linux-kernel - Re: [ANNOUNCE] Native Linux KVM tool v2

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Message-ID: <20110616112230.GD26110@elte.hu>
Date:	Thu, 16 Jun 2011 13:22:30 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Pekka Enberg <penberg@...nel.org>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Alexander Graf <agraf@...e.de>,
	Prasad Joshi <prasadjoshi124@...il.com>,
	Avi Kivity <avi@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sasha Levin <levinsasha928@...il.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Asias He <asias.hejun@...il.com>,
	Jens Axboe <jaxboe@...ionio.com>
Subject: Re: [ANNOUNCE] Native Linux KVM tool v2


* Christoph Hellwig <hch@...radead.org> wrote:

> On Thu, Jun 16, 2011 at 12:57:36PM +0300, Pekka Enberg wrote:
> > Uh-oh. Someone needs to apply this patch to sync_file_range():
> 
> There actually are a few cases where using it makes sense. [...]

Such as? I don't think apps can actually know whether disk blocks 
have been 'instantiated' by a particular filesystem or not, so the 
manpage:

   Some details
       None  of these operations write out the file’s metadata.  Therefore, unless the appli-
       cation is strictly performing overwrites of already-instantiated  disk  blocks,  there
       are no guarantees that the data will be available after a crash.

is rather misleading. This is a dangerous (and rather pointless) 
syscall and this should be made much clearer in the manpage.

Thanks,

	Ingo
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