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)
2393                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2394         if (!rc || !err_iov.iov_base) {
2395                 rc = -ENOENT;
2396                 goto free_path;
2397         }
2398
2399         err_buf = err_iov.iov_base;
2400         if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
2401             err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE) {
2402                 rc = -ENOENT;
2403                 goto querty_exit;
2404         }
2405
2406         /* open must fail on symlink - reset rc */
2407         rc = 0;
2408         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
2409         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
2410         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
2411         print_len = le16_to_cpu(symlink->PrintNameLength);
2412         print_offset = le16_to_cpu(symlink->PrintNameOffset);
2413
2414         if (err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
2415                 rc = -ENOENT;
2416                 goto querty_exit;
2417         }
2418
2419         if (err_iov.iov_len <
2420             SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
2421                 rc = -ENOENT;
2422                 goto querty_exit;
2423         }
2424
2425         *target_path = cifs_strndup_from_utf16(
2426                                 (char *)symlink->PathBuffer + sub_offset,
2427                                 sub_len, true, cifs_sb->local_nls);
2428         if (!(*target_path)) {
2429                 rc = -ENOMEM;
2430                 goto querty_exit;
2431         }
2432         convert_delimiter(*target_path, '/');
2433         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2434
2435  querty_exit:
2436         free_rsp_buf(resp_buftype, err_buf);
2437  free_path:
2438         kfree(utf16_path);
2439         return rc;
2440 }
2441
2442 #ifdef CONFIG_CIFS_ACL
2443 static struct cifs_ntsd *
2444 get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
2445                 const struct cifs_fid *cifsfid, u32 *pacllen)
2446 {
2447         struct cifs_ntsd *pntsd = NULL;
2448         unsigned int xid;
2449         int rc = -EOPNOTSUPP;
2450         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2451
2452         if (IS_ERR(tlink))
2453                 return ERR_CAST(tlink);
2454
2455         xid = get_xid();
2456         cifs_dbg(FYI, "trying to get acl\n");
2457
2458         rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
2459                             cifsfid->volatile_fid, (void **)&pntsd, pacllen);
2460         free_xid(xid);
2461
2462         cifs_put_tlink(tlink);
2463
2464         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
2465         if (rc)
2466                 return ERR_PTR(rc);
2467         return pntsd;
2468
2469 }
2470
2471 static struct cifs_ntsd *
2472 get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
2473                 const char *path, u32 *pacllen)
2474 {
2475         struct cifs_ntsd *pntsd = NULL;
2476         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2477         unsigned int xid;
2478         int rc;
2479         struct cifs_tcon *tcon;
2480         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2481         struct cifs_fid fid;
2482         struct cifs_open_parms oparms;
2483         __le16 *utf16_path;
2484
2485         cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
2486         if (IS_ERR(tlink))
2487                 return ERR_CAST(tlink);
2488
2489         tcon = tlink_tcon(tlink);
2490         xid = get_xid();
2491
2492         if (backup_cred(cifs_sb))
2493                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2494         else
2495                 oparms.create_options = 0;
2496
2497         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2498         if (!utf16_path) {
2499                 rc = -ENOMEM;
2500                 free_xid(xid);
2501                 return ERR_PTR(rc);
2502         }
2503
2504         oparms.tcon = tcon;
2505         oparms.desired_access = READ_CONTROL;
2506         oparms.disposition = FILE_OPEN;
2507         oparms.fid = &fid;
2508         oparms.reconnect = false;
2509
2510         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
2511         kfree(utf16_path);
2512         if (!rc) {
2513                 rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
2514                             fid.volatile_fid, (void **)&pntsd, pacllen);
2515                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2516         }
2517
2518         cifs_put_tlink(tlink);
2519         free_xid(xid);
2520
2521         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
2522         if (rc)
2523                 return ERR_PTR(rc);
2524         return pntsd;
2525 }
2526
2527 #ifdef CONFIG_CIFS_ACL
2528 static int
2529 set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
2530                 struct inode *inode, const char *path, int aclflag)
2531 {
2532         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2533         unsigned int xid;
2534         int rc, access_flags = 0;
2535         struct cifs_tcon *tcon;
2536         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2537         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2538         struct cifs_fid fid;
2539         struct cifs_open_parms oparms;
2540         __le16 *utf16_path;
2541
2542         cifs_dbg(FYI, "set smb3 acl for path %s\n", path);
2543         if (IS_ERR(tlink))
2544                 return PTR_ERR(tlink);
2545
2546         tcon = tlink_tcon(tlink);
2547         xid = get_xid();
2548
2549         if (backup_cred(cifs_sb))
2550                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2551         else
2552                 oparms.create_options = 0;
2553
2554         if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP)
2555                 access_flags = WRITE_OWNER;
2556         else
2557                 access_flags = WRITE_DAC;
2558
2559         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2560         if (!utf16_path) {
2561                 rc = -ENOMEM;
2562                 free_xid(xid);
2563                 return rc;
2564         }
2565
2566         oparms.tcon = tcon;
2567         oparms.desired_access = access_flags;
2568         oparms.disposition = FILE_OPEN;
2569         oparms.path = path;
2570         oparms.fid = &fid;
2571         oparms.reconnect = false;
2572
2573         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
2574         kfree(utf16_path);
2575         if (!rc) {
2576                 rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
2577                             fid.volatile_fid, pnntsd, acllen, aclflag);
2578                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2579         }
2580
2581         cifs_put_tlink(tlink);
2582         free_xid(xid);
2583         return rc;
2584 }
2585 #endif /* CIFS_ACL */
2586
2587 /* Retrieve an ACL from the server */
2588 static struct cifs_ntsd *
2589 get_smb2_acl(struct cifs_sb_info *cifs_sb,
2590                                       struct inode *inode, const char *path,
2591                                       u32 *pacllen)
2592 {
2593         struct cifs_ntsd *pntsd = NULL;
2594         struct cifsFileInfo *open_file = NULL;
2595
2596         if (inode)
2597                 open_file = find_readable_file(CIFS_I(inode), true);
2598         if (!open_file)
2599                 return get_smb2_acl_by_path(cifs_sb, path, pacllen);
2600
2601         pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen);
2602         cifsFileInfo_put(open_file);
2603         return pntsd;
2604 }
2605 #endif
2606
2607 static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
2608                             loff_t offset, loff_t len, bool keep_size)
2609 {
2610         struct cifs_ses *ses = tcon->ses;
2611         struct inode *inode;
2612         struct cifsInodeInfo *cifsi;
2613         struct cifsFileInfo *cfile = file->private_data;
2614         struct file_zero_data_information fsctl_buf;
2615         struct smb_rqst rqst[2];
2616         int resp_buftype[2];
2617         struct kvec rsp_iov[2];
2618         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
2619         struct kvec si_iov[1];
2620         unsigned int size[1];
2621         void *data[1];
2622         long rc;
2623         unsigned int xid;
2624         int num = 0, flags = 0;
2625         __le64 eof;
2626
2627         xid = get_xid();
2628
2629         inode = d_inode(cfile->dentry);
2630         cifsi = CIFS_I(inode);
2631
2632         trace_smb3_zero_enter(xid, cfile->fid.persistent_fid, tcon->tid,
2633                               ses->Suid, offset, len);
2634
2635
2636         /* if file not oplocked can't be sure whether asking to extend size */
2637         if (!CIFS_CACHE_READ(cifsi))
2638                 if (keep_size == false) {
2639                         rc = -EOPNOTSUPP;
2640                         trace_smb3_zero_err(xid, cfile->fid.persistent_fid,
2641                                 tcon->tid, ses->Suid, offset, len, rc);
2642                         free_xid(xid);
2643                         return rc;
2644                 }
2645
2646         /*
2647          * Must check if file sparse since fallocate -z (zero range) assumes
2648          * non-sparse allocation
2649          */
2650         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE)) {
2651                 rc = -EOPNOTSUPP;
2652                 trace_smb3_zero_err(xid, cfile->fid.persistent_fid, tcon->tid,
2653                               ses->Suid, offset, len, rc);
2654                 free_xid(xid);
2655                 return rc;
2656         }
2657
2658         cifs_dbg(FYI, "offset %lld len %lld", offset, len);
2659
2660         fsctl_buf.FileOffset = cpu_to_le64(offset);
2661         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
2662
2663         if (smb3_encryption_required(tcon))
2664                 flags |= CIFS_TRANSFORM_REQ;
2665
2666         memset(rqst, 0, sizeof(rqst));
2667         resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
2668         memset(rsp_iov, 0, sizeof(rsp_iov));
2669
2670
2671         memset(&io_iov, 0, sizeof(io_iov));
2672         rqst[num].rq_iov = io_iov;
2673         rqst[num].rq_nvec = SMB2_IOCTL_IOV_SIZE;
2674         rc = SMB2_ioctl_init(tcon, &rqst[num++], cfile->fid.persistent_fid,
2675                              cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
2676                              true /* is_fctl */, (char *)&fsctl_buf,
2677                              sizeof(struct file_zero_data_information),
2678                              CIFSMaxBufSize);
2679         if (rc)
2680                 goto zero_range_exit;
2681
2682         /*
2683          * do we also need to change the size of the file?
