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;
74 struct scrub_block *sblock;
76 struct btrfs_device *dev;
77 struct list_head list;
78 u64 flags; /* extent flags */
82 u64 physical_for_dev_replace;
85 unsigned int mirror_num:8;
86 unsigned int have_csum:1;
87 unsigned int io_error:1;
89 u8 csum[BTRFS_CSUM_SIZE];
91 struct scrub_recover *recover;
96 struct scrub_ctx *sctx;
97 struct btrfs_device *dev;
102 #if SCRUB_PAGES_PER_WR_BIO >= SCRUB_PAGES_PER_RD_BIO
103 struct scrub_page *pagev[SCRUB_PAGES_PER_WR_BIO];
105 struct scrub_page *pagev[SCRUB_PAGES_PER_RD_BIO];
109 struct btrfs_work work;
113 struct scrub_page *pagev[SCRUB_MAX_PAGES_PER_BLOCK];
115 atomic_t outstanding_pages;
116 atomic_t ref_count; /* free mem on transition to zero */
117 struct scrub_ctx *sctx;
118 struct scrub_parity *sparity;
120 unsigned int header_error:1;
121 unsigned int checksum_error:1;
122 unsigned int no_io_error_seen:1;
123 unsigned int generation_error:1; /* also sets header_error */
125 /* The following is for the data used to check parity */
126 /* It is for the data with checksum */
127 unsigned int data_corrected:1;
131 /* Used for the chunks with parity stripe such RAID5/6 */
132 struct scrub_parity {
133 struct scrub_ctx *sctx;
135 struct btrfs_device *scrub_dev;
147 struct list_head spages;
149 /* Work of parity check and repair */
150 struct btrfs_work work;
152 /* Mark the parity blocks which have data */
153 unsigned long *dbitmap;
156 * Mark the parity blocks which have data, but errors happen when
157 * read data or check data
159 unsigned long *ebitmap;
161 unsigned long bitmap[0];
164 struct scrub_wr_ctx {
165 struct scrub_bio *wr_curr_bio;
166 struct btrfs_device *tgtdev;
167 int pages_per_wr_bio; /* <= SCRUB_PAGES_PER_WR_BIO */
168 atomic_t flush_all_writes;
169 struct mutex wr_lock;
173 struct scrub_bio *bios[SCRUB_BIOS_PER_SCTX];
174 struct btrfs_root *dev_root;
177 atomic_t bios_in_flight;
178 atomic_t workers_pending;
179 spinlock_t list_lock;
180 wait_queue_head_t list_wait;
182 struct list_head csum_list;
185 int pages_per_rd_bio;
190 struct scrub_wr_ctx wr_ctx;
195 struct btrfs_scrub_progress stat;
196 spinlock_t stat_lock;
199 struct scrub_fixup_nodatasum {
200 struct scrub_ctx *sctx;
201 struct btrfs_device *dev;
203 struct btrfs_root *root;
204 struct btrfs_work work;
208 struct scrub_nocow_inode {
212 struct list_head list;
215 struct scrub_copy_nocow_ctx {
216 struct scrub_ctx *sctx;
220 u64 physical_for_dev_replace;
221 struct list_head inodes;
222 struct btrfs_work work;
225 struct scrub_warning {
226 struct btrfs_path *path;
227 u64 extent_item_size;
231 struct btrfs_device *dev;
234 static void scrub_pending_bio_inc(struct scrub_ctx *sctx);
235 static void scrub_pending_bio_dec(struct scrub_ctx *sctx);
236 static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx);
237 static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx);
238 static int scrub_handle_errored_block(struct scrub_block *sblock_to_check);
239 static int scrub_setup_recheck_block(struct scrub_ctx *sctx,
240 struct btrfs_fs_info *fs_info,
241 struct scrub_block *original_sblock,
242 u64 length, u64 logical,
243 struct scrub_block *sblocks_for_recheck);
244 static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
245 struct scrub_block *sblock, int is_metadata,
246 int have_csum, u8 *csum, u64 generation,
247 u16 csum_size, int retry_failed_mirror);
248 static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info,
249 struct scrub_block *sblock,
250 int is_metadata, int have_csum,
251 const u8 *csum, u64 generation,
253 static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
254 struct scrub_block *sblock_good,
256 static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
257 struct scrub_block *sblock_good,
258 int page_num, int force_write);
259 static void scrub_write_block_to_dev_replace(struct scrub_block *sblock);
260 static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
262 static int scrub_checksum_data(struct scrub_block *sblock);
263 static int scrub_checksum_tree_block(struct scrub_block *sblock);
264 static int scrub_checksum_super(struct scrub_block *sblock);
265 static void scrub_block_get(struct scrub_block *sblock);
266 static void scrub_block_put(struct scrub_block *sblock);
267 static void scrub_page_get(struct scrub_page *spage);
268 static void scrub_page_put(struct scrub_page *spage);
269 static void scrub_parity_get(struct scrub_parity *sparity);
270 static void scrub_parity_put(struct scrub_parity *sparity);
271 static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
272 struct scrub_page *spage);
273 static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
274 u64 physical, struct btrfs_device *dev, u64 flags,
275 u64 gen, int mirror_num, u8 *csum, int force,
276 u64 physical_for_dev_replace);
277 static void scrub_bio_end_io(struct bio *bio, int err);
278 static void scrub_bio_end_io_worker(struct btrfs_work *work);
279 static void scrub_block_complete(struct scrub_block *sblock);
280 static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
281 u64 extent_logical, u64 extent_len,
282 u64 *extent_physical,
283 struct btrfs_device **extent_dev,
284 int *extent_mirror_num);
285 static int scrub_setup_wr_ctx(struct scrub_ctx *sctx,
286 struct scrub_wr_ctx *wr_ctx,
287 struct btrfs_fs_info *fs_info,
288 struct btrfs_device *dev,
290 static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx);
291 static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
292 struct scrub_page *spage);
293 static void scrub_wr_submit(struct scrub_ctx *sctx);
294 static void scrub_wr_bio_end_io(struct bio *bio, int err);
295 static void scrub_wr_bio_end_io_worker(struct btrfs_work *work);
296 static int write_page_nocow(struct scrub_ctx *sctx,
297 u64 physical_for_dev_replace, struct page *page);
298 static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root,
299 struct scrub_copy_nocow_ctx *ctx);
300 static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
301 int mirror_num, u64 physical_for_dev_replace);
302 static void copy_nocow_pages_worker(struct btrfs_work *work);
303 static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info);
304 static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info);
307 static void scrub_pending_bio_inc(struct scrub_ctx *sctx)
309 atomic_inc(&sctx->bios_in_flight);
312 static void scrub_pending_bio_dec(struct scrub_ctx *sctx)
314 atomic_dec(&sctx->bios_in_flight);
315 wake_up(&sctx->list_wait);
318 static void __scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
320 while (atomic_read(&fs_info->scrub_pause_req)) {
321 mutex_unlock(&fs_info->scrub_lock);
322 wait_event(fs_info->scrub_pause_wait,
323 atomic_read(&fs_info->scrub_pause_req) == 0);
324 mutex_lock(&fs_info->scrub_lock);
328 static void scrub_blocked_if_needed(struct btrfs_fs_info *fs_info)
330 atomic_inc(&fs_info->scrubs_paused);
331 wake_up(&fs_info->scrub_pause_wait);
333 mutex_lock(&fs_info->scrub_lock);
334 __scrub_blocked_if_needed(fs_info);
335 atomic_dec(&fs_info->scrubs_paused);
336 mutex_unlock(&fs_info->scrub_lock);
338 wake_up(&fs_info->scrub_pause_wait);
342 * used for workers that require transaction commits (i.e., for the
345 static void scrub_pending_trans_workers_inc(struct scrub_ctx *sctx)
347 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
350 * increment scrubs_running to prevent cancel requests from
351 * completing as long as a worker is running. we must also
352 * increment scrubs_paused to prevent deadlocking on pause
353 * requests used for transactions commits (as the worker uses a
354 * transaction context). it is safe to regard the worker
355 * as paused for all matters practical. effectively, we only
356 * avoid cancellation requests from completing.
358 mutex_lock(&fs_info->scrub_lock);
359 atomic_inc(&fs_info->scrubs_running);
360 atomic_inc(&fs_info->scrubs_paused);
361 mutex_unlock(&fs_info->scrub_lock);
364 * check if @scrubs_running=@scrubs_paused condition
365 * inside wait_event() is not an atomic operation.
366 * which means we may inc/dec @scrub_running/paused
367 * at any time. Let's wake up @scrub_pause_wait as
368 * much as we can to let commit transaction blocked less.
370 wake_up(&fs_info->scrub_pause_wait);
372 atomic_inc(&sctx->workers_pending);
375 /* used for workers that require transaction commits */
376 static void scrub_pending_trans_workers_dec(struct scrub_ctx *sctx)
378 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
381 * see scrub_pending_trans_workers_inc() why we're pretending
382 * to be paused in the scrub counters
384 mutex_lock(&fs_info->scrub_lock);
385 atomic_dec(&fs_info->scrubs_running);
386 atomic_dec(&fs_info->scrubs_paused);
387 mutex_unlock(&fs_info->scrub_lock);
388 atomic_dec(&sctx->workers_pending);
389 wake_up(&fs_info->scrub_pause_wait);
390 wake_up(&sctx->list_wait);
393 static void scrub_free_csums(struct scrub_ctx *sctx)
395 while (!list_empty(&sctx->csum_list)) {
396 struct btrfs_ordered_sum *sum;
397 sum = list_first_entry(&sctx->csum_list,
398 struct btrfs_ordered_sum, list);
399 list_del(&sum->list);
404 static noinline_for_stack void scrub_free_ctx(struct scrub_ctx *sctx)
411 scrub_free_wr_ctx(&sctx->wr_ctx);
413 /* this can happen when scrub is cancelled */
414 if (sctx->curr != -1) {
415 struct scrub_bio *sbio = sctx->bios[sctx->curr];
417 for (i = 0; i < sbio->page_count; i++) {
418 WARN_ON(!sbio->pagev[i]->page);
419 scrub_block_put(sbio->pagev[i]->sblock);
424 for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
425 struct scrub_bio *sbio = sctx->bios[i];
432 scrub_free_csums(sctx);
436 static noinline_for_stack
437 struct scrub_ctx *scrub_setup_ctx(struct btrfs_device *dev, int is_dev_replace)
439 struct scrub_ctx *sctx;
441 struct btrfs_fs_info *fs_info = dev->dev_root->fs_info;
442 int pages_per_rd_bio;
446 * the setting of pages_per_rd_bio is correct for scrub but might
447 * be wrong for the dev_replace code where we might read from
448 * different devices in the initial huge bios. However, that
449 * code is able to correctly handle the case when adding a page
453 pages_per_rd_bio = min_t(int, SCRUB_PAGES_PER_RD_BIO,
454 bio_get_nr_vecs(dev->bdev));
456 pages_per_rd_bio = SCRUB_PAGES_PER_RD_BIO;
457 sctx = kzalloc(sizeof(*sctx), GFP_NOFS);
460 sctx->is_dev_replace = is_dev_replace;
461 sctx->pages_per_rd_bio = pages_per_rd_bio;
463 sctx->dev_root = dev->dev_root;
464 for (i = 0; i < SCRUB_BIOS_PER_SCTX; ++i) {
465 struct scrub_bio *sbio;
467 sbio = kzalloc(sizeof(*sbio), GFP_NOFS);
470 sctx->bios[i] = sbio;
474 sbio->page_count = 0;
475 btrfs_init_work(&sbio->work, btrfs_scrub_helper,
476 scrub_bio_end_io_worker, NULL, NULL);
478 if (i != SCRUB_BIOS_PER_SCTX - 1)
479 sctx->bios[i]->next_free = i + 1;
481 sctx->bios[i]->next_free = -1;
483 sctx->first_free = 0;
484 sctx->nodesize = dev->dev_root->nodesize;
485 sctx->sectorsize = dev->dev_root->sectorsize;
486 atomic_set(&sctx->bios_in_flight, 0);
487 atomic_set(&sctx->workers_pending, 0);
488 atomic_set(&sctx->cancel_req, 0);
489 sctx->csum_size = btrfs_super_csum_size(fs_info->super_copy);
490 INIT_LIST_HEAD(&sctx->csum_list);
492 spin_lock_init(&sctx->list_lock);
493 spin_lock_init(&sctx->stat_lock);
494 init_waitqueue_head(&sctx->list_wait);
496 ret = scrub_setup_wr_ctx(sctx, &sctx->wr_ctx, fs_info,
497 fs_info->dev_replace.tgtdev, is_dev_replace);
499 scrub_free_ctx(sctx);
505 scrub_free_ctx(sctx);
506 return ERR_PTR(-ENOMEM);
509 static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root,
516 struct extent_buffer *eb;
517 struct btrfs_inode_item *inode_item;
518 struct scrub_warning *swarn = warn_ctx;
519 struct btrfs_fs_info *fs_info = swarn->dev->dev_root->fs_info;
520 struct inode_fs_paths *ipath = NULL;
521 struct btrfs_root *local_root;
522 struct btrfs_key root_key;
523 struct btrfs_key key;
525 root_key.objectid = root;
526 root_key.type = BTRFS_ROOT_ITEM_KEY;
527 root_key.offset = (u64)-1;
528 local_root = btrfs_read_fs_root_no_name(fs_info, &root_key);
529 if (IS_ERR(local_root)) {
530 ret = PTR_ERR(local_root);
535 * this makes the path point to (inum INODE_ITEM ioff)
538 key.type = BTRFS_INODE_ITEM_KEY;
541 ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0);
543 btrfs_release_path(swarn->path);
547 eb = swarn->path->nodes[0];
548 inode_item = btrfs_item_ptr(eb, swarn->path->slots[0],
549 struct btrfs_inode_item);
550 isize = btrfs_inode_size(eb, inode_item);
551 nlink = btrfs_inode_nlink(eb, inode_item);
552 btrfs_release_path(swarn->path);
554 ipath = init_ipath(4096, local_root, swarn->path);
556 ret = PTR_ERR(ipath);
560 ret = paths_from_inode(inum, ipath);
566 * we deliberately ignore the bit ipath might have been too small to
567 * hold all of the paths here
569 for (i = 0; i < ipath->fspath->elem_cnt; ++i)
570 printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev "
571 "%s, sector %llu, root %llu, inode %llu, offset %llu, "
572 "length %llu, links %u (path: %s)\n", swarn->errstr,
573 swarn->logical, rcu_str_deref(swarn->dev->name),
574 (unsigned long long)swarn->sector, root, inum, offset,
575 min(isize - offset, (u64)PAGE_SIZE), nlink,
576 (char *)(unsigned long)ipath->fspath->val[i]);
582 printk_in_rcu(KERN_WARNING "BTRFS: %s at logical %llu on dev "
583 "%s, sector %llu, root %llu, inode %llu, offset %llu: path "
584 "resolving failed with ret=%d\n", swarn->errstr,
585 swarn->logical, rcu_str_deref(swarn->dev->name),
586 (unsigned long long)swarn->sector, root, inum, offset, ret);
592 static void scrub_print_warning(const char *errstr, struct scrub_block *sblock)
594 struct btrfs_device *dev;
595 struct btrfs_fs_info *fs_info;
596 struct btrfs_path *path;
597 struct btrfs_key found_key;
598 struct extent_buffer *eb;
599 struct btrfs_extent_item *ei;
600 struct scrub_warning swarn;
601 unsigned long ptr = 0;
609 WARN_ON(sblock->page_count < 1);
610 dev = sblock->pagev[0]->dev;
611 fs_info = sblock->sctx->dev_root->fs_info;
613 path = btrfs_alloc_path();
617 swarn.sector = (sblock->pagev[0]->physical) >> 9;
618 swarn.logical = sblock->pagev[0]->logical;
619 swarn.errstr = errstr;
622 ret = extent_from_logical(fs_info, swarn.logical, path, &found_key,
627 extent_item_pos = swarn.logical - found_key.objectid;
628 swarn.extent_item_size = found_key.offset;
631 ei = btrfs_item_ptr(eb, path->slots[0], struct btrfs_extent_item);
632 item_size = btrfs_item_size_nr(eb, path->slots[0]);
634 if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
636 ret = tree_backref_for_extent(&ptr, eb, &found_key, ei,
637 item_size, &ref_root,
639 printk_in_rcu(KERN_WARNING
640 "BTRFS: %s at logical %llu on dev %s, "
641 "sector %llu: metadata %s (level %d) in tree "
642 "%llu\n", errstr, swarn.logical,
643 rcu_str_deref(dev->name),
644 (unsigned long long)swarn.sector,
645 ref_level ? "node" : "leaf",
646 ret < 0 ? -1 : ref_level,
647 ret < 0 ? -1 : ref_root);
649 btrfs_release_path(path);
651 btrfs_release_path(path);
654 iterate_extent_inodes(fs_info, found_key.objectid,
656 scrub_print_warning_inode, &swarn);
660 btrfs_free_path(path);
663 static int scrub_fixup_readpage(u64 inum, u64 offset, u64 root, void *fixup_ctx)
665 struct page *page = NULL;
667 struct scrub_fixup_nodatasum *fixup = fixup_ctx;
670 struct btrfs_key key;
671 struct inode *inode = NULL;
672 struct btrfs_fs_info *fs_info;
673 u64 end = offset + PAGE_SIZE - 1;
674 struct btrfs_root *local_root;
678 key.type = BTRFS_ROOT_ITEM_KEY;
679 key.offset = (u64)-1;
681 fs_info = fixup->root->fs_info;
682 srcu_index = srcu_read_lock(&fs_info->subvol_srcu);
684 local_root = btrfs_read_fs_root_no_name(fs_info, &key);
685 if (IS_ERR(local_root)) {
686 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
687 return PTR_ERR(local_root);
690 key.type = BTRFS_INODE_ITEM_KEY;
693 inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
694 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
696 return PTR_ERR(inode);
698 index = offset >> PAGE_CACHE_SHIFT;
700 page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
706 if (PageUptodate(page)) {
707 if (PageDirty(page)) {
709 * we need to write the data to the defect sector. the
710 * data that was in that sector is not in memory,
711 * because the page was modified. we must not write the
712 * modified page to that sector.
