linux/drivers/block/null_blk_zoned.c
Christoph Hellwig e76239a374 block: add a report_zones method
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>
2018-10-25 11:17:40 -06:00

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;
}