fs/cifs/misc.c

   1 /*
   2  *   fs/cifs/misc.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2004
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   This library is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU Lesser General Public License as published
   9  *   by the Free Software Foundation; either version 2.1 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This library is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  15  *   the GNU Lesser General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU Lesser General Public License
  18  *   along with this library; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  20  */
  21
  22 #include <linux/slab.h>
  23 #include <linux/ctype.h>
  24 #include <linux/mempool.h>
  25 #include "cifspdu.h"
  26 #include "cifsglob.h"
  27 #include "cifsproto.h"
  28 #include "cifs_debug.h"
  29 #include "smberr.h"
  30 #include "nterr.h"
  31 #include "cifs_unicode.h"
  32
  33 extern mempool_t *cifs_sm_req_poolp;
  34 extern mempool_t *cifs_req_poolp;
  35 extern struct task_struct * oplockThread;
  36
  37 static __u16 GlobalMid;         /* multiplex id - rotating counter */
  38
  39 /* The xid serves as a useful identifier for each incoming vfs request,
  40    in a similar way to the mid which is useful to track each sent smb,
  41    and CurrentXid can also provide a running counter (although it
  42    will eventually wrap past zero) of the total vfs operations handled
  43    since the cifs fs was mounted */
  44
  45 unsigned int
  46 _GetXid(void)
  47 {
  48         unsigned int xid;
  49
  50         spin_lock(&GlobalMid_Lock);
  51         GlobalTotalActiveXid++;
  52         if (GlobalTotalActiveXid > GlobalMaxActiveXid)
  53                 GlobalMaxActiveXid = GlobalTotalActiveXid;      /* keep high water mark for number of simultaneous vfs ops in our filesystem */
  54         xid = GlobalCurrentXid++;
  55         spin_unlock(&GlobalMid_Lock);
  56         return xid;
  57 }
  58
  59 void
  60 _FreeXid(unsigned int xid)
  61 {
  62         spin_lock(&GlobalMid_Lock);
  63         /* if(GlobalTotalActiveXid == 0)
  64                 BUG(); */
  65         GlobalTotalActiveXid--;
  66         spin_unlock(&GlobalMid_Lock);
  67 }
  68
  69 struct cifsSesInfo *
  70 sesInfoAlloc(void)
  71 {
  72         struct cifsSesInfo *ret_buf;
  73
  74         ret_buf =
  75             (struct cifsSesInfo *) kmalloc(sizeof (struct cifsSesInfo),
  76                                            GFP_KERNEL);
  77         if (ret_buf) {
  78                 memset(ret_buf, 0, sizeof (struct cifsSesInfo));
  79                 write_lock(&GlobalSMBSeslock);
  80                 atomic_inc(&sesInfoAllocCount);
  81                 ret_buf->status = CifsNew;
  82                 list_add(&ret_buf->cifsSessionList, &GlobalSMBSessionList);
  83                 init_MUTEX(&ret_buf->sesSem);
  84                 write_unlock(&GlobalSMBSeslock);
  85         }
  86         return ret_buf;
  87 }
  88
  89 void
  90 sesInfoFree(struct cifsSesInfo *buf_to_free)
  91 {
  92         if (buf_to_free == NULL) {
  93                 cFYI(1, ("Null buffer passed to sesInfoFree"));
  94                 return;
  95         }
  96
  97         write_lock(&GlobalSMBSeslock);
  98         atomic_dec(&sesInfoAllocCount);
  99         list_del(&buf_to_free->cifsSessionList);
 100         write_unlock(&GlobalSMBSeslock);
 101         if (buf_to_free->serverOS)
 102                 kfree(buf_to_free->serverOS);
 103         if (buf_to_free->serverDomain)
 104                 kfree(buf_to_free->serverDomain);
 105         if (buf_to_free->serverNOS)
 106                 kfree(buf_to_free->serverNOS);
 107         if (buf_to_free->password)
 108                 kfree(buf_to_free->password);
 109         kfree(buf_to_free);
 110 }
 111
 112 struct cifsTconInfo *
 113 tconInfoAlloc(void)
 114 {
 115         struct cifsTconInfo *ret_buf;
 116         ret_buf =
 117             (struct cifsTconInfo *) kmalloc(sizeof (struct cifsTconInfo),
 118                                             GFP_KERNEL);
 119         if (ret_buf) {
 120                 memset(ret_buf, 0, sizeof (struct cifsTconInfo));
 121                 write_lock(&GlobalSMBSeslock);
 122                 atomic_inc(&tconInfoAllocCount);
 123                 list_add(&ret_buf->cifsConnectionList,
