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1 | /* | |
2 | * fs/cifs/link.c | |
3 | * | |
4 | * Copyright (C) International Business Machines Corp., 2002,2008 | |
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/slab.h> | |
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" | |
31 | #include "cifs_unicode.h" | |
32 | #ifdef CONFIG_CIFS_SMB2 | |
33 | #include "smb2proto.h" | |
34 | #endif | |
35 | ||
36 | /* | |
37 | * M-F Symlink Functions - Begin | |
38 | */ | |
39 | ||
40 | #define CIFS_MF_SYMLINK_LEN_OFFSET (4+1) | |
41 | #define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1)) | |
42 | #define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1)) | |
43 | #define CIFS_MF_SYMLINK_LINK_MAXLEN (1024) | |
44 | #define CIFS_MF_SYMLINK_FILE_SIZE \ | |
45 | (CIFS_MF_SYMLINK_LINK_OFFSET + CIFS_MF_SYMLINK_LINK_MAXLEN) | |
46 | ||
47 | #define CIFS_MF_SYMLINK_LEN_FORMAT "XSym\n%04u\n" | |
48 | #define CIFS_MF_SYMLINK_MD5_FORMAT "%16phN\n" | |
49 | #define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) md5_hash | |
50 | ||
51 | static int | |
52 | symlink_hash(unsigned int link_len, const char *link_str, u8 *md5_hash) | |
53 | { | |
54 | int rc; | |
55 | unsigned int size; | |
56 | struct crypto_shash *md5; | |
57 | struct sdesc *sdescmd5; | |
58 | ||
59 | md5 = crypto_alloc_shash("md5", 0, 0); | |
60 | if (IS_ERR(md5)) { | |
61 | rc = PTR_ERR(md5); | |
62 | cifs_dbg(VFS, "%s: Crypto md5 allocation error %d\n", | |
63 | __func__, rc); | |
64 | return rc; | |
65 | } | |
66 | size = sizeof(struct shash_desc) + crypto_shash_descsize(md5); | |
67 | sdescmd5 = kmalloc(size, GFP_KERNEL); | |
68 | if (!sdescmd5) { | |
69 | rc = -ENOMEM; | |
70 | goto symlink_hash_err; | |
71 | } | |
72 | sdescmd5->shash.tfm = md5; | |
73 | sdescmd5->shash.flags = 0x0; | |
74 | ||
75 | rc = crypto_shash_init(&sdescmd5->shash); | |
76 | if (rc) { | |
77 | cifs_dbg(VFS, "%s: Could not init md5 shash\n", __func__); | |
78 | goto symlink_hash_err; | |
79 | } | |
80 | rc = crypto_shash_update(&sdescmd5->shash, link_str, link_len); | |
81 | if (rc) { | |
82 | cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__); | |
83 | goto symlink_hash_err; | |
84 | } | |
85 | rc = crypto_shash_final(&sdescmd5->shash, md5_hash); | |
86 | if (rc) | |
87 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); | |
88 | ||
89 | symlink_hash_err: | |
90 | crypto_free_shash(md5); | |
91 | kfree(sdescmd5); | |
92 | ||
93 | return rc; | |
94 | } | |
95 | ||
96 | static int | |
97 | parse_mf_symlink(const u8 *buf, unsigned int buf_len, unsigned int *_link_len, | |
98 | char **_link_str) | |
99 | { | |
100 | int rc; | |
101 | unsigned int link_len; | |
102 | const char *md5_str1; | |
103 | const char *link_str; | |
104 | u8 md5_hash[16]; | |
105 | char md5_str2[34]; | |
106 | ||
107 | if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE) | |
108 | return -EINVAL; | |
109 | ||
110 | md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET]; | |
111 | link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET]; | |
112 | ||
113 | rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len); | |
114 | if (rc != 1) | |
115 | return -EINVAL; | |
116 | ||
117 | rc = symlink_hash(link_len, link_str, md5_hash); | |
118 | if (rc) { | |
119 | cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc); | |
