From 69e07c4adb8669fd77f3b59abdb436aca9f1bee9 Mon Sep 17 00:00:00 2001
From: Ming Lei <ming.lei@redhat.com>
Date: Tue, 6 Jun 2017 23:22:07 +0800
Subject: [PATCH] blk-mq: update comments on blk_mq_quiesce_queue()
Git-commit: 69e07c4adb8669fd77f3b59abdb436aca9f1bee9
Patch-mainline: v4.13-rc1
References: fate#322738,fate#322919,fate#322950,fate#323773
Actually what we want to get from blk_mq_quiesce_queue()
isn't only to wait for completion of all ongoing .queue_rq().
In the typical context of canceling requests, we need to
make sure that the following is done in the dispatch path
before starting to cancel requests:
- failed dispatched request is finished
- busy dispatched request is requeued, and the STARTED
flag is cleared
So update comment to keep code, doc and our expection consistent.
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Coly Li <colyli@suse.de>
---
block/blk-mq.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 40b22c7f684e..f2a73190f60d 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -155,12 +155,13 @@ void blk_mq_unfreeze_queue(struct request_queue *q)
EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue);
/**
- * blk_mq_quiesce_queue() - wait until all ongoing queue_rq calls have finished
+ * blk_mq_quiesce_queue() - wait until all ongoing dispatches have finished
* @q: request queue.
*
* Note: this function does not prevent that the struct request end_io()
- * callback function is invoked. Additionally, it is not prevented that
- * new queue_rq() calls occur unless the queue has been stopped first.
+ * callback function is invoked. Once this function is returned, we make
+ * sure no dispatch can happen until the queue is unquiesced via
+ * blk_mq_unquiesce_queue().
*/
void blk_mq_quiesce_queue(struct request_queue *q)
{
--
2.13.1