blob: 85cdbf831e7baca6c3d3fbdb1ac670e69fc595ad [file] [log] [blame]
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/namei.h>
25#include "cifsfs.h"
26#include "cifspdu.h"
27#include "cifsglob.h"
28#include "cifsproto.h"
29#include "cifs_debug.h"
30#include "cifs_fs_sb.h"
Stefan Metzmacherc69c1b62010-07-31 09:14:16 +020031#include "md5.h"
32
33#define CIFS_MF_SYMLINK_LEN_OFFSET (4+1)
34#define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1))
35#define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1))
36#define CIFS_MF_SYMLINK_LINK_MAXLEN (1024)
37#define CIFS_MF_SYMLINK_FILE_SIZE \
38 (CIFS_MF_SYMLINK_LINK_OFFSET + CIFS_MF_SYMLINK_LINK_MAXLEN)
39
40#define CIFS_MF_SYMLINK_LEN_FORMAT "XSym\n%04u\n"
41#define CIFS_MF_SYMLINK_MD5_FORMAT \
42 "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n"
43#define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) \
44 md5_hash[0], md5_hash[1], md5_hash[2], md5_hash[3], \
45 md5_hash[4], md5_hash[5], md5_hash[6], md5_hash[7], \
46 md5_hash[8], md5_hash[9], md5_hash[10], md5_hash[11],\
47 md5_hash[12], md5_hash[13], md5_hash[14], md5_hash[15]
48
49static int
50CIFSParseMFSymlink(const u8 *buf,
51 unsigned int buf_len,
52 unsigned int *_link_len,
53 char **_link_str)
54{
55 int rc;
56 unsigned int link_len;
57 const char *md5_str1;
58 const char *link_str;
59 struct MD5Context md5_ctx;
60 u8 md5_hash[16];
61 char md5_str2[34];
62
63 if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
64 return -EINVAL;
65
66 md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET];
67 link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET];
68
69 rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len);
70 if (rc != 1)
71 return -EINVAL;
72
73 cifs_MD5_init(&md5_ctx);
74 cifs_MD5_update(&md5_ctx, (const u8 *)link_str, link_len);
75 cifs_MD5_final(md5_hash, &md5_ctx);
76
77 snprintf(md5_str2, sizeof(md5_str2),
78 CIFS_MF_SYMLINK_MD5_FORMAT,
79 CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
80
81 if (strncmp(md5_str1, md5_str2, 17) != 0)
82 return -EINVAL;
83
84 if (_link_str) {
85 *_link_str = kstrndup(link_str, link_len, GFP_KERNEL);
86 if (!*_link_str)
87 return -ENOMEM;
88 }
89
90 *_link_len = link_len;
91 return 0;
92}
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
Stefan Metzmacher0fd43ae2010-08-05 21:13:44 +020094static int
Stefan Metzmacher18bddd12010-08-03 11:24:22 +020095CIFSFormatMFSymlink(u8 *buf, unsigned int buf_len, const char *link_str)
96{
97 unsigned int link_len;
98 unsigned int ofs;
99 struct MD5Context md5_ctx;
100 u8 md5_hash[16];
101
102 if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
103 return -EINVAL;
104
105 link_len = strlen(link_str);
106
107 if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN)
108 return -ENAMETOOLONG;
109
110 cifs_MD5_init(&md5_ctx);
111 cifs_MD5_update(&md5_ctx, (const u8 *)link_str, link_len);
112 cifs_MD5_final(md5_hash, &md5_ctx);
113
114 snprintf(buf, buf_len,
115 CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT,
116 link_len,
117 CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
118
119 ofs = CIFS_MF_SYMLINK_LINK_OFFSET;
120 memcpy(buf + ofs, link_str, link_len);
121
122 ofs += link_len;
123 if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
124 buf[ofs] = '\n';
125 ofs++;
126 }
127
128 while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
129 buf[ofs] = ' ';
130 ofs++;
131 }
132
133 return 0;
134}
135
Stefan Metzmacher8713d012010-08-05 21:15:22 +0200136static int
137CIFSCreateMFSymLink(const int xid, struct cifsTconInfo *tcon,
138 const char *fromName, const char *toName,
139 const struct nls_table *nls_codepage, int remap)
140{
141 int rc;
142 int oplock = 0;
143 __u16 netfid = 0;
144 u8 *buf;
145 unsigned int bytes_written = 0;
146
