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/aio.h>
36 #include <linux/bit_spinlock.h>
37 #include <linux/xattr.h>
38 #include <linux/posix_acl.h>
39 #include <linux/falloc.h>
40 #include <linux/slab.h>
41 #include <linux/ratelimit.h>
42 #include <linux/mount.h>
43 #include <linux/btrfs.h>
44 #include <linux/blkdev.h>
45 #include <linux/posix_acl_xattr.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"
63 struct btrfs_iget_args
{
64 struct btrfs_key
*location
;
65 struct btrfs_root
*root
;
68 static const struct inode_operations btrfs_dir_inode_operations
;
69 static const struct inode_operations btrfs_symlink_inode_operations
;
70 static const struct inode_operations btrfs_dir_ro_inode_operations
;
71 static const struct inode_operations btrfs_special_inode_operations
;
72 static const struct inode_operations btrfs_file_inode_operations
;
73 static const struct address_space_operations btrfs_aops
;
74 static const struct address_space_operations btrfs_symlink_aops
;
75 static const struct file_operations btrfs_dir_file_operations
;
76 static struct extent_io_ops btrfs_extent_io_ops
;
78 static struct kmem_cache
*btrfs_inode_cachep
;
79 static struct kmem_cache
*btrfs_delalloc_work_cachep
;
80 struct kmem_cache
*btrfs_trans_handle_cachep
;
81 struct kmem_cache
*btrfs_transaction_cachep
;
82 struct kmem_cache
*btrfs_path_cachep
;
83 struct kmem_cache
*btrfs_free_space_cachep
;
86 static unsigned char btrfs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
87 [S_IFREG
>> S_SHIFT
] = BTRFS_FT_REG_FILE
,
88 [S_IFDIR
>> S_SHIFT
] = BTRFS_FT_DIR
,
89 [S_IFCHR
>> S_SHIFT
] = BTRFS_FT_CHRDEV
,
90 [S_IFBLK
>> S_SHIFT
] = BTRFS_FT_BLKDEV
,
91 [S_IFIFO
>> S_SHIFT
] = BTRFS_FT_FIFO
,
92 [S_IFSOCK
>> S_SHIFT
] = BTRFS_FT_SOCK
,
93 [S_IFLNK
>> S_SHIFT
] = BTRFS_FT_SYMLINK
,
96 static int btrfs_setsize(struct inode
*inode
, struct iattr
*attr
);
97 static int btrfs_truncate(struct inode
*inode
);
98 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent
*ordered_extent
);
99 static noinline
int cow_file_range(struct inode
*inode
,
100 struct page
*locked_page
,
101 u64 start
, u64 end
, int *page_started
,
102 unsigned long *nr_written
, int unlock
);
103 static struct extent_map
*create_pinned_em(struct inode
*inode
, u64 start
,
104 u64 len
, u64 orig_start
,
105 u64 block_start
, u64 block_len
,
106 u64 orig_block_len
, u64 ram_bytes
,
109 static int btrfs_dirty_inode(struct inode
*inode
);
111 static int btrfs_init_inode_security(struct btrfs_trans_handle
*trans
,
112 struct inode
*inode
, struct inode
*dir
,
113 const struct qstr
*qstr
)
117 err
= btrfs_init_acl(trans
, inode
, dir
);
119 err
= btrfs_xattr_security_init(trans
, inode
, dir
, qstr
);
124 * this does all the hard work for inserting an inline extent into
125 * the btree. The caller should have done a btrfs_drop_extents so that
126 * no overlapping inline items exist in the btree
128 static noinline
int insert_inline_extent(struct btrfs_trans_handle
*trans
,
129 struct btrfs_path
*path
, int extent_inserted
,
130 struct btrfs_root
*root
, struct inode
*inode
,
131 u64 start
, size_t size
, size_t compressed_size
,
133 struct page
**compressed_pages
)
135 struct extent_buffer
*leaf
;
136 struct page
*page
= NULL
;
139 struct btrfs_file_extent_item
*ei
;
142 size_t cur_size
= size
;
143 unsigned long offset
;
145 if (compressed_size
&& compressed_pages
)
146 cur_size
= compressed_size
;
148 inode_add_bytes(inode
, size
);
150 if (!extent_inserted
) {
151 struct btrfs_key key
;
154 key
.objectid
= btrfs_ino(inode
);
156 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
158 datasize
= btrfs_file_extent_calc_inline_size(cur_size
);
159 path
->leave_spinning
= 1;
160 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
167 leaf
= path
->nodes
[0];
168 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
169 struct btrfs_file_extent_item
);
170 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
171 btrfs_set_file_extent_type(leaf
, ei
, BTRFS_FILE_EXTENT_INLINE
);
172 btrfs_set_file_extent_encryption(leaf
, ei
, 0);
173 btrfs_set_file_extent_other_encoding(leaf
, ei
, 0);
174 btrfs_set_file_extent_ram_bytes(leaf
, ei
, size
);
175 ptr
= btrfs_file_extent_inline_start(ei
);
177 if (compress_type
!= BTRFS_COMPRESS_NONE
) {
180 while (compressed_size
> 0) {
181 cpage
= compressed_pages
[i
];
182 cur_size
= min_t(unsigned long, compressed_size
,
185 kaddr
= kmap_atomic(cpage
);
186 write_extent_buffer(leaf
, kaddr
, ptr
, cur_size
);
187 kunmap_atomic(kaddr
);
191 compressed_size
-= cur_size
;
193 btrfs_set_file_extent_compression(leaf
, ei
,
196 page
= find_get_page(inode
->i_mapping
,
197 start
>> PAGE_CACHE_SHIFT
);
198 btrfs_set_file_extent_compression(leaf
, ei
, 0);
199 kaddr
= kmap_atomic(page
);
200 offset
= start
& (PAGE_CACHE_SIZE
- 1);
201 write_extent_buffer(leaf
, kaddr
+ offset
, ptr
, size
);
202 kunmap_atomic(kaddr
);
203 page_cache_release(page
);
205 btrfs_mark_buffer_dirty(leaf
);
206 btrfs_release_path(path
);
209 * we're an inline extent, so nobody can
210 * extend the file past i_size without locking
211 * a page we already have locked.
213 * We must do any isize and inode updates
214 * before we unlock the pages. Otherwise we
215 * could end up racing with unlink.
217 BTRFS_I(inode
)->disk_i_size
= inode
->i_size
;
218 ret
= btrfs_update_inode(trans
, root
, inode
);
227 * conditionally insert an inline extent into the file. This
228 * does the checks required to make sure the data is small enough
229 * to fit as an inline extent.
231 static noinline
int cow_file_range_inline(struct btrfs_root
*root
,
232 struct inode
*inode
, u64 start
,
233 u64 end
, size_t compressed_size
,
235 struct page
**compressed_pages
)
237 struct btrfs_trans_handle
*trans
;
238 u64 isize
= i_size_read(inode
);
239 u64 actual_end
= min(end
+ 1, isize
);
240 u64 inline_len
= actual_end
- start
;
241 u64 aligned_end
= ALIGN(end
, root
->sectorsize
);
242 u64 data_len
= inline_len
;
244 struct btrfs_path
*path
;
245 int extent_inserted
= 0;
246 u32 extent_item_size
;
249 data_len
= compressed_size
;
252 actual_end
>= PAGE_CACHE_SIZE
||
253 data_len
>= BTRFS_MAX_INLINE_DATA_SIZE(root
) ||
255 (actual_end
& (root
->sectorsize
- 1)) == 0) ||
257 data_len
> root
->fs_info
->max_inline
) {
261 path
= btrfs_alloc_path();
265 trans
= btrfs_join_transaction(root
);
267 btrfs_free_path(path
);
268 return PTR_ERR(trans
);
270 trans
->block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
272 if (compressed_size
&& compressed_pages
)
273 extent_item_size
= btrfs_file_extent_calc_inline_size(
276 extent_item_size
= btrfs_file_extent_calc_inline_size(
279 ret
= __btrfs_drop_extents(trans
, root
, inode
, path
,
280 start
, aligned_end
, NULL
,
281 1, 1, extent_item_size
, &extent_inserted
);
283 btrfs_abort_transaction(trans
, root
, ret
);
287 if (isize
> actual_end
)
288 inline_len
= min_t(u64
, isize
, actual_end
);
289 ret
= insert_inline_extent(trans
, path
, extent_inserted
,
291 inline_len
, compressed_size
,
292 compress_type
, compressed_pages
);
293 if (ret
&& ret
!= -ENOSPC
) {
294 btrfs_abort_transaction(trans
, root
, ret
);
296 } else if (ret
== -ENOSPC
) {
301 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &BTRFS_I(inode
)->runtime_flags
);
302 btrfs_delalloc_release_metadata(inode
, end
+ 1 - start
);
303 btrfs_drop_extent_cache(inode
, start
, aligned_end
- 1, 0);
305 btrfs_free_path(path
);
306 btrfs_end_transaction(trans
, root
);
310 struct async_extent
{
315 unsigned long nr_pages
;
317 struct list_head list
;
322 struct btrfs_root
*root
;
323 struct page
*locked_page
;
326 struct list_head extents
;
327 struct btrfs_work work
;
330 static noinline
int add_async_extent(struct async_cow
*cow
,
331 u64 start
, u64 ram_size
,
334 unsigned long nr_pages
,
337 struct async_extent
*async_extent
;
339 async_extent
= kmalloc(sizeof(*async_extent
), GFP_NOFS
);
340 BUG_ON(!async_extent
); /* -ENOMEM */
341 async_extent
->start
= start
;
342 async_extent
->ram_size
= ram_size
;
343 async_extent
->compressed_size
= compressed_size
;
344 async_extent
->pages
= pages
;
345 async_extent
->nr_pages
= nr_pages
;
346 async_extent
->compress_type
= compress_type
;
347 list_add_tail(&async_extent
->list
, &cow
->extents
);
352 * we create compressed extents in two phases. The first
353 * phase compresses a range of pages that have already been
354 * locked (both pages and state bits are locked).
356 * This is done inside an ordered work queue, and the compression
357 * is spread across many cpus. The actual IO submission is step
358 * two, and the ordered work queue takes care of making sure that
359 * happens in the same order things were put onto the queue by
360 * writepages and friends.
362 * If this code finds it can't get good compression, it puts an
363 * entry onto the work queue to write the uncompressed bytes. This
364 * makes sure that both compressed inodes and uncompressed inodes
365 * are written in the same order that the flusher thread sent them
368 static noinline
int compress_file_range(struct inode
*inode
,
369 struct page
*locked_page
,
371 struct async_cow
*async_cow
,
374 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
376 u64 blocksize
= root
->sectorsize
;
378 u64 isize
= i_size_read(inode
);
380 struct page
**pages
= NULL
;
381 unsigned long nr_pages
;
382 unsigned long nr_pages_ret
= 0;
383 unsigned long total_compressed
= 0;
384 unsigned long total_in
= 0;
385 unsigned long max_compressed
= 128 * 1024;
386 unsigned long max_uncompressed
= 128 * 1024;
389 int compress_type
= root
->fs_info
->compress_type
;
392 /* if this is a small write inside eof, kick off a defrag */
393 if ((end
- start
+ 1) < 16 * 1024 &&
394 (start
> 0 || end
+ 1 < BTRFS_I(inode
)->disk_i_size
))
395 btrfs_add_inode_defrag(NULL
, inode
);
398 * skip compression for a small file range(<=blocksize) that
399 * isn't an inline extent, since it dosen't save disk space at all.
401 if ((end
- start
+ 1) <= blocksize
&&
402 (start
> 0 || end
+ 1 < BTRFS_I(inode
)->disk_i_size
))
403 goto cleanup_and_bail_uncompressed
;
405 actual_end
= min_t(u64
, isize
, end
+ 1);
408 nr_pages
= (end
>> PAGE_CACHE_SHIFT
) - (start
>> PAGE_CACHE_SHIFT
) + 1;
409 nr_pages
= min(nr_pages
, (128 * 1024UL) / PAGE_CACHE_SIZE
);
412 * we don't want to send crud past the end of i_size through
413 * compression, that's just a waste of CPU time. So, if the
414 * end of the file is before the start of our current
415 * requested range of bytes, we bail out to the uncompressed
416 * cleanup code that can deal with all of this.
418 * It isn't really the fastest way to fix things, but this is a
419 * very uncommon corner.
421 if (actual_end
<= start
)
422 goto cleanup_and_bail_uncompressed
;
424 total_compressed
= actual_end
- start
;
426 /* we want to make sure that amount of ram required to uncompress
427 * an extent is reasonable, so we limit the total size in ram
428 * of a compressed extent to 128k. This is a crucial number
429 * because it also controls how easily we can spread reads across
430 * cpus for decompression.
432 * We also want to make sure the amount of IO required to do
433 * a random read is reasonably small, so we limit the size of
434 * a compressed extent to 128k.
436 total_compressed
= min(total_compressed
, max_uncompressed
);
437 num_bytes
= ALIGN(end
- start
+ 1, blocksize
);
438 num_bytes
= max(blocksize
, num_bytes
);
443 * we do compression for mount -o compress and when the
444 * inode has not been flagged as nocompress. This flag can
445 * change at any time if we discover bad compression ratios.
447 if (!(BTRFS_I(inode
)->flags
& BTRFS_INODE_NOCOMPRESS
) &&
448 (btrfs_test_opt(root
, COMPRESS
) ||
449 (BTRFS_I(inode
)->force_compress
) ||
450 (BTRFS_I(inode
)->flags
& BTRFS_INODE_COMPRESS
))) {
452 pages
= kzalloc(sizeof(struct page
*) * nr_pages
, GFP_NOFS
);
454 /* just bail out to the uncompressed code */
458 if (BTRFS_I(inode
)->force_compress
)
459 compress_type
= BTRFS_I(inode
)->force_compress
;
462 * we need to call clear_page_dirty_for_io on each
463 * page in the range. Otherwise applications with the file
464 * mmap'd can wander in and change the page contents while
465 * we are compressing them.
467 * If the compression fails for any reason, we set the pages
468 * dirty again later on.
470 extent_range_clear_dirty_for_io(inode
, start
, end
);
472 ret
= btrfs_compress_pages(compress_type
,
473 inode
->i_mapping
, start
,
474 total_compressed
, pages
,
475 nr_pages
, &nr_pages_ret
,
481 unsigned long offset
= total_compressed
&
482 (PAGE_CACHE_SIZE
- 1);
483 struct page
*page
= pages
[nr_pages_ret
- 1];
486 /* zero the tail end of the last page, we might be
487 * sending it down to disk
490 kaddr
= kmap_atomic(page
);
491 memset(kaddr
+ offset
, 0,
492 PAGE_CACHE_SIZE
- offset
);
493 kunmap_atomic(kaddr
);
500 /* lets try to make an inline extent */
501 if (ret
|| total_in
< (actual_end
- start
)) {
502 /* we didn't compress the entire range, try
503 * to make an uncompressed inline extent.
505 ret
= cow_file_range_inline(root
, inode
, start
, end
,
508 /* try making a compressed inline extent */
509 ret
= cow_file_range_inline(root
, inode
, start
, end
,
511 compress_type
, pages
);
514 unsigned long clear_flags
= EXTENT_DELALLOC
|
516 clear_flags
|= (ret
< 0) ? EXTENT_DO_ACCOUNTING
: 0;
519 * inline extent creation worked or returned error,
520 * we don't need to create any more async work items.
521 * Unlock and free up our temp pages.
523 extent_clear_unlock_delalloc(inode
, start
, end
, NULL
,
524 clear_flags
, PAGE_UNLOCK
|
534 * we aren't doing an inline extent round the compressed size
535 * up to a block size boundary so the allocator does sane
538 total_compressed
= ALIGN(total_compressed
, blocksize
);
541 * one last check to make sure the compression is really a
542 * win, compare the page count read with the blocks on disk
544 total_in
= ALIGN(total_in
, PAGE_CACHE_SIZE
);
545 if (total_compressed
>= total_in
) {
548 num_bytes
= total_in
;
551 if (!will_compress
&& pages
) {
553 * the compression code ran but failed to make things smaller,
554 * free any pages it allocated and our page pointer array
556 for (i
= 0; i
< nr_pages_ret
; i
++) {
557 WARN_ON(pages
[i
]->mapping
);
558 page_cache_release(pages
[i
]);
562 total_compressed
= 0;
565 /* flag the file so we don't compress in the future */
566 if (!btrfs_test_opt(root
, FORCE_COMPRESS
) &&
567 !(BTRFS_I(inode
)->force_compress
)) {
568 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NOCOMPRESS
;
574 /* the async work queues will take care of doing actual
575 * allocation on disk for these compressed pages,
576 * and will submit them to the elevator.
578 add_async_extent(async_cow
, start
, num_bytes
,
579 total_compressed
, pages
, nr_pages_ret
,
582 if (start
+ num_bytes
< end
) {
589 cleanup_and_bail_uncompressed
:
591 * No compression, but we still need to write the pages in
592 * the file we've been given so far. redirty the locked
593 * page if it corresponds to our extent and set things up
594 * for the async work queue to run cow_file_range to do
595 * the normal delalloc dance
597 if (page_offset(locked_page
) >= start
&&
598 page_offset(locked_page
) <= end
) {
599 __set_page_dirty_nobuffers(locked_page
);
600 /* unlocked later on in the async handlers */
603 extent_range_redirty_for_io(inode
, start
, end
);
604 add_async_extent(async_cow
, start
, end
- start
+ 1,
605 0, NULL
, 0, BTRFS_COMPRESS_NONE
);
613 for (i
= 0; i
< nr_pages_ret
; i
++) {
614 WARN_ON(pages
[i
]->mapping
);
615 page_cache_release(pages
[i
]);
623 * phase two of compressed writeback. This is the ordered portion
624 * of the code, which only gets called in the order the work was
625 * queued. We walk all the async extents created by compress_file_range
626 * and send them down to the disk.
628 static noinline
int submit_compressed_extents(struct inode
*inode
,
629 struct async_cow
*async_cow
)
631 struct async_extent
*async_extent
;
633 struct btrfs_key ins
;
634 struct extent_map
*em
;
635 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
636 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
637 struct extent_io_tree
*io_tree
;
640 if (list_empty(&async_cow
->extents
))
644 while (!list_empty(&async_cow
->extents
)) {
645 async_extent
= list_entry(async_cow
->extents
.next
,
646 struct async_extent
, list
);
647 list_del(&async_extent
->list
);
649 io_tree
= &BTRFS_I(inode
)->io_tree
;
652 /* did the compression code fall back to uncompressed IO? */
653 if (!async_extent
->pages
) {
654 int page_started
= 0;
655 unsigned long nr_written
= 0;
657 lock_extent(io_tree
, async_extent
->start
,
658 async_extent
->start
+
659 async_extent
->ram_size
- 1);
661 /* allocate blocks */
662 ret
= cow_file_range(inode
, async_cow
->locked_page
,
664 async_extent
->start
+
665 async_extent
->ram_size
- 1,
666 &page_started
, &nr_written
, 0);
671 * if page_started, cow_file_range inserted an
672 * inline extent and took care of all the unlocking
673 * and IO for us. Otherwise, we need to submit
674 * all those pages down to the drive.
676 if (!page_started
&& !ret
)
677 extent_write_locked_range(io_tree
,
678 inode
, async_extent
->start
,
679 async_extent
->start
+
680 async_extent
->ram_size
- 1,
684 unlock_page(async_cow
->locked_page
);
690 lock_extent(io_tree
, async_extent
->start
,
691 async_extent
->start
+ async_extent
->ram_size
- 1);
693 ret
= btrfs_reserve_extent(root
,
694 async_extent
->compressed_size
,
695 async_extent
->compressed_size
,
696 0, alloc_hint
, &ins
, 1);
700 for (i
= 0; i
< async_extent
->nr_pages
; i
++) {
701 WARN_ON(async_extent
->pages
[i
]->mapping
);
702 page_cache_release(async_extent
->pages
[i
]);
704 kfree(async_extent
->pages
);
705 async_extent
->nr_pages
= 0;
706 async_extent
->pages
= NULL
;
708 if (ret
== -ENOSPC
) {
709 unlock_extent(io_tree
, async_extent
->start
,
710 async_extent
->start
+
711 async_extent
->ram_size
- 1);
718 * here we're doing allocation and writeback of the
721 btrfs_drop_extent_cache(inode
, async_extent
->start
,
722 async_extent
->start
+
723 async_extent
->ram_size
- 1, 0);
725 em
= alloc_extent_map();
728 goto out_free_reserve
;
730 em
->start
= async_extent
->start
;
731 em
->len
= async_extent
->ram_size
;
732 em
->orig_start
= em
->start
;
733 em
->mod_start
= em
->start
;
734 em
->mod_len
= em
->len
;
736 em
->block_start
= ins
.objectid
;
737 em
->block_len
= ins
.offset
;
738 em
->orig_block_len
= ins
.offset
;
739 em
->ram_bytes
= async_extent
->ram_size
;
740 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
741 em
->compress_type
= async_extent
->compress_type
;
742 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
743 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
747 write_lock(&em_tree
->lock
);
748 ret
= add_extent_mapping(em_tree
, em
, 1);
749 write_unlock(&em_tree
->lock
);
750 if (ret
!= -EEXIST
) {
754 btrfs_drop_extent_cache(inode
, async_extent
->start
,
755 async_extent
->start
+
756 async_extent
->ram_size
- 1, 0);
760 goto out_free_reserve
;
762 ret
= btrfs_add_ordered_extent_compress(inode
,
765 async_extent
->ram_size
,
767 BTRFS_ORDERED_COMPRESSED
,
768 async_extent
->compress_type
);
770 goto out_free_reserve
;
773 * clear dirty, set writeback and unlock the pages.
775 extent_clear_unlock_delalloc(inode
, async_extent
->start
,
776 async_extent
->start
+
777 async_extent
->ram_size
- 1,
778 NULL
, EXTENT_LOCKED
| EXTENT_DELALLOC
,
779 PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
|
781 ret
= btrfs_submit_compressed_write(inode
,
783 async_extent
->ram_size
,
785 ins
.offset
, async_extent
->pages
,
786 async_extent
->nr_pages
);
787 alloc_hint
= ins
.objectid
+ ins
.offset
;
797 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
);
799 extent_clear_unlock_delalloc(inode
, async_extent
->start
,
800 async_extent
->start
+
801 async_extent
->ram_size
- 1,
802 NULL
, EXTENT_LOCKED
| EXTENT_DELALLOC
|
803 EXTENT_DEFRAG
| EXTENT_DO_ACCOUNTING
,
804 PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
|
805 PAGE_SET_WRITEBACK
| PAGE_END_WRITEBACK
);
810 static u64
get_extent_allocation_hint(struct inode
*inode
, u64 start
,
813 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
814 struct extent_map
*em
;
817 read_lock(&em_tree
->lock
);
818 em
= search_extent_mapping(em_tree
, start
, num_bytes
);
821 * if block start isn't an actual block number then find the
822 * first block in this inode and use that as a hint. If that
823 * block is also bogus then just don't worry about it.
825 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
827 em
= search_extent_mapping(em_tree
, 0, 0);
828 if (em
&& em
->block_start
< EXTENT_MAP_LAST_BYTE
)
829 alloc_hint
= em
->block_start
;
833 alloc_hint
= em
->block_start
;
837 read_unlock(&em_tree
->lock
);
843 * when extent_io.c finds a delayed allocation range in the file,
844 * the call backs end up in this code. The basic idea is to
845 * allocate extents on disk for the range, and create ordered data structs
846 * in ram to track those extents.
848 * locked_page is the page that writepage had locked already. We use
849 * it to make sure we don't do extra locks or unlocks.
851 * *page_started is set to one if we unlock locked_page and do everything
852 * required to start IO on it. It may be clean and already done with
855 static noinline
int cow_file_range(struct inode
*inode
,
856 struct page
*locked_page
,
857 u64 start
, u64 end
, int *page_started
,
858 unsigned long *nr_written
,
861 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
864 unsigned long ram_size
;
867 u64 blocksize
= root
->sectorsize
;
868 struct btrfs_key ins
;
869 struct extent_map
*em
;
870 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
873 if (btrfs_is_free_space_inode(inode
)) {
879 num_bytes
= ALIGN(end
- start
+ 1, blocksize
);
880 num_bytes
= max(blocksize
, num_bytes
);
881 disk_num_bytes
= num_bytes
;
883 /* if this is a small write inside eof, kick off defrag */
884 if (num_bytes
< 64 * 1024 &&
885 (start
> 0 || end
+ 1 < BTRFS_I(inode
)->disk_i_size
))
886 btrfs_add_inode_defrag(NULL
, inode
);
889 /* lets try to make an inline extent */
890 ret
= cow_file_range_inline(root
, inode
, start
, end
, 0, 0,
893 extent_clear_unlock_delalloc(inode
, start
, end
, NULL
,
894 EXTENT_LOCKED
| EXTENT_DELALLOC
|
895 EXTENT_DEFRAG
, PAGE_UNLOCK
|
896 PAGE_CLEAR_DIRTY
| PAGE_SET_WRITEBACK
|
899 *nr_written
= *nr_written
+
900 (end
- start
+ PAGE_CACHE_SIZE
) / PAGE_CACHE_SIZE
;
903 } else if (ret
< 0) {
908 BUG_ON(disk_num_bytes
>
909 btrfs_super_total_bytes(root
->fs_info
->super_copy
));
911 alloc_hint
= get_extent_allocation_hint(inode
, start
, num_bytes
);
912 btrfs_drop_extent_cache(inode
, start
, start
+ num_bytes
- 1, 0);
914 while (disk_num_bytes
> 0) {
917 cur_alloc_size
= disk_num_bytes
;
918 ret
= btrfs_reserve_extent(root
, cur_alloc_size
,
919 root
->sectorsize
, 0, alloc_hint
,
924 em
= alloc_extent_map();
930 em
->orig_start
= em
->start
;
931 ram_size
= ins
.offset
;
932 em
->len
= ins
.offset
;
933 em
->mod_start
= em
->start
;
934 em
->mod_len
= em
->len
;
936 em
->block_start
= ins
.objectid
;
937 em
->block_len
= ins
.offset
;
938 em
->orig_block_len
= ins
.offset
;
939 em
->ram_bytes
= ram_size
;
940 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
941 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
945 write_lock(&em_tree
->lock
);
946 ret
= add_extent_mapping(em_tree
, em
, 1);
947 write_unlock(&em_tree
->lock
);
948 if (ret
!= -EEXIST
) {
952 btrfs_drop_extent_cache(inode
, start
,
953 start
+ ram_size
- 1, 0);
958 cur_alloc_size
= ins
.offset
;
959 ret
= btrfs_add_ordered_extent(inode
, start
, ins
.objectid
,
960 ram_size
, cur_alloc_size
, 0);
964 if (root
->root_key
.objectid
==
965 BTRFS_DATA_RELOC_TREE_OBJECTID
) {
966 ret
= btrfs_reloc_clone_csums(inode
, start
,
972 if (disk_num_bytes
< cur_alloc_size
)
975 /* we're not doing compressed IO, don't unlock the first
976 * page (which the caller expects to stay locked), don't
977 * clear any dirty bits and don't set any writeback bits
979 * Do set the Private2 bit so we know this page was properly
980 * setup for writepage
982 op
= unlock
? PAGE_UNLOCK
: 0;
983 op
|= PAGE_SET_PRIVATE2
;
985 extent_clear_unlock_delalloc(inode
, start
,
986 start
+ ram_size
- 1, locked_page
,
987 EXTENT_LOCKED
| EXTENT_DELALLOC
,
989 disk_num_bytes
-= cur_alloc_size
;
990 num_bytes
-= cur_alloc_size
;
991 alloc_hint
= ins
.objectid
+ ins
.offset
;
992 start
+= cur_alloc_size
;
998 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
);
1000 extent_clear_unlock_delalloc(inode
, start
, end
, locked_page
,
1001 EXTENT_LOCKED
| EXTENT_DO_ACCOUNTING
|
1002 EXTENT_DELALLOC
| EXTENT_DEFRAG
,
1003 PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
|
1004 PAGE_SET_WRITEBACK
| PAGE_END_WRITEBACK
);
1009 * work queue call back to started compression on a file and pages
1011 static noinline
void async_cow_start(struct btrfs_work
*work
)
1013 struct async_cow
*async_cow
;
1015 async_cow
= container_of(work
, struct async_cow
, work
);
1017 compress_file_range(async_cow
->inode
, async_cow
->locked_page
,
1018 async_cow
->start
, async_cow
->end
, async_cow
,
1020 if (num_added
== 0) {
1021 btrfs_add_delayed_iput(async_cow
->inode
);
1022 async_cow
->inode
= NULL
;
1027 * work queue call back to submit previously compressed pages
1029 static noinline
void async_cow_submit(struct btrfs_work
*work
)
1031 struct async_cow
*async_cow
;
1032 struct btrfs_root
*root
;
1033 unsigned long nr_pages
;
1035 async_cow
= container_of(work
, struct async_cow
, work
);
1037 root
= async_cow
->root
;
1038 nr_pages
= (async_cow
->end
- async_cow
->start
+ PAGE_CACHE_SIZE
) >>
1041 if (atomic_sub_return(nr_pages
, &root
->fs_info
->async_delalloc_pages
) <
1043 waitqueue_active(&root
->fs_info
->async_submit_wait
))
1044 wake_up(&root
->fs_info
->async_submit_wait
);
1046 if (async_cow
->inode
)
1047 submit_compressed_extents(async_cow
->inode
, async_cow
);
1050 static noinline
void async_cow_free(struct btrfs_work
*work
)
1052 struct async_cow
*async_cow
;
1053 async_cow
= container_of(work
, struct async_cow
, work
);
1054 if (async_cow
->inode
)
1055 btrfs_add_delayed_iput(async_cow
->inode
);
1059 static int cow_file_range_async(struct inode
*inode
, struct page
*locked_page
,
1060 u64 start
, u64 end
, int *page_started
,
1061 unsigned long *nr_written
)
1063 struct async_cow
*async_cow
;
1064 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1065 unsigned long nr_pages
;
1067 int limit
= 10 * 1024 * 1024;
1069 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, start
, end
, EXTENT_LOCKED
,
1070 1, 0, NULL
, GFP_NOFS
);
1071 while (start
< end
) {
1072 async_cow
= kmalloc(sizeof(*async_cow
), GFP_NOFS
);
1073 BUG_ON(!async_cow
); /* -ENOMEM */
1074 async_cow
->inode
= igrab(inode
);
1075 async_cow
->root
= root
;
1076 async_cow
->locked_page
= locked_page
;
1077 async_cow
->start
= start
;
1079 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NOCOMPRESS
)
1082 cur_end
= min(end
, start
+ 512 * 1024 - 1);
1084 async_cow
->end
= cur_end
;
1085 INIT_LIST_HEAD(&async_cow
->extents
);
1087 btrfs_init_work(&async_cow
->work
, async_cow_start
,
1088 async_cow_submit
, async_cow_free
);
1090 nr_pages
= (cur_end
- start
+ PAGE_CACHE_SIZE
) >>
1092 atomic_add(nr_pages
, &root
->fs_info
->async_delalloc_pages
);
1094 btrfs_queue_work(root
->fs_info
->delalloc_workers
,
1097 if (atomic_read(&root
->fs_info
->async_delalloc_pages
) > limit
) {
1098 wait_event(root
->fs_info
->async_submit_wait
,
1099 (atomic_read(&root
->fs_info
->async_delalloc_pages
) <
1103 while (atomic_read(&root
->fs_info
->async_submit_draining
) &&
1104 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
1105 wait_event(root
->fs_info
->async_submit_wait
,
1106 (atomic_read(&root
->fs_info
->async_delalloc_pages
) ==
1110 *nr_written
+= nr_pages
;
1111 start
= cur_end
+ 1;
1117 static noinline
int csum_exist_in_range(struct btrfs_root
*root
,
1118 u64 bytenr
, u64 num_bytes
)
1121 struct btrfs_ordered_sum
*sums
;
1124 ret
= btrfs_lookup_csums_range(root
->fs_info
->csum_root
, bytenr
,
1125 bytenr
+ num_bytes
- 1, &list
, 0);
1126 if (ret
== 0 && list_empty(&list
))
1129 while (!list_empty(&list
)) {
1130 sums
= list_entry(list
.next
, struct btrfs_ordered_sum
, list
);
1131 list_del(&sums
->list
);
1138 * when nowcow writeback call back. This checks for snapshots or COW copies
1139 * of the extents that exist in the file, and COWs the file as required.
