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
);
259 static void __scrub_blocked_if_needed(struct btrfs_fs_info
*fs_info
);
260 static void scrub_blocked_if_needed(struct btrfs_fs_info
*fs_info
);
263 static void scrub_pending_bio_inc(struct scrub_ctx
*sctx
)
265 atomic_inc(&sctx
->bios_in_flight
);
268 static void scrub_pending_bio_dec(struct scrub_ctx
*sctx
)
270 atomic_dec(&sctx
->bios_in_flight
);
271 wake_up(&sctx
->list_wait
);
274 static void __scrub_blocked_if_needed(struct btrfs_fs_info
*fs_info
)
276 while (atomic_read(&fs_info
->scrub_pause_req
)) {
277 mutex_unlock(&fs_info
->scrub_lock
);
278 wait_event(fs_info
->scrub_pause_wait
,
279 atomic_read(&fs_info
->scrub_pause_req
) == 0);
280 mutex_lock(&fs_info
->scrub_lock
);
284 static void scrub_blocked_if_needed(struct btrfs_fs_info
*fs_info
)
286 atomic_inc(&fs_info
->scrubs_paused
);
287 wake_up(&fs_info
->scrub_pause_wait
);
289 mutex_lock(&fs_info
->scrub_lock
);
290 __scrub_blocked_if_needed(fs_info
);
291 atomic_dec(&fs_info
->scrubs_paused
);
292 mutex_unlock(&fs_info
->scrub_lock
);
294 wake_up(&fs_info
->scrub_pause_wait
);
298 * used for workers that require transaction commits (i.e., for the
301 static void scrub_pending_trans_workers_inc(struct scrub_ctx
*sctx
)
303 struct btrfs_fs_info
*fs_info
= sctx
->dev_root
->fs_info
;
306 * increment scrubs_running to prevent cancel requests from
307 * completing as long as a worker is running. we must also
308 * increment scrubs_paused to prevent deadlocking on pause
309 * requests used for transactions commits (as the worker uses a
310 * transaction context). it is safe to regard the worker
311 * as paused for all matters practical. effectively, we only
312 * avoid cancellation requests from completing.
314 mutex_lock(&fs_info
->scrub_lock
);
315 atomic_inc(&fs_info
->scrubs_running
);
316 atomic_inc(&fs_info
->scrubs_paused
);
317 mutex_unlock(&fs_info
->scrub_lock
);
318 atomic_inc(&sctx
->workers_pending
);
321 /* used for workers that require transaction commits */
322 static void scrub_pending_trans_workers_dec(struct scrub_ctx
*sctx
)
324 struct btrfs_fs_info
*fs_info
= sctx
->dev_root
->fs_info
;
327 * see scrub_pending_trans_workers_inc() why we're pretending
328 * to be paused in the scrub counters
330 mutex_lock(&fs_info
->scrub_lock
);
331 atomic_dec(&fs_info
->scrubs_running
);
332 atomic_dec(&fs_info
->scrubs_paused
);
333 mutex_unlock(&fs_info
->scrub_lock
);
334 atomic_dec(&sctx
->workers_pending
);
335 wake_up(&fs_info
->scrub_pause_wait
);
336 wake_up(&sctx
->list_wait
);
339 static void scrub_free_csums(struct scrub_ctx
*sctx
)
341 while (!list_empty(&sctx
->csum_list
)) {
342 struct btrfs_ordered_sum
*sum
;
343 sum
= list_first_entry(&sctx
->csum_list
,
344 struct btrfs_ordered_sum
, list
);
345 list_del(&sum
->list
);
350 static noinline_for_stack
void scrub_free_ctx(struct scrub_ctx
*sctx
)
357 scrub_free_wr_ctx(&sctx
->wr_ctx
);
359 /* this can happen when scrub is cancelled */
360 if (sctx
->curr
!= -1) {
361 struct scrub_bio
*sbio
= sctx
->bios
[sctx
->curr
];
363 for (i
= 0; i
< sbio
->page_count
; i
++) {
364 WARN_ON(!sbio
->pagev
[i
]->page
);
365 scrub_block_put(sbio
->pagev
[i
]->sblock
);
370 for (i
= 0; i
< SCRUB_BIOS_PER_SCTX
; ++i
) {
371 struct scrub_bio
*sbio
= sctx
->bios
[i
];
378 scrub_free_csums(sctx
);
382 static noinline_for_stack
383 struct scrub_ctx
*scrub_setup_ctx(struct btrfs_device
*dev
, int is_dev_replace
)
385 struct scrub_ctx
*sctx
;
387 struct btrfs_fs_info
*fs_info
= dev
->dev_root
->fs_info
;
388 int pages_per_rd_bio
;
392 * the setting of pages_per_rd_bio is correct for scrub but might
393 * be wrong for the dev_replace code where we might read from
394 * different devices in the initial huge bios. However, that
395 * code is able to correctly handle the case when adding a page
399 pages_per_rd_bio
= min_t(int, SCRUB_PAGES_PER_RD_BIO
,
400 bio_get_nr_vecs(dev
->bdev
));
402 pages_per_rd_bio
= SCRUB_PAGES_PER_RD_BIO
;
403 sctx
= kzalloc(sizeof(*sctx
), GFP_NOFS
);
406 sctx
->is_dev_replace
= is_dev_replace
;
407 sctx
->pages_per_rd_bio
= pages_per_rd_bio
;
409 sctx
->dev_root
= dev
->dev_root
;
410 for (i
= 0; i
< SCRUB_BIOS_PER_SCTX
; ++i
) {
411 struct scrub_bio
*sbio
;
413 sbio
= kzalloc(sizeof(*sbio
), GFP_NOFS
);
416 sctx
->bios
[i
] = sbio
;
420 sbio
->page_count
= 0;
421 sbio
->work
.func
= scrub_bio_end_io_worker
;
423 if (i
!= SCRUB_BIOS_PER_SCTX
- 1)
424 sctx
->bios
[i
]->next_free
= i
+ 1;
426 sctx
->bios
[i
]->next_free
= -1;
428 sctx
->first_free
= 0;
429 sctx
->nodesize
= dev
->dev_root
->nodesize
;
430 sctx
->leafsize
= dev
->dev_root
->leafsize
;
431 sctx
->sectorsize
= dev
->dev_root
->sectorsize
;
432 atomic_set(&sctx
->bios_in_flight
, 0);
433 atomic_set(&sctx
->workers_pending
, 0);
434 atomic_set(&sctx
->cancel_req
, 0);
435 sctx
->csum_size
= btrfs_super_csum_size(fs_info
->super_copy
);
436 INIT_LIST_HEAD(&sctx
->csum_list
);
438 spin_lock_init(&sctx
->list_lock
);
439 spin_lock_init(&sctx
->stat_lock
);
440 init_waitqueue_head(&sctx
->list_wait
);
442 ret
= scrub_setup_wr_ctx(sctx
, &sctx
->wr_ctx
, fs_info
,
443 fs_info
->dev_replace
.tgtdev
, is_dev_replace
);
445 scrub_free_ctx(sctx
);
451 scrub_free_ctx(sctx
);
452 return ERR_PTR(-ENOMEM
);
455 static int scrub_print_warning_inode(u64 inum
, u64 offset
, u64 root
,
462 struct extent_buffer
*eb
;
463 struct btrfs_inode_item
*inode_item
;
464 struct scrub_warning
*swarn
= warn_ctx
;
465 struct btrfs_fs_info
*fs_info
= swarn
->dev
->dev_root
->fs_info
;
466 struct inode_fs_paths
*ipath
= NULL
;
467 struct btrfs_root
*local_root
;
468 struct btrfs_key root_key
;
470 root_key
.objectid
= root
;
471 root_key
.type
= BTRFS_ROOT_ITEM_KEY
;
472 root_key
.offset
= (u64
)-1;
473 local_root
= btrfs_read_fs_root_no_name(fs_info
, &root_key
);
474 if (IS_ERR(local_root
)) {
475 ret
= PTR_ERR(local_root
);
479 ret
= inode_item_info(inum
, 0, local_root
, swarn
->path
);
481 btrfs_release_path(swarn
->path
);
485 eb
= swarn
->path
->nodes
[0];
486 inode_item
= btrfs_item_ptr(eb
, swarn
->path
->slots
[0],
487 struct btrfs_inode_item
);
488 isize
= btrfs_inode_size(eb
, inode_item
);
489 nlink
= btrfs_inode_nlink(eb
, inode_item
);
490 btrfs_release_path(swarn
->path
);
492 ipath
= init_ipath(4096, local_root
, swarn
->path
);
494 ret
= PTR_ERR(ipath
);
498 ret
= paths_from_inode(inum
, ipath
);
504 * we deliberately ignore the bit ipath might have been too small to
505 * hold all of the paths here
507 for (i
= 0; i
< ipath
->fspath
->elem_cnt
; ++i
)
508 printk_in_rcu(KERN_WARNING
"BTRFS: %s at logical %llu on dev "
509 "%s, sector %llu, root %llu, inode %llu, offset %llu, "
510 "length %llu, links %u (path: %s)\n", swarn
->errstr
,
511 swarn
->logical
, rcu_str_deref(swarn
->dev
->name
),
512 (unsigned long long)swarn
->sector
, root
, inum
, offset
,
513 min(isize
- offset
, (u64
)PAGE_SIZE
), nlink
,
514 (char *)(unsigned long)ipath
->fspath
->val
[i
]);
520 printk_in_rcu(KERN_WARNING
"BTRFS: %s at logical %llu on dev "
521 "%s, sector %llu, root %llu, inode %llu, offset %llu: path "
522 "resolving failed with ret=%d\n", swarn
->errstr
,
523 swarn
->logical
, rcu_str_deref(swarn
->dev
->name
),
524 (unsigned long long)swarn
->sector
, root
, inum
, offset
, ret
);
530 static void scrub_print_warning(const char *errstr
, struct scrub_block
*sblock
)
532 struct btrfs_device
*dev
;
533 struct btrfs_fs_info
*fs_info
;
534 struct btrfs_path
*path
;
535 struct btrfs_key found_key
;
536 struct extent_buffer
*eb
;
537 struct btrfs_extent_item
*ei
;
538 struct scrub_warning swarn
;
539 unsigned long ptr
= 0;
545 const int bufsize
= 4096;
548 WARN_ON(sblock
->page_count
< 1);
549 dev
= sblock
->pagev
[0]->dev
;
550 fs_info
= sblock
->sctx
->dev_root
->fs_info
;
552 path
= btrfs_alloc_path();
554 swarn
.scratch_buf
= kmalloc(bufsize
, GFP_NOFS
);
555 swarn
.msg_buf
= kmalloc(bufsize
, GFP_NOFS
);
556 swarn
.sector
= (sblock
->pagev
[0]->physical
) >> 9;
557 swarn
.logical
= sblock
->pagev
[0]->logical
;
558 swarn
.errstr
= errstr
;
560 swarn
.msg_bufsize
= bufsize
;
561 swarn
.scratch_bufsize
= bufsize
;
563 if (!path
|| !swarn
.scratch_buf
|| !swarn
.msg_buf
)
566 ret
= extent_from_logical(fs_info
, swarn
.logical
, path
, &found_key
,
571 extent_item_pos
= swarn
.logical
- found_key
.objectid
;
572 swarn
.extent_item_size
= found_key
.offset
;
575 ei
= btrfs_item_ptr(eb
, path
->slots
[0], struct btrfs_extent_item
);
576 item_size
= btrfs_item_size_nr(eb
, path
->slots
[0]);
578 if (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
) {
580 ret
= tree_backref_for_extent(&ptr
, eb
, ei
, item_size
,
581 &ref_root
, &ref_level
);
582 printk_in_rcu(KERN_WARNING
583 "BTRFS: %s at logical %llu on dev %s, "
584 "sector %llu: metadata %s (level %d) in tree "
585 "%llu\n", errstr
, swarn
.logical
,
586 rcu_str_deref(dev
->name
),
587 (unsigned long long)swarn
.sector
,
588 ref_level
? "node" : "leaf",
589 ret
< 0 ? -1 : ref_level
,
590 ret
< 0 ? -1 : ref_root
);
592 btrfs_release_path(path
);
594 btrfs_release_path(path
);
597 iterate_extent_inodes(fs_info
, found_key
.objectid
,
599 scrub_print_warning_inode
, &swarn
);
603 btrfs_free_path(path
);
604 kfree(swarn
.scratch_buf
);
605 kfree(swarn
.msg_buf
);
608 static int scrub_fixup_readpage(u64 inum
, u64 offset
, u64 root
, void *fixup_ctx
)
610 struct page
*page
= NULL
;
612 struct scrub_fixup_nodatasum
*fixup
= fixup_ctx
;
615 struct btrfs_key key
;
616 struct inode
*inode
= NULL
;
617 struct btrfs_fs_info
*fs_info
;
618 u64 end
= offset
+ PAGE_SIZE
- 1;
619 struct btrfs_root
*local_root
;
623 key
.type
= BTRFS_ROOT_ITEM_KEY
;
624 key
.offset
= (u64
)-1;
626 fs_info
= fixup
->root
->fs_info
;
627 srcu_index
= srcu_read_lock(&fs_info
->subvol_srcu
);
629 local_root
= btrfs_read_fs_root_no_name(fs_info
, &key
);
630 if (IS_ERR(local_root
)) {
631 srcu_read_unlock(&fs_info
->subvol_srcu
, srcu_index
);
632 return PTR_ERR(local_root
);
635 key
.type
= BTRFS_INODE_ITEM_KEY
;
638 inode
= btrfs_iget(fs_info
->sb
, &key
, local_root
, NULL
);
639 srcu_read_unlock(&fs_info
->subvol_srcu
, srcu_index
);
641 return PTR_ERR(inode
);
643 index
= offset
>> PAGE_CACHE_SHIFT
;
645 page
= find_or_create_page(inode
->i_mapping
, index
, GFP_NOFS
);
651 if (PageUptodate(page
)) {
652 if (PageDirty(page
)) {
654 * we need to write the data to the defect sector. the
655 * data that was in that sector is not in memory,
656 * because the page was modified. we must not write the
657 * modified page to that sector.
