[dm-devel] [PATCH] dm zoned: check zone capacity

[Damien Le Moal]

On 2021/05/19 10:26, Damien Le Moal wrote:
> 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 at wdc.com>
> ---
>  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);
> 

Hi Mike,

I just realized that I forgot to add:

Cc: stable at vger.kernel.org # v5.9+

to this patch.

Should I resend ? Or can you add this tag when applying the patch ?

Thanks !

-- 
Damien Le Moal
Western Digital Research