This source file includes following definitions.
- ext_dir_read
- ext_readdir
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15 #include <asm/segment.h>
16
17 #include <linux/errno.h>
18 #include <linux/kernel.h>
19 #include <linux/fs.h>
20 #include <linux/ext_fs.h>
21 #include <linux/stat.h>
22
23 static int ext_dir_read(struct inode * inode, struct file * filp, char * buf, int count)
24 {
25 return -EISDIR;
26 }
27
28 static int ext_readdir(struct inode *, struct file *, struct dirent *, int);
29
30 static struct file_operations ext_dir_operations = {
31 NULL,
32 ext_dir_read,
33 NULL,
34 ext_readdir,
35 NULL,
36 NULL,
37 NULL,
38 NULL,
39 NULL
40 };
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44
45 struct inode_operations ext_dir_inode_operations = {
46 &ext_dir_operations,
47 ext_create,
48 ext_lookup,
49 ext_link,
50 ext_unlink,
51 ext_symlink,
52 ext_mkdir,
53 ext_rmdir,
54 ext_mknod,
55 ext_rename,
56 NULL,
57 NULL,
58 NULL,
59 ext_truncate
60 };
61
62 static int ext_readdir(struct inode * inode, struct file * filp,
63 struct dirent * dirent, int count)
64 {
65 unsigned int offset,i;
66 char c;
67 struct buffer_head * bh;
68 struct ext_dir_entry * de;
69
70 if (!inode || !S_ISDIR(inode->i_mode))
71 return -EBADF;
72 if (filp->f_pos % 8 != 0)
73 return -EBADF;
74 while (filp->f_pos < inode->i_size) {
75 offset = filp->f_pos & 1023;
76 bh = ext_bread(inode,(filp->f_pos)>>BLOCK_SIZE_BITS,0);
77 if (!bh) {
78 filp->f_pos += 1024-offset;
79 continue;
80 }
81 de = (struct ext_dir_entry *) (offset + bh->b_data);
82 while (offset < 1024 && filp->f_pos < inode->i_size) {
83 if (de->rec_len < 8 || de->rec_len % 8 != 0 ||
84 de->rec_len < de->name_len + 8 ||
85 (de->rec_len + filp->f_pos - 1) / 1024 > (filp->f_pos / 1024)) {
86 printk ("ext_readdir: bad dir entry, skipping\n");
87 printk ("dev=%d, dir=%d, offset=%d, rec_len=%d, name_len=%d\n",
88 inode->i_dev, inode->i_ino, offset, de->rec_len, de->name_len);
89 filp->f_pos += 1024-offset;
90 if (filp->f_pos > inode->i_size)
91 filp->f_pos = inode->i_size;
92 continue;
93 }
94 offset += de->rec_len;
95 filp->f_pos += de->rec_len;
96 if (de->inode) {
97 for (i = 0; i < de->name_len; i++)
98 if ((c = de->name[i]) != 0)
99 put_fs_byte(c,i+dirent->d_name);
100 else
101 break;
102 if (i) {
103 put_fs_long(de->inode,&dirent->d_ino);
104 put_fs_byte(0,i+dirent->d_name);
105 put_fs_word(i,&dirent->d_reclen);
106 brelse(bh);
107 return i;
108 }
109 }
110 de = (struct ext_dir_entry *) ((char *) de
111 + de->rec_len);
112 }
113 brelse(bh);
114 }
115 return 0;
116 }