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