fs/cifs/smb2ops.c

   1 /*
   2  *  SMB2 version specific operations
   3  *
   4  *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
   5  *
   6  *  This library is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License v2 as published
   8  *  by the Free Software Foundation.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *  the GNU Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public License
  16  *  along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <linux/pagemap.h>
  21 #include <linux/vfs.h>
  22 #include <linux/falloc.h>
  23 #include <linux/scatterlist.h>
  24 #include <linux/uuid.h>
  25 #include <crypto/aead.h>
  26 #include "cifsglob.h"
  27 #include "smb2pdu.h"
  28 #include "smb2proto.h"
  29 #include "cifsproto.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_unicode.h"
  32 #include "smb2status.h"
  33 #include "smb2glob.h"
  34 #include "cifs_ioctl.h"
  35 #include "smbdirect.h"
  36
  37 /* Change credits for different ops and return the total number of credits */
  38 static int
  39 change_conf(struct TCP_Server_Info *server)
  40 {
  41         server->credits += server->echo_credits + server->oplock_credits;
  42         server->oplock_credits = server->echo_credits = 0;
  43         switch (server->credits) {
  44         case 0:
  45                 return 0;
  46         case 1:
  47                 server->echoes = false;
  48                 server->oplocks = false;
  49                 break;
  50         case 2:
  51                 server->echoes = true;
  52                 server->oplocks = false;
  53                 server->echo_credits = 1;
  54                 break;
  55         default:
  56                 server->echoes = true;
  57                 if (enable_oplocks) {
  58                         server->oplocks = true;
  59                         server->oplock_credits = 1;
  60                 } else
  61                         server->oplocks = false;
  62
  63                 server->echo_credits = 1;
  64         }
  65         server->credits -= server->echo_credits + server->oplock_credits;
  66         return server->credits + server->echo_credits + server->oplock_credits;
  67 }
  68
  69 static void
  70 smb2_add_credits(struct TCP_Server_Info *server,
  71                  const struct cifs_credits *credits, const int optype)
  72 {
  73         int *val, rc = -1;
  74         unsigned int add = credits->value;
  75         unsigned int instance = credits->instance;
  76         bool reconnect_detected = false;
  77
  78         spin_lock(&server->req_lock);
  79         val = server->ops->get_credits_field(server, optype);
  80
  81         /* eg found case where write overlapping reconnect messed up credits */
  82         if (((optype & CIFS_OP_MASK) == CIFS_NEG_OP) && (*val != 0))
  83                 trace_smb3_reconnect_with_invalid_credits(server->CurrentMid,
  84                         server->hostname, *val);
  85         if ((instance == 0) || (instance == server->reconnect_instance))
  86                 *val += add;
  87         else
  88                 reconnect_detected = true;
  89
  90         if (*val > 65000) {
  91                 *val = 65000; /* Don't get near 64K credits, avoid srv bugs */
  92                 printk_once(KERN_WARNING "server overflowed SMB3 credits\n");
  93         }
  94         server->in_flight--;
  95         if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
  96                 rc = change_conf(server);
  97         /*
  98          * Sometimes server returns 0 credits on oplock break ack - we need to
  99          * rebalance credits in this case.
 100          */
 101         else if (server->in_flight > 0 && server->oplock_credits == 0 &&
 102                  server->oplocks) {
 103                 if (server->credits > 1) {
 104                         server->credits--;
 105                         server->oplock_credits++;
 106                 }
 107         }
 108         spin_unlock(&server->req_lock);
 109         wake_up(&server->request_q);
 110
 111         if (reconnect_detected)
 112                 cifs_dbg(FYI, "trying to put %d credits from the old server instance %d\n",
 113                          add, instance);
 114
 115         if (server->tcpStatus == CifsNeedReconnect
 116             || server->tcpStatus == CifsExiting)
 117                 return;
 118
 119         switch (rc) {
 120         case -1:
 121                 /* change_conf hasn't been executed */
 122                 break;
 123         case 0:
 124                 cifs_dbg(VFS, "Possible client or server bug - zero credits\n");
 125                 break;
 126         case 1:
 127                 cifs_dbg(VFS, "disabling echoes and oplocks\n");
 128                 break;
 129         case 2:
 130                 cifs_dbg(FYI, "disabling oplocks\n");
 131                 break;
 132         default:
 133                 cifs_dbg(FYI, "add %u credits total=%d\n", add, rc);
 134         }
 135 }
 136
 137 static void
 138 smb2_set_credits(struct TCP_Server_Info *server, const int val)
 139 {
 140         spin_lock(&server->req_lock);
 141         server->credits = val;
 142         if (val == 1)
 143                 server->reconnect_instance++;
 144         spin_unlock(&server->req_lock);
 145         /* don't log while holding the lock */
 146         if (val == 1)
 147                 cifs_dbg(FYI, "set credits to 1 due to smb2 reconnect\n");
 148 }
 149
 150 static int *
 151 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
 152 {
 153         switch (optype) {
 154         case CIFS_ECHO_OP:
 155                 return &server->echo_credits;
 156         case CIFS_OBREAK_OP:
 157                 return &server->oplock_credits;
 158         default:
 159                 return &server->credits;
 160         }
 161 }
 162
 163 static unsigned int
 164 smb2_get_credits(struct mid_q_entry *mid)
 165 {
 166         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)mid->resp_buf;
 167
 168         if (mid->mid_state == MID_RESPONSE_RECEIVED
 169             || mid->mid_state == MID_RESPONSE_MALFORMED)
 170                 return le16_to_cpu(shdr->CreditRequest);
 171
 172         return 0;
 173 }
 174
 175 static int
 176 smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
 177                       unsigned int *num, struct cifs_credits *credits)
 178 {
 179         int rc = 0;
 180         unsigned int scredits;
 181
 182         spin_lock(&server->req_lock);
 183         while (1) {
 184                 if (server->credits <= 0) {
 185                         spin_unlock(&server->req_lock);
 186                         cifs_num_waiters_inc(server);
 187                         rc = wait_event_killable(server->request_q,
 188                                 has_credits(server, &server->credits, 1));
 189                         cifs_num_waiters_dec(server);
 190                         if (rc)
 191                                 return rc;
 192                         spin_lock(&server->req_lock);
 193                 } else {
 194                         if (server->tcpStatus == CifsExiting) {
 195                                 spin_unlock(&server->req_lock);
 196                                 return -ENOENT;
 197                         }
 198
 199                         scredits = server->credits;
 200                         /* can deadlock with reopen */
 201                         if (scredits <= 8) {
 202                                 *num = SMB2_MAX_BUFFER_SIZE;
 203                                 credits->value = 0;
 204                                 credits->instance = 0;
 205                                 break;
 206                         }
 207
 208                         /* leave some credits for reopen and other ops */
 209                         scredits -= 8;
 210                         *num = min_t(unsigned int, size,
 211                                      scredits * SMB2_MAX_BUFFER_SIZE);
 212
 213                         credits->value =
 214                                 DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
 215                         credits->instance = server->reconnect_instance;
 216                         server->credits -= credits->value;
 217                         server->in_flight++;
 218                         break;
 219                 }
 220         }
 221         spin_unlock(&server->req_lock);
 222         return rc;
 223 }
 224
 225 static int
 226 smb2_adjust_credits(struct TCP_Server_Info *server,
 227                     struct cifs_credits *credits,
 228                     const unsigned int payload_size)
 229 {
 230         int new_val = DIV_ROUND_UP(payload_size, SMB2_MAX_BUFFER_SIZE);
 231
 232         if (!credits->value || credits->value == new_val)
 233                 return 0;
 234
 235         if (credits->value < new_val) {
 236                 WARN_ONCE(1, "request has less credits (%d) than required (%d)",
 237                           credits->value, new_val);
 238                 return -ENOTSUPP;
 239         }
 240
 241         spin_lock(&server->req_lock);
 242
 243         if (server->reconnect_instance != credits->instance) {
 244                 spin_unlock(&server->req_lock);
 245                 cifs_dbg(VFS, "trying to return %d credits to old session\n",
 246                          credits->value - new_val);
 247                 return -EAGAIN;
 248         }
 249
 250         server->credits += credits->value - new_val;
 251         spin_unlock(&server->req_lock);
 252         wake_up(&server->request_q);
 253         credits->value = new_val;
 254         return 0;
 255 }
 256
 257 static __u64
 258 smb2_get_next_mid(struct TCP_Server_Info *server)
 259 {
 260         __u64 mid;
 261         /* for SMB2 we need the current value */
 262         spin_lock(&GlobalMid_Lock);
 263         mid = server->CurrentMid++;
 264         spin_unlock(&GlobalMid_Lock);
 265         return mid;
 266 }
 267
 268 static void
 269 smb2_revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
 270 {
 271         spin_lock(&GlobalMid_Lock);
 272         if (server->CurrentMid >= val)
 273                 server->CurrentMid -= val;
 274         spin_unlock(&GlobalMid_Lock);
 275 }
 276
 277 static struct mid_q_entry *
 278 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
 279 {
 280         struct mid_q_entry *mid;
 281         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
 282         __u64 wire_mid = le64_to_cpu(shdr->MessageId);
 283
 284         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 285                 cifs_dbg(VFS, "encrypted frame parsing not supported yet");
 286                 return NULL;
 287         }
 288
 289         spin_lock(&GlobalMid_Lock);
 290         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 291                 if ((mid->mid == wire_mid) &&
 292                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
 293                     (mid->command == shdr->Command)) {
 294                         kref_get(&mid->refcount);
 295                         spin_unlock(&GlobalMid_Lock);
 296                         return mid;
 297                 }
 298         }
 299         spin_unlock(&GlobalMid_Lock);
 300         return NULL;
 301 }
 302
 303 static void
 304 smb2_dump_detail(void *buf, struct TCP_Server_Info *server)
 305 {
 306 #ifdef CONFIG_CIFS_DEBUG2
 307         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
 308
 309         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
 310                  shdr->Command, shdr->Status, shdr->Flags, shdr->MessageId,
 311                  shdr->ProcessId);
 312         cifs_dbg(VFS, "smb buf %p len %u\n", buf,
 313                  server->ops->calc_smb_size(buf, server));
 314 #endif
 315 }
 316
 317 static bool
 318 smb2_need_neg(struct TCP_Server_Info *server)
 319 {
 320         return server->max_read == 0;
 321 }
 322
 323 static int
 324 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 325 {
 326         int rc;
 327         ses->server->CurrentMid = 0;
 328         rc = SMB2_negotiate(xid, ses);
 329         /* BB we probably don't need to retry with modern servers */
 330         if (rc == -EAGAIN)
 331                 rc = -EHOSTDOWN;
 332         return rc;
 333 }
 334
 335 static unsigned int
 336 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 337 {
 338         struct TCP_Server_Info *server = tcon->ses->server;
 339         unsigned int wsize;
 340
 341         /* start with specified wsize, or default */
 342         wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
 343         wsize = min_t(unsigned int, wsize, server->max_write);
 344 #ifdef CONFIG_CIFS_SMB_DIRECT
 345         if (server->rdma) {
 346                 if (server->sign)
 347                         wsize = min_t(unsigned int,
 348                                 wsize, server->smbd_conn->max_fragmented_send_size);
 349                 else
 350                         wsize = min_t(unsigned int,
 351                                 wsize, server->smbd_conn->max_readwrite_size);
 352         }
 353 #endif
 354         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 355                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 356
 357         return wsize;
 358 }
 359
 360 static unsigned int
 361 smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 362 {
 363         struct TCP_Server_Info *server = tcon->ses->server;
 364         unsigned int wsize;
 365
 366         /* start with specified wsize, or default */
 367         wsize = volume_info->wsize ? volume_info->wsize : SMB3_DEFAULT_IOSIZE;
 368         wsize = min_t(unsigned int, wsize, server->max_write);
 369 #ifdef CONFIG_CIFS_SMB_DIRECT
 370         if (server->rdma) {
 371                 if (server->sign)
 372                         wsize = min_t(unsigned int,
 373                                 wsize, server->smbd_conn->max_fragmented_send_size);
 374                 else
 375                         wsize = min_t(unsigned int,
 376                                 wsize, server->smbd_conn->max_readwrite_size);
 377         }
 378 #endif
 379         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 380                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 381
 382         return wsize;
 383 }
 384
 385 static unsigned int
 386 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 387 {
 388         struct TCP_Server_Info *server = tcon->ses->server;
 389         unsigned int rsize;
 390
 391         /* start with specified rsize, or default */
 392         rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
 393         rsize = min_t(unsigned int, rsize, server->max_read);
 394 #ifdef CONFIG_CIFS_SMB_DIRECT
 395         if (server->rdma) {
 396                 if (server->sign)
 397                         rsize = min_t(unsigned int,
 398                                 rsize, server->smbd_conn->max_fragmented_recv_size);
 399                 else
 400                         rsize = min_t(unsigned int,
 401                                 rsize, server->smbd_conn->max_readwrite_size);
 402         }
 403 #endif
 404
 405         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 406                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 407
 408         return rsize;
 409 }
 410
 411 static unsigned int
 412 smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 413 {
 414         struct TCP_Server_Info *server = tcon->ses->server;
 415         unsigned int rsize;
 416
 417         /* start with specified rsize, or default */
 418         rsize = volume_info->rsize ? volume_info->rsize : SMB3_DEFAULT_IOSIZE;
 419         rsize = min_t(unsigned int, rsize, server->max_read);
 420 #ifdef CONFIG_CIFS_SMB_DIRECT
 421         if (server->rdma) {
 422                 if (server->sign)
 423                         rsize = min_t(unsigned int,
 424                                 rsize, server->smbd_conn->max_fragmented_recv_size);
 425                 else
 426                         rsize = min_t(unsigned int,
 427                                 rsize, server->smbd_conn->max_readwrite_size);
 428         }
 429 #endif
 430
 431         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 432                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 433
 434         return rsize;
 435 }
 436
 437 static int
 438 parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
 439                         size_t buf_len,
 440                         struct cifs_server_iface **iface_list,
 441                         size_t *iface_count)
 442 {
 443         struct network_interface_info_ioctl_rsp *p;
 444         struct sockaddr_in *addr4;
 445         struct sockaddr_in6 *addr6;
 446         struct iface_info_ipv4 *p4;
 447         struct iface_info_ipv6 *p6;
 448         struct cifs_server_iface *info;
 449         ssize_t bytes_left;
 450         size_t next = 0;
 451         int nb_iface = 0;
 452         int rc = 0;
 453
 454         *iface_list = NULL;
 455         *iface_count = 0;
 456
 457         /*
 458          * Fist pass: count and sanity check
 459          */
 460
 461         bytes_left = buf_len;
 462         p = buf;
 463         while (bytes_left >= sizeof(*p)) {
 464                 nb_iface++;
 465                 next = le32_to_cpu(p->Next);
 466                 if (!next) {
 467                         bytes_left -= sizeof(*p);
 468                         break;
 469                 }
 470                 p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
 471                 bytes_left -= next;
 472         }
 473
 474         if (!nb_iface) {
 475                 cifs_dbg(VFS, "%s: malformed interface info\n", __func__);
 476                 rc = -EINVAL;
 477                 goto out;
 478         }
 479
 480         if (bytes_left || p->Next)
 481                 cifs_dbg(VFS, "%s: incomplete interface info\n", __func__);
 482
 483
 484         /*
 485          * Second pass: extract info to internal structure
 486          */
 487
 488         *iface_list = kcalloc(nb_iface, sizeof(**iface_list), GFP_KERNEL);
 489         if (!*iface_list) {
 490                 rc = -ENOMEM;
 491                 goto out;
 492         }
 493
 494         info = *iface_list;
 495         bytes_left = buf_len;
 496         p = buf;
 497         while (bytes_left >= sizeof(*p)) {
 498                 info->speed = le64_to_cpu(p->LinkSpeed);
 499                 info->rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE);
 500                 info->rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE);
 501
 502                 cifs_dbg(FYI, "%s: adding iface %zu\n", __func__, *iface_count);
 503                 cifs_dbg(FYI, "%s: speed %zu bps\n", __func__, info->speed);
 504                 cifs_dbg(FYI, "%s: capabilities 0x%08x\n", __func__,
 505                          le32_to_cpu(p->Capability));
 506
 507                 switch (p->Family) {
 508                 /*
 509                  * The kernel and wire socket structures have the same
 510                  * layout and use network byte order but make the
 511                  * conversion explicit in case either one changes.
