mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 16:45:25 +07:00
e76239a374
Dispatching a report zones command through the request queue is a major pain due to the command reply payload rewriting necessary. Given that blkdev_report_zones() is executing everything synchronously, implement report zones as a block device file operation instead, allowing major simplification of the code in many places. sd, null-blk, dm-linear and dm-flakey being the only block device drivers supporting exposing zoned block devices, these drivers are modified to provide the device side implementation of the report_zones() block device file operation. For device mappers, a new report_zones() target type operation is defined so that the upper block layer calls blkdev_report_zones() can be propagated down to the underlying devices of the dm targets. Implementation for this new operation is added to the dm-linear and dm-flakey targets. Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Christoph Hellwig <hch@lst.de> [Damien] * Changed method block_device argument to gendisk * Various bug fixes and improvements * Added support for null_blk, dm-linear and dm-flakey. Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
117 lines
2.7 KiB
C
117 lines
2.7 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;
|
|
|
|
for (i = 0; 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;
|
|
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];
|
|
|
|
zone->cond = BLK_ZONE_COND_EMPTY;
|
|
zone->wp = zone->start;
|
|
}
|