1141 * If no cow copies or snapshots exist, we write directly to the existing
1144 static noinline
int run_delalloc_nocow(struct inode
*inode
,
1145 struct page
*locked_page
,
1146 u64 start
, u64 end
, int *page_started
, int force
,
1147 unsigned long *nr_written
)
1149 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1150 struct btrfs_trans_handle
*trans
;
1151 struct extent_buffer
*leaf
;
1152 struct btrfs_path
*path
;
1153 struct btrfs_file_extent_item
*fi
;
1154 struct btrfs_key found_key
;
1169 u64 ino
= btrfs_ino(inode
);
1171 path
= btrfs_alloc_path();
1173 extent_clear_unlock_delalloc(inode
, start
, end
, locked_page
,
1174 EXTENT_LOCKED
| EXTENT_DELALLOC
|
1175 EXTENT_DO_ACCOUNTING
|
1176 EXTENT_DEFRAG
, PAGE_UNLOCK
|
1178 PAGE_SET_WRITEBACK
|
1179 PAGE_END_WRITEBACK
);
1183 nolock
= btrfs_is_free_space_inode(inode
);
1186 trans
= btrfs_join_transaction_nolock(root
);
1188 trans
= btrfs_join_transaction(root
);
1190 if (IS_ERR(trans
)) {
1191 extent_clear_unlock_delalloc(inode
, start
, end
, locked_page
,
1192 EXTENT_LOCKED
| EXTENT_DELALLOC
|
1193 EXTENT_DO_ACCOUNTING
|
1194 EXTENT_DEFRAG
, PAGE_UNLOCK
|
1196 PAGE_SET_WRITEBACK
|
1197 PAGE_END_WRITEBACK
);
1198 btrfs_free_path(path
);
1199 return PTR_ERR(trans
);
1202 trans
->block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
1204 cow_start
= (u64
)-1;
1207 ret
= btrfs_lookup_file_extent(trans
, root
, path
, ino
,
1211 if (ret
> 0 && path
->slots
[0] > 0 && check_prev
) {
1212 leaf
= path
->nodes
[0];
1213 btrfs_item_key_to_cpu(leaf
, &found_key
,
1214 path
->slots
[0] - 1);
1215 if (found_key
.objectid
== ino
&&
1216 found_key
.type
== BTRFS_EXTENT_DATA_KEY
)
1221 leaf
= path
->nodes
[0];
1222 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
1223 ret
= btrfs_next_leaf(root
, path
);
1228 leaf
= path
->nodes
[0];
1234 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1236 if (found_key
.objectid
> ino
||
1237 found_key
.type
> BTRFS_EXTENT_DATA_KEY
||
1238 found_key
.offset
> end
)
1241 if (found_key
.offset
> cur_offset
) {
1242 extent_end
= found_key
.offset
;
1247 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
1248 struct btrfs_file_extent_item
);
1249 extent_type
= btrfs_file_extent_type(leaf
, fi
);
1251 ram_bytes
= btrfs_file_extent_ram_bytes(leaf
, fi
);
1252 if (extent_type
== BTRFS_FILE_EXTENT_REG
||
1253 extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1254 disk_bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
1255 extent_offset
= btrfs_file_extent_offset(leaf
, fi
);
1256 extent_end
= found_key
.offset
+
1257 btrfs_file_extent_num_bytes(leaf
, fi
);
1259 btrfs_file_extent_disk_num_bytes(leaf
, fi
);
1260 if (extent_end
<= start
) {
1264 if (disk_bytenr
== 0)
1266 if (btrfs_file_extent_compression(leaf
, fi
) ||
1267 btrfs_file_extent_encryption(leaf
, fi
) ||
1268 btrfs_file_extent_other_encoding(leaf
, fi
))
1270 if (extent_type
== BTRFS_FILE_EXTENT_REG
&& !force
)
1272 if (btrfs_extent_readonly(root
, disk_bytenr
))
1274 if (btrfs_cross_ref_exist(trans
, root
, ino
,
1276 extent_offset
, disk_bytenr
))
1278 disk_bytenr
+= extent_offset
;
1279 disk_bytenr
+= cur_offset
- found_key
.offset
;
1280 num_bytes
= min(end
+ 1, extent_end
) - cur_offset
;
1282 * if there are pending snapshots for this root,
1283 * we fall into common COW way.
1286 err
= btrfs_start_nocow_write(root
);
1291 * force cow if csum exists in the range.
1292 * this ensure that csum for a given extent are
1293 * either valid or do not exist.
1295 if (csum_exist_in_range(root
, disk_bytenr
, num_bytes
))
1298 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
1299 extent_end
= found_key
.offset
+
1300 btrfs_file_extent_inline_len(leaf
,
1301 path
->slots
[0], fi
);
1302 extent_end
= ALIGN(extent_end
, root
->sectorsize
);
1307 if (extent_end
<= start
) {
1309 if (!nolock
&& nocow
)
1310 btrfs_end_nocow_write(root
);
1314 if (cow_start
== (u64
)-1)
1315 cow_start
= cur_offset
;
1316 cur_offset
= extent_end
;
1317 if (cur_offset
> end
)
1323 btrfs_release_path(path
);
1324 if (cow_start
!= (u64
)-1) {
1325 ret
= cow_file_range(inode
, locked_page
,
1326 cow_start
, found_key
.offset
- 1,
1327 page_started
, nr_written
, 1);
1329 if (!nolock
&& nocow
)
1330 btrfs_end_nocow_write(root
);
1333 cow_start
= (u64
)-1;
1336 if (extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1337 struct extent_map
*em
;
1338 struct extent_map_tree
*em_tree
;
1339 em_tree
= &BTRFS_I(inode
)->extent_tree
;
1340 em
= alloc_extent_map();
1341 BUG_ON(!em
); /* -ENOMEM */
1342 em
->start
= cur_offset
;
1343 em
->orig_start
= found_key
.offset
- extent_offset
;
1344 em
->len
= num_bytes
;
1345 em
->block_len
= num_bytes
;
1346 em
->block_start
= disk_bytenr
;
1347 em
->orig_block_len
= disk_num_bytes
;
1348 em
->ram_bytes
= ram_bytes
;
1349 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
1350 em
->mod_start
= em
->start
;
1351 em
->mod_len
= em
->len
;
1352 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
1353 set_bit(EXTENT_FLAG_FILLING
, &em
->flags
);
1354 em
->generation
= -1;
1356 write_lock(&em_tree
->lock
);
1357 ret
= add_extent_mapping(em_tree
, em
, 1);
1358 write_unlock(&em_tree
->lock
);
1359 if (ret
!= -EEXIST
) {
1360 free_extent_map(em
);
1363 btrfs_drop_extent_cache(inode
, em
->start
,
1364 em
->start
+ em
->len
- 1, 0);
1366 type
= BTRFS_ORDERED_PREALLOC
;
1368 type
= BTRFS_ORDERED_NOCOW
;
1371 ret
= btrfs_add_ordered_extent(inode
, cur_offset
, disk_bytenr
,
1372 num_bytes
, num_bytes
, type
);
1373 BUG_ON(ret
); /* -ENOMEM */
1375 if (root
->root_key
.objectid
==
1376 BTRFS_DATA_RELOC_TREE_OBJECTID
) {
1377 ret
= btrfs_reloc_clone_csums(inode
, cur_offset
,
1380 if (!nolock
&& nocow
)
1381 btrfs_end_nocow_write(root
);
1386 extent_clear_unlock_delalloc(inode
, cur_offset
,
1387 cur_offset
+ num_bytes
- 1,
1388 locked_page
, EXTENT_LOCKED
|
1389 EXTENT_DELALLOC
, PAGE_UNLOCK
|
1391 if (!nolock
&& nocow
)
1392 btrfs_end_nocow_write(root
);
1393 cur_offset
= extent_end
;
1394 if (cur_offset
> end
)
1397 btrfs_release_path(path
);
1399 if (cur_offset
<= end
&& cow_start
== (u64
)-1) {
1400 cow_start
= cur_offset
;
1404 if (cow_start
!= (u64
)-1) {
1405 ret
= cow_file_range(inode
, locked_page
, cow_start
, end
,
1406 page_started
, nr_written
, 1);
1412 err
= btrfs_end_transaction(trans
, root
);
1416 if (ret
&& cur_offset
< end
)
1417 extent_clear_unlock_delalloc(inode
, cur_offset
, end
,
1418 locked_page
, EXTENT_LOCKED
|
1419 EXTENT_DELALLOC
| EXTENT_DEFRAG
|
1420 EXTENT_DO_ACCOUNTING
, PAGE_UNLOCK
|
1422 PAGE_SET_WRITEBACK
|
1423 PAGE_END_WRITEBACK
);
1424 btrfs_free_path(path
);
1429 * extent_io.c call back to do delayed allocation processing
1431 static int run_delalloc_range(struct inode
*inode
, struct page
*locked_page
,
1432 u64 start
, u64 end
, int *page_started
,
1433 unsigned long *nr_written
)
1436 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1438 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
) {
1439 ret
= run_delalloc_nocow(inode
, locked_page
, start
, end
,
1440 page_started
, 1, nr_written
);
1441 } else if (BTRFS_I(inode
)->flags
& BTRFS_INODE_PREALLOC
) {
1442 ret
= run_delalloc_nocow(inode
, locked_page
, start
, end
,
1443 page_started
, 0, nr_written
);
1444 } else if (!btrfs_test_opt(root
, COMPRESS
) &&
1445 !(BTRFS_I(inode
)->force_compress
) &&
1446 !(BTRFS_I(inode
)->flags
& BTRFS_INODE_COMPRESS
)) {
1447 ret
= cow_file_range(inode
, locked_page
, start
, end
,
1448 page_started
, nr_written
, 1);
1450 set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
1451 &BTRFS_I(inode
)->runtime_flags
);
1452 ret
= cow_file_range_async(inode
, locked_page
, start
, end
,
1453 page_started
, nr_written
);
1458 static void btrfs_split_extent_hook(struct inode
*inode
,
1459 struct extent_state
*orig
, u64 split
)
1461 /* not delalloc, ignore it */
1462 if (!(orig
->state
& EXTENT_DELALLOC
))
1465 spin_lock(&BTRFS_I(inode
)->lock
);
1466 BTRFS_I(inode
)->outstanding_extents
++;
1467 spin_unlock(&BTRFS_I(inode
)->lock
);
1471 * extent_io.c merge_extent_hook, used to track merged delayed allocation
1472 * extents so we can keep track of new extents that are just merged onto old
1473 * extents, such as when we are doing sequential writes, so we can properly
1474 * account for the metadata space we'll need.
1476 static void btrfs_merge_extent_hook(struct inode
*inode
,
1477 struct extent_state
*new,
1478 struct extent_state
*other
)
1480 /* not delalloc, ignore it */
1481 if (!(other
->state
& EXTENT_DELALLOC
))
1484 spin_lock(&BTRFS_I(inode
)->lock
);
1485 BTRFS_I(inode
)->outstanding_extents
--;
1486 spin_unlock(&BTRFS_I(inode
)->lock
);
1489 static void btrfs_add_delalloc_inodes(struct btrfs_root
*root
,
1490 struct inode
*inode
)
1492 spin_lock(&root
->delalloc_lock
);
1493 if (list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
1494 list_add_tail(&BTRFS_I(inode
)->delalloc_inodes
,
1495 &root
->delalloc_inodes
);
1496 set_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1497 &BTRFS_I(inode
)->runtime_flags
);
1498 root
->nr_delalloc_inodes
++;
1499 if (root
->nr_delalloc_inodes
== 1) {
1500 spin_lock(&root
->fs_info
->delalloc_root_lock
);
1501 BUG_ON(!list_empty(&root
->delalloc_root
));
1502 list_add_tail(&root
->delalloc_root
,
1503 &root
->fs_info
->delalloc_roots
);
1504 spin_unlock(&root
->fs_info
->delalloc_root_lock
);
1507 spin_unlock(&root
->delalloc_lock
);
1510 static void btrfs_del_delalloc_inode(struct btrfs_root
*root
,
1511 struct inode
*inode
)
1513 spin_lock(&root
->delalloc_lock
);
1514 if (!list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
1515 list_del_init(&BTRFS_I(inode
)->delalloc_inodes
);
1516 clear_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1517 &BTRFS_I(inode
)->runtime_flags
);
1518 root
->nr_delalloc_inodes
--;
1519 if (!root
->nr_delalloc_inodes
) {
1520 spin_lock(&root
->fs_info
->delalloc_root_lock
);
1521 BUG_ON(list_empty(&root
->delalloc_root
));
1522 list_del_init(&root
->delalloc_root
);
1523 spin_unlock(&root
->fs_info
->delalloc_root_lock
);
1526 spin_unlock(&root
->delalloc_lock
);
1530 * extent_io.c set_bit_hook, used to track delayed allocation
1531 * bytes in this file, and to maintain the list of inodes that
1532 * have pending delalloc work to be done.
1534 static void btrfs_set_bit_hook(struct inode
*inode
,
1535 struct extent_state
*state
, unsigned long *bits
)
1539 * set_bit and clear bit hooks normally require _irqsave/restore
1540 * but in this case, we are only testing for the DELALLOC
1541 * bit, which is only set or cleared with irqs on
1543 if (!(state
->state
& EXTENT_DELALLOC
) && (*bits
& EXTENT_DELALLOC
)) {
1544 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1545 u64 len
= state
->end
+ 1 - state
->start
;
1546 bool do_list
= !btrfs_is_free_space_inode(inode
);
1548 if (*bits
& EXTENT_FIRST_DELALLOC
) {
1549 *bits
&= ~EXTENT_FIRST_DELALLOC
;
1551 spin_lock(&BTRFS_I(inode
)->lock
);
1552 BTRFS_I(inode
)->outstanding_extents
++;
1553 spin_unlock(&BTRFS_I(inode
)->lock
);
1556 __percpu_counter_add(&root
->fs_info
->delalloc_bytes
, len
,
1557 root
->fs_info
->delalloc_batch
);
1558 spin_lock(&BTRFS_I(inode
)->lock
);
1559 BTRFS_I(inode
)->delalloc_bytes
+= len
;
1560 if (do_list
&& !test_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1561 &BTRFS_I(inode
)->runtime_flags
))
1562 btrfs_add_delalloc_inodes(root
, inode
);
1563 spin_unlock(&BTRFS_I(inode
)->lock
);
1568 * extent_io.c clear_bit_hook, see set_bit_hook for why
1570 static void btrfs_clear_bit_hook(struct inode
*inode
,
1571 struct extent_state
*state
,
1572 unsigned long *bits
)
1575 * set_bit and clear bit hooks normally require _irqsave/restore
1576 * but in this case, we are only testing for the DELALLOC
1577 * bit, which is only set or cleared with irqs on
1579 if ((state
->state
& EXTENT_DELALLOC
) && (*bits
& EXTENT_DELALLOC
)) {
1580 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1581 u64 len
= state
->end
+ 1 - state
->start
;
1582 bool do_list
= !btrfs_is_free_space_inode(inode
);
1584 if (*bits
& EXTENT_FIRST_DELALLOC
) {
1585 *bits
&= ~EXTENT_FIRST_DELALLOC
;
1586 } else if (!(*bits
& EXTENT_DO_ACCOUNTING
)) {
1587 spin_lock(&BTRFS_I(inode
)->lock
);
1588 BTRFS_I(inode
)->outstanding_extents
--;
1589 spin_unlock(&BTRFS_I(inode
)->lock
);
1593 * We don't reserve metadata space for space cache inodes so we
1594 * don't need to call dellalloc_release_metadata if there is an
1597 if (*bits
& EXTENT_DO_ACCOUNTING
&&
1598 root
!= root
->fs_info
->tree_root
)
1599 btrfs_delalloc_release_metadata(inode
, len
);
1601 if (root
->root_key
.objectid
!= BTRFS_DATA_RELOC_TREE_OBJECTID
1602 && do_list
&& !(state
->state
& EXTENT_NORESERVE
))
1603 btrfs_free_reserved_data_space(inode
, len
);
1605 __percpu_counter_add(&root
->fs_info
->delalloc_bytes
, -len
,
1606 root
->fs_info
->delalloc_batch
);
1607 spin_lock(&BTRFS_I(inode
)->lock
);
1608 BTRFS_I(inode
)->delalloc_bytes
-= len
;
1609 if (do_list
&& BTRFS_I(inode
)->delalloc_bytes
== 0 &&
1610 test_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1611 &BTRFS_I(inode
)->runtime_flags
))
1612 btrfs_del_delalloc_inode(root
, inode
);
1613 spin_unlock(&BTRFS_I(inode
)->lock
);
1618 * extent_io.c merge_bio_hook, this must check the chunk tree to make sure
1619 * we don't create bios that span stripes or chunks
1621 int btrfs_merge_bio_hook(int rw
, struct page
*page
, unsigned long offset
,
1622 size_t size
, struct bio
*bio
,
1623 unsigned long bio_flags
)
1625 struct btrfs_root
*root
= BTRFS_I(page
->mapping
->host
)->root
;
1626 u64 logical
= (u64
)bio
->bi_iter
.bi_sector
<< 9;
1631 if (bio_flags
& EXTENT_BIO_COMPRESSED
)
1634 length
= bio
->bi_iter
.bi_size
;
1635 map_length
= length
;
1636 ret
= btrfs_map_block(root
->fs_info
, rw
, logical
,
1637 &map_length
, NULL
, 0);
1638 /* Will always return 0 with map_multi == NULL */
1640 if (map_length
< length
+ size
)
1646 * in order to insert checksums into the metadata in large chunks,
1647 * we wait until bio submission time. All the pages in the bio are
1648 * checksummed and sums are attached onto the ordered extent record.
1650 * At IO completion time the cums attached on the ordered extent record
1651 * are inserted into the btree
1653 static int __btrfs_submit_bio_start(struct inode
*inode
, int rw
,
1654 struct bio
*bio
, int mirror_num
,
1655 unsigned long bio_flags
,
1658 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1661 ret
= btrfs_csum_one_bio(root
, inode
, bio
, 0, 0);
1662 BUG_ON(ret
); /* -ENOMEM */
1667 * in order to insert checksums into the metadata in large chunks,
1668 * we wait until bio submission time. All the pages in the bio are
1669 * checksummed and sums are attached onto the ordered extent record.
1671 * At IO completion time the cums attached on the ordered extent record
1672 * are inserted into the btree
1674 static int __btrfs_submit_bio_done(struct inode
*inode
, int rw
, struct bio
*bio
,
1675 int mirror_num
, unsigned long bio_flags
,
1678 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1681 ret
= btrfs_map_bio(root
, rw
, bio
, mirror_num
, 1);
1683 bio_endio(bio
, ret
);
1688 * extent_io.c submission hook. This does the right thing for csum calculation
1689 * on write, or reading the csums from the tree before a read
1691 static int btrfs_submit_bio_hook(struct inode
*inode
, int rw
, struct bio
*bio
,
1692 int mirror_num
, unsigned long bio_flags
,
1695 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1699 int async
= !atomic_read(&BTRFS_I(inode
)->sync_writers
);
1701 skip_sum
= BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
;
1703 if (btrfs_is_free_space_inode(inode
))
1706 if (!(rw
& REQ_WRITE
)) {
1707 ret
= btrfs_bio_wq_end_io(root
->fs_info
, bio
, metadata
);
1711 if (bio_flags
& EXTENT_BIO_COMPRESSED
) {
1712 ret
= btrfs_submit_compressed_read(inode
, bio
,
1716 } else if (!skip_sum
) {
1717 ret
= btrfs_lookup_bio_sums(root
, inode
, bio
, NULL
);
1722 } else if (async
&& !skip_sum
) {
1723 /* csum items have already been cloned */
1724 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
)
1726 /* we're doing a write, do the async checksumming */
1727 ret
= btrfs_wq_submit_bio(BTRFS_I(inode
)->root
->fs_info
,
1728 inode
, rw
, bio
, mirror_num
,
1729 bio_flags
, bio_offset
,
1730 __btrfs_submit_bio_start
,
1731 __btrfs_submit_bio_done
);
1733 } else if (!skip_sum
) {
1734 ret
= btrfs_csum_one_bio(root
, inode
, bio
, 0, 0);
1740 ret
= btrfs_map_bio(root
, rw
, bio
, mirror_num
, 0);
1744 bio_endio(bio
, ret
);
1749 * given a list of ordered sums record them in the inode. This happens
1750 * at IO completion time based on sums calculated at bio submission time.
1752 static noinline
int add_pending_csums(struct btrfs_trans_handle
*trans
,
1753 struct inode
*inode
, u64 file_offset
,
1754 struct list_head
*list
)
1756 struct btrfs_ordered_sum
*sum
;
1758 list_for_each_entry(sum
, list
, list
) {
1759 trans
->adding_csums
= 1;
1760 btrfs_csum_file_blocks(trans
,
1761 BTRFS_I(inode
)->root
->fs_info
->csum_root
, sum
);
1762 trans
->adding_csums
= 0;
1767 int btrfs_set_extent_delalloc(struct inode
*inode
, u64 start
, u64 end
,
1768 struct extent_state
**cached_state
)
1770 WARN_ON((end
& (PAGE_CACHE_SIZE
- 1)) == 0);
1771 return set_extent_delalloc(&BTRFS_I(inode
)->io_tree
, start
, end
,
1772 cached_state
, GFP_NOFS
);
1775 /* see btrfs_writepage_start_hook for details on why this is required */
1776 struct btrfs_writepage_fixup
{
1778 struct btrfs_work work
;
1781 static void btrfs_writepage_fixup_worker(struct btrfs_work
*work
)
1783 struct btrfs_writepage_fixup
*fixup
;
1784 struct btrfs_ordered_extent
*ordered
;
1785 struct extent_state
*cached_state
= NULL
;
1787 struct inode
*inode
;
1792 fixup
= container_of(work
, struct btrfs_writepage_fixup
, work
);
1796 if (!page
->mapping
|| !PageDirty(page
) || !PageChecked(page
)) {
1797 ClearPageChecked(page
);
1801 inode
= page
->mapping
->host
;
1802 page_start
= page_offset(page
);
1803 page_end
= page_offset(page
) + PAGE_CACHE_SIZE
- 1;
1805 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
, 0,
1808 /* already ordered? We're done */
1809 if (PagePrivate2(page
))
1812 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
1814 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, page_start
,
1815 page_end
, &cached_state
, GFP_NOFS
);
1817 btrfs_start_ordered_extent(inode
, ordered
, 1);
1818 btrfs_put_ordered_extent(ordered
);
1822 ret
= btrfs_delalloc_reserve_space(inode
, PAGE_CACHE_SIZE
);
1824 mapping_set_error(page
->mapping
, ret
);
1825 end_extent_writepage(page
, ret
, page_start
, page_end
);
1826 ClearPageChecked(page
);
1830 btrfs_set_extent_delalloc(inode
, page_start
, page_end
, &cached_state
);
1831 ClearPageChecked(page
);
1832 set_page_dirty(page
);
1834 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
,
1835 &cached_state
, GFP_NOFS
);
1838 page_cache_release(page
);
1843 * There are a few paths in the higher layers of the kernel that directly
1844 * set the page dirty bit without asking the filesystem if it is a
1845 * good idea. This causes problems because we want to make sure COW
1846 * properly happens and the data=ordered rules are followed.
1848 * In our case any range that doesn't have the ORDERED bit set
1849 * hasn't been properly setup for IO. We kick off an async process
1850 * to fix it up. The async helper will wait for ordered extents, set
1851 * the delalloc bit and make it safe to write the page.
1853 static int btrfs_writepage_start_hook(struct page
*page
, u64 start
, u64 end
)
1855 struct inode
*inode
= page
->mapping
->host
;
1856 struct btrfs_writepage_fixup
*fixup
;
1857 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1859 /* this page is properly in the ordered list */
1860 if (TestClearPagePrivate2(page
))
1863 if (PageChecked(page
))
1866 fixup
= kzalloc(sizeof(*fixup
), GFP_NOFS
);
1870 SetPageChecked(page
);
1871 page_cache_get(page
);
1872 btrfs_init_work(&fixup
->work
, btrfs_writepage_fixup_worker
, NULL
, NULL
);
1874 btrfs_queue_work(root
->fs_info
->fixup_workers
, &fixup
->work
);
1878 static int insert_reserved_file_extent(struct btrfs_trans_handle
*trans
,
1879 struct inode
*inode
, u64 file_pos
,
1880 u64 disk_bytenr
, u64 disk_num_bytes
,
1881 u64 num_bytes
, u64 ram_bytes
,
1882 u8 compression
, u8 encryption
,
1883 u16 other_encoding
, int extent_type
)
1885 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1886 struct btrfs_file_extent_item
*fi
;
1887 struct btrfs_path
*path
;
1888 struct extent_buffer
*leaf
;
1889 struct btrfs_key ins
;
1890 int extent_inserted
= 0;
1893 path
= btrfs_alloc_path();
1898 * we may be replacing one extent in the tree with another.
1899 * The new extent is pinned in the extent map, and we don't want
1900 * to drop it from the cache until it is completely in the btree.
1902 * So, tell btrfs_drop_extents to leave this extent in the cache.
1903 * the caller is expected to unpin it and allow it to be merged
1906 ret
= __btrfs_drop_extents(trans
, root
, inode
, path
, file_pos
,
1907 file_pos
+ num_bytes
, NULL
, 0,
1908 1, sizeof(*fi
), &extent_inserted
);
1912 if (!extent_inserted
) {
1913 ins
.objectid
= btrfs_ino(inode
);
1914 ins
.offset
= file_pos
;
1915 ins
.type
= BTRFS_EXTENT_DATA_KEY
;
1917 path
->leave_spinning
= 1;
1918 ret
= btrfs_insert_empty_item(trans
, root
, path
, &ins
,
1923 leaf
= path
->nodes
[0];
1924 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
1925 struct btrfs_file_extent_item
);
1926 btrfs_set_file_extent_generation(leaf
, fi
, trans
->transid
);
1927 btrfs_set_file_extent_type(leaf
, fi
, extent_type
);
1928 btrfs_set_file_extent_disk_bytenr(leaf
, fi
, disk_bytenr
);
1929 btrfs_set_file_extent_disk_num_bytes(leaf
, fi
, disk_num_bytes
);
1930 btrfs_set_file_extent_offset(leaf
, fi
, 0);
1931 btrfs_set_file_extent_num_bytes(leaf
, fi
, num_bytes
);
1932 btrfs_set_file_extent_ram_bytes(leaf
, fi
, ram_bytes
);
1933 btrfs_set_file_extent_compression(leaf
, fi
, compression
);
1934 btrfs_set_file_extent_encryption(leaf
, fi
, encryption
);
1935 btrfs_set_file_extent_other_encoding(leaf
, fi
, other_encoding
);
1937 btrfs_mark_buffer_dirty(leaf
);
1938 btrfs_release_path(path
);
1940 inode_add_bytes(inode
, num_bytes
);
1942 ins
.objectid
= disk_bytenr
;
1943 ins
.offset
= disk_num_bytes
;
1944 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
1945 ret
= btrfs_alloc_reserved_file_extent(trans
, root
,
1946 root
->root_key
.objectid
,
1947 btrfs_ino(inode
), file_pos
, &ins
);
1949 btrfs_free_path(path
);
1954 /* snapshot-aware defrag */
1955 struct sa_defrag_extent_backref
{
1956 struct rb_node node
;
1957 struct old_sa_defrag_extent
*old
;
1966 struct old_sa_defrag_extent
{
1967 struct list_head list
;
1968 struct new_sa_defrag_extent
*new;
1977 struct new_sa_defrag_extent
{
1978 struct rb_root root
;
1979 struct list_head head
;
1980 struct btrfs_path
*path
;
1981 struct inode
*inode
;
1989 static int backref_comp(struct sa_defrag_extent_backref
*b1
,
1990 struct sa_defrag_extent_backref
*b2
)
1992 if (b1
->root_id
< b2
->root_id
)
1994 else if (b1
->root_id
> b2
->root_id
)
1997 if (b1
->inum
< b2
->inum
)
1999 else if (b1
->inum
> b2
->inum
)
2002 if (b1
->file_pos
< b2
->file_pos
)
2004 else if (b1
->file_pos
> b2
->file_pos
)
2008 * [------------------------------] ===> (a range of space)
2009 * |<--->| |<---->| =============> (fs/file tree A)
2010 * |<---------------------------->| ===> (fs/file tree B)
2012 * A range of space can refer to two file extents in one tree while
2013 * refer to only one file extent in another tree.
2015 * So we may process a disk offset more than one time(two extents in A)
2016 * and locate at the same extent(one extent in B), then insert two same
2017 * backrefs(both refer to the extent in B).
2022 static void backref_insert(struct rb_root
*root
,
2023 struct sa_defrag_extent_backref
*backref
)
2025 struct rb_node
**p
= &root
->rb_node
;
2026 struct rb_node
*parent
= NULL
;
2027 struct sa_defrag_extent_backref
*entry
;
2032 entry
= rb_entry(parent
, struct sa_defrag_extent_backref
, node
);
2034 ret
= backref_comp(backref
, entry
);
2038 p
= &(*p
)->rb_right
;
2041 rb_link_node(&backref
->node
, parent
, p
);
2042 rb_insert_color(&backref
->node
, root
);
2046 * Note the backref might has changed, and in this case we just return 0.
2048 static noinline
int record_one_backref(u64 inum
, u64 offset
, u64 root_id
,
2051 struct btrfs_file_extent_item
*extent
;
2052 struct btrfs_fs_info
*fs_info
;
2053 struct old_sa_defrag_extent
*old
= ctx
;
2054 struct new_sa_defrag_extent
*new = old
->new;
2055 struct btrfs_path
*path
= new->path
;
2056 struct btrfs_key key
;
2057 struct btrfs_root
*root
;
2058 struct sa_defrag_extent_backref
*backref
;
2059 struct extent_buffer
*leaf
;
2060 struct inode
*inode
= new->inode
;
2066 if (BTRFS_I(inode
)->root
->root_key
.objectid
== root_id
&&
2067 inum
== btrfs_ino(inode
))
2070 key
.objectid
= root_id
;
2071 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2072 key
.offset
= (u64
)-1;
2074 fs_info
= BTRFS_I(inode
)->root
->fs_info
;
2075 root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
2077 if (PTR_ERR(root
) == -ENOENT
)
2080 pr_debug("inum=%llu, offset=%llu, root_id=%llu\n",
2081 inum
, offset
, root_id
);
2082 return PTR_ERR(root
);
2085 key
.objectid
= inum
;
2086 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2087 if (offset
> (u64
)-1 << 32)
2090 key
.offset
= offset
;
2092 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2093 if (WARN_ON(ret
< 0))
2100 leaf
= path
->nodes
[0];
2101 slot
= path
->slots
[0];
2103 if (slot
>= btrfs_header_nritems(leaf
)) {
2104 ret
= btrfs_next_leaf(root
, path
);
2107 } else if (ret
> 0) {
2116 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
2118 if (key
.objectid
> inum
)
2121 if (key
.objectid
< inum
|| key
.type
!= BTRFS_EXTENT_DATA_KEY
)
2124 extent
= btrfs_item_ptr(leaf
, slot
,
2125 struct btrfs_file_extent_item
);
2127 if (btrfs_file_extent_disk_bytenr(leaf
, extent
) != old
->bytenr
)
2131 * 'offset' refers to the exact key.offset,
2132 * NOT the 'offset' field in btrfs_extent_data_ref, ie.
2133 * (key.offset - extent_offset).
2135 if (key
.offset
!= offset
)
2138 extent_offset
= btrfs_file_extent_offset(leaf
, extent
);
2139 num_bytes
= btrfs_file_extent_num_bytes(leaf
, extent
);
2141 if (extent_offset
>= old
->extent_offset
+ old
->offset
+
2142 old
->len
|| extent_offset
+ num_bytes
<=
2143 old
->extent_offset
+ old
->offset
)
2148 backref
= kmalloc(sizeof(*backref
), GFP_NOFS
);
2154 backref
->root_id
= root_id
;
2155 backref
->inum
= inum
;
2156 backref
->file_pos
= offset
;
2157 backref
->num_bytes
= num_bytes
;
2158 backref
->extent_offset
= extent_offset
;
2159 backref
->generation
= btrfs_file_extent_generation(leaf
, extent
);
2161 backref_insert(&new->root
, backref
);
2164 btrfs_release_path(path
);
2169 static noinline
bool record_extent_backrefs(struct btrfs_path
*path
,
2170 struct new_sa_defrag_extent
*new)
2172 struct btrfs_fs_info
*fs_info
= BTRFS_I(new->inode
)->root
->fs_info
;
2173 struct old_sa_defrag_extent
*old
, *tmp
;
2178 list_for_each_entry_safe(old
, tmp
, &new->head
, list
) {
2179 ret
= iterate_inodes_from_logical(old
->bytenr
+
2180 old
->extent_offset
, fs_info
,
2181 path
, record_one_backref
,
2183 if (ret
< 0 && ret
!= -ENOENT
)
2186 /* no backref to be processed for this extent */
2188 list_del(&old
->list
);
2193 if (list_empty(&new->head
))
2199 static int relink_is_mergable(struct extent_buffer
*leaf
,
2200 struct btrfs_file_extent_item
*fi
,
2201 struct new_sa_defrag_extent
*new)
2203 if (btrfs_file_extent_disk_bytenr(leaf
, fi
) != new->bytenr
)
2206 if (btrfs_file_extent_type(leaf
, fi
) != BTRFS_FILE_EXTENT_REG
)
2209 if (btrfs_file_extent_compression(leaf
, fi
) != new->compress_type
)
2212 if (btrfs_file_extent_encryption(leaf
, fi
) ||
2213 btrfs_file_extent_other_encoding(leaf
, fi
))
2220 * Note the backref might has changed, and in this case we just return 0.
