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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 shash_desc *md5 = NULL;
42
43 rc = cifs_alloc_hash("md5", &md5);
44 if (rc)
45 goto symlink_hash_err;
46
47 rc = crypto_shash_init(md5);
48 if (rc) {
49 cifs_dbg(VFS, "%s: Could not init md5 shash\n", __func__);
50 goto symlink_hash_err;
51 }
52 rc = crypto_shash_update(md5, link_str, link_len);
53 if (rc) {
54 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
55 goto symlink_hash_err;
56 }
57 rc = crypto_shash_final(md5, md5_hash);
58 if (rc)
59 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
60
61symlink_hash_err:
62 cifs_free_hash(&md5);
63 return rc;
64}
65
66static int
67parse_mf_symlink(const u8 *buf, unsigned int buf_len, unsigned int *_link_len,
68 char **_link_str)
69{
70 int rc;
71 unsigned int link_len;
72 const char *md5_str1;
73 const char *link_str;
74 u8 md5_hash[16];
75 char md5_str2[34];
76
77 if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
78 return -EINVAL;
79
80 md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET];
81 link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET];
82
83 rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len);
84 if (rc != 1)
85 return -EINVAL;
86
87 if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN)
88 return -EINVAL;
89
90 rc = symlink_hash(link_len, link_str, md5_hash);
91 if (rc) {
92 cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc);
93 return rc;
94 }
95
96 scnprintf(md5_str2, sizeof(md5_str2),
97 CIFS_MF_SYMLINK_MD5_FORMAT,
98 CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
99
100 if (strncmp(md5_str1, md5_str2, 17) != 0)
101 return -EINVAL;
102
103 if (_link_str) {
104 *_link_str = kstrndup(link_str, link_len, GFP_KERNEL);
105 if (!*_link_str)
106 return -ENOMEM;
107 }
108
109 *_link_len = link_len;
110 return 0;
111}
112
113static int
114format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str)
115{
116 int rc;
117 unsigned int link_len;
118 unsigned int ofs;
119 u8 md5_hash[16];
120
121 if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
122 return -EINVAL;
123
124 link_len = strlen(link_str);
125
126 if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN)
127 return -ENAMETOOLONG;
128
129 rc = symlink_hash(link_len, link_str, md5_hash);
130 if (rc) {
131 cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc);
132 return rc;
133 }
134
135 scnprintf(buf, buf_len,
136 CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT,
137 link_len,
138 CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
139
140 ofs = CIFS_MF_SYMLINK_LINK_OFFSET;
141 memcpy(buf + ofs, link_str, link_len);
142
143 ofs += link_len;
144 if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
145 buf[ofs] = '\n';
146 ofs++;
147 }
148
149 while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
150 buf[ofs] = ' ';
151 ofs++;
152 }
153
154 return 0;
155}
156
157bool
158couldbe_mf_symlink(const struct cifs_fattr *fattr)
159{
160 if (!S_ISREG(fattr->cf_mode))
161 /* it's not a symlink */
162 return false;
163
164 if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
165 /* it's not a symlink */
166 return false;
167
168 return true;
169}
170
171static int
172create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
173 struct cifs_sb_info *cifs_sb, const char *fromName,
174 const char *toName)
175{
176 int rc;
177 u8 *buf;
178 unsigned int bytes_written = 0;
179
180 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
181 if (!buf)
182 return -ENOMEM;
183
184 rc = format_mf_symlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
185 if (rc)
186 goto out;
187
188 if (tcon->ses->server->ops->create_mf_symlink)
189 rc = tcon->ses->server->ops->create_mf_symlink(xid, tcon,
190 cifs_sb, fromName, buf, &bytes_written);
191 else
192 rc = -EOPNOTSUPP;
193
194 if (rc)
195 goto out;
196
197 if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
198 rc = -EIO;
199out:
200 kfree(buf);
201 return rc;
202}
203
204int
205check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
206 struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
207 const unsigned char *path)
208{
209 int rc;
210 u8 *buf = NULL;
211 unsigned int link_len = 0;
212 unsigned int bytes_read = 0;
213 char *symlink = NULL;
214
215 if (!couldbe_mf_symlink(fattr))
216 /* it's not a symlink */
217 return 0;
218
219 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
220 if (!buf)
221 return -ENOMEM;
222
223 if (tcon->ses->server->ops->query_mf_symlink)
224 rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
