1*4882a593Smuzhiyun /* -*- mode: c; c-basic-offset: 8; -*-
2*4882a593Smuzhiyun * vim: noexpandtab sw=8 ts=8 sts=0:
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * linux/cluster/ssi/cfs/symlink.c
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * This program is free software; you can redistribute it and/or
7*4882a593Smuzhiyun * modify it under the terms of the GNU General Public License as
8*4882a593Smuzhiyun * published by the Free Software Foundation; either version 2 of
9*4882a593Smuzhiyun * the License, or (at your option) any later version.
10*4882a593Smuzhiyun *
11*4882a593Smuzhiyun * This program is distributed in the hope that it will be useful,
12*4882a593Smuzhiyun * but WITHOUT ANY WARRANTY; without even the implied warranty of
13*4882a593Smuzhiyun * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE
14*4882a593Smuzhiyun * or NON INFRINGEMENT. See the GNU General Public License for more
15*4882a593Smuzhiyun * details.
16*4882a593Smuzhiyun *
17*4882a593Smuzhiyun * You should have received a copy of the GNU General Public License
18*4882a593Smuzhiyun * along with this program; if not, write to the Free Software
19*4882a593Smuzhiyun * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20*4882a593Smuzhiyun *
21*4882a593Smuzhiyun * Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net
22*4882a593Smuzhiyun *
23*4882a593Smuzhiyun * Copyright (C) 1992 Rick Sladkey
24*4882a593Smuzhiyun *
25*4882a593Smuzhiyun * Optimization changes Copyright (C) 1994 Florian La Roche
26*4882a593Smuzhiyun *
27*4882a593Smuzhiyun * Jun 7 1999, cache symlink lookups in the page cache. -DaveM
28*4882a593Smuzhiyun *
29*4882a593Smuzhiyun * Portions Copyright (C) 2001 Compaq Computer Corporation
30*4882a593Smuzhiyun *
31*4882a593Smuzhiyun * ocfs2 symlink handling code.
32*4882a593Smuzhiyun *
33*4882a593Smuzhiyun * Copyright (C) 2004, 2005 Oracle.
34*4882a593Smuzhiyun *
35*4882a593Smuzhiyun */
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun #include <linux/fs.h>
38*4882a593Smuzhiyun #include <linux/types.h>
39*4882a593Smuzhiyun #include <linux/slab.h>
40*4882a593Smuzhiyun #include <linux/pagemap.h>
41*4882a593Smuzhiyun #include <linux/namei.h>
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun #include <cluster/masklog.h>
44*4882a593Smuzhiyun
45*4882a593Smuzhiyun #include "ocfs2.h"
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun #include "alloc.h"
48*4882a593Smuzhiyun #include "file.h"
49*4882a593Smuzhiyun #include "inode.h"
50*4882a593Smuzhiyun #include "journal.h"
51*4882a593Smuzhiyun #include "symlink.h"
52*4882a593Smuzhiyun #include "xattr.h"
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun #include "buffer_head_io.h"
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun
ocfs2_fast_symlink_readpage(struct file * unused,struct page * page)57*4882a593Smuzhiyun static int ocfs2_fast_symlink_readpage(struct file *unused, struct page *page)
58*4882a593Smuzhiyun {
59*4882a593Smuzhiyun struct inode *inode = page->mapping->host;
60*4882a593Smuzhiyun struct buffer_head *bh = NULL;
61*4882a593Smuzhiyun int status = ocfs2_read_inode_block(inode, &bh);
62*4882a593Smuzhiyun struct ocfs2_dinode *fe;
63*4882a593Smuzhiyun const char *link;
64*4882a593Smuzhiyun void *kaddr;
65*4882a593Smuzhiyun size_t len;
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun if (status < 0) {
68*4882a593Smuzhiyun mlog_errno(status);
69*4882a593Smuzhiyun return status;
70*4882a593Smuzhiyun }
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun fe = (struct ocfs2_dinode *) bh->b_data;
73*4882a593Smuzhiyun link = (char *) fe->id2.i_symlink;
74*4882a593Smuzhiyun /* will be less than a page size */
75*4882a593Smuzhiyun len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
76*4882a593Smuzhiyun kaddr = kmap_atomic(page);
77*4882a593Smuzhiyun memcpy(kaddr, link, len + 1);
78*4882a593Smuzhiyun kunmap_atomic(kaddr);
79*4882a593Smuzhiyun SetPageUptodate(page);
80*4882a593Smuzhiyun unlock_page(page);
81*4882a593Smuzhiyun brelse(bh);
82*4882a593Smuzhiyun return 0;
83*4882a593Smuzhiyun }
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun const struct address_space_operations ocfs2_fast_symlink_aops = {
86*4882a593Smuzhiyun .readpage = ocfs2_fast_symlink_readpage,
87*4882a593Smuzhiyun };
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun const struct inode_operations ocfs2_symlink_inode_operations = {
90*4882a593Smuzhiyun .get_link = page_get_link,
91*4882a593Smuzhiyun .getattr = ocfs2_getattr,
92*4882a593Smuzhiyun .setattr = ocfs2_setattr,
93*4882a593Smuzhiyun .listxattr = ocfs2_listxattr,
94*4882a593Smuzhiyun .fiemap = ocfs2_fiemap,
95*4882a593Smuzhiyun };
96