fs/cifs/link.c

   1 /*
   2  *   fs/cifs/link.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2008
   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>
  23 #include <linux/slab.h>
  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"
  31
  32 #define CIFS_MF_SYMLINK_LEN_OFFSET (4+1)
  33 #define CIFS_MF_SYMLINK_MD5_OFFSET (CIFS_MF_SYMLINK_LEN_OFFSET+(4+1))
  34 #define CIFS_MF_SYMLINK_LINK_OFFSET (CIFS_MF_SYMLINK_MD5_OFFSET+(32+1))
  35 #define CIFS_MF_SYMLINK_LINK_MAXLEN (1024)
  36 #define CIFS_MF_SYMLINK_FILE_SIZE \
  37         (CIFS_MF_SYMLINK_LINK_OFFSET + CIFS_MF_SYMLINK_LINK_MAXLEN)
  38
  39 #define CIFS_MF_SYMLINK_LEN_FORMAT "XSym\n%04u\n"
  40 #define CIFS_MF_SYMLINK_MD5_FORMAT \
  41         "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n"
  42 #define CIFS_MF_SYMLINK_MD5_ARGS(md5_hash) \
  43         md5_hash[0],  md5_hash[1],  md5_hash[2],  md5_hash[3], \
  44         md5_hash[4],  md5_hash[5],  md5_hash[6],  md5_hash[7], \
  45         md5_hash[8],  md5_hash[9],  md5_hash[10], md5_hash[11],\
  46         md5_hash[12], md5_hash[13], md5_hash[14], md5_hash[15]
  47
  48 static int
  49 symlink_hash(unsigned int link_len, const char *link_str, u8 *md5_hash)
  50 {
  51         int rc;
  52         unsigned int size;
  53         struct crypto_shash *md5;
  54         struct sdesc *sdescmd5;
  55
  56         md5 = crypto_alloc_shash("md5", 0, 0);
  57         if (IS_ERR(md5)) {
  58                 rc = PTR_ERR(md5);
  59                 cifs_dbg(VFS, "%s: Crypto md5 allocation error %d\n",
  60                          __func__, rc);
  61                 return rc;
  62         }
  63         size = sizeof(struct shash_desc) + crypto_shash_descsize(md5);
  64         sdescmd5 = kmalloc(size, GFP_KERNEL);
  65         if (!sdescmd5) {
  66                 rc = -ENOMEM;
  67                 goto symlink_hash_err;
  68         }
  69         sdescmd5->shash.tfm = md5;
  70         sdescmd5->shash.flags = 0x0;
  71
  72         rc = crypto_shash_init(&sdescmd5->shash);
  73         if (rc) {
  74                 cifs_dbg(VFS, "%s: Could not init md5 shash\n", __func__);
  75                 goto symlink_hash_err;
  76         }
  77         rc = crypto_shash_update(&sdescmd5->shash, link_str, link_len);
  78         if (rc) {
  79                 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__);
  80                 goto symlink_hash_err;
  81         }
  82         rc = crypto_shash_final(&sdescmd5->shash, md5_hash);
  83         if (rc)
  84                 cifs_dbg(VFS, "%s: Could not generate md5 hash\n", __func__);
  85
  86 symlink_hash_err:
  87         crypto_free_shash(md5);
  88         kfree(sdescmd5);
  89
  90         return rc;
  91 }
  92
  93 static int
  94 CIFSParseMFSymlink(const u8 *buf,
  95                    unsigned int buf_len,
  96                    unsigned int *_link_len,
  97                    char **_link_str)
  98 {
  99         int rc;
 100         unsigned int link_len;
 101         const char *md5_str1;
 102         const char *link_str;
 103         u8 md5_hash[16];
 104         char md5_str2[34];
 105
 106         if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
 107                 return -EINVAL;
 108
 109         md5_str1 = (const char *)&buf[CIFS_MF_SYMLINK_MD5_OFFSET];
 110         link_str = (const char *)&buf[CIFS_MF_SYMLINK_LINK_OFFSET];
 111
 112         rc = sscanf(buf, CIFS_MF_SYMLINK_LEN_FORMAT, &link_len);
 113         if (rc != 1)
 114                 return -EINVAL;
 115
 116         rc = symlink_hash(link_len, link_str, md5_hash);
 117         if (rc) {
 118                 cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc);
 119                 return rc;
 120         }
 121
 122         snprintf(md5_str2, sizeof(md5_str2),
 123                  CIFS_MF_SYMLINK_MD5_FORMAT,
 124                  CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
 125
 126         if (strncmp(md5_str1, md5_str2, 17) != 0)
 127                 return -EINVAL;
 128
 129         if (_link_str) {
 130                 *_link_str = kstrndup(link_str, link_len, GFP_KERNEL);
 131                 if (!*_link_str)
 132                         return -ENOMEM;
 133         }
