[RFC PATCH 2/5] btrfs-progs: header file of snapshot diff

[Jeff Liu <jeff.liu@oracle.com>]

Maybe it's better to put those #defines to the source file of snapshot diff as no other modules
need them.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>

---
 diff-snapshot.h |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 47 insertions(+), 0 deletions(-)
 create mode 100644 diff-snapshot.h

diff --git a/diff-snapshot.h b/diff-snapshot.h
new file mode 100644
index 0000000..0ba09da
--- /dev/null
+++ b/diff-snapshot.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2012 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 v2 as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef __SNAPSHOT_DIFF_
+#define __SNAPSHOT_DIFF_
+
+#define SNAPSHOT_DIFF_LIST_NEW_ITEM	(1 << 0)
+#define SNAPSHOT_DIFF_LIST_REMOVED_ITEM	(1 << 1)
+#define SNAPSHOT_DIFF_LIST_UPDATED_ITEM	(1 << 2)
+#define SNAPSHOT_DIFF_LIST_ALL		(1 << 3)
+
+#define SNAPSHOT_DIFF_SHOW_NEW_ITEM(flags)		\
+	((flags & SNAPSHOT_DIFF_LIST_NEW_ITEM) ||		\
+	 (flags & SNAPSHOT_DIFF_LIST_ALL))
+
+#define SNAPSHOT_DIFF_SHOW_REMOVED_ITEM(flags)		\
+	((flags & SNAPSHOT_DIFF_LIST_REMOVED_ITEM) ||	\
+	 (flags & SNAPSHOT_DIFF_LIST_ALL))
+
+#define SNAPSHOT_DIFF_SHOW_UPDATED_ITEM(flags)		\
+	((flags & SNAPSHOT_DIFF_LIST_UPDATED_ITEM) ||	\
+	 (flags & SNAPSHOT_DIFF_LIST_ALL))
+
+enum {
+	SNAPSHOT_DIFF_NEW_ITEM = 0,
+	SNAPSHOT_DIFF_REMOVED_ITEM,
+	SNAPSHOT_DIFF_UPDATED_ITEM,
+};
+
+int snapshot_diff(int src_fd, int dst_fd, const char *src_snapshot,
+		  const char *dest_snapshot, unsigned int diff_flags);
+#endif
-- 
1.7.4.1