659 * TODO: what could be done here: wait for the delalloc
660 * runner to write out that page (might involve
661 * COW) and see whether the sector is still
662 * referenced afterwards.
664 * For the meantime, we'll treat this error
665 * incorrectable, although there is a chance that a
666 * later scrub will find the bad sector again and that
667 * there's no dirty page in memory, then.
672 fs_info
= BTRFS_I(inode
)->root
->fs_info
;
673 ret
= repair_io_failure(fs_info
, offset
, PAGE_SIZE
,
674 fixup
->logical
, page
,
680 * we need to get good data first. the general readpage path
681 * will call repair_io_failure for us, we just have to make
682 * sure we read the bad mirror.
684 ret
= set_extent_bits(&BTRFS_I(inode
)->io_tree
, offset
, end
,
685 EXTENT_DAMAGED
, GFP_NOFS
);
687 /* set_extent_bits should give proper error */
694 ret
= extent_read_full_page(&BTRFS_I(inode
)->io_tree
, page
,
697 wait_on_page_locked(page
);
699 corrected
= !test_range_bit(&BTRFS_I(inode
)->io_tree
, offset
,
700 end
, EXTENT_DAMAGED
, 0, NULL
);
702 clear_extent_bits(&BTRFS_I(inode
)->io_tree
, offset
, end
,
703 EXTENT_DAMAGED
, GFP_NOFS
);
715 if (ret
== 0 && corrected
) {
717 * we only need to call readpage for one of the inodes belonging
718 * to this extent. so make iterate_extent_inodes stop
726 static void scrub_fixup_nodatasum(struct btrfs_work
*work
)
729 struct scrub_fixup_nodatasum
*fixup
;
730 struct scrub_ctx
*sctx
;
731 struct btrfs_trans_handle
*trans
= NULL
;
732 struct btrfs_path
*path
;
733 int uncorrectable
= 0;
735 fixup
= container_of(work
, struct scrub_fixup_nodatasum
, work
);
738 path
= btrfs_alloc_path();
740 spin_lock(&sctx
->stat_lock
);
741 ++sctx
->stat
.malloc_errors
;
742 spin_unlock(&sctx
->stat_lock
);
747 trans
= btrfs_join_transaction(fixup
->root
);
754 * the idea is to trigger a regular read through the standard path. we
755 * read a page from the (failed) logical address by specifying the
756 * corresponding copynum of the failed sector. thus, that readpage is
758 * that is the point where on-the-fly error correction will kick in
759 * (once it's finished) and rewrite the failed sector if a good copy
762 ret
= iterate_inodes_from_logical(fixup
->logical
, fixup
->root
->fs_info
,
763 path
, scrub_fixup_readpage
,
771 spin_lock(&sctx
->stat_lock
);
772 ++sctx
->stat
.corrected_errors
;
773 spin_unlock(&sctx
->stat_lock
);
776 if (trans
&& !IS_ERR(trans
))
777 btrfs_end_transaction(trans
, fixup
->root
);
779 spin_lock(&sctx
->stat_lock
);
780 ++sctx
->stat
.uncorrectable_errors
;
781 spin_unlock(&sctx
->stat_lock
);
782 btrfs_dev_replace_stats_inc(
783 &sctx
->dev_root
->fs_info
->dev_replace
.
784 num_uncorrectable_read_errors
);
785 printk_ratelimited_in_rcu(KERN_ERR
"BTRFS: "
786 "unable to fixup (nodatasum) error at logical %llu on dev %s\n",
787 fixup
->logical
, rcu_str_deref(fixup
->dev
->name
));
790 btrfs_free_path(path
);
793 scrub_pending_trans_workers_dec(sctx
);
797 * scrub_handle_errored_block gets called when either verification of the
798 * pages failed or the bio failed to read, e.g. with EIO. In the latter
799 * case, this function handles all pages in the bio, even though only one
801 * The goal of this function is to repair the errored block by using the
802 * contents of one of the mirrors.
804 static int scrub_handle_errored_block(struct scrub_block
*sblock_to_check
)
806 struct scrub_ctx
*sctx
= sblock_to_check
->sctx
;
807 struct btrfs_device
*dev
;
808 struct btrfs_fs_info
*fs_info
;
812 unsigned int failed_mirror_index
;
813 unsigned int is_metadata
;
814 unsigned int have_csum
;
816 struct scrub_block
*sblocks_for_recheck
; /* holds one for each mirror */
817 struct scrub_block
*sblock_bad
;
822 static DEFINE_RATELIMIT_STATE(_rs
, DEFAULT_RATELIMIT_INTERVAL
,
823 DEFAULT_RATELIMIT_BURST
);
825 BUG_ON(sblock_to_check
->page_count
< 1);
826 fs_info
= sctx
->dev_root
->fs_info
;
827 if (sblock_to_check
->pagev
[0]->flags
& BTRFS_EXTENT_FLAG_SUPER
) {
829 * if we find an error in a super block, we just report it.
830 * They will get written with the next transaction commit
833 spin_lock(&sctx
->stat_lock
);
834 ++sctx
->stat
.super_errors
;
835 spin_unlock(&sctx
->stat_lock
);
838 length
= sblock_to_check
->page_count
* PAGE_SIZE
;
839 logical
= sblock_to_check
->pagev
[0]->logical
;
840 generation
= sblock_to_check
->pagev
[0]->generation
;
841 BUG_ON(sblock_to_check
->pagev
[0]->mirror_num
< 1);
842 failed_mirror_index
= sblock_to_check
->pagev
[0]->mirror_num
- 1;
843 is_metadata
= !(sblock_to_check
->pagev
[0]->flags
&
844 BTRFS_EXTENT_FLAG_DATA
);
845 have_csum
= sblock_to_check
->pagev
[0]->have_csum
;
846 csum
= sblock_to_check
->pagev
[0]->csum
;
847 dev
= sblock_to_check
->pagev
[0]->dev
;
849 if (sctx
->is_dev_replace
&& !is_metadata
&& !have_csum
) {
850 sblocks_for_recheck
= NULL
;
855 * read all mirrors one after the other. This includes to
856 * re-read the extent or metadata block that failed (that was
857 * the cause that this fixup code is called) another time,
858 * page by page this time in order to know which pages
859 * caused I/O errors and which ones are good (for all mirrors).
860 * It is the goal to handle the situation when more than one
861 * mirror contains I/O errors, but the errors do not
862 * overlap, i.e. the data can be repaired by selecting the
863 * pages from those mirrors without I/O error on the
864 * particular pages. One example (with blocks >= 2 * PAGE_SIZE)
865 * would be that mirror #1 has an I/O error on the first page,
866 * the second page is good, and mirror #2 has an I/O error on
867 * the second page, but the first page is good.
868 * Then the first page of the first mirror can be repaired by
869 * taking the first page of the second mirror, and the
870 * second page of the second mirror can be repaired by
871 * copying the contents of the 2nd page of the 1st mirror.
872 * One more note: if the pages of one mirror contain I/O
873 * errors, the checksum cannot be verified. In order to get
874 * the best data for repairing, the first attempt is to find
875 * a mirror without I/O errors and with a validated checksum.
876 * Only if this is not possible, the pages are picked from
877 * mirrors with I/O errors without considering the checksum.
878 * If the latter is the case, at the end, the checksum of the
879 * repaired area is verified in order to correctly maintain
883 sblocks_for_recheck
= kzalloc(BTRFS_MAX_MIRRORS
*
884 sizeof(*sblocks_for_recheck
),
886 if (!sblocks_for_recheck
) {
887 spin_lock(&sctx
->stat_lock
);
888 sctx
->stat
.malloc_errors
++;
889 sctx
->stat
.read_errors
++;
890 sctx
->stat
.uncorrectable_errors
++;
891 spin_unlock(&sctx
->stat_lock
);
892 btrfs_dev_stat_inc_and_print(dev
, BTRFS_DEV_STAT_READ_ERRS
);
896 /* setup the context, map the logical blocks and alloc the pages */
897 ret
= scrub_setup_recheck_block(sctx
, fs_info
, sblock_to_check
, length
,
898 logical
, sblocks_for_recheck
);
900 spin_lock(&sctx
->stat_lock
);
901 sctx
->stat
.read_errors
++;
902 sctx
->stat
.uncorrectable_errors
++;
903 spin_unlock(&sctx
->stat_lock
);
904 btrfs_dev_stat_inc_and_print(dev
, BTRFS_DEV_STAT_READ_ERRS
);
907 BUG_ON(failed_mirror_index
>= BTRFS_MAX_MIRRORS
);
908 sblock_bad
= sblocks_for_recheck
+ failed_mirror_index
;
910 /* build and submit the bios for the failed mirror, check checksums */
911 scrub_recheck_block(fs_info
, sblock_bad
, is_metadata
, have_csum
,
912 csum
, generation
, sctx
->csum_size
);
914 if (!sblock_bad
->header_error
&& !sblock_bad
->checksum_error
&&
915 sblock_bad
->no_io_error_seen
) {
917 * the error disappeared after reading page by page, or
918 * the area was part of a huge bio and other parts of the
919 * bio caused I/O errors, or the block layer merged several
920 * read requests into one and the error is caused by a
921 * different bio (usually one of the two latter cases is
924 spin_lock(&sctx
->stat_lock
);
925 sctx
->stat
.unverified_errors
++;
926 spin_unlock(&sctx
->stat_lock
);
928 if (sctx
->is_dev_replace
)
929 scrub_write_block_to_dev_replace(sblock_bad
);
933 if (!sblock_bad
->no_io_error_seen
) {
934 spin_lock(&sctx
->stat_lock
);
935 sctx
->stat
.read_errors
++;
936 spin_unlock(&sctx
->stat_lock
);
937 if (__ratelimit(&_rs
))
938 scrub_print_warning("i/o error", sblock_to_check
);
939 btrfs_dev_stat_inc_and_print(dev
, BTRFS_DEV_STAT_READ_ERRS
);
940 } else if (sblock_bad
->checksum_error
) {
941 spin_lock(&sctx
->stat_lock
);
942 sctx
->stat
.csum_errors
++;
943 spin_unlock(&sctx
->stat_lock
);
944 if (__ratelimit(&_rs
))
945 scrub_print_warning("checksum error", sblock_to_check
);
946 btrfs_dev_stat_inc_and_print(dev
,
947 BTRFS_DEV_STAT_CORRUPTION_ERRS
);
948 } else if (sblock_bad
->header_error
) {
949 spin_lock(&sctx
->stat_lock
);
950 sctx
->stat
.verify_errors
++;
951 spin_unlock(&sctx
->stat_lock
);
952 if (__ratelimit(&_rs
))
953 scrub_print_warning("checksum/header error",
955 if (sblock_bad
->generation_error
)
956 btrfs_dev_stat_inc_and_print(dev
,
957 BTRFS_DEV_STAT_GENERATION_ERRS
);
959 btrfs_dev_stat_inc_and_print(dev
,
960 BTRFS_DEV_STAT_CORRUPTION_ERRS
);
963 if (sctx
->readonly
) {
964 ASSERT(!sctx
->is_dev_replace
);
968 if (!is_metadata
&& !have_csum
) {
969 struct scrub_fixup_nodatasum
*fixup_nodatasum
;
972 WARN_ON(sctx
->is_dev_replace
);
975 * !is_metadata and !have_csum, this means that the data
976 * might not be COW'ed, that it might be modified
977 * concurrently. The general strategy to work on the
978 * commit root does not help in the case when COW is not
981 fixup_nodatasum
= kzalloc(sizeof(*fixup_nodatasum
), GFP_NOFS
);
982 if (!fixup_nodatasum
)
983 goto did_not_correct_error
;
984 fixup_nodatasum
->sctx
= sctx
;
985 fixup_nodatasum
->dev
= dev
;
986 fixup_nodatasum
->logical
= logical
;
987 fixup_nodatasum
->root
= fs_info
->extent_root
;
988 fixup_nodatasum
->mirror_num
= failed_mirror_index
+ 1;
989 scrub_pending_trans_workers_inc(sctx
);
990 fixup_nodatasum
->work
.func
= scrub_fixup_nodatasum
;
991 btrfs_queue_worker(&fs_info
->scrub_workers
,
992 &fixup_nodatasum
->work
);
997 * now build and submit the bios for the other mirrors, check
999 * First try to pick the mirror which is completely without I/O
1000 * errors and also does not have a checksum error.
