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 <linux/sort.h>
  14 #include <crypto/aead.h>
  15 #include <linux/fiemap.h>
  16 #include <uapi/linux/magic.h>
  17 #include "cifsfs.h"
  18 #include "cifsglob.h"
  19 #include "smb2pdu.h"
  20 #include "smb2proto.h"
  21 #include "cifsproto.h"
  22 #include "cifs_debug.h"
  23 #include "cifs_unicode.h"
  24 #include "smb2status.h"
  25 #include "smb2glob.h"
  26 #include "cifs_ioctl.h"
  27 #include "smbdirect.h"
  28 #include "fscache.h"
  29 #include "fs_context.h"
  30
  31 /* Change credits for different ops and return the total number of credits */
  32 static int
  33 change_conf(struct TCP_Server_Info *server)
  34 {
  35         server->credits += server->echo_credits + server->oplock_credits;
  36         server->oplock_credits = server->echo_credits = 0;
  37         switch (server->credits) {
  38         case 0:
  39                 return 0;
  40         case 1:
  41                 server->echoes = false;
  42                 server->oplocks = false;
  43                 break;
  44         case 2:
  45                 server->echoes = true;
  46                 server->oplocks = false;
  47                 server->echo_credits = 1;
  48                 break;
  49         default:
  50                 server->echoes = true;
  51                 if (enable_oplocks) {
  52                         server->oplocks = true;
  53                         server->oplock_credits = 1;
  54                 } else
  55                         server->oplocks = false;
  56
  57                 server->echo_credits = 1;
  58         }
  59         server->credits -= server->echo_credits + server->oplock_credits;
  60         return server->credits + server->echo_credits + server->oplock_credits;
  61 }
  62
  63 static void
  64 smb2_add_credits(struct TCP_Server_Info *server,
  65                  const struct cifs_credits *credits, const int optype)
  66 {
  67         int *val, rc = -1;
  68         int scredits, in_flight;
  69         unsigned int add = credits->value;
  70         unsigned int instance = credits->instance;
  71         bool reconnect_detected = false;
  72         bool reconnect_with_invalid_credits = false;
  73
  74         spin_lock(&server->req_lock);
  75         val = server->ops->get_credits_field(server, optype);
  76
  77         /* eg found case where write overlapping reconnect messed up credits */
  78         if (((optype & CIFS_OP_MASK) == CIFS_NEG_OP) && (*val != 0))
  79                 reconnect_with_invalid_credits = true;
  80
  81         if ((instance == 0) || (instance == server->reconnect_instance))
  82                 *val += add;
  83         else
  84                 reconnect_detected = true;
  85
  86         if (*val > 65000) {
  87                 *val = 65000; /* Don't get near 64K credits, avoid srv bugs */
  88                 pr_warn_once("server overflowed SMB3 credits\n");
  89         }
  90         server->in_flight--;
  91         if (server->in_flight == 0 &&
  92            ((optype & CIFS_OP_MASK) != CIFS_NEG_OP) &&
  93            ((optype & CIFS_OP_MASK) != CIFS_SESS_OP))
  94                 rc = change_conf(server);
  95         /*
  96          * Sometimes server returns 0 credits on oplock break ack - we need to
  97          * rebalance credits in this case.
