ocfs2: Separate out dlm lock functions.

This is the first in a series of patches to isolate ocfs2 from the
underlying cluster stack. Here we wrap the dlm locking functions with
ocfs2-specific calls. Because ocfs2 always uses the same dlm lock status
callbacks, we can eliminate the callbacks from the filesystem visible
functions.

Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/fs/ocfs2/stackglue.h b/fs/ocfs2/stackglue.h
new file mode 100644
index 00000000000..40a00241340
--- /dev/null
+++ b/fs/ocfs2/stackglue.h
@@ -0,0 +1,45 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * stackglue.h
+ *
+ * Glue to the underlying cluster stack.
+ *
+ * Copyright (C) 2007 Oracle.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+
+#ifndef STACKGLUE_H
+#define STACKGLUE_H
+
+struct ocfs2_locking_protocol {
+        void (*lp_lock_ast)(void *astarg);
+        void (*lp_blocking_ast)(void *astarg, int level);
+        void (*lp_unlock_ast)(void *astarg, enum dlm_status status);
+};
+
+enum dlm_status ocfs2_dlm_lock(struct dlm_ctxt *dlm,
+                   int mode,
+                   struct dlm_lockstatus *lksb,
+                   u32 flags,
+                   void *name,
+                   unsigned int namelen,
+                   void *astarg);
+enum dlm_status ocfs2_dlm_unlock(struct dlm_ctxt *dlm,
+                     struct dlm_lockstatus *lksb,
+                     u32 flags,
+                     void *astarg);
+
+void o2cb_get_stack(struct ocfs2_locking_protocol *proto);
+void o2cb_put_stack(void);
+
+#endif  /* STACKGLUE_H */