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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: Matias Bjorling <matias.bjorling@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Masato Suzuki <masato.suzuki@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Masato Suzuki 2018-10-30 16:14:05 +09:00 committed by Jens Axboe
parent 85758777c2
commit ea2c18e104
3 changed files with 34 additions and 1 deletions
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1
drivers/block/null_blk.h
View File

@ -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 */

7
drivers/block/null_blk_main.c
View File

@ -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;
}

27
drivers/block/null_blk_zoned.c
View File

@ -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;
}