Pileus Git - ~andy/linux/blob - fs/cifs/connect.c

   1 /*
   2  *   fs/cifs/connect.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2009
   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 #include <linux/fs.h>
  22 #include <linux/net.h>
  23 #include <linux/string.h>
  24 #include <linux/list.h>
  25 #include <linux/wait.h>
  26 #include <linux/slab.h>
  27 #include <linux/pagemap.h>
  28 #include <linux/ctype.h>
  29 #include <linux/utsname.h>
  30 #include <linux/mempool.h>
  31 #include <linux/delay.h>
  32 #include <linux/completion.h>
  33 #include <linux/kthread.h>
  34 #include <linux/pagevec.h>
  35 #include <linux/freezer.h>
  36 #include <linux/namei.h>
  37 #include <asm/uaccess.h>
  38 #include <asm/processor.h>
  39 #include <linux/inet.h>
  40 #include <net/ipv6.h>
  41 #include "cifspdu.h"
  42 #include "cifsglob.h"
  43 #include "cifsproto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "cifs_fs_sb.h"
  47 #include "ntlmssp.h"
  48 #include "nterr.h"
  49 #include "rfc1002pdu.h"
  50 #include "cn_cifs.h"
  51
  52 #define CIFS_PORT 445
  53 #define RFC1001_PORT 139
  54
  55 extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
  56                          unsigned char *p24);
  57
  58 extern mempool_t *cifs_req_poolp;
  59
  60 struct smb_vol {
  61         char *username;
  62         char *password;
  63         char *domainname;
  64         char *UNC;
  65         char *UNCip;
  66         char *iocharset;  /* local code page for mapping to and from Unicode */
  67         char source_rfc1001_name[16]; /* netbios name of client */
  68         char target_rfc1001_name[16]; /* netbios name of server for Win9x/ME */
  69         uid_t linux_uid;
  70         gid_t linux_gid;
  71         mode_t file_mode;
  72         mode_t dir_mode;
  73         unsigned secFlg;
  74         bool retry:1;
  75         bool intr:1;
  76         bool setuids:1;
  77         bool override_uid:1;
  78         bool override_gid:1;
  79         bool dynperm:1;
  80         bool noperm:1;
  81         bool no_psx_acl:1; /* set if posix acl support should be disabled */
  82         bool cifs_acl:1;
  83         bool no_xattr:1;   /* set if xattr (EA) support should be disabled*/
  84         bool server_ino:1; /* use inode numbers from server ie UniqueId */
  85         bool direct_io:1;
  86         bool remap:1;      /* set to remap seven reserved chars in filenames */
  87         bool posix_paths:1; /* unset to not ask for posix pathnames. */
  88         bool no_linux_ext:1;
  89         bool sfu_emul:1;
  90         bool nullauth:1;   /* attempt to authenticate with null user */
  91         bool nocase:1;     /* request case insensitive filenames */
  92         bool nobrl:1;      /* disable sending byte range locks to srv */
  93         bool mand_lock:1;  /* send mandatory not posix byte range lock reqs */
  94         bool seal:1;       /* request transport encryption on share */
  95         bool nodfs:1;      /* Do not request DFS, even if available */
  96         bool local_lease:1; /* check leases only on local system, not remote */
  97         bool noblocksnd:1;
  98         bool noautotune:1;
  99         bool nostrictsync:1; /* do not force expensive SMBflush on every sync */
 100         unsigned int rsize;
 101         unsigned int wsize;
 102         bool sockopt_tcp_nodelay:1;
 103         unsigned short int port;
 104         char *prepath;
 105         struct nls_table *local_nls;
 106 };
 107
 108 static int ipv4_connect(struct TCP_Server_Info *server);
 109 static int ipv6_connect(struct TCP_Server_Info *server);
 110
 111 /*
 112  * cifs tcp session reconnection
 113  *
 114  * mark tcp session as reconnecting so temporarily locked
 115  * mark all smb sessions as reconnecting for tcp session
 116  * reconnect tcp session
 117  * wake up waiters on reconnection? - (not needed currently)
 118  */
 119 static int
 120 cifs_reconnect(struct TCP_Server_Info *server)
 121 {
 122         int rc = 0;
 123         struct list_head *tmp, *tmp2;
 124         struct cifsSesInfo *ses;
 125         struct cifsTconInfo *tcon;
 126         struct mid_q_entry *mid_entry;
 127
 128         spin_lock(&GlobalMid_Lock);
 129         if (server->tcpStatus == CifsExiting) {
 130                 /* the demux thread will exit normally
 131                 next time through the loop */
 132                 spin_unlock(&GlobalMid_Lock);
 133                 return rc;
 134         } else
 135                 server->tcpStatus = CifsNeedReconnect;
 136         spin_unlock(&GlobalMid_Lock);
 137         server->maxBuf = 0;
 138
 139         cFYI(1, "Reconnecting tcp session");
 140
 141         /* before reconnecting the tcp session, mark the smb session (uid)
 142                 and the tid bad so they are not used until reconnected */
 143         read_lock(&cifs_tcp_ses_lock);
 144         list_for_each(tmp, &server->smb_ses_list) {
 145                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 146                 ses->need_reconnect = true;
 147                 ses->ipc_tid = 0;
 148                 list_for_each(tmp2, &ses->tcon_list) {
 149                         tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
 150                         tcon->need_reconnect = true;
 151                 }
 152         }
 153         read_unlock(&cifs_tcp_ses_lock);
 154         /* do not want to be sending data on a socket we are freeing */
 155         mutex_lock(&server->srv_mutex);
 156         if (server->ssocket) {
 157                 cFYI(1, "State: 0x%x Flags: 0x%lx", server->ssocket->state,
 158                         server->ssocket->flags);
 159                 kernel_sock_shutdown(server->ssocket, SHUT_WR);
 160                 cFYI(1, "Post shutdown state: 0x%x Flags: 0x%lx",
 161                         server->ssocket->state,
 162                         server->ssocket->flags);
 163                 sock_release(server->ssocket);
 164                 server->ssocket = NULL;
 165         }
 166
 167         spin_lock(&GlobalMid_Lock);
 168         list_for_each(tmp, &server->pending_mid_q) {
 169                 mid_entry = list_entry(tmp, struct
 170                                         mid_q_entry,
 171                                         qhead);
 172                 if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 173                                 /* Mark other intransit requests as needing
 174                                    retry so we do not immediately mark the
 175                                    session bad again (ie after we reconnect
 176                                    below) as they timeout too */
 177                         mid_entry->midState = MID_RETRY_NEEDED;
 178                 }
 179         }
 180         spin_unlock(&GlobalMid_Lock);
 181         mutex_unlock(&server->srv_mutex);
 182
 183         while ((server->tcpStatus != CifsExiting) &&
 184                (server->tcpStatus != CifsGood)) {
 185                 try_to_freeze();
 186                 if (server->addr.sockAddr6.sin6_family == AF_INET6)
 187                         rc = ipv6_connect(server);
 188                 else
 189                         rc = ipv4_connect(server);
 190                 if (rc) {
 191                         cFYI(1, "reconnect error %d", rc);
 192                         msleep(3000);
 193                 } else {
 194                         atomic_inc(&tcpSesReconnectCount);
 195                         spin_lock(&GlobalMid_Lock);
 196                         if (server->tcpStatus != CifsExiting)
 197                                 server->tcpStatus = CifsGood;
 198                         server->sequence_number = 0;
 199                         spin_unlock(&GlobalMid_Lock);
 200         /*              atomic_set(&server->inFlight,0);*/
 201                         wake_up(&server->response_q);
 202                 }
 203         }
 204         return rc;
 205 }
 206
 207 /*
 208         return codes:
 209                 0       not a transact2, or all data present
 210                 >0      transact2 with that much data missing
 211                 -EINVAL = invalid transact2
 212
 213  */
 214 static int check2ndT2(struct smb_hdr *pSMB, unsigned int maxBufSize)
 215 {
 216         struct smb_t2_rsp *pSMBt;
 217         int total_data_size;
 218         int data_in_this_rsp;
 219         int remaining;
 220
 221         if (pSMB->Command != SMB_COM_TRANSACTION2)
 222                 return 0;
 223
 224         /* check for plausible wct, bcc and t2 data and parm sizes */
 225         /* check for parm and data offset going beyond end of smb */
 226         if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */
 227                 cFYI(1, "invalid transact2 word count");
 228                 return -EINVAL;
 229         }
 230
 231         pSMBt = (struct smb_t2_rsp *)pSMB;
 232
 233         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 234         data_in_this_rsp = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 235
 236         remaining = total_data_size - data_in_this_rsp;
 237
 238         if (remaining == 0)
 239                 return 0;
 240         else if (remaining < 0) {
 241                 cFYI(1, "total data %d smaller than data in frame %d",
 242                         total_data_size, data_in_this_rsp);
 243                 return -EINVAL;
 244         } else {
 245                 cFYI(1, "missing %d bytes from transact2, check next response",
 246                         remaining);
 247                 if (total_data_size > maxBufSize) {
 248                         cERROR(1, "TotalDataSize %d is over maximum buffer %d",
 249                                 total_data_size, maxBufSize);
 250                         return -EINVAL;
 251                 }
 252                 return remaining;
 253         }
 254 }
 255
 256 static int coalesce_t2(struct smb_hdr *psecond, struct smb_hdr *pTargetSMB)
 257 {
 258         struct smb_t2_rsp *pSMB2 = (struct smb_t2_rsp *)psecond;
 259         struct smb_t2_rsp *pSMBt  = (struct smb_t2_rsp *)pTargetSMB;
 260         int total_data_size;
 261         int total_in_buf;
 262         int remaining;
 263         int total_in_buf2;
 264         char *data_area_of_target;
 265         char *data_area_of_buf2;
 266         __u16 byte_count;
 267
 268         total_data_size = le16_to_cpu(pSMBt->t2_rsp.TotalDataCount);
 269
 270         if (total_data_size != le16_to_cpu(pSMB2->t2_rsp.TotalDataCount)) {
 271                 cFYI(1, "total data size of primary and secondary t2 differ");
 272         }
 273
 274         total_in_buf = le16_to_cpu(pSMBt->t2_rsp.DataCount);
 275
 276         remaining = total_data_size - total_in_buf;
 277
 278         if (remaining < 0)
 279                 return -EINVAL;
 280
 281         if (remaining == 0) /* nothing to do, ignore */
 282                 return 0;
 283
 284         total_in_buf2 = le16_to_cpu(pSMB2->t2_rsp.DataCount);
 285         if (remaining < total_in_buf2) {
 286                 cFYI(1, "transact2 2nd response contains too much data");
 287         }
 288
 289         /* find end of first SMB data area */
 290         data_area_of_target = (char *)&pSMBt->hdr.Protocol +
 291                                 le16_to_cpu(pSMBt->t2_rsp.DataOffset);
 292         /* validate target area */
 293
 294         data_area_of_buf2 = (char *) &pSMB2->hdr.Protocol +
 295                                         le16_to_cpu(pSMB2->t2_rsp.DataOffset);
 296
 297         data_area_of_target += total_in_buf;
 298
 299         /* copy second buffer into end of first buffer */
 300         memcpy(data_area_of_target, data_area_of_buf2, total_in_buf2);
 301         total_in_buf += total_in_buf2;
 302         pSMBt->t2_rsp.DataCount = cpu_to_le16(total_in_buf);
 303         byte_count = le16_to_cpu(BCC_LE(pTargetSMB));
 304         byte_count += total_in_buf2;
 305         BCC_LE(pTargetSMB) = cpu_to_le16(byte_count);
 306
 307         byte_count = pTargetSMB->smb_buf_length;
 308         byte_count += total_in_buf2;
 309
 310         /* BB also add check that we are not beyond maximum buffer size */
 311
 312         pTargetSMB->smb_buf_length = byte_count;
 313
 314         if (remaining == total_in_buf2) {
 315                 cFYI(1, "found the last secondary response");
 316                 return 0; /* we are done */
 317         } else /* more responses to go */
 318                 return 1;
 319
 320 }
 321
 322 static int
 323 cifs_demultiplex_thread(struct TCP_Server_Info *server)
 324 {
 325         int length;
 326         unsigned int pdu_length, total_read;
 327         struct smb_hdr *smb_buffer = NULL;
 328         struct smb_hdr *bigbuf = NULL;
 329         struct smb_hdr *smallbuf = NULL;
 330         struct msghdr smb_msg;
 331         struct kvec iov;
 332         struct socket *csocket = server->ssocket;
 333         struct list_head *tmp;
 334         struct cifsSesInfo *ses;
 335         struct task_struct *task_to_wake = NULL;
 336         struct mid_q_entry *mid_entry;
 337         char temp;
 338         bool isLargeBuf = false;
 339         bool isMultiRsp;
 340         int reconnect;
 341
 342         current->flags |= PF_MEMALLOC;
 343         cFYI(1, "Demultiplex PID: %d", task_pid_nr(current));
 344
 345         length = atomic_inc_return(&tcpSesAllocCount);
 346         if (length > 1)
 347                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 348                                 GFP_KERNEL);
 349
 350         set_freezable();
 351         while (server->tcpStatus != CifsExiting) {
 352                 if (try_to_freeze())
 353                         continue;
 354                 if (bigbuf == NULL) {
 355                         bigbuf = cifs_buf_get();
 356                         if (!bigbuf) {
 357                                 cERROR(1, "No memory for large SMB response");
 358                                 msleep(3000);
 359                                 /* retry will check if exiting */
 360                                 continue;
 361                         }
 362                 } else if (isLargeBuf) {
 363                         /* we are reusing a dirty large buf, clear its start */
 364                         memset(bigbuf, 0, sizeof(struct smb_hdr));
 365                 }
 366
 367                 if (smallbuf == NULL) {
 368                         smallbuf = cifs_small_buf_get();
 369                         if (!smallbuf) {
 370                                 cERROR(1, "No memory for SMB response");
 371                                 msleep(1000);
 372                                 /* retry will check if exiting */
 373                                 continue;
 374                         }
 375                         /* beginning of smb buffer is cleared in our buf_get */
 376                 } else /* if existing small buf clear beginning */
 377                         memset(smallbuf, 0, sizeof(struct smb_hdr));
 378
 379                 isLargeBuf = false;
 380                 isMultiRsp = false;
 381                 smb_buffer = smallbuf;
 382                 iov.iov_base = smb_buffer;
 383                 iov.iov_len = 4;
 384                 smb_msg.msg_control = NULL;
 385                 smb_msg.msg_controllen = 0;
 386                 pdu_length = 4; /* enough to get RFC1001 header */
 387 incomplete_rcv:
 388                 length =
 389                     kernel_recvmsg(csocket, &smb_msg,
 390                                 &iov, 1, pdu_length, 0 /* BB other flags? */);
 391
 392                 if (server->tcpStatus == CifsExiting) {
 393                         break;
 394                 } else if (server->tcpStatus == CifsNeedReconnect) {
 395                         cFYI(1, "Reconnect after server stopped responding");
 396                         cifs_reconnect(server);
 397                         cFYI(1, "call to reconnect done");
 398                         csocket = server->ssocket;
 399                         continue;
 400                 } else if ((length == -ERESTARTSYS) || (length == -EAGAIN)) {
 401                         msleep(1); /* minimum sleep to prevent looping
 402                                 allowing socket to clear and app threads to set
 403                                 tcpStatus CifsNeedReconnect if server hung */
 404                         if (pdu_length < 4) {
 405                                 iov.iov_base = (4 - pdu_length) +
 406                                                         (char *)smb_buffer;
 407                                 iov.iov_len = pdu_length;
 408                                 smb_msg.msg_control = NULL;
 409                                 smb_msg.msg_controllen = 0;
 410                                 goto incomplete_rcv;
 411                         } else
 412                                 continue;
 413                 } else if (length <= 0) {
 414                         if (server->tcpStatus == CifsNew) {
 415                                 cFYI(1, "tcp session abend after SMBnegprot");
 416                                 /* some servers kill the TCP session rather than
 417                                    returning an SMB negprot error, in which
 418                                    case reconnecting here is not going to help,
 419                                    and so simply return error to mount */
 420                                 break;
 421                         }
 422                         if (!try_to_freeze() && (length == -EINTR)) {
 423                                 cFYI(1, "cifsd thread killed");
 424                                 break;
 425                         }
 426                         cFYI(1, "Reconnect after unexpected peek error %d",
 427                                 length);
 428                         cifs_reconnect(server);
 429                         csocket = server->ssocket;
 430                         wake_up(&server->response_q);
 431                         continue;
 432                 } else if (length < pdu_length) {
 433                         cFYI(1, "requested %d bytes but only got %d bytes",
