1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (C) 2011, 2012 STRATO. All rights reserved.
6 #include <linux/blkdev.h>
7 #include <linux/ratelimit.h>
8 #include <linux/sched/mm.h>
9 #include <crypto/hash.h>
14 #include "ordered-data.h"
15 #include "transaction.h"
17 #include "extent_io.h"
18 #include "dev-replace.h"
19 #include "check-integrity.h"
20 #include "rcu-string.h"
22 #include "block-group.h"
26 * This is only the first step towards a full-features scrub. It reads all
27 * extent and super block and verifies the checksums. In case a bad checksum
28 * is found or the extent cannot be read, good data will be written back if
31 * Future enhancements:
32 * - In case an unrepairable extent is encountered, track which files are
33 * affected and report them
34 * - track and record media errors, throw out bad devices
35 * - add a mode to also read unallocated space
42 * the following three values only influence the performance.
43 * The last one configures the number of parallel and outstanding I/O
44 * operations. The first two values configure an upper limit for the number
45 * of (dynamically allocated) pages that are added to a bio.
47 #define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */
48 #define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */
49 #define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */
52 * the following value times PAGE_SIZE needs to be large enough to match the
53 * largest node/leaf/sector size that shall be supported.
54 * Values larger than BTRFS_STRIPE_LEN are not supported.
56 #define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */
58 struct scrub_recover {
60 struct btrfs_bio *bbio;
65 struct scrub_block *sblock;
67 struct btrfs_device *dev;
68 struct list_head list;
69 u64 flags; /* extent flags */
73 u64 physical_for_dev_replace;
78 u8 csum[BTRFS_CSUM_SIZE];
80 struct scrub_recover *recover;
85 struct scrub_ctx *sctx;
86 struct btrfs_device *dev;
91 #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO
92 struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO];
94 struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO];
98 struct btrfs_work work;
102 struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK];
104 atomic_t outstanding_pages;
105 refcount_t refs; /* free mem on transition to zero */
106 struct scrub_ctx *sctx;
107 struct scrub_parity *sparity;
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 */
114 /* The following is for the data used to check parity */
115 /* It is for the data with checksum */
116 unsigned int data_corrected:1;
118 struct btrfs_work work;
121 /* Used for the chunks with parity stripe such RAID5/6 */
122 struct scrub_parity {
123 struct scrub_ctx *sctx;
125 struct btrfs_device *scrub_dev;
137 struct list_head spages;
139 /* Work of parity check and repair */
140 struct btrfs_work work;
142 /* Mark the parity blocks which have data */
143 unsigned long *dbitmap;
146 * Mark the parity blocks which have data, but errors happen when
147 * read data or check data
149 unsigned long *ebitmap;
151 unsigned long bitmap[];
155 struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX];
156 struct btrfs_fs_info *fs_info;
159 atomic_t bios_in_flight;
160 atomic_t workers_pending;
161 spinlock_t list_lock;
162 wait_queue_head_t list_wait;
163 struct list_head csum_list;
166 int pages_per_rd_bio;
171 struct scrub_bio *wr_curr_bio;
172 struct mutex wr_lock;
173 int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */
174 struct btrfs_device *wr_tgtdev;
175 bool flush_all_writes;
180 struct btrfs_scrub_progress stat;
181 spinlock_t stat_lock;
184 * Use a ref counter to avoid use-after-free issues. Scrub workers
185 * decrement bios_in_flight and workers_pending and then do a wakeup
186 * on the list_wait wait queue. We must ensure the main scrub task
187 * doesn't free the scrub context before or while the workers are
188 * doing the wakeup() call.
193 struct scrub_warning {
194 struct btrfs_path *path;
195 u64 extent_item_size;
199 struct btrfs_device *dev;
202 struct full_stripe_lock {
209 static void scrub_pending_bio_inc(struct scrub_ctx *sctx);
210 static void scrub_pending_bio_dec(struct scrub_ctx *sctx);
211 static int scrub_handle_errored_block(struct scrub_block *sblock_to_check);
212 static int scrub_setup_recheck_block(struct scrub_block *original_sblock,
213 struct scrub_block *sblocks_for_recheck);
214 static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
215 struct scrub_block *sblock,
216 int retry_failed_mirror);
217 static void scrub_recheck_block_checksum(struct scrub_block *sblock);
218 static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
219 struct scrub_block *sblock_good);
220 static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
221 struct scrub_block *sblock_good,
222 int page_num, int force_write);
223 static void scrub_write_block_to_dev_replace(struct scrub_block *sblock);
224 static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
226 static int scrub_checksum_data(struct scrub_block *sblock);
227 static int scrub_checksum_tree_block(struct scrub_block *sblock);
228 static int scrub_checksum_super(struct scrub_block *sblock);
229 static void scrub_block_get(struct scrub_block *sblock);
230 static void scrub_block_put(struct scrub_block *sblock);
231 static void scrub_page_get(struct scrub_page *spage);
232 static void scrub_page_put(struct scrub_page *spage);
233 static void scrub_parity_get(struct scrub_parity *sparity);
234 static void scrub_parity_put(struct scrub_parity *sparity);
235 static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
236 struct scrub_page *spage);
237 static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u32 len,
238 u64 physical, struct btrfs_device *dev, u64 flags,
239 u64 gen, int mirror_num, u8 *csum,
240 u64 physical_for_dev_replace);
241 static void scrub_bio_end_io(struct bio *bio);
242 static void scrub_bio_end_io_worker(struct btrfs_work *work);
243 static void scrub_block_complete(struct scrub_block *sblock);
244 static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
245 u64 extent_logical, u32 extent_len,
246 u64 *extent_physical,
247 struct btrfs_device **extent_dev,
248 int *extent_mirror_num);
249 static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
250 struct scrub_page *spage);
251 static void scrub_wr_submit(struct scrub_ctx *sctx);
252 static void scrub_wr_bio_end_io(struct bio *bio);
253 static void scrub_wr_bio_end_io_worker(struct btrfs_work *work);
254 static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info);
255 static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info);
256 static void scrub_put_ctx(struct scrub_ctx *sctx);
258 static inline int scrub_is_page_on_raid56(struct scrub_page *spage)
260 return spage->recover &&
261 (spage->recover->bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK);
264 static void scrub_pending_bio_inc(struct scrub_ctx *sctx)
266 refcount_inc(&sctx->refs);
267 atomic_inc(&sctx->bios_in_flight);
270 static void scrub_pending_bio_dec(struct scrub_ctx *sctx)
272 atomic_dec(&sctx->bios_in_flight);
273 wake_up(&sctx->list_wait);
277 static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
279 while (atomic_read(&fs_info->scrub_pause_req)) {
280 mutex_unlock(&fs_info->scrub_lock);
281 wait_event(fs_info->scrub_pause_wait,
282 atomic_read(&fs_info->scrub_pause_req) == 0);
283 mutex_lock(&fs_info->scrub_lock);
287 static void scrub_pause_on(struct btrfs_fs_info *fs_info)
289 atomic_inc(&fs_info->scrubs_paused);
290 wake_up(&fs_info->scrub_pause_wait);
293 static void scrub_pause_off(struct btrfs_fs_info *fs_info)
295 mutex_lock(&fs_info->scrub_lock);
296 __scrub_blocked_if_needed(fs_info);
297 atomic_dec(&fs_info->scrubs_paused);
298 mutex_unlock(&fs_info->scrub_lock);
300 wake_up(&fs_info->scrub_pause_wait);
303 static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
305 scrub_pause_on(fs_info);
306 scrub_pause_off(fs_info);
310 * Insert new full stripe lock into full stripe locks tree
312 * Return pointer to existing or newly inserted full_stripe_lock structure if
313 * everything works well.
314 * Return ERR_PTR(-ENOMEM) if we failed to allocate memory
316 * NOTE: caller must hold full_stripe_locks_root->lock before calling this
319 static struct full_stripe_lock *insert_full_stripe_lock(
320 struct btrfs_full_stripe_locks_tree *locks_root,
324 struct rb_node *parent = NULL;
325 struct full_stripe_lock *entry;
326 struct full_stripe_lock *ret;
328 lockdep_assert_held(&locks_root->lock);
330 p = &locks_root->root.rb_node;
333 entry = rb_entry(parent, struct full_stripe_lock, node);
334 if (fstripe_logical < entry->logical) {
336 } else if (fstripe_logical > entry->logical) {
347 ret = kmalloc(sizeof(*ret), GFP_KERNEL);
349 return ERR_PTR(-ENOMEM);
350 ret->logical = fstripe_logical;
352 mutex_init(&ret->mutex);
354 rb_link_node(&ret->node, parent, p);
355 rb_insert_color(&ret->node, &locks_root->root);
360 * Search for a full stripe lock of a block group
362 * Return pointer to existing full stripe lock if found
363 * Return NULL if not found
365 static struct full_stripe_lock *search_full_stripe_lock(
366 struct btrfs_full_stripe_locks_tree *locks_root,
369 struct rb_node *node;
370 struct full_stripe_lock *entry;
372 lockdep_assert_held(&locks_root->lock);
374 node = locks_root->root.rb_node;
376 entry = rb_entry(node, struct full_stripe_lock, node);
377 if (fstripe_logical < entry->logical)
378 node = node->rb_left;
379 else if (fstripe_logical > entry->logical)
380 node = node->rb_right;
388 * Helper to get full stripe logical from a normal bytenr.
390 * Caller must ensure @cache is a RAID56 block group.
392 static u64 get_full_stripe_logical(struct btrfs_block_group *cache, u64 bytenr)
397 * Due to chunk item size limit, full stripe length should not be
398 * larger than U32_MAX. Just a sanity check here.
400 WARN_ON_ONCE(cache->full_stripe_len >= U32_MAX);
403 * round_down() can only handle power of 2, while RAID56 full
404 * stripe length can be 64KiB * n, so we need to manually round down.
406 ret = div64_u64(bytenr - cache->start, cache->full_stripe_len) *
407 cache->full_stripe_len + cache->start;
412 * Lock a full stripe to avoid concurrency of recovery and read
414 * It's only used for profiles with parities (RAID5/6), for other profiles it
417 * Return 0 if we locked full stripe covering @bytenr, with a mutex held.
418 * So caller must call unlock_full_stripe() at the same context.
420 * Return <0 if encounters error.
422 static int lock_full_stripe(struct btrfs_fs_info *fs_info, u64 bytenr,
425 struct btrfs_block_group *bg_cache;
426 struct btrfs_full_stripe_locks_tree *locks_root;
427 struct full_stripe_lock *existing;
432 bg_cache = btrfs_lookup_block_group(fs_info, bytenr);
438 /* Profiles not based on parity don't need full stripe lock */
439 if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_RAID56_MASK))
441 locks_root = &bg_cache->full_stripe_locks_root;
443 fstripe_start = get_full_stripe_logical(bg_cache, bytenr);
445 /* Now insert the full stripe lock */
446 mutex_lock(&locks_root->lock);
447 existing = insert_full_stripe_lock(locks_root, fstripe_start);
448 mutex_unlock(&locks_root->lock);
449 if (IS_ERR(existing)) {
450 ret = PTR_ERR(existing);
453 mutex_lock(&existing->mutex);
456 btrfs_put_block_group(bg_cache);
461 * Unlock a full stripe.
463 * NOTE: Caller must ensure it's the same context calling corresponding
464 * lock_full_stripe().
466 * Return 0 if we unlock full stripe without problem.
467 * Return <0 for error
469 static int unlock_full_stripe(struct btrfs_fs_info *fs_info, u64 bytenr,
472 struct btrfs_block_group *bg_cache;
473 struct btrfs_full_stripe_locks_tree *locks_root;
474 struct full_stripe_lock *fstripe_lock;
479 /* If we didn't acquire full stripe lock, no need to continue */
483 bg_cache = btrfs_lookup_block_group(fs_info, bytenr);
488 if (!(bg_cache->flags & BTRFS_BLOCK_GROUP_RAID56_MASK))
491 locks_root = &bg_cache->full_stripe_locks_root;
492 fstripe_start = get_full_stripe_logical(bg_cache, bytenr);
494 mutex_lock(&locks_root->lock);
495 fstripe_lock = search_full_stripe_lock(locks_root, fstripe_start);
496 /* Unpaired unlock_full_stripe() detected */
500 mutex_unlock(&locks_root->lock);
504 if (fstripe_lock->refs == 0) {
506 btrfs_warn(fs_info, "full stripe lock at %llu refcount underflow",
507 fstripe_lock->logical);
509 fstripe_lock->refs--;
512 if (fstripe_lock->refs == 0) {
513 rb_erase(&fstripe_lock->node, &locks_root->root);
516 mutex_unlock(&locks_root->lock);
518 mutex_unlock(&fstripe_lock->mutex);
522 btrfs_put_block_group(bg_cache);
526 static void scrub_free_csums(struct scrub_ctx *sctx)
528 while (!list_empty(&sctx->csum_list)) {
529 struct btrfs_ordered_sum *sum;
530 sum = list_first_entry(&sctx->csum_list,
531 struct btrfs_ordered_sum, list);
532 list_del(&sum->list);
537 static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx)
544 /* this can happen when scrub is cancelled */
545 if (sctx->curr != -1) {
546 struct scrub_bio *sbio = sctx->bios[sctx->curr];
548 for (i = 0; i < sbio->page_count; i++) {
549 WARN_ON(!sbio->pagev[i]->page);
550 scrub_block_put(sbio->pagev[i]->sblock);
555 for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
556 struct scrub_bio *sbio = sctx->bios[i];
563 kfree(sctx->wr_curr_bio);
564 scrub_free_csums(sctx);
568 static void scrub_put_ctx(struct scrub_ctx *sctx)
570 if (refcount_dec_and_test(&sctx->refs))
571 scrub_free_ctx(sctx);
574 static noinline_for_stack struct scrub_ctx *scrub_setup_ctx(
575 struct btrfs_fs_info *fs_info, int is_dev_replace)
577 struct scrub_ctx *sctx;
580 sctx = kzalloc(sizeof(*sctx), GFP_KERNEL);
583 refcount_set(&sctx->refs, 1);
584 sctx->is_dev_replace = is_dev_replace;
585 sctx->pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO;
587 sctx->fs_info = fs_info;
588 INIT_LIST_HEAD(&sctx->csum_list);
589 for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
590 struct scrub_bio *sbio;
592 sbio = kzalloc(sizeof(*sbio), GFP_KERNEL);
595 sctx->bios[i] = sbio;
599 sbio->page_count = 0;
600 btrfs_init_work(&sbio->work, scrub_bio_end_io_worker, NULL,
603 if (i != SCRUB_BIOS_PER_SCTX - 1)
604 sctx->bios[i]->next_free = i + 1;
606 sctx->bios[i]->next_free = -1;
608 sctx->first_free = 0;
609 atomic_set(&sctx->bios_in_flight, 0);
610 atomic_set(&sctx->workers_pending, 0);
611 atomic_set(&sctx->cancel_req, 0);
613 spin_lock_init(&sctx->list_lock);
614 spin_lock_init(&sctx->stat_lock);
615 init_waitqueue_head(&sctx->list_wait);
617 WARN_ON(sctx->wr_curr_bio != NULL);
618 mutex_init(&sctx->wr_lock);
619 sctx->wr_curr_bio = NULL;
620 if (is_dev_replace) {
621 WARN_ON(!fs_info->dev_replace.tgtdev);
622 sctx->pages_per_wr_bio = SCRUB_PAGES_PER_WR_BIO;
623 sctx->wr_tgtdev = fs_info->dev_replace.tgtdev;
624 sctx->flush_all_writes = false;
630 scrub_free_ctx(sctx);
631 return ERR_PTR(-ENOMEM);
634 static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root,
642 struct extent_buffer *eb;
643 struct btrfs_inode_item *inode_item;
644 struct scrub_warning *swarn = warn_ctx;
645 struct btrfs_fs_info *fs_info = swarn->dev->fs_info;
646 struct inode_fs_paths *ipath = NULL;
647 struct btrfs_root *local_root;
648 struct btrfs_key key;
650 local_root = btrfs_get_fs_root(fs_info, root, true);
651 if (IS_ERR(local_root)) {
652 ret = PTR_ERR(local_root);
657 * this makes the path point to (inum INODE_ITEM ioff)
660 key.type = BTRFS_INODE_ITEM_KEY;
663 ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0);
665 btrfs_put_root(local_root);
666 btrfs_release_path(swarn->path);
670 eb = swarn->path->nodes[0];
671 inode_item = btrfs_item_ptr(eb, swarn->path->slots[0],
672 struct btrfs_inode_item);
673 isize = btrfs_inode_size(eb, inode_item);
674 nlink = btrfs_inode_nlink(eb, inode_item);
675 btrfs_release_path(swarn->path);
678 * init_path might indirectly call vmalloc, or use GFP_KERNEL. Scrub
679 * uses GFP_NOFS in this context, so we keep it consistent but it does
680 * not seem to be strictly necessary.
