1/* 2 * fs/cifs/misc.c 3 * 4 * Copyright (C) International Business Machines Corp., 2002,2008 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 33extern mempool_t *cifs_sm_req_poolp; 34extern mempool_t *cifs_req_poolp; 35 36/* The xid serves as a useful identifier for each incoming vfs request, 37 in a similar way to the mid which is useful to track each sent smb, 38 and CurrentXid can also provide a running counter (although it 39 will eventually wrap past zero) of the total vfs operations handled 40 since the cifs fs was mounted */ 41 42unsigned int 43_GetXid(void) 44{ 45 unsigned int xid; 46 47 spin_lock(&GlobalMid_Lock); 48 GlobalTotalActiveXid++; 49 50 /* keep high water mark for number of simultaneous ops in filesystem */ 51 if (GlobalTotalActiveXid > GlobalMaxActiveXid) 52 GlobalMaxActiveXid = GlobalTotalActiveXid; 53 if (GlobalTotalActiveXid > 65000) 54 cFYI(1, "warning: more than 65000 requests active"); 55 xid = GlobalCurrentXid++; 56 spin_unlock(&GlobalMid_Lock); 57 return xid; 58} 59 60void 61_FreeXid(unsigned int xid) 62{ 63 spin_lock(&GlobalMid_Lock); 64 /* if (GlobalTotalActiveXid == 0) 65 BUG(); */ 66 GlobalTotalActiveXid--; 67 spin_unlock(&GlobalMid_Lock); 68} 69 70struct cifsSesInfo * 71sesInfoAlloc(void) 72{ 73 struct cifsSesInfo *ret_buf; 74 75 ret_buf = kzalloc(sizeof(struct cifsSesInfo), GFP_KERNEL); 76 if (ret_buf) { 77 atomic_inc(&sesInfoAllocCount); 78 ret_buf->status = CifsNew; 79 ++ret_buf->ses_count; 80 INIT_LIST_HEAD(&ret_buf->smb_ses_list); 81 INIT_LIST_HEAD(&ret_buf->tcon_list); 82 mutex_init(&ret_buf->session_mutex); 83 } 84 return ret_buf; 85} 86 87void 88sesInfoFree(struct cifsSesInfo *buf_to_free) 89{ 90 if (buf_to_free == NULL) { 91 cFYI(1, "Null buffer passed to sesInfoFree"); 92 return; 93 } 94 95 atomic_dec(&sesInfoAllocCount); 96 kfree(buf_to_free->serverOS); 97 kfree(buf_to_free->serverDomain); 98 kfree(buf_to_free->serverNOS); 99 if (buf_to_free->password) { 100 memset(buf_to_free->password, 0, strlen(buf_to_free->password)); 101 kfree(buf_to_free->password); 102 } 103 kfree(buf_to_free->domainName); 104 kfree(buf_to_free); 105} 106 107struct cifsTconInfo * 108tconInfoAlloc(void) 109{ 110 struct cifsTconInfo *ret_buf; 111 ret_buf = kzalloc(sizeof(struct cifsTconInfo), GFP_KERNEL); 112 if (ret_buf) { 113 atomic_inc(&tconInfoAllocCount); 114 ret_buf->tidStatus = CifsNew; 115 ++ret_buf->tc_count; 116 INIT_LIST_HEAD(&ret_buf->openFileList); 117 INIT_LIST_HEAD(&ret_buf->tcon_list); 118#ifdef CONFIG_CIFS_STATS 119 spin_lock_init(&ret_buf->stat_lock); 120#endif 121 } 122 return ret_buf; 123} 124 125void 126tconInfoFree(struct cifsTconInfo *buf_to_free) 127{ 128 if (buf_to_free == NULL) { 129 cFYI(1, "Null buffer passed to tconInfoFree"); 130 return; 131 } 132 atomic_dec(&tconInfoAllocCount); 133 kfree(buf_to_free->nativeFileSystem); 134 if (buf_to_free->password) { 135 memset(buf_to_free->password, 0, strlen(buf_to_free->password)); 136 kfree(buf_to_free->password); 137 } 138 kfree(buf_to_free); 139} 140 141struct smb_hdr * 142cifs_buf_get(void) 143{ 144 struct smb_hdr *ret_buf = NULL; 145 146/* We could use negotiated size instead of max_msgsize - 147 but it may be more efficient to always