1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2007 Oracle. All rights reserved.
6 #include <crypto/hash.h>
7 #include <linux/kernel.h>
9 #include <linux/buffer_head.h>
10 #include <linux/file.h>
12 #include <linux/pagemap.h>
13 #include <linux/highmem.h>
14 #include <linux/time.h>
15 #include <linux/init.h>
16 #include <linux/string.h>
17 #include <linux/backing-dev.h>
18 #include <linux/writeback.h>
19 #include <linux/compat.h>
20 #include <linux/xattr.h>
21 #include <linux/posix_acl.h>
22 #include <linux/falloc.h>
23 #include <linux/slab.h>
24 #include <linux/ratelimit.h>
25 #include <linux/btrfs.h>
26 #include <linux/blkdev.h>
27 #include <linux/posix_acl_xattr.h>
28 #include <linux/uio.h>
29 #include <linux/magic.h>
30 #include <linux/iversion.h>
31 #include <linux/swap.h>
32 #include <linux/migrate.h>
33 #include <linux/sched/mm.h>
34 #include <asm/unaligned.h>
38 #include "transaction.h"
39 #include "btrfs_inode.h"
40 #include "print-tree.h"
41 #include "ordered-data.h"
45 #include "compression.h"
47 #include "free-space-cache.h"
48 #include "inode-map.h"
51 #include "delalloc-space.h"
52 #include "block-group.h"
53 #include "space-info.h"
55 struct btrfs_iget_args
{
57 struct btrfs_root
*root
;
60 struct btrfs_dio_data
{
62 u64 unsubmitted_oe_range_start
;
63 u64 unsubmitted_oe_range_end
;
67 static const struct inode_operations btrfs_dir_inode_operations
;
68 static const struct inode_operations btrfs_symlink_inode_operations
;
69 static const struct inode_operations btrfs_special_inode_operations
;
70 static const struct inode_operations btrfs_file_inode_operations
;
71 static const struct address_space_operations btrfs_aops
;
72 static const struct file_operations btrfs_dir_file_operations
;
73 static const struct extent_io_ops btrfs_extent_io_ops
;
75 static struct kmem_cache
*btrfs_inode_cachep
;
76 struct kmem_cache
*btrfs_trans_handle_cachep
;
77 struct kmem_cache
*btrfs_path_cachep
;
78 struct kmem_cache
*btrfs_free_space_cachep
;
79 struct kmem_cache
*btrfs_free_space_bitmap_cachep
;
81 static int btrfs_setsize(struct inode
*inode
, struct iattr
*attr
);
82 static int btrfs_truncate(struct inode
*inode
, bool skip_writeback
);
83 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent
*ordered_extent
);
84 static noinline
int cow_file_range(struct btrfs_inode
*inode
,
85 struct page
*locked_page
,
86 u64 start
, u64 end
, int *page_started
,
87 unsigned long *nr_written
, int unlock
);
88 static struct extent_map
*create_io_em(struct btrfs_inode
*inode
, u64 start
,
89 u64 len
, u64 orig_start
, u64 block_start
,
90 u64 block_len
, u64 orig_block_len
,
91 u64 ram_bytes
, int compress_type
,
94 static void __endio_write_update_ordered(struct btrfs_inode
*inode
,
95 const u64 offset
, const u64 bytes
,
99 * Cleanup all submitted ordered extents in specified range to handle errors
100 * from the btrfs_run_delalloc_range() callback.
102 * NOTE: caller must ensure that when an error happens, it can not call
103 * extent_clear_unlock_delalloc() to clear both the bits EXTENT_DO_ACCOUNTING
104 * and EXTENT_DELALLOC simultaneously, because that causes the reserved metadata
105 * to be released, which we want to happen only when finishing the ordered
106 * extent (btrfs_finish_ordered_io()).
108 static inline void btrfs_cleanup_ordered_extents(struct btrfs_inode
*inode
,
109 struct page
*locked_page
,
110 u64 offset
, u64 bytes
)
112 unsigned long index
= offset
>> PAGE_SHIFT
;
113 unsigned long end_index
= (offset
+ bytes
- 1) >> PAGE_SHIFT
;
114 u64 page_start
= page_offset(locked_page
);
115 u64 page_end
= page_start
+ PAGE_SIZE
- 1;
119 while (index
<= end_index
) {
120 page
= find_get_page(inode
->vfs_inode
.i_mapping
, index
);
124 ClearPagePrivate2(page
);
129 * In case this page belongs to the delalloc range being instantiated
130 * then skip it, since the first page of a range is going to be
131 * properly cleaned up by the caller of run_delalloc_range
133 if (page_start
>= offset
&& page_end
<= (offset
+ bytes
- 1)) {
138 return __endio_write_update_ordered(inode
, offset
, bytes
, false);
141 static int btrfs_dirty_inode(struct inode
*inode
);
143 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
144 void btrfs_test_inode_set_ops(struct inode
*inode
)
146 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
150 static int btrfs_init_inode_security(struct btrfs_trans_handle
*trans
,
151 struct inode
*inode
, struct inode
*dir
,
152 const struct qstr
*qstr
)
156 err
= btrfs_init_acl(trans
, inode
, dir
);
158 err
= btrfs_xattr_security_init(trans
, inode
, dir
, qstr
);
163 * this does all the hard work for inserting an inline extent into
164 * the btree. The caller should have done a btrfs_drop_extents so that
165 * no overlapping inline items exist in the btree
167 static int insert_inline_extent(struct btrfs_trans_handle
*trans
,
168 struct btrfs_path
*path
, int extent_inserted
,
169 struct btrfs_root
*root
, struct inode
*inode
,
170 u64 start
, size_t size
, size_t compressed_size
,
172 struct page
**compressed_pages
)
174 struct extent_buffer
*leaf
;
175 struct page
*page
= NULL
;
178 struct btrfs_file_extent_item
*ei
;
180 size_t cur_size
= size
;
181 unsigned long offset
;
183 ASSERT((compressed_size
> 0 && compressed_pages
) ||
184 (compressed_size
== 0 && !compressed_pages
));
186 if (compressed_size
&& compressed_pages
)
187 cur_size
= compressed_size
;
189 inode_add_bytes(inode
, size
);
191 if (!extent_inserted
) {
192 struct btrfs_key key
;
195 key
.objectid
= btrfs_ino(BTRFS_I(inode
));
197 key
.type
= BTRFS_EXTENT_DATA_KEY
;
199 datasize
= btrfs_file_extent_calc_inline_size(cur_size
);
200 path
->leave_spinning
= 1;
201 ret
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
206 leaf
= path
->nodes
[0];
207 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
208 struct btrfs_file_extent_item
);
209 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
210 btrfs_set_file_extent_type(leaf
, ei
, BTRFS_FILE_EXTENT_INLINE
);
211 btrfs_set_file_extent_encryption(leaf
, ei
, 0);
212 btrfs_set_file_extent_other_encoding(leaf
, ei
, 0);
213 btrfs_set_file_extent_ram_bytes(leaf
, ei
, size
);
214 ptr
= btrfs_file_extent_inline_start(ei
);
216 if (compress_type
!= BTRFS_COMPRESS_NONE
) {
219 while (compressed_size
> 0) {
220 cpage
= compressed_pages
[i
];
221 cur_size
= min_t(unsigned long, compressed_size
,
224 kaddr
= kmap_atomic(cpage
);
225 write_extent_buffer(leaf
, kaddr
, ptr
, cur_size
);
226 kunmap_atomic(kaddr
);
230 compressed_size
-= cur_size
;
232 btrfs_set_file_extent_compression(leaf
, ei
,
235 page
= find_get_page(inode
->i_mapping
,
236 start
>> PAGE_SHIFT
);
237 btrfs_set_file_extent_compression(leaf
, ei
, 0);
238 kaddr
= kmap_atomic(page
);
239 offset
= offset_in_page(start
);
240 write_extent_buffer(leaf
, kaddr
+ offset
, ptr
, size
);
241 kunmap_atomic(kaddr
);
244 btrfs_mark_buffer_dirty(leaf
);
245 btrfs_release_path(path
);
248 * We align size to sectorsize for inline extents just for simplicity
251 size
= ALIGN(size
, root
->fs_info
->sectorsize
);
252 ret
= btrfs_inode_set_file_extent_range(BTRFS_I(inode
), start
, size
);
257 * we're an inline extent, so nobody can
258 * extend the file past i_size without locking
259 * a page we already have locked.
261 * We must do any isize and inode updates
262 * before we unlock the pages. Otherwise we
263 * could end up racing with unlink.
265 BTRFS_I(inode
)->disk_i_size
= inode
->i_size
;
266 ret
= btrfs_update_inode(trans
, root
, inode
);
274 * conditionally insert an inline extent into the file. This
275 * does the checks required to make sure the data is small enough
276 * to fit as an inline extent.
278 static noinline
int cow_file_range_inline(struct btrfs_inode
*inode
, u64 start
,
279 u64 end
, size_t compressed_size
,
281 struct page
**compressed_pages
)
283 struct btrfs_root
*root
= inode
->root
;
284 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
285 struct btrfs_trans_handle
*trans
;
286 u64 isize
= i_size_read(&inode
->vfs_inode
);
287 u64 actual_end
= min(end
+ 1, isize
);
288 u64 inline_len
= actual_end
- start
;
289 u64 aligned_end
= ALIGN(end
, fs_info
->sectorsize
);
290 u64 data_len
= inline_len
;
292 struct btrfs_path
*path
;
293 int extent_inserted
= 0;
294 u32 extent_item_size
;
297 data_len
= compressed_size
;
300 actual_end
> fs_info
->sectorsize
||
301 data_len
> BTRFS_MAX_INLINE_DATA_SIZE(fs_info
) ||
303 (actual_end
& (fs_info
->sectorsize
- 1)) == 0) ||
305 data_len
> fs_info
->max_inline
) {
309 path
= btrfs_alloc_path();
313 trans
= btrfs_join_transaction(root
);
315 btrfs_free_path(path
);
316 return PTR_ERR(trans
);
318 trans
->block_rsv
= &inode
->block_rsv
;
320 if (compressed_size
&& compressed_pages
)
321 extent_item_size
= btrfs_file_extent_calc_inline_size(
324 extent_item_size
= btrfs_file_extent_calc_inline_size(
327 ret
= __btrfs_drop_extents(trans
, root
, inode
, path
, start
, aligned_end
,
328 NULL
, 1, 1, extent_item_size
,
331 btrfs_abort_transaction(trans
, ret
);
335 if (isize
> actual_end
)
336 inline_len
= min_t(u64
, isize
, actual_end
);
337 ret
= insert_inline_extent(trans
, path
, extent_inserted
,
338 root
, &inode
->vfs_inode
, start
,
339 inline_len
, compressed_size
,
340 compress_type
, compressed_pages
);
341 if (ret
&& ret
!= -ENOSPC
) {
342 btrfs_abort_transaction(trans
, ret
);
344 } else if (ret
== -ENOSPC
) {
349 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &inode
->runtime_flags
);
350 btrfs_drop_extent_cache(inode
, start
, aligned_end
- 1, 0);
353 * Don't forget to free the reserved space, as for inlined extent
354 * it won't count as data extent, free them directly here.
355 * And at reserve time, it's always aligned to page size, so
356 * just free one page here.
358 btrfs_qgroup_free_data(inode
, NULL
, 0, PAGE_SIZE
);
359 btrfs_free_path(path
);
360 btrfs_end_transaction(trans
);
364 struct async_extent
{
369 unsigned long nr_pages
;
371 struct list_head list
;
376 struct page
*locked_page
;
379 unsigned int write_flags
;
380 struct list_head extents
;
381 struct cgroup_subsys_state
*blkcg_css
;
382 struct btrfs_work work
;
387 /* Number of chunks in flight; must be first in the structure */
389 struct async_chunk chunks
[];
392 static noinline
int add_async_extent(struct async_chunk
*cow
,
393 u64 start
, u64 ram_size
,
396 unsigned long nr_pages
,
399 struct async_extent
*async_extent
;
401 async_extent
= kmalloc(sizeof(*async_extent
), GFP_NOFS
);
402 BUG_ON(!async_extent
); /* -ENOMEM */
403 async_extent
->start
= start
;
404 async_extent
->ram_size
= ram_size
;
405 async_extent
->compressed_size
= compressed_size
;
406 async_extent
->pages
= pages
;
407 async_extent
->nr_pages
= nr_pages
;
408 async_extent
->compress_type
= compress_type
;
409 list_add_tail(&async_extent
->list
, &cow
->extents
);
414 * Check if the inode has flags compatible with compression
416 static inline bool inode_can_compress(struct btrfs_inode
*inode
)
418 if (inode
->flags
& BTRFS_INODE_NODATACOW
||
419 inode
->flags
& BTRFS_INODE_NODATASUM
)
425 * Check if the inode needs to be submitted to compression, based on mount
426 * options, defragmentation, properties or heuristics.
428 static inline int inode_need_compress(struct btrfs_inode
*inode
, u64 start
,
431 struct btrfs_fs_info
*fs_info
= inode
->root
->fs_info
;
433 if (!inode_can_compress(inode
)) {
434 WARN(IS_ENABLED(CONFIG_BTRFS_DEBUG
),
435 KERN_ERR
"BTRFS: unexpected compression for ino %llu\n",
440 if (btrfs_test_opt(fs_info
, FORCE_COMPRESS
))
443 if (inode
->defrag_compress
)
445 /* bad compression ratios */
446 if (inode
->flags
& BTRFS_INODE_NOCOMPRESS
)
448 if (btrfs_test_opt(fs_info
, COMPRESS
) ||
449 inode
->flags
& BTRFS_INODE_COMPRESS
||
450 inode
->prop_compress
)
451 return btrfs_compress_heuristic(&inode
->vfs_inode
, start
, end
);
455 static inline void inode_should_defrag(struct btrfs_inode
*inode
,
456 u64 start
, u64 end
, u64 num_bytes
, u64 small_write
)
458 /* If this is a small write inside eof, kick off a defrag */
459 if (num_bytes
< small_write
&&
460 (start
> 0 || end
+ 1 < inode
->disk_i_size
))
461 btrfs_add_inode_defrag(NULL
, inode
);
465 * we create compressed extents in two phases. The first
466 * phase compresses a range of pages that have already been
467 * locked (both pages and state bits are locked).
469 * This is done inside an ordered work queue, and the compression
470 * is spread across many cpus. The actual IO submission is step
471 * two, and the ordered work queue takes care of making sure that
472 * happens in the same order things were put onto the queue by
473 * writepages and friends.
475 * If this code finds it can't get good compression, it puts an
476 * entry onto the work queue to write the uncompressed bytes. This
477 * makes sure that both compressed inodes and uncompressed inodes
478 * are written in the same order that the flusher thread sent them
481 static noinline
int compress_file_range(struct async_chunk
*async_chunk
)
483 struct inode
*inode
= async_chunk
->inode
;
484 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
485 u64 blocksize
= fs_info
->sectorsize
;
486 u64 start
= async_chunk
->start
;
487 u64 end
= async_chunk
->end
;
491 struct page
**pages
= NULL
;
492 unsigned long nr_pages
;
493 unsigned long total_compressed
= 0;
494 unsigned long total_in
= 0;
497 int compress_type
= fs_info
->compress_type
;
498 int compressed_extents
= 0;
501 inode_should_defrag(BTRFS_I(inode
), start
, end
, end
- start
+ 1,
505 * We need to save i_size before now because it could change in between
506 * us evaluating the size and assigning it. This is because we lock and
507 * unlock the page in truncate and fallocate, and then modify the i_size
510 * The barriers are to emulate READ_ONCE, remove that once i_size_read
514 i_size
= i_size_read(inode
);
516 actual_end
= min_t(u64
, i_size
, end
+ 1);
519 nr_pages
= (end
>> PAGE_SHIFT
) - (start
>> PAGE_SHIFT
) + 1;
520 BUILD_BUG_ON((BTRFS_MAX_COMPRESSED
% PAGE_SIZE
) != 0);
521 nr_pages
= min_t(unsigned long, nr_pages
,
522 BTRFS_MAX_COMPRESSED
/ PAGE_SIZE
);
525 * we don't want to send crud past the end of i_size through
526 * compression, that's just a waste of CPU time. So, if the
527 * end of the file is before the start of our current
528 * requested range of bytes, we bail out to the uncompressed
529 * cleanup code that can deal with all of this.
531 * It isn't really the fastest way to fix things, but this is a
532 * very uncommon corner.
534 if (actual_end
<= start
)
535 goto cleanup_and_bail_uncompressed
;
537 total_compressed
= actual_end
- start
;
540 * skip compression for a small file range(<=blocksize) that
541 * isn't an inline extent, since it doesn't save disk space at all.
543 if (total_compressed
<= blocksize
&&
544 (start
> 0 || end
+ 1 < BTRFS_I(inode
)->disk_i_size
))
545 goto cleanup_and_bail_uncompressed
;
547 total_compressed
= min_t(unsigned long, total_compressed
,
548 BTRFS_MAX_UNCOMPRESSED
);
553 * we do compression for mount -o compress and when the
554 * inode has not been flagged as nocompress. This flag can
555 * change at any time if we discover bad compression ratios.
557 if (inode_need_compress(BTRFS_I(inode
), start
, end
)) {
559 pages
= kcalloc(nr_pages
, sizeof(struct page
*), GFP_NOFS
);
561 /* just bail out to the uncompressed code */
566 if (BTRFS_I(inode
)->defrag_compress
)
567 compress_type
= BTRFS_I(inode
)->defrag_compress
;
568 else if (BTRFS_I(inode
)->prop_compress
)
569 compress_type
= BTRFS_I(inode
)->prop_compress
;
572 * we need to call clear_page_dirty_for_io on each
573 * page in the range. Otherwise applications with the file
574 * mmap'd can wander in and change the page contents while
575 * we are compressing them.
577 * If the compression fails for any reason, we set the pages
578 * dirty again later on.
580 * Note that the remaining part is redirtied, the start pointer
581 * has moved, the end is the original one.
584 extent_range_clear_dirty_for_io(inode
, start
, end
);
588 /* Compression level is applied here and only here */
589 ret
= btrfs_compress_pages(
590 compress_type
| (fs_info
->compress_level
<< 4),
591 inode
->i_mapping
, start
,
598 unsigned long offset
= offset_in_page(total_compressed
);
599 struct page
*page
= pages
[nr_pages
- 1];
602 /* zero the tail end of the last page, we might be
603 * sending it down to disk
606 kaddr
= kmap_atomic(page
);
607 memset(kaddr
+ offset
, 0,
609 kunmap_atomic(kaddr
);
616 /* lets try to make an inline extent */
617 if (ret
|| total_in
< actual_end
) {
618 /* we didn't compress the entire range, try
619 * to make an uncompressed inline extent.
621 ret
= cow_file_range_inline(BTRFS_I(inode
), start
, end
,
622 0, BTRFS_COMPRESS_NONE
,
625 /* try making a compressed inline extent */
626 ret
= cow_file_range_inline(BTRFS_I(inode
), start
, end
,
628 compress_type
, pages
);
631 unsigned long clear_flags
= EXTENT_DELALLOC
|
632 EXTENT_DELALLOC_NEW
| EXTENT_DEFRAG
|
633 EXTENT_DO_ACCOUNTING
;
634 unsigned long page_error_op
;
636 page_error_op
= ret
< 0 ? PAGE_SET_ERROR
: 0;
639 * inline extent creation worked or returned error,
640 * we don't need to create any more async work items.
641 * Unlock and free up our temp pages.
643 * We use DO_ACCOUNTING here because we need the
644 * delalloc_release_metadata to be done _after_ we drop
645 * our outstanding extent for clearing delalloc for this
648 extent_clear_unlock_delalloc(BTRFS_I(inode
), start
, end
,
658 * Ensure we only free the compressed pages if we have
659 * them allocated, as we can still reach here with
660 * inode_need_compress() == false.
663 for (i
= 0; i
< nr_pages
; i
++) {
664 WARN_ON(pages
[i
]->mapping
);
675 * we aren't doing an inline extent round the compressed size
676 * up to a block size boundary so the allocator does sane
679 total_compressed
= ALIGN(total_compressed
, blocksize
);
682 * one last check to make sure the compression is really a
683 * win, compare the page count read with the blocks on disk,
684 * compression must free at least one sector size
686 total_in
= ALIGN(total_in
, PAGE_SIZE
);
687 if (total_compressed
+ blocksize
<= total_in
) {
688 compressed_extents
++;
691 * The async work queues will take care of doing actual
692 * allocation on disk for these compressed pages, and
693 * will submit them to the elevator.
695 add_async_extent(async_chunk
, start
, total_in
,
696 total_compressed
, pages
, nr_pages
,
699 if (start
+ total_in
< end
) {
705 return compressed_extents
;
710 * the compression code ran but failed to make things smaller,
711 * free any pages it allocated and our page pointer array
713 for (i
= 0; i
< nr_pages
; i
++) {
714 WARN_ON(pages
[i
]->mapping
);
719 total_compressed
= 0;
722 /* flag the file so we don't compress in the future */
723 if (!btrfs_test_opt(fs_info
, FORCE_COMPRESS
) &&
724 !(BTRFS_I(inode
)->prop_compress
)) {
725 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NOCOMPRESS
;
728 cleanup_and_bail_uncompressed
:
730 * No compression, but we still need to write the pages in the file
731 * we've been given so far. redirty the locked page if it corresponds
732 * to our extent and set things up for the async work queue to run
733 * cow_file_range to do the normal delalloc dance.
735 if (async_chunk
->locked_page
&&
736 (page_offset(async_chunk
->locked_page
) >= start
&&
737 page_offset(async_chunk
->locked_page
)) <= end
) {
738 __set_page_dirty_nobuffers(async_chunk
->locked_page
);
739 /* unlocked later on in the async handlers */
743 extent_range_redirty_for_io(inode
, start
, end
);
744 add_async_extent(async_chunk
, start
, end
- start
+ 1, 0, NULL
, 0,
745 BTRFS_COMPRESS_NONE
);
746 compressed_extents
++;
748 return compressed_extents
;
751 static void free_async_extent_pages(struct async_extent
*async_extent
)
755 if (!async_extent
->pages
)
758 for (i
= 0; i
< async_extent
->nr_pages
; i
++) {
759 WARN_ON(async_extent
->pages
[i
]->mapping
);
760 put_page(async_extent
->pages
[i
]);
762 kfree(async_extent
->pages
);
763 async_extent
->nr_pages
= 0;
764 async_extent
->pages
= NULL
;
768 * phase two of compressed writeback. This is the ordered portion
769 * of the code, which only gets called in the order the work was
770 * queued. We walk all the async extents created by compress_file_range
771 * and send them down to the disk.
773 static noinline
void submit_compressed_extents(struct async_chunk
*async_chunk
)
775 struct btrfs_inode
*inode
= BTRFS_I(async_chunk
->inode
);
776 struct btrfs_fs_info
*fs_info
= inode
->root
->fs_info
;
777 struct async_extent
*async_extent
;
779 struct btrfs_key ins
;
780 struct extent_map
*em
;
781 struct btrfs_root
*root
= inode
->root
;
782 struct extent_io_tree
*io_tree
= &inode
->io_tree
;
786 while (!list_empty(&async_chunk
->extents
)) {
787 async_extent
= list_entry(async_chunk
->extents
.next
,
788 struct async_extent
, list
);
789 list_del(&async_extent
->list
);
792 lock_extent(io_tree
, async_extent
->start
,
793 async_extent
->start
+ async_extent
->ram_size
- 1);
794 /* did the compression code fall back to uncompressed IO? */
795 if (!async_extent
->pages
) {
796 int page_started
= 0;
797 unsigned long nr_written
= 0;
799 /* allocate blocks */
800 ret
= cow_file_range(inode
, async_chunk
->locked_page
,
802 async_extent
->start
+
803 async_extent
->ram_size
- 1,
804 &page_started
, &nr_written
, 0);
809 * if page_started, cow_file_range inserted an
810 * inline extent and took care of all the unlocking
811 * and IO for us. Otherwise, we need to submit
812 * all those pages down to the drive.
814 if (!page_started
&& !ret
)
815 extent_write_locked_range(&inode
->vfs_inode
,
817 async_extent
->start
+
818 async_extent
->ram_size
- 1,
820 else if (ret
&& async_chunk
->locked_page
)
821 unlock_page(async_chunk
->locked_page
);
827 ret
= btrfs_reserve_extent(root
, async_extent
->ram_size
,
828 async_extent
->compressed_size
,
829 async_extent
->compressed_size
,
830 0, alloc_hint
, &ins
, 1, 1);
832 free_async_extent_pages(async_extent
);
834 if (ret
== -ENOSPC
) {
835 unlock_extent(io_tree
, async_extent
->start
,
836 async_extent
->start
+
837 async_extent
->ram_size
- 1);
840 * we need to redirty the pages if we decide to
841 * fallback to uncompressed IO, otherwise we
842 * will not submit these pages down to lower
845 extent_range_redirty_for_io(&inode
->vfs_inode
,
847 async_extent
->start
+
848 async_extent
->ram_size
- 1);
855 * here we're doing allocation and writeback of the
858 em
= create_io_em(inode
, async_extent
->start
,
859 async_extent
->ram_size
, /* len */
860 async_extent
->start
, /* orig_start */
861 ins
.objectid
, /* block_start */
862 ins
.offset
, /* block_len */
863 ins
.offset
, /* orig_block_len */
864 async_extent
->ram_size
, /* ram_bytes */
865 async_extent
->compress_type
,
866 BTRFS_ORDERED_COMPRESSED
);
868 /* ret value is not necessary due to void function */
869 goto out_free_reserve
;
872 ret
= btrfs_add_ordered_extent_compress(inode
,
875 async_extent
->ram_size
,
877 BTRFS_ORDERED_COMPRESSED
,
878 async_extent
->compress_type
);
880 btrfs_drop_extent_cache(inode
, async_extent
->start
,
881 async_extent
->start
+
882 async_extent
->ram_size
- 1, 0);
883 goto out_free_reserve
;
885 btrfs_dec_block_group_reservations(fs_info
, ins
.objectid
);
888 * clear dirty, set writeback and unlock the pages.
890 extent_clear_unlock_delalloc(inode
, async_extent
->start
,
891 async_extent
->start
+
892 async_extent
->ram_size
- 1,
893 NULL
, EXTENT_LOCKED
| EXTENT_DELALLOC
,
894 PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
|
896 if (btrfs_submit_compressed_write(inode
, async_extent
->start
,
897 async_extent
->ram_size
,
899 ins
.offset
, async_extent
->pages
,
900 async_extent
->nr_pages
,
901 async_chunk
->write_flags
,
902 async_chunk
->blkcg_css
)) {
903 struct page
*p
= async_extent
->pages
[0];
904 const u64 start
= async_extent
->start
;
905 const u64 end
= start
+ async_extent
->ram_size
- 1;
907 p
->mapping
= inode
->vfs_inode
.i_mapping
;
908 btrfs_writepage_endio_finish_ordered(p
, start
, end
, 0);
911 extent_clear_unlock_delalloc(inode
, start
, end
, NULL
, 0,
914 free_async_extent_pages(async_extent
);
916 alloc_hint
= ins
.objectid
+ ins
.offset
;
922 btrfs_dec_block_group_reservations(fs_info
, ins
.objectid
);
923 btrfs_free_reserved_extent(fs_info
, ins
.objectid
, ins
.offset
, 1);
925 extent_clear_unlock_delalloc(inode
, async_extent
->start
,
926 async_extent
->start
+
927 async_extent
->ram_size
- 1,
928 NULL
, EXTENT_LOCKED
| EXTENT_DELALLOC
|
929 EXTENT_DELALLOC_NEW
|
930 EXTENT_DEFRAG
| EXTENT_DO_ACCOUNTING
,
931 PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
|
932 PAGE_SET_WRITEBACK
| PAGE_END_WRITEBACK
|
934 free_async_extent_pages(async_extent
);
939 static u64
get_extent_allocation_hint(struct btrfs_inode
*inode
, u64 start
,
942 struct extent_map_tree
*em_tree
= &inode
->extent_tree
;
943 struct extent_map
*em
;
946 read_lock(&em_tree
->lock
);
947 em
= search_extent_mapping(em_tree
, start
, num_bytes
);
950 * if block start isn't an actual block number then find the
951 * first block in this inode and use that as a hint. If that
952 * block is also bogus then just don't worry about it.
954 if (em
->block_start
>= EXTENT_MAP_LAST_BYTE
) {
956 em
= search_extent_mapping(em_tree
, 0, 0);
957 if (em
&& em
->block_start
< EXTENT_MAP_LAST_BYTE
)
958 alloc_hint
= em
->block_start
;
962 alloc_hint
= em
->block_start
;
966 read_unlock(&em_tree
->lock
);
972 * when extent_io.c finds a delayed allocation range in the file,
973 * the call backs end up in this code. The basic idea is to
974 * allocate extents on disk for the range, and create ordered data structs
975 * in ram to track those extents.
977 * locked_page is the page that writepage had locked already. We use
978 * it to make sure we don't do extra locks or unlocks.
980 * *page_started is set to one if we unlock locked_page and do everything
981 * required to start IO on it. It may be clean and already done with
984 static noinline
int cow_file_range(struct btrfs_inode
*inode
,
985 struct page
*locked_page
,
986 u64 start
, u64 end
, int *page_started
,
987 unsigned long *nr_written
, int unlock
)
989 struct btrfs_root
*root
= inode
->root
;
990 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
993 unsigned long ram_size
;
994 u64 cur_alloc_size
= 0;
996 u64 blocksize
= fs_info
->sectorsize
;
997 struct btrfs_key ins
;
998 struct extent_map
*em
;
1000 unsigned long page_ops
;
1001 bool extent_reserved
= false;
1004 if (btrfs_is_free_space_inode(inode
)) {
1010 num_bytes
= ALIGN(end
- start
+ 1, blocksize
);
1011 num_bytes
= max(blocksize
, num_bytes
);
1012 ASSERT(num_bytes
<= btrfs_super_total_bytes(fs_info
->super_copy
));
1014 inode_should_defrag(inode
, start
, end
, num_bytes
, SZ_64K
);
1017 /* lets try to make an inline extent */
1018 ret
= cow_file_range_inline(inode
, start
, end
, 0,
1019 BTRFS_COMPRESS_NONE
, NULL
);
1022 * We use DO_ACCOUNTING here because we need the
1023 * delalloc_release_metadata to be run _after_ we drop
1024 * our outstanding extent for clearing delalloc for this
1027 extent_clear_unlock_delalloc(inode
, start
, end
, NULL
,
1028 EXTENT_LOCKED
| EXTENT_DELALLOC
|
1029 EXTENT_DELALLOC_NEW
| EXTENT_DEFRAG
|
1030 EXTENT_DO_ACCOUNTING
, PAGE_UNLOCK
|
1031 PAGE_CLEAR_DIRTY
| PAGE_SET_WRITEBACK
|
1032 PAGE_END_WRITEBACK
);
1033 *nr_written
= *nr_written
+
1034 (end
- start
+ PAGE_SIZE
) / PAGE_SIZE
;
1037 } else if (ret
< 0) {
1042 alloc_hint
= get_extent_allocation_hint(inode
, start
, num_bytes
);
1043 btrfs_drop_extent_cache(inode
, start
, start
+ num_bytes
- 1, 0);
1046 * Relocation relies on the relocated extents to have exactly the same
1047 * size as the original extents. Normally writeback for relocation data
1048 * extents follows a NOCOW path because relocation preallocates the
1049 * extents. However, due to an operation such as scrub turning a block
1050 * group to RO mode, it may fallback to COW mode, so we must make sure
1051 * an extent allocated during COW has exactly the requested size and can
1052 * not be split into smaller extents, otherwise relocation breaks and
1053 * fails during the stage where it updates the bytenr of file extent
1056 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
)
1057 min_alloc_size
= num_bytes
;
1059 min_alloc_size
= fs_info
->sectorsize
;
1061 while (num_bytes
> 0) {
1062 cur_alloc_size
= num_bytes
;
1063 ret
= btrfs_reserve_extent(root
, cur_alloc_size
, cur_alloc_size
,
1064 min_alloc_size
, 0, alloc_hint
,
1068 cur_alloc_size
= ins
.offset
;
1069 extent_reserved
= true;
1071 ram_size
= ins
.offset
;
1072 em
= create_io_em(inode
, start
, ins
.offset
, /* len */
1073 start
, /* orig_start */
1074 ins
.objectid
, /* block_start */
1075 ins
.offset
, /* block_len */
1076 ins
.offset
, /* orig_block_len */
1077 ram_size
, /* ram_bytes */
1078 BTRFS_COMPRESS_NONE
, /* compress_type */
1079 BTRFS_ORDERED_REGULAR
/* type */);
1084 free_extent_map(em
);
1086 ret
= btrfs_add_ordered_extent(inode
, start
, ins
.objectid
,
1087 ram_size
, cur_alloc_size
, 0);
1089 goto out_drop_extent_cache
;
1091 if (root
->root_key
.objectid
==
1092 BTRFS_DATA_RELOC_TREE_OBJECTID
) {
1093 ret
= btrfs_reloc_clone_csums(inode
, start
,
1096 * Only drop cache here, and process as normal.
1098 * We must not allow extent_clear_unlock_delalloc()
1099 * at out_unlock label to free meta of this ordered
1100 * extent, as its meta should be freed by
1101 * btrfs_finish_ordered_io().
1103 * So we must continue until @start is increased to
1104 * skip current ordered extent.
1107 btrfs_drop_extent_cache(inode
, start
,
1108 start
+ ram_size
- 1, 0);
1111 btrfs_dec_block_group_reservations(fs_info
, ins
.objectid
);
1113 /* we're not doing compressed IO, don't unlock the first
1114 * page (which the caller expects to stay locked), don't
1115 * clear any dirty bits and don't set any writeback bits
1117 * Do set the Private2 bit so we know this page was properly
1118 * setup for writepage
1120 page_ops
= unlock
? PAGE_UNLOCK
: 0;
1121 page_ops
|= PAGE_SET_PRIVATE2
;
1123 extent_clear_unlock_delalloc(inode
, start
, start
+ ram_size
- 1,
1125 EXTENT_LOCKED
| EXTENT_DELALLOC
,
1127 if (num_bytes
< cur_alloc_size
)
1130 num_bytes
-= cur_alloc_size
;
1131 alloc_hint
= ins
.objectid
+ ins
.offset
;
1132 start
+= cur_alloc_size
;
1133 extent_reserved
= false;
1136 * btrfs_reloc_clone_csums() error, since start is increased
1137 * extent_clear_unlock_delalloc() at out_unlock label won't
1138 * free metadata of current ordered extent, we're OK to exit.
1146 out_drop_extent_cache
:
1147 btrfs_drop_extent_cache(inode
, start
, start
+ ram_size
- 1, 0);
1149 btrfs_dec_block_group_reservations(fs_info
, ins
.objectid
);
1150 btrfs_free_reserved_extent(fs_info
, ins
.objectid
, ins
.offset
, 1);
1152 clear_bits
= EXTENT_LOCKED
| EXTENT_DELALLOC
| EXTENT_DELALLOC_NEW
|
1153 EXTENT_DEFRAG
| EXTENT_CLEAR_META_RESV
;
1154 page_ops
= PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
| PAGE_SET_WRITEBACK
|
1157 * If we reserved an extent for our delalloc range (or a subrange) and
1158 * failed to create the respective ordered extent, then it means that
1159 * when we reserved the extent we decremented the extent's size from
1160 * the data space_info's bytes_may_use counter and incremented the
1161 * space_info's bytes_reserved counter by the same amount. We must make
1162 * sure extent_clear_unlock_delalloc() does not try to decrement again
1163 * the data space_info's bytes_may_use counter, therefore we do not pass
1164 * it the flag EXTENT_CLEAR_DATA_RESV.
1166 if (extent_reserved
) {
1167 extent_clear_unlock_delalloc(inode
, start
,
1168 start
+ cur_alloc_size
- 1,
1172 start
+= cur_alloc_size
;
1176 extent_clear_unlock_delalloc(inode
, start
, end
, locked_page
,
1177 clear_bits
| EXTENT_CLEAR_DATA_RESV
,
1183 * work queue call back to started compression on a file and pages
1185 static noinline
void async_cow_start(struct btrfs_work
*work
)
1187 struct async_chunk
*async_chunk
;
1188 int compressed_extents
;
1190 async_chunk
= container_of(work
, struct async_chunk
, work
);
1192 compressed_extents
= compress_file_range(async_chunk
);
1193 if (compressed_extents
== 0) {
1194 btrfs_add_delayed_iput(async_chunk
->inode
);
1195 async_chunk
->inode
= NULL
;
1200 * work queue call back to submit previously compressed pages
1202 static noinline
void async_cow_submit(struct btrfs_work
*work
)
1204 struct async_chunk
*async_chunk
= container_of(work
, struct async_chunk
,
1206 struct btrfs_fs_info
*fs_info
= btrfs_work_owner(work
);
1207 unsigned long nr_pages
;
1209 nr_pages
= (async_chunk
->end
- async_chunk
->start
+ PAGE_SIZE
) >>
1212 /* atomic_sub_return implies a barrier */
1213 if (atomic_sub_return(nr_pages
, &fs_info
->async_delalloc_pages
) <
1215 cond_wake_up_nomb(&fs_info
->async_submit_wait
);
1218 * ->inode could be NULL if async_chunk_start has failed to compress,
1219 * in which case we don't have anything to submit, yet we need to
1220 * always adjust ->async_delalloc_pages as its paired with the init
1221 * happening in cow_file_range_async
1223 if (async_chunk
->inode
)
1224 submit_compressed_extents(async_chunk
);
1227 static noinline
void async_cow_free(struct btrfs_work
*work
)
1229 struct async_chunk
*async_chunk
;
1231 async_chunk
= container_of(work
, struct async_chunk
, work
);
1232 if (async_chunk
->inode
)
1233 btrfs_add_delayed_iput(async_chunk
->inode
);
1234 if (async_chunk
->blkcg_css
)
1235 css_put(async_chunk
->blkcg_css
);
1237 * Since the pointer to 'pending' is at the beginning of the array of
1238 * async_chunk's, freeing it ensures the whole array has been freed.
1240 if (atomic_dec_and_test(async_chunk
->pending
))
1241 kvfree(async_chunk
->pending
);
1244 static int cow_file_range_async(struct btrfs_inode
*inode
,
1245 struct writeback_control
*wbc
,
1246 struct page
*locked_page
,
1247 u64 start
, u64 end
, int *page_started
,
1248 unsigned long *nr_written
)
1250 struct btrfs_fs_info
*fs_info
= inode
->root
->fs_info
;
1251 struct cgroup_subsys_state
*blkcg_css
= wbc_blkcg_css(wbc
);
1252 struct async_cow
*ctx
;
1253 struct async_chunk
*async_chunk
;
1254 unsigned long nr_pages
;
1256 u64 num_chunks
= DIV_ROUND_UP(end
- start
, SZ_512K
);
1258 bool should_compress
;
1260 const unsigned int write_flags
= wbc_to_write_flags(wbc
);
1262 unlock_extent(&inode
->io_tree
, start
, end
);
1264 if (inode
->flags
& BTRFS_INODE_NOCOMPRESS
&&
1265 !btrfs_test_opt(fs_info
, FORCE_COMPRESS
)) {
1267 should_compress
= false;
1269 should_compress
= true;
1272 nofs_flag
= memalloc_nofs_save();
1273 ctx
= kvmalloc(struct_size(ctx
, chunks
, num_chunks
), GFP_KERNEL
);
1274 memalloc_nofs_restore(nofs_flag
);
1277 unsigned clear_bits
= EXTENT_LOCKED
| EXTENT_DELALLOC
|
1278 EXTENT_DELALLOC_NEW
| EXTENT_DEFRAG
|
1279 EXTENT_DO_ACCOUNTING
;
1280 unsigned long page_ops
= PAGE_UNLOCK
| PAGE_CLEAR_DIRTY
|
1281 PAGE_SET_WRITEBACK
| PAGE_END_WRITEBACK
|
1284 extent_clear_unlock_delalloc(inode
, start
, end
, locked_page
,
1285 clear_bits
, page_ops
);
1289 async_chunk
= ctx
->chunks
;
1290 atomic_set(&ctx
->num_chunks
, num_chunks
);
1292 for (i
= 0; i
< num_chunks
; i
++) {
1293 if (should_compress
)
1294 cur_end
= min(end
, start
+ SZ_512K
- 1);
1299 * igrab is called higher up in the call chain, take only the
1300 * lightweight reference for the callback lifetime
1302 ihold(&inode
->vfs_inode
);
1303 async_chunk
[i
].pending
= &ctx
->num_chunks
;
1304 async_chunk
[i
].inode
= &inode
->vfs_inode
;
1305 async_chunk
[i
].start
= start
;
1306 async_chunk
[i
].end
= cur_end
;
1307 async_chunk
[i
].write_flags
= write_flags
;
1308 INIT_LIST_HEAD(&async_chunk
[i
].extents
);
1311 * The locked_page comes all the way from writepage and its
1312 * the original page we were actually given. As we spread
1313 * this large delalloc region across multiple async_chunk
1314 * structs, only the first struct needs a pointer to locked_page
1316 * This way we don't need racey decisions about who is supposed
1321 * Depending on the compressibility, the pages might or
1322 * might not go through async. We want all of them to
1323 * be accounted against wbc once. Let's do it here
1324 * before the paths diverge. wbc accounting is used
1325 * only for foreign writeback detection and doesn't
1326 * need full accuracy. Just account the whole thing
1327 * against the first page.
