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/backing-dev.h>
30 #include <linux/mpage.h>
31 #include <linux/swap.h>
32 #include <linux/writeback.h>
33 #include <linux/statfs.h>
34 #include <linux/compat.h>
35 #include <linux/bit_spinlock.h>
36 #include <linux/xattr.h>
37 #include <linux/posix_acl.h>
38 #include <linux/falloc.h>
39 #include <linux/slab.h>
40 #include <linux/ratelimit.h>
41 #include <linux/mount.h>
42 #include <linux/btrfs.h>
43 #include <linux/blkdev.h>
44 #include <linux/posix_acl_xattr.h>
45 #include <linux/uio.h>
48 #include "transaction.h"
49 #include "btrfs_inode.h"
50 #include "print-tree.h"
51 #include "ordered-data.h"
55 #include "compression.h"
57 #include "free-space-cache.h"
58 #include "inode-map.h"
64 struct btrfs_iget_args
{
65 struct btrfs_key
*location
;
66 struct btrfs_root
*root
;
69 static const struct inode_operations btrfs_dir_inode_operations
;
70 static const struct inode_operations btrfs_symlink_inode_operations
;
71 static const struct inode_operations btrfs_dir_ro_inode_operations
;
72 static const struct inode_operations btrfs_special_inode_operations
;
73 static const struct inode_operations btrfs_file_inode_operations
;
74 static const struct address_space_operations btrfs_aops
;
75 static const struct address_space_operations btrfs_symlink_aops
;
76 static const struct file_operations btrfs_dir_file_operations
;
77 static struct extent_io_ops btrfs_extent_io_ops
;
79 static struct kmem_cache
*btrfs_inode_cachep
;
80 static struct kmem_cache
*btrfs_delalloc_work_cachep
;
81 struct kmem_cache
*btrfs_trans_handle_cachep
;
82 struct kmem_cache
*btrfs_transaction_cachep
;
83 struct kmem_cache
*btrfs_path_cachep
;
84 struct kmem_cache
*btrfs_free_space_cachep
;
87 static unsigned char btrfs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
88 [S_IFREG
>> S_SHIFT
] = BTRFS_FT_REG_FILE
,
89 [S_IFDIR
>> S_SHIFT
] = BTRFS_FT_DIR
,
90 [S_IFCHR
>> S_SHIFT
] = BTRFS_FT_CHRDEV
,
91 [S_IFBLK
>> S_SHIFT
] = BTRFS_FT_BLKDEV
,
92 [S_IFIFO
>> S_SHIFT
] = BTRFS_FT_FIFO
,
93 [S_IFSOCK
>> S_SHIFT
] = BTRFS_FT_SOCK
,
94 [S_IFLNK
>> S_SHIFT
] = BTRFS_FT_SYMLINK
,
97 static int btrfs_setsize(struct inode
*inode
, struct iattr
*attr
);
98 static int btrfs_truncate(struct inode
*inode
);
99 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent
*ordered_extent
);
100 static noinline
int cow_file_range(struct inode
*inode
,
101 struct page
*locked_page
,
102 u64 start
, u64 end
, int *page_started
,
103 unsigned long *nr_written
, int unlock
);
104 static struct extent_map
*create_pinned_em(struct inode
*inode
, u64 start
,
105 u64 len
, u64 orig_start
,
106 u64 block_start
, u64 block_len
,
107 u64 orig_block_len
, u64 ram_bytes
,
110 static int btrfs_dirty_inode(struct inode
*inode
);
112 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
113 void btrfs_test_inode_set_ops(struct inode
*inode
)
115 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
119 static int btrfs_init_inode_security(struct btrfs_trans_handle
*trans
,
120 struct inode
*inode
, struct inode
*dir
,
121 const struct qstr
*qstr
)
125 err
= btrfs_init_acl(trans
, inode
, dir
);
127 err
= btrfs_xattr_security_init(trans
, inode
, dir
, qstr
);
132 * this does all the hard work for inserting an inline extent into
133 * the btree. The caller should have done a btrfs_drop_extents so that
134 * no overlapping inline items exist in the btree
136 static int insert_inline_extent(struct btrfs_trans_handle
*trans
,
137 struct btrfs_path
*path
, int extent_inserted
,
138 struct btrfs_root
*root
, struct inode
*inode
,
139 u64 start
, size_t size
, size_t compressed_size
,
141 struct page
**compressed_pages
)
143 struct extent_buffer
*leaf
;
144 struct page
*page
= NULL
;
147 struct btrfs_file_extent_item
*ei
;
150 size_t cur_size
= size
;
151 unsigned long offset
;
153 if (compressed_size
&& compressed_pages
)
154 cur_size
= compressed_size
;
156 inode_add_bytes(inode
, size
);
158 if (!extent_inserted
) {
159 struct btrfs_key key
;
162 key
.objectid
= btrfs_ino(inode
);
164 key
.type
= BTRFS_EXTENT_DATA_KEY
;
166 datasize
= btrfs_file_extent_calc_inline_size(cur_size
);
167 path
->leave_spinning
= 1;
168 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
175 leaf
= path
->nodes
[0];
176 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
177 struct btrfs_file_extent_item
);
178 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
179 btrfs_set_file_extent_type(leaf
, ei
, BTRFS_FILE_EXTENT_INLINE
);
180 btrfs_set_file_extent_encryption(leaf
, ei
, 0);
181 btrfs_set_file_extent_other_encoding(leaf
, ei
, 0);
182 btrfs_set_file_extent_ram_bytes(leaf
, ei
, size
);
183 ptr
= btrfs_file_extent_inline_start(ei
);
185 if (compress_type
!= BTRFS_COMPRESS_NONE
) {
188 while (compressed_size
> 0) {
189 cpage
= compressed_pages
[i
];
190 cur_size
= min_t(unsigned long, compressed_size
,
193 kaddr
= kmap_atomic(cpage
);
194 write_extent_buffer(leaf
, kaddr
, ptr
, cur_size
);
195 kunmap_atomic(kaddr
);
199 compressed_size
-= cur_size
;
201 btrfs_set_file_extent_compression(leaf
, ei
,
204 page
= find_get_page(inode
->i_mapping
,
205 start
>> PAGE_CACHE_SHIFT
);
206 btrfs_set_file_extent_compression(leaf
, ei
, 0);
207 kaddr
= kmap_atomic(page
);
208 offset
= start
& (PAGE_CACHE_SIZE
- 1);
209 write_extent_buffer(leaf
, kaddr
+ offset
, ptr
, size
);
210 kunmap_atomic(kaddr
);
211 page_cache_release(page
);
213 btrfs_mark_buffer_dirty(leaf
);
214 btrfs_release_path(path
);
217 * we're an inline extent, so nobody can
218 * extend the file past i_size without locking
219 * a page we already have locked.
221 * We must do any isize and inode updates
222 * before we unlock the pages. Otherwise we
223 * could end up racing with unlink.
225 BTRFS_I(inode
)->disk_i_size
= inode
->i_size
;
226 ret
= btrfs_update_inode(trans
, root
, inode
);
235 * conditionally insert an inline extent into the file. This
236 * does the checks required to make sure the data is small enough
237 * to fit as an inline extent.
239 static noinline
int cow_file_range_inline(struct btrfs_root
*root
,
240 struct inode
*inode
, u64 start
,
241 u64 end
, size_t compressed_size
,
243 struct page
**compressed_pages
)
245 struct btrfs_trans_handle
*trans
;
246 u64 isize
= i_size_read(inode
);
247 u64 actual_end
= min(end
+ 1, isize
);
248 u64 inline_len
= actual_end
- start
;
249 u64 aligned_end
= ALIGN(end
, root
->sectorsize
);
250 u64 data_len
= inline_len
;
252 struct btrfs_path
*path
;
253 int extent_inserted
= 0;
254 u32 extent_item_size
;
257 data_len
= compressed_size
;
260 actual_end
> PAGE_CACHE_SIZE
||
261 data_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
) ||
263 (actual_end
& (root
->sectorsize
- 1)) == 0) ||
265 data_len
> root
->fs_info
->max_inline
) {
269 path
= btrfs_alloc_path();
273 trans
= btrfs_join_transaction(root
);
275 btrfs_free_path(path
);
276 return PTR_ERR(trans
);
278 trans
->block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
280 if (compressed_size
&& compressed_pages
)
281 extent_item_size
= btrfs_file_extent_calc_inline_size(
284 extent_item_size
= btrfs_file_extent_calc_inline_size(
287 ret
= __btrfs_drop_extents(trans
, root
, inode
, path
,
288 start
, aligned_end
, NULL
,
289 1, 1, extent_item_size
, &extent_inserted
);
291 btrfs_abort_transaction(trans
, root
, ret
);
295 if (isize
> actual_end
)
296 inline_len
= min_t(u64
, isize
, actual_end
);
297 ret
= insert_inline_extent(trans
, path
, extent_inserted
,
299 inline_len
, compressed_size
,
300 compress_type
, compressed_pages
);
301 if (ret
&& ret
!= -ENOSPC
) {
302 btrfs_abort_transaction(trans
, root
, ret
);
304 } else if (ret
== -ENOSPC
) {
309 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &BTRFS_I(inode
)->runtime_flags
);
310 btrfs_delalloc_release_metadata(inode
, end
+ 1 - start
);
311 btrfs_drop_extent_cache(inode
, start
, aligned_end
- 1, 0);
313 btrfs_free_path(path
);
314 btrfs_end_transaction(trans
, root
);
318 struct async_extent
{
323 unsigned long nr_pages
;
325 struct list_head list
;
330 struct btrfs_root
*root
;
331 struct page
*locked_page
;
334 struct list_head extents
;
335 struct btrfs_work work
;
338 static noinline
int add_async_extent(struct async_cow
*cow
,
339 u64 start
, u64 ram_size
,
342 unsigned long nr_pages
,
345 struct async_extent
*async_extent
;
347 async_extent
= kmalloc(sizeof(*async_extent
), GFP_NOFS
);
348 BUG_ON(!async_extent
); /* -ENOMEM */
349 async_extent
->start
= start
;
350 async_extent
->ram_size
= ram_size
;
351 async_extent
->compressed_size
= compressed_size
;
352 async_extent
->pages
= pages
;
353 async_extent
->nr_pages
= nr_pages
;
354 async_extent
->compress_type
= compress_type
;
355 list_add_tail(&async_extent
->list
, &cow
->extents
);
359 static inline int inode_need_compress(struct inode
*inode
)
361 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
364 if (btrfs_test_opt(root
, FORCE_COMPRESS
))
366 /* bad compression ratios */
367 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NOCOMPRESS
)
369 if (btrfs_test_opt(root
, COMPRESS
) ||
370 BTRFS_I(inode
)->flags
& BTRFS_INODE_COMPRESS
||
371 BTRFS_I(inode
)->force_compress
)
377 * we create compressed extents in two phases. The first
378 * phase compresses a range of pages that have already been
379 * locked (both pages and state bits are locked).
381 * This is done inside an ordered work queue, and the compression
382 * is spread across many cpus. The actual IO submission is step
383 * two, and the ordered work queue takes care of making sure that
384 * happens in the same order things were put onto the queue by
385 * writepages and friends.
387 * If this code finds it can't get good compression, it puts an
388 * entry onto the work queue to write the uncompressed bytes. This
389 * makes sure that both compressed inodes and uncompressed inodes
390 * are written in the same order that the flusher thread sent them
393 static noinline
void compress_file_range(struct inode
*inode
,
394 struct page
*locked_page
,
396 struct async_cow
*async_cow
,
399 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
401 u64 blocksize
= root
->sectorsize
;
403 u64 isize
= i_size_read(inode
);
405 struct page
**pages
= NULL
;
406 unsigned long nr_pages
;
407 unsigned long nr_pages_ret
= 0;
408 unsigned long total_compressed
= 0;
409 unsigned long total_in
= 0;
410 unsigned long max_compressed
= 128 * 1024;
411 unsigned long max_uncompressed
= 128 * 1024;
414 int compress_type
= root
->fs_info
->compress_type
;
417 /* if this is a small write inside eof, kick off a defrag */
418 if ((end
- start
+ 1) < 16 * 1024 &&
419 (start
> 0 || end
+ 1 < BTRFS_I(inode
)->disk_i_size
))
420 btrfs_add_inode_defrag(NULL
, inode
);
422 actual_end
= min_t(u64
, isize
, end
+ 1);
425 nr_pages
= (end
>> PAGE_CACHE_SHIFT
) - (start
>> PAGE_CACHE_SHIFT
) + 1;
426 nr_pages
= min(nr_pages
, (128 * 1024UL) / PAGE_CACHE_SIZE
);
429 * we don't want to send crud past the end of i_size through
430 * compression, that's just a waste of CPU time. So, if the
431 * end of the file is before the start of our current
432 * requested range of bytes, we bail out to the uncompressed
433 * cleanup code that can deal with all of this.
435 * It isn't really the fastest way to fix things, but this is a
436 * very uncommon corner.
438 if (actual_end
<= start
)
439 goto cleanup_and_bail_uncompressed
;
441 total_compressed
= actual_end
- start
;
444 * skip compression for a small file range(<=blocksize) that
445 * isn't an inline extent, since it dosen't save disk space at all.
447 if (total_compressed
<= blocksize
&&
448 (start
> 0 || end
+ 1 < BTRFS_I(inode
)->disk_i_size
))
449 goto cleanup_and_bail_uncompressed
;
451 /* we want to make sure that amount of ram required to uncompress
452 * an extent is reasonable, so we limit the total size in ram
453 * of a compressed extent to 128k. This is a crucial number
454 * because it also controls how easily we can spread reads across
455 * cpus for decompression.
457 * We also want to make sure the amount of IO required to do
458 * a random read is reasonably small, so we limit the size of
459 * a compressed extent to 128k.
461 total_compressed
= min(total_compressed
, max_uncompressed
);
462 num_bytes
= ALIGN(end
- start
+ 1, blocksize
);
463 num_bytes
= max(blocksize
, num_bytes
);
468 * we do compression for mount -o compress and when the
469 * inode has not been flagged as nocompress. This flag can
470 * change at any time if we discover bad compression ratios.
472 if (inode_need_compress(inode
)) {
474 pages
= kcalloc(nr_pages
, sizeof(struct page
*), GFP_NOFS
);
476 /* just bail out to the uncompressed code */
480 if (BTRFS_I(inode
)->force_compress
)
481 compress_type
= BTRFS_I(inode
)->force_compress
;
484 * we need to call clear_page_dirty_for_io on each
485 * page in the range. Otherwise applications with the file
486 * mmap'd can wander in and change the page contents while
487 * we are compressing them.
489 * If the compression fails for any reason, we set the pages
490 * dirty again later on.
492 extent_range_clear_dirty_for_io(inode
, start
, end
);
494 ret
= btrfs_compress_pages(compress_type
,
495 inode
->i_mapping
, start
,
496 total_compressed
, pages
,
497 nr_pages
, &nr_pages_ret
,
503 unsigned long offset
= total_compressed
&
504 (PAGE_CACHE_SIZE
- 1);
505 struct page
*page
= pages
[nr_pages_ret
- 1];
508 /* zero the tail end of the last page, we might be
509 * sending it down to disk
512 kaddr
= kmap_atomic(page
);
513 memset(kaddr
+ offset
, 0,
514 PAGE_CACHE_SIZE
- offset
);
515 kunmap_atomic(kaddr
);
522 /* lets try to make an inline extent */
523 if (ret
|| total_in
< (actual_end
- start
)) {
524 /* we didn't compress the entire range, try
525 * to make an uncompressed inline extent.
527 ret
= cow_file_range_inline(root
, inode
, start
, end
,
530 /* try making a compressed inline extent */
531 ret
= cow_file_range_inline(root
, inode
, start
, end
,
533 compress_type
, pages
);
536 unsigned long clear_flags
= EXTENT_DELALLOC
|
538 unsigned long page_error_op
;
540 clear_flags
|= (ret
< 0) ? EXTENT_DO_ACCOUNTING
: 0;
541 page_error_op
= ret
< 0 ? PAGE_SET_ERROR
: 0;
544 * inline extent creation worked or returned error,
545 * we don't need to create any more async work items.
546 * Unlock and free up our temp pages.
548 extent_clear_unlock_delalloc(inode
, start
, end
, NULL
,
549 clear_flags
, PAGE_UNLOCK
|
560 * we aren't doing an inline extent round the compressed size
561 * up to a block size boundary so the allocator does sane
564 total_compressed
= ALIGN(total_compressed
, blocksize
);
567 * one last check to make sure the compression is really a
568 * win, compare the page count read with the blocks on disk
570 total_in
= ALIGN(total_in
, PAGE_CACHE_SIZE
);
571 if (total_compressed
>= total_in
) {
574 num_bytes
= total_in
;
577 if (!will_compress
&& pages
) {
579 * the compression code ran but failed to make things smaller,
580 * free any pages it allocated and our page pointer array
582 for (i
= 0; i
< nr_pages_ret
; i
++) {
583 WARN_ON(pages
[i
]->mapping
);
584 page_cache_release(pages
[i
]);
588 total_compressed
= 0;
591 /* flag the file so we don't compress in the future */
592 if (!btrfs_test_opt(root
, FORCE_COMPRESS
) &&
593 !(BTRFS_I(inode
)->force_compress
)) {
594 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NOCOMPRESS
;
600 /* the async work queues will take care of doing actual
601 * allocation on disk for these compressed pages,
602 * and will submit them to the elevator.
604 add_async_extent(async_cow
, start
, num_bytes
,
605 total_compressed
, pages
, nr_pages_ret
,
608 if (start
+ num_bytes
< end
) {
615 cleanup_and_bail_uncompressed
:
617 * No compression, but we still need to write the pages in
618 * the file we've been given so far. redirty the locked
619 * page if it corresponds to our extent and set things up
620 * for the async work queue to run cow_file_range to do
621 * the normal delalloc dance
623 if (page_offset(locked_page
) >= start
&&
624 page_offset(locked_page
) <= end
) {
625 __set_page_dirty_nobuffers(locked_page
);
626 /* unlocked later on in the async handlers */
629 extent_range_redirty_for_io(inode
, start
, end
);
630 add_async_extent(async_cow
, start
, end
- start
+ 1,
631 0, NULL
, 0, BTRFS_COMPRESS_NONE
);
638 for (i
= 0; i
< nr_pages_ret
; i
++) {
639 WARN_ON(pages
[i
]->mapping
);
640 page_cache_release(pages
[i
]);
645 static void free_async_extent_pages(struct async_extent
*async_extent
)
649 if (!async_extent
->pages
)
652 for (i
= 0; i
< async_extent
->nr_pages
; i
++) {
653 WARN_ON(async_extent
->pages
[i
]->mapping
);
654 page_cache_release(async_extent
->pages
[i
]);
656 kfree(async_extent
->pages
);
657 async_extent
->nr_pages
= 0;
658 async_extent
->pages
= NULL
;
662 * phase two of compressed writeback. This is the ordered portion
663 * of the code, which only gets called in the order the work was
664 * queued. We walk all the async extents created by compress_file_range
665 * and send them down to the disk.
667 static noinline
void submit_compressed_extents(struct inode
*inode
,
668 struct async_cow
*async_cow
)
670 struct async_extent
*async_extent
;
672 struct btrfs_key ins
;
673 struct extent_map
*em
;
674 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
675 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
676 struct extent_io_tree
*io_tree
;
680 while (!list_empty(&async_cow
->extents
)) {
681 async_extent
= list_entry(async_cow
->extents
.next
,
682 struct async_extent
, list
);
683 list_del(&async_extent
->list
);
685 io_tree
= &BTRFS_I(inode
)->io_tree
;
688 /* did the compression code fall back to uncompressed IO? */
689 if (!async_extent
->pages
) {
690 int page_started
= 0;
691 unsigned long nr_written
= 0;
693 lock_extent(io_tree
, async_extent
->start
,
694 async_extent
->start
+
695 async_extent
->ram_size
- 1);
697 /* allocate blocks */
698 ret
= cow_file_range(inode
, async_cow
->locked_page
,
700 async_extent
->start
+
701 async_extent
->ram_size
- 1,
702 &page_started
, &nr_written
, 0);
707 * if page_started, cow_file_range inserted an
708 * inline extent and took care of all the unlocking
709 * and IO for us. Otherwise, we need to submit
710 * all those pages down to the drive.
712 if (!page_started
&& !ret
)
713 extent_write_locked_range(io_tree
,
714 inode
, async_extent
->start
,
715 async_extent
->start
+
716 async_extent
->ram_size
- 1,
720 unlock_page(async_cow
->locked_page
);
726 lock_extent(io_tree
, async_extent
->start
,
727 async_extent
->start
+ async_extent
->ram_size
- 1);
729 ret
= btrfs_reserve_extent(root
,
730 async_extent
->compressed_size
,
731 async_extent
->compressed_size
,
732 0, alloc_hint
, &ins
, 1, 1);
734 free_async_extent_pages(async_extent
);
736 if (ret
== -ENOSPC
) {
737 unlock_extent(io_tree
, async_extent
->start
,
738 async_extent
->start
+
739 async_extent
->ram_size
- 1);
742 * we need to redirty the pages if we decide to
743 * fallback to uncompressed IO, otherwise we
744 * will not submit these pages down to lower
747 extent_range_redirty_for_io(inode
,
749 async_extent
->start
+
750 async_extent
->ram_size
- 1);
757 * here we're doing allocation and writeback of the
760 btrfs_drop_extent_cache(inode
, async_extent
->start
,
761 async_extent
->start
+
762 async_extent
->ram_size
- 1, 0);
764 em
= alloc_extent_map();
767 goto out_free_reserve
;
769 em
->start
= async_extent
->start
;
770 em
->len
= async_extent
->ram_size
;
771 em
->orig_start
= em
->start
;
772 em
->mod_start
= em
->start
;
773 em
->mod_len
= em
->len
;
775 em
->block_start
= ins
.objectid
;
776 em
->block_len
= ins
.offset
;
777 em
->orig_block_len
= ins
.offset
;
778 em
->ram_bytes
= async_extent
->ram_size
;
779 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
780 em
->compress_type
= async_extent
->compress_type
;
781 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
782 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
786 write_lock(&em_tree
->lock
);
787 ret
= add_extent_mapping(em_tree
, em
, 1);
788 write_unlock(&em_tree
->lock
);
789 if (ret
!= -EEXIST
) {
793 btrfs_drop_extent_cache(inode
, async_extent
->start
,
794 async_extent
->start
+
795 async_extent
->ram_size
- 1, 0);
799 goto out_free_reserve
;
801 ret
= btrfs_add_ordered_extent_compress(inode
,
804 async_extent
->ram_size
,
806 BTRFS_ORDERED_COMPRESSED
,
807 async_extent
->compress_type
);
809 btrfs_drop_extent_cache(inode
, async_extent
->start
,
810 async_extent
->start
+
811 async_extent
->ram_size
- 1, 0);
812 goto out_free_reserve
;
816 * clear dirty, set writeback and unlock the pages.
818 extent_clear_unlock_delalloc(inode
, async_extent
->start
,
819 async_extent
->start
+
820 async_extent
->ram_size
- 1,
821 NULL
, EXTENT_LOCKED
| EXTENT_DELALLOC
,
822 PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
|
824 ret
= btrfs_submit_compressed_write(inode
,
826 async_extent
->ram_size
,
828 ins
.offset
, async_extent
->pages
,
829 async_extent
->nr_pages
);
831 struct extent_io_tree
*tree
= &BTRFS_I(inode
)->io_tree
;
832 struct page
*p
= async_extent
->pages
[0];
833 const u64 start
= async_extent
->start
;
834 const u64 end
= start
+ async_extent
->ram_size
- 1;
836 p
->mapping
= inode
->i_mapping
;
837 tree
->ops
->writepage_end_io_hook(p
, start
, end
,
840 extent_clear_unlock_delalloc(inode
, start
, end
, NULL
, 0,
843 free_async_extent_pages(async_extent
);
845 alloc_hint
= ins
.objectid
+ ins
.offset
;
851 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
, 1);
853 extent_clear_unlock_delalloc(inode
, async_extent
->start
,
854 async_extent
->start
+
855 async_extent
->ram_size
- 1,
856 NULL
, EXTENT_LOCKED
| EXTENT_DELALLOC
|
857 EXTENT_DEFRAG
| EXTENT_DO_ACCOUNTING
,
858 PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
|
859 PAGE_SET_WRITEBACK
| PAGE_END_WRITEBACK
|
861 free_async_extent_pages(async_extent
);
866 static u64
get_extent_allocation_hint(struct inode
*inode
, u64 start
,
869 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
870 struct extent_map
*em
;
873 read_lock(&em_tree
->lock
);
874 em
= search_extent_mapping(em_tree
, start
, num_bytes
);
877 * if block start isn't an actual block number then find the
878 * first block in this inode and use that as a hint. If that
879 * block is also bogus then just don't worry about it.
881 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
883 em
= search_extent_mapping(em_tree
, 0, 0);
884 if (em
&& em
->block_start
< EXTENT_MAP_LAST_BYTE
)
885 alloc_hint
= em
->block_start
;
889 alloc_hint
= em
->block_start
;
893 read_unlock(&em_tree
->lock
);
899 * when extent_io.c finds a delayed allocation range in the file,
900 * the call backs end up in this code. The basic idea is to
901 * allocate extents on disk for the range, and create ordered data structs
902 * in ram to track those extents.
904 * locked_page is the page that writepage had locked already. We use
905 * it to make sure we don't do extra locks or unlocks.
907 * *page_started is set to one if we unlock locked_page and do everything
908 * required to start IO on it. It may be clean and already done with
911 static noinline
int cow_file_range(struct inode
*inode
,
912 struct page
*locked_page
,
913 u64 start
, u64 end
, int *page_started
,
914 unsigned long *nr_written
,
917 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
920 unsigned long ram_size
;
923 u64 blocksize
= root
->sectorsize
;
924 struct btrfs_key ins
;
925 struct extent_map
*em
;
926 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
929 if (btrfs_is_free_space_inode(inode
)) {
935 num_bytes
= ALIGN(end
- start
+ 1, blocksize
);
936 num_bytes
= max(blocksize
, num_bytes
);
937 disk_num_bytes
= num_bytes
;
939 /* if this is a small write inside eof, kick off defrag */
940 if (num_bytes
< 64 * 1024 &&
941 (start
> 0 || end
+ 1 < BTRFS_I(inode
)->disk_i_size
))
942 btrfs_add_inode_defrag(NULL
, inode
);
945 /* lets try to make an inline extent */
946 ret
= cow_file_range_inline(root
, inode
, start
, end
, 0, 0,
949 extent_clear_unlock_delalloc(inode
, start
, end
, NULL
,
950 EXTENT_LOCKED
| EXTENT_DELALLOC
|
951 EXTENT_DEFRAG
, PAGE_UNLOCK
|
952 PAGE_CLEAR_DIRTY
| PAGE_SET_WRITEBACK
|
955 *nr_written
= *nr_written
+
956 (end
- start
+ PAGE_CACHE_SIZE
) / PAGE_CACHE_SIZE
;
959 } else if (ret
< 0) {
964 BUG_ON(disk_num_bytes
>
965 btrfs_super_total_bytes(root
->fs_info
->super_copy
));
967 alloc_hint
= get_extent_allocation_hint(inode
, start
, num_bytes
);
968 btrfs_drop_extent_cache(inode
, start
, start
+ num_bytes
- 1, 0);
970 while (disk_num_bytes
> 0) {
973 cur_alloc_size
= disk_num_bytes
;
974 ret
= btrfs_reserve_extent(root
, cur_alloc_size
,
975 root
->sectorsize
, 0, alloc_hint
,
980 em
= alloc_extent_map();
986 em
->orig_start
= em
->start
;
987 ram_size
= ins
.offset
;
988 em
->len
= ins
.offset
;
989 em
->mod_start
= em
->start
;
990 em
->mod_len
= em
->len
;
992 em
->block_start
= ins
.objectid
;
993 em
->block_len
= ins
.offset
;
994 em
->orig_block_len
= ins
.offset
;
995 em
->ram_bytes
= ram_size
;
996 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
997 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
1001 write_lock(&em_tree
->lock
);
1002 ret
= add_extent_mapping(em_tree
, em
, 1);
1003 write_unlock(&em_tree
->lock
);
1004 if (ret
!= -EEXIST
) {
1005 free_extent_map(em
);
1008 btrfs_drop_extent_cache(inode
, start
,
1009 start
+ ram_size
- 1, 0);
1014 cur_alloc_size
= ins
.offset
;
1015 ret
= btrfs_add_ordered_extent(inode
, start
, ins
.objectid
,
1016 ram_size
, cur_alloc_size
, 0);
1018 goto out_drop_extent_cache
;
1020 if (root
->root_key
.objectid
==
1021 BTRFS_DATA_RELOC_TREE_OBJECTID
) {
1022 ret
= btrfs_reloc_clone_csums(inode
, start
,
1025 goto out_drop_extent_cache
;
1028 if (disk_num_bytes
< cur_alloc_size
)
1031 /* we're not doing compressed IO, don't unlock the first
1032 * page (which the caller expects to stay locked), don't
1033 * clear any dirty bits and don't set any writeback bits
1035 * Do set the Private2 bit so we know this page was properly
1036 * setup for writepage
1038 op
= unlock
? PAGE_UNLOCK
: 0;
1039 op
|= PAGE_SET_PRIVATE2
;
1041 extent_clear_unlock_delalloc(inode
, start
,
1042 start
+ ram_size
- 1, locked_page
,
1043 EXTENT_LOCKED
| EXTENT_DELALLOC
,
1045 disk_num_bytes
-= cur_alloc_size
;
1046 num_bytes
-= cur_alloc_size
;
1047 alloc_hint
= ins
.objectid
+ ins
.offset
;
1048 start
+= cur_alloc_size
;
1053 out_drop_extent_cache
:
1054 btrfs_drop_extent_cache(inode
, start
, start
+ ram_size
- 1, 0);
1056 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
, 1);
1058 extent_clear_unlock_delalloc(inode
, start
, end
, locked_page
,
1059 EXTENT_LOCKED
| EXTENT_DO_ACCOUNTING
|
1060 EXTENT_DELALLOC
| EXTENT_DEFRAG
,
1061 PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
|
1062 PAGE_SET_WRITEBACK
| PAGE_END_WRITEBACK
);
1067 * work queue call back to started compression on a file and pages
1069 static noinline
void async_cow_start(struct btrfs_work
*work
)
1071 struct async_cow
*async_cow
;
1073 async_cow
= container_of(work
, struct async_cow
, work
);
1075 compress_file_range(async_cow
->inode
, async_cow
->locked_page
,
1076 async_cow
->start
, async_cow
->end
, async_cow
,
1078 if (num_added
== 0) {
1079 btrfs_add_delayed_iput(async_cow
->inode
);
1080 async_cow
->inode
= NULL
;
1085 * work queue call back to submit previously compressed pages
1087 static noinline
void async_cow_submit(struct btrfs_work
*work
)
1089 struct async_cow
*async_cow
;
1090 struct btrfs_root
*root
;
1091 unsigned long nr_pages
;
1093 async_cow
= container_of(work
, struct async_cow
, work
);
1095 root
= async_cow
->root
;
1096 nr_pages
= (async_cow
->end
- async_cow
->start
+ PAGE_CACHE_SIZE
) >>
1099 if (atomic_sub_return(nr_pages
, &root
->fs_info
->async_delalloc_pages
) <
1101 waitqueue_active(&root
->fs_info
->async_submit_wait
))
1102 wake_up(&root
->fs_info
->async_submit_wait
);
1104 if (async_cow
->inode
)
1105 submit_compressed_extents(async_cow
->inode
, async_cow
);
1108 static noinline
void async_cow_free(struct btrfs_work
*work
)
1110 struct async_cow
*async_cow
;
1111 async_cow
= container_of(work
, struct async_cow
, work
);
1112 if (async_cow
->inode
)
1113 btrfs_add_delayed_iput(async_cow
->inode
);
1117 static int cow_file_range_async(struct inode
*inode
, struct page
*locked_page
,
1118 u64 start
, u64 end
, int *page_started
,
1119 unsigned long *nr_written
)
1121 struct async_cow
*async_cow
;
1122 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1123 unsigned long nr_pages
;
1125 int limit
= 10 * 1024 * 1024;
1127 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, start
, end
, EXTENT_LOCKED
,
1128 1, 0, NULL
, GFP_NOFS
);
1129 while (start
< end
) {
1130 async_cow
= kmalloc(sizeof(*async_cow
), GFP_NOFS
);
1131 BUG_ON(!async_cow
); /* -ENOMEM */
1132 async_cow
->inode
= igrab(inode
);
1133 async_cow
->root
= root
;
1134 async_cow
->locked_page
= locked_page
;
1135 async_cow
->start
= start
;
1137 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NOCOMPRESS
&&
1138 !btrfs_test_opt(root
, FORCE_COMPRESS
))
1141 cur_end
= min(end
, start
+ 512 * 1024 - 1);
1143 async_cow
->end
= cur_end
;
1144 INIT_LIST_HEAD(&async_cow
->extents
);
1146 btrfs_init_work(&async_cow
->work
,
1147 btrfs_delalloc_helper
,
1148 async_cow_start
, async_cow_submit
,
1151 nr_pages
= (cur_end
- start
+ PAGE_CACHE_SIZE
) >>
1153 atomic_add(nr_pages
, &root
->fs_info
->async_delalloc_pages
);
1155 btrfs_queue_work(root
->fs_info
->delalloc_workers
,
1158 if (atomic_read(&root
->fs_info
->async_delalloc_pages
) > limit
) {
1159 wait_event(root
->fs_info
->async_submit_wait
,
1160 (atomic_read(&root
->fs_info
->async_delalloc_pages
) <
1164 while (atomic_read(&root
->fs_info
->async_submit_draining
) &&
1165 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
1166 wait_event(root
->fs_info
->async_submit_wait
,
1167 (atomic_read(&root
->fs_info
->async_delalloc_pages
) ==
1171 *nr_written
+= nr_pages
;
1172 start
= cur_end
+ 1;
1178 static noinline
int csum_exist_in_range(struct btrfs_root
*root
,
1179 u64 bytenr
, u64 num_bytes
)
1182 struct btrfs_ordered_sum
*sums
;
1185 ret
= btrfs_lookup_csums_range(root
->fs_info
->csum_root
, bytenr
,
1186 bytenr
+ num_bytes
- 1, &list
, 0);
1187 if (ret
== 0 && list_empty(&list
))
1190 while (!list_empty(&list
)) {
1191 sums
= list_entry(list
.next
, struct btrfs_ordered_sum
, list
);
1192 list_del(&sums
->list
);
1199 * when nowcow writeback call back. This checks for snapshots or COW copies
1200 * of the extents that exist in the file, and COWs the file as required.