 124                          &GlobalTreeConnectionList);
 125                 ret_buf->tidStatus = CifsNew;
 126                 INIT_LIST_HEAD(&ret_buf->openFileList);
 127                 init_MUTEX(&ret_buf->tconSem);
 128 #ifdef CONFIG_CIFS_STATS
 129                 spin_lock_init(&ret_buf->stat_lock);
 130 #endif
 131                 write_unlock(&GlobalSMBSeslock);
 132         }
 133         return ret_buf;
 134 }
 135
 136 void
 137 tconInfoFree(struct cifsTconInfo *buf_to_free)
 138 {
 139         if (buf_to_free == NULL) {
 140                 cFYI(1, ("Null buffer passed to tconInfoFree"));
 141                 return;
 142         }
 143         write_lock(&GlobalSMBSeslock);
 144         atomic_dec(&tconInfoAllocCount);
 145         list_del(&buf_to_free->cifsConnectionList);
 146         write_unlock(&GlobalSMBSeslock);
 147         if (buf_to_free->nativeFileSystem)
 148                 kfree(buf_to_free->nativeFileSystem);
 149         kfree(buf_to_free);
 150 }
 151
 152 struct smb_hdr *
 153 cifs_buf_get(void)
 154 {
 155         struct smb_hdr *ret_buf = NULL;
 156
 157 /* We could use negotiated size instead of max_msgsize -
 158    but it may be more efficient to always alloc same size
 159    albeit slightly larger than necessary and maxbuffersize
 160    defaults to this and can not be bigger */
 161         ret_buf =
 162             (struct smb_hdr *) mempool_alloc(cifs_req_poolp, SLAB_KERNEL | SLAB_NOFS);
 163
 164         /* clear the first few header bytes */
 165         /* for most paths, more is cleared in header_assemble */
 166         if (ret_buf) {
 167                 memset(ret_buf, 0, sizeof(struct smb_hdr) + 3);
 168                 atomic_inc(&bufAllocCount);
 169         }
 170
 171         return ret_buf;
 172 }
 173
 174 void
 175 cifs_buf_release(void *buf_to_free)
 176 {
 177
 178         if (buf_to_free == NULL) {
 179                 /* cFYI(1, ("Null buffer passed to cifs_buf_release"));*/
 180                 return;
 181         }
 182         mempool_free(buf_to_free,cifs_req_poolp);
 183
 184         atomic_dec(&bufAllocCount);
 185         return;
 186 }
 187
 188 struct smb_hdr *
 189 cifs_small_buf_get(void)
 190 {
 191         struct smb_hdr *ret_buf = NULL;
 192
 193 /* We could use negotiated size instead of max_msgsize -
 194    but it may be more efficient to always alloc same size
 195    albeit slightly larger than necessary and maxbuffersize
 196    defaults to this and can not be bigger */
 197         ret_buf =
 198             (struct smb_hdr *) mempool_alloc(cifs_sm_req_poolp, SLAB_KERNEL | SLAB_NOFS);
 199         if (ret_buf) {
 200         /* No need to clear memory here, cleared in header assemble */
 201         /*      memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/
 202                 atomic_inc(&smBufAllocCount);
 203         }
 204         return ret_buf;
 205 }
 206
 207 void
 208 cifs_small_buf_release(void *buf_to_free)
 209 {
 210
 211         if (buf_to_free == NULL) {
 212                 cFYI(1, ("Null buffer passed to cifs_small_buf_release"));
 213                 return;
 214         }
 215         mempool_free(buf_to_free,cifs_sm_req_poolp);
 216
 217         atomic_dec(&smBufAllocCount);
 218         return;
 219 }
 220
 221 void
 222 header_assemble(struct smb_hdr *buffer, char smb_command /* command */ ,
 223                 const struct cifsTconInfo *treeCon, int word_count
 224                 /* length of fixed section (word count) in two byte units  */)
 225 {
 226         struct list_head* temp_item;
 227         struct cifsSesInfo * ses;
 228         char *temp = (char *) buffer;
 229
 230         memset(temp,0,MAX_CIFS_HDR_SIZE);
 231
 232         buffer->smb_buf_length =
 233             (2 * word_count) + sizeof (struct smb_hdr) -
 234             4 /*  RFC 1001 length field does not count */  +
 235             2 /* for bcc field itself */ ;
 236         /* Note that this is the only network field that has to be converted to big endian and it is done just before we send it */
 237
 238         buffer->Protocol[0] = 0xFF;
 239         buffer->Protocol[1] = 'S';
 240         buffer->Protocol[2] = 'M';
 241         buffer->Protocol[3] = 'B';
 242         buffer->Command = smb_command;
 243         buffer->Flags = 0x00;   /* case sensitive */
