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    SubjectRe: [RFC 11/26] tmpfs white-out support
    On Mon, 30 Jul 2007, Jan Blunck wrote:

    > Introduce white-out support to tmpfs.
    >
    > Signed-off-by: Jan Blunck <jblunck@suse.de>
    > ---
    > include/linux/shmem_fs.h | 1
    > mm/shmem.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++
    > 2 files changed, 55 insertions(+)

    I see there's debate about whether this (and its fellows) give the
    right semantic to whiteouts; and I've not begun to think about that.

    But as a patch to tmpfs for what you're trying to do, it looks just
    about fine. I say "just about" because the reference counting looks
    right, but I wouldn't dare say that it _is_ right without testing.

    And I'd probably want to add a minor adjustment, so that a mount with
    nr_inodes=1000 could still support exactly 1000 inodes, despite your
    allocating one for the whiteout (usually never used) at mount time.
    But that can follow along later, no problem.

    Hugh
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