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
23 static 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 = bread(inode->i_dev, blknum, QNX4_BLOCK_SIZE);
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
81 struct file_operations qnx4_dir_operations =
82 {
83 read: generic_read_dir,
84 readdir: qnx4_readdir,
85 fsync: file_fsync,
86 };
87
88 struct 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
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