[PATCH] ublk: zoned: support REQ_OP_ZONE_RESET_ALL

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

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 */
 		return BLK_STS_NOTSUPP;
diff --git a/include/uapi/linux/ublk_cmd.h b/include/uapi/linux/ublk_cmd.h
index 2685e53e4752..b9cfc5c96268 100644
--- a/include/uapi/linux/ublk_cmd.h
+++ b/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
-- 
2.40.1