1/*
2 * symlink.c
3 *
4 * Copyright (c) 1999 Al Smith
5 *
6 * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
7 */
8
9#include <linux/string.h>
10#include <linux/pagemap.h>
11#include <linux/buffer_head.h>
12#include "efs.h"
13
14static int efs_symlink_readpage(struct file *file, struct page *page)
15{
16	char *link = kmap(page);
17	struct buffer_head * bh;
18	struct inode * inode = page->mapping->host;
19	efs_block_t size = inode->i_size;
20	int err;
21
22	err = -ENAMETOOLONG;
23	if (size > 2 * EFS_BLOCKSIZE)
24		goto fail;
25
26	/* read first 512 bytes of link target */
27	err = -EIO;
28	bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
29	if (!bh)
30		goto fail;
31	memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
32	brelse(bh);
33	if (size > EFS_BLOCKSIZE) {
34		bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
35		if (!bh)
36			goto fail;
37		memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
38		brelse(bh);
39	}
40	link[size] = '\0';
41	SetPageUptodate(page);
42	kunmap(page);
43	unlock_page(page);
44	return 0;
45fail:
46	SetPageError(page);
47	kunmap(page);
48	unlock_page(page);
49	return err;
50}
51
52const struct address_space_operations efs_symlink_aops = {
53	.readpage	= efs_symlink_readpage
54};
55