2 * Copyright (C) 2011, 2012 STRATO. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/blkdev.h>
20 #include <linux/ratelimit.h>
24 #include "ordered-data.h"
25 #include "transaction.h"
27 #include "extent_io.h"
28 #include "dev-replace.h"
29 #include "check-integrity.h"
30 #include "rcu-string.h"
34 * This is only the first step towards a full-features scrub. It reads all
35 * extent and super block and verifies the checksums. In case a bad checksum
36 * is found or the extent cannot be read, good data will be written back if
39 * Future enhancements:
40 * - In case an unrepairable extent is encountered, track which files are
41 * affected and report them
42 * - track and record media errors, throw out bad devices
43 * - add a mode to also read unallocated space
50 * the following three values only influence the performance.
51 * The last one configures the number of parallel and outstanding I/O
52 * operations. The first two values configure an upper limit for the number
53 * of (dynamically allocated) pages that are added to a bio.
55 #define SCRUB_PAGES_PER_RD_BIO 32 /* 128k per bio */
56 #define SCRUB_PAGES_PER_WR_BIO 32 /* 128k per bio */
57 #define SCRUB_BIOS_PER_SCTX 64 /* 8MB per device in flight */
60 * the following value times PAGE_SIZE needs to be large enough to match the
61 * largest node/leaf/sector size that shall be supported.
62 * Values larger than BTRFS_STRIPE_LEN are not supported.
64 #define SCRUB_MAX_PAGES_PER_BLOCK 16 /* 64k per node/leaf/sector */
66 struct scrub_recover {
68 struct btrfs_bio *bbio;
73 struct scrub_block *sblock;
75 struct btrfs_device *dev;
76 struct list_head list;
77 u64 flags; /* extent flags */
81 u64 physical_for_dev_replace;
84 unsigned int mirror_num:8;
85 unsigned int have_csum:1;
86 unsigned int io_error:1;
88 u8 csum[BTRFS_CSUM_SIZE];
90 struct scrub_recover *recover;
95 struct scrub_ctx *sctx;
96 struct btrfs_device *dev;
101 #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO
102 struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO];
104 struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO];
108 struct btrfs_work work;
112 struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK];
114 atomic_t outstanding_pages;
115 atomic_t ref_count; /* free mem on transition to zero */
116 struct scrub_ctx *sctx;
117 struct scrub_parity *sparity;
119 unsigned int header_error:1;
120 unsigned int checksum_error:1;
121 unsigned int no_io_error_seen:1;
122 unsigned int generation_error:1; /* also sets header_error */
124 /* The following is for the data used to check parity */
125 /* It is for the data with checksum */
126 unsigned int data_corrected:1;
130 /* Used for the chunks with parity stripe such RAID5/6 */
131 struct scrub_parity {
132 struct scrub_ctx *sctx;
134 struct btrfs_device *scrub_dev;
146 struct list_head spages;
148 /* Work of parity check and repair */
149 struct btrfs_work work;
151 /* Mark the parity blocks which have data */
152 unsigned long *dbitmap;
155 * Mark the parity blocks which have data, but errors happen when
156 * read data or check data
158 unsigned long *ebitmap;
160 unsigned long bitmap[0];
163 struct scrub_wr_ctx {
164 struct scrub_bio *wr_curr_bio;
165 struct btrfs_device *tgtdev;
166 int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */
167 atomic_t flush_all_writes;
168 struct mutex wr_lock;
172 struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX];
173 struct btrfs_root *dev_root;
176 atomic_t bios_in_flight;
177 atomic_t workers_pending;
178 spinlock_t list_lock;
179 wait_queue_head_t list_wait;
181 struct list_head csum_list;
184 int pages_per_rd_bio;
189 struct scrub_wr_ctx wr_ctx;
194 struct btrfs_scrub_progress stat;
195 spinlock_t stat_lock;
198 struct scrub_fixup_nodatasum {
199 struct scrub_ctx *sctx;
200 struct btrfs_device *dev;
202 struct btrfs_root *root;
203 struct btrfs_work work;
207 struct scrub_nocow_inode {
211 struct list_head list;
214 struct scrub_copy_nocow_ctx {
215 struct scrub_ctx *sctx;
219 u64 physical_for_dev_replace;
220 struct list_head inodes;
221 struct btrfs_work work;
224 struct scrub_warning {
225 struct btrfs_path *path;
226 u64 extent_item_size;
230 struct btrfs_device *dev;
233 static void scrub_pending_bio_inc(struct scrub_ctx *sctx);
234 static void scrub_pending_bio_dec(struct scrub_ctx *sctx);
235 static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx);
236 static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx);
237 static int scrub_handle_errored_block(struct scrub_block *sblock_to_check);
238 static int scrub_setup_recheck_block(struct scrub_ctx *sctx,
239 struct btrfs_fs_info *fs_info,
240 struct scrub_block *original_sblock,
241 u64 length, u64 logical,
242 struct scrub_block *sblocks_for_recheck);
243 static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
244 struct scrub_block *sblock, int is_metadata,
245 int have_csum, u8 *csum, u64 generation,
246 u16 csum_size, int retry_failed_mirror);
247 static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info,
248 struct scrub_block *sblock,
249 int is_metadata, int have_csum,
250 const u8 *csum, u64 generation,
252 static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
253 struct scrub_block *sblock_good,
255 static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
256 struct scrub_block *sblock_good,
257 int page_num, int force_write);
258 static void scrub_write_block_to_dev_replace(struct scrub_block *sblock);
259 static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
261 static int scrub_checksum_data(struct scrub_block *sblock);
262 static int scrub_checksum_tree_block(struct scrub_block *sblock);
263 static int scrub_checksum_super(struct scrub_block *sblock);
264 static void scrub_block_get(struct scrub_block *sblock);
265 static void scrub_block_put(struct scrub_block *sblock);
266 static void scrub_page_get(struct scrub_page *spage);
267 static void scrub_page_put(struct scrub_page *spage);
268 static void scrub_parity_get(struct scrub_parity *sparity);
269 static void scrub_parity_put(struct scrub_parity *sparity);
270 static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
271 struct scrub_page *spage);
272 static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
273 u64 physical, struct btrfs_device *dev, u64 flags,
274 u64 gen, int mirror_num, u8 *csum, int force,
275 u64 physical_for_dev_replace);
276 static void scrub_bio_end_io(struct bio *bio, int err);
277 static void scrub_bio_end_io_worker(struct btrfs_work *work);
278 static void scrub_block_complete(struct scrub_block *sblock);
279 static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
280 u64 extent_logical, u64 extent_len,
281 u64 *extent_physical,
282 struct btrfs_device **extent_dev,
283 int *extent_mirror_num);
284 static int scrub_setup_wr_ctx(struct scrub_ctx *sctx,
285 struct scrub_wr_ctx *wr_ctx,
286 struct btrfs_fs_info *fs_info,
287 struct btrfs_device *dev,
289 static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx);
290 static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
291 struct scrub_page *spage);
292 static void scrub_wr_submit(struct scrub_ctx *sctx);
293 static void scrub_wr_bio_end_io(struct bio *bio, int err);
294 static void scrub_wr_bio_end_io_worker(struct btrfs_work *work);
295 static int write_page_nocow(struct scrub_ctx *sctx,
296 u64 physical_for_dev_replace, struct page *page);
297 static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root,
298 struct scrub_copy_nocow_ctx *ctx);
299 static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
300 int mirror_num, u64 physical_for_dev_replace);
301 static void copy_nocow_pages_worker(struct btrfs_work *work);
302 static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info);
303 static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info);
306 static void scrub_pending_bio_inc(struct scrub_ctx *sctx)
308 atomic_inc(&sctx->bios_in_flight);
311 static void scrub_pending_bio_dec(struct scrub_ctx *sctx)
313 atomic_dec(&sctx->bios_in_flight);
314 wake_up(&sctx->list_wait);
317 static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
319 while (atomic_read(&fs_info->scrub_pause_req)) {
320 mutex_unlock(&fs_info->scrub_lock);
321 wait_event(fs_info->scrub_pause_wait,
322 atomic_read(&fs_info->scrub_pause_req) == 0);
323 mutex_lock(&fs_info->scrub_lock);
327 static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
329 atomic_inc(&fs_info->scrubs_paused);
330 wake_up(&fs_info->scrub_pause_wait);
332 mutex_lock(&fs_info->scrub_lock);
333 __scrub_blocked_if_needed(fs_info);
334 atomic_dec(&fs_info->scrubs_paused);
335 mutex_unlock(&fs_info->scrub_lock);
337 wake_up(&fs_info->scrub_pause_wait);
341 * used for workers that require transaction commits (i.e., for the
344 static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx)
346 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
349 * increment scrubs_running to prevent cancel requests from
350 * completing as long as a worker is running. we must also
351 * increment scrubs_paused to prevent deadlocking on pause
352 * requests used for transactions commits (as the worker uses a
353 * transaction context). it is safe to regard the worker
354 * as paused for all matters practical. effectively, we only
355 * avoid cancellation requests from completing.
357 mutex_lock(&fs_info->scrub_lock);
358 atomic_inc(&fs_info->scrubs_running);
359 atomic_inc(&fs_info->scrubs_paused);
360 mutex_unlock(&fs_info->scrub_lock);
363 * check if @scrubs_running=@scrubs_paused condition
364 * inside wait_event() is not an atomic operation.
365 * which means we may inc/dec @scrub_running/paused
366 * at any time. Let's wake up @scrub_pause_wait as
367 * much as we can to let commit transaction blocked less.
369 wake_up(&fs_info->scrub_pause_wait);
371 atomic_inc(&sctx->workers_pending);
374 /* used for workers that require transaction commits */
375 static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx)
377 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
380 * see scrub_pending_trans_workers_inc() why we're pretending
381 * to be paused in the scrub counters
383 mutex_lock(&fs_info->scrub_lock);
384 atomic_dec(&fs_info->scrubs_running);
385 atomic_dec(&fs_info->scrubs_paused);
386 mutex_unlock(&fs_info->scrub_lock);
387 atomic_dec(&sctx->workers_pending);
388 wake_up(&fs_info->scrub_pause_wait);
389 wake_up(&sctx->list_wait);
392 static void scrub_free_csums(struct scrub_ctx *sctx)
394 while (!list_empty(&sctx->csum_list)) {
395 struct btrfs_ordered_sum *sum;
396 sum = list_first_entry(&sctx->csum_list,
397 struct btrfs_ordered_sum, list);
398 list_del(&sum->list);
403 static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx)
410 scrub_free_wr_ctx(&sctx->wr_ctx);
412 /* this can happen when scrub is cancelled */
413 if (sctx->curr != -1) {
414 struct scrub_bio *sbio = sctx->bios[sctx->curr];
416 for (i = 0; i < sbio->page_count; i++) {
417 WARN_ON(!sbio->pagev[i]->page);
418 scrub_block_put(sbio->pagev[i]->sblock);
423 for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
424 struct scrub_bio *sbio = sctx->bios[i];
431 scrub_free_csums(sctx);
435 static noinline_for_stack
436 struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
438 struct scrub_ctx *sctx;
440 struct btrfs_fs_info *fs_info = dev->dev_root->fs_info;
441 int pages_per_rd_bio;
445 * the setting of pages_per_rd_bio is correct for scrub but might
446 * be wrong for the dev_replace code where we might read from
447 * different devices in the initial huge bios. However, that
448 * code is able to correctly handle the case when adding a page
452 pages_per_rd_bio = min_t(int, SCRUB_PAGES_PER_RD_BIO,
453 bio_get_nr_vecs(dev->bdev));
455 pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO;
456 sctx = kzalloc(sizeof(*sctx), GFP_NOFS);
459 sctx->is_dev_replace = is_dev_replace;
460 sctx->pages_per_rd_bio = pages_per_rd_bio;
462 sctx->dev_root = dev->dev_root;
463 for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
464 struct scrub_bio *sbio;
466 sbio = kzalloc(sizeof(*sbio), GFP_NOFS);
469 sctx->bios[i] = sbio;
473 sbio->page_count = 0;
474 btrfs_init_work(&sbio->work, btrfs_scrub_helper,
475 scrub_bio_end_io_worker, NULL, NULL);
477 if (i != SCRUB_BIOS_PER_SCTX - 1)
478 sctx->bios[i]->next_free = i + 1;
480 sctx->bios[i]->next_free = -1;
482 sctx->first_free = 0;
483 sctx->nodesize = dev->dev_root->nodesize;
484 sctx->sectorsize = dev->dev_root->sectorsize;
485 atomic_set(&sctx->bios_in_flight, 0);
486 atomic_set(&sctx->workers_pending, 0);
487 atomic_set(&sctx->cancel_req, 0);
488 sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy);
489 INIT_LIST_HEAD(&sctx->csum_list);
491 spin_lock_init(&sctx->list_lock);
492 spin_lock_init(&sctx->stat_lock);
493 init_waitqueue_head(&sctx->list_wait);
495 ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info,
496 fs_info->dev_replace.tgtdev, is_dev_replace);
498 scrub_free_ctx(sctx);
504 scrub_free_ctx(sctx);
505 return ERR_PTR(-ENOMEM);
508 static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root,
515 struct extent_buffer *eb;
516 struct btrfs_inode_item *inode_item;
517 struct scrub_warning *swarn = warn_ctx;
518 struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info;
519 struct inode_fs_paths *ipath = NULL;
520 struct btrfs_root *local_root;
521 struct btrfs_key root_key;
522 struct btrfs_key key;
524 root_key.objectid = root;
525 root_key.type = BTRFS_ROOT_ITEM_KEY;
526 root_key.offset = (u64)-1;
527 local_root = btrfs_read_fs_root_no_name(fs_info, &root_key);
528 if (IS_ERR(local_root)) {
529 ret = PTR_ERR(local_root);
534 * this makes the path point to (inum INODE_ITEM ioff)
537 key.type = BTRFS_INODE_ITEM_KEY;
540 ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0);
542 btrfs_release_path(swarn->path);
546 eb = swarn->path->nodes[0];
547 inode_item = btrfs_item_ptr(eb, swarn->path->slots[0],
548 struct btrfs_inode_item);
549 isize = btrfs_inode_size(eb, inode_item);
550 nlink = btrfs_inode_nlink(eb, inode_item);
551 btrfs_release_path(swarn->path);