120 | return rc; | |
121 | } | |
122 | ||
123 | snprintf(md5_str2, sizeof(md5_str2), | |
124 | CIFS_MF_SYMLINK_MD5_FORMAT, | |
125 | CIFS_MF_SYMLINK_MD5_ARGS(md5_hash)); | |
126 | ||
127 | if (strncmp(md5_str1, md5_str2, 17) != 0) | |
128 | return -EINVAL; | |
129 | ||
130 | if (_link_str) { | |
131 | *_link_str = kstrndup(link_str, link_len, GFP_KERNEL); | |
132 | if (!*_link_str) | |
133 | return -ENOMEM; | |
134 | } | |
135 | ||
136 | *_link_len = link_len; | |
137 | return 0; | |
138 | } | |
139 | ||
140 | static int | |
141 | format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str) | |
142 | { | |
143 | int rc; | |
144 | unsigned int link_len; | |
145 | unsigned int ofs; | |
146 | u8 md5_hash[16]; | |
147 | ||
148 | if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE) | |
149 | return -EINVAL; | |
150 | ||
151 | link_len = strlen(link_str); | |
152 | ||
153 | if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN) | |
154 | return -ENAMETOOLONG; | |
155 | ||
156 | rc = symlink_hash(link_len, link_str, md5_hash); | |
157 | if (rc) { | |
158 | cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc); | |
159 | return rc; | |
160 | } | |
161 | ||
162 | snprintf(buf, buf_len, | |
163 | CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT, | |
164 | link_len, | |
165 | CIFS_MF_SYMLINK_MD5_ARGS(md5_hash)); | |
166 | ||
167 | ofs = CIFS_MF_SYMLINK_LINK_OFFSET; | |
168 | memcpy(buf + ofs, link_str, link_len); | |
169 | ||
170 | ofs += link_len; | |
171 | if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) { | |
172 | buf[ofs] = '\n'; | |
173 | ofs++; | |
174 | } | |
175 | ||
176 | while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) { | |
177 | buf[ofs] = ' '; | |
178 | ofs++; | |
179 | } | |
180 | ||
181 | return 0; | |
182 | } | |
183 | ||
184 | bool | |
185 | couldbe_mf_symlink(const struct cifs_fattr *fattr) | |
186 | { | |
187 | if (!S_ISREG(fattr->cf_mode)) | |
188 | /* it's not a symlink */ | |
189 | return false; | |
190 | ||
191 | if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE) | |
192 | /* it's not a symlink */ | |
193 | return false; | |
194 | ||
195 | return true; | |
196 | } | |
197 | ||
198 | static int | |
199 | create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon, | |
200 | struct cifs_sb_info *cifs_sb, const char *fromName, | |
201 | const char *toName) | |
202 | { | |
203 | int rc; | |
204 | u8 *buf; | |
205 | unsigned int bytes_written = 0; | |
206 | ||
207 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
208 | if (!buf) | |
209 | return -ENOMEM; | |
210 | ||
211 | rc = format_mf_symlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName); | |
212 | if (rc) | |
213 | goto out; | |
214 | ||
215 | if (tcon->ses->server->ops->create_mf_symlink) | |
216 | rc = tcon->ses->server->ops->create_mf_symlink(xid, tcon, | |
217 | cifs_sb, fromName, buf, &bytes_written); | |
218 | else | |
219 | rc = -EOPNOTSUPP; | |
220 | ||
221 | if (rc) | |
222 | goto out; | |
223 | ||
224 | if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE) | |
225 | rc = -EIO; | |
226 | out: | |
227 | kfree(buf); | |
228 | return rc; | |
229 | } | |
230 | ||
231 | static int | |
232 | query_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon, | |
233 | struct cifs_sb_info *cifs_sb, const unsigned char *path, | |
