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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/link.c
3 *
Steve French366781c2008-01-25 10:12:41 +00004 * Copyright (C) International Business Machines Corp., 2002,2008
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 * This library is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as published
9 * by the Free Software Foundation; either version 2.1 of the License, or
10 * (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21#include <linux/fs.h>
22#include <linux/stat.h>
23#include <linux/namei.h>
24#include "cifsfs.h"
25#include "cifspdu.h"
26#include "cifsglob.h"
27#include "cifsproto.h"
28#include "cifs_debug.h"
29#include "cifs_fs_sb.h"
30
31int
32cifs_hardlink(struct dentry *old_file, struct inode *inode,
33 struct dentry *direntry)
34{
35 int rc = -EACCES;
36 int xid;
37 char *fromName = NULL;
38 char *toName = NULL;
39 struct cifs_sb_info *cifs_sb_target;
40 struct cifsTconInfo *pTcon;
41 struct cifsInodeInfo *cifsInode;
42
43 xid = GetXid();
44
45 cifs_sb_target = CIFS_SB(inode->i_sb);
46 pTcon = cifs_sb_target->tcon;
47
48/* No need to check for cross device links since server will do that
49 BB note DFS case in future though (when we may have to check) */
50
Steve French7f573562005-08-30 11:32:14 -070051 fromName = build_path_from_dentry(old_file);
52 toName = build_path_from_dentry(direntry);
Steve Frenchfb8c4b12007-07-10 01:16:18 +000053 if ((fromName == NULL) || (toName == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 rc = -ENOMEM;
55 goto cifs_hl_exit;
56 }
57
Steve Frenchc18c8422007-07-18 23:21:09 +000058/* if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)*/
59 if (pTcon->unix_ext)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
Steve Frenchfb8c4b12007-07-10 01:16:18 +000061 cifs_sb_target->local_nls,
Steve French737b7582005-04-28 22:41:06 -070062 cifs_sb_target->mnt_cifs_flags &
63 CIFS_MOUNT_MAP_SPECIAL_CHR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 else {
65 rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
Steve Frenchfb8c4b12007-07-10 01:16:18 +000066 cifs_sb_target->local_nls,
Steve French737b7582005-04-28 22:41:06 -070067 cifs_sb_target->mnt_cifs_flags &
68 CIFS_MOUNT_MAP_SPECIAL_CHR);
Steve Frenchfb8c4b12007-07-10 01:16:18 +000069 if ((rc == -EIO) || (rc == -EINVAL))
70 rc = -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 }
72
Steve French31ec35d2006-11-16 20:54:20 +000073 d_drop(direntry); /* force new lookup from server of target */
74
75 /* if source file is cached (oplocked) revalidate will not go to server
76 until the file is closed or oplock broken so update nlinks locally */
Steve Frenchfb8c4b12007-07-10 01:16:18 +000077 if (old_file->d_inode) {
Steve French31ec35d2006-11-16 20:54:20 +000078 cifsInode = CIFS_I(old_file->d_inode);
Steve Frenchfb8c4b12007-07-10 01:16:18 +000079 if (rc == 0) {
Steve French31ec35d2006-11-16 20:54:20 +000080 old_file->d_inode->i_nlink++;
Steve French1b2b2122007-02-17 04:30:54 +000081/* BB should we make this contingent on superblock flag NOATIME? */
82/* old_file->d_inode->i_ctime = CURRENT_TIME;*/
Steve French31ec35d2006-11-16 20:54:20 +000083 /* parent dir timestamps will update from srv
84 within a second, would it really be worth it
85 to set the parent dir cifs inode time to zero
86 to force revalidate (faster) for it too? */
87 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +000088 /* if not oplocked will force revalidate to get info
Steve French31ec35d2006-11-16 20:54:20 +000089 on source file from srv */
90 cifsInode->time = 0;
91
Steve Frenchfb8c4b12007-07-10 01:16:18 +000092 /* Will update parent dir timestamps from srv within a second.
