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>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index b1c251872800..8abde6b8cedc 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -860,6 +860,9 @@ static int validate_region_size(struct raid_set *rs, unsigned long region_size)
 {
         unsigned long min_region_size = rs->ti->len / (1 << 21);
 
+        if (rs_is_raid0(rs))
+                return 0;
+
         if (!region_size) {
                 /*
                  * Choose a reasonable default.  All figures in sectors.
@@ -929,6 +932,8 @@ static int validate_raid_redundancy(struct raid_set *rs)
                         rebuild_cnt++;
 
         switch (rs->raid_type->level) {
+        case 0:
+                break;
         case 1:
                 if (rebuild_cnt >= rs->md.raid_disks)
                         goto too_many;
@@ -2334,6 +2339,13 @@ static int analyse_superblocks(struct dm_target *ti, struct raid_set *rs)
                 case 0:
                         break;
                 default:
+                        /*
+                         * We have to keep any raid0 data/metadata device pairs or
+                         * the MD raid0 personality will fail to start the array.
+                         */
+                        if (rs_is_raid0(rs))
+                                continue;
+
                         dev = container_of(rdev, struct raid_dev, rdev);
                         if (dev->meta_dev)
                                 dm_put_device(ti, dev->meta_dev);