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btrfs: Load only necessary csums into list in scrub

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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>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Zhao Lei 2015-07-22 13:14:47 +08:00 • committed by Chris Mason
parent a0dd59de3c
commit fe8cf654b1
1 changed files with 5 additions and 3 deletions
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8
fs/btrfs/scrub.c
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@ -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;