1329 wbc_account_cgroup_owner(wbc
, locked_page
,
1331 async_chunk
[i
].locked_page
= locked_page
;
1334 async_chunk
[i
].locked_page
= NULL
;
1337 if (blkcg_css
!= blkcg_root_css
) {
1339 async_chunk
[i
].blkcg_css
= blkcg_css
;
1341 async_chunk
[i
].blkcg_css
= NULL
;
1344 btrfs_init_work(&async_chunk
[i
].work
, async_cow_start
,
1345 async_cow_submit
, async_cow_free
);
1347 nr_pages
= DIV_ROUND_UP(cur_end
- start
, PAGE_SIZE
);
1348 atomic_add(nr_pages
, &fs_info
->async_delalloc_pages
);
1350 btrfs_queue_work(fs_info
->delalloc_workers
, &async_chunk
[i
].work
);
1352 *nr_written
+= nr_pages
;
1353 start
= cur_end
+ 1;
1359 static noinline
int csum_exist_in_range(struct btrfs_fs_info
*fs_info
,
1360 u64 bytenr
, u64 num_bytes
)
1363 struct btrfs_ordered_sum
*sums
;
1366 ret
= btrfs_lookup_csums_range(fs_info
->csum_root
, bytenr
,
1367 bytenr
+ num_bytes
- 1, &list
, 0);
1368 if (ret
== 0 && list_empty(&list
))
1371 while (!list_empty(&list
)) {
1372 sums
= list_entry(list
.next
, struct btrfs_ordered_sum
, list
);
1373 list_del(&sums
->list
);
1381 static int fallback_to_cow(struct btrfs_inode
*inode
, struct page
*locked_page
,
1382 const u64 start
, const u64 end
,
1383 int *page_started
, unsigned long *nr_written
)
1385 const bool is_space_ino
= btrfs_is_free_space_inode(inode
);
1386 const bool is_reloc_ino
= (inode
->root
->root_key
.objectid
==
1387 BTRFS_DATA_RELOC_TREE_OBJECTID
);
1388 const u64 range_bytes
= end
+ 1 - start
;
1389 struct extent_io_tree
*io_tree
= &inode
->io_tree
;
1390 u64 range_start
= start
;
1394 * If EXTENT_NORESERVE is set it means that when the buffered write was
1395 * made we had not enough available data space and therefore we did not
1396 * reserve data space for it, since we though we could do NOCOW for the
1397 * respective file range (either there is prealloc extent or the inode
1398 * has the NOCOW bit set).
1400 * However when we need to fallback to COW mode (because for example the
1401 * block group for the corresponding extent was turned to RO mode by a
1402 * scrub or relocation) we need to do the following:
1404 * 1) We increment the bytes_may_use counter of the data space info.
1405 * If COW succeeds, it allocates a new data extent and after doing
1406 * that it decrements the space info's bytes_may_use counter and
1407 * increments its bytes_reserved counter by the same amount (we do
1408 * this at btrfs_add_reserved_bytes()). So we need to increment the
1409 * bytes_may_use counter to compensate (when space is reserved at
1410 * buffered write time, the bytes_may_use counter is incremented);
1412 * 2) We clear the EXTENT_NORESERVE bit from the range. We do this so
1413 * that if the COW path fails for any reason, it decrements (through
1414 * extent_clear_unlock_delalloc()) the bytes_may_use counter of the
1415 * data space info, which we incremented in the step above.
1417 * If we need to fallback to cow and the inode corresponds to a free
1418 * space cache inode or an inode of the data relocation tree, we must
1419 * also increment bytes_may_use of the data space_info for the same
1420 * reason. Space caches and relocated data extents always get a prealloc
1421 * extent for them, however scrub or balance may have set the block
1422 * group that contains that extent to RO mode and therefore force COW
1423 * when starting writeback.
1425 count
= count_range_bits(io_tree
, &range_start
, end
, range_bytes
,
1426 EXTENT_NORESERVE
, 0);
1427 if (count
> 0 || is_space_ino
|| is_reloc_ino
) {
1429 struct btrfs_fs_info
*fs_info
= inode
->root
->fs_info
;
1430 struct btrfs_space_info
*sinfo
= fs_info
->data_sinfo
;
1432 if (is_space_ino
|| is_reloc_ino
)
1433 bytes
= range_bytes
;
1435 spin_lock(&sinfo
->lock
);
1436 btrfs_space_info_update_bytes_may_use(fs_info
, sinfo
, bytes
);
1437 spin_unlock(&sinfo
->lock
);
1440 clear_extent_bit(io_tree
, start
, end
, EXTENT_NORESERVE
,
1444 return cow_file_range(inode
, locked_page
, start
, end
, page_started
,
1449 * when nowcow writeback call back. This checks for snapshots or COW copies
1450 * of the extents that exist in the file, and COWs the file as required.
1452 * If no cow copies or snapshots exist, we write directly to the existing
1455 static noinline
int run_delalloc_nocow(struct btrfs_inode
*inode
,
1456 struct page
*locked_page
,
1457 const u64 start
, const u64 end
,
1458 int *page_started
, int force
,
1459 unsigned long *nr_written
)
1461 struct btrfs_fs_info
*fs_info
= inode
->root
->fs_info
;
1462 struct btrfs_root
*root
= inode
->root
;
1463 struct btrfs_path
*path
;
1464 u64 cow_start
= (u64
)-1;
1465 u64 cur_offset
= start
;
1467 bool check_prev
= true;
1468 const bool freespace_inode
= btrfs_is_free_space_inode(inode
);
1469 u64 ino
= btrfs_ino(inode
);
1471 u64 disk_bytenr
= 0;
1473 path
= btrfs_alloc_path();
1475 extent_clear_unlock_delalloc(inode
, start
, end
, locked_page
,
1476 EXTENT_LOCKED
| EXTENT_DELALLOC
|
1477 EXTENT_DO_ACCOUNTING
|
1478 EXTENT_DEFRAG
, PAGE_UNLOCK
|
1480 PAGE_SET_WRITEBACK
|
1481 PAGE_END_WRITEBACK
);
1486 struct btrfs_key found_key
;
1487 struct btrfs_file_extent_item
*fi
;
1488 struct extent_buffer
*leaf
;
1498 ret
= btrfs_lookup_file_extent(NULL
, root
, path
, ino
,
1504 * If there is no extent for our range when doing the initial
1505 * search, then go back to the previous slot as it will be the
1506 * one containing the search offset
1508 if (ret
> 0 && path
->slots
[0] > 0 && check_prev
) {
1509 leaf
= path
->nodes
[0];
1510 btrfs_item_key_to_cpu(leaf
, &found_key
,
1511 path
->slots
[0] - 1);
1512 if (found_key
.objectid
== ino
&&
1513 found_key
.type
== BTRFS_EXTENT_DATA_KEY
)
1518 /* Go to next leaf if we have exhausted the current one */
1519 leaf
= path
->nodes
[0];
1520 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
1521 ret
= btrfs_next_leaf(root
, path
);
1523 if (cow_start
!= (u64
)-1)
1524 cur_offset
= cow_start
;
1529 leaf
= path
->nodes
[0];
1532 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1534 /* Didn't find anything for our INO */
1535 if (found_key
.objectid
> ino
)
1538 * Keep searching until we find an EXTENT_ITEM or there are no
1539 * more extents for this inode
1541 if (WARN_ON_ONCE(found_key
.objectid
< ino
) ||
1542 found_key
.type
< BTRFS_EXTENT_DATA_KEY
) {
1547 /* Found key is not EXTENT_DATA_KEY or starts after req range */
1548 if (found_key
.type
> BTRFS_EXTENT_DATA_KEY
||
1549 found_key
.offset
> end
)
1553 * If the found extent starts after requested offset, then
1554 * adjust extent_end to be right before this extent begins
1556 if (found_key
.offset
> cur_offset
) {
1557 extent_end
= found_key
.offset
;
1563 * Found extent which begins before our range and potentially
1566 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
1567 struct btrfs_file_extent_item
);
1568 extent_type
= btrfs_file_extent_type(leaf
, fi
);
1570 ram_bytes
= btrfs_file_extent_ram_bytes(leaf
, fi
);
1571 if (extent_type
== BTRFS_FILE_EXTENT_REG
||
1572 extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1573 disk_bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
1574 extent_offset
= btrfs_file_extent_offset(leaf
, fi
);
1575 extent_end
= found_key
.offset
+
1576 btrfs_file_extent_num_bytes(leaf
, fi
);
1578 btrfs_file_extent_disk_num_bytes(leaf
, fi
);
1580 * If the extent we got ends before our current offset,
1581 * skip to the next extent.
1583 if (extent_end
<= cur_offset
) {
1588 if (disk_bytenr
== 0)
1590 /* Skip compressed/encrypted/encoded extents */
1591 if (btrfs_file_extent_compression(leaf
, fi
) ||
1592 btrfs_file_extent_encryption(leaf
, fi
) ||
1593 btrfs_file_extent_other_encoding(leaf
, fi
))
1596 * If extent is created before the last volume's snapshot
1597 * this implies the extent is shared, hence we can't do
1598 * nocow. This is the same check as in
1599 * btrfs_cross_ref_exist but without calling
1600 * btrfs_search_slot.
1602 if (!freespace_inode
&&
1603 btrfs_file_extent_generation(leaf
, fi
) <=
1604 btrfs_root_last_snapshot(&root
->root_item
))
1606 if (extent_type
== BTRFS_FILE_EXTENT_REG
&& !force
)
1608 /* If extent is RO, we must COW it */
1609 if (btrfs_extent_readonly(fs_info
, disk_bytenr
))
1611 ret
= btrfs_cross_ref_exist(root
, ino
,
1613 extent_offset
, disk_bytenr
, false);
1616 * ret could be -EIO if the above fails to read
1620 if (cow_start
!= (u64
)-1)
1621 cur_offset
= cow_start
;
1625 WARN_ON_ONCE(freespace_inode
);
1628 disk_bytenr
+= extent_offset
;
1629 disk_bytenr
+= cur_offset
- found_key
.offset
;
1630 num_bytes
= min(end
+ 1, extent_end
) - cur_offset
;
1632 * If there are pending snapshots for this root, we
1633 * fall into common COW way
1635 if (!freespace_inode
&& atomic_read(&root
->snapshot_force_cow
))
1638 * force cow if csum exists in the range.
1639 * this ensure that csum for a given extent are
1640 * either valid or do not exist.
1642 ret
= csum_exist_in_range(fs_info
, disk_bytenr
,
1646 * ret could be -EIO if the above fails to read
1650 if (cow_start
!= (u64
)-1)
1651 cur_offset
= cow_start
;
1654 WARN_ON_ONCE(freespace_inode
);
1657 if (!btrfs_inc_nocow_writers(fs_info
, disk_bytenr
))
1660 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
1661 extent_end
= found_key
.offset
+ ram_bytes
;
1662 extent_end
= ALIGN(extent_end
, fs_info
->sectorsize
);
1663 /* Skip extents outside of our requested range */
1664 if (extent_end
<= start
) {
1669 /* If this triggers then we have a memory corruption */
1674 * If nocow is false then record the beginning of the range
1675 * that needs to be COWed
1678 if (cow_start
== (u64
)-1)
1679 cow_start
= cur_offset
;
1680 cur_offset
= extent_end
;
1681 if (cur_offset
> end
)
1687 btrfs_release_path(path
);
1690 * COW range from cow_start to found_key.offset - 1. As the key
1691 * will contain the beginning of the first extent that can be
1692 * NOCOW, following one which needs to be COW'ed
1694 if (cow_start
!= (u64
)-1) {
1695 ret
= fallback_to_cow(inode
, locked_page
,
1696 cow_start
, found_key
.offset
- 1,
1697 page_started
, nr_written
);
1700 cow_start
= (u64
)-1;
1703 if (extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
1704 u64 orig_start
= found_key
.offset
- extent_offset
;
1705 struct extent_map
*em
;
1707 em
= create_io_em(inode
, cur_offset
, num_bytes
,
1709 disk_bytenr
, /* block_start */
1710 num_bytes
, /* block_len */
1711 disk_num_bytes
, /* orig_block_len */
1712 ram_bytes
, BTRFS_COMPRESS_NONE
,
1713 BTRFS_ORDERED_PREALLOC
);
1718 free_extent_map(em
);
1719 ret
= btrfs_add_ordered_extent(inode
, cur_offset
,
1720 disk_bytenr
, num_bytes
,
1722 BTRFS_ORDERED_PREALLOC
);
1724 btrfs_drop_extent_cache(inode
, cur_offset
,
1725 cur_offset
+ num_bytes
- 1,
1730 ret
= btrfs_add_ordered_extent(inode
, cur_offset
,
1731 disk_bytenr
, num_bytes
,
1733 BTRFS_ORDERED_NOCOW
);
1739 btrfs_dec_nocow_writers(fs_info
, disk_bytenr
);
1742 if (root
->root_key
.objectid
==
1743 BTRFS_DATA_RELOC_TREE_OBJECTID
)
1745 * Error handled later, as we must prevent
1746 * extent_clear_unlock_delalloc() in error handler
1747 * from freeing metadata of created ordered extent.
1749 ret
= btrfs_reloc_clone_csums(inode
, cur_offset
,
1752 extent_clear_unlock_delalloc(inode
, cur_offset
,
1753 cur_offset
+ num_bytes
- 1,
1754 locked_page
, EXTENT_LOCKED
|
1756 EXTENT_CLEAR_DATA_RESV
,
1757 PAGE_UNLOCK
| PAGE_SET_PRIVATE2
);
1759 cur_offset
= extent_end
;
1762 * btrfs_reloc_clone_csums() error, now we're OK to call error
1763 * handler, as metadata for created ordered extent will only
1764 * be freed by btrfs_finish_ordered_io().
1768 if (cur_offset
> end
)
1771 btrfs_release_path(path
);
1773 if (cur_offset
<= end
&& cow_start
== (u64
)-1)
1774 cow_start
= cur_offset
;
1776 if (cow_start
!= (u64
)-1) {
1778 ret
= fallback_to_cow(inode
, locked_page
, cow_start
, end
,
1779 page_started
, nr_written
);
1786 btrfs_dec_nocow_writers(fs_info
, disk_bytenr
);
1788 if (ret
&& cur_offset
< end
)
1789 extent_clear_unlock_delalloc(inode
, cur_offset
, end
,
1790 locked_page
, EXTENT_LOCKED
|
1791 EXTENT_DELALLOC
| EXTENT_DEFRAG
|
1792 EXTENT_DO_ACCOUNTING
, PAGE_UNLOCK
|
1794 PAGE_SET_WRITEBACK
|
1795 PAGE_END_WRITEBACK
);
1796 btrfs_free_path(path
);
1800 static inline int need_force_cow(struct btrfs_inode
*inode
, u64 start
, u64 end
)
1803 if (!(inode
->flags
& BTRFS_INODE_NODATACOW
) &&
1804 !(inode
->flags
& BTRFS_INODE_PREALLOC
))
1808 * @defrag_bytes is a hint value, no spinlock held here,
1809 * if is not zero, it means the file is defragging.
1810 * Force cow if given extent needs to be defragged.
1812 if (inode
->defrag_bytes
&&
1813 test_range_bit(&inode
->io_tree
, start
, end
, EXTENT_DEFRAG
, 0, NULL
))
1820 * Function to process delayed allocation (create CoW) for ranges which are
1821 * being touched for the first time.
1823 int btrfs_run_delalloc_range(struct btrfs_inode
*inode
, struct page
*locked_page
,
1824 u64 start
, u64 end
, int *page_started
, unsigned long *nr_written
,
1825 struct writeback_control
*wbc
)
1828 int force_cow
= need_force_cow(inode
, start
, end
);
1830 if (inode
->flags
& BTRFS_INODE_NODATACOW
&& !force_cow
) {
1831 ret
= run_delalloc_nocow(inode
, locked_page
, start
, end
,
1832 page_started
, 1, nr_written
);
1833 } else if (inode
->flags
& BTRFS_INODE_PREALLOC
&& !force_cow
) {
1834 ret
= run_delalloc_nocow(inode
, locked_page
, start
, end
,
1835 page_started
, 0, nr_written
);
1836 } else if (!inode_can_compress(inode
) ||
1837 !inode_need_compress(inode
, start
, end
)) {
1838 ret
= cow_file_range(inode
, locked_page
, start
, end
,
1839 page_started
, nr_written
, 1);
1841 set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
, &inode
->runtime_flags
);
1842 ret
= cow_file_range_async(inode
, wbc
, locked_page
, start
, end
,
1843 page_started
, nr_written
);
1846 btrfs_cleanup_ordered_extents(inode
, locked_page
, start
,
1851 void btrfs_split_delalloc_extent(struct inode
*inode
,
1852 struct extent_state
*orig
, u64 split
)
1856 /* not delalloc, ignore it */
1857 if (!(orig
->state
& EXTENT_DELALLOC
))
1860 size
= orig
->end
- orig
->start
+ 1;
1861 if (size
> BTRFS_MAX_EXTENT_SIZE
) {
1866 * See the explanation in btrfs_merge_delalloc_extent, the same
1867 * applies here, just in reverse.
1869 new_size
= orig
->end
- split
+ 1;
1870 num_extents
= count_max_extents(new_size
);
1871 new_size
= split
- orig
->start
;
1872 num_extents
+= count_max_extents(new_size
);
1873 if (count_max_extents(size
) >= num_extents
)
1877 spin_lock(&BTRFS_I(inode
)->lock
);
1878 btrfs_mod_outstanding_extents(BTRFS_I(inode
), 1);
1879 spin_unlock(&BTRFS_I(inode
)->lock
);
1883 * Handle merged delayed allocation extents so we can keep track of new extents
1884 * that are just merged onto old extents, such as when we are doing sequential
1885 * writes, so we can properly account for the metadata space we'll need.
1887 void btrfs_merge_delalloc_extent(struct inode
*inode
, struct extent_state
*new,
1888 struct extent_state
*other
)
1890 u64 new_size
, old_size
;
1893 /* not delalloc, ignore it */
1894 if (!(other
->state
& EXTENT_DELALLOC
))
1897 if (new->start
> other
->start
)
1898 new_size
= new->end
- other
->start
+ 1;
1900 new_size
= other
->end
- new->start
+ 1;
1902 /* we're not bigger than the max, unreserve the space and go */
1903 if (new_size
<= BTRFS_MAX_EXTENT_SIZE
) {
1904 spin_lock(&BTRFS_I(inode
)->lock
);
1905 btrfs_mod_outstanding_extents(BTRFS_I(inode
), -1);
1906 spin_unlock(&BTRFS_I(inode
)->lock
);
1911 * We have to add up either side to figure out how many extents were
1912 * accounted for before we merged into one big extent. If the number of
1913 * extents we accounted for is <= the amount we need for the new range
1914 * then we can return, otherwise drop. Think of it like this
1918 * So we've grown the extent by a MAX_SIZE extent, this would mean we
1919 * need 2 outstanding extents, on one side we have 1 and the other side
1920 * we have 1 so they are == and we can return. But in this case
1922 * [MAX_SIZE+4k][MAX_SIZE+4k]
1924 * Each range on their own accounts for 2 extents, but merged together
1925 * they are only 3 extents worth of accounting, so we need to drop in
1928 old_size
= other
->end
- other
->start
+ 1;
1929 num_extents
= count_max_extents(old_size
);
1930 old_size
= new->end
- new->start
+ 1;
1931 num_extents
+= count_max_extents(old_size
);
1932 if (count_max_extents(new_size
) >= num_extents
)
1935 spin_lock(&BTRFS_I(inode
)->lock
);
1936 btrfs_mod_outstanding_extents(BTRFS_I(inode
), -1);
1937 spin_unlock(&BTRFS_I(inode
)->lock
);
1940 static void btrfs_add_delalloc_inodes(struct btrfs_root
*root
,
1941 struct inode
*inode
)
1943 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
1945 spin_lock(&root
->delalloc_lock
);
1946 if (list_empty(&BTRFS_I(inode
)->delalloc_inodes
)) {
1947 list_add_tail(&BTRFS_I(inode
)->delalloc_inodes
,
1948 &root
->delalloc_inodes
);
1949 set_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1950 &BTRFS_I(inode
)->runtime_flags
);
1951 root
->nr_delalloc_inodes
++;
1952 if (root
->nr_delalloc_inodes
== 1) {
1953 spin_lock(&fs_info
->delalloc_root_lock
);
1954 BUG_ON(!list_empty(&root
->delalloc_root
));
1955 list_add_tail(&root
->delalloc_root
,
1956 &fs_info
->delalloc_roots
);
1957 spin_unlock(&fs_info
->delalloc_root_lock
);
1960 spin_unlock(&root
->delalloc_lock
);
1964 void __btrfs_del_delalloc_inode(struct btrfs_root
*root
,
1965 struct btrfs_inode
*inode
)
1967 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1969 if (!list_empty(&inode
->delalloc_inodes
)) {
1970 list_del_init(&inode
->delalloc_inodes
);
1971 clear_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
1972 &inode
->runtime_flags
);
1973 root
->nr_delalloc_inodes
--;
1974 if (!root
->nr_delalloc_inodes
) {
1975 ASSERT(list_empty(&root
->delalloc_inodes
));
1976 spin_lock(&fs_info
->delalloc_root_lock
);
1977 BUG_ON(list_empty(&root
->delalloc_root
));
1978 list_del_init(&root
->delalloc_root
);
1979 spin_unlock(&fs_info
->delalloc_root_lock
);
1984 static void btrfs_del_delalloc_inode(struct btrfs_root
*root
,
1985 struct btrfs_inode
*inode
)
1987 spin_lock(&root
->delalloc_lock
);
1988 __btrfs_del_delalloc_inode(root
, inode
);
1989 spin_unlock(&root
->delalloc_lock
);
1993 * Properly track delayed allocation bytes in the inode and to maintain the
1994 * list of inodes that have pending delalloc work to be done.
1996 void btrfs_set_delalloc_extent(struct inode
*inode
, struct extent_state
*state
,
1999 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
2001 if ((*bits
& EXTENT_DEFRAG
) && !(*bits
& EXTENT_DELALLOC
))
2004 * set_bit and clear bit hooks normally require _irqsave/restore
2005 * but in this case, we are only testing for the DELALLOC
2006 * bit, which is only set or cleared with irqs on
2008 if (!(state
->state
& EXTENT_DELALLOC
) && (*bits
& EXTENT_DELALLOC
)) {
2009 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2010 u64 len
= state
->end
+ 1 - state
->start
;
2011 u32 num_extents
= count_max_extents(len
);
2012 bool do_list
= !btrfs_is_free_space_inode(BTRFS_I(inode
));
2014 spin_lock(&BTRFS_I(inode
)->lock
);
2015 btrfs_mod_outstanding_extents(BTRFS_I(inode
), num_extents
);
2016 spin_unlock(&BTRFS_I(inode
)->lock
);
2018 /* For sanity tests */
2019 if (btrfs_is_testing(fs_info
))
2022 percpu_counter_add_batch(&fs_info
->delalloc_bytes
, len
,
2023 fs_info
->delalloc_batch
);
2024 spin_lock(&BTRFS_I(inode
)->lock
);
2025 BTRFS_I(inode
)->delalloc_bytes
+= len
;
2026 if (*bits
& EXTENT_DEFRAG
)
2027 BTRFS_I(inode
)->defrag_bytes
+= len
;
2028 if (do_list
&& !test_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
2029 &BTRFS_I(inode
)->runtime_flags
))
2030 btrfs_add_delalloc_inodes(root
, inode
);
2031 spin_unlock(&BTRFS_I(inode
)->lock
);
2034 if (!(state
->state
& EXTENT_DELALLOC_NEW
) &&
2035 (*bits
& EXTENT_DELALLOC_NEW
)) {
2036 spin_lock(&BTRFS_I(inode
)->lock
);
2037 BTRFS_I(inode
)->new_delalloc_bytes
+= state
->end
+ 1 -
2039 spin_unlock(&BTRFS_I(inode
)->lock
);
2044 * Once a range is no longer delalloc this function ensures that proper
2045 * accounting happens.
2047 void btrfs_clear_delalloc_extent(struct inode
*vfs_inode
,
2048 struct extent_state
*state
, unsigned *bits
)
2050 struct btrfs_inode
*inode
= BTRFS_I(vfs_inode
);
2051 struct btrfs_fs_info
*fs_info
= btrfs_sb(vfs_inode
->i_sb
);
2052 u64 len
= state
->end
+ 1 - state
->start
;
2053 u32 num_extents
= count_max_extents(len
);
2055 if ((state
->state
& EXTENT_DEFRAG
) && (*bits
& EXTENT_DEFRAG
)) {
2056 spin_lock(&inode
->lock
);
2057 inode
->defrag_bytes
-= len
;
2058 spin_unlock(&inode
->lock
);
2062 * set_bit and clear bit hooks normally require _irqsave/restore
2063 * but in this case, we are only testing for the DELALLOC
2064 * bit, which is only set or cleared with irqs on
2066 if ((state
->state
& EXTENT_DELALLOC
) && (*bits
& EXTENT_DELALLOC
)) {
2067 struct btrfs_root
*root
= inode
->root
;
2068 bool do_list
= !btrfs_is_free_space_inode(inode
);
2070 spin_lock(&inode
->lock
);
2071 btrfs_mod_outstanding_extents(inode
, -num_extents
);
2072 spin_unlock(&inode
->lock
);
2075 * We don't reserve metadata space for space cache inodes so we
2076 * don't need to call delalloc_release_metadata if there is an
2079 if (*bits
& EXTENT_CLEAR_META_RESV
&&
2080 root
!= fs_info
->tree_root
)
2081 btrfs_delalloc_release_metadata(inode
, len
, false);
2083 /* For sanity tests. */
2084 if (btrfs_is_testing(fs_info
))
2087 if (root
->root_key
.objectid
!= BTRFS_DATA_RELOC_TREE_OBJECTID
&&
2088 do_list
&& !(state
->state
& EXTENT_NORESERVE
) &&
2089 (*bits
& EXTENT_CLEAR_DATA_RESV
))
2090 btrfs_free_reserved_data_space_noquota(fs_info
, len
);
2092 percpu_counter_add_batch(&fs_info
->delalloc_bytes
, -len
,
2093 fs_info
->delalloc_batch
);
2094 spin_lock(&inode
->lock
);
2095 inode
->delalloc_bytes
-= len
;
2096 if (do_list
&& inode
->delalloc_bytes
== 0 &&
2097 test_bit(BTRFS_INODE_IN_DELALLOC_LIST
,
2098 &inode
->runtime_flags
))
2099 btrfs_del_delalloc_inode(root
, inode
);
2100 spin_unlock(&inode
->lock
);
2103 if ((state
->state
& EXTENT_DELALLOC_NEW
) &&
2104 (*bits
& EXTENT_DELALLOC_NEW
)) {
2105 spin_lock(&inode
->lock
);
2106 ASSERT(inode
->new_delalloc_bytes
>= len
);
2107 inode
->new_delalloc_bytes
-= len
;
2108 spin_unlock(&inode
->lock
);
2113 * btrfs_bio_fits_in_stripe - Checks whether the size of the given bio will fit
2114 * in a chunk's stripe. This function ensures that bios do not span a
2117 * @page - The page we are about to add to the bio
2118 * @size - size we want to add to the bio
2119 * @bio - bio we want to ensure is smaller than a stripe
2120 * @bio_flags - flags of the bio
2122 * return 1 if page cannot be added to the bio
2123 * return 0 if page can be added to the bio
2124 * return error otherwise
2126 int btrfs_bio_fits_in_stripe(struct page
*page
, size_t size
, struct bio
*bio
,
2127 unsigned long bio_flags
)
2129 struct inode
*inode
= page
->mapping
->host
;
2130 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
2131 u64 logical
= (u64
)bio
->bi_iter
.bi_sector
<< 9;
2135 struct btrfs_io_geometry geom
;
2137 if (bio_flags
& EXTENT_BIO_COMPRESSED
)
2140 length
= bio
->bi_iter
.bi_size
;
2141 map_length
= length
;
2142 ret
= btrfs_get_io_geometry(fs_info
, btrfs_op(bio
), logical
, map_length
,
2147 if (geom
.len
< length
+ size
)
2153 * in order to insert checksums into the metadata in large chunks,
2154 * we wait until bio submission time. All the pages in the bio are
2155 * checksummed and sums are attached onto the ordered extent record.
2157 * At IO completion time the cums attached on the ordered extent record
2158 * are inserted into the btree
2160 static blk_status_t
btrfs_submit_bio_start(void *private_data
, struct bio
*bio
,
2163 struct inode
*inode
= private_data
;
2165 return btrfs_csum_one_bio(BTRFS_I(inode
), bio
, 0, 0);
2169 * extent_io.c submission hook. This does the right thing for csum calculation
2170 * on write, or reading the csums from the tree before a read.
2172 * Rules about async/sync submit,
2173 * a) read: sync submit
2175 * b) write without checksum: sync submit
2177 * c) write with checksum:
2178 * c-1) if bio is issued by fsync: sync submit
2179 * (sync_writers != 0)
2181 * c-2) if root is reloc root: sync submit
2182 * (only in case of buffered IO)
2184 * c-3) otherwise: async submit
2186 static blk_status_t
btrfs_submit_bio_hook(struct inode
*inode
, struct bio
*bio
,
2188 unsigned long bio_flags
)
2191 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
2192 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2193 enum btrfs_wq_endio_type metadata
= BTRFS_WQ_ENDIO_DATA
;
2194 blk_status_t ret
= 0;
2196 int async
= !atomic_read(&BTRFS_I(inode
)->sync_writers
);
2198 skip_sum
= BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
;
2200 if (btrfs_is_free_space_inode(BTRFS_I(inode
)))
2201 metadata
= BTRFS_WQ_ENDIO_FREE_SPACE
;
2203 if (bio_op(bio
) != REQ_OP_WRITE
) {
2204 ret
= btrfs_bio_wq_end_io(fs_info
, bio
, metadata
);
2208 if (bio_flags
& EXTENT_BIO_COMPRESSED
) {
2209 ret
= btrfs_submit_compressed_read(inode
, bio
,
2213 } else if (!skip_sum
) {
2214 ret
= btrfs_lookup_bio_sums(inode
, bio
, (u64
)-1, NULL
);
2219 } else if (async
&& !skip_sum
) {
2220 /* csum items have already been cloned */
2221 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
)
2223 /* we're doing a write, do the async checksumming */
2224 ret
= btrfs_wq_submit_bio(fs_info
, bio
, mirror_num
, bio_flags
,
2225 0, inode
, btrfs_submit_bio_start
);
2227 } else if (!skip_sum
) {
2228 ret
= btrfs_csum_one_bio(BTRFS_I(inode
), bio
, 0, 0);
2234 ret
= btrfs_map_bio(fs_info
, bio
, mirror_num
);
2238 bio
->bi_status
= ret
;
2245 * given a list of ordered sums record them in the inode. This happens
2246 * at IO completion time based on sums calculated at bio submission time.
2248 static noinline
int add_pending_csums(struct btrfs_trans_handle
*trans
,
2249 struct inode
*inode
, struct list_head
*list
)
2251 struct btrfs_ordered_sum
*sum
;
2254 list_for_each_entry(sum
, list
, list
) {
2255 trans
->adding_csums
= true;
2256 ret
= btrfs_csum_file_blocks(trans
,
2257 BTRFS_I(inode
)->root
->fs_info
->csum_root
, sum
);
2258 trans
->adding_csums
= false;
2265 int btrfs_set_extent_delalloc(struct btrfs_inode
*inode
, u64 start
, u64 end
,
2266 unsigned int extra_bits
,
2267 struct extent_state
**cached_state
)
2269 WARN_ON(PAGE_ALIGNED(end
));
2270 return set_extent_delalloc(&inode
->io_tree
, start
, end
, extra_bits
,
2274 /* see btrfs_writepage_start_hook for details on why this is required */
2275 struct btrfs_writepage_fixup
{
2277 struct inode
*inode
;
2278 struct btrfs_work work
;
2281 static void btrfs_writepage_fixup_worker(struct btrfs_work
*work
)
2283 struct btrfs_writepage_fixup
*fixup
;
2284 struct btrfs_ordered_extent
*ordered
;
2285 struct extent_state
*cached_state
= NULL
;
2286 struct extent_changeset
*data_reserved
= NULL
;
2288 struct btrfs_inode
*inode
;
2292 bool free_delalloc_space
= true;
2294 fixup
= container_of(work
, struct btrfs_writepage_fixup
, work
);
2296 inode
= BTRFS_I(fixup
->inode
);
2297 page_start
= page_offset(page
);
2298 page_end
= page_offset(page
) + PAGE_SIZE
- 1;
2301 * This is similar to page_mkwrite, we need to reserve the space before
2302 * we take the page lock.
2304 ret
= btrfs_delalloc_reserve_space(inode
, &data_reserved
, page_start
,
2310 * Before we queued this fixup, we took a reference on the page.
2311 * page->mapping may go NULL, but it shouldn't be moved to a different
2314 if (!page
->mapping
|| !PageDirty(page
) || !PageChecked(page
)) {
2316 * Unfortunately this is a little tricky, either
2318 * 1) We got here and our page had already been dealt with and
2319 * we reserved our space, thus ret == 0, so we need to just
2320 * drop our space reservation and bail. This can happen the
2321 * first time we come into the fixup worker, or could happen
2322 * while waiting for the ordered extent.
2323 * 2) Our page was already dealt with, but we happened to get an
2324 * ENOSPC above from the btrfs_delalloc_reserve_space. In
2325 * this case we obviously don't have anything to release, but
2326 * because the page was already dealt with we don't want to
2327 * mark the page with an error, so make sure we're resetting
2328 * ret to 0. This is why we have this check _before_ the ret
2329 * check, because we do not want to have a surprise ENOSPC
2330 * when the page was already properly dealt with.
2333 btrfs_delalloc_release_extents(inode
, PAGE_SIZE
);
2334 btrfs_delalloc_release_space(inode
, data_reserved
,
2335 page_start
, PAGE_SIZE
,
2343 * We can't mess with the page state unless it is locked, so now that
2344 * it is locked bail if we failed to make our space reservation.
2349 lock_extent_bits(&inode
->io_tree
, page_start
, page_end
, &cached_state
);
2351 /* already ordered? We're done */
2352 if (PagePrivate2(page
))
2355 ordered
= btrfs_lookup_ordered_range(inode
, page_start
, PAGE_SIZE
);
2357 unlock_extent_cached(&inode
->io_tree
, page_start
, page_end
,
2360 btrfs_start_ordered_extent(&inode
->vfs_inode
, ordered
, 1);
2361 btrfs_put_ordered_extent(ordered
);
2365 ret
= btrfs_set_extent_delalloc(inode
, page_start
, page_end
, 0,
2371 * Everything went as planned, we're now the owner of a dirty page with
2372 * delayed allocation bits set and space reserved for our COW
2375 * The page was dirty when we started, nothing should have cleaned it.
2377 BUG_ON(!PageDirty(page
));
2378 free_delalloc_space
= false;
2380 btrfs_delalloc_release_extents(inode
, PAGE_SIZE
);
2381 if (free_delalloc_space
)
2382 btrfs_delalloc_release_space(inode
, data_reserved
, page_start
,
2384 unlock_extent_cached(&inode
->io_tree
, page_start
, page_end
,
2389 * We hit ENOSPC or other errors. Update the mapping and page
2390 * to reflect the errors and clean the page.
2392 mapping_set_error(page
->mapping
, ret
);
2393 end_extent_writepage(page
, ret
, page_start
, page_end
);
2394 clear_page_dirty_for_io(page
);
2397 ClearPageChecked(page
);
2401 extent_changeset_free(data_reserved
);
2403 * As a precaution, do a delayed iput in case it would be the last iput
2404 * that could need flushing space. Recursing back to fixup worker would
2407 btrfs_add_delayed_iput(&inode
->vfs_inode
);
2411 * There are a few paths in the higher layers of the kernel that directly
2412 * set the page dirty bit without asking the filesystem if it is a
2413 * good idea. This causes problems because we want to make sure COW
2414 * properly happens and the data=ordered rules are followed.
2416 * In our case any range that doesn't have the ORDERED bit set
2417 * hasn't been properly setup for IO. We kick off an async process
2418 * to fix it up. The async helper will wait for ordered extents, set
2419 * the delalloc bit and make it safe to write the page.
2421 int btrfs_writepage_cow_fixup(struct page
*page
, u64 start
, u64 end
)
2423 struct inode
*inode
= page
->mapping
->host
;
2424 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
2425 struct btrfs_writepage_fixup
*fixup
;
2427 /* this page is properly in the ordered list */
2428 if (TestClearPagePrivate2(page
))
2432 * PageChecked is set below when we create a fixup worker for this page,
2433 * don't try to create another one if we're already PageChecked()
2435 * The extent_io writepage code will redirty the page if we send back
2438 if (PageChecked(page
))
2441 fixup
= kzalloc(sizeof(*fixup
), GFP_NOFS
);
2446 * We are already holding a reference to this inode from
2447 * write_cache_pages. We need to hold it because the space reservation
2448 * takes place outside of the page lock, and we can't trust
2449 * page->mapping outside of the page lock.
2452 SetPageChecked(page
);
2454 btrfs_init_work(&fixup
->work
, btrfs_writepage_fixup_worker
, NULL
, NULL
);
2456 fixup
->inode
= inode
;
2457 btrfs_queue_work(fs_info
->fixup_workers
, &fixup
->work
);
2462 static int insert_reserved_file_extent(struct btrfs_trans_handle
*trans
,
2463 struct btrfs_inode
*inode
, u64 file_pos
,
2464 struct btrfs_file_extent_item
*stack_fi
,
2465 u64 qgroup_reserved
)
2467 struct btrfs_root
*root
= inode
->root
;
2468 struct btrfs_path
*path
;
2469 struct extent_buffer
*leaf
;
2470 struct btrfs_key ins
;
2471 u64 disk_num_bytes
= btrfs_stack_file_extent_disk_num_bytes(stack_fi
);
2472 u64 disk_bytenr
= btrfs_stack_file_extent_disk_bytenr(stack_fi
);
2473 u64 num_bytes
= btrfs_stack_file_extent_num_bytes(stack_fi
);
2474 u64 ram_bytes
= btrfs_stack_file_extent_ram_bytes(stack_fi
);
2475 int extent_inserted
= 0;
2478 path
= btrfs_alloc_path();
2483 * we may be replacing one extent in the tree with another.
2484 * The new extent is pinned in the extent map, and we don't want
2485 * to drop it from the cache until it is completely in the btree.
2487 * So, tell btrfs_drop_extents to leave this extent in the cache.
