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1da177e4 LT |
1 | /* |
2 | * fs/cifs/link.c | |
3 | * | |
366781c1 | 4 | * Copyright (C) International Business Machines Corp., 2002,2008 |
1da177e4 LT |
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> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
1da177e4 LT |
24 | #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" | |
c69c1b6e SM |
31 | |
32 | #define CIFS_MF_SYMLINK_LEN_OFFSET (4+1) | |
33 | #define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1)) | |
34 | #define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1)) | |
35 | #define CIFS_MF_SYMLINK_LINK_MAXLEN (1024) | |
36 | #define CIFS_MF_SYMLINK_FILE_SIZE \ | |
37 | (CIFS_MF_SYMLINK_LINK_OFFSET + CIFS_MF_SYMLINK_LINK_MAXLEN) | |
38 | ||
39 | #define CIFS_MF_SYMLINK_LEN_FORMAT "XSym\n%04u\n" | |
40 | #define CIFS_MF_SYMLINK_MD5_FORMAT \ | |
41 | "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n" | |
42 | #define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) \ | |
43 | md5_hash[0], md5_hash[1], md5_hash[2], md5_hash[3], \ | |
44 | md5_hash[4], md5_hash[5], md5_hash[6], md5_hash[7], \ | |
45 | md5_hash[8], md5_hash[9], md5_hash[10], md5_hash[11],\ | |
46 | md5_hash[12], md5_hash[13], md5_hash[14], md5_hash[15] | |
47 | ||
93c100c0 SF |
48 | static int |
49 | symlink_hash(unsigned int link_len, const char *link_str, u8 *md5_hash) | |
50 | { | |
51 | int rc; | |
52 | unsigned int size; | |
53 | struct crypto_shash *md5; | |
54 | struct sdesc *sdescmd5; | |
55 | ||
56 | md5 = crypto_alloc_shash("md5", 0, 0); | |
ee2c9258 | 57 | if (IS_ERR(md5)) { |
ffeb414a | 58 | rc = PTR_ERR(md5); |
93c100c0 | 59 | cERROR(1, "%s: Crypto md5 allocation error %d\n", __func__, rc); |
ffeb414a | 60 | return rc; |
93c100c0 SF |
61 | } |
62 | size = sizeof(struct shash_desc) + crypto_shash_descsize(md5); | |
63 | sdescmd5 = kmalloc(size, GFP_KERNEL); | |
64 | if (!sdescmd5) { | |
65 | rc = -ENOMEM; | |
66 | cERROR(1, "%s: Memory allocation failure\n", __func__); | |
67 | goto symlink_hash_err; | |
68 | } | |
69 | sdescmd5->shash.tfm = md5; | |
70 | sdescmd5->shash.flags = 0x0; | |
71 | ||
72 | rc = crypto_shash_init(&sdescmd5->shash); | |
73 | if (rc) { | |
74 | cERROR(1, "%s: Could not init md5 shash\n", __func__); | |
75 | goto symlink_hash_err; | |
76 | } | |
77 | crypto_shash_update(&sdescmd5->shash, link_str, link_len); | |
78 | rc = crypto_shash_final(&sdescmd5->shash, md5_hash); | |
79 | ||
80 | symlink_hash_err: | |
81 | crypto_free_shash(md5); | |
82 | kfree(sdescmd5); | |
83 | ||
84 | return rc; | |
85 | } | |
86 | ||
c69c1b6e SM |
87 | static int |
88 | CIFSParseMFSymlink(const u8 *buf, | |
89 | unsigned int buf_len, | |
90 | unsigned int *_link_len, | |
91 | char **_link_str) | |
92 | { | |
93 | int rc; | |
94 | unsigned int link_len; | |
95 | const char *md5_str1; | |
96 | const char *link_str; | |
c69c1b6e SM |
97 | u8 md5_hash[16]; |
98 | char md5_str2[34]; | |
99 | ||
100 | if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE) | |
101 | return -EINVAL; | |
102 | ||
103 | md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET]; | |
104 | link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET]; | |
105 | ||
106 | rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len); | |
107 | if (rc != 1) | |
108 | return -EINVAL; | |
109 | ||
93c100c0 SF |
110 | rc = symlink_hash(link_len, link_str, md5_hash); |