2684          */
2685         if (keep_size == false && i_size_read(inode) < offset + len) {
2686                 smb2_set_next_command(tcon, &rqst[0]);
2687
2688                 memset(&si_iov, 0, sizeof(si_iov));
2689                 rqst[num].rq_iov = si_iov;
2690                 rqst[num].rq_nvec = 1;
2691
2692                 eof = cpu_to_le64(offset + len);
2693                 size[0] = 8; /* sizeof __le64 */
2694                 data[0] = &eof;
2695
2696                 rc = SMB2_set_info_init(tcon, &rqst[num++],
2697                                         cfile->fid.persistent_fid,
2698                                         cfile->fid.persistent_fid,
2699                                         current->tgid,
2700                                         FILE_END_OF_FILE_INFORMATION,
2701                                         SMB2_O_INFO_FILE, 0, data, size);
2702                 smb2_set_related(&rqst[1]);
2703         }
2704
2705         rc = compound_send_recv(xid, ses, flags, num, rqst,
2706                                 resp_buftype, rsp_iov);
2707
2708  zero_range_exit:
2709         SMB2_ioctl_free(&rqst[0]);
2710         SMB2_set_info_free(&rqst[1]);
2711         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2712         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2713         free_xid(xid);
2714         if (rc)
2715                 trace_smb3_zero_err(xid, cfile->fid.persistent_fid, tcon->tid,
2716                               ses->Suid, offset, len, rc);
2717         else
2718                 trace_smb3_zero_done(xid, cfile->fid.persistent_fid, tcon->tid,
2719                               ses->Suid, offset, len);
2720         return rc;
2721 }
2722
2723 static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
2724                             loff_t offset, loff_t len)
2725 {
2726         struct inode *inode;
2727         struct cifsInodeInfo *cifsi;
2728         struct cifsFileInfo *cfile = file->private_data;
2729         struct file_zero_data_information fsctl_buf;
2730         long rc;
2731         unsigned int xid;
2732         __u8 set_sparse = 1;
2733
2734         xid = get_xid();
2735
2736         inode = d_inode(cfile->dentry);
2737         cifsi = CIFS_I(inode);
2738
2739         /* Need to make file sparse, if not already, before freeing range. */
2740         /* Consider adding equivalent for compressed since it could also work */
2741         if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse)) {
2742                 rc = -EOPNOTSUPP;
2743                 free_xid(xid);
2744                 return rc;
2745         }
2746
2747         cifs_dbg(FYI, "offset %lld len %lld", offset, len);
2748
2749         fsctl_buf.FileOffset = cpu_to_le64(offset);
2750         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
2751
2752         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
2753                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
2754                         true /* is_fctl */, (char *)&fsctl_buf,
2755                         sizeof(struct file_zero_data_information),
2756                         CIFSMaxBufSize, NULL, NULL);
2757         free_xid(xid);
2758         return rc;
2759 }
2760
2761 static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
2762                             loff_t off, loff_t len, bool keep_size)
2763 {
2764         struct inode *inode;
2765         struct cifsInodeInfo *cifsi;
2766         struct cifsFileInfo *cfile = file->private_data;
2767         long rc = -EOPNOTSUPP;
2768         unsigned int xid;
2769         __le64 eof;
2770
2771         xid = get_xid();
2772
2773         inode = d_inode(cfile->dentry);
2774         cifsi = CIFS_I(inode);
2775
2776         trace_smb3_falloc_enter(xid, cfile->fid.persistent_fid, tcon->tid,
2777                                 tcon->ses->Suid, off, len);
2778         /* if file not oplocked can't be sure whether asking to extend size */
2779         if (!CIFS_CACHE_READ(cifsi))
2780                 if (keep_size == false) {
2781                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
2782                                 tcon->tid, tcon->ses->Suid, off, len, rc);
2783                         free_xid(xid);
2784                         return rc;
2785                 }
2786
2787         /*
2788          * Files are non-sparse by default so falloc may be a no-op
2789          * Must check if file sparse. If not sparse, and not extending
2790          * then no need to do anything since file already allocated
2791          */
2792         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
2793                 if (keep_size == true)
2794                         rc = 0;
2795                 /* check if extending file */
2796                 else if (i_size_read(inode) >= off + len)
2797                         /* not extending file and already not sparse */
2798                         rc = 0;
2799                 /* BB: in future add else clause to extend file */
2800                 else
2801                         rc = -EOPNOTSUPP;
2802                 if (rc)
2803                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
2804                                 tcon->tid, tcon->ses->Suid, off, len, rc);
2805                 else
2806                         trace_smb3_falloc_done(xid, cfile->fid.persistent_fid,
2807                                 tcon->tid, tcon->ses->Suid, off, len);
2808                 free_xid(xid);
2809                 return rc;
2810         }
2811
2812         if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
2813                 /*
2814                  * Check if falloc starts within first few pages of file
2815                  * and ends within a few pages of the end of file to
2816                  * ensure that most of file is being forced to be
2817                  * fallocated now. If so then setting whole file sparse
2818                  * ie potentially making a few extra pages at the beginning
2819                  * or end of the file non-sparse via set_sparse is harmless.
2820                  */
2821                 if ((off > 8192) || (off + len + 8192 < i_size_read(inode))) {
2822                         rc = -EOPNOTSUPP;
2823                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
2824                                 tcon->tid, tcon->ses->Suid, off, len, rc);
2825                         free_xid(xid);
2826                         return rc;
2827                 }
2828
2829                 smb2_set_sparse(xid, tcon, cfile, inode, false);
2830                 rc = 0;
2831         } else {
2832                 smb2_set_sparse(xid, tcon, cfile, inode, false);
2833                 rc = 0;
2834                 if (i_size_read(inode) < off + len) {
2835                         eof = cpu_to_le64(off + len);
2836                         rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
2837                                           cfile->fid.volatile_fid, cfile->pid,
2838                                           &eof);
2839                 }
2840         }
2841
2842         if (rc)
2843                 trace_smb3_falloc_err(xid, cfile->fid.persistent_fid, tcon->tid,
2844                                 tcon->ses->Suid, off, len, rc);
2845         else
2846                 trace_smb3_falloc_done(xid, cfile->fid.persistent_fid, tcon->tid,
2847                                 tcon->ses->Suid, off, len);
2848
2849         free_xid(xid);
2850         return rc;
2851 }
2852
2853
2854 static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
2855                            loff_t off, loff_t len)
2856 {
2857         /* KEEP_SIZE already checked for by do_fallocate */
2858         if (mode & FALLOC_FL_PUNCH_HOLE)
2859                 return smb3_punch_hole(file, tcon, off, len);
2860         else if (mode & FALLOC_FL_ZERO_RANGE) {
2861                 if (mode & FALLOC_FL_KEEP_SIZE)
2862                         return smb3_zero_range(file, tcon, off, len, true);
2863                 return smb3_zero_range(file, tcon, off, len, false);
2864         } else if (mode == FALLOC_FL_KEEP_SIZE)
2865                 return smb3_simple_falloc(file, tcon, off, len, true);
2866         else if (mode == 0)
2867                 return smb3_simple_falloc(file, tcon, off, len, false);
2868
2869         return -EOPNOTSUPP;
2870 }
2871
2872 static void
2873 smb2_downgrade_oplock(struct TCP_Server_Info *server,
2874                         struct cifsInodeInfo *cinode, bool set_level2)
2875 {
2876         if (set_level2)
2877                 server->ops->set_oplock_level(cinode, SMB2_OPLOCK_LEVEL_II,
2878                                                 0, NULL);
2879         else
2880                 server->ops->set_oplock_level(cinode, 0, 0, NULL);
2881 }
2882
2883 static void
2884 smb21_downgrade_oplock(struct TCP_Server_Info *server,
2885                        struct cifsInodeInfo *cinode, bool set_level2)
2886 {
2887         server->ops->set_oplock_level(cinode,
2888                                       set_level2 ? SMB2_LEASE_READ_CACHING_HE :
2889                                       0, 0, NULL);
2890 }
2891
2892 static void
2893 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
2894                       unsigned int epoch, bool *purge_cache)
2895 {
2896         oplock &= 0xFF;
2897         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
2898                 return;
2899         if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2900                 cinode->oplock = CIFS_CACHE_RHW_FLG;
2901                 cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
2902                          &cinode->vfs_inode);
2903         } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
2904                 cinode->oplock = CIFS_CACHE_RW_FLG;
2905                 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
2906                          &cinode->vfs_inode);
2907         } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
2908                 cinode->oplock = CIFS_CACHE_READ_FLG;
2909                 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
2910                          &cinode->vfs_inode);
2911         } else
2912                 cinode->oplock = 0;
2913 }
2914
2915 static void
2916 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
2917                        unsigned int epoch, bool *purge_cache)
2918 {
2919         char message[5] = {0};
2920
2921         oplock &= 0xFF;
2922         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
2923                 return;
2924
2925         cinode->oplock = 0;
2926         if (oplock & SMB2_LEASE_READ_CACHING_HE) {
2927                 cinode->oplock |= CIFS_CACHE_READ_FLG;
2928                 strcat(message, "R");
2929         }
2930         if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
2931                 cinode->oplock |= CIFS_CACHE_HANDLE_FLG;
2932                 strcat(message, "H");
2933         }
2934         if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
2935                 cinode->oplock |= CIFS_CACHE_WRITE_FLG;
2936                 strcat(message, "W");
2937         }
2938         if (!cinode->oplock)
2939                 strcat(message, "None");
2940         cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
2941                  &cinode->vfs_inode);
2942 }
2943
2944 static void
2945 smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
2946                       unsigned int epoch, bool *purge_cache)
2947 {
2948         unsigned int old_oplock = cinode->oplock;
2949
2950         smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
2951
2952         if (purge_cache) {
2953                 *purge_cache = false;
2954                 if (old_oplock == CIFS_CACHE_READ_FLG) {
2955                         if (cinode->oplock == CIFS_CACHE_READ_FLG &&
2956                             (epoch - cinode->epoch > 0))
2957                                 *purge_cache = true;
2958                         else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
2959                                  (epoch - cinode->epoch > 1))
2960                                 *purge_cache = true;
2961                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
2962                                  (epoch - cinode->epoch > 1))
2963                                 *purge_cache = true;
2964                         else if (cinode->oplock == 0 &&
2965                                  (epoch - cinode->epoch > 0))
2966                                 *purge_cache = true;
2967                 } else if (old_oplock == CIFS_CACHE_RH_FLG) {
2968                         if (cinode->oplock == CIFS_CACHE_RH_FLG &&
