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From: Christoph Hellwig <hch@infradead.org>
To: Martin Steigerwald <Martin@lichtvoll.de>
Cc: xfs@oss.sgi.com
Subject: Re: safe writing in applications (was: Re: massively truncated files with XFS with sudden power loss on 2.6.27 and 2.6.28)
Date: Mon, 29 Dec 2008 14:54:06 -0500	[thread overview]
Message-ID: <20081229195406.GA7613@infradead.org> (raw)
In-Reply-To: <200812292048.41193.Martin@lichtvoll.de>

On Mon, Dec 29, 2008 at 08:48:40PM +0100, Martin Steigerwald wrote:
> It might be wise however to file enhancement requests for the KDE 
> applications where I observed this behavior if safer writing within the 
> applications is possible. Any hints on what application developers should 
> keep in mind when writing out config files?

Preferably use O_SYNC.  Never truncate and then rewrite, in doubt write
a new file and rename it to the right place after it was fsync'ed (the
mailserver trick)

in the meantime a nice way to hack around this is do chattr +S for all
these files which forces synchronous writes.  Doesn't help if they
actually use the rename trick above sometimes.

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      reply	other threads:[~2008-12-29 19:54 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-12-29 18:20 massively truncated files with XFS with sudden power loss on 2.6.27 and 2.6.28 Martin Steigerwald
2008-12-29 19:03 ` Chris Wedgwood
2008-12-29 19:08 ` Eric Sandeen
2008-12-29 20:00   ` Martin Steigerwald
2008-12-30  0:14   ` Chris Wedgwood
2008-12-29 19:09 ` Russell Cattelan
2008-12-29 19:20   ` Christoph Hellwig
2008-12-29 19:29   ` Chris Wedgwood
2008-12-29 20:09     ` Russell Cattelan
2008-12-29 20:17       ` Chris Wedgwood
2008-12-29 21:25         ` Russell Cattelan
2008-12-29 21:56       ` Eric Sandeen
2008-12-29 19:48 ` safe writing in applications (was: Re: massively truncated files with XFS with sudden power loss on 2.6.27 and 2.6.28) Martin Steigerwald
2008-12-29 19:54   ` Christoph Hellwig [this message]

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