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
  11 #include <asm/uaccess.h>
  12 #include <linux/capability.h>
  13 #include <linux/errno.h>
  14 #include <linux/fs.h>
  15 #include <linux/ioctl.h>
  16 #include <linux/time.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 static int
  33 ncp_get_fs_info(struct ncp_server * server, struct file *file,
  34                 struct ncp_fs_info __user *arg)
  35 {
  36         struct inode *inode = file->f_dentry->d_inode;
  37         struct ncp_fs_info info;
  38
  39         if ((file_permission(file, MAY_WRITE) != 0)
  40             && (current->uid != server->m.mounted_uid)) {
  41                 return -EACCES;
  42         }
  43         if (copy_from_user(&info, arg, sizeof(info)))
  44                 return -EFAULT;
  45
  46         if (info.version != NCP_GET_FS_INFO_VERSION) {
  47                 DPRINTK("info.version invalid: %d\n", info.version);
  48                 return -EINVAL;
  49         }
  50         /* TODO: info.addr = server->m.serv_addr; */
  51         SET_UID(info.mounted_uid, server->m.mounted_uid);
  52         info.connection         = server->connection;
  53         info.buffer_size        = server->buffer_size;
  54         info.volume_number      = NCP_FINFO(inode)->volNumber;
  55         info.directory_id       = NCP_FINFO(inode)->DosDirNum;
  56
  57         if (copy_to_user(arg, &info, sizeof(info)))
  58                 return -EFAULT;
  59         return 0;
  60 }
  61
  62 static int
  63 ncp_get_fs_info_v2(struct ncp_server * server, struct file *file,
  64                    struct ncp_fs_info_v2 __user * arg)
  65 {
  66         struct inode *inode = file->f_dentry->d_inode;
  67         struct ncp_fs_info_v2 info2;
  68
  69         if ((file_permission(file, MAY_WRITE) != 0)
  70             && (current->uid != server->m.mounted_uid)) {
  71                 return -EACCES;
  72         }
  73         if (copy_from_user(&info2, arg, sizeof(info2)))
  74                 return -EFAULT;
  75
  76         if (info2.version != NCP_GET_FS_INFO_VERSION_V2) {
  77                 DPRINTK("info.version invalid: %d\n", info2.version);
  78                 return -EINVAL;
  79         }
  80         info2.mounted_uid   = server->m.mounted_uid;
  81         info2.connection    = server->connection;
  82         info2.buffer_size   = server->buffer_size;
  83         info2.volume_number = NCP_FINFO(inode)->volNumber;
  84         info2.directory_id  = NCP_FINFO(inode)->DosDirNum;
  85         info2.dummy1 = info2.dummy2 = info2.dummy3 = 0;
  86
  87         if (copy_to_user(arg, &info2, sizeof(info2)))
  88                 return -EFAULT;
  89         return 0;
  90 }
  91
  92 #ifdef CONFIG_NCPFS_NLS
  93 /* Here we are select the iocharset and the codepage for NLS.
  94  * Thanks Petr Vandrovec for idea and many hints.
