2 * Copyright (C) 2011, 2012 STRATO. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/blkdev.h>
20 #include <linux/ratelimit.h>
24 #include "ordered-data.h"
25 #include "transaction.h"
27 #include "extent_io.h"
28 #include "dev-replace.h"
29 #include "check-integrity.h"
30 #include "rcu-string.h"
34 * This is only the first step towards a full-features scrub. It reads all
35 * extent and super block and verifies the checksums. In case a bad checksum
36 * is found or the extent cannot be read, good data will be written back if
39 * Future enhancements:
40 * - In case an unrepairable extent is encountered, track which files are
41 * affected and report them
42 * - track and record media errors, throw out bad devices
43 * - add a mode to also read unallocated space
50 * the following three values only influence the performance.
51 * The last one configures the number of parallel and outstanding I/O
52 * operations. The first two values configure an upper limit for the number
53 * of (dynamically allocated) pages that are added to a bio.
55 #define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */
56 #define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */
57 #define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */
60 * the following value times PAGE_SIZE needs to be large enough to match the
61 * largest node/leaf/sector size that shall be supported.
62 * Values larger than BTRFS_STRIPE_LEN are not supported.
64 #define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */
67 struct scrub_block
*sblock
;
69 struct btrfs_device
*dev
;
70 u64 flags
; /* extent flags */
74 u64 physical_for_dev_replace
;
77 unsigned int mirror_num
:8;
78 unsigned int have_csum
:1;
79 unsigned int io_error
:1;
81 u8 csum
[BTRFS_CSUM_SIZE
];
86 struct scrub_ctx
*sctx
;
87 struct btrfs_device
*dev
;
92 #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO
93 struct scrub_page
*pagev
[SCRUB_PAGES_PER_WR_BIO
];
95 struct scrub_page
*pagev
[SCRUB_PAGES_PER_RD_BIO
];
99 struct btrfs_work work
;
103 struct scrub_page
*pagev
[SCRUB_MAX_PAGES_PER_BLOCK
];
105 atomic_t outstanding_pages
;
106 atomic_t ref_count
; /* free mem on transition to zero */
107 struct scrub_ctx
*sctx
;
109 unsigned int header_error
:1;
110 unsigned int checksum_error
:1;
111 unsigned int no_io_error_seen
:1;
112 unsigned int generation_error
:1; /* also sets header_error */
116 struct scrub_wr_ctx
{
117 struct scrub_bio
*wr_curr_bio
;
118 struct btrfs_device
*tgtdev
;
119 int pages_per_wr_bio
; /* <= SCRUB_PAGES_PER_WR_BIO */
120 atomic_t flush_all_writes
;
121 struct mutex wr_lock
;
125 struct scrub_bio
*bios
[SCRUB_BIOS_PER_SCTX
];
126 struct btrfs_root
*dev_root
;
129 atomic_t bios_in_flight
;
130 atomic_t workers_pending
;
131 spinlock_t list_lock
;
132 wait_queue_head_t list_wait
;
134 struct list_head csum_list
;
137 int pages_per_rd_bio
;
143 struct scrub_wr_ctx wr_ctx
;
148 struct btrfs_scrub_progress stat
;
149 spinlock_t stat_lock
;
152 struct scrub_fixup_nodatasum
{
153 struct scrub_ctx
*sctx
;
154 struct btrfs_device
*dev
;
156 struct btrfs_root
*root
;
157 struct btrfs_work work
;
161 struct scrub_nocow_inode
{
165 struct list_head list
;
168 struct scrub_copy_nocow_ctx
{
169 struct scrub_ctx
*sctx
;
173 u64 physical_for_dev_replace
;
174 struct list_head inodes
;
175 struct btrfs_work work
;
178 struct scrub_warning
{
179 struct btrfs_path
*path
;
180 u64 extent_item_size
;
186 struct btrfs_device
*dev
;
192 static void scrub_pending_bio_inc(struct scrub_ctx
*sctx
);
193 static void scrub_pending_bio_dec(struct scrub_ctx
*sctx
);
194 static void scrub_pending_trans_workers_inc(struct scrub_ctx
*sctx
);
195 static void scrub_pending_trans_workers_dec(struct scrub_ctx
*sctx
);
196 static int scrub_handle_errored_block(struct scrub_block
*sblock_to_check
);
197 static int scrub_setup_recheck_block(struct scrub_ctx
*sctx
,
198 struct btrfs_fs_info
*fs_info
,
199 struct scrub_block
*original_sblock
,
200 u64 length
, u64 logical
,
201 struct scrub_block
*sblocks_for_recheck
);
202 static void scrub_recheck_block(struct btrfs_fs_info
*fs_info
,
203 struct scrub_block
*sblock
, int is_metadata
,
204 int have_csum
, u8
*csum
, u64 generation
,
206 static void scrub_recheck_block_checksum(struct btrfs_fs_info
*fs_info
,
207 struct scrub_block
*sblock
,
208 int is_metadata
, int have_csum
,
209 const u8
*csum
, u64 generation
,
211 static int scrub_repair_block_from_good_copy(struct scrub_block
*sblock_bad
,
212 struct scrub_block
*sblock_good
,
214 static int scrub_repair_page_from_good_copy(struct scrub_block
*sblock_bad
,
215 struct scrub_block
*sblock_good
,
216 int page_num
, int force_write
);
217 static void scrub_write_block_to_dev_replace(struct scrub_block
*sblock
);
218 static int scrub_write_page_to_dev_replace(struct scrub_block
*sblock
,
220 static int scrub_checksum_data(struct scrub_block
*sblock
);
221 static int scrub_checksum_tree_block(struct scrub_block
*sblock
);
222 static int scrub_checksum_super(struct scrub_block
*sblock
);
223 static void scrub_block_get(struct scrub_block
*sblock
);
224 static void scrub_block_put(struct scrub_block
*sblock
);
225 static void scrub_page_get(struct scrub_page
*spage
);
226 static void scrub_page_put(struct scrub_page
*spage
);
227 static int scrub_add_page_to_rd_bio(struct scrub_ctx
*sctx
,
228 struct scrub_page
*spage
);
229 static int scrub_pages(struct scrub_ctx
*sctx
, u64 logical
, u64 len
,
230 u64 physical
, struct btrfs_device
*dev
, u64 flags
,
231 u64 gen
, int mirror_num
, u8
*csum
, int force
,
232 u64 physical_for_dev_replace
);
233 static void scrub_bio_end_io(struct bio
*bio
, int err
);
234 static void scrub_bio_end_io_worker(struct btrfs_work
*work
);
235 static void scrub_block_complete(struct scrub_block
*sblock
);
236 static void scrub_remap_extent(struct btrfs_fs_info
*fs_info
,
237 u64 extent_logical
, u64 extent_len
,
238 u64
*extent_physical
,
239 struct btrfs_device
**extent_dev
,
240 int *extent_mirror_num
);
241 static int scrub_setup_wr_ctx(struct scrub_ctx
*sctx
,
242 struct scrub_wr_ctx
*wr_ctx
,
243 struct btrfs_fs_info
*fs_info
,
244 struct btrfs_device
*dev
,
246 static void scrub_free_wr_ctx(struct scrub_wr_ctx
*wr_ctx
);
247 static int scrub_add_page_to_wr_bio(struct scrub_ctx
*sctx
,
248 struct scrub_page
*spage
);
249 static void scrub_wr_submit(struct scrub_ctx
*sctx
);
250 static void scrub_wr_bio_end_io(struct bio
*bio
, int err
);
251 static void scrub_wr_bio_end_io_worker(struct btrfs_work
*work
);
252 static int write_page_nocow(struct scrub_ctx
*sctx
,
253 u64 physical_for_dev_replace
, struct page
*page
);
254 static int copy_nocow_pages_for_inode(u64 inum
, u64 offset
, u64 root
,
255 struct scrub_copy_nocow_ctx
*ctx
);
256 static int copy_nocow_pages(struct scrub_ctx
*sctx
, u64 logical
, u64 len
,
257 int mirror_num
, u64 physical_for_dev_replace
);
258 static void copy_nocow_pages_worker(struct btrfs_work
*work
);
261 static void scrub_pending_bio_inc(struct scrub_ctx
*sctx
)
263 atomic_inc(&sctx
->bios_in_flight
);
266 static void scrub_pending_bio_dec(struct scrub_ctx
*sctx
)
268 atomic_dec(&sctx
->bios_in_flight
);
269 wake_up(&sctx
->list_wait
);
273 * used for workers that require transaction commits (i.e., for the
276 static void scrub_pending_trans_workers_inc(struct scrub_ctx
*sctx
)
278 struct btrfs_fs_info
*fs_info
= sctx
->dev_root
->fs_info
;
281 * increment scrubs_running to prevent cancel requests from
282 * completing as long as a worker is running. we must also
283 * increment scrubs_paused to prevent deadlocking on pause
284 * requests used for transactions commits (as the worker uses a
285 * transaction context). it is safe to regard the worker
286 * as paused for all matters practical. effectively, we only
287 * avoid cancellation requests from completing.
289 mutex_lock(&fs_info
->scrub_lock
);
290 atomic_inc(&fs_info
->scrubs_running
);
291 atomic_inc(&fs_info
->scrubs_paused
);
292 mutex_unlock(&fs_info
->scrub_lock
);
293 atomic_inc(&sctx
->workers_pending
);
296 /* used for workers that require transaction commits */
297 static void scrub_pending_trans_workers_dec(struct scrub_ctx
*sctx
)
299 struct btrfs_fs_info
*fs_info
= sctx
->dev_root
->fs_info
;
302 * see scrub_pending_trans_workers_inc() why we're pretending
303 * to be paused in the scrub counters
305 mutex_lock(&fs_info
->scrub_lock
);
306 atomic_dec(&fs_info
->scrubs_running
);
307 atomic_dec(&fs_info
->scrubs_paused
);
308 mutex_unlock(&fs_info
->scrub_lock
);
309 atomic_dec(&sctx
->workers_pending
);
310 wake_up(&fs_info
->scrub_pause_wait
);
311 wake_up(&sctx
->list_wait
);
314 static void scrub_free_csums(struct scrub_ctx
*sctx
)
316 while (!list_empty(&sctx
->csum_list
)) {
317 struct btrfs_ordered_sum
*sum
;
318 sum
= list_first_entry(&sctx
->csum_list
,
319 struct btrfs_ordered_sum
, list
);
320 list_del(&sum
->list
);
325 static noinline_for_stack
void scrub_free_ctx(struct scrub_ctx
*sctx
)
332 scrub_free_wr_ctx(&sctx
->wr_ctx
);
334 /* this can happen when scrub is cancelled */
335 if (sctx
->curr
!= -1) {
336 struct scrub_bio
*sbio
= sctx
->bios
[sctx
->curr
];
338 for (i
= 0; i
< sbio
->page_count
; i
++) {
339 WARN_ON(!sbio
->pagev
[i
]->page
);
340 scrub_block_put(sbio
->pagev
[i
]->sblock
);
345 for (i
= 0; i
< SCRUB_BIOS_PER_SCTX
; ++i
) {
346 struct scrub_bio
*sbio
= sctx
->bios
[i
];
353 scrub_free_csums(sctx
);
357 static noinline_for_stack
358 struct scrub_ctx
*scrub_setup_ctx(struct btrfs_device
*dev
, int is_dev_replace
)
360 struct scrub_ctx
*sctx
;
362 struct btrfs_fs_info
*fs_info
= dev
->dev_root
->fs_info
;
363 int pages_per_rd_bio
;
367 * the setting of pages_per_rd_bio is correct for scrub but might
368 * be wrong for the dev_replace code where we might read from
369 * different devices in the initial huge bios. However, that
370 * code is able to correctly handle the case when adding a page
374 pages_per_rd_bio
= min_t(int, SCRUB_PAGES_PER_RD_BIO
,
375 bio_get_nr_vecs(dev
->bdev
));
377 pages_per_rd_bio
= SCRUB_PAGES_PER_RD_BIO
;
378 sctx
= kzalloc(sizeof(*sctx
), GFP_NOFS
);
381 sctx
->is_dev_replace
= is_dev_replace
;
382 sctx
->pages_per_rd_bio
= pages_per_rd_bio
;
384 sctx
->dev_root
= dev
->dev_root
;
385 for (i
= 0; i
< SCRUB_BIOS_PER_SCTX
; ++i
) {
386 struct scrub_bio
*sbio
;
388 sbio
= kzalloc(sizeof(*sbio
), GFP_NOFS
);
391 sctx
->bios
[i
] = sbio
;
395 sbio
->page_count
= 0;
396 sbio
->work
.func
= scrub_bio_end_io_worker
;
398 if (i
!= SCRUB_BIOS_PER_SCTX
- 1)
399 sctx
->bios
[i
]->next_free
= i
+ 1;
401 sctx
->bios
[i
]->next_free
= -1;
403 sctx
->first_free
= 0;
404 sctx
->nodesize
= dev
->dev_root
->nodesize
;
405 sctx
->leafsize
= dev
->dev_root
->leafsize
;
406 sctx
->sectorsize
= dev
->dev_root
->sectorsize
;
407 atomic_set(&sctx
->bios_in_flight
, 0);
408 atomic_set(&sctx
->workers_pending
, 0);
409 atomic_set(&sctx
->cancel_req
, 0);
410 sctx
->csum_size
= btrfs_super_csum_size(fs_info
->super_copy
);
411 INIT_LIST_HEAD(&sctx
->csum_list
);
413 spin_lock_init(&sctx
->list_lock
);
414 spin_lock_init(&sctx
->stat_lock
);
415 init_waitqueue_head(&sctx
->list_wait
);
417 ret
= scrub_setup_wr_ctx(sctx
, &sctx
->wr_ctx
, fs_info
,
418 fs_info
->dev_replace
.tgtdev
, is_dev_replace
);
420 scrub_free_ctx(sctx
);
426 scrub_free_ctx(sctx
);
427 return ERR_PTR(-ENOMEM
);
430 static int scrub_print_warning_inode(u64 inum
, u64 offset
, u64 root
,
437 struct extent_buffer
*eb
;
438 struct btrfs_inode_item
