linux-kernel - Re: [PATCH] extend e2fsprogs functionality to add EXT2_FLAG

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Message-ID: <20100112164748.GA26895@infradead.org>
Date:	Tue, 12 Jan 2010 11:47:48 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Michal Novotny <minovotn@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Ric Wheeler <rwheeler@...hat.com>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] extend e2fsprogs functionality to add EXT2_FLAG_DIRECT
	option

On Tue, Jan 12, 2010 at 05:43:21PM +0100, Michal Novotny wrote:
> So, do you think the problem is in the Xen backend drivers and to make  
> it working right in Xen the driver fix is needed?

Yes, the Xen blkback driver just submits I/O directly without using
the right interfaces to force cache coherency.  It might be relatively
easy to hack a call in to flush all caches when it starts up, but given
how it bypasses all abstractions it's almost impossible to give full
coherency as if using the normal block device interfaces.

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