From: Vaughan Cao <vaughan.cao@oracle.com>
Date: Tue, 3 Jun 2014 09:37:30 +0000 (+0800)
Subject: sd: notify block layer when using temporary change to cache_type
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~143^2~129
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cb2fb68d064c16a559483651132815cc378fd1f9;p=pandora-kernel.git

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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