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" | |
c69c1b6e | 31 | |
0f8dce1c SP |
32 | /* |
33 | * M-F Symlink Functions - Begin | |
34 | */ | |
35 | ||
c69c1b6e SM |
36 | #define CIFS_MF_SYMLINK_LEN_OFFSET (4+1) |
37 | #define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1)) | |
38 | #define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1)) | |
39 | #define CIFS_MF_SYMLINK_LINK_MAXLEN (1024) | |
40 | #define CIFS_MF_SYMLINK_FILE_SIZE \ | |
41 | (CIFS_MF_SYMLINK_LINK_OFFSET + CIFS_MF_SYMLINK_LINK_MAXLEN) | |
42 | ||
43 | #define CIFS_MF_SYMLINK_LEN_FORMAT "XSym\n%04u\n" | |
44 | #define CIFS_MF_SYMLINK_MD5_FORMAT \ | |
45 | "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n" | |
46 | #define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) \ | |
47 | md5_hash[0], md5_hash[1], md5_hash[2], md5_hash[3], \ | |
48 | md5_hash[4], md5_hash[5], md5_hash[6], md5_hash[7], \ | |
49 | md5_hash[8], md5_hash[9], md5_hash[10], md5_hash[11],\ | |
50 | md5_hash[12], md5_hash[13], md5_hash[14], md5_hash[15] | |
51 | ||
93c100c0 SF |
52 | static int |
53 | symlink_hash(unsigned int link_len, const char *link_str, u8 *md5_hash) | |
54 | { | |
55 | int rc; | |
56 | unsigned int size; | |
57 | struct crypto_shash *md5; | |
58 | struct sdesc *sdescmd5; | |
59 | ||
60 | md5 = crypto_alloc_shash("md5", 0, 0); | |
ee2c9258 | 61 | if (IS_ERR(md5)) { |
ffeb414a | 62 | rc = PTR_ERR(md5); |
f96637be JP |
63 | cifs_dbg(VFS, "%s: Crypto md5 allocation error %d\n", |
64 | __func__, rc); | |
ffeb414a | 65 | return rc; |
93c100c0 SF |
66 | } |
67 | size = sizeof(struct shash_desc) + crypto_shash_descsize(md5); | |
68 | sdescmd5 = kmalloc(size, GFP_KERNEL); | |
69 | if (!sdescmd5) { | |
70 | rc = -ENOMEM; | |
93c100c0 SF |
71 | goto symlink_hash_err; |
72 | } | |
73 | sdescmd5->shash.tfm = md5; | |
74 | sdescmd5->shash.flags = 0x0; | |
75 | ||
76 | rc = crypto_shash_init(&sdescmd5->shash); | |
77 | if (rc) { | |
f96637be | 78 | cifs_dbg(VFS, "%s: Could not init md5 shash\n", __func__); |
93c100c0 SF |
79 | goto symlink_hash_err; |
80 | } | |
14cae324 SP |
81 | rc = crypto_shash_update(&sdescmd5->shash, link_str, link_len); |
82 | if (rc) { | |
f96637be | 83 | cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__); |
14cae324 SP |
84 | goto symlink_hash_err; |
85 | } | |
93c100c0 | 86 | rc = crypto_shash_final(&sdescmd5->shash, md5_hash); |
14cae324 | 87 | if (rc) |
f96637be | 88 | cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__); |
93c100c0 SF |
89 | |
90 | symlink_hash_err: | |
91 | crypto_free_shash(md5); | |
92 | kfree(sdescmd5); | |
93 | ||
94 | return rc; | |
95 | } | |
96 | ||
c69c1b6e | 97 | static int |
cb084b1a SP |
98 | parse_mf_symlink(const u8 *buf, unsigned int buf_len, unsigned int *_link_len, |
99 | char **_link_str) | |
c69c1b6e SM |
100 | { |
101 | int rc; | |
102 | unsigned int link_len; | |
103 | const char *md5_str1; | |
104 | const char *link_str; | |
c69c1b6e SM |
105 | u8 md5_hash[16]; |