 512                  */
 513                 case INTERNETWORK:
 514                         addr4 = (struct sockaddr_in *)&info->sockaddr;
 515                         p4 = (struct iface_info_ipv4 *)p->Buffer;
 516                         addr4->sin_family = AF_INET;
 517                         memcpy(&addr4->sin_addr, &p4->IPv4Address, 4);
 518
 519                         /* [MS-SMB2] 2.2.32.5.1.1 Clients MUST ignore these */
 520                         addr4->sin_port = cpu_to_be16(CIFS_PORT);
 521
 522                         cifs_dbg(FYI, "%s: ipv4 %pI4\n", __func__,
 523                                  &addr4->sin_addr);
 524                         break;
 525                 case INTERNETWORKV6:
 526                         addr6 = (struct sockaddr_in6 *)&info->sockaddr;
 527                         p6 = (struct iface_info_ipv6 *)p->Buffer;
 528                         addr6->sin6_family = AF_INET6;
 529                         memcpy(&addr6->sin6_addr, &p6->IPv6Address, 16);
 530
 531                         /* [MS-SMB2] 2.2.32.5.1.2 Clients MUST ignore these */
 532                         addr6->sin6_flowinfo = 0;
 533                         addr6->sin6_scope_id = 0;
 534                         addr6->sin6_port = cpu_to_be16(CIFS_PORT);
 535
 536                         cifs_dbg(FYI, "%s: ipv6 %pI6\n", __func__,
 537                                  &addr6->sin6_addr);
 538                         break;
 539                 default:
 540                         cifs_dbg(VFS,
 541                                  "%s: skipping unsupported socket family\n",
 542                                  __func__);
 543                         goto next_iface;
 544                 }
 545
 546                 (*iface_count)++;
 547                 info++;
 548 next_iface:
 549                 next = le32_to_cpu(p->Next);
 550                 if (!next)
 551                         break;
 552                 p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
 553                 bytes_left -= next;
 554         }
 555
 556         if (!*iface_count) {
 557                 rc = -EINVAL;
 558                 goto out;
 559         }
 560
 561 out:
 562         if (rc) {
 563                 kfree(*iface_list);
 564                 *iface_count = 0;
 565                 *iface_list = NULL;
 566         }
 567         return rc;
 568 }
 569
 570
 571 static int
 572 SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
 573 {
 574         int rc;
 575         unsigned int ret_data_len = 0;
 576         struct network_interface_info_ioctl_rsp *out_buf = NULL;
 577         struct cifs_server_iface *iface_list;
 578         size_t iface_count;
 579         struct cifs_ses *ses = tcon->ses;
 580
 581         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 582                         FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
 583                         NULL /* no data input */, 0 /* no data input */,
 584                         CIFSMaxBufSize, (char **)&out_buf, &ret_data_len);
 585         if (rc == -EOPNOTSUPP) {
 586                 cifs_dbg(FYI,
 587                          "server does not support query network interfaces\n");
 588                 goto out;
 589         } else if (rc != 0) {
 590                 cifs_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
 591                 goto out;
 592         }
 593
 594         rc = parse_server_interfaces(out_buf, ret_data_len,
 595                                      &iface_list, &iface_count);
 596         if (rc)
 597                 goto out;
 598
 599         spin_lock(&ses->iface_lock);
 600         kfree(ses->iface_list);
 601         ses->iface_list = iface_list;
 602         ses->iface_count = iface_count;
 603         ses->iface_last_update = jiffies;
 604         spin_unlock(&ses->iface_lock);
 605
 606 out:
 607         kfree(out_buf);
 608         return rc;
 609 }
 610
 611 static void
 612 smb2_close_cached_fid(struct kref *ref)
 613 {
 614         struct cached_fid *cfid = container_of(ref, struct cached_fid,
 615                                                refcount);
 616
 617         if (cfid->is_valid) {
 618                 cifs_dbg(FYI, "clear cached root file handle\n");
 619                 SMB2_close(0, cfid->tcon, cfid->fid->persistent_fid,
 620                            cfid->fid->volatile_fid);
 621                 cfid->is_valid = false;
 622                 cfid->file_all_info_is_valid = false;
 623         }
 624 }
 625
 626 void close_shroot(struct cached_fid *cfid)
 627 {
 628         mutex_lock(&cfid->fid_mutex);
 629         kref_put(&cfid->refcount, smb2_close_cached_fid);
 630         mutex_unlock(&cfid->fid_mutex);
 631 }
 632
 633 void
 634 smb2_cached_lease_break(struct work_struct *work)
 635 {
 636         struct cached_fid *cfid = container_of(work,
 637                                 struct cached_fid, lease_break);
 638
 639         close_shroot(cfid);
 640 }
 641
 642 /*
 643  * Open the directory at the root of a share
 644  */
 645 int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
 646 {
 647         struct cifs_ses *ses = tcon->ses;
 648         struct TCP_Server_Info *server = ses->server;
 649         struct cifs_open_parms oparms;
 650         struct smb2_create_rsp *o_rsp = NULL;
 651         struct smb2_query_info_rsp *qi_rsp = NULL;
 652         int resp_buftype[2];
 653         struct smb_rqst rqst[2];
 654         struct kvec rsp_iov[2];
 655         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
 656         struct kvec qi_iov[1];
 657         int rc, flags = 0;
 658         __le16 utf16_path = 0; /* Null - since an open of top of share */
 659         u8 oplock = SMB2_OPLOCK_LEVEL_II;
 660
 661         mutex_lock(&tcon->crfid.fid_mutex);
 662         if (tcon->crfid.is_valid) {
 663                 cifs_dbg(FYI, "found a cached root file handle\n");
 664                 memcpy(pfid, tcon->crfid.fid, sizeof(struct cifs_fid));
 665                 kref_get(&tcon->crfid.refcount);
 666                 mutex_unlock(&tcon->crfid.fid_mutex);
 667                 return 0;
 668         }
 669
 670         if (smb3_encryption_required(tcon))
 671                 flags |= CIFS_TRANSFORM_REQ;
 672
 673         memset(rqst, 0, sizeof(rqst));
 674         resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
 675         memset(rsp_iov, 0, sizeof(rsp_iov));
 676
 677         /* Open */
 678         memset(&open_iov, 0, sizeof(open_iov));
 679         rqst[0].rq_iov = open_iov;
 680         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
 681
 682         oparms.tcon = tcon;
 683         oparms.create_options = 0;
 684         oparms.desired_access = FILE_READ_ATTRIBUTES;
 685         oparms.disposition = FILE_OPEN;
 686         oparms.fid = pfid;
 687         oparms.reconnect = false;
 688
 689         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, &utf16_path);
 690         if (rc)
 691                 goto oshr_exit;
 692         smb2_set_next_command(tcon, &rqst[0]);
 693
 694         memset(&qi_iov, 0, sizeof(qi_iov));
 695         rqst[1].rq_iov = qi_iov;
 696         rqst[1].rq_nvec = 1;
 697
 698         rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID,
 699                                   COMPOUND_FID, FILE_ALL_INFORMATION,
 700                                   SMB2_O_INFO_FILE, 0,
 701                                   sizeof(struct smb2_file_all_info) +
 702                                   PATH_MAX * 2, 0, NULL);
 703         if (rc)
 704                 goto oshr_exit;
 705
 706         smb2_set_related(&rqst[1]);
 707
 708         rc = compound_send_recv(xid, ses, flags, 2, rqst,
 709                                 resp_buftype, rsp_iov);
 710         if (rc)
 711                 goto oshr_exit;
 712
 713         o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
 714         oparms.fid->persistent_fid = o_rsp->PersistentFileId;
 715         oparms.fid->volatile_fid = o_rsp->VolatileFileId;
 716 #ifdef CONFIG_CIFS_DEBUG2
 717         oparms.fid->mid = le64_to_cpu(o_rsp->sync_hdr.MessageId);
 718 #endif /* CIFS_DEBUG2 */
 719
 720         memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid));
 721         tcon->crfid.tcon = tcon;
 722         tcon->crfid.is_valid = true;
 723         kref_init(&tcon->crfid.refcount);
 724
 725         if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) {
 726                 kref_get(&tcon->crfid.refcount);
 727                 oplock = smb2_parse_lease_state(server, o_rsp,
 728                                                 &oparms.fid->epoch,
 729                                                 oparms.fid->lease_key);
 730         } else
 731                 goto oshr_exit;
 732
 733         qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
 734         if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info))
 735                 goto oshr_exit;
 736         if (!smb2_validate_and_copy_iov(
 737                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 738                                 sizeof(struct smb2_file_all_info),
 739                                 &rsp_iov[1], sizeof(struct smb2_file_all_info),
 740                                 (char *)&tcon->crfid.file_all_info))
 741                 tcon->crfid.file_all_info_is_valid = 1;
 742
 743  oshr_exit:
 744         mutex_unlock(&tcon->crfid.fid_mutex);
 745         SMB2_open_free(&rqst[0]);
 746         SMB2_query_info_free(&rqst[1]);
 747         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 748         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 749         return rc;
 750 }
 751
 752 static void
 753 smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 754 {
 755         int rc;
 756         __le16 srch_path = 0; /* Null - open root of share */
 757         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 758         struct cifs_open_parms oparms;
 759         struct cifs_fid fid;
 760         bool no_cached_open = tcon->nohandlecache;
 761
 762         oparms.tcon = tcon;
 763         oparms.desired_access = FILE_READ_ATTRIBUTES;
 764         oparms.disposition = FILE_OPEN;
 765         oparms.create_options = 0;
 766         oparms.fid = &fid;
 767         oparms.reconnect = false;
 768
 769         if (no_cached_open)
 770                 rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
 771                                NULL);
 772         else
 773                 rc = open_shroot(xid, tcon, &fid);
 774
 775         if (rc)
 776                 return;
 777
 778         SMB3_request_interfaces(xid, tcon);
 779
 780         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 781                         FS_ATTRIBUTE_INFORMATION);
 782         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 783                         FS_DEVICE_INFORMATION);
 784         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 785                         FS_VOLUME_INFORMATION);
 786         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 787                         FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
 788         if (no_cached_open)
 789                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 790         else
 791                 close_shroot(&tcon->crfid);
 792
 793         return;
 794 }
 795
 796 static void
 797 smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 798 {
 799         int rc;
 800         __le16 srch_path = 0; /* Null - open root of share */
 801         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 802         struct cifs_open_parms oparms;
 803         struct cifs_fid fid;
 804
 805         oparms.tcon = tcon;
 806         oparms.desired_access = FILE_READ_ATTRIBUTES;
 807         oparms.disposition = FILE_OPEN;
 808         oparms.create_options = 0;
 809         oparms.fid = &fid;
 810         oparms.reconnect = false;
 811
 812         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL, NULL);
 813         if (rc)
 814                 return;
 815
 816         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 817                         FS_ATTRIBUTE_INFORMATION);
 818         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 819                         FS_DEVICE_INFORMATION);
 820         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 821         return;
 822 }
 823
 824 static int
 825 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 826                         struct cifs_sb_info *cifs_sb, const char *full_path)
 827 {
 828         int rc;
 829         __le16 *utf16_path;
 830         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 831         struct cifs_open_parms oparms;
 832         struct cifs_fid fid;
 833
 834         if ((*full_path == 0) && tcon->crfid.is_valid)
 835                 return 0;
 836
 837         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 838         if (!utf16_path)
 839                 return -ENOMEM;
 840
 841         oparms.tcon = tcon;
 842         oparms.desired_access = FILE_READ_ATTRIBUTES;
 843         oparms.disposition = FILE_OPEN;
 844         if (backup_cred(cifs_sb))
 845                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
 846         else
 847                 oparms.create_options = 0;
 848         oparms.fid = &fid;
 849         oparms.reconnect = false;
 850
 851         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
 852         if (rc) {
 853                 kfree(utf16_path);
 854                 return rc;
 855         }
 856
 857         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 858         kfree(utf16_path);
 859         return rc;
 860 }
 861
 862 static int
 863 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 864                   struct cifs_sb_info *cifs_sb, const char *full_path,
 865                   u64 *uniqueid, FILE_ALL_INFO *data)
 866 {
 867         *uniqueid = le64_to_cpu(data->IndexNumber);
 868         return 0;
 869 }
 870
 871 static int
 872 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 873                      struct cifs_fid *fid, FILE_ALL_INFO *data)
 874 {
 875         int rc;
 876         struct smb2_file_all_info *smb2_data;
 877
 878         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 879                             GFP_KERNEL);
 880         if (smb2_data == NULL)
 881                 return -ENOMEM;
 882
 883         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
 884                              smb2_data);
 885         if (!rc)
 886                 move_smb2_info_to_cifs(data, smb2_data);
 887         kfree(smb2_data);
 888         return rc;
 889 }
 890
 891 #ifdef CONFIG_CIFS_XATTR
 892 static ssize_t
 893 move_smb2_ea_to_cifs(char *dst, size_t dst_size,
 894                      struct smb2_file_full_ea_info *src, size_t src_size,
 895                      const unsigned char *ea_name)
 896 {
 897         int rc = 0;
 898         unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0;
 899         char *name, *value;
 900         size_t buf_size = dst_size;
 901         size_t name_len, value_len, user_name_len;
 902
 903         while (src_size > 0) {
 904                 name = &src->ea_data[0];
 905                 name_len = (size_t)src->ea_name_length;
 906                 value = &src->ea_data[src->ea_name_length + 1];
 907                 value_len = (size_t)le16_to_cpu(src->ea_value_length);
 908
 909                 if (name_len == 0) {
 910                         break;
 911                 }
 912
 913                 if (src_size < 8 + name_len + 1 + value_len) {
 914                         cifs_dbg(FYI, "EA entry goes beyond length of list\n");
 915                         rc = -EIO;
 916                         goto out;
 917                 }
 918
 919                 if (ea_name) {
 920                         if (ea_name_len == name_len &&
 921                             memcmp(ea_name, name, name_len) == 0) {
 922                                 rc = value_len;
 923                                 if (dst_size == 0)
 924                                         goto out;
 925                                 if (dst_size < value_len) {
 926                                         rc = -ERANGE;
 927                                         goto out;
 928                                 }
 929                                 memcpy(dst, value, value_len);
 930                                 goto out;
 931                         }
 932                 } else {
 933                         /* 'user.' plus a terminating null */
 934                         user_name_len = 5 + 1 + name_len;
 935
 936                         if (buf_size == 0) {
 937                                 /* skip copy - calc size only */
 938                                 rc += user_name_len;
 939                         } else if (dst_size >= user_name_len) {
 940                                 dst_size -= user_name_len;
 941                                 memcpy(dst, "user.", 5);
 942                                 dst += 5;
 943                                 memcpy(dst, src->ea_data, name_len);
 944                                 dst += name_len;
 945                                 *dst = 0;
 946                                 ++dst;
 947                                 rc += user_name_len;
 948                         } else {
 949                                 /* stop before overrun buffer */
 950                                 rc = -ERANGE;
 951                                 break;
 952                         }
 953                 }
 954
 955                 if (!src->next_entry_offset)
 956                         break;
 957
 958                 if (src_size < le32_to_cpu(src->next_entry_offset)) {
 959                         /* stop before overrun buffer */
 960                         rc = -ERANGE;
 961                         break;
 962                 }
 963                 src_size -= le32_to_cpu(src->next_entry_offset);
 964                 src = (void *)((char *)src +
 965                                le32_to_cpu(src->next_entry_offset));
 966         }
 967
 968         /* didn't find the named attribute */
 969         if (ea_name)
 970                 rc = -ENODATA;
 971
 972 out:
 973         return (ssize_t)rc;
 974 }
 975
 976 static ssize_t
 977 smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
 978                const unsigned char *path, const unsigned char *ea_name,
 979                char *ea_data, size_t buf_size,
 980                struct cifs_sb_info *cifs_sb)
 981 {
 982         int rc;
 983         __le16 *utf16_path;
 984         struct kvec rsp_iov = {NULL, 0};
 985         int buftype = CIFS_NO_BUFFER;
 986         struct smb2_query_info_rsp *rsp;
 987         struct smb2_file_full_ea_info *info = NULL;
 988
 989         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 990         if (!utf16_path)
 991                 return -ENOMEM;
 992
 993         rc = smb2_query_info_compound(xid, tcon, utf16_path,
 994                                       FILE_READ_EA,
 995                                       FILE_FULL_EA_INFORMATION,
 996                                       SMB2_O_INFO_FILE,
 997                                       CIFSMaxBufSize -
 998                                       MAX_SMB2_CREATE_RESPONSE_SIZE -
 999                                       MAX_SMB2_CLOSE_RESPONSE_SIZE,
1000                                       &rsp_iov, &buftype, cifs_sb);
1001         if (rc) {
1002                 /*
1003                  * If ea_name is NULL (listxattr) and there are no EAs,
1004                  * return 0 as it's not an error. Otherwise, the specified
1005                  * ea_name was not found.
1006                  */
1007                 if (!ea_name && rc == -ENODATA)
1008                         rc = 0;
1009                 goto qeas_exit;
1010         }
1011
1012         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
1013         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
1014                                le32_to_cpu(rsp->OutputBufferLength),
1015                                &rsp_iov,
1016                                sizeof(struct smb2_file_full_ea_info));
1017         if (rc)
1018                 goto qeas_exit;
1019
1020         info = (struct smb2_file_full_ea_info *)(
1021                         le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
1022         rc = move_smb2_ea_to_cifs(ea_data, buf_size, info,
1023                         le32_to_cpu(rsp->OutputBufferLength), ea_name);
1024
1025  qeas_exit:
1026         kfree(utf16_path);
1027         free_rsp_buf(buftype, rsp_iov.iov_base);
1028         return rc;
1029 }
1030
1031
1032 static int
1033 smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
1034             const char *path, const char *ea_name, const void *ea_value,
1035             const __u16 ea_value_len, const struct nls_table *nls_codepage,
1036             struct cifs_sb_info *cifs_sb)
1037 {
1038         struct cifs_ses *ses = tcon->ses;
1039         __le16 *utf16_path = NULL;
1040         int ea_name_len = strlen(ea_name);
1041         int flags = 0;
1042         int len;
1043         struct smb_rqst rqst[3];
1044         int resp_buftype[3];
1045         struct kvec rsp_iov[3];
1046         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1047         struct cifs_open_parms oparms;
1048         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1049         struct cifs_fid fid;
1050         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
1051         unsigned int size[1];
1052         void *data[1];
1053         struct smb2_file_full_ea_info *ea = NULL;
1054         struct kvec close_iov[1];
1055         int rc;
1056
1057         if (smb3_encryption_required(tcon))
1058                 flags |= CIFS_TRANSFORM_REQ;
1059
1060         if (ea_name_len > 255)
1061                 return -EINVAL;
1062
1063         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1064         if (!utf16_path)
1065                 return -ENOMEM;
1066
1067         memset(rqst, 0, sizeof(rqst));
1068         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1069         memset(rsp_iov, 0, sizeof(rsp_iov));
1070
1071         if (ses->server->ops->query_all_EAs) {
1072                 if (!ea_value) {
1073                         rc = ses->server->ops->query_all_EAs(xid, tcon, path,
1074                                                              ea_name, NULL, 0,
1075                                                              cifs_sb);
1076                         if (rc == -ENODATA)
1077                                 goto sea_exit;
1078                 }
1079         }
1080
1081         /* Open */
1082         memset(&open_iov, 0, sizeof(open_iov));
1083         rqst[0].rq_iov = open_iov;
1084         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1085
1086         memset(&oparms, 0, sizeof(oparms));
1087         oparms.tcon = tcon;
1088         oparms.desired_access = FILE_WRITE_EA;
1089         oparms.disposition = FILE_OPEN;
1090         if (backup_cred(cifs_sb))
1091                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1092         else
1093                 oparms.create_options = 0;
1094         oparms.fid = &fid;
1095         oparms.reconnect = false;
1096
1097         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path);
1098         if (rc)
1099                 goto sea_exit;
1100         smb2_set_next_command(tcon, &rqst[0]);
1101
1102
1103         /* Set Info */
1104         memset(&si_iov, 0, sizeof(si_iov));
1105         rqst[1].rq_iov = si_iov;
1106         rqst[1].rq_nvec = 1;
1107
1108         len = sizeof(ea) + ea_name_len + ea_value_len + 1;
1109         ea = kzalloc(len, GFP_KERNEL);
1110         if (ea == NULL) {
1111                 rc = -ENOMEM;
1112                 goto sea_exit;
1113         }
1114
1115         ea->ea_name_length = ea_name_len;
1116         ea->ea_value_length = cpu_to_le16(ea_value_len);
1117         memcpy(ea->ea_data, ea_name, ea_name_len + 1);
1118         memcpy(ea->ea_data + ea_name_len + 1, ea_value, ea_value_len);
1119
1120         size[0] = len;
1121         data[0] = ea;
1122
1123         rc = SMB2_set_info_init(tcon, &rqst[1], COMPOUND_FID,
1124                                 COMPOUND_FID, current->tgid,
1125                                 FILE_FULL_EA_INFORMATION,
1126                                 SMB2_O_INFO_FILE, 0, data, size);
1127         smb2_set_next_command(tcon, &rqst[1]);
1128         smb2_set_related(&rqst[1]);
1129
1130
1131         /* Close */
1132         memset(&close_iov, 0, sizeof(close_iov));
1133         rqst[2].rq_iov = close_iov;
1134         rqst[2].rq_nvec = 1;
1135         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
