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authorMing Lei <ming.lei@redhat.com>2017-06-06 23:22:03 +0800
committerJens Axboe <axboe@kernel.dk>2017-06-18 14:20:04 -0600
commite4e739131ac93d373cd2d2fd92820a6a39115ba5 (patch)
tree7569770cf51a79c6b55390958f7bef3182287863 /block
parent4f084b41a0c04a69067be98a210e6b50969f9945 (diff)
downloadlinux-e4e739131ac93d373cd2d2fd92820a6a39115ba5.tar.bz2
blk-mq: introduce blk_mq_unquiesce_queue
blk_mq_start_stopped_hw_queues() is used implictly as counterpart of blk_mq_quiesce_queue() for unquiescing queue, so we introduce blk_mq_unquiesce_queue() and make it as counterpart of blk_mq_quiesce_queue() explicitly. This function is for improving the current quiescing mechanism in the following patches. Reviewed-by: Bart Van Assche <Bart.VanAssche@sandisk.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index cc85de9d6b2d..07785b5cf2bc 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -181,6 +181,19 @@ void blk_mq_quiesce_queue(struct request_queue *q)
}
EXPORT_SYMBOL_GPL(blk_mq_quiesce_queue);
+/*
+ * blk_mq_unquiesce_queue() - counterpart of blk_mq_quiesce_queue()
+ * @q: request queue.
+ *
+ * This function recovers queue into the state before quiescing
+ * which is done by blk_mq_quiesce_queue.
+ */
+void blk_mq_unquiesce_queue(struct request_queue *q)
+{
+ blk_mq_start_stopped_hw_queues(q, true);
+}
+EXPORT_SYMBOL_GPL(blk_mq_unquiesce_queue);
+
void blk_mq_wake_waiters(struct request_queue *q)
{
struct blk_mq_hw_ctx *hctx;