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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_readpage(struct file *file, struct page *page) | |
15 | { | |
16 | struct buffer_head *bh; | |
17 | struct inode *inode = page->mapping->host; | |
18 | char *link = page_address(page); | |
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 | SetPageUptodate(page); | |
61 | unlock_page(page); | |
62 | return 0; | |
63 | fail: | |
64 | SetPageError(page); | |
65 | unlock_page(page); | |
66 | return -EIO; | |
67 | } | |
68 | ||
69 | const struct address_space_operations affs_symlink_aops = { | |
70 | .readpage = affs_symlink_readpage, | |
71 | }; | |
72 | ||
73 | const struct inode_operations affs_symlink_inode_operations = { | |
74 | .get_link = page_get_link, | |
75 | .setattr = affs_notify_change, | |
76 | }; |