 434                                   pdu_length, length);
 435                         pdu_length -= length;
 436                         msleep(1);
 437                         goto incomplete_rcv;
 438                 }
 439
 440                 /* The right amount was read from socket - 4 bytes */
 441                 /* so we can now interpret the length field */
 442
 443                 /* the first byte big endian of the length field,
 444                 is actually not part of the length but the type
 445                 with the most common, zero, as regular data */
 446                 temp = *((char *) smb_buffer);
 447
 448                 /* Note that FC 1001 length is big endian on the wire,
 449                 but we convert it here so it is always manipulated
 450                 as host byte order */
 451                 pdu_length = be32_to_cpu((__force __be32)smb_buffer->smb_buf_length);
 452                 smb_buffer->smb_buf_length = pdu_length;
 453
 454                 cFYI(1, "rfc1002 length 0x%x", pdu_length+4);
 455
 456                 if (temp == (char) RFC1002_SESSION_KEEP_ALIVE) {
 457                         continue;
 458                 } else if (temp == (char)RFC1002_POSITIVE_SESSION_RESPONSE) {
 459                         cFYI(1, "Good RFC 1002 session rsp");
 460                         continue;
 461                 } else if (temp == (char)RFC1002_NEGATIVE_SESSION_RESPONSE) {
 462                         /* we get this from Windows 98 instead of
 463                            an error on SMB negprot response */
 464                         cFYI(1, "Negative RFC1002 Session Response Error 0x%x)",
 465                                 pdu_length);
 466                         if (server->tcpStatus == CifsNew) {
 467                                 /* if nack on negprot (rather than
 468                                 ret of smb negprot error) reconnecting
 469                                 not going to help, ret error to mount */
 470                                 break;
 471                         } else {
 472                                 /* give server a second to
 473                                 clean up before reconnect attempt */
 474                                 msleep(1000);
 475                                 /* always try 445 first on reconnect
 476                                 since we get NACK on some if we ever
 477                                 connected to port 139 (the NACK is
 478                                 since we do not begin with RFC1001
 479                                 session initialize frame) */
 480                                 server->addr.sockAddr.sin_port =
 481                                         htons(CIFS_PORT);
 482                                 cifs_reconnect(server);
 483                                 csocket = server->ssocket;
 484                                 wake_up(&server->response_q);
 485                                 continue;
 486                         }
 487                 } else if (temp != (char) 0) {
 488                         cERROR(1, "Unknown RFC 1002 frame");
 489                         cifs_dump_mem(" Received Data: ", (char *)smb_buffer,
 490                                       length);
 491                         cifs_reconnect(server);
 492                         csocket = server->ssocket;
 493                         continue;
 494                 }
 495
 496                 /* else we have an SMB response */
 497                 if ((pdu_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) ||
 498                             (pdu_length < sizeof(struct smb_hdr) - 1 - 4)) {
 499                         cERROR(1, "Invalid size SMB length %d pdu_length %d",
 500                                         length, pdu_length+4);
 501                         cifs_reconnect(server);
 502                         csocket = server->ssocket;
 503                         wake_up(&server->response_q);
 504                         continue;
 505                 }
 506
 507                 /* else length ok */
 508                 reconnect = 0;
 509
 510                 if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
 511                         isLargeBuf = true;
 512                         memcpy(bigbuf, smallbuf, 4);
 513                         smb_buffer = bigbuf;
 514                 }
 515                 length = 0;
 516                 iov.iov_base = 4 + (char *)smb_buffer;
 517                 iov.iov_len = pdu_length;
 518                 for (total_read = 0; total_read < pdu_length;
 519                      total_read += length) {
 520                         length = kernel_recvmsg(csocket, &smb_msg, &iov, 1,
 521                                                 pdu_length - total_read, 0);
 522                         if ((server->tcpStatus == CifsExiting) ||
 523                             (length == -EINTR)) {
 524                                 /* then will exit */
 525                                 reconnect = 2;
 526                                 break;
 527                         } else if (server->tcpStatus == CifsNeedReconnect) {
 528                                 cifs_reconnect(server);
 529                                 csocket = server->ssocket;
 530                                 /* Reconnect wakes up rspns q */
 531                                 /* Now we will reread sock */
 532                                 reconnect = 1;
 533                                 break;
 534                         } else if ((length == -ERESTARTSYS) ||
 535                                    (length == -EAGAIN)) {
 536                                 msleep(1); /* minimum sleep to prevent looping,
 537                                               allowing socket to clear and app
 538                                               threads to set tcpStatus
 539                                               CifsNeedReconnect if server hung*/
 540                                 length = 0;
 541                                 continue;
 542                         } else if (length <= 0) {
 543                                 cERROR(1, "Received no data, expecting %d",
 544                                               pdu_length - total_read);
 545                                 cifs_reconnect(server);
 546                                 csocket = server->ssocket;
 547                                 reconnect = 1;
 548                                 break;
 549                         }
 550                 }
 551                 if (reconnect == 2)
 552                         break;
 553                 else if (reconnect == 1)
 554                         continue;
 555
 556                 length += 4; /* account for rfc1002 hdr */
 557
 558
 559                 dump_smb(smb_buffer, length);
 560                 if (checkSMB(smb_buffer, smb_buffer->Mid, total_read+4)) {
 561                         cifs_dump_mem("Bad SMB: ", smb_buffer, 48);
 562                         continue;
 563                 }
 564
 565
 566                 task_to_wake = NULL;
 567                 spin_lock(&GlobalMid_Lock);
 568                 list_for_each(tmp, &server->pending_mid_q) {
 569                         mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 570
 571                         if ((mid_entry->mid == smb_buffer->Mid) &&
 572                             (mid_entry->midState == MID_REQUEST_SUBMITTED) &&
 573                             (mid_entry->command == smb_buffer->Command)) {
 574                                 if (check2ndT2(smb_buffer,server->maxBuf) > 0) {
 575                                         /* We have a multipart transact2 resp */
 576                                         isMultiRsp = true;
 577                                         if (mid_entry->resp_buf) {
 578                                                 /* merge response - fix up 1st*/
 579                                                 if (coalesce_t2(smb_buffer,
 580                                                         mid_entry->resp_buf)) {
 581                                                         mid_entry->multiRsp =
 582                                                                  true;
 583                                                         break;
 584                                                 } else {
 585                                                         /* all parts received */
 586                                                         mid_entry->multiEnd =
 587                                                                  true;
 588                                                         goto multi_t2_fnd;
 589                                                 }
 590                                         } else {
 591                                                 if (!isLargeBuf) {
 592                                                         cERROR(1, "1st trans2 resp needs bigbuf");
 593                                         /* BB maybe we can fix this up,  switch
 594                                            to already allocated large buffer? */
 595                                                 } else {
 596                                                         /* Have first buffer */
 597                                                         mid_entry->resp_buf =
 598                                                                  smb_buffer;
 599                                                         mid_entry->largeBuf =
 600                                                                  true;
 601                                                         bigbuf = NULL;
 602                                                 }
 603                                         }
 604                                         break;
 605                                 }
 606                                 mid_entry->resp_buf = smb_buffer;
 607                                 mid_entry->largeBuf = isLargeBuf;
 608 multi_t2_fnd:
 609                                 task_to_wake = mid_entry->tsk;
 610                                 mid_entry->midState = MID_RESPONSE_RECEIVED;
 611 #ifdef CONFIG_CIFS_STATS2
 612                                 mid_entry->when_received = jiffies;
 613 #endif
 614                                 /* so we do not time out requests to  server
 615                                 which is still responding (since server could
 616                                 be busy but not dead) */
 617                                 server->lstrp = jiffies;
 618                                 break;
 619                         }
 620                 }
 621                 spin_unlock(&GlobalMid_Lock);
 622                 if (task_to_wake) {
 623                         /* Was previous buf put in mpx struct for multi-rsp? */
 624                         if (!isMultiRsp) {
 625                                 /* smb buffer will be freed by user thread */
 626                                 if (isLargeBuf)
 627                                         bigbuf = NULL;
 628                                 else
 629                                         smallbuf = NULL;
 630                         }
 631                         wake_up_process(task_to_wake);
 632                 } else if (!is_valid_oplock_break(smb_buffer, server) &&
 633                            !isMultiRsp) {
 634                         cERROR(1, "No task to wake, unknown frame received! "
 635                                    "NumMids %d", midCount.counter);
 636                         cifs_dump_mem("Received Data is: ", (char *)smb_buffer,
 637                                       sizeof(struct smb_hdr));
 638 #ifdef CONFIG_CIFS_DEBUG2
 639                         cifs_dump_detail(smb_buffer);
 640                         cifs_dump_mids(server);
 641 #endif /* CIFS_DEBUG2 */
 642
 643                 }
 644         } /* end while !EXITING */
 645
 646         /* take it off the list, if it's not already */
 647         write_lock(&cifs_tcp_ses_lock);
 648         list_del_init(&server->tcp_ses_list);
 649         write_unlock(&cifs_tcp_ses_lock);
 650
 651         spin_lock(&GlobalMid_Lock);
 652         server->tcpStatus = CifsExiting;
 653         spin_unlock(&GlobalMid_Lock);
 654         wake_up_all(&server->response_q);
 655
 656         /* check if we have blocked requests that need to free */
 657         /* Note that cifs_max_pending is normally 50, but
 658         can be set at module install time to as little as two */
 659         spin_lock(&GlobalMid_Lock);
 660         if (atomic_read(&server->inFlight) >= cifs_max_pending)
 661                 atomic_set(&server->inFlight, cifs_max_pending - 1);
 662         /* We do not want to set the max_pending too low or we
 663         could end up with the counter going negative */
 664         spin_unlock(&GlobalMid_Lock);
 665         /* Although there should not be any requests blocked on
 666         this queue it can not hurt to be paranoid and try to wake up requests
 667         that may haven been blocked when more than 50 at time were on the wire
 668         to the same server - they now will see the session is in exit state
 669         and get out of SendReceive.  */
 670         wake_up_all(&server->request_q);
 671         /* give those requests time to exit */
 672         msleep(125);
 673
 674         if (server->ssocket) {
 675                 sock_release(csocket);
 676                 server->ssocket = NULL;
 677         }
 678         /* buffer usuallly freed in free_mid - need to free it here on exit */
 679         cifs_buf_release(bigbuf);
 680         if (smallbuf) /* no sense logging a debug message if NULL */
 681                 cifs_small_buf_release(smallbuf);
 682
 683         /*
 684          * BB: we shouldn't have to do any of this. It shouldn't be
 685          * possible to exit from the thread with active SMB sessions
 686          */
 687         read_lock(&cifs_tcp_ses_lock);
 688         if (list_empty(&server->pending_mid_q)) {
 689                 /* loop through server session structures attached to this and
 690                     mark them dead */
 691                 list_for_each(tmp, &server->smb_ses_list) {
 692                         ses = list_entry(tmp, struct cifsSesInfo,
 693                                          smb_ses_list);
 694                         ses->status = CifsExiting;
 695                         ses->server = NULL;
 696                 }
 697                 read_unlock(&cifs_tcp_ses_lock);
 698         } else {
 699                 /* although we can not zero the server struct pointer yet,
 700                 since there are active requests which may depnd on them,
 701                 mark the corresponding SMB sessions as exiting too */
 702                 list_for_each(tmp, &server->smb_ses_list) {
 703                         ses = list_entry(tmp, struct cifsSesInfo,
 704                                          smb_ses_list);
 705                         ses->status = CifsExiting;
 706                 }
 707
 708                 spin_lock(&GlobalMid_Lock);
 709                 list_for_each(tmp, &server->pending_mid_q) {
 710                 mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 711                         if (mid_entry->midState == MID_REQUEST_SUBMITTED) {
 712                                 cFYI(1, "Clearing Mid 0x%x - waking up ",
 713                                          mid_entry->mid);
 714                                 task_to_wake = mid_entry->tsk;
 715                                 if (task_to_wake)
 716                                         wake_up_process(task_to_wake);
 717                         }
 718                 }
 719                 spin_unlock(&GlobalMid_Lock);
 720                 read_unlock(&cifs_tcp_ses_lock);
 721                 /* 1/8th of sec is more than enough time for them to exit */
 722                 msleep(125);
 723         }
 724
 725         if (!list_empty(&server->pending_mid_q)) {
 726                 /* mpx threads have not exited yet give them
 727                 at least the smb send timeout time for long ops */
 728                 /* due to delays on oplock break requests, we need
 729                 to wait at least 45 seconds before giving up
 730                 on a request getting a response and going ahead
 731                 and killing cifsd */
 732                 cFYI(1, "Wait for exit from demultiplex thread");
 733                 msleep(46000);
 734                 /* if threads still have not exited they are probably never
 735                 coming home not much else we can do but free the memory */
 736         }
 737
 738         /* last chance to mark ses pointers invalid
 739         if there are any pointing to this (e.g
 740         if a crazy root user tried to kill cifsd
 741         kernel thread explicitly this might happen) */
 742         /* BB: This shouldn't be necessary, see above */
 743         read_lock(&cifs_tcp_ses_lock);
 744         list_for_each(tmp, &server->smb_ses_list) {
 745                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
 746                 ses->server = NULL;
 747         }
 748         read_unlock(&cifs_tcp_ses_lock);
 749
 750         kfree(server->hostname);
 751         task_to_wake = xchg(&server->tsk, NULL);
 752         kfree(server);
 753
 754         length = atomic_dec_return(&tcpSesAllocCount);
 755         if (length  > 0)
 756                 mempool_resize(cifs_req_poolp, length + cifs_min_rcv,
 757                                 GFP_KERNEL);
 758
 759         /* if server->tsk was NULL then wait for a signal before exiting */
 760         if (!task_to_wake) {
 761                 set_current_state(TASK_INTERRUPTIBLE);
 762                 while (!signal_pending(current)) {
 763                         schedule();
 764                         set_current_state(TASK_INTERRUPTIBLE);
 765                 }
 766                 set_current_state(TASK_RUNNING);
