linux-ext4 - Re: Atomic non-durable file write API

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Message-ID: <20101229110536.GA15179@dastard>
Date:	Wed, 29 Dec 2010 22:05:36 +1100
From:	Dave Chinner <david@...morbit.com>
To:	Greg Freemyer <greg.freemyer@...il.com>
Cc:	Neil Brown <neilb@...e.de>,
	Olaf van der Spek <olafvdspek@...il.com>,
	Christian Stroetmann <stroetmann@...olinux.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-ext4@...r.kernel.org, Ted Ts'o <tytso@....edu>,
	Nick Piggin <npiggin@...il.com>
Subject: Re: Atomic non-durable file write API

On Tue, Dec 28, 2010 at 05:00:55PM -0500, Greg Freemyer wrote:
> If I am working on a office doc with oowriter as an example, I don't
> want a system crash or out of diskspace to kill my original doc.  7 or
> 8 years ago XFS used to zero out the file in situations like that.

FUD. XFS has _never_ zeroed files during recovery. This gets repeated
often enough that we've even got a FAQ entry for it:

http://xfs.org/index.php/XFS_FAQ#Q:_Why_do_I_see_binary_NULLS_in_some_files_after_recovery_when_I_unplugged_the_power.3F

> Hopefully that's fixed.

4 years ago...

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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