1136         smb2_set_related(&rqst[2]);
1137
1138         rc = compound_send_recv(xid, ses, flags, 3, rqst,
1139                                 resp_buftype, rsp_iov);
1140
1141  sea_exit:
1142         kfree(ea);
1143         kfree(utf16_path);
1144         SMB2_open_free(&rqst[0]);
1145         SMB2_set_info_free(&rqst[1]);
1146         SMB2_close_free(&rqst[2]);
1147         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1148         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1149         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1150         return rc;
1151 }
1152 #endif
1153
1154 static bool
1155 smb2_can_echo(struct TCP_Server_Info *server)
1156 {
1157         return server->echoes;
1158 }
1159
1160 static void
1161 smb2_clear_stats(struct cifs_tcon *tcon)
1162 {
1163         int i;
1164         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
1165                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
1166                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
1167         }
1168 }
1169
1170 static void
1171 smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
1172 {
1173         seq_puts(m, "\n\tShare Capabilities:");
1174         if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
1175                 seq_puts(m, " DFS,");
1176         if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
1177                 seq_puts(m, " CONTINUOUS AVAILABILITY,");
1178         if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
1179                 seq_puts(m, " SCALEOUT,");
1180         if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
1181                 seq_puts(m, " CLUSTER,");
1182         if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
1183                 seq_puts(m, " ASYMMETRIC,");
1184         if (tcon->capabilities == 0)
1185                 seq_puts(m, " None");
1186         if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
1187                 seq_puts(m, " Aligned,");
1188         if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
1189                 seq_puts(m, " Partition Aligned,");
1190         if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
1191                 seq_puts(m, " SSD,");
1192         if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
1193                 seq_puts(m, " TRIM-support,");
1194
1195         seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
1196         seq_printf(m, "\n\ttid: 0x%x", tcon->tid);
1197         if (tcon->perf_sector_size)
1198                 seq_printf(m, "\tOptimal sector size: 0x%x",
1199                            tcon->perf_sector_size);
1200         seq_printf(m, "\tMaximal Access: 0x%x", tcon->maximal_access);
1201 }
1202
1203 static void
1204 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
1205 {
1206         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
1207         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
1208
1209         /*
1210          *  Can't display SMB2_NEGOTIATE, SESSION_SETUP, LOGOFF, CANCEL and ECHO
1211          *  totals (requests sent) since those SMBs are per-session not per tcon
1212          */
1213         seq_printf(m, "\nBytes read: %llu  Bytes written: %llu",
1214                    (long long)(tcon->bytes_read),
1215                    (long long)(tcon->bytes_written));
1216         seq_printf(m, "\nOpen files: %d total (local), %d open on server",
1217                    atomic_read(&tcon->num_local_opens),
1218                    atomic_read(&tcon->num_remote_opens));
1219         seq_printf(m, "\nTreeConnects: %d total %d failed",
1220                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
1221                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
1222         seq_printf(m, "\nTreeDisconnects: %d total %d failed",
1223                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
1224                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
1225         seq_printf(m, "\nCreates: %d total %d failed",
1226                    atomic_read(&sent[SMB2_CREATE_HE]),
1227                    atomic_read(&failed[SMB2_CREATE_HE]));
1228         seq_printf(m, "\nCloses: %d total %d failed",
1229                    atomic_read(&sent[SMB2_CLOSE_HE]),
1230                    atomic_read(&failed[SMB2_CLOSE_HE]));
1231         seq_printf(m, "\nFlushes: %d total %d failed",
1232                    atomic_read(&sent[SMB2_FLUSH_HE]),
1233                    atomic_read(&failed[SMB2_FLUSH_HE]));
1234         seq_printf(m, "\nReads: %d total %d failed",
1235                    atomic_read(&sent[SMB2_READ_HE]),
1236                    atomic_read(&failed[SMB2_READ_HE]));
1237         seq_printf(m, "\nWrites: %d total %d failed",
1238                    atomic_read(&sent[SMB2_WRITE_HE]),
1239                    atomic_read(&failed[SMB2_WRITE_HE]));
1240         seq_printf(m, "\nLocks: %d total %d failed",
1241                    atomic_read(&sent[SMB2_LOCK_HE]),
1242                    atomic_read(&failed[SMB2_LOCK_HE]));
1243         seq_printf(m, "\nIOCTLs: %d total %d failed",
1244                    atomic_read(&sent[SMB2_IOCTL_HE]),
1245                    atomic_read(&failed[SMB2_IOCTL_HE]));
1246         seq_printf(m, "\nQueryDirectories: %d total %d failed",
1247                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
1248                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
1249         seq_printf(m, "\nChangeNotifies: %d total %d failed",
1250                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
1251                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
1252         seq_printf(m, "\nQueryInfos: %d total %d failed",
1253                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
1254                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
1255         seq_printf(m, "\nSetInfos: %d total %d failed",
1256                    atomic_read(&sent[SMB2_SET_INFO_HE]),
1257                    atomic_read(&failed[SMB2_SET_INFO_HE]));
1258         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
1259                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
1260                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
1261 }
1262
1263 static void
1264 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
1265 {
1266         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
1267         struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
1268
1269         cfile->fid.persistent_fid = fid->persistent_fid;
1270         cfile->fid.volatile_fid = fid->volatile_fid;
1271 #ifdef CONFIG_CIFS_DEBUG2
1272         cfile->fid.mid = fid->mid;
1273 #endif /* CIFS_DEBUG2 */
1274         server->ops->set_oplock_level(cinode, oplock, fid->epoch,
1275                                       &fid->purge_cache);
1276         cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
1277         memcpy(cfile->fid.create_guid, fid->create_guid, 16);
1278 }
1279
1280 static void
1281 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
1282                 struct cifs_fid *fid)
1283 {
1284         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1285 }
1286
1287 static int
1288 SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
1289                      u64 persistent_fid, u64 volatile_fid,
1290                      struct copychunk_ioctl *pcchunk)
1291 {
1292         int rc;
1293         unsigned int ret_data_len;
1294         struct resume_key_req *res_key;
1295
1296         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1297                         FSCTL_SRV_REQUEST_RESUME_KEY, true /* is_fsctl */,
1298                         NULL, 0 /* no input */, CIFSMaxBufSize,
1299                         (char **)&res_key, &ret_data_len);
1300
1301         if (rc) {
1302                 cifs_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
1303                 goto req_res_key_exit;
1304         }
1305         if (ret_data_len < sizeof(struct resume_key_req)) {
1306                 cifs_dbg(VFS, "Invalid refcopy resume key length\n");
1307                 rc = -EINVAL;
1308                 goto req_res_key_exit;
1309         }
1310         memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
1311
1312 req_res_key_exit:
1313         kfree(res_key);
1314         return rc;
1315 }
1316
1317 static int
1318 smb2_ioctl_query_info(const unsigned int xid,
1319                       struct cifs_tcon *tcon,
1320                       __le16 *path, int is_dir,
1321                       unsigned long p)
1322 {
1323         struct cifs_ses *ses = tcon->ses;
1324         char __user *arg = (char __user *)p;
1325         struct smb_query_info qi;
1326         struct smb_query_info __user *pqi;
1327         int rc = 0;
1328         int flags = 0;
1329         struct smb2_query_info_rsp *qi_rsp = NULL;
1330         struct smb2_ioctl_rsp *io_rsp = NULL;
1331         void *buffer = NULL;
1332         struct smb_rqst rqst[3];
1333         int resp_buftype[3];
1334         struct kvec rsp_iov[3];
1335         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1336         struct cifs_open_parms oparms;
1337         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1338         struct cifs_fid fid;
1339         struct kvec qi_iov[1];
1340         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
1341         struct kvec close_iov[1];
1342
1343         memset(rqst, 0, sizeof(rqst));
1344         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1345         memset(rsp_iov, 0, sizeof(rsp_iov));
1346
1347         if (copy_from_user(&qi, arg, sizeof(struct smb_query_info)))
1348                 return -EFAULT;
1349
1350         if (qi.output_buffer_length > 1024)
1351                 return -EINVAL;
1352
1353         if (!ses || !(ses->server))
1354                 return -EIO;
1355
1356         if (smb3_encryption_required(tcon))
1357                 flags |= CIFS_TRANSFORM_REQ;
1358
1359         buffer = kmalloc(qi.output_buffer_length, GFP_KERNEL);
1360         if (buffer == NULL)
1361                 return -ENOMEM;
1362
1363         if (copy_from_user(buffer, arg + sizeof(struct smb_query_info),
1364                            qi.output_buffer_length)) {
1365                 rc = -EFAULT;
1366                 goto iqinf_exit;
1367         }
1368
1369         /* Open */
1370         memset(&open_iov, 0, sizeof(open_iov));
1371         rqst[0].rq_iov = open_iov;
1372         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1373
1374         memset(&oparms, 0, sizeof(oparms));
1375         oparms.tcon = tcon;
1376         oparms.desired_access = FILE_READ_ATTRIBUTES | READ_CONTROL;
1377         oparms.disposition = FILE_OPEN;
1378         if (is_dir)
1379                 oparms.create_options = CREATE_NOT_FILE;
1380         else
1381                 oparms.create_options = CREATE_NOT_DIR;
1382         oparms.fid = &fid;
1383         oparms.reconnect = false;
1384
1385         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, path);
1386         if (rc)
1387                 goto iqinf_exit;
1388         smb2_set_next_command(tcon, &rqst[0]);
1389
1390         /* Query */
1391         if (qi.flags & PASSTHRU_FSCTL) {
1392                 /* Can eventually relax perm check since server enforces too */
1393                 if (!capable(CAP_SYS_ADMIN))
1394                         rc = -EPERM;
1395                 else  {
1396                         memset(&io_iov, 0, sizeof(io_iov));
1397                         rqst[1].rq_iov = io_iov;
1398                         rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
1399
1400                         rc = SMB2_ioctl_init(tcon, &rqst[1],
1401                                              COMPOUND_FID, COMPOUND_FID,
1402                                              qi.info_type, true, NULL,
1403                                              0, CIFSMaxBufSize);
1404                 }
1405         } else if (qi.flags == PASSTHRU_QUERY_INFO) {
1406                 memset(&qi_iov, 0, sizeof(qi_iov));
1407                 rqst[1].rq_iov = qi_iov;
1408                 rqst[1].rq_nvec = 1;
1409
1410                 rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID,
1411                                   COMPOUND_FID, qi.file_info_class,
1412                                   qi.info_type, qi.additional_information,
1413                                   qi.input_buffer_length,
1414                                   qi.output_buffer_length, buffer);
1415         } else { /* unknown flags */
1416                 cifs_dbg(VFS, "invalid passthru query flags: 0x%x\n", qi.flags);
1417                 rc = -EINVAL;
1418         }
1419
1420         if (rc)
1421                 goto iqinf_exit;
1422         smb2_set_next_command(tcon, &rqst[1]);
1423         smb2_set_related(&rqst[1]);
1424
1425         /* Close */
1426         memset(&close_iov, 0, sizeof(close_iov));
1427         rqst[2].rq_iov = close_iov;
1428         rqst[2].rq_nvec = 1;
1429
1430         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
1431         if (rc)
1432                 goto iqinf_exit;
1433         smb2_set_related(&rqst[2]);
1434
1435         rc = compound_send_recv(xid, ses, flags, 3, rqst,
1436                                 resp_buftype, rsp_iov);
1437         if (rc)
1438                 goto iqinf_exit;
1439         if (qi.flags & PASSTHRU_FSCTL) {
1440                 pqi = (struct smb_query_info __user *)arg;
1441                 io_rsp = (struct smb2_ioctl_rsp *)rsp_iov[1].iov_base;
1442                 if (le32_to_cpu(io_rsp->OutputCount) < qi.input_buffer_length)
1443                         qi.input_buffer_length = le32_to_cpu(io_rsp->OutputCount);
1444                 if (copy_to_user(&pqi->input_buffer_length, &qi.input_buffer_length,
1445                                  sizeof(qi.input_buffer_length))) {
1446                         rc = -EFAULT;
1447                         goto iqinf_exit;
1448                 }
1449                 if (copy_to_user(pqi + 1, &io_rsp[1], qi.input_buffer_length)) {
1450                         rc = -EFAULT;
1451                         goto iqinf_exit;
1452                 }
1453         } else {
1454                 pqi = (struct smb_query_info __user *)arg;
1455                 qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
1456                 if (le32_to_cpu(qi_rsp->OutputBufferLength) < qi.input_buffer_length)
1457                         qi.input_buffer_length = le32_to_cpu(qi_rsp->OutputBufferLength);
1458                 if (copy_to_user(&pqi->input_buffer_length, &qi.input_buffer_length,
1459                                  sizeof(qi.input_buffer_length))) {
1460                         rc = -EFAULT;
1461                         goto iqinf_exit;
1462                 }
1463                 if (copy_to_user(pqi + 1, qi_rsp->Buffer, qi.input_buffer_length)) {
1464                         rc = -EFAULT;
1465                         goto iqinf_exit;
1466                 }
1467         }
1468
1469  iqinf_exit:
1470         kfree(buffer);
1471         SMB2_open_free(&rqst[0]);
1472         if (qi.flags & PASSTHRU_FSCTL)
1473                 SMB2_ioctl_free(&rqst[1]);
1474         else
1475                 SMB2_query_info_free(&rqst[1]);
1476
1477         SMB2_close_free(&rqst[2]);
1478         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1479         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1480         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1481         return rc;
1482 }
1483
1484 static ssize_t
1485 smb2_copychunk_range(const unsigned int xid,
1486                         struct cifsFileInfo *srcfile,
1487                         struct cifsFileInfo *trgtfile, u64 src_off,
1488                         u64 len, u64 dest_off)
1489 {
1490         int rc;
1491         unsigned int ret_data_len;
1492         struct copychunk_ioctl *pcchunk;
1493         struct copychunk_ioctl_rsp *retbuf = NULL;
1494         struct cifs_tcon *tcon;
1495         int chunks_copied = 0;
1496         bool chunk_sizes_updated = false;
1497         ssize_t bytes_written, total_bytes_written = 0;
1498
1499         pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
1500
1501         if (pcchunk == NULL)
1502                 return -ENOMEM;
1503
1504         cifs_dbg(FYI, "in smb2_copychunk_range - about to call request res key\n");
1505         /* Request a key from the server to identify the source of the copy */
1506         rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
1507                                 srcfile->fid.persistent_fid,
1508                                 srcfile->fid.volatile_fid, pcchunk);
1509
1510         /* Note: request_res_key sets res_key null only if rc !=0 */
1511         if (rc)
1512                 goto cchunk_out;
1513
1514         /* For now array only one chunk long, will make more flexible later */
1515         pcchunk->ChunkCount = cpu_to_le32(1);
1516         pcchunk->Reserved = 0;
1517         pcchunk->Reserved2 = 0;
1518
1519         tcon = tlink_tcon(trgtfile->tlink);
1520
1521         while (len > 0) {
1522                 pcchunk->SourceOffset = cpu_to_le64(src_off);
1523                 pcchunk->TargetOffset = cpu_to_le64(dest_off);
1524                 pcchunk->Length =
1525                         cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));
1526
1527                 /* Request server copy to target from src identified by key */
1528                 rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1529                         trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
1530                         true /* is_fsctl */, (char *)pcchunk,
1531                         sizeof(struct copychunk_ioctl), CIFSMaxBufSize,
1532                         (char **)&retbuf, &ret_data_len);
1533                 if (rc == 0) {
1534                         if (ret_data_len !=
1535                                         sizeof(struct copychunk_ioctl_rsp)) {
1536                                 cifs_dbg(VFS, "invalid cchunk response size\n");
1537                                 rc = -EIO;
1538                                 goto cchunk_out;
1539                         }
1540                         if (retbuf->TotalBytesWritten == 0) {
1541                                 cifs_dbg(FYI, "no bytes copied\n");
1542                                 rc = -EIO;
1543                                 goto cchunk_out;
1544                         }
1545                         /*
1546                          * Check if server claimed to write more than we asked
1547                          */
1548                         if (le32_to_cpu(retbuf->TotalBytesWritten) >
1549                             le32_to_cpu(pcchunk->Length)) {
1550                                 cifs_dbg(VFS, "invalid copy chunk response\n");
1551                                 rc = -EIO;
1552                                 goto cchunk_out;
1553                         }
1554                         if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
1555                                 cifs_dbg(VFS, "invalid num chunks written\n");
1556                                 rc = -EIO;
1557                                 goto cchunk_out;
1558                         }
1559                         chunks_copied++;
1560
1561                         bytes_written = le32_to_cpu(retbuf->TotalBytesWritten);
1562                         src_off += bytes_written;
1563                         dest_off += bytes_written;
1564                         len -= bytes_written;
1565                         total_bytes_written += bytes_written;
1566
1567                         cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %zu\n",
1568                                 le32_to_cpu(retbuf->ChunksWritten),
1569                                 le32_to_cpu(retbuf->ChunkBytesWritten),
1570                                 bytes_written);
1571                 } else if (rc == -EINVAL) {
1572                         if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
1573                                 goto cchunk_out;
1574
1575                         cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
1576                                 le32_to_cpu(retbuf->ChunksWritten),
1577                                 le32_to_cpu(retbuf->ChunkBytesWritten),
1578                                 le32_to_cpu(retbuf->TotalBytesWritten));
1579
1580                         /*
1581                          * Check if this is the first request using these sizes,
1582                          * (ie check if copy succeed once with original sizes
1583                          * and check if the server gave us different sizes after
1584                          * we already updated max sizes on previous request).
1585                          * if not then why is the server returning an error now
1586                          */
1587                         if ((chunks_copied != 0) || chunk_sizes_updated)
1588                                 goto cchunk_out;
1589
1590                         /* Check that server is not asking us to grow size */
1591                         if (le32_to_cpu(retbuf->ChunkBytesWritten) <
1592                                         tcon->max_bytes_chunk)
1593                                 tcon->max_bytes_chunk =
1594                                         le32_to_cpu(retbuf->ChunkBytesWritten);
1595                         else
1596                                 goto cchunk_out; /* server gave us bogus size */
1597
1598                         /* No need to change MaxChunks since already set to 1 */
1599                         chunk_sizes_updated = true;
1600                 } else
1601                         goto cchunk_out;
1602         }
1603
1604 cchunk_out:
1605         kfree(pcchunk);
1606         kfree(retbuf);
1607         if (rc)
1608                 return rc;
1609         else
1610                 return total_bytes_written;
1611 }
1612
1613 static int
1614 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
1615                 struct cifs_fid *fid)
1616 {
1617         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1618 }
1619
1620 static unsigned int
1621 smb2_read_data_offset(char *buf)
1622 {
1623         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1624         return rsp->DataOffset;
1625 }
1626
1627 static unsigned int
1628 smb2_read_data_length(char *buf, bool in_remaining)
1629 {
1630         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1631
1632         if (in_remaining)
1633                 return le32_to_cpu(rsp->DataRemaining);
1634
1635         return le32_to_cpu(rsp->DataLength);
1636 }
1637
1638
1639 static int
1640 smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
1641                struct cifs_io_parms *parms, unsigned int *bytes_read,
1642                char **buf, int *buf_type)
1643 {
1644         parms->persistent_fid = pfid->persistent_fid;
1645         parms->volatile_fid = pfid->volatile_fid;
1646         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
1647 }
1648
1649 static int
1650 smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
1651                 struct cifs_io_parms *parms, unsigned int *written,
1652                 struct kvec *iov, unsigned long nr_segs)
1653 {
1654
1655         parms->persistent_fid = pfid->persistent_fid;
1656         parms->volatile_fid = pfid->volatile_fid;
1657         return SMB2_write(xid, parms, written, iov, nr_segs);
1658 }
1659
1660 /* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
1661 static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
1662                 struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
1663 {
1664         struct cifsInodeInfo *cifsi;
1665         int rc;
1666
1667         cifsi = CIFS_I(inode);
1668
1669         /* if file already sparse don't bother setting sparse again */
1670         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
1671                 return true; /* already sparse */
1672
1673         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
1674                 return true; /* already not sparse */
1675
1676         /*
1677          * Can't check for sparse support on share the usual way via the
1678          * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
1679          * since Samba server doesn't set the flag on the share, yet
1680          * supports the set sparse FSCTL and returns sparse correctly
1681          * in the file attributes. If we fail setting sparse though we
1682          * mark that server does not support sparse files for this share
1683          * to avoid repeatedly sending the unsupported fsctl to server
1684          * if the file is repeatedly extended.
