Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: LGPL-2.1
2/*
3 *
4 * Copyright (C) International Business Machines Corp., 2002,2008
5 * Author(s): Steve French (sfrench@us.ibm.com)
6 *
7 */
8#include <linux/fs.h>
9#include <linux/stat.h>
10#include <linux/slab.h>
11#include <linux/namei.h>
12#include "cifsfs.h"
13#include "cifspdu.h"
14#include "cifsglob.h"
15#include "cifsproto.h"
16#include "cifs_debug.h"
17#include "cifs_fs_sb.h"
18#include "cifs_unicode.h"
19#include "smb2proto.h"
20#include "cifs_ioctl.h"
21
22/*
23 * M-F Symlink Functions - Begin
24 */
25
26#define CIFS_MF_SYMLINK_LEN_OFFSET (4+1)
27#define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1))
28#define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1))
29#define CIFS_MF_SYMLINK_LINK_MAXLEN (1024)
30#define CIFS_MF_SYMLINK_FILE_SIZE \
31 (CIFS_MF_SYMLINK_LINK_OFFSET + CIFS_MF_SYMLINK_LINK_MAXLEN)
32
33#define CIFS_MF_SYMLINK_LEN_FORMAT "XSym\n%04u\n"
34#define CIFS_MF_SYMLINK_MD5_FORMAT "%16phN\n"
35#define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) md5_hash
36
37static int
38symlink_hash(unsigned int link_len, const char *link_str, u8 *md5_hash)
39{
40 int rc;
41 struct crypto_shash *md5 = NULL;
42 struct sdesc *sdescmd5 = NULL;
43
44 rc = cifs_alloc_hash("md5", &md5, &sdescmd5);
45 if (rc)
46 goto symlink_hash_err;
47
48 rc = crypto_shash_init(&sdescmd5->shash);
49 if (rc) {
50 cifs_dbg(VFS, "%s: Could not init md5 shash\n", __func__);
51 goto symlink_hash_err;
52 }
53 rc = crypto_shash_update(&sdescmd5->shash, link_str, link_len);
54 if (rc) {
55 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
56 goto symlink_hash_err;
57 }
58 rc = crypto_shash_final(&sdescmd5->shash, md5_hash);
59 if (rc)
60 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
61
62symlink_hash_err:
63 cifs_free_hash(&md5, &sdescmd5);
64 return rc;
65}
66
67static int
68parse_mf_symlink(const u8 *buf, unsigned int buf_len, unsigned int *_link_len,
69 char **_link_str)
70{
71 int rc;
72 unsigned int link_len;
73 const char *md5_str1;
74 const char *link_str;
75 u8 md5_hash[16];
76 char md5_str2[34];
77
78 if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
79 return -EINVAL;
80
81 md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET];
82 link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET];
83
84 rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len);
85 if (rc != 1)
86 return -EINVAL;
87
88 if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN)
89 return -EINVAL;
90
91 rc = symlink_hash(link_len, link_str, md5_hash);
92 if (rc) {
93 cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc);
94 return rc;
95 }
96
97 scnprintf(md5_str2, sizeof(md5_str2),
98 CIFS_MF_SYMLINK_MD5_FORMAT,
99 CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
100
101 if (strncmp(md5_str1, md5_str2, 17) != 0)
102 return -EINVAL;
103
104 if (_link_str) {
105 *_link_str = kstrndup(link_str, link_len, GFP_KERNEL);
106 if (!*_link_str)
107 return -ENOMEM;
108 }
109
110 *_link_len = link_len;
111 return 0;
112}
113
114static int
115format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str)
116{
117 int rc;
118 unsigned int link_len;
119 unsigned int ofs;
120 u8 md5_hash[16];
121
122 if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
123 return -EINVAL;
124
125 link_len = strlen(link_str);
126
127 if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN)
128 return -ENAMETOOLONG;
129
130 rc = symlink_hash(link_len, link_str, md5_hash);
131 if (rc) {
132 cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc);
133 return rc;
134 }
135
136 scnprintf(buf, buf_len,
137 CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT,
138 link_len,
139 CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
140
141 ofs = CIFS_MF_SYMLINK_LINK_OFFSET;
142 memcpy(buf + ofs, link_str, link_len);
143
144 ofs += link_len;
145 if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