*inode_item
;
439 struct scrub_warning
*swarn
= warn_ctx
;
440 struct btrfs_fs_info
*fs_info
= swarn
->dev
->dev_root
->fs_info
;
441 struct inode_fs_paths
*ipath
= NULL
;
442 struct btrfs_root
*local_root
;
443 struct btrfs_key root_key
;
445 root_key
.objectid
= root
;
446 root_key
.type
= BTRFS_ROOT_ITEM_KEY
;
447 root_key
.offset
= (u64
)-1;
448 local_root
= btrfs_read_fs_root_no_name(fs_info
, &root_key
);
449 if (IS_ERR(local_root
)) {
450 ret
= PTR_ERR(local_root
);
454 ret
= inode_item_info(inum
, 0, local_root
, swarn
->path
);
456 btrfs_release_path(swarn
->path
);
460 eb
= swarn
->path
->nodes
[0];
461 inode_item
= btrfs_item_ptr(eb
, swarn
->path
->slots
[0],
462 struct btrfs_inode_item
);
463 isize
= btrfs_inode_size(eb
, inode_item
);
464 nlink
= btrfs_inode_nlink(eb
, inode_item
);
465 btrfs_release_path(swarn
->path
);
467 ipath
= init_ipath(4096, local_root
, swarn
->path
);
469 ret
= PTR_ERR(ipath
);
473 ret
= paths_from_inode(inum
, ipath
);
479 * we deliberately ignore the bit ipath might have been too small to
480 * hold all of the paths here
482 for (i
= 0; i
< ipath
->fspath
->elem_cnt
; ++i
)
483 printk_in_rcu(KERN_WARNING
"btrfs: %s at logical %llu on dev "
484 "%s, sector %llu, root %llu, inode %llu, offset %llu, "
485 "length %llu, links %u (path: %s)\n", swarn
->errstr
,
486 swarn
->logical
, rcu_str_deref(swarn
->dev
->name
),
487 (unsigned long long)swarn
->sector
, root
, inum
, offset
,
488 min(isize
- offset
, (u64
)PAGE_SIZE
), nlink
,
489 (char *)(unsigned long)ipath
->fspath
->val
[i
]);
495 printk_in_rcu(KERN_WARNING
"btrfs: %s at logical %llu on dev "
496 "%s, sector %llu, root %llu, inode %llu, offset %llu: path "
497 "resolving failed with ret=%d\n", swarn
->errstr
,
498 swarn
->logical
, rcu_str_deref(swarn
->dev
->name
),
499 (unsigned long long)swarn
->sector
, root
, inum
, offset
, ret
);
505 static void scrub_print_warning(const char *errstr
, struct scrub_block
*sblock
)
507 struct btrfs_device
*dev
;
508 struct btrfs_fs_info
*fs_info
;
509 struct btrfs_path
*path
;
510 struct btrfs_key found_key
;
511 struct extent_buffer
*eb
;
512 struct btrfs_extent_item
*ei
;
513 struct scrub_warning swarn
;
514 unsigned long ptr
= 0;
520 const int bufsize
= 4096;
523 WARN_ON(sblock
->page_count
< 1);
524 dev
= sblock
->pagev
[0]->dev
;
525 fs_info
= sblock
->sctx
->dev_root
->fs_info
;
527 path
= btrfs_alloc_path();
529 swarn
.scratch_buf
= kmalloc(bufsize
, GFP_NOFS
);
530 swarn
.msg_buf
= kmalloc(bufsize
, GFP_NOFS
);
531 swarn
.sector
= (sblock
->pagev
[0]->physical
) >> 9;
532 swarn
.logical
= sblock
->pagev
[0]->logical
;
533 swarn
.errstr
= errstr
;
535 swarn
.msg_bufsize
= bufsize
;
536 swarn
.scratch_bufsize
= bufsize
;
538 if (!path
|| !swarn
.scratch_buf
|| !swarn
.msg_buf
)
541 ret
= extent_from_logical(fs_info
, swarn
.logical
, path
, &found_key
,
546 extent_item_pos
= swarn
.logical
- found_key
.objectid
;
547 swarn
.extent_item_size
= found_key
.offset
;
550 ei
= btrfs_item_ptr(eb
, path
->slots
[0], struct btrfs_extent_item
);
551 item_size
= btrfs_item_size_nr(eb
, path
->slots
[0]);
553 if (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
) {
555 ret
= tree_backref_for_extent(&ptr
, eb
, ei
, item_size
,
556 &ref_root
, &ref_level
);
557 printk_in_rcu(KERN_WARNING
558 "btrfs: %s at logical %llu on dev %s, "
559 "sector %llu: metadata %s (level %d) in tree "
560 "%llu\n", errstr
, swarn
.logical
,
561 rcu_str_deref(dev
->name
),
562 (unsigned long long)swarn
.sector
,
563 ref_level
? "node" : "leaf",
564 ret
< 0 ? -1 : ref_level
,
565 ret
< 0 ? -1 : ref_root
);
567 btrfs_release_path(path
);
569 btrfs_release_path(path
);
572 iterate_extent_inodes(fs_info
, found_key
.objectid
,
574 scrub_print_warning_inode
, &swarn
);
578 btrfs_free_path(path
);
579 kfree(swarn
.scratch_buf
);
580 kfree(swarn
.msg_buf
);
583 static int scrub_fixup_readpage(u64 inum
, u64 offset
, u64 root
, void *fixup_ctx
)
585 struct page
*page
= NULL
;
587 struct scrub_fixup_nodatasum
*fixup
= fixup_ctx
;
590 struct btrfs_key key
;
591 struct inode
*inode
= NULL
;
592 struct btrfs_fs_info
*fs_info
;
593 u64 end
= offset
+ PAGE_SIZE
- 1;
594 struct btrfs_root
*local_root
;
598 key
.type
= BTRFS_ROOT_ITEM_KEY
;
599 key
.offset
= (u64
)-1;
601 fs_info
= fixup
->root
->fs_info
;
602 srcu_index
= srcu_read_lock(&fs_info
->subvol_srcu
);
604 local_root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
605 if (IS_ERR(local_root
)) {
606 srcu_read_unlock(&fs_info
->subvol_srcu
, srcu_index
);
607 return PTR_ERR(local_root
);
610 key
.type
= BTRFS_INODE_ITEM_KEY
;
613 inode
= btrfs_iget(fs_info
->sb
, &key
, local_root
, NULL
);
614 srcu_read_unlock(&fs_info
->subvol_srcu
, srcu_index
);
616 return PTR_ERR(inode
);
618 index
= offset
>> PAGE_CACHE_SHIFT
;
620 page
= find_or_create_page(inode
->i_mapping
, index
, GFP_NOFS
);
626 if (PageUptodate(page
)) {
627 if (PageDirty(page
)) {
629 * we need to write the data to the defect sector. the
630 * data that was in that sector is not in memory,
631 * because the page was modified. we must not write the
632 * modified page to that sector.
634 * TODO: what could be done here: wait for the delalloc
635 * runner to write out that page (might involve
636 * COW) and see whether the sector is still
637 * referenced afterwards.
639 * For the meantime, we'll treat this error
640 * incorrectable, although there is a chance that a
641 * later scrub will find the bad sector again and that
642 * there's no dirty page in memory, then.
647 fs_info
= BTRFS_I(inode
)->root
->fs_info
;
648 ret
= repair_io_failure(fs_info
, offset
, PAGE_SIZE
,
649 fixup
->logical
, page
,
655 * we need to get good data first. the general readpage path
656 * will call repair_io_failure for us, we just have to make
657 * sure we read the bad mirror.
659 ret
= set_extent_bits(&BTRFS_I(inode
)->io_tree
, offset
, end
,
660 EXTENT_DAMAGED
, GFP_NOFS
);
662 /* set_extent_bits should give proper error */
669 ret
= extent_read_full_page(&BTRFS_I(inode
)->io_tree
, page
,
672 wait_on_page_locked(page
);
674 corrected
= !test_range_bit(&BTRFS_I(inode
)->io_tree
, offset
,
675 end
, EXTENT_DAMAGED
, 0, NULL
);
677 clear_extent_bits(&BTRFS_I(inode
)->io_tree
, offset
, end
,
678 EXTENT_DAMAGED
, GFP_NOFS
);
690 if (ret
== 0 && corrected
) {
692 * we only need to call readpage for one of the inodes belonging
693 * to this extent. so make iterate_extent_inodes stop
701 static void scrub_fixup_nodatasum(struct btrfs_work
*work
)
704 struct scrub_fixup_nodatasum
*fixup
;
705 struct scrub_ctx
*sctx
;
706 struct btrfs_trans_handle
*trans
= NULL
;
707 struct btrfs_fs_info
*fs_info
;
708 struct btrfs_path
*path
;
709 int uncorrectable
= 0;
711 fixup
= container_of(work
, struct scrub_fixup_nodatasum
, work
);
713 fs_info
= fixup
->root
->fs_info
;
715 path
= btrfs_alloc_path();
717 spin_lock(&sctx
->stat_lock
);
718 ++sctx
->stat
.malloc_errors
;
719 spin_unlock(&sctx
->stat_lock
);
724 trans
= btrfs_join_transaction(fixup
->root
);
731 * the idea is to trigger a regular read through the standard path. we
732 * read a page from the (failed) logical address by specifying the
733 * corresponding copynum of the failed sector. thus, that readpage is
735 * that is the point where on-the-fly error correction will kick in
736 * (once it's finished) and rewrite the failed sector if a good copy
739 ret
= iterate_inodes_from_logical(fixup
->logical
, fixup
->root
->fs_info
,
740 path
, scrub_fixup_readpage
,
748 spin_lock(&sctx
->stat_lock
);
749 ++sctx
->stat
.corrected_errors
;
750 spin_unlock(&sctx
->stat_lock
);
753 if (trans
&& !IS_ERR(trans
))
754 btrfs_end_transaction(trans
, fixup
->root
);
756 spin_lock(&sctx
->stat_lock
);
757 ++sctx
->stat
.uncorrectable_errors
;
758 spin_unlock(&sctx
->stat_lock
);
759 btrfs_dev_replace_stats_inc(
760 &sctx
->dev_root
->fs_info
->dev_replace
.
761 num_uncorrectable_read_errors
);
762 printk_ratelimited_in_rcu(KERN_ERR
763 "btrfs: unable to fixup (nodatasum) error at logical %llu on dev %s\n",
764 fixup
->logical
, rcu_str_deref(fixup
->dev
->name
));
767 btrfs_free_path(path
);
770 scrub_pending_trans_workers_dec(sctx
);
774 * scrub_handle_errored_block gets called when either verification of the
775 * pages failed or the bio failed to read, e.g. with EIO. In the latter
776 * case, this function handles all pages in the bio, even though only one
778 * The goal of this function is to repair the errored block by using the
779 * contents of one of the mirrors.
781 static int scrub_handle_errored_block(struct scrub_block
*sblock_to_check
)
783 struct scrub_ctx
*sctx
= sblock_to_check
->sctx
;
784 struct btrfs_device
*dev
;
785 struct btrfs_fs_info
*fs_info
;
789 unsigned int failed_mirror_index
;
790 unsigned int is_metadata
;
791 unsigned int have_csum
;
793 struct scrub_block
*sblocks_for_recheck
; /* holds one for each mirror */
794 struct scrub_block
*sblock_bad
;
799 static DEFINE_RATELIMIT_STATE(_rs
, DEFAULT_RATELIMIT_INTERVAL
,
800 DEFAULT_RATELIMIT_BURST
);
802 BUG_ON(sblock_to_check
->page_count
< 1);
803 fs_info
= sctx
->dev_root
->fs_info
;
804 if (sblock_to_check
->pagev
[0]->flags
& BTRFS_EXTENT_FLAG_SUPER
) {
806 * if we find an error in a super block, we just report it.
807 * They will get written with the next transaction commit
810 spin_lock(&sctx
->stat_lock
);
811 ++sctx
->stat
.super_errors
;
812 spin_unlock(&sctx
->stat_lock
);
815 length
= sblock_to_check
->page_count
* PAGE_SIZE
;
816 logical
= sblock_to_check
->pagev
[0]->logical
;
817 generation
= sblock_to_check
->pagev
[0]->generation
;
818 BUG_ON(sblock_to_check
->pagev
[0]->mirror_num
< 1);
819 failed_mirror_index
= sblock_to_check
->pagev
[0]->mirror_num
- 1;
820 is_metadata
= !(sblock_to_check
->pagev
[0]->flags
&
821 BTRFS_EXTENT_FLAG_DATA
);
822 have_csum
= sblock_to_check
->pagev
[0]->have_csum
;
823 csum
= sblock_to_check
->pagev
[0]->csum
;
824 dev
= sblock_to_check
->pagev
[0]->dev
;
826 if (sctx
->is_dev_replace
&& !is_metadata
&& !have_csum
) {
827 sblocks_for_recheck
= NULL
;
832 * read all mirrors one after the other. This includes to
833 * re-read the extent or metadata block that failed (that was
834 * the cause that this fixup code is called) another time,
835 * page by page this time in order to know which pages
836 * caused I/O errors and which ones are good (for all mirrors).
837 * It is the goal to handle the situation when more than one
838 * mirror contains I/O errors, but the errors do not
839 * overlap, i.e. the data can be repaired by selecting the
840 * pages from those mirrors without I/O error on the
841 * particular pages. One example (with blocks >= 2 * PAGE_SIZE)
842 * would be that mirror #1 has an I/O error on the first page,
843 * the second page is good, and mirror #2 has an I/O error on
844 * the second page, but the first page is good.
845 * Then the first page of the first mirror can be repaired by
846 * taking the first page of the second mirror, and the
847 * second page of the second mirror can be repaired by
848 * copying the contents of the 2nd page of the 1st mirror.
849 * One more note: if the pages of one mirror contain I/O
850 * errors, the checksum cannot be verified. In order to get
851 * the best data for repairing, the first attempt is to find
852 * a mirror without I/O errors and with a validated checksum.
853 * Only if this is not possible, the pages are picked from
854 * mirrors with I/O errors without considering the checksum.