alloc same size 148 albeit slightly larger than necessary and maxbuffersize 149 defaults to this and can not be bigger */ 150 ret_buf = mempool_alloc(cifs_req_poolp, GFP_NOFS); 151 152 /* clear the first few header bytes */ 153 /* for most paths, more is cleared in header_assemble */ 154 if (ret_buf) { 155 memset(ret_buf, 0, sizeof(struct smb_hdr) + 3); 156 atomic_inc(&bufAllocCount); 157#ifdef CONFIG_CIFS_STATS2 158 atomic_inc(&totBufAllocCount); 159#endif /* CONFIG_CIFS_STATS2 */ 160 } 161 162 return ret_buf; 163} 164 165void 166cifs_buf_release(void *buf_to_free) 167{ 168 if (buf_to_free == NULL) { 169 /* cFYI(1, "Null buffer passed to cifs_buf_release");*/ 170 return; 171 } 172 mempool_free(buf_to_free, cifs_req_poolp); 173 174 atomic_dec(&bufAllocCount); 175 return; 176} 177 178struct smb_hdr * 179cifs_small_buf_get(void) 180{ 181 struct smb_hdr *ret_buf = NULL; 182 183/* We could use negotiated size instead of max_msgsize - 184 but it may be more efficient to always alloc same size 185 albeit slightly larger than necessary and maxbuffersize 186 defaults to this and can not be bigger */ 187 ret_buf = mempool_alloc(cifs_sm_req_poolp, GFP_NOFS); 188 if (ret_buf) { 189 /* No need to clear memory here, cleared in header assemble */ 190 /* memset(ret_buf, 0, sizeof(struct smb_hdr) + 27);*/ 191 atomic_inc(&smBufAllocCount); 192#ifdef CONFIG_CIFS_STATS2 193 atomic_inc(&totSmBufAllocCount); 194#endif /* CONFIG_CIFS_STATS2 */ 195 196 } 197 return ret_buf; 198} 199 200void 201cifs_small_buf_release(void *buf_to_free) 202{ 203 204 if (buf_to_free == NULL) { 205 cFYI(1, "Null buffer passed to cifs_small_buf_release"); 206 return; 207 } 208 mempool_free(buf_to_free, cifs_sm_req_poolp); 209 210 atomic_dec(&smBufAllocCount); 211 return; 212} 213 214/* 215 Find a free multiplex id (SMB mid). Otherwise there could be 216 mid collisions which might cause problems, demultiplexing the 217 wrong response to this request. Multiplex ids could collide if 218 one of a series requests takes much longer than the others, or 219 if a very large number of long lived requests (byte range 220 locks or FindNotify requests) are pending. No more than 221 64K-1 requests can be outstanding at one time. If no 222 mids are available, return zero. A future optimization 223 could make the combination of mids and uid the key we use 224 to demultiplex on (rather than mid alone). 225 In addition to the above check, the cifs demultiplex 226 code already used the command code as a secondary 227 check of the frame and if signing is negotiated the 228 response would be discarded if the mid were the same 229 but the signature was wrong. Since the mid is not put in the 230 pending queue until later (when it is about to be dispatched) 231 we do have to limit the number of outstanding requests 232 to somewhat less than 64K-1 although it is hard to imagine 233 so many threads being in the vfs at one time. 234*/ 235__u16 GetNextMid(struct TCP_Server_Info *server) 236{ 237 __u16 mid = 0; 238 __u16 last_mid; 239 int collision; 240 241 if (server == NULL) 242 return mid; 243 244 spin_lock(&GlobalMid_Lock); 245 last_mid = server->CurrentMid; /* we do not want to loop forever */ 246 server->CurrentMid++; 247 /* This nested loop looks more expensive than it is. 248 In practice the list of pending requests is short, 249 fewer than 50, and the mids are likely to be unique 250 on the first pass through the loop unless some request 251 takes longer than the 64 thousand requests before it 252 (and it would also have to have been a request that 253 did not time out) */ 254 while (server->CurrentMid != last_mid) { 255 struct list_head *tmp; 256 struct mid_q_entry *mid_entry; 257 258 collision = 0; 259 if (server->CurrentMid == 0) 260 server->CurrentMid++; 261 262 list_for_each(tmp, &server->pending_mid_q) { 263 mid_entry = list_entry(tmp, struct mid_q_entry, qhead); 264 265 if ((mid_entry->mid == server->CurrentMid) && 266 (mid_entry->midState == MID_REQUEST_SUBMITTED)) { 267 /* This mid is in use, try a different one */ 268 collision = 1; 269 break; 270 } 271 } 272 if (collision == 0) { 273 mid = server->CurrentMid; 274 break; 275 } 276 server->CurrentMid++; 277 } 278 spin_unlock(&GlobalMid_Lock); 279 return mid; 280} 281 282/* NB: MID can not be set if treeCon not passed in, in that 283 case it is responsbility of caller to set the mid */ 284void 285header_assemble(struct smb_hdr *buffer, char smb_command /* command */ , 286 const struct cifsTconInfo *treeCon, int word_count 287 /* length of fixed section (word count) in two byte units */) 288{ 289 struct list_head *temp_item; 290 struct cifsSesInfo *ses; 291 char *temp = (char *) buffer; 292 293 memset(temp, 0, 256); /* bigger than MAX_CIFS_HDR_SIZE */ 294 295 buffer->smb_buf_length = 296 (2 * word_count) + sizeof(struct smb_hdr) - 297 4 /* RFC 1001 length field does not count */ + 298 2 /* for bcc field itself */ ; 299 /* Note that this is the only network field that has to be converted 300 to big endian and it is done just before we send it */ 301 302 buffer->Protocol[0] = 0xFF; 303 buffer->Protocol[1] = 'S'; 304 buffer->Protocol[2] = 'M'; 305 buffer->Protocol[3] = 'B'; 306 buffer->Command = smb_command; 307 buffer->Flags = 0x00; /* case sensitive */ 308 buffer->Flags2 = SMBFLG2_KNOWS_LONG_NAMES; 309 buffer->Pid = cpu_to_le16((__u16)current->tgid); 310 buffer->PidHigh = cpu_to_le16((__u16)(current->tgid >> 16)); 311 if (treeCon) { 312 buffer->Tid = treeCon->tid; 313 if (treeCon->ses) { 314 if (treeCon->ses->capabilities & CAP_UNICODE) 315 buffer->Flags2 |= SMBFLG2_UNICODE; 316 if (treeCon->ses->capabilities & CAP_STATUS32) 317 buffer->Flags2 |= SMBFLG2_ERR_STATUS; 318 319 /* Uid is not converted */ 320 buffer->Uid = treeCon->ses->Suid; 321 buffer->Mid = GetNextMid(treeCon->ses->server); 322 if (multiuser_mount != 0) { 323 /* For the multiuser case, there are few obvious technically */ 324 /* possible mechanisms to match the local linux user (uid) */ 325 /* to a valid remote smb user (smb_uid): */ 326 /* 1) Query Winbind (or other local pam/nss daemon */ 327 /* for userid/password/logon_domain or credential */ 328 /* 2) Query Winbind for uid to sid to username mapping */ 329 /* and see if we have a matching password for existing*/ 330 /* session for that user perhas getting password by */ 331 /* adding a new pam_cifs module that stores passwords */ 332 /* so that