2 * QNX4 file system, Linux implementation.
6 * Using parts of the xiafs filesystem.
10 * 28-05-1998 by Richard Frowijn : first release.
11 * 20-06-1998 by Frank Denis : basic optimisations.
12 * 25-06-1998 by Frank Denis : qnx4_is_free, qnx4_set_bitmap, qnx4_bmap .
13 * 28-06-1998 by Frank Denis : qnx4_free_inode (to be fixed) .
16 #include <linux/buffer_head.h>
17 #include <linux/bitops.h>
20 static void count_bits(register const char *bmPart
, register int size
,
26 if (size
> QNX4_BLOCK_SIZE
) {
27 size
= QNX4_BLOCK_SIZE
;
52 unsigned long qnx4_count_free_blocks(struct super_block
*sb
)
54 int start
= le32_to_cpu(qnx4_sb(sb
)->BitMap
->di_first_xtnt
.xtnt_blk
) - 1;
58 int size
= le32_to_cpu(qnx4_sb(sb
)->BitMap
->di_size
);
59 struct buffer_head
*bh
;
61 while (total
< size
) {
62 if ((bh
= sb_bread(sb
, start
+ offset
)) == NULL
) {
63 printk(KERN_ERR
"qnx4: I/O error in counting free blocks\n");
66 count_bits(bh
->b_data
, size
- total
, &total_free
);
68 total
+= QNX4_BLOCK_SIZE
;