nfs4xdr.c

static void encode_test_stateid(struct xdr_stream *xdr,
				struct nfs41_test_stateid_args *args,
				struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_TEST_STATEID, decode_test_stateid_maxsz, hdr);
	encode_uint32(xdr, 1);
	encode_nfs4_stateid(xdr, args->stateid);
}

static void encode_free_stateid(struct xdr_stream *xdr,
				struct nfs41_free_stateid_args *args,
				struct compound_hdr *hdr)
{
	encode_op_hdr(xdr, OP_FREE_STATEID, decode_free_stateid_maxsz, hdr);
	encode_nfs4_stateid(xdr, args->stateid);
}
#endif /* CONFIG_NFS_V4_1 */

/*
 * END OF "GENERIC" ENCODE ROUTINES.
 */

static u32 nfs4_xdr_minorversion(const struct nfs4_sequence_args *args)
{
#if defined(CONFIG_NFS_V4_1)

	if (args->sa_slot)
		return args->sa_slot->table->session->clp->cl_mvops->minor_version;
#endif /* CONFIG_NFS_V4_1 */
	return 0;
}

/*
 * Encode an ACCESS request
 */
static void nfs4_xdr_enc_access(struct rpc_rqst *req, struct xdr_stream *xdr,
				const struct nfs4_accessargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_access(xdr, args->access, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode LOOKUP request
 */
static void nfs4_xdr_enc_lookup(struct rpc_rqst *req, struct xdr_stream *xdr,
				const struct nfs4_lookup_arg *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->dir_fh, &hdr);
	encode_lookup(xdr, args->name, &hdr);
	encode_getfh(xdr, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode LOOKUP_ROOT request
 */
static void nfs4_xdr_enc_lookup_root(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     const struct nfs4_lookup_root_arg *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putrootfh(xdr, &hdr);
	encode_getfh(xdr, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode REMOVE request
 */
static void nfs4_xdr_enc_remove(struct rpc_rqst *req, struct xdr_stream *xdr,
				const struct nfs_removeargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_remove(xdr, &args->name, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode RENAME request
 */
static void nfs4_xdr_enc_rename(struct rpc_rqst *req, struct xdr_stream *xdr,
				const struct nfs_renameargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->old_dir, &hdr);
	encode_savefh(xdr, &hdr);
	encode_putfh(xdr, args->new_dir, &hdr);
	encode_rename(xdr, args->old_name, args->new_name, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode LINK request
 */
static void nfs4_xdr_enc_link(struct rpc_rqst *req, struct xdr_stream *xdr,
			     const struct nfs4_link_arg *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_savefh(xdr, &hdr);
	encode_putfh(xdr, args->dir_fh, &hdr);
	encode_link(xdr, args->name, &hdr);
	encode_restorefh(xdr, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode CREATE request
 */
static void nfs4_xdr_enc_create(struct rpc_rqst *req, struct xdr_stream *xdr,
				const struct nfs4_create_arg *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->dir_fh, &hdr);
	encode_create(xdr, args, &hdr);
	encode_getfh(xdr, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode SYMLINK request
 */
static void nfs4_xdr_enc_symlink(struct rpc_rqst *req, struct xdr_stream *xdr,
				 const struct nfs4_create_arg *args)
{
	nfs4_xdr_enc_create(req, xdr, args);
}

