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| author | Johannes Thumshirn <johannes.thumshirn@wdc.com> | 2020-05-12 17:55:48 +0900 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-05-12 20:36:28 -0600 |
| commit | 1392d37018d4f68c5bb2c98dae9a018b73926865 (patch) | |
| tree | 9bd4b688838406c57655576a41fbad66ab121598 /block | |
| parent | 0512a75b98f847c2e9a4b664013424e603e202f7 (diff) | |
| download | lwn-1392d37018d4f68c5bb2c98dae9a018b73926865.tar.gz lwn-1392d37018d4f68c5bb2c98dae9a018b73926865.zip | |
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')
| -rw-r--r-- | block/blk-zoned.c | 14 |
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), |