 244         buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES;
 245         buffer->Pid = cpu_to_le16((__u16)current->tgid);
 246         buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16));
 247         spin_lock(&GlobalMid_Lock);
 248         GlobalMid++;
 249         buffer->Mid = GlobalMid;
 250         spin_unlock(&GlobalMid_Lock);
 251         if (treeCon) {
 252                 buffer->Tid = treeCon->tid;
 253                 if (treeCon->ses) {
 254                         if (treeCon->ses->capabilities & CAP_UNICODE)
 255                                 buffer->Flags2 |= SMBFLG2_UNICODE;
 256                         if (treeCon->ses->capabilities & CAP_STATUS32) {
 257                                 buffer->Flags2 |= SMBFLG2_ERR_STATUS;
 258                         }
 259
 260                         buffer->Uid = treeCon->ses->Suid;       /* always in LE format */
 261                         if(multiuser_mount != 0) {
 262                 /* For the multiuser case, there are few obvious technically  */
 263                 /* possible mechanisms to match the local linux user (uid)    */
 264                 /* to a valid remote smb user (smb_uid):                      */
 265                 /*      1) Query Winbind (or other local pam/nss daemon       */
 266                 /*        for userid/password/logon_domain or credential      */
 267                 /*      2) Query Winbind for uid to sid to username mapping   */
 268                 /*         and see if we have a matching password for existing*/
 269                 /*         session for that user perhas getting password by   */
 270                 /*         adding a new pam_cifs module that stores passwords */
 271                 /*         so that the cifs vfs can get at that for all logged*/
 272                 /*         on users                                           */
 273                 /*      3) (Which is the mechanism we have chosen)            */
 274                 /*         Search through sessions to the same server for a   */
 275                 /*         a match on the uid that was passed in on mount     */
 276                 /*         with the current processes uid (or euid?) and use  */
 277                 /*         that smb uid.   If no existing smb session for     */
 278                 /*         that uid found, use the default smb session ie     */
 279                 /*         the smb session for the volume mounted which is    */
 280                 /*         the same as would be used if the multiuser mount   */
 281                 /*         flag were disabled.  */
 282
 283                 /*  BB Add support for establishing new tCon and SMB Session  */
 284                 /*      with userid/password pairs found on the smb session   */
 285                 /*      for other target tcp/ip addresses               BB    */
 286                                 if(current->uid != treeCon->ses->linux_uid) {
 287                                         cFYI(1,("Multiuser mode and UID did not match tcon uid "));
 288                                         read_lock(&GlobalSMBSeslock);
 289                                         list_for_each(temp_item, &GlobalSMBSessionList) {
 290                                                 ses = list_entry(temp_item, struct cifsSesInfo, cifsSessionList);
 291                                                 if(ses->linux_uid == current->uid) {
 292                                                         if(ses->server == treeCon->ses->server) {
 293                                                                 cFYI(1,("found matching uid substitute right smb_uid"));
 294                                                                 buffer->Uid = ses->Suid;
 295                                                                 break;
 296                                                         } else {
 297                                                                 /* BB eventually call cifs_setup_session here */
 298                                                                 cFYI(1,("local UID found but smb sess with this server does not exist"));
 299                                                         }
 300                                                 }
 301                                         }
