1 files changed, 25 insertions, 0 deletions

diff --git a/fs/ext2/bitmap.c b/fs/ext2/bitmap.c
new file mode 100644
index 000000000000..20145b74623f
--- /dev/null
+++ b/fs/ext2/bitmap.c
@@ -0,0 +1,25 @@
+/*
+ *  linux/fs/ext2/bitmap.c
+ *
+ * Copyright (C) 1992, 1993, 1994, 1995
+ * Remy Card (card@masi.ibp.fr)
+ * Laboratoire MASI - Institut Blaise Pascal
+ * Universite Pierre et Marie Curie (Paris VI)
+ */
+
+#include <linux/buffer_head.h>
+
+static int nibblemap[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
+
+unsigned long ext2_count_free (struct buffer_head * map, unsigned int numchars)
+{
+        unsigned int i;
+        unsigned long sum = 0;
+        
+        if (!map) 
+                return (0);
+        for (i = 0; i < numchars; i++)
+                sum += nibblemap[map->b_data[i] & 0xf] +
+                        nibblemap[(map->b_data[i] >> 4) & 0xf];
+        return (sum);
+}