From bab68499428ed934f0493ac74197ed6f36204260 Mon Sep 17 00:00:00 2001 From: Damien Le Moal Date: Wed, 19 May 2021 10:26:16 +0900 Subject: dm zoned: check zone capacity The dm-zoned target cannot support zoned block devices with zones that have a capacity smaller than the zone size (e.g. NVMe zoned namespaces) due to the current chunk zone mapping implementation as it is assumed that zones and chunks have the same size with all blocks usable. If a zoned drive is found to have zones with a capacity different from the zone size, fail the target initialization. Signed-off-by: Damien Le Moal Cc: stable@vger.kernel.org # v5.9+ Signed-off-by: Mike Snitzer --- drivers/md/dm-zoned-metadata.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c index 039d17b28938..ee4626d08557 100644 --- a/drivers/md/dm-zoned-metadata.c +++ b/drivers/md/dm-zoned-metadata.c @@ -1390,6 +1390,13 @@ static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data) return -ENXIO; } + /* + * Devices that have zones with a capacity smaller than the zone size + * (e.g. NVMe zoned namespaces) are not supported. + */ + if (blkz->capacity != blkz->len) + return -ENXIO; + switch (blkz->type) { case BLK_ZONE_TYPE_CONVENTIONAL: set_bit(DMZ_RND, &zone->flags); -- cgit v1.2.3