Message-ID: <ZBQ3sgoN8oX5HXOJ@x1-carbon>
Date:   Fri, 17 Mar 2023 09:49:41 +0000
From:   Niklas Cassel <Niklas.Cassel@....com>
To:     Andreas Hindborg <nmi@...aspace.dk>
CC:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        Hans Holmberg <Hans.Holmberg@....com>,
        Matias Bjørling <Matias.Bjorling@....com>,
        Minwoo Im <minwoo.im.dev@...il.com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Jens Axboe <axboe@...nel.dk>, Ming Lei <ming.lei@...hat.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] block: ublk: enable zoned storage support

On Thu, Mar 16, 2023 at 03:55:38PM +0100, Andreas Hindborg wrote:
> From: Andreas Hindborg <a.hindborg@...sung.com>

Hello Andreas,


I think that this patch is starting to look very nice!


> 
> Add zoned storage support to ublk: report_zones and operations:
>  - REQ_OP_ZONE_OPEN
>  - REQ_OP_ZONE_CLOSE
>  - REQ_OP_ZONE_FINISH
>  - REQ_OP_ZONE_RESET
> 
> This allows implementation of zoned storage devices in user space. An
> example user space implementation based on ubdsrv is available [1].
> 
> [1] https://github.com/metaspace/ubdsrv/commit/2c60b9ffdfb7cb44c5cce0272bb52229ea6c95d4
> 
> Signed-off-by: Andreas Hindborg <a.hindborg@...sung.com>
> ---
> 
> Changes since v2:
>  - Allow reporting of multiple zones in a single request
>  - Move zoned functions to separate translation unit
>  - Do not overload REQ_OP_DRV_IN for zone report
>  - Reserve space in ublk_param_zoned for future parameters
>  - Do not overload (struct request).__sector and .__data_len
>  - Remove unnecessary conditional compilation 
>  - Remove goto statements in ublk_report_zones
> 
> v1: https://lore.kernel.org/linux-block/20230224125950.214779-1-nmi@metaspace.dk/
> v2: https://lore.kernel.org/all/20230224200502.391570-1-nmi@metaspace.dk/
> 
>  drivers/block/Kconfig          |   4 +
>  drivers/block/Makefile         |   1 +
>  drivers/block/ublk_drv-zoned.c | 142 +++++++++++++++++++++++++++++++++
>  drivers/block/ublk_drv.c       | 113 ++++++++++++++------------
>  drivers/block/ublk_drv.h       |  69 ++++++++++++++++
>  include/uapi/linux/ublk_cmd.h  |  37 +++++++--
>  6 files changed, 308 insertions(+), 58 deletions(-)
>  create mode 100644 drivers/block/ublk_drv-zoned.c
>  create mode 100644 drivers/block/ublk_drv.h
> 
> diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
> index f79f20430ef7..311e401eece5 100644
> --- a/drivers/block/Kconfig
> +++ b/drivers/block/Kconfig
> @@ -385,6 +385,10 @@ config BLK_DEV_UBLK
>  	  can handle batch more effectively, but task_work_add() isn't exported
>  	  for module, so ublk has to be built to kernel.
>  
> +config BLK_DEV_UBLK_ZONED
> +	def_bool y
> +	depends on BLK_DEV_UBLK && BLK_DEV_ZONED
> +
>  source "drivers/block/rnbd/Kconfig"
>  
>  endif # BLK_DEV
> diff --git a/drivers/block/Makefile b/drivers/block/Makefile
> index 101612cba303..0de9379ba9df 100644
> --- a/drivers/block/Makefile
> +++ b/drivers/block/Makefile
> @@ -38,5 +38,6 @@ obj-$(CONFIG_BLK_DEV_RNBD)	+= rnbd/
>  obj-$(CONFIG_BLK_DEV_NULL_BLK)	+= null_blk/
>  
>  obj-$(CONFIG_BLK_DEV_UBLK)			+= ublk_drv.o
> +obj-$(CONFIG_BLK_DEV_UBLK_ZONED)		+= ublk_drv-zoned.o
>  
>  swim_mod-y	:= swim.o swim_asm.o
> diff --git a/drivers/block/ublk_drv-zoned.c b/drivers/block/ublk_drv-zoned.c
> new file mode 100644
> index 000000000000..fbcbe1bbf653
> --- /dev/null
> +++ b/drivers/block/ublk_drv-zoned.c
> @@ -0,0 +1,142 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2023 Andreas Hindborg <a.hindborg@...sung.com>
> + */
> +#include <linux/blkzoned.h>
> +#include <linux/ublk_cmd.h>
> +#include "ublk_drv.h"
> +
> +void ublk_set_nr_zones(struct ublk_device *ub)
> +{
> +	const struct ublk_param_basic *p = &ub->params.basic;
> +
> +	if (ub->dev_info.flags & UBLK_F_ZONED && p->chunk_sectors)
> +		ub->ub_disk->nr_zones = p->dev_sectors / p->chunk_sectors;
> +}
> +
> +void ublk_dev_param_zoned_apply(struct ublk_device *ub)
> +{
> +	const struct ublk_param_zoned *p = &ub->params.zoned;
> +
> +	if (ub->dev_info.flags & UBLK_F_ZONED) {
> +		disk_set_max_active_zones(ub->ub_disk, p->max_active_zones);
> +		disk_set_max_open_zones(ub->ub_disk, p->max_open_zones);
> +	}
> +}
> +
> +int ublk_revalidate_disk_zones(struct gendisk *disk)
> +{
> +	return blk_revalidate_disk_zones(disk, NULL);
> +}
> +
> +// Based on virtblk_alloc_report_buffer