225 cifs_sb, path, buf, &bytes_read);
226 else
227 rc = -ENOSYS;
228
229 if (rc)
230 goto out;
231
232 if (bytes_read == 0) /* not a symlink */
233 goto out;
234
235 rc = parse_mf_symlink(buf, bytes_read, &link_len, &symlink);
236 if (rc == -EINVAL) {
237 /* it's not a symlink */
238 rc = 0;
239 goto out;
240 }
241
242 if (rc != 0)
243 goto out;
244
245 /* it is a symlink */
246 fattr->cf_eof = link_len;
247 fattr->cf_mode &= ~S_IFMT;
248 fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
249 fattr->cf_dtype = DT_LNK;
250 fattr->cf_symlink_target = symlink;
251out:
252 kfree(buf);
253 return rc;
254}
255
256#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
257/*
258 * SMB 1.0 Protocol specific functions
259 */
260
261int
262cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
263 struct cifs_sb_info *cifs_sb, const unsigned char *path,
264 char *pbuf, unsigned int *pbytes_read)
265{
266 int rc;
267 int oplock = 0;
268 struct cifs_fid fid;
269 struct cifs_open_parms oparms;
270 struct cifs_io_parms io_parms = {0};
271 int buf_type = CIFS_NO_BUFFER;
272 FILE_ALL_INFO file_info;
273
274 oparms.tcon = tcon;
275 oparms.cifs_sb = cifs_sb;
276 oparms.desired_access = GENERIC_READ;
277 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
278 oparms.disposition = FILE_OPEN;
279 oparms.path = path;
280 oparms.fid = &fid;
281 oparms.reconnect = false;
282
283 rc = CIFS_open(xid, &oparms, &oplock, &file_info);
284 if (rc)
285 return rc;
286
287 if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
288 rc = -ENOENT;
289 /* it's not a symlink */
290 goto out;
291 }
292
293 io_parms.netfid = fid.netfid;
294 io_parms.pid = current->tgid;
295 io_parms.tcon = tcon;
296 io_parms.offset = 0;
297 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
298
299 rc = CIFSSMBRead(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
300out:
301 CIFSSMBClose(xid, tcon, fid.netfid);
302 return rc;
303}
304
305int
306cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
307 struct cifs_sb_info *cifs_sb, const unsigned char *path,
308 char *pbuf, unsigned int *pbytes_written)
309{
310 int rc;
311 int oplock = 0;
312 struct cifs_fid fid;
313 struct cifs_open_parms oparms;
314 struct cifs_io_parms io_parms = {0};
315
316 oparms.tcon = tcon;
317 oparms.cifs_sb = cifs_sb;
318 oparms.desired_access = GENERIC_WRITE;
319 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
320 oparms.disposition = FILE_CREATE;
321 oparms.path = path;
322 oparms.fid = &fid;
323 oparms.reconnect = false;
324
325 rc = CIFS_open(xid, &oparms, &oplock, NULL);
326 if (rc)
327 return rc;
328
329 io_parms.netfid = fid.netfid;
330 io_parms.pid = current->tgid;
331 io_parms.tcon = tcon;
332 io_parms.offset = 0;
333 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
334
335 rc = CIFSSMBWrite(xid, &io_parms, pbytes_written, pbuf);
336 CIFSSMBClose(xid, tcon, fid.netfid);
337 return rc;
338}
339#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
340
341/*
342 * SMB 2.1/SMB3 Protocol specific functions
343 */
344int
345smb3_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
346 struct cifs_sb_info *cifs_sb, const unsigned char *path,
347 char *pbuf, unsigned int *pbytes_read)
348{
349 int rc;
350 struct cifs_fid fid;
351 struct cifs_open_parms oparms;
352 struct cifs_io_parms io_parms = {0};
353 int buf_type = CIFS_NO_BUFFER;
354 __le16 *utf16_path;
355 __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
356 struct smb2_file_all_info *pfile_info = NULL;
357
358 oparms.tcon = tcon;
359 oparms.cifs_sb = cifs_sb;
360 oparms.desired_access = GENERIC_READ;
361 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
362 oparms.disposition = FILE_OPEN;
363 oparms.fid = &fid;
364 oparms.reconnect = false;
365
366 utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
367 if (utf16_path == NULL)
368 return -ENOMEM;
369
370 pfile_info = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
371 GFP_KERNEL);
372
373 if (pfile_info == NULL) {
374 kfree(utf16_path);
375 return -ENOMEM;
376 }
377
378 rc = SMB2_open(xid, &oparms, utf16_path, &oplock, pfile_info, NULL,
379 NULL, NULL);
380 if (rc)
381 goto qmf_out_open_fail;
382
383 if (pfile_info->EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
384 /* it's not a symlink */
385 rc = -ENOENT; /* Is there a better rc to return? */
386 goto qmf_out;
387 }
388
389 io_parms.netfid = fid.netfid;
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 io_parms.persistent_fid = fid.persistent_fid;
395 io_parms.volatile_fid = fid.volatile_fid;
