diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index 53cd33293042..6c5c3f049b33 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -64,11 +64,37 @@ static void release_node(struct config_item *);
 static struct configfs_attribute *comm_attrs[];
 static struct configfs_attribute *node_attrs[];
 
+static u32 rsb_hashfn(const void *data, u32 len, u32 seed)
+{
+	const struct dlm_rsb_key *key = data;
+
+	return jhash(key->name, key->len, 0);
+}
+
+static u32 rsb_obj_hashfn(const void *data, u32 len, u32 seed)
+{
+	const struct dlm_rsb *r = data;
+
+	return r->res_hash;
+}
+
+static int rsb_obj_cmpfn(struct rhashtable_compare_arg *arg, const void *obj)
+{
+	const struct dlm_rsb_key *key = arg->key;
+	const struct dlm_rsb *r = obj;
+
+	if (key->len != r->res_length)
+		return -1;
+
+	return memcmp(&r->res_name, key->name, key->len);
+}
+
 const struct rhashtable_params dlm_rhash_rsb_params = {
 	.nelem_hint = 3, /* start small */
-	.key_len = DLM_RESNAME_MAXLEN,
-	.key_offset = offsetof(struct dlm_rsb, res_name),
 	.head_offset = offsetof(struct dlm_rsb, res_node),
+	.hashfn = rsb_hashfn,
+	.obj_hashfn = rsb_obj_hashfn,
+	.obj_cmpfn = rsb_obj_cmpfn,
 	.automatic_shrinking = true,
 };
 
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h
index 9df842421ae0..74c2e77d1b55 100644
--- a/fs/dlm/dlm_internal.h
+++ b/fs/dlm/dlm_internal.h
@@ -340,6 +340,11 @@ struct dlm_rsb {
 	char			res_name[DLM_RESNAME_MAXLEN+1];
 };
 
+struct dlm_rsb_key {
+	char name[DLM_RESNAME_MAXLEN];
+	size_t len;
+};
+
 /* dlm_master_lookup() flags */
 
 #define DLM_LU_RECOVER_DIR	1
diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c
index d73c4aed1f8a..2609e4fdeba8 100644
--- a/fs/dlm/lock.c
+++ b/fs/dlm/lock.c
@@ -625,12 +625,14 @@ static int get_rsb_struct(struct dlm_ls *ls, const void *name, int len,
 int dlm_search_rsb_tree(struct rhashtable *rhash, const void *name,
 			unsigned int len, struct dlm_rsb **r_ret)
 {
-	char key[DLM_RESNAME_MAXLEN] = {};
+	struct dlm_rsb_key key = {
+		.len = len,
+	};
 
 	if (len > DLM_RESNAME_MAXLEN)
 		return -EINVAL;
 
-	memcpy(key, name, len);
+	memcpy(key.name, name, len);
 	*r_ret = rhashtable_lookup_fast(rhash, &key, dlm_rhash_rsb_params);
 	if (*r_ret)
 		return 0;