
1168 root
->fs_info
->delalloc_bytes
-= end
- start
+ 1;
1169 BTRFS_I(inode
)->delalloc_bytes
-= end
- start
+ 1;
1171 if (BTRFS_I(inode
)->delalloc_bytes
== 0 &&
1172 !list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
1173 list_del_init(&BTRFS_I(inode
)->delalloc_inodes
);
1175 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
1181 * extent_io.c merge_bio_hook, this must check the chunk tree to make sure
1182 * we don't create bios that span stripes or chunks
1184 int btrfs_merge_bio_hook(struct page
*page
, unsigned long offset
,
1185 size_t size
, struct bio
*bio
,
1186 unsigned long bio_flags
)
1188 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
1189 struct btrfs_mapping_tree
*map_tree
;
1190 u64 logical
= (u64
)bio
->bi_sector
<< 9;
1195 if (bio_flags
& EXTENT_BIO_COMPRESSED
)
1198 length
= bio
->bi_size
;
1199 map_tree
= &root
->fs_info
->mapping_tree
;
1200 map_length
= length
;
1201 ret
= btrfs_map_block(map_tree
, READ
, logical
,
1202 &map_length
, NULL
, 0);
1204 if (map_length
< length
+ size
) {
1211 * in order to insert checksums into the metadata in large chunks,
1212 * we wait until bio submission time. All the pages in the bio are
1213 * checksummed and sums are attached onto the ordered extent record.
1215 * At IO completion time the cums attached on the ordered extent record
1216 * are inserted into the btree
1218 static int __btrfs_submit_bio_start(struct inode
*inode
, int rw
, struct bio
*bio
,
1219 int mirror_num
, unsigned long bio_flags
)
1221 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1224 ret
= btrfs_csum_one_bio(root
, inode
, bio
, 0, 0);
1230 * in order to insert checksums into the metadata in large chunks,
1231 * we wait until bio submission time. All the pages in the bio are
1232 * checksummed and sums are attached onto the ordered extent record.
1234 * At IO completion time the cums attached on the ordered extent record
1235 * are inserted into the btree
1237 static int __btrfs_submit_bio_done(struct inode
*inode
, int rw
, struct bio
*bio
,
1238 int mirror_num
, unsigned long bio_flags
)
1240 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1241 return btrfs_map_bio(root
, rw
, bio
, mirror_num
, 1);
1245 * extent_io.c submission hook. This does the right thing for csum calculation on write,
1246 * or reading the csums from the tree before a read
1248 static int btrfs_submit_bio_hook(struct inode
*inode
, int rw
, struct bio
*bio
,
1249 int mirror_num
, unsigned long bio_flags
)
1251 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1255 ret
= btrfs_bio_wq_end_io(root
->fs_info
, bio
, 0);
1258 skip_sum
= btrfs_test_opt(root
, NODATASUM
) ||
1259 btrfs_test_flag(inode
, NODATASUM
);
1261 if (!(rw
& (1 << BIO_RW
))) {
1262 if (bio_flags
& EXTENT_BIO_COMPRESSED
) {
1263 return btrfs_submit_compressed_read(inode
, bio
,
1264 mirror_num
, bio_flags
);
1265 } else if (!skip_sum
)
1266 btrfs_lookup_bio_sums(root
, inode
, bio
, NULL
);
1268 } else if (!skip_sum
) {
1269 /* we're doing a write, do the async checksumming */
1270 return btrfs_wq_submit_bio(BTRFS_I(inode
)->root
->fs_info
,
1271 inode
, rw
, bio
, mirror_num
,
1272 bio_flags
, __btrfs_submit_bio_start
,
1273 __btrfs_submit_bio_done
);
1277 return btrfs_map_bio(root
, rw
, bio
, mirror_num
, 0);
1281 * given a list of ordered sums record them in the inode. This happens
1282 * at IO completion time based on sums calculated at bio submission time.
1284 static noinline
int add_pending_csums(struct btrfs_trans_handle
*trans
,
1285 struct inode
*inode
, u64 file_offset
,
1286 struct list_head
*list
)
1288 struct list_head
*cur
;
1289 struct btrfs_ordered_sum
*sum
;
1291 btrfs_set_trans_block_group(trans
, inode
);
1292 list_for_each(cur
, list
) {
1293 sum
= list_entry(cur
, struct btrfs_ordered_sum
, list
);
1294 btrfs_csum_file_blocks(trans
,
1295 BTRFS_I(inode
)->root
->fs_info
->csum_root
, sum
);
1300 int btrfs_set_extent_delalloc(struct inode
*inode
, u64 start
, u64 end
)
1302 if ((end
& (PAGE_CACHE_SIZE
- 1)) == 0) {
1305 return set_extent_delalloc(&BTRFS_I(inode
)->io_tree
, start
, end
,
1309 /* see btrfs_writepage_start_hook for details on why this is required */
1310 struct btrfs_writepage_fixup
{
1312 struct btrfs_work work
;
1315 static void btrfs_writepage_fixup_worker(struct btrfs_work
*work
)
1317 struct btrfs_writepage_fixup
*fixup
;
1318 struct btrfs_ordered_extent
*ordered
;
1320 struct inode
*inode
;
1324 fixup
= container_of(work
, struct btrfs_writepage_fixup
, work
);
1328 if (!page
->mapping
|| !PageDirty(page
) || !PageChecked(page
)) {
1329 ClearPageChecked(page
);
1333 inode
= page
->mapping
->host
;
1334 page_start
= page_offset(page
);
1335 page_end
= page_offset(page
) + PAGE_CACHE_SIZE
- 1;
1337 lock_extent(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
, GFP_NOFS
);
1339 /* already ordered? We're done */
1340 if (test_range_bit(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
,
1341 EXTENT_ORDERED
, 0)) {
1345 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
1347 unlock_extent(&BTRFS_I(inode
)->io_tree
, page_start
,
1348 page_end
, GFP_NOFS
);
1350 btrfs_start_ordered_extent(inode
, ordered
, 1);
1354 btrfs_set_extent_delalloc(inode
, page_start
, page_end
);
1355 ClearPageChecked(page
);
1357 unlock_extent(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
, GFP_NOFS
);
1360 page_cache_release(page
);
1364 * There are a few paths in the higher layers of the kernel that directly
1365 * set the page dirty bit without asking the filesystem if it is a
1366 * good idea. This causes problems because we want to make sure COW
1367 * properly happens and the data=ordered rules are followed.
1369 * In our case any range that doesn't have the ORDERED bit set
1370 * hasn't been properly setup for IO. We kick off an async process
1371 * to fix it up. The async helper will wait for ordered extents, set
1372 * the delalloc bit and make it safe to write the page.
1374 static int btrfs_writepage_start_hook(struct page
*page
, u64 start
, u64 end
)
1376 struct inode
*inode
= page
->mapping
->host
;
1377 struct btrfs_writepage_fixup
*fixup
;
1378 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1381 ret
= test_range_bit(&BTRFS_I(inode
)->io_tree
, start
, end
,
1386 if (PageChecked(page
))
1389 fixup
= kzalloc(sizeof(*fixup
), GFP_NOFS
);
1393 SetPageChecked(page
);
1394 page_cache_get(page
);
1395 fixup
->work
.func
= btrfs_writepage_fixup_worker
;
1397 btrfs_queue_worker(&root
->fs_info
->fixup_workers
, &fixup
->work
);
1401 static int insert_reserved_file_extent(struct btrfs_trans_handle
*trans
,
1402 struct inode
*inode
, u64 file_pos
,
1403 u64 disk_bytenr
, u64 disk_num_bytes
,
1404 u64 num_bytes
, u64 ram_bytes
,
1405 u8 compression
, u8 encryption
,
1406 u16 other_encoding
, int extent_type
)
1408 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1409 struct btrfs_file_extent_item
*fi
;
1410 struct btrfs_path
*path
;
1411 struct extent_buffer
*leaf
;
1412 struct btrfs_key ins
;
1416 path
= btrfs_alloc_path();
1419 ret
= btrfs_drop_extents(trans
, root
, inode
, file_pos
,
1420 file_pos
+ num_bytes
, file_pos
, &hint
);
1423 ins
.objectid
= inode
->i_ino
;
1424 ins
.offset
= file_pos
;
1425 ins
.type
= BTRFS_EXTENT_DATA_KEY
;
1426 ret
= btrfs_insert_empty_item(trans
, root
, path
, &ins
, sizeof(*fi
));
1428 leaf
= path
->nodes
[0];
1429 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
1430 struct btrfs_file_extent_item
);
1431 btrfs_set_file_extent_generation(leaf
, fi
, trans
->transid
);
1432 btrfs_set_file_extent_type(leaf
, fi
, extent_type
);
1433 btrfs_set_file_extent_disk_bytenr(leaf
, fi
, disk_bytenr
);
1434 btrfs_set_file_extent_disk_num_bytes(leaf
, fi
, disk_num_bytes
);
1435 btrfs_set_file_extent_offset(leaf
, fi
, 0);
1436 btrfs_set_file_extent_num_bytes(leaf
, fi
, num_bytes
);
1437 btrfs_set_file_extent_ram_bytes(leaf
, fi
, ram_bytes
);
1438 btrfs_set_file_extent_compression(leaf
, fi
, compression
);
1439 btrfs_set_file_extent_encryption(leaf
, fi
, encryption
);
1440 btrfs_set_file_extent_other_encoding(leaf
, fi
, other_encoding
);
1441 btrfs_mark_buffer_dirty(leaf
);
1443 inode_add_bytes(inode
, num_bytes
);
1444 btrfs_drop_extent_cache(inode
, file_pos
, file_pos
+ num_bytes
- 1, 0);
1446 ins
.objectid
= disk_bytenr
;
1447 ins
.offset
= disk_num_bytes
;
1448 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
1449 ret
= btrfs_alloc_reserved_extent(trans
, root
, leaf
->start
,
1450 root
->root_key
.objectid
,
1451 trans
->transid
, inode
->i_ino
, &ins
);
1454 btrfs_free_path(path
);
1458 /* as ordered data IO finishes, this gets called so we can finish
1459 * an ordered extent if the range of bytes in the file it covers are
1462 static int btrfs_finish_ordered_io(struct inode
*inode
, u64 start
, u64 end
)
1464 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1465 struct btrfs_trans_handle
*trans
;
1466 struct btrfs_ordered_extent
*ordered_extent
;
1467 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1471 ret
= btrfs_dec_test_ordered_pending(inode
, start
, end
- start
+ 1);
1475 trans
= btrfs_join_transaction(root
, 1);
1477 ordered_extent
= btrfs_lookup_ordered_extent(inode
, start
);
1478 BUG_ON(!ordered_extent
);
1479 if (test_bit(BTRFS_ORDERED_NOCOW
, &ordered_extent
->flags
))
1482 lock_extent(io_tree
, ordered_extent
->file_offset
,
1483 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
1486 if (test_bit(BTRFS_ORDERED_COMPRESSED
, &ordered_extent
->flags
))
1488 if (test_bit(BTRFS_ORDERED_PREALLOC
, &ordered_extent
->flags
)) {
1490 ret
= btrfs_mark_extent_written(trans
, root
, inode
,
1491 ordered_extent
->file_offset
,
1492 ordered_extent
->file_offset
+
1493 ordered_extent
->len
);
1496 ret
= insert_reserved_file_extent(trans
, inode
,
1497 ordered_extent
->file_offset
,
1498 ordered_extent
->start
,
1499 ordered_extent
->disk_len
,
1500 ordered_extent
->len
,
1501 ordered_extent
->len
,
1503 BTRFS_FILE_EXTENT_REG
);
1506 unlock_extent(io_tree
, ordered_extent
->file_offset
,
1507 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
1510 add_pending_csums(trans
, inode
, ordered_extent
->file_offset
,
1511 &ordered_extent
->list
);
1513 mutex_lock(&BTRFS_I(inode
)->extent_mutex
);
1514 btrfs_ordered_update_i_size(inode
, ordered_extent
);
1515 btrfs_update_inode(trans
, root
, inode
);
1516 btrfs_remove_ordered_extent(inode
, ordered_extent
);
1517 mutex_unlock(&BTRFS_I(inode
)->extent_mutex
);
1520 btrfs_put_ordered_extent(ordered_extent
);
1521 /* once for the tree */
1522 btrfs_put_ordered_extent(ordered_extent
);
1524 btrfs_end_transaction(trans
, root
);
1528 static int btrfs_writepage_end_io_hook(struct page
*page
, u64 start
, u64 end
,
1529 struct extent_state
*state
, int uptodate
)
1531 return btrfs_finish_ordered_io(page
->mapping
->host
, start
, end
);
1535 * When IO fails, either with EIO or csum verification fails, we
1536 * try other mirrors that might have a good copy of the data. This
1537 * io_failure_record is used to record state as we go through all the
1538 * mirrors. If another mirror has good data, the page is set up to date
1539 * and things continue. If a good mirror can't be found, the original
1540 * bio end_io callback is called to indicate things have failed.