1001 * If one is found, and if a checksum is present, the full block
1002 * that is known to contain an error is rewritten. Afterwards
1003 * the block is known to be corrected.
1004 * If a mirror is found which is completely correct, and no
1005 * checksum is present, only those pages are rewritten that had
1006 * an I/O error in the block to be repaired, since it cannot be
1007 * determined, which copy of the other pages is better (and it
1008 * could happen otherwise that a correct page would be
1009 * overwritten by a bad one).
1011 for (mirror_index
= 0;
1012 mirror_index
< BTRFS_MAX_MIRRORS
&&
1013 sblocks_for_recheck
[mirror_index
].page_count
> 0;
1015 struct scrub_block
*sblock_other
;
1017 if (mirror_index
== failed_mirror_index
)
1019 sblock_other
= sblocks_for_recheck
+ mirror_index
;
1021 /* build and submit the bios, check checksums */
1022 scrub_recheck_block(fs_info
, sblock_other
, is_metadata
,
1023 have_csum
, csum
, generation
,
1026 if (!sblock_other
->header_error
&&
1027 !sblock_other
->checksum_error
&&
1028 sblock_other
->no_io_error_seen
) {
1029 if (sctx
->is_dev_replace
) {
1030 scrub_write_block_to_dev_replace(sblock_other
);
1032 int force_write
= is_metadata
|| have_csum
;
1034 ret
= scrub_repair_block_from_good_copy(
1035 sblock_bad
, sblock_other
,
1039 goto corrected_error
;
1044 * for dev_replace, pick good pages and write to the target device.
1046 if (sctx
->is_dev_replace
) {
1048 for (page_num
= 0; page_num
< sblock_bad
->page_count
;
1053 for (mirror_index
= 0;
1054 mirror_index
< BTRFS_MAX_MIRRORS
&&
1055 sblocks_for_recheck
[mirror_index
].page_count
> 0;
1057 struct scrub_block
*sblock_other
=
1058 sblocks_for_recheck
+ mirror_index
;
1059 struct scrub_page
*page_other
=
1060 sblock_other
->pagev
[page_num
];
1062 if (!page_other
->io_error
) {
1063 ret
= scrub_write_page_to_dev_replace(
1064 sblock_other
, page_num
);
1066 /* succeeded for this page */
1070 btrfs_dev_replace_stats_inc(
1072 fs_info
->dev_replace
.
1080 * did not find a mirror to fetch the page
1081 * from. scrub_write_page_to_dev_replace()
1082 * handles this case (page->io_error), by
1083 * filling the block with zeros before
1084 * submitting the write request
1087 ret
= scrub_write_page_to_dev_replace(
1088 sblock_bad
, page_num
);
1090 btrfs_dev_replace_stats_inc(
1091 &sctx
->dev_root
->fs_info
->
1092 dev_replace
.num_write_errors
);
1100 * for regular scrub, repair those pages that are errored.
1101 * In case of I/O errors in the area that is supposed to be
1102 * repaired, continue by picking good copies of those pages.
1103 * Select the good pages from mirrors to rewrite bad pages from
1104 * the area to fix. Afterwards verify the checksum of the block
1105 * that is supposed to be repaired. This verification step is
1106 * only done for the purpose of statistic counting and for the
1107 * final scrub report, whether errors remain.
1108 * A perfect algorithm could make use of the checksum and try
1109 * all possible combinations of pages from the different mirrors
1110 * until the checksum verification succeeds. For example, when
1111 * the 2nd page of mirror #1 faces I/O errors, and the 2nd page
1112 * of mirror #2 is readable but the final checksum test fails,
1113 * then the 2nd page of mirror #3 could be tried, whether now
1114 * the final checksum succeedes. But this would be a rare
1115 * exception and is therefore not implemented. At least it is
1116 * avoided that the good copy is overwritten.
1117 * A more useful improvement would be to pick the sectors
1118 * without I/O error based on sector sizes (512 bytes on legacy
1119 * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one
1120 * mirror could be repaired by taking 512 byte of a different
1121 * mirror, even if other 512 byte sectors in the same PAGE_SIZE
1122 * area are unreadable.
1125 /* can only fix I/O errors from here on */
1126 if (sblock_bad
->no_io_error_seen
)
1127 goto did_not_correct_error
;
1130 for (page_num
= 0; page_num
< sblock_bad
->page_count
; page_num
++) {
1131 struct scrub_page
*page_bad
= sblock_bad
->pagev
[page_num
];
1133 if (!page_bad
->io_error
)
1136 for (mirror_index
= 0;
1137 mirror_index
< BTRFS_MAX_MIRRORS
&&
1138 sblocks_for_recheck
[mirror_index
].page_count
> 0;
1140 struct scrub_block
*sblock_other
= sblocks_for_recheck
+
1142 struct scrub_page
*page_other
= sblock_other
->pagev
[
1145 if (!page_other
->io_error
) {
1146 ret
= scrub_repair_page_from_good_copy(
1147 sblock_bad
, sblock_other
, page_num
, 0);
1149 page_bad
->io_error
= 0;
1150 break; /* succeeded for this page */
1155 if (page_bad
->io_error
) {
1156 /* did not find a mirror to copy the page from */
1162 if (is_metadata
|| have_csum
) {
1164 * need to verify the checksum now that all
1165 * sectors on disk are repaired (the write
1166 * request for data to be repaired is on its way).
1167 * Just be lazy and use scrub_recheck_block()
1168 * which re-reads the data before the checksum
1169 * is verified, but most likely the data comes out
1170 * of the page cache.
1172 scrub_recheck_block(fs_info
, sblock_bad
,
1173 is_metadata
, have_csum
, csum
,
1174 generation
, sctx
->csum_size
);
1175 if (!sblock_bad
->header_error
&&
1176 !sblock_bad
->checksum_error
&&
1177 sblock_bad
->no_io_error_seen
)
1178 goto corrected_error
;
1180 goto did_not_correct_error
;
1183 spin_lock(&sctx
->stat_lock
);
1184 sctx
->stat
.corrected_errors
++;
1185 spin_unlock(&sctx
->stat_lock
);
1186 printk_ratelimited_in_rcu(KERN_ERR
1187 "BTRFS: fixed up error at logical %llu on dev %s\n",
1188 logical
, rcu_str_deref(dev
->name
));
1191 did_not_correct_error
:
1192 spin_lock(&sctx
->stat_lock
);
1193 sctx
->stat
.uncorrectable_errors
++;
1194 spin_unlock(&sctx
->stat_lock
);
1195 printk_ratelimited_in_rcu(KERN_ERR
1196 "BTRFS: unable to fixup (regular) error at logical %llu on dev %s\n",
1197 logical
, rcu_str_deref(dev
->name
));
1201 if (sblocks_for_recheck
) {
1202 for (mirror_index
= 0; mirror_index
< BTRFS_MAX_MIRRORS
;
1204 struct scrub_block
*sblock
= sblocks_for_recheck
+
1208 for (page_index
= 0; page_index
< sblock
->page_count
;
1210 sblock
->pagev
[page_index
]->sblock
= NULL
;
1211 scrub_page_put(sblock
->pagev
[page_index
]);
1214 kfree(sblocks_for_recheck
);
1220 static int scrub_setup_recheck_block(struct scrub_ctx
*sctx
,
1221 struct btrfs_fs_info
*fs_info
,
1222 struct scrub_block
*original_sblock
,
1223 u64 length
, u64 logical
,
1224 struct scrub_block
*sblocks_for_recheck
)
1231 * note: the two members ref_count and outstanding_pages
1232 * are not used (and not set) in the blocks that are used for
1233 * the recheck procedure
1237 while (length
> 0) {
1238 u64 sublen
= min_t(u64
, length
, PAGE_SIZE
);
1239 u64 mapped_length
= sublen
;
1240 struct btrfs_bio
*bbio
= NULL
;
1243 * with a length of PAGE_SIZE, each returned stripe
1244 * represents one mirror
1246 ret
= btrfs_map_block(fs_info
, REQ_GET_READ_MIRRORS
, logical
,
1247 &mapped_length
, &bbio
, 0);
1248 if (ret
|| !bbio
|| mapped_length
< sublen
) {
1253 BUG_ON(page_index
>= SCRUB_PAGES_PER_RD_BIO
);
1254 for (mirror_index
= 0; mirror_index
< (int)bbio
->num_stripes
;
1256 struct scrub_block
*sblock
;
1257 struct scrub_page
*page
;
1259 if (mirror_index
>= BTRFS_MAX_MIRRORS
)
1262 sblock
= sblocks_for_recheck
+ mirror_index
;
1263 sblock
->sctx
= sctx
;
1264 page
= kzalloc(sizeof(*page
), GFP_NOFS
);
1267 spin_lock(&sctx
->stat_lock
);
1268 sctx
->stat
.malloc_errors
++;
1269 spin_unlock(&sctx
->stat_lock
);
1273 scrub_page_get(page
);
1274 sblock
->pagev
[page_index
] = page
;
1275 page
->logical
= logical
;
1276 page
->physical
= bbio
->stripes
[mirror_index
].physical
;
1277 BUG_ON(page_index
>= original_sblock
->page_count
);
1278 page
->physical_for_dev_replace
=
1279 original_sblock
->pagev
[page_index
]->
1280 physical_for_dev_replace
;
1281 /* for missing devices, dev->bdev is NULL */
1282 page
->dev
= bbio
->stripes
[mirror_index
].dev
;
1283 page
->mirror_num
= mirror_index
+ 1;
1284 sblock
->page_count
++;
1285 page
->page
= alloc_page(GFP_NOFS
);
1299 * this function will check the on disk data for checksum errors, header
1300 * errors and read I/O errors. If any I/O errors happen, the exact pages
1301 * which are errored are marked as being bad. The goal is to enable scrub
1302 * to take those pages that are not errored from all the mirrors so that
1303 * the pages that are errored in the just handled mirror can be repaired.
