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Commit | Line | Data |
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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" | |
2baa2682 | 31 | #include "cifs_unicode.h" |
5ab97578 | 32 | #include "smb2proto.h" |
c69c1b6e | 33 | |
0f8dce1c SP |
34 | /* |
35 | * M-F Symlink Functions - Begin | |
36 | */ | |
37 | ||
c69c1b6e SM |
38 | #define CIFS_MF_SYMLINK_LEN_OFFSET (4+1) |
39 | #define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1)) | |
40 | #define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1)) | |
41 | #define CIFS_MF_SYMLINK_LINK_MAXLEN (1024) | |
42 | #define CIFS_MF_SYMLINK_FILE_SIZE \ | |
43 | (CIFS_MF_SYMLINK_LINK_OFFSET + CIFS_MF_SYMLINK_LINK_MAXLEN) | |
44 | ||
45 | #define CIFS_MF_SYMLINK_LEN_FORMAT "XSym\n%04u\n" | |
c6fc663e RV |
46 | #define CIFS_MF_SYMLINK_MD5_FORMAT "%16phN\n" |
47 | #define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) md5_hash | |
c69c1b6e | 48 | |
93c100c0 SF |
49 | static int |
50 | symlink_hash(unsigned int link_len, const char *link_str, u8 *md5_hash) | |
51 | { | |
52 | int rc; | |
53 | unsigned int size; | |
54 | struct crypto_shash *md5; | |
55 | struct sdesc *sdescmd5; | |
56 | ||
57 | md5 = crypto_alloc_shash("md5", 0, 0); | |
ee2c9258 | 58 | if (IS_ERR(md5)) { |
ffeb414a | 59 | rc = PTR_ERR(md5); |
f96637be JP |
60 | cifs_dbg(VFS, "%s: Crypto md5 allocation error %d\n", |
61 | __func__, rc); | |
ffeb414a | 62 | return rc; |
93c100c0 SF |
63 | } |
64 | size = sizeof(struct shash_desc) + crypto_shash_descsize(md5); | |
65 | sdescmd5 = kmalloc(size, GFP_KERNEL); | |
66 | if (!sdescmd5) { | |
67 | rc = -ENOMEM; | |
93c100c0 SF |
68 | goto symlink_hash_err; |
69 | } | |
70 | sdescmd5->shash.tfm = md5; | |
71 | sdescmd5->shash.flags = 0x0; | |
72 | ||
73 | rc = crypto_shash_init(&sdescmd5->shash); | |
74 | if (rc) { | |
f96637be | 75 | cifs_dbg(VFS, "%s: Could not init md5 shash\n", __func__); |
93c100c0 SF |
76 | goto symlink_hash_err; |
77 | } | |
14cae324 SP |
78 | rc = crypto_shash_update(&sdescmd5->shash, link_str, link_len); |
79 | if (rc) { | |
f96637be | 80 | cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__); |
14cae324 SP |
81 | goto symlink_hash_err; |
82 | } | |
93c100c0 | 83 | rc = crypto_shash_final(&sdescmd5->shash, md5_hash); |
14cae324 | 84 | if (rc) |
f96637be | 85 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
93c100c0 SF |
86 | |
87 | symlink_hash_err: | |
88 | crypto_free_shash(md5); | |
89 | kfree(sdescmd5); | |
90 | ||
91 | return rc; | |
92 | } | |
93 | ||
c69c1b6e | 94 | static int |
cb084b1a SP |
95 | parse_mf_symlink(const u8 *buf, unsigned int buf_len, unsigned int *_link_len, |
96 | char **_link_str) | |
c69c1b6e SM |
97 | { |
98 | int rc; | |
99 | unsigned int link_len; | |
100 | const char *md5_str1; | |
101 | const char *link_str; | |
c69c1b6e SM |
102 | u8 md5_hash[16]; |
103 | char md5_str2[34]; | |
104 | ||
105 | if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE) | |
106 | return -EINVAL; | |
107 | ||
108 | md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET]; | |
109 | link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET]; | |
110 | ||
