1 /*
2 * linux/fs/affs/symlink.c
3 *
4 * 1995 Hans-Joachim Widmaier - Modified for affs.
5 *
6 * Copyright (C) 1991, 1992 Linus Torvalds
7 *
8 * affs symlink handling code
9 */
10
11 #include <linux/errno.h>
12 #include <linux/fs.h>
13 #include <linux/stat.h>
14 #include <linux/affs_fs.h>
15 #include <linux/amigaffs.h>
16 #include <linux/pagemap.h>
17 #include <linux/smp_lock.h>
18
19 static int affs_symlink_readpage(struct file *file, struct page *page)
20 {
21 struct buffer_head *bh;
22 struct inode *inode = page->mapping->host;
23 char *link = kmap(page);
24 struct slink_front *lf;
25 int err;
26 int i, j;
27 char c;
28 char lc;
29 char *pf;
30
31 pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino);
32
33 err = -EIO;
34 lock_kernel();
35 bh = affs_bread(inode->i_dev,inode->i_ino,AFFS_I2BSIZE(inode));
36 unlock_kernel();
37 if (!bh)
38 goto fail;
39 i = 0;
40 j = 0;
41 lf = (struct slink_front *)bh->b_data;
42 lc = 0;
43 pf = inode->i_sb->u.affs_sb.s_prefix ? inode->i_sb->u.affs_sb.s_prefix : "/";
44
45 if (strchr(lf->symname,':')) { /* Handle assign or volume name */
46 while (i < 1023 && (c = pf[i]))
47 link[i++] = c;
48 while (i < 1023 && lf->symname[j] != ':')
49 link[i++] = lf->symname[j++];
50 if (i < 1023)
51 link[i++] = '/';
52 j++;
53 lc = '/';
54 }
55 while (i < 1023 && (c = lf->symname[j])) {
56 if (c == '/' && lc == '/' && i < 1020) { /* parent dir */
57 link[i++] = '.';
58 link[i++] = '.';
59 }
60 link[i++] = c;
61 lc = c;
62 j++;
63 }
64 link[i] = '\0';
65 lock_kernel();
66 affs_brelse(bh);
67 unlock_kernel();
68 SetPageUptodate(page);
69 kunmap(page);
70 UnlockPage(page);
71 return 0;
72 fail:
73 SetPageError(page);
74 kunmap(page);
75 UnlockPage(page);
76 return err;
77 }
78
79 struct address_space_operations affs_symlink_aops = {
80 readpage: affs_symlink_readpage,
81 };
82
83 struct inode_operations affs_symlink_inode_operations = {
84 readlink: page_readlink,
85 follow_link: page_follow_link,
86 setattr: affs_notify_change,
87 };
88
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