[dm-devel] [PATCH v3 03/11] block: introduce BIO_ZONE_WRITE_LOCKED bio flag

[Chaitanya Kulkarni]

On 5/20/21 20:01, Damien Le Moal wrote:
> Introduce the BIO flag BIO_ZONE_WRITE_LOCKED to indicate that a BIO owns
> the write lock of the zone it is targeting. This is the counterpart of
> the struct request flag RQF_ZONE_WRITE_LOCKED.
>
> This new BIO flag is reserved for now for zone write locking control
> for device mapper targets exposing a zoned block device. Since in this
> case, the lock flag must not be propagated to the struct request that
> will be used to process the BIO, a BIO private flag is used rather than
> changing the RQF_ZONE_WRITE_LOCKED request flag into a common REQ_XXX
> flag that could be used for both BIO and request. This avoids conflicts
> down the stack with the block IO scheduler zone write locking
> (in mq-deadline).
>
> Signed-off-by: Damien Le Moal <damien.lemoal at wdc.com>
> Reviewed-by: Christoph Hellwig <hch at lst.de>
> Reviewed-by: Hannes Reinecke <hare at suse.de>
> ---

Looks good.

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>