xref: /openbmc/linux/fs/qnx4/dir.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
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 };
100