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>

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 0bc83b3f33db9545315f546b2a076e4833b02169..8578cc0eb233eeaf86484805d6beb706298c8a17 100644 (file)
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -33,6 +33,7 @@
 #include "volumes.h"
 #include "locking.h"
 #include "free-space-cache.h"
+#include "math.h"
 
 #undef SCRAMBLE_DELAYED_REFS
 
@@ -648,24 +649,6 @@ void btrfs_clear_space_info_full(struct btrfs_fs_info *info)
        rcu_read_unlock();
 }
 
-static u64 div_factor(u64 num, int factor)
-{
-       if (factor == 10)
-               return num;
-       num *= factor;
-       do_div(num, 10);
-       return num;
-}
-
-static u64 div_factor_fine(u64 num, int factor)
-{
-       if (factor == 100)
-               return num;
-       num *= factor;
-       do_div(num, 100);
-       return num;
-}
-
 u64 btrfs_find_block_group(struct btrfs_root *root,
                           u64 search_start, u64 search_hint, int owner)
 {

diff --git a/fs/btrfs/math.h b/fs/btrfs/math.h
new file mode 100644 (file)
index 0000000..b7816ce
--- /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

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 88b969aeeb71a53128ae941e569ad19f7b1038c3..11d0b2b6057c0eaab4553dccc0d199a0481d926f 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -25,7 +25,6 @@
 #include <linux/capability.h>
 #include <linux/ratelimit.h>
 #include <linux/kthread.h>
-#include <asm/div64.h>
 #include "compat.h"
 #include "ctree.h"
 #include "extent_map.h"
@@ -36,6 +35,7 @@
 #include "async-thread.h"
 #include "check-integrity.h"
 #include "rcu-string.h"
+#include "math.h"
 
 static int init_first_rw_device(struct btrfs_trans_handle *trans,
                                struct btrfs_root *root,
@@ -2321,18 +2321,6 @@ static int chunk_profiles_filter(u64 chunk_type,
        return 1;
 }
 
-static u64 div_factor_fine(u64 num, int factor)
-{
-       if (factor <= 0)
-               return 0;
-       if (factor >= 100)
-               return num;
-
-       num *= factor;
-       do_div(num, 100);
-       return num;
-}
-
 static int chunk_usage_filter(struct btrfs_fs_info *fs_info, u64 chunk_offset,
                              struct btrfs_balance_args *bargs)
 {
@@ -2497,15 +2485,6 @@ static int should_balance_chunk(struct btrfs_root *root,
        return 1;
 }
 
-static u64 div_factor(u64 num, int factor)
-{
-       if (factor == 10)
-               return num;
-       num *= factor;
-       do_div(num, 10);
-       return num;
-}
-
 static int __btrfs_balance(struct btrfs_fs_info *fs_info)
 {
        struct btrfs_balance_control *bctl = fs_info->balance_ctl;