nfs41: add support for callback with RPC version number 4

The NFSv4.1 spec-29 (18.36.3) says that the server MUST use an ONC RPC
(program) version number equal to 4 in callbacks sent to the client.
For now we allow both versions 1 and 4.

Signed-off-by: Alexandros Batsakis <batsakis@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

4 files changed, 10 insertions, 0 deletions

diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index e66ec5d169f7..73ab220354df 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -385,6 +385,7 @@ static int nfs_callback_authenticate(struct svc_rqst *rqstp)
  */
 static struct svc_version *nfs4_callback_version[] = {
         [1] = &nfs4_callback_version1,
+        [4] = &nfs4_callback_version4,
 };
 
 static struct svc_stat nfs4_callback_stats;
diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
index 76b0aa0f73bf..0fda5e66241d 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -718,3 +718,10 @@ struct svc_version nfs4_callback_version1 = {
         .vs_dispatch = NULL,
 };
 
+struct svc_version nfs4_callback_version4 = {
+        .vs_vers = 4,
+        .vs_nproc = ARRAY_SIZE(nfs4_callback_procedures1),
+        .vs_proc = nfs4_callback_procedures1,
+        .vs_xdrsize = NFS4_CALLBACK_XDRSIZE,
+        .vs_dispatch = NULL,
+};
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index a6f7b6cbfd09..7b890ba37fa2 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -156,6 +156,7 @@ struct vfsmount *nfs_do_refmount(const struct vfsmount *mnt_parent, struct dentr
 
 /* callback_xdr.c */
 extern struct svc_version nfs4_callback_version1;
+extern struct svc_version nfs4_callback_version4;
 
 /* pagelist.c */
 extern int __init nfs_init_nfspagecache(void);
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 5c7740178a08..0d25a82451d9 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -290,6 +290,7 @@ struct nfs4_mount_data;
 
 /* callback_xdr.c */
 extern struct svc_version nfs4_callback_version1;
+extern struct svc_version nfs4_callback_version4;
 
 #else