234 | char **symlinkinfo) | |
235 | { | |
236 | int rc; | |
237 | u8 *buf = NULL; | |
238 | unsigned int link_len = 0; | |
239 | unsigned int bytes_read = 0; | |
240 | ||
241 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
242 | if (!buf) | |
243 | return -ENOMEM; | |
244 | ||
245 | if (tcon->ses->server->ops->query_mf_symlink) | |
246 | rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon, | |
247 | cifs_sb, path, buf, &bytes_read); | |
248 | else | |
249 | rc = -ENOSYS; | |
250 | ||
251 | if (rc) | |
252 | goto out; | |
253 | ||
254 | if (bytes_read == 0) { /* not a symlink */ | |
255 | rc = -EINVAL; | |
256 | goto out; | |
257 | } | |
258 | ||
259 | rc = parse_mf_symlink(buf, bytes_read, &link_len, symlinkinfo); | |
260 | out: | |
261 | kfree(buf); | |
262 | return rc; | |
263 | } | |
264 | ||
265 | int | |
266 | check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, | |
267 | struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr, | |
268 | const unsigned char *path) | |
269 | { | |
270 | int rc; | |
271 | u8 *buf = NULL; | |
272 | unsigned int link_len = 0; | |
273 | unsigned int bytes_read = 0; | |
274 | ||
275 | if (!couldbe_mf_symlink(fattr)) | |
276 | /* it's not a symlink */ | |
277 | return 0; | |
278 | ||
279 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
280 | if (!buf) | |
281 | return -ENOMEM; | |
282 | ||
283 | if (tcon->ses->server->ops->query_mf_symlink) | |
284 | rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon, | |
285 | cifs_sb, path, buf, &bytes_read); | |
286 | else | |
287 | rc = -ENOSYS; | |
288 | ||
289 | if (rc) | |
290 | goto out; | |
291 | ||
292 | if (bytes_read == 0) /* not a symlink */ | |
293 | goto out; | |
294 | ||
295 | rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL); | |
296 | if (rc == -EINVAL) { | |
297 | /* it's not a symlink */ | |
298 | rc = 0; | |
299 | goto out; | |
300 | } | |
301 | ||
302 | if (rc != 0) | |
303 | goto out; | |
304 | ||
305 | /* it is a symlink */ | |
306 | fattr->cf_eof = link_len; | |
307 | fattr->cf_mode &= ~S_IFMT; | |
308 | fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO; | |
309 | fattr->cf_dtype = DT_LNK; | |
310 | out: | |
311 | kfree(buf); | |
312 | return rc; | |
313 | } | |
314 | ||
315 | /* | |
316 | * SMB 1.0 Protocol specific functions | |
317 | */ | |
318 | ||
319 | int | |
320 | cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, | |
321 | struct cifs_sb_info *cifs_sb, const unsigned char *path, | |
322 | char *pbuf, unsigned int *pbytes_read) | |
323 | { | |
324 | int rc; | |
325 | int oplock = 0; | |
326 | struct cifs_fid fid; | |
327 | struct cifs_open_parms oparms; | |
328 | struct cifs_io_parms io_parms; | |
329 | int buf_type = CIFS_NO_BUFFER; | |
330 | FILE_ALL_INFO file_info; | |
331 | ||
332 | oparms.tcon = tcon; | |
333 | oparms.cifs_sb = cifs_sb; | |
334 | oparms.desired_access = GENERIC_READ; | |
335 | oparms.create_options = CREATE_NOT_DIR; | |
336 | oparms.disposition = FILE_OPEN; | |
337 | oparms.path = path; | |
338 | oparms.fid = &fid; | |
339 | oparms.reconnect = false; | |
340 | ||
341 | rc = CIFS_open(xid, &oparms, &oplock, &file_info); | |
342 | if (rc) | |
343 | return rc; | |
344 | ||
345 | if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) { | |
346 | rc = -ENOENT; | |
