Btrfs: search parity device wisely (9cd3a7eb) · Commits · 戴 / test

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:

Liu Bo <bo.li.liu@oracle.com> Reviewed-by:

David Sterba <dsterba@suse.com> [ copied changelog as a comment ] Signed-off-by:

David Sterba <dsterba@suse.com>

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);

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