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

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
......@@ -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);
}
......
......@@ -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;
......
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