2969                             (epoch - cinode->epoch > 0))
2970                                 *purge_cache = true;
2971                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
2972                                  (epoch - cinode->epoch > 1))
2973                                 *purge_cache = true;
2974                 }
2975                 cinode->epoch = epoch;
2976         }
2977 }
2978
2979 static bool
2980 smb2_is_read_op(__u32 oplock)
2981 {
2982         return oplock == SMB2_OPLOCK_LEVEL_II;
2983 }
2984
2985 static bool
2986 smb21_is_read_op(__u32 oplock)
2987 {
2988         return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
2989                !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
2990 }
2991
2992 static __le32
2993 map_oplock_to_lease(u8 oplock)
2994 {
2995         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
2996                 return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
2997         else if (oplock == SMB2_OPLOCK_LEVEL_II)
2998                 return SMB2_LEASE_READ_CACHING;
2999         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
3000                 return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
3001                        SMB2_LEASE_WRITE_CACHING;
3002         return 0;
3003 }
3004
3005 static char *
3006 smb2_create_lease_buf(u8 *lease_key, u8 oplock)
3007 {
3008         struct create_lease *buf;
3009
3010         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
3011         if (!buf)
3012                 return NULL;
3013
3014         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
3015         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
3016
3017         buf->ccontext.DataOffset = cpu_to_le16(offsetof
3018                                         (struct create_lease, lcontext));
3019         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
3020         buf->ccontext.NameOffset = cpu_to_le16(offsetof
3021                                 (struct create_lease, Name));
3022         buf->ccontext.NameLength = cpu_to_le16(4);
3023         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
3024         buf->Name[0] = 'R';
3025         buf->Name[1] = 'q';
3026         buf->Name[2] = 'L';
3027         buf->Name[3] = 's';
3028         return (char *)buf;
3029 }
3030
3031 static char *
3032 smb3_create_lease_buf(u8 *lease_key, u8 oplock)
3033 {
3034         struct create_lease_v2 *buf;
3035
3036         buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
3037         if (!buf)
3038                 return NULL;
3039
3040         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
3041         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
3042
3043         buf->ccontext.DataOffset = cpu_to_le16(offsetof
3044                                         (struct create_lease_v2, lcontext));
3045         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
3046         buf->ccontext.NameOffset = cpu_to_le16(offsetof
3047                                 (struct create_lease_v2, Name));
3048         buf->ccontext.NameLength = cpu_to_le16(4);
3049         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
3050         buf->Name[0] = 'R';
3051         buf->Name[1] = 'q';
3052         buf->Name[2] = 'L';
3053         buf->Name[3] = 's';
3054         return (char *)buf;
3055 }
3056
3057 static __u8
3058 smb2_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
3059 {
3060         struct create_lease *lc = (struct create_lease *)buf;
3061
3062         *epoch = 0; /* not used */
3063         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
3064                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
3065         return le32_to_cpu(lc->lcontext.LeaseState);
3066 }
3067
3068 static __u8
3069 smb3_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
3070 {
3071         struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
3072
3073         *epoch = le16_to_cpu(lc->lcontext.Epoch);
3074         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
3075                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
3076         if (lease_key)
3077                 memcpy(lease_key, &lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
3078         return le32_to_cpu(lc->lcontext.LeaseState);
3079 }
3080
3081 static unsigned int
3082 smb2_wp_retry_size(struct inode *inode)
3083 {
3084         return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
3085                      SMB2_MAX_BUFFER_SIZE);
3086 }
3087
3088 static bool
3089 smb2_dir_needs_close(struct cifsFileInfo *cfile)
3090 {
3091         return !cfile->invalidHandle;
3092 }
3093
3094 static void
3095 fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, unsigned int orig_len,
3096                    struct smb_rqst *old_rq)
3097 {
3098         struct smb2_sync_hdr *shdr =
3099                         (struct smb2_sync_hdr *)old_rq->rq_iov[0].iov_base;
3100
3101         memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
3102         tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
3103         tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
3104         tr_hdr->Flags = cpu_to_le16(0x01);
3105         get_random_bytes(&tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
3106         memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
3107 }
3108
3109 /* We can not use the normal sg_set_buf() as we will sometimes pass a
3110  * stack object as buf.
3111  */
3112 static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf,
3113                                    unsigned int buflen)
3114 {
3115         sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
3116 }
3117
3118 /* Assumes the first rqst has a transform header as the first iov.
3119  * I.e.
3120  * rqst[0].rq_iov[0]  is transform header
3121  * rqst[0].rq_iov[1+] data to be encrypted/decrypted
3122  * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
3123  */
3124 static struct scatterlist *
3125 init_sg(int num_rqst, struct smb_rqst *rqst, u8 *sign)
3126 {
3127         unsigned int sg_len;
3128         struct scatterlist *sg;
3129         unsigned int i;
3130         unsigned int j;
3131         unsigned int idx = 0;
3132         int skip;
3133
3134         sg_len = 1;
3135         for (i = 0; i < num_rqst; i++)
3136                 sg_len += rqst[i].rq_nvec + rqst[i].rq_npages;
3137
3138         sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
3139         if (!sg)
3140                 return NULL;
3141
3142         sg_init_table(sg, sg_len);
3143         for (i = 0; i < num_rqst; i++) {
3144                 for (j = 0; j < rqst[i].rq_nvec; j++) {
3145                         /*
3146                          * The first rqst has a transform header where the
3147                          * first 20 bytes are not part of the encrypted blob
3148                          */
3149                         skip = (i == 0) && (j == 0) ? 20 : 0;
3150                         smb2_sg_set_buf(&sg[idx++],
3151                                         rqst[i].rq_iov[j].iov_base + skip,
3152                                         rqst[i].rq_iov[j].iov_len - skip);
3153                         }
3154
3155                 for (j = 0; j < rqst[i].rq_npages; j++) {
3156                         unsigned int len, offset;
3157
3158                         rqst_page_get_length(&rqst[i], j, &len, &offset);
3159                         sg_set_page(&sg[idx++], rqst[i].rq_pages[j], len, offset);
3160                 }
3161         }
3162         smb2_sg_set_buf(&sg[idx], sign, SMB2_SIGNATURE_SIZE);
3163         return sg;
3164 }
3165
3166 static int
3167 smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
3168 {
3169         struct cifs_ses *ses;
3170         u8 *ses_enc_key;
3171
3172         spin_lock(&cifs_tcp_ses_lock);
3173         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3174                 if (ses->Suid != ses_id)
3175                         continue;
3176                 ses_enc_key = enc ? ses->smb3encryptionkey :
3177                                                         ses->smb3decryptionkey;
3178                 memcpy(key, ses_enc_key, SMB3_SIGN_KEY_SIZE);
3179                 spin_unlock(&cifs_tcp_ses_lock);
3180                 return 0;
3181         }
3182         spin_unlock(&cifs_tcp_ses_lock);
3183
3184         return 1;
3185 }
3186 /*
3187  * Encrypt or decrypt @rqst message. @rqst[0] has the following format:
3188  * iov[0]   - transform header (associate data),
3189  * iov[1-N] - SMB2 header and pages - data to encrypt.
3190  * On success return encrypted data in iov[1-N] and pages, leave iov[0]
3191  * untouched.
3192  */
3193 static int
3194 crypt_message(struct TCP_Server_Info *server, int num_rqst,
3195               struct smb_rqst *rqst, int enc)
3196 {
3197         struct smb2_transform_hdr *tr_hdr =
3198                 (struct smb2_transform_hdr *)rqst[0].rq_iov[0].iov_base;
3199         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
3200         int rc = 0;
3201         struct scatterlist *sg;
3202         u8 sign[SMB2_SIGNATURE_SIZE] = {};
3203         u8 key[SMB3_SIGN_KEY_SIZE];
3204         struct aead_request *req;
3205         char *iv;
3206         unsigned int iv_len;
3207         DECLARE_CRYPTO_WAIT(wait);
3208         struct crypto_aead *tfm;
3209         unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
3210
3211         rc = smb2_get_enc_key(server, tr_hdr->SessionId, enc, key);
3212         if (rc) {
3213                 cifs_dbg(VFS, "%s: Could not get %scryption key\n", __func__,
3214                          enc ? "en" : "de");
3215                 return 0;
3216         }
3217
3218         rc = smb3_crypto_aead_allocate(server);
3219         if (rc) {
3220                 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
3221                 return rc;
3222         }
3223
3224         tfm = enc ? server->secmech.ccmaesencrypt :
3225                                                 server->secmech.ccmaesdecrypt;
3226         rc = crypto_aead_setkey(tfm, key, SMB3_SIGN_KEY_SIZE);
3227         if (rc) {
3228                 cifs_dbg(VFS, "%s: Failed to set aead key %d\n", __func__, rc);
3229                 return rc;
3230         }
3231
3232         rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
3233         if (rc) {
3234                 cifs_dbg(VFS, "%s: Failed to set authsize %d\n", __func__, rc);
3235                 return rc;
3236         }
3237
3238         req = aead_request_alloc(tfm, GFP_KERNEL);
3239         if (!req) {
3240                 cifs_dbg(VFS, "%s: Failed to alloc aead request", __func__);
3241                 return -ENOMEM;
3242         }
3243
3244         if (!enc) {
3245                 memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
3246                 crypt_len += SMB2_SIGNATURE_SIZE;
3247         }
3248
3249         sg = init_sg(num_rqst, rqst, sign);
3250         if (!sg) {
3251                 cifs_dbg(VFS, "%s: Failed to init sg", __func__);
3252                 rc = -ENOMEM;
3253                 goto free_req;
3254         }
3255
3256         iv_len = crypto_aead_ivsize(tfm);
3257         iv = kzalloc(iv_len, GFP_KERNEL);
3258         if (!iv) {
3259                 cifs_dbg(VFS, "%s: Failed to alloc IV", __func__);
3260                 rc = -ENOMEM;
3261                 goto free_sg;
3262         }
3263         iv[0] = 3;
3264         memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
3265
3266         aead_request_set_crypt(req, sg, sg, crypt_len, iv);
3267         aead_request_set_ad(req, assoc_data_len);
3268
3269         aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
3270                                   crypto_req_done, &wait);
3271
3272         rc = crypto_wait_req(enc ? crypto_aead_encrypt(req)
3273                                 : crypto_aead_decrypt(req), &wait);
3274
3275         if (!rc && enc)
3276                 memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
3277
3278         kfree(iv);
3279 free_sg:
3280         kfree(sg);
3281 free_req:
3282         kfree(req);
3283         return rc;
3284 }
3285
3286 void
3287 smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst)
3288 {
3289         int i, j;
3290
3291         for (i = 0; i < num_rqst; i++) {
3292                 if (rqst[i].rq_pages) {
3293                         for (j = rqst[i].rq_npages - 1; j >= 0; j--)
3294                                 put_page(rqst[i].rq_pages[j]);
3295                         kfree(rqst[i].rq_pages);
3296                 }
3297         }
3298 }
3299
3300 /*
3301  * This function will initialize new_rq and encrypt the content.
