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>
21 int qnx4_new_block(struct super_block *sb)
27 static void count_bits(register const char *bmPart, register int size,
33 if (size > QNX4_BLOCK_SIZE) {
34 size = QNX4_BLOCK_SIZE;
59 unsigned long qnx4_count_free_blocks(struct super_block *sb)
61 int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
65 int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
66 struct buffer_head *bh;
68 while (total < size) {
69 if ((bh = sb_bread(sb, start + offset)) == NULL) {
70 printk("qnx4: I/O error in counting free blocks\n");
73 count_bits(bh->b_data, size - total, &total_free);
75 total += QNX4_BLOCK_SIZE;
82 #ifdef CONFIG_QNX4FS_RW
84 int qnx4_is_free(struct super_block *sb, long block)
86 int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
87 int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
88 struct buffer_head *bh;
92 start += block / (QNX4_BLOCK_SIZE * 8);
93 QNX4DEBUG(("qnx4: is_free requesting block [%lu], bitmap in block [%lu]\n",
94 (unsigned long) block, (unsigned long) start));
95 (void) size; /* CHECKME */
96 bh = sb_bread(sb, start);
100 g = bh->b_data + (block % QNX4_BLOCK_SIZE);
101 if (((*g) & (1 << (block % 8))) == 0) {
102 QNX4DEBUG(("qnx4: is_free -> block is free\n"));
105 QNX4DEBUG(("qnx4: is_free -> block is busy\n"));
113 int qnx4_set_bitmap(struct super_block *sb, long block, int busy)
115 int start = le32_to_cpu(qnx4_sb(sb)->BitMap->di_first_xtnt.xtnt_blk) - 1;
116 int size = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size);
117 struct buffer_head *bh;
120 start += block / (QNX4_BLOCK_SIZE * 8);
121 QNX4DEBUG(("qnx4: set_bitmap requesting block [%lu], bitmap in block [%lu]\n",
122 (unsigned long) block, (unsigned long) start));
123 (void) size; /* CHECKME */
124 bh = sb_bread(sb, start);
128 g = bh->b_data + (block % QNX4_BLOCK_SIZE);
130 (*g) &= ~(1 << (block % 8));
132 (*g) |= (1 << (block % 8));
134 mark_buffer_dirty(bh);
140 static void qnx4_clear_inode(struct inode *inode)
142 struct qnx4_inode_entry *qnx4_ino = qnx4_raw_inode(inode);
144 memset(qnx4_ino->di_fname, 0, sizeof qnx4_ino->di_fname);
145 qnx4_ino->di_size = 0;
146 qnx4_ino->di_num_xtnts = 0;
147 qnx4_ino->di_mode = 0;
148 qnx4_ino->di_status = 0;
151 void qnx4_free_inode(struct inode *inode)
153 if (inode->i_ino < 1) {
154 printk("free_inode: inode 0 or nonexistent inode\n");
157 qnx4_clear_inode(inode);