1305 static void scrub_recheck_block(struct btrfs_fs_info
*fs_info
,
1306 struct scrub_block
*sblock
, int is_metadata
,
1307 int have_csum
, u8
*csum
, u64 generation
,
1312 sblock
->no_io_error_seen
= 1;
1313 sblock
->header_error
= 0;
1314 sblock
->checksum_error
= 0;
1316 for (page_num
= 0; page_num
< sblock
->page_count
; page_num
++) {
1318 struct scrub_page
*page
= sblock
->pagev
[page_num
];
1320 if (page
->dev
->bdev
== NULL
) {
1322 sblock
->no_io_error_seen
= 0;
1326 WARN_ON(!page
->page
);
1327 bio
= btrfs_io_bio_alloc(GFP_NOFS
, 1);
1330 sblock
->no_io_error_seen
= 0;
1333 bio
->bi_bdev
= page
->dev
->bdev
;
1334 bio
->bi_sector
= page
->physical
>> 9;
1336 bio_add_page(bio
, page
->page
, PAGE_SIZE
, 0);
1337 if (btrfsic_submit_bio_wait(READ
, bio
))
1338 sblock
->no_io_error_seen
= 0;
1343 if (sblock
->no_io_error_seen
)
1344 scrub_recheck_block_checksum(fs_info
, sblock
, is_metadata
,
1345 have_csum
, csum
, generation
,
1351 static void scrub_recheck_block_checksum(struct btrfs_fs_info
*fs_info
,
1352 struct scrub_block
*sblock
,
1353 int is_metadata
, int have_csum
,
1354 const u8
*csum
, u64 generation
,
1358 u8 calculated_csum
[BTRFS_CSUM_SIZE
];
1360 void *mapped_buffer
;
1362 WARN_ON(!sblock
->pagev
[0]->page
);
1364 struct btrfs_header
*h
;
1366 mapped_buffer
= kmap_atomic(sblock
->pagev
[0]->page
);
1367 h
= (struct btrfs_header
*)mapped_buffer
;
1369 if (sblock
->pagev
[0]->logical
!= btrfs_stack_header_bytenr(h
) ||
1370 memcmp(h
->fsid
, fs_info
->fsid
, BTRFS_UUID_SIZE
) ||
1371 memcmp(h
->chunk_tree_uuid
, fs_info
->chunk_tree_uuid
,
1373 sblock
->header_error
= 1;
1374 } else if (generation
!= btrfs_stack_header_generation(h
)) {
1375 sblock
->header_error
= 1;
1376 sblock
->generation_error
= 1;
1383 mapped_buffer
= kmap_atomic(sblock
->pagev
[0]->page
);
1386 for (page_num
= 0;;) {
1387 if (page_num
== 0 && is_metadata
)
1388 crc
= btrfs_csum_data(
1389 ((u8
*)mapped_buffer
) + BTRFS_CSUM_SIZE
,
1390 crc
, PAGE_SIZE
- BTRFS_CSUM_SIZE
);
1392 crc
= btrfs_csum_data(mapped_buffer
, crc
, PAGE_SIZE
);
1394 kunmap_atomic(mapped_buffer
);
1396 if (page_num
>= sblock
->page_count
)
1398 WARN_ON(!sblock
->pagev
[page_num
]->page
);
1400 mapped_buffer
= kmap_atomic(sblock
->pagev
[page_num
]->page
);
1403 btrfs_csum_final(crc
, calculated_csum
);
1404 if (memcmp(calculated_csum
, csum
, csum_size
))
1405 sblock
->checksum_error
= 1;
1408 static int scrub_repair_block_from_good_copy(struct scrub_block
*sblock_bad
,
1409 struct scrub_block
*sblock_good
,
1415 for (page_num
= 0; page_num
< sblock_bad
->page_count
; page_num
++) {
1418 ret_sub
= scrub_repair_page_from_good_copy(sblock_bad
,
1429 static int scrub_repair_page_from_good_copy(struct scrub_block
*sblock_bad
,
1430 struct scrub_block
*sblock_good
,
1431 int page_num
, int force_write
)
1433 struct scrub_page
*page_bad
= sblock_bad
->pagev
[page_num
];
1434 struct scrub_page
*page_good
= sblock_good
->pagev
[page_num
];
1436 BUG_ON(page_bad
->page
== NULL
);
1437 BUG_ON(page_good
->page
== NULL
);
1438 if (force_write
|| sblock_bad
->header_error
||
1439 sblock_bad
->checksum_error
|| page_bad
->io_error
) {
1443 if (!page_bad
->dev
->bdev
) {
1444 printk_ratelimited(KERN_WARNING
"BTRFS: "
1445 "scrub_repair_page_from_good_copy(bdev == NULL) "
1446 "is unexpected!\n");
1450 bio
= btrfs_io_bio_alloc(GFP_NOFS
, 1);
1453 bio
->bi_bdev
= page_bad
->dev
->bdev
;
1454 bio
->bi_sector
= page_bad
->physical
>> 9;
1456 ret
= bio_add_page(bio
, page_good
->page
, PAGE_SIZE
, 0);
1457 if (PAGE_SIZE
!= ret
) {
1462 if (btrfsic_submit_bio_wait(WRITE
, bio
)) {
1463 btrfs_dev_stat_inc_and_print(page_bad
->dev
,
1464 BTRFS_DEV_STAT_WRITE_ERRS
);
1465 btrfs_dev_replace_stats_inc(
1466 &sblock_bad
->sctx
->dev_root
->fs_info
->
1467 dev_replace
.num_write_errors
);
1477 static void scrub_write_block_to_dev_replace(struct scrub_block
*sblock
)
1481 for (page_num
= 0; page_num
< sblock
->page_count
; page_num
++) {
1484 ret
= scrub_write_page_to_dev_replace(sblock
, page_num
);
1486 btrfs_dev_replace_stats_inc(
1487 &sblock
->sctx
->dev_root
->fs_info
->dev_replace
.
1492 static int scrub_write_page_to_dev_replace(struct scrub_block
*sblock
,
1495 struct scrub_page
*spage
= sblock
->pagev
[page_num
];
1497 BUG_ON(spage
->page
== NULL
);
1498 if (spage
->io_error
) {
1499 void *mapped_buffer
= kmap_atomic(spage
->page
);
1501 memset(mapped_buffer
, 0, PAGE_CACHE_SIZE
);
1502 flush_dcache_page(spage
->page
);
1503 kunmap_atomic(mapped_buffer
);
1505 return scrub_add_page_to_wr_bio(sblock
->sctx
, spage
);
1508 static int scrub_add_page_to_wr_bio(struct scrub_ctx
*sctx
,
1509 struct scrub_page
*spage
)
1511 struct scrub_wr_ctx
*wr_ctx
= &sctx
->wr_ctx
;
1512 struct scrub_bio
*sbio
;
1515 mutex_lock(&wr_ctx
->wr_lock
);
1517 if (!wr_ctx
->wr_curr_bio
) {
1518 wr_ctx
->wr_curr_bio
= kzalloc(sizeof(*wr_ctx
->wr_curr_bio
),
1520 if (!wr_ctx
->wr_curr_bio
) {
1521 mutex_unlock(&wr_ctx
->wr_lock
);
1524 wr_ctx
->wr_curr_bio
->sctx
= sctx
;
1525 wr_ctx
->wr_curr_bio
->page_count
= 0;
1527 sbio
= wr_ctx
->wr_curr_bio
;
1528 if (sbio
->page_count
== 0) {
1531 sbio
->physical
= spage
->physical_for_dev_replace
;
1532 sbio
->logical
= spage
->logical
;
1533 sbio
->dev
= wr_ctx
->tgtdev
;
1536 bio
= btrfs_io_bio_alloc(GFP_NOFS
, wr_ctx
->pages_per_wr_bio
);
1538 mutex_unlock(&wr_ctx
->wr_lock
);
1544 bio
->bi_private
= sbio
;
1545 bio
->bi_end_io
= scrub_wr_bio_end_io
;
1546 bio
->bi_bdev
= sbio
->dev
->bdev
;
1547 bio
->bi_sector
= sbio
->physical
>> 9;
1549 } else if (sbio
->physical
+ sbio
->page_count
* PAGE_SIZE
!=
1550 spage
->physical_for_dev_replace
||
1551 sbio
->logical
+ sbio
->page_count
* PAGE_SIZE
!=
1553 scrub_wr_submit(sctx
);
1557 ret
= bio_add_page(sbio
->bio
, spage
->page
, PAGE_SIZE
, 0);
1558 if (ret
!= PAGE_SIZE
) {
1559 if (sbio
->page_count
< 1) {
1562 mutex_unlock(&wr_ctx
->wr_lock
);
1565 scrub_wr_submit(sctx
);
1569 sbio
->pagev
[sbio
->page_count
] = spage
;
1570 scrub_page_get(spage
);
1572 if (sbio
->page_count
== wr_ctx
->pages_per_wr_bio
)
1573 scrub_wr_submit(sctx
);
1574 mutex_unlock(&wr_ctx
->wr_lock
);
1579 static void scrub_wr_submit(struct scrub_ctx
*sctx
)
1581 struct scrub_wr_ctx
*wr_ctx
= &sctx
->wr_ctx
;
1582 struct scrub_bio
*sbio
;
1584 if (!wr_ctx
->wr_curr_bio
)
1587 sbio
= wr_ctx
->wr_curr_bio
;
1588 wr_ctx
->wr_curr_bio
= NULL
;
1589 WARN_ON(!sbio
->bio
->bi_bdev
);
1590 scrub_pending_bio_inc(sctx
);
1591 /* process all writes in a single worker thread. Then the block layer
1592 * orders the requests before sending them to the driver which
1593 * doubled the write performance on spinning disks when measured
1595 btrfsic_submit_bio(WRITE
, sbio
->bio
);
1598 static void scrub_wr_bio_end_io(struct bio
*bio
, int err
)
1600 struct scrub_bio
*sbio
= bio
->bi_private
;
1601 struct btrfs_fs_info
*fs_info
= sbio
->dev
->dev_root
->fs_info
;
1606 sbio
->work
.func
= scrub_wr_bio_end_io_worker
;
1607 btrfs_queue_worker(&fs_info
->scrub_wr_completion_workers
, &sbio
->work
);
1610 static void scrub_wr_bio_end_io_worker(struct btrfs_work
*work
)
1612 struct scrub_bio
*sbio
= container_of(work
, struct scrub_bio
, work
);
1613 struct scrub_ctx
*sctx
= sbio
->sctx
;
1616 WARN_ON(sbio
->page_count
> SCRUB_PAGES_PER_WR_BIO
);
1618 struct btrfs_dev_replace
*dev_replace
=
1619 &sbio
->sctx
->dev_root
->fs_info
->dev_replace
;
1621 for (i
= 0; i
< sbio
->page_count
; i
++) {
1622 struct scrub_page
*spage
= sbio
->pagev
[i
];
1624 spage
->io_error
= 1;
1625 btrfs_dev_replace_stats_inc(&dev_replace
->
1630 for (i
= 0; i
< sbio
->page_count
; i
++)
1631 scrub_page_put(sbio
->pagev
[i
]);
1635 scrub_pending_bio_dec(sctx
);
1638 static int scrub_checksum(struct scrub_block
*sblock
)
1643 WARN_ON(sblock
->page_count
< 1);
1644 flags
= sblock
->pagev
[0]->flags
;
1646 if (flags
& BTRFS_EXTENT_FLAG_DATA
)
1647 ret
= scrub_checksum_data(sblock
);
1648 else if (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
)
1649 ret
= scrub_checksum_tree_block(sblock
);
1650 else if (flags
& BTRFS_EXTENT_FLAG_SUPER
)
1651 (void)scrub_checksum_super(sblock
);
1655 scrub_handle_errored_block(sblock
);
1660 static int scrub_checksum_data(struct scrub_block
*sblock
)
1662 struct scrub_ctx
*sctx
= sblock
->sctx
;
1663 u8 csum
[BTRFS_CSUM_SIZE
];
1672 BUG_ON(sblock
->page_count
< 1);
1673 if (!sblock
->pagev
[0]->have_csum
)
1676 on_disk_csum
= sblock
->pagev
[0]->csum
;
1677 page
= sblock
->pagev
[0]->page
;
1678 buffer
= kmap_atomic(page
);
1680 len
= sctx
->sectorsize
;
1683 u64 l
= min_t(u64
, len
, PAGE_SIZE
);
1685 crc
= btrfs_csum_data(buffer
, crc
, l
);
1686 kunmap_atomic(buffer
);
1691 BUG_ON(index
>= sblock
->page_count
);
1692 BUG_ON(!sblock
->pagev
[index
]->page
);
1693 page
= sblock
->pagev
[index
]->page
;
1694 buffer
= kmap_atomic(page
);
1697 btrfs_csum_final(crc
, csum
);
1698 if (memcmp(csum
