1/*
2 * QNX4 file system, Linux implementation.
3 *
4 * Version : 0.2.1
5 *
6 * Using parts of the xiafs filesystem.
7 *
8 * History :
9 *
10 * 28-05-1998 by Richard Frowijn : first release.
11 * 20-06-1998 by Frank Denis : Linux 2.1.99+ & dcache support.
12 */
13
14#include <linux/smp_lock.h>
15#include <linux/buffer_head.h>
16#include "qnx4.h"
17
18static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
19{
20	struct inode *inode = filp->f_path.dentry->d_inode;
21	unsigned int offset;
22	struct buffer_head *bh;
23	struct qnx4_inode_entry *de;
24	struct qnx4_link_info *le;
25	unsigned long blknum;
26	int ix, ino;
27	int size;
28
29	QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
30	QNX4DEBUG((KERN_INFO "filp->f_pos         = %ld\n", (long) filp->f_pos));
31
32	lock_kernel();
33
34	while (filp->f_pos < inode->i_size) {
35		blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS );
36		bh = sb_bread(inode->i_sb, blknum);
37		if(bh==NULL) {
38			printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
39			break;
40		}
41		ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
42		while (ix < QNX4_INODES_PER_BLOCK) {
43			offset = ix * QNX4_DIR_ENTRY_SIZE;
44			de = (struct qnx4_inode_entry *) (bh->b_data + offset);
45			size = strlen(de->di_fname);
46			if (size) {
47				if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX )
48					size = QNX4_SHORT_NAME_MAX;
49				else if ( size > QNX4_NAME_MAX )
50					size = QNX4_NAME_MAX;
51
52				if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) {
53					QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname));
54					if ( ( de->di_status & QNX4_FILE_LINK ) == 0 )
55						ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
56					else {
57						le  = (struct qnx4_link_info*)de;
58						ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
59							QNX4_INODES_PER_BLOCK +
60							le->dl_inode_ndx;
61					}
62					if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) {
63						brelse(bh);
64						goto out;
65					}
66				}
67			}
68			ix++;
69			filp->f_pos += QNX4_DIR_ENTRY_SIZE;
70		}
71		brelse(bh);
72	}
73out:
74	unlock_kernel();
75	return 0;
76}
77
78const struct file_operations qnx4_dir_operations =
79{
80	.llseek		= generic_file_llseek,
81	.read		= generic_read_dir,
82	.readdir	= qnx4_readdir,
83	.fsync		= generic_file_fsync,
84};
85
86const struct inode_operations qnx4_dir_inode_operations =
87{
88	.lookup		= qnx4_lookup,
89};
90