2222 static noinline
int relink_extent_backref(struct btrfs_path
*path
,
2223 struct sa_defrag_extent_backref
*prev
,
2224 struct sa_defrag_extent_backref
*backref
)
2226 struct btrfs_file_extent_item
*extent
;
2227 struct btrfs_file_extent_item
*item
;
2228 struct btrfs_ordered_extent
*ordered
;
2229 struct btrfs_trans_handle
*trans
;
2230 struct btrfs_fs_info
*fs_info
;
2231 struct btrfs_root
*root
;
2232 struct btrfs_key key
;
2233 struct extent_buffer
*leaf
;
2234 struct old_sa_defrag_extent
*old
= backref
->old
;
2235 struct new_sa_defrag_extent
*new = old
->new;
2236 struct inode
*src_inode
= new->inode
;
2237 struct inode
*inode
;
2238 struct extent_state
*cached
= NULL
;
2247 if (prev
&& prev
->root_id
== backref
->root_id
&&
2248 prev
->inum
== backref
->inum
&&
2249 prev
->file_pos
+ prev
->num_bytes
== backref
->file_pos
)
2252 /* step 1: get root */
2253 key
.objectid
= backref
->root_id
;
2254 key
.type
= BTRFS_ROOT_ITEM_KEY
;
2255 key
.offset
= (u64
)-1;
2257 fs_info
= BTRFS_I(src_inode
)->root
->fs_info
;
2258 index
= srcu_read_lock(&fs_info
->subvol_srcu
);
2260 root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
2262 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
2263 if (PTR_ERR(root
) == -ENOENT
)
2265 return PTR_ERR(root
);
2268 if (btrfs_root_readonly(root
)) {
2269 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
2273 /* step 2: get inode */
2274 key
.objectid
= backref
->inum
;
2275 key
.type
= BTRFS_INODE_ITEM_KEY
;
2278 inode
= btrfs_iget(fs_info
->sb
, &key
, root
, NULL
);
2279 if (IS_ERR(inode
)) {
2280 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
2284 srcu_read_unlock(&fs_info
->subvol_srcu
, index
);
2286 /* step 3: relink backref */
2287 lock_start
= backref
->file_pos
;
2288 lock_end
= backref
->file_pos
+ backref
->num_bytes
- 1;
2289 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, lock_start
, lock_end
,
2292 ordered
= btrfs_lookup_first_ordered_extent(inode
, lock_end
);
2294 btrfs_put_ordered_extent(ordered
);
2298 trans
= btrfs_join_transaction(root
);
2299 if (IS_ERR(trans
)) {
2300 ret
= PTR_ERR(trans
);
2304 key
.objectid
= backref
->inum
;
2305 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2306 key
.offset
= backref
->file_pos
;
2308 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2311 } else if (ret
> 0) {
2316 extent
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
2317 struct btrfs_file_extent_item
);
2319 if (btrfs_file_extent_generation(path
->nodes
[0], extent
) !=
2320 backref
->generation
)
2323 btrfs_release_path(path
);
2325 start
= backref
->file_pos
;
2326 if (backref
->extent_offset
< old
->extent_offset
+ old
->offset
)
2327 start
+= old
->extent_offset
+ old
->offset
-
2328 backref
->extent_offset
;
2330 len
= min(backref
->extent_offset
+ backref
->num_bytes
,
2331 old
->extent_offset
+ old
->offset
+ old
->len
);
2332 len
-= max(backref
->extent_offset
, old
->extent_offset
+ old
->offset
);
2334 ret
= btrfs_drop_extents(trans
, root
, inode
, start
,
2339 key
.objectid
= btrfs_ino(inode
);
2340 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2343 path
->leave_spinning
= 1;
2345 struct btrfs_file_extent_item
*fi
;
2347 struct btrfs_key found_key
;
2349 ret
= btrfs_search_slot(trans
, root
, &key
, path
, 0, 1);
2354 leaf
= path
->nodes
[0];
2355 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
2357 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
2358 struct btrfs_file_extent_item
);
2359 extent_len
= btrfs_file_extent_num_bytes(leaf
, fi
);
2361 if (extent_len
+ found_key
.offset
== start
&&
2362 relink_is_mergable(leaf
, fi
, new)) {
2363 btrfs_set_file_extent_num_bytes(leaf
, fi
,
2365 btrfs_mark_buffer_dirty(leaf
);
2366 inode_add_bytes(inode
, len
);
2372 btrfs_release_path(path
);
2377 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2380 btrfs_abort_transaction(trans
, root
, ret
);
2384 leaf
= path
->nodes
[0];
2385 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
2386 struct btrfs_file_extent_item
);
2387 btrfs_set_file_extent_disk_bytenr(leaf
, item
, new->bytenr
);
2388 btrfs_set_file_extent_disk_num_bytes(leaf
, item
, new->disk_len
);
2389 btrfs_set_file_extent_offset(leaf
, item
, start
- new->file_pos
);
2390 btrfs_set_file_extent_num_bytes(leaf
, item
, len
);
2391 btrfs_set_file_extent_ram_bytes(leaf
, item
, new->len
);
2392 btrfs_set_file_extent_generation(leaf
, item
, trans
->transid
);
2393 btrfs_set_file_extent_type(leaf
, item
, BTRFS_FILE_EXTENT_REG
);
2394 btrfs_set_file_extent_compression(leaf
, item
, new->compress_type
);
2395 btrfs_set_file_extent_encryption(leaf
, item
, 0);
2396 btrfs_set_file_extent_other_encoding(leaf
, item
, 0);
2398 btrfs_mark_buffer_dirty(leaf
);
2399 inode_add_bytes(inode
, len
);
2400 btrfs_release_path(path
);
2402 ret
= btrfs_inc_extent_ref(trans
, root
, new->bytenr
,
2404 backref
->root_id
, backref
->inum
,
2405 new->file_pos
, 0); /* start - extent_offset */
2407 btrfs_abort_transaction(trans
, root
, ret
);
2413 btrfs_release_path(path
);
2414 path
->leave_spinning
= 0;
2415 btrfs_end_transaction(trans
, root
);
2417 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, lock_start
, lock_end
,
2423 static void free_sa_defrag_extent(struct new_sa_defrag_extent
*new)
2425 struct old_sa_defrag_extent
*old
, *tmp
;
2430 list_for_each_entry_safe(old
, tmp
, &new->head
, list
) {
2431 list_del(&old
->list
);
2437 static void relink_file_extents(struct new_sa_defrag_extent
*new)
2439 struct btrfs_path
*path
;
2440 struct sa_defrag_extent_backref
*backref
;
2441 struct sa_defrag_extent_backref
*prev
= NULL
;
2442 struct inode
*inode
;
2443 struct btrfs_root
*root
;
2444 struct rb_node
*node
;
2448 root
= BTRFS_I(inode
)->root
;
2450 path
= btrfs_alloc_path();
2454 if (!record_extent_backrefs(path
, new)) {
2455 btrfs_free_path(path
);
2458 btrfs_release_path(path
);
2461 node
= rb_first(&new->root
);
2464 rb_erase(node
, &new->root
);
2466 backref
= rb_entry(node
, struct sa_defrag_extent_backref
, node
);
2468 ret
= relink_extent_backref(path
, prev
, backref
);
2481 btrfs_free_path(path
);
2483 free_sa_defrag_extent(new);
2485 atomic_dec(&root
->fs_info
->defrag_running
);
2486 wake_up(&root
->fs_info
->transaction_wait
);
2489 static struct new_sa_defrag_extent
*
2490 record_old_file_extents(struct inode
*inode
,
2491 struct btrfs_ordered_extent
*ordered
)
2493 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2494 struct btrfs_path
*path
;
2495 struct btrfs_key key
;
2496 struct old_sa_defrag_extent
*old
;
2497 struct new_sa_defrag_extent
*new;
2500 new = kmalloc(sizeof(*new), GFP_NOFS
);
2505 new->file_pos
= ordered
->file_offset
;
2506 new->len
= ordered
->len
;
2507 new->bytenr
= ordered
->start
;
2508 new->disk_len
= ordered
->disk_len
;
2509 new->compress_type
= ordered
->compress_type
;
2510 new->root
= RB_ROOT
;
2511 INIT_LIST_HEAD(&new->head
);
2513 path
= btrfs_alloc_path();
2517 key
.objectid
= btrfs_ino(inode
);
2518 key
.type
= BTRFS_EXTENT_DATA_KEY
;
2519 key
.offset
= new->file_pos
;
2521 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2524 if (ret
> 0 && path
->slots
[0] > 0)
2527 /* find out all the old extents for the file range */
2529 struct btrfs_file_extent_item
*extent
;
2530 struct extent_buffer
*l
;
2539 slot
= path
->slots
[0];
2541 if (slot
>= btrfs_header_nritems(l
)) {
2542 ret
= btrfs_next_leaf(root
, path
);
2550 btrfs_item_key_to_cpu(l
, &key
, slot
);
2552 if (key
.objectid
!= btrfs_ino(inode
))
2554 if (key
.type
!= BTRFS_EXTENT_DATA_KEY
)
2556 if (key
.offset
>= new->file_pos
+ new->len
)
2559 extent
= btrfs_item_ptr(l
, slot
, struct btrfs_file_extent_item
);
2561 num_bytes
= btrfs_file_extent_num_bytes(l
, extent
);
2562 if (key
.offset
+ num_bytes
< new->file_pos
)
2565 disk_bytenr
= btrfs_file_extent_disk_bytenr(l
, extent
);
2569 extent_offset
= btrfs_file_extent_offset(l
, extent
);
2571 old
= kmalloc(sizeof(*old
), GFP_NOFS
);
2575 offset
= max(new->file_pos
, key
.offset
);
2576 end
= min(new->file_pos
+ new->len
, key
.offset
+ num_bytes
);
2578 old
->bytenr
= disk_bytenr
;
2579 old
->extent_offset
= extent_offset
;
2580 old
->offset
= offset
- key
.offset
;
2581 old
->len
= end
- offset
;
2584 list_add_tail(&old
->list
, &new->head
);
2590 btrfs_free_path(path
);
2591 atomic_inc(&root
->fs_info
->defrag_running
);
2596 btrfs_free_path(path
);
2598 free_sa_defrag_extent(new);
2602 /* as ordered data IO finishes, this gets called so we can finish
2603 * an ordered extent if the range of bytes in the file it covers are
2606 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent
*ordered_extent
)
2608 struct inode
*inode
= ordered_extent
->inode
;
2609 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2610 struct btrfs_trans_handle
*trans
= NULL
;
2611 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2612 struct extent_state
*cached_state
= NULL
;
2613 struct new_sa_defrag_extent
*new = NULL
;
2614 int compress_type
= 0;
2616 u64 logical_len
= ordered_extent
->len
;
2618 bool truncated
= false;
2620 nolock
= btrfs_is_free_space_inode(inode
);
2622 if (test_bit(BTRFS_ORDERED_IOERR
, &ordered_extent
->flags
)) {
2627 if (test_bit(BTRFS_ORDERED_TRUNCATED
, &ordered_extent
->flags
)) {
2629 logical_len
= ordered_extent
->truncated_len
;
2630 /* Truncated the entire extent, don't bother adding */
2635 if (test_bit(BTRFS_ORDERED_NOCOW
, &ordered_extent
->flags
)) {
2636 BUG_ON(!list_empty(&ordered_extent
->list
)); /* Logic error */
2637 btrfs_ordered_update_i_size(inode
, 0, ordered_extent
);
2639 trans
= btrfs_join_transaction_nolock(root
);
2641 trans
= btrfs_join_transaction(root
);
2642 if (IS_ERR(trans
)) {
2643 ret
= PTR_ERR(trans
);
2647 trans
->block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
2648 ret
= btrfs_update_inode_fallback(trans
, root
, inode
);
2649 if (ret
) /* -ENOMEM or corruption */
2650 btrfs_abort_transaction(trans
, root
, ret
);
2654 lock_extent_bits(io_tree
, ordered_extent
->file_offset
,
2655 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
2658 ret
= test_range_bit(io_tree
, ordered_extent
->file_offset
,
2659 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
2660 EXTENT_DEFRAG
, 1, cached_state
);
2662 u64 last_snapshot
= btrfs_root_last_snapshot(&root
->root_item
);
2663 if (0 && last_snapshot
>= BTRFS_I(inode
)->generation
)
2664 /* the inode is shared */
2665 new = record_old_file_extents(inode
, ordered_extent
);
2667 clear_extent_bit(io_tree
, ordered_extent
->file_offset
,
2668 ordered_extent
->file_offset
+ ordered_extent
->len
- 1,
2669 EXTENT_DEFRAG
, 0, 0, &cached_state
, GFP_NOFS
);
2673 trans
= btrfs_join_transaction_nolock(root
);
2675 trans
= btrfs_join_transaction(root
);
2676 if (IS_ERR(trans
)) {
2677 ret
= PTR_ERR(trans
);
2681 trans
->block_rsv
= &root
->fs_info
->delalloc_block_rsv
;
2683 if (test_bit(BTRFS_ORDERED_COMPRESSED
, &ordered_extent
->flags
))
2684 compress_type
= ordered_extent
->compress_type
;
2685 if (test_bit(BTRFS_ORDERED_PREALLOC
, &ordered_extent
->flags
)) {
2686 BUG_ON(compress_type
);
2687 ret
= btrfs_mark_extent_written(trans
, inode
,
2688 ordered_extent
->file_offset
,
2689 ordered_extent
->file_offset
+
2692 BUG_ON(root
== root
->fs_info
->tree_root
);
2693 ret
= insert_reserved_file_extent(trans
, inode
,
2694 ordered_extent
->file_offset
,
2695 ordered_extent
->start
,
2696 ordered_extent
->disk_len
,
2697 logical_len
, logical_len
,
2698 compress_type
, 0, 0,
2699 BTRFS_FILE_EXTENT_REG
);
2701 unpin_extent_cache(&BTRFS_I(inode
)->extent_tree
,
2702 ordered_extent
->file_offset
, ordered_extent
->len
,
2705 btrfs_abort_transaction(trans
, root
, ret
);
2709 add_pending_csums(trans
, inode
, ordered_extent
->file_offset
,
2710 &ordered_extent
->list
);
2712 btrfs_ordered_update_i_size(inode
, 0, ordered_extent
);
2713 ret
= btrfs_update_inode_fallback(trans
, root
, inode
);
2714 if (ret
) { /* -ENOMEM or corruption */
2715 btrfs_abort_transaction(trans
, root
, ret
);
2720 unlock_extent_cached(io_tree
, ordered_extent
->file_offset
,
2721 ordered_extent
->file_offset
+
2722 ordered_extent
->len
- 1, &cached_state
, GFP_NOFS
);
2724 if (root
!= root
->fs_info
->tree_root
)
2725 btrfs_delalloc_release_metadata(inode
, ordered_extent
->len
);
2727 btrfs_end_transaction(trans
, root
);
2729 if (ret
|| truncated
) {
2733 start
= ordered_extent
->file_offset
+ logical_len
;
2735 start
= ordered_extent
->file_offset
;
2736 end
= ordered_extent
->file_offset
+ ordered_extent
->len
- 1;
2737 clear_extent_uptodate(io_tree
, start
, end
, NULL
, GFP_NOFS
);
2739 /* Drop the cache for the part of the extent we didn't write. */
2740 btrfs_drop_extent_cache(inode
, start
, end
, 0);
2743 * If the ordered extent had an IOERR or something else went
2744 * wrong we need to return the space for this ordered extent
2745 * back to the allocator. We only free the extent in the
2746 * truncated case if we didn't write out the extent at all.
2748 if ((ret
|| !logical_len
) &&
2749 !test_bit(BTRFS_ORDERED_NOCOW
, &ordered_extent
->flags
) &&
2750 !test_bit(BTRFS_ORDERED_PREALLOC
, &ordered_extent
->flags
))
2751 btrfs_free_reserved_extent(root
, ordered_extent
->start
,
2752 ordered_extent
->disk_len
);
2757 * This needs to be done to make sure anybody waiting knows we are done
2758 * updating everything for this ordered extent.
2760 btrfs_remove_ordered_extent(inode
, ordered_extent
);
2762 /* for snapshot-aware defrag */
2765 free_sa_defrag_extent(new);
2766 atomic_dec(&root
->fs_info
->defrag_running
);
2768 relink_file_extents(new);
2773 btrfs_put_ordered_extent(ordered_extent
);
2774 /* once for the tree */
2775 btrfs_put_ordered_extent(ordered_extent
);
2780 static void finish_ordered_fn(struct btrfs_work
*work
)
2782 struct btrfs_ordered_extent
*ordered_extent
;
2783 ordered_extent
= container_of(work
, struct btrfs_ordered_extent
, work
);
2784 btrfs_finish_ordered_io(ordered_extent
);
2787 static int btrfs_writepage_end_io_hook(struct page
*page
, u64 start
, u64 end
,
2788 struct extent_state
*state
, int uptodate
)
2790 struct inode
*inode
= page
->mapping
->host
;
2791 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2792 struct btrfs_ordered_extent
*ordered_extent
= NULL
;
2793 struct btrfs_workqueue
*workers
;
2795 trace_btrfs_writepage_end_io_hook(page
, start
, end
, uptodate
);
2797 ClearPagePrivate2(page
);
2798 if (!btrfs_dec_test_ordered_pending(inode
, &ordered_extent
, start
,
2799 end
- start
+ 1, uptodate
))
2802 btrfs_init_work(&ordered_extent
->work
, finish_ordered_fn
, NULL
, NULL
);
2804 if (btrfs_is_free_space_inode(inode
))
2805 workers
= root
->fs_info
->endio_freespace_worker
;
2807 workers
= root
->fs_info
->endio_write_workers
;
2808 btrfs_queue_work(workers
, &ordered_extent
->work
);
2814 * when reads are done, we need to check csums to verify the data is correct
2815 * if there's a match, we allow the bio to finish. If not, the code in
2816 * extent_io.c will try to find good copies for us.
2818 static int btrfs_readpage_end_io_hook(struct btrfs_io_bio
*io_bio
,
2819 u64 phy_offset
, struct page
*page
,
2820 u64 start
, u64 end
, int mirror
)
2822 size_t offset
= start
- page_offset(page
);
2823 struct inode
*inode
= page
->mapping
->host
;
2824 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2826 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2829 static DEFINE_RATELIMIT_STATE(_rs
, DEFAULT_RATELIMIT_INTERVAL
,
2830 DEFAULT_RATELIMIT_BURST
);
2832 if (PageChecked(page
)) {
2833 ClearPageChecked(page
);
2837 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
)
2840 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
&&
2841 test_range_bit(io_tree
, start
, end
, EXTENT_NODATASUM
, 1, NULL
)) {
2842 clear_extent_bits(io_tree
, start
, end
, EXTENT_NODATASUM
,
2847 phy_offset
>>= inode
->i_sb
->s_blocksize_bits
;
2848 csum_expected
= *(((u32
*)io_bio
->csum
) + phy_offset
);
2850 kaddr
= kmap_atomic(page
);
2851 csum
= btrfs_csum_data(kaddr
+ offset
, csum
, end
- start
+ 1);
2852 btrfs_csum_final(csum
, (char *)&csum
);
2853 if (csum
!= csum_expected
)
2856 kunmap_atomic(kaddr
);
2861 if (__ratelimit(&_rs
))
2862 btrfs_info(root
->fs_info
, "csum failed ino %llu off %llu csum %u expected csum %u",
2863 btrfs_ino(page
->mapping
->host
), start
, csum
, csum_expected
);
2864 memset(kaddr
+ offset
, 1, end
- start
+ 1);
2865 flush_dcache_page(page
);
2866 kunmap_atomic(kaddr
);
2867 if (csum_expected
== 0)
2872 struct delayed_iput
{
2873 struct list_head list
;
2874 struct inode
*inode
;
2877 /* JDM: If this is fs-wide, why can't we add a pointer to
2878 * btrfs_inode instead and avoid the allocation? */
2879 void btrfs_add_delayed_iput(struct inode
*inode
)
2881 struct btrfs_fs_info
*fs_info
= BTRFS_I(inode
)->root
->fs_info
;
2882 struct delayed_iput
*delayed
;
2884 if (atomic_add_unless(&inode
->i_count
, -1, 1))
2887 delayed
= kmalloc(sizeof(*delayed
), GFP_NOFS
| __GFP_NOFAIL
);
2888 delayed
->inode
= inode
;
2890 spin_lock(&fs_info
->delayed_iput_lock
);
2891 list_add_tail(&delayed
->list
, &fs_info
->delayed_iputs
);
2892 spin_unlock(&fs_info
->delayed_iput_lock
);
2895 void btrfs_run_delayed_iputs(struct btrfs_root
*root
)
2898 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2899 struct delayed_iput
*delayed
;
2902 spin_lock(&fs_info
->delayed_iput_lock
);
2903 empty
= list_empty(&fs_info
->delayed_iputs
);
2904 spin_unlock(&fs_info
->delayed_iput_lock
);
2908 spin_lock(&fs_info
->delayed_iput_lock
);
2909 list_splice_init(&fs_info
->delayed_iputs
, &list
);
2910 spin_unlock(&fs_info
->delayed_iput_lock
);
2912 while (!list_empty(&list
)) {
2913 delayed
= list_entry(list
.next
, struct delayed_iput
, list
);
2914 list_del(&delayed
->list
);
2915 iput(delayed
->inode
);
2921 * This is called in transaction commit time. If there are no orphan
2922 * files in the subvolume, it removes orphan item and frees block_rsv
2925 void btrfs_orphan_commit_root(struct btrfs_trans_handle
*trans
,
2926 struct btrfs_root
*root
)
2928 struct btrfs_block_rsv
*block_rsv
;
2931 if (atomic_read(&root
->orphan_inodes
) ||
2932 root
->orphan_cleanup_state
!= ORPHAN_CLEANUP_DONE
)
2935 spin_lock(&root
->orphan_lock
);
2936 if (atomic_read(&root
->orphan_inodes
)) {
2937 spin_unlock(&root
->orphan_lock
);
2941 if (root
->orphan_cleanup_state
!= ORPHAN_CLEANUP_DONE
) {
2942 spin_unlock(&root
->orphan_lock
);
2946 block_rsv
= root
->orphan_block_rsv
;
2947 root
->orphan_block_rsv
= NULL
;
2948 spin_unlock(&root
->orphan_lock
);
2950 if (test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &root
->state
) &&
2951 btrfs_root_refs(&root
->root_item
) > 0) {
2952 ret
= btrfs_del_orphan_item(trans
, root
->fs_info
->tree_root
,
2953 root
->root_key
.objectid
);
2955 btrfs_abort_transaction(trans
, root
, ret
);
2957 clear_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
,
2962 WARN_ON(block_rsv
->size
> 0);
2963 btrfs_free_block_rsv(root
, block_rsv
);
2968 * This creates an orphan entry for the given inode in case something goes
2969 * wrong in the middle of an unlink/truncate.
2971 * NOTE: caller of this function should reserve 5 units of metadata for
2974 int btrfs_orphan_add(struct btrfs_trans_handle
*trans
, struct inode
*inode
)
2976 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2977 struct btrfs_block_rsv
*block_rsv
= NULL
;
2982 if (!root
->orphan_block_rsv
) {
2983 block_rsv
= btrfs_alloc_block_rsv(root
, BTRFS_BLOCK_RSV_TEMP
);
2988 spin_lock(&root
->orphan_lock
);
2989 if (!root
->orphan_block_rsv
) {
2990 root
->orphan_block_rsv
= block_rsv
;
2991 } else if (block_rsv
) {
2992 btrfs_free_block_rsv(root
, block_rsv
);
2996 if (!test_and_set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
2997 &BTRFS_I(inode
)->runtime_flags
)) {
3000 * For proper ENOSPC handling, we should do orphan
3001 * cleanup when mounting. But this introduces backward
3002 * compatibility issue.
3004 if (!xchg(&root
->orphan_item_inserted
, 1))
3010 atomic_inc(&root
->orphan_inodes
);
3013 if (!test_and_set_bit(BTRFS_INODE_ORPHAN_META_RESERVED
,
3014 &BTRFS_I(inode
)->runtime_flags
))
3016 spin_unlock(&root
->orphan_lock
);
3018 /* grab metadata reservation from transaction handle */
3020 ret
= btrfs_orphan_reserve_metadata(trans
, inode
);
3021 BUG_ON(ret
); /* -ENOSPC in reservation; Logic error? JDM */
3024 /* insert an orphan item to track this unlinked/truncated file */
3026 ret
= btrfs_insert_orphan_item(trans
, root
, btrfs_ino(inode
));
3028 atomic_dec(&root
->orphan_inodes
);
3030 clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED
,
3031 &BTRFS_I(inode
)->runtime_flags
);
3032 btrfs_orphan_release_metadata(inode
);
3034 if (ret
!= -EEXIST
) {
3035 clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
3036 &BTRFS_I(inode
)->runtime_flags
);
3037 btrfs_abort_transaction(trans
, root
, ret
);
3044 /* insert an orphan item to track subvolume contains orphan files */
3046 ret
= btrfs_insert_orphan_item(trans
, root
->fs_info
->tree_root
,
3047 root
->root_key
.objectid
);
3048 if (ret
&& ret
!= -EEXIST
) {
3049 btrfs_abort_transaction(trans
, root
, ret
);
3057 * We have done the truncate/delete so we can go ahead and remove the orphan
3058 * item for this particular inode.
3060 static int btrfs_orphan_del(struct btrfs_trans_handle
*trans
,
3061 struct inode
*inode
)
3063 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3064 int delete_item
= 0;
3065 int release_rsv
= 0;
3068 spin_lock(&root
->orphan_lock
);
3069 if (test_and_clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
3070 &BTRFS_I(inode
)->runtime_flags
))
3073 if (test_and_clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED
,
3074 &BTRFS_I(inode
)->runtime_flags
))
3076 spin_unlock(&root
->orphan_lock
);
3079 atomic_dec(&root
->orphan_inodes
);
3081 ret
= btrfs_del_orphan_item(trans
, root
,
3086 btrfs_orphan_release_metadata(inode
);
3092 * this cleans up any orphans that may be left on the list from the last use
3095 int btrfs_orphan_cleanup(struct btrfs_root
*root
)
3097 struct btrfs_path
*path
;
3098 struct extent_buffer
*leaf
;
3099 struct btrfs_key key
, found_key
;
3100 struct btrfs_trans_handle
*trans
;
3101 struct inode
*inode
;
3102 u64 last_objectid
= 0;
3103 int ret
= 0, nr_unlink
= 0, nr_truncate
= 0;
3105 if (cmpxchg(&root
->orphan_cleanup_state
, 0, ORPHAN_CLEANUP_STARTED
))
3108 path
= btrfs_alloc_path();
3115 key
.objectid
= BTRFS_ORPHAN_OBJECTID
;
3116 btrfs_set_key_type(&key
, BTRFS_ORPHAN_ITEM_KEY
);
3117 key
.offset
= (u64
)-1;
3120 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3125 * if ret == 0 means we found what we were searching for, which
3126 * is weird, but possible, so only screw with path if we didn't
3127 * find the key and see if we have stuff that matches
3131 if (path
->slots
[0] == 0)
3136 /* pull out the item */
3137 leaf
= path
->nodes
[0];
3138 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3140 /* make sure the item matches what we want */
3141 if (found_key
.objectid
!= BTRFS_ORPHAN_OBJECTID
)
3143 if (btrfs_key_type(&found_key
) != BTRFS_ORPHAN_ITEM_KEY
)
3146 /* release the path since we're done with it */
3147 btrfs_release_path(path
);
3150 * this is where we are basically btrfs_lookup, without the
3151 * crossing root thing. we store the inode number in the
3152 * offset of the orphan item.
3155 if (found_key
.offset
== last_objectid
) {
3156 btrfs_err(root
->fs_info
,
3157 "Error removing orphan entry, stopping orphan cleanup");
3162 last_objectid
= found_key
.offset
;
3164 found_key
.objectid
= found_key
.offset
;
3165 found_key
.type
= BTRFS_INODE_ITEM_KEY
;
3166 found_key
.offset
= 0;
3167 inode
= btrfs_iget(root
->fs_info
->sb
, &found_key
, root
, NULL
);
3168 ret
= PTR_ERR_OR_ZERO(inode
);
3169 if (ret
&& ret
!= -ESTALE
)
3172 if (ret
== -ESTALE
&& root
== root
->fs_info
->tree_root
) {
3173 struct btrfs_root
*dead_root
;
3174 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3175 int is_dead_root
= 0;
3178 * this is an orphan in the tree root. Currently these
3179 * could come from 2 sources:
3180 * a) a snapshot deletion in progress
3181 * b) a free space cache inode
3182 * We need to distinguish those two, as the snapshot
3183 * orphan must not get deleted.
3184 * find_dead_roots already ran before us, so if this
3185 * is a snapshot deletion, we should find the root
3186 * in the dead_roots list
3188 spin_lock(&fs_info
->trans_lock
);
3189 list_for_each_entry(dead_root
, &fs_info
->dead_roots
,
3191 if (dead_root
->root_key
.objectid
==
3192 found_key
.objectid
) {
3197 spin_unlock(&fs_info
->trans_lock
);
3199 /* prevent this orphan from being found again */
3200 key
.offset
= found_key
.objectid
- 1;
3205 * Inode is already gone but the orphan item is still there,
3206 * kill the orphan item.
3208 if (ret
== -ESTALE
) {
3209 trans
= btrfs_start_transaction(root
, 1);
3210 if (IS_ERR(trans
)) {
3211 ret
= PTR_ERR(trans
);
3214 btrfs_debug(root
->fs_info
, "auto deleting %Lu",
3215 found_key
.objectid
);
3216 ret
= btrfs_del_orphan_item(trans
, root
,
3217 found_key
.objectid
);
3218 btrfs_end_transaction(trans
, root
);
3225 * add this inode to the orphan list so btrfs_orphan_del does
3226 * the proper thing when we hit it
3228 set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
3229 &BTRFS_I(inode
)->runtime_flags
);
3230 atomic_inc(&root
->orphan_inodes
);
3232 /* if we have links, this was a truncate, lets do that */
3233 if (inode
->i_nlink
) {
3234 if (WARN_ON(!S_ISREG(inode
->i_mode
))) {
3240 /* 1 for the orphan item deletion. */
3241 trans
= btrfs_start_transaction(root
, 1);
3242 if (IS_ERR(trans
)) {
3244 ret
= PTR_ERR(trans
);
3247 ret
= btrfs_orphan_add(trans
, inode
);
3248 btrfs_end_transaction(trans
, root
);
3254 ret
= btrfs_truncate(inode
);
3256 btrfs_orphan_del(NULL
, inode
);
3261 /* this will do delete_inode and everything for us */
3266 /* release the path since we're done with it */
3267 btrfs_release_path(path
);
3269 root
->orphan_cleanup_state
= ORPHAN_CLEANUP_DONE
;
3271 if (root
->orphan_block_rsv
)
3272 btrfs_block_rsv_release(root
, root
->orphan_block_rsv
,
3275 if (root
->orphan_block_rsv
||
3276 test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &root
->state
)) {
3277 trans
= btrfs_join_transaction(root
);
3279 btrfs_end_transaction(trans
, root
);
3283 btrfs_debug(root
->fs_info
, "unlinked %d orphans", nr_unlink
);
3285 btrfs_debug(root
->fs_info
, "truncated %d orphans", nr_truncate
);
3289 btrfs_crit(root
->fs_info
,
3290 "could not do orphan cleanup %d", ret
);
3291 btrfs_free_path(path
);
3296 * very simple check to peek ahead in the leaf looking for xattrs. If we
3297 * don't find any xattrs, we know there can't be any acls.
