From bc31b86a5923fad5f3fbb6192f767f410241ba27 Mon Sep 17 00:00:00 2001
From: Wu Fengguang <fengguang.wu@intel.com>
Date: Sat, 7 Jan 2012 20:41:55 -0600
Subject: writeback: move MIN_WRITEBACK_PAGES to fs-writeback.c
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Fix compile error

 fs/fs-writeback.c:515:33: error: ‘PAGE_CACHE_SHIFT’ undeclared (first use in this function)

Reported-by: Randy Dunlap <rdunlap@xenotime.net>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
---
 fs/fs-writeback.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'fs/fs-writeback.c')

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 92d353e069dc..22e2d42742a9 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -20,6 +20,7 @@
 #include <linux/sched.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
+#include <linux/pagemap.h>
 #include <linux/kthread.h>
 #include <linux/freezer.h>
 #include <linux/writeback.h>
@@ -29,6 +30,11 @@
 #include <linux/tracepoint.h>
 #include "internal.h"
 
+/*
+ * 4MB minimal write chunk size
+ */
+#define MIN_WRITEBACK_PAGES	(4096UL >> (PAGE_CACHE_SHIFT - 10))
+
 /*
  * Passed into wb_writeback(), essentially a subset of writeback_control
  */
-- 
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