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null_blk: Support REQ_OP_ZONE_APPEND 

Support REQ_OP_ZONE_APPEND requests for null_blk devices with zoned
mode enabled. Use the internally tracked zone write pointer position
as the actual write position and return it using the command request
__sector field in the case of an mq device and using the command BIO
sector in the case of a BIO device.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Damien Le Moal 2020-05-12 17:55:52 +09:00 committed by Jens Axboe
parent 5795eb4430
commit e0489ed5da
1 changed files with 29 additions and 8 deletions
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37
drivers/block/null_blk_zoned.c
View File

@ -70,13 +70,20 @@ int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q)
int null_register_zoned_dev(struct nullb *nullb)
{
struct nullb_device *dev = nullb->dev;
struct request_queue *q = nullb->q;
if (queue_is_mq(q))
return blk_revalidate_disk_zones(nullb->disk, NULL);
if (queue_is_mq(q)) {
int ret = blk_revalidate_disk_zones(nullb->disk, NULL);
blk_queue_chunk_sectors(q, nullb->dev->zone_size_sects);
q->nr_zones = blkdev_nr_zones(nullb->disk);
if (ret)
return ret;
} else {
blk_queue_chunk_sectors(q, dev->zone_size_sects);
q->nr_zones = blkdev_nr_zones(nullb->disk);
}
blk_queue_max_zone_append_sectors(q, dev->zone_size_sects);
return 0;
}
@ -138,7 +145,7 @@ size_t null_zone_valid_read_len(struct nullb *nullb,
}
static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
unsigned int nr_sectors)
unsigned int nr_sectors, bool append)
{
struct nullb_device *dev = cmd->nq->dev;
unsigned int zno = null_zone_no(dev, sector);
@ -158,9 +165,21 @@ static blk_status_t null_zone_write(struct nullb_cmd *cmd, sector_t sector,
case BLK_ZONE_COND_IMP_OPEN:
case BLK_ZONE_COND_EXP_OPEN:
case BLK_ZONE_COND_CLOSED:
/* Writes must be at the write pointer position */
if (sector != zone->wp)
/*
* Regular writes must be at the write pointer position.
* Zone append writes are automatically issued at the write
* pointer and the position returned using the request or BIO
* sector.
*/
if (append) {
sector = zone->wp;
if (cmd->bio)
cmd->bio->bi_iter.bi_sector = sector;
else
cmd->rq->__sector = sector;
} else if (sector != zone->wp) {
return BLK_STS_IOERR;
}
if (zone->cond != BLK_ZONE_COND_EXP_OPEN)
zone->cond = BLK_ZONE_COND_IMP_OPEN;
@ -242,7 +261,9 @@ blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_opf op,
{
switch (op) {
case REQ_OP_WRITE:
return null_zone_write(cmd, sector, nr_sectors);
return null_zone_write(cmd, sector, nr_sectors, false);
case REQ_OP_ZONE_APPEND:
return null_zone_write(cmd, sector, nr_sectors, true);
case REQ_OP_ZONE_RESET:
case REQ_OP_ZONE_RESET_ALL:
case REQ_OP_ZONE_OPEN: