linux-kernel - [PATCH 4.12 52/52] md/raid5: release/flush io in raid5_do

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Date:   Mon, 18 Sep 2017 11:11:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Song Liu <songliubraving@...com>,
        Shaohua Li <shli@...com>
Subject: [PATCH 4.12 52/52] md/raid5: release/flush io in raid5_do_work()

4.12-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Song Liu <songliubraving@...com>

commit 9c72a18e46ebe0f09484cce8ebf847abdab58498 upstream.

In raid5, there are scenarios where some ios are deferred to a later
time, and some IO need a flush to complete. To make sure we make
progress with these IOs, we need to call the following functions:

    flush_deferred_bios(conf);
    r5l_flush_stripe_to_raid(conf->log);

Both of these functions are called in raid5d(), but missing in
raid5_do_work(). As a result, these functions are not called
when multi-threading (group_thread_cnt > 0) is enabled. This patch
adds calls to these function to raid5_do_work().

Note for stable branches:

  r5l_flush_stripe_to_raid(conf->log) is need for 4.4+
  flush_deferred_bios(conf) is only needed for 4.11+

Signed-off-by: Song Liu <songliubraving@...com>
Signed-off-by: Shaohua Li <shli@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/md/raid5.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6238,6 +6238,10 @@ static void raid5_do_work(struct work_st

 	spin_unlock_irq(&conf->device_lock);

+	flush_deferred_bios(conf);
+
+	r5l_flush_stripe_to_raid(conf->log);
+
 	async_tx_issue_pending_all();
 	blk_finish_plug(&plug);