Change from C++ style to C style comment.

> +static void *ublk_alloc_report_buffer(struct ublk_device *ublk,
> +				      unsigned int nr_zones,
> +				      unsigned int zone_sectors, size_t *buflen)
> +{
> +	struct request_queue *q = ublk->ub_disk->queue;
> +	size_t bufsize;
> +	void *buf;
> +
> +	nr_zones = min_t(unsigned int, nr_zones,
> +			 get_capacity(ublk->ub_disk) >> ilog2(zone_sectors));
> +
> +	bufsize = nr_zones * sizeof(struct blk_zone);
> +	bufsize =
> +		min_t(size_t, bufsize, queue_max_hw_sectors(q) << SECTOR_SHIFT);
> +	bufsize = min_t(size_t, bufsize, queue_max_segments(q) << PAGE_SHIFT);
> +
> +	while (bufsize >= sizeof(struct blk_zone)) {
> +		buf = __vmalloc(bufsize, GFP_KERNEL | __GFP_NORETRY);
> +		if (buf) {
> +			*buflen = bufsize;
> +			return buf;
> +		}
> +		bufsize >>= 1;
> +	}
> +
> +	bufsize = 0;
> +	return NULL;
> +}
> +
> +int ublk_report_zones(struct gendisk *disk, sector_t sector,
> +		      unsigned int nr_zones, report_zones_cb cb, void *data)
> +{
> +	unsigned int done_zones = 0;
> +	struct ublk_device *ub = disk->private_data;
> +	unsigned int zone_size_sectors = disk->queue->limits.chunk_sectors;
> +	unsigned int first_zone = sector >> ilog2(zone_size_sectors);
> +	struct blk_zone *buffer;
> +	size_t buffer_length;
> +	unsigned int max_zones_per_request;

Nit: I would sort the variables differently.

Perhaps:
> +	struct ublk_device *ub = disk->private_data;
> +	unsigned int zone_size_sectors = disk->queue->limits.chunk_sectors;
> +	unsigned int first_zone = sector >> ilog2(zone_size_sectors);
> +	unsigned int done_zones = 0;
> +	unsigned int max_zones_per_request;
> +	struct blk_zone *buffer;
> +	size_t buffer_length;