553 ipath = init_ipath(4096, local_root, swarn->path);
555 ret = PTR_ERR(ipath);
559 ret = paths_from_inode(inum, ipath);
565 * we deliberately ignore the bit ipath might have been too small to
566 * hold all of the paths here
568 for (i = 0; i < ipath->fspath->elem_cnt; ++i)
569 printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev "
570 "%s, sector %llu, root %llu, inode %llu, offset %llu, "
571 "length %llu, links %u (path: %s)\n", swarn->errstr,
572 swarn->logical, rcu_str_deref(swarn->dev->name),
573 (unsigned long long)swarn->sector, root, inum, offset,
574 min(isize - offset, (u64)PAGE_SIZE), nlink,
575 (char *)(unsigned long)ipath->fspath->val[i]);
581 printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev "
582 "%s, sector %llu, root %llu, inode %llu, offset %llu: path "
583 "resolving failed with ret=%d\n", swarn->errstr,
584 swarn->logical, rcu_str_deref(swarn->dev->name),
585 (unsigned long long)swarn->sector, root, inum, offset, ret);
591 static void scrub_print_warning(const char *errstr, struct scrub_block *sblock)
593 struct btrfs_device *dev;
594 struct btrfs_fs_info *fs_info;
595 struct btrfs_path *path;
596 struct btrfs_key found_key;
597 struct extent_buffer *eb;
598 struct btrfs_extent_item *ei;
599 struct scrub_warning swarn;
600 unsigned long ptr = 0;
608 WARN_ON(sblock->page_count < 1);
609 dev = sblock->pagev[0]->dev;
610 fs_info = sblock->sctx->dev_root->fs_info;
612 path = btrfs_alloc_path();
616 swarn.sector = (sblock->pagev[0]->physical) >> 9;
617 swarn.logical = sblock->pagev[0]->logical;
618 swarn.errstr = errstr;
621 ret = extent_from_logical(fs_info, swarn.logical, path, &found_key,
626 extent_item_pos = swarn.logical - found_key.objectid;
627 swarn.extent_item_size = found_key.offset;
630 ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item);
631 item_size = btrfs_item_size_nr(eb, path->slots[0]);
633 if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
635 ret = tree_backref_for_extent(&ptr, eb, &found_key, ei,
636 item_size, &ref_root,
638 printk_in_rcu(KERN_WARNING
639 "BTRFS: %s at logical %llu on dev %s, "
640 "sector %llu: metadata %s (level %d) in tree "
641 "%llu\n", errstr, swarn.logical,
642 rcu_str_deref(dev->name),
643 (unsigned long long)swarn.sector,
644 ref_level ? "node" : "leaf",
645 ret < 0 ? -1 : ref_level,
646 ret < 0 ? -1 : ref_root);
648 btrfs_release_path(path);
650 btrfs_release_path(path);
653 iterate_extent_inodes(fs_info, found_key.objectid,
655 scrub_print_warning_inode, &swarn);
659 btrfs_free_path(path);
662 static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx)
664 struct page *page = NULL;
666 struct scrub_fixup_nodatasum *fixup = fixup_ctx;
669 struct btrfs_key key;
670 struct inode *inode = NULL;
671 struct btrfs_fs_info *fs_info;
672 u64 end = offset + PAGE_SIZE - 1;
673 struct btrfs_root *local_root;
677 key.type = BTRFS_ROOT_ITEM_KEY;
678 key.offset = (u64)-1;
680 fs_info = fixup->root->fs_info;
681 srcu_index = srcu_read_lock(&fs_info->subvol_srcu);
683 local_root = btrfs_read_fs_root_no_name(fs_info, &key);
684 if (IS_ERR(local_root)) {
685 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
686 return PTR_ERR(local_root);
689 key.type = BTRFS_INODE_ITEM_KEY;
692 inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
693 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
695 return PTR_ERR(inode);
697 index = offset >> PAGE_CACHE_SHIFT;
699 page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
705 if (PageUptodate(page)) {
706 if (PageDirty(page)) {
708 * we need to write the data to the defect sector. the
709 * data that was in that sector is not in memory,
710 * because the page was modified. we must not write the
711 * modified page to that sector.
713 * TODO: what could be done here: wait for the delalloc
714 * runner to write out that page (might involve
715 * COW) and see whether the sector is still
716 * referenced afterwards.
718 * For the meantime, we'll treat this error
719 * incorrectable, although there is a chance that a
720 * later scrub will find the bad sector again and that
721 * there's no dirty page in memory, then.
726 ret = repair_io_failure(inode, offset, PAGE_SIZE,
727 fixup->logical, page,
728 offset - page_offset(page),
734 * we need to get good data first. the general readpage path
735 * will call repair_io_failure for us, we just have to make
736 * sure we read the bad mirror.
738 ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end,
739 EXTENT_DAMAGED, GFP_NOFS);
741 /* set_extent_bits should give proper error */
748 ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page,
751 wait_on_page_locked(page);
753 corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset,
754 end, EXTENT_DAMAGED, 0, NULL);
756 clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end,
757 EXTENT_DAMAGED, GFP_NOFS);
769 if (ret == 0 && corrected) {
771 * we only need to call readpage for one of the inodes belonging
772 * to this extent. so make iterate_extent_inodes stop
780 static void scrub_fixup_nodatasum(struct btrfs_work *work)
783 struct scrub_fixup_nodatasum *fixup;
784 struct scrub_ctx *sctx;
785 struct btrfs_trans_handle *trans = NULL;
786 struct btrfs_path *path;
787 int uncorrectable = 0;
789 fixup = container_of(work, struct scrub_fixup_nodatasum, work);
792 path = btrfs_alloc_path();
794 spin_lock(&sctx->stat_lock);
795 ++sctx->stat.malloc_errors;
796 spin_unlock(&sctx->stat_lock);
801 trans = btrfs_join_transaction(fixup->root);
808 * the idea is to trigger a regular read through the standard path. we
809 * read a page from the (failed) logical address by specifying the
810 * corresponding copynum of the failed sector. thus, that readpage is
812 * that is the point where on-the-fly error correction will kick in
813 * (once it's finished) and rewrite the failed sector if a good copy
816 ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info,
817 path, scrub_fixup_readpage,
825 spin_lock(&sctx->stat_lock);
826 ++sctx->stat.corrected_errors;
827 spin_unlock(&sctx->stat_lock);
830 if (trans && !IS_ERR(trans))
831 btrfs_end_transaction(trans, fixup->root);
833 spin_lock(&sctx->stat_lock);
834 ++sctx->stat.uncorrectable_errors;
835 spin_unlock(&sctx->stat_lock);
836 btrfs_dev_replace_stats_inc(
837 &sctx->dev_root->fs_info->dev_replace.
838 num_uncorrectable_read_errors);
839 printk_ratelimited_in_rcu(KERN_ERR "BTRFS: "
840 "unable to fixup (nodatasum) error at logical %llu on dev %s\n",
841 fixup->logical, rcu_str_deref(fixup->dev->name));
844 btrfs_free_path(path);
847 scrub_pending_trans_workers_dec(sctx);
850 static inline void scrub_get_recover(struct scrub_recover *recover)
852 atomic_inc(&recover->refs);
855 static inline void scrub_put_recover(struct scrub_recover *recover)
857 if (atomic_dec_and_test(&recover->refs)) {
858 btrfs_put_bbio(recover->bbio);
864 * scrub_handle_errored_block gets called when either verification of the
865 * pages failed or the bio failed to read, e.g. with EIO. In the latter
866 * case, this function handles all pages in the bio, even though only one
868 * The goal of this function is to repair the errored block by using the
869 * contents of one of the mirrors.
871 static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
873 struct scrub_ctx *sctx = sblock_to_check->sctx;
874 struct btrfs_device *dev;
875 struct btrfs_fs_info *fs_info;
879 unsigned int failed_mirror_index;
880 unsigned int is_metadata;
881 unsigned int have_csum;
883 struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */
884 struct scrub_block *sblock_bad;
889 static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL,
890 DEFAULT_RATELIMIT_BURST);
892 BUG_ON(sblock_to_check->page_count < 1);
893 fs_info = sctx->dev_root->fs_info;
894 if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) {
896 * if we find an error in a super block, we just report it.
897 * They will get written with the next transaction commit
900 spin_lock(&sctx->stat_lock);
901 ++sctx->stat.super_errors;
902 spin_unlock(&sctx->stat_lock);
905 length = sblock_to_check->page_count * PAGE_SIZE;
906 logical = sblock_to_check->pagev[0]->logical;
907 generation = sblock_to_check->pagev[0]->generation;
908 BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1);
909 failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1;
910 is_metadata = !(sblock_to_check->pagev[0]->flags &
911 BTRFS_EXTENT_FLAG_DATA);
912 have_csum = sblock_to_check->pagev[0]->have_csum;
913 csum = sblock_to_check->pagev[0]->csum;
914 dev = sblock_to_check->pagev[0]->dev;
916 if (sctx->is_dev_replace && !is_metadata && !have_csum) {
917 sblocks_for_recheck = NULL;
922 * read all mirrors one after the other. This includes to
923 * re-read the extent or metadata block that failed (that was
924 * the cause that this fixup code is called) another time,
925 * page by page this time in order to know which pages
926 * caused I/O errors and which ones are good (for all mirrors).
927 * It is the goal to handle the situation when more than one
928 * mirror contains I/O errors, but the errors do not
929 * overlap, i.e. the data can be repaired by selecting the
930 * pages from those mirrors without I/O error on the
931 * particular pages. One example (with blocks >= 2 * PAGE_SIZE)
932 * would be that mirror #1 has an I/O error on the first page,
933 * the second page is good, and mirror #2 has an I/O error on
934 * the second page, but the first page is good.
935 * Then the first page of the first mirror can be repaired by
936 * taking the first page of the second mirror, and the
937 * second page of the second mirror can be repaired by
938 * copying the contents of the 2nd page of the 1st mirror.
939 * One more note: if the pages of one mirror contain I/O
940 * errors, the checksum cannot be verified. In order to get
941 * the best data for repairing, the first attempt is to find
942 * a mirror without I/O errors and with a validated checksum.
943 * Only if this is not possible, the pages are picked from
944 * mirrors with I/O errors without considering the checksum.
945 * If the latter is the case, at the end, the checksum of the
946 * repaired area is verified in order to correctly maintain
950 sblocks_for_recheck = kzalloc(BTRFS_MAX_MIRRORS *
951 sizeof(*sblocks_for_recheck),
953 if (!sblocks_for_recheck) {
954 spin_lock(&sctx->stat_lock);
955 sctx->stat.malloc_errors++;
956 sctx->stat.read_errors++;
957 sctx->stat.uncorrectable_errors++;
958 spin_unlock(&sctx->stat_lock);
959 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
963 /* setup the context, map the logical blocks and alloc the pages */
964 ret = scrub_setup_recheck_block(sctx, fs_info, sblock_to_check, length,
965 logical, sblocks_for_recheck);
967 spin_lock(&sctx->stat_lock);
968 sctx->stat.read_errors++;
969 sctx->stat.uncorrectable_errors++;
970 spin_unlock(&sctx->stat_lock);
971 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
974 BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS);
975 sblock_bad = sblocks_for_recheck + failed_mirror_index;
977 /* build and submit the bios for the failed mirror, check checksums */
978 scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum,
979 csum, generation, sctx->csum_size, 1);
981 if (!sblock_bad->header_error && !sblock_bad->checksum_error &&
982 sblock_bad->no_io_error_seen) {
984 * the error disappeared after reading page by page, or
985 * the area was part of a huge bio and other parts of the
986 * bio caused I/O errors, or the block layer merged several
987 * read requests into one and the error is caused by a
988 * different bio (usually one of the two latter cases is
991 spin_lock(&sctx->stat_lock);
992 sctx->stat.unverified_errors++;
993 sblock_to_check->data_corrected = 1;
994 spin_unlock(&sctx->stat_lock);
996 if (sctx->is_dev_replace)
997 scrub_write_block_to_dev_replace(sblock_bad);
1001 if (!sblock_bad->no_io_error_seen) {
1002 spin_lock(&sctx->stat_lock);
1003 sctx->stat.read_errors++;
1004 spin_unlock(&sctx->stat_lock);
1005 if (__ratelimit(&_rs))
1006 scrub_print_warning("i/o error", sblock_to_check);
1007 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
1008 } else if (sblock_bad->checksum_error) {
1009 spin_lock(&sctx->stat_lock);
1010 sctx->stat.csum_errors++;
1011 spin_unlock(&sctx->stat_lock);
1012 if (__ratelimit(&_rs))
1013 scrub_print_warning("checksum error", sblock_to_check);
1014 btrfs_dev_stat_inc_and_print(dev,
1015 BTRFS_DEV_STAT_CORRUPTION_ERRS);
1016 } else if (sblock_bad->header_error) {
1017 spin_lock(&sctx->stat_lock);
1018 sctx->stat.verify_errors++;
1019 spin_unlock(&sctx->stat_lock);
1020 if (__ratelimit(&_rs))
1021 scrub_print_warning("checksum/header error",
1023 if (sblock_bad->generation_error)
1024 btrfs_dev_stat_inc_and_print(dev,
1025 BTRFS_DEV_STAT_GENERATION_ERRS);
1027 btrfs_dev_stat_inc_and_print(dev,
1028 BTRFS_DEV_STAT_CORRUPTION_ERRS);
1031 if (sctx->readonly) {
1032 ASSERT(!sctx->is_dev_replace);
1036 if (!is_metadata && !have_csum) {
1037 struct scrub_fixup_nodatasum *fixup_nodatasum;
1040 WARN_ON(sctx->is_dev_replace);
1043 * !is_metadata and !have_csum, this means that the data
1044 * might not be COW'ed, that it might be modified
1045 * concurrently. The general strategy to work on the
1046 * commit root does not help in the case when COW is not
1049 fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS);
1050 if (!fixup_nodatasum)
1051 goto did_not_correct_error;
1052 fixup_nodatasum->sctx = sctx;
1053 fixup_nodatasum->dev = dev;
1054 fixup_nodatasum->logical = logical;
1055 fixup_nodatasum->root = fs_info->extent_root;
1056 fixup_nodatasum->mirror_num = failed_mirror_index + 1;
1057 scrub_pending_trans_workers_inc(sctx);
1058 btrfs_init_work(&fixup_nodatasum->work, btrfs_scrub_helper,
1059 scrub_fixup_nodatasum, NULL, NULL);
1060 btrfs_queue_work(fs_info->scrub_workers,
1061 &fixup_nodatasum->work);
1066 * now build and submit the bios for the other mirrors, check
1068 * First try to pick the mirror which is completely without I/O
1069 * errors and also does not have a checksum error.