714 * TODO: what could be done here: wait for the delalloc
715 * runner to write out that page (might involve
716 * COW) and see whether the sector is still
717 * referenced afterwards.
719 * For the meantime, we'll treat this error
720 * incorrectable, although there is a chance that a
721 * later scrub will find the bad sector again and that
722 * there's no dirty page in memory, then.
727 ret = repair_io_failure(inode, offset, PAGE_SIZE,
728 fixup->logical, page,
729 offset - page_offset(page),
735 * we need to get good data first. the general readpage path
736 * will call repair_io_failure for us, we just have to make
737 * sure we read the bad mirror.
739 ret = set_extent_bits(&BTRFS_I(inode)->io_tree, offset, end,
740 EXTENT_DAMAGED, GFP_NOFS);
742 /* set_extent_bits should give proper error */
749 ret = extent_read_full_page(&BTRFS_I(inode)->io_tree, page,
752 wait_on_page_locked(page);
754 corrected = !test_range_bit(&BTRFS_I(inode)->io_tree, offset,
755 end, EXTENT_DAMAGED, 0, NULL);
757 clear_extent_bits(&BTRFS_I(inode)->io_tree, offset, end,
758 EXTENT_DAMAGED, GFP_NOFS);
770 if (ret == 0 && corrected) {
772 * we only need to call readpage for one of the inodes belonging
773 * to this extent. so make iterate_extent_inodes stop
781 static void scrub_fixup_nodatasum(struct btrfs_work *work)
784 struct scrub_fixup_nodatasum *fixup;
785 struct scrub_ctx *sctx;
786 struct btrfs_trans_handle *trans = NULL;
787 struct btrfs_path *path;
788 int uncorrectable = 0;
790 fixup = container_of(work, struct scrub_fixup_nodatasum, work);
793 path = btrfs_alloc_path();
795 spin_lock(&sctx->stat_lock);
796 ++sctx->stat.malloc_errors;
797 spin_unlock(&sctx->stat_lock);
802 trans = btrfs_join_transaction(fixup->root);
809 * the idea is to trigger a regular read through the standard path. we
810 * read a page from the (failed) logical address by specifying the
811 * corresponding copynum of the failed sector. thus, that readpage is
813 * that is the point where on-the-fly error correction will kick in
814 * (once it's finished) and rewrite the failed sector if a good copy
817 ret = iterate_inodes_from_logical(fixup->logical, fixup->root->fs_info,
818 path, scrub_fixup_readpage,
826 spin_lock(&sctx->stat_lock);
827 ++sctx->stat.corrected_errors;
828 spin_unlock(&sctx->stat_lock);
831 if (trans && !IS_ERR(trans))
832 btrfs_end_transaction(trans, fixup->root);
834 spin_lock(&sctx->stat_lock);
835 ++sctx->stat.uncorrectable_errors;
836 spin_unlock(&sctx->stat_lock);
837 btrfs_dev_replace_stats_inc(
838 &sctx->dev_root->fs_info->dev_replace.
839 num_uncorrectable_read_errors);
840 printk_ratelimited_in_rcu(KERN_ERR "BTRFS: "
841 "unable to fixup (nodatasum) error at logical %llu on dev %s\n",
842 fixup->logical, rcu_str_deref(fixup->dev->name));
845 btrfs_free_path(path);
848 scrub_pending_trans_workers_dec(sctx);
851 static inline void scrub_get_recover(struct scrub_recover *recover)
853 atomic_inc(&recover->refs);
856 static inline void scrub_put_recover(struct scrub_recover *recover)
858 if (atomic_dec_and_test(&recover->refs)) {
859 kfree(recover->bbio);
860 kfree(recover->raid_map);
866 * scrub_handle_errored_block gets called when either verification of the
867 * pages failed or the bio failed to read, e.g. with EIO. In the latter
868 * case, this function handles all pages in the bio, even though only one
870 * The goal of this function is to repair the errored block by using the
871 * contents of one of the mirrors.
873 static int scrub_handle_errored_block(struct scrub_block *sblock_to_check)
875 struct scrub_ctx *sctx = sblock_to_check->sctx;
876 struct btrfs_device *dev;
877 struct btrfs_fs_info *fs_info;
881 unsigned int failed_mirror_index;
882 unsigned int is_metadata;
883 unsigned int have_csum;
885 struct scrub_block *sblocks_for_recheck; /* holds one for each mirror */
886 struct scrub_block *sblock_bad;
891 static DEFINE_RATELIMIT_STATE(_rs, DEFAULT_RATELIMIT_INTERVAL,
892 DEFAULT_RATELIMIT_BURST);
894 BUG_ON(sblock_to_check->page_count < 1);
895 fs_info = sctx->dev_root->fs_info;
896 if (sblock_to_check->pagev[0]->flags & BTRFS_EXTENT_FLAG_SUPER) {
898 * if we find an error in a super block, we just report it.
899 * They will get written with the next transaction commit
902 spin_lock(&sctx->stat_lock);
903 ++sctx->stat.super_errors;
904 spin_unlock(&sctx->stat_lock);
907 length = sblock_to_check->page_count * PAGE_SIZE;
908 logical = sblock_to_check->pagev[0]->logical;
909 generation = sblock_to_check->pagev[0]->generation;
910 BUG_ON(sblock_to_check->pagev[0]->mirror_num < 1);
911 failed_mirror_index = sblock_to_check->pagev[0]->mirror_num - 1;
912 is_metadata = !(sblock_to_check->pagev[0]->flags &
913 BTRFS_EXTENT_FLAG_DATA);
914 have_csum = sblock_to_check->pagev[0]->have_csum;
915 csum = sblock_to_check->pagev[0]->csum;
916 dev = sblock_to_check->pagev[0]->dev;
918 if (sctx->is_dev_replace && !is_metadata && !have_csum) {
919 sblocks_for_recheck = NULL;
924 * read all mirrors one after the other. This includes to
925 * re-read the extent or metadata block that failed (that was
926 * the cause that this fixup code is called) another time,
927 * page by page this time in order to know which pages
928 * caused I/O errors and which ones are good (for all mirrors).
929 * It is the goal to handle the situation when more than one
930 * mirror contains I/O errors, but the errors do not
931 * overlap, i.e. the data can be repaired by selecting the
932 * pages from those mirrors without I/O error on the
933 * particular pages. One example (with blocks >= 2 * PAGE_SIZE)
934 * would be that mirror #1 has an I/O error on the first page,
935 * the second page is good, and mirror #2 has an I/O error on
936 * the second page, but the first page is good.
937 * Then the first page of the first mirror can be repaired by
938 * taking the first page of the second mirror, and the
939 * second page of the second mirror can be repaired by
940 * copying the contents of the 2nd page of the 1st mirror.
941 * One more note: if the pages of one mirror contain I/O
942 * errors, the checksum cannot be verified. In order to get
943 * the best data for repairing, the first attempt is to find
944 * a mirror without I/O errors and with a validated checksum.
945 * Only if this is not possible, the pages are picked from
946 * mirrors with I/O errors without considering the checksum.
947 * If the latter is the case, at the end, the checksum of the
948 * repaired area is verified in order to correctly maintain
952 sblocks_for_recheck = kzalloc(BTRFS_MAX_MIRRORS *
953 sizeof(*sblocks_for_recheck),
955 if (!sblocks_for_recheck) {
956 spin_lock(&sctx->stat_lock);
957 sctx->stat.malloc_errors++;
958 sctx->stat.read_errors++;
959 sctx->stat.uncorrectable_errors++;
960 spin_unlock(&sctx->stat_lock);
961 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
965 /* setup the context, map the logical blocks and alloc the pages */
966 ret = scrub_setup_recheck_block(sctx, fs_info, sblock_to_check, length,
967 logical, sblocks_for_recheck);
969 spin_lock(&sctx->stat_lock);
970 sctx->stat.read_errors++;
971 sctx->stat.uncorrectable_errors++;
972 spin_unlock(&sctx->stat_lock);
973 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
976 BUG_ON(failed_mirror_index >= BTRFS_MAX_MIRRORS);
977 sblock_bad = sblocks_for_recheck + failed_mirror_index;
979 /* build and submit the bios for the failed mirror, check checksums */
980 scrub_recheck_block(fs_info, sblock_bad, is_metadata, have_csum,
981 csum, generation, sctx->csum_size, 1);
983 if (!sblock_bad->header_error && !sblock_bad->checksum_error &&
984 sblock_bad->no_io_error_seen) {
986 * the error disappeared after reading page by page, or
987 * the area was part of a huge bio and other parts of the
988 * bio caused I/O errors, or the block layer merged several
989 * read requests into one and the error is caused by a
990 * different bio (usually one of the two latter cases is
993 spin_lock(&sctx->stat_lock);
994 sctx->stat.unverified_errors++;
995 sblock_to_check->data_corrected = 1;
996 spin_unlock(&sctx->stat_lock);
998 if (sctx->is_dev_replace)
999 scrub_write_block_to_dev_replace(sblock_bad);
1003 if (!sblock_bad->no_io_error_seen) {
1004 spin_lock(&sctx->stat_lock);
1005 sctx->stat.read_errors++;
1006 spin_unlock(&sctx->stat_lock);
1007 if (__ratelimit(&_rs))
1008 scrub_print_warning("i/o error", sblock_to_check);
1009 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_READ_ERRS);
1010 } else if (sblock_bad->checksum_error) {
1011 spin_lock(&sctx->stat_lock);
1012 sctx->stat.csum_errors++;
1013 spin_unlock(&sctx->stat_lock);
1014 if (__ratelimit(&_rs))
1015 scrub_print_warning("checksum error", sblock_to_check);
1016 btrfs_dev_stat_inc_and_print(dev,
1017 BTRFS_DEV_STAT_CORRUPTION_ERRS);
1018 } else if (sblock_bad->header_error) {
1019 spin_lock(&sctx->stat_lock);
1020 sctx->stat.verify_errors++;
1021 spin_unlock(&sctx->stat_lock);
1022 if (__ratelimit(&_rs))
1023 scrub_print_warning("checksum/header error",
1025 if (sblock_bad->generation_error)
1026 btrfs_dev_stat_inc_and_print(dev,
1027 BTRFS_DEV_STAT_GENERATION_ERRS);
1029 btrfs_dev_stat_inc_and_print(dev,
1030 BTRFS_DEV_STAT_CORRUPTION_ERRS);
1033 if (sctx->readonly) {
1034 ASSERT(!sctx->is_dev_replace);
1038 if (!is_metadata && !have_csum) {
1039 struct scrub_fixup_nodatasum *fixup_nodatasum;
1042 WARN_ON(sctx->is_dev_replace);
1045 * !is_metadata and !have_csum, this means that the data
1046 * might not be COW'ed, that it might be modified
1047 * concurrently. The general strategy to work on the
1048 * commit root does not help in the case when COW is not
1051 fixup_nodatasum = kzalloc(sizeof(*fixup_nodatasum), GFP_NOFS);
1052 if (!fixup_nodatasum)
1053 goto did_not_correct_error;
1054 fixup_nodatasum->sctx = sctx;
1055 fixup_nodatasum->dev = dev;
1056 fixup_nodatasum->logical = logical;
1057 fixup_nodatasum->root = fs_info->extent_root;
1058 fixup_nodatasum->mirror_num = failed_mirror_index + 1;
1059 scrub_pending_trans_workers_inc(sctx);
1060 btrfs_init_work(&fixup_nodatasum->work, btrfs_scrub_helper,
1061 scrub_fixup_nodatasum, NULL, NULL);
1062 btrfs_queue_work(fs_info->scrub_workers,
1063 &fixup_nodatasum->work);
1068 * now build and submit the bios for the other mirrors, check
1070 * First try to pick the mirror which is completely without I/O
1071 * errors and also does not have a checksum error.
