[PATCH 4.13 52/52] md/raid5: release/flush io in raid5_do_work()

From: Greg Kroah-Hartman
Date: Mon Sep 18 2017 - 05:12:26 EST

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


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:


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 | 4 ++++
1 file changed, 4 insertions(+)

--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -6235,6 +6235,10 @@ static void raid5_do_work(struct work_st


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