SUNRPC: Add a helper to allow sharing of rpc_pipefs directory objects

Add support for looking up existing objects and creating new ones if there
is no match.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h
index b0cf1812be72..a353e0300b54 100644
--- a/include/linux/sunrpc/rpc_pipe_fs.h
+++ b/include/linux/sunrpc/rpc_pipe_fs.h
@@ -106,6 +106,12 @@ extern int rpc_add_pipe_dir_object(struct net *net,
 extern void rpc_remove_pipe_dir_object(struct net *net,
                 struct rpc_pipe_dir_head *pdh,
                 struct rpc_pipe_dir_object *pdo);
+extern struct rpc_pipe_dir_object *rpc_find_or_alloc_pipe_dir_object(
+                struct net *net,
+                struct rpc_pipe_dir_head *pdh,
+                int (*match)(struct rpc_pipe_dir_object *, void *),
+                struct rpc_pipe_dir_object *(*alloc)(void *),
+                void *data);
 
 struct cache_detail;
 extern struct dentry *rpc_create_cache_dir(struct dentry *,