682 nofs_flag = memalloc_nofs_save();
683 ipath = init_ipath(4096, local_root, swarn->path);
684 memalloc_nofs_restore(nofs_flag);
686 btrfs_put_root(local_root);
687 ret = PTR_ERR(ipath);
691 ret = paths_from_inode(inum, ipath);
697 * we deliberately ignore the bit ipath might have been too small to
698 * hold all of the paths here
700 for (i = 0; i < ipath->fspath->elem_cnt; ++i)
701 btrfs_warn_in_rcu(fs_info,
702 "%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu, length %llu, links %u (path: %s)",
703 swarn->errstr, swarn->logical,
704 rcu_str_deref(swarn->dev->name),
707 min(isize - offset, (u64)PAGE_SIZE), nlink,
708 (char *)(unsigned long)ipath->fspath->val[i]);
710 btrfs_put_root(local_root);
715 btrfs_warn_in_rcu(fs_info,
716 "%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu: path resolving failed with ret=%d",
717 swarn->errstr, swarn->logical,
718 rcu_str_deref(swarn->dev->name),
720 root, inum, offset, ret);
726 static void scrub_print_warning(const char *errstr, struct scrub_block *sblock)
728 struct btrfs_device *dev;
729 struct btrfs_fs_info *fs_info;
730 struct btrfs_path *path;
731 struct btrfs_key found_key;
732 struct extent_buffer *eb;
733 struct btrfs_extent_item *ei;
734 struct scrub_warning swarn;
735 unsigned long ptr = 0;
743 WARN_ON(sblock->page_count < 1);
744 dev = sblock->pagev[0]->dev;
745 fs_info = sblock->sctx->fs_info;
747 path = btrfs_alloc_path();
751 swarn.physical = sblock->pagev[0]->physical;
752 swarn.logical = sblock->pagev[0]->logical;
753 swarn.errstr = errstr;
756 ret = extent_from_logical(fs_info, swarn.logical, path, &found_key,
761 extent_item_pos = swarn.logical - found_key.objectid;
762 swarn.extent_item_size = found_key.offset;
765 ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item);
766 item_size = btrfs_item_size_nr(eb, path->slots[0]);
768 if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
770 ret = tree_backref_for_extent(&ptr, eb, &found_key, ei,
771 item_size, &ref_root,
773 btrfs_warn_in_rcu(fs_info,
774 "%s at logical %llu on dev %s, physical %llu: metadata %s (level %d) in tree %llu",
775 errstr, swarn.logical,
776 rcu_str_deref(dev->name),
778 ref_level ? "node" : "leaf",
779 ret < 0 ? -1 : ref_level,
780 ret < 0 ? -1 : ref_root);
782 btrfs_release_path(path);
784 btrfs_release_path(path);
787 iterate_extent_inodes(fs_info, found_key.objectid,
789 scrub_print_warning_inode, &swarn, false);
793 btrfs_free_path(path);
796 static inline void scrub_get_recover(struct scrub_recover *recover)
798 refcount_inc(&recover->refs);
801 static inline void scrub_put_recover(struct btrfs_fs_info *fs_info,
802 struct scrub_recover *recover)
804 if (refcount_dec_and_test(&recover->refs)) {
805 btrfs_bio_counter_dec(fs_info);
806 btrfs_put_bbio(recover->bbio);
812 * scrub_handle_errored_block gets called when either verification of the
813 * pages failed or the bio failed to read, e.g. with EIO. In the latter
814 * case, this function handles all pages in the bio, even though only one
816 * The goal of this function is to repair the errored block by using the
817 * contents of one of the mirrors.
819 static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
821 struct scrub_ctx *sctx = sblock_to_check->sctx;
822 struct btrfs_device *dev;
823 struct btrfs_fs_info *fs_info;
825 unsigned int failed_mirror_index;
826 unsigned int is_metadata;
827 unsigned int have_csum;
828 struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */
829 struct scrub_block *sblock_bad;
834 bool full_stripe_locked;
835 unsigned int nofs_flag;
836 static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,
837 DEFAULT_RATELIMIT_BURST);
839 BUG_ON(sblock_to_check->page_count < 1);
840 fs_info = sctx->fs_info;
841 if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) {
843 * if we find an error in a super block, we just report it.
844 * They will get written with the next transaction commit
847 spin_lock(&sctx->stat_lock);
848 ++sctx->stat.super_errors;
849 spin_unlock(&sctx->stat_lock);
852 logical = sblock_to_check->pagev[0]->logical;
853 BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1);
854 failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1;
855 is_metadata = !(sblock_to_check->pagev[0]->flags &
856 BTRFS_EXTENT_FLAG_DATA);
857 have_csum = sblock_to_check->pagev[0]->have_csum;
858 dev = sblock_to_check->pagev[0]->dev;
860 if (btrfs_is_zoned(fs_info) && !sctx->is_dev_replace)
861 return btrfs_repair_one_zone(fs_info, logical);
864 * We must use GFP_NOFS because the scrub task might be waiting for a
865 * worker task executing this function and in turn a transaction commit
866 * might be waiting the scrub task to pause (which needs to wait for all
867 * the worker tasks to complete before pausing).
868 * We do allocations in the workers through insert_full_stripe_lock()
869 * and scrub_add_page_to_wr_bio(), which happens down the call chain of
872 nofs_flag = memalloc_nofs_save();
874 * For RAID5/6, race can happen for a different device scrub thread.
875 * For data corruption, Parity and Data threads will both try
876 * to recovery the data.
877 * Race can lead to doubly added csum error, or even unrecoverable
880 ret = lock_full_stripe(fs_info, logical, &full_stripe_locked);
882 memalloc_nofs_restore(nofs_flag);
883 spin_lock(&sctx->stat_lock);
885 sctx->stat.malloc_errors++;
886 sctx->stat.read_errors++;
887 sctx->stat.uncorrectable_errors++;
888 spin_unlock(&sctx->stat_lock);
893 * read all mirrors one after the other. This includes to
894 * re-read the extent or metadata block that failed (that was
895 * the cause that this fixup code is called) another time,
896 * page by page this time in order to know which pages
897 * caused I/O errors and which ones are good (for all mirrors).
898 * It is the goal to handle the situation when more than one
899 * mirror contains I/O errors, but the errors do not
900 * overlap, i.e. the data can be repaired by selecting the
901 * pages from those mirrors without I/O error on the
902 * particular pages. One example (with blocks >= 2 * PAGE_SIZE)
903 * would be that mirror #1 has an I/O error on the first page,
904 * the second page is good, and mirror #2 has an I/O error on
905 * the second page, but the first page is good.
906 * Then the first page of the first mirror can be repaired by
907 * taking the first page of the second mirror, and the
908 * second page of the second mirror can be repaired by
909 * copying the contents of the 2nd page of the 1st mirror.
910 * One more note: if the pages of one mirror contain I/O
911 * errors, the checksum cannot be verified. In order to get
912 * the best data for repairing, the first attempt is to find
913 * a mirror without I/O errors and with a validated checksum.
914 * Only if this is not possible, the pages are picked from
915 * mirrors with I/O errors without considering the checksum.
916 * If the latter is the case, at the end, the checksum of the
917 * repaired area is verified in order to correctly maintain
921 sblocks_for_recheck = kcalloc(BTRFS_MAX_MIRRORS,
922 sizeof(*sblocks_for_recheck), GFP_KERNEL);
923 if (!sblocks_for_recheck) {
924 spin_lock(&sctx->stat_lock);
925 sctx->stat.malloc_errors++;
926 sctx->stat.read_errors++;
927 sctx->stat.uncorrectable_errors++;
928 spin_unlock(&sctx->stat_lock);
929 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
933 /* setup the context, map the logical blocks and alloc the pages */
934 ret = scrub_setup_recheck_block(sblock_to_check, sblocks_for_recheck);
936 spin_lock(&sctx->stat_lock);
937 sctx->stat.read_errors++;
938 sctx->stat.uncorrectable_errors++;
939 spin_unlock(&sctx->stat_lock);
940 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
943 BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS);
944 sblock_bad = sblocks_for_recheck + failed_mirror_index;
946 /* build and submit the bios for the failed mirror, check checksums */
947 scrub_recheck_block(fs_info, sblock_bad, 1);
949 if (!sblock_bad->header_error && !sblock_bad->checksum_error &&
950 sblock_bad->no_io_error_seen) {
952 * the error disappeared after reading page by page, or
953 * the area was part of a huge bio and other parts of the
954 * bio caused I/O errors, or the block layer merged several
955 * read requests into one and the error is caused by a
956 * different bio (usually one of the two latter cases is
959 spin_lock(&sctx->stat_lock);
960 sctx->stat.unverified_errors++;
961 sblock_to_check->data_corrected = 1;
962 spin_unlock(&sctx->stat_lock);
964 if (sctx->is_dev_replace)
965 scrub_write_block_to_dev_replace(sblock_bad);
969 if (!sblock_bad->no_io_error_seen) {
970 spin_lock(&sctx->stat_lock);
971 sctx->stat.read_errors++;
972 spin_unlock(&sctx->stat_lock);
973 if (__ratelimit(&rs))
974 scrub_print_warning("i/o error", sblock_to_check);
975 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
976 } else if (sblock_bad->checksum_error) {
977 spin_lock(&sctx->stat_lock);
978 sctx->stat.csum_errors++;
979 spin_unlock(&sctx->stat_lock);
980 if (__ratelimit(&rs))
981 scrub_print_warning("checksum error", sblock_to_check);
982 btrfs_dev_stat_inc_and_print(dev,
983 BTRFS_DEV_STAT_CORRUPTION_ERRS);
984 } else if (sblock_bad->header_error) {
985 spin_lock(&sctx->stat_lock);
986 sctx->stat.verify_errors++;
987 spin_unlock(&sctx->stat_lock);
988 if (__ratelimit(&rs))
989 scrub_print_warning("checksum/header error",
991 if (sblock_bad->generation_error)
992 btrfs_dev_stat_inc_and_print(dev,
993 BTRFS_DEV_STAT_GENERATION_ERRS);
995 btrfs_dev_stat_inc_and_print(dev,
996 BTRFS_DEV_STAT_CORRUPTION_ERRS);
999 if (sctx->readonly) {
1000 ASSERT(!sctx->is_dev_replace);
1005 * now build and submit the bios for the other mirrors, check
1007 * First try to pick the mirror which is completely without I/O
1008 * errors and also does not have a checksum error.
1009 * If one is found, and if a checksum is present, the full block
1010 * that is known to contain an error is rewritten. Afterwards
1011 * the block is known to be corrected.
1012 * If a mirror is found which is completely correct, and no
1013 * checksum is present, only those pages are rewritten that had
1014 * an I/O error in the block to be repaired, since it cannot be
1015 * determined, which copy of the other pages is better (and it
1016 * could happen otherwise that a correct page would be
1017 * overwritten by a bad one).
1019 for (mirror_index = 0; ;mirror_index++) {
1020 struct scrub_block *sblock_other;
1022 if (mirror_index == failed_mirror_index)
1025 /* raid56's mirror can be more than BTRFS_MAX_MIRRORS */
1026 if (!scrub_is_page_on_raid56(sblock_bad->pagev[0])) {
1027 if (mirror_index >= BTRFS_MAX_MIRRORS)
1029 if (!sblocks_for_recheck[mirror_index].page_count)
1032 sblock_other = sblocks_for_recheck + mirror_index;
1034 struct scrub_recover *r = sblock_bad->pagev[0]->recover;
1035 int max_allowed = r->bbio->num_stripes -
1036 r->bbio->num_tgtdevs;
1038 if (mirror_index >= max_allowed)
1040 if (!sblocks_for_recheck[1].page_count)
1043 ASSERT(failed_mirror_index == 0);
1044 sblock_other = sblocks_for_recheck + 1;
1045 sblock_other->pagev[0]->mirror_num = 1 + mirror_index;
1048 /* build and submit the bios, check checksums */
1049 scrub_recheck_block(fs_info, sblock_other, 0);
1051 if (!sblock_other->header_error &&
1052 !sblock_other->checksum_error &&
1053 sblock_other->no_io_error_seen) {
1054 if (sctx->is_dev_replace) {
1055 scrub_write_block_to_dev_replace(sblock_other);
1056 goto corrected_error;
1058 ret = scrub_repair_block_from_good_copy(
1059 sblock_bad, sblock_other);
1061 goto corrected_error;
1066 if (sblock_bad->no_io_error_seen && !sctx->is_dev_replace)
1067 goto did_not_correct_error;
1070 * In case of I/O errors in the area that is supposed to be
1071 * repaired, continue by picking good copies of those pages.