396 rc = SMB2_read(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
397qmf_out:
398 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
399qmf_out_open_fail:
400 kfree(utf16_path);
401 kfree(pfile_info);
402 return rc;
403}
404
405int
406smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
407 struct cifs_sb_info *cifs_sb, const unsigned char *path,
408 char *pbuf, unsigned int *pbytes_written)
409{
410 int rc;
411 struct cifs_fid fid;
412 struct cifs_open_parms oparms;
413 struct cifs_io_parms io_parms = {0};
414 __le16 *utf16_path;
415 __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
416 struct kvec iov[2];
417
418 cifs_dbg(FYI, "%s: path: %s\n", __func__, path);
419
420 utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
421 if (!utf16_path)
422 return -ENOMEM;
423
424 oparms.tcon = tcon;
425 oparms.cifs_sb = cifs_sb;
426 oparms.desired_access = GENERIC_WRITE;
427 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
428 oparms.disposition = FILE_CREATE;
429 oparms.fid = &fid;
430 oparms.reconnect = false;
431 oparms.mode = 0644;
432
433 rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
434 NULL, NULL);
435 if (rc) {
436 kfree(utf16_path);
437 return rc;
438 }
439
440 io_parms.netfid = fid.netfid;
441 io_parms.pid = current->tgid;
442 io_parms.tcon = tcon;
443 io_parms.offset = 0;
444 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
445 io_parms.persistent_fid = fid.persistent_fid;
446 io_parms.volatile_fid = fid.volatile_fid;
447
448 /* iov[0] is reserved for smb header */
449 iov[1].iov_base = pbuf;
450 iov[1].iov_len = CIFS_MF_SYMLINK_FILE_SIZE;
451
452 rc = SMB2_write(xid, &io_parms, pbytes_written, iov, 1);
453
454 /* Make sure we wrote all of the symlink data */
455 if ((rc == 0) && (*pbytes_written != CIFS_MF_SYMLINK_FILE_SIZE))
456 rc = -EIO;
457
458 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
459
460 kfree(utf16_path);
461 return rc;
462}
463
464/*
465 * M-F Symlink Functions - End
466 */
467
468int
469cifs_hardlink(struct dentry *old_file, struct inode *inode,
470 struct dentry *direntry)
471{
472 int rc = -EACCES;
473 unsigned int xid;
474 const char *from_name, *to_name;
475 void *page1, *page2;
476 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
477 struct tcon_link *tlink;
478 struct cifs_tcon *tcon;
479 struct TCP_Server_Info *server;
480 struct cifsInodeInfo *cifsInode;
481
482 if (unlikely(cifs_forced_shutdown(cifs_sb)))
483 return -EIO;
484
485 tlink = cifs_sb_tlink(cifs_sb);
486 if (IS_ERR(tlink))
487 return PTR_ERR(tlink);
488 tcon = tlink_tcon(tlink);
489
490 xid = get_xid();
491 page1 = alloc_dentry_path();
492 page2 = alloc_dentry_path();
493
494 from_name = build_path_from_dentry(old_file, page1);
495 if (IS_ERR(from_name)) {
496 rc = PTR_ERR(from_name);
497 goto cifs_hl_exit;
498 }
499 to_name = build_path_from_dentry(direntry, page2);
500 if (IS_ERR(to_name)) {
501 rc = PTR_ERR(to_name);
502 goto cifs_hl_exit;
503 }
504
505#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
506 if (tcon->unix_ext)
507 rc = CIFSUnixCreateHardLink(xid, tcon, from_name, to_name,
508 cifs_sb->local_nls,
509 cifs_remap(cifs_sb));
510 else {
511#else
512 {
513#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
514 server = tcon->ses->server;
515 if (!server->ops->create_hardlink) {
516 rc = -ENOSYS;
517 goto cifs_hl_exit;
518 }
519 rc = server->ops->create_hardlink(xid, tcon, from_name, to_name,
520 cifs_sb);
521 if ((rc == -EIO) || (rc == -EINVAL))
522 rc = -EOPNOTSUPP;
523 }
524
525 d_drop(direntry); /* force new lookup from server of target */
526
527 /*
528 * if source file is cached (oplocked) revalidate will not go to server
529 * until the file is closed or oplock broken so update nlinks locally
530 */
531 if (d_really_is_positive(old_file)) {
532 cifsInode = CIFS_I(d_inode(old_file));
533 if (rc == 0) {
534 spin_lock(&d_inode(old_file)->i_lock);
535 inc_nlink(d_inode(old_file));
536 spin_unlock(&d_inode(old_file)->i_lock);
537
538 /*
539 * parent dir timestamps will update from srv within a
540 * second, would it really be worth it to set the parent
541 * dir cifs inode time to zero to force revalidate
542 * (faster) for it too?
543 */
544 }
545 /*
546 * if not oplocked will force revalidate to get info on source
547 * file from srv. Note Samba server prior to 4.2 has bug -
548 * not updating src file ctime on hardlinks but Windows servers
549 * handle it properly
550 */
551 cifsInode->time = 0;
552
553 /*
554 * Will update parent dir timestamps from srv within a second.
