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Btrfs: do not merge rbios if their fail stripe index are not identical 

Since fail stripe index in rbio would be used to decide which
algorithm reconstruction would be run, we cannot merge rbios if
their's fail striped indexes are different, otherwise, one of the two
reconstructions would fail.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2017-12-11 14:56:31 -07:00 committed by David Sterba
parent db34be19c4
commit cc54ff626a
1 changed files with 19 additions and 0 deletions
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19
fs/btrfs/raid56.c
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@ -600,6 +600,25 @@ static int rbio_can_merge(struct btrfs_raid_bio *last,
if (last->operation == BTRFS_RBIO_REBUILD_MISSING)
return 0;
if (last->operation == BTRFS_RBIO_READ_REBUILD) {
int fa = last->faila;
int fb = last->failb;
int cur_fa = cur->faila;
int cur_fb = cur->failb;
if (last->faila >= last->failb) {
fa = last->failb;
fb = last->faila;
}
if (cur->faila >= cur->failb) {
cur_fa = cur->failb;
cur_fb = cur->faila;
}
if (fa != cur_fa || fb != cur_fb)
return 0;
}
return 1;
}