NFSv4: Add a generic structure for managing layout-private information

	struct nfs_fsinfo	       *lr_fsinfo;

};

struct xdr_stream;

struct nfs4_xdr_opaque_data;

struct nfs4_xdr_opaque_ops {

	void (*encode)(struct xdr_stream *, const void *args,

			const struct nfs4_xdr_opaque_data *);

	void (*free)(struct nfs4_xdr_opaque_data *);

};

struct nfs4_xdr_opaque_data {

	const struct nfs4_xdr_opaque_ops *ops;

	void *data;

};

#define PNFS_LAYOUT_MAXSIZE 4096

struct nfs4_layoutdriver_data {