fs/ncpfs/ioctl.c

   1 /*
   2  *  ioctl.c
   3  *
   4  *  Copyright (C) 1995, 1996 by Volker Lendecke
   5  *  Modified 1997 Peter Waltenberg, Bill Hawes, David Woodhouse for 2.1 dcache
   6  *  Modified 1998, 1999 Wolfram Pienkoss for NLS
   7  *
   8  */
   9
  10 #include <linux/config.h>
  11
  12 #include <asm/uaccess.h>
  13 #include <linux/errno.h>
  14 #include <linux/fs.h>
  15 #include <linux/ioctl.h>
  16 #include <linux/sched.h>
  17 #include <linux/mm.h>
  18 #include <linux/highuid.h>
  19 #include <linux/vmalloc.h>
  20
  21 #include <linux/ncp_fs.h>
  22
  23 #include "ncplib_kernel.h"
  24
  25 /* maximum limit for ncp_objectname_ioctl */
  26 #define NCP_OBJECT_NAME_MAX_LEN 4096
  27 /* maximum limit for ncp_privatedata_ioctl */
  28 #define NCP_PRIVATE_DATA_MAX_LEN 8192
  29 /* maximum negotiable packet size */
  30 #define NCP_PACKET_SIZE_INTERNAL 65536
  31
  32 int ncp_ioctl(struct inode *inode, struct file *filp,
  33               unsigned int cmd, unsigned long arg)
  34 {
  35         struct ncp_server *server = NCP_SERVER(inode);
  36         int result;
  37         struct ncp_ioctl_request request;
  38         char* bouncebuffer;
  39
  40         switch (cmd) {
  41         case NCP_IOC_NCPREQUEST:
  42
  43                 if ((permission(inode, MAY_WRITE) != 0)
  44                     && (current->uid != server->m.mounted_uid)) {
  45                         return -EACCES;
  46                 }
  47                 if (copy_from_user(&request, (struct ncp_ioctl_request *) arg,
  48                                sizeof(request)))
  49                         return -EFAULT;
  50
  51                 if ((request.function > 255)
  52                     || (request.size >
  53                   NCP_PACKET_SIZE - sizeof(struct ncp_request_header))) {
  54                         return -EINVAL;
  55                 }
  56                 bouncebuffer = vmalloc(NCP_PACKET_SIZE_INTERNAL);
  57                 if (!bouncebuffer)
  58                         return -ENOMEM;
  59                 if (copy_from_user(bouncebuffer, request.data, request.size)) {
  60                         vfree(bouncebuffer);
  61                         return -EFAULT;
  62                 }
  63                 ncp_lock_server(server);
  64
  65                 /* FIXME: We hack around in the server's structures
  66                    here to be able to use ncp_request */
  67
  68                 server->has_subfunction = 0;
  69                 server->current_size = request.size;
  70                 memcpy(server->packet, bouncebuffer, request.size);
  71
  72                 result = ncp_request2(server, request.function,
  73                         bouncebuffer, NCP_PACKET_SIZE_INTERNAL);
  74                 if (result < 0)
  75                         result = -EIO;
  76                 else
  77                         result = server->reply_size;
  78                 ncp_unlock_server(server);
  79                 DPRINTK("ncp_ioctl: copy %d bytes\n",
  80                         result);
  81                 if (result >= 0)
  82                         if (copy_to_user(request.data, bouncebuffer, result))
  83                                 result = -EFAULT;
  84                 vfree(bouncebuffer);
  85                 return result;
  86
  87         case NCP_IOC_CONN_LOGGED_IN:
  88
  89                 if (!capable(CAP_SYS_ADMIN))
  90                         return -EACCES;
  91                 if (!(server->m.int_flags & NCP_IMOUNT_LOGGEDIN_POSSIBLE))
  92                         return -EINVAL;
  93                 if (server->root_setuped)
  94                         return -EBUSY;
  95                 server->root_setuped = 1;
  96                 return ncp_conn_logged_in(inode->i_sb);
  97
  98         case NCP_IOC_GET_FS_INFO:
  99                 {
 100                         struct ncp_fs_info info;
 101
 102                         if ((permission(inode, MAY_WRITE) != 0)
 103                             && (current->uid != server->m.mounted_uid)) {
 104                                 return -EACCES;
 105                         }
 106                         if (copy_from_user(&info, (struct ncp_fs_info *) arg,
 107                                 sizeof(info)))
 108                                 return -EFAULT;
 109
 110                         if (info.version != NCP_GET_FS_INFO_VERSION) {
 111                                 DPRINTK("info.version invalid: %d\n", info.version);
 112                                 return -EINVAL;
 113                         }
 114                         /* TODO: info.addr = server->m.serv_addr; */
 115                         info.mounted_uid        = NEW_TO_OLD_UID(server->m.mounted_uid);
 116                         info.connection         = server->connection;
 117                         info.buffer_size        = server->buffer_size;
 118                         info.volume_number      = NCP_FINFO(inode)->volNumber;
 119                         info.directory_id       = NCP_FINFO(inode)->DosDirNum;
 120