 767         }
 768
 769         module_put_and_exit(0);
 770 }
 771
 772 /* extract the host portion of the UNC string */
 773 static char *
 774 extract_hostname(const char *unc)
 775 {
 776         const char *src;
 777         char *dst, *delim;
 778         unsigned int len;
 779
 780         /* skip double chars at beginning of string */
 781         /* BB: check validity of these bytes? */
 782         src = unc + 2;
 783
 784         /* delimiter between hostname and sharename is always '\\' now */
 785         delim = strchr(src, '\\');
 786         if (!delim)
 787                 return ERR_PTR(-EINVAL);
 788
 789         len = delim - src;
 790         dst = kmalloc((len + 1), GFP_KERNEL);
 791         if (dst == NULL)
 792                 return ERR_PTR(-ENOMEM);
 793
 794         memcpy(dst, src, len);
 795         dst[len] = '\0';
 796
 797         return dst;
 798 }
 799
 800 static int
 801 cifs_parse_mount_options(char *options, const char *devname,
 802                          struct smb_vol *vol)
 803 {
 804         char *value;
 805         char *data;
 806         unsigned int  temp_len, i, j;
 807         char separator[2];
 808         short int override_uid = -1;
 809         short int override_gid = -1;
 810         bool uid_specified = false;
 811         bool gid_specified = false;
 812
 813         separator[0] = ',';
 814         separator[1] = 0;
 815
 816         if (Local_System_Name[0] != 0)
 817                 memcpy(vol->source_rfc1001_name, Local_System_Name, 15);
 818         else {
 819                 char *nodename = utsname()->nodename;
 820                 int n = strnlen(nodename, 15);
 821                 memset(vol->source_rfc1001_name, 0x20, 15);
 822                 for (i = 0; i < n; i++) {
 823                         /* does not have to be perfect mapping since field is
 824                         informational, only used for servers that do not support
 825                         port 445 and it can be overridden at mount time */
 826                         vol->source_rfc1001_name[i] = toupper(nodename[i]);
 827                 }
 828         }
 829         vol->source_rfc1001_name[15] = 0;
 830         /* null target name indicates to use *SMBSERVR default called name
 831            if we end up sending RFC1001 session initialize */
 832         vol->target_rfc1001_name[0] = 0;
 833         vol->linux_uid = current_uid();  /* use current_euid() instead? */
 834         vol->linux_gid = current_gid();
 835
 836         /* default to only allowing write access to owner of the mount */
 837         vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
 838
 839         /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
 840         /* default is always to request posix paths. */
 841         vol->posix_paths = 1;
 842         /* default to using server inode numbers where available */
 843         vol->server_ino = 1;
 844
 845         if (!options)
 846                 return 1;
 847
 848         if (strncmp(options, "sep=", 4) == 0) {
 849                 if (options[4] != 0) {
 850                         separator[0] = options[4];
 851                         options += 5;
 852                 } else {
 853                         cFYI(1, "Null separator not allowed");
 854                 }
 855         }
 856
 857         while ((data = strsep(&options, separator)) != NULL) {
 858                 if (!*data)
 859                         continue;
 860                 if ((value = strchr(data, '=')) != NULL)
 861                         *value++ = '\0';
 862
 863                 /* Have to parse this before we parse for "user" */
 864                 if (strnicmp(data, "user_xattr", 10) == 0) {
 865                         vol->no_xattr = 0;
 866                 } else if (strnicmp(data, "nouser_xattr", 12) == 0) {
 867                         vol->no_xattr = 1;
 868                 } else if (strnicmp(data, "user", 4) == 0) {
 869                         if (!value) {
 870                                 printk(KERN_WARNING
 871                                        "CIFS: invalid or missing username\n");
 872                                 return 1;       /* needs_arg; */
 873                         } else if (!*value) {
 874                                 /* null user, ie anonymous, authentication */
 875                                 vol->nullauth = 1;
 876                         }
 877                         if (strnlen(value, 200) < 200) {
 878                                 vol->username = value;
 879                         } else {
 880                                 printk(KERN_WARNING "CIFS: username too long\n");
 881                                 return 1;
 882                         }
 883                 } else if (strnicmp(data, "pass", 4) == 0) {
 884                         if (!value) {
 885                                 vol->password = NULL;
 886                                 continue;
 887                         } else if (value[0] == 0) {
 888                                 /* check if string begins with double comma
 889                                    since that would mean the password really
 890                                    does start with a comma, and would not
 891                                    indicate an empty string */
 892                                 if (value[1] != separator[0]) {
 893                                         vol->password = NULL;
 894                                         continue;
 895                                 }
 896                         }
 897                         temp_len = strlen(value);
 898                         /* removed password length check, NTLM passwords
 899                                 can be arbitrarily long */
 900
 901                         /* if comma in password, the string will be
 902                         prematurely null terminated.  Commas in password are
 903                         specified across the cifs mount interface by a double
 904                         comma ie ,, and a comma used as in other cases ie ','
 905                         as a parameter delimiter/separator is single and due
 906                         to the strsep above is temporarily zeroed. */
 907
 908                         /* NB: password legally can have multiple commas and
 909                         the only illegal character in a password is null */
 910
 911                         if ((value[temp_len] == 0) &&
 912                             (value[temp_len+1] == separator[0])) {
 913                                 /* reinsert comma */
 914                                 value[temp_len] = separator[0];
 915                                 temp_len += 2;  /* move after second comma */
 916                                 while (value[temp_len] != 0)  {
 917                                         if (value[temp_len] == separator[0]) {
 918                                                 if (value[temp_len+1] ==
 919                                                      separator[0]) {
 920                                                 /* skip second comma */
 921                                                         temp_len++;
 922                                                 } else {
 923                                                 /* single comma indicating start
 924                                                          of next parm */
 925                                                         break;
 926                                                 }
 927                                         }
 928                                         temp_len++;
 929                                 }
 930                                 if (value[temp_len] == 0) {
 931                                         options = NULL;
 932                                 } else {
 933                                         value[temp_len] = 0;
 934                                         /* point option to start of next parm */
 935                                         options = value + temp_len + 1;
 936                                 }
 937                                 /* go from value to value + temp_len condensing
 938                                 double commas to singles. Note that this ends up
 939                                 allocating a few bytes too many, which is ok */
 940                                 vol->password = kzalloc(temp_len, GFP_KERNEL);
 941                                 if (vol->password == NULL) {
 942                                         printk(KERN_WARNING "CIFS: no memory "
 943                                                             "for password\n");
 944                                         return 1;
 945                                 }
 946                                 for (i = 0, j = 0; i < temp_len; i++, j++) {
 947                                         vol->password[j] = value[i];
 948                                         if (value[i] == separator[0]
 949                                                 && value[i+1] == separator[0]) {
 950                                                 /* skip second comma */
 951                                                 i++;
 952                                         }
 953                                 }
 954                                 vol->password[j] = 0;
 955                         } else {
 956                                 vol->password = kzalloc(temp_len+1, GFP_KERNEL);
 957                                 if (vol->password == NULL) {
 958                                         printk(KERN_WARNING "CIFS: no memory "
 959                                                             "for password\n");
 960                                         return 1;
 961                                 }
 962                                 strcpy(vol->password, value);
 963                         }
 964                 } else if (!strnicmp(data, "ip", 2) ||
 965                            !strnicmp(data, "addr", 4)) {
 966                         if (!value || !*value) {
 967                                 vol->UNCip = NULL;
 968                         } else if (strnlen(value, INET6_ADDRSTRLEN) <
 969                                                         INET6_ADDRSTRLEN) {
 970                                 vol->UNCip = value;
 971                         } else {
 972                                 printk(KERN_WARNING "CIFS: ip address "
 973                                                     "too long\n");
 974                                 return 1;
 975                         }
 976                 } else if (strnicmp(data, "sec", 3) == 0) {
 977                         if (!value || !*value) {
 978                                 cERROR(1, "no security value specified");
 979                                 continue;
 980                         } else if (strnicmp(value, "krb5i", 5) == 0) {
 981                                 vol->secFlg |= CIFSSEC_MAY_KRB5 |
 982                                         CIFSSEC_MUST_SIGN;
 983                         } else if (strnicmp(value, "krb5p", 5) == 0) {
 984                                 /* vol->secFlg |= CIFSSEC_MUST_SEAL |
 985                                         CIFSSEC_MAY_KRB5; */
 986                                 cERROR(1, "Krb5 cifs privacy not supported");
 987                                 return 1;
 988                         } else if (strnicmp(value, "krb5", 4) == 0) {
 989                                 vol->secFlg |= CIFSSEC_MAY_KRB5;
 990 #ifdef CONFIG_CIFS_EXPERIMENTAL
 991                         } else if (strnicmp(value, "ntlmsspi", 8) == 0) {
 992                                 vol->secFlg |= CIFSSEC_MAY_NTLMSSP |
 993                                         CIFSSEC_MUST_SIGN;
 994                         } else if (strnicmp(value, "ntlmssp", 7) == 0) {
 995                                 vol->secFlg |= CIFSSEC_MAY_NTLMSSP;
 996 #endif
 997                         } else if (strnicmp(value, "ntlmv2i", 7) == 0) {
 998                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2 |
 999                                         CIFSSEC_MUST_SIGN;
1000                         } else if (strnicmp(value, "ntlmv2", 6) == 0) {
1001                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1002                         } else if (strnicmp(value, "ntlmi", 5) == 0) {
1003                                 vol->secFlg |= CIFSSEC_MAY_NTLM |
1004                                         CIFSSEC_MUST_SIGN;
1005                         } else if (strnicmp(value, "ntlm", 4) == 0) {
1006                                 /* ntlm is default so can be turned off too */
1007                                 vol->secFlg |= CIFSSEC_MAY_NTLM;
1008                         } else if (strnicmp(value, "nontlm", 6) == 0) {
1009                                 /* BB is there a better way to do this? */
1010                                 vol->secFlg |= CIFSSEC_MAY_NTLMV2;
1011 #ifdef CONFIG_CIFS_WEAK_PW_HASH
1012                         } else if (strnicmp(value, "lanman", 6) == 0) {
1013                                 vol->secFlg |= CIFSSEC_MAY_LANMAN;
1014 #endif
1015                         } else if (strnicmp(value, "none", 4) == 0) {
1016                                 vol->nullauth = 1;
1017                         } else {
1018                                 cERROR(1, "bad security option: %s", value);
1019                                 return 1;
1020                         }
1021                 } else if ((strnicmp(data, "unc", 3) == 0)
1022                            || (strnicmp(data, "target", 6) == 0)
1023                            || (strnicmp(data, "path", 4) == 0)) {
1024                         if (!value || !*value) {
1025                                 printk(KERN_WARNING "CIFS: invalid path to "
1026                                                     "network resource\n");
1027                                 return 1;       /* needs_arg; */
1028                         }
1029                         if ((temp_len = strnlen(value, 300)) < 300) {
1030                                 vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1031                                 if (vol->UNC == NULL)
1032                                         return 1;
1033                                 strcpy(vol->UNC, value);
1034                                 if (strncmp(vol->UNC, "//", 2) == 0) {
1035                                         vol->UNC[0] = '\\';
1036                                         vol->UNC[1] = '\\';
1037                                 } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1038                                         printk(KERN_WARNING
1039                                                "CIFS: UNC Path does not begin "
1040                                                "with // or \\\\ \n");
1041                                         return 1;
1042                                 }
1043                         } else {
1044                                 printk(KERN_WARNING "CIFS: UNC name too long\n");
1045                                 return 1;
1046                         }
1047                 } else if ((strnicmp(data, "domain", 3) == 0)
1048                            || (strnicmp(data, "workgroup", 5) == 0)) {
1049                         if (!value || !*value) {
1050                                 printk(KERN_WARNING "CIFS: invalid domain name\n");
1051                                 return 1;       /* needs_arg; */
1052                         }
1053                         /* BB are there cases in which a comma can be valid in
1054                         a domain name and need special handling? */
1055                         if (strnlen(value, 256) < 256) {
1056                                 vol->domainname = value;
1057                                 cFYI(1, "Domain name set");
1058                         } else {
1059                                 printk(KERN_WARNING "CIFS: domain name too "
1060                                                     "long\n");
1061                                 return 1;
1062                         }
1063                 } else if (strnicmp(data, "prefixpath", 10) == 0) {
1064                         if (!value || !*value) {
1065                                 printk(KERN_WARNING
1066                                         "CIFS: invalid path prefix\n");
1067                                 return 1;       /* needs_argument */
1068                         }
1069                         if ((temp_len = strnlen(value, 1024)) < 1024) {
1070                                 if (value[0] != '/')
1071                                         temp_len++;  /* missing leading slash */
1072                                 vol->prepath = kmalloc(temp_len+1, GFP_KERNEL);
1073                                 if (vol->prepath == NULL)
1074                                         return 1;
1075                                 if (value[0] != '/') {
1076                                         vol->prepath[0] = '/';
1077                                         strcpy(vol->prepath+1, value);
1078                                 } else
1079                                         strcpy(vol->prepath, value);
1080                                 cFYI(1, "prefix path %s", vol->prepath);
1081                         } else {
1082                                 printk(KERN_WARNING "CIFS: prefix too long\n");
1083                                 return 1;
1084                         }
1085                 } else if (strnicmp(data, "iocharset", 9) == 0) {
1086                         if (!value || !*value) {
1087                                 printk(KERN_WARNING "CIFS: invalid iocharset "
1088                                                     "specified\n");
1089                                 return 1;       /* needs_arg; */
1090                         }
1091                         if (strnlen(value, 65) < 65) {
1092                                 if (strnicmp(value, "default", 7))