1202 * If no cow copies or snapshots exist, we write directly to the existing
1205 static noinline
int run_delalloc_nocow(struct inode
*inode
,
1206 struct page
*locked_page
,
1207 u64 start
, u64 end
, int *page_started
, int force
,
1208 unsigned long *nr_written
)
1210 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1211 struct btrfs_trans_handle
*trans
;
1212 struct extent_buffer
*leaf
;
1213 struct btrfs_path
*path
;
1214 struct btrfs_file_extent_item
*fi
;
1215 struct btrfs_key found_key
;
1230 u64 ino
= btrfs_ino(inode
);
1232 path
= btrfs_alloc_path();
1234 extent_clear_unlock_delalloc(inode
, start
, end
, locked_page
,
1235 EXTENT_LOCKED
| EXTENT_DELALLOC
|
1236 EXTENT_DO_ACCOUNTING
|
1237 EXTENT_DEFRAG
, PAGE_UNLOCK
|
1239 PAGE_SET_WRITEBACK
|
1240 PAGE_END_WRITEBACK
);
1244 nolock
= btrfs_is_free_space_inode(inode
);
1247 trans
= btrfs_join_transaction_nolock(root
);
1249 trans
= btrfs_join_transaction(root
);
1251 if (IS_ERR(trans
)) {
1252 extent_clear_unlock_delalloc(inode
, start
, end
, locked_page
,
1253 EXTENT_LOCKED
| EXTENT_DELALLOC
|
1254 EXTENT_DO_ACCOUNTING
|
1255 EXTENT_DEFRAG
, PAGE_UNLOCK
|
1257 PAGE_SET_WRITEBACK
|
1258 PAGE_END_WRITEBACK
);
1259 btrfs_free_path(path
);
1260 return PTR_ERR(trans
);
1263 trans
->block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
1265 cow_start
= (u64
)-1;
1268 ret
= btrfs_lookup_file_extent(trans
, root
, path
, ino
,
1272 if (ret
> 0 && path
->slots
[0] > 0 && check_prev
) {
1273 leaf
= path
->nodes
[0];
1274 btrfs_item_key_to_cpu(leaf
, &found_key
,
1275 path
->slots
[0] - 1);
1276 if (found_key
.objectid
== ino
&&
1277 found_key
.type
== BTRFS_EXTENT_DATA_KEY
)
1282 leaf
= path
->nodes
[0];
1283 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
1284 ret
= btrfs_next_leaf(root
, path
);
1289 leaf
= path
->nodes
[0];
1295 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1297 if (found_key
.objectid
> ino
||
1298 found_key
.type
> BTRFS_EXTENT_DATA_KEY
||
1299 found_key
.offset
> end
)
1302 if (found_key
.offset
> cur_offset
) {
1303 extent_end
= found_key
.offset
;
1308 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
1309 struct btrfs_file_extent_item
);
1310 extent_type
= btrfs_file_extent_type(leaf
, fi
);
1312 ram_bytes
= btrfs_file_extent_ram_bytes(leaf
, fi
);
1313 if (extent_type
== BTRFS_FILE_EXTENT_REG
||
1314 extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1315 disk_bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
1316 extent_offset
= btrfs_file_extent_offset(leaf
, fi
);
1317 extent_end
= found_key
.offset
+
1318 btrfs_file_extent_num_bytes(leaf
, fi
);
1320 btrfs_file_extent_disk_num_bytes(leaf
, fi
);
1321 if (extent_end
<= start
) {
1325 if (disk_bytenr
== 0)
1327 if (btrfs_file_extent_compression(leaf
, fi
) ||
1328 btrfs_file_extent_encryption(leaf
, fi
) ||
1329 btrfs_file_extent_other_encoding(leaf
, fi
))
1331 if (extent_type
== BTRFS_FILE_EXTENT_REG
&& !force
)
1333 if (btrfs_extent_readonly(root
, disk_bytenr
))
1335 if (btrfs_cross_ref_exist(trans
, root
, ino
,
1337 extent_offset
, disk_bytenr
))
1339 disk_bytenr
+= extent_offset
;
1340 disk_bytenr
+= cur_offset
- found_key
.offset
;
1341 num_bytes
= min(end
+ 1, extent_end
) - cur_offset
;
1343 * if there are pending snapshots for this root,
1344 * we fall into common COW way.
1347 err
= btrfs_start_write_no_snapshoting(root
);
1352 * force cow if csum exists in the range.
1353 * this ensure that csum for a given extent are
1354 * either valid or do not exist.
1356 if (csum_exist_in_range(root
, disk_bytenr
, num_bytes
))
1359 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
1360 extent_end
= found_key
.offset
+
1361 btrfs_file_extent_inline_len(leaf
,
1362 path
->slots
[0], fi
);
1363 extent_end
= ALIGN(extent_end
, root
->sectorsize
);
1368 if (extent_end
<= start
) {
1370 if (!nolock
&& nocow
)
1371 btrfs_end_write_no_snapshoting(root
);
1375 if (cow_start
== (u64
)-1)
1376 cow_start
= cur_offset
;
1377 cur_offset
= extent_end
;
1378 if (cur_offset
> end
)
1384 btrfs_release_path(path
);
1385 if (cow_start
!= (u64
)-1) {
1386 ret
= cow_file_range(inode
, locked_page
,
1387 cow_start
, found_key
.offset
- 1,
1388 page_started
, nr_written
, 1);
1390 if (!nolock
&& nocow
)
1391 btrfs_end_write_no_snapshoting(root
);
1394 cow_start
= (u64
)-1;
1397 if (extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1398 struct extent_map
*em
;
1399 struct extent_map_tree
*em_tree
;
1400 em_tree
= &BTRFS_I(inode
)->extent_tree
;
1401 em
= alloc_extent_map();
1402 BUG_ON(!em
); /* -ENOMEM */
1403 em
->start
= cur_offset
;
1404 em
->orig_start
= found_key
.offset
- extent_offset
;
1405 em
->len
= num_bytes
;
1406 em
->block_len
= num_bytes
;
1407 em
->block_start
= disk_bytenr
;
1408 em
->orig_block_len
= disk_num_bytes
;
1409 em
->ram_bytes
= ram_bytes
;
1410 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
1411 em
->mod_start
= em
->start
;
1412 em
->mod_len
= em
->len
;
1413 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
1414 set_bit(EXTENT_FLAG_FILLING
, &em
->flags
);
1415 em
->generation
= -1;
1417 write_lock(&em_tree
->lock
);
1418 ret
= add_extent_mapping(em_tree
, em
, 1);
1419 write_unlock(&em_tree
->lock
);
1420 if (ret
!= -EEXIST
) {
1421 free_extent_map(em
);
1424 btrfs_drop_extent_cache(inode
, em
->start
,
1425 em
->start
+ em
->len
- 1, 0);
1427 type
= BTRFS_ORDERED_PREALLOC
;
1429 type
= BTRFS_ORDERED_NOCOW
;
1432 ret
= btrfs_add_ordered_extent(inode
, cur_offset
, disk_bytenr
,
1433 num_bytes
, num_bytes
, type
);
1434 BUG_ON(ret
); /* -ENOMEM */
1436 if (root
->root_key
.objectid
==
1437 BTRFS_DATA_RELOC_TREE_OBJECTID
) {
1438 ret
= btrfs_reloc_clone_csums(inode
, cur_offset
,
1441 if (!nolock
&& nocow
)
1442 btrfs_end_write_no_snapshoting(root
);
1447 extent_clear_unlock_delalloc(inode
, cur_offset
,
1448 cur_offset
+ num_bytes
- 1,
1449 locked_page
, EXTENT_LOCKED
|
1450 EXTENT_DELALLOC
, PAGE_UNLOCK
|
1452 if (!nolock
&& nocow
)
1453 btrfs_end_write_no_snapshoting(root
);
1454 cur_offset
= extent_end
;
1455 if (cur_offset
> end
)
1458 btrfs_release_path(path
);
1460 if (cur_offset
<= end
&& cow_start
== (u64
)-1) {
1461 cow_start
= cur_offset
;
1465 if (cow_start
!= (u64
)-1) {
1466 ret
= cow_file_range(inode
, locked_page
, cow_start
, end
,
1467 page_started
, nr_written
, 1);
1473 err
= btrfs_end_transaction(trans
, root
);
1477 if (ret
&& cur_offset
< end
)
1478 extent_clear_unlock_delalloc(inode
, cur_offset
, end
,
1479 locked_page
, EXTENT_LOCKED
|
1480 EXTENT_DELALLOC
| EXTENT_DEFRAG
|
1481 EXTENT_DO_ACCOUNTING
, PAGE_UNLOCK
|
1483 PAGE_SET_WRITEBACK
|
1484 PAGE_END_WRITEBACK
);
1485 btrfs_free_path(path
);
1489 static inline int need_force_cow(struct inode
*inode
, u64 start
, u64 end
)
1492 if (!(BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
) &&
1493 !(BTRFS_I(inode
)->flags
& BTRFS_INODE_PREALLOC
))
1497 * @defrag_bytes is a hint value, no spinlock held here,
1498 * if is not zero, it means the file is defragging.
1499 * Force cow if given extent needs to be defragged.
1501 if (BTRFS_I(inode
)->defrag_bytes
&&
1502 test_range_bit(&BTRFS_I(inode
)->io_tree
, start
, end
,
1503 EXTENT_DEFRAG
, 0, NULL
))
1510 * extent_io.c call back to do delayed allocation processing
1512 static int run_delalloc_range(struct inode
*inode
, struct page
*locked_page
,
1513 u64 start
, u64 end
, int *page_started
,
1514 unsigned long *nr_written
)
1517 int force_cow
= need_force_cow(inode
, start
, end
);
1519 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
&& !force_cow
) {
1520 ret
= run_delalloc_nocow(inode
, locked_page
, start
, end
,
1521 page_started
, 1, nr_written
);
1522 } else if (BTRFS_I(inode
)->flags
& BTRFS_INODE_PREALLOC
&& !force_cow
) {
1523 ret
= run_delalloc_nocow(inode
, locked_page
, start
, end
,
1524 page_started
, 0, nr_written
);
1525 } else if (!inode_need_compress(inode
)) {
1526 ret
= cow_file_range(inode
, locked_page
, start
, end
,
1527 page_started
, nr_written
, 1);
1529 set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
1530 &BTRFS_I(inode
)->runtime_flags
);
1531 ret
= cow_file_range_async(inode
, locked_page
, start
, end
,
1532 page_started
, nr_written
);
1537 static void btrfs_split_extent_hook(struct inode
*inode
,
1538 struct extent_state
*orig
, u64 split
)
1542 /* not delalloc, ignore it */
1543 if (!(orig
->state
& EXTENT_DELALLOC
))
1546 size
= orig
->end
- orig
->start
+ 1;
1547 if (size
> BTRFS_MAX_EXTENT_SIZE
) {
1552 * See the explanation in btrfs_merge_extent_hook, the same
1553 * applies here, just in reverse.
1555 new_size
= orig
->end
- split
+ 1;
1556 num_extents
= div64_u64(new_size
+ BTRFS_MAX_EXTENT_SIZE
- 1,
1557 BTRFS_MAX_EXTENT_SIZE
);
1558 new_size
= split
- orig
->start
;
1559 num_extents
+= div64_u64(new_size
+ BTRFS_MAX_EXTENT_SIZE
- 1,
1560 BTRFS_MAX_EXTENT_SIZE
);
1561 if (div64_u64(size
+ BTRFS_MAX_EXTENT_SIZE
- 1,
1562 BTRFS_MAX_EXTENT_SIZE
) >= num_extents
)
1566 spin_lock(&BTRFS_I(inode
)->lock
);
1567 BTRFS_I(inode
)->outstanding_extents
++;
1568 spin_unlock(&BTRFS_I(inode
)->lock
);
1572 * extent_io.c merge_extent_hook, used to track merged delayed allocation
1573 * extents so we can keep track of new extents that are just merged onto old
1574 * extents, such as when we are doing sequential writes, so we can properly
1575 * account for the metadata space we'll need.
1577 static void btrfs_merge_extent_hook(struct inode
*inode
,
1578 struct extent_state
*new,
1579 struct extent_state
*other
)
1581 u64 new_size
, old_size
;
1584 /* not delalloc, ignore it */
1585 if (!(other
->state
& EXTENT_DELALLOC
))
1588 if (new->start
> other
->start
)
1589 new_size
= new->end
- other
->start
+ 1;
1591 new_size
= other
->end
- new->start
+ 1;
1593 /* we're not bigger than the max, unreserve the space and go */
1594 if (new_size
<= BTRFS_MAX_EXTENT_SIZE
) {
1595 spin_lock(&BTRFS_I(inode
)->lock
);
1596 BTRFS_I(inode
)->outstanding_extents
--;
1597 spin_unlock(&BTRFS_I(inode
)->lock
);
1602 * We have to add up either side to figure out how many extents were
1603 * accounted for before we merged into one big extent. If the number of
1604 * extents we accounted for is <= the amount we need for the new range
1605 * then we can return, otherwise drop. Think of it like this
1609 * So we've grown the extent by a MAX_SIZE extent, this would mean we
1610 * need 2 outstanding extents, on one side we have 1 and the other side
1611 * we have 1 so they are == and we can return. But in this case
1613 * [MAX_SIZE+4k][MAX_SIZE+4k]
1615 * Each range on their own accounts for 2 extents, but merged together
1616 * they are only 3 extents worth of accounting, so we need to drop in
1619 old_size
= other
->end
- other
->start
+ 1;
1620 num_extents
= div64_u64(old_size
+ BTRFS_MAX_EXTENT_SIZE
- 1,
1621 BTRFS_MAX_EXTENT_SIZE
);
1622 old_size
= new->end
- new->start
+ 1;
1623 num_extents
+= div64_u64(old_size
+ BTRFS_MAX_EXTENT_SIZE
- 1,
1624 BTRFS_MAX_EXTENT_SIZE
);
1626 if (div64_u64(new_size
+ BTRFS_MAX_EXTENT_SIZE
- 1,
1627 BTRFS_MAX_EXTENT_SIZE
) >= num_extents
)
1630 spin_lock(&BTRFS_I(inode
)->lock
);
1631 BTRFS_I(inode
)->outstanding_extents
--;
1632 spin_unlock(&BTRFS_I(inode
)->lock
);
1635 static void btrfs_add_delalloc_inodes(struct btrfs_root
*root
,
1636 struct inode
*inode
)
1638 spin_lock(&root
->delalloc_lock
);
1639 if (list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
1640 list_add_tail(&BTRFS_I(inode
)->delalloc_inodes
,
1641 &root
->delalloc_inodes
);
1642 set_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1643 &BTRFS_I(inode
)->runtime_flags
);
1644 root
->nr_delalloc_inodes
++;
1645 if (root
->nr_delalloc_inodes
== 1) {
1646 spin_lock(&root
->fs_info
->delalloc_root_lock
);
1647 BUG_ON(!list_empty(&root
->delalloc_root
));
1648 list_add_tail(&root
->delalloc_root
,
1649 &root
->fs_info
->delalloc_roots
);
1650 spin_unlock(&root
->fs_info
->delalloc_root_lock
);
1653 spin_unlock(&root
->delalloc_lock
);
1656 static void btrfs_del_delalloc_inode(struct btrfs_root
*root
,
1657 struct inode
*inode
)
1659 spin_lock(&root
->delalloc_lock
);
1660 if (!list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
1661 list_del_init(&BTRFS_I(inode
)->delalloc_inodes
);
1662 clear_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1663 &BTRFS_I(inode
)->runtime_flags
);
1664 root
->nr_delalloc_inodes
--;
1665 if (!root
->nr_delalloc_inodes
) {
1666 spin_lock(&root
->fs_info
->delalloc_root_lock
);
1667 BUG_ON(list_empty(&root
->delalloc_root
));
1668 list_del_init(&root
->delalloc_root
);
1669 spin_unlock(&root
->fs_info
->delalloc_root_lock
);
1672 spin_unlock(&root
->delalloc_lock
);
1676 * extent_io.c set_bit_hook, used to track delayed allocation
1677 * bytes in this file, and to maintain the list of inodes that
1678 * have pending delalloc work to be done.
1680 static void btrfs_set_bit_hook(struct inode
*inode
,
1681 struct extent_state
*state
, unsigned *bits
)
1684 if ((*bits
& EXTENT_DEFRAG
) && !(*bits
& EXTENT_DELALLOC
))
1687 * set_bit and clear bit hooks normally require _irqsave/restore
1688 * but in this case, we are only testing for the DELALLOC
1689 * bit, which is only set or cleared with irqs on
1691 if (!(state
->state
& EXTENT_DELALLOC
) && (*bits
& EXTENT_DELALLOC
)) {
1692 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1693 u64 len
= state
->end
+ 1 - state
->start
;
1694 bool do_list
= !btrfs_is_free_space_inode(inode
);
1696 if (*bits
& EXTENT_FIRST_DELALLOC
) {
1697 *bits
&= ~EXTENT_FIRST_DELALLOC
;
1699 spin_lock(&BTRFS_I(inode
)->lock
);
1700 BTRFS_I(inode
)->outstanding_extents
++;
1701 spin_unlock(&BTRFS_I(inode
)->lock
);
1704 /* For sanity tests */
1705 if (btrfs_test_is_dummy_root(root
))
1708 __percpu_counter_add(&root
->fs_info
->delalloc_bytes
, len
,
1709 root
->fs_info
->delalloc_batch
);
1710 spin_lock(&BTRFS_I(inode
)->lock
);
1711 BTRFS_I(inode
)->delalloc_bytes
+= len
;
1712 if (*bits
& EXTENT_DEFRAG
)
1713 BTRFS_I(inode
)->defrag_bytes
+= len
;
1714 if (do_list
&& !test_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1715 &BTRFS_I(inode
)->runtime_flags
))
1716 btrfs_add_delalloc_inodes(root
, inode
);
1717 spin_unlock(&BTRFS_I(inode
)->lock
);
1722 * extent_io.c clear_bit_hook, see set_bit_hook for why
1724 static void btrfs_clear_bit_hook(struct inode
*inode
,
1725 struct extent_state
*state
,
1728 u64 len
= state
->end
+ 1 - state
->start
;
1729 u64 num_extents
= div64_u64(len
+ BTRFS_MAX_EXTENT_SIZE
-1,
1730 BTRFS_MAX_EXTENT_SIZE
);
1732 spin_lock(&BTRFS_I(inode
)->lock
);
1733 if ((state
->state
& EXTENT_DEFRAG
) && (*bits
& EXTENT_DEFRAG
))
1734 BTRFS_I(inode
)->defrag_bytes
-= len
;
1735 spin_unlock(&BTRFS_I(inode
)->lock
);
1738 * set_bit and clear bit hooks normally require _irqsave/restore
1739 * but in this case, we are only testing for the DELALLOC
1740 * bit, which is only set or cleared with irqs on
1742 if ((state
->state
& EXTENT_DELALLOC
) && (*bits
& EXTENT_DELALLOC
)) {
1743 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1744 bool do_list
= !btrfs_is_free_space_inode(inode
);
1746 if (*bits
& EXTENT_FIRST_DELALLOC
) {
1747 *bits
&= ~EXTENT_FIRST_DELALLOC
;
1748 } else if (!(*bits
& EXTENT_DO_ACCOUNTING
)) {
1749 spin_lock(&BTRFS_I(inode
)->lock
);
1750 BTRFS_I(inode
)->outstanding_extents
-= num_extents
;
1751 spin_unlock(&BTRFS_I(inode
)->lock
);
1755 * We don't reserve metadata space for space cache inodes so we
1756 * don't need to call dellalloc_release_metadata if there is an
1759 if (*bits
& EXTENT_DO_ACCOUNTING
&&
1760 root
!= root
->fs_info
->tree_root
)
1761 btrfs_delalloc_release_metadata(inode
, len
);
1763 /* For sanity tests. */
1764 if (btrfs_test_is_dummy_root(root
))
1767 if (root
->root_key
.objectid
!= BTRFS_DATA_RELOC_TREE_OBJECTID
1768 && do_list
&& !(state
->state
& EXTENT_NORESERVE
))
1769 btrfs_free_reserved_data_space(inode
, len
);
1771 __percpu_counter_add(&root
->fs_info
->delalloc_bytes
, -len
,
1772 root
->fs_info
->delalloc_batch
);
1773 spin_lock(&BTRFS_I(inode
)->lock
);
1774 BTRFS_I(inode
)->delalloc_bytes
-= len
;
1775 if (do_list
&& BTRFS_I(inode
)->delalloc_bytes
== 0 &&
1776 test_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1777 &BTRFS_I(inode
)->runtime_flags
))
1778 btrfs_del_delalloc_inode(root
, inode
);
1779 spin_unlock(&BTRFS_I(inode
)->lock
);
1784 * extent_io.c merge_bio_hook, this must check the chunk tree to make sure
1785 * we don't create bios that span stripes or chunks
1787 int btrfs_merge_bio_hook(int rw
, struct page
*page
, unsigned long offset
,
1788 size_t size
, struct bio
*bio
,
1789 unsigned long bio_flags
)
1791 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
1792 u64 logical
= (u64
)bio
->bi_iter
.bi_sector
<< 9;
1797 if (bio_flags
& EXTENT_BIO_COMPRESSED
)
1800 length
= bio
->bi_iter
.bi_size
;
1801 map_length
= length
;
1802 ret
= btrfs_map_block(root
->fs_info
, rw
, logical
,
1803 &map_length
, NULL
, 0);
1804 /* Will always return 0 with map_multi == NULL */
1806 if (map_length
< length
+ size
)
1812 * in order to insert checksums into the metadata in large chunks,
1813 * we wait until bio submission time. All the pages in the bio are
1814 * checksummed and sums are attached onto the ordered extent record.
1816 * At IO completion time the cums attached on the ordered extent record
1817 * are inserted into the btree
1819 static int __btrfs_submit_bio_start(struct inode
*inode
, int rw
,
1820 struct bio
*bio
, int mirror_num
,
1821 unsigned long bio_flags
,
1824 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1827 ret
= btrfs_csum_one_bio(root
, inode
, bio
, 0, 0);
1828 BUG_ON(ret
); /* -ENOMEM */
1833 * in order to insert checksums into the metadata in large chunks,
1834 * we wait until bio submission time. All the pages in the bio are
1835 * checksummed and sums are attached onto the ordered extent record.
1837 * At IO completion time the cums attached on the ordered extent record
1838 * are inserted into the btree
1840 static int __btrfs_submit_bio_done(struct inode
*inode
, int rw
, struct bio
*bio
,
1841 int mirror_num
, unsigned long bio_flags
,
1844 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1847 ret
= btrfs_map_bio(root
, rw
, bio
, mirror_num
, 1);
1849 bio
->bi_error
= ret
;
1856 * extent_io.c submission hook. This does the right thing for csum calculation
1857 * on write, or reading the csums from the tree before a read
1859 static int btrfs_submit_bio_hook(struct inode
*inode
, int rw
, struct bio
*bio
,
1860 int mirror_num
, unsigned long bio_flags
,
1863 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1867 int async
= !atomic_read(&BTRFS_I(inode
)->sync_writers
);
1869 skip_sum
= BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
;
1871 if (btrfs_is_free_space_inode(inode
))
1874 if (!(rw
& REQ_WRITE
)) {
1875 ret
= btrfs_bio_wq_end_io(root
->fs_info
, bio
, metadata
);
1879 if (bio_flags
& EXTENT_BIO_COMPRESSED
) {
1880 ret
= btrfs_submit_compressed_read(inode
, bio
,
1884 } else if (!skip_sum
) {
1885 ret
= btrfs_lookup_bio_sums(root
, inode
, bio
, NULL
);
1890 } else if (async
&& !skip_sum
) {
1891 /* csum items have already been cloned */
1892 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
)
1894 /* we're doing a write, do the async checksumming */
1895 ret
= btrfs_wq_submit_bio(BTRFS_I(inode
)->root
->fs_info
,
1896 inode
, rw
, bio
, mirror_num
,
1897 bio_flags
, bio_offset
,
1898 __btrfs_submit_bio_start
,
1899 __btrfs_submit_bio_done
);
1901 } else if (!skip_sum
) {
1902 ret
= btrfs_csum_one_bio(root
, inode
, bio
, 0, 0);
1908 ret
= btrfs_map_bio(root
, rw
, bio
, mirror_num
, 0);
1912 bio
->bi_error
= ret
;
1919 * given a list of ordered sums record them in the inode. This happens
1920 * at IO completion time based on sums calculated at bio submission time.
1922 static noinline
int add_pending_csums(struct btrfs_trans_handle
*trans
,
1923 struct inode
*inode
, u64 file_offset
,
1924 struct list_head
*list
)
1926 struct btrfs_ordered_sum
*sum
;
1928 list_for_each_entry(sum
, list
, list
) {
1929 trans
->adding_csums
= 1;
1930 btrfs_csum_file_blocks(trans
,
1931 BTRFS_I(inode
)->root
->fs_info
->csum_root
, sum
);
1932 trans
->adding_csums
= 0;
1937 int btrfs_set_extent_delalloc(struct inode
*inode
, u64 start
, u64 end
,
1938 struct extent_state
**cached_state
)
1940 WARN_ON((end
& (PAGE_CACHE_SIZE
- 1)) == 0);
1941 return set_extent_delalloc(&BTRFS_I(inode
)->io_tree
, start
, end
,
1942 cached_state
, GFP_NOFS
);
1945 /* see btrfs_writepage_start_hook for details on why this is required */
1946 struct btrfs_writepage_fixup
{
1948 struct btrfs_work work
;
1951 static void btrfs_writepage_fixup_worker(struct btrfs_work
*work
)
1953 struct btrfs_writepage_fixup
*fixup
;
1954 struct btrfs_ordered_extent
*ordered
;
1955 struct extent_state
*cached_state
= NULL
;
1957 struct inode
*inode
;
1962 fixup
= container_of(work
, struct btrfs_writepage_fixup
, work
);
1966 if (!page
->mapping
|| !PageDirty(page
) || !PageChecked(page
)) {
1967 ClearPageChecked(page
);
1971 inode
= page
->mapping
->host
;
1972 page_start
= page_offset(page
);
1973 page_end
= page_offset(page
) + PAGE_CACHE_SIZE
- 1;
1975 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
, 0,
1978 /* already ordered? We're done */
1979 if (PagePrivate2(page
))
1982 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
1984 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, page_start
,
1985 page_end
, &cached_state
, GFP_NOFS
);
1987 btrfs_start_ordered_extent(inode
, ordered
, 1);
1988 btrfs_put_ordered_extent(ordered
);
1992 ret
= btrfs_delalloc_reserve_space(inode
, PAGE_CACHE_SIZE
);
1994 mapping_set_error(page
->mapping
, ret
);
1995 end_extent_writepage(page
, ret
, page_start
, page_end
);
1996 ClearPageChecked(page
);
2000 btrfs_set_extent_delalloc(inode
, page_start
, page_end
, &cached_state
);
2001 ClearPageChecked(page
);
2002 set_page_dirty(page
);
2004 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
,
2005 &cached_state
, GFP_NOFS
);
2008 page_cache_release(page
);
2013 * There are a few paths in the higher layers of the kernel that directly
2014 * set the page dirty bit without asking the filesystem if it is a
2015 * good idea. This causes problems because we want to make sure COW
2016 * properly happens and the data=ordered rules are followed.
2018 * In our case any range that doesn't have the ORDERED bit set
2019 * hasn't been properly setup for IO. We kick off an async process
2020 * to fix it up. The async helper will wait for ordered extents, set
2021 * the delalloc bit and make it safe to write the page.
2023 static int btrfs_writepage_start_hook(struct page
*page
, u64 start
, u64 end
)
2025 struct inode
*inode
= page
->mapping
->host
;
2026 struct btrfs_writepage_fixup
*fixup
;
2027 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2029 /* this page is properly in the ordered list */
2030 if (TestClearPagePrivate2(page
))
2033 if (PageChecked(page
))
2036 fixup
= kzalloc(sizeof(*fixup
), GFP_NOFS
);
2040 SetPageChecked(page
);
2041 page_cache_get(page
);
2042 btrfs_init_work(&fixup
->work
, btrfs_fixup_helper
,
2043 btrfs_writepage_fixup_worker
, NULL
, NULL
);
2045 btrfs_queue_work(root
->fs_info
->fixup_workers
, &fixup
->work
);
2049 static int insert_reserved_file_extent(struct btrfs_trans_handle
*trans
,
2050 struct inode
*inode
, u64 file_pos
,
2051 u64 disk_bytenr
, u64 disk_num_bytes
,
2052 u64 num_bytes
, u64 ram_bytes
,
2053 u8 compression
, u8 encryption
,
2054 u16 other_encoding
, int extent_type
)
2056 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2057 struct btrfs_file_extent_item
*fi
;
2058 struct btrfs_path
*path
;
2059 struct extent_buffer
*leaf
;
2060 struct btrfs_key ins
;
2061 int extent_inserted
= 0;
2064 path
= btrfs_alloc_path();
2069 * we may be replacing one extent in the tree with another.
2070 * The new extent is pinned in the extent map, and we don't want
2071 * to drop it from the cache until it is completely in the btree.
2073 * So, tell btrfs_drop_extents to leave this extent in the cache.
2074 * the caller is expected to unpin it and allow it to be merged
2077 ret
= __btrfs_drop_extents(trans
, root
, inode
, path
, file_pos
,
2078 file_pos
+ num_bytes
, NULL
, 0,
2079 1, sizeof(*fi
), &extent_inserted
);
2083 if (!extent_inserted
) {
2084 ins
.objectid
= btrfs_ino(inode
);
2085 ins
.offset
= file_pos
;
2086 ins
.type
= BTRFS_EXTENT_DATA_KEY
;
2088 path
->leave_spinning
= 1;
2089 ret
= btrfs_insert_empty_item(trans
, root
, path
, &ins
,
2094 leaf
= path
->nodes
[0];
2095 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
2096 struct btrfs_file_extent_item
);
2097 btrfs_set_file_extent_generation(leaf
, fi
, trans
->transid
);
2098 btrfs_set_file_extent_type(leaf
, fi
, extent_type
);
2099 btrfs_set_file_extent_disk_bytenr(leaf
, fi
, disk_bytenr
);
2100 btrfs_set_file_extent_disk_num_bytes(leaf
, fi
, disk_num_bytes
);
2101 btrfs_set_file_extent_offset(leaf
, fi
, 0);
2102 btrfs_set_file_extent_num_bytes(leaf
, fi
, num_bytes
);
2103 btrfs_set_file_extent_ram_bytes(leaf
, fi
, ram_bytes
);
2104 btrfs_set_file_extent_compression(leaf
, fi
, compression
);
2105 btrfs_set_file_extent_encryption(leaf
, fi
, encryption
);
2106 btrfs_set_file_extent_other_encoding(leaf
, fi
, other_encoding
);
2108 btrfs_mark_buffer_dirty(leaf
);
2109 btrfs_release_path(path
);
2111 inode_add_bytes(inode
, num_bytes
);
2113 ins
.objectid
= disk_bytenr
;
2114 ins
.offset
= disk_num_bytes
;
2115 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
2116 ret
= btrfs_alloc_reserved_file_extent(trans
, root
,
2117 root
->root_key
.objectid
,
2118 btrfs_ino(inode
), file_pos
, &ins
);
2120 btrfs_free_path(path
);
2125 /* snapshot-aware defrag */
2126 struct sa_defrag_extent_backref
{
2127 struct rb_node node
;
2128 struct old_sa_defrag_extent
*old
;
2137 struct old_sa_defrag_extent
{
2138 struct list_head list
;
2139 struct new_sa_defrag_extent
*new;
2148 struct new_sa_defrag_extent
{
2149 struct rb_root root
;
2150 struct list_head head
;
2151 struct btrfs_path
*path
;
2152 struct inode
*inode
;
2160 static int backref_comp(struct sa_defrag_extent_backref
*b1
,
2161 struct sa_defrag_extent_backref
*b2
)
2163 if (b1
->root_id
< b2
->root_id
)
2165 else if (b1
->root_id
> b2
->root_id
)
2168 if (b1
->inum
< b2
->inum
)
2170 else if (b1
->inum
> b2
->inum
)
2173 if (b1
->file_pos
< b2
->file_pos
)
2175 else if (b1
->file_pos
> b2
->file_pos
)
2179 * [------------------------------] ===> (a range of space)
2180 * |<--->| |<---->| =============> (fs/file tree A)
2181 * |<---------------------------->| ===> (fs/file tree B)
2183 * A range of space can refer to two file extents in one tree while
2184 * refer to only one file extent in another tree.
2186 * So we may process a disk offset more than one time(two extents in A)
2187 * and locate at the same extent(one extent in B), then insert two same
2188 * backrefs(both refer to the extent in B).
2193 static void backref_insert(struct rb_root
*root
,
2194 struct sa_defrag_extent_backref
*backref
)
2196 struct rb_node
**p
= &root
->rb_node
;
2197 struct rb_node
*parent
= NULL
;
2198 struct sa_defrag_extent_backref
*entry
;
2203 entry
= rb_entry(parent
, struct sa_defrag_extent_backref
, node
);
2205 ret
= backref_comp(backref
, entry
);
2209 p
= &(*p
)->rb_right
;
2212 rb_link_node(&backref
->node
, parent
, p
);
2213 rb_insert_color(&backref
->node
, root
);
2217 * Note the backref might has changed, and in this case we just return 0.
2219 static noinline
int record_one_backref(u64 inum
, u64 offset
, u64 root_id
,
2222 struct btrfs_file_extent_item
*extent
;
2223 struct btrfs_fs_info
*fs_info
;
2224 struct old_sa_defrag_extent
*old
= ctx
;
2225 struct new_sa_defrag_extent
*new = old
->new;
2226 struct btrfs_path
*path
= new->path
;
2227 struct btrfs_key key
;
2228 struct btrfs_root
*root
;
2229 struct sa_defrag_extent_backref
*backref
;
2230 struct extent_buffer
*leaf
;
2231 struct inode
*inode
= new->inode
;
2237 if (BTRFS_I(inode
)->root
->root_key
.objectid
== root_id
&&
2238 inum
== btrfs_ino(inode
))
2241 key
.objectid
= root_id
;
2242 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2243 key
.offset
= (u64
)-1;
2245 fs_info
= BTRFS_I(inode
)->root
->fs_info
;
2246 root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
2248 if (PTR_ERR(root
) == -ENOENT
)
2251 pr_debug("inum=%llu, offset=%llu, root_id=%llu\n",
2252 inum
, offset
, root_id
);
2253 return PTR_ERR(root
);
2256 key
.objectid
= inum
;
2257 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2258 if (offset
> (u64
)-1 << 32)
2261 key
.offset
= offset
;
2263 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2264 if (WARN_ON(ret
< 0))
2271 leaf
= path
->nodes
[0];
2272 slot
= path
->slots
[0];
2274 if (slot
>= btrfs_header_nritems(leaf
)) {
2275 ret
= btrfs_next_leaf(root
, path
);
2278 } else if (ret
> 0) {
2287 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2289 if (key
.objectid
> inum
)
2292 if (key
.objectid
< inum
|| key
.type
!= BTRFS_EXTENT_DATA_KEY
)
2295 extent
= btrfs_item_ptr(leaf
, slot
,
2296 struct btrfs_file_extent_item
);
2298 if (btrfs_file_extent_disk_bytenr(leaf
, extent
) != old
->bytenr
)
2302 * 'offset' refers to the exact key.offset,
2303 * NOT the 'offset' field in btrfs_extent_data_ref, ie.
2304 * (key.offset - extent_offset).
2306 if (key
.offset
!= offset
)
2309 extent_offset
= btrfs_file_extent_offset(leaf
, extent
);
2310 num_bytes
= btrfs_file_extent_num_bytes(leaf
, extent
);
2312 if (extent_offset
>= old
->extent_offset
+ old
->offset
+
2313 old
->len
|| extent_offset
+ num_bytes
<=
2314 old
->extent_offset
+ old
->offset
)
2319 backref
= kmalloc(sizeof(*backref
), GFP_NOFS
);
2325 backref
->root_id
= root_id
;
2326 backref
->inum
= inum
;
2327 backref
->file_pos
= offset
;
2328 backref
->num_bytes
= num_bytes
;
2329 backref
->extent_offset
= extent_offset
;
2330 backref
->generation
= btrfs_file_extent_generation(leaf
, extent
);
2332 backref_insert(&new->root
, backref
);
2335 btrfs_release_path(path
);
2340 static noinline
bool record_extent_backrefs(struct btrfs_path
*path
,
2341 struct new_sa_defrag_extent
*new)
2343 struct btrfs_fs_info
*fs_info
= BTRFS_I(new->inode
)->root
->fs_info
;
2344 struct old_sa_defrag_extent
*old
, *tmp
;
2349 list_for_each_entry_safe(old
, tmp
, &new->head
, list
) {
2350 ret
= iterate_inodes_from_logical(old
->bytenr
+
2351 old
->extent_offset
, fs_info
,
2352 path
, record_one_backref
,
2354 if (ret
< 0 && ret
!= -ENOENT
)
2357 /* no backref to be processed for this extent */
2359 list_del(&old
->list
);
2364 if (list_empty(&new->head
))
2370 static int relink_is_mergable(struct extent_buffer
*leaf
,
2371 struct btrfs_file_extent_item
*fi
,
2372 struct new_sa_defrag_extent
*new)
2374 if (btrfs_file_extent_disk_bytenr(leaf
, fi
) != new->bytenr
)
2377 if (btrfs_file_extent_type(leaf
, fi
) != BTRFS_FILE_EXTENT_REG
)
2380 if (btrfs_file_extent_compression(leaf
, fi
) != new->compress_type
)
2383 if (btrfs_file_extent_encryption(leaf
, fi
) ||
2384 btrfs_file_extent_other_encoding(leaf
, fi
))
2391 * Note the backref might has changed, and in this case we just return 0.
