[BUG] Scrub is not reporting the correct logical/physical address, it can be verified by the following script:
# mkfs.btrfs -f $dev1 # mount $dev1 $mnt # xfs_io -f -c "pwrite -S 0xaa 0 128k" $mnt/file1 # umount $mnt # xfs_io -f -c "pwrite -S 0xff 13647872 4k" $dev1 # mount $dev1 $mnt # btrfs scrub start -fB $mnt # umount $mnt
Note above 13647872 is the physical address for logical 13631488 + 4K.
Scrub would report the following error:
BTRFS error (device dm-2): unable to fixup (regular) error at logical 13631488 on dev /dev/mapper/test-scratch1 physical 13631488 BTRFS warning (device dm-2): checksum error at logical 13631488 on dev /dev/mapper/test-scratch1, physical 13631488, root 5, inode 257, offset 0, length 4096, links 1 (path: file1)
On the other hand, "btrfs check --check-data-csum" is reporting the correct logical/physical address:
Checking filesystem on /dev/test/scratch1 UUID: db2eb621-b09d-4f24-8199-da17dc7b3201 [5/7] checking csums against data mirror 1 bytenr 13647872 csum 0x13fec125 expected csum 0x656bd64e ERROR: errors found in csum tree
[CAUSE] In the function scrub_stripe_report_errors(), we always use the stripe->logical and its physical address to print the error message, not taking the sector number into consideration at all.
[FIX] Fix the error reporting function by calculating logical/physical with the sector number.
Now the scrub report is correct:
BTRFS error (device dm-2): unable to fixup (regular) error at logical 13647872 on dev /dev/mapper/test-scratch1 physical 13647872 BTRFS warning (device dm-2): checksum error at logical 13647872 on dev /dev/mapper/test-scratch1, physical 13647872, root 5, inode 257, offset 16384, length 4096, links 1 (path: file1)
Fixes: 0096580713ff ("btrfs: scrub: introduce error reporting functionality for scrub_stripe") CC: stable@vger.kernel.org #6.4+ Reviewed-by: Anand Jain anand.jain@oracle.com Reviewed-by: Filipe Manana fdmanana@suse.com Signed-off-by: Qu Wenruo wqu@suse.com --- fs/btrfs/scrub.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-)
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c index fa25004ab04e..72aa74310612 100644 --- a/fs/btrfs/scrub.c +++ b/fs/btrfs/scrub.c @@ -870,7 +870,7 @@ static void scrub_stripe_report_errors(struct scrub_ctx *sctx, DEFAULT_RATELIMIT_BURST); struct btrfs_fs_info *fs_info = sctx->fs_info; struct btrfs_device *dev = NULL; - u64 physical = 0; + u64 stripe_physical = stripe->physical; int nr_data_sectors = 0; int nr_meta_sectors = 0; int nr_nodatacsum_sectors = 0; @@ -903,13 +903,17 @@ static void scrub_stripe_report_errors(struct scrub_ctx *sctx, */ if (ret < 0) goto skip; - physical = bioc->stripes[stripe_index].physical; + stripe_physical = bioc->stripes[stripe_index].physical; dev = bioc->stripes[stripe_index].dev; btrfs_put_bioc(bioc); }
skip: for_each_set_bit(sector_nr, &stripe->extent_sector_bitmap, stripe->nr_sectors) { + const u64 logical = stripe->logical + + (sector_nr << fs_info->sectorsize_bits); + const u64 physical = stripe_physical + + (sector_nr << fs_info->sectorsize_bits); bool repaired = false;
if (stripe->sectors[sector_nr].is_metadata) { @@ -938,12 +942,12 @@ static void scrub_stripe_report_errors(struct scrub_ctx *sctx, if (dev) { btrfs_err_rl_in_rcu(fs_info, "fixed up error at logical %llu on dev %s physical %llu", - stripe->logical, btrfs_dev_name(dev), + logical, btrfs_dev_name(dev), physical); } else { btrfs_err_rl_in_rcu(fs_info, "fixed up error at logical %llu on mirror %u", - stripe->logical, stripe->mirror_num); + logical, stripe->mirror_num); } continue; } @@ -952,26 +956,26 @@ static void scrub_stripe_report_errors(struct scrub_ctx *sctx, if (dev) { btrfs_err_rl_in_rcu(fs_info, "unable to fixup (regular) error at logical %llu on dev %s physical %llu", - stripe->logical, btrfs_dev_name(dev), + logical, btrfs_dev_name(dev), physical); } else { btrfs_err_rl_in_rcu(fs_info, "unable to fixup (regular) error at logical %llu on mirror %u", - stripe->logical, stripe->mirror_num); + logical, stripe->mirror_num); }
if (test_bit(sector_nr, &stripe->io_error_bitmap)) if (__ratelimit(&rs) && dev) scrub_print_common_warning("i/o error", dev, false, - stripe->logical, physical); + logical, physical); if (test_bit(sector_nr, &stripe->csum_error_bitmap)) if (__ratelimit(&rs) && dev) scrub_print_common_warning("checksum error", dev, false, - stripe->logical, physical); + logical, physical); if (test_bit(sector_nr, &stripe->meta_error_bitmap)) if (__ratelimit(&rs) && dev) scrub_print_common_warning("header error", dev, false, - stripe->logical, physical); + logical, physical); }
spin_lock(&sctx->stat_lock);