blob: 86cc39cb1398da3a2af03b5c2389ee098f5e5c57 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/smp_lock.h>
15#include <linux/buffer_head.h>
Al Viro964f5362009-06-07 09:47:13 -040016#include "qnx4.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
18static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
19{
Josef Sipek24e23c242006-12-08 02:37:32 -080020 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 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(("qnx4_readdir:i_size = %ld\n", (long) inode->i_size));
30 QNX4DEBUG(("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(("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;
Alexey Dobriyan75043cb2005-06-24 20:52:52 +000058 ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 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
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080078const struct file_operations qnx4_dir_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070079{
80 .read = generic_read_dir,
81 .readdir = qnx4_readdir,
Al Viro79d25762009-06-07 09:30:08 -040082 .fsync = simple_fsync,
Linus Torvalds1da177e2005-04-16 15:20:36 -070083};
84
Arjan van de Venc5ef1c42007-02-12 00:55:40 -080085const struct inode_operations qnx4_dir_inode_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
87 .lookup = qnx4_lookup,
Linus Torvalds1da177e2005-04-16 15:20:36 -070088};