147 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
148 if (!buf)
149 return -ENOMEM;
150
151 rc = CIFSFormatMFSymlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
152 if (rc != 0) {
153 kfree(buf);
154 return rc;
155 }
156
157 rc = CIFSSMBOpen(xid, tcon, fromName, FILE_CREATE, GENERIC_WRITE,
158 CREATE_NOT_DIR, &netfid, &oplock, NULL,
159 nls_codepage, remap);
160 if (rc != 0) {
161 kfree(buf);
162 return rc;
163 }
164
165 rc = CIFSSMBWrite(xid, tcon, netfid,
166 CIFS_MF_SYMLINK_FILE_SIZE /* length */,
167 0 /* offset */,
168 &bytes_written, buf, NULL, 0);
169 CIFSSMBClose(xid, tcon, netfid);
170 kfree(buf);
171 if (rc != 0)
172 return rc;
173
174 if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
175 return -EIO;
176
177 return 0;
178}
179
180static int
Stefan Metzmacher0fd43ae2010-08-05 21:13:44 +0200181CIFSQueryMFSymLink(const int xid, struct cifsTconInfo *tcon,
182 const unsigned char *searchName, char **symlinkinfo,
183 const struct nls_table *nls_codepage, int remap)
184{
185 int rc;
186 int oplock = 0;
187 __u16 netfid = 0;
188 u8 *buf;
189 char *pbuf;
190 unsigned int bytes_read = 0;
191 int buf_type = CIFS_NO_BUFFER;
192 unsigned int link_len = 0;
193 FILE_ALL_INFO file_info;
194
195 rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ,
196 CREATE_NOT_DIR, &netfid, &oplock, &file_info,
197 nls_codepage, remap);
198 if (rc != 0)
199 return rc;
200
201 if (file_info.EndOfFile != CIFS_MF_SYMLINK_FILE_SIZE) {
202 CIFSSMBClose(xid, tcon, netfid);
203 /* it's not a symlink */
204 return -EINVAL;
205 }
206
207 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
208 if (!buf)
209 return -ENOMEM;
210 pbuf = buf;
211
212 rc = CIFSSMBRead(xid, tcon, netfid,
213 CIFS_MF_SYMLINK_FILE_SIZE /* length */,
214 0 /* offset */,
215 &bytes_read, &pbuf, &buf_type);
216 CIFSSMBClose(xid, tcon, netfid);
217 if (rc != 0) {
218 kfree(buf);
219 return rc;
220 }
221
222 rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, symlinkinfo);
223 kfree(buf);
224 if (rc != 0)
225 return rc;
226
227 return 0;
228}
229
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200230bool
231CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr)
232{
233 if (!(fattr->cf_mode & S_IFREG))
234 /* it's not a symlink */
235 return false;
236
237 if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
238 /* it's not a symlink */
239 return false;
240
241 return true;
242}
243
244int
245CIFSCheckMFSymlink(struct cifs_fattr *fattr,
246 const unsigned char *path,
247 struct cifs_sb_info *cifs_sb, int xid)
248{
249 int rc;
250 int oplock = 0;
251 __u16 netfid = 0;
Jeff Layton7ffec372010-09-29 19:51:11 -0400252 struct tcon_link *tlink;
253 struct cifsTconInfo *pTcon;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200254 u8 *buf;
255 char *pbuf;
256 unsigned int bytes_read = 0;
257 int buf_type = CIFS_NO_BUFFER;
258 unsigned int link_len = 0;
259 FILE_ALL_INFO file_info;
260
261 if (!CIFSCouldBeMFSymlink(fattr))
262 /* it's not a symlink */
263 return 0;
264
Jeff Layton7ffec372010-09-29 19:51:11 -0400265 tlink = cifs_sb_tlink(cifs_sb);
266 if (IS_ERR(tlink))
267 return PTR_ERR(tlink);
268 pTcon = tlink_tcon(tlink);
269
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200270 rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ,
271 CREATE_NOT_DIR, &netfid, &oplock, &file_info,
272 cifs_sb->local_nls,
273 cifs_sb->mnt_cifs_flags &
274 CIFS_MOUNT_MAP_SPECIAL_CHR);
275 if (rc != 0)
Jeff Layton7ffec372010-09-29 19:51:11 -0400276 goto out;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200277
278 if (file_info.EndOfFile != CIFS_MF_SYMLINK_FILE_SIZE) {
279 CIFSSMBClose(xid, pTcon, netfid);
280 /* it's not a symlink */
Jeff Layton7ffec372010-09-29 19:51:11 -0400281 goto out;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200282 }