 134
 135         *_link_len = link_len;
 136         return 0;
 137 }
 138
 139 static int
 140 CIFSFormatMFSymlink(u8 *buf, unsigned int buf_len, const char *link_str)
 141 {
 142         int rc;
 143         unsigned int link_len;
 144         unsigned int ofs;
 145         u8 md5_hash[16];
 146
 147         if (buf_len != CIFS_MF_SYMLINK_FILE_SIZE)
 148                 return -EINVAL;
 149
 150         link_len = strlen(link_str);
 151
 152         if (link_len > CIFS_MF_SYMLINK_LINK_MAXLEN)
 153                 return -ENAMETOOLONG;
 154
 155         rc = symlink_hash(link_len, link_str, md5_hash);
 156         if (rc) {
 157                 cifs_dbg(FYI, "%s: MD5 hash failure: %d\n", __func__, rc);
 158                 return rc;
 159         }
 160
 161         snprintf(buf, buf_len,
 162                  CIFS_MF_SYMLINK_LEN_FORMAT CIFS_MF_SYMLINK_MD5_FORMAT,
 163                  link_len,
 164                  CIFS_MF_SYMLINK_MD5_ARGS(md5_hash));
 165
 166         ofs = CIFS_MF_SYMLINK_LINK_OFFSET;
 167         memcpy(buf + ofs, link_str, link_len);
 168
 169         ofs += link_len;
 170         if (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
 171                 buf[ofs] = '\n';
 172                 ofs++;
 173         }
 174
 175         while (ofs < CIFS_MF_SYMLINK_FILE_SIZE) {
 176                 buf[ofs] = ' ';
 177                 ofs++;
 178         }
 179
 180         return 0;
 181 }
 182
 183 static int
 184 CIFSCreateMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
 185                     const char *fromName, const char *toName,
 186                     struct cifs_sb_info *cifs_sb)
 187 {
 188         int rc;
 189         int oplock = 0;
 190         int remap;
 191         int create_options = CREATE_NOT_DIR;
 192         __u16 netfid = 0;
 193         u8 *buf;
 194         unsigned int bytes_written = 0;
 195         struct cifs_io_parms io_parms;
 196         struct nls_table *nls_codepage;
 197
 198         nls_codepage = cifs_sb->local_nls;
 199         remap = cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR;
 200
 201         buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
 202         if (!buf)
 203                 return -ENOMEM;
 204
 205         rc = CIFSFormatMFSymlink(buf, CIFS_MF_SYMLINK_FILE_SIZE, toName);
 206         if (rc != 0) {
 207                 kfree(buf);
 208                 return rc;
 209         }
 210
 211         if (backup_cred(cifs_sb))
 212                 create_options |= CREATE_OPEN_BACKUP_INTENT;
 213
 214         rc = CIFSSMBOpen(xid, tcon, fromName, FILE_CREATE, GENERIC_WRITE,
 215                          create_options, &netfid, &oplock, NULL,
 216                          nls_codepage, remap);
 217         if (rc != 0) {
 218                 kfree(buf);
 219                 return rc;
 220         }
 221
 222         io_parms.netfid = netfid;
 223         io_parms.pid = current->tgid;
 224         io_parms.tcon = tcon;
 225         io_parms.offset = 0;
 226         io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
 227
 228         rc = CIFSSMBWrite(xid, &io_parms, &bytes_written, buf, NULL, 0);
 229         CIFSSMBClose(xid, tcon, netfid);
 230         kfree(buf);
 231         if (rc != 0)
 232                 return rc;
 233
 234         if (bytes_written != CIFS_MF_SYMLINK_FILE_SIZE)
 235                 return -EIO;
 236
 237         return 0;
 238 }
 239
 240 static int
 241 CIFSQueryMFSymLink(const unsigned int xid, struct cifs_tcon *tcon,
 242                    const unsigned char *searchName, char **symlinkinfo,
 243                    const struct nls_table *nls_codepage, int remap)
 244 {
 245         int rc;
 246         int oplock = 0;
 247         __u16 netfid = 0;
 248         u8 *buf;
 249         char *pbuf;
 250         unsigned int bytes_read = 0;
 251         int buf_type = CIFS_NO_BUFFER;
 252         unsigned int link_len = 0;
 253         struct cifs_io_parms io_parms;
 254         FILE_ALL_INFO file_info;
 255
 256         rc = CIFSSMBOpen(xid, tcon, searchName, FILE_OPEN, GENERIC_READ,
 257                          CREATE_NOT_DIR, &netfid, &oplock, &file_info,
 258                          nls_codepage, remap);
