blob: ab925ef4f863c9696b9ed0a1832e9d3d6a0c0d07 [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);
52 fromName = build_path_from_dentry(old_file);
53 toName = build_path_from_dentry(direntry);
54 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:
87 if (fromName)
88 kfree(fromName);
89 if (toName)
90 kfree(toName);
91 FreeXid(xid);
92 return rc;
93}
94
Linus Torvaldscc314ee2005-08-19 18:02:56 -070095void *
Linus Torvalds1da177e2005-04-16 15:20:36 -070096cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
97{
98 struct inode *inode = direntry->d_inode;
99 int rc = -EACCES;
100 int xid;
101 char *full_path = NULL;
102 char * target_path = ERR_PTR(-ENOMEM);
103 struct cifs_sb_info *cifs_sb;
104 struct cifsTconInfo *pTcon;
105
106 xid = GetXid();
107
108 down(&direntry->d_sb->s_vfs_rename_sem);
109 full_path = build_path_from_dentry(direntry);
110 up(&direntry->d_sb->s_vfs_rename_sem);
111
112 if (!full_path)
113 goto out_no_free;
114
115 cFYI(1, ("Full path: %s inode = 0x%p", full_path, inode));
116 cifs_sb = CIFS_SB(inode->i_sb);
117 pTcon = cifs_sb->tcon;
118 target_path = kmalloc(PATH_MAX, GFP_KERNEL);
119 if (!target_path) {
120 target_path = ERR_PTR(-ENOMEM);
121 goto out;
122 }
123
124/* BB add read reparse point symlink code and Unix extensions symlink code here BB */
125 if (pTcon->ses->capabilities & CAP_UNIX)
126 rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
127 target_path,
128 PATH_MAX-1,
129 cifs_sb->local_nls);
130 else {
131 /* rc = CIFSSMBQueryReparseLinkInfo */
132 /* BB Add code to Query ReparsePoint info */
133 /* BB Add MAC style xsymlink check here if enabled */
134 }
135
136 if (rc == 0) {
137
138/* BB Add special case check for Samba DFS symlinks */
139
140 target_path[PATH_MAX-1] = 0;
141 } else {
142 kfree(target_path);
143 target_path = ERR_PTR(rc);
144 }
145
146out:
147 kfree(full_path);
148out_no_free:
149 FreeXid(xid);
150 nd_set_link(nd, target_path);
Linus Torvaldscc314ee2005-08-19 18:02:56 -0700151 return NULL; /* No cookie */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152}
153
154int
155cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
156{
157 int rc = -EOPNOTSUPP;
158 int xid;
159 struct cifs_sb_info *cifs_sb;
160 struct cifsTconInfo *pTcon;
161 char *full_path = NULL;
162 struct inode *newinode = NULL;
163
164 xid = GetXid();
165
166 cifs_sb = CIFS_SB(inode->i_sb);
167 pTcon = cifs_sb->tcon;
168
169 down(&inode->i_sb->s_vfs_rename_sem);
170 full_path = build_path_from_dentry(direntry);
171 up(&inode->i_sb->s_vfs_rename_sem);
172
173 if(full_path == NULL) {
174 FreeXid(xid);
175 return -ENOMEM;
176 }
177
178 cFYI(1, ("Full path: %s ", full_path));
179 cFYI(1, ("symname is %s", symname));
180
181 /* BB what if DFS and this volume is on different share? BB */
182 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
183 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
184 cifs_sb->local_nls);
185 /* else
186 rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,cifs_sb_target->local_nls); */
187
188 if (rc == 0) {
189 if (pTcon->ses->capabilities & CAP_UNIX)
190 rc = cifs_get_inode_info_unix(&newinode, full_path,
191 inode->i_sb,xid);
192 else
193 rc = cifs_get_inode_info(&newinode, full_path, NULL,
194 inode->i_sb,xid);
195
196 if (rc != 0) {
197 cFYI(1,
198 ("Create symlink worked but get_inode_info failed with rc = %d ",
199 rc));
200 } else {
201 direntry->d_op = &cifs_dentry_ops;
202 d_instantiate(direntry, newinode);
203 }
204 }
205
206 if (full_path)
207 kfree(full_path);
208 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);*/
236 full_path = build_path_from_dentry(direntry);
237/* 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) {
253 if (full_path)
254 kfree(full_path);
255 FreeXid(xid);
256 return -ENOMEM;
257 }
258
259/* BB add read reparse point symlink code and Unix extensions symlink code here BB */
260 if (cifs_sb->tcon->ses->capabilities & CAP_UNIX)
261 rc = CIFSSMBUnixQuerySymLink(xid, pTcon, full_path,
262 tmpbuffer,
263 len - 1,
264 cifs_sb->local_nls);
265 else {
266 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN, GENERIC_READ,
Steve French737b7582005-04-28 22:41:06 -0700267 OPEN_REPARSE_POINT,&fid, &oplock, NULL,
268 cifs_sb->local_nls,
269 cifs_sb->mnt_cifs_flags &
270 CIFS_MOUNT_MAP_SPECIAL_CHR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 if(!rc) {
272 rc = CIFSSMBQueryReparseLinkInfo(xid, pTcon, full_path,
273 tmpbuffer,
274 len - 1,
275 fid,
276 cifs_sb->local_nls);
277 if(CIFSSMBClose(xid, pTcon, fid)) {
278 cFYI(1,("Error closing junction point (open for ioctl)"));
279 }
280 if(rc == -EIO) {
281 /* Query if DFS Junction */
282 tmp_path =
283 kmalloc(MAX_TREE_SIZE + MAX_PATHCONF + 1,
284 GFP_KERNEL);
285 if (tmp_path) {
286 strncpy(tmp_path, pTcon->treeName, MAX_TREE_SIZE);
287 strncat(tmp_path, full_path, MAX_PATHCONF);
288 rc = get_dfs_path(xid, pTcon->ses, tmp_path,
Steve French737b7582005-04-28 22:41:06 -0700289 cifs_sb->local_nls,
290 &num_referrals, &referrals,
291 cifs_sb->mnt_cifs_flags &
292 CIFS_MOUNT_MAP_SPECIAL_CHR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 cFYI(1,("Get DFS for %s rc = %d ",tmp_path, rc));
294 if((num_referrals == 0) && (rc == 0))
295 rc = -EACCES;
296 else {
297 cFYI(1,("num referral: %d",num_referrals));
298 if(referrals) {
299 cFYI(1,("referral string: %s ",referrals));
300 strncpy(tmpbuffer, referrals, len-1);
301 }
302 }
303 if(referrals)
304 kfree(referrals);
305 kfree(tmp_path);
306}
307 /* BB add code like else decode referrals then memcpy to
308 tmpbuffer and free referrals string array BB */
309 }
310 }
311 }
312 /* BB Anything else to do to handle recursive links? */
313 /* BB Should we be using page ops here? */
314
315 /* BB null terminate returned string in pBuffer? BB */
316 if (rc == 0) {
317 rc = vfs_readlink(direntry, pBuffer, len, tmpbuffer);
318 cFYI(1,
319 ("vfs_readlink called from cifs_readlink returned %d",
320 rc));
321 }
322
323 if (tmpbuffer) {
324 kfree(tmpbuffer);
325 }
326 if (full_path) {
327 kfree(full_path);
328 }
329 FreeXid(xid);
330 return rc;
331}
332
Linus Torvaldscc314ee2005-08-19 18:02:56 -0700333void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334{
335 char *p = nd_get_link(nd);
336 if (!IS_ERR(p))
337 kfree(p);
338}