2393 static noinline
int relink_extent_backref(struct btrfs_path
*path
,
2394 struct sa_defrag_extent_backref
*prev
,
2395 struct sa_defrag_extent_backref
*backref
)
2397 struct btrfs_file_extent_item
*extent
;
2398 struct btrfs_file_extent_item
*item
;
2399 struct btrfs_ordered_extent
*ordered
;
2400 struct btrfs_trans_handle
*trans
;
2401 struct btrfs_fs_info
*fs_info
;
2402 struct btrfs_root
*root
;
2403 struct btrfs_key key
;
2404 struct extent_buffer
*leaf
;
2405 struct old_sa_defrag_extent
*old
= backref
->old
;
2406 struct new_sa_defrag_extent
*new = old
->new;
2407 struct inode
*src_inode
= new->inode
;
2408 struct inode
*inode
;
2409 struct extent_state
*cached
= NULL
;
2418 if (prev
&& prev
->root_id
== backref
->root_id
&&
2419 prev
->inum
== backref
->inum
&&
2420 prev
->file_pos
+ prev
->num_bytes
== backref
->file_pos
)
2423 /* step 1: get root */
2424 key
.objectid
= backref
->root_id
;
2425 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2426 key
.offset
= (u64
)-1;
2428 fs_info
= BTRFS_I(src_inode
)->root
->fs_info
;
2429 index
= srcu_read_lock(&fs_info
->subvol_srcu
);
2431 root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
2433 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
2434 if (PTR_ERR(root
) == -ENOENT
)
2436 return PTR_ERR(root
);
2439 if (btrfs_root_readonly(root
)) {
2440 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
2444 /* step 2: get inode */
2445 key
.objectid
= backref
->inum
;
2446 key
.type
= BTRFS_INODE_ITEM_KEY
;
2449 inode
= btrfs_iget(fs_info
->sb
, &key
, root
, NULL
);
2450 if (IS_ERR(inode
)) {
2451 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
2455 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
2457 /* step 3: relink backref */
2458 lock_start
= backref
->file_pos
;
2459 lock_end
= backref
->file_pos
+ backref
->num_bytes
- 1;
2460 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, lock_start
, lock_end
,
2463 ordered
= btrfs_lookup_first_ordered_extent(inode
, lock_end
);
2465 btrfs_put_ordered_extent(ordered
);
2469 trans
= btrfs_join_transaction(root
);
2470 if (IS_ERR(trans
)) {
2471 ret
= PTR_ERR(trans
);
2475 key
.objectid
= backref
->inum
;
2476 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2477 key
.offset
= backref
->file_pos
;
2479 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2482 } else if (ret
> 0) {
2487 extent
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
2488 struct btrfs_file_extent_item
);
2490 if (btrfs_file_extent_generation(path
->nodes
[0], extent
) !=
2491 backref
->generation
)
2494 btrfs_release_path(path
);
2496 start
= backref
->file_pos
;
2497 if (backref
->extent_offset
< old
->extent_offset
+ old
->offset
)
2498 start
+= old
->extent_offset
+ old
->offset
-
2499 backref
->extent_offset
;
2501 len
= min(backref
->extent_offset
+ backref
->num_bytes
,
2502 old
->extent_offset
+ old
->offset
+ old
->len
);
2503 len
-= max(backref
->extent_offset
, old
->extent_offset
+ old
->offset
);
2505 ret
= btrfs_drop_extents(trans
, root
, inode
, start
,
2510 key
.objectid
= btrfs_ino(inode
);
2511 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2514 path
->leave_spinning
= 1;
2516 struct btrfs_file_extent_item
*fi
;
2518 struct btrfs_key found_key
;
2520 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
2525 leaf
= path
->nodes
[0];
2526 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
2528 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
2529 struct btrfs_file_extent_item
);
2530 extent_len
= btrfs_file_extent_num_bytes(leaf
, fi
);
2532 if (extent_len
+ found_key
.offset
== start
&&
2533 relink_is_mergable(leaf
, fi
, new)) {
2534 btrfs_set_file_extent_num_bytes(leaf
, fi
,
2536 btrfs_mark_buffer_dirty(leaf
);
2537 inode_add_bytes(inode
, len
);
2543 btrfs_release_path(path
);
2548 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2551 btrfs_abort_transaction(trans
, root
, ret
);
2555 leaf
= path
->nodes
[0];
2556 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2557 struct btrfs_file_extent_item
);
2558 btrfs_set_file_extent_disk_bytenr(leaf
, item
, new->bytenr
);
2559 btrfs_set_file_extent_disk_num_bytes(leaf
, item
, new->disk_len
);
2560 btrfs_set_file_extent_offset(leaf
, item
, start
- new->file_pos
);
2561 btrfs_set_file_extent_num_bytes(leaf
, item
, len
);
2562 btrfs_set_file_extent_ram_bytes(leaf
, item
, new->len
);
2563 btrfs_set_file_extent_generation(leaf
, item
, trans
->transid
);
2564 btrfs_set_file_extent_type(leaf
, item
, BTRFS_FILE_EXTENT_REG
);
2565 btrfs_set_file_extent_compression(leaf
, item
, new->compress_type
);
2566 btrfs_set_file_extent_encryption(leaf
, item
, 0);
2567 btrfs_set_file_extent_other_encoding(leaf
, item
, 0);
2569 btrfs_mark_buffer_dirty(leaf
);
2570 inode_add_bytes(inode
, len
);
2571 btrfs_release_path(path
);
2573 ret
= btrfs_inc_extent_ref(trans
, root
, new->bytenr
,
2575 backref
->root_id
, backref
->inum
,
2576 new->file_pos
, 0); /* start - extent_offset */
2578 btrfs_abort_transaction(trans
, root
, ret
);
2584 btrfs_release_path(path
);
2585 path
->leave_spinning
= 0;
2586 btrfs_end_transaction(trans
, root
);
2588 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, lock_start
, lock_end
,
2594 static void free_sa_defrag_extent(struct new_sa_defrag_extent
*new)
2596 struct old_sa_defrag_extent
*old
, *tmp
;
2601 list_for_each_entry_safe(old
, tmp
, &new->head
, list
) {
2602 list_del(&old
->list
);
2608 static void relink_file_extents(struct new_sa_defrag_extent
*new)
2610 struct btrfs_path
*path
;
2611 struct sa_defrag_extent_backref
*backref
;
2612 struct sa_defrag_extent_backref
*prev
= NULL
;
2613 struct inode
*inode
;
2614 struct btrfs_root
*root
;
2615 struct rb_node
*node
;
2619 root
= BTRFS_I(inode
)->root
;
2621 path
= btrfs_alloc_path();
2625 if (!record_extent_backrefs(path
, new)) {
2626 btrfs_free_path(path
);
2629 btrfs_release_path(path
);
2632 node
= rb_first(&new->root
);
2635 rb_erase(node
, &new->root
);
2637 backref
= rb_entry(node
, struct sa_defrag_extent_backref
, node
);
2639 ret
= relink_extent_backref(path
, prev
, backref
);
2652 btrfs_free_path(path
);
2654 free_sa_defrag_extent(new);
2656 atomic_dec(&root
->fs_info
->defrag_running
);
2657 wake_up(&root
->fs_info
->transaction_wait
);
2660 static struct new_sa_defrag_extent
*
2661 record_old_file_extents(struct inode
*inode
,
2662 struct btrfs_ordered_extent
*ordered
)
2664 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2665 struct btrfs_path
*path
;
2666 struct btrfs_key key
;
2667 struct old_sa_defrag_extent
*old
;
2668 struct new_sa_defrag_extent
*new;
2671 new = kmalloc(sizeof(*new), GFP_NOFS
);
2676 new->file_pos
= ordered
->file_offset
;
2677 new->len
= ordered
->len
;
2678 new->bytenr
= ordered
->start
;
2679 new->disk_len
= ordered
->disk_len
;
2680 new->compress_type
= ordered
->compress_type
;
2681 new->root
= RB_ROOT
;
2682 INIT_LIST_HEAD(&new->head
);
2684 path
= btrfs_alloc_path();
2688 key
.objectid
= btrfs_ino(inode
);
2689 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2690 key
.offset
= new->file_pos
;
2692 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2695 if (ret
> 0 && path
->slots
[0] > 0)
2698 /* find out all the old extents for the file range */
2700 struct btrfs_file_extent_item
*extent
;
2701 struct extent_buffer
*l
;
2710 slot
= path
->slots
[0];
2712 if (slot
>= btrfs_header_nritems(l
)) {
2713 ret
= btrfs_next_leaf(root
, path
);
2721 btrfs_item_key_to_cpu(l
, &key
, slot
);
2723 if (key
.objectid
!= btrfs_ino(inode
))
2725 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
2727 if (key
.offset
>= new->file_pos
+ new->len
)
2730 extent
= btrfs_item_ptr(l
, slot
, struct btrfs_file_extent_item
);
2732 num_bytes
= btrfs_file_extent_num_bytes(l
, extent
);
2733 if (key
.offset
+ num_bytes
< new->file_pos
)
2736 disk_bytenr
= btrfs_file_extent_disk_bytenr(l
, extent
);
2740 extent_offset
= btrfs_file_extent_offset(l
, extent
);
2742 old
= kmalloc(sizeof(*old
), GFP_NOFS
);
2746 offset
= max(new->file_pos
, key
.offset
);
2747 end
= min(new->file_pos
+ new->len
, key
.offset
+ num_bytes
);
2749 old
->bytenr
= disk_bytenr
;
2750 old
->extent_offset
= extent_offset
;
2751 old
->offset
= offset
- key
.offset
;
2752 old
->len
= end
- offset
;
2755 list_add_tail(&old
->list
, &new->head
);
2761 btrfs_free_path(path
);
2762 atomic_inc(&root
->fs_info
->defrag_running
);
2767 btrfs_free_path(path
);
2769 free_sa_defrag_extent(new);
2773 static void btrfs_release_delalloc_bytes(struct btrfs_root
*root
,
2776 struct btrfs_block_group_cache
*cache
;
2778 cache
= btrfs_lookup_block_group(root
->fs_info
, start
);
2781 spin_lock(&cache
->lock
);
2782 cache
->delalloc_bytes
-= len
;
2783 spin_unlock(&cache
->lock
);
2785 btrfs_put_block_group(cache
);
2788 /* as ordered data IO finishes, this gets called so we can finish
2789 * an ordered extent if the range of bytes in the file it covers are
2792 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent
*ordered_extent
)
2794 struct inode
*inode
= ordered_extent
->inode
;
2795 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2796 struct btrfs_trans_handle
*trans
= NULL
;
2797 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2798 struct extent_state
*cached_state
= NULL
;
2799 struct new_sa_defrag_extent
*new = NULL
;
2800 int compress_type
= 0;
2802 u64 logical_len
= ordered_extent
->len
;
2804 bool truncated
= false;
2806 nolock
= btrfs_is_free_space_inode(inode
);
2808 if (test_bit(BTRFS_ORDERED_IOERR
, &ordered_extent
->flags
)) {
2813 btrfs_free_io_failure_record(inode
, ordered_extent
->file_offset
,
2814 ordered_extent
->file_offset
+
2815 ordered_extent
->len
- 1);
2817 if (test_bit(BTRFS_ORDERED_TRUNCATED
, &ordered_extent
->flags
)) {
2819 logical_len
= ordered_extent
->truncated_len
;
2820 /* Truncated the entire extent, don't bother adding */
2825 if (test_bit(BTRFS_ORDERED_NOCOW
, &ordered_extent
->flags
)) {
2826 BUG_ON(!list_empty(&ordered_extent
->list
)); /* Logic error */
2827 btrfs_ordered_update_i_size(inode
, 0, ordered_extent
);
2829 trans
= btrfs_join_transaction_nolock(root
);
2831 trans
= btrfs_join_transaction(root
);
2832 if (IS_ERR(trans
)) {
2833 ret
= PTR_ERR(trans
);
2837 trans
->block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
2838 ret
= btrfs_update_inode_fallback(trans
, root
, inode
);
2839 if (ret
) /* -ENOMEM or corruption */
2840 btrfs_abort_transaction(trans
, root
, ret
);
2844 lock_extent_bits(io_tree
, ordered_extent
->file_offset
,
2845 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
2848 ret
= test_range_bit(io_tree
, ordered_extent
->file_offset
,
2849 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
2850 EXTENT_DEFRAG
, 1, cached_state
);
2852 u64 last_snapshot
= btrfs_root_last_snapshot(&root
->root_item
);
2853 if (0 && last_snapshot
>= BTRFS_I(inode
)->generation
)
2854 /* the inode is shared */
2855 new = record_old_file_extents(inode
, ordered_extent
);
2857 clear_extent_bit(io_tree
, ordered_extent
->file_offset
,
2858 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
2859 EXTENT_DEFRAG
, 0, 0, &cached_state
, GFP_NOFS
);
2863 trans
= btrfs_join_transaction_nolock(root
);
2865 trans
= btrfs_join_transaction(root
);
2866 if (IS_ERR(trans
)) {
2867 ret
= PTR_ERR(trans
);
2872 trans
->block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
2874 if (test_bit(BTRFS_ORDERED_COMPRESSED
, &ordered_extent
->flags
))
2875 compress_type
= ordered_extent
->compress_type
;
2876 if (test_bit(BTRFS_ORDERED_PREALLOC
, &ordered_extent
->flags
)) {
2877 BUG_ON(compress_type
);
2878 ret
= btrfs_mark_extent_written(trans
, inode
,
2879 ordered_extent
->file_offset
,
2880 ordered_extent
->file_offset
+
2883 BUG_ON(root
== root
->fs_info
->tree_root
);
2884 ret
= insert_reserved_file_extent(trans
, inode
,
2885 ordered_extent
->file_offset
,
2886 ordered_extent
->start
,
2887 ordered_extent
->disk_len
,
2888 logical_len
, logical_len
,
2889 compress_type
, 0, 0,
2890 BTRFS_FILE_EXTENT_REG
);
2892 btrfs_release_delalloc_bytes(root
,
2893 ordered_extent
->start
,
2894 ordered_extent
->disk_len
);
2896 unpin_extent_cache(&BTRFS_I(inode
)->extent_tree
,
2897 ordered_extent
->file_offset
, ordered_extent
->len
,
2900 btrfs_abort_transaction(trans
, root
, ret
);
2904 add_pending_csums(trans
, inode
, ordered_extent
->file_offset
,
2905 &ordered_extent
->list
);
2907 btrfs_ordered_update_i_size(inode
, 0, ordered_extent
);
2908 ret
= btrfs_update_inode_fallback(trans
, root
, inode
);
2909 if (ret
) { /* -ENOMEM or corruption */
2910 btrfs_abort_transaction(trans
, root
, ret
);
2915 unlock_extent_cached(io_tree
, ordered_extent
->file_offset
,
2916 ordered_extent
->file_offset
+
2917 ordered_extent
->len
- 1, &cached_state
, GFP_NOFS
);
2919 if (root
!= root
->fs_info
->tree_root
)
2920 btrfs_delalloc_release_metadata(inode
, ordered_extent
->len
);
2922 btrfs_end_transaction(trans
, root
);
2924 if (ret
|| truncated
) {
2928 start
= ordered_extent
->file_offset
+ logical_len
;
2930 start
= ordered_extent
->file_offset
;
2931 end
= ordered_extent
->file_offset
+ ordered_extent
->len
- 1;
2932 clear_extent_uptodate(io_tree
, start
, end
, NULL
, GFP_NOFS
);
2934 /* Drop the cache for the part of the extent we didn't write. */
2935 btrfs_drop_extent_cache(inode
, start
, end
, 0);
2938 * If the ordered extent had an IOERR or something else went
2939 * wrong we need to return the space for this ordered extent
2940 * back to the allocator. We only free the extent in the
2941 * truncated case if we didn't write out the extent at all.
2943 if ((ret
|| !logical_len
) &&
2944 !test_bit(BTRFS_ORDERED_NOCOW
, &ordered_extent
->flags
) &&
2945 !test_bit(BTRFS_ORDERED_PREALLOC
, &ordered_extent
->flags
))
2946 btrfs_free_reserved_extent(root
, ordered_extent
->start
,
2947 ordered_extent
->disk_len
, 1);
2952 * This needs to be done to make sure anybody waiting knows we are done
2953 * updating everything for this ordered extent.
2955 btrfs_remove_ordered_extent(inode
, ordered_extent
);
2957 /* for snapshot-aware defrag */
2960 free_sa_defrag_extent(new);
2961 atomic_dec(&root
->fs_info
->defrag_running
);
2963 relink_file_extents(new);
2968 btrfs_put_ordered_extent(ordered_extent
);
2969 /* once for the tree */
2970 btrfs_put_ordered_extent(ordered_extent
);
2975 static void finish_ordered_fn(struct btrfs_work
*work
)
2977 struct btrfs_ordered_extent
*ordered_extent
;
2978 ordered_extent
= container_of(work
, struct btrfs_ordered_extent
, work
);
2979 btrfs_finish_ordered_io(ordered_extent
);
2982 static int btrfs_writepage_end_io_hook(struct page
*page
, u64 start
, u64 end
,
2983 struct extent_state
*state
, int uptodate
)
2985 struct inode
*inode
= page
->mapping
->host
;
2986 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2987 struct btrfs_ordered_extent
*ordered_extent
= NULL
;
2988 struct btrfs_workqueue
*wq
;
2989 btrfs_work_func_t func
;
2991 trace_btrfs_writepage_end_io_hook(page
, start
, end
, uptodate
);
2993 ClearPagePrivate2(page
);
2994 if (!btrfs_dec_test_ordered_pending(inode
, &ordered_extent
, start
,
2995 end
- start
+ 1, uptodate
))
2998 if (btrfs_is_free_space_inode(inode
)) {
2999 wq
= root
->fs_info
->endio_freespace_worker
;
3000 func
= btrfs_freespace_write_helper
;
3002 wq
= root
->fs_info
->endio_write_workers
;
3003 func
= btrfs_endio_write_helper
;
3006 btrfs_init_work(&ordered_extent
->work
, func
, finish_ordered_fn
, NULL
,
3008 btrfs_queue_work(wq
, &ordered_extent
->work
);
3013 static int __readpage_endio_check(struct inode
*inode
,
3014 struct btrfs_io_bio
*io_bio
,
3015 int icsum
, struct page
*page
,
3016 int pgoff
, u64 start
, size_t len
)
3021 static DEFINE_RATELIMIT_STATE(_rs
, DEFAULT_RATELIMIT_INTERVAL
,
3022 DEFAULT_RATELIMIT_BURST
);
3024 csum_expected
= *(((u32
*)io_bio
->csum
) + icsum
);
3026 kaddr
= kmap_atomic(page
);
3027 csum
= btrfs_csum_data(kaddr
+ pgoff
, csum
, len
);
3028 btrfs_csum_final(csum
, (char *)&csum
);
3029 if (csum
!= csum_expected
)
3032 kunmap_atomic(kaddr
);
3035 if (__ratelimit(&_rs
))
3036 btrfs_warn(BTRFS_I(inode
)->root
->fs_info
,
3037 "csum failed ino %llu off %llu csum %u expected csum %u",
3038 btrfs_ino(inode
), start
, csum
, csum_expected
);
3039 memset(kaddr
+ pgoff
, 1, len
);
3040 flush_dcache_page(page
);
3041 kunmap_atomic(kaddr
);
3042 if (csum_expected
== 0)
3048 * when reads are done, we need to check csums to verify the data is correct
3049 * if there's a match, we allow the bio to finish. If not, the code in
3050 * extent_io.c will try to find good copies for us.
3052 static int btrfs_readpage_end_io_hook(struct btrfs_io_bio
*io_bio
,
3053 u64 phy_offset
, struct page
*page
,
3054 u64 start
, u64 end
, int mirror
)
3056 size_t offset
= start
- page_offset(page
);
3057 struct inode
*inode
= page
->mapping
->host
;
3058 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
3059 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3061 if (PageChecked(page
)) {
3062 ClearPageChecked(page
);
3066 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
)
3069 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
&&
3070 test_range_bit(io_tree
, start
, end
, EXTENT_NODATASUM
, 1, NULL
)) {
3071 clear_extent_bits(io_tree
, start
, end
, EXTENT_NODATASUM
,
3076 phy_offset
>>= inode
->i_sb
->s_blocksize_bits
;
3077 return __readpage_endio_check(inode
, io_bio
, phy_offset
, page
, offset
,
3078 start
, (size_t)(end
- start
+ 1));
3081 struct delayed_iput
{
3082 struct list_head list
;
3083 struct inode
*inode
;
3086 /* JDM: If this is fs-wide, why can't we add a pointer to
3087 * btrfs_inode instead and avoid the allocation? */
3088 void btrfs_add_delayed_iput(struct inode
*inode
)
3090 struct btrfs_fs_info
*fs_info
= BTRFS_I(inode
)->root
->fs_info
;
3091 struct delayed_iput
*delayed
;
3093 if (atomic_add_unless(&inode
->i_count
, -1, 1))
3096 delayed
= kmalloc(sizeof(*delayed
), GFP_NOFS
| __GFP_NOFAIL
);
3097 delayed
->inode
= inode
;
3099 spin_lock(&fs_info
->delayed_iput_lock
);
3100 list_add_tail(&delayed
->list
, &fs_info
->delayed_iputs
);
3101 spin_unlock(&fs_info
->delayed_iput_lock
);
3104 void btrfs_run_delayed_iputs(struct btrfs_root
*root
)
3107 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3108 struct delayed_iput
*delayed
;
3111 spin_lock(&fs_info
->delayed_iput_lock
);
3112 empty
= list_empty(&fs_info
->delayed_iputs
);
3113 spin_unlock(&fs_info
->delayed_iput_lock
);
3117 down_read(&fs_info
->delayed_iput_sem
);
3119 spin_lock(&fs_info
->delayed_iput_lock
);
3120 list_splice_init(&fs_info
->delayed_iputs
, &list
);
3121 spin_unlock(&fs_info
->delayed_iput_lock
);
3123 while (!list_empty(&list
)) {
3124 delayed
= list_entry(list
.next
, struct delayed_iput
, list
);
3125 list_del(&delayed
->list
);
3126 iput(delayed
->inode
);
3130 up_read(&root
->fs_info
->delayed_iput_sem
);
3134 * This is called in transaction commit time. If there are no orphan
3135 * files in the subvolume, it removes orphan item and frees block_rsv
3138 void btrfs_orphan_commit_root(struct btrfs_trans_handle
*trans
,
3139 struct btrfs_root
*root
)
3141 struct btrfs_block_rsv
*block_rsv
;
3144 if (atomic_read(&root
->orphan_inodes
) ||
3145 root
->orphan_cleanup_state
!= ORPHAN_CLEANUP_DONE
)
3148 spin_lock(&root
->orphan_lock
);
3149 if (atomic_read(&root
->orphan_inodes
)) {
3150 spin_unlock(&root
->orphan_lock
);
3154 if (root
->orphan_cleanup_state
!= ORPHAN_CLEANUP_DONE
) {
3155 spin_unlock(&root
->orphan_lock
);
3159 block_rsv
= root
->orphan_block_rsv
;
3160 root
->orphan_block_rsv
= NULL
;
3161 spin_unlock(&root
->orphan_lock
);
3163 if (test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &root
->state
) &&
3164 btrfs_root_refs(&root
->root_item
) > 0) {
3165 ret
= btrfs_del_orphan_item(trans
, root
->fs_info
->tree_root
,
3166 root
->root_key
.objectid
);
3168 btrfs_abort_transaction(trans
, root
, ret
);
3170 clear_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
,
3175 WARN_ON(block_rsv
->size
> 0);
3176 btrfs_free_block_rsv(root
, block_rsv
);
3181 * This creates an orphan entry for the given inode in case something goes
3182 * wrong in the middle of an unlink/truncate.
3184 * NOTE: caller of this function should reserve 5 units of metadata for
3187 int btrfs_orphan_add(struct btrfs_trans_handle
*trans
, struct inode
*inode
)
3189 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3190 struct btrfs_block_rsv
*block_rsv
= NULL
;
3195 if (!root
->orphan_block_rsv
) {
3196 block_rsv
= btrfs_alloc_block_rsv(root
, BTRFS_BLOCK_RSV_TEMP
);
3201 spin_lock(&root
->orphan_lock
);
3202 if (!root
->orphan_block_rsv
) {
3203 root
->orphan_block_rsv
= block_rsv
;
3204 } else if (block_rsv
) {
3205 btrfs_free_block_rsv(root
, block_rsv
);
3209 if (!test_and_set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
3210 &BTRFS_I(inode
)->runtime_flags
)) {
3213 * For proper ENOSPC handling, we should do orphan
3214 * cleanup when mounting. But this introduces backward
3215 * compatibility issue.
3217 if (!xchg(&root
->orphan_item_inserted
, 1))
3223 atomic_inc(&root
->orphan_inodes
);
3226 if (!test_and_set_bit(BTRFS_INODE_ORPHAN_META_RESERVED
,
3227 &BTRFS_I(inode
)->runtime_flags
))
3229 spin_unlock(&root
->orphan_lock
);
3231 /* grab metadata reservation from transaction handle */
3233 ret
= btrfs_orphan_reserve_metadata(trans
, inode
);
3234 BUG_ON(ret
); /* -ENOSPC in reservation; Logic error? JDM */
3237 /* insert an orphan item to track this unlinked/truncated file */
3239 ret
= btrfs_insert_orphan_item(trans
, root
, btrfs_ino(inode
));
3241 atomic_dec(&root
->orphan_inodes
);
3243 clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED
,
3244 &BTRFS_I(inode
)->runtime_flags
);
3245 btrfs_orphan_release_metadata(inode
);
3247 if (ret
!= -EEXIST
) {
3248 clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
3249 &BTRFS_I(inode
)->runtime_flags
);
3250 btrfs_abort_transaction(trans
, root
, ret
);
3257 /* insert an orphan item to track subvolume contains orphan files */
3259 ret
= btrfs_insert_orphan_item(trans
, root
->fs_info
->tree_root
,
3260 root
->root_key
.objectid
);
3261 if (ret
&& ret
!= -EEXIST
) {
3262 btrfs_abort_transaction(trans
, root
, ret
);
3270 * We have done the truncate/delete so we can go ahead and remove the orphan
3271 * item for this particular inode.
3273 static int btrfs_orphan_del(struct btrfs_trans_handle
*trans
,
3274 struct inode
*inode
)
3276 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3277 int delete_item
= 0;
3278 int release_rsv
= 0;
3281 spin_lock(&root
->orphan_lock
);
3282 if (test_and_clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
3283 &BTRFS_I(inode
)->runtime_flags
))
3286 if (test_and_clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED
,
3287 &BTRFS_I(inode
)->runtime_flags
))
3289 spin_unlock(&root
->orphan_lock
);
3292 atomic_dec(&root
->orphan_inodes
);
3294 ret
= btrfs_del_orphan_item(trans
, root
,
3299 btrfs_orphan_release_metadata(inode
);
3305 * this cleans up any orphans that may be left on the list from the last use
3308 int btrfs_orphan_cleanup(struct btrfs_root
*root
)
3310 struct btrfs_path
*path
;
3311 struct extent_buffer
*leaf
;
3312 struct btrfs_key key
, found_key
;
3313 struct btrfs_trans_handle
*trans
;
3314 struct inode
*inode
;
3315 u64 last_objectid
= 0;
3316 int ret
= 0, nr_unlink
= 0, nr_truncate
= 0;
3318 if (cmpxchg(&root
->orphan_cleanup_state
, 0, ORPHAN_CLEANUP_STARTED
))
3321 path
= btrfs_alloc_path();
3328 key
.objectid
= BTRFS_ORPHAN_OBJECTID
;
3329 key
.type
= BTRFS_ORPHAN_ITEM_KEY
;
3330 key
.offset
= (u64
)-1;
3333 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3338 * if ret == 0 means we found what we were searching for, which
3339 * is weird, but possible, so only screw with path if we didn't
3340 * find the key and see if we have stuff that matches
3344 if (path
->slots
[0] == 0)
3349 /* pull out the item */
3350 leaf
= path
->nodes
[0];
3351 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3353 /* make sure the item matches what we want */
3354 if (found_key
.objectid
!= BTRFS_ORPHAN_OBJECTID
)
3356 if (found_key
.type
!= BTRFS_ORPHAN_ITEM_KEY
)
3359 /* release the path since we're done with it */
3360 btrfs_release_path(path
);
3363 * this is where we are basically btrfs_lookup, without the
3364 * crossing root thing. we store the inode number in the
3365 * offset of the orphan item.
3368 if (found_key
.offset
== last_objectid
) {
3369 btrfs_err(root
->fs_info
,
3370 "Error removing orphan entry, stopping orphan cleanup");
3375 last_objectid
= found_key
.offset
;
3377 found_key
.objectid
= found_key
.offset
;
3378 found_key
.type
= BTRFS_INODE_ITEM_KEY
;
3379 found_key
.offset
= 0;
3380 inode
= btrfs_iget(root
->fs_info
->sb
, &found_key
, root
, NULL
);
3381 ret
= PTR_ERR_OR_ZERO(inode
);
3382 if (ret
&& ret
!= -ESTALE
)
3385 if (ret
== -ESTALE
&& root
== root
->fs_info
->tree_root
) {
3386 struct btrfs_root
*dead_root
;
3387 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3388 int is_dead_root
= 0;
3391 * this is an orphan in the tree root. Currently these
3392 * could come from 2 sources:
3393 * a) a snapshot deletion in progress
3394 * b) a free space cache inode
3395 * We need to distinguish those two, as the snapshot
3396 * orphan must not get deleted.
3397 * find_dead_roots already ran before us, so if this
3398 * is a snapshot deletion, we should find the root
3399 * in the dead_roots list
3401 spin_lock(&fs_info
->trans_lock
);
3402 list_for_each_entry(dead_root
, &fs_info
->dead_roots
,
3404 if (dead_root
->root_key
.objectid
==
3405 found_key
.objectid
) {
3410 spin_unlock(&fs_info
->trans_lock
);
3412 /* prevent this orphan from being found again */
3413 key
.offset
= found_key
.objectid
- 1;
3418 * Inode is already gone but the orphan item is still there,
3419 * kill the orphan item.
3421 if (ret
== -ESTALE
) {
3422 trans
= btrfs_start_transaction(root
, 1);
3423 if (IS_ERR(trans
)) {
3424 ret
= PTR_ERR(trans
);
3427 btrfs_debug(root
->fs_info
, "auto deleting %Lu",
3428 found_key
.objectid
);
3429 ret
= btrfs_del_orphan_item(trans
, root
,
3430 found_key
.objectid
);
3431 btrfs_end_transaction(trans
, root
);
3438 * add this inode to the orphan list so btrfs_orphan_del does
3439 * the proper thing when we hit it
3441 set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
3442 &BTRFS_I(inode
)->runtime_flags
);
3443 atomic_inc(&root
->orphan_inodes
);
3445 /* if we have links, this was a truncate, lets do that */
3446 if (inode
->i_nlink
) {
3447 if (WARN_ON(!S_ISREG(inode
->i_mode
))) {
3453 /* 1 for the orphan item deletion. */
3454 trans
= btrfs_start_transaction(root
, 1);
3455 if (IS_ERR(trans
)) {
3457 ret
= PTR_ERR(trans
);
3460 ret
= btrfs_orphan_add(trans
, inode
);
3461 btrfs_end_transaction(trans
, root
);
3467 ret
= btrfs_truncate(inode
);
3469 btrfs_orphan_del(NULL
, inode
);
3474 /* this will do delete_inode and everything for us */
3479 /* release the path since we're done with it */
3480 btrfs_release_path(path
);
3482 root
->orphan_cleanup_state
= ORPHAN_CLEANUP_DONE
;
3484 if (root
->orphan_block_rsv
)
3485 btrfs_block_rsv_release(root
, root
->orphan_block_rsv
,
3488 if (root
->orphan_block_rsv
||
3489 test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &root
->state
)) {
3490 trans
= btrfs_join_transaction(root
);
3492 btrfs_end_transaction(trans
, root
);
3496 btrfs_debug(root
->fs_info
, "unlinked %d orphans", nr_unlink
);
3498 btrfs_debug(root
->fs_info
, "truncated %d orphans", nr_truncate
);
3502 btrfs_err(root
->fs_info
,
3503 "could not do orphan cleanup %d", ret
);
3504 btrfs_free_path(path
);
3509 * very simple check to peek ahead in the leaf looking for xattrs. If we
3510 * don't find any xattrs, we know there can't be any acls.
3512 * slot is the slot the inode is in, objectid is the objectid of the inode
3514 static noinline
int acls_after_inode_item(struct extent_buffer
*leaf
,
3515 int slot
, u64 objectid
,
3516 int *first_xattr_slot
)
3518 u32 nritems
= btrfs_header_nritems(leaf
);
3519 struct btrfs_key found_key
;
3520 static u64 xattr_access
= 0;
3521 static u64 xattr_default
= 0;
3524 if (!xattr_access
) {
3525 xattr_access
= btrfs_name_hash(POSIX_ACL_XATTR_ACCESS
,
3526 strlen(POSIX_ACL_XATTR_ACCESS
));
3527 xattr_default
= btrfs_name_hash(POSIX_ACL_XATTR_DEFAULT
,
3528 strlen(POSIX_ACL_XATTR_DEFAULT
));
3532 *first_xattr_slot
= -1;
3533 while (slot
< nritems
) {
3534 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
3536 /* we found a different objectid, there must not be acls */
3537 if (found_key
.objectid
!= objectid
)
3540 /* we found an xattr, assume we've got an acl */
3541 if (found_key
.type
== BTRFS_XATTR_ITEM_KEY
) {
3542 if (*first_xattr_slot
== -1)
3543 *first_xattr_slot
= slot
;
3544 if (found_key
.offset
== xattr_access
||
3545 found_key
.offset
== xattr_default
)
3550 * we found a key greater than an xattr key, there can't
3551 * be any acls later on
3553 if (found_key
.type
> BTRFS_XATTR_ITEM_KEY
)
3560 * it goes inode, inode backrefs, xattrs, extents,
3561 * so if there are a ton of hard links to an inode there can
3562 * be a lot of backrefs. Don't waste time searching too hard,
3563 * this is just an optimization
3568 /* we hit the end of the leaf before we found an xattr or
3569 * something larger than an xattr. We have to assume the inode
3572 if (*first_xattr_slot
== -1)
3573 *first_xattr_slot
= slot
;
3578 * read an inode from the btree into the in-memory inode
3580 static void btrfs_read_locked_inode(struct inode
*inode
)
3582 struct btrfs_path
*path
;
3583 struct extent_buffer
*leaf
;
3584 struct btrfs_inode_item
*inode_item
;
3585 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3586 struct btrfs_key location
;
3591 bool filled
= false;
3592 int first_xattr_slot
;
3594 ret
= btrfs_fill_inode(inode
, &rdev
);
3598 path
= btrfs_alloc_path();
3602 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
3604 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
3608 leaf
= path
->nodes
[0];
3613 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
3614 struct btrfs_inode_item
);
3615 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
3616 set_nlink(inode
, btrfs_inode_nlink(leaf
, inode_item
));
3617 i_uid_write(inode
, btrfs_inode_uid(leaf
, inode_item
));
3618 i_gid_write(inode
, btrfs_inode_gid(leaf
, inode_item
));
3619 btrfs_i_size_write(inode
, btrfs_inode_size(leaf
, inode_item
));
3621 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, &inode_item
->atime
);
3622 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, &inode_item
->atime
);
3624 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, &inode_item
->mtime
);
3625 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, &inode_item
->mtime
);
3627 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, &inode_item
->ctime
);
3628 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, &inode_item
->ctime
);
3630 BTRFS_I(inode
)->i_otime
.tv_sec
=
3631 btrfs_timespec_sec(leaf
, &inode_item
->otime
);
3632 BTRFS_I(inode
)->i_otime
.tv_nsec
=
3633 btrfs_timespec_nsec(leaf
, &inode_item
->otime
);
3635 inode_set_bytes(inode
, btrfs_inode_nbytes(leaf
, inode_item
));
3636 BTRFS_I(inode
)->generation
= btrfs_inode_generation(leaf
, inode_item
);
3637 BTRFS_I(inode
)->last_trans
= btrfs_inode_transid(leaf
, inode_item
);
3639 inode
->i_version
= btrfs_inode_sequence(leaf
, inode_item
);
3640 inode
->i_generation
= BTRFS_I(inode
)->generation
;
3642 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
3644 BTRFS_I(inode
)->index_cnt
= (u64
)-1;
3645 BTRFS_I(inode
)->flags
= btrfs_inode_flags(leaf
, inode_item
);
3649 * If we were modified in the current generation and evicted from memory
3650 * and then re-read we need to do a full sync since we don't have any
3651 * idea about which extents were modified before we were evicted from
3654 * This is required for both inode re-read from disk and delayed inode
3655 * in delayed_nodes_tree.
