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
57 static 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
85 const struct address_space_operations ocfs2_fast_symlink_aops = {
86 .readpage = ocfs2_fast_symlink_readpage,
87 };
88
89 const struct inode_operations ocfs2_symlink_inode_operations = {
90 .get_link = page_get_link,
91 .getattr = ocfs2_getattr,
92 .setattr = ocfs2_setattr,
93 .listxattr = ocfs2_listxattr,
94 .fiemap = ocfs2_fiemap,
95 };