 302                                         read_unlock(&GlobalSMBSeslock);
 303                                 }
 304                         }
 305                 }
 306                 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS)
 307                         buffer->Flags2 |= SMBFLG2_DFS;
 308                 if((treeCon->ses) && (treeCon->ses->server))
 309                         if(treeCon->ses->server->secMode &
 310                           (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
 311                                 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
 312         }
 313
 314 /*  endian conversion of flags is now done just before sending */
 315         buffer->WordCount = (char) word_count;
 316         return;
 317 }
 318
 319 int
 320 checkSMBhdr(struct smb_hdr *smb, __u16 mid)
 321 {
 322         /* Make sure that this really is an SMB, that it is a response,
 323            and that the message ids match */
 324         if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) &&
 325                 (mid == smb->Mid)) {
 326                 if(smb->Flags & SMBFLG_RESPONSE)
 327                         return 0;
 328                 else {
 329                 /* only one valid case where server sends us request */
 330                         if(smb->Command == SMB_COM_LOCKING_ANDX)
 331                                 return 0;
 332                         else
 333                                 cERROR(1, ("Rcvd Request not response "));
 334                 }
 335         } else { /* bad signature or mid */
 336                 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff))
 337                         cERROR(1,
 338                                ("Bad protocol string signature header %x ",
 339                                 *(unsigned int *) smb->Protocol));
 340                 if (mid != smb->Mid)
 341                         cERROR(1, ("Mids do not match"));
 342         }
 343         cERROR(1, ("bad smb detected. The Mid=%d", smb->Mid));
 344         return 1;
 345 }
 346
 347 int
 348 checkSMB(struct smb_hdr *smb, __u16 mid, int length)
 349 {
 350         __u32 len = be32_to_cpu(smb->smb_buf_length);
 351         cFYI(0,
 352              ("Entering checkSMB with Length: %x, smb_buf_length: %x ",
 353               length, len));
 354         if (((unsigned int)length < 2 + sizeof (struct smb_hdr)) ||
 355             (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)) {
 356                 if ((unsigned int)length < 2 + sizeof (struct smb_hdr)) {
 357                         if (((unsigned int)length >=
 358                                 sizeof (struct smb_hdr) - 1)
 359                             && (smb->Status.CifsError != 0)) {
 360                                 smb->WordCount = 0;
 361                                 return 0;       /* some error cases do not return wct and bcc */
 362                         } else {
 363                                 cERROR(1, ("Length less than smb header size"));
 364                         }
 365
 366                 }
 367                 if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4)
 368                         cERROR(1,
 369                                ("smb_buf_length greater than MaxBufSize"));
 370                 cERROR(1,
 371                        ("bad smb detected. Illegal length. The mid=%d",
 372                         smb->Mid));
 373                 return 1;
 374         }
 375
 376         if (checkSMBhdr(smb, mid))
 377                 return 1;
 378
 379         if ((4 + len != smbCalcSize(smb))
 380             || (4 + len != (unsigned int)length)) {
 381                 return 0;
 382         } else {
 383                 cERROR(1, ("smbCalcSize %x ", smbCalcSize(smb)));
 384                 cERROR(1,
 385                        ("bad smb size detected. The Mid=%d", smb->Mid));
 386                 return 1;
 387         }
 388 }
 389 int
 390 is_valid_oplock_break(struct smb_hdr *buf)
 391 {
 392         struct smb_com_lock_req * pSMB = (struct smb_com_lock_req *)buf;
 393         struct list_head *tmp;
 394         struct list_head *tmp1;
 395         struct cifsTconInfo *tcon;
 396         struct cifsFileInfo *netfile;
 397
 398         cFYI(1,("Checking for oplock break or dnotify response"));