3657 if (BTRFS_I(inode
)->last_trans
== root
->fs_info
->generation
)
3658 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3659 &BTRFS_I(inode
)->runtime_flags
);
3662 if (inode
->i_nlink
!= 1 ||
3663 path
->slots
[0] >= btrfs_header_nritems(leaf
))
3666 btrfs_item_key_to_cpu(leaf
, &location
, path
->slots
[0]);
3667 if (location
.objectid
!= btrfs_ino(inode
))
3670 ptr
= btrfs_item_ptr_offset(leaf
, path
->slots
[0]);
3671 if (location
.type
== BTRFS_INODE_REF_KEY
) {
3672 struct btrfs_inode_ref
*ref
;
3674 ref
= (struct btrfs_inode_ref
*)ptr
;
3675 BTRFS_I(inode
)->dir_index
= btrfs_inode_ref_index(leaf
, ref
);
3676 } else if (location
.type
== BTRFS_INODE_EXTREF_KEY
) {
3677 struct btrfs_inode_extref
*extref
;
3679 extref
= (struct btrfs_inode_extref
*)ptr
;
3680 BTRFS_I(inode
)->dir_index
= btrfs_inode_extref_index(leaf
,
3685 * try to precache a NULL acl entry for files that don't have
3686 * any xattrs or acls
3688 maybe_acls
= acls_after_inode_item(leaf
, path
->slots
[0],
3689 btrfs_ino(inode
), &first_xattr_slot
);
3690 if (first_xattr_slot
!= -1) {
3691 path
->slots
[0] = first_xattr_slot
;
3692 ret
= btrfs_load_inode_props(inode
, path
);
3694 btrfs_err(root
->fs_info
,
3695 "error loading props for ino %llu (root %llu): %d",
3697 root
->root_key
.objectid
, ret
);
3699 btrfs_free_path(path
);
3702 cache_no_acl(inode
);
3704 switch (inode
->i_mode
& S_IFMT
) {
3706 inode
->i_mapping
->a_ops
= &btrfs_aops
;
3707 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
3708 inode
->i_fop
= &btrfs_file_operations
;
3709 inode
->i_op
= &btrfs_file_inode_operations
;
3712 inode
->i_fop
= &btrfs_dir_file_operations
;
3713 if (root
== root
->fs_info
->tree_root
)
3714 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
3716 inode
->i_op
= &btrfs_dir_inode_operations
;
3719 inode
->i_op
= &btrfs_symlink_inode_operations
;
3720 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
3723 inode
->i_op
= &btrfs_special_inode_operations
;
3724 init_special_inode(inode
, inode
->i_mode
, rdev
);
3728 btrfs_update_iflags(inode
);
3732 btrfs_free_path(path
);
3733 make_bad_inode(inode
);
3737 * given a leaf and an inode, copy the inode fields into the leaf
3739 static void fill_inode_item(struct btrfs_trans_handle
*trans
,
3740 struct extent_buffer
*leaf
,
3741 struct btrfs_inode_item
*item
,
3742 struct inode
*inode
)
3744 struct btrfs_map_token token
;
3746 btrfs_init_map_token(&token
);
3748 btrfs_set_token_inode_uid(leaf
, item
, i_uid_read(inode
), &token
);
3749 btrfs_set_token_inode_gid(leaf
, item
, i_gid_read(inode
), &token
);
3750 btrfs_set_token_inode_size(leaf
, item
, BTRFS_I(inode
)->disk_i_size
,
3752 btrfs_set_token_inode_mode(leaf
, item
, inode
->i_mode
, &token
);
3753 btrfs_set_token_inode_nlink(leaf
, item
, inode
->i_nlink
, &token
);
3755 btrfs_set_token_timespec_sec(leaf
, &item
->atime
,
3756 inode
->i_atime
.tv_sec
, &token
);
3757 btrfs_set_token_timespec_nsec(leaf
, &item
->atime
,
3758 inode
->i_atime
.tv_nsec
, &token
);
3760 btrfs_set_token_timespec_sec(leaf
, &item
->mtime
,
3761 inode
->i_mtime
.tv_sec
, &token
);
3762 btrfs_set_token_timespec_nsec(leaf
, &item
->mtime
,
3763 inode
->i_mtime
.tv_nsec
, &token
);
3765 btrfs_set_token_timespec_sec(leaf
, &item
->ctime
,
3766 inode
->i_ctime
.tv_sec
, &token
);
3767 btrfs_set_token_timespec_nsec(leaf
, &item
->ctime
,
3768 inode
->i_ctime
.tv_nsec
, &token
);
3770 btrfs_set_token_timespec_sec(leaf
, &item
->otime
,
3771 BTRFS_I(inode
)->i_otime
.tv_sec
, &token
);
3772 btrfs_set_token_timespec_nsec(leaf
, &item
->otime
,
3773 BTRFS_I(inode
)->i_otime
.tv_nsec
, &token
);
3775 btrfs_set_token_inode_nbytes(leaf
, item
, inode_get_bytes(inode
),
3777 btrfs_set_token_inode_generation(leaf
, item
, BTRFS_I(inode
)->generation
,
3779 btrfs_set_token_inode_sequence(leaf
, item
, inode
->i_version
, &token
);
3780 btrfs_set_token_inode_transid(leaf
, item
, trans
->transid
, &token
);
3781 btrfs_set_token_inode_rdev(leaf
, item
, inode
->i_rdev
, &token
);
3782 btrfs_set_token_inode_flags(leaf
, item
, BTRFS_I(inode
)->flags
, &token
);
3783 btrfs_set_token_inode_block_group(leaf
, item
, 0, &token
);
3787 * copy everything in the in-memory inode into the btree.
3789 static noinline
int btrfs_update_inode_item(struct btrfs_trans_handle
*trans
,
3790 struct btrfs_root
*root
, struct inode
*inode
)
3792 struct btrfs_inode_item
*inode_item
;
3793 struct btrfs_path
*path
;
3794 struct extent_buffer
*leaf
;
3797 path
= btrfs_alloc_path();
3801 path
->leave_spinning
= 1;
3802 ret
= btrfs_lookup_inode(trans
, root
, path
, &BTRFS_I(inode
)->location
,
3810 leaf
= path
->nodes
[0];
3811 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
3812 struct btrfs_inode_item
);
3814 fill_inode_item(trans
, leaf
, inode_item
, inode
);
3815 btrfs_mark_buffer_dirty(leaf
);
3816 btrfs_set_inode_last_trans(trans
, inode
);
3819 btrfs_free_path(path
);
3824 * copy everything in the in-memory inode into the btree.
3826 noinline
int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
3827 struct btrfs_root
*root
, struct inode
*inode
)
3832 * If the inode is a free space inode, we can deadlock during commit
3833 * if we put it into the delayed code.
3835 * The data relocation inode should also be directly updated
3838 if (!btrfs_is_free_space_inode(inode
)
3839 && root
->root_key
.objectid
!= BTRFS_DATA_RELOC_TREE_OBJECTID
3840 && !root
->fs_info
->log_root_recovering
) {
3841 btrfs_update_root_times(trans
, root
);
3843 ret
= btrfs_delayed_update_inode(trans
, root
, inode
);
3845 btrfs_set_inode_last_trans(trans
, inode
);
3849 return btrfs_update_inode_item(trans
, root
, inode
);
3852 noinline
int btrfs_update_inode_fallback(struct btrfs_trans_handle
*trans
,
3853 struct btrfs_root
*root
,
3854 struct inode
*inode
)
3858 ret
= btrfs_update_inode(trans
, root
, inode
);
3860 return btrfs_update_inode_item(trans
, root
, inode
);
3865 * unlink helper that gets used here in inode.c and in the tree logging
3866 * recovery code. It remove a link in a directory with a given name, and
3867 * also drops the back refs in the inode to the directory
3869 static int __btrfs_unlink_inode(struct btrfs_trans_handle
*trans
,
3870 struct btrfs_root
*root
,
3871 struct inode
*dir
, struct inode
*inode
,
3872 const char *name
, int name_len
)
3874 struct btrfs_path
*path
;
3876 struct extent_buffer
*leaf
;
3877 struct btrfs_dir_item
*di
;
3878 struct btrfs_key key
;
3880 u64 ino
= btrfs_ino(inode
);
3881 u64 dir_ino
= btrfs_ino(dir
);
3883 path
= btrfs_alloc_path();
3889 path
->leave_spinning
= 1;
3890 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir_ino
,
3891 name
, name_len
, -1);
3900 leaf
= path
->nodes
[0];
3901 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
3902 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
3905 btrfs_release_path(path
);
3908 * If we don't have dir index, we have to get it by looking up
3909 * the inode ref, since we get the inode ref, remove it directly,
3910 * it is unnecessary to do delayed deletion.
3912 * But if we have dir index, needn't search inode ref to get it.
3913 * Since the inode ref is close to the inode item, it is better
3914 * that we delay to delete it, and just do this deletion when
3915 * we update the inode item.
3917 if (BTRFS_I(inode
)->dir_index
) {
3918 ret
= btrfs_delayed_delete_inode_ref(inode
);
3920 index
= BTRFS_I(inode
)->dir_index
;
3925 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
, ino
,
3928 btrfs_info(root
->fs_info
,
3929 "failed to delete reference to %.*s, inode %llu parent %llu",
3930 name_len
, name
, ino
, dir_ino
);
3931 btrfs_abort_transaction(trans
, root
, ret
);
3935 ret
= btrfs_delete_delayed_dir_index(trans
, root
, dir
, index
);
3937 btrfs_abort_transaction(trans
, root
, ret
);
3941 ret
= btrfs_del_inode_ref_in_log(trans
, root
, name
, name_len
,
3943 if (ret
!= 0 && ret
!= -ENOENT
) {
3944 btrfs_abort_transaction(trans
, root
, ret
);
3948 ret
= btrfs_del_dir_entries_in_log(trans
, root
, name
, name_len
,
3953 btrfs_abort_transaction(trans
, root
, ret
);
3955 btrfs_free_path(path
);
3959 btrfs_i_size_write(dir
, dir
->i_size
- name_len
* 2);
3960 inode_inc_iversion(inode
);
3961 inode_inc_iversion(dir
);
3962 inode
->i_ctime
= dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
3963 ret
= btrfs_update_inode(trans
, root
, dir
);
3968 int btrfs_unlink_inode(struct btrfs_trans_handle
*trans
,
3969 struct btrfs_root
*root
,
3970 struct inode
*dir
, struct inode
*inode
,
3971 const char *name
, int name_len
)
3974 ret
= __btrfs_unlink_inode(trans
, root
, dir
, inode
, name
, name_len
);
3977 ret
= btrfs_update_inode(trans
, root
, inode
);
3983 * helper to start transaction for unlink and rmdir.
3985 * unlink and rmdir are special in btrfs, they do not always free space, so
3986 * if we cannot make our reservations the normal way try and see if there is
3987 * plenty of slack room in the global reserve to migrate, otherwise we cannot
3988 * allow the unlink to occur.
3990 static struct btrfs_trans_handle
*__unlink_start_trans(struct inode
*dir
)
3992 struct btrfs_trans_handle
*trans
;
3993 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3997 * 1 for the possible orphan item
3998 * 1 for the dir item
3999 * 1 for the dir index
4000 * 1 for the inode ref
4003 trans
= btrfs_start_transaction(root
, 5);
4004 if (!IS_ERR(trans
) || PTR_ERR(trans
) != -ENOSPC
)
4007 if (PTR_ERR(trans
) == -ENOSPC
) {
4008 u64 num_bytes
= btrfs_calc_trans_metadata_size(root
, 5);
4010 trans
= btrfs_start_transaction(root
, 0);
4013 ret
= btrfs_cond_migrate_bytes(root
->fs_info
,
4014 &root
->fs_info
->trans_block_rsv
,
4017 btrfs_end_transaction(trans
, root
);
4018 return ERR_PTR(ret
);
4020 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
4021 trans
->bytes_reserved
= num_bytes
;
4026 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
4028 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
4029 struct btrfs_trans_handle
*trans
;
4030 struct inode
*inode
= d_inode(dentry
);
4033 trans
= __unlink_start_trans(dir
);
4035 return PTR_ERR(trans
);
4037 btrfs_record_unlink_dir(trans
, dir
, d_inode(dentry
), 0);
4039 ret
= btrfs_unlink_inode(trans
, root
, dir
, d_inode(dentry
),
4040 dentry
->d_name
.name
, dentry
->d_name
.len
);
4044 if (inode
->i_nlink
== 0) {
4045 ret
= btrfs_orphan_add(trans
, inode
);
4051 btrfs_end_transaction(trans
, root
);
4052 btrfs_btree_balance_dirty(root
);
4056 int btrfs_unlink_subvol(struct btrfs_trans_handle
*trans
,
4057 struct btrfs_root
*root
,
4058 struct inode
*dir
, u64 objectid
,
4059 const char *name
, int name_len
)
4061 struct btrfs_path
*path
;
4062 struct extent_buffer
*leaf
;
4063 struct btrfs_dir_item
*di
;
4064 struct btrfs_key key
;
4067 u64 dir_ino
= btrfs_ino(dir
);
4069 path
= btrfs_alloc_path();
4073 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir_ino
,
4074 name
, name_len
, -1);
4075 if (IS_ERR_OR_NULL(di
)) {
4083 leaf
= path
->nodes
[0];
4084 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
4085 WARN_ON(key
.type
!= BTRFS_ROOT_ITEM_KEY
|| key
.objectid
!= objectid
);
4086 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
4088 btrfs_abort_transaction(trans
, root
, ret
);
4091 btrfs_release_path(path
);
4093 ret
= btrfs_del_root_ref(trans
, root
->fs_info
->tree_root
,
4094 objectid
, root
->root_key
.objectid
,
4095 dir_ino
, &index
, name
, name_len
);
4097 if (ret
!= -ENOENT
) {
4098 btrfs_abort_transaction(trans
, root
, ret
);
4101 di
= btrfs_search_dir_index_item(root
, path
, dir_ino
,
4103 if (IS_ERR_OR_NULL(di
)) {
4108 btrfs_abort_transaction(trans
, root
, ret
);
4112 leaf
= path
->nodes
[0];
4113 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
4114 btrfs_release_path(path
);
4117 btrfs_release_path(path
);
4119 ret
= btrfs_delete_delayed_dir_index(trans
, root
, dir
, index
);
4121 btrfs_abort_transaction(trans
, root
, ret
);
4125 btrfs_i_size_write(dir
, dir
->i_size
- name_len
* 2);
4126 inode_inc_iversion(dir
);
4127 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
4128 ret
= btrfs_update_inode_fallback(trans
, root
, dir
);
4130 btrfs_abort_transaction(trans
, root
, ret
);
4132 btrfs_free_path(path
);
4136 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
4138 struct inode
*inode
= d_inode(dentry
);
4140 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
4141 struct btrfs_trans_handle
*trans
;
4143 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
4145 if (btrfs_ino(inode
) == BTRFS_FIRST_FREE_OBJECTID
)
4148 trans
= __unlink_start_trans(dir
);
4150 return PTR_ERR(trans
);
4152 if (unlikely(btrfs_ino(inode
) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)) {
4153 err
= btrfs_unlink_subvol(trans
, root
, dir
,
4154 BTRFS_I(inode
)->location
.objectid
,
4155 dentry
->d_name
.name
,
4156 dentry
->d_name
.len
);
4160 err
= btrfs_orphan_add(trans
, inode
);
4164 /* now the directory is empty */
4165 err
= btrfs_unlink_inode(trans
, root
, dir
, d_inode(dentry
),
4166 dentry
->d_name
.name
, dentry
->d_name
.len
);
4168 btrfs_i_size_write(inode
, 0);
4170 btrfs_end_transaction(trans
, root
);
4171 btrfs_btree_balance_dirty(root
);
4176 static int truncate_space_check(struct btrfs_trans_handle
*trans
,
4177 struct btrfs_root
*root
,
4182 bytes_deleted
= btrfs_csum_bytes_to_leaves(root
, bytes_deleted
);
4183 ret
= btrfs_block_rsv_add(root
, &root
->fs_info
->trans_block_rsv
,
4184 bytes_deleted
, BTRFS_RESERVE_NO_FLUSH
);
4186 trans
->bytes_reserved
+= bytes_deleted
;
4192 * this can truncate away extent items, csum items and directory items.
4193 * It starts at a high offset and removes keys until it can't find
4194 * any higher than new_size
4196 * csum items that cross the new i_size are truncated to the new size
4199 * min_type is the minimum key type to truncate down to. If set to 0, this
4200 * will kill all the items on this inode, including the INODE_ITEM_KEY.
4202 int btrfs_truncate_inode_items(struct btrfs_trans_handle
*trans
,
4203 struct btrfs_root
*root
,
4204 struct inode
*inode
,
4205 u64 new_size
, u32 min_type
)
4207 struct btrfs_path
*path
;
4208 struct extent_buffer
*leaf
;
4209 struct btrfs_file_extent_item
*fi
;
4210 struct btrfs_key key
;
4211 struct btrfs_key found_key
;
4212 u64 extent_start
= 0;
4213 u64 extent_num_bytes
= 0;
4214 u64 extent_offset
= 0;
4216 u64 last_size
= new_size
;
4217 u32 found_type
= (u8
)-1;
4220 int pending_del_nr
= 0;
4221 int pending_del_slot
= 0;
4222 int extent_type
= -1;
4225 u64 ino
= btrfs_ino(inode
);
4226 u64 bytes_deleted
= 0;
4228 bool should_throttle
= 0;
4229 bool should_end
= 0;
4231 BUG_ON(new_size
> 0 && min_type
!= BTRFS_EXTENT_DATA_KEY
);
4234 * for non-free space inodes and ref cows, we want to back off from
4237 if (!btrfs_is_free_space_inode(inode
) &&
4238 test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
))
4241 path
= btrfs_alloc_path();
4247 * We want to drop from the next block forward in case this new size is
4248 * not block aligned since we will be keeping the last block of the
4249 * extent just the way it is.
4251 if (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) ||
4252 root
== root
->fs_info
->tree_root
)
4253 btrfs_drop_extent_cache(inode
, ALIGN(new_size
,
4254 root
->sectorsize
), (u64
)-1, 0);
4257 * This function is also used to drop the items in the log tree before
4258 * we relog the inode, so if root != BTRFS_I(inode)->root, it means
4259 * it is used to drop the loged items. So we shouldn't kill the delayed
4262 if (min_type
== 0 && root
== BTRFS_I(inode
)->root
)
4263 btrfs_kill_delayed_inode_items(inode
);
4266 key
.offset
= (u64
)-1;
4271 * with a 16K leaf size and 128MB extents, you can actually queue
4272 * up a huge file in a single leaf. Most of the time that
4273 * bytes_deleted is > 0, it will be huge by the time we get here
4275 if (be_nice
&& bytes_deleted
> 32 * 1024 * 1024) {
4276 if (btrfs_should_end_transaction(trans
, root
)) {
4283 path
->leave_spinning
= 1;
4284 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
4291 /* there are no items in the tree for us to truncate, we're
4294 if (path
->slots
[0] == 0)
4301 leaf
= path
->nodes
[0];
4302 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
4303 found_type
= found_key
.type
;
4305 if (found_key
.objectid
!= ino
)
4308 if (found_type
< min_type
)
4311 item_end
= found_key
.offset
;
4312 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
4313 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
4314 struct btrfs_file_extent_item
);
4315 extent_type
= btrfs_file_extent_type(leaf
, fi
);
4316 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
4318 btrfs_file_extent_num_bytes(leaf
, fi
);
4319 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
4320 item_end
+= btrfs_file_extent_inline_len(leaf
,
4321 path
->slots
[0], fi
);
4325 if (found_type
> min_type
) {
4328 if (item_end
< new_size
)
4330 if (found_key
.offset
>= new_size
)
4336 /* FIXME, shrink the extent if the ref count is only 1 */
4337 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
4341 last_size
= found_key
.offset
;
4343 last_size
= new_size
;
4345 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
4347 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
4349 u64 orig_num_bytes
=
4350 btrfs_file_extent_num_bytes(leaf
, fi
);
4351 extent_num_bytes
= ALIGN(new_size
-
4354 btrfs_set_file_extent_num_bytes(leaf
, fi
,
4356 num_dec
= (orig_num_bytes
-
4358 if (test_bit(BTRFS_ROOT_REF_COWS
,
4361 inode_sub_bytes(inode
, num_dec
);
4362 btrfs_mark_buffer_dirty(leaf
);
4365 btrfs_file_extent_disk_num_bytes(leaf
,
4367 extent_offset
= found_key
.offset
-
4368 btrfs_file_extent_offset(leaf
, fi
);
4370 /* FIXME blocksize != 4096 */
4371 num_dec
= btrfs_file_extent_num_bytes(leaf
, fi
);
4372 if (extent_start
!= 0) {
4374 if (test_bit(BTRFS_ROOT_REF_COWS
,
4376 inode_sub_bytes(inode
, num_dec
);
4379 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
4381 * we can't truncate inline items that have had
4385 btrfs_file_extent_compression(leaf
, fi
) == 0 &&
4386 btrfs_file_extent_encryption(leaf
, fi
) == 0 &&
4387 btrfs_file_extent_other_encoding(leaf
, fi
) == 0) {
4388 u32 size
= new_size
- found_key
.offset
;
4390 if (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
))
4391 inode_sub_bytes(inode
, item_end
+ 1 -
4395 * update the ram bytes to properly reflect
4396 * the new size of our item
4398 btrfs_set_file_extent_ram_bytes(leaf
, fi
, size
);
4400 btrfs_file_extent_calc_inline_size(size
);
4401 btrfs_truncate_item(root
, path
, size
, 1);
4402 } else if (test_bit(BTRFS_ROOT_REF_COWS
,
4404 inode_sub_bytes(inode
, item_end
+ 1 -
4410 if (!pending_del_nr
) {
4411 /* no pending yet, add ourselves */
4412 pending_del_slot
= path
->slots
[0];
4414 } else if (pending_del_nr
&&
4415 path
->slots
[0] + 1 == pending_del_slot
) {
4416 /* hop on the pending chunk */
4418 pending_del_slot
= path
->slots
[0];
4425 should_throttle
= 0;
4428 (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) ||
4429 root
== root
->fs_info
->tree_root
)) {
4430 btrfs_set_path_blocking(path
);
4431 bytes_deleted
+= extent_num_bytes
;
4432 ret
= btrfs_free_extent(trans
, root
, extent_start
,
4433 extent_num_bytes
, 0,
4434 btrfs_header_owner(leaf
),
4435 ino
, extent_offset
, 0);
4437 if (btrfs_should_throttle_delayed_refs(trans
, root
))
4438 btrfs_async_run_delayed_refs(root
,
4439 trans
->delayed_ref_updates
* 2, 0);
4441 if (truncate_space_check(trans
, root
,
4442 extent_num_bytes
)) {
4445 if (btrfs_should_throttle_delayed_refs(trans
,
4447 should_throttle
= 1;
4452 if (found_type
== BTRFS_INODE_ITEM_KEY
)
4455 if (path
->slots
[0] == 0 ||
4456 path
->slots
[0] != pending_del_slot
||
4457 should_throttle
|| should_end
) {
4458 if (pending_del_nr
) {
4459 ret
= btrfs_del_items(trans
, root
, path
,
4463 btrfs_abort_transaction(trans
,
4469 btrfs_release_path(path
);
4470 if (should_throttle
) {
4471 unsigned long updates
= trans
->delayed_ref_updates
;
4473 trans
->delayed_ref_updates
= 0;
4474 ret
= btrfs_run_delayed_refs(trans
, root
, updates
* 2);
4480 * if we failed to refill our space rsv, bail out
4481 * and let the transaction restart
4493 if (pending_del_nr
) {
4494 ret
= btrfs_del_items(trans
, root
, path
, pending_del_slot
,
4497 btrfs_abort_transaction(trans
, root
, ret
);
4500 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
)
4501 btrfs_ordered_update_i_size(inode
, last_size
, NULL
);
4503 btrfs_free_path(path
);
4505 if (be_nice
&& bytes_deleted
> 32 * 1024 * 1024) {
4506 unsigned long updates
= trans
->delayed_ref_updates
;
4508 trans
->delayed_ref_updates
= 0;
4509 ret
= btrfs_run_delayed_refs(trans
, root
, updates
* 2);
4518 * btrfs_truncate_page - read, zero a chunk and write a page
4519 * @inode - inode that we're zeroing
4520 * @from - the offset to start zeroing
4521 * @len - the length to zero, 0 to zero the entire range respective to the
4523 * @front - zero up to the offset instead of from the offset on
4525 * This will find the page for the "from" offset and cow the page and zero the
4526 * part we want to zero. This is used with truncate and hole punching.
4528 int btrfs_truncate_page(struct inode
*inode
, loff_t from
, loff_t len
,
4531 struct address_space
*mapping
= inode
->i_mapping
;
4532 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4533 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4534 struct btrfs_ordered_extent
*ordered
;
4535 struct extent_state
*cached_state
= NULL
;
4537 u32 blocksize
= root
->sectorsize
;
4538 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
4539 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
4541 gfp_t mask
= btrfs_alloc_write_mask(mapping
);
4546 if ((offset
& (blocksize
- 1)) == 0 &&
4547 (!len
|| ((len
& (blocksize
- 1)) == 0)))
4549 ret
= btrfs_delalloc_reserve_space(inode
, PAGE_CACHE_SIZE
);
4554 page
= find_or_create_page(mapping
, index
, mask
);
4556 btrfs_delalloc_release_space(inode
, PAGE_CACHE_SIZE
);
4561 page_start
= page_offset(page
);
4562 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
4564 if (!PageUptodate(page
)) {
4565 ret
= btrfs_readpage(NULL
, page
);
4567 if (page
->mapping
!= mapping
) {
4569 page_cache_release(page
);
4572 if (!PageUptodate(page
)) {
4577 wait_on_page_writeback(page
);
4579 lock_extent_bits(io_tree
, page_start
, page_end
, 0, &cached_state
);
4580 set_page_extent_mapped(page
);
4582 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
4584 unlock_extent_cached(io_tree
, page_start
, page_end
,
4585 &cached_state
, GFP_NOFS
);
4587 page_cache_release(page
);
4588 btrfs_start_ordered_extent(inode
, ordered
, 1);
4589 btrfs_put_ordered_extent(ordered
);
4593 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
,
4594 EXTENT_DIRTY
| EXTENT_DELALLOC
|
4595 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
,
4596 0, 0, &cached_state
, GFP_NOFS
);
4598 ret
= btrfs_set_extent_delalloc(inode
, page_start
, page_end
,
4601 unlock_extent_cached(io_tree
, page_start
, page_end
,
4602 &cached_state
, GFP_NOFS
);
4606 if (offset
!= PAGE_CACHE_SIZE
) {
4608 len
= PAGE_CACHE_SIZE
- offset
;
4611 memset(kaddr
, 0, offset
);
4613 memset(kaddr
+ offset
, 0, len
);
4614 flush_dcache_page(page
);
4617 ClearPageChecked(page
);
4618 set_page_dirty(page
);
4619 unlock_extent_cached(io_tree
, page_start
, page_end
, &cached_state
,
4624 btrfs_delalloc_release_space(inode
, PAGE_CACHE_SIZE
);
4626 page_cache_release(page
);
4631 static int maybe_insert_hole(struct btrfs_root
*root
, struct inode
*inode
,
4632 u64 offset
, u64 len
)
4634 struct btrfs_trans_handle
*trans
;
4638 * Still need to make sure the inode looks like it's been updated so
4639 * that any holes get logged if we fsync.
4641 if (btrfs_fs_incompat(root
->fs_info
, NO_HOLES
)) {
4642 BTRFS_I(inode
)->last_trans
= root
->fs_info
->generation
;
4643 BTRFS_I(inode
)->last_sub_trans
= root
->log_transid
;
4644 BTRFS_I(inode
)->last_log_commit
= root
->last_log_commit
;
4649 * 1 - for the one we're dropping
4650 * 1 - for the one we're adding
4651 * 1 - for updating the inode.
4653 trans
= btrfs_start_transaction(root
, 3);
4655 return PTR_ERR(trans
);
4657 ret
= btrfs_drop_extents(trans
, root
, inode
, offset
, offset
+ len
, 1);
4659 btrfs_abort_transaction(trans
, root
, ret
);
4660 btrfs_end_transaction(trans
, root
);
4664 ret
= btrfs_insert_file_extent(trans
, root
, btrfs_ino(inode
), offset
,
4665 0, 0, len
, 0, len
, 0, 0, 0);
4667 btrfs_abort_transaction(trans
, root
, ret
);
4669 btrfs_update_inode(trans
, root
, inode
);
4670 btrfs_end_transaction(trans
, root
);
4675 * This function puts in dummy file extents for the area we're creating a hole
4676 * for. So if we are truncating this file to a larger size we need to insert
4677 * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for
4678 * the range between oldsize and size
4680 int btrfs_cont_expand(struct inode
*inode
, loff_t oldsize
, loff_t size
)
4682 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4683 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4684 struct extent_map
*em
= NULL
;
4685 struct extent_state
*cached_state
= NULL
;
4686 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
4687 u64 hole_start
= ALIGN(oldsize
, root
->sectorsize
);
4688 u64 block_end
= ALIGN(size
, root
->sectorsize
);
4695 * If our size started in the middle of a page we need to zero out the
4696 * rest of the page before we expand the i_size, otherwise we could
4697 * expose stale data.
4699 err
= btrfs_truncate_page(inode
, oldsize
, 0, 0);
4703 if (size
<= hole_start
)
4707 struct btrfs_ordered_extent
*ordered
;
4709 lock_extent_bits(io_tree
, hole_start
, block_end
- 1, 0,
4711 ordered
= btrfs_lookup_ordered_range(inode
, hole_start
,
4712 block_end
- hole_start
);
4715 unlock_extent_cached(io_tree
, hole_start
, block_end
- 1,
4716 &cached_state
, GFP_NOFS
);
4717 btrfs_start_ordered_extent(inode
, ordered
, 1);
4718 btrfs_put_ordered_extent(ordered
);
4721 cur_offset
= hole_start
;
4723 em
= btrfs_get_extent(inode
, NULL
, 0, cur_offset
,
4724 block_end
- cur_offset
, 0);
4730 last_byte
= min(extent_map_end(em
), block_end
);
4731 last_byte
= ALIGN(last_byte
, root
->sectorsize
);
4732 if (!test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
)) {
4733 struct extent_map
*hole_em
;
4734 hole_size
= last_byte
- cur_offset
;
4736 err
= maybe_insert_hole(root
, inode
, cur_offset
,
4740 btrfs_drop_extent_cache(inode
, cur_offset
,
4741 cur_offset
+ hole_size
- 1, 0);
4742 hole_em
= alloc_extent_map();
4744 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
4745 &BTRFS_I(inode
)->runtime_flags
);
4748 hole_em
->start
= cur_offset
;
4749 hole_em
->len
= hole_size
;
4750 hole_em
->orig_start
= cur_offset
;
4752 hole_em
->block_start
= EXTENT_MAP_HOLE
;
4753 hole_em
->block_len
= 0;
4754 hole_em
->orig_block_len
= 0;
4755 hole_em
->ram_bytes
= hole_size
;
4756 hole_em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
4757 hole_em
->compress_type
= BTRFS_COMPRESS_NONE
;
4758 hole_em
->generation
= root
->fs_info
->generation
;
4761 write_lock(&em_tree
->lock
);
4762 err
= add_extent_mapping(em_tree
, hole_em
, 1);
4763 write_unlock(&em_tree
->lock
);
4766 btrfs_drop_extent_cache(inode
, cur_offset
,
4770 free_extent_map(hole_em
);
4773 free_extent_map(em
);
4775 cur_offset
= last_byte
;
4776 if (cur_offset
>= block_end
)
4779 free_extent_map(em
);
4780 unlock_extent_cached(io_tree
, hole_start
, block_end
- 1, &cached_state
,
4785 static int wait_snapshoting_atomic_t(atomic_t
*a
)
4791 static void wait_for_snapshot_creation(struct btrfs_root
*root
)
4796 ret
= btrfs_start_write_no_snapshoting(root
);
4799 wait_on_atomic_t(&root
->will_be_snapshoted
,
4800 wait_snapshoting_atomic_t
,
4801 TASK_UNINTERRUPTIBLE
);
4805 static int btrfs_setsize(struct inode
*inode
, struct iattr
*attr
)
4807 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4808 struct btrfs_trans_handle
*trans
;
4809 loff_t oldsize
= i_size_read(inode
);
4810 loff_t newsize
= attr
->ia_size
;
4811 int mask
= attr
->ia_valid
;
4815 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
4816 * special case where we need to update the times despite not having
4817 * these flags set. For all other operations the VFS set these flags
4818 * explicitly if it wants a timestamp update.
4820 if (newsize
!= oldsize
) {
4821 inode_inc_iversion(inode
);
4822 if (!(mask
& (ATTR_CTIME
| ATTR_MTIME
)))
4823 inode
->i_ctime
= inode
->i_mtime
=
4824 current_fs_time(inode
->i_sb
);
4827 if (newsize
> oldsize
) {
4828 truncate_pagecache(inode
, newsize
);
4830 * Don't do an expanding truncate while snapshoting is ongoing.
4831 * This is to ensure the snapshot captures a fully consistent
4832 * state of this file - if the snapshot captures this expanding
4833 * truncation, it must capture all writes that happened before
4836 wait_for_snapshot_creation(root
);
4837 ret
= btrfs_cont_expand(inode
, oldsize
, newsize
);
4839 btrfs_end_write_no_snapshoting(root
);
4843 trans
= btrfs_start_transaction(root
, 1);
4844 if (IS_ERR(trans
)) {
4845 btrfs_end_write_no_snapshoting(root
);
4846 return PTR_ERR(trans
);
4849 i_size_write(inode
, newsize
);
4850 btrfs_ordered_update_i_size(inode
, i_size_read(inode
), NULL
);
4851 ret
= btrfs_update_inode(trans
, root
, inode
);
4852 btrfs_end_write_no_snapshoting(root
);
4853 btrfs_end_transaction(trans
, root
);
4857 * We're truncating a file that used to have good data down to
4858 * zero. Make sure it gets into the ordered flush list so that
4859 * any new writes get down to disk quickly.
4862 set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE
,
4863 &BTRFS_I(inode
)->runtime_flags
);
4866 * 1 for the orphan item we're going to add
4867 * 1 for the orphan item deletion.
4869 trans
= btrfs_start_transaction(root
, 2);
4871 return PTR_ERR(trans
);
4874 * We need to do this in case we fail at _any_ point during the
4875 * actual truncate. Once we do the truncate_setsize we could
4876 * invalidate pages which forces any outstanding ordered io to
4877 * be instantly completed which will give us extents that need
4878 * to be truncated. If we fail to get an orphan inode down we
4879 * could have left over extents that were never meant to live,
4880 * so we need to garuntee from this point on that everything
4881 * will be consistent.
4883 ret
= btrfs_orphan_add(trans
, inode
);
4884 btrfs_end_transaction(trans
, root
);
4888 /* we don't support swapfiles, so vmtruncate shouldn't fail */
4889 truncate_setsize(inode
, newsize
);
4891 /* Disable nonlocked read DIO to avoid the end less truncate */
4892 btrfs_inode_block_unlocked_dio(inode
);
4893 inode_dio_wait(inode
);
4894 btrfs_inode_resume_unlocked_dio(inode
);
4896 ret
= btrfs_truncate(inode
);
4897 if (ret
&& inode
->i_nlink
) {
4901 * failed to truncate, disk_i_size is only adjusted down
4902 * as we remove extents, so it should represent the true
4903 * size of the inode, so reset the in memory size and
4904 * delete our orphan entry.
