NFS: Add secinfo procedure

This patch adds the nfs4 operation secinfo as a
valid nfs rpc operation.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 71ee679..3f32bf1 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -3,6 +3,7 @@
 
 #include <linux/nfsacl.h>
 #include <linux/nfs3.h>
+#include <linux/sunrpc/gss_api.h>
 
 /*
  * To change the maximum rsize and wsize supported by the NFS client, adjust
@@ -14,6 +15,9 @@
 #define NFS_DEF_FILE_IO_SIZE	(4096U)
 #define NFS_MIN_FILE_IO_SIZE	(1024U)
 
+/* Forward declaration for NFS v3 */
+struct nfs4_secinfo_flavors;
+
 struct nfs_fsid {
 	uint64_t		major;
 	uint64_t		minor;
@@ -936,6 +940,38 @@
 	struct nfs4_sequence_res	seq_res;
 };
 
+struct nfs4_secinfo_oid {
+	unsigned int len;
+	char data[GSS_OID_MAX_LEN];
+};
+
+struct nfs4_secinfo_gss {
+	struct nfs4_secinfo_oid sec_oid4;
+	unsigned int qop4;
+	unsigned int service;
+};
+
+struct nfs4_secinfo_flavor {
+	unsigned int 		flavor;
+	struct nfs4_secinfo_gss	gss;
+};
+
+struct nfs4_secinfo_flavors {
+	unsigned int num_flavors;
+	struct nfs4_secinfo_flavor flavors[0];
+};
+
+struct nfs4_secinfo_arg {
+	const struct nfs_fh		*dir_fh;
+	const struct qstr		*name;
+	struct nfs4_sequence_args	seq_args;
+};
+
+struct nfs4_secinfo_res {
+	struct nfs4_secinfo_flavors	*flavors;
+	struct nfs4_sequence_res	seq_res;
+};
+
 #endif /* CONFIG_NFS_V4 */
 
 struct nfstime4 {
@@ -1118,6 +1154,7 @@
 				struct iattr *iattr);
 	int	(*init_client) (struct nfs_client *, const struct rpc_timeout *,
 				const char *, rpc_authflavor_t, int);
+	int	(*secinfo)(struct inode *, const struct qstr *, struct nfs4_secinfo_flavors *);
 };
 
 /*