1072 * If one is found, and if a checksum is present, the full block
1073 * that is known to contain an error is rewritten. Afterwards
1074 * the block is known to be corrected.
1075 * If a mirror is found which is completely correct, and no
1076 * checksum is present, only those pages are rewritten that had
1077 * an I/O error in the block to be repaired, since it cannot be
1078 * determined, which copy of the other pages is better (and it
1079 * could happen otherwise that a correct page would be
1080 * overwritten by a bad one).
1082 for (mirror_index = 0;
1083 mirror_index < BTRFS_MAX_MIRRORS &&
1084 sblocks_for_recheck[mirror_index].page_count > 0;
1086 struct scrub_block *sblock_other;
1088 if (mirror_index == failed_mirror_index)
1090 sblock_other = sblocks_for_recheck + mirror_index;
1092 /* build and submit the bios, check checksums */
1093 scrub_recheck_block(fs_info, sblock_other, is_metadata,
1094 have_csum, csum, generation,
1095 sctx->csum_size, 0);
1097 if (!sblock_other->header_error &&
1098 !sblock_other->checksum_error &&
1099 sblock_other->no_io_error_seen) {
1100 if (sctx->is_dev_replace) {
1101 scrub_write_block_to_dev_replace(sblock_other);
1103 int force_write = is_metadata || have_csum;
1105 ret = scrub_repair_block_from_good_copy(
1106 sblock_bad, sblock_other,
1110 goto corrected_error;
1115 * for dev_replace, pick good pages and write to the target device.
1117 if (sctx->is_dev_replace) {
1119 for (page_num = 0; page_num < sblock_bad->page_count;
1124 for (mirror_index = 0;
1125 mirror_index < BTRFS_MAX_MIRRORS &&
1126 sblocks_for_recheck[mirror_index].page_count > 0;
1128 struct scrub_block *sblock_other =
1129 sblocks_for_recheck + mirror_index;
1130 struct scrub_page *page_other =
1131 sblock_other->pagev[page_num];
1133 if (!page_other->io_error) {
1134 ret = scrub_write_page_to_dev_replace(
1135 sblock_other, page_num);
1137 /* succeeded for this page */
1141 btrfs_dev_replace_stats_inc(
1143 fs_info->dev_replace.
1151 * did not find a mirror to fetch the page
1152 * from. scrub_write_page_to_dev_replace()
1153 * handles this case (page->io_error), by
1154 * filling the block with zeros before
1155 * submitting the write request
1158 ret = scrub_write_page_to_dev_replace(
1159 sblock_bad, page_num);
1161 btrfs_dev_replace_stats_inc(
1162 &sctx->dev_root->fs_info->
1163 dev_replace.num_write_errors);
1171 * for regular scrub, repair those pages that are errored.
1172 * In case of I/O errors in the area that is supposed to be
1173 * repaired, continue by picking good copies of those pages.
1174 * Select the good pages from mirrors to rewrite bad pages from
1175 * the area to fix. Afterwards verify the checksum of the block
1176 * that is supposed to be repaired. This verification step is
1177 * only done for the purpose of statistic counting and for the
1178 * final scrub report, whether errors remain.
1179 * A perfect algorithm could make use of the checksum and try
1180 * all possible combinations of pages from the different mirrors
1181 * until the checksum verification succeeds. For example, when
1182 * the 2nd page of mirror #1 faces I/O errors, and the 2nd page
1183 * of mirror #2 is readable but the final checksum test fails,
1184 * then the 2nd page of mirror #3 could be tried, whether now
1185 * the final checksum succeedes. But this would be a rare
1186 * exception and is therefore not implemented. At least it is
1187 * avoided that the good copy is overwritten.
1188 * A more useful improvement would be to pick the sectors
1189 * without I/O error based on sector sizes (512 bytes on legacy
1190 * disks) instead of on PAGE_SIZE. Then maybe 512 byte of one
1191 * mirror could be repaired by taking 512 byte of a different
1192 * mirror, even if other 512 byte sectors in the same PAGE_SIZE
1193 * area are unreadable.
1196 /* can only fix I/O errors from here on */
1197 if (sblock_bad->no_io_error_seen)
1198 goto did_not_correct_error;
1201 for (page_num = 0; page_num < sblock_bad->page_count; page_num++) {
1202 struct scrub_page *page_bad = sblock_bad->pagev[page_num];
1204 if (!page_bad->io_error)
1207 for (mirror_index = 0;
1208 mirror_index < BTRFS_MAX_MIRRORS &&
1209 sblocks_for_recheck[mirror_index].page_count > 0;
1211 struct scrub_block *sblock_other = sblocks_for_recheck +
1213 struct scrub_page *page_other = sblock_other->pagev[
1216 if (!page_other->io_error) {
1217 ret = scrub_repair_page_from_good_copy(
1218 sblock_bad, sblock_other, page_num, 0);
1220 page_bad->io_error = 0;
1221 break; /* succeeded for this page */
1226 if (page_bad->io_error) {
1227 /* did not find a mirror to copy the page from */
1233 if (is_metadata || have_csum) {
1235 * need to verify the checksum now that all
1236 * sectors on disk are repaired (the write
1237 * request for data to be repaired is on its way).
1238 * Just be lazy and use scrub_recheck_block()
1239 * which re-reads the data before the checksum
1240 * is verified, but most likely the data comes out
1241 * of the page cache.
1243 scrub_recheck_block(fs_info, sblock_bad,
1244 is_metadata, have_csum, csum,
1245 generation, sctx->csum_size, 1);
1246 if (!sblock_bad->header_error &&
1247 !sblock_bad->checksum_error &&
1248 sblock_bad->no_io_error_seen)
1249 goto corrected_error;
1251 goto did_not_correct_error;
1254 spin_lock(&sctx->stat_lock);
1255 sctx->stat.corrected_errors++;
1256 sblock_to_check->data_corrected = 1;
1257 spin_unlock(&sctx->stat_lock);
1258 printk_ratelimited_in_rcu(KERN_ERR
1259 "BTRFS: fixed up error at logical %llu on dev %s\n",
1260 logical, rcu_str_deref(dev->name));
1263 did_not_correct_error:
1264 spin_lock(&sctx->stat_lock);
1265 sctx->stat.uncorrectable_errors++;
1266 spin_unlock(&sctx->stat_lock);
1267 printk_ratelimited_in_rcu(KERN_ERR
1268 "BTRFS: unable to fixup (regular) error at logical %llu on dev %s\n",
1269 logical, rcu_str_deref(dev->name));
1273 if (sblocks_for_recheck) {
1274 for (mirror_index = 0; mirror_index < BTRFS_MAX_MIRRORS;
1276 struct scrub_block *sblock = sblocks_for_recheck +
1278 struct scrub_recover *recover;
1281 for (page_index = 0; page_index < sblock->page_count;
1283 sblock->pagev[page_index]->sblock = NULL;
1284 recover = sblock->pagev[page_index]->recover;
1286 scrub_put_recover(recover);
1287 sblock->pagev[page_index]->recover =
1290 scrub_page_put(sblock->pagev[page_index]);
1293 kfree(sblocks_for_recheck);
1299 static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio, u64 *raid_map)
1302 int real_stripes = bbio->num_stripes - bbio->num_tgtdevs;
1304 if (raid_map[real_stripes - 1] == RAID6_Q_STRIPE)
1309 return (int)bbio->num_stripes;
1313 static inline void scrub_stripe_index_and_offset(u64 logical, u64 *raid_map,
1315 int nstripes, int mirror,
1323 for (i = 0; i < nstripes; i++) {
1324 if (raid_map[i] == RAID6_Q_STRIPE ||
1325 raid_map[i] == RAID5_P_STRIPE)
1328 if (logical >= raid_map[i] &&
1329 logical < raid_map[i] + mapped_length)
1334 *stripe_offset = logical - raid_map[i];
1336 /* The other RAID type */
1337 *stripe_index = mirror;
1342 static int scrub_setup_recheck_block(struct scrub_ctx *sctx,
1343 struct btrfs_fs_info *fs_info,
1344 struct scrub_block *original_sblock,
1345 u64 length, u64 logical,
1346 struct scrub_block *sblocks_for_recheck)
1348 struct scrub_recover *recover;
1349 struct btrfs_bio *bbio;
1361 * note: the two members ref_count and outstanding_pages
1362 * are not used (and not set) in the blocks that are used for
1363 * the recheck procedure
1367 while (length > 0) {
1368 sublen = min_t(u64, length, PAGE_SIZE);
1369 mapped_length = sublen;
1374 * with a length of PAGE_SIZE, each returned stripe
1375 * represents one mirror
1377 ret = btrfs_map_sblock(fs_info, REQ_GET_READ_MIRRORS, logical,
1378 &mapped_length, &bbio, 0, &raid_map);
1379 if (ret || !bbio || mapped_length < sublen) {
1385 recover = kzalloc(sizeof(struct scrub_recover), GFP_NOFS);
1392 atomic_set(&recover->refs, 1);
1393 recover->bbio = bbio;
1394 recover->raid_map = raid_map;
1395 recover->map_length = mapped_length;
1397 BUG_ON(page_index >= SCRUB_PAGES_PER_RD_BIO);
1399 nmirrors = scrub_nr_raid_mirrors(bbio, raid_map);
1400 for (mirror_index = 0; mirror_index < nmirrors;
1402 struct scrub_block *sblock;
1403 struct scrub_page *page;
1405 if (mirror_index >= BTRFS_MAX_MIRRORS)
1408 sblock = sblocks_for_recheck + mirror_index;
1409 sblock->sctx = sctx;
1410 page = kzalloc(sizeof(*page), GFP_NOFS);
1413 spin_lock(&sctx->stat_lock);
1414 sctx->stat.malloc_errors++;
1415 spin_unlock(&sctx->stat_lock);
1416 scrub_put_recover(recover);
1419 scrub_page_get(page);
1420 sblock->pagev[page_index] = page;
1421 page->logical = logical;
1423 scrub_stripe_index_and_offset(logical, raid_map,
1430 page->physical = bbio->stripes[stripe_index].physical +
1432 page->dev = bbio->stripes[stripe_index].dev;
1434 BUG_ON(page_index >= original_sblock->page_count);
1435 page->physical_for_dev_replace =
1436 original_sblock->pagev[page_index]->
1437 physical_for_dev_replace;
1438 /* for missing devices, dev->bdev is NULL */
1439 page->mirror_num = mirror_index + 1;
1440 sblock->page_count++;
1441 page->page = alloc_page(GFP_NOFS);
1445 scrub_get_recover(recover);
1446 page->recover = recover;
1448 scrub_put_recover(recover);
1457 struct scrub_bio_ret {
1458 struct completion event;
1462 static void scrub_bio_wait_endio(struct bio *bio, int error)
1464 struct scrub_bio_ret *ret = bio->bi_private;
1467 complete(&ret->event);
1470 static inline int scrub_is_page_on_raid56(struct scrub_page *page)
1472 return page->recover && page->recover->raid_map;
1475 static int scrub_submit_raid56_bio_wait(struct btrfs_fs_info *fs_info,
1477 struct scrub_page *page)
1479 struct scrub_bio_ret done;
1482 init_completion(&done.event);
1484 bio->bi_iter.bi_sector = page->logical >> 9;
1485 bio->bi_private = &done;
1486 bio->bi_end_io = scrub_bio_wait_endio;
1488 ret = raid56_parity_recover(fs_info->fs_root, bio, page->recover->bbio,
1489 page->recover->raid_map,
1490 page->recover->map_length,
1491 page->mirror_num, 0);
1495 wait_for_completion(&done.event);
1503 * this function will check the on disk data for checksum errors, header
1504 * errors and read I/O errors. If any I/O errors happen, the exact pages
1505 * which are errored are marked as being bad. The goal is to enable scrub
1506 * to take those pages that are not errored from all the mirrors so that
1507 * the pages that are errored in the just handled mirror can be repaired.
