nfs41: exchange_id operation

Implement the exchange_id operation conforming to
http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-26

Unlike NFSv4.0, NFSv4.1 requires machine credentials. RPC_AUTH_GSS machine
credentials will be passed into the kernel at mount time to be available for
the exchange_id operation.

RPC_AUTH_UNIX root mounts can use the UNIX root credential. Store the root
credential in the nfs_client struct.

Without a credential, NFSv4.1 state renewal fails.

[nfs41: establish clientid via exchange id only if cred != NULL]
Signed-off-by: Andy Adamson<andros@umich.edu>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfsd41: move nfstime4 from under CONFIG_NFS_V4_1]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: do not wait a lease time in exchange id]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: pass *session in seq_args and seq_res]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
[nfs41: Ignoring impid in decode_exchange_id is missing a READ_BUF]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfs41: fix Xcode_exchange_id's xdr Xcoding pointer type]
[nfs41: get rid of unused struct nfs41_exchange_id_res members]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>

4 files changed, 47 insertions, 1 deletions

diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h
index 7c36fcf2dfb7..ad65709ed8d3 100644
--- a/include/linux/nfs4.h
+++ b/include/linux/nfs4.h
@@ -21,6 +21,7 @@
 #define NFS4_FHSIZE             128
 #define NFS4_MAXPATHLEN         PATH_MAX
 #define NFS4_MAXNAMLEN          NAME_MAX
+#define NFS4_OPAQUE_LIMIT       1024
 #define NFS4_MAX_SESSIONID_LEN  16
 
 #define NFS4_ACCESS_READ        0x0001
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 206485e5082f..435ed556efb5 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -78,6 +78,12 @@ struct nfs_client {
 #endif /* CONFIG_NFS_V4 */
 
 #ifdef CONFIG_NFS_V4_1
+        /* clientid returned from EXCHANGE_ID, used by session operations */
+        u64                     cl_ex_clid;
+        /* The sequence id to use for the next CREATE_SESSION */
+        u32                     cl_seqid;
+        /* The flags used for obtaining the clientid during EXCHANGE_ID */
+        u32                     cl_exchange_flags;
         struct nfs4_session     *cl_session;    /* sharred session */
 #endif /* CONFIG_NFS_V4_1 */
 
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 4ac14b40efc9..5d70b924af5e 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -879,6 +879,46 @@ struct nfs4_fs_locations_res {
 
 #endif /* CONFIG_NFS_V4 */
 
+struct nfstime4 {
+        u64     seconds;
+        u32     nseconds;
+};
+
+#ifdef CONFIG_NFS_V4_1
+struct nfs_impl_id4 {
+        u32             domain_len;
+        char            *domain;
+        u32             name_len;
+        char            *name;
+        struct nfstime4 date;
+};
+
+#define NFS4_EXCHANGE_ID_LEN    (48)
+struct nfs41_exchange_id_args {
+        struct nfs_client               *client;
+        nfs4_verifier                   *verifier;
+        unsigned int                    id_len;
+        char                            id[NFS4_EXCHANGE_ID_LEN];
+        u32                             flags;
+};
+
+struct server_owner {
+        uint64_t                        minor_id;
+        uint32_t                        major_id_sz;
+        char                            major_id[NFS4_OPAQUE_LIMIT];
+};
+
+struct server_scope {
+        uint32_t                        server_scope_sz;
+        char                            server_scope[NFS4_OPAQUE_LIMIT];
+};
+
+struct nfs41_exchange_id_res {
+        struct nfs_client               *client;
+        u32                             flags;
+};
+#endif /* CONFIG_NFS_V4_1 */
+
 struct nfs_page;
 
 #define NFS_PAGEVEC_SIZE        (8U)
diff --git a/include/linux/nfsd/state.h b/include/linux/nfsd/state.h
index 4d61c873feed..7ef4b7ad1214 100644
--- a/include/linux/nfsd/state.h
+++ b/include/linux/nfsd/state.h
@@ -41,7 +41,6 @@
 #include <linux/kref.h>
 #include <linux/sunrpc/clnt.h>
 
-#define NFS4_OPAQUE_LIMIT 1024
 typedef struct {
         u32             cl_boot;
         u32             cl_id;