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    SubjectRe: [RFC PATCH 1/2] Union Mount: glibc readdir support
    On Tue, May 06, 2008 at 10:40:28PM +0930, David Newall wrote:
    > Bharata B Rao wrote:
    > > Is dis-allowing NFS-exporting of unions an option ?
    > Is it that simple? What about a union further in an NFS export? What
    > about union-mounting after the tree has been NFS-exported?

    Ok I am realizing that it is not simple. I am actually reading up NFS
    code to understand how it supports crossing of mountpoints. I see that
    one can mount a filesystem within a NFS export and NFS server would be
    able to cross over to that filesystem and provide those contents to the
    client. Acutally Union Mount maintains union stack very similar to the
    mount stack, but here we walk the union stack down. So I am checking if
    something similar to mountpoint crossing would be able to solve the
    problem of fetching all the contents of the NFS-exported union.

    Answering my question to Erez that I raised in another thread, I see
    that Unionfs doesn't set the export_operations in it's superblock and
    hence I believe unions created by Unionfs aren't NFS-exportable as of
    know. Erez, correct me if I got it wrong.


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