1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 *  linux/cluster/ssi/cfs/symlink.c
5 *
6 *	This program is free software; you can redistribute it and/or
7 *	modify it under the terms of the GNU General Public License as
8 *	published by the Free Software Foundation; either version 2 of
9 *	the License, or (at your option) any later version.
10 *
11 *	This program is distributed in the hope that it will be useful,
12 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
13 *	MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE
14 *	or NON INFRINGEMENT.  See the GNU General Public License for more
15 *	details.
16 *
17 * 	You should have received a copy of the GNU General Public License
18 * 	along with this program; if not, write to the Free Software
19 * 	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 *
21 *	Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net
22 *
23 *  Copyright (C) 1992  Rick Sladkey
24 *
25 *  Optimization changes Copyright (C) 1994 Florian La Roche
26 *
27 *  Jun 7 1999, cache symlink lookups in the page cache.  -DaveM
28 *
29 *  Portions Copyright (C) 2001 Compaq Computer Corporation
30 *
31 *  ocfs2 symlink handling code.
32 *
33 *  Copyright (C) 2004, 2005 Oracle.
34 *
35 */
36
37#include <linux/fs.h>
38#include <linux/types.h>
39#include <linux/slab.h>
40#include <linux/pagemap.h>
41#include <linux/namei.h>
42
43#include <cluster/masklog.h>
44
45#include "ocfs2.h"
46
47#include "alloc.h"
48#include "file.h"
49#include "inode.h"
50#include "journal.h"
51#include "symlink.h"
52#include "xattr.h"
53
54#include "buffer_head_io.h"
55
56
57static int ocfs2_fast_symlink_readpage(struct file *unused, struct page *page)
58{
59	struct inode *inode = page->mapping->host;
60	struct buffer_head *bh = NULL;
61	int status = ocfs2_read_inode_block(inode, &bh);
62	struct ocfs2_dinode *fe;
63	const char *link;
64	void *kaddr;
65	size_t len;
66
67	if (status < 0) {
68		mlog_errno(status);
69		return status;
70	}
71
72	fe = (struct ocfs2_dinode *) bh->b_data;
73	link = (char *) fe->id2.i_symlink;
74	/* will be less than a page size */
75	len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
76	kaddr = kmap_atomic(page);
77	memcpy(kaddr, link, len + 1);
78	kunmap_atomic(kaddr);
79	SetPageUptodate(page);
80	unlock_page(page);
81	brelse(bh);
82	return 0;
83}
84
85const struct address_space_operations ocfs2_fast_symlink_aops = {
86	.readpage		= ocfs2_fast_symlink_readpage,
87};
88
89const struct inode_operations ocfs2_symlink_inode_operations = {
90	.readlink	= generic_readlink,
91	.follow_link	= page_follow_link_light,
92	.put_link	= page_put_link,
93	.getattr	= ocfs2_getattr,
94	.setattr	= ocfs2_setattr,
95	.setxattr	= generic_setxattr,
96	.getxattr	= generic_getxattr,
97	.listxattr	= ocfs2_listxattr,
98	.removexattr	= generic_removexattr,
99	.fiemap		= ocfs2_fiemap,
100};
101