[RFC 01/11] vfs: introduce one structure hot_info

[zwu.kernel@gmail.com]

From: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>

   One root structure hot_info is defined, is hooked
up in super_block, and will be used to hold rb trees
root, hash list root and some other information, etc.

Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
---
 include/linux/fs.h        |    4 ++++
 include/linux/hot_track.h |   26 ++++++++++++++++++++++++++
 2 files changed, 30 insertions(+), 0 deletions(-)
 create mode 100644 include/linux/hot_track.h

diff --git a/include/linux/fs.h b/include/linux/fs.h
index aa11047..6229895 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -415,6 +415,7 @@ struct inodes_stat_t {
 #include <linux/migrate_mode.h>
 #include <linux/uidgid.h>
 #include <linux/lockdep.h>
+#include <linux/hot_track.h>
 
 #include <asm/byteorder.h>
 
@@ -1578,6 +1579,9 @@ struct super_block {
 
 	/* Being remounted read-only */
 	int s_readonly_remount;
+
+	/* Hot data tracking info*/
+	struct hot_info s_hotinfo;
 };
 
 /* superblock cache pruning functions */
diff --git a/include/linux/hot_track.h b/include/linux/hot_track.h
new file mode 100644
index 0000000..5716b93
--- /dev/null
+++ b/include/linux/hot_track.h
@@ -0,0 +1,26 @@
+/*
+ *  include/linux/hot_track.h
+ *
+ * This file has definitions for VFS hot data tracking
+ * structures etc.
+ *
+ * Copyright (C) 2012 IBM Corp. All rights reserved.
+ * Written by Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
+ *            Ben Chociej <bchociej@gmail.com>
+ *
+ * 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.
+ */
+
+#ifndef _LINUX_HOTTRACK_H
+#define _LINUX_HOTTRACK_H
+
+#include <linux/types.h>
+#include <linux/rbtree.h>
+#include <linux/kref.h>
+
+struct hot_info {
+};
+
+#endif  /* _LINUX_HOTTRACK_H */
-- 
1.7.6.5