283
284 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
Jeff Layton7ffec372010-09-29 19:51:11 -0400285 if (!buf) {
286 rc = -ENOMEM;
287 goto out;
288 }
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200289 pbuf = buf;
290
291 rc = CIFSSMBRead(xid, pTcon, netfid,
292 CIFS_MF_SYMLINK_FILE_SIZE /* length */,
293 0 /* offset */,
294 &bytes_read, &pbuf, &buf_type);
295 CIFSSMBClose(xid, pTcon, netfid);
296 if (rc != 0) {
297 kfree(buf);
Jeff Layton7ffec372010-09-29 19:51:11 -0400298 goto out;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200299 }
300
301 rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, NULL);
302 kfree(buf);
Jeff Layton7ffec372010-09-29 19:51:11 -0400303 if (rc == -EINVAL) {
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200304 /* it's not a symlink */
Jeff Layton7ffec372010-09-29 19:51:11 -0400305 rc = 0;
306 goto out;
307 }
308
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200309 if (rc != 0)
Jeff Layton7ffec372010-09-29 19:51:11 -0400310 goto out;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200311
312 /* it is a symlink */
313 fattr->cf_eof = link_len;
314 fattr->cf_mode &= ~S_IFMT;
315 fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
316 fattr->cf_dtype = DT_LNK;
Jeff Layton7ffec372010-09-29 19:51:11 -0400317out:
318 cifs_put_tlink(tlink);
319 return rc;
Stefan Metzmacher8bfb50a2010-07-31 09:15:10 +0200320}
321
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322int
323cifs_hardlink(struct dentry *old_file, struct inode *inode,
324 struct dentry *direntry)
325{
326 int rc = -EACCES;
327 int xid;
328 char *fromName = NULL;
329 char *toName = NULL;
Jeff Layton7ffec372010-09-29 19:51:11 -0400330 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
331 struct tcon_link *tlink;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 struct cifsTconInfo *pTcon;
333 struct cifsInodeInfo *cifsInode;
334
Jeff Layton7ffec372010-09-29 19:51:11 -0400335 tlink = cifs_sb_tlink(cifs_sb);
336 if (IS_ERR(tlink))
337 return PTR_ERR(tlink);
338 pTcon = tlink_tcon(tlink);
339
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 xid = GetXid();
341
Steve French7f573562005-08-30 11:32:14 -0700342 fromName = build_path_from_dentry(old_file);
343 toName = build_path_from_dentry(direntry);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000344 if ((fromName == NULL) || (toName == NULL)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 rc = -ENOMEM;
346 goto cifs_hl_exit;
347 }
348
Steve Frenchc18c8422007-07-18 23:21:09 +0000349 if (pTcon->unix_ext)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
Jeff Layton7ffec372010-09-29 19:51:11 -0400351 cifs_sb->local_nls,
352 cifs_sb->mnt_cifs_flags &
Steve French737b7582005-04-28 22:41:06 -0700353 CIFS_MOUNT_MAP_SPECIAL_CHR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 else {
355 rc = CIFSCreateHardLink(xid, pTcon, fromName, toName,
Jeff Layton7ffec372010-09-29 19:51:11 -0400356 cifs_sb->local_nls,
357 cifs_sb->mnt_cifs_flags &
Steve French737b7582005-04-28 22:41:06 -0700358 CIFS_MOUNT_MAP_SPECIAL_CHR);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000359 if ((rc == -EIO) || (rc == -EINVAL))
360 rc = -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 }
362
Steve French31ec35d2006-11-16 20:54:20 +0000363 d_drop(direntry); /* force new lookup from server of target */
364
365 /* if source file is cached (oplocked) revalidate will not go to server
366 until the file is closed or oplock broken so update nlinks locally */
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000367 if (old_file->d_inode) {
Steve French31ec35d2006-11-16 20:54:20 +0000368 cifsInode = CIFS_I(old_file->d_inode);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000369 if (rc == 0) {