 259         if (rc != 0)
 260                 return rc;
 261
 262         if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
 263                 CIFSSMBClose(xid, tcon, netfid);
 264                 /* it's not a symlink */
 265                 return -EINVAL;
 266         }
 267
 268         buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
 269         if (!buf)
 270                 return -ENOMEM;
 271         pbuf = buf;
 272         io_parms.netfid = netfid;
 273         io_parms.pid = current->tgid;
 274         io_parms.tcon = tcon;
 275         io_parms.offset = 0;
 276         io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
 277
 278         rc = CIFSSMBRead(xid, &io_parms, &bytes_read, &pbuf, &buf_type);
 279         CIFSSMBClose(xid, tcon, netfid);
 280         if (rc != 0) {
 281                 kfree(buf);
 282                 return rc;
 283         }
 284
 285         rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, symlinkinfo);
 286         kfree(buf);
 287         if (rc != 0)
 288                 return rc;
 289
 290         return 0;
 291 }
 292
 293 bool
 294 CIFSCouldBeMFSymlink(const struct cifs_fattr *fattr)
 295 {
 296         if (!(fattr->cf_mode & S_IFREG))
 297                 /* it's not a symlink */
 298                 return false;
 299
 300         if (fattr->cf_eof != CIFS_MF_SYMLINK_FILE_SIZE)
 301                 /* it's not a symlink */
 302                 return false;
 303
 304         return true;
 305 }
 306
 307 int
 308 open_query_close_cifs_symlink(const unsigned char *path, char *pbuf,
 309                         unsigned int *pbytes_read, struct cifs_sb_info *cifs_sb,
 310                         unsigned int xid)
 311 {
 312         int rc;
 313         int oplock = 0;
 314         __u16 netfid = 0;
 315         struct tcon_link *tlink;
 316         struct cifs_tcon *ptcon;
 317         struct cifs_io_parms io_parms;
 318         int buf_type = CIFS_NO_BUFFER;
 319         FILE_ALL_INFO file_info;
 320
 321         tlink = cifs_sb_tlink(cifs_sb);
 322         if (IS_ERR(tlink))
 323                 return PTR_ERR(tlink);
 324         ptcon = tlink_tcon(tlink);
 325
 326         rc = CIFSSMBOpen(xid, ptcon, path, FILE_OPEN, GENERIC_READ,
 327                          CREATE_NOT_DIR, &netfid, &oplock, &file_info,
 328                          cifs_sb->local_nls,
 329                          cifs_sb->mnt_cifs_flags &
 330                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 331         if (rc != 0) {
 332                 cifs_put_tlink(tlink);
 333                 return rc;
 334         }
 335
 336         if (file_info.EndOfFile != cpu_to_le64(CIFS_MF_SYMLINK_FILE_SIZE)) {
 337                 CIFSSMBClose(xid, ptcon, netfid);
 338                 cifs_put_tlink(tlink);
 339                 /* it's not a symlink */
 340                 return rc;
 341         }
 342
 343         io_parms.netfid = netfid;
 344         io_parms.pid = current->tgid;
 345         io_parms.tcon = ptcon;
 346         io_parms.offset = 0;
 347         io_parms.length = CIFS_MF_SYMLINK_FILE_SIZE;
 348
 349         rc = CIFSSMBRead(xid, &io_parms, pbytes_read, &pbuf, &buf_type);
 350         CIFSSMBClose(xid, ptcon, netfid);
 351         cifs_put_tlink(tlink);
 352         return rc;
 353 }
 354
 355
 356 int
 357 CIFSCheckMFSymlink(struct cifs_fattr *fattr,
 358                    const unsigned char *path,
 359                    struct cifs_sb_info *cifs_sb, unsigned int xid)
 360 {
 361         int rc = 0;
 362         u8 *buf = NULL;
 363         unsigned int link_len = 0;
 364         unsigned int bytes_read = 0;
 365         struct cifs_tcon *ptcon;
 366
 367         if (!CIFSCouldBeMFSymlink(fattr))
 368                 /* it's not a symlink */
 369                 return 0;
 370
 371         buf = kmalloc(CIFS_MF_SYMLINK_FILE_SIZE, GFP_KERNEL);
 372         if (!buf) {
 373                 rc = -ENOMEM;
 374                 goto out;
 375         }
 376
 377         ptcon = tlink_tcon(cifs_sb_tlink(cifs_sb));
 378         if ((ptcon->ses) && (ptcon->ses->server->ops->query_mf_symlink))
 379                 rc = ptcon->ses->server->ops->query_mf_symlink(path, buf,