1070 * If one is found, and if a checksum is present, the full block
1071 * that is known to contain an error is rewritten. Afterwards
1072 * the block is known to be corrected.
1073 * If a mirror is found which is completely correct, and no
1074 * checksum is present, only those pages are rewritten that had
1075 * an I/O error in the block to be repaired, since it cannot be
1076 * determined, which copy of the other pages is better (and it
1077 * could happen otherwise that a correct page would be
1078 * overwritten by a bad one).
1080 for (mirror_index = 0;
1081 mirror_index < BTRFS_MAX_MIRRORS &&
1082 sblocks_for_recheck[mirror_index].page_count > 0;
1084 struct scrub_block *sblock_other;
1086 if (mirror_index == failed_mirror_index)
1088 sblock_other = sblocks_for_recheck + mirror_index;
1090 /* build and submit the bios, check checksums */
1091 scrub_recheck_block(fs_info, sblock_other, is_metadata,
1092 have_csum, csum, generation,
1093 sctx->csum_size, 0);
1095 if (!sblock_other->header_error &&
1096 !sblock_other->checksum_error &&
1097 sblock_other->no_io_error_seen) {
1098 if (sctx->is_dev_replace) {
1099 scrub_write_block_to_dev_replace(sblock_other);
1101 int force_write = is_metadata || have_csum;
1103 ret = scrub_repair_block_from_good_copy(
1104 sblock_bad, sblock_other,
1108 goto corrected_error;
1113 * for dev_replace, pick good pages and write to the target device.
1115 if (sctx->is_dev_replace) {
1117 for (page_num = 0; page_num < sblock_bad->page_count;
1122 for (mirror_index = 0;
1123 mirror_index < BTRFS_MAX_MIRRORS &&
1124 sblocks_for_recheck[mirror_index].page_count > 0;
1126 struct scrub_block *sblock_other =
1127 sblocks_for_recheck + mirror_index;
1128 struct scrub_page *page_other =
1129 sblock_other->pagev[page_num];
1131 if (!page_other->io_error) {
1132 ret = scrub_write_page_to_dev_replace(
1133 sblock_other, page_num);
1135 /* succeeded for this page */
1139 btrfs_dev_replace_stats_inc(
1141 fs_info->dev_replace.
1149 * did not find a mirror to fetch the page
1150 * from. scrub_write_page_to_dev_replace()
1151 * handles this case (page->io_error), by
1152 * filling the block with zeros before
1153 * submitting the write request
1156 ret = scrub_write_page_to_dev_replace(
1157 sblock_bad, page_num);
1159 btrfs_dev_replace_stats_inc(
1160 &sctx->dev_root->fs_info->
1161 dev_replace.num_write_errors);
1169 * for regular scrub, repair those pages that are errored.
1170 * In case of I/O errors in the area that is supposed to be
1171 * repaired, continue by picking good copies of those pages.
1172 * Select the good pages from mirrors to rewrite bad pages from
1173 * the area to fix. Afterwards verify the checksum of the block
1174 * that is supposed to be repaired. This verification step is
1175 * only done for the purpose of statistic counting and for the
1176 * final scrub report, whether errors remain.
1177 * A perfect algorithm could make use of the checksum and try
1178 * all possible combinations of pages from the different mirrors
1179 * until the checksum verification succeeds. For example, when
1180 * the 2nd page of mirror #1 faces I/O errors, and the 2nd page
1181 * of mirror #2 is readable but the final checksum test fails,
1182 * then the 2nd page of mirror #3 could be tried, whether now
1183 * the final checksum succeedes. But this would be a rare
1184 * exception and is therefore not implemented. At least it is
1185 * avoided that the good copy is overwritten.
1186 * A more useful improvement would be to pick the sectors
1187 * without I/O error based on sector sizes (512 bytes on legacy
1188 * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one
1189 * mirror could be repaired by taking 512 byte of a different
1190 * mirror, even if other 512 byte sectors in the same PAGE_SIZE
1191 * area are unreadable.
1194 /* can only fix I/O errors from here on */
1195 if (sblock_bad->no_io_error_seen)
1196 goto did_not_correct_error;
1199 for (page_num = 0; page_num < sblock_bad->page_count; page_num++) {
1200 struct scrub_page *page_bad = sblock_bad->pagev[page_num];
1202 if (!page_bad->io_error)
1205 for (mirror_index = 0;
1206 mirror_index < BTRFS_MAX_MIRRORS &&
1207 sblocks_for_recheck[mirror_index].page_count > 0;
1209 struct scrub_block *sblock_other = sblocks_for_recheck +
1211 struct scrub_page *page_other = sblock_other->pagev[
1214 if (!page_other->io_error) {
1215 ret = scrub_repair_page_from_good_copy(
1216 sblock_bad, sblock_other, page_num, 0);
1218 page_bad->io_error = 0;
1219 break; /* succeeded for this page */
1224 if (page_bad->io_error) {
1225 /* did not find a mirror to copy the page from */
1231 if (is_metadata || have_csum) {
1233 * need to verify the checksum now that all
1234 * sectors on disk are repaired (the write
1235 * request for data to be repaired is on its way).
1236 * Just be lazy and use scrub_recheck_block()
1237 * which re-reads the data before the checksum
1238 * is verified, but most likely the data comes out
1239 * of the page cache.
1241 scrub_recheck_block(fs_info, sblock_bad,
1242 is_metadata, have_csum, csum,
1243 generation, sctx->csum_size, 1);
1244 if (!sblock_bad->header_error &&
1245 !sblock_bad->checksum_error &&
1246 sblock_bad->no_io_error_seen)
1247 goto corrected_error;
1249 goto did_not_correct_error;
1252 spin_lock(&sctx->stat_lock);
1253 sctx->stat.corrected_errors++;
1254 sblock_to_check->data_corrected = 1;
1255 spin_unlock(&sctx->stat_lock);
1256 printk_ratelimited_in_rcu(KERN_ERR
1257 "BTRFS: fixed up error at logical %llu on dev %s\n",
1258 logical, rcu_str_deref(dev->name));
1261 did_not_correct_error:
1262 spin_lock(&sctx->stat_lock);
1263 sctx->stat.uncorrectable_errors++;
1264 spin_unlock(&sctx->stat_lock);
1265 printk_ratelimited_in_rcu(KERN_ERR
1266 "BTRFS: unable to fixup (regular) error at logical %llu on dev %s\n",
1267 logical, rcu_str_deref(dev->name));
1271 if (sblocks_for_recheck) {
1272 for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS;
1274 struct scrub_block *sblock = sblocks_for_recheck +
1276 struct scrub_recover *recover;
1279 for (page_index = 0; page_index < sblock->page_count;
1281 sblock->pagev[page_index]->sblock = NULL;
1282 recover = sblock->pagev[page_index]->recover;
1284 scrub_put_recover(recover);
1285 sblock->pagev[page_index]->recover =
1288 scrub_page_put(sblock->pagev[page_index]);
1291 kfree(sblocks_for_recheck);
1297 static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio)
1299 if (bbio->raid_map) {
1300 int real_stripes = bbio->num_stripes - bbio->num_tgtdevs;
1302 if (bbio->raid_map[real_stripes - 1] == RAID6_Q_STRIPE)
1307 return (int)bbio->num_stripes;
1311 static inline void scrub_stripe_index_and_offset(u64 logical, u64 *raid_map,
1313 int nstripes, int mirror,
1321 for (i = 0; i < nstripes; i++) {
1322 if (raid_map[i] == RAID6_Q_STRIPE ||
1323 raid_map[i] == RAID5_P_STRIPE)
1326 if (logical >= raid_map[i] &&
1327 logical < raid_map[i] + mapped_length)
1332 *stripe_offset = logical - raid_map[i];
1334 /* The other RAID type */
1335 *stripe_index = mirror;
1340 static int scrub_setup_recheck_block(struct scrub_ctx *sctx,
1341 struct btrfs_fs_info *fs_info,
1342 struct scrub_block *original_sblock,
1343 u64 length, u64 logical,
1344 struct scrub_block *sblocks_for_recheck)
1346 struct scrub_recover *recover;
1347 struct btrfs_bio *bbio;
1358 * note: the two members ref_count and outstanding_pages
1359 * are not used (and not set) in the blocks that are used for
1360 * the recheck procedure
1364 while (length > 0) {
1365 sublen = min_t(u64, length, PAGE_SIZE);
1366 mapped_length = sublen;
1370 * with a length of PAGE_SIZE, each returned stripe
1371 * represents one mirror
1373 ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical,
1374 &mapped_length, &bbio, 0, 1);
1375 if (ret || !bbio || mapped_length < sublen) {
1376 btrfs_put_bbio(bbio);
1380 recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS);
1382 btrfs_put_bbio(bbio);
1386 atomic_set(&recover->refs, 1);
1387 recover->bbio = bbio;
1388 recover->map_length = mapped_length;
1390 BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO);
1392 nmirrors = scrub_nr_raid_mirrors(bbio);
1393 for (mirror_index = 0; mirror_index < nmirrors;
1395 struct scrub_block *sblock;
1396 struct scrub_page *page;
1398 if (mirror_index >= BTRFS_MAX_MIRRORS)
1401 sblock = sblocks_for_recheck + mirror_index;
1402 sblock->sctx = sctx;
1403 page = kzalloc(sizeof(*page), GFP_NOFS);
1406 spin_lock(&sctx->stat_lock);
1407 sctx->stat.malloc_errors++;
1408 spin_unlock(&sctx->stat_lock);
1409 scrub_put_recover(recover);
1412 scrub_page_get(page);
1413 sblock->pagev[page_index] = page;
1414 page->logical = logical;
1416 scrub_stripe_index_and_offset(logical, bbio->raid_map,
1423 page->physical = bbio->stripes[stripe_index].physical +
1425 page->dev = bbio->stripes[stripe_index].dev;
1427 BUG_ON(page_index >= original_sblock->page_count);
1428 page->physical_for_dev_replace =
1429 original_sblock->pagev[page_index]->
1430 physical_for_dev_replace;
1431 /* for missing devices, dev->bdev is NULL */
1432 page->mirror_num = mirror_index + 1;
1433 sblock->page_count++;
1434 page->page = alloc_page(GFP_NOFS);
1438 scrub_get_recover(recover);
1439 page->recover = recover;
1441 scrub_put_recover(recover);
1450 struct scrub_bio_ret {
1451 struct completion event;
1455 static void scrub_bio_wait_endio(struct bio *bio, int error)
1457 struct scrub_bio_ret *ret = bio->bi_private;
1460 complete(&ret->event);
1463 static inline int scrub_is_page_on_raid56(struct scrub_page *page)
1465 return page->recover && page->recover->bbio->raid_map;
1468 static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info,
1470 struct scrub_page *page)
1472 struct scrub_bio_ret done;
1475 init_completion(&done.event);
1477 bio->bi_iter.bi_sector = page->logical >> 9;
1478 bio->bi_private = &done;
1479 bio->bi_end_io = scrub_bio_wait_endio;
1481 ret = raid56_parity_recover(fs_info->fs_root, bio, page->recover->bbio,
1482 page->recover->map_length,
1483 page->mirror_num, 0);
1487 wait_for_completion(&done.event);
1495 * this function will check the on disk data for checksum errors, header
1496 * errors and read I/O errors. If any I/O errors happen, the exact pages
1497 * which are errored are marked as being bad. The goal is to enable scrub
1498 * to take those pages that are not errored from all the mirrors so that
1499 * the pages that are errored in the just handled mirror can be repaired.
