1 files changed, 17 insertions, 3 deletions

diff --git a/fs/ocfs2/dlmglue.h b/fs/ocfs2/dlmglue.h
index 30f683107f1e..7553836931de 100644
--- a/fs/ocfs2/dlmglue.h
+++ b/fs/ocfs2/dlmglue.h
@@ -78,6 +78,14 @@ struct ocfs2_orphan_scan_lvb {
 /* don't block waiting for the downconvert thread, instead return -EAGAIN */
 #define OCFS2_LOCK_NONBLOCK             (0x04)
 
+/* Locking subclasses of inode cluster lock */
+enum {
+        OI_LS_NORMAL = 0,
+        OI_LS_PARENT,
+        OI_LS_RENAME1,
+        OI_LS_RENAME2,
+};
+
 int ocfs2_dlm_init(struct ocfs2_super *osb);
 void ocfs2_dlm_shutdown(struct ocfs2_super *osb, int hangup_pending);
 void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
@@ -104,17 +112,23 @@ void ocfs2_open_unlock(struct inode *inode);
 int ocfs2_inode_lock_atime(struct inode *inode,
                           struct vfsmount *vfsmnt,
                           int *level);
-int ocfs2_inode_lock_full(struct inode *inode,
+int ocfs2_inode_lock_full_nested(struct inode *inode,
                          struct buffer_head **ret_bh,
                          int ex,
-                         int arg_flags);
+                         int arg_flags,
+                         int subclass);
 int ocfs2_inode_lock_with_page(struct inode *inode,
                               struct buffer_head **ret_bh,
                               int ex,
                               struct page *page);
+/* Variants without special locking class or flags */
+#define ocfs2_inode_lock_full(i, r, e, f)\
+                ocfs2_inode_lock_full_nested(i, r, e, f, OI_LS_NORMAL)
+#define ocfs2_inode_lock_nested(i, b, e, s)\
+                ocfs2_inode_lock_full_nested(i, b, e, 0, s)
 /* 99% of the time we don't want to supply any additional flags --
  * those are for very specific cases only. */
-#define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full(i, b, e, 0)
+#define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, 0, OI_LS_NORMAL)
 void ocfs2_inode_unlock(struct inode *inode,
                        int ex);
 int ocfs2_super_lock(struct ocfs2_super *osb,