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 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, NULL) != 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, NULL) != 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                         SET_UID(info.mounted_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, NULL) != 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, NULL) != 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, NULL) != 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                         unsigned int vnum, de, dosde;
 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                                 vnum = NCP_NUMBER_OF_VOLUMES;
 218                                 de = 0;
 219                                 dosde = 0;
 220                         } else if (sr.volNumber >= NCP_NUMBER_OF_VOLUMES) {
 221                                 return -EINVAL;
 222                         } else {
 223                                 struct nw_info_struct ni;
 224
 225                                 if (ncp_mount_subdir(server, &ni, sr.volNumber,
 226                                                 sr.namespace, sr.dirEntNum))
 227                                         return -ENOENT;
 228                                 vnum = ni.volNumber;
 229                                 de = ni.dirEntNum;
 230                                 dosde = ni.DosDirNum;
 231                         }
 232
 233                         dentry = inode->i_sb->s_root;
 234                         server->root_setuped = 1;
 235                         if (dentry) {
 236                                 struct inode* inode = dentry->d_inode;
 237
 238                                 if (inode) {
 239                                         NCP_FINFO(inode)->volNumber = vnum;
 240                                         NCP_FINFO(inode)->dirEntNum = de;
 241                                         NCP_FINFO(inode)->DosDirNum = dosde;
 242                                 } else
 243                                         DPRINTK("ncpfs: s_root->d_inode==NULL\n");
 244                         } else
 245                                 DPRINTK("ncpfs: s_root==NULL\n");
 246
 247                         return 0;
 248                 }
 249
 250 #ifdef CONFIG_NCPFS_PACKET_SIGNING
 251         case NCP_IOC_SIGN_INIT:
 252                 if ((permission(inode, MAY_WRITE, NULL) != 0)
 253                     && (current->uid != server->m.mounted_uid))
 254                 {
 255                         return -EACCES;
 256                 }
 257                 if (arg) {
 258                         if (server->sign_wanted)
 259                         {
 260                                 struct ncp_sign_init sign;
 261
 262                                 if (copy_from_user(&sign, (struct ncp_sign_init *) arg,
 263                                       sizeof(sign))) return -EFAULT;
 264                                 memcpy(server->sign_root,sign.sign_root,8);
 265                                 memcpy(server->sign_last,sign.sign_last,16);
 266                                 server->sign_active = 1;
 267                         }
 268                         /* ignore when signatures not wanted */
 269                 } else {
 270                         server->sign_active = 0;
 271                 }
 272                 return 0;
 273
 274         case NCP_IOC_SIGN_WANTED:
 275                 if (   (permission(inode, MAY_READ, NULL) != 0)
 276                     && (current->uid != server->m.mounted_uid))
 277                 {
 278                         return -EACCES;
 279                 }
 280
 281                 if (put_user(server->sign_wanted, (int*) arg))
 282                         return -EFAULT;
 283                 return 0;
 284         case NCP_IOC_SET_SIGN_WANTED:
 285                 {
 286                         int newstate;
 287
 288                         if (   (permission(inode, MAY_WRITE, NULL) != 0)
 289                             && (current->uid != server->m.mounted_uid))
 290                         {
 291                                 return -EACCES;
 292                         }
 293                         /* get only low 8 bits... */
 294                         if (get_user(newstate, (unsigned char *) arg))
 295                                 return -EFAULT;
 296                         if (server->sign_active) {
 297                                 /* cannot turn signatures OFF when active */
 298                                 if (!newstate) return -EINVAL;
 299                         } else {
 300                                 server->sign_wanted = newstate != 0;
 301                         }
 302                         return 0;
 303                 }
 304
 305 #endif /* CONFIG_NCPFS_PACKET_SIGNING */
 306
 307 #ifdef CONFIG_NCPFS_IOCTL_LOCKING
 308         case NCP_IOC_LOCKUNLOCK:
 309                 if (   (permission(inode, MAY_WRITE, NULL) != 0)
 310                     && (current->uid != server->m.mounted_uid))
 311                 {
 312                         return -EACCES;
 313                 }
 314                 {
 315                         struct ncp_lock_ioctl    rqdata;
 316                         int result;
 317
 318                         if (copy_from_user(&rqdata, (struct ncp_lock_ioctl*)arg,