1501 static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
1502 struct scrub_block *sblock, int is_metadata,
1503 int have_csum, u8 *csum, u64 generation,
1504 u16 csum_size, int retry_failed_mirror)
1508 sblock->no_io_error_seen = 1;
1509 sblock->header_error = 0;
1510 sblock->checksum_error = 0;
1512 for (page_num = 0; page_num < sblock->page_count; page_num++) {
1514 struct scrub_page *page = sblock->pagev[page_num];
1516 if (page->dev->bdev == NULL) {
1518 sblock->no_io_error_seen = 0;
1522 WARN_ON(!page->page);
1523 bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
1526 sblock->no_io_error_seen = 0;
1529 bio->bi_bdev = page->dev->bdev;
1531 bio_add_page(bio, page->page, PAGE_SIZE, 0);
1532 if (!retry_failed_mirror && scrub_is_page_on_raid56(page)) {
1533 if (scrub_submit_raid56_bio_wait(fs_info, bio, page))
1534 sblock->no_io_error_seen = 0;
1536 bio->bi_iter.bi_sector = page->physical >> 9;
1538 if (btrfsic_submit_bio_wait(READ, bio))
1539 sblock->no_io_error_seen = 0;
1545 if (sblock->no_io_error_seen)
1546 scrub_recheck_block_checksum(fs_info, sblock, is_metadata,
1547 have_csum, csum, generation,
1553 static inline int scrub_check_fsid(u8 fsid[],
1554 struct scrub_page *spage)
1556 struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices;
1559 ret = memcmp(fsid, fs_devices->fsid, BTRFS_UUID_SIZE);
1563 static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info,
1564 struct scrub_block *sblock,
1565 int is_metadata, int have_csum,
1566 const u8 *csum, u64 generation,
1570 u8 calculated_csum[BTRFS_CSUM_SIZE];
1572 void *mapped_buffer;
1574 WARN_ON(!sblock->pagev[0]->page);
1576 struct btrfs_header *h;
1578 mapped_buffer = kmap_atomic(sblock->pagev[0]->page);
1579 h = (struct btrfs_header *)mapped_buffer;
1581 if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h) ||
1582 !scrub_check_fsid(h->fsid, sblock->pagev[0]) ||
1583 memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
1585 sblock->header_error = 1;
1586 } else if (generation != btrfs_stack_header_generation(h)) {
1587 sblock->header_error = 1;
1588 sblock->generation_error = 1;
1595 mapped_buffer = kmap_atomic(sblock->pagev[0]->page);
1598 for (page_num = 0;;) {
1599 if (page_num == 0 && is_metadata)
1600 crc = btrfs_csum_data(
1601 ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE,
1602 crc, PAGE_SIZE - BTRFS_CSUM_SIZE);
1604 crc = btrfs_csum_data(mapped_buffer, crc, PAGE_SIZE);
1606 kunmap_atomic(mapped_buffer);
1608 if (page_num >= sblock->page_count)
1610 WARN_ON(!sblock->pagev[page_num]->page);
1612 mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page);
1615 btrfs_csum_final(crc, calculated_csum);
1616 if (memcmp(calculated_csum, csum, csum_size))
1617 sblock->checksum_error = 1;
1620 static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
1621 struct scrub_block *sblock_good,
1627 for (page_num = 0; page_num < sblock_bad->page_count; page_num++) {
1630 ret_sub = scrub_repair_page_from_good_copy(sblock_bad,
1641 static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
1642 struct scrub_block *sblock_good,
1643 int page_num, int force_write)
1645 struct scrub_page *page_bad = sblock_bad->pagev[page_num];
1646 struct scrub_page *page_good = sblock_good->pagev[page_num];
1648 BUG_ON(page_bad->page == NULL);
1649 BUG_ON(page_good->page == NULL);
1650 if (force_write || sblock_bad->header_error ||
1651 sblock_bad->checksum_error || page_bad->io_error) {
1655 if (!page_bad->dev->bdev) {
1656 printk_ratelimited(KERN_WARNING "BTRFS: "
1657 "scrub_repair_page_from_good_copy(bdev == NULL) "
1658 "is unexpected!\n");
1662 bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
1665 bio->bi_bdev = page_bad->dev->bdev;
1666 bio->bi_iter.bi_sector = page_bad->physical >> 9;
1668 ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0);
1669 if (PAGE_SIZE != ret) {
1674 if (btrfsic_submit_bio_wait(WRITE, bio)) {
1675 btrfs_dev_stat_inc_and_print(page_bad->dev,
1676 BTRFS_DEV_STAT_WRITE_ERRS);
1677 btrfs_dev_replace_stats_inc(
1678 &sblock_bad->sctx->dev_root->fs_info->
1679 dev_replace.num_write_errors);
1689 static void scrub_write_block_to_dev_replace(struct scrub_block *sblock)
1694 * This block is used for the check of the parity on the source device,
1695 * so the data needn't be written into the destination device.
1697 if (sblock->sparity)
1700 for (page_num = 0; page_num < sblock->page_count; page_num++) {
1703 ret = scrub_write_page_to_dev_replace(sblock, page_num);
1705 btrfs_dev_replace_stats_inc(
1706 &sblock->sctx->dev_root->fs_info->dev_replace.
1711 static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
1714 struct scrub_page *spage = sblock->pagev[page_num];
1716 BUG_ON(spage->page == NULL);
1717 if (spage->io_error) {
1718 void *mapped_buffer = kmap_atomic(spage->page);
1720 memset(mapped_buffer, 0, PAGE_CACHE_SIZE);
1721 flush_dcache_page(spage->page);
1722 kunmap_atomic(mapped_buffer);
1724 return scrub_add_page_to_wr_bio(sblock->sctx, spage);
1727 static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
1728 struct scrub_page *spage)
1730 struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx;
1731 struct scrub_bio *sbio;
1734 mutex_lock(&wr_ctx->wr_lock);
1736 if (!wr_ctx->wr_curr_bio) {
1737 wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio),
1739 if (!wr_ctx->wr_curr_bio) {
1740 mutex_unlock(&wr_ctx->wr_lock);
1743 wr_ctx->wr_curr_bio->sctx = sctx;
1744 wr_ctx->wr_curr_bio->page_count = 0;
1746 sbio = wr_ctx->wr_curr_bio;
1747 if (sbio->page_count == 0) {
1750 sbio->physical = spage->physical_for_dev_replace;
1751 sbio->logical = spage->logical;
1752 sbio->dev = wr_ctx->tgtdev;
1755 bio = btrfs_io_bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio);
1757 mutex_unlock(&wr_ctx->wr_lock);
1763 bio->bi_private = sbio;
1764 bio->bi_end_io = scrub_wr_bio_end_io;
1765 bio->bi_bdev = sbio->dev->bdev;
1766 bio->bi_iter.bi_sector = sbio->physical >> 9;
1768 } else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
1769 spage->physical_for_dev_replace ||
1770 sbio->logical + sbio->page_count * PAGE_SIZE !=
1772 scrub_wr_submit(sctx);
1776 ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
1777 if (ret != PAGE_SIZE) {
1778 if (sbio->page_count < 1) {
1781 mutex_unlock(&wr_ctx->wr_lock);
1784 scrub_wr_submit(sctx);
1788 sbio->pagev[sbio->page_count] = spage;
1789 scrub_page_get(spage);
1791 if (sbio->page_count == wr_ctx->pages_per_wr_bio)
1792 scrub_wr_submit(sctx);
1793 mutex_unlock(&wr_ctx->wr_lock);
1798 static void scrub_wr_submit(struct scrub_ctx *sctx)
1800 struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx;
1801 struct scrub_bio *sbio;
1803 if (!wr_ctx->wr_curr_bio)
1806 sbio = wr_ctx->wr_curr_bio;
1807 wr_ctx->wr_curr_bio = NULL;
1808 WARN_ON(!sbio->bio->bi_bdev);
1809 scrub_pending_bio_inc(sctx);
1810 /* process all writes in a single worker thread. Then the block layer
1811 * orders the requests before sending them to the driver which
1812 * doubled the write performance on spinning disks when measured
1814 btrfsic_submit_bio(WRITE, sbio->bio);
1817 static void scrub_wr_bio_end_io(struct bio *bio, int err)
1819 struct scrub_bio *sbio = bio->bi_private;
1820 struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
1825 btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper,
1826 scrub_wr_bio_end_io_worker, NULL, NULL);
1827 btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work);
1830 static void scrub_wr_bio_end_io_worker(struct btrfs_work *work)
1832 struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
1833 struct scrub_ctx *sctx = sbio->sctx;
1836 WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO);
1838 struct btrfs_dev_replace *dev_replace =
1839 &sbio->sctx->dev_root->fs_info->dev_replace;
1841 for (i = 0; i < sbio->page_count; i++) {
1842 struct scrub_page *spage = sbio->pagev[i];
1844 spage->io_error = 1;
1845 btrfs_dev_replace_stats_inc(&dev_replace->
1850 for (i = 0; i < sbio->page_count; i++)
1851 scrub_page_put(sbio->pagev[i]);
1855 scrub_pending_bio_dec(sctx);
1858 static int scrub_checksum(struct scrub_block *sblock)
1863 WARN_ON(sblock->page_count < 1);
1864 flags = sblock->pagev[0]->flags;
1866 if (flags & BTRFS_EXTENT_FLAG_DATA)
1867 ret = scrub_checksum_data(sblock);
1868 else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)
1869 ret = scrub_checksum_tree_block(sblock);
1870 else if (flags & BTRFS_EXTENT_FLAG_SUPER)
1871 (void)scrub_checksum_super(sblock);
1875 scrub_handle_errored_block(sblock);
1880 static int scrub_checksum_data(struct scrub_block *sblock)
1882 struct scrub_ctx *sctx = sblock->sctx;
1883 u8 csum[BTRFS_CSUM_SIZE];
1892 BUG_ON(sblock->page_count < 1);
1893 if (!sblock->pagev[0]->have_csum)
1896 on_disk_csum = sblock->pagev[0]->csum;
1897 page = sblock->pagev[0]->page;
1898 buffer = kmap_atomic(page);
1900 len = sctx->sectorsize;
1903 u64 l = min_t(u64, len, PAGE_SIZE);
1905 crc = btrfs_csum_data(buffer, crc, l);
1906 kunmap_atomic(buffer);
1911 BUG_ON(index >= sblock->page_count);
1912 BUG_ON(!sblock->pagev[index]->page);
1913 page = sblock->pagev[index]->page;
1914 buffer = kmap_atomic(page);
1917 btrfs_csum_final(crc, csum);
1918 if (memcmp(csum, on_disk_csum, sctx->csum_size))
1924 static int scrub_checksum_tree_block(struct scrub_block *sblock)
1926 struct scrub_ctx *sctx = sblock->sctx;
1927 struct btrfs_header *h;
1928 struct btrfs_root *root = sctx->dev_root;
1929 struct btrfs_fs_info *fs_info = root->fs_info;
1930 u8 calculated_csum[BTRFS_CSUM_SIZE];
1931 u8 on_disk_csum[BTRFS_CSUM_SIZE];
1933 void *mapped_buffer;
1942 BUG_ON(sblock->page_count < 1);
1943 page = sblock->pagev[0]->page;
1944 mapped_buffer = kmap_atomic(page);
1945 h = (struct btrfs_header *)mapped_buffer;
1946 memcpy(on_disk_csum, h->csum, sctx->csum_size);
1949 * we don't use the getter functions here, as we
1950 * a) don't have an extent buffer and
1951 * b) the page is already kmapped
1954 if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h))
1957 if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h))
1960 if (!scrub_check_fsid(h->fsid, sblock->pagev[0]))
1963 if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
1967 len = sctx->nodesize - BTRFS_CSUM_SIZE;
1968 mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
1969 p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE;
1972 u64 l = min_t(u64, len, mapped_size);
1974 crc = btrfs_csum_data(p, crc, l);
1975 kunmap_atomic(mapped_buffer);
1980 BUG_ON(index >= sblock->page_count);
1981 BUG_ON(!sblock->pagev[index]->page);
1982 page = sblock->pagev[index]->page;
1983 mapped_buffer = kmap_atomic(page);
1984 mapped_size = PAGE_SIZE;
1988 btrfs_csum_final(crc, calculated_csum);
1989 if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
1992 return fail || crc_fail;
1995 static int scrub_checksum_super(struct scrub_block *sblock)
1997 struct btrfs_super_block *s;
1998 struct scrub_ctx *sctx = sblock->sctx;
1999 u8 calculated_csum[BTRFS_CSUM_SIZE];
2000 u8 on_disk_csum[BTRFS_CSUM_SIZE];
2002 void *mapped_buffer;
2011 BUG_ON(sblock->page_count < 1);
2012 page = sblock->pagev[0]->page;
2013 mapped_buffer = kmap_atomic(page);
2014 s = (struct btrfs_super_block *)mapped_buffer;
2015 memcpy(on_disk_csum, s->csum, sctx->csum_size);
2017 if (sblock->pagev[0]->logical != btrfs_super_bytenr(s))
2020 if (sblock->pagev[0]->generation != btrfs_super_generation(s))
2023 if (!scrub_check_fsid(s->fsid, sblock->pagev[0]))
2026 len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE;
2027 mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
2028 p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE;
2031 u64 l = min_t(u64, len, mapped_size);
2033 crc = btrfs_csum_data(p, crc, l);
2034 kunmap_atomic(mapped_buffer);
2039 BUG_ON(index >= sblock->page_count);
2040 BUG_ON(!sblock->pagev[index]->page);
2041 page = sblock->pagev[index]->page;
2042 mapped_buffer = kmap_atomic(page);
2043 mapped_size = PAGE_SIZE;
2047 btrfs_csum_final(crc, calculated_csum);
2048 if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
2051 if (fail_cor + fail_gen) {
2053 * if we find an error in a super block, we just report it.
2054 * They will get written with the next transaction commit
2057 spin_lock(&sctx->stat_lock);
2058 ++sctx->stat.super_errors;
2059 spin_unlock(&sctx->stat_lock);
2061 btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev,
2062 BTRFS_DEV_STAT_CORRUPTION_ERRS);
2064 btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev,
2065 BTRFS_DEV_STAT_GENERATION_ERRS);
2068 return fail_cor + fail_gen;
2071 static void scrub_block_get(struct scrub_block *sblock)
2073 atomic_inc(&sblock->ref_count);
2076 static void scrub_block_put(struct scrub_block *sblock)
2078 if (atomic_dec_and_test(&sblock->ref_count)) {
2081 if (sblock->sparity)
2082 scrub_parity_put(sblock->sparity);
2084 for (i = 0; i < sblock->page_count; i++)
2085 scrub_page_put(sblock->pagev[i]);
2090 static void scrub_page_get(struct scrub_page *spage)
2092 atomic_inc(&spage->ref_count);
2095 static void scrub_page_put(struct scrub_page *spage)
2097 if (atomic_dec_and_test(&spage->ref_count)) {
2099 __free_page(spage->page);
2104 static void scrub_submit(struct scrub_ctx *sctx)
2106 struct scrub_bio *sbio;
2108 if (sctx->curr == -1)
2111 sbio = sctx->bios[sctx->curr];
2113 scrub_pending_bio_inc(sctx);
2115 if (!sbio->bio->bi_bdev) {
2117 * this case should not happen. If btrfs_map_block() is
2118 * wrong, it could happen for dev-replace operations on
2119 * missing devices when no mirrors are available, but in
2120 * this case it should already fail the mount.
