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