From: Michal Novotny <minovotn@redhat.com>
To: Christoph Hellwig <hch@infradead.org>
Cc: Ric Wheeler <rwheeler@redhat.com>,
linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] extend e2fsprogs functionality to add EXT2_FLAG_DIRECT option
Date: Tue, 12 Jan 2010 17:51:18 +0100 [thread overview]
Message-ID: <4B4CA886.8070808@redhat.com> (raw)
In-Reply-To: <20100112164748.GA26895@infradead.org>
On 01/12/2010 05:47 PM, Christoph Hellwig wrote:
> 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.
>
>
Ok, this way the fix to the drivers should be done. Thanks for your
investigation. I just forwarded your reply to other members of my team.
Thanks,
Michal
next prev parent reply other threads:[~2010-01-12 16:51 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-08 9:36 [PATCH] extend e2fsprogs functionality to add EXT2_FLAG_DIRECT option Michal Novotny
2010-01-11 20:06 ` Ric Wheeler
2010-01-12 10:54 ` Michal Novotny
2010-01-12 11:59 ` Ric Wheeler
2010-01-12 12:15 ` Michal Novotny
2010-01-12 12:23 ` Christoph Hellwig
2010-01-12 12:30 ` Michal Novotny
2010-01-12 12:46 ` Christoph Hellwig
2010-01-12 13:01 ` Michal Novotny
2010-01-12 13:04 ` Ric Wheeler
2010-01-12 13:12 ` Michal Novotny
2010-01-12 13:23 ` Michal Novotny
2010-01-12 13:29 ` Ric Wheeler
2010-01-12 13:33 ` Michal Novotny
2010-01-12 14:33 ` Chris Lee
2010-01-12 14:37 ` Michal Novotny
2010-01-12 16:38 ` Christoph Hellwig
2010-01-12 16:43 ` Michal Novotny
2010-01-12 16:47 ` Christoph Hellwig
2010-01-12 16:51 ` Michal Novotny [this message]
2010-01-12 16:50 ` Ric Wheeler
2010-01-12 16:53 ` Michal Novotny
2010-01-12 16:56 ` Eric Sandeen
2010-01-12 16:59 ` Ric Wheeler
2010-01-12 17:00 ` Michal Novotny
2010-01-14 13:46 ` Michal Novotny
2010-01-12 12:47 ` Andreas Dilger
2010-01-12 13:04 ` Michal Novotny
2010-01-12 15:16 ` Eric Sandeen
2010-01-12 15:46 ` Michal Novotny
2010-01-12 20:01 ` Ric Wheeler
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