3302  * The first entry, new_rq[0], only contains a single iov which contains
3303  * a smb2_transform_hdr and is pre-allocated by the caller.
3304  * This function then populates new_rq[1+] with the content from olq_rq[0+].
3305  *
3306  * The end result is an array of smb_rqst structures where the first structure
3307  * only contains a single iov for the transform header which we then can pass
3308  * to crypt_message().
3309  *
3310  * new_rq[0].rq_iov[0] :  smb2_transform_hdr pre-allocated by the caller
3311  * new_rq[1+].rq_iov[*] == old_rq[0+].rq_iov[*] : SMB2/3 requests
3312  */
3313 static int
3314 smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
3315                        struct smb_rqst *new_rq, struct smb_rqst *old_rq)
3316 {
3317         struct page **pages;
3318         struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
3319         unsigned int npages;
3320         unsigned int orig_len = 0;
3321         int i, j;
3322         int rc = -ENOMEM;
3323
3324         for (i = 1; i < num_rqst; i++) {
3325                 npages = old_rq[i - 1].rq_npages;
3326                 pages = kmalloc_array(npages, sizeof(struct page *),
3327                                       GFP_KERNEL);
3328                 if (!pages)
3329                         goto err_free;
3330
3331                 new_rq[i].rq_pages = pages;
3332                 new_rq[i].rq_npages = npages;
3333                 new_rq[i].rq_offset = old_rq[i - 1].rq_offset;
3334                 new_rq[i].rq_pagesz = old_rq[i - 1].rq_pagesz;
3335                 new_rq[i].rq_tailsz = old_rq[i - 1].rq_tailsz;
3336                 new_rq[i].rq_iov = old_rq[i - 1].rq_iov;
3337                 new_rq[i].rq_nvec = old_rq[i - 1].rq_nvec;
3338
3339                 orig_len += smb_rqst_len(server, &old_rq[i - 1]);
3340
3341                 for (j = 0; j < npages; j++) {
3342                         pages[j] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
3343                         if (!pages[j])
3344                                 goto err_free;
3345                 }
3346
3347                 /* copy pages form the old */
3348                 for (j = 0; j < npages; j++) {
3349                         char *dst, *src;
3350                         unsigned int offset, len;
3351
3352                         rqst_page_get_length(&new_rq[i], j, &len, &offset);
3353
3354                         dst = (char *) kmap(new_rq[i].rq_pages[j]) + offset;
3355                         src = (char *) kmap(old_rq[i - 1].rq_pages[j]) + offset;
3356
3357                         memcpy(dst, src, len);
3358                         kunmap(new_rq[i].rq_pages[j]);
3359                         kunmap(old_rq[i - 1].rq_pages[j]);
3360                 }
3361         }
3362
3363         /* fill the 1st iov with a transform header */
3364         fill_transform_hdr(tr_hdr, orig_len, old_rq);
3365
3366         rc = crypt_message(server, num_rqst, new_rq, 1);
3367         cifs_dbg(FYI, "encrypt message returned %d", rc);
3368         if (rc)
3369                 goto err_free;
3370
3371         return rc;
3372
3373 err_free:
3374         smb3_free_compound_rqst(num_rqst - 1, &new_rq[1]);
3375         return rc;
3376 }
3377
3378 static int
3379 smb3_is_transform_hdr(void *buf)
3380 {
3381         struct smb2_transform_hdr *trhdr = buf;
3382
3383         return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
3384 }
3385
3386 static int
3387 decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
3388                  unsigned int buf_data_size, struct page **pages,
3389                  unsigned int npages, unsigned int page_data_size)
3390 {
3391         struct kvec iov[2];
3392         struct smb_rqst rqst = {NULL};
3393         int rc;
3394
3395         iov[0].iov_base = buf;
3396         iov[0].iov_len = sizeof(struct smb2_transform_hdr);
3397         iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
3398         iov[1].iov_len = buf_data_size;
3399
3400         rqst.rq_iov = iov;
3401         rqst.rq_nvec = 2;
3402         rqst.rq_pages = pages;
3403         rqst.rq_npages = npages;
3404         rqst.rq_pagesz = PAGE_SIZE;
3405         rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
3406
3407         rc = crypt_message(server, 1, &rqst, 0);
3408         cifs_dbg(FYI, "decrypt message returned %d\n", rc);
3409
3410         if (rc)
3411                 return rc;
3412
3413         memmove(buf, iov[1].iov_base, buf_data_size);
3414
3415         server->total_read = buf_data_size + page_data_size;
3416
3417         return rc;
3418 }
3419
3420 static int
3421 read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
3422                      unsigned int npages, unsigned int len)
3423 {
3424         int i;
3425         int length;
3426
3427         for (i = 0; i < npages; i++) {
3428                 struct page *page = pages[i];
3429                 size_t n;
3430
3431                 n = len;
3432                 if (len >= PAGE_SIZE) {
3433                         /* enough data to fill the page */
3434                         n = PAGE_SIZE;
3435                         len -= n;
3436                 } else {
3437                         zero_user(page, len, PAGE_SIZE - len);
3438                         len = 0;
3439                 }
3440                 length = cifs_read_page_from_socket(server, page, 0, n);
3441                 if (length < 0)
3442                         return length;
3443                 server->total_read += length;
3444         }
3445
3446         return 0;
3447 }
3448
3449 static int
3450 init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
3451                unsigned int cur_off, struct bio_vec **page_vec)
3452 {
3453         struct bio_vec *bvec;
3454         int i;
3455
3456         bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
3457         if (!bvec)
3458                 return -ENOMEM;
3459
3460         for (i = 0; i < npages; i++) {
3461                 bvec[i].bv_page = pages[i];
3462                 bvec[i].bv_offset = (i == 0) ? cur_off : 0;
3463                 bvec[i].bv_len = min_t(unsigned int, PAGE_SIZE, data_size);
3464                 data_size -= bvec[i].bv_len;
3465         }
3466
3467         if (data_size != 0) {
3468                 cifs_dbg(VFS, "%s: something went wrong\n", __func__);
3469                 kfree(bvec);
3470                 return -EIO;
3471         }
3472
3473         *page_vec = bvec;
3474         return 0;
3475 }
3476
3477 static int
3478 handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
3479                  char *buf, unsigned int buf_len, struct page **pages,
3480                  unsigned int npages, unsigned int page_data_size)
3481 {
3482         unsigned int data_offset;
3483         unsigned int data_len;
3484         unsigned int cur_off;
3485         unsigned int cur_page_idx;
3486         unsigned int pad_len;
3487         struct cifs_readdata *rdata = mid->callback_data;
3488         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
3489         struct bio_vec *bvec = NULL;
3490         struct iov_iter iter;
3491         struct kvec iov;
3492         int length;
3493         bool use_rdma_mr = false;
3494
3495         if (shdr->Command != SMB2_READ) {
3496                 cifs_dbg(VFS, "only big read responses are supported\n");
3497                 return -ENOTSUPP;
3498         }
3499
3500         if (server->ops->is_session_expired &&
3501             server->ops->is_session_expired(buf)) {
3502                 cifs_reconnect(server);
3503                 wake_up(&server->response_q);
3504                 return -1;
3505         }
3506
3507         if (server->ops->is_status_pending &&
3508                         server->ops->is_status_pending(buf, server))
3509                 return -1;
3510
3511         /* set up first two iov to get credits */
3512         rdata->iov[0].iov_base = buf;
3513         rdata->iov[0].iov_len = 0;
3514         rdata->iov[1].iov_base = buf;
3515         rdata->iov[1].iov_len =
3516                 min_t(unsigned int, buf_len, server->vals->read_rsp_size);
3517         cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
3518                  rdata->iov[0].iov_base, rdata->iov[0].iov_len);
3519         cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
3520                  rdata->iov[1].iov_base, rdata->iov[1].iov_len);
3521
3522         rdata->result = server->ops->map_error(buf, true);
3523         if (rdata->result != 0) {
3524                 cifs_dbg(FYI, "%s: server returned error %d\n",
3525                          __func__, rdata->result);
3526                 /* normal error on read response */
3527                 dequeue_mid(mid, false);
3528                 return 0;
3529         }
3530
3531         data_offset = server->ops->read_data_offset(buf);
3532 #ifdef CONFIG_CIFS_SMB_DIRECT
3533         use_rdma_mr = rdata->mr;
3534 #endif
3535         data_len = server->ops->read_data_length(buf, use_rdma_mr);
3536
3537         if (data_offset < server->vals->read_rsp_size) {
3538                 /*
3539                  * win2k8 sometimes sends an offset of 0 when the read
3540                  * is beyond the EOF. Treat it as if the data starts just after
3541                  * the header.