 121                         if (copy_to_user((struct ncp_fs_info *) arg, &info,
 122                                 sizeof(info))) return -EFAULT;
 123                         return 0;
 124                 }
 125
 126         case NCP_IOC_GET_FS_INFO_V2:
 127                 {
 128                         struct ncp_fs_info_v2 info2;
 129
 130                         if ((permission(inode, MAY_WRITE) != 0)
 131                             && (current->uid != server->m.mounted_uid)) {
 132                                 return -EACCES;
 133                         }
 134                         if (copy_from_user(&info2, (struct ncp_fs_info_v2 *) arg,
 135                                 sizeof(info2)))
 136                                 return -EFAULT;
 137
 138                         if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
 139                                 DPRINTK("info.version invalid: %d\n", info2.version);
 140                                 return -EINVAL;
 141                         }
 142                         info2.mounted_uid   = server->m.mounted_uid;
 143                         info2.connection    = server->connection;
 144                         info2.buffer_size   = server->buffer_size;
 145                         info2.volume_number = NCP_FINFO(inode)->volNumber;
 146                         info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
 147                         info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;
 148
 149                         if (copy_to_user((struct ncp_fs_info_v2 *) arg, &info2,
 150                                 sizeof(info2))) return -EFAULT;
 151                         return 0;
 152                 }
 153
 154         case NCP_IOC_GETMOUNTUID2:
 155                 {
 156                         unsigned long tmp = server->m.mounted_uid;
 157
 158                         if (   (permission(inode, MAY_READ) != 0)
 159                             && (current->uid != server->m.mounted_uid))
 160                         {
 161                                 return -EACCES;
 162                         }
 163                         if (put_user(tmp, (unsigned long*) arg))
 164                                 return -EFAULT;
 165                         return 0;
 166                 }
 167
 168         case NCP_IOC_GETROOT:
 169                 {
 170                         struct ncp_setroot_ioctl sr;
 171
 172                         if (   (permission(inode, MAY_READ) != 0)
 173                             && (current->uid != server->m.mounted_uid))
 174                         {
 175                                 return -EACCES;
 176                         }
 177                         if (server->m.mounted_vol[0]) {
 178                                 struct dentry* dentry = inode->i_sb->s_root;
 179
 180                                 if (dentry) {
 181                                         struct inode* inode = dentry->d_inode;
 182
 183                                         if (inode) {
 184                                                 sr.volNumber = NCP_FINFO(inode)->volNumber;
 185                                                 sr.dirEntNum = NCP_FINFO(inode)->dirEntNum;
 186                                                 sr.namespace = server->name_space[sr.volNumber];
 187                                         } else
 188                                                 DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 189                                 } else
 190                                         DPRINTK("ncpfs: s_root==NULL\n");
 191                         } else {
 192                                 sr.volNumber = -1;
 193                                 sr.namespace = 0;
 194                                 sr.dirEntNum = 0;
 195                         }
 196                         if (copy_to_user((struct ncp_setroot_ioctl*)arg,
 197                                           &sr,
 198                                           sizeof(sr))) return -EFAULT;
 199                         return 0;
 200                 }
 201         case NCP_IOC_SETROOT:
 202                 {
 203                         struct ncp_setroot_ioctl sr;
 204                         struct nw_info_struct i;
 205                         struct dentry* dentry;
 206
 207                         if (!capable(CAP_SYS_ADMIN))
 208                         {
 209                                 return -EACCES;
 210                         }
 211                         if (server->root_setuped) return -EBUSY;
 212                         if (copy_from_user(&sr,
 213                                            (struct ncp_setroot_ioctl*)arg,
 214                                            sizeof(sr))) return -EFAULT;
 215                         if (sr.volNumber < 0) {
 216                                 server->m.mounted_vol[0] = 0;
 217                                 i.volNumber = NCP_NUMBER_OF_VOLUMES + 1;
 218                                 i.dirEntNum = 0;
 219                                 i.DosDirNum = 0;
