Root/fs/qnx4/dir.c

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/buffer_head.h>
15#include "qnx4.h"
16
17static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
18{
19    struct inode *inode = filp->f_path.dentry->d_inode;
20    unsigned int offset;
21    struct buffer_head *bh;
22    struct qnx4_inode_entry *de;
23    struct qnx4_link_info *le;
24    unsigned long blknum;
25    int ix, ino;
26    int size;
27
28    QNX4DEBUG((KERN_INFO "qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
29    QNX4DEBUG((KERN_INFO "filp->f_pos = %ld\n", (long) filp->f_pos));
30
31    while (filp->f_pos < inode->i_size) {
32        blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS );
33        bh = sb_bread(inode->i_sb, blknum);
34        if(bh==NULL) {
35            printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
36            break;
37        }
38        ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
39        while (ix < QNX4_INODES_PER_BLOCK) {
40            offset = ix * QNX4_DIR_ENTRY_SIZE;
41            de = (struct qnx4_inode_entry *) (bh->b_data + offset);
42            size = strlen(de->di_fname);
43            if (size) {
44                if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX )
45                    size = QNX4_SHORT_NAME_MAX;
46                else if ( size > QNX4_NAME_MAX )
47                    size = QNX4_NAME_MAX;
48
49                if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) {
50                    QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname));
51                    if ( ( de->di_status & QNX4_FILE_LINK ) == 0 )
52                        ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
53                    else {
54                        le = (struct qnx4_link_info*)de;
55                        ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
56                            QNX4_INODES_PER_BLOCK +
57                            le->dl_inode_ndx;
58                    }
59                    if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) {
60                        brelse(bh);
61                        goto out;
62                    }
63                }
64            }
65            ix++;
66            filp->f_pos += QNX4_DIR_ENTRY_SIZE;
67        }
68        brelse(bh);
69    }
70out:
71    return 0;
72}
73
74const struct file_operations qnx4_dir_operations =
75{
76    .llseek = generic_file_llseek,
77    .read = generic_read_dir,
78    .readdir = qnx4_readdir,
79    .fsync = generic_file_fsync,
80};
81
82const struct inode_operations qnx4_dir_inode_operations =
83{
84    .lookup = qnx4_lookup,
85};
86

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