1542 struct io_failure_record
{
1547 unsigned long bio_flags
;
1551 static int btrfs_io_failed_hook(struct bio
*failed_bio
,
1552 struct page
*page
, u64 start
, u64 end
,
1553 struct extent_state
*state
)
1555 struct io_failure_record
*failrec
= NULL
;
1557 struct extent_map
*em
;
1558 struct inode
*inode
= page
->mapping
->host
;
1559 struct extent_io_tree
*failure_tree
= &BTRFS_I(inode
)->io_failure_tree
;
1560 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1567 ret
= get_state_private(failure_tree
, start
, &private);
1569 failrec
= kmalloc(sizeof(*failrec
), GFP_NOFS
);
1572 failrec
->start
= start
;
1573 failrec
->len
= end
- start
+ 1;
1574 failrec
->last_mirror
= 0;
1575 failrec
->bio_flags
= 0;
1577 spin_lock(&em_tree
->lock
);
1578 em
= lookup_extent_mapping(em_tree
, start
, failrec
->len
);
1579 if (em
->start
> start
|| em
->start
+ em
->len
< start
) {
1580 free_extent_map(em
);
1583 spin_unlock(&em_tree
->lock
);
1585 if (!em
|| IS_ERR(em
)) {
1589 logical
= start
- em
->start
;
1590 logical
= em
->block_start
+ logical
;
1591 if (test_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
)) {
1592 logical
= em
->block_start
;
1593 failrec
->bio_flags
= EXTENT_BIO_COMPRESSED
;
1595 failrec
->logical
= logical
;
1596 free_extent_map(em
);
1597 set_extent_bits(failure_tree
, start
, end
, EXTENT_LOCKED
|
1598 EXTENT_DIRTY
, GFP_NOFS
);
1599 set_state_private(failure_tree
, start
,
1600 (u64
)(unsigned long)failrec
);
1602 failrec
= (struct io_failure_record
*)(unsigned long)private;
1604 num_copies
= btrfs_num_copies(
1605 &BTRFS_I(inode
)->root
->fs_info
->mapping_tree
,
1606 failrec
->logical
, failrec
->len
);
1607 failrec
->last_mirror
++;
1609 spin_lock_irq(&BTRFS_I(inode
)->io_tree
.lock
);
1610 state
= find_first_extent_bit_state(&BTRFS_I(inode
)->io_tree
,
1613 if (state
&& state
->start
!= failrec
->start
)
1615 spin_unlock_irq(&BTRFS_I(inode
)->io_tree
.lock
);
1617 if (!state
|| failrec
->last_mirror
> num_copies
) {
1618 set_state_private(failure_tree
, failrec
->start
, 0);
1619 clear_extent_bits(failure_tree
, failrec
->start
,
1620 failrec
->start
+ failrec
->len
- 1,
1621 EXTENT_LOCKED
| EXTENT_DIRTY
, GFP_NOFS
);
1625 bio
= bio_alloc(GFP_NOFS
, 1);
1626 bio
->bi_private
= state
;
1627 bio
->bi_end_io
= failed_bio
->bi_end_io
;
1628 bio
->bi_sector
= failrec
->logical
>> 9;
1629 bio
->bi_bdev
= failed_bio
->bi_bdev
;
1632 bio_add_page(bio
, page
, failrec
->len
, start
- page_offset(page
));
1633 if (failed_bio
->bi_rw
& (1 << BIO_RW
))
1638 BTRFS_I(inode
)->io_tree
.ops
->submit_bio_hook(inode
, rw
, bio
,
1639 failrec
->last_mirror
,
1640 failrec
->bio_flags
);
1645 * each time an IO finishes, we do a fast check in the IO failure tree
1646 * to see if we need to process or clean up an io_failure_record
1648 static int btrfs_clean_io_failures(struct inode
*inode
, u64 start
)
1651 u64 private_failure
;
1652 struct io_failure_record
*failure
;
1656 if (count_range_bits(&BTRFS_I(inode
)->io_failure_tree
, &private,
1657 (u64
)-1, 1, EXTENT_DIRTY
)) {
1658 ret
= get_state_private(&BTRFS_I(inode
)->io_failure_tree
,
1659 start
, &private_failure
);
1661 failure
= (struct io_failure_record
*)(unsigned long)
1663 set_state_private(&BTRFS_I(inode
)->io_failure_tree
,
1665 clear_extent_bits(&BTRFS_I(inode
)->io_failure_tree
,
1667 failure
->start
+ failure
->len
- 1,
1668 EXTENT_DIRTY
| EXTENT_LOCKED
,
1677 * when reads are done, we need to check csums to verify the data is correct
1678 * if there's a match, we allow the bio to finish. If not, we go through
1679 * the io_failure_record routines to find good copies
1681 static int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
,
1682 struct extent_state
*state
)
1684 size_t offset
= start
- ((u64
)page
->index
<< PAGE_CACHE_SHIFT
);
1685 struct inode
*inode
= page
->mapping
->host
;
1686 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1688 u64
private = ~(u32
)0;
1690 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1692 unsigned long flags
;
1694 if (PageChecked(page
)) {
1695 ClearPageChecked(page
);
1698 if (btrfs_test_opt(root
, NODATASUM
) ||
1699 btrfs_test_flag(inode
, NODATASUM
))
1702 if (state
&& state
->start
== start
) {
1703 private = state
->private;
1706 ret
= get_state_private(io_tree
, start
, &private);
1708 local_irq_save(flags
);
1709 kaddr
= kmap_atomic(page
, KM_IRQ0
);
1713 csum
= btrfs_csum_data(root
, kaddr
+ offset
, csum
, end
- start
+ 1);
1714 btrfs_csum_final(csum
, (char *)&csum
);
1715 if (csum
!= private) {
1718 kunmap_atomic(kaddr
, KM_IRQ0
);
1719 local_irq_restore(flags
);
1721 /* if the io failure tree for this inode is non-empty,
1722 * check to see if we've recovered from a failed IO
1724 btrfs_clean_io_failures(inode
, start
);
1728 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
1729 page
->mapping
->host
->i_ino
, (unsigned long long)start
, csum
,
1731 memset(kaddr
+ offset
, 1, end
- start
+ 1);
1732 flush_dcache_page(page
);
1733 kunmap_atomic(kaddr
, KM_IRQ0
);
1734 local_irq_restore(flags
);
1741 * This creates an orphan entry for the given inode in case something goes
1742 * wrong in the middle of an unlink/truncate.
1744 int btrfs_orphan_add(struct btrfs_trans_handle
*trans
, struct inode
*inode
)
1746 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1749 spin_lock(&root
->list_lock
);
1751 /* already on the orphan list, we're good */
1752 if (!list_empty(&BTRFS_I(inode
)->i_orphan
)) {
1753 spin_unlock(&root
->list_lock
);
1757 list_add(&BTRFS_I(inode
)->i_orphan
, &root
->orphan_list
);
1759 spin_unlock(&root
->list_lock
);
1762 * insert an orphan item to track this unlinked/truncated file
1764 ret
= btrfs_insert_orphan_item(trans
, root
, inode
->i_ino
);
1770 * We have done the truncate/delete so we can go ahead and remove the orphan
1771 * item for this particular inode.
1773 int btrfs_orphan_del(struct btrfs_trans_handle
*trans
, struct inode
*inode
)
1775 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1778 spin_lock(&root
->list_lock
);
1780 if (list_empty(&BTRFS_I(inode
)->i_orphan
)) {
1781 spin_unlock(&root
->list_lock
);
1785 list_del_init(&BTRFS_I(inode
)->i_orphan
);
1787 spin_unlock(&root
->list_lock
);
1791 spin_unlock(&root
->list_lock
);
1793 ret
= btrfs_del_orphan_item(trans
, root
, inode
->i_ino
);
1799 * this cleans up any orphans that may be left on the list from the last use
1802 void btrfs_orphan_cleanup(struct btrfs_root
*root
)
1804 struct btrfs_path
*path
;
1805 struct extent_buffer
*leaf
;
1806 struct btrfs_item
*item
;
1807 struct btrfs_key key
, found_key
;
1808 struct btrfs_trans_handle
*trans
;
1809 struct inode
*inode
;
1810 int ret
= 0, nr_unlink
= 0, nr_truncate
= 0;
1812 path
= btrfs_alloc_path();
1817 key
.objectid
= BTRFS_ORPHAN_OBJECTID
;
1818 btrfs_set_key_type(&key
, BTRFS_ORPHAN_ITEM_KEY
);
1819 key
.offset
= (u64
)-1;
1823 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1825 printk(KERN_ERR
"Error searching slot for orphan: %d"
1831 * if ret == 0 means we found what we were searching for, which
1832 * is weird, but possible, so only screw with path if we didnt
1833 * find the key and see if we have stuff that matches
1836 if (path
->slots
[0] == 0)
1841 /* pull out the item */
1842 leaf
= path
->nodes
[0];
1843 item
= btrfs_item_nr(leaf
, path
->slots
[0]);
1844 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1846 /* make sure the item matches what we want */
1847 if (found_key
.objectid
!= BTRFS_ORPHAN_OBJECTID
)
1849 if (btrfs_key_type(&found_key
) != BTRFS_ORPHAN_ITEM_KEY
)
1852 /* release the path since we're done with it */
1853 btrfs_release_path(root
, path
);
1856 * this is where we are basically btrfs_lookup, without the
1857 * crossing root thing. we store the inode number in the
1858 * offset of the orphan item.
1860 inode
= btrfs_iget_locked(root
->fs_info
->sb
,
1861 found_key
.offset
, root
);
1865 if (inode
->i_state
& I_NEW
) {
1866 BTRFS_I(inode
)->root
= root
;
1868 /* have to set the location manually */
1869 BTRFS_I(inode
)->location
.objectid
= inode
->i_ino
;
1870 BTRFS_I(inode
)->location
.type
= BTRFS_INODE_ITEM_KEY
;
1871 BTRFS_I(inode
)->location
.offset
= 0;
1873 btrfs_read_locked_inode(inode
);
1874 unlock_new_inode(inode
);
1878 * add this inode to the orphan list so btrfs_orphan_del does
1879 * the proper thing when we hit it
1881 spin_lock(&root
->list_lock
);
1882 list_add(&BTRFS_I(inode
)->i_orphan
, &root
->orphan_list
);
1883 spin_unlock(&root
->list_lock
);
1886 * if this is a bad inode, means we actually succeeded in
1887 * removing the inode, but not the orphan record, which means
1888 * we need to manually delete the orphan since iput will just
1889 * do a destroy_inode
1891 if (is_bad_inode(inode
)) {
1892 trans
= btrfs_start_transaction(root
, 1);
1893 btrfs_orphan_del(trans
, inode
);
1894 btrfs_end_transaction(trans
, root
);
1899 /* if we have links, this was a truncate, lets do that */
1900 if (inode
->i_nlink
) {
1902 btrfs_truncate(inode
);
1907 /* this will do delete_inode and everything for us */
1912 printk(KERN_INFO
"btrfs: unlinked %d orphans\n", nr_unlink
);
1914 printk(KERN_INFO
"btrfs: truncated %d orphans\n", nr_truncate
);
1916 btrfs_free_path(path
);
1920 * read an inode from the btree into the in-memory inode
1922 void btrfs_read_locked_inode(struct inode
*inode
)
1924 struct btrfs_path
*path
;
1925 struct extent_buffer
*leaf
;
1926 struct btrfs_inode_item
*inode_item
;
1927 struct btrfs_timespec
*tspec
;
1928 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1929 struct btrfs_key location
;
1930 u64 alloc_group_block
;
1934 path
= btrfs_alloc_path();
1936 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
1938 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
1942 leaf
= path
->nodes
[0];
1943 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1944 struct btrfs_inode_item
);
1946 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
1947 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
1948 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
1949 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
1950 btrfs_i_size_write(inode
, btrfs_inode_size(leaf
, inode_item
));
1952 tspec
= btrfs_inode_atime(inode_item
);
1953 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
1954 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
1956 tspec
= btrfs_inode_mtime(inode_item
);
1957 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
1958 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
1960 tspec
= btrfs_inode_ctime(inode_item
);
1961 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
1962 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
1964 inode_set_bytes(inode
, btrfs_inode_nbytes(leaf
, inode_item
));
1965 BTRFS_I(inode
)->generation
= btrfs_inode_generation(leaf
, inode_item
);
1966 BTRFS_I(inode
)->sequence
= btrfs_inode_sequence(leaf
, inode_item
);
1967 inode
->i_generation
= BTRFS_I(inode
)->generation
;
1969 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
1971 BTRFS_I(inode
)->index_cnt
= (u64
)-1;
1973 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
1974 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
1976 BTRFS_I(inode
)->flags
= btrfs_inode_flags(leaf
, inode_item
);
1977 if (!BTRFS_I(inode
)->block_group
) {
1978 BTRFS_I(inode
)->block_group
= btrfs_find_block_group(root
,
1980 BTRFS_BLOCK_GROUP_METADATA
, 0);
1982 btrfs_free_path(path
);
1985 switch (inode
->i_mode
& S_IFMT
) {
1987 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1988 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
1989 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
1990 inode
->i_fop
= &btrfs_file_operations
;
1991 inode
->i_op
= &btrfs_file_inode_operations
;
1994 inode
->i_fop
= &btrfs_dir_file_operations
;
1995 if (root
== root
->fs_info
->tree_root
)
1996 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
1998 inode
->i_op
= &btrfs_dir_inode_operations
;
2001 inode
->i_op
= &btrfs_symlink_inode_operations
;
2002 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2003 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
2006 init_special_inode(inode
, inode
->i_mode
, rdev
);
2012 btrfs_free_path(path
);
2013 make_bad_inode(inode
);
2017 * given a leaf and an inode, copy the inode fields into the leaf
2019 static void fill_inode_item(struct btrfs_trans_handle
*trans
,
2020 struct extent_buffer
*leaf
,
2021 struct btrfs_inode_item
*item
,
2022 struct inode
*inode
)
2024 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
2025 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
2026 btrfs_set_inode_size(leaf
, item
, BTRFS_I(inode
)->disk_i_size
);
2027 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
2028 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
2030 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
2031 inode
->i_atime
.tv_sec
);
2032 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
2033 inode
->i_atime
.tv_nsec
);
2035 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
2036 inode
->i_mtime
.tv_sec
);
2037 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
2038 inode
->i_mtime
.tv_nsec
);
2040 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
2041 inode
->i_ctime
.tv_sec
);
2042 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
2043 inode
->i_ctime
.tv_nsec
);
2045 btrfs_set_inode_nbytes(leaf
, item
, inode_get_bytes(inode
));
2046 btrfs_set_inode_generation(leaf
, item
, BTRFS_I(inode
)->generation
);
2047 btrfs_set_inode_sequence(leaf
, item
, BTRFS_I(inode
)->sequence
);
2048 btrfs_set_inode_transid(leaf
, item
, trans
->transid
);
2049 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
2050 btrfs_set_inode_flags(leaf
, item
, BTRFS_I(inode
)->flags
);
2051 btrfs_set_inode_block_group(leaf
, item
,
2052 BTRFS_I(inode
)->block_group
->key
.objectid
);
2056 * copy everything in the in-memory inode into the btree.
