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Date: Mon, 30 Jul 2001 13:27:57 -0300 (BRST)
From: Rik van Riel <riel@conectiva.com.br>
X-X-Sender: <riel@imladris.rielhome.conectiva>
To: "Patrick J. LoPresti" <patl@curl.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, Chris Mason <mason@suse.com>,
        Chris Wedgwood <cw@f00f.org>, <linux-kernel@vger.kernel.org>
Subject: Re: ext3-2.4-0.9.4
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Message-ID: <Pine.LNX.4.33L.0107301326150.11893-100000@imladris.rielhome.conectiva>
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On 30 Jul 2001, Patrick J. LoPresti wrote:

>   The relevant standards (POSIX, SuS, etc.) provide no way to perform
>   reliable transactions on a file system.
>
>   BSD provides one solution, which is synchronous metatdata.  (I am
>   assuming modern BSDs already deal with the multiple-disk-block
>   problem to make these transactions properly atomic.  Is this
>   assumption false?)
>
>   Linux provides a different solution, which is fsync() on the
>   directory.
>
>   All MTAs, and other apps besides, currently use the BSD solution for
>   reliable transactions.
>
> Is it really so absurd to ask Linux to provide efficient support of
> the BSD semantics as an option?

Yes. You could fix this issue in userland very easily,
it might even work with an LD_PRELOAD ...

Besides BSD softupdates and the various journaling
filesystems which are in use on other Unixen also
don't provide the 4.3BSD solution any more ...

regards,

Rik
--
Virtual memory is like a game you can't win;
However, without VM there's truly nothing to lose...

http://www.surriel.com/		http://distro.conectiva.com/

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