> +
> +	if (!(ub->dev_info.flags & UBLK_F_ZONED))
> +		return -EOPNOTSUPP;
> +
> +	nr_zones = min_t(unsigned int, ub->ub_disk->nr_zones - first_zone,
> +			 nr_zones);
> +
> +	buffer = ublk_alloc_report_buffer(ub, nr_zones, zone_size_sectors,
> +					  &buffer_length);
> +	if (!buffer)
> +		return -ENOMEM;
> +
> +	max_zones_per_request = buffer_length / sizeof(struct blk_zone);
> +
> +	while (done_zones < nr_zones) {
> +		unsigned int remaining_zones = nr_zones - done_zones;
> +		unsigned int zones_in_request = min_t(
> +			unsigned int, remaining_zones, max_zones_per_request);
> +		int err = 0;
> +		struct request *req;
> +		struct ublk_rq_data *pdu;
> +		blk_status_t status;
> +
> +		memset(buffer, 0, buffer_length);
> +
> +		req = blk_mq_alloc_request(disk->queue, REQ_OP_DRV_IN, 0);
> +		if (IS_ERR(req))
> +			return PTR_ERR(req);
> +
> +		pdu = blk_mq_rq_to_pdu(req);
> +		pdu->operation = UBLK_IO_OP_REPORT_ZONES;
> +		pdu->sector = sector;
> +		pdu->nr_sectors = remaining_zones * zone_size_sectors;
> +
> +		err = blk_rq_map_kern(disk->queue, req, buffer, buffer_length,
> +					GFP_KERNEL);
> +		if (err) {
> +			blk_mq_free_request(req);
> +			kvfree(buffer);
> +			return err;
> +		}
> +
> +		status = blk_execute_rq(req, 0);
> +		err = blk_status_to_errno(status);
> +		blk_mq_free_request(req);
> +		if (err) {
> +			kvfree(buffer);
> +			return err;
> +		}
> +
> +		for (unsigned int i = 0; i < zones_in_request; i++) {
> +			struct blk_zone *zone = buffer + i;
> +
> +			err = cb(zone, i, data);
> +			if (err)
> +				return err;
> +
> +			done_zones++;
> +			sector += zone_size_sectors;
> +
> +			/* A zero length zone means don't ask for more zones */
> +			if (!zone->len) {
> +				kvfree(buffer);
> +				return done_zones;
> +			}
> +		}
> +	}
> +
> +	kvfree(buffer);
> +	return done_zones;
> +}
> diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
> index d1d1c8d606c8..69a3e7dedfc0 100644
> --- a/drivers/block/ublk_drv.c
> +++ b/drivers/block/ublk_drv.c
> @@ -44,6 +44,7 @@
>  #include <linux/task_work.h>
>  #include <linux/namei.h>
>  #include <uapi/linux/ublk_cmd.h>
> +#include "ublk_drv.h"
>  
>  #define UBLK_MINORS		(1U << MINORBITS)
>  
> @@ -53,16 +54,13 @@
>  		| UBLK_F_NEED_GET_DATA \
>  		| UBLK_F_USER_RECOVERY \
>  		| UBLK_F_USER_RECOVERY_REISSUE \
> -		| UBLK_F_UNPRIVILEGED_DEV)
> +		| UBLK_F_UNPRIVILEGED_DEV \
> +		| UBLK_F_ZONED)
>  
>  /* All UBLK_PARAM_TYPE_* should be included here */
> -#define UBLK_PARAM_TYPE_ALL (UBLK_PARAM_TYPE_BASIC | \
> -		UBLK_PARAM_TYPE_DISCARD | UBLK_PARAM_TYPE_DEVT)
> -
> -struct ublk_rq_data {
> -	struct llist_node node;
> -	struct callback_head work;
> -};
> +#define UBLK_PARAM_TYPE_ALL                                \
> +	(UBLK_PARAM_TYPE_BASIC | UBLK_PARAM_TYPE_DISCARD | \
> +	 UBLK_PARAM_TYPE_DEVT | UBLK_PARAM_TYPE_ZONED)
>  
>  struct ublk_uring_cmd_pdu {
>  	struct ublk_queue *ubq;
> @@ -135,45 +133,6 @@ struct ublk_queue {
>  
>  #define UBLK_DAEMON_MONITOR_PERIOD	(5 * HZ)
>  
> -struct ublk_device {
> -	struct gendisk		*ub_disk;
> -
> -	char	*__queues;
> -
> -	unsigned int	queue_size;
> -	struct ublksrv_ctrl_dev_info	dev_info;
> -
> -	struct blk_mq_tag_set	tag_set;
> -
> -	struct cdev		cdev;
> -	struct device		cdev_dev;
> -
> -#define UB_STATE_OPEN		0
> -#define UB_STATE_USED		1
> -#define UB_STATE_DELETED	2
> -	unsigned long		state;
> -	int			ub_number;
> -
> -	struct mutex		mutex;
> -
> -	spinlock_t		mm_lock;
> -	struct mm_struct	*mm;
> -
> -	struct ublk_params	params;
> -
> -	struct completion	completion;
> -	unsigned int		nr_queues_ready;
> -	unsigned int		nr_privileged_daemon;
> -
> -	/*
> -	 * Our ubq->daemon may be killed without any notification, so
> -	 * monitor each queue's daemon periodically
> -	 */
> -	struct delayed_work	monitor_work;
> -	struct work_struct	quiesce_work;
> -	struct work_struct	stop_work;
> -};
> -

I think that this change should go into a patch 1/2 that is simply
create a driver internal header file and move appropriate code.


