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Date: Tue, 12 Jan 2010 17:43:21 +0100 From: Michal Novotny <minovotn@...hat.com> To: Christoph Hellwig <hch@...radead.org> CC: 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 01/12/2010 05:38 PM, Christoph Hellwig wrote: > Ok, I looked at the issue. The problem is that the Xen backend drivers > are (as expected) utterly braindead and submit bios directly from the > virtualization backed without using proper abstractions and thus > bypassing all the cache coherency features in the fileystems (the block > device nodes are just another mini-filesystem in that respect). So > when you first have buffered access in the host pages may stay in cache > and get overwritten directly on disk by a Xen guest, and once the guest > is down the host may still use the now stale cached data. > > I would recommend to migrate your cutomers to KVM which uses the proper > abtractions and thus doesn't have this problem. There's a reason after > all why all the Xen dom0 mess never got merged to mainline. > 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? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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