555 * Would it really be worth it to set the parent dir (cifs
556 * inode) time field to zero to force revalidate on parent
557 * directory faster ie
558 *
559 * CIFS_I(inode)->time = 0;
560 */
561 }
562
563cifs_hl_exit:
564 free_dentry_path(page1);
565 free_dentry_path(page2);
566 free_xid(xid);
567 cifs_put_tlink(tlink);
568 return rc;
569}
570
571int
572cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
573 struct dentry *direntry, const char *symname)
574{
575 int rc = -EOPNOTSUPP;
576 unsigned int xid;
577 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
578 struct tcon_link *tlink;
579 struct cifs_tcon *pTcon;
580 const char *full_path;
581 void *page;
582 struct inode *newinode = NULL;
583
584 if (unlikely(cifs_forced_shutdown(cifs_sb)))
585 return -EIO;
586
587 page = alloc_dentry_path();
588 if (!page)
589 return -ENOMEM;
590
591 xid = get_xid();
592
593 tlink = cifs_sb_tlink(cifs_sb);
594 if (IS_ERR(tlink)) {
595 rc = PTR_ERR(tlink);
596 goto symlink_exit;
597 }
598 pTcon = tlink_tcon(tlink);
599
600 full_path = build_path_from_dentry(direntry, page);
601 if (IS_ERR(full_path)) {
602 rc = PTR_ERR(full_path);
603 goto symlink_exit;
604 }
605
606 cifs_dbg(FYI, "Full path: %s\n", full_path);
607 cifs_dbg(FYI, "symname is %s\n", symname);
608
609 /* BB what if DFS and this volume is on different share? BB */
610 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
611 rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname);
612#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
613 else if (pTcon->unix_ext)
614 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
615 cifs_sb->local_nls,
616 cifs_remap(cifs_sb));
617#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
618 /* else
619 rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
620 cifs_sb_target->local_nls); */
621
622 if (rc == 0) {
623 if (pTcon->posix_extensions)
624 rc = smb311_posix_get_inode_info(&newinode, full_path, inode->i_sb, xid);
625 else if (pTcon->unix_ext)
626 rc = cifs_get_inode_info_unix(&newinode, full_path,
627 inode->i_sb, xid);
628 else
629 rc = cifs_get_inode_info(&newinode, full_path, NULL,
630 inode->i_sb, xid, NULL);
631
632 if (rc != 0) {
633 cifs_dbg(FYI, "Create symlink ok, getinodeinfo fail rc = %d\n",
634 rc);
635 } else {
636 d_instantiate(direntry, newinode);
637 }
638 }
639symlink_exit:
640 free_dentry_path(page);
641 cifs_put_tlink(tlink);
642 free_xid(xid);
643 return rc;
644}
1// SPDX-License-Identifier: LGPL-2.1
2/*
3 * fs/cifs/link.c
4 *
5 * Copyright (C) International Business Machines Corp., 2002,2008
6 * Author(s): Steve French (sfrench@us.ibm.com)
7 *
8 */
9#include <linux/fs.h>
10#include <linux/stat.h>
11#include <linux/slab.h>
12#include <linux/namei.h>
13#include "cifsfs.h"
14#include "cifspdu.h"
15#include "cifsglob.h"
16#include "cifsproto.h"
17#include "cifs_debug.h"
18#include "cifs_fs_sb.h"
19#include "cifs_unicode.h"
20#include "smb2proto.h"
21#include "cifs_ioctl.h"
22
23/*
24 * M-F Symlink Functions - Begin
25 */
26
27#define CIFS_MF_SYMLINK_LEN_OFFSET (4+1)
28#define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1))
29#define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1))
30#define CIFS_MF_SYMLINK_LINK_MAXLEN (1024)
31#define CIFS_MF_SYMLINK_FILE_SIZE \
32 (CIFS_MF_SYMLINK_LINK_OFFSET + CIFS_MF_SYMLINK_LINK_MAXLEN)
33
34#define CIFS_MF_SYMLINK_LEN_FORMAT "XSym\n%04u\n"
35#define CIFS_MF_SYMLINK_MD5_FORMAT "%16phN\n"
36#define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) md5_hash
37
38static int
39symlink_hash(unsigned int link_len, const char *link_str, u8 *md5_hash)
40{
41 int rc;
42 struct crypto_shash *md5 = NULL;
43 struct sdesc *sdescmd5 = NULL;
44
45 rc = cifs_alloc_hash("md5", &md5, &sdescmd5);
46 if (rc)
47 goto symlink_hash_err;
48
49 rc = crypto_shash_init(&sdescmd5->shash);
50 if (rc) {
51 cifs_dbg(VFS, "%s: Could not init md5 shash\n", __func__);
52 goto symlink_hash_err;
53 }
54 rc = crypto_shash_update(&sdescmd5->shash, link_str, link_len);
55 if (rc) {
56 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
57 goto symlink_hash_err;
58 }
59 rc = crypto_shash_final(&sdescmd5->shash, md5_hash);
60 if (rc)
61 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
62
63symlink_hash_err:
64 cifs_free_hash(&md5, &sdescmd5);
65 return rc;
66}
67
68static int
69parse_mf_symlink(const u8 *buf, unsigned int buf_len, unsigned int *_link_len,
70 char **_link_str)
71{