1509 static void scrub_recheck_block(struct btrfs_fs_info *fs_info,
1510 struct scrub_block *sblock, int is_metadata,
1511 int have_csum, u8 *csum, u64 generation,
1512 u16 csum_size, int retry_failed_mirror)
1516 sblock->no_io_error_seen = 1;
1517 sblock->header_error = 0;
1518 sblock->checksum_error = 0;
1520 for (page_num = 0; page_num < sblock->page_count; page_num++) {
1522 struct scrub_page *page = sblock->pagev[page_num];
1524 if (page->dev->bdev == NULL) {
1526 sblock->no_io_error_seen = 0;
1530 WARN_ON(!page->page);
1531 bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
1534 sblock->no_io_error_seen = 0;
1537 bio->bi_bdev = page->dev->bdev;
1539 bio_add_page(bio, page->page, PAGE_SIZE, 0);
1540 if (!retry_failed_mirror && scrub_is_page_on_raid56(page)) {
1541 if (scrub_submit_raid56_bio_wait(fs_info, bio, page))
1542 sblock->no_io_error_seen = 0;
1544 bio->bi_iter.bi_sector = page->physical >> 9;
1546 if (btrfsic_submit_bio_wait(READ, bio))
1547 sblock->no_io_error_seen = 0;
1553 if (sblock->no_io_error_seen)
1554 scrub_recheck_block_checksum(fs_info, sblock, is_metadata,
1555 have_csum, csum, generation,
1561 static inline int scrub_check_fsid(u8 fsid[],
1562 struct scrub_page *spage)
1564 struct btrfs_fs_devices *fs_devices = spage->dev->fs_devices;
1567 ret = memcmp(fsid, fs_devices->fsid, BTRFS_UUID_SIZE);
1571 static void scrub_recheck_block_checksum(struct btrfs_fs_info *fs_info,
1572 struct scrub_block *sblock,
1573 int is_metadata, int have_csum,
1574 const u8 *csum, u64 generation,
1578 u8 calculated_csum[BTRFS_CSUM_SIZE];
1580 void *mapped_buffer;
1582 WARN_ON(!sblock->pagev[0]->page);
1584 struct btrfs_header *h;
1586 mapped_buffer = kmap_atomic(sblock->pagev[0]->page);
1587 h = (struct btrfs_header *)mapped_buffer;
1589 if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h) ||
1590 !scrub_check_fsid(h->fsid, sblock->pagev[0]) ||
1591 memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
1593 sblock->header_error = 1;
1594 } else if (generation != btrfs_stack_header_generation(h)) {
1595 sblock->header_error = 1;
1596 sblock->generation_error = 1;
1603 mapped_buffer = kmap_atomic(sblock->pagev[0]->page);
1606 for (page_num = 0;;) {
1607 if (page_num == 0 && is_metadata)
1608 crc = btrfs_csum_data(
1609 ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE,
1610 crc, PAGE_SIZE - BTRFS_CSUM_SIZE);
1612 crc = btrfs_csum_data(mapped_buffer, crc, PAGE_SIZE);
1614 kunmap_atomic(mapped_buffer);
1616 if (page_num >= sblock->page_count)
1618 WARN_ON(!sblock->pagev[page_num]->page);
1620 mapped_buffer = kmap_atomic(sblock->pagev[page_num]->page);
1623 btrfs_csum_final(crc, calculated_csum);
1624 if (memcmp(calculated_csum, csum, csum_size))
1625 sblock->checksum_error = 1;
1628 static int scrub_repair_block_from_good_copy(struct scrub_block *sblock_bad,
1629 struct scrub_block *sblock_good,
1635 for (page_num = 0; page_num < sblock_bad->page_count; page_num++) {
1638 ret_sub = scrub_repair_page_from_good_copy(sblock_bad,
1649 static int scrub_repair_page_from_good_copy(struct scrub_block *sblock_bad,
1650 struct scrub_block *sblock_good,
1651 int page_num, int force_write)
1653 struct scrub_page *page_bad = sblock_bad->pagev[page_num];
1654 struct scrub_page *page_good = sblock_good->pagev[page_num];
1656 BUG_ON(page_bad->page == NULL);
1657 BUG_ON(page_good->page == NULL);
1658 if (force_write || sblock_bad->header_error ||
1659 sblock_bad->checksum_error || page_bad->io_error) {
1663 if (!page_bad->dev->bdev) {
1664 printk_ratelimited(KERN_WARNING "BTRFS: "
1665 "scrub_repair_page_from_good_copy(bdev == NULL) "
1666 "is unexpected!\n");
1670 bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
1673 bio->bi_bdev = page_bad->dev->bdev;
1674 bio->bi_iter.bi_sector = page_bad->physical >> 9;
1676 ret = bio_add_page(bio, page_good->page, PAGE_SIZE, 0);
1677 if (PAGE_SIZE != ret) {
1682 if (btrfsic_submit_bio_wait(WRITE, bio)) {
1683 btrfs_dev_stat_inc_and_print(page_bad->dev,
1684 BTRFS_DEV_STAT_WRITE_ERRS);
1685 btrfs_dev_replace_stats_inc(
1686 &sblock_bad->sctx->dev_root->fs_info->
1687 dev_replace.num_write_errors);
1697 static void scrub_write_block_to_dev_replace(struct scrub_block *sblock)
1702 * This block is used for the check of the parity on the source device,
1703 * so the data needn't be written into the destination device.
1705 if (sblock->sparity)
1708 for (page_num = 0; page_num < sblock->page_count; page_num++) {
1711 ret = scrub_write_page_to_dev_replace(sblock, page_num);
1713 btrfs_dev_replace_stats_inc(
1714 &sblock->sctx->dev_root->fs_info->dev_replace.
1719 static int scrub_write_page_to_dev_replace(struct scrub_block *sblock,
1722 struct scrub_page *spage = sblock->pagev[page_num];
1724 BUG_ON(spage->page == NULL);
1725 if (spage->io_error) {
1726 void *mapped_buffer = kmap_atomic(spage->page);
1728 memset(mapped_buffer, 0, PAGE_CACHE_SIZE);
1729 flush_dcache_page(spage->page);
1730 kunmap_atomic(mapped_buffer);
1732 return scrub_add_page_to_wr_bio(sblock->sctx, spage);
1735 static int scrub_add_page_to_wr_bio(struct scrub_ctx *sctx,
1736 struct scrub_page *spage)
1738 struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx;
1739 struct scrub_bio *sbio;
1742 mutex_lock(&wr_ctx->wr_lock);
1744 if (!wr_ctx->wr_curr_bio) {
1745 wr_ctx->wr_curr_bio = kzalloc(sizeof(*wr_ctx->wr_curr_bio),
1747 if (!wr_ctx->wr_curr_bio) {
1748 mutex_unlock(&wr_ctx->wr_lock);
1751 wr_ctx->wr_curr_bio->sctx = sctx;
1752 wr_ctx->wr_curr_bio->page_count = 0;
1754 sbio = wr_ctx->wr_curr_bio;
1755 if (sbio->page_count == 0) {
1758 sbio->physical = spage->physical_for_dev_replace;
1759 sbio->logical = spage->logical;
1760 sbio->dev = wr_ctx->tgtdev;
1763 bio = btrfs_io_bio_alloc(GFP_NOFS, wr_ctx->pages_per_wr_bio);
1765 mutex_unlock(&wr_ctx->wr_lock);
1771 bio->bi_private = sbio;
1772 bio->bi_end_io = scrub_wr_bio_end_io;
1773 bio->bi_bdev = sbio->dev->bdev;
1774 bio->bi_iter.bi_sector = sbio->physical >> 9;
1776 } else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
1777 spage->physical_for_dev_replace ||
1778 sbio->logical + sbio->page_count * PAGE_SIZE !=
1780 scrub_wr_submit(sctx);
1784 ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
1785 if (ret != PAGE_SIZE) {
1786 if (sbio->page_count < 1) {
1789 mutex_unlock(&wr_ctx->wr_lock);
1792 scrub_wr_submit(sctx);
1796 sbio->pagev[sbio->page_count] = spage;
1797 scrub_page_get(spage);
1799 if (sbio->page_count == wr_ctx->pages_per_wr_bio)
1800 scrub_wr_submit(sctx);
1801 mutex_unlock(&wr_ctx->wr_lock);
1806 static void scrub_wr_submit(struct scrub_ctx *sctx)
1808 struct scrub_wr_ctx *wr_ctx = &sctx->wr_ctx;
1809 struct scrub_bio *sbio;
1811 if (!wr_ctx->wr_curr_bio)
1814 sbio = wr_ctx->wr_curr_bio;
1815 wr_ctx->wr_curr_bio = NULL;
1816 WARN_ON(!sbio->bio->bi_bdev);
1817 scrub_pending_bio_inc(sctx);
1818 /* process all writes in a single worker thread. Then the block layer
1819 * orders the requests before sending them to the driver which
1820 * doubled the write performance on spinning disks when measured
1822 btrfsic_submit_bio(WRITE, sbio->bio);
1825 static void scrub_wr_bio_end_io(struct bio *bio, int err)
1827 struct scrub_bio *sbio = bio->bi_private;
1828 struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
1833 btrfs_init_work(&sbio->work, btrfs_scrubwrc_helper,
1834 scrub_wr_bio_end_io_worker, NULL, NULL);
1835 btrfs_queue_work(fs_info->scrub_wr_completion_workers, &sbio->work);
1838 static void scrub_wr_bio_end_io_worker(struct btrfs_work *work)
1840 struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
1841 struct scrub_ctx *sctx = sbio->sctx;
1844 WARN_ON(sbio->page_count > SCRUB_PAGES_PER_WR_BIO);
1846 struct btrfs_dev_replace *dev_replace =
1847 &sbio->sctx->dev_root->fs_info->dev_replace;
1849 for (i = 0; i < sbio->page_count; i++) {
1850 struct scrub_page *spage = sbio->pagev[i];
1852 spage->io_error = 1;
1853 btrfs_dev_replace_stats_inc(&dev_replace->
1858 for (i = 0; i < sbio->page_count; i++)
1859 scrub_page_put(sbio->pagev[i]);
1863 scrub_pending_bio_dec(sctx);
1866 static int scrub_checksum(struct scrub_block *sblock)
1871 WARN_ON(sblock->page_count < 1);
1872 flags = sblock->pagev[0]->flags;
1874 if (flags & BTRFS_EXTENT_FLAG_DATA)
1875 ret = scrub_checksum_data(sblock);
1876 else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)
1877 ret = scrub_checksum_tree_block(sblock);
1878 else if (flags & BTRFS_EXTENT_FLAG_SUPER)
1879 (void)scrub_checksum_super(sblock);
1883 scrub_handle_errored_block(sblock);
1888 static int scrub_checksum_data(struct scrub_block *sblock)
1890 struct scrub_ctx *sctx = sblock->sctx;
1891 u8 csum[BTRFS_CSUM_SIZE];
1900 BUG_ON(sblock->page_count < 1);
1901 if (!sblock->pagev[0]->have_csum)
1904 on_disk_csum = sblock->pagev[0]->csum;
1905 page = sblock->pagev[0]->page;
1906 buffer = kmap_atomic(page);
1908 len = sctx->sectorsize;
1911 u64 l = min_t(u64, len, PAGE_SIZE);
1913 crc = btrfs_csum_data(buffer, crc, l);
1914 kunmap_atomic(buffer);
1919 BUG_ON(index >= sblock->page_count);
1920 BUG_ON(!sblock->pagev[index]->page);
1921 page = sblock->pagev[index]->page;
1922 buffer = kmap_atomic(page);
1925 btrfs_csum_final(crc, csum);
1926 if (memcmp(csum, on_disk_csum, sctx->csum_size))
1932 static int scrub_checksum_tree_block(struct scrub_block *sblock)
1934 struct scrub_ctx *sctx = sblock->sctx;
1935 struct btrfs_header *h;
1936 struct btrfs_root *root = sctx->dev_root;
1937 struct btrfs_fs_info *fs_info = root->fs_info;
1938 u8 calculated_csum[BTRFS_CSUM_SIZE];
1939 u8 on_disk_csum[BTRFS_CSUM_SIZE];
1941 void *mapped_buffer;
1950 BUG_ON(sblock->page_count < 1);
1951 page = sblock->pagev[0]->page;
1952 mapped_buffer = kmap_atomic(page);
1953 h = (struct btrfs_header *)mapped_buffer;
1954 memcpy(on_disk_csum, h->csum, sctx->csum_size);
1957 * we don't use the getter functions here, as we
1958 * a) don't have an extent buffer and
1959 * b) the page is already kmapped
1962 if (sblock->pagev[0]->logical != btrfs_stack_header_bytenr(h))
1965 if (sblock->pagev[0]->generation != btrfs_stack_header_generation(h))
1968 if (!scrub_check_fsid(h->fsid, sblock->pagev[0]))
1971 if (memcmp(h->chunk_tree_uuid, fs_info->chunk_tree_uuid,
1975 len = sctx->nodesize - BTRFS_CSUM_SIZE;
1976 mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
1977 p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE;
1980 u64 l = min_t(u64, len, mapped_size);
1982 crc = btrfs_csum_data(p, crc, l);
1983 kunmap_atomic(mapped_buffer);
1988 BUG_ON(index >= sblock->page_count);
1989 BUG_ON(!sblock->pagev[index]->page);
1990 page = sblock->pagev[index]->page;
1991 mapped_buffer = kmap_atomic(page);
1992 mapped_size = PAGE_SIZE;
1996 btrfs_csum_final(crc, calculated_csum);
1997 if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
2000 return fail || crc_fail;
2003 static int scrub_checksum_super(struct scrub_block *sblock)
2005 struct btrfs_super_block *s;
2006 struct scrub_ctx *sctx = sblock->sctx;
2007 u8 calculated_csum[BTRFS_CSUM_SIZE];
2008 u8 on_disk_csum[BTRFS_CSUM_SIZE];
2010 void *mapped_buffer;
2019 BUG_ON(sblock->page_count < 1);
2020 page = sblock->pagev[0]->page;
2021 mapped_buffer = kmap_atomic(page);
2022 s = (struct btrfs_super_block *)mapped_buffer;
2023 memcpy(on_disk_csum, s->csum, sctx->csum_size);
2025 if (sblock->pagev[0]->logical != btrfs_super_bytenr(s))
2028 if (sblock->pagev[0]->generation != btrfs_super_generation(s))
2031 if (!scrub_check_fsid(s->fsid, sblock->pagev[0]))
2034 len = BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE;
2035 mapped_size = PAGE_SIZE - BTRFS_CSUM_SIZE;
2036 p = ((u8 *)mapped_buffer) + BTRFS_CSUM_SIZE;
2039 u64 l = min_t(u64, len, mapped_size);
2041 crc = btrfs_csum_data(p, crc, l);
2042 kunmap_atomic(mapped_buffer);
2047 BUG_ON(index >= sblock->page_count);
2048 BUG_ON(!sblock->pagev[index]->page);
2049 page = sblock->pagev[index]->page;
2050 mapped_buffer = kmap_atomic(page);
2051 mapped_size = PAGE_SIZE;
2055 btrfs_csum_final(crc, calculated_csum);
2056 if (memcmp(calculated_csum, on_disk_csum, sctx->csum_size))
2059 if (fail_cor + fail_gen) {
2061 * if we find an error in a super block, we just report it.
2062 * They will get written with the next transaction commit
2065 spin_lock(&sctx->stat_lock);
2066 ++sctx->stat.super_errors;
2067 spin_unlock(&sctx->stat_lock);
2069 btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev,
2070 BTRFS_DEV_STAT_CORRUPTION_ERRS);
2072 btrfs_dev_stat_inc_and_print(sblock->pagev[0]->dev,
2073 BTRFS_DEV_STAT_GENERATION_ERRS);
2076 return fail_cor + fail_gen;
2079 static void scrub_block_get(struct scrub_block *sblock)
2081 atomic_inc(&sblock->ref_count);
2084 static void scrub_block_put(struct scrub_block *sblock)
2086 if (atomic_dec_and_test(&sblock->ref_count)) {
2089 if (sblock->sparity)
2090 scrub_parity_put(sblock->sparity);
2092 for (i = 0; i < sblock->page_count; i++)
2093 scrub_page_put(sblock->pagev[i]);
2098 static void scrub_page_get(struct scrub_page *spage)
2100 atomic_inc(&spage->ref_count);
2103 static void scrub_page_put(struct scrub_page *spage)
2105 if (atomic_dec_and_test(&spage->ref_count)) {
2107 __free_page(spage->page);
2112 static void scrub_submit(struct scrub_ctx *sctx)
2114 struct scrub_bio *sbio;
2116 if (sctx->curr == -1)
2119 sbio = sctx->bios[sctx->curr];
2121 scrub_pending_bio_inc(sctx);
2123 if (!sbio->bio->bi_bdev) {
2125 * this case should not happen. If btrfs_map_block() is
2126 * wrong, it could happen for dev-replace operations on
2127 * missing devices when no mirrors are available, but in
2128 * this case it should already fail the mount.