 220                         } else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
 221                                 return -EINVAL;
 222                         } else
 223                                 if (ncp_mount_subdir(server, &i, sr.volNumber,
 224                                                 sr.namespace, sr.dirEntNum))
 225                                         return -ENOENT;
 226
 227                         dentry = inode->i_sb->s_root;
 228                         server->root_setuped = 1;
 229                         if (dentry) {
 230                                 struct inode* inode = dentry->d_inode;
 231
 232                                 if (inode) {
 233                                         NCP_FINFO(inode)->volNumber = i.volNumber;
 234                                         NCP_FINFO(inode)->dirEntNum = i.dirEntNum;
 235                                         NCP_FINFO(inode)->DosDirNum = i.DosDirNum;
 236                                 } else
 237                                         DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 238                         } else
 239                                 DPRINTK("ncpfs: s_root==NULL\n");
 240
 241                         return 0;
 242                 }
 243
 244 #ifdef CONFIG_NCPFS_PACKET_SIGNING
 245         case NCP_IOC_SIGN_INIT:
 246                 if ((permission(inode, MAY_WRITE) != 0)
 247                     && (current->uid != server->m.mounted_uid))
 248                 {
 249                         return -EACCES;
 250                 }
 251                 if (arg) {
 252                         if (server->sign_wanted)
 253                         {
 254                                 struct ncp_sign_init sign;
 255
 256                                 if (copy_from_user(&sign, (struct ncp_sign_init *) arg,
 257                                       sizeof(sign))) return -EFAULT;
 258                                 memcpy(server->sign_root,sign.sign_root,8);
 259                                 memcpy(server->sign_last,sign.sign_last,16);
 260                                 server->sign_active = 1;
 261                         }
 262                         /* ignore when signatures not wanted */
 263                 } else {
 264                         server->sign_active = 0;
 265                 }
 266                 return 0;
 267
 268         case NCP_IOC_SIGN_WANTED:
 269                 if (   (permission(inode, MAY_READ) != 0)
 270                     && (current->uid != server->m.mounted_uid))
 271                 {
 272                         return -EACCES;
 273                 }
 274
 275                 if (put_user(server->sign_wanted, (int*) arg))
 276                         return -EFAULT;
 277                 return 0;
 278         case NCP_IOC_SET_SIGN_WANTED:
 279                 {
 280                         int newstate;
 281
 282                         if (   (permission(inode, MAY_WRITE) != 0)
 283                             && (current->uid != server->m.mounted_uid))
 284                         {
 285                                 return -EACCES;
 286                         }
 287                         /* get only low 8 bits... */
 288                         if (get_user(newstate, (unsigned char *) arg))
 289                                 return -EFAULT;
 290                         if (server->sign_active) {
 291                                 /* cannot turn signatures OFF when active */
 292                                 if (!newstate) return -EINVAL;
 293                         } else {
 294                                 server->sign_wanted = newstate != 0;
 295                         }
 296                         return 0;
 297                 }
 298
 299 #endif /* CONFIG_NCPFS_PACKET_SIGNING */
 300
 301 #ifdef CONFIG_NCPFS_IOCTL_LOCKING
 302         case NCP_IOC_LOCKUNLOCK:
 303                 if (   (permission(inode, MAY_WRITE) != 0)
 304                     && (current->uid != server->m.mounted_uid))
 305                 {
 306                         return -EACCES;
 307                 }
 308                 {
 309                         struct ncp_lock_ioctl    rqdata;
 310                         int result;
 311
 312                         if (copy_from_user(&rqdata, (struct ncp_lock_ioctl*)arg,
 313                                 sizeof(rqdata))) return -EFAULT;
 314                         if (rqdata.origin != 0)
 315                                 return -EINVAL;
 316                         /* check for cmd */
 317                         switch (rqdata.cmd) {
 318                                 case NCP_LOCK_EX:
 319                                 case NCP_LOCK_SH:
 320                                                 if (rqdata.timeout == 0)
 321                                                         rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
 322                                                 else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