2058 int noinline
btrfs_update_inode(struct btrfs_trans_handle
*trans
,
2059 struct btrfs_root
*root
,
2060 struct inode
*inode
)
2062 struct btrfs_inode_item
*inode_item
;
2063 struct btrfs_path
*path
;
2064 struct extent_buffer
*leaf
;
2067 path
= btrfs_alloc_path();
2069 ret
= btrfs_lookup_inode(trans
, root
, path
,
2070 &BTRFS_I(inode
)->location
, 1);
2077 leaf
= path
->nodes
[0];
2078 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2079 struct btrfs_inode_item
);
2081 fill_inode_item(trans
, leaf
, inode_item
, inode
);
2082 btrfs_mark_buffer_dirty(leaf
);
2083 btrfs_set_inode_last_trans(trans
, inode
);
2086 btrfs_free_path(path
);
2092 * unlink helper that gets used here in inode.c and in the tree logging
2093 * recovery code. It remove a link in a directory with a given name, and
2094 * also drops the back refs in the inode to the directory
2096 int btrfs_unlink_inode(struct btrfs_trans_handle
*trans
,
2097 struct btrfs_root
*root
,
2098 struct inode
*dir
, struct inode
*inode
,
2099 const char *name
, int name_len
)
2101 struct btrfs_path
*path
;
2103 struct extent_buffer
*leaf
;
2104 struct btrfs_dir_item
*di
;
2105 struct btrfs_key key
;
2108 path
= btrfs_alloc_path();
2114 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
2115 name
, name_len
, -1);
2124 leaf
= path
->nodes
[0];
2125 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
2126 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
2129 btrfs_release_path(root
, path
);
2131 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
2133 dir
->i_ino
, &index
);
2135 printk("failed to delete reference to %.*s, "
2136 "inode %lu parent %lu\n", name_len
, name
,
2137 inode
->i_ino
, dir
->i_ino
);
2141 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
2142 index
, name
, name_len
, -1);
2151 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
2152 btrfs_release_path(root
, path
);
2154 ret
= btrfs_del_inode_ref_in_log(trans
, root
, name
, name_len
,
2156 BUG_ON(ret
!= 0 && ret
!= -ENOENT
);
2158 BTRFS_I(dir
)->log_dirty_trans
= trans
->transid
;
2160 ret
= btrfs_del_dir_entries_in_log(trans
, root
, name
, name_len
,
2164 btrfs_free_path(path
);
2168 btrfs_i_size_write(dir
, dir
->i_size
- name_len
* 2);
2169 inode
->i_ctime
= dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
2170 btrfs_update_inode(trans
, root
, dir
);
2171 btrfs_drop_nlink(inode
);
2172 ret
= btrfs_update_inode(trans
, root
, inode
);
2173 dir
->i_sb
->s_dirt
= 1;
2178 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
2180 struct btrfs_root
*root
;
2181 struct btrfs_trans_handle
*trans
;
2182 struct inode
*inode
= dentry
->d_inode
;
2184 unsigned long nr
= 0;
2186 root
= BTRFS_I(dir
)->root
;
2188 ret
= btrfs_check_free_space(root
, 1, 1);
2192 trans
= btrfs_start_transaction(root
, 1);
2194 btrfs_set_trans_block_group(trans
, dir
);
2195 ret
= btrfs_unlink_inode(trans
, root
, dir
, dentry
->d_inode
,
2196 dentry
->d_name
.name
, dentry
->d_name
.len
);
2198 if (inode
->i_nlink
== 0)
2199 ret
= btrfs_orphan_add(trans
, inode
);
2201 nr
= trans
->blocks_used
;
2203 btrfs_end_transaction_throttle(trans
, root
);
2205 btrfs_btree_balance_dirty(root
, nr
);
2209 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
2211 struct inode
*inode
= dentry
->d_inode
;
2214 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2215 struct btrfs_trans_handle
*trans
;
2216 unsigned long nr
= 0;
2219 * the FIRST_FREE_OBJECTID check makes sure we don't try to rmdir
2220 * the root of a subvolume or snapshot
2222 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
||
2223 inode
->i_ino
== BTRFS_FIRST_FREE_OBJECTID
) {
2227 ret
= btrfs_check_free_space(root
, 1, 1);
2231 trans
= btrfs_start_transaction(root
, 1);
2232 btrfs_set_trans_block_group(trans
, dir
);
2234 err
= btrfs_orphan_add(trans
, inode
);
2238 /* now the directory is empty */
2239 err
= btrfs_unlink_inode(trans
, root
, dir
, dentry
->d_inode
,
2240 dentry
->d_name
.name
, dentry
->d_name
.len
);
2242 btrfs_i_size_write(inode
, 0);
2246 nr
= trans
->blocks_used
;
2247 ret
= btrfs_end_transaction_throttle(trans
, root
);
2249 btrfs_btree_balance_dirty(root
, nr
);
2258 * when truncating bytes in a file, it is possible to avoid reading
2259 * the leaves that contain only checksum items. This can be the
2260 * majority of the IO required to delete a large file, but it must
2261 * be done carefully.
2263 * The keys in the level just above the leaves are checked to make sure
2264 * the lowest key in a given leaf is a csum key, and starts at an offset
2265 * after the new size.
2267 * Then the key for the next leaf is checked to make sure it also has
2268 * a checksum item for the same file. If it does, we know our target leaf
2269 * contains only checksum items, and it can be safely freed without reading
2272 * This is just an optimization targeted at large files. It may do
2273 * nothing. It will return 0 unless things went badly.
2275 static noinline
int drop_csum_leaves(struct btrfs_trans_handle
*trans
,
2276 struct btrfs_root
*root
,
2277 struct btrfs_path
*path
,
2278 struct inode
*inode
, u64 new_size
)
2280 struct btrfs_key key
;
2283 struct btrfs_key found_key
;
2284 struct btrfs_key other_key
;
2285 struct btrfs_leaf_ref
*ref
;
2289 path
->lowest_level
= 1;
2290 key
.objectid
= inode
->i_ino
;
2291 key
.type
= BTRFS_CSUM_ITEM_KEY
;
2292 key
.offset
= new_size
;
2294 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
2298 if (path
->nodes
[1] == NULL
) {
2303 btrfs_node_key_to_cpu(path
->nodes
[1], &found_key
, path
->slots
[1]);
2304 nritems
= btrfs_header_nritems(path
->nodes
[1]);
2309 if (path
->slots
[1] >= nritems
)
2312 /* did we find a key greater than anything we want to delete? */
2313 if (found_key
.objectid
> inode
->i_ino
||
2314 (found_key
.objectid
== inode
->i_ino
&& found_key
.type
> key
.type
))
2317 /* we check the next key in the node to make sure the leave contains
2318 * only checksum items. This comparison doesn't work if our
2319 * leaf is the last one in the node
2321 if (path
->slots
[1] + 1 >= nritems
) {
2323 /* search forward from the last key in the node, this
2324 * will bring us into the next node in the tree
2326 btrfs_node_key_to_cpu(path
->nodes
[1], &found_key
, nritems
- 1);
2328 /* unlikely, but we inc below, so check to be safe */
2329 if (found_key
.offset
== (u64
)-1)
2332 /* search_forward needs a path with locks held, do the
2333 * search again for the original key. It is possible
2334 * this will race with a balance and return a path that
2335 * we could modify, but this drop is just an optimization
2336 * and is allowed to miss some leaves.
2338 btrfs_release_path(root
, path
);
2341 /* setup a max key for search_forward */
2342 other_key
.offset
= (u64
)-1;
2343 other_key
.type
= key
.type
;
2344 other_key
.objectid
= key
.objectid
;
2346 path
->keep_locks
= 1;
2347 ret
= btrfs_search_forward(root
, &found_key
, &other_key
,
2349 path
->keep_locks
= 0;
2350 if (ret
|| found_key
.objectid
!= key
.objectid
||
2351 found_key
.type
!= key
.type
) {
2356 key
.offset
= found_key
.offset
;
2357 btrfs_release_path(root
, path
);
2362 /* we know there's one more slot after us in the tree,
2363 * read that key so we can verify it is also a checksum item
2365 btrfs_node_key_to_cpu(path
->nodes
[1], &other_key
, path
->slots
[1] + 1);
2367 if (found_key
.objectid
< inode
->i_ino
)
2370 if (found_key
.type
!= key
.type
|| found_key
.offset
< new_size
)
2374 * if the key for the next leaf isn't a csum key from this objectid,
2375 * we can't be sure there aren't good items inside this leaf.
2378 if (other_key
.objectid
!= inode
->i_ino
|| other_key
.type
!= key
.type
)
2381 leaf_start
= btrfs_node_blockptr(path
->nodes
[1], path
->slots
[1]);
2382 leaf_gen
= btrfs_node_ptr_generation(path
->nodes
[1], path
->slots
[1]);
2384 * it is safe to delete this leaf, it contains only
2385 * csum items from this inode at an offset >= new_size
2387 ret
= btrfs_del_leaf(trans
, root
, path
, leaf_start
);
2390 if (root
->ref_cows
&& leaf_gen
< trans
->transid
) {
2391 ref
= btrfs_alloc_leaf_ref(root
, 0);
2393 ref
->root_gen
= root
->root_key
.offset
;
2394 ref
->bytenr
= leaf_start
;
2396 ref
->generation
= leaf_gen
;
2399 ret
= btrfs_add_leaf_ref(root
, ref
, 0);
2401 btrfs_free_leaf_ref(root
, ref
);
2407 btrfs_release_path(root
, path
);
2409 if (other_key
.objectid
== inode
->i_ino
&&
2410 other_key
.type
== key
.type
&& other_key
.offset
> key
.offset
) {
2411 key
.offset
= other_key
.offset
;
2417 /* fixup any changes we've made to the path */
2418 path
->lowest_level
= 0;
2419 path
->keep_locks
= 0;
2420 btrfs_release_path(root
, path
);
2427 * this can truncate away extent items, csum items and directory items.
2428 * It starts at a high offset and removes keys until it can't find
2429 * any higher than new_size
2431 * csum items that cross the new i_size are truncated to the new size
2434 * min_type is the minimum key type to truncate down to. If set to 0, this
2435 * will kill all the items on this inode, including the INODE_ITEM_KEY.
