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Commit 193ea74b authored by Jan Schmidt's avatar Jan Schmidt
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btrfs scrub: bugfix: mirror_num off by one 



Fix the mirror_num determination in scrub_stripe. The rest of the scrub code
did not use mirror_num for anything important and that error went unnoticed.
The nodatasum fixup patch of this set depends on a correct mirror_num.

Signed-off-by: default avatarJan Schmidt <list.btrfs@jan-o-sch.net>
parent 558540c1

fs/btrfs/scrub.c

+6 −6
Original line number Diff line number Diff line
@@ -452,7 +452,7 @@ static void scrub_fixup(struct scrub_bio *sbio, int ix) 
	 * first find a good copy

	 */

	for (i = 0; i < multi->num_stripes; ++i) {

		if (i == sbio->spag[ix].mirror_num)

		if (i + 1 == sbio->spag[ix].mirror_num)

			continue;



		if (scrub_fixup_io(READ, multi->stripes[i].dev->bdev,
@@ -930,21 +930,21 @@ static noinline_for_stack int scrub_stripe(struct scrub_dev *sdev, 
	if (map->type & BTRFS_BLOCK_GROUP_RAID0) {

		offset = map->stripe_len * num;

		increment = map->stripe_len * map->num_stripes;

		mirror_num = 0;

		mirror_num = 1;

	} else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {

		int factor = map->num_stripes / map->sub_stripes;

		offset = map->stripe_len * (num / map->sub_stripes);

		increment = map->stripe_len * factor;

		mirror_num = num % map->sub_stripes;

		mirror_num = num % map->sub_stripes + 1;

	} else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {

		increment = map->stripe_len;

		mirror_num = num % map->num_stripes;

		mirror_num = num % map->num_stripes + 1;

	} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {

		increment = map->stripe_len;

		mirror_num = num % map->num_stripes;

		mirror_num = num % map->num_stripes + 1;

	} else {

		increment = map->stripe_len;

		mirror_num = 0;

		mirror_num = 1;

	}



	path = btrfs_alloc_path();