146 buf[ofs] = '\n';
147 ofs++;
148 }
149
150 while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
151 buf[ofs] = ' ';
152 ofs++;
153 }
154
155 return 0;
156}
157
158bool
159couldbe_mf_symlink(const struct cifs_fattr *fattr)
160{
161 if (!S_ISREG(fattr->cf_mode))
162 /* it's not a symlink */
163 return false;
164
165 if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
166 /* it's not a symlink */
167 return false;
168
169 return true;
170}
171
172static int
173create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
174 struct cifs_sb_info *cifs_sb, const char *fromName,
175 const char *toName)
176{
177 int rc;
178 u8 *buf;
179 unsigned int bytes_written = 0;
180
181 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
182 if (!buf)
183 return -ENOMEM;
184
185 rc = format_mf_symlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
186 if (rc)
187 goto out;
188
189 if (tcon->ses->server->ops->create_mf_symlink)
190 rc = tcon->ses->server->ops->create_mf_symlink(xid, tcon,
191 cifs_sb, fromName, buf, &bytes_written);
192 else
193 rc = -EOPNOTSUPP;
194
195 if (rc)
196 goto out;
197
198 if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
199 rc = -EIO;
200out:
201 kfree(buf);
202 return rc;
203}
204
205static int
206query_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
207 struct cifs_sb_info *cifs_sb, const unsigned char *path,
208 char **symlinkinfo)
209{
210 int rc;
211 u8 *buf = NULL;
212 unsigned int link_len = 0;
213 unsigned int bytes_read = 0;
214
215 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
216 if (!buf)
217 return -ENOMEM;
218
219 if (tcon->ses->server->ops->query_mf_symlink)
220 rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
221 cifs_sb, path, buf, &bytes_read);
222 else
223 rc = -ENOSYS;
224
225 if (rc)
226 goto out;
227
228 if (bytes_read == 0) { /* not a symlink */
229 rc = -EINVAL;
230 goto out;
231 }
232
233 rc = parse_mf_symlink(buf, bytes_read, &link_len, symlinkinfo);
234out:
235 kfree(buf);
236 return rc;
237}
238
239int
240check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
241 struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
242 const unsigned char *path)
243{
244 int rc;
245 u8 *buf = NULL;
246 unsigned int link_len = 0;
247 unsigned int bytes_read = 0;
248
249 if (!couldbe_mf_symlink(fattr))
250 /* it's not a symlink */
251 return 0;
252
253 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
254 if (!buf)
255 return -ENOMEM;
256
257 if (tcon->ses->server->ops->query_mf_symlink)
258 rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
259 cifs_sb, path, buf, &bytes_read);
260 else
261 rc = -ENOSYS;
262
263 if (rc)
264 goto out;
265
266 if (bytes_read == 0) /* not a symlink */
267 goto out;
268
269 rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL);
270 if (rc == -EINVAL) {
271 /* it's not a symlink */
272 rc = 0;
273 goto out;
274 }
275
276 if (rc != 0)
277 goto out;
278
279 /* it is a symlink */
280 fattr->cf_eof = link_len;
281 fattr->cf_mode &= ~S_IFMT;
282 fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
283 fattr->cf_dtype = DT_LNK;
284out:
285 kfree(buf);
286 return rc;
287}
288
289#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
290/*
291 * SMB 1.0 Protocol specific functions
292 */
293
294int
295cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
296 struct cifs_sb_info *cifs_sb, const unsigned char *path,
297 char *pbuf, unsigned int *pbytes_read)
298{
299 int rc;
300 int oplock = 0;
301 struct cifs_fid fid;
302 struct cifs_open_parms oparms;
303 struct cifs_io_parms io_parms = {0};
304 int buf_type = CIFS_NO_BUFFER;
305 FILE_ALL_INFO file_info;
306
307 oparms.tcon = tcon;
308 oparms.cifs_sb = cifs_sb;
309 oparms.desired_access = GENERIC_READ;
310 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
311 oparms.disposition = FILE_OPEN;
312 oparms.path = path;
313 oparms.fid = &fid;
