Commit 9c72a18e authored Aug 24, 2017 by Song Liu Committed by Shaohua Li Aug 24, 2017

md/raid5: release/flush io in raid5_do_work()



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+

Cc: stable@vger.kernel.org (4.4+)
Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Shaohua Li <shli@fb.com>

parent 8031c3dd

drivers/md/raid5.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -6235,6 +6235,10 @@ static void raid5_do_work(struct work_struct *work)

		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);

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