linux/fs/cifs/link.c
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   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
  48static int
  49symlink_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
  86symlink_hash_err:
  87        crypto_free_shash(md5);
  88        kfree(sdescmd5);
  89
  90        return rc;
  91}
  92
  93static int
  94CIFSParseMFSymlink(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
 139static int
 140CIFSFormatMFSymlink(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
 183static int
 184CIFSCreateMFSymLink(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
 240static int
 241CIFSQueryMFSymLink(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
 293bool
 294CIFSCouldBeMFSymlink(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
 307int
 308open_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
 356int
 357CIFSCheckMFSymlink(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;
 405out:
 406        kfree(buf);
 407        return rc;
 408}
 409
 410int
 411cifs_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
 493cifs_hl_exit:
 494        kfree(from_name);
 495        kfree(to_name);
 496        free_xid(xid);
 497        cifs_put_tlink(tlink);
 498        return rc;
 499}
 500
 501void *
 502cifs_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
 513        xid = get_xid();
 514
 515        tlink = cifs_sb_tlink(cifs_sb);
 516        if (IS_ERR(tlink)) {
 517                rc = PTR_ERR(tlink);
 518                tlink = NULL;
 519                goto out;
 520        }
 521        tcon = tlink_tcon(tlink);
 522
 523        /*
 524         * For now, we just handle symlinks with unix extensions enabled.
 525         * Eventually we should handle NTFS reparse points, and MacOS
 526         * symlink support. For instance...
 527         *
 528         * rc = CIFSSMBQueryReparseLinkInfo(...)
 529         *
 530         * For now, just return -EACCES when the server doesn't support posix
 531         * extensions. Note that we still allow querying symlinks when posix
 532         * extensions are manually disabled. We could disable these as well
 533         * but there doesn't seem to be any harm in allowing the client to
 534         * read them.
 535         */
 536        if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS) &&
 537            !cap_unix(tcon->ses)) {
 538                rc = -EACCES;
 539                goto out;
 540        }
 541
 542        full_path = build_path_from_dentry(direntry);
 543        if (!full_path)
 544                goto out;
 545
 546        cifs_dbg(FYI, "Full path: %s inode = 0x%p\n", full_path, inode);
 547
 548        rc = -EACCES;
 549        /*
 550         * First try Minshall+French Symlinks, if configured
 551         * and fallback to UNIX Extensions Symlinks.
 552         */
 553        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 554                rc = CIFSQueryMFSymLink(xid, tcon, full_path, &target_path,
 555                                        cifs_sb->local_nls,
 556                                        cifs_sb->mnt_cifs_flags &
 557                                                CIFS_MOUNT_MAP_SPECIAL_CHR);
 558
 559        if ((rc != 0) && cap_unix(tcon->ses))
 560                rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, &target_path,
 561                                             cifs_sb->local_nls);
 562
 563        kfree(full_path);
 564out:
 565        if (rc != 0) {
 566                kfree(target_path);
 567                target_path = ERR_PTR(rc);
 568        }
 569
 570        free_xid(xid);
 571        if (tlink)
 572                cifs_put_tlink(tlink);
 573        nd_set_link(nd, target_path);
 574        return NULL;
 575}
 576
 577int
 578cifs_symlink(struct inode *inode, struct dentry *direntry, const char *symname)
 579{
 580        int rc = -EOPNOTSUPP;
 581        unsigned int xid;
 582        struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 583        struct tcon_link *tlink;
 584        struct cifs_tcon *pTcon;
 585        char *full_path = NULL;
 586        struct inode *newinode = NULL;
 587
 588        xid = get_xid();
 589
 590        tlink = cifs_sb_tlink(cifs_sb);
 591        if (IS_ERR(tlink)) {
 592                rc = PTR_ERR(tlink);
 593                goto symlink_exit;
 594        }
 595        pTcon = tlink_tcon(tlink);
 596
 597        full_path = build_path_from_dentry(direntry);
 598        if (full_path == NULL) {
 599                rc = -ENOMEM;
 600                goto symlink_exit;
 601        }
 602
 603        cifs_dbg(FYI, "Full path: %s\n", full_path);
 604        cifs_dbg(FYI, "symname is %s\n", symname);
 605
 606        /* BB what if DFS and this volume is on different share? BB */
 607        if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 608                rc = CIFSCreateMFSymLink(xid, pTcon, full_path, symname,
 609                                        cifs_sb);
 610        else if (pTcon->unix_ext)
 611                rc = CIFSUnixCreateSymLink(xid, pTcon, full_path, symname,
 612                                           cifs_sb->local_nls);
 613        /* else
 614           rc = CIFSCreateReparseSymLink(xid, pTcon, fromName, toName,
 615                                        cifs_sb_target->local_nls); */
 616
 617        if (rc == 0) {
 618                if (pTcon->unix_ext)
 619                        rc = cifs_get_inode_info_unix(&newinode, full_path,
 620                                                      inode->i_sb, xid);
 621                else
 622                        rc = cifs_get_inode_info(&newinode, full_path, NULL,
 623                                                 inode->i_sb, xid, NULL);
 624
 625                if (rc != 0) {
 626                        cifs_dbg(FYI, "Create symlink ok, getinodeinfo fail rc = %d\n",
 627                                 rc);
 628                } else {
 629                        d_instantiate(direntry, newinode);
 630                }
 631        }
 632symlink_exit:
 633        kfree(full_path);
 634        cifs_put_tlink(tlink);
 635        free_xid(xid);
 636        return rc;
 637}
 638
 639void cifs_put_link(struct dentry *direntry, struct nameidata *nd, void *cookie)
 640{
 641        char *p = nd_get_link(nd);
 642        if (!IS_ERR(p))
 643                kfree(p);
 644}
 645
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