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blk-mq: provide mq_ops->busy() hook 

We'll hook into this from blk_lld_busy(), allowing blk-mq to also
return whether or not a given queue currently has requests in
progress.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-10-29 10:15:10 -06:00
parent ba7b443422
commit 9ba20527f4
2 changed files with 8 additions and 0 deletions
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2
block/blk-core.c
View File

@ -3431,6 +3431,8 @@ int blk_lld_busy(struct request_queue *q)
{ {
if (q->lld_busy_fn) if (q->lld_busy_fn)
return q->lld_busy_fn(q); return q->lld_busy_fn(q);
if (q->mq_ops && q->mq_ops->busy)
return q->mq_ops->busy(q);
return 0; return 0;
} }

6
include/linux/blk-mq.h
View File

@ -114,6 +114,7 @@ typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
typedef void (busy_tag_iter_fn)(struct request *, void *, bool); typedef void (busy_tag_iter_fn)(struct request *, void *, bool);
typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int); typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
typedef int (map_queues_fn)(struct blk_mq_tag_set *set); typedef int (map_queues_fn)(struct blk_mq_tag_set *set);
typedef bool (busy_fn)(struct request_queue *);
struct blk_mq_ops { struct blk_mq_ops {
@ -165,6 +166,11 @@ struct blk_mq_ops {
/* Called from inside blk_get_request() */ /* Called from inside blk_get_request() */
void (*initialize_rq_fn)(struct request *rq); void (*initialize_rq_fn)(struct request *rq);
/*
* If set, returns whether or not this queue currently is busy
*/
busy_fn *busy;
map_queues_fn *map_queues; map_queues_fn *map_queues;
#ifdef CONFIG_BLK_DEBUG_FS #ifdef CONFIG_BLK_DEBUG_FS