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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); | |
57 | if (!md5 || IS_ERR(md5)) { | |
58 | rc = PTR_ERR(md5); | |
59 | cERROR(1, "%s: Crypto md5 allocation error %d\n", __func__, rc); | |
60 | return rc; | |
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; | |
187 | ||
188 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
189 | if (!buf) | |
190 | return -ENOMEM; | |
191 | ||
192 | rc = CIFSFormatMFSymlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName); | |
193 | if (rc != 0) { | |
194 | kfree(buf); | |
195 | return rc; | |
196 | } | |
197 | ||
198 | rc = CIFSSMBOpen(xid, tcon, fromName, FILE_CREATE, GENERIC_WRITE, | |
199 | CREATE_NOT_DIR, &netfid, &oplock, NULL, | |
200 | nls_codepage, remap); | |
201 | if (rc != 0) { | |
202 | kfree(buf); | |
203 | return rc; | |
204 | } | |
205 | ||
206 | rc = CIFSSMBWrite(xid, tcon, netfid, | |
207 | CIFS_MF_SYMLINK_FILE_SIZE /* length */, | |
208 | 0 /* offset */, | |
209 | &bytes_written, buf, NULL, 0); | |
210 | CIFSSMBClose(xid, tcon, netfid); | |
211 | kfree(buf); | |
212 | if (rc != 0) | |
213 | return rc; | |
214 | ||
215 | if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE) | |
216 | return -EIO; | |
217 | ||
218 | return 0; | |
219 | } | |
220 | ||
221 | static int | |
0fd43ae4 SM |
222 | CIFSQueryMFSymLink(const int xid, struct cifsTconInfo *tcon, |
223 | const unsigned char *searchName, char **symlinkinfo, | |
224 | const struct nls_table *nls_codepage, int remap) | |
225 | { | |
226 | int rc; | |
227 | int oplock = 0; | |
228 | __u16 netfid = 0; | |
229 | u8 *buf; | |
230 | char *pbuf; | |
231 | unsigned int bytes_read = 0; | |
232 | int buf_type = CIFS_NO_BUFFER; | |
233 | unsigned int link_len = 0; | |
234 | FILE_ALL_INFO file_info; | |
235 | ||
236 | rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ, | |
237 | CREATE_NOT_DIR, &netfid, &oplock, &file_info, | |
238 | nls_codepage, remap); | |
239 | if (rc != 0) | |
240 | return rc; | |
241 | ||
242 | if (file_info.EndOfFile != CIFS_MF_SYMLINK_FILE_SIZE) { | |
243 | CIFSSMBClose(xid, tcon, netfid); | |
244 | /* it's not a symlink */ | |
245 | return -EINVAL; | |
246 | } | |
247 | ||
248 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
249 | if (!buf) | |
250 | return -ENOMEM; | |
251 | pbuf = buf; | |
252 | ||
253 | rc = CIFSSMBRead(xid, tcon, netfid, | |
254 | CIFS_MF_SYMLINK_FILE_SIZE /* length */, | |
255 | 0 /* offset */, | |
256 | &bytes_read, &pbuf, &buf_type); | |
257 | CIFSSMBClose(xid, tcon, netfid); | |
258 | if (rc != 0) { | |
259 | kfree(buf); | |
260 | return rc; | |
261 | } | |
262 | ||
263 | rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, symlinkinfo); | |
264 | kfree(buf); | |
265 | if (rc != 0) | |
266 | return rc; | |
267 | ||
268 | return 0; | |
269 | } | |
270 | ||
8bfb50a8 SM |
271 | bool |
272 | CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr) | |
273 | { | |
274 | if (!(fattr->cf_mode & S_IFREG)) | |
275 | /* it's not a symlink */ | |
276 | return false; | |
277 | ||
278 | if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE) | |
279 | /* it's not a symlink */ | |
280 | return false; | |
281 | ||
282 | return true; | |
283 | } | |
284 | ||
285 | int | |
286 | CIFSCheckMFSymlink(struct cifs_fattr *fattr, | |
287 | const unsigned char *path, | |
288 | struct cifs_sb_info *cifs_sb, int xid) | |
289 | { | |
290 | int rc; | |
291 | int oplock = 0; | |
292 | __u16 netfid = 0; | |
7ffec372 JL |
293 | struct tcon_link *tlink; |
294 | struct cifsTconInfo *pTcon; | |
8bfb50a8 SM |