4906 trans
= btrfs_join_transaction(root
);
4907 if (IS_ERR(trans
)) {
4908 btrfs_orphan_del(NULL
, inode
);
4911 i_size_write(inode
, BTRFS_I(inode
)->disk_i_size
);
4912 err
= btrfs_orphan_del(trans
, inode
);
4914 btrfs_abort_transaction(trans
, root
, err
);
4915 btrfs_end_transaction(trans
, root
);
4922 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
4924 struct inode
*inode
= d_inode(dentry
);
4925 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4928 if (btrfs_root_readonly(root
))
4931 err
= inode_change_ok(inode
, attr
);
4935 if (S_ISREG(inode
->i_mode
) && (attr
->ia_valid
& ATTR_SIZE
)) {
4936 err
= btrfs_setsize(inode
, attr
);
4941 if (attr
->ia_valid
) {
4942 setattr_copy(inode
, attr
);
4943 inode_inc_iversion(inode
);
4944 err
= btrfs_dirty_inode(inode
);
4946 if (!err
&& attr
->ia_valid
& ATTR_MODE
)
4947 err
= posix_acl_chmod(inode
, inode
->i_mode
);
4954 * While truncating the inode pages during eviction, we get the VFS calling
4955 * btrfs_invalidatepage() against each page of the inode. This is slow because
4956 * the calls to btrfs_invalidatepage() result in a huge amount of calls to
4957 * lock_extent_bits() and clear_extent_bit(), which keep merging and splitting
4958 * extent_state structures over and over, wasting lots of time.
4960 * Therefore if the inode is being evicted, let btrfs_invalidatepage() skip all
4961 * those expensive operations on a per page basis and do only the ordered io
4962 * finishing, while we release here the extent_map and extent_state structures,
4963 * without the excessive merging and splitting.
4965 static void evict_inode_truncate_pages(struct inode
*inode
)
4967 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4968 struct extent_map_tree
*map_tree
= &BTRFS_I(inode
)->extent_tree
;
4969 struct rb_node
*node
;
4971 ASSERT(inode
->i_state
& I_FREEING
);
4972 truncate_inode_pages_final(&inode
->i_data
);
4974 write_lock(&map_tree
->lock
);
4975 while (!RB_EMPTY_ROOT(&map_tree
->map
)) {
4976 struct extent_map
*em
;
4978 node
= rb_first(&map_tree
->map
);
4979 em
= rb_entry(node
, struct extent_map
, rb_node
);
4980 clear_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
4981 clear_bit(EXTENT_FLAG_LOGGING
, &em
->flags
);
4982 remove_extent_mapping(map_tree
, em
);
4983 free_extent_map(em
);
4984 if (need_resched()) {
4985 write_unlock(&map_tree
->lock
);
4987 write_lock(&map_tree
->lock
);
4990 write_unlock(&map_tree
->lock
);
4993 * Keep looping until we have no more ranges in the io tree.
4994 * We can have ongoing bios started by readpages (called from readahead)
4995 * that have their endio callback (extent_io.c:end_bio_extent_readpage)
4996 * still in progress (unlocked the pages in the bio but did not yet
4997 * unlocked the ranges in the io tree). Therefore this means some
4998 * ranges can still be locked and eviction started because before
4999 * submitting those bios, which are executed by a separate task (work
5000 * queue kthread), inode references (inode->i_count) were not taken
5001 * (which would be dropped in the end io callback of each bio).
5002 * Therefore here we effectively end up waiting for those bios and
5003 * anyone else holding locked ranges without having bumped the inode's
5004 * reference count - if we don't do it, when they access the inode's
5005 * io_tree to unlock a range it may be too late, leading to an
5006 * use-after-free issue.
5008 spin_lock(&io_tree
->lock
);
5009 while (!RB_EMPTY_ROOT(&io_tree
->state
)) {
5010 struct extent_state
*state
;
5011 struct extent_state
*cached_state
= NULL
;
5015 node
= rb_first(&io_tree
->state
);
5016 state
= rb_entry(node
, struct extent_state
, rb_node
);
5017 start
= state
->start
;
5019 spin_unlock(&io_tree
->lock
);
5021 lock_extent_bits(io_tree
, start
, end
, 0, &cached_state
);
5022 clear_extent_bit(io_tree
, start
, end
,
5023 EXTENT_LOCKED
| EXTENT_DIRTY
|
5024 EXTENT_DELALLOC
| EXTENT_DO_ACCOUNTING
|
5025 EXTENT_DEFRAG
, 1, 1,
5026 &cached_state
, GFP_NOFS
);
5029 spin_lock(&io_tree
->lock
);
5031 spin_unlock(&io_tree
->lock
);
5034 void btrfs_evict_inode(struct inode
*inode
)
5036 struct btrfs_trans_handle
*trans
;
5037 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5038 struct btrfs_block_rsv
*rsv
, *global_rsv
;
5039 int steal_from_global
= 0;
5040 u64 min_size
= btrfs_calc_trunc_metadata_size(root
, 1);
5043 trace_btrfs_inode_evict(inode
);
5045 evict_inode_truncate_pages(inode
);
5047 if (inode
->i_nlink
&&
5048 ((btrfs_root_refs(&root
->root_item
) != 0 &&
5049 root
->root_key
.objectid
!= BTRFS_ROOT_TREE_OBJECTID
) ||
5050 btrfs_is_free_space_inode(inode
)))
5053 if (is_bad_inode(inode
)) {
5054 btrfs_orphan_del(NULL
, inode
);
5057 /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */
5058 btrfs_wait_ordered_range(inode
, 0, (u64
)-1);
5060 btrfs_free_io_failure_record(inode
, 0, (u64
)-1);
5062 if (root
->fs_info
->log_root_recovering
) {
5063 BUG_ON(test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
5064 &BTRFS_I(inode
)->runtime_flags
));
5068 if (inode
->i_nlink
> 0) {
5069 BUG_ON(btrfs_root_refs(&root
->root_item
) != 0 &&
5070 root
->root_key
.objectid
!= BTRFS_ROOT_TREE_OBJECTID
);
5074 ret
= btrfs_commit_inode_delayed_inode(inode
);
5076 btrfs_orphan_del(NULL
, inode
);
5080 rsv
= btrfs_alloc_block_rsv(root
, BTRFS_BLOCK_RSV_TEMP
);
5082 btrfs_orphan_del(NULL
, inode
);
5085 rsv
->size
= min_size
;
5087 global_rsv
= &root
->fs_info
->global_block_rsv
;
5089 btrfs_i_size_write(inode
, 0);
5092 * This is a bit simpler than btrfs_truncate since we've already
5093 * reserved our space for our orphan item in the unlink, so we just
5094 * need to reserve some slack space in case we add bytes and update
5095 * inode item when doing the truncate.
5098 ret
= btrfs_block_rsv_refill(root
, rsv
, min_size
,
5099 BTRFS_RESERVE_FLUSH_LIMIT
);
5102 * Try and steal from the global reserve since we will
5103 * likely not use this space anyway, we want to try as
5104 * hard as possible to get this to work.
5107 steal_from_global
++;
5109 steal_from_global
= 0;
5113 * steal_from_global == 0: we reserved stuff, hooray!
5114 * steal_from_global == 1: we didn't reserve stuff, boo!
5115 * steal_from_global == 2: we've committed, still not a lot of
5116 * room but maybe we'll have room in the global reserve this
5118 * steal_from_global == 3: abandon all hope!
5120 if (steal_from_global
> 2) {
5121 btrfs_warn(root
->fs_info
,
5122 "Could not get space for a delete, will truncate on mount %d",
5124 btrfs_orphan_del(NULL
, inode
);
5125 btrfs_free_block_rsv(root
, rsv
);
5129 trans
= btrfs_join_transaction(root
);
5130 if (IS_ERR(trans
)) {
5131 btrfs_orphan_del(NULL
, inode
);
5132 btrfs_free_block_rsv(root
, rsv
);
5137 * We can't just steal from the global reserve, we need tomake
5138 * sure there is room to do it, if not we need to commit and try
5141 if (steal_from_global
) {
5142 if (!btrfs_check_space_for_delayed_refs(trans
, root
))
5143 ret
= btrfs_block_rsv_migrate(global_rsv
, rsv
,
5150 * Couldn't steal from the global reserve, we have too much
5151 * pending stuff built up, commit the transaction and try it
5155 ret
= btrfs_commit_transaction(trans
, root
);
5157 btrfs_orphan_del(NULL
, inode
);
5158 btrfs_free_block_rsv(root
, rsv
);
5163 steal_from_global
= 0;
5166 trans
->block_rsv
= rsv
;
5168 ret
= btrfs_truncate_inode_items(trans
, root
, inode
, 0, 0);
5169 if (ret
!= -ENOSPC
&& ret
!= -EAGAIN
)
5172 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
5173 btrfs_end_transaction(trans
, root
);
5175 btrfs_btree_balance_dirty(root
);
5178 btrfs_free_block_rsv(root
, rsv
);
5181 * Errors here aren't a big deal, it just means we leave orphan items
5182 * in the tree. They will be cleaned up on the next mount.
5185 trans
->block_rsv
= root
->orphan_block_rsv
;
5186 btrfs_orphan_del(trans
, inode
);
5188 btrfs_orphan_del(NULL
, inode
);
5191 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
5192 if (!(root
== root
->fs_info
->tree_root
||
5193 root
->root_key
.objectid
== BTRFS_TREE_RELOC_OBJECTID
))
5194 btrfs_return_ino(root
, btrfs_ino(inode
));
5196 btrfs_end_transaction(trans
, root
);
5197 btrfs_btree_balance_dirty(root
);
5199 btrfs_remove_delayed_node(inode
);
5205 * this returns the key found in the dir entry in the location pointer.
5206 * If no dir entries were found, location->objectid is 0.
5208 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
5209 struct btrfs_key
*location
)
5211 const char *name
= dentry
->d_name
.name
;
5212 int namelen
= dentry
->d_name
.len
;
5213 struct btrfs_dir_item
*di
;
5214 struct btrfs_path
*path
;
5215 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
5218 path
= btrfs_alloc_path();
5222 di
= btrfs_lookup_dir_item(NULL
, root
, path
, btrfs_ino(dir
), name
,
5227 if (IS_ERR_OR_NULL(di
))
5230 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
5232 btrfs_free_path(path
);
5235 location
->objectid
= 0;
5240 * when we hit a tree root in a directory, the btrfs part of the inode
5241 * needs to be changed to reflect the root directory of the tree root. This
5242 * is kind of like crossing a mount point.
5244 static int fixup_tree_root_location(struct btrfs_root
*root
,
5246 struct dentry
*dentry
,
5247 struct btrfs_key
*location
,
5248 struct btrfs_root
**sub_root
)
5250 struct btrfs_path
*path
;
5251 struct btrfs_root
*new_root
;
5252 struct btrfs_root_ref
*ref
;
5253 struct extent_buffer
*leaf
;
5254 struct btrfs_key key
;
5258 path
= btrfs_alloc_path();
5265 key
.objectid
= BTRFS_I(dir
)->root
->root_key
.objectid
;
5266 key
.type
= BTRFS_ROOT_REF_KEY
;
5267 key
.offset
= location
->objectid
;
5269 ret
= btrfs_search_slot(NULL
, root
->fs_info
->tree_root
, &key
, path
,
5277 leaf
= path
->nodes
[0];
5278 ref
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_root_ref
);
5279 if (btrfs_root_ref_dirid(leaf
, ref
) != btrfs_ino(dir
) ||
5280 btrfs_root_ref_name_len(leaf
, ref
) != dentry
->d_name
.len
)
5283 ret
= memcmp_extent_buffer(leaf
, dentry
->d_name
.name
,
5284 (unsigned long)(ref
+ 1),
5285 dentry
->d_name
.len
);
5289 btrfs_release_path(path
);
5291 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, location
);
5292 if (IS_ERR(new_root
)) {
5293 err
= PTR_ERR(new_root
);
5297 *sub_root
= new_root
;
5298 location
->objectid
= btrfs_root_dirid(&new_root
->root_item
);
5299 location
->type
= BTRFS_INODE_ITEM_KEY
;
5300 location
->offset
= 0;
5303 btrfs_free_path(path
);
5307 static void inode_tree_add(struct inode
*inode
)
5309 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5310 struct btrfs_inode
*entry
;
5312 struct rb_node
*parent
;
5313 struct rb_node
*new = &BTRFS_I(inode
)->rb_node
;
5314 u64 ino
= btrfs_ino(inode
);
5316 if (inode_unhashed(inode
))
5319 spin_lock(&root
->inode_lock
);
5320 p
= &root
->inode_tree
.rb_node
;
5323 entry
= rb_entry(parent
, struct btrfs_inode
, rb_node
);
5325 if (ino
< btrfs_ino(&entry
->vfs_inode
))
5326 p
= &parent
->rb_left
;
5327 else if (ino
> btrfs_ino(&entry
->vfs_inode
))
5328 p
= &parent
->rb_right
;
5330 WARN_ON(!(entry
->vfs_inode
.i_state
&
5331 (I_WILL_FREE
| I_FREEING
)));
5332 rb_replace_node(parent
, new, &root
->inode_tree
);
5333 RB_CLEAR_NODE(parent
);
5334 spin_unlock(&root
->inode_lock
);
5338 rb_link_node(new, parent
, p
);
5339 rb_insert_color(new, &root
->inode_tree
);
5340 spin_unlock(&root
->inode_lock
);
5343 static void inode_tree_del(struct inode
*inode
)
5345 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5348 spin_lock(&root
->inode_lock
);
5349 if (!RB_EMPTY_NODE(&BTRFS_I(inode
)->rb_node
)) {
5350 rb_erase(&BTRFS_I(inode
)->rb_node
, &root
->inode_tree
);
5351 RB_CLEAR_NODE(&BTRFS_I(inode
)->rb_node
);
5352 empty
= RB_EMPTY_ROOT(&root
->inode_tree
);
5354 spin_unlock(&root
->inode_lock
);
5356 if (empty
&& btrfs_root_refs(&root
->root_item
) == 0) {
5357 synchronize_srcu(&root
->fs_info
->subvol_srcu
);
5358 spin_lock(&root
->inode_lock
);
5359 empty
= RB_EMPTY_ROOT(&root
->inode_tree
);
5360 spin_unlock(&root
->inode_lock
);
5362 btrfs_add_dead_root(root
);
5366 void btrfs_invalidate_inodes(struct btrfs_root
*root
)
5368 struct rb_node
*node
;
5369 struct rb_node
*prev
;
5370 struct btrfs_inode
*entry
;
5371 struct inode
*inode
;
5374 if (!test_bit(BTRFS_FS_STATE_ERROR
, &root
->fs_info
->fs_state
))
5375 WARN_ON(btrfs_root_refs(&root
->root_item
) != 0);
5377 spin_lock(&root
->inode_lock
);
5379 node
= root
->inode_tree
.rb_node
;
5383 entry
= rb_entry(node
, struct btrfs_inode
, rb_node
);
5385 if (objectid
< btrfs_ino(&entry
->vfs_inode
))
5386 node
= node
->rb_left
;
5387 else if (objectid
> btrfs_ino(&entry
->vfs_inode
))
5388 node
= node
->rb_right
;
5394 entry
= rb_entry(prev
, struct btrfs_inode
, rb_node
);
5395 if (objectid
<= btrfs_ino(&entry
->vfs_inode
)) {
5399 prev
= rb_next(prev
);
5403 entry
= rb_entry(node
, struct btrfs_inode
, rb_node
);
5404 objectid
= btrfs_ino(&entry
->vfs_inode
) + 1;
5405 inode
= igrab(&entry
->vfs_inode
);
5407 spin_unlock(&root
->inode_lock
);
5408 if (atomic_read(&inode
->i_count
) > 1)
5409 d_prune_aliases(inode
);
5411 * btrfs_drop_inode will have it removed from
5412 * the inode cache when its usage count
5417 spin_lock(&root
->inode_lock
);
5421 if (cond_resched_lock(&root
->inode_lock
))
5424 node
= rb_next(node
);
5426 spin_unlock(&root
->inode_lock
);
5429 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
5431 struct btrfs_iget_args
*args
= p
;
5432 inode
->i_ino
= args
->location
->objectid
;
5433 memcpy(&BTRFS_I(inode
)->location
, args
->location
,
5434 sizeof(*args
->location
));
5435 BTRFS_I(inode
)->root
= args
->root
;
5439 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
5441 struct btrfs_iget_args
*args
= opaque
;
5442 return args
->location
->objectid
== BTRFS_I(inode
)->location
.objectid
&&
5443 args
->root
== BTRFS_I(inode
)->root
;
5446 static struct inode
*btrfs_iget_locked(struct super_block
*s
,
5447 struct btrfs_key
*location
,
5448 struct btrfs_root
*root
)
5450 struct inode
*inode
;
5451 struct btrfs_iget_args args
;
5452 unsigned long hashval
= btrfs_inode_hash(location
->objectid
, root
);
5454 args
.location
= location
;
5457 inode
= iget5_locked(s
, hashval
, btrfs_find_actor
,
5458 btrfs_init_locked_inode
,
5463 /* Get an inode object given its location and corresponding root.
5464 * Returns in *is_new if the inode was read from disk
5466 struct inode
*btrfs_iget(struct super_block
*s
, struct btrfs_key
*location
,
5467 struct btrfs_root
*root
, int *new)
5469 struct inode
*inode
;
5471 inode
= btrfs_iget_locked(s
, location
, root
);
5473 return ERR_PTR(-ENOMEM
);
5475 if (inode
->i_state
& I_NEW
) {
5476 btrfs_read_locked_inode(inode
);
5477 if (!is_bad_inode(inode
)) {
5478 inode_tree_add(inode
);
5479 unlock_new_inode(inode
);
5483 unlock_new_inode(inode
);
5485 inode
= ERR_PTR(-ESTALE
);
5492 static struct inode
*new_simple_dir(struct super_block
*s
,
5493 struct btrfs_key
*key
,
5494 struct btrfs_root
*root
)
5496 struct inode
*inode
= new_inode(s
);
5499 return ERR_PTR(-ENOMEM
);
5501 BTRFS_I(inode
)->root
= root
;
5502 memcpy(&BTRFS_I(inode
)->location
, key
, sizeof(*key
));
5503 set_bit(BTRFS_INODE_DUMMY
, &BTRFS_I(inode
)->runtime_flags
);
5505 inode
->i_ino
= BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
;
5506 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
5507 inode
->i_fop
= &simple_dir_operations
;
5508 inode
->i_mode
= S_IFDIR
| S_IRUGO
| S_IWUSR
| S_IXUGO
;
5509 inode
->i_mtime
= CURRENT_TIME
;
5510 inode
->i_atime
= inode
->i_mtime
;
5511 inode
->i_ctime
= inode
->i_mtime
;
5512 BTRFS_I(inode
)->i_otime
= inode
->i_mtime
;
5517 struct inode
*btrfs_lookup_dentry(struct inode
*dir
, struct dentry
*dentry
)
5519 struct inode
*inode
;
5520 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
5521 struct btrfs_root
*sub_root
= root
;
5522 struct btrfs_key location
;
5526 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
5527 return ERR_PTR(-ENAMETOOLONG
);
5529 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
5531 return ERR_PTR(ret
);
5533 if (location
.objectid
== 0)
5534 return ERR_PTR(-ENOENT
);
5536 if (location
.type
== BTRFS_INODE_ITEM_KEY
) {
5537 inode
= btrfs_iget(dir
->i_sb
, &location
, root
, NULL
);
5541 BUG_ON(location
.type
!= BTRFS_ROOT_ITEM_KEY
);
5543 index
= srcu_read_lock(&root
->fs_info
->subvol_srcu
);
5544 ret
= fixup_tree_root_location(root
, dir
, dentry
,
5545 &location
, &sub_root
);
5548 inode
= ERR_PTR(ret
);
5550 inode
= new_simple_dir(dir
->i_sb
, &location
, sub_root
);
5552 inode
= btrfs_iget(dir
->i_sb
, &location
, sub_root
, NULL
);
5554 srcu_read_unlock(&root
->fs_info
->subvol_srcu
, index
);
5556 if (!IS_ERR(inode
) && root
!= sub_root
) {
5557 down_read(&root
->fs_info
->cleanup_work_sem
);
5558 if (!(inode
->i_sb
->s_flags
& MS_RDONLY
))
5559 ret
= btrfs_orphan_cleanup(sub_root
);
5560 up_read(&root
->fs_info
->cleanup_work_sem
);
5563 inode
= ERR_PTR(ret
);
5570 static int btrfs_dentry_delete(const struct dentry
*dentry
)
5572 struct btrfs_root
*root
;
5573 struct inode
*inode
= d_inode(dentry
);
5575 if (!inode
&& !IS_ROOT(dentry
))
5576 inode
= d_inode(dentry
->d_parent
);
5579 root
= BTRFS_I(inode
)->root
;
5580 if (btrfs_root_refs(&root
->root_item
) == 0)
5583 if (btrfs_ino(inode
) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)
5589 static void btrfs_dentry_release(struct dentry
*dentry
)
5591 kfree(dentry
->d_fsdata
);
5594 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
5597 struct inode
*inode
;
5599 inode
= btrfs_lookup_dentry(dir
, dentry
);
5600 if (IS_ERR(inode
)) {
5601 if (PTR_ERR(inode
) == -ENOENT
)
5604 return ERR_CAST(inode
);
5607 return d_splice_alias(inode
, dentry
);
5610 unsigned char btrfs_filetype_table
[] = {
5611 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
5614 static int btrfs_real_readdir(struct file
*file
, struct dir_context
*ctx
)
5616 struct inode
*inode
= file_inode(file
);
5617 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5618 struct btrfs_item
*item
;
5619 struct btrfs_dir_item
*di
;
5620 struct btrfs_key key
;
5621 struct btrfs_key found_key
;
5622 struct btrfs_path
*path
;
5623 struct list_head ins_list
;
5624 struct list_head del_list
;
5626 struct extent_buffer
*leaf
;
5628 unsigned char d_type
;
5633 int key_type
= BTRFS_DIR_INDEX_KEY
;
5637 int is_curr
= 0; /* ctx->pos points to the current index? */
5639 /* FIXME, use a real flag for deciding about the key type */
5640 if (root
->fs_info
->tree_root
== root
)
5641 key_type
= BTRFS_DIR_ITEM_KEY
;
5643 if (!dir_emit_dots(file
, ctx
))
5646 path
= btrfs_alloc_path();
5652 if (key_type
== BTRFS_DIR_INDEX_KEY
) {
5653 INIT_LIST_HEAD(&ins_list
);
5654 INIT_LIST_HEAD(&del_list
);
5655 btrfs_get_delayed_items(inode
, &ins_list
, &del_list
);
5658 key
.type
= key_type
;
5659 key
.offset
= ctx
->pos
;
5660 key
.objectid
= btrfs_ino(inode
);
5662 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
5667 leaf
= path
->nodes
[0];
5668 slot
= path
->slots
[0];
5669 if (slot
>= btrfs_header_nritems(leaf
)) {
5670 ret
= btrfs_next_leaf(root
, path
);
5678 item
= btrfs_item_nr(slot
);
5679 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
5681 if (found_key
.objectid
!= key
.objectid
)
5683 if (found_key
.type
!= key_type
)
5685 if (found_key
.offset
< ctx
->pos
)
5687 if (key_type
== BTRFS_DIR_INDEX_KEY
&&
5688 btrfs_should_delete_dir_index(&del_list
,
5692 ctx
->pos
= found_key
.offset
;
5695 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
5697 di_total
= btrfs_item_size(leaf
, item
);
5699 while (di_cur
< di_total
) {
5700 struct btrfs_key location
;
5702 if (verify_dir_item(root
, leaf
, di
))
5705 name_len
= btrfs_dir_name_len(leaf
, di
);
5706 if (name_len
<= sizeof(tmp_name
)) {
5707 name_ptr
= tmp_name
;
5709 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
5715 read_extent_buffer(leaf
, name_ptr
,
5716 (unsigned long)(di
+ 1), name_len
);
5718 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
5719 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
5722 /* is this a reference to our own snapshot? If so
5725 * In contrast to old kernels, we insert the snapshot's
5726 * dir item and dir index after it has been created, so
5727 * we won't find a reference to our own snapshot. We
5728 * still keep the following code for backward
5731 if (location
.type
== BTRFS_ROOT_ITEM_KEY
&&
5732 location
.objectid
== root
->root_key
.objectid
) {
5736 over
= !dir_emit(ctx
, name_ptr
, name_len
,
5737 location
.objectid
, d_type
);
5740 if (name_ptr
!= tmp_name
)
5745 di_len
= btrfs_dir_name_len(leaf
, di
) +
5746 btrfs_dir_data_len(leaf
, di
) + sizeof(*di
);
5748 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
5754 if (key_type
== BTRFS_DIR_INDEX_KEY
) {
5757 ret
= btrfs_readdir_delayed_dir_index(ctx
, &ins_list
);
5762 /* Reached end of directory/root. Bump pos past the last item. */
5766 * Stop new entries from being returned after we return the last
5769 * New directory entries are assigned a strictly increasing
5770 * offset. This means that new entries created during readdir
5771 * are *guaranteed* to be seen in the future by that readdir.
5772 * This has broken buggy programs which operate on names as
5773 * they're returned by readdir. Until we re-use freed offsets
5774 * we have this hack to stop new entries from being returned
5775 * under the assumption that they'll never reach this huge
5778 * This is being careful not to overflow 32bit loff_t unless the
5779 * last entry requires it because doing so has broken 32bit apps
5782 if (key_type
== BTRFS_DIR_INDEX_KEY
) {
5783 if (ctx
->pos
>= INT_MAX
)
5784 ctx
->pos
= LLONG_MAX
;
5791 if (key_type
== BTRFS_DIR_INDEX_KEY
)
5792 btrfs_put_delayed_items(&ins_list
, &del_list
);
5793 btrfs_free_path(path
);
5797 int btrfs_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
5799 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5800 struct btrfs_trans_handle
*trans
;
5802 bool nolock
= false;
5804 if (test_bit(BTRFS_INODE_DUMMY
, &BTRFS_I(inode
)->runtime_flags
))
5807 if (btrfs_fs_closing(root
->fs_info
) && btrfs_is_free_space_inode(inode
))
5810 if (wbc
->sync_mode
== WB_SYNC_ALL
) {
5812 trans
= btrfs_join_transaction_nolock(root
);
5814 trans
= btrfs_join_transaction(root
);
5816 return PTR_ERR(trans
);
5817 ret
= btrfs_commit_transaction(trans
, root
);
5823 * This is somewhat expensive, updating the tree every time the
5824 * inode changes. But, it is most likely to find the inode in cache.
5825 * FIXME, needs more benchmarking...there are no reasons other than performance
5826 * to keep or drop this code.
5828 static int btrfs_dirty_inode(struct inode
*inode
)
5830 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5831 struct btrfs_trans_handle
*trans
;
5834 if (test_bit(BTRFS_INODE_DUMMY
, &BTRFS_I(inode
)->runtime_flags
))
5837 trans
= btrfs_join_transaction(root
);
5839 return PTR_ERR(trans
);
5841 ret
= btrfs_update_inode(trans
, root
, inode
);
5842 if (ret
&& ret
== -ENOSPC
) {
5843 /* whoops, lets try again with the full transaction */
5844 btrfs_end_transaction(trans
, root
);
5845 trans
= btrfs_start_transaction(root
, 1);
5847 return PTR_ERR(trans
);
5849 ret
= btrfs_update_inode(trans
, root
, inode
);
5851 btrfs_end_transaction(trans
, root
);
5852 if (BTRFS_I(inode
)->delayed_node
)
5853 btrfs_balance_delayed_items(root
);
5859 * This is a copy of file_update_time. We need this so we can return error on
5860 * ENOSPC for updating the inode in the case of file write and mmap writes.
5862 static int btrfs_update_time(struct inode
*inode
, struct timespec
*now
,
5865 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5867 if (btrfs_root_readonly(root
))
5870 if (flags
& S_VERSION
)
5871 inode_inc_iversion(inode
);
5872 if (flags
& S_CTIME
)
5873 inode
->i_ctime
= *now
;
5874 if (flags
& S_MTIME
)
5875 inode
->i_mtime
= *now
;
5876 if (flags
& S_ATIME
)
5877 inode
->i_atime
= *now
;
5878 return btrfs_dirty_inode(inode
);
5882 * find the highest existing sequence number in a directory
5883 * and then set the in-memory index_cnt variable to reflect
5884 * free sequence numbers
5886 static int btrfs_set_inode_index_count(struct inode
*inode
)
5888 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5889 struct btrfs_key key
, found_key
;
5890 struct btrfs_path
*path
;
5891 struct extent_buffer
*leaf
;
5894 key
.objectid
= btrfs_ino(inode
);
5895 key
.type
= BTRFS_DIR_INDEX_KEY
;
5896 key
.offset
= (u64
)-1;
5898 path
= btrfs_alloc_path();
5902 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
5905 /* FIXME: we should be able to handle this */
5911 * MAGIC NUMBER EXPLANATION:
5912 * since we search a directory based on f_pos we have to start at 2
5913 * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody
5914 * else has to start at 2
5916 if (path
->slots
[0] == 0) {
5917 BTRFS_I(inode
)->index_cnt
= 2;
5923 leaf
= path
->nodes
[0];
5924 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
5926 if (found_key
.objectid
!= btrfs_ino(inode
) ||
5927 found_key
.type
!= BTRFS_DIR_INDEX_KEY
) {
5928 BTRFS_I(inode
)->index_cnt
= 2;
5932 BTRFS_I(inode
)->index_cnt
= found_key
.offset
+ 1;
5934 btrfs_free_path(path
);
5939 * helper to find a free sequence number in a given directory. This current
5940 * code is very simple, later versions will do smarter things in the btree
5942 int btrfs_set_inode_index(struct inode
*dir
, u64
*index
)
5946 if (BTRFS_I(dir
)->index_cnt
== (u64
)-1) {
5947 ret
= btrfs_inode_delayed_dir_index_count(dir
);
5949 ret
= btrfs_set_inode_index_count(dir
);
5955 *index
= BTRFS_I(dir
)->index_cnt
;
5956 BTRFS_I(dir
)->index_cnt
++;
5961 static int btrfs_insert_inode_locked(struct inode
*inode
)
5963 struct btrfs_iget_args args
;
5964 args
.location
= &BTRFS_I(inode
)->location
;
5965 args
.root
= BTRFS_I(inode
)->root
;
5967 return insert_inode_locked4(inode
,
5968 btrfs_inode_hash(inode
->i_ino
, BTRFS_I(inode
)->root
),
5969 btrfs_find_actor
, &args
);
5972 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
5973 struct btrfs_root
*root
,
5975 const char *name
, int name_len
,
5976 u64 ref_objectid
, u64 objectid
,
5977 umode_t mode
, u64
*index
)
5979 struct inode
*inode
;
5980 struct btrfs_inode_item
*inode_item
;
5981 struct btrfs_key
*location
;
5982 struct btrfs_path
*path
;
5983 struct btrfs_inode_ref
*ref
;
5984 struct btrfs_key key
[2];
5986 int nitems
= name
? 2 : 1;
5990 path
= btrfs_alloc_path();
5992 return ERR_PTR(-ENOMEM
);
5994 inode
= new_inode(root
->fs_info
->sb
);
5996 btrfs_free_path(path
);
5997 return ERR_PTR(-ENOMEM
);
6001 * O_TMPFILE, set link count to 0, so that after this point,
6002 * we fill in an inode item with the correct link count.
6005 set_nlink(inode
, 0);
6008 * we have to initialize this early, so we can reclaim the inode
6009 * number if we fail afterwards in this function.
6011 inode
->i_ino
= objectid
;
6014 trace_btrfs_inode_request(dir
);
6016 ret
= btrfs_set_inode_index(dir
, index
);
6018 btrfs_free_path(path
);
6020 return ERR_PTR(ret
);
6026 * index_cnt is ignored for everything but a dir,
6027 * btrfs_get_inode_index_count has an explanation for the magic
6030 BTRFS_I(inode
)->index_cnt
= 2;
6031 BTRFS_I(inode
)->dir_index
= *index
;
6032 BTRFS_I(inode
)->root
= root
;
6033 BTRFS_I(inode
)->generation
= trans
->transid
;
6034 inode
->i_generation
= BTRFS_I(inode
)->generation
;
6037 * We could have gotten an inode number from somebody who was fsynced
6038 * and then removed in this same transaction, so let's just set full
6039 * sync since it will be a full sync anyway and this will blow away the
6040 * old info in the log.
6042 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &BTRFS_I(inode
)->runtime_flags
);
6044 key
[0].objectid
= objectid
;
6045 key
[0].type
= BTRFS_INODE_ITEM_KEY
;
6048 sizes
[0] = sizeof(struct btrfs_inode_item
);
6052 * Start new inodes with an inode_ref. This is slightly more
6053 * efficient for small numbers of hard links since they will
6054 * be packed into one item. Extended refs will kick in if we
6055 * add more hard links than can fit in the ref item.
6057 key
[1].objectid
= objectid
;
6058 key
[1].type
= BTRFS_INODE_REF_KEY
;
6059 key
[1].offset
= ref_objectid
;
6061 sizes
[1] = name_len
+ sizeof(*ref
);
6064 location
= &BTRFS_I(inode
)->location
;
6065 location
->objectid
= objectid
;
6066 location
->offset
= 0;
6067 location
->type
= BTRFS_INODE_ITEM_KEY
;
6069 ret
= btrfs_insert_inode_locked(inode
);
6073 path
->leave_spinning
= 1;
6074 ret
= btrfs_insert_empty_items(trans
, root
, path
, key
, sizes
, nitems
);
6078 inode_init_owner(inode
, dir
, mode
);
6079 inode_set_bytes(inode
, 0);
6081 inode
->i_mtime
= CURRENT_TIME
;
6082 inode
->i_atime
= inode
->i_mtime
;
6083 inode
->i_ctime
= inode
->i_mtime
;
6084 BTRFS_I(inode
)->i_otime
= inode
->i_mtime
;
6086 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
6087 struct btrfs_inode_item
);
6088 memset_extent_buffer(path
->nodes
[0], 0, (unsigned long)inode_item
,
6089 sizeof(*inode_item
));
6090 fill_inode_item(trans
, path
->nodes
[0], inode_item
, inode
);
6093 ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0] + 1,
6094 struct btrfs_inode_ref
);
6095 btrfs_set_inode_ref_name_len(path
->nodes
[0], ref
, name_len
);
6096 btrfs_set_inode_ref_index(path
->nodes
[0], ref
, *index
);
6097 ptr
= (unsigned long)(ref
+ 1);
6098 write_extent_buffer(path
->nodes
[0], name
, ptr
, name_len
);
6101 btrfs_mark_buffer_dirty(path
->nodes
[0]);
6102 btrfs_free_path(path
);
6104 btrfs_inherit_iflags(inode
, dir
);
6106 if (S_ISREG(mode
)) {
6107 if (btrfs_test_opt(root
, NODATASUM
))
6108 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATASUM
;
6109 if (btrfs_test_opt(root
, NODATACOW
))
6110 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATACOW
|
6111 BTRFS_INODE_NODATASUM
;
6114 inode_tree_add(inode
);
6116 trace_btrfs_inode_new(inode
);
6117 btrfs_set_inode_last_trans(trans
, inode
);
6119 btrfs_update_root_times(trans
, root
);
6121 ret
= btrfs_inode_inherit_props(trans
, inode
, dir
);
6123 btrfs_err(root
->fs_info
,
6124 "error inheriting props for ino %llu (root %llu): %d",
6125 btrfs_ino(inode
), root
->root_key
.objectid
, ret
);
6130 unlock_new_inode(inode
);
6133 BTRFS_I(dir
)->index_cnt
--;
6134 btrfs_free_path(path
);
6136 return ERR_PTR(ret
);
6139 static inline u8
btrfs_inode_type(struct inode
*inode
)
6141 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
6145 * utility function to add 'inode' into 'parent_inode' with
6146 * a give name and a given sequence number.
6147 * if 'add_backref' is true, also insert a backref from the
6148 * inode to the parent directory.