 380                                                  &bytes_read, cifs_sb, xid);
 381         else
 382                 goto out;
 383
 384         if (rc != 0)
 385                 goto out;
 386
 387         if (bytes_read == 0) /* not a symlink */
 388                 goto out;
 389
 390         rc = CIFSParseMFSymlink(buf, bytes_read, &link_len, NULL);
 391         if (rc == -EINVAL) {
 392                 /* it's not a symlink */
 393                 rc = 0;
 394                 goto out;
 395         }
 396
 397         if (rc != 0)
 398                 goto out;
 399
 400         /* it is a symlink */
 401         fattr->cf_eof = link_len;
 402         fattr->cf_mode &= ~S_IFMT;
 403         fattr->cf_mode |= S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
 404         fattr->cf_dtype = DT_LNK;
 405 out:
 406         kfree(buf);
 407         return rc;
 408 }
 409
 410 int
 411 cifs_hardlink(struct dentry *old_file, struct inode *inode,
 412               struct dentry *direntry)
 413 {
 414         int rc = -EACCES;
 415         unsigned int xid;
 416         char *from_name = NULL;
 417         char *to_name = NULL;
 418         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 419         struct tcon_link *tlink;
 420         struct cifs_tcon *tcon;
 421         struct TCP_Server_Info *server;
 422         struct cifsInodeInfo *cifsInode;
 423
 424         tlink = cifs_sb_tlink(cifs_sb);
 425         if (IS_ERR(tlink))
 426                 return PTR_ERR(tlink);
 427         tcon = tlink_tcon(tlink);
 428
 429         xid = get_xid();
 430
 431         from_name = build_path_from_dentry(old_file);
 432         to_name = build_path_from_dentry(direntry);
 433         if ((from_name == NULL) || (to_name == NULL)) {
 434                 rc = -ENOMEM;
 435                 goto cifs_hl_exit;
 436         }
 437
 438         if (tcon->unix_ext)
 439                 rc = CIFSUnixCreateHardLink(xid, tcon, from_name, to_name,
 440                                             cifs_sb->local_nls,
 441                                             cifs_sb->mnt_cifs_flags &
 442                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 443         else {
 444                 server = tcon->ses->server;
 445                 if (!server->ops->create_hardlink)
 446                         return -ENOSYS;
 447                 rc = server->ops->create_hardlink(xid, tcon, from_name, to_name,
 448                                                   cifs_sb);
 449                 if ((rc == -EIO) || (rc == -EINVAL))
 450                         rc = -EOPNOTSUPP;
 451         }
 452
 453         d_drop(direntry);       /* force new lookup from server of target */
 454
 455         /*
 456          * if source file is cached (oplocked) revalidate will not go to server
 457          * until the file is closed or oplock broken so update nlinks locally
 458          */
 459         if (old_file->d_inode) {
 460                 cifsInode = CIFS_I(old_file->d_inode);
 461                 if (rc == 0) {
 462                         spin_lock(&old_file->d_inode->i_lock);
 463                         inc_nlink(old_file->d_inode);
 464                         spin_unlock(&old_file->d_inode->i_lock);
 465                         /*
 466                          * BB should we make this contingent on superblock flag
 467                          * NOATIME?
 468                          */
 469                         /* old_file->d_inode->i_ctime = CURRENT_TIME; */
 470                         /*
 471                          * parent dir timestamps will update from srv within a
 472                          * second, would it really be worth it to set the parent
 473                          * dir cifs inode time to zero to force revalidate
 474                          * (faster) for it too?
 475                          */
 476                 }
 477                 /*
 478                  * if not oplocked will force revalidate to get info on source
 479                  * file from srv
 480                  */
 481                 cifsInode->time = 0;
 482
 483                 /*
 484                  * Will update parent dir timestamps from srv within a second.