  98          */
  99         else if (server->in_flight > 0 && server->oplock_credits == 0 &&
 100                  server->oplocks) {
 101                 if (server->credits > 1) {
 102                         server->credits--;
 103                         server->oplock_credits++;
 104                 }
 105         }
 106         scredits = *val;
 107         in_flight = server->in_flight;
 108         spin_unlock(&server->req_lock);
 109         wake_up(&server->request_q);
 110
 111         if (reconnect_detected) {
 112                 trace_smb3_reconnect_detected(server->CurrentMid,
 113                         server->conn_id, server->hostname, scredits, add, in_flight);
 114
 115                 cifs_dbg(FYI, "trying to put %d credits from the old server instance %d\n",
 116                          add, instance);
 117         }
 118
 119         if (reconnect_with_invalid_credits) {
 120                 trace_smb3_reconnect_with_invalid_credits(server->CurrentMid,
 121                         server->conn_id, server->hostname, scredits, add, in_flight);
 122                 cifs_dbg(FYI, "Negotiate operation when server credits is non-zero. Optype: %d, server credits: %d, credits added: %d\n",
 123                          optype, scredits, add);
 124         }
 125
 126         spin_lock(&cifs_tcp_ses_lock);
 127         if (server->tcpStatus == CifsNeedReconnect
 128             || server->tcpStatus == CifsExiting) {
 129                 spin_unlock(&cifs_tcp_ses_lock);
 130                 return;
 131         }
 132         spin_unlock(&cifs_tcp_ses_lock);
 133
 134         switch (rc) {
 135         case -1:
 136                 /* change_conf hasn't been executed */
 137                 break;
 138         case 0:
 139                 cifs_server_dbg(VFS, "Possible client or server bug - zero credits\n");
 140                 break;
 141         case 1:
 142                 cifs_server_dbg(VFS, "disabling echoes and oplocks\n");
 143                 break;
 144         case 2:
 145                 cifs_dbg(FYI, "disabling oplocks\n");
 146                 break;
 147         default:
 148                 /* change_conf rebalanced credits for different types */
 149                 break;
 150         }
 151
 152         trace_smb3_add_credits(server->CurrentMid,
 153                         server->conn_id, server->hostname, scredits, add, in_flight);
 154         cifs_dbg(FYI, "%s: added %u credits total=%d\n", __func__, add, scredits);
 155 }
 156
 157 static void
 158 smb2_set_credits(struct TCP_Server_Info *server, const int val)
 159 {
 160         int scredits, in_flight;
 161
 162         spin_lock(&server->req_lock);
 163         server->credits = val;
 164         if (val == 1)
 165                 server->reconnect_instance++;
 166         scredits = server->credits;
 167         in_flight = server->in_flight;
 168         spin_unlock(&server->req_lock);
 169
 170         trace_smb3_set_credits(server->CurrentMid,
 171                         server->conn_id, server->hostname, scredits, val, in_flight);
 172         cifs_dbg(FYI, "%s: set %u credits\n", __func__, val);
 173
 174         /* don't log while holding the lock */
 175         if (val == 1)
 176                 cifs_dbg(FYI, "set credits to 1 due to smb2 reconnect\n");
 177 }
 178
 179 static int *
 180 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
 181 {
 182         switch (optype) {
 183         case CIFS_ECHO_OP:
 184                 return &server->echo_credits;
 185         case CIFS_OBREAK_OP:
 186                 return &server->oplock_credits;
 187         default:
 188                 return &server->credits;
 189         }
 190 }
 191
 192 static unsigned int
 193 smb2_get_credits(struct mid_q_entry *mid)
 194 {
 195         return mid->credits_received;
 196 }
 197
 198 static int
 199 smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
 200                       unsigned int *num, struct cifs_credits *credits)
 201 {
 202         int rc = 0;
 203         unsigned int scredits, in_flight;
 204
 205         spin_lock(&server->req_lock);
 206         while (1) {
 207                 if (server->credits <= 0) {
 208                         spin_unlock(&server->req_lock);
 209                         cifs_num_waiters_inc(server);
 210                         rc = wait_event_killable(server->request_q,
 211                                 has_credits(server, &server->credits, 1));
 212                         cifs_num_waiters_dec(server);
 213                         if (rc)
 214                                 return rc;
 215                         spin_lock(&server->req_lock);
 216                 } else {
 217                         spin_unlock(&server->req_lock);
 218                         spin_lock(&cifs_tcp_ses_lock);
 219                         if (server->tcpStatus == CifsExiting) {
