LockD: manage used host count per networks namespace

This patch introduces moves nrhosts in per-net data.
It also adds kernel warning to nlm_shutdown_hosts_net() about remaining hosts
in specified network namespace context.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

2 files changed, 19 insertions, 0 deletions

diff --git a/fs/lockd/host.c b/fs/lockd/host.c
index 3636734fe2ba..6c56090ca531 100644
--- a/fs/lockd/host.c
+++ b/fs/lockd/host.c
@@ -173,6 +173,7 @@ out:
 static void nlm_destroy_host_locked(struct nlm_host *host)
 {
         struct rpc_clnt *clnt;
+        struct lockd_net *ln = net_generic(host->net, lockd_net_id);
 
         dprintk("lockd: destroy host %s\n", host->h_name);
 
@@ -189,6 +190,7 @@ static void nlm_destroy_host_locked(struct nlm_host *host)
                 rpc_shutdown_client(clnt);
         kfree(host);
 
+        ln->nrhosts--;
         nrhosts--;
 }
 
@@ -229,6 +231,7 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
         struct hlist_node *pos;
         struct nlm_host *host;
         struct nsm_handle *nsm = NULL;
+        struct lockd_net *ln = net_generic(net, lockd_net_id);
 
         dprintk("lockd: %s(host='%s', vers=%u, proto=%s)\n", __func__,
                         (hostname ? hostname : "<none>"), version,
@@ -263,6 +266,7 @@ struct nlm_host *nlmclnt_lookup_host(const struct sockaddr *sap,
                 goto out;
 
         hlist_add_head(&host->h_hash, chain);
+        ln->nrhosts++;
         nrhosts++;
 
         dprintk("lockd: %s created host %s (%s)\n", __func__,
@@ -384,6 +388,7 @@ struct nlm_host *nlmsvc_lookup_host(const struct svc_rqst *rqstp,
         memcpy(nlm_srcaddr(host), src_sap, src_len);
         host->h_srcaddrlen = src_len;
         hlist_add_head(&host->h_hash, chain);
+        ln->nrhosts++;
         nrhosts++;
 
         dprintk("lockd: %s created host %s (%s)\n",
@@ -592,6 +597,19 @@ nlm_shutdown_hosts_net(struct net *net)
         /* Then, perform a garbage collection pass */
         nlm_gc_hosts(net);
         mutex_unlock(&nlm_host_mutex);
+
+        /* complain if any hosts are left */
+        if (net) {
+                struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+                printk(KERN_WARNING "lockd: couldn't shutdown host module for net %p!\n", net);
+                dprintk("lockd: %lu hosts left in net %p:\n", ln->nrhosts, net);
+                for_each_host(host, pos, chain, nlm_server_hosts) {
+                        dprintk("       %s (cnt %d use %d exp %ld net %p)\n",
+                                host->h_name, atomic_read(&host->h_count),
+                                host->h_inuse, host->h_expires, host->net);
+                }
+        }
 }
 
 /*
diff --git a/fs/lockd/netns.h b/fs/lockd/netns.h
index 97c6c771133f..44c8f0b9230a 100644
--- a/fs/lockd/netns.h
+++ b/fs/lockd/netns.h
@@ -6,6 +6,7 @@
 struct lockd_net {
         unsigned int nlmsvc_users;
         unsigned long next_gc;
+        unsigned long nrhosts;
 };
 
 extern int lockd_net_id;