2121 * This case is handled correctly (but _very_ slowly).
2123 printk_ratelimited(KERN_WARNING
2124 "BTRFS: scrub_submit(bio bdev == NULL) is unexpected!\n");
2125 bio_endio(sbio->bio, -EIO);
2127 btrfsic_submit_bio(READ, sbio->bio);
2131 static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
2132 struct scrub_page *spage)
2134 struct scrub_block *sblock = spage->sblock;
2135 struct scrub_bio *sbio;
2140 * grab a fresh bio or wait for one to become available
2142 while (sctx->curr == -1) {
2143 spin_lock(&sctx->list_lock);
2144 sctx->curr = sctx->first_free;
2145 if (sctx->curr != -1) {
2146 sctx->first_free = sctx->bios[sctx->curr]->next_free;
2147 sctx->bios[sctx->curr]->next_free = -1;
2148 sctx->bios[sctx->curr]->page_count = 0;
2149 spin_unlock(&sctx->list_lock);
2151 spin_unlock(&sctx->list_lock);
2152 wait_event(sctx->list_wait, sctx->first_free != -1);
2155 sbio = sctx->bios[sctx->curr];
2156 if (sbio->page_count == 0) {
2159 sbio->physical = spage->physical;
2160 sbio->logical = spage->logical;
2161 sbio->dev = spage->dev;
2164 bio = btrfs_io_bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio);
2170 bio->bi_private = sbio;
2171 bio->bi_end_io = scrub_bio_end_io;
2172 bio->bi_bdev = sbio->dev->bdev;
2173 bio->bi_iter.bi_sector = sbio->physical >> 9;
2175 } else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
2177 sbio->logical + sbio->page_count * PAGE_SIZE !=
2179 sbio->dev != spage->dev) {
2184 sbio->pagev[sbio->page_count] = spage;
2185 ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
2186 if (ret != PAGE_SIZE) {
2187 if (sbio->page_count < 1) {
2196 scrub_block_get(sblock); /* one for the page added to the bio */
2197 atomic_inc(&sblock->outstanding_pages);
2199 if (sbio->page_count == sctx->pages_per_rd_bio)
2205 static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
2206 u64 physical, struct btrfs_device *dev, u64 flags,
2207 u64 gen, int mirror_num, u8 *csum, int force,
2208 u64 physical_for_dev_replace)
2210 struct scrub_block *sblock;
2213 sblock = kzalloc(sizeof(*sblock), GFP_NOFS);
2215 spin_lock(&sctx->stat_lock);
2216 sctx->stat.malloc_errors++;
2217 spin_unlock(&sctx->stat_lock);
2221 /* one ref inside this function, plus one for each page added to
2223 atomic_set(&sblock->ref_count, 1);
2224 sblock->sctx = sctx;
2225 sblock->no_io_error_seen = 1;
2227 for (index = 0; len > 0; index++) {
2228 struct scrub_page *spage;
2229 u64 l = min_t(u64, len, PAGE_SIZE);
2231 spage = kzalloc(sizeof(*spage), GFP_NOFS);
2234 spin_lock(&sctx->stat_lock);
2235 sctx->stat.malloc_errors++;
2236 spin_unlock(&sctx->stat_lock);
2237 scrub_block_put(sblock);
2240 BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
2241 scrub_page_get(spage);
2242 sblock->pagev[index] = spage;
2243 spage->sblock = sblock;
2245 spage->flags = flags;
2246 spage->generation = gen;
2247 spage->logical = logical;
2248 spage->physical = physical;
2249 spage->physical_for_dev_replace = physical_for_dev_replace;
2250 spage->mirror_num = mirror_num;
2252 spage->have_csum = 1;
2253 memcpy(spage->csum, csum, sctx->csum_size);
2255 spage->have_csum = 0;
2257 sblock->page_count++;
2258 spage->page = alloc_page(GFP_NOFS);
2264 physical_for_dev_replace += l;
2267 WARN_ON(sblock->page_count == 0);
2268 for (index = 0; index < sblock->page_count; index++) {
2269 struct scrub_page *spage = sblock->pagev[index];
2272 ret = scrub_add_page_to_rd_bio(sctx, spage);
2274 scrub_block_put(sblock);
2282 /* last one frees, either here or in bio completion for last page */
2283 scrub_block_put(sblock);
2287 static void scrub_bio_end_io(struct bio *bio, int err)
2289 struct scrub_bio *sbio = bio->bi_private;
2290 struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
2295 btrfs_queue_work(fs_info->scrub_workers, &sbio->work);
2298 static void scrub_bio_end_io_worker(struct btrfs_work *work)
2300 struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
2301 struct scrub_ctx *sctx = sbio->sctx;
2304 BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO);
2306 for (i = 0; i < sbio->page_count; i++) {
2307 struct scrub_page *spage = sbio->pagev[i];
2309 spage->io_error = 1;
2310 spage->sblock->no_io_error_seen = 0;
2314 /* now complete the scrub_block items that have all pages completed */
2315 for (i = 0; i < sbio->page_count; i++) {
2316 struct scrub_page *spage = sbio->pagev[i];
2317 struct scrub_block *sblock = spage->sblock;
2319 if (atomic_dec_and_test(&sblock->outstanding_pages))
2320 scrub_block_complete(sblock);
2321 scrub_block_put(sblock);
2326 spin_lock(&sctx->list_lock);
2327 sbio->next_free = sctx->first_free;
2328 sctx->first_free = sbio->index;
2329 spin_unlock(&sctx->list_lock);
2331 if (sctx->is_dev_replace &&
2332 atomic_read(&sctx->wr_ctx.flush_all_writes)) {
2333 mutex_lock(&sctx->wr_ctx.wr_lock);
2334 scrub_wr_submit(sctx);
2335 mutex_unlock(&sctx->wr_ctx.wr_lock);
2338 scrub_pending_bio_dec(sctx);
2341 static inline void __scrub_mark_bitmap(struct scrub_parity *sparity,
2342 unsigned long *bitmap,
2347 int sectorsize = sparity->sctx->dev_root->sectorsize;
2349 if (len >= sparity->stripe_len) {
2350 bitmap_set(bitmap, 0, sparity->nsectors);
2354 start -= sparity->logic_start;
2355 offset = (int)do_div(start, sparity->stripe_len);
2356 offset /= sectorsize;
2357 nsectors = (int)len / sectorsize;
2359 if (offset + nsectors <= sparity->nsectors) {
2360 bitmap_set(bitmap, offset, nsectors);
2364 bitmap_set(bitmap, offset, sparity->nsectors - offset);
2365 bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset));
2368 static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity,
2371 __scrub_mark_bitmap(sparity, sparity->ebitmap, start, len);
2374 static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity,
2377 __scrub_mark_bitmap(sparity, sparity->dbitmap, start, len);
2380 static void scrub_block_complete(struct scrub_block *sblock)
2384 if (!sblock->no_io_error_seen) {
2386 scrub_handle_errored_block(sblock);
2389 * if has checksum error, write via repair mechanism in
2390 * dev replace case, otherwise write here in dev replace
2393 corrupted = scrub_checksum(sblock);
2394 if (!corrupted && sblock->sctx->is_dev_replace)
2395 scrub_write_block_to_dev_replace(sblock);
2398 if (sblock->sparity && corrupted && !sblock->data_corrected) {
2399 u64 start = sblock->pagev[0]->logical;
2400 u64 end = sblock->pagev[sblock->page_count - 1]->logical +
2403 scrub_parity_mark_sectors_error(sblock->sparity,
2404 start, end - start);
2408 static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len,
2411 struct btrfs_ordered_sum *sum = NULL;
2412 unsigned long index;
2413 unsigned long num_sectors;
2415 while (!list_empty(&sctx->csum_list)) {
2416 sum = list_first_entry(&sctx->csum_list,
2417 struct btrfs_ordered_sum, list);
2418 if (sum->bytenr > logical)
2420 if (sum->bytenr + sum->len > logical)
2423 ++sctx->stat.csum_discards;
2424 list_del(&sum->list);
2431 index = ((u32)(logical - sum->bytenr)) / sctx->sectorsize;
2432 num_sectors = sum->len / sctx->sectorsize;
2433 memcpy(csum, sum->sums + index, sctx->csum_size);
2434 if (index == num_sectors - 1) {
2435 list_del(&sum->list);
2441 /* scrub extent tries to collect up to 64 kB for each bio */
2442 static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len,
2443 u64 physical, struct btrfs_device *dev, u64 flags,
2444 u64 gen, int mirror_num, u64 physical_for_dev_replace)
2447 u8 csum[BTRFS_CSUM_SIZE];
2450 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2451 blocksize = sctx->sectorsize;
2452 spin_lock(&sctx->stat_lock);
2453 sctx->stat.data_extents_scrubbed++;
2454 sctx->stat.data_bytes_scrubbed += len;
2455 spin_unlock(&sctx->stat_lock);
2456 } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
2457 blocksize = sctx->nodesize;
2458 spin_lock(&sctx->stat_lock);
2459 sctx->stat.tree_extents_scrubbed++;
2460 sctx->stat.tree_bytes_scrubbed += len;
2461 spin_unlock(&sctx->stat_lock);
2463 blocksize = sctx->sectorsize;
2468 u64 l = min_t(u64, len, blocksize);
2471 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2472 /* push csums to sbio */
2473 have_csum = scrub_find_csum(sctx, logical, l, csum);
2475 ++sctx->stat.no_csum;
2476 if (sctx->is_dev_replace && !have_csum) {
2477 ret = copy_nocow_pages(sctx, logical, l,
2479 physical_for_dev_replace);
2480 goto behind_scrub_pages;
2483 ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen,
2484 mirror_num, have_csum ? csum : NULL, 0,
2485 physical_for_dev_replace);
2492 physical_for_dev_replace += l;
2497 static int scrub_pages_for_parity(struct scrub_parity *sparity,
2498 u64 logical, u64 len,
2499 u64 physical, struct btrfs_device *dev,
2500 u64 flags, u64 gen, int mirror_num, u8 *csum)
2502 struct scrub_ctx *sctx = sparity->sctx;
2503 struct scrub_block *sblock;
2506 sblock = kzalloc(sizeof(*sblock), GFP_NOFS);
2508 spin_lock(&sctx->stat_lock);
2509 sctx->stat.malloc_errors++;
2510 spin_unlock(&sctx->stat_lock);
2514 /* one ref inside this function, plus one for each page added to
2516 atomic_set(&sblock->ref_count, 1);
2517 sblock->sctx = sctx;
2518 sblock->no_io_error_seen = 1;
2519 sblock->sparity = sparity;
2520 scrub_parity_get(sparity);
2522 for (index = 0; len > 0; index++) {
2523 struct scrub_page *spage;
2524 u64 l = min_t(u64, len, PAGE_SIZE);
2526 spage = kzalloc(sizeof(*spage), GFP_NOFS);
2529 spin_lock(&sctx->stat_lock);
2530 sctx->stat.malloc_errors++;
2531 spin_unlock(&sctx->stat_lock);
2532 scrub_block_put(sblock);
2535 BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
2536 /* For scrub block */
2537 scrub_page_get(spage);
2538 sblock->pagev[index] = spage;
2539 /* For scrub parity */
2540 scrub_page_get(spage);
2541 list_add_tail(&spage->list, &sparity->spages);
2542 spage->sblock = sblock;
2544 spage->flags = flags;
2545 spage->generation = gen;
2546 spage->logical = logical;
2547 spage->physical = physical;
2548 spage->mirror_num = mirror_num;
2550 spage->have_csum = 1;
2551 memcpy(spage->csum, csum, sctx->csum_size);
2553 spage->have_csum = 0;
2555 sblock->page_count++;
2556 spage->page = alloc_page(GFP_NOFS);
2564 WARN_ON(sblock->page_count == 0);
2565 for (index = 0; index < sblock->page_count; index++) {
2566 struct scrub_page *spage = sblock->pagev[index];
2569 ret = scrub_add_page_to_rd_bio(sctx, spage);
2571 scrub_block_put(sblock);
2576 /* last one frees, either here or in bio completion for last page */
2577 scrub_block_put(sblock);
2581 static int scrub_extent_for_parity(struct scrub_parity *sparity,
2582 u64 logical, u64 len,
2583 u64 physical, struct btrfs_device *dev,
2584 u64 flags, u64 gen, int mirror_num)
2586 struct scrub_ctx *sctx = sparity->sctx;
2588 u8 csum[BTRFS_CSUM_SIZE];
2591 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2592 blocksize = sctx->sectorsize;
2593 } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
2594 blocksize = sctx->nodesize;
2596 blocksize = sctx->sectorsize;
2601 u64 l = min_t(u64, len, blocksize);
2604 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2605 /* push csums to sbio */
2606 have_csum = scrub_find_csum(sctx, logical, l, csum);
2610 ret = scrub_pages_for_parity(sparity, logical, l, physical, dev,
2611 flags, gen, mirror_num,
2612 have_csum ? csum : NULL);
2624 * Given a physical address, this will calculate it's
2625 * logical offset. if this is a parity stripe, it will return
2626 * the most left data stripe's logical offset.