 220                                 spin_unlock(&cifs_tcp_ses_lock);
 221                                 return -ENOENT;
 222                         }
 223                         spin_unlock(&cifs_tcp_ses_lock);
 224
 225                         spin_lock(&server->req_lock);
 226                         scredits = server->credits;
 227                         /* can deadlock with reopen */
 228                         if (scredits <= 8) {
 229                                 *num = SMB2_MAX_BUFFER_SIZE;
 230                                 credits->value = 0;
 231                                 credits->instance = 0;
 232                                 break;
 233                         }
 234
 235                         /* leave some credits for reopen and other ops */
 236                         scredits -= 8;
 237                         *num = min_t(unsigned int, size,
 238                                      scredits * SMB2_MAX_BUFFER_SIZE);
 239
 240                         credits->value =
 241                                 DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
 242                         credits->instance = server->reconnect_instance;
 243                         server->credits -= credits->value;
 244                         server->in_flight++;
 245                         if (server->in_flight > server->max_in_flight)
 246                                 server->max_in_flight = server->in_flight;
 247                         break;
 248                 }
 249         }
 250         scredits = server->credits;
 251         in_flight = server->in_flight;
 252         spin_unlock(&server->req_lock);
 253
 254         trace_smb3_add_credits(server->CurrentMid,
 255                         server->conn_id, server->hostname, scredits, -(credits->value), in_flight);
 256         cifs_dbg(FYI, "%s: removed %u credits total=%d\n",
 257                         __func__, credits->value, scredits);
 258
 259         return rc;
 260 }
 261
 262 static int
 263 smb2_adjust_credits(struct TCP_Server_Info *server,
 264                     struct cifs_credits *credits,
 265                     const unsigned int payload_size)
 266 {
 267         int new_val = DIV_ROUND_UP(payload_size, SMB2_MAX_BUFFER_SIZE);
 268         int scredits, in_flight;
 269
 270         if (!credits->value || credits->value == new_val)
 271                 return 0;
 272
 273         if (credits->value < new_val) {
 274                 trace_smb3_too_many_credits(server->CurrentMid,
 275                                 server->conn_id, server->hostname, 0, credits->value - new_val, 0);
 276                 cifs_server_dbg(VFS, "request has less credits (%d) than required (%d)",
 277                                 credits->value, new_val);
 278
 279                 return -ENOTSUPP;
 280         }
 281
 282         spin_lock(&server->req_lock);
 283
 284         if (server->reconnect_instance != credits->instance) {
 285                 scredits = server->credits;
 286                 in_flight = server->in_flight;
 287                 spin_unlock(&server->req_lock);
 288
 289                 trace_smb3_reconnect_detected(server->CurrentMid,
 290                         server->conn_id, server->hostname, scredits,
 291                         credits->value - new_val, in_flight);
 292                 cifs_server_dbg(VFS, "trying to return %d credits to old session\n",
 293                          credits->value - new_val);
 294                 return -EAGAIN;
 295         }
 296
 297         server->credits += credits->value - new_val;
 298         scredits = server->credits;
 299         in_flight = server->in_flight;
 300         spin_unlock(&server->req_lock);
 301         wake_up(&server->request_q);
 302
 303         trace_smb3_add_credits(server->CurrentMid,
 304                         server->conn_id, server->hostname, scredits,
 305                         credits->value - new_val, in_flight);
 306         cifs_dbg(FYI, "%s: adjust added %u credits total=%d\n",
 307                         __func__, credits->value - new_val, scredits);
 308
 309         credits->value = new_val;
 310
 311         return 0;
 312 }
 313
 314 static __u64
 315 smb2_get_next_mid(struct TCP_Server_Info *server)
 316 {
 317         __u64 mid;
 318         /* for SMB2 we need the current value */
 319         spin_lock(&GlobalMid_Lock);
 320         mid = server->CurrentMid++;
 321         spin_unlock(&GlobalMid_Lock);
 322         return mid;
 323 }
 324
 325 static void
 326 smb2_revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
 327 {
 328         spin_lock(&GlobalMid_Lock);
 329         if (server->CurrentMid >= val)
 330                 server->CurrentMid -= val;
 331         spin_unlock(&GlobalMid_Lock);
 332 }
 333
 334 static struct mid_q_entry *