2129 * This case is handled correctly (but _very_ slowly).
2131 printk_ratelimited(KERN_WARNING
2132 "BTRFS: scrub_submit(bio bdev == NULL) is unexpected!\n");
2133 bio_endio(sbio->bio, -EIO);
2135 btrfsic_submit_bio(READ, sbio->bio);
2139 static int scrub_add_page_to_rd_bio(struct scrub_ctx *sctx,
2140 struct scrub_page *spage)
2142 struct scrub_block *sblock = spage->sblock;
2143 struct scrub_bio *sbio;
2148 * grab a fresh bio or wait for one to become available
2150 while (sctx->curr == -1) {
2151 spin_lock(&sctx->list_lock);
2152 sctx->curr = sctx->first_free;
2153 if (sctx->curr != -1) {
2154 sctx->first_free = sctx->bios[sctx->curr]->next_free;
2155 sctx->bios[sctx->curr]->next_free = -1;
2156 sctx->bios[sctx->curr]->page_count = 0;
2157 spin_unlock(&sctx->list_lock);
2159 spin_unlock(&sctx->list_lock);
2160 wait_event(sctx->list_wait, sctx->first_free != -1);
2163 sbio = sctx->bios[sctx->curr];
2164 if (sbio->page_count == 0) {
2167 sbio->physical = spage->physical;
2168 sbio->logical = spage->logical;
2169 sbio->dev = spage->dev;
2172 bio = btrfs_io_bio_alloc(GFP_NOFS, sctx->pages_per_rd_bio);
2178 bio->bi_private = sbio;
2179 bio->bi_end_io = scrub_bio_end_io;
2180 bio->bi_bdev = sbio->dev->bdev;
2181 bio->bi_iter.bi_sector = sbio->physical >> 9;
2183 } else if (sbio->physical + sbio->page_count * PAGE_SIZE !=
2185 sbio->logical + sbio->page_count * PAGE_SIZE !=
2187 sbio->dev != spage->dev) {
2192 sbio->pagev[sbio->page_count] = spage;
2193 ret = bio_add_page(sbio->bio, spage->page, PAGE_SIZE, 0);
2194 if (ret != PAGE_SIZE) {
2195 if (sbio->page_count < 1) {
2204 scrub_block_get(sblock); /* one for the page added to the bio */
2205 atomic_inc(&sblock->outstanding_pages);
2207 if (sbio->page_count == sctx->pages_per_rd_bio)
2213 static int scrub_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
2214 u64 physical, struct btrfs_device *dev, u64 flags,
2215 u64 gen, int mirror_num, u8 *csum, int force,
2216 u64 physical_for_dev_replace)
2218 struct scrub_block *sblock;
2221 sblock = kzalloc(sizeof(*sblock), GFP_NOFS);
2223 spin_lock(&sctx->stat_lock);
2224 sctx->stat.malloc_errors++;
2225 spin_unlock(&sctx->stat_lock);
2229 /* one ref inside this function, plus one for each page added to
2231 atomic_set(&sblock->ref_count, 1);
2232 sblock->sctx = sctx;
2233 sblock->no_io_error_seen = 1;
2235 for (index = 0; len > 0; index++) {
2236 struct scrub_page *spage;
2237 u64 l = min_t(u64, len, PAGE_SIZE);
2239 spage = kzalloc(sizeof(*spage), GFP_NOFS);
2242 spin_lock(&sctx->stat_lock);
2243 sctx->stat.malloc_errors++;
2244 spin_unlock(&sctx->stat_lock);
2245 scrub_block_put(sblock);
2248 BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
2249 scrub_page_get(spage);
2250 sblock->pagev[index] = spage;
2251 spage->sblock = sblock;
2253 spage->flags = flags;
2254 spage->generation = gen;
2255 spage->logical = logical;
2256 spage->physical = physical;
2257 spage->physical_for_dev_replace = physical_for_dev_replace;
2258 spage->mirror_num = mirror_num;
2260 spage->have_csum = 1;
2261 memcpy(spage->csum, csum, sctx->csum_size);
2263 spage->have_csum = 0;
2265 sblock->page_count++;
2266 spage->page = alloc_page(GFP_NOFS);
2272 physical_for_dev_replace += l;
2275 WARN_ON(sblock->page_count == 0);
2276 for (index = 0; index < sblock->page_count; index++) {
2277 struct scrub_page *spage = sblock->pagev[index];
2280 ret = scrub_add_page_to_rd_bio(sctx, spage);
2282 scrub_block_put(sblock);
2290 /* last one frees, either here or in bio completion for last page */
2291 scrub_block_put(sblock);
2295 static void scrub_bio_end_io(struct bio *bio, int err)
2297 struct scrub_bio *sbio = bio->bi_private;
2298 struct btrfs_fs_info *fs_info = sbio->dev->dev_root->fs_info;
2303 btrfs_queue_work(fs_info->scrub_workers, &sbio->work);
2306 static void scrub_bio_end_io_worker(struct btrfs_work *work)
2308 struct scrub_bio *sbio = container_of(work, struct scrub_bio, work);
2309 struct scrub_ctx *sctx = sbio->sctx;
2312 BUG_ON(sbio->page_count > SCRUB_PAGES_PER_RD_BIO);
2314 for (i = 0; i < sbio->page_count; i++) {
2315 struct scrub_page *spage = sbio->pagev[i];
2317 spage->io_error = 1;
2318 spage->sblock->no_io_error_seen = 0;
2322 /* now complete the scrub_block items that have all pages completed */
2323 for (i = 0; i < sbio->page_count; i++) {
2324 struct scrub_page *spage = sbio->pagev[i];
2325 struct scrub_block *sblock = spage->sblock;
2327 if (atomic_dec_and_test(&sblock->outstanding_pages))
2328 scrub_block_complete(sblock);
2329 scrub_block_put(sblock);
2334 spin_lock(&sctx->list_lock);
2335 sbio->next_free = sctx->first_free;
2336 sctx->first_free = sbio->index;
2337 spin_unlock(&sctx->list_lock);
2339 if (sctx->is_dev_replace &&
2340 atomic_read(&sctx->wr_ctx.flush_all_writes)) {
2341 mutex_lock(&sctx->wr_ctx.wr_lock);
2342 scrub_wr_submit(sctx);
2343 mutex_unlock(&sctx->wr_ctx.wr_lock);
2346 scrub_pending_bio_dec(sctx);
2349 static inline void __scrub_mark_bitmap(struct scrub_parity *sparity,
2350 unsigned long *bitmap,
2355 int sectorsize = sparity->sctx->dev_root->sectorsize;
2357 if (len >= sparity->stripe_len) {
2358 bitmap_set(bitmap, 0, sparity->nsectors);
2362 start -= sparity->logic_start;
2363 offset = (int)do_div(start, sparity->stripe_len);
2364 offset /= sectorsize;
2365 nsectors = (int)len / sectorsize;
2367 if (offset + nsectors <= sparity->nsectors) {
2368 bitmap_set(bitmap, offset, nsectors);
2372 bitmap_set(bitmap, offset, sparity->nsectors - offset);
2373 bitmap_set(bitmap, 0, nsectors - (sparity->nsectors - offset));
2376 static inline void scrub_parity_mark_sectors_error(struct scrub_parity *sparity,
2379 __scrub_mark_bitmap(sparity, sparity->ebitmap, start, len);
2382 static inline void scrub_parity_mark_sectors_data(struct scrub_parity *sparity,
2385 __scrub_mark_bitmap(sparity, sparity->dbitmap, start, len);
2388 static void scrub_block_complete(struct scrub_block *sblock)
2392 if (!sblock->no_io_error_seen) {
2394 scrub_handle_errored_block(sblock);
2397 * if has checksum error, write via repair mechanism in
2398 * dev replace case, otherwise write here in dev replace
2401 corrupted = scrub_checksum(sblock);
2402 if (!corrupted && sblock->sctx->is_dev_replace)
2403 scrub_write_block_to_dev_replace(sblock);
2406 if (sblock->sparity && corrupted && !sblock->data_corrected) {
2407 u64 start = sblock->pagev[0]->logical;
2408 u64 end = sblock->pagev[sblock->page_count - 1]->logical +
2411 scrub_parity_mark_sectors_error(sblock->sparity,
2412 start, end - start);
2416 static int scrub_find_csum(struct scrub_ctx *sctx, u64 logical, u64 len,
2419 struct btrfs_ordered_sum *sum = NULL;
2420 unsigned long index;
2421 unsigned long num_sectors;
2423 while (!list_empty(&sctx->csum_list)) {
2424 sum = list_first_entry(&sctx->csum_list,
2425 struct btrfs_ordered_sum, list);
2426 if (sum->bytenr > logical)
2428 if (sum->bytenr + sum->len > logical)
2431 ++sctx->stat.csum_discards;
2432 list_del(&sum->list);
2439 index = ((u32)(logical - sum->bytenr)) / sctx->sectorsize;
2440 num_sectors = sum->len / sctx->sectorsize;
2441 memcpy(csum, sum->sums + index, sctx->csum_size);
2442 if (index == num_sectors - 1) {
2443 list_del(&sum->list);
2449 /* scrub extent tries to collect up to 64 kB for each bio */
2450 static int scrub_extent(struct scrub_ctx *sctx, u64 logical, u64 len,
2451 u64 physical, struct btrfs_device *dev, u64 flags,
2452 u64 gen, int mirror_num, u64 physical_for_dev_replace)
2455 u8 csum[BTRFS_CSUM_SIZE];
2458 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2459 blocksize = sctx->sectorsize;
2460 spin_lock(&sctx->stat_lock);
2461 sctx->stat.data_extents_scrubbed++;
2462 sctx->stat.data_bytes_scrubbed += len;
2463 spin_unlock(&sctx->stat_lock);
2464 } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
2465 blocksize = sctx->nodesize;
2466 spin_lock(&sctx->stat_lock);
2467 sctx->stat.tree_extents_scrubbed++;
2468 sctx->stat.tree_bytes_scrubbed += len;
2469 spin_unlock(&sctx->stat_lock);
2471 blocksize = sctx->sectorsize;
2476 u64 l = min_t(u64, len, blocksize);
2479 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2480 /* push csums to sbio */
2481 have_csum = scrub_find_csum(sctx, logical, l, csum);
2483 ++sctx->stat.no_csum;
2484 if (sctx->is_dev_replace && !have_csum) {
2485 ret = copy_nocow_pages(sctx, logical, l,
2487 physical_for_dev_replace);
2488 goto behind_scrub_pages;
2491 ret = scrub_pages(sctx, logical, l, physical, dev, flags, gen,
2492 mirror_num, have_csum ? csum : NULL, 0,
2493 physical_for_dev_replace);
2500 physical_for_dev_replace += l;
2505 static int scrub_pages_for_parity(struct scrub_parity *sparity,
2506 u64 logical, u64 len,
2507 u64 physical, struct btrfs_device *dev,
2508 u64 flags, u64 gen, int mirror_num, u8 *csum)
2510 struct scrub_ctx *sctx = sparity->sctx;
2511 struct scrub_block *sblock;
2514 sblock = kzalloc(sizeof(*sblock), GFP_NOFS);
2516 spin_lock(&sctx->stat_lock);
2517 sctx->stat.malloc_errors++;
2518 spin_unlock(&sctx->stat_lock);
2522 /* one ref inside this function, plus one for each page added to
2524 atomic_set(&sblock->ref_count, 1);
2525 sblock->sctx = sctx;
2526 sblock->no_io_error_seen = 1;
2527 sblock->sparity = sparity;
2528 scrub_parity_get(sparity);
2530 for (index = 0; len > 0; index++) {
2531 struct scrub_page *spage;
2532 u64 l = min_t(u64, len, PAGE_SIZE);
2534 spage = kzalloc(sizeof(*spage), GFP_NOFS);
2537 spin_lock(&sctx->stat_lock);
2538 sctx->stat.malloc_errors++;
2539 spin_unlock(&sctx->stat_lock);
2540 scrub_block_put(sblock);
2543 BUG_ON(index >= SCRUB_MAX_PAGES_PER_BLOCK);
2544 /* For scrub block */
2545 scrub_page_get(spage);
2546 sblock->pagev[index] = spage;
2547 /* For scrub parity */
2548 scrub_page_get(spage);
2549 list_add_tail(&spage->list, &sparity->spages);
2550 spage->sblock = sblock;
2552 spage->flags = flags;
2553 spage->generation = gen;
2554 spage->logical = logical;
2555 spage->physical = physical;
2556 spage->mirror_num = mirror_num;
2558 spage->have_csum = 1;
2559 memcpy(spage->csum, csum, sctx->csum_size);
2561 spage->have_csum = 0;
2563 sblock->page_count++;
2564 spage->page = alloc_page(GFP_NOFS);
2572 WARN_ON(sblock->page_count == 0);
2573 for (index = 0; index < sblock->page_count; index++) {
2574 struct scrub_page *spage = sblock->pagev[index];
2577 ret = scrub_add_page_to_rd_bio(sctx, spage);
2579 scrub_block_put(sblock);
2584 /* last one frees, either here or in bio completion for last page */
2585 scrub_block_put(sblock);
2589 static int scrub_extent_for_parity(struct scrub_parity *sparity,
2590 u64 logical, u64 len,
2591 u64 physical, struct btrfs_device *dev,
2592 u64 flags, u64 gen, int mirror_num)
2594 struct scrub_ctx *sctx = sparity->sctx;
2596 u8 csum[BTRFS_CSUM_SIZE];
2599 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2600 blocksize = sctx->sectorsize;
2601 } else if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
2602 blocksize = sctx->nodesize;
2604 blocksize = sctx->sectorsize;
2609 u64 l = min_t(u64, len, blocksize);
2612 if (flags & BTRFS_EXTENT_FLAG_DATA) {
2613 /* push csums to sbio */
2614 have_csum = scrub_find_csum(sctx, logical, l, csum);
2618 ret = scrub_pages_for_parity(sparity, logical, l, physical, dev,
2619 flags, gen, mirror_num,
2620 have_csum ? csum : NULL);
2632 * Given a physical address, this will calculate it's
2633 * logical offset. if this is a parity stripe, it will return
2634 * the most left data stripe's logical offset.
2636 * return 0 if it is a data stripe, 1 means parity stripe.
