Re: [PATCH] ublk: zoned: support REQ_OP_ZONE_RESET_ALL

[Ming Lei <ming.lei@redhat.com>]

On Thu, Aug 10, 2023 at 11:51:38AM +0000, Niklas Cassel wrote:
> Hello Ming,
> 
> On Thu, Aug 10, 2023 at 05:20:57PM +0800, Ming Lei wrote:
> > There isn't any reason to not support REQ_OP_ZONE_RESET_ALL given everything
> > is actually handled in userspace, not mention it is pretty easy to support
> > RESET_ALL.
> > 
> > So enable REQ_OP_ZONE_RESET_ALL and let userspace handle it.
> > 
> > Verified by 'tools/zbc_reset_zone -all /dev/ublkb0' in libzbc[1] with
> > libublk-rs based ublk-zoned target prototype[2], follows command line
> > for creating ublk-zoned:
> > 
> > 	cargo run --example zoned -- add -1 1024	# add $dev_id $DEV_SIZE
> > 
> > [1] https://github.com/westerndigitalcorporation/libzbc
> > [2] https://github.com/ming1/libublk-rs/tree/zoned.v2
> > 
> > Cc: Damien Le Moal <dlemoal@kernel.org>
> > Cc: Andreas Hindborg <a.hindborg@samsung.com>
> > Signed-off-by: Ming Lei <ming.lei@redhat.com>
> > ---
> >  drivers/block/ublk_drv.c      | 5 ++++-
> >  include/uapi/linux/ublk_cmd.h | 1 +
> >  2 files changed, 5 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
> > index 109a5b17537d..939e4584485b 100644
> > --- a/drivers/block/ublk_drv.c
> > +++ b/drivers/block/ublk_drv.c
> > @@ -251,6 +251,7 @@ static int ublk_dev_param_zoned_apply(struct ublk_device *ub)
> >  	const struct ublk_param_zoned *p = &ub->params.zoned;
> >  
> >  	disk_set_zoned(ub->ub_disk, BLK_ZONED_HM);
> > +	blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, ub->ub_disk->queue);
> >  	blk_queue_required_elevator_features(ub->ub_disk->queue,
> >  					     ELEVATOR_F_ZBD_SEQ_WRITE);
> >  	disk_set_max_active_zones(ub->ub_disk, p->max_active_zones);
> > @@ -393,6 +394,9 @@ static blk_status_t ublk_setup_iod_zoned(struct ublk_queue *ubq,
> >  	case REQ_OP_ZONE_APPEND:
> >  		ublk_op = UBLK_IO_OP_ZONE_APPEND;
> >  		break;
> > +	case REQ_OP_ZONE_RESET_ALL:
> > +		ublk_op = UBLK_IO_OP_ZONE_RESET_ALL;
> > +		break;
> >  	case REQ_OP_DRV_IN:
> >  		ublk_op = pdu->operation;
> >  		switch (ublk_op) {
> > @@ -404,7 +408,6 @@ static blk_status_t ublk_setup_iod_zoned(struct ublk_queue *ubq,
> >  		default:
> >  			return BLK_STS_IOERR;
> >  		}
> > -	case REQ_OP_ZONE_RESET_ALL:
> >  	case REQ_OP_DRV_OUT:
> >  		/* We do not support reset_all and drv_out */
> 
> I think that you should also drop reset_all from this comment.

Good catch, will do it in v2.

Thanks,
Ming