  95  */
  96 static int
  97 ncp_set_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
  98 {
  99         struct ncp_nls_ioctl user;
 100         struct nls_table *codepage;
 101         struct nls_table *iocharset;
 102         struct nls_table *oldset_io;
 103         struct nls_table *oldset_cp;
 104
 105         if (!capable(CAP_SYS_ADMIN))
 106                 return -EACCES;
 107         if (server->root_setuped)
 108                 return -EBUSY;
 109
 110         if (copy_from_user(&user, arg, sizeof(user)))
 111                 return -EFAULT;
 112
 113         codepage = NULL;
 114         user.codepage[NCP_IOCSNAME_LEN] = 0;
 115         if (!user.codepage[0] || !strcmp(user.codepage, "default"))
 116                 codepage = load_nls_default();
 117         else {
 118                 codepage = load_nls(user.codepage);
 119                 if (!codepage) {
 120                         return -EBADRQC;
 121                 }
 122         }
 123
 124         iocharset = NULL;
 125         user.iocharset[NCP_IOCSNAME_LEN] = 0;
 126         if (!user.iocharset[0] || !strcmp(user.iocharset, "default")) {
 127                 iocharset = load_nls_default();
 128                 NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
 129         } else if (!strcmp(user.iocharset, "utf8")) {
 130                 iocharset = load_nls_default();
 131                 NCP_SET_FLAG(server, NCP_FLAG_UTF8);
 132         } else {
 133                 iocharset = load_nls(user.iocharset);
 134                 if (!iocharset) {
 135                         unload_nls(codepage);
 136                         return -EBADRQC;
 137                 }
 138                 NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
 139         }
 140
 141         oldset_cp = server->nls_vol;
 142         server->nls_vol = codepage;
 143         oldset_io = server->nls_io;
 144         server->nls_io = iocharset;
 145
 146         if (oldset_cp)
 147                 unload_nls(oldset_cp);
 148         if (oldset_io)
 149                 unload_nls(oldset_io);
 150
 151         return 0;
 152 }
 153
 154 static int
 155 ncp_get_charsets(struct ncp_server* server, struct ncp_nls_ioctl __user *arg)
 156 {
 157         struct ncp_nls_ioctl user;
 158         int len;
 159
 160         memset(&user, 0, sizeof(user));
 161         if (server->nls_vol && server->nls_vol->charset) {
 162                 len = strlen(server->nls_vol->charset);
 163                 if (len > NCP_IOCSNAME_LEN)
 164                         len = NCP_IOCSNAME_LEN;
 165                 strncpy(user.codepage, server->nls_vol->charset, len);
 166                 user.codepage[len] = 0;
 167         }
 168
 169         if (NCP_IS_FLAG(server, NCP_FLAG_UTF8))
 170                 strcpy(user.iocharset, "utf8");
 171         else if (server->nls_io && server->nls_io->charset) {
 172                 len = strlen(server->nls_io->charset);
 173                 if (len > NCP_IOCSNAME_LEN)
 174                         len = NCP_IOCSNAME_LEN;
 175                 strncpy(user.iocharset, server->nls_io->charset, len);
 176                 user.iocharset[len] = 0;
 177         }
 178
 179         if (copy_to_user(arg, &user, sizeof(user)))
 180                 return -EFAULT;
 181         return 0;
 182 }
 183 #endif /* CONFIG_NCPFS_NLS */
 184
 185 int ncp_ioctl(struct inode *inode, struct file *filp,
 186               unsigned int cmd, unsigned long arg)
 187 {
 188         struct ncp_server *server = NCP_SERVER(inode);
 189         int result;
 190         struct ncp_ioctl_request request;
 191         char* bouncebuffer;
 192         void __user *argp = (void __user *)arg;
 193
 194         switch (cmd) {
 195         case NCP_IOC_NCPREQUEST:
 196
 197                 if ((file_permission(filp, MAY_WRITE) != 0)
 198                     && (current->uid != server->m.mounted_uid)) {
 199                         return -EACCES;
 200                 }
 201                 if (copy_from_user(&request, argp, sizeof(request)))
 202                         return -EFAULT;
 203
 204                 if ((request.function > 255)
 205                     || (request.size >
 206                   NCP_PACKET_SIZE - sizeof(struct ncp_request_header))) {
 207                         return -EINVAL;
 208                 }
 209                 bouncebuffer = vmalloc(NCP_PACKET_SIZE_INTERNAL);
 210                 if (!bouncebuffer)
 211                         return -ENOMEM;
 212                 if (copy_from_user(bouncebuffer, request.data, request.size)) {
 213                         vfree(bouncebuffer);
 214                         return -EFAULT;
 215                 }
 216                 ncp_lock_server(server);
 217
 218                 /* FIXME: We hack around in the server's structures
 219                    here to be able to use ncp_request */
 220
 221                 server->has_subfunction = 0;
 222                 server->current_size = request.size;
 223                 memcpy(server->packet, bouncebuffer, request.size);
 224
 225                 result = ncp_request2(server, request.function,
 226                         bouncebuffer, NCP_PACKET_SIZE_INTERNAL);
 227                 if (result < 0)
 228                         result = -EIO;
