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 err;
20 int i, j;
21 char c;
22 char lc;
23
24 pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino);
25
26 err = -EIO;
27 bh = affs_bread(inode->i_sb, inode->i_ino);
28 if (!bh)
29 goto fail;
30 i = 0;
31 j = 0;
32 lf = (struct slink_front *)bh->b_data;
33 lc = 0;
34
35 if (strchr(lf->symname,':')) { /* Handle assign or volume name */
36 struct affs_sb_info *sbi = AFFS_SB(inode->i_sb);
37 char *pf;
38 spin_lock(&sbi->symlink_lock);
39 pf = sbi->s_prefix ? sbi->s_prefix : "/";
40 while (i < 1023 && (c = pf[i]))
41 link[i++] = c;
42 spin_unlock(&sbi->symlink_lock);
43 while (i < 1023 && lf->symname[j] != ':')
44 link[i++] = lf->symname[j++];
45 if (i < 1023)
46 link[i++] = '/';
47 j++;
48 lc = '/';
49 }
50 while (i < 1023 && (c = lf->symname[j])) {
51 if (c == '/' && lc == '/' && i < 1020) { /* parent dir */
52 link[i++] = '.';
53 link[i++] = '.';
54 }
55 link[i++] = c;
56 lc = c;
57 j++;
58 }
59 link[i] = '\0';
60 affs_brelse(bh);
61 SetPageUptodate(page);
62 kunmap(page);
63 unlock_page(page);
64 return 0;
65 fail:
66 SetPageError(page);
67 kunmap(page);
68 unlock_page(page);
69 return err;
70 }
71
72 const struct address_space_operations affs_symlink_aops = {
73 .readpage = affs_symlink_readpage,
74 };
75
76 const struct inode_operations affs_symlink_inode_operations = {
77 .readlink = generic_readlink,
78 .follow_link = page_follow_link_light,
79 .put_link = page_put_link,
80 .setattr = affs_notify_change,
81 };
82