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block: simplify blk_mq_plug 

Drop the unused q argument, and invert the check to move the exception
into a branch and the regular path as the normal return.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Link: https://lore.kernel.org/r/20220706070350.1703384-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2022-07-06 09:03:38 +02:00 committed by Jens Axboe
parent edd1dbc83b
commit 6deacb3bfa
4 changed files with 11 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
block/blk-core.c
View File

@ -719,7 +719,7 @@ void submit_bio_noacct(struct bio *bio)
might_sleep();
plug = blk_mq_plug(q, bio);
plug = blk_mq_plug(bio);
if (plug && plug->nowait)
bio->bi_opf |= REQ_NOWAIT;

2
block/blk-merge.c
View File

@ -1051,7 +1051,7 @@ bool blk_attempt_plug_merge(struct request_queue *q, struct bio *bio,
struct blk_plug *plug;
struct request *rq;
plug = blk_mq_plug(q, bio);
plug = blk_mq_plug(bio);
if (!plug || rq_list_empty(plug->mq_list))
return false;

2
block/blk-mq.c
View File

@ -2808,7 +2808,7 @@ static void bio_set_ioprio(struct bio *bio)
void blk_mq_submit_bio(struct bio *bio)
{
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
struct blk_plug *plug = blk_mq_plug(q, bio);
struct blk_plug *plug = blk_mq_plug(bio);
const int is_sync = op_is_sync(bio->bi_opf);
struct request *rq;
unsigned int nr_segs = 1;

18
block/blk-mq.h
View File

@ -294,7 +294,6 @@ static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap)
/*
* blk_mq_plug() - Get caller context plug
* @q: request queue
* @bio : the bio being submitted by the caller context
*
* Plugging, by design, may delay the insertion of BIOs into the elevator in
@ -305,23 +304,22 @@ static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap)
* order. While this is not a problem with regular block devices, this ordering
* change can cause write BIO failures with zoned block devices as these
* require sequential write patterns to zones. Prevent this from happening by
* ignoring the plug state of a BIO issuing context if the target request queue
* is for a zoned block device and the BIO to plug is a write operation.
* ignoring the plug state of a BIO issuing context if it is for a zoned block
* device and the BIO to plug is a write operation.
*
* Return current->plug if the bio can be plugged and NULL otherwise
*/
static inline struct blk_plug *blk_mq_plug(struct request_queue *q,
struct bio *bio)
static inline struct blk_plug *blk_mq_plug( struct bio *bio)
{
/* Zoned block device write operation case: do not plug the BIO */
if (bdev_is_zoned(bio->bi_bdev) && op_is_write(bio_op(bio)))
return NULL;
/*
* For regular block devices or read operations, use the context plug
* which may be NULL if blk_start_plug() was not executed.
*/
if (!bdev_is_zoned(bio->bi_bdev) || !op_is_write(bio_op(bio)))
return current->plug;
/* Zoned block device write operation case: do not plug the BIO */
return NULL;
return current->plug;
}
/* Free all requests on the list */