, on_disk_csum
, sctx
->csum_size
))
1704 static int scrub_checksum_tree_block(struct scrub_block
*sblock
)
1706 struct scrub_ctx
*sctx
= sblock
->sctx
;
1707 struct btrfs_header
*h
;
1708 struct btrfs_root
*root
= sctx
->dev_root
;
1709 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1710 u8 calculated_csum
[BTRFS_CSUM_SIZE
];
1711 u8 on_disk_csum
[BTRFS_CSUM_SIZE
];
1713 void *mapped_buffer
;
1722 BUG_ON(sblock
->page_count
< 1);
1723 page
= sblock
->pagev
[0]->page
;
1724 mapped_buffer
= kmap_atomic(page
);
1725 h
= (struct btrfs_header
*)mapped_buffer
;
1726 memcpy(on_disk_csum
, h
->csum
, sctx
->csum_size
);
1729 * we don't use the getter functions here, as we
1730 * a) don't have an extent buffer and
1731 * b) the page is already kmapped
1734 if (sblock
->pagev
[0]->logical
!= btrfs_stack_header_bytenr(h
))
1737 if (sblock
->pagev
[0]->generation
!= btrfs_stack_header_generation(h
))
1740 if (memcmp(h
->fsid
, fs_info
->fsid
, BTRFS_UUID_SIZE
))
1743 if (memcmp(h
->chunk_tree_uuid
, fs_info
->chunk_tree_uuid
,
1747 WARN_ON(sctx
->nodesize
!= sctx
->leafsize
);
1748 len
= sctx
->nodesize
- BTRFS_CSUM_SIZE
;
1749 mapped_size
= PAGE_SIZE
- BTRFS_CSUM_SIZE
;
1750 p
= ((u8
*)mapped_buffer
) + BTRFS_CSUM_SIZE
;
1753 u64 l
= min_t(u64
, len
, mapped_size
);
1755 crc
= btrfs_csum_data(p
, crc
, l
);
1756 kunmap_atomic(mapped_buffer
);
1761 BUG_ON(index
>= sblock
->page_count
);
1762 BUG_ON(!sblock
->pagev
[index
]->page
);
1763 page
= sblock
->pagev
[index
]->page
;
1764 mapped_buffer
= kmap_atomic(page
);
1765 mapped_size
= PAGE_SIZE
;
1769 btrfs_csum_final(crc
, calculated_csum
);
1770 if (memcmp(calculated_csum
, on_disk_csum
, sctx
->csum_size
))
1773 return fail
|| crc_fail
;
1776 static int scrub_checksum_super(struct scrub_block
*sblock
)
1778 struct btrfs_super_block
*s
;
1779 struct scrub_ctx
*sctx
= sblock
->sctx
;
1780 struct btrfs_root
*root
= sctx
->dev_root
;
1781 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
1782 u8 calculated_csum
[BTRFS_CSUM_SIZE
];
1783 u8 on_disk_csum
[BTRFS_CSUM_SIZE
];
1785 void *mapped_buffer
;
1794 BUG_ON(sblock
->page_count
< 1);
1795 page
= sblock
->pagev
[0]->page
;
1796 mapped_buffer
= kmap_atomic(page
);
1797 s
= (struct btrfs_super_block
*)mapped_buffer
;
1798 memcpy(on_disk_csum
, s
->csum
, sctx
->csum_size
);
1800 if (sblock
->pagev
[0]->logical
!= btrfs_super_bytenr(s
))
1803 if (sblock
->pagev
[0]->generation
!= btrfs_super_generation(s
))
1806 if (memcmp(s
->fsid
, fs_info
->fsid
, BTRFS_UUID_SIZE
))
1809 len
= BTRFS_SUPER_INFO_SIZE
- BTRFS_CSUM_SIZE
;
1810 mapped_size
= PAGE_SIZE
- BTRFS_CSUM_SIZE
;
1811 p
= ((u8
*)mapped_buffer
) + BTRFS_CSUM_SIZE
;
1814 u64 l
= min_t(u64
, len
, mapped_size
);
1816 crc
= btrfs_csum_data(p
, crc
, l
);
1817 kunmap_atomic(mapped_buffer
);
1822 BUG_ON(index
>= sblock
->page_count
);
1823 BUG_ON(!sblock
->pagev
[index
]->page
);
1824 page
= sblock
->pagev
[index
]->page
;
1825 mapped_buffer
= kmap_atomic(page
);
1826 mapped_size
= PAGE_SIZE
;
1830 btrfs_csum_final(crc
, calculated_csum
);
1831 if (memcmp(calculated_csum
, on_disk_csum
, sctx
->csum_size
))
1834 if (fail_cor
+ fail_gen
) {
1836 * if we find an error in a super block, we just report it.
1837 * They will get written with the next transaction commit
1840 spin_lock(&sctx
->stat_lock
);
1841 ++sctx
->stat
.super_errors
;
1842 spin_unlock(&sctx
->stat_lock
);
1844 btrfs_dev_stat_inc_and_print(sblock
->pagev
[0]->dev
,
1845 BTRFS_DEV_STAT_CORRUPTION_ERRS
);
1847 btrfs_dev_stat_inc_and_print(sblock
->pagev
[0]->dev
,
1848 BTRFS_DEV_STAT_GENERATION_ERRS
);
1851 return fail_cor
+ fail_gen
;
1854 static void scrub_block_get(struct scrub_block
*sblock
)
1856 atomic_inc(&sblock
->ref_count
);
1859 static void scrub_block_put(struct scrub_block
*sblock
)
1861 if (atomic_dec_and_test(&sblock
->ref_count
)) {
1864 for (i
= 0; i
< sblock
->page_count
; i
++)
1865 scrub_page_put(sblock
->pagev
[i
]);
1870 static void scrub_page_get(struct scrub_page
*spage
)
1872 atomic_inc(&spage
->ref_count
);
1875 static void scrub_page_put(struct scrub_page
*spage
)
1877 if (atomic_dec_and_test(&spage
->ref_count
)) {
1879 __free_page(spage
->page
);
1884 static void scrub_submit(struct scrub_ctx
*sctx
)
1886 struct scrub_bio
*sbio
;
1888 if (sctx
->curr
== -1)
1891 sbio
= sctx
->bios
[sctx
->curr
];
1893 scrub_pending_bio_inc(sctx
);
1895 if (!sbio
->bio
->bi_bdev
) {
1897 * this case should not happen. If btrfs_map_block() is
1898 * wrong, it could happen for dev-replace operations on
1899 * missing devices when no mirrors are available, but in
1900 * this case it should already fail the mount.
1901 * This case is handled correctly (but _very_ slowly).
1903 printk_ratelimited(KERN_WARNING
1904 "BTRFS: scrub_submit(bio bdev == NULL) is unexpected!\n");
1905 bio_endio(sbio
->bio
, -EIO
);
1907 btrfsic_submit_bio(READ
, sbio
->bio
);
1911 static int scrub_add_page_to_rd_bio(struct scrub_ctx
*sctx
,
1912 struct scrub_page
*spage
)
1914 struct scrub_block
*sblock
= spage
->sblock
;
1915 struct scrub_bio
*sbio
;
1920 * grab a fresh bio or wait for one to become available
1922 while (sctx
->curr
== -1) {
1923 spin_lock(&sctx
->list_lock
);
1924 sctx
->curr
= sctx
->first_free
;
1925 if (sctx
->curr
!= -1) {
1926 sctx
->first_free
= sctx
->bios
[sctx
->curr
]->next_free
;
1927 sctx
->bios
[sctx
->curr
]->next_free
= -1;
1928 sctx
->bios
[sctx
->curr
]->page_count
= 0;
1929 spin_unlock(&sctx
->list_lock
);
1931 spin_unlock(&sctx
->list_lock
);
1932 wait_event(sctx
->list_wait
, sctx
->first_free
!= -1);
1935 sbio
= sctx
->bios
[sctx
->curr
];
1936 if (sbio
->page_count
== 0) {
1939 sbio
->physical
= spage
->physical
;
1940 sbio
->logical
= spage
->logical
;
1941 sbio
->dev
= spage
->dev
;
1944 bio
= btrfs_io_bio_alloc(GFP_NOFS
, sctx
->pages_per_rd_bio
);
1950 bio
->bi_private
= sbio
;
1951 bio
->bi_end_io
= scrub_bio_end_io
;
1952 bio
->bi_bdev
= sbio
->dev
->bdev
;
1953 bio
->bi_sector
= sbio
->physical
>> 9;
1955 } else if (sbio
->physical
+ sbio
->page_count
* PAGE_SIZE
!=
1957 sbio
->logical
+ sbio
->page_count
* PAGE_SIZE
!=
1959 sbio
->dev
!= spage
->dev
) {
1964 sbio
->pagev
[sbio
->page_count
] = spage
;
1965 ret
= bio_add_page(sbio
->bio
, spage
->page
, PAGE_SIZE
, 0);
1966 if (ret
!= PAGE_SIZE
) {
1967 if (sbio
->page_count
< 1) {
1976 scrub_block_get(sblock
); /* one for the page added to the bio */
1977 atomic_inc(&sblock
->outstanding_pages
);
1979 if (sbio
->page_count
== sctx
->pages_per_rd_bio
)
1985 static int scrub_pages(struct scrub_ctx
*sctx
, u64 logical
, u64 len
,
1986 u64 physical
, struct btrfs_device
*dev
, u64 flags
,
1987 u64 gen
, int mirror_num
, u8
*csum
, int force
,
1988 u64 physical_for_dev_replace
)
1990 struct scrub_block
*sblock
;
1993 sblock
= kzalloc(sizeof(*sblock
), GFP_NOFS
);
1995 spin_lock(&sctx
->stat_lock
);
1996 sctx
->stat
.malloc_errors
++;
1997 spin_unlock(&sctx
->stat_lock
);
2001 /* one ref inside this function, plus one for each page added to
2003 atomic_set(&sblock
->ref_count
, 1);
2004 sblock
->sctx
= sctx
;
2005 sblock
->no_io_error_seen
= 1;
2007 for (index
= 0; len
> 0; index
++) {
2008 struct scrub_page
*spage
;
2009 u64 l
= min_t(u64
, len
, PAGE_SIZE
);
2011 spage
= kzalloc(sizeof(*spage
), GFP_NOFS
);
2014 spin_lock(&sctx
->stat_lock
);
2015 sctx
->stat
.malloc_errors
++;
2016 spin_unlock(&sctx
->stat_lock
);
2017 scrub_block_put(sblock
);
2020 BUG_ON(index
>= SCRUB_MAX_PAGES_PER_BLOCK
);
2021 scrub_page_get(spage
);
2022 sblock
->pagev
[index
] = spage
;
2023 spage
->sblock
= sblock
;
2025 spage
->flags
= flags
;
2026 spage
->generation
= gen
;
2027 spage
->logical
= logical
;
2028 spage
->physical
= physical
;
2029 spage
->physical_for_dev_replace
= physical_for_dev_replace
;
2030 spage
->mirror_num
= mirror_num
;
2032 spage
->have_csum
= 1;
2033 memcpy(spage
->csum
, csum
, sctx
->csum_size
);
2035 spage
->have_csum
= 0;
2037 sblock
->page_count
++;
2038 spage
->page
= alloc_page(GFP_NOFS
);
2044 physical_for_dev_replace
+= l
;
2047 WARN_ON(sblock
->page_count
== 0);
2048 for (index
= 0; index
< sblock
->page_count
; index
++) {
2049 struct scrub_page
*spage
= sblock
->pagev
[index
];
2052 ret
= scrub_add_page_to_rd_bio(sctx
, spage
);
2054 scrub_block_put(sblock
);
2062 /* last one frees, either here or in bio completion for last page */
2063 scrub_block_put(sblock
);
2067 static void scrub_bio_end_io(struct bio
*bio
, int err
)
2069 struct scrub_bio
*sbio
= bio
->bi_private
;
2070 struct btrfs_fs_info
*fs_info
= sbio
->dev
->dev_root
->fs_info
;
2075 btrfs_queue_worker(&fs_info
->scrub_workers
, &sbio
->work
);
2078 static void scrub_bio_end_io_worker(struct btrfs_work
*work
)
2080 struct scrub_bio
*sbio
= container_of(work
, struct scrub_bio
, work
);
2081 struct scrub_ctx
*sctx
= sbio
->sctx
;
2084 BUG_ON(sbio
->page_count
> SCRUB_PAGES_PER_RD_BIO
);
2086 for (i
= 0; i