 399         if((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) &&
 400            (pSMB->hdr.Flags & SMBFLG_RESPONSE)) {
 401                 struct smb_com_transaction_change_notify_rsp * pSMBr =
 402                         (struct smb_com_transaction_change_notify_rsp *)buf;
 403                 struct file_notify_information * pnotify;
 404                 __u32 data_offset = 0;
 405                 if(pSMBr->ByteCount > sizeof(struct file_notify_information)) {
 406                         data_offset = le32_to_cpu(pSMBr->DataOffset);
 407
 408                         pnotify = (struct file_notify_information *)((char *)&pSMBr->hdr.Protocol
 409                                 + data_offset);
 410                         cFYI(1,("dnotify on %s with action: 0x%x",pnotify->FileName,
 411                                 pnotify->Action));  /* BB removeme BB */
 412                      /*   cifs_dump_mem("Received notify Data is: ",buf,sizeof(struct smb_hdr)+60); */
 413                         return TRUE;
 414                 }
 415                 if(pSMBr->hdr.Status.CifsError) {
 416                         cFYI(1,("notify err 0x%d",pSMBr->hdr.Status.CifsError));
 417                         return TRUE;
 418                 }
 419                 return FALSE;
 420         }
 421         if(pSMB->hdr.Command != SMB_COM_LOCKING_ANDX)
 422                 return FALSE;
 423         if(pSMB->hdr.Flags & SMBFLG_RESPONSE) {
 424                 /* no sense logging error on invalid handle on oplock
 425                    break - harmless race between close request and oplock
 426                    break response is expected from time to time writing out
 427                    large dirty files cached on the client */
 428                 if ((NT_STATUS_INVALID_HANDLE) ==
 429                    le32_to_cpu(pSMB->hdr.Status.CifsError)) {
 430                         cFYI(1,("invalid handle on oplock break"));
 431                         return TRUE;
 432                 } else if (ERRbadfid ==
 433                    le16_to_cpu(pSMB->hdr.Status.DosError.Error)) {
 434                         return TRUE;
 435                 } else {
 436                         return FALSE; /* on valid oplock brk we get "request" */
 437                 }
 438         }
 439         if(pSMB->hdr.WordCount != 8)
 440                 return FALSE;
 441
 442         cFYI(1,(" oplock type 0x%d level 0x%d",pSMB->LockType,pSMB->OplockLevel));
 443         if(!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE))
 444                 return FALSE;
 445
 446         /* look up tcon based on tid & uid */
 447         read_lock(&GlobalSMBSeslock);
 448         list_for_each(tmp, &GlobalTreeConnectionList) {
 449                 tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
 450                 if (tcon->tid == buf->Tid) {
 451 #ifdef CONFIG_CIFS_STATS
 452                         atomic_inc(&tcon->num_oplock_brks);
 453 #endif
 454                         list_for_each(tmp1,&tcon->openFileList){
 455                                 netfile = list_entry(tmp1,struct cifsFileInfo,
 456                                                      tlist);
 457                                 if(pSMB->Fid == netfile->netfid) {
 458                                         struct cifsInodeInfo *pCifsInode;
 459                                         read_unlock(&GlobalSMBSeslock);
 460                                         cFYI(1,("file id match, oplock break"));
 461                                         pCifsInode =
 462                                                 CIFS_I(netfile->pInode);
 463                                         pCifsInode->clientCanCacheAll = FALSE;
 464                                         if(pSMB->OplockLevel == 0)
 465                                                 pCifsInode->clientCanCacheRead
 466                                                         = FALSE;
 467                                         pCifsInode->oplockPending = TRUE;
 468                                         AllocOplockQEntry(netfile->pInode,
 469                                                           netfile->netfid,
 470                                                           tcon);
 471                                         cFYI(1,("about to wake up oplock thd"));
 472                                         if(oplockThread)
