[dm-devel] [PATCH] dm zoned: Fix metadata zone size check

[Shin'ichiro Kawasaki]

When dm zoned has multiple devices, metadata is on the cache device, not
in random zones of the zoned devices. Then the number of metadata zones
shall be checked with the number of cache zones, not random zones.

Fixes: 34f5affd04c4 ("dm zoned: separate random and cache zones")
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki at wdc.com>
---
 drivers/md/dm-zoned-metadata.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c
index 130b5a6d9f12..fc1329ca3e70 100644
--- a/drivers/md/dm-zoned-metadata.c
+++ b/drivers/md/dm-zoned-metadata.c
@@ -1078,7 +1078,8 @@ static int dmz_check_sb(struct dmz_metadata *zmd, struct dmz_sb *dsb,
 	nr_meta_zones = (le32_to_cpu(sb->nr_meta_blocks) + zmd->zone_nr_blocks - 1)
 		>> zmd->zone_nr_blocks_shift;
 	if (!nr_meta_zones ||
-	    nr_meta_zones >= zmd->nr_rnd_zones) {
+	    (zmd->nr_devs <= 1 && nr_meta_zones >= zmd->nr_rnd_zones) ||
+	    (zmd->nr_devs > 1 && nr_meta_zones >= zmd->nr_cache_zones)) {
 		dmz_dev_err(dev, "Invalid number of metadata blocks");
 		return -ENXIO;
 	}
-- 
2.25.4