2437 noinline
int btrfs_truncate_inode_items(struct btrfs_trans_handle
*trans
,
2438 struct btrfs_root
*root
,
2439 struct inode
*inode
,
2440 u64 new_size
, u32 min_type
)
2443 struct btrfs_path
*path
;
2444 struct btrfs_key key
;
2445 struct btrfs_key found_key
;
2447 struct extent_buffer
*leaf
;
2448 struct btrfs_file_extent_item
*fi
;
2449 u64 extent_start
= 0;
2450 u64 extent_num_bytes
= 0;
2456 int pending_del_nr
= 0;
2457 int pending_del_slot
= 0;
2458 int extent_type
= -1;
2460 u64 mask
= root
->sectorsize
- 1;
2463 btrfs_drop_extent_cache(inode
, new_size
& (~mask
), (u64
)-1, 0);
2464 path
= btrfs_alloc_path();
2468 /* FIXME, add redo link to tree so we don't leak on crash */
2469 key
.objectid
= inode
->i_ino
;
2470 key
.offset
= (u64
)-1;
2473 btrfs_init_path(path
);
2476 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
2481 /* there are no items in the tree for us to truncate, we're
2484 if (path
->slots
[0] == 0) {
2493 leaf
= path
->nodes
[0];
2494 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
2495 found_type
= btrfs_key_type(&found_key
);
2498 if (found_key
.objectid
!= inode
->i_ino
)
2501 if (found_type
< min_type
)
2504 item_end
= found_key
.offset
;
2505 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
2506 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
2507 struct btrfs_file_extent_item
);
2508 extent_type
= btrfs_file_extent_type(leaf
, fi
);
2509 encoding
= btrfs_file_extent_compression(leaf
, fi
);
2510 encoding
|= btrfs_file_extent_encryption(leaf
, fi
);
2511 encoding
|= btrfs_file_extent_other_encoding(leaf
, fi
);
2513 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
2515 btrfs_file_extent_num_bytes(leaf
, fi
);
2516 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
2517 item_end
+= btrfs_file_extent_inline_len(leaf
,
2522 if (item_end
< new_size
) {
2523 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
2524 found_type
= BTRFS_INODE_ITEM_KEY
;
2525 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
2526 found_type
= BTRFS_EXTENT_DATA_KEY
;
2527 } else if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
2528 found_type
= BTRFS_XATTR_ITEM_KEY
;
2529 } else if (found_type
== BTRFS_XATTR_ITEM_KEY
) {
2530 found_type
= BTRFS_INODE_REF_KEY
;
2531 } else if (found_type
) {
2536 btrfs_set_key_type(&key
, found_type
);
2539 if (found_key
.offset
>= new_size
)
2545 /* FIXME, shrink the extent if the ref count is only 1 */
2546 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
2549 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
2551 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
2552 if (!del_item
&& !encoding
) {
2553 u64 orig_num_bytes
=
2554 btrfs_file_extent_num_bytes(leaf
, fi
);
2555 extent_num_bytes
= new_size
-
2556 found_key
.offset
+ root
->sectorsize
- 1;
2557 extent_num_bytes
= extent_num_bytes
&
2558 ~((u64
)root
->sectorsize
- 1);
2559 btrfs_set_file_extent_num_bytes(leaf
, fi
,
2561 num_dec
= (orig_num_bytes
-
2563 if (root
->ref_cows
&& extent_start
!= 0)
2564 inode_sub_bytes(inode
, num_dec
);
2565 btrfs_mark_buffer_dirty(leaf
);
2568 btrfs_file_extent_disk_num_bytes(leaf
,
2570 /* FIXME blocksize != 4096 */
2571 num_dec
= btrfs_file_extent_num_bytes(leaf
, fi
);
2572 if (extent_start
!= 0) {
2575 inode_sub_bytes(inode
, num_dec
);
2577 root_gen
= btrfs_header_generation(leaf
);
2578 root_owner
= btrfs_header_owner(leaf
);
2580 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
2582 * we can't truncate inline items that have had
2586 btrfs_file_extent_compression(leaf
, fi
) == 0 &&
2587 btrfs_file_extent_encryption(leaf
, fi
) == 0 &&
2588 btrfs_file_extent_other_encoding(leaf
, fi
) == 0) {
2589 u32 size
= new_size
- found_key
.offset
;
2591 if (root
->ref_cows
) {
2592 inode_sub_bytes(inode
, item_end
+ 1 -
2596 btrfs_file_extent_calc_inline_size(size
);
2597 ret
= btrfs_truncate_item(trans
, root
, path
,
2600 } else if (root
->ref_cows
) {
2601 inode_sub_bytes(inode
, item_end
+ 1 -
2607 if (!pending_del_nr
) {
2608 /* no pending yet, add ourselves */
2609 pending_del_slot
= path
->slots
[0];
2611 } else if (pending_del_nr
&&
2612 path
->slots
[0] + 1 == pending_del_slot
) {
2613 /* hop on the pending chunk */
2615 pending_del_slot
= path
->slots
[0];
2617 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path
->slots
[0], pending_del_nr
, pending_del_slot
);
2623 ret
= btrfs_free_extent(trans
, root
, extent_start
,
2625 leaf
->start
, root_owner
,
2626 root_gen
, inode
->i_ino
, 0);
2630 if (path
->slots
[0] == 0) {
2633 btrfs_release_path(root
, path
);
2638 if (pending_del_nr
&&
2639 path
->slots
[0] + 1 != pending_del_slot
) {
2640 struct btrfs_key debug
;
2642 btrfs_item_key_to_cpu(path
->nodes
[0], &debug
,
2644 ret
= btrfs_del_items(trans
, root
, path
,
2649 btrfs_release_path(root
, path
);
2655 if (pending_del_nr
) {
2656 ret
= btrfs_del_items(trans
, root
, path
, pending_del_slot
,
2659 btrfs_free_path(path
);
2660 inode
->i_sb
->s_dirt
= 1;
2665 * taken from block_truncate_page, but does cow as it zeros out
2666 * any bytes left in the last page in the file.
2668 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
2670 struct inode
*inode
= mapping
->host
;
2671 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2672 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2673 struct btrfs_ordered_extent
*ordered
;
2675 u32 blocksize
= root
->sectorsize
;
2676 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
2677 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
2683 if ((offset
& (blocksize
- 1)) == 0)
2688 page
= grab_cache_page(mapping
, index
);
2692 page_start
= page_offset(page
);
2693 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2695 if (!PageUptodate(page
)) {
2696 ret
= btrfs_readpage(NULL
, page
);
2698 if (page
->mapping
!= mapping
) {
2700 page_cache_release(page
);
2703 if (!PageUptodate(page
)) {
2708 wait_on_page_writeback(page
);
2710 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2711 set_page_extent_mapped(page
);
2713 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
2715 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2717 page_cache_release(page
);
2718 btrfs_start_ordered_extent(inode
, ordered
, 1);
2719 btrfs_put_ordered_extent(ordered
);
2723 btrfs_set_extent_delalloc(inode
, page_start
, page_end
);
2725 if (offset
!= PAGE_CACHE_SIZE
) {
2727 memset(kaddr
+ offset
, 0, PAGE_CACHE_SIZE
- offset
);
2728 flush_dcache_page(page
);
2731 ClearPageChecked(page
);
2732 set_page_dirty(page
);
2733 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2737 page_cache_release(page
);
2742 int btrfs_cont_expand(struct inode
*inode
, loff_t size
)
2744 struct btrfs_trans_handle
*trans
;
2745 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2746 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2747 struct extent_map
*em
;
2748 u64 mask
= root
->sectorsize
- 1;
2749 u64 hole_start
= (inode
->i_size
+ mask
) & ~mask
;
2750 u64 block_end
= (size
+ mask
) & ~mask
;
2756 if (size
<= hole_start
)
2759 err
= btrfs_check_free_space(root
, 1, 0);
2763 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
2766 struct btrfs_ordered_extent
*ordered
;
2767 btrfs_wait_ordered_range(inode
, hole_start
,
2768 block_end
- hole_start
);
2769 lock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
2770 ordered
= btrfs_lookup_ordered_extent(inode
, hole_start
);
2773 unlock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
2774 btrfs_put_ordered_extent(ordered
);
2777 trans
= btrfs_start_transaction(root
, 1);
2778 btrfs_set_trans_block_group(trans
, inode
);
2780 cur_offset
= hole_start
;
2782 em
= btrfs_get_extent(inode
, NULL
, 0, cur_offset
,
2783 block_end
- cur_offset
, 0);
2784 BUG_ON(IS_ERR(em
) || !em
);
2785 last_byte
= min(extent_map_end(em
), block_end
);
2786 last_byte
= (last_byte
+ mask
) & ~mask
;
2787 if (test_bit(EXTENT_FLAG_VACANCY
, &em
->flags
)) {
2789 hole_size
= last_byte
- cur_offset
;
2790 err
= btrfs_drop_extents(trans
, root
, inode
,
2792 cur_offset
+ hole_size
,
2793 cur_offset
, &hint_byte
);
2796 err
= btrfs_insert_file_extent(trans
, root
,
2797 inode
->i_ino
, cur_offset
, 0,
2798 0, hole_size
, 0, hole_size
,
2800 btrfs_drop_extent_cache(inode
, hole_start
,
2803 free_extent_map(em
);
2804 cur_offset
= last_byte
;
2805 if (err
|| cur_offset
>= block_end
)
2809 btrfs_end_transaction(trans
, root
);
2810 unlock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
2814 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
2816 struct inode
*inode
= dentry
->d_inode
;
2819 err
= inode_change_ok(inode
, attr
);
2823 if (S_ISREG(inode
->i_mode
) &&
2824 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
2825 err
= btrfs_cont_expand(inode
, attr
->ia_size
);
2830 err
= inode_setattr(inode
, attr
);
2832 if (!err
&& ((attr
->ia_valid
& ATTR_MODE
)))
2833 err
= btrfs_acl_chmod(inode
);
2837 void btrfs_delete_inode(struct inode
*inode
)
2839 struct btrfs_trans_handle
*trans
;
2840 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2844 truncate_inode_pages(&inode
->i_data
, 0);
2845 if (is_bad_inode(inode
)) {
2846 btrfs_orphan_del(NULL
, inode
);
2849 btrfs_wait_ordered_range(inode
, 0, (u64
)-1);
2851 btrfs_i_size_write(inode
, 0);
2852 trans
= btrfs_start_transaction(root
, 1);
2854 btrfs_set_trans_block_group(trans
, inode
);
2855 ret
= btrfs_truncate_inode_items(trans
, root
, inode
, inode
->i_size
, 0);
2857 btrfs_orphan_del(NULL
, inode
);
2858 goto no_delete_lock
;
2861 btrfs_orphan_del(trans
, inode
);
2863 nr
= trans
->blocks_used
;
2866 btrfs_end_transaction(trans
, root
);
2867 btrfs_btree_balance_dirty(root
, nr
);
2871 nr
= trans
->blocks_used
;
2872 btrfs_end_transaction(trans
, root
);
2873 btrfs_btree_balance_dirty(root
, nr
);
2879 * this returns the key found in the dir entry in the location pointer.
2880 * If no dir entries were found, location->objectid is 0.
2882 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
2883 struct btrfs_key
*location
)
2885 const char *name
= dentry
->d_name
.name
;
2886 int namelen
= dentry
->d_name
.len
;
2887 struct btrfs_dir_item
*di
;
2888 struct btrfs_path
*path
;
2889 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2892 path
= btrfs_alloc_path();
2895 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
2899 if (!di
|| IS_ERR(di
)) {
2902 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
2904 btrfs_free_path(path
);
2907 location
->objectid
= 0;
2912 * when we hit a tree root in a directory, the btrfs part of the inode
2913 * needs to be changed to reflect the root directory of the tree root. This
2914 * is kind of like crossing a mount point.
2916 static int fixup_tree_root_location(struct btrfs_root
*root
,
2917 struct btrfs_key
*location
,
2918 struct btrfs_root
**sub_root
,
2919 struct dentry
*dentry
)
2921 struct btrfs_root_item
*ri
;
2923 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
2925 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
2928 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
2929 dentry
->d_name
.name
,
2930 dentry
->d_name
.len
);
2931 if (IS_ERR(*sub_root
))
2932 return PTR_ERR(*sub_root
);
2934 ri
= &(*sub_root
)->root_item
;
2935 location
->objectid
= btrfs_root_dirid(ri
);
2936 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
2937 location
->offset
= 0;
2942 static noinline
void init_btrfs_i(struct inode
*inode
)
2944 struct btrfs_inode
*bi
= BTRFS_I(inode
);
2947 bi
->i_default_acl
= NULL
;
2952 bi
->logged_trans
= 0;
2953 bi
->delalloc_bytes
= 0;
2954 bi
->disk_i_size
= 0;
2956 bi
->index_cnt
= (u64
)-1;
2957 bi
->log_dirty_trans
= 0;
2958 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
2959 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
2960 inode
->i_mapping
, GFP_NOFS
);
2961 extent_io_tree_init(&BTRFS_I(inode
)->io_failure_tree
,
2962 inode
->i_mapping
, GFP_NOFS
);
2963 INIT_LIST_HEAD(&BTRFS_I(inode
)->delalloc_inodes
);
2964 btrfs_ordered_inode_tree_init(&BTRFS_I(inode
)->ordered_tree
);
2965 mutex_init(&BTRFS_I(inode
)->extent_mutex
);
2966 mutex_init(&BTRFS_I(inode
)->log_mutex
);
2969 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
2971 struct btrfs_iget_args
*args
= p
;
2972 inode
->i_ino
= args
->ino
;
2973 init_btrfs_i(inode
);
2974 BTRFS_I(inode
)->root
= args
->root
;
2978 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
2980 struct btrfs_iget_args
*args
= opaque
;
2981 return (args
->ino
== inode
->i_ino
&&
2982 args
->root
== BTRFS_I(inode
)->root
);
2985 struct inode
*btrfs_ilookup(struct super_block
*s
, u64 objectid
,
2986 struct btrfs_root
*root
, int wait
)
2988 struct inode
*inode
;
2989 struct btrfs_iget_args args
;
2990 args
.ino
= objectid
;
2994 inode
= ilookup5(s
, objectid
, btrfs_find_actor
,
2997 inode
= ilookup5_nowait(s
, objectid
, btrfs_find_actor
,
3003 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
3004 struct btrfs_root
*root
)
3006 struct inode
*inode
;
3007 struct btrfs_iget_args args
;
3008 args
.ino
= objectid
;
3011 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
3012 btrfs_init_locked_inode
,
3017 /* Get an inode object given its location and corresponding root.