106 | char md5_str2[34]; | |
107 | ||
108 | if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE) | |
109 | return -EINVAL; | |
110 | ||
111 | md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET]; | |
112 | link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET]; | |
113 | ||
114 | rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len); | |
115 | if (rc != 1) | |
116 | return -EINVAL; | |
117 | ||
93c100c0 SF |
118 | rc = symlink_hash(link_len, link_str, md5_hash); |
119 | if (rc) { | |
f96637be | 120 | cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc); |
93c100c0 SF |
121 | return rc; |
122 | } | |
c69c1b6e SM |
123 | |
124 | snprintf(md5_str2, sizeof(md5_str2), | |
125 | CIFS_MF_SYMLINK_MD5_FORMAT, | |
126 | CIFS_MF_SYMLINK_MD5_ARGS(md5_hash)); | |
127 | ||
128 | if (strncmp(md5_str1, md5_str2, 17) != 0) | |
129 | return -EINVAL; | |
130 | ||
131 | if (_link_str) { | |
132 | *_link_str = kstrndup(link_str, link_len, GFP_KERNEL); | |
133 | if (!*_link_str) | |
134 | return -ENOMEM; | |
135 | } | |
136 | ||
137 | *_link_len = link_len; | |
138 | return 0; | |
139 | } | |
1da177e4 | 140 | |
0fd43ae4 | 141 | static int |
cb084b1a | 142 | format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str) |
18bddd10 | 143 | { |
93c100c0 | 144 | int rc; |
18bddd10 SM |
145 | unsigned int link_len; |
146 | unsigned int ofs; | |
18bddd10 SM |
147 | u8 md5_hash[16]; |
148 | ||
149 | if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE) | |
150 | return -EINVAL; | |
151 | ||
152 | link_len = strlen(link_str); | |
153 | ||
154 | if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN) | |
155 | return -ENAMETOOLONG; | |
156 | ||
93c100c0 SF |
157 | rc = symlink_hash(link_len, link_str, md5_hash); |
158 | if (rc) { | |
f96637be | 159 | cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc); |
93c100c0 SF |
160 | return rc; |
161 | } | |
18bddd10 SM |
162 | |
163 | snprintf(buf, buf_len, | |
164 | CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT, | |
165 | link_len, | |
166 | CIFS_MF_SYMLINK_MD5_ARGS(md5_hash)); | |
167 | ||
168 | ofs = CIFS_MF_SYMLINK_LINK_OFFSET; | |
169 | memcpy(buf + ofs, link_str, link_len); | |
170 | ||
171 | ofs += link_len; | |
172 | if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) { | |
173 | buf[ofs] = '\n'; | |
174 | ofs++; | |
175 | } | |
176 | ||
177 | while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) { | |
178 | buf[ofs] = ' '; | |
179 | ofs++; | |
180 | } | |
181 | ||
182 | return 0; | |
183 | } | |
184 | ||
0f8dce1c SP |
185 | bool |
186 | couldbe_mf_symlink(const struct cifs_fattr *fattr) | |
187 | { | |
a9a315d4 | 188 | if (!S_ISREG(fattr->cf_mode)) |
0f8dce1c SP |
189 | /* it's not a symlink */ |
190 | return false; | |
191 | ||
192 | if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE) | |
193 | /* it's not a symlink */ | |
194 | return false; | |
195 | ||
196 | return true; | |
197 | } | |
198 | ||
8713d01d | 199 | static int |