6150 int btrfs_add_link(struct btrfs_trans_handle
*trans
,
6151 struct inode
*parent_inode
, struct inode
*inode
,
6152 const char *name
, int name_len
, int add_backref
, u64 index
)
6155 struct btrfs_key key
;
6156 struct btrfs_root
*root
= BTRFS_I(parent_inode
)->root
;
6157 u64 ino
= btrfs_ino(inode
);
6158 u64 parent_ino
= btrfs_ino(parent_inode
);
6160 if (unlikely(ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
6161 memcpy(&key
, &BTRFS_I(inode
)->root
->root_key
, sizeof(key
));
6164 key
.type
= BTRFS_INODE_ITEM_KEY
;
6168 if (unlikely(ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
6169 ret
= btrfs_add_root_ref(trans
, root
->fs_info
->tree_root
,
6170 key
.objectid
, root
->root_key
.objectid
,
6171 parent_ino
, index
, name
, name_len
);
6172 } else if (add_backref
) {
6173 ret
= btrfs_insert_inode_ref(trans
, root
, name
, name_len
, ino
,
6177 /* Nothing to clean up yet */
6181 ret
= btrfs_insert_dir_item(trans
, root
, name
, name_len
,
6183 btrfs_inode_type(inode
), index
);
6184 if (ret
== -EEXIST
|| ret
== -EOVERFLOW
)
6187 btrfs_abort_transaction(trans
, root
, ret
);
6191 btrfs_i_size_write(parent_inode
, parent_inode
->i_size
+
6193 inode_inc_iversion(parent_inode
);
6194 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
6195 ret
= btrfs_update_inode(trans
, root
, parent_inode
);
6197 btrfs_abort_transaction(trans
, root
, ret
);
6201 if (unlikely(ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
6204 err
= btrfs_del_root_ref(trans
, root
->fs_info
->tree_root
,
6205 key
.objectid
, root
->root_key
.objectid
,
6206 parent_ino
, &local_index
, name
, name_len
);
6208 } else if (add_backref
) {
6212 err
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
6213 ino
, parent_ino
, &local_index
);
6218 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
6219 struct inode
*dir
, struct dentry
*dentry
,
6220 struct inode
*inode
, int backref
, u64 index
)
6222 int err
= btrfs_add_link(trans
, dir
, inode
,
6223 dentry
->d_name
.name
, dentry
->d_name
.len
,
6230 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
6231 umode_t mode
, dev_t rdev
)
6233 struct btrfs_trans_handle
*trans
;
6234 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
6235 struct inode
*inode
= NULL
;
6241 if (!new_valid_dev(rdev
))
6245 * 2 for inode item and ref
6247 * 1 for xattr if selinux is on
6249 trans
= btrfs_start_transaction(root
, 5);
6251 return PTR_ERR(trans
);
6253 err
= btrfs_find_free_ino(root
, &objectid
);
6257 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
6258 dentry
->d_name
.len
, btrfs_ino(dir
), objectid
,
6260 if (IS_ERR(inode
)) {
6261 err
= PTR_ERR(inode
);
6266 * If the active LSM wants to access the inode during
6267 * d_instantiate it needs these. Smack checks to see
6268 * if the filesystem supports xattrs by looking at the
6271 inode
->i_op
= &btrfs_special_inode_operations
;
6272 init_special_inode(inode
, inode
->i_mode
, rdev
);
6274 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
6276 goto out_unlock_inode
;
6278 err
= btrfs_add_nondir(trans
, dir
, dentry
, inode
, 0, index
);
6280 goto out_unlock_inode
;
6282 btrfs_update_inode(trans
, root
, inode
);
6283 unlock_new_inode(inode
);
6284 d_instantiate(dentry
, inode
);
6288 btrfs_end_transaction(trans
, root
);
6289 btrfs_balance_delayed_items(root
);
6290 btrfs_btree_balance_dirty(root
);
6292 inode_dec_link_count(inode
);
6299 unlock_new_inode(inode
);
6304 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
6305 umode_t mode
, bool excl
)
6307 struct btrfs_trans_handle
*trans
;
6308 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
6309 struct inode
*inode
= NULL
;
6310 int drop_inode_on_err
= 0;
6316 * 2 for inode item and ref
6318 * 1 for xattr if selinux is on
6320 trans
= btrfs_start_transaction(root
, 5);
6322 return PTR_ERR(trans
);
6324 err
= btrfs_find_free_ino(root
, &objectid
);
6328 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
6329 dentry
->d_name
.len
, btrfs_ino(dir
), objectid
,
6331 if (IS_ERR(inode
)) {
6332 err
= PTR_ERR(inode
);
6335 drop_inode_on_err
= 1;
6337 * If the active LSM wants to access the inode during
6338 * d_instantiate it needs these. Smack checks to see
6339 * if the filesystem supports xattrs by looking at the
6342 inode
->i_fop
= &btrfs_file_operations
;
6343 inode
->i_op
= &btrfs_file_inode_operations
;
6344 inode
->i_mapping
->a_ops
= &btrfs_aops
;
6346 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
6348 goto out_unlock_inode
;
6350 err
= btrfs_update_inode(trans
, root
, inode
);
6352 goto out_unlock_inode
;
6354 err
= btrfs_add_nondir(trans
, dir
, dentry
, inode
, 0, index
);
6356 goto out_unlock_inode
;
6358 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
6359 unlock_new_inode(inode
);
6360 d_instantiate(dentry
, inode
);
6363 btrfs_end_transaction(trans
, root
);
6364 if (err
&& drop_inode_on_err
) {
6365 inode_dec_link_count(inode
);
6368 btrfs_balance_delayed_items(root
);
6369 btrfs_btree_balance_dirty(root
);
6373 unlock_new_inode(inode
);
6378 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
6379 struct dentry
*dentry
)
6381 struct btrfs_trans_handle
*trans
;
6382 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
6383 struct inode
*inode
= d_inode(old_dentry
);
6388 /* do not allow sys_link's with other subvols of the same device */
6389 if (root
->objectid
!= BTRFS_I(inode
)->root
->objectid
)
6392 if (inode
->i_nlink
>= BTRFS_LINK_MAX
)
6395 err
= btrfs_set_inode_index(dir
, &index
);
6400 * 2 items for inode and inode ref
6401 * 2 items for dir items
6402 * 1 item for parent inode
6404 trans
= btrfs_start_transaction(root
, 5);
6405 if (IS_ERR(trans
)) {
6406 err
= PTR_ERR(trans
);
6410 /* There are several dir indexes for this inode, clear the cache. */
6411 BTRFS_I(inode
)->dir_index
= 0ULL;
6413 inode_inc_iversion(inode
);
6414 inode
->i_ctime
= CURRENT_TIME
;
6416 set_bit(BTRFS_INODE_COPY_EVERYTHING
, &BTRFS_I(inode
)->runtime_flags
);
6418 err
= btrfs_add_nondir(trans
, dir
, dentry
, inode
, 1, index
);
6423 struct dentry
*parent
= dentry
->d_parent
;
6424 err
= btrfs_update_inode(trans
, root
, inode
);
6427 if (inode
->i_nlink
== 1) {
6429 * If new hard link count is 1, it's a file created
6430 * with open(2) O_TMPFILE flag.
6432 err
= btrfs_orphan_del(trans
, inode
);
6436 d_instantiate(dentry
, inode
);
6437 btrfs_log_new_name(trans
, inode
, NULL
, parent
);
6440 btrfs_end_transaction(trans
, root
);
6441 btrfs_balance_delayed_items(root
);
6444 inode_dec_link_count(inode
);
6447 btrfs_btree_balance_dirty(root
);
6451 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
6453 struct inode
*inode
= NULL
;
6454 struct btrfs_trans_handle
*trans
;
6455 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
6457 int drop_on_err
= 0;
6462 * 2 items for inode and ref
6463 * 2 items for dir items
6464 * 1 for xattr if selinux is on
6466 trans
= btrfs_start_transaction(root
, 5);
6468 return PTR_ERR(trans
);
6470 err
= btrfs_find_free_ino(root
, &objectid
);
6474 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
6475 dentry
->d_name
.len
, btrfs_ino(dir
), objectid
,
6476 S_IFDIR
| mode
, &index
);
6477 if (IS_ERR(inode
)) {
6478 err
= PTR_ERR(inode
);
6483 /* these must be set before we unlock the inode */
6484 inode
->i_op
= &btrfs_dir_inode_operations
;
6485 inode
->i_fop
= &btrfs_dir_file_operations
;
6487 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
6489 goto out_fail_inode
;
6491 btrfs_i_size_write(inode
, 0);
6492 err
= btrfs_update_inode(trans
, root
, inode
);
6494 goto out_fail_inode
;
6496 err
= btrfs_add_link(trans
, dir
, inode
, dentry
->d_name
.name
,
6497 dentry
->d_name
.len
, 0, index
);
6499 goto out_fail_inode
;
6501 d_instantiate(dentry
, inode
);
6503 * mkdir is special. We're unlocking after we call d_instantiate
6504 * to avoid a race with nfsd calling d_instantiate.
6506 unlock_new_inode(inode
);
6510 btrfs_end_transaction(trans
, root
);
6512 inode_dec_link_count(inode
);
6515 btrfs_balance_delayed_items(root
);
6516 btrfs_btree_balance_dirty(root
);
6520 unlock_new_inode(inode
);
6524 /* Find next extent map of a given extent map, caller needs to ensure locks */
6525 static struct extent_map
*next_extent_map(struct extent_map
*em
)
6527 struct rb_node
*next
;
6529 next
= rb_next(&em
->rb_node
);
6532 return container_of(next
, struct extent_map
, rb_node
);
6535 static struct extent_map
*prev_extent_map(struct extent_map
*em
)
6537 struct rb_node
*prev
;
6539 prev
= rb_prev(&em
->rb_node
);
6542 return container_of(prev
, struct extent_map
, rb_node
);
6545 /* helper for btfs_get_extent. Given an existing extent in the tree,
6546 * the existing extent is the nearest extent to map_start,
6547 * and an extent that you want to insert, deal with overlap and insert
6548 * the best fitted new extent into the tree.
6550 static int merge_extent_mapping(struct extent_map_tree
*em_tree
,
6551 struct extent_map
*existing
,
6552 struct extent_map
*em
,
6555 struct extent_map
*prev
;
6556 struct extent_map
*next
;
6561 BUG_ON(map_start
< em
->start
|| map_start
>= extent_map_end(em
));
6563 if (existing
->start
> map_start
) {
6565 prev
= prev_extent_map(next
);
6568 next
= next_extent_map(prev
);
6571 start
= prev
? extent_map_end(prev
) : em
->start
;
6572 start
= max_t(u64
, start
, em
->start
);
6573 end
= next
? next
->start
: extent_map_end(em
);
6574 end
= min_t(u64
, end
, extent_map_end(em
));
6575 start_diff
= start
- em
->start
;
6577 em
->len
= end
- start
;
6578 if (em
->block_start
< EXTENT_MAP_LAST_BYTE
&&
6579 !test_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
)) {
6580 em
->block_start
+= start_diff
;
6581 em
->block_len
-= start_diff
;
6583 return add_extent_mapping(em_tree
, em
, 0);
6586 static noinline
int uncompress_inline(struct btrfs_path
*path
,
6587 struct inode
*inode
, struct page
*page
,
6588 size_t pg_offset
, u64 extent_offset
,
6589 struct btrfs_file_extent_item
*item
)
6592 struct extent_buffer
*leaf
= path
->nodes
[0];
6595 unsigned long inline_size
;
6599 WARN_ON(pg_offset
!= 0);
6600 compress_type
= btrfs_file_extent_compression(leaf
, item
);
6601 max_size
= btrfs_file_extent_ram_bytes(leaf
, item
);
6602 inline_size
= btrfs_file_extent_inline_item_len(leaf
,
6603 btrfs_item_nr(path
->slots
[0]));
6604 tmp
= kmalloc(inline_size
, GFP_NOFS
);
6607 ptr
= btrfs_file_extent_inline_start(item
);
6609 read_extent_buffer(leaf
, tmp
, ptr
, inline_size
);
6611 max_size
= min_t(unsigned long, PAGE_CACHE_SIZE
, max_size
);
6612 ret
= btrfs_decompress(compress_type
, tmp
, page
,
6613 extent_offset
, inline_size
, max_size
);
6619 * a bit scary, this does extent mapping from logical file offset to the disk.
6620 * the ugly parts come from merging extents from the disk with the in-ram
6621 * representation. This gets more complex because of the data=ordered code,
6622 * where the in-ram extents might be locked pending data=ordered completion.
6624 * This also copies inline extents directly into the page.
6627 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
6628 size_t pg_offset
, u64 start
, u64 len
,
6633 u64 extent_start
= 0;
6635 u64 objectid
= btrfs_ino(inode
);
6637 struct btrfs_path
*path
= NULL
;
6638 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
6639 struct btrfs_file_extent_item
*item
;
6640 struct extent_buffer
*leaf
;
6641 struct btrfs_key found_key
;
6642 struct extent_map
*em
= NULL
;
6643 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
6644 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
6645 struct btrfs_trans_handle
*trans
= NULL
;
6646 const bool new_inline
= !page
|| create
;
6649 read_lock(&em_tree
->lock
);
6650 em
= lookup_extent_mapping(em_tree
, start
, len
);
6652 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
6653 read_unlock(&em_tree
->lock
);
6656 if (em
->start
> start
|| em
->start
+ em
->len
<= start
)
6657 free_extent_map(em
);
6658 else if (em
->block_start
== EXTENT_MAP_INLINE
&& page
)
6659 free_extent_map(em
);
6663 em
= alloc_extent_map();
6668 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
6669 em
->start
= EXTENT_MAP_HOLE
;
6670 em
->orig_start
= EXTENT_MAP_HOLE
;
6672 em
->block_len
= (u64
)-1;
6675 path
= btrfs_alloc_path();
6681 * Chances are we'll be called again, so go ahead and do
6687 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
6688 objectid
, start
, trans
!= NULL
);
6695 if (path
->slots
[0] == 0)
6700 leaf
= path
->nodes
[0];
6701 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
6702 struct btrfs_file_extent_item
);
6703 /* are we inside the extent that was found? */
6704 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
6705 found_type
= found_key
.type
;
6706 if (found_key
.objectid
!= objectid
||
6707 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
6709 * If we backup past the first extent we want to move forward
6710 * and see if there is an extent in front of us, otherwise we'll
6711 * say there is a hole for our whole search range which can
6718 found_type
= btrfs_file_extent_type(leaf
, item
);
6719 extent_start
= found_key
.offset
;
6720 if (found_type
== BTRFS_FILE_EXTENT_REG
||
6721 found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
6722 extent_end
= extent_start
+
6723 btrfs_file_extent_num_bytes(leaf
, item
);
6724 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
6726 size
= btrfs_file_extent_inline_len(leaf
, path
->slots
[0], item
);
6727 extent_end
= ALIGN(extent_start
+ size
, root
->sectorsize
);
6730 if (start
>= extent_end
) {
6732 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
6733 ret
= btrfs_next_leaf(root
, path
);
6740 leaf
= path
->nodes
[0];
6742 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
6743 if (found_key
.objectid
!= objectid
||
6744 found_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
6746 if (start
+ len
<= found_key
.offset
)
6748 if (start
> found_key
.offset
)
6751 em
->orig_start
= start
;
6752 em
->len
= found_key
.offset
- start
;
6756 btrfs_extent_item_to_extent_map(inode
, path
, item
, new_inline
, em
);
6758 if (found_type
== BTRFS_FILE_EXTENT_REG
||
6759 found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
6761 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
6765 size_t extent_offset
;
6771 size
= btrfs_file_extent_inline_len(leaf
, path
->slots
[0], item
);
6772 extent_offset
= page_offset(page
) + pg_offset
- extent_start
;
6773 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- pg_offset
,
6774 size
- extent_offset
);
6775 em
->start
= extent_start
+ extent_offset
;
6776 em
->len
= ALIGN(copy_size
, root
->sectorsize
);
6777 em
->orig_block_len
= em
->len
;
6778 em
->orig_start
= em
->start
;
6779 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
6780 if (create
== 0 && !PageUptodate(page
)) {
6781 if (btrfs_file_extent_compression(leaf
, item
) !=
6782 BTRFS_COMPRESS_NONE
) {
6783 ret
= uncompress_inline(path
, inode
, page
,
6785 extent_offset
, item
);
6792 read_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
6794 if (pg_offset
+ copy_size
< PAGE_CACHE_SIZE
) {
6795 memset(map
+ pg_offset
+ copy_size
, 0,
6796 PAGE_CACHE_SIZE
- pg_offset
-
6801 flush_dcache_page(page
);
6802 } else if (create
&& PageUptodate(page
)) {
6806 free_extent_map(em
);
6809 btrfs_release_path(path
);
6810 trans
= btrfs_join_transaction(root
);
6813 return ERR_CAST(trans
);
6817 write_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
6820 btrfs_mark_buffer_dirty(leaf
);
6822 set_extent_uptodate(io_tree
, em
->start
,
6823 extent_map_end(em
) - 1, NULL
, GFP_NOFS
);
6828 em
->orig_start
= start
;
6831 em
->block_start
= EXTENT_MAP_HOLE
;
6832 set_bit(EXTENT_FLAG_VACANCY
, &em
->flags
);
6834 btrfs_release_path(path
);
6835 if (em
->start
> start
|| extent_map_end(em
) <= start
) {
6836 btrfs_err(root
->fs_info
, "bad extent! em: [%llu %llu] passed [%llu %llu]",
6837 em
->start
, em
->len
, start
, len
);
6843 write_lock(&em_tree
->lock
);
6844 ret
= add_extent_mapping(em_tree
, em
, 0);
6845 /* it is possible that someone inserted the extent into the tree
6846 * while we had the lock dropped. It is also possible that
6847 * an overlapping map exists in the tree
6849 if (ret
== -EEXIST
) {
6850 struct extent_map
*existing
;
6854 existing
= search_extent_mapping(em_tree
, start
, len
);
6856 * existing will always be non-NULL, since there must be
6857 * extent causing the -EEXIST.
6859 if (start
>= extent_map_end(existing
) ||
6860 start
<= existing
->start
) {
6862 * The existing extent map is the one nearest to
6863 * the [start, start + len) range which overlaps
6865 err
= merge_extent_mapping(em_tree
, existing
,
6867 free_extent_map(existing
);
6869 free_extent_map(em
);
6873 free_extent_map(em
);
6878 write_unlock(&em_tree
->lock
);
6881 trace_btrfs_get_extent(root
, em
);
6884 btrfs_free_path(path
);
6886 ret
= btrfs_end_transaction(trans
, root
);
6891 free_extent_map(em
);
6892 return ERR_PTR(err
);
6894 BUG_ON(!em
); /* Error is always set */
6898 struct extent_map
*btrfs_get_extent_fiemap(struct inode
*inode
, struct page
*page
,
6899 size_t pg_offset
, u64 start
, u64 len
,
6902 struct extent_map
*em
;
6903 struct extent_map
*hole_em
= NULL
;
6904 u64 range_start
= start
;
6910 em
= btrfs_get_extent(inode
, page
, pg_offset
, start
, len
, create
);
6917 * - a pre-alloc extent,
6918 * there might actually be delalloc bytes behind it.
6920 if (em
->block_start
!= EXTENT_MAP_HOLE
&&
6921 !test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
6927 /* check to see if we've wrapped (len == -1 or similar) */
6936 /* ok, we didn't find anything, lets look for delalloc */
6937 found
= count_range_bits(&BTRFS_I(inode
)->io_tree
, &range_start
,
6938 end
, len
, EXTENT_DELALLOC
, 1);
6939 found_end
= range_start
+ found
;
6940 if (found_end
< range_start
)
6941 found_end
= (u64
)-1;
6944 * we didn't find anything useful, return
6945 * the original results from get_extent()
6947 if (range_start
> end
|| found_end
<= start
) {
6953 /* adjust the range_start to make sure it doesn't
6954 * go backwards from the start they passed in
6956 range_start
= max(start
, range_start
);
6957 found
= found_end
- range_start
;
6960 u64 hole_start
= start
;
6963 em
= alloc_extent_map();
6969 * when btrfs_get_extent can't find anything it
6970 * returns one huge hole
6972 * make sure what it found really fits our range, and
6973 * adjust to make sure it is based on the start from
6977 u64 calc_end
= extent_map_end(hole_em
);
6979 if (calc_end
<= start
|| (hole_em
->start
> end
)) {
6980 free_extent_map(hole_em
);
6983 hole_start
= max(hole_em
->start
, start
);
6984 hole_len
= calc_end
- hole_start
;
6988 if (hole_em
&& range_start
> hole_start
) {
6989 /* our hole starts before our delalloc, so we
6990 * have to return just the parts of the hole
6991 * that go until the delalloc starts
6993 em
->len
= min(hole_len
,
6994 range_start
- hole_start
);
6995 em
->start
= hole_start
;
6996 em
->orig_start
= hole_start
;
6998 * don't adjust block start at all,
6999 * it is fixed at EXTENT_MAP_HOLE
7001 em
->block_start
= hole_em
->block_start
;
7002 em
->block_len
= hole_len
;
7003 if (test_bit(EXTENT_FLAG_PREALLOC
, &hole_em
->flags
))
7004 set_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
);
7006 em
->start
= range_start
;
7008 em
->orig_start
= range_start
;
7009 em
->block_start
= EXTENT_MAP_DELALLOC
;
7010 em
->block_len
= found
;
7012 } else if (hole_em
) {
7017 free_extent_map(hole_em
);
7019 free_extent_map(em
);
7020 return ERR_PTR(err
);
7025 static struct extent_map
*btrfs_new_extent_direct(struct inode
*inode
,
7028 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7029 struct extent_map
*em
;
7030 struct btrfs_key ins
;
7034 alloc_hint
= get_extent_allocation_hint(inode
, start
, len
);
7035 ret
= btrfs_reserve_extent(root
, len
, root
->sectorsize
, 0,
7036 alloc_hint
, &ins
, 1, 1);
7038 return ERR_PTR(ret
);
7040 em
= create_pinned_em(inode
, start
, ins
.offset
, start
, ins
.objectid
,
7041 ins
.offset
, ins
.offset
, ins
.offset
, 0);
7043 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
, 1);
7047 ret
= btrfs_add_ordered_extent_dio(inode
, start
, ins
.objectid
,
7048 ins
.offset
, ins
.offset
, 0);
7050 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
, 1);
7051 free_extent_map(em
);
7052 return ERR_PTR(ret
);
7059 * returns 1 when the nocow is safe, < 1 on error, 0 if the
7060 * block must be cow'd
7062 noinline
int can_nocow_extent(struct inode
*inode
, u64 offset
, u64
*len
,
7063 u64
*orig_start
, u64
*orig_block_len
,
7066 struct btrfs_trans_handle
*trans
;
7067 struct btrfs_path
*path
;
7069 struct extent_buffer
*leaf
;
7070 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7071 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
7072 struct btrfs_file_extent_item
*fi
;
7073 struct btrfs_key key
;
7080 bool nocow
= (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
);
7082 path
= btrfs_alloc_path();
7086 ret
= btrfs_lookup_file_extent(NULL
, root
, path
, btrfs_ino(inode
),
7091 slot
= path
->slots
[0];
7094 /* can't find the item, must cow */
7101 leaf
= path
->nodes
[0];
7102 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
7103 if (key
.objectid
!= btrfs_ino(inode
) ||
7104 key
.type
!= BTRFS_EXTENT_DATA_KEY
) {
7105 /* not our file or wrong item type, must cow */
7109 if (key
.offset
> offset
) {
7110 /* Wrong offset, must cow */
7114 fi
= btrfs_item_ptr(leaf
, slot
, struct btrfs_file_extent_item
);
7115 found_type
= btrfs_file_extent_type(leaf
, fi
);
7116 if (found_type
!= BTRFS_FILE_EXTENT_REG
&&
7117 found_type
!= BTRFS_FILE_EXTENT_PREALLOC
) {
7118 /* not a regular extent, must cow */
7122 if (!nocow
&& found_type
== BTRFS_FILE_EXTENT_REG
)
7125 extent_end
= key
.offset
+ btrfs_file_extent_num_bytes(leaf
, fi
);
7126 if (extent_end
<= offset
)
7129 disk_bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
7130 if (disk_bytenr
== 0)
7133 if (btrfs_file_extent_compression(leaf
, fi
) ||
7134 btrfs_file_extent_encryption(leaf
, fi
) ||
7135 btrfs_file_extent_other_encoding(leaf
, fi
))
7138 backref_offset
= btrfs_file_extent_offset(leaf
, fi
);
7141 *orig_start
= key
.offset
- backref_offset
;
7142 *orig_block_len
= btrfs_file_extent_disk_num_bytes(leaf
, fi
);
7143 *ram_bytes
= btrfs_file_extent_ram_bytes(leaf
, fi
);
7146 if (btrfs_extent_readonly(root
, disk_bytenr
))
7149 num_bytes
= min(offset
+ *len
, extent_end
) - offset
;
7150 if (!nocow
&& found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
7153 range_end
= round_up(offset
+ num_bytes
, root
->sectorsize
) - 1;
7154 ret
= test_range_bit(io_tree
, offset
, range_end
,
7155 EXTENT_DELALLOC
, 0, NULL
);
7162 btrfs_release_path(path
);
7165 * look for other files referencing this extent, if we
7166 * find any we must cow
7168 trans
= btrfs_join_transaction(root
);
7169 if (IS_ERR(trans
)) {
7174 ret
= btrfs_cross_ref_exist(trans
, root
, btrfs_ino(inode
),
7175 key
.offset
- backref_offset
, disk_bytenr
);
7176 btrfs_end_transaction(trans
, root
);
7183 * adjust disk_bytenr and num_bytes to cover just the bytes
7184 * in this extent we are about to write. If there
7185 * are any csums in that range we have to cow in order
7186 * to keep the csums correct
7188 disk_bytenr
+= backref_offset
;
7189 disk_bytenr
+= offset
- key
.offset
;
7190 if (csum_exist_in_range(root
, disk_bytenr
, num_bytes
))
7193 * all of the above have passed, it is safe to overwrite this extent
7199 btrfs_free_path(path
);
7203 bool btrfs_page_exists_in_range(struct inode
*inode
, loff_t start
, loff_t end
)
7205 struct radix_tree_root
*root
= &inode
->i_mapping
->page_tree
;
7207 void **pagep
= NULL
;
7208 struct page
*page
= NULL
;
7212 start_idx
= start
>> PAGE_CACHE_SHIFT
;
7215 * end is the last byte in the last page. end == start is legal
7217 end_idx
= end
>> PAGE_CACHE_SHIFT
;
7221 /* Most of the code in this while loop is lifted from
7222 * find_get_page. It's been modified to begin searching from a
7223 * page and return just the first page found in that range. If the
7224 * found idx is less than or equal to the end idx then we know that
7225 * a page exists. If no pages are found or if those pages are
7226 * outside of the range then we're fine (yay!) */
7227 while (page
== NULL
&&
7228 radix_tree_gang_lookup_slot(root
, &pagep
, NULL
, start_idx
, 1)) {
7229 page
= radix_tree_deref_slot(pagep
);
7230 if (unlikely(!page
))
7233 if (radix_tree_exception(page
)) {
7234 if (radix_tree_deref_retry(page
)) {
7239 * Otherwise, shmem/tmpfs must be storing a swap entry
7240 * here as an exceptional entry: so return it without
7241 * attempting to raise page count.
7244 break; /* TODO: Is this relevant for this use case? */
7247 if (!page_cache_get_speculative(page
)) {
7253 * Has the page moved?
7254 * This is part of the lockless pagecache protocol. See
7255 * include/linux/pagemap.h for details.
7257 if (unlikely(page
!= *pagep
)) {
7258 page_cache_release(page
);
7264 if (page
->index
<= end_idx
)
7266 page_cache_release(page
);
7273 static int lock_extent_direct(struct inode
*inode
, u64 lockstart
, u64 lockend
,
7274 struct extent_state
**cached_state
, int writing
)
7276 struct btrfs_ordered_extent
*ordered
;
7280 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, lockstart
, lockend
,
7283 * We're concerned with the entire range that we're going to be
7284 * doing DIO to, so we need to make sure theres no ordered
7285 * extents in this range.
7287 ordered
= btrfs_lookup_ordered_range(inode
, lockstart
,
7288 lockend
- lockstart
+ 1);
7291 * We need to make sure there are no buffered pages in this
7292 * range either, we could have raced between the invalidate in
7293 * generic_file_direct_write and locking the extent. The
7294 * invalidate needs to happen so that reads after a write do not
7299 !btrfs_page_exists_in_range(inode
, lockstart
, lockend
)))
7302 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, lockstart
, lockend
,
7303 cached_state
, GFP_NOFS
);
7306 btrfs_start_ordered_extent(inode
, ordered
, 1);
7307 btrfs_put_ordered_extent(ordered
);
7309 /* Screw you mmap */
7310 ret
= btrfs_fdatawrite_range(inode
, lockstart
, lockend
);
7313 ret
= filemap_fdatawait_range(inode
->i_mapping
,
7320 * If we found a page that couldn't be invalidated just
7321 * fall back to buffered.
7323 ret
= invalidate_inode_pages2_range(inode
->i_mapping
,
7324 lockstart
>> PAGE_CACHE_SHIFT
,
7325 lockend
>> PAGE_CACHE_SHIFT
);
7336 static struct extent_map
*create_pinned_em(struct inode
*inode
, u64 start
,
7337 u64 len
, u64 orig_start
,
7338 u64 block_start
, u64 block_len
,
7339 u64 orig_block_len
, u64 ram_bytes
,
7342 struct extent_map_tree
*em_tree
;
7343 struct extent_map
*em
;
7344 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7347 em_tree
= &BTRFS_I(inode
)->extent_tree
;
7348 em
= alloc_extent_map();
7350 return ERR_PTR(-ENOMEM
);
7353 em
->orig_start
= orig_start
;
7354 em
->mod_start
= start
;
7357 em
->block_len
= block_len
;
7358 em
->block_start
= block_start
;
7359 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
7360 em
->orig_block_len
= orig_block_len
;
7361 em
->ram_bytes
= ram_bytes
;
7362 em
->generation
= -1;
7363 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
7364 if (type
== BTRFS_ORDERED_PREALLOC
)
7365 set_bit(EXTENT_FLAG_FILLING
, &em
->flags
);
7368 btrfs_drop_extent_cache(inode
, em
->start
,
7369 em
->start
+ em
->len
- 1, 0);
7370 write_lock(&em_tree
->lock
);
7371 ret
= add_extent_mapping(em_tree
, em
, 1);
7372 write_unlock(&em_tree
->lock
);
7373 } while (ret
== -EEXIST
);
7376 free_extent_map(em
);
7377 return ERR_PTR(ret
);
7384 static int btrfs_get_blocks_direct(struct inode
*inode
, sector_t iblock
,
7385 struct buffer_head
*bh_result
, int create
)
7387 struct extent_map
*em
;
7388 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7389 struct extent_state
*cached_state
= NULL
;
7390 u64 start
= iblock
<< inode
->i_blkbits
;
7391 u64 lockstart
, lockend
;
7392 u64 len
= bh_result
->b_size
;
7393 u64
*outstanding_extents
= NULL
;
7394 int unlock_bits
= EXTENT_LOCKED
;
7398 unlock_bits
|= EXTENT_DIRTY
;
7400 len
= min_t(u64
, len
, root
->sectorsize
);
7403 lockend
= start
+ len
- 1;
7405 if (current
->journal_info
) {
7407 * Need to pull our outstanding extents and set journal_info to NULL so
7408 * that anything that needs to check if there's a transction doesn't get
7411 outstanding_extents
= current
->journal_info
;
7412 current
->journal_info
= NULL
;
7416 * If this errors out it's because we couldn't invalidate pagecache for
7417 * this range and we need to fallback to buffered.
7419 if (lock_extent_direct(inode
, lockstart
, lockend
, &cached_state
, create
))
7422 em
= btrfs_get_extent(inode
, NULL
, 0, start
, len
, 0);
7429 * Ok for INLINE and COMPRESSED extents we need to fallback on buffered
7430 * io. INLINE is special, and we could probably kludge it in here, but
7431 * it's still buffered so for safety lets just fall back to the generic
7434 * For COMPRESSED we _have_ to read the entire extent in so we can
7435 * decompress it, so there will be buffering required no matter what we
7436 * do, so go ahead and fallback to buffered.
7438 * We return -ENOTBLK because thats what makes DIO go ahead and go back
7439 * to buffered IO. Don't blame me, this is the price we pay for using
7442 if (test_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
) ||
7443 em
->block_start
== EXTENT_MAP_INLINE
) {
7444 free_extent_map(em
);
7449 /* Just a good old fashioned hole, return */
7450 if (!create
&& (em
->block_start
== EXTENT_MAP_HOLE
||
7451 test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))) {
7452 free_extent_map(em
);
7457 * We don't allocate a new extent in the following cases
7459 * 1) The inode is marked as NODATACOW. In this case we'll just use the
7461 * 2) The extent is marked as PREALLOC. We're good to go here and can
7462 * just use the extent.
7466 len
= min(len
, em
->len
- (start
- em
->start
));
7467 lockstart
= start
+ len
;
7471 if (test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
) ||
7472 ((BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
) &&
7473 em
->block_start
!= EXTENT_MAP_HOLE
)) {
7475 u64 block_start
, orig_start
, orig_block_len
, ram_bytes
;
7477 if (test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
7478 type
= BTRFS_ORDERED_PREALLOC
;
7480 type
= BTRFS_ORDERED_NOCOW
;
7481 len
= min(len
, em
->len
- (start
- em
->start
));
7482 block_start
= em
->block_start
+ (start
- em
->start
);
7484 if (can_nocow_extent(inode
, start
, &len
, &orig_start
,
7485 &orig_block_len
, &ram_bytes
) == 1) {
7486 if (type
== BTRFS_ORDERED_PREALLOC
) {
7487 free_extent_map(em
);
7488 em
= create_pinned_em(inode
, start
, len
,
7499 ret
= btrfs_add_ordered_extent_dio(inode
, start
,
7500 block_start
, len
, len
, type
);
7502 free_extent_map(em
);
7510 * this will cow the extent, reset the len in case we changed
7513 len
= bh_result
->b_size
;
7514 free_extent_map(em
);
7515 em
= btrfs_new_extent_direct(inode
, start
, len
);
7520 len
= min(len
, em
->len
- (start
- em
->start
));
7522 bh_result
->b_blocknr
= (em
->block_start
+ (start
- em
->start
)) >>
7524 bh_result
->b_size
= len
;
7525 bh_result
->b_bdev
= em
->bdev
;
7526 set_buffer_mapped(bh_result
);
7528 if (!test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
7529 set_buffer_new(bh_result
);
7532 * Need to update the i_size under the extent lock so buffered
7533 * readers will get the updated i_size when we unlock.
7535 if (start
+ len
> i_size_read(inode
))
7536 i_size_write(inode
, start
+ len
);
7539 * If we have an outstanding_extents count still set then we're
7540 * within our reservation, otherwise we need to adjust our inode
7541 * counter appropriately.
7543 if (*outstanding_extents
) {
7544 (*outstanding_extents
)--;
7546 spin_lock(&BTRFS_I(inode
)->lock
);
7547 BTRFS_I(inode
)->outstanding_extents
++;
7548 spin_unlock(&BTRFS_I(inode
)->lock
);
7551 current
->journal_info
= outstanding_extents
;
7552 btrfs_free_reserved_data_space(inode
, len
);
7553 set_bit(BTRFS_INODE_DIO_READY
, &BTRFS_I(inode
)->runtime_flags
);
7557 * In the case of write we need to clear and unlock the entire range,
7558 * in the case of read we need to unlock only the end area that we
7559 * aren't using if there is any left over space.
7561 if (lockstart
< lockend
) {
7562 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, lockstart
,
7563 lockend
, unlock_bits
, 1, 0,
7564 &cached_state
, GFP_NOFS
);
7566 free_extent_state(cached_state
);
7569 free_extent_map(em
);
7574 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, lockstart
, lockend
,
7575 unlock_bits
, 1, 0, &cached_state
, GFP_NOFS
);
7576 if (outstanding_extents
)
7577 current
->journal_info
= outstanding_extents
;
7581 static inline int submit_dio_repair_bio(struct inode
*inode
, struct bio
*bio
,
7582 int rw
, int mirror_num
)
7584 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7587 BUG_ON(rw
& REQ_WRITE
);
7591 ret
= btrfs_bio_wq_end_io(root
->fs_info
, bio
,
7592 BTRFS_WQ_ENDIO_DIO_REPAIR
);
7596 ret
= btrfs_map_bio(root
, rw
, bio
, mirror_num
, 0);
7602 static int btrfs_check_dio_repairable(struct inode
*inode
,
7603 struct bio
*failed_bio
,
7604 struct io_failure_record
*failrec
,
7609 num_copies
= btrfs_num_copies(BTRFS_I(inode
)->root
->fs_info
,
7610 failrec
->logical
, failrec
->len
);
7611 if (num_copies
== 1) {
7613 * we only have a single copy of the data, so don't bother with
7614 * all the retry and error correction code that follows. no
7615 * matter what the error is, it is very likely to persist.