1093                                         vol->iocharset = value;
1094                                 /* if iocharset not set then load_nls_default
1095                                    is used by caller */
1096                                 cFYI(1, "iocharset set to %s", value);
1097                         } else {
1098                                 printk(KERN_WARNING "CIFS: iocharset name "
1099                                                     "too long.\n");
1100                                 return 1;
1101                         }
1102                 } else if (!strnicmp(data, "uid", 3) && value && *value) {
1103                         vol->linux_uid = simple_strtoul(value, &value, 0);
1104                         uid_specified = true;
1105                 } else if (!strnicmp(data, "forceuid", 8)) {
1106                         override_uid = 1;
1107                 } else if (!strnicmp(data, "noforceuid", 10)) {
1108                         override_uid = 0;
1109                 } else if (!strnicmp(data, "gid", 3) && value && *value) {
1110                         vol->linux_gid = simple_strtoul(value, &value, 0);
1111                         gid_specified = true;
1112                 } else if (!strnicmp(data, "forcegid", 8)) {
1113                         override_gid = 1;
1114                 } else if (!strnicmp(data, "noforcegid", 10)) {
1115                         override_gid = 0;
1116                 } else if (strnicmp(data, "file_mode", 4) == 0) {
1117                         if (value && *value) {
1118                                 vol->file_mode =
1119                                         simple_strtoul(value, &value, 0);
1120                         }
1121                 } else if (strnicmp(data, "dir_mode", 4) == 0) {
1122                         if (value && *value) {
1123                                 vol->dir_mode =
1124                                         simple_strtoul(value, &value, 0);
1125                         }
1126                 } else if (strnicmp(data, "dirmode", 4) == 0) {
1127                         if (value && *value) {
1128                                 vol->dir_mode =
1129                                         simple_strtoul(value, &value, 0);
1130                         }
1131                 } else if (strnicmp(data, "port", 4) == 0) {
1132                         if (value && *value) {
1133                                 vol->port =
1134                                         simple_strtoul(value, &value, 0);
1135                         }
1136                 } else if (strnicmp(data, "rsize", 5) == 0) {
1137                         if (value && *value) {
1138                                 vol->rsize =
1139                                         simple_strtoul(value, &value, 0);
1140                         }
1141                 } else if (strnicmp(data, "wsize", 5) == 0) {
1142                         if (value && *value) {
1143                                 vol->wsize =
1144                                         simple_strtoul(value, &value, 0);
1145                         }
1146                 } else if (strnicmp(data, "sockopt", 5) == 0) {
1147                         if (!value || !*value) {
1148                                 cERROR(1, "no socket option specified");
1149                                 continue;
1150                         } else if (strnicmp(value, "TCP_NODELAY", 11) == 0) {
1151                                 vol->sockopt_tcp_nodelay = 1;
1152                         }
1153                 } else if (strnicmp(data, "netbiosname", 4) == 0) {
1154                         if (!value || !*value || (*value == ' ')) {
1155                                 cFYI(1, "invalid (empty) netbiosname");
1156                         } else {
1157                                 memset(vol->source_rfc1001_name, 0x20, 15);
1158                                 for (i = 0; i < 15; i++) {
1159                                 /* BB are there cases in which a comma can be
1160                                 valid in this workstation netbios name (and need
1161                                 special handling)? */
1162
1163                                 /* We do not uppercase netbiosname for user */
1164                                         if (value[i] == 0)
1165                                                 break;
1166                                         else
1167                                                 vol->source_rfc1001_name[i] =
1168                                                                 value[i];
1169                                 }
1170                                 /* The string has 16th byte zero still from
1171                                 set at top of the function  */
1172                                 if ((i == 15) && (value[i] != 0))
1173                                         printk(KERN_WARNING "CIFS: netbiosname"
1174                                                 " longer than 15 truncated.\n");
1175                         }
1176                 } else if (strnicmp(data, "servern", 7) == 0) {
1177                         /* servernetbiosname specified override *SMBSERVER */
1178                         if (!value || !*value || (*value == ' ')) {
1179                                 cFYI(1, "empty server netbiosname specified");
1180                         } else {
1181                                 /* last byte, type, is 0x20 for servr type */
1182                                 memset(vol->target_rfc1001_name, 0x20, 16);
1183
1184                                 for (i = 0; i < 15; i++) {
1185                                 /* BB are there cases in which a comma can be
1186                                    valid in this workstation netbios name
1187                                    (and need special handling)? */
1188
1189                                 /* user or mount helper must uppercase
1190                                    the netbiosname */
1191                                         if (value[i] == 0)
1192                                                 break;
1193                                         else
1194                                                 vol->target_rfc1001_name[i] =
1195                                                                 value[i];
1196                                 }
1197                                 /* The string has 16th byte zero still from
1198                                    set at top of the function  */
1199                                 if ((i == 15) && (value[i] != 0))
1200                                         printk(KERN_WARNING "CIFS: server net"
1201                                         "biosname longer than 15 truncated.\n");
1202                         }
1203                 } else if (strnicmp(data, "credentials", 4) == 0) {
1204                         /* ignore */
1205                 } else if (strnicmp(data, "version", 3) == 0) {
1206                         /* ignore */
1207                 } else if (strnicmp(data, "guest", 5) == 0) {
1208                         /* ignore */
1209                 } else if (strnicmp(data, "rw", 2) == 0) {
1210                         /* ignore */
1211                 } else if (strnicmp(data, "ro", 2) == 0) {
1212                         /* ignore */
1213                 } else if (strnicmp(data, "noblocksend", 11) == 0) {
1214                         vol->noblocksnd = 1;
1215                 } else if (strnicmp(data, "noautotune", 10) == 0) {
1216                         vol->noautotune = 1;
1217                 } else if ((strnicmp(data, "suid", 4) == 0) ||
1218                                    (strnicmp(data, "nosuid", 6) == 0) ||
1219                                    (strnicmp(data, "exec", 4) == 0) ||
1220                                    (strnicmp(data, "noexec", 6) == 0) ||
1221                                    (strnicmp(data, "nodev", 5) == 0) ||
1222                                    (strnicmp(data, "noauto", 6) == 0) ||
1223                                    (strnicmp(data, "dev", 3) == 0)) {
1224                         /*  The mount tool or mount.cifs helper (if present)
1225                             uses these opts to set flags, and the flags are read
1226                             by the kernel vfs layer before we get here (ie
1227                             before read super) so there is no point trying to
1228                             parse these options again and set anything and it
1229                             is ok to just ignore them */
1230                         continue;
1231                 } else if (strnicmp(data, "hard", 4) == 0) {
1232                         vol->retry = 1;
1233                 } else if (strnicmp(data, "soft", 4) == 0) {
1234                         vol->retry = 0;
1235                 } else if (strnicmp(data, "perm", 4) == 0) {
1236                         vol->noperm = 0;
1237                 } else if (strnicmp(data, "noperm", 6) == 0) {
1238                         vol->noperm = 1;
1239                 } else if (strnicmp(data, "mapchars", 8) == 0) {
1240                         vol->remap = 1;
1241                 } else if (strnicmp(data, "nomapchars", 10) == 0) {
1242                         vol->remap = 0;
1243                 } else if (strnicmp(data, "sfu", 3) == 0) {
1244                         vol->sfu_emul = 1;
1245                 } else if (strnicmp(data, "nosfu", 5) == 0) {
1246                         vol->sfu_emul = 0;
1247                 } else if (strnicmp(data, "nodfs", 5) == 0) {
1248                         vol->nodfs = 1;
1249                 } else if (strnicmp(data, "posixpaths", 10) == 0) {
1250                         vol->posix_paths = 1;
1251                 } else if (strnicmp(data, "noposixpaths", 12) == 0) {
1252                         vol->posix_paths = 0;
1253                 } else if (strnicmp(data, "nounix", 6) == 0) {
1254                         vol->no_linux_ext = 1;
1255                 } else if (strnicmp(data, "nolinux", 7) == 0) {
1256                         vol->no_linux_ext = 1;
1257                 } else if ((strnicmp(data, "nocase", 6) == 0) ||
1258                            (strnicmp(data, "ignorecase", 10)  == 0)) {
1259                         vol->nocase = 1;
1260                 } else if (strnicmp(data, "brl", 3) == 0) {
1261                         vol->nobrl =  0;
1262                 } else if ((strnicmp(data, "nobrl", 5) == 0) ||
1263                            (strnicmp(data, "nolock", 6) == 0)) {
1264                         vol->nobrl =  1;
1265                         /* turn off mandatory locking in mode
1266                         if remote locking is turned off since the
1267                         local vfs will do advisory */
1268                         if (vol->file_mode ==
1269                                 (S_IALLUGO & ~(S_ISUID | S_IXGRP)))
1270                                 vol->file_mode = S_IALLUGO;
1271                 } else if (strnicmp(data, "forcemandatorylock", 9) == 0) {
1272                         /* will take the shorter form "forcemand" as well */
1273                         /* This mount option will force use of mandatory
1274                           (DOS/Windows style) byte range locks, instead of
1275                           using posix advisory byte range locks, even if the
1276                           Unix extensions are available and posix locks would
1277                           be supported otherwise. If Unix extensions are not
1278                           negotiated this has no effect since mandatory locks
1279                           would be used (mandatory locks is all that those
1280                           those servers support) */
1281                         vol->mand_lock = 1;
1282                 } else if (strnicmp(data, "setuids", 7) == 0) {
1283                         vol->setuids = 1;
1284                 } else if (strnicmp(data, "nosetuids", 9) == 0) {
1285                         vol->setuids = 0;
1286                 } else if (strnicmp(data, "dynperm", 7) == 0) {
1287                         vol->dynperm = true;
1288                 } else if (strnicmp(data, "nodynperm", 9) == 0) {
1289                         vol->dynperm = false;
1290                 } else if (strnicmp(data, "nohard", 6) == 0) {
1291                         vol->retry = 0;
1292                 } else if (strnicmp(data, "nosoft", 6) == 0) {
1293                         vol->retry = 1;
1294                 } else if (strnicmp(data, "nointr", 6) == 0) {
1295                         vol->intr = 0;
1296                 } else if (strnicmp(data, "intr", 4) == 0) {
1297                         vol->intr = 1;
1298                 } else if (strnicmp(data, "nostrictsync", 12) == 0) {
1299                         vol->nostrictsync = 1;
1300                 } else if (strnicmp(data, "strictsync", 10) == 0) {
1301                         vol->nostrictsync = 0;
1302                 } else if (strnicmp(data, "serverino", 7) == 0) {
1303                         vol->server_ino = 1;
1304                 } else if (strnicmp(data, "noserverino", 9) == 0) {
1305                         vol->server_ino = 0;
1306                 } else if (strnicmp(data, "cifsacl", 7) == 0) {
1307                         vol->cifs_acl = 1;
1308                 } else if (strnicmp(data, "nocifsacl", 9) == 0) {
1309                         vol->cifs_acl = 0;
1310                 } else if (strnicmp(data, "acl", 3) == 0) {
1311                         vol->no_psx_acl = 0;
1312                 } else if (strnicmp(data, "noacl", 5) == 0) {
1313                         vol->no_psx_acl = 1;
1314 #ifdef CONFIG_CIFS_EXPERIMENTAL
1315                 } else if (strnicmp(data, "locallease", 6) == 0) {
1316                         vol->local_lease = 1;
1317 #endif
1318                 } else if (strnicmp(data, "sign", 4) == 0) {
1319                         vol->secFlg |= CIFSSEC_MUST_SIGN;
1320                 } else if (strnicmp(data, "seal", 4) == 0) {
1321                         /* we do not do the following in secFlags because seal
1322                            is a per tree connection (mount) not a per socket
1323                            or per-smb connection option in the protocol */
1324                         /* vol->secFlg |= CIFSSEC_MUST_SEAL; */
1325                         vol->seal = 1;
1326                 } else if (strnicmp(data, "direct", 6) == 0) {
1327                         vol->direct_io = 1;
1328                 } else if (strnicmp(data, "forcedirectio", 13) == 0) {
1329                         vol->direct_io = 1;
1330                 } else if (strnicmp(data, "noac", 4) == 0) {
1331                         printk(KERN_WARNING "CIFS: Mount option noac not "
1332                                 "supported. Instead set "
1333                                 "/proc/fs/cifs/LookupCacheEnabled to 0\n");
1334                 } else
1335                         printk(KERN_WARNING "CIFS: Unknown mount option %s\n",
1336                                                 data);
1337         }
1338         if (vol->UNC == NULL) {
1339                 if (devname == NULL) {
1340                         printk(KERN_WARNING "CIFS: Missing UNC name for mount "
1341                                                 "target\n");
1342                         return 1;
1343                 }
1344                 if ((temp_len = strnlen(devname, 300)) < 300) {
1345                         vol->UNC = kmalloc(temp_len+1, GFP_KERNEL);
1346                         if (vol->UNC == NULL)
1347                                 return 1;
1348                         strcpy(vol->UNC, devname);
1349                         if (strncmp(vol->UNC, "//", 2) == 0) {
1350                                 vol->UNC[0] = '\\';
1351                                 vol->UNC[1] = '\\';
1352                         } else if (strncmp(vol->UNC, "\\\\", 2) != 0) {
1353                                 printk(KERN_WARNING "CIFS: UNC Path does not "
1354                                                     "begin with // or \\\\ \n");
1355                                 return 1;
1356                         }
1357                         value = strpbrk(vol->UNC+2, "/\\");
1358                         if (value)
1359                                 *value = '\\';
1360                 } else {
1361                         printk(KERN_WARNING "CIFS: UNC name too long\n");
1362                         return 1;
1363                 }
1364         }
1365         if (vol->UNCip == NULL)
1366                 vol->UNCip = &vol->UNC[2];
1367
1368         if (uid_specified)
1369                 vol->override_uid = override_uid;
1370         else if (override_uid == 1)
1371                 printk(KERN_NOTICE "CIFS: ignoring forceuid mount option "
1372                                    "specified with no uid= option.\n");
1373
1374         if (gid_specified)
1375                 vol->override_gid = override_gid;
1376         else if (override_gid == 1)
1377                 printk(KERN_NOTICE "CIFS: ignoring forcegid mount option "
1378                                    "specified with no gid= option.\n");
1379
1380         return 0;
1381 }
1382
1383 static struct TCP_Server_Info *
1384 cifs_find_tcp_session(struct sockaddr_storage *addr, unsigned short int port)
1385 {
1386         struct list_head *tmp;
1387         struct TCP_Server_Info *server;
1388         struct sockaddr_in *addr4 = (struct sockaddr_in *) addr;
1389         struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *) addr;
1390
1391         write_lock(&cifs_tcp_ses_lock);
1392         list_for_each(tmp, &cifs_tcp_ses_list) {
1393                 server = list_entry(tmp, struct TCP_Server_Info,
1394                                     tcp_ses_list);
1395                 /*
1396                  * the demux thread can exit on its own while still in CifsNew
1397                  * so don't accept any sockets in that state. Since the
1398                  * tcpStatus never changes back to CifsNew it's safe to check
1399                  * for this without a lock.