cb084b1a | 200 | create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon, |
cbb0aba6 SP |
201 | struct cifs_sb_info *cifs_sb, const char *fromName, |
202 | const char *toName) | |
8713d01d SM |
203 | { |
204 | int rc; | |
8713d01d SM |
205 | u8 *buf; |
206 | unsigned int bytes_written = 0; | |
207 | ||
208 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
209 | if (!buf) | |
210 | return -ENOMEM; | |
211 | ||
cb084b1a | 212 | rc = format_mf_symlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName); |
cbb0aba6 SP |
213 | if (rc) |
214 | goto out; | |
fa2989f4 | 215 | |
cbb0aba6 SP |
216 | rc = tcon->ses->server->ops->create_mf_symlink(xid, tcon, cifs_sb, |
217 | fromName, buf, &bytes_written); | |
218 | if (rc) | |
219 | goto out; | |
8713d01d SM |
220 | |
221 | if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE) | |
cbb0aba6 SP |
222 | rc = -EIO; |
223 | out: | |
224 | kfree(buf); | |
225 | return rc; | |
8713d01d SM |
226 | } |
227 | ||
228 | static int | |
cb084b1a | 229 | query_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon, |
8205d1bb SP |
230 | struct cifs_sb_info *cifs_sb, const unsigned char *path, |
231 | char **symlinkinfo) | |
0fd43ae4 SM |
232 | { |
233 | int rc; | |
8205d1bb | 234 | u8 *buf = NULL; |
0fd43ae4 | 235 | unsigned int link_len = 0; |
8205d1bb | 236 | unsigned int bytes_read = 0; |
0fd43ae4 SM |
237 | |
238 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); | |
239 | if (!buf) | |
240 | return -ENOMEM; | |
0fd43ae4 | 241 | |
8205d1bb SP |
242 | if (tcon->ses->server->ops->query_mf_symlink) |
243 | rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon, | |
244 | cifs_sb, path, buf, &bytes_read); | |
245 | else | |
246 | rc = -ENOSYS; | |
247 | ||
248 | if (rc) | |
249 | goto out; | |
250 | ||
251 | if (bytes_read == 0) { /* not a symlink */ | |
252 | rc = -EINVAL; | |
253 | goto out; | |
0fd43ae4 SM |
254 | } |
255 | ||
cb084b1a | 256 | rc = parse_mf_symlink(buf, bytes_read, &link_len, symlinkinfo); |
8205d1bb | 257 | out: |
0fd43ae4 | 258 | kfree(buf); |
8205d1bb | 259 | return rc; |
0fd43ae4 SM |
260 | } |
261 | ||
0f8dce1c SP |
262 | int |
263 | check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, | |
264 | struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr, | |
265 | const unsigned char *path) | |
8bfb50a8 | 266 | { |
0f8dce1c SP |
267 | int rc; |
268 | u8 *buf = NULL; | |
269 | unsigned int link_len = 0; | |
270 | unsigned int bytes_read = 0; | |
271 | ||
272 | if (!couldbe_mf_symlink(fattr)) | |
8bfb50a8 | 273 | /* it's not a symlink */ |
0f8dce1c | 274 | return 0; |
8bfb50a8 | 275 | |
0f8dce1c SP |
276 | buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL); |
277 | if (!buf) | |
278 | return -ENOMEM; | |
279 | ||
280 | if (tcon->ses->server->ops->query_mf_symlink) | |
281 | rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon, | |
282 | cifs_sb, path, buf, &bytes_read); | |
283 | else | |
284 | rc = -ENOSYS; | |
285 | ||
286 | if (rc) | |
287 | goto out; | |
