dm zoned: ignore metadata zone in dmz_alloc_zone()

When looking up zones in dmz_alloc_zone() we need to ignore
metadata zones so as not to accidentally overwrite metadata.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Bob Liu <bob.liu@oracle.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 1290728..939deed 100644 (file)
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -1907,7 +1907,13 @@ again:
                zone = NULL;
                goto again;
        }
+       if (dmz_is_meta(zone)) {
+               struct dmz_dev *dev = dmz_zone_to_dev(zmd, zone);
 
+               dmz_dev_warn(dev, "Zone %u has metadata", zone->id);
+               zone = NULL;
+               goto again;
+       }
        return zone;
 }