7617 pr_debug("Check DIO Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d\n",
7618 num_copies
, failrec
->this_mirror
, failed_mirror
);
7622 failrec
->failed_mirror
= failed_mirror
;
7623 failrec
->this_mirror
++;
7624 if (failrec
->this_mirror
== failed_mirror
)
7625 failrec
->this_mirror
++;
7627 if (failrec
->this_mirror
> num_copies
) {
7628 pr_debug("Check DIO Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d\n",
7629 num_copies
, failrec
->this_mirror
, failed_mirror
);
7636 static int dio_read_error(struct inode
*inode
, struct bio
*failed_bio
,
7637 struct page
*page
, u64 start
, u64 end
,
7638 int failed_mirror
, bio_end_io_t
*repair_endio
,
7641 struct io_failure_record
*failrec
;
7647 BUG_ON(failed_bio
->bi_rw
& REQ_WRITE
);
7649 ret
= btrfs_get_io_failure_record(inode
, start
, end
, &failrec
);
7653 ret
= btrfs_check_dio_repairable(inode
, failed_bio
, failrec
,
7656 free_io_failure(inode
, failrec
);
7660 if (failed_bio
->bi_vcnt
> 1)
7661 read_mode
= READ_SYNC
| REQ_FAILFAST_DEV
;
7663 read_mode
= READ_SYNC
;
7665 isector
= start
- btrfs_io_bio(failed_bio
)->logical
;
7666 isector
>>= inode
->i_sb
->s_blocksize_bits
;
7667 bio
= btrfs_create_repair_bio(inode
, failed_bio
, failrec
, page
,
7668 0, isector
, repair_endio
, repair_arg
);
7670 free_io_failure(inode
, failrec
);
7674 btrfs_debug(BTRFS_I(inode
)->root
->fs_info
,
7675 "Repair DIO Read Error: submitting new dio read[%#x] to this_mirror=%d, in_validation=%d\n",
7676 read_mode
, failrec
->this_mirror
, failrec
->in_validation
);
7678 ret
= submit_dio_repair_bio(inode
, bio
, read_mode
,
7679 failrec
->this_mirror
);
7681 free_io_failure(inode
, failrec
);
7688 struct btrfs_retry_complete
{
7689 struct completion done
;
7690 struct inode
*inode
;
7695 static void btrfs_retry_endio_nocsum(struct bio
*bio
)
7697 struct btrfs_retry_complete
*done
= bio
->bi_private
;
7698 struct bio_vec
*bvec
;
7705 bio_for_each_segment_all(bvec
, bio
, i
)
7706 clean_io_failure(done
->inode
, done
->start
, bvec
->bv_page
, 0);
7708 complete(&done
->done
);
7712 static int __btrfs_correct_data_nocsum(struct inode
*inode
,
7713 struct btrfs_io_bio
*io_bio
)
7715 struct bio_vec
*bvec
;
7716 struct btrfs_retry_complete done
;
7721 start
= io_bio
->logical
;
7724 bio_for_each_segment_all(bvec
, &io_bio
->bio
, i
) {
7728 init_completion(&done
.done
);
7730 ret
= dio_read_error(inode
, &io_bio
->bio
, bvec
->bv_page
, start
,
7731 start
+ bvec
->bv_len
- 1,
7733 btrfs_retry_endio_nocsum
, &done
);
7737 wait_for_completion(&done
.done
);
7739 if (!done
.uptodate
) {
7740 /* We might have another mirror, so try again */
7744 start
+= bvec
->bv_len
;
7750 static void btrfs_retry_endio(struct bio
*bio
)
7752 struct btrfs_retry_complete
*done
= bio
->bi_private
;
7753 struct btrfs_io_bio
*io_bio
= btrfs_io_bio(bio
);
7754 struct bio_vec
*bvec
;
7763 bio_for_each_segment_all(bvec
, bio
, i
) {
7764 ret
= __readpage_endio_check(done
->inode
, io_bio
, i
,
7766 done
->start
, bvec
->bv_len
);
7768 clean_io_failure(done
->inode
, done
->start
,
7774 done
->uptodate
= uptodate
;
7776 complete(&done
->done
);
7780 static int __btrfs_subio_endio_read(struct inode
*inode
,
7781 struct btrfs_io_bio
*io_bio
, int err
)
7783 struct bio_vec
*bvec
;
7784 struct btrfs_retry_complete done
;
7791 start
= io_bio
->logical
;
7794 bio_for_each_segment_all(bvec
, &io_bio
->bio
, i
) {
7795 ret
= __readpage_endio_check(inode
, io_bio
, i
, bvec
->bv_page
,
7796 0, start
, bvec
->bv_len
);
7802 init_completion(&done
.done
);
7804 ret
= dio_read_error(inode
, &io_bio
->bio
, bvec
->bv_page
, start
,
7805 start
+ bvec
->bv_len
- 1,
7807 btrfs_retry_endio
, &done
);
7813 wait_for_completion(&done
.done
);
7815 if (!done
.uptodate
) {
7816 /* We might have another mirror, so try again */
7820 offset
+= bvec
->bv_len
;
7821 start
+= bvec
->bv_len
;
7827 static int btrfs_subio_endio_read(struct inode
*inode
,
7828 struct btrfs_io_bio
*io_bio
, int err
)
7830 bool skip_csum
= BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
;
7834 return __btrfs_correct_data_nocsum(inode
, io_bio
);
7838 return __btrfs_subio_endio_read(inode
, io_bio
, err
);
7842 static void btrfs_endio_direct_read(struct bio
*bio
)
7844 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7845 struct inode
*inode
= dip
->inode
;
7846 struct bio
*dio_bio
;
7847 struct btrfs_io_bio
*io_bio
= btrfs_io_bio(bio
);
7848 int err
= bio
->bi_error
;
7850 if (dip
->flags
& BTRFS_DIO_ORIG_BIO_SUBMITTED
)
7851 err
= btrfs_subio_endio_read(inode
, io_bio
, err
);
7853 unlock_extent(&BTRFS_I(inode
)->io_tree
, dip
->logical_offset
,
7854 dip
->logical_offset
+ dip
->bytes
- 1);
7855 dio_bio
= dip
->dio_bio
;
7859 dio_end_io(dio_bio
, bio
->bi_error
);
7862 io_bio
->end_io(io_bio
, err
);
7866 static void btrfs_endio_direct_write(struct bio
*bio
)
7868 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7869 struct inode
*inode
= dip
->inode
;
7870 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7871 struct btrfs_ordered_extent
*ordered
= NULL
;
7872 u64 ordered_offset
= dip
->logical_offset
;
7873 u64 ordered_bytes
= dip
->bytes
;
7874 struct bio
*dio_bio
;
7878 ret
= btrfs_dec_test_first_ordered_pending(inode
, &ordered
,
7885 btrfs_init_work(&ordered
->work
, btrfs_endio_write_helper
,
7886 finish_ordered_fn
, NULL
, NULL
);
7887 btrfs_queue_work(root
->fs_info
->endio_write_workers
,
7891 * our bio might span multiple ordered extents. If we haven't
7892 * completed the accounting for the whole dio, go back and try again
7894 if (ordered_offset
< dip
->logical_offset
+ dip
->bytes
) {
7895 ordered_bytes
= dip
->logical_offset
+ dip
->bytes
-
7900 dio_bio
= dip
->dio_bio
;
7904 dio_end_io(dio_bio
, bio
->bi_error
);
7908 static int __btrfs_submit_bio_start_direct_io(struct inode
*inode
, int rw
,
7909 struct bio
*bio
, int mirror_num
,
7910 unsigned long bio_flags
, u64 offset
)
7913 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7914 ret
= btrfs_csum_one_bio(root
, inode
, bio
, offset
, 1);
7915 BUG_ON(ret
); /* -ENOMEM */
7919 static void btrfs_end_dio_bio(struct bio
*bio
)
7921 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7922 int err
= bio
->bi_error
;
7925 btrfs_warn(BTRFS_I(dip
->inode
)->root
->fs_info
,
7926 "direct IO failed ino %llu rw %lu sector %#Lx len %u err no %d",
7927 btrfs_ino(dip
->inode
), bio
->bi_rw
,
7928 (unsigned long long)bio
->bi_iter
.bi_sector
,
7929 bio
->bi_iter
.bi_size
, err
);
7931 if (dip
->subio_endio
)
7932 err
= dip
->subio_endio(dip
->inode
, btrfs_io_bio(bio
), err
);
7938 * before atomic variable goto zero, we must make sure
7939 * dip->errors is perceived to be set.
7941 smp_mb__before_atomic();
7944 /* if there are more bios still pending for this dio, just exit */
7945 if (!atomic_dec_and_test(&dip
->pending_bios
))
7949 bio_io_error(dip
->orig_bio
);
7951 dip
->dio_bio
->bi_error
= 0;
7952 bio_endio(dip
->orig_bio
);
7958 static struct bio
*btrfs_dio_bio_alloc(struct block_device
*bdev
,
7959 u64 first_sector
, gfp_t gfp_flags
)
7961 return btrfs_bio_alloc(bdev
, first_sector
, BIO_MAX_PAGES
, gfp_flags
);
7964 static inline int btrfs_lookup_and_bind_dio_csum(struct btrfs_root
*root
,
7965 struct inode
*inode
,
7966 struct btrfs_dio_private
*dip
,
7970 struct btrfs_io_bio
*io_bio
= btrfs_io_bio(bio
);
7971 struct btrfs_io_bio
*orig_io_bio
= btrfs_io_bio(dip
->orig_bio
);
7975 * We load all the csum data we need when we submit
7976 * the first bio to reduce the csum tree search and
7979 if (dip
->logical_offset
== file_offset
) {
7980 ret
= btrfs_lookup_bio_sums_dio(root
, inode
, dip
->orig_bio
,
7986 if (bio
== dip
->orig_bio
)
7989 file_offset
-= dip
->logical_offset
;
7990 file_offset
>>= inode
->i_sb
->s_blocksize_bits
;
7991 io_bio
->csum
= (u8
*)(((u32
*)orig_io_bio
->csum
) + file_offset
);
7996 static inline int __btrfs_submit_dio_bio(struct bio
*bio
, struct inode
*inode
,
7997 int rw
, u64 file_offset
, int skip_sum
,
8000 struct btrfs_dio_private
*dip
= bio
->bi_private
;
8001 int write
= rw
& REQ_WRITE
;
8002 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8006 async_submit
= !atomic_read(&BTRFS_I(inode
)->sync_writers
);
8011 ret
= btrfs_bio_wq_end_io(root
->fs_info
, bio
,
8012 BTRFS_WQ_ENDIO_DATA
);
8020 if (write
&& async_submit
) {
8021 ret
= btrfs_wq_submit_bio(root
->fs_info
,
8022 inode
, rw
, bio
, 0, 0,
8024 __btrfs_submit_bio_start_direct_io
,
8025 __btrfs_submit_bio_done
);
8029 * If we aren't doing async submit, calculate the csum of the
8032 ret
= btrfs_csum_one_bio(root
, inode
, bio
, file_offset
, 1);
8036 ret
= btrfs_lookup_and_bind_dio_csum(root
, inode
, dip
, bio
,
8042 ret
= btrfs_map_bio(root
, rw
, bio
, 0, async_submit
);
8048 static int btrfs_submit_direct_hook(int rw
, struct btrfs_dio_private
*dip
,
8051 struct inode
*inode
= dip
->inode
;
8052 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8054 struct bio
*orig_bio
= dip
->orig_bio
;
8055 struct bio_vec
*bvec
= orig_bio
->bi_io_vec
;
8056 u64 start_sector
= orig_bio
->bi_iter
.bi_sector
;
8057 u64 file_offset
= dip
->logical_offset
;
8062 int async_submit
= 0;
8064 map_length
= orig_bio
->bi_iter
.bi_size
;
8065 ret
= btrfs_map_block(root
->fs_info
, rw
, start_sector
<< 9,
8066 &map_length
, NULL
, 0);
8070 if (map_length
>= orig_bio
->bi_iter
.bi_size
) {
8072 dip
->flags
|= BTRFS_DIO_ORIG_BIO_SUBMITTED
;
8076 /* async crcs make it difficult to collect full stripe writes. */
8077 if (btrfs_get_alloc_profile(root
, 1) & BTRFS_BLOCK_GROUP_RAID56_MASK
)
8082 bio
= btrfs_dio_bio_alloc(orig_bio
->bi_bdev
, start_sector
, GFP_NOFS
);
8086 bio
->bi_private
= dip
;
8087 bio
->bi_end_io
= btrfs_end_dio_bio
;
8088 btrfs_io_bio(bio
)->logical
= file_offset
;
8089 atomic_inc(&dip
->pending_bios
);
8091 while (bvec
<= (orig_bio
->bi_io_vec
+ orig_bio
->bi_vcnt
- 1)) {
8092 if (map_length
< submit_len
+ bvec
->bv_len
||
8093 bio_add_page(bio
, bvec
->bv_page
, bvec
->bv_len
,
8094 bvec
->bv_offset
) < bvec
->bv_len
) {
8096 * inc the count before we submit the bio so
8097 * we know the end IO handler won't happen before
8098 * we inc the count. Otherwise, the dip might get freed
8099 * before we're done setting it up
8101 atomic_inc(&dip
->pending_bios
);
8102 ret
= __btrfs_submit_dio_bio(bio
, inode
, rw
,
8103 file_offset
, skip_sum
,
8107 atomic_dec(&dip
->pending_bios
);
8111 start_sector
+= submit_len
>> 9;
8112 file_offset
+= submit_len
;
8117 bio
= btrfs_dio_bio_alloc(orig_bio
->bi_bdev
,
8118 start_sector
, GFP_NOFS
);
8121 bio
->bi_private
= dip
;
8122 bio
->bi_end_io
= btrfs_end_dio_bio
;
8123 btrfs_io_bio(bio
)->logical
= file_offset
;
8125 map_length
= orig_bio
->bi_iter
.bi_size
;
8126 ret
= btrfs_map_block(root
->fs_info
, rw
,
8128 &map_length
, NULL
, 0);
8134 submit_len
+= bvec
->bv_len
;
8141 ret
= __btrfs_submit_dio_bio(bio
, inode
, rw
, file_offset
, skip_sum
,
8150 * before atomic variable goto zero, we must
8151 * make sure dip->errors is perceived to be set.
8153 smp_mb__before_atomic();
8154 if (atomic_dec_and_test(&dip
->pending_bios
))
8155 bio_io_error(dip
->orig_bio
);
8157 /* bio_end_io() will handle error, so we needn't return it */
8161 static void btrfs_submit_direct(int rw
, struct bio
*dio_bio
,
8162 struct inode
*inode
, loff_t file_offset
)
8164 struct btrfs_dio_private
*dip
= NULL
;
8165 struct bio
*io_bio
= NULL
;
8166 struct btrfs_io_bio
*btrfs_bio
;
8168 int write
= rw
& REQ_WRITE
;
8171 skip_sum
= BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
;
8173 io_bio
= btrfs_bio_clone(dio_bio
, GFP_NOFS
);
8179 dip
= kzalloc(sizeof(*dip
), GFP_NOFS
);
8185 dip
->private = dio_bio
->bi_private
;
8187 dip
->logical_offset
= file_offset
;
8188 dip
->bytes
= dio_bio
->bi_iter
.bi_size
;
8189 dip
->disk_bytenr
= (u64
)dio_bio
->bi_iter
.bi_sector
<< 9;
8190 io_bio
->bi_private
= dip
;
8191 dip
->orig_bio
= io_bio
;
8192 dip
->dio_bio
= dio_bio
;
8193 atomic_set(&dip
->pending_bios
, 0);
8194 btrfs_bio
= btrfs_io_bio(io_bio
);
8195 btrfs_bio
->logical
= file_offset
;
8198 io_bio
->bi_end_io
= btrfs_endio_direct_write
;
8200 io_bio
->bi_end_io
= btrfs_endio_direct_read
;
8201 dip
->subio_endio
= btrfs_subio_endio_read
;
8204 ret
= btrfs_submit_direct_hook(rw
, dip
, skip_sum
);
8208 if (btrfs_bio
->end_io
)
8209 btrfs_bio
->end_io(btrfs_bio
, ret
);
8213 * If we arrived here it means either we failed to submit the dip
8214 * or we either failed to clone the dio_bio or failed to allocate the
8215 * dip. If we cloned the dio_bio and allocated the dip, we can just
8216 * call bio_endio against our io_bio so that we get proper resource
8217 * cleanup if we fail to submit the dip, otherwise, we must do the
8218 * same as btrfs_endio_direct_[write|read] because we can't call these
8219 * callbacks - they require an allocated dip and a clone of dio_bio.
8221 if (io_bio
&& dip
) {
8222 io_bio
->bi_error
= -EIO
;
8225 * The end io callbacks free our dip, do the final put on io_bio
8226 * and all the cleanup and final put for dio_bio (through
8233 struct btrfs_ordered_extent
*ordered
;
8235 ordered
= btrfs_lookup_ordered_extent(inode
,
8237 set_bit(BTRFS_ORDERED_IOERR
, &ordered
->flags
);
8239 * Decrements our ref on the ordered extent and removes
8240 * the ordered extent from the inode's ordered tree,
8241 * doing all the proper resource cleanup such as for the
8242 * reserved space and waking up any waiters for this
8243 * ordered extent (through btrfs_remove_ordered_extent).
8245 btrfs_finish_ordered_io(ordered
);
8247 unlock_extent(&BTRFS_I(inode
)->io_tree
, file_offset
,
8248 file_offset
+ dio_bio
->bi_iter
.bi_size
- 1);
8250 dio_bio
->bi_error
= -EIO
;
8252 * Releases and cleans up our dio_bio, no need to bio_put()
8253 * nor bio_endio()/bio_io_error() against dio_bio.
8255 dio_end_io(dio_bio
, ret
);
8262 static ssize_t
check_direct_IO(struct btrfs_root
*root
, struct kiocb
*iocb
,
8263 const struct iov_iter
*iter
, loff_t offset
)
8267 unsigned blocksize_mask
= root
->sectorsize
- 1;
8268 ssize_t retval
= -EINVAL
;
8270 if (offset
& blocksize_mask
)
8273 if (iov_iter_alignment(iter
) & blocksize_mask
)
8276 /* If this is a write we don't need to check anymore */
8277 if (iov_iter_rw(iter
) == WRITE
)
8280 * Check to make sure we don't have duplicate iov_base's in this
8281 * iovec, if so return EINVAL, otherwise we'll get csum errors
8282 * when reading back.
8284 for (seg
= 0; seg
< iter
->nr_segs
; seg
++) {
8285 for (i
= seg
+ 1; i
< iter
->nr_segs
; i
++) {
8286 if (iter
->iov
[seg
].iov_base
== iter
->iov
[i
].iov_base
)
8295 static ssize_t
btrfs_direct_IO(struct kiocb
*iocb
, struct iov_iter
*iter
,
8298 struct file
*file
= iocb
->ki_filp
;
8299 struct inode
*inode
= file
->f_mapping
->host
;
8300 u64 outstanding_extents
= 0;
8304 bool relock
= false;
8307 if (check_direct_IO(BTRFS_I(inode
)->root
, iocb
, iter
, offset
))
8310 inode_dio_begin(inode
);
8311 smp_mb__after_atomic();
8314 * The generic stuff only does filemap_write_and_wait_range, which
8315 * isn't enough if we've written compressed pages to this area, so
8316 * we need to flush the dirty pages again to make absolutely sure
8317 * that any outstanding dirty pages are on disk.
8319 count
= iov_iter_count(iter
);
8320 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
8321 &BTRFS_I(inode
)->runtime_flags
))
8322 filemap_fdatawrite_range(inode
->i_mapping
, offset
,
8323 offset
+ count
- 1);
8325 if (iov_iter_rw(iter
) == WRITE
) {
8327 * If the write DIO is beyond the EOF, we need update
8328 * the isize, but it is protected by i_mutex. So we can
8329 * not unlock the i_mutex at this case.
8331 if (offset
+ count
<= inode
->i_size
) {
8332 mutex_unlock(&inode
->i_mutex
);
8335 ret
= btrfs_delalloc_reserve_space(inode
, count
);
8338 outstanding_extents
= div64_u64(count
+
8339 BTRFS_MAX_EXTENT_SIZE
- 1,
8340 BTRFS_MAX_EXTENT_SIZE
);
8343 * We need to know how many extents we reserved so that we can
8344 * do the accounting properly if we go over the number we
8345 * originally calculated. Abuse current->journal_info for this.
8347 current
->journal_info
= &outstanding_extents
;
8348 } else if (test_bit(BTRFS_INODE_READDIO_NEED_LOCK
,
8349 &BTRFS_I(inode
)->runtime_flags
)) {
8350 inode_dio_end(inode
);
8351 flags
= DIO_LOCKING
| DIO_SKIP_HOLES
;
8355 ret
= __blockdev_direct_IO(iocb
, inode
,
8356 BTRFS_I(inode
)->root
->fs_info
->fs_devices
->latest_bdev
,
8357 iter
, offset
, btrfs_get_blocks_direct
, NULL
,
8358 btrfs_submit_direct
, flags
);
8359 if (iov_iter_rw(iter
) == WRITE
) {
8360 current
->journal_info
= NULL
;
8361 if (ret
< 0 && ret
!= -EIOCBQUEUED
) {
8363 * If the error comes from submitting stage,
8364 * btrfs_get_blocsk_direct() has free'd data space,
8365 * and metadata space will be handled by
8366 * finish_ordered_fn, don't do that again to make
8367 * sure bytes_may_use is correct.
8369 if (!test_and_clear_bit(BTRFS_INODE_DIO_READY
,
8370 &BTRFS_I(inode
)->runtime_flags
))
8371 btrfs_delalloc_release_space(inode
, count
);
8372 } else if (ret
>= 0 && (size_t)ret
< count
)
8373 btrfs_delalloc_release_space(inode
,
8374 count
- (size_t)ret
);
8378 inode_dio_end(inode
);
8380 mutex_lock(&inode
->i_mutex
);
8385 #define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC)
8387 static int btrfs_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
8388 __u64 start
, __u64 len
)
8392 ret
= fiemap_check_flags(fieinfo
, BTRFS_FIEMAP_FLAGS
);
8396 return extent_fiemap(inode
, fieinfo
, start
, len
, btrfs_get_extent_fiemap
);
8399 int btrfs_readpage(struct file
*file
, struct page
*page
)
8401 struct extent_io_tree
*tree
;
8402 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
8403 return extent_read_full_page(tree
, page
, btrfs_get_extent
, 0);
8406 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
8408 struct extent_io_tree
*tree
;
8411 if (current
->flags
& PF_MEMALLOC
) {
8412 redirty_page_for_writepage(wbc
, page
);
8416 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
8417 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
8420 static int btrfs_writepages(struct address_space
*mapping
,
8421 struct writeback_control
*wbc
)
8423 struct extent_io_tree
*tree
;
8425 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
8426 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
8430 btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
8431 struct list_head
*pages
, unsigned nr_pages
)
8433 struct extent_io_tree
*tree
;
8434 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
8435 return extent_readpages(tree
, mapping
, pages
, nr_pages
,
8438 static int __btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
8440 struct extent_io_tree
*tree
;
8441 struct extent_map_tree
*map
;
8444 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
8445 map
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
8446 ret
= try_release_extent_mapping(map
, tree
, page
, gfp_flags
);
8448 ClearPagePrivate(page
);
8449 set_page_private(page
, 0);
8450 page_cache_release(page
);
8455 static int btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
8457 if (PageWriteback(page
) || PageDirty(page
))
8459 return __btrfs_releasepage(page
, gfp_flags
& GFP_NOFS
);
8462 static void btrfs_invalidatepage(struct page
*page
, unsigned int offset
,
8463 unsigned int length
)
8465 struct inode
*inode
= page
->mapping
->host
;
8466 struct extent_io_tree
*tree
;
8467 struct btrfs_ordered_extent
*ordered
;
8468 struct extent_state
*cached_state
= NULL
;
8469 u64 page_start
= page_offset(page
);
8470 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
8471 int inode_evicting
= inode
->i_state
& I_FREEING
;
8474 * we have the page locked, so new writeback can't start,
8475 * and the dirty bit won't be cleared while we are here.
8477 * Wait for IO on this page so that we can safely clear
8478 * the PagePrivate2 bit and do ordered accounting
8480 wait_on_page_writeback(page
);
8482 tree
= &BTRFS_I(inode
)->io_tree
;
8484 btrfs_releasepage(page
, GFP_NOFS
);
8488 if (!inode_evicting
)
8489 lock_extent_bits(tree
, page_start
, page_end
, 0, &cached_state
);
8490 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
8493 * IO on this page will never be started, so we need
8494 * to account for any ordered extents now
8496 if (!inode_evicting
)
8497 clear_extent_bit(tree
, page_start
, page_end
,
8498 EXTENT_DIRTY
| EXTENT_DELALLOC
|
8499 EXTENT_LOCKED
| EXTENT_DO_ACCOUNTING
|
8500 EXTENT_DEFRAG
, 1, 0, &cached_state
,
8503 * whoever cleared the private bit is responsible
8504 * for the finish_ordered_io
8506 if (TestClearPagePrivate2(page
)) {
8507 struct btrfs_ordered_inode_tree
*tree
;
8510 tree
= &BTRFS_I(inode
)->ordered_tree
;
8512 spin_lock_irq(&tree
->lock
);
8513 set_bit(BTRFS_ORDERED_TRUNCATED
, &ordered
->flags
);
8514 new_len
= page_start
- ordered
->file_offset
;
8515 if (new_len
< ordered
->truncated_len
)
8516 ordered
->truncated_len
= new_len
;
8517 spin_unlock_irq(&tree
->lock
);
8519 if (btrfs_dec_test_ordered_pending(inode
, &ordered
,
8521 PAGE_CACHE_SIZE
, 1))
8522 btrfs_finish_ordered_io(ordered
);
8524 btrfs_put_ordered_extent(ordered
);
8525 if (!inode_evicting
) {
8526 cached_state
= NULL
;
8527 lock_extent_bits(tree
, page_start
, page_end
, 0,
8532 if (!inode_evicting
) {
8533 clear_extent_bit(tree
, page_start
, page_end
,
8534 EXTENT_LOCKED
| EXTENT_DIRTY
|
8535 EXTENT_DELALLOC
| EXTENT_DO_ACCOUNTING
|
8536 EXTENT_DEFRAG
, 1, 1,
8537 &cached_state
, GFP_NOFS
);
8539 __btrfs_releasepage(page
, GFP_NOFS
);
8542 ClearPageChecked(page
);
8543 if (PagePrivate(page
)) {
8544 ClearPagePrivate(page
);
8545 set_page_private(page
, 0);
8546 page_cache_release(page
);
8551 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
8552 * called from a page fault handler when a page is first dirtied. Hence we must
8553 * be careful to check for EOF conditions here. We set the page up correctly
8554 * for a written page which means we get ENOSPC checking when writing into
8555 * holes and correct delalloc and unwritten extent mapping on filesystems that
8556 * support these features.
8558 * We are not allowed to take the i_mutex here so we have to play games to
8559 * protect against truncate races as the page could now be beyond EOF. Because
8560 * vmtruncate() writes the inode size before removing pages, once we have the
8561 * page lock we can determine safely if the page is beyond EOF. If it is not
8562 * beyond EOF, then the page is guaranteed safe against truncation until we
8565 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
8567 struct page
*page
= vmf
->page
;
8568 struct inode
*inode
= file_inode(vma
->vm_file
);
8569 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8570 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
8571 struct btrfs_ordered_extent
*ordered
;
8572 struct extent_state
*cached_state
= NULL
;
8574 unsigned long zero_start
;
8581 sb_start_pagefault(inode
->i_sb
);
8582 ret
= btrfs_delalloc_reserve_space(inode
, PAGE_CACHE_SIZE
);
8584 ret
= file_update_time(vma
->vm_file
);
8590 else /* -ENOSPC, -EIO, etc */
8591 ret
= VM_FAULT_SIGBUS
;
8597 ret
= VM_FAULT_NOPAGE
; /* make the VM retry the fault */
8600 size
= i_size_read(inode
);
8601 page_start
= page_offset(page
);
8602 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
8604 if ((page
->mapping
!= inode
->i_mapping
) ||
8605 (page_start
>= size
)) {
8606 /* page got truncated out from underneath us */
8609 wait_on_page_writeback(page
);
8611 lock_extent_bits(io_tree
, page_start
, page_end
, 0, &cached_state
);
8612 set_page_extent_mapped(page
);
8615 * we can't set the delalloc bits if there are pending ordered
8616 * extents. Drop our locks and wait for them to finish
8618 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
8620 unlock_extent_cached(io_tree
, page_start
, page_end
,
8621 &cached_state
, GFP_NOFS
);
8623 btrfs_start_ordered_extent(inode
, ordered
, 1);
8624 btrfs_put_ordered_extent(ordered
);
8629 * XXX - page_mkwrite gets called every time the page is dirtied, even
8630 * if it was already dirty, so for space accounting reasons we need to
8631 * clear any delalloc bits for the range we are fixing to save. There
8632 * is probably a better way to do this, but for now keep consistent with
8633 * prepare_pages in the normal write path.
8635 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
,
8636 EXTENT_DIRTY
| EXTENT_DELALLOC
|
8637 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
,
8638 0, 0, &cached_state
, GFP_NOFS
);
8640 ret
= btrfs_set_extent_delalloc(inode
, page_start
, page_end
,
8643 unlock_extent_cached(io_tree
, page_start
, page_end
,
8644 &cached_state
, GFP_NOFS
);
8645 ret
= VM_FAULT_SIGBUS
;
8650 /* page is wholly or partially inside EOF */
8651 if (page_start
+ PAGE_CACHE_SIZE
> size
)
8652 zero_start
= size
& ~PAGE_CACHE_MASK
;
8654 zero_start
= PAGE_CACHE_SIZE
;
8656 if (zero_start
!= PAGE_CACHE_SIZE
) {
8658 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
8659 flush_dcache_page(page
);
8662 ClearPageChecked(page
);
8663 set_page_dirty(page
);
8664 SetPageUptodate(page
);
8666 BTRFS_I(inode
)->last_trans
= root
->fs_info
->generation
;
8667 BTRFS_I(inode
)->last_sub_trans
= BTRFS_I(inode
)->root
->log_transid
;
8668 BTRFS_I(inode
)->last_log_commit
= BTRFS_I(inode
)->root
->last_log_commit
;
8670 unlock_extent_cached(io_tree
, page_start
, page_end
, &cached_state
, GFP_NOFS
);
8674 sb_end_pagefault(inode
->i_sb
);
8675 return VM_FAULT_LOCKED
;
8679 btrfs_delalloc_release_space(inode
, PAGE_CACHE_SIZE
);
8681 sb_end_pagefault(inode
->i_sb
);
8685 static int btrfs_truncate(struct inode
*inode
)
8687 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8688 struct btrfs_block_rsv
*rsv
;
8691 struct btrfs_trans_handle
*trans
;
8692 u64 mask
= root
->sectorsize
- 1;
8693 u64 min_size
= btrfs_calc_trunc_metadata_size(root
, 1);
8695 ret
= btrfs_wait_ordered_range(inode
, inode
->i_size
& (~mask
),
8701 * Yes ladies and gentelment, this is indeed ugly. The fact is we have
8702 * 3 things going on here
8704 * 1) We need to reserve space for our orphan item and the space to
8705 * delete our orphan item. Lord knows we don't want to have a dangling
8706 * orphan item because we didn't reserve space to remove it.
8708 * 2) We need to reserve space to update our inode.
8710 * 3) We need to have something to cache all the space that is going to
8711 * be free'd up by the truncate operation, but also have some slack
8712 * space reserved in case it uses space during the truncate (thank you
8713 * very much snapshotting).
8715 * And we need these to all be seperate. The fact is we can use alot of
8716 * space doing the truncate, and we have no earthly idea how much space
8717 * we will use, so we need the truncate reservation to be seperate so it
8718 * doesn't end up using space reserved for updating the inode or
8719 * removing the orphan item. We also need to be able to stop the
8720 * transaction and start a new one, which means we need to be able to
8721 * update the inode several times, and we have no idea of knowing how
8722 * many times that will be, so we can't just reserve 1 item for the
8723 * entirety of the opration, so that has to be done seperately as well.
8724 * Then there is the orphan item, which does indeed need to be held on
8725 * to for the whole operation, and we need nobody to touch this reserved
8726 * space except the orphan code.
8728 * So that leaves us with
8730 * 1) root->orphan_block_rsv - for the orphan deletion.
8731 * 2) rsv - for the truncate reservation, which we will steal from the
8732 * transaction reservation.
8733 * 3) fs_info->trans_block_rsv - this will have 1 items worth left for
8734 * updating the inode.
8736 rsv
= btrfs_alloc_block_rsv(root
, BTRFS_BLOCK_RSV_TEMP
);
8739 rsv
->size
= min_size
;
8743 * 1 for the truncate slack space
8744 * 1 for updating the inode.
8746 trans
= btrfs_start_transaction(root
, 2);
8747 if (IS_ERR(trans
)) {
8748 err
= PTR_ERR(trans
);
8752 /* Migrate the slack space for the truncate to our reserve */
8753 ret
= btrfs_block_rsv_migrate(&root
->fs_info
->trans_block_rsv
, rsv
,
8758 * So if we truncate and then write and fsync we normally would just
8759 * write the extents that changed, which is a problem if we need to
8760 * first truncate that entire inode. So set this flag so we write out
8761 * all of the extents in the inode to the sync log so we're completely
8764 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &BTRFS_I(inode
)->runtime_flags
);
8765 trans
->block_rsv
= rsv
;
8768 ret
= btrfs_truncate_inode_items(trans
, root
, inode
,
8770 BTRFS_EXTENT_DATA_KEY
);
8771 if (ret
!= -ENOSPC
&& ret
!= -EAGAIN
) {
8776 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
8777 ret
= btrfs_update_inode(trans
, root
, inode
);
8783 btrfs_end_transaction(trans
, root
);
8784 btrfs_btree_balance_dirty(root
);
8786 trans
= btrfs_start_transaction(root
, 2);
8787 if (IS_ERR(trans
)) {
8788 ret
= err
= PTR_ERR(trans
);
8793 ret
= btrfs_block_rsv_migrate(&root
->fs_info
->trans_block_rsv
,
8795 BUG_ON(ret
); /* shouldn't happen */
8796 trans
->block_rsv
= rsv
;
8799 if (ret
== 0 && inode
->i_nlink
> 0) {
8800 trans
->block_rsv
= root
->orphan_block_rsv
;
8801 ret
= btrfs_orphan_del(trans
, inode
);
8807 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
8808 ret
= btrfs_update_inode(trans
, root
, inode
);
8812 ret
= btrfs_end_transaction(trans
, root
);
8813 btrfs_btree_balance_dirty(root
);
8817 btrfs_free_block_rsv(root
, rsv
);
8826 * create a new subvolume directory/inode (helper for the ioctl).