3299 * slot is the slot the inode is in, objectid is the objectid of the inode
3301 static noinline
int acls_after_inode_item(struct extent_buffer
*leaf
,
3302 int slot
, u64 objectid
,
3303 int *first_xattr_slot
)
3305 u32 nritems
= btrfs_header_nritems(leaf
);
3306 struct btrfs_key found_key
;
3307 static u64 xattr_access
= 0;
3308 static u64 xattr_default
= 0;
3311 if (!xattr_access
) {
3312 xattr_access
= btrfs_name_hash(POSIX_ACL_XATTR_ACCESS
,
3313 strlen(POSIX_ACL_XATTR_ACCESS
));
3314 xattr_default
= btrfs_name_hash(POSIX_ACL_XATTR_DEFAULT
,
3315 strlen(POSIX_ACL_XATTR_DEFAULT
));
3319 *first_xattr_slot
= -1;
3320 while (slot
< nritems
) {
3321 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
3323 /* we found a different objectid, there must not be acls */
3324 if (found_key
.objectid
!= objectid
)
3327 /* we found an xattr, assume we've got an acl */
3328 if (found_key
.type
== BTRFS_XATTR_ITEM_KEY
) {
3329 if (*first_xattr_slot
== -1)
3330 *first_xattr_slot
= slot
;
3331 if (found_key
.offset
== xattr_access
||
3332 found_key
.offset
== xattr_default
)
3337 * we found a key greater than an xattr key, there can't
3338 * be any acls later on
3340 if (found_key
.type
> BTRFS_XATTR_ITEM_KEY
)
3347 * it goes inode, inode backrefs, xattrs, extents,
3348 * so if there are a ton of hard links to an inode there can
3349 * be a lot of backrefs. Don't waste time searching too hard,
3350 * this is just an optimization
3355 /* we hit the end of the leaf before we found an xattr or
3356 * something larger than an xattr. We have to assume the inode
3359 if (*first_xattr_slot
== -1)
3360 *first_xattr_slot
= slot
;
3365 * read an inode from the btree into the in-memory inode
3367 static void btrfs_read_locked_inode(struct inode
*inode
)
3369 struct btrfs_path
*path
;
3370 struct extent_buffer
*leaf
;
3371 struct btrfs_inode_item
*inode_item
;
3372 struct btrfs_timespec
*tspec
;
3373 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3374 struct btrfs_key location
;
3379 bool filled
= false;
3380 int first_xattr_slot
;
3382 ret
= btrfs_fill_inode(inode
, &rdev
);
3386 path
= btrfs_alloc_path();
3390 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
3392 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
3396 leaf
= path
->nodes
[0];
3401 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
3402 struct btrfs_inode_item
);
3403 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
3404 set_nlink(inode
, btrfs_inode_nlink(leaf
, inode_item
));
3405 i_uid_write(inode
, btrfs_inode_uid(leaf
, inode_item
));
3406 i_gid_write(inode
, btrfs_inode_gid(leaf
, inode_item
));
3407 btrfs_i_size_write(inode
, btrfs_inode_size(leaf
, inode_item
));
3409 tspec
= btrfs_inode_atime(inode_item
);
3410 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
3411 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
3413 tspec
= btrfs_inode_mtime(inode_item
);
3414 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
3415 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
3417 tspec
= btrfs_inode_ctime(inode_item
);
3418 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
3419 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
3421 inode_set_bytes(inode
, btrfs_inode_nbytes(leaf
, inode_item
));
3422 BTRFS_I(inode
)->generation
= btrfs_inode_generation(leaf
, inode_item
);
3423 BTRFS_I(inode
)->last_trans
= btrfs_inode_transid(leaf
, inode_item
);
3426 * If we were modified in the current generation and evicted from memory
3427 * and then re-read we need to do a full sync since we don't have any
3428 * idea about which extents were modified before we were evicted from
3431 if (BTRFS_I(inode
)->last_trans
== root
->fs_info
->generation
)
3432 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3433 &BTRFS_I(inode
)->runtime_flags
);
3435 inode
->i_version
= btrfs_inode_sequence(leaf
, inode_item
);
3436 inode
->i_generation
= BTRFS_I(inode
)->generation
;
3438 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
3440 BTRFS_I(inode
)->index_cnt
= (u64
)-1;
3441 BTRFS_I(inode
)->flags
= btrfs_inode_flags(leaf
, inode_item
);
3445 if (inode
->i_nlink
!= 1 ||
3446 path
->slots
[0] >= btrfs_header_nritems(leaf
))
3449 btrfs_item_key_to_cpu(leaf
, &location
, path
->slots
[0]);
3450 if (location
.objectid
!= btrfs_ino(inode
))
3453 ptr
= btrfs_item_ptr_offset(leaf
, path
->slots
[0]);
3454 if (location
.type
== BTRFS_INODE_REF_KEY
) {
3455 struct btrfs_inode_ref
*ref
;
3457 ref
= (struct btrfs_inode_ref
*)ptr
;
3458 BTRFS_I(inode
)->dir_index
= btrfs_inode_ref_index(leaf
, ref
);
3459 } else if (location
.type
== BTRFS_INODE_EXTREF_KEY
) {
3460 struct btrfs_inode_extref
*extref
;
3462 extref
= (struct btrfs_inode_extref
*)ptr
;
3463 BTRFS_I(inode
)->dir_index
= btrfs_inode_extref_index(leaf
,
3468 * try to precache a NULL acl entry for files that don't have
3469 * any xattrs or acls
3471 maybe_acls
= acls_after_inode_item(leaf
, path
->slots
[0],
3472 btrfs_ino(inode
), &first_xattr_slot
);
3473 if (first_xattr_slot
!= -1) {
3474 path
->slots
[0] = first_xattr_slot
;
3475 ret
= btrfs_load_inode_props(inode
, path
);
3477 btrfs_err(root
->fs_info
,
3478 "error loading props for ino %llu (root %llu): %d\n",
3480 root
->root_key
.objectid
, ret
);
3482 btrfs_free_path(path
);
3485 cache_no_acl(inode
);
3487 switch (inode
->i_mode
& S_IFMT
) {
3489 inode
->i_mapping
->a_ops
= &btrfs_aops
;
3490 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
3491 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
3492 inode
->i_fop
= &btrfs_file_operations
;
3493 inode
->i_op
= &btrfs_file_inode_operations
;
3496 inode
->i_fop
= &btrfs_dir_file_operations
;
3497 if (root
== root
->fs_info
->tree_root
)
3498 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
3500 inode
->i_op
= &btrfs_dir_inode_operations
;
3503 inode
->i_op
= &btrfs_symlink_inode_operations
;
3504 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
3505 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
3508 inode
->i_op
= &btrfs_special_inode_operations
;
3509 init_special_inode(inode
, inode
->i_mode
, rdev
);
3513 btrfs_update_iflags(inode
);
3517 btrfs_free_path(path
);
3518 make_bad_inode(inode
);
3522 * given a leaf and an inode, copy the inode fields into the leaf
3524 static void fill_inode_item(struct btrfs_trans_handle
*trans
,
3525 struct extent_buffer
*leaf
,
3526 struct btrfs_inode_item
*item
,
3527 struct inode
*inode
)
3529 struct btrfs_map_token token
;
3531 btrfs_init_map_token(&token
);
3533 btrfs_set_token_inode_uid(leaf
, item
, i_uid_read(inode
), &token
);
3534 btrfs_set_token_inode_gid(leaf
, item
, i_gid_read(inode
), &token
);
3535 btrfs_set_token_inode_size(leaf
, item
, BTRFS_I(inode
)->disk_i_size
,
3537 btrfs_set_token_inode_mode(leaf
, item
, inode
->i_mode
, &token
);
3538 btrfs_set_token_inode_nlink(leaf
, item
, inode
->i_nlink
, &token
);
3540 btrfs_set_token_timespec_sec(leaf
, btrfs_inode_atime(item
),
3541 inode
->i_atime
.tv_sec
, &token
);
3542 btrfs_set_token_timespec_nsec(leaf
, btrfs_inode_atime(item
),
3543 inode
->i_atime
.tv_nsec
, &token
);
3545 btrfs_set_token_timespec_sec(leaf
, btrfs_inode_mtime(item
),
3546 inode
->i_mtime
.tv_sec
, &token
);
3547 btrfs_set_token_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
3548 inode
->i_mtime
.tv_nsec
, &token
);
3550 btrfs_set_token_timespec_sec(leaf
, btrfs_inode_ctime(item
),
3551 inode
->i_ctime
.tv_sec
, &token
);
3552 btrfs_set_token_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
3553 inode
->i_ctime
.tv_nsec
, &token
);
3555 btrfs_set_token_inode_nbytes(leaf
, item
, inode_get_bytes(inode
),
3557 btrfs_set_token_inode_generation(leaf
, item
, BTRFS_I(inode
)->generation
,
3559 btrfs_set_token_inode_sequence(leaf
, item
, inode
->i_version
, &token
);
3560 btrfs_set_token_inode_transid(leaf
, item
, trans
->transid
, &token
);
3561 btrfs_set_token_inode_rdev(leaf
, item
, inode
->i_rdev
, &token
);
3562 btrfs_set_token_inode_flags(leaf
, item
, BTRFS_I(inode
)->flags
, &token
);
3563 btrfs_set_token_inode_block_group(leaf
, item
, 0, &token
);
3567 * copy everything in the in-memory inode into the btree.
3569 static noinline
int btrfs_update_inode_item(struct btrfs_trans_handle
*trans
,
3570 struct btrfs_root
*root
, struct inode
*inode
)
3572 struct btrfs_inode_item
*inode_item
;
3573 struct btrfs_path
*path
;
3574 struct extent_buffer
*leaf
;
3577 path
= btrfs_alloc_path();
3581 path
->leave_spinning
= 1;
3582 ret
= btrfs_lookup_inode(trans
, root
, path
, &BTRFS_I(inode
)->location
,
3590 leaf
= path
->nodes
[0];
3591 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
3592 struct btrfs_inode_item
);
3594 fill_inode_item(trans
, leaf
, inode_item
, inode
);
3595 btrfs_mark_buffer_dirty(leaf
);
3596 btrfs_set_inode_last_trans(trans
, inode
);
3599 btrfs_free_path(path
);
3604 * copy everything in the in-memory inode into the btree.
3606 noinline
int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
3607 struct btrfs_root
*root
, struct inode
*inode
)
3612 * If the inode is a free space inode, we can deadlock during commit
3613 * if we put it into the delayed code.
3615 * The data relocation inode should also be directly updated
3618 if (!btrfs_is_free_space_inode(inode
)
3619 && root
->root_key
.objectid
!= BTRFS_DATA_RELOC_TREE_OBJECTID
) {
3620 btrfs_update_root_times(trans
, root
);
3622 ret
= btrfs_delayed_update_inode(trans
, root
, inode
);
3624 btrfs_set_inode_last_trans(trans
, inode
);
3628 return btrfs_update_inode_item(trans
, root
, inode
);
3631 noinline
int btrfs_update_inode_fallback(struct btrfs_trans_handle
*trans
,
3632 struct btrfs_root
*root
,
3633 struct inode
*inode
)
3637 ret
= btrfs_update_inode(trans
, root
, inode
);
3639 return btrfs_update_inode_item(trans
, root
, inode
);
3644 * unlink helper that gets used here in inode.c and in the tree logging
3645 * recovery code. It remove a link in a directory with a given name, and
3646 * also drops the back refs in the inode to the directory
3648 static int __btrfs_unlink_inode(struct btrfs_trans_handle
*trans
,
3649 struct btrfs_root
*root
,
3650 struct inode
*dir
, struct inode
*inode
,
3651 const char *name
, int name_len
)
3653 struct btrfs_path
*path
;
3655 struct extent_buffer
*leaf
;
3656 struct btrfs_dir_item
*di
;
3657 struct btrfs_key key
;
3659 u64 ino
= btrfs_ino(inode
);
3660 u64 dir_ino
= btrfs_ino(dir
);
3662 path
= btrfs_alloc_path();
3668 path
->leave_spinning
= 1;
3669 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir_ino
,
3670 name
, name_len
, -1);
3679 leaf
= path
->nodes
[0];
3680 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
3681 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
3684 btrfs_release_path(path
);
3687 * If we don't have dir index, we have to get it by looking up
3688 * the inode ref, since we get the inode ref, remove it directly,
3689 * it is unnecessary to do delayed deletion.
3691 * But if we have dir index, needn't search inode ref to get it.
3692 * Since the inode ref is close to the inode item, it is better
3693 * that we delay to delete it, and just do this deletion when
3694 * we update the inode item.
3696 if (BTRFS_I(inode
)->dir_index
) {
3697 ret
= btrfs_delayed_delete_inode_ref(inode
);
3699 index
= BTRFS_I(inode
)->dir_index
;
3704 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
, ino
,
3707 btrfs_info(root
->fs_info
,
3708 "failed to delete reference to %.*s, inode %llu parent %llu",
3709 name_len
, name
, ino
, dir_ino
);
3710 btrfs_abort_transaction(trans
, root
, ret
);
3714 ret
= btrfs_delete_delayed_dir_index(trans
, root
, dir
, index
);
3716 btrfs_abort_transaction(trans
, root
, ret
);
3720 ret
= btrfs_del_inode_ref_in_log(trans
, root
, name
, name_len
,
3722 if (ret
!= 0 && ret
!= -ENOENT
) {
3723 btrfs_abort_transaction(trans
, root
, ret
);
3727 ret
= btrfs_del_dir_entries_in_log(trans
, root
, name
, name_len
,
3732 btrfs_abort_transaction(trans
, root
, ret
);
3734 btrfs_free_path(path
);
3738 btrfs_i_size_write(dir
, dir
->i_size
- name_len
* 2);
3739 inode_inc_iversion(inode
);
3740 inode_inc_iversion(dir
);
3741 inode
->i_ctime
= dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
3742 ret
= btrfs_update_inode(trans
, root
, dir
);
3747 int btrfs_unlink_inode(struct btrfs_trans_handle
*trans
,
3748 struct btrfs_root
*root
,
3749 struct inode
*dir
, struct inode
*inode
,
3750 const char *name
, int name_len
)
3753 ret
= __btrfs_unlink_inode(trans
, root
, dir
, inode
, name
, name_len
);
3756 ret
= btrfs_update_inode(trans
, root
, inode
);
3762 * helper to start transaction for unlink and rmdir.
3764 * unlink and rmdir are special in btrfs, they do not always free space, so
3765 * if we cannot make our reservations the normal way try and see if there is
3766 * plenty of slack room in the global reserve to migrate, otherwise we cannot
3767 * allow the unlink to occur.
3769 static struct btrfs_trans_handle
*__unlink_start_trans(struct inode
*dir
)
3771 struct btrfs_trans_handle
*trans
;
3772 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3776 * 1 for the possible orphan item
3777 * 1 for the dir item
3778 * 1 for the dir index
3779 * 1 for the inode ref
3782 trans
= btrfs_start_transaction(root
, 5);
3783 if (!IS_ERR(trans
) || PTR_ERR(trans
) != -ENOSPC
)
3786 if (PTR_ERR(trans
) == -ENOSPC
) {
3787 u64 num_bytes
= btrfs_calc_trans_metadata_size(root
, 5);
3789 trans
= btrfs_start_transaction(root
, 0);
3792 ret
= btrfs_cond_migrate_bytes(root
->fs_info
,
3793 &root
->fs_info
->trans_block_rsv
,
3796 btrfs_end_transaction(trans
, root
);
3797 return ERR_PTR(ret
);
3799 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
3800 trans
->bytes_reserved
= num_bytes
;
3805 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
3807 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3808 struct btrfs_trans_handle
*trans
;
3809 struct inode
*inode
= dentry
->d_inode
;
3812 trans
= __unlink_start_trans(dir
);
3814 return PTR_ERR(trans
);
3816 btrfs_record_unlink_dir(trans
, dir
, dentry
->d_inode
, 0);
3818 ret
= btrfs_unlink_inode(trans
, root
, dir
, dentry
->d_inode
,
3819 dentry
->d_name
.name
, dentry
->d_name
.len
);
3823 if (inode
->i_nlink
== 0) {
3824 ret
= btrfs_orphan_add(trans
, inode
);
3830 btrfs_end_transaction(trans
, root
);
3831 btrfs_btree_balance_dirty(root
);
3835 int btrfs_unlink_subvol(struct btrfs_trans_handle
*trans
,
3836 struct btrfs_root
*root
,
3837 struct inode
*dir
, u64 objectid
,
3838 const char *name
, int name_len
)
3840 struct btrfs_path
*path
;
3841 struct extent_buffer
*leaf
;
3842 struct btrfs_dir_item
*di
;
3843 struct btrfs_key key
;
3846 u64 dir_ino
= btrfs_ino(dir
);
3848 path
= btrfs_alloc_path();
3852 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir_ino
,
3853 name
, name_len
, -1);
3854 if (IS_ERR_OR_NULL(di
)) {
3862 leaf
= path
->nodes
[0];
3863 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
3864 WARN_ON(key
.type
!= BTRFS_ROOT_ITEM_KEY
|| key
.objectid
!= objectid
);
3865 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
3867 btrfs_abort_transaction(trans
, root
, ret
);
3870 btrfs_release_path(path
);
3872 ret
= btrfs_del_root_ref(trans
, root
->fs_info
->tree_root
,
3873 objectid
, root
->root_key
.objectid
,
3874 dir_ino
, &index
, name
, name_len
);
3876 if (ret
!= -ENOENT
) {
3877 btrfs_abort_transaction(trans
, root
, ret
);
3880 di
= btrfs_search_dir_index_item(root
, path
, dir_ino
,
3882 if (IS_ERR_OR_NULL(di
)) {
3887 btrfs_abort_transaction(trans
, root
, ret
);
3891 leaf
= path
->nodes
[0];
3892 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
3893 btrfs_release_path(path
);
3896 btrfs_release_path(path
);
3898 ret
= btrfs_delete_delayed_dir_index(trans
, root
, dir
, index
);
3900 btrfs_abort_transaction(trans
, root
, ret
);
3904 btrfs_i_size_write(dir
, dir
->i_size
- name_len
* 2);
3905 inode_inc_iversion(dir
);
3906 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
3907 ret
= btrfs_update_inode_fallback(trans
, root
, dir
);
3909 btrfs_abort_transaction(trans
, root
, ret
);
3911 btrfs_free_path(path
);
3915 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
3917 struct inode
*inode
= dentry
->d_inode
;
3919 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3920 struct btrfs_trans_handle
*trans
;
3922 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
3924 if (btrfs_ino(inode
) == BTRFS_FIRST_FREE_OBJECTID
)
3927 trans
= __unlink_start_trans(dir
);
3929 return PTR_ERR(trans
);
3931 if (unlikely(btrfs_ino(inode
) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)) {
3932 err
= btrfs_unlink_subvol(trans
, root
, dir
,
3933 BTRFS_I(inode
)->location
.objectid
,
3934 dentry
->d_name
.name
,
3935 dentry
->d_name
.len
);
3939 err
= btrfs_orphan_add(trans
, inode
);
3943 /* now the directory is empty */
3944 err
= btrfs_unlink_inode(trans
, root
, dir
, dentry
->d_inode
,
3945 dentry
->d_name
.name
, dentry
->d_name
.len
);
3947 btrfs_i_size_write(inode
, 0);
3949 btrfs_end_transaction(trans
, root
);
3950 btrfs_btree_balance_dirty(root
);
3956 * this can truncate away extent items, csum items and directory items.
3957 * It starts at a high offset and removes keys until it can't find
3958 * any higher than new_size
3960 * csum items that cross the new i_size are truncated to the new size
3963 * min_type is the minimum key type to truncate down to. If set to 0, this
3964 * will kill all the items on this inode, including the INODE_ITEM_KEY.
3966 int btrfs_truncate_inode_items(struct btrfs_trans_handle
*trans
,
3967 struct btrfs_root
*root
,
3968 struct inode
*inode
,
3969 u64 new_size
, u32 min_type
)
3971 struct btrfs_path
*path
;
3972 struct extent_buffer
*leaf
;
3973 struct btrfs_file_extent_item
*fi
;
3974 struct btrfs_key key
;
3975 struct btrfs_key found_key
;
3976 u64 extent_start
= 0;
3977 u64 extent_num_bytes
= 0;
3978 u64 extent_offset
= 0;
3980 u64 last_size
= (u64
)-1;
3981 u32 found_type
= (u8
)-1;
3984 int pending_del_nr
= 0;
3985 int pending_del_slot
= 0;
3986 int extent_type
= -1;
3989 u64 ino
= btrfs_ino(inode
);
3991 BUG_ON(new_size
> 0 && min_type
!= BTRFS_EXTENT_DATA_KEY
);
3993 path
= btrfs_alloc_path();
3999 * We want to drop from the next block forward in case this new size is
4000 * not block aligned since we will be keeping the last block of the
4001 * extent just the way it is.
4003 if (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) ||
4004 root
== root
->fs_info
->tree_root
)
4005 btrfs_drop_extent_cache(inode
, ALIGN(new_size
,
4006 root
->sectorsize
), (u64
)-1, 0);
4009 * This function is also used to drop the items in the log tree before
4010 * we relog the inode, so if root != BTRFS_I(inode)->root, it means
4011 * it is used to drop the loged items. So we shouldn't kill the delayed
4014 if (min_type
== 0 && root
== BTRFS_I(inode
)->root
)
4015 btrfs_kill_delayed_inode_items(inode
);
4018 key
.offset
= (u64
)-1;
4022 path
->leave_spinning
= 1;
4023 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
4030 /* there are no items in the tree for us to truncate, we're
4033 if (path
->slots
[0] == 0)
4040 leaf
= path
->nodes
[0];
4041 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
4042 found_type
= btrfs_key_type(&found_key
);
4044 if (found_key
.objectid
!= ino
)
4047 if (found_type
< min_type
)
4050 item_end
= found_key
.offset
;
4051 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
4052 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
4053 struct btrfs_file_extent_item
);
4054 extent_type
= btrfs_file_extent_type(leaf
, fi
);
4055 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
4057 btrfs_file_extent_num_bytes(leaf
, fi
);
4058 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
4059 item_end
+= btrfs_file_extent_inline_len(leaf
,
4060 path
->slots
[0], fi
);
4064 if (found_type
> min_type
) {
4067 if (item_end
< new_size
)
4069 if (found_key
.offset
>= new_size
)
4075 /* FIXME, shrink the extent if the ref count is only 1 */
4076 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
4080 last_size
= found_key
.offset
;
4082 last_size
= new_size
;
4084 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
4086 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
4088 u64 orig_num_bytes
=
4089 btrfs_file_extent_num_bytes(leaf
, fi
);
4090 extent_num_bytes
= ALIGN(new_size
-
4093 btrfs_set_file_extent_num_bytes(leaf
, fi
,
4095 num_dec
= (orig_num_bytes
-
4097 if (test_bit(BTRFS_ROOT_REF_COWS
,
4100 inode_sub_bytes(inode
, num_dec
);
4101 btrfs_mark_buffer_dirty(leaf
);
4104 btrfs_file_extent_disk_num_bytes(leaf
,
4106 extent_offset
= found_key
.offset
-
4107 btrfs_file_extent_offset(leaf
, fi
);
4109 /* FIXME blocksize != 4096 */
4110 num_dec
= btrfs_file_extent_num_bytes(leaf
, fi
);
4111 if (extent_start
!= 0) {
4113 if (test_bit(BTRFS_ROOT_REF_COWS
,
4115 inode_sub_bytes(inode
, num_dec
);
4118 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
4120 * we can't truncate inline items that have had
4124 btrfs_file_extent_compression(leaf
, fi
) == 0 &&
4125 btrfs_file_extent_encryption(leaf
, fi
) == 0 &&
4126 btrfs_file_extent_other_encoding(leaf
, fi
) == 0) {
4127 u32 size
= new_size
- found_key
.offset
;
4129 if (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
))
4130 inode_sub_bytes(inode
, item_end
+ 1 -
4134 * update the ram bytes to properly reflect
4135 * the new size of our item
4137 btrfs_set_file_extent_ram_bytes(leaf
, fi
, size
);
4139 btrfs_file_extent_calc_inline_size(size
);
4140 btrfs_truncate_item(root
, path
, size
, 1);
4141 } else if (test_bit(BTRFS_ROOT_REF_COWS
,
4143 inode_sub_bytes(inode
, item_end
+ 1 -
4149 if (!pending_del_nr
) {
4150 /* no pending yet, add ourselves */
4151 pending_del_slot
= path
->slots
[0];
4153 } else if (pending_del_nr
&&
4154 path
->slots
[0] + 1 == pending_del_slot
) {
4155 /* hop on the pending chunk */
4157 pending_del_slot
= path
->slots
[0];
4165 (test_bit(BTRFS_ROOT_REF_COWS
, &root
->state
) ||
4166 root
== root
->fs_info
->tree_root
)) {
4167 btrfs_set_path_blocking(path
);
4168 ret
= btrfs_free_extent(trans
, root
, extent_start
,
4169 extent_num_bytes
, 0,
4170 btrfs_header_owner(leaf
),
4171 ino
, extent_offset
, 0);
4175 if (found_type
== BTRFS_INODE_ITEM_KEY
)
4178 if (path
->slots
[0] == 0 ||
4179 path
->slots
[0] != pending_del_slot
) {
4180 if (pending_del_nr
) {
4181 ret
= btrfs_del_items(trans
, root
, path
,
4185 btrfs_abort_transaction(trans
,
4191 btrfs_release_path(path
);
4198 if (pending_del_nr
) {
4199 ret
= btrfs_del_items(trans
, root
, path
, pending_del_slot
,
4202 btrfs_abort_transaction(trans
, root
, ret
);
4205 if (last_size
!= (u64
)-1)
4206 btrfs_ordered_update_i_size(inode
, last_size
, NULL
);
4207 btrfs_free_path(path
);
4212 * btrfs_truncate_page - read, zero a chunk and write a page
4213 * @inode - inode that we're zeroing
4214 * @from - the offset to start zeroing
4215 * @len - the length to zero, 0 to zero the entire range respective to the
4217 * @front - zero up to the offset instead of from the offset on
4219 * This will find the page for the "from" offset and cow the page and zero the
4220 * part we want to zero. This is used with truncate and hole punching.
4222 int btrfs_truncate_page(struct inode
*inode
, loff_t from
, loff_t len
,
4225 struct address_space
*mapping
= inode
->i_mapping
;
4226 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4227 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4228 struct btrfs_ordered_extent
*ordered
;
4229 struct extent_state
*cached_state
= NULL
;
4231 u32 blocksize
= root
->sectorsize
;
4232 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
4233 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
4235 gfp_t mask
= btrfs_alloc_write_mask(mapping
);
4240 if ((offset
& (blocksize
- 1)) == 0 &&
4241 (!len
|| ((len
& (blocksize
- 1)) == 0)))
4243 ret
= btrfs_delalloc_reserve_space(inode
, PAGE_CACHE_SIZE
);
4248 page
= find_or_create_page(mapping
, index
, mask
);
4250 btrfs_delalloc_release_space(inode
, PAGE_CACHE_SIZE
);
4255 page_start
= page_offset(page
);
4256 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
4258 if (!PageUptodate(page
)) {
4259 ret
= btrfs_readpage(NULL
, page
);
4261 if (page
->mapping
!= mapping
) {
4263 page_cache_release(page
);
4266 if (!PageUptodate(page
)) {
4271 wait_on_page_writeback(page
);
4273 lock_extent_bits(io_tree
, page_start
, page_end
, 0, &cached_state
);
4274 set_page_extent_mapped(page
);
4276 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
4278 unlock_extent_cached(io_tree
, page_start
, page_end
,
4279 &cached_state
, GFP_NOFS
);
4281 page_cache_release(page
);
4282 btrfs_start_ordered_extent(inode
, ordered
, 1);
4283 btrfs_put_ordered_extent(ordered
);
4287 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
,
4288 EXTENT_DIRTY
| EXTENT_DELALLOC
|
4289 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
,
4290 0, 0, &cached_state
, GFP_NOFS
);
4292 ret
= btrfs_set_extent_delalloc(inode
, page_start
, page_end
,
4295 unlock_extent_cached(io_tree
, page_start
, page_end
,
4296 &cached_state
, GFP_NOFS
);
4300 if (offset
!= PAGE_CACHE_SIZE
) {
4302 len
= PAGE_CACHE_SIZE
- offset
;
4305 memset(kaddr
, 0, offset
);
4307 memset(kaddr
+ offset
, 0, len
);
4308 flush_dcache_page(page
);
4311 ClearPageChecked(page
);
4312 set_page_dirty(page
);
4313 unlock_extent_cached(io_tree
, page_start
, page_end
, &cached_state
,
4318 btrfs_delalloc_release_space(inode
, PAGE_CACHE_SIZE
);
4320 page_cache_release(page
);
4325 static int maybe_insert_hole(struct btrfs_root
*root
, struct inode
*inode
,
4326 u64 offset
, u64 len
)
4328 struct btrfs_trans_handle
*trans
;
4332 * Still need to make sure the inode looks like it's been updated so
4333 * that any holes get logged if we fsync.
4335 if (btrfs_fs_incompat(root
->fs_info
, NO_HOLES
)) {
4336 BTRFS_I(inode
)->last_trans
= root
->fs_info
->generation
;
4337 BTRFS_I(inode
)->last_sub_trans
= root
->log_transid
;
4338 BTRFS_I(inode
)->last_log_commit
= root
->last_log_commit
;
4343 * 1 - for the one we're dropping
4344 * 1 - for the one we're adding
4345 * 1 - for updating the inode.
4347 trans
= btrfs_start_transaction(root
, 3);
4349 return PTR_ERR(trans
);
4351 ret
= btrfs_drop_extents(trans
, root
, inode
, offset
, offset
+ len
, 1);
4353 btrfs_abort_transaction(trans
, root
, ret
);
4354 btrfs_end_transaction(trans
, root
);
4358 ret
= btrfs_insert_file_extent(trans
, root
, btrfs_ino(inode
), offset
,
4359 0, 0, len
, 0, len
, 0, 0, 0);
4361 btrfs_abort_transaction(trans
, root
, ret
);
4363 btrfs_update_inode(trans
, root
, inode
);
4364 btrfs_end_transaction(trans
, root
);
4369 * This function puts in dummy file extents for the area we're creating a hole
4370 * for. So if we are truncating this file to a larger size we need to insert
4371 * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for
4372 * the range between oldsize and size
4374 int btrfs_cont_expand(struct inode
*inode
, loff_t oldsize
, loff_t size
)
4376 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4377 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4378 struct extent_map
*em
= NULL
;
4379 struct extent_state
*cached_state
= NULL
;
4380 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
4381 u64 hole_start
= ALIGN(oldsize
, root
->sectorsize
);
4382 u64 block_end
= ALIGN(size
, root
->sectorsize
);
4389 * If our size started in the middle of a page we need to zero out the
4390 * rest of the page before we expand the i_size, otherwise we could
4391 * expose stale data.
4393 err
= btrfs_truncate_page(inode
, oldsize
, 0, 0);
4397 if (size
<= hole_start
)
4401 struct btrfs_ordered_extent
*ordered
;
4403 lock_extent_bits(io_tree
, hole_start
, block_end
- 1, 0,
4405 ordered
= btrfs_lookup_ordered_range(inode
, hole_start
,
4406 block_end
- hole_start
);
4409 unlock_extent_cached(io_tree
, hole_start
, block_end
- 1,
4410 &cached_state
, GFP_NOFS
);
4411 btrfs_start_ordered_extent(inode
, ordered
, 1);
4412 btrfs_put_ordered_extent(ordered
);
4415 cur_offset
= hole_start
;
4417 em
= btrfs_get_extent(inode
, NULL
, 0, cur_offset
,
4418 block_end
- cur_offset
, 0);
4424 last_byte
= min(extent_map_end(em
), block_end
);
4425 last_byte
= ALIGN(last_byte
, root
->sectorsize
);
4426 if (!test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
)) {
4427 struct extent_map
*hole_em
;
4428 hole_size
= last_byte
- cur_offset
;
4430 err
= maybe_insert_hole(root
, inode
, cur_offset
,
4434 btrfs_drop_extent_cache(inode
, cur_offset
,
4435 cur_offset
+ hole_size
- 1, 0);
4436 hole_em
= alloc_extent_map();
4438 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
4439 &BTRFS_I(inode
)->runtime_flags
);
4442 hole_em
->start
= cur_offset
;
4443 hole_em
->len
= hole_size
;
4444 hole_em
->orig_start
= cur_offset
;
4446 hole_em
->block_start
= EXTENT_MAP_HOLE
;
4447 hole_em
->block_len
= 0;
4448 hole_em
->orig_block_len
= 0;
4449 hole_em
->ram_bytes
= hole_size
;
4450 hole_em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
4451 hole_em
->compress_type
= BTRFS_COMPRESS_NONE
;
4452 hole_em
->generation
= root
->fs_info
->generation
;
4455 write_lock(&em_tree
->lock
);
4456 err
= add_extent_mapping(em_tree
, hole_em
, 1);
4457 write_unlock(&em_tree
->lock
);
4460 btrfs_drop_extent_cache(inode
, cur_offset
,
4464 free_extent_map(hole_em
);
4467 free_extent_map(em
);
4469 cur_offset
= last_byte
;
4470 if (cur_offset
>= block_end
)
4473 free_extent_map(em
);
4474 unlock_extent_cached(io_tree
, hole_start
, block_end
- 1, &cached_state
,
4479 static int btrfs_setsize(struct inode
*inode
, struct iattr
*attr
)
4481 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4482 struct btrfs_trans_handle
*trans
;
4483 loff_t oldsize
= i_size_read(inode
);
4484 loff_t newsize
= attr
->ia_size
;
4485 int mask
= attr
->ia_valid
;
4489 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
4490 * special case where we need to update the times despite not having
4491 * these flags set. For all other operations the VFS set these flags
4492 * explicitly if it wants a timestamp update.
4494 if (newsize
!= oldsize
) {
4495 inode_inc_iversion(inode
);
4496 if (!(mask
& (ATTR_CTIME
| ATTR_MTIME
)))
4497 inode
->i_ctime
= inode
->i_mtime
=
4498 current_fs_time(inode
->i_sb
);
4501 if (newsize
> oldsize
) {
4502 truncate_pagecache(inode
, newsize
);
4503 ret
= btrfs_cont_expand(inode
, oldsize
, newsize
);
4507 trans
= btrfs_start_transaction(root
, 1);
4509 return PTR_ERR(trans
);
4511 i_size_write(inode
, newsize
);
4512 btrfs_ordered_update_i_size(inode
, i_size_read(inode
), NULL
);
4513 ret
= btrfs_update_inode(trans
, root
, inode
);
4514 btrfs_end_transaction(trans
, root
);
4518 * We're truncating a file that used to have good data down to
4519 * zero. Make sure it gets into the ordered flush list so that
4520 * any new writes get down to disk quickly.