3542                  */
3543                 cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
3544                          __func__, data_offset);
3545                 data_offset = server->vals->read_rsp_size;
3546         } else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
3547                 /* data_offset is beyond the end of smallbuf */
3548                 cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
3549                          __func__, data_offset);
3550                 rdata->result = -EIO;
3551                 dequeue_mid(mid, rdata->result);
3552                 return 0;
3553         }
3554
3555         pad_len = data_offset - server->vals->read_rsp_size;
3556
3557         if (buf_len <= data_offset) {
3558                 /* read response payload is in pages */
3559                 cur_page_idx = pad_len / PAGE_SIZE;
3560                 cur_off = pad_len % PAGE_SIZE;
3561
3562                 if (cur_page_idx != 0) {
3563                         /* data offset is beyond the 1st page of response */
3564                         cifs_dbg(FYI, "%s: data offset (%u) beyond 1st page of response\n",
3565                                  __func__, data_offset);
3566                         rdata->result = -EIO;
3567                         dequeue_mid(mid, rdata->result);
3568                         return 0;
3569                 }
3570
3571                 if (data_len > page_data_size - pad_len) {
3572                         /* data_len is corrupt -- discard frame */
3573                         rdata->result = -EIO;
3574                         dequeue_mid(mid, rdata->result);
3575                         return 0;
3576                 }
3577
3578                 rdata->result = init_read_bvec(pages, npages, page_data_size,
3579                                                cur_off, &bvec);
3580                 if (rdata->result != 0) {
3581                         dequeue_mid(mid, rdata->result);
3582                         return 0;
3583                 }
3584
3585                 iov_iter_bvec(&iter, WRITE, bvec, npages, data_len);
3586         } else if (buf_len >= data_offset + data_len) {
3587                 /* read response payload is in buf */
3588                 WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
3589                 iov.iov_base = buf + data_offset;
3590                 iov.iov_len = data_len;
3591                 iov_iter_kvec(&iter, WRITE, &iov, 1, data_len);
3592         } else {
3593                 /* read response payload cannot be in both buf and pages */
3594                 WARN_ONCE(1, "buf can not contain only a part of read data");
3595                 rdata->result = -EIO;
3596                 dequeue_mid(mid, rdata->result);
3597                 return 0;
3598         }
3599
3600         length = rdata->copy_into_pages(server, rdata, &iter);
3601
3602         kfree(bvec);
3603
3604         if (length < 0)
3605                 return length;
3606
3607         dequeue_mid(mid, false);
3608         return length;
3609 }
3610
3611 static int
3612 receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid)
3613 {
3614         char *buf = server->smallbuf;
3615         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
3616         unsigned int npages;
3617         struct page **pages;
3618         unsigned int len;
3619         unsigned int buflen = server->pdu_size;
3620         int rc;
3621         int i = 0;
3622
3623         len = min_t(unsigned int, buflen, server->vals->read_rsp_size +
3624                 sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
3625
3626         rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
3627         if (rc < 0)
3628                 return rc;
3629         server->total_read += rc;
3630
3631         len = le32_to_cpu(tr_hdr->OriginalMessageSize) -
3632                 server->vals->read_rsp_size;
3633         npages = DIV_ROUND_UP(len, PAGE_SIZE);
3634
3635         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
3636         if (!pages) {
3637                 rc = -ENOMEM;
3638                 goto discard_data;
3639         }
3640
3641         for (; i < npages; i++) {
3642                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
3643                 if (!pages[i]) {
3644                         rc = -ENOMEM;
3645                         goto discard_data;
3646                 }
3647         }
3648
3649         /* read read data into pages */
3650         rc = read_data_into_pages(server, pages, npages, len);
3651         if (rc)
3652                 goto free_pages;
3653
3654         rc = cifs_discard_remaining_data(server);
3655         if (rc)
3656                 goto free_pages;
3657
3658         rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size,
3659                               pages, npages, len);
3660         if (rc)
3661                 goto free_pages;
3662
3663         *mid = smb2_find_mid(server, buf);
3664         if (*mid == NULL)
3665                 cifs_dbg(FYI, "mid not found\n");
3666         else {
3667                 cifs_dbg(FYI, "mid found\n");
3668                 (*mid)->decrypted = true;
3669                 rc = handle_read_data(server, *mid, buf,
3670                                       server->vals->read_rsp_size,
3671                                       pages, npages, len);
3672         }
3673
3674 free_pages:
3675         for (i = i - 1; i >= 0; i--)
3676                 put_page(pages[i]);
3677         kfree(pages);
3678         return rc;
3679 discard_data:
3680         cifs_discard_remaining_data(server);
3681         goto free_pages;
3682 }
3683
3684 static int
3685 receive_encrypted_standard(struct TCP_Server_Info *server,
3686                            struct mid_q_entry **mids, char **bufs,
3687                            int *num_mids)
3688 {
3689         int ret, length;
3690         char *buf = server->smallbuf;
3691         char *tmpbuf;
3692         struct smb2_sync_hdr *shdr;
3693         unsigned int pdu_length = server->pdu_size;
3694         unsigned int buf_size;
3695         struct mid_q_entry *mid_entry;
3696         int next_is_large;
3697         char *next_buffer = NULL;
3698
3699         *num_mids = 0;
3700
3701         /* switch to large buffer if too big for a small one */
3702         if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE) {
3703                 server->large_buf = true;
3704                 memcpy(server->bigbuf, buf, server->total_read);
3705                 buf = server->bigbuf;
3706         }
3707
3708         /* now read the rest */
3709         length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
3710                                 pdu_length - HEADER_SIZE(server) + 1);
3711         if (length < 0)
3712                 return length;
3713         server->total_read += length;
3714
3715         buf_size = pdu_length - sizeof(struct smb2_transform_hdr);
3716         length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0);
3717         if (length)
3718                 return length;
3719
3720         next_is_large = server->large_buf;
3721  one_more:
3722         shdr = (struct smb2_sync_hdr *)buf;
3723         if (shdr->NextCommand) {
3724                 if (next_is_large) {
3725                         tmpbuf = server->bigbuf;
3726                         next_buffer = (char *)cifs_buf_get();
3727                 } else {
3728                         tmpbuf = server->smallbuf;
3729                         next_buffer = (char *)cifs_small_buf_get();
3730                 }
3731                 memcpy(next_buffer,
3732                        tmpbuf + le32_to_cpu(shdr->NextCommand),
3733                        pdu_length - le32_to_cpu(shdr->NextCommand));
3734         }
3735
3736         mid_entry = smb2_find_mid(server, buf);
3737         if (mid_entry == NULL)
3738                 cifs_dbg(FYI, "mid not found\n");
3739         else {
3740                 cifs_dbg(FYI, "mid found\n");
3741                 mid_entry->decrypted = true;
3742                 mid_entry->resp_buf_size = server->pdu_size;
3743         }
3744
3745         if (*num_mids >= MAX_COMPOUND) {
3746                 cifs_dbg(VFS, "too many PDUs in compound\n");
3747                 return -1;
3748         }
3749         bufs[*num_mids] = buf;
3750         mids[(*num_mids)++] = mid_entry;
3751
3752         if (mid_entry && mid_entry->handle)
3753                 ret = mid_entry->handle(server, mid_entry);
3754         else
3755                 ret = cifs_handle_standard(server, mid_entry);
3756
3757         if (ret == 0 && shdr->NextCommand) {
3758                 pdu_length -= le32_to_cpu(shdr->NextCommand);
3759                 server->large_buf = next_is_large;
3760                 if (next_is_large)
3761                         server->bigbuf = next_buffer;
3762                 else
3763                         server->smallbuf = next_buffer;
3764
3765                 buf += le32_to_cpu(shdr->NextCommand);
3766                 goto one_more;
3767         }
3768
3769         return ret;
3770 }
3771
3772 static int
3773 smb3_receive_transform(struct TCP_Server_Info *server,
3774                        struct mid_q_entry **mids, char **bufs, int *num_mids)
3775 {
3776         char *buf = server->smallbuf;
3777         unsigned int pdu_length = server->pdu_size;
3778         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
3779         unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
3780
3781         if (pdu_length < sizeof(struct smb2_transform_hdr) +
3782                                                 sizeof(struct smb2_sync_hdr)) {
3783                 cifs_dbg(VFS, "Transform message is too small (%u)\n",
3784                          pdu_length);
3785                 cifs_reconnect(server);
3786                 wake_up(&server->response_q);
3787                 return -ECONNABORTED;
3788         }
3789
3790         if (pdu_length < orig_len + sizeof(struct smb2_transform_hdr)) {
3791                 cifs_dbg(VFS, "Transform message is broken\n");
3792                 cifs_reconnect(server);
3793                 wake_up(&server->response_q);
3794                 return -ECONNABORTED;
3795         }
3796
3797         /* TODO: add support for compounds containing READ. */
3798         if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server)) {
3799                 *num_mids = 1;
3800                 return receive_encrypted_read(server, &mids[0]);
3801         }
3802
3803         return receive_encrypted_standard(server, mids, bufs, num_mids);
3804 }
3805
3806 int
3807 smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
3808 {
3809         char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
3810
3811         return handle_read_data(server, mid, buf, server->pdu_size,
3812                                 NULL, 0, 0);
3813 }
3814
3815 static int
3816 smb2_next_header(char *buf)
3817 {
3818         struct smb2_sync_hdr *hdr = (struct smb2_sync_hdr *)buf;
3819         struct smb2_transform_hdr *t_hdr = (struct smb2_transform_hdr *)buf;
3820
3821         if (hdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM)
3822                 return sizeof(struct smb2_transform_hdr) +
3823                   le32_to_cpu(t_hdr->OriginalMessageSize);
3824
3825         return le32_to_cpu(hdr->NextCommand);
3826 }
3827
3828 static int
3829 smb2_make_node(unsigned int xid, struct inode *inode,
3830                struct dentry *dentry, struct cifs_tcon *tcon,
3831                char *full_path, umode_t mode, dev_t dev)
3832 {
3833         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
3834         int rc = -EPERM;
3835         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
3836         FILE_ALL_INFO *buf = NULL;
3837         struct cifs_io_parms io_parms;
3838         __u32 oplock = 0;
3839         struct cifs_fid fid;
3840         struct cifs_open_parms oparms;
3841         unsigned int bytes_written;
3842         struct win_dev *pdev;
3843         struct kvec iov[2];
3844
3845         /*
3846          * Check if mounted with mount parm 'sfu' mount parm.
