fs/cifs/link.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2008
   5  *   Author(s): Steve French ([email protected])
   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
  37 static int
  38 symlink_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
  61 symlink_hash_err:
  62         cifs_free_hash(&md5);
  63         return rc;
  64 }
  65
  66 static int
  67 parse_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
 113 static int
 114 format_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
 157 bool
 158 couldbe_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
 171 static int
 172 create_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;
 199 out:
 200         kfree(buf);
 201         return rc;
 202 }
 203
 204 int
 205 check_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;
 251 out:
 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
 261 int
 262 cifs_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 = (struct cifs_open_parms) {
 275                 .tcon = tcon,
 276                 .cifs_sb = cifs_sb,
 277                 .desired_access = GENERIC_READ,
 278                 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
 279                 .disposition = FILE_OPEN,
 280                 .path = path,
 281                 .fid = &fid,
 282         };
 283
 284         rc = CIFS_open(xid, &oparms, &oplock, &file_info);
 285         if (rc)
 286                 return rc;
 287
 288         if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
 289                 rc = -ENOENT;
 290                 /* it's not a symlink */
 291                 goto out;
 292         }
 293
 294         io_parms.netfid = fid.netfid;
 295         io_parms.pid = current->tgid;
 296         io_parms.tcon = tcon;
 297         io_parms.offset = 0;
 298         io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
 299
 300         rc = CIFSSMBRead(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
 301 out:
 302         CIFSSMBClose(xid, tcon, fid.netfid);
 303         return rc;
 304 }
 305
 306 int
 307 cifs_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
 308                        struct cifs_sb_info *cifs_sb, const unsigned char *path,
 309                        char *pbuf, unsigned int *pbytes_written)
 310 {
 311         int rc;
 312         int oplock = 0;
 313         struct cifs_fid fid;
 314         struct cifs_open_parms oparms;
 315         struct cifs_io_parms io_parms = {0};
 316
 317         oparms = (struct cifs_open_parms) {
 318                 .tcon = tcon,
 319                 .cifs_sb = cifs_sb,
 320                 .desired_access = GENERIC_WRITE,
 321                 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
 322                 .disposition = FILE_CREATE,
 323                 .path = path,
 324                 .fid = &fid,
 325         };
 326
 327         rc = CIFS_open(xid, &oparms, &oplock, NULL);
 328         if (rc)
 329                 return rc;
 330
 331         io_parms.netfid = fid.netfid;
 332         io_parms.pid = current->tgid;
 333         io_parms.tcon = tcon;
 334         io_parms.offset = 0;
 335         io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
 336
 337         rc = CIFSSMBWrite(xid, &io_parms, pbytes_written, pbuf);
 338         CIFSSMBClose(xid, tcon, fid.netfid);
 339         return rc;
 340 }
 341 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
 342
 343 /*
 344  * SMB 2.1/SMB3 Protocol specific functions
 345  */
 346 int
 347 smb3_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
 348                       struct cifs_sb_info *cifs_sb, const unsigned char *path,
 349                       char *pbuf, unsigned int *pbytes_read)
 350 {
 351         int rc;
 352         struct cifs_fid fid;
 353         struct cifs_open_parms oparms;
 354         struct cifs_io_parms io_parms = {0};
 355         int buf_type = CIFS_NO_BUFFER;
 356         __le16 *utf16_path;
 357         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 358         struct smb2_file_all_info *pfile_info = NULL;
 359
 360         oparms = (struct cifs_open_parms) {
 361                 .tcon = tcon,
 362                 .cifs_sb = cifs_sb,
 363                 .desired_access = GENERIC_READ,
 364                 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
 365                 .disposition = FILE_OPEN,
 366                 .fid = &fid,
 367         };
 368
 369         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 370         if (utf16_path == NULL)
 371                 return -ENOMEM;
 372
 373         pfile_info = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 374                              GFP_KERNEL);
 375
 376         if (pfile_info == NULL) {
 377                 kfree(utf16_path);
 378                 return  -ENOMEM;
 379         }
 380
 381         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, pfile_info, NULL,
 382                        NULL, NULL);
 383         if (rc)
 384                 goto qmf_out_open_fail;
 385
 386         if (pfile_info->EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
 387                 /* it's not a symlink */
 388                 rc = -ENOENT; /* Is there a better rc to return? */
 389                 goto qmf_out;
 390         }
 391
 392         io_parms.netfid = fid.netfid;
 393         io_parms.pid = current->tgid;
 394         io_parms.tcon = tcon;
 395         io_parms.offset = 0;
 396         io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
 397         io_parms.persistent_fid = fid.persistent_fid;
 398         io_parms.volatile_fid = fid.volatile_fid;
 399         rc = SMB2_read(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
