Commit 1392d370 authored by Johannes Thumshirn's avatar Johannes Thumshirn Committed by Jens Axboe
Browse files

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: default avatarJohannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Reviewed-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 0512a75b

block/blk-zoned.c

+14 −0
Original line number Diff line number Diff line
@@ -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),

include/linux/blkdev.h

+1 −0
Original line number Diff line number Diff line
@@ -1738,6 +1738,7 @@ 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);

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