111 | if (rc) { | |
112 | cFYI(1, "%s: MD5 hash failure: %d\n", __func__, rc); | |
113 | return rc; | |
114 | } | |
c69c1b6e SM |
115 | |
116 | snprintf(md5_str2, sizeof(md5_str2), | |
117 | CIFS_MF_SYMLINK_MD5_FORMAT, | |
118 | CIFS_MF_SYMLINK_MD5_ARGS(md5_hash)); | |
119 | ||
120 | if (strncmp(md5_str1, md5_str2, 17) != 0) | |
121 | return -EINVAL; | |
122 | ||
123 | if (_link_str) { | |
124 | *_link_str = kstrndup(link_str, link_len, GFP_KERNEL); | |
125 | if (!*_link_str) | |
126 | return -ENOMEM; | |
127 | } | |
128 | ||
129 | *_link_len = link_len; | |
130 | return 0; | |
131 | } | |
1da177e4 | 132 | |
0fd43ae4 | 133 | static int |
18bddd10 SM |
134 | CIFSFormatMFSymlink(u8 *buf, unsigned int buf_len, const char *link_str) |
135 | { | |
93c100c0 | 136 | int rc; |
18bddd10 SM |
137 | unsigned int link_len; |
138 | unsigned int ofs; | |
18bddd10 SM |
139 | u8 md5_hash[16]; |
140 | ||
141 | if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE) | |
142 | return -EINVAL; | |
143 | ||
144 | link_len = strlen(link_str); | |
145 | ||
146 | if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN) | |
147 | return -ENAMETOOLONG; | |
148 | ||
93c100c0 SF |
149 | rc = symlink_hash(link_len, link_str, md5_hash); |
150 | if (rc) { | |
151 | cFYI(1, "%s: MD5 hash failure: %d\n", __func__, rc); | |
152 | return rc; | |
153 | } | |
18bddd10 SM |
154 | |
155 | snprintf(buf, buf_len, | |
156 | CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT, | |
157 | link_len, | |
158 | CIFS_MF_SYMLINK_MD5_ARGS(md5_hash)); | |
159 | ||
160 | ofs = CIFS_MF_SYMLINK_LINK_OFFSET; | |
161 | memcpy(buf + ofs, link_str, link_len); | |
162 | ||
163 | ofs += link_len; | |
164 | if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) { | |
165 | buf[ofs] = '\n'; | |
166 | ofs++; | |
167 | } | |
168 | ||
169 | while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) { | |
170 | buf[ofs] = ' '; | |
171 | ofs++; | |
172 | } | |
173 | ||
174 | return 0; | |
175 | } | |
176 | ||
8713d01d SM |
177 | static int |
178 | CIFSCreateMFSymLink(const int xid, struct cifsTconInfo *tcon, | |
179 | const char *fromName, const char *toName, | |
180 | const struct nls_table *nls_codepage, int remap) | |
181 | { | |
182 | int rc; | |
183 | int oplock = 0; | |
184 | __u16 netfid = 0; | |
185 | u8 *buf; | |
186 | unsigned int bytes_written = 0; | |
fa2989f4 | 187 | struct cifs_io_parms io_parms; |
8713d01d SM |
188 | |
189 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
190 | if (!buf) | |
191 | return -ENOMEM; | |
192 | ||
193 | rc = CIFSFormatMFSymlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName); | |
194 | if (rc != 0) { | |
195 | kfree(buf); | |
196 | return rc; | |
197 | } | |
198 | ||
199 | rc = CIFSSMBOpen(xid, tcon, fromName, FILE_CREATE, GENERIC_WRITE, | |
200 | CREATE_NOT_DIR, &netfid, &oplock, NULL, | |
201 | nls_codepage, remap); | |
202 | if (rc != 0) { | |
203 | kfree(buf); | |
204 | return rc; | |
205 | } | |
206 | ||
fa2989f4 PS |
207 | io_parms.netfid = netfid; |
208 | io_parms.pid = current->tgid; | |
209 | io_parms.tcon = tcon; | |
210 | io_parms.offset = 0; | |
211 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
212 | ||
213 | rc = CIFSSMBWrite(xid, &io_parms, &bytes_written, buf, NULL, 0); | |
8713d01d SM |
214 | CIFSSMBClose(xid, tcon, netfid); |
215 | kfree(buf); | |
216 | if (rc != 0) | |
217 | return rc; | |
218 | ||