4523 set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE
,
4524 &BTRFS_I(inode
)->runtime_flags
);
4527 * 1 for the orphan item we're going to add
4528 * 1 for the orphan item deletion.
4530 trans
= btrfs_start_transaction(root
, 2);
4532 return PTR_ERR(trans
);
4535 * We need to do this in case we fail at _any_ point during the
4536 * actual truncate. Once we do the truncate_setsize we could
4537 * invalidate pages which forces any outstanding ordered io to
4538 * be instantly completed which will give us extents that need
4539 * to be truncated. If we fail to get an orphan inode down we
4540 * could have left over extents that were never meant to live,
4541 * so we need to garuntee from this point on that everything
4542 * will be consistent.
4544 ret
= btrfs_orphan_add(trans
, inode
);
4545 btrfs_end_transaction(trans
, root
);
4549 /* we don't support swapfiles, so vmtruncate shouldn't fail */
4550 truncate_setsize(inode
, newsize
);
4552 /* Disable nonlocked read DIO to avoid the end less truncate */
4553 btrfs_inode_block_unlocked_dio(inode
);
4554 inode_dio_wait(inode
);
4555 btrfs_inode_resume_unlocked_dio(inode
);
4557 ret
= btrfs_truncate(inode
);
4558 if (ret
&& inode
->i_nlink
) {
4562 * failed to truncate, disk_i_size is only adjusted down
4563 * as we remove extents, so it should represent the true
4564 * size of the inode, so reset the in memory size and
4565 * delete our orphan entry.
4567 trans
= btrfs_join_transaction(root
);
4568 if (IS_ERR(trans
)) {
4569 btrfs_orphan_del(NULL
, inode
);
4572 i_size_write(inode
, BTRFS_I(inode
)->disk_i_size
);
4573 err
= btrfs_orphan_del(trans
, inode
);
4575 btrfs_abort_transaction(trans
, root
, err
);
4576 btrfs_end_transaction(trans
, root
);
4583 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
4585 struct inode
*inode
= dentry
->d_inode
;
4586 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4589 if (btrfs_root_readonly(root
))
4592 err
= inode_change_ok(inode
, attr
);
4596 if (S_ISREG(inode
->i_mode
) && (attr
->ia_valid
& ATTR_SIZE
)) {
4597 err
= btrfs_setsize(inode
, attr
);
4602 if (attr
->ia_valid
) {
4603 setattr_copy(inode
, attr
);
4604 inode_inc_iversion(inode
);
4605 err
= btrfs_dirty_inode(inode
);
4607 if (!err
&& attr
->ia_valid
& ATTR_MODE
)
4608 err
= posix_acl_chmod(inode
, inode
->i_mode
);
4615 * While truncating the inode pages during eviction, we get the VFS calling
4616 * btrfs_invalidatepage() against each page of the inode. This is slow because
4617 * the calls to btrfs_invalidatepage() result in a huge amount of calls to
4618 * lock_extent_bits() and clear_extent_bit(), which keep merging and splitting
4619 * extent_state structures over and over, wasting lots of time.
4621 * Therefore if the inode is being evicted, let btrfs_invalidatepage() skip all
4622 * those expensive operations on a per page basis and do only the ordered io
4623 * finishing, while we release here the extent_map and extent_state structures,
4624 * without the excessive merging and splitting.
4626 static void evict_inode_truncate_pages(struct inode
*inode
)
4628 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4629 struct extent_map_tree
*map_tree
= &BTRFS_I(inode
)->extent_tree
;
4630 struct rb_node
*node
;
4632 ASSERT(inode
->i_state
& I_FREEING
);
4633 truncate_inode_pages_final(&inode
->i_data
);
4635 write_lock(&map_tree
->lock
);
4636 while (!RB_EMPTY_ROOT(&map_tree
->map
)) {
4637 struct extent_map
*em
;
4639 node
= rb_first(&map_tree
->map
);
4640 em
= rb_entry(node
, struct extent_map
, rb_node
);
4641 clear_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
4642 clear_bit(EXTENT_FLAG_LOGGING
, &em
->flags
);
4643 remove_extent_mapping(map_tree
, em
);
4644 free_extent_map(em
);
4646 write_unlock(&map_tree
->lock
);
4648 spin_lock(&io_tree
->lock
);
4649 while (!RB_EMPTY_ROOT(&io_tree
->state
)) {
4650 struct extent_state
*state
;
4651 struct extent_state
*cached_state
= NULL
;
4653 node
= rb_first(&io_tree
->state
);
4654 state
= rb_entry(node
, struct extent_state
, rb_node
);
4655 atomic_inc(&state
->refs
);
4656 spin_unlock(&io_tree
->lock
);
4658 lock_extent_bits(io_tree
, state
->start
, state
->end
,
4660 clear_extent_bit(io_tree
, state
->start
, state
->end
,
4661 EXTENT_LOCKED
| EXTENT_DIRTY
|
4662 EXTENT_DELALLOC
| EXTENT_DO_ACCOUNTING
|
4663 EXTENT_DEFRAG
, 1, 1,
4664 &cached_state
, GFP_NOFS
);
4665 free_extent_state(state
);
4667 spin_lock(&io_tree
->lock
);
4669 spin_unlock(&io_tree
->lock
);
4672 void btrfs_evict_inode(struct inode
*inode
)
4674 struct btrfs_trans_handle
*trans
;
4675 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4676 struct btrfs_block_rsv
*rsv
, *global_rsv
;
4677 u64 min_size
= btrfs_calc_trunc_metadata_size(root
, 1);
4680 trace_btrfs_inode_evict(inode
);
4682 evict_inode_truncate_pages(inode
);
4684 if (inode
->i_nlink
&&
4685 ((btrfs_root_refs(&root
->root_item
) != 0 &&
4686 root
->root_key
.objectid
!= BTRFS_ROOT_TREE_OBJECTID
) ||
4687 btrfs_is_free_space_inode(inode
)))
4690 if (is_bad_inode(inode
)) {
4691 btrfs_orphan_del(NULL
, inode
);
4694 /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */
4695 btrfs_wait_ordered_range(inode
, 0, (u64
)-1);
4697 if (root
->fs_info
->log_root_recovering
) {
4698 BUG_ON(test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
4699 &BTRFS_I(inode
)->runtime_flags
));
4703 if (inode
->i_nlink
> 0) {
4704 BUG_ON(btrfs_root_refs(&root
->root_item
) != 0 &&
4705 root
->root_key
.objectid
!= BTRFS_ROOT_TREE_OBJECTID
);
4709 ret
= btrfs_commit_inode_delayed_inode(inode
);
4711 btrfs_orphan_del(NULL
, inode
);
4715 rsv
= btrfs_alloc_block_rsv(root
, BTRFS_BLOCK_RSV_TEMP
);
4717 btrfs_orphan_del(NULL
, inode
);
4720 rsv
->size
= min_size
;
4722 global_rsv
= &root
->fs_info
->global_block_rsv
;
4724 btrfs_i_size_write(inode
, 0);
4727 * This is a bit simpler than btrfs_truncate since we've already
4728 * reserved our space for our orphan item in the unlink, so we just
4729 * need to reserve some slack space in case we add bytes and update
4730 * inode item when doing the truncate.
4733 ret
= btrfs_block_rsv_refill(root
, rsv
, min_size
,
4734 BTRFS_RESERVE_FLUSH_LIMIT
);
4737 * Try and steal from the global reserve since we will
4738 * likely not use this space anyway, we want to try as
4739 * hard as possible to get this to work.
4742 ret
= btrfs_block_rsv_migrate(global_rsv
, rsv
, min_size
);
4745 btrfs_warn(root
->fs_info
,
4746 "Could not get space for a delete, will truncate on mount %d",
4748 btrfs_orphan_del(NULL
, inode
);
4749 btrfs_free_block_rsv(root
, rsv
);
4753 trans
= btrfs_join_transaction(root
);
4754 if (IS_ERR(trans
)) {
4755 btrfs_orphan_del(NULL
, inode
);
4756 btrfs_free_block_rsv(root
, rsv
);
4760 trans
->block_rsv
= rsv
;
4762 ret
= btrfs_truncate_inode_items(trans
, root
, inode
, 0, 0);
4766 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
4767 btrfs_end_transaction(trans
, root
);
4769 btrfs_btree_balance_dirty(root
);
4772 btrfs_free_block_rsv(root
, rsv
);
4775 * Errors here aren't a big deal, it just means we leave orphan items
4776 * in the tree. They will be cleaned up on the next mount.
4779 trans
->block_rsv
= root
->orphan_block_rsv
;
4780 btrfs_orphan_del(trans
, inode
);
4782 btrfs_orphan_del(NULL
, inode
);
4785 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
4786 if (!(root
== root
->fs_info
->tree_root
||
4787 root
->root_key
.objectid
== BTRFS_TREE_RELOC_OBJECTID
))
4788 btrfs_return_ino(root
, btrfs_ino(inode
));
4790 btrfs_end_transaction(trans
, root
);
4791 btrfs_btree_balance_dirty(root
);
4793 btrfs_remove_delayed_node(inode
);
4799 * this returns the key found in the dir entry in the location pointer.
4800 * If no dir entries were found, location->objectid is 0.
4802 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
4803 struct btrfs_key
*location
)
4805 const char *name
= dentry
->d_name
.name
;
4806 int namelen
= dentry
->d_name
.len
;
4807 struct btrfs_dir_item
*di
;
4808 struct btrfs_path
*path
;
4809 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
4812 path
= btrfs_alloc_path();
4816 di
= btrfs_lookup_dir_item(NULL
, root
, path
, btrfs_ino(dir
), name
,
4821 if (IS_ERR_OR_NULL(di
))
4824 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
4826 btrfs_free_path(path
);
4829 location
->objectid
= 0;
4834 * when we hit a tree root in a directory, the btrfs part of the inode
4835 * needs to be changed to reflect the root directory of the tree root. This
4836 * is kind of like crossing a mount point.
4838 static int fixup_tree_root_location(struct btrfs_root
*root
,
4840 struct dentry
*dentry
,
4841 struct btrfs_key
*location
,
4842 struct btrfs_root
**sub_root
)
4844 struct btrfs_path
*path
;
4845 struct btrfs_root
*new_root
;
4846 struct btrfs_root_ref
*ref
;
4847 struct extent_buffer
*leaf
;
4851 path
= btrfs_alloc_path();
4858 ret
= btrfs_find_item(root
->fs_info
->tree_root
, path
,
4859 BTRFS_I(dir
)->root
->root_key
.objectid
,
4860 location
->objectid
, BTRFS_ROOT_REF_KEY
, NULL
);
4867 leaf
= path
->nodes
[0];
4868 ref
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_root_ref
);
4869 if (btrfs_root_ref_dirid(leaf
, ref
) != btrfs_ino(dir
) ||
4870 btrfs_root_ref_name_len(leaf
, ref
) != dentry
->d_name
.len
)
4873 ret
= memcmp_extent_buffer(leaf
, dentry
->d_name
.name
,
4874 (unsigned long)(ref
+ 1),
4875 dentry
->d_name
.len
);
4879 btrfs_release_path(path
);
4881 new_root
= btrfs_read_fs_root_no_name(root
->fs_info
, location
);
4882 if (IS_ERR(new_root
)) {
4883 err
= PTR_ERR(new_root
);
4887 *sub_root
= new_root
;
4888 location
->objectid
= btrfs_root_dirid(&new_root
->root_item
);
4889 location
->type
= BTRFS_INODE_ITEM_KEY
;
4890 location
->offset
= 0;
4893 btrfs_free_path(path
);
4897 static void inode_tree_add(struct inode
*inode
)
4899 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4900 struct btrfs_inode
*entry
;
4902 struct rb_node
*parent
;
4903 struct rb_node
*new = &BTRFS_I(inode
)->rb_node
;
4904 u64 ino
= btrfs_ino(inode
);
4906 if (inode_unhashed(inode
))
4909 spin_lock(&root
->inode_lock
);
4910 p
= &root
->inode_tree
.rb_node
;
4913 entry
= rb_entry(parent
, struct btrfs_inode
, rb_node
);
4915 if (ino
< btrfs_ino(&entry
->vfs_inode
))
4916 p
= &parent
->rb_left
;
4917 else if (ino
> btrfs_ino(&entry
->vfs_inode
))
4918 p
= &parent
->rb_right
;
4920 WARN_ON(!(entry
->vfs_inode
.i_state
&
4921 (I_WILL_FREE
| I_FREEING
)));
4922 rb_replace_node(parent
, new, &root
->inode_tree
);
4923 RB_CLEAR_NODE(parent
);
4924 spin_unlock(&root
->inode_lock
);
4928 rb_link_node(new, parent
, p
);
4929 rb_insert_color(new, &root
->inode_tree
);
4930 spin_unlock(&root
->inode_lock
);
4933 static void inode_tree_del(struct inode
*inode
)
4935 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4938 spin_lock(&root
->inode_lock
);
4939 if (!RB_EMPTY_NODE(&BTRFS_I(inode
)->rb_node
)) {
4940 rb_erase(&BTRFS_I(inode
)->rb_node
, &root
->inode_tree
);
4941 RB_CLEAR_NODE(&BTRFS_I(inode
)->rb_node
);
4942 empty
= RB_EMPTY_ROOT(&root
->inode_tree
);
4944 spin_unlock(&root
->inode_lock
);
4946 if (empty
&& btrfs_root_refs(&root
->root_item
) == 0) {
4947 synchronize_srcu(&root
->fs_info
->subvol_srcu
);
4948 spin_lock(&root
->inode_lock
);
4949 empty
= RB_EMPTY_ROOT(&root
->inode_tree
);
4950 spin_unlock(&root
->inode_lock
);
4952 btrfs_add_dead_root(root
);
4956 void btrfs_invalidate_inodes(struct btrfs_root
*root
)
4958 struct rb_node
*node
;
4959 struct rb_node
*prev
;
4960 struct btrfs_inode
*entry
;
4961 struct inode
*inode
;
4964 if (!test_bit(BTRFS_FS_STATE_ERROR
, &root
->fs_info
->fs_state
))
4965 WARN_ON(btrfs_root_refs(&root
->root_item
) != 0);
4967 spin_lock(&root
->inode_lock
);
4969 node
= root
->inode_tree
.rb_node
;
4973 entry
= rb_entry(node
, struct btrfs_inode
, rb_node
);
4975 if (objectid
< btrfs_ino(&entry
->vfs_inode
))
4976 node
= node
->rb_left
;
4977 else if (objectid
> btrfs_ino(&entry
->vfs_inode
))
4978 node
= node
->rb_right
;
4984 entry
= rb_entry(prev
, struct btrfs_inode
, rb_node
);
4985 if (objectid
<= btrfs_ino(&entry
->vfs_inode
)) {
4989 prev
= rb_next(prev
);
4993 entry
= rb_entry(node
, struct btrfs_inode
, rb_node
);
4994 objectid
= btrfs_ino(&entry
->vfs_inode
) + 1;
4995 inode
= igrab(&entry
->vfs_inode
);
4997 spin_unlock(&root
->inode_lock
);
4998 if (atomic_read(&inode
->i_count
) > 1)
4999 d_prune_aliases(inode
);
5001 * btrfs_drop_inode will have it removed from
5002 * the inode cache when its usage count
5007 spin_lock(&root
->inode_lock
);
5011 if (cond_resched_lock(&root
->inode_lock
))
5014 node
= rb_next(node
);
5016 spin_unlock(&root
->inode_lock
);
5019 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
5021 struct btrfs_iget_args
*args
= p
;
5022 inode
->i_ino
= args
->location
->objectid
;
5023 memcpy(&BTRFS_I(inode
)->location
, args
->location
,
5024 sizeof(*args
->location
));
5025 BTRFS_I(inode
)->root
= args
->root
;
5029 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
5031 struct btrfs_iget_args
*args
= opaque
;
5032 return args
->location
->objectid
== BTRFS_I(inode
)->location
.objectid
&&
5033 args
->root
== BTRFS_I(inode
)->root
;
5036 static struct inode
*btrfs_iget_locked(struct super_block
*s
,
5037 struct btrfs_key
*location
,
5038 struct btrfs_root
*root
)
5040 struct inode
*inode
;
5041 struct btrfs_iget_args args
;
5042 unsigned long hashval
= btrfs_inode_hash(location
->objectid
, root
);
5044 args
.location
= location
;
5047 inode
= iget5_locked(s
, hashval
, btrfs_find_actor
,
5048 btrfs_init_locked_inode
,
5053 /* Get an inode object given its location and corresponding root.
5054 * Returns in *is_new if the inode was read from disk
5056 struct inode
*btrfs_iget(struct super_block
*s
, struct btrfs_key
*location
,
5057 struct btrfs_root
*root
, int *new)
5059 struct inode
*inode
;
5061 inode
= btrfs_iget_locked(s
, location
, root
);
5063 return ERR_PTR(-ENOMEM
);
5065 if (inode
->i_state
& I_NEW
) {
5066 btrfs_read_locked_inode(inode
);
5067 if (!is_bad_inode(inode
)) {
5068 inode_tree_add(inode
);
5069 unlock_new_inode(inode
);
5073 unlock_new_inode(inode
);
5075 inode
= ERR_PTR(-ESTALE
);
5082 static struct inode
*new_simple_dir(struct super_block
*s
,
5083 struct btrfs_key
*key
,
5084 struct btrfs_root
*root
)
5086 struct inode
*inode
= new_inode(s
);
5089 return ERR_PTR(-ENOMEM
);
5091 BTRFS_I(inode
)->root
= root
;
5092 memcpy(&BTRFS_I(inode
)->location
, key
, sizeof(*key
));
5093 set_bit(BTRFS_INODE_DUMMY
, &BTRFS_I(inode
)->runtime_flags
);
5095 inode
->i_ino
= BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
;
5096 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
5097 inode
->i_fop
= &simple_dir_operations
;
5098 inode
->i_mode
= S_IFDIR
| S_IRUGO
| S_IWUSR
| S_IXUGO
;
5099 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
5104 struct inode
*btrfs_lookup_dentry(struct inode
*dir
, struct dentry
*dentry
)
5106 struct inode
*inode
;
5107 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
5108 struct btrfs_root
*sub_root
= root
;
5109 struct btrfs_key location
;
5113 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
5114 return ERR_PTR(-ENAMETOOLONG
);
5116 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
5118 return ERR_PTR(ret
);
5120 if (location
.objectid
== 0)
5121 return ERR_PTR(-ENOENT
);
5123 if (location
.type
== BTRFS_INODE_ITEM_KEY
) {
5124 inode
= btrfs_iget(dir
->i_sb
, &location
, root
, NULL
);
5128 BUG_ON(location
.type
!= BTRFS_ROOT_ITEM_KEY
);
5130 index
= srcu_read_lock(&root
->fs_info
->subvol_srcu
);
5131 ret
= fixup_tree_root_location(root
, dir
, dentry
,
5132 &location
, &sub_root
);
5135 inode
= ERR_PTR(ret
);
5137 inode
= new_simple_dir(dir
->i_sb
, &location
, sub_root
);
5139 inode
= btrfs_iget(dir
->i_sb
, &location
, sub_root
, NULL
);
5141 srcu_read_unlock(&root
->fs_info
->subvol_srcu
, index
);
5143 if (!IS_ERR(inode
) && root
!= sub_root
) {
5144 down_read(&root
->fs_info
->cleanup_work_sem
);
5145 if (!(inode
->i_sb
->s_flags
& MS_RDONLY
))
5146 ret
= btrfs_orphan_cleanup(sub_root
);
5147 up_read(&root
->fs_info
->cleanup_work_sem
);
5150 inode
= ERR_PTR(ret
);
5157 static int btrfs_dentry_delete(const struct dentry
*dentry
)
5159 struct btrfs_root
*root
;
5160 struct inode
*inode
= dentry
->d_inode
;
5162 if (!inode
&& !IS_ROOT(dentry
))
5163 inode
= dentry
->d_parent
->d_inode
;
5166 root
= BTRFS_I(inode
)->root
;
5167 if (btrfs_root_refs(&root
->root_item
) == 0)
5170 if (btrfs_ino(inode
) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)
5176 static void btrfs_dentry_release(struct dentry
*dentry
)
5178 kfree(dentry
->d_fsdata
);
5181 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
5184 struct inode
*inode
;
5186 inode
= btrfs_lookup_dentry(dir
, dentry
);
5187 if (IS_ERR(inode
)) {
5188 if (PTR_ERR(inode
) == -ENOENT
)
5191 return ERR_CAST(inode
);
5194 return d_materialise_unique(dentry
, inode
);
5197 unsigned char btrfs_filetype_table
[] = {
5198 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
5201 static int btrfs_real_readdir(struct file
*file
, struct dir_context
*ctx
)
5203 struct inode
*inode
= file_inode(file
);
5204 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5205 struct btrfs_item
*item
;
5206 struct btrfs_dir_item
*di
;
5207 struct btrfs_key key
;
5208 struct btrfs_key found_key
;
5209 struct btrfs_path
*path
;
5210 struct list_head ins_list
;
5211 struct list_head del_list
;
5213 struct extent_buffer
*leaf
;
5215 unsigned char d_type
;
5220 int key_type
= BTRFS_DIR_INDEX_KEY
;
5224 int is_curr
= 0; /* ctx->pos points to the current index? */
5226 /* FIXME, use a real flag for deciding about the key type */
5227 if (root
->fs_info
->tree_root
== root
)
5228 key_type
= BTRFS_DIR_ITEM_KEY
;
5230 if (!dir_emit_dots(file
, ctx
))
5233 path
= btrfs_alloc_path();
5239 if (key_type
== BTRFS_DIR_INDEX_KEY
) {
5240 INIT_LIST_HEAD(&ins_list
);
5241 INIT_LIST_HEAD(&del_list
);
5242 btrfs_get_delayed_items(inode
, &ins_list
, &del_list
);
5245 btrfs_set_key_type(&key
, key_type
);
5246 key
.offset
= ctx
->pos
;
5247 key
.objectid
= btrfs_ino(inode
);
5249 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
5254 leaf
= path
->nodes
[0];
5255 slot
= path
->slots
[0];
5256 if (slot
>= btrfs_header_nritems(leaf
)) {
5257 ret
= btrfs_next_leaf(root
, path
);
5265 item
= btrfs_item_nr(slot
);
5266 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
5268 if (found_key
.objectid
!= key
.objectid
)
5270 if (btrfs_key_type(&found_key
) != key_type
)
5272 if (found_key
.offset
< ctx
->pos
)
5274 if (key_type
== BTRFS_DIR_INDEX_KEY
&&
5275 btrfs_should_delete_dir_index(&del_list
,
5279 ctx
->pos
= found_key
.offset
;
5282 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
5284 di_total
= btrfs_item_size(leaf
, item
);
5286 while (di_cur
< di_total
) {
5287 struct btrfs_key location
;
5289 if (verify_dir_item(root
, leaf
, di
))
5292 name_len
= btrfs_dir_name_len(leaf
, di
);
5293 if (name_len
<= sizeof(tmp_name
)) {
5294 name_ptr
= tmp_name
;
5296 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
5302 read_extent_buffer(leaf
, name_ptr
,
5303 (unsigned long)(di
+ 1), name_len
);
5305 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
5306 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
5309 /* is this a reference to our own snapshot? If so
5312 * In contrast to old kernels, we insert the snapshot's
5313 * dir item and dir index after it has been created, so
5314 * we won't find a reference to our own snapshot. We
5315 * still keep the following code for backward
5318 if (location
.type
== BTRFS_ROOT_ITEM_KEY
&&
5319 location
.objectid
== root
->root_key
.objectid
) {
5323 over
= !dir_emit(ctx
, name_ptr
, name_len
,
5324 location
.objectid
, d_type
);
5327 if (name_ptr
!= tmp_name
)
5332 di_len
= btrfs_dir_name_len(leaf
, di
) +
5333 btrfs_dir_data_len(leaf
, di
) + sizeof(*di
);
5335 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
5341 if (key_type
== BTRFS_DIR_INDEX_KEY
) {
5344 ret
= btrfs_readdir_delayed_dir_index(ctx
, &ins_list
);
5349 /* Reached end of directory/root. Bump pos past the last item. */
5353 * Stop new entries from being returned after we return the last
5356 * New directory entries are assigned a strictly increasing
5357 * offset. This means that new entries created during readdir
5358 * are *guaranteed* to be seen in the future by that readdir.
5359 * This has broken buggy programs which operate on names as
5360 * they're returned by readdir. Until we re-use freed offsets
5361 * we have this hack to stop new entries from being returned
5362 * under the assumption that they'll never reach this huge
5365 * This is being careful not to overflow 32bit loff_t unless the
5366 * last entry requires it because doing so has broken 32bit apps
5369 if (key_type
== BTRFS_DIR_INDEX_KEY
) {
5370 if (ctx
->pos
>= INT_MAX
)
5371 ctx
->pos
= LLONG_MAX
;
5378 if (key_type
== BTRFS_DIR_INDEX_KEY
)
5379 btrfs_put_delayed_items(&ins_list
, &del_list
);
5380 btrfs_free_path(path
);
5384 int btrfs_write_inode(struct inode
*inode
, struct writeback_control
*wbc
)
5386 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5387 struct btrfs_trans_handle
*trans
;
5389 bool nolock
= false;
5391 if (test_bit(BTRFS_INODE_DUMMY
, &BTRFS_I(inode
)->runtime_flags
))
5394 if (btrfs_fs_closing(root
->fs_info
) && btrfs_is_free_space_inode(inode
))
5397 if (wbc
->sync_mode
== WB_SYNC_ALL
) {
5399 trans
= btrfs_join_transaction_nolock(root
);
5401 trans
= btrfs_join_transaction(root
);
5403 return PTR_ERR(trans
);
5404 ret
= btrfs_commit_transaction(trans
, root
);
5410 * This is somewhat expensive, updating the tree every time the
5411 * inode changes. But, it is most likely to find the inode in cache.
5412 * FIXME, needs more benchmarking...there are no reasons other than performance
5413 * to keep or drop this code.
5415 static int btrfs_dirty_inode(struct inode
*inode
)
5417 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5418 struct btrfs_trans_handle
*trans
;
5421 if (test_bit(BTRFS_INODE_DUMMY
, &BTRFS_I(inode
)->runtime_flags
))
5424 trans
= btrfs_join_transaction(root
);
5426 return PTR_ERR(trans
);
5428 ret
= btrfs_update_inode(trans
, root
, inode
);
5429 if (ret
&& ret
== -ENOSPC
) {
5430 /* whoops, lets try again with the full transaction */
5431 btrfs_end_transaction(trans
, root
);
5432 trans
= btrfs_start_transaction(root
, 1);
5434 return PTR_ERR(trans
);
5436 ret
= btrfs_update_inode(trans
, root
, inode
);
5438 btrfs_end_transaction(trans
, root
);
5439 if (BTRFS_I(inode
)->delayed_node
)
5440 btrfs_balance_delayed_items(root
);
5446 * This is a copy of file_update_time. We need this so we can return error on
5447 * ENOSPC for updating the inode in the case of file write and mmap writes.
5449 static int btrfs_update_time(struct inode
*inode
, struct timespec
*now
,
5452 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5454 if (btrfs_root_readonly(root
))
5457 if (flags
& S_VERSION
)
5458 inode_inc_iversion(inode
);
5459 if (flags
& S_CTIME
)
5460 inode
->i_ctime
= *now
;
5461 if (flags
& S_MTIME
)
5462 inode
->i_mtime
= *now
;
5463 if (flags
& S_ATIME
)
5464 inode
->i_atime
= *now
;
5465 return btrfs_dirty_inode(inode
);
5469 * find the highest existing sequence number in a directory
5470 * and then set the in-memory index_cnt variable to reflect
5471 * free sequence numbers
5473 static int btrfs_set_inode_index_count(struct inode
*inode
)
5475 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5476 struct btrfs_key key
, found_key
;
5477 struct btrfs_path
*path
;
5478 struct extent_buffer
*leaf
;
5481 key
.objectid
= btrfs_ino(inode
);
5482 btrfs_set_key_type(&key
, BTRFS_DIR_INDEX_KEY
);
5483 key
.offset
= (u64
)-1;
5485 path
= btrfs_alloc_path();
5489 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
5492 /* FIXME: we should be able to handle this */
5498 * MAGIC NUMBER EXPLANATION:
5499 * since we search a directory based on f_pos we have to start at 2
5500 * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody
5501 * else has to start at 2
5503 if (path
->slots
[0] == 0) {
5504 BTRFS_I(inode
)->index_cnt
= 2;
5510 leaf
= path
->nodes
[0];
5511 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
5513 if (found_key
.objectid
!= btrfs_ino(inode
) ||
5514 btrfs_key_type(&found_key
) != BTRFS_DIR_INDEX_KEY
) {
5515 BTRFS_I(inode
)->index_cnt
= 2;
5519 BTRFS_I(inode
)->index_cnt
= found_key
.offset
+ 1;
5521 btrfs_free_path(path
);
5526 * helper to find a free sequence number in a given directory. This current
5527 * code is very simple, later versions will do smarter things in the btree
5529 int btrfs_set_inode_index(struct inode
*dir
, u64
*index
)
5533 if (BTRFS_I(dir
)->index_cnt
== (u64
)-1) {
5534 ret
= btrfs_inode_delayed_dir_index_count(dir
);
5536 ret
= btrfs_set_inode_index_count(dir
);
5542 *index
= BTRFS_I(dir
)->index_cnt
;
5543 BTRFS_I(dir
)->index_cnt
++;
5548 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
5549 struct btrfs_root
*root
,
5551 const char *name
, int name_len
,
5552 u64 ref_objectid
, u64 objectid
,
5553 umode_t mode
, u64
*index
)
5555 struct inode
*inode
;
5556 struct btrfs_inode_item
*inode_item
;
5557 struct btrfs_key
*location
;
5558 struct btrfs_path
*path
;
5559 struct btrfs_inode_ref
*ref
;
5560 struct btrfs_key key
[2];
5562 int nitems
= name
? 2 : 1;
5566 path
= btrfs_alloc_path();
5568 return ERR_PTR(-ENOMEM
);
5570 inode
= new_inode(root
->fs_info
->sb
);
5572 btrfs_free_path(path
);
5573 return ERR_PTR(-ENOMEM
);
5577 * we have to initialize this early, so we can reclaim the inode
5578 * number if we fail afterwards in this function.
5580 inode
->i_ino
= objectid
;
5583 trace_btrfs_inode_request(dir
);
5585 ret
= btrfs_set_inode_index(dir
, index
);
5587 btrfs_free_path(path
);
5589 return ERR_PTR(ret
);
5595 * index_cnt is ignored for everything but a dir,
5596 * btrfs_get_inode_index_count has an explanation for the magic
5599 BTRFS_I(inode
)->index_cnt
= 2;
5600 BTRFS_I(inode
)->dir_index
= *index
;
5601 BTRFS_I(inode
)->root
= root
;
5602 BTRFS_I(inode
)->generation
= trans
->transid
;
5603 inode
->i_generation
= BTRFS_I(inode
)->generation
;
5606 * We could have gotten an inode number from somebody who was fsynced
5607 * and then removed in this same transaction, so let's just set full
5608 * sync since it will be a full sync anyway and this will blow away the
5609 * old info in the log.
5611 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &BTRFS_I(inode
)->runtime_flags
);
5613 key
[0].objectid
= objectid
;
5614 btrfs_set_key_type(&key
[0], BTRFS_INODE_ITEM_KEY
);
5617 sizes
[0] = sizeof(struct btrfs_inode_item
);
5621 * Start new inodes with an inode_ref. This is slightly more
5622 * efficient for small numbers of hard links since they will
5623 * be packed into one item. Extended refs will kick in if we
5624 * add more hard links than can fit in the ref item.
5626 key
[1].objectid
= objectid
;
5627 btrfs_set_key_type(&key
[1], BTRFS_INODE_REF_KEY
);
5628 key
[1].offset
= ref_objectid
;
5630 sizes
[1] = name_len
+ sizeof(*ref
);
5633 path
->leave_spinning
= 1;
5634 ret
= btrfs_insert_empty_items(trans
, root
, path
, key
, sizes
, nitems
);
5638 inode_init_owner(inode
, dir
, mode
);
5639 inode_set_bytes(inode
, 0);
5640 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
5641 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
5642 struct btrfs_inode_item
);
5643 memset_extent_buffer(path
->nodes
[0], 0, (unsigned long)inode_item
,
5644 sizeof(*inode_item
));
5645 fill_inode_item(trans
, path
->nodes
[0], inode_item
, inode
);
5648 ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0] + 1,
5649 struct btrfs_inode_ref
);
5650 btrfs_set_inode_ref_name_len(path
->nodes
[0], ref
, name_len
);
5651 btrfs_set_inode_ref_index(path
->nodes
[0], ref
, *index
);
5652 ptr
= (unsigned long)(ref
+ 1);
5653 write_extent_buffer(path
->nodes
[0], name
, ptr
, name_len
);
5656 btrfs_mark_buffer_dirty(path
->nodes
[0]);
5657 btrfs_free_path(path
);
5659 location
= &BTRFS_I(inode
)->location
;
5660 location
->objectid
= objectid
;
5661 location
->offset
= 0;
5662 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
5664 btrfs_inherit_iflags(inode
, dir
);
5666 if (S_ISREG(mode
)) {
5667 if (btrfs_test_opt(root
, NODATASUM
))
5668 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATASUM
;
5669 if (btrfs_test_opt(root
, NODATACOW
))
5670 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATACOW
|
5671 BTRFS_INODE_NODATASUM
;
5674 btrfs_insert_inode_hash(inode
);
5675 inode_tree_add(inode
);
5677 trace_btrfs_inode_new(inode
);
5678 btrfs_set_inode_last_trans(trans
, inode
);
5680 btrfs_update_root_times(trans
, root
);
5682 ret
= btrfs_inode_inherit_props(trans
, inode
, dir
);
5684 btrfs_err(root
->fs_info
,
5685 "error inheriting props for ino %llu (root %llu): %d",
5686 btrfs_ino(inode
), root
->root_key
.objectid
, ret
);
5691 BTRFS_I(dir
)->index_cnt
--;
5692 btrfs_free_path(path
);
5694 return ERR_PTR(ret
);
5697 static inline u8
btrfs_inode_type(struct inode
*inode
)
5699 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
5703 * utility function to add 'inode' into 'parent_inode' with
5704 * a give name and a given sequence number.