1072 * Select the good pages from mirrors to rewrite bad pages from
1073 * the area to fix. Afterwards verify the checksum of the block
1074 * that is supposed to be repaired. This verification step is
1075 * only done for the purpose of statistic counting and for the
1076 * final scrub report, whether errors remain.
1077 * A perfect algorithm could make use of the checksum and try
1078 * all possible combinations of pages from the different mirrors
1079 * until the checksum verification succeeds. For example, when
1080 * the 2nd page of mirror #1 faces I/O errors, and the 2nd page
1081 * of mirror #2 is readable but the final checksum test fails,
1082 * then the 2nd page of mirror #3 could be tried, whether now
1083 * the final checksum succeeds. But this would be a rare
1084 * exception and is therefore not implemented. At least it is
1085 * avoided that the good copy is overwritten.
1086 * A more useful improvement would be to pick the sectors
1087 * without I/O error based on sector sizes (512 bytes on legacy
1088 * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one
1089 * mirror could be repaired by taking 512 byte of a different
1090 * mirror, even if other 512 byte sectors in the same PAGE_SIZE
1091 * area are unreadable.
1094 for (page_num = 0; page_num < sblock_bad->page_count;
1096 struct scrub_page *spage_bad = sblock_bad->pagev[page_num];
1097 struct scrub_block *sblock_other = NULL;
1099 /* skip no-io-error page in scrub */
1100 if (!spage_bad->io_error && !sctx->is_dev_replace)
1103 if (scrub_is_page_on_raid56(sblock_bad->pagev[0])) {
1105 * In case of dev replace, if raid56 rebuild process
1106 * didn't work out correct data, then copy the content
1107 * in sblock_bad to make sure target device is identical
1108 * to source device, instead of writing garbage data in
1109 * sblock_for_recheck array to target device.
1111 sblock_other = NULL;
1112 } else if (spage_bad->io_error) {
1113 /* try to find no-io-error page in mirrors */
1114 for (mirror_index = 0;
1115 mirror_index < BTRFS_MAX_MIRRORS &&
1116 sblocks_for_recheck[mirror_index].page_count > 0;
1118 if (!sblocks_for_recheck[mirror_index].
1119 pagev[page_num]->io_error) {
1120 sblock_other = sblocks_for_recheck +
1129 if (sctx->is_dev_replace) {
1131 * did not find a mirror to fetch the page
1132 * from. scrub_write_page_to_dev_replace()
1133 * handles this case (page->io_error), by
1134 * filling the block with zeros before
1135 * submitting the write request
1138 sblock_other = sblock_bad;
1140 if (scrub_write_page_to_dev_replace(sblock_other,
1143 &fs_info->dev_replace.num_write_errors);
1146 } else if (sblock_other) {
1147 ret = scrub_repair_page_from_good_copy(sblock_bad,
1151 spage_bad->io_error = 0;
1157 if (success && !sctx->is_dev_replace) {
1158 if (is_metadata || have_csum) {
1160 * need to verify the checksum now that all
1161 * sectors on disk are repaired (the write
1162 * request for data to be repaired is on its way).
1163 * Just be lazy and use scrub_recheck_block()
1164 * which re-reads the data before the checksum
1165 * is verified, but most likely the data comes out
1166 * of the page cache.
1168 scrub_recheck_block(fs_info, sblock_bad, 1);
1169 if (!sblock_bad->header_error &&
1170 !sblock_bad->checksum_error &&
1171 sblock_bad->no_io_error_seen)
1172 goto corrected_error;
1174 goto did_not_correct_error;
1177 spin_lock(&sctx->stat_lock);
1178 sctx->stat.corrected_errors++;
1179 sblock_to_check->data_corrected = 1;
1180 spin_unlock(&sctx->stat_lock);
1181 btrfs_err_rl_in_rcu(fs_info,
1182 "fixed up error at logical %llu on dev %s",
1183 logical, rcu_str_deref(dev->name));
1186 did_not_correct_error:
1187 spin_lock(&sctx->stat_lock);
1188 sctx->stat.uncorrectable_errors++;
1189 spin_unlock(&sctx->stat_lock);
1190 btrfs_err_rl_in_rcu(fs_info,
1191 "unable to fixup (regular) error at logical %llu on dev %s",
1192 logical, rcu_str_deref(dev->name));
1196 if (sblocks_for_recheck) {
1197 for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS;
1199 struct scrub_block *sblock = sblocks_for_recheck +
1201 struct scrub_recover *recover;
1204 for (page_index = 0; page_index < sblock->page_count;
1206 sblock->pagev[page_index]->sblock = NULL;
1207 recover = sblock->pagev[page_index]->recover;
1209 scrub_put_recover(fs_info, recover);
1210 sblock->pagev[page_index]->recover =
1213 scrub_page_put(sblock->pagev[page_index]);
1216 kfree(sblocks_for_recheck);
1219 ret = unlock_full_stripe(fs_info, logical, full_stripe_locked);
1220 memalloc_nofs_restore(nofs_flag);
1226 static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio)
1228 if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID5)
1230 else if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID6)
1233 return (int)bbio->num_stripes;
1236 static inline void scrub_stripe_index_and_offset(u64 logical, u64 map_type,
1239 int nstripes, int mirror,
1245 if (map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
1247 for (i = 0; i < nstripes; i++) {
1248 if (raid_map[i] == RAID6_Q_STRIPE ||
1249 raid_map[i] == RAID5_P_STRIPE)
1252 if (logical >= raid_map[i] &&
1253 logical < raid_map[i] + mapped_length)
1258 *stripe_offset = logical - raid_map[i];
1260 /* The other RAID type */
1261 *stripe_index = mirror;
1266 static int scrub_setup_recheck_block(struct scrub_block *original_sblock,
1267 struct scrub_block *sblocks_for_recheck)
1269 struct scrub_ctx *sctx = original_sblock->sctx;
1270 struct btrfs_fs_info *fs_info = sctx->fs_info;
1271 u64 length = original_sblock->page_count * PAGE_SIZE;
1272 u64 logical = original_sblock->pagev[0]->logical;
1273 u64 generation = original_sblock->pagev[0]->generation;
1274 u64 flags = original_sblock->pagev[0]->flags;
1275 u64 have_csum = original_sblock->pagev[0]->have_csum;
1276 struct scrub_recover *recover;
1277 struct btrfs_bio *bbio;
1288 * note: the two members refs and outstanding_pages
1289 * are not used (and not set) in the blocks that are used for
1290 * the recheck procedure
1293 while (length > 0) {
1294 sublen = min_t(u64, length, PAGE_SIZE);
1295 mapped_length = sublen;
1299 * with a length of PAGE_SIZE, each returned stripe
1300 * represents one mirror
1302 btrfs_bio_counter_inc_blocked(fs_info);
1303 ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS,
1304 logical, &mapped_length, &bbio);
1305 if (ret || !bbio || mapped_length < sublen) {
1306 btrfs_put_bbio(bbio);
1307 btrfs_bio_counter_dec(fs_info);
1311 recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS);
1313 btrfs_put_bbio(bbio);
1314 btrfs_bio_counter_dec(fs_info);
1318 refcount_set(&recover->refs, 1);
1319 recover->bbio = bbio;
1320 recover->map_length = mapped_length;
1322 BUG_ON(page_index >= SCRUB_MAX_PAGES_PER_BLOCK);
1324 nmirrors = min(scrub_nr_raid_mirrors(bbio), BTRFS_MAX_MIRRORS);
1326 for (mirror_index = 0; mirror_index < nmirrors;
1328 struct scrub_block *sblock;
1329 struct scrub_page *spage;
1331 sblock = sblocks_for_recheck + mirror_index;
1332 sblock->sctx = sctx;
1334 spage = kzalloc(sizeof(*spage), GFP_NOFS);
1337 spin_lock(&sctx->stat_lock);
1338 sctx->stat.malloc_errors++;
1339 spin_unlock(&sctx->stat_lock);
1340 scrub_put_recover(fs_info, recover);
1343 scrub_page_get(spage);
1344 sblock->pagev[page_index] = spage;
1345 spage->sblock = sblock;
1346 spage->flags = flags;
1347 spage->generation = generation;
1348 spage->logical = logical;
1349 spage->have_csum = have_csum;
1352 original_sblock->pagev[0]->csum,
1353 sctx->fs_info->csum_size);
1355 scrub_stripe_index_and_offset(logical,
1364 spage->physical = bbio->stripes[stripe_index].physical +
1366 spage->dev = bbio->stripes[stripe_index].dev;
1368 BUG_ON(page_index >= original_sblock->page_count);
1369 spage->physical_for_dev_replace =
1370 original_sblock->pagev[page_index]->
1371 physical_for_dev_replace;
1372 /* for missing devices, dev->bdev is NULL */
1373 spage->mirror_num = mirror_index + 1;
1374 sblock->page_count++;
1375 spage->page = alloc_page(GFP_NOFS);
1379 scrub_get_recover(recover);
1380 spage->recover = recover;
1382 scrub_put_recover(fs_info, recover);
1391 static void scrub_bio_wait_endio(struct bio *bio)
1393 complete(bio->bi_private);
1396 static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info,
1398 struct scrub_page *spage)
1400 DECLARE_COMPLETION_ONSTACK(done);
1404 bio->bi_iter.bi_sector = spage->logical >> 9;
1405 bio->bi_private = &done;
1406 bio->bi_end_io = scrub_bio_wait_endio;
1408 mirror_num = spage->sblock->pagev[0]->mirror_num;
1409 ret = raid56_parity_recover(fs_info, bio, spage->recover->bbio,
1410 spage->recover->map_length,
1415 wait_for_completion_io(&done);
1416 return blk_status_to_errno(bio->bi_status);
1419 static void scrub_recheck_block_on_raid56(struct btrfs_fs_info *fs_info,
1420 struct scrub_block *sblock)
1422 struct scrub_page *first_page = sblock->pagev[0];
1426 /* All pages in sblock belong to the same stripe on the same device. */
1427 ASSERT(first_page->dev);
1428 if (!first_page->dev->bdev)
1431 bio = btrfs_io_bio_alloc(BIO_MAX_PAGES);
1432 bio_set_dev(bio, first_page->dev->bdev);
1434 for (page_num = 0; page_num < sblock->page_count; page_num++) {
1435 struct scrub_page *spage = sblock->pagev[page_num];
1437 WARN_ON(!spage->page);
1438 bio_add_page(bio, spage->page, PAGE_SIZE, 0);
1441 if (scrub_submit_raid56_bio_wait(fs_info, bio, first_page)) {
1448 scrub_recheck_block_checksum(sblock);
1452 for (page_num = 0; page_num < sblock->page_count; page_num++)
1453 sblock->pagev[page_num]->io_error = 1;
1455 sblock->no_io_error_seen = 0;
1459 * this function will check the on disk data for checksum errors, header
1460 * errors and read I/O errors. If any I/O errors happen, the exact pages
1461 * which are errored are marked as being bad. The goal is to enable scrub
1462 * to take those pages that are not errored from all the mirrors so that
1463 * the pages that are errored in the just handled mirror can be repaired.
1465 static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
1466 struct scrub_block *sblock,
1467 int retry_failed_mirror)
1471 sblock->no_io_error_seen = 1;
1473 /* short cut for raid56 */
1474 if (!retry_failed_mirror && scrub_is_page_on_raid56(sblock->pagev[0]))
1475 return scrub_recheck_block_on_raid56(fs_info, sblock);
1477 for (page_num = 0; page_num < sblock->page_count; page_num++) {
1479 struct scrub_page *spage = sblock->pagev[page_num];
1481 if (spage->dev->bdev == NULL) {
1482 spage->io_error = 1;
1483 sblock->no_io_error_seen = 0;
1487 WARN_ON(!spage->page);
1488 bio = btrfs_io_bio_alloc(1);
1489 bio_set_dev(bio, spage->dev->bdev);
1491 bio_add_page(bio, spage->page, PAGE_SIZE, 0);
1492 bio->bi_iter.bi_sector = spage->physical >> 9;
1493 bio->bi_opf = REQ_OP_READ;
1495 if (btrfsic_submit_bio_wait(bio)) {
1496 spage->io_error = 1;
1497 sblock->no_io_error_seen = 0;
1503 if (sblock->no_io_error_seen)
1504 scrub_recheck_block_checksum(sblock);
1507 static inline int scrub_check_fsid(u8 fsid[],
1508 struct scrub_page *spage)
1510 struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices;
1513 ret = memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE);
1517 static void scrub_recheck_block_checksum(struct scrub_block *sblock)
1519 sblock->header_error = 0;
1520 sblock->checksum_error = 0;
1521 sblock->generation_error = 0;
1523 if (sblock->pagev[0]->flags & BTRFS_EXTENT_FLAG_DATA)
1524 scrub_checksum_data(sblock);
1526 scrub_checksum_tree_block(sblock);
1529 static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
1530 struct scrub_block *sblock_good)
1535 for (page_num = 0; page_num < sblock_bad->page_count; page_num++) {
1538 ret_sub = scrub_repair_page_from_good_copy(sblock_bad,
1548 static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
1549 struct scrub_block *sblock_good,
1550 int page_num, int force_write)
1552 struct scrub_page *spage_bad = sblock_bad->pagev[page_num];
1553 struct scrub_page *spage_good = sblock_good->pagev[page_num];
1554 struct btrfs_fs_info *fs_info = sblock_bad->sctx->fs_info;
1556 BUG_ON(spage_bad->page == NULL);
1557 BUG_ON(spage_good->page == NULL);
1558 if (force_write || sblock_bad->header_error ||
1559 sblock_bad->checksum_error || spage_bad->io_error) {
1563 if (!spage_bad->dev->bdev) {
1564 btrfs_warn_rl(fs_info,
1565 "scrub_repair_page_from_good_copy(bdev == NULL) is unexpected");
1569 bio = btrfs_io_bio_alloc(1);
1570 bio_set_dev(bio, spage_bad->dev->bdev);
1571 bio->bi_iter.bi_sector = spage_bad->physical >> 9;
1572 bio->bi_opf = REQ_OP_WRITE;
1574 ret = bio_add_page(bio, spage_good->page, PAGE_SIZE, 0);
1575 if (PAGE_SIZE != ret) {
1580 if (btrfsic_submit_bio_wait(bio)) {
1581 btrfs_dev_stat_inc_and_print(spage_bad->dev,
1582 BTRFS_DEV_STAT_WRITE_ERRS);
1583 atomic64_inc(&fs_info->dev_replace.num_write_errors);
1593 static void scrub_write_block_to_dev_replace(struct scrub_block *sblock)
1595 struct btrfs_fs_info *fs_info = sblock->sctx->fs_info;
1599 * This block is used for the check of the parity on the source device,
1600 * so the data needn't be written into the destination device.
