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

[Damien Le Moal]

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 at kernel.org>
Reviewed-by: Hannes Reinecke <hare at suse.de>
Reviewed-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Bart Van Assche <bvanassche at acm.org>
Tested-by: Hans Holmberg <hans.holmberg at wdc.com>
Tested-by: Dennis Maisenbacher <dennis.maisenbacher at wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen at 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