2488 * the caller is expected to unpin it and allow it to be merged
2491 ret
= __btrfs_drop_extents(trans
, root
, inode
, path
, file_pos
,
2492 file_pos
+ num_bytes
, NULL
, 0,
2493 1, sizeof(*stack_fi
), &extent_inserted
);
2497 if (!extent_inserted
) {
2498 ins
.objectid
= btrfs_ino(inode
);
2499 ins
.offset
= file_pos
;
2500 ins
.type
= BTRFS_EXTENT_DATA_KEY
;
2502 path
->leave_spinning
= 1;
2503 ret
= btrfs_insert_empty_item(trans
, root
, path
, &ins
,
2508 leaf
= path
->nodes
[0];
2509 btrfs_set_stack_file_extent_generation(stack_fi
, trans
->transid
);
2510 write_extent_buffer(leaf
, stack_fi
,
2511 btrfs_item_ptr_offset(leaf
, path
->slots
[0]),
2512 sizeof(struct btrfs_file_extent_item
));
2514 btrfs_mark_buffer_dirty(leaf
);
2515 btrfs_release_path(path
);
2517 inode_add_bytes(&inode
->vfs_inode
, num_bytes
);
2519 ins
.objectid
= disk_bytenr
;
2520 ins
.offset
= disk_num_bytes
;
2521 ins
.type
= BTRFS_EXTENT_ITEM_KEY
;
2523 ret
= btrfs_inode_set_file_extent_range(inode
, file_pos
, ram_bytes
);
2527 ret
= btrfs_alloc_reserved_file_extent(trans
, root
, btrfs_ino(inode
),
2528 file_pos
, qgroup_reserved
, &ins
);
2530 btrfs_free_path(path
);
2535 static void btrfs_release_delalloc_bytes(struct btrfs_fs_info
*fs_info
,
2538 struct btrfs_block_group
*cache
;
2540 cache
= btrfs_lookup_block_group(fs_info
, start
);
2543 spin_lock(&cache
->lock
);
2544 cache
->delalloc_bytes
-= len
;
2545 spin_unlock(&cache
->lock
);
2547 btrfs_put_block_group(cache
);
2550 static int insert_ordered_extent_file_extent(struct btrfs_trans_handle
*trans
,
2551 struct inode
*inode
,
2552 struct btrfs_ordered_extent
*oe
)
2554 struct btrfs_file_extent_item stack_fi
;
2557 memset(&stack_fi
, 0, sizeof(stack_fi
));
2558 btrfs_set_stack_file_extent_type(&stack_fi
, BTRFS_FILE_EXTENT_REG
);
2559 btrfs_set_stack_file_extent_disk_bytenr(&stack_fi
, oe
->disk_bytenr
);
2560 btrfs_set_stack_file_extent_disk_num_bytes(&stack_fi
,
2561 oe
->disk_num_bytes
);
2562 if (test_bit(BTRFS_ORDERED_TRUNCATED
, &oe
->flags
))
2563 logical_len
= oe
->truncated_len
;
2565 logical_len
= oe
->num_bytes
;
2566 btrfs_set_stack_file_extent_num_bytes(&stack_fi
, logical_len
);
2567 btrfs_set_stack_file_extent_ram_bytes(&stack_fi
, logical_len
);
2568 btrfs_set_stack_file_extent_compression(&stack_fi
, oe
->compress_type
);
2569 /* Encryption and other encoding is reserved and all 0 */
2571 return insert_reserved_file_extent(trans
, BTRFS_I(inode
), oe
->file_offset
,
2572 &stack_fi
, oe
->qgroup_rsv
);
2576 * As ordered data IO finishes, this gets called so we can finish
2577 * an ordered extent if the range of bytes in the file it covers are
2580 static int btrfs_finish_ordered_io(struct btrfs_ordered_extent
*ordered_extent
)
2582 struct inode
*inode
= ordered_extent
->inode
;
2583 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
2584 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2585 struct btrfs_trans_handle
*trans
= NULL
;
2586 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2587 struct extent_state
*cached_state
= NULL
;
2589 int compress_type
= 0;
2591 u64 logical_len
= ordered_extent
->num_bytes
;
2592 bool freespace_inode
;
2593 bool truncated
= false;
2594 bool range_locked
= false;
2595 bool clear_new_delalloc_bytes
= false;
2596 bool clear_reserved_extent
= true;
2597 unsigned int clear_bits
;
2599 start
= ordered_extent
->file_offset
;
2600 end
= start
+ ordered_extent
->num_bytes
- 1;
2602 if (!test_bit(BTRFS_ORDERED_NOCOW
, &ordered_extent
->flags
) &&
2603 !test_bit(BTRFS_ORDERED_PREALLOC
, &ordered_extent
->flags
) &&
2604 !test_bit(BTRFS_ORDERED_DIRECT
, &ordered_extent
->flags
))
2605 clear_new_delalloc_bytes
= true;
2607 freespace_inode
= btrfs_is_free_space_inode(BTRFS_I(inode
));
2609 if (test_bit(BTRFS_ORDERED_IOERR
, &ordered_extent
->flags
)) {
2614 btrfs_free_io_failure_record(BTRFS_I(inode
), start
, end
);
2616 if (test_bit(BTRFS_ORDERED_TRUNCATED
, &ordered_extent
->flags
)) {
2618 logical_len
= ordered_extent
->truncated_len
;
2619 /* Truncated the entire extent, don't bother adding */
2624 if (test_bit(BTRFS_ORDERED_NOCOW
, &ordered_extent
->flags
)) {
2625 BUG_ON(!list_empty(&ordered_extent
->list
)); /* Logic error */
2627 btrfs_inode_safe_disk_i_size_write(inode
, 0);
2628 if (freespace_inode
)
2629 trans
= btrfs_join_transaction_spacecache(root
);
2631 trans
= btrfs_join_transaction(root
);
2632 if (IS_ERR(trans
)) {
2633 ret
= PTR_ERR(trans
);
2637 trans
->block_rsv
= &BTRFS_I(inode
)->block_rsv
;
2638 ret
= btrfs_update_inode_fallback(trans
, root
, inode
);
2639 if (ret
) /* -ENOMEM or corruption */
2640 btrfs_abort_transaction(trans
, ret
);
2644 range_locked
= true;
2645 lock_extent_bits(io_tree
, start
, end
, &cached_state
);
2647 if (freespace_inode
)
2648 trans
= btrfs_join_transaction_spacecache(root
);
2650 trans
= btrfs_join_transaction(root
);
2651 if (IS_ERR(trans
)) {
2652 ret
= PTR_ERR(trans
);
2657 trans
->block_rsv
= &BTRFS_I(inode
)->block_rsv
;
2659 if (test_bit(BTRFS_ORDERED_COMPRESSED
, &ordered_extent
->flags
))
2660 compress_type
= ordered_extent
->compress_type
;
2661 if (test_bit(BTRFS_ORDERED_PREALLOC
, &ordered_extent
->flags
)) {
2662 BUG_ON(compress_type
);
2663 ret
= btrfs_mark_extent_written(trans
, BTRFS_I(inode
),
2664 ordered_extent
->file_offset
,
2665 ordered_extent
->file_offset
+
2668 BUG_ON(root
== fs_info
->tree_root
);
2669 ret
= insert_ordered_extent_file_extent(trans
, inode
,
2672 clear_reserved_extent
= false;
2673 btrfs_release_delalloc_bytes(fs_info
,
2674 ordered_extent
->disk_bytenr
,
2675 ordered_extent
->disk_num_bytes
);
2678 unpin_extent_cache(&BTRFS_I(inode
)->extent_tree
,
2679 ordered_extent
->file_offset
,
2680 ordered_extent
->num_bytes
, trans
->transid
);
2682 btrfs_abort_transaction(trans
, ret
);
2686 ret
= add_pending_csums(trans
, inode
, &ordered_extent
->list
);
2688 btrfs_abort_transaction(trans
, ret
);
2692 btrfs_inode_safe_disk_i_size_write(inode
, 0);
2693 ret
= btrfs_update_inode_fallback(trans
, root
, inode
);
2694 if (ret
) { /* -ENOMEM or corruption */
2695 btrfs_abort_transaction(trans
, ret
);
2700 clear_bits
= EXTENT_DEFRAG
;
2702 clear_bits
|= EXTENT_LOCKED
;
2703 if (clear_new_delalloc_bytes
)
2704 clear_bits
|= EXTENT_DELALLOC_NEW
;
2705 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, start
, end
, clear_bits
,
2706 (clear_bits
& EXTENT_LOCKED
) ? 1 : 0, 0,
2710 btrfs_end_transaction(trans
);
2712 if (ret
|| truncated
) {
2713 u64 unwritten_start
= start
;
2716 unwritten_start
+= logical_len
;
2717 clear_extent_uptodate(io_tree
, unwritten_start
, end
, NULL
);
2719 /* Drop the cache for the part of the extent we didn't write. */
2720 btrfs_drop_extent_cache(BTRFS_I(inode
), unwritten_start
, end
, 0);
2723 * If the ordered extent had an IOERR or something else went
2724 * wrong we need to return the space for this ordered extent
2725 * back to the allocator. We only free the extent in the
2726 * truncated case if we didn't write out the extent at all.
2728 * If we made it past insert_reserved_file_extent before we
2729 * errored out then we don't need to do this as the accounting
2730 * has already been done.
2732 if ((ret
|| !logical_len
) &&
2733 clear_reserved_extent
&&
2734 !test_bit(BTRFS_ORDERED_NOCOW
, &ordered_extent
->flags
) &&
2735 !test_bit(BTRFS_ORDERED_PREALLOC
, &ordered_extent
->flags
)) {
2737 * Discard the range before returning it back to the
2740 if (ret
&& btrfs_test_opt(fs_info
, DISCARD_SYNC
))
2741 btrfs_discard_extent(fs_info
,
2742 ordered_extent
->disk_bytenr
,
2743 ordered_extent
->disk_num_bytes
,
2745 btrfs_free_reserved_extent(fs_info
,
2746 ordered_extent
->disk_bytenr
,
2747 ordered_extent
->disk_num_bytes
, 1);
2752 * This needs to be done to make sure anybody waiting knows we are done
2753 * updating everything for this ordered extent.
2755 btrfs_remove_ordered_extent(inode
, ordered_extent
);
2758 btrfs_put_ordered_extent(ordered_extent
);
2759 /* once for the tree */
2760 btrfs_put_ordered_extent(ordered_extent
);
2765 static void finish_ordered_fn(struct btrfs_work
*work
)
2767 struct btrfs_ordered_extent
*ordered_extent
;
2768 ordered_extent
= container_of(work
, struct btrfs_ordered_extent
, work
);
2769 btrfs_finish_ordered_io(ordered_extent
);
2772 void btrfs_writepage_endio_finish_ordered(struct page
*page
, u64 start
,
2773 u64 end
, int uptodate
)
2775 struct inode
*inode
= page
->mapping
->host
;
2776 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
2777 struct btrfs_ordered_extent
*ordered_extent
= NULL
;
2778 struct btrfs_workqueue
*wq
;
2780 trace_btrfs_writepage_end_io_hook(page
, start
, end
, uptodate
);
2782 ClearPagePrivate2(page
);
2783 if (!btrfs_dec_test_ordered_pending(inode
, &ordered_extent
, start
,
2784 end
- start
+ 1, uptodate
))
2787 if (btrfs_is_free_space_inode(BTRFS_I(inode
)))
2788 wq
= fs_info
->endio_freespace_worker
;
2790 wq
= fs_info
->endio_write_workers
;
2792 btrfs_init_work(&ordered_extent
->work
, finish_ordered_fn
, NULL
, NULL
);
2793 btrfs_queue_work(wq
, &ordered_extent
->work
);
2796 static int check_data_csum(struct inode
*inode
, struct btrfs_io_bio
*io_bio
,
2797 int icsum
, struct page
*page
, int pgoff
, u64 start
,
2800 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
2801 SHASH_DESC_ON_STACK(shash
, fs_info
->csum_shash
);
2803 u16 csum_size
= btrfs_super_csum_size(fs_info
->super_copy
);
2805 u8 csum
[BTRFS_CSUM_SIZE
];
2807 csum_expected
= ((u8
*)io_bio
->csum
) + icsum
* csum_size
;
2809 kaddr
= kmap_atomic(page
);
2810 shash
->tfm
= fs_info
->csum_shash
;
2812 crypto_shash_digest(shash
, kaddr
+ pgoff
, len
, csum
);
2814 if (memcmp(csum
, csum_expected
, csum_size
))
2817 kunmap_atomic(kaddr
);
2820 btrfs_print_data_csum_error(BTRFS_I(inode
), start
, csum
, csum_expected
,
2821 io_bio
->mirror_num
);
2823 btrfs_dev_stat_inc_and_print(io_bio
->device
,
2824 BTRFS_DEV_STAT_CORRUPTION_ERRS
);
2825 memset(kaddr
+ pgoff
, 1, len
);
2826 flush_dcache_page(page
);
2827 kunmap_atomic(kaddr
);
2832 * when reads are done, we need to check csums to verify the data is correct
2833 * if there's a match, we allow the bio to finish. If not, the code in
2834 * extent_io.c will try to find good copies for us.
2836 static int btrfs_readpage_end_io_hook(struct btrfs_io_bio
*io_bio
,
2837 u64 phy_offset
, struct page
*page
,
2838 u64 start
, u64 end
, int mirror
)
2840 size_t offset
= start
- page_offset(page
);
2841 struct inode
*inode
= page
->mapping
->host
;
2842 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2843 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2845 if (PageChecked(page
)) {
2846 ClearPageChecked(page
);
2850 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
)
2853 if (root
->root_key
.objectid
== BTRFS_DATA_RELOC_TREE_OBJECTID
&&
2854 test_range_bit(io_tree
, start
, end
, EXTENT_NODATASUM
, 1, NULL
)) {
2855 clear_extent_bits(io_tree
, start
, end
, EXTENT_NODATASUM
);
2859 phy_offset
>>= inode
->i_sb
->s_blocksize_bits
;
2860 return check_data_csum(inode
, io_bio
, phy_offset
, page
, offset
, start
,
2861 (size_t)(end
- start
+ 1));
2865 * btrfs_add_delayed_iput - perform a delayed iput on @inode
2867 * @inode: The inode we want to perform iput on
2869 * This function uses the generic vfs_inode::i_count to track whether we should
2870 * just decrement it (in case it's > 1) or if this is the last iput then link
2871 * the inode to the delayed iput machinery. Delayed iputs are processed at
2872 * transaction commit time/superblock commit/cleaner kthread.
2874 void btrfs_add_delayed_iput(struct inode
*inode
)
2876 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
2877 struct btrfs_inode
*binode
= BTRFS_I(inode
);
2879 if (atomic_add_unless(&inode
->i_count
, -1, 1))
2882 atomic_inc(&fs_info
->nr_delayed_iputs
);
2883 spin_lock(&fs_info
->delayed_iput_lock
);
2884 ASSERT(list_empty(&binode
->delayed_iput
));
2885 list_add_tail(&binode
->delayed_iput
, &fs_info
->delayed_iputs
);
2886 spin_unlock(&fs_info
->delayed_iput_lock
);
2887 if (!test_bit(BTRFS_FS_CLEANER_RUNNING
, &fs_info
->flags
))
2888 wake_up_process(fs_info
->cleaner_kthread
);
2891 static void run_delayed_iput_locked(struct btrfs_fs_info
*fs_info
,
2892 struct btrfs_inode
*inode
)
2894 list_del_init(&inode
->delayed_iput
);
2895 spin_unlock(&fs_info
->delayed_iput_lock
);
2896 iput(&inode
->vfs_inode
);
2897 if (atomic_dec_and_test(&fs_info
->nr_delayed_iputs
))
2898 wake_up(&fs_info
->delayed_iputs_wait
);
2899 spin_lock(&fs_info
->delayed_iput_lock
);
2902 static void btrfs_run_delayed_iput(struct btrfs_fs_info
*fs_info
,
2903 struct btrfs_inode
*inode
)
2905 if (!list_empty(&inode
->delayed_iput
)) {
2906 spin_lock(&fs_info
->delayed_iput_lock
);
2907 if (!list_empty(&inode
->delayed_iput
))
2908 run_delayed_iput_locked(fs_info
, inode
);
2909 spin_unlock(&fs_info
->delayed_iput_lock
);
2913 void btrfs_run_delayed_iputs(struct btrfs_fs_info
*fs_info
)
2916 spin_lock(&fs_info
->delayed_iput_lock
);
2917 while (!list_empty(&fs_info
->delayed_iputs
)) {
2918 struct btrfs_inode
*inode
;
2920 inode
= list_first_entry(&fs_info
->delayed_iputs
,
2921 struct btrfs_inode
, delayed_iput
);
2922 run_delayed_iput_locked(fs_info
, inode
);
2924 spin_unlock(&fs_info
->delayed_iput_lock
);
2928 * btrfs_wait_on_delayed_iputs - wait on the delayed iputs to be done running
2929 * @fs_info - the fs_info for this fs
2930 * @return - EINTR if we were killed, 0 if nothing's pending
2932 * This will wait on any delayed iputs that are currently running with KILLABLE
2933 * set. Once they are all done running we will return, unless we are killed in
2934 * which case we return EINTR. This helps in user operations like fallocate etc
2935 * that might get blocked on the iputs.
2937 int btrfs_wait_on_delayed_iputs(struct btrfs_fs_info
*fs_info
)
2939 int ret
= wait_event_killable(fs_info
->delayed_iputs_wait
,
2940 atomic_read(&fs_info
->nr_delayed_iputs
) == 0);
2947 * This creates an orphan entry for the given inode in case something goes wrong
2948 * in the middle of an unlink.
2950 int btrfs_orphan_add(struct btrfs_trans_handle
*trans
,
2951 struct btrfs_inode
*inode
)
2955 ret
= btrfs_insert_orphan_item(trans
, inode
->root
, btrfs_ino(inode
));
2956 if (ret
&& ret
!= -EEXIST
) {
2957 btrfs_abort_transaction(trans
, ret
);
2965 * We have done the delete so we can go ahead and remove the orphan item for
2966 * this particular inode.
2968 static int btrfs_orphan_del(struct btrfs_trans_handle
*trans
,
2969 struct btrfs_inode
*inode
)
2971 return btrfs_del_orphan_item(trans
, inode
->root
, btrfs_ino(inode
));
2975 * this cleans up any orphans that may be left on the list from the last use
2978 int btrfs_orphan_cleanup(struct btrfs_root
*root
)
2980 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2981 struct btrfs_path
*path
;
2982 struct extent_buffer
*leaf
;
2983 struct btrfs_key key
, found_key
;
2984 struct btrfs_trans_handle
*trans
;
2985 struct inode
*inode
;
2986 u64 last_objectid
= 0;
2987 int ret
= 0, nr_unlink
= 0;
2989 if (cmpxchg(&root
->orphan_cleanup_state
, 0, ORPHAN_CLEANUP_STARTED
))
2992 path
= btrfs_alloc_path();
2997 path
->reada
= READA_BACK
;
2999 key
.objectid
= BTRFS_ORPHAN_OBJECTID
;
3000 key
.type
= BTRFS_ORPHAN_ITEM_KEY
;
3001 key
.offset
= (u64
)-1;
3004 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
3009 * if ret == 0 means we found what we were searching for, which
3010 * is weird, but possible, so only screw with path if we didn't
3011 * find the key and see if we have stuff that matches
3015 if (path
->slots
[0] == 0)
3020 /* pull out the item */
3021 leaf
= path
->nodes
[0];
3022 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
3024 /* make sure the item matches what we want */
3025 if (found_key
.objectid
!= BTRFS_ORPHAN_OBJECTID
)
3027 if (found_key
.type
!= BTRFS_ORPHAN_ITEM_KEY
)
3030 /* release the path since we're done with it */
3031 btrfs_release_path(path
);
3034 * this is where we are basically btrfs_lookup, without the
3035 * crossing root thing. we store the inode number in the
3036 * offset of the orphan item.
3039 if (found_key
.offset
== last_objectid
) {
3041 "Error removing orphan entry, stopping orphan cleanup");
3046 last_objectid
= found_key
.offset
;
3048 found_key
.objectid
= found_key
.offset
;
3049 found_key
.type
= BTRFS_INODE_ITEM_KEY
;
3050 found_key
.offset
= 0;
3051 inode
= btrfs_iget(fs_info
->sb
, last_objectid
, root
);
3052 ret
= PTR_ERR_OR_ZERO(inode
);
3053 if (ret
&& ret
!= -ENOENT
)
3056 if (ret
== -ENOENT
&& root
== fs_info
->tree_root
) {
3057 struct btrfs_root
*dead_root
;
3058 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3059 int is_dead_root
= 0;
3062 * this is an orphan in the tree root. Currently these
3063 * could come from 2 sources:
3064 * a) a snapshot deletion in progress
3065 * b) a free space cache inode
3066 * We need to distinguish those two, as the snapshot
3067 * orphan must not get deleted.
3068 * find_dead_roots already ran before us, so if this
3069 * is a snapshot deletion, we should find the root
3070 * in the fs_roots radix tree.
3073 spin_lock(&fs_info
->fs_roots_radix_lock
);
3074 dead_root
= radix_tree_lookup(&fs_info
->fs_roots_radix
,
3075 (unsigned long)found_key
.objectid
);
3076 if (dead_root
&& btrfs_root_refs(&dead_root
->root_item
) == 0)
3078 spin_unlock(&fs_info
->fs_roots_radix_lock
);
3081 /* prevent this orphan from being found again */
3082 key
.offset
= found_key
.objectid
- 1;
3089 * If we have an inode with links, there are a couple of
3090 * possibilities. Old kernels (before v3.12) used to create an
3091 * orphan item for truncate indicating that there were possibly
3092 * extent items past i_size that needed to be deleted. In v3.12,
3093 * truncate was changed to update i_size in sync with the extent
3094 * items, but the (useless) orphan item was still created. Since
3095 * v4.18, we don't create the orphan item for truncate at all.
3097 * So, this item could mean that we need to do a truncate, but
3098 * only if this filesystem was last used on a pre-v3.12 kernel
3099 * and was not cleanly unmounted. The odds of that are quite
3100 * slim, and it's a pain to do the truncate now, so just delete
3103 * It's also possible that this orphan item was supposed to be
3104 * deleted but wasn't. The inode number may have been reused,
3105 * but either way, we can delete the orphan item.
3107 if (ret
== -ENOENT
|| inode
->i_nlink
) {
3110 trans
= btrfs_start_transaction(root
, 1);
3111 if (IS_ERR(trans
)) {
3112 ret
= PTR_ERR(trans
);
3115 btrfs_debug(fs_info
, "auto deleting %Lu",
3116 found_key
.objectid
);
3117 ret
= btrfs_del_orphan_item(trans
, root
,
3118 found_key
.objectid
);
3119 btrfs_end_transaction(trans
);
3127 /* this will do delete_inode and everything for us */
3130 /* release the path since we're done with it */
3131 btrfs_release_path(path
);
3133 root
->orphan_cleanup_state
= ORPHAN_CLEANUP_DONE
;
3135 if (test_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &root
->state
)) {
3136 trans
= btrfs_join_transaction(root
);
3138 btrfs_end_transaction(trans
);
3142 btrfs_debug(fs_info
, "unlinked %d orphans", nr_unlink
);
3146 btrfs_err(fs_info
, "could not do orphan cleanup %d", ret
);
3147 btrfs_free_path(path
);
3152 * very simple check to peek ahead in the leaf looking for xattrs. If we
3153 * don't find any xattrs, we know there can't be any acls.
3155 * slot is the slot the inode is in, objectid is the objectid of the inode
3157 static noinline
int acls_after_inode_item(struct extent_buffer
*leaf
,
3158 int slot
, u64 objectid
,
3159 int *first_xattr_slot
)
3161 u32 nritems
= btrfs_header_nritems(leaf
);
3162 struct btrfs_key found_key
;
3163 static u64 xattr_access
= 0;
3164 static u64 xattr_default
= 0;
3167 if (!xattr_access
) {
3168 xattr_access
= btrfs_name_hash(XATTR_NAME_POSIX_ACL_ACCESS
,
3169 strlen(XATTR_NAME_POSIX_ACL_ACCESS
));
3170 xattr_default
= btrfs_name_hash(XATTR_NAME_POSIX_ACL_DEFAULT
,
3171 strlen(XATTR_NAME_POSIX_ACL_DEFAULT
));
3175 *first_xattr_slot
= -1;
3176 while (slot
< nritems
) {
3177 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
3179 /* we found a different objectid, there must not be acls */
3180 if (found_key
.objectid
!= objectid
)
3183 /* we found an xattr, assume we've got an acl */
3184 if (found_key
.type
== BTRFS_XATTR_ITEM_KEY
) {
3185 if (*first_xattr_slot
== -1)
3186 *first_xattr_slot
= slot
;
3187 if (found_key
.offset
== xattr_access
||
3188 found_key
.offset
== xattr_default
)
3193 * we found a key greater than an xattr key, there can't
3194 * be any acls later on
3196 if (found_key
.type
> BTRFS_XATTR_ITEM_KEY
)
3203 * it goes inode, inode backrefs, xattrs, extents,
3204 * so if there are a ton of hard links to an inode there can
3205 * be a lot of backrefs. Don't waste time searching too hard,
3206 * this is just an optimization
3211 /* we hit the end of the leaf before we found an xattr or
3212 * something larger than an xattr. We have to assume the inode
3215 if (*first_xattr_slot
== -1)
3216 *first_xattr_slot
= slot
;
3221 * read an inode from the btree into the in-memory inode
3223 static int btrfs_read_locked_inode(struct inode
*inode
,
3224 struct btrfs_path
*in_path
)
3226 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
3227 struct btrfs_path
*path
= in_path
;
3228 struct extent_buffer
*leaf
;
3229 struct btrfs_inode_item
*inode_item
;
3230 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
3231 struct btrfs_key location
;
3236 bool filled
= false;
3237 int first_xattr_slot
;
3239 ret
= btrfs_fill_inode(inode
, &rdev
);
3244 path
= btrfs_alloc_path();
3249 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
3251 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
3253 if (path
!= in_path
)
3254 btrfs_free_path(path
);
3258 leaf
= path
->nodes
[0];
3263 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
3264 struct btrfs_inode_item
);
3265 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
3266 set_nlink(inode
, btrfs_inode_nlink(leaf
, inode_item
));
3267 i_uid_write(inode
, btrfs_inode_uid(leaf
, inode_item
));
3268 i_gid_write(inode
, btrfs_inode_gid(leaf
, inode_item
));
3269 btrfs_i_size_write(BTRFS_I(inode
), btrfs_inode_size(leaf
, inode_item
));
3270 btrfs_inode_set_file_extent_range(BTRFS_I(inode
), 0,
3271 round_up(i_size_read(inode
), fs_info
->sectorsize
));
3273 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, &inode_item
->atime
);
3274 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, &inode_item
->atime
);
3276 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, &inode_item
->mtime
);
3277 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, &inode_item
->mtime
);
3279 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, &inode_item
->ctime
);
3280 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, &inode_item
->ctime
);
3282 BTRFS_I(inode
)->i_otime
.tv_sec
=
3283 btrfs_timespec_sec(leaf
, &inode_item
->otime
);
3284 BTRFS_I(inode
)->i_otime
.tv_nsec
=
3285 btrfs_timespec_nsec(leaf
, &inode_item
->otime
);
3287 inode_set_bytes(inode
, btrfs_inode_nbytes(leaf
, inode_item
));
3288 BTRFS_I(inode
)->generation
= btrfs_inode_generation(leaf
, inode_item
);
3289 BTRFS_I(inode
)->last_trans
= btrfs_inode_transid(leaf
, inode_item
);
3291 inode_set_iversion_queried(inode
,
3292 btrfs_inode_sequence(leaf
, inode_item
));
3293 inode
->i_generation
= BTRFS_I(inode
)->generation
;
3295 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
3297 BTRFS_I(inode
)->index_cnt
= (u64
)-1;
3298 BTRFS_I(inode
)->flags
= btrfs_inode_flags(leaf
, inode_item
);
3302 * If we were modified in the current generation and evicted from memory
3303 * and then re-read we need to do a full sync since we don't have any
3304 * idea about which extents were modified before we were evicted from
3307 * This is required for both inode re-read from disk and delayed inode
3308 * in delayed_nodes_tree.
3310 if (BTRFS_I(inode
)->last_trans
== fs_info
->generation
)
3311 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
3312 &BTRFS_I(inode
)->runtime_flags
);
3315 * We don't persist the id of the transaction where an unlink operation
3316 * against the inode was last made. So here we assume the inode might
3317 * have been evicted, and therefore the exact value of last_unlink_trans
3318 * lost, and set it to last_trans to avoid metadata inconsistencies
3319 * between the inode and its parent if the inode is fsync'ed and the log
3320 * replayed. For example, in the scenario:
3323 * ln mydir/foo mydir/bar
3326 * echo 2 > /proc/sys/vm/drop_caches # evicts inode
3327 * xfs_io -c fsync mydir/foo
3329 * mount fs, triggers fsync log replay
3331 * We must make sure that when we fsync our inode foo we also log its
3332 * parent inode, otherwise after log replay the parent still has the
3333 * dentry with the "bar" name but our inode foo has a link count of 1
3334 * and doesn't have an inode ref with the name "bar" anymore.
3336 * Setting last_unlink_trans to last_trans is a pessimistic approach,
3337 * but it guarantees correctness at the expense of occasional full
3338 * transaction commits on fsync if our inode is a directory, or if our
3339 * inode is not a directory, logging its parent unnecessarily.
3341 BTRFS_I(inode
)->last_unlink_trans
= BTRFS_I(inode
)->last_trans
;
3344 * Same logic as for last_unlink_trans. We don't persist the generation
3345 * of the last transaction where this inode was used for a reflink
3346 * operation, so after eviction and reloading the inode we must be
3347 * pessimistic and assume the last transaction that modified the inode.
3349 BTRFS_I(inode
)->last_reflink_trans
= BTRFS_I(inode
)->last_trans
;
3352 if (inode
->i_nlink
!= 1 ||
3353 path
->slots
[0] >= btrfs_header_nritems(leaf
))
3356 btrfs_item_key_to_cpu(leaf
, &location
, path
->slots
[0]);
3357 if (location
.objectid
!= btrfs_ino(BTRFS_I(inode
)))
3360 ptr
= btrfs_item_ptr_offset(leaf
, path
->slots
[0]);
3361 if (location
.type
== BTRFS_INODE_REF_KEY
) {
3362 struct btrfs_inode_ref
*ref
;
3364 ref
= (struct btrfs_inode_ref
*)ptr
;
3365 BTRFS_I(inode
)->dir_index
= btrfs_inode_ref_index(leaf
, ref
);
3366 } else if (location
.type
== BTRFS_INODE_EXTREF_KEY
) {
3367 struct btrfs_inode_extref
*extref
;
3369 extref
= (struct btrfs_inode_extref
*)ptr
;
3370 BTRFS_I(inode
)->dir_index
= btrfs_inode_extref_index(leaf
,
3375 * try to precache a NULL acl entry for files that don't have
3376 * any xattrs or acls
3378 maybe_acls
= acls_after_inode_item(leaf
, path
->slots
[0],
3379 btrfs_ino(BTRFS_I(inode
)), &first_xattr_slot
);
3380 if (first_xattr_slot
!= -1) {
3381 path
->slots
[0] = first_xattr_slot
;
3382 ret
= btrfs_load_inode_props(inode
, path
);
3385 "error loading props for ino %llu (root %llu): %d",
3386 btrfs_ino(BTRFS_I(inode
)),
3387 root
->root_key
.objectid
, ret
);
3389 if (path
!= in_path
)
3390 btrfs_free_path(path
);
3393 cache_no_acl(inode
);
3395 switch (inode
->i_mode
& S_IFMT
) {
3397 inode
->i_mapping
->a_ops
= &btrfs_aops
;
3398 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
3399 inode
->i_fop
= &btrfs_file_operations
;
3400 inode
->i_op
= &btrfs_file_inode_operations
;
3403 inode
->i_fop
= &btrfs_dir_file_operations
;
3404 inode
->i_op
= &btrfs_dir_inode_operations
;
3407 inode
->i_op
= &btrfs_symlink_inode_operations
;
3408 inode_nohighmem(inode
);
3409 inode
->i_mapping
->a_ops
= &btrfs_aops
;
3412 inode
->i_op
= &btrfs_special_inode_operations
;
3413 init_special_inode(inode
, inode
->i_mode
, rdev
);
3417 btrfs_sync_inode_flags_to_i_flags(inode
);
3422 * given a leaf and an inode, copy the inode fields into the leaf
3424 static void fill_inode_item(struct btrfs_trans_handle
*trans
,
3425 struct extent_buffer
*leaf
,
3426 struct btrfs_inode_item
*item
,
3427 struct inode
*inode
)
3429 struct btrfs_map_token token
;
3431 btrfs_init_map_token(&token
, leaf
);
3433 btrfs_set_token_inode_uid(&token
, item
, i_uid_read(inode
));
3434 btrfs_set_token_inode_gid(&token
, item
, i_gid_read(inode
));
3435 btrfs_set_token_inode_size(&token
, item
, BTRFS_I(inode
)->disk_i_size
);
3436 btrfs_set_token_inode_mode(&token
, item
, inode
->i_mode
);
3437 btrfs_set_token_inode_nlink(&token
, item
, inode
->i_nlink
);
3439 btrfs_set_token_timespec_sec(&token
, &item
->atime
,
3440 inode
->i_atime
.tv_sec
);
3441 btrfs_set_token_timespec_nsec(&token
, &item
->atime
,
3442 inode
->i_atime
.tv_nsec
);
3444 btrfs_set_token_timespec_sec(&token
, &item
->mtime
,
3445 inode
->i_mtime
.tv_sec
);
3446 btrfs_set_token_timespec_nsec(&token
, &item
->mtime
,
3447 inode
->i_mtime
.tv_nsec
);
3449 btrfs_set_token_timespec_sec(&token
, &item
->ctime
,
3450 inode
->i_ctime
.tv_sec
);
3451 btrfs_set_token_timespec_nsec(&token
, &item
->ctime
,
3452 inode
->i_ctime
.tv_nsec
);
3454 btrfs_set_token_timespec_sec(&token
, &item
->otime
,
3455 BTRFS_I(inode
)->i_otime
.tv_sec
);
3456 btrfs_set_token_timespec_nsec(&token
, &item
->otime
,
3457 BTRFS_I(inode
)->i_otime
.tv_nsec
);
3459 btrfs_set_token_inode_nbytes(&token
, item
, inode_get_bytes(inode
));
3460 btrfs_set_token_inode_generation(&token
, item
,
3461 BTRFS_I(inode
)->generation
);
3462 btrfs_set_token_inode_sequence(&token
, item
, inode_peek_iversion(inode
));
3463 btrfs_set_token_inode_transid(&token
, item
, trans
->transid
);
3464 btrfs_set_token_inode_rdev(&token
, item
, inode
->i_rdev
);
3465 btrfs_set_token_inode_flags(&token
, item
, BTRFS_I(inode
)->flags
);
3466 btrfs_set_token_inode_block_group(&token
, item
, 0);
3470 * copy everything in the in-memory inode into the btree.
3472 static noinline
int btrfs_update_inode_item(struct btrfs_trans_handle
*trans
,
3473 struct btrfs_root
*root
, struct inode
*inode
)
3475 struct btrfs_inode_item
*inode_item
;
3476 struct btrfs_path
*path
;
3477 struct extent_buffer
*leaf
;
3480 path
= btrfs_alloc_path();
3484 path
->leave_spinning
= 1;
3485 ret
= btrfs_lookup_inode(trans
, root
, path
, &BTRFS_I(inode
)->location
,
3493 leaf
= path
->nodes
[0];
3494 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
3495 struct btrfs_inode_item
);
3497 fill_inode_item(trans
, leaf
, inode_item
, inode
);
3498 btrfs_mark_buffer_dirty(leaf
);
3499 btrfs_set_inode_last_trans(trans
, BTRFS_I(inode
));
3502 btrfs_free_path(path
);
3507 * copy everything in the in-memory inode into the btree.
3509 noinline
int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
3510 struct btrfs_root
*root
, struct inode
*inode
)
3512 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3516 * If the inode is a free space inode, we can deadlock during commit
3517 * if we put it into the delayed code.
3519 * The data relocation inode should also be directly updated
3522 if (!btrfs_is_free_space_inode(BTRFS_I(inode
))
3523 && root
->root_key
.objectid
!= BTRFS_DATA_RELOC_TREE_OBJECTID
3524 && !test_bit(BTRFS_FS_LOG_RECOVERING
, &fs_info
->flags
)) {
3525 btrfs_update_root_times(trans
, root
);
3527 ret
= btrfs_delayed_update_inode(trans
, root
, inode
);
3529 btrfs_set_inode_last_trans(trans
, BTRFS_I(inode
));
3533 return btrfs_update_inode_item(trans
, root
, inode
);
3536 noinline
int btrfs_update_inode_fallback(struct btrfs_trans_handle
*trans
,
3537 struct btrfs_root
*root
,
3538 struct inode
*inode
)
3542 ret
= btrfs_update_inode(trans
, root
, inode
);
3544 return btrfs_update_inode_item(trans
, root
, inode
);
3549 * unlink helper that gets used here in inode.c and in the tree logging
3550 * recovery code. It remove a link in a directory with a given name, and
3551 * also drops the back refs in the inode to the directory
3553 static int __btrfs_unlink_inode(struct btrfs_trans_handle
*trans
,
3554 struct btrfs_root
*root
,
3555 struct btrfs_inode
*dir
,
3556 struct btrfs_inode
*inode
,
3557 const char *name
, int name_len
)
3559 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3560 struct btrfs_path
*path
;
3562 struct btrfs_dir_item
*di
;
3564 u64 ino
= btrfs_ino(inode
);
3565 u64 dir_ino
= btrfs_ino(dir
);
3567 path
= btrfs_alloc_path();
3573 path
->leave_spinning
= 1;
3574 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir_ino
,
3575 name
, name_len
, -1);
3576 if (IS_ERR_OR_NULL(di
)) {
3577 ret
= di
? PTR_ERR(di
) : -ENOENT
;
3580 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
3583 btrfs_release_path(path
);
3586 * If we don't have dir index, we have to get it by looking up
3587 * the inode ref, since we get the inode ref, remove it directly,
3588 * it is unnecessary to do delayed deletion.
3590 * But if we have dir index, needn't search inode ref to get it.
3591 * Since the inode ref is close to the inode item, it is better
3592 * that we delay to delete it, and just do this deletion when
3593 * we update the inode item.
3595 if (inode
->dir_index
) {
3596 ret
= btrfs_delayed_delete_inode_ref(inode
);
3598 index
= inode
->dir_index
;
3603 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
, ino
,
3607 "failed to delete reference to %.*s, inode %llu parent %llu",
3608 name_len
, name
, ino
, dir_ino
);
3609 btrfs_abort_transaction(trans
, ret
);
3613 ret
= btrfs_delete_delayed_dir_index(trans
, dir
, index
);
3615 btrfs_abort_transaction(trans
, ret
);
3619 ret
= btrfs_del_inode_ref_in_log(trans
, root
, name
, name_len
, inode
,
3621 if (ret
!= 0 && ret
!= -ENOENT
) {
3622 btrfs_abort_transaction(trans
, ret
);
3626 ret
= btrfs_del_dir_entries_in_log(trans
, root
, name
, name_len
, dir
,
3631 btrfs_abort_transaction(trans
, ret
);
3634 * If we have a pending delayed iput we could end up with the final iput
3635 * being run in btrfs-cleaner context. If we have enough of these built
3636 * up we can end up burning a lot of time in btrfs-cleaner without any
3637 * way to throttle the unlinks. Since we're currently holding a ref on
3638 * the inode we can run the delayed iput here without any issues as the
3639 * final iput won't be done until after we drop the ref we're currently
3642 btrfs_run_delayed_iput(fs_info
, inode
);
3644 btrfs_free_path(path
);
3648 btrfs_i_size_write(dir
, dir
->vfs_inode
.i_size
- name_len
* 2);
3649 inode_inc_iversion(&inode
->vfs_inode
);
3650 inode_inc_iversion(&dir
->vfs_inode
);
3651 inode
->vfs_inode
.i_ctime
= dir
->vfs_inode
.i_mtime
=
3652 dir
->vfs_inode
.i_ctime
= current_time(&inode
->vfs_inode
);
3653 ret
= btrfs_update_inode(trans
, root
, &dir
->vfs_inode
);
3658 int btrfs_unlink_inode(struct btrfs_trans_handle
*trans
,
3659 struct btrfs_root
*root
,
3660 struct btrfs_inode
*dir
, struct btrfs_inode
*inode
,
3661 const char *name
, int name_len
)
3664 ret
= __btrfs_unlink_inode(trans
, root
, dir
, inode
, name
, name_len
);
3666 drop_nlink(&inode
->vfs_inode
);
3667 ret
= btrfs_update_inode(trans
, root
, &inode
->vfs_inode
);
3673 * helper to start transaction for unlink and rmdir.
3675 * unlink and rmdir are special in btrfs, they do not always free space, so
3676 * if we cannot make our reservations the normal way try and see if there is
3677 * plenty of slack room in the global reserve to migrate, otherwise we cannot
3678 * allow the unlink to occur.
3680 static struct btrfs_trans_handle
*__unlink_start_trans(struct inode
*dir
)
3682 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3685 * 1 for the possible orphan item
3686 * 1 for the dir item
3687 * 1 for the dir index
3688 * 1 for the inode ref
3691 return btrfs_start_transaction_fallback_global_rsv(root
, 5);
3694 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
3696 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3697 struct btrfs_trans_handle
*trans
;
3698 struct inode
*inode
= d_inode(dentry
);
3701 trans
= __unlink_start_trans(dir
);
3703 return PTR_ERR(trans
);
3705 btrfs_record_unlink_dir(trans
, BTRFS_I(dir
), BTRFS_I(d_inode(dentry
)),
3708 ret
= btrfs_unlink_inode(trans
, root
, BTRFS_I(dir
),
3709 BTRFS_I(d_inode(dentry
)), dentry
->d_name
.name
,
3710 dentry
->d_name
.len
);
3714 if (inode
->i_nlink
== 0) {
3715 ret
= btrfs_orphan_add(trans
, BTRFS_I(inode
));
3721 btrfs_end_transaction(trans
);
3722 btrfs_btree_balance_dirty(root
->fs_info
);
3726 static int btrfs_unlink_subvol(struct btrfs_trans_handle
*trans
,
3727 struct inode
*dir
, struct dentry
*dentry
)
3729 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3730 struct btrfs_inode
*inode
= BTRFS_I(d_inode(dentry
));
3731 struct btrfs_path
*path
;
3732 struct extent_buffer
*leaf
;
3733 struct btrfs_dir_item
*di
;
3734 struct btrfs_key key
;
3735 const char *name
= dentry
->d_name
.name
;
3736 int name_len
= dentry
->d_name
.len
;
3740 u64 dir_ino
= btrfs_ino(BTRFS_I(dir
));
3742 if (btrfs_ino(inode
) == BTRFS_FIRST_FREE_OBJECTID
) {
3743 objectid
= inode
->root
->root_key
.objectid
;
3744 } else if (btrfs_ino(inode
) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
) {
3745 objectid
= inode
->location
.objectid
;
3751 path
= btrfs_alloc_path();
3755 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir_ino
,
3756 name
, name_len
, -1);
3757 if (IS_ERR_OR_NULL(di
)) {
3758 ret
= di
? PTR_ERR(di
) : -ENOENT
;
3762 leaf
= path
->nodes
[0];
3763 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
3764 WARN_ON(key
.type
!= BTRFS_ROOT_ITEM_KEY
|| key
.objectid
!= objectid
);
3765 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
3767 btrfs_abort_transaction(trans
, ret
);
3770 btrfs_release_path(path
);
3773 * This is a placeholder inode for a subvolume we didn't have a
3774 * reference to at the time of the snapshot creation. In the meantime
3775 * we could have renamed the real subvol link into our snapshot, so
3776 * depending on btrfs_del_root_ref to return -ENOENT here is incorret.
