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    SubjectRe: [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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