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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);
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