Steve French31ec35d2006-11-16 20:54:20 +0000370 old_file->d_inode->i_nlink++;
Steve French1b2b2122007-02-17 04:30:54 +0000371/* BB should we make this contingent on superblock flag NOATIME? */
372/* old_file->d_inode->i_ctime = CURRENT_TIME;*/
Steve French31ec35d2006-11-16 20:54:20 +0000373 /* parent dir timestamps will update from srv
374 within a second, would it really be worth it
375 to set the parent dir cifs inode time to zero
376 to force revalidate (faster) for it too? */
377 }
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000378 /* if not oplocked will force revalidate to get info
Steve French31ec35d2006-11-16 20:54:20 +0000379 on source file from srv */
380 cifsInode->time = 0;
381
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000382 /* Will update parent dir timestamps from srv within a second.
Steve French31ec35d2006-11-16 20:54:20 +0000383 Would it really be worth it to set the parent dir (cifs
384 inode) time field to zero to force revalidate on parent
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000385 directory faster ie
Steve French31ec35d2006-11-16 20:54:20 +0000386 CIFS_I(inode)->time = 0; */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
389cifs_hl_exit:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800390 kfree(fromName);
391 kfree(toName);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 FreeXid(xid);
Jeff Layton7ffec372010-09-29 19:51:11 -0400393 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 return rc;
395}
396
Linus Torvaldscc314ee2005-08-19 18:02:56 -0700397void *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
399{
400 struct inode *inode = direntry->d_inode;
Jeff Layton8b6427a2009-05-19 09:57:03 -0400401 int rc = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 int xid;
403 char *full_path = NULL;
Jeff Layton8b6427a2009-05-19 09:57:03 -0400404 char *target_path = NULL;
405 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
Jeff Layton7ffec372010-09-29 19:51:11 -0400406 struct tcon_link *tlink = NULL;
407 struct cifsTconInfo *tcon;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
409 xid = GetXid();
410
Jeff Layton7ffec372010-09-29 19:51:11 -0400411 tlink = cifs_sb_tlink(cifs_sb);
412 if (IS_ERR(tlink)) {
413 rc = PTR_ERR(tlink);
414 tlink = NULL;
415 goto out;
416 }
417 tcon = tlink_tcon(tlink);
418
Jeff Layton8b6427a2009-05-19 09:57:03 -0400419 /*
420 * For now, we just handle symlinks with unix extensions enabled.
421 * Eventually we should handle NTFS reparse points, and MacOS
422 * symlink support. For instance...
423 *
424 * rc = CIFSSMBQueryReparseLinkInfo(...)
425 *
426 * For now, just return -EACCES when the server doesn't support posix
427 * extensions. Note that we still allow querying symlinks when posix
428 * extensions are manually disabled. We could disable these as well
429 * but there doesn't seem to be any harm in allowing the client to
430 * read them.
431 */
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200432 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
433 && !(tcon->ses->capabilities & CAP_UNIX)) {
Jeff Layton8b6427a2009-05-19 09:57:03 -0400434 rc = -EACCES;
435 goto out;
436 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
Jeff Layton8b6427a2009-05-19 09:57:03 -0400438 full_path = build_path_from_dentry(direntry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 if (!full_path)
Jeff Layton460b9692009-04-30 07:17:56 -0400440 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
Joe Perchesb6b38f72010-04-21 03:50:45 +0000442 cFYI(1, "Full path: %s inode = 0x%p", full_path, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200444 rc = -EACCES;
445 /*
446 * First try Minshall+French Symlinks, if configured
447 * and fallback to UNIX Extensions Symlinks.
