| // SPDX-License-Identifier: GPL-2.0 |
| * QNX4 file system, Linux implementation. |
| * Using parts of the xiafs filesystem. |
| * 28-05-1998 by Richard Frowijn : first release. |
| * 20-06-1998 by Frank Denis : basic optimisations. |
| * 25-06-1998 by Frank Denis : qnx4_is_free, qnx4_set_bitmap, qnx4_bmap . |
| * 28-06-1998 by Frank Denis : qnx4_free_inode (to be fixed) . |
| #include <linux/buffer_head.h> |
| #include <linux/bitops.h> |
| unsigned long qnx4_count_free_blocks(struct super_block *sb) |
| int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1; |
| int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size); |
| int bytes = min(size - total, QNX4_BLOCK_SIZE); |
| if ((bh = sb_bread(sb, start + offset)) == NULL) { |
| printk(KERN_ERR "qnx4: I/O error in counting free blocks\n"); |
| total_free += bytes * BITS_PER_BYTE - |
| memweight(bh->b_data, bytes); |