fs/cifs/smb2ops.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  SMB2 version specific operations
   4  *
   5  *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
   6  */
   7
   8 #include <linux/pagemap.h>
   9 #include <linux/vfs.h>
  10 #include <linux/falloc.h>
  11 #include <linux/scatterlist.h>
  12 #include <linux/uuid.h>
  13 #include <crypto/aead.h>
  14 #include "cifsglob.h"
  15 #include "smb2pdu.h"
  16 #include "smb2proto.h"
  17 #include "cifsproto.h"
  18 #include "cifs_debug.h"
  19 #include "cifs_unicode.h"
  20 #include "smb2status.h"
  21 #include "smb2glob.h"
  22 #include "cifs_ioctl.h"
  23 #include "smbdirect.h"
  24
  25 /* Change credits for different ops and return the total number of credits */
  26 static int
  27 change_conf(struct TCP_Server_Info *server)
  28 {
  29         server->credits += server->echo_credits + server->oplock_credits;
  30         server->oplock_credits = server->echo_credits = 0;
  31         switch (server->credits) {
  32         case 0:
  33                 return 0;
  34         case 1:
  35                 server->echoes = false;
  36                 server->oplocks = false;
  37                 break;
  38         case 2:
  39                 server->echoes = true;
  40                 server->oplocks = false;
  41                 server->echo_credits = 1;
  42                 break;
  43         default:
  44                 server->echoes = true;
  45                 if (enable_oplocks) {
  46                         server->oplocks = true;
  47                         server->oplock_credits = 1;
  48                 } else
  49                         server->oplocks = false;
  50
  51                 server->echo_credits = 1;
  52         }
  53         server->credits -= server->echo_credits + server->oplock_credits;
  54         return server->credits + server->echo_credits + server->oplock_credits;
  55 }
  56
  57 static void
  58 smb2_add_credits(struct TCP_Server_Info *server,
  59                  const struct cifs_credits *credits, const int optype)
  60 {
  61         int *val, rc = -1;
  62         unsigned int add = credits->value;
  63         unsigned int instance = credits->instance;
  64         bool reconnect_detected = false;
  65
  66         spin_lock(&server->req_lock);
  67         val = server->ops->get_credits_field(server, optype);
  68
  69         /* eg found case where write overlapping reconnect messed up credits */
  70         if (((optype & CIFS_OP_MASK) == CIFS_NEG_OP) && (*val != 0))
  71                 trace_smb3_reconnect_with_invalid_credits(server->CurrentMid,
  72                         server->hostname, *val);
  73         if ((instance == 0) || (instance == server->reconnect_instance))
  74                 *val += add;
  75         else
  76                 reconnect_detected = true;
  77
  78         if (*val > 65000) {
  79                 *val = 65000; /* Don't get near 64K credits, avoid srv bugs */
  80                 printk_once(KERN_WARNING "server overflowed SMB3 credits\n");
  81         }
  82         server->in_flight--;
  83         if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
  84                 rc = change_conf(server);
  85         /*
  86          * Sometimes server returns 0 credits on oplock break ack - we need to
  87          * rebalance credits in this case.
  88          */
  89         else if (server->in_flight > 0 && server->oplock_credits == 0 &&
  90                  server->oplocks) {
  91                 if (server->credits > 1) {
  92                         server->credits--;
  93                         server->oplock_credits++;
  94                 }
  95         }
  96         spin_unlock(&server->req_lock);
  97         wake_up(&server->request_q);
  98
  99         if (reconnect_detected)
 100                 cifs_dbg(FYI, "trying to put %d credits from the old server instance %d\n",
 101                          add, instance);
 102
 103         if (server->tcpStatus == CifsNeedReconnect
 104             || server->tcpStatus == CifsExiting)
 105                 return;
 106
 107         switch (rc) {
 108         case -1:
 109                 /* change_conf hasn't been executed */
 110                 break;
 111         case 0:
 112                 cifs_dbg(VFS, "Possible client or server bug - zero credits\n");
 113                 break;
 114         case 1:
 115                 cifs_dbg(VFS, "disabling echoes and oplocks\n");
 116                 break;
 117         case 2:
 118                 cifs_dbg(FYI, "disabling oplocks\n");
 119                 break;
 120         default:
 121                 cifs_dbg(FYI, "add %u credits total=%d\n", add, rc);
 122         }
 123 }
 124
 125 static void
 126 smb2_set_credits(struct TCP_Server_Info *server, const int val)
 127 {
 128         spin_lock(&server->req_lock);
 129         server->credits = val;
 130         if (val == 1)
 131                 server->reconnect_instance++;
 132         spin_unlock(&server->req_lock);
 133         /* don't log while holding the lock */
 134         if (val == 1)
 135                 cifs_dbg(FYI, "set credits to 1 due to smb2 reconnect\n");
 136 }
 137
 138 static int *
 139 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
 140 {
 141         switch (optype) {
 142         case CIFS_ECHO_OP:
 143                 return &server->echo_credits;
 144         case CIFS_OBREAK_OP:
 145                 return &server->oplock_credits;
 146         default:
 147                 return &server->credits;
 148         }
 149 }
 150
 151 static unsigned int
 152 smb2_get_credits(struct mid_q_entry *mid)
 153 {
 154         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)mid->resp_buf;
 155
 156         if (mid->mid_state == MID_RESPONSE_RECEIVED
 157             || mid->mid_state == MID_RESPONSE_MALFORMED)
 158                 return le16_to_cpu(shdr->CreditRequest);
 159
 160         return 0;
 161 }
 162
 163 static int
 164 smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
 165                       unsigned int *num, struct cifs_credits *credits)
 166 {
 167         int rc = 0;
 168         unsigned int scredits;
 169
 170         spin_lock(&server->req_lock);
 171         while (1) {
 172                 if (server->credits <= 0) {
 173                         spin_unlock(&server->req_lock);
 174                         cifs_num_waiters_inc(server);
 175                         rc = wait_event_killable(server->request_q,
 176                                 has_credits(server, &server->credits, 1));
 177                         cifs_num_waiters_dec(server);
 178                         if (rc)
 179                                 return rc;
 180                         spin_lock(&server->req_lock);
 181                 } else {
 182                         if (server->tcpStatus == CifsExiting) {
 183                                 spin_unlock(&server->req_lock);
 184                                 return -ENOENT;
 185                         }
 186
 187                         scredits = server->credits;
 188                         /* can deadlock with reopen */
 189                         if (scredits <= 8) {
 190                                 *num = SMB2_MAX_BUFFER_SIZE;
 191                                 credits->value = 0;
 192                                 credits->instance = 0;
 193                                 break;
 194                         }
 195
 196                         /* leave some credits for reopen and other ops */
 197                         scredits -= 8;
 198                         *num = min_t(unsigned int, size,
 199                                      scredits * SMB2_MAX_BUFFER_SIZE);
 200
 201                         credits->value =
 202                                 DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
 203                         credits->instance = server->reconnect_instance;
 204                         server->credits -= credits->value;
 205                         server->in_flight++;
 206                         break;
 207                 }
 208         }
 209         spin_unlock(&server->req_lock);
 210         return rc;
 211 }
 212
 213 static int
 214 smb2_adjust_credits(struct TCP_Server_Info *server,
 215                     struct cifs_credits *credits,
 216                     const unsigned int payload_size)
 217 {
 218         int new_val = DIV_ROUND_UP(payload_size, SMB2_MAX_BUFFER_SIZE);
 219
 220         if (!credits->value || credits->value == new_val)
 221                 return 0;
 222
 223         if (credits->value < new_val) {
 224                 WARN_ONCE(1, "request has less credits (%d) than required (%d)",
 225                           credits->value, new_val);
 226                 return -ENOTSUPP;
 227         }
 228
 229         spin_lock(&server->req_lock);
 230
 231         if (server->reconnect_instance != credits->instance) {
 232                 spin_unlock(&server->req_lock);
 233                 cifs_dbg(VFS, "trying to return %d credits to old session\n",
 234                          credits->value - new_val);
 235                 return -EAGAIN;
 236         }
 237
 238         server->credits += credits->value - new_val;
 239         spin_unlock(&server->req_lock);
 240         wake_up(&server->request_q);
 241         credits->value = new_val;
 242         return 0;
 243 }
 244
 245 static __u64
 246 smb2_get_next_mid(struct TCP_Server_Info *server)
 247 {
 248         __u64 mid;
 249         /* for SMB2 we need the current value */
 250         spin_lock(&GlobalMid_Lock);
 251         mid = server->CurrentMid++;
 252         spin_unlock(&GlobalMid_Lock);
 253         return mid;
 254 }
 255
 256 static void
 257 smb2_revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
 258 {
 259         spin_lock(&GlobalMid_Lock);
 260         if (server->CurrentMid >= val)
 261                 server->CurrentMid -= val;
 262         spin_unlock(&GlobalMid_Lock);
 263 }
 264
 265 static struct mid_q_entry *
 266 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
 267 {
 268         struct mid_q_entry *mid;
 269         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
 270         __u64 wire_mid = le64_to_cpu(shdr->MessageId);
 271
 272         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 273                 cifs_dbg(VFS, "Encrypted frame parsing not supported yet\n");
 274                 return NULL;
 275         }
 276
 277         spin_lock(&GlobalMid_Lock);
 278         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 279                 if ((mid->mid == wire_mid) &&
 280                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
 281                     (mid->command == shdr->Command)) {
 282                         kref_get(&mid->refcount);
 283                         spin_unlock(&GlobalMid_Lock);
 284                         return mid;
 285                 }
 286         }
 287         spin_unlock(&GlobalMid_Lock);
 288         return NULL;
 289 }
 290
 291 static void
 292 smb2_dump_detail(void *buf, struct TCP_Server_Info *server)
 293 {
 294 #ifdef CONFIG_CIFS_DEBUG2
 295         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
 296
 297         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
 298                  shdr->Command, shdr->Status, shdr->Flags, shdr->MessageId,
 299                  shdr->ProcessId);
 300         cifs_dbg(VFS, "smb buf %p len %u\n", buf,
 301                  server->ops->calc_smb_size(buf, server));
 302 #endif
 303 }
 304
 305 static bool
 306 smb2_need_neg(struct TCP_Server_Info *server)
 307 {
 308         return server->max_read == 0;
 309 }
 310
 311 static int
 312 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 313 {
 314         int rc;
 315
 316         ses->server->CurrentMid = 0;
 317         rc = SMB2_negotiate(xid, ses);
 318         /* BB we probably don't need to retry with modern servers */
 319         if (rc == -EAGAIN)
 320                 rc = -EHOSTDOWN;
 321         return rc;
 322 }
 323
 324 static unsigned int
 325 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 326 {
 327         struct TCP_Server_Info *server = tcon->ses->server;
 328         unsigned int wsize;
 329
 330         /* start with specified wsize, or default */
 331         wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
 332         wsize = min_t(unsigned int, wsize, server->max_write);
 333 #ifdef CONFIG_CIFS_SMB_DIRECT
 334         if (server->rdma) {
 335                 if (server->sign)
 336                         wsize = min_t(unsigned int,
 337                                 wsize, server->smbd_conn->max_fragmented_send_size);
 338                 else
 339                         wsize = min_t(unsigned int,
 340                                 wsize, server->smbd_conn->max_readwrite_size);
 341         }
 342 #endif
 343         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 344                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 345
 346         return wsize;
 347 }
 348
 349 static unsigned int
 350 smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 351 {
 352         struct TCP_Server_Info *server = tcon->ses->server;
 353         unsigned int wsize;
 354
 355         /* start with specified wsize, or default */
 356         wsize = volume_info->wsize ? volume_info->wsize : SMB3_DEFAULT_IOSIZE;
 357         wsize = min_t(unsigned int, wsize, server->max_write);
 358 #ifdef CONFIG_CIFS_SMB_DIRECT
 359         if (server->rdma) {
 360                 if (server->sign)
 361                         wsize = min_t(unsigned int,
 362                                 wsize, server->smbd_conn->max_fragmented_send_size);
 363                 else
 364                         wsize = min_t(unsigned int,
 365                                 wsize, server->smbd_conn->max_readwrite_size);
 366         }
 367 #endif
 368         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 369                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 370
 371         return wsize;
 372 }
 373
 374 static unsigned int
 375 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 376 {
 377         struct TCP_Server_Info *server = tcon->ses->server;
 378         unsigned int rsize;
 379
 380         /* start with specified rsize, or default */
 381         rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
 382         rsize = min_t(unsigned int, rsize, server->max_read);
 383 #ifdef CONFIG_CIFS_SMB_DIRECT
 384         if (server->rdma) {
 385                 if (server->sign)
 386                         rsize = min_t(unsigned int,
 387                                 rsize, server->smbd_conn->max_fragmented_recv_size);
 388                 else
 389                         rsize = min_t(unsigned int,
 390                                 rsize, server->smbd_conn->max_readwrite_size);
 391         }
 392 #endif
 393
 394         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 395                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 396
 397         return rsize;
 398 }
 399
 400 static unsigned int
 401 smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 402 {
 403         struct TCP_Server_Info *server = tcon->ses->server;
 404         unsigned int rsize;
 405
 406         /* start with specified rsize, or default */
 407         rsize = volume_info->rsize ? volume_info->rsize : SMB3_DEFAULT_IOSIZE;
 408         rsize = min_t(unsigned int, rsize, server->max_read);
 409 #ifdef CONFIG_CIFS_SMB_DIRECT
 410         if (server->rdma) {
 411                 if (server->sign)
 412                         rsize = min_t(unsigned int,
 413                                 rsize, server->smbd_conn->max_fragmented_recv_size);
 414                 else
 415                         rsize = min_t(unsigned int,
 416                                 rsize, server->smbd_conn->max_readwrite_size);
 417         }
 418 #endif
 419
 420         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 421                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 422
 423         return rsize;
 424 }
 425
 426 static int
 427 parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
 428                         size_t buf_len,
 429                         struct cifs_server_iface **iface_list,
 430                         size_t *iface_count)
 431 {
 432         struct network_interface_info_ioctl_rsp *p;
 433         struct sockaddr_in *addr4;
 434         struct sockaddr_in6 *addr6;
 435         struct iface_info_ipv4 *p4;
 436         struct iface_info_ipv6 *p6;
 437         struct cifs_server_iface *info;
 438         ssize_t bytes_left;
 439         size_t next = 0;
 440         int nb_iface = 0;
 441         int rc = 0;
 442
 443         *iface_list = NULL;
 444         *iface_count = 0;
 445
 446         /*
 447          * Fist pass: count and sanity check
 448          */
 449
 450         bytes_left = buf_len;
 451         p = buf;
 452         while (bytes_left >= sizeof(*p)) {
 453                 nb_iface++;
 454                 next = le32_to_cpu(p->Next);
 455                 if (!next) {
 456                         bytes_left -= sizeof(*p);
 457                         break;
 458                 }
 459                 p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
 460                 bytes_left -= next;
 461         }
 462
 463         if (!nb_iface) {
 464                 cifs_dbg(VFS, "%s: malformed interface info\n", __func__);
 465                 rc = -EINVAL;
 466                 goto out;
 467         }
 468
 469         if (bytes_left || p->Next)
 470                 cifs_dbg(VFS, "%s: incomplete interface info\n", __func__);
 471
 472
 473         /*
 474          * Second pass: extract info to internal structure
 475          */
 476
 477         *iface_list = kcalloc(nb_iface, sizeof(**iface_list), GFP_KERNEL);
 478         if (!*iface_list) {
 479                 rc = -ENOMEM;
 480                 goto out;
 481         }
 482
 483         info = *iface_list;
 484         bytes_left = buf_len;
 485         p = buf;
 486         while (bytes_left >= sizeof(*p)) {
 487                 info->speed = le64_to_cpu(p->LinkSpeed);
 488                 info->rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE);
 489                 info->rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE);
 490
 491                 cifs_dbg(FYI, "%s: adding iface %zu\n", __func__, *iface_count);
 492                 cifs_dbg(FYI, "%s: speed %zu bps\n", __func__, info->speed);
 493                 cifs_dbg(FYI, "%s: capabilities 0x%08x\n", __func__,
 494                          le32_to_cpu(p->Capability));
 495
 496                 switch (p->Family) {
 497                 /*
 498                  * The kernel and wire socket structures have the same
 499                  * layout and use network byte order but make the
 500                  * conversion explicit in case either one changes.