/*
 * Encode GETATTR request
 */
static void nfs4_xdr_enc_getattr(struct rpc_rqst *req, struct xdr_stream *xdr,
				 const struct nfs4_getattr_arg *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode a CLOSE request
 */
static void nfs4_xdr_enc_close(struct rpc_rqst *req, struct xdr_stream *xdr,
			       struct nfs_closeargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_close(xdr, args, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode an OPEN request
 */
static void nfs4_xdr_enc_open(struct rpc_rqst *req, struct xdr_stream *xdr,
			      struct nfs_openargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_open(xdr, args, &hdr);
	encode_getfh(xdr, &hdr);
	if (args->access)
		encode_access(xdr, args->access, &hdr);
	encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode an OPEN_CONFIRM request
 */
static void nfs4_xdr_enc_open_confirm(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
				      struct nfs_open_confirmargs *args)
{
	struct compound_hdr hdr = {
		.nops   = 0,
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_open_confirm(xdr, args, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode an OPEN request with no attributes.
 */
static void nfs4_xdr_enc_open_noattr(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     struct nfs_openargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_open(xdr, args, &hdr);
	if (args->access)
		encode_access(xdr, args->access, &hdr);
	encode_getfattr_open(xdr, args->bitmask, args->open_bitmap, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode an OPEN_DOWNGRADE request
 */
static void nfs4_xdr_enc_open_downgrade(struct rpc_rqst *req,
					struct xdr_stream *xdr,
					struct nfs_closeargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_open_downgrade(xdr, args, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode a LOCK request
 */
static void nfs4_xdr_enc_lock(struct rpc_rqst *req, struct xdr_stream *xdr,
			      struct nfs_lock_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_lock(xdr, args, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode a LOCKT request
 */
static void nfs4_xdr_enc_lockt(struct rpc_rqst *req, struct xdr_stream *xdr,
			       struct nfs_lockt_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_lockt(xdr, args, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode a LOCKU request
 */
static void nfs4_xdr_enc_locku(struct rpc_rqst *req, struct xdr_stream *xdr,
			       struct nfs_locku_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_locku(xdr, args, &hdr);
	encode_nops(&hdr);
}

static void nfs4_xdr_enc_release_lockowner(struct rpc_rqst *req,
					   struct xdr_stream *xdr,
					struct nfs_release_lockowner_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = 0,
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_release_lockowner(xdr, &args->lock_owner, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode a READLINK request
 */
static void nfs4_xdr_enc_readlink(struct rpc_rqst *req, struct xdr_stream *xdr,
				  const struct nfs4_readlink *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_readlink(xdr, args, req, &hdr);

	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
			args->pgbase, args->pglen);
	encode_nops(&hdr);
}

/*
 * Encode a READDIR request
 */
static void nfs4_xdr_enc_readdir(struct rpc_rqst *req, struct xdr_stream *xdr,
				 const struct nfs4_readdir_arg *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_readdir(xdr, args, req, &hdr);

	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, args->pages,
			 args->pgbase, args->count);
	dprintk("%s: inlined page args = (%u, %p, %u, %u)\n",
			__func__, hdr.replen << 2, args->pages,
			args->pgbase, args->count);
	encode_nops(&hdr);
}

/*
 * Encode a READ request
 */
static void nfs4_xdr_enc_read(struct rpc_rqst *req, struct xdr_stream *xdr,
			      struct nfs_readargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_read(xdr, args, &hdr);

	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
			 args->pages, args->pgbase, args->count);
	req->rq_rcv_buf.flags |= XDRBUF_READ;
	encode_nops(&hdr);
}

/*
 * Encode an SETATTR request
 */
static void nfs4_xdr_enc_setattr(struct rpc_rqst *req, struct xdr_stream *xdr,
				 struct nfs_setattrargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_setattr(xdr, args, args->server, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode a GETACL request
 */
static void nfs4_xdr_enc_getacl(struct rpc_rqst *req, struct xdr_stream *xdr,
				struct nfs_getaclargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};
	uint32_t replen;

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	replen = hdr.replen + op_decode_hdr_maxsz + 1;
	encode_getattr_two(xdr, FATTR4_WORD0_ACL, 0, &hdr);

	xdr_inline_pages(&req->rq_rcv_buf, replen << 2,
		args->acl_pages, args->acl_pgbase, args->acl_len);

	encode_nops(&hdr);
}

/*
 * Encode a WRITE request
 */
static void nfs4_xdr_enc_write(struct rpc_rqst *req, struct xdr_stream *xdr,
			       struct nfs_writeargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_write(xdr, args, &hdr);
	req->rq_snd_buf.flags |= XDRBUF_WRITE;
	if (args->bitmask)
		encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