111 | rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len); | |
112 | if (rc != 1) | |
113 | return -EINVAL; | |
114 | ||
93c100c0 SF |
115 | rc = symlink_hash(link_len, link_str, md5_hash); |
116 | if (rc) { | |
f96637be | 117 | cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc); |
93c100c0 SF |
118 | return rc; |
119 | } | |
c69c1b6e SM |
120 | |
121 | snprintf(md5_str2, sizeof(md5_str2), | |
122 | CIFS_MF_SYMLINK_MD5_FORMAT, | |
123 | CIFS_MF_SYMLINK_MD5_ARGS(md5_hash)); | |
124 | ||
125 | if (strncmp(md5_str1, md5_str2, 17) != 0) | |
126 | return -EINVAL; | |
127 | ||
128 | if (_link_str) { | |
129 | *_link_str = kstrndup(link_str, link_len, GFP_KERNEL); | |
130 | if (!*_link_str) | |
131 | return -ENOMEM; | |
132 | } | |
133 | ||
134 | *_link_len = link_len; | |
135 | return 0; | |
136 | } | |
1da177e4 | 137 | |
0fd43ae4 | 138 | static int |
cb084b1a | 139 | format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str) |
18bddd10 | 140 | { |
93c100c0 | 141 | int rc; |
18bddd10 SM |
142 | unsigned int link_len; |
143 | unsigned int ofs; | |
18bddd10 SM |
144 | u8 md5_hash[16]; |
145 | ||
146 | if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE) | |
147 | return -EINVAL; | |
148 | ||
149 | link_len = strlen(link_str); | |
150 | ||
151 | if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN) | |
152 | return -ENAMETOOLONG; | |
153 | ||
93c100c0 SF |
154 | rc = symlink_hash(link_len, link_str, md5_hash); |
155 | if (rc) { | |
f96637be | 156 | cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc); |
93c100c0 SF |
157 | return rc; |
158 | } | |
18bddd10 SM |
159 | |
160 | snprintf(buf, buf_len, | |
161 | CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT, | |
162 | link_len, | |
163 | CIFS_MF_SYMLINK_MD5_ARGS(md5_hash)); | |
164 | ||
165 | ofs = CIFS_MF_SYMLINK_LINK_OFFSET; | |
166 | memcpy(buf + ofs, link_str, link_len); | |
167 | ||
168 | ofs += link_len; | |
169 | if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) { | |
170 | buf[ofs] = '\n'; | |
171 | ofs++; | |
172 | } | |
173 | ||
174 | while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) { | |
175 | buf[ofs] = ' '; | |
176 | ofs++; | |
177 | } | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
0f8dce1c SP |
182 | bool |
183 | couldbe_mf_symlink(const struct cifs_fattr *fattr) | |
184 | { | |
a9a315d4 | 185 | if (!S_ISREG(fattr->cf_mode)) |
0f8dce1c SP |
186 | /* it's not a symlink */ |
187 | return false; | |
188 | ||
189 | if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE) | |
190 | /* it's not a symlink */ | |
191 | return false; | |
192 | ||
193 | return true; | |
194 | } | |
195 | ||
8713d01d | 196 | static int |
cb084b1a | 197 | create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon, |
cbb0aba6 SP |
198 | struct cifs_sb_info *cifs_sb, const char *fromName, |
199 | const char *toName) | |
8713d01d SM |
200 | { |
201 | int rc; | |
8713d01d SM |
202 | u8 *buf; |
203 | unsigned int bytes_written = 0; | |
204 | ||
205 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
206 | if (!buf) | |
207 | return -ENOMEM; | |
208 | ||
cb084b1a | 209 | rc = format_mf_symlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName); |