 229                 else
 230                         result = server->reply_size;
 231                 ncp_unlock_server(server);
 232                 DPRINTK("ncp_ioctl: copy %d bytes\n",
 233                         result);
 234                 if (result >= 0)
 235                         if (copy_to_user(request.data, bouncebuffer, result))
 236                                 result = -EFAULT;
 237                 vfree(bouncebuffer);
 238                 return result;
 239
 240         case NCP_IOC_CONN_LOGGED_IN:
 241
 242                 if (!capable(CAP_SYS_ADMIN))
 243                         return -EACCES;
 244                 if (!(server->m.int_flags & NCP_IMOUNT_LOGGEDIN_POSSIBLE))
 245                         return -EINVAL;
 246                 if (server->root_setuped)
 247                         return -EBUSY;
 248                 server->root_setuped = 1;
 249                 return ncp_conn_logged_in(inode->i_sb);
 250
 251         case NCP_IOC_GET_FS_INFO:
 252                 return ncp_get_fs_info(server, filp, argp);
 253
 254         case NCP_IOC_GET_FS_INFO_V2:
 255                 return ncp_get_fs_info_v2(server, filp, argp);
 256
 257         case NCP_IOC_GETMOUNTUID2:
 258                 {
 259                         unsigned long tmp = server->m.mounted_uid;
 260
 261                         if ((file_permission(filp, MAY_READ) != 0)
 262                             && (current->uid != server->m.mounted_uid))
 263                         {
 264                                 return -EACCES;
 265                         }
 266                         if (put_user(tmp, (unsigned long __user *)argp))
 267                                 return -EFAULT;
 268                         return 0;
 269                 }
 270
 271         case NCP_IOC_GETROOT:
 272                 {
 273                         struct ncp_setroot_ioctl sr;
 274
 275                         if ((file_permission(filp, MAY_READ) != 0)
 276                             && (current->uid != server->m.mounted_uid))
 277                         {
 278                                 return -EACCES;
 279                         }
 280                         if (server->m.mounted_vol[0]) {
 281                                 struct dentry* dentry = inode->i_sb->s_root;
 282
 283                                 if (dentry) {
 284                                         struct inode* inode = dentry->d_inode;
 285
 286                                         if (inode) {
 287                                                 sr.volNumber = NCP_FINFO(inode)->volNumber;
 288                                                 sr.dirEntNum = NCP_FINFO(inode)->dirEntNum;
 289                                                 sr.namespace = server->name_space[sr.volNumber];
 290                                         } else
 291                                                 DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 292                                 } else
 293                                         DPRINTK("ncpfs: s_root==NULL\n");
 294                         } else {
 295                                 sr.volNumber = -1;
 296                                 sr.namespace = 0;
 297                                 sr.dirEntNum = 0;
 298                         }
 299                         if (copy_to_user(argp, &sr, sizeof(sr)))
 300                                 return -EFAULT;
 301                         return 0;
 302                 }
 303         case NCP_IOC_SETROOT:
 304                 {
 305                         struct ncp_setroot_ioctl sr;
 306                         __u32 vnum;
 307                         __le32 de;
 308                         __le32 dosde;
 309                         struct dentry* dentry;
 310
 311                         if (!capable(CAP_SYS_ADMIN))
 312                         {
 313                                 return -EACCES;
 314                         }
 315                         if (server->root_setuped) return -EBUSY;
 316                         if (copy_from_user(&sr, argp, sizeof(sr)))
 317                                 return -EFAULT;
 318                         if (sr.volNumber < 0) {
 319                                 server->m.mounted_vol[0] = 0;
 320                                 vnum = NCP_NUMBER_OF_VOLUMES;
 321                                 de = 0;
 322                                 dosde = 0;
 323                         } else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
 324                                 return -EINVAL;
 325                         } else if (ncp_mount_subdir(server, sr.volNumber,
 326                                                 sr.namespace, sr.dirEntNum,
 327                                                 &vnum, &de, &dosde)) {
 328                                 return -ENOENT;
 329                         }
 330
 331                         dentry = inode->i_sb->s_root;
 332                         server->root_setuped = 1;
 333                         if (dentry) {
 334                                 struct inode* inode = dentry->d_inode;
 335
 336                                 if (inode) {
 337                                         NCP_FINFO(inode)->volNumber = vnum;
