blob: a7531b26e8f0297509eae83cd7624282cb83f152 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001// SPDX-License-Identifier: GPL-2.0
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
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_readpage(struct file *file, struct page *page)
15{
16 struct buffer_head *bh;
17 struct inode *inode = page->mapping->host;
Al Viro21fc61c2015-11-17 01:07:57 -050018 char *link = page_address(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 struct slink_front *lf;
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 int i, j;
21 char c;
22 char lc;
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
Al Viro6b255392015-11-17 10:20:54 -050024 pr_debug("get_link(ino=%lu)\n", inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Linus Torvalds1da177e2005-04-16 15:20:36 -070026 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070033
34 if (strchr(lf->symname,':')) { /* Handle assign or volume name */
Al Viro29333922010-01-24 00:04:07 -050035 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 : "/";
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 while (i < 1023 && (c = pf[i]))
40 link[i++] = c;
Al Viro29333922010-01-24 00:04:07 -050041 spin_unlock(&sbi->symlink_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 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 SetPageUptodate(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 unlock_page(page);
62 return 0;
63fail:
64 SetPageError(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 unlock_page(page);
Fabian Frederick196a4f82015-06-30 14:58:01 -070066 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067}
68
Christoph Hellwigf5e54d62006-06-28 04:26:44 -070069const struct address_space_operations affs_symlink_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 .readpage = affs_symlink_readpage,
71};
72
Arjan van de Ven754661f2007-02-12 00:55:38 -080073const struct inode_operations affs_symlink_inode_operations = {
Al Viro6b255392015-11-17 10:20:54 -050074 .get_link = page_get_link,
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 .setattr = affs_notify_change,
76};