1400                  */
1401                 if (server->tcpStatus == CifsNew)
1402                         continue;
1403
1404                 switch (addr->ss_family) {
1405                 case AF_INET:
1406                         if (addr4->sin_addr.s_addr ==
1407                             server->addr.sockAddr.sin_addr.s_addr) {
1408                                 addr4->sin_port = htons(port);
1409                                 /* user overrode default port? */
1410                                 if (addr4->sin_port) {
1411                                         if (addr4->sin_port !=
1412                                             server->addr.sockAddr.sin_port)
1413                                                 continue;
1414                                 }
1415                                 break;
1416                         } else
1417                                 continue;
1418
1419                 case AF_INET6:
1420                         if (ipv6_addr_equal(&addr6->sin6_addr,
1421                             &server->addr.sockAddr6.sin6_addr) &&
1422                             (addr6->sin6_scope_id ==
1423                             server->addr.sockAddr6.sin6_scope_id)) {
1424                                 addr6->sin6_port = htons(port);
1425                                 /* user overrode default port? */
1426                                 if (addr6->sin6_port) {
1427                                         if (addr6->sin6_port !=
1428                                            server->addr.sockAddr6.sin6_port)
1429                                                 continue;
1430                                 }
1431                                 break;
1432                         } else
1433                                 continue;
1434                 }
1435
1436                 ++server->srv_count;
1437                 write_unlock(&cifs_tcp_ses_lock);
1438                 cFYI(1, "Existing tcp session with server found");
1439                 return server;
1440         }
1441         write_unlock(&cifs_tcp_ses_lock);
1442         return NULL;
1443 }
1444
1445 static void
1446 cifs_put_tcp_session(struct TCP_Server_Info *server)
1447 {
1448         struct task_struct *task;
1449
1450         write_lock(&cifs_tcp_ses_lock);
1451         if (--server->srv_count > 0) {
1452                 write_unlock(&cifs_tcp_ses_lock);
1453                 return;
1454         }
1455
1456         list_del_init(&server->tcp_ses_list);
1457         write_unlock(&cifs_tcp_ses_lock);
1458
1459         spin_lock(&GlobalMid_Lock);
1460         server->tcpStatus = CifsExiting;
1461         spin_unlock(&GlobalMid_Lock);
1462
1463         task = xchg(&server->tsk, NULL);
1464         if (task)
1465                 force_sig(SIGKILL, task);
1466 }
1467
1468 static struct TCP_Server_Info *
1469 cifs_get_tcp_session(struct smb_vol *volume_info)
1470 {
1471         struct TCP_Server_Info *tcp_ses = NULL;
1472         struct sockaddr_storage addr;
1473         struct sockaddr_in *sin_server = (struct sockaddr_in *) &addr;
1474         struct sockaddr_in6 *sin_server6 = (struct sockaddr_in6 *) &addr;
1475         int rc;
1476
1477         memset(&addr, 0, sizeof(struct sockaddr_storage));
1478
1479         cFYI(1, "UNC: %s ip: %s", volume_info->UNC, volume_info->UNCip);
1480
1481         if (volume_info->UNCip && volume_info->UNC) {
1482                 rc = cifs_convert_address(volume_info->UNCip, &addr);
1483                 if (!rc) {
1484                         /* we failed translating address */
1485                         rc = -EINVAL;
1486                         goto out_err;
1487                 }
1488         } else if (volume_info->UNCip) {
1489                 /* BB using ip addr as tcp_ses name to connect to the
1490                    DFS root below */
1491                 cERROR(1, "Connecting to DFS root not implemented yet");
1492                 rc = -EINVAL;
1493                 goto out_err;
1494         } else /* which tcp_sess DFS root would we conect to */ {
1495                 cERROR(1, "CIFS mount error: No UNC path (e.g. -o "
1496                         "unc=//192.168.1.100/public) specified");
1497                 rc = -EINVAL;
1498                 goto out_err;
1499         }
1500
1501         /* see if we already have a matching tcp_ses */
1502         tcp_ses = cifs_find_tcp_session(&addr, volume_info->port);
1503         if (tcp_ses)
1504                 return tcp_ses;
1505
1506         tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
1507         if (!tcp_ses) {
1508                 rc = -ENOMEM;
1509                 goto out_err;
1510         }
1511
1512         tcp_ses->hostname = extract_hostname(volume_info->UNC);
1513         if (IS_ERR(tcp_ses->hostname)) {
1514                 rc = PTR_ERR(tcp_ses->hostname);
1515                 goto out_err;
1516         }
1517
1518         tcp_ses->noblocksnd = volume_info->noblocksnd;
1519         tcp_ses->noautotune = volume_info->noautotune;
1520         tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
1521         atomic_set(&tcp_ses->inFlight, 0);
1522         init_waitqueue_head(&tcp_ses->response_q);
1523         init_waitqueue_head(&tcp_ses->request_q);
1524         INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
1525         mutex_init(&tcp_ses->srv_mutex);
1526         memcpy(tcp_ses->workstation_RFC1001_name,
1527                 volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1528         memcpy(tcp_ses->server_RFC1001_name,
1529                 volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
1530         tcp_ses->sequence_number = 0;
1531         INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
1532         INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
1533
1534         /*
1535          * at this point we are the only ones with the pointer
1536          * to the struct since the kernel thread not created yet
1537          * no need to spinlock this init of tcpStatus or srv_count
1538          */
1539         tcp_ses->tcpStatus = CifsNew;
1540         ++tcp_ses->srv_count;
1541
1542         if (addr.ss_family == AF_INET6) {
1543                 cFYI(1, "attempting ipv6 connect");
1544                 /* BB should we allow ipv6 on port 139? */
1545                 /* other OS never observed in Wild doing 139 with v6 */
1546                 sin_server6->sin6_port = htons(volume_info->port);
1547                 memcpy(&tcp_ses->addr.sockAddr6, sin_server6,
1548                         sizeof(struct sockaddr_in6));
1549                 rc = ipv6_connect(tcp_ses);
1550         } else {
1551                 sin_server->sin_port = htons(volume_info->port);
1552                 memcpy(&tcp_ses->addr.sockAddr, sin_server,
1553                         sizeof(struct sockaddr_in));
1554                 rc = ipv4_connect(tcp_ses);
1555         }
1556         if (rc < 0) {
1557                 cERROR(1, "Error connecting to socket. Aborting operation");
1558                 goto out_err;
1559         }
1560
1561         /*
1562          * since we're in a cifs function already, we know that
1563          * this will succeed. No need for try_module_get().
1564          */
1565         __module_get(THIS_MODULE);
1566         tcp_ses->tsk = kthread_run((void *)(void *)cifs_demultiplex_thread,
1567                                   tcp_ses, "cifsd");
1568         if (IS_ERR(tcp_ses->tsk)) {
1569                 rc = PTR_ERR(tcp_ses->tsk);
1570                 cERROR(1, "error %d create cifsd thread", rc);
1571                 module_put(THIS_MODULE);
1572                 goto out_err;
1573         }
1574
1575         /* thread spawned, put it on the list */
1576         write_lock(&cifs_tcp_ses_lock);
1577         list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
1578         write_unlock(&cifs_tcp_ses_lock);
1579
1580         return tcp_ses;
1581
1582 out_err:
1583         if (tcp_ses) {
1584                 if (!IS_ERR(tcp_ses->hostname))
1585                         kfree(tcp_ses->hostname);
1586                 if (tcp_ses->ssocket)
1587                         sock_release(tcp_ses->ssocket);
1588                 kfree(tcp_ses);
1589         }
1590         return ERR_PTR(rc);
1591 }
1592
1593 static struct cifsSesInfo *
1594 cifs_find_smb_ses(struct TCP_Server_Info *server, char *username)
1595 {
1596         struct list_head *tmp;
1597         struct cifsSesInfo *ses;
1598
1599         write_lock(&cifs_tcp_ses_lock);
1600         list_for_each(tmp, &server->smb_ses_list) {
1601                 ses = list_entry(tmp, struct cifsSesInfo, smb_ses_list);
1602                 if (strncmp(ses->userName, username, MAX_USERNAME_SIZE))
1603                         continue;
1604
1605                 ++ses->ses_count;
1606                 write_unlock(&cifs_tcp_ses_lock);
1607                 return ses;
1608         }
1609         write_unlock(&cifs_tcp_ses_lock);
1610         return NULL;
1611 }
1612
1613 static void
1614 cifs_put_smb_ses(struct cifsSesInfo *ses)
1615 {
1616         int xid;
1617         struct TCP_Server_Info *server = ses->server;
1618
1619         cFYI(1, "%s: ses_count=%d\n", __func__, ses->ses_count);
1620         write_lock(&cifs_tcp_ses_lock);
1621         if (--ses->ses_count > 0) {
1622                 write_unlock(&cifs_tcp_ses_lock);
1623                 return;
1624         }
1625
1626         list_del_init(&ses->smb_ses_list);
1627         write_unlock(&cifs_tcp_ses_lock);
1628
1629         if (ses->status == CifsGood) {
1630                 xid = GetXid();
1631                 CIFSSMBLogoff(xid, ses);
1632                 _FreeXid(xid);
1633         }
1634         sesInfoFree(ses);
1635         cifs_put_tcp_session(server);
1636 }
1637
1638 static struct cifsSesInfo *
1639 cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
1640 {
1641         int rc = -ENOMEM, xid;
1642         struct cifsSesInfo *ses;
1643
1644         xid = GetXid();
1645
1646         ses = cifs_find_smb_ses(server, volume_info->username);
1647         if (ses) {
1648                 cFYI(1, "Existing smb sess found (status=%d)", ses->status);
1649
1650                 /* existing SMB ses has a server reference already */
1651                 cifs_put_tcp_session(server);
1652
1653                 mutex_lock(&ses->session_mutex);
1654                 if (ses->need_reconnect) {
1655                         cFYI(1, "Session needs reconnect");
1656                         rc = cifs_setup_session(xid, ses,
1657                                                 volume_info->local_nls);
1658                         if (rc) {
1659                                 mutex_unlock(&ses->session_mutex);
1660                                 /* problem -- put our reference */
1661                                 cifs_put_smb_ses(ses);
1662                                 FreeXid(xid);
1663                                 return ERR_PTR(rc);
1664                         }
1665                 }
1666                 mutex_unlock(&ses->session_mutex);
1667                 FreeXid(xid);
1668                 return ses;
1669         }
1670
1671         cFYI(1, "Existing smb sess not found");
1672         ses = sesInfoAlloc();
1673         if (ses == NULL)
1674                 goto get_ses_fail;
1675
1676         /* new SMB session uses our server ref */
1677         ses->server = server;
1678         if (server->addr.sockAddr6.sin6_family == AF_INET6)
1679                 sprintf(ses->serverName, "%pI6",
1680                         &server->addr.sockAddr6.sin6_addr);
1681         else
1682                 sprintf(ses->serverName, "%pI4",
1683                         &server->addr.sockAddr.sin_addr.s_addr);
1684
1685         if (volume_info->username)
1686                 strncpy(ses->userName, volume_info->username,
1687                         MAX_USERNAME_SIZE);
1688
1689         /* volume_info->password freed at unmount */
1690         if (volume_info->password) {
1691                 ses->password = kstrdup(volume_info->password, GFP_KERNEL);
1692                 if (!ses->password)
1693                         goto get_ses_fail;
1694         }
1695         if (volume_info->domainname) {
1696                 int len = strlen(volume_info->domainname);
1697                 ses->domainName = kmalloc(len + 1, GFP_KERNEL);
1698                 if (ses->domainName)
1699                         strcpy(ses->domainName, volume_info->domainname);
1700         }
1701         ses->linux_uid = volume_info->linux_uid;
1702         ses->overrideSecFlg = volume_info->secFlg;
1703
1704         mutex_lock(&ses->session_mutex);
1705         rc = cifs_setup_session(xid, ses, volume_info->local_nls);
1706         mutex_unlock(&ses->session_mutex);
1707         if (rc)
1708                 goto get_ses_fail;
1709
1710         /* success, put it on the list */
1711         write_lock(&cifs_tcp_ses_lock);
1712         list_add(&ses->smb_ses_list, &server->smb_ses_list);
1713         write_unlock(&cifs_tcp_ses_lock);
1714
1715         FreeXid(xid);
1716         return ses;
1717
1718 get_ses_fail:
1719         sesInfoFree(ses);
1720         FreeXid(xid);
1721         return ERR_PTR(rc);
1722 }
1723
1724 static struct cifsTconInfo *
1725 cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
1726 {
1727         struct list_head *tmp;
1728         struct cifsTconInfo *tcon;
1729
1730         write_lock(&cifs_tcp_ses_lock);
1731         list_for_each(tmp, &ses->tcon_list) {
1732                 tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
1733                 if (tcon->tidStatus == CifsExiting)
1734                         continue;
1735                 if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
1736                         continue;
1737
1738                 ++tcon->tc_count;
1739                 write_unlock(&cifs_tcp_ses_lock);
1740                 return tcon;
1741         }
1742         write_unlock(&cifs_tcp_ses_lock);
1743         return NULL;
1744 }
1745
1746 static void
1747 cifs_put_tcon(struct cifsTconInfo *tcon)
1748 {
1749         int xid;
1750         struct cifsSesInfo *ses = tcon->ses;
1751
1752         write_lock(&cifs_tcp_ses_lock);
1753         if (--tcon->tc_count > 0) {
1754                 write_unlock(&cifs_tcp_ses_lock);
1755                 return;
1756         }
1757
1758         list_del_init(&tcon->tcon_list);
1759         write_unlock(&cifs_tcp_ses_lock);
1760
1761         xid = GetXid();
1762         CIFSSMBTDis(xid, tcon);
1763         _FreeXid(xid);
1764
1765         tconInfoFree(tcon);
1766         cifs_put_smb_ses(ses);
1767 }
1768
1769 int
1770 get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
1771              const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
1772              struct dfs_info3_param **preferrals, int remap)
1773 {
1774         char *temp_unc;
1775         int rc = 0;
1776
1777         *pnum_referrals = 0;
1778         *preferrals = NULL;
1779
1780         if (pSesInfo->ipc_tid == 0) {
1781                 temp_unc = kmalloc(2 /* for slashes */ +
1782                         strnlen(pSesInfo->serverName,
1783                                 SERVER_NAME_LEN_WITH_NULL * 2)
