cd66147cca04c902331f6807b25b6989b8a6b3fb
[linux-3.10.git] / fs / qnx4 / dir.c
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 = ( 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 };