[PATCH 2/3] SUNRPC: traverse clients tree on PipeFS event

[Stanislav Kinsbursky <skinsbursky@parallels.com>]

If client is a clone, then it's parent can not be in the list.
But parent's PipeFS dentries have to be created and destroyed as well.

Note: event skip helper for clients introduced

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>

---
 net/sunrpc/clnt.c |   30 ++++++++++++++++++++++++++----
 1 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 8a19849..80b59f1 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -176,8 +176,16 @@ rpc_setup_pipedir(struct rpc_clnt *clnt, const char *dir_name)
 	return 0;
 }
 
-static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
-				struct super_block *sb)
+static inline int rpc_clnt_skip_event(struct rpc_clnt *clnt, unsigned long event)
+{
+	if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
+	    ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
+		return 1;
+	return 0;
+}
+
+static int __rpc_clnt_handle_event(struct rpc_clnt *clnt, unsigned long event,
+				   struct super_block *sb)
 {
 	struct dentry *dentry;
 	int err = 0;
@@ -206,6 +214,21 @@ static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
 	return err;
 }
 
+static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
+				struct super_block *sb)
+{
+	int error;
+
+	if (!rpc_clnt_skip_event(clnt, event)) {
+		error = __rpc_clnt_handle_event(clnt, event, sb);
+		if (error)
+			return error;
+	}
+	if (clnt != clnt->cl_parent)
+		return __rpc_pipefs_event(clnt->cl_parent, event, sb);
+	return 0;
+}
+
 static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
 {
 	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
@@ -215,8 +238,7 @@ static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
 	list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
 		if (clnt->cl_program->pipe_dir_name == NULL)
 			break;
-		if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
-		    ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
+		if (rpc_clnt_skip_event(clnt, event))
 			continue;
 		if (atomic_inc_not_zero(&clnt->cl_count) == 0)
 			continue;