 323                                                         rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
 324                                                 break;
 325                                 case NCP_LOCK_LOG:
 326                                                 rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;      /* has no effect */
 327                                 case NCP_LOCK_CLEAR:
 328                                                 break;
 329                                 default:
 330                                                 return -EINVAL;
 331                         }
 332                         /* locking needs both read and write access */
 333                         if ((result = ncp_make_open(inode, O_RDWR)) != 0)
 334                         {
 335                                 return result;
 336                         }
 337                         result = -EIO;
 338                         if (!ncp_conn_valid(server))
 339                                 goto outrel;
 340                         result = -EISDIR;
 341                         if (!S_ISREG(inode->i_mode))
 342                                 goto outrel;
 343                         if (rqdata.cmd == NCP_LOCK_CLEAR)
 344                         {
 345                                 result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
 346                                                         NCP_FINFO(inode)->file_handle,
 347                                                         rqdata.offset,
 348                                                         rqdata.length);
 349                                 if (result > 0) result = 0;     /* no such lock */
 350                         }
 351                         else
 352                         {
 353                                 int lockcmd;
 354
 355                                 switch (rqdata.cmd)
 356                                 {
 357                                         case NCP_LOCK_EX:  lockcmd=1; break;
 358                                         case NCP_LOCK_SH:  lockcmd=3; break;
 359                                         default:           lockcmd=0; break;
 360                                 }
 361                                 result = ncp_LogPhysicalRecord(NCP_SERVER(inode),
 362                                                         NCP_FINFO(inode)->file_handle,
 363                                                         lockcmd,
 364                                                         rqdata.offset,
 365                                                         rqdata.length,
 366                                                         rqdata.timeout);
 367                                 if (result > 0) result = -EAGAIN;
 368                         }
 369 outrel:
 370                         ncp_inode_close(inode);
 371                         return result;
 372                 }
 373 #endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 374
 375         case NCP_IOC_GETOBJECTNAME:
 376                 if (current->uid != server->m.mounted_uid) {
 377                         return -EACCES;
 378                 }
 379                 {
 380                         struct ncp_objectname_ioctl user;
 381                         size_t outl;
 382
 383                         if (copy_from_user(&user,
 384                                            (struct ncp_objectname_ioctl*)arg,
 385                                            sizeof(user))) return -EFAULT;
 386                         user.auth_type = server->auth.auth_type;
 387                         outl = user.object_name_len;
 388                         user.object_name_len = server->auth.object_name_len;
 389                         if (outl > user.object_name_len)
 390                                 outl = user.object_name_len;
 391                         if (outl) {
 392                                 if (copy_to_user(user.object_name,
 393                                                  server->auth.object_name,
 394                                                  outl)) return -EFAULT;
 395                         }
 396                         if (copy_to_user((struct ncp_objectname_ioctl*)arg,
 397                                          &user,
 398                                          sizeof(user))) return -EFAULT;
 399                         return 0;
 400                 }
 401         case NCP_IOC_SETOBJECTNAME:
 402                 if (current->uid != server->m.mounted_uid) {
 403                         return -EACCES;
 404                 }
 405                 {
 406                         struct ncp_objectname_ioctl user;
 407                         void* newname;
 408                         void* oldname;
 409                         size_t oldnamelen;
 410                         void* oldprivate;
 411                         size_t oldprivatelen;
 412
 413                         if (copy_from_user(&user,
 414                                            (struct ncp_objectname_ioctl*)arg,