219 | if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE) | |
220 | return -EIO; | |
221 | ||
222 | return 0; | |
223 | } | |
224 | ||
225 | static int | |
0fd43ae4 SM |
226 | CIFSQueryMFSymLink(const int xid, struct cifsTconInfo *tcon, |
227 | const unsigned char *searchName, char **symlinkinfo, | |
228 | const struct nls_table *nls_codepage, int remap) | |
229 | { | |
230 | int rc; | |
231 | int oplock = 0; | |
232 | __u16 netfid = 0; | |
233 | u8 *buf; | |
234 | char *pbuf; | |
235 | unsigned int bytes_read = 0; | |
236 | int buf_type = CIFS_NO_BUFFER; | |
237 | unsigned int link_len = 0; | |
d4ffff1f | 238 | struct cifs_io_parms io_parms; |
0fd43ae4 SM |
239 | FILE_ALL_INFO file_info; |
240 | ||
241 | rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ, | |
242 | CREATE_NOT_DIR, &netfid, &oplock, &file_info, | |
243 | nls_codepage, remap); | |
244 | if (rc != 0) | |
245 | return rc; | |
246 | ||
5443d130 | 247 | if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) { |
0fd43ae4 SM |
248 | CIFSSMBClose(xid, tcon, netfid); |
249 | /* it's not a symlink */ | |
250 | return -EINVAL; | |
251 | } | |
252 | ||
253 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
254 | if (!buf) | |
255 | return -ENOMEM; | |
256 | pbuf = buf; | |
d4ffff1f PS |
257 | io_parms.netfid = netfid; |
258 | io_parms.pid = current->tgid; | |
259 | io_parms.tcon = tcon; | |
260 | io_parms.offset = 0; | |
261 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
0fd43ae4 | 262 | |
d4ffff1f | 263 | rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type); |
0fd43ae4 SM |
264 | CIFSSMBClose(xid, tcon, netfid); |
265 | if (rc != 0) { | |
266 | kfree(buf); | |
267 | return rc; | |
268 | } | |
269 | ||
270 | rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, symlinkinfo); | |
271 | kfree(buf); | |
272 | if (rc != 0) | |
273 | return rc; | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
8bfb50a8 SM |
278 | bool |
279 | CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr) | |
280 | { | |
281 | if (!(fattr->cf_mode & S_IFREG)) | |
282 | /* it's not a symlink */ | |
283 | return false; | |
284 | ||
285 | if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE) | |
286 | /* it's not a symlink */ | |
287 | return false; | |
288 | ||
289 | return true; | |
290 | } | |
291 | ||
292 | int | |
293 | CIFSCheckMFSymlink(struct cifs_fattr *fattr, | |
294 | const unsigned char *path, | |
295 | struct cifs_sb_info *cifs_sb, int xid) | |
296 | { | |
297 | int rc; | |
298 | int oplock = 0; | |
299 | __u16 netfid = 0; | |
7ffec372 JL |
300 | struct tcon_link *tlink; |
301 | struct cifsTconInfo *pTcon; | |
d4ffff1f | 302 | struct cifs_io_parms io_parms; |
8bfb50a8 SM |
303 | u8 *buf; |
304 | char *pbuf; | |
305 | unsigned int bytes_read = 0; | |
306 | int buf_type = CIFS_NO_BUFFER; | |
307 | unsigned int link_len = 0; | |
308 | FILE_ALL_INFO file_info; | |
309 | ||
310 | if (!CIFSCouldBeMFSymlink(fattr)) | |
311 | /* it's not a symlink */ | |
312 | return 0; | |
313 | ||
7ffec372 JL |
314 | tlink = cifs_sb_tlink(cifs_sb); |
315 | if (IS_ERR(tlink)) | |
316 | return PTR_ERR(tlink); | |
317 | pTcon = tlink_tcon(tlink); | |
318 | ||
8bfb50a8 SM |
319 | rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ, |
320 | CREATE_NOT_DIR, &netfid, &oplock, &file_info, | |
321 | cifs_sb->local_nls, | |
322 | cifs_sb->mnt_cifs_flags & | |
323 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
