blob: 0f99aae33162fbd68f5e08a32713db3055a418cf [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/cifs/link.c
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2003
5 * 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
51 down(&inode->i_sb->s_vfs_rename_sem);
Steve French7f573562005-08-30 11:32:14 -070052 fromName = build_path_from_dentry(old_file);
53 toName = build_path_from_dentry(direntry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 up(&inode->i_sb->s_vfs_rename_sem);
55 if((fromName == NULL) || (toName == NULL)) {
56 rc = -ENOMEM;
57 goto cifs_hl_exit;
58 }
59
60 if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)
61 rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
Steve French737b7582005-04-28 22:41:06 -070062 cifs_sb_target->local_nls,
63 cifs_sb_target->mnt_cifs_flags &
64 CIFS_MOUNT_MAP_SPECIAL_CHR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 else {
66 rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
Steve French737b7582005-04-28 22:41:06 -070067 cifs_sb_target->local_nls,
68 cifs_sb_target->mnt_cifs_flags &
69 CIFS_MOUNT_MAP_SPECIAL_CHR);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 if(rc == -EIO)
71 rc = -EOPNOTSUPP;
72 }
73
74/* if (!rc) */
75 {
76 /* renew_parental_timestamps(old_file);
77 inode->i_nlink++;
78 mark_inode_dirty(inode);
79 d_instantiate(direntry, inode); */
80 /* BB add call to either mark inode dirty or refresh its data and timestamp to current time */
81 }
82 d_drop(direntry); /* force new lookup from server */
83 cifsInode = CIFS_I(old_file->d_inode);
84 cifsInode->time = 0; /* will force revalidate to go get info when needed */
85
86cifs_hl_exit:
Jesper Juhlf99d49a2005-11-07 01:01:34 -080087 kfree(fromName);
88 kfree(toName);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 FreeXid(xid);
90 return rc;
91}
92
Linus Torvaldscc314ee2005-08-19 18:02:56 -070093void *
Linus Torvalds1da177e2005-04-16 15:20:36 -070094cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
95{
96 struct inode *inode = direntry->d_inode;
97 int rc = -EACCES;
98 int xid;
99 char *full_path = NULL;
100 char * target_path = ERR_PTR(-ENOMEM);
101 struct cifs_sb_info *cifs_sb;
102 struct cifsTconInfo *pTcon;
103
104 xid = GetXid();
105
106 down(&direntry->d_sb->s_vfs_rename_sem);
Steve French7f573562005-08-30 11:32:14 -0700107 full_path = build_path_from_dentry(direntry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 up(&direntry->d_sb->s_vfs_rename_sem);
109
110 if (!full_path)
111 goto out_no_free;
112
113 cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode));
Steve French7f573562005-08-30 11:32:14 -0700114 cifs_sb = CIFS_SB(inode->i_sb);
115 pTcon = cifs_sb->tcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
117 if (!target_path) {
118 target_path = ERR_PTR(-ENOMEM);
119 goto out;
120 }
121
122/* BB add read reparse point symlink code and Unix extensions symlink code here BB */
123 if (pTcon->ses->capabilities & CAP_UNIX)
124 rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
125 target_path,
126 PATH_MAX-1,
127 cifs_sb->local_nls);
128 else {
129 /* rc = CIFSSMBQueryReparseLinkInfo */
130 /* BB Add code to Query ReparsePoint info */
131 /* BB Add MAC style xsymlink check here if enabled */
132 }
133
134 if (rc == 0) {
135
136/* BB Add special case check for Samba DFS symlinks */
137
138 target_path[PATH_MAX-1] = 0;
139 } else {
140 kfree(target_path);
141 target_path = ERR_PTR(rc);
142 }
143
144out:
145 kfree(full_path);
146out_no_free:
147 FreeXid(xid);
148 nd_set_link(nd, target_path);
Linus Torvaldscc314ee2005-08-19 18:02:56 -0700149 return NULL; /* No cookie */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
152int
153cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
154{
155 int rc = -EOPNOTSUPP;
156 int xid;
157 struct cifs_sb_info *cifs_sb;
158 struct cifsTconInfo *pTcon;
159 char *full_path = NULL;
160 struct inode *newinode = NULL;
161
162 xid = GetXid();
163
164 cifs_sb = CIFS_SB(inode->i_sb);
165 pTcon = cifs_sb->tcon;
166
167 down(&inode->i_sb->s_vfs_rename_sem);
Steve French7f573562005-08-30 11:32:14 -0700168 full_path = build_path_from_dentry(direntry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 up(&inode->i_sb->s_vfs_rename_sem);
170
171 if(full_path == NULL) {
172 FreeXid(xid);
173 return -ENOMEM;
174 }
175
176 cFYI(1, ("Full path: %s ", full_path));
177 cFYI(1, ("symname is %s", symname));
178
179 /* BB what if DFS and this volume is on different share? BB */
180 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
181 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
182 cifs_sb->local_nls);
183 /* else
184 rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,cifs_sb_target->local_nls); */
185
186 if (rc == 0) {
