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authorTrond Myklebust <Trond.Myklebust@netapp.com>2013-08-27 16:27:04 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-09-01 11:12:43 -0400
commit298fc3558b9c1f5324c5ec6d5c587ca9ae6cc826 (patch)
tree2dd0fde31f3a0178eb47e53bdb4ed86878159d17 /net/sunrpc/rpc_pipe.c
parentc36dcfe1f7712b7c12df2d80359e638b9d246ce6 (diff)
downloadlinux-298fc3558b9c1f5324c5ec6d5c587ca9ae6cc826.tar.bz2
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>
Diffstat (limited to 'net/sunrpc/rpc_pipe.c')
-rw-r--r--net/sunrpc/rpc_pipe.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index a35b2f402aaa..f94567b45bb3 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -982,6 +982,41 @@ rpc_remove_pipe_dir_object(struct net *net,
}
EXPORT_SYMBOL_GPL(rpc_remove_pipe_dir_object);
+/**
+ * rpc_find_or_alloc_pipe_dir_object
+ * @net: pointer to struct net
+ * @pdh: pointer to struct rpc_pipe_dir_head
+ * @match: match struct rpc_pipe_dir_object to data
+ * @alloc: allocate a new struct rpc_pipe_dir_object
+ * @data: user defined data for match() and alloc()
+ *
+ */
+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 sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ struct rpc_pipe_dir_object *pdo;
+
+ mutex_lock(&sn->pipefs_sb_lock);
+ list_for_each_entry(pdo, &pdh->pdh_entries, pdo_head) {
+ if (!match(pdo, data))
+ continue;
+ goto out;
+ }
+ pdo = alloc(data);
+ if (!pdo)
+ goto out;
+ rpc_add_pipe_dir_object_locked(net, pdh, pdo);
+out:
+ mutex_unlock(&sn->pipefs_sb_lock);
+ return pdo;
+}
+EXPORT_SYMBOL_GPL(rpc_find_or_alloc_pipe_dir_object);
+
static void
rpc_create_pipe_dir_objects(struct rpc_pipe_dir_head *pdh)
{