1602 if (sblock->sparity)
1605 for (page_num = 0; page_num < sblock->page_count; page_num++) {
1608 ret = scrub_write_page_to_dev_replace(sblock, page_num);
1610 atomic64_inc(&fs_info->dev_replace.num_write_errors);
1614 static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
1617 struct scrub_page *spage = sblock->pagev[page_num];
1619 BUG_ON(spage->page == NULL);
1620 if (spage->io_error)
1621 clear_page(page_address(spage->page));
1623 return scrub_add_page_to_wr_bio(sblock->sctx, spage);
1626 static int fill_writer_pointer_gap(struct scrub_ctx *sctx, u64 physical)
1631 if (!btrfs_is_zoned(sctx->fs_info))
1634 if (!btrfs_dev_is_sequential(sctx->wr_tgtdev, physical))
1637 if (sctx->write_pointer < physical) {
1638 length = physical - sctx->write_pointer;
1640 ret = btrfs_zoned_issue_zeroout(sctx->wr_tgtdev,
1641 sctx->write_pointer, length);
1643 sctx->write_pointer = physical;
1648 static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
1649 struct scrub_page *spage)
1651 struct scrub_bio *sbio;
1654 mutex_lock(&sctx->wr_lock);
1656 if (!sctx->wr_curr_bio) {
1657 sctx->wr_curr_bio = kzalloc(sizeof(*sctx->wr_curr_bio),
1659 if (!sctx->wr_curr_bio) {
1660 mutex_unlock(&sctx->wr_lock);
1663 sctx->wr_curr_bio->sctx = sctx;
1664 sctx->wr_curr_bio->page_count = 0;
1666 sbio = sctx->wr_curr_bio;
1667 if (sbio->page_count == 0) {
1670 ret = fill_writer_pointer_gap(sctx,
1671 spage->physical_for_dev_replace);
1673 mutex_unlock(&sctx->wr_lock);
1677 sbio->physical = spage->physical_for_dev_replace;
1678 sbio->logical = spage->logical;
1679 sbio->dev = sctx->wr_tgtdev;
1682 bio = btrfs_io_bio_alloc(sctx->pages_per_wr_bio);
1686 bio->bi_private = sbio;
1687 bio->bi_end_io = scrub_wr_bio_end_io;
1688 bio_set_dev(bio, sbio->dev->bdev);
1689 bio->bi_iter.bi_sector = sbio->physical >> 9;
1690 bio->bi_opf = REQ_OP_WRITE;
1692 } else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
1693 spage->physical_for_dev_replace ||
1694 sbio->logical + sbio->page_count * PAGE_SIZE !=
1696 scrub_wr_submit(sctx);
1700 ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
1701 if (ret != PAGE_SIZE) {
1702 if (sbio->page_count < 1) {
1705 mutex_unlock(&sctx->wr_lock);
1708 scrub_wr_submit(sctx);
1712 sbio->pagev[sbio->page_count] = spage;
1713 scrub_page_get(spage);
1715 if (sbio->page_count == sctx->pages_per_wr_bio)
1716 scrub_wr_submit(sctx);
1717 mutex_unlock(&sctx->wr_lock);
1722 static void scrub_wr_submit(struct scrub_ctx *sctx)
1724 struct scrub_bio *sbio;
1726 if (!sctx->wr_curr_bio)
1729 sbio = sctx->wr_curr_bio;
1730 sctx->wr_curr_bio = NULL;
1731 WARN_ON(!sbio->bio->bi_bdev);
1732 scrub_pending_bio_inc(sctx);
1733 /* process all writes in a single worker thread. Then the block layer
1734 * orders the requests before sending them to the driver which
1735 * doubled the write performance on spinning disks when measured
1737 btrfsic_submit_bio(sbio->bio);
1739 if (btrfs_is_zoned(sctx->fs_info))
1740 sctx->write_pointer = sbio->physical + sbio->page_count * PAGE_SIZE;
1743 static void scrub_wr_bio_end_io(struct bio *bio)
1745 struct scrub_bio *sbio = bio->bi_private;
1746 struct btrfs_fs_info *fs_info = sbio->dev->fs_info;
1748 sbio->status = bio->bi_status;
1751 btrfs_init_work(&sbio->work, scrub_wr_bio_end_io_worker, NULL, NULL);
1752 btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work);
1755 static void scrub_wr_bio_end_io_worker(struct btrfs_work *work)
1757 struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
1758 struct scrub_ctx *sctx = sbio->sctx;
1761 WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO);
1763 struct btrfs_dev_replace *dev_replace =
1764 &sbio->sctx->fs_info->dev_replace;
1766 for (i = 0; i < sbio->page_count; i++) {
1767 struct scrub_page *spage = sbio->pagev[i];
1769 spage->io_error = 1;
1770 atomic64_inc(&dev_replace->num_write_errors);
1774 for (i = 0; i < sbio->page_count; i++)
1775 scrub_page_put(sbio->pagev[i]);
1779 scrub_pending_bio_dec(sctx);
1782 static int scrub_checksum(struct scrub_block *sblock)
1788 * No need to initialize these stats currently,
1789 * because this function only use return value
1790 * instead of these stats value.
1795 sblock->header_error = 0;
1796 sblock->generation_error = 0;
1797 sblock->checksum_error = 0;
1799 WARN_ON(sblock->page_count < 1);
1800 flags = sblock->pagev[0]->flags;
1802 if (flags & BTRFS_EXTENT_FLAG_DATA)
1803 ret = scrub_checksum_data(sblock);
1804 else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)
1805 ret = scrub_checksum_tree_block(sblock);
1806 else if (flags & BTRFS_EXTENT_FLAG_SUPER)
1807 (void)scrub_checksum_super(sblock);
1811 scrub_handle_errored_block(sblock);
1816 static int scrub_checksum_data(struct scrub_block *sblock)
1818 struct scrub_ctx *sctx = sblock->sctx;
1819 struct btrfs_fs_info *fs_info = sctx->fs_info;
1820 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
1821 u8 csum[BTRFS_CSUM_SIZE];
1822 struct scrub_page *spage;
1825 BUG_ON(sblock->page_count < 1);
1826 spage = sblock->pagev[0];
1827 if (!spage->have_csum)
1830 kaddr = page_address(spage->page);
1832 shash->tfm = fs_info->csum_shash;
1833 crypto_shash_init(shash);
1836 * In scrub_pages() and scrub_pages_for_parity() we ensure each spage
1837 * only contains one sector of data.
1839 crypto_shash_digest(shash, kaddr, fs_info->sectorsize, csum);
1841 if (memcmp(csum, spage->csum, fs_info->csum_size))
1842 sblock->checksum_error = 1;
1843 return sblock->checksum_error;
1846 static int scrub_checksum_tree_block(struct scrub_block *sblock)
1848 struct scrub_ctx *sctx = sblock->sctx;
1849 struct btrfs_header *h;
1850 struct btrfs_fs_info *fs_info = sctx->fs_info;
1851 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
1852 u8 calculated_csum[BTRFS_CSUM_SIZE];
1853 u8 on_disk_csum[BTRFS_CSUM_SIZE];
1855 * This is done in sectorsize steps even for metadata as there's a
1856 * constraint for nodesize to be aligned to sectorsize. This will need
1857 * to change so we don't misuse data and metadata units like that.
1859 const u32 sectorsize = sctx->fs_info->sectorsize;
1860 const int num_sectors = fs_info->nodesize >> fs_info->sectorsize_bits;
1862 struct scrub_page *spage;
1865 BUG_ON(sblock->page_count < 1);
1867 /* Each member in pagev is just one block, not a full page */
1868 ASSERT(sblock->page_count == num_sectors);
1870 spage = sblock->pagev[0];
1871 kaddr = page_address(spage->page);
1872 h = (struct btrfs_header *)kaddr;
1873 memcpy(on_disk_csum, h->csum, sctx->fs_info->csum_size);
1876 * we don't use the getter functions here, as we
1877 * a) don't have an extent buffer and
1878 * b) the page is already kmapped
1880 if (spage->logical != btrfs_stack_header_bytenr(h))
1881 sblock->header_error = 1;
1883 if (spage->generation != btrfs_stack_header_generation(h)) {
1884 sblock->header_error = 1;
1885 sblock->generation_error = 1;
1888 if (!scrub_check_fsid(h->fsid, spage))
1889 sblock->header_error = 1;
1891 if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
1893 sblock->header_error = 1;
1895 shash->tfm = fs_info->csum_shash;
1896 crypto_shash_init(shash);
1897 crypto_shash_update(shash, kaddr + BTRFS_CSUM_SIZE,
1898 sectorsize - BTRFS_CSUM_SIZE);
1900 for (i = 1; i < num_sectors; i++) {
1901 kaddr = page_address(sblock->pagev[i]->page);
1902 crypto_shash_update(shash, kaddr, sectorsize);
1905 crypto_shash_final(shash, calculated_csum);
1906 if (memcmp(calculated_csum, on_disk_csum, sctx->fs_info->csum_size))
1907 sblock->checksum_error = 1;
1909 return sblock->header_error || sblock->checksum_error;
1912 static int scrub_checksum_super(struct scrub_block *sblock)
1914 struct btrfs_super_block *s;
1915 struct scrub_ctx *sctx = sblock->sctx;
1916 struct btrfs_fs_info *fs_info = sctx->fs_info;
1917 SHASH_DESC_ON_STACK(shash, fs_info->csum_shash);
1918 u8 calculated_csum[BTRFS_CSUM_SIZE];
1919 struct scrub_page *spage;
1924 BUG_ON(sblock->page_count < 1);
1925 spage = sblock->pagev[0];
1926 kaddr = page_address(spage->page);
1927 s = (struct btrfs_super_block *)kaddr;
1929 if (spage->logical != btrfs_super_bytenr(s))
1932 if (spage->generation != btrfs_super_generation(s))
1935 if (!scrub_check_fsid(s->fsid, spage))
1938 shash->tfm = fs_info->csum_shash;
1939 crypto_shash_init(shash);
1940 crypto_shash_digest(shash, kaddr + BTRFS_CSUM_SIZE,
1941 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE, calculated_csum);
1943 if (memcmp(calculated_csum, s->csum, sctx->fs_info->csum_size))
1946 if (fail_cor + fail_gen) {
1948 * if we find an error in a super block, we just report it.
1949 * They will get written with the next transaction commit
1952 spin_lock(&sctx->stat_lock);
1953 ++sctx->stat.super_errors;
1954 spin_unlock(&sctx->stat_lock);
1956 btrfs_dev_stat_inc_and_print(spage->dev,
1957 BTRFS_DEV_STAT_CORRUPTION_ERRS);
1959 btrfs_dev_stat_inc_and_print(spage->dev,
1960 BTRFS_DEV_STAT_GENERATION_ERRS);
1963 return fail_cor + fail_gen;
1966 static void scrub_block_get(struct scrub_block *sblock)
1968 refcount_inc(&sblock->refs);
1971 static void scrub_block_put(struct scrub_block *sblock)
1973 if (refcount_dec_and_test(&sblock->refs)) {
1976 if (sblock->sparity)
1977 scrub_parity_put(sblock->sparity);
1979 for (i = 0; i < sblock->page_count; i++)
1980 scrub_page_put(sblock->pagev[i]);
1985 static void scrub_page_get(struct scrub_page *spage)
1987 atomic_inc(&spage->refs);
1990 static void scrub_page_put(struct scrub_page *spage)
1992 if (atomic_dec_and_test(&spage->refs)) {
1994 __free_page(spage->page);
1999 static void scrub_submit(struct scrub_ctx *sctx)
2001 struct scrub_bio *sbio;
2003 if (sctx->curr == -1)
2006 sbio = sctx->bios[sctx->curr];
2008 scrub_pending_bio_inc(sctx);
2009 btrfsic_submit_bio(sbio->bio);
2012 static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
2013 struct scrub_page *spage)
2015 struct scrub_block *sblock = spage->sblock;
2016 struct scrub_bio *sbio;
2021 * grab a fresh bio or wait for one to become available
2023 while (sctx->curr == -1) {
2024 spin_lock(&sctx->list_lock);
2025 sctx->curr = sctx->first_free;
2026 if (sctx->curr != -1) {
2027 sctx->first_free = sctx->bios[sctx->curr]->next_free;
2028 sctx->bios[sctx->curr]->next_free = -1;
2029 sctx->bios[sctx->curr]->page_count = 0;
2030 spin_unlock(&sctx->list_lock);
2032 spin_unlock(&sctx->list_lock);
2033 wait_event(sctx->list_wait, sctx->first_free != -1);
2036 sbio = sctx->bios[sctx->curr];
2037 if (sbio->page_count == 0) {
2040 sbio->physical = spage->physical;
2041 sbio->logical = spage->logical;
2042 sbio->dev = spage->dev;
2045 bio = btrfs_io_bio_alloc(sctx->pages_per_rd_bio);
2049 bio->bi_private = sbio;
2050 bio->bi_end_io = scrub_bio_end_io;
2051 bio_set_dev(bio, sbio->dev->bdev);
2052 bio->bi_iter.bi_sector = sbio->physical >> 9;
2053 bio->bi_opf = REQ_OP_READ;
2055 } else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
2057 sbio->logical + sbio->page_count * PAGE_SIZE !=
2059 sbio->dev != spage->dev) {
2064 sbio->pagev[sbio->page_count] = spage;
2065 ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
2066 if (ret != PAGE_SIZE) {
2067 if (sbio->page_count < 1) {
2076 scrub_block_get(sblock); /* one for the page added to the bio */
2077 atomic_inc(&sblock->outstanding_pages);
2079 if (sbio->page_count == sctx->pages_per_rd_bio)
2085 static void scrub_missing_raid56_end_io(struct bio *bio)
2087 struct scrub_block *sblock = bio->bi_private;
2088 struct btrfs_fs_info *fs_info = sblock->sctx->fs_info;
2091 sblock->no_io_error_seen = 0;
2095 btrfs_queue_work(fs_info->scrub_workers, &sblock->work);
2098 static void scrub_missing_raid56_worker(struct btrfs_work *work)
2100 struct scrub_block *sblock = container_of(work, struct scrub_block, work);
2101 struct scrub_ctx *sctx = sblock->sctx;
2102 struct btrfs_fs_info *fs_info = sctx->fs_info;
2104 struct btrfs_device *dev;
2106 logical = sblock->pagev[0]->logical;
2107 dev = sblock->pagev[0]->dev;
2109 if (sblock->no_io_error_seen)
2110 scrub_recheck_block_checksum(sblock);
2112 if (!sblock->no_io_error_seen) {
2113 spin_lock(&sctx->stat_lock);
2114 sctx->stat.read_errors++;
2115 spin_unlock(&sctx->stat_lock);
2116 btrfs_err_rl_in_rcu(fs_info,
2117 "IO error rebuilding logical %llu for dev %s",
2118 logical, rcu_str_deref(dev->name));
2119 } else if (sblock->header_error || sblock->checksum_error) {
2120 spin_lock(&sctx->stat_lock);
2121 sctx->stat.uncorrectable_errors++;
2122 spin_unlock(&sctx->stat_lock);
2123 btrfs_err_rl_in_rcu(fs_info,
2124 "failed to rebuild valid logical %llu for dev %s",
2125 logical, rcu_str_deref(dev->name));
2127 scrub_write_block_to_dev_replace(sblock);
2130 if (sctx->is_dev_replace && sctx->flush_all_writes) {
2131 mutex_lock(&sctx->wr_lock);
2132 scrub_wr_submit(sctx);
2133 mutex_unlock(&sctx->wr_lock);
2136 scrub_block_put(sblock);
2137 scrub_pending_bio_dec(sctx);
2140 static void scrub_missing_raid56_pages(struct scrub_block *sblock)
2142 struct scrub_ctx *sctx = sblock->sctx;
2143 struct btrfs_fs_info *fs_info = sctx->fs_info;
2144 u64 length = sblock->page_count * PAGE_SIZE;
2145 u64 logical = sblock->pagev[0]->logical;
2146 struct btrfs_bio *bbio = NULL;
2148 struct btrfs_raid_bio *rbio;
2152 btrfs_bio_counter_inc_blocked(fs_info);
2153 ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical,
2155 if (ret || !bbio || !bbio->raid_map)
2158 if (WARN_ON(!sctx->is_dev_replace ||
2159 !(bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK))) {
2161 * We shouldn't be scrubbing a missing device. Even for dev
2162 * replace, we should only get here for RAID 5/6. We either
2163 * managed to mount something with no mirrors remaining or
2164 * there's a bug in scrub_remap_extent()/btrfs_map_block().
