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    SubjectRe: Transparent mounts
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    Chad Miller <cmiller@surfsouth.com> writes:

    > On Wed, Nov 17, 1999 at 09:26:41PM +0000, Riley Williams wrote:
    > > Basically, one facility I could use is that of being able to mount two
    > > or more partitions on top of each other and have all the files from
    > > all of the partitions available for reading. This is what I call a
    > > transparent mount.
    >
    > It sounds a lot like (BSD's?) union mount.

    It is also similar to the experimental BSD vpath. There is a paper somewhere on
    this. Vpaths were stored in the kernel per-user as a stack. They then worked
    rather like the makefile VPATH directive, indeed this is probably what inspired
    it.

    A per-user vpath affected namei lookups. Apparently the kernel mods required
    were small.

    --
    Andrew Hilborne

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