 501                  */
 502                 case INTERNETWORK:
 503                         addr4 = (struct sockaddr_in *)&info->sockaddr;
 504                         p4 = (struct iface_info_ipv4 *)p->Buffer;
 505                         addr4->sin_family = AF_INET;
 506                         memcpy(&addr4->sin_addr, &p4->IPv4Address, 4);
 507
 508                         /* [MS-SMB2] 2.2.32.5.1.1 Clients MUST ignore these */
 509                         addr4->sin_port = cpu_to_be16(CIFS_PORT);
 510
 511                         cifs_dbg(FYI, "%s: ipv4 %pI4\n", __func__,
 512                                  &addr4->sin_addr);
 513                         break;
 514                 case INTERNETWORKV6:
 515                         addr6 = (struct sockaddr_in6 *)&info->sockaddr;
 516                         p6 = (struct iface_info_ipv6 *)p->Buffer;
 517                         addr6->sin6_family = AF_INET6;
 518                         memcpy(&addr6->sin6_addr, &p6->IPv6Address, 16);
 519
 520                         /* [MS-SMB2] 2.2.32.5.1.2 Clients MUST ignore these */
 521                         addr6->sin6_flowinfo = 0;
 522                         addr6->sin6_scope_id = 0;
 523                         addr6->sin6_port = cpu_to_be16(CIFS_PORT);
 524
 525                         cifs_dbg(FYI, "%s: ipv6 %pI6\n", __func__,
 526                                  &addr6->sin6_addr);
 527                         break;
 528                 default:
 529                         cifs_dbg(VFS,
 530                                  "%s: skipping unsupported socket family\n",
 531                                  __func__);
 532                         goto next_iface;
 533                 }
 534
 535                 (*iface_count)++;
 536                 info++;
 537 next_iface:
 538                 next = le32_to_cpu(p->Next);
 539                 if (!next)
 540                         break;
 541                 p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
 542                 bytes_left -= next;
 543         }
 544
 545         if (!*iface_count) {
 546                 rc = -EINVAL;
 547                 goto out;
 548         }
 549
 550 out:
 551         if (rc) {
 552                 kfree(*iface_list);
 553                 *iface_count = 0;
 554                 *iface_list = NULL;
 555         }
 556         return rc;
 557 }
 558
 559
 560 static int
 561 SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
 562 {
 563         int rc;
 564         unsigned int ret_data_len = 0;
 565         struct network_interface_info_ioctl_rsp *out_buf = NULL;
 566         struct cifs_server_iface *iface_list;
 567         size_t iface_count;
 568         struct cifs_ses *ses = tcon->ses;
 569
 570         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 571                         FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
 572                         NULL /* no data input */, 0 /* no data input */,
 573                         CIFSMaxBufSize, (char **)&out_buf, &ret_data_len);
 574         if (rc == -EOPNOTSUPP) {
 575                 cifs_dbg(FYI,
 576                          "server does not support query network interfaces\n");
 577                 goto out;
 578         } else if (rc != 0) {
 579                 cifs_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
 580                 goto out;
 581         }
 582
 583         rc = parse_server_interfaces(out_buf, ret_data_len,
 584                                      &iface_list, &iface_count);
 585         if (rc)
 586                 goto out;
 587
 588         spin_lock(&ses->iface_lock);
 589         kfree(ses->iface_list);
 590         ses->iface_list = iface_list;
 591         ses->iface_count = iface_count;
 592         ses->iface_last_update = jiffies;
 593         spin_unlock(&ses->iface_lock);
 594
 595 out:
 596         kfree(out_buf);
 597         return rc;
 598 }
 599
 600 static void
 601 smb2_close_cached_fid(struct kref *ref)
 602 {
 603         struct cached_fid *cfid = container_of(ref, struct cached_fid,
 604                                                refcount);
 605
 606         if (cfid->is_valid) {
 607                 cifs_dbg(FYI, "clear cached root file handle\n");
 608                 SMB2_close(0, cfid->tcon, cfid->fid->persistent_fid,
 609                            cfid->fid->volatile_fid);
 610                 cfid->is_valid = false;
 611                 cfid->file_all_info_is_valid = false;
 612         }
 613 }
 614
 615 void close_shroot(struct cached_fid *cfid)
 616 {
 617         mutex_lock(&cfid->fid_mutex);
 618         kref_put(&cfid->refcount, smb2_close_cached_fid);
 619         mutex_unlock(&cfid->fid_mutex);
 620 }
 621
 622 void
 623 smb2_cached_lease_break(struct work_struct *work)
 624 {
 625         struct cached_fid *cfid = container_of(work,
 626                                 struct cached_fid, lease_break);
 627
 628         close_shroot(cfid);
 629 }
 630
 631 /*
 632  * Open the directory at the root of a share
 633  */
 634 int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
 635 {
 636         struct cifs_ses *ses = tcon->ses;
 637         struct TCP_Server_Info *server = ses->server;
 638         struct cifs_open_parms oparms;
 639         struct smb2_create_rsp *o_rsp = NULL;
 640         struct smb2_query_info_rsp *qi_rsp = NULL;
 641         int resp_buftype[2];
 642         struct smb_rqst rqst[2];
 643         struct kvec rsp_iov[2];
 644         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
 645         struct kvec qi_iov[1];
 646         int rc, flags = 0;
 647         __le16 utf16_path = 0; /* Null - since an open of top of share */
 648         u8 oplock = SMB2_OPLOCK_LEVEL_II;
 649
 650         mutex_lock(&tcon->crfid.fid_mutex);
 651         if (tcon->crfid.is_valid) {
 652                 cifs_dbg(FYI, "found a cached root file handle\n");
 653                 memcpy(pfid, tcon->crfid.fid, sizeof(struct cifs_fid));
 654                 kref_get(&tcon->crfid.refcount);
 655                 mutex_unlock(&tcon->crfid.fid_mutex);
 656                 return 0;
 657         }
 658
 659         if (smb3_encryption_required(tcon))
 660                 flags |= CIFS_TRANSFORM_REQ;
 661
 662         memset(rqst, 0, sizeof(rqst));
 663         resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
 664         memset(rsp_iov, 0, sizeof(rsp_iov));
 665
 666         /* Open */
 667         memset(&open_iov, 0, sizeof(open_iov));
 668         rqst[0].rq_iov = open_iov;
 669         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
 670
 671         oparms.tcon = tcon;
 672         oparms.create_options = 0;
 673         oparms.desired_access = FILE_READ_ATTRIBUTES;
 674         oparms.disposition = FILE_OPEN;
 675         oparms.fid = pfid;
 676         oparms.reconnect = false;
 677
 678         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, &utf16_path);
 679         if (rc)
 680                 goto oshr_exit;
 681         smb2_set_next_command(tcon, &rqst[0]);
 682
 683         memset(&qi_iov, 0, sizeof(qi_iov));
 684         rqst[1].rq_iov = qi_iov;
 685         rqst[1].rq_nvec = 1;
 686
 687         rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID,
 688                                   COMPOUND_FID, FILE_ALL_INFORMATION,
 689                                   SMB2_O_INFO_FILE, 0,
 690                                   sizeof(struct smb2_file_all_info) +
 691                                   PATH_MAX * 2, 0, NULL);
 692         if (rc)
 693                 goto oshr_exit;
 694
 695         smb2_set_related(&rqst[1]);
 696
 697         rc = compound_send_recv(xid, ses, flags, 2, rqst,
 698                                 resp_buftype, rsp_iov);
 699         if (rc)
 700                 goto oshr_exit;
 701
 702         o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
 703         oparms.fid->persistent_fid = o_rsp->PersistentFileId;
 704         oparms.fid->volatile_fid = o_rsp->VolatileFileId;
 705 #ifdef CONFIG_CIFS_DEBUG2
 706         oparms.fid->mid = le64_to_cpu(o_rsp->sync_hdr.MessageId);
 707 #endif /* CIFS_DEBUG2 */
 708
 709         memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid));
 710         tcon->crfid.tcon = tcon;
 711         tcon->crfid.is_valid = true;
 712         kref_init(&tcon->crfid.refcount);
 713
 714         if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) {
 715                 kref_get(&tcon->crfid.refcount);
 716                 oplock = smb2_parse_lease_state(server, o_rsp,
 717                                                 &oparms.fid->epoch,
 718                                                 oparms.fid->lease_key);
 719         } else
 720                 goto oshr_exit;
 721
 722         qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
 723         if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info))
 724                 goto oshr_exit;
 725         if (!smb2_validate_and_copy_iov(
 726                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 727                                 sizeof(struct smb2_file_all_info),
 728                                 &rsp_iov[1], sizeof(struct smb2_file_all_info),
 729                                 (char *)&tcon->crfid.file_all_info))
 730                 tcon->crfid.file_all_info_is_valid = 1;
 731
 732  oshr_exit:
 733         mutex_unlock(&tcon->crfid.fid_mutex);
 734         SMB2_open_free(&rqst[0]);
 735         SMB2_query_info_free(&rqst[1]);
 736         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 737         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 738         return rc;
 739 }
 740
 741 static void
 742 smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 743 {
 744         int rc;
 745         __le16 srch_path = 0; /* Null - open root of share */
 746         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 747         struct cifs_open_parms oparms;
 748         struct cifs_fid fid;
 749         bool no_cached_open = tcon->nohandlecache;
 750
 751         oparms.tcon = tcon;
 752         oparms.desired_access = FILE_READ_ATTRIBUTES;
 753         oparms.disposition = FILE_OPEN;
 754         oparms.create_options = 0;
 755         oparms.fid = &fid;
 756         oparms.reconnect = false;
 757
 758         if (no_cached_open)
 759                 rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
 760                                NULL);
 761         else
 762                 rc = open_shroot(xid, tcon, &fid);
 763
 764         if (rc)
 765                 return;
 766
 767         SMB3_request_interfaces(xid, tcon);
 768
 769         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 770                         FS_ATTRIBUTE_INFORMATION);
 771         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 772                         FS_DEVICE_INFORMATION);
 773         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 774                         FS_VOLUME_INFORMATION);
 775         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 776                         FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
 777         if (no_cached_open)
 778                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 779         else
 780                 close_shroot(&tcon->crfid);
 781 }
 782
 783 static void
 784 smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 785 {
 786         int rc;
 787         __le16 srch_path = 0; /* Null - open root of share */
 788         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 789         struct cifs_open_parms oparms;
 790         struct cifs_fid fid;
 791
 792         oparms.tcon = tcon;
 793         oparms.desired_access = FILE_READ_ATTRIBUTES;
 794         oparms.disposition = FILE_OPEN;
 795         oparms.create_options = 0;
 796         oparms.fid = &fid;
 797         oparms.reconnect = false;
 798
 799         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL, NULL);
 800         if (rc)
 801                 return;
 802
 803         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 804                         FS_ATTRIBUTE_INFORMATION);
 805         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 806                         FS_DEVICE_INFORMATION);
 807         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 808 }
 809
 810 static int
 811 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 812                         struct cifs_sb_info *cifs_sb, const char *full_path)
 813 {
 814         int rc;
 815         __le16 *utf16_path;
 816         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 817         struct cifs_open_parms oparms;
 818         struct cifs_fid fid;
 819
 820         if ((*full_path == 0) && tcon->crfid.is_valid)
 821                 return 0;
 822
 823         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 824         if (!utf16_path)
 825                 return -ENOMEM;
 826
 827         oparms.tcon = tcon;
 828         oparms.desired_access = FILE_READ_ATTRIBUTES;
 829         oparms.disposition = FILE_OPEN;
 830         if (backup_cred(cifs_sb))
 831                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
 832         else
 833                 oparms.create_options = 0;
 834         oparms.fid = &fid;
 835         oparms.reconnect = false;
 836
 837         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
 838         if (rc) {
 839                 kfree(utf16_path);
 840                 return rc;
 841         }
 842
 843         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 844         kfree(utf16_path);
 845         return rc;
 846 }
 847
 848 static int
 849 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 850                   struct cifs_sb_info *cifs_sb, const char *full_path,
 851                   u64 *uniqueid, FILE_ALL_INFO *data)
 852 {
 853         *uniqueid = le64_to_cpu(data->IndexNumber);
 854         return 0;
 855 }
 856
 857 static int
 858 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 859                      struct cifs_fid *fid, FILE_ALL_INFO *data)
 860 {
 861         int rc;
 862         struct smb2_file_all_info *smb2_data;
 863
 864         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 865                             GFP_KERNEL);
 866         if (smb2_data == NULL)
 867                 return -ENOMEM;
 868
 869         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
 870                              smb2_data);
 871         if (!rc)
 872                 move_smb2_info_to_cifs(data, smb2_data);
 873         kfree(smb2_data);
 874         return rc;
 875 }
 876
 877 #ifdef CONFIG_CIFS_XATTR
 878 static ssize_t
 879 move_smb2_ea_to_cifs(char *dst, size_t dst_size,
 880                      struct smb2_file_full_ea_info *src, size_t src_size,
 881                      const unsigned char *ea_name)
 882 {
 883         int rc = 0;
 884         unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0;
 885         char *name, *value;
 886         size_t buf_size = dst_size;
 887         size_t name_len, value_len, user_name_len;
 888
 889         while (src_size > 0) {
 890                 name = &src->ea_data[0];
 891                 name_len = (size_t)src->ea_name_length;
 892                 value = &src->ea_data[src->ea_name_length + 1];
 893                 value_len = (size_t)le16_to_cpu(src->ea_value_length);
 894
 895                 if (name_len == 0)
 896                         break;
 897
 898                 if (src_size < 8 + name_len + 1 + value_len) {
 899                         cifs_dbg(FYI, "EA entry goes beyond length of list\n");
 900                         rc = -EIO;
 901                         goto out;
 902                 }
 903
 904                 if (ea_name) {
 905                         if (ea_name_len == name_len &&
 906                             memcmp(ea_name, name, name_len) == 0) {
 907                                 rc = value_len;
 908                                 if (dst_size == 0)
 909                                         goto out;
 910                                 if (dst_size < value_len) {
 911                                         rc = -ERANGE;
 912                                         goto out;
 913                                 }
 914                                 memcpy(dst, value, value_len);
 915                                 goto out;
 916                         }
 917                 } else {
 918                         /* 'user.' plus a terminating null */
 919                         user_name_len = 5 + 1 + name_len;
 920
 921                         if (buf_size == 0) {
 922                                 /* skip copy - calc size only */
 923                                 rc += user_name_len;
 924                         } else if (dst_size >= user_name_len) {
 925                                 dst_size -= user_name_len;
 926                                 memcpy(dst, "user.", 5);
 927                                 dst += 5;
 928                                 memcpy(dst, src->ea_data, name_len);
 929                                 dst += name_len;
 930                                 *dst = 0;
 931                                 ++dst;
 932                                 rc += user_name_len;
 933                         } else {
 934                                 /* stop before overrun buffer */
 935                                 rc = -ERANGE;
 936                                 break;
 937                         }
 938                 }
 939
 940                 if (!src->next_entry_offset)
 941                         break;
 942
 943                 if (src_size < le32_to_cpu(src->next_entry_offset)) {
 944                         /* stop before overrun buffer */
 945                         rc = -ERANGE;
 946                         break;
 947                 }
 948                 src_size -= le32_to_cpu(src->next_entry_offset);
 949                 src = (void *)((char *)src +
 950                                le32_to_cpu(src->next_entry_offset));
 951         }
 952
 953         /* didn't find the named attribute */
 954         if (ea_name)
 955                 rc = -ENODATA;
 956
 957 out:
 958         return (ssize_t)rc;
 959 }
 960
 961 static ssize_t
 962 smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
 963                const unsigned char *path, const unsigned char *ea_name,
 964                char *ea_data, size_t buf_size,
 965                struct cifs_sb_info *cifs_sb)
 966 {
 967         int rc;
 968         __le16 *utf16_path;
 969         struct kvec rsp_iov = {NULL, 0};
 970         int buftype = CIFS_NO_BUFFER;
 971         struct smb2_query_info_rsp *rsp;
 972         struct smb2_file_full_ea_info *info = NULL;
 973
 974         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 975         if (!utf16_path)
 976                 return -ENOMEM;
 977
 978         rc = smb2_query_info_compound(xid, tcon, utf16_path,
 979                                       FILE_READ_EA,
 980                                       FILE_FULL_EA_INFORMATION,
 981                                       SMB2_O_INFO_FILE,
 982                                       CIFSMaxBufSize -
 983                                       MAX_SMB2_CREATE_RESPONSE_SIZE -
 984                                       MAX_SMB2_CLOSE_RESPONSE_SIZE,
 985                                       &rsp_iov, &buftype, cifs_sb);
 986         if (rc) {
 987                 /*
 988                  * If ea_name is NULL (listxattr) and there are no EAs,
 989                  * return 0 as it's not an error. Otherwise, the specified
 990                  * ea_name was not found.
 991                  */
 992                 if (!ea_name && rc == -ENODATA)
 993                         rc = 0;
 994                 goto qeas_exit;
 995         }
 996
 997         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
 998         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
 999                                le32_to_cpu(rsp->OutputBufferLength),
1000                                &rsp_iov,
1001                                sizeof(struct smb2_file_full_ea_info));
1002         if (rc)
1003                 goto qeas_exit;
1004
1005         info = (struct smb2_file_full_ea_info *)(
1006                         le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
1007         rc = move_smb2_ea_to_cifs(ea_data, buf_size, info,
1008                         le32_to_cpu(rsp->OutputBufferLength), ea_name);
1009
1010  qeas_exit:
1011         kfree(utf16_path);
1012         free_rsp_buf(buftype, rsp_iov.iov_base);
1013         return rc;
1014 }
1015
1016
1017 static int
1018 smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
1019             const char *path, const char *ea_name, const void *ea_value,
1020             const __u16 ea_value_len, const struct nls_table *nls_codepage,
1021             struct cifs_sb_info *cifs_sb)
1022 {
1023         struct cifs_ses *ses = tcon->ses;
1024         __le16 *utf16_path = NULL;
1025         int ea_name_len = strlen(ea_name);
1026         int flags = 0;
1027         int len;
1028         struct smb_rqst rqst[3];
1029         int resp_buftype[3];
1030         struct kvec rsp_iov[3];
1031         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1032         struct cifs_open_parms oparms;
1033         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1034         struct cifs_fid fid;
1035         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
1036         unsigned int size[1];
1037         void *data[1];
1038         struct smb2_file_full_ea_info *ea = NULL;
1039         struct kvec close_iov[1];
1040         int rc;
1041
1042         if (smb3_encryption_required(tcon))
1043                 flags |= CIFS_TRANSFORM_REQ;
1044
1045         if (ea_name_len > 255)
1046                 return -EINVAL;
1047
1048         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1049         if (!utf16_path)
1050                 return -ENOMEM;
1051
1052         memset(rqst, 0, sizeof(rqst));
1053         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1054         memset(rsp_iov, 0, sizeof(rsp_iov));
1055
1056         if (ses->server->ops->query_all_EAs) {
1057                 if (!ea_value) {
1058                         rc = ses->server->ops->query_all_EAs(xid, tcon, path,
1059                                                              ea_name, NULL, 0,
1060                                                              cifs_sb);
1061                         if (rc == -ENODATA)
1062                                 goto sea_exit;
1063                 }
1064         }
1065
1066         /* Open */
1067         memset(&open_iov, 0, sizeof(open_iov));
1068         rqst[0].rq_iov = open_iov;
1069         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1070
1071         memset(&oparms, 0, sizeof(oparms));
1072         oparms.tcon = tcon;
1073         oparms.desired_access = FILE_WRITE_EA;
1074         oparms.disposition = FILE_OPEN;
1075         if (backup_cred(cifs_sb))
1076                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1077         else
1078                 oparms.create_options = 0;
1079         oparms.fid = &fid;
1080         oparms.reconnect = false;
1081
1082         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path);
1083         if (rc)
1084                 goto sea_exit;
1085         smb2_set_next_command(tcon, &rqst[0]);
1086
1087
1088         /* Set Info */
1089         memset(&si_iov, 0, sizeof(si_iov));
1090         rqst[1].rq_iov = si_iov;
1091         rqst[1].rq_nvec = 1;
1092
1093         len = sizeof(ea) + ea_name_len + ea_value_len + 1;
1094         ea = kzalloc(len, GFP_KERNEL);
1095         if (ea == NULL) {
1096                 rc = -ENOMEM;
1097                 goto sea_exit;
1098         }
1099
1100         ea->ea_name_length = ea_name_len;
1101         ea->ea_value_length = cpu_to_le16(ea_value_len);
1102         memcpy(ea->ea_data, ea_name, ea_name_len + 1);
1103         memcpy(ea->ea_data + ea_name_len + 1, ea_value, ea_value_len);
1104
1105         size[0] = len;
1106         data[0] = ea;
1107
1108         rc = SMB2_set_info_init(tcon, &rqst[1], COMPOUND_FID,
1109                                 COMPOUND_FID, current->tgid,
1110                                 FILE_FULL_EA_INFORMATION,
1111                                 SMB2_O_INFO_FILE, 0, data, size);
1112         smb2_set_next_command(tcon, &rqst[1]);
1113         smb2_set_related(&rqst[1]);
1114
1115
1116         /* Close */
1117         memset(&close_iov, 0, sizeof(close_iov));
1118         rqst[2].rq_iov = close_iov;
1119         rqst[2].rq_nvec = 1;
1120         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
1121         smb2_set_related(&rqst[2]);
1122
1123         rc = compound_send_recv(xid, ses, flags, 3, rqst,
1124                                 resp_buftype, rsp_iov);
1125
1126  sea_exit:
1127         kfree(ea);
1128         kfree(utf16_path);
1129         SMB2_open_free(&rqst[0]);
1130         SMB2_set_info_free(&rqst[1]);
1131         SMB2_close_free(&rqst[2]);
1132         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1133         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1134         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1135         return rc;
1136 }
1137 #endif
1138
1139 static bool
1140 smb2_can_echo(struct TCP_Server_Info *server)
1141 {
1142         return server->echoes;
1143 }
1144
1145 static void
1146 smb2_clear_stats(struct cifs_tcon *tcon)
1147 {
1148         int i;
1149
1150         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
1151                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
1152                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
1153         }
1154 }
1155
1156 static void
1157 smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
1158 {
1159         seq_puts(m, "\n\tShare Capabilities:");
1160         if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
1161                 seq_puts(m, " DFS,");
1162         if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
1163                 seq_puts(m, " CONTINUOUS AVAILABILITY,");
1164         if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
1165                 seq_puts(m, " SCALEOUT,");
1166         if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
1167                 seq_puts(m, " CLUSTER,");
1168         if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
1169                 seq_puts(m, " ASYMMETRIC,");
1170         if (tcon->capabilities == 0)
1171                 seq_puts(m, " None");
1172         if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
1173                 seq_puts(m, " Aligned,");
1174         if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
1175                 seq_puts(m, " Partition Aligned,");
1176         if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
1177                 seq_puts(m, " SSD,");
1178         if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
1179                 seq_puts(m, " TRIM-support,");
1180
1181         seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
1182         seq_printf(m, "\n\ttid: 0x%x", tcon->tid);
1183         if (tcon->perf_sector_size)
1184                 seq_printf(m, "\tOptimal sector size: 0x%x",
1185                            tcon->perf_sector_size);
1186         seq_printf(m, "\tMaximal Access: 0x%x", tcon->maximal_access);
1187 }
1188
1189 static void
1190 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
1191 {
1192         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
1193         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
1194
1195         /*
1196          *  Can't display SMB2_NEGOTIATE, SESSION_SETUP, LOGOFF, CANCEL and ECHO
1197          *  totals (requests sent) since those SMBs are per-session not per tcon
1198          */
1199         seq_printf(m, "\nBytes read: %llu  Bytes written: %llu",
1200                    (long long)(tcon->bytes_read),
1201                    (long long)(tcon->bytes_written));
1202         seq_printf(m, "\nOpen files: %d total (local), %d open on server",
1203                    atomic_read(&tcon->num_local_opens),
1204                    atomic_read(&tcon->num_remote_opens));
1205         seq_printf(m, "\nTreeConnects: %d total %d failed",
1206                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
1207                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
1208         seq_printf(m, "\nTreeDisconnects: %d total %d failed",
1209                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
1210                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
1211         seq_printf(m, "\nCreates: %d total %d failed",
1212                    atomic_read(&sent[SMB2_CREATE_HE]),
1213                    atomic_read(&failed[SMB2_CREATE_HE]));
1214         seq_printf(m, "\nCloses: %d total %d failed",
1215                    atomic_read(&sent[SMB2_CLOSE_HE]),
1216                    atomic_read(&failed[SMB2_CLOSE_HE]));
1217         seq_printf(m, "\nFlushes: %d total %d failed",
1218                    atomic_read(&sent[SMB2_FLUSH_HE]),
1219                    atomic_read(&failed[SMB2_FLUSH_HE]));
1220         seq_printf(m, "\nReads: %d total %d failed",
1221                    atomic_read(&sent[SMB2_READ_HE]),
1222                    atomic_read(&failed[SMB2_READ_HE]));
1223         seq_printf(m, "\nWrites: %d total %d failed",
1224                    atomic_read(&sent[SMB2_WRITE_HE]),
1225                    atomic_read(&failed[SMB2_WRITE_HE]));
1226         seq_printf(m, "\nLocks: %d total %d failed",
1227                    atomic_read(&sent[SMB2_LOCK_HE]),
1228                    atomic_read(&failed[SMB2_LOCK_HE]));
1229         seq_printf(m, "\nIOCTLs: %d total %d failed",
1230                    atomic_read(&sent[SMB2_IOCTL_HE]),
1231                    atomic_read(&failed[SMB2_IOCTL_HE]));
1232         seq_printf(m, "\nQueryDirectories: %d total %d failed",
1233                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
1234                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
1235         seq_printf(m, "\nChangeNotifies: %d total %d failed",
1236                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
1237                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
1238         seq_printf(m, "\nQueryInfos: %d total %d failed",
1239                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
1240                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
1241         seq_printf(m, "\nSetInfos: %d total %d failed",
1242                    atomic_read(&sent[SMB2_SET_INFO_HE]),
1243                    atomic_read(&failed[SMB2_SET_INFO_HE]));
1244         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
1245                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
1246                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
1247 }
1248
1249 static void
1250 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
1251 {
1252         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
1253         struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
1254
1255         cfile->fid.persistent_fid = fid->persistent_fid;
1256         cfile->fid.volatile_fid = fid->volatile_fid;
1257 #ifdef CONFIG_CIFS_DEBUG2
1258         cfile->fid.mid = fid->mid;
1259 #endif /* CIFS_DEBUG2 */
1260         server->ops->set_oplock_level(cinode, oplock, fid->epoch,
1261                                       &fid->purge_cache);
1262         cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
1263         memcpy(cfile->fid.create_guid, fid->create_guid, 16);
1264 }
1265
1266 static void
1267 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
1268                 struct cifs_fid *fid)
1269 {
1270         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1271 }
1272
1273 static int
1274 SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
1275                      u64 persistent_fid, u64 volatile_fid,
1276                      struct copychunk_ioctl *pcchunk)
1277 {
1278         int rc;
1279         unsigned int ret_data_len;
1280         struct resume_key_req *res_key;
1281
1282         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1283                         FSCTL_SRV_REQUEST_RESUME_KEY, true /* is_fsctl */,
1284                         NULL, 0 /* no input */, CIFSMaxBufSize,
1285                         (char **)&res_key, &ret_data_len);
1286
1287         if (rc) {
1288                 cifs_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
1289                 goto req_res_key_exit;
1290         }
1291         if (ret_data_len < sizeof(struct resume_key_req)) {
1292                 cifs_dbg(VFS, "Invalid refcopy resume key length\n");
1293                 rc = -EINVAL;
1294                 goto req_res_key_exit;
1295         }
1296         memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
1297
1298 req_res_key_exit:
1299         kfree(res_key);
1300         return rc;
1301 }
1302
1303 static int
1304 smb2_ioctl_query_info(const unsigned int xid,
1305                       struct cifs_tcon *tcon,
1306                       __le16 *path, int is_dir,
1307                       unsigned long p)
1308 {
1309         struct cifs_ses *ses = tcon->ses;
1310         char __user *arg = (char __user *)p;
1311         struct smb_query_info qi;
1312         struct smb_query_info __user *pqi;
1313         int rc = 0;
1314         int flags = 0;
1315         struct smb2_query_info_rsp *qi_rsp = NULL;
1316         struct smb2_ioctl_rsp *io_rsp = NULL;
1317         void *buffer = NULL;
1318         struct smb_rqst rqst[3];
1319         int resp_buftype[3];
1320         struct kvec rsp_iov[3];
1321         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1322         struct cifs_open_parms oparms;
1323         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1324         struct cifs_fid fid;
1325         struct kvec qi_iov[1];
1326         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
1327         struct kvec close_iov[1];
1328
1329         memset(rqst, 0, sizeof(rqst));
1330         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1331         memset(rsp_iov, 0, sizeof(rsp_iov));
1332
1333         if (copy_from_user(&qi, arg, sizeof(struct smb_query_info)))
1334                 return -EFAULT;
1335
1336         if (qi.output_buffer_length > 1024)
1337                 return -EINVAL;
1338
1339         if (!ses || !(ses->server))
1340                 return -EIO;
1341
1342         if (smb3_encryption_required(tcon))
1343                 flags |= CIFS_TRANSFORM_REQ;
1344
1345         buffer = kmalloc(qi.output_buffer_length, GFP_KERNEL);
1346         if (buffer == NULL)
1347                 return -ENOMEM;
1348
1349         if (copy_from_user(buffer, arg + sizeof(struct smb_query_info),
1350                            qi.output_buffer_length)) {
1351                 rc = -EFAULT;
1352                 goto iqinf_exit;
1353         }
1354
1355         /* Open */
1356         memset(&open_iov, 0, sizeof(open_iov));
1357         rqst[0].rq_iov = open_iov;
1358         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1359
1360         memset(&oparms, 0, sizeof(oparms));
1361         oparms.tcon = tcon;
1362         oparms.desired_access = FILE_READ_ATTRIBUTES | READ_CONTROL;
1363         oparms.disposition = FILE_OPEN;
1364         if (is_dir)
1365                 oparms.create_options = CREATE_NOT_FILE;
1366         else
1367                 oparms.create_options = CREATE_NOT_DIR;
1368         oparms.fid = &fid;
1369         oparms.reconnect = false;
1370
1371         /*
1372          * FSCTL codes encode the special access they need in the fsctl code.