288 | ||
289 | if (bytes_read == 0) /* not a symlink */ | |
290 | goto out; | |
291 | ||
292 | rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL); | |
293 | if (rc == -EINVAL) { | |
8bfb50a8 | 294 | /* it's not a symlink */ |
0f8dce1c SP |
295 | rc = 0; |
296 | goto out; | |
297 | } | |
8bfb50a8 | 298 | |
0f8dce1c SP |
299 | if (rc != 0) |
300 | goto out; | |
301 | ||
302 | /* it is a symlink */ | |
303 | fattr->cf_eof = link_len; | |
304 | fattr->cf_mode &= ~S_IFMT; | |
305 | fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO; | |
306 | fattr->cf_dtype = DT_LNK; | |
307 | out: | |
308 | kfree(buf); | |
309 | return rc; | |
8bfb50a8 SM |
310 | } |
311 | ||
0f8dce1c SP |
312 | /* |
313 | * SMB 1.0 Protocol specific functions | |
314 | */ | |
315 | ||
8bfb50a8 | 316 | int |
b5be1a1c SP |
317 | cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, |
318 | struct cifs_sb_info *cifs_sb, const unsigned char *path, | |
319 | char *pbuf, unsigned int *pbytes_read) | |
8bfb50a8 SM |
320 | { |
321 | int rc; | |
322 | int oplock = 0; | |
d81b8a40 PS |
323 | struct cifs_fid fid; |
324 | struct cifs_open_parms oparms; | |
d4ffff1f | 325 | struct cifs_io_parms io_parms; |
8bfb50a8 | 326 | int buf_type = CIFS_NO_BUFFER; |
8bfb50a8 SM |
327 | FILE_ALL_INFO file_info; |
328 | ||
d81b8a40 PS |
329 | oparms.tcon = tcon; |
330 | oparms.cifs_sb = cifs_sb; | |
331 | oparms.desired_access = GENERIC_READ; | |
332 | oparms.create_options = CREATE_NOT_DIR; | |
333 | oparms.disposition = FILE_OPEN; | |
334 | oparms.path = path; | |
335 | oparms.fid = &fid; | |
336 | oparms.reconnect = false; | |
337 | ||
338 | rc = CIFS_open(xid, &oparms, &oplock, &file_info); | |
b5be1a1c | 339 | if (rc) |
1b244081 | 340 | return rc; |
8bfb50a8 | 341 | |
b5be1a1c | 342 | if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) |
8bfb50a8 | 343 | /* it's not a symlink */ |
b5be1a1c | 344 | goto out; |
8bfb50a8 | 345 | |
d81b8a40 | 346 | io_parms.netfid = fid.netfid; |
d4ffff1f | 347 | io_parms.pid = current->tgid; |
b5be1a1c | 348 | io_parms.tcon = tcon; |
d4ffff1f PS |
349 | io_parms.offset = 0; |
350 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
8bfb50a8 | 351 | |
1b244081 | 352 | rc = CIFSSMBRead(xid, &io_parms, pbytes_read, &pbuf, &buf_type); |
b5be1a1c | 353 | out: |
d81b8a40 | 354 | CIFSSMBClose(xid, tcon, fid.netfid); |
1b244081 SF |
355 | return rc; |
356 | } | |
357 | ||
cbb0aba6 SP |
358 | int |
359 | cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon, | |
360 | struct cifs_sb_info *cifs_sb, const unsigned char *path, | |
361 | char *pbuf, unsigned int *pbytes_written) | |
362 | { | |
363 | int rc; | |
364 | int oplock = 0; | |
d81b8a40 PS |
365 | struct cifs_fid fid; |
366 | struct cifs_open_parms oparms; | |
cbb0aba6 SP |
367 | struct cifs_io_parms io_parms; |
368 | int create_options = CREATE_NOT_DIR; | |
369 | ||
370 | if (backup_cred(cifs_sb)) | |
371 | create_options |= CREATE_OPEN_BACKUP_INTENT; | |
372 | ||
d81b8a40 PS |
