1/*
2 *  linux/cluster/ssi/cfs/symlink.c
3 *
4 *	This program is free software; you can redistribute it and/or
5 *	modify it under the terms of the GNU General Public License as
6 *	published by the Free Software Foundation; either version 2 of
7 *	the License, or (at your option) any later version.
8 *
9 *	This program is distributed in the hope that it will be useful,
10 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
11 *	MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE
12 *	or NON INFRINGEMENT.  See the GNU General Public License for more
13 *	details.
14 *
15 * 	You should have received a copy of the GNU General Public License
16 * 	along with this program; if not, write to the Free Software
17 * 	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 *
19 *	Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net
20 *
21 *  Copyright (C) 1992  Rick Sladkey
22 *
23 *  Optimization changes Copyright (C) 1994 Florian La Roche
24 *
25 *  Jun 7 1999, cache symlink lookups in the page cache.  -DaveM
26 *
27 *  Portions Copyright (C) 2001 Compaq Computer Corporation
28 *
29 *  ocfs2 symlink handling code.
30 *
31 *  Copyright (C) 2004, 2005 Oracle.
32 *
33 */
34
35#include <linux/fs.h>
36#include <linux/types.h>
37#include <linux/slab.h>
38#include <linux/pagemap.h>
39#include <linux/namei.h>
40
41#include <cluster/masklog.h>
42
43#include "ocfs2.h"
44
45#include "alloc.h"
46#include "file.h"
47#include "inode.h"
48#include "journal.h"
49#include "symlink.h"
50#include "xattr.h"
51
52#include "buffer_head_io.h"
53
54
55static int ocfs2_fast_symlink_read_folio(struct file *f, struct folio *folio)
56{
57	struct page *page = &folio->page;
58	struct inode *inode = page->mapping->host;
59	struct buffer_head *bh = NULL;
60	int status = ocfs2_read_inode_block(inode, &bh);
61	struct ocfs2_dinode *fe;
62	const char *link;
63	void *kaddr;
64	size_t len;
65
66	if (status < 0) {
67		mlog_errno(status);
68		return status;
69	}
70
71	fe = (struct ocfs2_dinode *) bh->b_data;
72	link = (char *) fe->id2.i_symlink;
73	/* will be less than a page size */
74	len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
75	kaddr = kmap_atomic(page);
76	memcpy(kaddr, link, len + 1);
77	kunmap_atomic(kaddr);
78	SetPageUptodate(page);
79	unlock_page(page);
80	brelse(bh);
81	return 0;
82}
83
84const struct address_space_operations ocfs2_fast_symlink_aops = {
85	.read_folio		= ocfs2_fast_symlink_read_folio,
86};
87
88const struct inode_operations ocfs2_symlink_inode_operations = {
89	.get_link	= page_get_link,
90	.getattr	= ocfs2_getattr,
91	.setattr	= ocfs2_setattr,
92	.listxattr	= ocfs2_listxattr,
93	.fiemap		= ocfs2_fiemap,
94};
95