1685          */
1686         if (tcon->broken_sparse_sup)
1687                 return false;
1688
1689         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1690                         cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
1691                         true /* is_fctl */,
1692                         &setsparse, 1, CIFSMaxBufSize, NULL, NULL);
1693         if (rc) {
1694                 tcon->broken_sparse_sup = true;
1695                 cifs_dbg(FYI, "set sparse rc = %d\n", rc);
1696                 return false;
1697         }
1698
1699         if (setsparse)
1700                 cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
1701         else
1702                 cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
1703
1704         return true;
1705 }
1706
1707 static int
1708 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
1709                    struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
1710 {
1711         __le64 eof = cpu_to_le64(size);
1712         struct inode *inode;
1713
1714         /*
1715          * If extending file more than one page make sparse. Many Linux fs
1716          * make files sparse by default when extending via ftruncate
1717          */
1718         inode = d_inode(cfile->dentry);
1719
1720         if (!set_alloc && (size > inode->i_size + 8192)) {
1721                 __u8 set_sparse = 1;
1722
1723                 /* whether set sparse succeeds or not, extend the file */
1724                 smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
1725         }
1726
1727         return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
1728                             cfile->fid.volatile_fid, cfile->pid, &eof);
1729 }
1730
1731 static int
1732 smb2_duplicate_extents(const unsigned int xid,
1733                         struct cifsFileInfo *srcfile,
1734                         struct cifsFileInfo *trgtfile, u64 src_off,
1735                         u64 len, u64 dest_off)
1736 {
1737         int rc;
1738         unsigned int ret_data_len;
1739         struct duplicate_extents_to_file dup_ext_buf;
1740         struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
1741
1742         /* server fileays advertise duplicate extent support with this flag */
1743         if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
1744              FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
1745                 return -EOPNOTSUPP;
1746
1747         dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
1748         dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
1749         dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
1750         dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
1751         dup_ext_buf.ByteCount = cpu_to_le64(len);
1752         cifs_dbg(FYI, "duplicate extents: src off %lld dst off %lld len %lld",
1753                 src_off, dest_off, len);
1754
1755         rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
1756         if (rc)
1757                 goto duplicate_extents_out;
1758
1759         rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1760                         trgtfile->fid.volatile_fid,
1761                         FSCTL_DUPLICATE_EXTENTS_TO_FILE,
1762                         true /* is_fsctl */,
1763                         (char *)&dup_ext_buf,
1764                         sizeof(struct duplicate_extents_to_file),
1765                         CIFSMaxBufSize, NULL,
1766                         &ret_data_len);
1767
1768         if (ret_data_len > 0)
1769                 cifs_dbg(FYI, "non-zero response length in duplicate extents");
1770
1771 duplicate_extents_out:
1772         return rc;
1773 }
1774
1775 static int
1776 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1777                    struct cifsFileInfo *cfile)
1778 {
1779         return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
1780                             cfile->fid.volatile_fid);
1781 }
1782
1783 static int
1784 smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
1785                    struct cifsFileInfo *cfile)
1786 {
1787         struct fsctl_set_integrity_information_req integr_info;
1788         unsigned int ret_data_len;
1789
1790         integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
1791         integr_info.Flags = 0;
1792         integr_info.Reserved = 0;
1793
1794         return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1795                         cfile->fid.volatile_fid,
1796                         FSCTL_SET_INTEGRITY_INFORMATION,
1797                         true /* is_fsctl */,
1798                         (char *)&integr_info,
1799                         sizeof(struct fsctl_set_integrity_information_req),
1800                         CIFSMaxBufSize, NULL,
1801                         &ret_data_len);
1802
1803 }
1804
1805 /* GMT Token is @GMT-YYYY.MM.DD-HH.MM.SS Unicode which is 48 bytes + null */
1806 #define GMT_TOKEN_SIZE 50
1807
1808 #define MIN_SNAPSHOT_ARRAY_SIZE 16 /* See MS-SMB2 section 3.3.5.15.1 */
1809
1810 /*
1811  * Input buffer contains (empty) struct smb_snapshot array with size filled in
1812  * For output see struct SRV_SNAPSHOT_ARRAY in MS-SMB2 section 2.2.32.2
1813  */
1814 static int
1815 smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
1816                    struct cifsFileInfo *cfile, void __user *ioc_buf)
1817 {
1818         char *retbuf = NULL;
1819         unsigned int ret_data_len = 0;
1820         int rc;
1821         u32 max_response_size;
1822         struct smb_snapshot_array snapshot_in;
1823
1824         if (get_user(ret_data_len, (unsigned int __user *)ioc_buf))
1825                 return -EFAULT;
1826
1827         /*
1828          * Note that for snapshot queries that servers like Azure expect that
1829          * the first query be minimal size (and just used to get the number/size
1830          * of previous versions) so response size must be specified as EXACTLY
1831          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
1832          * of eight bytes.
1833          */
1834         if (ret_data_len == 0)
1835                 max_response_size = MIN_SNAPSHOT_ARRAY_SIZE;
1836         else
1837                 max_response_size = CIFSMaxBufSize;
1838
1839         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1840                         cfile->fid.volatile_fid,
1841                         FSCTL_SRV_ENUMERATE_SNAPSHOTS,
1842                         true /* is_fsctl */,
1843                         NULL, 0 /* no input data */, max_response_size,
1844                         (char **)&retbuf,
1845                         &ret_data_len);
1846         cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d\n",
1847                         rc, ret_data_len);
1848         if (rc)
1849                 return rc;
1850
1851         if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) {
1852                 /* Fixup buffer */
1853                 if (copy_from_user(&snapshot_in, ioc_buf,
1854                     sizeof(struct smb_snapshot_array))) {
1855                         rc = -EFAULT;
1856                         kfree(retbuf);
1857                         return rc;
1858                 }
1859
1860                 /*
1861                  * Check for min size, ie not large enough to fit even one GMT
1862                  * token (snapshot).  On the first ioctl some users may pass in
1863                  * smaller size (or zero) to simply get the size of the array
1864                  * so the user space caller can allocate sufficient memory
1865                  * and retry the ioctl again with larger array size sufficient
1866                  * to hold all of the snapshot GMT tokens on the second try.
1867                  */
1868                 if (snapshot_in.snapshot_array_size < GMT_TOKEN_SIZE)
1869                         ret_data_len = sizeof(struct smb_snapshot_array);
1870
1871                 /*
1872                  * We return struct SRV_SNAPSHOT_ARRAY, followed by
1873                  * the snapshot array (of 50 byte GMT tokens) each
1874                  * representing an available previous version of the data
1875                  */
1876                 if (ret_data_len > (snapshot_in.snapshot_array_size +
1877                                         sizeof(struct smb_snapshot_array)))
1878                         ret_data_len = snapshot_in.snapshot_array_size +
1879                                         sizeof(struct smb_snapshot_array);
1880
1881                 if (copy_to_user(ioc_buf, retbuf, ret_data_len))
1882                         rc = -EFAULT;
1883         }
1884
1885         kfree(retbuf);
1886         return rc;
1887 }
1888
1889 static int
1890 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
1891                      const char *path, struct cifs_sb_info *cifs_sb,
1892                      struct cifs_fid *fid, __u16 search_flags,
1893                      struct cifs_search_info *srch_inf)
1894 {
1895         __le16 *utf16_path;
1896         int rc;
1897         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1898         struct cifs_open_parms oparms;
1899
1900         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1901         if (!utf16_path)
1902                 return -ENOMEM;
1903
1904         oparms.tcon = tcon;
1905         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
1906         oparms.disposition = FILE_OPEN;
1907         if (backup_cred(cifs_sb))
1908                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1909         else
1910                 oparms.create_options = 0;
1911         oparms.fid = fid;
1912         oparms.reconnect = false;
1913
1914         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
1915         kfree(utf16_path);
1916         if (rc) {
1917                 cifs_dbg(FYI, "open dir failed rc=%d\n", rc);
1918                 return rc;
1919         }
1920
1921         srch_inf->entries_in_buffer = 0;
1922         srch_inf->index_of_last_entry = 2;
1923
1924         rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
1925                                   fid->volatile_fid, 0, srch_inf);
1926         if (rc) {
1927                 cifs_dbg(FYI, "query directory failed rc=%d\n", rc);
1928                 SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1929         }
1930         return rc;
1931 }
1932
1933 static int
1934 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
1935                     struct cifs_fid *fid, __u16 search_flags,
1936                     struct cifs_search_info *srch_inf)
1937 {
1938         return SMB2_query_directory(xid, tcon, fid->persistent_fid,
1939                                     fid->volatile_fid, 0, srch_inf);
1940 }
1941
1942 static int
1943 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
1944                struct cifs_fid *fid)
1945 {
1946         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1947 }
1948
1949 /*
1950 * If we negotiate SMB2 protocol and get STATUS_PENDING - update
1951 * the number of credits and return true. Otherwise - return false.
1952 */
1953 static bool
1954 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server)
1955 {
1956         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
1957
1958         if (shdr->Status != STATUS_PENDING)
1959                 return false;
1960
1961         if (shdr->CreditRequest) {
1962                 spin_lock(&server->req_lock);
1963                 server->credits += le16_to_cpu(shdr->CreditRequest);
1964                 spin_unlock(&server->req_lock);
1965                 wake_up(&server->request_q);
1966         }
1967
1968         return true;
1969 }
1970
1971 static bool
1972 smb2_is_session_expired(char *buf)
1973 {
1974         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
1975
1976         if (shdr->Status != STATUS_NETWORK_SESSION_EXPIRED &&
1977             shdr->Status != STATUS_USER_SESSION_DELETED)
1978                 return false;
1979
1980         trace_smb3_ses_expired(shdr->TreeId, shdr->SessionId,
1981                                le16_to_cpu(shdr->Command),
1982                                le64_to_cpu(shdr->MessageId));
1983         cifs_dbg(FYI, "Session expired or deleted\n");
1984
1985         return true;
1986 }
1987
1988 static int
1989 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
1990                      struct cifsInodeInfo *cinode)
1991 {
1992         if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
1993                 return SMB2_lease_break(0, tcon, cinode->lease_key,
1994                                         smb2_get_lease_state(cinode));
1995
1996         return SMB2_oplock_break(0, tcon, fid->persistent_fid,
1997                                  fid->volatile_fid,
1998                                  CIFS_CACHE_READ(cinode) ? 1 : 0);
1999 }
2000
2001 void
2002 smb2_set_related(struct smb_rqst *rqst)
2003 {
2004         struct smb2_sync_hdr *shdr;
2005
2006         shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
2007         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2008 }
2009
2010 char smb2_padding[7] = {0, 0, 0, 0, 0, 0, 0};
2011
2012 void
2013 smb2_set_next_command(struct cifs_tcon *tcon, struct smb_rqst *rqst)
2014 {
2015         struct smb2_sync_hdr *shdr;
2016         struct cifs_ses *ses = tcon->ses;
2017         struct TCP_Server_Info *server = ses->server;
2018         unsigned long len = smb_rqst_len(server, rqst);
2019         int i, num_padding;
2020
2021         /* SMB headers in a compound are 8 byte aligned. */
2022
2023         /* No padding needed */
2024         if (!(len & 7))
2025                 goto finished;
2026
2027         num_padding = 8 - (len & 7);
2028         if (!smb3_encryption_required(tcon)) {
2029                 /*
2030                  * If we do not have encryption then we can just add an extra
2031                  * iov for the padding.
2032                  */
2033                 rqst->rq_iov[rqst->rq_nvec].iov_base = smb2_padding;
2034                 rqst->rq_iov[rqst->rq_nvec].iov_len = num_padding;
2035                 rqst->rq_nvec++;
2036                 len += num_padding;
2037         } else {
2038                 /*
2039                  * We can not add a small padding iov for the encryption case
2040                  * because the encryption framework can not handle the padding
2041                  * iovs.
2042                  * We have to flatten this into a single buffer and add
2043                  * the padding to it.
2044                  */
2045                 for (i = 1; i < rqst->rq_nvec; i++) {
2046                         memcpy(rqst->rq_iov[0].iov_base +
2047                                rqst->rq_iov[0].iov_len,
2048                                rqst->rq_iov[i].iov_base,
2049                                rqst->rq_iov[i].iov_len);
2050                         rqst->rq_iov[0].iov_len += rqst->rq_iov[i].iov_len;
2051                 }
2052                 memset(rqst->rq_iov[0].iov_base + rqst->rq_iov[0].iov_len,
2053                        0, num_padding);
2054                 rqst->rq_iov[0].iov_len += num_padding;
2055                 len += num_padding;
2056                 rqst->rq_nvec = 1;
2057         }
2058
2059  finished:
2060         shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
2061         shdr->NextCommand = cpu_to_le32(len);
2062 }
2063
2064 /*
2065  * Passes the query info response back to the caller on success.
2066  * Caller need to free this with free_rsp_buf().
2067  */
2068 int
2069 smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
2070                          __le16 *utf16_path, u32 desired_access,
2071                          u32 class, u32 type, u32 output_len,
2072                          struct kvec *rsp, int *buftype,
2073                          struct cifs_sb_info *cifs_sb)
2074 {
2075         struct cifs_ses *ses = tcon->ses;
2076         int flags = 0;
2077         struct smb_rqst rqst[3];
2078         int resp_buftype[3];
2079         struct kvec rsp_iov[3];
2080         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2081         struct kvec qi_iov[1];
2082         struct kvec close_iov[1];
2083         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2084         struct cifs_open_parms oparms;
2085         struct cifs_fid fid;
2086         int rc;
2087
2088         if (smb3_encryption_required(tcon))
2089                 flags |= CIFS_TRANSFORM_REQ;
2090
2091         memset(rqst, 0, sizeof(rqst));
2092         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
2093         memset(rsp_iov, 0, sizeof(rsp_iov));
2094
2095         memset(&open_iov, 0, sizeof(open_iov));
2096         rqst[0].rq_iov = open_iov;
2097         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2098
2099         oparms.tcon = tcon;
2100         oparms.desired_access = desired_access;
2101         oparms.disposition = FILE_OPEN;
2102         if (cifs_sb && backup_cred(cifs_sb))
2103                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2104         else
2105                 oparms.create_options = 0;
2106         oparms.fid = &fid;
2107         oparms.reconnect = false;
2108
2109         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path);
2110         if (rc)
2111                 goto qic_exit;
2112         smb2_set_next_command(tcon, &rqst[0]);
2113
2114         memset(&qi_iov, 0, sizeof(qi_iov));
2115         rqst[1].rq_iov = qi_iov;
2116         rqst[1].rq_nvec = 1;
2117
2118         rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID, COMPOUND_FID,
2119                                   class, type, 0,
2120                                   output_len, 0,
2121                                   NULL);
2122         if (rc)
2123                 goto qic_exit;
2124         smb2_set_next_command(tcon, &rqst[1]);
2125         smb2_set_related(&rqst[1]);
2126
2127         memset(&close_iov, 0, sizeof(close_iov));
2128         rqst[2].rq_iov = close_iov;
2129         rqst[2].rq_nvec = 1;
2130
2131         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
2132         if (rc)
2133                 goto qic_exit;
2134         smb2_set_related(&rqst[2]);
2135
2136         rc = compound_send_recv(xid, ses, flags, 3, rqst,
2137                                 resp_buftype, rsp_iov);
2138         if (rc) {
2139                 free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2140                 goto qic_exit;
2141         }
2142         *rsp = rsp_iov[1];
2143         *buftype = resp_buftype[1];
2144
2145  qic_exit:
2146         SMB2_open_free(&rqst[0]);
2147         SMB2_query_info_free(&rqst[1]);
2148         SMB2_close_free(&rqst[2]);
2149         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2150         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
2151         return rc;
2152 }
2153
2154 static int
2155 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2156              struct kstatfs *buf)
2157 {
2158         struct smb2_query_info_rsp *rsp;
2159         struct smb2_fs_full_size_info *info = NULL;
2160         __le16 utf16_path = 0; /* Null - open root of share */
2161         struct kvec rsp_iov = {NULL, 0};
2162         int buftype = CIFS_NO_BUFFER;
2163         int rc;
2164
2165
2166         rc = smb2_query_info_compound(xid, tcon, &utf16_path,
2167                                       FILE_READ_ATTRIBUTES,
2168                                       FS_FULL_SIZE_INFORMATION,
2169                                       SMB2_O_INFO_FILESYSTEM,
2170                                       sizeof(struct smb2_fs_full_size_info),
2171                                       &rsp_iov, &buftype, NULL);
2172         if (rc)
2173                 goto qfs_exit;
2174
2175         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2176         buf->f_type = SMB2_MAGIC_NUMBER;
2177         info = (struct smb2_fs_full_size_info *)(
2178                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
2179         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
2180                                le32_to_cpu(rsp->OutputBufferLength),
2181                                &rsp_iov,
2182                                sizeof(struct smb2_fs_full_size_info));
2183         if (!rc)
2184                 smb2_copy_fs_info_to_kstatfs(info, buf);
2185
2186 qfs_exit:
2187         free_rsp_buf(buftype, rsp_iov.iov_base);
2188         return rc;
2189 }
2190
2191 static int
2192 smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2193              struct kstatfs *buf)
2194 {
2195         int rc;
2196         __le16 srch_path = 0; /* Null - open root of share */
2197         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2198         struct cifs_open_parms oparms;
2199         struct cifs_fid fid;
2200
2201         if (!tcon->posix_extensions)
2202                 return smb2_queryfs(xid, tcon, buf);
2203
2204         oparms.tcon = tcon;
2205         oparms.desired_access = FILE_READ_ATTRIBUTES;
2206         oparms.disposition = FILE_OPEN;
2207         oparms.create_options = 0;
2208         oparms.fid = &fid;
2209         oparms.reconnect = false;
2210
2211         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL, NULL);
2212         if (rc)
2213                 return rc;
2214
2215         rc = SMB311_posix_qfs_info(xid, tcon, fid.persistent_fid,
2216                                    fid.volatile_fid, buf);
2217         buf->f_type = SMB2_MAGIC_NUMBER;
2218         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2219         return rc;
2220 }
2221
2222 static bool
2223 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
2224 {
2225         return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
2226                ob1->fid.volatile_fid == ob2->fid.volatile_fid;
2227 }
2228
2229 static int
2230 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
2231                __u64 length, __u32 type, int lock, int unlock, bool wait)
2232 {
2233         if (unlock && !lock)
2234                 type = SMB2_LOCKFLAG_UNLOCK;
2235         return SMB2_lock(xid, tlink_tcon(cfile->tlink),
2236                          cfile->fid.persistent_fid, cfile->fid.volatile_fid,
2237                          current->tgid, length, offset, type, wait);
2238 }
2239
2240 static void
2241 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
2242 {
2243         memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
2244 }
2245
2246 static void