 400 qmf_out:
 401         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 402 qmf_out_open_fail:
 403         kfree(utf16_path);
 404         kfree(pfile_info);
 405         return rc;
 406 }
 407
 408 int
 409 smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
 410                        struct cifs_sb_info *cifs_sb, const unsigned char *path,
 411                        char *pbuf, unsigned int *pbytes_written)
 412 {
 413         int rc;
 414         struct cifs_fid fid;
 415         struct cifs_open_parms oparms;
 416         struct cifs_io_parms io_parms = {0};
 417         __le16 *utf16_path;
 418         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 419         struct kvec iov[2];
 420
 421         cifs_dbg(FYI, "%s: path: %s\n", __func__, path);
 422
 423         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 424         if (!utf16_path)
 425                 return -ENOMEM;
 426
 427         oparms = (struct cifs_open_parms) {
 428                 .tcon = tcon,
 429                 .cifs_sb = cifs_sb,
 430                 .desired_access = GENERIC_WRITE,
 431                 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),
 432                 .disposition = FILE_CREATE,
 433                 .fid = &fid,
 434                 .mode = 0644,
 435         };
 436
 437         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
 438                        NULL, NULL);
 439         if (rc) {
 440                 kfree(utf16_path);
 441                 return rc;
 442         }
 443
 444         io_parms.netfid = fid.netfid;
 445         io_parms.pid = current->tgid;
 446         io_parms.tcon = tcon;
 447         io_parms.offset = 0;
 448         io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
 449         io_parms.persistent_fid = fid.persistent_fid;
 450         io_parms.volatile_fid = fid.volatile_fid;
 451
 452         /* iov[0] is reserved for smb header */
 453         iov[1].iov_base = pbuf;
 454         iov[1].iov_len = CIFS_MF_SYMLINK_FILE_SIZE;
 455
 456         rc = SMB2_write(xid, &io_parms, pbytes_written, iov, 1);
 457
 458         /* Make sure we wrote all of the symlink data */
 459         if ((rc == 0) && (*pbytes_written != CIFS_MF_SYMLINK_FILE_SIZE))
 460                 rc = -EIO;
 461
 462         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 463
 464         kfree(utf16_path);
 465         return rc;
 466 }
 467
 468 /*
 469  * M-F Symlink Functions - End
 470  */
 471
 472 int
 473 cifs_hardlink(struct dentry *old_file, struct inode *inode,
 474               struct dentry *direntry)
 475 {
 476         int rc = -EACCES;
 477         unsigned int xid;
 478         const char *from_name, *to_name;
 479         void *page1, *page2;
 480         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 481         struct tcon_link *tlink;
 482         struct cifs_tcon *tcon;
 483         struct TCP_Server_Info *server;
 484         struct cifsInodeInfo *cifsInode;
 485
 486         if (unlikely(cifs_forced_shutdown(cifs_sb)))
 487                 return -EIO;
 488
 489         tlink = cifs_sb_tlink(cifs_sb);
 490         if (IS_ERR(tlink))
 491                 return PTR_ERR(tlink);
 492         tcon = tlink_tcon(tlink);
 493
 494         xid = get_xid();
 495         page1 = alloc_dentry_path();
 496         page2 = alloc_dentry_path();
 497
 498         from_name = build_path_from_dentry(old_file, page1);
 499         if (IS_ERR(from_name)) {
 500                 rc = PTR_ERR(from_name);
 501                 goto cifs_hl_exit;
 502         }
 503         to_name = build_path_from_dentry(direntry, page2);
 504         if (IS_ERR(to_name)) {
 505                 rc = PTR_ERR(to_name);
 506                 goto cifs_hl_exit;
 507         }
 508
 509 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
 510         if (tcon->unix_ext)
 511                 rc = CIFSUnixCreateHardLink(xid, tcon, from_name, to_name,
 512                                             cifs_sb->local_nls,
 513                                             cifs_remap(cifs_sb));
 514         else {
 515 #else
 516         {
 517 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
 518                 server = tcon->ses->server;
 519                 if (!server->ops->create_hardlink) {
 520                         rc = -ENOSYS;
 521                         goto cifs_hl_exit;
 522                 }
 523                 rc = server->ops->create_hardlink(xid, tcon, from_name, to_name,
 524                                                   cifs_sb);
 525                 if ((rc == -EIO) || (rc == -EINVAL))
 526                         rc = -EOPNOTSUPP;
 527         }
 528
 529         d_drop(direntry);       /* force new lookup from server of target */
 530
 531         /*
 532          * if source file is cached (oplocked) revalidate will not go to server
 533          * until the file is closed or oplock broken so update nlinks locally
 534          */
 535         if (d_really_is_positive(old_file)) {
 536                 cifsInode = CIFS_I(d_inode(old_file));
 537                 if (rc == 0) {
 538                         spin_lock(&d_inode(old_file)->i_lock);
 539                         inc_nlink(d_inode(old_file));
 540                         spin_unlock(&d_inode(old_file)->i_lock);
 541
 542                         /*
 543                          * parent dir timestamps will update from srv within a
 544                          * second, would it really be worth it to set the parent
 545                          * dir cifs inode time to zero to force revalidate
 546                          * (faster) for it too?
