NFS: callback per-net usage counting introduced

[pandora-kernel.git] / fs / nfs / callback.c

diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index 94aa9d8..6dfdc83 100644 (file)
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -38,8 +38,6 @@ static struct nfs_callback_data nfs_callback_info[NFS4_MAX_MINOR_VERSION + 1];
 static DEFINE_MUTEX(nfs_callback_mutex);
 static struct svc_program nfs4_callback_program;
 
-unsigned short nfs_callback_tcpport6;
-
 static int nfs4_callback_up_net(struct svc_serv *serv, struct net *net)
 {
        int ret;
@@ -56,9 +54,9 @@ static int nfs4_callback_up_net(struct svc_serv *serv, struct net *net)
        ret = svc_create_xprt(serv, "tcp", net, PF_INET6,
                                nfs_callback_set_tcpport, SVC_SOCK_ANONYMOUS);
        if (ret > 0) {
-               nfs_callback_tcpport6 = ret;
+               nn->nfs_callback_tcpport6 = ret;
                dprintk("NFS: Callback listener port = %u (af %u, net %p)\n",
-                               nfs_callback_tcpport6, PF_INET6, net);
+                               nn->nfs_callback_tcpport6, PF_INET6, net);
        } else if (ret != -EAFNOSUPPORT)
                goto out_err;
        return 0;
@@ -262,10 +260,25 @@ static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt,
        return 0;
 }
 
+static void nfs_callback_down_net(u32 minorversion, struct svc_serv *serv, struct net *net)
+{
+       struct nfs_net *nn = net_generic(net, nfs_net_id);
+
+       if (--nn->cb_users[minorversion])
+               return;
+
+       dprintk("NFS: destroy per-net callback data; net=%p\n", net);
+       svc_shutdown_net(serv, net);
+}
+
 static int nfs_callback_up_net(int minorversion, struct svc_serv *serv, struct net *net)
 {
+       struct nfs_net *nn = net_generic(net, nfs_net_id);
        int ret;
 
+       if (nn->cb_users[minorversion]++)
+               return 0;
+
        dprintk("NFS: create per-net callback data; net=%p\n", net);
 
        ret = svc_bind(serv, net);
@@ -380,7 +393,7 @@ err_create:
        return ret;
 
 err_start:
-       svc_shutdown_net(serv, net);
+       nfs_callback_down_net(minorversion, serv, net);
        dprintk("NFS: Couldn't create server thread; err = %d\n", ret);
        goto err_net;
 }
@@ -393,10 +406,10 @@ void nfs_callback_down(int minorversion, struct net *net)
        struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
 
        mutex_lock(&nfs_callback_mutex);
+       nfs_callback_down_net(minorversion, cb_info->serv, net);
        cb_info->users--;
        if (cb_info->users == 0 && cb_info->task != NULL) {
                kthread_stop(cb_info->task);
-               svc_shutdown_net(cb_info->serv, net);
                svc_exit_thread(cb_info->rqst);
                cb_info->serv = NULL;
                cb_info->rqst = NULL;