From dc076c838f65723325001c977b39e55fc6ba0fa7 Mon Sep 17 00:00:00 2001
From: Hannes Reinecke <hare@suse.de>
Date: Mon, 11 May 2020 10:24:29 +0200
Subject: [PATCH] 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>
---
 drivers/md/dm-zoned-metadata.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 1290728c197e..939deed1606a 100644
--- 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;
 }