mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 12:28:41 +08:00
ea2c18e104
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>
142 lines
3.3 KiB
C
142 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/vmalloc.h>
|
|
#include "null_blk.h"
|
|
|
|
/* zone_size in MBs to sectors. */
|
|
#define ZONE_SIZE_SHIFT 11
|
|
|
|
static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect)
|
|
{
|
|
return sect >> ilog2(dev->zone_size_sects);
|
|
}
|
|
|
|
int null_zone_init(struct nullb_device *dev)
|
|
{
|
|
sector_t dev_size = (sector_t)dev->size * 1024 * 1024;
|
|
sector_t sector = 0;
|
|
unsigned int i;
|
|
|
|
if (!is_power_of_2(dev->zone_size)) {
|
|
pr_err("null_blk: zone_size must be power-of-two\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev->zone_size_sects = dev->zone_size << ZONE_SIZE_SHIFT;
|
|
dev->nr_zones = dev_size >>
|
|
(SECTOR_SHIFT + ilog2(dev->zone_size_sects));
|
|
dev->zones = kvmalloc_array(dev->nr_zones, sizeof(struct blk_zone),
|
|
GFP_KERNEL | __GFP_ZERO);
|
|
if (!dev->zones)
|
|
return -ENOMEM;
|
|
|
|
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;
|
|
zone->len = dev->zone_size_sects;
|
|
zone->type = BLK_ZONE_TYPE_SEQWRITE_REQ;
|
|
zone->cond = BLK_ZONE_COND_EMPTY;
|
|
|
|
sector += dev->zone_size_sects;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void null_zone_exit(struct nullb_device *dev)
|
|
{
|
|
kvfree(dev->zones);
|
|
}
|
|
|
|
int null_zone_report(struct gendisk *disk, sector_t sector,
|
|
struct blk_zone *zones, unsigned int *nr_zones,
|
|
gfp_t gfp_mask)
|
|
{
|
|
struct nullb *nullb = disk->private_data;
|
|
struct nullb_device *dev = nullb->dev;
|
|
unsigned int zno, nrz = 0;
|
|
|
|
if (!dev->zoned)
|
|
/* Not a zoned null device */
|
|
return -EOPNOTSUPP;
|
|
|
|
zno = null_zone_no(dev, sector);
|
|
if (zno < dev->nr_zones) {
|
|
nrz = min_t(unsigned int, *nr_zones, dev->nr_zones - zno);
|
|
memcpy(zones, &dev->zones[zno], nrz * sizeof(struct blk_zone));
|
|
}
|
|
|
|
*nr_zones = nrz;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void null_zone_write(struct nullb_cmd *cmd, sector_t sector,
|
|
unsigned int nr_sectors)
|
|
{
|
|
struct nullb_device *dev = cmd->nq->dev;
|
|
unsigned int zno = null_zone_no(dev, sector);
|
|
struct blk_zone *zone = &dev->zones[zno];
|
|
|
|
switch (zone->cond) {
|
|
case BLK_ZONE_COND_FULL:
|
|
/* Cannot write to a full zone */
|
|
cmd->error = BLK_STS_IOERR;
|
|
break;
|
|
case BLK_ZONE_COND_EMPTY:
|
|
case BLK_ZONE_COND_IMP_OPEN:
|
|
/* Writes must be at the write pointer position */
|
|
if (sector != zone->wp) {
|
|
cmd->error = BLK_STS_IOERR;
|
|
break;
|
|
}
|
|
|
|
if (zone->cond == BLK_ZONE_COND_EMPTY)
|
|
zone->cond = BLK_ZONE_COND_IMP_OPEN;
|
|
|
|
zone->wp += nr_sectors;
|
|
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;
|
|
break;
|
|
}
|
|
}
|
|
|
|
void null_zone_reset(struct nullb_cmd *cmd, sector_t sector)
|
|
{
|
|
struct nullb_device *dev = cmd->nq->dev;
|
|
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;
|
|
}
|