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