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-rw-r--r--block/blk-mq.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 0fbef7e9bef1..7b71ab1b1536 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1789,6 +1789,28 @@ void blk_mq_free_tag_set(struct blk_mq_tag_set *set)
}
EXPORT_SYMBOL(blk_mq_free_tag_set);
+int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr)
+{
+ struct blk_mq_tag_set *set = q->tag_set;
+ struct blk_mq_hw_ctx *hctx;
+ int i, ret;
+
+ if (!set || nr > set->queue_depth)
+ return -EINVAL;
+
+ ret = 0;
+ queue_for_each_hw_ctx(q, hctx, i) {
+ ret = blk_mq_tag_update_depth(hctx->tags, nr);
+ if (ret)
+ break;
+ }
+
+ if (!ret)
+ q->nr_requests = nr;
+
+ return ret;
+}
+
void blk_mq_disable_hotplug(void)
{
mutex_lock(&all_q_mutex);