cbb0aba6 SP |
210 | if (rc) |
211 | goto out; | |
fa2989f4 | 212 | |
da80659d SF |
213 | if (tcon->ses->server->ops->create_mf_symlink) |
214 | rc = tcon->ses->server->ops->create_mf_symlink(xid, tcon, | |
215 | cifs_sb, fromName, buf, &bytes_written); | |
216 | else | |
217 | rc = -EOPNOTSUPP; | |
218 | ||
cbb0aba6 SP |
219 | if (rc) |
220 | goto out; | |
8713d01d SM |
221 | |
222 | if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE) | |
cbb0aba6 SP |
223 | rc = -EIO; |
224 | out: | |
225 | kfree(buf); | |
226 | return rc; | |
8713d01d SM |
227 | } |
228 | ||
229 | static int | |
cb084b1a | 230 | query_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon, |
8205d1bb SP |
231 | struct cifs_sb_info *cifs_sb, const unsigned char *path, |
232 | char **symlinkinfo) | |
0fd43ae4 SM |
233 | { |
234 | int rc; | |
8205d1bb | 235 | u8 *buf = NULL; |
0fd43ae4 | 236 | unsigned int link_len = 0; |
8205d1bb | 237 | unsigned int bytes_read = 0; |
0fd43ae4 SM |
238 | |
239 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
240 | if (!buf) | |
241 | return -ENOMEM; | |
0fd43ae4 | 242 | |
8205d1bb SP |
243 | if (tcon->ses->server->ops->query_mf_symlink) |
244 | rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon, | |
245 | cifs_sb, path, buf, &bytes_read); | |
246 | else | |
247 | rc = -ENOSYS; | |
248 | ||
249 | if (rc) | |
250 | goto out; | |
251 | ||
252 | if (bytes_read == 0) { /* not a symlink */ | |
253 | rc = -EINVAL; | |
254 | goto out; | |
0fd43ae4 SM |
255 | } |
256 | ||
cb084b1a | 257 | rc = parse_mf_symlink(buf, bytes_read, &link_len, symlinkinfo); |
8205d1bb | 258 | out: |
0fd43ae4 | 259 | kfree(buf); |
8205d1bb | 260 | return rc; |
0fd43ae4 SM |
261 | } |
262 | ||
0f8dce1c SP |
263 | int |
264 | check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, | |
265 | struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr, | |
266 | const unsigned char *path) | |
8bfb50a8 | 267 | { |
0f8dce1c SP |
268 | int rc; |
269 | u8 *buf = NULL; | |
270 | unsigned int link_len = 0; | |
271 | unsigned int bytes_read = 0; | |
272 | ||
273 | if (!couldbe_mf_symlink(fattr)) | |
8bfb50a8 | 274 | /* it's not a symlink */ |
0f8dce1c | 275 | return 0; |
8bfb50a8 | 276 | |
0f8dce1c SP |
277 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); |
278 | if (!buf) | |
279 | return -ENOMEM; | |
280 | ||
281 | if (tcon->ses->server->ops->query_mf_symlink) | |
282 | rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon, | |
283 | cifs_sb, path, buf, &bytes_read); | |
284 | else | |
285 | rc = -ENOSYS; | |
286 | ||
287 | if (rc) | |
288 | goto out; | |
289 | ||
290 | if (bytes_read == 0) /* not a symlink */ | |
291 | goto out; | |
292 | ||
293 | rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL); | |
294 | if (rc == -EINVAL) { | |
8bfb50a8 | 295 | /* it's not a symlink */ |
0f8dce1c SP |
296 | rc = 0; |
297 | goto out; | |
298 | } | |
8bfb50a8 | 299 | |
0f8dce1c SP |
300 | if (rc != 0) |
301 | goto out; | |
302 | ||
303 | /* it is a symlink */ | |
304 | fattr->cf_eof = link_len; | |
305 | fattr->cf_mode &= ~S_IFMT; | |
306 | fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO; | |
307 | fattr->cf_dtype = DT_LNK; | |
308 | out: | |