855 * If the latter is the case, at the end, the checksum of the
856 * repaired area is verified in order to correctly maintain
860 sblocks_for_recheck
= kzalloc(BTRFS_MAX_MIRRORS
*
861 sizeof(*sblocks_for_recheck
),
863 if (!sblocks_for_recheck
) {
864 spin_lock(&sctx
->stat_lock
);
865 sctx
->stat
.malloc_errors
++;
866 sctx
->stat
.read_errors
++;
867 sctx
->stat
.uncorrectable_errors
++;
868 spin_unlock(&sctx
->stat_lock
);
869 btrfs_dev_stat_inc_and_print(dev
, BTRFS_DEV_STAT_READ_ERRS
);
873 /* setup the context, map the logical blocks and alloc the pages */
874 ret
= scrub_setup_recheck_block(sctx
, fs_info
, sblock_to_check
, length
,
875 logical
, sblocks_for_recheck
);
877 spin_lock(&sctx
->stat_lock
);
878 sctx
->stat
.read_errors
++;
879 sctx
->stat
.uncorrectable_errors
++;
880 spin_unlock(&sctx
->stat_lock
);
881 btrfs_dev_stat_inc_and_print(dev
, BTRFS_DEV_STAT_READ_ERRS
);
884 BUG_ON(failed_mirror_index
>= BTRFS_MAX_MIRRORS
);
885 sblock_bad
= sblocks_for_recheck
+ failed_mirror_index
;
887 /* build and submit the bios for the failed mirror, check checksums */
888 scrub_recheck_block(fs_info
, sblock_bad
, is_metadata
, have_csum
,
889 csum
, generation
, sctx
->csum_size
);
891 if (!sblock_bad
->header_error
&& !sblock_bad
->checksum_error
&&
892 sblock_bad
->no_io_error_seen
) {
894 * the error disappeared after reading page by page, or
895 * the area was part of a huge bio and other parts of the
896 * bio caused I/O errors, or the block layer merged several
897 * read requests into one and the error is caused by a
898 * different bio (usually one of the two latter cases is
901 spin_lock(&sctx
->stat_lock
);
902 sctx
->stat
.unverified_errors
++;
903 spin_unlock(&sctx
->stat_lock
);
905 if (sctx
->is_dev_replace
)
906 scrub_write_block_to_dev_replace(sblock_bad
);
910 if (!sblock_bad
->no_io_error_seen
) {
911 spin_lock(&sctx
->stat_lock
);
912 sctx
->stat
.read_errors
++;
913 spin_unlock(&sctx
->stat_lock
);
914 if (__ratelimit(&_rs
))
915 scrub_print_warning("i/o error", sblock_to_check
);
916 btrfs_dev_stat_inc_and_print(dev
, BTRFS_DEV_STAT_READ_ERRS
);
917 } else if (sblock_bad
->checksum_error
) {
918 spin_lock(&sctx
->stat_lock
);
919 sctx
->stat
.csum_errors
++;
920 spin_unlock(&sctx
->stat_lock
);
921 if (__ratelimit(&_rs
))
922 scrub_print_warning("checksum error", sblock_to_check
);
923 btrfs_dev_stat_inc_and_print(dev
,
924 BTRFS_DEV_STAT_CORRUPTION_ERRS
);
925 } else if (sblock_bad
->header_error
) {
926 spin_lock(&sctx
->stat_lock
);
927 sctx
->stat
.verify_errors
++;
928 spin_unlock(&sctx
->stat_lock
);
929 if (__ratelimit(&_rs
))
930 scrub_print_warning("checksum/header error",
932 if (sblock_bad
->generation_error
)
933 btrfs_dev_stat_inc_and_print(dev
,
934 BTRFS_DEV_STAT_GENERATION_ERRS
);
936 btrfs_dev_stat_inc_and_print(dev
,
937 BTRFS_DEV_STAT_CORRUPTION_ERRS
);
940 if (sctx
->readonly
) {
941 ASSERT(!sctx
->is_dev_replace
);
945 if (!is_metadata
&& !have_csum
) {
946 struct scrub_fixup_nodatasum
*fixup_nodatasum
;
949 WARN_ON(sctx
->is_dev_replace
);
952 * !is_metadata and !have_csum, this means that the data
953 * might not be COW'ed, that it might be modified
954 * concurrently. The general strategy to work on the
955 * commit root does not help in the case when COW is not
958 fixup_nodatasum
= kzalloc(sizeof(*fixup_nodatasum
), GFP_NOFS
);
959 if (!fixup_nodatasum
)
960 goto did_not_correct_error
;
961 fixup_nodatasum
->sctx
= sctx
;
962 fixup_nodatasum
->dev
= dev
;
963 fixup_nodatasum
->logical
= logical
;
964 fixup_nodatasum
->root
= fs_info
->extent_root
;
965 fixup_nodatasum
->mirror_num
= failed_mirror_index
+ 1;
966 scrub_pending_trans_workers_inc(sctx
);
967 fixup_nodatasum
->work
.func
= scrub_fixup_nodatasum
;
968 btrfs_queue_worker(&fs_info
->scrub_workers
,
969 &fixup_nodatasum
->work
);
974 * now build and submit the bios for the other mirrors, check
976 * First try to pick the mirror which is completely without I/O
977 * errors and also does not have a checksum error.
978 * If one is found, and if a checksum is present, the full block
979 * that is known to contain an error is rewritten. Afterwards
980 * the block is known to be corrected.
981 * If a mirror is found which is completely correct, and no
982 * checksum is present, only those pages are rewritten that had
983 * an I/O error in the block to be repaired, since it cannot be
984 * determined, which copy of the other pages is better (and it
985 * could happen otherwise that a correct page would be
986 * overwritten by a bad one).
988 for (mirror_index
= 0;
989 mirror_index
< BTRFS_MAX_MIRRORS
&&
990 sblocks_for_recheck
[mirror_index
].page_count
> 0;
992 struct scrub_block
*sblock_other
;
994 if (mirror_index
== failed_mirror_index
)
996 sblock_other
= sblocks_for_recheck
+ mirror_index
;
998 /* build and submit the bios, check checksums */
999 scrub_recheck_block(fs_info
, sblock_other
, is_metadata
,
1000 have_csum
, csum
, generation
,
1003 if (!sblock_other
->header_error
&&
1004 !sblock_other
->checksum_error
&&
1005 sblock_other
->no_io_error_seen
) {
1006 if (sctx
->is_dev_replace
) {
1007 scrub_write_block_to_dev_replace(sblock_other
);
1009 int force_write
= is_metadata
|| have_csum
;
1011 ret
= scrub_repair_block_from_good_copy(
1012 sblock_bad
, sblock_other
,
1016 goto corrected_error
;
1021 * for dev_replace, pick good pages and write to the target device.
1023 if (sctx
->is_dev_replace
) {
1025 for (page_num
= 0; page_num
< sblock_bad
->page_count
;
1030 for (mirror_index
= 0;
1031 mirror_index
< BTRFS_MAX_MIRRORS
&&
1032 sblocks_for_recheck
[mirror_index
].page_count
> 0;
1034 struct scrub_block
*sblock_other
=
1035 sblocks_for_recheck
+ mirror_index
;
1036 struct scrub_page
*page_other
=
1037 sblock_other
->pagev
[page_num
];
1039 if (!page_other
->io_error
) {
1040 ret
= scrub_write_page_to_dev_replace(
1041 sblock_other
, page_num
);
1043 /* succeeded for this page */
1047 btrfs_dev_replace_stats_inc(
1049 fs_info
->dev_replace
.
1057 * did not find a mirror to fetch the page
1058 * from. scrub_write_page_to_dev_replace()
1059 * handles this case (page->io_error), by
1060 * filling the block with zeros before
1061 * submitting the write request
1064 ret
= scrub_write_page_to_dev_replace(
1065 sblock_bad
, page_num
);
1067 btrfs_dev_replace_stats_inc(
1068 &sctx
->dev_root
->fs_info
->
1069 dev_replace
.num_write_errors
);
1077 * for regular scrub, repair those pages that are errored.
1078 * In case of I/O errors in the area that is supposed to be
1079 * repaired, continue by picking good copies of those pages.
1080 * Select the good pages from mirrors to rewrite bad pages from
1081 * the area to fix. Afterwards verify the checksum of the block
1082 * that is supposed to be repaired. This verification step is
1083 * only done for the purpose of statistic counting and for the
1084 * final scrub report, whether errors remain.
1085 * A perfect algorithm could make use of the checksum and try
1086 * all possible combinations of pages from the different mirrors
1087 * until the checksum verification succeeds. For example, when
1088 * the 2nd page of mirror #1 faces I/O errors, and the 2nd page
1089 * of mirror #2 is readable but the final checksum test fails,
1090 * then the 2nd page of mirror #3 could be tried, whether now
1091 * the final checksum succeedes. But this would be a rare
1092 * exception and is therefore not implemented. At least it is
1093 * avoided that the good copy is overwritten.
1094 * A more useful improvement would be to pick the sectors
1095 * without I/O error based on sector sizes (512 bytes on legacy
1096 * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one
1097 * mirror could be repaired by taking 512 byte of a different
1098 * mirror, even if other 512 byte sectors in the same PAGE_SIZE
1099 * area are unreadable.
1102 /* can only fix I/O errors from here on */
1103 if (sblock_bad
->no_io_error_seen
)
1104 goto did_not_correct_error
;
1107 for (page_num
= 0; page_num
< sblock_bad
->page_count
; page_num
++) {
1108 struct scrub_page
*page_bad
= sblock_bad
->pagev
[page_num
];
1110 if (!page_bad
->io_error
)
1113 for (mirror_index
= 0;
1114 mirror_index
< BTRFS_MAX_MIRRORS
&&
1115 sblocks_for_recheck
[mirror_index
].page_count
> 0;
1117 struct scrub_block
*sblock_other
= sblocks_for_recheck
+
1119 struct scrub_page
*page_other
= sblock_other
->pagev
[
1122 if (!page_other
->io_error
) {
1123 ret
= scrub_repair_page_from_good_copy(
1124 sblock_bad
, sblock_other
, page_num
, 0);
1126 page_bad
->io_error
= 0;
1127 break; /* succeeded for this page */
1132 if (page_bad
->io_error
) {
1133 /* did not find a mirror to copy the page from */
1139 if (is_metadata
|| have_csum
) {
1141 * need to verify the checksum now that all
1142 * sectors on disk are repaired (the write
1143 * request for data to be repaired is on its way).
1144 * Just be lazy and use scrub_recheck_block()
1145 * which re-reads the data before the checksum
1146 * is verified, but most likely the data comes out
1147 * of the page cache.
1149 scrub_recheck_block(fs_info
, sblock_bad
,
1150 is_metadata
, have_csum
, csum
,
1151 generation
, sctx
->csum_size
);
1152 if (!sblock_bad
->header_error
&&
1153 !sblock_bad
->checksum_error
&&
1154 sblock_bad
->no_io_error_seen
)
1155 goto corrected_error
;
1157 goto did_not_correct_error
;
1160 spin_lock(&sctx
->stat_lock
);
1161 sctx
->stat
.corrected_errors
++;
1162 spin_unlock(&sctx
->stat_lock
);
1163 printk_ratelimited_in_rcu(KERN_ERR
1164 "btrfs: fixed up error at logical %llu on dev %s\n",
1165 logical
, rcu_str_deref(dev
->name
));
1168 did_not_correct_error
:
1169 spin_lock(&sctx
->stat_lock
);
1170 sctx
->stat
.uncorrectable_errors
++;
1171 spin_unlock(&sctx
->stat_lock
);
1172 printk_ratelimited_in_rcu(KERN_ERR
1173 "btrfs: unable to fixup (regular) error at logical %llu on dev %s\n",
1174 logical
, rcu_str_deref(dev
->name
));
1178 if (sblocks_for_recheck
) {
1179 for (mirror_index
= 0; mirror_index
< BTRFS_MAX_MIRRORS
;
1181 struct scrub_block
*sblock
= sblocks_for_recheck
+
1185 for (page_index
= 0; page_index
< sblock
->page_count
;
1187 sblock
->pagev
[page_index
]->sblock
= NULL
;
1188 scrub_page_put(sblock
->pagev
[page_index
]);
1191 kfree(sblocks_for_recheck
);
1197 static int scrub_setup_recheck_block(struct scrub_ctx
*sctx
,
1198 struct btrfs_fs_info
*fs_info
,
1199 struct scrub_block
*original_sblock
,
1200 u64 length
, u64 logical
,
1201 struct scrub_block
*sblocks_for_recheck
)
1208 * note: the two members ref_count and outstanding_pages
1209 * are not used (and not set) in the blocks that are used for
1210 * the recheck procedure
1214 while (length
> 0) {
1215 u64 sublen
= min_t(u64
, length
, PAGE_SIZE
);
1216 u64 mapped_length
= sublen
;
1217 struct btrfs_bio
*bbio
= NULL
;
1220 * with a length of PAGE_SIZE, each returned stripe
1221 * represents one mirror
1223 ret
= btrfs_map_block(fs_info
, REQ_GET_READ_MIRRORS
, logical
,
1224 &mapped_length
, &bbio
, 0);
1225 if (ret
|| !bbio
|| mapped_length
< sublen
) {
1230 BUG_ON(page_index
>= SCRUB_PAGES_PER_RD_BIO
);
1231 for (mirror_index
= 0; mirror_index
< (int)bbio
->num_stripes
;
1233 struct scrub_block
*sblock
;
1234 struct scrub_page
*page
;
1236 if (mirror_index
>= BTRFS_MAX_MIRRORS
)
1239 sblock
= sblocks_for_recheck
+ mirror_index
;
1240 sblock
->sctx
= sctx
;
1241 page
= kzalloc(sizeof(*page
), GFP_NOFS
);
1244 spin_lock(&sctx
->stat_lock
);
1245 sctx
->stat
.malloc_errors
++;
1246 spin_unlock(&sctx
->stat_lock
);
1250 scrub_page_get(page
);
1251 sblock
->pagev
[page_index
] = page
;
1252 page
->logical
= logical
;
1253 page
->physical
= bbio
->stripes
[mirror_index
].physical
;
1254 BUG_ON(page_index
>= original_sblock
->page_count
);
1255 page
->physical_for_dev_replace
=
1256 original_sblock
->pagev
[page_index
]->
1257 physical_for_dev_replace
;
1258 /* for missing devices, dev->bdev is NULL */
1259 page
->dev
= bbio
->stripes
[mirror_index
].dev
;
1260 page
->mirror_num
= mirror_index
+ 1;
1261 sblock
->page_count
++;
1262 page
->page
= alloc_page(GFP_NOFS
);
1276 * this function will check the on disk data for checksum errors, header
1277 * errors and read I/O errors. If any I/O errors happen, the exact pages
1278 * which are errored are marked as being bad. The goal is to enable scrub
1279 * to take those pages that are not errored from all the mirrors so that
1280 * the pages that are errored in the just handled mirror can be repaired.
