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 | |
14 | static 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(sb: inode->i_sb, block: 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(sb: inode->i_sb); |
36 | char *pf; |
37 | spin_lock(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(lock: &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; |
63 | fail: |
64 | folio_unlock(folio); |
65 | return -EIO; |
66 | } |
67 | |
68 | const struct address_space_operations affs_symlink_aops = { |
69 | .read_folio = affs_symlink_read_folio, |
70 | }; |
71 | |
72 | const struct inode_operations affs_symlink_inode_operations = { |
73 | .get_link = page_get_link, |
74 | .setattr = affs_notify_change, |
75 | }; |
76 |