linux-kernel - Re: [RFC 12/26] ext2 white-out support

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Message-ID: <20070731083223.GE5469@schatzie.adilger.int>
Date:	Tue, 31 Jul 2007 03:32:23 -0500
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Jan Blunck <jblunck@...e.de>
Cc:	Theodore Tso <tytso@....edu>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bharata B Rao <bharata@...ux.vnet.ibm.com>
Subject: Re: [RFC 12/26] ext2 white-out support

On Jul 31, 2007  09:44 +0200, Jan Blunck wrote:
> Ok, this is pretty similar to the way I implemented this for tmpfs. The
> problem is that the union mount code is explicitly checking if the filesystem
> is supporting whiteout. I used to use a new filesystem flag (FS_WHITEOUT) for
> this but thought that disk filesystem like ext2/3/4 will have problem with
> that if you mount an old image. So I guess I still need a feature flag.

You also need whiteout support for extents.  This could be done with
unwritten extents potentially, or as I previously proposed (RFC) in
linux-ext4.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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