3018 * Returns in *is_new if the inode was read from disk
3020 struct inode
*btrfs_iget(struct super_block
*s
, struct btrfs_key
*location
,
3021 struct btrfs_root
*root
, int *is_new
)
3023 struct inode
*inode
;
3025 inode
= btrfs_iget_locked(s
, location
->objectid
, root
);
3027 return ERR_PTR(-EACCES
);
3029 if (inode
->i_state
& I_NEW
) {
3030 BTRFS_I(inode
)->root
= root
;
3031 memcpy(&BTRFS_I(inode
)->location
, location
, sizeof(*location
));
3032 btrfs_read_locked_inode(inode
);
3033 unlock_new_inode(inode
);
3044 struct inode
*btrfs_lookup_dentry(struct inode
*dir
, struct dentry
*dentry
)
3046 struct inode
* inode
;
3047 struct btrfs_inode
*bi
= BTRFS_I(dir
);
3048 struct btrfs_root
*root
= bi
->root
;
3049 struct btrfs_root
*sub_root
= root
;
3050 struct btrfs_key location
;
3053 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
3054 return ERR_PTR(-ENAMETOOLONG
);
3056 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
3059 return ERR_PTR(ret
);
3062 if (location
.objectid
) {
3063 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
3066 return ERR_PTR(ret
);
3068 return ERR_PTR(-ENOENT
);
3069 inode
= btrfs_iget(dir
->i_sb
, &location
, sub_root
, &new);
3071 return ERR_CAST(inode
);
3076 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
3077 struct nameidata
*nd
)
3079 struct inode
*inode
;
3081 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
3082 return ERR_PTR(-ENAMETOOLONG
);
3084 inode
= btrfs_lookup_dentry(dir
, dentry
);
3086 return ERR_CAST(inode
);
3088 return d_splice_alias(inode
, dentry
);
3091 static unsigned char btrfs_filetype_table
[] = {
3092 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
3095 static int btrfs_real_readdir(struct file
*filp
, void *dirent
,
3098 struct inode
*inode
= filp
->f_dentry
->d_inode
;
3099 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3100 struct btrfs_item
*item
;
3101 struct btrfs_dir_item
*di
;
3102 struct btrfs_key key
;
3103 struct btrfs_key found_key
;
3104 struct btrfs_path
*path
;
3107 struct extent_buffer
*leaf
;
3110 unsigned char d_type
;
3115 int key_type
= BTRFS_DIR_INDEX_KEY
;
3120 /* FIXME, use a real flag for deciding about the key type */
3121 if (root
->fs_info
->tree_root
== root
)
3122 key_type
= BTRFS_DIR_ITEM_KEY
;
3124 /* special case for "." */
3125 if (filp
->f_pos
== 0) {
3126 over
= filldir(dirent
, ".", 1,
3133 /* special case for .., just use the back ref */
3134 if (filp
->f_pos
== 1) {
3135 u64 pino
= parent_ino(filp
->f_path
.dentry
);
3136 over
= filldir(dirent
, "..", 2,
3142 path
= btrfs_alloc_path();
3145 btrfs_set_key_type(&key
, key_type
);
3146 key
.offset
= filp
->f_pos
;
3147 key
.objectid
= inode
->i_ino
;
3149 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3155 leaf
= path
->nodes
[0];
3156 nritems
= btrfs_header_nritems(leaf
);
3157 slot
= path
->slots
[0];
3158 if (advance
|| slot
>= nritems
) {
3159 if (slot
>= nritems
- 1) {
3160 ret
= btrfs_next_leaf(root
, path
);
3163 leaf
= path
->nodes
[0];
3164 nritems
= btrfs_header_nritems(leaf
);
3165 slot
= path
->slots
[0];
3173 item
= btrfs_item_nr(leaf
, slot
);
3174 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
3176 if (found_key
.objectid
!= key
.objectid
)
3178 if (btrfs_key_type(&found_key
) != key_type
)
3180 if (found_key
.offset
< filp
->f_pos
)
3183 filp
->f_pos
= found_key
.offset
;
3185 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
3187 di_total
= btrfs_item_size(leaf
, item
);
3189 while (di_cur
< di_total
) {
3190 struct btrfs_key location
;
3192 name_len
= btrfs_dir_name_len(leaf
, di
);
3193 if (name_len
<= sizeof(tmp_name
)) {
3194 name_ptr
= tmp_name
;
3196 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
3202 read_extent_buffer(leaf
, name_ptr
,
3203 (unsigned long)(di
+ 1), name_len
);
3205 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
3206 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
3208 /* is this a reference to our own snapshot? If so
3211 if (location
.type
== BTRFS_ROOT_ITEM_KEY
&&
3212 location
.objectid
== root
->root_key
.objectid
) {
3216 over
= filldir(dirent
, name_ptr
, name_len
,
3217 found_key
.offset
, location
.objectid
,
3221 if (name_ptr
!= tmp_name
)
3226 di_len
= btrfs_dir_name_len(leaf
, di
) +
3227 btrfs_dir_data_len(leaf
, di
) + sizeof(*di
);
3229 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
3233 /* Reached end of directory/root. Bump pos past the last item. */
3234 if (key_type
== BTRFS_DIR_INDEX_KEY
)
3235 filp
->f_pos
= INT_LIMIT(typeof(filp
->f_pos
));
3241 btrfs_free_path(path
);
3245 int btrfs_write_inode(struct inode
*inode
, int wait
)
3247 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3248 struct btrfs_trans_handle
*trans
;
3251 if (root
->fs_info
->btree_inode
== inode
)
3255 trans
= btrfs_join_transaction(root
, 1);
3256 btrfs_set_trans_block_group(trans
, inode
);
3257 ret
= btrfs_commit_transaction(trans
, root
);
3263 * This is somewhat expensive, updating the tree every time the
3264 * inode changes. But, it is most likely to find the inode in cache.
3265 * FIXME, needs more benchmarking...there are no reasons other than performance
3266 * to keep or drop this code.
3268 void btrfs_dirty_inode(struct inode
*inode
)
3270 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3271 struct btrfs_trans_handle
*trans
;
3273 trans
= btrfs_join_transaction(root
, 1);
3274 btrfs_set_trans_block_group(trans
, inode
);
3275 btrfs_update_inode(trans
, root
, inode
);
3276 btrfs_end_transaction(trans
, root
);
3280 * find the highest existing sequence number in a directory
3281 * and then set the in-memory index_cnt variable to reflect
3282 * free sequence numbers
3284 static int btrfs_set_inode_index_count(struct inode
*inode
)
3286 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3287 struct btrfs_key key
, found_key
;
3288 struct btrfs_path
*path
;
3289 struct extent_buffer
*leaf
;
3292 key
.objectid
= inode
->i_ino
;
3293 btrfs_set_key_type(&key
, BTRFS_DIR_INDEX_KEY
);
3294 key
.offset
= (u64
)-1;
3296 path
= btrfs_alloc_path();
3300 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3303 /* FIXME: we should be able to handle this */
3309 * MAGIC NUMBER EXPLANATION:
3310 * since we search a directory based on f_pos we have to start at 2
3311 * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody
3312 * else has to start at 2
3314 if (path
->slots
[0] == 0) {
3315 BTRFS_I(inode
)->index_cnt
= 2;
3321 leaf
= path
->nodes
[0];
3322 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3324 if (found_key
.objectid
!= inode
->i_ino
||
3325 btrfs_key_type(&found_key
) != BTRFS_DIR_INDEX_KEY
) {
3326 BTRFS_I(inode
)->index_cnt
= 2;
3330 BTRFS_I(inode
)->index_cnt
= found_key
.offset
+ 1;
3332 btrfs_free_path(path
);
3337 * helper to find a free sequence number in a given directory. This current
3338 * code is very simple, later versions will do smarter things in the btree
3340 int btrfs_set_inode_index(struct inode
*dir
, u64
*index
)
3344 if (BTRFS_I(dir
)->index_cnt
== (u64
)-1) {
3345 ret
= btrfs_set_inode_index_count(dir
);
3351 *index
= BTRFS_I(dir
)->index_cnt
;
3352 BTRFS_I(dir
)->index_cnt
++;
3357 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
3358 struct btrfs_root
*root
,
3360 const char *name
, int name_len
,
3363 struct btrfs_block_group_cache
*group
,
3364 int mode
, u64
*index
)
3366 struct inode
*inode
;
3367 struct btrfs_inode_item
*inode_item
;
3368 struct btrfs_block_group_cache
*new_inode_group
;
3369 struct btrfs_key
*location
;
3370 struct btrfs_path
*path
;
3371 struct btrfs_inode_ref
*ref
;
3372 struct btrfs_key key
[2];
3378 path
= btrfs_alloc_path();
3381 inode
= new_inode(root
->fs_info
->sb
);
3383 return ERR_PTR(-ENOMEM
);
3386 ret
= btrfs_set_inode_index(dir
, index
);
3388 return ERR_PTR(ret
);
3391 * index_cnt is ignored for everything but a dir,
3392 * btrfs_get_inode_index_count has an explanation for the magic
3395 init_btrfs_i(inode
);
3396 BTRFS_I(inode
)->index_cnt
= 2;
3397 BTRFS_I(inode
)->root
= root
;
3398 BTRFS_I(inode
)->generation
= trans
->transid
;
3404 new_inode_group
= btrfs_find_block_group(root
, group
, 0,
3405 BTRFS_BLOCK_GROUP_METADATA
, owner
);
3406 if (!new_inode_group
) {
3407 printk("find_block group failed\n");
3408 new_inode_group
= group
;
3410 BTRFS_I(inode
)->block_group
= new_inode_group
;
3412 key
[0].objectid
= objectid
;
3413 btrfs_set_key_type(&key
[0], BTRFS_INODE_ITEM_KEY
);
3416 key
[1].objectid
= objectid
;
3417 btrfs_set_key_type(&key
[1], BTRFS_INODE_REF_KEY
);
3418 key
[1].offset
= ref_objectid
;
3420 sizes
[0] = sizeof(struct btrfs_inode_item
);
3421 sizes
[1] = name_len
+ sizeof(*ref
);
3423 ret
= btrfs_insert_empty_items(trans
, root
, path
, key
, sizes
, 2);
3427 if (objectid
> root
->highest_inode
)
3428 root
->highest_inode
= objectid
;
3430 inode
->i_uid
= current_fsuid();
3431 inode
->i_gid
= current_fsgid();
3432 inode
->i_mode
= mode
;
3433 inode
->i_ino
= objectid
;
3434 inode_set_bytes(inode
, 0);
3435 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
3436 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
3437 struct btrfs_inode_item
);
3438 fill_inode_item(trans
, path
->nodes
[0], inode_item
, inode
);
3440 ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0] + 1,
3441 struct btrfs_inode_ref
);
3442 btrfs_set_inode_ref_name_len(path
->nodes
[0], ref
, name_len
);
3443 btrfs_set_inode_ref_index(path
->nodes
[0], ref
, *index
);
3444 ptr
= (unsigned long)(ref
+ 1);
3445 write_extent_buffer(path
->nodes
[0], name
, ptr
, name_len
);
3447 btrfs_mark_buffer_dirty(path
->nodes
[0]);
3448 btrfs_free_path(path
);
3450 location
= &BTRFS_I(inode
)->location
;
3451 location
->objectid
= objectid
;
3452 location
->offset
= 0;
3453 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
3455 insert_inode_hash(inode
);
3459 BTRFS_I(dir
)->index_cnt
--;
3460 btrfs_free_path(path
);
3461 return ERR_PTR(ret
);
3464 static inline u8
btrfs_inode_type(struct inode
*inode
)
3466 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
3470 * utility function to add 'inode' into 'parent_inode' with
3471 * a give name and a given sequence number.
3472 * if 'add_backref' is true, also insert a backref from the
3473 * inode to the parent directory.