< sbio
->page_count
; i
++) {
2087 struct scrub_page
*spage
= sbio
->pagev
[i
];
2089 spage
->io_error
= 1;
2090 spage
->sblock
->no_io_error_seen
= 0;
2094 /* now complete the scrub_block items that have all pages completed */
2095 for (i
= 0; i
< sbio
->page_count
; i
++) {
2096 struct scrub_page
*spage
= sbio
->pagev
[i
];
2097 struct scrub_block
*sblock
= spage
->sblock
;
2099 if (atomic_dec_and_test(&sblock
->outstanding_pages
))
2100 scrub_block_complete(sblock
);
2101 scrub_block_put(sblock
);
2106 spin_lock(&sctx
->list_lock
);
2107 sbio
->next_free
= sctx
->first_free
;
2108 sctx
->first_free
= sbio
->index
;
2109 spin_unlock(&sctx
->list_lock
);
2111 if (sctx
->is_dev_replace
&&
2112 atomic_read(&sctx
->wr_ctx
.flush_all_writes
)) {
2113 mutex_lock(&sctx
->wr_ctx
.wr_lock
);
2114 scrub_wr_submit(sctx
);
2115 mutex_unlock(&sctx
->wr_ctx
.wr_lock
);
2118 scrub_pending_bio_dec(sctx
);
2121 static void scrub_block_complete(struct scrub_block
*sblock
)
2123 if (!sblock
->no_io_error_seen
) {
2124 scrub_handle_errored_block(sblock
);
2127 * if has checksum error, write via repair mechanism in
2128 * dev replace case, otherwise write here in dev replace
2131 if (!scrub_checksum(sblock
) && sblock
->sctx
->is_dev_replace
)
2132 scrub_write_block_to_dev_replace(sblock
);
2136 static int scrub_find_csum(struct scrub_ctx
*sctx
, u64 logical
, u64 len
,
2139 struct btrfs_ordered_sum
*sum
= NULL
;
2140 unsigned long index
;
2141 unsigned long num_sectors
;
2143 while (!list_empty(&sctx
->csum_list
)) {
2144 sum
= list_first_entry(&sctx
->csum_list
,
2145 struct btrfs_ordered_sum
, list
);
2146 if (sum
->bytenr
> logical
)
2148 if (sum
->bytenr
+ sum
->len
> logical
)
2151 ++sctx
->stat
.csum_discards
;
2152 list_del(&sum
->list
);
2159 index
= ((u32
)(logical
- sum
->bytenr
)) / sctx
->sectorsize
;
2160 num_sectors
= sum
->len
/ sctx
->sectorsize
;
2161 memcpy(csum
, sum
->sums
+ index
, sctx
->csum_size
);
2162 if (index
== num_sectors
- 1) {
2163 list_del(&sum
->list
);
2169 /* scrub extent tries to collect up to 64 kB for each bio */
2170 static int scrub_extent(struct scrub_ctx
*sctx
, u64 logical
, u64 len
,
2171 u64 physical
, struct btrfs_device
*dev
, u64 flags
,
2172 u64 gen
, int mirror_num
, u64 physical_for_dev_replace
)
2175 u8 csum
[BTRFS_CSUM_SIZE
];
2178 if (flags
& BTRFS_EXTENT_FLAG_DATA
) {
2179 blocksize
= sctx
->sectorsize
;
2180 spin_lock(&sctx
->stat_lock
);
2181 sctx
->stat
.data_extents_scrubbed
++;
2182 sctx
->stat
.data_bytes_scrubbed
+= len
;
2183 spin_unlock(&sctx
->stat_lock
);
2184 } else if (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
) {
2185 WARN_ON(sctx
->nodesize
!= sctx
->leafsize
);
2186 blocksize
= sctx
->nodesize
;
2187 spin_lock(&sctx
->stat_lock
);
2188 sctx
->stat
.tree_extents_scrubbed
++;
2189 sctx
->stat
.tree_bytes_scrubbed
+= len
;
2190 spin_unlock(&sctx
->stat_lock
);
2192 blocksize
= sctx
->sectorsize
;
2197 u64 l
= min_t(u64
, len
, blocksize
);
2200 if (flags
& BTRFS_EXTENT_FLAG_DATA
) {
2201 /* push csums to sbio */
2202 have_csum
= scrub_find_csum(sctx
, logical
, l
, csum
);
2204 ++sctx
->stat
.no_csum
;
2205 if (sctx
->is_dev_replace
&& !have_csum
) {
2206 ret
= copy_nocow_pages(sctx
, logical
, l
,
2208 physical_for_dev_replace
);
2209 goto behind_scrub_pages
;
2212 ret
= scrub_pages(sctx
, logical
, l
, physical
, dev
, flags
, gen
,
2213 mirror_num
, have_csum
? csum
: NULL
, 0,
2214 physical_for_dev_replace
);
2221 physical_for_dev_replace
+= l
;
2226 static noinline_for_stack
int scrub_stripe(struct scrub_ctx
*sctx
,
2227 struct map_lookup
*map
,
2228 struct btrfs_device
*scrub_dev
,
2229 int num
, u64 base
, u64 length
,
2232 struct btrfs_path
*path
;
2233 struct btrfs_fs_info
*fs_info
= sctx
->dev_root
->fs_info
;
2234 struct btrfs_root
*root
= fs_info
->extent_root
;
2235 struct btrfs_root
*csum_root
= fs_info
->csum_root
;
2236 struct btrfs_extent_item
*extent
;
2237 struct blk_plug plug
;
2242 struct extent_buffer
*l
;
2243 struct btrfs_key key
;
2249 struct reada_control
*reada1
;
2250 struct reada_control
*reada2
;
2251 struct btrfs_key key_start
;
2252 struct btrfs_key key_end
;
2253 u64 increment
= map
->stripe_len
;
2256 u64 extent_physical
;
2258 struct btrfs_device
*extent_dev
;
2259 int extent_mirror_num
;
2262 if (map
->type
& (BTRFS_BLOCK_GROUP_RAID5
|
2263 BTRFS_BLOCK_GROUP_RAID6
)) {
2264 if (num
>= nr_data_stripes(map
)) {
2271 do_div(nstripes
, map
->stripe_len
);
2272 if (map
->type
& BTRFS_BLOCK_GROUP_RAID0
) {
2273 offset
= map
->stripe_len
* num
;
2274 increment
= map
->stripe_len
* map
->num_stripes
;
2276 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID10
) {
2277 int factor
= map
->num_stripes
/ map
->sub_stripes
;
2278 offset
= map
->stripe_len
* (num
/ map
->sub_stripes
);
2279 increment
= map
->stripe_len
* factor
;
2280 mirror_num
= num
% map
->sub_stripes
+ 1;
2281 } else if (map
->type
& BTRFS_BLOCK_GROUP_RAID1
) {
2282 increment
= map
->stripe_len
;
2283 mirror_num
= num
% map
->num_stripes
+ 1;
2284 } else if (map
->type
& BTRFS_BLOCK_GROUP_DUP
) {
2285 increment
= map
->stripe_len
;
2286 mirror_num
= num
% map
->num_stripes
+ 1;
2288 increment
= map
->stripe_len
;
2292 path
= btrfs_alloc_path();
2297 * work on commit root. The related disk blocks are static as
2298 * long as COW is applied. This means, it is save to rewrite
2299 * them to repair disk errors without any race conditions
2301 path
->search_commit_root
= 1;
2302 path
->skip_locking
= 1;
2305 * trigger the readahead for extent tree csum tree and wait for
2306 * completion. During readahead, the scrub is officially paused
2307 * to not hold off transaction commits
2309 logical
= base
+ offset
;
2311 wait_event(sctx
->list_wait
,
2312 atomic_read(&sctx
->bios_in_flight
) == 0);
2313 scrub_blocked_if_needed(fs_info
);
2315 /* FIXME it might be better to start readahead at commit root */
2316 key_start
.objectid
= logical
;
2317 key_start
.type
= BTRFS_EXTENT_ITEM_KEY
;
2318 key_start
.offset
= (u64
)0;
2319 key_end
.objectid
= base
+ offset
+ nstripes
* increment
;
2320 key_end
.type
= BTRFS_METADATA_ITEM_KEY
;
2321 key_end
.offset
= (u64
)-1;
2322 reada1
= btrfs_reada_add(root
, &key_start
, &key_end
);
2324 key_start
.objectid
= BTRFS_EXTENT_CSUM_OBJECTID
;
2325 key_start
.type
= BTRFS_EXTENT_CSUM_KEY
;
2326 key_start
.offset
= logical
;
2327 key_end
.objectid
= BTRFS_EXTENT_CSUM_OBJECTID
;
2328 key_end
.type
= BTRFS_EXTENT_CSUM_KEY
;
2329 key_end
.offset
= base
+ offset
+ nstripes
* increment
;
2330 reada2
= btrfs_reada_add(csum_root
, &key_start
, &key_end
);
2332 if (!IS_ERR(reada1
))
2333 btrfs_reada_wait(reada1
);
2334 if (!IS_ERR(reada2
))
2335 btrfs_reada_wait(reada2
);
2339 * collect all data csums for the stripe to avoid seeking during
2340 * the scrub. This might currently (crc32) end up to be about 1MB
2342 blk_start_plug(&plug
);
2345 * now find all extents for each stripe and scrub them
2347 logical
= base
+ offset
;
2348 physical
= map
->stripes
[num
].physical
;
2349 logic_end
= logical
+ increment
* nstripes
;
2351 while (logical
< logic_end
) {
2355 if (atomic_read(&fs_info
->scrub_cancel_req
) ||
2356 atomic_read(&sctx
->cancel_req
)) {
2361 * check to see if we have to pause
2363 if (atomic_read(&fs_info
->scrub_pause_req
)) {
2364 /* push queued extents */
2365 atomic_set(&sctx
->wr_ctx
.flush_all_writes
, 1);
2367 mutex_lock(&sctx
->wr_ctx
.wr_lock
);
2368 scrub_wr_submit(sctx
);
2369 mutex_unlock(&sctx
->wr_ctx
.wr_lock
);
2370 wait_event(sctx
->list_wait
,
2371 atomic_read(&sctx
->bios_in_flight
) == 0);
2372 atomic_set(&sctx
->wr_ctx
.flush_all_writes
, 0);
2373 scrub_blocked_if_needed(fs_info
);
2376 key
.objectid
= logical
;
2377 key
.type
= BTRFS_EXTENT_ITEM_KEY
;
2378 key
.offset
= (u64
)-1;
2380 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2385 ret
= btrfs_previous_item(root
, path
, 0,
2386 BTRFS_EXTENT_ITEM_KEY
);
2390 /* there's no smaller item, so stick with the
2392 btrfs_release_path(path
);
2393 ret
= btrfs_search_slot(NULL
, root
, &key
,
2405 slot
= path
->slots
[0];
2406 if (slot
>= btrfs_header_nritems(l
)) {
2407 ret
= btrfs_next_leaf(root
, path
);
2416 btrfs_item_key_to_cpu(l
, &key
, slot
);
2418 if (key
.type
== BTRFS_METADATA_ITEM_KEY
)
2419 bytes
= root
->leafsize
;
2423 if (key
.objectid
+ bytes
<= logical
)
2426 if (key
.type
!= BTRFS_EXTENT_ITEM_KEY
&&
2427 key
.type
!= BTRFS_METADATA_ITEM_KEY
)
2430 if (key
.objectid
>= logical
+ map
->stripe_len
) {
2431 /* out of this device extent */
2432 if (key
.objectid
>= logic_end
)
2437 extent
= btrfs_item_ptr(l
, slot
,
2438 struct btrfs_extent_item
);
2439 flags
= btrfs_extent_flags(l
, extent
);
2440 generation
= btrfs_extent_generation(l
, extent
);
2442 if (key
.objectid
< logical
&&
2443 (flags
& BTRFS_EXTENT_FLAG_TREE_BLOCK
)) {
2445 "scrub: tree block %llu spanning "
2446 "stripes, ignored. logical=%llu",