 338                                         NCP_FINFO(inode)->dirEntNum = de;
 339                                         NCP_FINFO(inode)->DosDirNum = dosde;
 340                                 } else
 341                                         DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 342                         } else
 343                                 DPRINTK("ncpfs: s_root==NULL\n");
 344
 345                         return 0;
 346                 }
 347
 348 #ifdef CONFIG_NCPFS_PACKET_SIGNING
 349         case NCP_IOC_SIGN_INIT:
 350                 if ((file_permission(filp, MAY_WRITE) != 0)
 351                     && (current->uid != server->m.mounted_uid))
 352                 {
 353                         return -EACCES;
 354                 }
 355                 if (argp) {
 356                         if (server->sign_wanted)
 357                         {
 358                                 struct ncp_sign_init sign;
 359
 360                                 if (copy_from_user(&sign, argp, sizeof(sign)))
 361                                         return -EFAULT;
 362                                 memcpy(server->sign_root,sign.sign_root,8);
 363                                 memcpy(server->sign_last,sign.sign_last,16);
 364                                 server->sign_active = 1;
 365                         }
 366                         /* ignore when signatures not wanted */
 367                 } else {
 368                         server->sign_active = 0;
 369                 }
 370                 return 0;
 371
 372         case NCP_IOC_SIGN_WANTED:
 373                 if ((file_permission(filp, MAY_READ) != 0)
 374                     && (current->uid != server->m.mounted_uid))
 375                 {
 376                         return -EACCES;
 377                 }
 378
 379                 if (put_user(server->sign_wanted, (int __user *)argp))
 380                         return -EFAULT;
 381                 return 0;
 382         case NCP_IOC_SET_SIGN_WANTED:
 383                 {
 384                         int newstate;
 385
 386                         if ((file_permission(filp, MAY_WRITE) != 0)
 387                             && (current->uid != server->m.mounted_uid))
 388                         {
 389                                 return -EACCES;
 390                         }
 391                         /* get only low 8 bits... */
 392                         if (get_user(newstate, (unsigned char __user *)argp))
 393                                 return -EFAULT;
 394                         if (server->sign_active) {
 395                                 /* cannot turn signatures OFF when active */
 396                                 if (!newstate) return -EINVAL;
 397                         } else {
 398                                 server->sign_wanted = newstate != 0;
 399                         }
 400                         return 0;
 401                 }
 402
 403 #endif /* CONFIG_NCPFS_PACKET_SIGNING */
 404
 405 #ifdef CONFIG_NCPFS_IOCTL_LOCKING
 406         case NCP_IOC_LOCKUNLOCK:
 407                 if ((file_permission(filp, MAY_WRITE) != 0)
 408                     && (current->uid != server->m.mounted_uid))
 409                 {
 410                         return -EACCES;
 411                 }
 412                 {
 413                         struct ncp_lock_ioctl    rqdata;
 414                         int result;
 415
 416                         if (copy_from_user(&rqdata, argp, sizeof(rqdata)))
 417                                 return -EFAULT;
 418                         if (rqdata.origin != 0)
 419                                 return -EINVAL;
 420                         /* check for cmd */
 421                         switch (rqdata.cmd) {
 422                                 case NCP_LOCK_EX:
 423                                 case NCP_LOCK_SH:
 424                                                 if (rqdata.timeout == 0)
 425                                                         rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
 426                                                 else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
 427                                                         rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
 428                                                 break;
 429                                 case NCP_LOCK_LOG:
 430                                                 rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;      /* has no effect */
 431                                 case NCP_LOCK_CLEAR:
 432                                                 break;
 433                                 default:
 434                                                 return -EINVAL;
 435                         }
 436                         /* locking needs both read and write access */
 437                         if ((result = ncp_make_open(inode, O_RDWR)) != 0)
 438                         {
 439                                 return result;
 440                         }
 441                         result = -EIO;
 442                         if (!ncp_conn_valid(server))
 443                                 goto outrel;