 335 __smb2_find_mid(struct TCP_Server_Info *server, char *buf, bool dequeue)
 336 {
 337         struct mid_q_entry *mid;
 338         struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
 339         __u64 wire_mid = le64_to_cpu(shdr->MessageId);
 340
 341         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 342                 cifs_server_dbg(VFS, "Encrypted frame parsing not supported yet\n");
 343                 return NULL;
 344         }
 345
 346         spin_lock(&GlobalMid_Lock);
 347         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 348                 if ((mid->mid == wire_mid) &&
 349                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
 350                     (mid->command == shdr->Command)) {
 351                         kref_get(&mid->refcount);
 352                         if (dequeue) {
 353                                 list_del_init(&mid->qhead);
 354                                 mid->mid_flags |= MID_DELETED;
 355                         }
 356                         spin_unlock(&GlobalMid_Lock);
 357                         return mid;
 358                 }
 359         }
 360         spin_unlock(&GlobalMid_Lock);
 361         return NULL;
 362 }
 363
 364 static struct mid_q_entry *
 365 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
 366 {
 367         return __smb2_find_mid(server, buf, false);
 368 }
 369
 370 static struct mid_q_entry *
 371 smb2_find_dequeue_mid(struct TCP_Server_Info *server, char *buf)
 372 {
 373         return __smb2_find_mid(server, buf, true);
 374 }
 375
 376 static void
 377 smb2_dump_detail(void *buf, struct TCP_Server_Info *server)
 378 {
 379 #ifdef CONFIG_CIFS_DEBUG2
 380         struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
 381
 382         cifs_server_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
 383                  shdr->Command, shdr->Status, shdr->Flags, shdr->MessageId,
 384                  shdr->Id.SyncId.ProcessId);
 385         cifs_server_dbg(VFS, "smb buf %p len %u\n", buf,
 386                  server->ops->calc_smb_size(buf, server));
 387 #endif
 388 }
 389
 390 static bool
 391 smb2_need_neg(struct TCP_Server_Info *server)
 392 {
 393         return server->max_read == 0;
 394 }
 395
 396 static int
 397 smb2_negotiate(const unsigned int xid,
 398                struct cifs_ses *ses,
 399                struct TCP_Server_Info *server)
 400 {
 401         int rc;
 402
 403         spin_lock(&GlobalMid_Lock);
 404         server->CurrentMid = 0;
 405         spin_unlock(&GlobalMid_Lock);
 406         rc = SMB2_negotiate(xid, ses, server);
 407         /* BB we probably don't need to retry with modern servers */
 408         if (rc == -EAGAIN)
 409                 rc = -EHOSTDOWN;
 410         return rc;
 411 }
 412
 413 static unsigned int
 414 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
 415 {
 416         struct TCP_Server_Info *server = tcon->ses->server;
 417         unsigned int wsize;
 418
 419         /* start with specified wsize, or default */
 420         wsize = ctx->wsize ? ctx->wsize : CIFS_DEFAULT_IOSIZE;
 421         wsize = min_t(unsigned int, wsize, server->max_write);
 422         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 423                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 424
 425         return wsize;
 426 }
 427
 428 static unsigned int
 429 smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
 430 {
 431         struct TCP_Server_Info *server = tcon->ses->server;
 432         unsigned int wsize;
 433
 434         /* start with specified wsize, or default */
 435         wsize = ctx->wsize ? ctx->wsize : SMB3_DEFAULT_IOSIZE;
 436         wsize = min_t(unsigned int, wsize, server->max_write);
 437 #ifdef CONFIG_CIFS_SMB_DIRECT
 438         if (server->rdma) {
 439                 if (server->sign)
 440                         /*
 441                          * Account for SMB2 data transfer packet header and
 442                          * possible encryption header
 443                          */
 444                         wsize = min_t(unsigned int,
 445                                 wsize,
 446                                 server->smbd_conn->max_fragmented_send_size -
 447                                         SMB2_READWRITE_PDU_HEADER_SIZE -
 448                                         sizeof(struct smb2_transform_hdr));
 449                 else
 450                         wsize = min_t(unsigned int,
 451                                 wsize, server->smbd_conn->max_readwrite_size);
 452         }
 453 #endif
 454         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 455                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 456
 457         return wsize;
 458 }
 459
 460 static unsigned int
 461 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