187 if (pTcon->ses->capabilities & CAP_UNIX)
188 rc = cifs_get_inode_info_unix(&newinode, full_path,
189 inode->i_sb,xid);
190 else
191 rc = cifs_get_inode_info(&newinode, full_path, NULL,
192 inode->i_sb,xid);
193
194 if (rc != 0) {
195 cFYI(1,
196 ("Create symlink worked but get_inode_info failed with rc = %d ",
197 rc));
198 } else {
Steve Frenchb92327f2005-08-22 20:09:43 -0700199 if (pTcon->nocase)
200 direntry->d_op = &cifs_ci_dentry_ops;
201 else
202 direntry->d_op = &cifs_dentry_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 d_instantiate(direntry, newinode);
204 }
205 }
206
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800207 kfree(full_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 FreeXid(xid);
209 return rc;
210}
211
212int
213cifs_readlink(struct dentry *direntry, char __user *pBuffer, int buflen)
214{
215 struct inode *inode = direntry->d_inode;
216 int rc = -EACCES;
217 int xid;
218 int oplock = FALSE;
219 struct cifs_sb_info *cifs_sb;
220 struct cifsTconInfo *pTcon;
221 char *full_path = NULL;
222 char *tmp_path = NULL;
223 char * tmpbuffer;
224 unsigned char * referrals = NULL;
225 int num_referrals = 0;
226 int len;
227 __u16 fid;
228
229 xid = GetXid();
230 cifs_sb = CIFS_SB(inode->i_sb);
231 pTcon = cifs_sb->tcon;
232
233/* BB would it be safe against deadlock to grab this sem
234 even though rename itself grabs the sem and calls lookup? */
235/* down(&inode->i_sb->s_vfs_rename_sem);*/
Steve French7f573562005-08-30 11:32:14 -0700236 full_path = build_path_from_dentry(direntry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237/* up(&inode->i_sb->s_vfs_rename_sem);*/
238
239 if(full_path == NULL) {
240 FreeXid(xid);
241 return -ENOMEM;
242 }
243
244 cFYI(1,
245 ("Full path: %s inode = 0x%p pBuffer = 0x%p buflen = %d",
246 full_path, inode, pBuffer, buflen));
247 if(buflen > PATH_MAX)
248 len = PATH_MAX;
249 else
250 len = buflen;
251 tmpbuffer = kmalloc(len,GFP_KERNEL);
252 if(tmpbuffer == NULL) {
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800253 kfree(full_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 FreeXid(xid);
255 return -ENOMEM;
256 }
257
258/* BB add read reparse point symlink code and Unix extensions symlink code here BB */
259 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
260 rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
261 tmpbuffer,
262 len - 1,
263 cifs_sb->local_nls);
264 else {
265 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ,
Steve French737b7582005-04-28 22:41:06 -0700266 OPEN_REPARSE_POINT,&fid, &oplock, NULL,
267 cifs_sb->local_nls,
268 cifs_sb->mnt_cifs_flags &
269 CIFS_MOUNT_MAP_SPECIAL_CHR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 if(!rc) {
271 rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path,
272 tmpbuffer,
273 len - 1,
274 fid,
275 cifs_sb->local_nls);
276 if(CIFSSMBClose(xid, pTcon, fid)) {
277 cFYI(1,("Error closing junction point (open for ioctl)"));
278 }
279 if(rc == -EIO) {
280 /* Query if DFS Junction */
281 tmp_path =
282 kmalloc(MAX_TREE_SIZE + MAX_PATHCONF + 1,
283 GFP_KERNEL);
284 if (tmp_path) {
285 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
286 strncat(tmp_path, full_path, MAX_PATHCONF);
287 rc = get_dfs_path(xid, pTcon->ses, tmp_path,
Steve French737b7582005-04-28 22:41:06 -0700288 cifs_sb->local_nls,
289 &num_referrals, &referrals,
290 cifs_sb->mnt_cifs_flags &
291 CIFS_MOUNT_MAP_SPECIAL_CHR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 cFYI(1,("Get DFS for %s rc = %d ",tmp_path, rc));
293 if((num_referrals == 0) && (rc == 0))
294 rc = -EACCES;
295 else {
296 cFYI(1,("num referral: %d",num_referrals));
297 if(referrals) {
298 cFYI(1,("referral string: %s ",referrals));
299 strncpy(tmpbuffer, referrals, len-1);
300 }
301 }
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800302 kfree(referrals);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 kfree(tmp_path);
304}
305 /* BB add code like else decode referrals then memcpy to
306 tmpbuffer and free referrals string array BB */
307 }
308 }
309 }
310 /* BB Anything else to do to handle recursive links? */
311 /* BB Should we be using page ops here? */
312
313 /* BB null terminate returned string in pBuffer? BB */
314 if (rc == 0) {
315 rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer);
316 cFYI(1,
317 ("vfs_readlink called from cifs_readlink returned %d",
318 rc));
319 }
320
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800321 kfree(tmpbuffer);
322 kfree(full_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 FreeXid(xid);
324 return rc;
325}
326
Linus Torvaldscc314ee2005-08-19 18:02:56 -0700327void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328{
329 char *p = nd_get_link(nd);
330 if (!IS_ERR(p))
331 kfree(p);
332}