72 int rc;
73 unsigned int link_len;
74 const char *md5_str1;
75 const char *link_str;
76 u8 md5_hash[16];
77 char md5_str2[34];
78
79 if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
80 return -EINVAL;
81
82 md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET];
83 link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET];
84
85 rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len);
86 if (rc != 1)
87 return -EINVAL;
88
89 rc = symlink_hash(link_len, link_str, md5_hash);
90 if (rc) {
91 cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc);
92 return rc;
93 }
94
95 scnprintf(md5_str2, sizeof(md5_str2),
96 CIFS_MF_SYMLINK_MD5_FORMAT,
97 CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
98
99 if (strncmp(md5_str1, md5_str2, 17) != 0)
100 return -EINVAL;
101
102 if (_link_str) {
103 *_link_str = kstrndup(link_str, link_len, GFP_KERNEL);
104 if (!*_link_str)
105 return -ENOMEM;
106 }
107
108 *_link_len = link_len;
109 return 0;
110}
111
112static int
113format_mf_symlink(u8 *buf, unsigned int buf_len, const char *link_str)
114{
115 int rc;
116 unsigned int link_len;
117 unsigned int ofs;
118 u8 md5_hash[16];
119
120 if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
121 return -EINVAL;
122
123 link_len = strlen(link_str);
124
125 if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN)
126 return -ENAMETOOLONG;
127
128 rc = symlink_hash(link_len, link_str, md5_hash);
129 if (rc) {
130 cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc);
131 return rc;
132 }
133
134 scnprintf(buf, buf_len,
135 CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT,
136 link_len,
137 CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
138
139 ofs = CIFS_MF_SYMLINK_LINK_OFFSET;
140 memcpy(buf + ofs, link_str, link_len);
141
142 ofs += link_len;
143 if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
144 buf[ofs] = '\n';
145 ofs++;
146 }
147
148 while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
149 buf[ofs] = ' ';
150 ofs++;
151 }
152
153 return 0;
154}
155
156bool
157couldbe_mf_symlink(const struct cifs_fattr *fattr)
158{
159 if (!S_ISREG(fattr->cf_mode))
160 /* it's not a symlink */
161 return false;
162
163 if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
164 /* it's not a symlink */
165 return false;
166
167 return true;
168}
169
170static int
171create_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
172 struct cifs_sb_info *cifs_sb, const char *fromName,
173 const char *toName)
174{
175 int rc;
176 u8 *buf;
177 unsigned int bytes_written = 0;
178
179 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
180 if (!buf)
181 return -ENOMEM;
182
183 rc = format_mf_symlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
184 if (rc)
185 goto out;
186
187 if (tcon->ses->server->ops->create_mf_symlink)
188 rc = tcon->ses->server->ops->create_mf_symlink(xid, tcon,
189 cifs_sb, fromName, buf, &bytes_written);
190 else
191 rc = -EOPNOTSUPP;
192
193 if (rc)
194 goto out;
195
196 if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
197 rc = -EIO;
198out:
199 kfree(buf);
200 return rc;
201}
202
203static int
204query_mf_symlink(const unsigned int xid, struct cifs_tcon *tcon,
205 struct cifs_sb_info *cifs_sb, const unsigned char *path,
206 char **symlinkinfo)
207{
208 int rc;
209 u8 *buf = NULL;
210 unsigned int link_len = 0;
211 unsigned int bytes_read = 0;
212
213 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
214 if (!buf)
215 return -ENOMEM;
216
217 if (tcon->ses->server->ops->query_mf_symlink)
218 rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
219 cifs_sb, path, buf, &bytes_read);
220 else
221 rc = -ENOSYS;
222
223 if (rc)
224 goto out;
225
226 if (bytes_read == 0) { /* not a symlink */
227 rc = -EINVAL;
228 goto out;
229 }
230
231 rc = parse_mf_symlink(buf, bytes_read, &link_len, symlinkinfo);
232out:
233 kfree(buf);
234 return rc;
235}
236
237int
238check_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
239 struct cifs_sb_info *cifs_sb, struct cifs_fattr *fattr,
240 const unsigned char *path)
241{
242 int rc;
243 u8 *buf = NULL;
244 unsigned int link_len = 0;
245 unsigned int bytes_read = 0;
246
247 if (!couldbe_mf_symlink(fattr))
248 /* it's not a symlink */
249 return 0;
250
251 buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
252 if (!buf)
253 return -ENOMEM;
254
255 if (tcon->ses->server->ops->query_mf_symlink)
256 rc = tcon->ses->server->ops->query_mf_symlink(xid, tcon,