1373          */
1374         if (qi.flags & PASSTHRU_FSCTL) {
1375                 switch (qi.info_type & FSCTL_DEVICE_ACCESS_MASK) {
1376                 case FSCTL_DEVICE_ACCESS_FILE_READ_WRITE_ACCESS:
1377                         oparms.desired_access = FILE_READ_DATA | FILE_WRITE_DATA | FILE_READ_ATTRIBUTES | SYNCHRONIZE;
1378                         break;
1379                 case FSCTL_DEVICE_ACCESS_FILE_ANY_ACCESS:
1380                         oparms.desired_access = GENERIC_ALL;
1381                         break;
1382                 case FSCTL_DEVICE_ACCESS_FILE_READ_ACCESS:
1383                         oparms.desired_access = GENERIC_READ;
1384                         break;
1385                 case FSCTL_DEVICE_ACCESS_FILE_WRITE_ACCESS:
1386                         oparms.desired_access = GENERIC_WRITE;
1387                         break;
1388                 }
1389         }
1390
1391         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, path);
1392         if (rc)
1393                 goto iqinf_exit;
1394         smb2_set_next_command(tcon, &rqst[0]);
1395
1396         /* Query */
1397         if (qi.flags & PASSTHRU_FSCTL) {
1398                 /* Can eventually relax perm check since server enforces too */
1399                 if (!capable(CAP_SYS_ADMIN))
1400                         rc = -EPERM;
1401                 else  {
1402                         memset(&io_iov, 0, sizeof(io_iov));
1403                         rqst[1].rq_iov = io_iov;
1404                         rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
1405
1406                         rc = SMB2_ioctl_init(tcon, &rqst[1],
1407                                              COMPOUND_FID, COMPOUND_FID,
1408                                              qi.info_type, true, buffer,
1409                                              qi.output_buffer_length,
1410                                              CIFSMaxBufSize);
1411                 }
1412         } else if (qi.flags == PASSTHRU_QUERY_INFO) {
1413                 memset(&qi_iov, 0, sizeof(qi_iov));
1414                 rqst[1].rq_iov = qi_iov;
1415                 rqst[1].rq_nvec = 1;
1416
1417                 rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID,
1418                                   COMPOUND_FID, qi.file_info_class,
1419                                   qi.info_type, qi.additional_information,
1420                                   qi.input_buffer_length,
1421                                   qi.output_buffer_length, buffer);
1422         } else { /* unknown flags */
1423                 cifs_dbg(VFS, "invalid passthru query flags: 0x%x\n", qi.flags);
1424                 rc = -EINVAL;
1425         }
1426
1427         if (rc)
1428                 goto iqinf_exit;
1429         smb2_set_next_command(tcon, &rqst[1]);
1430         smb2_set_related(&rqst[1]);
1431
1432         /* Close */
1433         memset(&close_iov, 0, sizeof(close_iov));
1434         rqst[2].rq_iov = close_iov;
1435         rqst[2].rq_nvec = 1;
1436
1437         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
1438         if (rc)
1439                 goto iqinf_exit;
1440         smb2_set_related(&rqst[2]);
1441
1442         rc = compound_send_recv(xid, ses, flags, 3, rqst,
1443                                 resp_buftype, rsp_iov);
1444         if (rc)
1445                 goto iqinf_exit;
1446         if (qi.flags & PASSTHRU_FSCTL) {
1447                 pqi = (struct smb_query_info __user *)arg;
1448                 io_rsp = (struct smb2_ioctl_rsp *)rsp_iov[1].iov_base;
1449                 if (le32_to_cpu(io_rsp->OutputCount) < qi.input_buffer_length)
1450                         qi.input_buffer_length = le32_to_cpu(io_rsp->OutputCount);
1451                 if (qi.input_buffer_length > 0 &&
1452                     le32_to_cpu(io_rsp->OutputOffset) + qi.input_buffer_length > rsp_iov[1].iov_len) {
1453                         rc = -EFAULT;
1454                         goto iqinf_exit;
1455                 }
1456                 if (copy_to_user(&pqi->input_buffer_length, &qi.input_buffer_length,
1457                                  sizeof(qi.input_buffer_length))) {
1458                         rc = -EFAULT;
1459                         goto iqinf_exit;
1460                 }
1461                 if (copy_to_user((void __user *)pqi + sizeof(struct smb_query_info),
1462                                  (const void *)io_rsp + le32_to_cpu(io_rsp->OutputOffset),
1463                                  qi.input_buffer_length)) {
1464                         rc = -EFAULT;
1465                         goto iqinf_exit;
1466                 }
1467         } else {
1468                 pqi = (struct smb_query_info __user *)arg;
1469                 qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
1470                 if (le32_to_cpu(qi_rsp->OutputBufferLength) < qi.input_buffer_length)
1471                         qi.input_buffer_length = le32_to_cpu(qi_rsp->OutputBufferLength);
1472                 if (copy_to_user(&pqi->input_buffer_length, &qi.input_buffer_length,
1473                                  sizeof(qi.input_buffer_length))) {
1474                         rc = -EFAULT;
1475                         goto iqinf_exit;
1476                 }
1477                 if (copy_to_user(pqi + 1, qi_rsp->Buffer, qi.input_buffer_length)) {
1478                         rc = -EFAULT;
1479                         goto iqinf_exit;
1480                 }
1481         }
1482
1483  iqinf_exit:
1484         kfree(buffer);
1485         SMB2_open_free(&rqst[0]);
1486         if (qi.flags & PASSTHRU_FSCTL)
1487                 SMB2_ioctl_free(&rqst[1]);
1488         else
1489                 SMB2_query_info_free(&rqst[1]);
1490
1491         SMB2_close_free(&rqst[2]);
1492         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1493         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1494         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1495         return rc;
1496 }
1497
1498 static ssize_t
1499 smb2_copychunk_range(const unsigned int xid,
1500                         struct cifsFileInfo *srcfile,
1501                         struct cifsFileInfo *trgtfile, u64 src_off,
1502                         u64 len, u64 dest_off)
1503 {
1504         int rc;
1505         unsigned int ret_data_len;
1506         struct copychunk_ioctl *pcchunk;
1507         struct copychunk_ioctl_rsp *retbuf = NULL;
1508         struct cifs_tcon *tcon;
1509         int chunks_copied = 0;
1510         bool chunk_sizes_updated = false;
1511         ssize_t bytes_written, total_bytes_written = 0;
1512
1513         pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
1514
1515         if (pcchunk == NULL)
1516                 return -ENOMEM;
1517
1518         cifs_dbg(FYI, "%s: about to call request res key\n", __func__);
1519         /* Request a key from the server to identify the source of the copy */
1520         rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
1521                                 srcfile->fid.persistent_fid,
1522                                 srcfile->fid.volatile_fid, pcchunk);
1523
1524         /* Note: request_res_key sets res_key null only if rc !=0 */
1525         if (rc)
1526                 goto cchunk_out;
1527
1528         /* For now array only one chunk long, will make more flexible later */
1529         pcchunk->ChunkCount = cpu_to_le32(1);
1530         pcchunk->Reserved = 0;
1531         pcchunk->Reserved2 = 0;
1532
1533         tcon = tlink_tcon(trgtfile->tlink);
1534
1535         while (len > 0) {
1536                 pcchunk->SourceOffset = cpu_to_le64(src_off);
1537                 pcchunk->TargetOffset = cpu_to_le64(dest_off);
1538                 pcchunk->Length =
1539                         cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));
1540
1541                 /* Request server copy to target from src identified by key */
1542                 rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1543                         trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
1544                         true /* is_fsctl */, (char *)pcchunk,
1545                         sizeof(struct copychunk_ioctl), CIFSMaxBufSize,
1546                         (char **)&retbuf, &ret_data_len);
1547                 if (rc == 0) {
1548                         if (ret_data_len !=
1549                                         sizeof(struct copychunk_ioctl_rsp)) {
1550                                 cifs_dbg(VFS, "invalid cchunk response size\n");
1551                                 rc = -EIO;
1552                                 goto cchunk_out;
1553                         }
1554                         if (retbuf->TotalBytesWritten == 0) {
1555                                 cifs_dbg(FYI, "no bytes copied\n");
1556                                 rc = -EIO;
1557                                 goto cchunk_out;
1558                         }
1559                         /*
1560                          * Check if server claimed to write more than we asked
1561                          */
1562                         if (le32_to_cpu(retbuf->TotalBytesWritten) >
1563                             le32_to_cpu(pcchunk->Length)) {
1564                                 cifs_dbg(VFS, "invalid copy chunk response\n");
1565                                 rc = -EIO;
1566                                 goto cchunk_out;
1567                         }
1568                         if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
1569                                 cifs_dbg(VFS, "invalid num chunks written\n");
1570                                 rc = -EIO;
1571                                 goto cchunk_out;
1572                         }
1573                         chunks_copied++;
1574
1575                         bytes_written = le32_to_cpu(retbuf->TotalBytesWritten);
1576                         src_off += bytes_written;
1577                         dest_off += bytes_written;
1578                         len -= bytes_written;
1579                         total_bytes_written += bytes_written;
1580
1581                         cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %zu\n",
1582                                 le32_to_cpu(retbuf->ChunksWritten),
1583                                 le32_to_cpu(retbuf->ChunkBytesWritten),
1584                                 bytes_written);
1585                 } else if (rc == -EINVAL) {
1586                         if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
1587                                 goto cchunk_out;
1588
1589                         cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
1590                                 le32_to_cpu(retbuf->ChunksWritten),
1591                                 le32_to_cpu(retbuf->ChunkBytesWritten),
1592                                 le32_to_cpu(retbuf->TotalBytesWritten));
1593
1594                         /*
1595                          * Check if this is the first request using these sizes,
1596                          * (ie check if copy succeed once with original sizes
1597                          * and check if the server gave us different sizes after
1598                          * we already updated max sizes on previous request).
1599                          * if not then why is the server returning an error now
1600                          */
1601                         if ((chunks_copied != 0) || chunk_sizes_updated)
1602                                 goto cchunk_out;
1603
1604                         /* Check that server is not asking us to grow size */
1605                         if (le32_to_cpu(retbuf->ChunkBytesWritten) <
1606                                         tcon->max_bytes_chunk)
1607                                 tcon->max_bytes_chunk =
1608                                         le32_to_cpu(retbuf->ChunkBytesWritten);
1609                         else
1610                                 goto cchunk_out; /* server gave us bogus size */
1611
1612                         /* No need to change MaxChunks since already set to 1 */
1613                         chunk_sizes_updated = true;
1614                 } else
1615                         goto cchunk_out;
1616         }
1617
1618 cchunk_out:
1619         kfree(pcchunk);
1620         kfree(retbuf);
1621         if (rc)
1622                 return rc;
1623         else
1624                 return total_bytes_written;
1625 }
1626
1627 static int
1628 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
1629                 struct cifs_fid *fid)
1630 {
1631         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1632 }
1633
1634 static unsigned int
1635 smb2_read_data_offset(char *buf)
1636 {
1637         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1638
1639         return rsp->DataOffset;
1640 }
1641
1642 static unsigned int
1643 smb2_read_data_length(char *buf, bool in_remaining)
1644 {
1645         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1646
1647         if (in_remaining)
1648                 return le32_to_cpu(rsp->DataRemaining);
1649
1650         return le32_to_cpu(rsp->DataLength);
1651 }
1652
1653
1654 static int
1655 smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
1656                struct cifs_io_parms *parms, unsigned int *bytes_read,
1657                char **buf, int *buf_type)
1658 {
1659         parms->persistent_fid = pfid->persistent_fid;
1660         parms->volatile_fid = pfid->volatile_fid;
1661         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
1662 }
1663
1664 static int
1665 smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
1666                 struct cifs_io_parms *parms, unsigned int *written,
1667                 struct kvec *iov, unsigned long nr_segs)
1668 {
1669
1670         parms->persistent_fid = pfid->persistent_fid;
1671         parms->volatile_fid = pfid->volatile_fid;
1672         return SMB2_write(xid, parms, written, iov, nr_segs);
1673 }
1674
1675 /* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
1676 static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
1677                 struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
1678 {
1679         struct cifsInodeInfo *cifsi;
1680         int rc;
1681
1682         cifsi = CIFS_I(inode);
1683
1684         /* if file already sparse don't bother setting sparse again */
1685         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
1686                 return true; /* already sparse */
1687
1688         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
1689                 return true; /* already not sparse */
1690
1691         /*
1692          * Can't check for sparse support on share the usual way via the
1693          * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
1694          * since Samba server doesn't set the flag on the share, yet
1695          * supports the set sparse FSCTL and returns sparse correctly
1696          * in the file attributes. If we fail setting sparse though we
1697          * mark that server does not support sparse files for this share
1698          * to avoid repeatedly sending the unsupported fsctl to server
1699          * if the file is repeatedly extended.
1700          */
1701         if (tcon->broken_sparse_sup)
1702                 return false;
1703
1704         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1705                         cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
1706                         true /* is_fctl */,
1707                         &setsparse, 1, CIFSMaxBufSize, NULL, NULL);
1708         if (rc) {
1709                 tcon->broken_sparse_sup = true;
1710                 cifs_dbg(FYI, "set sparse rc = %d\n", rc);
1711                 return false;
1712         }
1713
1714         if (setsparse)
1715                 cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
1716         else
1717                 cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
1718
1719         return true;
1720 }
1721
1722 static int
1723 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
1724                    struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
1725 {
1726         __le64 eof = cpu_to_le64(size);
1727         struct inode *inode;
1728
1729         /*
1730          * If extending file more than one page make sparse. Many Linux fs
1731          * make files sparse by default when extending via ftruncate
1732          */
1733         inode = d_inode(cfile->dentry);
1734
1735         if (!set_alloc && (size > inode->i_size + 8192)) {
1736                 __u8 set_sparse = 1;
1737
1738                 /* whether set sparse succeeds or not, extend the file */
1739                 smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
1740         }
1741
1742         return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
1743                             cfile->fid.volatile_fid, cfile->pid, &eof);
1744 }
1745
1746 static int
1747 smb2_duplicate_extents(const unsigned int xid,
1748                         struct cifsFileInfo *srcfile,
1749                         struct cifsFileInfo *trgtfile, u64 src_off,
1750                         u64 len, u64 dest_off)
1751 {
1752         int rc;
1753         unsigned int ret_data_len;
1754         struct duplicate_extents_to_file dup_ext_buf;
1755         struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
1756
1757         /* server fileays advertise duplicate extent support with this flag */
1758         if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
1759              FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
1760                 return -EOPNOTSUPP;
1761
1762         dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
1763         dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
1764         dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
1765         dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
1766         dup_ext_buf.ByteCount = cpu_to_le64(len);
1767         cifs_dbg(FYI, "Duplicate extents: src off %lld dst off %lld len %lld\n",
1768                 src_off, dest_off, len);
1769
1770         rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
1771         if (rc)
1772                 goto duplicate_extents_out;
1773
1774         rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1775                         trgtfile->fid.volatile_fid,
1776                         FSCTL_DUPLICATE_EXTENTS_TO_FILE,
1777                         true /* is_fsctl */,
1778                         (char *)&dup_ext_buf,
1779                         sizeof(struct duplicate_extents_to_file),
1780                         CIFSMaxBufSize, NULL,
1781                         &ret_data_len);
1782
1783         if (ret_data_len > 0)
1784                 cifs_dbg(FYI, "Non-zero response length in duplicate extents\n");
1785
1786 duplicate_extents_out:
1787         return rc;
1788 }
1789
1790 static int
1791 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1792                    struct cifsFileInfo *cfile)
1793 {
1794         return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
1795                             cfile->fid.volatile_fid);
1796 }
1797
1798 static int
1799 smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
1800                    struct cifsFileInfo *cfile)
1801 {
1802         struct fsctl_set_integrity_information_req integr_info;
1803         unsigned int ret_data_len;
1804
1805         integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
1806         integr_info.Flags = 0;
1807         integr_info.Reserved = 0;
1808
1809         return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1810                         cfile->fid.volatile_fid,
1811                         FSCTL_SET_INTEGRITY_INFORMATION,
1812                         true /* is_fsctl */,
1813                         (char *)&integr_info,
1814                         sizeof(struct fsctl_set_integrity_information_req),
1815                         CIFSMaxBufSize, NULL,
1816                         &ret_data_len);
1817
1818 }
1819
1820 /* GMT Token is @GMT-YYYY.MM.DD-HH.MM.SS Unicode which is 48 bytes + null */
1821 #define GMT_TOKEN_SIZE 50
1822
1823 #define MIN_SNAPSHOT_ARRAY_SIZE 16 /* See MS-SMB2 section 3.3.5.15.1 */
1824
1825 /*
1826  * Input buffer contains (empty) struct smb_snapshot array with size filled in
1827  * For output see struct SRV_SNAPSHOT_ARRAY in MS-SMB2 section 2.2.32.2
1828  */
1829 static int
1830 smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
1831                    struct cifsFileInfo *cfile, void __user *ioc_buf)
1832 {
1833         char *retbuf = NULL;
1834         unsigned int ret_data_len = 0;
1835         int rc;
1836         u32 max_response_size;
1837         struct smb_snapshot_array snapshot_in;
1838
1839         /*
1840          * On the first query to enumerate the list of snapshots available
1841          * for this volume the buffer begins with 0 (number of snapshots
1842          * which can be returned is zero since at that point we do not know
1843          * how big the buffer needs to be). On the second query,
1844          * it (ret_data_len) is set to number of snapshots so we can
1845          * know to set the maximum response size larger (see below).
