Btrfs-progs: cleanup duplicated division functions

div_factor 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.

[Eric Sandeen: port kernel commit 3fed40c to userspace]

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

1 files changed, 1 insertions, 8 deletions

diff --git a/volumes.c b/volumes.c
index 0ff22833..10fdc487 100644
--- a/volumes.c
+++ b/volumes.c
@@ -29,6 +29,7 @@
 #include "transaction.h"
 #include "print-tree.h"
 #include "volumes.h"
+#include "math.h"
 
 struct stripe {
 	struct btrfs_device *dev;
@@ -630,14 +631,6 @@ int btrfs_add_system_chunk(struct btrfs_trans_handle *trans,
 	return 0;
 }
 
-static u64 div_factor(u64 num, int factor)
-{
-	if (factor == 10)
-		return num;
-	num *= factor;
-	return num / 10;
-}
-
 static u64 chunk_bytes_by_type(u64 type, u64 calc_size, int num_stripes,
 			       int sub_stripes)
 {