2447 key
.objectid
, logical
);
2452 extent_logical
= key
.objectid
;
2456 * trim extent to this stripe
2458 if (extent_logical
< logical
) {
2459 extent_len
-= logical
- extent_logical
;
2460 extent_logical
= logical
;
2462 if (extent_logical
+ extent_len
>
2463 logical
+ map
->stripe_len
) {
2464 extent_len
= logical
+ map
->stripe_len
-
2468 extent_physical
= extent_logical
- logical
+ physical
;
2469 extent_dev
= scrub_dev
;
2470 extent_mirror_num
= mirror_num
;
2472 scrub_remap_extent(fs_info
, extent_logical
,
2473 extent_len
, &extent_physical
,
2475 &extent_mirror_num
);
2477 ret
= btrfs_lookup_csums_range(csum_root
, logical
,
2478 logical
+ map
->stripe_len
- 1,
2479 &sctx
->csum_list
, 1);
2483 ret
= scrub_extent(sctx
, extent_logical
, extent_len
,
2484 extent_physical
, extent_dev
, flags
,
2485 generation
, extent_mirror_num
,
2486 extent_logical
- logical
+ physical
);
2490 scrub_free_csums(sctx
);
2491 if (extent_logical
+ extent_len
<
2492 key
.objectid
+ bytes
) {
2493 logical
+= increment
;
2494 physical
+= map
->stripe_len
;
2496 if (logical
< key
.objectid
+ bytes
) {
2501 if (logical
>= logic_end
) {
2509 btrfs_release_path(path
);
2510 logical
+= increment
;
2511 physical
+= map
->stripe_len
;
2512 spin_lock(&sctx
->stat_lock
);
2514 sctx
->stat
.last_physical
= map
->stripes
[num
].physical
+
2517 sctx
->stat
.last_physical
= physical
;
2518 spin_unlock(&sctx
->stat_lock
);
2523 /* push queued extents */
2525 mutex_lock(&sctx
->wr_ctx
.wr_lock
);
2526 scrub_wr_submit(sctx
);
2527 mutex_unlock(&sctx
->wr_ctx
.wr_lock
);
2529 blk_finish_plug(&plug
);
2530 btrfs_free_path(path
);
2531 return ret
< 0 ? ret
: 0;
2534 static noinline_for_stack
int scrub_chunk(struct scrub_ctx
*sctx
,
2535 struct btrfs_device
*scrub_dev
,
2536 u64 chunk_tree
, u64 chunk_objectid
,
2537 u64 chunk_offset
, u64 length
,
2538 u64 dev_offset
, int is_dev_replace
)
2540 struct btrfs_mapping_tree
*map_tree
=
2541 &sctx
->dev_root
->fs_info
->mapping_tree
;
2542 struct map_lookup
*map
;
2543 struct extent_map
*em
;
2547 read_lock(&map_tree
->map_tree
.lock
);
2548 em
= lookup_extent_mapping(&map_tree
->map_tree
, chunk_offset
, 1);
2549 read_unlock(&map_tree
->map_tree
.lock
);
2554 map
= (struct map_lookup
*)em
->bdev
;
2555 if (em
->start
!= chunk_offset
)
2558 if (em
->len
< length
)
2561 for (i
= 0; i
< map
->num_stripes
; ++i
) {
2562 if (map
->stripes
[i
].dev
->bdev
== scrub_dev
->bdev
&&
2563 map
->stripes
[i
].physical
== dev_offset
) {
2564 ret
= scrub_stripe(sctx
, map
, scrub_dev
, i
,
2565 chunk_offset
, length
,
2572 free_extent_map(em
);
2577 static noinline_for_stack
2578 int scrub_enumerate_chunks(struct scrub_ctx
*sctx
,
2579 struct btrfs_device
*scrub_dev
, u64 start
, u64 end
,
2582 struct btrfs_dev_extent
*dev_extent
= NULL
;
2583 struct btrfs_path
*path
;
2584 struct btrfs_root
*root
= sctx
->dev_root
;
2585 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2592 struct extent_buffer
*l
;
2593 struct btrfs_key key
;
2594 struct btrfs_key found_key
;
2595 struct btrfs_block_group_cache
*cache
;
2596 struct btrfs_dev_replace
*dev_replace
= &fs_info
->dev_replace
;
2598 path
= btrfs_alloc_path();
2603 path
->search_commit_root
= 1;
2604 path
->skip_locking
= 1;
2606 key
.objectid
= scrub_dev
->devid
;
2608 key
.type
= BTRFS_DEV_EXTENT_KEY
;
2611 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
2615 if (path
->slots
[0] >=
2616 btrfs_header_nritems(path
->nodes
[0])) {
2617 ret
= btrfs_next_leaf(root
, path
);
2624 slot
= path
->slots
[0];
2626 btrfs_item_key_to_cpu(l
, &found_key
, slot
);
2628 if (found_key
.objectid
!= scrub_dev
->devid
)
2631 if (btrfs_key_type(&found_key
) != BTRFS_DEV_EXTENT_KEY
)
2634 if (found_key
.offset
>= end
)
2637 if (found_key
.offset
< key
.offset
)
2640 dev_extent
= btrfs_item_ptr(l
, slot
, struct btrfs_dev_extent
);
2641 length
= btrfs_dev_extent_length(l
, dev_extent
);
2643 if (found_key
.offset
+ length
<= start
) {
2644 key
.offset
= found_key
.offset
+ length
;
2645 btrfs_release_path(path
);
2649 chunk_tree
= btrfs_dev_extent_chunk_tree(l
, dev_extent
);
2650 chunk_objectid
= btrfs_dev_extent_chunk_objectid(l
, dev_extent
);
2651 chunk_offset
= btrfs_dev_extent_chunk_offset(l
, dev_extent
);
2654 * get a reference on the corresponding block group to prevent
2655 * the chunk from going away while we scrub it
2657 cache
= btrfs_lookup_block_group(fs_info
, chunk_offset
);
2662 dev_replace
->cursor_right
= found_key
.offset
+ length
;
2663 dev_replace
->cursor_left
= found_key
.offset
;
2664 dev_replace
->item_needs_writeback
= 1;
2665 ret
= scrub_chunk(sctx
, scrub_dev
, chunk_tree
, chunk_objectid
,
2666 chunk_offset
, length
, found_key
.offset
,
2670 * flush, submit all pending read and write bios, afterwards
2672 * Note that in the dev replace case, a read request causes
2673 * write requests that are submitted in the read completion
2674 * worker. Therefore in the current situation, it is required
2675 * that all write requests are flushed, so that all read and
2676 * write requests are really completed when bios_in_flight
2679 atomic_set(&sctx
->wr_ctx
.flush_all_writes
, 1);
2681 mutex_lock(&sctx
->wr_ctx
.wr_lock
);
2682 scrub_wr_submit(sctx
);
2683 mutex_unlock(&sctx
->wr_ctx
.wr_lock
);
2685 wait_event(sctx
->list_wait
,
2686 atomic_read(&sctx
->bios_in_flight
) == 0);
2687 atomic_set(&sctx
->wr_ctx
.flush_all_writes
, 0);
2688 wait_event(sctx
->list_wait
,
2689 atomic_read(&sctx
->workers_pending
) == 0);
2690 scrub_blocked_if_needed(fs_info
);
2692 btrfs_put_block_group(cache
);
2695 if (is_dev_replace
&&
2696 atomic64_read(&dev_replace
->num_write_errors
) > 0) {
2700 if (sctx
->stat
.malloc_errors
> 0) {
2705 dev_replace
->cursor_left
= dev_replace
->cursor_right
;
2706 dev_replace
->item_needs_writeback
= 1;
2708 key
.offset
= found_key
.offset
+ length
;
2709 btrfs_release_path(path
);
2712 btrfs_free_path(path
);
2715 * ret can still be 1 from search_slot or next_leaf,
2716 * that's not an error
2718 return ret
< 0 ? ret
: 0;
2721 static noinline_for_stack
int scrub_supers(struct scrub_ctx
*sctx
,
2722 struct btrfs_device
*scrub_dev
)
2728 struct btrfs_root
*root
= sctx
->dev_root
;
2730 if (test_bit(BTRFS_FS_STATE_ERROR
, &root
->fs_info
->fs_state
))
2733 gen
= root
->fs_info
->last_trans_committed
;
2735 for (i
= 0; i
< BTRFS_SUPER_MIRROR_MAX
; i
++) {
2736 bytenr
= btrfs_sb_offset(i
);
2737 if (bytenr
+ BTRFS_SUPER_INFO_SIZE
> scrub_dev
->total_bytes
)
2740 ret
= scrub_pages(sctx
, bytenr
, BTRFS_SUPER_INFO_SIZE
, bytenr
,
2741 scrub_dev
, BTRFS_EXTENT_FLAG_SUPER
, gen
, i
,
2746 wait_event(sctx
->list_wait
, atomic_read(&sctx
->bios_in_flight
) == 0);
2752 * get a reference count on fs_info->scrub_workers. start worker if necessary
2754 static noinline_for_stack
int scrub_workers_get(struct btrfs_fs_info
*fs_info
,
2759 if (fs_info
->scrub_workers_refcnt
== 0) {
2761 btrfs_init_workers(&fs_info
->scrub_workers
, "scrub", 1,
2762 &fs_info
->generic_worker
);
2764 btrfs_init_workers(&fs_info
->scrub_workers
, "scrub",
2765 fs_info
->thread_pool_size
,
2766 &fs_info
->generic_worker
);
2767 fs_info
->scrub_workers
.idle_thresh
= 4;
2768 ret
= btrfs_start_workers(&fs_info
->scrub_workers
);
2771 btrfs_init_workers(&fs_info
->scrub_wr_completion_workers
,
2773 fs_info
->thread_pool_size
,
2774 &fs_info
->generic_worker
);
2775 fs_info
->scrub_wr_completion_workers
.idle_thresh
= 2;
2776 ret
= btrfs_start_workers(
2777 &fs_info
->scrub_wr_completion_workers
);
2780 btrfs_init_workers(&fs_info
->scrub_nocow_workers
, "scrubnc", 1,
2781 &fs_info
->generic_worker
);
2782 ret
= btrfs_start_workers(&fs_info
->scrub_nocow_workers
);
2786 ++fs_info
->scrub_workers_refcnt
;
2791 static noinline_for_stack
void scrub_workers_put(struct btrfs_fs_info
*fs_info
)
2793 if (--fs_info
->scrub_workers_refcnt
== 0) {
2794 btrfs_stop_workers(&fs_info
->scrub_workers
);
2795 btrfs_stop_workers(&fs_info
->scrub_wr_completion_workers
);
2796 btrfs_stop_workers(&fs_info
->scrub_nocow_workers
);
2798 WARN_ON(fs_info
->scrub_workers_refcnt
< 0);
2801 int btrfs_scrub_dev(struct btrfs_fs_info
*fs_info
, u64 devid
, u64 start
,
2802 u64 end
, struct btrfs_scrub_progress
*progress
,
2803 int readonly
, int is_dev_replace
)
2805 struct scrub_ctx
*sctx
;
2807 struct btrfs_device
*dev
;
2809 if (btrfs_fs_closing(fs_info
))
2813 * check some assumptions
2815 if (fs_info
->chunk_root
->nodesize
!= fs_info
->chunk_root
->leafsize
) {
2817 "scrub: size assumption nodesize == leafsize (%d == %d) fails",
2818 fs_info
->chunk_root
->nodesize
,
2819 fs_info
->chunk_root
->leafsize
);
2823 if (fs_info
->chunk_root
->nodesize
> BTRFS_STRIPE_LEN
) {
2825 * in this case scrub is unable to calculate the checksum
2826 * the way scrub is implemented. Do not handle this
2827 * situation at all because it won't ever happen.