257 cifs_sb, path, buf, &bytes_read);
258 else
259 rc = -ENOSYS;
260
261 if (rc)
262 goto out;
263
264 if (bytes_read == 0) /* not a symlink */
265 goto out;
266
267 rc = parse_mf_symlink(buf, bytes_read, &link_len, NULL);
268 if (rc == -EINVAL) {
269 /* it's not a symlink */
270 rc = 0;
271 goto out;
272 }
273
274 if (rc != 0)
275 goto out;
276
277 /* it is a symlink */
278 fattr->cf_eof = link_len;
279 fattr->cf_mode &= ~S_IFMT;
280 fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
281 fattr->cf_dtype = DT_LNK;
282out:
283 kfree(buf);
284 return rc;
285}
286
287/*
288 * SMB 1.0 Protocol specific functions
289 */
290
291int
292cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
293 struct cifs_sb_info *cifs_sb, const unsigned char *path,
294 char *pbuf, unsigned int *pbytes_read)
295{
296 int rc;
297 int oplock = 0;
298 struct cifs_fid fid;
299 struct cifs_open_parms oparms;
300 struct cifs_io_parms io_parms = {0};
301 int buf_type = CIFS_NO_BUFFER;
302 FILE_ALL_INFO file_info;
303
304 oparms.tcon = tcon;
305 oparms.cifs_sb = cifs_sb;
306 oparms.desired_access = GENERIC_READ;
307 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
308 oparms.disposition = FILE_OPEN;
309 oparms.path = path;
310 oparms.fid = &fid;
311 oparms.reconnect = false;
312
313 rc = CIFS_open(xid, &oparms, &oplock, &file_info);
314 if (rc)
315 return rc;
316
317 if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
318 rc = -ENOENT;
319 /* it's not a symlink */
320 goto out;
321 }
322
323 io_parms.netfid = fid.netfid;
324 io_parms.pid = current->tgid;
325 io_parms.tcon = tcon;
326 io_parms.offset = 0;
327 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
328
329 rc = CIFSSMBRead(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
330out:
331 CIFSSMBClose(xid, tcon, fid.netfid);
332 return rc;
333}
334
335int
336cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
337 struct cifs_sb_info *cifs_sb, const unsigned char *path,
338 char *pbuf, unsigned int *pbytes_written)
339{
340 int rc;
341 int oplock = 0;
342 struct cifs_fid fid;
343 struct cifs_open_parms oparms;
344 struct cifs_io_parms io_parms = {0};
345
346 oparms.tcon = tcon;
347 oparms.cifs_sb = cifs_sb;
348 oparms.desired_access = GENERIC_WRITE;
349 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
350 oparms.disposition = FILE_CREATE;
351 oparms.path = path;
352 oparms.fid = &fid;
353 oparms.reconnect = false;
354
355 rc = CIFS_open(xid, &oparms, &oplock, NULL);
356 if (rc)
357 return rc;
358
359 io_parms.netfid = fid.netfid;
360 io_parms.pid = current->tgid;
361 io_parms.tcon = tcon;
362 io_parms.offset = 0;
363 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
364
365 rc = CIFSSMBWrite(xid, &io_parms, pbytes_written, pbuf);
366 CIFSSMBClose(xid, tcon, fid.netfid);
367 return rc;
368}
369
370/*
371 * SMB 2.1/SMB3 Protocol specific functions
372 */
373int
374smb3_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
375 struct cifs_sb_info *cifs_sb, const unsigned char *path,
376 char *pbuf, unsigned int *pbytes_read)
377{
378 int rc;
379 struct cifs_fid fid;
380 struct cifs_open_parms oparms;
381 struct cifs_io_parms io_parms = {0};
382 int buf_type = CIFS_NO_BUFFER;
383 __le16 *utf16_path;
384 __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
385 struct smb2_file_all_info *pfile_info = NULL;
386
387 oparms.tcon = tcon;
388 oparms.cifs_sb = cifs_sb;
389 oparms.desired_access = GENERIC_READ;
390 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
391 oparms.disposition = FILE_OPEN;
392 oparms.fid = &fid;
393 oparms.reconnect = false;
394
395 utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
396 if (utf16_path == NULL)
397 return -ENOMEM;
398
399 pfile_info = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
400 GFP_KERNEL);
401
402 if (pfile_info == NULL) {
403 kfree(utf16_path);
404 return -ENOMEM;
405 }
406
407 rc = SMB2_open(xid, &oparms, utf16_path, &oplock, pfile_info, NULL,
408 NULL, NULL);
409 if (rc)
410 goto qmf_out_open_fail;
411
412 if (pfile_info->EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
413 /* it's not a symlink */
414 rc = -ENOENT; /* Is there a better rc to return? */
415 goto qmf_out;
416 }
417
418 io_parms.netfid = fid.netfid;
419 io_parms.pid = current->tgid;
420 io_parms.tcon = tcon;
421 io_parms.offset = 0;
422 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
423 io_parms.persistent_fid = fid.persistent_fid;