1282 static void scrub_recheck_block(struct btrfs_fs_info
*fs_info
,
1283 struct scrub_block
*sblock
, int is_metadata
,
1284 int have_csum
, u8
*csum
, u64 generation
,
1289 sblock
->no_io_error_seen
= 1;
1290 sblock
->header_error
= 0;
1291 sblock
->checksum_error
= 0;
1293 for (page_num
= 0; page_num
< sblock
->page_count
; page_num
++) {
1295 struct scrub_page
*page
= sblock
->pagev
[page_num
];
1297 if (page
->dev
->bdev
== NULL
) {
1299 sblock
->no_io_error_seen
= 0;
1303 WARN_ON(!page
->page
);
1304 bio
= btrfs_io_bio_alloc(GFP_NOFS
, 1);
1307 sblock
->no_io_error_seen
= 0;
1310 bio
->bi_bdev
= page
->dev
->bdev
;
1311 bio
->bi_sector
= page
->physical
>> 9;
1313 bio_add_page(bio
, page
->page
, PAGE_SIZE
, 0);
1314 if (btrfsic_submit_bio_wait(READ
, bio
))
1315 sblock
->no_io_error_seen
= 0;
1320 if (sblock
->no_io_error_seen
)
1321 scrub_recheck_block_checksum(fs_info
, sblock
, is_metadata
,
1322 have_csum
, csum
, generation
,
1328 static void scrub_recheck_block_checksum(struct btrfs_fs_info
*fs_info
,
1329 struct scrub_block
*sblock
,
1330 int is_metadata
, int have_csum
,
1331 const u8
*csum
, u64 generation
,
1335 u8 calculated_csum
[BTRFS_CSUM_SIZE
];
1337 void *mapped_buffer
;
1339 WARN_ON(!sblock
->pagev
[0]->page
);
1341 struct btrfs_header
*h
;
1343 mapped_buffer
= kmap_atomic(sblock
->pagev
[0]->page
);
1344 h
= (struct btrfs_header
*)mapped_buffer
;
1346 if (sblock
->pagev
[0]->logical
!= btrfs_stack_header_bytenr(h
) ||
1347 memcmp(h
->fsid
, fs_info
->fsid
, BTRFS_UUID_SIZE
) ||
1348 memcmp(h
->chunk_tree_uuid
, fs_info
->chunk_tree_uuid
,
1350 sblock
->header_error
= 1;
1351 } else if (generation
!= btrfs_stack_header_generation(h
)) {
1352 sblock
->header_error
= 1;
1353 sblock
->generation_error
= 1;
1360 mapped_buffer
= kmap_atomic(sblock
->pagev
[0]->page
);
1363 for (page_num
= 0;;) {
1364 if (page_num
== 0 && is_metadata
)
1365 crc
= btrfs_csum_data(
1366 ((u8
*)mapped_buffer
) + BTRFS_CSUM_SIZE
,
1367 crc
, PAGE_SIZE
- BTRFS_CSUM_SIZE
);
1369 crc
= btrfs_csum_data(mapped_buffer
, crc
, PAGE_SIZE
);
1371 kunmap_atomic(mapped_buffer
);
1373 if (page_num
>= sblock
->page_count
)
1375 WARN_ON(!sblock
->pagev
[page_num
]->page
);
1377 mapped_buffer
= kmap_atomic(sblock
->pagev
[page_num
]->page
);
1380 btrfs_csum_final(crc
, calculated_csum
);
1381 if (memcmp(calculated_csum
, csum
, csum_size
))
1382 sblock
->checksum_error
= 1;
1385 static int scrub_repair_block_from_good_copy(struct scrub_block
*sblock_bad
,
1386 struct scrub_block
*sblock_good
,
1392 for (page_num
= 0; page_num
< sblock_bad
->page_count
; page_num
++) {
1395 ret_sub
= scrub_repair_page_from_good_copy(sblock_bad
,
1406 static int scrub_repair_page_from_good_copy(struct scrub_block
*sblock_bad
,
1407 struct scrub_block
*sblock_good
,
1408 int page_num
, int force_write
)
1410 struct scrub_page
*page_bad
= sblock_bad
->pagev
[page_num
];
1411 struct scrub_page
*page_good
= sblock_good
->pagev
[page_num
];
1413 BUG_ON(page_bad
->page
== NULL
);
1414 BUG_ON(page_good
->page
== NULL
);
1415 if (force_write
|| sblock_bad
->header_error
||
1416 sblock_bad
->checksum_error
|| page_bad
->io_error
) {
1420 if (!page_bad
->dev
->bdev
) {
1421 printk_ratelimited(KERN_WARNING
1422 "btrfs: scrub_repair_page_from_good_copy(bdev == NULL) is unexpected!\n");
1426 bio
= btrfs_io_bio_alloc(GFP_NOFS
, 1);
1429 bio
->bi_bdev
= page_bad
->dev
->bdev
;
1430 bio
->bi_sector
= page_bad
->physical
>> 9;
1432 ret
= bio_add_page(bio
, page_good
->page
, PAGE_SIZE
, 0);
1433 if (PAGE_SIZE
!= ret
) {
1438 if (btrfsic_submit_bio_wait(WRITE
, bio
)) {
1439 btrfs_dev_stat_inc_and_print(page_bad
->dev
,
1440 BTRFS_DEV_STAT_WRITE_ERRS
);
1441 btrfs_dev_replace_stats_inc(
1442 &sblock_bad
->sctx
->dev_root
->fs_info
->
1443 dev_replace
.num_write_errors
);
1453 static void scrub_write_block_to_dev_replace(struct scrub_block
*sblock
)
1457 for (page_num
= 0; page_num
< sblock
->page_count
; page_num
++) {
1460 ret
= scrub_write_page_to_dev_replace(sblock
, page_num
);
1462 btrfs_dev_replace_stats_inc(
1463 &sblock
->sctx
->dev_root
->fs_info
->dev_replace
.
1468 static int scrub_write_page_to_dev_replace(struct scrub_block
*sblock
,
1471 struct scrub_page
*spage
= sblock
->pagev
[page_num
];
1473 BUG_ON(spage
->page
== NULL
);
1474 if (spage
->io_error
) {
1475 void *mapped_buffer
= kmap_atomic(spage
->page
);
1477 memset(mapped_buffer
, 0, PAGE_CACHE_SIZE
);
1478 flush_dcache_page(spage
->page
);
1479 kunmap_atomic(mapped_buffer
);
1481 return scrub_add_page_to_wr_bio(sblock
->sctx
, spage
);
1484 static int scrub_add_page_to_wr_bio(struct scrub_ctx
*sctx
,
1485 struct scrub_page
*spage
)
1487 struct scrub_wr_ctx
*wr_ctx
= &sctx
->wr_ctx
;
1488 struct scrub_bio
*sbio
;
1491 mutex_lock(&wr_ctx
->wr_lock
);
1493 if (!wr_ctx
->wr_curr_bio
) {
1494 wr_ctx
->wr_curr_bio
= kzalloc(sizeof(*wr_ctx
->wr_curr_bio
),
1496 if (!wr_ctx
->wr_curr_bio
) {
1497 mutex_unlock(&wr_ctx
->wr_lock
);
1500 wr_ctx
->wr_curr_bio
->sctx
= sctx
;
1501 wr_ctx
->wr_curr_bio
->page_count
= 0;
1503 sbio
= wr_ctx
->wr_curr_bio
;
1504 if (sbio
->page_count
== 0) {
1507 sbio
->physical
= spage
->physical_for_dev_replace
;
1508 sbio
->logical
= spage
->logical
;
1509 sbio
->dev
= wr_ctx
->tgtdev
;
1512 bio
= btrfs_io_bio_alloc(GFP_NOFS
, wr_ctx
->pages_per_wr_bio
);
1514 mutex_unlock(&wr_ctx
->wr_lock
);
1520 bio
->bi_private
= sbio
;
1521 bio
->bi_end_io
= scrub_wr_bio_end_io
;
1522 bio
->bi_bdev
= sbio
->dev
->bdev
;
1523 bio
->bi_sector
= sbio
->physical
>> 9;
1525 } else if (sbio
->physical
+ sbio
->page_count
* PAGE_SIZE
!=
1526 spage
->physical_for_dev_replace
||
1527 sbio
->logical
+ sbio
->page_count
* PAGE_SIZE
!=
1529 scrub_wr_submit(sctx
);
1533 ret
= bio_add_page(sbio
->bio
, spage
->page
, PAGE_SIZE
, 0);
1534 if (ret
!= PAGE_SIZE
) {
1535 if (sbio
->page_count
< 1) {
1538 mutex_unlock(&wr_ctx
->wr_lock
);
1541 scrub_wr_submit(sctx
);
1545 sbio
->pagev
[sbio
->page_count
] = spage
;
1546 scrub_page_get(spage
);
1548 if (sbio
->page_count
== wr_ctx
->pages_per_wr_bio
)
1549 scrub_wr_submit(sctx
);
1550 mutex_unlock(&wr_ctx
->wr_lock
);
1555 static void scrub_wr_submit(struct scrub_ctx
*sctx
)
1557 struct scrub_wr_ctx
*wr_ctx
= &sctx
->wr_ctx
;
1558 struct scrub_bio
*sbio
;
1560 if (!wr_ctx
->wr_curr_bio
)
1563 sbio
= wr_ctx
->wr_curr_bio
;
1564 wr_ctx
->wr_curr_bio
= NULL
;
1565 WARN_ON(!sbio
->bio
->bi_bdev
);
1566 scrub_pending_bio_inc(sctx
);
1567 /* process all writes in a single worker thread. Then the block layer
1568 * orders the requests before sending them to the driver which
1569 * doubled the write performance on spinning disks when measured
1571 btrfsic_submit_bio(WRITE
, sbio
->bio
);
1574 static void scrub_wr_bio_end_io(struct bio
*bio
, int err
)
1576 struct scrub_bio
*sbio
= bio
->bi_private
;
1577 struct btrfs_fs_info
*fs_info
= sbio
->dev
->dev_root
->fs_info
;
1582 sbio
->work
.func
= scrub_wr_bio_end_io_worker
;
1583 btrfs_queue_worker(&fs_info
->scrub_wr_completion_workers
, &sbio
->work
);
1586 static void scrub_wr_bio_end_io_worker(struct btrfs_work
*work
)
1588 struct scrub_bio
*sbio
= container_of(work
, struct scrub_bio
, work
);
1589 struct scrub_ctx
*sctx
= sbio
->sctx
;
1592 WARN_ON(sbio
->page_count
> SCRUB_PAGES_PER_WR_BIO
);
1594 struct btrfs_dev_replace
*dev_replace
=
1595 &sbio
->sctx
->dev_root
->fs_info
->dev_replace
;
1597 for (i
= 0; i
< sbio
->page_count
; i
++) {
1598 struct scrub_page
*spage
= sbio
->pagev
[i
];
1600 spage
->io_error
= 1;
1601 btrfs_dev_replace_stats_inc(&dev_replace
->
1606 for (i
= 0; i
< sbio
->page_count
; i
++)
1607 scrub_page_put(sbio
->pagev
[i
]);
1611 scrub_pending_bio_dec(sctx
);
1614 static int scrub_checksum(struct scrub_block
*sblock
)
1619 WARN_ON(sblock
->page_count
< 1);
1620 flags
= sblock
->pagev
[0]->flags
;
1622 if (flags
& BTRFS_EXTENT_FLAG_DATA
)
1623 ret
= scrub_checksum_data(sblock
);
1624 else if (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
)
1625 ret
= scrub_checksum_tree_block(sblock
);
1626 else if (flags
& BTRFS_EXTENT_FLAG_SUPER
)
1627 (void)scrub_checksum_super(sblock
);
1631 scrub_handle_errored_block(sblock
);
1636 static int scrub_checksum_data(struct scrub_block
*sblock
)
1638 struct scrub_ctx
*sctx
= sblock
->sctx
;
1639 u8 csum
[BTRFS_CSUM_SIZE
];
1648 BUG_ON(sblock
->page_count
< 1);
1649 if (!sblock
->pagev
[0]->have_csum
)
1652 on_disk_csum
= sblock
->pagev
[0]->csum
;
1653 page
= sblock
->pagev
[0]->page
;
1654 buffer
= kmap_atomic(page
);
1656 len
= sctx
->sectorsize
;
1659 u64 l
= min_t(u64
, len
, PAGE_SIZE
);
1661 crc
= btrfs_csum_data(buffer
, crc
, l
);
1662 kunmap_atomic(buffer
);
1667 BUG_ON(index
>= sblock
->page_count
);
1668 BUG_ON(!sblock
->pagev
[index
]->page
);
1669 page
= sblock
->pagev
[index
]->page
;
1670 buffer
= kmap_atomic(page
);
1673 btrfs_csum_final(crc
, csum
);
1674 if (memcmp(csum
, on_disk_csum
, sctx
->csum_size
))
1680 static int scrub_checksum_tree_block(struct scrub_block
*sblock
)
1682 struct scrub_ctx
*sctx
= sblock
->sctx
;
1683 struct btrfs_header
*h
;
1684 struct btrfs_root
*root
= sctx
->dev_root
;
1685 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1686 u8 calculated_csum
[BTRFS_CSUM_SIZE
];
1687 u8 on_disk_csum
[BTRFS_CSUM_SIZE
];
1689 void *mapped_buffer
;
1698 BUG_ON(sblock
->page_count
< 1);
1699 page
= sblock
->pagev
[0]->page
;
1700 mapped_buffer
= kmap_atomic(page
);
1701 h
= (struct btrfs_header
*)mapped_buffer
;
1702 memcpy(on_disk_csum
, h
->csum
, sctx
->csum_size
);
1705 * we don't use the getter functions here, as we
1706 * a) don't have an extent buffer and
1707 * b) the page is already kmapped
1710 if (sblock
->pagev
[0]->logical
!= btrfs_stack_header_bytenr(h
))
1713 if (sblock
->pagev
[0]->generation
!= btrfs_stack_header_generation(h
))
1716 if (memcmp(h
->fsid
, fs_info
->fsid
, BTRFS_UUID_SIZE
))
1719 if (memcmp(h
->chunk_tree_uuid
, fs_info
->chunk_tree_uuid
,
1723 WARN_ON(sctx
->nodesize
!= sctx
->leafsize
);
1724 len
= sctx
->nodesize
- BTRFS_CSUM_SIZE
;
1725 mapped_size
= PAGE_SIZE
- BTRFS_CSUM_SIZE
;
1726 p
= ((u8
*)mapped_buffer
) + BTRFS_CSUM_SIZE
;
1729 u64 l
= min_t(u64
, len
, mapped_size
);
1731 crc
= btrfs_csum_data(p
, crc
, l
);
1732 kunmap_atomic(mapped_buffer
);
1737 BUG_ON(index
>= sblock
->page_count
);
1738 BUG_ON(!sblock
->pagev
[index
]->page
);
1739 page
= sblock
->pagev
[index
]->page
;
1740 mapped_buffer
= kmap_atomic(page
);
1741 mapped_size
= PAGE_SIZE
;
1745 btrfs_csum_final(crc
, calculated_csum
);
1746 if (memcmp(calculated_csum
, on_disk_csum
, sctx
->csum_size
))
1749 return fail
|| crc_fail
;
1752 static int scrub_checksum_super(struct scrub_block
*sblock
)
1754 struct btrfs_super_block
*s
;
1755 struct scrub_ctx
*sctx
= sblock
->sctx
;
1756 struct btrfs_root
*root
= sctx
->dev_root
;
1757 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1758 u8 calculated_csum
[BTRFS_CSUM_SIZE
];
1759 u8 on_disk_csum
[BTRFS_CSUM_SIZE
];
1761 void *mapped_buffer
;
1770 BUG_ON(sblock
->page_count
< 1);
1771 page
= sblock
->pagev
[0]->page
;
1772 mapped_buffer
= kmap_atomic(page
);
1773 s
= (struct btrfs_super_block
*)mapped_buffer
;
1774 memcpy(on_disk_csum
, s
->csum
, sctx
->csum_size
);
1776 if (sblock
->pagev
[0]->logical
!= btrfs_super_bytenr(s
))
1779 if (sblock
->pagev
[0]->generation
!= btrfs_super_generation(s
))
1782 if (memcmp(s
->fsid
, fs_info
->fsid
, BTRFS_UUID_SIZE
))
1785 len
= BTRFS_SUPER_INFO_SIZE
- BTRFS_CSUM_SIZE
;
1786 mapped_size
= PAGE_SIZE
- BTRFS_CSUM_SIZE
;
1787 p
= ((u8
*)mapped_buffer
) + BTRFS_CSUM_SIZE
;
1790 u64 l
= min_t(u64
, len
, mapped_size
);
1792 crc
= btrfs_csum_data(p
, crc
, l
);
1793 kunmap_atomic(mapped_buffer
);
1798 BUG_ON(index
>= sblock
->page_count
);
1799 BUG_ON(!sblock
->pagev
[index
]->page
);
1800 page
= sblock
->pagev
[index
]->page
;
1801 mapped_buffer
= kmap_atomic(page
);
1802 mapped_size
= PAGE_SIZE
;
1806 btrfs_csum_final(crc
, calculated_csum
);
1807 if (memcmp(calculated_csum
, on_disk_csum
, sctx
->csum_size
))
1810 if (fail_cor
+ fail_gen
) {
1812 * if we find an error in a super block, we just report it.