 319                                 sizeof(rqdata))) return -EFAULT;
 320                         if (rqdata.origin != 0)
 321                                 return -EINVAL;
 322                         /* check for cmd */
 323                         switch (rqdata.cmd) {
 324                                 case NCP_LOCK_EX:
 325                                 case NCP_LOCK_SH:
 326                                                 if (rqdata.timeout == 0)
 327                                                         rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;
 328                                                 else if (rqdata.timeout > NCP_LOCK_MAX_TIMEOUT)
 329                                                         rqdata.timeout = NCP_LOCK_MAX_TIMEOUT;
 330                                                 break;
 331                                 case NCP_LOCK_LOG:
 332                                                 rqdata.timeout = NCP_LOCK_DEFAULT_TIMEOUT;      /* has no effect */
 333                                 case NCP_LOCK_CLEAR:
 334                                                 break;
 335                                 default:
 336                                                 return -EINVAL;
 337                         }
 338                         /* locking needs both read and write access */
 339                         if ((result = ncp_make_open(inode, O_RDWR)) != 0)
 340                         {
 341                                 return result;
 342                         }
 343                         result = -EIO;
 344                         if (!ncp_conn_valid(server))
 345                                 goto outrel;
 346                         result = -EISDIR;
 347                         if (!S_ISREG(inode->i_mode))
 348                                 goto outrel;
 349                         if (rqdata.cmd == NCP_LOCK_CLEAR)
 350                         {
 351                                 result = ncp_ClearPhysicalRecord(NCP_SERVER(inode),
 352                                                         NCP_FINFO(inode)->file_handle,
 353                                                         rqdata.offset,
 354                                                         rqdata.length);
 355                                 if (result > 0) result = 0;     /* no such lock */
 356                         }
 357                         else
 358                         {
 359                                 int lockcmd;
 360
 361                                 switch (rqdata.cmd)
 362                                 {
 363                                         case NCP_LOCK_EX:  lockcmd=1; break;
 364                                         case NCP_LOCK_SH:  lockcmd=3; break;
 365                                         default:           lockcmd=0; break;
 366                                 }
 367                                 result = ncp_LogPhysicalRecord(NCP_SERVER(inode),
 368                                                         NCP_FINFO(inode)->file_handle,
 369                                                         lockcmd,
 370                                                         rqdata.offset,
 371                                                         rqdata.length,
 372                                                         rqdata.timeout);
 373                                 if (result > 0) result = -EAGAIN;
 374                         }
 375 outrel:
 376                         ncp_inode_close(inode);
 377                         return result;
 378                 }
 379 #endif  /* CONFIG_NCPFS_IOCTL_LOCKING */
 380
 381         case NCP_IOC_GETOBJECTNAME:
 382                 if (current->uid != server->m.mounted_uid) {
 383                         return -EACCES;
 384                 }
 385                 {
 386                         struct ncp_objectname_ioctl user;
 387                         size_t outl;
 388
 389                         if (copy_from_user(&user,
 390                                            (struct ncp_objectname_ioctl*)arg,
 391                                            sizeof(user))) return -EFAULT;
 392                         user.auth_type = server->auth.auth_type;
 393                         outl = user.object_name_len;
 394                         user.object_name_len = server->auth.object_name_len;
 395                         if (outl > user.object_name_len)
 396                                 outl = user.object_name_len;
 397                         if (outl) {
 398                                 if (copy_to_user(user.object_name,
 399                                                  server->auth.object_name,
 400                                                  outl)) return -EFAULT;
 401                         }
 402                         if (copy_to_user((struct ncp_objectname_ioctl*)arg,
 403                                          &user,
 404                                          sizeof(user))) return -EFAULT;
 405                         return 0;
 406                 }
 407         case NCP_IOC_SETOBJECTNAME:
 408                 if (current->uid != server->m.mounted_uid) {
 409                         return -EACCES;
 410                 }
 411                 {
 412                         struct ncp_objectname_ioctl user;
 413                         void* newname;