373 | oparms.tcon = tcon; |
374 | oparms.cifs_sb = cifs_sb; | |
375 | oparms.desired_access = GENERIC_WRITE; | |
376 | oparms.create_options = create_options; | |
a1d0b84c | 377 | oparms.disposition = FILE_CREATE; |
d81b8a40 PS |
378 | oparms.path = path; |
379 | oparms.fid = &fid; | |
380 | oparms.reconnect = false; | |
381 | ||
382 | rc = CIFS_open(xid, &oparms, &oplock, NULL); | |
cbb0aba6 SP |
383 | if (rc) |
384 | return rc; | |
385 | ||
d81b8a40 | 386 | io_parms.netfid = fid.netfid; |
cbb0aba6 SP |
387 | io_parms.pid = current->tgid; |
388 | io_parms.tcon = tcon; | |
389 | io_parms.offset = 0; | |
390 | io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE; | |
391 | ||
392 | rc = CIFSSMBWrite(xid, &io_parms, pbytes_written, pbuf, NULL, 0); | |
d81b8a40 | 393 | CIFSSMBClose(xid, tcon, fid.netfid); |
cbb0aba6 SP |
394 | return rc; |
395 | } | |
396 | ||
0f8dce1c SP |
397 | /* |
398 | * M-F Symlink Functions - End | |
399 | */ | |
8bfb50a8 | 400 | |
1da177e4 LT |
401 | int |
402 | cifs_hardlink(struct dentry *old_file, struct inode *inode, | |
403 | struct dentry *direntry) | |
404 | { | |
405 | int rc = -EACCES; | |
6d5786a3 | 406 | unsigned int xid; |
d6e906f1 SF |
407 | char *from_name = NULL; |
408 | char *to_name = NULL; | |
7ffec372 JL |
409 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
410 | struct tcon_link *tlink; | |
d6e906f1 SF |
411 | struct cifs_tcon *tcon; |
412 | struct TCP_Server_Info *server; | |
1da177e4 LT |
413 | struct cifsInodeInfo *cifsInode; |
414 | ||
7ffec372 JL |
415 | tlink = cifs_sb_tlink(cifs_sb); |
416 | if (IS_ERR(tlink)) | |
417 | return PTR_ERR(tlink); | |
d6e906f1 | 418 | tcon = tlink_tcon(tlink); |
1da177e4 | 419 | |
6d5786a3 | 420 | xid = get_xid(); |
1da177e4 | 421 | |
d6e906f1 SF |
422 | from_name = build_path_from_dentry(old_file); |
423 | to_name = build_path_from_dentry(direntry); | |
424 | if ((from_name == NULL) || (to_name == NULL)) { | |
1da177e4 LT |
425 | rc = -ENOMEM; |
426 | goto cifs_hl_exit; | |
427 | } | |
428 | ||
d6e906f1 SF |
429 | if (tcon->unix_ext) |
430 | rc = CIFSUnixCreateHardLink(xid, tcon, from_name, to_name, | |
7ffec372 JL |
431 | cifs_sb->local_nls, |
432 | cifs_sb->mnt_cifs_flags & | |
737b758c | 433 | CIFS_MOUNT_MAP_SPECIAL_CHR); |
1da177e4 | 434 | else { |
d6e906f1 | 435 | server = tcon->ses->server; |
abf9767c CE |
436 | if (!server->ops->create_hardlink) { |
437 | rc = -ENOSYS; | |
438 | goto cifs_hl_exit; | |
439 | } | |
d6e906f1 SF |
440 | rc = server->ops->create_hardlink(xid, tcon, from_name, to_name, |
441 | cifs_sb); | |
fb8c4b14 SF |
442 | if ((rc == -EIO) || (rc == -EINVAL)) |
443 | rc = -EOPNOTSUPP; | |
1da177e4 LT |
444 | } |
445 | ||
31ec35d6 SF |
446 | d_drop(direntry); /* force new lookup from server of target */ |
447 | ||
d6e906f1 SF |
448 | /* |
449 | * if source file is cached (oplocked) revalidate will not go to server | |
450 | * until the file is closed or oplock broken so update nlinks locally | |
451 | */ | |