3777 * Instead simply lookup the dir_index_item for this entry so we can
3778 * remove it. Otherwise we know we have a ref to the root and we can
3779 * call btrfs_del_root_ref, and it _shouldn't_ fail.
3781 if (btrfs_ino(inode
) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
) {
3782 di
= btrfs_search_dir_index_item(root
, path
, dir_ino
,
3784 if (IS_ERR_OR_NULL(di
)) {
3789 btrfs_abort_transaction(trans
, ret
);
3793 leaf
= path
->nodes
[0];
3794 btrfs_item_key_to_cpu(leaf
, &key
, path
->slots
[0]);
3796 btrfs_release_path(path
);
3798 ret
= btrfs_del_root_ref(trans
, objectid
,
3799 root
->root_key
.objectid
, dir_ino
,
3800 &index
, name
, name_len
);
3802 btrfs_abort_transaction(trans
, ret
);
3807 ret
= btrfs_delete_delayed_dir_index(trans
, BTRFS_I(dir
), index
);
3809 btrfs_abort_transaction(trans
, ret
);
3813 btrfs_i_size_write(BTRFS_I(dir
), dir
->i_size
- name_len
* 2);
3814 inode_inc_iversion(dir
);
3815 dir
->i_mtime
= dir
->i_ctime
= current_time(dir
);
3816 ret
= btrfs_update_inode_fallback(trans
, root
, dir
);
3818 btrfs_abort_transaction(trans
, ret
);
3820 btrfs_free_path(path
);
3825 * Helper to check if the subvolume references other subvolumes or if it's
3828 static noinline
int may_destroy_subvol(struct btrfs_root
*root
)
3830 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3831 struct btrfs_path
*path
;
3832 struct btrfs_dir_item
*di
;
3833 struct btrfs_key key
;
3837 path
= btrfs_alloc_path();
3841 /* Make sure this root isn't set as the default subvol */
3842 dir_id
= btrfs_super_root_dir(fs_info
->super_copy
);
3843 di
= btrfs_lookup_dir_item(NULL
, fs_info
->tree_root
, path
,
3844 dir_id
, "default", 7, 0);
3845 if (di
&& !IS_ERR(di
)) {
3846 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &key
);
3847 if (key
.objectid
== root
->root_key
.objectid
) {
3850 "deleting default subvolume %llu is not allowed",
3854 btrfs_release_path(path
);
3857 key
.objectid
= root
->root_key
.objectid
;
3858 key
.type
= BTRFS_ROOT_REF_KEY
;
3859 key
.offset
= (u64
)-1;
3861 ret
= btrfs_search_slot(NULL
, fs_info
->tree_root
, &key
, path
, 0, 0);
3867 if (path
->slots
[0] > 0) {
3869 btrfs_item_key_to_cpu(path
->nodes
[0], &key
, path
->slots
[0]);
3870 if (key
.objectid
== root
->root_key
.objectid
&&
3871 key
.type
== BTRFS_ROOT_REF_KEY
)
3875 btrfs_free_path(path
);
3879 /* Delete all dentries for inodes belonging to the root */
3880 static void btrfs_prune_dentries(struct btrfs_root
*root
)
3882 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
3883 struct rb_node
*node
;
3884 struct rb_node
*prev
;
3885 struct btrfs_inode
*entry
;
3886 struct inode
*inode
;
3889 if (!test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
))
3890 WARN_ON(btrfs_root_refs(&root
->root_item
) != 0);
3892 spin_lock(&root
->inode_lock
);
3894 node
= root
->inode_tree
.rb_node
;
3898 entry
= rb_entry(node
, struct btrfs_inode
, rb_node
);
3900 if (objectid
< btrfs_ino(entry
))
3901 node
= node
->rb_left
;
3902 else if (objectid
> btrfs_ino(entry
))
3903 node
= node
->rb_right
;
3909 entry
= rb_entry(prev
, struct btrfs_inode
, rb_node
);
3910 if (objectid
<= btrfs_ino(entry
)) {
3914 prev
= rb_next(prev
);
3918 entry
= rb_entry(node
, struct btrfs_inode
, rb_node
);
3919 objectid
= btrfs_ino(entry
) + 1;
3920 inode
= igrab(&entry
->vfs_inode
);
3922 spin_unlock(&root
->inode_lock
);
3923 if (atomic_read(&inode
->i_count
) > 1)
3924 d_prune_aliases(inode
);
3926 * btrfs_drop_inode will have it removed from the inode
3927 * cache when its usage count hits zero.
3931 spin_lock(&root
->inode_lock
);
3935 if (cond_resched_lock(&root
->inode_lock
))
3938 node
= rb_next(node
);
3940 spin_unlock(&root
->inode_lock
);
3943 int btrfs_delete_subvolume(struct inode
*dir
, struct dentry
*dentry
)
3945 struct btrfs_fs_info
*fs_info
= btrfs_sb(dentry
->d_sb
);
3946 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
3947 struct inode
*inode
= d_inode(dentry
);
3948 struct btrfs_root
*dest
= BTRFS_I(inode
)->root
;
3949 struct btrfs_trans_handle
*trans
;
3950 struct btrfs_block_rsv block_rsv
;
3956 * Don't allow to delete a subvolume with send in progress. This is
3957 * inside the inode lock so the error handling that has to drop the bit
3958 * again is not run concurrently.
3960 spin_lock(&dest
->root_item_lock
);
3961 if (dest
->send_in_progress
) {
3962 spin_unlock(&dest
->root_item_lock
);
3964 "attempt to delete subvolume %llu during send",
3965 dest
->root_key
.objectid
);
3968 root_flags
= btrfs_root_flags(&dest
->root_item
);
3969 btrfs_set_root_flags(&dest
->root_item
,
3970 root_flags
| BTRFS_ROOT_SUBVOL_DEAD
);
3971 spin_unlock(&dest
->root_item_lock
);
3973 down_write(&fs_info
->subvol_sem
);
3975 err
= may_destroy_subvol(dest
);
3979 btrfs_init_block_rsv(&block_rsv
, BTRFS_BLOCK_RSV_TEMP
);
3981 * One for dir inode,
3982 * two for dir entries,
3983 * two for root ref/backref.
3985 err
= btrfs_subvolume_reserve_metadata(root
, &block_rsv
, 5, true);
3989 trans
= btrfs_start_transaction(root
, 0);
3990 if (IS_ERR(trans
)) {
3991 err
= PTR_ERR(trans
);
3994 trans
->block_rsv
= &block_rsv
;
3995 trans
->bytes_reserved
= block_rsv
.size
;
3997 btrfs_record_snapshot_destroy(trans
, BTRFS_I(dir
));
3999 ret
= btrfs_unlink_subvol(trans
, dir
, dentry
);
4002 btrfs_abort_transaction(trans
, ret
);
4006 btrfs_record_root_in_trans(trans
, dest
);
4008 memset(&dest
->root_item
.drop_progress
, 0,
4009 sizeof(dest
->root_item
.drop_progress
));
4010 dest
->root_item
.drop_level
= 0;
4011 btrfs_set_root_refs(&dest
->root_item
, 0);
4013 if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED
, &dest
->state
)) {
4014 ret
= btrfs_insert_orphan_item(trans
,
4016 dest
->root_key
.objectid
);
4018 btrfs_abort_transaction(trans
, ret
);
4024 ret
= btrfs_uuid_tree_remove(trans
, dest
->root_item
.uuid
,
4025 BTRFS_UUID_KEY_SUBVOL
,
4026 dest
->root_key
.objectid
);
4027 if (ret
&& ret
!= -ENOENT
) {
4028 btrfs_abort_transaction(trans
, ret
);
4032 if (!btrfs_is_empty_uuid(dest
->root_item
.received_uuid
)) {
4033 ret
= btrfs_uuid_tree_remove(trans
,
4034 dest
->root_item
.received_uuid
,
4035 BTRFS_UUID_KEY_RECEIVED_SUBVOL
,
4036 dest
->root_key
.objectid
);
4037 if (ret
&& ret
!= -ENOENT
) {
4038 btrfs_abort_transaction(trans
, ret
);
4044 free_anon_bdev(dest
->anon_dev
);
4047 trans
->block_rsv
= NULL
;
4048 trans
->bytes_reserved
= 0;
4049 ret
= btrfs_end_transaction(trans
);
4052 inode
->i_flags
|= S_DEAD
;
4054 btrfs_subvolume_release_metadata(fs_info
, &block_rsv
);
4056 up_write(&fs_info
->subvol_sem
);
4058 spin_lock(&dest
->root_item_lock
);
4059 root_flags
= btrfs_root_flags(&dest
->root_item
);
4060 btrfs_set_root_flags(&dest
->root_item
,
4061 root_flags
& ~BTRFS_ROOT_SUBVOL_DEAD
);
4062 spin_unlock(&dest
->root_item_lock
);
4064 d_invalidate(dentry
);
4065 btrfs_prune_dentries(dest
);
4066 ASSERT(dest
->send_in_progress
== 0);
4069 if (dest
->ino_cache_inode
) {
4070 iput(dest
->ino_cache_inode
);
4071 dest
->ino_cache_inode
= NULL
;
4078 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
4080 struct inode
*inode
= d_inode(dentry
);
4082 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
4083 struct btrfs_trans_handle
*trans
;
4084 u64 last_unlink_trans
;
4086 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
4088 if (btrfs_ino(BTRFS_I(inode
)) == BTRFS_FIRST_FREE_OBJECTID
)
4089 return btrfs_delete_subvolume(dir
, dentry
);
4091 trans
= __unlink_start_trans(dir
);
4093 return PTR_ERR(trans
);
4095 if (unlikely(btrfs_ino(BTRFS_I(inode
)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)) {
4096 err
= btrfs_unlink_subvol(trans
, dir
, dentry
);
4100 err
= btrfs_orphan_add(trans
, BTRFS_I(inode
));
4104 last_unlink_trans
= BTRFS_I(inode
)->last_unlink_trans
;
4106 /* now the directory is empty */
4107 err
= btrfs_unlink_inode(trans
, root
, BTRFS_I(dir
),
4108 BTRFS_I(d_inode(dentry
)), dentry
->d_name
.name
,
4109 dentry
->d_name
.len
);
4111 btrfs_i_size_write(BTRFS_I(inode
), 0);
4113 * Propagate the last_unlink_trans value of the deleted dir to
4114 * its parent directory. This is to prevent an unrecoverable
4115 * log tree in the case we do something like this:
4117 * 2) create snapshot under dir foo
4118 * 3) delete the snapshot
4121 * 6) fsync foo or some file inside foo
4123 if (last_unlink_trans
>= trans
->transid
)
4124 BTRFS_I(dir
)->last_unlink_trans
= last_unlink_trans
;
4127 btrfs_end_transaction(trans
);
4128 btrfs_btree_balance_dirty(root
->fs_info
);
4134 * Return this if we need to call truncate_block for the last bit of the
4137 #define NEED_TRUNCATE_BLOCK 1
4140 * this can truncate away extent items, csum items and directory items.
4141 * It starts at a high offset and removes keys until it can't find
4142 * any higher than new_size
4144 * csum items that cross the new i_size are truncated to the new size
4147 * min_type is the minimum key type to truncate down to. If set to 0, this
4148 * will kill all the items on this inode, including the INODE_ITEM_KEY.
4150 int btrfs_truncate_inode_items(struct btrfs_trans_handle
*trans
,
4151 struct btrfs_root
*root
,
4152 struct inode
*inode
,
4153 u64 new_size
, u32 min_type
)
4155 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
4156 struct btrfs_path
*path
;
4157 struct extent_buffer
*leaf
;
4158 struct btrfs_file_extent_item
*fi
;
4159 struct btrfs_key key
;
4160 struct btrfs_key found_key
;
4161 u64 extent_start
= 0;
4162 u64 extent_num_bytes
= 0;
4163 u64 extent_offset
= 0;
4165 u64 last_size
= new_size
;
4166 u32 found_type
= (u8
)-1;
4169 int pending_del_nr
= 0;
4170 int pending_del_slot
= 0;
4171 int extent_type
= -1;
4173 u64 ino
= btrfs_ino(BTRFS_I(inode
));
4174 u64 bytes_deleted
= 0;
4175 bool be_nice
= false;
4176 bool should_throttle
= false;
4177 const u64 lock_start
= ALIGN_DOWN(new_size
, fs_info
->sectorsize
);
4178 struct extent_state
*cached_state
= NULL
;
4180 BUG_ON(new_size
> 0 && min_type
!= BTRFS_EXTENT_DATA_KEY
);
4183 * For non-free space inodes and non-shareable roots, we want to back
4184 * off from time to time. This means all inodes in subvolume roots,
4185 * reloc roots, and data reloc roots.
4187 if (!btrfs_is_free_space_inode(BTRFS_I(inode
)) &&
4188 test_bit(BTRFS_ROOT_SHAREABLE
, &root
->state
))
4191 path
= btrfs_alloc_path();
4194 path
->reada
= READA_BACK
;
4196 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
4197 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, lock_start
, (u64
)-1,
4201 * We want to drop from the next block forward in case this
4202 * new size is not block aligned since we will be keeping the
4203 * last block of the extent just the way it is.
4205 btrfs_drop_extent_cache(BTRFS_I(inode
), ALIGN(new_size
,
4206 fs_info
->sectorsize
),
4211 * This function is also used to drop the items in the log tree before
4212 * we relog the inode, so if root != BTRFS_I(inode)->root, it means
4213 * it is used to drop the logged items. So we shouldn't kill the delayed
4216 if (min_type
== 0 && root
== BTRFS_I(inode
)->root
)
4217 btrfs_kill_delayed_inode_items(BTRFS_I(inode
));
4220 key
.offset
= (u64
)-1;
4225 * with a 16K leaf size and 128MB extents, you can actually queue
4226 * up a huge file in a single leaf. Most of the time that
4227 * bytes_deleted is > 0, it will be huge by the time we get here
4229 if (be_nice
&& bytes_deleted
> SZ_32M
&&
4230 btrfs_should_end_transaction(trans
)) {
4235 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
4241 /* there are no items in the tree for us to truncate, we're
4244 if (path
->slots
[0] == 0)
4250 u64 clear_start
= 0, clear_len
= 0;
4253 leaf
= path
->nodes
[0];
4254 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
4255 found_type
= found_key
.type
;
4257 if (found_key
.objectid
!= ino
)
4260 if (found_type
< min_type
)
4263 item_end
= found_key
.offset
;
4264 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
4265 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
4266 struct btrfs_file_extent_item
);
4267 extent_type
= btrfs_file_extent_type(leaf
, fi
);
4268 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
4270 btrfs_file_extent_num_bytes(leaf
, fi
);
4272 trace_btrfs_truncate_show_fi_regular(
4273 BTRFS_I(inode
), leaf
, fi
,
4275 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
4276 item_end
+= btrfs_file_extent_ram_bytes(leaf
,
4279 trace_btrfs_truncate_show_fi_inline(
4280 BTRFS_I(inode
), leaf
, fi
, path
->slots
[0],
4285 if (found_type
> min_type
) {
4288 if (item_end
< new_size
)
4290 if (found_key
.offset
>= new_size
)
4296 /* FIXME, shrink the extent if the ref count is only 1 */
4297 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
4300 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
4303 clear_start
= found_key
.offset
;
4304 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
4306 u64 orig_num_bytes
=
4307 btrfs_file_extent_num_bytes(leaf
, fi
);
4308 extent_num_bytes
= ALIGN(new_size
-
4310 fs_info
->sectorsize
);
4311 clear_start
= ALIGN(new_size
, fs_info
->sectorsize
);
4312 btrfs_set_file_extent_num_bytes(leaf
, fi
,
4314 num_dec
= (orig_num_bytes
-
4316 if (test_bit(BTRFS_ROOT_SHAREABLE
,
4319 inode_sub_bytes(inode
, num_dec
);
4320 btrfs_mark_buffer_dirty(leaf
);
4323 btrfs_file_extent_disk_num_bytes(leaf
,
4325 extent_offset
= found_key
.offset
-
4326 btrfs_file_extent_offset(leaf
, fi
);
4328 /* FIXME blocksize != 4096 */
4329 num_dec
= btrfs_file_extent_num_bytes(leaf
, fi
);
4330 if (extent_start
!= 0) {
4332 if (test_bit(BTRFS_ROOT_SHAREABLE
,
4334 inode_sub_bytes(inode
, num_dec
);
4337 clear_len
= num_dec
;
4338 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
4340 * we can't truncate inline items that have had
4344 btrfs_file_extent_encryption(leaf
, fi
) == 0 &&
4345 btrfs_file_extent_other_encoding(leaf
, fi
) == 0 &&
4346 btrfs_file_extent_compression(leaf
, fi
) == 0) {
4347 u32 size
= (u32
)(new_size
- found_key
.offset
);
4349 btrfs_set_file_extent_ram_bytes(leaf
, fi
, size
);
4350 size
= btrfs_file_extent_calc_inline_size(size
);
4351 btrfs_truncate_item(path
, size
, 1);
4352 } else if (!del_item
) {
4354 * We have to bail so the last_size is set to
4355 * just before this extent.
4357 ret
= NEED_TRUNCATE_BLOCK
;
4361 * Inline extents are special, we just treat
4362 * them as a full sector worth in the file
4363 * extent tree just for simplicity sake.
4365 clear_len
= fs_info
->sectorsize
;
4368 if (test_bit(BTRFS_ROOT_SHAREABLE
, &root
->state
))
4369 inode_sub_bytes(inode
, item_end
+ 1 - new_size
);
4373 * We use btrfs_truncate_inode_items() to clean up log trees for
4374 * multiple fsyncs, and in this case we don't want to clear the
4375 * file extent range because it's just the log.
4377 if (root
== BTRFS_I(inode
)->root
) {
4378 ret
= btrfs_inode_clear_file_extent_range(BTRFS_I(inode
),
4379 clear_start
, clear_len
);
4381 btrfs_abort_transaction(trans
, ret
);
4387 last_size
= found_key
.offset
;
4389 last_size
= new_size
;
4391 if (!pending_del_nr
) {
4392 /* no pending yet, add ourselves */
4393 pending_del_slot
= path
->slots
[0];
4395 } else if (pending_del_nr
&&
4396 path
->slots
[0] + 1 == pending_del_slot
) {
4397 /* hop on the pending chunk */
4399 pending_del_slot
= path
->slots
[0];
4406 should_throttle
= false;
4409 root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
4410 struct btrfs_ref ref
= { 0 };
4412 bytes_deleted
+= extent_num_bytes
;
4414 btrfs_init_generic_ref(&ref
, BTRFS_DROP_DELAYED_REF
,
4415 extent_start
, extent_num_bytes
, 0);
4416 ref
.real_root
= root
->root_key
.objectid
;
4417 btrfs_init_data_ref(&ref
, btrfs_header_owner(leaf
),
4418 ino
, extent_offset
);
4419 ret
= btrfs_free_extent(trans
, &ref
);
4421 btrfs_abort_transaction(trans
, ret
);
4425 if (btrfs_should_throttle_delayed_refs(trans
))
4426 should_throttle
= true;
4430 if (found_type
== BTRFS_INODE_ITEM_KEY
)
4433 if (path
->slots
[0] == 0 ||
4434 path
->slots
[0] != pending_del_slot
||
4436 if (pending_del_nr
) {
4437 ret
= btrfs_del_items(trans
, root
, path
,
4441 btrfs_abort_transaction(trans
, ret
);
4446 btrfs_release_path(path
);
4449 * We can generate a lot of delayed refs, so we need to
4450 * throttle every once and a while and make sure we're
4451 * adding enough space to keep up with the work we are
4452 * generating. Since we hold a transaction here we
4453 * can't flush, and we don't want to FLUSH_LIMIT because
4454 * we could have generated too many delayed refs to
4455 * actually allocate, so just bail if we're short and
4456 * let the normal reservation dance happen higher up.
4458 if (should_throttle
) {
4459 ret
= btrfs_delayed_refs_rsv_refill(fs_info
,
4460 BTRFS_RESERVE_NO_FLUSH
);
4472 if (ret
>= 0 && pending_del_nr
) {
4475 err
= btrfs_del_items(trans
, root
, path
, pending_del_slot
,
4478 btrfs_abort_transaction(trans
, err
);
4482 if (root
->root_key
.objectid
!= BTRFS_TREE_LOG_OBJECTID
) {
4483 ASSERT(last_size
>= new_size
);
4484 if (!ret
&& last_size
> new_size
)
4485 last_size
= new_size
;
4486 btrfs_inode_safe_disk_i_size_write(inode
, last_size
);
4487 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, lock_start
,
4488 (u64
)-1, &cached_state
);
4491 btrfs_free_path(path
);
4496 * btrfs_truncate_block - read, zero a chunk and write a block
4497 * @inode - inode that we're zeroing
4498 * @from - the offset to start zeroing
4499 * @len - the length to zero, 0 to zero the entire range respective to the
4501 * @front - zero up to the offset instead of from the offset on
4503 * This will find the block for the "from" offset and cow the block and zero the
4504 * part we want to zero. This is used with truncate and hole punching.
4506 int btrfs_truncate_block(struct inode
*inode
, loff_t from
, loff_t len
,
4509 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4510 struct address_space
*mapping
= inode
->i_mapping
;
4511 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4512 struct btrfs_ordered_extent
*ordered
;
4513 struct extent_state
*cached_state
= NULL
;
4514 struct extent_changeset
*data_reserved
= NULL
;
4516 bool only_release_metadata
= false;
4517 u32 blocksize
= fs_info
->sectorsize
;
4518 pgoff_t index
= from
>> PAGE_SHIFT
;
4519 unsigned offset
= from
& (blocksize
- 1);
4521 gfp_t mask
= btrfs_alloc_write_mask(mapping
);
4522 size_t write_bytes
= blocksize
;
4527 if (IS_ALIGNED(offset
, blocksize
) &&
4528 (!len
|| IS_ALIGNED(len
, blocksize
)))
4531 block_start
= round_down(from
, blocksize
);
4532 block_end
= block_start
+ blocksize
- 1;
4534 ret
= btrfs_check_data_free_space(BTRFS_I(inode
), &data_reserved
,
4535 block_start
, blocksize
);
4537 if (btrfs_check_nocow_lock(BTRFS_I(inode
), block_start
,
4538 &write_bytes
) > 0) {
4539 /* For nocow case, no need to reserve data space */
4540 only_release_metadata
= true;
4545 ret
= btrfs_delalloc_reserve_metadata(BTRFS_I(inode
), blocksize
);
4547 if (!only_release_metadata
)
4548 btrfs_free_reserved_data_space(BTRFS_I(inode
),
4549 data_reserved
, block_start
, blocksize
);
4553 page
= find_or_create_page(mapping
, index
, mask
);
4555 btrfs_delalloc_release_space(BTRFS_I(inode
), data_reserved
,
4556 block_start
, blocksize
, true);
4557 btrfs_delalloc_release_extents(BTRFS_I(inode
), blocksize
);
4562 if (!PageUptodate(page
)) {
4563 ret
= btrfs_readpage(NULL
, page
);
4565 if (page
->mapping
!= mapping
) {
4570 if (!PageUptodate(page
)) {
4575 wait_on_page_writeback(page
);
4577 lock_extent_bits(io_tree
, block_start
, block_end
, &cached_state
);
4578 set_page_extent_mapped(page
);
4580 ordered
= btrfs_lookup_ordered_extent(BTRFS_I(inode
), block_start
);
4582 unlock_extent_cached(io_tree
, block_start
, block_end
,
4586 btrfs_start_ordered_extent(inode
, ordered
, 1);
4587 btrfs_put_ordered_extent(ordered
);
4591 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, block_start
, block_end
,
4592 EXTENT_DELALLOC
| EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
,
4593 0, 0, &cached_state
);
4595 ret
= btrfs_set_extent_delalloc(BTRFS_I(inode
), block_start
, block_end
, 0,
4598 unlock_extent_cached(io_tree
, block_start
, block_end
,
4603 if (offset
!= blocksize
) {
4605 len
= blocksize
- offset
;
4608 memset(kaddr
+ (block_start
- page_offset(page
)),
4611 memset(kaddr
+ (block_start
- page_offset(page
)) + offset
,
4613 flush_dcache_page(page
);
4616 ClearPageChecked(page
);
4617 set_page_dirty(page
);
4618 unlock_extent_cached(io_tree
, block_start
, block_end
, &cached_state
);
4620 if (only_release_metadata
)
4621 set_extent_bit(&BTRFS_I(inode
)->io_tree
, block_start
,
4622 block_end
, EXTENT_NORESERVE
, NULL
, NULL
,
4627 if (only_release_metadata
)
4628 btrfs_delalloc_release_metadata(BTRFS_I(inode
),
4631 btrfs_delalloc_release_space(BTRFS_I(inode
), data_reserved
,
4632 block_start
, blocksize
, true);
4634 btrfs_delalloc_release_extents(BTRFS_I(inode
), blocksize
);
4638 if (only_release_metadata
)
4639 btrfs_check_nocow_unlock(BTRFS_I(inode
));
4640 extent_changeset_free(data_reserved
);
4644 static int maybe_insert_hole(struct btrfs_root
*root
, struct inode
*inode
,
4645 u64 offset
, u64 len
)
4647 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4648 struct btrfs_trans_handle
*trans
;
4652 * Still need to make sure the inode looks like it's been updated so
4653 * that any holes get logged if we fsync.
4655 if (btrfs_fs_incompat(fs_info
, NO_HOLES
)) {
4656 BTRFS_I(inode
)->last_trans
= fs_info
->generation
;
4657 BTRFS_I(inode
)->last_sub_trans
= root
->log_transid
;
4658 BTRFS_I(inode
)->last_log_commit
= root
->last_log_commit
;
4663 * 1 - for the one we're dropping
4664 * 1 - for the one we're adding
4665 * 1 - for updating the inode.
4667 trans
= btrfs_start_transaction(root
, 3);
4669 return PTR_ERR(trans
);
4671 ret
= btrfs_drop_extents(trans
, root
, inode
, offset
, offset
+ len
, 1);
4673 btrfs_abort_transaction(trans
, ret
);
4674 btrfs_end_transaction(trans
);
4678 ret
= btrfs_insert_file_extent(trans
, root
, btrfs_ino(BTRFS_I(inode
)),
4679 offset
, 0, 0, len
, 0, len
, 0, 0, 0);
4681 btrfs_abort_transaction(trans
, ret
);
4683 btrfs_update_inode(trans
, root
, inode
);
4684 btrfs_end_transaction(trans
);
4689 * This function puts in dummy file extents for the area we're creating a hole
4690 * for. So if we are truncating this file to a larger size we need to insert
4691 * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for
4692 * the range between oldsize and size
4694 int btrfs_cont_expand(struct inode
*inode
, loff_t oldsize
, loff_t size
)
4696 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
4697 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4698 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4699 struct extent_map
*em
= NULL
;
4700 struct extent_state
*cached_state
= NULL
;
4701 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
4702 u64 hole_start
= ALIGN(oldsize
, fs_info
->sectorsize
);
4703 u64 block_end
= ALIGN(size
, fs_info
->sectorsize
);
4710 * If our size started in the middle of a block we need to zero out the
4711 * rest of the block before we expand the i_size, otherwise we could
4712 * expose stale data.
4714 err
= btrfs_truncate_block(inode
, oldsize
, 0, 0);
4718 if (size
<= hole_start
)
4721 btrfs_lock_and_flush_ordered_range(BTRFS_I(inode
), hole_start
,
4722 block_end
- 1, &cached_state
);
4723 cur_offset
= hole_start
;
4725 em
= btrfs_get_extent(BTRFS_I(inode
), NULL
, 0, cur_offset
,
4726 block_end
- cur_offset
);
4732 last_byte
= min(extent_map_end(em
), block_end
);
4733 last_byte
= ALIGN(last_byte
, fs_info
->sectorsize
);
4734 hole_size
= last_byte
- cur_offset
;
4736 if (!test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
)) {
4737 struct extent_map
*hole_em
;
4739 err
= maybe_insert_hole(root
, inode
, cur_offset
,
4744 err
= btrfs_inode_set_file_extent_range(BTRFS_I(inode
),
4745 cur_offset
, hole_size
);
4749 btrfs_drop_extent_cache(BTRFS_I(inode
), cur_offset
,
4750 cur_offset
+ hole_size
- 1, 0);
4751 hole_em
= alloc_extent_map();
4753 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
4754 &BTRFS_I(inode
)->runtime_flags
);
4757 hole_em
->start
= cur_offset
;
4758 hole_em
->len
= hole_size
;
4759 hole_em
->orig_start
= cur_offset
;
4761 hole_em
->block_start
= EXTENT_MAP_HOLE
;
4762 hole_em
->block_len
= 0;
4763 hole_em
->orig_block_len
= 0;
4764 hole_em
->ram_bytes
= hole_size
;
4765 hole_em
->compress_type
= BTRFS_COMPRESS_NONE
;
4766 hole_em
->generation
= fs_info
->generation
;
4769 write_lock(&em_tree
->lock
);
4770 err
= add_extent_mapping(em_tree
, hole_em
, 1);
4771 write_unlock(&em_tree
->lock
);
4774 btrfs_drop_extent_cache(BTRFS_I(inode
),
4779 free_extent_map(hole_em
);
4781 err
= btrfs_inode_set_file_extent_range(BTRFS_I(inode
),
4782 cur_offset
, hole_size
);
4787 free_extent_map(em
);
4789 cur_offset
= last_byte
;
4790 if (cur_offset
>= block_end
)
4793 free_extent_map(em
);
4794 unlock_extent_cached(io_tree
, hole_start
, block_end
- 1, &cached_state
);
4798 static int btrfs_setsize(struct inode
*inode
, struct iattr
*attr
)
4800 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4801 struct btrfs_trans_handle
*trans
;
4802 loff_t oldsize
= i_size_read(inode
);
4803 loff_t newsize
= attr
->ia_size
;
4804 int mask
= attr
->ia_valid
;
4808 * The regular truncate() case without ATTR_CTIME and ATTR_MTIME is a
4809 * special case where we need to update the times despite not having
4810 * these flags set. For all other operations the VFS set these flags
4811 * explicitly if it wants a timestamp update.
4813 if (newsize
!= oldsize
) {
4814 inode_inc_iversion(inode
);
4815 if (!(mask
& (ATTR_CTIME
| ATTR_MTIME
)))
4816 inode
->i_ctime
= inode
->i_mtime
=
4817 current_time(inode
);
4820 if (newsize
> oldsize
) {
4822 * Don't do an expanding truncate while snapshotting is ongoing.
4823 * This is to ensure the snapshot captures a fully consistent
4824 * state of this file - if the snapshot captures this expanding
4825 * truncation, it must capture all writes that happened before
4828 btrfs_drew_write_lock(&root
->snapshot_lock
);
4829 ret
= btrfs_cont_expand(inode
, oldsize
, newsize
);
4831 btrfs_drew_write_unlock(&root
->snapshot_lock
);
4835 trans
= btrfs_start_transaction(root
, 1);
4836 if (IS_ERR(trans
)) {
4837 btrfs_drew_write_unlock(&root
->snapshot_lock
);
4838 return PTR_ERR(trans
);
4841 i_size_write(inode
, newsize
);
4842 btrfs_inode_safe_disk_i_size_write(inode
, 0);
4843 pagecache_isize_extended(inode
, oldsize
, newsize
);
4844 ret
= btrfs_update_inode(trans
, root
, inode
);
4845 btrfs_drew_write_unlock(&root
->snapshot_lock
);
4846 btrfs_end_transaction(trans
);
4850 * We're truncating a file that used to have good data down to
4851 * zero. Make sure it gets into the ordered flush list so that
4852 * any new writes get down to disk quickly.
4855 set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE
,
4856 &BTRFS_I(inode
)->runtime_flags
);
4858 truncate_setsize(inode
, newsize
);
4860 /* Disable nonlocked read DIO to avoid the endless truncate */
4861 btrfs_inode_block_unlocked_dio(BTRFS_I(inode
));
4862 inode_dio_wait(inode
);
4863 btrfs_inode_resume_unlocked_dio(BTRFS_I(inode
));
4865 ret
= btrfs_truncate(inode
, newsize
== oldsize
);
4866 if (ret
&& inode
->i_nlink
) {
4870 * Truncate failed, so fix up the in-memory size. We
4871 * adjusted disk_i_size down as we removed extents, so
4872 * wait for disk_i_size to be stable and then update the
4873 * in-memory size to match.
4875 err
= btrfs_wait_ordered_range(inode
, 0, (u64
)-1);
4878 i_size_write(inode
, BTRFS_I(inode
)->disk_i_size
);
4885 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
4887 struct inode
*inode
= d_inode(dentry
);
4888 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
4891 if (btrfs_root_readonly(root
))
4894 err
= setattr_prepare(dentry
, attr
);
4898 if (S_ISREG(inode
->i_mode
) && (attr
->ia_valid
& ATTR_SIZE
)) {
4899 err
= btrfs_setsize(inode
, attr
);
4904 if (attr
->ia_valid
) {
4905 setattr_copy(inode
, attr
);
4906 inode_inc_iversion(inode
);
4907 err
= btrfs_dirty_inode(inode
);
4909 if (!err
&& attr
->ia_valid
& ATTR_MODE
)
4910 err
= posix_acl_chmod(inode
, inode
->i_mode
);
4917 * While truncating the inode pages during eviction, we get the VFS calling
4918 * btrfs_invalidatepage() against each page of the inode. This is slow because
4919 * the calls to btrfs_invalidatepage() result in a huge amount of calls to
4920 * lock_extent_bits() and clear_extent_bit(), which keep merging and splitting
4921 * extent_state structures over and over, wasting lots of time.
4923 * Therefore if the inode is being evicted, let btrfs_invalidatepage() skip all
4924 * those expensive operations on a per page basis and do only the ordered io
4925 * finishing, while we release here the extent_map and extent_state structures,
4926 * without the excessive merging and splitting.
4928 static void evict_inode_truncate_pages(struct inode
*inode
)
4930 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
4931 struct extent_map_tree
*map_tree
= &BTRFS_I(inode
)->extent_tree
;
4932 struct rb_node
*node
;
4934 ASSERT(inode
->i_state
& I_FREEING
);
4935 truncate_inode_pages_final(&inode
->i_data
);
4937 write_lock(&map_tree
->lock
);
4938 while (!RB_EMPTY_ROOT(&map_tree
->map
.rb_root
)) {
4939 struct extent_map
*em
;
4941 node
= rb_first_cached(&map_tree
->map
);
4942 em
= rb_entry(node
, struct extent_map
, rb_node
);
4943 clear_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
4944 clear_bit(EXTENT_FLAG_LOGGING
, &em
->flags
);
4945 remove_extent_mapping(map_tree
, em
);
4946 free_extent_map(em
);
4947 if (need_resched()) {
4948 write_unlock(&map_tree
->lock
);
4950 write_lock(&map_tree
->lock
);
4953 write_unlock(&map_tree
->lock
);
4956 * Keep looping until we have no more ranges in the io tree.
4957 * We can have ongoing bios started by readahead that have
4958 * their endio callback (extent_io.c:end_bio_extent_readpage)
4959 * still in progress (unlocked the pages in the bio but did not yet
4960 * unlocked the ranges in the io tree). Therefore this means some
4961 * ranges can still be locked and eviction started because before
4962 * submitting those bios, which are executed by a separate task (work
4963 * queue kthread), inode references (inode->i_count) were not taken
4964 * (which would be dropped in the end io callback of each bio).
4965 * Therefore here we effectively end up waiting for those bios and
4966 * anyone else holding locked ranges without having bumped the inode's
4967 * reference count - if we don't do it, when they access the inode's
4968 * io_tree to unlock a range it may be too late, leading to an
4969 * use-after-free issue.
4971 spin_lock(&io_tree
->lock
);
4972 while (!RB_EMPTY_ROOT(&io_tree
->state
)) {
4973 struct extent_state
*state
;
4974 struct extent_state
*cached_state
= NULL
;
4977 unsigned state_flags
;
4979 node
= rb_first(&io_tree
->state
);
4980 state
= rb_entry(node
, struct extent_state
, rb_node
);
4981 start
= state
->start
;
4983 state_flags
= state
->state
;
4984 spin_unlock(&io_tree
->lock
);
4986 lock_extent_bits(io_tree
, start
, end
, &cached_state
);
4989 * If still has DELALLOC flag, the extent didn't reach disk,
4990 * and its reserved space won't be freed by delayed_ref.
4991 * So we need to free its reserved space here.
4992 * (Refer to comment in btrfs_invalidatepage, case 2)
4994 * Note, end is the bytenr of last byte, so we need + 1 here.
4996 if (state_flags
& EXTENT_DELALLOC
)
4997 btrfs_qgroup_free_data(BTRFS_I(inode
), NULL
, start
,
5000 clear_extent_bit(io_tree
, start
, end
,
5001 EXTENT_LOCKED
| EXTENT_DELALLOC
|
5002 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
, 1, 1,
5006 spin_lock(&io_tree
->lock
);
5008 spin_unlock(&io_tree
->lock
);
5011 static struct btrfs_trans_handle
*evict_refill_and_join(struct btrfs_root
*root
,
5012 struct btrfs_block_rsv
*rsv
)
5014 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5015 struct btrfs_block_rsv
*global_rsv
= &fs_info
->global_block_rsv
;
5016 struct btrfs_trans_handle
*trans
;
5017 u64 delayed_refs_extra
= btrfs_calc_insert_metadata_size(fs_info
, 1);
5021 * Eviction should be taking place at some place safe because of our
5022 * delayed iputs. However the normal flushing code will run delayed
5023 * iputs, so we cannot use FLUSH_ALL otherwise we'll deadlock.
5025 * We reserve the delayed_refs_extra here again because we can't use
5026 * btrfs_start_transaction(root, 0) for the same deadlocky reason as
5027 * above. We reserve our extra bit here because we generate a ton of
5028 * delayed refs activity by truncating.
5030 * If we cannot make our reservation we'll attempt to steal from the
5031 * global reserve, because we really want to be able to free up space.
5033 ret
= btrfs_block_rsv_refill(root
, rsv
, rsv
->size
+ delayed_refs_extra
,
5034 BTRFS_RESERVE_FLUSH_EVICT
);
5037 * Try to steal from the global reserve if there is space for
5040 if (btrfs_check_space_for_delayed_refs(fs_info
) ||
5041 btrfs_block_rsv_migrate(global_rsv
, rsv
, rsv
->size
, 0)) {
5043 "could not allocate space for delete; will truncate on mount");
5044 return ERR_PTR(-ENOSPC
);
5046 delayed_refs_extra
= 0;
5049 trans
= btrfs_join_transaction(root
);
5053 if (delayed_refs_extra
) {
5054 trans
->block_rsv
= &fs_info
->trans_block_rsv
;
5055 trans
->bytes_reserved
= delayed_refs_extra
;
5056 btrfs_block_rsv_migrate(rsv
, trans
->block_rsv
,
5057 delayed_refs_extra
, 1);
5062 void btrfs_evict_inode(struct inode
*inode
)
5064 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5065 struct btrfs_trans_handle
*trans
;
5066 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5067 struct btrfs_block_rsv
*rsv
;
5070 trace_btrfs_inode_evict(inode
);
5077 evict_inode_truncate_pages(inode
);
5079 if (inode
->i_nlink
&&
5080 ((btrfs_root_refs(&root
->root_item
) != 0 &&
5081 root
->root_key
.objectid
!= BTRFS_ROOT_TREE_OBJECTID
) ||
5082 btrfs_is_free_space_inode(BTRFS_I(inode
))))
5085 if (is_bad_inode(inode
))
5088 btrfs_free_io_failure_record(BTRFS_I(inode
), 0, (u64
)-1);
5090 if (test_bit(BTRFS_FS_LOG_RECOVERING
, &fs_info
->flags
))
5093 if (inode
->i_nlink
> 0) {
5094 BUG_ON(btrfs_root_refs(&root
->root_item
) != 0 &&
5095 root
->root_key
.objectid
!= BTRFS_ROOT_TREE_OBJECTID
);
5099 ret
= btrfs_commit_inode_delayed_inode(BTRFS_I(inode
));
5103 rsv
= btrfs_alloc_block_rsv(fs_info
, BTRFS_BLOCK_RSV_TEMP
);
5106 rsv
->size
= btrfs_calc_metadata_size(fs_info
, 1);
5109 btrfs_i_size_write(BTRFS_I(inode
), 0);
5112 trans
= evict_refill_and_join(root
, rsv
);
5116 trans
->block_rsv
= rsv
;
5118 ret
= btrfs_truncate_inode_items(trans
, root
, inode
, 0, 0);
5119 trans
->block_rsv
= &fs_info
->trans_block_rsv
;
5120 btrfs_end_transaction(trans
);
5121 btrfs_btree_balance_dirty(fs_info
);
5122 if (ret
&& ret
!= -ENOSPC
&& ret
!= -EAGAIN
)
5129 * Errors here aren't a big deal, it just means we leave orphan items in
5130 * the tree. They will be cleaned up on the next mount. If the inode
5131 * number gets reused, cleanup deletes the orphan item without doing
5132 * anything, and unlink reuses the existing orphan item.