 444                         result = -EISDIR;
 445                         if (!S_ISREG(inode->i_mode))
 446                                 goto outrel;
 447                         if (rqdata.cmd == NCP_LOCK_CLEAR)
 448                         {
 449                                 result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
 450                                                         NCP_FINFO(inode)->file_handle,
 451                                                         rqdata.offset,
 452                                                         rqdata.length);
 453                                 if (result > 0) result = 0;     /* no such lock */
 454                         }
 455                         else
 456                         {
 457                                 int lockcmd;
 458
 459                                 switch (rqdata.cmd)
 460                                 {
 461                                         case NCP_LOCK_EX:  lockcmd=1; break;
 462                                         case NCP_LOCK_SH:  lockcmd=3; break;
 463                                         default:           lockcmd=0; break;
 464                                 }
 465                                 result = ncp_LogPhysicalRecord(NCP_SERVER(inode),
 466                                                         NCP_FINFO(inode)->file_handle,
 467                                                         lockcmd,
 468                                                         rqdata.offset,
 469                                                         rqdata.length,
 470                                                         rqdata.timeout);
 471                                 if (result > 0) result = -EAGAIN;
 472                         }
 473 outrel:
 474                         ncp_inode_close(inode);
 475                         return result;
 476                 }
 477 #endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 478
 479         case NCP_IOC_GETOBJECTNAME:
 480                 if (current->uid != server->m.mounted_uid) {
 481                         return -EACCES;
 482                 }
 483                 {
 484                         struct ncp_objectname_ioctl user;
 485                         size_t outl;
 486
 487                         if (copy_from_user(&user, argp, sizeof(user)))
 488                                 return -EFAULT;
 489                         user.auth_type = server->auth.auth_type;
 490                         outl = user.object_name_len;
 491                         user.object_name_len = server->auth.object_name_len;
 492                         if (outl > user.object_name_len)
 493                                 outl = user.object_name_len;
 494                         if (outl) {
 495                                 if (copy_to_user(user.object_name,
 496                                                  server->auth.object_name,
 497                                                  outl)) return -EFAULT;
 498                         }
 499                         if (copy_to_user(argp, &user, sizeof(user)))
 500                                 return -EFAULT;
 501                         return 0;
 502                 }
 503         case NCP_IOC_SETOBJECTNAME:
 504                 if (current->uid != server->m.mounted_uid) {
 505                         return -EACCES;
 506                 }
 507                 {
 508                         struct ncp_objectname_ioctl user;
 509                         void* newname;
 510                         void* oldname;
 511                         size_t oldnamelen;
 512                         void* oldprivate;
 513                         size_t oldprivatelen;
 514
 515                         if (copy_from_user(&user, argp, sizeof(user)))
 516                                 return -EFAULT;
 517                         if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
 518                                 return -ENOMEM;
 519                         if (user.object_name_len) {
 520                                 newname = kmalloc(user.object_name_len, GFP_USER);
 521                                 if (!newname)
 522                                         return -ENOMEM;
 523                                 if (copy_from_user(newname, user.object_name, user.object_name_len)) {
 524                                         kfree(newname);
 525                                         return -EFAULT;
 526                                 }
 527                         } else {
 528                                 newname = NULL;
 529                         }
 530                         /* enter critical section */
 531                         /* maybe that kfree can sleep so do that this way */
 532                         /* it is at least more SMP friendly (in future...) */
 533                         oldname = server->auth.object_name;
 534                         oldnamelen = server->auth.object_name_len;
 535                         oldprivate = server->priv.data;
 536                         oldprivatelen = server->priv.len;
 537                         server->auth.auth_type = user.auth_type;
 538                         server->auth.object_name_len = user.object_name_len;
