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>

1 files changed, 1 insertions, 18 deletions

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 3d3e2c17d8d..7563db782ab 100644
--- 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
 
@@ -649,24 +650,6 @@ 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)
 {