1846          */
1847         if (get_user(ret_data_len, (unsigned int __user *)ioc_buf))
1848                 return -EFAULT;
1849
1850         /*
1851          * Note that for snapshot queries that servers like Azure expect that
1852          * the first query be minimal size (and just used to get the number/size
1853          * of previous versions) so response size must be specified as EXACTLY
1854          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
1855          * of eight bytes.
1856          */
1857         if (ret_data_len == 0)
1858                 max_response_size = MIN_SNAPSHOT_ARRAY_SIZE;
1859         else
1860                 max_response_size = CIFSMaxBufSize;
1861
1862         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1863                         cfile->fid.volatile_fid,
1864                         FSCTL_SRV_ENUMERATE_SNAPSHOTS,
1865                         true /* is_fsctl */,
1866                         NULL, 0 /* no input data */, max_response_size,
1867                         (char **)&retbuf,
1868                         &ret_data_len);
1869         cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d\n",
1870                         rc, ret_data_len);
1871         if (rc)
1872                 return rc;
1873
1874         if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) {
1875                 /* Fixup buffer */
1876                 if (copy_from_user(&snapshot_in, ioc_buf,
1877                     sizeof(struct smb_snapshot_array))) {
1878                         rc = -EFAULT;
1879                         kfree(retbuf);
1880                         return rc;
1881                 }
1882
1883                 /*
1884                  * Check for min size, ie not large enough to fit even one GMT
1885                  * token (snapshot).  On the first ioctl some users may pass in
1886                  * smaller size (or zero) to simply get the size of the array
1887                  * so the user space caller can allocate sufficient memory
1888                  * and retry the ioctl again with larger array size sufficient
1889                  * to hold all of the snapshot GMT tokens on the second try.
1890                  */
1891                 if (snapshot_in.snapshot_array_size < GMT_TOKEN_SIZE)
1892                         ret_data_len = sizeof(struct smb_snapshot_array);
1893
1894                 /*
1895                  * We return struct SRV_SNAPSHOT_ARRAY, followed by
1896                  * the snapshot array (of 50 byte GMT tokens) each
1897                  * representing an available previous version of the data
1898                  */
1899                 if (ret_data_len > (snapshot_in.snapshot_array_size +
1900                                         sizeof(struct smb_snapshot_array)))
1901                         ret_data_len = snapshot_in.snapshot_array_size +
1902                                         sizeof(struct smb_snapshot_array);
1903
1904                 if (copy_to_user(ioc_buf, retbuf, ret_data_len))
1905                         rc = -EFAULT;
1906         }
1907
1908         kfree(retbuf);
1909         return rc;
1910 }
1911
1912 static int
1913 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
1914                      const char *path, struct cifs_sb_info *cifs_sb,
1915                      struct cifs_fid *fid, __u16 search_flags,
1916                      struct cifs_search_info *srch_inf)
1917 {
1918         __le16 *utf16_path;
1919         int rc;
1920         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1921         struct cifs_open_parms oparms;
1922
1923         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1924         if (!utf16_path)
1925                 return -ENOMEM;
1926
1927         oparms.tcon = tcon;
1928         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
1929         oparms.disposition = FILE_OPEN;
1930         if (backup_cred(cifs_sb))
1931                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1932         else
1933                 oparms.create_options = 0;
1934         oparms.fid = fid;
1935         oparms.reconnect = false;
1936
1937         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
1938         kfree(utf16_path);
1939         if (rc) {
1940                 cifs_dbg(FYI, "open dir failed rc=%d\n", rc);
1941                 return rc;
1942         }
1943
1944         srch_inf->entries_in_buffer = 0;
1945         srch_inf->index_of_last_entry = 2;
1946
1947         rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
1948                                   fid->volatile_fid, 0, srch_inf);
1949         if (rc) {
1950                 cifs_dbg(FYI, "query directory failed rc=%d\n", rc);
1951                 SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1952         }
1953         return rc;
1954 }
1955
1956 static int
1957 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
1958                     struct cifs_fid *fid, __u16 search_flags,
1959                     struct cifs_search_info *srch_inf)
1960 {
1961         return SMB2_query_directory(xid, tcon, fid->persistent_fid,
1962                                     fid->volatile_fid, 0, srch_inf);
1963 }
1964
1965 static int
1966 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
1967                struct cifs_fid *fid)
1968 {
1969         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1970 }
1971
1972 /*
1973  * If we negotiate SMB2 protocol and get STATUS_PENDING - update
1974  * the number of credits and return true. Otherwise - return false.
1975  */
1976 static bool
1977 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server)
1978 {
1979         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
1980
1981         if (shdr->Status != STATUS_PENDING)
1982                 return false;
1983
1984         if (shdr->CreditRequest) {
1985                 spin_lock(&server->req_lock);
1986                 server->credits += le16_to_cpu(shdr->CreditRequest);
1987                 spin_unlock(&server->req_lock);
1988                 wake_up(&server->request_q);
1989         }
1990
1991         return true;
1992 }
1993
1994 static bool
1995 smb2_is_session_expired(char *buf)
1996 {
1997         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
1998
1999         if (shdr->Status != STATUS_NETWORK_SESSION_EXPIRED &&
2000             shdr->Status != STATUS_USER_SESSION_DELETED)
2001                 return false;
2002
2003         trace_smb3_ses_expired(shdr->TreeId, shdr->SessionId,
2004                                le16_to_cpu(shdr->Command),
2005                                le64_to_cpu(shdr->MessageId));
2006         cifs_dbg(FYI, "Session expired or deleted\n");
2007
2008         return true;
2009 }
2010
2011 static int
2012 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
2013                      struct cifsInodeInfo *cinode)
2014 {
2015         if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
2016                 return SMB2_lease_break(0, tcon, cinode->lease_key,
2017                                         smb2_get_lease_state(cinode));
2018
2019         return SMB2_oplock_break(0, tcon, fid->persistent_fid,
2020                                  fid->volatile_fid,
2021                                  CIFS_CACHE_READ(cinode) ? 1 : 0);
2022 }
2023
2024 void
2025 smb2_set_related(struct smb_rqst *rqst)
2026 {
2027         struct smb2_sync_hdr *shdr;
2028
2029         shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
2030         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2031 }
2032
2033 char smb2_padding[7] = {0, 0, 0, 0, 0, 0, 0};
2034
2035 void
2036 smb2_set_next_command(struct cifs_tcon *tcon, struct smb_rqst *rqst)
2037 {
2038         struct smb2_sync_hdr *shdr;
2039         struct cifs_ses *ses = tcon->ses;
2040         struct TCP_Server_Info *server = ses->server;
2041         unsigned long len = smb_rqst_len(server, rqst);
2042         int i, num_padding;
2043
2044         /* SMB headers in a compound are 8 byte aligned. */
2045
2046         /* No padding needed */
2047         if (!(len & 7))
2048                 goto finished;
2049
2050         num_padding = 8 - (len & 7);
2051         if (!smb3_encryption_required(tcon)) {
2052                 /*
2053                  * If we do not have encryption then we can just add an extra
2054                  * iov for the padding.
2055                  */
2056                 rqst->rq_iov[rqst->rq_nvec].iov_base = smb2_padding;
2057                 rqst->rq_iov[rqst->rq_nvec].iov_len = num_padding;
2058                 rqst->rq_nvec++;
2059                 len += num_padding;
2060         } else {
2061                 /*
2062                  * We can not add a small padding iov for the encryption case
2063                  * because the encryption framework can not handle the padding
2064                  * iovs.
2065                  * We have to flatten this into a single buffer and add
2066                  * the padding to it.
2067                  */
2068                 for (i = 1; i < rqst->rq_nvec; i++) {
2069                         memcpy(rqst->rq_iov[0].iov_base +
2070                                rqst->rq_iov[0].iov_len,
2071                                rqst->rq_iov[i].iov_base,
2072                                rqst->rq_iov[i].iov_len);
2073                         rqst->rq_iov[0].iov_len += rqst->rq_iov[i].iov_len;
2074                 }
2075                 memset(rqst->rq_iov[0].iov_base + rqst->rq_iov[0].iov_len,
2076                        0, num_padding);
2077                 rqst->rq_iov[0].iov_len += num_padding;
2078                 len += num_padding;
2079                 rqst->rq_nvec = 1;
2080         }
2081
2082  finished:
2083         shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
2084         shdr->NextCommand = cpu_to_le32(len);
2085 }
2086
2087 /*
2088  * Passes the query info response back to the caller on success.
2089  * Caller need to free this with free_rsp_buf().
2090  */
2091 int
2092 smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
2093                          __le16 *utf16_path, u32 desired_access,
2094                          u32 class, u32 type, u32 output_len,
2095                          struct kvec *rsp, int *buftype,
2096                          struct cifs_sb_info *cifs_sb)
2097 {
2098         struct cifs_ses *ses = tcon->ses;
2099         int flags = 0;
2100         struct smb_rqst rqst[3];
2101         int resp_buftype[3];
2102         struct kvec rsp_iov[3];
2103         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2104         struct kvec qi_iov[1];
2105         struct kvec close_iov[1];
2106         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2107         struct cifs_open_parms oparms;
2108         struct cifs_fid fid;
2109         int rc;
2110
2111         if (smb3_encryption_required(tcon))
2112                 flags |= CIFS_TRANSFORM_REQ;
2113
2114         memset(rqst, 0, sizeof(rqst));
2115         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
2116         memset(rsp_iov, 0, sizeof(rsp_iov));
2117
2118         memset(&open_iov, 0, sizeof(open_iov));
2119         rqst[0].rq_iov = open_iov;
2120         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2121
2122         oparms.tcon = tcon;
2123         oparms.desired_access = desired_access;
2124         oparms.disposition = FILE_OPEN;
2125         if (cifs_sb && backup_cred(cifs_sb))
2126                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2127         else
2128                 oparms.create_options = 0;
2129         oparms.fid = &fid;
2130         oparms.reconnect = false;
2131
2132         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path);
2133         if (rc)
2134                 goto qic_exit;
2135         smb2_set_next_command(tcon, &rqst[0]);
2136
2137         memset(&qi_iov, 0, sizeof(qi_iov));
2138         rqst[1].rq_iov = qi_iov;
2139         rqst[1].rq_nvec = 1;
2140
2141         rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID, COMPOUND_FID,
2142                                   class, type, 0,
2143                                   output_len, 0,
2144                                   NULL);
2145         if (rc)
2146                 goto qic_exit;
2147         smb2_set_next_command(tcon, &rqst[1]);
2148         smb2_set_related(&rqst[1]);
2149
2150         memset(&close_iov, 0, sizeof(close_iov));
2151         rqst[2].rq_iov = close_iov;
2152         rqst[2].rq_nvec = 1;
2153
2154         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
2155         if (rc)
2156                 goto qic_exit;
2157         smb2_set_related(&rqst[2]);
2158
2159         rc = compound_send_recv(xid, ses, flags, 3, rqst,
2160                                 resp_buftype, rsp_iov);
2161         if (rc) {
2162                 free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2163                 goto qic_exit;
2164         }
2165         *rsp = rsp_iov[1];
2166         *buftype = resp_buftype[1];
2167
2168  qic_exit:
2169         SMB2_open_free(&rqst[0]);
2170         SMB2_query_info_free(&rqst[1]);
2171         SMB2_close_free(&rqst[2]);
2172         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2173         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
2174         return rc;
2175 }
2176
2177 static int
2178 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2179              struct kstatfs *buf)
2180 {
2181         struct smb2_query_info_rsp *rsp;
2182         struct smb2_fs_full_size_info *info = NULL;
2183         __le16 utf16_path = 0; /* Null - open root of share */
2184         struct kvec rsp_iov = {NULL, 0};
2185         int buftype = CIFS_NO_BUFFER;
2186         int rc;
2187
2188
2189         rc = smb2_query_info_compound(xid, tcon, &utf16_path,
2190                                       FILE_READ_ATTRIBUTES,
2191                                       FS_FULL_SIZE_INFORMATION,
2192                                       SMB2_O_INFO_FILESYSTEM,
2193                                       sizeof(struct smb2_fs_full_size_info),
2194                                       &rsp_iov, &buftype, NULL);
2195         if (rc)
2196                 goto qfs_exit;
2197
2198         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2199         buf->f_type = SMB2_MAGIC_NUMBER;
2200         info = (struct smb2_fs_full_size_info *)(
2201                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
2202         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
2203                                le32_to_cpu(rsp->OutputBufferLength),
2204                                &rsp_iov,
2205                                sizeof(struct smb2_fs_full_size_info));
2206         if (!rc)
2207                 smb2_copy_fs_info_to_kstatfs(info, buf);
2208
2209 qfs_exit:
2210         free_rsp_buf(buftype, rsp_iov.iov_base);
2211         return rc;
2212 }
2213
2214 static int
2215 smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2216              struct kstatfs *buf)
2217 {
2218         int rc;
2219         __le16 srch_path = 0; /* Null - open root of share */
2220         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2221         struct cifs_open_parms oparms;
2222         struct cifs_fid fid;
2223
2224         if (!tcon->posix_extensions)
2225                 return smb2_queryfs(xid, tcon, buf);
2226
2227         oparms.tcon = tcon;
2228         oparms.desired_access = FILE_READ_ATTRIBUTES;
2229         oparms.disposition = FILE_OPEN;
2230         oparms.create_options = 0;
2231         oparms.fid = &fid;
2232         oparms.reconnect = false;
2233
2234         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL, NULL);
2235         if (rc)
2236                 return rc;
2237
2238         rc = SMB311_posix_qfs_info(xid, tcon, fid.persistent_fid,
2239                                    fid.volatile_fid, buf);
2240         buf->f_type = SMB2_MAGIC_NUMBER;
2241         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2242         return rc;
2243 }
2244
2245 static bool
2246 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
2247 {
2248         return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
2249                ob1->fid.volatile_fid == ob2->fid.volatile_fid;
2250 }
2251
2252 static int
2253 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
2254                __u64 length, __u32 type, int lock, int unlock, bool wait)
2255 {
2256         if (unlock && !lock)
2257                 type = SMB2_LOCKFLAG_UNLOCK;
2258         return SMB2_lock(xid, tlink_tcon(cfile->tlink),
2259                          cfile->fid.persistent_fid, cfile->fid.volatile_fid,
2260                          current->tgid, length, offset, type, wait);
2261 }
2262
2263 static void
2264 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
2265 {
2266         memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
2267 }
2268
2269 static void
2270 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
2271 {
2272         memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
2273 }
2274
2275 static void
2276 smb2_new_lease_key(struct cifs_fid *fid)
2277 {
2278         generate_random_uuid(fid->lease_key);
2279 }
2280
2281 static int
2282 smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
2283                    const char *search_name,
2284                    struct dfs_info3_param **target_nodes,
2285                    unsigned int *num_of_nodes,
2286                    const struct nls_table *nls_codepage, int remap)
2287 {
2288         int rc;
2289         __le16 *utf16_path = NULL;
2290         int utf16_path_len = 0;
2291         struct cifs_tcon *tcon;
2292         struct fsctl_get_dfs_referral_req *dfs_req = NULL;
2293         struct get_dfs_referral_rsp *dfs_rsp = NULL;
2294         u32 dfs_req_size = 0, dfs_rsp_size = 0;
2295
2296         cifs_dbg(FYI, "%s: path: %s\n", __func__, search_name);
2297
2298         /*
2299          * Try to use the IPC tcon, otherwise just use any
2300          */
2301         tcon = ses->tcon_ipc;
2302         if (tcon == NULL) {
2303                 spin_lock(&cifs_tcp_ses_lock);
2304                 tcon = list_first_entry_or_null(&ses->tcon_list,
2305                                                 struct cifs_tcon,
2306                                                 tcon_list);
2307                 if (tcon)
2308                         tcon->tc_count++;
2309                 spin_unlock(&cifs_tcp_ses_lock);
2310         }
2311
2312         if (tcon == NULL) {
2313                 cifs_dbg(VFS, "session %p has no tcon available for a dfs referral request\n",
2314                          ses);
2315                 rc = -ENOTCONN;
2316                 goto out;
2317         }
2318
2319         utf16_path = cifs_strndup_to_utf16(search_name, PATH_MAX,
2320                                            &utf16_path_len,
2321                                            nls_codepage, remap);
2322         if (!utf16_path) {
2323                 rc = -ENOMEM;
2324                 goto out;
2325         }
2326
2327         dfs_req_size = sizeof(*dfs_req) + utf16_path_len;
2328         dfs_req = kzalloc(dfs_req_size, GFP_KERNEL);
2329         if (!dfs_req) {
2330                 rc = -ENOMEM;
2331                 goto out;
2332         }
2333
2334         /* Highest DFS referral version understood */
2335         dfs_req->MaxReferralLevel = DFS_VERSION;
2336
2337         /* Path to resolve in an UTF-16 null-terminated string */
2338         memcpy(dfs_req->RequestFileName, utf16_path, utf16_path_len);
2339
2340         do {
2341                 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
2342                                 FSCTL_DFS_GET_REFERRALS,
2343                                 true /* is_fsctl */,
2344                                 (char *)dfs_req, dfs_req_size, CIFSMaxBufSize,
2345                                 (char **)&dfs_rsp, &dfs_rsp_size);
2346         } while (rc == -EAGAIN);
2347
2348         if (rc) {
2349                 if ((rc != -ENOENT) && (rc != -EOPNOTSUPP))
2350                         cifs_dbg(VFS, "ioctl error in %s rc=%d\n", __func__, rc);
2351                 goto out;
2352         }
2353
2354         rc = parse_dfs_referrals(dfs_rsp, dfs_rsp_size,
2355                                  num_of_nodes, target_nodes,
2356                                  nls_codepage, remap, search_name,
2357                                  true /* is_unicode */);
2358         if (rc) {
2359                 cifs_dbg(VFS, "parse error in %s rc=%d\n", __func__, rc);
2360                 goto out;
2361         }
2362
2363  out:
2364         if (tcon && !tcon->ipc) {
2365                 /* ipc tcons are not refcounted */
2366                 spin_lock(&cifs_tcp_ses_lock);
2367                 tcon->tc_count--;
2368                 spin_unlock(&cifs_tcp_ses_lock);
2369         }
2370         kfree(utf16_path);
2371         kfree(dfs_req);
2372         kfree(dfs_rsp);
2373         return rc;
2374 }
2375
2376 static int
2377 parse_reparse_symlink(struct reparse_symlink_data_buffer *symlink_buf,
2378                       u32 plen, char **target_path,
2379                       struct cifs_sb_info *cifs_sb)
2380 {
2381         unsigned int sub_len;
2382         unsigned int sub_offset;
2383
2384         /* We only handle Symbolic Link : MS-FSCC 2.1.2.4 */
2385         if (le32_to_cpu(symlink_buf->ReparseTag) != IO_REPARSE_TAG_SYMLINK) {
2386                 cifs_dbg(VFS, "srv returned invalid symlink buffer\n");
2387                 return -EIO;
2388         }
2389
2390         sub_offset = le16_to_cpu(symlink_buf->SubstituteNameOffset);
2391         sub_len = le16_to_cpu(symlink_buf->SubstituteNameLength);
2392         if (sub_offset + 20 > plen ||
2393             sub_offset + sub_len + 20 > plen) {
2394                 cifs_dbg(VFS, "srv returned malformed symlink buffer\n");
2395                 return -EIO;
2396         }
2397
2398         *target_path = cifs_strndup_from_utf16(
2399                                 symlink_buf->PathBuffer + sub_offset,
2400                                 sub_len, true, cifs_sb->local_nls);
2401         if (!(*target_path))
2402                 return -ENOMEM;
2403
2404         convert_delimiter(*target_path, '/');
2405         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2406
2407         return 0;
2408 }
2409
2410 #define SMB2_SYMLINK_STRUCT_SIZE \
2411         (sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
2412
2413 static int
2414 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
2415                    struct cifs_sb_info *cifs_sb, const char *full_path,
2416                    char **target_path, bool is_reparse_point)
2417 {
2418         int rc;
2419         __le16 *utf16_path = NULL;
2420         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2421         struct cifs_open_parms oparms;
2422         struct cifs_fid fid;
2423         struct kvec err_iov = {NULL, 0};
2424         struct smb2_err_rsp *err_buf = NULL;
2425         struct smb2_symlink_err_rsp *symlink;
2426         unsigned int sub_len;
2427         unsigned int sub_offset;
2428         unsigned int print_len;
2429         unsigned int print_offset;
2430         int flags = 0;
2431         struct smb_rqst rqst[3];
2432         int resp_buftype[3];
2433         struct kvec rsp_iov[3];
2434         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2435         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
2436         struct kvec close_iov[1];
2437         struct smb2_create_rsp *create_rsp;
2438         struct smb2_ioctl_rsp *ioctl_rsp;
2439         struct reparse_data_buffer *reparse_buf;
2440         u32 plen;
2441
2442         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
2443
2444         *target_path = NULL;
2445
2446         if (smb3_encryption_required(tcon))
2447                 flags |= CIFS_TRANSFORM_REQ;
2448
2449         memset(rqst, 0, sizeof(rqst));
2450         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
2451         memset(rsp_iov, 0, sizeof(rsp_iov));
2452
2453         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2454         if (!utf16_path)
2455                 return -ENOMEM;
2456
2457         /* Open */
2458         memset(&open_iov, 0, sizeof(open_iov));
2459         rqst[0].rq_iov = open_iov;
2460         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2461
2462         memset(&oparms, 0, sizeof(oparms));
2463         oparms.tcon = tcon;
2464         oparms.desired_access = FILE_READ_ATTRIBUTES;
2465         oparms.disposition = FILE_OPEN;
2466
2467         if (backup_cred(cifs_sb))
2468                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2469         else
2470                 oparms.create_options = 0;
2471         if (is_reparse_point)
2472                 oparms.create_options = OPEN_REPARSE_POINT;
2473
2474         oparms.fid = &fid;
2475         oparms.reconnect = false;
2476
2477         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path);
2478         if (rc)
2479                 goto querty_exit;
2480         smb2_set_next_command(tcon, &rqst[0]);
2481
2482
2483         /* IOCTL */
2484         memset(&io_iov, 0, sizeof(io_iov));
2485         rqst[1].rq_iov = io_iov;
2486         rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
2487
2488         rc = SMB2_ioctl_init(tcon, &rqst[1], fid.persistent_fid,
2489                              fid.volatile_fid, FSCTL_GET_REPARSE_POINT,
2490                              true /* is_fctl */, NULL, 0, CIFSMaxBufSize);
2491         if (rc)
2492                 goto querty_exit;
2493
2494         smb2_set_next_command(tcon, &rqst[1]);
2495         smb2_set_related(&rqst[1]);
2496
2497
2498         /* Close */
2499         memset(&close_iov, 0, sizeof(close_iov));
2500         rqst[2].rq_iov = close_iov;
2501         rqst[2].rq_nvec = 1;
2502
2503         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
2504         if (rc)
2505                 goto querty_exit;
2506
2507         smb2_set_related(&rqst[2]);
2508
2509         rc = compound_send_recv(xid, tcon->ses, flags, 3, rqst,
2510                                 resp_buftype, rsp_iov);
2511
2512         create_rsp = rsp_iov[0].iov_base;
2513         if (create_rsp && create_rsp->sync_hdr.Status)
2514                 err_iov = rsp_iov[0];
2515         ioctl_rsp = rsp_iov[1].iov_base;
2516
2517         /*
2518          * Open was successful and we got an ioctl response.
