md/raid5: release/flush io in raid5_do_work()
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@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 383f19c..549b4af 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5844,6 +5844,8 @@
spin_unlock_irq(&conf->device_lock);
+ r5l_flush_stripe_to_raid(conf->log);
+
async_tx_issue_pending_all();
blk_finish_plug(&plug);