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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  
affs_symlink_readpage(struct file * file,struct page * page)13  static 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			 i, j;
20  	char			 c;
21  	char			 lc;
22  
23  	pr_debug("follow_link(ino=%lu)\n", inode->i_ino);
24  
25  	bh = affs_bread(inode->i_sb, inode->i_ino);
26  	if (!bh)
27  		goto fail;
28  	i  = 0;
29  	j  = 0;
30  	lf = (struct slink_front *)bh->b_data;
31  	lc = 0;
32  
33  	if (strchr(lf->symname,':')) {	/* Handle assign or volume name */
34  		struct affs_sb_info *sbi = AFFS_SB(inode->i_sb);
35  		char *pf;
36  		spin_lock(&sbi->symlink_lock);
37  		pf = sbi->s_prefix ? sbi->s_prefix : "/";
38  		while (i < 1023 && (c = pf[i]))
39  			link[i++] = c;
40  		spin_unlock(&sbi->symlink_lock);
41  		while (i < 1023 && lf->symname[j] != ':')
42  			link[i++] = lf->symname[j++];
43  		if (i < 1023)
44  			link[i++] = '/';
45  		j++;
46  		lc = '/';
47  	}
48  	while (i < 1023 && (c = lf->symname[j])) {
49  		if (c == '/' && lc == '/' && i < 1020) {	/* parent dir */
50  			link[i++] = '.';
51  			link[i++] = '.';
52  		}
53  		link[i++] = c;
54  		lc = c;
55  		j++;
56  	}
57  	link[i] = '\0';
58  	affs_brelse(bh);
59  	SetPageUptodate(page);
60  	kunmap(page);
61  	unlock_page(page);
62  	return 0;
63  fail:
64  	SetPageError(page);
65  	kunmap(page);
66  	unlock_page(page);
67  	return -EIO;
68  }
69  
70  const struct address_space_operations affs_symlink_aops = {
71  	.readpage	= affs_symlink_readpage,
72  };
73  
74  const struct inode_operations affs_symlink_inode_operations = {
75  	.readlink	= generic_readlink,
76  	.follow_link	= page_follow_link_light,
77  	.put_link	= page_put_link,
78  	.setattr	= affs_notify_change,
79  };
80