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Date: Thu, 26 Mar 2009 02:47:53 +0000
From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Kyle Moffett <kyle@moffetthome.net>
Cc: Theodore Tso <tytso@mit.edu>, Christoph Hellwig <hch@infradead.org>,
       Linus Torvalds <torvalds@linux-foundation.org>, Jan Kara <jack@suse.cz>,
       Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
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Subject: Re: Linux 2.6.29
Message-ID: <20090326024753.GA27299@srcf.ucam.org>
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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@srcf.ucam.org
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