1813 * They will get written with the next transaction commit
1816 spin_lock(&sctx
->stat_lock
);
1817 ++sctx
->stat
.super_errors
;
1818 spin_unlock(&sctx
->stat_lock
);
1820 btrfs_dev_stat_inc_and_print(sblock
->pagev
[0]->dev
,
1821 BTRFS_DEV_STAT_CORRUPTION_ERRS
);
1823 btrfs_dev_stat_inc_and_print(sblock
->pagev
[0]->dev
,
1824 BTRFS_DEV_STAT_GENERATION_ERRS
);
1827 return fail_cor
+ fail_gen
;
1830 static void scrub_block_get(struct scrub_block
*sblock
)
1832 atomic_inc(&sblock
->ref_count
);
1835 static void scrub_block_put(struct scrub_block
*sblock
)
1837 if (atomic_dec_and_test(&sblock
->ref_count
)) {
1840 for (i
= 0; i
< sblock
->page_count
; i
++)
1841 scrub_page_put(sblock
->pagev
[i
]);
1846 static void scrub_page_get(struct scrub_page
*spage
)
1848 atomic_inc(&spage
->ref_count
);
1851 static void scrub_page_put(struct scrub_page
*spage
)
1853 if (atomic_dec_and_test(&spage
->ref_count
)) {
1855 __free_page(spage
->page
);
1860 static void scrub_submit(struct scrub_ctx
*sctx
)
1862 struct scrub_bio
*sbio
;
1864 if (sctx
->curr
== -1)
1867 sbio
= sctx
->bios
[sctx
->curr
];
1869 scrub_pending_bio_inc(sctx
);
1871 if (!sbio
->bio
->bi_bdev
) {
1873 * this case should not happen. If btrfs_map_block() is
1874 * wrong, it could happen for dev-replace operations on
1875 * missing devices when no mirrors are available, but in
1876 * this case it should already fail the mount.
1877 * This case is handled correctly (but _very_ slowly).
1879 printk_ratelimited(KERN_WARNING
1880 "btrfs: scrub_submit(bio bdev == NULL) is unexpected!\n");
1881 bio_endio(sbio
->bio
, -EIO
);
1883 btrfsic_submit_bio(READ
, sbio
->bio
);
1887 static int scrub_add_page_to_rd_bio(struct scrub_ctx
*sctx
,
1888 struct scrub_page
*spage
)
1890 struct scrub_block
*sblock
= spage
->sblock
;
1891 struct scrub_bio
*sbio
;
1896 * grab a fresh bio or wait for one to become available
1898 while (sctx
->curr
== -1) {
1899 spin_lock(&sctx
->list_lock
);
1900 sctx
->curr
= sctx
->first_free
;
1901 if (sctx
->curr
!= -1) {
1902 sctx
->first_free
= sctx
->bios
[sctx
->curr
]->next_free
;
1903 sctx
->bios
[sctx
->curr
]->next_free
= -1;
1904 sctx
->bios
[sctx
->curr
]->page_count
= 0;
1905 spin_unlock(&sctx
->list_lock
);
1907 spin_unlock(&sctx
->list_lock
);
1908 wait_event(sctx
->list_wait
, sctx
->first_free
!= -1);
1911 sbio
= sctx
->bios
[sctx
->curr
];
1912 if (sbio
->page_count
== 0) {
1915 sbio
->physical
= spage
->physical
;
1916 sbio
->logical
= spage
->logical
;
1917 sbio
->dev
= spage
->dev
;
1920 bio
= btrfs_io_bio_alloc(GFP_NOFS
, sctx
->pages_per_rd_bio
);
1926 bio
->bi_private
= sbio
;
1927 bio
->bi_end_io
= scrub_bio_end_io
;
1928 bio
->bi_bdev
= sbio
->dev
->bdev
;
1929 bio
->bi_sector
= sbio
->physical
>> 9;
1931 } else if (sbio
->physical
+ sbio
->page_count
* PAGE_SIZE
!=
1933 sbio
->logical
+ sbio
->page_count
* PAGE_SIZE
!=
1935 sbio
->dev
!= spage
->dev
) {
1940 sbio
->pagev
[sbio
->page_count
] = spage
;
1941 ret
= bio_add_page(sbio
->bio
, spage
->page
, PAGE_SIZE
, 0);
1942 if (ret
!= PAGE_SIZE
) {
1943 if (sbio
->page_count
< 1) {
1952 scrub_block_get(sblock
); /* one for the page added to the bio */
1953 atomic_inc(&sblock
->outstanding_pages
);
1955 if (sbio
->page_count
== sctx
->pages_per_rd_bio
)
1961 static int scrub_pages(struct scrub_ctx
*sctx
, u64 logical
, u64 len
,
1962 u64 physical
, struct btrfs_device
*dev
, u64 flags
,
1963 u64 gen
, int mirror_num
, u8
*csum
, int force
,
1964 u64 physical_for_dev_replace
)
1966 struct scrub_block
*sblock
;
1969 sblock
= kzalloc(sizeof(*sblock
), GFP_NOFS
);
1971 spin_lock(&sctx
->stat_lock
);
1972 sctx
->stat
.malloc_errors
++;
1973 spin_unlock(&sctx
->stat_lock
);
1977 /* one ref inside this function, plus one for each page added to
1979 atomic_set(&sblock
->ref_count
, 1);
1980 sblock
->sctx
= sctx
;
1981 sblock
->no_io_error_seen
= 1;
1983 for (index
= 0; len
> 0; index
++) {
1984 struct scrub_page
*spage
;
1985 u64 l
= min_t(u64
, len
, PAGE_SIZE
);
1987 spage
= kzalloc(sizeof(*spage
), GFP_NOFS
);
1990 spin_lock(&sctx
->stat_lock
);
1991 sctx
->stat
.malloc_errors
++;
1992 spin_unlock(&sctx
->stat_lock
);
1993 scrub_block_put(sblock
);
1996 BUG_ON(index
>= SCRUB_MAX_PAGES_PER_BLOCK
);
1997 scrub_page_get(spage
);
1998 sblock
->pagev
[index
] = spage
;
1999 spage
->sblock
= sblock
;
2001 spage
->flags
= flags
;
2002 spage
->generation
= gen
;
2003 spage
->logical
= logical
;
2004 spage
->physical
= physical
;
2005 spage
->physical_for_dev_replace
= physical_for_dev_replace
;
2006 spage
->mirror_num
= mirror_num
;
2008 spage
->have_csum
= 1;
2009 memcpy(spage
->csum
, csum
, sctx
->csum_size
);
2011 spage
->have_csum
= 0;
2013 sblock
->page_count
++;
2014 spage
->page
= alloc_page(GFP_NOFS
);
2020 physical_for_dev_replace
+= l
;
2023 WARN_ON(sblock
->page_count
== 0);
2024 for (index
= 0; index
< sblock
->page_count
; index
++) {
2025 struct scrub_page
*spage
= sblock
->pagev
[index
];
2028 ret
= scrub_add_page_to_rd_bio(sctx
, spage
);
2030 scrub_block_put(sblock
);
2038 /* last one frees, either here or in bio completion for last page */
2039 scrub_block_put(sblock
);
2043 static void scrub_bio_end_io(struct bio
*bio
, int err
)
2045 struct scrub_bio
*sbio
= bio
->bi_private
;
2046 struct btrfs_fs_info
*fs_info
= sbio
->dev
->dev_root
->fs_info
;
2051 btrfs_queue_worker(&fs_info
->scrub_workers
, &sbio
->work
);
2054 static void scrub_bio_end_io_worker(struct btrfs_work
*work
)
2056 struct scrub_bio
*sbio
= container_of(work
, struct scrub_bio
, work
);
2057 struct scrub_ctx
*sctx
= sbio
->sctx
;
2060 BUG_ON(sbio
->page_count
> SCRUB_PAGES_PER_RD_BIO
);
2062 for (i
= 0; i
< sbio
->page_count
; i
++) {
2063 struct scrub_page
*spage
= sbio
->pagev
[i
];
2065 spage
->io_error
= 1;
2066 spage
->sblock
->no_io_error_seen
= 0;
2070 /* now complete the scrub_block items that have all pages completed */
2071 for (i
= 0; i
< sbio
->page_count
; i
++) {
2072 struct scrub_page
*spage
= sbio
->pagev
[i
];
2073 struct scrub_block
*sblock
= spage
->sblock
;
2075 if (atomic_dec_and_test(&sblock
->outstanding_pages
))
2076 scrub_block_complete(sblock
);
2077 scrub_block_put(sblock
);
2082 spin_lock(&sctx
->list_lock
);
2083 sbio
->next_free
= sctx
->first_free
;
2084 sctx
->first_free
= sbio
->index
;
2085 spin_unlock(&sctx
->list_lock
);
2087 if (sctx
->is_dev_replace
&&
2088 atomic_read(&sctx
->wr_ctx
.flush_all_writes
)) {
2089 mutex_lock(&sctx
->wr_ctx
.wr_lock
);
2090 scrub_wr_submit(sctx
);
2091 mutex_unlock(&sctx
->wr_ctx
.wr_lock
);
2094 scrub_pending_bio_dec(sctx
);
2097 static void scrub_block_complete(struct scrub_block
*sblock
)
2099 if (!sblock
->no_io_error_seen
) {
2100 scrub_handle_errored_block(sblock
);
2103 * if has checksum error, write via repair mechanism in
2104 * dev replace case, otherwise write here in dev replace
2107 if (!scrub_checksum(sblock
) && sblock
->sctx
->is_dev_replace
)
2108 scrub_write_block_to_dev_replace(sblock
);
2112 static int scrub_find_csum(struct scrub_ctx
*sctx
, u64 logical
, u64 len
,
2115 struct btrfs_ordered_sum
*sum
= NULL
;
2116 unsigned long index
;
2117 unsigned long num_sectors
;
2119 while (!list_empty(&sctx
->csum_list
)) {
2120 sum
= list_first_entry(&sctx
->csum_list
,
2121 struct btrfs_ordered_sum
, list
);
2122 if (sum
->bytenr
> logical
)
2124 if (sum
->bytenr
+ sum
->len
> logical
)
2127 ++sctx
->stat
.csum_discards
;
2128 list_del(&sum
->list
);
2135 index
= ((u32
)(logical
- sum
->bytenr
)) / sctx
->sectorsize
;
2136 num_sectors
= sum
->len
/ sctx
->sectorsize
;
2137 memcpy(csum
, sum
->sums
+ index
, sctx
->csum_size
);
2138 if (index
== num_sectors
- 1) {
2139 list_del(&sum
->list
);
2145 /* scrub extent tries to collect up to 64 kB for each bio */
2146 static int scrub_extent(struct scrub_ctx
*sctx
, u64 logical
, u64 len
,
2147 u64 physical
, struct btrfs_device
*dev
, u64 flags
,
2148 u64 gen
, int mirror_num
, u64 physical_for_dev_replace
)
2151 u8 csum
[BTRFS_CSUM_SIZE
];
2154 if (flags
& BTRFS_EXTENT_FLAG_DATA
) {
2155 blocksize
= sctx
->sectorsize
;
2156 spin_lock(&sctx
->stat_lock
);
2157 sctx
->stat
.data_extents_scrubbed
++;
2158 sctx
->stat
.data_bytes_scrubbed
+= len
;
2159 spin_unlock(&sctx
->stat_lock
);
2160 } else if (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
) {
2161 WARN_ON(sctx
->nodesize
!= sctx
->leafsize
);
2162 blocksize
= sctx
->nodesize
;
2163 spin_lock(&sctx
->stat_lock
);
2164 sctx
->stat
.tree_extents_scrubbed
++;
2165 sctx
->stat
.tree_bytes_scrubbed
+= len
;
2166 spin_unlock(&sctx
->stat_lock
);
2168 blocksize
= sctx
->sectorsize
;
2173 u64 l
= min_t(u64
, len
, blocksize
);
2176 if (flags
& BTRFS_EXTENT_FLAG_DATA
) {
2177 /* push csums to sbio */
2178 have_csum
= scrub_find_csum(sctx
, logical
, l
, csum
);
2180 ++sctx
->stat
.no_csum
;
2181 if (sctx
->is_dev_replace
&& !have_csum
) {
2182 ret
= copy_nocow_pages(sctx
, logical
, l
,
2184 physical_for_dev_replace
);
2185 goto behind_scrub_pages
;
2188 ret
= scrub_pages(sctx
, logical
, l
, physical
, dev
, flags
, gen
,
2189 mirror_num
, have_csum
? csum
: NULL
, 0,