5134 * If it turns out that we are dropping too many of these, we might want
5135 * to add a mechanism for retrying these after a commit.
5137 trans
= evict_refill_and_join(root
, rsv
);
5138 if (!IS_ERR(trans
)) {
5139 trans
->block_rsv
= rsv
;
5140 btrfs_orphan_del(trans
, BTRFS_I(inode
));
5141 trans
->block_rsv
= &fs_info
->trans_block_rsv
;
5142 btrfs_end_transaction(trans
);
5145 if (!(root
== fs_info
->tree_root
||
5146 root
->root_key
.objectid
== BTRFS_TREE_RELOC_OBJECTID
))
5147 btrfs_return_ino(root
, btrfs_ino(BTRFS_I(inode
)));
5150 btrfs_free_block_rsv(fs_info
, rsv
);
5153 * If we didn't successfully delete, the orphan item will still be in
5154 * the tree and we'll retry on the next mount. Again, we might also want
5155 * to retry these periodically in the future.
5157 btrfs_remove_delayed_node(BTRFS_I(inode
));
5162 * Return the key found in the dir entry in the location pointer, fill @type
5163 * with BTRFS_FT_*, and return 0.
5165 * If no dir entries were found, returns -ENOENT.
5166 * If found a corrupted location in dir entry, returns -EUCLEAN.
5168 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
5169 struct btrfs_key
*location
, u8
*type
)
5171 const char *name
= dentry
->d_name
.name
;
5172 int namelen
= dentry
->d_name
.len
;
5173 struct btrfs_dir_item
*di
;
5174 struct btrfs_path
*path
;
5175 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
5178 path
= btrfs_alloc_path();
5182 di
= btrfs_lookup_dir_item(NULL
, root
, path
, btrfs_ino(BTRFS_I(dir
)),
5184 if (IS_ERR_OR_NULL(di
)) {
5185 ret
= di
? PTR_ERR(di
) : -ENOENT
;
5189 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
5190 if (location
->type
!= BTRFS_INODE_ITEM_KEY
&&
5191 location
->type
!= BTRFS_ROOT_ITEM_KEY
) {
5193 btrfs_warn(root
->fs_info
,
5194 "%s gets something invalid in DIR_ITEM (name %s, directory ino %llu, location(%llu %u %llu))",
5195 __func__
, name
, btrfs_ino(BTRFS_I(dir
)),
5196 location
->objectid
, location
->type
, location
->offset
);
5199 *type
= btrfs_dir_type(path
->nodes
[0], di
);
5201 btrfs_free_path(path
);
5206 * when we hit a tree root in a directory, the btrfs part of the inode
5207 * needs to be changed to reflect the root directory of the tree root. This
5208 * is kind of like crossing a mount point.
5210 static int fixup_tree_root_location(struct btrfs_fs_info
*fs_info
,
5212 struct dentry
*dentry
,
5213 struct btrfs_key
*location
,
5214 struct btrfs_root
**sub_root
)
5216 struct btrfs_path
*path
;
5217 struct btrfs_root
*new_root
;
5218 struct btrfs_root_ref
*ref
;
5219 struct extent_buffer
*leaf
;
5220 struct btrfs_key key
;
5224 path
= btrfs_alloc_path();
5231 key
.objectid
= BTRFS_I(dir
)->root
->root_key
.objectid
;
5232 key
.type
= BTRFS_ROOT_REF_KEY
;
5233 key
.offset
= location
->objectid
;
5235 ret
= btrfs_search_slot(NULL
, fs_info
->tree_root
, &key
, path
, 0, 0);
5242 leaf
= path
->nodes
[0];
5243 ref
= btrfs_item_ptr(leaf
, path
->slots
[0], struct btrfs_root_ref
);
5244 if (btrfs_root_ref_dirid(leaf
, ref
) != btrfs_ino(BTRFS_I(dir
)) ||
5245 btrfs_root_ref_name_len(leaf
, ref
) != dentry
->d_name
.len
)
5248 ret
= memcmp_extent_buffer(leaf
, dentry
->d_name
.name
,
5249 (unsigned long)(ref
+ 1),
5250 dentry
->d_name
.len
);
5254 btrfs_release_path(path
);
5256 new_root
= btrfs_get_fs_root(fs_info
, location
->objectid
, true);
5257 if (IS_ERR(new_root
)) {
5258 err
= PTR_ERR(new_root
);
5262 *sub_root
= new_root
;
5263 location
->objectid
= btrfs_root_dirid(&new_root
->root_item
);
5264 location
->type
= BTRFS_INODE_ITEM_KEY
;
5265 location
->offset
= 0;
5268 btrfs_free_path(path
);
5272 static void inode_tree_add(struct inode
*inode
)
5274 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5275 struct btrfs_inode
*entry
;
5277 struct rb_node
*parent
;
5278 struct rb_node
*new = &BTRFS_I(inode
)->rb_node
;
5279 u64 ino
= btrfs_ino(BTRFS_I(inode
));
5281 if (inode_unhashed(inode
))
5284 spin_lock(&root
->inode_lock
);
5285 p
= &root
->inode_tree
.rb_node
;
5288 entry
= rb_entry(parent
, struct btrfs_inode
, rb_node
);
5290 if (ino
< btrfs_ino(entry
))
5291 p
= &parent
->rb_left
;
5292 else if (ino
> btrfs_ino(entry
))
5293 p
= &parent
->rb_right
;
5295 WARN_ON(!(entry
->vfs_inode
.i_state
&
5296 (I_WILL_FREE
| I_FREEING
)));
5297 rb_replace_node(parent
, new, &root
->inode_tree
);
5298 RB_CLEAR_NODE(parent
);
5299 spin_unlock(&root
->inode_lock
);
5303 rb_link_node(new, parent
, p
);
5304 rb_insert_color(new, &root
->inode_tree
);
5305 spin_unlock(&root
->inode_lock
);
5308 static void inode_tree_del(struct inode
*inode
)
5310 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5313 spin_lock(&root
->inode_lock
);
5314 if (!RB_EMPTY_NODE(&BTRFS_I(inode
)->rb_node
)) {
5315 rb_erase(&BTRFS_I(inode
)->rb_node
, &root
->inode_tree
);
5316 RB_CLEAR_NODE(&BTRFS_I(inode
)->rb_node
);
5317 empty
= RB_EMPTY_ROOT(&root
->inode_tree
);
5319 spin_unlock(&root
->inode_lock
);
5321 if (empty
&& btrfs_root_refs(&root
->root_item
) == 0) {
5322 spin_lock(&root
->inode_lock
);
5323 empty
= RB_EMPTY_ROOT(&root
->inode_tree
);
5324 spin_unlock(&root
->inode_lock
);
5326 btrfs_add_dead_root(root
);
5331 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
5333 struct btrfs_iget_args
*args
= p
;
5335 inode
->i_ino
= args
->ino
;
5336 BTRFS_I(inode
)->location
.objectid
= args
->ino
;
5337 BTRFS_I(inode
)->location
.type
= BTRFS_INODE_ITEM_KEY
;
5338 BTRFS_I(inode
)->location
.offset
= 0;
5339 BTRFS_I(inode
)->root
= btrfs_grab_root(args
->root
);
5340 BUG_ON(args
->root
&& !BTRFS_I(inode
)->root
);
5344 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
5346 struct btrfs_iget_args
*args
= opaque
;
5348 return args
->ino
== BTRFS_I(inode
)->location
.objectid
&&
5349 args
->root
== BTRFS_I(inode
)->root
;
5352 static struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 ino
,
5353 struct btrfs_root
*root
)
5355 struct inode
*inode
;
5356 struct btrfs_iget_args args
;
5357 unsigned long hashval
= btrfs_inode_hash(ino
, root
);
5362 inode
= iget5_locked(s
, hashval
, btrfs_find_actor
,
5363 btrfs_init_locked_inode
,
5369 * Get an inode object given its inode number and corresponding root.
5370 * Path can be preallocated to prevent recursing back to iget through
5371 * allocator. NULL is also valid but may require an additional allocation
5374 struct inode
*btrfs_iget_path(struct super_block
*s
, u64 ino
,
5375 struct btrfs_root
*root
, struct btrfs_path
*path
)
5377 struct inode
*inode
;
5379 inode
= btrfs_iget_locked(s
, ino
, root
);
5381 return ERR_PTR(-ENOMEM
);
5383 if (inode
->i_state
& I_NEW
) {
5386 ret
= btrfs_read_locked_inode(inode
, path
);
5388 inode_tree_add(inode
);
5389 unlock_new_inode(inode
);
5393 * ret > 0 can come from btrfs_search_slot called by
5394 * btrfs_read_locked_inode, this means the inode item
5399 inode
= ERR_PTR(ret
);
5406 struct inode
*btrfs_iget(struct super_block
*s
, u64 ino
, struct btrfs_root
*root
)
5408 return btrfs_iget_path(s
, ino
, root
, NULL
);
5411 static struct inode
*new_simple_dir(struct super_block
*s
,
5412 struct btrfs_key
*key
,
5413 struct btrfs_root
*root
)
5415 struct inode
*inode
= new_inode(s
);
5418 return ERR_PTR(-ENOMEM
);
5420 BTRFS_I(inode
)->root
= btrfs_grab_root(root
);
5421 memcpy(&BTRFS_I(inode
)->location
, key
, sizeof(*key
));
5422 set_bit(BTRFS_INODE_DUMMY
, &BTRFS_I(inode
)->runtime_flags
);
5424 inode
->i_ino
= BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
;
5426 * We only need lookup, the rest is read-only and there's no inode
5427 * associated with the dentry
5429 inode
->i_op
= &simple_dir_inode_operations
;
5430 inode
->i_opflags
&= ~IOP_XATTR
;
5431 inode
->i_fop
= &simple_dir_operations
;
5432 inode
->i_mode
= S_IFDIR
| S_IRUGO
| S_IWUSR
| S_IXUGO
;
5433 inode
->i_mtime
= current_time(inode
);
5434 inode
->i_atime
= inode
->i_mtime
;
5435 inode
->i_ctime
= inode
->i_mtime
;
5436 BTRFS_I(inode
)->i_otime
= inode
->i_mtime
;
5441 static inline u8
btrfs_inode_type(struct inode
*inode
)
5444 * Compile-time asserts that generic FT_* types still match
5447 BUILD_BUG_ON(BTRFS_FT_UNKNOWN
!= FT_UNKNOWN
);
5448 BUILD_BUG_ON(BTRFS_FT_REG_FILE
!= FT_REG_FILE
);
5449 BUILD_BUG_ON(BTRFS_FT_DIR
!= FT_DIR
);
5450 BUILD_BUG_ON(BTRFS_FT_CHRDEV
!= FT_CHRDEV
);
5451 BUILD_BUG_ON(BTRFS_FT_BLKDEV
!= FT_BLKDEV
);
5452 BUILD_BUG_ON(BTRFS_FT_FIFO
!= FT_FIFO
);
5453 BUILD_BUG_ON(BTRFS_FT_SOCK
!= FT_SOCK
);
5454 BUILD_BUG_ON(BTRFS_FT_SYMLINK
!= FT_SYMLINK
);
5456 return fs_umode_to_ftype(inode
->i_mode
);
5459 struct inode
*btrfs_lookup_dentry(struct inode
*dir
, struct dentry
*dentry
)
5461 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
5462 struct inode
*inode
;
5463 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
5464 struct btrfs_root
*sub_root
= root
;
5465 struct btrfs_key location
;
5469 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
5470 return ERR_PTR(-ENAMETOOLONG
);
5472 ret
= btrfs_inode_by_name(dir
, dentry
, &location
, &di_type
);
5474 return ERR_PTR(ret
);
5476 if (location
.type
== BTRFS_INODE_ITEM_KEY
) {
5477 inode
= btrfs_iget(dir
->i_sb
, location
.objectid
, root
);
5481 /* Do extra check against inode mode with di_type */
5482 if (btrfs_inode_type(inode
) != di_type
) {
5484 "inode mode mismatch with dir: inode mode=0%o btrfs type=%u dir type=%u",
5485 inode
->i_mode
, btrfs_inode_type(inode
),
5488 return ERR_PTR(-EUCLEAN
);
5493 ret
= fixup_tree_root_location(fs_info
, dir
, dentry
,
5494 &location
, &sub_root
);
5497 inode
= ERR_PTR(ret
);
5499 inode
= new_simple_dir(dir
->i_sb
, &location
, sub_root
);
5501 inode
= btrfs_iget(dir
->i_sb
, location
.objectid
, sub_root
);
5503 if (root
!= sub_root
)
5504 btrfs_put_root(sub_root
);
5506 if (!IS_ERR(inode
) && root
!= sub_root
) {
5507 down_read(&fs_info
->cleanup_work_sem
);
5508 if (!sb_rdonly(inode
->i_sb
))
5509 ret
= btrfs_orphan_cleanup(sub_root
);
5510 up_read(&fs_info
->cleanup_work_sem
);
5513 inode
= ERR_PTR(ret
);
5520 static int btrfs_dentry_delete(const struct dentry
*dentry
)
5522 struct btrfs_root
*root
;
5523 struct inode
*inode
= d_inode(dentry
);
5525 if (!inode
&& !IS_ROOT(dentry
))
5526 inode
= d_inode(dentry
->d_parent
);
5529 root
= BTRFS_I(inode
)->root
;
5530 if (btrfs_root_refs(&root
->root_item
) == 0)
5533 if (btrfs_ino(BTRFS_I(inode
)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)
5539 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
5542 struct inode
*inode
= btrfs_lookup_dentry(dir
, dentry
);
5544 if (inode
== ERR_PTR(-ENOENT
))
5546 return d_splice_alias(inode
, dentry
);
5550 * All this infrastructure exists because dir_emit can fault, and we are holding
5551 * the tree lock when doing readdir. For now just allocate a buffer and copy
5552 * our information into that, and then dir_emit from the buffer. This is
5553 * similar to what NFS does, only we don't keep the buffer around in pagecache
5554 * because I'm afraid I'll mess that up. Long term we need to make filldir do
5555 * copy_to_user_inatomic so we don't have to worry about page faulting under the
5558 static int btrfs_opendir(struct inode
*inode
, struct file
*file
)
5560 struct btrfs_file_private
*private;
5562 private = kzalloc(sizeof(struct btrfs_file_private
), GFP_KERNEL
);
5565 private->filldir_buf
= kzalloc(PAGE_SIZE
, GFP_KERNEL
);
5566 if (!private->filldir_buf
) {
5570 file
->private_data
= private;
5581 static int btrfs_filldir(void *addr
, int entries
, struct dir_context
*ctx
)
5584 struct dir_entry
*entry
= addr
;
5585 char *name
= (char *)(entry
+ 1);
5587 ctx
->pos
= get_unaligned(&entry
->offset
);
5588 if (!dir_emit(ctx
, name
, get_unaligned(&entry
->name_len
),
5589 get_unaligned(&entry
->ino
),
5590 get_unaligned(&entry
->type
)))
5592 addr
+= sizeof(struct dir_entry
) +
5593 get_unaligned(&entry
->name_len
);
5599 static int btrfs_real_readdir(struct file
*file
, struct dir_context
*ctx
)
5601 struct inode
*inode
= file_inode(file
);
5602 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5603 struct btrfs_file_private
*private = file
->private_data
;
5604 struct btrfs_dir_item
*di
;
5605 struct btrfs_key key
;
5606 struct btrfs_key found_key
;
5607 struct btrfs_path
*path
;
5609 struct list_head ins_list
;
5610 struct list_head del_list
;
5612 struct extent_buffer
*leaf
;
5619 struct btrfs_key location
;
5621 if (!dir_emit_dots(file
, ctx
))
5624 path
= btrfs_alloc_path();
5628 addr
= private->filldir_buf
;
5629 path
->reada
= READA_FORWARD
;
5631 INIT_LIST_HEAD(&ins_list
);
5632 INIT_LIST_HEAD(&del_list
);
5633 put
= btrfs_readdir_get_delayed_items(inode
, &ins_list
, &del_list
);
5636 key
.type
= BTRFS_DIR_INDEX_KEY
;
5637 key
.offset
= ctx
->pos
;
5638 key
.objectid
= btrfs_ino(BTRFS_I(inode
));
5640 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
5645 struct dir_entry
*entry
;
5647 leaf
= path
->nodes
[0];
5648 slot
= path
->slots
[0];
5649 if (slot
>= btrfs_header_nritems(leaf
)) {
5650 ret
= btrfs_next_leaf(root
, path
);
5658 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
5660 if (found_key
.objectid
!= key
.objectid
)
5662 if (found_key
.type
!= BTRFS_DIR_INDEX_KEY
)
5664 if (found_key
.offset
< ctx
->pos
)
5666 if (btrfs_should_delete_dir_index(&del_list
, found_key
.offset
))
5668 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
5669 name_len
= btrfs_dir_name_len(leaf
, di
);
5670 if ((total_len
+ sizeof(struct dir_entry
) + name_len
) >=
5672 btrfs_release_path(path
);
5673 ret
= btrfs_filldir(private->filldir_buf
, entries
, ctx
);
5676 addr
= private->filldir_buf
;
5683 put_unaligned(name_len
, &entry
->name_len
);
5684 name_ptr
= (char *)(entry
+ 1);
5685 read_extent_buffer(leaf
, name_ptr
, (unsigned long)(di
+ 1),
5687 put_unaligned(fs_ftype_to_dtype(btrfs_dir_type(leaf
, di
)),
5689 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
5690 put_unaligned(location
.objectid
, &entry
->ino
);
5691 put_unaligned(found_key
.offset
, &entry
->offset
);
5693 addr
+= sizeof(struct dir_entry
) + name_len
;
5694 total_len
+= sizeof(struct dir_entry
) + name_len
;
5698 btrfs_release_path(path
);
5700 ret
= btrfs_filldir(private->filldir_buf
, entries
, ctx
);
5704 ret
= btrfs_readdir_delayed_dir_index(ctx
, &ins_list
);
5709 * Stop new entries from being returned after we return the last
5712 * New directory entries are assigned a strictly increasing
5713 * offset. This means that new entries created during readdir
5714 * are *guaranteed* to be seen in the future by that readdir.
5715 * This has broken buggy programs which operate on names as
5716 * they're returned by readdir. Until we re-use freed offsets
5717 * we have this hack to stop new entries from being returned
5718 * under the assumption that they'll never reach this huge
5721 * This is being careful not to overflow 32bit loff_t unless the
5722 * last entry requires it because doing so has broken 32bit apps
5725 if (ctx
->pos
>= INT_MAX
)
5726 ctx
->pos
= LLONG_MAX
;
5733 btrfs_readdir_put_delayed_items(inode
, &ins_list
, &del_list
);
5734 btrfs_free_path(path
);
5739 * This is somewhat expensive, updating the tree every time the
5740 * inode changes. But, it is most likely to find the inode in cache.
5741 * FIXME, needs more benchmarking...there are no reasons other than performance
5742 * to keep or drop this code.
5744 static int btrfs_dirty_inode(struct inode
*inode
)
5746 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
5747 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5748 struct btrfs_trans_handle
*trans
;
5751 if (test_bit(BTRFS_INODE_DUMMY
, &BTRFS_I(inode
)->runtime_flags
))
5754 trans
= btrfs_join_transaction(root
);
5756 return PTR_ERR(trans
);
5758 ret
= btrfs_update_inode(trans
, root
, inode
);
5759 if (ret
&& ret
== -ENOSPC
) {
5760 /* whoops, lets try again with the full transaction */
5761 btrfs_end_transaction(trans
);
5762 trans
= btrfs_start_transaction(root
, 1);
5764 return PTR_ERR(trans
);
5766 ret
= btrfs_update_inode(trans
, root
, inode
);
5768 btrfs_end_transaction(trans
);
5769 if (BTRFS_I(inode
)->delayed_node
)
5770 btrfs_balance_delayed_items(fs_info
);
5776 * This is a copy of file_update_time. We need this so we can return error on
5777 * ENOSPC for updating the inode in the case of file write and mmap writes.
5779 static int btrfs_update_time(struct inode
*inode
, struct timespec64
*now
,
5782 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
5783 bool dirty
= flags
& ~S_VERSION
;
5785 if (btrfs_root_readonly(root
))
5788 if (flags
& S_VERSION
)
5789 dirty
|= inode_maybe_inc_iversion(inode
, dirty
);
5790 if (flags
& S_CTIME
)
5791 inode
->i_ctime
= *now
;
5792 if (flags
& S_MTIME
)
5793 inode
->i_mtime
= *now
;
5794 if (flags
& S_ATIME
)
5795 inode
->i_atime
= *now
;
5796 return dirty
? btrfs_dirty_inode(inode
) : 0;
5800 * find the highest existing sequence number in a directory
5801 * and then set the in-memory index_cnt variable to reflect
5802 * free sequence numbers
5804 static int btrfs_set_inode_index_count(struct btrfs_inode
*inode
)
5806 struct btrfs_root
*root
= inode
->root
;
5807 struct btrfs_key key
, found_key
;
5808 struct btrfs_path
*path
;
5809 struct extent_buffer
*leaf
;
5812 key
.objectid
= btrfs_ino(inode
);
5813 key
.type
= BTRFS_DIR_INDEX_KEY
;
5814 key
.offset
= (u64
)-1;
5816 path
= btrfs_alloc_path();
5820 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
5823 /* FIXME: we should be able to handle this */
5829 * MAGIC NUMBER EXPLANATION:
5830 * since we search a directory based on f_pos we have to start at 2
5831 * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody
5832 * else has to start at 2
5834 if (path
->slots
[0] == 0) {
5835 inode
->index_cnt
= 2;
5841 leaf
= path
->nodes
[0];
5842 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
5844 if (found_key
.objectid
!= btrfs_ino(inode
) ||
5845 found_key
.type
!= BTRFS_DIR_INDEX_KEY
) {
5846 inode
->index_cnt
= 2;
5850 inode
->index_cnt
= found_key
.offset
+ 1;
5852 btrfs_free_path(path
);
5857 * helper to find a free sequence number in a given directory. This current
5858 * code is very simple, later versions will do smarter things in the btree
5860 int btrfs_set_inode_index(struct btrfs_inode
*dir
, u64
*index
)
5864 if (dir
->index_cnt
== (u64
)-1) {
5865 ret
= btrfs_inode_delayed_dir_index_count(dir
);
5867 ret
= btrfs_set_inode_index_count(dir
);
5873 *index
= dir
->index_cnt
;
5879 static int btrfs_insert_inode_locked(struct inode
*inode
)
5881 struct btrfs_iget_args args
;
5883 args
.ino
= BTRFS_I(inode
)->location
.objectid
;
5884 args
.root
= BTRFS_I(inode
)->root
;
5886 return insert_inode_locked4(inode
,
5887 btrfs_inode_hash(inode
->i_ino
, BTRFS_I(inode
)->root
),
5888 btrfs_find_actor
, &args
);
5892 * Inherit flags from the parent inode.
5894 * Currently only the compression flags and the cow flags are inherited.
5896 static void btrfs_inherit_iflags(struct inode
*inode
, struct inode
*dir
)
5903 flags
= BTRFS_I(dir
)->flags
;
5905 if (flags
& BTRFS_INODE_NOCOMPRESS
) {
5906 BTRFS_I(inode
)->flags
&= ~BTRFS_INODE_COMPRESS
;
5907 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NOCOMPRESS
;
5908 } else if (flags
& BTRFS_INODE_COMPRESS
) {
5909 BTRFS_I(inode
)->flags
&= ~BTRFS_INODE_NOCOMPRESS
;
5910 BTRFS_I(inode
)->flags
|= BTRFS_INODE_COMPRESS
;
5913 if (flags
& BTRFS_INODE_NODATACOW
) {
5914 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATACOW
;
5915 if (S_ISREG(inode
->i_mode
))
5916 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATASUM
;
5919 btrfs_sync_inode_flags_to_i_flags(inode
);
5922 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
5923 struct btrfs_root
*root
,
5925 const char *name
, int name_len
,
5926 u64 ref_objectid
, u64 objectid
,
5927 umode_t mode
, u64
*index
)
5929 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
5930 struct inode
*inode
;
5931 struct btrfs_inode_item
*inode_item
;
5932 struct btrfs_key
*location
;
5933 struct btrfs_path
*path
;
5934 struct btrfs_inode_ref
*ref
;
5935 struct btrfs_key key
[2];
5937 int nitems
= name
? 2 : 1;
5939 unsigned int nofs_flag
;
5942 path
= btrfs_alloc_path();
5944 return ERR_PTR(-ENOMEM
);
5946 nofs_flag
= memalloc_nofs_save();
5947 inode
= new_inode(fs_info
->sb
);
5948 memalloc_nofs_restore(nofs_flag
);
5950 btrfs_free_path(path
);
5951 return ERR_PTR(-ENOMEM
);
5955 * O_TMPFILE, set link count to 0, so that after this point,
5956 * we fill in an inode item with the correct link count.
5959 set_nlink(inode
, 0);
5962 * we have to initialize this early, so we can reclaim the inode
5963 * number if we fail afterwards in this function.
5965 inode
->i_ino
= objectid
;
5968 trace_btrfs_inode_request(dir
);
5970 ret
= btrfs_set_inode_index(BTRFS_I(dir
), index
);
5972 btrfs_free_path(path
);
5974 return ERR_PTR(ret
);
5980 * index_cnt is ignored for everything but a dir,
5981 * btrfs_set_inode_index_count has an explanation for the magic
5984 BTRFS_I(inode
)->index_cnt
= 2;
5985 BTRFS_I(inode
)->dir_index
= *index
;
5986 BTRFS_I(inode
)->root
= btrfs_grab_root(root
);
5987 BTRFS_I(inode
)->generation
= trans
->transid
;
5988 inode
->i_generation
= BTRFS_I(inode
)->generation
;
5991 * We could have gotten an inode number from somebody who was fsynced
5992 * and then removed in this same transaction, so let's just set full
5993 * sync since it will be a full sync anyway and this will blow away the
5994 * old info in the log.
5996 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &BTRFS_I(inode
)->runtime_flags
);
5998 key
[0].objectid
= objectid
;
5999 key
[0].type
= BTRFS_INODE_ITEM_KEY
;
6002 sizes
[0] = sizeof(struct btrfs_inode_item
);
6006 * Start new inodes with an inode_ref. This is slightly more
6007 * efficient for small numbers of hard links since they will
6008 * be packed into one item. Extended refs will kick in if we
6009 * add more hard links than can fit in the ref item.
6011 key
[1].objectid
= objectid
;
6012 key
[1].type
= BTRFS_INODE_REF_KEY
;
6013 key
[1].offset
= ref_objectid
;
6015 sizes
[1] = name_len
+ sizeof(*ref
);
6018 location
= &BTRFS_I(inode
)->location
;
6019 location
->objectid
= objectid
;
6020 location
->offset
= 0;
6021 location
->type
= BTRFS_INODE_ITEM_KEY
;
6023 ret
= btrfs_insert_inode_locked(inode
);
6029 path
->leave_spinning
= 1;
6030 ret
= btrfs_insert_empty_items(trans
, root
, path
, key
, sizes
, nitems
);
6034 inode_init_owner(inode
, dir
, mode
);
6035 inode_set_bytes(inode
, 0);
6037 inode
->i_mtime
= current_time(inode
);
6038 inode
->i_atime
= inode
->i_mtime
;
6039 inode
->i_ctime
= inode
->i_mtime
;
6040 BTRFS_I(inode
)->i_otime
= inode
->i_mtime
;
6042 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
6043 struct btrfs_inode_item
);
6044 memzero_extent_buffer(path
->nodes
[0], (unsigned long)inode_item
,
6045 sizeof(*inode_item
));
6046 fill_inode_item(trans
, path
->nodes
[0], inode_item
, inode
);
6049 ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0] + 1,
6050 struct btrfs_inode_ref
);
6051 btrfs_set_inode_ref_name_len(path
->nodes
[0], ref
, name_len
);
6052 btrfs_set_inode_ref_index(path
->nodes
[0], ref
, *index
);
6053 ptr
= (unsigned long)(ref
+ 1);
6054 write_extent_buffer(path
->nodes
[0], name
, ptr
, name_len
);
6057 btrfs_mark_buffer_dirty(path
->nodes
[0]);
6058 btrfs_free_path(path
);
6060 btrfs_inherit_iflags(inode
, dir
);
6062 if (S_ISREG(mode
)) {
6063 if (btrfs_test_opt(fs_info
, NODATASUM
))
6064 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATASUM
;
6065 if (btrfs_test_opt(fs_info
, NODATACOW
))
6066 BTRFS_I(inode
)->flags
|= BTRFS_INODE_NODATACOW
|
6067 BTRFS_INODE_NODATASUM
;
6070 inode_tree_add(inode
);
6072 trace_btrfs_inode_new(inode
);
6073 btrfs_set_inode_last_trans(trans
, BTRFS_I(inode
));
6075 btrfs_update_root_times(trans
, root
);
6077 ret
= btrfs_inode_inherit_props(trans
, inode
, dir
);
6080 "error inheriting props for ino %llu (root %llu): %d",
6081 btrfs_ino(BTRFS_I(inode
)), root
->root_key
.objectid
, ret
);
6086 discard_new_inode(inode
);
6089 BTRFS_I(dir
)->index_cnt
--;
6090 btrfs_free_path(path
);
6091 return ERR_PTR(ret
);
6095 * utility function to add 'inode' into 'parent_inode' with
6096 * a give name and a given sequence number.
6097 * if 'add_backref' is true, also insert a backref from the
6098 * inode to the parent directory.
6100 int btrfs_add_link(struct btrfs_trans_handle
*trans
,
6101 struct btrfs_inode
*parent_inode
, struct btrfs_inode
*inode
,
6102 const char *name
, int name_len
, int add_backref
, u64 index
)
6105 struct btrfs_key key
;
6106 struct btrfs_root
*root
= parent_inode
->root
;
6107 u64 ino
= btrfs_ino(inode
);
6108 u64 parent_ino
= btrfs_ino(parent_inode
);
6110 if (unlikely(ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
6111 memcpy(&key
, &inode
->root
->root_key
, sizeof(key
));
6114 key
.type
= BTRFS_INODE_ITEM_KEY
;
6118 if (unlikely(ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
6119 ret
= btrfs_add_root_ref(trans
, key
.objectid
,
6120 root
->root_key
.objectid
, parent_ino
,
6121 index
, name
, name_len
);
6122 } else if (add_backref
) {
6123 ret
= btrfs_insert_inode_ref(trans
, root
, name
, name_len
, ino
,
6127 /* Nothing to clean up yet */
6131 ret
= btrfs_insert_dir_item(trans
, name
, name_len
, parent_inode
, &key
,
6132 btrfs_inode_type(&inode
->vfs_inode
), index
);
6133 if (ret
== -EEXIST
|| ret
== -EOVERFLOW
)
6136 btrfs_abort_transaction(trans
, ret
);
6140 btrfs_i_size_write(parent_inode
, parent_inode
->vfs_inode
.i_size
+
6142 inode_inc_iversion(&parent_inode
->vfs_inode
);
6144 * If we are replaying a log tree, we do not want to update the mtime
6145 * and ctime of the parent directory with the current time, since the
6146 * log replay procedure is responsible for setting them to their correct
6147 * values (the ones it had when the fsync was done).
6149 if (!test_bit(BTRFS_FS_LOG_RECOVERING
, &root
->fs_info
->flags
)) {
6150 struct timespec64 now
= current_time(&parent_inode
->vfs_inode
);
6152 parent_inode
->vfs_inode
.i_mtime
= now
;
6153 parent_inode
->vfs_inode
.i_ctime
= now
;
6155 ret
= btrfs_update_inode(trans
, root
, &parent_inode
->vfs_inode
);
6157 btrfs_abort_transaction(trans
, ret
);
6161 if (unlikely(ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
6164 err
= btrfs_del_root_ref(trans
, key
.objectid
,
6165 root
->root_key
.objectid
, parent_ino
,
6166 &local_index
, name
, name_len
);
6168 btrfs_abort_transaction(trans
, err
);
6169 } else if (add_backref
) {
6173 err
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
6174 ino
, parent_ino
, &local_index
);
6176 btrfs_abort_transaction(trans
, err
);
6179 /* Return the original error code */
6183 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
6184 struct btrfs_inode
*dir
, struct dentry
*dentry
,
6185 struct btrfs_inode
*inode
, int backref
, u64 index
)
6187 int err
= btrfs_add_link(trans
, dir
, inode
,
6188 dentry
->d_name
.name
, dentry
->d_name
.len
,
6195 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
6196 umode_t mode
, dev_t rdev
)
6198 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
6199 struct btrfs_trans_handle
*trans
;
6200 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
6201 struct inode
*inode
= NULL
;
6207 * 2 for inode item and ref
6209 * 1 for xattr if selinux is on
6211 trans
= btrfs_start_transaction(root
, 5);
6213 return PTR_ERR(trans
);
6215 err
= btrfs_find_free_ino(root
, &objectid
);
6219 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
6220 dentry
->d_name
.len
, btrfs_ino(BTRFS_I(dir
)), objectid
,
6222 if (IS_ERR(inode
)) {
6223 err
= PTR_ERR(inode
);
6229 * If the active LSM wants to access the inode during
6230 * d_instantiate it needs these. Smack checks to see
6231 * if the filesystem supports xattrs by looking at the
6234 inode
->i_op
= &btrfs_special_inode_operations
;
6235 init_special_inode(inode
, inode
->i_mode
, rdev
);
6237 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
6241 err
= btrfs_add_nondir(trans
, BTRFS_I(dir
), dentry
, BTRFS_I(inode
),
6246 btrfs_update_inode(trans
, root
, inode
);
6247 d_instantiate_new(dentry
, inode
);
6250 btrfs_end_transaction(trans
);
6251 btrfs_btree_balance_dirty(fs_info
);
6253 inode_dec_link_count(inode
);
6254 discard_new_inode(inode
);
6259 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
6260 umode_t mode
, bool excl
)
6262 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
6263 struct btrfs_trans_handle
*trans
;
6264 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
6265 struct inode
*inode
= NULL
;
6271 * 2 for inode item and ref
6273 * 1 for xattr if selinux is on
6275 trans
= btrfs_start_transaction(root
, 5);
6277 return PTR_ERR(trans
);
6279 err
= btrfs_find_free_ino(root
, &objectid
);
6283 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
6284 dentry
->d_name
.len
, btrfs_ino(BTRFS_I(dir
)), objectid
,
6286 if (IS_ERR(inode
)) {
6287 err
= PTR_ERR(inode
);
6292 * If the active LSM wants to access the inode during
6293 * d_instantiate it needs these. Smack checks to see
6294 * if the filesystem supports xattrs by looking at the
6297 inode
->i_fop
= &btrfs_file_operations
;
6298 inode
->i_op
= &btrfs_file_inode_operations
;
6299 inode
->i_mapping
->a_ops
= &btrfs_aops
;
6301 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
6305 err
= btrfs_update_inode(trans
, root
, inode
);
6309 err
= btrfs_add_nondir(trans
, BTRFS_I(dir
), dentry
, BTRFS_I(inode
),
6314 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
6315 d_instantiate_new(dentry
, inode
);
6318 btrfs_end_transaction(trans
);
6320 inode_dec_link_count(inode
);
6321 discard_new_inode(inode
);
6323 btrfs_btree_balance_dirty(fs_info
);
6327 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
6328 struct dentry
*dentry
)
6330 struct btrfs_trans_handle
*trans
= NULL
;
6331 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
6332 struct inode
*inode
= d_inode(old_dentry
);
6333 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
6338 /* do not allow sys_link's with other subvols of the same device */
6339 if (root
->root_key
.objectid
!= BTRFS_I(inode
)->root
->root_key
.objectid
)
6342 if (inode
->i_nlink
>= BTRFS_LINK_MAX
)
6345 err
= btrfs_set_inode_index(BTRFS_I(dir
), &index
);
6350 * 2 items for inode and inode ref
6351 * 2 items for dir items
6352 * 1 item for parent inode
6353 * 1 item for orphan item deletion if O_TMPFILE
6355 trans
= btrfs_start_transaction(root
, inode
->i_nlink
? 5 : 6);
6356 if (IS_ERR(trans
)) {
6357 err
= PTR_ERR(trans
);
6362 /* There are several dir indexes for this inode, clear the cache. */
6363 BTRFS_I(inode
)->dir_index
= 0ULL;
6365 inode_inc_iversion(inode
);
6366 inode
->i_ctime
= current_time(inode
);
6368 set_bit(BTRFS_INODE_COPY_EVERYTHING
, &BTRFS_I(inode
)->runtime_flags
);
6370 err
= btrfs_add_nondir(trans
, BTRFS_I(dir
), dentry
, BTRFS_I(inode
),
6376 struct dentry
*parent
= dentry
->d_parent
;
6379 err
= btrfs_update_inode(trans
, root
, inode
);
6382 if (inode
->i_nlink
== 1) {
6384 * If new hard link count is 1, it's a file created
6385 * with open(2) O_TMPFILE flag.
6387 err
= btrfs_orphan_del(trans
, BTRFS_I(inode
));
6391 d_instantiate(dentry
, inode
);
6392 ret
= btrfs_log_new_name(trans
, BTRFS_I(inode
), NULL
, parent
,
6394 if (ret
== BTRFS_NEED_TRANS_COMMIT
) {
6395 err
= btrfs_commit_transaction(trans
);
6402 btrfs_end_transaction(trans
);
6404 inode_dec_link_count(inode
);
6407 btrfs_btree_balance_dirty(fs_info
);
6411 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
6413 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
6414 struct inode
*inode
= NULL
;
6415 struct btrfs_trans_handle
*trans
;
6416 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
6422 * 2 items for inode and ref
6423 * 2 items for dir items
6424 * 1 for xattr if selinux is on
6426 trans
= btrfs_start_transaction(root
, 5);
6428 return PTR_ERR(trans
);
6430 err
= btrfs_find_free_ino(root
, &objectid
);
6434 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
6435 dentry
->d_name
.len
, btrfs_ino(BTRFS_I(dir
)), objectid
,
6436 S_IFDIR
| mode
, &index
);
6437 if (IS_ERR(inode
)) {
6438 err
= PTR_ERR(inode
);
6443 /* these must be set before we unlock the inode */
6444 inode
->i_op
= &btrfs_dir_inode_operations
;
6445 inode
->i_fop
= &btrfs_dir_file_operations
;
6447 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
6451 btrfs_i_size_write(BTRFS_I(inode
), 0);
6452 err
= btrfs_update_inode(trans
, root
, inode
);
6456 err
= btrfs_add_link(trans
, BTRFS_I(dir
), BTRFS_I(inode
),
6457 dentry
->d_name
.name
,
6458 dentry
->d_name
.len
, 0, index
);
6462 d_instantiate_new(dentry
, inode
);
6465 btrfs_end_transaction(trans
);
6467 inode_dec_link_count(inode
);
6468 discard_new_inode(inode
);
6470 btrfs_btree_balance_dirty(fs_info
);
6474 static noinline
int uncompress_inline(struct btrfs_path
*path
,
6476 size_t pg_offset
, u64 extent_offset
,
6477 struct btrfs_file_extent_item
*item
)
6480 struct extent_buffer
*leaf
= path
->nodes
[0];
6483 unsigned long inline_size
;
6487 WARN_ON(pg_offset
!= 0);
6488 compress_type
= btrfs_file_extent_compression(leaf
, item
);
6489 max_size
= btrfs_file_extent_ram_bytes(leaf
, item
);
6490 inline_size
= btrfs_file_extent_inline_item_len(leaf
,
6491 btrfs_item_nr(path
->slots
[0]));
6492 tmp
= kmalloc(inline_size
, GFP_NOFS
);
6495 ptr
= btrfs_file_extent_inline_start(item
);
6497 read_extent_buffer(leaf
, tmp
, ptr
, inline_size
);
6499 max_size
= min_t(unsigned long, PAGE_SIZE
, max_size
);
6500 ret
= btrfs_decompress(compress_type
, tmp
, page
,
6501 extent_offset
, inline_size
, max_size
);
6504 * decompression code contains a memset to fill in any space between the end
6505 * of the uncompressed data and the end of max_size in case the decompressed
6506 * data ends up shorter than ram_bytes. That doesn't cover the hole between
6507 * the end of an inline extent and the beginning of the next block, so we
6508 * cover that region here.