295 | u8 *buf; |
296 | char *pbuf; | |
297 | unsigned int bytes_read = 0; | |
298 | int buf_type = CIFS_NO_BUFFER; | |
299 | unsigned int link_len = 0; | |
300 | FILE_ALL_INFO file_info; | |
301 | ||
302 | if (!CIFSCouldBeMFSymlink(fattr)) | |
303 | /* it's not a symlink */ | |
304 | return 0; | |
305 | ||
7ffec372 JL |
306 | tlink = cifs_sb_tlink(cifs_sb); |
307 | if (IS_ERR(tlink)) | |
308 | return PTR_ERR(tlink); | |
309 | pTcon = tlink_tcon(tlink); | |
310 | ||
8bfb50a8 SM |
311 | rc = CIFSSMBOpen(xid, pTcon, path, FILE_OPEN, GENERIC_READ, |
312 | CREATE_NOT_DIR, &netfid, &oplock, &file_info, | |
313 | cifs_sb->local_nls, | |
314 | cifs_sb->mnt_cifs_flags & | |
315 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
316 | if (rc != 0) | |
7ffec372 | 317 | goto out; |
8bfb50a8 SM |
318 | |
319 | if (file_info.EndOfFile != CIFS_MF_SYMLINK_FILE_SIZE) { | |
320 | CIFSSMBClose(xid, pTcon, netfid); | |
321 | /* it's not a symlink */ | |
7ffec372 | 322 | goto out; |
8bfb50a8 SM |
323 | } |
324 | ||
325 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
7ffec372 JL |
326 | if (!buf) { |
327 | rc = -ENOMEM; | |
328 | goto out; | |
329 | } | |
8bfb50a8 SM |
330 | pbuf = buf; |
331 | ||
332 | rc = CIFSSMBRead(xid, pTcon, netfid, | |
333 | CIFS_MF_SYMLINK_FILE_SIZE /* length */, | |
334 | 0 /* offset */, | |
335 | &bytes_read, &pbuf, &buf_type); | |
336 | CIFSSMBClose(xid, pTcon, netfid); | |
337 | if (rc != 0) { | |
338 | kfree(buf); | |
7ffec372 | 339 | goto out; |
8bfb50a8 SM |
340 | } |
341 | ||
342 | rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, NULL); | |
343 | kfree(buf); | |
7ffec372 | 344 | if (rc == -EINVAL) { |
8bfb50a8 | 345 | /* it's not a symlink */ |
7ffec372 JL |
346 | rc = 0; |
347 | goto out; | |
348 | } | |
349 | ||
8bfb50a8 | 350 | if (rc != 0) |
7ffec372 | 351 | goto out; |
8bfb50a8 SM |
352 | |
353 | /* it is a symlink */ | |
354 | fattr->cf_eof = link_len; | |
355 | fattr->cf_mode &= ~S_IFMT; | |
356 | fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO; | |
357 | fattr->cf_dtype = DT_LNK; | |
7ffec372 JL |
358 | out: |
359 | cifs_put_tlink(tlink); | |
360 | return rc; | |
8bfb50a8 SM |
361 | } |
362 | ||
1da177e4 LT |
363 | int |
364 | cifs_hardlink(struct dentry *old_file, struct inode *inode, | |
365 | struct dentry *direntry) | |
366 | { | |
367 | int rc = -EACCES; | |
368 | int xid; | |
369 | char *fromName = NULL; | |
370 | char *toName = NULL; | |
7ffec372 JL |
371 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
372 | struct tcon_link *tlink; | |
1da177e4 LT |
373 | struct cifsTconInfo *pTcon; |
374 | struct cifsInodeInfo *cifsInode; | |
375 | ||
7ffec372 JL |
376 | tlink = cifs_sb_tlink(cifs_sb); |
377 | if (IS_ERR(tlink)) | |
378 | return PTR_ERR(tlink); | |
379 | pTcon = tlink_tcon(tlink); | |
1da177e4 | 380 | |
7ffec372 | 381 | xid = GetXid(); |
1da177e4 | 382 | |
7f57356b SF |
383 | fromName = build_path_from_dentry(old_file); |
384 | toName = build_path_from_dentry(direntry); | |
fb8c4b14 | 385 | if ((fromName == NULL) || (toName == NULL)) { |
1da177e4 LT |
386 | rc = -ENOMEM; |
387 | goto cifs_hl_exit; | |
388 | } | |
389 | ||
c18c842b | 390 | if (pTcon->unix_ext) |
1da177e4 | 391 | rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName, |
7ffec372 JL |
392 | cifs_sb->local_nls, |
393 | cifs_sb->mnt_cifs_flags & | |
737b758c | 394 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 LT |
395 | else { |
396 | rc = CIFSCreateHardLink(xid, pTcon, fromName, toName, | |
7ffec372 JL |
397 | cifs_sb->local_nls, |
398 | cifs_sb->mnt_cifs_flags & | |
