This is a note to let you know that I've just added the patch titled
md/raid5: release/flush io in raid5_do_work()
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
md-raid5-release-flush-io-in-raid5_do_work.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 9c72a18e46ebe0f09484cce8ebf847abdab58498 Mon Sep 17 00:00:00 2001
From: Song Liu <songliubraving@xxxxxx>
Date: Thu, 24 Aug 2017 09:53:59 -0700
Subject: md/raid5: release/flush io in raid5_do_work()
From: Song Liu <songliubraving@xxxxxx>
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@xxxxxx>
Signed-off-by: Shaohua Li <shli@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/raid5.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5844,6 +5844,8 @@ static void raid5_do_work(struct work_st
spin_unlock_irq(&conf->device_lock);
+ r5l_flush_stripe_to_raid(conf->log);
+
async_tx_issue_pending_all();
blk_finish_plug(&plug);
Patches currently in stable-queue which might be from songliubraving@xxxxxx are
queue-4.9/md-raid5-release-flush-io-in-raid5_do_work.patch