>  /* header of ublk_params */
>  struct ublk_params_header {
>  	__u32	len;
> @@ -225,6 +184,9 @@ static void ublk_dev_param_basic_apply(struct ublk_device *ub)
>  		set_disk_ro(ub->ub_disk, true);
>  
>  	set_capacity(ub->ub_disk, p->dev_sectors);
> +
> +	if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
> +		ublk_set_nr_zones(ub);
>  }
>  
>  static void ublk_dev_param_discard_apply(struct ublk_device *ub)
> @@ -285,6 +247,9 @@ static int ublk_apply_params(struct ublk_device *ub)
>  	if (ub->params.types & UBLK_PARAM_TYPE_DISCARD)
>  		ublk_dev_param_discard_apply(ub);
>  
> +	if (IS_ENABLED(CONFIG_BLK_DEV_ZONED) && (ub->params.types & UBLK_PARAM_TYPE_ZONED))
> +		ublk_dev_param_zoned_apply(ub);
> +
>  	return 0;
>  }
>  
> @@ -420,9 +385,10 @@ static int ublk_open(struct block_device *bdev, fmode_t mode)
>  }
>  
>  static const struct block_device_operations ub_fops = {
> -	.owner =	THIS_MODULE,
> -	.open =		ublk_open,
> -	.free_disk =	ublk_free_disk,
> +	.owner = THIS_MODULE,
> +	.open = ublk_open,
> +	.free_disk = ublk_free_disk,
> +	.report_zones = ublk_report_zones,
>  };
>  
>  #define UBLK_MAX_PIN_PAGES	32
> @@ -558,7 +524,7 @@ static int ublk_unmap_io(const struct ublk_queue *ubq,
>  {
>  	const unsigned int rq_bytes = blk_rq_bytes(req);
>  
> -	if (req_op(req) == REQ_OP_READ && ublk_rq_has_data(req)) {
> +	if ((req_op(req) == REQ_OP_READ || req_op(req) == REQ_OP_DRV_IN) && ublk_rq_has_data(req)) {
>  		struct ublk_map_data data = {
>  			.ubq	=	ubq,
>  			.rq	=	req,
> @@ -607,6 +573,7 @@ static blk_status_t ublk_setup_iod(struct ublk_queue *ubq, struct request *req)
>  {
>  	struct ublksrv_io_desc *iod = ublk_get_iod(ubq, req->tag);
>  	struct ublk_io *io = &ubq->ios[req->tag];
> +	struct ublk_rq_data *pdu = blk_mq_rq_to_pdu(req);
>  	u32 ublk_op;
>  
>  	switch (req_op(req)) {
> @@ -625,6 +592,35 @@ static blk_status_t ublk_setup_iod(struct ublk_queue *ubq, struct request *req)
>  	case REQ_OP_WRITE_ZEROES:
>  		ublk_op = UBLK_IO_OP_WRITE_ZEROES;
>  		break;
> +	case REQ_OP_ZONE_OPEN:
> +		ublk_op = UBLK_IO_OP_ZONE_OPEN;
> +		break;
> +	case REQ_OP_ZONE_CLOSE:
> +		ublk_op = UBLK_IO_OP_ZONE_CLOSE;
> +		break;
> +	case REQ_OP_ZONE_FINISH:
> +		ublk_op = UBLK_IO_OP_ZONE_FINISH;
> +		break;
> +	case REQ_OP_ZONE_RESET:
> +		ublk_op = UBLK_IO_OP_ZONE_RESET;
> +		break;
> +	case REQ_OP_DRV_IN:
> +	case REQ_OP_DRV_OUT:
> +		ublk_op = pdu->operation;
> +		switch (ublk_op) {
> +		case UBLK_IO_OP_REPORT_ZONES:
> +			iod->op_flags = ublk_op | ublk_req_build_flags(req);
> +			iod->nr_sectors = pdu->nr_sectors;
> +			iod->start_sector = pdu->sector;
> +			iod->addr = io->addr;
> +			return BLK_STS_OK;
> +		default:
> +			return BLK_STS_IOERR;
> +		}
> +	case REQ_OP_ZONE_APPEND:
> +	case REQ_OP_ZONE_RESET_ALL:
> +		/* We do not support zone append or reset_all yet */
> +		fallthrough;
>  	default:
>  		return BLK_STS_IOERR;
>  	}
> @@ -671,7 +667,8 @@ static void ublk_complete_rq(struct request *req)
>  	 *
>  	 * Both the two needn't unmap.
>  	 */
> -	if (req_op(req) != REQ_OP_READ && req_op(req) != REQ_OP_WRITE) {
> +	if (req_op(req) != REQ_OP_READ && req_op(req) != REQ_OP_WRITE &&
> +	    req_op(req) != REQ_OP_DRV_IN) {
>  		blk_mq_end_request(req, BLK_STS_OK);
>  		return;
>  	}
> @@ -1601,6 +1598,15 @@ static int ublk_ctrl_start_dev(struct ublk_device *ub, struct io_uring_cmd *cmd)
>  	if (ub->nr_privileged_daemon != ub->nr_queues_ready)
>  		set_bit(GD_SUPPRESS_PART_SCAN, &disk->state);
>  
> +	if (IS_ENABLED(CONFIG_BLK_DEV_ZONED) &&
> +	    ub->dev_info.flags & UBLK_F_ZONED) {
> +		disk_set_zoned(disk, BLK_ZONED_HM);
> +		blk_queue_required_elevator_features(disk->queue, ELEVATOR_F_ZBD_SEQ_WRITE);
