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};

 
 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
13static 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;
65fail:
66	SetPageError(page);
67	kunmap(page);
68	unlock_page(page);
69	return err;
70}
71
72const struct address_space_operations affs_symlink_aops = {
73	.readpage	= affs_symlink_readpage,
74};
75
76const 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};