3475 int btrfs_add_link(struct btrfs_trans_handle
*trans
,
3476 struct inode
*parent_inode
, struct inode
*inode
,
3477 const char *name
, int name_len
, int add_backref
, u64 index
)
3480 struct btrfs_key key
;
3481 struct btrfs_root
*root
= BTRFS_I(parent_inode
)->root
;
3483 key
.objectid
= inode
->i_ino
;
3484 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
3487 ret
= btrfs_insert_dir_item(trans
, root
, name
, name_len
,
3488 parent_inode
->i_ino
,
3489 &key
, btrfs_inode_type(inode
),
3493 ret
= btrfs_insert_inode_ref(trans
, root
,
3496 parent_inode
->i_ino
,
3499 btrfs_i_size_write(parent_inode
, parent_inode
->i_size
+
3501 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
3502 ret
= btrfs_update_inode(trans
, root
, parent_inode
);
3507 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
3508 struct dentry
*dentry
, struct inode
*inode
,
3509 int backref
, u64 index
)
3511 int err
= btrfs_add_link(trans
, dentry
->d_parent
->d_inode
,
3512 inode
, dentry
->d_name
.name
,
3513 dentry
->d_name
.len
, backref
, index
);
3515 d_instantiate(dentry
, inode
);
3523 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
3524 int mode
, dev_t rdev
)
3526 struct btrfs_trans_handle
*trans
;
3527 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3528 struct inode
*inode
= NULL
;
3532 unsigned long nr
= 0;
3535 if (!new_valid_dev(rdev
))
3538 err
= btrfs_check_free_space(root
, 1, 0);
3542 trans
= btrfs_start_transaction(root
, 1);
3543 btrfs_set_trans_block_group(trans
, dir
);
3545 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
3551 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
3553 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
3554 BTRFS_I(dir
)->block_group
, mode
, &index
);
3555 err
= PTR_ERR(inode
);
3559 err
= btrfs_init_acl(inode
, dir
);
3565 btrfs_set_trans_block_group(trans
, inode
);
3566 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0, index
);
3570 inode
->i_op
= &btrfs_special_inode_operations
;
3571 init_special_inode(inode
, inode
->i_mode
, rdev
);
3572 btrfs_update_inode(trans
, root
, inode
);
3574 dir
->i_sb
->s_dirt
= 1;
3575 btrfs_update_inode_block_group(trans
, inode
);
3576 btrfs_update_inode_block_group(trans
, dir
);
3578 nr
= trans
->blocks_used
;
3579 btrfs_end_transaction_throttle(trans
, root
);
3582 inode_dec_link_count(inode
);
3585 btrfs_btree_balance_dirty(root
, nr
);
3589 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
3590 int mode
, struct nameidata
*nd
)
3592 struct btrfs_trans_handle
*trans
;
3593 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3594 struct inode
*inode
= NULL
;
3597 unsigned long nr
= 0;
3601 err
= btrfs_check_free_space(root
, 1, 0);
3604 trans
= btrfs_start_transaction(root
, 1);
3605 btrfs_set_trans_block_group(trans
, dir
);
3607 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
3613 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
3615 dentry
->d_parent
->d_inode
->i_ino
,
3616 objectid
, BTRFS_I(dir
)->block_group
, mode
,
3618 err
= PTR_ERR(inode
);
3622 err
= btrfs_init_acl(inode
, dir
);
3628 btrfs_set_trans_block_group(trans
, inode
);
3629 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0, index
);
3633 inode
->i_mapping
->a_ops
= &btrfs_aops
;
3634 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
3635 inode
->i_fop
= &btrfs_file_operations
;
3636 inode
->i_op
= &btrfs_file_inode_operations
;
3637 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
3639 dir
->i_sb
->s_dirt
= 1;
3640 btrfs_update_inode_block_group(trans
, inode
);
3641 btrfs_update_inode_block_group(trans
, dir
);
3643 nr
= trans
->blocks_used
;
3644 btrfs_end_transaction_throttle(trans
, root
);
3647 inode_dec_link_count(inode
);
3650 btrfs_btree_balance_dirty(root
, nr
);
3654 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
3655 struct dentry
*dentry
)
3657 struct btrfs_trans_handle
*trans
;
3658 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3659 struct inode
*inode
= old_dentry
->d_inode
;
3661 unsigned long nr
= 0;
3665 if (inode
->i_nlink
== 0)
3668 btrfs_inc_nlink(inode
);
3669 err
= btrfs_check_free_space(root
, 1, 0);
3672 err
= btrfs_set_inode_index(dir
, &index
);
3676 trans
= btrfs_start_transaction(root
, 1);
3678 btrfs_set_trans_block_group(trans
, dir
);
3679 atomic_inc(&inode
->i_count
);
3681 err
= btrfs_add_nondir(trans
, dentry
, inode
, 1, index
);
3686 dir
->i_sb
->s_dirt
= 1;
3687 btrfs_update_inode_block_group(trans
, dir
);
3688 err
= btrfs_update_inode(trans
, root
, inode
);
3693 nr
= trans
->blocks_used
;
3694 btrfs_end_transaction_throttle(trans
, root
);
3697 inode_dec_link_count(inode
);
3700 btrfs_btree_balance_dirty(root
, nr
);
3704 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
3706 struct inode
*inode
= NULL
;
3707 struct btrfs_trans_handle
*trans
;
3708 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3710 int drop_on_err
= 0;
3713 unsigned long nr
= 1;
3715 err
= btrfs_check_free_space(root
, 1, 0);
3719 trans
= btrfs_start_transaction(root
, 1);
3720 btrfs_set_trans_block_group(trans
, dir
);
3722 if (IS_ERR(trans
)) {
3723 err
= PTR_ERR(trans
);
3727 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
3733 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
3735 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
3736 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
,
3738 if (IS_ERR(inode
)) {
3739 err
= PTR_ERR(inode
);
3745 err
= btrfs_init_acl(inode
, dir
);
3749 inode
->i_op
= &btrfs_dir_inode_operations
;
3750 inode
->i_fop
= &btrfs_dir_file_operations
;
3751 btrfs_set_trans_block_group(trans
, inode
);
3753 btrfs_i_size_write(inode
, 0);
3754 err
= btrfs_update_inode(trans
, root
, inode
);
3758 err
= btrfs_add_link(trans
, dentry
->d_parent
->d_inode
,
3759 inode
, dentry
->d_name
.name
,
3760 dentry
->d_name
.len
, 0, index
);
3764 d_instantiate(dentry
, inode
);
3766 dir
->i_sb
->s_dirt
= 1;
3767 btrfs_update_inode_block_group(trans
, inode
);
3768 btrfs_update_inode_block_group(trans
, dir
);
3771 nr
= trans
->blocks_used
;
3772 btrfs_end_transaction_throttle(trans
, root
);
3777 btrfs_btree_balance_dirty(root
, nr
);
3781 /* helper for btfs_get_extent. Given an existing extent in the tree,
3782 * and an extent that you want to insert, deal with overlap and insert
3783 * the new extent into the tree.
3785 static int merge_extent_mapping(struct extent_map_tree
*em_tree
,
3786 struct extent_map
*existing
,
3787 struct extent_map
*em
,
3788 u64 map_start
, u64 map_len
)
3792 BUG_ON(map_start
< em
->start
|| map_start
>= extent_map_end(em
));
3793 start_diff
= map_start
- em
->start
;
3794 em
->start
= map_start
;
3796 if (em
->block_start
< EXTENT_MAP_LAST_BYTE
&&
3797 !test_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
)) {
3798 em
->block_start
+= start_diff
;
3799 em
->block_len
-= start_diff
;
3801 return add_extent_mapping(em_tree
, em
);
3804 static noinline
int uncompress_inline(struct btrfs_path
*path
,
3805 struct inode
*inode
, struct page
*page
,
3806 size_t pg_offset
, u64 extent_offset
,
3807 struct btrfs_file_extent_item
*item
)
3810 struct extent_buffer
*leaf
= path
->nodes
[0];
3813 unsigned long inline_size
;
3816 WARN_ON(pg_offset
!= 0);
3817 max_size
= btrfs_file_extent_ram_bytes(leaf
, item
);
3818 inline_size
= btrfs_file_extent_inline_item_len(leaf
,
3819 btrfs_item_nr(leaf
, path
->slots
[0]));
3820 tmp
= kmalloc(inline_size
, GFP_NOFS
);
3821 ptr
= btrfs_file_extent_inline_start(item
);
3823 read_extent_buffer(leaf
, tmp
, ptr
, inline_size
);
3825 max_size
= min_t(unsigned long, PAGE_CACHE_SIZE
, max_size
);
3826 ret
= btrfs_zlib_decompress(tmp
, page
, extent_offset
,
3827 inline_size
, max_size
);
3829 char *kaddr
= kmap_atomic(page
, KM_USER0
);
3830 unsigned long copy_size
= min_t(u64
,
3831 PAGE_CACHE_SIZE
- pg_offset
,
3832 max_size
- extent_offset
);
3833 memset(kaddr
+ pg_offset
, 0, copy_size
);
3834 kunmap_atomic(kaddr
, KM_USER0
);
3841 * a bit scary, this does extent mapping from logical file offset to the disk.
3842 * the ugly parts come from merging extents from the disk with the
3843 * in-ram representation. This gets more complex because of the data=ordered code,
3844 * where the in-ram extents might be locked pending data=ordered completion.
3846 * This also copies inline extents directly into the page.
3848 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
3849 size_t pg_offset
, u64 start
, u64 len
,
3855 u64 extent_start
= 0;
3857 u64 objectid
= inode
->i_ino
;
3859 struct btrfs_path
*path
= NULL
;
3860 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3861 struct btrfs_file_extent_item
*item
;
3862 struct extent_buffer
*leaf
;
3863 struct btrfs_key found_key
;
3864 struct extent_map
*em
= NULL
;
3865 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
3866 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
3867 struct btrfs_trans_handle
*trans
= NULL
;
3871 spin_lock(&em_tree
->lock
);
3872 em
= lookup_extent_mapping(em_tree
, start
, len
);
3874 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
3875 spin_unlock(&em_tree
->lock
);
3878 if (em
->start
> start
|| em
->start
+ em
->len
<= start
)
3879 free_extent_map(em
);
3880 else if (em
->block_start
== EXTENT_MAP_INLINE
&& page
)
3881 free_extent_map(em
);
3885 em
= alloc_extent_map(GFP_NOFS
);
3890 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
3891 em
->start
= EXTENT_MAP_HOLE
;
3892 em
->orig_start
= EXTENT_MAP_HOLE
;
3894 em
->block_len
= (u64
)-1;
3897 path
= btrfs_alloc_path();
3901 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
3902 objectid
, start
, trans
!= NULL
);
3909 if (path
->slots
[0] == 0)
3914 leaf
= path
->nodes
[0];
3915 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
3916 struct btrfs_file_extent_item
);
3917 /* are we inside the extent that was found? */
3918 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3919 found_type
= btrfs_key_type(&found_key
);
3920 if (found_key
.objectid
!= objectid
||
3921 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
3925 found_type
= btrfs_file_extent_type(leaf
, item
);
3926 extent_start
= found_key
.offset
;
3927 compressed
= btrfs_file_extent_compression(leaf
, item
);
3928 if (found_type
== BTRFS_FILE_EXTENT_REG
||
3929 found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3930 extent_end
= extent_start
+
3931 btrfs_file_extent_num_bytes(leaf
, item
);
3932 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
3934 size
= btrfs_file_extent_inline_len(leaf
, item
);
3935 extent_end
= (extent_start
+ size
+ root
->sectorsize
- 1) &
3936 ~((u64
)root
->sectorsize
- 1);
3939 if (start
>= extent_end
) {
3941 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
3942 ret
= btrfs_next_leaf(root
, path
);
3949 leaf
= path
->nodes
[0];
3951 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3952 if (found_key
.objectid
!= objectid
||
3953 found_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
3955 if (start
+ len
<= found_key
.offset
)
3958 em
->len
= found_key
.offset
- start
;
3962 if (found_type
== BTRFS_FILE_EXTENT_REG
||
3963 found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
3964 em
->start
= extent_start
;
3965 em
->len
= extent_end
- extent_start
;
3966 em
->orig_start
= extent_start
-
3967 btrfs_file_extent_offset(leaf
, item
);
3968 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
3970 em
->block_start
= EXTENT_MAP_HOLE
;
3974 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
3975 em
->block_start
= bytenr
;
3976 em
->block_len
= btrfs_file_extent_disk_num_bytes(leaf
,
3979 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
3980 em
->block_start
= bytenr
;
3981 em
->block_len
= em
->len
;
3982 if (found_type
== BTRFS_FILE_EXTENT_PREALLOC
)
3983 set_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
);
3986 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
3990 size_t extent_offset
;
3993 em
->block_start
= EXTENT_MAP_INLINE
;
3994 if (!page
|| create
) {
3995 em
->start
= extent_start
;
3996 em
->len
= extent_end
- extent_start
;
4000 size
= btrfs_file_extent_inline_len(leaf
, item
);
4001 extent_offset
= page_offset(page
) + pg_offset
- extent_start
;
4002 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- pg_offset
,
4003 size
- extent_offset
);
4004 em
->start
= extent_start
+ extent_offset
;
4005 em
->len
= (copy_size
+ root
->sectorsize
- 1) &
4006 ~((u64
)root
->sectorsize
- 1);
4007 em
->orig_start
= EXTENT_MAP_INLINE
;
4009 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
4010 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
4011 if (create
== 0 && !PageUptodate(page
)) {
4012 if (btrfs_file_extent_compression(leaf
, item
) ==
4013 BTRFS_COMPRESS_ZLIB
) {
4014 ret
= uncompress_inline(path
, inode
, page
,
4016 extent_offset
, item
);
4020 read_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
4024 flush_dcache_page(page
);
4025 } else if (create
&& PageUptodate(page
)) {
4028 free_extent_map(em
);
4030 btrfs_release_path(root
, path
);
4031 trans
= btrfs_join_transaction(root
, 1);
4035 write_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
4038 btrfs_mark_buffer_dirty(leaf
);
4040 set_extent_uptodate(io_tree
, em
->start
,
4041 extent_map_end(em
) - 1, GFP_NOFS
);
4044 printk("unkknown found_type %d\n", found_type
);
4051 em
->block_start
= EXTENT_MAP_HOLE
;
4052 set_bit(EXTENT_FLAG_VACANCY
, &em
->flags
);
4054 btrfs_release_path(root
, path
);
4055 if (em
->start
> start
|| extent_map_end(em
) <= start
) {
4056 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->len
, start
, len
);
4062 spin_lock(&em_tree
->lock
);
4063 ret
= add_extent_mapping(em_tree
, em
);
4064 /* it is possible that someone inserted the extent into the tree
4065 * while we had the lock dropped. It is also possible that
4066 * an overlapping map exists in the tree
4068 if (ret
== -EEXIST
) {
4069 struct extent_map
*existing
;
4073 existing
= lookup_extent_mapping(em_tree
, start
, len
);
4074 if (existing
&& (existing
->start
> start
||
4075 existing
->start
+ existing
->len
<= start
)) {
4076 free_extent_map(existing
);
4080 existing
= lookup_extent_mapping(em_tree
, em
->start
,
4083 err
= merge_extent_mapping(em_tree
, existing
,
4086 free_extent_map(existing
);
4088 free_extent_map(em
);
4093 printk("failing to insert %Lu %Lu\n",
4095 free_extent_map(em
);
4099 free_extent_map(em
);
4104 spin_unlock(&em_tree
->lock
);
4107 btrfs_free_path(path
);
4109 ret
= btrfs_end_transaction(trans
, root
);
4115 free_extent_map(em
);
4117 return ERR_PTR(err
);
4122 static ssize_t
btrfs_direct_IO(int rw
, struct kiocb
*iocb
,
4123 const struct iovec
*iov
, loff_t offset
,
4124 unsigned long nr_segs
)
4129 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
4131 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
4134 int btrfs_readpage(struct file
*file
, struct page
*page
)
4136 struct extent_io_tree
*tree
;
4137 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
4138 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
4141 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
4143 struct extent_io_tree
*tree
;
4146 if (current
->flags
& PF_MEMALLOC
) {
4147 redirty_page_for_writepage(wbc
, page
);
4151 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
4152 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
4155 int btrfs_writepages(struct address_space
*mapping
,
4156 struct writeback_control
*wbc
)
4158 struct extent_io_tree
*tree
;
4160 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
4161 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
4165 btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
4166 struct list_head
*pages
, unsigned nr_pages
)
4168 struct extent_io_tree
*tree
;
4169 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
4170 return extent_readpages(tree
, mapping
, pages
, nr_pages
,
4173 static int __btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
4175 struct extent_io_tree
*tree
;
4176 struct extent_map_tree
*map
;
4179 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
4180 map
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
4181 ret
= try_release_extent_mapping(map
, tree
, page
, gfp_flags
);
4183 ClearPagePrivate(page
);
4184 set_page_private(page
, 0);
4185 page_cache_release(page
);
4190 static int btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
4192 if (PageWriteback(page
) || PageDirty(page
))
4194 return __btrfs_releasepage(page
, gfp_flags
);
4197 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
4199 struct extent_io_tree
*tree
;
4200 struct btrfs_ordered_extent
*ordered
;
4201 u64 page_start
= page_offset(page
);
4202 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
4204 wait_on_page_writeback(page
);
4205 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
4207 btrfs_releasepage(page
, GFP_NOFS
);
4211 lock_extent(tree
, page_start
, page_end
, GFP_NOFS
);
4212 ordered
= btrfs_lookup_ordered_extent(page
->mapping
->host
,
4216 * IO on this page will never be started, so we need
4217 * to account for any ordered extents now
4219 clear_extent_bit(tree
, page_start
, page_end
,
4220 EXTENT_DIRTY
| EXTENT_DELALLOC
|
4221 EXTENT_LOCKED
, 1, 0, GFP_NOFS
);
4222 btrfs_finish_ordered_io(page
->mapping
->host
,
4223 page_start
, page_end
);
4224 btrfs_put_ordered_extent(ordered
);
4225 lock_extent(tree
, page_start
, page_end
, GFP_NOFS
);
4227 clear_extent_bit(tree
, page_start
, page_end
,
4228 EXTENT_LOCKED
| EXTENT_DIRTY
| EXTENT_DELALLOC
|
4231 __btrfs_releasepage(page
, GFP_NOFS
);
4233 ClearPageChecked(page
);
4234 if (PagePrivate(page
)) {
4235 ClearPagePrivate(page
);
4236 set_page_private(page
, 0);
4237 page_cache_release(page
);
4242 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
4243 * called from a page fault handler when a page is first dirtied. Hence we must
4244 * be careful to check for EOF conditions here. We set the page up correctly
4245 * for a written page which means we get ENOSPC checking when writing into
4246 * holes and correct delalloc and unwritten extent mapping on filesystems that
4247 * support these features.