 462 {
 463         struct TCP_Server_Info *server = tcon->ses->server;
 464         unsigned int rsize;
 465
 466         /* start with specified rsize, or default */
 467         rsize = ctx->rsize ? ctx->rsize : CIFS_DEFAULT_IOSIZE;
 468         rsize = min_t(unsigned int, rsize, server->max_read);
 469
 470         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 471                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 472
 473         return rsize;
 474 }
 475
 476 static unsigned int
 477 smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)
 478 {
 479         struct TCP_Server_Info *server = tcon->ses->server;
 480         unsigned int rsize;
 481
 482         /* start with specified rsize, or default */
 483         rsize = ctx->rsize ? ctx->rsize : SMB3_DEFAULT_IOSIZE;
 484         rsize = min_t(unsigned int, rsize, server->max_read);
 485 #ifdef CONFIG_CIFS_SMB_DIRECT
 486         if (server->rdma) {
 487                 if (server->sign)
 488                         /*
 489                          * Account for SMB2 data transfer packet header and
 490                          * possible encryption header
 491                          */
 492                         rsize = min_t(unsigned int,
 493                                 rsize,
 494                                 server->smbd_conn->max_fragmented_recv_size -
 495                                         SMB2_READWRITE_PDU_HEADER_SIZE -
 496                                         sizeof(struct smb2_transform_hdr));
 497                 else
 498                         rsize = min_t(unsigned int,
 499                                 rsize, server->smbd_conn->max_readwrite_size);
 500         }
 501 #endif
 502
 503         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 504                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 505
 506         return rsize;
 507 }
 508
 509 static int
 510 parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
 511                         size_t buf_len,
 512                         struct cifs_server_iface **iface_list,
 513                         size_t *iface_count)
 514 {
 515         struct network_interface_info_ioctl_rsp *p;
 516         struct sockaddr_in *addr4;
 517         struct sockaddr_in6 *addr6;
 518         struct iface_info_ipv4 *p4;
 519         struct iface_info_ipv6 *p6;
 520         struct cifs_server_iface *info;
 521         ssize_t bytes_left;
 522         size_t next = 0;
 523         int nb_iface = 0;
 524         int rc = 0;
 525
 526         *iface_list = NULL;
 527         *iface_count = 0;
 528
 529         /*
 530          * Fist pass: count and sanity check
 531          */
 532
 533         bytes_left = buf_len;
 534         p = buf;
 535         while (bytes_left >= sizeof(*p)) {
 536                 nb_iface++;
 537                 next = le32_to_cpu(p->Next);
 538                 if (!next) {
 539                         bytes_left -= sizeof(*p);
 540                         break;
 541                 }
 542                 p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
 543                 bytes_left -= next;
 544         }
 545
 546         if (!nb_iface) {
 547                 cifs_dbg(VFS, "%s: malformed interface info\n", __func__);
 548                 rc = -EINVAL;
 549                 goto out;
 550         }
 551
 552         /* Azure rounds the buffer size up 8, to a 16 byte boundary */
 553         if ((bytes_left > 8) || p->Next)
 554                 cifs_dbg(VFS, "%s: incomplete interface info\n", __func__);
 555
 556
 557         /*
 558          * Second pass: extract info to internal structure
 559          */
 560
 561         *iface_list = kcalloc(nb_iface, sizeof(**iface_list), GFP_KERNEL);
 562         if (!*iface_list) {
 563                 rc = -ENOMEM;
 564                 goto out;
 565         }
 566
 567         info = *iface_list;
 568         bytes_left = buf_len;
 569         p = buf;
 570         while (bytes_left >= sizeof(*p)) {
 571                 info->speed = le64_to_cpu(p->LinkSpeed);
 572                 info->rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE) ? 1 : 0;
 573                 info->rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE) ? 1 : 0;
 574
 575                 cifs_dbg(FYI, "%s: adding iface %zu\n", __func__, *iface_count);
 576                 cifs_dbg(FYI, "%s: speed %zu bps\n", __func__, info->speed);
 577                 cifs_dbg(FYI, "%s: capabilities 0x%08x\n", __func__,
 578                          le32_to_cpu(p->Capability));
 579
 580                 switch (p->Family) {
 581                 /*
 582                  * The kernel and wire socket structures have the same
 583                  * layout and use network byte order but make the
 584                  * conversion explicit in case either one changes.