2247 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
2248 {
2249         memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
2250 }
2251
2252 static void
2253 smb2_new_lease_key(struct cifs_fid *fid)
2254 {
2255         generate_random_uuid(fid->lease_key);
2256 }
2257
2258 static int
2259 smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
2260                    const char *search_name,
2261                    struct dfs_info3_param **target_nodes,
2262                    unsigned int *num_of_nodes,
2263                    const struct nls_table *nls_codepage, int remap)
2264 {
2265         int rc;
2266         __le16 *utf16_path = NULL;
2267         int utf16_path_len = 0;
2268         struct cifs_tcon *tcon;
2269         struct fsctl_get_dfs_referral_req *dfs_req = NULL;
2270         struct get_dfs_referral_rsp *dfs_rsp = NULL;
2271         u32 dfs_req_size = 0, dfs_rsp_size = 0;
2272
2273         cifs_dbg(FYI, "smb2_get_dfs_refer path <%s>\n", search_name);
2274
2275         /*
2276          * Try to use the IPC tcon, otherwise just use any
2277          */
2278         tcon = ses->tcon_ipc;
2279         if (tcon == NULL) {
2280                 spin_lock(&cifs_tcp_ses_lock);
2281                 tcon = list_first_entry_or_null(&ses->tcon_list,
2282                                                 struct cifs_tcon,
2283                                                 tcon_list);
2284                 if (tcon)
2285                         tcon->tc_count++;
2286                 spin_unlock(&cifs_tcp_ses_lock);
2287         }
2288
2289         if (tcon == NULL) {
2290                 cifs_dbg(VFS, "session %p has no tcon available for a dfs referral request\n",
2291                          ses);
2292                 rc = -ENOTCONN;
2293                 goto out;
2294         }
2295
2296         utf16_path = cifs_strndup_to_utf16(search_name, PATH_MAX,
2297                                            &utf16_path_len,
2298                                            nls_codepage, remap);
2299         if (!utf16_path) {
2300                 rc = -ENOMEM;
2301                 goto out;
2302         }
2303
2304         dfs_req_size = sizeof(*dfs_req) + utf16_path_len;
2305         dfs_req = kzalloc(dfs_req_size, GFP_KERNEL);
2306         if (!dfs_req) {
2307                 rc = -ENOMEM;
2308                 goto out;
2309         }
2310
2311         /* Highest DFS referral version understood */
2312         dfs_req->MaxReferralLevel = DFS_VERSION;
2313
2314         /* Path to resolve in an UTF-16 null-terminated string */
2315         memcpy(dfs_req->RequestFileName, utf16_path, utf16_path_len);
2316
2317         do {
2318                 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
2319                                 FSCTL_DFS_GET_REFERRALS,
2320                                 true /* is_fsctl */,
2321                                 (char *)dfs_req, dfs_req_size, CIFSMaxBufSize,
2322                                 (char **)&dfs_rsp, &dfs_rsp_size);
2323         } while (rc == -EAGAIN);
2324
2325         if (rc) {
2326                 if ((rc != -ENOENT) && (rc != -EOPNOTSUPP))
2327                         cifs_dbg(VFS, "ioctl error in smb2_get_dfs_refer rc=%d\n", rc);
2328                 goto out;
2329         }
2330
2331         rc = parse_dfs_referrals(dfs_rsp, dfs_rsp_size,
2332                                  num_of_nodes, target_nodes,
2333                                  nls_codepage, remap, search_name,
2334                                  true /* is_unicode */);
2335         if (rc) {
2336                 cifs_dbg(VFS, "parse error in smb2_get_dfs_refer rc=%d\n", rc);
2337                 goto out;
2338         }
2339
2340  out:
2341         if (tcon && !tcon->ipc) {
2342                 /* ipc tcons are not refcounted */
2343                 spin_lock(&cifs_tcp_ses_lock);
2344                 tcon->tc_count--;
2345                 spin_unlock(&cifs_tcp_ses_lock);
2346         }
2347         kfree(utf16_path);
2348         kfree(dfs_req);
2349         kfree(dfs_rsp);
2350         return rc;
2351 }
2352 #define SMB2_SYMLINK_STRUCT_SIZE \
2353         (sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
2354
2355 static int
2356 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
2357                    const char *full_path, char **target_path,
2358                    struct cifs_sb_info *cifs_sb)
2359 {
2360         int rc;
2361         __le16 *utf16_path;
2362         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2363         struct cifs_open_parms oparms;
2364         struct cifs_fid fid;
2365         struct kvec err_iov = {NULL, 0};
2366         struct smb2_err_rsp *err_buf = NULL;
2367         int resp_buftype;
2368         struct smb2_symlink_err_rsp *symlink;
2369         unsigned int sub_len;
2370         unsigned int sub_offset;
2371         unsigned int print_len;
2372         unsigned int print_offset;
2373
2374         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
2375
2376         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2377         if (!utf16_path)
2378                 return -ENOMEM;
2379
2380         oparms.tcon = tcon;
2381         oparms.desired_access = FILE_READ_ATTRIBUTES;
2382         oparms.disposition = FILE_OPEN;
2383         if (backup_cred(cifs_sb))
2384                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2385         else
2386                 oparms.create_options = 0;
2387         oparms.fid = &fid;
2388         oparms.reconnect = false;
2389
2390         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_iov,
2391                        &resp_buftype);
2392         if (!rc || !err_iov.iov_base) {
2393                 rc = -ENOENT;
2394                 goto free_path;
2395         }
2396
2397         err_buf = err_iov.iov_base;
2398         if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
2399             err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE) {
2400                 rc = -ENOENT;
2401                 goto querty_exit;
2402         }
2403
2404         /* open must fail on symlink - reset rc */
2405         rc = 0;
2406         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
2407         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
2408         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
2409         print_len = le16_to_cpu(symlink->PrintNameLength);
2410         print_offset = le16_to_cpu(symlink->PrintNameOffset);
2411
2412         if (err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
2413                 rc = -ENOENT;
2414                 goto querty_exit;
2415         }
2416
2417         if (err_iov.iov_len <
2418             SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
2419                 rc = -ENOENT;
2420                 goto querty_exit;
2421         }
2422
2423         *target_path = cifs_strndup_from_utf16(
2424                                 (char *)symlink->PathBuffer + sub_offset,
2425                                 sub_len, true, cifs_sb->local_nls);
2426         if (!(*target_path)) {
2427                 rc = -ENOMEM;
2428                 goto querty_exit;
2429         }
2430         convert_delimiter(*target_path, '/');
2431         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2432
2433  querty_exit:
2434         free_rsp_buf(resp_buftype, err_buf);
2435  free_path:
2436         kfree(utf16_path);
2437         return rc;
2438 }
2439
2440 #ifdef CONFIG_CIFS_ACL
2441 static struct cifs_ntsd *
2442 get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
2443                 const struct cifs_fid *cifsfid, u32 *pacllen)
2444 {
2445         struct cifs_ntsd *pntsd = NULL;
2446         unsigned int xid;
2447         int rc = -EOPNOTSUPP;
2448         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2449
2450         if (IS_ERR(tlink))
2451                 return ERR_CAST(tlink);
2452
2453         xid = get_xid();
2454         cifs_dbg(FYI, "trying to get acl\n");
2455
2456         rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
2457                             cifsfid->volatile_fid, (void **)&pntsd, pacllen);
2458         free_xid(xid);
2459
2460         cifs_put_tlink(tlink);
2461
2462         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
2463         if (rc)
2464                 return ERR_PTR(rc);
2465         return pntsd;
2466
2467 }
2468
2469 static struct cifs_ntsd *
2470 get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
2471                 const char *path, u32 *pacllen)
2472 {
2473         struct cifs_ntsd *pntsd = NULL;
2474         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2475         unsigned int xid;
2476         int rc;
2477         struct cifs_tcon *tcon;
2478         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2479         struct cifs_fid fid;
2480         struct cifs_open_parms oparms;
2481         __le16 *utf16_path;
2482
2483         cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
2484         if (IS_ERR(tlink))
2485                 return ERR_CAST(tlink);
2486
2487         tcon = tlink_tcon(tlink);
2488         xid = get_xid();
2489
2490         if (backup_cred(cifs_sb))
2491                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2492         else
2493                 oparms.create_options = 0;
2494
2495         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2496         if (!utf16_path) {
2497                 rc = -ENOMEM;
2498                 free_xid(xid);
2499                 return ERR_PTR(rc);
2500         }
2501
2502         oparms.tcon = tcon;
2503         oparms.desired_access = READ_CONTROL;
2504         oparms.disposition = FILE_OPEN;
2505         oparms.fid = &fid;
2506         oparms.reconnect = false;
2507
2508         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
2509         kfree(utf16_path);
2510         if (!rc) {
2511                 rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
2512                             fid.volatile_fid, (void **)&pntsd, pacllen);
2513                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2514         }
2515
2516         cifs_put_tlink(tlink);
2517         free_xid(xid);
2518
2519         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
2520         if (rc)
2521                 return ERR_PTR(rc);
2522         return pntsd;
2523 }
2524
2525 #ifdef CONFIG_CIFS_ACL
2526 static int
2527 set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
2528                 struct inode *inode, const char *path, int aclflag)
2529 {
2530         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2531         unsigned int xid;
2532         int rc, access_flags = 0;
2533         struct cifs_tcon *tcon;
2534         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2535         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2536         struct cifs_fid fid;
2537         struct cifs_open_parms oparms;
2538         __le16 *utf16_path;
2539
2540         cifs_dbg(FYI, "set smb3 acl for path %s\n", path);
2541         if (IS_ERR(tlink))
2542                 return PTR_ERR(tlink);
2543
2544         tcon = tlink_tcon(tlink);
2545         xid = get_xid();
2546
2547         if (backup_cred(cifs_sb))
2548                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2549         else
2550                 oparms.create_options = 0;
2551
2552         if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP)
2553                 access_flags = WRITE_OWNER;
2554         else
2555                 access_flags = WRITE_DAC;
2556
2557         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2558         if (!utf16_path) {
2559                 rc = -ENOMEM;
2560                 free_xid(xid);
2561                 return rc;
2562         }
2563
2564         oparms.tcon = tcon;
2565         oparms.desired_access = access_flags;
2566         oparms.disposition = FILE_OPEN;
2567         oparms.path = path;
2568         oparms.fid = &fid;
2569         oparms.reconnect = false;
2570
2571         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
2572         kfree(utf16_path);
2573         if (!rc) {
2574                 rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
2575                             fid.volatile_fid, pnntsd, acllen, aclflag);
2576                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2577         }
2578
2579         cifs_put_tlink(tlink);
2580         free_xid(xid);
2581         return rc;
2582 }
2583 #endif /* CIFS_ACL */
2584
2585 /* Retrieve an ACL from the server */
2586 static struct cifs_ntsd *
2587 get_smb2_acl(struct cifs_sb_info *cifs_sb,
2588                                       struct inode *inode, const char *path,
2589                                       u32 *pacllen)
2590 {
2591         struct cifs_ntsd *pntsd = NULL;
2592         struct cifsFileInfo *open_file = NULL;
2593
2594         if (inode)
2595                 open_file = find_readable_file(CIFS_I(inode), true);
2596         if (!open_file)
2597                 return get_smb2_acl_by_path(cifs_sb, path, pacllen);
2598
2599         pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen);
2600         cifsFileInfo_put(open_file);
2601         return pntsd;
2602 }
2603 #endif
2604
2605 static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
2606                             loff_t offset, loff_t len, bool keep_size)
2607 {
2608         struct cifs_ses *ses = tcon->ses;
2609         struct inode *inode;
2610         struct cifsInodeInfo *cifsi;
2611         struct cifsFileInfo *cfile = file->private_data;
2612         struct file_zero_data_information fsctl_buf;
2613         struct smb_rqst rqst[2];
2614         int resp_buftype[2];
2615         struct kvec rsp_iov[2];
2616         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
2617         struct kvec si_iov[1];
2618         unsigned int size[1];
2619         void *data[1];
2620         long rc;
2621         unsigned int xid;
2622         int num = 0, flags = 0;
2623         __le64 eof;
2624
2625         xid = get_xid();
2626
2627         inode = d_inode(cfile->dentry);
2628         cifsi = CIFS_I(inode);
2629
2630         trace_smb3_zero_enter(xid, cfile->fid.persistent_fid, tcon->tid,
2631                               ses->Suid, offset, len);
2632
2633
2634         /* if file not oplocked can't be sure whether asking to extend size */
2635         if (!CIFS_CACHE_READ(cifsi))
2636                 if (keep_size == false) {
2637                         rc = -EOPNOTSUPP;
2638                         trace_smb3_zero_err(xid, cfile->fid.persistent_fid,
2639                                 tcon->tid, ses->Suid, offset, len, rc);
2640                         free_xid(xid);
2641                         return rc;
2642                 }
2643
2644         /*
2645          * Must check if file sparse since fallocate -z (zero range) assumes
2646          * non-sparse allocation
2647          */
2648         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE)) {
2649                 rc = -EOPNOTSUPP;
2650                 trace_smb3_zero_err(xid, cfile->fid.persistent_fid, tcon->tid,
2651                               ses->Suid, offset, len, rc);
2652                 free_xid(xid);
2653                 return rc;
2654         }
2655
2656         cifs_dbg(FYI, "offset %lld len %lld", offset, len);
2657
2658         fsctl_buf.FileOffset = cpu_to_le64(offset);
2659         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
2660
2661         if (smb3_encryption_required(tcon))
2662                 flags |= CIFS_TRANSFORM_REQ;
2663
2664         memset(rqst, 0, sizeof(rqst));
2665         resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
2666         memset(rsp_iov, 0, sizeof(rsp_iov));
2667
2668
2669         memset(&io_iov, 0, sizeof(io_iov));
2670         rqst[num].rq_iov = io_iov;
2671         rqst[num].rq_nvec = SMB2_IOCTL_IOV_SIZE;
2672         rc = SMB2_ioctl_init(tcon, &rqst[num++], cfile->fid.persistent_fid,
2673                              cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
2674                              true /* is_fctl */, (char *)&fsctl_buf,
2675                              sizeof(struct file_zero_data_information),
2676                              CIFSMaxBufSize);
2677         if (rc)
2678                 goto zero_range_exit;
2679
2680         /*
2681          * do we also need to change the size of the file?
2682          */
2683         if (keep_size == false && i_size_read(inode) < offset + len) {
2684                 smb2_set_next_command(tcon, &rqst[0]);
2685
2686                 memset(&si_iov, 0, sizeof(si_iov));
2687                 rqst[num].rq_iov = si_iov;
2688                 rqst[num].rq_nvec = 1;
2689
2690                 eof = cpu_to_le64(offset + len);
2691                 size[0] = 8; /* sizeof __le64 */
2692                 data[0] = &eof;
2693
2694                 rc = SMB2_set_info_init(tcon, &rqst[num++],
2695                                         cfile->fid.persistent_fid,
2696                                         cfile->fid.persistent_fid,
2697                                         current->tgid,
2698                                         FILE_END_OF_FILE_INFORMATION,
2699                                         SMB2_O_INFO_FILE, 0, data, size);
2700                 smb2_set_related(&rqst[1]);
2701         }
2702
2703         rc = compound_send_recv(xid, ses, flags, num, rqst,
2704                                 resp_buftype, rsp_iov);
2705
2706  zero_range_exit:
2707         SMB2_ioctl_free(&rqst[0]);
2708         SMB2_set_info_free(&rqst[1]);
2709         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2710         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2711         free_xid(xid);
2712         if (rc)
2713                 trace_smb3_zero_err(xid, cfile->fid.persistent_fid, tcon->tid,
2714                               ses->Suid, offset, len, rc);
2715         else
2716                 trace_smb3_zero_done(xid, cfile->fid.persistent_fid, tcon->tid,
2717                               ses->Suid, offset, len);
2718         return rc;
2719 }
2720
2721 static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
2722                             loff_t offset, loff_t len)
2723 {
2724         struct inode *inode;
2725         struct cifsInodeInfo *cifsi;
2726         struct cifsFileInfo *cfile = file->private_data;
2727         struct file_zero_data_information fsctl_buf;
2728         long rc;
2729         unsigned int xid;
2730         __u8 set_sparse = 1;
2731
2732         xid = get_xid();
2733
2734         inode = d_inode(cfile->dentry);
2735         cifsi = CIFS_I(inode);
2736
2737         /* Need to make file sparse, if not already, before freeing range. */
2738         /* Consider adding equivalent for compressed since it could also work */
2739         if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse)) {
2740                 rc = -EOPNOTSUPP;
2741                 free_xid(xid);
2742                 return rc;
2743         }
2744
2745         cifs_dbg(FYI, "offset %lld len %lld", offset, len);
2746
2747         fsctl_buf.FileOffset = cpu_to_le64(offset);
2748         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
2749
2750         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
2751                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
2752                         true /* is_fctl */, (char *)&fsctl_buf,
2753                         sizeof(struct file_zero_data_information),
2754                         CIFSMaxBufSize, NULL, NULL);
2755         free_xid(xid);
2756         return rc;
2757 }
2758
2759 static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
2760                             loff_t off, loff_t len, bool keep_size)
2761 {
2762         struct inode *inode;
2763         struct cifsInodeInfo *cifsi;
2764         struct cifsFileInfo *cfile = file->private_data;
2765         long rc = -EOPNOTSUPP;
2766         unsigned int xid;
2767         __le64 eof;
2768
2769         xid = get_xid();
2770
2771         inode = d_inode(cfile->dentry);
2772         cifsi = CIFS_I(inode);
2773
2774         trace_smb3_falloc_enter(xid, cfile->fid.persistent_fid, tcon->tid,
2775                                 tcon->ses->Suid, off, len);
2776         /* if file not oplocked can't be sure whether asking to extend size */
2777         if (!CIFS_CACHE_READ(cifsi))
2778                 if (keep_size == false) {
2779                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
2780                                 tcon->tid, tcon->ses->Suid, off, len, rc);
2781                         free_xid(xid);
2782                         return rc;
2783                 }
2784
2785         /*
2786          * Files are non-sparse by default so falloc may be a no-op
2787          * Must check if file sparse. If not sparse, and not extending
2788          * then no need to do anything since file already allocated
2789          */
2790         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
2791                 if (keep_size == true)
2792                         rc = 0;
2793                 /* check if extending file */
2794                 else if (i_size_read(inode) >= off + len)
2795                         /* not extending file and already not sparse */
2796                         rc = 0;
2797                 /* BB: in future add else clause to extend file */
2798                 else
2799                         rc = -EOPNOTSUPP;
2800                 if (rc)
2801                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
2802                                 tcon->tid, tcon->ses->Suid, off, len, rc);
2803                 else
2804                         trace_smb3_falloc_done(xid, cfile->fid.persistent_fid,
2805                                 tcon->tid, tcon->ses->Suid, off, len);
2806                 free_xid(xid);
2807                 return rc;
2808         }
2809
2810         if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
2811                 /*
2812                  * Check if falloc starts within first few pages of file
2813                  * and ends within a few pages of the end of file to
2814                  * ensure that most of file is being forced to be
2815                  * fallocated now. If so then setting whole file sparse
2816                  * ie potentially making a few extra pages at the beginning
2817                  * or end of the file non-sparse via set_sparse is harmless.