 414                         void* oldname;
 415                         size_t oldnamelen;
 416                         void* oldprivate;
 417                         size_t oldprivatelen;
 418
 419                         if (copy_from_user(&user,
 420                                            (struct ncp_objectname_ioctl*)arg,
 421                                            sizeof(user))) return -EFAULT;
 422                         if (user.object_name_len > NCP_OBJECT_NAME_MAX_LEN)
 423                                 return -ENOMEM;
 424                         if (user.object_name_len) {
 425                                 newname = ncp_kmalloc(user.object_name_len, GFP_USER);
 426                                 if (!newname) return -ENOMEM;
 427                                 if (copy_from_user(newname, user.object_name, user.object_name_len)) {
 428                                         ncp_kfree_s(newname, user.object_name_len);
 429                                         return -EFAULT;
 430                                 }
 431                         } else {
 432                                 newname = NULL;
 433                         }
 434                         /* enter critical section */
 435                         /* maybe that kfree can sleep so do that this way */
 436                         /* it is at least more SMP friendly (in future...) */
 437                         oldname = server->auth.object_name;
 438                         oldnamelen = server->auth.object_name_len;
 439                         oldprivate = server->priv.data;
 440                         oldprivatelen = server->priv.len;
 441                         server->auth.auth_type = user.auth_type;
 442                         server->auth.object_name_len = user.object_name_len;
 443                         server->auth.object_name = newname;
 444                         server->priv.len = 0;
 445                         server->priv.data = NULL;
 446                         /* leave critical section */
 447                         if (oldprivate) ncp_kfree_s(oldprivate, oldprivatelen);
 448                         if (oldname) ncp_kfree_s(oldname, oldnamelen);
 449                         return 0;
 450                 }
 451         case NCP_IOC_GETPRIVATEDATA:
 452                 if (current->uid != server->m.mounted_uid) {
 453                         return -EACCES;
 454                 }
 455                 {
 456                         struct ncp_privatedata_ioctl user;
 457                         size_t outl;
 458
 459                         if (copy_from_user(&user,
 460                                            (struct ncp_privatedata_ioctl*)arg,
 461                                            sizeof(user))) return -EFAULT;
 462                         outl = user.len;
 463                         user.len = server->priv.len;
 464                         if (outl > user.len) outl = user.len;
 465                         if (outl) {
 466                                 if (copy_to_user(user.data,
 467                                                  server->priv.data,
 468                                                  outl)) return -EFAULT;
 469                         }
 470                         if (copy_to_user((struct ncp_privatedata_ioctl*)arg,
 471                                          &user,
 472                                          sizeof(user))) return -EFAULT;
 473                         return 0;
 474                 }
 475         case NCP_IOC_SETPRIVATEDATA:
 476                 if (current->uid != server->m.mounted_uid) {
 477                         return -EACCES;
 478                 }
 479                 {
 480                         struct ncp_privatedata_ioctl user;
 481                         void* new;
 482                         void* old;
 483                         size_t oldlen;
 484
 485                         if (copy_from_user(&user,
 486                                            (struct ncp_privatedata_ioctl*)arg,
 487                                            sizeof(user))) return -EFAULT;
 488                         if (user.len > NCP_PRIVATE_DATA_MAX_LEN)
 489                                 return -ENOMEM;
 490                         if (user.len) {
 491                                 new = ncp_kmalloc(user.len, GFP_USER);
 492                                 if (!new) return -ENOMEM;
 493                                 if (copy_from_user(new, user.data, user.len)) {
 494                                         ncp_kfree_s(new, user.len);
 495                                         return -EFAULT;
 496                                 }
 497                         } else {
 498                                 new = NULL;
 499                         }
 500                         /* enter critical section */
 501                         old = server->priv.data;
 502                         oldlen = server->priv.len;
 503                         server->priv.len = user.len;
 504                         server->priv.data = new;
 505                         /* leave critical section */
 506                         if (old) ncp_kfree_s(old, oldlen);
 507                         return 0;
 508                 }
 509
 510 #ifdef CONFIG_NCPFS_NLS
 511 /* Here we are select the iocharset and the codepage for NLS.
 512  * Thanks Petr Vandrovec for idea and many hints.
