[mirror_ubuntu-artful-kernel.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 = page_address(page);
	struct slink_front *lf;
	int			 i, j;
	char			 c;
	char			 lc;

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

	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);
	unlock_page(page);
	return 0;
fail:
	SetPageError(page);
	unlock_page(page);
	return -EIO;
}

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

const struct inode_operations affs_symlink_inode_operations = {
	.get_link	= page_get_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;
21fc61c7	17	char *link = page_address(page);
1da177e4	18	struct slink_front *lf;
1da177e4 LT	19	int i, j;
	20	char c;
	21	char lc;
1da177e4	22
6b255391	23	pr_debug("get_link(ino=%lu)\n", inode->i_ino);
1da177e4	24
1da177e4 LT	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;
1da177e4 LT	32
1da177e4 LT	33	if (strchr(lf->symname,':')) { /* Handle assign or volume name */
29333920 AV	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 : "/";
1da177e4 LT	38	while (i < 1023 && (c = pf[i]))
1da177e4 LT	39	link[i++] = c;
29333920	40	spin_unlock(&sbi->symlink_lock);
1da177e4 LT	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);
1da177e4 LT	60	unlock_page(page);
	61	return 0;
	62	fail:
	63	SetPageError(page);
1da177e4	64	unlock_page(page);
196a4f82	65	return -EIO;
1da177e4 LT	66	}
1da177e4 LT	67
f5e54d6e	68	const struct address_space_operations affs_symlink_aops = {
1da177e4 LT	69	.readpage = affs_symlink_readpage,
	70	};
	71
754661f1	72	const struct inode_operations affs_symlink_inode_operations = {
6b255391	73	.get_link = page_get_link,
1da177e4 LT	74	.setattr = affs_notify_change,
1da177e4 LT	75	};