> +		ret = ublk_revalidate_disk_zones(disk);
> +		if (ret)
> +			goto out_put_disk;
> +	}
> +
>  	get_device(&ub->cdev_dev);
>  	ret = add_disk(disk);
>  	if (ret) {
> @@ -1746,6 +1752,9 @@ static int ublk_ctrl_add_dev(struct io_uring_cmd *cmd)
>  	if (!IS_BUILTIN(CONFIG_BLK_DEV_UBLK))
>  		ub->dev_info.flags |= UBLK_F_URING_CMD_COMP_IN_TASK;
>  
> +	if (!IS_ENABLED(CONFIG_BLK_DEV_ZONED))
> +		ub->dev_info.flags &= ~UBLK_F_ZONED;
> +
>  	/* We are not ready to support zero copy */
>  	ub->dev_info.flags &= ~UBLK_F_SUPPORT_ZERO_COPY;
>  
> diff --git a/drivers/block/ublk_drv.h b/drivers/block/ublk_drv.h
> new file mode 100644
> index 000000000000..7b21235d7673
> --- /dev/null
> +++ b/drivers/block/ublk_drv.h
> @@ -0,0 +1,69 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +#ifndef _UBLK_DRV_H
> +#define _UBLK_DRV_H
> +
> +#include <uapi/linux/ublk_cmd.h>
> +#include <linux/blk-mq.h>
> +#include <linux/cdev.h>
> +
> +struct ublk_device {
> +	struct gendisk *ub_disk;
> +
> +	char *__queues;
> +
> +	unsigned int queue_size;
> +	struct ublksrv_ctrl_dev_info dev_info;
> +
> +	struct blk_mq_tag_set tag_set;
> +
> +	struct cdev cdev;
> +	struct device cdev_dev;
> +
> +#define UB_STATE_OPEN 0
> +#define UB_STATE_USED 1
> +#define UB_STATE_DELETED 2
> +	unsigned long state;
> +	int ub_number;
> +
> +	struct mutex mutex;
> +
> +	spinlock_t mm_lock;
> +	struct mm_struct *mm;
> +
> +	struct ublk_params params;
> +
> +	struct completion completion;
> +	unsigned int nr_queues_ready;
> +	unsigned int nr_privileged_daemon;
> +
> +	/*
> +	 * Our ubq->daemon may be killed without any notification, so
> +	 * monitor each queue's daemon periodically
> +	 */
> +	struct delayed_work monitor_work;
> +	struct work_struct quiesce_work;
> +	struct work_struct stop_work;
> +};
> +
> +struct ublk_rq_data {
> +	struct llist_node node;
> +	struct callback_head work;
> +	enum ublk_op operation;
> +	__u64 sector;
> +	__u32 nr_sectors;
> +};
> +
> +void ublk_set_nr_zones(struct ublk_device *ub);
> +void ublk_dev_param_zoned_apply(struct ublk_device *ub);
> +int ublk_revalidate_disk_zones(struct gendisk *disk);
> +
> +#ifdef CONFIG_BLK_DEV_UBLK_ZONED
> +int ublk_report_zones(struct gendisk *disk, sector_t sector,
> +		      unsigned int nr_zones, report_zones_cb cb,
> +		      void *data);
> +#else
> +#define ublk_report_zones NULL
> +#endif
> +
> +#endif
> diff --git a/include/uapi/linux/ublk_cmd.h b/include/uapi/linux/ublk_cmd.h
> index f6238ccc7800..a9c3e71b0756 100644
> --- a/include/uapi/linux/ublk_cmd.h
> +++ b/include/uapi/linux/ublk_cmd.h
> @@ -102,6 +102,11 @@
>   */
>  #define UBLK_F_UNPRIVILEGED_DEV	(1UL << 5)
>  
> +/*
> + * Enable zoned device support
> + */
> +#define UBLK_F_ZONED (1ULL << 6)
> +
>  /* device state */
>  #define UBLK_S_DEV_DEAD	0
>  #define UBLK_S_DEV_LIVE	1
> @@ -155,12 +160,24 @@ struct ublksrv_ctrl_dev_info {
>  	__u64   reserved2;
>  };
>  
> -#define		UBLK_IO_OP_READ		0
> -#define		UBLK_IO_OP_WRITE		1
> -#define		UBLK_IO_OP_FLUSH		2
> -#define		UBLK_IO_OP_DISCARD	3
> -#define		UBLK_IO_OP_WRITE_SAME	4
> -#define		UBLK_IO_OP_WRITE_ZEROES	5
> +enum ublk_op {
> +	UBLK_IO_OP_READ = 0,
> +	UBLK_IO_OP_WRITE = 1,
> +	UBLK_IO_OP_FLUSH = 2,
> +	UBLK_IO_OP_DISCARD = 3,
> +	UBLK_IO_OP_WRITE_SAME = 4,
> +	UBLK_IO_OP_WRITE_ZEROES = 5,
> +	UBLK_IO_OP_ZONE_OPEN = 10,
> +	UBLK_IO_OP_ZONE_CLOSE = 11,
> +	UBLK_IO_OP_ZONE_FINISH = 12,
> +	UBLK_IO_OP_ZONE_APPEND = 13,
> +	UBLK_IO_OP_ZONE_RESET = 15,
> +	__UBLK_IO_OP_DRV_IN_START = 32,
> +	UBLK_IO_OP_REPORT_ZONES = __UBLK_IO_OP_DRV_IN_START,
> +	__UBLK_IO_OP_DRV_IN_END = 96,
> +	__UBLK_IO_OP_DRV_OUT_START = __UBLK_IO_OP_DRV_IN_END,
> +	__UBLK_IO_OP_DRV_OUT_END = 160,
> +};