the cifs vfs can get at that for all logged*/ 333 /* on users */ 334 /* 3) (Which is the mechanism we have chosen) */ 335 /* Search through sessions to the same server for a */ 336 /* a match on the uid that was passed in on mount */ 337 /* with the current processes uid (or euid?) and use */ 338 /* that smb uid. If no existing smb session for */ 339 /* that uid found, use the default smb session ie */ 340 /* the smb session for the volume mounted which is */ 341 /* the same as would be used if the multiuser mount */ 342 /* flag were disabled. */ 343 344 /* BB Add support for establishing new tCon and SMB Session */ 345 /* with userid/password pairs found on the smb session */ 346 /* for other target tcp/ip addresses BB */ 347 if (current_fsuid() != treeCon->ses->linux_uid) { 348 cFYI(1, "Multiuser mode and UID " 349 "did not match tcon uid"); 350 read_lock(&cifs_tcp_ses_lock); 351 list_for_each(temp_item, &treeCon->ses->server->smb_ses_list) { 352 ses = list_entry(temp_item, struct cifsSesInfo, smb_ses_list); 353 if (ses->linux_uid == current_fsuid()) { 354 if (ses->server == treeCon->ses->server) { 355 cFYI(1, "found matching uid substitute right smb_uid"); 356 buffer->Uid = ses->Suid; 357 break; 358 } else { 359 /* BB eventually call cifs_setup_session here */ 360 cFYI(1, "local UID found but no smb sess with this server exists"); 361 } 362 } 363 } 364 read_unlock(&cifs_tcp_ses_lock); 365 } 366 } 367 } 368 if (treeCon->Flags & SMB_SHARE_IS_IN_DFS) 369 buffer->Flags2 |= SMBFLG2_DFS; 370 if (treeCon->nocase) 371 buffer->Flags |= SMBFLG_CASELESS; 372 if ((treeCon->ses) && (treeCon->ses->server)) 373 if (treeCon->ses->server->secMode & 374 (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) 375 buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; 376 } 377 378/* endian conversion of flags is now done just before sending */ 379 buffer->WordCount = (char) word_count; 380 return; 381} 382 383static int 384checkSMBhdr(struct smb_hdr *smb, __u16 mid) 385{ 386 /* Make sure that this really is an SMB, that it is a response, 387 and that the message ids match */ 388 if ((*(__le32 *) smb->Protocol == cpu_to_le32(0x424d53ff)) && 389 (mid == smb->Mid)) { 390 if (smb->Flags & SMBFLG_RESPONSE) 391 return 0; 392 else { 393 /* only one valid case where server sends us request */ 394 if (smb->Command == SMB_COM_LOCKING_ANDX) 395 return 0; 396 else 397 cERROR(1, "Received Request not response"); 398 } 399 } else { /* bad signature or mid */ 400 if (*(__le32 *) smb->Protocol != cpu_to_le32(0x424d53ff)) 401 cERROR(1, "Bad protocol string signature header %x", 402 *(unsigned int *) smb->Protocol); 403 if (mid != smb->Mid) 404 cERROR(1, "Mids do not match"); 405 } 406 cERROR(1, "bad smb detected. The Mid=%d", smb->Mid); 407 return 1; 408} 409 410int 411checkSMB(struct smb_hdr *smb, __u16 mid, unsigned int length) 412{ 413 __u32 len = smb->smb_buf_length; 414 __u32 clc_len; /* calculated length */ 415 cFYI(0, "checkSMB Length: 0x%x, smb_buf_length: 0x%x", length, len); 416 417 if (length < 2 + sizeof(struct smb_hdr)) { 418 if ((length >= sizeof(struct smb_hdr) - 1) 419 && (smb->Status.CifsError != 0)) { 420 smb->WordCount = 0; 421 /* some error