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A future patch will enable NFSD to sign filehandles by appending a Message Authentication Code(MAC). To do this, NFSD requires a secret 128-bit key that can persist across reboots. A persisted key allows the server to accept filehandles after a restart. Enable NFSD to be configured with this key via the netlink interface. Link: https://lore.kernel.org/linux-nfs/cover.1772022373.git.bcodding@hammerspace.com Signed-off-by: Benjamin Coddington <bcodding@hammerspace.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com>