4 files changed, 27 insertions, 10 deletions

diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 6a09760c5960..c2e9cfd9e5a4 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -40,6 +40,16 @@ unsigned short nfs_callback_tcpport;
 static const int nfs_set_port_min = 0;
 static const int nfs_set_port_max = 65535;
 
+/*
+ * If the kernel has IPv6 support available, always listen for
+ * both AF_INET and AF_INET6 requests.
+ */
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+static const sa_family_t        nfs_callback_family = AF_INET6;
+#else
+static const sa_family_t        nfs_callback_family = AF_INET;
+#endif
+
 static int param_set_port(const char *val, struct kernel_param *kp)
 {
         char *endp;
@@ -106,7 +116,7 @@ int nfs_callback_up(void)
         if (nfs_callback_info.users++ || nfs_callback_info.task != NULL)
                 goto out;
         serv = svc_create(&nfs4_callback_program, NFS4_CALLBACK_BUFSIZE,
-                                AF_INET, NULL);
+                                nfs_callback_family, NULL);
         ret = -ENOMEM;
         if (!serv)
                 goto out_err;
@@ -116,7 +126,8 @@ int nfs_callback_up(void)
         if (ret <= 0)
                 goto out_err;
         nfs_callback_tcpport = ret;
-        dprintk("Callback port = 0x%x\n", nfs_callback_tcpport);
+        dprintk("NFS: Callback listener port = %u (af %u)\n",
+                        nfs_callback_tcpport, nfs_callback_family);
 
         nfs_callback_info.rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
         if (IS_ERR(nfs_callback_info.rqst)) {
@@ -149,8 +160,8 @@ out:
         mutex_unlock(&nfs_callback_mutex);
         return ret;
 out_err:
-        dprintk("Couldn't create callback socket or server thread; err = %d\n",
-                ret);
+        dprintk("NFS: Couldn't create callback socket or server thread; "
+                "err = %d\n", ret);
         nfs_callback_info.users--;
         goto out;
 }
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index c910413eaeca..83e700a2b0c0 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1659,8 +1659,10 @@ nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
                 struct nfs_open_context *ctx;
 
                 ctx = nfs_file_open_context(sattr->ia_file);
-                cred = ctx->cred;
-                state = ctx->state;
+                if (ctx) {
+                        cred = ctx->cred;
+                        state = ctx->state;
+                }
         }
 
         status = nfs4_do_setattr(inode, cred, fattr, sattr, state);
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 8b28b95c9e44..a3b0061dfd45 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2459,7 +2459,7 @@ static int nfs4_xdev_get_sb(struct file_system_type *fs_type, int flags,
                 compare_super = NULL;
 
         /* Get a superblock - note that we may end up sharing one that already exists */
-        s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
+        s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
         if (IS_ERR(s)) {
                 error = PTR_ERR(s);
                 goto out_err_nosb;
@@ -2544,7 +2544,7 @@ static int nfs4_referral_get_sb(struct file_system_type *fs_type, int flags,
                 compare_super = NULL;
 
         /* Get a superblock - note that we may end up sharing one that already exists */
-        s = sget(&nfs_fs_type, compare_super, nfs_set_super, &sb_mntdata);
+        s = sget(&nfs4_fs_type, compare_super, nfs_set_super, &sb_mntdata);
         if (IS_ERR(s)) {
                 error = PTR_ERR(s);
                 goto out_err_nosb;
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index ac8d0233b05c..4eaa8347a0d9 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -367,8 +367,12 @@ static inline struct nfs_open_context *nfs_file_open_context(struct file *filp)
 
 static inline struct rpc_cred *nfs_file_cred(struct file *file)
 {
-        if (file != NULL)
-                return nfs_file_open_context(file)->cred;
+        if (file != NULL) {
+                struct nfs_open_context *ctx =
+                        nfs_file_open_context(file);
+                if (ctx)
+                        return ctx->cred;
+        }
         return NULL;
 }