cases do not return wct and bcc */ 422 return 0; 423 } else if ((length == sizeof(struct smb_hdr) + 1) && 424 (smb->WordCount == 0)) { 425 char *tmp = (char *)smb; 426 /* First, check if the part of bcc they sent was zero */ 427 if (tmp[sizeof(struct smb_hdr)] == 0) { 428 /* some servers return only half of bcc 429 * on simple responses (wct, bcc both zero) 430 * in particular have seen this on 431 * ulogoffX and FindClose. This leaves 432 * one byte of bcc potentially unitialized 433 */ 434 /* zero rest of bcc */ 435 tmp[sizeof(struct smb_hdr)+1] = 0; 436 return 0; 437 } 438 cERROR(1, "rcvd invalid byte count (bcc)"); 439 } else { 440 cERROR(1, "Length less than smb header size"); 441 } 442 return 1; 443 } 444 if (len > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { 445 cERROR(1, "smb length greater than MaxBufSize, mid=%d", 446 smb->Mid); 447 return 1; 448 } 449 450 if (checkSMBhdr(smb, mid)) 451 return 1; 452 clc_len = smbCalcSize_LE(smb); 453 454 if (4 + len != length) { 455 cERROR(1, "Length read does not match RFC1001 length %d", 456 len); 457 return 1; 458 } 459 460 if (4 + len != clc_len) { 461 /* check if bcc wrapped around for large read responses */ 462 if ((len > 64 * 1024) && (len > clc_len)) { 463 /* check if lengths match mod 64K */ 464 if (((4 + len) & 0xFFFF) == (clc_len & 0xFFFF)) 465 return 0; /* bcc wrapped */ 466 } 467 cFYI(1, "Calculated size %d vs length %d mismatch for mid %d", 468 clc_len, 4 + len, smb->Mid); 469 /* Windows XP can return a few bytes too much, presumably 470 an illegal pad, at the end of byte range lock responses 471 so we allow for that three byte pad, as long as actual 472 received length is as long or longer than calculated length */ 473 /* We have now had to extend this more, since there is a 474 case in which it needs to be bigger still to handle a 475 malformed response to transact2 findfirst from WinXP when 476 access denied is returned and thus bcc and wct are zero 477 but server says length is 0x21 bytes too long as if the server 478 forget to reset the smb rfc1001 length when it reset the 479 wct and bcc to minimum size and drop the t2 parms and data */ 480 if ((4+len > clc_len) && (len <= clc_len + 512)) 481 return 0; 482 else { 483 cERROR(1, "RFC1001 size %d bigger than SMB for Mid=%d", 484 len, smb->Mid); 485 return 1; 486 } 487 } 488 return 0; 489} 490 491bool 492is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv) 493{ 494 struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf; 495 struct list_head *tmp, *tmp1, *tmp2; 496 struct cifsSesInfo *ses; 497 struct cifsTconInfo *tcon; 498 struct cifsInodeInfo *pCifsInode; 499 struct cifsFileInfo *netfile; 500 501 cFYI(1, "Checking for oplock break or dnotify response"); 502 if ((pSMB->hdr.Command == SMB_COM_NT_TRANSACT) && 503 (pSMB->hdr.Flags & SMBFLG_RESPONSE)) { 504 struct smb_com_transaction_change_notify_rsp *pSMBr = 505 (struct smb_com_transaction_change_notify_rsp *)buf; 506 struct file_notify_information *pnotify; 507 __u32 data_offset = 0; 508 if (pSMBr->ByteCount > sizeof(struct file_notify_information)) { 509 data_offset = le32_to_cpu(pSMBr->DataOffset); 510 511 pnotify = (struct file_notify_information *) 