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 "affs.h"
12
affs_symlink_readpage(struct file * file,struct page * page)13 static int affs_symlink_readpage(struct file *file, struct page *page)
14 {
15 struct buffer_head *bh;
16 struct inode *inode = page->mapping->host;
17 char *link = kmap(page);
18 struct slink_front *lf;
19 int i, j;
20 char c;
21 char lc;
22
23 pr_debug("follow_link(ino=%lu)\n", inode->i_ino);
24
25 bh = affs_bread(inode->i_sb, inode->i_ino);
26 if (!bh)
27 goto fail;
28 i = 0;
29 j = 0;
30 lf = (struct slink_front *)bh->b_data;
31 lc = 0;
32
33 if (strchr(lf->symname,':')) { /* Handle assign or volume name */
34 struct affs_sb_info *sbi = AFFS_SB(inode->i_sb);
35 char *pf;
36 spin_lock(&sbi->symlink_lock);
37 pf = sbi->s_prefix ? sbi->s_prefix : "/";
38 while (i < 1023 && (c = pf[i]))
39 link[i++] = c;
40 spin_unlock(&sbi->symlink_lock);
41 while (i < 1023 && lf->symname[j] != ':')
42 link[i++] = lf->symname[j++];
43 if (i < 1023)
44 link[i++] = '/';
45 j++;
46 lc = '/';
47 }
48 while (i < 1023 && (c = lf->symname[j])) {
49 if (c == '/' && lc == '/' && i < 1020) { /* parent dir */
50 link[i++] = '.';
51 link[i++] = '.';
52 }
53 link[i++] = c;
54 lc = c;
55 j++;
56 }
57 link[i] = '\0';
58 affs_brelse(bh);
59 SetPageUptodate(page);
60 kunmap(page);
61 unlock_page(page);
62 return 0;
63 fail:
64 SetPageError(page);
65 kunmap(page);
66 unlock_page(page);
67 return -EIO;
68 }
69
70 const struct address_space_operations affs_symlink_aops = {
71 .readpage = affs_symlink_readpage,
72 };
73
74 const struct inode_operations affs_symlink_inode_operations = {
75 .readlink = generic_readlink,
76 .follow_link = page_follow_link_light,
77 .put_link = page_put_link,
78 .setattr = affs_notify_change,
79 };
80