Commit ea2c18e1 authored by Masato Suzuki's avatar Masato Suzuki Committed by Jens Axboe
Browse files

null_blk: Add conventional zone configuration for zoned support 



Allow the creation of conventional zones by adding the zone_nr_conv
configuration attribute. This new attribute is used only for zoned devices
and indicates the number of conventional zones to create. The default value
is 0. Since host-managed zoned block devices must always have at least one
sequential zone, if the value of zone_nr_conv is larger than or equal to
the total number of zones of the device nr_zones, zone_nr_conv is
automatically changed to nr_zones - 1.

Reviewed-by: default avatarMatias Bjorling <matias.bjorling@wdc.com>
Reviewed-by: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: default avatarMasato Suzuki <masato.suzuki@wdc.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 85758777

drivers/block/null_blk.h

+1 −0
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ struct nullb_device { 
	unsigned long completion_nsec; /* time in ns to complete a request */

	unsigned long cache_size; /* disk cache size in MB */

	unsigned long zone_size; /* zone size in MB if device is zoned */

	unsigned int zone_nr_conv; /* number of conventional zones */

	unsigned int submit_queues; /* number of submission queues */

	unsigned int home_node; /* home node for the device */

	unsigned int queue_mode; /* block interface */

drivers/block/null_blk_main.c

+7 −0
Original line number Diff line number Diff line
@@ -188,6 +188,10 @@ static unsigned long g_zone_size = 256; 
module_param_named(zone_size, g_zone_size, ulong, S_IRUGO);

MODULE_PARM_DESC(zone_size, "Zone size in MB when block device is zoned. Must be power-of-two: Default: 256");



static unsigned int g_zone_nr_conv;

module_param_named(zone_nr_conv, g_zone_nr_conv, uint, 0444);

MODULE_PARM_DESC(zone_nr_conv, "Number of conventional zones when block device is zoned. Default: 0");



static struct nullb_device *null_alloc_dev(void);

static void null_free_dev(struct nullb_device *dev);

static void null_del_dev(struct nullb *nullb);
@@ -293,6 +297,7 @@ NULLB_DEVICE_ATTR(mbps, uint); 
NULLB_DEVICE_ATTR(cache_size, ulong);

NULLB_DEVICE_ATTR(zoned, bool);

NULLB_DEVICE_ATTR(zone_size, ulong);

NULLB_DEVICE_ATTR(zone_nr_conv, uint);



static ssize_t nullb_device_power_show(struct config_item *item, char *page)

{
@@ -407,6 +412,7 @@ static struct configfs_attribute *nullb_device_attrs[] = { 
	&nullb_device_attr_badblocks,

	&nullb_device_attr_zoned,

	&nullb_device_attr_zone_size,

	&nullb_device_attr_zone_nr_conv,

	NULL,

};
@@ -520,6 +526,7 @@ static struct nullb_device *null_alloc_dev(void) 
	dev->use_per_node_hctx = g_use_per_node_hctx;

	dev->zoned = g_zoned;

	dev->zone_size = g_zone_size;

	dev->zone_nr_conv = g_zone_nr_conv;

	return dev;

}

drivers/block/null_blk_zoned.c

+26 −1
Original line number Diff line number Diff line
@@ -29,7 +29,25 @@ int null_zone_init(struct nullb_device *dev) 
	if (!dev->zones)

		return -ENOMEM;



	for (i = 0; i < dev->nr_zones; i++) {

	if (dev->zone_nr_conv >= dev->nr_zones) {

		dev->zone_nr_conv = dev->nr_zones - 1;

		pr_info("null_blk: changed the number of conventional zones to %u",

			dev->zone_nr_conv);

	}



	for (i = 0; i <  dev->zone_nr_conv; i++) {

		struct blk_zone *zone = &dev->zones[i];



		zone->start = sector;

		zone->len = dev->zone_size_sects;

		zone->wp = zone->start + zone->len;

		zone->type = BLK_ZONE_TYPE_CONVENTIONAL;

		zone->cond = BLK_ZONE_COND_NOT_WP;



		sector += dev->zone_size_sects;

	}



	for (i = dev->zone_nr_conv; i < dev->nr_zones; i++) {

		struct blk_zone *zone = &dev->zones[i];



		zone->start = zone->wp = sector;
@@ -98,6 +116,8 @@ void null_zone_write(struct nullb_cmd *cmd, sector_t sector, 
		if (zone->wp == zone->start + zone->len)

			zone->cond = BLK_ZONE_COND_FULL;

		break;

	case BLK_ZONE_COND_NOT_WP:

		break;

	default:

		/* Invalid zone condition */

		cmd->error = BLK_STS_IOERR;
@@ -111,6 +131,11 @@ void null_zone_reset(struct nullb_cmd *cmd, sector_t sector) 
	unsigned int zno = null_zone_no(dev, sector);

	struct blk_zone *zone = &dev->zones[zno];



	if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL) {

		cmd->error = BLK_STS_IOERR;

		return;

	}



	zone->cond = BLK_ZONE_COND_EMPTY;

	zone->wp = zone->start;

}

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