2169 bio = btrfs_io_bio_alloc(0);
2170 bio->bi_iter.bi_sector = logical >> 9;
2171 bio->bi_private = sblock;
2172 bio->bi_end_io = scrub_missing_raid56_end_io;
2174 rbio = raid56_alloc_missing_rbio(fs_info, bio, bbio, length);
2178 for (i = 0; i < sblock->page_count; i++) {
2179 struct scrub_page *spage = sblock->pagev[i];
2181 raid56_add_scrub_pages(rbio, spage->page, spage->logical);
2184 btrfs_init_work(&sblock->work, scrub_missing_raid56_worker, NULL, NULL);
2185 scrub_block_get(sblock);
2186 scrub_pending_bio_inc(sctx);
2187 raid56_submit_missing_rbio(rbio);
2193 btrfs_bio_counter_dec(fs_info);
2194 btrfs_put_bbio(bbio);
2195 spin_lock(&sctx->stat_lock);
2196 sctx->stat.malloc_errors++;
2197 spin_unlock(&sctx->stat_lock);
2200 static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u32 len,
2201 u64 physical, struct btrfs_device *dev, u64 flags,
2202 u64 gen, int mirror_num, u8 *csum,
2203 u64 physical_for_dev_replace)
2205 struct scrub_block *sblock;
2206 const u32 sectorsize = sctx->fs_info->sectorsize;
2209 sblock = kzalloc(sizeof(*sblock), GFP_KERNEL);
2211 spin_lock(&sctx->stat_lock);
2212 sctx->stat.malloc_errors++;
2213 spin_unlock(&sctx->stat_lock);
2217 /* one ref inside this function, plus one for each page added to
2219 refcount_set(&sblock->refs, 1);
2220 sblock->sctx = sctx;
2221 sblock->no_io_error_seen = 1;
2223 for (index = 0; len > 0; index++) {
2224 struct scrub_page *spage;
2226 * Here we will allocate one page for one sector to scrub.
2227 * This is fine if PAGE_SIZE == sectorsize, but will cost
2228 * more memory for PAGE_SIZE > sectorsize case.
2230 u32 l = min(sectorsize, len);
2232 spage = kzalloc(sizeof(*spage), GFP_KERNEL);
2235 spin_lock(&sctx->stat_lock);
2236 sctx->stat.malloc_errors++;
2237 spin_unlock(&sctx->stat_lock);
2238 scrub_block_put(sblock);
2241 BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
2242 scrub_page_get(spage);
2243 sblock->pagev[index] = spage;
2244 spage->sblock = sblock;
2246 spage->flags = flags;
2247 spage->generation = gen;
2248 spage->logical = logical;
2249 spage->physical = physical;
2250 spage->physical_for_dev_replace = physical_for_dev_replace;
2251 spage->mirror_num = mirror_num;
2253 spage->have_csum = 1;
2254 memcpy(spage->csum, csum, sctx->fs_info->csum_size);
2256 spage->have_csum = 0;
2258 sblock->page_count++;
2259 spage->page = alloc_page(GFP_KERNEL);
2265 physical_for_dev_replace += l;
2268 WARN_ON(sblock->page_count == 0);
2269 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) {
2271 * This case should only be hit for RAID 5/6 device replace. See
2272 * the comment in scrub_missing_raid56_pages() for details.
2274 scrub_missing_raid56_pages(sblock);
2276 for (index = 0; index < sblock->page_count; index++) {
2277 struct scrub_page *spage = sblock->pagev[index];
2280 ret = scrub_add_page_to_rd_bio(sctx, spage);
2282 scrub_block_put(sblock);
2287 if (flags & BTRFS_EXTENT_FLAG_SUPER)
2291 /* last one frees, either here or in bio completion for last page */
2292 scrub_block_put(sblock);
2296 static void scrub_bio_end_io(struct bio *bio)
2298 struct scrub_bio *sbio = bio->bi_private;
2299 struct btrfs_fs_info *fs_info = sbio->dev->fs_info;
2301 sbio->status = bio->bi_status;
2304 btrfs_queue_work(fs_info->scrub_workers, &sbio->work);
2307 static void scrub_bio_end_io_worker(struct btrfs_work *work)
2309 struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
2310 struct scrub_ctx *sctx = sbio->sctx;
2313 BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO);
2315 for (i = 0; i < sbio->page_count; i++) {
2316 struct scrub_page *spage = sbio->pagev[i];
2318 spage->io_error = 1;
2319 spage->sblock->no_io_error_seen = 0;
2323 /* now complete the scrub_block items that have all pages completed */
2324 for (i = 0; i < sbio->page_count; i++) {
2325 struct scrub_page *spage = sbio->pagev[i];
2326 struct scrub_block *sblock = spage->sblock;
2328 if (atomic_dec_and_test(&sblock->outstanding_pages))
2329 scrub_block_complete(sblock);
2330 scrub_block_put(sblock);
2335 spin_lock(&sctx->list_lock);
2336 sbio->next_free = sctx->first_free;
2337 sctx->first_free = sbio->index;
2338 spin_unlock(&sctx->list_lock);
2340 if (sctx->is_dev_replace && sctx->flush_all_writes) {
2341 mutex_lock(&sctx->wr_lock);
2342 scrub_wr_submit(sctx);
2343 mutex_unlock(&sctx->wr_lock);
2346 scrub_pending_bio_dec(sctx);
2349 static inline void __scrub_mark_bitmap(struct scrub_parity *sparity,
2350 unsigned long *bitmap,
2355 u32 sectorsize_bits = sparity->sctx->fs_info->sectorsize_bits;
2357 if (len >= sparity->stripe_len) {
2358 bitmap_set(bitmap, 0, sparity->nsectors);
2362 start -= sparity->logic_start;
2363 start = div64_u64_rem(start, sparity->stripe_len, &offset);
2364 offset = offset >> sectorsize_bits;
2365 nsectors = len >> sectorsize_bits;
2367 if (offset + nsectors <= sparity->nsectors) {
2368 bitmap_set(bitmap, offset, nsectors);
2372 bitmap_set(bitmap, offset, sparity->nsectors - offset);
2373 bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset));
2376 static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity,
2379 __scrub_mark_bitmap(sparity, sparity->ebitmap, start, len);
2382 static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity,
2385 __scrub_mark_bitmap(sparity, sparity->dbitmap, start, len);
2388 static void scrub_block_complete(struct scrub_block *sblock)
2392 if (!sblock->no_io_error_seen) {
2394 scrub_handle_errored_block(sblock);
2397 * if has checksum error, write via repair mechanism in
2398 * dev replace case, otherwise write here in dev replace
2401 corrupted = scrub_checksum(sblock);
2402 if (!corrupted && sblock->sctx->is_dev_replace)
2403 scrub_write_block_to_dev_replace(sblock);
2406 if (sblock->sparity && corrupted && !sblock->data_corrected) {
2407 u64 start = sblock->pagev[0]->logical;
2408 u64 end = sblock->pagev[sblock->page_count - 1]->logical +
2411 ASSERT(end - start <= U32_MAX);
2412 scrub_parity_mark_sectors_error(sblock->sparity,
2413 start, end - start);
2417 static void drop_csum_range(struct scrub_ctx *sctx, struct btrfs_ordered_sum *sum)
2419 sctx->stat.csum_discards += sum->len >> sctx->fs_info->sectorsize_bits;
2420 list_del(&sum->list);
2425 * Find the desired csum for range [logical, logical + sectorsize), and store
2426 * the csum into @csum.
2428 * The search source is sctx->csum_list, which is a pre-populated list
2429 * storing bytenr ordered csum ranges. We're reponsible to cleanup any range
2430 * that is before @logical.
2432 * Return 0 if there is no csum for the range.
2433 * Return 1 if there is csum for the range and copied to @csum.
2435 static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u8 *csum)
2439 while (!list_empty(&sctx->csum_list)) {
2440 struct btrfs_ordered_sum *sum = NULL;
2441 unsigned long index;
2442 unsigned long num_sectors;
2444 sum = list_first_entry(&sctx->csum_list,
2445 struct btrfs_ordered_sum, list);
2446 /* The current csum range is beyond our range, no csum found */
2447 if (sum->bytenr > logical)
2451 * The current sum is before our bytenr, since scrub is always
2452 * done in bytenr order, the csum will never be used anymore,
2453 * clean it up so that later calls won't bother with the range,
2454 * and continue search the next range.
2456 if (sum->bytenr + sum->len <= logical) {
2457 drop_csum_range(sctx, sum);
2461 /* Now the csum range covers our bytenr, copy the csum */
2463 index = (logical - sum->bytenr) >> sctx->fs_info->sectorsize_bits;
2464 num_sectors = sum->len >> sctx->fs_info->sectorsize_bits;
2466 memcpy(csum, sum->sums + index * sctx->fs_info->csum_size,
2467 sctx->fs_info->csum_size);
2469 /* Cleanup the range if we're at the end of the csum range */
2470 if (index == num_sectors - 1)
2471 drop_csum_range(sctx, sum);
2479 /* scrub extent tries to collect up to 64 kB for each bio */
2480 static int scrub_extent(struct scrub_ctx *sctx, struct map_lookup *map,
2481 u64 logical, u32 len,
2482 u64 physical, struct btrfs_device *dev, u64 flags,
2483 u64 gen, int mirror_num, u64 physical_for_dev_replace)
2486 u8 csum[BTRFS_CSUM_SIZE];
2489 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2490 if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
2491 blocksize = map->stripe_len;
2493 blocksize = sctx->fs_info->sectorsize;
2494 spin_lock(&sctx->stat_lock);
2495 sctx->stat.data_extents_scrubbed++;
2496 sctx->stat.data_bytes_scrubbed += len;
2497 spin_unlock(&sctx->stat_lock);
2498 } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
2499 if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK)
2500 blocksize = map->stripe_len;
2502 blocksize = sctx->fs_info->nodesize;
2503 spin_lock(&sctx->stat_lock);
2504 sctx->stat.tree_extents_scrubbed++;
2505 sctx->stat.tree_bytes_scrubbed += len;
2506 spin_unlock(&sctx->stat_lock);
2508 blocksize = sctx->fs_info->sectorsize;
2513 u32 l = min(len, blocksize);
2516 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2517 /* push csums to sbio */
2518 have_csum = scrub_find_csum(sctx, logical, csum);
2520 ++sctx->stat.no_csum;
2522 ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen,
2523 mirror_num, have_csum ? csum : NULL,
2524 physical_for_dev_replace);
2530 physical_for_dev_replace += l;
2535 static int scrub_pages_for_parity(struct scrub_parity *sparity,
2536 u64 logical, u32 len,
2537 u64 physical, struct btrfs_device *dev,
2538 u64 flags, u64 gen, int mirror_num, u8 *csum)
2540 struct scrub_ctx *sctx = sparity->sctx;
2541 struct scrub_block *sblock;
2542 const u32 sectorsize = sctx->fs_info->sectorsize;
2545 ASSERT(IS_ALIGNED(len, sectorsize));
2547 sblock = kzalloc(sizeof(*sblock), GFP_KERNEL);
2549 spin_lock(&sctx->stat_lock);
2550 sctx->stat.malloc_errors++;
2551 spin_unlock(&sctx->stat_lock);
2555 /* one ref inside this function, plus one for each page added to
2557 refcount_set(&sblock->refs, 1);
2558 sblock->sctx = sctx;
2559 sblock->no_io_error_seen = 1;
2560 sblock->sparity = sparity;
2561 scrub_parity_get(sparity);
2563 for (index = 0; len > 0; index++) {
2564 struct scrub_page *spage;
2566 spage = kzalloc(sizeof(*spage), GFP_KERNEL);
2569 spin_lock(&sctx->stat_lock);
2570 sctx->stat.malloc_errors++;
2571 spin_unlock(&sctx->stat_lock);
2572 scrub_block_put(sblock);
2575 BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
2576 /* For scrub block */
2577 scrub_page_get(spage);
2578 sblock->pagev[index] = spage;
2579 /* For scrub parity */
2580 scrub_page_get(spage);
2581 list_add_tail(&spage->list, &sparity->spages);
2582 spage->sblock = sblock;
2584 spage->flags = flags;
2585 spage->generation = gen;
2586 spage->logical = logical;
2587 spage->physical = physical;
2588 spage->mirror_num = mirror_num;
2590 spage->have_csum = 1;
2591 memcpy(spage->csum, csum, sctx->fs_info->csum_size);
2593 spage->have_csum = 0;
2595 sblock->page_count++;
2596 spage->page = alloc_page(GFP_KERNEL);
2601 /* Iterate over the stripe range in sectorsize steps */
2603 logical += sectorsize;
2604 physical += sectorsize;
2607 WARN_ON(sblock->page_count == 0);
2608 for (index = 0; index < sblock->page_count; index++) {
2609 struct scrub_page *spage = sblock->pagev[index];
2612 ret = scrub_add_page_to_rd_bio(sctx, spage);
2614 scrub_block_put(sblock);
2619 /* last one frees, either here or in bio completion for last page */
2620 scrub_block_put(sblock);
2624 static int scrub_extent_for_parity(struct scrub_parity *sparity,
2625 u64 logical, u32 len,
2626 u64 physical, struct btrfs_device *dev,
2627 u64 flags, u64 gen, int mirror_num)
2629 struct scrub_ctx *sctx = sparity->sctx;
2631 u8 csum[BTRFS_CSUM_SIZE];
2634 if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) {
2635 scrub_parity_mark_sectors_error(sparity, logical, len);
2639 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2640 blocksize = sparity->stripe_len;
2641 } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
2642 blocksize = sparity->stripe_len;
2644 blocksize = sctx->fs_info->sectorsize;
2649 u32 l = min(len, blocksize);
2652 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2653 /* push csums to sbio */
2654 have_csum = scrub_find_csum(sctx, logical, csum);
2658 ret = scrub_pages_for_parity(sparity, logical, l, physical, dev,
2659 flags, gen, mirror_num,
2660 have_csum ? csum : NULL);
2672 * Given a physical address, this will calculate it's
2673 * logical offset. if this is a parity stripe, it will return
2674 * the most left data stripe's logical offset.