309 | kfree(buf); | |
310 | return rc; | |
8bfb50a8 SM |
311 | } |
312 | ||
0f8dce1c SP |
313 | /* |
314 | * SMB 1.0 Protocol specific functions | |
315 | */ | |
316 | ||
8bfb50a8 | 317 | int |
b5be1a1c SP |
318 | cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, |
319 | struct cifs_sb_info *cifs_sb, const unsigned char *path, | |
320 | char *pbuf, unsigned int *pbytes_read) | |
8bfb50a8 SM |
321 | { |
322 | int rc; | |
323 | int oplock = 0; | |
d81b8a40 PS |
324 | struct cifs_fid fid; |
325 | struct cifs_open_parms oparms; | |
d4ffff1f | 326 | struct cifs_io_parms io_parms; |
8bfb50a8 | 327 | int buf_type = CIFS_NO_BUFFER; |
8bfb50a8 SM |
328 | FILE_ALL_INFO file_info; |
329 | ||
d81b8a40 PS |
330 | oparms.tcon = tcon; |
331 | oparms.cifs_sb = cifs_sb; | |
332 | oparms.desired_access = GENERIC_READ; | |
333 | oparms.create_options = CREATE_NOT_DIR; | |
334 | oparms.disposition = FILE_OPEN; | |
335 | oparms.path = path; | |
336 | oparms.fid = &fid; | |
337 | oparms.reconnect = false; | |
338 | ||
339 | rc = CIFS_open(xid, &oparms, &oplock, &file_info); | |
b5be1a1c | 340 | if (rc) |
1b244081 | 341 | return rc; |
8bfb50a8 | 342 | |
364d4293 SF |
343 | if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) { |
344 | rc = -ENOENT; | |
8bfb50a8 | 345 | /* it's not a symlink */ |
b5be1a1c | 346 | goto out; |
364d4293 | 347 | } |
8bfb50a8 | 348 | |
d81b8a40 | 349 | io_parms.netfid = fid.netfid; |
d4ffff1f | 350 | io_parms.pid = current->tgid; |
b5be1a1c | 351 | io_parms.tcon = tcon; |
d4ffff1f PS |
352 | io_parms.offset = 0; |
353 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
8bfb50a8 | 354 | |
1b244081 | 355 | rc = CIFSSMBRead(xid, &io_parms, pbytes_read, &pbuf, &buf_type); |
b5be1a1c | 356 | out: |
d81b8a40 | 357 | CIFSSMBClose(xid, tcon, fid.netfid); |
1b244081 SF |
358 | return rc; |
359 | } | |
360 | ||
cbb0aba6 SP |
361 | int |
362 | cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, | |
363 | struct cifs_sb_info *cifs_sb, const unsigned char *path, | |
364 | char *pbuf, unsigned int *pbytes_written) | |
365 | { | |
366 | int rc; | |
367 | int oplock = 0; | |
d81b8a40 PS |
368 | struct cifs_fid fid; |
369 | struct cifs_open_parms oparms; | |
cbb0aba6 SP |
370 | struct cifs_io_parms io_parms; |
371 | int create_options = CREATE_NOT_DIR; | |
372 | ||
373 | if (backup_cred(cifs_sb)) | |
374 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
375 | ||
d81b8a40 PS |
376 | oparms.tcon = tcon; |
377 | oparms.cifs_sb = cifs_sb; | |
378 | oparms.desired_access = GENERIC_WRITE; | |
379 | oparms.create_options = create_options; | |
a1d0b84c | 380 | oparms.disposition = FILE_CREATE; |
d81b8a40 PS |
381 | oparms.path = path; |
382 | oparms.fid = &fid; | |
383 | oparms.reconnect = false; | |
384 | ||
385 | rc = CIFS_open(xid, &oparms, &oplock, NULL); | |
cbb0aba6 SP |
386 | if (rc) |
387 | return rc; | |
388 | ||
d81b8a40 | 389 | io_parms.netfid = fid.netfid; |
cbb0aba6 SP |
390 | io_parms.pid = current->tgid; |
391 | io_parms.tcon = tcon; | |
392 | io_parms.offset = 0; | |
393 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
394 | ||
dbbab325 | 395 | rc = CIFSSMBWrite(xid, &io_parms, pbytes_written, pbuf); |