 415                                            sizeof(user))) return -EFAULT;
 416                         if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
 417                                 return -ENOMEM;
 418                         if (user.object_name_len) {
 419                                 newname = ncp_kmalloc(user.object_name_len, GFP_USER);
 420                                 if (!newname) return -ENOMEM;
 421                                 if (copy_from_user(newname, user.object_name, user.object_name_len)) {
 422                                         ncp_kfree_s(newname, user.object_name_len);
 423                                         return -EFAULT;
 424                                 }
 425                         } else {
 426                                 newname = NULL;
 427                         }
 428                         /* enter critical section */
 429                         /* maybe that kfree can sleep so do that this way */
 430                         /* it is at least more SMP friendly (in future...) */
 431                         oldname = server->auth.object_name;
 432                         oldnamelen = server->auth.object_name_len;
 433                         oldprivate = server->priv.data;
 434                         oldprivatelen = server->priv.len;
 435                         server->auth.auth_type = user.auth_type;
 436                         server->auth.object_name_len = user.object_name_len;
 437                         server->auth.object_name = newname;
 438                         server->priv.len = 0;
 439                         server->priv.data = NULL;
 440                         /* leave critical section */
 441                         if (oldprivate) ncp_kfree_s(oldprivate, oldprivatelen);
 442                         if (oldname) ncp_kfree_s(oldname, oldnamelen);
 443                         return 0;
 444                 }
 445         case NCP_IOC_GETPRIVATEDATA:
 446                 if (current->uid != server->m.mounted_uid) {
 447                         return -EACCES;
 448                 }
 449                 {
 450                         struct ncp_privatedata_ioctl user;
 451                         size_t outl;
 452
 453                         if (copy_from_user(&user,
 454                                            (struct ncp_privatedata_ioctl*)arg,
 455                                            sizeof(user))) return -EFAULT;
 456                         outl = user.len;
 457                         user.len = server->priv.len;
 458                         if (outl > user.len) outl = user.len;
 459                         if (outl) {
 460                                 if (copy_to_user(user.data,
 461                                                  server->priv.data,
 462                                                  outl)) return -EFAULT;
 463                         }
 464                         if (copy_to_user((struct ncp_privatedata_ioctl*)arg,
 465                                          &user,
 466                                          sizeof(user))) return -EFAULT;
 467                         return 0;
 468                 }
 469         case NCP_IOC_SETPRIVATEDATA:
 470                 if (current->uid != server->m.mounted_uid) {
 471                         return -EACCES;
 472                 }
 473                 {
 474                         struct ncp_privatedata_ioctl user;
 475                         void* new;
 476                         void* old;
 477                         size_t oldlen;
 478
 479                         if (copy_from_user(&user,
 480                                            (struct ncp_privatedata_ioctl*)arg,
 481                                            sizeof(user))) return -EFAULT;
 482                         if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
 483                                 return -ENOMEM;
 484                         if (user.len) {
 485                                 new = ncp_kmalloc(user.len, GFP_USER);
 486                                 if (!new) return -ENOMEM;
 487                                 if (copy_from_user(new, user.data, user.len)) {
 488                                         ncp_kfree_s(new, user.len);
 489                                         return -EFAULT;
 490                                 }
 491                         } else {
 492                                 new = NULL;
 493                         }
 494                         /* enter critical section */
 495                         old = server->priv.data;
 496                         oldlen = server->priv.len;
 497                         server->priv.len = user.len;
 498                         server->priv.data = new;
 499                         /* leave critical section */
 500                         if (old) ncp_kfree_s(old, oldlen);
 501                         return 0;
 502                 }
 503
 504 #ifdef CONFIG_NCPFS_NLS
 505 /* Here we are select the iocharset and the codepage for NLS.
 506  * Thanks Petr Vandrovec for idea and many hints.