2638 static int get_raid56_logic_offset(u64 physical, int num,
2639 struct map_lookup *map, u64 *offset,
2649 last_offset = (physical - map->stripes[num].physical) *
2650 nr_data_stripes(map);
2652 *stripe_start = last_offset;
2654 *offset = last_offset;
2655 for (i = 0; i < nr_data_stripes(map); i++) {
2656 *offset = last_offset + i * map->stripe_len;
2658 stripe_nr = *offset;
2659 do_div(stripe_nr, map->stripe_len);
2660 do_div(stripe_nr, nr_data_stripes(map));
2662 /* Work out the disk rotation on this stripe-set */
2663 rot = do_div(stripe_nr, map->num_stripes);
2664 /* calculate which stripe this data locates */
2666 stripe_index = rot % map->num_stripes;
2667 if (stripe_index == num)
2669 if (stripe_index < num)
2672 *offset = last_offset + j * map->stripe_len;
2676 static void scrub_free_parity(struct scrub_parity *sparity)
2678 struct scrub_ctx *sctx = sparity->sctx;
2679 struct scrub_page *curr, *next;
2682 nbits = bitmap_weight(sparity->ebitmap, sparity->nsectors);
2684 spin_lock(&sctx->stat_lock);
2685 sctx->stat.read_errors += nbits;
2686 sctx->stat.uncorrectable_errors += nbits;
2687 spin_unlock(&sctx->stat_lock);
2690 list_for_each_entry_safe(curr, next, &sparity->spages, list) {
2691 list_del_init(&curr->list);
2692 scrub_page_put(curr);
2698 static void scrub_parity_bio_endio(struct bio *bio, int error)
2700 struct scrub_parity *sparity = (struct scrub_parity *)bio->bi_private;
2701 struct scrub_ctx *sctx = sparity->sctx;
2704 bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
2707 scrub_free_parity(sparity);
2708 scrub_pending_bio_dec(sctx);
2712 static void scrub_parity_check_and_repair(struct scrub_parity *sparity)
2714 struct scrub_ctx *sctx = sparity->sctx;
2716 struct btrfs_raid_bio *rbio;
2717 struct scrub_page *spage;
2718 struct btrfs_bio *bbio = NULL;
2719 u64 *raid_map = NULL;
2723 if (!bitmap_andnot(sparity->dbitmap, sparity->dbitmap, sparity->ebitmap,
2727 length = sparity->logic_end - sparity->logic_start + 1;
2728 ret = btrfs_map_sblock(sctx->dev_root->fs_info, WRITE,
2729 sparity->logic_start,
2730 &length, &bbio, 0, &raid_map);
2731 if (ret || !bbio || !raid_map)
2734 bio = btrfs_io_bio_alloc(GFP_NOFS, 0);
2738 bio->bi_iter.bi_sector = sparity->logic_start >> 9;
2739 bio->bi_private = sparity;
2740 bio->bi_end_io = scrub_parity_bio_endio;
2742 rbio = raid56_parity_alloc_scrub_rbio(sctx->dev_root, bio, bbio,
2750 list_for_each_entry(spage, &sparity->spages, list)
2751 raid56_parity_add_scrub_pages(rbio, spage->page,
2754 scrub_pending_bio_inc(sctx);
2755 raid56_parity_submit_scrub_rbio(rbio);
2763 bitmap_or(sparity->ebitmap, sparity->ebitmap, sparity->dbitmap,
2765 spin_lock(&sctx->stat_lock);
2766 sctx->stat.malloc_errors++;
2767 spin_unlock(&sctx->stat_lock);
2769 scrub_free_parity(sparity);
2772 static inline int scrub_calc_parity_bitmap_len(int nsectors)
2774 return DIV_ROUND_UP(nsectors, BITS_PER_LONG) * (BITS_PER_LONG / 8);
2777 static void scrub_parity_get(struct scrub_parity *sparity)
2779 atomic_inc(&sparity->ref_count);
2782 static void scrub_parity_put(struct scrub_parity *sparity)
2784 if (!atomic_dec_and_test(&sparity->ref_count))
2787 scrub_parity_check_and_repair(sparity);
2790 static noinline_for_stack int scrub_raid56_parity(struct scrub_ctx *sctx,
2791 struct map_lookup *map,
2792 struct btrfs_device *sdev,
2793 struct btrfs_path *path,
2797 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
2798 struct btrfs_root *root = fs_info->extent_root;
2799 struct btrfs_root *csum_root = fs_info->csum_root;
2800 struct btrfs_extent_item *extent;
2804 struct extent_buffer *l;
2805 struct btrfs_key key;
2808 u64 extent_physical;
2810 struct btrfs_device *extent_dev;
2811 struct scrub_parity *sparity;
2814 int extent_mirror_num;
2817 nsectors = map->stripe_len / root->sectorsize;
2818 bitmap_len = scrub_calc_parity_bitmap_len(nsectors);
2819 sparity = kzalloc(sizeof(struct scrub_parity) + 2 * bitmap_len,
2822 spin_lock(&sctx->stat_lock);
2823 sctx->stat.malloc_errors++;
2824 spin_unlock(&sctx->stat_lock);
2828 sparity->stripe_len = map->stripe_len;
2829 sparity->nsectors = nsectors;
2830 sparity->sctx = sctx;
2831 sparity->scrub_dev = sdev;
2832 sparity->logic_start = logic_start;
2833 sparity->logic_end = logic_end;
2834 atomic_set(&sparity->ref_count, 1);
2835 INIT_LIST_HEAD(&sparity->spages);
2836 sparity->dbitmap = sparity->bitmap;
2837 sparity->ebitmap = (void *)sparity->bitmap + bitmap_len;
2840 while (logic_start < logic_end) {
2841 if (btrfs_fs_incompat(fs_info, SKINNY_METADATA))
2842 key.type = BTRFS_METADATA_ITEM_KEY;
2844 key.type = BTRFS_EXTENT_ITEM_KEY;
2845 key.objectid = logic_start;
2846 key.offset = (u64)-1;
2848 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
2853 ret = btrfs_previous_extent_item(root, path, 0);
2857 btrfs_release_path(path);
2858 ret = btrfs_search_slot(NULL, root, &key,
2870 slot = path->slots[0];
2871 if (slot >= btrfs_header_nritems(l)) {
2872 ret = btrfs_next_leaf(root, path);
2881 btrfs_item_key_to_cpu(l, &key, slot);
2883 if (key.type == BTRFS_METADATA_ITEM_KEY)
2884 bytes = root->nodesize;
2888 if (key.objectid + bytes <= logic_start)
2891 if (key.type != BTRFS_EXTENT_ITEM_KEY &&
2892 key.type != BTRFS_METADATA_ITEM_KEY)
2895 if (key.objectid > logic_end) {
2900 while (key.objectid >= logic_start + map->stripe_len)
2901 logic_start += map->stripe_len;
2903 extent = btrfs_item_ptr(l, slot,
2904 struct btrfs_extent_item);
2905 flags = btrfs_extent_flags(l, extent);
2906 generation = btrfs_extent_generation(l, extent);
2908 if (key.objectid < logic_start &&
2909 (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) {
2911 "scrub: tree block %llu spanning stripes, ignored. logical=%llu",
2912 key.objectid, logic_start);
2916 extent_logical = key.objectid;
2919 if (extent_logical < logic_start) {
2920 extent_len -= logic_start - extent_logical;
2921 extent_logical = logic_start;
2924 if (extent_logical + extent_len >
2925 logic_start + map->stripe_len)
2926 extent_len = logic_start + map->stripe_len -
2929 scrub_parity_mark_sectors_data(sparity, extent_logical,
2932 scrub_remap_extent(fs_info, extent_logical,
2933 extent_len, &extent_physical,
2935 &extent_mirror_num);
2937 ret = btrfs_lookup_csums_range(csum_root,
2939 extent_logical + extent_len - 1,
2940 &sctx->csum_list, 1);
2944 ret = scrub_extent_for_parity(sparity, extent_logical,
2953 scrub_free_csums(sctx);
2954 if (extent_logical + extent_len <
2955 key.objectid + bytes) {
2956 logic_start += map->stripe_len;
2958 if (logic_start >= logic_end) {
2963 if (logic_start < key.objectid + bytes) {
2972 btrfs_release_path(path);
2977 logic_start += map->stripe_len;
2981 scrub_parity_mark_sectors_error(sparity, logic_start,
2982 logic_end - logic_start + 1);
2983 scrub_parity_put(sparity);
2985 mutex_lock(&sctx->wr_ctx.wr_lock);
2986 scrub_wr_submit(sctx);
2987 mutex_unlock(&sctx->wr_ctx.wr_lock);
2989 btrfs_release_path(path);
2990 return ret < 0 ? ret : 0;
2993 static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
2994 struct map_lookup *map,
2995 struct btrfs_device *scrub_dev,
2996 int num, u64 base, u64 length,
2999 struct btrfs_path *path, *ppath;
3000 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
3001 struct btrfs_root *root = fs_info->extent_root;
3002 struct btrfs_root *csum_root = fs_info->csum_root;
3003 struct btrfs_extent_item *extent;
3004 struct blk_plug plug;
3009 struct extent_buffer *l;
3010 struct btrfs_key key;
3017 struct reada_control *reada1;
3018 struct reada_control *reada2;
3019 struct btrfs_key key_start;
3020 struct btrfs_key key_end;
3021 u64 increment = map->stripe_len;
3024 u64 extent_physical;
3028 struct btrfs_device *extent_dev;
3029 int extent_mirror_num;
3033 physical = map->stripes[num].physical;
3035 do_div(nstripes, map->stripe_len);
3036 if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
3037 offset = map->stripe_len * num;
3038 increment = map->stripe_len * map->num_stripes;
3040 } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
3041 int factor = map->num_stripes / map->sub_stripes;
3042 offset = map->stripe_len * (num / map->sub_stripes);
3043 increment = map->stripe_len * factor;
3044 mirror_num = num % map->sub_stripes + 1;
3045 } else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
3046 increment = map->stripe_len;
3047 mirror_num = num % map->num_stripes + 1;
3048 } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
3049 increment = map->stripe_len;
3050 mirror_num = num % map->num_stripes + 1;
3051 } else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
3052 BTRFS_BLOCK_GROUP_RAID6)) {
3053 get_raid56_logic_offset(physical, num, map, &offset, NULL);
3054 increment = map->stripe_len * nr_data_stripes(map);
3057 increment = map->stripe_len;
3061 path = btrfs_alloc_path();
3065 ppath = btrfs_alloc_path();
3067 btrfs_free_path(ppath);
3072 * work on commit root. The related disk blocks are static as
3073 * long as COW is applied. This means, it is save to rewrite
3074 * them to repair disk errors without any race conditions
3076 path->search_commit_root = 1;
3077 path->skip_locking = 1;
3080 * trigger the readahead for extent tree csum tree and wait for
3081 * completion. During readahead, the scrub is officially paused
3082 * to not hold off transaction commits
3084 logical = base + offset;
3085 physical_end = physical + nstripes * map->stripe_len;
3086 if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
3087 BTRFS_BLOCK_GROUP_RAID6)) {
3088 get_raid56_logic_offset(physical_end, num,
3089 map, &logic_end, NULL);
3092 logic_end = logical + increment * nstripes;
3094 wait_event(sctx->list_wait,
3095 atomic_read(&sctx->bios_in_flight) == 0);
3096 scrub_blocked_if_needed(fs_info);
3098 /* FIXME it might be better to start readahead at commit root */
3099 key_start.objectid = logical;
3100 key_start.type = BTRFS_EXTENT_ITEM_KEY;
3101 key_start.offset = (u64)0;
3102 key_end.objectid = logic_end;
3103 key_end.type = BTRFS_METADATA_ITEM_KEY;
3104 key_end.offset = (u64)-1;
3105 reada1 = btrfs_reada_add(root, &key_start, &key_end);
3107 key_start.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
3108 key_start.type = BTRFS_EXTENT_CSUM_KEY;
3109 key_start.offset = logical;
3110 key_end.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
3111 key_end.type = BTRFS_EXTENT_CSUM_KEY;
3112 key_end.offset = logic_end;
3113 reada2 = btrfs_reada_add(csum_root, &key_start, &key_end);
3115 if (!IS_ERR(reada1))
3116 btrfs_reada_wait(reada1);
3117 if (!IS_ERR(reada2))
3118 btrfs_reada_wait(reada2);
3122 * collect all data csums for the stripe to avoid seeking during
3123 * the scrub. This might currently (crc32) end up to be about 1MB
3125 blk_start_plug(&plug);
3128 * now find all extents for each stripe and scrub them
3131 while (physical < physical_end) {
3132 /* for raid56, we skip parity stripe */
3133 if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
3134 BTRFS_BLOCK_GROUP_RAID6)) {
3135 ret = get_raid56_logic_offset(physical, num,
3136 map, &logical, &stripe_logical);
3139 stripe_logical += base;
3140 stripe_end = stripe_logical + increment - 1;
3141 ret = scrub_raid56_parity(sctx, map, scrub_dev,
3142 ppath, stripe_logical,
3152 if (atomic_read(&fs_info->scrub_cancel_req) ||
3153 atomic_read(&sctx->cancel_req)) {
3158 * check to see if we have to pause
3160 if (atomic_read(&fs_info->scrub_pause_req)) {
3161 /* push queued extents */
3162 atomic_set(&sctx->wr_ctx.flush_all_writes, 1);
3164 mutex_lock(&sctx->wr_ctx.wr_lock);
3165 scrub_wr_submit(sctx);
3166 mutex_unlock(&sctx->wr_ctx.wr_lock);
3167 wait_event(sctx->list_wait,
3168 atomic_read(&sctx->bios_in_flight) == 0);
3169 atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
3170 scrub_blocked_if_needed(fs_info);
3173 if (btrfs_fs_incompat(fs_info, SKINNY_METADATA))
3174 key.type = BTRFS_METADATA_ITEM_KEY;
3176 key.type = BTRFS_EXTENT_ITEM_KEY;
3177 key.objectid = logical;
3178 key.offset = (u64)-1;
3180 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3185 ret = btrfs_previous_extent_item(root, path, 0);
3189 /* there's no smaller item, so stick with the
3191 btrfs_release_path(path);
3192 ret = btrfs_search_slot(NULL, root, &key,
3204 slot = path->slots[0];
3205 if (slot >= btrfs_header_nritems(l)) {
3206 ret = btrfs_next_leaf(root, path);
3215 btrfs_item_key_to_cpu(l, &key, slot);
3217 if (key.type == BTRFS_METADATA_ITEM_KEY)
3218 bytes = root->nodesize;
3222 if (key.objectid + bytes <= logical)
3225 if (key.type != BTRFS_EXTENT_ITEM_KEY &&
3226 key.type != BTRFS_METADATA_ITEM_KEY)
3229 if (key.objectid >= logical + map->stripe_len) {
3230 /* out of this device extent */
3231 if (key.objectid >= logic_end)
3236 extent = btrfs_item_ptr(l, slot,
3237 struct btrfs_extent_item);
3238 flags = btrfs_extent_flags(l, extent);
3239 generation = btrfs_extent_generation(l, extent);
3241 if (key.objectid < logical &&
3242 (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK)) {
3244 "scrub: tree block %llu spanning "
3245 "stripes, ignored. logical=%llu",
3246 key.objectid, logical);
3251 extent_logical = key.objectid;
3255 * trim extent to this stripe
3257 if (extent_logical < logical) {
3258 extent_len -= logical - extent_logical;
3259 extent_logical = logical;
3261 if (extent_logical + extent_len >
3262 logical + map->stripe_len) {
3263 extent_len = logical + map->stripe_len -
3267 extent_physical = extent_logical - logical + physical;
3268 extent_dev = scrub_dev;
3269 extent_mirror_num = mirror_num;
3271 scrub_remap_extent(fs_info, extent_logical,
3272 extent_len, &extent_physical,
3274 &extent_mirror_num);
3276 ret = btrfs_lookup_csums_range(csum_root, logical,
3277 logical + map->stripe_len - 1,
3278 &sctx->csum_list, 1);
3282 ret = scrub_extent(sctx, extent_logical, extent_len,
3283 extent_physical, extent_dev, flags,
3284 generation, extent_mirror_num,
3285 extent_logical - logical + physical);
3289 scrub_free_csums(sctx);
3290 if (extent_logical + extent_len <
3291 key.objectid + bytes) {
3292 if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
3293 BTRFS_BLOCK_GROUP_RAID6)) {
3295 * loop until we find next data stripe
3296 * or we have finished all stripes.