2519          */
2520         if ((rc == 0) && (is_reparse_point)) {
2521                 /* See MS-FSCC 2.3.23 */
2522
2523                 reparse_buf = (struct reparse_data_buffer *)
2524                         ((char *)ioctl_rsp +
2525                          le32_to_cpu(ioctl_rsp->OutputOffset));
2526                 plen = le32_to_cpu(ioctl_rsp->OutputCount);
2527
2528                 if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) >
2529                     rsp_iov[1].iov_len) {
2530                         cifs_dbg(VFS, "srv returned invalid ioctl len: %d\n",
2531                                  plen);
2532                         rc = -EIO;
2533                         goto querty_exit;
2534                 }
2535
2536                 if (plen < 8) {
2537                         cifs_dbg(VFS, "reparse buffer is too small. Must be "
2538                                  "at least 8 bytes but was %d\n", plen);
2539                         rc = -EIO;
2540                         goto querty_exit;
2541                 }
2542
2543                 if (plen < le16_to_cpu(reparse_buf->ReparseDataLength) + 8) {
2544                         cifs_dbg(VFS, "srv returned invalid reparse buf "
2545                                  "length: %d\n", plen);
2546                         rc = -EIO;
2547                         goto querty_exit;
2548                 }
2549
2550                 rc = parse_reparse_symlink(
2551                         (struct reparse_symlink_data_buffer *)reparse_buf,
2552                         plen, target_path, cifs_sb);
2553                 goto querty_exit;
2554         }
2555
2556         if (!rc || !err_iov.iov_base) {
2557                 rc = -ENOENT;
2558                 goto querty_exit;
2559         }
2560
2561         err_buf = err_iov.iov_base;
2562         if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
2563             err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE) {
2564                 rc = -ENOENT;
2565                 goto querty_exit;
2566         }
2567
2568         /* open must fail on symlink - reset rc */
2569         rc = 0;
2570         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
2571         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
2572         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
2573         print_len = le16_to_cpu(symlink->PrintNameLength);
2574         print_offset = le16_to_cpu(symlink->PrintNameOffset);
2575
2576         if (err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
2577                 rc = -ENOENT;
2578                 goto querty_exit;
2579         }
2580
2581         if (err_iov.iov_len <
2582             SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
2583                 rc = -ENOENT;
2584                 goto querty_exit;
2585         }
2586
2587         *target_path = cifs_strndup_from_utf16(
2588                                 (char *)symlink->PathBuffer + sub_offset,
2589                                 sub_len, true, cifs_sb->local_nls);
2590         if (!(*target_path)) {
2591                 rc = -ENOMEM;
2592                 goto querty_exit;
2593         }
2594         convert_delimiter(*target_path, '/');
2595         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2596
2597  querty_exit:
2598         cifs_dbg(FYI, "query symlink rc %d\n", rc);
2599         kfree(utf16_path);
2600         SMB2_open_free(&rqst[0]);
2601         SMB2_ioctl_free(&rqst[1]);
2602         SMB2_close_free(&rqst[2]);
2603         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2604         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2605         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
2606         return rc;
2607 }
2608
2609 #ifdef CONFIG_CIFS_ACL
2610 static struct cifs_ntsd *
2611 get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
2612                 const struct cifs_fid *cifsfid, u32 *pacllen)
2613 {
2614         struct cifs_ntsd *pntsd = NULL;
2615         unsigned int xid;
2616         int rc = -EOPNOTSUPP;
2617         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2618
2619         if (IS_ERR(tlink))
2620                 return ERR_CAST(tlink);
2621
2622         xid = get_xid();
2623         cifs_dbg(FYI, "trying to get acl\n");
2624
2625         rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
2626                             cifsfid->volatile_fid, (void **)&pntsd, pacllen);
2627         free_xid(xid);
2628
2629         cifs_put_tlink(tlink);
2630
2631         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
2632         if (rc)
2633                 return ERR_PTR(rc);
2634         return pntsd;
2635
2636 }
2637
2638 static struct cifs_ntsd *
2639 get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
2640                 const char *path, u32 *pacllen)
2641 {
2642         struct cifs_ntsd *pntsd = NULL;
2643         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2644         unsigned int xid;
2645         int rc;
2646         struct cifs_tcon *tcon;
2647         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2648         struct cifs_fid fid;
2649         struct cifs_open_parms oparms;
2650         __le16 *utf16_path;
2651
2652         cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
2653         if (IS_ERR(tlink))
2654                 return ERR_CAST(tlink);
2655
2656         tcon = tlink_tcon(tlink);
2657         xid = get_xid();
2658
2659         if (backup_cred(cifs_sb))
2660                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2661         else
2662                 oparms.create_options = 0;
2663
2664         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2665         if (!utf16_path) {
2666                 rc = -ENOMEM;
2667                 free_xid(xid);
2668                 return ERR_PTR(rc);
2669         }
2670
2671         oparms.tcon = tcon;
2672         oparms.desired_access = READ_CONTROL;
2673         oparms.disposition = FILE_OPEN;
2674         oparms.fid = &fid;
2675         oparms.reconnect = false;
2676
2677         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
2678         kfree(utf16_path);
2679         if (!rc) {
2680                 rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
2681                             fid.volatile_fid, (void **)&pntsd, pacllen);
2682                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2683         }
2684
2685         cifs_put_tlink(tlink);
2686         free_xid(xid);
2687
2688         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
2689         if (rc)
2690                 return ERR_PTR(rc);
2691         return pntsd;
2692 }
2693
2694 #ifdef CONFIG_CIFS_ACL
2695 static int
2696 set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
2697                 struct inode *inode, const char *path, int aclflag)
2698 {
2699         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2700         unsigned int xid;
2701         int rc, access_flags = 0;
2702         struct cifs_tcon *tcon;
2703         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2704         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2705         struct cifs_fid fid;
2706         struct cifs_open_parms oparms;
2707         __le16 *utf16_path;
2708
2709         cifs_dbg(FYI, "set smb3 acl for path %s\n", path);
2710         if (IS_ERR(tlink))
2711                 return PTR_ERR(tlink);
2712
2713         tcon = tlink_tcon(tlink);
2714         xid = get_xid();
2715
2716         if (backup_cred(cifs_sb))
2717                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2718         else
2719                 oparms.create_options = 0;
2720
2721         if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP)
2722                 access_flags = WRITE_OWNER;
2723         else
2724                 access_flags = WRITE_DAC;
2725
2726         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2727         if (!utf16_path) {
2728                 rc = -ENOMEM;
2729                 free_xid(xid);
2730                 return rc;
2731         }
2732
2733         oparms.tcon = tcon;
2734         oparms.desired_access = access_flags;
2735         oparms.disposition = FILE_OPEN;
2736         oparms.path = path;
2737         oparms.fid = &fid;
2738         oparms.reconnect = false;
2739
2740         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
2741         kfree(utf16_path);
2742         if (!rc) {
2743                 rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
2744                             fid.volatile_fid, pnntsd, acllen, aclflag);
2745                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2746         }
2747
2748         cifs_put_tlink(tlink);
2749         free_xid(xid);
2750         return rc;
2751 }
2752 #endif /* CIFS_ACL */
2753
2754 /* Retrieve an ACL from the server */
2755 static struct cifs_ntsd *
2756 get_smb2_acl(struct cifs_sb_info *cifs_sb,
2757                                       struct inode *inode, const char *path,
2758                                       u32 *pacllen)
2759 {
2760         struct cifs_ntsd *pntsd = NULL;
2761         struct cifsFileInfo *open_file = NULL;
2762
2763         if (inode)
2764                 open_file = find_readable_file(CIFS_I(inode), true);
2765         if (!open_file)
2766                 return get_smb2_acl_by_path(cifs_sb, path, pacllen);
2767
2768         pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen);
2769         cifsFileInfo_put(open_file);
2770         return pntsd;
2771 }
2772 #endif
2773
2774 static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
2775                             loff_t offset, loff_t len, bool keep_size)
2776 {
2777         struct cifs_ses *ses = tcon->ses;
2778         struct inode *inode;
2779         struct cifsInodeInfo *cifsi;
2780         struct cifsFileInfo *cfile = file->private_data;
2781         struct file_zero_data_information fsctl_buf;
2782         long rc;
2783         unsigned int xid;
2784         __le64 eof;
2785
2786         xid = get_xid();
2787
2788         inode = d_inode(cfile->dentry);
2789         cifsi = CIFS_I(inode);
2790
2791         trace_smb3_zero_enter(xid, cfile->fid.persistent_fid, tcon->tid,
2792                               ses->Suid, offset, len);
2793
2794
2795         /* if file not oplocked can't be sure whether asking to extend size */
2796         if (!CIFS_CACHE_READ(cifsi))
2797                 if (keep_size == false) {
2798                         rc = -EOPNOTSUPP;
2799                         trace_smb3_zero_err(xid, cfile->fid.persistent_fid,
2800                                 tcon->tid, ses->Suid, offset, len, rc);
2801                         free_xid(xid);
2802                         return rc;
2803                 }
2804
2805         cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
2806
2807         fsctl_buf.FileOffset = cpu_to_le64(offset);
2808         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
2809
2810         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
2811                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA, true,
2812                         (char *)&fsctl_buf,
2813                         sizeof(struct file_zero_data_information),
2814                         0, NULL, NULL);
2815         if (rc)
2816                 goto zero_range_exit;
2817
2818         /*
2819          * do we also need to change the size of the file?
2820          */
2821         if (keep_size == false && i_size_read(inode) < offset + len) {
2822                 eof = cpu_to_le64(offset + len);
2823                 rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
2824                                   cfile->fid.volatile_fid, cfile->pid, &eof);
2825         }
2826
2827  zero_range_exit:
2828         free_xid(xid);
2829         if (rc)
2830                 trace_smb3_zero_err(xid, cfile->fid.persistent_fid, tcon->tid,
2831                               ses->Suid, offset, len, rc);
2832         else
2833                 trace_smb3_zero_done(xid, cfile->fid.persistent_fid, tcon->tid,
2834                               ses->Suid, offset, len);
2835         return rc;
2836 }
2837
2838 static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
2839                             loff_t offset, loff_t len)
2840 {
2841         struct inode *inode;
2842         struct cifsInodeInfo *cifsi;
2843         struct cifsFileInfo *cfile = file->private_data;
2844         struct file_zero_data_information fsctl_buf;
2845         long rc;
2846         unsigned int xid;
2847         __u8 set_sparse = 1;
2848
2849         xid = get_xid();
2850
2851         inode = d_inode(cfile->dentry);
2852         cifsi = CIFS_I(inode);
2853
2854         /* Need to make file sparse, if not already, before freeing range. */
2855         /* Consider adding equivalent for compressed since it could also work */
2856         if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse)) {
2857                 rc = -EOPNOTSUPP;
2858                 free_xid(xid);
2859                 return rc;
2860         }
2861
2862         cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
2863
2864         fsctl_buf.FileOffset = cpu_to_le64(offset);
2865         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
2866
2867         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
2868                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
2869                         true /* is_fctl */, (char *)&fsctl_buf,
2870                         sizeof(struct file_zero_data_information),
2871                         CIFSMaxBufSize, NULL, NULL);
2872         free_xid(xid);
2873         return rc;
2874 }
2875
2876 static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
2877                             loff_t off, loff_t len, bool keep_size)
2878 {
2879         struct inode *inode;
2880         struct cifsInodeInfo *cifsi;
2881         struct cifsFileInfo *cfile = file->private_data;
2882         long rc = -EOPNOTSUPP;
2883         unsigned int xid;
2884         __le64 eof;
2885
2886         xid = get_xid();
2887
2888         inode = d_inode(cfile->dentry);
2889         cifsi = CIFS_I(inode);
2890
2891         trace_smb3_falloc_enter(xid, cfile->fid.persistent_fid, tcon->tid,
2892                                 tcon->ses->Suid, off, len);
2893         /* if file not oplocked can't be sure whether asking to extend size */
2894         if (!CIFS_CACHE_READ(cifsi))
2895                 if (keep_size == false) {
2896                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
2897                                 tcon->tid, tcon->ses->Suid, off, len, rc);
2898                         free_xid(xid);
2899                         return rc;
2900                 }
2901
2902         /*
2903          * Files are non-sparse by default so falloc may be a no-op
2904          * Must check if file sparse. If not sparse, and not extending
2905          * then no need to do anything since file already allocated
2906          */
2907         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
2908                 if (keep_size == true)
2909                         rc = 0;
2910                 /* check if extending file */
2911                 else if (i_size_read(inode) >= off + len)
2912                         /* not extending file and already not sparse */
2913                         rc = 0;
2914                 /* BB: in future add else clause to extend file */
2915                 else
2916                         rc = -EOPNOTSUPP;
2917                 if (rc)
2918                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
2919                                 tcon->tid, tcon->ses->Suid, off, len, rc);
2920                 else
2921                         trace_smb3_falloc_done(xid, cfile->fid.persistent_fid,
2922                                 tcon->tid, tcon->ses->Suid, off, len);
2923                 free_xid(xid);
2924                 return rc;
2925         }
2926
2927         if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
2928                 /*
2929                  * Check if falloc starts within first few pages of file
2930                  * and ends within a few pages of the end of file to
2931                  * ensure that most of file is being forced to be
2932                  * fallocated now. If so then setting whole file sparse
2933                  * ie potentially making a few extra pages at the beginning
2934                  * or end of the file non-sparse via set_sparse is harmless.
2935                  */
2936                 if ((off > 8192) || (off + len + 8192 < i_size_read(inode))) {
2937                         rc = -EOPNOTSUPP;
2938                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
2939                                 tcon->tid, tcon->ses->Suid, off, len, rc);
2940                         free_xid(xid);
2941                         return rc;
2942                 }
2943
2944                 smb2_set_sparse(xid, tcon, cfile, inode, false);
2945                 rc = 0;
2946         } else {
2947                 smb2_set_sparse(xid, tcon, cfile, inode, false);
2948                 rc = 0;
2949                 if (i_size_read(inode) < off + len) {
2950                         eof = cpu_to_le64(off + len);
2951                         rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
2952                                           cfile->fid.volatile_fid, cfile->pid,
2953                                           &eof);
2954                 }
2955         }
2956
2957         if (rc)
2958                 trace_smb3_falloc_err(xid, cfile->fid.persistent_fid, tcon->tid,
2959                                 tcon->ses->Suid, off, len, rc);
2960         else
2961                 trace_smb3_falloc_done(xid, cfile->fid.persistent_fid, tcon->tid,
2962                                 tcon->ses->Suid, off, len);
2963
2964         free_xid(xid);
2965         return rc;
2966 }
2967
2968 static loff_t smb3_llseek(struct file *file, struct cifs_tcon *tcon, loff_t offset, int whence)
2969 {
2970         struct cifsFileInfo *wrcfile, *cfile = file->private_data;
2971         struct cifsInodeInfo *cifsi;
2972         struct inode *inode;
2973         int rc = 0;
2974         struct file_allocated_range_buffer in_data, *out_data = NULL;
2975         u32 out_data_len;
2976         unsigned int xid;
2977
2978         if (whence != SEEK_HOLE && whence != SEEK_DATA)
2979                 return generic_file_llseek(file, offset, whence);
2980
2981         inode = d_inode(cfile->dentry);
2982         cifsi = CIFS_I(inode);
2983
2984         if (offset < 0 || offset >= i_size_read(inode))
2985                 return -ENXIO;
2986
2987         xid = get_xid();
2988         /*
2989          * We need to be sure that all dirty pages are written as they
2990          * might fill holes on the server.
2991          * Note that we also MUST flush any written pages since at least
2992          * some servers (Windows2016) will not reflect recent writes in
2993          * QUERY_ALLOCATED_RANGES until SMB2_flush is called.
