[linux.git] / fs / affs / symlink.c

/*
 *  linux/fs/affs/symlink.c
 *
 *  1995  Hans-Joachim Widmaier - Modified for affs.
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 *
 *  affs symlink handling code
 */

#include "affs.h"

static int affs_symlink_readpage(struct file *file, struct page *page)
{
	struct buffer_head *bh;
	struct inode *inode = page->mapping->host;
	char *link = kmap(page);
	struct slink_front *lf;
	int err;
	int			 i, j;
	char			 c;
	char			 lc;

	pr_debug("AFFS: follow_link(ino=%lu)\n",inode->i_ino);

	err = -EIO;
	bh = affs_bread(inode->i_sb, inode->i_ino);
	if (!bh)
		goto fail;
	i  = 0;
	j  = 0;
	lf = (struct slink_front *)bh->b_data;
	lc = 0;

	if (strchr(lf->symname,':')) {	/* Handle assign or volume name */
		struct affs_sb_info *sbi = AFFS_SB(inode->i_sb);
		char *pf;
		spin_lock(&sbi->symlink_lock);
		pf = sbi->s_prefix ? sbi->s_prefix : "/";
		while (i < 1023 && (c = pf[i]))
			link[i++] = c;
		spin_unlock(&sbi->symlink_lock);
		while (i < 1023 && lf->symname[j] != ':')
			link[i++] = lf->symname[j++];
		if (i < 1023)
			link[i++] = '/';
		j++;
		lc = '/';
	}
	while (i < 1023 && (c = lf->symname[j])) {
		if (c == '/' && lc == '/' && i < 1020) {	/* parent dir */
			link[i++] = '.';
			link[i++] = '.';
		}
		link[i++] = c;
		lc = c;
		j++;
	}
	link[i] = '\0';
	affs_brelse(bh);
	SetPageUptodate(page);
	kunmap(page);
	unlock_page(page);
	return 0;
fail:
	SetPageError(page);
	kunmap(page);
	unlock_page(page);
	return err;
}

const struct address_space_operations affs_symlink_aops = {
	.readpage	= affs_symlink_readpage,
};

const struct inode_operations affs_symlink_inode_operations = {
	.readlink	= generic_readlink,
	.follow_link	= page_follow_link_light,
	.put_link	= page_put_link,
	.setattr	= affs_notify_change,
};
Commit	Line	Data
1da177e4 LT	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;
1da177e4 LT	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;
1da177e4 LT	34
1da177e4 LT	35	if (strchr(lf->symname,':')) { /* Handle assign or volume name */
29333920 AV	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 : "/";
1da177e4 LT	40	while (i < 1023 && (c = pf[i]))
1da177e4 LT	41	link[i++] = c;
29333920	42	spin_unlock(&sbi->symlink_lock);
1da177e4 LT	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
f5e54d6e	72	const struct address_space_operations affs_symlink_aops = {
1da177e4 LT	73	.readpage = affs_symlink_readpage,
	74	};
	75
754661f1	76	const struct inode_operations affs_symlink_inode_operations = {
1da177e4 LT	77	.readlink = generic_readlink,
	78	.follow_link = page_follow_link_light,
	79	.put_link = page_put_link,
	80	.setattr = affs_notify_change,
	81	};