d81b8a40 | 396 | CIFSSMBClose(xid, tcon, fid.netfid); |
cbb0aba6 SP |
397 | return rc; |
398 | } | |
399 | ||
c22870ea SF |
400 | /* |
401 | * SMB 2.1/SMB3 Protocol specific functions | |
402 | */ | |
c22870ea SF |
403 | int |
404 | smb3_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, | |
405 | struct cifs_sb_info *cifs_sb, const unsigned char *path, | |
406 | char *pbuf, unsigned int *pbytes_read) | |
407 | { | |
408 | int rc; | |
409 | struct cifs_fid fid; | |
410 | struct cifs_open_parms oparms; | |
411 | struct cifs_io_parms io_parms; | |
412 | int buf_type = CIFS_NO_BUFFER; | |
413 | __le16 *utf16_path; | |
414 | __u8 oplock = SMB2_OPLOCK_LEVEL_II; | |
415 | struct smb2_file_all_info *pfile_info = NULL; | |
416 | ||
417 | oparms.tcon = tcon; | |
418 | oparms.cifs_sb = cifs_sb; | |
419 | oparms.desired_access = GENERIC_READ; | |
420 | oparms.create_options = CREATE_NOT_DIR; | |
421 | if (backup_cred(cifs_sb)) | |
422 | oparms.create_options |= CREATE_OPEN_BACKUP_INTENT; | |
423 | oparms.disposition = FILE_OPEN; | |
424 | oparms.fid = &fid; | |
425 | oparms.reconnect = false; | |
426 | ||
427 | utf16_path = cifs_convert_path_to_utf16(path, cifs_sb); | |
428 | if (utf16_path == NULL) | |
429 | return -ENOMEM; | |
430 | ||
431 | pfile_info = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2, | |
432 | GFP_KERNEL); | |
433 | ||
434 | if (pfile_info == NULL) { | |
435 | kfree(utf16_path); | |
436 | return -ENOMEM; | |
437 | } | |
438 | ||
439 | rc = SMB2_open(xid, &oparms, utf16_path, &oplock, pfile_info, NULL); | |
440 | if (rc) | |
441 | goto qmf_out_open_fail; | |
442 | ||
443 | if (pfile_info->EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) { | |
444 | /* it's not a symlink */ | |
445 | rc = -ENOENT; /* Is there a better rc to return? */ | |
446 | goto qmf_out; | |
447 | } | |
448 | ||
449 | io_parms.netfid = fid.netfid; | |
450 | io_parms.pid = current->tgid; | |
451 | io_parms.tcon = tcon; | |
452 | io_parms.offset = 0; | |
453 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
454 | io_parms.persistent_fid = fid.persistent_fid; | |
455 | io_parms.volatile_fid = fid.volatile_fid; | |
456 | rc = SMB2_read(xid, &io_parms, pbytes_read, &pbuf, &buf_type); | |
457 | qmf_out: | |
458 | SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid); | |
459 | qmf_out_open_fail: | |
460 | kfree(utf16_path); | |
461 | kfree(pfile_info); | |
462 | return rc; | |
463 | } | |
464 | ||
5ab97578 SF |
465 | int |
466 | smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, | |
467 | struct cifs_sb_info *cifs_sb, const unsigned char *path, | |
468 | char *pbuf, unsigned int *pbytes_written) | |
469 | { | |
470 | int rc; | |
471 | struct cifs_fid fid; | |
472 | struct cifs_open_parms oparms; | |
473 | struct cifs_io_parms io_parms; | |
474 | int create_options = CREATE_NOT_DIR; | |
475 | __le16 *utf16_path; | |
476 | __u8 oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE; | |
477 | struct kvec iov[2]; | |
478 | ||
479 | if (backup_cred(cifs_sb)) | |
480 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
481 | ||
482 | cifs_dbg(FYI, "%s: path: %s\n", __func__, path); | |
483 | ||
484 | utf16_path = cifs_convert_path_to_utf16(path, cifs_sb); | |
