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    SubjectRe: [RFC] VFS: FS CoW using redirection
    On Sun, 9 July 2006 15:50:36 +0300, Al Boldi wrote:
    > Consider something simple like this:
    > VFS - anyFS1 (r/w) used normally, unless ENotFound, then redirect read to
    > \ anyFS2, or CoW from anyFS2 to anyFS1.
    > anyFS2 (r/o) used normally.

    That concept is known as union mount. Jan Blunck did some patches in
    that direction, you might be able to find them in the archives. If
    not, just send him a mail.


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