Commit 9cd3a7eb authored by Liu Bo's avatar Liu Bo Committed by David Sterba
Browse files

Btrfs: search parity device wisely 



After mapping block with BTRFS_MAP_WRITE, parities have been sorted to
the end position, so this search can start from the first parity
stripe.

Signed-off-by: default avatarLiu Bo <bo.li.liu@oracle.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
[ copied changelog as a comment ]
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent ee87cf5e

fs/btrfs/raid56.c

+7 −1
Original line number Diff line number Diff line
@@ -2231,12 +2231,18 @@ raid56_parity_alloc_scrub_rbio(struct btrfs_fs_info *fs_info, struct bio *bio, 
	ASSERT(!bio->bi_iter.bi_size);

	rbio->operation = BTRFS_RBIO_PARITY_SCRUB;



	for (i = 0; i < rbio->real_stripes; i++) {

	/*

	 * After mapping bbio with BTRFS_MAP_WRITE, parities have been sorted

	 * to the end position, so this search can start from the first parity

	 * stripe.

	 */

	for (i = rbio->nr_data; i < rbio->real_stripes; i++) {

		if (bbio->stripes[i].dev == scrub_dev) {

			rbio->scrubp = i;

			break;

		}

	}

	ASSERT(i < rbio->real_stripes);



	/* Now we just support the sectorsize equals to page size */

	ASSERT(fs_info->sectorsize == PAGE_SIZE);