 513  */
 514         case NCP_IOC_SETCHARSETS:
 515                 if (!capable(CAP_SYS_ADMIN))
 516                         return -EACCES;
 517                 if (server->root_setuped)
 518                         return -EBUSY;
 519
 520                 {
 521                         struct ncp_nls_ioctl user;
 522                         struct nls_table *codepage;
 523                         struct nls_table *iocharset;
 524                         struct nls_table *oldset_io;
 525                         struct nls_table *oldset_cp;
 526
 527                         if (copy_from_user(&user, (struct ncp_nls_ioctl*)arg,
 528                                         sizeof(user)))
 529                                 return -EFAULT;
 530
 531                         codepage = NULL;
 532                         user.codepage[NCP_IOCSNAME_LEN] = 0;
 533                         if (!user.codepage[0] ||
 534                                         !strcmp(user.codepage, "default"))
 535                                 codepage = load_nls_default();
 536                         else {
 537                                 codepage = load_nls(user.codepage);
 538                                 if (!codepage) {
 539                                         return -EBADRQC;
 540                                 }
 541                         }
 542
 543                         iocharset = NULL;
 544                         user.iocharset[NCP_IOCSNAME_LEN] = 0;
 545                         if (!user.iocharset[0] ||
 546                                         !strcmp(user.iocharset, "default")) {
 547                                 iocharset = load_nls_default();
 548                                 NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
 549                         } else {
 550                                 if (!strcmp(user.iocharset, "utf8")) {
 551                                         iocharset = load_nls_default();
 552                                         NCP_SET_FLAG(server, NCP_FLAG_UTF8);
 553                                 } else {
 554                                         iocharset = load_nls(user.iocharset);
 555                                         if (!iocharset) {
 556                                                 unload_nls(codepage);
 557                                                 return -EBADRQC;
 558                                         }
 559                                         NCP_CLR_FLAG(server, NCP_FLAG_UTF8);
 560                                 }
 561                         }
 562
 563                         oldset_cp = server->nls_vol;
 564                         server->nls_vol = codepage;
 565                         oldset_io = server->nls_io;
 566                         server->nls_io = iocharset;
 567
 568                         if (oldset_cp)
 569                                 unload_nls(oldset_cp);
 570                         if (oldset_io)
 571                                 unload_nls(oldset_io);
 572
 573                         return 0;
 574                 }
 575
 576         case NCP_IOC_GETCHARSETS: /* not tested */
 577                 {
 578                         struct ncp_nls_ioctl user;
 579                         int len;
 580
 581                         memset(&user, 0, sizeof(user));
 582                         if (server->nls_vol && server->nls_vol->charset) {
 583                                 len = strlen(server->nls_vol->charset);
 584                                 if (len > NCP_IOCSNAME_LEN)
 585                                         len = NCP_IOCSNAME_LEN;
 586                                 strncpy(user.codepage,
 587                                                 server->nls_vol->charset, len);
 588                                 user.codepage[len] = 0;
 589                         }
 590
 591                         if (NCP_IS_FLAG(server, NCP_FLAG_UTF8))
 592                                 strcpy(user.iocharset, "utf8");
 593                         else
 594                                 if (server->nls_io && server->nls_io->charset) {
 595                                         len = strlen(server->nls_io->charset);
 596                                         if (len > NCP_IOCSNAME_LEN)
 597                                                 len = NCP_IOCSNAME_LEN;
 598                                         strncpy(user.iocharset,
 599                                                 server->nls_io->charset, len);
 600                                         user.iocharset[len] = 0;
 601                                 }
 602
 603                         if (copy_to_user((struct ncp_nls_ioctl*)arg, &user,
 604                                         sizeof(user)))
 605                                 return -EFAULT;
 606
 607                         return 0;
 608                 }
 609 #endif /* CONFIG_NCPFS_NLS */
 610         case NCP_IOC_SETDENTRYTTL:
 611                 if ((permission(inode, MAY_WRITE, NULL) != 0) &&
 612                                  (current->uid != server->m.mounted_uid))
 613                         return -EACCES;
 614                 {
 615                         u_int32_t user;
 616
 617                         if (copy_from_user(&user, (u_int32_t*)arg, sizeof(user)))
 618                                 return -EFAULT;
 619                         /* 20 secs at most... */
 620                         if (user > 20000)
 621                                 return -EINVAL;
 622                         user = (user * HZ) / 1000;
 623                         server->dentry_ttl = user;
 624                         return 0;
 625                 }
 626
 627         case NCP_IOC_GETDENTRYTTL:
 628                 {
 629                         u_int32_t user = (server->dentry_ttl * 1000) / HZ;
 630                         if (copy_to_user((u_int32_t*)arg, &user, sizeof(user)))
 631                                 return -EFAULT;
 632                         return 0;
 633                 }
 634
 635         }
 636 /* #ifdef CONFIG_UID16 */
 637         /* NCP_IOC_GETMOUNTUID may be same as NCP_IOC_GETMOUNTUID2,
 638            so we have this out of switch */
 639         if (cmd == NCP_IOC_GETMOUNTUID) {
 640                 __kernel_uid_t uid = 0;
 641                 if ((permission(inode, MAY_READ, NULL) != 0)
 642                     && (current->uid != server->m.mounted_uid)) {
 643                         return -EACCES;
 644                 }
 645                 SET_UID(uid, server->m.mounted_uid);
 646                 if (put_user(uid, (__kernel_uid_t *) arg))
 647                         return -EFAULT;
 648                 return 0;
 649         }
 650 /* #endif */
 651         return -EINVAL;
 652 }