4249 * We are not allowed to take the i_mutex here so we have to play games to
4250 * protect against truncate races as the page could now be beyond EOF. Because
4251 * vmtruncate() writes the inode size before removing pages, once we have the
4252 * page lock we can determine safely if the page is beyond EOF. If it is not
4253 * beyond EOF, then the page is guaranteed safe against truncation until we
4256 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
4258 struct inode
*inode
= fdentry(vma
->vm_file
)->d_inode
;
4259 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4260 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4261 struct btrfs_ordered_extent
*ordered
;
4263 unsigned long zero_start
;
4269 ret
= btrfs_check_free_space(root
, PAGE_CACHE_SIZE
, 0);
4276 size
= i_size_read(inode
);
4277 page_start
= page_offset(page
);
4278 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
4280 if ((page
->mapping
!= inode
->i_mapping
) ||
4281 (page_start
>= size
)) {
4282 /* page got truncated out from underneath us */
4285 wait_on_page_writeback(page
);
4287 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
4288 set_page_extent_mapped(page
);
4291 * we can't set the delalloc bits if there are pending ordered
4292 * extents. Drop our locks and wait for them to finish
4294 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
4296 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
4298 btrfs_start_ordered_extent(inode
, ordered
, 1);
4299 btrfs_put_ordered_extent(ordered
);
4303 btrfs_set_extent_delalloc(inode
, page_start
, page_end
);
4306 /* page is wholly or partially inside EOF */
4307 if (page_start
+ PAGE_CACHE_SIZE
> size
)
4308 zero_start
= size
& ~PAGE_CACHE_MASK
;
4310 zero_start
= PAGE_CACHE_SIZE
;
4312 if (zero_start
!= PAGE_CACHE_SIZE
) {
4314 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
4315 flush_dcache_page(page
);
4318 ClearPageChecked(page
);
4319 set_page_dirty(page
);
4320 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
4328 static void btrfs_truncate(struct inode
*inode
)
4330 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4332 struct btrfs_trans_handle
*trans
;
4334 u64 mask
= root
->sectorsize
- 1;
4336 if (!S_ISREG(inode
->i_mode
))
4338 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
4341 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
4342 btrfs_wait_ordered_range(inode
, inode
->i_size
& (~mask
), (u64
)-1);
4344 trans
= btrfs_start_transaction(root
, 1);
4345 btrfs_set_trans_block_group(trans
, inode
);
4346 btrfs_i_size_write(inode
, inode
->i_size
);
4348 ret
= btrfs_orphan_add(trans
, inode
);
4351 /* FIXME, add redo link to tree so we don't leak on crash */
4352 ret
= btrfs_truncate_inode_items(trans
, root
, inode
, inode
->i_size
,
4353 BTRFS_EXTENT_DATA_KEY
);
4354 btrfs_update_inode(trans
, root
, inode
);
4356 ret
= btrfs_orphan_del(trans
, inode
);
4360 nr
= trans
->blocks_used
;
4361 ret
= btrfs_end_transaction_throttle(trans
, root
);
4363 btrfs_btree_balance_dirty(root
, nr
);
4367 * create a new subvolume directory/inode (helper for the ioctl).
4369 int btrfs_create_subvol_root(struct btrfs_root
*new_root
, struct dentry
*dentry
,
4370 struct btrfs_trans_handle
*trans
, u64 new_dirid
,
4371 struct btrfs_block_group_cache
*block_group
)
4373 struct inode
*inode
;
4377 inode
= btrfs_new_inode(trans
, new_root
, NULL
, "..", 2, new_dirid
,
4378 new_dirid
, block_group
, S_IFDIR
| 0700, &index
);
4380 return PTR_ERR(inode
);
4381 inode
->i_op
= &btrfs_dir_inode_operations
;
4382 inode
->i_fop
= &btrfs_dir_file_operations
;
4385 btrfs_i_size_write(inode
, 0);
4387 error
= btrfs_update_inode(trans
, new_root
, inode
);
4391 d_instantiate(dentry
, inode
);
4395 /* helper function for file defrag and space balancing. This
4396 * forces readahead on a given range of bytes in an inode
4398 unsigned long btrfs_force_ra(struct address_space
*mapping
,
4399 struct file_ra_state
*ra
, struct file
*file
,
4400 pgoff_t offset
, pgoff_t last_index
)
4402 pgoff_t req_size
= last_index
- offset
+ 1;
4404 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
4405 return offset
+ req_size
;
4408 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
4410 struct btrfs_inode
*ei
;
4412 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
4416 ei
->logged_trans
= 0;
4417 btrfs_ordered_inode_tree_init(&ei
->ordered_tree
);
4418 ei
->i_acl
= BTRFS_ACL_NOT_CACHED
;
4419 ei
->i_default_acl
= BTRFS_ACL_NOT_CACHED
;
4420 INIT_LIST_HEAD(&ei
->i_orphan
);
4421 return &ei
->vfs_inode
;
4424 void btrfs_destroy_inode(struct inode
*inode
)
4426 struct btrfs_ordered_extent
*ordered
;
4427 WARN_ON(!list_empty(&inode
->i_dentry
));
4428 WARN_ON(inode
->i_data
.nrpages
);
4430 if (BTRFS_I(inode
)->i_acl
&&
4431 BTRFS_I(inode
)->i_acl
!= BTRFS_ACL_NOT_CACHED
)
4432 posix_acl_release(BTRFS_I(inode
)->i_acl
);
4433 if (BTRFS_I(inode
)->i_default_acl
&&
4434 BTRFS_I(inode
)->i_default_acl
!= BTRFS_ACL_NOT_CACHED
)
4435 posix_acl_release(BTRFS_I(inode
)->i_default_acl
);
4437 spin_lock(&BTRFS_I(inode
)->root
->list_lock
);
4438 if (!list_empty(&BTRFS_I(inode
)->i_orphan
)) {
4439 printk(KERN_ERR
"BTRFS: inode %lu: inode still on the orphan"
4440 " list\n", inode
->i_ino
);
4443 spin_unlock(&BTRFS_I(inode
)->root
->list_lock
);
4446 ordered
= btrfs_lookup_first_ordered_extent(inode
, (u64
)-1);
4450 printk("found ordered extent %Lu %Lu\n",
4451 ordered
->file_offset
, ordered
->len
);
4452 btrfs_remove_ordered_extent(inode
, ordered
);
4453 btrfs_put_ordered_extent(ordered
);
4454 btrfs_put_ordered_extent(ordered
);
4457 btrfs_drop_extent_cache(inode
, 0, (u64
)-1, 0);
4458 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
4461 static void init_once(void *foo
)
4463 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
4465 inode_init_once(&ei
->vfs_inode
);
4468 void btrfs_destroy_cachep(void)
4470 if (btrfs_inode_cachep
)
4471 kmem_cache_destroy(btrfs_inode_cachep
);
4472 if (btrfs_trans_handle_cachep
)
4473 kmem_cache_destroy(btrfs_trans_handle_cachep
);
4474 if (btrfs_transaction_cachep
)
4475 kmem_cache_destroy(btrfs_transaction_cachep
);
4476 if (btrfs_bit_radix_cachep
)
4477 kmem_cache_destroy(btrfs_bit_radix_cachep
);
4478 if (btrfs_path_cachep
)
4479 kmem_cache_destroy(btrfs_path_cachep
);
4482 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
4483 unsigned long extra_flags
,
4484 void (*ctor
)(void *))
4486 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
4487 SLAB_MEM_SPREAD
| extra_flags
), ctor
);
4490 int btrfs_init_cachep(void)
4492 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
4493 sizeof(struct btrfs_inode
),
4495 if (!btrfs_inode_cachep
)
4497 btrfs_trans_handle_cachep
=
4498 btrfs_cache_create("btrfs_trans_handle_cache",
4499 sizeof(struct btrfs_trans_handle
),
4501 if (!btrfs_trans_handle_cachep
)
4503 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
4504 sizeof(struct btrfs_transaction
),
4506 if (!btrfs_transaction_cachep
)
4508 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
4509 sizeof(struct btrfs_path
),
4511 if (!btrfs_path_cachep
)
4513 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
4514 SLAB_DESTROY_BY_RCU
, NULL
);
4515 if (!btrfs_bit_radix_cachep
)
4519 btrfs_destroy_cachep();
4523 static int btrfs_getattr(struct vfsmount
*mnt
,
4524 struct dentry
*dentry
, struct kstat
*stat
)
4526 struct inode
*inode
= dentry
->d_inode
;
4527 generic_fillattr(inode
, stat
);
4528 stat
->dev
= BTRFS_I(inode
)->root
->anon_super
.s_dev
;
4529 stat
->blksize
= PAGE_CACHE_SIZE
;
4530 stat
->blocks
= (inode_get_bytes(inode
) +
4531 BTRFS_I(inode
)->delalloc_bytes
) >> 9;
4535 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
4536 struct inode
* new_dir
,struct dentry
*new_dentry
)
4538 struct btrfs_trans_handle
*trans
;
4539 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
4540 struct inode
*new_inode
= new_dentry
->d_inode
;
4541 struct inode
*old_inode
= old_dentry
->d_inode
;
4542 struct timespec ctime
= CURRENT_TIME
;
4546 /* we're not allowed to rename between subvolumes */
4547 if (BTRFS_I(old_inode
)->root
->root_key
.objectid
!=
4548 BTRFS_I(new_dir
)->root
->root_key
.objectid
)
4551 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
4552 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
4556 /* to rename a snapshot or subvolume, we need to juggle the
4557 * backrefs. This isn't coded yet
4559 if (old_inode
->i_ino
== BTRFS_FIRST_FREE_OBJECTID
)
4562 ret
= btrfs_check_free_space(root
, 1, 0);
4566 trans
= btrfs_start_transaction(root
, 1);
4568 btrfs_set_trans_block_group(trans
, new_dir
);
4570 btrfs_inc_nlink(old_dentry
->d_inode
);
4571 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
4572 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
4573 old_inode
->i_ctime
= ctime
;
4575 ret
= btrfs_unlink_inode(trans
, root
, old_dir
, old_dentry
->d_inode
,
4576 old_dentry
->d_name
.name
,
4577 old_dentry
->d_name
.len
);
4582 new_inode
->i_ctime
= CURRENT_TIME
;
4583 ret
= btrfs_unlink_inode(trans
, root
, new_dir
,
4584 new_dentry
->d_inode
,
4585 new_dentry
->d_name
.name
,
4586 new_dentry
->d_name
.len
);
4589 if (new_inode
->i_nlink
== 0) {
4590 ret
= btrfs_orphan_add(trans
, new_dentry
->d_inode
);
4596 ret
= btrfs_set_inode_index(new_dir
, &index
);
4600 ret
= btrfs_add_link(trans
, new_dentry
->d_parent
->d_inode
,
4601 old_inode
, new_dentry
->d_name
.name
,
4602 new_dentry
->d_name
.len
, 1, index
);
4607 btrfs_end_transaction_throttle(trans
, root
);
4613 * some fairly slow code that needs optimization. This walks the list
4614 * of all the inodes with pending delalloc and forces them to disk.
