blob: 28ce014b3ceff09e8ad2a2d2cea8716802a1dc5b [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/buffer_head.h>
Al Viro964f5362009-06-07 09:47:13 -040015#include "qnx4.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17static int qnx4_readdir(struct file *filp, void *dirent, filldir_t filldir)
18{
Al Viro496ad9a2013-01-23 17:07:38 -050019 struct inode *inode = file_inode(filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 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
Anders Larsen891ddb92009-09-26 20:15:09 +020028 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));
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 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 ) {
Anders Larsen891ddb92009-09-26 20:15:09 +020050 QNX4DEBUG((KERN_INFO "qnx4_readdir:%.*s\n", size, de->di_fname));
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 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;
Alexey Dobriyan75043cb2005-06-24 20:52:52 +000055 ino = ( le32_to_cpu(le->dl_inode_blk) - 1 ) *
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 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:
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 return 0;
72}
73
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080074const struct file_operations qnx4_dir_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
jan Blunckca572722010-05-26 14:44:53 -070076 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 .read = generic_read_dir,
78 .readdir = qnx4_readdir,
Christoph Hellwig1b061d92010-05-26 17:53:41 +020079 .fsync = generic_file_fsync,
Linus Torvalds1da177e2005-04-16 15:20:36 -070080};
81
Arjan van de Venc5ef1c42007-02-12 00:55:40 -080082const struct inode_operations qnx4_dir_inode_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070083{
84 .lookup = qnx4_lookup,
Linus Torvalds1da177e2005-04-16 15:20:36 -070085};