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authorStanislav Kinsbursky <skinsbursky@parallels.com>2012-09-18 13:37:12 +0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-10-01 15:27:34 -0700
commite9406db20fecbfcab646bad157b4cfdc7cadddfb (patch)
tree292fcb0062d86eb7170de559fdd211b21dbe40da /fs/lockd
parent1dc42e04b75779d321f1d17dca3873004066f667 (diff)
downloadlinux-e9406db20fecbfcab646bad157b4cfdc7cadddfb.tar.gz
lockd: per-net NSM client creation and destruction helpers introduced
NSM RPC client can be required on NFSv3 umount, when child reaper is dying (and destroying it's mount namespace). It means, that current nsproxy is set to NULL already, but creation of RPC client requires UTS namespace for gaining hostname string. This patch introduces reference counted NFS RPC clients creation and destruction helpers (similar to RPCBIND RPC clients). Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Cc: <stable@vger.kernel.org> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/lockd')
-rw-r--r--fs/lockd/mon.c51
-rw-r--r--fs/lockd/netns.h4
-rw-r--r--fs/lockd/svc.c1
3 files changed, 54 insertions, 2 deletions
diff --git a/fs/lockd/mon.c b/fs/lockd/mon.c
index 7ef14b3c5be..38f240e104c 100644
--- a/fs/lockd/mon.c
+++ b/fs/lockd/mon.c
@@ -19,6 +19,8 @@
#include <asm/unaligned.h>
+#include "netns.h"
+
#define NLMDBG_FACILITY NLMDBG_MONITOR
#define NSM_PROGRAM 100024
#define NSM_VERSION 1
@@ -70,7 +72,7 @@ static struct rpc_clnt *nsm_create(struct net *net)
};
struct rpc_create_args args = {
.net = net,
- .protocol = XPRT_TRANSPORT_UDP,
+ .protocol = XPRT_TRANSPORT_TCP,
.address = (struct sockaddr *)&sin,
.addrsize = sizeof(sin),
.servername = "rpc.statd",
@@ -83,6 +85,51 @@ static struct rpc_clnt *nsm_create(struct net *net)
return rpc_create(&args);
}
+__maybe_unused static struct rpc_clnt *nsm_client_get(struct net *net)
+{
+ static DEFINE_MUTEX(nsm_create_mutex);
+ struct rpc_clnt *clnt;
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+
+ spin_lock(&ln->nsm_clnt_lock);
+ if (ln->nsm_users) {
+ ln->nsm_users++;
+ clnt = ln->nsm_clnt;
+ spin_unlock(&ln->nsm_clnt_lock);
+ goto out;
+ }
+ spin_unlock(&ln->nsm_clnt_lock);
+
+ mutex_lock(&nsm_create_mutex);
+ clnt = nsm_create(net);
+ if (!IS_ERR(clnt)) {
+ ln->nsm_clnt = clnt;
+ smp_wmb();
+ ln->nsm_users = 1;
+ }
+ mutex_unlock(&nsm_create_mutex);
+out:
+ return clnt;
+}
+
+__maybe_unused static void nsm_client_put(struct net *net)
+{
+ struct lockd_net *ln = net_generic(net, lockd_net_id);
+ struct rpc_clnt *clnt = ln->nsm_clnt;
+ int shutdown = 0;
+
+ spin_lock(&ln->nsm_clnt_lock);
+ if (ln->nsm_users) {
+ if (--ln->nsm_users)
+ ln->nsm_clnt = NULL;
+ shutdown = !ln->nsm_users;
+ }
+ spin_unlock(&ln->nsm_clnt_lock);
+
+ if (shutdown)
+ rpc_shutdown_client(clnt);
+}
+
static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res,
struct net *net)
{
@@ -111,7 +158,7 @@ static int nsm_mon_unmon(struct nsm_handle *nsm, u32 proc, struct nsm_res *res,
memset(res, 0, sizeof(*res));
msg.rpc_proc = &clnt->cl_procinfo[proc];
- status = rpc_call_sync(clnt, &msg, 0);
+ status = rpc_call_sync(clnt, &msg, RPC_TASK_SOFTCONN);
if (status < 0)
dprintk("lockd: NSM upcall RPC failed, status=%d\n",
status);
diff --git a/fs/lockd/netns.h b/fs/lockd/netns.h
index 4eee248ba96..5010b55628b 100644
--- a/fs/lockd/netns.h
+++ b/fs/lockd/netns.h
@@ -12,6 +12,10 @@ struct lockd_net {
struct delayed_work grace_period_end;
struct lock_manager lockd_manager;
struct list_head grace_list;
+
+ spinlock_t nsm_clnt_lock;
+ unsigned int nsm_users;
+ struct rpc_clnt *nsm_clnt;
};
extern int lockd_net_id;
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index 31a63f87b80..7e355870d51 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -596,6 +596,7 @@ static int lockd_init_net(struct net *net)
INIT_DELAYED_WORK(&ln->grace_period_end, grace_ender);
INIT_LIST_HEAD(&ln->grace_list);
+ spin_lock_init(&ln->nsm_clnt_lock);
return 0;
}