tree a48199ad035ece17f02a7c81c791f1329eede3e7
parent a3c06a389751192fdcbcdd8bba57bdb856eafe68
author Heinz Mauelshagen <heinzm@redhat.com> 1471441004 +0200
committer Mike Snitzer <snitzer@redhat.com> 1471444959 -0400

dm raid: support raid0 with missing metadata devices

The raid0 MD personality does not start a raid0 array with any of its
data devices missing.

dm-raid was removing data/metadata device pairs unconditionally if it
failed to read a superblock off the respective metadata device of such
pair, resulting in failure to start arrays with the raid0 personality.

Avoid removing any data/metadata device pairs in case of raid0
(e.g. lvm2 segment type 'raid0_meta') thus allowing MD to start the
array.

Also, avoid region size validation for raid0.

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>