 585                  */
 586                 case INTERNETWORK:
 587                         addr4 = (struct sockaddr_in *)&info->sockaddr;
 588                         p4 = (struct iface_info_ipv4 *)p->Buffer;
 589                         addr4->sin_family = AF_INET;
 590                         memcpy(&addr4->sin_addr, &p4->IPv4Address, 4);
 591
 592                         /* [MS-SMB2] 2.2.32.5.1.1 Clients MUST ignore these */
 593                         addr4->sin_port = cpu_to_be16(CIFS_PORT);
 594
 595                         cifs_dbg(FYI, "%s: ipv4 %pI4\n", __func__,
 596                                  &addr4->sin_addr);
 597                         break;
 598                 case INTERNETWORKV6:
 599                         addr6 = (struct sockaddr_in6 *)&info->sockaddr;
 600                         p6 = (struct iface_info_ipv6 *)p->Buffer;
 601                         addr6->sin6_family = AF_INET6;
 602                         memcpy(&addr6->sin6_addr, &p6->IPv6Address, 16);
 603
 604                         /* [MS-SMB2] 2.2.32.5.1.2 Clients MUST ignore these */
 605                         addr6->sin6_flowinfo = 0;
 606                         addr6->sin6_scope_id = 0;
 607                         addr6->sin6_port = cpu_to_be16(CIFS_PORT);
 608
 609                         cifs_dbg(FYI, "%s: ipv6 %pI6\n", __func__,
 610                                  &addr6->sin6_addr);
 611                         break;
 612                 default:
 613                         cifs_dbg(VFS,
 614                                  "%s: skipping unsupported socket family\n",
 615                                  __func__);
 616                         goto next_iface;
 617                 }
 618
 619                 (*iface_count)++;
 620                 info++;
 621 next_iface:
 622                 next = le32_to_cpu(p->Next);
 623                 if (!next)
 624                         break;
 625                 p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
 626                 bytes_left -= next;
 627         }
 628
 629         if (!*iface_count) {
 630                 rc = -EINVAL;
 631                 goto out;
 632         }
 633
 634 out:
 635         if (rc) {
 636                 kfree(*iface_list);
 637                 *iface_count = 0;
 638                 *iface_list = NULL;
 639         }
 640         return rc;
 641 }
 642
 643 static int compare_iface(const void *ia, const void *ib)
 644 {
 645         const struct cifs_server_iface *a = (struct cifs_server_iface *)ia;
 646         const struct cifs_server_iface *b = (struct cifs_server_iface *)ib;
 647
 648         return a->speed == b->speed ? 0 : (a->speed > b->speed ? -1 : 1);
 649 }
 650
 651 static int
 652 SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
 653 {
 654         int rc;
 655         unsigned int ret_data_len = 0;
 656         struct network_interface_info_ioctl_rsp *out_buf = NULL;
 657         struct cifs_server_iface *iface_list;
 658         size_t iface_count;
 659         struct cifs_ses *ses = tcon->ses;
 660
 661         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 662                         FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
 663                         NULL /* no data input */, 0 /* no data input */,
 664                         CIFSMaxBufSize, (char **)&out_buf, &ret_data_len);
 665         if (rc == -EOPNOTSUPP) {
 666                 cifs_dbg(FYI,
 667                          "server does not support query network interfaces\n");
 668                 goto out;
 669         } else if (rc != 0) {
 670                 cifs_tcon_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
 671                 goto out;
 672         }
 673
 674         rc = parse_server_interfaces(out_buf, ret_data_len,
 675                                      &iface_list, &iface_count);
 676         if (rc)
 677                 goto out;
 678
 679         /* sort interfaces from fastest to slowest */
 680         sort(iface_list, iface_count, sizeof(*iface_list), compare_iface, NULL);