5705 * if 'add_backref' is true, also insert a backref from the
5706 * inode to the parent directory.
5708 int btrfs_add_link(struct btrfs_trans_handle
*trans
,
5709 struct inode
*parent_inode
, struct inode
*inode
,
5710 const char *name
, int name_len
, int add_backref
, u64 index
)
5713 struct btrfs_key key
;
5714 struct btrfs_root
*root
= BTRFS_I(parent_inode
)->root
;
5715 u64 ino
= btrfs_ino(inode
);
5716 u64 parent_ino
= btrfs_ino(parent_inode
);
5718 if (unlikely(ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
5719 memcpy(&key
, &BTRFS_I(inode
)->root
->root_key
, sizeof(key
));
5722 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
5726 if (unlikely(ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
5727 ret
= btrfs_add_root_ref(trans
, root
->fs_info
->tree_root
,
5728 key
.objectid
, root
->root_key
.objectid
,
5729 parent_ino
, index
, name
, name_len
);
5730 } else if (add_backref
) {
5731 ret
= btrfs_insert_inode_ref(trans
, root
, name
, name_len
, ino
,
5735 /* Nothing to clean up yet */
5739 ret
= btrfs_insert_dir_item(trans
, root
, name
, name_len
,
5741 btrfs_inode_type(inode
), index
);
5742 if (ret
== -EEXIST
|| ret
== -EOVERFLOW
)
5745 btrfs_abort_transaction(trans
, root
, ret
);
5749 btrfs_i_size_write(parent_inode
, parent_inode
->i_size
+
5751 inode_inc_iversion(parent_inode
);
5752 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
5753 ret
= btrfs_update_inode(trans
, root
, parent_inode
);
5755 btrfs_abort_transaction(trans
, root
, ret
);
5759 if (unlikely(ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
5762 err
= btrfs_del_root_ref(trans
, root
->fs_info
->tree_root
,
5763 key
.objectid
, root
->root_key
.objectid
,
5764 parent_ino
, &local_index
, name
, name_len
);
5766 } else if (add_backref
) {
5770 err
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
5771 ino
, parent_ino
, &local_index
);
5776 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
5777 struct inode
*dir
, struct dentry
*dentry
,
5778 struct inode
*inode
, int backref
, u64 index
)
5780 int err
= btrfs_add_link(trans
, dir
, inode
,
5781 dentry
->d_name
.name
, dentry
->d_name
.len
,
5788 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
5789 umode_t mode
, dev_t rdev
)
5791 struct btrfs_trans_handle
*trans
;
5792 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
5793 struct inode
*inode
= NULL
;
5799 if (!new_valid_dev(rdev
))
5803 * 2 for inode item and ref
5805 * 1 for xattr if selinux is on
5807 trans
= btrfs_start_transaction(root
, 5);
5809 return PTR_ERR(trans
);
5811 err
= btrfs_find_free_ino(root
, &objectid
);
5815 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
5816 dentry
->d_name
.len
, btrfs_ino(dir
), objectid
,
5818 if (IS_ERR(inode
)) {
5819 err
= PTR_ERR(inode
);
5823 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
5830 * If the active LSM wants to access the inode during
5831 * d_instantiate it needs these. Smack checks to see
5832 * if the filesystem supports xattrs by looking at the
5836 inode
->i_op
= &btrfs_special_inode_operations
;
5837 err
= btrfs_add_nondir(trans
, dir
, dentry
, inode
, 0, index
);
5841 init_special_inode(inode
, inode
->i_mode
, rdev
);
5842 btrfs_update_inode(trans
, root
, inode
);
5843 d_instantiate(dentry
, inode
);
5846 btrfs_end_transaction(trans
, root
);
5847 btrfs_balance_delayed_items(root
);
5848 btrfs_btree_balance_dirty(root
);
5850 inode_dec_link_count(inode
);
5856 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
5857 umode_t mode
, bool excl
)
5859 struct btrfs_trans_handle
*trans
;
5860 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
5861 struct inode
*inode
= NULL
;
5862 int drop_inode_on_err
= 0;
5868 * 2 for inode item and ref
5870 * 1 for xattr if selinux is on
5872 trans
= btrfs_start_transaction(root
, 5);
5874 return PTR_ERR(trans
);
5876 err
= btrfs_find_free_ino(root
, &objectid
);
5880 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
5881 dentry
->d_name
.len
, btrfs_ino(dir
), objectid
,
5883 if (IS_ERR(inode
)) {
5884 err
= PTR_ERR(inode
);
5887 drop_inode_on_err
= 1;
5889 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
5893 err
= btrfs_update_inode(trans
, root
, inode
);
5898 * If the active LSM wants to access the inode during
5899 * d_instantiate it needs these. Smack checks to see
5900 * if the filesystem supports xattrs by looking at the
5903 inode
->i_fop
= &btrfs_file_operations
;
5904 inode
->i_op
= &btrfs_file_inode_operations
;
5906 err
= btrfs_add_nondir(trans
, dir
, dentry
, inode
, 0, index
);
5910 inode
->i_mapping
->a_ops
= &btrfs_aops
;
5911 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
5912 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
5913 d_instantiate(dentry
, inode
);
5916 btrfs_end_transaction(trans
, root
);
5917 if (err
&& drop_inode_on_err
) {
5918 inode_dec_link_count(inode
);
5921 btrfs_balance_delayed_items(root
);
5922 btrfs_btree_balance_dirty(root
);
5926 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
5927 struct dentry
*dentry
)
5929 struct btrfs_trans_handle
*trans
;
5930 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
5931 struct inode
*inode
= old_dentry
->d_inode
;
5936 /* do not allow sys_link's with other subvols of the same device */
5937 if (root
->objectid
!= BTRFS_I(inode
)->root
->objectid
)
5940 if (inode
->i_nlink
>= BTRFS_LINK_MAX
)
5943 err
= btrfs_set_inode_index(dir
, &index
);
5948 * 2 items for inode and inode ref
5949 * 2 items for dir items
5950 * 1 item for parent inode
5952 trans
= btrfs_start_transaction(root
, 5);
5953 if (IS_ERR(trans
)) {
5954 err
= PTR_ERR(trans
);
5958 /* There are several dir indexes for this inode, clear the cache. */
5959 BTRFS_I(inode
)->dir_index
= 0ULL;
5961 inode_inc_iversion(inode
);
5962 inode
->i_ctime
= CURRENT_TIME
;
5964 set_bit(BTRFS_INODE_COPY_EVERYTHING
, &BTRFS_I(inode
)->runtime_flags
);
5966 err
= btrfs_add_nondir(trans
, dir
, dentry
, inode
, 1, index
);
5971 struct dentry
*parent
= dentry
->d_parent
;
5972 err
= btrfs_update_inode(trans
, root
, inode
);
5975 if (inode
->i_nlink
== 1) {
5977 * If new hard link count is 1, it's a file created
5978 * with open(2) O_TMPFILE flag.
5980 err
= btrfs_orphan_del(trans
, inode
);
5984 d_instantiate(dentry
, inode
);
5985 btrfs_log_new_name(trans
, inode
, NULL
, parent
);
5988 btrfs_end_transaction(trans
, root
);
5989 btrfs_balance_delayed_items(root
);
5992 inode_dec_link_count(inode
);
5995 btrfs_btree_balance_dirty(root
);
5999 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
6001 struct inode
*inode
= NULL
;
6002 struct btrfs_trans_handle
*trans
;
6003 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
6005 int drop_on_err
= 0;
6010 * 2 items for inode and ref
6011 * 2 items for dir items
6012 * 1 for xattr if selinux is on
6014 trans
= btrfs_start_transaction(root
, 5);
6016 return PTR_ERR(trans
);
6018 err
= btrfs_find_free_ino(root
, &objectid
);
6022 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
6023 dentry
->d_name
.len
, btrfs_ino(dir
), objectid
,
6024 S_IFDIR
| mode
, &index
);
6025 if (IS_ERR(inode
)) {
6026 err
= PTR_ERR(inode
);
6032 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
6036 inode
->i_op
= &btrfs_dir_inode_operations
;
6037 inode
->i_fop
= &btrfs_dir_file_operations
;
6039 btrfs_i_size_write(inode
, 0);
6040 err
= btrfs_update_inode(trans
, root
, inode
);
6044 err
= btrfs_add_link(trans
, dir
, inode
, dentry
->d_name
.name
,
6045 dentry
->d_name
.len
, 0, index
);
6049 d_instantiate(dentry
, inode
);
6053 btrfs_end_transaction(trans
, root
);
6056 btrfs_balance_delayed_items(root
);
6057 btrfs_btree_balance_dirty(root
);
6061 /* helper for btfs_get_extent. Given an existing extent in the tree,
6062 * and an extent that you want to insert, deal with overlap and insert
6063 * the new extent into the tree.
6065 static int merge_extent_mapping(struct extent_map_tree
*em_tree
,
6066 struct extent_map
*existing
,
6067 struct extent_map
*em
,
6068 u64 map_start
, u64 map_len
)
6072 BUG_ON(map_start
< em
->start
|| map_start
>= extent_map_end(em
));
6073 start_diff
= map_start
- em
->start
;
6074 em
->start
= map_start
;
6076 if (em
->block_start
< EXTENT_MAP_LAST_BYTE
&&
6077 !test_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
)) {
6078 em
->block_start
+= start_diff
;
6079 em
->block_len
-= start_diff
;
6081 return add_extent_mapping(em_tree
, em
, 0);
6084 static noinline
int uncompress_inline(struct btrfs_path
*path
,
6085 struct inode
*inode
, struct page
*page
,
6086 size_t pg_offset
, u64 extent_offset
,
6087 struct btrfs_file_extent_item
*item
)
6090 struct extent_buffer
*leaf
= path
->nodes
[0];
6093 unsigned long inline_size
;
6097 WARN_ON(pg_offset
!= 0);
6098 compress_type
= btrfs_file_extent_compression(leaf
, item
);
6099 max_size
= btrfs_file_extent_ram_bytes(leaf
, item
);
6100 inline_size
= btrfs_file_extent_inline_item_len(leaf
,
6101 btrfs_item_nr(path
->slots
[0]));
6102 tmp
= kmalloc(inline_size
, GFP_NOFS
);
6105 ptr
= btrfs_file_extent_inline_start(item
);
6107 read_extent_buffer(leaf
, tmp
, ptr
, inline_size
);
6109 max_size
= min_t(unsigned long, PAGE_CACHE_SIZE
, max_size
);
6110 ret
= btrfs_decompress(compress_type
, tmp
, page
,
6111 extent_offset
, inline_size
, max_size
);
6117 * a bit scary, this does extent mapping from logical file offset to the disk.
6118 * the ugly parts come from merging extents from the disk with the in-ram
6119 * representation. This gets more complex because of the data=ordered code,
6120 * where the in-ram extents might be locked pending data=ordered completion.
6122 * This also copies inline extents directly into the page.
6125 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
6126 size_t pg_offset
, u64 start
, u64 len
,
6132 u64 extent_start
= 0;
6134 u64 objectid
= btrfs_ino(inode
);
6136 struct btrfs_path
*path
= NULL
;
6137 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
6138 struct btrfs_file_extent_item
*item
;
6139 struct extent_buffer
*leaf
;
6140 struct btrfs_key found_key
;
6141 struct extent_map
*em
= NULL
;
6142 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
6143 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
6144 struct btrfs_trans_handle
*trans
= NULL
;
6148 read_lock(&em_tree
->lock
);
6149 em
= lookup_extent_mapping(em_tree
, start
, len
);
6151 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
6152 read_unlock(&em_tree
->lock
);
6155 if (em
->start
> start
|| em
->start
+ em
->len
<= start
)
6156 free_extent_map(em
);
6157 else if (em
->block_start
== EXTENT_MAP_INLINE
&& page
)
6158 free_extent_map(em
);
6162 em
= alloc_extent_map();
6167 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
6168 em
->start
= EXTENT_MAP_HOLE
;
6169 em
->orig_start
= EXTENT_MAP_HOLE
;
6171 em
->block_len
= (u64
)-1;
6174 path
= btrfs_alloc_path();
6180 * Chances are we'll be called again, so go ahead and do
6186 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
6187 objectid
, start
, trans
!= NULL
);
6194 if (path
->slots
[0] == 0)
6199 leaf
= path
->nodes
[0];
6200 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
6201 struct btrfs_file_extent_item
);
6202 /* are we inside the extent that was found? */
6203 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
6204 found_type
= btrfs_key_type(&found_key
);
6205 if (found_key
.objectid
!= objectid
||
6206 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
6208 * If we backup past the first extent we want to move forward
6209 * and see if there is an extent in front of us, otherwise we'll
6210 * say there is a hole for our whole search range which can
6217 found_type
= btrfs_file_extent_type(leaf
, item
);
6218 extent_start
= found_key
.offset
;
6219 compress_type
= btrfs_file_extent_compression(leaf
, item
);
6220 if (found_type
== BTRFS_FILE_EXTENT_REG
||
6221 found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
6222 extent_end
= extent_start
+
6223 btrfs_file_extent_num_bytes(leaf
, item
);
6224 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
6226 size
= btrfs_file_extent_inline_len(leaf
, path
->slots
[0], item
);
6227 extent_end
= ALIGN(extent_start
+ size
, root
->sectorsize
);
6230 if (start
>= extent_end
) {
6232 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
6233 ret
= btrfs_next_leaf(root
, path
);
6240 leaf
= path
->nodes
[0];
6242 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
6243 if (found_key
.objectid
!= objectid
||
6244 found_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
6246 if (start
+ len
<= found_key
.offset
)
6249 em
->orig_start
= start
;
6250 em
->len
= found_key
.offset
- start
;
6254 em
->ram_bytes
= btrfs_file_extent_ram_bytes(leaf
, item
);
6255 if (found_type
== BTRFS_FILE_EXTENT_REG
||
6256 found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
6257 em
->start
= extent_start
;
6258 em
->len
= extent_end
- extent_start
;
6259 em
->orig_start
= extent_start
-
6260 btrfs_file_extent_offset(leaf
, item
);
6261 em
->orig_block_len
= btrfs_file_extent_disk_num_bytes(leaf
,
6263 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
6265 em
->block_start
= EXTENT_MAP_HOLE
;
6268 if (compress_type
!= BTRFS_COMPRESS_NONE
) {
6269 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
6270 em
->compress_type
= compress_type
;
6271 em
->block_start
= bytenr
;
6272 em
->block_len
= em
->orig_block_len
;
6274 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
6275 em
->block_start
= bytenr
;
6276 em
->block_len
= em
->len
;
6277 if (found_type
== BTRFS_FILE_EXTENT_PREALLOC
)
6278 set_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
);
6281 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
6285 size_t extent_offset
;
6288 em
->block_start
= EXTENT_MAP_INLINE
;
6289 if (!page
|| create
) {
6290 em
->start
= extent_start
;
6291 em
->len
= extent_end
- extent_start
;
6295 size
= btrfs_file_extent_inline_len(leaf
, path
->slots
[0], item
);
6296 extent_offset
= page_offset(page
) + pg_offset
- extent_start
;
6297 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- pg_offset
,
6298 size
- extent_offset
);
6299 em
->start
= extent_start
+ extent_offset
;
6300 em
->len
= ALIGN(copy_size
, root
->sectorsize
);
6301 em
->orig_block_len
= em
->len
;
6302 em
->orig_start
= em
->start
;
6303 if (compress_type
) {
6304 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
6305 em
->compress_type
= compress_type
;
6307 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
6308 if (create
== 0 && !PageUptodate(page
)) {
6309 if (btrfs_file_extent_compression(leaf
, item
) !=
6310 BTRFS_COMPRESS_NONE
) {
6311 ret
= uncompress_inline(path
, inode
, page
,
6313 extent_offset
, item
);
6320 read_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
6322 if (pg_offset
+ copy_size
< PAGE_CACHE_SIZE
) {
6323 memset(map
+ pg_offset
+ copy_size
, 0,
6324 PAGE_CACHE_SIZE
- pg_offset
-
6329 flush_dcache_page(page
);
6330 } else if (create
&& PageUptodate(page
)) {
6334 free_extent_map(em
);
6337 btrfs_release_path(path
);
6338 trans
= btrfs_join_transaction(root
);
6341 return ERR_CAST(trans
);
6345 write_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
6348 btrfs_mark_buffer_dirty(leaf
);
6350 set_extent_uptodate(io_tree
, em
->start
,
6351 extent_map_end(em
) - 1, NULL
, GFP_NOFS
);
6354 WARN(1, KERN_ERR
"btrfs unknown found_type %d\n", found_type
);
6358 em
->orig_start
= start
;
6361 em
->block_start
= EXTENT_MAP_HOLE
;
6362 set_bit(EXTENT_FLAG_VACANCY
, &em
->flags
);
6364 btrfs_release_path(path
);
6365 if (em
->start
> start
|| extent_map_end(em
) <= start
) {
6366 btrfs_err(root
->fs_info
, "bad extent! em: [%llu %llu] passed [%llu %llu]",
6367 em
->start
, em
->len
, start
, len
);
6373 write_lock(&em_tree
->lock
);
6374 ret
= add_extent_mapping(em_tree
, em
, 0);
6375 /* it is possible that someone inserted the extent into the tree
6376 * while we had the lock dropped. It is also possible that
6377 * an overlapping map exists in the tree
6379 if (ret
== -EEXIST
) {
6380 struct extent_map
*existing
;
6384 existing
= lookup_extent_mapping(em_tree
, start
, len
);
6385 if (existing
&& (existing
->start
> start
||
6386 existing
->start
+ existing
->len
<= start
)) {
6387 free_extent_map(existing
);
6391 existing
= lookup_extent_mapping(em_tree
, em
->start
,
6394 err
= merge_extent_mapping(em_tree
, existing
,
6397 free_extent_map(existing
);
6399 free_extent_map(em
);
6404 free_extent_map(em
);
6408 free_extent_map(em
);
6413 write_unlock(&em_tree
->lock
);
6416 trace_btrfs_get_extent(root
, em
);
6419 btrfs_free_path(path
);
6421 ret
= btrfs_end_transaction(trans
, root
);
6426 free_extent_map(em
);
6427 return ERR_PTR(err
);
6429 BUG_ON(!em
); /* Error is always set */
6433 struct extent_map
*btrfs_get_extent_fiemap(struct inode
*inode
, struct page
*page
,
6434 size_t pg_offset
, u64 start
, u64 len
,
6437 struct extent_map
*em
;
6438 struct extent_map
*hole_em
= NULL
;
6439 u64 range_start
= start
;
6445 em
= btrfs_get_extent(inode
, page
, pg_offset
, start
, len
, create
);
6452 * - a pre-alloc extent,
6453 * there might actually be delalloc bytes behind it.
6455 if (em
->block_start
!= EXTENT_MAP_HOLE
&&
6456 !test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
6462 /* check to see if we've wrapped (len == -1 or similar) */
6471 /* ok, we didn't find anything, lets look for delalloc */
6472 found
= count_range_bits(&BTRFS_I(inode
)->io_tree
, &range_start
,
6473 end
, len
, EXTENT_DELALLOC
, 1);
6474 found_end
= range_start
+ found
;
6475 if (found_end
< range_start
)
6476 found_end
= (u64
)-1;
6479 * we didn't find anything useful, return
6480 * the original results from get_extent()
6482 if (range_start
> end
|| found_end
<= start
) {
6488 /* adjust the range_start to make sure it doesn't
6489 * go backwards from the start they passed in
6491 range_start
= max(start
, range_start
);
6492 found
= found_end
- range_start
;
6495 u64 hole_start
= start
;
6498 em
= alloc_extent_map();
6504 * when btrfs_get_extent can't find anything it
6505 * returns one huge hole
6507 * make sure what it found really fits our range, and
6508 * adjust to make sure it is based on the start from
6512 u64 calc_end
= extent_map_end(hole_em
);
6514 if (calc_end
<= start
|| (hole_em
->start
> end
)) {
6515 free_extent_map(hole_em
);
6518 hole_start
= max(hole_em
->start
, start
);
6519 hole_len
= calc_end
- hole_start
;
6523 if (hole_em
&& range_start
> hole_start
) {
6524 /* our hole starts before our delalloc, so we
6525 * have to return just the parts of the hole
6526 * that go until the delalloc starts
6528 em
->len
= min(hole_len
,
6529 range_start
- hole_start
);
6530 em
->start
= hole_start
;
6531 em
->orig_start
= hole_start
;
6533 * don't adjust block start at all,
6534 * it is fixed at EXTENT_MAP_HOLE
6536 em
->block_start
= hole_em
->block_start
;
6537 em
->block_len
= hole_len
;
6538 if (test_bit(EXTENT_FLAG_PREALLOC
, &hole_em
->flags
))
6539 set_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
);
6541 em
->start
= range_start
;
6543 em
->orig_start
= range_start
;
6544 em
->block_start
= EXTENT_MAP_DELALLOC
;
6545 em
->block_len
= found
;
6547 } else if (hole_em
) {
6552 free_extent_map(hole_em
);
6554 free_extent_map(em
);
6555 return ERR_PTR(err
);
6560 static struct extent_map
*btrfs_new_extent_direct(struct inode
*inode
,
6563 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
6564 struct extent_map
*em
;
6565 struct btrfs_key ins
;
6569 alloc_hint
= get_extent_allocation_hint(inode
, start
, len
);
6570 ret
= btrfs_reserve_extent(root
, len
, root
->sectorsize
, 0,
6571 alloc_hint
, &ins
, 1);
6573 return ERR_PTR(ret
);
6575 em
= create_pinned_em(inode
, start
, ins
.offset
, start
, ins
.objectid
,
6576 ins
.offset
, ins
.offset
, ins
.offset
, 0);
6578 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
);
6582 ret
= btrfs_add_ordered_extent_dio(inode
, start
, ins
.objectid
,
6583 ins
.offset
, ins
.offset
, 0);
6585 btrfs_free_reserved_extent(root
, ins
.objectid
, ins
.offset
);
6586 free_extent_map(em
);
6587 return ERR_PTR(ret
);
6594 * returns 1 when the nocow is safe, < 1 on error, 0 if the
6595 * block must be cow'd
6597 noinline
int can_nocow_extent(struct inode
*inode
, u64 offset
, u64
*len
,
6598 u64
*orig_start
, u64
*orig_block_len
,
6601 struct btrfs_trans_handle
*trans
;
6602 struct btrfs_path
*path
;
6604 struct extent_buffer
*leaf
;
6605 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
6606 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
6607 struct btrfs_file_extent_item
*fi
;
6608 struct btrfs_key key
;
6615 bool nocow
= (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
);
6617 path
= btrfs_alloc_path();
6621 ret
= btrfs_lookup_file_extent(NULL
, root
, path
, btrfs_ino(inode
),
6626 slot
= path
->slots
[0];
6629 /* can't find the item, must cow */
6636 leaf
= path
->nodes
[0];
6637 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
6638 if (key
.objectid
!= btrfs_ino(inode
) ||
6639 key
.type
!= BTRFS_EXTENT_DATA_KEY
) {
6640 /* not our file or wrong item type, must cow */
6644 if (key
.offset
> offset
) {
6645 /* Wrong offset, must cow */
6649 fi
= btrfs_item_ptr(leaf
, slot
, struct btrfs_file_extent_item
);
6650 found_type
= btrfs_file_extent_type(leaf
, fi
);
6651 if (found_type
!= BTRFS_FILE_EXTENT_REG
&&
6652 found_type
!= BTRFS_FILE_EXTENT_PREALLOC
) {
6653 /* not a regular extent, must cow */
6657 if (!nocow
&& found_type
== BTRFS_FILE_EXTENT_REG
)
6660 extent_end
= key
.offset
+ btrfs_file_extent_num_bytes(leaf
, fi
);
6661 if (extent_end
<= offset
)
6664 disk_bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
6665 if (disk_bytenr
== 0)
6668 if (btrfs_file_extent_compression(leaf
, fi
) ||
6669 btrfs_file_extent_encryption(leaf
, fi
) ||
6670 btrfs_file_extent_other_encoding(leaf
, fi
))
6673 backref_offset
= btrfs_file_extent_offset(leaf
, fi
);
6676 *orig_start
= key
.offset
- backref_offset
;
6677 *orig_block_len
= btrfs_file_extent_disk_num_bytes(leaf
, fi
);
6678 *ram_bytes
= btrfs_file_extent_ram_bytes(leaf
, fi
);
6681 if (btrfs_extent_readonly(root
, disk_bytenr
))
6684 num_bytes
= min(offset
+ *len
, extent_end
) - offset
;
6685 if (!nocow
&& found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
6688 range_end
= round_up(offset
+ num_bytes
, root
->sectorsize
) - 1;
6689 ret
= test_range_bit(io_tree
, offset
, range_end
,
6690 EXTENT_DELALLOC
, 0, NULL
);
6697 btrfs_release_path(path
);
6700 * look for other files referencing this extent, if we
6701 * find any we must cow
6703 trans
= btrfs_join_transaction(root
);
6704 if (IS_ERR(trans
)) {
6709 ret
= btrfs_cross_ref_exist(trans
, root
, btrfs_ino(inode
),
6710 key
.offset
- backref_offset
, disk_bytenr
);
6711 btrfs_end_transaction(trans
, root
);
6718 * adjust disk_bytenr and num_bytes to cover just the bytes
6719 * in this extent we are about to write. If there
6720 * are any csums in that range we have to cow in order
6721 * to keep the csums correct
6723 disk_bytenr
+= backref_offset
;
6724 disk_bytenr
+= offset
- key
.offset
;
6725 if (csum_exist_in_range(root
, disk_bytenr
, num_bytes
))
6728 * all of the above have passed, it is safe to overwrite this extent
6734 btrfs_free_path(path
);
6738 static int lock_extent_direct(struct inode
*inode
, u64 lockstart
, u64 lockend
,
6739 struct extent_state
**cached_state
, int writing
)
6741 struct btrfs_ordered_extent
*ordered
;
6745 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, lockstart
, lockend
,
6748 * We're concerned with the entire range that we're going to be
6749 * doing DIO to, so we need to make sure theres no ordered
6750 * extents in this range.
6752 ordered
= btrfs_lookup_ordered_range(inode
, lockstart
,
6753 lockend
- lockstart
+ 1);
6756 * We need to make sure there are no buffered pages in this
6757 * range either, we could have raced between the invalidate in
6758 * generic_file_direct_write and locking the extent. The
6759 * invalidate needs to happen so that reads after a write do not
6762 if (!ordered
&& (!writing
||
6763 !test_range_bit(&BTRFS_I(inode
)->io_tree
,
6764 lockstart
, lockend
, EXTENT_UPTODATE
, 0,
6768 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, lockstart
, lockend
,
6769 cached_state
, GFP_NOFS
);
6772 btrfs_start_ordered_extent(inode
, ordered
, 1);
6773 btrfs_put_ordered_extent(ordered
);
6775 /* Screw you mmap */
6776 ret
= filemap_write_and_wait_range(inode
->i_mapping
,
6783 * If we found a page that couldn't be invalidated just
6784 * fall back to buffered.
6786 ret
= invalidate_inode_pages2_range(inode
->i_mapping
,
6787 lockstart
>> PAGE_CACHE_SHIFT
,
6788 lockend
>> PAGE_CACHE_SHIFT
);
6799 static struct extent_map
*create_pinned_em(struct inode
*inode
, u64 start
,
6800 u64 len
, u64 orig_start
,
6801 u64 block_start
, u64 block_len
,
6802 u64 orig_block_len
, u64 ram_bytes
,
6805 struct extent_map_tree
*em_tree
;
6806 struct extent_map
*em
;
6807 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
6810 em_tree
= &BTRFS_I(inode
)->extent_tree
;
6811 em
= alloc_extent_map();
6813 return ERR_PTR(-ENOMEM
);
6816 em
->orig_start
= orig_start
;
6817 em
->mod_start
= start
;
6820 em
->block_len
= block_len
;
6821 em
->block_start
= block_start
;
6822 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
6823 em
->orig_block_len
= orig_block_len
;
6824 em
->ram_bytes
= ram_bytes
;
6825 em
->generation
= -1;
6826 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
6827 if (type
== BTRFS_ORDERED_PREALLOC
)
6828 set_bit(EXTENT_FLAG_FILLING
, &em
->flags
);
6831 btrfs_drop_extent_cache(inode
, em
->start
,
6832 em
->start
+ em
->len
- 1, 0);
6833 write_lock(&em_tree
->lock
);
6834 ret
= add_extent_mapping(em_tree
, em
, 1);
6835 write_unlock(&em_tree
->lock
);
6836 } while (ret
== -EEXIST
);
6839 free_extent_map(em
);
6840 return ERR_PTR(ret
);
6847 static int btrfs_get_blocks_direct(struct inode
*inode
, sector_t iblock
,
6848 struct buffer_head
*bh_result
, int create
)
6850 struct extent_map
*em
;
6851 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
6852 struct extent_state
*cached_state
= NULL
;
6853 u64 start
= iblock
<< inode
->i_blkbits
;
6854 u64 lockstart
, lockend
;
6855 u64 len
= bh_result
->b_size
;
6856 int unlock_bits
= EXTENT_LOCKED
;
6860 unlock_bits
|= EXTENT_DELALLOC
| EXTENT_DIRTY
;
6862 len
= min_t(u64
, len
, root
->sectorsize
);
6865 lockend
= start
+ len
- 1;
6868 * If this errors out it's because we couldn't invalidate pagecache for
6869 * this range and we need to fallback to buffered.
6871 if (lock_extent_direct(inode
, lockstart
, lockend
, &cached_state
, create
))
6874 em
= btrfs_get_extent(inode
, NULL
, 0, start
, len
, 0);
6881 * Ok for INLINE and COMPRESSED extents we need to fallback on buffered
6882 * io. INLINE is special, and we could probably kludge it in here, but
6883 * it's still buffered so for safety lets just fall back to the generic
6886 * For COMPRESSED we _have_ to read the entire extent in so we can
6887 * decompress it, so there will be buffering required no matter what we
6888 * do, so go ahead and fallback to buffered.
6890 * We return -ENOTBLK because thats what makes DIO go ahead and go back
6891 * to buffered IO. Don't blame me, this is the price we pay for using
6894 if (test_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
) ||
6895 em
->block_start
== EXTENT_MAP_INLINE
) {
6896 free_extent_map(em
);
6901 /* Just a good old fashioned hole, return */
6902 if (!create
&& (em
->block_start
== EXTENT_MAP_HOLE
||
6903 test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))) {
6904 free_extent_map(em
);
6909 * We don't allocate a new extent in the following cases
6911 * 1) The inode is marked as NODATACOW. In this case we'll just use the
6913 * 2) The extent is marked as PREALLOC. We're good to go here and can
6914 * just use the extent.
6918 len
= min(len
, em
->len
- (start
- em
->start
));
6919 lockstart
= start
+ len
;
6923 if (test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
) ||
6924 ((BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
) &&
6925 em
->block_start
!= EXTENT_MAP_HOLE
)) {
6928 u64 block_start
, orig_start
, orig_block_len
, ram_bytes
;
6930 if (test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
6931 type
= BTRFS_ORDERED_PREALLOC
;
6933 type
= BTRFS_ORDERED_NOCOW
;
6934 len
= min(len
, em
->len
- (start
- em
->start
));
6935 block_start
= em
->block_start
+ (start
- em
->start
);
6937 if (can_nocow_extent(inode
, start
, &len
, &orig_start
,
6938 &orig_block_len
, &ram_bytes
) == 1) {
6939 if (type
== BTRFS_ORDERED_PREALLOC
) {
6940 free_extent_map(em
);
6941 em
= create_pinned_em(inode
, start
, len
,
6950 ret
= btrfs_add_ordered_extent_dio(inode
, start
,
6951 block_start
, len
, len
, type
);
6953 free_extent_map(em
);
6961 * this will cow the extent, reset the len in case we changed
6964 len
= bh_result
->b_size
;
6965 free_extent_map(em
);
6966 em
= btrfs_new_extent_direct(inode
, start
, len
);
6971 len
= min(len
, em
->len
- (start
- em
->start
));
6973 bh_result
->b_blocknr
= (em
->block_start
+ (start
- em
->start
)) >>
6975 bh_result
->b_size
= len
;
6976 bh_result
->b_bdev
= em
->bdev
;
6977 set_buffer_mapped(bh_result
);
6979 if (!test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
6980 set_buffer_new(bh_result
);
6983 * Need to update the i_size under the extent lock so buffered
6984 * readers will get the updated i_size when we unlock.