314 oparms.reconnect = false;
315
316 rc = CIFS_open(xid, &oparms, &oplock, &file_info);
317 if (rc)
318 return rc;
319
320 if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
321 rc = -ENOENT;
322 /* it's not a symlink */
323 goto out;
324 }
325
326 io_parms.netfid = fid.netfid;
327 io_parms.pid = current->tgid;
328 io_parms.tcon = tcon;
329 io_parms.offset = 0;
330 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
331
332 rc = CIFSSMBRead(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
333out:
334 CIFSSMBClose(xid, tcon, fid.netfid);
335 return rc;
336}
337
338int
339cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
340 struct cifs_sb_info *cifs_sb, const unsigned char *path,
341 char *pbuf, unsigned int *pbytes_written)
342{
343 int rc;
344 int oplock = 0;
345 struct cifs_fid fid;
346 struct cifs_open_parms oparms;
347 struct cifs_io_parms io_parms = {0};
348
349 oparms.tcon = tcon;
350 oparms.cifs_sb = cifs_sb;
351 oparms.desired_access = GENERIC_WRITE;
352 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
353 oparms.disposition = FILE_CREATE;
354 oparms.path = path;
355 oparms.fid = &fid;
356 oparms.reconnect = false;
357
358 rc = CIFS_open(xid, &oparms, &oplock, NULL);
359 if (rc)
360 return rc;
361
362 io_parms.netfid = fid.netfid;
363 io_parms.pid = current->tgid;
364 io_parms.tcon = tcon;
365 io_parms.offset = 0;
366 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
367
368 rc = CIFSSMBWrite(xid, &io_parms, pbytes_written, pbuf);
369 CIFSSMBClose(xid, tcon, fid.netfid);
370 return rc;
371}
372#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
373
374/*
375 * SMB 2.1/SMB3 Protocol specific functions
376 */
377int
378smb3_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
379 struct cifs_sb_info *cifs_sb, const unsigned char *path,
380 char *pbuf, unsigned int *pbytes_read)
381{
382 int rc;
383 struct cifs_fid fid;
384 struct cifs_open_parms oparms;
385 struct cifs_io_parms io_parms = {0};
386 int buf_type = CIFS_NO_BUFFER;
387 __le16 *utf16_path;
388 __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
389 struct smb2_file_all_info *pfile_info = NULL;
390
391 oparms.tcon = tcon;
392 oparms.cifs_sb = cifs_sb;
393 oparms.desired_access = GENERIC_READ;
394 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
395 oparms.disposition = FILE_OPEN;
396 oparms.fid = &fid;
397 oparms.reconnect = false;
398
399 utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
400 if (utf16_path == NULL)
401 return -ENOMEM;
402
403 pfile_info = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
404 GFP_KERNEL);
405
406 if (pfile_info == NULL) {
407 kfree(utf16_path);
408 return -ENOMEM;
409 }
410
411 rc = SMB2_open(xid, &oparms, utf16_path, &oplock, pfile_info, NULL,
412 NULL, NULL);
413 if (rc)
414 goto qmf_out_open_fail;
415
416 if (pfile_info->EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
417 /* it's not a symlink */
418 rc = -ENOENT; /* Is there a better rc to return? */
419 goto qmf_out;
420 }
421
422 io_parms.netfid = fid.netfid;
423 io_parms.pid = current->tgid;
424 io_parms.tcon = tcon;
425 io_parms.offset = 0;
426 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
427 io_parms.persistent_fid = fid.persistent_fid;
428 io_parms.volatile_fid = fid.volatile_fid;
429 rc = SMB2_read(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
430qmf_out:
431 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
432qmf_out_open_fail:
433 kfree(utf16_path);
434 kfree(pfile_info);
435 return rc;
436}
437
438int
439smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
440 struct cifs_sb_info *cifs_sb, const unsigned char *path,
441 char *pbuf, unsigned int *pbytes_written)
442{
443 int rc;
444 struct cifs_fid fid;
445 struct cifs_open_parms oparms;
446 struct cifs_io_parms io_parms = {0};
447 __le16 *utf16_path;
448 __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
