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    SubjectRe: Overlay writable filesystem over r/o partition [long]
    On Tue, 6 Jan 1998, Theodore Y. Ts'o wrote:
    ...
    > About the only ugly part of BSD's unionfs is that it requires libc
    > support to avoid duplicate names from readdir(). The problem with doing
    > this in the kernel is that it's really hard to have the kernel throw out
    > duplicate names. (You can do it, but it would require lots of memory
    > allocations, which you'd really rather not do in the kernel.)

    That's the issue I found depressing last time I looked at doing unionfs (a
    natural extension/replacement of the loopback filesystem)... So consider
    the challenge accepted. ;-) I need to brush up on the new dentry code
    anyways.

    -ben



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