NFS: Enable NFSv4 callback server to listen on AF_INET6 sockets

Allow the NFS callback server to listen for requests via an AF_INET6 or
AF_INET socket when IPv6 support is present in the kernel.

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 6a09760c5960fd427935c2306f5080caa66bce3b..c2e9cfd9e5a4d04e3c3a6a82e2f49c8deb8821e6 100644 (file)
--- 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;
 }