 485                  * Would it really be worth it to set the parent dir (cifs
 486                  * inode) time field to zero to force revalidate on parent
 487                  * directory faster ie
 488                  *
 489                  * CIFS_I(inode)->time = 0;
 490                  */
 491         }
 492
 493 cifs_hl_exit:
 494         kfree(from_name);
 495         kfree(to_name);
 496         free_xid(xid);
 497         cifs_put_tlink(tlink);
 498         return rc;
 499 }
 500
 501 void *
 502 cifs_follow_link(struct dentry *direntry, struct nameidata *nd)
 503 {
 504         struct inode *inode = direntry->d_inode;
 505         int rc = -ENOMEM;
 506         unsigned int xid;
 507         char *full_path = NULL;
 508         char *target_path = NULL;
 509         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 510         struct tcon_link *tlink = NULL;
 511         struct cifs_tcon *tcon;
 512         struct TCP_Server_Info *server;
 513
 514         xid = get_xid();
 515
 516         tlink = cifs_sb_tlink(cifs_sb);
 517         if (IS_ERR(tlink)) {
 518                 rc = PTR_ERR(tlink);
 519                 tlink = NULL;
 520                 goto out;
 521         }
 522         tcon = tlink_tcon(tlink);
 523         server = tcon->ses->server;
 524
 525         full_path = build_path_from_dentry(direntry);
 526         if (!full_path)
 527                 goto out;
 528
 529         cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", full_path, inode);
 530
 531         rc = -EACCES;
 532         /*
 533          * First try Minshall+French Symlinks, if configured
 534          * and fallback to UNIX Extensions Symlinks.
 535          */
 536         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 537                 rc = CIFSQueryMFSymLink(xid, tcon, full_path, &target_path,
 538                                         cifs_sb->local_nls,
 539                                         cifs_sb->mnt_cifs_flags &
 540                                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
 541
 542         if ((rc != 0) && cap_unix(tcon->ses))
 543                 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
 544                                              cifs_sb->local_nls);
 545         else if (rc != 0 && server->ops->query_symlink)
 546                 rc = server->ops->query_symlink(xid, tcon, full_path,
 547                                                 &target_path, cifs_sb);
 548
 549         kfree(full_path);
 550 out:
 551         if (rc != 0) {
 552                 kfree(target_path);
 553                 target_path = ERR_PTR(rc);
 554         }
 555
 556         free_xid(xid);
 557         if (tlink)
 558                 cifs_put_tlink(tlink);
 559         nd_set_link(nd, target_path);
 560         return NULL;
 561 }
 562
 563 int
 564 cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
 565 {
 566         int rc = -EOPNOTSUPP;
 567         unsigned int xid;
 568         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 569         struct tcon_link *tlink;
 570         struct cifs_tcon *pTcon;
 571         char *full_path = NULL;
 572         struct inode *newinode = NULL;
 573
 574         xid = get_xid();
 575
 576         tlink = cifs_sb_tlink(cifs_sb);
 577         if (IS_ERR(tlink)) {
 578                 rc = PTR_ERR(tlink);
 579                 goto symlink_exit;
 580         }
 581         pTcon = tlink_tcon(tlink);
 582
 583         full_path = build_path_from_dentry(direntry);
 584         if (full_path == NULL) {
 585                 rc = -ENOMEM;
 586                 goto symlink_exit;
 587         }
 588
 589         cifs_dbg(FYI, "Full path: %s\n", full_path);
 590         cifs_dbg(FYI, "symname is %s\n", symname);
 591
 592         /* BB what if DFS and this volume is on different share? BB */
 593         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 594                 rc = CIFSCreateMFSymLink(xid, pTcon, full_path, symname,
 595                                         cifs_sb);
 596         else if (pTcon->unix_ext)
 597                 rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
 598                                            cifs_sb->local_nls);
 599         /* else
 600            rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
 601                                         cifs_sb_target->local_nls); */
 602
 603         if (rc == 0) {
 604                 if (pTcon->unix_ext)
 605                         rc = cifs_get_inode_info_unix(&newinode, full_path,
 606                                                       inode->i_sb, xid);
 607                 else
 608                         rc = cifs_get_inode_info(&newinode, full_path, NULL,
 609                                                  inode->i_sb, xid, NULL);
 610
 611                 if (rc != 0) {
 612                         cifs_dbg(FYI, "Create symlink ok, getinodeinfo fail rc = %d\n",
 613                                  rc);
 614                 } else {
 615                         d_instantiate(direntry, newinode);
 616                 }
 617         }
 618 symlink_exit:
 619         kfree(full_path);
 620         cifs_put_tlink(tlink);
 621         free_xid(xid);
 622         return rc;
 623 }