347 | /* it's not a symlink */ | |
348 | goto out; | |
349 | } | |
350 | ||
351 | io_parms.netfid = fid.netfid; | |
352 | io_parms.pid = current->tgid; | |
353 | io_parms.tcon = tcon; | |
354 | io_parms.offset = 0; | |
355 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
356 | ||
357 | rc = CIFSSMBRead(xid, &io_parms, pbytes_read, &pbuf, &buf_type); | |
358 | out: | |
359 | CIFSSMBClose(xid, tcon, fid.netfid); | |
360 | return rc; | |
361 | } | |
362 | ||
363 | int | |
364 | cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, | |
365 | struct cifs_sb_info *cifs_sb, const unsigned char *path, | |
366 | char *pbuf, unsigned int *pbytes_written) | |
367 | { | |
368 | int rc; | |
369 | int oplock = 0; | |
370 | struct cifs_fid fid; | |
371 | struct cifs_open_parms oparms; | |
372 | struct cifs_io_parms io_parms; | |
373 | int create_options = CREATE_NOT_DIR; | |
374 | ||
375 | if (backup_cred(cifs_sb)) | |
376 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
377 | ||
378 | oparms.tcon = tcon; | |
379 | oparms.cifs_sb = cifs_sb; | |
380 | oparms.desired_access = GENERIC_WRITE; | |
381 | oparms.create_options = create_options; | |
382 | oparms.disposition = FILE_CREATE; | |
383 | oparms.path = path; | |
384 | oparms.fid = &fid; | |
385 | oparms.reconnect = false; | |
386 | ||
387 | rc = CIFS_open(xid, &oparms, &oplock, NULL); | |
388 | if (rc) | |
389 | return rc; | |
390 | ||
391 | io_parms.netfid = fid.netfid; | |
392 | io_parms.pid = current->tgid; | |
393 | io_parms.tcon = tcon; | |
394 | io_parms.offset = 0; | |
395 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
396 | ||
397 | rc = CIFSSMBWrite(xid, &io_parms, pbytes_written, pbuf); | |
398 | CIFSSMBClose(xid, tcon, fid.netfid); | |
399 | return rc; | |
400 | } | |
401 | ||
402 | /* | |
403 | * SMB 2.1/SMB3 Protocol specific functions | |
404 | */ | |
405 | #ifdef CONFIG_CIFS_SMB2 | |
406 | int | |
407 | smb3_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, | |
408 | struct cifs_sb_info *cifs_sb, const unsigned char *path, | |
409 | char *pbuf, unsigned int *pbytes_read) | |
410 | { | |
411 | int rc; | |
412 | struct cifs_fid fid; | |
413 | struct cifs_open_parms oparms; | |
414 | struct cifs_io_parms io_parms; | |
415 | int buf_type = CIFS_NO_BUFFER; | |
416 | __le16 *utf16_path; | |
417 | __u8 oplock = SMB2_OPLOCK_LEVEL_II; | |
418 | struct smb2_file_all_info *pfile_info = NULL; | |
419 | ||
420 | oparms.tcon = tcon; | |
421 | oparms.cifs_sb = cifs_sb; | |
422 | oparms.desired_access = GENERIC_READ; | |
423 | oparms.create_options = CREATE_NOT_DIR; | |
424 | if (backup_cred(cifs_sb)) | |
425 | oparms.create_options |= CREATE_OPEN_BACKUP_INTENT; | |
426 | oparms.disposition = FILE_OPEN; | |
427 | oparms.fid = &fid; | |
428 | oparms.reconnect = false; | |
429 | ||
430 | utf16_path = cifs_convert_path_to_utf16(path, cifs_sb); | |
431 | if (utf16_path == NULL) | |
432 | return -ENOMEM; | |
433 | ||
434 | pfile_info = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2, | |
435 | GFP_KERNEL); | |
436 | ||
437 | if (pfile_info == NULL) { | |
438 | kfree(utf16_path); | |
439 | return -ENOMEM; | |
440 | } | |
441 | ||
442 | rc = SMB2_open(xid, &oparms, utf16_path, &oplock, pfile_info, NULL); | |
443 | if (rc) | |
444 | goto qmf_out_open_fail; | |
445 | ||