2676 * return 0 if it is a data stripe, 1 means parity stripe.
2678 static int get_raid56_logic_offset(u64 physical, int num,
2679 struct map_lookup *map, u64 *offset,
2688 const int data_stripes = nr_data_stripes(map);
2690 last_offset = (physical - map->stripes[num].physical) * data_stripes;
2692 *stripe_start = last_offset;
2694 *offset = last_offset;
2695 for (i = 0; i < data_stripes; i++) {
2696 *offset = last_offset + i * map->stripe_len;
2698 stripe_nr = div64_u64(*offset, map->stripe_len);
2699 stripe_nr = div_u64(stripe_nr, data_stripes);
2701 /* Work out the disk rotation on this stripe-set */
2702 stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, &rot);
2703 /* calculate which stripe this data locates */
2705 stripe_index = rot % map->num_stripes;
2706 if (stripe_index == num)
2708 if (stripe_index < num)
2711 *offset = last_offset + j * map->stripe_len;
2715 static void scrub_free_parity(struct scrub_parity *sparity)
2717 struct scrub_ctx *sctx = sparity->sctx;
2718 struct scrub_page *curr, *next;
2721 nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors);
2723 spin_lock(&sctx->stat_lock);
2724 sctx->stat.read_errors += nbits;
2725 sctx->stat.uncorrectable_errors += nbits;
2726 spin_unlock(&sctx->stat_lock);
2729 list_for_each_entry_safe(curr, next, &sparity->spages, list) {
2730 list_del_init(&curr->list);
2731 scrub_page_put(curr);
2737 static void scrub_parity_bio_endio_worker(struct btrfs_work *work)
2739 struct scrub_parity *sparity = container_of(work, struct scrub_parity,
2741 struct scrub_ctx *sctx = sparity->sctx;
2743 scrub_free_parity(sparity);
2744 scrub_pending_bio_dec(sctx);
2747 static void scrub_parity_bio_endio(struct bio *bio)
2749 struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private;
2750 struct btrfs_fs_info *fs_info = sparity->sctx->fs_info;
2753 bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
2758 btrfs_init_work(&sparity->work, scrub_parity_bio_endio_worker, NULL,
2760 btrfs_queue_work(fs_info->scrub_parity_workers, &sparity->work);
2763 static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
2765 struct scrub_ctx *sctx = sparity->sctx;
2766 struct btrfs_fs_info *fs_info = sctx->fs_info;
2768 struct btrfs_raid_bio *rbio;
2769 struct btrfs_bio *bbio = NULL;
2773 if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap,
2777 length = sparity->logic_end - sparity->logic_start;
2779 btrfs_bio_counter_inc_blocked(fs_info);
2780 ret = btrfs_map_sblock(fs_info, BTRFS_MAP_WRITE, sparity->logic_start,
2782 if (ret || !bbio || !bbio->raid_map)
2785 bio = btrfs_io_bio_alloc(0);
2786 bio->bi_iter.bi_sector = sparity->logic_start >> 9;
2787 bio->bi_private = sparity;
2788 bio->bi_end_io = scrub_parity_bio_endio;
2790 rbio = raid56_parity_alloc_scrub_rbio(fs_info, bio, bbio,
2791 length, sparity->scrub_dev,
2797 scrub_pending_bio_inc(sctx);
2798 raid56_parity_submit_scrub_rbio(rbio);
2804 btrfs_bio_counter_dec(fs_info);
2805 btrfs_put_bbio(bbio);
2806 bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
2808 spin_lock(&sctx->stat_lock);
2809 sctx->stat.malloc_errors++;
2810 spin_unlock(&sctx->stat_lock);
2812 scrub_free_parity(sparity);
2815 static inline int scrub_calc_parity_bitmap_len(int nsectors)
2817 return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * sizeof(long);
2820 static void scrub_parity_get(struct scrub_parity *sparity)
2822 refcount_inc(&sparity->refs);
2825 static void scrub_parity_put(struct scrub_parity *sparity)
2827 if (!refcount_dec_and_test(&sparity->refs))
2830 scrub_parity_check_and_repair(sparity);
2833 static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx,
2834 struct map_lookup *map,
2835 struct btrfs_device *sdev,
2836 struct btrfs_path *path,
2840 struct btrfs_fs_info *fs_info = sctx->fs_info;
2841 struct btrfs_root *root = fs_info->extent_root;
2842 struct btrfs_root *csum_root = fs_info->csum_root;
2843 struct btrfs_extent_item *extent;
2844 struct btrfs_bio *bbio = NULL;
2848 struct extent_buffer *l;
2849 struct btrfs_key key;
2852 u64 extent_physical;
2853 /* Check the comment in scrub_stripe() for why u32 is enough here */
2856 struct btrfs_device *extent_dev;
2857 struct scrub_parity *sparity;
2860 int extent_mirror_num;
2863 ASSERT(map->stripe_len <= U32_MAX);
2864 nsectors = map->stripe_len >> fs_info->sectorsize_bits;
2865 bitmap_len = scrub_calc_parity_bitmap_len(nsectors);
2866 sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len,
2869 spin_lock(&sctx->stat_lock);
2870 sctx->stat.malloc_errors++;
2871 spin_unlock(&sctx->stat_lock);
2875 ASSERT(map->stripe_len <= U32_MAX);
2876 sparity->stripe_len = map->stripe_len;
2877 sparity->nsectors = nsectors;
2878 sparity->sctx = sctx;
2879 sparity->scrub_dev = sdev;
2880 sparity->logic_start = logic_start;
2881 sparity->logic_end = logic_end;
2882 refcount_set(&sparity->refs, 1);
2883 INIT_LIST_HEAD(&sparity->spages);
2884 sparity->dbitmap = sparity->bitmap;
2885 sparity->ebitmap = (void *)sparity->bitmap + bitmap_len;
2888 while (logic_start < logic_end) {
2889 if (btrfs_fs_incompat(fs_info, SKINNY_METADATA))
2890 key.type = BTRFS_METADATA_ITEM_KEY;
2892 key.type = BTRFS_EXTENT_ITEM_KEY;
2893 key.objectid = logic_start;
2894 key.offset = (u64)-1;
2896 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2901 ret = btrfs_previous_extent_item(root, path, 0);
2905 btrfs_release_path(path);
2906 ret = btrfs_search_slot(NULL, root, &key,
2918 slot = path->slots[0];
2919 if (slot >= btrfs_header_nritems(l)) {
2920 ret = btrfs_next_leaf(root, path);
2929 btrfs_item_key_to_cpu(l, &key, slot);
2931 if (key.type != BTRFS_EXTENT_ITEM_KEY &&
2932 key.type != BTRFS_METADATA_ITEM_KEY)
2935 if (key.type == BTRFS_METADATA_ITEM_KEY)
2936 bytes = fs_info->nodesize;
2940 if (key.objectid + bytes <= logic_start)
2943 if (key.objectid >= logic_end) {
2948 while (key.objectid >= logic_start + map->stripe_len)
2949 logic_start += map->stripe_len;
2951 extent = btrfs_item_ptr(l, slot,
2952 struct btrfs_extent_item);
2953 flags = btrfs_extent_flags(l, extent);
2954 generation = btrfs_extent_generation(l, extent);
2956 if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) &&
2957 (key.objectid < logic_start ||
2958 key.objectid + bytes >
2959 logic_start + map->stripe_len)) {
2961 "scrub: tree block %llu spanning stripes, ignored. logical=%llu",
2962 key.objectid, logic_start);
2963 spin_lock(&sctx->stat_lock);
2964 sctx->stat.uncorrectable_errors++;
2965 spin_unlock(&sctx->stat_lock);
2969 extent_logical = key.objectid;
2970 ASSERT(bytes <= U32_MAX);
2973 if (extent_logical < logic_start) {
2974 extent_len -= logic_start - extent_logical;
2975 extent_logical = logic_start;
2978 if (extent_logical + extent_len >
2979 logic_start + map->stripe_len)
2980 extent_len = logic_start + map->stripe_len -
2983 scrub_parity_mark_sectors_data(sparity, extent_logical,
2986 mapped_length = extent_len;
2988 ret = btrfs_map_block(fs_info, BTRFS_MAP_READ,
2989 extent_logical, &mapped_length, &bbio,
2992 if (!bbio || mapped_length < extent_len)
2996 btrfs_put_bbio(bbio);
2999 extent_physical = bbio->stripes[0].physical;
3000 extent_mirror_num = bbio->mirror_num;
3001 extent_dev = bbio->stripes[0].dev;
3002 btrfs_put_bbio(bbio);
3004 ret = btrfs_lookup_csums_range(csum_root,
3006 extent_logical + extent_len - 1,
3007 &sctx->csum_list, 1);
3011 ret = scrub_extent_for_parity(sparity, extent_logical,
3018 scrub_free_csums(sctx);
3023 if (extent_logical + extent_len <
3024 key.objectid + bytes) {
3025 logic_start += map->stripe_len;
3027 if (logic_start >= logic_end) {
3032 if (logic_start < key.objectid + bytes) {
3041 btrfs_release_path(path);
3046 logic_start += map->stripe_len;
3050 ASSERT(logic_end - logic_start <= U32_MAX);
3051 scrub_parity_mark_sectors_error(sparity, logic_start,
3052 logic_end - logic_start);
3054 scrub_parity_put(sparity);
3056 mutex_lock(&sctx->wr_lock);
3057 scrub_wr_submit(sctx);
3058 mutex_unlock(&sctx->wr_lock);
3060 btrfs_release_path(path);
3061 return ret < 0 ? ret : 0;
3064 static void sync_replace_for_zoned(struct scrub_ctx *sctx)
3066 if (!btrfs_is_zoned(sctx->fs_info))
3069 sctx->flush_all_writes = true;
3071 mutex_lock(&sctx->wr_lock);
3072 scrub_wr_submit(sctx);
3073 mutex_unlock(&sctx->wr_lock);
3075 wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
3078 static int sync_write_pointer_for_zoned(struct scrub_ctx *sctx, u64 logical,
3079 u64 physical, u64 physical_end)
3081 struct btrfs_fs_info *fs_info = sctx->fs_info;
3084 if (!btrfs_is_zoned(fs_info))
3087 wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
3089 mutex_lock(&sctx->wr_lock);
3090 if (sctx->write_pointer < physical_end) {
3091 ret = btrfs_sync_zone_write_pointer(sctx->wr_tgtdev, logical,
3093 sctx->write_pointer);
3096 "zoned: failed to recover write pointer");
3098 mutex_unlock(&sctx->wr_lock);
3099 btrfs_dev_clear_zone_empty(sctx->wr_tgtdev, physical);
3104 static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
3105 struct map_lookup *map,
3106 struct btrfs_device *scrub_dev,
3107 int num, u64 base, u64 length,
3108 struct btrfs_block_group *cache)
3110 struct btrfs_path *path, *ppath;
3111 struct btrfs_fs_info *fs_info = sctx->fs_info;
3112 struct btrfs_root *root = fs_info->extent_root;
3113 struct btrfs_root *csum_root = fs_info->csum_root;
3114 struct btrfs_extent_item *extent;
3115 struct blk_plug plug;
3120 struct extent_buffer *l;
3127 struct reada_control *reada1;
3128 struct reada_control *reada2;
3129 struct btrfs_key key;
3130 struct btrfs_key key_end;
3131 u64 increment = map->stripe_len;
3134 u64 extent_physical;
3136 * Unlike chunk length, extent length should never go beyond
3137 * BTRFS_MAX_EXTENT_SIZE, thus u32 is enough here.