2994          */
2995         wrcfile = find_writable_file(cifsi, false);
2996         if (wrcfile) {
2997                 filemap_write_and_wait(inode->i_mapping);
2998                 smb2_flush_file(xid, tcon, &wrcfile->fid);
2999                 cifsFileInfo_put(wrcfile);
3000         }
3001
3002         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE)) {
3003                 if (whence == SEEK_HOLE)
3004                         offset = i_size_read(inode);
3005                 goto lseek_exit;
3006         }
3007
3008         in_data.file_offset = cpu_to_le64(offset);
3009         in_data.length = cpu_to_le64(i_size_read(inode));
3010
3011         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3012                         cfile->fid.volatile_fid,
3013                         FSCTL_QUERY_ALLOCATED_RANGES, true,
3014                         (char *)&in_data, sizeof(in_data),
3015                         sizeof(struct file_allocated_range_buffer),
3016                         (char **)&out_data, &out_data_len);
3017         if (rc == -E2BIG)
3018                 rc = 0;
3019         if (rc)
3020                 goto lseek_exit;
3021
3022         if (whence == SEEK_HOLE && out_data_len == 0)
3023                 goto lseek_exit;
3024
3025         if (whence == SEEK_DATA && out_data_len == 0) {
3026                 rc = -ENXIO;
3027                 goto lseek_exit;
3028         }
3029
3030         if (out_data_len < sizeof(struct file_allocated_range_buffer)) {
3031                 rc = -EINVAL;
3032                 goto lseek_exit;
3033         }
3034         if (whence == SEEK_DATA) {
3035                 offset = le64_to_cpu(out_data->file_offset);
3036                 goto lseek_exit;
3037         }
3038         if (offset < le64_to_cpu(out_data->file_offset))
3039                 goto lseek_exit;
3040
3041         offset = le64_to_cpu(out_data->file_offset) + le64_to_cpu(out_data->length);
3042
3043  lseek_exit:
3044         free_xid(xid);
3045         kfree(out_data);
3046         if (!rc)
3047                 return vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
3048         else
3049                 return rc;
3050 }
3051
3052 static int smb3_fiemap(struct cifs_tcon *tcon,
3053                        struct cifsFileInfo *cfile,
3054                        struct fiemap_extent_info *fei, u64 start, u64 len)
3055 {
3056         unsigned int xid;
3057         struct file_allocated_range_buffer in_data, *out_data;
3058         u32 out_data_len;
3059         int i, num, rc, flags, last_blob;
3060         u64 next;
3061
3062         if (fiemap_check_flags(fei, FIEMAP_FLAG_SYNC))
3063                 return -EBADR;
3064
3065         xid = get_xid();
3066  again:
3067         in_data.file_offset = cpu_to_le64(start);
3068         in_data.length = cpu_to_le64(len);
3069
3070         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3071                         cfile->fid.volatile_fid,
3072                         FSCTL_QUERY_ALLOCATED_RANGES, true,
3073                         (char *)&in_data, sizeof(in_data),
3074                         1024 * sizeof(struct file_allocated_range_buffer),
3075                         (char **)&out_data, &out_data_len);
3076         if (rc == -E2BIG) {
3077                 last_blob = 0;
3078                 rc = 0;
3079         } else
3080                 last_blob = 1;
3081         if (rc)
3082                 goto out;
3083
3084         if (out_data_len < sizeof(struct file_allocated_range_buffer)) {
3085                 rc = -EINVAL;
3086                 goto out;
3087         }
3088         if (out_data_len % sizeof(struct file_allocated_range_buffer)) {
3089                 rc = -EINVAL;
3090                 goto out;
3091         }
3092
3093         num = out_data_len / sizeof(struct file_allocated_range_buffer);
3094         for (i = 0; i < num; i++) {
3095                 flags = 0;
3096                 if (i == num - 1 && last_blob)
3097                         flags |= FIEMAP_EXTENT_LAST;
3098
3099                 rc = fiemap_fill_next_extent(fei,
3100                                 le64_to_cpu(out_data[i].file_offset),
3101                                 le64_to_cpu(out_data[i].file_offset),
3102                                 le64_to_cpu(out_data[i].length),
3103                                 flags);
3104                 if (rc < 0)
3105                         goto out;
3106                 if (rc == 1) {
3107                         rc = 0;
3108                         goto out;
3109                 }
3110         }
3111
3112         if (!last_blob) {
3113                 next = le64_to_cpu(out_data[num - 1].file_offset) +
3114                   le64_to_cpu(out_data[num - 1].length);
3115                 len = len - (next - start);
3116                 start = next;
3117                 goto again;
3118         }
3119
3120  out:
3121         free_xid(xid);
3122         kfree(out_data);
3123         return rc;
3124 }
3125
3126 static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
3127                            loff_t off, loff_t len)
3128 {
3129         /* KEEP_SIZE already checked for by do_fallocate */
3130         if (mode & FALLOC_FL_PUNCH_HOLE)
3131                 return smb3_punch_hole(file, tcon, off, len);
3132         else if (mode & FALLOC_FL_ZERO_RANGE) {
3133                 if (mode & FALLOC_FL_KEEP_SIZE)
3134                         return smb3_zero_range(file, tcon, off, len, true);
3135                 return smb3_zero_range(file, tcon, off, len, false);
3136         } else if (mode == FALLOC_FL_KEEP_SIZE)
3137                 return smb3_simple_falloc(file, tcon, off, len, true);
3138         else if (mode == 0)
3139                 return smb3_simple_falloc(file, tcon, off, len, false);
3140
3141         return -EOPNOTSUPP;
3142 }
3143
3144 static void
3145 smb2_downgrade_oplock(struct TCP_Server_Info *server,
3146                         struct cifsInodeInfo *cinode, bool set_level2)
3147 {
3148         if (set_level2)
3149                 server->ops->set_oplock_level(cinode, SMB2_OPLOCK_LEVEL_II,
3150                                                 0, NULL);
3151         else
3152                 server->ops->set_oplock_level(cinode, 0, 0, NULL);
3153 }
3154
3155 static void
3156 smb21_downgrade_oplock(struct TCP_Server_Info *server,
3157                        struct cifsInodeInfo *cinode, bool set_level2)
3158 {
3159         server->ops->set_oplock_level(cinode,
3160                                       set_level2 ? SMB2_LEASE_READ_CACHING_HE :
3161                                       0, 0, NULL);
3162 }
3163
3164 static void
3165 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3166                       unsigned int epoch, bool *purge_cache)
3167 {
3168         oplock &= 0xFF;
3169         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
3170                 return;
3171         if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
3172                 cinode->oplock = CIFS_CACHE_RHW_FLG;
3173                 cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
3174                          &cinode->vfs_inode);
3175         } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
3176                 cinode->oplock = CIFS_CACHE_RW_FLG;
3177                 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
3178                          &cinode->vfs_inode);
3179         } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
3180                 cinode->oplock = CIFS_CACHE_READ_FLG;
3181                 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
3182                          &cinode->vfs_inode);
3183         } else
3184                 cinode->oplock = 0;
3185 }
3186
3187 static void
3188 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3189                        unsigned int epoch, bool *purge_cache)
3190 {
3191         char message[5] = {0};
3192         unsigned int new_oplock = 0;
3193
3194         oplock &= 0xFF;
3195         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
3196                 return;
3197
3198         if (oplock & SMB2_LEASE_READ_CACHING_HE) {
3199                 new_oplock |= CIFS_CACHE_READ_FLG;
3200                 strcat(message, "R");
3201         }
3202         if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
3203                 new_oplock |= CIFS_CACHE_HANDLE_FLG;
3204                 strcat(message, "H");
3205         }
3206         if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
3207                 new_oplock |= CIFS_CACHE_WRITE_FLG;
3208                 strcat(message, "W");
3209         }
3210         if (!new_oplock)
3211                 strncpy(message, "None", sizeof(message));
3212
3213         cinode->oplock = new_oplock;
3214         cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
3215                  &cinode->vfs_inode);
3216 }
3217
3218 static void
3219 smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3220                       unsigned int epoch, bool *purge_cache)
3221 {
3222         unsigned int old_oplock = cinode->oplock;
3223
3224         smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
3225
3226         if (purge_cache) {
3227                 *purge_cache = false;
3228                 if (old_oplock == CIFS_CACHE_READ_FLG) {
3229                         if (cinode->oplock == CIFS_CACHE_READ_FLG &&
3230                             (epoch - cinode->epoch > 0))
3231                                 *purge_cache = true;
3232                         else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
3233                                  (epoch - cinode->epoch > 1))
3234                                 *purge_cache = true;
3235                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
3236                                  (epoch - cinode->epoch > 1))
3237                                 *purge_cache = true;
3238                         else if (cinode->oplock == 0 &&
3239                                  (epoch - cinode->epoch > 0))
3240                                 *purge_cache = true;
3241                 } else if (old_oplock == CIFS_CACHE_RH_FLG) {
3242                         if (cinode->oplock == CIFS_CACHE_RH_FLG &&
3243                             (epoch - cinode->epoch > 0))
3244                                 *purge_cache = true;
3245                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
3246                                  (epoch - cinode->epoch > 1))
3247                                 *purge_cache = true;
3248                 }
3249                 cinode->epoch = epoch;
3250         }
3251 }
3252
3253 static bool
3254 smb2_is_read_op(__u32 oplock)
3255 {
3256         return oplock == SMB2_OPLOCK_LEVEL_II;
3257 }
3258
3259 static bool
3260 smb21_is_read_op(__u32 oplock)
3261 {
3262         return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
3263                !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
3264 }
3265
3266 static __le32
3267 map_oplock_to_lease(u8 oplock)
3268 {
3269         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
3270                 return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
3271         else if (oplock == SMB2_OPLOCK_LEVEL_II)
3272                 return SMB2_LEASE_READ_CACHING;
3273         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
3274                 return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
3275                        SMB2_LEASE_WRITE_CACHING;
3276         return 0;
3277 }
3278
3279 static char *
3280 smb2_create_lease_buf(u8 *lease_key, u8 oplock)
3281 {
3282         struct create_lease *buf;
3283
3284         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
3285         if (!buf)
3286                 return NULL;
3287
3288         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
3289         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
3290
3291         buf->ccontext.DataOffset = cpu_to_le16(offsetof
3292                                         (struct create_lease, lcontext));
3293         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
3294         buf->ccontext.NameOffset = cpu_to_le16(offsetof
3295                                 (struct create_lease, Name));
3296         buf->ccontext.NameLength = cpu_to_le16(4);
3297         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
3298         buf->Name[0] = 'R';
3299         buf->Name[1] = 'q';
3300         buf->Name[2] = 'L';
3301         buf->Name[3] = 's';
3302         return (char *)buf;
3303 }
3304
3305 static char *
3306 smb3_create_lease_buf(u8 *lease_key, u8 oplock)
3307 {
3308         struct create_lease_v2 *buf;
3309
3310         buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
3311         if (!buf)
3312                 return NULL;
3313
3314         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
3315         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
3316
3317         buf->ccontext.DataOffset = cpu_to_le16(offsetof
3318                                         (struct create_lease_v2, lcontext));
3319         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
3320         buf->ccontext.NameOffset = cpu_to_le16(offsetof
3321                                 (struct create_lease_v2, Name));
3322         buf->ccontext.NameLength = cpu_to_le16(4);
3323         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
3324         buf->Name[0] = 'R';
3325         buf->Name[1] = 'q';
3326         buf->Name[2] = 'L';
3327         buf->Name[3] = 's';
3328         return (char *)buf;
3329 }
3330
3331 static __u8
3332 smb2_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
3333 {
3334         struct create_lease *lc = (struct create_lease *)buf;
3335
3336         *epoch = 0; /* not used */
3337         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
3338                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
3339         return le32_to_cpu(lc->lcontext.LeaseState);
3340 }
3341
3342 static __u8
3343 smb3_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
3344 {
3345         struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
3346
3347         *epoch = le16_to_cpu(lc->lcontext.Epoch);
3348         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
3349                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
3350         if (lease_key)
3351                 memcpy(lease_key, &lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
3352         return le32_to_cpu(lc->lcontext.LeaseState);
3353 }
3354
3355 static unsigned int
3356 smb2_wp_retry_size(struct inode *inode)
3357 {
3358         return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
3359                      SMB2_MAX_BUFFER_SIZE);
3360 }
3361
3362 static bool
3363 smb2_dir_needs_close(struct cifsFileInfo *cfile)
3364 {
3365         return !cfile->invalidHandle;
3366 }
3367
3368 static void
3369 fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, unsigned int orig_len,
3370                    struct smb_rqst *old_rq)
3371 {
3372         struct smb2_sync_hdr *shdr =
3373                         (struct smb2_sync_hdr *)old_rq->rq_iov[0].iov_base;
3374
3375         memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
3376         tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
3377         tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
3378         tr_hdr->Flags = cpu_to_le16(0x01);
3379         get_random_bytes(&tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
3380         memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
3381 }
3382
3383 /* We can not use the normal sg_set_buf() as we will sometimes pass a
3384  * stack object as buf.
3385  */
3386 static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf,
3387                                    unsigned int buflen)
3388 {
3389         sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
3390 }
3391
3392 /* Assumes the first rqst has a transform header as the first iov.
3393  * I.e.
3394  * rqst[0].rq_iov[0]  is transform header
3395  * rqst[0].rq_iov[1+] data to be encrypted/decrypted
3396  * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
3397  */
3398 static struct scatterlist *
3399 init_sg(int num_rqst, struct smb_rqst *rqst, u8 *sign)
3400 {
3401         unsigned int sg_len;
3402         struct scatterlist *sg;
3403         unsigned int i;
3404         unsigned int j;
3405         unsigned int idx = 0;
3406         int skip;
3407
3408         sg_len = 1;
3409         for (i = 0; i < num_rqst; i++)
3410                 sg_len += rqst[i].rq_nvec + rqst[i].rq_npages;
3411
3412         sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
3413         if (!sg)
3414                 return NULL;
3415
3416         sg_init_table(sg, sg_len);
3417         for (i = 0; i < num_rqst; i++) {
3418                 for (j = 0; j < rqst[i].rq_nvec; j++) {
3419                         /*
3420                          * The first rqst has a transform header where the
3421                          * first 20 bytes are not part of the encrypted blob
3422                          */
3423                         skip = (i == 0) && (j == 0) ? 20 : 0;
3424                         smb2_sg_set_buf(&sg[idx++],
3425                                         rqst[i].rq_iov[j].iov_base + skip,
3426                                         rqst[i].rq_iov[j].iov_len - skip);
3427                         }
3428
3429                 for (j = 0; j < rqst[i].rq_npages; j++) {
3430                         unsigned int len, offset;
3431
3432                         rqst_page_get_length(&rqst[i], j, &len, &offset);
3433                         sg_set_page(&sg[idx++], rqst[i].rq_pages[j], len, offset);
3434                 }
3435         }
3436         smb2_sg_set_buf(&sg[idx], sign, SMB2_SIGNATURE_SIZE);
3437         return sg;
3438 }
3439
3440 static int
3441 smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
3442 {
3443         struct cifs_ses *ses;
3444         u8 *ses_enc_key;
3445
3446         spin_lock(&cifs_tcp_ses_lock);
3447         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3448                 if (ses->Suid != ses_id)
3449                         continue;
3450                 ses_enc_key = enc ? ses->smb3encryptionkey :
3451                                                         ses->smb3decryptionkey;
3452                 memcpy(key, ses_enc_key, SMB3_SIGN_KEY_SIZE);
3453                 spin_unlock(&cifs_tcp_ses_lock);
3454                 return 0;
3455         }
3456         spin_unlock(&cifs_tcp_ses_lock);
3457
3458         return 1;
3459 }
3460 /*
3461  * Encrypt or decrypt @rqst message. @rqst[0] has the following format:
3462  * iov[0]   - transform header (associate data),
3463  * iov[1-N] - SMB2 header and pages - data to encrypt.
3464  * On success return encrypted data in iov[1-N] and pages, leave iov[0]
3465  * untouched.
3466  */
3467 static int
3468 crypt_message(struct TCP_Server_Info *server, int num_rqst,
3469               struct smb_rqst *rqst, int enc)
3470 {
3471         struct smb2_transform_hdr *tr_hdr =
3472                 (struct smb2_transform_hdr *)rqst[0].rq_iov[0].iov_base;
3473         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
3474         int rc = 0;
3475         struct scatterlist *sg;
3476         u8 sign[SMB2_SIGNATURE_SIZE] = {};
3477         u8 key[SMB3_SIGN_KEY_SIZE];
3478         struct aead_request *req;
3479         char *iv;
3480         unsigned int iv_len;
3481         DECLARE_CRYPTO_WAIT(wait);
3482         struct crypto_aead *tfm;
3483         unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
3484
3485         rc = smb2_get_enc_key(server, tr_hdr->SessionId, enc, key);
3486         if (rc) {
3487                 cifs_dbg(VFS, "%s: Could not get %scryption key\n", __func__,
3488                          enc ? "en" : "de");
3489                 return 0;
3490         }
3491
3492         rc = smb3_crypto_aead_allocate(server);
3493         if (rc) {
3494                 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
3495                 return rc;
3496         }
3497
3498         tfm = enc ? server->secmech.ccmaesencrypt :
3499                                                 server->secmech.ccmaesdecrypt;
3500         rc = crypto_aead_setkey(tfm, key, SMB3_SIGN_KEY_SIZE);
3501         if (rc) {
3502                 cifs_dbg(VFS, "%s: Failed to set aead key %d\n", __func__, rc);
3503                 return rc;
3504         }
3505
3506         rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
3507         if (rc) {
3508                 cifs_dbg(VFS, "%s: Failed to set authsize %d\n", __func__, rc);
3509                 return rc;
3510         }
3511
3512         req = aead_request_alloc(tfm, GFP_KERNEL);
3513         if (!req) {
3514                 cifs_dbg(VFS, "%s: Failed to alloc aead request\n", __func__);
3515                 return -ENOMEM;
3516         }
3517
3518         if (!enc) {
3519                 memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
3520                 crypt_len += SMB2_SIGNATURE_SIZE;
3521         }
3522
3523         sg = init_sg(num_rqst, rqst, sign);
3524         if (!sg) {
3525                 cifs_dbg(VFS, "%s: Failed to init sg\n", __func__);
3526                 rc = -ENOMEM;
3527                 goto free_req;
3528         }
3529
3530         iv_len = crypto_aead_ivsize(tfm);
3531         iv = kzalloc(iv_len, GFP_KERNEL);
3532         if (!iv) {
3533                 cifs_dbg(VFS, "%s: Failed to alloc iv\n", __func__);
3534                 rc = -ENOMEM;
3535                 goto free_sg;
3536         }
3537         iv[0] = 3;
3538         memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
3539
3540         aead_request_set_crypt(req, sg, sg, crypt_len, iv);
3541         aead_request_set_ad(req, assoc_data_len);
3542
3543         aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
3544                                   crypto_req_done, &wait);
3545
3546         rc = crypto_wait_req(enc ? crypto_aead_encrypt(req)
3547                                 : crypto_aead_decrypt(req), &wait);
3548
3549         if (!rc && enc)
3550                 memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
3551
3552         kfree(iv);
3553 free_sg:
3554         kfree(sg);
3555 free_req:
3556         kfree(req);
3557         return rc;
3558 }
3559
3560 void
3561 smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst)
3562 {
3563         int i, j;
3564
3565         for (i = 0; i < num_rqst; i++) {
3566                 if (rqst[i].rq_pages) {
3567                         for (j = rqst[i].rq_npages - 1; j >= 0; j--)
3568                                 put_page(rqst[i].rq_pages[j]);
3569                         kfree(rqst[i].rq_pages);
3570                 }
3571         }
3572 }
3573
3574 /*
3575  * This function will initialize new_rq and encrypt the content.
3576  * The first entry, new_rq[0], only contains a single iov which contains
3577  * a smb2_transform_hdr and is pre-allocated by the caller.
3578  * This function then populates new_rq[1+] with the content from olq_rq[0+].
3579  *
3580  * The end result is an array of smb_rqst structures where the first structure
3581  * only contains a single iov for the transform header which we then can pass
3582  * to crypt_message().
3583  *
3584  * new_rq[0].rq_iov[0] :  smb2_transform_hdr pre-allocated by the caller
3585  * new_rq[1+].rq_iov[*] == old_rq[0+].rq_iov[*] : SMB2/3 requests
3586  */
3587 static int
3588 smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
3589                        struct smb_rqst *new_rq, struct smb_rqst *old_rq)
3590 {
3591         struct page **pages;
3592         struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
3593         unsigned int npages;
3594         unsigned int orig_len = 0;
3595         int i, j;
3596         int rc = -ENOMEM;
3597
3598         for (i = 1; i < num_rqst; i++) {
3599                 npages = old_rq[i - 1].rq_npages;
3600                 pages = kmalloc_array(npages, sizeof(struct page *),
3601                                       GFP_KERNEL);
3602                 if (!pages)
3603                         goto err_free;
3604
3605                 new_rq[i].rq_pages = pages;
3606                 new_rq[i].rq_npages = npages;
3607                 new_rq[i].rq_offset = old_rq[i - 1].rq_offset;
3608                 new_rq[i].rq_pagesz = old_rq[i - 1].rq_pagesz;
3609                 new_rq[i].rq_tailsz = old_rq[i - 1].rq_tailsz;
3610                 new_rq[i].rq_iov = old_rq[i - 1].rq_iov;
3611                 new_rq[i].rq_nvec = old_rq[i - 1].rq_nvec;
3612
3613                 orig_len += smb_rqst_len(server, &old_rq[i - 1]);
3614
3615                 for (j = 0; j < npages; j++) {
3616                         pages[j] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
3617                         if (!pages[j])
3618                                 goto err_free;
3619                 }
3620
3621                 /* copy pages form the old */
3622                 for (j = 0; j < npages; j++) {
3623                         char *dst, *src;
3624                         unsigned int offset, len;
3625
3626                         rqst_page_get_length(&new_rq[i], j, &len, &offset);
3627
3628                         dst = (char *) kmap(new_rq[i].rq_pages[j]) + offset;
3629                         src = (char *) kmap(old_rq[i - 1].rq_pages[j]) + offset;
3630
3631                         memcpy(dst, src, len);
3632                         kunmap(new_rq[i].rq_pages[j]);
3633                         kunmap(old_rq[i - 1].rq_pages[j]);
3634                 }
3635         }
3636
3637         /* fill the 1st iov with a transform header */
3638         fill_transform_hdr(tr_hdr, orig_len, old_rq);
3639
3640         rc = crypt_message(server, num_rqst, new_rq, 1);
3641         cifs_dbg(FYI, "Encrypt message returned %d\n", rc);
3642         if (rc)
3643                 goto err_free;
3644
3645         return rc;
3646
3647 err_free:
3648         smb3_free_compound_rqst(num_rqst - 1, &new_rq[1]);
3649         return rc;
3650 }
3651
3652 static int
3653 smb3_is_transform_hdr(void *buf)
3654 {
3655         struct smb2_transform_hdr *trhdr = buf;
3656
3657         return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
3658 }
3659
3660 static int
3661 decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
3662                  unsigned int buf_data_size, struct page **pages,
3663                  unsigned int npages, unsigned int page_data_size)
3664 {
3665         struct kvec iov[2];
3666         struct smb_rqst rqst = {NULL};
3667         int rc;
3668
3669         iov[0].iov_base = buf;
3670         iov[0].iov_len = sizeof(struct smb2_transform_hdr);
3671         iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
3672         iov[1].iov_len = buf_data_size;
3673
3674         rqst.rq_iov = iov;
3675         rqst.rq_nvec = 2;
3676         rqst.rq_pages = pages;
3677         rqst.rq_npages = npages;
3678         rqst.rq_pagesz = PAGE_SIZE;
3679         rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
3680
3681         rc = crypt_message(server, 1, &rqst, 0);
3682         cifs_dbg(FYI, "Decrypt message returned %d\n", rc);
3683
3684         if (rc)
3685                 return rc;
3686
3687         memmove(buf, iov[1].iov_base, buf_data_size);
3688
3689         server->total_read = buf_data_size + page_data_size;
3690
3691         return rc;
3692 }
3693
3694 static int
3695 read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
3696                      unsigned int npages, unsigned int len)
3697 {
3698         int i;
3699         int length;
3700
3701         for (i = 0; i < npages; i++) {
3702                 struct page *page = pages[i];
3703                 size_t n;
3704
3705                 n = len;
3706                 if (len >= PAGE_SIZE) {
3707                         /* enough data to fill the page */
3708                         n = PAGE_SIZE;
3709                         len -= n;
3710                 } else {
3711                         zero_user(page, len, PAGE_SIZE - len);
3712                         len = 0;
3713                 }
3714                 length = cifs_read_page_from_socket(server, page, 0, n);
3715                 if (length < 0)
3716                         return length;
3717                 server->total_read += length;
3718         }
3719
3720         return 0;
3721 }
3722
3723 static int
3724 init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
3725                unsigned int cur_off, struct bio_vec **page_vec)
3726 {
3727         struct bio_vec *bvec;
3728         int i;
3729
3730         bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
3731         if (!bvec)
3732                 return -ENOMEM;
3733
3734         for (i = 0; i < npages; i++) {
3735                 bvec[i].bv_page = pages[i];
3736                 bvec[i].bv_offset = (i == 0) ? cur_off : 0;
3737                 bvec[i].bv_len = min_t(unsigned int, PAGE_SIZE, data_size);
3738                 data_size -= bvec[i].bv_len;
3739         }
3740
3741         if (data_size != 0) {
3742                 cifs_dbg(VFS, "%s: something went wrong\n", __func__);
3743                 kfree(bvec);
3744                 return -EIO;
3745         }
3746
3747         *page_vec = bvec;
3748         return 0;
3749 }
3750
3751 static int
3752 handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
3753                  char *buf, unsigned int buf_len, struct page **pages,
3754                  unsigned int npages, unsigned int page_data_size)
3755 {
3756         unsigned int data_offset;
3757         unsigned int data_len;
3758         unsigned int cur_off;
3759         unsigned int cur_page_idx;
3760         unsigned int pad_len;
3761         struct cifs_readdata *rdata = mid->callback_data;
3762         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
3763         struct bio_vec *bvec = NULL;
3764         struct iov_iter iter;
3765         struct kvec iov;
3766         int length;
3767         bool use_rdma_mr = false;
3768
3769         if (shdr->Command != SMB2_READ) {
3770                 cifs_dbg(VFS, "only big read responses are supported\n");
3771                 return -ENOTSUPP;
3772         }
3773
3774         if (server->ops->is_session_expired &&
3775             server->ops->is_session_expired(buf)) {
3776                 cifs_reconnect(server);
3777                 wake_up(&server->response_q);
3778                 return -1;
3779         }
3780
3781         if (server->ops->is_status_pending &&
3782                         server->ops->is_status_pending(buf, server))
3783                 return -1;
3784
3785         /* set up first two iov to get credits */
3786         rdata->iov[0].iov_base = buf;
3787         rdata->iov[0].iov_len = 0;
3788         rdata->iov[1].iov_base = buf;
3789         rdata->iov[1].iov_len =
3790                 min_t(unsigned int, buf_len, server->vals->read_rsp_size);
3791         cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
3792                  rdata->iov[0].iov_base, rdata->iov[0].iov_len);
3793         cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
3794                  rdata->iov[1].iov_base, rdata->iov[1].iov_len);
3795
3796         rdata->result = server->ops->map_error(buf, true);
3797         if (rdata->result != 0) {
3798                 cifs_dbg(FYI, "%s: server returned error %d\n",
3799                          __func__, rdata->result);
3800                 /* normal error on read response */
3801                 dequeue_mid(mid, false);
3802                 return 0;
3803         }
3804
3805         data_offset = server->ops->read_data_offset(buf);
3806 #ifdef CONFIG_CIFS_SMB_DIRECT
3807         use_rdma_mr = rdata->mr;
3808 #endif
3809         data_len = server->ops->read_data_length(buf, use_rdma_mr);
3810
3811         if (data_offset < server->vals->read_rsp_size) {
3812                 /*
3813                  * win2k8 sometimes sends an offset of 0 when the read
3814                  * is beyond the EOF. Treat it as if the data starts just after
3815                  * the header.