2818                  */
2819                 if ((off > 8192) || (off + len + 8192 < i_size_read(inode))) {
2820                         rc = -EOPNOTSUPP;
2821                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
2822                                 tcon->tid, tcon->ses->Suid, off, len, rc);
2823                         free_xid(xid);
2824                         return rc;
2825                 }
2826
2827                 smb2_set_sparse(xid, tcon, cfile, inode, false);
2828                 rc = 0;
2829         } else {
2830                 smb2_set_sparse(xid, tcon, cfile, inode, false);
2831                 rc = 0;
2832                 if (i_size_read(inode) < off + len) {
2833                         eof = cpu_to_le64(off + len);
2834                         rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
2835                                           cfile->fid.volatile_fid, cfile->pid,
2836                                           &eof);
2837                 }
2838         }
2839
2840         if (rc)
2841                 trace_smb3_falloc_err(xid, cfile->fid.persistent_fid, tcon->tid,
2842                                 tcon->ses->Suid, off, len, rc);
2843         else
2844                 trace_smb3_falloc_done(xid, cfile->fid.persistent_fid, tcon->tid,
2845                                 tcon->ses->Suid, off, len);
2846
2847         free_xid(xid);
2848         return rc;
2849 }
2850
2851
2852 static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
2853                            loff_t off, loff_t len)
2854 {
2855         /* KEEP_SIZE already checked for by do_fallocate */
2856         if (mode & FALLOC_FL_PUNCH_HOLE)
2857                 return smb3_punch_hole(file, tcon, off, len);
2858         else if (mode & FALLOC_FL_ZERO_RANGE) {
2859                 if (mode & FALLOC_FL_KEEP_SIZE)
2860                         return smb3_zero_range(file, tcon, off, len, true);
2861                 return smb3_zero_range(file, tcon, off, len, false);
2862         } else if (mode == FALLOC_FL_KEEP_SIZE)
2863                 return smb3_simple_falloc(file, tcon, off, len, true);
2864         else if (mode == 0)
2865                 return smb3_simple_falloc(file, tcon, off, len, false);
2866
2867         return -EOPNOTSUPP;
2868 }
2869
2870 static void
2871 smb2_downgrade_oplock(struct TCP_Server_Info *server,
2872                         struct cifsInodeInfo *cinode, bool set_level2)
2873 {
2874         if (set_level2)
2875                 server->ops->set_oplock_level(cinode, SMB2_OPLOCK_LEVEL_II,
2876                                                 0, NULL);
2877         else
2878                 server->ops->set_oplock_level(cinode, 0, 0, NULL);
2879 }
2880
2881 static void
2882 smb21_downgrade_oplock(struct TCP_Server_Info *server,
2883                        struct cifsInodeInfo *cinode, bool set_level2)
2884 {
2885         server->ops->set_oplock_level(cinode,
2886                                       set_level2 ? SMB2_LEASE_READ_CACHING_HE :
2887                                       0, 0, NULL);
2888 }
2889
2890 static void
2891 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
2892                       unsigned int epoch, bool *purge_cache)
2893 {
2894         oplock &= 0xFF;
2895         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
2896                 return;
2897         if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2898                 cinode->oplock = CIFS_CACHE_RHW_FLG;
2899                 cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
2900                          &cinode->vfs_inode);
2901         } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
2902                 cinode->oplock = CIFS_CACHE_RW_FLG;
2903                 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
2904                          &cinode->vfs_inode);
2905         } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
2906                 cinode->oplock = CIFS_CACHE_READ_FLG;
2907                 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
2908                          &cinode->vfs_inode);
2909         } else
2910                 cinode->oplock = 0;
2911 }
2912
2913 static void
2914 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
2915                        unsigned int epoch, bool *purge_cache)
2916 {
2917         char message[5] = {0};
2918
2919         oplock &= 0xFF;
2920         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
2921                 return;
2922
2923         cinode->oplock = 0;
2924         if (oplock & SMB2_LEASE_READ_CACHING_HE) {
2925                 cinode->oplock |= CIFS_CACHE_READ_FLG;
2926                 strcat(message, "R");
2927         }
2928         if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
2929                 cinode->oplock |= CIFS_CACHE_HANDLE_FLG;
2930                 strcat(message, "H");
2931         }
2932         if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
2933                 cinode->oplock |= CIFS_CACHE_WRITE_FLG;
2934                 strcat(message, "W");
2935         }
2936         if (!cinode->oplock)
2937                 strcat(message, "None");
2938         cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
2939                  &cinode->vfs_inode);
2940 }
2941
2942 static void
2943 smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
2944                       unsigned int epoch, bool *purge_cache)
2945 {
2946         unsigned int old_oplock = cinode->oplock;
2947
2948         smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
2949
2950         if (purge_cache) {
2951                 *purge_cache = false;
2952                 if (old_oplock == CIFS_CACHE_READ_FLG) {
2953                         if (cinode->oplock == CIFS_CACHE_READ_FLG &&
2954                             (epoch - cinode->epoch > 0))
2955                                 *purge_cache = true;
2956                         else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
2957                                  (epoch - cinode->epoch > 1))
2958                                 *purge_cache = true;
2959                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
2960                                  (epoch - cinode->epoch > 1))
2961                                 *purge_cache = true;
2962                         else if (cinode->oplock == 0 &&
2963                                  (epoch - cinode->epoch > 0))
2964                                 *purge_cache = true;
2965                 } else if (old_oplock == CIFS_CACHE_RH_FLG) {
2966                         if (cinode->oplock == CIFS_CACHE_RH_FLG &&
2967                             (epoch - cinode->epoch > 0))
2968                                 *purge_cache = true;
2969                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
2970                                  (epoch - cinode->epoch > 1))
2971                                 *purge_cache = true;
2972                 }
2973                 cinode->epoch = epoch;
2974         }
2975 }
2976
2977 static bool
2978 smb2_is_read_op(__u32 oplock)
2979 {
2980         return oplock == SMB2_OPLOCK_LEVEL_II;
2981 }
2982
2983 static bool
2984 smb21_is_read_op(__u32 oplock)
2985 {
2986         return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
2987                !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
2988 }
2989
2990 static __le32
2991 map_oplock_to_lease(u8 oplock)
2992 {
2993         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
2994                 return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
2995         else if (oplock == SMB2_OPLOCK_LEVEL_II)
2996                 return SMB2_LEASE_READ_CACHING;
2997         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
2998                 return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
2999                        SMB2_LEASE_WRITE_CACHING;
3000         return 0;
3001 }
3002
3003 static char *
3004 smb2_create_lease_buf(u8 *lease_key, u8 oplock)
3005 {
3006         struct create_lease *buf;
3007
3008         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
3009         if (!buf)
3010                 return NULL;
3011
3012         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
3013         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
3014
3015         buf->ccontext.DataOffset = cpu_to_le16(offsetof
3016                                         (struct create_lease, lcontext));
3017         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
3018         buf->ccontext.NameOffset = cpu_to_le16(offsetof
3019                                 (struct create_lease, Name));
3020         buf->ccontext.NameLength = cpu_to_le16(4);
3021         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
3022         buf->Name[0] = 'R';
3023         buf->Name[1] = 'q';
3024         buf->Name[2] = 'L';
3025         buf->Name[3] = 's';
3026         return (char *)buf;
3027 }
3028
3029 static char *
3030 smb3_create_lease_buf(u8 *lease_key, u8 oplock)
3031 {
3032         struct create_lease_v2 *buf;
3033
3034         buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
3035         if (!buf)
3036                 return NULL;
3037
3038         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
3039         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
3040
3041         buf->ccontext.DataOffset = cpu_to_le16(offsetof
3042                                         (struct create_lease_v2, lcontext));
3043         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
3044         buf->ccontext.NameOffset = cpu_to_le16(offsetof
3045                                 (struct create_lease_v2, Name));
3046         buf->ccontext.NameLength = cpu_to_le16(4);
3047         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
3048         buf->Name[0] = 'R';
3049         buf->Name[1] = 'q';
3050         buf->Name[2] = 'L';
3051         buf->Name[3] = 's';
3052         return (char *)buf;
3053 }
3054
3055 static __u8
3056 smb2_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
3057 {
3058         struct create_lease *lc = (struct create_lease *)buf;
3059
3060         *epoch = 0; /* not used */
3061         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
3062                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
3063         return le32_to_cpu(lc->lcontext.LeaseState);
3064 }
3065
3066 static __u8
3067 smb3_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
3068 {
3069         struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
3070
3071         *epoch = le16_to_cpu(lc->lcontext.Epoch);
3072         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
3073                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
3074         if (lease_key)
3075                 memcpy(lease_key, &lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
3076         return le32_to_cpu(lc->lcontext.LeaseState);
3077 }
3078
3079 static unsigned int
3080 smb2_wp_retry_size(struct inode *inode)
3081 {
3082         return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
3083                      SMB2_MAX_BUFFER_SIZE);
3084 }
3085
3086 static bool
3087 smb2_dir_needs_close(struct cifsFileInfo *cfile)
3088 {
3089         return !cfile->invalidHandle;
3090 }
3091
3092 static void
3093 fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, unsigned int orig_len,
3094                    struct smb_rqst *old_rq)
3095 {
3096         struct smb2_sync_hdr *shdr =
3097                         (struct smb2_sync_hdr *)old_rq->rq_iov[0].iov_base;
3098
3099         memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
3100         tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
3101         tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
3102         tr_hdr->Flags = cpu_to_le16(0x01);
3103         get_random_bytes(&tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
3104         memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
3105 }
3106
3107 /* We can not use the normal sg_set_buf() as we will sometimes pass a
3108  * stack object as buf.
3109  */
3110 static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf,
3111                                    unsigned int buflen)
3112 {
3113         sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
3114 }
3115
3116 /* Assumes the first rqst has a transform header as the first iov.
3117  * I.e.
3118  * rqst[0].rq_iov[0]  is transform header
3119  * rqst[0].rq_iov[1+] data to be encrypted/decrypted
3120  * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
3121  */
3122 static struct scatterlist *
3123 init_sg(int num_rqst, struct smb_rqst *rqst, u8 *sign)
3124 {
3125         unsigned int sg_len;
3126         struct scatterlist *sg;
3127         unsigned int i;
3128         unsigned int j;
3129         unsigned int idx = 0;
3130         int skip;
3131
3132         sg_len = 1;
3133         for (i = 0; i < num_rqst; i++)
3134                 sg_len += rqst[i].rq_nvec + rqst[i].rq_npages;
3135
3136         sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
3137         if (!sg)
3138                 return NULL;
3139
3140         sg_init_table(sg, sg_len);
3141         for (i = 0; i < num_rqst; i++) {
3142                 for (j = 0; j < rqst[i].rq_nvec; j++) {
3143                         /*
3144                          * The first rqst has a transform header where the
3145                          * first 20 bytes are not part of the encrypted blob
3146                          */
3147                         skip = (i == 0) && (j == 0) ? 20 : 0;
3148                         smb2_sg_set_buf(&sg[idx++],
3149                                         rqst[i].rq_iov[j].iov_base + skip,
3150                                         rqst[i].rq_iov[j].iov_len - skip);
3151                         }
3152
3153                 for (j = 0; j < rqst[i].rq_npages; j++) {
3154                         unsigned int len, offset;
3155
3156                         rqst_page_get_length(&rqst[i], j, &len, &offset);
3157                         sg_set_page(&sg[idx++], rqst[i].rq_pages[j], len, offset);
3158                 }
3159         }
3160         smb2_sg_set_buf(&sg[idx], sign, SMB2_SIGNATURE_SIZE);
3161         return sg;
3162 }
3163
3164 static int
3165 smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
3166 {
3167         struct cifs_ses *ses;
3168         u8 *ses_enc_key;
3169
3170         spin_lock(&cifs_tcp_ses_lock);
3171         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3172                 if (ses->Suid != ses_id)
3173                         continue;
3174                 ses_enc_key = enc ? ses->smb3encryptionkey :
3175                                                         ses->smb3decryptionkey;
3176                 memcpy(key, ses_enc_key, SMB3_SIGN_KEY_SIZE);
3177                 spin_unlock(&cifs_tcp_ses_lock);
3178                 return 0;
3179         }
3180         spin_unlock(&cifs_tcp_ses_lock);
3181
3182         return 1;
3183 }
3184 /*
3185  * Encrypt or decrypt @rqst message. @rqst[0] has the following format:
3186  * iov[0]   - transform header (associate data),
3187  * iov[1-N] - SMB2 header and pages - data to encrypt.
3188  * On success return encrypted data in iov[1-N] and pages, leave iov[0]
3189  * untouched.
3190  */
3191 static int
3192 crypt_message(struct TCP_Server_Info *server, int num_rqst,
3193               struct smb_rqst *rqst, int enc)
3194 {
3195         struct smb2_transform_hdr *tr_hdr =
3196                 (struct smb2_transform_hdr *)rqst[0].rq_iov[0].iov_base;
3197         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
3198         int rc = 0;
3199         struct scatterlist *sg;
3200         u8 sign[SMB2_SIGNATURE_SIZE] = {};
3201         u8 key[SMB3_SIGN_KEY_SIZE];
3202         struct aead_request *req;
3203         char *iv;
3204         unsigned int iv_len;
3205         DECLARE_CRYPTO_WAIT(wait);
3206         struct crypto_aead *tfm;
3207         unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
3208
3209         rc = smb2_get_enc_key(server, tr_hdr->SessionId, enc, key);
3210         if (rc) {
3211                 cifs_dbg(VFS, "%s: Could not get %scryption key\n", __func__,
3212                          enc ? "en" : "de");
3213                 return 0;
3214         }
3215
3216         rc = smb3_crypto_aead_allocate(server);
3217         if (rc) {
3218                 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
3219                 return rc;
3220         }
3221
3222         tfm = enc ? server->secmech.ccmaesencrypt :
3223                                                 server->secmech.ccmaesdecrypt;
3224         rc = crypto_aead_setkey(tfm, key, SMB3_SIGN_KEY_SIZE);
3225         if (rc) {
3226                 cifs_dbg(VFS, "%s: Failed to set aead key %d\n", __func__, rc);
3227                 return rc;
3228         }
3229
3230         rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
3231         if (rc) {
3232                 cifs_dbg(VFS, "%s: Failed to set authsize %d\n", __func__, rc);
3233                 return rc;
3234         }
3235
3236         req = aead_request_alloc(tfm, GFP_KERNEL);
3237         if (!req) {
3238                 cifs_dbg(VFS, "%s: Failed to alloc aead request", __func__);
3239                 return -ENOMEM;
3240         }
3241
3242         if (!enc) {
3243                 memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
3244                 crypt_len += SMB2_SIGNATURE_SIZE;
3245         }
3246
3247         sg = init_sg(num_rqst, rqst, sign);
3248         if (!sg) {
3249                 cifs_dbg(VFS, "%s: Failed to init sg", __func__);
3250                 rc = -ENOMEM;
3251                 goto free_req;
3252         }
3253
3254         iv_len = crypto_aead_ivsize(tfm);
3255         iv = kzalloc(iv_len, GFP_KERNEL);
3256         if (!iv) {
3257                 cifs_dbg(VFS, "%s: Failed to alloc IV", __func__);
3258                 rc = -ENOMEM;
3259                 goto free_sg;
3260         }
3261         iv[0] = 3;
3262         memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
3263
3264         aead_request_set_crypt(req, sg, sg, crypt_len, iv);
3265         aead_request_set_ad(req, assoc_data_len);
3266
3267         aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
3268                                   crypto_req_done, &wait);
3269
3270         rc = crypto_wait_req(enc ? crypto_aead_encrypt(req)
3271                                 : crypto_aead_decrypt(req), &wait);
3272
3273         if (!rc && enc)
3274                 memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
3275
3276         kfree(iv);
3277 free_sg:
3278         kfree(sg);
3279 free_req:
3280         kfree(req);
3281         return rc;
3282 }
3283
3284 void
3285 smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst)
3286 {
3287         int i, j;
3288
3289         for (i = 0; i < num_rqst; i++) {
3290                 if (rqst[i].rq_pages) {
3291                         for (j = rqst[i].rq_npages - 1; j >= 0; j--)
3292                                 put_page(rqst[i].rq_pages[j]);
3293                         kfree(rqst[i].rq_pages);
3294                 }
3295         }
3296 }
3297
3298 /*
3299  * This function will initialize new_rq and encrypt the content.
3300  * The first entry, new_rq[0], only contains a single iov which contains
3301  * a smb2_transform_hdr and is pre-allocated by the caller.
3302  * This function then populates new_rq[1+] with the content from olq_rq[0+].
3303  *
3304  * The end result is an array of smb_rqst structures where the first structure
3305  * only contains a single iov for the transform header which we then can pass
3306  * to crypt_message().
3307  *
3308  * new_rq[0].rq_iov[0] :  smb2_transform_hdr pre-allocated by the caller
3309  * new_rq[1+].rq_iov[*] == old_rq[0+].rq_iov[*] : SMB2/3 requests
3310  */
3311 static int
3312 smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
3313                        struct smb_rqst *new_rq, struct smb_rqst *old_rq)
3314 {
3315         struct page **pages;
3316         struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
3317         unsigned int npages;
3318         unsigned int orig_len = 0;
3319         int i, j;
3320         int rc = -ENOMEM;
3321
3322         for (i = 1; i < num_rqst; i++) {
3323                 npages = old_rq[i - 1].rq_npages;
3324                 pages = kmalloc_array(npages, sizeof(struct page *),
3325                                       GFP_KERNEL);
3326                 if (!pages)
3327                         goto err_free;
3328
3329                 new_rq[i].rq_pages = pages;
3330                 new_rq[i].rq_npages = npages;
3331                 new_rq[i].rq_offset = old_rq[i - 1].rq_offset;
3332                 new_rq[i].rq_pagesz = old_rq[i - 1].rq_pagesz;
3333                 new_rq[i].rq_tailsz = old_rq[i - 1].rq_tailsz;
3334                 new_rq[i].rq_iov = old_rq[i - 1].rq_iov;
3335                 new_rq[i].rq_nvec = old_rq[i - 1].rq_nvec;
3336
3337                 orig_len += smb_rqst_len(server, &old_rq[i - 1]);
3338
3339                 for (j = 0; j < npages; j++) {
3340                         pages[j] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
3341                         if (!pages[j])
3342                                 goto err_free;
3343                 }
3344
3345                 /* copy pages form the old */
3346                 for (j = 0; j < npages; j++) {
3347                         char *dst, *src;
3348                         unsigned int offset, len;
3349
3350                         rqst_page_get_length(&new_rq[i], j, &len, &offset);
3351
3352                         dst = (char *) kmap(new_rq[i].rq_pages[j]) + offset;
3353                         src = (char *) kmap(old_rq[i - 1].rq_pages[j]) + offset;
3354
3355                         memcpy(dst, src, len);
3356                         kunmap(new_rq[i].rq_pages[j]);
3357                         kunmap(old_rq[i - 1].rq_pages[j]);
3358                 }
3359         }
3360
3361         /* fill the 1st iov with a transform header */
3362         fill_transform_hdr(tr_hdr, orig_len, old_rq);
3363
3364         rc = crypt_message(server, num_rqst, new_rq, 1);
3365         cifs_dbg(FYI, "encrypt message returned %d", rc);
3366         if (rc)
3367                 goto err_free;
3368
3369         return rc;
3370
3371 err_free:
3372         smb3_free_compound_rqst(num_rqst - 1, &new_rq[1]);
3373         return rc;
3374 }
3375
3376 static int
3377 smb3_is_transform_hdr(void *buf)
3378 {
3379         struct smb2_transform_hdr *trhdr = buf;
3380
3381         return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
3382 }
3383
3384 static int
3385 decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
3386                  unsigned int buf_data_size, struct page **pages,
3387                  unsigned int npages, unsigned int page_data_size)
3388 {
3389         struct kvec iov[2];
3390         struct smb_rqst rqst = {NULL};
3391         int rc;
3392
3393         iov[0].iov_base = buf;
3394         iov[0].iov_len = sizeof(struct smb2_transform_hdr);
3395         iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
3396         iov[1].iov_len = buf_data_size;
3397
3398         rqst.rq_iov = iov;
3399         rqst.rq_nvec = 2;
3400         rqst.rq_pages = pages;
3401         rqst.rq_npages = npages;
3402         rqst.rq_pagesz = PAGE_SIZE;
3403         rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
3404
3405         rc = crypt_message(server, 1, &rqst, 0);
3406         cifs_dbg(FYI, "decrypt message returned %d\n", rc);
3407
3408         if (rc)
3409                 return rc;
3410
3411         memmove(buf, iov[1].iov_base, buf_data_size);
3412
3413         server->total_read = buf_data_size + page_data_size;
3414
3415         return rc;
3416 }
3417
3418 static int
3419 read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
3420                      unsigned int npages, unsigned int len)
3421 {
3422         int i;
3423         int length;
3424
3425         for (i = 0; i < npages; i++) {
3426                 struct page *page = pages[i];
3427                 size_t n;
3428
3429                 n = len;
3430                 if (len >= PAGE_SIZE) {
3431                         /* enough data to fill the page */
3432                         n = PAGE_SIZE;
3433                         len -= n;
3434                 } else {
3435                         zero_user(page, len, PAGE_SIZE - len);
3436                         len = 0;
3437                 }
3438                 length = cifs_read_page_from_socket(server, page, 0, n);
3439                 if (length < 0)
3440                         return length;
3441                 server->total_read += length;
3442         }
3443
3444         return 0;
3445 }
3446
3447 static int
3448 init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
3449                unsigned int cur_off, struct bio_vec **page_vec)
3450 {
3451         struct bio_vec *bvec;
3452         int i;
3453
3454         bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
3455         if (!bvec)
3456                 return -ENOMEM;
3457
3458         for (i = 0; i < npages; i++) {
3459                 bvec[i].bv_page = pages[i];
3460                 bvec[i].bv_offset = (i == 0) ? cur_off : 0;
3461                 bvec[i].bv_len = min_t(unsigned int, PAGE_SIZE, data_size);
3462                 data_size -= bvec[i].bv_len;
3463         }
3464
3465         if (data_size != 0) {
3466                 cifs_dbg(VFS, "%s: something went wrong\n", __func__);
3467                 kfree(bvec);
3468                 return -EIO;
3469         }
3470
3471         *page_vec = bvec;
3472         return 0;
3473 }
3474
3475 static int
3476 handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
3477                  char *buf, unsigned int buf_len, struct page **pages,
3478                  unsigned int npages, unsigned int page_data_size)
3479 {
3480         unsigned int data_offset;
3481         unsigned int data_len;
3482         unsigned int cur_off;
3483         unsigned int cur_page_idx;
3484         unsigned int pad_len;
3485         struct cifs_readdata *rdata = mid->callback_data;
3486         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
3487         struct bio_vec *bvec = NULL;
3488         struct iov_iter iter;
3489         struct kvec iov;
3490         int length;
3491         bool use_rdma_mr = false;
3492
3493         if (shdr->Command != SMB2_READ) {
3494                 cifs_dbg(VFS, "only big read responses are supported\n");
3495                 return -ENOTSUPP;
3496         }
3497
3498         if (server->ops->is_session_expired &&
3499             server->ops->is_session_expired(buf)) {
3500                 cifs_reconnect(server);
3501                 wake_up(&server->response_q);
3502                 return -1;
3503         }
3504
3505         if (server->ops->is_status_pending &&
3506                         server->ops->is_status_pending(buf, server))
3507                 return -1;
3508
3509         /* set up first two iov to get credits */
3510         rdata->iov[0].iov_base = buf;
3511         rdata->iov[0].iov_len = 0;
3512         rdata->iov[1].iov_base = buf;
3513         rdata->iov[1].iov_len =
3514                 min_t(unsigned int, buf_len, server->vals->read_rsp_size);
3515         cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
3516                  rdata->iov[0].iov_base, rdata->iov[0].iov_len);
3517         cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
3518                  rdata->iov[1].iov_base, rdata->iov[1].iov_len);
3519
3520         rdata->result = server->ops->map_error(buf, true);
3521         if (rdata->result != 0) {
3522                 cifs_dbg(FYI, "%s: server returned error %d\n",
3523                          __func__, rdata->result);
3524                 /* normal error on read response */
3525                 dequeue_mid(mid, false);
3526                 return 0;
3527         }
3528
3529         data_offset = server->ops->read_data_offset(buf);
3530 #ifdef CONFIG_CIFS_SMB_DIRECT
3531         use_rdma_mr = rdata->mr;
3532 #endif
3533         data_len = server->ops->read_data_length(buf, use_rdma_mr);
3534
3535         if (data_offset < server->vals->read_rsp_size) {
3536                 /*
3537                  * win2k8 sometimes sends an offset of 0 when the read
3538                  * is beyond the EOF. Treat it as if the data starts just after
3539                  * the header.