3299 physical += map->stripe_len;
3300 ret = get_raid56_logic_offset(physical,
3305 if (ret && physical < physical_end) {
3306 stripe_logical += base;
3307 stripe_end = stripe_logical +
3309 ret = scrub_raid56_parity(sctx,
3310 map, scrub_dev, ppath,
3318 physical += map->stripe_len;
3319 logical += increment;
3321 if (logical < key.objectid + bytes) {
3326 if (physical >= physical_end) {
3334 btrfs_release_path(path);
3336 logical += increment;
3337 physical += map->stripe_len;
3338 spin_lock(&sctx->stat_lock);
3340 sctx->stat.last_physical = map->stripes[num].physical +
3343 sctx->stat.last_physical = physical;
3344 spin_unlock(&sctx->stat_lock);
3349 /* push queued extents */
3351 mutex_lock(&sctx->wr_ctx.wr_lock);
3352 scrub_wr_submit(sctx);
3353 mutex_unlock(&sctx->wr_ctx.wr_lock);
3355 blk_finish_plug(&plug);
3356 btrfs_free_path(path);
3357 btrfs_free_path(ppath);
3358 return ret < 0 ? ret : 0;
3361 static noinline_for_stack int scrub_chunk(struct scrub_ctx *sctx,
3362 struct btrfs_device *scrub_dev,
3363 u64 chunk_tree, u64 chunk_objectid,
3364 u64 chunk_offset, u64 length,
3365 u64 dev_offset, int is_dev_replace)
3367 struct btrfs_mapping_tree *map_tree =
3368 &sctx->dev_root->fs_info->mapping_tree;
3369 struct map_lookup *map;
3370 struct extent_map *em;
3374 read_lock(&map_tree->map_tree.lock);
3375 em = lookup_extent_mapping(&map_tree->map_tree, chunk_offset, 1);
3376 read_unlock(&map_tree->map_tree.lock);
3381 map = (struct map_lookup *)em->bdev;
3382 if (em->start != chunk_offset)
3385 if (em->len < length)
3388 for (i = 0; i < map->num_stripes; ++i) {
3389 if (map->stripes[i].dev->bdev == scrub_dev->bdev &&
3390 map->stripes[i].physical == dev_offset) {
3391 ret = scrub_stripe(sctx, map, scrub_dev, i,
3392 chunk_offset, length,
3399 free_extent_map(em);
3404 static noinline_for_stack
3405 int scrub_enumerate_chunks(struct scrub_ctx *sctx,
3406 struct btrfs_device *scrub_dev, u64 start, u64 end,
3409 struct btrfs_dev_extent *dev_extent = NULL;
3410 struct btrfs_path *path;
3411 struct btrfs_root *root = sctx->dev_root;
3412 struct btrfs_fs_info *fs_info = root->fs_info;
3419 struct extent_buffer *l;
3420 struct btrfs_key key;
3421 struct btrfs_key found_key;
3422 struct btrfs_block_group_cache *cache;
3423 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
3425 path = btrfs_alloc_path();
3430 path->search_commit_root = 1;
3431 path->skip_locking = 1;
3433 key.objectid = scrub_dev->devid;
3435 key.type = BTRFS_DEV_EXTENT_KEY;
3438 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
3442 if (path->slots[0] >=
3443 btrfs_header_nritems(path->nodes[0])) {
3444 ret = btrfs_next_leaf(root, path);
3451 slot = path->slots[0];
3453 btrfs_item_key_to_cpu(l, &found_key, slot);
3455 if (found_key.objectid != scrub_dev->devid)
3458 if (found_key.type != BTRFS_DEV_EXTENT_KEY)
3461 if (found_key.offset >= end)
3464 if (found_key.offset < key.offset)
3467 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
3468 length = btrfs_dev_extent_length(l, dev_extent);
3470 if (found_key.offset + length <= start)
3473 chunk_tree = btrfs_dev_extent_chunk_tree(l, dev_extent);
3474 chunk_objectid = btrfs_dev_extent_chunk_objectid(l, dev_extent);
3475 chunk_offset = btrfs_dev_extent_chunk_offset(l, dev_extent);
3478 * get a reference on the corresponding block group to prevent
3479 * the chunk from going away while we scrub it
3481 cache = btrfs_lookup_block_group(fs_info, chunk_offset);
3483 /* some chunks are removed but not committed to disk yet,
3484 * continue scrubbing */
3488 dev_replace->cursor_right = found_key.offset + length;
3489 dev_replace->cursor_left = found_key.offset;
3490 dev_replace->item_needs_writeback = 1;
3491 ret = scrub_chunk(sctx, scrub_dev, chunk_tree, chunk_objectid,
3492 chunk_offset, length, found_key.offset,
3496 * flush, submit all pending read and write bios, afterwards
3498 * Note that in the dev replace case, a read request causes
3499 * write requests that are submitted in the read completion
3500 * worker. Therefore in the current situation, it is required
3501 * that all write requests are flushed, so that all read and
3502 * write requests are really completed when bios_in_flight
3505 atomic_set(&sctx->wr_ctx.flush_all_writes, 1);
3507 mutex_lock(&sctx->wr_ctx.wr_lock);
3508 scrub_wr_submit(sctx);
3509 mutex_unlock(&sctx->wr_ctx.wr_lock);
3511 wait_event(sctx->list_wait,
3512 atomic_read(&sctx->bios_in_flight) == 0);
3513 atomic_inc(&fs_info->scrubs_paused);
3514 wake_up(&fs_info->scrub_pause_wait);
3517 * must be called before we decrease @scrub_paused.
3518 * make sure we don't block transaction commit while
3519 * we are waiting pending workers finished.
3521 wait_event(sctx->list_wait,
3522 atomic_read(&sctx->workers_pending) == 0);
3523 atomic_set(&sctx->wr_ctx.flush_all_writes, 0);
3525 mutex_lock(&fs_info->scrub_lock);
3526 __scrub_blocked_if_needed(fs_info);
3527 atomic_dec(&fs_info->scrubs_paused);
3528 mutex_unlock(&fs_info->scrub_lock);
3529 wake_up(&fs_info->scrub_pause_wait);
3531 btrfs_put_block_group(cache);
3534 if (is_dev_replace &&
3535 atomic64_read(&dev_replace->num_write_errors) > 0) {
3539 if (sctx->stat.malloc_errors > 0) {
3544 dev_replace->cursor_left = dev_replace->cursor_right;
3545 dev_replace->item_needs_writeback = 1;
3547 key.offset = found_key.offset + length;
3548 btrfs_release_path(path);
3551 btrfs_free_path(path);
3554 * ret can still be 1 from search_slot or next_leaf,
3555 * that's not an error
3557 return ret < 0 ? ret : 0;
3560 static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx,
3561 struct btrfs_device *scrub_dev)
3567 struct btrfs_root *root = sctx->dev_root;
3569 if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state))
3572 /* Seed devices of a new filesystem has their own generation. */
3573 if (scrub_dev->fs_devices != root->fs_info->fs_devices)
3574 gen = scrub_dev->generation;
3576 gen = root->fs_info->last_trans_committed;
3578 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
3579 bytenr = btrfs_sb_offset(i);
3580 if (bytenr + BTRFS_SUPER_INFO_SIZE >
3581 scrub_dev->commit_total_bytes)
3584 ret = scrub_pages(sctx, bytenr, BTRFS_SUPER_INFO_SIZE, bytenr,
3585 scrub_dev, BTRFS_EXTENT_FLAG_SUPER, gen, i,
3590 wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
3596 * get a reference count on fs_info->scrub_workers. start worker if necessary
3598 static noinline_for_stack int scrub_workers_get(struct btrfs_fs_info *fs_info,
3602 int flags = WQ_FREEZABLE | WQ_UNBOUND;
3603 int max_active = fs_info->thread_pool_size;
3605 if (fs_info->scrub_workers_refcnt == 0) {
3607 fs_info->scrub_workers =
3608 btrfs_alloc_workqueue("btrfs-scrub", flags,
3611 fs_info->scrub_workers =
3612 btrfs_alloc_workqueue("btrfs-scrub", flags,
3614 if (!fs_info->scrub_workers) {
3618 fs_info->scrub_wr_completion_workers =
3619 btrfs_alloc_workqueue("btrfs-scrubwrc", flags,
3621 if (!fs_info->scrub_wr_completion_workers) {
3625 fs_info->scrub_nocow_workers =
3626 btrfs_alloc_workqueue("btrfs-scrubnc", flags, 1, 0);
3627 if (!fs_info->scrub_nocow_workers) {
3632 ++fs_info->scrub_workers_refcnt;
3637 static noinline_for_stack void scrub_workers_put(struct btrfs_fs_info *fs_info)
3639 if (--fs_info->scrub_workers_refcnt == 0) {
3640 btrfs_destroy_workqueue(fs_info->scrub_workers);
3641 btrfs_destroy_workqueue(fs_info->scrub_wr_completion_workers);
3642 btrfs_destroy_workqueue(fs_info->scrub_nocow_workers);
3644 WARN_ON(fs_info->scrub_workers_refcnt < 0);
3647 int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
3648 u64 end, struct btrfs_scrub_progress *progress,
3649 int readonly, int is_dev_replace)
3651 struct scrub_ctx *sctx;
3653 struct btrfs_device *dev;
3654 struct rcu_string *name;
3656 if (btrfs_fs_closing(fs_info))
3659 if (fs_info->chunk_root->nodesize > BTRFS_STRIPE_LEN) {
3661 * in this case scrub is unable to calculate the checksum
3662 * the way scrub is implemented. Do not handle this
3663 * situation at all because it won't ever happen.
3666 "scrub: size assumption nodesize <= BTRFS_STRIPE_LEN (%d <= %d) fails",
3667 fs_info->chunk_root->nodesize, BTRFS_STRIPE_LEN);
3671 if (fs_info->chunk_root->sectorsize != PAGE_SIZE) {
3672 /* not supported for data w/o checksums */
3674 "scrub: size assumption sectorsize != PAGE_SIZE "
3675 "(%d != %lu) fails",
3676 fs_info->chunk_root->sectorsize, PAGE_SIZE);
3680 if (fs_info->chunk_root->nodesize >
3681 PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK ||
3682 fs_info->chunk_root->sectorsize >
3683 PAGE_SIZE * SCRUB_MAX_PAGES_PER_BLOCK) {
3685 * would exhaust the array bounds of pagev member in
3686 * struct scrub_block
3688 btrfs_err(fs_info, "scrub: size assumption nodesize and sectorsize "
3689 "<= SCRUB_MAX_PAGES_PER_BLOCK (%d <= %d && %d <= %d) fails",
3690 fs_info->chunk_root->nodesize,
3691 SCRUB_MAX_PAGES_PER_BLOCK,
3692 fs_info->chunk_root->sectorsize,
3693 SCRUB_MAX_PAGES_PER_BLOCK);
3698 mutex_lock(&fs_info->fs_devices->device_list_mutex);
3699 dev = btrfs_find_device(fs_info, devid, NULL, NULL);
3700 if (!dev || (dev->missing && !is_dev_replace)) {
3701 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3705 if (!is_dev_replace && !readonly && !dev->writeable) {
3706 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3708 name = rcu_dereference(dev->name);
3709 btrfs_err(fs_info, "scrub: device %s is not writable",
3715 mutex_lock(&fs_info->scrub_lock);
3716 if (!dev->in_fs_metadata || dev->is_tgtdev_for_dev_replace) {
3717 mutex_unlock(&fs_info->scrub_lock);
3718 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3722 btrfs_dev_replace_lock(&fs_info->dev_replace);
3723 if (dev->scrub_device ||
3725 btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) {
3726 btrfs_dev_replace_unlock(&fs_info->dev_replace);
3727 mutex_unlock(&fs_info->scrub_lock);
3728 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3729 return -EINPROGRESS;
3731 btrfs_dev_replace_unlock(&fs_info->dev_replace);
3733 ret = scrub_workers_get(fs_info, is_dev_replace);
3735 mutex_unlock(&fs_info->scrub_lock);
3736 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3740 sctx = scrub_setup_ctx(dev, is_dev_replace);
3742 mutex_unlock(&fs_info->scrub_lock);
3743 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3744 scrub_workers_put(fs_info);
3745 return PTR_ERR(sctx);
3747 sctx->readonly = readonly;
3748 dev->scrub_device = sctx;
3749 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3752 * checking @scrub_pause_req here, we can avoid
3753 * race between committing transaction and scrubbing.
3755 __scrub_blocked_if_needed(fs_info);
3756 atomic_inc(&fs_info->scrubs_running);
3757 mutex_unlock(&fs_info->scrub_lock);
3759 if (!is_dev_replace) {
3761 * by holding device list mutex, we can
3762 * kick off writing super in log tree sync.
