From cb2fb68d064c16a559483651132815cc378fd1f9 Mon Sep 17 00:00:00 2001
From: Vaughan Cao <vaughan.cao@oracle.com>
Date: Tue, 3 Jun 2014 17:37:30 +0800
Subject: [PATCH] sd: notify block layer when using temporary change to
 cache_type

This is a fix for commit 39c60a0948cc06139e2fbfe084f83cb7e7deae3b

  "sd: fix array cache flushing bug causing performance problems"

We must notify the block layer via q->flush_flags after a temporary change
of the cache_type to write through.  Without this, a SYNCHRONIZE CACHE
command will still be generated.  This patch factors out a helper that
can be called from sd_revalidate_disk and cache_type_store.

Signed-off-by: Vaughan Cao <vaughan.cao@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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