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block: introduce blk_req_zone_write_trylock

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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>
This commit is contained in:
Johannes Thumshirn
2020-05-12 17:55:48 +09:00
committed by Jens Axboe
parent 0512a75b98
commit 1392d37018
2 changed files with 15 additions and 0 deletions
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14
block/blk-zoned.c
View File

@@ -82,6 +82,20 @@ bool blk_req_needs_zone_write_lock(struct request *rq)
} }
EXPORT_SYMBOL_GPL(blk_req_needs_zone_write_lock); 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) void __blk_req_zone_write_lock(struct request *rq)
{ {
if (WARN_ON_ONCE(test_and_set_bit(blk_rq_zone_no(rq), if (WARN_ON_ONCE(test_and_set_bit(blk_rq_zone_no(rq),

1
include/linux/blkdev.h
View File

@@ -1738,6 +1738,7 @@ extern int bdev_write_page(struct block_device *, sector_t, struct page *,
#ifdef CONFIG_BLK_DEV_ZONED #ifdef CONFIG_BLK_DEV_ZONED
bool blk_req_needs_zone_write_lock(struct request *rq); 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_lock(struct request *rq);
void __blk_req_zone_write_unlock(struct request *rq); void __blk_req_zone_write_unlock(struct request *rq);