485 | if (!utf16_path) | |
486 | return -ENOMEM; | |
487 | ||
488 | oparms.tcon = tcon; | |
489 | oparms.cifs_sb = cifs_sb; | |
490 | oparms.desired_access = GENERIC_WRITE; | |
491 | oparms.create_options = create_options; | |
492 | oparms.disposition = FILE_CREATE; | |
493 | oparms.fid = &fid; | |
494 | oparms.reconnect = false; | |
495 | ||
496 | rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL); | |
497 | if (rc) { | |
498 | kfree(utf16_path); | |
499 | return rc; | |
500 | } | |
501 | ||
502 | io_parms.netfid = fid.netfid; | |
503 | io_parms.pid = current->tgid; | |
504 | io_parms.tcon = tcon; | |
505 | io_parms.offset = 0; | |
506 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
507 | io_parms.persistent_fid = fid.persistent_fid; | |
508 | io_parms.volatile_fid = fid.volatile_fid; | |
509 | ||
510 | /* iov[0] is reserved for smb header */ | |
511 | iov[1].iov_base = pbuf; | |
512 | iov[1].iov_len = CIFS_MF_SYMLINK_FILE_SIZE; | |
513 | ||
514 | rc = SMB2_write(xid, &io_parms, pbytes_written, iov, 1); | |
515 | ||
516 | /* Make sure we wrote all of the symlink data */ | |
517 | if ((rc == 0) && (*pbytes_written != CIFS_MF_SYMLINK_FILE_SIZE)) | |
518 | rc = -EIO; | |
519 | ||
520 | SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid); | |
521 | ||
522 | kfree(utf16_path); | |
523 | return rc; | |
524 | } | |
5ab97578 | 525 | |
0f8dce1c SP |
526 | /* |
527 | * M-F Symlink Functions - End | |
528 | */ | |
8bfb50a8 | 529 | |
1da177e4 LT |
530 | int |
531 | cifs_hardlink(struct dentry *old_file, struct inode *inode, | |
532 | struct dentry *direntry) | |
533 | { | |
534 | int rc = -EACCES; | |
6d5786a3 | 535 | unsigned int xid; |
d6e906f1 SF |
536 | char *from_name = NULL; |
537 | char *to_name = NULL; | |
7ffec372 JL |
538 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
539 | struct tcon_link *tlink; | |
d6e906f1 SF |
540 | struct cifs_tcon *tcon; |
541 | struct TCP_Server_Info *server; | |
1da177e4 LT |
542 | struct cifsInodeInfo *cifsInode; |
543 | ||
7ffec372 JL |
544 | tlink = cifs_sb_tlink(cifs_sb); |
545 | if (IS_ERR(tlink)) | |
546 | return PTR_ERR(tlink); | |
d6e906f1 | 547 | tcon = tlink_tcon(tlink); |
1da177e4 | 548 | |
6d5786a3 | 549 | xid = get_xid(); |
1da177e4 | 550 | |
d6e906f1 SF |
551 | from_name = build_path_from_dentry(old_file); |
552 | to_name = build_path_from_dentry(direntry); | |
553 | if ((from_name == NULL) || (to_name == NULL)) { | |
1da177e4 LT |
554 | rc = -ENOMEM; |
555 | goto cifs_hl_exit; | |
556 | } | |
557 | ||
d6e906f1 SF |
558 | if (tcon->unix_ext) |
559 | rc = CIFSUnixCreateHardLink(xid, tcon, from_name, to_name, | |
7ffec372 | 560 | cifs_sb->local_nls, |
2baa2682 | 561 | cifs_remap(cifs_sb)); |
1da177e4 | 562 | else { |
d6e906f1 | 563 | server = tcon->ses->server; |
abf9767c CE |
564 | if (!server->ops->create_hardlink) { |
565 | rc = -ENOSYS; | |
566 | goto cifs_hl_exit; | |
567 | } | |
d6e906f1 SF |
568 | rc = server->ops->create_hardlink(xid, tcon, from_name, to_name, |
569 | cifs_sb); | |
fb8c4b14 SF |
570 | if ((rc == -EIO) || (rc == -EINVAL)) |
571 | rc = -EOPNOTSUPP; | |
1da177e4 LT |
572 | } |
573 | ||
31ec35d6 SF |
574 | d_drop(direntry); /* force new lookup from server of target */ |