3847          * SFU emulation should work with all servers, but only
3848          * supports block and char device (no socket & fifo),
3849          * and was used by default in earlier versions of Windows
3850          */
3851         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
3852                 goto out;
3853
3854         /*
3855          * TODO: Add ability to create instead via reparse point. Windows (e.g.
3856          * their current NFS server) uses this approach to expose special files
3857          * over SMB2/SMB3 and Samba will do this with SMB3.1.1 POSIX Extensions
3858          */
3859
3860         if (!S_ISCHR(mode) && !S_ISBLK(mode))
3861                 goto out;
3862
3863         cifs_dbg(FYI, "sfu compat create special file\n");
3864
3865         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
3866         if (buf == NULL) {
3867                 rc = -ENOMEM;
3868                 goto out;
3869         }
3870
3871         if (backup_cred(cifs_sb))
3872                 create_options |= CREATE_OPEN_BACKUP_INTENT;
3873
3874         oparms.tcon = tcon;
3875         oparms.cifs_sb = cifs_sb;
3876         oparms.desired_access = GENERIC_WRITE;
3877         oparms.create_options = create_options;
3878         oparms.disposition = FILE_CREATE;
3879         oparms.path = full_path;
3880         oparms.fid = &fid;
3881         oparms.reconnect = false;
3882
3883         if (tcon->ses->server->oplocks)
3884                 oplock = REQ_OPLOCK;
3885         else
3886                 oplock = 0;
3887         rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
3888         if (rc)
3889                 goto out;
3890
3891         /*
3892          * BB Do not bother to decode buf since no local inode yet to put
3893          * timestamps in, but we can reuse it safely.
3894          */
3895
3896         pdev = (struct win_dev *)buf;
3897         io_parms.pid = current->tgid;
3898         io_parms.tcon = tcon;
3899         io_parms.offset = 0;
3900         io_parms.length = sizeof(struct win_dev);
3901         iov[1].iov_base = buf;
3902         iov[1].iov_len = sizeof(struct win_dev);
3903         if (S_ISCHR(mode)) {
3904                 memcpy(pdev->type, "IntxCHR", 8);
3905                 pdev->major = cpu_to_le64(MAJOR(dev));
3906                 pdev->minor = cpu_to_le64(MINOR(dev));
3907                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
3908                                                         &bytes_written, iov, 1);
3909         } else if (S_ISBLK(mode)) {
3910                 memcpy(pdev->type, "IntxBLK", 8);
3911                 pdev->major = cpu_to_le64(MAJOR(dev));
3912                 pdev->minor = cpu_to_le64(MINOR(dev));
3913                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
3914                                                         &bytes_written, iov, 1);
3915         }
3916         tcon->ses->server->ops->close(xid, tcon, &fid);
3917         d_drop(dentry);
3918
3919         /* FIXME: add code here to set EAs */
3920 out:
3921         kfree(buf);
3922         return rc;
3923 }
3924
3925
3926 struct smb_version_operations smb20_operations = {
3927         .compare_fids = smb2_compare_fids,
3928         .setup_request = smb2_setup_request,
3929         .setup_async_request = smb2_setup_async_request,
3930         .check_receive = smb2_check_receive,
3931         .add_credits = smb2_add_credits,
3932         .set_credits = smb2_set_credits,
3933         .get_credits_field = smb2_get_credits_field,
3934         .get_credits = smb2_get_credits,
3935         .wait_mtu_credits = cifs_wait_mtu_credits,
3936         .get_next_mid = smb2_get_next_mid,
3937         .revert_current_mid = smb2_revert_current_mid,
3938         .read_data_offset = smb2_read_data_offset,
3939         .read_data_length = smb2_read_data_length,
3940         .map_error = map_smb2_to_linux_error,
3941         .find_mid = smb2_find_mid,
3942         .check_message = smb2_check_message,
3943         .dump_detail = smb2_dump_detail,
3944         .clear_stats = smb2_clear_stats,
3945         .print_stats = smb2_print_stats,
3946         .is_oplock_break = smb2_is_valid_oplock_break,
3947         .handle_cancelled_mid = smb2_handle_cancelled_mid,
3948         .downgrade_oplock = smb2_downgrade_oplock,
3949         .need_neg = smb2_need_neg,
3950         .negotiate = smb2_negotiate,
3951         .negotiate_wsize = smb2_negotiate_wsize,
3952         .negotiate_rsize = smb2_negotiate_rsize,
3953         .sess_setup = SMB2_sess_setup,
3954         .logoff = SMB2_logoff,
3955         .tree_connect = SMB2_tcon,
3956         .tree_disconnect = SMB2_tdis,
3957         .qfs_tcon = smb2_qfs_tcon,
3958         .is_path_accessible = smb2_is_path_accessible,
3959         .can_echo = smb2_can_echo,
3960         .echo = SMB2_echo,
3961         .query_path_info = smb2_query_path_info,
3962         .get_srv_inum = smb2_get_srv_inum,
3963         .query_file_info = smb2_query_file_info,
3964         .set_path_size = smb2_set_path_size,
3965         .set_file_size = smb2_set_file_size,
3966         .set_file_info = smb2_set_file_info,
3967         .set_compression = smb2_set_compression,
3968         .mkdir = smb2_mkdir,
3969         .mkdir_setinfo = smb2_mkdir_setinfo,
3970         .rmdir = smb2_rmdir,
3971         .unlink = smb2_unlink,
3972         .rename = smb2_rename_path,
3973         .create_hardlink = smb2_create_hardlink,
3974         .query_symlink = smb2_query_symlink,
3975         .query_mf_symlink = smb3_query_mf_symlink,
3976         .create_mf_symlink = smb3_create_mf_symlink,
3977         .open = smb2_open_file,
3978         .set_fid = smb2_set_fid,
3979         .close = smb2_close_file,
3980         .flush = smb2_flush_file,
3981         .async_readv = smb2_async_readv,
3982         .async_writev = smb2_async_writev,
3983         .sync_read = smb2_sync_read,
3984         .sync_write = smb2_sync_write,
3985         .query_dir_first = smb2_query_dir_first,
3986         .query_dir_next = smb2_query_dir_next,
3987         .close_dir = smb2_close_dir,
3988         .calc_smb_size = smb2_calc_size,
3989         .is_status_pending = smb2_is_status_pending,
3990         .is_session_expired = smb2_is_session_expired,
3991         .oplock_response = smb2_oplock_response,
3992         .queryfs = smb2_queryfs,
3993         .mand_lock = smb2_mand_lock,
3994         .mand_unlock_range = smb2_unlock_range,
3995         .push_mand_locks = smb2_push_mandatory_locks,
3996         .get_lease_key = smb2_get_lease_key,
3997         .set_lease_key = smb2_set_lease_key,
3998         .new_lease_key = smb2_new_lease_key,
3999         .calc_signature = smb2_calc_signature,
4000         .is_read_op = smb2_is_read_op,
4001         .set_oplock_level = smb2_set_oplock_level,
4002         .create_lease_buf = smb2_create_lease_buf,
4003         .parse_lease_buf = smb2_parse_lease_buf,
4004         .copychunk_range = smb2_copychunk_range,
4005         .wp_retry_size = smb2_wp_retry_size,
4006         .dir_needs_close = smb2_dir_needs_close,
4007         .get_dfs_refer = smb2_get_dfs_refer,
4008         .select_sectype = smb2_select_sectype,
4009 #ifdef CONFIG_CIFS_XATTR
4010         .query_all_EAs = smb2_query_eas,
4011         .set_EA = smb2_set_ea,
4012 #endif /* CIFS_XATTR */
4013 #ifdef CONFIG_CIFS_ACL
4014         .get_acl = get_smb2_acl,
4015         .get_acl_by_fid = get_smb2_acl_by_fid,
4016         .set_acl = set_smb2_acl,
4017 #endif /* CIFS_ACL */
4018         .next_header = smb2_next_header,
4019         .ioctl_query_info = smb2_ioctl_query_info,
4020         .make_node = smb2_make_node,
4021 };
4022
4023 struct smb_version_operations smb21_operations = {
4024         .compare_fids = smb2_compare_fids,
4025         .setup_request = smb2_setup_request,
4026         .setup_async_request = smb2_setup_async_request,
4027         .check_receive = smb2_check_receive,
4028         .add_credits = smb2_add_credits,
4029         .set_credits = smb2_set_credits,
4030         .get_credits_field = smb2_get_credits_field,
4031         .get_credits = smb2_get_credits,
4032         .wait_mtu_credits = smb2_wait_mtu_credits,
4033         .adjust_credits = smb2_adjust_credits,
4034         .get_next_mid = smb2_get_next_mid,
4035         .revert_current_mid = smb2_revert_current_mid,
4036         .read_data_offset = smb2_read_data_offset,
4037         .read_data_length = smb2_read_data_length,
4038         .map_error = map_smb2_to_linux_error,
4039         .find_mid = smb2_find_mid,
4040         .check_message = smb2_check_message,
4041         .dump_detail = smb2_dump_detail,
4042         .clear_stats = smb2_clear_stats,
4043         .print_stats = smb2_print_stats,
4044         .is_oplock_break = smb2_is_valid_oplock_break,
4045         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4046         .downgrade_oplock = smb21_downgrade_oplock,
4047         .need_neg = smb2_need_neg,
4048         .negotiate = smb2_negotiate,
4049         .negotiate_wsize = smb2_negotiate_wsize,
4050         .negotiate_rsize = smb2_negotiate_rsize,
4051         .sess_setup = SMB2_sess_setup,
4052         .logoff = SMB2_logoff,
4053         .tree_connect = SMB2_tcon,
4054         .tree_disconnect = SMB2_tdis,
4055         .qfs_tcon = smb2_qfs_tcon,
4056         .is_path_accessible = smb2_is_path_accessible,
4057         .can_echo = smb2_can_echo,
4058         .echo = SMB2_echo,
4059         .query_path_info = smb2_query_path_info,
4060         .get_srv_inum = smb2_get_srv_inum,
4061         .query_file_info = smb2_query_file_info,
4062         .set_path_size = smb2_set_path_size,
4063         .set_file_size = smb2_set_file_size,
4064         .set_file_info = smb2_set_file_info,
4065         .set_compression = smb2_set_compression,
4066         .mkdir = smb2_mkdir,
4067         .mkdir_setinfo = smb2_mkdir_setinfo,
4068         .rmdir = smb2_rmdir,
4069         .unlink = smb2_unlink,
