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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 #include <linux/smp_lock.h>
21 #include <linux/buffer_head.h>
22
23
24 static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
25 {
26 struct inode *inode = filp->f_dentry->d_inode;
27 unsigned int offset;
28 struct buffer_head *bh;
29 struct qnx4_inode_entry *de;
30 struct qnx4_link_info *le;
31 unsigned long blknum;
32 int ix, ino;
33 int size;
34
35 QNX4DEBUG(("qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
36 QNX4DEBUG(("filp->f_pos = %ld\n", (long) filp->f_pos));
37
38 lock_kernel();
39
40 while (filp->f_pos < inode->i_size) {
41 blknum = qnx4_block_map( inode, filp->f_pos >> QNX4_BLOCK_SIZE_BITS );
42 bh = sb_bread(inode->i_sb, blknum);
43 if(bh==NULL) {
44 printk(KERN_ERR "qnx4_readdir: bread failed (%ld)\n", blknum);
45 break;
46 }
47 ix = (int)(filp->f_pos >> QNX4_DIR_ENTRY_SIZE_BITS) % QNX4_INODES_PER_BLOCK;
48 while (ix < QNX4_INODES_PER_BLOCK) {
49 offset = ix * QNX4_DIR_ENTRY_SIZE;
50 de = (struct qnx4_inode_entry *) (bh->b_data + offset);
51 size = strlen(de->di_fname);
52 if (size) {
53 if ( !( de->di_status & QNX4_FILE_LINK ) && size > QNX4_SHORT_NAME_MAX )
54 size = QNX4_SHORT_NAME_MAX;
55 else if ( size > QNX4_NAME_MAX )
56 size = QNX4_NAME_MAX;
57
58 if ( ( de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK) ) != 0 ) {
59 QNX4DEBUG(("qnx4_readdir:%.*s\n", size, de->di_fname));
60 if ( ( de->di_status & QNX4_FILE_LINK ) == 0 )
61 ino = blknum * QNX4_INODES_PER_BLOCK + ix - 1;
62 else {
63 le = (struct qnx4_link_info*)de;
64 ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
65 QNX4_INODES_PER_BLOCK +
66 le->dl_inode_ndx;
67 }
68 if (filldir(dirent, de->di_fname, size, filp->f_pos, ino, DT_UNKNOWN) < 0) {
69 brelse(bh);
70 goto out;
71 }
72 }
73 }
74 ix++;
75 filp->f_pos += QNX4_DIR_ENTRY_SIZE;
76 }
77 brelse(bh);
78 }
79 out:
80 unlock_kernel();
81 return 0;
82 }
83
84 struct file_operations qnx4_dir_operations =
85 {
86 .read = generic_read_dir,
87 .readdir = qnx4_readdir,
88 .fsync = file_fsync,
89 };
90
91 struct inode_operations qnx4_dir_inode_operations =
92 {
93 .lookup = qnx4_lookup,
94 #ifdef CONFIG_QNX4FS_RW
95 .create = qnx4_create,
96 .unlink = qnx4_unlink,
97 .rmdir = qnx4_rmdir,
98 #endif
99 };