3764 mutex_lock(&fs_info->fs_devices->device_list_mutex);
3765 ret = scrub_supers(sctx, dev);
3766 mutex_unlock(&fs_info->fs_devices->device_list_mutex);
3770 ret = scrub_enumerate_chunks(sctx, dev, start, end,
3773 wait_event(sctx->list_wait, atomic_read(&sctx->bios_in_flight) == 0);
3774 atomic_dec(&fs_info->scrubs_running);
3775 wake_up(&fs_info->scrub_pause_wait);
3777 wait_event(sctx->list_wait, atomic_read(&sctx->workers_pending) == 0);
3780 memcpy(progress, &sctx->stat, sizeof(*progress));
3782 mutex_lock(&fs_info->scrub_lock);
3783 dev->scrub_device = NULL;
3784 scrub_workers_put(fs_info);
3785 mutex_unlock(&fs_info->scrub_lock);
3787 scrub_free_ctx(sctx);
3792 void btrfs_scrub_pause(struct btrfs_root *root)
3794 struct btrfs_fs_info *fs_info = root->fs_info;
3796 mutex_lock(&fs_info->scrub_lock);
3797 atomic_inc(&fs_info->scrub_pause_req);
3798 while (atomic_read(&fs_info->scrubs_paused) !=
3799 atomic_read(&fs_info->scrubs_running)) {
3800 mutex_unlock(&fs_info->scrub_lock);
3801 wait_event(fs_info->scrub_pause_wait,
3802 atomic_read(&fs_info->scrubs_paused) ==
3803 atomic_read(&fs_info->scrubs_running));
3804 mutex_lock(&fs_info->scrub_lock);
3806 mutex_unlock(&fs_info->scrub_lock);
3809 void btrfs_scrub_continue(struct btrfs_root *root)
3811 struct btrfs_fs_info *fs_info = root->fs_info;
3813 atomic_dec(&fs_info->scrub_pause_req);
3814 wake_up(&fs_info->scrub_pause_wait);
3817 int btrfs_scrub_cancel(struct btrfs_fs_info *fs_info)
3819 mutex_lock(&fs_info->scrub_lock);
3820 if (!atomic_read(&fs_info->scrubs_running)) {
3821 mutex_unlock(&fs_info->scrub_lock);
3825 atomic_inc(&fs_info->scrub_cancel_req);
3826 while (atomic_read(&fs_info->scrubs_running)) {
3827 mutex_unlock(&fs_info->scrub_lock);
3828 wait_event(fs_info->scrub_pause_wait,
3829 atomic_read(&fs_info->scrubs_running) == 0);
3830 mutex_lock(&fs_info->scrub_lock);
3832 atomic_dec(&fs_info->scrub_cancel_req);
3833 mutex_unlock(&fs_info->scrub_lock);
3838 int btrfs_scrub_cancel_dev(struct btrfs_fs_info *fs_info,
3839 struct btrfs_device *dev)
3841 struct scrub_ctx *sctx;
3843 mutex_lock(&fs_info->scrub_lock);
3844 sctx = dev->scrub_device;
3846 mutex_unlock(&fs_info->scrub_lock);
3849 atomic_inc(&sctx->cancel_req);
3850 while (dev->scrub_device) {
3851 mutex_unlock(&fs_info->scrub_lock);
3852 wait_event(fs_info->scrub_pause_wait,
3853 dev->scrub_device == NULL);
3854 mutex_lock(&fs_info->scrub_lock);
3856 mutex_unlock(&fs_info->scrub_lock);
3861 int btrfs_scrub_progress(struct btrfs_root *root, u64 devid,
3862 struct btrfs_scrub_progress *progress)
3864 struct btrfs_device *dev;
3865 struct scrub_ctx *sctx = NULL;
3867 mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
3868 dev = btrfs_find_device(root->fs_info, devid, NULL, NULL);
3870 sctx = dev->scrub_device;
3872 memcpy(progress, &sctx->stat, sizeof(*progress));
3873 mutex_unlock(&root->fs_info->fs_devices->device_list_mutex);
3875 return dev ? (sctx ? 0 : -ENOTCONN) : -ENODEV;
3878 static void scrub_remap_extent(struct btrfs_fs_info *fs_info,
3879 u64 extent_logical, u64 extent_len,
3880 u64 *extent_physical,
3881 struct btrfs_device **extent_dev,
3882 int *extent_mirror_num)
3885 struct btrfs_bio *bbio = NULL;
3888 mapped_length = extent_len;
3889 ret = btrfs_map_block(fs_info, READ, extent_logical,
3890 &mapped_length, &bbio, 0);
3891 if (ret || !bbio || mapped_length < extent_len ||
3892 !bbio->stripes[0].dev->bdev) {
3897 *extent_physical = bbio->stripes[0].physical;
3898 *extent_mirror_num = bbio->mirror_num;
3899 *extent_dev = bbio->stripes[0].dev;
3903 static int scrub_setup_wr_ctx(struct scrub_ctx *sctx,
3904 struct scrub_wr_ctx *wr_ctx,
3905 struct btrfs_fs_info *fs_info,
3906 struct btrfs_device *dev,
3909 WARN_ON(wr_ctx->wr_curr_bio != NULL);
3911 mutex_init(&wr_ctx->wr_lock);
3912 wr_ctx->wr_curr_bio = NULL;
3913 if (!is_dev_replace)
3916 WARN_ON(!dev->bdev);
3917 wr_ctx->pages_per_wr_bio = min_t(int, SCRUB_PAGES_PER_WR_BIO,
3918 bio_get_nr_vecs(dev->bdev));
3919 wr_ctx->tgtdev = dev;
3920 atomic_set(&wr_ctx->flush_all_writes, 0);
3924 static void scrub_free_wr_ctx(struct scrub_wr_ctx *wr_ctx)
3926 mutex_lock(&wr_ctx->wr_lock);
3927 kfree(wr_ctx->wr_curr_bio);
3928 wr_ctx->wr_curr_bio = NULL;
3929 mutex_unlock(&wr_ctx->wr_lock);
3932 static int copy_nocow_pages(struct scrub_ctx *sctx, u64 logical, u64 len,
3933 int mirror_num, u64 physical_for_dev_replace)
3935 struct scrub_copy_nocow_ctx *nocow_ctx;
3936 struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
3938 nocow_ctx = kzalloc(sizeof(*nocow_ctx), GFP_NOFS);
3940 spin_lock(&sctx->stat_lock);
3941 sctx->stat.malloc_errors++;
3942 spin_unlock(&sctx->stat_lock);
3946 scrub_pending_trans_workers_inc(sctx);
3948 nocow_ctx->sctx = sctx;
3949 nocow_ctx->logical = logical;
3950 nocow_ctx->len = len;
3951 nocow_ctx->mirror_num = mirror_num;
3952 nocow_ctx->physical_for_dev_replace = physical_for_dev_replace;
3953 btrfs_init_work(&nocow_ctx->work, btrfs_scrubnc_helper,
3954 copy_nocow_pages_worker, NULL, NULL);
3955 INIT_LIST_HEAD(&nocow_ctx->inodes);
3956 btrfs_queue_work(fs_info->scrub_nocow_workers,
3962 static int record_inode_for_nocow(u64 inum, u64 offset, u64 root, void *ctx)
3964 struct scrub_copy_nocow_ctx *nocow_ctx = ctx;
3965 struct scrub_nocow_inode *nocow_inode;
3967 nocow_inode = kzalloc(sizeof(*nocow_inode), GFP_NOFS);
3970 nocow_inode->inum = inum;
3971 nocow_inode->offset = offset;
3972 nocow_inode->root = root;
3973 list_add_tail(&nocow_inode->list, &nocow_ctx->inodes);
3977 #define COPY_COMPLETE 1
3979 static void copy_nocow_pages_worker(struct btrfs_work *work)
3981 struct scrub_copy_nocow_ctx *nocow_ctx =
3982 container_of(work, struct scrub_copy_nocow_ctx, work);
3983 struct scrub_ctx *sctx = nocow_ctx->sctx;
3984 u64 logical = nocow_ctx->logical;
3985 u64 len = nocow_ctx->len;
3986 int mirror_num = nocow_ctx->mirror_num;
3987 u64 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace;
3989 struct btrfs_trans_handle *trans = NULL;
3990 struct btrfs_fs_info *fs_info;
3991 struct btrfs_path *path;
3992 struct btrfs_root *root;
3993 int not_written = 0;
3995 fs_info = sctx->dev_root->fs_info;
3996 root = fs_info->extent_root;
3998 path = btrfs_alloc_path();
4000 spin_lock(&sctx->stat_lock);
4001 sctx->stat.malloc_errors++;
4002 spin_unlock(&sctx->stat_lock);
4007 trans = btrfs_join_transaction(root);
4008 if (IS_ERR(trans)) {
4013 ret = iterate_inodes_from_logical(logical, fs_info, path,
4014 record_inode_for_nocow, nocow_ctx);
4015 if (ret != 0 && ret != -ENOENT) {
4016 btrfs_warn(fs_info, "iterate_inodes_from_logical() failed: log %llu, "
4017 "phys %llu, len %llu, mir %u, ret %d",
4018 logical, physical_for_dev_replace, len, mirror_num,
4024 btrfs_end_transaction(trans, root);
4026 while (!list_empty(&nocow_ctx->inodes)) {
4027 struct scrub_nocow_inode *entry;
4028 entry = list_first_entry(&nocow_ctx->inodes,
4029 struct scrub_nocow_inode,
4031 list_del_init(&entry->list);
4032 ret = copy_nocow_pages_for_inode(entry->inum, entry->offset,
4033 entry->root, nocow_ctx);
4035 if (ret == COPY_COMPLETE) {
4043 while (!list_empty(&nocow_ctx->inodes)) {
4044 struct scrub_nocow_inode *entry;
4045 entry = list_first_entry(&nocow_ctx->inodes,
4046 struct scrub_nocow_inode,
4048 list_del_init(&entry->list);
4051 if (trans && !IS_ERR(trans))
4052 btrfs_end_transaction(trans, root);
4054 btrfs_dev_replace_stats_inc(&fs_info->dev_replace.
4055 num_uncorrectable_read_errors);
4057 btrfs_free_path(path);
4060 scrub_pending_trans_workers_dec(sctx);
4063 static int check_extent_to_block(struct inode *inode, u64 start, u64 len,
4066 struct extent_state *cached_state = NULL;
4067 struct btrfs_ordered_extent *ordered;
4068 struct extent_io_tree *io_tree;
4069 struct extent_map *em;
4070 u64 lockstart = start, lockend = start + len - 1;
4073 io_tree = &BTRFS_I(inode)->io_tree;
4075 lock_extent_bits(io_tree, lockstart, lockend, 0, &cached_state);
4076 ordered = btrfs_lookup_ordered_range(inode, lockstart, len);
4078 btrfs_put_ordered_extent(ordered);
4083 em = btrfs_get_extent(inode, NULL, 0, start, len, 0);
4090 * This extent does not actually cover the logical extent anymore,
4091 * move on to the next inode.
4093 if (em->block_start > logical ||
4094 em->block_start + em->block_len < logical + len) {
4095 free_extent_map(em);
4099 free_extent_map(em);
4102 unlock_extent_cached(io_tree, lockstart, lockend, &cached_state,
4107 static int copy_nocow_pages_for_inode(u64 inum, u64 offset, u64 root,
4108 struct scrub_copy_nocow_ctx *nocow_ctx)
4110 struct btrfs_fs_info *fs_info = nocow_ctx->sctx->dev_root->fs_info;
4111 struct btrfs_key key;
4112 struct inode *inode;
4114 struct btrfs_root *local_root;
4115 struct extent_io_tree *io_tree;
4116 u64 physical_for_dev_replace;
4117 u64 nocow_ctx_logical;
4118 u64 len = nocow_ctx->len;
4119 unsigned long index;
4124 key.objectid = root;
4125 key.type = BTRFS_ROOT_ITEM_KEY;
4126 key.offset = (u64)-1;
4128 srcu_index = srcu_read_lock(&fs_info->subvol_srcu);
4130 local_root = btrfs_read_fs_root_no_name(fs_info, &key);
4131 if (IS_ERR(local_root)) {
4132 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
4133 return PTR_ERR(local_root);
4136 key.type = BTRFS_INODE_ITEM_KEY;
4137 key.objectid = inum;
4139 inode = btrfs_iget(fs_info->sb, &key, local_root, NULL);
4140 srcu_read_unlock(&fs_info->subvol_srcu, srcu_index);
4142 return PTR_ERR(inode);
4144 /* Avoid truncate/dio/punch hole.. */
4145 mutex_lock(&inode->i_mutex);
4146 inode_dio_wait(inode);
4148 physical_for_dev_replace = nocow_ctx->physical_for_dev_replace;
4149 io_tree = &BTRFS_I(inode)->io_tree;
4150 nocow_ctx_logical = nocow_ctx->logical;
4152 ret = check_extent_to_block(inode, offset, len, nocow_ctx_logical);
4154 ret = ret > 0 ? 0 : ret;
4158 while (len >= PAGE_CACHE_SIZE) {
4159 index = offset >> PAGE_CACHE_SHIFT;
4161 page = find_or_create_page(inode->i_mapping, index, GFP_NOFS);
4163 btrfs_err(fs_info, "find_or_create_page() failed");
4168 if (PageUptodate(page)) {
4169 if (PageDirty(page))
4172 ClearPageError(page);
4173 err = extent_read_full_page(io_tree, page,
4175 nocow_ctx->mirror_num);
4183 * If the page has been remove from the page cache,
4184 * the data on it is meaningless, because it may be
4185 * old one, the new data may be written into the new
4186 * page in the page cache.
4188 if (page->mapping != inode->i_mapping) {
4190 page_cache_release(page);
4193 if (!PageUptodate(page)) {
4199 ret = check_extent_to_block(inode, offset, len,
4202 ret = ret > 0 ? 0 : ret;
4206 err = write_page_nocow(nocow_ctx->sctx,
4207 physical_for_dev_replace, page);
4212 page_cache_release(page);
4217 offset += PAGE_CACHE_SIZE;
4218 physical_for_dev_replace += PAGE_CACHE_SIZE;
4219 nocow_ctx_logical += PAGE_CACHE_SIZE;
4220 len -= PAGE_CACHE_SIZE;
4222 ret = COPY_COMPLETE;
4224 mutex_unlock(&inode->i_mutex);
4229 static int write_page_nocow(struct scrub_ctx *sctx,
4230 u64 physical_for_dev_replace, struct page *page)
4233 struct btrfs_device *dev;
4236 dev = sctx->wr_ctx.tgtdev;
4240 printk_ratelimited(KERN_WARNING
4241 "BTRFS: scrub write_page_nocow(bdev == NULL) is unexpected!\n");
4244 bio = btrfs_io_bio_alloc(GFP_NOFS, 1);
4246 spin_lock(&sctx->stat_lock);
4247 sctx->stat.malloc_errors++;
4248 spin_unlock(&sctx->stat_lock);
4251 bio->bi_iter.bi_size = 0;
4252 bio->bi_iter.bi_sector = physical_for_dev_replace >> 9;
4253 bio->bi_bdev = dev->bdev;
4254 ret = bio_add_page(bio, page, PAGE_CACHE_SIZE, 0);
4255 if (ret != PAGE_CACHE_SIZE) {
4258 btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS);
4262 if (btrfsic_submit_bio_wait(WRITE_SYNC, bio))
4263 goto leave_with_eio;