 681
 682         spin_lock(&ses->iface_lock);
 683         kfree(ses->iface_list);
 684         ses->iface_list = iface_list;
 685         ses->iface_count = iface_count;
 686         ses->iface_last_update = jiffies;
 687         spin_unlock(&ses->iface_lock);
 688
 689 out:
 690         kfree(out_buf);
 691         return rc;
 692 }
 693
 694 static void
 695 smb2_close_cached_fid(struct kref *ref)
 696 {
 697         struct cached_fid *cfid = container_of(ref, struct cached_fid,
 698                                                refcount);
 699
 700         if (cfid->is_valid) {
 701                 cifs_dbg(FYI, "clear cached root file handle\n");
 702                 SMB2_close(0, cfid->tcon, cfid->fid->persistent_fid,
 703                            cfid->fid->volatile_fid);
 704         }
 705
 706         /*
 707          * We only check validity above to send SMB2_close,
 708          * but we still need to invalidate these entries
 709          * when this function is called
 710          */
 711         cfid->is_valid = false;
 712         cfid->file_all_info_is_valid = false;
 713         cfid->has_lease = false;
 714         if (cfid->dentry) {
 715                 dput(cfid->dentry);
 716                 cfid->dentry = NULL;
 717         }
 718 }
 719
 720 void close_cached_dir(struct cached_fid *cfid)
 721 {
 722         mutex_lock(&cfid->fid_mutex);
 723         kref_put(&cfid->refcount, smb2_close_cached_fid);
 724         mutex_unlock(&cfid->fid_mutex);
 725 }
 726
 727 void close_cached_dir_lease_locked(struct cached_fid *cfid)
 728 {
 729         if (cfid->has_lease) {
 730                 cfid->has_lease = false;
 731                 kref_put(&cfid->refcount, smb2_close_cached_fid);
 732         }
 733 }
 734
 735 void close_cached_dir_lease(struct cached_fid *cfid)
 736 {
 737         mutex_lock(&cfid->fid_mutex);
 738         close_cached_dir_lease_locked(cfid);
 739         mutex_unlock(&cfid->fid_mutex);
 740 }
 741
 742 void
 743 smb2_cached_lease_break(struct work_struct *work)
 744 {
 745         struct cached_fid *cfid = container_of(work,
 746                                 struct cached_fid, lease_break);
 747
 748         close_cached_dir_lease(cfid);
 749 }
 750
 751 /*
 752  * Open the and cache a directory handle.
 753  * Only supported for the root handle.
 754  */
 755 int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
 756                 const char *path,
 757                 struct cifs_sb_info *cifs_sb,
 758                 struct cached_fid **cfid)
 759 {
 760         struct cifs_ses *ses = tcon->ses;
 761         struct TCP_Server_Info *server = ses->server;
 762         struct cifs_open_parms oparms;
 763         struct smb2_create_rsp *o_rsp = NULL;
 764         struct smb2_query_info_rsp *qi_rsp = NULL;
 765         int resp_buftype[2];
 766         struct smb_rqst rqst[2];
 767         struct kvec rsp_iov[2];
 768         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
 769         struct kvec qi_iov[1];
 770         int rc, flags = 0;
 771         __le16 utf16_path = 0; /* Null - since an open of top of share */
 772         u8 oplock = SMB2_OPLOCK_LEVEL_II;
 773         struct cifs_fid *pfid;
 774         struct dentry *dentry;
 775
 776         if (tcon->nohandlecache)
 777                 return -ENOTSUPP;
 778
 779         if (cifs_sb->root == NULL)
 780                 return -ENOENT;
 781
 782         if (strlen(path))
 783                 return -ENOENT;
 784
 785         dentry = cifs_sb->root;
 786
 787         mutex_lock(&tcon->crfid.fid_mutex);
 788         if (tcon->crfid.is_valid) {
 789                 cifs_dbg(FYI, "found a cached root file handle\n");
 790                 *cfid = &tcon->crfid;
 791                 kref_get(&tcon->crfid.refcount);
 792                 mutex_unlock(&tcon->crfid.fid_mutex);
 793                 return 0;
 794         }
 795
 796         /*
 797          * We do not hold the lock for the open because in case
 798          * SMB2_open needs to reconnect, it will end up calling