8828 int btrfs_create_subvol_root(struct btrfs_trans_handle
*trans
,
8829 struct btrfs_root
*new_root
,
8830 struct btrfs_root
*parent_root
,
8833 struct inode
*inode
;
8837 inode
= btrfs_new_inode(trans
, new_root
, NULL
, "..", 2,
8838 new_dirid
, new_dirid
,
8839 S_IFDIR
| (~current_umask() & S_IRWXUGO
),
8842 return PTR_ERR(inode
);
8843 inode
->i_op
= &btrfs_dir_inode_operations
;
8844 inode
->i_fop
= &btrfs_dir_file_operations
;
8846 set_nlink(inode
, 1);
8847 btrfs_i_size_write(inode
, 0);
8848 unlock_new_inode(inode
);
8850 err
= btrfs_subvol_inherit_props(trans
, new_root
, parent_root
);
8852 btrfs_err(new_root
->fs_info
,
8853 "error inheriting subvolume %llu properties: %d",
8854 new_root
->root_key
.objectid
, err
);
8856 err
= btrfs_update_inode(trans
, new_root
, inode
);
8862 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
8864 struct btrfs_inode
*ei
;
8865 struct inode
*inode
;
8867 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
8874 ei
->last_sub_trans
= 0;
8875 ei
->logged_trans
= 0;
8876 ei
->delalloc_bytes
= 0;
8877 ei
->defrag_bytes
= 0;
8878 ei
->disk_i_size
= 0;
8881 ei
->index_cnt
= (u64
)-1;
8883 ei
->last_unlink_trans
= 0;
8884 ei
->last_log_commit
= 0;
8886 spin_lock_init(&ei
->lock
);
8887 ei
->outstanding_extents
= 0;
8888 ei
->reserved_extents
= 0;
8890 ei
->runtime_flags
= 0;
8891 ei
->force_compress
= BTRFS_COMPRESS_NONE
;
8893 ei
->delayed_node
= NULL
;
8895 ei
->i_otime
.tv_sec
= 0;
8896 ei
->i_otime
.tv_nsec
= 0;
8898 inode
= &ei
->vfs_inode
;
8899 extent_map_tree_init(&ei
->extent_tree
);
8900 extent_io_tree_init(&ei
->io_tree
, &inode
->i_data
);
8901 extent_io_tree_init(&ei
->io_failure_tree
, &inode
->i_data
);
8902 ei
->io_tree
.track_uptodate
= 1;
8903 ei
->io_failure_tree
.track_uptodate
= 1;
8904 atomic_set(&ei
->sync_writers
, 0);
8905 mutex_init(&ei
->log_mutex
);
8906 mutex_init(&ei
->delalloc_mutex
);
8907 btrfs_ordered_inode_tree_init(&ei
->ordered_tree
);
8908 INIT_LIST_HEAD(&ei
->delalloc_inodes
);
8909 RB_CLEAR_NODE(&ei
->rb_node
);
8914 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
8915 void btrfs_test_destroy_inode(struct inode
*inode
)
8917 btrfs_drop_extent_cache(inode
, 0, (u64
)-1, 0);
8918 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
8922 static void btrfs_i_callback(struct rcu_head
*head
)
8924 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
8925 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
8928 void btrfs_destroy_inode(struct inode
*inode
)
8930 struct btrfs_ordered_extent
*ordered
;
8931 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8933 WARN_ON(!hlist_empty(&inode
->i_dentry
));
8934 WARN_ON(inode
->i_data
.nrpages
);
8935 WARN_ON(BTRFS_I(inode
)->outstanding_extents
);
8936 WARN_ON(BTRFS_I(inode
)->reserved_extents
);
8937 WARN_ON(BTRFS_I(inode
)->delalloc_bytes
);
8938 WARN_ON(BTRFS_I(inode
)->csum_bytes
);
8939 WARN_ON(BTRFS_I(inode
)->defrag_bytes
);
8942 * This can happen where we create an inode, but somebody else also
8943 * created the same inode and we need to destroy the one we already
8949 if (test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
8950 &BTRFS_I(inode
)->runtime_flags
)) {
8951 btrfs_info(root
->fs_info
, "inode %llu still on the orphan list",
8953 atomic_dec(&root
->orphan_inodes
);
8957 ordered
= btrfs_lookup_first_ordered_extent(inode
, (u64
)-1);
8961 btrfs_err(root
->fs_info
, "found ordered extent %llu %llu on inode cleanup",
8962 ordered
->file_offset
, ordered
->len
);
8963 btrfs_remove_ordered_extent(inode
, ordered
);
8964 btrfs_put_ordered_extent(ordered
);
8965 btrfs_put_ordered_extent(ordered
);
8968 inode_tree_del(inode
);
8969 btrfs_drop_extent_cache(inode
, 0, (u64
)-1, 0);
8971 call_rcu(&inode
->i_rcu
, btrfs_i_callback
);
8974 int btrfs_drop_inode(struct inode
*inode
)
8976 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8981 /* the snap/subvol tree is on deleting */
8982 if (btrfs_root_refs(&root
->root_item
) == 0)
8985 return generic_drop_inode(inode
);
8988 static void init_once(void *foo
)
8990 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
8992 inode_init_once(&ei
->vfs_inode
);
8995 void btrfs_destroy_cachep(void)
8998 * Make sure all delayed rcu free inodes are flushed before we
9002 if (btrfs_inode_cachep
)
9003 kmem_cache_destroy(btrfs_inode_cachep
);
9004 if (btrfs_trans_handle_cachep
)
9005 kmem_cache_destroy(btrfs_trans_handle_cachep
);
9006 if (btrfs_transaction_cachep
)
9007 kmem_cache_destroy(btrfs_transaction_cachep
);
9008 if (btrfs_path_cachep
)
9009 kmem_cache_destroy(btrfs_path_cachep
);
9010 if (btrfs_free_space_cachep
)
9011 kmem_cache_destroy(btrfs_free_space_cachep
);
9012 if (btrfs_delalloc_work_cachep
)
9013 kmem_cache_destroy(btrfs_delalloc_work_cachep
);
9016 int btrfs_init_cachep(void)
9018 btrfs_inode_cachep
= kmem_cache_create("btrfs_inode",
9019 sizeof(struct btrfs_inode
), 0,
9020 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, init_once
);
9021 if (!btrfs_inode_cachep
)
9024 btrfs_trans_handle_cachep
= kmem_cache_create("btrfs_trans_handle",
9025 sizeof(struct btrfs_trans_handle
), 0,
9026 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, NULL
);
9027 if (!btrfs_trans_handle_cachep
)
9030 btrfs_transaction_cachep
= kmem_cache_create("btrfs_transaction",
9031 sizeof(struct btrfs_transaction
), 0,
9032 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, NULL
);
9033 if (!btrfs_transaction_cachep
)
9036 btrfs_path_cachep
= kmem_cache_create("btrfs_path",
9037 sizeof(struct btrfs_path
), 0,
9038 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, NULL
);
9039 if (!btrfs_path_cachep
)
9042 btrfs_free_space_cachep
= kmem_cache_create("btrfs_free_space",
9043 sizeof(struct btrfs_free_space
), 0,
9044 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, NULL
);
9045 if (!btrfs_free_space_cachep
)
9048 btrfs_delalloc_work_cachep
= kmem_cache_create("btrfs_delalloc_work",
9049 sizeof(struct btrfs_delalloc_work
), 0,
9050 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
,
9052 if (!btrfs_delalloc_work_cachep
)
9057 btrfs_destroy_cachep();
9061 static int btrfs_getattr(struct vfsmount
*mnt
,
9062 struct dentry
*dentry
, struct kstat
*stat
)
9065 struct inode
*inode
= d_inode(dentry
);
9066 u32 blocksize
= inode
->i_sb
->s_blocksize
;
9068 generic_fillattr(inode
, stat
);
9069 stat
->dev
= BTRFS_I(inode
)->root
->anon_dev
;
9070 stat
->blksize
= PAGE_CACHE_SIZE
;
9072 spin_lock(&BTRFS_I(inode
)->lock
);
9073 delalloc_bytes
= BTRFS_I(inode
)->delalloc_bytes
;
9074 spin_unlock(&BTRFS_I(inode
)->lock
);
9075 stat
->blocks
= (ALIGN(inode_get_bytes(inode
), blocksize
) +
9076 ALIGN(delalloc_bytes
, blocksize
)) >> 9;
9080 static int btrfs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
9081 struct inode
*new_dir
, struct dentry
*new_dentry
)
9083 struct btrfs_trans_handle
*trans
;
9084 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
9085 struct btrfs_root
*dest
= BTRFS_I(new_dir
)->root
;
9086 struct inode
*new_inode
= d_inode(new_dentry
);
9087 struct inode
*old_inode
= d_inode(old_dentry
);
9088 struct timespec ctime
= CURRENT_TIME
;
9092 u64 old_ino
= btrfs_ino(old_inode
);
9094 if (btrfs_ino(new_dir
) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)
9097 /* we only allow rename subvolume link between subvolumes */
9098 if (old_ino
!= BTRFS_FIRST_FREE_OBJECTID
&& root
!= dest
)
9101 if (old_ino
== BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
||
9102 (new_inode
&& btrfs_ino(new_inode
) == BTRFS_FIRST_FREE_OBJECTID
))
9105 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
9106 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
9110 /* check for collisions, even if the name isn't there */
9111 ret
= btrfs_check_dir_item_collision(dest
, new_dir
->i_ino
,
9112 new_dentry
->d_name
.name
,
9113 new_dentry
->d_name
.len
);
9116 if (ret
== -EEXIST
) {
9118 * eexist without a new_inode */
9119 if (WARN_ON(!new_inode
)) {
9123 /* maybe -EOVERFLOW */
9130 * we're using rename to replace one file with another. Start IO on it
9131 * now so we don't add too much work to the end of the transaction
9133 if (new_inode
&& S_ISREG(old_inode
->i_mode
) && new_inode
->i_size
)
9134 filemap_flush(old_inode
->i_mapping
);
9136 /* close the racy window with snapshot create/destroy ioctl */
9137 if (old_ino
== BTRFS_FIRST_FREE_OBJECTID
)
9138 down_read(&root
->fs_info
->subvol_sem
);
9140 * We want to reserve the absolute worst case amount of items. So if
9141 * both inodes are subvols and we need to unlink them then that would
9142 * require 4 item modifications, but if they are both normal inodes it
9143 * would require 5 item modifications, so we'll assume their normal
9144 * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items
9145 * should cover the worst case number of items we'll modify.
9147 trans
= btrfs_start_transaction(root
, 11);
9148 if (IS_ERR(trans
)) {
9149 ret
= PTR_ERR(trans
);
9154 btrfs_record_root_in_trans(trans
, dest
);
9156 ret
= btrfs_set_inode_index(new_dir
, &index
);
9160 BTRFS_I(old_inode
)->dir_index
= 0ULL;
9161 if (unlikely(old_ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
9162 /* force full log commit if subvolume involved. */
9163 btrfs_set_log_full_commit(root
->fs_info
, trans
);
9165 ret
= btrfs_insert_inode_ref(trans
, dest
,
9166 new_dentry
->d_name
.name
,
9167 new_dentry
->d_name
.len
,
9169 btrfs_ino(new_dir
), index
);
9173 * this is an ugly little race, but the rename is required
9174 * to make sure that if we crash, the inode is either at the
9175 * old name or the new one. pinning the log transaction lets
9176 * us make sure we don't allow a log commit to come in after
9177 * we unlink the name but before we add the new name back in.
9179 btrfs_pin_log_trans(root
);
9182 inode_inc_iversion(old_dir
);
9183 inode_inc_iversion(new_dir
);
9184 inode_inc_iversion(old_inode
);
9185 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
9186 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
9187 old_inode
->i_ctime
= ctime
;
9189 if (old_dentry
->d_parent
!= new_dentry
->d_parent
)
9190 btrfs_record_unlink_dir(trans
, old_dir
, old_inode
, 1);
9192 if (unlikely(old_ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
9193 root_objectid
= BTRFS_I(old_inode
)->root
->root_key
.objectid
;
9194 ret
= btrfs_unlink_subvol(trans
, root
, old_dir
, root_objectid
,
9195 old_dentry
->d_name
.name
,
9196 old_dentry
->d_name
.len
);
9198 ret
= __btrfs_unlink_inode(trans
, root
, old_dir
,
9199 d_inode(old_dentry
),
9200 old_dentry
->d_name
.name
,
9201 old_dentry
->d_name
.len
);
9203 ret
= btrfs_update_inode(trans
, root
, old_inode
);
9206 btrfs_abort_transaction(trans
, root
, ret
);
9211 inode_inc_iversion(new_inode
);
9212 new_inode
->i_ctime
= CURRENT_TIME
;
9213 if (unlikely(btrfs_ino(new_inode
) ==
9214 BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)) {
9215 root_objectid
= BTRFS_I(new_inode
)->location
.objectid
;
9216 ret
= btrfs_unlink_subvol(trans
, dest
, new_dir
,
9218 new_dentry
->d_name
.name
,
9219 new_dentry
->d_name
.len
);
9220 BUG_ON(new_inode
->i_nlink
== 0);
9222 ret
= btrfs_unlink_inode(trans
, dest
, new_dir
,
9223 d_inode(new_dentry
),
9224 new_dentry
->d_name
.name
,
9225 new_dentry
->d_name
.len
);
9227 if (!ret
&& new_inode
->i_nlink
== 0)
9228 ret
= btrfs_orphan_add(trans
, d_inode(new_dentry
));
9230 btrfs_abort_transaction(trans
, root
, ret
);
9235 ret
= btrfs_add_link(trans
, new_dir
, old_inode
,
9236 new_dentry
->d_name
.name
,
9237 new_dentry
->d_name
.len
, 0, index
);
9239 btrfs_abort_transaction(trans
, root
, ret
);
9243 if (old_inode
->i_nlink
== 1)
9244 BTRFS_I(old_inode
)->dir_index
= index
;
9246 if (old_ino
!= BTRFS_FIRST_FREE_OBJECTID
) {
9247 struct dentry
*parent
= new_dentry
->d_parent
;
9248 btrfs_log_new_name(trans
, old_inode
, old_dir
, parent
);
9249 btrfs_end_log_trans(root
);
9252 btrfs_end_transaction(trans
, root
);
9254 if (old_ino
== BTRFS_FIRST_FREE_OBJECTID
)
9255 up_read(&root
->fs_info
->subvol_sem
);
9260 static int btrfs_rename2(struct inode
*old_dir
, struct dentry
*old_dentry
,
9261 struct inode
*new_dir
, struct dentry
*new_dentry
,
9264 if (flags
& ~RENAME_NOREPLACE
)
9267 return btrfs_rename(old_dir
, old_dentry
, new_dir
, new_dentry
);
9270 static void btrfs_run_delalloc_work(struct btrfs_work
*work
)
9272 struct btrfs_delalloc_work
*delalloc_work
;
9273 struct inode
*inode
;
9275 delalloc_work
= container_of(work
, struct btrfs_delalloc_work
,
9277 inode
= delalloc_work
->inode
;
9278 if (delalloc_work
->wait
) {
9279 btrfs_wait_ordered_range(inode
, 0, (u64
)-1);
9281 filemap_flush(inode
->i_mapping
);
9282 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
9283 &BTRFS_I(inode
)->runtime_flags
))
9284 filemap_flush(inode
->i_mapping
);
9287 if (delalloc_work
->delay_iput
)
9288 btrfs_add_delayed_iput(inode
);
9291 complete(&delalloc_work
->completion
);
9294 struct btrfs_delalloc_work
*btrfs_alloc_delalloc_work(struct inode
*inode
,
9295 int wait
, int delay_iput
)
9297 struct btrfs_delalloc_work
*work
;
9299 work
= kmem_cache_zalloc(btrfs_delalloc_work_cachep
, GFP_NOFS
);
9303 init_completion(&work
->completion
);
9304 INIT_LIST_HEAD(&work
->list
);
9305 work
->inode
= inode
;
9307 work
->delay_iput
= delay_iput
;
9308 WARN_ON_ONCE(!inode
);
9309 btrfs_init_work(&work
->work
, btrfs_flush_delalloc_helper
,
9310 btrfs_run_delalloc_work
, NULL
, NULL
);
9315 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work
*work
)
9317 wait_for_completion(&work
->completion
);
9318 kmem_cache_free(btrfs_delalloc_work_cachep
, work
);
9322 * some fairly slow code that needs optimization. This walks the list
9323 * of all the inodes with pending delalloc and forces them to disk.
9325 static int __start_delalloc_inodes(struct btrfs_root
*root
, int delay_iput
,
9328 struct btrfs_inode
*binode
;
9329 struct inode
*inode
;
9330 struct btrfs_delalloc_work
*work
, *next
;
9331 struct list_head works
;
9332 struct list_head splice
;
9335 INIT_LIST_HEAD(&works
);
9336 INIT_LIST_HEAD(&splice
);
9338 mutex_lock(&root
->delalloc_mutex
);
9339 spin_lock(&root
->delalloc_lock
);
9340 list_splice_init(&root
->delalloc_inodes
, &splice
);
9341 while (!list_empty(&splice
)) {
9342 binode
= list_entry(splice
.next
, struct btrfs_inode
,
9345 list_move_tail(&binode
->delalloc_inodes
,
9346 &root
->delalloc_inodes
);
9347 inode
= igrab(&binode
->vfs_inode
);
9349 cond_resched_lock(&root
->delalloc_lock
);
9352 spin_unlock(&root
->delalloc_lock
);
9354 work
= btrfs_alloc_delalloc_work(inode
, 0, delay_iput
);
9357 btrfs_add_delayed_iput(inode
);
9363 list_add_tail(&work
->list
, &works
);
9364 btrfs_queue_work(root
->fs_info
->flush_workers
,
9367 if (nr
!= -1 && ret
>= nr
)
9370 spin_lock(&root
->delalloc_lock
);
9372 spin_unlock(&root
->delalloc_lock
);
9375 list_for_each_entry_safe(work
, next
, &works
, list
) {
9376 list_del_init(&work
->list
);
9377 btrfs_wait_and_free_delalloc_work(work
);
9380 if (!list_empty_careful(&splice
)) {
9381 spin_lock(&root
->delalloc_lock
);
9382 list_splice_tail(&splice
, &root
->delalloc_inodes
);
9383 spin_unlock(&root
->delalloc_lock
);
9385 mutex_unlock(&root
->delalloc_mutex
);
9389 int btrfs_start_delalloc_inodes(struct btrfs_root
*root
, int delay_iput
)
9393 if (test_bit(BTRFS_FS_STATE_ERROR
, &root
->fs_info
->fs_state
))
9396 ret
= __start_delalloc_inodes(root
, delay_iput
, -1);
9400 * the filemap_flush will queue IO into the worker threads, but
9401 * we have to make sure the IO is actually started and that
9402 * ordered extents get created before we return
9404 atomic_inc(&root
->fs_info
->async_submit_draining
);
9405 while (atomic_read(&root
->fs_info
->nr_async_submits
) ||
9406 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
9407 wait_event(root
->fs_info
->async_submit_wait
,
9408 (atomic_read(&root
->fs_info
->nr_async_submits
) == 0 &&
9409 atomic_read(&root
->fs_info
->async_delalloc_pages
) == 0));
9411 atomic_dec(&root
->fs_info
->async_submit_draining
);
9415 int btrfs_start_delalloc_roots(struct btrfs_fs_info
*fs_info
, int delay_iput
,
9418 struct btrfs_root
*root
;
9419 struct list_head splice
;
9422 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
))
9425 INIT_LIST_HEAD(&splice
);
9427 mutex_lock(&fs_info
->delalloc_root_mutex
);
9428 spin_lock(&fs_info
->delalloc_root_lock
);
9429 list_splice_init(&fs_info
->delalloc_roots
, &splice
);
9430 while (!list_empty(&splice
) && nr
) {
9431 root
= list_first_entry(&splice
, struct btrfs_root
,
9433 root
= btrfs_grab_fs_root(root
);
9435 list_move_tail(&root
->delalloc_root
,
9436 &fs_info
->delalloc_roots
);
9437 spin_unlock(&fs_info
->delalloc_root_lock
);
9439 ret
= __start_delalloc_inodes(root
, delay_iput
, nr
);
9440 btrfs_put_fs_root(root
);
9448 spin_lock(&fs_info
->delalloc_root_lock
);
9450 spin_unlock(&fs_info
->delalloc_root_lock
);
9453 atomic_inc(&fs_info
->async_submit_draining
);
9454 while (atomic_read(&fs_info
->nr_async_submits
) ||
9455 atomic_read(&fs_info
->async_delalloc_pages
)) {
9456 wait_event(fs_info
->async_submit_wait
,
9457 (atomic_read(&fs_info
->nr_async_submits
) == 0 &&
9458 atomic_read(&fs_info
->async_delalloc_pages
) == 0));
9460 atomic_dec(&fs_info
->async_submit_draining
);
9462 if (!list_empty_careful(&splice
)) {
9463 spin_lock(&fs_info
->delalloc_root_lock
);
9464 list_splice_tail(&splice
, &fs_info
->delalloc_roots
);
9465 spin_unlock(&fs_info
->delalloc_root_lock
);
9467 mutex_unlock(&fs_info
->delalloc_root_mutex
);
9471 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
9472 const char *symname
)
9474 struct btrfs_trans_handle
*trans
;
9475 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
9476 struct btrfs_path
*path
;
9477 struct btrfs_key key
;
9478 struct inode
*inode
= NULL
;
9486 struct btrfs_file_extent_item
*ei
;
9487 struct extent_buffer
*leaf
;
9489 name_len
= strlen(symname
);
9490 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
9491 return -ENAMETOOLONG
;
9494 * 2 items for inode item and ref
9495 * 2 items for dir items
9496 * 1 item for xattr if selinux is on
9498 trans
= btrfs_start_transaction(root
, 5);
9500 return PTR_ERR(trans
);
9502 err
= btrfs_find_free_ino(root
, &objectid
);
9506 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
9507 dentry
->d_name
.len
, btrfs_ino(dir
), objectid
,
9508 S_IFLNK
|S_IRWXUGO
, &index
);
9509 if (IS_ERR(inode
)) {
9510 err
= PTR_ERR(inode
);
9515 * If the active LSM wants to access the inode during
9516 * d_instantiate it needs these. Smack checks to see
9517 * if the filesystem supports xattrs by looking at the
9520 inode
->i_fop
= &btrfs_file_operations
;
9521 inode
->i_op
= &btrfs_file_inode_operations
;
9522 inode
->i_mapping
->a_ops
= &btrfs_aops
;
9523 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
9525 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
9527 goto out_unlock_inode
;
9529 err
= btrfs_add_nondir(trans
, dir
, dentry
, inode
, 0, index
);
9531 goto out_unlock_inode
;
9533 path
= btrfs_alloc_path();
9536 goto out_unlock_inode
;
9538 key
.objectid
= btrfs_ino(inode
);
9540 key
.type
= BTRFS_EXTENT_DATA_KEY
;
9541 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
9542 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
9545 btrfs_free_path(path
);
9546 goto out_unlock_inode
;
9548 leaf
= path
->nodes
[0];
9549 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
9550 struct btrfs_file_extent_item
);
9551 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
9552 btrfs_set_file_extent_type(leaf
, ei
,
9553 BTRFS_FILE_EXTENT_INLINE
);
9554 btrfs_set_file_extent_encryption(leaf
, ei
, 0);
9555 btrfs_set_file_extent_compression(leaf
, ei
, 0);
9556 btrfs_set_file_extent_other_encoding(leaf
, ei
, 0);
9557 btrfs_set_file_extent_ram_bytes(leaf
, ei
, name_len
);
9559 ptr
= btrfs_file_extent_inline_start(ei
);
9560 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
9561 btrfs_mark_buffer_dirty(leaf
);
9562 btrfs_free_path(path
);
9564 inode
->i_op
= &btrfs_symlink_inode_operations
;
9565 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
9566 inode_set_bytes(inode
, name_len
);
9567 btrfs_i_size_write(inode
, name_len
);
9568 err
= btrfs_update_inode(trans
, root
, inode
);
9571 goto out_unlock_inode
;
9574 unlock_new_inode(inode
);
9575 d_instantiate(dentry
, inode
);
9578 btrfs_end_transaction(trans
, root
);
9580 inode_dec_link_count(inode
);
9583 btrfs_btree_balance_dirty(root
);
9588 unlock_new_inode(inode
);
9592 static int __btrfs_prealloc_file_range(struct inode
*inode
, int mode
,
9593 u64 start
, u64 num_bytes
, u64 min_size
,
9594 loff_t actual_len
, u64
*alloc_hint
,
9595 struct btrfs_trans_handle
*trans
)
9597 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
9598 struct extent_map
*em
;
9599 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
9600 struct btrfs_key ins
;
9601 u64 cur_offset
= start
;
9605 bool own_trans
= true;
9609 while (num_bytes
> 0) {
9611 trans
= btrfs_start_transaction(root
, 3);
9612 if (IS_ERR(trans
)) {
9613 ret
= PTR_ERR(trans
);
9618 cur_bytes
= min(num_bytes
, 256ULL * 1024 * 1024);
9619 cur_bytes
= max(cur_bytes
, min_size
);
9620 ret
= btrfs_reserve_extent(root
, cur_bytes
, min_size
, 0,
9621 *alloc_hint
, &ins
, 1, 0);
9624 btrfs_end_transaction(trans
, root
);
9628 ret
= insert_reserved_file_extent(trans
, inode
,
9629 cur_offset
, ins
.objectid
,
9630 ins
.offset
, ins
.offset
,
9631 ins
.offset
, 0, 0, 0,
9632 BTRFS_FILE_EXTENT_PREALLOC
);
9634 btrfs_free_reserved_extent(root
, ins
.objectid
,
9636 btrfs_abort_transaction(trans
, root
, ret
);
9638 btrfs_end_transaction(trans
, root
);
9642 btrfs_drop_extent_cache(inode
, cur_offset
,
9643 cur_offset
+ ins
.offset
-1, 0);
9645 em
= alloc_extent_map();
9647 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
9648 &BTRFS_I(inode
)->runtime_flags
);
9652 em
->start
= cur_offset
;
9653 em
->orig_start
= cur_offset
;
9654 em
->len
= ins
.offset
;
9655 em
->block_start
= ins
.objectid
;
9656 em
->block_len
= ins
.offset
;
9657 em
->orig_block_len
= ins
.offset
;
9658 em
->ram_bytes
= ins
.offset
;
9659 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
9660 set_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
);
9661 em
->generation
= trans
->transid
;
9664 write_lock(&em_tree
->lock
);
9665 ret
= add_extent_mapping(em_tree
, em
, 1);
9666 write_unlock(&em_tree
->lock
);
9669 btrfs_drop_extent_cache(inode
, cur_offset
,
9670 cur_offset
+ ins
.offset
- 1,
9673 free_extent_map(em
);
9675 num_bytes
-= ins
.offset
;
9676 cur_offset
+= ins
.offset
;
9677 *alloc_hint
= ins
.objectid
+ ins
.offset
;
9679 inode_inc_iversion(inode
);
9680 inode
->i_ctime
= CURRENT_TIME
;
9681 BTRFS_I(inode
)->flags
|= BTRFS_INODE_PREALLOC
;
9682 if (!(mode
& FALLOC_FL_KEEP_SIZE
) &&
9683 (actual_len
> inode
->i_size
) &&
9684 (cur_offset
> inode
->i_size
)) {
9685 if (cur_offset
> actual_len
)
9686 i_size
= actual_len
;
9688 i_size
= cur_offset
;
9689 i_size_write(inode
, i_size
);
9690 btrfs_ordered_update_i_size(inode
, i_size
, NULL
);
9693 ret
= btrfs_update_inode(trans
, root
, inode
);
9696 btrfs_abort_transaction(trans
, root
, ret
);
9698 btrfs_end_transaction(trans
, root
);
9703 btrfs_end_transaction(trans
, root
);
9708 int btrfs_prealloc_file_range(struct inode
*inode
, int mode
,
9709 u64 start
, u64 num_bytes
, u64 min_size
,
9710 loff_t actual_len
, u64
*alloc_hint
)
9712 return __btrfs_prealloc_file_range(inode
, mode
, start
, num_bytes
,
9713 min_size
, actual_len
, alloc_hint
,
9717 int btrfs_prealloc_file_range_trans(struct inode
*inode
,
9718 struct btrfs_trans_handle
*trans
, int mode
,
9719 u64 start
, u64 num_bytes
, u64 min_size
,
9720 loff_t actual_len
, u64
*alloc_hint
)
9722 return __btrfs_prealloc_file_range(inode
, mode
, start
, num_bytes
,
9723 min_size
, actual_len
, alloc_hint
, trans
);
9726 static int btrfs_set_page_dirty(struct page
*page
)
9728 return __set_page_dirty_nobuffers(page
);
9731 static int btrfs_permission(struct inode
*inode
, int mask
)
9733 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
9734 umode_t mode
= inode
->i_mode
;
9736 if (mask
& MAY_WRITE
&&
9737 (S_ISREG(mode
) || S_ISDIR(mode
) || S_ISLNK(mode
))) {
9738 if (btrfs_root_readonly(root
))
9740 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_READONLY
)
9743 return generic_permission(inode
, mask
);
9746 static int btrfs_tmpfile(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
9748 struct btrfs_trans_handle
*trans
;
9749 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
9750 struct inode
*inode
= NULL
;
9756 * 5 units required for adding orphan entry
9758 trans
= btrfs_start_transaction(root
, 5);
9760 return PTR_ERR(trans
);
9762 ret
= btrfs_find_free_ino(root
, &objectid
);
9766 inode
= btrfs_new_inode(trans
, root
, dir
, NULL
, 0,
9767 btrfs_ino(dir
), objectid
, mode
, &index
);
9768 if (IS_ERR(inode
)) {
9769 ret
= PTR_ERR(inode
);
9774 inode
->i_fop
= &btrfs_file_operations
;
9775 inode
->i_op
= &btrfs_file_inode_operations
;
9777 inode
->i_mapping
->a_ops
= &btrfs_aops
;
9778 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
9780 ret
= btrfs_init_inode_security(trans
, inode
, dir
, NULL
);
9784 ret
= btrfs_update_inode(trans
, root
, inode
);
9787 ret
= btrfs_orphan_add(trans
, inode
);
9792 * We set number of links to 0 in btrfs_new_inode(), and here we set
9793 * it to 1 because d_tmpfile() will issue a warning if the count is 0,
9796 * d_tmpfile() -> inode_dec_link_count() -> drop_nlink()
9798 set_nlink(inode
, 1);
9799 unlock_new_inode(inode
);
9800 d_tmpfile(dentry
, inode
);
9801 mark_inode_dirty(inode
);
9804 btrfs_end_transaction(trans
, root
);
9807 btrfs_balance_delayed_items(root
);
9808 btrfs_btree_balance_dirty(root
);
9812 unlock_new_inode(inode
);
9817 /* Inspired by filemap_check_errors() */
9818 int btrfs_inode_check_errors(struct inode
*inode
)
9822 if (test_bit(AS_ENOSPC
, &inode
->i_mapping
->flags
) &&
9823 test_and_clear_bit(AS_ENOSPC
, &inode
->i_mapping
->flags
))
9825 if (test_bit(AS_EIO
, &inode
->i_mapping
->flags
) &&
9826 test_and_clear_bit(AS_EIO
, &inode
->i_mapping
->flags
))
9832 static const struct inode_operations btrfs_dir_inode_operations
= {
9833 .getattr
= btrfs_getattr
,
9834 .lookup
= btrfs_lookup
,
9835 .create
= btrfs_create
,
9836 .unlink
= btrfs_unlink
,
9838 .mkdir
= btrfs_mkdir
,
9839 .rmdir
= btrfs_rmdir
,
9840 .rename2
= btrfs_rename2
,
9841 .symlink
= btrfs_symlink
,
9842 .setattr
= btrfs_setattr
,
9843 .mknod
= btrfs_mknod
,
9844 .setxattr
= btrfs_setxattr
,
9845 .getxattr
= btrfs_getxattr
,
9846 .listxattr
= btrfs_listxattr
,
9847 .removexattr
= btrfs_removexattr
,
9848 .permission
= btrfs_permission
,
9849 .get_acl
= btrfs_get_acl
,
9850 .set_acl
= btrfs_set_acl
,
9851 .update_time
= btrfs_update_time
,
9852 .tmpfile
= btrfs_tmpfile
,
9854 static const struct inode_operations btrfs_dir_ro_inode_operations
= {
9855 .lookup
= btrfs_lookup
,
9856 .permission
= btrfs_permission
,
9857 .get_acl
= btrfs_get_acl
,
9858 .set_acl
= btrfs_set_acl
,
9859 .update_time
= btrfs_update_time
,
9862 static const struct file_operations btrfs_dir_file_operations
= {
9863 .llseek
= generic_file_llseek
,
9864 .read
= generic_read_dir
,
9865 .iterate
= btrfs_real_readdir
,
9866 .unlocked_ioctl
= btrfs_ioctl
,
9867 #ifdef CONFIG_COMPAT
9868 .compat_ioctl
= btrfs_ioctl
,
9870 .release
= btrfs_release_file
,
9871 .fsync
= btrfs_sync_file
,
9874 static struct extent_io_ops btrfs_extent_io_ops
= {
9875 .fill_delalloc
= run_delalloc_range
,
9876 .submit_bio_hook
= btrfs_submit_bio_hook
,
9877 .merge_bio_hook
= btrfs_merge_bio_hook
,
9878 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
9879 .writepage_end_io_hook
= btrfs_writepage_end_io_hook
,
9880 .writepage_start_hook
= btrfs_writepage_start_hook
,
9881 .set_bit_hook
= btrfs_set_bit_hook
,
9882 .clear_bit_hook
= btrfs_clear_bit_hook
,
9883 .merge_extent_hook
= btrfs_merge_extent_hook
,
9884 .split_extent_hook
= btrfs_split_extent_hook
,
9888 * btrfs doesn't support the bmap operation because swapfiles
9889 * use bmap to make a mapping of extents in the file. They assume
9890 * these extents won't change over the life of the file and they
9891 * use the bmap result to do IO directly to the drive.
9893 * the btrfs bmap call would return logical addresses that aren't
9894 * suitable for IO and they also will change frequently as COW
9895 * operations happen. So, swapfile + btrfs == corruption.
9897 * For now we're avoiding this by dropping bmap.
9899 static const struct address_space_operations btrfs_aops
= {
9900 .readpage
= btrfs_readpage
,
9901 .writepage
= btrfs_writepage
,
9902 .writepages
= btrfs_writepages
,
9903 .readpages
= btrfs_readpages
,
9904 .direct_IO
= btrfs_direct_IO
,
9905 .invalidatepage
= btrfs_invalidatepage
,
9906 .releasepage
= btrfs_releasepage
,
9907 .set_page_dirty
= btrfs_set_page_dirty
,
9908 .error_remove_page
= generic_error_remove_page
,
9911 static const struct address_space_operations btrfs_symlink_aops
= {
9912 .readpage
= btrfs_readpage
,
9913 .writepage
= btrfs_writepage
,
9914 .invalidatepage
= btrfs_invalidatepage
,
9915 .releasepage
= btrfs_releasepage
,
9918 static const struct inode_operations btrfs_file_inode_operations
= {
9919 .getattr
= btrfs_getattr
,
9920 .setattr
= btrfs_setattr
,
9921 .setxattr
= btrfs_setxattr
,
9922 .getxattr
= btrfs_getxattr
,
9923 .listxattr
= btrfs_listxattr
,
9924 .removexattr
= btrfs_removexattr
,
9925 .permission
= btrfs_permission
,
9926 .fiemap
= btrfs_fiemap
,
9927 .get_acl
= btrfs_get_acl
,
9928 .set_acl
= btrfs_set_acl
,
9929 .update_time
= btrfs_update_time
,
9931 static const struct inode_operations btrfs_special_inode_operations
= {
9932 .getattr
= btrfs_getattr
,
9933 .setattr
= btrfs_setattr
,
9934 .permission
= btrfs_permission
,
9935 .setxattr
= btrfs_setxattr
,
9936 .getxattr
= btrfs_getxattr
,
9937 .listxattr
= btrfs_listxattr
,
9938 .removexattr
= btrfs_removexattr
,
9939 .get_acl
= btrfs_get_acl
,
9940 .set_acl
= btrfs_set_acl
,
9941 .update_time
= btrfs_update_time
,
9943 static const struct inode_operations btrfs_symlink_inode_operations
= {
9944 .readlink
= generic_readlink
,
9945 .follow_link
= page_follow_link_light
,
9946 .put_link
= page_put_link
,
9947 .getattr
= btrfs_getattr
,
9948 .setattr
= btrfs_setattr
,
9949 .permission
= btrfs_permission
,
9950 .setxattr
= btrfs_setxattr
,
9951 .getxattr
= btrfs_getxattr
,
9952 .listxattr
= btrfs_listxattr
,
9953 .removexattr
= btrfs_removexattr
,
9954 .update_time
= btrfs_update_time
,
9957 const struct dentry_operations btrfs_dentry_operations
= {
9958 .d_delete
= btrfs_dentry_delete
,
9959 .d_release
= btrfs_dentry_release
,