4070         .rename = smb2_rename_path,
4071         .create_hardlink = smb2_create_hardlink,
4072         .query_symlink = smb2_query_symlink,
4073         .query_mf_symlink = smb3_query_mf_symlink,
4074         .create_mf_symlink = smb3_create_mf_symlink,
4075         .open = smb2_open_file,
4076         .set_fid = smb2_set_fid,
4077         .close = smb2_close_file,
4078         .flush = smb2_flush_file,
4079         .async_readv = smb2_async_readv,
4080         .async_writev = smb2_async_writev,
4081         .sync_read = smb2_sync_read,
4082         .sync_write = smb2_sync_write,
4083         .query_dir_first = smb2_query_dir_first,
4084         .query_dir_next = smb2_query_dir_next,
4085         .close_dir = smb2_close_dir,
4086         .calc_smb_size = smb2_calc_size,
4087         .is_status_pending = smb2_is_status_pending,
4088         .is_session_expired = smb2_is_session_expired,
4089         .oplock_response = smb2_oplock_response,
4090         .queryfs = smb2_queryfs,
4091         .mand_lock = smb2_mand_lock,
4092         .mand_unlock_range = smb2_unlock_range,
4093         .push_mand_locks = smb2_push_mandatory_locks,
4094         .get_lease_key = smb2_get_lease_key,
4095         .set_lease_key = smb2_set_lease_key,
4096         .new_lease_key = smb2_new_lease_key,
4097         .calc_signature = smb2_calc_signature,
4098         .is_read_op = smb21_is_read_op,
4099         .set_oplock_level = smb21_set_oplock_level,
4100         .create_lease_buf = smb2_create_lease_buf,
4101         .parse_lease_buf = smb2_parse_lease_buf,
4102         .copychunk_range = smb2_copychunk_range,
4103         .wp_retry_size = smb2_wp_retry_size,
4104         .dir_needs_close = smb2_dir_needs_close,
4105         .enum_snapshots = smb3_enum_snapshots,
4106         .get_dfs_refer = smb2_get_dfs_refer,
4107         .select_sectype = smb2_select_sectype,
4108 #ifdef CONFIG_CIFS_XATTR
4109         .query_all_EAs = smb2_query_eas,
4110         .set_EA = smb2_set_ea,
4111 #endif /* CIFS_XATTR */
4112 #ifdef CONFIG_CIFS_ACL
4113         .get_acl = get_smb2_acl,
4114         .get_acl_by_fid = get_smb2_acl_by_fid,
4115         .set_acl = set_smb2_acl,
4116 #endif /* CIFS_ACL */
4117         .next_header = smb2_next_header,
4118         .ioctl_query_info = smb2_ioctl_query_info,
4119         .make_node = smb2_make_node,
4120 };
4121
4122 struct smb_version_operations smb30_operations = {
4123         .compare_fids = smb2_compare_fids,
4124         .setup_request = smb2_setup_request,
4125         .setup_async_request = smb2_setup_async_request,
4126         .check_receive = smb2_check_receive,
4127         .add_credits = smb2_add_credits,
4128         .set_credits = smb2_set_credits,
4129         .get_credits_field = smb2_get_credits_field,
4130         .get_credits = smb2_get_credits,
4131         .wait_mtu_credits = smb2_wait_mtu_credits,
4132         .adjust_credits = smb2_adjust_credits,
4133         .get_next_mid = smb2_get_next_mid,
4134         .revert_current_mid = smb2_revert_current_mid,
4135         .read_data_offset = smb2_read_data_offset,
4136         .read_data_length = smb2_read_data_length,
4137         .map_error = map_smb2_to_linux_error,
4138         .find_mid = smb2_find_mid,
4139         .check_message = smb2_check_message,
4140         .dump_detail = smb2_dump_detail,
4141         .clear_stats = smb2_clear_stats,
4142         .print_stats = smb2_print_stats,
4143         .dump_share_caps = smb2_dump_share_caps,
4144         .is_oplock_break = smb2_is_valid_oplock_break,
4145         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4146         .downgrade_oplock = smb21_downgrade_oplock,
4147         .need_neg = smb2_need_neg,
4148         .negotiate = smb2_negotiate,
4149         .negotiate_wsize = smb3_negotiate_wsize,
4150         .negotiate_rsize = smb3_negotiate_rsize,
4151         .sess_setup = SMB2_sess_setup,
4152         .logoff = SMB2_logoff,
4153         .tree_connect = SMB2_tcon,
4154         .tree_disconnect = SMB2_tdis,
4155         .qfs_tcon = smb3_qfs_tcon,
4156         .is_path_accessible = smb2_is_path_accessible,
4157         .can_echo = smb2_can_echo,
4158         .echo = SMB2_echo,
4159         .query_path_info = smb2_query_path_info,
4160         .get_srv_inum = smb2_get_srv_inum,
4161         .query_file_info = smb2_query_file_info,
4162         .set_path_size = smb2_set_path_size,
4163         .set_file_size = smb2_set_file_size,
4164         .set_file_info = smb2_set_file_info,
4165         .set_compression = smb2_set_compression,
4166         .mkdir = smb2_mkdir,
4167         .mkdir_setinfo = smb2_mkdir_setinfo,
4168         .rmdir = smb2_rmdir,
4169         .unlink = smb2_unlink,
4170         .rename = smb2_rename_path,
4171         .create_hardlink = smb2_create_hardlink,
4172         .query_symlink = smb2_query_symlink,
4173         .query_mf_symlink = smb3_query_mf_symlink,
4174         .create_mf_symlink = smb3_create_mf_symlink,
4175         .open = smb2_open_file,
4176         .set_fid = smb2_set_fid,
4177         .close = smb2_close_file,
4178         .flush = smb2_flush_file,
4179         .async_readv = smb2_async_readv,
4180         .async_writev = smb2_async_writev,
4181         .sync_read = smb2_sync_read,
4182         .sync_write = smb2_sync_write,
4183         .query_dir_first = smb2_query_dir_first,
4184         .query_dir_next = smb2_query_dir_next,
4185         .close_dir = smb2_close_dir,
4186         .calc_smb_size = smb2_calc_size,
4187         .is_status_pending = smb2_is_status_pending,
4188         .is_session_expired = smb2_is_session_expired,
4189         .oplock_response = smb2_oplock_response,
4190         .queryfs = smb2_queryfs,
4191         .mand_lock = smb2_mand_lock,
4192         .mand_unlock_range = smb2_unlock_range,
4193         .push_mand_locks = smb2_push_mandatory_locks,
4194         .get_lease_key = smb2_get_lease_key,
4195         .set_lease_key = smb2_set_lease_key,
4196         .new_lease_key = smb2_new_lease_key,
4197         .generate_signingkey = generate_smb30signingkey,
4198         .calc_signature = smb3_calc_signature,
4199         .set_integrity  = smb3_set_integrity,
4200         .is_read_op = smb21_is_read_op,
4201         .set_oplock_level = smb3_set_oplock_level,
4202         .create_lease_buf = smb3_create_lease_buf,
4203         .parse_lease_buf = smb3_parse_lease_buf,
4204         .copychunk_range = smb2_copychunk_range,
4205         .duplicate_extents = smb2_duplicate_extents,
4206         .validate_negotiate = smb3_validate_negotiate,
4207         .wp_retry_size = smb2_wp_retry_size,
4208         .dir_needs_close = smb2_dir_needs_close,
4209         .fallocate = smb3_fallocate,
4210         .enum_snapshots = smb3_enum_snapshots,
4211         .init_transform_rq = smb3_init_transform_rq,
4212         .is_transform_hdr = smb3_is_transform_hdr,
4213         .receive_transform = smb3_receive_transform,
4214         .get_dfs_refer = smb2_get_dfs_refer,
4215         .select_sectype = smb2_select_sectype,
4216 #ifdef CONFIG_CIFS_XATTR
4217         .query_all_EAs = smb2_query_eas,
4218         .set_EA = smb2_set_ea,
4219 #endif /* CIFS_XATTR */
4220 #ifdef CONFIG_CIFS_ACL
4221         .get_acl = get_smb2_acl,
4222         .get_acl_by_fid = get_smb2_acl_by_fid,
4223         .set_acl = set_smb2_acl,
4224 #endif /* CIFS_ACL */
4225         .next_header = smb2_next_header,
4226         .ioctl_query_info = smb2_ioctl_query_info,
4227         .make_node = smb2_make_node,
4228 };
4229
4230 struct smb_version_operations smb311_operations = {
4231         .compare_fids = smb2_compare_fids,
4232         .setup_request = smb2_setup_request,
4233         .setup_async_request = smb2_setup_async_request,
4234         .check_receive = smb2_check_receive,
4235         .add_credits = smb2_add_credits,
4236         .set_credits = smb2_set_credits,
4237         .get_credits_field = smb2_get_credits_field,
4238         .get_credits = smb2_get_credits,
4239         .wait_mtu_credits = smb2_wait_mtu_credits,
4240         .adjust_credits = smb2_adjust_credits,
4241         .get_next_mid = smb2_get_next_mid,
4242         .revert_current_mid = smb2_revert_current_mid,
4243         .read_data_offset = smb2_read_data_offset,
4244         .read_data_length = smb2_read_data_length,
4245         .map_error = map_smb2_to_linux_error,
4246         .find_mid = smb2_find_mid,
4247         .check_message = smb2_check_message,
4248         .dump_detail = smb2_dump_detail,
4249         .clear_stats = smb2_clear_stats,
4250         .print_stats = smb2_print_stats,
4251         .dump_share_caps = smb2_dump_share_caps,
4252         .is_oplock_break = smb2_is_valid_oplock_break,
4253         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4254         .downgrade_oplock = smb21_downgrade_oplock,
4255         .need_neg = smb2_need_neg,
4256         .negotiate = smb2_negotiate,
4257         .negotiate_wsize = smb3_negotiate_wsize,
4258         .negotiate_rsize = smb3_negotiate_rsize,
4259         .sess_setup = SMB2_sess_setup,
4260         .logoff = SMB2_logoff,
4261         .tree_connect = SMB2_tcon,
4262         .tree_disconnect = SMB2_tdis,
4263         .qfs_tcon = smb3_qfs_tcon,
4264         .is_path_accessible = smb2_is_path_accessible,
4265         .can_echo = smb2_can_echo,
4266         .echo = SMB2_echo,
4267         .query_path_info = smb2_query_path_info,
4268         .get_srv_inum = smb2_get_srv_inum,
4269         .query_file_info = smb2_query_file_info,
4270         .set_path_size = smb2_set_path_size,
4271         .set_file_size = smb2_set_file_size,
4272         .set_file_info = smb2_set_file_info,
4273         .set_compression = smb2_set_compression,
4274         .mkdir = smb2_mkdir,
4275         .mkdir_setinfo = smb2_mkdir_setinfo,
4276         .posix_mkdir = smb311_posix_mkdir,
4277         .rmdir = smb2_rmdir,
4278         .unlink = smb2_unlink,
4279         .rename = smb2_rename_path,
4280         .create_hardlink = smb2_create_hardlink,