3540                  */
3541                 cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
3542                          __func__, data_offset);
3543                 data_offset = server->vals->read_rsp_size;
3544         } else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
3545                 /* data_offset is beyond the end of smallbuf */
3546                 cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
3547                          __func__, data_offset);
3548                 rdata->result = -EIO;
3549                 dequeue_mid(mid, rdata->result);
3550                 return 0;
3551         }
3552
3553         pad_len = data_offset - server->vals->read_rsp_size;
3554
3555         if (buf_len <= data_offset) {
3556                 /* read response payload is in pages */
3557                 cur_page_idx = pad_len / PAGE_SIZE;
3558                 cur_off = pad_len % PAGE_SIZE;
3559
3560                 if (cur_page_idx != 0) {
3561                         /* data offset is beyond the 1st page of response */
3562                         cifs_dbg(FYI, "%s: data offset (%u) beyond 1st page of response\n",
3563                                  __func__, data_offset);
3564                         rdata->result = -EIO;
3565                         dequeue_mid(mid, rdata->result);
3566                         return 0;
3567                 }
3568
3569                 if (data_len > page_data_size - pad_len) {
3570                         /* data_len is corrupt -- discard frame */
3571                         rdata->result = -EIO;
3572                         dequeue_mid(mid, rdata->result);
3573                         return 0;
3574                 }
3575
3576                 rdata->result = init_read_bvec(pages, npages, page_data_size,
3577                                                cur_off, &bvec);
3578                 if (rdata->result != 0) {
3579                         dequeue_mid(mid, rdata->result);
3580                         return 0;
3581                 }
3582
3583                 iov_iter_bvec(&iter, WRITE, bvec, npages, data_len);
3584         } else if (buf_len >= data_offset + data_len) {
3585                 /* read response payload is in buf */
3586                 WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
3587                 iov.iov_base = buf + data_offset;
3588                 iov.iov_len = data_len;
3589                 iov_iter_kvec(&iter, WRITE, &iov, 1, data_len);
3590         } else {
3591                 /* read response payload cannot be in both buf and pages */
3592                 WARN_ONCE(1, "buf can not contain only a part of read data");
3593                 rdata->result = -EIO;
3594                 dequeue_mid(mid, rdata->result);
3595                 return 0;
3596         }
3597
3598         length = rdata->copy_into_pages(server, rdata, &iter);
3599
3600         kfree(bvec);
3601
3602         if (length < 0)
3603                 return length;
3604
3605         dequeue_mid(mid, false);
3606         return length;
3607 }
3608
3609 static int
3610 receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid)
3611 {
3612         char *buf = server->smallbuf;
3613         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
3614         unsigned int npages;
3615         struct page **pages;
3616         unsigned int len;
3617         unsigned int buflen = server->pdu_size;
3618         int rc;
3619         int i = 0;
3620
3621         len = min_t(unsigned int, buflen, server->vals->read_rsp_size +
3622                 sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
3623
3624         rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
3625         if (rc < 0)
3626                 return rc;
3627         server->total_read += rc;
3628
3629         len = le32_to_cpu(tr_hdr->OriginalMessageSize) -
3630                 server->vals->read_rsp_size;
3631         npages = DIV_ROUND_UP(len, PAGE_SIZE);
3632
3633         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
3634         if (!pages) {
3635                 rc = -ENOMEM;
3636                 goto discard_data;
3637         }
3638
3639         for (; i < npages; i++) {
3640                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
3641                 if (!pages[i]) {
3642                         rc = -ENOMEM;
3643                         goto discard_data;
3644                 }
3645         }
3646
3647         /* read read data into pages */
3648         rc = read_data_into_pages(server, pages, npages, len);
3649         if (rc)
3650                 goto free_pages;
3651
3652         rc = cifs_discard_remaining_data(server);
3653         if (rc)
3654                 goto free_pages;
3655
3656         rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size,
3657                               pages, npages, len);
3658         if (rc)
3659                 goto free_pages;
3660
3661         *mid = smb2_find_mid(server, buf);
3662         if (*mid == NULL)
3663                 cifs_dbg(FYI, "mid not found\n");
3664         else {
3665                 cifs_dbg(FYI, "mid found\n");
3666                 (*mid)->decrypted = true;
3667                 rc = handle_read_data(server, *mid, buf,
3668                                       server->vals->read_rsp_size,
3669                                       pages, npages, len);
3670         }
3671
3672 free_pages:
3673         for (i = i - 1; i >= 0; i--)
3674                 put_page(pages[i]);
3675         kfree(pages);
3676         return rc;
3677 discard_data:
3678         cifs_discard_remaining_data(server);
3679         goto free_pages;
3680 }
3681
3682 static int
3683 receive_encrypted_standard(struct TCP_Server_Info *server,
3684                            struct mid_q_entry **mids, char **bufs,
3685                            int *num_mids)
3686 {
3687         int ret, length;
3688         char *buf = server->smallbuf;
3689         char *tmpbuf;
3690         struct smb2_sync_hdr *shdr;
3691         unsigned int pdu_length = server->pdu_size;
3692         unsigned int buf_size;
3693         struct mid_q_entry *mid_entry;
3694         int next_is_large;
3695         char *next_buffer = NULL;
3696
3697         *num_mids = 0;
3698
3699         /* switch to large buffer if too big for a small one */
3700         if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE) {
3701                 server->large_buf = true;
3702                 memcpy(server->bigbuf, buf, server->total_read);
3703                 buf = server->bigbuf;
3704         }
3705
3706         /* now read the rest */
3707         length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
3708                                 pdu_length - HEADER_SIZE(server) + 1);
3709         if (length < 0)
3710                 return length;
3711         server->total_read += length;
3712
3713         buf_size = pdu_length - sizeof(struct smb2_transform_hdr);
3714         length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0);
3715         if (length)
3716                 return length;
3717
3718         next_is_large = server->large_buf;
3719  one_more:
3720         shdr = (struct smb2_sync_hdr *)buf;
3721         if (shdr->NextCommand) {
3722                 if (next_is_large) {
3723                         tmpbuf = server->bigbuf;
3724                         next_buffer = (char *)cifs_buf_get();
3725                 } else {
3726                         tmpbuf = server->smallbuf;
3727                         next_buffer = (char *)cifs_small_buf_get();
3728                 }
3729                 memcpy(next_buffer,
3730                        tmpbuf + le32_to_cpu(shdr->NextCommand),
3731                        pdu_length - le32_to_cpu(shdr->NextCommand));
3732         }
3733
3734         mid_entry = smb2_find_mid(server, buf);
3735         if (mid_entry == NULL)
3736                 cifs_dbg(FYI, "mid not found\n");
3737         else {
3738                 cifs_dbg(FYI, "mid found\n");
3739                 mid_entry->decrypted = true;
3740                 mid_entry->resp_buf_size = server->pdu_size;
3741         }
3742
3743         if (*num_mids >= MAX_COMPOUND) {
3744                 cifs_dbg(VFS, "too many PDUs in compound\n");
3745                 return -1;
3746         }
3747         bufs[*num_mids] = buf;
3748         mids[(*num_mids)++] = mid_entry;
3749
3750         if (mid_entry && mid_entry->handle)
3751                 ret = mid_entry->handle(server, mid_entry);
3752         else
3753                 ret = cifs_handle_standard(server, mid_entry);
3754
3755         if (ret == 0 && shdr->NextCommand) {
3756                 pdu_length -= le32_to_cpu(shdr->NextCommand);
3757                 server->large_buf = next_is_large;
3758                 if (next_is_large)
3759                         server->bigbuf = next_buffer;
3760                 else
3761                         server->smallbuf = next_buffer;
3762
3763                 buf += le32_to_cpu(shdr->NextCommand);
3764                 goto one_more;
3765         }
3766
3767         return ret;
3768 }
3769
3770 static int
3771 smb3_receive_transform(struct TCP_Server_Info *server,
3772                        struct mid_q_entry **mids, char **bufs, int *num_mids)
3773 {
3774         char *buf = server->smallbuf;
3775         unsigned int pdu_length = server->pdu_size;
3776         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
3777         unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
3778
3779         if (pdu_length < sizeof(struct smb2_transform_hdr) +
3780                                                 sizeof(struct smb2_sync_hdr)) {
3781                 cifs_dbg(VFS, "Transform message is too small (%u)\n",
3782                          pdu_length);
3783                 cifs_reconnect(server);
3784                 wake_up(&server->response_q);
3785                 return -ECONNABORTED;
3786         }
3787
3788         if (pdu_length < orig_len + sizeof(struct smb2_transform_hdr)) {
3789                 cifs_dbg(VFS, "Transform message is broken\n");
3790                 cifs_reconnect(server);
3791                 wake_up(&server->response_q);
3792                 return -ECONNABORTED;
3793         }
3794
3795         /* TODO: add support for compounds containing READ. */
3796         if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server)) {
3797                 *num_mids = 1;
3798                 return receive_encrypted_read(server, &mids[0]);
3799         }
3800
3801         return receive_encrypted_standard(server, mids, bufs, num_mids);
3802 }
3803
3804 int
3805 smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
3806 {
3807         char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
3808
3809         return handle_read_data(server, mid, buf, server->pdu_size,
3810                                 NULL, 0, 0);
3811 }
3812
3813 static int
3814 smb2_next_header(char *buf)
3815 {
3816         struct smb2_sync_hdr *hdr = (struct smb2_sync_hdr *)buf;
3817         struct smb2_transform_hdr *t_hdr = (struct smb2_transform_hdr *)buf;
3818
3819         if (hdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM)
3820                 return sizeof(struct smb2_transform_hdr) +
3821                   le32_to_cpu(t_hdr->OriginalMessageSize);
3822
3823         return le32_to_cpu(hdr->NextCommand);
3824 }
3825
3826 static int
3827 smb2_make_node(unsigned int xid, struct inode *inode,
3828                struct dentry *dentry, struct cifs_tcon *tcon,
3829                char *full_path, umode_t mode, dev_t dev)
3830 {
3831         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
3832         int rc = -EPERM;
3833         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
3834         FILE_ALL_INFO *buf = NULL;
3835         struct cifs_io_parms io_parms;
3836         __u32 oplock = 0;
3837         struct cifs_fid fid;
3838         struct cifs_open_parms oparms;
3839         unsigned int bytes_written;
3840         struct win_dev *pdev;
3841         struct kvec iov[2];
3842
3843         /*
3844          * Check if mounted with mount parm 'sfu' mount parm.
3845          * SFU emulation should work with all servers, but only
3846          * supports block and char device (no socket & fifo),
3847          * and was used by default in earlier versions of Windows
3848          */
3849         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
3850                 goto out;
3851
3852         /*
3853          * TODO: Add ability to create instead via reparse point. Windows (e.g.
3854          * their current NFS server) uses this approach to expose special files
3855          * over SMB2/SMB3 and Samba will do this with SMB3.1.1 POSIX Extensions
3856          */
3857
3858         if (!S_ISCHR(mode) && !S_ISBLK(mode))
3859                 goto out;
3860
3861         cifs_dbg(FYI, "sfu compat create special file\n");
3862
3863         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
3864         if (buf == NULL) {
3865                 rc = -ENOMEM;
3866                 goto out;
3867         }
3868
3869         if (backup_cred(cifs_sb))
3870                 create_options |= CREATE_OPEN_BACKUP_INTENT;
3871
3872         oparms.tcon = tcon;
3873         oparms.cifs_sb = cifs_sb;
3874         oparms.desired_access = GENERIC_WRITE;
3875         oparms.create_options = create_options;
3876         oparms.disposition = FILE_CREATE;
3877         oparms.path = full_path;
3878         oparms.fid = &fid;
3879         oparms.reconnect = false;
3880
3881         if (tcon->ses->server->oplocks)
3882                 oplock = REQ_OPLOCK;
3883         else
3884                 oplock = 0;
3885         rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
3886         if (rc)
3887                 goto out;
3888
3889         /*
3890          * BB Do not bother to decode buf since no local inode yet to put
3891          * timestamps in, but we can reuse it safely.
3892          */
3893
3894         pdev = (struct win_dev *)buf;
3895         io_parms.pid = current->tgid;
3896         io_parms.tcon = tcon;
3897         io_parms.offset = 0;
3898         io_parms.length = sizeof(struct win_dev);
3899         iov[1].iov_base = buf;
3900         iov[1].iov_len = sizeof(struct win_dev);
3901         if (S_ISCHR(mode)) {
3902                 memcpy(pdev->type, "IntxCHR", 8);
3903                 pdev->major = cpu_to_le64(MAJOR(dev));
3904                 pdev->minor = cpu_to_le64(MINOR(dev));
3905                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
3906                                                         &bytes_written, iov, 1);
3907         } else if (S_ISBLK(mode)) {
3908                 memcpy(pdev->type, "IntxBLK", 8);
3909                 pdev->major = cpu_to_le64(MAJOR(dev));
3910                 pdev->minor = cpu_to_le64(MINOR(dev));
3911                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
3912                                                         &bytes_written, iov, 1);
3913         }
3914         tcon->ses->server->ops->close(xid, tcon, &fid);
3915         d_drop(dentry);
3916
3917         /* FIXME: add code here to set EAs */
3918 out:
3919         kfree(buf);
3920         return rc;
3921 }
3922
3923
3924 struct smb_version_operations smb20_operations = {
3925         .compare_fids = smb2_compare_fids,
3926         .setup_request = smb2_setup_request,
3927         .setup_async_request = smb2_setup_async_request,
3928         .check_receive = smb2_check_receive,
3929         .add_credits = smb2_add_credits,
3930         .set_credits = smb2_set_credits,
3931         .get_credits_field = smb2_get_credits_field,
3932         .get_credits = smb2_get_credits,
3933         .wait_mtu_credits = cifs_wait_mtu_credits,
3934         .get_next_mid = smb2_get_next_mid,
3935         .revert_current_mid = smb2_revert_current_mid,
3936         .read_data_offset = smb2_read_data_offset,
3937         .read_data_length = smb2_read_data_length,
3938         .map_error = map_smb2_to_linux_error,
3939         .find_mid = smb2_find_mid,
3940         .check_message = smb2_check_message,
3941         .dump_detail = smb2_dump_detail,
3942         .clear_stats = smb2_clear_stats,
3943         .print_stats = smb2_print_stats,
3944         .is_oplock_break = smb2_is_valid_oplock_break,
3945         .handle_cancelled_mid = smb2_handle_cancelled_mid,
3946         .downgrade_oplock = smb2_downgrade_oplock,
3947         .need_neg = smb2_need_neg,
3948         .negotiate = smb2_negotiate,
3949         .negotiate_wsize = smb2_negotiate_wsize,
3950         .negotiate_rsize = smb2_negotiate_rsize,
3951         .sess_setup = SMB2_sess_setup,
3952         .logoff = SMB2_logoff,
3953         .tree_connect = SMB2_tcon,
3954         .tree_disconnect = SMB2_tdis,
3955         .qfs_tcon = smb2_qfs_tcon,
3956         .is_path_accessible = smb2_is_path_accessible,
3957         .can_echo = smb2_can_echo,
3958         .echo = SMB2_echo,
3959         .query_path_info = smb2_query_path_info,
3960         .get_srv_inum = smb2_get_srv_inum,
3961         .query_file_info = smb2_query_file_info,
3962         .set_path_size = smb2_set_path_size,
3963         .set_file_size = smb2_set_file_size,
3964         .set_file_info = smb2_set_file_info,
3965         .set_compression = smb2_set_compression,
3966         .mkdir = smb2_mkdir,
3967         .mkdir_setinfo = smb2_mkdir_setinfo,
3968         .rmdir = smb2_rmdir,
3969         .unlink = smb2_unlink,
3970         .rename = smb2_rename_path,
3971         .create_hardlink = smb2_create_hardlink,
3972         .query_symlink = smb2_query_symlink,
3973         .query_mf_symlink = smb3_query_mf_symlink,
3974         .create_mf_symlink = smb3_create_mf_symlink,
3975         .open = smb2_open_file,
3976         .set_fid = smb2_set_fid,
3977         .close = smb2_close_file,
3978         .flush = smb2_flush_file,
3979         .async_readv = smb2_async_readv,
3980         .async_writev = smb2_async_writev,
3981         .sync_read = smb2_sync_read,
3982         .sync_write = smb2_sync_write,
3983         .query_dir_first = smb2_query_dir_first,
3984         .query_dir_next = smb2_query_dir_next,
3985         .close_dir = smb2_close_dir,
3986         .calc_smb_size = smb2_calc_size,
3987         .is_status_pending = smb2_is_status_pending,
3988         .is_session_expired = smb2_is_session_expired,
3989         .oplock_response = smb2_oplock_response,
3990         .queryfs = smb2_queryfs,
3991         .mand_lock = smb2_mand_lock,
3992         .mand_unlock_range = smb2_unlock_range,
3993         .push_mand_locks = smb2_push_mandatory_locks,
3994         .get_lease_key = smb2_get_lease_key,
3995         .set_lease_key = smb2_set_lease_key,
3996         .new_lease_key = smb2_new_lease_key,
3997         .calc_signature = smb2_calc_signature,
3998         .is_read_op = smb2_is_read_op,
3999         .set_oplock_level = smb2_set_oplock_level,
4000         .create_lease_buf = smb2_create_lease_buf,
4001         .parse_lease_buf = smb2_parse_lease_buf,
4002         .copychunk_range = smb2_copychunk_range,
4003         .wp_retry_size = smb2_wp_retry_size,
4004         .dir_needs_close = smb2_dir_needs_close,
4005         .get_dfs_refer = smb2_get_dfs_refer,
4006         .select_sectype = smb2_select_sectype,
4007 #ifdef CONFIG_CIFS_XATTR
4008         .query_all_EAs = smb2_query_eas,
4009         .set_EA = smb2_set_ea,
4010 #endif /* CIFS_XATTR */
4011 #ifdef CONFIG_CIFS_ACL
4012         .get_acl = get_smb2_acl,
4013         .get_acl_by_fid = get_smb2_acl_by_fid,
4014         .set_acl = set_smb2_acl,
4015 #endif /* CIFS_ACL */
4016         .next_header = smb2_next_header,
4017         .ioctl_query_info = smb2_ioctl_query_info,
4018         .make_node = smb2_make_node,
4019 };
4020
4021 struct smb_version_operations smb21_operations = {
4022         .compare_fids = smb2_compare_fids,
4023         .setup_request = smb2_setup_request,
4024         .setup_async_request = smb2_setup_async_request,
4025         .check_receive = smb2_check_receive,
4026         .add_credits = smb2_add_credits,
4027         .set_credits = smb2_set_credits,
4028         .get_credits_field = smb2_get_credits_field,
4029         .get_credits = smb2_get_credits,
4030         .wait_mtu_credits = smb2_wait_mtu_credits,
4031         .adjust_credits = smb2_adjust_credits,
4032         .get_next_mid = smb2_get_next_mid,
4033         .revert_current_mid = smb2_revert_current_mid,
4034         .read_data_offset = smb2_read_data_offset,
4035         .read_data_length = smb2_read_data_length,
4036         .map_error = map_smb2_to_linux_error,
4037         .find_mid = smb2_find_mid,
4038         .check_message = smb2_check_message,
4039         .dump_detail = smb2_dump_detail,
4040         .clear_stats = smb2_clear_stats,
4041         .print_stats = smb2_print_stats,
4042         .is_oplock_break = smb2_is_valid_oplock_break,
4043         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4044         .downgrade_oplock = smb21_downgrade_oplock,