449 struct kvec iov[2];
450
451 cifs_dbg(FYI, "%s: path: %s\n", __func__, path);
452
453 utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
454 if (!utf16_path)
455 return -ENOMEM;
456
457 oparms.tcon = tcon;
458 oparms.cifs_sb = cifs_sb;
459 oparms.desired_access = GENERIC_WRITE;
460 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
461 oparms.disposition = FILE_CREATE;
462 oparms.fid = &fid;
463 oparms.reconnect = false;
464
465 rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
466 NULL, NULL);
467 if (rc) {
468 kfree(utf16_path);
469 return rc;
470 }
471
472 io_parms.netfid = fid.netfid;
473 io_parms.pid = current->tgid;
474 io_parms.tcon = tcon;
475 io_parms.offset = 0;
476 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
477 io_parms.persistent_fid = fid.persistent_fid;
478 io_parms.volatile_fid = fid.volatile_fid;
479
480 /* iov[0] is reserved for smb header */
481 iov[1].iov_base = pbuf;
482 iov[1].iov_len = CIFS_MF_SYMLINK_FILE_SIZE;
483
484 rc = SMB2_write(xid, &io_parms, pbytes_written, iov, 1);
485
486 /* Make sure we wrote all of the symlink data */
487 if ((rc == 0) && (*pbytes_written != CIFS_MF_SYMLINK_FILE_SIZE))
488 rc = -EIO;
489
490 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
491
492 kfree(utf16_path);
493 return rc;
494}
495
496/*
497 * M-F Symlink Functions - End
498 */
499
500int
501cifs_hardlink(struct dentry *old_file, struct inode *inode,
502 struct dentry *direntry)
503{
504 int rc = -EACCES;
505 unsigned int xid;
506 const char *from_name, *to_name;
507 void *page1, *page2;
508 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
509 struct tcon_link *tlink;
510 struct cifs_tcon *tcon;
511 struct TCP_Server_Info *server;
512 struct cifsInodeInfo *cifsInode;
513
514 if (unlikely(cifs_forced_shutdown(cifs_sb)))
515 return -EIO;
516
517 tlink = cifs_sb_tlink(cifs_sb);
518 if (IS_ERR(tlink))
519 return PTR_ERR(tlink);
520 tcon = tlink_tcon(tlink);
521
522 xid = get_xid();
523 page1 = alloc_dentry_path();
524 page2 = alloc_dentry_path();
525
526 from_name = build_path_from_dentry(old_file, page1);
527 if (IS_ERR(from_name)) {
528 rc = PTR_ERR(from_name);
529 goto cifs_hl_exit;
530 }
531 to_name = build_path_from_dentry(direntry, page2);
532 if (IS_ERR(to_name)) {
533 rc = PTR_ERR(to_name);
534 goto cifs_hl_exit;
535 }
536
537#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
538 if (tcon->unix_ext)
539 rc = CIFSUnixCreateHardLink(xid, tcon, from_name, to_name,
540 cifs_sb->local_nls,
541 cifs_remap(cifs_sb));
542 else {
543#else
544 {
545#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
546 server = tcon->ses->server;
547 if (!server->ops->create_hardlink) {
548 rc = -ENOSYS;
549 goto cifs_hl_exit;
550 }
551 rc = server->ops->create_hardlink(xid, tcon, from_name, to_name,
552 cifs_sb);
553 if ((rc == -EIO) || (rc == -EINVAL))
554 rc = -EOPNOTSUPP;
555 }
556
557 d_drop(direntry); /* force new lookup from server of target */
558
559 /*
560 * if source file is cached (oplocked) revalidate will not go to server
561 * until the file is closed or oplock broken so update nlinks locally
562 */
563 if (d_really_is_positive(old_file)) {
564 cifsInode = CIFS_I(d_inode(old_file));
565 if (rc == 0) {
566 spin_lock(&d_inode(old_file)->i_lock);
567 inc_nlink(d_inode(old_file));
568 spin_unlock(&d_inode(old_file)->i_lock);
569
570 /*
571 * parent dir timestamps will update from srv within a
572 * second, would it really be worth it to set the parent
573 * dir cifs inode time to zero to force revalidate
574 * (faster) for it too?
575 */
576 }
577 /*
578 * if not oplocked will force revalidate to get info on source
579 * file from srv. Note Samba server prior to 4.2 has bug -
580 * not updating src file ctime on hardlinks but Windows servers
581 * handle it properly
582 */
583 cifsInode->time = 0;
584
585 /*
586 * Will update parent dir timestamps from srv within a second.