Steve French31ec35d2006-11-16 20:54:20 +000093 Would it really be worth it to set the parent dir (cifs
94 inode) time field to zero to force revalidate on parent
Steve Frenchfb8c4b12007-07-10 01:16:18 +000095 directory faster ie
Steve French31ec35d2006-11-16 20:54:20 +000096 CIFS_I(inode)->time = 0; */
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99cifs_hl_exit:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800100 kfree(fromName);
101 kfree(toName);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 FreeXid(xid);
103 return rc;
104}
105
Linus Torvaldscc314ee2005-08-19 18:02:56 -0700106void *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
108{
109 struct inode *inode = direntry->d_inode;
Jeff Layton8b6427a2009-05-19 09:57:03 -0400110 int rc = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 int xid;
112 char *full_path = NULL;
Jeff Layton8b6427a2009-05-19 09:57:03 -0400113 char *target_path = NULL;
114 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
115 struct cifsTconInfo *tcon = cifs_sb->tcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
117 xid = GetXid();
118
Jeff Layton8b6427a2009-05-19 09:57:03 -0400119 /*
120 * For now, we just handle symlinks with unix extensions enabled.
121 * Eventually we should handle NTFS reparse points, and MacOS
122 * symlink support. For instance...
123 *
124 * rc = CIFSSMBQueryReparseLinkInfo(...)
125 *
126 * For now, just return -EACCES when the server doesn't support posix
127 * extensions. Note that we still allow querying symlinks when posix
128 * extensions are manually disabled. We could disable these as well
129 * but there doesn't seem to be any harm in allowing the client to
130 * read them.
131 */
132 if (!(tcon->ses->capabilities & CAP_UNIX)) {
133 rc = -EACCES;
134 goto out;
135 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Jeff Layton8b6427a2009-05-19 09:57:03 -0400137 full_path = build_path_from_dentry(direntry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 if (!full_path)
Jeff Layton460b9692009-04-30 07:17:56 -0400139 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141 cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Jeff Layton8b6427a2009-05-19 09:57:03 -0400143 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
144 cifs_sb->local_nls);
145 kfree(full_path);
146out:
Jeff Layton460b9692009-04-30 07:17:56 -0400147 if (rc != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 kfree(target_path);
149 target_path = ERR_PTR(rc);
150 }
151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 FreeXid(xid);
153 nd_set_link(nd, target_path);
Jeff Layton460b9692009-04-30 07:17:56 -0400154 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155}
156
157int
158cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
159{
160 int rc = -EOPNOTSUPP;
161 int xid;
162 struct cifs_sb_info *cifs_sb;
163 struct cifsTconInfo *pTcon;
164 char *full_path = NULL;
165 struct inode *newinode = NULL;
166
167 xid = GetXid();
168
169 cifs_sb = CIFS_SB(inode->i_sb);
170 pTcon = cifs_sb->tcon;
171
Steve French7f573562005-08-30 11:32:14 -0700172 full_path = build_path_from_dentry(direntry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000174 if (full_path == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 FreeXid(xid);
176 return -ENOMEM;
177 }
178
Steve French26a21b92006-05-31 18:05:34 +0000179 cFYI(1, ("Full path: %s", full_path));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 cFYI(1, ("symname is %s", symname));
181
182 /* BB what if DFS and this volume is on different share? BB */
Steve Frenchc18c8422007-07-18 23:21:09 +0000183 if (pTcon->unix_ext)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
185 cifs_sb->local_nls);
186 /* else
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000187 rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
188 cifs_sb_target->local_nls); */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
190 if (rc == 0) {
Steve Frenchc18c8422007-07-18 23:21:09 +0000191 if (pTcon->unix_ext)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 rc = cifs_get_inode_info_unix(&newinode, full_path,
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000193 inode->i_sb, xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 else
195 rc = cifs_get_inode_info(&newinode, full_path, NULL,
Steve French8b1327f2008-03-14 22:37:16 +0000196 inode->i_sb, xid, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198 if (rc != 0) {
Steve French26a21b92006-05-31 18:05:34 +0000199 cFYI(1, ("Create symlink ok, getinodeinfo fail rc = %d",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 rc));
201 } else {
Steve Frenchb92327f2005-08-22 20:09:43 -0700202 if (pTcon->nocase)
203 direntry->d_op = &cifs_ci_dentry_ops;
204 else
205 direntry->d_op = &cifs_dentry_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 d_instantiate(direntry, newinode);
207 }
208 }
209
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800210 kfree(full_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 FreeXid(xid);
212 return rc;
213}
214
Linus Torvaldscc314ee2005-08-19 18:02:56 -0700215void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216{
217 char *p = nd_get_link(nd);
218 if (!IS_ERR(p))
219 kfree(p);
220}