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Btrfs: fix repair code for RAID10 

btrfs_map_block sets mirror_num, so that the repair code knows eventually
which device gave us the read error. For RAID10, mirror_num must be 1 or 2.
Before this fix mirror_num was incorrectly related to our stripe index.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Jan Schmidt 2012-04-27 12:41:45 -04:00 committed by Chris Mason
parent 996d282c7f
commit 3e74317ad7
1 changed files with 2 additions and 1 deletions
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3
fs/btrfs/volumes.c
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@ -3807,10 +3807,11 @@ static int __btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
else if (mirror_num)
stripe_index += mirror_num - 1;
else {
int old_stripe_index = stripe_index;
stripe_index = find_live_mirror(map, stripe_index,
map->sub_stripes, stripe_index +
current->pid % map->sub_stripes);
mirror_num = stripe_index + 1;
mirror_num = stripe_index - old_stripe_index + 1;
}
} else {
/*