4616 int btrfs_start_delalloc_inodes(struct btrfs_root
*root
)
4618 struct list_head
*head
= &root
->fs_info
->delalloc_inodes
;
4619 struct btrfs_inode
*binode
;
4620 struct inode
*inode
;
4621 unsigned long flags
;
4623 if (root
->fs_info
->sb
->s_flags
& MS_RDONLY
)
4626 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
4627 while(!list_empty(head
)) {
4628 binode
= list_entry(head
->next
, struct btrfs_inode
,
4630 inode
= igrab(&binode
->vfs_inode
);
4632 list_del_init(&binode
->delalloc_inodes
);
4633 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
4635 filemap_flush(inode
->i_mapping
);
4639 spin_lock_irqsave(&root
->fs_info
->delalloc_lock
, flags
);
4641 spin_unlock_irqrestore(&root
->fs_info
->delalloc_lock
, flags
);
4643 /* the filemap_flush will queue IO into the worker threads, but
4644 * we have to make sure the IO is actually started and that
4645 * ordered extents get created before we return
4647 atomic_inc(&root
->fs_info
->async_submit_draining
);
4648 while(atomic_read(&root
->fs_info
->nr_async_submits
) ||
4649 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
4650 wait_event(root
->fs_info
->async_submit_wait
,
4651 (atomic_read(&root
->fs_info
->nr_async_submits
) == 0 &&
4652 atomic_read(&root
->fs_info
->async_delalloc_pages
) == 0));
4654 atomic_dec(&root
->fs_info
->async_submit_draining
);
4658 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
4659 const char *symname
)
4661 struct btrfs_trans_handle
*trans
;
4662 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
4663 struct btrfs_path
*path
;
4664 struct btrfs_key key
;
4665 struct inode
*inode
= NULL
;
4673 struct btrfs_file_extent_item
*ei
;
4674 struct extent_buffer
*leaf
;
4675 unsigned long nr
= 0;
4677 name_len
= strlen(symname
) + 1;
4678 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
4679 return -ENAMETOOLONG
;
4681 err
= btrfs_check_free_space(root
, 1, 0);
4685 trans
= btrfs_start_transaction(root
, 1);
4686 btrfs_set_trans_block_group(trans
, dir
);
4688 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
4694 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
4696 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
4697 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
,
4699 err
= PTR_ERR(inode
);
4703 err
= btrfs_init_acl(inode
, dir
);
4709 btrfs_set_trans_block_group(trans
, inode
);
4710 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0, index
);
4714 inode
->i_mapping
->a_ops
= &btrfs_aops
;
4715 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
4716 inode
->i_fop
= &btrfs_file_operations
;
4717 inode
->i_op
= &btrfs_file_inode_operations
;
4718 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
4720 dir
->i_sb
->s_dirt
= 1;
4721 btrfs_update_inode_block_group(trans
, inode
);
4722 btrfs_update_inode_block_group(trans
, dir
);
4726 path
= btrfs_alloc_path();
4728 key
.objectid
= inode
->i_ino
;
4730 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
4731 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
4732 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
4738 leaf
= path
->nodes
[0];
4739 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
4740 struct btrfs_file_extent_item
);
4741 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
4742 btrfs_set_file_extent_type(leaf
, ei
,
4743 BTRFS_FILE_EXTENT_INLINE
);
4744 btrfs_set_file_extent_encryption(leaf
, ei
, 0);
4745 btrfs_set_file_extent_compression(leaf
, ei
, 0);
4746 btrfs_set_file_extent_other_encoding(leaf
, ei
, 0);
4747 btrfs_set_file_extent_ram_bytes(leaf
, ei
, name_len
);
4749 ptr
= btrfs_file_extent_inline_start(ei
);
4750 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
4751 btrfs_mark_buffer_dirty(leaf
);
4752 btrfs_free_path(path
);
4754 inode
->i_op
= &btrfs_symlink_inode_operations
;
4755 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
4756 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
4757 inode_set_bytes(inode
, name_len
);
4758 btrfs_i_size_write(inode
, name_len
- 1);
4759 err
= btrfs_update_inode(trans
, root
, inode
);
4764 nr
= trans
->blocks_used
;
4765 btrfs_end_transaction_throttle(trans
, root
);
4768 inode_dec_link_count(inode
);
4771 btrfs_btree_balance_dirty(root
, nr
);
4775 static int prealloc_file_range(struct inode
*inode
, u64 start
, u64 end
,
4776 u64 alloc_hint
, int mode
)
4778 struct btrfs_trans_handle
*trans
;
4779 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4780 struct btrfs_key ins
;
4782 u64 cur_offset
= start
;
4783 u64 num_bytes
= end
- start
;
4786 trans
= btrfs_join_transaction(root
, 1);
4788 btrfs_set_trans_block_group(trans
, inode
);
4790 while (num_bytes
> 0) {
4791 alloc_size
= min(num_bytes
, root
->fs_info
->max_extent
);
4792 ret
= btrfs_reserve_extent(trans
, root
, alloc_size
,
4793 root
->sectorsize
, 0, alloc_hint
,
4799 ret
= insert_reserved_file_extent(trans
, inode
,
4800 cur_offset
, ins
.objectid
,
4801 ins
.offset
, ins
.offset
,
4802 ins
.offset
, 0, 0, 0,
4803 BTRFS_FILE_EXTENT_PREALLOC
);
4805 num_bytes
-= ins
.offset
;
4806 cur_offset
+= ins
.offset
;
4807 alloc_hint
= ins
.objectid
+ ins
.offset
;
4810 if (cur_offset
> start
) {
4811 inode
->i_ctime
= CURRENT_TIME
;
4812 btrfs_set_flag(inode
, PREALLOC
);
4813 if (!(mode
& FALLOC_FL_KEEP_SIZE
) &&
4814 cur_offset
> i_size_read(inode
))
4815 btrfs_i_size_write(inode
, cur_offset
);
4816 ret
= btrfs_update_inode(trans
, root
, inode
);
4820 btrfs_end_transaction(trans
, root
);
4824 static long btrfs_fallocate(struct inode
*inode
, int mode
,
4825 loff_t offset
, loff_t len
)
4832 u64 mask
= BTRFS_I(inode
)->root
->sectorsize
- 1;
4833 struct extent_map
*em
;
4836 alloc_start
= offset
& ~mask
;
4837 alloc_end
= (offset
+ len
+ mask
) & ~mask
;
4839 mutex_lock(&inode
->i_mutex
);
4840 if (alloc_start
> inode
->i_size
) {
4841 ret
= btrfs_cont_expand(inode
, alloc_start
);
4847 struct btrfs_ordered_extent
*ordered
;
4848 lock_extent(&BTRFS_I(inode
)->io_tree
, alloc_start
,
4849 alloc_end
- 1, GFP_NOFS
);
4850 ordered
= btrfs_lookup_first_ordered_extent(inode
,
4853 ordered
->file_offset
+ ordered
->len
> alloc_start
&&
4854 ordered
->file_offset
< alloc_end
) {
4855 btrfs_put_ordered_extent(ordered
);
4856 unlock_extent(&BTRFS_I(inode
)->io_tree
,
4857 alloc_start
, alloc_end
- 1, GFP_NOFS
);
4858 btrfs_wait_ordered_range(inode
, alloc_start
,
4859 alloc_end
- alloc_start
);
4862 btrfs_put_ordered_extent(ordered
);
4867 cur_offset
= alloc_start
;
4869 em
= btrfs_get_extent(inode
, NULL
, 0, cur_offset
,
4870 alloc_end
- cur_offset
, 0);
4871 BUG_ON(IS_ERR(em
) || !em
);
4872 last_byte
= min(extent_map_end(em
), alloc_end
);
4873 last_byte
= (last_byte
+ mask
) & ~mask
;
4874 if (em
->block_start
== EXTENT_MAP_HOLE
) {
4875 ret
= prealloc_file_range(inode
, cur_offset
,
4876 last_byte
, alloc_hint
, mode
);
4878 free_extent_map(em
);
4882 if (em
->block_start
<= EXTENT_MAP_LAST_BYTE
)
4883 alloc_hint
= em
->block_start
;
4884 free_extent_map(em
);
4886 cur_offset
= last_byte
;
4887 if (cur_offset
>= alloc_end
) {
4892 unlock_extent(&BTRFS_I(inode
)->io_tree
, alloc_start
, alloc_end
- 1,
4895 mutex_unlock(&inode
->i_mutex
);
4899 static int btrfs_set_page_dirty(struct page
*page
)
4901 return __set_page_dirty_nobuffers(page
);
4904 static int btrfs_permission(struct inode
*inode
, int mask
)
4906 if (btrfs_test_flag(inode
, READONLY
) && (mask
& MAY_WRITE
))
4908 return generic_permission(inode
, mask
, btrfs_check_acl
);
4911 static struct inode_operations btrfs_dir_inode_operations
= {
4912 .getattr
= btrfs_getattr
,
4913 .lookup
= btrfs_lookup
,
4914 .create
= btrfs_create
,
4915 .unlink
= btrfs_unlink
,
4917 .mkdir
= btrfs_mkdir
,
4918 .rmdir
= btrfs_rmdir
,
4919 .rename
= btrfs_rename
,
4920 .symlink
= btrfs_symlink
,
4921 .setattr
= btrfs_setattr
,
4922 .mknod
= btrfs_mknod
,
4923 .setxattr
= btrfs_setxattr
,
4924 .getxattr
= btrfs_getxattr
,
4925 .listxattr
= btrfs_listxattr
,
4926 .removexattr
= btrfs_removexattr
,
4927 .permission
= btrfs_permission
,
4929 static struct inode_operations btrfs_dir_ro_inode_operations
= {
4930 .lookup
= btrfs_lookup
,
4931 .permission
= btrfs_permission
,
4933 static struct file_operations btrfs_dir_file_operations
= {
4934 .llseek
= generic_file_llseek
,
4935 .read
= generic_read_dir
,
4936 .readdir
= btrfs_real_readdir
,
4937 .unlocked_ioctl
= btrfs_ioctl
,
4938 #ifdef CONFIG_COMPAT
4939 .compat_ioctl
= btrfs_ioctl
,
4941 .release
= btrfs_release_file
,
4942 .fsync
= btrfs_sync_file
,
4945 static struct extent_io_ops btrfs_extent_io_ops
= {
4946 .fill_delalloc
= run_delalloc_range
,
4947 .submit_bio_hook
= btrfs_submit_bio_hook
,
4948 .merge_bio_hook
= btrfs_merge_bio_hook
,
4949 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
4950 .writepage_end_io_hook
= btrfs_writepage_end_io_hook
,
4951 .writepage_start_hook
= btrfs_writepage_start_hook
,
4952 .readpage_io_failed_hook
= btrfs_io_failed_hook
,
4953 .set_bit_hook
= btrfs_set_bit_hook
,
4954 .clear_bit_hook
= btrfs_clear_bit_hook
,
4957 static struct address_space_operations btrfs_aops
= {
4958 .readpage
= btrfs_readpage
,
4959 .writepage
= btrfs_writepage
,
4960 .writepages
= btrfs_writepages
,
4961 .readpages
= btrfs_readpages
,
4962 .sync_page
= block_sync_page
,
4964 .direct_IO
= btrfs_direct_IO
,
4965 .invalidatepage
= btrfs_invalidatepage
,
4966 .releasepage
= btrfs_releasepage
,
4967 .set_page_dirty
= btrfs_set_page_dirty
,
4970 static struct address_space_operations btrfs_symlink_aops
= {
4971 .readpage
= btrfs_readpage
,
4972 .writepage
= btrfs_writepage
,
4973 .invalidatepage
= btrfs_invalidatepage
,
4974 .releasepage
= btrfs_releasepage
,
4977 static struct inode_operations btrfs_file_inode_operations
= {
4978 .truncate
= btrfs_truncate
,
4979 .getattr
= btrfs_getattr
,
4980 .setattr
= btrfs_setattr
,
4981 .setxattr
= btrfs_setxattr
,
4982 .getxattr
= btrfs_getxattr
,
4983 .listxattr
= btrfs_listxattr
,
4984 .removexattr
= btrfs_removexattr
,
4985 .permission
= btrfs_permission
,
4986 .fallocate
= btrfs_fallocate
,
4988 static struct inode_operations btrfs_special_inode_operations
= {
4989 .getattr
= btrfs_getattr
,
4990 .setattr
= btrfs_setattr
,
4991 .permission
= btrfs_permission
,
4992 .setxattr
= btrfs_setxattr
,
4993 .getxattr
= btrfs_getxattr
,
4994 .listxattr
= btrfs_listxattr
,
4995 .removexattr
= btrfs_removexattr
,
4997 static struct inode_operations btrfs_symlink_inode_operations
= {
4998 .readlink
= generic_readlink
,
4999 .follow_link
= page_follow_link_light
,
5000 .put_link
= page_put_link
,
5001 .permission
= btrfs_permission
,