6511 if (max_size
+ pg_offset
< PAGE_SIZE
) {
6512 char *map
= kmap(page
);
6513 memset(map
+ pg_offset
+ max_size
, 0, PAGE_SIZE
- max_size
- pg_offset
);
6521 * btrfs_get_extent - Lookup the first extent overlapping a range in a file.
6522 * @inode: file to search in
6523 * @page: page to read extent data into if the extent is inline
6524 * @pg_offset: offset into @page to copy to
6525 * @start: file offset
6526 * @len: length of range starting at @start
6528 * This returns the first &struct extent_map which overlaps with the given
6529 * range, reading it from the B-tree and caching it if necessary. Note that
6530 * there may be more extents which overlap the given range after the returned
6533 * If @page is not NULL and the extent is inline, this also reads the extent
6534 * data directly into the page and marks the extent up to date in the io_tree.
6536 * Return: ERR_PTR on error, non-NULL extent_map on success.
6538 struct extent_map
*btrfs_get_extent(struct btrfs_inode
*inode
,
6539 struct page
*page
, size_t pg_offset
,
6542 struct btrfs_fs_info
*fs_info
= inode
->root
->fs_info
;
6545 u64 extent_start
= 0;
6547 u64 objectid
= btrfs_ino(inode
);
6548 int extent_type
= -1;
6549 struct btrfs_path
*path
= NULL
;
6550 struct btrfs_root
*root
= inode
->root
;
6551 struct btrfs_file_extent_item
*item
;
6552 struct extent_buffer
*leaf
;
6553 struct btrfs_key found_key
;
6554 struct extent_map
*em
= NULL
;
6555 struct extent_map_tree
*em_tree
= &inode
->extent_tree
;
6556 struct extent_io_tree
*io_tree
= &inode
->io_tree
;
6558 read_lock(&em_tree
->lock
);
6559 em
= lookup_extent_mapping(em_tree
, start
, len
);
6560 read_unlock(&em_tree
->lock
);
6563 if (em
->start
> start
|| em
->start
+ em
->len
<= start
)
6564 free_extent_map(em
);
6565 else if (em
->block_start
== EXTENT_MAP_INLINE
&& page
)
6566 free_extent_map(em
);
6570 em
= alloc_extent_map();
6575 em
->start
= EXTENT_MAP_HOLE
;
6576 em
->orig_start
= EXTENT_MAP_HOLE
;
6578 em
->block_len
= (u64
)-1;
6580 path
= btrfs_alloc_path();
6586 /* Chances are we'll be called again, so go ahead and do readahead */
6587 path
->reada
= READA_FORWARD
;
6590 * Unless we're going to uncompress the inline extent, no sleep would
6593 path
->leave_spinning
= 1;
6595 ret
= btrfs_lookup_file_extent(NULL
, root
, path
, objectid
, start
, 0);
6599 } else if (ret
> 0) {
6600 if (path
->slots
[0] == 0)
6605 leaf
= path
->nodes
[0];
6606 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
6607 struct btrfs_file_extent_item
);
6608 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
6609 if (found_key
.objectid
!= objectid
||
6610 found_key
.type
!= BTRFS_EXTENT_DATA_KEY
) {
6612 * If we backup past the first extent we want to move forward
6613 * and see if there is an extent in front of us, otherwise we'll
6614 * say there is a hole for our whole search range which can
6621 extent_type
= btrfs_file_extent_type(leaf
, item
);
6622 extent_start
= found_key
.offset
;
6623 extent_end
= btrfs_file_extent_end(path
);
6624 if (extent_type
== BTRFS_FILE_EXTENT_REG
||
6625 extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
6626 /* Only regular file could have regular/prealloc extent */
6627 if (!S_ISREG(inode
->vfs_inode
.i_mode
)) {
6630 "regular/prealloc extent found for non-regular inode %llu",
6634 trace_btrfs_get_extent_show_fi_regular(inode
, leaf
, item
,
6636 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
6637 trace_btrfs_get_extent_show_fi_inline(inode
, leaf
, item
,
6642 if (start
>= extent_end
) {
6644 if (path
->slots
[0] >= btrfs_header_nritems(leaf
)) {
6645 ret
= btrfs_next_leaf(root
, path
);
6649 } else if (ret
> 0) {
6652 leaf
= path
->nodes
[0];
6654 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
6655 if (found_key
.objectid
!= objectid
||
6656 found_key
.type
!= BTRFS_EXTENT_DATA_KEY
)
6658 if (start
+ len
<= found_key
.offset
)
6660 if (start
> found_key
.offset
)
6663 /* New extent overlaps with existing one */
6665 em
->orig_start
= start
;
6666 em
->len
= found_key
.offset
- start
;
6667 em
->block_start
= EXTENT_MAP_HOLE
;
6671 btrfs_extent_item_to_extent_map(inode
, path
, item
, !page
, em
);
6673 if (extent_type
== BTRFS_FILE_EXTENT_REG
||
6674 extent_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
6676 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
6680 size_t extent_offset
;
6686 size
= btrfs_file_extent_ram_bytes(leaf
, item
);
6687 extent_offset
= page_offset(page
) + pg_offset
- extent_start
;
6688 copy_size
= min_t(u64
, PAGE_SIZE
- pg_offset
,
6689 size
- extent_offset
);
6690 em
->start
= extent_start
+ extent_offset
;
6691 em
->len
= ALIGN(copy_size
, fs_info
->sectorsize
);
6692 em
->orig_block_len
= em
->len
;
6693 em
->orig_start
= em
->start
;
6694 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
6696 btrfs_set_path_blocking(path
);
6697 if (!PageUptodate(page
)) {
6698 if (btrfs_file_extent_compression(leaf
, item
) !=
6699 BTRFS_COMPRESS_NONE
) {
6700 ret
= uncompress_inline(path
, page
, pg_offset
,
6701 extent_offset
, item
);
6708 read_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
6710 if (pg_offset
+ copy_size
< PAGE_SIZE
) {
6711 memset(map
+ pg_offset
+ copy_size
, 0,
6712 PAGE_SIZE
- pg_offset
-
6717 flush_dcache_page(page
);
6719 set_extent_uptodate(io_tree
, em
->start
,
6720 extent_map_end(em
) - 1, NULL
, GFP_NOFS
);
6725 em
->orig_start
= start
;
6727 em
->block_start
= EXTENT_MAP_HOLE
;
6729 btrfs_release_path(path
);
6730 if (em
->start
> start
|| extent_map_end(em
) <= start
) {
6732 "bad extent! em: [%llu %llu] passed [%llu %llu]",
6733 em
->start
, em
->len
, start
, len
);
6739 write_lock(&em_tree
->lock
);
6740 err
= btrfs_add_extent_mapping(fs_info
, em_tree
, &em
, start
, len
);
6741 write_unlock(&em_tree
->lock
);
6743 btrfs_free_path(path
);
6745 trace_btrfs_get_extent(root
, inode
, em
);
6748 free_extent_map(em
);
6749 return ERR_PTR(err
);
6751 BUG_ON(!em
); /* Error is always set */
6755 struct extent_map
*btrfs_get_extent_fiemap(struct btrfs_inode
*inode
,
6758 struct extent_map
*em
;
6759 struct extent_map
*hole_em
= NULL
;
6760 u64 delalloc_start
= start
;
6766 em
= btrfs_get_extent(inode
, NULL
, 0, start
, len
);
6770 * If our em maps to:
6772 * - a pre-alloc extent,
6773 * there might actually be delalloc bytes behind it.
6775 if (em
->block_start
!= EXTENT_MAP_HOLE
&&
6776 !test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
6781 /* check to see if we've wrapped (len == -1 or similar) */
6790 /* ok, we didn't find anything, lets look for delalloc */
6791 delalloc_len
= count_range_bits(&inode
->io_tree
, &delalloc_start
,
6792 end
, len
, EXTENT_DELALLOC
, 1);
6793 delalloc_end
= delalloc_start
+ delalloc_len
;
6794 if (delalloc_end
< delalloc_start
)
6795 delalloc_end
= (u64
)-1;
6798 * We didn't find anything useful, return the original results from
6801 if (delalloc_start
> end
|| delalloc_end
<= start
) {
6808 * Adjust the delalloc_start to make sure it doesn't go backwards from
6809 * the start they passed in
6811 delalloc_start
= max(start
, delalloc_start
);
6812 delalloc_len
= delalloc_end
- delalloc_start
;
6814 if (delalloc_len
> 0) {
6817 const u64 hole_end
= extent_map_end(hole_em
);
6819 em
= alloc_extent_map();
6827 * When btrfs_get_extent can't find anything it returns one
6830 * Make sure what it found really fits our range, and adjust to
6831 * make sure it is based on the start from the caller
6833 if (hole_end
<= start
|| hole_em
->start
> end
) {
6834 free_extent_map(hole_em
);
6837 hole_start
= max(hole_em
->start
, start
);
6838 hole_len
= hole_end
- hole_start
;
6841 if (hole_em
&& delalloc_start
> hole_start
) {
6843 * Our hole starts before our delalloc, so we have to
6844 * return just the parts of the hole that go until the
6847 em
->len
= min(hole_len
, delalloc_start
- hole_start
);
6848 em
->start
= hole_start
;
6849 em
->orig_start
= hole_start
;
6851 * Don't adjust block start at all, it is fixed at
6854 em
->block_start
= hole_em
->block_start
;
6855 em
->block_len
= hole_len
;
6856 if (test_bit(EXTENT_FLAG_PREALLOC
, &hole_em
->flags
))
6857 set_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
);
6860 * Hole is out of passed range or it starts after
6863 em
->start
= delalloc_start
;
6864 em
->len
= delalloc_len
;
6865 em
->orig_start
= delalloc_start
;
6866 em
->block_start
= EXTENT_MAP_DELALLOC
;
6867 em
->block_len
= delalloc_len
;
6874 free_extent_map(hole_em
);
6876 free_extent_map(em
);
6877 return ERR_PTR(err
);
6882 static struct extent_map
*btrfs_create_dio_extent(struct btrfs_inode
*inode
,
6885 const u64 orig_start
,
6886 const u64 block_start
,
6887 const u64 block_len
,
6888 const u64 orig_block_len
,
6889 const u64 ram_bytes
,
6892 struct extent_map
*em
= NULL
;
6895 if (type
!= BTRFS_ORDERED_NOCOW
) {
6896 em
= create_io_em(inode
, start
, len
, orig_start
, block_start
,
6897 block_len
, orig_block_len
, ram_bytes
,
6898 BTRFS_COMPRESS_NONE
, /* compress_type */
6903 ret
= btrfs_add_ordered_extent_dio(inode
, start
, block_start
, len
,
6907 free_extent_map(em
);
6908 btrfs_drop_extent_cache(inode
, start
, start
+ len
- 1, 0);
6917 static struct extent_map
*btrfs_new_extent_direct(struct btrfs_inode
*inode
,
6920 struct btrfs_root
*root
= inode
->root
;
6921 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
6922 struct extent_map
*em
;
6923 struct btrfs_key ins
;
6927 alloc_hint
= get_extent_allocation_hint(inode
, start
, len
);
6928 ret
= btrfs_reserve_extent(root
, len
, len
, fs_info
->sectorsize
,
6929 0, alloc_hint
, &ins
, 1, 1);
6931 return ERR_PTR(ret
);
6933 em
= btrfs_create_dio_extent(inode
, start
, ins
.offset
, start
,
6934 ins
.objectid
, ins
.offset
, ins
.offset
,
6935 ins
.offset
, BTRFS_ORDERED_REGULAR
);
6936 btrfs_dec_block_group_reservations(fs_info
, ins
.objectid
);
6938 btrfs_free_reserved_extent(fs_info
, ins
.objectid
, ins
.offset
,
6945 * Check if we can do nocow write into the range [@offset, @offset + @len)
6947 * @offset: File offset
6948 * @len: The length to write, will be updated to the nocow writeable
6950 * @orig_start: (optional) Return the original file offset of the file extent
6951 * @orig_len: (optional) Return the original on-disk length of the file extent
6952 * @ram_bytes: (optional) Return the ram_bytes of the file extent
6953 * @strict: if true, omit optimizations that might force us into unnecessary
6954 * cow. e.g., don't trust generation number.
6956 * This function will flush ordered extents in the range to ensure proper
6957 * nocow checks for (nowait == false) case.
6960 * >0 and update @len if we can do nocow write
6961 * 0 if we can't do nocow write
6962 * <0 if error happened
6964 * NOTE: This only checks the file extents, caller is responsible to wait for
6965 * any ordered extents.
6967 noinline
int can_nocow_extent(struct inode
*inode
, u64 offset
, u64
*len
,
6968 u64
*orig_start
, u64
*orig_block_len
,
6969 u64
*ram_bytes
, bool strict
)
6971 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
6972 struct btrfs_path
*path
;
6974 struct extent_buffer
*leaf
;
6975 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
6976 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
6977 struct btrfs_file_extent_item
*fi
;
6978 struct btrfs_key key
;
6985 bool nocow
= (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
);
6987 path
= btrfs_alloc_path();
6991 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
6992 btrfs_ino(BTRFS_I(inode
)), offset
, 0);
6996 slot
= path
->slots
[0];
6999 /* can't find the item, must cow */
7006 leaf
= path
->nodes
[0];
7007 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
7008 if (key
.objectid
!= btrfs_ino(BTRFS_I(inode
)) ||
7009 key
.type
!= BTRFS_EXTENT_DATA_KEY
) {
7010 /* not our file or wrong item type, must cow */
7014 if (key
.offset
> offset
) {
7015 /* Wrong offset, must cow */
7019 fi
= btrfs_item_ptr(leaf
, slot
, struct btrfs_file_extent_item
);
7020 found_type
= btrfs_file_extent_type(leaf
, fi
);
7021 if (found_type
!= BTRFS_FILE_EXTENT_REG
&&
7022 found_type
!= BTRFS_FILE_EXTENT_PREALLOC
) {
7023 /* not a regular extent, must cow */
7027 if (!nocow
&& found_type
== BTRFS_FILE_EXTENT_REG
)
7030 extent_end
= key
.offset
+ btrfs_file_extent_num_bytes(leaf
, fi
);
7031 if (extent_end
<= offset
)
7034 disk_bytenr
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
7035 if (disk_bytenr
== 0)
7038 if (btrfs_file_extent_compression(leaf
, fi
) ||
7039 btrfs_file_extent_encryption(leaf
, fi
) ||
7040 btrfs_file_extent_other_encoding(leaf
, fi
))
7044 * Do the same check as in btrfs_cross_ref_exist but without the
7045 * unnecessary search.
7048 (btrfs_file_extent_generation(leaf
, fi
) <=
7049 btrfs_root_last_snapshot(&root
->root_item
)))
7052 backref_offset
= btrfs_file_extent_offset(leaf
, fi
);
7055 *orig_start
= key
.offset
- backref_offset
;
7056 *orig_block_len
= btrfs_file_extent_disk_num_bytes(leaf
, fi
);
7057 *ram_bytes
= btrfs_file_extent_ram_bytes(leaf
, fi
);
7060 if (btrfs_extent_readonly(fs_info
, disk_bytenr
))
7063 num_bytes
= min(offset
+ *len
, extent_end
) - offset
;
7064 if (!nocow
&& found_type
== BTRFS_FILE_EXTENT_PREALLOC
) {
7067 range_end
= round_up(offset
+ num_bytes
,
7068 root
->fs_info
->sectorsize
) - 1;
7069 ret
= test_range_bit(io_tree
, offset
, range_end
,
7070 EXTENT_DELALLOC
, 0, NULL
);
7077 btrfs_release_path(path
);
7080 * look for other files referencing this extent, if we
7081 * find any we must cow
7084 ret
= btrfs_cross_ref_exist(root
, btrfs_ino(BTRFS_I(inode
)),
7085 key
.offset
- backref_offset
, disk_bytenr
,
7093 * adjust disk_bytenr and num_bytes to cover just the bytes
7094 * in this extent we are about to write. If there
7095 * are any csums in that range we have to cow in order
7096 * to keep the csums correct
7098 disk_bytenr
+= backref_offset
;
7099 disk_bytenr
+= offset
- key
.offset
;
7100 if (csum_exist_in_range(fs_info
, disk_bytenr
, num_bytes
))
7103 * all of the above have passed, it is safe to overwrite this extent
7109 btrfs_free_path(path
);
7113 static int lock_extent_direct(struct inode
*inode
, u64 lockstart
, u64 lockend
,
7114 struct extent_state
**cached_state
, int writing
)
7116 struct btrfs_ordered_extent
*ordered
;
7120 lock_extent_bits(&BTRFS_I(inode
)->io_tree
, lockstart
, lockend
,
7123 * We're concerned with the entire range that we're going to be
7124 * doing DIO to, so we need to make sure there's no ordered
7125 * extents in this range.
7127 ordered
= btrfs_lookup_ordered_range(BTRFS_I(inode
), lockstart
,
7128 lockend
- lockstart
+ 1);
7131 * We need to make sure there are no buffered pages in this
7132 * range either, we could have raced between the invalidate in
7133 * generic_file_direct_write and locking the extent. The
7134 * invalidate needs to happen so that reads after a write do not
7138 (!writing
|| !filemap_range_has_page(inode
->i_mapping
,
7139 lockstart
, lockend
)))
7142 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, lockstart
, lockend
,
7147 * If we are doing a DIO read and the ordered extent we
7148 * found is for a buffered write, we can not wait for it
7149 * to complete and retry, because if we do so we can
7150 * deadlock with concurrent buffered writes on page
7151 * locks. This happens only if our DIO read covers more
7152 * than one extent map, if at this point has already
7153 * created an ordered extent for a previous extent map
7154 * and locked its range in the inode's io tree, and a
7155 * concurrent write against that previous extent map's
7156 * range and this range started (we unlock the ranges
7157 * in the io tree only when the bios complete and
7158 * buffered writes always lock pages before attempting
7159 * to lock range in the io tree).
7162 test_bit(BTRFS_ORDERED_DIRECT
, &ordered
->flags
))
7163 btrfs_start_ordered_extent(inode
, ordered
, 1);
7166 btrfs_put_ordered_extent(ordered
);
7169 * We could trigger writeback for this range (and wait
7170 * for it to complete) and then invalidate the pages for
7171 * this range (through invalidate_inode_pages2_range()),
7172 * but that can lead us to a deadlock with a concurrent
7173 * call to readahead (a buffered read or a defrag call
7174 * triggered a readahead) on a page lock due to an
7175 * ordered dio extent we created before but did not have
7176 * yet a corresponding bio submitted (whence it can not
7177 * complete), which makes readahead wait for that
7178 * ordered extent to complete while holding a lock on
7193 /* The callers of this must take lock_extent() */
7194 static struct extent_map
*create_io_em(struct btrfs_inode
*inode
, u64 start
,
7195 u64 len
, u64 orig_start
, u64 block_start
,
7196 u64 block_len
, u64 orig_block_len
,
7197 u64 ram_bytes
, int compress_type
,
7200 struct extent_map_tree
*em_tree
;
7201 struct extent_map
*em
;
7204 ASSERT(type
== BTRFS_ORDERED_PREALLOC
||
7205 type
== BTRFS_ORDERED_COMPRESSED
||
7206 type
== BTRFS_ORDERED_NOCOW
||
7207 type
== BTRFS_ORDERED_REGULAR
);
7209 em_tree
= &inode
->extent_tree
;
7210 em
= alloc_extent_map();
7212 return ERR_PTR(-ENOMEM
);
7215 em
->orig_start
= orig_start
;
7217 em
->block_len
= block_len
;
7218 em
->block_start
= block_start
;
7219 em
->orig_block_len
= orig_block_len
;
7220 em
->ram_bytes
= ram_bytes
;
7221 em
->generation
= -1;
7222 set_bit(EXTENT_FLAG_PINNED
, &em
->flags
);
7223 if (type
== BTRFS_ORDERED_PREALLOC
) {
7224 set_bit(EXTENT_FLAG_FILLING
, &em
->flags
);
7225 } else if (type
== BTRFS_ORDERED_COMPRESSED
) {
7226 set_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
);
7227 em
->compress_type
= compress_type
;
7231 btrfs_drop_extent_cache(inode
, em
->start
,
7232 em
->start
+ em
->len
- 1, 0);
7233 write_lock(&em_tree
->lock
);
7234 ret
= add_extent_mapping(em_tree
, em
, 1);
7235 write_unlock(&em_tree
->lock
);
7237 * The caller has taken lock_extent(), who could race with us
7240 } while (ret
== -EEXIST
);
7243 free_extent_map(em
);
7244 return ERR_PTR(ret
);
7247 /* em got 2 refs now, callers needs to do free_extent_map once. */
7252 static int btrfs_get_blocks_direct_read(struct extent_map
*em
,
7253 struct buffer_head
*bh_result
,
7254 struct inode
*inode
,
7257 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
7259 if (em
->block_start
== EXTENT_MAP_HOLE
||
7260 test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
7263 len
= min(len
, em
->len
- (start
- em
->start
));
7265 bh_result
->b_blocknr
= (em
->block_start
+ (start
- em
->start
)) >>
7267 bh_result
->b_size
= len
;
7268 bh_result
->b_bdev
= fs_info
->fs_devices
->latest_bdev
;
7269 set_buffer_mapped(bh_result
);
7274 static int btrfs_get_blocks_direct_write(struct extent_map
**map
,
7275 struct buffer_head
*bh_result
,
7276 struct inode
*inode
,
7277 struct btrfs_dio_data
*dio_data
,
7280 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
7281 struct extent_map
*em
= *map
;
7285 * We don't allocate a new extent in the following cases
7287 * 1) The inode is marked as NODATACOW. In this case we'll just use the
7289 * 2) The extent is marked as PREALLOC. We're good to go here and can
7290 * just use the extent.
7293 if (test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
) ||
7294 ((BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
) &&
7295 em
->block_start
!= EXTENT_MAP_HOLE
)) {
7297 u64 block_start
, orig_start
, orig_block_len
, ram_bytes
;
7299 if (test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
7300 type
= BTRFS_ORDERED_PREALLOC
;
7302 type
= BTRFS_ORDERED_NOCOW
;
7303 len
= min(len
, em
->len
- (start
- em
->start
));
7304 block_start
= em
->block_start
+ (start
- em
->start
);
7306 if (can_nocow_extent(inode
, start
, &len
, &orig_start
,
7307 &orig_block_len
, &ram_bytes
, false) == 1 &&
7308 btrfs_inc_nocow_writers(fs_info
, block_start
)) {
7309 struct extent_map
*em2
;
7311 em2
= btrfs_create_dio_extent(BTRFS_I(inode
), start
, len
,
7312 orig_start
, block_start
,
7313 len
, orig_block_len
,
7315 btrfs_dec_nocow_writers(fs_info
, block_start
);
7316 if (type
== BTRFS_ORDERED_PREALLOC
) {
7317 free_extent_map(em
);
7321 if (em2
&& IS_ERR(em2
)) {
7326 * For inode marked NODATACOW or extent marked PREALLOC,
7327 * use the existing or preallocated extent, so does not
7328 * need to adjust btrfs_space_info's bytes_may_use.
7330 btrfs_free_reserved_data_space_noquota(fs_info
, len
);
7335 /* this will cow the extent */
7336 len
= bh_result
->b_size
;
7337 free_extent_map(em
);
7338 *map
= em
= btrfs_new_extent_direct(BTRFS_I(inode
), start
, len
);
7344 len
= min(len
, em
->len
- (start
- em
->start
));
7347 bh_result
->b_blocknr
= (em
->block_start
+ (start
- em
->start
)) >>
7349 bh_result
->b_size
= len
;
7350 bh_result
->b_bdev
= fs_info
->fs_devices
->latest_bdev
;
7351 set_buffer_mapped(bh_result
);
7353 if (!test_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
))
7354 set_buffer_new(bh_result
);
7357 * Need to update the i_size under the extent lock so buffered
7358 * readers will get the updated i_size when we unlock.
7360 if (!dio_data
->overwrite
&& start
+ len
> i_size_read(inode
))
7361 i_size_write(inode
, start
+ len
);
7363 WARN_ON(dio_data
->reserve
< len
);
7364 dio_data
->reserve
-= len
;
7365 dio_data
->unsubmitted_oe_range_end
= start
+ len
;
7366 current
->journal_info
= dio_data
;
7371 static int btrfs_get_blocks_direct(struct inode
*inode
, sector_t iblock
,
7372 struct buffer_head
*bh_result
, int create
)
7374 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
7375 struct extent_map
*em
;
7376 struct extent_state
*cached_state
= NULL
;
7377 struct btrfs_dio_data
*dio_data
= NULL
;
7378 u64 start
= iblock
<< inode
->i_blkbits
;
7379 u64 lockstart
, lockend
;
7380 u64 len
= bh_result
->b_size
;
7384 len
= min_t(u64
, len
, fs_info
->sectorsize
);
7387 lockend
= start
+ len
- 1;
7389 if (current
->journal_info
) {
7391 * Need to pull our outstanding extents and set journal_info to NULL so
7392 * that anything that needs to check if there's a transaction doesn't get
7395 dio_data
= current
->journal_info
;
7396 current
->journal_info
= NULL
;
7400 * If this errors out it's because we couldn't invalidate pagecache for
7401 * this range and we need to fallback to buffered.
7403 if (lock_extent_direct(inode
, lockstart
, lockend
, &cached_state
,
7409 em
= btrfs_get_extent(BTRFS_I(inode
), NULL
, 0, start
, len
);
7416 * Ok for INLINE and COMPRESSED extents we need to fallback on buffered
7417 * io. INLINE is special, and we could probably kludge it in here, but
7418 * it's still buffered so for safety lets just fall back to the generic
7421 * For COMPRESSED we _have_ to read the entire extent in so we can
7422 * decompress it, so there will be buffering required no matter what we
7423 * do, so go ahead and fallback to buffered.
7425 * We return -ENOTBLK because that's what makes DIO go ahead and go back
7426 * to buffered IO. Don't blame me, this is the price we pay for using
7429 if (test_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
) ||
7430 em
->block_start
== EXTENT_MAP_INLINE
) {
7431 free_extent_map(em
);
7437 ret
= btrfs_get_blocks_direct_write(&em
, bh_result
, inode
,
7438 dio_data
, start
, len
);
7442 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, lockstart
,
7443 lockend
, &cached_state
);
7445 ret
= btrfs_get_blocks_direct_read(em
, bh_result
, inode
,
7447 /* Can be negative only if we read from a hole */
7450 free_extent_map(em
);
7454 * We need to unlock only the end area that we aren't using.
7455 * The rest is going to be unlocked by the endio routine.
7457 lockstart
= start
+ bh_result
->b_size
;
7458 if (lockstart
< lockend
) {
7459 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
,
7460 lockstart
, lockend
, &cached_state
);
7462 free_extent_state(cached_state
);
7466 free_extent_map(em
);
7471 unlock_extent_cached(&BTRFS_I(inode
)->io_tree
, lockstart
, lockend
,
7475 current
->journal_info
= dio_data
;
7479 static void btrfs_dio_private_put(struct btrfs_dio_private
*dip
)
7482 * This implies a barrier so that stores to dio_bio->bi_status before
7483 * this and loads of dio_bio->bi_status after this are fully ordered.
7485 if (!refcount_dec_and_test(&dip
->refs
))
7488 if (bio_op(dip
->dio_bio
) == REQ_OP_WRITE
) {
7489 __endio_write_update_ordered(BTRFS_I(dip
->inode
),
7490 dip
->logical_offset
,
7492 !dip
->dio_bio
->bi_status
);
7494 unlock_extent(&BTRFS_I(dip
->inode
)->io_tree
,
7495 dip
->logical_offset
,
7496 dip
->logical_offset
+ dip
->bytes
- 1);
7499 dio_end_io(dip
->dio_bio
);
7503 static blk_status_t
submit_dio_repair_bio(struct inode
*inode
, struct bio
*bio
,
7505 unsigned long bio_flags
)
7507 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7508 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
7511 BUG_ON(bio_op(bio
) == REQ_OP_WRITE
);
7513 ret
= btrfs_bio_wq_end_io(fs_info
, bio
, BTRFS_WQ_ENDIO_DATA
);
7517 refcount_inc(&dip
->refs
);
7518 ret
= btrfs_map_bio(fs_info
, bio
, mirror_num
);
7520 refcount_dec(&dip
->refs
);
7524 static blk_status_t
btrfs_check_read_dio_bio(struct inode
*inode
,
7525 struct btrfs_io_bio
*io_bio
,
7526 const bool uptodate
)
7528 struct btrfs_fs_info
*fs_info
= BTRFS_I(inode
)->root
->fs_info
;
7529 const u32 sectorsize
= fs_info
->sectorsize
;
7530 struct extent_io_tree
*failure_tree
= &BTRFS_I(inode
)->io_failure_tree
;
7531 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
7532 const bool csum
= !(BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
);
7533 struct bio_vec bvec
;
7534 struct bvec_iter iter
;
7535 u64 start
= io_bio
->logical
;
7537 blk_status_t err
= BLK_STS_OK
;
7539 __bio_for_each_segment(bvec
, &io_bio
->bio
, iter
, io_bio
->iter
) {
7540 unsigned int i
, nr_sectors
, pgoff
;
7542 nr_sectors
= BTRFS_BYTES_TO_BLKS(fs_info
, bvec
.bv_len
);
7543 pgoff
= bvec
.bv_offset
;
7544 for (i
= 0; i
< nr_sectors
; i
++) {
7545 ASSERT(pgoff
< PAGE_SIZE
);
7547 (!csum
|| !check_data_csum(inode
, io_bio
, icsum
,
7548 bvec
.bv_page
, pgoff
,
7549 start
, sectorsize
))) {
7550 clean_io_failure(fs_info
, failure_tree
, io_tree
,
7551 start
, bvec
.bv_page
,
7552 btrfs_ino(BTRFS_I(inode
)),
7555 blk_status_t status
;
7557 status
= btrfs_submit_read_repair(inode
,
7559 start
- io_bio
->logical
,
7560 bvec
.bv_page
, pgoff
,
7562 start
+ sectorsize
- 1,
7564 submit_dio_repair_bio
);
7568 start
+= sectorsize
;
7570 pgoff
+= sectorsize
;
7576 static void __endio_write_update_ordered(struct btrfs_inode
*inode
,
7577 const u64 offset
, const u64 bytes
,
7578 const bool uptodate
)
7580 struct btrfs_fs_info
*fs_info
= inode
->root
->fs_info
;
7581 struct btrfs_ordered_extent
*ordered
= NULL
;
7582 struct btrfs_workqueue
*wq
;
7583 u64 ordered_offset
= offset
;
7584 u64 ordered_bytes
= bytes
;
7587 if (btrfs_is_free_space_inode(inode
))
7588 wq
= fs_info
->endio_freespace_worker
;
7590 wq
= fs_info
->endio_write_workers
;
7592 while (ordered_offset
< offset
+ bytes
) {
7593 last_offset
= ordered_offset
;
7594 if (btrfs_dec_test_first_ordered_pending(inode
, &ordered
,
7598 btrfs_init_work(&ordered
->work
, finish_ordered_fn
, NULL
,
7600 btrfs_queue_work(wq
, &ordered
->work
);
7603 * If btrfs_dec_test_ordered_pending does not find any ordered
7604 * extent in the range, we can exit.
7606 if (ordered_offset
== last_offset
)
7609 * Our bio might span multiple ordered extents. In this case
7610 * we keep going until we have accounted the whole dio.
7612 if (ordered_offset
< offset
+ bytes
) {
7613 ordered_bytes
= offset
+ bytes
- ordered_offset
;
7619 static blk_status_t
btrfs_submit_bio_start_direct_io(void *private_data
,
7620 struct bio
*bio
, u64 offset
)
7622 struct inode
*inode
= private_data
;
7624 return btrfs_csum_one_bio(BTRFS_I(inode
), bio
, offset
, 1);
7627 static void btrfs_end_dio_bio(struct bio
*bio
)
7629 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7630 blk_status_t err
= bio
->bi_status
;
7633 btrfs_warn(BTRFS_I(dip
->inode
)->root
->fs_info
,
7634 "direct IO failed ino %llu rw %d,%u sector %#Lx len %u err no %d",
7635 btrfs_ino(BTRFS_I(dip
->inode
)), bio_op(bio
),
7637 (unsigned long long)bio
->bi_iter
.bi_sector
,
7638 bio
->bi_iter
.bi_size
, err
);
7640 if (bio_op(bio
) == REQ_OP_READ
) {
7641 err
= btrfs_check_read_dio_bio(dip
->inode
, btrfs_io_bio(bio
),
7646 dip
->dio_bio
->bi_status
= err
;
7649 btrfs_dio_private_put(dip
);
7652 static inline blk_status_t
btrfs_submit_dio_bio(struct bio
*bio
,
7653 struct inode
*inode
, u64 file_offset
, int async_submit
)
7655 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
7656 struct btrfs_dio_private
*dip
= bio
->bi_private
;
7657 bool write
= bio_op(bio
) == REQ_OP_WRITE
;
7660 /* Check btrfs_submit_bio_hook() for rules about async submit. */
7662 async_submit
= !atomic_read(&BTRFS_I(inode
)->sync_writers
);
7665 ret
= btrfs_bio_wq_end_io(fs_info
, bio
, BTRFS_WQ_ENDIO_DATA
);
7670 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
)
7673 if (write
&& async_submit
) {
7674 ret
= btrfs_wq_submit_bio(fs_info
, bio
, 0, 0,
7676 btrfs_submit_bio_start_direct_io
);
7680 * If we aren't doing async submit, calculate the csum of the
7683 ret
= btrfs_csum_one_bio(BTRFS_I(inode
), bio
, file_offset
, 1);
7689 csum_offset
= file_offset
- dip
->logical_offset
;
7690 csum_offset
>>= inode
->i_sb
->s_blocksize_bits
;
7691 csum_offset
*= btrfs_super_csum_size(fs_info
->super_copy
);
7692 btrfs_io_bio(bio
)->csum
= dip
->csums
+ csum_offset
;
7695 ret
= btrfs_map_bio(fs_info
, bio
, 0);
7701 * If this succeeds, the btrfs_dio_private is responsible for cleaning up locked
7702 * or ordered extents whether or not we submit any bios.
7704 static struct btrfs_dio_private
*btrfs_create_dio_private(struct bio
*dio_bio
,
7705 struct inode
*inode
,
7708 const bool write
= (bio_op(dio_bio
) == REQ_OP_WRITE
);
7709 const bool csum
= !(BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
);
7711 struct btrfs_dio_private
*dip
;
7713 dip_size
= sizeof(*dip
);
7714 if (!write
&& csum
) {
7715 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
7716 const u16 csum_size
= btrfs_super_csum_size(fs_info
->super_copy
);
7719 nblocks
= dio_bio
->bi_iter
.bi_size
>> inode
->i_sb
->s_blocksize_bits
;
7720 dip_size
+= csum_size
* nblocks
;
7723 dip
= kzalloc(dip_size
, GFP_NOFS
);
7728 dip
->logical_offset
= file_offset
;
7729 dip
->bytes
= dio_bio
->bi_iter
.bi_size
;
7730 dip
->disk_bytenr
= (u64
)dio_bio
->bi_iter
.bi_sector
<< 9;
7731 dip
->dio_bio
= dio_bio
;
7732 refcount_set(&dip
->refs
, 1);
7735 struct btrfs_dio_data
*dio_data
= current
->journal_info
;
7738 * Setting range start and end to the same value means that
7739 * no cleanup will happen in btrfs_direct_IO
7741 dio_data
->unsubmitted_oe_range_end
= dip
->logical_offset
+
7743 dio_data
->unsubmitted_oe_range_start
=
7744 dio_data
->unsubmitted_oe_range_end
;
7749 static void btrfs_submit_direct(struct bio
*dio_bio
, struct inode
*inode
,
7752 const bool write
= (bio_op(dio_bio
) == REQ_OP_WRITE
);
7753 const bool csum
= !(BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
);
7754 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
7755 const bool raid56
= (btrfs_data_alloc_profile(fs_info
) &
7756 BTRFS_BLOCK_GROUP_RAID56_MASK
);
7757 struct btrfs_dio_private
*dip
;
7760 int async_submit
= 0;
7762 int clone_offset
= 0;
7765 blk_status_t status
;
7766 struct btrfs_io_geometry geom
;
7768 dip
= btrfs_create_dio_private(dio_bio
, inode
, file_offset
);
7771 unlock_extent(&BTRFS_I(inode
)->io_tree
, file_offset
,
7772 file_offset
+ dio_bio
->bi_iter
.bi_size
- 1);
7774 dio_bio
->bi_status
= BLK_STS_RESOURCE
;
7775 dio_end_io(dio_bio
);
7779 if (!write
&& csum
) {
7781 * Load the csums up front to reduce csum tree searches and
7782 * contention when submitting bios.
7784 status
= btrfs_lookup_bio_sums(inode
, dio_bio
, file_offset
,
7786 if (status
!= BLK_STS_OK
)
7790 start_sector
= dio_bio
->bi_iter
.bi_sector
;
7791 submit_len
= dio_bio
->bi_iter
.bi_size
;
7794 ret
= btrfs_get_io_geometry(fs_info
, btrfs_op(dio_bio
),
7795 start_sector
<< 9, submit_len
,
7798 status
= errno_to_blk_status(ret
);
7801 ASSERT(geom
.len
<= INT_MAX
);
7803 clone_len
= min_t(int, submit_len
, geom
.len
);
7806 * This will never fail as it's passing GPF_NOFS and
7807 * the allocation is backed by btrfs_bioset.
7809 bio
= btrfs_bio_clone_partial(dio_bio
, clone_offset
, clone_len
);
7810 bio
->bi_private
= dip
;
7811 bio
->bi_end_io
= btrfs_end_dio_bio
;
7812 btrfs_io_bio(bio
)->logical
= file_offset
;
7814 ASSERT(submit_len
>= clone_len
);
7815 submit_len
-= clone_len
;
7818 * Increase the count before we submit the bio so we know
7819 * the end IO handler won't happen before we increase the
7820 * count. Otherwise, the dip might get freed before we're
7821 * done setting it up.
7823 * We transfer the initial reference to the last bio, so we
7824 * don't need to increment the reference count for the last one.
7826 if (submit_len
> 0) {
7827 refcount_inc(&dip
->refs
);
7829 * If we are submitting more than one bio, submit them
7830 * all asynchronously. The exception is RAID 5 or 6, as
7831 * asynchronous checksums make it difficult to collect
7832 * full stripe writes.
7838 status
= btrfs_submit_dio_bio(bio
, inode
, file_offset
,
7843 refcount_dec(&dip
->refs
);
7847 clone_offset
+= clone_len
;
7848 start_sector
+= clone_len
>> 9;
7849 file_offset
+= clone_len
;
7850 } while (submit_len
> 0);
7854 dip
->dio_bio
->bi_status
= status
;
7855 btrfs_dio_private_put(dip
);
7858 static ssize_t
check_direct_IO(struct btrfs_fs_info
*fs_info
,
7859 const struct iov_iter
*iter
, loff_t offset
)
7863 unsigned int blocksize_mask
= fs_info
->sectorsize
- 1;
7864 ssize_t retval
= -EINVAL
;
7866 if (offset
& blocksize_mask
)
7869 if (iov_iter_alignment(iter
) & blocksize_mask
)
7872 /* If this is a write we don't need to check anymore */
7873 if (iov_iter_rw(iter
) != READ
|| !iter_is_iovec(iter
))
7876 * Check to make sure we don't have duplicate iov_base's in this
7877 * iovec, if so return EINVAL, otherwise we'll get csum errors
7878 * when reading back.
7880 for (seg
= 0; seg
< iter
->nr_segs
; seg
++) {
7881 for (i
= seg
+ 1; i
< iter
->nr_segs
; i
++) {
7882 if (iter
->iov
[seg
].iov_base
== iter
->iov
[i
].iov_base
)
7891 static ssize_t
btrfs_direct_IO(struct kiocb
*iocb
, struct iov_iter
*iter
)
7893 struct file
*file
= iocb
->ki_filp
;
7894 struct inode
*inode
= file
->f_mapping
->host
;
7895 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
7896 struct btrfs_dio_data dio_data
= { 0 };
7897 struct extent_changeset
*data_reserved
= NULL
;
7898 loff_t offset
= iocb
->ki_pos
;
7902 bool relock
= false;
7905 if (check_direct_IO(fs_info
, iter
, offset
))
7908 inode_dio_begin(inode
);
7911 * The generic stuff only does filemap_write_and_wait_range, which
7912 * isn't enough if we've written compressed pages to this area, so
7913 * we need to flush the dirty pages again to make absolutely sure
7914 * that any outstanding dirty pages are on disk.
7916 count
= iov_iter_count(iter
);
7917 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
7918 &BTRFS_I(inode
)->runtime_flags
))
7919 filemap_fdatawrite_range(inode
->i_mapping
, offset
,
7920 offset
+ count
- 1);
7922 if (iov_iter_rw(iter
) == WRITE
) {
7924 * If the write DIO is beyond the EOF, we need update
7925 * the isize, but it is protected by i_mutex. So we can
7926 * not unlock the i_mutex at this case.
7928 if (offset
+ count
<= inode
->i_size
) {
7929 dio_data
.overwrite
= 1;
7930 inode_unlock(inode
);
7933 ret
= btrfs_delalloc_reserve_space(BTRFS_I(inode
), &data_reserved
,
7939 * We need to know how many extents we reserved so that we can
7940 * do the accounting properly if we go over the number we
7941 * originally calculated. Abuse current->journal_info for this.