/*
 *  a COMMIT request
 */
static void nfs4_xdr_enc_commit(struct rpc_rqst *req, struct xdr_stream *xdr,
				struct nfs_commitargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_commit(xdr, args, &hdr);
	encode_nops(&hdr);
}

/*
 * FSINFO request
 */
static void nfs4_xdr_enc_fsinfo(struct rpc_rqst *req, struct xdr_stream *xdr,
				struct nfs4_fsinfo_arg *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_fsinfo(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

/*
 * a PATHCONF request
 */
static void nfs4_xdr_enc_pathconf(struct rpc_rqst *req, struct xdr_stream *xdr,
				  const struct nfs4_pathconf_arg *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_getattr_one(xdr, args->bitmask[0] & nfs4_pathconf_bitmap[0],
			   &hdr);
	encode_nops(&hdr);
}

/*
 * a STATFS request
 */
static void nfs4_xdr_enc_statfs(struct rpc_rqst *req, struct xdr_stream *xdr,
				const struct nfs4_statfs_arg *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_getattr_two(xdr, args->bitmask[0] & nfs4_statfs_bitmap[0],
			   args->bitmask[1] & nfs4_statfs_bitmap[1], &hdr);
	encode_nops(&hdr);
}

/*
 * GETATTR_BITMAP request
 */
static void nfs4_xdr_enc_server_caps(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     struct nfs4_server_caps_arg *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fhandle, &hdr);
	encode_getattr_one(xdr, FATTR4_WORD0_SUPPORTED_ATTRS|
			   FATTR4_WORD0_FH_EXPIRE_TYPE|
			   FATTR4_WORD0_LINK_SUPPORT|
			   FATTR4_WORD0_SYMLINK_SUPPORT|
			   FATTR4_WORD0_ACLSUPPORT, &hdr);
	encode_nops(&hdr);
}

/*
 * a RENEW request
 */
static void nfs4_xdr_enc_renew(struct rpc_rqst *req, struct xdr_stream *xdr,
			       struct nfs_client *clp)
{
	struct compound_hdr hdr = {
		.nops	= 0,
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_renew(xdr, clp->cl_clientid, &hdr);
	encode_nops(&hdr);
}

/*
 * a SETCLIENTID request
 */
static void nfs4_xdr_enc_setclientid(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     struct nfs4_setclientid *sc)
{
	struct compound_hdr hdr = {
		.nops	= 0,
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_setclientid(xdr, sc, &hdr);
	encode_nops(&hdr);
}

/*
 * a SETCLIENTID_CONFIRM request
 */
static void nfs4_xdr_enc_setclientid_confirm(struct rpc_rqst *req,
					     struct xdr_stream *xdr,
					     struct nfs4_setclientid_res *arg)
{
	struct compound_hdr hdr = {
		.nops	= 0,
	};
	const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };

	encode_compound_hdr(xdr, req, &hdr);
	encode_setclientid_confirm(xdr, arg, &hdr);
	encode_putrootfh(xdr, &hdr);
	encode_fsinfo(xdr, lease_bitmap, &hdr);
	encode_nops(&hdr);
}

/*
 * DELEGRETURN request
 */
static void nfs4_xdr_enc_delegreturn(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     const struct nfs4_delegreturnargs *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fhandle, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_delegreturn(xdr, args->stateid, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode FS_LOCATIONS request
 */
static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
				      struct nfs4_fs_locations_arg *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};
	uint32_t replen;

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->dir_fh, &hdr);
	encode_lookup(xdr, args->name, &hdr);
	replen = hdr.replen;	/* get the attribute into args->page */
	encode_fs_locations(xdr, args->bitmask, &hdr);

	xdr_inline_pages(&req->rq_rcv_buf, replen << 2, &args->page,
			0, PAGE_SIZE);
	encode_nops(&hdr);
}