587 * Would it really be worth it to set the parent dir (cifs
588 * inode) time field to zero to force revalidate on parent
589 * directory faster ie
590 *
591 * CIFS_I(inode)->time = 0;
592 */
593 }
594
595cifs_hl_exit:
596 free_dentry_path(page1);
597 free_dentry_path(page2);
598 free_xid(xid);
599 cifs_put_tlink(tlink);
600 return rc;
601}
602
603const char *
604cifs_get_link(struct dentry *direntry, struct inode *inode,
605 struct delayed_call *done)
606{
607 int rc = -ENOMEM;
608 unsigned int xid;
609 const char *full_path;
610 void *page;
611 char *target_path = NULL;
612 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
613 struct tcon_link *tlink = NULL;
614 struct cifs_tcon *tcon;
615 struct TCP_Server_Info *server;
616
617 if (!direntry)
618 return ERR_PTR(-ECHILD);
619
620 xid = get_xid();
621
622 tlink = cifs_sb_tlink(cifs_sb);
623 if (IS_ERR(tlink)) {
624 free_xid(xid);
625 return ERR_CAST(tlink);
626 }
627 tcon = tlink_tcon(tlink);
628 server = tcon->ses->server;
629
630 page = alloc_dentry_path();
631 full_path = build_path_from_dentry(direntry, page);
632 if (IS_ERR(full_path)) {
633 free_xid(xid);
634 cifs_put_tlink(tlink);
635 free_dentry_path(page);
636 return ERR_CAST(full_path);
637 }
638
639 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", full_path, inode);
640
641 rc = -EACCES;
642 /*
643 * First try Minshall+French Symlinks, if configured
644 * and fallback to UNIX Extensions Symlinks.
645 */
646 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
647 rc = query_mf_symlink(xid, tcon, cifs_sb, full_path,
648 &target_path);
649
650 if (rc != 0 && server->ops->query_symlink) {
651 struct cifsInodeInfo *cifsi = CIFS_I(inode);
652 bool reparse_point = false;
653
654 if (cifsi->cifsAttrs & ATTR_REPARSE)
655 reparse_point = true;
656
657 rc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path,
658 &target_path, reparse_point);
659 }
660
661 free_dentry_path(page);
662 free_xid(xid);
663 cifs_put_tlink(tlink);
664 if (rc != 0) {
665 kfree(target_path);
666 return ERR_PTR(rc);
667 }
668 set_delayed_call(done, kfree_link, target_path);
669 return target_path;
670}
671
672int
673cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
674 struct dentry *direntry, const char *symname)
675{
676 int rc = -EOPNOTSUPP;
677 unsigned int xid;
678 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
679 struct tcon_link *tlink;
680 struct cifs_tcon *pTcon;
681 const char *full_path;
682 void *page;
683 struct inode *newinode = NULL;
684
685 if (unlikely(cifs_forced_shutdown(cifs_sb)))
686 return -EIO;
687
688 page = alloc_dentry_path();
689 if (!page)
690 return -ENOMEM;
691
692 xid = get_xid();
693
694 tlink = cifs_sb_tlink(cifs_sb);
695 if (IS_ERR(tlink)) {
696 rc = PTR_ERR(tlink);
697 goto symlink_exit;
698 }
699 pTcon = tlink_tcon(tlink);
700
701 full_path = build_path_from_dentry(direntry, page);
702 if (IS_ERR(full_path)) {
703 rc = PTR_ERR(full_path);
704 goto symlink_exit;
705 }
706
707 cifs_dbg(FYI, "Full path: %s\n", full_path);
708 cifs_dbg(FYI, "symname is %s\n", symname);
709
710 /* BB what if DFS and this volume is on different share? BB */
711 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
712 rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname);
713#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
714 else if (pTcon->unix_ext)
715 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
716 cifs_sb->local_nls,
717 cifs_remap(cifs_sb));
718#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
719 /* else
720 rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
721 cifs_sb_target->local_nls); */
722
723 if (rc == 0) {
724 if (pTcon->posix_extensions)
725 rc = smb311_posix_get_inode_info(&newinode, full_path, inode->i_sb, xid);
726 else if (pTcon->unix_ext)
727 rc = cifs_get_inode_info_unix(&newinode, full_path,
728 inode->i_sb, xid);
729 else
730 rc = cifs_get_inode_info(&newinode, full_path, NULL,
731 inode->i_sb, xid, NULL);
732
733 if (rc != 0) {
734 cifs_dbg(FYI, "Create symlink ok, getinodeinfo fail rc = %d\n",
735 rc);
736 } else {
737 d_instantiate(direntry, newinode);
738 }
739 }
740symlink_exit:
741 free_dentry_path(page);
742 cifs_put_tlink(tlink);
743 free_xid(xid);
744 return rc;
745}