2628 * return 0 if it is a data stripe, 1 means parity stripe.
2630 static int get_raid56_logic_offset(u64 physical, int num,
2631 struct map_lookup *map, u64 *offset,
2641 last_offset = (physical - map->stripes[num].physical) *
2642 nr_data_stripes(map);
2644 *stripe_start = last_offset;
2646 *offset = last_offset;
2647 for (i = 0; i < nr_data_stripes(map); i++) {
2648 *offset = last_offset + i * map->stripe_len;
2650 stripe_nr = *offset;
2651 do_div(stripe_nr, map->stripe_len);
2652 do_div(stripe_nr, nr_data_stripes(map));
2654 /* Work out the disk rotation on this stripe-set */
2655 rot = do_div(stripe_nr, map->num_stripes);
2656 /* calculate which stripe this data locates */
2658 stripe_index = rot % map->num_stripes;
2659 if (stripe_index == num)
2661 if (stripe_index < num)
2664 *offset = last_offset + j * map->stripe_len;
2668 static void scrub_free_parity(struct scrub_parity *sparity)
2670 struct scrub_ctx *sctx = sparity->sctx;
2671 struct scrub_page *curr, *next;
2674 nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors);
2676 spin_lock(&sctx->stat_lock);
2677 sctx->stat.read_errors += nbits;
2678 sctx->stat.uncorrectable_errors += nbits;
2679 spin_unlock(&sctx->stat_lock);
2682 list_for_each_entry_safe(curr, next, &sparity->spages, list) {
2683 list_del_init(&curr->list);
2684 scrub_page_put(curr);
2690 static void scrub_parity_bio_endio(struct bio *bio, int error)
2692 struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private;
2693 struct scrub_ctx *sctx = sparity->sctx;
2696 bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
2699 scrub_free_parity(sparity);
2700 scrub_pending_bio_dec(sctx);
2704 static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
2706 struct scrub_ctx *sctx = sparity->sctx;
2708 struct btrfs_raid_bio *rbio;
2709 struct scrub_page *spage;
2710 struct btrfs_bio *bbio = NULL;
2714 if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap,
2718 length = sparity->logic_end - sparity->logic_start + 1;
2719 ret = btrfs_map_sblock(sctx->dev_root->fs_info, WRITE,
2720 sparity->logic_start,
2721 &length, &bbio, 0, 1);
2722 if (ret || !bbio || !bbio->raid_map)
2725 bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
2729 bio->bi_iter.bi_sector = sparity->logic_start >> 9;
2730 bio->bi_private = sparity;
2731 bio->bi_end_io = scrub_parity_bio_endio;
2733 rbio = raid56_parity_alloc_scrub_rbio(sctx->dev_root, bio, bbio,
2734 length, sparity->scrub_dev,
2740 list_for_each_entry(spage, &sparity->spages, list)
2741 raid56_parity_add_scrub_pages(rbio, spage->page,
2744 scrub_pending_bio_inc(sctx);
2745 raid56_parity_submit_scrub_rbio(rbio);
2751 btrfs_put_bbio(bbio);
2752 bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
2754 spin_lock(&sctx->stat_lock);
2755 sctx->stat.malloc_errors++;
2756 spin_unlock(&sctx->stat_lock);
2758 scrub_free_parity(sparity);
2761 static inline int scrub_calc_parity_bitmap_len(int nsectors)
2763 return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * (BITS_PER_LONG / 8);
2766 static void scrub_parity_get(struct scrub_parity *sparity)
2768 atomic_inc(&sparity->ref_count);
2771 static void scrub_parity_put(struct scrub_parity *sparity)
2773 if (!atomic_dec_and_test(&sparity->ref_count))
2776 scrub_parity_check_and_repair(sparity);
2779 static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx,
2780 struct map_lookup *map,
2781 struct btrfs_device *sdev,
2782 struct btrfs_path *path,
2786 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
2787 struct btrfs_root *root = fs_info->extent_root;
2788 struct btrfs_root *csum_root = fs_info->csum_root;
2789 struct btrfs_extent_item *extent;
2793 struct extent_buffer *l;
2794 struct btrfs_key key;
2797 u64 extent_physical;
2799 struct btrfs_device *extent_dev;
2800 struct scrub_parity *sparity;
2803 int extent_mirror_num;
2806 nsectors = map->stripe_len / root->sectorsize;
2807 bitmap_len = scrub_calc_parity_bitmap_len(nsectors);
2808 sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len,
2811 spin_lock(&sctx->stat_lock);
2812 sctx->stat.malloc_errors++;
2813 spin_unlock(&sctx->stat_lock);
2817 sparity->stripe_len = map->stripe_len;
2818 sparity->nsectors = nsectors;
2819 sparity->sctx = sctx;
2820 sparity->scrub_dev = sdev;
2821 sparity->logic_start = logic_start;
2822 sparity->logic_end = logic_end;
2823 atomic_set(&sparity->ref_count, 1);
2824 INIT_LIST_HEAD(&sparity->spages);
2825 sparity->dbitmap = sparity->bitmap;
2826 sparity->ebitmap = (void *)sparity->bitmap + bitmap_len;
2829 while (logic_start < logic_end) {
2830 if (btrfs_fs_incompat(fs_info, SKINNY_METADATA))
2831 key.type = BTRFS_METADATA_ITEM_KEY;
2833 key.type = BTRFS_EXTENT_ITEM_KEY;
2834 key.objectid = logic_start;
2835 key.offset = (u64)-1;
2837 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2842 ret = btrfs_previous_extent_item(root, path, 0);
2846 btrfs_release_path(path);
2847 ret = btrfs_search_slot(NULL, root, &key,
2859 slot = path->slots[0];
2860 if (slot >= btrfs_header_nritems(l)) {
2861 ret = btrfs_next_leaf(root, path);
2870 btrfs_item_key_to_cpu(l, &key, slot);
2872 if (key.type == BTRFS_METADATA_ITEM_KEY)
2873 bytes = root->nodesize;
2877 if (key.objectid + bytes <= logic_start)
2880 if (key.type != BTRFS_EXTENT_ITEM_KEY &&
2881 key.type != BTRFS_METADATA_ITEM_KEY)
2884 if (key.objectid > logic_end) {
2889 while (key.objectid >= logic_start + map->stripe_len)
2890 logic_start += map->stripe_len;
2892 extent = btrfs_item_ptr(l, slot,
2893 struct btrfs_extent_item);
2894 flags = btrfs_extent_flags(l, extent);
2895 generation = btrfs_extent_generation(l, extent);
2897 if (key.objectid < logic_start &&
2898 (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) {
2900 "scrub: tree block %llu spanning stripes, ignored. logical=%llu",
2901 key.objectid, logic_start);
2905 extent_logical = key.objectid;
2908 if (extent_logical < logic_start) {
2909 extent_len -= logic_start - extent_logical;
2910 extent_logical = logic_start;
2913 if (extent_logical + extent_len >
2914 logic_start + map->stripe_len)
2915 extent_len = logic_start + map->stripe_len -
2918 scrub_parity_mark_sectors_data(sparity, extent_logical,
2921 scrub_remap_extent(fs_info, extent_logical,
2922 extent_len, &extent_physical,
2924 &extent_mirror_num);
2926 ret = btrfs_lookup_csums_range(csum_root,
2928 extent_logical + extent_len - 1,
2929 &sctx->csum_list, 1);
2933 ret = scrub_extent_for_parity(sparity, extent_logical,
2942 scrub_free_csums(sctx);
2943 if (extent_logical + extent_len <
2944 key.objectid + bytes) {
2945 logic_start += map->stripe_len;
2947 if (logic_start >= logic_end) {
2952 if (logic_start < key.objectid + bytes) {
2961 btrfs_release_path(path);
2966 logic_start += map->stripe_len;
2970 scrub_parity_mark_sectors_error(sparity, logic_start,
2971 logic_end - logic_start + 1);
2972 scrub_parity_put(sparity);
2974 mutex_lock(&sctx->wr_ctx.wr_lock);
2975 scrub_wr_submit(sctx);
2976 mutex_unlock(&sctx->wr_ctx.wr_lock);
2978 btrfs_release_path(path);
2979 return ret < 0 ? ret : 0;
2982 static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
2983 struct map_lookup *map,
2984 struct btrfs_device *scrub_dev,
2985 int num, u64 base, u64 length,
2988 struct btrfs_path *path, *ppath;
2989 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
2990 struct btrfs_root *root = fs_info->extent_root;
2991 struct btrfs_root *csum_root = fs_info->csum_root;
2992 struct btrfs_extent_item *extent;
2993 struct blk_plug plug;
2998 struct extent_buffer *l;
2999 struct btrfs_key key;
3006 struct reada_control *reada1;
3007 struct reada_control *reada2;
3008 struct btrfs_key key_start;
3009 struct btrfs_key key_end;
3010 u64 increment = map->stripe_len;
3013 u64 extent_physical;
3017 struct btrfs_device *extent_dev;
3018 int extent_mirror_num;
3022 physical = map->stripes[num].physical;
3024 do_div(nstripes, map->stripe_len);
3025 if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
3026 offset = map->stripe_len * num;
3027 increment = map->stripe_len * map->num_stripes;
3029 } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
3030 int factor = map->num_stripes / map->sub_stripes;
3031 offset = map->stripe_len * (num / map->sub_stripes);
3032 increment = map->stripe_len * factor;
3033 mirror_num = num % map->sub_stripes + 1;
3034 } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
3035 increment = map->stripe_len;
3036 mirror_num = num % map->num_stripes + 1;
3037 } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
3038 increment = map->stripe_len;
3039 mirror_num = num % map->num_stripes + 1;
3040 } else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
3041 BTRFS_BLOCK_GROUP_RAID6)) {
3042 get_raid56_logic_offset(physical, num, map, &offset, NULL);
3043 increment = map->stripe_len * nr_data_stripes(map);
3046 increment = map->stripe_len;
3050 path = btrfs_alloc_path();
3054 ppath = btrfs_alloc_path();
3056 btrfs_free_path(ppath);
3061 * work on commit root. The related disk blocks are static as
3062 * long as COW is applied. This means, it is save to rewrite
3063 * them to repair disk errors without any race conditions
3065 path->search_commit_root = 1;
3066 path->skip_locking = 1;
3069 * trigger the readahead for extent tree csum tree and wait for
3070 * completion. During readahead, the scrub is officially paused
3071 * to not hold off transaction commits
3073 logical = base + offset;
3074 physical_end = physical + nstripes * map->stripe_len;
3075 if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
3076 BTRFS_BLOCK_GROUP_RAID6)) {
3077 get_raid56_logic_offset(physical_end, num,
3078 map, &logic_end, NULL);
3081 logic_end = logical + increment * nstripes;
3083 wait_event(sctx->list_wait,
3084 atomic_read(&sctx->bios_in_flight) == 0);
3085 scrub_blocked_if_needed(fs_info);
3087 /* FIXME it might be better to start readahead at commit root */
3088 key_start.objectid = logical;
3089 key_start.type = BTRFS_EXTENT_ITEM_KEY;
3090 key_start.offset = (u64)0;
3091 key_end.objectid = logic_end;
3092 key_end.type = BTRFS_METADATA_ITEM_KEY;
3093 key_end.offset = (u64)-1;
3094 reada1 = btrfs_reada_add(root, &key_start, &key_end);
3096 key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
3097 key_start.type = BTRFS_EXTENT_CSUM_KEY;
3098 key_start.offset = logical;
3099 key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
3100 key_end.type = BTRFS_EXTENT_CSUM_KEY;
3101 key_end.offset = logic_end;
3102 reada2 = btrfs_reada_add(csum_root, &key_start, &key_end);
3104 if (!IS_ERR(reada1))
3105 btrfs_reada_wait(reada1);
3106 if (!IS_ERR(reada2))
3107 btrfs_reada_wait(reada2);
3111 * collect all data csums for the stripe to avoid seeking during
3112 * the scrub. This might currently (crc32) end up to be about 1MB
3114 blk_start_plug(&plug);
3117 * now find all extents for each stripe and scrub them
3120 while (physical < physical_end) {
3121 /* for raid56, we skip parity stripe */
3122 if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
3123 BTRFS_BLOCK_GROUP_RAID6)) {
3124 ret = get_raid56_logic_offset(physical, num,
3125 map, &logical, &stripe_logical);
3128 stripe_logical += base;
3129 stripe_end = stripe_logical + increment - 1;
3130 ret = scrub_raid56_parity(sctx, map, scrub_dev,
3131 ppath, stripe_logical,
3141 if (atomic_read(&fs_info->scrub_cancel_req) ||
3142 atomic_read(&sctx->cancel_req)) {
3147 * check to see if we have to pause
3149 if (atomic_read(&fs_info->scrub_pause_req)) {
3150 /* push queued extents */
3151 atomic_set(&sctx->wr_ctx.flush_all_writes, 1);
3153 mutex_lock(&sctx->wr_ctx.wr_lock);
3154 scrub_wr_submit(sctx);
3155 mutex_unlock(&sctx->wr_ctx.wr_lock);
3156 wait_event(sctx->list_wait,
3157 atomic_read(&sctx->bios_in_flight) == 0);
3158 atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
3159 scrub_blocked_if_needed(fs_info);
3162 if (btrfs_fs_incompat(fs_info, SKINNY_METADATA))
3163 key.type = BTRFS_METADATA_ITEM_KEY;
3165 key.type = BTRFS_EXTENT_ITEM_KEY;
3166 key.objectid = logical;
3167 key.offset = (u64)-1;
3169 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3174 ret = btrfs_previous_extent_item(root, path, 0);
3178 /* there's no smaller item, so stick with the
3180 btrfs_release_path(path);
3181 ret = btrfs_search_slot(NULL, root, &key,
3193 slot = path->slots[0];
3194 if (slot >= btrfs_header_nritems(l)) {
3195 ret = btrfs_next_leaf(root, path);
3204 btrfs_item_key_to_cpu(l, &key, slot);
3206 if (key.type == BTRFS_METADATA_ITEM_KEY)
3207 bytes = root->nodesize;
3211 if (key.objectid + bytes <= logical)
3214 if (key.type != BTRFS_EXTENT_ITEM_KEY &&
3215 key.type != BTRFS_METADATA_ITEM_KEY)
3218 if (key.objectid >= logical + map->stripe_len) {
3219 /* out of this device extent */
3220 if (key.objectid >= logic_end)
3225 extent = btrfs_item_ptr(l, slot,
3226 struct btrfs_extent_item);
3227 flags = btrfs_extent_flags(l, extent);
3228 generation = btrfs_extent_generation(l, extent);
3230 if (key.objectid < logical &&
3231 (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) {
3233 "scrub: tree block %llu spanning "
3234 "stripes, ignored. logical=%llu",
3235 key.objectid, logical);
3240 extent_logical = key.objectid;
3244 * trim extent to this stripe
3246 if (extent_logical < logical) {
3247 extent_len -= logical - extent_logical;
3248 extent_logical = logical;
3250 if (extent_logical + extent_len >
3251 logical + map->stripe_len) {
3252 extent_len = logical + map->stripe_len -
3256 extent_physical = extent_logical - logical + physical;
3257 extent_dev = scrub_dev;
3258 extent_mirror_num = mirror_num;
3260 scrub_remap_extent(fs_info, extent_logical,
3261 extent_len, &extent_physical,
3263 &extent_mirror_num);
3265 ret = btrfs_lookup_csums_range(csum_root, logical,
3266 logical + map->stripe_len - 1,
3267 &sctx->csum_list, 1);
3271 ret = scrub_extent(sctx, extent_logical, extent_len,
3272 extent_physical, extent_dev, flags,
3273 generation, extent_mirror_num,
3274 extent_logical - logical + physical);
3278 scrub_free_csums(sctx);
3279 if (extent_logical + extent_len <
3280 key.objectid + bytes) {
3281 if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
3282 BTRFS_BLOCK_GROUP_RAID6)) {
3284 * loop until we find next data stripe
3285 * or we have finished all stripes.
