1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/affs/symlink.c
4 *
5 * 1995 Hans-Joachim Widmaier - Modified for affs.
6 *
7 * Copyright (C) 1991, 1992 Linus Torvalds
8 *
9 * affs symlink handling code
10 */
11
12 #include "affs.h"
13
affs_symlink_read_folio(struct file * file,struct folio * folio)14 static int affs_symlink_read_folio(struct file *file, struct folio *folio)
15 {
16 struct page *page = &folio->page;
17 struct buffer_head *bh;
18 struct inode *inode = page->mapping->host;
19 char *link = page_address(page);
20 struct slink_front *lf;
21 int i, j;
22 char c;
23 char lc;
24
25 pr_debug("get_link(ino=%lu)\n", inode->i_ino);
26
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 unlock_page(page);
63 return 0;
64 fail:
65 SetPageError(page);
66 unlock_page(page);
67 return -EIO;
68 }
69
70 const struct address_space_operations affs_symlink_aops = {
71 .read_folio = affs_symlink_read_folio,
72 };
73
74 const struct inode_operations affs_symlink_inode_operations = {
75 .get_link = page_get_link,
76 .setattr = affs_notify_change,
77 };
78