7943 dio_data
.reserve
= round_up(count
,
7944 fs_info
->sectorsize
);
7945 dio_data
.unsubmitted_oe_range_start
= (u64
)offset
;
7946 dio_data
.unsubmitted_oe_range_end
= (u64
)offset
;
7947 current
->journal_info
= &dio_data
;
7948 down_read(&BTRFS_I(inode
)->dio_sem
);
7949 } else if (test_bit(BTRFS_INODE_READDIO_NEED_LOCK
,
7950 &BTRFS_I(inode
)->runtime_flags
)) {
7951 inode_dio_end(inode
);
7952 flags
= DIO_LOCKING
| DIO_SKIP_HOLES
;
7956 ret
= __blockdev_direct_IO(iocb
, inode
,
7957 fs_info
->fs_devices
->latest_bdev
,
7958 iter
, btrfs_get_blocks_direct
, NULL
,
7959 btrfs_submit_direct
, flags
);
7960 if (iov_iter_rw(iter
) == WRITE
) {
7961 up_read(&BTRFS_I(inode
)->dio_sem
);
7962 current
->journal_info
= NULL
;
7963 if (ret
< 0 && ret
!= -EIOCBQUEUED
) {
7964 if (dio_data
.reserve
)
7965 btrfs_delalloc_release_space(BTRFS_I(inode
),
7966 data_reserved
, offset
, dio_data
.reserve
,
7969 * On error we might have left some ordered extents
7970 * without submitting corresponding bios for them, so
7971 * cleanup them up to avoid other tasks getting them
7972 * and waiting for them to complete forever.
7974 if (dio_data
.unsubmitted_oe_range_start
<
7975 dio_data
.unsubmitted_oe_range_end
)
7976 __endio_write_update_ordered(BTRFS_I(inode
),
7977 dio_data
.unsubmitted_oe_range_start
,
7978 dio_data
.unsubmitted_oe_range_end
-
7979 dio_data
.unsubmitted_oe_range_start
,
7981 } else if (ret
>= 0 && (size_t)ret
< count
)
7982 btrfs_delalloc_release_space(BTRFS_I(inode
), data_reserved
,
7983 offset
, count
- (size_t)ret
, true);
7984 btrfs_delalloc_release_extents(BTRFS_I(inode
), count
);
7988 inode_dio_end(inode
);
7992 extent_changeset_free(data_reserved
);
7996 static int btrfs_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
8001 ret
= fiemap_prep(inode
, fieinfo
, start
, &len
, 0);
8005 return extent_fiemap(inode
, fieinfo
, start
, len
);
8008 int btrfs_readpage(struct file
*file
, struct page
*page
)
8010 return extent_read_full_page(page
, btrfs_get_extent
, 0);
8013 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
8015 struct inode
*inode
= page
->mapping
->host
;
8018 if (current
->flags
& PF_MEMALLOC
) {
8019 redirty_page_for_writepage(wbc
, page
);
8025 * If we are under memory pressure we will call this directly from the
8026 * VM, we need to make sure we have the inode referenced for the ordered
8027 * extent. If not just return like we didn't do anything.
8029 if (!igrab(inode
)) {
8030 redirty_page_for_writepage(wbc
, page
);
8031 return AOP_WRITEPAGE_ACTIVATE
;
8033 ret
= extent_write_full_page(page
, wbc
);
8034 btrfs_add_delayed_iput(inode
);
8038 static int btrfs_writepages(struct address_space
*mapping
,
8039 struct writeback_control
*wbc
)
8041 return extent_writepages(mapping
, wbc
);
8044 static void btrfs_readahead(struct readahead_control
*rac
)
8046 extent_readahead(rac
);
8049 static int __btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
8051 int ret
= try_release_extent_mapping(page
, gfp_flags
);
8053 detach_page_private(page
);
8057 static int btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
8059 if (PageWriteback(page
) || PageDirty(page
))
8061 return __btrfs_releasepage(page
, gfp_flags
);
8064 #ifdef CONFIG_MIGRATION
8065 static int btrfs_migratepage(struct address_space
*mapping
,
8066 struct page
*newpage
, struct page
*page
,
8067 enum migrate_mode mode
)
8071 ret
= migrate_page_move_mapping(mapping
, newpage
, page
, 0);
8072 if (ret
!= MIGRATEPAGE_SUCCESS
)
8075 if (page_has_private(page
))
8076 attach_page_private(newpage
, detach_page_private(page
));
8078 if (PagePrivate2(page
)) {
8079 ClearPagePrivate2(page
);
8080 SetPagePrivate2(newpage
);
8083 if (mode
!= MIGRATE_SYNC_NO_COPY
)
8084 migrate_page_copy(newpage
, page
);
8086 migrate_page_states(newpage
, page
);
8087 return MIGRATEPAGE_SUCCESS
;
8091 static void btrfs_invalidatepage(struct page
*page
, unsigned int offset
,
8092 unsigned int length
)
8094 struct inode
*inode
= page
->mapping
->host
;
8095 struct extent_io_tree
*tree
;
8096 struct btrfs_ordered_extent
*ordered
;
8097 struct extent_state
*cached_state
= NULL
;
8098 u64 page_start
= page_offset(page
);
8099 u64 page_end
= page_start
+ PAGE_SIZE
- 1;
8102 int inode_evicting
= inode
->i_state
& I_FREEING
;
8105 * we have the page locked, so new writeback can't start,
8106 * and the dirty bit won't be cleared while we are here.
8108 * Wait for IO on this page so that we can safely clear
8109 * the PagePrivate2 bit and do ordered accounting
8111 wait_on_page_writeback(page
);
8113 tree
= &BTRFS_I(inode
)->io_tree
;
8115 btrfs_releasepage(page
, GFP_NOFS
);
8119 if (!inode_evicting
)
8120 lock_extent_bits(tree
, page_start
, page_end
, &cached_state
);
8123 ordered
= btrfs_lookup_ordered_range(BTRFS_I(inode
), start
,
8124 page_end
- start
+ 1);
8127 ordered
->file_offset
+ ordered
->num_bytes
- 1);
8129 * IO on this page will never be started, so we need
8130 * to account for any ordered extents now
8132 if (!inode_evicting
)
8133 clear_extent_bit(tree
, start
, end
,
8134 EXTENT_DELALLOC
| EXTENT_DELALLOC_NEW
|
8135 EXTENT_LOCKED
| EXTENT_DO_ACCOUNTING
|
8136 EXTENT_DEFRAG
, 1, 0, &cached_state
);
8138 * whoever cleared the private bit is responsible
8139 * for the finish_ordered_io
8141 if (TestClearPagePrivate2(page
)) {
8142 struct btrfs_ordered_inode_tree
*tree
;
8145 tree
= &BTRFS_I(inode
)->ordered_tree
;
8147 spin_lock_irq(&tree
->lock
);
8148 set_bit(BTRFS_ORDERED_TRUNCATED
, &ordered
->flags
);
8149 new_len
= start
- ordered
->file_offset
;
8150 if (new_len
< ordered
->truncated_len
)
8151 ordered
->truncated_len
= new_len
;
8152 spin_unlock_irq(&tree
->lock
);
8154 if (btrfs_dec_test_ordered_pending(inode
, &ordered
,
8156 end
- start
+ 1, 1))
8157 btrfs_finish_ordered_io(ordered
);
8159 btrfs_put_ordered_extent(ordered
);
8160 if (!inode_evicting
) {
8161 cached_state
= NULL
;
8162 lock_extent_bits(tree
, start
, end
,
8167 if (start
< page_end
)
8172 * Qgroup reserved space handler
8173 * Page here will be either
8174 * 1) Already written to disk or ordered extent already submitted
8175 * Then its QGROUP_RESERVED bit in io_tree is already cleaned.
8176 * Qgroup will be handled by its qgroup_record then.
8177 * btrfs_qgroup_free_data() call will do nothing here.
8179 * 2) Not written to disk yet
8180 * Then btrfs_qgroup_free_data() call will clear the QGROUP_RESERVED
8181 * bit of its io_tree, and free the qgroup reserved data space.
8182 * Since the IO will never happen for this page.
8184 btrfs_qgroup_free_data(BTRFS_I(inode
), NULL
, page_start
, PAGE_SIZE
);
8185 if (!inode_evicting
) {
8186 clear_extent_bit(tree
, page_start
, page_end
, EXTENT_LOCKED
|
8187 EXTENT_DELALLOC
| EXTENT_DELALLOC_NEW
|
8188 EXTENT_DO_ACCOUNTING
| EXTENT_DEFRAG
, 1, 1,
8191 __btrfs_releasepage(page
, GFP_NOFS
);
8194 ClearPageChecked(page
);
8195 detach_page_private(page
);
8199 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
8200 * called from a page fault handler when a page is first dirtied. Hence we must
8201 * be careful to check for EOF conditions here. We set the page up correctly
8202 * for a written page which means we get ENOSPC checking when writing into
8203 * holes and correct delalloc and unwritten extent mapping on filesystems that
8204 * support these features.
8206 * We are not allowed to take the i_mutex here so we have to play games to
8207 * protect against truncate races as the page could now be beyond EOF. Because
8208 * truncate_setsize() writes the inode size before removing pages, once we have
8209 * the page lock we can determine safely if the page is beyond EOF. If it is not
8210 * beyond EOF, then the page is guaranteed safe against truncation until we
8213 vm_fault_t
btrfs_page_mkwrite(struct vm_fault
*vmf
)
8215 struct page
*page
= vmf
->page
;
8216 struct inode
*inode
= file_inode(vmf
->vma
->vm_file
);
8217 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
8218 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
8219 struct btrfs_ordered_extent
*ordered
;
8220 struct extent_state
*cached_state
= NULL
;
8221 struct extent_changeset
*data_reserved
= NULL
;
8223 unsigned long zero_start
;
8233 reserved_space
= PAGE_SIZE
;
8235 sb_start_pagefault(inode
->i_sb
);
8236 page_start
= page_offset(page
);
8237 page_end
= page_start
+ PAGE_SIZE
- 1;
8241 * Reserving delalloc space after obtaining the page lock can lead to
8242 * deadlock. For example, if a dirty page is locked by this function
8243 * and the call to btrfs_delalloc_reserve_space() ends up triggering
8244 * dirty page write out, then the btrfs_writepage() function could
8245 * end up waiting indefinitely to get a lock on the page currently
8246 * being processed by btrfs_page_mkwrite() function.
8248 ret2
= btrfs_delalloc_reserve_space(BTRFS_I(inode
), &data_reserved
,
8249 page_start
, reserved_space
);
8251 ret2
= file_update_time(vmf
->vma
->vm_file
);
8255 ret
= vmf_error(ret2
);
8261 ret
= VM_FAULT_NOPAGE
; /* make the VM retry the fault */
8264 size
= i_size_read(inode
);
8266 if ((page
->mapping
!= inode
->i_mapping
) ||
8267 (page_start
>= size
)) {
8268 /* page got truncated out from underneath us */
8271 wait_on_page_writeback(page
);
8273 lock_extent_bits(io_tree
, page_start
, page_end
, &cached_state
);
8274 set_page_extent_mapped(page
);
8277 * we can't set the delalloc bits if there are pending ordered
8278 * extents. Drop our locks and wait for them to finish
8280 ordered
= btrfs_lookup_ordered_range(BTRFS_I(inode
), page_start
,
8283 unlock_extent_cached(io_tree
, page_start
, page_end
,
8286 btrfs_start_ordered_extent(inode
, ordered
, 1);
8287 btrfs_put_ordered_extent(ordered
);
8291 if (page
->index
== ((size
- 1) >> PAGE_SHIFT
)) {
8292 reserved_space
= round_up(size
- page_start
,
8293 fs_info
->sectorsize
);
8294 if (reserved_space
< PAGE_SIZE
) {
8295 end
= page_start
+ reserved_space
- 1;
8296 btrfs_delalloc_release_space(BTRFS_I(inode
),
8297 data_reserved
, page_start
,
8298 PAGE_SIZE
- reserved_space
, true);
8303 * page_mkwrite gets called when the page is firstly dirtied after it's
8304 * faulted in, but write(2) could also dirty a page and set delalloc
8305 * bits, thus in this case for space account reason, we still need to
8306 * clear any delalloc bits within this page range since we have to
8307 * reserve data&meta space before lock_page() (see above comments).
8309 clear_extent_bit(&BTRFS_I(inode
)->io_tree
, page_start
, end
,
8310 EXTENT_DELALLOC
| EXTENT_DO_ACCOUNTING
|
8311 EXTENT_DEFRAG
, 0, 0, &cached_state
);
8313 ret2
= btrfs_set_extent_delalloc(BTRFS_I(inode
), page_start
, end
, 0,
8316 unlock_extent_cached(io_tree
, page_start
, page_end
,
8318 ret
= VM_FAULT_SIGBUS
;
8322 /* page is wholly or partially inside EOF */
8323 if (page_start
+ PAGE_SIZE
> size
)
8324 zero_start
= offset_in_page(size
);
8326 zero_start
= PAGE_SIZE
;
8328 if (zero_start
!= PAGE_SIZE
) {
8330 memset(kaddr
+ zero_start
, 0, PAGE_SIZE
- zero_start
);
8331 flush_dcache_page(page
);
8334 ClearPageChecked(page
);
8335 set_page_dirty(page
);
8336 SetPageUptodate(page
);
8338 BTRFS_I(inode
)->last_trans
= fs_info
->generation
;
8339 BTRFS_I(inode
)->last_sub_trans
= BTRFS_I(inode
)->root
->log_transid
;
8340 BTRFS_I(inode
)->last_log_commit
= BTRFS_I(inode
)->root
->last_log_commit
;
8342 unlock_extent_cached(io_tree
, page_start
, page_end
, &cached_state
);
8344 btrfs_delalloc_release_extents(BTRFS_I(inode
), PAGE_SIZE
);
8345 sb_end_pagefault(inode
->i_sb
);
8346 extent_changeset_free(data_reserved
);
8347 return VM_FAULT_LOCKED
;
8352 btrfs_delalloc_release_extents(BTRFS_I(inode
), PAGE_SIZE
);
8353 btrfs_delalloc_release_space(BTRFS_I(inode
), data_reserved
, page_start
,
8354 reserved_space
, (ret
!= 0));
8356 sb_end_pagefault(inode
->i_sb
);
8357 extent_changeset_free(data_reserved
);
8361 static int btrfs_truncate(struct inode
*inode
, bool skip_writeback
)
8363 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
8364 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8365 struct btrfs_block_rsv
*rsv
;
8367 struct btrfs_trans_handle
*trans
;
8368 u64 mask
= fs_info
->sectorsize
- 1;
8369 u64 min_size
= btrfs_calc_metadata_size(fs_info
, 1);
8371 if (!skip_writeback
) {
8372 ret
= btrfs_wait_ordered_range(inode
, inode
->i_size
& (~mask
),
8379 * Yes ladies and gentlemen, this is indeed ugly. We have a couple of
8380 * things going on here:
8382 * 1) We need to reserve space to update our inode.
8384 * 2) We need to have something to cache all the space that is going to
8385 * be free'd up by the truncate operation, but also have some slack
8386 * space reserved in case it uses space during the truncate (thank you
8387 * very much snapshotting).
8389 * And we need these to be separate. The fact is we can use a lot of
8390 * space doing the truncate, and we have no earthly idea how much space
8391 * we will use, so we need the truncate reservation to be separate so it
8392 * doesn't end up using space reserved for updating the inode. We also
8393 * need to be able to stop the transaction and start a new one, which
8394 * means we need to be able to update the inode several times, and we
8395 * have no idea of knowing how many times that will be, so we can't just
8396 * reserve 1 item for the entirety of the operation, so that has to be
8397 * done separately as well.
8399 * So that leaves us with
8401 * 1) rsv - for the truncate reservation, which we will steal from the
8402 * transaction reservation.
8403 * 2) fs_info->trans_block_rsv - this will have 1 items worth left for
8404 * updating the inode.
8406 rsv
= btrfs_alloc_block_rsv(fs_info
, BTRFS_BLOCK_RSV_TEMP
);
8409 rsv
->size
= min_size
;
8413 * 1 for the truncate slack space
8414 * 1 for updating the inode.
8416 trans
= btrfs_start_transaction(root
, 2);
8417 if (IS_ERR(trans
)) {
8418 ret
= PTR_ERR(trans
);
8422 /* Migrate the slack space for the truncate to our reserve */
8423 ret
= btrfs_block_rsv_migrate(&fs_info
->trans_block_rsv
, rsv
,
8428 * So if we truncate and then write and fsync we normally would just
8429 * write the extents that changed, which is a problem if we need to
8430 * first truncate that entire inode. So set this flag so we write out
8431 * all of the extents in the inode to the sync log so we're completely
8434 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
, &BTRFS_I(inode
)->runtime_flags
);
8435 trans
->block_rsv
= rsv
;
8438 ret
= btrfs_truncate_inode_items(trans
, root
, inode
,
8440 BTRFS_EXTENT_DATA_KEY
);
8441 trans
->block_rsv
= &fs_info
->trans_block_rsv
;
8442 if (ret
!= -ENOSPC
&& ret
!= -EAGAIN
)
8445 ret
= btrfs_update_inode(trans
, root
, inode
);
8449 btrfs_end_transaction(trans
);
8450 btrfs_btree_balance_dirty(fs_info
);
8452 trans
= btrfs_start_transaction(root
, 2);
8453 if (IS_ERR(trans
)) {
8454 ret
= PTR_ERR(trans
);
8459 btrfs_block_rsv_release(fs_info
, rsv
, -1, NULL
);
8460 ret
= btrfs_block_rsv_migrate(&fs_info
->trans_block_rsv
,
8461 rsv
, min_size
, false);
8462 BUG_ON(ret
); /* shouldn't happen */
8463 trans
->block_rsv
= rsv
;
8467 * We can't call btrfs_truncate_block inside a trans handle as we could
8468 * deadlock with freeze, if we got NEED_TRUNCATE_BLOCK then we know
8469 * we've truncated everything except the last little bit, and can do
8470 * btrfs_truncate_block and then update the disk_i_size.
8472 if (ret
== NEED_TRUNCATE_BLOCK
) {
8473 btrfs_end_transaction(trans
);
8474 btrfs_btree_balance_dirty(fs_info
);
8476 ret
= btrfs_truncate_block(inode
, inode
->i_size
, 0, 0);
8479 trans
= btrfs_start_transaction(root
, 1);
8480 if (IS_ERR(trans
)) {
8481 ret
= PTR_ERR(trans
);
8484 btrfs_inode_safe_disk_i_size_write(inode
, 0);
8490 trans
->block_rsv
= &fs_info
->trans_block_rsv
;
8491 ret2
= btrfs_update_inode(trans
, root
, inode
);
8495 ret2
= btrfs_end_transaction(trans
);
8498 btrfs_btree_balance_dirty(fs_info
);
8501 btrfs_free_block_rsv(fs_info
, rsv
);
8507 * create a new subvolume directory/inode (helper for the ioctl).
8509 int btrfs_create_subvol_root(struct btrfs_trans_handle
*trans
,
8510 struct btrfs_root
*new_root
,
8511 struct btrfs_root
*parent_root
,
8514 struct inode
*inode
;
8518 inode
= btrfs_new_inode(trans
, new_root
, NULL
, "..", 2,
8519 new_dirid
, new_dirid
,
8520 S_IFDIR
| (~current_umask() & S_IRWXUGO
),
8523 return PTR_ERR(inode
);
8524 inode
->i_op
= &btrfs_dir_inode_operations
;
8525 inode
->i_fop
= &btrfs_dir_file_operations
;
8527 set_nlink(inode
, 1);
8528 btrfs_i_size_write(BTRFS_I(inode
), 0);
8529 unlock_new_inode(inode
);
8531 err
= btrfs_subvol_inherit_props(trans
, new_root
, parent_root
);
8533 btrfs_err(new_root
->fs_info
,
8534 "error inheriting subvolume %llu properties: %d",
8535 new_root
->root_key
.objectid
, err
);
8537 err
= btrfs_update_inode(trans
, new_root
, inode
);
8543 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
8545 struct btrfs_fs_info
*fs_info
= btrfs_sb(sb
);
8546 struct btrfs_inode
*ei
;
8547 struct inode
*inode
;
8549 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_KERNEL
);
8556 ei
->last_sub_trans
= 0;
8557 ei
->logged_trans
= 0;
8558 ei
->delalloc_bytes
= 0;
8559 ei
->new_delalloc_bytes
= 0;
8560 ei
->defrag_bytes
= 0;
8561 ei
->disk_i_size
= 0;
8564 ei
->index_cnt
= (u64
)-1;
8566 ei
->last_unlink_trans
= 0;
8567 ei
->last_reflink_trans
= 0;
8568 ei
->last_log_commit
= 0;
8570 spin_lock_init(&ei
->lock
);
8571 ei
->outstanding_extents
= 0;
8572 if (sb
->s_magic
!= BTRFS_TEST_MAGIC
)
8573 btrfs_init_metadata_block_rsv(fs_info
, &ei
->block_rsv
,
8574 BTRFS_BLOCK_RSV_DELALLOC
);
8575 ei
->runtime_flags
= 0;
8576 ei
->prop_compress
= BTRFS_COMPRESS_NONE
;
8577 ei
->defrag_compress
= BTRFS_COMPRESS_NONE
;
8579 ei
->delayed_node
= NULL
;
8581 ei
->i_otime
.tv_sec
= 0;
8582 ei
->i_otime
.tv_nsec
= 0;
8584 inode
= &ei
->vfs_inode
;
8585 extent_map_tree_init(&ei
->extent_tree
);
8586 extent_io_tree_init(fs_info
, &ei
->io_tree
, IO_TREE_INODE_IO
, inode
);
8587 extent_io_tree_init(fs_info
, &ei
->io_failure_tree
,
8588 IO_TREE_INODE_IO_FAILURE
, inode
);
8589 extent_io_tree_init(fs_info
, &ei
->file_extent_tree
,
8590 IO_TREE_INODE_FILE_EXTENT
, inode
);
8591 ei
->io_tree
.track_uptodate
= true;
8592 ei
->io_failure_tree
.track_uptodate
= true;
8593 atomic_set(&ei
->sync_writers
, 0);
8594 mutex_init(&ei
->log_mutex
);
8595 btrfs_ordered_inode_tree_init(&ei
->ordered_tree
);
8596 INIT_LIST_HEAD(&ei
->delalloc_inodes
);
8597 INIT_LIST_HEAD(&ei
->delayed_iput
);
8598 RB_CLEAR_NODE(&ei
->rb_node
);
8599 init_rwsem(&ei
->dio_sem
);
8604 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
8605 void btrfs_test_destroy_inode(struct inode
*inode
)
8607 btrfs_drop_extent_cache(BTRFS_I(inode
), 0, (u64
)-1, 0);
8608 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
8612 void btrfs_free_inode(struct inode
*inode
)
8614 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
8617 void btrfs_destroy_inode(struct inode
*inode
)
8619 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
8620 struct btrfs_ordered_extent
*ordered
;
8621 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8623 WARN_ON(!hlist_empty(&inode
->i_dentry
));
8624 WARN_ON(inode
->i_data
.nrpages
);
8625 WARN_ON(BTRFS_I(inode
)->block_rsv
.reserved
);
8626 WARN_ON(BTRFS_I(inode
)->block_rsv
.size
);
8627 WARN_ON(BTRFS_I(inode
)->outstanding_extents
);
8628 WARN_ON(BTRFS_I(inode
)->delalloc_bytes
);
8629 WARN_ON(BTRFS_I(inode
)->new_delalloc_bytes
);
8630 WARN_ON(BTRFS_I(inode
)->csum_bytes
);
8631 WARN_ON(BTRFS_I(inode
)->defrag_bytes
);
8634 * This can happen where we create an inode, but somebody else also
8635 * created the same inode and we need to destroy the one we already
8642 ordered
= btrfs_lookup_first_ordered_extent(inode
, (u64
)-1);
8647 "found ordered extent %llu %llu on inode cleanup",
8648 ordered
->file_offset
, ordered
->num_bytes
);
8649 btrfs_remove_ordered_extent(inode
, ordered
);
8650 btrfs_put_ordered_extent(ordered
);
8651 btrfs_put_ordered_extent(ordered
);
8654 btrfs_qgroup_check_reserved_leak(BTRFS_I(inode
));
8655 inode_tree_del(inode
);
8656 btrfs_drop_extent_cache(BTRFS_I(inode
), 0, (u64
)-1, 0);
8657 btrfs_inode_clear_file_extent_range(BTRFS_I(inode
), 0, (u64
)-1);
8658 btrfs_put_root(BTRFS_I(inode
)->root
);
8661 int btrfs_drop_inode(struct inode
*inode
)
8663 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
8668 /* the snap/subvol tree is on deleting */
8669 if (btrfs_root_refs(&root
->root_item
) == 0)
8672 return generic_drop_inode(inode
);
8675 static void init_once(void *foo
)
8677 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
8679 inode_init_once(&ei
->vfs_inode
);
8682 void __cold
btrfs_destroy_cachep(void)
8685 * Make sure all delayed rcu free inodes are flushed before we
8689 kmem_cache_destroy(btrfs_inode_cachep
);
8690 kmem_cache_destroy(btrfs_trans_handle_cachep
);
8691 kmem_cache_destroy(btrfs_path_cachep
);
8692 kmem_cache_destroy(btrfs_free_space_cachep
);
8693 kmem_cache_destroy(btrfs_free_space_bitmap_cachep
);
8696 int __init
btrfs_init_cachep(void)
8698 btrfs_inode_cachep
= kmem_cache_create("btrfs_inode",
8699 sizeof(struct btrfs_inode
), 0,
8700 SLAB_RECLAIM_ACCOUNT
| SLAB_MEM_SPREAD
| SLAB_ACCOUNT
,
8702 if (!btrfs_inode_cachep
)
8705 btrfs_trans_handle_cachep
= kmem_cache_create("btrfs_trans_handle",
8706 sizeof(struct btrfs_trans_handle
), 0,
8707 SLAB_TEMPORARY
| SLAB_MEM_SPREAD
, NULL
);
8708 if (!btrfs_trans_handle_cachep
)
8711 btrfs_path_cachep
= kmem_cache_create("btrfs_path",
8712 sizeof(struct btrfs_path
), 0,
8713 SLAB_MEM_SPREAD
, NULL
);
8714 if (!btrfs_path_cachep
)
8717 btrfs_free_space_cachep
= kmem_cache_create("btrfs_free_space",
8718 sizeof(struct btrfs_free_space
), 0,
8719 SLAB_MEM_SPREAD
, NULL
);
8720 if (!btrfs_free_space_cachep
)
8723 btrfs_free_space_bitmap_cachep
= kmem_cache_create("btrfs_free_space_bitmap",
8724 PAGE_SIZE
, PAGE_SIZE
,
8725 SLAB_RED_ZONE
, NULL
);
8726 if (!btrfs_free_space_bitmap_cachep
)
8731 btrfs_destroy_cachep();
8735 static int btrfs_getattr(const struct path
*path
, struct kstat
*stat
,
8736 u32 request_mask
, unsigned int flags
)
8739 struct inode
*inode
= d_inode(path
->dentry
);
8740 u32 blocksize
= inode
->i_sb
->s_blocksize
;
8741 u32 bi_flags
= BTRFS_I(inode
)->flags
;
8743 stat
->result_mask
|= STATX_BTIME
;
8744 stat
->btime
.tv_sec
= BTRFS_I(inode
)->i_otime
.tv_sec
;
8745 stat
->btime
.tv_nsec
= BTRFS_I(inode
)->i_otime
.tv_nsec
;
8746 if (bi_flags
& BTRFS_INODE_APPEND
)
8747 stat
->attributes
|= STATX_ATTR_APPEND
;
8748 if (bi_flags
& BTRFS_INODE_COMPRESS
)
8749 stat
->attributes
|= STATX_ATTR_COMPRESSED
;
8750 if (bi_flags
& BTRFS_INODE_IMMUTABLE
)
8751 stat
->attributes
|= STATX_ATTR_IMMUTABLE
;
8752 if (bi_flags
& BTRFS_INODE_NODUMP
)
8753 stat
->attributes
|= STATX_ATTR_NODUMP
;
8755 stat
->attributes_mask
|= (STATX_ATTR_APPEND
|
8756 STATX_ATTR_COMPRESSED
|
8757 STATX_ATTR_IMMUTABLE
|
8760 generic_fillattr(inode
, stat
);
8761 stat
->dev
= BTRFS_I(inode
)->root
->anon_dev
;
8763 spin_lock(&BTRFS_I(inode
)->lock
);
8764 delalloc_bytes
= BTRFS_I(inode
)->new_delalloc_bytes
;
8765 spin_unlock(&BTRFS_I(inode
)->lock
);
8766 stat
->blocks
= (ALIGN(inode_get_bytes(inode
), blocksize
) +
8767 ALIGN(delalloc_bytes
, blocksize
)) >> 9;
8771 static int btrfs_rename_exchange(struct inode
*old_dir
,
8772 struct dentry
*old_dentry
,
8773 struct inode
*new_dir
,
8774 struct dentry
*new_dentry
)
8776 struct btrfs_fs_info
*fs_info
= btrfs_sb(old_dir
->i_sb
);
8777 struct btrfs_trans_handle
*trans
;
8778 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
8779 struct btrfs_root
*dest
= BTRFS_I(new_dir
)->root
;
8780 struct inode
*new_inode
= new_dentry
->d_inode
;
8781 struct inode
*old_inode
= old_dentry
->d_inode
;
8782 struct timespec64 ctime
= current_time(old_inode
);
8783 struct dentry
*parent
;
8784 u64 old_ino
= btrfs_ino(BTRFS_I(old_inode
));
8785 u64 new_ino
= btrfs_ino(BTRFS_I(new_inode
));
8789 bool root_log_pinned
= false;
8790 bool dest_log_pinned
= false;
8791 struct btrfs_log_ctx ctx_root
;
8792 struct btrfs_log_ctx ctx_dest
;
8793 bool sync_log_root
= false;
8794 bool sync_log_dest
= false;
8795 bool commit_transaction
= false;
8797 /* we only allow rename subvolume link between subvolumes */
8798 if (old_ino
!= BTRFS_FIRST_FREE_OBJECTID
&& root
!= dest
)
8801 btrfs_init_log_ctx(&ctx_root
, old_inode
);
8802 btrfs_init_log_ctx(&ctx_dest
, new_inode
);
8804 /* close the race window with snapshot create/destroy ioctl */
8805 if (old_ino
== BTRFS_FIRST_FREE_OBJECTID
||
8806 new_ino
== BTRFS_FIRST_FREE_OBJECTID
)
8807 down_read(&fs_info
->subvol_sem
);
8810 * We want to reserve the absolute worst case amount of items. So if
8811 * both inodes are subvols and we need to unlink them then that would
8812 * require 4 item modifications, but if they are both normal inodes it
8813 * would require 5 item modifications, so we'll assume their normal
8814 * inodes. So 5 * 2 is 10, plus 2 for the new links, so 12 total items
8815 * should cover the worst case number of items we'll modify.
8817 trans
= btrfs_start_transaction(root
, 12);
8818 if (IS_ERR(trans
)) {
8819 ret
= PTR_ERR(trans
);
8824 btrfs_record_root_in_trans(trans
, dest
);
8827 * We need to find a free sequence number both in the source and
8828 * in the destination directory for the exchange.
8830 ret
= btrfs_set_inode_index(BTRFS_I(new_dir
), &old_idx
);
8833 ret
= btrfs_set_inode_index(BTRFS_I(old_dir
), &new_idx
);
8837 BTRFS_I(old_inode
)->dir_index
= 0ULL;
8838 BTRFS_I(new_inode
)->dir_index
= 0ULL;
8840 /* Reference for the source. */
8841 if (old_ino
== BTRFS_FIRST_FREE_OBJECTID
) {
8842 /* force full log commit if subvolume involved. */
8843 btrfs_set_log_full_commit(trans
);
8845 btrfs_pin_log_trans(root
);
8846 root_log_pinned
= true;
8847 ret
= btrfs_insert_inode_ref(trans
, dest
,
8848 new_dentry
->d_name
.name
,
8849 new_dentry
->d_name
.len
,
8851 btrfs_ino(BTRFS_I(new_dir
)),
8857 /* And now for the dest. */
8858 if (new_ino
== BTRFS_FIRST_FREE_OBJECTID
) {
8859 /* force full log commit if subvolume involved. */
8860 btrfs_set_log_full_commit(trans
);
8862 btrfs_pin_log_trans(dest
);
8863 dest_log_pinned
= true;
8864 ret
= btrfs_insert_inode_ref(trans
, root
,
8865 old_dentry
->d_name
.name
,
8866 old_dentry
->d_name
.len
,
8868 btrfs_ino(BTRFS_I(old_dir
)),
8874 /* Update inode version and ctime/mtime. */
8875 inode_inc_iversion(old_dir
);
8876 inode_inc_iversion(new_dir
);
8877 inode_inc_iversion(old_inode
);
8878 inode_inc_iversion(new_inode
);
8879 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
8880 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
8881 old_inode
->i_ctime
= ctime
;
8882 new_inode
->i_ctime
= ctime
;
8884 if (old_dentry
->d_parent
!= new_dentry
->d_parent
) {
8885 btrfs_record_unlink_dir(trans
, BTRFS_I(old_dir
),
8886 BTRFS_I(old_inode
), 1);
8887 btrfs_record_unlink_dir(trans
, BTRFS_I(new_dir
),
8888 BTRFS_I(new_inode
), 1);
8891 /* src is a subvolume */
8892 if (old_ino
== BTRFS_FIRST_FREE_OBJECTID
) {
8893 ret
= btrfs_unlink_subvol(trans
, old_dir
, old_dentry
);
8894 } else { /* src is an inode */
8895 ret
= __btrfs_unlink_inode(trans
, root
, BTRFS_I(old_dir
),
8896 BTRFS_I(old_dentry
->d_inode
),
8897 old_dentry
->d_name
.name
,
8898 old_dentry
->d_name
.len
);
8900 ret
= btrfs_update_inode(trans
, root
, old_inode
);
8903 btrfs_abort_transaction(trans
, ret
);
8907 /* dest is a subvolume */
8908 if (new_ino
== BTRFS_FIRST_FREE_OBJECTID
) {
8909 ret
= btrfs_unlink_subvol(trans
, new_dir
, new_dentry
);
8910 } else { /* dest is an inode */
8911 ret
= __btrfs_unlink_inode(trans
, dest
, BTRFS_I(new_dir
),
8912 BTRFS_I(new_dentry
->d_inode
),
8913 new_dentry
->d_name
.name
,
8914 new_dentry
->d_name
.len
);
8916 ret
= btrfs_update_inode(trans
, dest
, new_inode
);
8919 btrfs_abort_transaction(trans
, ret
);
8923 ret
= btrfs_add_link(trans
, BTRFS_I(new_dir
), BTRFS_I(old_inode
),
8924 new_dentry
->d_name
.name
,
8925 new_dentry
->d_name
.len
, 0, old_idx
);
8927 btrfs_abort_transaction(trans
, ret
);
8931 ret
= btrfs_add_link(trans
, BTRFS_I(old_dir
), BTRFS_I(new_inode
),
8932 old_dentry
->d_name
.name
,
8933 old_dentry
->d_name
.len
, 0, new_idx
);
8935 btrfs_abort_transaction(trans
, ret
);
8939 if (old_inode
->i_nlink
== 1)
8940 BTRFS_I(old_inode
)->dir_index
= old_idx
;
8941 if (new_inode
->i_nlink
== 1)
8942 BTRFS_I(new_inode
)->dir_index
= new_idx
;
8944 if (root_log_pinned
) {
8945 parent
= new_dentry
->d_parent
;
8946 ret
= btrfs_log_new_name(trans
, BTRFS_I(old_inode
),
8947 BTRFS_I(old_dir
), parent
,
8949 if (ret
== BTRFS_NEED_LOG_SYNC
)
8950 sync_log_root
= true;
8951 else if (ret
== BTRFS_NEED_TRANS_COMMIT
)
8952 commit_transaction
= true;
8954 btrfs_end_log_trans(root
);
8955 root_log_pinned
= false;
8957 if (dest_log_pinned
) {
8958 if (!commit_transaction
) {
8959 parent
= old_dentry
->d_parent
;
8960 ret
= btrfs_log_new_name(trans
, BTRFS_I(new_inode
),
8961 BTRFS_I(new_dir
), parent
,
8963 if (ret
== BTRFS_NEED_LOG_SYNC
)
8964 sync_log_dest
= true;
8965 else if (ret
== BTRFS_NEED_TRANS_COMMIT
)
8966 commit_transaction
= true;
8969 btrfs_end_log_trans(dest
);
8970 dest_log_pinned
= false;
8974 * If we have pinned a log and an error happened, we unpin tasks
8975 * trying to sync the log and force them to fallback to a transaction
8976 * commit if the log currently contains any of the inodes involved in
8977 * this rename operation (to ensure we do not persist a log with an
8978 * inconsistent state for any of these inodes or leading to any
8979 * inconsistencies when replayed). If the transaction was aborted, the
8980 * abortion reason is propagated to userspace when attempting to commit
8981 * the transaction. If the log does not contain any of these inodes, we
8982 * allow the tasks to sync it.
8984 if (ret
&& (root_log_pinned
|| dest_log_pinned
)) {
8985 if (btrfs_inode_in_log(BTRFS_I(old_dir
), fs_info
->generation
) ||
8986 btrfs_inode_in_log(BTRFS_I(new_dir
), fs_info
->generation
) ||
8987 btrfs_inode_in_log(BTRFS_I(old_inode
), fs_info
->generation
) ||
8989 btrfs_inode_in_log(BTRFS_I(new_inode
), fs_info
->generation
)))
8990 btrfs_set_log_full_commit(trans
);
8992 if (root_log_pinned
) {
8993 btrfs_end_log_trans(root
);
8994 root_log_pinned
= false;
8996 if (dest_log_pinned
) {
8997 btrfs_end_log_trans(dest
);
8998 dest_log_pinned
= false;
9001 if (!ret
&& sync_log_root
&& !commit_transaction
) {
9002 ret
= btrfs_sync_log(trans
, BTRFS_I(old_inode
)->root
,
9005 commit_transaction
= true;
9007 if (!ret
&& sync_log_dest
&& !commit_transaction
) {
9008 ret
= btrfs_sync_log(trans
, BTRFS_I(new_inode
)->root
,
9011 commit_transaction
= true;
9013 if (commit_transaction
) {
9015 * We may have set commit_transaction when logging the new name
9016 * in the destination root, in which case we left the source
9017 * root context in the list of log contextes. So make sure we
9018 * remove it to avoid invalid memory accesses, since the context
9019 * was allocated in our stack frame.
9021 if (sync_log_root
) {
9022 mutex_lock(&root
->log_mutex
);
9023 list_del_init(&ctx_root
.list
);
9024 mutex_unlock(&root
->log_mutex
);
9026 ret
= btrfs_commit_transaction(trans
);
9030 ret2
= btrfs_end_transaction(trans
);
9031 ret
= ret
? ret
: ret2
;
9034 if (new_ino
== BTRFS_FIRST_FREE_OBJECTID
||
9035 old_ino
== BTRFS_FIRST_FREE_OBJECTID
)
9036 up_read(&fs_info
->subvol_sem
);
9038 ASSERT(list_empty(&ctx_root
.list
));
9039 ASSERT(list_empty(&ctx_dest
.list
));
9044 static int btrfs_whiteout_for_rename(struct btrfs_trans_handle
*trans
,
9045 struct btrfs_root
*root
,
9047 struct dentry
*dentry
)
9050 struct inode
*inode
;
9054 ret
= btrfs_find_free_ino(root
, &objectid
);
9058 inode
= btrfs_new_inode(trans
, root
, dir
,
9059 dentry
->d_name
.name
,
9061 btrfs_ino(BTRFS_I(dir
)),
9063 S_IFCHR
| WHITEOUT_MODE
,
9066 if (IS_ERR(inode
)) {
9067 ret
= PTR_ERR(inode
);
9071 inode
->i_op
= &btrfs_special_inode_operations
;
9072 init_special_inode(inode
, inode
->i_mode
,
9075 ret
= btrfs_init_inode_security(trans
, inode
, dir
,
9080 ret
= btrfs_add_nondir(trans
, BTRFS_I(dir
), dentry
,
9081 BTRFS_I(inode
), 0, index
);
9085 ret
= btrfs_update_inode(trans
, root
, inode
);
9087 unlock_new_inode(inode
);
9089 inode_dec_link_count(inode
);
9095 static int btrfs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
9096 struct inode
*new_dir
, struct dentry
*new_dentry
,
9099 struct btrfs_fs_info
*fs_info
= btrfs_sb(old_dir
->i_sb
);
9100 struct btrfs_trans_handle
*trans
;
9101 unsigned int trans_num_items
;
9102 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
9103 struct btrfs_root
*dest
= BTRFS_I(new_dir
)->root
;
9104 struct inode
*new_inode
= d_inode(new_dentry
);
9105 struct inode
*old_inode
= d_inode(old_dentry
);
9108 u64 old_ino
= btrfs_ino(BTRFS_I(old_inode
));
9109 bool log_pinned
= false;
9110 struct btrfs_log_ctx ctx
;
9111 bool sync_log
= false;
9112 bool commit_transaction
= false;
9114 if (btrfs_ino(BTRFS_I(new_dir
)) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)
9117 /* we only allow rename subvolume link between subvolumes */
9118 if (old_ino
!= BTRFS_FIRST_FREE_OBJECTID
&& root
!= dest
)
9121 if (old_ino
== BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
||
9122 (new_inode
&& btrfs_ino(BTRFS_I(new_inode
)) == BTRFS_FIRST_FREE_OBJECTID
))
9125 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
9126 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
9130 /* check for collisions, even if the name isn't there */
9131 ret
= btrfs_check_dir_item_collision(dest
, new_dir
->i_ino
,
9132 new_dentry
->d_name
.name
,
9133 new_dentry
->d_name
.len
);
9136 if (ret
== -EEXIST
) {
9138 * eexist without a new_inode */
9139 if (WARN_ON(!new_inode
)) {
9143 /* maybe -EOVERFLOW */
9150 * we're using rename to replace one file with another. Start IO on it
9151 * now so we don't add too much work to the end of the transaction
9153 if (new_inode
&& S_ISREG(old_inode
->i_mode
) && new_inode
->i_size
)
9154 filemap_flush(old_inode
->i_mapping
);
9156 /* close the racy window with snapshot create/destroy ioctl */
9157 if (old_ino
== BTRFS_FIRST_FREE_OBJECTID
)
9158 down_read(&fs_info
->subvol_sem
);
9160 * We want to reserve the absolute worst case amount of items. So if
9161 * both inodes are subvols and we need to unlink them then that would
9162 * require 4 item modifications, but if they are both normal inodes it
9163 * would require 5 item modifications, so we'll assume they are normal
9164 * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items
9165 * should cover the worst case number of items we'll modify.