324 | if (rc != 0) | |
7ffec372 | 325 | goto out; |
8bfb50a8 | 326 | |
5443d130 | 327 | if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) { |
8bfb50a8 SM |
328 | CIFSSMBClose(xid, pTcon, netfid); |
329 | /* it's not a symlink */ | |
7ffec372 | 330 | goto out; |
8bfb50a8 SM |
331 | } |
332 | ||
333 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
7ffec372 JL |
334 | if (!buf) { |
335 | rc = -ENOMEM; | |
336 | goto out; | |
337 | } | |
8bfb50a8 | 338 | pbuf = buf; |
d4ffff1f PS |
339 | io_parms.netfid = netfid; |
340 | io_parms.pid = current->tgid; | |
341 | io_parms.tcon = pTcon; | |
342 | io_parms.offset = 0; | |
343 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
8bfb50a8 | 344 | |
d4ffff1f | 345 | rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type); |
8bfb50a8 SM |
346 | CIFSSMBClose(xid, pTcon, netfid); |
347 | if (rc != 0) { | |
348 | kfree(buf); | |
7ffec372 | 349 | goto out; |
8bfb50a8 SM |
350 | } |
351 | ||
352 | rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, NULL); | |
353 | kfree(buf); | |
7ffec372 | 354 | if (rc == -EINVAL) { |
8bfb50a8 | 355 | /* it's not a symlink */ |
7ffec372 JL |
356 | rc = 0; |
357 | goto out; | |
358 | } | |
359 | ||
8bfb50a8 | 360 | if (rc != 0) |
7ffec372 | 361 | goto out; |
8bfb50a8 SM |
362 | |
363 | /* it is a symlink */ | |
364 | fattr->cf_eof = link_len; | |
365 | fattr->cf_mode &= ~S_IFMT; | |
366 | fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO; | |
367 | fattr->cf_dtype = DT_LNK; | |
7ffec372 JL |
368 | out: |
369 | cifs_put_tlink(tlink); | |
370 | return rc; | |
8bfb50a8 SM |
371 | } |
372 | ||
1da177e4 LT |
373 | int |
374 | cifs_hardlink(struct dentry *old_file, struct inode *inode, | |
375 | struct dentry *direntry) | |
376 | { | |
377 | int rc = -EACCES; | |
378 | int xid; | |
379 | char *fromName = NULL; | |
380 | char *toName = NULL; | |
7ffec372 JL |
381 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
382 | struct tcon_link *tlink; | |
1da177e4 LT |
383 | struct cifsTconInfo *pTcon; |
384 | struct cifsInodeInfo *cifsInode; | |
385 | ||
7ffec372 JL |
386 | tlink = cifs_sb_tlink(cifs_sb); |
387 | if (IS_ERR(tlink)) | |
388 | return PTR_ERR(tlink); | |
389 | pTcon = tlink_tcon(tlink); | |
1da177e4 | 390 | |
7ffec372 | 391 | xid = GetXid(); |
1da177e4 | 392 | |
7f57356b SF |
393 | fromName = build_path_from_dentry(old_file); |
394 | toName = build_path_from_dentry(direntry); | |
fb8c4b14 | 395 | if ((fromName == NULL) || (toName == NULL)) { |
1da177e4 LT |
396 | rc = -ENOMEM; |
397 | goto cifs_hl_exit; | |
398 | } | |
399 | ||
c18c842b | 400 | if (pTcon->unix_ext) |
1da177e4 | 401 | rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName, |
7ffec372 JL |
402 | cifs_sb->local_nls, |
403 | cifs_sb->mnt_cifs_flags & | |
737b758c | 404 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
405 | else { |
406 | rc = CIFSCreateHardLink(xid, pTcon, fromName, toName, | |
7ffec372 JL |
407 | cifs_sb->local_nls, |
408 | cifs_sb->mnt_cifs_flags & | |
737b758c | 409 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
fb8c4b14 SF |
410 | if ((rc == -EIO) || (rc == -EINVAL)) |
411 | rc = -EOPNOTSUPP; | |
1da177e4 LT |
412 | } |
413 | ||
31ec35d6 SF |
414 | d_drop(direntry); /* force new lookup from server of target */ |
415 | ||
416 | /* if source file is cached (oplocked) revalidate will not go to server | |