1784                                  + 1 + 4 /* slash IPC$ */  + 2,
1785                                 GFP_KERNEL);
1786                 if (temp_unc == NULL)
1787                         return -ENOMEM;
1788                 temp_unc[0] = '\\';
1789                 temp_unc[1] = '\\';
1790                 strcpy(temp_unc + 2, pSesInfo->serverName);
1791                 strcpy(temp_unc + 2 + strlen(pSesInfo->serverName), "\\IPC$");
1792                 rc = CIFSTCon(xid, pSesInfo, temp_unc, NULL, nls_codepage);
1793                 cFYI(1, "CIFS Tcon rc = %d ipc_tid = %d", rc, pSesInfo->ipc_tid);
1794                 kfree(temp_unc);
1795         }
1796         if (rc == 0)
1797                 rc = CIFSGetDFSRefer(xid, pSesInfo, old_path, preferrals,
1798                                      pnum_referrals, nls_codepage, remap);
1799         /* BB map targetUNCs to dfs_info3 structures, here or
1800                 in CIFSGetDFSRefer BB */
1801
1802         return rc;
1803 }
1804
1805 #ifdef CONFIG_DEBUG_LOCK_ALLOC
1806 static struct lock_class_key cifs_key[2];
1807 static struct lock_class_key cifs_slock_key[2];
1808
1809 static inline void
1810 cifs_reclassify_socket4(struct socket *sock)
1811 {
1812         struct sock *sk = sock->sk;
1813         BUG_ON(sock_owned_by_user(sk));
1814         sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
1815                 &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
1816 }
1817
1818 static inline void
1819 cifs_reclassify_socket6(struct socket *sock)
1820 {
1821         struct sock *sk = sock->sk;
1822         BUG_ON(sock_owned_by_user(sk));
1823         sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
1824                 &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
1825 }
1826 #else
1827 static inline void
1828 cifs_reclassify_socket4(struct socket *sock)
1829 {
1830 }
1831
1832 static inline void
1833 cifs_reclassify_socket6(struct socket *sock)
1834 {
1835 }
1836 #endif
1837
1838 /* See RFC1001 section 14 on representation of Netbios names */
1839 static void rfc1002mangle(char *target, char *source, unsigned int length)
1840 {
1841         unsigned int i, j;
1842
1843         for (i = 0, j = 0; i < (length); i++) {
1844                 /* mask a nibble at a time and encode */
1845                 target[j] = 'A' + (0x0F & (source[i] >> 4));
1846                 target[j+1] = 'A' + (0x0F & source[i]);
1847                 j += 2;
1848         }
1849
1850 }
1851
1852
1853 static int
1854 ipv4_connect(struct TCP_Server_Info *server)
1855 {
1856         int rc = 0;
1857         int val;
1858         bool connected = false;
1859         __be16 orig_port = 0;
1860         struct socket *socket = server->ssocket;
1861
1862         if (socket == NULL) {
1863                 rc = sock_create_kern(PF_INET, SOCK_STREAM,
1864                                       IPPROTO_TCP, &socket);
1865                 if (rc < 0) {
1866                         cERROR(1, "Error %d creating socket", rc);
1867                         return rc;
1868                 }
1869
1870                 /* BB other socket options to set KEEPALIVE, NODELAY? */
1871                 cFYI(1, "Socket created");
1872                 server->ssocket = socket;
1873                 socket->sk->sk_allocation = GFP_NOFS;
1874                 cifs_reclassify_socket4(socket);
1875         }
1876
1877         /* user overrode default port */
1878         if (server->addr.sockAddr.sin_port) {
1879                 rc = socket->ops->connect(socket, (struct sockaddr *)
1880                                           &server->addr.sockAddr,
1881                                           sizeof(struct sockaddr_in), 0);
1882                 if (rc >= 0)
1883                         connected = true;
1884         }
1885
1886         if (!connected) {
1887                 /* save original port so we can retry user specified port
1888                         later if fall back ports fail this time  */
1889                 orig_port = server->addr.sockAddr.sin_port;
1890
1891                 /* do not retry on the same port we just failed on */
1892                 if (server->addr.sockAddr.sin_port != htons(CIFS_PORT)) {
1893                         server->addr.sockAddr.sin_port = htons(CIFS_PORT);
1894                         rc = socket->ops->connect(socket,
1895                                                 (struct sockaddr *)
1896                                                 &server->addr.sockAddr,
1897                                                 sizeof(struct sockaddr_in), 0);
1898                         if (rc >= 0)
1899                                 connected = true;
1900                 }
1901         }
1902         if (!connected) {
1903                 server->addr.sockAddr.sin_port = htons(RFC1001_PORT);
1904                 rc = socket->ops->connect(socket, (struct sockaddr *)
1905                                               &server->addr.sockAddr,
1906                                               sizeof(struct sockaddr_in), 0);
1907                 if (rc >= 0)
1908                         connected = true;
1909         }
1910
1911         /* give up here - unless we want to retry on different
1912                 protocol families some day */
1913         if (!connected) {
1914                 if (orig_port)
1915                         server->addr.sockAddr.sin_port = orig_port;
1916                 cFYI(1, "Error %d connecting to server via ipv4", rc);
1917                 sock_release(socket);
1918                 server->ssocket = NULL;
1919                 return rc;
1920         }
1921
1922
1923         /*
1924          * Eventually check for other socket options to change from
1925          *  the default. sock_setsockopt not used because it expects
1926          *  user space buffer
1927          */
1928         socket->sk->sk_rcvtimeo = 7 * HZ;
1929         socket->sk->sk_sndtimeo = 5 * HZ;
1930
1931         /* make the bufsizes depend on wsize/rsize and max requests */
1932         if (server->noautotune) {
1933                 if (socket->sk->sk_sndbuf < (200 * 1024))
1934                         socket->sk->sk_sndbuf = 200 * 1024;
1935                 if (socket->sk->sk_rcvbuf < (140 * 1024))
1936                         socket->sk->sk_rcvbuf = 140 * 1024;
1937         }
1938
1939         if (server->tcp_nodelay) {
1940                 val = 1;
1941                 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
1942                                 (char *)&val, sizeof(val));
1943                 if (rc)
1944                         cFYI(1, "set TCP_NODELAY socket option error %d", rc);
1945         }
1946
1947          cFYI(1, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx",
1948                  socket->sk->sk_sndbuf,
1949                  socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
1950
1951         /* send RFC1001 sessinit */
1952         if (server->addr.sockAddr.sin_port == htons(RFC1001_PORT)) {
1953                 /* some servers require RFC1001 sessinit before sending
1954                 negprot - BB check reconnection in case where second
1955                 sessinit is sent but no second negprot */
1956                 struct rfc1002_session_packet *ses_init_buf;
1957                 struct smb_hdr *smb_buf;
1958                 ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
1959                                        GFP_KERNEL);
1960                 if (ses_init_buf) {
1961                         ses_init_buf->trailer.session_req.called_len = 32;
1962                         if (server->server_RFC1001_name &&
1963                             server->server_RFC1001_name[0] != 0)
1964                                 rfc1002mangle(ses_init_buf->trailer.
1965                                                 session_req.called_name,
1966                                               server->server_RFC1001_name,
1967                                               RFC1001_NAME_LEN_WITH_NULL);
1968                         else
1969                                 rfc1002mangle(ses_init_buf->trailer.
1970                                                 session_req.called_name,
1971                                               DEFAULT_CIFS_CALLED_NAME,
1972                                               RFC1001_NAME_LEN_WITH_NULL);
1973
1974                         ses_init_buf->trailer.session_req.calling_len = 32;
1975
1976                         /* calling name ends in null (byte 16) from old smb
1977                         convention. */
1978                         if (server->workstation_RFC1001_name &&
1979                             server->workstation_RFC1001_name[0] != 0)
1980                                 rfc1002mangle(ses_init_buf->trailer.
1981                                                 session_req.calling_name,
1982                                               server->workstation_RFC1001_name,
1983                                               RFC1001_NAME_LEN_WITH_NULL);
1984                         else
1985                                 rfc1002mangle(ses_init_buf->trailer.
1986                                                 session_req.calling_name,
1987                                               "LINUX_CIFS_CLNT",
1988                                               RFC1001_NAME_LEN_WITH_NULL);
1989
1990                         ses_init_buf->trailer.session_req.scope1 = 0;
1991                         ses_init_buf->trailer.session_req.scope2 = 0;
1992                         smb_buf = (struct smb_hdr *)ses_init_buf;
1993                         /* sizeof RFC1002_SESSION_REQUEST with no scope */
1994                         smb_buf->smb_buf_length = 0x81000044;
1995                         rc = smb_send(server, smb_buf, 0x44);
1996                         kfree(ses_init_buf);
1997                         msleep(1); /* RFC1001 layer in at least one server
1998                                       requires very short break before negprot
1999                                       presumably because not expecting negprot
2000                                       to follow so fast.  This is a simple
2001                                       solution that works without
2002                                       complicating the code and causes no
2003                                       significant slowing down on mount
2004                                       for everyone else */
2005                 }
2006                 /* else the negprot may still work without this
2007                 even though malloc failed */
2008
2009         }
2010
2011         return rc;
2012 }
2013
2014 static int
2015 ipv6_connect(struct TCP_Server_Info *server)
2016 {
2017         int rc = 0;
2018         int val;
2019         bool connected = false;
2020         __be16 orig_port = 0;
2021         struct socket *socket = server->ssocket;
2022
2023         if (socket == NULL) {
2024                 rc = sock_create_kern(PF_INET6, SOCK_STREAM,
2025                                       IPPROTO_TCP, &socket);
2026                 if (rc < 0) {
2027                         cERROR(1, "Error %d creating ipv6 socket", rc);
2028                         socket = NULL;
2029                         return rc;
2030                 }
2031
2032                 /* BB other socket options to set KEEPALIVE, NODELAY? */
2033                 cFYI(1, "ipv6 Socket created");
2034                 server->ssocket = socket;
2035                 socket->sk->sk_allocation = GFP_NOFS;
2036                 cifs_reclassify_socket6(socket);
2037         }
2038
2039         /* user overrode default port */
2040         if (server->addr.sockAddr6.sin6_port) {
2041                 rc = socket->ops->connect(socket,
2042                                 (struct sockaddr *) &server->addr.sockAddr6,
2043                                 sizeof(struct sockaddr_in6), 0);
2044                 if (rc >= 0)
2045                         connected = true;
2046         }
2047
2048         if (!connected) {
2049                 /* save original port so we can retry user specified port
2050                         later if fall back ports fail this time  */
2051
2052                 orig_port = server->addr.sockAddr6.sin6_port;
2053                 /* do not retry on the same port we just failed on */
2054                 if (server->addr.sockAddr6.sin6_port != htons(CIFS_PORT)) {
2055                         server->addr.sockAddr6.sin6_port = htons(CIFS_PORT);
2056                         rc = socket->ops->connect(socket, (struct sockaddr *)
2057                                         &server->addr.sockAddr6,
2058                                         sizeof(struct sockaddr_in6), 0);
2059                         if (rc >= 0)
2060                                 connected = true;
2061                 }
2062         }
2063         if (!connected) {
2064                 server->addr.sockAddr6.sin6_port = htons(RFC1001_PORT);
2065                 rc = socket->ops->connect(socket, (struct sockaddr *)
2066                                 &server->addr.sockAddr6,
2067                                 sizeof(struct sockaddr_in6), 0);
2068                 if (rc >= 0)
2069                         connected = true;
2070         }
2071
2072         /* give up here - unless we want to retry on different
2073                 protocol families some day */
2074         if (!connected) {
2075                 if (orig_port)
2076                         server->addr.sockAddr6.sin6_port = orig_port;
2077                 cFYI(1, "Error %d connecting to server via ipv6", rc);
2078                 sock_release(socket);
2079                 server->ssocket = NULL;
2080                 return rc;
2081         }
2082
2083         /*
2084          * Eventually check for other socket options to change from
2085          * the default. sock_setsockopt not used because it expects
2086          * user space buffer
2087          */
2088         socket->sk->sk_rcvtimeo = 7 * HZ;
2089         socket->sk->sk_sndtimeo = 5 * HZ;
2090
2091         if (server->tcp_nodelay) {
2092                 val = 1;
2093                 rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
2094                                 (char *)&val, sizeof(val));
2095                 if (rc)
2096                         cFYI(1, "set TCP_NODELAY socket option error %d", rc);
2097         }
2098
2099         server->ssocket = socket;
2100
2101         return rc;
2102 }
2103
2104 void reset_cifs_unix_caps(int xid, struct cifsTconInfo *tcon,
2105                           struct super_block *sb, struct smb_vol *vol_info)
2106 {
2107         /* if we are reconnecting then should we check to see if
2108          * any requested capabilities changed locally e.g. via
2109          * remount but we can not do much about it here
2110          * if they have (even if we could detect it by the following)
2111          * Perhaps we could add a backpointer to array of sb from tcon
2112          * or if we change to make all sb to same share the same
2113          * sb as NFS - then we only have one backpointer to sb.
