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dm zoned: check zone capacity

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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 <damien.lemoal@wdc.com>
Cc: stable@vger.kernel.org # v5.9+
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Damien Le Moal 2021-05-19 10:26:16 +09:00 committed by Mike Snitzer
parent ccde2cbfa3
commit bab6849942
1 changed files with 7 additions and 0 deletions
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7
drivers/md/dm-zoned-metadata.c
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@ -1390,6 +1390,13 @@ static int dmz_init_zone(struct blk_zone *blkz, unsigned int num, void *data)
return -ENXIO; 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) { switch (blkz->type) {
case BLK_ZONE_TYPE_CONVENTIONAL: case BLK_ZONE_TYPE_CONVENTIONAL:
set_bit(DMZ_RND, &zone->flags); set_bit(DMZ_RND, &zone->flags);