fb8c4b14 | 452 | if (old_file->d_inode) { |
31ec35d6 | 453 | cifsInode = CIFS_I(old_file->d_inode); |
fb8c4b14 | 454 | if (rc == 0) { |
b7ca6928 | 455 | spin_lock(&old_file->d_inode->i_lock); |
6d6b77f1 | 456 | inc_nlink(old_file->d_inode); |
b7ca6928 | 457 | spin_unlock(&old_file->d_inode->i_lock); |
d6e906f1 SF |
458 | /* |
459 | * BB should we make this contingent on superblock flag | |
460 | * NOATIME? | |
461 | */ | |
462 | /* old_file->d_inode->i_ctime = CURRENT_TIME; */ | |
463 | /* | |
464 | * parent dir timestamps will update from srv within a | |
465 | * second, would it really be worth it to set the parent | |
466 | * dir cifs inode time to zero to force revalidate | |
467 | * (faster) for it too? | |
468 | */ | |
31ec35d6 | 469 | } |
d6e906f1 SF |
470 | /* |
471 | * if not oplocked will force revalidate to get info on source | |
472 | * file from srv | |
473 | */ | |
31ec35d6 SF |
474 | cifsInode->time = 0; |
475 | ||
d6e906f1 SF |
476 | /* |
477 | * Will update parent dir timestamps from srv within a second. | |
478 | * Would it really be worth it to set the parent dir (cifs | |
479 | * inode) time field to zero to force revalidate on parent | |
480 | * directory faster ie | |
481 | * | |
482 | * CIFS_I(inode)->time = 0; | |
483 | */ | |
1da177e4 | 484 | } |
1da177e4 LT |
485 | |
486 | cifs_hl_exit: | |
d6e906f1 SF |
487 | kfree(from_name); |
488 | kfree(to_name); | |
6d5786a3 | 489 | free_xid(xid); |
7ffec372 | 490 | cifs_put_tlink(tlink); |
1da177e4 LT |
491 | return rc; |
492 | } | |
493 | ||
cc314eef | 494 | void * |
1da177e4 LT |
495 | cifs_follow_link(struct dentry *direntry, struct nameidata *nd) |
496 | { | |
497 | struct inode *inode = direntry->d_inode; | |
8b6427a2 | 498 | int rc = -ENOMEM; |
6d5786a3 | 499 | unsigned int xid; |
1da177e4 | 500 | char *full_path = NULL; |
8b6427a2 JL |
501 | char *target_path = NULL; |
502 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
7ffec372 | 503 | struct tcon_link *tlink = NULL; |
96daf2b0 | 504 | struct cifs_tcon *tcon; |
b42bf888 | 505 | struct TCP_Server_Info *server; |
1da177e4 | 506 | |
6d5786a3 | 507 | xid = get_xid(); |
1da177e4 | 508 | |
7ffec372 JL |
509 | tlink = cifs_sb_tlink(cifs_sb); |
510 | if (IS_ERR(tlink)) { | |
511 | rc = PTR_ERR(tlink); | |
512 | tlink = NULL; | |
513 | goto out; | |
514 | } | |
515 | tcon = tlink_tcon(tlink); | |
b42bf888 | 516 | server = tcon->ses->server; |
1da177e4 | 517 | |
8b6427a2 | 518 | full_path = build_path_from_dentry(direntry); |
1da177e4 | 519 | if (!full_path) |
460b9696 | 520 | goto out; |
1da177e4 | 521 | |
f96637be | 522 | cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", full_path, inode); |
1da177e4 | 523 | |
1b12b9c1 SM |
524 | rc = -EACCES; |
525 | /* | |
526 | * First try Minshall+French Symlinks, if configured | |
527 | * and fallback to UNIX Extensions Symlinks. | |
528 | */ | |
529 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) | |
8205d1bb SP |
530 | rc = query_mf_symlink(xid, tcon, cifs_sb, full_path, |