6986 if (start
+ len
> i_size_read(inode
))
6987 i_size_write(inode
, start
+ len
);
6989 spin_lock(&BTRFS_I(inode
)->lock
);
6990 BTRFS_I(inode
)->outstanding_extents
++;
6991 spin_unlock(&BTRFS_I(inode
)->lock
);
6993 ret
= set_extent_bit(&BTRFS_I(inode
)->io_tree
, lockstart
,
6994 lockstart
+ len
- 1, EXTENT_DELALLOC
, NULL
,
6995 &cached_state
, GFP_NOFS
);
7000 * In the case of write we need to clear and unlock the entire range,
7001 * in the case of read we need to unlock only the end area that we
7002 * aren't using if there is any left over space.
7004 if (lockstart
< lockend
) {
7005 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, lockstart
,
7006 lockend
, unlock_bits
, 1, 0,
7007 &cached_state
, GFP_NOFS
);
7009 free_extent_state(cached_state
);
7012 free_extent_map(em
);
7017 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, lockstart
, lockend
,
7018 unlock_bits
, 1, 0, &cached_state
, GFP_NOFS
);
7022 static void btrfs_endio_direct_read(struct bio
*bio
, int err
)
7024 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7025 struct bio_vec
*bvec
;
7026 struct inode
*inode
= dip
->inode
;
7027 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7028 struct bio
*dio_bio
;
7029 u32
*csums
= (u32
*)dip
->csum
;
7033 start
= dip
->logical_offset
;
7034 bio_for_each_segment_all(bvec
, bio
, i
) {
7035 if (!(BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
)) {
7036 struct page
*page
= bvec
->bv_page
;
7039 unsigned long flags
;
7041 local_irq_save(flags
);
7042 kaddr
= kmap_atomic(page
);
7043 csum
= btrfs_csum_data(kaddr
+ bvec
->bv_offset
,
7044 csum
, bvec
->bv_len
);
7045 btrfs_csum_final(csum
, (char *)&csum
);
7046 kunmap_atomic(kaddr
);
7047 local_irq_restore(flags
);
7049 flush_dcache_page(bvec
->bv_page
);
7050 if (csum
!= csums
[i
]) {
7051 btrfs_err(root
->fs_info
, "csum failed ino %llu off %llu csum %u expected csum %u",
7052 btrfs_ino(inode
), start
, csum
,
7058 start
+= bvec
->bv_len
;
7061 unlock_extent(&BTRFS_I(inode
)->io_tree
, dip
->logical_offset
,
7062 dip
->logical_offset
+ dip
->bytes
- 1);
7063 dio_bio
= dip
->dio_bio
;
7067 /* If we had a csum failure make sure to clear the uptodate flag */
7069 clear_bit(BIO_UPTODATE
, &dio_bio
->bi_flags
);
7070 dio_end_io(dio_bio
, err
);
7074 static void btrfs_endio_direct_write(struct bio
*bio
, int err
)
7076 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7077 struct inode
*inode
= dip
->inode
;
7078 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7079 struct btrfs_ordered_extent
*ordered
= NULL
;
7080 u64 ordered_offset
= dip
->logical_offset
;
7081 u64 ordered_bytes
= dip
->bytes
;
7082 struct bio
*dio_bio
;
7088 ret
= btrfs_dec_test_first_ordered_pending(inode
, &ordered
,
7090 ordered_bytes
, !err
);
7094 btrfs_init_work(&ordered
->work
, finish_ordered_fn
, NULL
, NULL
);
7095 btrfs_queue_work(root
->fs_info
->endio_write_workers
,
7099 * our bio might span multiple ordered extents. If we haven't
7100 * completed the accounting for the whole dio, go back and try again
7102 if (ordered_offset
< dip
->logical_offset
+ dip
->bytes
) {
7103 ordered_bytes
= dip
->logical_offset
+ dip
->bytes
-
7109 dio_bio
= dip
->dio_bio
;
7113 /* If we had an error make sure to clear the uptodate flag */
7115 clear_bit(BIO_UPTODATE
, &dio_bio
->bi_flags
);
7116 dio_end_io(dio_bio
, err
);
7120 static int __btrfs_submit_bio_start_direct_io(struct inode
*inode
, int rw
,
7121 struct bio
*bio
, int mirror_num
,
7122 unsigned long bio_flags
, u64 offset
)
7125 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7126 ret
= btrfs_csum_one_bio(root
, inode
, bio
, offset
, 1);
7127 BUG_ON(ret
); /* -ENOMEM */
7131 static void btrfs_end_dio_bio(struct bio
*bio
, int err
)
7133 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7136 btrfs_err(BTRFS_I(dip
->inode
)->root
->fs_info
,
7137 "direct IO failed ino %llu rw %lu sector %#Lx len %u err no %d",
7138 btrfs_ino(dip
->inode
), bio
->bi_rw
,
7139 (unsigned long long)bio
->bi_iter
.bi_sector
,
7140 bio
->bi_iter
.bi_size
, err
);
7144 * before atomic variable goto zero, we must make sure
7145 * dip->errors is perceived to be set.
7147 smp_mb__before_atomic_dec();
7150 /* if there are more bios still pending for this dio, just exit */
7151 if (!atomic_dec_and_test(&dip
->pending_bios
))
7155 bio_io_error(dip
->orig_bio
);
7157 set_bit(BIO_UPTODATE
, &dip
->dio_bio
->bi_flags
);
7158 bio_endio(dip
->orig_bio
, 0);
7164 static struct bio
*btrfs_dio_bio_alloc(struct block_device
*bdev
,
7165 u64 first_sector
, gfp_t gfp_flags
)
7167 int nr_vecs
= bio_get_nr_vecs(bdev
);
7168 return btrfs_bio_alloc(bdev
, first_sector
, nr_vecs
, gfp_flags
);
7171 static inline int __btrfs_submit_dio_bio(struct bio
*bio
, struct inode
*inode
,
7172 int rw
, u64 file_offset
, int skip_sum
,
7175 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7176 int write
= rw
& REQ_WRITE
;
7177 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7181 async_submit
= !atomic_read(&BTRFS_I(inode
)->sync_writers
);
7186 ret
= btrfs_bio_wq_end_io(root
->fs_info
, bio
, 0);
7194 if (write
&& async_submit
) {
7195 ret
= btrfs_wq_submit_bio(root
->fs_info
,
7196 inode
, rw
, bio
, 0, 0,
7198 __btrfs_submit_bio_start_direct_io
,
7199 __btrfs_submit_bio_done
);
7203 * If we aren't doing async submit, calculate the csum of the
7206 ret
= btrfs_csum_one_bio(root
, inode
, bio
, file_offset
, 1);
7209 } else if (!skip_sum
) {
7210 ret
= btrfs_lookup_bio_sums_dio(root
, inode
, dip
, bio
,
7217 ret
= btrfs_map_bio(root
, rw
, bio
, 0, async_submit
);
7223 static int btrfs_submit_direct_hook(int rw
, struct btrfs_dio_private
*dip
,
7226 struct inode
*inode
= dip
->inode
;
7227 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7229 struct bio
*orig_bio
= dip
->orig_bio
;
7230 struct bio_vec
*bvec
= orig_bio
->bi_io_vec
;
7231 u64 start_sector
= orig_bio
->bi_iter
.bi_sector
;
7232 u64 file_offset
= dip
->logical_offset
;
7237 int async_submit
= 0;
7239 map_length
= orig_bio
->bi_iter
.bi_size
;
7240 ret
= btrfs_map_block(root
->fs_info
, rw
, start_sector
<< 9,
7241 &map_length
, NULL
, 0);
7247 if (map_length
>= orig_bio
->bi_iter
.bi_size
) {
7252 /* async crcs make it difficult to collect full stripe writes. */
7253 if (btrfs_get_alloc_profile(root
, 1) &
7254 (BTRFS_BLOCK_GROUP_RAID5
| BTRFS_BLOCK_GROUP_RAID6
))
7259 bio
= btrfs_dio_bio_alloc(orig_bio
->bi_bdev
, start_sector
, GFP_NOFS
);
7262 bio
->bi_private
= dip
;
7263 bio
->bi_end_io
= btrfs_end_dio_bio
;
7264 atomic_inc(&dip
->pending_bios
);
7266 while (bvec
<= (orig_bio
->bi_io_vec
+ orig_bio
->bi_vcnt
- 1)) {
7267 if (unlikely(map_length
< submit_len
+ bvec
->bv_len
||
7268 bio_add_page(bio
, bvec
->bv_page
, bvec
->bv_len
,
7269 bvec
->bv_offset
) < bvec
->bv_len
)) {
7271 * inc the count before we submit the bio so
7272 * we know the end IO handler won't happen before
7273 * we inc the count. Otherwise, the dip might get freed
7274 * before we're done setting it up
7276 atomic_inc(&dip
->pending_bios
);
7277 ret
= __btrfs_submit_dio_bio(bio
, inode
, rw
,
7278 file_offset
, skip_sum
,
7282 atomic_dec(&dip
->pending_bios
);
7286 start_sector
+= submit_len
>> 9;
7287 file_offset
+= submit_len
;
7292 bio
= btrfs_dio_bio_alloc(orig_bio
->bi_bdev
,
7293 start_sector
, GFP_NOFS
);
7296 bio
->bi_private
= dip
;
7297 bio
->bi_end_io
= btrfs_end_dio_bio
;
7299 map_length
= orig_bio
->bi_iter
.bi_size
;
7300 ret
= btrfs_map_block(root
->fs_info
, rw
,
7302 &map_length
, NULL
, 0);
7308 submit_len
+= bvec
->bv_len
;
7315 ret
= __btrfs_submit_dio_bio(bio
, inode
, rw
, file_offset
, skip_sum
,
7324 * before atomic variable goto zero, we must
7325 * make sure dip->errors is perceived to be set.
7327 smp_mb__before_atomic_dec();
7328 if (atomic_dec_and_test(&dip
->pending_bios
))
7329 bio_io_error(dip
->orig_bio
);
7331 /* bio_end_io() will handle error, so we needn't return it */
7335 static void btrfs_submit_direct(int rw
, struct bio
*dio_bio
,
7336 struct inode
*inode
, loff_t file_offset
)
7338 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7339 struct btrfs_dio_private
*dip
;
7343 int write
= rw
& REQ_WRITE
;
7347 skip_sum
= BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
;
7349 io_bio
= btrfs_bio_clone(dio_bio
, GFP_NOFS
);
7355 if (!skip_sum
&& !write
) {
7356 csum_size
= btrfs_super_csum_size(root
->fs_info
->super_copy
);
7357 sum_len
= dio_bio
->bi_iter
.bi_size
>>
7358 inode
->i_sb
->s_blocksize_bits
;
7359 sum_len
*= csum_size
;
7364 dip
= kmalloc(sizeof(*dip
) + sum_len
, GFP_NOFS
);
7370 dip
->private = dio_bio
->bi_private
;
7372 dip
->logical_offset
= file_offset
;
7373 dip
->bytes
= dio_bio
->bi_iter
.bi_size
;
7374 dip
->disk_bytenr
= (u64
)dio_bio
->bi_iter
.bi_sector
<< 9;
7375 io_bio
->bi_private
= dip
;
7377 dip
->orig_bio
= io_bio
;
7378 dip
->dio_bio
= dio_bio
;
7379 atomic_set(&dip
->pending_bios
, 0);
7382 io_bio
->bi_end_io
= btrfs_endio_direct_write
;
7384 io_bio
->bi_end_io
= btrfs_endio_direct_read
;
7386 ret
= btrfs_submit_direct_hook(rw
, dip
, skip_sum
);
7395 * If this is a write, we need to clean up the reserved space and kill
7396 * the ordered extent.
7399 struct btrfs_ordered_extent
*ordered
;
7400 ordered
= btrfs_lookup_ordered_extent(inode
, file_offset
);
7401 if (!test_bit(BTRFS_ORDERED_PREALLOC
, &ordered
->flags
) &&
7402 !test_bit(BTRFS_ORDERED_NOCOW
, &ordered
->flags
))
7403 btrfs_free_reserved_extent(root
, ordered
->start
,
7405 btrfs_put_ordered_extent(ordered
);
7406 btrfs_put_ordered_extent(ordered
);
7408 bio_endio(dio_bio
, ret
);
7411 static ssize_t
check_direct_IO(struct btrfs_root
*root
, int rw
, struct kiocb
*iocb
,
7412 const struct iovec
*iov
, loff_t offset
,
7413 unsigned long nr_segs
)
7419 unsigned blocksize_mask
= root
->sectorsize
- 1;
7420 ssize_t retval
= -EINVAL
;
7421 loff_t end
= offset
;
7423 if (offset
& blocksize_mask
)
7426 /* Check the memory alignment. Blocks cannot straddle pages */
7427 for (seg
= 0; seg
< nr_segs
; seg
++) {
7428 addr
= (unsigned long)iov
[seg
].iov_base
;
7429 size
= iov
[seg
].iov_len
;
7431 if ((addr
& blocksize_mask
) || (size
& blocksize_mask
))
7434 /* If this is a write we don't need to check anymore */
7439 * Check to make sure we don't have duplicate iov_base's in this
7440 * iovec, if so return EINVAL, otherwise we'll get csum errors
7441 * when reading back.
7443 for (i
= seg
+ 1; i
< nr_segs
; i
++) {
7444 if (iov
[seg
].iov_base
== iov
[i
].iov_base
)
7453 static ssize_t
btrfs_direct_IO(int rw
, struct kiocb
*iocb
,
7454 const struct iovec
*iov
, loff_t offset
,
7455 unsigned long nr_segs
)
7457 struct file
*file
= iocb
->ki_filp
;
7458 struct inode
*inode
= file
->f_mapping
->host
;
7462 bool relock
= false;
7465 if (check_direct_IO(BTRFS_I(inode
)->root
, rw
, iocb
, iov
,
7469 atomic_inc(&inode
->i_dio_count
);
7470 smp_mb__after_atomic_inc();
7473 * The generic stuff only does filemap_write_and_wait_range, which
7474 * isn't enough if we've written compressed pages to this area, so
7475 * we need to flush the dirty pages again to make absolutely sure
7476 * that any outstanding dirty pages are on disk.
7478 count
= iov_length(iov
, nr_segs
);
7479 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
7480 &BTRFS_I(inode
)->runtime_flags
))
7481 filemap_fdatawrite_range(inode
->i_mapping
, offset
, count
);
7485 * If the write DIO is beyond the EOF, we need update
7486 * the isize, but it is protected by i_mutex. So we can
7487 * not unlock the i_mutex at this case.
7489 if (offset
+ count
<= inode
->i_size
) {
7490 mutex_unlock(&inode
->i_mutex
);
7493 ret
= btrfs_delalloc_reserve_space(inode
, count
);
7496 } else if (unlikely(test_bit(BTRFS_INODE_READDIO_NEED_LOCK
,
7497 &BTRFS_I(inode
)->runtime_flags
))) {
7498 inode_dio_done(inode
);
7499 flags
= DIO_LOCKING
| DIO_SKIP_HOLES
;
7503 ret
= __blockdev_direct_IO(rw
, iocb
, inode
,
7504 BTRFS_I(inode
)->root
->fs_info
->fs_devices
->latest_bdev
,
7505 iov
, offset
, nr_segs
, btrfs_get_blocks_direct
, NULL
,
7506 btrfs_submit_direct
, flags
);
7508 if (ret
< 0 && ret
!= -EIOCBQUEUED
)
7509 btrfs_delalloc_release_space(inode
, count
);
7510 else if (ret
>= 0 && (size_t)ret
< count
)
7511 btrfs_delalloc_release_space(inode
,
7512 count
- (size_t)ret
);
7514 btrfs_delalloc_release_metadata(inode
, 0);
7518 inode_dio_done(inode
);
7520 mutex_lock(&inode
->i_mutex
);
7525 #define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC)
7527 static int btrfs_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
7528 __u64 start
, __u64 len
)
7532 ret
= fiemap_check_flags(fieinfo
, BTRFS_FIEMAP_FLAGS
);
7536 return extent_fiemap(inode
, fieinfo
, start
, len
, btrfs_get_extent_fiemap
);
7539 int btrfs_readpage(struct file
*file
, struct page
*page
)
7541 struct extent_io_tree
*tree
;
7542 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
7543 return extent_read_full_page(tree
, page
, btrfs_get_extent
, 0);
7546 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
7548 struct extent_io_tree
*tree
;
7551 if (current
->flags
& PF_MEMALLOC
) {
7552 redirty_page_for_writepage(wbc
, page
);
7556 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
7557 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
7560 static int btrfs_writepages(struct address_space
*mapping
,
7561 struct writeback_control
*wbc
)
7563 struct extent_io_tree
*tree
;
7565 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
7566 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
7570 btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
7571 struct list_head
*pages
, unsigned nr_pages
)
7573 struct extent_io_tree
*tree
;
7574 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
7575 return extent_readpages(tree
, mapping
, pages
, nr_pages
,
7578 static int __btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
7580 struct extent_io_tree
*tree
;
7581 struct extent_map_tree
*map
;
7584 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
7585 map
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
7586 ret
= try_release_extent_mapping(map
, tree
, page
, gfp_flags
);
7588 ClearPagePrivate(page
);
7589 set_page_private(page
, 0);
7590 page_cache_release(page
);
7595 static int btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
7597 if (PageWriteback(page
) || PageDirty(page
))
7599 return __btrfs_releasepage(page
, gfp_flags
& GFP_NOFS
);
7602 static void btrfs_invalidatepage(struct page
*page
, unsigned int offset
,
7603 unsigned int length
)
7605 struct inode
*inode
= page
->mapping
->host
;
7606 struct extent_io_tree
*tree
;
7607 struct btrfs_ordered_extent
*ordered
;
7608 struct extent_state
*cached_state
= NULL
;
7609 u64 page_start
= page_offset(page
);
7610 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
7611 int inode_evicting
= inode
->i_state
& I_FREEING
;
7614 * we have the page locked, so new writeback can't start,
7615 * and the dirty bit won't be cleared while we are here.
7617 * Wait for IO on this page so that we can safely clear
7618 * the PagePrivate2 bit and do ordered accounting
7620 wait_on_page_writeback(page
);
7622 tree
= &BTRFS_I(inode
)->io_tree
;
7624 btrfs_releasepage(page
, GFP_NOFS
);
7628 if (!inode_evicting
)
7629 lock_extent_bits(tree
, page_start
, page_end
, 0, &cached_state
);
7630 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
7633 * IO on this page will never be started, so we need
7634 * to account for any ordered extents now
7636 if (!inode_evicting
)
7637 clear_extent_bit(tree
, page_start
, page_end
,
7638 EXTENT_DIRTY
| EXTENT_DELALLOC
|
7639 EXTENT_LOCKED
| EXTENT_DO_ACCOUNTING
|
7640 EXTENT_DEFRAG
, 1, 0, &cached_state
,
7643 * whoever cleared the private bit is responsible
7644 * for the finish_ordered_io
7646 if (TestClearPagePrivate2(page
)) {
7647 struct btrfs_ordered_inode_tree
*tree
;
7650 tree
= &BTRFS_I(inode
)->ordered_tree
;
7652 spin_lock_irq(&tree
->lock
);
7653 set_bit(BTRFS_ORDERED_TRUNCATED
, &ordered
->flags
);
7654 new_len
= page_start
- ordered
->file_offset
;
7655 if (new_len
< ordered
->truncated_len
)
7656 ordered
->truncated_len
= new_len
;
7657 spin_unlock_irq(&tree
->lock
);
7659 if (btrfs_dec_test_ordered_pending(inode
, &ordered
,
7661 PAGE_CACHE_SIZE
, 1))
7662 btrfs_finish_ordered_io(ordered
);
7664 btrfs_put_ordered_extent(ordered
);
7665 if (!inode_evicting
) {
7666 cached_state
= NULL
;
7667 lock_extent_bits(tree
, page_start
, page_end
, 0,
7672 if (!inode_evicting
) {
7673 clear_extent_bit(tree
, page_start
, page_end
,
7674 EXTENT_LOCKED
| EXTENT_DIRTY
|
7675 EXTENT_DELALLOC
| EXTENT_DO_ACCOUNTING
|
7676 EXTENT_DEFRAG
, 1, 1,
7677 &cached_state
, GFP_NOFS
);
7679 __btrfs_releasepage(page
, GFP_NOFS
);
7682 ClearPageChecked(page
);
7683 if (PagePrivate(page
)) {
7684 ClearPagePrivate(page
);
7685 set_page_private(page
, 0);
7686 page_cache_release(page
);
7691 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
7692 * called from a page fault handler when a page is first dirtied. Hence we must
7693 * be careful to check for EOF conditions here. We set the page up correctly
7694 * for a written page which means we get ENOSPC checking when writing into
7695 * holes and correct delalloc and unwritten extent mapping on filesystems that
7696 * support these features.
7698 * We are not allowed to take the i_mutex here so we have to play games to
7699 * protect against truncate races as the page could now be beyond EOF. Because
7700 * vmtruncate() writes the inode size before removing pages, once we have the
7701 * page lock we can determine safely if the page is beyond EOF. If it is not
7702 * beyond EOF, then the page is guaranteed safe against truncation until we
7705 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
7707 struct page
*page
= vmf
->page
;
7708 struct inode
*inode
= file_inode(vma
->vm_file
);
7709 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7710 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
7711 struct btrfs_ordered_extent
*ordered
;
7712 struct extent_state
*cached_state
= NULL
;
7714 unsigned long zero_start
;
7721 sb_start_pagefault(inode
->i_sb
);
7722 ret
= btrfs_delalloc_reserve_space(inode
, PAGE_CACHE_SIZE
);
7724 ret
= file_update_time(vma
->vm_file
);
7730 else /* -ENOSPC, -EIO, etc */
7731 ret
= VM_FAULT_SIGBUS
;
7737 ret
= VM_FAULT_NOPAGE
; /* make the VM retry the fault */
7740 size
= i_size_read(inode
);
7741 page_start
= page_offset(page
);
7742 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
7744 if ((page
->mapping
!= inode
->i_mapping
) ||
7745 (page_start
>= size
)) {
7746 /* page got truncated out from underneath us */
7749 wait_on_page_writeback(page
);
7751 lock_extent_bits(io_tree
, page_start
, page_end
, 0, &cached_state
);
7752 set_page_extent_mapped(page
);
7755 * we can't set the delalloc bits if there are pending ordered
7756 * extents. Drop our locks and wait for them to finish
7758 ordered
= btrfs_lookup_ordered_extent(inode
, page_start
);
7760 unlock_extent_cached(io_tree
, page_start
, page_end
,
7761 &cached_state
, GFP_NOFS
);
7763 btrfs_start_ordered_extent(inode
, ordered
, 1);
7764 btrfs_put_ordered_extent(ordered
);
7769 * XXX - page_mkwrite gets called every time the page is dirtied, even
7770 * if it was already dirty, so for space accounting reasons we need to
7771 * clear any delalloc bits for the range we are fixing to save. There
7772 * is probably a better way to do this, but for now keep consistent with
7773 * prepare_pages in the normal write path.
7775 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
, page_end
,
7776 EXTENT_DIRTY
| EXTENT_DELALLOC
|
7777 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
,
7778 0, 0, &cached_state
, GFP_NOFS
);
7780 ret
= btrfs_set_extent_delalloc(inode
, page_start
, page_end
,
7783 unlock_extent_cached(io_tree
, page_start
, page_end
,
7784 &cached_state
, GFP_NOFS
);
7785 ret
= VM_FAULT_SIGBUS
;
7790 /* page is wholly or partially inside EOF */
7791 if (page_start
+ PAGE_CACHE_SIZE
> size
)
7792 zero_start
= size
& ~PAGE_CACHE_MASK
;
7794 zero_start
= PAGE_CACHE_SIZE
;
7796 if (zero_start
!= PAGE_CACHE_SIZE
) {
7798 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
7799 flush_dcache_page(page
);
7802 ClearPageChecked(page
);
7803 set_page_dirty(page
);
7804 SetPageUptodate(page
);
7806 BTRFS_I(inode
)->last_trans
= root
->fs_info
->generation
;
7807 BTRFS_I(inode
)->last_sub_trans
= BTRFS_I(inode
)->root
->log_transid
;
7808 BTRFS_I(inode
)->last_log_commit
= BTRFS_I(inode
)->root
->last_log_commit
;
7810 unlock_extent_cached(io_tree
, page_start
, page_end
, &cached_state
, GFP_NOFS
);
7814 sb_end_pagefault(inode
->i_sb
);
7815 return VM_FAULT_LOCKED
;
7819 btrfs_delalloc_release_space(inode
, PAGE_CACHE_SIZE
);
7821 sb_end_pagefault(inode
->i_sb
);
7825 static int btrfs_truncate(struct inode
*inode
)
7827 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
7828 struct btrfs_block_rsv
*rsv
;
7831 struct btrfs_trans_handle
*trans
;
7832 u64 mask
= root
->sectorsize
- 1;
7833 u64 min_size
= btrfs_calc_trunc_metadata_size(root
, 1);
7835 ret
= btrfs_wait_ordered_range(inode
, inode
->i_size
& (~mask
),
7841 * Yes ladies and gentelment, this is indeed ugly. The fact is we have
7842 * 3 things going on here
7844 * 1) We need to reserve space for our orphan item and the space to
7845 * delete our orphan item. Lord knows we don't want to have a dangling
7846 * orphan item because we didn't reserve space to remove it.
7848 * 2) We need to reserve space to update our inode.
7850 * 3) We need to have something to cache all the space that is going to
7851 * be free'd up by the truncate operation, but also have some slack
7852 * space reserved in case it uses space during the truncate (thank you
7853 * very much snapshotting).
7855 * And we need these to all be seperate. The fact is we can use alot of
7856 * space doing the truncate, and we have no earthly idea how much space
7857 * we will use, so we need the truncate reservation to be seperate so it
7858 * doesn't end up using space reserved for updating the inode or
7859 * removing the orphan item. We also need to be able to stop the
7860 * transaction and start a new one, which means we need to be able to
7861 * update the inode several times, and we have no idea of knowing how
7862 * many times that will be, so we can't just reserve 1 item for the
7863 * entirety of the opration, so that has to be done seperately as well.
7864 * Then there is the orphan item, which does indeed need to be held on
7865 * to for the whole operation, and we need nobody to touch this reserved
7866 * space except the orphan code.
7868 * So that leaves us with
7870 * 1) root->orphan_block_rsv - for the orphan deletion.
7871 * 2) rsv - for the truncate reservation, which we will steal from the
7872 * transaction reservation.
7873 * 3) fs_info->trans_block_rsv - this will have 1 items worth left for
7874 * updating the inode.
7876 rsv
= btrfs_alloc_block_rsv(root
, BTRFS_BLOCK_RSV_TEMP
);
7879 rsv
->size
= min_size
;
7883 * 1 for the truncate slack space
7884 * 1 for updating the inode.
7886 trans
= btrfs_start_transaction(root
, 2);
7887 if (IS_ERR(trans
)) {
7888 err
= PTR_ERR(trans
);
7892 /* Migrate the slack space for the truncate to our reserve */
7893 ret
= btrfs_block_rsv_migrate(&root
->fs_info
->trans_block_rsv
, rsv
,
7898 * setattr is responsible for setting the ordered_data_close flag,
7899 * but that is only tested during the last file release. That
7900 * could happen well after the next commit, leaving a great big
7901 * window where new writes may get lost if someone chooses to write
7902 * to this file after truncating to zero
7904 * The inode doesn't have any dirty data here, and so if we commit
7905 * this is a noop. If someone immediately starts writing to the inode
7906 * it is very likely we'll catch some of their writes in this
7907 * transaction, and the commit will find this file on the ordered
7908 * data list with good things to send down.
7910 * This is a best effort solution, there is still a window where
7911 * using truncate to replace the contents of the file will
7912 * end up with a zero length file after a crash.
7914 if (inode
->i_size
== 0 && test_bit(BTRFS_INODE_ORDERED_DATA_CLOSE
,
7915 &BTRFS_I(inode
)->runtime_flags
))
7916 btrfs_add_ordered_operation(trans
, root
, inode
);
7919 * So if we truncate and then write and fsync we normally would just
7920 * write the extents that changed, which is a problem if we need to
7921 * first truncate that entire inode. So set this flag so we write out
7922 * all of the extents in the inode to the sync log so we're completely
7925 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &BTRFS_I(inode
)->runtime_flags
);
7926 trans
->block_rsv
= rsv
;
7929 ret
= btrfs_truncate_inode_items(trans
, root
, inode
,
7931 BTRFS_EXTENT_DATA_KEY
);
7932 if (ret
!= -ENOSPC
) {
7937 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
7938 ret
= btrfs_update_inode(trans
, root
, inode
);
7944 btrfs_end_transaction(trans
, root
);
7945 btrfs_btree_balance_dirty(root
);
7947 trans
= btrfs_start_transaction(root
, 2);
7948 if (IS_ERR(trans
)) {
7949 ret
= err
= PTR_ERR(trans
);
7954 ret
= btrfs_block_rsv_migrate(&root
->fs_info
->trans_block_rsv
,
7956 BUG_ON(ret
); /* shouldn't happen */
7957 trans
->block_rsv
= rsv
;
7960 if (ret
== 0 && inode
->i_nlink
> 0) {
7961 trans
->block_rsv
= root
->orphan_block_rsv
;
7962 ret
= btrfs_orphan_del(trans
, inode
);
7968 trans
->block_rsv
= &root
->fs_info
->trans_block_rsv
;
7969 ret
= btrfs_update_inode(trans
, root
, inode
);
7973 ret
= btrfs_end_transaction(trans
, root
);
7974 btrfs_btree_balance_dirty(root
);
7978 btrfs_free_block_rsv(root
, rsv
);
7987 * create a new subvolume directory/inode (helper for the ioctl).