424 io_parms.volatile_fid = fid.volatile_fid;
425 rc = SMB2_read(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
426qmf_out:
427 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
428qmf_out_open_fail:
429 kfree(utf16_path);
430 kfree(pfile_info);
431 return rc;
432}
433
434int
435smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
436 struct cifs_sb_info *cifs_sb, const unsigned char *path,
437 char *pbuf, unsigned int *pbytes_written)
438{
439 int rc;
440 struct cifs_fid fid;
441 struct cifs_open_parms oparms;
442 struct cifs_io_parms io_parms = {0};
443 __le16 *utf16_path;
444 __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
445 struct kvec iov[2];
446
447 cifs_dbg(FYI, "%s: path: %s\n", __func__, path);
448
449 utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
450 if (!utf16_path)
451 return -ENOMEM;
452
453 oparms.tcon = tcon;
454 oparms.cifs_sb = cifs_sb;
455 oparms.desired_access = GENERIC_WRITE;
456 oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR);
457 oparms.disposition = FILE_CREATE;
458 oparms.fid = &fid;
459 oparms.reconnect = false;
460
461 rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
462 NULL, NULL);
463 if (rc) {
464 kfree(utf16_path);
465 return rc;
466 }
467
468 io_parms.netfid = fid.netfid;
469 io_parms.pid = current->tgid;
470 io_parms.tcon = tcon;
471 io_parms.offset = 0;
472 io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
473 io_parms.persistent_fid = fid.persistent_fid;
474 io_parms.volatile_fid = fid.volatile_fid;
475
476 /* iov[0] is reserved for smb header */
477 iov[1].iov_base = pbuf;
478 iov[1].iov_len = CIFS_MF_SYMLINK_FILE_SIZE;
479
480 rc = SMB2_write(xid, &io_parms, pbytes_written, iov, 1);
481
482 /* Make sure we wrote all of the symlink data */
483 if ((rc == 0) && (*pbytes_written != CIFS_MF_SYMLINK_FILE_SIZE))
484 rc = -EIO;
485
486 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
487
488 kfree(utf16_path);
489 return rc;
490}
491
492/*
493 * M-F Symlink Functions - End
494 */
495
496int
497cifs_hardlink(struct dentry *old_file, struct inode *inode,
498 struct dentry *direntry)
499{
500 int rc = -EACCES;
501 unsigned int xid;
502 const char *from_name, *to_name;
503 void *page1, *page2;
504 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
505 struct tcon_link *tlink;
506 struct cifs_tcon *tcon;
507 struct TCP_Server_Info *server;
508 struct cifsInodeInfo *cifsInode;
509
510 if (unlikely(cifs_forced_shutdown(cifs_sb)))
511 return -EIO;
512
513 tlink = cifs_sb_tlink(cifs_sb);
514 if (IS_ERR(tlink))
515 return PTR_ERR(tlink);
516 tcon = tlink_tcon(tlink);
517
518 xid = get_xid();
519 page1 = alloc_dentry_path();
520 page2 = alloc_dentry_path();
521
522 from_name = build_path_from_dentry(old_file, page1);
523 if (IS_ERR(from_name)) {
524 rc = PTR_ERR(from_name);
525 goto cifs_hl_exit;
526 }
527 to_name = build_path_from_dentry(direntry, page2);
528 if (IS_ERR(to_name)) {
529 rc = PTR_ERR(to_name);
530 goto cifs_hl_exit;
531 }
532
533 if (tcon->unix_ext)
534 rc = CIFSUnixCreateHardLink(xid, tcon, from_name, to_name,
535 cifs_sb->local_nls,
536 cifs_remap(cifs_sb));
537 else {
538 server = tcon->ses->server;
539 if (!server->ops->create_hardlink) {
540 rc = -ENOSYS;
541 goto cifs_hl_exit;
542 }
543 rc = server->ops->create_hardlink(xid, tcon, from_name, to_name,
544 cifs_sb);
545 if ((rc == -EIO) || (rc == -EINVAL))
546 rc = -EOPNOTSUPP;
547 }
548
549 d_drop(direntry); /* force new lookup from server of target */
550
551 /*
552 * if source file is cached (oplocked) revalidate will not go to server
553 * until the file is closed or oplock broken so update nlinks locally
554 */
555 if (d_really_is_positive(old_file)) {
556 cifsInode = CIFS_I(d_inode(old_file));
557 if (rc == 0) {
558 spin_lock(&d_inode(old_file)->i_lock);
559 inc_nlink(d_inode(old_file));
560 spin_unlock(&d_inode(old_file)->i_lock);
561
562 /*
563 * parent dir timestamps will update from srv within a
564 * second, would it really be worth it to set the parent
565 * dir cifs inode time to zero to force revalidate
566 * (faster) for it too?
567 */
568 }
569 /*
570 * if not oplocked will force revalidate to get info on source
571 * file from srv. Note Samba server prior to 4.2 has bug -
572 * not updating src file ctime on hardlinks but Windows servers
573 * handle it properly
574 */
575 cifsInode->time = 0;
576
577 /*
578 * Will update parent dir timestamps from srv within a second.