446 | if (pfile_info->EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) { | |
447 | /* it's not a symlink */ | |
448 | rc = -ENOENT; /* Is there a better rc to return? */ | |
449 | goto qmf_out; | |
450 | } | |
451 | ||
452 | io_parms.netfid = fid.netfid; | |
453 | io_parms.pid = current->tgid; | |
454 | io_parms.tcon = tcon; | |
455 | io_parms.offset = 0; | |
456 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
457 | io_parms.persistent_fid = fid.persistent_fid; | |
458 | io_parms.volatile_fid = fid.volatile_fid; | |
459 | rc = SMB2_read(xid, &io_parms, pbytes_read, &pbuf, &buf_type); | |
460 | qmf_out: | |
461 | SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid); | |
462 | qmf_out_open_fail: | |
463 | kfree(utf16_path); | |
464 | kfree(pfile_info); | |
465 | return rc; | |
466 | } | |
467 | ||
468 | int | |
469 | smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, | |
470 | struct cifs_sb_info *cifs_sb, const unsigned char *path, | |
471 | char *pbuf, unsigned int *pbytes_written) | |
472 | { | |
473 | int rc; | |
474 | struct cifs_fid fid; | |
475 | struct cifs_open_parms oparms; | |
476 | struct cifs_io_parms io_parms; | |
477 | int create_options = CREATE_NOT_DIR; | |
478 | __le16 *utf16_path; | |
479 | __u8 oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE; | |
480 | struct kvec iov[2]; | |
481 | ||
482 | if (backup_cred(cifs_sb)) | |
483 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
484 | ||
485 | cifs_dbg(FYI, "%s: path: %s\n", __func__, path); | |
486 | ||
487 | utf16_path = cifs_convert_path_to_utf16(path, cifs_sb); | |
488 | if (!utf16_path) | |
489 | return -ENOMEM; | |
490 | ||
491 | oparms.tcon = tcon; | |
492 | oparms.cifs_sb = cifs_sb; | |
493 | oparms.desired_access = GENERIC_WRITE; | |
494 | oparms.create_options = create_options; | |
495 | oparms.disposition = FILE_CREATE; | |
496 | oparms.fid = &fid; | |
497 | oparms.reconnect = false; | |
498 | ||
499 | rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL); | |
500 | if (rc) { | |
501 | kfree(utf16_path); | |
502 | return rc; | |
503 | } | |
504 | ||
505 | io_parms.netfid = fid.netfid; | |
506 | io_parms.pid = current->tgid; | |
507 | io_parms.tcon = tcon; | |
508 | io_parms.offset = 0; | |
509 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
510 | io_parms.persistent_fid = fid.persistent_fid; | |
511 | io_parms.volatile_fid = fid.volatile_fid; | |
512 | ||
513 | /* iov[0] is reserved for smb header */ | |
514 | iov[1].iov_base = pbuf; | |
515 | iov[1].iov_len = CIFS_MF_SYMLINK_FILE_SIZE; | |
516 | ||
517 | rc = SMB2_write(xid, &io_parms, pbytes_written, iov, 1); | |
518 | ||
519 | /* Make sure we wrote all of the symlink data */ | |
520 | if ((rc == 0) && (*pbytes_written != CIFS_MF_SYMLINK_FILE_SIZE)) | |
521 | rc = -EIO; | |
522 | ||
523 | SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid); | |
524 | ||
525 | kfree(utf16_path); | |
526 | return rc; | |
527 | } | |
528 | #endif /* CONFIG_CIFS_SMB2 */ | |
529 | ||
530 | /* | |
531 | * M-F Symlink Functions - End | |
532 | */ | |
533 | ||
534 | int | |
535 | cifs_hardlink(struct dentry *old_file, struct inode *inode, | |
536 | struct dentry *direntry) | |
537 | { | |
538 | int rc = -EACCES; | |
539 | unsigned int xid; | |
540 | char *from_name = NULL; | |
541 | char *to_name = NULL; | |