 507  */
 508         case NCP_IOC_SETCHARSETS:
 509                 if (!capable(CAP_SYS_ADMIN))
 510                         return -EACCES;
 511                 if (server->root_setuped)
 512                         return -EBUSY;
 513
 514                 {
 515                         struct ncp_nls_ioctl user;
 516                         struct nls_table *codepage;
 517                         struct nls_table *iocharset;
 518                         struct nls_table *oldset_io;
 519                         struct nls_table *oldset_cp;
 520
 521                         if (copy_from_user(&user, (struct ncp_nls_ioctl*)arg,
 522                                         sizeof(user)))
 523                                 return -EFAULT;
 524
 525                         codepage = NULL;
 526                         user.codepage[NCP_IOCSNAME_LEN] = 0;
 527                         if (!user.codepage[0] ||
 528                                         !strcmp(user.codepage, "default"))
 529                                 codepage = load_nls_default();
 530                         else {
 531                                 codepage = load_nls(user.codepage);
 532                                 if (!codepage) {
 533                                         return -EBADRQC;
 534                                 }
 535                         }
 536
 537                         iocharset = NULL;
 538                         user.iocharset[NCP_IOCSNAME_LEN] = 0;
 539                         if (!user.iocharset[0] ||
 540                                         !strcmp(user.iocharset, "default")) {
 541                                 iocharset = load_nls_default();
 542                                 NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
 543                         } else {
 544                                 if (!strcmp(user.iocharset, "utf8")) {
 545                                         iocharset = load_nls_default();
 546                                         NCP_SET_FLAG(server, NCP_FLAG_UTF8);
 547                                 } else {
 548                                         iocharset = load_nls(user.iocharset);
 549                                         if (!iocharset) {
 550                                                 unload_nls(codepage);
 551                                                 return -EBADRQC;
 552                                         }
 553                                         NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
 554                                 }
 555                         }
 556
 557                         oldset_cp = server->nls_vol;
 558                         server->nls_vol = codepage;
 559                         oldset_io = server->nls_io;
 560                         server->nls_io = iocharset;
 561
 562                         if (oldset_cp)
 563                                 unload_nls(oldset_cp);
 564                         if (oldset_io)
 565                                 unload_nls(oldset_io);
 566
 567                         return 0;
 568                 }
 569
 570         case NCP_IOC_GETCHARSETS: /* not tested */
 571                 {
 572                         struct ncp_nls_ioctl user;
 573                         int len;
 574
 575                         memset(&user, 0, sizeof(user));
 576                         if (server->nls_vol && server->nls_vol->charset) {
 577                                 len = strlen(server->nls_vol->charset);
 578                                 if (len > NCP_IOCSNAME_LEN)
 579                                         len = NCP_IOCSNAME_LEN;
 580                                 strncpy(user.codepage,
 581                                                 server->nls_vol->charset, len);
 582                                 user.codepage[len] = 0;
 583                         }
 584
 585                         if (NCP_IS_FLAG(server, NCP_FLAG_UTF8))
 586                                 strcpy(user.iocharset, "utf8");
 587                         else
 588                                 if (server->nls_io && server->nls_io->charset) {
 589                                         len = strlen(server->nls_io->charset);
 590                                         if (len > NCP_IOCSNAME_LEN)
 591                                                 len = NCP_IOCSNAME_LEN;
 592                                         strncpy(user.iocharset,
 593                                                 server->nls_io->charset, len);
 594                                         user.iocharset[len] = 0;
 595                                 }
 596
 597                         if (copy_to_user((struct ncp_nls_ioctl*)arg, &user,
 598                                         sizeof(user)))
 599                                 return -EFAULT;
 600
 601                         return 0;
 602                 }
 603 #endif /* CONFIG_NCPFS_NLS */
 604         case NCP_IOC_SETDENTRYTTL:
 605                 if ((permission(inode, MAY_WRITE) != 0) &&
 606                                  (current->uid != server->m.mounted_uid))
 607                         return -EACCES;
 608                 {
 609                         u_int32_t user;
 610
 611                         if (copy_from_user(&user, (u_int32_t*)arg, sizeof(user)))
 612                                 return -EFAULT;
 613                         /* 20 secs at most... */
 614                         if (user > 20000)
 615                                 return -EINVAL;
 616                         user = (user * HZ) / 1000;
 617                         server->dentry_ttl = user;
 618                         return 0;
 619                 }
 620
 621         case NCP_IOC_GETDENTRYTTL:
 622                 {
 623                         u_int32_t user = (server->dentry_ttl * 1000) / HZ;
 624                         if (copy_to_user((u_int32_t*)arg, &user, sizeof(user)))
 625                                 return -EFAULT;
 626                         return 0;
 627                 }
 628
 629         }
 630 /* #ifdef CONFIG_UID16 */
 631         /* NCP_IOC_GETMOUNTUID may be same as NCP_IOC_GETMOUNTUID2,
 632            so we have this out of switch */
 633         if (cmd == NCP_IOC_GETMOUNTUID) {
 634                 if ((permission(inode, MAY_READ) != 0)
 635                     && (current->uid != server->m.mounted_uid)) {
 636                         return -EACCES;
 637                 }
 638                 if (put_user(NEW_TO_OLD_UID(server->m.mounted_uid), (__kernel_uid_t *) arg))
 639                         return -EFAULT;
 640                 return 0;
 641         }
 642 /* #endif */
 643         return -EINVAL;
 644 }