SUNRPC: release per-net clients lock before calling PipeFS dentries creation

v3:
1) Lookup for client is performed from the beginning of the list on each PipeFS
event handling operation.

Lockdep is sad otherwise, because inode mutex is taken on PipeFS dentry
creation, which can be called on mount notification, where this per-net client
lock is taken on clients list walk.

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

diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index bb7ed2f3aee6b29594e1f8d6116c8467a57ecd62..25c3da53fb690742591f50f580ecf37bc061f5b0 100644 (file)
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -204,21 +204,37 @@ static int __rpc_pipefs_event(struct rpc_clnt *clnt, unsigned long event,
        return err;
 }
 
+static struct rpc_clnt *rpc_get_client_for_event(struct net *net, int event)
+{
+       struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+       struct rpc_clnt *clnt;
+
+       spin_lock(&sn->rpc_client_lock);
+       list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
+               if (((event == RPC_PIPEFS_MOUNT) && clnt->cl_dentry) ||
+                   ((event == RPC_PIPEFS_UMOUNT) && !clnt->cl_dentry))
+                       continue;
+               atomic_inc(&clnt->cl_count);
+               spin_unlock(&sn->rpc_client_lock);
+               return clnt;
+       }
+       spin_unlock(&sn->rpc_client_lock);
+       return NULL;
+}
+
 static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
                            void *ptr)
 {
        struct super_block *sb = ptr;
        struct rpc_clnt *clnt;
        int error = 0;
-       struct sunrpc_net *sn = net_generic(sb->s_fs_info, sunrpc_net_id);
 
-       spin_lock(&sn->rpc_client_lock);
-       list_for_each_entry(clnt, &sn->all_clients, cl_clients) {
+       while ((clnt = rpc_get_client_for_event(sb->s_fs_info, event))) {
                error = __rpc_pipefs_event(clnt, event, sb);
+               rpc_release_client(clnt);
                if (error)
                        break;
        }
-       spin_unlock(&sn->rpc_client_lock);
        return error;
 }