737b758c | 399 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
fb8c4b14 SF |
400 | if ((rc == -EIO) || (rc == -EINVAL)) |
401 | rc = -EOPNOTSUPP; | |
1da177e4 LT |
402 | } |
403 | ||
31ec35d6 SF |
404 | d_drop(direntry); /* force new lookup from server of target */ |
405 | ||
406 | /* if source file is cached (oplocked) revalidate will not go to server | |
407 | until the file is closed or oplock broken so update nlinks locally */ | |
fb8c4b14 | 408 | if (old_file->d_inode) { |
31ec35d6 | 409 | cifsInode = CIFS_I(old_file->d_inode); |
fb8c4b14 | 410 | if (rc == 0) { |
31ec35d6 | 411 | old_file->d_inode->i_nlink++; |
1b2b2126 SF |
412 | /* BB should we make this contingent on superblock flag NOATIME? */ |
413 | /* old_file->d_inode->i_ctime = CURRENT_TIME;*/ | |
31ec35d6 SF |
414 | /* parent dir timestamps will update from srv |
415 | within a second, would it really be worth it | |
416 | to set the parent dir cifs inode time to zero | |
417 | to force revalidate (faster) for it too? */ | |
418 | } | |
fb8c4b14 | 419 | /* if not oplocked will force revalidate to get info |
31ec35d6 SF |
420 | on source file from srv */ |
421 | cifsInode->time = 0; | |
422 | ||
fb8c4b14 | 423 | /* Will update parent dir timestamps from srv within a second. |
31ec35d6 SF |
424 | Would it really be worth it to set the parent dir (cifs |
425 | inode) time field to zero to force revalidate on parent | |
fb8c4b14 | 426 | directory faster ie |
31ec35d6 | 427 | CIFS_I(inode)->time = 0; */ |
1da177e4 | 428 | } |
1da177e4 LT |
429 | |
430 | cifs_hl_exit: | |
f99d49ad JJ |
431 | kfree(fromName); |
432 | kfree(toName); | |
1da177e4 | 433 | FreeXid(xid); |
7ffec372 | 434 | cifs_put_tlink(tlink); |
1da177e4 LT |
435 | return rc; |
436 | } | |
437 | ||
cc314eef | 438 | void * |
1da177e4 LT |
439 | cifs_follow_link(struct dentry *direntry, struct nameidata *nd) |
440 | { | |
441 | struct inode *inode = direntry->d_inode; | |
8b6427a2 | 442 | int rc = -ENOMEM; |
1da177e4 LT |
443 | int xid; |
444 | char *full_path = NULL; | |
8b6427a2 JL |
445 | char *target_path = NULL; |
446 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 JL |
447 | struct tcon_link *tlink = NULL; |
448 | struct cifsTconInfo *tcon; | |
1da177e4 LT |
449 | |
450 | xid = GetXid(); | |
451 | ||
7ffec372 JL |
452 | tlink = cifs_sb_tlink(cifs_sb); |
453 | if (IS_ERR(tlink)) { | |
454 | rc = PTR_ERR(tlink); | |
455 | tlink = NULL; | |
456 | goto out; | |
457 | } | |
458 | tcon = tlink_tcon(tlink); | |
459 | ||
8b6427a2 JL |
460 | /* |
461 | * For now, we just handle symlinks with unix extensions enabled. | |
462 | * Eventually we should handle NTFS reparse points, and MacOS | |
463 | * symlink support. For instance... | |
464 | * | |
465 | * rc = CIFSSMBQueryReparseLinkInfo(...) | |
466 | * | |
467 | * For now, just return -EACCES when the server doesn't support posix | |
468 | * extensions. Note that we still allow querying symlinks when posix | |
469 | * extensions are manually disabled. We could disable these as well | |
470 | * but there doesn't seem to be any harm in allowing the client to | |
471 | * read them. | |
472 | */ | |
1b12b9c1 SM |
473 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) |
474 | && !(tcon->ses->capabilities & CAP_UNIX)) { | |
8b6427a2 JL |
475 | rc = -EACCES; |
476 | goto out; | |
477 | } | |
1da177e4 | 478 | |
8b6427a2 | 479 | full_path = build_path_from_dentry(direntry); |
1da177e4 | 480 | if (!full_path) |
460b9696 | 481 | goto out; |
1da177e4 | 482 | |
b6b38f70 | 483 | cFYI(1, "Full path: %s inode = 0x%p", full_path, inode); |
1da177e4 | 484 | |