417 | until the file is closed or oplock broken so update nlinks locally */ | |
fb8c4b14 | 418 | if (old_file->d_inode) { |
31ec35d6 | 419 | cifsInode = CIFS_I(old_file->d_inode); |
fb8c4b14 | 420 | if (rc == 0) { |
31ec35d6 | 421 | old_file->d_inode->i_nlink++; |
1b2b2126 SF |
422 | /* BB should we make this contingent on superblock flag NOATIME? */ |
423 | /* old_file->d_inode->i_ctime = CURRENT_TIME;*/ | |
31ec35d6 SF |
424 | /* parent dir timestamps will update from srv |
425 | within a second, would it really be worth it | |
426 | to set the parent dir cifs inode time to zero | |
427 | to force revalidate (faster) for it too? */ | |
428 | } | |
fb8c4b14 | 429 | /* if not oplocked will force revalidate to get info |
31ec35d6 SF |
430 | on source file from srv */ |
431 | cifsInode->time = 0; | |
432 | ||
fb8c4b14 | 433 | /* Will update parent dir timestamps from srv within a second. |
31ec35d6 SF |
434 | Would it really be worth it to set the parent dir (cifs |
435 | inode) time field to zero to force revalidate on parent | |
fb8c4b14 | 436 | directory faster ie |
31ec35d6 | 437 | CIFS_I(inode)->time = 0; */ |
1da177e4 | 438 | } |
1da177e4 LT |
439 | |
440 | cifs_hl_exit: | |
f99d49ad JJ |
441 | kfree(fromName); |
442 | kfree(toName); | |
1da177e4 | 443 | FreeXid(xid); |
7ffec372 | 444 | cifs_put_tlink(tlink); |
1da177e4 LT |
445 | return rc; |
446 | } | |
447 | ||
cc314eef | 448 | void * |
1da177e4 LT |
449 | cifs_follow_link(struct dentry *direntry, struct nameidata *nd) |
450 | { | |
451 | struct inode *inode = direntry->d_inode; | |
8b6427a2 | 452 | int rc = -ENOMEM; |
1da177e4 LT |
453 | int xid; |
454 | char *full_path = NULL; | |
8b6427a2 JL |
455 | char *target_path = NULL; |
456 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
457 | struct tcon_link *tlink = NULL; |
458 | struct cifsTconInfo *tcon; | |
1da177e4 LT |
459 | |
460 | xid = GetXid(); | |
461 | ||
7ffec372 JL |
462 | tlink = cifs_sb_tlink(cifs_sb); |
463 | if (IS_ERR(tlink)) { | |
464 | rc = PTR_ERR(tlink); | |
465 | tlink = NULL; | |
466 | goto out; | |
467 | } | |
468 | tcon = tlink_tcon(tlink); | |
469 | ||
8b6427a2 JL |
470 | /* |
471 | * For now, we just handle symlinks with unix extensions enabled. | |
472 | * Eventually we should handle NTFS reparse points, and MacOS | |
473 | * symlink support. For instance... | |
474 | * | |
475 | * rc = CIFSSMBQueryReparseLinkInfo(...) | |
476 | * | |
477 | * For now, just return -EACCES when the server doesn't support posix | |
478 | * extensions. Note that we still allow querying symlinks when posix | |
479 | * extensions are manually disabled. We could disable these as well | |
480 | * but there doesn't seem to be any harm in allowing the client to | |
481 | * read them. | |
482 | */ | |
1b12b9c1 SM |
483 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) |
484 | && !(tcon->ses->capabilities & CAP_UNIX)) { | |
8b6427a2 JL |
485 | rc = -EACCES; |
486 | goto out; | |
487 | } | |
1da177e4 | 488 | |
8b6427a2 | 489 | full_path = build_path_from_dentry(direntry); |
1da177e4 | 490 | if (!full_path) |
460b9696 | 491 | goto out; |
1da177e4 | 492 | |
b6b38f70 | 493 | cFYI(1, "Full path: %s inode = 0x%p", full_path, inode); |
1da177e4 | 494 | |
1b12b9c1 SM |
495 | rc = -EACCES; |
496 | /* | |
497 | * First try Minshall+French Symlinks, if configured | |
498 | * and fallback to UNIX Extensions Symlinks. | |
499 | */ | |
