Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/fs/affs/symlink.c
15112 views
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


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 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;

65
fail:

66
	SetPageError(page);

67
	kunmap(page);

68
	unlock_page(page);

69
	return err;

70
}

71


72
const struct address_space_operations affs_symlink_aops = {

73
	.readpage	= affs_symlink_readpage,

74
};

75


76
const 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
};

82


83