448 */
449 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
450 rc = CIFSQueryMFSymLink(xid, tcon, full_path, &target_path,
451 cifs_sb->local_nls,
452 cifs_sb->mnt_cifs_flags &
453 CIFS_MOUNT_MAP_SPECIAL_CHR);
454
455 if ((rc != 0) && (tcon->ses->capabilities & CAP_UNIX))
456 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
457 cifs_sb->local_nls);
458
Jeff Layton8b6427a2009-05-19 09:57:03 -0400459 kfree(full_path);
460out:
Jeff Layton460b9692009-04-30 07:17:56 -0400461 if (rc != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 kfree(target_path);
463 target_path = ERR_PTR(rc);
464 }
465
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 FreeXid(xid);
Jeff Layton7ffec372010-09-29 19:51:11 -0400467 if (tlink)
468 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 nd_set_link(nd, target_path);
Jeff Layton460b9692009-04-30 07:17:56 -0400470 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471}
472
473int
474cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
475{
476 int rc = -EOPNOTSUPP;
477 int xid;
Jeff Layton7ffec372010-09-29 19:51:11 -0400478 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
479 struct tcon_link *tlink;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 struct cifsTconInfo *pTcon;
481 char *full_path = NULL;
482 struct inode *newinode = NULL;
483
484 xid = GetXid();
485
Jeff Layton7ffec372010-09-29 19:51:11 -0400486 tlink = cifs_sb_tlink(cifs_sb);
487 if (IS_ERR(tlink)) {
488 rc = PTR_ERR(tlink);
489 goto symlink_exit;
490 }
491 pTcon = tlink_tcon(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
Steve French7f573562005-08-30 11:32:14 -0700493 full_path = build_path_from_dentry(direntry);
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000494 if (full_path == NULL) {
Suresh Jayaraman0f3bc092009-06-25 18:12:34 +0530495 rc = -ENOMEM;
Jeff Layton7ffec372010-09-29 19:51:11 -0400496 goto symlink_exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 }
498
Joe Perchesb6b38f72010-04-21 03:50:45 +0000499 cFYI(1, "Full path: %s", full_path);
500 cFYI(1, "symname is %s", symname);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501
502 /* BB what if DFS and this volume is on different share? BB */
Stefan Metzmacher1b12b9c2010-08-05 21:19:56 +0200503 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
504 rc = CIFSCreateMFSymLink(xid, pTcon, full_path, symname,
505 cifs_sb->local_nls,
506 cifs_sb->mnt_cifs_flags &
507 CIFS_MOUNT_MAP_SPECIAL_CHR);
508 else if (pTcon->unix_ext)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
510 cifs_sb->local_nls);
511 /* else
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000512 rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
513 cifs_sb_target->local_nls); */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515 if (rc == 0) {
Steve Frenchc18c8422007-07-18 23:21:09 +0000516 if (pTcon->unix_ext)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 rc = cifs_get_inode_info_unix(&newinode, full_path,
Steve Frenchfb8c4b12007-07-10 01:16:18 +0000518 inode->i_sb, xid);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 else
520 rc = cifs_get_inode_info(&newinode, full_path, NULL,
Steve French8b1327f2008-03-14 22:37:16 +0000521 inode->i_sb, xid, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523 if (rc != 0) {
Joe Perchesb6b38f72010-04-21 03:50:45 +0000524 cFYI(1, "Create symlink ok, getinodeinfo fail rc = %d",
525 rc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 } else {
Steve Frenchb92327f2005-08-22 20:09:43 -0700527 if (pTcon->nocase)
528 direntry->d_op = &cifs_ci_dentry_ops;
529 else
530 direntry->d_op = &cifs_dentry_ops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 d_instantiate(direntry, newinode);
532 }
533 }
Jeff Layton7ffec372010-09-29 19:51:11 -0400534symlink_exit:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800535 kfree(full_path);
Jeff Layton7ffec372010-09-29 19:51:11 -0400536 cifs_put_tlink(tlink);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 FreeXid(xid);
538 return rc;
539}
540
Linus Torvaldscc314ee2005-08-19 18:02:56 -0700541void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542{
543 char *p = nd_get_link(nd);
544 if (!IS_ERR(p))
545 kfree(p);
546}