500 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) | |
501 | rc = CIFSQueryMFSymLink(xid, tcon, full_path, &target_path, | |
502 | cifs_sb->local_nls, | |
503 | cifs_sb->mnt_cifs_flags & | |
504 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
505 | ||
506 | if ((rc != 0) && (tcon->ses->capabilities & CAP_UNIX)) | |
507 | rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path, | |
508 | cifs_sb->local_nls); | |
509 | ||
8b6427a2 JL |
510 | kfree(full_path); |
511 | out: | |
460b9696 | 512 | if (rc != 0) { |
1da177e4 LT |
513 | kfree(target_path); |
514 | target_path = ERR_PTR(rc); | |
515 | } | |
516 | ||
1da177e4 | 517 | FreeXid(xid); |
7ffec372 JL |
518 | if (tlink) |
519 | cifs_put_tlink(tlink); | |
1da177e4 | 520 | nd_set_link(nd, target_path); |
460b9696 | 521 | return NULL; |
1da177e4 LT |
522 | } |
523 | ||
524 | int | |
525 | cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname) | |
526 | { | |
527 | int rc = -EOPNOTSUPP; | |
528 | int xid; | |
7ffec372 JL |
529 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
530 | struct tcon_link *tlink; | |
1da177e4 LT |
531 | struct cifsTconInfo *pTcon; |
532 | char *full_path = NULL; | |
533 | struct inode *newinode = NULL; | |
534 | ||
535 | xid = GetXid(); | |
536 | ||
7ffec372 JL |
537 | tlink = cifs_sb_tlink(cifs_sb); |
538 | if (IS_ERR(tlink)) { | |
539 | rc = PTR_ERR(tlink); | |
540 | goto symlink_exit; | |
541 | } | |
542 | pTcon = tlink_tcon(tlink); | |
1da177e4 | 543 | |
7f57356b | 544 | full_path = build_path_from_dentry(direntry); |
fb8c4b14 | 545 | if (full_path == NULL) { |
0f3bc09e | 546 | rc = -ENOMEM; |
7ffec372 | 547 | goto symlink_exit; |
1da177e4 LT |
548 | } |
549 | ||
b6b38f70 JP |
550 | cFYI(1, "Full path: %s", full_path); |
551 | cFYI(1, "symname is %s", symname); | |
1da177e4 LT |
552 | |
553 | /* BB what if DFS and this volume is on different share? BB */ | |
1b12b9c1 SM |
554 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) |
555 | rc = CIFSCreateMFSymLink(xid, pTcon, full_path, symname, | |
556 | cifs_sb->local_nls, | |
557 | cifs_sb->mnt_cifs_flags & | |
558 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
559 | else if (pTcon->unix_ext) | |
1da177e4 LT |
560 | rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname, |
561 | cifs_sb->local_nls); | |
562 | /* else | |
fb8c4b14 SF |
563 | rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName, |
564 | cifs_sb_target->local_nls); */ | |
1da177e4 LT |
565 | |
566 | if (rc == 0) { | |
c18c842b | 567 | if (pTcon->unix_ext) |
1da177e4 | 568 | rc = cifs_get_inode_info_unix(&newinode, full_path, |
fb8c4b14 | 569 | inode->i_sb, xid); |
1da177e4 LT |
570 | else |
571 | rc = cifs_get_inode_info(&newinode, full_path, NULL, | |
8b1327f6 | 572 | inode->i_sb, xid, NULL); |
1da177e4 LT |
573 | |
574 | if (rc != 0) { | |
b6b38f70 JP |
575 | cFYI(1, "Create symlink ok, getinodeinfo fail rc = %d", |
576 | rc); | |
1da177e4 | 577 | } else { |
1da177e4 LT |
578 | d_instantiate(direntry, newinode); |
579 | } | |
580 | } | |
7ffec372 | 581 | symlink_exit: |
f99d49ad | 582 | kfree(full_path); |
7ffec372 | 583 | cifs_put_tlink(tlink); |
1da177e4 LT |
584 | FreeXid(xid); |
585 | return rc; | |
586 | } | |
587 | ||
cc314eef | 588 | void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie) |
1da177e4 LT |
589 | { |
590 | char *p = nd_get_link(nd); | |
591 | if (!IS_ERR(p)) | |
592 | kfree(p); | |
593 | } |