7989 int btrfs_create_subvol_root(struct btrfs_trans_handle
*trans
,
7990 struct btrfs_root
*new_root
,
7991 struct btrfs_root
*parent_root
,
7994 struct inode
*inode
;
7998 inode
= btrfs_new_inode(trans
, new_root
, NULL
, "..", 2,
7999 new_dirid
, new_dirid
,
8000 S_IFDIR
| (~current_umask() & S_IRWXUGO
),
8003 return PTR_ERR(inode
);
8004 inode
->i_op
= &btrfs_dir_inode_operations
;
8005 inode
->i_fop
= &btrfs_dir_file_operations
;
8007 set_nlink(inode
, 1);
8008 btrfs_i_size_write(inode
, 0);
8010 err
= btrfs_subvol_inherit_props(trans
, new_root
, parent_root
);
8012 btrfs_err(new_root
->fs_info
,
8013 "error inheriting subvolume %llu properties: %d\n",
8014 new_root
->root_key
.objectid
, err
);
8016 err
= btrfs_update_inode(trans
, new_root
, inode
);
8022 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
8024 struct btrfs_inode
*ei
;
8025 struct inode
*inode
;
8027 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
8034 ei
->last_sub_trans
= 0;
8035 ei
->logged_trans
= 0;
8036 ei
->delalloc_bytes
= 0;
8037 ei
->disk_i_size
= 0;
8040 ei
->index_cnt
= (u64
)-1;
8042 ei
->last_unlink_trans
= 0;
8043 ei
->last_log_commit
= 0;
8045 spin_lock_init(&ei
->lock
);
8046 ei
->outstanding_extents
= 0;
8047 ei
->reserved_extents
= 0;
8049 ei
->runtime_flags
= 0;
8050 ei
->force_compress
= BTRFS_COMPRESS_NONE
;
8052 ei
->delayed_node
= NULL
;
8054 inode
= &ei
->vfs_inode
;
8055 extent_map_tree_init(&ei
->extent_tree
);
8056 extent_io_tree_init(&ei
->io_tree
, &inode
->i_data
);
8057 extent_io_tree_init(&ei
->io_failure_tree
, &inode
->i_data
);
8058 ei
->io_tree
.track_uptodate
= 1;
8059 ei
->io_failure_tree
.track_uptodate
= 1;
8060 atomic_set(&ei
->sync_writers
, 0);
8061 mutex_init(&ei
->log_mutex
);
8062 mutex_init(&ei
->delalloc_mutex
);
8063 btrfs_ordered_inode_tree_init(&ei
->ordered_tree
);
8064 INIT_LIST_HEAD(&ei
->delalloc_inodes
);
8065 INIT_LIST_HEAD(&ei
->ordered_operations
);
8066 RB_CLEAR_NODE(&ei
->rb_node
);
8071 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
8072 void btrfs_test_destroy_inode(struct inode
*inode
)
8074 btrfs_drop_extent_cache(inode
, 0, (u64
)-1, 0);
8075 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
8079 static void btrfs_i_callback(struct rcu_head
*head
)
8081 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
8082 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
8085 void btrfs_destroy_inode(struct inode
*inode
)
8087 struct btrfs_ordered_extent
*ordered
;
8088 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8090 WARN_ON(!hlist_empty(&inode
->i_dentry
));
8091 WARN_ON(inode
->i_data
.nrpages
);
8092 WARN_ON(BTRFS_I(inode
)->outstanding_extents
);
8093 WARN_ON(BTRFS_I(inode
)->reserved_extents
);
8094 WARN_ON(BTRFS_I(inode
)->delalloc_bytes
);
8095 WARN_ON(BTRFS_I(inode
)->csum_bytes
);
8098 * This can happen where we create an inode, but somebody else also
8099 * created the same inode and we need to destroy the one we already
8106 * Make sure we're properly removed from the ordered operation
8110 if (!list_empty(&BTRFS_I(inode
)->ordered_operations
)) {
8111 spin_lock(&root
->fs_info
->ordered_root_lock
);
8112 list_del_init(&BTRFS_I(inode
)->ordered_operations
);
8113 spin_unlock(&root
->fs_info
->ordered_root_lock
);
8116 if (test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM
,
8117 &BTRFS_I(inode
)->runtime_flags
)) {
8118 btrfs_info(root
->fs_info
, "inode %llu still on the orphan list",
8120 atomic_dec(&root
->orphan_inodes
);
8124 ordered
= btrfs_lookup_first_ordered_extent(inode
, (u64
)-1);
8128 btrfs_err(root
->fs_info
, "found ordered extent %llu %llu on inode cleanup",
8129 ordered
->file_offset
, ordered
->len
);
8130 btrfs_remove_ordered_extent(inode
, ordered
);
8131 btrfs_put_ordered_extent(ordered
);
8132 btrfs_put_ordered_extent(ordered
);
8135 inode_tree_del(inode
);
8136 btrfs_drop_extent_cache(inode
, 0, (u64
)-1, 0);
8138 call_rcu(&inode
->i_rcu
, btrfs_i_callback
);
8141 int btrfs_drop_inode(struct inode
*inode
)
8143 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8148 /* the snap/subvol tree is on deleting */
8149 if (btrfs_root_refs(&root
->root_item
) == 0)
8152 return generic_drop_inode(inode
);
8155 static void init_once(void *foo
)
8157 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
8159 inode_init_once(&ei
->vfs_inode
);
8162 void btrfs_destroy_cachep(void)
8165 * Make sure all delayed rcu free inodes are flushed before we
8169 if (btrfs_inode_cachep
)
8170 kmem_cache_destroy(btrfs_inode_cachep
);
8171 if (btrfs_trans_handle_cachep
)
8172 kmem_cache_destroy(btrfs_trans_handle_cachep
);
8173 if (btrfs_transaction_cachep
)
8174 kmem_cache_destroy(btrfs_transaction_cachep
);
8175 if (btrfs_path_cachep
)
8176 kmem_cache_destroy(btrfs_path_cachep
);
8177 if (btrfs_free_space_cachep
)
8178 kmem_cache_destroy(btrfs_free_space_cachep
);
8179 if (btrfs_delalloc_work_cachep
)
8180 kmem_cache_destroy(btrfs_delalloc_work_cachep
);
8183 int btrfs_init_cachep(void)
8185 btrfs_inode_cachep
= kmem_cache_create("btrfs_inode",
8186 sizeof(struct btrfs_inode
), 0,
8187 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, init_once
);
8188 if (!btrfs_inode_cachep
)
8191 btrfs_trans_handle_cachep
= kmem_cache_create("btrfs_trans_handle",
8192 sizeof(struct btrfs_trans_handle
), 0,
8193 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, NULL
);
8194 if (!btrfs_trans_handle_cachep
)
8197 btrfs_transaction_cachep
= kmem_cache_create("btrfs_transaction",
8198 sizeof(struct btrfs_transaction
), 0,
8199 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, NULL
);
8200 if (!btrfs_transaction_cachep
)
8203 btrfs_path_cachep
= kmem_cache_create("btrfs_path",
8204 sizeof(struct btrfs_path
), 0,
8205 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, NULL
);
8206 if (!btrfs_path_cachep
)
8209 btrfs_free_space_cachep
= kmem_cache_create("btrfs_free_space",
8210 sizeof(struct btrfs_free_space
), 0,
8211 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
, NULL
);
8212 if (!btrfs_free_space_cachep
)
8215 btrfs_delalloc_work_cachep
= kmem_cache_create("btrfs_delalloc_work",
8216 sizeof(struct btrfs_delalloc_work
), 0,
8217 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
,
8219 if (!btrfs_delalloc_work_cachep
)
8224 btrfs_destroy_cachep();
8228 static int btrfs_getattr(struct vfsmount
*mnt
,
8229 struct dentry
*dentry
, struct kstat
*stat
)
8232 struct inode
*inode
= dentry
->d_inode
;
8233 u32 blocksize
= inode
->i_sb
->s_blocksize
;
8235 generic_fillattr(inode
, stat
);
8236 stat
->dev
= BTRFS_I(inode
)->root
->anon_dev
;
8237 stat
->blksize
= PAGE_CACHE_SIZE
;
8239 spin_lock(&BTRFS_I(inode
)->lock
);
8240 delalloc_bytes
= BTRFS_I(inode
)->delalloc_bytes
;
8241 spin_unlock(&BTRFS_I(inode
)->lock
);
8242 stat
->blocks
= (ALIGN(inode_get_bytes(inode
), blocksize
) +
8243 ALIGN(delalloc_bytes
, blocksize
)) >> 9;
8247 static int btrfs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
8248 struct inode
*new_dir
, struct dentry
*new_dentry
)
8250 struct btrfs_trans_handle
*trans
;
8251 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
8252 struct btrfs_root
*dest
= BTRFS_I(new_dir
)->root
;
8253 struct inode
*new_inode
= new_dentry
->d_inode
;
8254 struct inode
*old_inode
= old_dentry
->d_inode
;
8255 struct timespec ctime
= CURRENT_TIME
;
8259 u64 old_ino
= btrfs_ino(old_inode
);
8261 if (btrfs_ino(new_dir
) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)
8264 /* we only allow rename subvolume link between subvolumes */
8265 if (old_ino
!= BTRFS_FIRST_FREE_OBJECTID
&& root
!= dest
)
8268 if (old_ino
== BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
||
8269 (new_inode
&& btrfs_ino(new_inode
) == BTRFS_FIRST_FREE_OBJECTID
))
8272 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
8273 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
8277 /* check for collisions, even if the name isn't there */
8278 ret
= btrfs_check_dir_item_collision(dest
, new_dir
->i_ino
,
8279 new_dentry
->d_name
.name
,
8280 new_dentry
->d_name
.len
);
8283 if (ret
== -EEXIST
) {
8285 * eexist without a new_inode */
8286 if (WARN_ON(!new_inode
)) {
8290 /* maybe -EOVERFLOW */
8297 * we're using rename to replace one file with another.
8298 * and the replacement file is large. Start IO on it now so
8299 * we don't add too much work to the end of the transaction
8301 if (new_inode
&& S_ISREG(old_inode
->i_mode
) && new_inode
->i_size
&&
8302 old_inode
->i_size
> BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT
)
8303 filemap_flush(old_inode
->i_mapping
);
8305 /* close the racy window with snapshot create/destroy ioctl */
8306 if (old_ino
== BTRFS_FIRST_FREE_OBJECTID
)
8307 down_read(&root
->fs_info
->subvol_sem
);
8309 * We want to reserve the absolute worst case amount of items. So if
8310 * both inodes are subvols and we need to unlink them then that would
8311 * require 4 item modifications, but if they are both normal inodes it
8312 * would require 5 item modifications, so we'll assume their normal
8313 * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items
8314 * should cover the worst case number of items we'll modify.
8316 trans
= btrfs_start_transaction(root
, 11);
8317 if (IS_ERR(trans
)) {
8318 ret
= PTR_ERR(trans
);
8323 btrfs_record_root_in_trans(trans
, dest
);
8325 ret
= btrfs_set_inode_index(new_dir
, &index
);
8329 BTRFS_I(old_inode
)->dir_index
= 0ULL;
8330 if (unlikely(old_ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
8331 /* force full log commit if subvolume involved. */
8332 btrfs_set_log_full_commit(root
->fs_info
, trans
);
8334 ret
= btrfs_insert_inode_ref(trans
, dest
,
8335 new_dentry
->d_name
.name
,
8336 new_dentry
->d_name
.len
,
8338 btrfs_ino(new_dir
), index
);
8342 * this is an ugly little race, but the rename is required
8343 * to make sure that if we crash, the inode is either at the
8344 * old name or the new one. pinning the log transaction lets
8345 * us make sure we don't allow a log commit to come in after
8346 * we unlink the name but before we add the new name back in.
8348 btrfs_pin_log_trans(root
);
8351 * make sure the inode gets flushed if it is replacing
8354 if (new_inode
&& new_inode
->i_size
&& S_ISREG(old_inode
->i_mode
))
8355 btrfs_add_ordered_operation(trans
, root
, old_inode
);
8357 inode_inc_iversion(old_dir
);
8358 inode_inc_iversion(new_dir
);
8359 inode_inc_iversion(old_inode
);
8360 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
8361 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
8362 old_inode
->i_ctime
= ctime
;
8364 if (old_dentry
->d_parent
!= new_dentry
->d_parent
)
8365 btrfs_record_unlink_dir(trans
, old_dir
, old_inode
, 1);
8367 if (unlikely(old_ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
8368 root_objectid
= BTRFS_I(old_inode
)->root
->root_key
.objectid
;
8369 ret
= btrfs_unlink_subvol(trans
, root
, old_dir
, root_objectid
,
8370 old_dentry
->d_name
.name
,
8371 old_dentry
->d_name
.len
);
8373 ret
= __btrfs_unlink_inode(trans
, root
, old_dir
,
8374 old_dentry
->d_inode
,
8375 old_dentry
->d_name
.name
,
8376 old_dentry
->d_name
.len
);
8378 ret
= btrfs_update_inode(trans
, root
, old_inode
);
8381 btrfs_abort_transaction(trans
, root
, ret
);
8386 inode_inc_iversion(new_inode
);
8387 new_inode
->i_ctime
= CURRENT_TIME
;
8388 if (unlikely(btrfs_ino(new_inode
) ==
8389 BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)) {
8390 root_objectid
= BTRFS_I(new_inode
)->location
.objectid
;
8391 ret
= btrfs_unlink_subvol(trans
, dest
, new_dir
,
8393 new_dentry
->d_name
.name
,
8394 new_dentry
->d_name
.len
);
8395 BUG_ON(new_inode
->i_nlink
== 0);
8397 ret
= btrfs_unlink_inode(trans
, dest
, new_dir
,
8398 new_dentry
->d_inode
,
8399 new_dentry
->d_name
.name
,
8400 new_dentry
->d_name
.len
);
8402 if (!ret
&& new_inode
->i_nlink
== 0)
8403 ret
= btrfs_orphan_add(trans
, new_dentry
->d_inode
);
8405 btrfs_abort_transaction(trans
, root
, ret
);
8410 ret
= btrfs_add_link(trans
, new_dir
, old_inode
,
8411 new_dentry
->d_name
.name
,
8412 new_dentry
->d_name
.len
, 0, index
);
8414 btrfs_abort_transaction(trans
, root
, ret
);
8418 if (old_inode
->i_nlink
== 1)
8419 BTRFS_I(old_inode
)->dir_index
= index
;
8421 if (old_ino
!= BTRFS_FIRST_FREE_OBJECTID
) {
8422 struct dentry
*parent
= new_dentry
->d_parent
;
8423 btrfs_log_new_name(trans
, old_inode
, old_dir
, parent
);
8424 btrfs_end_log_trans(root
);
8427 btrfs_end_transaction(trans
, root
);
8429 if (old_ino
== BTRFS_FIRST_FREE_OBJECTID
)
8430 up_read(&root
->fs_info
->subvol_sem
);
8435 static void btrfs_run_delalloc_work(struct btrfs_work
*work
)
8437 struct btrfs_delalloc_work
*delalloc_work
;
8438 struct inode
*inode
;
8440 delalloc_work
= container_of(work
, struct btrfs_delalloc_work
,
8442 inode
= delalloc_work
->inode
;
8443 if (delalloc_work
->wait
) {
8444 btrfs_wait_ordered_range(inode
, 0, (u64
)-1);
8446 filemap_flush(inode
->i_mapping
);
8447 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
8448 &BTRFS_I(inode
)->runtime_flags
))
8449 filemap_flush(inode
->i_mapping
);
8452 if (delalloc_work
->delay_iput
)
8453 btrfs_add_delayed_iput(inode
);
8456 complete(&delalloc_work
->completion
);
8459 struct btrfs_delalloc_work
*btrfs_alloc_delalloc_work(struct inode
*inode
,
8460 int wait
, int delay_iput
)
8462 struct btrfs_delalloc_work
*work
;
8464 work
= kmem_cache_zalloc(btrfs_delalloc_work_cachep
, GFP_NOFS
);
8468 init_completion(&work
->completion
);
8469 INIT_LIST_HEAD(&work
->list
);
8470 work
->inode
= inode
;
8472 work
->delay_iput
= delay_iput
;
8473 btrfs_init_work(&work
->work
, btrfs_run_delalloc_work
, NULL
, NULL
);
8478 void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work
*work
)
8480 wait_for_completion(&work
->completion
);
8481 kmem_cache_free(btrfs_delalloc_work_cachep
, work
);
8485 * some fairly slow code that needs optimization. This walks the list
8486 * of all the inodes with pending delalloc and forces them to disk.
8488 static int __start_delalloc_inodes(struct btrfs_root
*root
, int delay_iput
,
8491 struct btrfs_inode
*binode
;
8492 struct inode
*inode
;
8493 struct btrfs_delalloc_work
*work
, *next
;
8494 struct list_head works
;
8495 struct list_head splice
;
8498 INIT_LIST_HEAD(&works
);
8499 INIT_LIST_HEAD(&splice
);
8501 mutex_lock(&root
->delalloc_mutex
);
8502 spin_lock(&root
->delalloc_lock
);
8503 list_splice_init(&root
->delalloc_inodes
, &splice
);
8504 while (!list_empty(&splice
)) {
8505 binode
= list_entry(splice
.next
, struct btrfs_inode
,
8508 list_move_tail(&binode
->delalloc_inodes
,
8509 &root
->delalloc_inodes
);
8510 inode
= igrab(&binode
->vfs_inode
);
8512 cond_resched_lock(&root
->delalloc_lock
);
8515 spin_unlock(&root
->delalloc_lock
);
8517 work
= btrfs_alloc_delalloc_work(inode
, 0, delay_iput
);
8518 if (unlikely(!work
)) {
8520 btrfs_add_delayed_iput(inode
);
8526 list_add_tail(&work
->list
, &works
);
8527 btrfs_queue_work(root
->fs_info
->flush_workers
,
8530 if (nr
!= -1 && ret
>= nr
)
8533 spin_lock(&root
->delalloc_lock
);
8535 spin_unlock(&root
->delalloc_lock
);
8538 list_for_each_entry_safe(work
, next
, &works
, list
) {
8539 list_del_init(&work
->list
);
8540 btrfs_wait_and_free_delalloc_work(work
);
8543 if (!list_empty_careful(&splice
)) {
8544 spin_lock(&root
->delalloc_lock
);
8545 list_splice_tail(&splice
, &root
->delalloc_inodes
);
8546 spin_unlock(&root
->delalloc_lock
);
8548 mutex_unlock(&root
->delalloc_mutex
);
8552 int btrfs_start_delalloc_inodes(struct btrfs_root
*root
, int delay_iput
)
8556 if (test_bit(BTRFS_FS_STATE_ERROR
, &root
->fs_info
->fs_state
))
8559 ret
= __start_delalloc_inodes(root
, delay_iput
, -1);
8563 * the filemap_flush will queue IO into the worker threads, but
8564 * we have to make sure the IO is actually started and that
8565 * ordered extents get created before we return
8567 atomic_inc(&root
->fs_info
->async_submit_draining
);
8568 while (atomic_read(&root
->fs_info
->nr_async_submits
) ||
8569 atomic_read(&root
->fs_info
->async_delalloc_pages
)) {
8570 wait_event(root
->fs_info
->async_submit_wait
,
8571 (atomic_read(&root
->fs_info
->nr_async_submits
) == 0 &&
8572 atomic_read(&root
->fs_info
->async_delalloc_pages
) == 0));
8574 atomic_dec(&root
->fs_info
->async_submit_draining
);
8578 int btrfs_start_delalloc_roots(struct btrfs_fs_info
*fs_info
, int delay_iput
,
8581 struct btrfs_root
*root
;
8582 struct list_head splice
;
8585 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
))
8588 INIT_LIST_HEAD(&splice
);
8590 mutex_lock(&fs_info
->delalloc_root_mutex
);
8591 spin_lock(&fs_info
->delalloc_root_lock
);
8592 list_splice_init(&fs_info
->delalloc_roots
, &splice
);
8593 while (!list_empty(&splice
) && nr
) {
8594 root
= list_first_entry(&splice
, struct btrfs_root
,
8596 root
= btrfs_grab_fs_root(root
);
8598 list_move_tail(&root
->delalloc_root
,
8599 &fs_info
->delalloc_roots
);
8600 spin_unlock(&fs_info
->delalloc_root_lock
);
8602 ret
= __start_delalloc_inodes(root
, delay_iput
, nr
);
8603 btrfs_put_fs_root(root
);
8611 spin_lock(&fs_info
->delalloc_root_lock
);
8613 spin_unlock(&fs_info
->delalloc_root_lock
);
8616 atomic_inc(&fs_info
->async_submit_draining
);
8617 while (atomic_read(&fs_info
->nr_async_submits
) ||
8618 atomic_read(&fs_info
->async_delalloc_pages
)) {
8619 wait_event(fs_info
->async_submit_wait
,
8620 (atomic_read(&fs_info
->nr_async_submits
) == 0 &&
8621 atomic_read(&fs_info
->async_delalloc_pages
) == 0));
8623 atomic_dec(&fs_info
->async_submit_draining
);
8625 if (!list_empty_careful(&splice
)) {
8626 spin_lock(&fs_info
->delalloc_root_lock
);
8627 list_splice_tail(&splice
, &fs_info
->delalloc_roots
);
8628 spin_unlock(&fs_info
->delalloc_root_lock
);
8630 mutex_unlock(&fs_info
->delalloc_root_mutex
);
8634 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
8635 const char *symname
)
8637 struct btrfs_trans_handle
*trans
;
8638 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
8639 struct btrfs_path
*path
;
8640 struct btrfs_key key
;
8641 struct inode
*inode
= NULL
;
8649 struct btrfs_file_extent_item
*ei
;
8650 struct extent_buffer
*leaf
;
8652 name_len
= strlen(symname
);
8653 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
8654 return -ENAMETOOLONG
;
8657 * 2 items for inode item and ref
8658 * 2 items for dir items
8659 * 1 item for xattr if selinux is on
8661 trans
= btrfs_start_transaction(root
, 5);
8663 return PTR_ERR(trans
);
8665 err
= btrfs_find_free_ino(root
, &objectid
);
8669 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
8670 dentry
->d_name
.len
, btrfs_ino(dir
), objectid
,
8671 S_IFLNK
|S_IRWXUGO
, &index
);
8672 if (IS_ERR(inode
)) {
8673 err
= PTR_ERR(inode
);
8677 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
8684 * If the active LSM wants to access the inode during
8685 * d_instantiate it needs these. Smack checks to see
8686 * if the filesystem supports xattrs by looking at the
8689 inode
->i_fop
= &btrfs_file_operations
;
8690 inode
->i_op
= &btrfs_file_inode_operations
;
8692 err
= btrfs_add_nondir(trans
, dir
, dentry
, inode
, 0, index
);
8696 inode
->i_mapping
->a_ops
= &btrfs_aops
;
8697 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
8698 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
8703 path
= btrfs_alloc_path();
8709 key
.objectid
= btrfs_ino(inode
);
8711 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
8712 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
8713 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
8717 btrfs_free_path(path
);
8720 leaf
= path
->nodes
[0];
8721 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
8722 struct btrfs_file_extent_item
);
8723 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
8724 btrfs_set_file_extent_type(leaf
, ei
,
8725 BTRFS_FILE_EXTENT_INLINE
);
8726 btrfs_set_file_extent_encryption(leaf
, ei
, 0);
8727 btrfs_set_file_extent_compression(leaf
, ei
, 0);
8728 btrfs_set_file_extent_other_encoding(leaf
, ei
, 0);
8729 btrfs_set_file_extent_ram_bytes(leaf
, ei
, name_len
);
8731 ptr
= btrfs_file_extent_inline_start(ei
);
8732 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
8733 btrfs_mark_buffer_dirty(leaf
);
8734 btrfs_free_path(path
);
8736 inode
->i_op
= &btrfs_symlink_inode_operations
;
8737 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
8738 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
8739 inode_set_bytes(inode
, name_len
);
8740 btrfs_i_size_write(inode
, name_len
);
8741 err
= btrfs_update_inode(trans
, root
, inode
);
8747 d_instantiate(dentry
, inode
);
8748 btrfs_end_transaction(trans
, root
);
8750 inode_dec_link_count(inode
);
8753 btrfs_btree_balance_dirty(root
);
8757 static int __btrfs_prealloc_file_range(struct inode
*inode
, int mode
,
8758 u64 start
, u64 num_bytes
, u64 min_size
,
8759 loff_t actual_len
, u64
*alloc_hint
,
8760 struct btrfs_trans_handle
*trans
)
8762 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
8763 struct extent_map
*em
;
8764 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8765 struct btrfs_key ins
;
8766 u64 cur_offset
= start
;
8770 bool own_trans
= true;
8774 while (num_bytes
> 0) {
8776 trans
= btrfs_start_transaction(root
, 3);
8777 if (IS_ERR(trans
)) {
8778 ret
= PTR_ERR(trans
);
8783 cur_bytes
= min(num_bytes
, 256ULL * 1024 * 1024);
8784 cur_bytes
= max(cur_bytes
, min_size
);
8785 ret
= btrfs_reserve_extent(root
, cur_bytes
, min_size
, 0,
8786 *alloc_hint
, &ins
, 1);
8789 btrfs_end_transaction(trans
, root
);
8793 ret
= insert_reserved_file_extent(trans
, inode
,
8794 cur_offset
, ins
.objectid
,
8795 ins
.offset
, ins
.offset
,
8796 ins
.offset
, 0, 0, 0,
8797 BTRFS_FILE_EXTENT_PREALLOC
);
8799 btrfs_free_reserved_extent(root
, ins
.objectid
,
8801 btrfs_abort_transaction(trans
, root
, ret
);
8803 btrfs_end_transaction(trans
, root
);
8806 btrfs_drop_extent_cache(inode
, cur_offset
,
8807 cur_offset
+ ins
.offset
-1, 0);
8809 em
= alloc_extent_map();
8811 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
8812 &BTRFS_I(inode
)->runtime_flags
);
8816 em
->start
= cur_offset
;
8817 em
->orig_start
= cur_offset
;
8818 em
->len
= ins
.offset
;
8819 em
->block_start
= ins
.objectid
;
8820 em
->block_len
= ins
.offset
;
8821 em
->orig_block_len
= ins
.offset
;
8822 em
->ram_bytes
= ins
.offset
;
8823 em
->bdev
= root
->fs_info
->fs_devices
->latest_bdev
;
8824 set_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
);
8825 em
->generation
= trans
->transid
;
8828 write_lock(&em_tree
->lock
);
8829 ret
= add_extent_mapping(em_tree
, em
, 1);
8830 write_unlock(&em_tree
->lock
);
8833 btrfs_drop_extent_cache(inode
, cur_offset
,
8834 cur_offset
+ ins
.offset
- 1,
8837 free_extent_map(em
);
8839 num_bytes
-= ins
.offset
;
8840 cur_offset
+= ins
.offset
;
8841 *alloc_hint
= ins
.objectid
+ ins
.offset
;
8843 inode_inc_iversion(inode
);
8844 inode
->i_ctime
= CURRENT_TIME
;
8845 BTRFS_I(inode
)->flags
|= BTRFS_INODE_PREALLOC
;
8846 if (!(mode
& FALLOC_FL_KEEP_SIZE
) &&
8847 (actual_len
> inode
->i_size
) &&
8848 (cur_offset
> inode
->i_size
)) {
8849 if (cur_offset
> actual_len
)
8850 i_size
= actual_len
;
8852 i_size
= cur_offset
;
8853 i_size_write(inode
, i_size
);
8854 btrfs_ordered_update_i_size(inode
, i_size
, NULL
);
8857 ret
= btrfs_update_inode(trans
, root
, inode
);
8860 btrfs_abort_transaction(trans
, root
, ret
);
8862 btrfs_end_transaction(trans
, root
);
8867 btrfs_end_transaction(trans
, root
);
8872 int btrfs_prealloc_file_range(struct inode
*inode
, int mode
,
8873 u64 start
, u64 num_bytes
, u64 min_size
,
8874 loff_t actual_len
, u64
*alloc_hint
)
8876 return __btrfs_prealloc_file_range(inode
, mode
, start
, num_bytes
,
8877 min_size
, actual_len
, alloc_hint
,
8881 int btrfs_prealloc_file_range_trans(struct inode
*inode
,
8882 struct btrfs_trans_handle
*trans
, int mode
,
8883 u64 start
, u64 num_bytes
, u64 min_size
,
8884 loff_t actual_len
, u64
*alloc_hint
)
8886 return __btrfs_prealloc_file_range(inode
, mode
, start
, num_bytes
,
8887 min_size
, actual_len
, alloc_hint
, trans
);
8890 static int btrfs_set_page_dirty(struct page
*page
)
8892 return __set_page_dirty_nobuffers(page
);
8895 static int btrfs_permission(struct inode
*inode
, int mask
)
8897 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8898 umode_t mode
= inode
->i_mode
;
8900 if (mask
& MAY_WRITE
&&
8901 (S_ISREG(mode
) || S_ISDIR(mode
) || S_ISLNK(mode
))) {
8902 if (btrfs_root_readonly(root
))
8904 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_READONLY
)
8907 return generic_permission(inode
, mask
);
8910 static int btrfs_tmpfile(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
8912 struct btrfs_trans_handle
*trans
;
8913 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
8914 struct inode
*inode
= NULL
;
8920 * 5 units required for adding orphan entry
8922 trans
= btrfs_start_transaction(root
, 5);
8924 return PTR_ERR(trans
);
8926 ret
= btrfs_find_free_ino(root
, &objectid
);
8930 inode
= btrfs_new_inode(trans
, root
, dir
, NULL
, 0,
8931 btrfs_ino(dir
), objectid
, mode
, &index
);
8932 if (IS_ERR(inode
)) {
8933 ret
= PTR_ERR(inode
);
8938 ret
= btrfs_init_inode_security(trans
, inode
, dir
, NULL
);
8942 ret
= btrfs_update_inode(trans
, root
, inode
);
8946 inode
->i_fop
= &btrfs_file_operations
;
8947 inode
->i_op
= &btrfs_file_inode_operations
;
8949 inode
->i_mapping
->a_ops
= &btrfs_aops
;
8950 inode
->i_mapping
->backing_dev_info
= &root
->fs_info
->bdi
;
8951 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
8953 ret
= btrfs_orphan_add(trans
, inode
);
8957 d_tmpfile(dentry
, inode
);
8958 mark_inode_dirty(inode
);
8961 btrfs_end_transaction(trans
, root
);
8964 btrfs_balance_delayed_items(root
);
8965 btrfs_btree_balance_dirty(root
);
8970 static const struct inode_operations btrfs_dir_inode_operations
= {
8971 .getattr
= btrfs_getattr
,
8972 .lookup
= btrfs_lookup
,
8973 .create
= btrfs_create
,
8974 .unlink
= btrfs_unlink
,
8976 .mkdir
= btrfs_mkdir
,
8977 .rmdir
= btrfs_rmdir
,
8978 .rename
= btrfs_rename
,
8979 .symlink
= btrfs_symlink
,
8980 .setattr
= btrfs_setattr
,
8981 .mknod
= btrfs_mknod
,
8982 .setxattr
= btrfs_setxattr
,
8983 .getxattr
= btrfs_getxattr
,
8984 .listxattr
= btrfs_listxattr
,
8985 .removexattr
= btrfs_removexattr
,
8986 .permission
= btrfs_permission
,
8987 .get_acl
= btrfs_get_acl
,
8988 .set_acl
= btrfs_set_acl
,
8989 .update_time
= btrfs_update_time
,
8990 .tmpfile
= btrfs_tmpfile
,
8992 static const struct inode_operations btrfs_dir_ro_inode_operations
= {
8993 .lookup
= btrfs_lookup
,
8994 .permission
= btrfs_permission
,
8995 .get_acl
= btrfs_get_acl
,
8996 .set_acl
= btrfs_set_acl
,
8997 .update_time
= btrfs_update_time
,
9000 static const struct file_operations btrfs_dir_file_operations
= {
9001 .llseek
= generic_file_llseek
,
9002 .read
= generic_read_dir
,
9003 .iterate
= btrfs_real_readdir
,
9004 .unlocked_ioctl
= btrfs_ioctl
,
9005 #ifdef CONFIG_COMPAT
9006 .compat_ioctl
= btrfs_ioctl
,
9008 .release
= btrfs_release_file
,
9009 .fsync
= btrfs_sync_file
,
9012 static struct extent_io_ops btrfs_extent_io_ops
= {
9013 .fill_delalloc
= run_delalloc_range
,
9014 .submit_bio_hook
= btrfs_submit_bio_hook
,
9015 .merge_bio_hook
= btrfs_merge_bio_hook
,
9016 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
9017 .writepage_end_io_hook
= btrfs_writepage_end_io_hook
,
9018 .writepage_start_hook
= btrfs_writepage_start_hook
,
9019 .set_bit_hook
= btrfs_set_bit_hook
,
9020 .clear_bit_hook
= btrfs_clear_bit_hook
,
9021 .merge_extent_hook
= btrfs_merge_extent_hook
,
9022 .split_extent_hook
= btrfs_split_extent_hook
,
9026 * btrfs doesn't support the bmap operation because swapfiles
9027 * use bmap to make a mapping of extents in the file. They assume
9028 * these extents won't change over the life of the file and they
9029 * use the bmap result to do IO directly to the drive.
9031 * the btrfs bmap call would return logical addresses that aren't
9032 * suitable for IO and they also will change frequently as COW
9033 * operations happen. So, swapfile + btrfs == corruption.
9035 * For now we're avoiding this by dropping bmap.
9037 static const struct address_space_operations btrfs_aops
= {
9038 .readpage
= btrfs_readpage
,
9039 .writepage
= btrfs_writepage
,
9040 .writepages
= btrfs_writepages
,
9041 .readpages
= btrfs_readpages
,
9042 .direct_IO
= btrfs_direct_IO
,
9043 .invalidatepage
= btrfs_invalidatepage
,
9044 .releasepage
= btrfs_releasepage
,
9045 .set_page_dirty
= btrfs_set_page_dirty
,
9046 .error_remove_page
= generic_error_remove_page
,
9049 static const struct address_space_operations btrfs_symlink_aops
= {
9050 .readpage
= btrfs_readpage
,
9051 .writepage
= btrfs_writepage
,
9052 .invalidatepage
= btrfs_invalidatepage
,
9053 .releasepage
= btrfs_releasepage
,
9056 static const struct inode_operations btrfs_file_inode_operations
= {
9057 .getattr
= btrfs_getattr
,
9058 .setattr
= btrfs_setattr
,
9059 .setxattr
= btrfs_setxattr
,
9060 .getxattr
= btrfs_getxattr
,
9061 .listxattr
= btrfs_listxattr
,
9062 .removexattr
= btrfs_removexattr
,
9063 .permission
= btrfs_permission
,
9064 .fiemap
= btrfs_fiemap
,
9065 .get_acl
= btrfs_get_acl
,
9066 .set_acl
= btrfs_set_acl
,
9067 .update_time
= btrfs_update_time
,
9069 static const struct inode_operations btrfs_special_inode_operations
= {
9070 .getattr
= btrfs_getattr
,
9071 .setattr
= btrfs_setattr
,
9072 .permission
= btrfs_permission
,
9073 .setxattr
= btrfs_setxattr
,
9074 .getxattr
= btrfs_getxattr
,
9075 .listxattr
= btrfs_listxattr
,
9076 .removexattr
= btrfs_removexattr
,
9077 .get_acl
= btrfs_get_acl
,
9078 .set_acl
= btrfs_set_acl
,
9079 .update_time
= btrfs_update_time
,
9081 static const struct inode_operations btrfs_symlink_inode_operations
= {
9082 .readlink
= generic_readlink
,
9083 .follow_link
= page_follow_link_light
,
9084 .put_link
= page_put_link
,
9085 .getattr
= btrfs_getattr
,
9086 .setattr
= btrfs_setattr
,
9087 .permission
= btrfs_permission
,
9088 .setxattr
= btrfs_setxattr
,
9089 .getxattr
= btrfs_getxattr
,
9090 .listxattr
= btrfs_listxattr
,
9091 .removexattr
= btrfs_removexattr
,
9092 .update_time
= btrfs_update_time
,
9095 const struct dentry_operations btrfs_dentry_operations
= {
9096 .d_delete
= btrfs_dentry_delete
,
9097 .d_release
= btrfs_dentry_release
,