[PATCH v7 23/28] block: Do not check zone type in blk_check_zone_append()

Damien Le Moal
2024-04-08T01:42:13Z

Zone append operations are only allowed to target sequential write
required zones. blk_check_zone_append() uses bio_zone_is_seq() to check
this. However, this check is not necessary because:
1) For NVMe ZNS namespace devices, only sequential write required zones
exist, making the zone type check useless.
2) For null_blk, the driver will fail the request anyway, thus notifying
the user that a conventional zone was targeted.
3) For all other zoned devices, zone append is now emulated using zone
write plugging, which checks that a zone append operation does not
target a conventional zone.

In preparation for the removal of zone write locking and its
conventional zone bitmap (used by bio_zone_is_seq()), remove the
bio_zone_is_seq() call from blk_check_zone_append().

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Hans Holmberg <hans.holmberg@wdc.com>
Tested-by: Dennis Maisenbacher <dennis.maisenbacher@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
---
block/blk-core.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 3bf28149e104..e1a5344c2257 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -589,8 +589,7 @@ static inline blk_status_t blk_check_zone_append(struct request_queue *q,
return BLK_STS_NOTSUPP;

/* The bio sector must point to the start of a sequential zone */
- if (!bdev_is_zone_start(bio->bi_bdev, bio->bi_iter.bi_sector) ||
- !bio_zone_is_seq(bio))
+ if (!bdev_is_zone_start(bio->bi_bdev, bio->bi_iter.bi_sector))
return BLK_STS_IOERR;

/*
--
2.44.0