NFS: Start PF_INET6 callback listener only if IPv6 support is available

Apparently a lot of people need to disable IPv6 completely on their
distributor-built systems, which have CONFIG_IPV6_MODULE enabled at
build time.

They do this by blacklisting the ipv6.ko module.  This causes the
creation of the NFSv4 callback service listener to fail if
CONFIG_IPV6_MODULE is set, but the module cannot be loaded.

Now that the kernel's PF_INET6 RPC listeners are completely separate
from PF_INET listeners, we can always start PF_INET.  Then the NFS
client can try to start a PF_INET6 listener, but it isn't required
to be available.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 0ef47df..a886e69 100644 (file)
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -38,6 +38,7 @@ static struct svc_program nfs4_callback_program;
 
 unsigned int nfs_callback_set_tcpport;
 unsigned short nfs_callback_tcpport;
+unsigned short nfs_callback_tcpport6;
 static const int nfs_set_port_min = 0;
 static const int nfs_set_port_max = 65535;
 
@@ -119,6 +120,17 @@ int nfs_callback_up(void)
        dprintk("NFS: Callback listener port = %u (af %u)\n",
                        nfs_callback_tcpport, PF_INET);
 
+#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
+       ret = svc_create_xprt(serv, "tcp", PF_INET6,
+                               nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
+       if (ret > 0) {
+               nfs_callback_tcpport6 = ret;
+               dprintk("NFS: Callback listener port = %u (af %u)\n",
+                               nfs_callback_tcpport6, PF_INET6);
+       } else if (ret != -EAFNOSUPPORT)
+               goto out_err;
+#endif /* defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) */
+
        nfs_callback_info.rqst = svc_prepare_thread(serv, &serv->sv_pools[0]);
        if (IS_ERR(nfs_callback_info.rqst)) {
                ret = PTR_ERR(nfs_callback_info.rqst);

diff --git a/fs/nfs/callback.h b/fs/nfs/callback.h
index bb25d21..e110e28 100644 (file)
--- a/fs/nfs/callback.h
+++ b/fs/nfs/callback.h
@@ -72,5 +72,6 @@ extern void nfs_callback_down(void);
 
 extern unsigned int nfs_callback_set_tcpport;
 extern unsigned short nfs_callback_tcpport;
+extern unsigned short nfs_callback_tcpport6;
 
 #endif /* __LINUX_FS_NFS_CALLBACK_H */

diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 2022fe4..0298e90 100644 (file)
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -62,8 +62,14 @@ static LIST_HEAD(nfs4_clientid_list);
 
 static int nfs4_init_client(struct nfs_client *clp, struct rpc_cred *cred)
 {
-       int status = nfs4_proc_setclientid(clp, NFS4_CALLBACK,
-                       nfs_callback_tcpport, cred);
+       unsigned short port;
+       int status;
+
+       port = nfs_callback_tcpport;
+       if (clp->cl_addr.ss_family == AF_INET6)
+               port = nfs_callback_tcpport6;
+
+       status = nfs4_proc_setclientid(clp, NFS4_CALLBACK, port, cred);
        if (status == 0)
                status = nfs4_proc_setclientid_confirm(clp, cred);
        if (status == 0)