2830 "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails",
2831 fs_info
->chunk_root
->nodesize
, BTRFS_STRIPE_LEN
);
2835 if (fs_info
->chunk_root
->sectorsize
!= PAGE_SIZE
) {
2836 /* not supported for data w/o checksums */
2838 "scrub: size assumption sectorsize != PAGE_SIZE "
2839 "(%d != %lu) fails",
2840 fs_info
->chunk_root
->sectorsize
, PAGE_SIZE
);
2844 if (fs_info
->chunk_root
->nodesize
>
2845 PAGE_SIZE
* SCRUB_MAX_PAGES_PER_BLOCK
||
2846 fs_info
->chunk_root
->sectorsize
>
2847 PAGE_SIZE
* SCRUB_MAX_PAGES_PER_BLOCK
) {
2849 * would exhaust the array bounds of pagev member in
2850 * struct scrub_block
2852 btrfs_err(fs_info
, "scrub: size assumption nodesize and sectorsize "
2853 "<= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails",
2854 fs_info
->chunk_root
->nodesize
,
2855 SCRUB_MAX_PAGES_PER_BLOCK
,
2856 fs_info
->chunk_root
->sectorsize
,
2857 SCRUB_MAX_PAGES_PER_BLOCK
);
2862 mutex_lock(&fs_info
->fs_devices
->device_list_mutex
);
2863 dev
= btrfs_find_device(fs_info
, devid
, NULL
, NULL
);
2864 if (!dev
|| (dev
->missing
&& !is_dev_replace
)) {
2865 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2869 mutex_lock(&fs_info
->scrub_lock
);
2870 if (!dev
->in_fs_metadata
|| dev
->is_tgtdev_for_dev_replace
) {
2871 mutex_unlock(&fs_info
->scrub_lock
);
2872 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2876 btrfs_dev_replace_lock(&fs_info
->dev_replace
);
2877 if (dev
->scrub_device
||
2879 btrfs_dev_replace_is_ongoing(&fs_info
->dev_replace
))) {
2880 btrfs_dev_replace_unlock(&fs_info
->dev_replace
);
2881 mutex_unlock(&fs_info
->scrub_lock
);
2882 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2883 return -EINPROGRESS
;
2885 btrfs_dev_replace_unlock(&fs_info
->dev_replace
);
2887 ret
= scrub_workers_get(fs_info
, is_dev_replace
);
2889 mutex_unlock(&fs_info
->scrub_lock
);
2890 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2894 sctx
= scrub_setup_ctx(dev
, is_dev_replace
);
2896 mutex_unlock(&fs_info
->scrub_lock
);
2897 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2898 scrub_workers_put(fs_info
);
2899 return PTR_ERR(sctx
);
2901 sctx
->readonly
= readonly
;
2902 dev
->scrub_device
= sctx
;
2903 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2906 * checking @scrub_pause_req here, we can avoid
2907 * race between committing transaction and scrubbing.
2909 __scrub_blocked_if_needed(fs_info
);
2910 atomic_inc(&fs_info
->scrubs_running
);
2911 mutex_unlock(&fs_info
->scrub_lock
);
2913 if (!is_dev_replace
) {
2915 * by holding device list mutex, we can
2916 * kick off writing super in log tree sync.
2918 mutex_lock(&fs_info
->fs_devices
->device_list_mutex
);
2919 ret
= scrub_supers(sctx
, dev
);
2920 mutex_unlock(&fs_info
->fs_devices
->device_list_mutex
);
2924 ret
= scrub_enumerate_chunks(sctx
, dev
, start
, end
,
2927 wait_event(sctx
->list_wait
, atomic_read(&sctx
->bios_in_flight
) == 0);
2928 atomic_dec(&fs_info
->scrubs_running
);
2929 wake_up(&fs_info
->scrub_pause_wait
);
2931 wait_event(sctx
->list_wait
, atomic_read(&sctx
->workers_pending
) == 0);
2934 memcpy(progress
, &sctx
->stat
, sizeof(*progress
));
2936 mutex_lock(&fs_info
->scrub_lock
);
2937 dev
->scrub_device
= NULL
;
2938 scrub_workers_put(fs_info
);
2939 mutex_unlock(&fs_info
->scrub_lock
);
2941 scrub_free_ctx(sctx
);
2946 void btrfs_scrub_pause(struct btrfs_root
*root
)
2948 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2950 mutex_lock(&fs_info
->scrub_lock
);
2951 atomic_inc(&fs_info
->scrub_pause_req
);
2952 while (atomic_read(&fs_info
->scrubs_paused
) !=
2953 atomic_read(&fs_info
->scrubs_running
)) {
2954 mutex_unlock(&fs_info
->scrub_lock
);
2955 wait_event(fs_info
->scrub_pause_wait
,
2956 atomic_read(&fs_info
->scrubs_paused
) ==
2957 atomic_read(&fs_info
->scrubs_running
));
2958 mutex_lock(&fs_info
->scrub_lock
);
2960 mutex_unlock(&fs_info
->scrub_lock
);
2963 void btrfs_scrub_continue(struct btrfs_root
*root
)
2965 struct btrfs_fs_info
*fs_info
= root
->fs_info
;
2967 atomic_dec(&fs_info
->scrub_pause_req
);
2968 wake_up(&fs_info
->scrub_pause_wait
);
2971 int btrfs_scrub_cancel(struct btrfs_fs_info
*fs_info
)
2973 mutex_lock(&fs_info
->scrub_lock
);
2974 if (!atomic_read(&fs_info
->scrubs_running
)) {
2975 mutex_unlock(&fs_info
->scrub_lock
);
2979 atomic_inc(&fs_info
->scrub_cancel_req
);
2980 while (atomic_read(&fs_info
->scrubs_running
)) {
2981 mutex_unlock(&fs_info
->scrub_lock
);
2982 wait_event(fs_info
->scrub_pause_wait
,
2983 atomic_read(&fs_info
->scrubs_running
) == 0);
2984 mutex_lock(&fs_info
->scrub_lock
);
2986 atomic_dec(&fs_info
->scrub_cancel_req
);
2987 mutex_unlock(&fs_info
->scrub_lock
);
2992 int btrfs_scrub_cancel_dev(struct btrfs_fs_info
*fs_info
,
2993 struct btrfs_device
*dev
)
2995 struct scrub_ctx
*sctx
;
2997 mutex_lock(&fs_info
->scrub_lock
);
2998 sctx
= dev
->scrub_device
;
3000 mutex_unlock(&fs_info
->scrub_lock
);
3003 atomic_inc(&sctx
->cancel_req
);
3004 while (dev
->scrub_device
) {
3005 mutex_unlock(&fs_info
->scrub_lock
);
3006 wait_event(fs_info
->scrub_pause_wait
,
3007 dev
->scrub_device
== NULL
);
3008 mutex_lock(&fs_info
->scrub_lock
);
3010 mutex_unlock(&fs_info
->scrub_lock
);
3015 int btrfs_scrub_progress(struct btrfs_root
*root
, u64 devid
,
3016 struct btrfs_scrub_progress
*progress
)
3018 struct btrfs_device
*dev
;
3019 struct scrub_ctx
*sctx
= NULL
;
3021 mutex_lock(&root
->fs_info
->fs_devices
->device_list_mutex
);
3022 dev
= btrfs_find_device(root
->fs_info
, devid
, NULL
, NULL
);
3024 sctx
= dev
->scrub_device
;
3026 memcpy(progress
, &sctx
->stat
, sizeof(*progress
));
3027 mutex_unlock(&root
->fs_info
->fs_devices
->device_list_mutex
);
3029 return dev
? (sctx
? 0 : -ENOTCONN
) : -ENODEV
;
3032 static void scrub_remap_extent(struct btrfs_fs_info
*fs_info
,
3033 u64 extent_logical
, u64 extent_len
,
3034 u64
*extent_physical
,
3035 struct btrfs_device
**extent_dev
,
3036 int *extent_mirror_num
)
3039 struct btrfs_bio
*bbio
= NULL
;
3042 mapped_length
= extent_len
;
3043 ret
= btrfs_map_block(fs_info
, READ
, extent_logical
,
3044 &mapped_length
, &bbio
, 0);
3045 if (ret
|| !bbio
|| mapped_length
< extent_len
||
3046 !bbio
->stripes
[0].dev
->bdev
) {
3051 *extent_physical
= bbio
->stripes
[0].physical
;
3052 *extent_mirror_num
= bbio
->mirror_num
;
3053 *extent_dev
= bbio
->stripes
[0].dev
;
3057 static int scrub_setup_wr_ctx(struct scrub_ctx
*sctx
,
3058 struct scrub_wr_ctx
*wr_ctx
,
3059 struct btrfs_fs_info
*fs_info
,
3060 struct btrfs_device
*dev
,
3063 WARN_ON(wr_ctx
->wr_curr_bio
!= NULL
);
3065 mutex_init(&wr_ctx
->wr_lock
);
3066 wr_ctx
->wr_curr_bio
= NULL
;
3067 if (!is_dev_replace
)
3070 WARN_ON(!dev
->bdev
);
3071 wr_ctx
->pages_per_wr_bio
= min_t(int, SCRUB_PAGES_PER_WR_BIO
,
3072 bio_get_nr_vecs(dev
->bdev
));
3073 wr_ctx
->tgtdev
= dev
;
3074 atomic_set(&wr_ctx
->flush_all_writes
, 0);
3078 static void scrub_free_wr_ctx(struct scrub_wr_ctx
*wr_ctx
)
3080 mutex_lock(&wr_ctx
->wr_lock
);
3081 kfree(wr_ctx
->wr_curr_bio
);
3082 wr_ctx
->wr_curr_bio
= NULL
;
3083 mutex_unlock(&wr_ctx
->wr_lock
);
3086 static int copy_nocow_pages(struct scrub_ctx
*sctx
, u64 logical
, u64 len
,
3087 int mirror_num
, u64 physical_for_dev_replace
)
3089 struct scrub_copy_nocow_ctx
*nocow_ctx
;
3090 struct btrfs_fs_info
*fs_info
= sctx
->dev_root
->fs_info
;
3092 nocow_ctx
= kzalloc(sizeof(*nocow_ctx
), GFP_NOFS
);
3094 spin_lock(&sctx
->stat_lock
);
3095 sctx
->stat
.malloc_errors
++;
3096 spin_unlock(&sctx
->stat_lock
);
3100 scrub_pending_trans_workers_inc(sctx
);
3102 nocow_ctx
->sctx
= sctx
;
3103 nocow_ctx
->logical
= logical
;
3104 nocow_ctx
->len
= len
;
3105 nocow_ctx
->mirror_num
= mirror_num
;
3106 nocow_ctx
->physical_for_dev_replace
= physical_for_dev_replace
;
3107 nocow_ctx
->work
.func
= copy_nocow_pages_worker
;
3108 INIT_LIST_HEAD(&nocow_ctx
->inodes
);
3109 btrfs_queue_worker(&fs_info
->scrub_nocow_workers
,
3115 static int record_inode_for_nocow(u64 inum
, u64 offset
, u64 root
, void *ctx
)
3117 struct scrub_copy_nocow_ctx
*nocow_ctx
= ctx
;
3118 struct scrub_nocow_inode
*nocow_inode
;
3120 nocow_inode
= kzalloc(sizeof(*nocow_inode
), GFP_NOFS
);
3123 nocow_inode
->inum
= inum
;
3124 nocow_inode
->offset
= offset
;
3125 nocow_inode
->root
= root
;
3126 list_add_tail(&nocow_inode
->list
, &nocow_ctx
->inodes
);
3130 #define COPY_COMPLETE 1
3132 static void copy_nocow_pages_worker(struct btrfs_work
*work
)
3134 struct scrub_copy_nocow_ctx
*nocow_ctx
=
3135 container_of(work
, struct scrub_copy_nocow_ctx
, work
);
3136 struct scrub_ctx
*sctx
= nocow_ctx
->sctx
;
3137 u64 logical
= nocow_ctx
->logical
;
3138 u64 len
= nocow_ctx
->len
;
3139 int mirror_num
= nocow_ctx
->mirror_num
;
3140 u64 physical_for_dev_replace
= nocow_ctx
->physical_for_dev_replace
;
3142 struct btrfs_trans_handle
*trans
= NULL
;
3143 struct btrfs_fs_info
*fs_info
;
3144 struct btrfs_path
*path
;
3145 struct btrfs_root
*root
;
3146 int not_written
= 0;
3148 fs_info
= sctx
->dev_root
->fs_info
;
3149 root
= fs_info
->extent_root
;
3151 path
= btrfs_alloc_path();
3153 spin_lock(&sctx
->stat_lock
);
3154 sctx
->stat
.malloc_errors
++;
3155 spin_unlock(&sctx
->stat_lock
);
3160 trans
= btrfs_join_transaction(root
);
3161 if (IS_ERR(trans
)) {
3166 ret
= iterate_inodes_from_logical(logical
, fs_info
, path
,
3167 record_inode_for_nocow
, nocow_ctx
);
3168 if (ret
!= 0 && ret
!= -ENOENT
) {
3169 btrfs_warn(fs_info
, "iterate_inodes_from_logical() failed: log %llu, "
3170 "phys %llu, len %llu, mir %u, ret %d",
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 btrfs_err(fs_info
, "find_or_create_page() failed");
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
;