From: Damien Le Moal <damien.lemoal@xxxxxxx>
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.
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
---
drivers/block/null_blk_zoned.c | 39 +++++++++++++++++++++++++++-------
1 file changed, 31 insertions(+), 8 deletions(-)
diff --git a/drivers/block/null_blk_zoned.c b/drivers/block/null_blk_zoned.c
index 46641df2e58e..5c70e0c7e862 100644
--- a/drivers/block/null_blk_zoned.c
+++ b/drivers/block/null_blk_zoned.c
@@ -70,13 +70,22 @@ 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);
+
+ if (ret)
+ return ret;
+ } else {
+ blk_queue_chunk_sectors(q, dev->zone_size_sects);
+ q->nr_zones = blkdev_nr_zones(nullb->disk);
+ }
- blk_queue_chunk_sectors(q, nullb->dev->zone_size_sects);
- q->nr_zones = blkdev_nr_zones(nullb->disk);
+ blk_queue_max_zone_append_sectors(q,
+ min_t(sector_t, q->limits.max_hw_sectors,
+ dev->zone_size_sects));
return 0;
}
@@ -138,7 +147,7 @@ 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 +167,21 @@ 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 +263,9 @@ 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:
--
2.24.1
