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authorJohannes Thumshirn <johannes.thumshirn@wdc.com>2020-05-12 17:55:48 +0900
committerJens Axboe <axboe@kernel.dk>2020-05-12 20:36:28 -0600
commit1392d37018d4f68c5bb2c98dae9a018b73926865 (patch)
tree9bd4b688838406c57655576a41fbad66ab121598 /block/blk-zoned.c
parent0512a75b98f847c2e9a4b664013424e603e202f7 (diff)
block: introduce blk_req_zone_write_trylock
Introduce blk_req_zone_write_trylock(), which either grabs the write-lock for a sequential zone or returns false, if the zone is already locked. Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-zoned.c')
-rw-r--r--block/blk-zoned.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index f87956e0dcaf..c822cfa7a102 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c
@@ -82,6 +82,20 @@ bool blk_req_needs_zone_write_lock(struct request *rq)
}
EXPORT_SYMBOL_GPL(blk_req_needs_zone_write_lock);
+bool blk_req_zone_write_trylock(struct request *rq)
+{
+ unsigned int zno = blk_rq_zone_no(rq);
+
+ if (test_and_set_bit(zno, rq->q->seq_zones_wlock))
+ return false;
+
+ WARN_ON_ONCE(rq->rq_flags & RQF_ZONE_WRITE_LOCKED);
+ rq->rq_flags |= RQF_ZONE_WRITE_LOCKED;
+
+ return true;
+}
+EXPORT_SYMBOL_GPL(blk_req_zone_write_trylock);
+
void __blk_req_zone_write_lock(struct request *rq)
{
if (WARN_ON_ONCE(test_and_set_bit(blk_rq_zone_no(rq),