ublk: zoned: support REQ_OP_ZONE_RESET_ALL

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: Niklas Cassel <[email protected]>
Cc: Damien Le Moal <[email protected]>
Cc: Andreas Hindborg <[email protected]>
Signed-off-by: Ming Lei <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: Ming Lei

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) {
@@ -404,9 +408,8 @@ 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 */
+		/* We do not support drv_out */
 		return BLK_STS_NOTSUPP;
 	default:
 		return BLK_STS_IOERR;

include/uapi/linux/ublk_cmd.h

@@ -245,6 +245,7 @@ struct ublksrv_ctrl_dev_info {
 #define		UBLK_IO_OP_ZONE_CLOSE		11
 #define		UBLK_IO_OP_ZONE_FINISH		12
 #define		UBLK_IO_OP_ZONE_APPEND		13
+#define		UBLK_IO_OP_ZONE_RESET_ALL	14
 #define		UBLK_IO_OP_ZONE_RESET		15
 /*
  * Construct a zone report. The report request is carried in `struct