 547                          */
 548                 }
 549                 /*
 550                  * if not oplocked will force revalidate to get info on source
 551                  * file from srv.  Note Samba server prior to 4.2 has bug -
 552                  * not updating src file ctime on hardlinks but Windows servers
 553                  * handle it properly
 554                  */
 555                 cifsInode->time = 0;
 556
 557                 /*
 558                  * Will update parent dir timestamps from srv within a second.
 559                  * Would it really be worth it to set the parent dir (cifs
 560                  * inode) time field to zero to force revalidate on parent
 561                  * directory faster ie
 562                  *
 563                  * CIFS_I(inode)->time = 0;
 564                  */
 565         }
 566
 567 cifs_hl_exit:
 568         free_dentry_path(page1);
 569         free_dentry_path(page2);
 570         free_xid(xid);
 571         cifs_put_tlink(tlink);
 572         return rc;
 573 }
 574
 575 int
 576 cifs_symlink(struct mnt_idmap *idmap, struct inode *inode,
 577              struct dentry *direntry, const char *symname)
 578 {
 579         int rc = -EOPNOTSUPP;
 580         unsigned int xid;
 581         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 582         struct tcon_link *tlink;
 583         struct cifs_tcon *pTcon;
 584         const char *full_path;
 585         void *page;
 586         struct inode *newinode = NULL;
 587
 588         if (unlikely(cifs_forced_shutdown(cifs_sb)))
 589                 return -EIO;
 590
 591         page = alloc_dentry_path();
 592         if (!page)
 593                 return -ENOMEM;
 594
 595         xid = get_xid();
 596
 597         tlink = cifs_sb_tlink(cifs_sb);
 598         if (IS_ERR(tlink)) {
 599                 rc = PTR_ERR(tlink);
 600                 goto symlink_exit;
 601         }
 602         pTcon = tlink_tcon(tlink);
 603
 604         full_path = build_path_from_dentry(direntry, page);
 605         if (IS_ERR(full_path)) {
 606                 rc = PTR_ERR(full_path);
 607                 goto symlink_exit;
 608         }
 609
 610         cifs_dbg(FYI, "Full path: %s\n", full_path);
 611         cifs_dbg(FYI, "symname is %s\n", symname);
 612
 613         /* BB what if DFS and this volume is on different share? BB */
 614         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 615                 rc = create_mf_symlink(xid, pTcon, cifs_sb, full_path, symname);
 616 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
 617         else if (pTcon->unix_ext)
 618                 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
 619                                            cifs_sb->local_nls,
 620                                            cifs_remap(cifs_sb));
 621 #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
 622         /* else
 623            rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
 624                                         cifs_sb_target->local_nls); */
 625
 626         if (rc == 0) {
 627                 if (pTcon->posix_extensions)
 628                         rc = smb311_posix_get_inode_info(&newinode, full_path, inode->i_sb, xid);
 629                 else if (pTcon->unix_ext)
 630                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 631                                                       inode->i_sb, xid);
 632                 else
 633                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 634                                                  inode->i_sb, xid, NULL);
 635
 636                 if (rc != 0) {
 637                         cifs_dbg(FYI, "Create symlink ok, getinodeinfo fail rc = %d\n",
 638                                  rc);
 639                 } else {
 640                         d_instantiate(direntry, newinode);
 641                 }
 642         }
 643 symlink_exit:
 644         free_dentry_path(page);
 645         cifs_put_tlink(tlink);
 646         free_xid(xid);
 647         return rc;
 648 }