2190 physical_for_dev_replace
);
2197 physical_for_dev_replace
+= l
;
2202 static noinline_for_stack
int scrub_stripe(struct scrub_ctx
*sctx
,
2203 struct map_lookup
*map
,
2204 struct btrfs_device
*scrub_dev
,
2205 int num
, u64 base
, u64 length
,
2208 struct btrfs_path
*path
;
2209 struct btrfs_fs_info
*fs_info
= sctx
->dev_root
->fs_info
;
2210 struct btrfs_root
*root
= fs_info
->extent_root
;
2211 struct btrfs_root
*csum_root
= fs_info
->csum_root
;
2212 struct btrfs_extent_item
*extent
;
2213 struct blk_plug plug
;
2218 struct extent_buffer
*l
;
2219 struct btrfs_key key
;
2225 struct reada_control
*reada1
;
2226 struct reada_control
*reada2
;
2227 struct btrfs_key key_start
;
2228 struct btrfs_key key_end
;
2229 u64 increment
= map
->stripe_len
;
2232 u64 extent_physical
;
2234 struct btrfs_device
*extent_dev
;
2235 int extent_mirror_num
;
2238 if (map
->type
& (BTRFS_BLOCK_GROUP_RAID5
|
2239 BTRFS_BLOCK_GROUP_RAID6
)) {
2240 if (num
>= nr_data_stripes(map
)) {
2247 do_div(nstripes
, map
->stripe_len
);
2248 if (map
->type
& BTRFS_BLOCK_GROUP_RAID0
) {
2249 offset
= map
->stripe_len
* num
;
2250 increment
= map
->stripe_len
* map
->num_stripes
;
2252 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID10
) {
2253 int factor
= map
->num_stripes
/ map
->sub_stripes
;
2254 offset
= map
->stripe_len
* (num
/ map
->sub_stripes
);
2255 increment
= map
->stripe_len
* factor
;
2256 mirror_num
= num
% map
->sub_stripes
+ 1;
2257 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID1
) {
2258 increment
= map
->stripe_len
;
2259 mirror_num
= num
% map
->num_stripes
+ 1;
2260 } else if (map
->type
& BTRFS_BLOCK_GROUP_DUP
) {
2261 increment
= map
->stripe_len
;
2262 mirror_num
= num
% map
->num_stripes
+ 1;
2264 increment
= map
->stripe_len
;
2268 path
= btrfs_alloc_path();
2273 * work on commit root. The related disk blocks are static as
2274 * long as COW is applied. This means, it is save to rewrite
2275 * them to repair disk errors without any race conditions
2277 path
->search_commit_root
= 1;
2278 path
->skip_locking
= 1;
2281 * trigger the readahead for extent tree csum tree and wait for
2282 * completion. During readahead, the scrub is officially paused
2283 * to not hold off transaction commits
2285 logical
= base
+ offset
;
2287 wait_event(sctx
->list_wait
,
2288 atomic_read(&sctx
->bios_in_flight
) == 0);
2289 atomic_inc(&fs_info
->scrubs_paused
);
2290 wake_up(&fs_info
->scrub_pause_wait
);
2292 /* FIXME it might be better to start readahead at commit root */
2293 key_start
.objectid
= logical
;
2294 key_start
.type
= BTRFS_EXTENT_ITEM_KEY
;
2295 key_start
.offset
= (u64
)0;
2296 key_end
.objectid
= base
+ offset
+ nstripes
* increment
;
2297 key_end
.type
= BTRFS_METADATA_ITEM_KEY
;
2298 key_end
.offset
= (u64
)-1;
2299 reada1
= btrfs_reada_add(root
, &key_start
, &key_end
);
2301 key_start
.objectid
= BTRFS_EXTENT_CSUM_OBJECTID
;
2302 key_start
.type
= BTRFS_EXTENT_CSUM_KEY
;
2303 key_start
.offset
= logical
;
2304 key_end
.objectid
= BTRFS_EXTENT_CSUM_OBJECTID
;
2305 key_end
.type
= BTRFS_EXTENT_CSUM_KEY
;
2306 key_end
.offset
= base
+ offset
+ nstripes
* increment
;
2307 reada2
= btrfs_reada_add(csum_root
, &key_start
, &key_end
);
2309 if (!IS_ERR(reada1
))
2310 btrfs_reada_wait(reada1
);
2311 if (!IS_ERR(reada2
))
2312 btrfs_reada_wait(reada2
);
2314 mutex_lock(&fs_info
->scrub_lock
);
2315 while (atomic_read(&fs_info
->scrub_pause_req
)) {
2316 mutex_unlock(&fs_info
->scrub_lock
);
2317 wait_event(fs_info
->scrub_pause_wait
,
2318 atomic_read(&fs_info
->scrub_pause_req
) == 0);
2319 mutex_lock(&fs_info
->scrub_lock
);
2321 atomic_dec(&fs_info
->scrubs_paused
);
2322 mutex_unlock(&fs_info
->scrub_lock
);
2323 wake_up(&fs_info
->scrub_pause_wait
);
2326 * collect all data csums for the stripe to avoid seeking during
2327 * the scrub. This might currently (crc32) end up to be about 1MB
2329 blk_start_plug(&plug
);
2332 * now find all extents for each stripe and scrub them
2334 logical
= base
+ offset
;
2335 physical
= map
->stripes
[num
].physical
;
2336 logic_end
= logical
+ increment
* nstripes
;
2338 while (logical
< logic_end
) {
2342 if (atomic_read(&fs_info
->scrub_cancel_req
) ||
2343 atomic_read(&sctx
->cancel_req
)) {
2348 * check to see if we have to pause
2350 if (atomic_read(&fs_info
->scrub_pause_req
)) {
2351 /* push queued extents */
2352 atomic_set(&sctx
->wr_ctx
.flush_all_writes
, 1);
2354 mutex_lock(&sctx
->wr_ctx
.wr_lock
);
2355 scrub_wr_submit(sctx
);
2356 mutex_unlock(&sctx
->wr_ctx
.wr_lock
);
2357 wait_event(sctx
->list_wait
,
2358 atomic_read(&sctx
->bios_in_flight
) == 0);
2359 atomic_set(&sctx
->wr_ctx
.flush_all_writes
, 0);
2360 atomic_inc(&fs_info
->scrubs_paused
);
2361 wake_up(&fs_info
->scrub_pause_wait
);
2362 mutex_lock(&fs_info
->scrub_lock
);
2363 while (atomic_read(&fs_info
->scrub_pause_req
)) {
2364 mutex_unlock(&fs_info
->scrub_lock
);
2365 wait_event(fs_info
->scrub_pause_wait
,
2366 atomic_read(&fs_info
->scrub_pause_req
) == 0);
2367 mutex_lock(&fs_info
->scrub_lock
);
2369 atomic_dec(&fs_info
->scrubs_paused
);
2370 mutex_unlock(&fs_info
->scrub_lock
);
2371 wake_up(&fs_info
->scrub_pause_wait
);
2374 key
.objectid
= logical
;
2375 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2376 key
.offset
= (u64
)-1;
2378 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2383 ret
= btrfs_previous_item(root
, path
, 0,
2384 BTRFS_EXTENT_ITEM_KEY
);
2388 /* there's no smaller item, so stick with the
2390 btrfs_release_path(path
);
2391 ret
= btrfs_search_slot(NULL
, root
, &key
,
2403 slot
= path
->slots
[0];
2404 if (slot
>= btrfs_header_nritems(l
)) {
2405 ret
= btrfs_next_leaf(root
, path
);
2414 btrfs_item_key_to_cpu(l
, &key
, slot
);
2416 if (key
.type
== BTRFS_METADATA_ITEM_KEY
)
2417 bytes
= root
->leafsize
;
2421 if (key
.objectid
+ bytes
<= logical
)
2424 if (key
.type
!= BTRFS_EXTENT_ITEM_KEY
&&
2425 key
.type
!= BTRFS_METADATA_ITEM_KEY
)
2428 if (key
.objectid
>= logical
+ map
->stripe_len
) {
2429 /* out of this device extent */
2430 if (key
.objectid
>= logic_end
)
2435 extent
= btrfs_item_ptr(l
, slot
,
2436 struct btrfs_extent_item
);
2437 flags
= btrfs_extent_flags(l
, extent
);
2438 generation
= btrfs_extent_generation(l
, extent
);
2440 if (key
.objectid
< logical
&&
2441 (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
)) {
2443 "btrfs scrub: tree block %llu spanning "
2444 "stripes, ignored. logical=%llu\n",
2445 key
.objectid
, logical
);
2450 extent_logical
= key
.objectid
;
2454 * trim extent to this stripe
2456 if (extent_logical
< logical
) {
2457 extent_len
-= logical
- extent_logical
;
2458 extent_logical
= logical
;
2460 if (extent_logical
+ extent_len
>
2461 logical
+ map
->stripe_len
) {
2462 extent_len
= logical
+ map
->stripe_len
-
2466 extent_physical
= extent_logical
- logical
+ physical
;
2467 extent_dev
= scrub_dev
;
2468 extent_mirror_num
= mirror_num
;
2470 scrub_remap_extent(fs_info
, extent_logical
,
2471 extent_len
, &extent_physical
,
2473 &extent_mirror_num
);
2475 ret
= btrfs_lookup_csums_range(csum_root
, logical
,
2476 logical
+ map
->stripe_len
- 1,
2477 &sctx
->csum_list
, 1);
2481 ret
= scrub_extent(sctx
, extent_logical
, extent_len
,
2482 extent_physical
, extent_dev
, flags
,
2483 generation
, extent_mirror_num
,
2484 extent_logical
- logical
+ physical
);
2488 scrub_free_csums(sctx
);
2489 if (extent_logical
+ extent_len
<
2490 key
.objectid
+ bytes
) {
2491 logical
+= increment
;
2492 physical
+= map
->stripe_len
;
2494 if (logical
< key
.objectid
+ bytes
) {
2499 if (logical
>= logic_end
) {
2507 btrfs_release_path(path
);
2508 logical
+= increment
;
2509 physical
+= map
->stripe_len
;
2510 spin_lock(&sctx
->stat_lock
);
2512 sctx
->stat
.last_physical
= map
->stripes
[num
].physical
+
2515 sctx
->stat
.last_physical
= physical
;
2516 spin_unlock(&sctx
->stat_lock
);
2521 /* push queued extents */
2523 mutex_lock(&sctx
->wr_ctx
.wr_lock
);
2524 scrub_wr_submit(sctx
);
2525 mutex_unlock(&sctx
->wr_ctx
.wr_lock
);
2527 blk_finish_plug(&plug
);
2528 btrfs_free_path(path
);
2529 return ret
< 0 ? ret
: 0;
2532 static noinline_for_stack
int scrub_chunk(struct scrub_ctx
*sctx
,
2533 struct btrfs_device
*scrub_dev
,
2534 u64 chunk_tree
, u64 chunk_objectid
,
2535 u64 chunk_offset
, u64 length
,
2536 u64 dev_offset
, int is_dev_replace
)
2538 struct btrfs_mapping_tree
*map_tree
=
2539 &sctx
->dev_root
->fs_info
->mapping_tree
;
2540 struct map_lookup
*map
;
2541 struct extent_map
*em
;
2545 read_lock(&map_tree
->map_tree
.lock
);
2546 em
= lookup_extent_mapping(&map_tree
->map_tree
, chunk_offset
, 1);
2547 read_unlock(&map_tree
->map_tree
.lock
);
2552 map
= (struct map_lookup
*)em
->bdev
;
2553 if (em
->start
!= chunk_offset
)
2556 if (em
->len
< length
)
2559 for (i
= 0; i
< map
->num_stripes
; ++i
) {
2560 if (map
->stripes
[i
].dev
->bdev
== scrub_dev
->bdev
&&
2561 map
->stripes
[i
].physical
== dev_offset
) {
2562 ret
= scrub_stripe(sctx
, map
, scrub_dev
, i
,
2563 chunk_offset
, length
,
2570 free_extent_map(em
);
2575 static noinline_for_stack