4281         .query_symlink = smb2_query_symlink,
4282         .query_mf_symlink = smb3_query_mf_symlink,
4283         .create_mf_symlink = smb3_create_mf_symlink,
4284         .open = smb2_open_file,
4285         .set_fid = smb2_set_fid,
4286         .close = smb2_close_file,
4287         .flush = smb2_flush_file,
4288         .async_readv = smb2_async_readv,
4289         .async_writev = smb2_async_writev,
4290         .sync_read = smb2_sync_read,
4291         .sync_write = smb2_sync_write,
4292         .query_dir_first = smb2_query_dir_first,
4293         .query_dir_next = smb2_query_dir_next,
4294         .close_dir = smb2_close_dir,
4295         .calc_smb_size = smb2_calc_size,
4296         .is_status_pending = smb2_is_status_pending,
4297         .is_session_expired = smb2_is_session_expired,
4298         .oplock_response = smb2_oplock_response,
4299         .queryfs = smb311_queryfs,
4300         .mand_lock = smb2_mand_lock,
4301         .mand_unlock_range = smb2_unlock_range,
4302         .push_mand_locks = smb2_push_mandatory_locks,
4303         .get_lease_key = smb2_get_lease_key,
4304         .set_lease_key = smb2_set_lease_key,
4305         .new_lease_key = smb2_new_lease_key,
4306         .generate_signingkey = generate_smb311signingkey,
4307         .calc_signature = smb3_calc_signature,
4308         .set_integrity  = smb3_set_integrity,
4309         .is_read_op = smb21_is_read_op,
4310         .set_oplock_level = smb3_set_oplock_level,
4311         .create_lease_buf = smb3_create_lease_buf,
4312         .parse_lease_buf = smb3_parse_lease_buf,
4313         .copychunk_range = smb2_copychunk_range,
4314         .duplicate_extents = smb2_duplicate_extents,
4315 /*      .validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
4316         .wp_retry_size = smb2_wp_retry_size,
4317         .dir_needs_close = smb2_dir_needs_close,
4318         .fallocate = smb3_fallocate,
4319         .enum_snapshots = smb3_enum_snapshots,
4320         .init_transform_rq = smb3_init_transform_rq,
4321         .is_transform_hdr = smb3_is_transform_hdr,
4322         .receive_transform = smb3_receive_transform,
4323         .get_dfs_refer = smb2_get_dfs_refer,
4324         .select_sectype = smb2_select_sectype,
4325 #ifdef CONFIG_CIFS_XATTR
4326         .query_all_EAs = smb2_query_eas,
4327         .set_EA = smb2_set_ea,
4328 #endif /* CIFS_XATTR */
4329 #ifdef CONFIG_CIFS_ACL
4330         .get_acl = get_smb2_acl,
4331         .get_acl_by_fid = get_smb2_acl_by_fid,
4332         .set_acl = set_smb2_acl,
4333 #endif /* CIFS_ACL */
4334         .next_header = smb2_next_header,
4335         .ioctl_query_info = smb2_ioctl_query_info,
4336         .make_node = smb2_make_node,
4337 };
4338
4339 struct smb_version_values smb20_values = {
4340         .version_string = SMB20_VERSION_STRING,
4341         .protocol_id = SMB20_PROT_ID,
4342         .req_capabilities = 0, /* MBZ */
4343         .large_lock_type = 0,
4344         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4345         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4346         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4347         .header_size = sizeof(struct smb2_sync_hdr),
4348         .header_preamble_size = 0,
4349         .max_header_size = MAX_SMB2_HDR_SIZE,
4350         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4351         .lock_cmd = SMB2_LOCK,
4352         .cap_unix = 0,
4353         .cap_nt_find = SMB2_NT_FIND,
4354         .cap_large_files = SMB2_LARGE_FILES,
4355         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4356         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4357         .create_lease_size = sizeof(struct create_lease),
4358 };
4359
4360 struct smb_version_values smb21_values = {
4361         .version_string = SMB21_VERSION_STRING,
4362         .protocol_id = SMB21_PROT_ID,
4363         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
4364         .large_lock_type = 0,
4365         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4366         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4367         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4368         .header_size = sizeof(struct smb2_sync_hdr),
4369         .header_preamble_size = 0,
4370         .max_header_size = MAX_SMB2_HDR_SIZE,
4371         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4372         .lock_cmd = SMB2_LOCK,
4373         .cap_unix = 0,
4374         .cap_nt_find = SMB2_NT_FIND,
4375         .cap_large_files = SMB2_LARGE_FILES,
4376         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4377         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4378         .create_lease_size = sizeof(struct create_lease),
4379 };
4380
4381 struct smb_version_values smb3any_values = {
4382         .version_string = SMB3ANY_VERSION_STRING,
4383         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
4384         .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,
4385         .large_lock_type = 0,
4386         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4387         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4388         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4389         .header_size = sizeof(struct smb2_sync_hdr),
4390         .header_preamble_size = 0,
4391         .max_header_size = MAX_SMB2_HDR_SIZE,
4392         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4393         .lock_cmd = SMB2_LOCK,
4394         .cap_unix = 0,
4395         .cap_nt_find = SMB2_NT_FIND,
4396         .cap_large_files = SMB2_LARGE_FILES,
4397         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4398         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4399         .create_lease_size = sizeof(struct create_lease_v2),
4400 };
4401
4402 struct smb_version_values smbdefault_values = {
4403         .version_string = SMBDEFAULT_VERSION_STRING,
4404         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
4405         .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,
4406         .large_lock_type = 0,
4407         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4408         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4409         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4410         .header_size = sizeof(struct smb2_sync_hdr),
4411         .header_preamble_size = 0,
4412         .max_header_size = MAX_SMB2_HDR_SIZE,
4413         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4414         .lock_cmd = SMB2_LOCK,
4415         .cap_unix = 0,
4416         .cap_nt_find = SMB2_NT_FIND,
4417         .cap_large_files = SMB2_LARGE_FILES,
4418         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4419         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4420         .create_lease_size = sizeof(struct create_lease_v2),
4421 };
4422
4423 struct smb_version_values smb30_values = {
4424         .version_string = SMB30_VERSION_STRING,
4425         .protocol_id = SMB30_PROT_ID,
4426         .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,
4427         .large_lock_type = 0,
4428         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4429         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4430         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4431         .header_size = sizeof(struct smb2_sync_hdr),
4432         .header_preamble_size = 0,
4433         .max_header_size = MAX_SMB2_HDR_SIZE,
4434         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4435         .lock_cmd = SMB2_LOCK,
4436         .cap_unix = 0,
4437         .cap_nt_find = SMB2_NT_FIND,
4438         .cap_large_files = SMB2_LARGE_FILES,
4439         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4440         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4441         .create_lease_size = sizeof(struct create_lease_v2),
4442 };
4443
4444 struct smb_version_values smb302_values = {
4445         .version_string = SMB302_VERSION_STRING,
4446         .protocol_id = SMB302_PROT_ID,
4447         .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,
4448         .large_lock_type = 0,
4449         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4450         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4451         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4452         .header_size = sizeof(struct smb2_sync_hdr),
4453         .header_preamble_size = 0,
4454         .max_header_size = MAX_SMB2_HDR_SIZE,
4455         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4456         .lock_cmd = SMB2_LOCK,
4457         .cap_unix = 0,
4458         .cap_nt_find = SMB2_NT_FIND,
4459         .cap_large_files = SMB2_LARGE_FILES,
4460         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4461         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4462         .create_lease_size = sizeof(struct create_lease_v2),
4463 };
4464
4465 struct smb_version_values smb311_values = {
4466         .version_string = SMB311_VERSION_STRING,
4467         .protocol_id = SMB311_PROT_ID,
4468         .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,
4469         .large_lock_type = 0,
4470         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4471         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4472         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4473         .header_size = sizeof(struct smb2_sync_hdr),
4474         .header_preamble_size = 0,
4475         .max_header_size = MAX_SMB2_HDR_SIZE,
4476         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4477         .lock_cmd = SMB2_LOCK,
4478         .cap_unix = 0,
4479         .cap_nt_find = SMB2_NT_FIND,
4480         .cap_large_files = SMB2_LARGE_FILES,
4481         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4482         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4483         .create_lease_size = sizeof(struct create_lease_v2),
4484 };