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    SubjectRe: [PATCH 0/5] hybrid union filesystem prototype

    On Thursday 2010-09-02 15:32, Neil Brown wrote:
    >>
    >> Oh and I what I like to see is support for multiple readonly branches :)
    >
    >I think we very nearly have that, assuming I understand your requirement
    >correctly.
    >The lower filesystem can itself be an overlay, providing it is mounted
    >read-only.
    >
    >So if /mnt/ro1 /mnt/ro2 /mnt/ro3 are all read-only branches then
    >
    > mount -o ro,lowerdir=/mnt/ro1,upperdir=/mnt/ro2 meaninglessstring /mnt/ov1
    > mount -o ro,lowerdir=/mnt/ov1,upperdir=/mnt/ro3 meaninglessstring /mnt/ov2
    > mount -o lowerdir=/mnt/ov2,upperdir=/mnt/rw ignoreme /mnt/overlay
    >
    >and /mnt/overlay will be the combination of 3 read-only filesystems and one
    >writable one.
    >(this doesn't work with the code as-is, but it is really just a few bug-fixes
    >away).

    There ought to be a reason that other implementations offer
    doing multiple branches with a single vfsmount.


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