blob: e3421030a69f713971a78e7d5d525098a4e44416 [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>
Joel Beckera731d122009-04-06 16:43:42 -070041#include <linux/namei.h>
Mark Fashehccd979b2005-12-15 14:31:24 -080042
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
Mark Fashehccd979b2005-12-15 14:31:24 -080057
58static char *ocfs2_fast_symlink_getlink(struct inode *inode,
59 struct buffer_head **bh)
60{
61 int status;
62 char *link = NULL;
63 struct ocfs2_dinode *fe;
64
65 mlog_entry_void();
66
Joel Beckerb657c952008-11-13 14:49:11 -080067 status = ocfs2_read_inode_block(inode, bh);
Mark Fashehccd979b2005-12-15 14:31:24 -080068 if (status < 0) {
69 mlog_errno(status);
70 link = ERR_PTR(status);
71 goto bail;
72 }
73
74 fe = (struct ocfs2_dinode *) (*bh)->b_data;
75 link = (char *) fe->id2.i_symlink;
76bail:
77 mlog_exit(status);
78
79 return link;
80}
81
82static int ocfs2_readlink(struct dentry *dentry,
83 char __user *buffer,
84 int buflen)
85{
86 int ret;
87 char *link;
88 struct buffer_head *bh = NULL;
89 struct inode *inode = dentry->d_inode;
90
91 mlog_entry_void();
92
93 link = ocfs2_fast_symlink_getlink(inode, &bh);
94 if (IS_ERR(link)) {
95 ret = PTR_ERR(link);
96 goto out;
97 }
98
Tiger Yang25899de2006-11-15 15:49:02 +080099 /*
100 * Without vfsmount we can't update atime now,
101 * but we will update atime here ultimately.
102 */
Mark Fashehccd979b2005-12-15 14:31:24 -0800103 ret = vfs_readlink(dentry, buffer, buflen, link);
104
105 brelse(bh);
106out:
107 mlog_exit(ret);
108 return ret;
109}
110
Joel Beckera731d122009-04-06 16:43:42 -0700111static void *ocfs2_fast_follow_link(struct dentry *dentry,
112 struct nameidata *nd)
Mark Fashehccd979b2005-12-15 14:31:24 -0800113{
Joel Beckera731d122009-04-06 16:43:42 -0700114 int status = 0;
115 int len;
116 char *target, *link = ERR_PTR(-ENOMEM);
Mark Fashehccd979b2005-12-15 14:31:24 -0800117 struct inode *inode = dentry->d_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -0800118 struct buffer_head *bh = NULL;
Joel Beckera731d122009-04-06 16:43:42 -0700119
120 mlog_entry_void();
121
122 BUG_ON(!ocfs2_inode_is_fast_symlink(inode));
123 target = ocfs2_fast_symlink_getlink(inode, &bh);
124 if (IS_ERR(target)) {
125 status = PTR_ERR(target);
Mark Fashehccd979b2005-12-15 14:31:24 -0800126 mlog_errno(status);
127 goto bail;
128 }
129
Joel Beckera731d122009-04-06 16:43:42 -0700130 /* Fast symlinks can't be large */
131 len = strlen(target);
132 link = kzalloc(len + 1, GFP_NOFS);
133 if (!link) {
134 status = -ENOMEM;
135 mlog_errno(status);
136 goto bail;
137 }
138
139 memcpy(link, target, len);
140 nd_set_link(nd, link);
Mark Fasheh72bce502007-01-03 17:25:40 -0800141
Mark Fashehccd979b2005-12-15 14:31:24 -0800142bail:
Mark Fasheha81cb882008-10-07 14:25:16 -0700143 brelse(bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800144
Joel Beckera731d122009-04-06 16:43:42 -0700145 mlog_exit(status);
146 return status ? ERR_PTR(status) : link;
147}
148
149static void ocfs2_fast_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
150{
151 char *link = cookie;
152
153 kfree(link);
Mark Fashehccd979b2005-12-15 14:31:24 -0800154}
155
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800156const struct inode_operations ocfs2_symlink_inode_operations = {
Mark Fashehccd979b2005-12-15 14:31:24 -0800157 .readlink = page_readlink,
Joel Beckera731d122009-04-06 16:43:42 -0700158 .follow_link = page_follow_link_light,
159 .put_link = page_put_link,
Mark Fashehccd979b2005-12-15 14:31:24 -0800160 .getattr = ocfs2_getattr,
Sunil Mushranbc535802008-04-18 10:23:53 -0700161 .setattr = ocfs2_setattr,
Tiger Yangcf1d6c72008-08-18 17:11:00 +0800162 .setxattr = generic_setxattr,
163 .getxattr = generic_getxattr,
164 .listxattr = ocfs2_listxattr,
165 .removexattr = generic_removexattr,
Mark Fashehccd979b2005-12-15 14:31:24 -0800166};
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800167const struct inode_operations ocfs2_fast_symlink_inode_operations = {
Mark Fashehccd979b2005-12-15 14:31:24 -0800168 .readlink = ocfs2_readlink,
Joel Beckera731d122009-04-06 16:43:42 -0700169 .follow_link = ocfs2_fast_follow_link,
170 .put_link = ocfs2_fast_put_link,
Mark Fashehccd979b2005-12-15 14:31:24 -0800171 .getattr = ocfs2_getattr,
Sunil Mushranbc535802008-04-18 10:23:53 -0700172 .setattr = ocfs2_setattr,
Tiger Yangcf1d6c72008-08-18 17:11:00 +0800173 .setxattr = generic_setxattr,
174 .getxattr = generic_getxattr,
175 .listxattr = ocfs2_listxattr,
176 .removexattr = generic_removexattr,
Mark Fashehccd979b2005-12-15 14:31:24 -0800177};