3288 physical += map->stripe_len;
3289 ret = get_raid56_logic_offset(physical,
3294 if (ret && physical < physical_end) {
3295 stripe_logical += base;
3296 stripe_end = stripe_logical +
3298 ret = scrub_raid56_parity(sctx,
3299 map, scrub_dev, ppath,
3307 physical += map->stripe_len;
3308 logical += increment;
3310 if (logical < key.objectid + bytes) {
3315 if (physical >= physical_end) {
3323 btrfs_release_path(path);
3325 logical += increment;
3326 physical += map->stripe_len;
3327 spin_lock(&sctx->stat_lock);
3329 sctx->stat.last_physical = map->stripes[num].physical +
3332 sctx->stat.last_physical = physical;
3333 spin_unlock(&sctx->stat_lock);
3338 /* push queued extents */
3340 mutex_lock(&sctx->wr_ctx.wr_lock);
3341 scrub_wr_submit(sctx);
3342 mutex_unlock(&sctx->wr_ctx.wr_lock);
3344 blk_finish_plug(&plug);
3345 btrfs_free_path(path);
3346 btrfs_free_path(ppath);
3347 return ret < 0 ? ret : 0;
3350 static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx,
3351 struct btrfs_device *scrub_dev,
3352 u64 chunk_tree, u64 chunk_objectid,
3353 u64 chunk_offset, u64 length,
3354 u64 dev_offset, int is_dev_replace)
3356 struct btrfs_mapping_tree *map_tree =
3357 &sctx->dev_root->fs_info->mapping_tree;
3358 struct map_lookup *map;
3359 struct extent_map *em;
3363 read_lock(&map_tree->map_tree.lock);
3364 em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
3365 read_unlock(&map_tree->map_tree.lock);
3370 map = (struct map_lookup *)em->bdev;
3371 if (em->start != chunk_offset)
3374 if (em->len < length)
3377 for (i = 0; i < map->num_stripes; ++i) {
3378 if (map->stripes[i].dev->bdev == scrub_dev->bdev &&
3379 map->stripes[i].physical == dev_offset) {
3380 ret = scrub_stripe(sctx, map, scrub_dev, i,
3381 chunk_offset, length,
3388 free_extent_map(em);
3393 static noinline_for_stack
3394 int scrub_enumerate_chunks(struct scrub_ctx *sctx,
3395 struct btrfs_device *scrub_dev, u64 start, u64 end,
3398 struct btrfs_dev_extent *dev_extent = NULL;
3399 struct btrfs_path *path;
3400 struct btrfs_root *root = sctx->dev_root;
3401 struct btrfs_fs_info *fs_info = root->fs_info;
3408 struct extent_buffer *l;
3409 struct btrfs_key key;
3410 struct btrfs_key found_key;
3411 struct btrfs_block_group_cache *cache;
3412 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
3414 path = btrfs_alloc_path();
3419 path->search_commit_root = 1;
3420 path->skip_locking = 1;
3422 key.objectid = scrub_dev->devid;
3424 key.type = BTRFS_DEV_EXTENT_KEY;
3427 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3431 if (path->slots[0] >=
3432 btrfs_header_nritems(path->nodes[0])) {
3433 ret = btrfs_next_leaf(root, path);
3440 slot = path->slots[0];
3442 btrfs_item_key_to_cpu(l, &found_key, slot);
3444 if (found_key.objectid != scrub_dev->devid)
3447 if (found_key.type != BTRFS_DEV_EXTENT_KEY)
3450 if (found_key.offset >= end)
3453 if (found_key.offset < key.offset)
3456 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
3457 length = btrfs_dev_extent_length(l, dev_extent);
3459 if (found_key.offset + length <= start)
3462 chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent);
3463 chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent);
3464 chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent);
3467 * get a reference on the corresponding block group to prevent
3468 * the chunk from going away while we scrub it
3470 cache = btrfs_lookup_block_group(fs_info, chunk_offset);
3472 /* some chunks are removed but not committed to disk yet,
3473 * continue scrubbing */
3477 dev_replace->cursor_right = found_key.offset + length;
3478 dev_replace->cursor_left = found_key.offset;
3479 dev_replace->item_needs_writeback = 1;
3480 ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid,
3481 chunk_offset, length, found_key.offset,
3485 * flush, submit all pending read and write bios, afterwards
3487 * Note that in the dev replace case, a read request causes
3488 * write requests that are submitted in the read completion
3489 * worker. Therefore in the current situation, it is required
3490 * that all write requests are flushed, so that all read and
3491 * write requests are really completed when bios_in_flight
3494 atomic_set(&sctx->wr_ctx.flush_all_writes, 1);
3496 mutex_lock(&sctx->wr_ctx.wr_lock);
3497 scrub_wr_submit(sctx);
3498 mutex_unlock(&sctx->wr_ctx.wr_lock);
3500 wait_event(sctx->list_wait,
3501 atomic_read(&sctx->bios_in_flight) == 0);
3502 atomic_inc(&fs_info->scrubs_paused);
3503 wake_up(&fs_info->scrub_pause_wait);
3506 * must be called before we decrease @scrub_paused.
3507 * make sure we don't block transaction commit while
3508 * we are waiting pending workers finished.
3510 wait_event(sctx->list_wait,
3511 atomic_read(&sctx->workers_pending) == 0);
3512 atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
3514 mutex_lock(&fs_info->scrub_lock);
3515 __scrub_blocked_if_needed(fs_info);
3516 atomic_dec(&fs_info->scrubs_paused);
3517 mutex_unlock(&fs_info->scrub_lock);
3518 wake_up(&fs_info->scrub_pause_wait);
3520 btrfs_put_block_group(cache);
3523 if (is_dev_replace &&
3524 atomic64_read(&dev_replace->num_write_errors) > 0) {
3528 if (sctx->stat.malloc_errors > 0) {
3533 dev_replace->cursor_left = dev_replace->cursor_right;
3534 dev_replace->item_needs_writeback = 1;
3536 key.offset = found_key.offset + length;
3537 btrfs_release_path(path);
3540 btrfs_free_path(path);
3543 * ret can still be 1 from search_slot or next_leaf,
3544 * that's not an error
3546 return ret < 0 ? ret : 0;
3549 static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx,
3550 struct btrfs_device *scrub_dev)
3556 struct btrfs_root *root = sctx->dev_root;
3558 if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state))
3561 /* Seed devices of a new filesystem has their own generation. */
3562 if (scrub_dev->fs_devices != root->fs_info->fs_devices)
3563 gen = scrub_dev->generation;
3565 gen = root->fs_info->last_trans_committed;
3567 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
3568 bytenr = btrfs_sb_offset(i);
3569 if (bytenr + BTRFS_SUPER_INFO_SIZE >
3570 scrub_dev->commit_total_bytes)
3573 ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr,
3574 scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i,
3579 wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
3585 * get a reference count on fs_info->scrub_workers. start worker if necessary
3587 static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
3591 int flags = WQ_FREEZABLE | WQ_UNBOUND;
3592 int max_active = fs_info->thread_pool_size;
3594 if (fs_info->scrub_workers_refcnt == 0) {
3596 fs_info->scrub_workers =
3597 btrfs_alloc_workqueue("btrfs-scrub", flags,
3600 fs_info->scrub_workers =
3601 btrfs_alloc_workqueue("btrfs-scrub", flags,
3603 if (!fs_info->scrub_workers) {
3607 fs_info->scrub_wr_completion_workers =
3608 btrfs_alloc_workqueue("btrfs-scrubwrc", flags,
3610 if (!fs_info->scrub_wr_completion_workers) {
3614 fs_info->scrub_nocow_workers =
3615 btrfs_alloc_workqueue("btrfs-scrubnc", flags, 1, 0);
3616 if (!fs_info->scrub_nocow_workers) {
3621 ++fs_info->scrub_workers_refcnt;
3626 static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info)
3628 if (--fs_info->scrub_workers_refcnt == 0) {
3629 btrfs_destroy_workqueue(fs_info->scrub_workers);
3630 btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers);
3631 btrfs_destroy_workqueue(fs_info->scrub_nocow_workers);
3633 WARN_ON(fs_info->scrub_workers_refcnt < 0);
3636 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3637 u64 end, struct btrfs_scrub_progress *progress,
3638 int readonly, int is_dev_replace)
3640 struct scrub_ctx *sctx;
3642 struct btrfs_device *dev;
3643 struct rcu_string *name;
3645 if (btrfs_fs_closing(fs_info))
3648 if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) {
3650 * in this case scrub is unable to calculate the checksum
3651 * the way scrub is implemented. Do not handle this
3652 * situation at all because it won't ever happen.
3655 "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails",
3656 fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN);
3660 if (fs_info->chunk_root->sectorsize != PAGE_SIZE) {
3661 /* not supported for data w/o checksums */
3663 "scrub: size assumption sectorsize != PAGE_SIZE "
3664 "(%d != %lu) fails",
3665 fs_info->chunk_root->sectorsize, PAGE_SIZE);
3669 if (fs_info->chunk_root->nodesize >
3670 PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK ||
3671 fs_info->chunk_root->sectorsize >
3672 PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) {
3674 * would exhaust the array bounds of pagev member in
3675 * struct scrub_block
3677 btrfs_err(fs_info, "scrub: size assumption nodesize and sectorsize "
3678 "<= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails",
3679 fs_info->chunk_root->nodesize,
3680 SCRUB_MAX_PAGES_PER_BLOCK,
3681 fs_info->chunk_root->sectorsize,
3682 SCRUB_MAX_PAGES_PER_BLOCK);
3687 mutex_lock(&fs_info->fs_devices->device_list_mutex);
3688 dev = btrfs_find_device(fs_info, devid, NULL, NULL);
3689 if (!dev || (dev->missing && !is_dev_replace)) {
3690 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3694 if (!is_dev_replace && !readonly && !dev->writeable) {
3695 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3697 name = rcu_dereference(dev->name);
3698 btrfs_err(fs_info, "scrub: device %s is not writable",
3704 mutex_lock(&fs_info->scrub_lock);
3705 if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) {
3706 mutex_unlock(&fs_info->scrub_lock);
3707 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3711 btrfs_dev_replace_lock(&fs_info->dev_replace);
3712 if (dev->scrub_device ||
3714 btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) {
3715 btrfs_dev_replace_unlock(&fs_info->dev_replace);
3716 mutex_unlock(&fs_info->scrub_lock);
3717 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3718 return -EINPROGRESS;
3720 btrfs_dev_replace_unlock(&fs_info->dev_replace);
3722 ret = scrub_workers_get(fs_info, is_dev_replace);
3724 mutex_unlock(&fs_info->scrub_lock);
3725 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3729 sctx = scrub_setup_ctx(dev, is_dev_replace);
3731 mutex_unlock(&fs_info->scrub_lock);
3732 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3733 scrub_workers_put(fs_info);
3734 return PTR_ERR(sctx);
3736 sctx->readonly = readonly;
3737 dev->scrub_device = sctx;
3738 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3741 * checking @scrub_pause_req here, we can avoid
3742 * race between committing transaction and scrubbing.
3744 __scrub_blocked_if_needed(fs_info);
3745 atomic_inc(&fs_info->scrubs_running);
3746 mutex_unlock(&fs_info->scrub_lock);
3748 if (!is_dev_replace) {
3750 * by holding device list mutex, we can
3751 * kick off writing super in log tree sync.
