2 * linux/fs/ext3/bitmap.c
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
10 #include <linux/buffer_head.h>
11 #include <linux/jbd.h>
12 #include <linux/ext3_fs.h>
16 static const int nibblemap
[] = {4, 3, 3, 2, 3, 2, 2, 1, 3, 2, 2, 1, 2, 1, 1, 0};
18 unsigned long ext3_count_free (struct buffer_head
* map
, unsigned int numchars
)
21 unsigned long sum
= 0;
25 for (i
= 0; i
< numchars
; i
++)
26 sum
+= nibblemap
[map
->b_data
[i
] & 0xf] +
27 nibblemap
[(map
->b_data
[i
] >> 4) & 0xf];
31 #endif /* EXT3FS_DEBUG */
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