512 ((char *)&pSMBr->hdr.Protocol + data_offset); 513 cFYI(1, "dnotify on %s Action: 0x%x", 514 pnotify->FileName, pnotify->Action); 515 /* cifs_dump_mem("Rcvd notify Data: ",buf, 516 sizeof(struct smb_hdr)+60); */ 517 return true; 518 } 519 if (pSMBr->hdr.Status.CifsError) { 520 cFYI(1, "notify err 0x%d", 521 pSMBr->hdr.Status.CifsError); 522 return true; 523 } 524 return false; 525 } 526 if (pSMB->hdr.Command != SMB_COM_LOCKING_ANDX) 527 return false; 528 if (pSMB->hdr.Flags & SMBFLG_RESPONSE) { 529 /* no sense logging error on invalid handle on oplock 530 break - harmless race between close request and oplock 531 break response is expected from time to time writing out 532 large dirty files cached on the client */ 533 if ((NT_STATUS_INVALID_HANDLE) == 534 le32_to_cpu(pSMB->hdr.Status.CifsError)) { 535 cFYI(1, "invalid handle on oplock break"); 536 return true; 537 } else if (ERRbadfid == 538 le16_to_cpu(pSMB->hdr.Status.DosError.Error)) { 539 return true; 540 } else { 541 return false; /* on valid oplock brk we get "request" */ 542 } 543 } 544 if (pSMB->hdr.WordCount != 8) 545 return false; 546 547 cFYI(1, "oplock type 0x%d level 0x%d", 548 pSMB->LockType, pSMB->OplockLevel); 549 if (!(pSMB->LockType & LOCKING_ANDX_OPLOCK_RELEASE)) 550 return false; 551 552 /* look up tcon based on tid & uid */ 553 read_lock(&cifs_tcp_ses_lock); 554 list_for_each(tmp, &srv->smb_ses_list) { 555 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list); 556 list_for_each(tmp1, &ses->tcon_list) { 557 tcon = list_entry(tmp1, struct cifsTconInfo, tcon_list); 558 if (tcon->tid != buf->Tid) 559 continue; 560 561 cifs_stats_inc(&tcon->num_oplock_brks); 562 read_lock(&GlobalSMBSeslock); 563 list_for_each(tmp2, &tcon->openFileList) { 564 netfile = list_entry(tmp2, struct cifsFileInfo, 565 tlist); 566 if (pSMB->Fid != netfile->netfid) 567 continue; 568 569 /* 570 * don't do anything if file is about to be 571 * closed anyway. 572 */ 573 if (netfile->closePend) { 574 read_unlock(&GlobalSMBSeslock); 575 read_unlock(&cifs_tcp_ses_lock); 576 return true; 577 } 578 579 cFYI(1, "file id match, oplock break"); 580 pCifsInode = CIFS_I(netfile->pInode); 581 pCifsInode->clientCanCacheAll = false; 582 if (pSMB->OplockLevel == 0) 583 pCifsInode->clientCanCacheRead = false; 584 585 /* 586 * cifs_oplock_break_put() can't be called 587 * from here. Get reference after queueing 588 * succeeded. cifs_oplock_break() will 589 * synchronize using GlobalSMSSeslock. 590 */ 591 if (queue_work(system_nrt_wq, 592 &netfile->oplock_break)) 593 cifs_oplock_break_get(netfile); 594 netfile->oplock_break_cancelled = false; 595 596 read_unlock(&GlobalSMBSeslock); 597 read_unlock(&cifs_tcp_ses_lock); 598 return true; 599 } 600 read_unlock(&GlobalSMBSeslock); 601 read_unlock(&cifs_tcp_ses_lock); 602 cFYI(1, "No matching file for oplock break"); 603 return true; 604 } 605 } 606 read_unlock(&cifs_tcp_ses_lock); 607 cFYI(1, "Can not process oplock break for non-existent connection"); 608 return true; 609} 610 611void 612dump_smb(struct smb_hdr *smb_buf, int smb_buf_length) 613{ 614 int i, j; 615 char debug_line[17]; 616 unsigned char *buffer; 617 618 if (traceSMB == 0) 619 return; 620 621 