4045         .need_neg = smb2_need_neg,
4046         .negotiate = smb2_negotiate,
4047         .negotiate_wsize = smb2_negotiate_wsize,
4048         .negotiate_rsize = smb2_negotiate_rsize,
4049         .sess_setup = SMB2_sess_setup,
4050         .logoff = SMB2_logoff,
4051         .tree_connect = SMB2_tcon,
4052         .tree_disconnect = SMB2_tdis,
4053         .qfs_tcon = smb2_qfs_tcon,
4054         .is_path_accessible = smb2_is_path_accessible,
4055         .can_echo = smb2_can_echo,
4056         .echo = SMB2_echo,
4057         .query_path_info = smb2_query_path_info,
4058         .get_srv_inum = smb2_get_srv_inum,
4059         .query_file_info = smb2_query_file_info,
4060         .set_path_size = smb2_set_path_size,
4061         .set_file_size = smb2_set_file_size,
4062         .set_file_info = smb2_set_file_info,
4063         .set_compression = smb2_set_compression,
4064         .mkdir = smb2_mkdir,
4065         .mkdir_setinfo = smb2_mkdir_setinfo,
4066         .rmdir = smb2_rmdir,
4067         .unlink = smb2_unlink,
4068         .rename = smb2_rename_path,
4069         .create_hardlink = smb2_create_hardlink,
4070         .query_symlink = smb2_query_symlink,
4071         .query_mf_symlink = smb3_query_mf_symlink,
4072         .create_mf_symlink = smb3_create_mf_symlink,
4073         .open = smb2_open_file,
4074         .set_fid = smb2_set_fid,
4075         .close = smb2_close_file,
4076         .flush = smb2_flush_file,
4077         .async_readv = smb2_async_readv,
4078         .async_writev = smb2_async_writev,
4079         .sync_read = smb2_sync_read,
4080         .sync_write = smb2_sync_write,
4081         .query_dir_first = smb2_query_dir_first,
4082         .query_dir_next = smb2_query_dir_next,
4083         .close_dir = smb2_close_dir,
4084         .calc_smb_size = smb2_calc_size,
4085         .is_status_pending = smb2_is_status_pending,
4086         .is_session_expired = smb2_is_session_expired,
4087         .oplock_response = smb2_oplock_response,
4088         .queryfs = smb2_queryfs,
4089         .mand_lock = smb2_mand_lock,
4090         .mand_unlock_range = smb2_unlock_range,
4091         .push_mand_locks = smb2_push_mandatory_locks,
4092         .get_lease_key = smb2_get_lease_key,
4093         .set_lease_key = smb2_set_lease_key,
4094         .new_lease_key = smb2_new_lease_key,
4095         .calc_signature = smb2_calc_signature,
4096         .is_read_op = smb21_is_read_op,
4097         .set_oplock_level = smb21_set_oplock_level,
4098         .create_lease_buf = smb2_create_lease_buf,
4099         .parse_lease_buf = smb2_parse_lease_buf,
4100         .copychunk_range = smb2_copychunk_range,
4101         .wp_retry_size = smb2_wp_retry_size,
4102         .dir_needs_close = smb2_dir_needs_close,
4103         .enum_snapshots = smb3_enum_snapshots,
4104         .get_dfs_refer = smb2_get_dfs_refer,
4105         .select_sectype = smb2_select_sectype,
4106 #ifdef CONFIG_CIFS_XATTR
4107         .query_all_EAs = smb2_query_eas,
4108         .set_EA = smb2_set_ea,
4109 #endif /* CIFS_XATTR */
4110 #ifdef CONFIG_CIFS_ACL
4111         .get_acl = get_smb2_acl,
4112         .get_acl_by_fid = get_smb2_acl_by_fid,
4113         .set_acl = set_smb2_acl,
4114 #endif /* CIFS_ACL */
4115         .next_header = smb2_next_header,
4116         .ioctl_query_info = smb2_ioctl_query_info,
4117         .make_node = smb2_make_node,
4118 };
4119
4120 struct smb_version_operations smb30_operations = {
4121         .compare_fids = smb2_compare_fids,
4122         .setup_request = smb2_setup_request,
4123         .setup_async_request = smb2_setup_async_request,
4124         .check_receive = smb2_check_receive,
4125         .add_credits = smb2_add_credits,
4126         .set_credits = smb2_set_credits,
4127         .get_credits_field = smb2_get_credits_field,
4128         .get_credits = smb2_get_credits,
4129         .wait_mtu_credits = smb2_wait_mtu_credits,
4130         .adjust_credits = smb2_adjust_credits,
4131         .get_next_mid = smb2_get_next_mid,
4132         .revert_current_mid = smb2_revert_current_mid,
4133         .read_data_offset = smb2_read_data_offset,
4134         .read_data_length = smb2_read_data_length,
4135         .map_error = map_smb2_to_linux_error,
4136         .find_mid = smb2_find_mid,
4137         .check_message = smb2_check_message,
4138         .dump_detail = smb2_dump_detail,
4139         .clear_stats = smb2_clear_stats,
4140         .print_stats = smb2_print_stats,
4141         .dump_share_caps = smb2_dump_share_caps,
4142         .is_oplock_break = smb2_is_valid_oplock_break,
4143         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4144         .downgrade_oplock = smb21_downgrade_oplock,
4145         .need_neg = smb2_need_neg,
4146         .negotiate = smb2_negotiate,
4147         .negotiate_wsize = smb3_negotiate_wsize,
4148         .negotiate_rsize = smb3_negotiate_rsize,
4149         .sess_setup = SMB2_sess_setup,
4150         .logoff = SMB2_logoff,
4151         .tree_connect = SMB2_tcon,
4152         .tree_disconnect = SMB2_tdis,
4153         .qfs_tcon = smb3_qfs_tcon,
4154         .is_path_accessible = smb2_is_path_accessible,
4155         .can_echo = smb2_can_echo,
4156         .echo = SMB2_echo,
4157         .query_path_info = smb2_query_path_info,
4158         .get_srv_inum = smb2_get_srv_inum,
4159         .query_file_info = smb2_query_file_info,
4160         .set_path_size = smb2_set_path_size,
4161         .set_file_size = smb2_set_file_size,
4162         .set_file_info = smb2_set_file_info,
4163         .set_compression = smb2_set_compression,
4164         .mkdir = smb2_mkdir,
4165         .mkdir_setinfo = smb2_mkdir_setinfo,
4166         .rmdir = smb2_rmdir,
4167         .unlink = smb2_unlink,
4168         .rename = smb2_rename_path,
4169         .create_hardlink = smb2_create_hardlink,
4170         .query_symlink = smb2_query_symlink,
4171         .query_mf_symlink = smb3_query_mf_symlink,
4172         .create_mf_symlink = smb3_create_mf_symlink,
4173         .open = smb2_open_file,
4174         .set_fid = smb2_set_fid,
4175         .close = smb2_close_file,
4176         .flush = smb2_flush_file,
4177         .async_readv = smb2_async_readv,
4178         .async_writev = smb2_async_writev,
4179         .sync_read = smb2_sync_read,
4180         .sync_write = smb2_sync_write,
4181         .query_dir_first = smb2_query_dir_first,
4182         .query_dir_next = smb2_query_dir_next,
4183         .close_dir = smb2_close_dir,
4184         .calc_smb_size = smb2_calc_size,
4185         .is_status_pending = smb2_is_status_pending,
4186         .is_session_expired = smb2_is_session_expired,
4187         .oplock_response = smb2_oplock_response,
4188         .queryfs = smb2_queryfs,
4189         .mand_lock = smb2_mand_lock,
4190         .mand_unlock_range = smb2_unlock_range,
4191         .push_mand_locks = smb2_push_mandatory_locks,
4192         .get_lease_key = smb2_get_lease_key,
4193         .set_lease_key = smb2_set_lease_key,
4194         .new_lease_key = smb2_new_lease_key,
4195         .generate_signingkey = generate_smb30signingkey,
4196         .calc_signature = smb3_calc_signature,
4197         .set_integrity  = smb3_set_integrity,
4198         .is_read_op = smb21_is_read_op,
4199         .set_oplock_level = smb3_set_oplock_level,
4200         .create_lease_buf = smb3_create_lease_buf,
4201         .parse_lease_buf = smb3_parse_lease_buf,
4202         .copychunk_range = smb2_copychunk_range,
4203         .duplicate_extents = smb2_duplicate_extents,
4204         .validate_negotiate = smb3_validate_negotiate,
4205         .wp_retry_size = smb2_wp_retry_size,
4206         .dir_needs_close = smb2_dir_needs_close,
4207         .fallocate = smb3_fallocate,
4208         .enum_snapshots = smb3_enum_snapshots,
4209         .init_transform_rq = smb3_init_transform_rq,
4210         .is_transform_hdr = smb3_is_transform_hdr,
4211         .receive_transform = smb3_receive_transform,
4212         .get_dfs_refer = smb2_get_dfs_refer,
4213         .select_sectype = smb2_select_sectype,
4214 #ifdef CONFIG_CIFS_XATTR
4215         .query_all_EAs = smb2_query_eas,
4216         .set_EA = smb2_set_ea,
4217 #endif /* CIFS_XATTR */
4218 #ifdef CONFIG_CIFS_ACL
4219         .get_acl = get_smb2_acl,
4220         .get_acl_by_fid = get_smb2_acl_by_fid,
4221         .set_acl = set_smb2_acl,
4222 #endif /* CIFS_ACL */
4223         .next_header = smb2_next_header,
4224         .ioctl_query_info = smb2_ioctl_query_info,
4225         .make_node = smb2_make_node,
4226 };
4227
4228 struct smb_version_operations smb311_operations = {
4229         .compare_fids = smb2_compare_fids,
4230         .setup_request = smb2_setup_request,
4231         .setup_async_request = smb2_setup_async_request,
4232         .check_receive = smb2_check_receive,
4233         .add_credits = smb2_add_credits,
4234         .set_credits = smb2_set_credits,
4235         .get_credits_field = smb2_get_credits_field,
4236         .get_credits = smb2_get_credits,
4237         .wait_mtu_credits = smb2_wait_mtu_credits,
4238         .adjust_credits = smb2_adjust_credits,
4239         .get_next_mid = smb2_get_next_mid,
4240         .revert_current_mid = smb2_revert_current_mid,
4241         .read_data_offset = smb2_read_data_offset,
4242         .read_data_length = smb2_read_data_length,
4243         .map_error = map_smb2_to_linux_error,
4244         .find_mid = smb2_find_mid,
4245         .check_message = smb2_check_message,
4246         .dump_detail = smb2_dump_detail,
4247         .clear_stats = smb2_clear_stats,
4248         .print_stats = smb2_print_stats,
4249         .dump_share_caps = smb2_dump_share_caps,
4250         .is_oplock_break = smb2_is_valid_oplock_break,
4251         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4252         .downgrade_oplock = smb21_downgrade_oplock,
4253         .need_neg = smb2_need_neg,
4254         .negotiate = smb2_negotiate,
4255         .negotiate_wsize = smb3_negotiate_wsize,
4256         .negotiate_rsize = smb3_negotiate_rsize,
4257         .sess_setup = SMB2_sess_setup,
4258         .logoff = SMB2_logoff,
4259         .tree_connect = SMB2_tcon,
4260         .tree_disconnect = SMB2_tdis,
4261         .qfs_tcon = smb3_qfs_tcon,
4262         .is_path_accessible = smb2_is_path_accessible,
4263         .can_echo = smb2_can_echo,
4264         .echo = SMB2_echo,
4265         .query_path_info = smb2_query_path_info,
4266         .get_srv_inum = smb2_get_srv_inum,
4267         .query_file_info = smb2_query_file_info,
4268         .set_path_size = smb2_set_path_size,
4269         .set_file_size = smb2_set_file_size,
4270         .set_file_info = smb2_set_file_info,
4271         .set_compression = smb2_set_compression,
4272         .mkdir = smb2_mkdir,
4273         .mkdir_setinfo = smb2_mkdir_setinfo,
4274         .posix_mkdir = smb311_posix_mkdir,
4275         .rmdir = smb2_rmdir,
4276         .unlink = smb2_unlink,
4277         .rename = smb2_rename_path,
4278         .create_hardlink = smb2_create_hardlink,
4279         .query_symlink = smb2_query_symlink,
4280         .query_mf_symlink = smb3_query_mf_symlink,
4281         .create_mf_symlink = smb3_create_mf_symlink,
4282         .open = smb2_open_file,
4283         .set_fid = smb2_set_fid,
4284         .close = smb2_close_file,
4285         .flush = smb2_flush_file,
4286         .async_readv = smb2_async_readv,
4287         .async_writev = smb2_async_writev,
4288         .sync_read = smb2_sync_read,
4289         .sync_write = smb2_sync_write,
4290         .query_dir_first = smb2_query_dir_first,
4291         .query_dir_next = smb2_query_dir_next,
4292         .close_dir = smb2_close_dir,
4293         .calc_smb_size = smb2_calc_size,
4294         .is_status_pending = smb2_is_status_pending,
4295         .is_session_expired = smb2_is_session_expired,
4296         .oplock_response = smb2_oplock_response,
4297         .queryfs = smb311_queryfs,
4298         .mand_lock = smb2_mand_lock,
4299         .mand_unlock_range = smb2_unlock_range,
4300         .push_mand_locks = smb2_push_mandatory_locks,
4301         .get_lease_key = smb2_get_lease_key,
4302         .set_lease_key = smb2_set_lease_key,
4303         .new_lease_key = smb2_new_lease_key,
4304         .generate_signingkey = generate_smb311signingkey,
4305         .calc_signature = smb3_calc_signature,
4306         .set_integrity  = smb3_set_integrity,
4307         .is_read_op = smb21_is_read_op,
4308         .set_oplock_level = smb3_set_oplock_level,
4309         .create_lease_buf = smb3_create_lease_buf,
4310         .parse_lease_buf = smb3_parse_lease_buf,
4311         .copychunk_range = smb2_copychunk_range,
4312         .duplicate_extents = smb2_duplicate_extents,
4313 /*      .validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
4314         .wp_retry_size = smb2_wp_retry_size,
4315         .dir_needs_close = smb2_dir_needs_close,
4316         .fallocate = smb3_fallocate,
4317         .enum_snapshots = smb3_enum_snapshots,
4318         .init_transform_rq = smb3_init_transform_rq,
4319         .is_transform_hdr = smb3_is_transform_hdr,
4320         .receive_transform = smb3_receive_transform,
4321         .get_dfs_refer = smb2_get_dfs_refer,
4322         .select_sectype = smb2_select_sectype,
4323 #ifdef CONFIG_CIFS_XATTR
4324         .query_all_EAs = smb2_query_eas,
4325         .set_EA = smb2_set_ea,
4326 #endif /* CIFS_XATTR */
4327 #ifdef CONFIG_CIFS_ACL
4328         .get_acl = get_smb2_acl,
4329         .get_acl_by_fid = get_smb2_acl_by_fid,
4330         .set_acl = set_smb2_acl,
4331 #endif /* CIFS_ACL */
4332         .next_header = smb2_next_header,
4333         .ioctl_query_info = smb2_ioctl_query_info,
4334         .make_node = smb2_make_node,
4335 };
4336
4337 struct smb_version_values smb20_values = {
4338         .version_string = SMB20_VERSION_STRING,
4339         .protocol_id = SMB20_PROT_ID,
4340         .req_capabilities = 0, /* MBZ */
4341         .large_lock_type = 0,
4342         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4343         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4344         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4345         .header_size = sizeof(struct smb2_sync_hdr),
4346         .header_preamble_size = 0,
4347         .max_header_size = MAX_SMB2_HDR_SIZE,
4348         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4349         .lock_cmd = SMB2_LOCK,
4350         .cap_unix = 0,
4351         .cap_nt_find = SMB2_NT_FIND,
4352         .cap_large_files = SMB2_LARGE_FILES,
4353         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4354         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4355         .create_lease_size = sizeof(struct create_lease),
4356 };
4357
4358 struct smb_version_values smb21_values = {
4359         .version_string = SMB21_VERSION_STRING,
4360         .protocol_id = SMB21_PROT_ID,
4361         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
4362         .large_lock_type = 0,
4363         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4364         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4365         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4366         .header_size = sizeof(struct smb2_sync_hdr),
4367         .header_preamble_size = 0,
4368         .max_header_size = MAX_SMB2_HDR_SIZE,
4369         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4370         .lock_cmd = SMB2_LOCK,
4371         .cap_unix = 0,
4372         .cap_nt_find = SMB2_NT_FIND,
4373         .cap_large_files = SMB2_LARGE_FILES,
4374         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4375         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4376         .create_lease_size = sizeof(struct create_lease),
4377 };
4378
4379 struct smb_version_values smb3any_values = {
4380         .version_string = SMB3ANY_VERSION_STRING,
4381         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
4382         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
4383         .large_lock_type = 0,
4384         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4385         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4386         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4387         .header_size = sizeof(struct smb2_sync_hdr),
4388         .header_preamble_size = 0,
4389         .max_header_size = MAX_SMB2_HDR_SIZE,
4390         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4391         .lock_cmd = SMB2_LOCK,
4392         .cap_unix = 0,
4393         .cap_nt_find = SMB2_NT_FIND,
4394         .cap_large_files = SMB2_LARGE_FILES,
4395         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4396         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4397         .create_lease_size = sizeof(struct create_lease_v2),
4398 };
4399
4400 struct smb_version_values smbdefault_values = {
4401         .version_string = SMBDEFAULT_VERSION_STRING,
4402         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
4403         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
4404         .large_lock_type = 0,
4405         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4406         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4407         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4408         .header_size = sizeof(struct smb2_sync_hdr),
4409         .header_preamble_size = 0,
4410         .max_header_size = MAX_SMB2_HDR_SIZE,
4411         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4412         .lock_cmd = SMB2_LOCK,
4413         .cap_unix = 0,
4414         .cap_nt_find = SMB2_NT_FIND,
4415         .cap_large_files = SMB2_LARGE_FILES,
4416         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4417         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4418         .create_lease_size = sizeof(struct create_lease_v2),
4419 };
4420
4421 struct smb_version_values smb30_values = {
4422         .version_string = SMB30_VERSION_STRING,
4423         .protocol_id = SMB30_PROT_ID,
4424         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
4425         .large_lock_type = 0,
4426         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4427         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4428         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4429         .header_size = sizeof(struct smb2_sync_hdr),
4430         .header_preamble_size = 0,
4431         .max_header_size = MAX_SMB2_HDR_SIZE,
4432         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4433         .lock_cmd = SMB2_LOCK,
4434         .cap_unix = 0,
4435         .cap_nt_find = SMB2_NT_FIND,
4436         .cap_large_files = SMB2_LARGE_FILES,
4437         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4438         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4439         .create_lease_size = sizeof(struct create_lease_v2),
4440 };
4441
4442 struct smb_version_values smb302_values = {
4443         .version_string = SMB302_VERSION_STRING,
4444         .protocol_id = SMB302_PROT_ID,
4445         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
4446         .large_lock_type = 0,
4447         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4448         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4449         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4450         .header_size = sizeof(struct smb2_sync_hdr),
4451         .header_preamble_size = 0,
4452         .max_header_size = MAX_SMB2_HDR_SIZE,
4453         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4454         .lock_cmd = SMB2_LOCK,
4455         .cap_unix = 0,
4456         .cap_nt_find = SMB2_NT_FIND,
4457         .cap_large_files = SMB2_LARGE_FILES,
4458         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4459         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4460         .create_lease_size = sizeof(struct create_lease_v2),
4461 };
4462
4463 struct smb_version_values smb311_values = {
4464         .version_string = SMB311_VERSION_STRING,
4465         .protocol_id = SMB311_PROT_ID,
4466         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION | SMB2_GLOBAL_CAP_DIRECTORY_LEASING,
4467         .large_lock_type = 0,
4468         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4469         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4470         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4471         .header_size = sizeof(struct smb2_sync_hdr),
4472         .header_preamble_size = 0,
4473         .max_header_size = MAX_SMB2_HDR_SIZE,
4474         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4475         .lock_cmd = SMB2_LOCK,
4476         .cap_unix = 0,
4477         .cap_nt_find = SMB2_NT_FIND,
4478         .cap_large_files = SMB2_LARGE_FILES,
4479         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4480         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4481         .create_lease_size = sizeof(struct create_lease_v2),
4482 };