542 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
543 | struct tcon_link *tlink; | |
544 | struct cifs_tcon *tcon; | |
545 | struct TCP_Server_Info *server; | |
546 | struct cifsInodeInfo *cifsInode; | |
547 | ||
548 | tlink = cifs_sb_tlink(cifs_sb); | |
549 | if (IS_ERR(tlink)) | |
550 | return PTR_ERR(tlink); | |
551 | tcon = tlink_tcon(tlink); | |
552 | ||
553 | xid = get_xid(); | |
554 | ||
555 | from_name = build_path_from_dentry(old_file); | |
556 | to_name = build_path_from_dentry(direntry); | |
557 | if ((from_name == NULL) || (to_name == NULL)) { | |
558 | rc = -ENOMEM; | |
559 | goto cifs_hl_exit; | |
560 | } | |
561 | ||
562 | if (tcon->unix_ext) | |
563 | rc = CIFSUnixCreateHardLink(xid, tcon, from_name, to_name, | |
564 | cifs_sb->local_nls, | |
565 | cifs_remap(cifs_sb)); | |
566 | else { | |
567 | server = tcon->ses->server; | |
568 | if (!server->ops->create_hardlink) { | |
569 | rc = -ENOSYS; | |
570 | goto cifs_hl_exit; | |
571 | } | |
572 | rc = server->ops->create_hardlink(xid, tcon, from_name, to_name, | |
573 | cifs_sb); | |
574 | if ((rc == -EIO) || (rc == -EINVAL)) | |
575 | rc = -EOPNOTSUPP; | |
576 | } | |
577 | ||
578 | d_drop(direntry); /* force new lookup from server of target */ | |
579 | ||
580 | /* | |
581 | * if source file is cached (oplocked) revalidate will not go to server | |
582 | * until the file is closed or oplock broken so update nlinks locally | |
583 | */ | |
584 | if (d_really_is_positive(old_file)) { | |
585 | cifsInode = CIFS_I(d_inode(old_file)); | |
586 | if (rc == 0) { | |
587 | spin_lock(&d_inode(old_file)->i_lock); | |
588 | inc_nlink(d_inode(old_file)); | |
589 | spin_unlock(&d_inode(old_file)->i_lock); | |
590 | ||
591 | /* | |
592 | * parent dir timestamps will update from srv within a | |
593 | * second, would it really be worth it to set the parent | |
594 | * dir cifs inode time to zero to force revalidate | |
595 | * (faster) for it too? | |
596 | */ | |
597 | } | |
598 | /* | |
599 | * if not oplocked will force revalidate to get info on source | |
600 | * file from srv. Note Samba server prior to 4.2 has bug - | |
601 | * not updating src file ctime on hardlinks but Windows servers | |
602 | * handle it properly | |
603 | */ | |
604 | cifsInode->time = 0; | |
605 | ||
606 | /* | |
607 | * Will update parent dir timestamps from srv within a second. | |
608 | * Would it really be worth it to set the parent dir (cifs | |
609 | * inode) time field to zero to force revalidate on parent | |
610 | * directory faster ie | |
611 | * | |
612 | * CIFS_I(inode)->time = 0; | |
613 | */ | |
614 | } | |
615 | ||
616 | cifs_hl_exit: | |
617 | kfree(from_name); | |
618 | kfree(to_name); | |
619 | free_xid(xid); | |
620 | cifs_put_tlink(tlink); | |
621 | return rc; | |
622 | } | |
623 | ||
624 | const char * | |
625 | cifs_get_link(struct dentry *direntry, struct inode *inode, | |
626 | struct delayed_call *done) | |
627 | { | |
628 | int rc = -ENOMEM; | |
629 | unsigned int xid; | |
630 | char *full_path = NULL; | |
631 | char *target_path = NULL; | |
632 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
633 | struct tcon_link *tlink = NULL; | |
634 | struct cifs_tcon *tcon; | |
635 | struct TCP_Server_Info *server; | |
636 | ||
637 | if (!direntry) | |
638 | return ERR_PTR(-ECHILD); | |
639 | ||
640 | xid = get_xid(); | |
