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authorMiao Xie <miaox@cn.fujitsu.com>2012-09-13 04:51:36 -0600
committerJosef Bacik <jbacik@fusionio.com>2012-12-11 13:31:30 -0500
commit3fed40cc97f32bebfd34a55364de9b44dcbede59 (patch)
treee0e991e2d7ff5643c07f2b63395c0d9e744596ba /fs/btrfs/math.h
parent29594404d7fe73cd80eaa4ee8c43dcc53970c60e (diff)
Btrfs: cleanup duplicated division functions
div_factor{_fine} has been implemented for two times, cleanup it. And I move them into a independent file named math.h because they are common math functions. Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs/btrfs/math.h')
-rw-r--r--fs/btrfs/math.h44
1 files changed, 44 insertions, 0 deletions
diff --git a/fs/btrfs/math.h b/fs/btrfs/math.h
new file mode 100644
index 000000000000..b7816cefbd13
--- /dev/null
+++ b/fs/btrfs/math.h
@@ -0,0 +1,44 @@
+
+/*
+ * Copyright (C) 2012 Fujitsu. All rights reserved.
+ * Written by Miao Xie <miaox@cn.fujitsu.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.
+ *
+ * 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 __BTRFS_MATH_H
+#define __BTRFS_MATH_H
+
+#include <asm/div64.h>
+
+static inline u64 div_factor(u64 num, int factor)
+{
+ if (factor == 10)
+ return num;
+ num *= factor;
+ do_div(num, 10);
+ return num;
+}
+
+static inline u64 div_factor_fine(u64 num, int factor)
+{
+ if (factor == 100)
+ return num;
+ num *= factor;
+ do_div(num, 100);
+ return num;
+}
+
+#endif