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/efs_fs.h>
11#include <linux/pagemap.h>
12#include <linux/buffer_head.h>
13#include <linux/smp_lock.h>
14
15static int efs_symlink_readpage(struct file *file, struct page *page)
16{
17	char *link = kmap(page);
18	struct buffer_head * bh;
19	struct inode * inode = page->mapping->host;
20	efs_block_t size = inode->i_size;
21	int err;
22
23	err = -ENAMETOOLONG;
24	if (size > 2 * EFS_BLOCKSIZE)
25		goto fail_notlocked;
26
27	lock_kernel();
28	/* read first 512 bytes of link target */
29	err = -EIO;
30	bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
31	if (!bh)
32		goto fail;
33	memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
34	brelse(bh);
35	if (size > EFS_BLOCKSIZE) {
36		bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
37		if (!bh)
38			goto fail;
39		memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
40		brelse(bh);
41	}
42	link[size] = '\0';
43	unlock_kernel();
44	SetPageUptodate(page);
45	kunmap(page);
46	unlock_page(page);
47	return 0;
48fail:
49	unlock_kernel();
50fail_notlocked:
51	SetPageError(page);
52	kunmap(page);
53	unlock_page(page);
54	return err;
55}
56
57const struct address_space_operations efs_symlink_aops = {
58	.readpage	= efs_symlink_readpage
59};
60