buffer = (unsigned char *) smb_buf; 622 for (i = 0, j = 0; i < smb_buf_length; i++, j++) { 623 if (i % 8 == 0) { 624 /* have reached the beginning of line */ 625 printk(KERN_DEBUG "| "); 626 j = 0; 627 } 628 printk("%0#4x ", buffer[i]); 629 debug_line[2 * j] = ' '; 630 if (isprint(buffer[i])) 631 debug_line[1 + (2 * j)] = buffer[i]; 632 else 633 debug_line[1 + (2 * j)] = '_'; 634 635 if (i % 8 == 7) { 636 /* reached end of line, time to print ascii */ 637 debug_line[16] = 0; 638 printk(" | %s\n", debug_line); 639 } 640 } 641 for (; j < 8; j++) { 642 printk(" "); 643 debug_line[2 * j] = ' '; 644 debug_line[1 + (2 * j)] = ' '; 645 } 646 printk(" | %s\n", debug_line); 647 return; 648} 649 650/* Convert 16 bit Unicode pathname to wire format from string in current code 651 page. Conversion may involve remapping up the seven characters that are 652 only legal in POSIX-like OS (if they are present in the string). Path 653 names are little endian 16 bit Unicode on the wire */ 654int 655cifsConvertToUCS(__le16 *target, const char *source, int maxlen, 656 const struct nls_table *cp, int mapChars) 657{ 658 int i, j, charlen; 659 int len_remaining = maxlen; 660 char src_char; 661 __u16 temp; 662 663 if (!mapChars) 664 return cifs_strtoUCS(target, source, PATH_MAX, cp); 665 666 for (i = 0, j = 0; i < maxlen; j++) { 667 src_char = source[i]; 668 switch (src_char) { 669 case 0: 670 target[j] = 0; 671 goto ctoUCS_out; 672 case ':': 673 target[j] = cpu_to_le16(UNI_COLON); 674 break; 675 case '*': 676 target[j] = cpu_to_le16(UNI_ASTERIK); 677 break; 678 case '?': 679 target[j] = cpu_to_le16(UNI_QUESTION); 680 break; 681 case '<': 682 target[j] = cpu_to_le16(UNI_LESSTHAN); 683 break; 684 case '>': 685 target[j] = cpu_to_le16(UNI_GRTRTHAN); 686 break; 687 case '|': 688 target[j] = cpu_to_le16(UNI_PIPE); 689 break; 690 /* BB We can not handle remapping slash until 691 all the calls to build_path_from_dentry 692 are modified, as they use slash as separator BB */ 693 /* case '\\': 694 target[j] = cpu_to_le16(UNI_SLASH); 695 break;*/ 696 default: 697 charlen = cp->char2uni(source+i, 698 len_remaining, &temp); 699 /* if no match, use question mark, which 700 at least in some cases servers as wild card */ 701 if (charlen < 1) { 702 target[j] = cpu_to_le16(0x003f); 703 charlen = 1; 704 } else 705 target[j] = cpu_to_le16(temp); 706 len_remaining -= charlen; 707 /* character may take more than one byte in the 708 the source string, but will take exactly two 709 bytes in the target string */ 710 i += charlen; 711 continue; 712 } 713 i++; /* move to next char in source string */ 714 len_remaining--; 715 } 716 717ctoUCS_out: 718 return i; 719} 720 721void 722cifs_autodisable_serverino(struct cifs_sb_info *cifs_sb) 723{ 724 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) { 725 cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_SERVER_INUM; 726 cERROR(1, "Autodisabling the use of server inode numbers on " 727 "%s. This server doesn't seem to support them " 728 "properly. Hardlinks will not be recognized on this " 729 "mount. Consider mounting with the \"noserverino\" " 730 "option to silence this message.", 731 cifs_sb->tcon->treeName); 732 } 733} 734