3816                  */
3817                 cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
3818                          __func__, data_offset);
3819                 data_offset = server->vals->read_rsp_size;
3820         } else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
3821                 /* data_offset is beyond the end of smallbuf */
3822                 cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
3823                          __func__, data_offset);
3824                 rdata->result = -EIO;
3825                 dequeue_mid(mid, rdata->result);
3826                 return 0;
3827         }
3828
3829         pad_len = data_offset - server->vals->read_rsp_size;
3830
3831         if (buf_len <= data_offset) {
3832                 /* read response payload is in pages */
3833                 cur_page_idx = pad_len / PAGE_SIZE;
3834                 cur_off = pad_len % PAGE_SIZE;
3835
3836                 if (cur_page_idx != 0) {
3837                         /* data offset is beyond the 1st page of response */
3838                         cifs_dbg(FYI, "%s: data offset (%u) beyond 1st page of response\n",
3839                                  __func__, data_offset);
3840                         rdata->result = -EIO;
3841                         dequeue_mid(mid, rdata->result);
3842                         return 0;
3843                 }
3844
3845                 if (data_len > page_data_size - pad_len) {
3846                         /* data_len is corrupt -- discard frame */
3847                         rdata->result = -EIO;
3848                         dequeue_mid(mid, rdata->result);
3849                         return 0;
3850                 }
3851
3852                 rdata->result = init_read_bvec(pages, npages, page_data_size,
3853                                                cur_off, &bvec);
3854                 if (rdata->result != 0) {
3855                         dequeue_mid(mid, rdata->result);
3856                         return 0;
3857                 }
3858
3859                 iov_iter_bvec(&iter, WRITE, bvec, npages, data_len);
3860         } else if (buf_len >= data_offset + data_len) {
3861                 /* read response payload is in buf */
3862                 WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
3863                 iov.iov_base = buf + data_offset;
3864                 iov.iov_len = data_len;
3865                 iov_iter_kvec(&iter, WRITE, &iov, 1, data_len);
3866         } else {
3867                 /* read response payload cannot be in both buf and pages */
3868                 WARN_ONCE(1, "buf can not contain only a part of read data");
3869                 rdata->result = -EIO;
3870                 dequeue_mid(mid, rdata->result);
3871                 return 0;
3872         }
3873
3874         length = rdata->copy_into_pages(server, rdata, &iter);
3875
3876         kfree(bvec);
3877
3878         if (length < 0)
3879                 return length;
3880
3881         dequeue_mid(mid, false);
3882         return length;
3883 }
3884
3885 static int
3886 receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid)
3887 {
3888         char *buf = server->smallbuf;
3889         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
3890         unsigned int npages;
3891         struct page **pages;
3892         unsigned int len;
3893         unsigned int buflen = server->pdu_size;
3894         int rc;
3895         int i = 0;
3896
3897         len = min_t(unsigned int, buflen, server->vals->read_rsp_size +
3898                 sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
3899
3900         rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
3901         if (rc < 0)
3902                 return rc;
3903         server->total_read += rc;
3904
3905         len = le32_to_cpu(tr_hdr->OriginalMessageSize) -
3906                 server->vals->read_rsp_size;
3907         npages = DIV_ROUND_UP(len, PAGE_SIZE);
3908
3909         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
3910         if (!pages) {
3911                 rc = -ENOMEM;
3912                 goto discard_data;
3913         }
3914
3915         for (; i < npages; i++) {
3916                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
3917                 if (!pages[i]) {
3918                         rc = -ENOMEM;
3919                         goto discard_data;
3920                 }
3921         }
3922
3923         /* read read data into pages */
3924         rc = read_data_into_pages(server, pages, npages, len);
3925         if (rc)
3926                 goto free_pages;
3927
3928         rc = cifs_discard_remaining_data(server);
3929         if (rc)
3930                 goto free_pages;
3931
3932         rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size,
3933                               pages, npages, len);
3934         if (rc)
3935                 goto free_pages;
3936
3937         *mid = smb2_find_mid(server, buf);
3938         if (*mid == NULL)
3939                 cifs_dbg(FYI, "mid not found\n");
3940         else {
3941                 cifs_dbg(FYI, "mid found\n");
3942                 (*mid)->decrypted = true;
3943                 rc = handle_read_data(server, *mid, buf,
3944                                       server->vals->read_rsp_size,
3945                                       pages, npages, len);
3946         }
3947
3948 free_pages:
3949         for (i = i - 1; i >= 0; i--)
3950                 put_page(pages[i]);
3951         kfree(pages);
3952         return rc;
3953 discard_data:
3954         cifs_discard_remaining_data(server);
3955         goto free_pages;
3956 }
3957
3958 static int
3959 receive_encrypted_standard(struct TCP_Server_Info *server,
3960                            struct mid_q_entry **mids, char **bufs,
3961                            int *num_mids)
3962 {
3963         int ret, length;
3964         char *buf = server->smallbuf;
3965         char *tmpbuf;
3966         struct smb2_sync_hdr *shdr;
3967         unsigned int pdu_length = server->pdu_size;
3968         unsigned int buf_size;
3969         struct mid_q_entry *mid_entry;
3970         int next_is_large;
3971         char *next_buffer = NULL;
3972
3973         *num_mids = 0;
3974
3975         /* switch to large buffer if too big for a small one */
3976         if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE) {
3977                 server->large_buf = true;
3978                 memcpy(server->bigbuf, buf, server->total_read);
3979                 buf = server->bigbuf;
3980         }
3981
3982         /* now read the rest */
3983         length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
3984                                 pdu_length - HEADER_SIZE(server) + 1);
3985         if (length < 0)
3986                 return length;
3987         server->total_read += length;
3988
3989         buf_size = pdu_length - sizeof(struct smb2_transform_hdr);
3990         length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0);
3991         if (length)
3992                 return length;
3993
3994         next_is_large = server->large_buf;
3995  one_more:
3996         shdr = (struct smb2_sync_hdr *)buf;
3997         if (shdr->NextCommand) {
3998                 if (next_is_large) {
3999                         tmpbuf = server->bigbuf;
4000                         next_buffer = (char *)cifs_buf_get();
4001                 } else {
4002                         tmpbuf = server->smallbuf;
4003                         next_buffer = (char *)cifs_small_buf_get();
4004                 }
4005                 memcpy(next_buffer,
4006                        tmpbuf + le32_to_cpu(shdr->NextCommand),
4007                        pdu_length - le32_to_cpu(shdr->NextCommand));
4008         }
4009
4010         mid_entry = smb2_find_mid(server, buf);
4011         if (mid_entry == NULL)
4012                 cifs_dbg(FYI, "mid not found\n");
4013         else {
4014                 cifs_dbg(FYI, "mid found\n");
4015                 mid_entry->decrypted = true;
4016                 mid_entry->resp_buf_size = server->pdu_size;
4017         }
4018
4019         if (*num_mids >= MAX_COMPOUND) {
4020                 cifs_dbg(VFS, "too many PDUs in compound\n");
4021                 return -1;
4022         }
4023         bufs[*num_mids] = buf;
4024         mids[(*num_mids)++] = mid_entry;
4025
4026         if (mid_entry && mid_entry->handle)
4027                 ret = mid_entry->handle(server, mid_entry);
4028         else
4029                 ret = cifs_handle_standard(server, mid_entry);
4030
4031         if (ret == 0 && shdr->NextCommand) {
4032                 pdu_length -= le32_to_cpu(shdr->NextCommand);
4033                 server->large_buf = next_is_large;
4034                 if (next_is_large)
4035                         server->bigbuf = next_buffer;
4036                 else
4037                         server->smallbuf = next_buffer;
4038
4039                 buf += le32_to_cpu(shdr->NextCommand);
4040                 goto one_more;
4041         }
4042
4043         return ret;
4044 }
4045
4046 static int
4047 smb3_receive_transform(struct TCP_Server_Info *server,
4048                        struct mid_q_entry **mids, char **bufs, int *num_mids)
4049 {
4050         char *buf = server->smallbuf;
4051         unsigned int pdu_length = server->pdu_size;
4052         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
4053         unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
4054
4055         if (pdu_length < sizeof(struct smb2_transform_hdr) +
4056                                                 sizeof(struct smb2_sync_hdr)) {
4057                 cifs_dbg(VFS, "Transform message is too small (%u)\n",
4058                          pdu_length);
4059                 cifs_reconnect(server);
4060                 wake_up(&server->response_q);
4061                 return -ECONNABORTED;
4062         }
4063
4064         if (pdu_length < orig_len + sizeof(struct smb2_transform_hdr)) {
4065                 cifs_dbg(VFS, "Transform message is broken\n");
4066                 cifs_reconnect(server);
4067                 wake_up(&server->response_q);
4068                 return -ECONNABORTED;
4069         }
4070
4071         /* TODO: add support for compounds containing READ. */
4072         if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server)) {
4073                 *num_mids = 1;
4074                 return receive_encrypted_read(server, &mids[0]);
4075         }
4076
4077         return receive_encrypted_standard(server, mids, bufs, num_mids);
4078 }
4079
4080 int
4081 smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
4082 {
4083         char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
4084
4085         return handle_read_data(server, mid, buf, server->pdu_size,
4086                                 NULL, 0, 0);
4087 }
4088
4089 static int
4090 smb2_next_header(char *buf)
4091 {
4092         struct smb2_sync_hdr *hdr = (struct smb2_sync_hdr *)buf;
4093         struct smb2_transform_hdr *t_hdr = (struct smb2_transform_hdr *)buf;
4094
4095         if (hdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM)
4096                 return sizeof(struct smb2_transform_hdr) +
4097                   le32_to_cpu(t_hdr->OriginalMessageSize);
4098
4099         return le32_to_cpu(hdr->NextCommand);
4100 }
4101
4102 static int
4103 smb2_make_node(unsigned int xid, struct inode *inode,
4104                struct dentry *dentry, struct cifs_tcon *tcon,
4105                char *full_path, umode_t mode, dev_t dev)
4106 {
4107         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
4108         int rc = -EPERM;
4109         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
4110         FILE_ALL_INFO *buf = NULL;
4111         struct cifs_io_parms io_parms;
4112         __u32 oplock = 0;
4113         struct cifs_fid fid;
4114         struct cifs_open_parms oparms;
4115         unsigned int bytes_written;
4116         struct win_dev *pdev;
4117         struct kvec iov[2];
4118
4119         /*
4120          * Check if mounted with mount parm 'sfu' mount parm.
4121          * SFU emulation should work with all servers, but only
4122          * supports block and char device (no socket & fifo),
4123          * and was used by default in earlier versions of Windows
4124          */
4125         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
4126                 goto out;
4127
4128         /*
4129          * TODO: Add ability to create instead via reparse point. Windows (e.g.
4130          * their current NFS server) uses this approach to expose special files
4131          * over SMB2/SMB3 and Samba will do this with SMB3.1.1 POSIX Extensions
4132          */
4133
4134         if (!S_ISCHR(mode) && !S_ISBLK(mode))
4135                 goto out;
4136
4137         cifs_dbg(FYI, "sfu compat create special file\n");
4138
4139         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
4140         if (buf == NULL) {
4141                 rc = -ENOMEM;
4142                 goto out;
4143         }
4144
4145         if (backup_cred(cifs_sb))
4146                 create_options |= CREATE_OPEN_BACKUP_INTENT;
4147
4148         oparms.tcon = tcon;
4149         oparms.cifs_sb = cifs_sb;
4150         oparms.desired_access = GENERIC_WRITE;
4151         oparms.create_options = create_options;
4152         oparms.disposition = FILE_CREATE;
4153         oparms.path = full_path;
4154         oparms.fid = &fid;
4155         oparms.reconnect = false;
4156
4157         if (tcon->ses->server->oplocks)
4158                 oplock = REQ_OPLOCK;
4159         else
4160                 oplock = 0;
4161         rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
4162         if (rc)
4163                 goto out;
4164
4165         /*
4166          * BB Do not bother to decode buf since no local inode yet to put
4167          * timestamps in, but we can reuse it safely.
4168          */
4169
4170         pdev = (struct win_dev *)buf;
4171         io_parms.pid = current->tgid;
4172         io_parms.tcon = tcon;
4173         io_parms.offset = 0;
4174         io_parms.length = sizeof(struct win_dev);
4175         iov[1].iov_base = buf;
4176         iov[1].iov_len = sizeof(struct win_dev);
4177         if (S_ISCHR(mode)) {
4178                 memcpy(pdev->type, "IntxCHR", 8);
4179                 pdev->major = cpu_to_le64(MAJOR(dev));
4180                 pdev->minor = cpu_to_le64(MINOR(dev));
4181                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
4182                                                         &bytes_written, iov, 1);
4183         } else if (S_ISBLK(mode)) {
4184                 memcpy(pdev->type, "IntxBLK", 8);
4185                 pdev->major = cpu_to_le64(MAJOR(dev));
4186                 pdev->minor = cpu_to_le64(MINOR(dev));
4187                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
4188                                                         &bytes_written, iov, 1);
4189         }
4190         tcon->ses->server->ops->close(xid, tcon, &fid);
4191         d_drop(dentry);
4192
4193         /* FIXME: add code here to set EAs */
4194 out:
4195         kfree(buf);
4196         return rc;
4197 }
4198
4199
4200 struct smb_version_operations smb20_operations = {
4201         .compare_fids = smb2_compare_fids,
4202         .setup_request = smb2_setup_request,
4203         .setup_async_request = smb2_setup_async_request,
4204         .check_receive = smb2_check_receive,
4205         .add_credits = smb2_add_credits,
4206         .set_credits = smb2_set_credits,
4207         .get_credits_field = smb2_get_credits_field,
4208         .get_credits = smb2_get_credits,
4209         .wait_mtu_credits = cifs_wait_mtu_credits,
4210         .get_next_mid = smb2_get_next_mid,
4211         .revert_current_mid = smb2_revert_current_mid,
4212         .read_data_offset = smb2_read_data_offset,
4213         .read_data_length = smb2_read_data_length,
4214         .map_error = map_smb2_to_linux_error,
4215         .find_mid = smb2_find_mid,
4216         .check_message = smb2_check_message,
4217         .dump_detail = smb2_dump_detail,
4218         .clear_stats = smb2_clear_stats,
4219         .print_stats = smb2_print_stats,
4220         .is_oplock_break = smb2_is_valid_oplock_break,
4221         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4222         .downgrade_oplock = smb2_downgrade_oplock,
4223         .need_neg = smb2_need_neg,
4224         .negotiate = smb2_negotiate,
4225         .negotiate_wsize = smb2_negotiate_wsize,
4226         .negotiate_rsize = smb2_negotiate_rsize,
4227         .sess_setup = SMB2_sess_setup,
4228         .logoff = SMB2_logoff,
4229         .tree_connect = SMB2_tcon,
4230         .tree_disconnect = SMB2_tdis,
4231         .qfs_tcon = smb2_qfs_tcon,
4232         .is_path_accessible = smb2_is_path_accessible,
4233         .can_echo = smb2_can_echo,
4234         .echo = SMB2_echo,
4235         .query_path_info = smb2_query_path_info,
4236         .get_srv_inum = smb2_get_srv_inum,
4237         .query_file_info = smb2_query_file_info,
4238         .set_path_size = smb2_set_path_size,
4239         .set_file_size = smb2_set_file_size,
4240         .set_file_info = smb2_set_file_info,
4241         .set_compression = smb2_set_compression,
4242         .mkdir = smb2_mkdir,
4243         .mkdir_setinfo = smb2_mkdir_setinfo,
4244         .rmdir = smb2_rmdir,
4245         .unlink = smb2_unlink,
4246         .rename = smb2_rename_path,
4247         .create_hardlink = smb2_create_hardlink,
4248         .query_symlink = smb2_query_symlink,
4249         .query_mf_symlink = smb3_query_mf_symlink,
4250         .create_mf_symlink = smb3_create_mf_symlink,
4251         .open = smb2_open_file,
4252         .set_fid = smb2_set_fid,
4253         .close = smb2_close_file,
4254         .flush = smb2_flush_file,
4255         .async_readv = smb2_async_readv,
4256         .async_writev = smb2_async_writev,
4257         .sync_read = smb2_sync_read,
4258         .sync_write = smb2_sync_write,
4259         .query_dir_first = smb2_query_dir_first,
4260         .query_dir_next = smb2_query_dir_next,
4261         .close_dir = smb2_close_dir,
4262         .calc_smb_size = smb2_calc_size,
4263         .is_status_pending = smb2_is_status_pending,
4264         .is_session_expired = smb2_is_session_expired,
4265         .oplock_response = smb2_oplock_response,
4266         .queryfs = smb2_queryfs,
4267         .mand_lock = smb2_mand_lock,
4268         .mand_unlock_range = smb2_unlock_range,
4269         .push_mand_locks = smb2_push_mandatory_locks,
4270         .get_lease_key = smb2_get_lease_key,
4271         .set_lease_key = smb2_set_lease_key,
4272         .new_lease_key = smb2_new_lease_key,
4273         .calc_signature = smb2_calc_signature,
4274         .is_read_op = smb2_is_read_op,
4275         .set_oplock_level = smb2_set_oplock_level,
4276         .create_lease_buf = smb2_create_lease_buf,
4277         .parse_lease_buf = smb2_parse_lease_buf,
4278         .copychunk_range = smb2_copychunk_range,
4279         .wp_retry_size = smb2_wp_retry_size,
4280         .dir_needs_close = smb2_dir_needs_close,
4281         .get_dfs_refer = smb2_get_dfs_refer,
4282         .select_sectype = smb2_select_sectype,
4283 #ifdef CONFIG_CIFS_XATTR
4284         .query_all_EAs = smb2_query_eas,
4285         .set_EA = smb2_set_ea,
4286 #endif /* CIFS_XATTR */
4287 #ifdef CONFIG_CIFS_ACL
4288         .get_acl = get_smb2_acl,
4289         .get_acl_by_fid = get_smb2_acl_by_fid,
4290         .set_acl = set_smb2_acl,
4291 #endif /* CIFS_ACL */
4292         .next_header = smb2_next_header,
4293         .ioctl_query_info = smb2_ioctl_query_info,
4294         .make_node = smb2_make_node,
4295         .fiemap = smb3_fiemap,
4296         .llseek = smb3_llseek,
4297 };
4298
4299 struct smb_version_operations smb21_operations = {
4300         .compare_fids = smb2_compare_fids,
4301         .setup_request = smb2_setup_request,
4302         .setup_async_request = smb2_setup_async_request,
4303         .check_receive = smb2_check_receive,
4304         .add_credits = smb2_add_credits,
4305         .set_credits = smb2_set_credits,
4306         .get_credits_field = smb2_get_credits_field,
4307         .get_credits = smb2_get_credits,
4308         .wait_mtu_credits = smb2_wait_mtu_credits,
4309         .adjust_credits = smb2_adjust_credits,
4310         .get_next_mid = smb2_get_next_mid,
4311         .revert_current_mid = smb2_revert_current_mid,
4312         .read_data_offset = smb2_read_data_offset,
4313         .read_data_length = smb2_read_data_length,
4314         .map_error = map_smb2_to_linux_error,
4315         .find_mid = smb2_find_mid,
4316         .check_message = smb2_check_message,
4317         .dump_detail = smb2_dump_detail,
4318         .clear_stats = smb2_clear_stats,
4319         .print_stats = smb2_print_stats,
4320         .is_oplock_break = smb2_is_valid_oplock_break,
4321         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4322         .downgrade_oplock = smb21_downgrade_oplock,
4323         .need_neg = smb2_need_neg,
