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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