linux-kernel - Re: Linux 2.6.29

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Message-ID: <20090326024753.GA27299@srcf.ucam.org>
Date:	Thu, 26 Mar 2009 02:47:53 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Kyle Moffett <kyle@...fetthome.net>
Cc:	Theodore Tso <tytso@....edu>,
	Christoph Hellwig <hch@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

On Wed, Mar 25, 2009 at 10:44:44PM -0400, Kyle Moffett wrote:

>    Perhaps we ought to add a couple extra open flags, O_BARRIER_BEFORE and
>    O_BARRIER_AFTER, and rename3(), etc functions that take flags arguments?
>    Or maybe a new set of syscalls like barrier(file1, file2) and
>    fbarrier(fd1, fd2), which cause all pending changes (perhaps limit to this
>    process?) to the file at fd1 to occur before any successive changes (again
>    limited to this process?) to the file at fd2.

That's an option, but what would benefit? If rename is expected to 
preserve ordering (which I think it has to, in order to avoid breaking 
existing code) then are there any other interesting use cases?

-- 
Matthew Garrett | mjg59@...f.ucam.org
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