1b12b9c1 SM |
485 | rc = -EACCES; |
486 | /* | |
487 | * First try Minshall+French Symlinks, if configured | |
488 | * and fallback to UNIX Extensions Symlinks. | |
489 | */ | |
490 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) | |
491 | rc = CIFSQueryMFSymLink(xid, tcon, full_path, &target_path, | |
492 | cifs_sb->local_nls, | |
493 | cifs_sb->mnt_cifs_flags & | |
494 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
495 | ||
496 | if ((rc != 0) && (tcon->ses->capabilities & CAP_UNIX)) | |
497 | rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path, | |
498 | cifs_sb->local_nls); | |
499 | ||
8b6427a2 JL |
500 | kfree(full_path); |
501 | out: | |
460b9696 | 502 | if (rc != 0) { |
1da177e4 LT |
503 | kfree(target_path); |
504 | target_path = ERR_PTR(rc); | |
505 | } | |
506 | ||
1da177e4 | 507 | FreeXid(xid); |
7ffec372 JL |
508 | if (tlink) |
509 | cifs_put_tlink(tlink); | |
1da177e4 | 510 | nd_set_link(nd, target_path); |
460b9696 | 511 | return NULL; |
1da177e4 LT |
512 | } |
513 | ||
514 | int | |
515 | cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname) | |
516 | { | |
517 | int rc = -EOPNOTSUPP; | |
518 | int xid; | |
7ffec372 JL |
519 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
520 | struct tcon_link *tlink; | |
1da177e4 LT |
521 | struct cifsTconInfo *pTcon; |
522 | char *full_path = NULL; | |
523 | struct inode *newinode = NULL; | |
524 | ||
525 | xid = GetXid(); | |
526 | ||
7ffec372 JL |
527 | tlink = cifs_sb_tlink(cifs_sb); |
528 | if (IS_ERR(tlink)) { | |
529 | rc = PTR_ERR(tlink); | |
530 | goto symlink_exit; | |
531 | } | |
532 | pTcon = tlink_tcon(tlink); | |
1da177e4 | 533 | |
7f57356b | 534 | full_path = build_path_from_dentry(direntry); |
fb8c4b14 | 535 | if (full_path == NULL) { |
0f3bc09e | 536 | rc = -ENOMEM; |
7ffec372 | 537 | goto symlink_exit; |
1da177e4 LT |
538 | } |
539 | ||
b6b38f70 JP |
540 | cFYI(1, "Full path: %s", full_path); |
541 | cFYI(1, "symname is %s", symname); | |
1da177e4 LT |
542 | |
543 | /* BB what if DFS and this volume is on different share? BB */ | |
1b12b9c1 SM |
544 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) |
545 | rc = CIFSCreateMFSymLink(xid, pTcon, full_path, symname, | |
546 | cifs_sb->local_nls, | |
547 | cifs_sb->mnt_cifs_flags & | |
548 | CIFS_MOUNT_MAP_SPECIAL_CHR); | |
549 | else if (pTcon->unix_ext) | |
1da177e4 LT |
550 | rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname, |
551 | cifs_sb->local_nls); | |
552 | /* else | |
fb8c4b14 SF |
553 | rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName, |
554 | cifs_sb_target->local_nls); */ | |
1da177e4 LT |
555 | |
556 | if (rc == 0) { | |
c18c842b | 557 | if (pTcon->unix_ext) |
1da177e4 | 558 | rc = cifs_get_inode_info_unix(&newinode, full_path, |
fb8c4b14 | 559 | inode->i_sb, xid); |
1da177e4 LT |
560 | else |
561 | rc = cifs_get_inode_info(&newinode, full_path, NULL, | |
8b1327f6 | 562 | inode->i_sb, xid, NULL); |
1da177e4 LT |
563 | |
564 | if (rc != 0) { | |
b6b38f70 JP |
565 | cFYI(1, "Create symlink ok, getinodeinfo fail rc = %d", |
566 | rc); | |
1da177e4 | 567 | } else { |
1da177e4 LT |
568 | d_instantiate(direntry, newinode); |
569 | } | |
570 | } | |
7ffec372 | 571 | symlink_exit: |
f99d49ad | 572 | kfree(full_path); |
7ffec372 | 573 | cifs_put_tlink(tlink); |
1da177e4 LT |
574 | FreeXid(xid); |
575 | return rc; | |
576 | } | |
577 | ||
cc314eef | 578 | void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie) |
1da177e4 LT |
579 | { |
580 | char *p = nd_get_link(nd); | |
581 | if (!IS_ERR(p)) | |
582 | kfree(p); | |
583 | } |