/*
 * Encode SECINFO request
 */
static void nfs4_xdr_enc_secinfo(struct rpc_rqst *req,
				struct xdr_stream *xdr,
				struct nfs4_secinfo_arg *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->dir_fh, &hdr);
	encode_secinfo(xdr, args->name, &hdr);
	encode_nops(&hdr);
}

#if defined(CONFIG_NFS_V4_1)
/*
 * BIND_CONN_TO_SESSION request
 */
static void nfs4_xdr_enc_bind_conn_to_session(struct rpc_rqst *req,
				struct xdr_stream *xdr,
				struct nfs_client *clp)
{
	struct compound_hdr hdr = {
		.minorversion = clp->cl_mvops->minor_version,
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_bind_conn_to_session(xdr, clp->cl_session, &hdr);
	encode_nops(&hdr);
}

/*
 * EXCHANGE_ID request
 */
static void nfs4_xdr_enc_exchange_id(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     struct nfs41_exchange_id_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = args->client->cl_mvops->minor_version,
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_exchange_id(xdr, args, &hdr);
	encode_nops(&hdr);
}

/*
 * a CREATE_SESSION request
 */
static void nfs4_xdr_enc_create_session(struct rpc_rqst *req,
					struct xdr_stream *xdr,
					struct nfs41_create_session_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = args->client->cl_mvops->minor_version,
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_create_session(xdr, args, &hdr);
	encode_nops(&hdr);
}

/*
 * a DESTROY_SESSION request
 */
static void nfs4_xdr_enc_destroy_session(struct rpc_rqst *req,
					 struct xdr_stream *xdr,
					 struct nfs4_session *session)
{
	struct compound_hdr hdr = {
		.minorversion = session->clp->cl_mvops->minor_version,
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_destroy_session(xdr, session, &hdr);
	encode_nops(&hdr);
}

/*
 * a DESTROY_CLIENTID request
 */
static void nfs4_xdr_enc_destroy_clientid(struct rpc_rqst *req,
					 struct xdr_stream *xdr,
					 struct nfs_client *clp)
{
	struct compound_hdr hdr = {
		.minorversion = clp->cl_mvops->minor_version,
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_destroy_clientid(xdr, clp->cl_clientid, &hdr);
	encode_nops(&hdr);
}

/*
 * a SEQUENCE request
 */
static void nfs4_xdr_enc_sequence(struct rpc_rqst *req, struct xdr_stream *xdr,
				  struct nfs4_sequence_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, args, &hdr);
	encode_nops(&hdr);
}

/*
 * a GET_LEASE_TIME request
 */
static void nfs4_xdr_enc_get_lease_time(struct rpc_rqst *req,
					struct xdr_stream *xdr,
					struct nfs4_get_lease_time_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->la_seq_args),
	};
	const u32 lease_bitmap[3] = { FATTR4_WORD0_LEASE_TIME };

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->la_seq_args, &hdr);
	encode_putrootfh(xdr, &hdr);
	encode_fsinfo(xdr, lease_bitmap, &hdr);
	encode_nops(&hdr);
}

/*
 * a RECLAIM_COMPLETE request
 */
static void nfs4_xdr_enc_reclaim_complete(struct rpc_rqst *req,
					  struct xdr_stream *xdr,
				struct nfs41_reclaim_complete_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args)
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_reclaim_complete(xdr, args, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode GETDEVICELIST request
 */
static void nfs4_xdr_enc_getdevicelist(struct rpc_rqst *req,
				       struct xdr_stream *xdr,
				       struct nfs4_getdevicelist_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, args->fh, &hdr);
	encode_getdevicelist(xdr, args, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode GETDEVICEINFO request
 */
static void nfs4_xdr_enc_getdeviceinfo(struct rpc_rqst *req,
				       struct xdr_stream *xdr,
				       struct nfs4_getdeviceinfo_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_getdeviceinfo(xdr, args, &hdr);