4324         .negotiate = smb2_negotiate,
4325         .negotiate_wsize = smb2_negotiate_wsize,
4326         .negotiate_rsize = smb2_negotiate_rsize,
4327         .sess_setup = SMB2_sess_setup,
4328         .logoff = SMB2_logoff,
4329         .tree_connect = SMB2_tcon,
4330         .tree_disconnect = SMB2_tdis,
4331         .qfs_tcon = smb2_qfs_tcon,
4332         .is_path_accessible = smb2_is_path_accessible,
4333         .can_echo = smb2_can_echo,
4334         .echo = SMB2_echo,
4335         .query_path_info = smb2_query_path_info,
4336         .get_srv_inum = smb2_get_srv_inum,
4337         .query_file_info = smb2_query_file_info,
4338         .set_path_size = smb2_set_path_size,
4339         .set_file_size = smb2_set_file_size,
4340         .set_file_info = smb2_set_file_info,
4341         .set_compression = smb2_set_compression,
4342         .mkdir = smb2_mkdir,
4343         .mkdir_setinfo = smb2_mkdir_setinfo,
4344         .rmdir = smb2_rmdir,
4345         .unlink = smb2_unlink,
4346         .rename = smb2_rename_path,
4347         .create_hardlink = smb2_create_hardlink,
4348         .query_symlink = smb2_query_symlink,
4349         .query_mf_symlink = smb3_query_mf_symlink,
4350         .create_mf_symlink = smb3_create_mf_symlink,
4351         .open = smb2_open_file,
4352         .set_fid = smb2_set_fid,
4353         .close = smb2_close_file,
4354         .flush = smb2_flush_file,
4355         .async_readv = smb2_async_readv,
4356         .async_writev = smb2_async_writev,
4357         .sync_read = smb2_sync_read,
4358         .sync_write = smb2_sync_write,
4359         .query_dir_first = smb2_query_dir_first,
4360         .query_dir_next = smb2_query_dir_next,
4361         .close_dir = smb2_close_dir,
4362         .calc_smb_size = smb2_calc_size,
4363         .is_status_pending = smb2_is_status_pending,
4364         .is_session_expired = smb2_is_session_expired,
4365         .oplock_response = smb2_oplock_response,
4366         .queryfs = smb2_queryfs,
4367         .mand_lock = smb2_mand_lock,
4368         .mand_unlock_range = smb2_unlock_range,
4369         .push_mand_locks = smb2_push_mandatory_locks,
4370         .get_lease_key = smb2_get_lease_key,
4371         .set_lease_key = smb2_set_lease_key,
4372         .new_lease_key = smb2_new_lease_key,
4373         .calc_signature = smb2_calc_signature,
4374         .is_read_op = smb21_is_read_op,
4375         .set_oplock_level = smb21_set_oplock_level,
4376         .create_lease_buf = smb2_create_lease_buf,
4377         .parse_lease_buf = smb2_parse_lease_buf,
4378         .copychunk_range = smb2_copychunk_range,
4379         .wp_retry_size = smb2_wp_retry_size,
4380         .dir_needs_close = smb2_dir_needs_close,
4381         .enum_snapshots = smb3_enum_snapshots,
4382         .get_dfs_refer = smb2_get_dfs_refer,
4383         .select_sectype = smb2_select_sectype,
4384 #ifdef CONFIG_CIFS_XATTR
4385         .query_all_EAs = smb2_query_eas,
4386         .set_EA = smb2_set_ea,
4387 #endif /* CIFS_XATTR */
4388 #ifdef CONFIG_CIFS_ACL
4389         .get_acl = get_smb2_acl,
4390         .get_acl_by_fid = get_smb2_acl_by_fid,
4391         .set_acl = set_smb2_acl,
4392 #endif /* CIFS_ACL */
4393         .next_header = smb2_next_header,
4394         .ioctl_query_info = smb2_ioctl_query_info,
4395         .make_node = smb2_make_node,
4396         .fiemap = smb3_fiemap,
4397         .llseek = smb3_llseek,
4398 };
4399
4400 struct smb_version_operations smb30_operations = {
4401         .compare_fids = smb2_compare_fids,
4402         .setup_request = smb2_setup_request,
4403         .setup_async_request = smb2_setup_async_request,
4404         .check_receive = smb2_check_receive,
4405         .add_credits = smb2_add_credits,
4406         .set_credits = smb2_set_credits,
4407         .get_credits_field = smb2_get_credits_field,
4408         .get_credits = smb2_get_credits,
4409         .wait_mtu_credits = smb2_wait_mtu_credits,
4410         .adjust_credits = smb2_adjust_credits,
4411         .get_next_mid = smb2_get_next_mid,
4412         .revert_current_mid = smb2_revert_current_mid,
4413         .read_data_offset = smb2_read_data_offset,
4414         .read_data_length = smb2_read_data_length,
4415         .map_error = map_smb2_to_linux_error,
4416         .find_mid = smb2_find_mid,
4417         .check_message = smb2_check_message,
4418         .dump_detail = smb2_dump_detail,
4419         .clear_stats = smb2_clear_stats,
4420         .print_stats = smb2_print_stats,
4421         .dump_share_caps = smb2_dump_share_caps,
4422         .is_oplock_break = smb2_is_valid_oplock_break,
4423         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4424         .downgrade_oplock = smb21_downgrade_oplock,
4425         .need_neg = smb2_need_neg,
4426         .negotiate = smb2_negotiate,
4427         .negotiate_wsize = smb3_negotiate_wsize,
4428         .negotiate_rsize = smb3_negotiate_rsize,
4429         .sess_setup = SMB2_sess_setup,
4430         .logoff = SMB2_logoff,
4431         .tree_connect = SMB2_tcon,
4432         .tree_disconnect = SMB2_tdis,
4433         .qfs_tcon = smb3_qfs_tcon,
4434         .is_path_accessible = smb2_is_path_accessible,
4435         .can_echo = smb2_can_echo,
4436         .echo = SMB2_echo,
4437         .query_path_info = smb2_query_path_info,
4438         .get_srv_inum = smb2_get_srv_inum,
4439         .query_file_info = smb2_query_file_info,
4440         .set_path_size = smb2_set_path_size,
4441         .set_file_size = smb2_set_file_size,
4442         .set_file_info = smb2_set_file_info,
4443         .set_compression = smb2_set_compression,
4444         .mkdir = smb2_mkdir,
4445         .mkdir_setinfo = smb2_mkdir_setinfo,
4446         .rmdir = smb2_rmdir,
4447         .unlink = smb2_unlink,
4448         .rename = smb2_rename_path,
4449         .create_hardlink = smb2_create_hardlink,
4450         .query_symlink = smb2_query_symlink,
4451         .query_mf_symlink = smb3_query_mf_symlink,
4452         .create_mf_symlink = smb3_create_mf_symlink,
4453         .open = smb2_open_file,
4454         .set_fid = smb2_set_fid,
4455         .close = smb2_close_file,
4456         .flush = smb2_flush_file,
4457         .async_readv = smb2_async_readv,
4458         .async_writev = smb2_async_writev,
4459         .sync_read = smb2_sync_read,
4460         .sync_write = smb2_sync_write,
4461         .query_dir_first = smb2_query_dir_first,
4462         .query_dir_next = smb2_query_dir_next,
4463         .close_dir = smb2_close_dir,
4464         .calc_smb_size = smb2_calc_size,
4465         .is_status_pending = smb2_is_status_pending,
4466         .is_session_expired = smb2_is_session_expired,
4467         .oplock_response = smb2_oplock_response,
4468         .queryfs = smb2_queryfs,
4469         .mand_lock = smb2_mand_lock,
4470         .mand_unlock_range = smb2_unlock_range,
4471         .push_mand_locks = smb2_push_mandatory_locks,
4472         .get_lease_key = smb2_get_lease_key,
4473         .set_lease_key = smb2_set_lease_key,
4474         .new_lease_key = smb2_new_lease_key,
4475         .generate_signingkey = generate_smb30signingkey,
4476         .calc_signature = smb3_calc_signature,
4477         .set_integrity  = smb3_set_integrity,
4478         .is_read_op = smb21_is_read_op,
4479         .set_oplock_level = smb3_set_oplock_level,
4480         .create_lease_buf = smb3_create_lease_buf,
4481         .parse_lease_buf = smb3_parse_lease_buf,
4482         .copychunk_range = smb2_copychunk_range,
4483         .duplicate_extents = smb2_duplicate_extents,
4484         .validate_negotiate = smb3_validate_negotiate,
4485         .wp_retry_size = smb2_wp_retry_size,
4486         .dir_needs_close = smb2_dir_needs_close,
4487         .fallocate = smb3_fallocate,
4488         .enum_snapshots = smb3_enum_snapshots,
4489         .init_transform_rq = smb3_init_transform_rq,
4490         .is_transform_hdr = smb3_is_transform_hdr,
4491         .receive_transform = smb3_receive_transform,
4492         .get_dfs_refer = smb2_get_dfs_refer,
4493         .select_sectype = smb2_select_sectype,
4494 #ifdef CONFIG_CIFS_XATTR
4495         .query_all_EAs = smb2_query_eas,
4496         .set_EA = smb2_set_ea,
4497 #endif /* CIFS_XATTR */
4498 #ifdef CONFIG_CIFS_ACL
4499         .get_acl = get_smb2_acl,
4500         .get_acl_by_fid = get_smb2_acl_by_fid,
4501         .set_acl = set_smb2_acl,
4502 #endif /* CIFS_ACL */
4503         .next_header = smb2_next_header,
4504         .ioctl_query_info = smb2_ioctl_query_info,
4505         .make_node = smb2_make_node,
4506         .fiemap = smb3_fiemap,
4507         .llseek = smb3_llseek,
4508 };
4509
4510 struct smb_version_operations smb311_operations = {
4511         .compare_fids = smb2_compare_fids,
4512         .setup_request = smb2_setup_request,
4513         .setup_async_request = smb2_setup_async_request,
4514         .check_receive = smb2_check_receive,
4515         .add_credits = smb2_add_credits,
4516         .set_credits = smb2_set_credits,
4517         .get_credits_field = smb2_get_credits_field,
4518         .get_credits = smb2_get_credits,
4519         .wait_mtu_credits = smb2_wait_mtu_credits,
4520         .adjust_credits = smb2_adjust_credits,
4521         .get_next_mid = smb2_get_next_mid,
4522         .revert_current_mid = smb2_revert_current_mid,
4523         .read_data_offset = smb2_read_data_offset,
4524         .read_data_length = smb2_read_data_length,
4525         .map_error = map_smb2_to_linux_error,
4526         .find_mid = smb2_find_mid,
4527         .check_message = smb2_check_message,
4528         .dump_detail = smb2_dump_detail,
4529         .clear_stats = smb2_clear_stats,
4530         .print_stats = smb2_print_stats,
4531         .dump_share_caps = smb2_dump_share_caps,
4532         .is_oplock_break = smb2_is_valid_oplock_break,
4533         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4534         .downgrade_oplock = smb21_downgrade_oplock,
4535         .need_neg = smb2_need_neg,
4536         .negotiate = smb2_negotiate,
4537         .negotiate_wsize = smb3_negotiate_wsize,
4538         .negotiate_rsize = smb3_negotiate_rsize,
4539         .sess_setup = SMB2_sess_setup,
4540         .logoff = SMB2_logoff,
4541         .tree_connect = SMB2_tcon,
4542         .tree_disconnect = SMB2_tdis,
4543         .qfs_tcon = smb3_qfs_tcon,
4544         .is_path_accessible = smb2_is_path_accessible,
4545         .can_echo = smb2_can_echo,
4546         .echo = SMB2_echo,
4547         .query_path_info = smb2_query_path_info,
4548         .get_srv_inum = smb2_get_srv_inum,
4549         .query_file_info = smb2_query_file_info,
4550         .set_path_size = smb2_set_path_size,
4551         .set_file_size = smb2_set_file_size,
4552         .set_file_info = smb2_set_file_info,
4553         .set_compression = smb2_set_compression,
4554         .mkdir = smb2_mkdir,
4555         .mkdir_setinfo = smb2_mkdir_setinfo,
4556         .posix_mkdir = smb311_posix_mkdir,
4557         .rmdir = smb2_rmdir,
4558         .unlink = smb2_unlink,
4559         .rename = smb2_rename_path,
4560         .create_hardlink = smb2_create_hardlink,
4561         .query_symlink = smb2_query_symlink,
4562         .query_mf_symlink = smb3_query_mf_symlink,
4563         .create_mf_symlink = smb3_create_mf_symlink,
4564         .open = smb2_open_file,
4565         .set_fid = smb2_set_fid,
4566         .close = smb2_close_file,
4567         .flush = smb2_flush_file,
4568         .async_readv = smb2_async_readv,
4569         .async_writev = smb2_async_writev,
4570         .sync_read = smb2_sync_read,
4571         .sync_write = smb2_sync_write,
4572         .query_dir_first = smb2_query_dir_first,
4573         .query_dir_next = smb2_query_dir_next,
4574         .close_dir = smb2_close_dir,
4575         .calc_smb_size = smb2_calc_size,
4576         .is_status_pending = smb2_is_status_pending,
4577         .is_session_expired = smb2_is_session_expired,
4578         .oplock_response = smb2_oplock_response,
4579         .queryfs = smb311_queryfs,
4580         .mand_lock = smb2_mand_lock,
4581         .mand_unlock_range = smb2_unlock_range,
4582         .push_mand_locks = smb2_push_mandatory_locks,
4583         .get_lease_key = smb2_get_lease_key,
4584         .set_lease_key = smb2_set_lease_key,
4585         .new_lease_key = smb2_new_lease_key,
4586         .generate_signingkey = generate_smb311signingkey,
4587         .calc_signature = smb3_calc_signature,
4588         .set_integrity  = smb3_set_integrity,
4589         .is_read_op = smb21_is_read_op,
4590         .set_oplock_level = smb3_set_oplock_level,
4591         .create_lease_buf = smb3_create_lease_buf,
4592         .parse_lease_buf = smb3_parse_lease_buf,
4593         .copychunk_range = smb2_copychunk_range,
4594         .duplicate_extents = smb2_duplicate_extents,
4595 /*      .validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
4596         .wp_retry_size = smb2_wp_retry_size,
4597         .dir_needs_close = smb2_dir_needs_close,
4598         .fallocate = smb3_fallocate,
4599         .enum_snapshots = smb3_enum_snapshots,
4600         .init_transform_rq = smb3_init_transform_rq,
4601         .is_transform_hdr = smb3_is_transform_hdr,
4602         .receive_transform = smb3_receive_transform,
4603         .get_dfs_refer = smb2_get_dfs_refer,
4604         .select_sectype = smb2_select_sectype,
4605 #ifdef CONFIG_CIFS_XATTR
4606         .query_all_EAs = smb2_query_eas,
4607         .set_EA = smb2_set_ea,
4608 #endif /* CIFS_XATTR */
4609 #ifdef CONFIG_CIFS_ACL
4610         .get_acl = get_smb2_acl,
4611         .get_acl_by_fid = get_smb2_acl_by_fid,
4612         .set_acl = set_smb2_acl,
4613 #endif /* CIFS_ACL */
4614         .next_header = smb2_next_header,
4615         .ioctl_query_info = smb2_ioctl_query_info,
4616         .make_node = smb2_make_node,
4617         .fiemap = smb3_fiemap,
4618         .llseek = smb3_llseek,
4619 };
4620
4621 struct smb_version_values smb20_values = {
4622         .version_string = SMB20_VERSION_STRING,
4623         .protocol_id = SMB20_PROT_ID,
4624         .req_capabilities = 0, /* MBZ */
4625         .large_lock_type = 0,
4626         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4627         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4628         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4629         .header_size = sizeof(struct smb2_sync_hdr),
4630         .header_preamble_size = 0,
4631         .max_header_size = MAX_SMB2_HDR_SIZE,
4632         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4633         .lock_cmd = SMB2_LOCK,
4634         .cap_unix = 0,
4635         .cap_nt_find = SMB2_NT_FIND,
4636         .cap_large_files = SMB2_LARGE_FILES,
4637         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4638         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4639         .create_lease_size = sizeof(struct create_lease),
4640 };
4641
4642 struct smb_version_values smb21_values = {
4643         .version_string = SMB21_VERSION_STRING,
4644         .protocol_id = SMB21_PROT_ID,
4645         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
4646         .large_lock_type = 0,
4647         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4648         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4649         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4650         .header_size = sizeof(struct smb2_sync_hdr),
4651         .header_preamble_size = 0,
4652         .max_header_size = MAX_SMB2_HDR_SIZE,
4653         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4654         .lock_cmd = SMB2_LOCK,
4655         .cap_unix = 0,
4656         .cap_nt_find = SMB2_NT_FIND,
4657         .cap_large_files = SMB2_LARGE_FILES,
4658         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4659         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4660         .create_lease_size = sizeof(struct create_lease),
4661 };
4662
4663 struct smb_version_values smb3any_values = {
4664         .version_string = SMB3ANY_VERSION_STRING,
4665         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
4666         .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,
4667         .large_lock_type = 0,
4668         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4669         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4670         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4671         .header_size = sizeof(struct smb2_sync_hdr),
4672         .header_preamble_size = 0,
4673         .max_header_size = MAX_SMB2_HDR_SIZE,
4674         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4675         .lock_cmd = SMB2_LOCK,
4676         .cap_unix = 0,
4677         .cap_nt_find = SMB2_NT_FIND,
4678         .cap_large_files = SMB2_LARGE_FILES,
4679         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4680         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4681         .create_lease_size = sizeof(struct create_lease_v2),
4682 };
4683
4684 struct smb_version_values smbdefault_values = {
4685         .version_string = SMBDEFAULT_VERSION_STRING,
4686         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
4687         .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,
4688         .large_lock_type = 0,
4689         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4690         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4691         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4692         .header_size = sizeof(struct smb2_sync_hdr),
4693         .header_preamble_size = 0,
4694         .max_header_size = MAX_SMB2_HDR_SIZE,
4695         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4696         .lock_cmd = SMB2_LOCK,
4697         .cap_unix = 0,
4698         .cap_nt_find = SMB2_NT_FIND,
4699         .cap_large_files = SMB2_LARGE_FILES,
4700         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4701         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4702         .create_lease_size = sizeof(struct create_lease_v2),
4703 };
4704
4705 struct smb_version_values smb30_values = {
4706         .version_string = SMB30_VERSION_STRING,
4707         .protocol_id = SMB30_PROT_ID,
4708         .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,
4709         .large_lock_type = 0,
4710         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4711         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4712         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4713         .header_size = sizeof(struct smb2_sync_hdr),
4714         .header_preamble_size = 0,
4715         .max_header_size = MAX_SMB2_HDR_SIZE,
4716         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4717         .lock_cmd = SMB2_LOCK,
4718         .cap_unix = 0,
4719         .cap_nt_find = SMB2_NT_FIND,
4720         .cap_large_files = SMB2_LARGE_FILES,
4721         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4722         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4723         .create_lease_size = sizeof(struct create_lease_v2),
4724 };
4725
4726 struct smb_version_values smb302_values = {
4727         .version_string = SMB302_VERSION_STRING,
4728         .protocol_id = SMB302_PROT_ID,
4729         .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,
4730         .large_lock_type = 0,
4731         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4732         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4733         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4734         .header_size = sizeof(struct smb2_sync_hdr),
4735         .header_preamble_size = 0,
4736         .max_header_size = MAX_SMB2_HDR_SIZE,
4737         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4738         .lock_cmd = SMB2_LOCK,
4739         .cap_unix = 0,
4740         .cap_nt_find = SMB2_NT_FIND,
4741         .cap_large_files = SMB2_LARGE_FILES,
4742         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4743         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4744         .create_lease_size = sizeof(struct create_lease_v2),
4745 };
4746
4747 struct smb_version_values smb311_values = {
4748         .version_string = SMB311_VERSION_STRING,
4749         .protocol_id = SMB311_PROT_ID,
4750         .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,
4751         .large_lock_type = 0,
4752         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4753         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4754         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4755         .header_size = sizeof(struct smb2_sync_hdr),
4756         .header_preamble_size = 0,
4757         .max_header_size = MAX_SMB2_HDR_SIZE,
4758         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4759         .lock_cmd = SMB2_LOCK,
4760         .cap_unix = 0,
4761         .cap_nt_find = SMB2_NT_FIND,
4762         .cap_large_files = SMB2_LARGE_FILES,
4763         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4764         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4765         .create_lease_size = sizeof(struct create_lease_v2),
4766 };