3753 mutex_lock(&fs_info->fs_devices->device_list_mutex);
3754 ret = scrub_supers(sctx, dev);
3755 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3759 ret = scrub_enumerate_chunks(sctx, dev, start, end,
3762 wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
3763 atomic_dec(&fs_info->scrubs_running);
3764 wake_up(&fs_info->scrub_pause_wait);
3766 wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0);
3769 memcpy(progress, &sctx->stat, sizeof(*progress));
3771 mutex_lock(&fs_info->scrub_lock);
3772 dev->scrub_device = NULL;
3773 scrub_workers_put(fs_info);
3774 mutex_unlock(&fs_info->scrub_lock);
3776 scrub_free_ctx(sctx);
3781 void btrfs_scrub_pause(struct btrfs_root *root)
3783 struct btrfs_fs_info *fs_info = root->fs_info;
3785 mutex_lock(&fs_info->scrub_lock);
3786 atomic_inc(&fs_info->scrub_pause_req);
3787 while (atomic_read(&fs_info->scrubs_paused) !=
3788 atomic_read(&fs_info->scrubs_running)) {
3789 mutex_unlock(&fs_info->scrub_lock);
3790 wait_event(fs_info->scrub_pause_wait,
3791 atomic_read(&fs_info->scrubs_paused) ==
3792 atomic_read(&fs_info->scrubs_running));
3793 mutex_lock(&fs_info->scrub_lock);
3795 mutex_unlock(&fs_info->scrub_lock);
3798 void btrfs_scrub_continue(struct btrfs_root *root)
3800 struct btrfs_fs_info *fs_info = root->fs_info;
3802 atomic_dec(&fs_info->scrub_pause_req);
3803 wake_up(&fs_info->scrub_pause_wait);
3806 int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info)
3808 mutex_lock(&fs_info->scrub_lock);
3809 if (!atomic_read(&fs_info->scrubs_running)) {
3810 mutex_unlock(&fs_info->scrub_lock);
3814 atomic_inc(&fs_info->scrub_cancel_req);
3815 while (atomic_read(&fs_info->scrubs_running)) {
3816 mutex_unlock(&fs_info->scrub_lock);
3817 wait_event(fs_info->scrub_pause_wait,
3818 atomic_read(&fs_info->scrubs_running) == 0);
3819 mutex_lock(&fs_info->scrub_lock);
3821 atomic_dec(&fs_info->scrub_cancel_req);
3822 mutex_unlock(&fs_info->scrub_lock);
3827 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info,
3828 struct btrfs_device *dev)
3830 struct scrub_ctx *sctx;
3832 mutex_lock(&fs_info->scrub_lock);
3833 sctx = dev->scrub_device;
3835 mutex_unlock(&fs_info->scrub_lock);
3838 atomic_inc(&sctx->cancel_req);
3839 while (dev->scrub_device) {
3840 mutex_unlock(&fs_info->scrub_lock);
3841 wait_event(fs_info->scrub_pause_wait,
3842 dev->scrub_device == NULL);
3843 mutex_lock(&fs_info->scrub_lock);
3845 mutex_unlock(&fs_info->scrub_lock);
3850 int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
3851 struct btrfs_scrub_progress *progress)
3853 struct btrfs_device *dev;
3854 struct scrub_ctx *sctx = NULL;
3856 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
3857 dev = btrfs_find_device(root->fs_info, devid, NULL, NULL);
3859 sctx = dev->scrub_device;
3861 memcpy(progress, &sctx->stat, sizeof(*progress));
3862 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
3864 return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV;
3867 static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
3868 u64 extent_logical, u64 extent_len,
3869 u64 *extent_physical,
3870 struct btrfs_device **extent_dev,
3871 int *extent_mirror_num)
3874 struct btrfs_bio *bbio = NULL;
3877 mapped_length = extent_len;
3878 ret = btrfs_map_block(fs_info, READ, extent_logical,
3879 &mapped_length, &bbio, 0);
3880 if (ret || !bbio || mapped_length < extent_len ||
3881 !bbio->stripes[0].dev->bdev) {
3882 btrfs_put_bbio(bbio);
3886 *extent_physical = bbio->stripes[0].physical;
3887 *extent_mirror_num = bbio->mirror_num;
3888 *extent_dev = bbio->stripes[0].dev;
3889 btrfs_put_bbio(bbio);
3892 static int scrub_setup_wr_ctx(struct scrub_ctx *sctx,
3893 struct scrub_wr_ctx *wr_ctx,
3894 struct btrfs_fs_info *fs_info,
3895 struct btrfs_device *dev,
3898 WARN_ON(wr_ctx->wr_curr_bio != NULL);
3900 mutex_init(&wr_ctx->wr_lock);
3901 wr_ctx->wr_curr_bio = NULL;
3902 if (!is_dev_replace)
3905 WARN_ON(!dev->bdev);
3906 wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO,
3907 bio_get_nr_vecs(dev->bdev));
3908 wr_ctx->tgtdev = dev;
3909 atomic_set(&wr_ctx->flush_all_writes, 0);
3913 static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx)
3915 mutex_lock(&wr_ctx->wr_lock);
3916 kfree(wr_ctx->wr_curr_bio);
3917 wr_ctx->wr_curr_bio = NULL;
3918 mutex_unlock(&wr_ctx->wr_lock);
3921 static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
3922 int mirror_num, u64 physical_for_dev_replace)
3924 struct scrub_copy_nocow_ctx *nocow_ctx;
3925 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
3927 nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS);
3929 spin_lock(&sctx->stat_lock);
3930 sctx->stat.malloc_errors++;
3931 spin_unlock(&sctx->stat_lock);
3935 scrub_pending_trans_workers_inc(sctx);
3937 nocow_ctx->sctx = sctx;
3938 nocow_ctx->logical = logical;
3939 nocow_ctx->len = len;
3940 nocow_ctx->mirror_num = mirror_num;
3941 nocow_ctx->physical_for_dev_replace = physical_for_dev_replace;
3942 btrfs_init_work(&nocow_ctx->work, btrfs_scrubnc_helper,
3943 copy_nocow_pages_worker, NULL, NULL);
3944 INIT_LIST_HEAD(&nocow_ctx->inodes);
3945 btrfs_queue_work(fs_info->scrub_nocow_workers,
3951 static int record_inode_for_nocow(u64 inum, u64 offset, u64 root, void *ctx)
3953 struct scrub_copy_nocow_ctx *nocow_ctx = ctx;
3954 struct scrub_nocow_inode *nocow_inode;
3956 nocow_inode = kzalloc(sizeof(*nocow_inode), GFP_NOFS);
3959 nocow_inode->inum = inum;
3960 nocow_inode->offset = offset;
3961 nocow_inode->root = root;
3962 list_add_tail(&nocow_inode->list, &nocow_ctx->inodes);
3966 #define COPY_COMPLETE 1
3968 static void copy_nocow_pages_worker(struct btrfs_work *work)
3970 struct scrub_copy_nocow_ctx *nocow_ctx =
3971 container_of(work, struct scrub_copy_nocow_ctx, work);
3972 struct scrub_ctx *sctx = nocow_ctx->sctx;
3973 u64 logical = nocow_ctx->logical;
3974 u64 len = nocow_ctx->len;
3975 int mirror_num = nocow_ctx->mirror_num;
3976 u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace;
3978 struct btrfs_trans_handle *trans = NULL;
3979 struct btrfs_fs_info *fs_info;
3980 struct btrfs_path *path;
3981 struct btrfs_root *root;
3982 int not_written = 0;
3984 fs_info = sctx->dev_root->fs_info;
3985 root = fs_info->extent_root;
3987 path = btrfs_alloc_path();
3989 spin_lock(&sctx->stat_lock);
3990 sctx->stat.malloc_errors++;
3991 spin_unlock(&sctx->stat_lock);
3996 trans = btrfs_join_transaction(root);
3997 if (IS_ERR(trans)) {
4002 ret = iterate_inodes_from_logical(logical, fs_info, path,
4003 record_inode_for_nocow, nocow_ctx);
4004 if (ret != 0 && ret != -ENOENT) {
4005 btrfs_warn(fs_info, "iterate_inodes_from_logical() failed: log %llu, "
4006 "phys %llu, len %llu, mir %u, ret %d",
4007 logical, physical_for_dev_replace, len, mirror_num,
4013 btrfs_end_transaction(trans, root);
4015 while (!list_empty(&nocow_ctx->inodes)) {
4016 struct scrub_nocow_inode *entry;
4017 entry = list_first_entry(&nocow_ctx->inodes,
4018 struct scrub_nocow_inode,
4020 list_del_init(&entry->list);
4021 ret = copy_nocow_pages_for_inode(entry->inum, entry->offset,
4022 entry->root, nocow_ctx);
4024 if (ret == COPY_COMPLETE) {
4032 while (!list_empty(&nocow_ctx->inodes)) {
4033 struct scrub_nocow_inode *entry;
4034 entry = list_first_entry(&nocow_ctx->inodes,
4035 struct scrub_nocow_inode,
4037 list_del_init(&entry->list);
4040 if (trans && !IS_ERR(trans))
4041 btrfs_end_transaction(trans, root);
4043 btrfs_dev_replace_stats_inc(&fs_info->dev_replace.
4044 num_uncorrectable_read_errors);
4046 btrfs_free_path(path);
4049 scrub_pending_trans_workers_dec(sctx);
4052 static int check_extent_to_block(struct inode *inode, u64 start, u64 len,
4055 struct extent_state *cached_state = NULL;
4056 struct btrfs_ordered_extent *ordered;
4057 struct extent_io_tree *io_tree;
4058 struct extent_map *em;
4059 u64 lockstart = start, lockend = start + len - 1;
4062 io_tree = &BTRFS_I(inode)->io_tree;
4064 lock_extent_bits(io_tree, lockstart, lockend, 0, &cached_state);
4065 ordered = btrfs_lookup_ordered_range(inode, lockstart, len);
4067 btrfs_put_ordered_extent(ordered);
4072 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
4079 * This extent does not actually cover the logical extent anymore,
4080 * move on to the next inode.
4082 if (em->block_start > logical ||
4083 em->block_start + em->block_len < logical + len) {
4084 free_extent_map(em);
4088 free_extent_map(em);
4091 unlock_extent_cached(io_tree, lockstart, lockend, &cached_state,
4096 static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root,
4097 struct scrub_copy_nocow_ctx *nocow_ctx)
4099 struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info;
4100 struct btrfs_key key;
4101 struct inode *inode;
4103 struct btrfs_root *local_root;
4104 struct extent_io_tree *io_tree;
4105 u64 physical_for_dev_replace;
4106 u64 nocow_ctx_logical;
4107 u64 len = nocow_ctx->len;
4108 unsigned long index;
4113 key.objectid = root;
4114 key.type = BTRFS_ROOT_ITEM_KEY;
4115 key.offset = (u64)-1;
4117 srcu_index = srcu_read_lock(&fs_info->subvol_srcu);
4119 local_root = btrfs_read_fs_root_no_name(fs_info, &key);
4120 if (IS_ERR(local_root)) {
4121 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
4122 return PTR_ERR(local_root);
4125 key.type = BTRFS_INODE_ITEM_KEY;
4126 key.objectid = inum;
4128 inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
4129 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
4131 return PTR_ERR(inode);
4133 /* Avoid truncate/dio/punch hole.. */
4134 mutex_lock(&inode->i_mutex);
4135 inode_dio_wait(inode);
4137 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace;
4138 io_tree = &BTRFS_I(inode)->io_tree;
4139 nocow_ctx_logical = nocow_ctx->logical;
4141 ret = check_extent_to_block(inode, offset, len, nocow_ctx_logical);
4143 ret = ret > 0 ? 0 : ret;
4147 while (len >= PAGE_CACHE_SIZE) {
4148 index = offset >> PAGE_CACHE_SHIFT;
4150 page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
4152 btrfs_err(fs_info, "find_or_create_page() failed");
4157 if (PageUptodate(page)) {
4158 if (PageDirty(page))
4161 ClearPageError(page);
4162 err = extent_read_full_page(io_tree, page,
4164 nocow_ctx->mirror_num);
4172 * If the page has been remove from the page cache,
4173 * the data on it is meaningless, because it may be
4174 * old one, the new data may be written into the new
4175 * page in the page cache.
4177 if (page->mapping != inode->i_mapping) {
4179 page_cache_release(page);
4182 if (!PageUptodate(page)) {
4188 ret = check_extent_to_block(inode, offset, len,
4191 ret = ret > 0 ? 0 : ret;
4195 err = write_page_nocow(nocow_ctx->sctx,
4196 physical_for_dev_replace, page);
4201 page_cache_release(page);
4206 offset += PAGE_CACHE_SIZE;
4207 physical_for_dev_replace += PAGE_CACHE_SIZE;
4208 nocow_ctx_logical += PAGE_CACHE_SIZE;
4209 len -= PAGE_CACHE_SIZE;
4211 ret = COPY_COMPLETE;
4213 mutex_unlock(&inode->i_mutex);
4218 static int write_page_nocow(struct scrub_ctx *sctx,
4219 u64 physical_for_dev_replace, struct page *page)
4222 struct btrfs_device *dev;
4225 dev = sctx->wr_ctx.tgtdev;
4229 printk_ratelimited(KERN_WARNING
4230 "BTRFS: scrub write_page_nocow(bdev == NULL) is unexpected!\n");
4233 bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
4235 spin_lock(&sctx->stat_lock);
4236 sctx->stat.malloc_errors++;
4237 spin_unlock(&sctx->stat_lock);
4240 bio->bi_iter.bi_size = 0;
4241 bio->bi_iter.bi_sector = physical_for_dev_replace >> 9;
4242 bio->bi_bdev = dev->bdev;
4243 ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0);
4244 if (ret != PAGE_CACHE_SIZE) {
4247 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
4251 if (btrfsic_submit_bio_wait(WRITE_SYNC, bio))
4252 goto leave_with_eio;