This also looks like a separate change.
I would put it into a patch 2/3.


Have a nice weekend!


Kind regards,
Niklas

>  
>  #define		UBLK_IO_F_FAILFAST_DEV		(1U << 8)
>  #define		UBLK_IO_F_FAILFAST_TRANSPORT	(1U << 9)
> @@ -257,6 +274,12 @@ struct ublk_param_devt {
>  	__u32   disk_minor;
>  };
>  
> +struct ublk_param_zoned {
> +	__u32	max_open_zones;
> +	__u32	max_active_zones;
> +	__u8	reserved[24];
> +};
> +
>  struct ublk_params {
>  	/*
>  	 * Total length of parameters, userspace has to set 'len' for both
> @@ -268,11 +291,13 @@ struct ublk_params {
>  #define UBLK_PARAM_TYPE_BASIC           (1 << 0)
>  #define UBLK_PARAM_TYPE_DISCARD         (1 << 1)
>  #define UBLK_PARAM_TYPE_DEVT            (1 << 2)
> +#define UBLK_PARAM_TYPE_ZONED           (1 << 3)
>  	__u32	types;			/* types of parameter included */
>  
>  	struct ublk_param_basic		basic;
>  	struct ublk_param_discard	discard;
>  	struct ublk_param_devt		devt;
> +	struct ublk_param_zoned	zoned;
>  };
>  
>  #endif
> 
> base-commit: eeac8ede17557680855031c6f305ece2378af326
> -- 
> 2.39.2
> 

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