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/config.h>
15#include <linux/string.h>
16#include <linux/errno.h>
17#include <linux/fs.h>
18#include <linux/qnx4_fs.h>
19#include <linux/stat.h>
20
21#include <asm/segment.h>
22
23static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
24{
25	struct inode *inode = filp->f_dentry->d_inode;
26	unsigned int offset;
27	struct buffer_head *bh;
28	struct qnx4_inode_entry *de;
29	struct qnx4_link_info *le;
30	unsigned long blknum;
31	int ix, ino;
32	int size;
33
34	QNX4DEBUG(("qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
35	QNX4DEBUG(("filp->f_pos         = %ld\n", (long) filp->f_pos));
36
37	while (filp->f_pos < inode->i_size) {
38		blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS );
39		bh = sb_bread(inode->i_sb, blknum);
40		if(bh==NULL) {
41			printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
42			break;
43		}
44		ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
45		while (ix < QNX4_INODES_PER_BLOCK) {
46			offset = ix * QNX4_DIR_ENTRY_SIZE;
47			de = (struct qnx4_inode_entry *) (bh->b_data + offset);
48			size = strlen(de->di_fname);
49			if (size) {
50				if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX )
51					size = QNX4_SHORT_NAME_MAX;
52				else if ( size > QNX4_NAME_MAX )
53					size = QNX4_NAME_MAX;
54
55				if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) {
56					QNX4DEBUG(("qnx4_readdir:%.*s\n", size, de->di_fname));
57					if ( ( de->di_status & QNX4_FILE_LINK ) == 0 )
58						ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
59					else {
60						le  = (struct qnx4_link_info*)de;
61						ino = ( le->dl_inode_blk - 1 ) *
62							QNX4_INODES_PER_BLOCK +
63							le->dl_inode_ndx;
64					}
65					if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) {
66						brelse(bh);
67						return 0;
68					}
69				}
70			}
71			ix++;
72			filp->f_pos += QNX4_DIR_ENTRY_SIZE;
73		}
74		brelse(bh);
75	}
76	UPDATE_ATIME(inode);
77
78	return 0;
79}
80
81struct file_operations qnx4_dir_operations =
82{
83	read:		generic_read_dir,
84	readdir:	qnx4_readdir,
85	fsync:		file_fsync,
86};
87
88struct inode_operations qnx4_dir_inode_operations =
89{
90	lookup:		qnx4_lookup,
91#ifdef CONFIG_QNX4FS_RW
92	create:		qnx4_create,
93	unlink:		qnx4_unlink,
94	rmdir:		qnx4_rmdir,
95#endif
96};
97