 473                                             wake_up_process(oplockThread);
 474                                         return TRUE;
 475                                 }
 476                         }
 477                         read_unlock(&GlobalSMBSeslock);
 478                         cFYI(1,("No matching file for oplock break"));
 479                         return TRUE;
 480                 }
 481         }
 482         read_unlock(&GlobalSMBSeslock);
 483         cFYI(1,("Can not process oplock break for non-existent connection"));
 484         return TRUE;
 485 }
 486
 487 void
 488 dump_smb(struct smb_hdr *smb_buf, int smb_buf_length)
 489 {
 490         int i, j;
 491         char debug_line[17];
 492         unsigned char *buffer;
 493
 494         if (traceSMB == 0)
 495                 return;
 496
 497         buffer = (unsigned char *) smb_buf;
 498         for (i = 0, j = 0; i < smb_buf_length; i++, j++) {
 499                 if (i % 8 == 0) {       /* have reached the beginning of line */
 500                         printk(KERN_DEBUG "| ");
 501                         j = 0;
 502                 }
 503                 printk("%0#4x ", buffer[i]);
 504                 debug_line[2 * j] = ' ';
 505                 if (isprint(buffer[i]))
 506                         debug_line[1 + (2 * j)] = buffer[i];
 507                 else
 508                         debug_line[1 + (2 * j)] = '_';
 509
 510                 if (i % 8 == 7) { /* reached end of line, time to print ascii */
 511                         debug_line[16] = 0;
 512                         printk(" | %s\n", debug_line);
 513                 }
 514         }
 515         for (; j < 8; j++) {
 516                 printk("     ");
 517                 debug_line[2 * j] = ' ';
 518                 debug_line[1 + (2 * j)] = ' ';
 519         }
 520         printk( " | %s\n", debug_line);
 521         return;
 522 }
 523
 524 /* Windows maps these to the user defined 16 bit Unicode range since they are
 525    reserved symbols (along with \ and /), otherwise illegal to store
 526    in filenames in NTFS */
 527 #define UNI_ASTERIK     (__u16) ('*' + 0xF000)
 528 #define UNI_QUESTION    (__u16) ('?' + 0xF000)
 529 #define UNI_COLON       (__u16) (':' + 0xF000)
 530 #define UNI_GRTRTHAN    (__u16) ('>' + 0xF000)
 531 #define UNI_LESSTHAN    (__u16) ('<' + 0xF000)
 532 #define UNI_PIPE        (__u16) ('|' + 0xF000)
 533 #define UNI_SLASH       (__u16) ('\\' + 0xF000)
 534
 535 /* Convert 16 bit Unicode pathname from wire format to string in current code
 536    page.  Conversion may involve remapping up the seven characters that are
 537    only legal in POSIX-like OS (if they are present in the string). Path
 538    names are little endian 16 bit Unicode on the wire */
 539 int
 540 cifs_convertUCSpath(char *target, const __le16 * source, int maxlen,
 541                     const struct nls_table * cp)
 542 {
 543         int i,j,len;
 544         __u16 src_char;
 545
 546         for(i = 0, j = 0; i < maxlen; i++) {
 547                 src_char = le16_to_cpu(source[i]);
 548                 switch (src_char) {
 549                         case 0:
 550                                 goto cUCS_out; /* BB check this BB */
 551                         case UNI_COLON:
 552                                 target[j] = ':';
 553                                 break;
 554                         case UNI_ASTERIK:
 555                                 target[j] = '*';
 556                                 break;
 557                         case UNI_QUESTION:
 558                                 target[j] = '?';
 559                                 break;
 560                         /* BB We can not handle remapping slash until
 561                            all the calls to build_path_from_dentry
 562                            are modified, as they use slash as separator BB */
 563                         /* case UNI_SLASH:
 564                                 target[j] = '\\';
 565                                 break;*/
 566                         case UNI_PIPE:
 567                                 target[j] = '|';
 568                                 break;
 569                         case UNI_GRTRTHAN:
 570                                 target[j] = '>';
 571                                 break;
