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Commit 229a9287 authored by Omar Sandoval's avatar Omar Sandoval Committed by Jens Axboe
Browse files

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



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: default avatarOmar Sandoval <osandov@fb.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent c05e6673

block/blk-mq-tag.c

+4 −1
Original line number Diff line number Diff line
@@ -96,6 +96,9 @@ 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;

	if (data->shallow_depth)

		return __sbitmap_queue_get_shallow(bt, data->shallow_depth);

	else

		return __sbitmap_queue_get(bt);

}

block/blk-mq.h

+1 −0
Original line number Diff line number Diff line
@@ -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;