2114          * What if we wanted to mount the server share twice once with
2115          * and once without posixacls or posix paths? */
2116         __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2117
2118         if (vol_info && vol_info->no_linux_ext) {
2119                 tcon->fsUnixInfo.Capability = 0;
2120                 tcon->unix_ext = 0; /* Unix Extensions disabled */
2121                 cFYI(1, "Linux protocol extensions disabled");
2122                 return;
2123         } else if (vol_info)
2124                 tcon->unix_ext = 1; /* Unix Extensions supported */
2125
2126         if (tcon->unix_ext == 0) {
2127                 cFYI(1, "Unix extensions disabled so not set on reconnect");
2128                 return;
2129         }
2130
2131         if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
2132                 __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
2133
2134                 /* check for reconnect case in which we do not
2135                    want to change the mount behavior if we can avoid it */
2136                 if (vol_info == NULL) {
2137                         /* turn off POSIX ACL and PATHNAMES if not set
2138                            originally at mount time */
2139                         if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
2140                                 cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2141                         if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2142                                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2143                                         cERROR(1, "POSIXPATH support change");
2144                                 cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2145                         } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
2146                                 cERROR(1, "possible reconnect error");
2147                                 cERROR(1, "server disabled POSIX path support");
2148                         }
2149                 }
2150
2151                 cap &= CIFS_UNIX_CAP_MASK;
2152                 if (vol_info && vol_info->no_psx_acl)
2153                         cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
2154                 else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
2155                         cFYI(1, "negotiated posix acl support");
2156                         if (sb)
2157                                 sb->s_flags |= MS_POSIXACL;
2158                 }
2159
2160                 if (vol_info && vol_info->posix_paths == 0)
2161                         cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
2162                 else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
2163                         cFYI(1, "negotiate posix pathnames");
2164                         if (sb)
2165                                 CIFS_SB(sb)->mnt_cifs_flags |=
2166                                         CIFS_MOUNT_POSIX_PATHS;
2167                 }
2168
2169                 /* We might be setting the path sep back to a different
2170                 form if we are reconnecting and the server switched its
2171                 posix path capability for this share */
2172                 if (sb && (CIFS_SB(sb)->prepathlen > 0))
2173                         CIFS_SB(sb)->prepath[0] = CIFS_DIR_SEP(CIFS_SB(sb));
2174
2175                 if (sb && (CIFS_SB(sb)->rsize > 127 * 1024)) {
2176                         if ((cap & CIFS_UNIX_LARGE_READ_CAP) == 0) {
2177                                 CIFS_SB(sb)->rsize = 127 * 1024;
2178                                 cFYI(DBG2, "larger reads not supported by srv");
2179                         }
2180                 }
2181
2182
2183                 cFYI(1, "Negotiate caps 0x%x", (int)cap);
2184 #ifdef CONFIG_CIFS_DEBUG2
2185                 if (cap & CIFS_UNIX_FCNTL_CAP)
2186                         cFYI(1, "FCNTL cap");
2187                 if (cap & CIFS_UNIX_EXTATTR_CAP)
2188                         cFYI(1, "EXTATTR cap");
2189                 if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
2190                         cFYI(1, "POSIX path cap");
2191                 if (cap & CIFS_UNIX_XATTR_CAP)
2192                         cFYI(1, "XATTR cap");
2193                 if (cap & CIFS_UNIX_POSIX_ACL_CAP)
2194                         cFYI(1, "POSIX ACL cap");
2195                 if (cap & CIFS_UNIX_LARGE_READ_CAP)
2196                         cFYI(1, "very large read cap");
2197                 if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
2198                         cFYI(1, "very large write cap");
2199 #endif /* CIFS_DEBUG2 */
2200                 if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
2201                         if (vol_info == NULL) {
2202                                 cFYI(1, "resetting capabilities failed");
2203                         } else
2204                                 cERROR(1, "Negotiating Unix capabilities "
2205                                            "with the server failed.  Consider "
2206                                            "mounting with the Unix Extensions\n"
2207                                            "disabled, if problems are found, "
2208                                            "by specifying the nounix mount "
2209                                            "option.");
2210
2211                 }
2212         }
2213 }
2214
2215 static void
2216 convert_delimiter(char *path, char delim)
2217 {
2218         int i;
2219         char old_delim;
2220
2221         if (path == NULL)
2222                 return;
2223
2224         if (delim == '/')
2225                 old_delim = '\\';
2226         else
2227                 old_delim = '/';
2228
2229         for (i = 0; path[i] != '\0'; i++) {
2230                 if (path[i] == old_delim)
2231                         path[i] = delim;
2232         }
2233 }
2234
2235 static void setup_cifs_sb(struct smb_vol *pvolume_info,
2236                           struct cifs_sb_info *cifs_sb)
2237 {
2238         if (pvolume_info->rsize > CIFSMaxBufSize) {
2239                 cERROR(1, "rsize %d too large, using MaxBufSize",
2240                         pvolume_info->rsize);
2241                 cifs_sb->rsize = CIFSMaxBufSize;
2242         } else if ((pvolume_info->rsize) &&
2243                         (pvolume_info->rsize <= CIFSMaxBufSize))
2244                 cifs_sb->rsize = pvolume_info->rsize;
2245         else /* default */
2246                 cifs_sb->rsize = CIFSMaxBufSize;
2247
2248         if (pvolume_info->wsize > PAGEVEC_SIZE * PAGE_CACHE_SIZE) {
2249                 cERROR(1, "wsize %d too large, using 4096 instead",
2250                           pvolume_info->wsize);
2251                 cifs_sb->wsize = 4096;
2252         } else if (pvolume_info->wsize)
2253                 cifs_sb->wsize = pvolume_info->wsize;
2254         else
2255                 cifs_sb->wsize = min_t(const int,
2256                                         PAGEVEC_SIZE * PAGE_CACHE_SIZE,
2257                                         127*1024);
2258                 /* old default of CIFSMaxBufSize was too small now
2259                    that SMB Write2 can send multiple pages in kvec.
2260                    RFC1001 does not describe what happens when frame
2261                    bigger than 128K is sent so use that as max in
2262                    conjunction with 52K kvec constraint on arch with 4K
2263                    page size  */
2264
2265         if (cifs_sb->rsize < 2048) {
2266                 cifs_sb->rsize = 2048;
2267                 /* Windows ME may prefer this */
2268                 cFYI(1, "readsize set to minimum: 2048");
2269         }
2270         /* calculate prepath */
2271         cifs_sb->prepath = pvolume_info->prepath;
2272         if (cifs_sb->prepath) {
2273                 cifs_sb->prepathlen = strlen(cifs_sb->prepath);
2274                 /* we can not convert the / to \ in the path
2275                 separators in the prefixpath yet because we do not
2276                 know (until reset_cifs_unix_caps is called later)
2277                 whether POSIX PATH CAP is available. We normalize
2278                 the / to \ after reset_cifs_unix_caps is called */
2279                 pvolume_info->prepath = NULL;
2280         } else
2281                 cifs_sb->prepathlen = 0;
2282         cifs_sb->mnt_uid = pvolume_info->linux_uid;
2283         cifs_sb->mnt_gid = pvolume_info->linux_gid;
2284         cifs_sb->mnt_file_mode = pvolume_info->file_mode;
2285         cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
2286         cFYI(1, "file mode: 0x%x  dir mode: 0x%x",
2287                 cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
2288
2289         if (pvolume_info->noperm)
2290                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
2291         if (pvolume_info->setuids)
2292                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
2293         if (pvolume_info->server_ino)
2294                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
2295         if (pvolume_info->remap)
2296                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
2297         if (pvolume_info->no_xattr)
2298                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
2299         if (pvolume_info->sfu_emul)
2300                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
2301         if (pvolume_info->nobrl)
2302                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
2303         if (pvolume_info->nostrictsync)
2304                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
2305         if (pvolume_info->mand_lock)
2306                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
2307         if (pvolume_info->cifs_acl)
2308                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
2309         if (pvolume_info->override_uid)
2310                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
2311         if (pvolume_info->override_gid)
2312                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
2313         if (pvolume_info->dynperm)
2314                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
2315         if (pvolume_info->direct_io) {
2316                 cFYI(1, "mounting share using direct i/o");
2317                 cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
2318         }
2319
2320         if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
2321                 cERROR(1, "mount option dynperm ignored if cifsacl "
2322                            "mount option supported");
2323 }
2324
2325 static int
2326 is_path_accessible(int xid, struct cifsTconInfo *tcon,
2327                    struct cifs_sb_info *cifs_sb, const char *full_path)
2328 {
2329         int rc;
2330         FILE_ALL_INFO *pfile_info;
2331
2332         pfile_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
2333         if (pfile_info == NULL)
2334                 return -ENOMEM;
2335
2336         rc = CIFSSMBQPathInfo(xid, tcon, full_path, pfile_info,
2337                               0 /* not legacy */, cifs_sb->local_nls,
2338                               cifs_sb->mnt_cifs_flags &
2339                                 CIFS_MOUNT_MAP_SPECIAL_CHR);
2340         kfree(pfile_info);
2341         return rc;
2342 }
2343
2344 static void
2345 cleanup_volume_info(struct smb_vol **pvolume_info)
2346 {
2347         struct smb_vol *volume_info;
2348
2349         if (!pvolume_info && !*pvolume_info)
2350                 return;
2351
2352         volume_info = *pvolume_info;
2353         kzfree(volume_info->password);
2354         kfree(volume_info->UNC);
2355         kfree(volume_info->prepath);
2356         kfree(volume_info);
2357         *pvolume_info = NULL;
2358         return;
2359 }
2360
2361 #ifdef CONFIG_CIFS_DFS_UPCALL
2362 /* build_path_to_root returns full path to root when
2363  * we do not have an exiting connection (tcon) */
2364 static char *
2365 build_unc_path_to_root(const struct smb_vol *volume_info,
2366                 const struct cifs_sb_info *cifs_sb)
2367 {
2368         char *full_path;
2369
2370         int unc_len = strnlen(volume_info->UNC, MAX_TREE_SIZE + 1);
2371         full_path = kmalloc(unc_len + cifs_sb->prepathlen + 1, GFP_KERNEL);
2372         if (full_path == NULL)
2373                 return ERR_PTR(-ENOMEM);
2374
2375         strncpy(full_path, volume_info->UNC, unc_len);
2376         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) {
2377                 int i;
2378                 for (i = 0; i < unc_len; i++) {
2379                         if (full_path[i] == '\\')
2380                                 full_path[i] = '/';
2381                 }
2382         }
2383
2384         if (cifs_sb->prepathlen)
2385                 strncpy(full_path + unc_len, cifs_sb->prepath,
2386                                 cifs_sb->prepathlen);
2387
2388         full_path[unc_len + cifs_sb->prepathlen] = 0; /* add trailing null */
2389         return full_path;
2390 }
2391 #endif
2392
2393 int
2394 cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
2395                 char *mount_data_global, const char *devname)
2396 {
2397         int rc;
2398         int xid;
2399         struct smb_vol *volume_info;
2400         struct cifsSesInfo *pSesInfo;
2401         struct cifsTconInfo *tcon;
2402         struct TCP_Server_Info *srvTcp;
2403         char   *full_path;
2404         char *mount_data = mount_data_global;
2405 #ifdef CONFIG_CIFS_DFS_UPCALL
2406         struct dfs_info3_param *referrals = NULL;
2407         unsigned int num_referrals = 0;
2408         int referral_walks_count = 0;
2409 try_mount_again:
2410 #endif
2411         rc = 0;
2412         tcon = NULL;
2413         pSesInfo = NULL;
2414         srvTcp = NULL;
2415         full_path = NULL;
2416
2417         xid = GetXid();
2418
2419         volume_info = kzalloc(sizeof(struct smb_vol), GFP_KERNEL);
2420         if (!volume_info) {
2421                 rc = -ENOMEM;
2422                 goto out;
2423         }
2424
2425         if (cifs_parse_mount_options(mount_data, devname, volume_info)) {
2426                 rc = -EINVAL;
2427                 goto out;
2428         }
2429
2430         if (volume_info->nullauth) {
2431                 cFYI(1, "null user");
2432                 volume_info->username = "";
2433         } else if (volume_info->username) {
2434                 /* BB fixme parse for domain name here */
2435                 cFYI(1, "Username: %s", volume_info->username);
2436         } else {
2437                 cifserror("No username specified");
2438         /* In userspace mount helper we can get user name from alternate
2439            locations such as env variables and files on disk */
2440                 rc = -EINVAL;
2441                 goto out;
2442         }
2443
2444         /* this is needed for ASCII cp to Unicode converts */
2445         if (volume_info->iocharset == NULL) {
2446                 /* load_nls_default cannot return null */
2447                 volume_info->local_nls = load_nls_default();
2448         } else {
2449                 volume_info->local_nls = load_nls(volume_info->iocharset);
2450                 if (volume_info->local_nls == NULL) {
2451                         cERROR(1, "CIFS mount error: iocharset %s not found",
2452                                  volume_info->iocharset);
2453                         rc = -ELIBACC;
2454                         goto out;
2455                 }
2456         }
2457         cifs_sb->local_nls = volume_info->local_nls;
2458
2459         /* get a reference to a tcp session */
2460         srvTcp = cifs_get_tcp_session(volume_info);
2461         if (IS_ERR(srvTcp)) {
2462                 rc = PTR_ERR(srvTcp);
2463                 goto out;
2464         }
2465
2466         /* get a reference to a SMB session */
2467         pSesInfo = cifs_get_smb_ses(srvTcp, volume_info);
2468         if (IS_ERR(pSesInfo)) {
2469                 rc = PTR_ERR(pSesInfo);
2470                 pSesInfo = NULL;
2471                 goto mount_fail_check;
2472         }
2473
2474         /* search for existing tcon to this server share */
2475         if (!rc) {
2476                 setup_cifs_sb(volume_info, cifs_sb);
2477
2478                 tcon = cifs_find_tcon(pSesInfo, volume_info->UNC);
2479                 if (tcon) {
2480                         cFYI(1, "Found match on UNC path");
2481                         /* existing tcon already has a reference */
2482                         cifs_put_smb_ses(pSesInfo);
2483                         if (tcon->seal != volume_info->seal)
2484                                 cERROR(1, "transport encryption setting "
2485                                            "conflicts with existing tid");
2486                 } else {
2487                         tcon = tconInfoAlloc();
2488                         if (tcon == NULL) {
2489                                 rc = -ENOMEM;
2490                                 goto mount_fail_check;
2491                         }
2492
2493                         tcon->ses = pSesInfo;
2494                         if (volume_info->password) {
2495                                 tcon->password = kstrdup(volume_info->password,
2496                                                          GFP_KERNEL);
2497                                 if (!tcon->password) {
2498                                         rc = -ENOMEM;
2499                                         goto mount_fail_check;
2500                                 }
2501                         }
2502
2503                         if ((strchr(volume_info->UNC + 3, '\\') == NULL)
2504                             && (strchr(volume_info->UNC + 3, '/') == NULL)) {
2505                                 cERROR(1, "Missing share name");
2506                                 rc = -ENODEV;
2507                                 goto mount_fail_check;
2508                         } else {
2509                                 /* BB Do we need to wrap sesSem around
2510                                  * this TCon call and Unix SetFS as
2511                                  * we do on SessSetup and reconnect? */
2512                                 rc = CIFSTCon(xid, pSesInfo, volume_info->UNC,
2513                                               tcon, cifs_sb->local_nls);
2514                                 cFYI(1, "CIFS Tcon rc = %d", rc);
2515                                 if (volume_info->nodfs) {
2516                                         tcon->Flags &= ~SMB_SHARE_IS_IN_DFS;
2517                                         cFYI(1, "DFS disabled (%d)",
2518                                                 tcon->Flags);
2519                                 }
2520                         }
2521                         if (rc)
2522                                 goto remote_path_check;
2523                         tcon->seal = volume_info->seal;
2524                         write_lock(&cifs_tcp_ses_lock);
2525                         list_add(&tcon->tcon_list, &pSesInfo->tcon_list);
2526                         write_unlock(&cifs_tcp_ses_lock);
2527                 }
2528
2529                 /* we can have only one retry value for a connection
2530                    to a share so for resources mounted more than once
2531                    to the same server share the last value passed in
2532                    for the retry flag is used */
2533                 tcon->retry = volume_info->retry;
2534                 tcon->nocase = volume_info->nocase;
2535                 tcon->local_lease = volume_info->local_lease;
2536         }
2537         if (pSesInfo) {
2538                 if (pSesInfo->capabilities & CAP_LARGE_FILES)
2539                         sb->s_maxbytes = MAX_LFS_FILESIZE;
2540                 else
2541                         sb->s_maxbytes = MAX_NON_LFS;
2542         }
2543
2544         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
2545         sb->s_time_gran = 100;
2546
2547         if (rc)
2548                 goto remote_path_check;
2549
2550         cifs_sb->tcon = tcon;
2551
2552         /* do not care if following two calls succeed - informational */
2553         if (!tcon->ipc) {
2554                 CIFSSMBQFSDeviceInfo(xid, tcon);
2555                 CIFSSMBQFSAttributeInfo(xid, tcon);
2556         }
2557
2558         /* tell server which Unix caps we support */
2559         if (tcon->ses->capabilities & CAP_UNIX)
2560                 /* reset of caps checks mount to see if unix extensions
2561                    disabled for just this mount */
2562                 reset_cifs_unix_caps(xid, tcon, sb, volume_info);
2563         else
2564                 tcon->unix_ext = 0; /* server does not support them */
2565
2566         /* convert forward to back slashes in prepath here if needed */
2567         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2568                 convert_delimiter(cifs_sb->prepath, CIFS_DIR_SEP(cifs_sb));
2569
2570         if ((tcon->unix_ext == 0) && (cifs_sb->rsize > (1024 * 127))) {
2571                 cifs_sb->rsize = 1024 * 127;
2572                 cFYI(DBG2, "no very large read support, rsize now 127K");
2573         }
2574         if (!(tcon->ses->capabilities & CAP_LARGE_WRITE_X))
2575                 cifs_sb->wsize = min(cifs_sb->wsize,
2576                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2577         if (!(tcon->ses->capabilities & CAP_LARGE_READ_X))
2578                 cifs_sb->rsize = min(cifs_sb->rsize,
2579                                (tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE));
2580
2581 remote_path_check:
2582         /* check if a whole path (including prepath) is not remote */
2583         if (!rc && cifs_sb->prepathlen && tcon) {
2584                 /* build_path_to_root works only when we have a valid tcon */
2585                 full_path = cifs_build_path_to_root(cifs_sb);
2586                 if (full_path == NULL) {
2587                         rc = -ENOMEM;
2588                         goto mount_fail_check;
2589                 }
2590                 rc = is_path_accessible(xid, tcon, cifs_sb, full_path);
2591                 if (rc != -EREMOTE) {
2592                         kfree(full_path);
2593                         goto mount_fail_check;
2594                 }
2595                 kfree(full_path);
2596         }
2597
2598         /* get referral if needed */
2599         if (rc == -EREMOTE) {
2600 #ifdef CONFIG_CIFS_DFS_UPCALL
2601                 if (referral_walks_count > MAX_NESTED_LINKS) {
2602                         /*
2603                          * BB: when we implement proper loop detection,
2604                          *     we will remove this check. But now we need it
2605                          *     to prevent an indefinite loop if 'DFS tree' is
2606                          *     misconfigured (i.e. has loops).
