linux-kernel - Re: [PATCH v2] notify block layer when using temporary change to cache

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Message-ID: <20140611120713.GB16616@infradead.org>
Date:	Wed, 11 Jun 2014 05:07:13 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Vaughan Cao <vaughan.cao@...cle.com>
Cc:	JBottomley@...allels.com, hch@...radead.org,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] notify block layer when using temporary change to
 cache_type

On Tue, Jun 03, 2014 at 05:37:30PM +0800, Vaughan Cao wrote:
> 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 temporary change the cache_type to write through.
> If not, 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@...cle.com>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>

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