531 | &target_path); | |
1b12b9c1 | 532 | |
0ecdb4f5 | 533 | if (rc != 0 && server->ops->query_symlink) |
b42bf888 PS |
534 | rc = server->ops->query_symlink(xid, tcon, full_path, |
535 | &target_path, cifs_sb); | |
1b12b9c1 | 536 | |
8b6427a2 JL |
537 | kfree(full_path); |
538 | out: | |
460b9696 | 539 | if (rc != 0) { |
1da177e4 LT |
540 | kfree(target_path); |
541 | target_path = ERR_PTR(rc); | |
542 | } | |
543 | ||
6d5786a3 | 544 | free_xid(xid); |
7ffec372 JL |
545 | if (tlink) |
546 | cifs_put_tlink(tlink); | |
1da177e4 | 547 | nd_set_link(nd, target_path); |
460b9696 | 548 | return NULL; |
1da177e4 LT |
549 | } |
550 | ||
551 | int | |
552 | cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname) | |
553 | { | |
554 | int rc = -EOPNOTSUPP; | |
6d5786a3 | 555 | unsigned int xid; |
7ffec372 JL |
556 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
557 | struct tcon_link *tlink; | |
96daf2b0 | 558 | struct cifs_tcon *pTcon; |
1da177e4 LT |
559 | char *full_path = NULL; |
560 | struct inode *newinode = NULL; | |
561 | ||
6d5786a3 | 562 | xid = get_xid(); |
1da177e4 | 563 | |
7ffec372 JL |
564 | tlink = cifs_sb_tlink(cifs_sb); |
565 | if (IS_ERR(tlink)) { | |
566 | rc = PTR_ERR(tlink); | |
567 | goto symlink_exit; | |
568 | } | |
569 | pTcon = tlink_tcon(tlink); | |
1da177e4 | 570 | |
7f57356b | 571 | full_path = build_path_from_dentry(direntry); |
fb8c4b14 | 572 | if (full_path == NULL) { |
0f3bc09e | 573 | rc = -ENOMEM; |
7ffec372 | 574 | goto symlink_exit; |
1da177e4 LT |
575 | } |
576 | ||
f96637be JP |
577 | cifs_dbg(FYI, "Full path: %s\n", full_path); |
578 | cifs_dbg(FYI, "symname is %s\n", symname); | |
1da177e4 LT |
579 | |
580 | /* BB what if DFS and this volume is on different share? BB */ | |
1b12b9c1 | 581 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) |
cbb0aba6 | 582 | rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname); |
1b12b9c1 | 583 | else if (pTcon->unix_ext) |
1da177e4 LT |
584 | rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname, |
585 | cifs_sb->local_nls); | |
586 | /* else | |
fb8c4b14 SF |
587 | rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName, |
588 | cifs_sb_target->local_nls); */ | |
1da177e4 LT |
589 | |
590 | if (rc == 0) { | |
c18c842b | 591 | if (pTcon->unix_ext) |
1da177e4 | 592 | rc = cifs_get_inode_info_unix(&newinode, full_path, |
fb8c4b14 | 593 | inode->i_sb, xid); |
1da177e4 LT |
594 | else |
595 | rc = cifs_get_inode_info(&newinode, full_path, NULL, | |
8b1327f6 | 596 | inode->i_sb, xid, NULL); |
1da177e4 LT |
597 | |
598 | if (rc != 0) { | |
f96637be JP |
599 | cifs_dbg(FYI, "Create symlink ok, getinodeinfo fail rc = %d\n", |
600 | rc); | |
1da177e4 | 601 | } else { |
1da177e4 LT |
602 | d_instantiate(direntry, newinode); |
603 | } | |
604 | } | |
7ffec372 | 605 | symlink_exit: |
f99d49ad | 606 | kfree(full_path); |
7ffec372 | 607 | cifs_put_tlink(tlink); |
6d5786a3 | 608 | free_xid(xid); |
1da177e4 LT |
609 | return rc; |
610 | } |