linux-kernel - Re: Atomic non-durable file write API

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Message-ID: <AANLkTikYF-V2WaEB3a04OhFuzOm2qjx3fWxJ6fOwED5T@mail.gmail.com>
Date:	Mon, 6 Dec 2010 17:45:23 +0100
From:	Olaf van der Spek <olafvdspek@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: Atomic non-durable file write API

On Mon, Nov 29, 2010 at 1:37 PM, Olaf van der Spek <olafvdspek@...il.com> wrote:
> Hi,
>
> Since the introduction of ext4, some apps/users have had issues with
> file corruption after a system crash. It's not a bug in the FS AFAIK
> and it's not exclusive to ext4.
> Writing a temp file, fsync, rename is often proposed. However, the
> durable aspect of fsync isn't always required and this way has other
> issues.
> What is the recommended way for atomic non-durable (complete) file writes?
>
> I'm also wondering why FSs commit after open/truncate but before
> write/close. AFAIK this isn't necessary and thus suboptimal.

Somebody?
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