 539                         server->auth.object_name = newname;
 540                         server->priv.len = 0;
 541                         server->priv.data = NULL;
 542                         /* leave critical section */
 543                         kfree(oldprivate);
 544                         kfree(oldname);
 545                         return 0;
 546                 }
 547         case NCP_IOC_GETPRIVATEDATA:
 548                 if (current->uid != server->m.mounted_uid) {
 549                         return -EACCES;
 550                 }
 551                 {
 552                         struct ncp_privatedata_ioctl user;
 553                         size_t outl;
 554
 555                         if (copy_from_user(&user, argp, sizeof(user)))
 556                                 return -EFAULT;
 557                         outl = user.len;
 558                         user.len = server->priv.len;
 559                         if (outl > user.len) outl = user.len;
 560                         if (outl) {
 561                                 if (copy_to_user(user.data,
 562                                                  server->priv.data,
 563                                                  outl)) return -EFAULT;
 564                         }
 565                         if (copy_to_user(argp, &user, sizeof(user)))
 566                                 return -EFAULT;
 567                         return 0;
 568                 }
 569         case NCP_IOC_SETPRIVATEDATA:
 570                 if (current->uid != server->m.mounted_uid) {
 571                         return -EACCES;
 572                 }
 573                 {
 574                         struct ncp_privatedata_ioctl user;
 575                         void* new;
 576                         void* old;
 577                         size_t oldlen;
 578
 579                         if (copy_from_user(&user, argp, sizeof(user)))
 580                                 return -EFAULT;
 581                         if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
 582                                 return -ENOMEM;
 583                         if (user.len) {
 584                                 new = kmalloc(user.len, GFP_USER);
 585                                 if (!new)
 586                                         return -ENOMEM;
 587                                 if (copy_from_user(new, user.data, user.len)) {
 588                                         kfree(new);
 589                                         return -EFAULT;
 590                                 }
 591                         } else {
 592                                 new = NULL;
 593                         }
 594                         /* enter critical section */
 595                         old = server->priv.data;
 596                         oldlen = server->priv.len;
 597                         server->priv.len = user.len;
 598                         server->priv.data = new;
 599                         /* leave critical section */
 600                         kfree(old);
 601                         return 0;
 602                 }
 603
 604 #ifdef CONFIG_NCPFS_NLS
 605         case NCP_IOC_SETCHARSETS:
 606                 return ncp_set_charsets(server, argp);
 607
 608         case NCP_IOC_GETCHARSETS:
 609                 return ncp_get_charsets(server, argp);
 610
 611 #endif /* CONFIG_NCPFS_NLS */
 612
 613         case NCP_IOC_SETDENTRYTTL:
 614                 if ((file_permission(filp, MAY_WRITE) != 0) &&
 615                                  (current->uid != server->m.mounted_uid))
 616                         return -EACCES;
 617                 {
 618                         u_int32_t user;
 619
 620                         if (copy_from_user(&user, argp, sizeof(user)))
 621                                 return -EFAULT;
 622                         /* 20 secs at most... */
 623                         if (user > 20000)
 624                                 return -EINVAL;
 625                         user = (user * HZ) / 1000;
 626                         server->dentry_ttl = user;
 627                         return 0;
 628                 }
 629
 630         case NCP_IOC_GETDENTRYTTL:
 631                 {
 632                         u_int32_t user = (server->dentry_ttl * 1000) / HZ;
 633                         if (copy_to_user(argp, &user, sizeof(user)))
 634                                 return -EFAULT;
 635                         return 0;
 636                 }
 637
 638         }
 639 /* #ifdef CONFIG_UID16 */
 640         /* NCP_IOC_GETMOUNTUID may be same as NCP_IOC_GETMOUNTUID2,
 641            so we have this out of switch */
 642         if (cmd == NCP_IOC_GETMOUNTUID) {
 643                 __kernel_uid_t uid = 0;
 644                 if ((file_permission(filp, MAY_READ) != 0)
 645                     && (current->uid != server->m.mounted_uid)) {
 646                         return -EACCES;
 647                 }
 648                 SET_UID(uid, server->m.mounted_uid);
 649                 if (put_user(uid, (__kernel_uid_t __user *)argp))
 650                         return -EFAULT;
 651                 return 0;
 652         }
 653 /* #endif */
 654         return -EINVAL;
 655 }