3142 struct btrfs_device *extent_dev;
3143 int extent_mirror_num;
3146 physical = map->stripes[num].physical;
3148 nstripes = div64_u64(length, map->stripe_len);
3149 if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
3150 offset = map->stripe_len * num;
3151 increment = map->stripe_len * map->num_stripes;
3153 } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
3154 int factor = map->num_stripes / map->sub_stripes;
3155 offset = map->stripe_len * (num / map->sub_stripes);
3156 increment = map->stripe_len * factor;
3157 mirror_num = num % map->sub_stripes + 1;
3158 } else if (map->type & BTRFS_BLOCK_GROUP_RAID1_MASK) {
3159 increment = map->stripe_len;
3160 mirror_num = num % map->num_stripes + 1;
3161 } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
3162 increment = map->stripe_len;
3163 mirror_num = num % map->num_stripes + 1;
3164 } else if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
3165 get_raid56_logic_offset(physical, num, map, &offset, NULL);
3166 increment = map->stripe_len * nr_data_stripes(map);
3169 increment = map->stripe_len;
3173 path = btrfs_alloc_path();
3177 ppath = btrfs_alloc_path();
3179 btrfs_free_path(path);
3184 * work on commit root. The related disk blocks are static as
3185 * long as COW is applied. This means, it is save to rewrite
3186 * them to repair disk errors without any race conditions
3188 path->search_commit_root = 1;
3189 path->skip_locking = 1;
3191 ppath->search_commit_root = 1;
3192 ppath->skip_locking = 1;
3194 * trigger the readahead for extent tree csum tree and wait for
3195 * completion. During readahead, the scrub is officially paused
3196 * to not hold off transaction commits
3198 logical = base + offset;
3199 physical_end = physical + nstripes * map->stripe_len;
3200 if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
3201 get_raid56_logic_offset(physical_end, num,
3202 map, &logic_end, NULL);
3205 logic_end = logical + increment * nstripes;
3207 wait_event(sctx->list_wait,
3208 atomic_read(&sctx->bios_in_flight) == 0);
3209 scrub_blocked_if_needed(fs_info);
3211 /* FIXME it might be better to start readahead at commit root */
3212 key.objectid = logical;
3213 key.type = BTRFS_EXTENT_ITEM_KEY;
3214 key.offset = (u64)0;
3215 key_end.objectid = logic_end;
3216 key_end.type = BTRFS_METADATA_ITEM_KEY;
3217 key_end.offset = (u64)-1;
3218 reada1 = btrfs_reada_add(root, &key, &key_end);
3220 if (cache->flags & BTRFS_BLOCK_GROUP_DATA) {
3221 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
3222 key.type = BTRFS_EXTENT_CSUM_KEY;
3223 key.offset = logical;
3224 key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
3225 key_end.type = BTRFS_EXTENT_CSUM_KEY;
3226 key_end.offset = logic_end;
3227 reada2 = btrfs_reada_add(csum_root, &key, &key_end);
3232 if (!IS_ERR(reada1))
3233 btrfs_reada_wait(reada1);
3234 if (!IS_ERR_OR_NULL(reada2))
3235 btrfs_reada_wait(reada2);
3239 * collect all data csums for the stripe to avoid seeking during
3240 * the scrub. This might currently (crc32) end up to be about 1MB
3242 blk_start_plug(&plug);
3244 if (sctx->is_dev_replace &&
3245 btrfs_dev_is_sequential(sctx->wr_tgtdev, physical)) {
3246 mutex_lock(&sctx->wr_lock);
3247 sctx->write_pointer = physical;
3248 mutex_unlock(&sctx->wr_lock);
3249 sctx->flush_all_writes = true;
3253 * now find all extents for each stripe and scrub them
3256 while (physical < physical_end) {
3260 if (atomic_read(&fs_info->scrub_cancel_req) ||
3261 atomic_read(&sctx->cancel_req)) {
3266 * check to see if we have to pause
3268 if (atomic_read(&fs_info->scrub_pause_req)) {
3269 /* push queued extents */
3270 sctx->flush_all_writes = true;
3272 mutex_lock(&sctx->wr_lock);
3273 scrub_wr_submit(sctx);
3274 mutex_unlock(&sctx->wr_lock);
3275 wait_event(sctx->list_wait,
3276 atomic_read(&sctx->bios_in_flight) == 0);
3277 sctx->flush_all_writes = false;
3278 scrub_blocked_if_needed(fs_info);
3281 if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
3282 ret = get_raid56_logic_offset(physical, num, map,
3287 /* it is parity strip */
3288 stripe_logical += base;
3289 stripe_end = stripe_logical + increment;
3290 ret = scrub_raid56_parity(sctx, map, scrub_dev,
3291 ppath, stripe_logical,
3299 if (btrfs_fs_incompat(fs_info, SKINNY_METADATA))
3300 key.type = BTRFS_METADATA_ITEM_KEY;
3302 key.type = BTRFS_EXTENT_ITEM_KEY;
3303 key.objectid = logical;
3304 key.offset = (u64)-1;
3306 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3311 ret = btrfs_previous_extent_item(root, path, 0);
3315 /* there's no smaller item, so stick with the
3317 btrfs_release_path(path);
3318 ret = btrfs_search_slot(NULL, root, &key,
3330 slot = path->slots[0];
3331 if (slot >= btrfs_header_nritems(l)) {
3332 ret = btrfs_next_leaf(root, path);
3341 btrfs_item_key_to_cpu(l, &key, slot);
3343 if (key.type != BTRFS_EXTENT_ITEM_KEY &&
3344 key.type != BTRFS_METADATA_ITEM_KEY)
3347 if (key.type == BTRFS_METADATA_ITEM_KEY)
3348 bytes = fs_info->nodesize;
3352 if (key.objectid + bytes <= logical)
3355 if (key.objectid >= logical + map->stripe_len) {
3356 /* out of this device extent */
3357 if (key.objectid >= logic_end)
3363 * If our block group was removed in the meanwhile, just
3364 * stop scrubbing since there is no point in continuing.
3365 * Continuing would prevent reusing its device extents
3366 * for new block groups for a long time.
3368 spin_lock(&cache->lock);
3369 if (cache->removed) {
3370 spin_unlock(&cache->lock);
3374 spin_unlock(&cache->lock);
3376 extent = btrfs_item_ptr(l, slot,
3377 struct btrfs_extent_item);
3378 flags = btrfs_extent_flags(l, extent);
3379 generation = btrfs_extent_generation(l, extent);
3381 if ((flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) &&
3382 (key.objectid < logical ||
3383 key.objectid + bytes >
3384 logical + map->stripe_len)) {
3386 "scrub: tree block %llu spanning stripes, ignored. logical=%llu",
3387 key.objectid, logical);
3388 spin_lock(&sctx->stat_lock);
3389 sctx->stat.uncorrectable_errors++;
3390 spin_unlock(&sctx->stat_lock);
3395 extent_logical = key.objectid;
3396 ASSERT(bytes <= U32_MAX);
3400 * trim extent to this stripe
3402 if (extent_logical < logical) {
3403 extent_len -= logical - extent_logical;
3404 extent_logical = logical;
3406 if (extent_logical + extent_len >
3407 logical + map->stripe_len) {
3408 extent_len = logical + map->stripe_len -
3412 extent_physical = extent_logical - logical + physical;
3413 extent_dev = scrub_dev;
3414 extent_mirror_num = mirror_num;
3415 if (sctx->is_dev_replace)
3416 scrub_remap_extent(fs_info, extent_logical,
3417 extent_len, &extent_physical,
3419 &extent_mirror_num);
3421 if (flags & BTRFS_EXTENT_FLAG_DATA) {
3422 ret = btrfs_lookup_csums_range(csum_root,
3424 extent_logical + extent_len - 1,
3425 &sctx->csum_list, 1);
3430 ret = scrub_extent(sctx, map, extent_logical, extent_len,
3431 extent_physical, extent_dev, flags,
3432 generation, extent_mirror_num,
3433 extent_logical - logical + physical);
3435 scrub_free_csums(sctx);
3440 if (sctx->is_dev_replace)
3441 sync_replace_for_zoned(sctx);
3443 if (extent_logical + extent_len <
3444 key.objectid + bytes) {
3445 if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
3447 * loop until we find next data stripe
3448 * or we have finished all stripes.
3451 physical += map->stripe_len;
3452 ret = get_raid56_logic_offset(physical,
3457 if (ret && physical < physical_end) {
3458 stripe_logical += base;
3459 stripe_end = stripe_logical +
3461 ret = scrub_raid56_parity(sctx,
3462 map, scrub_dev, ppath,
3470 physical += map->stripe_len;
3471 logical += increment;
3473 if (logical < key.objectid + bytes) {
3478 if (physical >= physical_end) {
3486 btrfs_release_path(path);
3488 logical += increment;
3489 physical += map->stripe_len;
3490 spin_lock(&sctx->stat_lock);
3492 sctx->stat.last_physical = map->stripes[num].physical +
3495 sctx->stat.last_physical = physical;
3496 spin_unlock(&sctx->stat_lock);
3501 /* push queued extents */
3503 mutex_lock(&sctx->wr_lock);
3504 scrub_wr_submit(sctx);
3505 mutex_unlock(&sctx->wr_lock);
3507 blk_finish_plug(&plug);
3508 btrfs_free_path(path);
3509 btrfs_free_path(ppath);
3511 if (sctx->is_dev_replace && ret >= 0) {
3514 ret2 = sync_write_pointer_for_zoned(sctx, base + offset,
3515 map->stripes[num].physical,
3521 return ret < 0 ? ret : 0;
3524 static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx,
3525 struct btrfs_device *scrub_dev,
3526 u64 chunk_offset, u64 length,
3528 struct btrfs_block_group *cache)
3530 struct btrfs_fs_info *fs_info = sctx->fs_info;
3531 struct extent_map_tree *map_tree = &fs_info->mapping_tree;
3532 struct map_lookup *map;
3533 struct extent_map *em;
3537 read_lock(&map_tree->lock);
3538 em = lookup_extent_mapping(map_tree, chunk_offset, 1);
3539 read_unlock(&map_tree->lock);
3543 * Might have been an unused block group deleted by the cleaner
3544 * kthread or relocation.
3546 spin_lock(&cache->lock);
3547 if (!cache->removed)
3549 spin_unlock(&cache->lock);
3554 map = em->map_lookup;
3555 if (em->start != chunk_offset)
3558 if (em->len < length)
3561 for (i = 0; i < map->num_stripes; ++i) {
3562 if (map->stripes[i].dev->bdev == scrub_dev->bdev &&
3563 map->stripes[i].physical == dev_offset) {
3564 ret = scrub_stripe(sctx, map, scrub_dev, i,
3565 chunk_offset, length, cache);
3571 free_extent_map(em);
3576 static int finish_extent_writes_for_zoned(struct btrfs_root *root,
3577 struct btrfs_block_group *cache)
3579 struct btrfs_fs_info *fs_info = cache->fs_info;
3580 struct btrfs_trans_handle *trans;
3582 if (!btrfs_is_zoned(fs_info))
3585 btrfs_wait_block_group_reservations(cache);
3586 btrfs_wait_nocow_writers(cache);
3587 btrfs_wait_ordered_roots(fs_info, U64_MAX, cache->start, cache->length);
3589 trans = btrfs_join_transaction(root);
3591 return PTR_ERR(trans);
3592 return btrfs_commit_transaction(trans);
3595 static noinline_for_stack
3596 int scrub_enumerate_chunks(struct scrub_ctx *sctx,
3597 struct btrfs_device *scrub_dev, u64 start, u64 end)
3599 struct btrfs_dev_extent *dev_extent = NULL;
3600 struct btrfs_path *path;
3601 struct btrfs_fs_info *fs_info = sctx->fs_info;
3602 struct btrfs_root *root = fs_info->dev_root;
3608 struct extent_buffer *l;
3609 struct btrfs_key key;
3610 struct btrfs_key found_key;
3611 struct btrfs_block_group *cache;
3612 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
3614 path = btrfs_alloc_path();
3618 path->reada = READA_FORWARD;
3619 path->search_commit_root = 1;
3620 path->skip_locking = 1;
3622 key.objectid = scrub_dev->devid;
3624 key.type = BTRFS_DEV_EXTENT_KEY;
3627 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3631 if (path->slots[0] >=
3632 btrfs_header_nritems(path->nodes[0])) {
3633 ret = btrfs_next_leaf(root, path);
3646 slot = path->slots[0];
3648 btrfs_item_key_to_cpu(l, &found_key, slot);
3650 if (found_key.objectid != scrub_dev->devid)
3653 if (found_key.type != BTRFS_DEV_EXTENT_KEY)
3656 if (found_key.offset >= end)
3659 if (found_key.offset < key.offset)
3662 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
3663 length = btrfs_dev_extent_length(l, dev_extent);
3665 if (found_key.offset + length <= start)
3668 chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent);
3671 * get a reference on the corresponding block group to prevent
3672 * the chunk from going away while we scrub it
3674 cache = btrfs_lookup_block_group(fs_info, chunk_offset);
3676 /* some chunks are removed but not committed to disk yet,
3677 * continue scrubbing */
3681 if (sctx->is_dev_replace && btrfs_is_zoned(fs_info)) {
3682 spin_lock(&cache->lock);
3683 if (!cache->to_copy) {
3684 spin_unlock(&cache->lock);
3688 spin_unlock(&cache->lock);
3692 * Make sure that while we are scrubbing the corresponding block
3693 * group doesn't get its logical address and its device extents
3694 * reused for another block group, which can possibly be of a
3695 * different type and different profile. We do this to prevent
3696 * false error detections and crashes due to bogus attempts to
3699 spin_lock(&cache->lock);
3700 if (cache->removed) {
3701 spin_unlock(&cache->lock);
3702 btrfs_put_block_group(cache);
3705 btrfs_freeze_block_group(cache);
3706 spin_unlock(&cache->lock);
3709 * we need call btrfs_inc_block_group_ro() with scrubs_paused,
3710 * to avoid deadlock caused by:
3711 * btrfs_inc_block_group_ro()
3712 * -> btrfs_wait_for_commit()
3713 * -> btrfs_commit_transaction()
3714 * -> btrfs_scrub_pause()
3716 scrub_pause_on(fs_info);
3719 * Don't do chunk preallocation for scrub.
3721 * This is especially important for SYSTEM bgs, or we can hit
3722 * -EFBIG from btrfs_finish_chunk_alloc() like:
3723 * 1. The only SYSTEM bg is marked RO.
3724 * Since SYSTEM bg is small, that's pretty common.
3725 * 2. New SYSTEM bg will be allocated
3726 * Due to regular version will allocate new chunk.
3727 * 3. New SYSTEM bg is empty and will get cleaned up
3728 * Before cleanup really happens, it's marked RO again.
3729 * 4. Empty SYSTEM bg get scrubbed
3732 * This can easily boost the amount of SYSTEM chunks if cleaner
3733 * thread can't be triggered fast enough, and use up all space
3734 * of btrfs_super_block::sys_chunk_array
3736 * While for dev replace, we need to try our best to mark block
3737 * group RO, to prevent race between:
3738 * - Write duplication
3739 * Contains latest data
3741 * Contains data from commit tree
3743 * If target block group is not marked RO, nocow writes can
3744 * be overwritten by scrub copy, causing data corruption.
3745 * So for dev-replace, it's not allowed to continue if a block
3748 ret = btrfs_inc_block_group_ro(cache, sctx->is_dev_replace);
3749 if (!ret && sctx->is_dev_replace) {
3750 ret = finish_extent_writes_for_zoned(root, cache);
3752 btrfs_dec_block_group_ro(cache);
3753 scrub_pause_off(fs_info);
3754 btrfs_put_block_group(cache);
3761 } else if (ret == -ENOSPC && !sctx->is_dev_replace) {
3763 * btrfs_inc_block_group_ro return -ENOSPC when it
3764 * failed in creating new chunk for metadata.
3765 * It is not a problem for scrub, because
3766 * metadata are always cowed, and our scrub paused
3767 * commit_transactions.
3770 } else if (ret == -ETXTBSY) {
3772 "skipping scrub of block group %llu due to active swapfile",
3774 scrub_pause_off(fs_info);
3779 "failed setting block group ro: %d", ret);
3780 btrfs_unfreeze_block_group(cache);
3781 btrfs_put_block_group(cache);
3782 scrub_pause_off(fs_info);
3787 * Now the target block is marked RO, wait for nocow writes to
3788 * finish before dev-replace.
3789 * COW is fine, as COW never overwrites extents in commit tree.
