[PATCH v3 03/10] block: introduce blk_req_zone_write_trylock
From: Johannes Thumshirn <hidden>
Date: 2020-03-27 16:50:34
Also in:
linux-fsdevel, linux-scsi
Subsystem:
block layer, the rest, zoned block device (block layer) · Maintainers:
Jens Axboe, Linus Torvalds, Damien Le Moal
Signed-off-by: Johannes Thumshirn <redacted> --- block/blk-zoned.c | 14 ++++++++++++++ include/linux/blkdev.h | 1 + 2 files changed, 15 insertions(+)
diff --git a/block/blk-zoned.c b/block/blk-zoned.c
index 9d30a4115dbc..3de463a15901 100644
--- a/block/blk-zoned.c
+++ b/block/blk-zoned.c@@ -50,6 +50,20 @@ 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),
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 50e9b140cad7..2187d3778eba 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h@@ -1737,6 +1737,7 @@ extern int bdev_write_page(struct block_device *, sector_t, struct page *, #ifdef CONFIG_BLK_DEV_ZONED bool blk_req_needs_zone_write_lock(struct request *rq); +bool blk_req_zone_write_trylock(struct request *rq); void __blk_req_zone_write_lock(struct request *rq); void __blk_req_zone_write_unlock(struct request *rq);
--
2.24.1