Index: linux-3.10.0-123.13.2.el7.x86_64/fs/ext4/ext4.h
===================================================================
--- linux-3.10.0-123.13.2.el7.x86_64.orig/fs/ext4/ext4.h
+++ linux-3.10.0-123.13.2.el7.x86_64/fs/ext4/ext4.h
@@ -2145,6 +2145,13 @@ extern int ext4_orphan_add(handle_t *, s
 extern int ext4_orphan_del(handle_t *, struct inode *);
 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
 				__u32 start_minor_hash, __u32 *next_hash);
+extern struct inode *ext4_create_inode(handle_t *handle,
+				       struct inode * dir, int mode);
+extern int ext4_delete_entry(handle_t *handle, struct inode * dir,
+			     struct ext4_dir_entry_2 * de_del,
+			     struct buffer_head * bh);
+extern int ext4_add_dot_dotdot(handle_t *handle, struct inode *dir,
+			       struct inode *inode);
 extern int search_dir(struct buffer_head *bh,
 		      char *search_buf,
 		      int buf_size,
Index: linux-3.10.0-123.13.2.el7.x86_64/fs/ext4/namei.c
===================================================================
--- linux-3.10.0-123.13.2.el7.x86_64.orig/fs/ext4/namei.c
+++ linux-3.10.0-123.13.2.el7.x86_64/fs/ext4/namei.c
@@ -2165,7 +2167,7 @@ int ext4_generic_delete_entry(handle_t *
 	return -ENOENT;
 }
 
-static int ext4_delete_entry(handle_t *handle,
+int ext4_delete_entry(handle_t *handle,
 			     struct inode *dir,
 			     struct ext4_dir_entry_2 *de_del,
 			     struct buffer_head *bh)
@@ -2206,7 +2208,7 @@ out:
 		ext4_std_error(dir->i_sb, err);
 	return err;
 }
-
+EXPORT_SYMBOL(ext4_delete_entry);
 /*
  * DIR_NLINK feature is set if 1) nlinks > EXT4_LINK_MAX or 2) nlinks == 2,
  * since this indicates that nlinks count was previously 1.
@@ -2253,6 +2255,28 @@ static int ext4_add_nondir(handle_t *han
 	return err;
 }
 
+ /* Return locked inode, then the caller can modify the inode's states/flags
+  * before others finding it. The caller should unlock the inode by itself. */
+struct inode * ext4_create_inode(handle_t *handle, struct inode * dir, int mode)
+{
+	struct inode *inode;
+
+	inode = ext4_new_inode(handle, dir, mode, NULL, 0, NULL);
+	if (!IS_ERR(inode)) {
+		if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode)) {
+#ifdef CONFIG_LDISKFS_FS_XATTR
+			inode->i_op = &ext4_special_inode_operations;
+#endif
+		} else {
+			inode->i_op = &ext4_file_inode_operations;
+			inode->i_fop = &ext4_file_operations;
+			ext4_set_aops(inode);
+		}
+	}
+	return inode;
+}
+EXPORT_SYMBOL(ext4_create_inode);
+
 /*
  * By the time this is called, we already have created
  * the directory cache entry for the new file, but it
@@ -2402,6 +2426,23 @@ out:
 	return err;
 }
 
+/* Initialize @inode as a subdirectory of @dir, and add the
+ * "." and ".." entries into the first directory block. */
+int ext4_add_dot_dotdot(handle_t *handle, struct inode * dir,
+			struct inode *inode)
+{
+	if (IS_ERR(handle))
+		return PTR_ERR(handle);
+
+	if (IS_DIRSYNC(dir))
+		ext4_handle_sync(handle);
+
+	inode->i_op = &ext4_dir_inode_operations.ops;
+	inode->i_fop = &ext4_dir_operations;
+	return ext4_init_new_dir(handle, dir, inode);
+}
+EXPORT_SYMBOL(ext4_add_dot_dotdot);
+
 static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 {
 	handle_t *handle;