3791 if (sctx->is_dev_replace) {
3792 btrfs_wait_nocow_writers(cache);
3793 btrfs_wait_ordered_roots(fs_info, U64_MAX, cache->start,
3797 scrub_pause_off(fs_info);
3798 down_write(&dev_replace->rwsem);
3799 dev_replace->cursor_right = found_key.offset + length;
3800 dev_replace->cursor_left = found_key.offset;
3801 dev_replace->item_needs_writeback = 1;
3802 up_write(&dev_replace->rwsem);
3804 ret = scrub_chunk(sctx, scrub_dev, chunk_offset, length,
3805 found_key.offset, cache);
3808 * flush, submit all pending read and write bios, afterwards
3810 * Note that in the dev replace case, a read request causes
3811 * write requests that are submitted in the read completion
3812 * worker. Therefore in the current situation, it is required
3813 * that all write requests are flushed, so that all read and
3814 * write requests are really completed when bios_in_flight
3817 sctx->flush_all_writes = true;
3819 mutex_lock(&sctx->wr_lock);
3820 scrub_wr_submit(sctx);
3821 mutex_unlock(&sctx->wr_lock);
3823 wait_event(sctx->list_wait,
3824 atomic_read(&sctx->bios_in_flight) == 0);
3826 scrub_pause_on(fs_info);
3829 * must be called before we decrease @scrub_paused.
3830 * make sure we don't block transaction commit while
3831 * we are waiting pending workers finished.
3833 wait_event(sctx->list_wait,
3834 atomic_read(&sctx->workers_pending) == 0);
3835 sctx->flush_all_writes = false;
3837 scrub_pause_off(fs_info);
3839 if (sctx->is_dev_replace &&
3840 !btrfs_finish_block_group_to_copy(dev_replace->srcdev,
3841 cache, found_key.offset))
3845 down_write(&dev_replace->rwsem);
3846 dev_replace->cursor_left = dev_replace->cursor_right;
3847 dev_replace->item_needs_writeback = 1;
3848 up_write(&dev_replace->rwsem);
3851 btrfs_dec_block_group_ro(cache);
3854 * We might have prevented the cleaner kthread from deleting
3855 * this block group if it was already unused because we raced
3856 * and set it to RO mode first. So add it back to the unused
3857 * list, otherwise it might not ever be deleted unless a manual
3858 * balance is triggered or it becomes used and unused again.
3860 spin_lock(&cache->lock);
3861 if (!cache->removed && !cache->ro && cache->reserved == 0 &&
3863 spin_unlock(&cache->lock);
3864 if (btrfs_test_opt(fs_info, DISCARD_ASYNC))
3865 btrfs_discard_queue_work(&fs_info->discard_ctl,
3868 btrfs_mark_bg_unused(cache);
3870 spin_unlock(&cache->lock);
3873 btrfs_unfreeze_block_group(cache);
3874 btrfs_put_block_group(cache);
3877 if (sctx->is_dev_replace &&
3878 atomic64_read(&dev_replace->num_write_errors) > 0) {
3882 if (sctx->stat.malloc_errors > 0) {
3887 key.offset = found_key.offset + length;
3888 btrfs_release_path(path);
3891 btrfs_free_path(path);
3896 static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx,
3897 struct btrfs_device *scrub_dev)
3903 struct btrfs_fs_info *fs_info = sctx->fs_info;
3905 if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state))
3908 /* Seed devices of a new filesystem has their own generation. */
3909 if (scrub_dev->fs_devices != fs_info->fs_devices)
3910 gen = scrub_dev->generation;
3912 gen = fs_info->last_trans_committed;
3914 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
3915 bytenr = btrfs_sb_offset(i);
3916 if (bytenr + BTRFS_SUPER_INFO_SIZE >
3917 scrub_dev->commit_total_bytes)
3919 if (!btrfs_check_super_location(scrub_dev, bytenr))
3922 ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr,
3923 scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i,
3928 wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
3933 static void scrub_workers_put(struct btrfs_fs_info *fs_info)
3935 if (refcount_dec_and_mutex_lock(&fs_info->scrub_workers_refcnt,
3936 &fs_info->scrub_lock)) {
3937 struct btrfs_workqueue *scrub_workers = NULL;
3938 struct btrfs_workqueue *scrub_wr_comp = NULL;
3939 struct btrfs_workqueue *scrub_parity = NULL;
3941 scrub_workers = fs_info->scrub_workers;
3942 scrub_wr_comp = fs_info->scrub_wr_completion_workers;
3943 scrub_parity = fs_info->scrub_parity_workers;
3945 fs_info->scrub_workers = NULL;
3946 fs_info->scrub_wr_completion_workers = NULL;
3947 fs_info->scrub_parity_workers = NULL;
3948 mutex_unlock(&fs_info->scrub_lock);
3950 btrfs_destroy_workqueue(scrub_workers);
3951 btrfs_destroy_workqueue(scrub_wr_comp);
3952 btrfs_destroy_workqueue(scrub_parity);
3957 * get a reference count on fs_info->scrub_workers. start worker if necessary
3959 static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
3962 struct btrfs_workqueue *scrub_workers = NULL;
3963 struct btrfs_workqueue *scrub_wr_comp = NULL;
3964 struct btrfs_workqueue *scrub_parity = NULL;
3965 unsigned int flags = WQ_FREEZABLE | WQ_UNBOUND;
3966 int max_active = fs_info->thread_pool_size;
3969 if (refcount_inc_not_zero(&fs_info->scrub_workers_refcnt))
3972 scrub_workers = btrfs_alloc_workqueue(fs_info, "scrub", flags,
3973 is_dev_replace ? 1 : max_active, 4);
3975 goto fail_scrub_workers;
3977 scrub_wr_comp = btrfs_alloc_workqueue(fs_info, "scrubwrc", flags,
3980 goto fail_scrub_wr_completion_workers;
3982 scrub_parity = btrfs_alloc_workqueue(fs_info, "scrubparity", flags,
3985 goto fail_scrub_parity_workers;
3987 mutex_lock(&fs_info->scrub_lock);
3988 if (refcount_read(&fs_info->scrub_workers_refcnt) == 0) {
3989 ASSERT(fs_info->scrub_workers == NULL &&
3990 fs_info->scrub_wr_completion_workers == NULL &&
3991 fs_info->scrub_parity_workers == NULL);
3992 fs_info->scrub_workers = scrub_workers;
3993 fs_info->scrub_wr_completion_workers = scrub_wr_comp;
3994 fs_info->scrub_parity_workers = scrub_parity;
3995 refcount_set(&fs_info->scrub_workers_refcnt, 1);
3996 mutex_unlock(&fs_info->scrub_lock);
3999 /* Other thread raced in and created the workers for us */
4000 refcount_inc(&fs_info->scrub_workers_refcnt);
4001 mutex_unlock(&fs_info->scrub_lock);
4004 btrfs_destroy_workqueue(scrub_parity);
4005 fail_scrub_parity_workers:
4006 btrfs_destroy_workqueue(scrub_wr_comp);
4007 fail_scrub_wr_completion_workers:
4008 btrfs_destroy_workqueue(scrub_workers);
4013 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
4014 u64 end, struct btrfs_scrub_progress *progress,
4015 int readonly, int is_dev_replace)
4017 struct scrub_ctx *sctx;
4019 struct btrfs_device *dev;
4020 unsigned int nofs_flag;
4022 if (btrfs_fs_closing(fs_info))
4025 if (fs_info->nodesize > BTRFS_STRIPE_LEN) {
4027 * in this case scrub is unable to calculate the checksum
4028 * the way scrub is implemented. Do not handle this
4029 * situation at all because it won't ever happen.
4032 "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails",
4038 if (fs_info->nodesize >
4039 PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK ||
4040 fs_info->sectorsize > PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) {
4042 * would exhaust the array bounds of pagev member in
4043 * struct scrub_block
4046 "scrub: size assumption nodesize and sectorsize <= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails",
4048 SCRUB_MAX_PAGES_PER_BLOCK,
4049 fs_info->sectorsize,
4050 SCRUB_MAX_PAGES_PER_BLOCK);
4054 /* Allocate outside of device_list_mutex */
4055 sctx = scrub_setup_ctx(fs_info, is_dev_replace);
4057 return PTR_ERR(sctx);
4059 ret = scrub_workers_get(fs_info, is_dev_replace);
4063 mutex_lock(&fs_info->fs_devices->device_list_mutex);
4064 dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL);
4065 if (!dev || (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state) &&
4067 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4072 if (!is_dev_replace && !readonly &&
4073 !test_bit(BTRFS_DEV_STATE_WRITEABLE, &dev->dev_state)) {
4074 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4075 btrfs_err_in_rcu(fs_info,
4076 "scrub on devid %llu: filesystem on %s is not writable",
4077 devid, rcu_str_deref(dev->name));
4082 mutex_lock(&fs_info->scrub_lock);
4083 if (!test_bit(BTRFS_DEV_STATE_IN_FS_METADATA, &dev->dev_state) ||
4084 test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &dev->dev_state)) {
4085 mutex_unlock(&fs_info->scrub_lock);
4086 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4091 down_read(&fs_info->dev_replace.rwsem);
4092 if (dev->scrub_ctx ||
4094 btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) {
4095 up_read(&fs_info->dev_replace.rwsem);
4096 mutex_unlock(&fs_info->scrub_lock);
4097 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4101 up_read(&fs_info->dev_replace.rwsem);
4103 sctx->readonly = readonly;
4104 dev->scrub_ctx = sctx;
4105 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4108 * checking @scrub_pause_req here, we can avoid
4109 * race between committing transaction and scrubbing.
4111 __scrub_blocked_if_needed(fs_info);
4112 atomic_inc(&fs_info->scrubs_running);
4113 mutex_unlock(&fs_info->scrub_lock);
4116 * In order to avoid deadlock with reclaim when there is a transaction
4117 * trying to pause scrub, make sure we use GFP_NOFS for all the
4118 * allocations done at btrfs_scrub_pages() and scrub_pages_for_parity()
4119 * invoked by our callees. The pausing request is done when the
4120 * transaction commit starts, and it blocks the transaction until scrub
4121 * is paused (done at specific points at scrub_stripe() or right above
4122 * before incrementing fs_info->scrubs_running).
4124 nofs_flag = memalloc_nofs_save();
4125 if (!is_dev_replace) {
4126 btrfs_info(fs_info, "scrub: started on devid %llu", devid);
4128 * by holding device list mutex, we can
4129 * kick off writing super in log tree sync.
4131 mutex_lock(&fs_info->fs_devices->device_list_mutex);
4132 ret = scrub_supers(sctx, dev);
4133 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4137 ret = scrub_enumerate_chunks(sctx, dev, start, end);
4138 memalloc_nofs_restore(nofs_flag);
4140 wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
4141 atomic_dec(&fs_info->scrubs_running);
4142 wake_up(&fs_info->scrub_pause_wait);
4144 wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0);
4147 memcpy(progress, &sctx->stat, sizeof(*progress));
4149 if (!is_dev_replace)
4150 btrfs_info(fs_info, "scrub: %s on devid %llu with status: %d",
4151 ret ? "not finished" : "finished", devid, ret);
4153 mutex_lock(&fs_info->scrub_lock);
4154 dev->scrub_ctx = NULL;
4155 mutex_unlock(&fs_info->scrub_lock);
4157 scrub_workers_put(fs_info);
4158 scrub_put_ctx(sctx);
4162 scrub_workers_put(fs_info);
4164 scrub_free_ctx(sctx);
4169 void btrfs_scrub_pause(struct btrfs_fs_info *fs_info)
4171 mutex_lock(&fs_info->scrub_lock);
4172 atomic_inc(&fs_info->scrub_pause_req);
4173 while (atomic_read(&fs_info->scrubs_paused) !=
4174 atomic_read(&fs_info->scrubs_running)) {
4175 mutex_unlock(&fs_info->scrub_lock);
4176 wait_event(fs_info->scrub_pause_wait,
4177 atomic_read(&fs_info->scrubs_paused) ==
4178 atomic_read(&fs_info->scrubs_running));
4179 mutex_lock(&fs_info->scrub_lock);
4181 mutex_unlock(&fs_info->scrub_lock);
4184 void btrfs_scrub_continue(struct btrfs_fs_info *fs_info)
4186 atomic_dec(&fs_info->scrub_pause_req);
4187 wake_up(&fs_info->scrub_pause_wait);
4190 int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info)
4192 mutex_lock(&fs_info->scrub_lock);
4193 if (!atomic_read(&fs_info->scrubs_running)) {
4194 mutex_unlock(&fs_info->scrub_lock);
4198 atomic_inc(&fs_info->scrub_cancel_req);
4199 while (atomic_read(&fs_info->scrubs_running)) {
4200 mutex_unlock(&fs_info->scrub_lock);
4201 wait_event(fs_info->scrub_pause_wait,
4202 atomic_read(&fs_info->scrubs_running) == 0);
4203 mutex_lock(&fs_info->scrub_lock);
4205 atomic_dec(&fs_info->scrub_cancel_req);
4206 mutex_unlock(&fs_info->scrub_lock);
4211 int btrfs_scrub_cancel_dev(struct btrfs_device *dev)
4213 struct btrfs_fs_info *fs_info = dev->fs_info;
4214 struct scrub_ctx *sctx;
4216 mutex_lock(&fs_info->scrub_lock);
4217 sctx = dev->scrub_ctx;
4219 mutex_unlock(&fs_info->scrub_lock);
4222 atomic_inc(&sctx->cancel_req);
4223 while (dev->scrub_ctx) {
4224 mutex_unlock(&fs_info->scrub_lock);
4225 wait_event(fs_info->scrub_pause_wait,
4226 dev->scrub_ctx == NULL);
4227 mutex_lock(&fs_info->scrub_lock);
4229 mutex_unlock(&fs_info->scrub_lock);
4234 int btrfs_scrub_progress(struct btrfs_fs_info *fs_info, u64 devid,
4235 struct btrfs_scrub_progress *progress)
4237 struct btrfs_device *dev;
4238 struct scrub_ctx *sctx = NULL;
4240 mutex_lock(&fs_info->fs_devices->device_list_mutex);
4241 dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL);
4243 sctx = dev->scrub_ctx;
4245 memcpy(progress, &sctx->stat, sizeof(*progress));
4246 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
4248 return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV;
4251 static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
4252 u64 extent_logical, u32 extent_len,
4253 u64 *extent_physical,
4254 struct btrfs_device **extent_dev,
4255 int *extent_mirror_num)
4258 struct btrfs_bio *bbio = NULL;
4261 mapped_length = extent_len;
4262 ret = btrfs_map_block(fs_info, BTRFS_MAP_READ, extent_logical,
4263 &mapped_length, &bbio, 0);
4264 if (ret || !bbio || mapped_length < extent_len ||
4265 !bbio->stripes[0].dev->bdev) {
4266 btrfs_put_bbio(bbio);
4270 *extent_physical = bbio->stripes[0].physical;
4271 *extent_mirror_num = bbio->mirror_num;
4272 *extent_dev = bbio->stripes[0].dev;
4273 btrfs_put_bbio(bbio);