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    SubjectRe: [PATCH] overlayfs: ignore empty NFSv4 ACLs in ext4 upperdir
    On Thu, May 02, 2019 at 05:08:14PM +0200, Andreas Grünbacher wrote:
    > You'll still see permissions that differ from what the filesystem
    > enforces, and copy-up would change that behavior.

    That's always true, and this issue isn't really specific to NFSv4 ACLs
    (or ACLs at all), it already exists with just mode bits. The client
    doesn't know how principals may be mapped on the server, doesn't know
    group membership, etc.

    That's the usual model, anyway. Permissions are almost entirely the
    server's responsibility, and we just provide a few attributes to set/get
    those server-side permissions.

    The overlayfs/NFS case is different, I think: the nfs filesystem may be
    just a static read-only template for a filesystem that's only ever used
    by clients, and for all I know maybe permissions should only be
    interpreted on the client side in that case.

    --b.

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