2576 int scrub_enumerate_chunks(struct scrub_ctx
*sctx
,
2577 struct btrfs_device
*scrub_dev
, u64 start
, u64 end
,
2580 struct btrfs_dev_extent
*dev_extent
= NULL
;
2581 struct btrfs_path
*path
;
2582 struct btrfs_root
*root
= sctx
->dev_root
;
2583 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2590 struct extent_buffer
*l
;
2591 struct btrfs_key key
;
2592 struct btrfs_key found_key
;
2593 struct btrfs_block_group_cache
*cache
;
2594 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
2596 path
= btrfs_alloc_path();
2601 path
->search_commit_root
= 1;
2602 path
->skip_locking
= 1;
2604 key
.objectid
= scrub_dev
->devid
;
2606 key
.type
= BTRFS_DEV_EXTENT_KEY
;
2609 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2613 if (path
->slots
[0] >=
2614 btrfs_header_nritems(path
->nodes
[0])) {
2615 ret
= btrfs_next_leaf(root
, path
);
2622 slot
= path
->slots
[0];
2624 btrfs_item_key_to_cpu(l
, &found_key
, slot
);
2626 if (found_key
.objectid
!= scrub_dev
->devid
)
2629 if (btrfs_key_type(&found_key
) != BTRFS_DEV_EXTENT_KEY
)
2632 if (found_key
.offset
>= end
)
2635 if (found_key
.offset
< key
.offset
)
2638 dev_extent
= btrfs_item_ptr(l
, slot
, struct btrfs_dev_extent
);
2639 length
= btrfs_dev_extent_length(l
, dev_extent
);
2641 if (found_key
.offset
+ length
<= start
) {
2642 key
.offset
= found_key
.offset
+ length
;
2643 btrfs_release_path(path
);
2647 chunk_tree
= btrfs_dev_extent_chunk_tree(l
, dev_extent
);
2648 chunk_objectid
= btrfs_dev_extent_chunk_objectid(l
, dev_extent
);
2649 chunk_offset
= btrfs_dev_extent_chunk_offset(l
, dev_extent
);
2652 * get a reference on the corresponding block group to prevent
2653 * the chunk from going away while we scrub it
2655 cache
= btrfs_lookup_block_group(fs_info
, chunk_offset
);
2660 dev_replace
->cursor_right
= found_key
.offset
+ length
;
2661 dev_replace
->cursor_left
= found_key
.offset
;
2662 dev_replace
->item_needs_writeback
= 1;
2663 ret
= scrub_chunk(sctx
, scrub_dev
, chunk_tree
, chunk_objectid
,
2664 chunk_offset
, length
, found_key
.offset
,
2668 * flush, submit all pending read and write bios, afterwards
2670 * Note that in the dev replace case, a read request causes
2671 * write requests that are submitted in the read completion
2672 * worker. Therefore in the current situation, it is required
2673 * that all write requests are flushed, so that all read and
2674 * write requests are really completed when bios_in_flight
2677 atomic_set(&sctx
->wr_ctx
.flush_all_writes
, 1);
2679 mutex_lock(&sctx
->wr_ctx
.wr_lock
);
2680 scrub_wr_submit(sctx
);
2681 mutex_unlock(&sctx
->wr_ctx
.wr_lock
);
2683 wait_event(sctx
->list_wait
,
2684 atomic_read(&sctx
->bios_in_flight
) == 0);
2685 atomic_set(&sctx
->wr_ctx
.flush_all_writes
, 0);
2686 atomic_inc(&fs_info
->scrubs_paused
);
2687 wake_up(&fs_info
->scrub_pause_wait
);
2688 wait_event(sctx
->list_wait
,
2689 atomic_read(&sctx
->workers_pending
) == 0);
2691 mutex_lock(&fs_info
->scrub_lock
);
2692 while (atomic_read(&fs_info
->scrub_pause_req
)) {
2693 mutex_unlock(&fs_info
->scrub_lock
);
2694 wait_event(fs_info
->scrub_pause_wait
,
2695 atomic_read(&fs_info
->scrub_pause_req
) == 0);
2696 mutex_lock(&fs_info
->scrub_lock
);
2698 atomic_dec(&fs_info
->scrubs_paused
);
2699 mutex_unlock(&fs_info
->scrub_lock
);
2700 wake_up(&fs_info
->scrub_pause_wait
);
2702 btrfs_put_block_group(cache
);
2705 if (is_dev_replace
&&
2706 atomic64_read(&dev_replace
->num_write_errors
) > 0) {
2710 if (sctx
->stat
.malloc_errors
> 0) {
2715 dev_replace
->cursor_left
= dev_replace
->cursor_right
;
2716 dev_replace
->item_needs_writeback
= 1;
2718 key
.offset
= found_key
.offset
+ length
;
2719 btrfs_release_path(path
);
2722 btrfs_free_path(path
);
2725 * ret can still be 1 from search_slot or next_leaf,
2726 * that's not an error
2728 return ret
< 0 ? ret
: 0;
2731 static noinline_for_stack
int scrub_supers(struct scrub_ctx
*sctx
,
2732 struct btrfs_device
*scrub_dev
)
2738 struct btrfs_root
*root
= sctx
->dev_root
;
2740 if (test_bit(BTRFS_FS_STATE_ERROR
, &root
->fs_info
->fs_state
))
2743 gen
= root
->fs_info
->last_trans_committed
;
2745 for (i
= 0; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
2746 bytenr
= btrfs_sb_offset(i
);
2747 if (bytenr
+ BTRFS_SUPER_INFO_SIZE
> scrub_dev
->total_bytes
)
2750 ret
= scrub_pages(sctx
, bytenr
, BTRFS_SUPER_INFO_SIZE
, bytenr
,
2751 scrub_dev
, BTRFS_EXTENT_FLAG_SUPER
, gen
, i
,
2756 wait_event(sctx
->list_wait
, atomic_read(&sctx
->bios_in_flight
) == 0);
2762 * get a reference count on fs_info->scrub_workers. start worker if necessary
2764 static noinline_for_stack
int scrub_workers_get(struct btrfs_fs_info
*fs_info
,
2769 if (fs_info
->scrub_workers_refcnt
== 0) {
2771 btrfs_init_workers(&fs_info
->scrub_workers
, "scrub", 1,
2772 &fs_info
->generic_worker
);
2774 btrfs_init_workers(&fs_info
->scrub_workers
, "scrub",
2775 fs_info
->thread_pool_size
,
2776 &fs_info
->generic_worker
);
2777 fs_info
->scrub_workers
.idle_thresh
= 4;
2778 ret
= btrfs_start_workers(&fs_info
->scrub_workers
);
2781 btrfs_init_workers(&fs_info
->scrub_wr_completion_workers
,
2783 fs_info
->thread_pool_size
,
2784 &fs_info
->generic_worker
);
2785 fs_info
->scrub_wr_completion_workers
.idle_thresh
= 2;
2786 ret
= btrfs_start_workers(
2787 &fs_info
->scrub_wr_completion_workers
);
2790 btrfs_init_workers(&fs_info
->scrub_nocow_workers
, "scrubnc", 1,
2791 &fs_info
->generic_worker
);
2792 ret
= btrfs_start_workers(&fs_info
->scrub_nocow_workers
);
2796 ++fs_info
->scrub_workers_refcnt
;
2801 static noinline_for_stack
void scrub_workers_put(struct btrfs_fs_info
*fs_info
)
2803 if (--fs_info
->scrub_workers_refcnt
== 0) {
2804 btrfs_stop_workers(&fs_info
->scrub_workers
);
2805 btrfs_stop_workers(&fs_info
->scrub_wr_completion_workers
);
2806 btrfs_stop_workers(&fs_info
->scrub_nocow_workers
);
2808 WARN_ON(fs_info
->scrub_workers_refcnt
< 0);
2811 int btrfs_scrub_dev(struct btrfs_fs_info
*fs_info
, u64 devid
, u64 start
,
2812 u64 end
, struct btrfs_scrub_progress
*progress
,
2813 int readonly
, int is_dev_replace
)
2815 struct scrub_ctx
*sctx
;
2817 struct btrfs_device
*dev
;
2819 if (btrfs_fs_closing(fs_info
))
2823 * check some assumptions
2825 if (fs_info
->chunk_root
->nodesize
!= fs_info
->chunk_root
->leafsize
) {
2827 "btrfs_scrub: size assumption nodesize == leafsize (%d == %d) fails\n",
2828 fs_info
->chunk_root
->nodesize
,
2829 fs_info
->chunk_root
->leafsize
);
2833 if (fs_info
->chunk_root
->nodesize
> BTRFS_STRIPE_LEN
) {
2835 * in this case scrub is unable to calculate the checksum
2836 * the way scrub is implemented. Do not handle this
2837 * situation at all because it won't ever happen.
2840 "btrfs_scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails\n",
2841 fs_info
->chunk_root
->nodesize
, BTRFS_STRIPE_LEN
);
2845 if (fs_info
->chunk_root
->sectorsize
!= PAGE_SIZE
) {
2846 /* not supported for data w/o checksums */
2848 "btrfs_scrub: size assumption sectorsize != PAGE_SIZE (%d != %lu) fails\n",
2849 fs_info
->chunk_root
->sectorsize
, PAGE_SIZE
);
2853 if (fs_info
->chunk_root
->nodesize
>
2854 PAGE_SIZE
* SCRUB_MAX_PAGES_PER_BLOCK
||
2855 fs_info
->chunk_root
->sectorsize
>
2856 PAGE_SIZE
* SCRUB_MAX_PAGES_PER_BLOCK
) {
2858 * would exhaust the array bounds of pagev member in
2859 * struct scrub_block
2861 pr_err("btrfs_scrub: size assumption nodesize and sectorsize <= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails\n",
2862 fs_info
->chunk_root
->nodesize
,
2863 SCRUB_MAX_PAGES_PER_BLOCK
,
2864 fs_info
->chunk_root
->sectorsize
,
2865 SCRUB_MAX_PAGES_PER_BLOCK
);
2870 mutex_lock(&fs_info
->fs_devices
->device_list_mutex
);
2871 dev
= btrfs_find_device(fs_info
, devid
, NULL
, NULL
);
2872 if (!dev
|| (dev
->missing
&& !is_dev_replace
)) {
2873 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2877 mutex_lock(&fs_info
->scrub_lock
);
2878 if (!dev
->in_fs_metadata
|| dev
->is_tgtdev_for_dev_replace
) {
2879 mutex_unlock(&fs_info
->scrub_lock
);
2880 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2884 btrfs_dev_replace_lock(&fs_info
->dev_replace
);
2885 if (dev
->scrub_device
||
2887 btrfs_dev_replace_is_ongoing(&fs_info
->dev_replace
))) {
2888 btrfs_dev_replace_unlock(&fs_info
->dev_replace
);
2889 mutex_unlock(&fs_info
->scrub_lock
);
2890 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2891 return -EINPROGRESS
;
2893 btrfs_dev_replace_unlock(&fs_info
->dev_replace
);
2895 ret
= scrub_workers_get(fs_info
, is_dev_replace
);
2897 mutex_unlock(&fs_info
->scrub_lock
);
2898 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2902 sctx
= scrub_setup_ctx(dev
, is_dev_replace
);
2904 mutex_unlock(&fs_info
->scrub_lock
);
2905 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2906 scrub_workers_put(fs_info
);
2907 return PTR_ERR(sctx
);
2909 sctx
->readonly
= readonly
;
2910 dev
->scrub_device
= sctx
;
2912 atomic_inc(&fs_info
->scrubs_running
);
2913 mutex_unlock(&fs_info
->scrub_lock
);
2915 if (!is_dev_replace
) {
2917 * by holding device list mutex, we can
2918 * kick off writing super in log tree sync.
