btrfs: Load only necessary csums into list in scrub

We need not load csum of whole strip in scrub because strip is trimed before use, it is to say, what we really need to calculate csum is data between [extent_logical, extent_len). This patch changed to use above segment for btrfs_lookup_csums_range() in scrub_stripe() Signed-off-by: Zhao Lei <[email protected]> Signed-off-by: Chris Mason <[email protected]>
josf · Aug 9, 2015 · fe8cf65 · fe8cf65
1 parent a0dd59d
commit fe8cf65
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
@@ -3254,9 +3254,11 @@ static noinline_for_stack int scrub_stripe(struct scrub_ctx *sctx,
 						   &extent_dev,
 						   &extent_mirror_num);
 
-			ret = btrfs_lookup_csums_range(csum_root, logical,
-						logical + map->stripe_len - 1,
-						&sctx->csum_list, 1);
+			ret = btrfs_lookup_csums_range(csum_root,
+						       extent_logical,
+						       extent_logical +
+						       extent_len - 1,
+						       &sctx->csum_list, 1);
 			if (ret)
 				goto out;