575 | ||
d6e906f1 SF |
576 | /* |
577 | * if source file is cached (oplocked) revalidate will not go to server | |
578 | * until the file is closed or oplock broken so update nlinks locally | |
579 | */ | |
2b0143b5 DH |
580 | if (d_really_is_positive(old_file)) { |
581 | cifsInode = CIFS_I(d_inode(old_file)); | |
fb8c4b14 | 582 | if (rc == 0) { |
2b0143b5 DH |
583 | spin_lock(&d_inode(old_file)->i_lock); |
584 | inc_nlink(d_inode(old_file)); | |
585 | spin_unlock(&d_inode(old_file)->i_lock); | |
ff273cb8 | 586 | |
d6e906f1 SF |
587 | /* |
588 | * parent dir timestamps will update from srv within a | |
589 | * second, would it really be worth it to set the parent | |
590 | * dir cifs inode time to zero to force revalidate | |
591 | * (faster) for it too? | |
592 | */ | |
31ec35d6 | 593 | } |
d6e906f1 SF |
594 | /* |
595 | * if not oplocked will force revalidate to get info on source | |
ff273cb8 SF |
596 | * file from srv. Note Samba server prior to 4.2 has bug - |
597 | * not updating src file ctime on hardlinks but Windows servers | |
598 | * handle it properly | |
d6e906f1 | 599 | */ |
31ec35d6 SF |
600 | cifsInode->time = 0; |
601 | ||
d6e906f1 SF |
602 | /* |
603 | * Will update parent dir timestamps from srv within a second. | |
604 | * Would it really be worth it to set the parent dir (cifs | |
605 | * inode) time field to zero to force revalidate on parent | |
606 | * directory faster ie | |
607 | * | |
608 | * CIFS_I(inode)->time = 0; | |
609 | */ | |
1da177e4 | 610 | } |
1da177e4 LT |
611 | |
612 | cifs_hl_exit: | |
d6e906f1 SF |
613 | kfree(from_name); |
614 | kfree(to_name); | |
6d5786a3 | 615 | free_xid(xid); |
7ffec372 | 616 | cifs_put_tlink(tlink); |
1da177e4 LT |
617 | return rc; |
618 | } | |
619 | ||
680baacb | 620 | const char * |
fceef393 AV |
621 | cifs_get_link(struct dentry *direntry, struct inode *inode, |
622 | struct delayed_call *done) | |
1da177e4 | 623 | { |
8b6427a2 | 624 | int rc = -ENOMEM; |
6d5786a3 | 625 | unsigned int xid; |
1da177e4 | 626 | char *full_path = NULL; |
8b6427a2 JL |
627 | char *target_path = NULL; |
628 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 | 629 | struct tcon_link *tlink = NULL; |
96daf2b0 | 630 | struct cifs_tcon *tcon; |
b42bf888 | 631 | struct TCP_Server_Info *server; |
1da177e4 | 632 | |
6b255391 AV |
633 | if (!direntry) |
634 | return ERR_PTR(-ECHILD); | |
635 | ||
6d5786a3 | 636 | xid = get_xid(); |
1da177e4 | 637 | |
7ffec372 JL |
638 | tlink = cifs_sb_tlink(cifs_sb); |
639 | if (IS_ERR(tlink)) { | |
680baacb AV |
640 | free_xid(xid); |
641 | return ERR_CAST(tlink); | |
7ffec372 JL |
642 | } |
643 | tcon = tlink_tcon(tlink); | |
b42bf888 | 644 | server = tcon->ses->server; |
1da177e4 | 645 | |
8b6427a2 | 646 | full_path = build_path_from_dentry(direntry); |
680baacb AV |
647 | if (!full_path) { |
648 | free_xid(xid); | |
649 | cifs_put_tlink(tlink); | |
650 | return ERR_PTR(-ENOMEM); | |
651 | } | |
1da177e4 | 652 | |
f96637be | 653 | cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", full_path, inode); |
1da177e4 | 654 | |
1b12b9c1 SM |
655 | rc = -EACCES; |
656 | /* | |
657 | * First try Minshall+French Symlinks, if configured | |