 572                         case UNI_LESSTHAN:
 573                                 target[j] = '<';
 574                                 break;
 575                         default:
 576                                 len = cp->uni2char(src_char, &target[j],
 577                                                 NLS_MAX_CHARSET_SIZE);
 578                                 if(len > 0) {
 579                                         j += len;
 580                                         continue;
 581                                 } else {
 582                                         target[j] = '?';
 583                                 }
 584                 }
 585                 j++;
 586                 /* make sure we do not overrun callers allocated temp buffer */
 587                 if(j >= (2 * NAME_MAX))
 588                         break;
 589         }
 590 cUCS_out:
 591         target[j] = 0;
 592         return j;
 593 }
 594
 595 /* Convert 16 bit Unicode pathname to wire format from string in current code
 596    page.  Conversion may involve remapping up the seven characters that are
 597    only legal in POSIX-like OS (if they are present in the string). Path
 598    names are little endian 16 bit Unicode on the wire */
 599 int
 600 cifsConvertToUCS(__le16 * target, const char *source, int maxlen,
 601                  const struct nls_table * cp, int mapChars)
 602 {
 603         int i,j,charlen;
 604         int len_remaining = maxlen;
 605         char src_char;
 606
 607         if(!mapChars)
 608                 return cifs_strtoUCS((wchar_t *) target, source, PATH_MAX, cp);
 609
 610         for(i = 0, j = 0; i < maxlen; j++) {
 611                 src_char = source[i];
 612                 switch (src_char) {
 613                         case 0:
 614                                 goto ctoUCS_out;
 615                         case ':':
 616                                 target[j] = cpu_to_le16(UNI_COLON);
 617                                 break;
 618                         case '*':
 619                                 target[j] = cpu_to_le16(UNI_ASTERIK);
 620                                 break;
 621                         case '?':
 622                                 target[j] = cpu_to_le16(UNI_QUESTION);
 623                                 break;
 624                         case '<':
 625                                 target[j] = cpu_to_le16(UNI_LESSTHAN);
 626                                 break;
 627                         case '>':
 628                                 target[j] = cpu_to_le16(UNI_GRTRTHAN);
 629                                 break;
 630                         case '|':
 631                                 target[j] = cpu_to_le16(UNI_PIPE);
 632                                 break;
 633                         /* BB We can not handle remapping slash until
 634                            all the calls to build_path_from_dentry
 635                            are modified, as they use slash as separator BB */
 636                         /* case '\\':
 637                                 target[j] = cpu_to_le16(UNI_SLASH);
 638                                 break;*/
 639                         default:
 640                                 charlen = cp->char2uni(source+i,
 641                                         len_remaining, target+j);
 642                                 /* if no match, use question mark, which
 643                                 at least in some cases servers as wild card */
 644                                 if(charlen < 1) {
 645                                         target[j] = cpu_to_le16(0x003f);
 646                                         charlen = 1;
 647                                 }
 648                                 len_remaining -= charlen;
 649                                 /* character may take more than one byte in the
 650                                    the source string, but will take exactly two
 651                                    bytes in the target string */
 652                                 i+= charlen;
 653                                 continue;
 654                 }
 655                 i++; /* move to next char in source string */
 656                 len_remaining--;
 657         }
 658
 659 ctoUCS_out:
 660         return i;
 661 }