	/* set up reply kvec. Subtract notification bitmap max size (2)
	 * so that notification bitmap is put in xdr_buf tail */
	xdr_inline_pages(&req->rq_rcv_buf, (hdr.replen - 2) << 2,
			 args->pdev->pages, args->pdev->pgbase,
			 args->pdev->pglen);

	encode_nops(&hdr);
}

/*
 *  Encode LAYOUTGET request
 */
static void nfs4_xdr_enc_layoutget(struct rpc_rqst *req,
				   struct xdr_stream *xdr,
				   struct nfs4_layoutget_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
	encode_layoutget(xdr, args, &hdr);

	xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2,
	    args->layout.pages, 0, args->layout.pglen);

	encode_nops(&hdr);
}

/*
 *  Encode LAYOUTCOMMIT request
 */
static void nfs4_xdr_enc_layoutcommit(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
				      struct nfs4_layoutcommit_args *args)
{
	struct nfs4_layoutcommit_data *data =
		container_of(args, struct nfs4_layoutcommit_data, args);
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
	encode_layoutcommit(xdr, data->args.inode, args, &hdr);
	encode_getfattr(xdr, args->bitmask, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode LAYOUTRETURN request
 */
static void nfs4_xdr_enc_layoutreturn(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
				      struct nfs4_layoutreturn_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putfh(xdr, NFS_FH(args->inode), &hdr);
	encode_layoutreturn(xdr, args, &hdr);
	encode_nops(&hdr);
}

/*
 * Encode SECINFO_NO_NAME request
 */
static int nfs4_xdr_enc_secinfo_no_name(struct rpc_rqst *req,
					struct xdr_stream *xdr,
					struct nfs41_secinfo_no_name_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_putrootfh(xdr, &hdr);
	encode_secinfo_no_name(xdr, args, &hdr);
	encode_nops(&hdr);
	return 0;
}

/*
 *  Encode TEST_STATEID request
 */
static void nfs4_xdr_enc_test_stateid(struct rpc_rqst *req,
				      struct xdr_stream *xdr,
				      struct nfs41_test_stateid_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_test_stateid(xdr, args, &hdr);
	encode_nops(&hdr);
}

/*
 *  Encode FREE_STATEID request
 */
static void nfs4_xdr_enc_free_stateid(struct rpc_rqst *req,
				     struct xdr_stream *xdr,
				     struct nfs41_free_stateid_args *args)
{
	struct compound_hdr hdr = {
		.minorversion = nfs4_xdr_minorversion(&args->seq_args),
	};

	encode_compound_hdr(xdr, req, &hdr);
	encode_sequence(xdr, &args->seq_args, &hdr);
	encode_free_stateid(xdr, args, &hdr);
	encode_nops(&hdr);
}
#endif /* CONFIG_NFS_V4_1 */

static void print_overflow_msg(const char *func, const struct xdr_stream *xdr)
{
	dprintk("nfs: %s: prematurely hit end of receive buffer. "
		"Remaining buffer length is %tu words.\n",
		func, xdr->end - xdr->p);
}

static int decode_opaque_inline(struct xdr_stream *xdr, unsigned int *len, char **string)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 4);
	if (unlikely(!p))
		goto out_overflow;
	*len = be32_to_cpup(p);
	p = xdr_inline_decode(xdr, *len);
	if (unlikely(!p))
		goto out_overflow;
	*string = (char *)p;
	return 0;
out_overflow:
	print_overflow_msg(__func__, xdr);
	return -EIO;
}

static int decode_compound_hdr(struct xdr_stream *xdr, struct compound_hdr *hdr)
{
	__be32 *p;

	p = xdr_inline_decode(xdr, 8);
	if (unlikely(!p))
		goto out_overflow;