658 | * and fallback to UNIX Extensions Symlinks. | |
659 | */ | |
660 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) | |
8205d1bb SP |
661 | rc = query_mf_symlink(xid, tcon, cifs_sb, full_path, |
662 | &target_path); | |
1b12b9c1 | 663 | |
0ecdb4f5 | 664 | if (rc != 0 && server->ops->query_symlink) |
b42bf888 PS |
665 | rc = server->ops->query_symlink(xid, tcon, full_path, |
666 | &target_path, cifs_sb); | |
1b12b9c1 | 667 | |
8b6427a2 | 668 | kfree(full_path); |
680baacb AV |
669 | free_xid(xid); |
670 | cifs_put_tlink(tlink); | |
460b9696 | 671 | if (rc != 0) { |
1da177e4 | 672 | kfree(target_path); |
680baacb | 673 | return ERR_PTR(rc); |
1da177e4 | 674 | } |
fceef393 AV |
675 | set_delayed_call(done, kfree_link, target_path); |
676 | return target_path; | |
1da177e4 LT |
677 | } |
678 | ||
679 | int | |
680 | cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname) | |
681 | { | |
682 | int rc = -EOPNOTSUPP; | |
6d5786a3 | 683 | unsigned int xid; |
7ffec372 JL |
684 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
685 | struct tcon_link *tlink; | |
96daf2b0 | 686 | struct cifs_tcon *pTcon; |
1da177e4 LT |
687 | char *full_path = NULL; |
688 | struct inode *newinode = NULL; | |
689 | ||
6d5786a3 | 690 | xid = get_xid(); |
1da177e4 | 691 | |
7ffec372 JL |
692 | tlink = cifs_sb_tlink(cifs_sb); |
693 | if (IS_ERR(tlink)) { | |
694 | rc = PTR_ERR(tlink); | |
695 | goto symlink_exit; | |
696 | } | |
697 | pTcon = tlink_tcon(tlink); | |
1da177e4 | 698 | |
7f57356b | 699 | full_path = build_path_from_dentry(direntry); |
fb8c4b14 | 700 | if (full_path == NULL) { |
0f3bc09e | 701 | rc = -ENOMEM; |
7ffec372 | 702 | goto symlink_exit; |
1da177e4 LT |
703 | } |
704 | ||
f96637be JP |
705 | cifs_dbg(FYI, "Full path: %s\n", full_path); |
706 | cifs_dbg(FYI, "symname is %s\n", symname); | |
1da177e4 LT |
707 | |
708 | /* BB what if DFS and this volume is on different share? BB */ | |
1b12b9c1 | 709 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) |
cbb0aba6 | 710 | rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname); |
1b12b9c1 | 711 | else if (pTcon->unix_ext) |
1da177e4 | 712 | rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname, |
bc8ebdc4 NA |
713 | cifs_sb->local_nls, |
714 | cifs_remap(cifs_sb)); | |
1da177e4 | 715 | /* else |
fb8c4b14 SF |
716 | rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName, |
717 | cifs_sb_target->local_nls); */ | |
1da177e4 LT |
718 | |
719 | if (rc == 0) { | |
c18c842b | 720 | if (pTcon->unix_ext) |
1da177e4 | 721 | rc = cifs_get_inode_info_unix(&newinode, full_path, |
fb8c4b14 | 722 | inode->i_sb, xid); |
1da177e4 LT |
723 | else |
724 | rc = cifs_get_inode_info(&newinode, full_path, NULL, | |
8b1327f6 | 725 | inode->i_sb, xid, NULL); |
1da177e4 LT |
726 | |
727 | if (rc != 0) { | |
f96637be JP |
728 | cifs_dbg(FYI, "Create symlink ok, getinodeinfo fail rc = %d\n", |
729 | rc); | |
1da177e4 | 730 | } else { |
1da177e4 LT |
731 | d_instantiate(direntry, newinode); |
732 | } | |
733 | } | |
7ffec372 | 734 | symlink_exit: |
f99d49ad | 735 | kfree(full_path); |
7ffec372 | 736 | cifs_put_tlink(tlink); |
6d5786a3 | 737 | free_xid(xid); |
1da177e4 LT |
738 | return rc; |
739 | } |