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ANDROID: block: Document blk_queue_zone_is_seq() and blk_rq_zone_is_seq()

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Since it is nontrivial to figure out how disk_zone_is_seq() and
blk_rq_zone_is_seq() handle sequential write preferred zones, document
this.

Bug: 264714656
Change-Id: I6d58683c302c29dc3134dcaf422b3e5c092092c1
Signed-off-by: Bart Van Assche <bvanassche@google.com>
This commit is contained in:
Bart Van Assche
2023-01-06 17:02:39 -08:00
parent 54f530babe
commit 6509785eda
1 changed files with 16 additions and 0 deletions
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16
include/linux/blkdev.h
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@@ -723,6 +723,15 @@ static inline unsigned int blk_queue_zone_no(struct request_queue *q,
return sector >> ilog2(q->limits.chunk_sectors);
}
/**
* blk_queue_zone_is_seq() - Whether a logical block is in a sequential zone.
* @q: Request queue pointer.
* @sector: Offset from start of block device in 512 byte units.
*
* Return: true if and only if @q refers to a zoned block device and
* @sector refers either to a sequential write required or a sequential
* write preferred zone.
*/
static inline bool blk_queue_zone_is_seq(struct request_queue *q,
sector_t sector)
{
@@ -1000,6 +1009,13 @@ static inline unsigned int blk_rq_zone_no(struct request *rq)
return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
}
/**
* blk_rq_zone_is_seq() - Whether a request is for a sequential zone.
* @rq: Request pointer.
*
* Return: true if and only if blk_rq_pos(@rq) refers either to a sequential
* write required or a sequential write preferred zone.
*/
static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
{
return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));