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
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.
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>
55 #include "buffer_head_io.h"
58 static char *ocfs2_fast_symlink_getlink(struct inode *inode,
59 struct buffer_head **bh)
63 struct ocfs2_dinode *fe;
65 status = ocfs2_read_inode_block(inode, bh);
68 link = ERR_PTR(status);
72 fe = (struct ocfs2_dinode *) (*bh)->b_data;
73 link = (char *) fe->id2.i_symlink;
79 static int ocfs2_readlink(struct dentry *dentry,
85 struct buffer_head *bh = NULL;
86 struct inode *inode = dentry->d_inode;
88 link = ocfs2_fast_symlink_getlink(inode, &bh);
95 * Without vfsmount we can't update atime now,
96 * but we will update atime here ultimately.
98 ret = vfs_readlink(dentry, buffer, buflen, link);
107 static void *ocfs2_fast_follow_link(struct dentry *dentry,
108 struct nameidata *nd)
112 char *target, *link = ERR_PTR(-ENOMEM);
113 struct inode *inode = dentry->d_inode;
114 struct buffer_head *bh = NULL;
116 BUG_ON(!ocfs2_inode_is_fast_symlink(inode));
117 target = ocfs2_fast_symlink_getlink(inode, &bh);
118 if (IS_ERR(target)) {
119 status = PTR_ERR(target);
124 /* Fast symlinks can't be large */
125 len = strnlen(target, ocfs2_fast_symlink_chars(inode->i_sb));
126 link = kzalloc(len + 1, GFP_NOFS);
133 memcpy(link, target, len);
136 nd_set_link(nd, status ? ERR_PTR(status) : link);
144 static void ocfs2_fast_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
146 char *link = nd_get_link(nd);
151 const struct inode_operations ocfs2_symlink_inode_operations = {
152 .readlink = page_readlink,
153 .follow_link = page_follow_link_light,
154 .put_link = page_put_link,
155 .getattr = ocfs2_getattr,
156 .setattr = ocfs2_setattr,
157 .setxattr = generic_setxattr,
158 .getxattr = generic_getxattr,
159 .listxattr = ocfs2_listxattr,
160 .removexattr = generic_removexattr,
161 .fiemap = ocfs2_fiemap,
163 const struct inode_operations ocfs2_fast_symlink_inode_operations = {
164 .readlink = ocfs2_readlink,
165 .follow_link = ocfs2_fast_follow_link,
166 .put_link = ocfs2_fast_put_link,
167 .getattr = ocfs2_getattr,
168 .setattr = ocfs2_setattr,
169 .setxattr = generic_setxattr,
170 .getxattr = generic_getxattr,
171 .listxattr = ocfs2_listxattr,
172 .removexattr = generic_removexattr,
173 .fiemap = ocfs2_fiemap,