Merge branch 'mini2440-dev-unlikely' into mini2440-dev
[linux-2.6/mini2440.git] / fs / ocfs2 / symlink.c
blobe3421030a69f713971a78e7d5d525098a4e44416
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
4 * linux/cluster/ssi/cfs/symlink.c
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.
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.
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.
21 * Questions/Comments/Bugfixes to ssic-linux-devel@lists.sourceforge.net
23 * Copyright (C) 1992 Rick Sladkey
25 * Optimization changes Copyright (C) 1994 Florian La Roche
27 * Jun 7 1999, cache symlink lookups in the page cache. -DaveM
29 * Portions Copyright (C) 2001 Compaq Computer Corporation
31 * ocfs2 symlink handling code.
33 * Copyright (C) 2004, 2005 Oracle.
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>
43 #define MLOG_MASK_PREFIX ML_NAMEI
44 #include <cluster/masklog.h>
46 #include "ocfs2.h"
48 #include "alloc.h"
49 #include "file.h"
50 #include "inode.h"
51 #include "journal.h"
52 #include "symlink.h"
53 #include "xattr.h"
55 #include "buffer_head_io.h"
58 static char *ocfs2_fast_symlink_getlink(struct inode *inode,
59 struct buffer_head **bh)
61 int status;
62 char *link = NULL;
63 struct ocfs2_dinode *fe;
65 mlog_entry_void();
67 status = ocfs2_read_inode_block(inode, bh);
68 if (status < 0) {
69 mlog_errno(status);
70 link = ERR_PTR(status);
71 goto bail;
74 fe = (struct ocfs2_dinode *) (*bh)->b_data;
75 link = (char *) fe->id2.i_symlink;
76 bail:
77 mlog_exit(status);
79 return link;
82 static int ocfs2_readlink(struct dentry *dentry,
83 char __user *buffer,
84 int buflen)
86 int ret;
87 char *link;
88 struct buffer_head *bh = NULL;
89 struct inode *inode = dentry->d_inode;
91 mlog_entry_void();
93 link = ocfs2_fast_symlink_getlink(inode, &bh);
94 if (IS_ERR(link)) {
95 ret = PTR_ERR(link);
96 goto out;
100 * Without vfsmount we can't update atime now,
101 * but we will update atime here ultimately.
103 ret = vfs_readlink(dentry, buffer, buflen, link);
105 brelse(bh);
106 out:
107 mlog_exit(ret);
108 return ret;
111 static void *ocfs2_fast_follow_link(struct dentry *dentry,
112 struct nameidata *nd)
114 int status = 0;
115 int len;
116 char *target, *link = ERR_PTR(-ENOMEM);
117 struct inode *inode = dentry->d_inode;
118 struct buffer_head *bh = NULL;
120 mlog_entry_void();
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);
126 mlog_errno(status);
127 goto bail;
130 /* 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;
139 memcpy(link, target, len);
140 nd_set_link(nd, link);
142 bail:
143 brelse(bh);
145 mlog_exit(status);
146 return status ? ERR_PTR(status) : link;
149 static void ocfs2_fast_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
151 char *link = cookie;
153 kfree(link);
156 const struct inode_operations ocfs2_symlink_inode_operations = {
157 .readlink = page_readlink,
158 .follow_link = page_follow_link_light,
159 .put_link = page_put_link,
160 .getattr = ocfs2_getattr,
161 .setattr = ocfs2_setattr,
162 .setxattr = generic_setxattr,
163 .getxattr = generic_getxattr,
164 .listxattr = ocfs2_listxattr,
165 .removexattr = generic_removexattr,
167 const struct inode_operations ocfs2_fast_symlink_inode_operations = {
168 .readlink = ocfs2_readlink,
169 .follow_link = ocfs2_fast_follow_link,
170 .put_link = ocfs2_fast_put_link,
171 .getattr = ocfs2_getattr,
172 .setattr = ocfs2_setattr,
173 .setxattr = generic_setxattr,
174 .getxattr = generic_getxattr,
175 .listxattr = ocfs2_listxattr,
176 .removexattr = generic_removexattr,