2920 ret
= scrub_supers(sctx
, dev
);
2922 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2925 ret
= scrub_enumerate_chunks(sctx
, dev
, start
, end
,
2928 wait_event(sctx
->list_wait
, atomic_read(&sctx
->bios_in_flight
) == 0);
2929 atomic_dec(&fs_info
->scrubs_running
);
2930 wake_up(&fs_info
->scrub_pause_wait
);
2932 wait_event(sctx
->list_wait
, atomic_read(&sctx
->workers_pending
) == 0);
2935 memcpy(progress
, &sctx
->stat
, sizeof(*progress
));
2937 mutex_lock(&fs_info
->scrub_lock
);
2938 dev
->scrub_device
= NULL
;
2939 scrub_workers_put(fs_info
);
2940 mutex_unlock(&fs_info
->scrub_lock
);
2942 scrub_free_ctx(sctx
);
2947 void btrfs_scrub_pause(struct btrfs_root
*root
)
2949 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2951 mutex_lock(&fs_info
->scrub_lock
);
2952 atomic_inc(&fs_info
->scrub_pause_req
);
2953 while (atomic_read(&fs_info
->scrubs_paused
) !=
2954 atomic_read(&fs_info
->scrubs_running
)) {
2955 mutex_unlock(&fs_info
->scrub_lock
);
2956 wait_event(fs_info
->scrub_pause_wait
,
2957 atomic_read(&fs_info
->scrubs_paused
) ==
2958 atomic_read(&fs_info
->scrubs_running
));
2959 mutex_lock(&fs_info
->scrub_lock
);
2961 mutex_unlock(&fs_info
->scrub_lock
);
2964 void btrfs_scrub_continue(struct btrfs_root
*root
)
2966 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2968 atomic_dec(&fs_info
->scrub_pause_req
);
2969 wake_up(&fs_info
->scrub_pause_wait
);
2972 int btrfs_scrub_cancel(struct btrfs_fs_info
*fs_info
)
2974 mutex_lock(&fs_info
->scrub_lock
);
2975 if (!atomic_read(&fs_info
->scrubs_running
)) {
2976 mutex_unlock(&fs_info
->scrub_lock
);
2980 atomic_inc(&fs_info
->scrub_cancel_req
);
2981 while (atomic_read(&fs_info
->scrubs_running
)) {
2982 mutex_unlock(&fs_info
->scrub_lock
);
2983 wait_event(fs_info
->scrub_pause_wait
,
2984 atomic_read(&fs_info
->scrubs_running
) == 0);
2985 mutex_lock(&fs_info
->scrub_lock
);
2987 atomic_dec(&fs_info
->scrub_cancel_req
);
2988 mutex_unlock(&fs_info
->scrub_lock
);
2993 int btrfs_scrub_cancel_dev(struct btrfs_fs_info
*fs_info
,
2994 struct btrfs_device
*dev
)
2996 struct scrub_ctx
*sctx
;
2998 mutex_lock(&fs_info
->scrub_lock
);
2999 sctx
= dev
->scrub_device
;
3001 mutex_unlock(&fs_info
->scrub_lock
);
3004 atomic_inc(&sctx
->cancel_req
);
3005 while (dev
->scrub_device
) {
3006 mutex_unlock(&fs_info
->scrub_lock
);
3007 wait_event(fs_info
->scrub_pause_wait
,
3008 dev
->scrub_device
== NULL
);
3009 mutex_lock(&fs_info
->scrub_lock
);
3011 mutex_unlock(&fs_info
->scrub_lock
);
3016 int btrfs_scrub_progress(struct btrfs_root
*root
, u64 devid
,
3017 struct btrfs_scrub_progress
*progress
)
3019 struct btrfs_device
*dev
;
3020 struct scrub_ctx
*sctx
= NULL
;
3022 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
3023 dev
= btrfs_find_device(root
->fs_info
, devid
, NULL
, NULL
);
3025 sctx
= dev
->scrub_device
;
3027 memcpy(progress
, &sctx
->stat
, sizeof(*progress
));
3028 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
3030 return dev
? (sctx
? 0 : -ENOTCONN
) : -ENODEV
;
3033 static void scrub_remap_extent(struct btrfs_fs_info
*fs_info
,
3034 u64 extent_logical
, u64 extent_len
,
3035 u64
*extent_physical
,
3036 struct btrfs_device
**extent_dev
,
3037 int *extent_mirror_num
)
3040 struct btrfs_bio
*bbio
= NULL
;
3043 mapped_length
= extent_len
;
3044 ret
= btrfs_map_block(fs_info
, READ
, extent_logical
,
3045 &mapped_length
, &bbio
, 0);
3046 if (ret
|| !bbio
|| mapped_length
< extent_len
||
3047 !bbio
->stripes
[0].dev
->bdev
) {
3052 *extent_physical
= bbio
->stripes
[0].physical
;
3053 *extent_mirror_num
= bbio
->mirror_num
;
3054 *extent_dev
= bbio
->stripes
[0].dev
;
3058 static int scrub_setup_wr_ctx(struct scrub_ctx
*sctx
,
3059 struct scrub_wr_ctx
*wr_ctx
,
3060 struct btrfs_fs_info
*fs_info
,
3061 struct btrfs_device
*dev
,
3064 WARN_ON(wr_ctx
->wr_curr_bio
!= NULL
);
3066 mutex_init(&wr_ctx
->wr_lock
);
3067 wr_ctx
->wr_curr_bio
= NULL
;
3068 if (!is_dev_replace
)
3071 WARN_ON(!dev
->bdev
);
3072 wr_ctx
->pages_per_wr_bio
= min_t(int, SCRUB_PAGES_PER_WR_BIO
,
3073 bio_get_nr_vecs(dev
->bdev
));
3074 wr_ctx
->tgtdev
= dev
;
3075 atomic_set(&wr_ctx
->flush_all_writes
, 0);
3079 static void scrub_free_wr_ctx(struct scrub_wr_ctx
*wr_ctx
)
3081 mutex_lock(&wr_ctx
->wr_lock
);
3082 kfree(wr_ctx
->wr_curr_bio
);
3083 wr_ctx
->wr_curr_bio
= NULL
;
3084 mutex_unlock(&wr_ctx
->wr_lock
);
3087 static int copy_nocow_pages(struct scrub_ctx
*sctx
, u64 logical
, u64 len
,
3088 int mirror_num
, u64 physical_for_dev_replace
)
3090 struct scrub_copy_nocow_ctx
*nocow_ctx
;
3091 struct btrfs_fs_info
*fs_info
= sctx
->dev_root
->fs_info
;
3093 nocow_ctx
= kzalloc(sizeof(*nocow_ctx
), GFP_NOFS
);
3095 spin_lock(&sctx
->stat_lock
);
3096 sctx
->stat
.malloc_errors
++;
3097 spin_unlock(&sctx
->stat_lock
);
3101 scrub_pending_trans_workers_inc(sctx
);
3103 nocow_ctx
->sctx
= sctx
;
3104 nocow_ctx
->logical
= logical
;
3105 nocow_ctx
->len
= len
;
3106 nocow_ctx
->mirror_num
= mirror_num
;
3107 nocow_ctx
->physical_for_dev_replace
= physical_for_dev_replace
;
3108 nocow_ctx
->work
.func
= copy_nocow_pages_worker
;
3109 INIT_LIST_HEAD(&nocow_ctx
->inodes
);
3110 btrfs_queue_worker(&fs_info
->scrub_nocow_workers
,
3116 static int record_inode_for_nocow(u64 inum
, u64 offset
, u64 root
, void *ctx
)
3118 struct scrub_copy_nocow_ctx
*nocow_ctx
= ctx
;
3119 struct scrub_nocow_inode
*nocow_inode
;
3121 nocow_inode
= kzalloc(sizeof(*nocow_inode
), GFP_NOFS
);
3124 nocow_inode
->inum
= inum
;
3125 nocow_inode
->offset
= offset
;
3126 nocow_inode
->root
= root
;
3127 list_add_tail(&nocow_inode
->list
, &nocow_ctx
->inodes
);
3131 #define COPY_COMPLETE 1
3133 static void copy_nocow_pages_worker(struct btrfs_work
*work
)
3135 struct scrub_copy_nocow_ctx
*nocow_ctx
=
3136 container_of(work
, struct scrub_copy_nocow_ctx
, work
);
3137 struct scrub_ctx
*sctx
= nocow_ctx
->sctx
;
3138 u64 logical
= nocow_ctx
->logical
;
3139 u64 len
= nocow_ctx
->len
;
3140 int mirror_num
= nocow_ctx
->mirror_num
;
3141 u64 physical_for_dev_replace
= nocow_ctx
->physical_for_dev_replace
;
3143 struct btrfs_trans_handle
*trans
= NULL
;
3144 struct btrfs_fs_info
*fs_info
;
3145 struct btrfs_path
*path
;
3146 struct btrfs_root
*root
;
3147 int not_written
= 0;
3149 fs_info
= sctx
->dev_root
->fs_info
;
3150 root
= fs_info
->extent_root
;
3152 path
= btrfs_alloc_path();
3154 spin_lock(&sctx
->stat_lock
);
3155 sctx
->stat
.malloc_errors
++;
3156 spin_unlock(&sctx
->stat_lock
);
3161 trans
= btrfs_join_transaction(root
);
3162 if (IS_ERR(trans
)) {
3167 ret
= iterate_inodes_from_logical(logical
, fs_info
, path
,
3168 record_inode_for_nocow
, nocow_ctx
);
3169 if (ret
!= 0 && ret
!= -ENOENT
) {
3170 pr_warn("iterate_inodes_from_logical() failed: log %llu, phys %llu, len %llu, mir %u, ret %d\n",
3171 logical
, physical_for_dev_replace
, len
, mirror_num
,
3177 btrfs_end_transaction(trans
, root
);
3179 while (!list_empty(&nocow_ctx
->inodes
)) {
3180 struct scrub_nocow_inode
*entry
;
3181 entry
= list_first_entry(&nocow_ctx
->inodes
,
3182 struct scrub_nocow_inode
,
3184 list_del_init(&entry
->list
);
3185 ret
= copy_nocow_pages_for_inode(entry
->inum
, entry
->offset
,
3186 entry
->root
, nocow_ctx
);
3188 if (ret
== COPY_COMPLETE
) {
3196 while (!list_empty(&nocow_ctx
->inodes
)) {
3197 struct scrub_nocow_inode
*entry
;
3198 entry
= list_first_entry(&nocow_ctx
->inodes
,
3199 struct scrub_nocow_inode
,
3201 list_del_init(&entry
->list
);
3204 if (trans
&& !IS_ERR(trans
))
3205 btrfs_end_transaction(trans
, root
);
3207 btrfs_dev_replace_stats_inc(&fs_info
->dev_replace
.
3208 num_uncorrectable_read_errors
);
3210 btrfs_free_path(path
);
3213 scrub_pending_trans_workers_dec(sctx
);
3216 static int copy_nocow_pages_for_inode(u64 inum
, u64 offset
, u64 root
,
3217 struct scrub_copy_nocow_ctx
*nocow_ctx
)
3219 struct btrfs_fs_info
*fs_info
= nocow_ctx
->sctx
->dev_root
->fs_info
;
3220 struct btrfs_key key
;
3221 struct inode
*inode
;
3223 struct btrfs_root
*local_root
;
3224 struct btrfs_ordered_extent
*ordered
;
3225 struct extent_map
*em
;
3226 struct extent_state
*cached_state
= NULL
;
3227 struct extent_io_tree
*io_tree
;
3228 u64 physical_for_dev_replace
;
3229 u64 len
= nocow_ctx
->len
;
3230 u64 lockstart
= offset
, lockend
= offset
+ len
- 1;
3231 unsigned long index
;
3236 key
.objectid
= root
;
3237 key
.type
= BTRFS_ROOT_ITEM_KEY
;
3238 key
.offset
= (u64
)-1;
3240 srcu_index
= srcu_read_lock(&fs_info
->subvol_srcu
);
3242 local_root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
3243 if (IS_ERR(local_root
)) {
3244 srcu_read_unlock(&fs_info
->subvol_srcu
, srcu_index
);
3245 return PTR_ERR(local_root
);
3248 key
.type
= BTRFS_INODE_ITEM_KEY
;
3249 key
.objectid
= inum
;
3251 inode
= btrfs_iget(fs_info
->sb
, &key
, local_root
, NULL
);
3252 srcu_read_unlock(&fs_info
->subvol_srcu
, srcu_index
);
3254 return PTR_ERR(inode
);
3256 /* Avoid truncate/dio/punch hole.. */
3257 mutex_lock(&inode
->i_mutex
);
3258 inode_dio_wait(inode
);
3260 physical_for_dev_replace
= nocow_ctx
->physical_for_dev_replace
;
3261 io_tree
= &BTRFS_I(inode
)->io_tree
;
3263 lock_extent_bits(io_tree
, lockstart
, lockend
, 0, &cached_state
);
3264 ordered
= btrfs_lookup_ordered_range(inode
, lockstart
, len
);
3266 btrfs_put_ordered_extent(ordered
);
3270 em
= btrfs_get_extent(inode
, NULL
, 0, lockstart
, len
, 0);
3277 * This extent does not actually cover the logical extent anymore,
3278 * move on to the next inode.
3280 if (em
->block_start
> nocow_ctx
->logical
||
3281 em
->block_start
+ em
->block_len
< nocow_ctx
->logical
+ len
) {
3282 free_extent_map(em
);
3285 free_extent_map(em
);
3287 while (len
>= PAGE_CACHE_SIZE
) {
3288 index
= offset
>> PAGE_CACHE_SHIFT
;
3290 page
= find_or_create_page(inode
->i_mapping
, index
, GFP_NOFS
);
3292 pr_err("find_or_create_page() failed\n");
3297 if (PageUptodate(page
)) {
3298 if (PageDirty(page
))
3301 ClearPageError(page
);
3302 err
= extent_read_full_page_nolock(io_tree
, page
,
3304 nocow_ctx
->mirror_num
);
3312 * If the page has been remove from the page cache,
3313 * the data on it is meaningless, because it may be
3314 * old one, the new data may be written into the new
3315 * page in the page cache.
3317 if (page
->mapping
!= inode
->i_mapping
) {
3319 page_cache_release(page
);
3322 if (!PageUptodate(page
)) {
3327 err
= write_page_nocow(nocow_ctx
->sctx
,
3328 physical_for_dev_replace
, page
);
3333 page_cache_release(page
);
3338 offset
+= PAGE_CACHE_SIZE
;
3339 physical_for_dev_replace
+= PAGE_CACHE_SIZE
;
3340 len
-= PAGE_CACHE_SIZE
;
3342 ret
= COPY_COMPLETE
;
3344 unlock_extent_cached(io_tree
, lockstart
, lockend
, &cached_state
,
3347 mutex_unlock(&inode
->i_mutex
);
3352 static int write_page_nocow(struct scrub_ctx
*sctx
,
3353 u64 physical_for_dev_replace
, struct page
*page
)
3356 struct btrfs_device
*dev
;
3359 dev
= sctx
->wr_ctx
.tgtdev
;
3363 printk_ratelimited(KERN_WARNING
3364 "btrfs: scrub write_page_nocow(bdev == NULL) is unexpected!\n");
3367 bio
= btrfs_io_bio_alloc(GFP_NOFS
, 1);
3369 spin_lock(&sctx
->stat_lock
);
3370 sctx
->stat
.malloc_errors
++;
3371 spin_unlock(&sctx
->stat_lock
);
3375 bio
->bi_sector
= physical_for_dev_replace
>> 9;
3376 bio
->bi_bdev
= dev
->bdev
;
3377 ret
= bio_add_page(bio
, page
, PAGE_CACHE_SIZE
, 0);
3378 if (ret
!= PAGE_CACHE_SIZE
) {
3381 btrfs_dev_stat_inc_and_print(dev
, BTRFS_DEV_STAT_WRITE_ERRS
);
3385 if (btrfsic_submit_bio_wait(WRITE_SYNC
, bio
))
3386 goto leave_with_eio
;