579 * Would it really be worth it to set the parent dir (cifs
580 * inode) time field to zero to force revalidate on parent
581 * directory faster ie
582 *
583 * CIFS_I(inode)->time = 0;
584 */
585 }
586
587cifs_hl_exit:
588 free_dentry_path(page1);
589 free_dentry_path(page2);
590 free_xid(xid);
591 cifs_put_tlink(tlink);
592 return rc;
593}
594
595const char *
596cifs_get_link(struct dentry *direntry, struct inode *inode,
597 struct delayed_call *done)
598{
599 int rc = -ENOMEM;
600 unsigned int xid;
601 const char *full_path;
602 void *page;
603 char *target_path = NULL;
604 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
605 struct tcon_link *tlink = NULL;
606 struct cifs_tcon *tcon;
607 struct TCP_Server_Info *server;
608
609 if (!direntry)
610 return ERR_PTR(-ECHILD);
611
612 xid = get_xid();
613
614 tlink = cifs_sb_tlink(cifs_sb);
615 if (IS_ERR(tlink)) {
616 free_xid(xid);
617 return ERR_CAST(tlink);
618 }
619 tcon = tlink_tcon(tlink);
620 server = tcon->ses->server;
621
622 page = alloc_dentry_path();
623 full_path = build_path_from_dentry(direntry, page);
624 if (IS_ERR(full_path)) {
625 free_xid(xid);
626 cifs_put_tlink(tlink);
627 free_dentry_path(page);
628 return ERR_CAST(full_path);
629 }
630
631 cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", full_path, inode);
632
633 rc = -EACCES;
634 /*
635 * First try Minshall+French Symlinks, if configured
636 * and fallback to UNIX Extensions Symlinks.
637 */
638 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
639 rc = query_mf_symlink(xid, tcon, cifs_sb, full_path,
640 &target_path);
641
642 if (rc != 0 && server->ops->query_symlink) {
643 struct cifsInodeInfo *cifsi = CIFS_I(inode);
644 bool reparse_point = false;
645
646 if (cifsi->cifsAttrs & ATTR_REPARSE)
647 reparse_point = true;
648
649 rc = server->ops->query_symlink(xid, tcon, cifs_sb, full_path,
650 &target_path, reparse_point);
651 }
652
653 free_dentry_path(page);
654 free_xid(xid);
655 cifs_put_tlink(tlink);
656 if (rc != 0) {
657 kfree(target_path);
658 return ERR_PTR(rc);
659 }
660 set_delayed_call(done, kfree_link, target_path);
661 return target_path;
662}
663
664int
665cifs_symlink(struct user_namespace *mnt_userns, struct inode *inode,
666 struct dentry *direntry, const char *symname)
667{
668 int rc = -EOPNOTSUPP;
669 unsigned int xid;
670 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
671 struct tcon_link *tlink;
672 struct cifs_tcon *pTcon;
673 const char *full_path;
674 void *page;
675 struct inode *newinode = NULL;
676
677 if (unlikely(cifs_forced_shutdown(cifs_sb)))
678 return -EIO;
679
680 page = alloc_dentry_path();
681 if (!page)
682 return -ENOMEM;
683
684 xid = get_xid();
685
686 tlink = cifs_sb_tlink(cifs_sb);
687 if (IS_ERR(tlink)) {
688 rc = PTR_ERR(tlink);
689 goto symlink_exit;
690 }
691 pTcon = tlink_tcon(tlink);
692
693 full_path = build_path_from_dentry(direntry, page);
694 if (IS_ERR(full_path)) {
695 rc = PTR_ERR(full_path);
696 goto symlink_exit;
697 }
698
699 cifs_dbg(FYI, "Full path: %s\n", full_path);
700 cifs_dbg(FYI, "symname is %s\n", symname);
701
702 /* BB what if DFS and this volume is on different share? BB */
703 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
704 rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname);
705 else if (pTcon->unix_ext)
706 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
707 cifs_sb->local_nls,
708 cifs_remap(cifs_sb));
709 /* else
710 rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
711 cifs_sb_target->local_nls); */
712
713 if (rc == 0) {
714 if (pTcon->posix_extensions)
715 rc = smb311_posix_get_inode_info(&newinode, full_path, inode->i_sb, xid);
716 else if (pTcon->unix_ext)
717 rc = cifs_get_inode_info_unix(&newinode, full_path,
718 inode->i_sb, xid);
719 else
720 rc = cifs_get_inode_info(&newinode, full_path, NULL,
721 inode->i_sb, xid, NULL);
722
723 if (rc != 0) {
724 cifs_dbg(FYI, "Create symlink ok, getinodeinfo fail rc = %d\n",
725 rc);
726 } else {
727 d_instantiate(direntry, newinode);
728 }
729 }
730symlink_exit:
731 free_dentry_path(page);
732 cifs_put_tlink(tlink);
733 free_xid(xid);
734 return rc;
735}