blob: ed0a0cfd68d26b369be863d8ff70630bd8a1c5f1 [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- 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/utsname.h>
42
43#define MLOG_MASK_PREFIX ML_NAMEI
44#include <cluster/masklog.h>
45
46#include "ocfs2.h"
47
48#include "alloc.h"
49#include "file.h"
50#include "inode.h"
51#include "journal.h"
52#include "symlink.h"
Tiger Yangcf1d6c72008-08-18 17:11:00 +080053#include "xattr.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080054
55#include "buffer_head_io.h"
56
57static char *ocfs2_page_getlink(struct dentry * dentry,
58 struct page **ppage);
59static char *ocfs2_fast_symlink_getlink(struct inode *inode,
60 struct buffer_head **bh);
61
62/* get the link contents into pagecache */
63static char *ocfs2_page_getlink(struct dentry * dentry,
64 struct page **ppage)
65{
66 struct page * page;
67 struct address_space *mapping = dentry->d_inode->i_mapping;
Pekka Enberg090d2b12006-06-23 02:05:08 -070068 page = read_mapping_page(mapping, 0, NULL);
Mark Fashehccd979b2005-12-15 14:31:24 -080069 if (IS_ERR(page))
70 goto sync_fail;
Mark Fashehccd979b2005-12-15 14:31:24 -080071 *ppage = page;
72 return kmap(page);
73
Mark Fashehccd979b2005-12-15 14:31:24 -080074sync_fail:
75 return (char*)page;
76}
77
78static char *ocfs2_fast_symlink_getlink(struct inode *inode,
79 struct buffer_head **bh)
80{
81 int status;
82 char *link = NULL;
83 struct ocfs2_dinode *fe;
84
85 mlog_entry_void();
86
Joel Beckerb657c952008-11-13 14:49:11 -080087 status = ocfs2_read_inode_block(inode, bh);
Mark Fashehccd979b2005-12-15 14:31:24 -080088 if (status < 0) {
89 mlog_errno(status);
90 link = ERR_PTR(status);
91 goto bail;
92 }
93
94 fe = (struct ocfs2_dinode *) (*bh)->b_data;
95 link = (char *) fe->id2.i_symlink;
96bail:
97 mlog_exit(status);
98
99 return link;
100}
101
102static int ocfs2_readlink(struct dentry *dentry,
103 char __user *buffer,
104 int buflen)
105{
106 int ret;
107 char *link;
108 struct buffer_head *bh = NULL;
109 struct inode *inode = dentry->d_inode;
110
111 mlog_entry_void();
112
113 link = ocfs2_fast_symlink_getlink(inode, &bh);
114 if (IS_ERR(link)) {
115 ret = PTR_ERR(link);
116 goto out;
117 }
118
Tiger Yang25899de2006-11-15 15:49:02 +0800119 /*
120 * Without vfsmount we can't update atime now,
121 * but we will update atime here ultimately.
122 */
Mark Fashehccd979b2005-12-15 14:31:24 -0800123 ret = vfs_readlink(dentry, buffer, buflen, link);
124
125 brelse(bh);
126out:
127 mlog_exit(ret);
128 return ret;
129}
130
131static void *ocfs2_follow_link(struct dentry *dentry,
132 struct nameidata *nd)
133{
134 int status;
135 char *link;
136 struct inode *inode = dentry->d_inode;
137 struct page *page = NULL;
138 struct buffer_head *bh = NULL;
139
140 if (ocfs2_inode_is_fast_symlink(inode))
141 link = ocfs2_fast_symlink_getlink(inode, &bh);
142 else
143 link = ocfs2_page_getlink(dentry, &page);
144 if (IS_ERR(link)) {
145 status = PTR_ERR(link);
146 mlog_errno(status);
147 goto bail;
148 }
149
150 status = vfs_follow_link(nd, link);
Mark Fasheh72bce502007-01-03 17:25:40 -0800151
Mark Fashehccd979b2005-12-15 14:31:24 -0800152bail:
153 if (page) {
154 kunmap(page);
155 page_cache_release(page);
156 }
Mark Fasheha81cb882008-10-07 14:25:16 -0700157 brelse(bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800158
159 return ERR_PTR(status);
160}
161
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800162const struct inode_operations ocfs2_symlink_inode_operations = {
Mark Fashehccd979b2005-12-15 14:31:24 -0800163 .readlink = page_readlink,
164 .follow_link = ocfs2_follow_link,
165 .getattr = ocfs2_getattr,
Sunil Mushranbc535802008-04-18 10:23:53 -0700166 .setattr = ocfs2_setattr,
Tiger Yangcf1d6c72008-08-18 17:11:00 +0800167 .setxattr = generic_setxattr,
168 .getxattr = generic_getxattr,
169 .listxattr = ocfs2_listxattr,
170 .removexattr = generic_removexattr,
Mark Fashehccd979b2005-12-15 14:31:24 -0800171};
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800172const struct inode_operations ocfs2_fast_symlink_inode_operations = {
Mark Fashehccd979b2005-12-15 14:31:24 -0800173 .readlink = ocfs2_readlink,
174 .follow_link = ocfs2_follow_link,
175 .getattr = ocfs2_getattr,
Sunil Mushranbc535802008-04-18 10:23:53 -0700176 .setattr = ocfs2_setattr,
Tiger Yangcf1d6c72008-08-18 17:11:00 +0800177 .setxattr = generic_setxattr,
178 .getxattr = generic_getxattr,
179 .listxattr = ocfs2_listxattr,
180 .removexattr = generic_removexattr,
Mark Fashehccd979b2005-12-15 14:31:24 -0800181};