9166 * If our rename has the whiteout flag, we need more 5 units for the
9167 * new inode (1 inode item, 1 inode ref, 2 dir items and 1 xattr item
9168 * when selinux is enabled).
9170 trans_num_items
= 11;
9171 if (flags
& RENAME_WHITEOUT
)
9172 trans_num_items
+= 5;
9173 trans
= btrfs_start_transaction(root
, trans_num_items
);
9174 if (IS_ERR(trans
)) {
9175 ret
= PTR_ERR(trans
);
9180 btrfs_record_root_in_trans(trans
, dest
);
9182 ret
= btrfs_set_inode_index(BTRFS_I(new_dir
), &index
);
9186 BTRFS_I(old_inode
)->dir_index
= 0ULL;
9187 if (unlikely(old_ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
9188 /* force full log commit if subvolume involved. */
9189 btrfs_set_log_full_commit(trans
);
9191 btrfs_pin_log_trans(root
);
9193 ret
= btrfs_insert_inode_ref(trans
, dest
,
9194 new_dentry
->d_name
.name
,
9195 new_dentry
->d_name
.len
,
9197 btrfs_ino(BTRFS_I(new_dir
)), index
);
9202 inode_inc_iversion(old_dir
);
9203 inode_inc_iversion(new_dir
);
9204 inode_inc_iversion(old_inode
);
9205 old_dir
->i_ctime
= old_dir
->i_mtime
=
9206 new_dir
->i_ctime
= new_dir
->i_mtime
=
9207 old_inode
->i_ctime
= current_time(old_dir
);
9209 if (old_dentry
->d_parent
!= new_dentry
->d_parent
)
9210 btrfs_record_unlink_dir(trans
, BTRFS_I(old_dir
),
9211 BTRFS_I(old_inode
), 1);
9213 if (unlikely(old_ino
== BTRFS_FIRST_FREE_OBJECTID
)) {
9214 ret
= btrfs_unlink_subvol(trans
, old_dir
, old_dentry
);
9216 ret
= __btrfs_unlink_inode(trans
, root
, BTRFS_I(old_dir
),
9217 BTRFS_I(d_inode(old_dentry
)),
9218 old_dentry
->d_name
.name
,
9219 old_dentry
->d_name
.len
);
9221 ret
= btrfs_update_inode(trans
, root
, old_inode
);
9224 btrfs_abort_transaction(trans
, ret
);
9229 inode_inc_iversion(new_inode
);
9230 new_inode
->i_ctime
= current_time(new_inode
);
9231 if (unlikely(btrfs_ino(BTRFS_I(new_inode
)) ==
9232 BTRFS_EMPTY_SUBVOL_DIR_OBJECTID
)) {
9233 ret
= btrfs_unlink_subvol(trans
, new_dir
, new_dentry
);
9234 BUG_ON(new_inode
->i_nlink
== 0);
9236 ret
= btrfs_unlink_inode(trans
, dest
, BTRFS_I(new_dir
),
9237 BTRFS_I(d_inode(new_dentry
)),
9238 new_dentry
->d_name
.name
,
9239 new_dentry
->d_name
.len
);
9241 if (!ret
&& new_inode
->i_nlink
== 0)
9242 ret
= btrfs_orphan_add(trans
,
9243 BTRFS_I(d_inode(new_dentry
)));
9245 btrfs_abort_transaction(trans
, ret
);
9250 ret
= btrfs_add_link(trans
, BTRFS_I(new_dir
), BTRFS_I(old_inode
),
9251 new_dentry
->d_name
.name
,
9252 new_dentry
->d_name
.len
, 0, index
);
9254 btrfs_abort_transaction(trans
, ret
);
9258 if (old_inode
->i_nlink
== 1)
9259 BTRFS_I(old_inode
)->dir_index
= index
;
9262 struct dentry
*parent
= new_dentry
->d_parent
;
9264 btrfs_init_log_ctx(&ctx
, old_inode
);
9265 ret
= btrfs_log_new_name(trans
, BTRFS_I(old_inode
),
9266 BTRFS_I(old_dir
), parent
,
9268 if (ret
== BTRFS_NEED_LOG_SYNC
)
9270 else if (ret
== BTRFS_NEED_TRANS_COMMIT
)
9271 commit_transaction
= true;
9273 btrfs_end_log_trans(root
);
9277 if (flags
& RENAME_WHITEOUT
) {
9278 ret
= btrfs_whiteout_for_rename(trans
, root
, old_dir
,
9282 btrfs_abort_transaction(trans
, ret
);
9288 * If we have pinned the log and an error happened, we unpin tasks
9289 * trying to sync the log and force them to fallback to a transaction
9290 * commit if the log currently contains any of the inodes involved in
9291 * this rename operation (to ensure we do not persist a log with an
9292 * inconsistent state for any of these inodes or leading to any
9293 * inconsistencies when replayed). If the transaction was aborted, the
9294 * abortion reason is propagated to userspace when attempting to commit
9295 * the transaction. If the log does not contain any of these inodes, we
9296 * allow the tasks to sync it.
9298 if (ret
&& log_pinned
) {
9299 if (btrfs_inode_in_log(BTRFS_I(old_dir
), fs_info
->generation
) ||
9300 btrfs_inode_in_log(BTRFS_I(new_dir
), fs_info
->generation
) ||
9301 btrfs_inode_in_log(BTRFS_I(old_inode
), fs_info
->generation
) ||
9303 btrfs_inode_in_log(BTRFS_I(new_inode
), fs_info
->generation
)))
9304 btrfs_set_log_full_commit(trans
);
9306 btrfs_end_log_trans(root
);
9309 if (!ret
&& sync_log
) {
9310 ret
= btrfs_sync_log(trans
, BTRFS_I(old_inode
)->root
, &ctx
);
9312 commit_transaction
= true;
9313 } else if (sync_log
) {
9314 mutex_lock(&root
->log_mutex
);
9315 list_del(&ctx
.list
);
9316 mutex_unlock(&root
->log_mutex
);
9318 if (commit_transaction
) {
9319 ret
= btrfs_commit_transaction(trans
);
9323 ret2
= btrfs_end_transaction(trans
);
9324 ret
= ret
? ret
: ret2
;
9327 if (old_ino
== BTRFS_FIRST_FREE_OBJECTID
)
9328 up_read(&fs_info
->subvol_sem
);
9333 static int btrfs_rename2(struct inode
*old_dir
, struct dentry
*old_dentry
,
9334 struct inode
*new_dir
, struct dentry
*new_dentry
,
9337 if (flags
& ~(RENAME_NOREPLACE
| RENAME_EXCHANGE
| RENAME_WHITEOUT
))
9340 if (flags
& RENAME_EXCHANGE
)
9341 return btrfs_rename_exchange(old_dir
, old_dentry
, new_dir
,
9344 return btrfs_rename(old_dir
, old_dentry
, new_dir
, new_dentry
, flags
);
9347 struct btrfs_delalloc_work
{
9348 struct inode
*inode
;
9349 struct completion completion
;
9350 struct list_head list
;
9351 struct btrfs_work work
;
9354 static void btrfs_run_delalloc_work(struct btrfs_work
*work
)
9356 struct btrfs_delalloc_work
*delalloc_work
;
9357 struct inode
*inode
;
9359 delalloc_work
= container_of(work
, struct btrfs_delalloc_work
,
9361 inode
= delalloc_work
->inode
;
9362 filemap_flush(inode
->i_mapping
);
9363 if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT
,
9364 &BTRFS_I(inode
)->runtime_flags
))
9365 filemap_flush(inode
->i_mapping
);
9368 complete(&delalloc_work
->completion
);
9371 static struct btrfs_delalloc_work
*btrfs_alloc_delalloc_work(struct inode
*inode
)
9373 struct btrfs_delalloc_work
*work
;
9375 work
= kmalloc(sizeof(*work
), GFP_NOFS
);
9379 init_completion(&work
->completion
);
9380 INIT_LIST_HEAD(&work
->list
);
9381 work
->inode
= inode
;
9382 btrfs_init_work(&work
->work
, btrfs_run_delalloc_work
, NULL
, NULL
);
9388 * some fairly slow code that needs optimization. This walks the list
9389 * of all the inodes with pending delalloc and forces them to disk.
9391 static int start_delalloc_inodes(struct btrfs_root
*root
, int nr
, bool snapshot
)
9393 struct btrfs_inode
*binode
;
9394 struct inode
*inode
;
9395 struct btrfs_delalloc_work
*work
, *next
;
9396 struct list_head works
;
9397 struct list_head splice
;
9400 INIT_LIST_HEAD(&works
);
9401 INIT_LIST_HEAD(&splice
);
9403 mutex_lock(&root
->delalloc_mutex
);
9404 spin_lock(&root
->delalloc_lock
);
9405 list_splice_init(&root
->delalloc_inodes
, &splice
);
9406 while (!list_empty(&splice
)) {
9407 binode
= list_entry(splice
.next
, struct btrfs_inode
,
9410 list_move_tail(&binode
->delalloc_inodes
,
9411 &root
->delalloc_inodes
);
9412 inode
= igrab(&binode
->vfs_inode
);
9414 cond_resched_lock(&root
->delalloc_lock
);
9417 spin_unlock(&root
->delalloc_lock
);
9420 set_bit(BTRFS_INODE_SNAPSHOT_FLUSH
,
9421 &binode
->runtime_flags
);
9422 work
= btrfs_alloc_delalloc_work(inode
);
9428 list_add_tail(&work
->list
, &works
);
9429 btrfs_queue_work(root
->fs_info
->flush_workers
,
9432 if (nr
!= -1 && ret
>= nr
)
9435 spin_lock(&root
->delalloc_lock
);
9437 spin_unlock(&root
->delalloc_lock
);
9440 list_for_each_entry_safe(work
, next
, &works
, list
) {
9441 list_del_init(&work
->list
);
9442 wait_for_completion(&work
->completion
);
9446 if (!list_empty(&splice
)) {
9447 spin_lock(&root
->delalloc_lock
);
9448 list_splice_tail(&splice
, &root
->delalloc_inodes
);
9449 spin_unlock(&root
->delalloc_lock
);
9451 mutex_unlock(&root
->delalloc_mutex
);
9455 int btrfs_start_delalloc_snapshot(struct btrfs_root
*root
)
9457 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
9460 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
))
9463 ret
= start_delalloc_inodes(root
, -1, true);
9469 int btrfs_start_delalloc_roots(struct btrfs_fs_info
*fs_info
, int nr
)
9471 struct btrfs_root
*root
;
9472 struct list_head splice
;
9475 if (test_bit(BTRFS_FS_STATE_ERROR
, &fs_info
->fs_state
))
9478 INIT_LIST_HEAD(&splice
);
9480 mutex_lock(&fs_info
->delalloc_root_mutex
);
9481 spin_lock(&fs_info
->delalloc_root_lock
);
9482 list_splice_init(&fs_info
->delalloc_roots
, &splice
);
9483 while (!list_empty(&splice
) && nr
) {
9484 root
= list_first_entry(&splice
, struct btrfs_root
,
9486 root
= btrfs_grab_root(root
);
9488 list_move_tail(&root
->delalloc_root
,
9489 &fs_info
->delalloc_roots
);
9490 spin_unlock(&fs_info
->delalloc_root_lock
);
9492 ret
= start_delalloc_inodes(root
, nr
, false);
9493 btrfs_put_root(root
);
9501 spin_lock(&fs_info
->delalloc_root_lock
);
9503 spin_unlock(&fs_info
->delalloc_root_lock
);
9507 if (!list_empty(&splice
)) {
9508 spin_lock(&fs_info
->delalloc_root_lock
);
9509 list_splice_tail(&splice
, &fs_info
->delalloc_roots
);
9510 spin_unlock(&fs_info
->delalloc_root_lock
);
9512 mutex_unlock(&fs_info
->delalloc_root_mutex
);
9516 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
9517 const char *symname
)
9519 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
9520 struct btrfs_trans_handle
*trans
;
9521 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
9522 struct btrfs_path
*path
;
9523 struct btrfs_key key
;
9524 struct inode
*inode
= NULL
;
9531 struct btrfs_file_extent_item
*ei
;
9532 struct extent_buffer
*leaf
;
9534 name_len
= strlen(symname
);
9535 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(fs_info
))
9536 return -ENAMETOOLONG
;
9539 * 2 items for inode item and ref
9540 * 2 items for dir items
9541 * 1 item for updating parent inode item
9542 * 1 item for the inline extent item
9543 * 1 item for xattr if selinux is on
9545 trans
= btrfs_start_transaction(root
, 7);
9547 return PTR_ERR(trans
);
9549 err
= btrfs_find_free_ino(root
, &objectid
);
9553 inode
= btrfs_new_inode(trans
, root
, dir
, dentry
->d_name
.name
,
9554 dentry
->d_name
.len
, btrfs_ino(BTRFS_I(dir
)),
9555 objectid
, S_IFLNK
|S_IRWXUGO
, &index
);
9556 if (IS_ERR(inode
)) {
9557 err
= PTR_ERR(inode
);
9563 * If the active LSM wants to access the inode during
9564 * d_instantiate it needs these. Smack checks to see
9565 * if the filesystem supports xattrs by looking at the
9568 inode
->i_fop
= &btrfs_file_operations
;
9569 inode
->i_op
= &btrfs_file_inode_operations
;
9570 inode
->i_mapping
->a_ops
= &btrfs_aops
;
9571 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
9573 err
= btrfs_init_inode_security(trans
, inode
, dir
, &dentry
->d_name
);
9577 path
= btrfs_alloc_path();
9582 key
.objectid
= btrfs_ino(BTRFS_I(inode
));
9584 key
.type
= BTRFS_EXTENT_DATA_KEY
;
9585 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
9586 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
9589 btrfs_free_path(path
);
9592 leaf
= path
->nodes
[0];
9593 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
9594 struct btrfs_file_extent_item
);
9595 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
9596 btrfs_set_file_extent_type(leaf
, ei
,
9597 BTRFS_FILE_EXTENT_INLINE
);
9598 btrfs_set_file_extent_encryption(leaf
, ei
, 0);
9599 btrfs_set_file_extent_compression(leaf
, ei
, 0);
9600 btrfs_set_file_extent_other_encoding(leaf
, ei
, 0);
9601 btrfs_set_file_extent_ram_bytes(leaf
, ei
, name_len
);
9603 ptr
= btrfs_file_extent_inline_start(ei
);
9604 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
9605 btrfs_mark_buffer_dirty(leaf
);
9606 btrfs_free_path(path
);
9608 inode
->i_op
= &btrfs_symlink_inode_operations
;
9609 inode_nohighmem(inode
);
9610 inode_set_bytes(inode
, name_len
);
9611 btrfs_i_size_write(BTRFS_I(inode
), name_len
);
9612 err
= btrfs_update_inode(trans
, root
, inode
);
9614 * Last step, add directory indexes for our symlink inode. This is the
9615 * last step to avoid extra cleanup of these indexes if an error happens
9619 err
= btrfs_add_nondir(trans
, BTRFS_I(dir
), dentry
,
9620 BTRFS_I(inode
), 0, index
);
9624 d_instantiate_new(dentry
, inode
);
9627 btrfs_end_transaction(trans
);
9629 inode_dec_link_count(inode
);
9630 discard_new_inode(inode
);
9632 btrfs_btree_balance_dirty(fs_info
);
9636 static int insert_prealloc_file_extent(struct btrfs_trans_handle
*trans
,
9637 struct inode
*inode
, struct btrfs_key
*ins
,
9640 struct btrfs_file_extent_item stack_fi
;
9641 u64 start
= ins
->objectid
;
9642 u64 len
= ins
->offset
;
9645 memset(&stack_fi
, 0, sizeof(stack_fi
));
9647 btrfs_set_stack_file_extent_type(&stack_fi
, BTRFS_FILE_EXTENT_PREALLOC
);
9648 btrfs_set_stack_file_extent_disk_bytenr(&stack_fi
, start
);
9649 btrfs_set_stack_file_extent_disk_num_bytes(&stack_fi
, len
);
9650 btrfs_set_stack_file_extent_num_bytes(&stack_fi
, len
);
9651 btrfs_set_stack_file_extent_ram_bytes(&stack_fi
, len
);
9652 btrfs_set_stack_file_extent_compression(&stack_fi
, BTRFS_COMPRESS_NONE
);
9653 /* Encryption and other encoding is reserved and all 0 */
9655 ret
= btrfs_qgroup_release_data(BTRFS_I(inode
), file_offset
, len
);
9658 return insert_reserved_file_extent(trans
, BTRFS_I(inode
), file_offset
,
9661 static int __btrfs_prealloc_file_range(struct inode
*inode
, int mode
,
9662 u64 start
, u64 num_bytes
, u64 min_size
,
9663 loff_t actual_len
, u64
*alloc_hint
,
9664 struct btrfs_trans_handle
*trans
)
9666 struct btrfs_fs_info
*fs_info
= btrfs_sb(inode
->i_sb
);
9667 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
9668 struct extent_map
*em
;
9669 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
9670 struct btrfs_key ins
;
9671 u64 cur_offset
= start
;
9672 u64 clear_offset
= start
;
9675 u64 last_alloc
= (u64
)-1;
9677 bool own_trans
= true;
9678 u64 end
= start
+ num_bytes
- 1;
9682 while (num_bytes
> 0) {
9684 trans
= btrfs_start_transaction(root
, 3);
9685 if (IS_ERR(trans
)) {
9686 ret
= PTR_ERR(trans
);
9691 cur_bytes
= min_t(u64
, num_bytes
, SZ_256M
);
9692 cur_bytes
= max(cur_bytes
, min_size
);
9694 * If we are severely fragmented we could end up with really
9695 * small allocations, so if the allocator is returning small
9696 * chunks lets make its job easier by only searching for those
9699 cur_bytes
= min(cur_bytes
, last_alloc
);
9700 ret
= btrfs_reserve_extent(root
, cur_bytes
, cur_bytes
,
9701 min_size
, 0, *alloc_hint
, &ins
, 1, 0);
9704 btrfs_end_transaction(trans
);
9709 * We've reserved this space, and thus converted it from
9710 * ->bytes_may_use to ->bytes_reserved. Any error that happens
9711 * from here on out we will only need to clear our reservation
9712 * for the remaining unreserved area, so advance our
9713 * clear_offset by our extent size.
9715 clear_offset
+= ins
.offset
;
9716 btrfs_dec_block_group_reservations(fs_info
, ins
.objectid
);
9718 last_alloc
= ins
.offset
;
9719 ret
= insert_prealloc_file_extent(trans
, inode
, &ins
, cur_offset
);
9721 btrfs_free_reserved_extent(fs_info
, ins
.objectid
,
9723 btrfs_abort_transaction(trans
, ret
);
9725 btrfs_end_transaction(trans
);
9729 btrfs_drop_extent_cache(BTRFS_I(inode
), cur_offset
,
9730 cur_offset
+ ins
.offset
-1, 0);
9732 em
= alloc_extent_map();
9734 set_bit(BTRFS_INODE_NEEDS_FULL_SYNC
,
9735 &BTRFS_I(inode
)->runtime_flags
);
9739 em
->start
= cur_offset
;
9740 em
->orig_start
= cur_offset
;
9741 em
->len
= ins
.offset
;
9742 em
->block_start
= ins
.objectid
;
9743 em
->block_len
= ins
.offset
;
9744 em
->orig_block_len
= ins
.offset
;
9745 em
->ram_bytes
= ins
.offset
;
9746 set_bit(EXTENT_FLAG_PREALLOC
, &em
->flags
);
9747 em
->generation
= trans
->transid
;
9750 write_lock(&em_tree
->lock
);
9751 ret
= add_extent_mapping(em_tree
, em
, 1);
9752 write_unlock(&em_tree
->lock
);
9755 btrfs_drop_extent_cache(BTRFS_I(inode
), cur_offset
,
9756 cur_offset
+ ins
.offset
- 1,
9759 free_extent_map(em
);
9761 num_bytes
-= ins
.offset
;
9762 cur_offset
+= ins
.offset
;
9763 *alloc_hint
= ins
.objectid
+ ins
.offset
;
9765 inode_inc_iversion(inode
);
9766 inode
->i_ctime
= current_time(inode
);
9767 BTRFS_I(inode
)->flags
|= BTRFS_INODE_PREALLOC
;
9768 if (!(mode
& FALLOC_FL_KEEP_SIZE
) &&
9769 (actual_len
> inode
->i_size
) &&
9770 (cur_offset
> inode
->i_size
)) {
9771 if (cur_offset
> actual_len
)
9772 i_size
= actual_len
;
9774 i_size
= cur_offset
;
9775 i_size_write(inode
, i_size
);
9776 btrfs_inode_safe_disk_i_size_write(inode
, 0);
9779 ret
= btrfs_update_inode(trans
, root
, inode
);
9782 btrfs_abort_transaction(trans
, ret
);
9784 btrfs_end_transaction(trans
);
9789 btrfs_end_transaction(trans
);
9791 if (clear_offset
< end
)
9792 btrfs_free_reserved_data_space(BTRFS_I(inode
), NULL
, clear_offset
,
9793 end
- clear_offset
+ 1);
9797 int btrfs_prealloc_file_range(struct inode
*inode
, int mode
,
9798 u64 start
, u64 num_bytes
, u64 min_size
,
9799 loff_t actual_len
, u64
*alloc_hint
)
9801 return __btrfs_prealloc_file_range(inode
, mode
, start
, num_bytes
,
9802 min_size
, actual_len
, alloc_hint
,
9806 int btrfs_prealloc_file_range_trans(struct inode
*inode
,
9807 struct btrfs_trans_handle
*trans
, int mode
,
9808 u64 start
, u64 num_bytes
, u64 min_size
,
9809 loff_t actual_len
, u64
*alloc_hint
)
9811 return __btrfs_prealloc_file_range(inode
, mode
, start
, num_bytes
,
9812 min_size
, actual_len
, alloc_hint
, trans
);
9815 static int btrfs_set_page_dirty(struct page
*page
)
9817 return __set_page_dirty_nobuffers(page
);
9820 static int btrfs_permission(struct inode
*inode
, int mask
)
9822 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
9823 umode_t mode
= inode
->i_mode
;
9825 if (mask
& MAY_WRITE
&&
9826 (S_ISREG(mode
) || S_ISDIR(mode
) || S_ISLNK(mode
))) {
9827 if (btrfs_root_readonly(root
))
9829 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_READONLY
)
9832 return generic_permission(inode
, mask
);
9835 static int btrfs_tmpfile(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
9837 struct btrfs_fs_info
*fs_info
= btrfs_sb(dir
->i_sb
);
9838 struct btrfs_trans_handle
*trans
;
9839 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
9840 struct inode
*inode
= NULL
;
9846 * 5 units required for adding orphan entry
9848 trans
= btrfs_start_transaction(root
, 5);
9850 return PTR_ERR(trans
);
9852 ret
= btrfs_find_free_ino(root
, &objectid
);
9856 inode
= btrfs_new_inode(trans
, root
, dir
, NULL
, 0,
9857 btrfs_ino(BTRFS_I(dir
)), objectid
, mode
, &index
);
9858 if (IS_ERR(inode
)) {
9859 ret
= PTR_ERR(inode
);
9864 inode
->i_fop
= &btrfs_file_operations
;
9865 inode
->i_op
= &btrfs_file_inode_operations
;
9867 inode
->i_mapping
->a_ops
= &btrfs_aops
;
9868 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
9870 ret
= btrfs_init_inode_security(trans
, inode
, dir
, NULL
);
9874 ret
= btrfs_update_inode(trans
, root
, inode
);
9877 ret
= btrfs_orphan_add(trans
, BTRFS_I(inode
));
9882 * We set number of links to 0 in btrfs_new_inode(), and here we set
9883 * it to 1 because d_tmpfile() will issue a warning if the count is 0,
9886 * d_tmpfile() -> inode_dec_link_count() -> drop_nlink()
9888 set_nlink(inode
, 1);
9889 d_tmpfile(dentry
, inode
);
9890 unlock_new_inode(inode
);
9891 mark_inode_dirty(inode
);
9893 btrfs_end_transaction(trans
);
9895 discard_new_inode(inode
);
9896 btrfs_btree_balance_dirty(fs_info
);
9900 void btrfs_set_range_writeback(struct extent_io_tree
*tree
, u64 start
, u64 end
)
9902 struct inode
*inode
= tree
->private_data
;
9903 unsigned long index
= start
>> PAGE_SHIFT
;
9904 unsigned long end_index
= end
>> PAGE_SHIFT
;
9907 while (index
<= end_index
) {
9908 page
= find_get_page(inode
->i_mapping
, index
);
9909 ASSERT(page
); /* Pages should be in the extent_io_tree */
9910 set_page_writeback(page
);
9918 * Add an entry indicating a block group or device which is pinned by a
9919 * swapfile. Returns 0 on success, 1 if there is already an entry for it, or a
9920 * negative errno on failure.
9922 static int btrfs_add_swapfile_pin(struct inode
*inode
, void *ptr
,
9923 bool is_block_group
)
9925 struct btrfs_fs_info
*fs_info
= BTRFS_I(inode
)->root
->fs_info
;
9926 struct btrfs_swapfile_pin
*sp
, *entry
;
9928 struct rb_node
*parent
= NULL
;
9930 sp
= kmalloc(sizeof(*sp
), GFP_NOFS
);
9935 sp
->is_block_group
= is_block_group
;
9937 spin_lock(&fs_info
->swapfile_pins_lock
);
9938 p
= &fs_info
->swapfile_pins
.rb_node
;
9941 entry
= rb_entry(parent
, struct btrfs_swapfile_pin
, node
);
9942 if (sp
->ptr
< entry
->ptr
||
9943 (sp
->ptr
== entry
->ptr
&& sp
->inode
< entry
->inode
)) {
9945 } else if (sp
->ptr
> entry
->ptr
||
9946 (sp
->ptr
== entry
->ptr
&& sp
->inode
> entry
->inode
)) {
9947 p
= &(*p
)->rb_right
;
9949 spin_unlock(&fs_info
->swapfile_pins_lock
);
9954 rb_link_node(&sp
->node
, parent
, p
);
9955 rb_insert_color(&sp
->node
, &fs_info
->swapfile_pins
);
9956 spin_unlock(&fs_info
->swapfile_pins_lock
);
9960 /* Free all of the entries pinned by this swapfile. */
9961 static void btrfs_free_swapfile_pins(struct inode
*inode
)
9963 struct btrfs_fs_info
*fs_info
= BTRFS_I(inode
)->root
->fs_info
;
9964 struct btrfs_swapfile_pin
*sp
;
9965 struct rb_node
*node
, *next
;
9967 spin_lock(&fs_info
->swapfile_pins_lock
);
9968 node
= rb_first(&fs_info
->swapfile_pins
);
9970 next
= rb_next(node
);
9971 sp
= rb_entry(node
, struct btrfs_swapfile_pin
, node
);
9972 if (sp
->inode
== inode
) {
9973 rb_erase(&sp
->node
, &fs_info
->swapfile_pins
);
9974 if (sp
->is_block_group
)
9975 btrfs_put_block_group(sp
->ptr
);
9980 spin_unlock(&fs_info
->swapfile_pins_lock
);
9983 struct btrfs_swap_info
{
9989 unsigned long nr_pages
;
9993 static int btrfs_add_swap_extent(struct swap_info_struct
*sis
,
9994 struct btrfs_swap_info
*bsi
)
9996 unsigned long nr_pages
;
9997 u64 first_ppage
, first_ppage_reported
, next_ppage
;
10000 first_ppage
= ALIGN(bsi
->block_start
, PAGE_SIZE
) >> PAGE_SHIFT
;
10001 next_ppage
= ALIGN_DOWN(bsi
->block_start
+ bsi
->block_len
,
10002 PAGE_SIZE
) >> PAGE_SHIFT
;
10004 if (first_ppage
>= next_ppage
)
10006 nr_pages
= next_ppage
- first_ppage
;
10008 first_ppage_reported
= first_ppage
;
10009 if (bsi
->start
== 0)
10010 first_ppage_reported
++;
10011 if (bsi
->lowest_ppage
> first_ppage_reported
)
10012 bsi
->lowest_ppage
= first_ppage_reported
;
10013 if (bsi
->highest_ppage
< (next_ppage
- 1))
10014 bsi
->highest_ppage
= next_ppage
- 1;
10016 ret
= add_swap_extent(sis
, bsi
->nr_pages
, nr_pages
, first_ppage
);
10019 bsi
->nr_extents
+= ret
;
10020 bsi
->nr_pages
+= nr_pages
;
10024 static void btrfs_swap_deactivate(struct file
*file
)
10026 struct inode
*inode
= file_inode(file
);
10028 btrfs_free_swapfile_pins(inode
);
10029 atomic_dec(&BTRFS_I(inode
)->root
->nr_swapfiles
);
10032 static int btrfs_swap_activate(struct swap_info_struct
*sis
, struct file
*file
,
10035 struct inode
*inode
= file_inode(file
);
10036 struct btrfs_fs_info
*fs_info
= BTRFS_I(inode
)->root
->fs_info
;
10037 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
10038 struct extent_state
*cached_state
= NULL
;
10039 struct extent_map
*em
= NULL
;
10040 struct btrfs_device
*device
= NULL
;
10041 struct btrfs_swap_info bsi
= {
10042 .lowest_ppage
= (sector_t
)-1ULL,
10049 * If the swap file was just created, make sure delalloc is done. If the
10050 * file changes again after this, the user is doing something stupid and
10051 * we don't really care.
10053 ret
= btrfs_wait_ordered_range(inode
, 0, (u64
)-1);
10058 * The inode is locked, so these flags won't change after we check them.
10060 if (BTRFS_I(inode
)->flags
& BTRFS_INODE_COMPRESS
) {
10061 btrfs_warn(fs_info
, "swapfile must not be compressed");
10064 if (!(BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATACOW
)) {
10065 btrfs_warn(fs_info
, "swapfile must not be copy-on-write");
10068 if (!(BTRFS_I(inode
)->flags
& BTRFS_INODE_NODATASUM
)) {
10069 btrfs_warn(fs_info
, "swapfile must not be checksummed");
10074 * Balance or device remove/replace/resize can move stuff around from
10075 * under us. The EXCL_OP flag makes sure they aren't running/won't run
10076 * concurrently while we are mapping the swap extents, and
10077 * fs_info->swapfile_pins prevents them from running while the swap file
10078 * is active and moving the extents. Note that this also prevents a
10079 * concurrent device add which isn't actually necessary, but it's not
10080 * really worth the trouble to allow it.
10082 if (test_and_set_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
)) {
10083 btrfs_warn(fs_info
,
10084 "cannot activate swapfile while exclusive operation is running");
10088 * Snapshots can create extents which require COW even if NODATACOW is
10089 * set. We use this counter to prevent snapshots. We must increment it
10090 * before walking the extents because we don't want a concurrent
10091 * snapshot to run after we've already checked the extents.
10093 atomic_inc(&BTRFS_I(inode
)->root
->nr_swapfiles
);
10095 isize
= ALIGN_DOWN(inode
->i_size
, fs_info
->sectorsize
);
10097 lock_extent_bits(io_tree
, 0, isize
- 1, &cached_state
);
10099 while (start
< isize
) {
10100 u64 logical_block_start
, physical_block_start
;
10101 struct btrfs_block_group
*bg
;
10102 u64 len
= isize
- start
;
10104 em
= btrfs_get_extent(BTRFS_I(inode
), NULL
, 0, start
, len
);
10110 if (em
->block_start
== EXTENT_MAP_HOLE
) {
10111 btrfs_warn(fs_info
, "swapfile must not have holes");
10115 if (em
->block_start
== EXTENT_MAP_INLINE
) {
10117 * It's unlikely we'll ever actually find ourselves
10118 * here, as a file small enough to fit inline won't be
10119 * big enough to store more than the swap header, but in
10120 * case something changes in the future, let's catch it
10121 * here rather than later.
10123 btrfs_warn(fs_info
, "swapfile must not be inline");
10127 if (test_bit(EXTENT_FLAG_COMPRESSED
, &em
->flags
)) {
10128 btrfs_warn(fs_info
, "swapfile must not be compressed");
10133 logical_block_start
= em
->block_start
+ (start
- em
->start
);
10134 len
= min(len
, em
->len
- (start
- em
->start
));
10135 free_extent_map(em
);
10138 ret
= can_nocow_extent(inode
, start
, &len
, NULL
, NULL
, NULL
, true);
10144 btrfs_warn(fs_info
,
10145 "swapfile must not be copy-on-write");
10150 em
= btrfs_get_chunk_map(fs_info
, logical_block_start
, len
);
10156 if (em
->map_lookup
->type
& BTRFS_BLOCK_GROUP_PROFILE_MASK
) {
10157 btrfs_warn(fs_info
,
10158 "swapfile must have single data profile");
10163 if (device
== NULL
) {
10164 device
= em
->map_lookup
->stripes
[0].dev
;
10165 ret
= btrfs_add_swapfile_pin(inode
, device
, false);
10170 } else if (device
!= em
->map_lookup
->stripes
[0].dev
) {
10171 btrfs_warn(fs_info
, "swapfile must be on one device");
10176 physical_block_start
= (em
->map_lookup
->stripes
[0].physical
+
10177 (logical_block_start
- em
->start
));
10178 len
= min(len
, em
->len
- (logical_block_start
- em
->start
));
10179 free_extent_map(em
);
10182 bg
= btrfs_lookup_block_group(fs_info
, logical_block_start
);
10184 btrfs_warn(fs_info
,
10185 "could not find block group containing swapfile");
10190 ret
= btrfs_add_swapfile_pin(inode
, bg
, true);
10192 btrfs_put_block_group(bg
);
10199 if (bsi
.block_len
&&
10200 bsi
.block_start
+ bsi
.block_len
== physical_block_start
) {
10201 bsi
.block_len
+= len
;
10203 if (bsi
.block_len
) {
10204 ret
= btrfs_add_swap_extent(sis
, &bsi
);
10209 bsi
.block_start
= physical_block_start
;
10210 bsi
.block_len
= len
;
10217 ret
= btrfs_add_swap_extent(sis
, &bsi
);
10220 if (!IS_ERR_OR_NULL(em
))
10221 free_extent_map(em
);
10223 unlock_extent_cached(io_tree
, 0, isize
- 1, &cached_state
);
10226 btrfs_swap_deactivate(file
);
10228 clear_bit(BTRFS_FS_EXCL_OP
, &fs_info
->flags
);
10234 sis
->bdev
= device
->bdev
;
10235 *span
= bsi
.highest_ppage
- bsi
.lowest_ppage
+ 1;
10236 sis
->max
= bsi
.nr_pages
;
10237 sis
->pages
= bsi
.nr_pages
- 1;
10238 sis
->highest_bit
= bsi
.nr_pages
- 1;
10239 return bsi
.nr_extents
;
10242 static void btrfs_swap_deactivate(struct file
*file
)
10246 static int btrfs_swap_activate(struct swap_info_struct
*sis
, struct file
*file
,
10249 return -EOPNOTSUPP
;
10253 static const struct inode_operations btrfs_dir_inode_operations
= {
10254 .getattr
= btrfs_getattr
,
10255 .lookup
= btrfs_lookup
,
10256 .create
= btrfs_create
,
10257 .unlink
= btrfs_unlink
,
10258 .link
= btrfs_link
,
10259 .mkdir
= btrfs_mkdir
,
10260 .rmdir
= btrfs_rmdir
,
10261 .rename
= btrfs_rename2
,
10262 .symlink
= btrfs_symlink
,
10263 .setattr
= btrfs_setattr
,
10264 .mknod
= btrfs_mknod
,
10265 .listxattr
= btrfs_listxattr
,
10266 .permission
= btrfs_permission
,
10267 .get_acl
= btrfs_get_acl
,
10268 .set_acl
= btrfs_set_acl
,
10269 .update_time
= btrfs_update_time
,
10270 .tmpfile
= btrfs_tmpfile
,
10273 static const struct file_operations btrfs_dir_file_operations
= {
10274 .llseek
= generic_file_llseek
,
10275 .read
= generic_read_dir
,
10276 .iterate_shared
= btrfs_real_readdir
,
10277 .open
= btrfs_opendir
,
10278 .unlocked_ioctl
= btrfs_ioctl
,
10279 #ifdef CONFIG_COMPAT
10280 .compat_ioctl
= btrfs_compat_ioctl
,
10282 .release
= btrfs_release_file
,
10283 .fsync
= btrfs_sync_file
,
10286 static const struct extent_io_ops btrfs_extent_io_ops
= {
10287 /* mandatory callbacks */
10288 .submit_bio_hook
= btrfs_submit_bio_hook
,
10289 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
10293 * btrfs doesn't support the bmap operation because swapfiles
10294 * use bmap to make a mapping of extents in the file. They assume
10295 * these extents won't change over the life of the file and they
10296 * use the bmap result to do IO directly to the drive.
10298 * the btrfs bmap call would return logical addresses that aren't
10299 * suitable for IO and they also will change frequently as COW
10300 * operations happen. So, swapfile + btrfs == corruption.
10302 * For now we're avoiding this by dropping bmap.
10304 static const struct address_space_operations btrfs_aops
= {
10305 .readpage
= btrfs_readpage
,
10306 .writepage
= btrfs_writepage
,
10307 .writepages
= btrfs_writepages
,
10308 .readahead
= btrfs_readahead
,
10309 .direct_IO
= btrfs_direct_IO
,
10310 .invalidatepage
= btrfs_invalidatepage
,
10311 .releasepage
= btrfs_releasepage
,
10312 #ifdef CONFIG_MIGRATION
10313 .migratepage
= btrfs_migratepage
,
10315 .set_page_dirty
= btrfs_set_page_dirty
,
10316 .error_remove_page
= generic_error_remove_page
,
10317 .swap_activate
= btrfs_swap_activate
,
10318 .swap_deactivate
= btrfs_swap_deactivate
,
10321 static const struct inode_operations btrfs_file_inode_operations
= {
10322 .getattr
= btrfs_getattr
,
10323 .setattr
= btrfs_setattr
,
10324 .listxattr
= btrfs_listxattr
,
10325 .permission
= btrfs_permission
,
10326 .fiemap
= btrfs_fiemap
,
10327 .get_acl
= btrfs_get_acl
,
10328 .set_acl
= btrfs_set_acl
,
10329 .update_time
= btrfs_update_time
,
10331 static const struct inode_operations btrfs_special_inode_operations
= {
10332 .getattr
= btrfs_getattr
,
10333 .setattr
= btrfs_setattr
,
10334 .permission
= btrfs_permission
,
10335 .listxattr
= btrfs_listxattr
,
10336 .get_acl
= btrfs_get_acl
,
10337 .set_acl
= btrfs_set_acl
,
10338 .update_time
= btrfs_update_time
,
10340 static const struct inode_operations btrfs_symlink_inode_operations
= {
10341 .get_link
= page_get_link
,
10342 .getattr
= btrfs_getattr
,
10343 .setattr
= btrfs_setattr
,
10344 .permission
= btrfs_permission
,
10345 .listxattr
= btrfs_listxattr
,
10346 .update_time
= btrfs_update_time
,
10349 const struct dentry_operations btrfs_dentry_operations
= {
10350 .d_delete
= btrfs_dentry_delete
,