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blk-mq: add shallow depth option for blk_mq_get_tag()

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Wire up the sbitmap_get_shallow() operation to the tag code so that a
caller can limit the number of tags available to it.

Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Omar Sandoval 2017-04-14 00:59:59 -07:00 committed by Jens Axboe
parent c05e667337
commit 229a92873f
2 changed files with 5 additions and 1 deletions
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5
block/blk-mq-tag.c
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@ -96,7 +96,10 @@ static int __blk_mq_get_tag(struct blk_mq_alloc_data *data,
if (!(data->flags & BLK_MQ_REQ_INTERNAL) &&
!hctx_may_queue(data->hctx, bt))
return -1;
return __sbitmap_queue_get(bt);
if (data->shallow_depth)
return __sbitmap_queue_get_shallow(bt, data->shallow_depth);
else
return __sbitmap_queue_get(bt);
}
unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data)

1
block/blk-mq.h
View File

@ -141,6 +141,7 @@ struct blk_mq_alloc_data {
/* input parameter */
struct request_queue *q;
unsigned int flags;
unsigned int shallow_depth;
/* input & output parameter */
struct blk_mq_ctx *ctx;