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[1/2] btrfs: Load only necessary csums into list in scrub

Message ID e93ff56830016c5edcbb960584c885b3173090be.1437541968.git.zhaolei@cn.fujitsu.com (mailing list archive)
State Accepted
Headers show

Commit Message

Zhaolei July 22, 2015, 5:14 a.m. UTC 
From: Zhao Lei <zhaolei@cn.fujitsu.com>

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 <zhaolei@cn.fujitsu.com>
---
 fs/btrfs/scrub.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
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Patch

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index 7f56603..d72e8e1 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -3251,9 +3251,11 @@  again:
 						   &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;