[PATCH v2 1/4] define PAGECACHE_TAG_* as enumeration under include/uapi

[Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>]

We need the pagecache tags to be exported to userspace later in this
series for fincore(2), so this patch moves the definition to the new
include file for preparation. We also use the number of pagecache tags,
so this patch also adds it.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
---
 include/linux/fs.h             |  9 +--------
 include/uapi/linux/pagecache.h | 17 +++++++++++++++++
 2 files changed, 18 insertions(+), 8 deletions(-)
 create mode 100644 include/uapi/linux/pagecache.h

diff --git v3.16-rc3.orig/include/linux/fs.h v3.16-rc3/include/linux/fs.h
index e11d60cc867b..ae4a953bd5f3 100644
--- v3.16-rc3.orig/include/linux/fs.h
+++ v3.16-rc3/include/linux/fs.h
@@ -32,6 +32,7 @@
 
 #include <asm/byteorder.h>
 #include <uapi/linux/fs.h>
+#include <uapi/linux/pagecache.h>
 
 struct export_operations;
 struct hd_geometry;
@@ -446,14 +447,6 @@ struct block_device {
 	struct mutex		bd_fsfreeze_mutex;
 };
 
-/*
- * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
- * radix trees
- */
-#define PAGECACHE_TAG_DIRTY	0
-#define PAGECACHE_TAG_WRITEBACK	1
-#define PAGECACHE_TAG_TOWRITE	2
-
 int mapping_tagged(struct address_space *mapping, int tag);
 
 /*
diff --git v3.16-rc3.orig/include/uapi/linux/pagecache.h v3.16-rc3/include/uapi/linux/pagecache.h
new file mode 100644
index 000000000000..15e879f7395f
--- /dev/null
+++ v3.16-rc3/include/uapi/linux/pagecache.h
@@ -0,0 +1,17 @@
+#ifndef _UAPI_LINUX_PAGECACHE_H
+#define _UAPI_LINUX_PAGECACHE_H
+
+/*
+ * Radix-tree tags, for tagging dirty and writeback pages within the pagecache
+ * radix trees.
+ */
+enum {
+	PAGECACHE_TAG_DIRTY,
+	PAGECACHE_TAG_WRITEBACK,
+	PAGECACHE_TAG_TOWRITE,
+	__NR_PAGECACHE_TAGS,
+};
+
+#define PAGECACHE_TAG_MASK	((1UL << __NR_PAGECACHE_TAGS) - 1)
+
+#endif /* _UAPI_LINUX_PAGECACHE_H */
-- 
1.9.3

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