641 | ||
642 | tlink = cifs_sb_tlink(cifs_sb); | |
643 | if (IS_ERR(tlink)) { | |
644 | free_xid(xid); | |
645 | return ERR_CAST(tlink); | |
646 | } | |
647 | tcon = tlink_tcon(tlink); | |
648 | server = tcon->ses->server; | |
649 | ||
650 | full_path = build_path_from_dentry(direntry); | |
651 | if (!full_path) { | |
652 | free_xid(xid); | |
653 | cifs_put_tlink(tlink); | |
654 | return ERR_PTR(-ENOMEM); | |
655 | } | |
656 | ||
657 | cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", full_path, inode); | |
658 | ||
659 | rc = -EACCES; | |
660 | /* | |
661 | * First try Minshall+French Symlinks, if configured | |
662 | * and fallback to UNIX Extensions Symlinks. | |
663 | */ | |
664 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) | |
665 | rc = query_mf_symlink(xid, tcon, cifs_sb, full_path, | |
666 | &target_path); | |
667 | ||
668 | if (rc != 0 && server->ops->query_symlink) | |
669 | rc = server->ops->query_symlink(xid, tcon, full_path, | |
670 | &target_path, cifs_sb); | |
671 | ||
672 | kfree(full_path); | |
673 | free_xid(xid); | |
674 | cifs_put_tlink(tlink); | |
675 | if (rc != 0) { | |
676 | kfree(target_path); | |
677 | return ERR_PTR(rc); | |
678 | } | |
679 | set_delayed_call(done, kfree_link, target_path); | |
680 | return target_path; | |
681 | } | |
682 | ||
683 | int | |
684 | cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname) | |
685 | { | |
686 | int rc = -EOPNOTSUPP; | |
687 | unsigned int xid; | |
688 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
689 | struct tcon_link *tlink; | |
690 | struct cifs_tcon *pTcon; | |
691 | char *full_path = NULL; | |
692 | struct inode *newinode = NULL; | |
693 | ||
694 | xid = get_xid(); | |
695 | ||
696 | tlink = cifs_sb_tlink(cifs_sb); | |
697 | if (IS_ERR(tlink)) { | |
698 | rc = PTR_ERR(tlink); | |
699 | goto symlink_exit; | |
700 | } | |
701 | pTcon = tlink_tcon(tlink); | |
702 | ||
703 | full_path = build_path_from_dentry(direntry); | |
704 | if (full_path == NULL) { | |
705 | rc = -ENOMEM; | |
706 | goto symlink_exit; | |
707 | } | |
708 | ||
709 | cifs_dbg(FYI, "Full path: %s\n", full_path); | |
710 | cifs_dbg(FYI, "symname is %s\n", symname); | |
711 | ||
712 | /* BB what if DFS and this volume is on different share? BB */ | |
713 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) | |
714 | rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname); | |
715 | else if (pTcon->unix_ext) | |
716 | rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname, | |
717 | cifs_sb->local_nls, | |
718 | cifs_remap(cifs_sb)); | |
719 | /* else | |
720 | rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName, | |
721 | cifs_sb_target->local_nls); */ | |
722 | ||
723 | if (rc == 0) { | |
724 | if (pTcon->unix_ext) | |
725 | rc = cifs_get_inode_info_unix(&newinode, full_path, | |
726 | inode->i_sb, xid); | |
727 | else | |
728 | rc = cifs_get_inode_info(&newinode, full_path, NULL, | |
729 | inode->i_sb, xid, NULL); | |
730 | ||
731 | if (rc != 0) { | |
732 | cifs_dbg(FYI, "Create symlink ok, getinodeinfo fail rc = %d\n", | |
733 | rc); | |
734 | } else { | |
735 | d_instantiate(direntry, newinode); | |
736 | } | |
737 | } | |
738 | symlink_exit: | |
739 | kfree(full_path); | |
740 | cifs_put_tlink(tlink); | |
741 | free_xid(xid); | |
742 | return rc; | |
743 | } |