2607                          */
2608                         rc = -ELOOP;
2609                         goto mount_fail_check;
2610                 }
2611                 /* convert forward to back slashes in prepath here if needed */
2612                 if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS) == 0)
2613                         convert_delimiter(cifs_sb->prepath,
2614                                         CIFS_DIR_SEP(cifs_sb));
2615                 full_path = build_unc_path_to_root(volume_info, cifs_sb);
2616                 if (IS_ERR(full_path)) {
2617                         rc = PTR_ERR(full_path);
2618                         goto mount_fail_check;
2619                 }
2620
2621                 cFYI(1, "Getting referral for: %s", full_path);
2622                 rc = get_dfs_path(xid, pSesInfo , full_path + 1,
2623                         cifs_sb->local_nls, &num_referrals, &referrals,
2624                         cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
2625                 if (!rc && num_referrals > 0) {
2626                         char *fake_devname = NULL;
2627
2628                         if (mount_data != mount_data_global)
2629                                 kfree(mount_data);
2630
2631                         mount_data = cifs_compose_mount_options(
2632                                         cifs_sb->mountdata, full_path + 1,
2633                                         referrals, &fake_devname);
2634
2635                         free_dfs_info_array(referrals, num_referrals);
2636                         kfree(fake_devname);
2637                         kfree(full_path);
2638
2639                         if (IS_ERR(mount_data)) {
2640                                 rc = PTR_ERR(mount_data);
2641                                 mount_data = NULL;
2642                                 goto mount_fail_check;
2643                         }
2644
2645                         if (tcon)
2646                                 cifs_put_tcon(tcon);
2647                         else if (pSesInfo)
2648                                 cifs_put_smb_ses(pSesInfo);
2649
2650                         cleanup_volume_info(&volume_info);
2651                         referral_walks_count++;
2652                         FreeXid(xid);
2653                         goto try_mount_again;
2654                 }
2655 #else /* No DFS support, return error on mount */
2656                 rc = -EOPNOTSUPP;
2657 #endif
2658         }
2659
2660 mount_fail_check:
2661         /* on error free sesinfo and tcon struct if needed */
2662         if (rc) {
2663                 if (mount_data != mount_data_global)
2664                         kfree(mount_data);
2665                 /* If find_unc succeeded then rc == 0 so we can not end */
2666                 /* up accidently freeing someone elses tcon struct */
2667                 if (tcon)
2668                         cifs_put_tcon(tcon);
2669                 else if (pSesInfo)
2670                         cifs_put_smb_ses(pSesInfo);
2671                 else
2672                         cifs_put_tcp_session(srvTcp);
2673                 goto out;
2674         }
2675
2676         /* volume_info->password is freed above when existing session found
2677         (in which case it is not needed anymore) but when new sesion is created
2678         the password ptr is put in the new session structure (in which case the
2679         password will be freed at unmount time) */
2680 out:
2681         /* zero out password before freeing */
2682         cleanup_volume_info(&volume_info);
2683         FreeXid(xid);
2684         return rc;
2685 }
2686
2687 int
2688 CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
2689          const char *tree, struct cifsTconInfo *tcon,
2690          const struct nls_table *nls_codepage)
2691 {
2692         struct smb_hdr *smb_buffer;
2693         struct smb_hdr *smb_buffer_response;
2694         TCONX_REQ *pSMB;
2695         TCONX_RSP *pSMBr;
2696         unsigned char *bcc_ptr;
2697         int rc = 0;
2698         int length, bytes_left;
2699         __u16 count;
2700
2701         if (ses == NULL)
2702                 return -EIO;
2703
2704         smb_buffer = cifs_buf_get();
2705         if (smb_buffer == NULL)
2706                 return -ENOMEM;
2707
2708         smb_buffer_response = smb_buffer;
2709
2710         header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
2711                         NULL /*no tid */ , 4 /*wct */ );
2712
2713         smb_buffer->Mid = GetNextMid(ses->server);
2714         smb_buffer->Uid = ses->Suid;
2715         pSMB = (TCONX_REQ *) smb_buffer;
2716         pSMBr = (TCONX_RSP *) smb_buffer_response;
2717
2718         pSMB->AndXCommand = 0xFF;
2719         pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
2720         bcc_ptr = &pSMB->Password[0];
2721         if ((ses->server->secMode) & SECMODE_USER) {
2722                 pSMB->PasswordLength = cpu_to_le16(1);  /* minimum */
2723                 *bcc_ptr = 0; /* password is null byte */
2724                 bcc_ptr++;              /* skip password */
2725                 /* already aligned so no need to do it below */
2726         } else {
2727                 pSMB->PasswordLength = cpu_to_le16(CIFS_SESS_KEY_SIZE);
2728                 /* BB FIXME add code to fail this if NTLMv2 or Kerberos
2729                    specified as required (when that support is added to
2730                    the vfs in the future) as only NTLM or the much
2731                    weaker LANMAN (which we do not send by default) is accepted
2732                    by Samba (not sure whether other servers allow
2733                    NTLMv2 password here) */
2734 #ifdef CONFIG_CIFS_WEAK_PW_HASH
2735                 if ((extended_security & CIFSSEC_MAY_LANMAN) &&
2736                     (ses->server->secType == LANMAN))
2737                         calc_lanman_hash(tcon->password, ses->server->cryptKey,
2738                                          ses->server->secMode &
2739                                             SECMODE_PW_ENCRYPT ? true : false,
2740                                          bcc_ptr);
2741                 else
2742 #endif /* CIFS_WEAK_PW_HASH */
2743                 SMBNTencrypt(tcon->password, ses->server->cryptKey,
2744                              bcc_ptr);
2745
2746                 bcc_ptr += CIFS_SESS_KEY_SIZE;
2747                 if (ses->capabilities & CAP_UNICODE) {
2748                         /* must align unicode strings */
2749                         *bcc_ptr = 0; /* null byte password */
2750                         bcc_ptr++;
2751                 }
2752         }
2753
2754         if (ses->server->secMode &
2755                         (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
2756                 smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
2757
2758         if (ses->capabilities & CAP_STATUS32) {
2759                 smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
2760         }
2761         if (ses->capabilities & CAP_DFS) {
2762                 smb_buffer->Flags2 |= SMBFLG2_DFS;
2763         }
2764         if (ses->capabilities & CAP_UNICODE) {
2765                 smb_buffer->Flags2 |= SMBFLG2_UNICODE;
2766                 length =
2767                     cifs_strtoUCS((__le16 *) bcc_ptr, tree,
2768                         6 /* max utf8 char length in bytes */ *
2769                         (/* server len*/ + 256 /* share len */), nls_codepage);
2770                 bcc_ptr += 2 * length;  /* convert num 16 bit words to bytes */
2771                 bcc_ptr += 2;   /* skip trailing null */
2772         } else {                /* ASCII */
2773                 strcpy(bcc_ptr, tree);
2774                 bcc_ptr += strlen(tree) + 1;
2775         }
2776         strcpy(bcc_ptr, "?????");
2777         bcc_ptr += strlen("?????");
2778         bcc_ptr += 1;
2779         count = bcc_ptr - &pSMB->Password[0];
2780         pSMB->hdr.smb_buf_length += count;
2781         pSMB->ByteCount = cpu_to_le16(count);
2782
2783         rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
2784                          CIFS_STD_OP);
2785
2786         /* above now done in SendReceive */
2787         if ((rc == 0) && (tcon != NULL)) {
2788                 bool is_unicode;
2789
2790                 tcon->tidStatus = CifsGood;
2791                 tcon->need_reconnect = false;
2792                 tcon->tid = smb_buffer_response->Tid;
2793                 bcc_ptr = pByteArea(smb_buffer_response);
2794                 bytes_left = BCC(smb_buffer_response);
2795                 length = strnlen(bcc_ptr, bytes_left - 2);
2796                 if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
2797                         is_unicode = true;
2798                 else
2799                         is_unicode = false;
2800
2801
2802                 /* skip service field (NB: this field is always ASCII) */
2803                 if (length == 3) {
2804                         if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
2805                             (bcc_ptr[2] == 'C')) {
2806                                 cFYI(1, "IPC connection");
2807                                 tcon->ipc = 1;
2808                         }
2809                 } else if (length == 2) {
2810                         if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
2811                                 /* the most common case */
2812                                 cFYI(1, "disk share connection");
2813                         }
2814                 }
2815                 bcc_ptr += length + 1;
2816                 bytes_left -= (length + 1);
2817                 strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
2818
2819                 /* mostly informational -- no need to fail on error here */
2820                 kfree(tcon->nativeFileSystem);
2821                 tcon->nativeFileSystem = cifs_strndup_from_ucs(bcc_ptr,
2822                                                       bytes_left, is_unicode,
2823                                                       nls_codepage);
2824
2825                 cFYI(1, "nativeFileSystem=%s", tcon->nativeFileSystem);
2826
2827                 if ((smb_buffer_response->WordCount == 3) ||
2828                          (smb_buffer_response->WordCount == 7))
2829                         /* field is in same location */
2830                         tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
2831                 else
2832                         tcon->Flags = 0;
2833                 cFYI(1, "Tcon flags: 0x%x ", tcon->Flags);
2834         } else if ((rc == 0) && tcon == NULL) {
2835                 /* all we need to save for IPC$ connection */
2836                 ses->ipc_tid = smb_buffer_response->Tid;
2837         }
2838
2839         cifs_buf_release(smb_buffer);
2840         return rc;
2841 }
2842
2843 int
2844 cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
2845 {
2846         int rc = 0;
2847         char *tmp;
2848
2849         if (cifs_sb->tcon)
2850                 cifs_put_tcon(cifs_sb->tcon);
2851
2852         cifs_sb->tcon = NULL;
2853         tmp = cifs_sb->prepath;
2854         cifs_sb->prepathlen = 0;
2855         cifs_sb->prepath = NULL;
2856         kfree(tmp);
2857
2858         return rc;
2859 }
2860
2861 int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
2862                                            struct nls_table *nls_info)
2863 {
2864         int rc = 0;
2865         int first_time = 0;
2866         struct TCP_Server_Info *server = pSesInfo->server;
2867
2868         /* what if server changes its buffer size after dropping the session? */
2869         if (server->maxBuf == 0) /* no need to send on reconnect */ {
2870                 rc = CIFSSMBNegotiate(xid, pSesInfo);
2871                 if (rc == -EAGAIN) {
2872                         /* retry only once on 1st time connection */
2873                         rc = CIFSSMBNegotiate(xid, pSesInfo);
2874                         if (rc == -EAGAIN)
2875                                 rc = -EHOSTDOWN;
2876                 }
2877                 if (rc == 0) {
2878                         spin_lock(&GlobalMid_Lock);
2879                         if (server->tcpStatus != CifsExiting)
2880                                 server->tcpStatus = CifsGood;
2881                         else
2882                                 rc = -EHOSTDOWN;
2883                         spin_unlock(&GlobalMid_Lock);
2884
2885                 }
2886                 first_time = 1;
2887         }
2888
2889         if (rc)
2890                 goto ss_err_exit;
2891
2892         pSesInfo->flags = 0;
2893         pSesInfo->capabilities = server->capabilities;
2894         if (linuxExtEnabled == 0)
2895                 pSesInfo->capabilities &= (~CAP_UNIX);
2896
2897         cFYI(1, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d",
2898                  server->secMode, server->capabilities, server->timeAdj);
2899
2900         rc = CIFS_SessSetup(xid, pSesInfo, first_time, nls_info);
2901         if (rc) {
2902                 cERROR(1, "Send error in SessSetup = %d", rc);
2903         } else {
2904                 cFYI(1, "CIFS Session Established successfully");
2905                 spin_lock(&GlobalMid_Lock);
2906                 pSesInfo->status = CifsGood;
2907                 pSesInfo->need_reconnect = false;
2908                 spin_unlock(&GlobalMid_Lock);
2909         }
2910
2911 ss_err_exit:
2912         return rc;
2913 }
2914