 799          * cifs_mark_open_files_invalid() which takes the lock again
 800          * thus causing a deadlock
 801          */
 802
 803         mutex_unlock(&tcon->crfid.fid_mutex);
 804
 805         if (smb3_encryption_required(tcon))
 806                 flags |= CIFS_TRANSFORM_REQ;
 807
 808         if (!server->ops->new_lease_key)
 809                 return -EIO;
 810
 811         pfid = tcon->crfid.fid;
 812         server->ops->new_lease_key(pfid);
 813
 814         memset(rqst, 0, sizeof(rqst));
 815         resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
 816         memset(rsp_iov, 0, sizeof(rsp_iov));
 817
 818         /* Open */
 819         memset(&open_iov, 0, sizeof(open_iov));
 820         rqst[0].rq_iov = open_iov;
 821         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
 822
 823         oparms.tcon = tcon;
 824         oparms.create_options = cifs_create_options(cifs_sb, 0);
 825         oparms.desired_access = FILE_READ_ATTRIBUTES;
 826         oparms.disposition = FILE_OPEN;
 827         oparms.fid = pfid;
 828         oparms.reconnect = false;
 829
 830         rc = SMB2_open_init(tcon, server,
 831                             &rqst[0], &oplock, &oparms, &utf16_path);
 832         if (rc)
 833                 goto oshr_free;
 834         smb2_set_next_command(tcon, &rqst[0]);
 835
 836         memset(&qi_iov, 0, sizeof(qi_iov));
 837         rqst[1].rq_iov = qi_iov;
 838         rqst[1].rq_nvec = 1;
 839
 840         rc = SMB2_query_info_init(tcon, server,
 841                                   &rqst[1], COMPOUND_FID,
 842                                   COMPOUND_FID, FILE_ALL_INFORMATION,
 843                                   SMB2_O_INFO_FILE, 0,
 844                                   sizeof(struct smb2_file_all_info) +
 845                                   PATH_MAX * 2, 0, NULL);
 846         if (rc)
 847                 goto oshr_free;
 848
 849         smb2_set_related(&rqst[1]);
 850
 851         rc = compound_send_recv(xid, ses, server,
 852                                 flags, 2, rqst,
 853                                 resp_buftype, rsp_iov);
 854         mutex_lock(&tcon->crfid.fid_mutex);
 855
 856         /*
 857          * Now we need to check again as the cached root might have
 858          * been successfully re-opened from a concurrent process
 859          */
 860
 861         if (tcon->crfid.is_valid) {
 862                 /* work was already done */
 863
 864                 /* stash fids for close() later */
 865                 struct cifs_fid fid = {
 866                         .persistent_fid = pfid->persistent_fid,
 867                         .volatile_fid = pfid->volatile_fid,
 868                 };
 869
 870                 /*
 871                  * caller expects this func to set the fid in crfid to valid
 872                  * cached root, so increment the refcount.
 873                  */
 874                 kref_get(&tcon->crfid.refcount);
 875
 876                 mutex_unlock(&tcon->crfid.fid_mutex);
 877
 878                 if (rc == 0) {
 879                         /* close extra handle outside of crit sec */
 880                         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 881                 }
 882                 rc = 0;
 883                 goto oshr_free;
 884         }
 885
 886         /* Cached root is still invalid, continue normaly */
 887
 888         if (rc) {
 889                 if (rc == -EREMCHG) {
 890                         tcon->need_reconnect = true;
 891                         pr_warn_once("server share %s deleted\n",
 892                                      tcon->treeName);
 893                 }
 894                 goto oshr_exit;
 895         }
 896
 897         atomic_inc(&tcon->num_remote_opens);
 898
 899         o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
 900         oparms.fid->persistent_fid = o_rsp->PersistentFileId;
 901         oparms.fid->volatile_fid = o_rsp->VolatileFileId;
 902 #ifdef CONFIG_CIFS_DEBUG2
 903         oparms.fid->mid = le64_to_cpu(o_rsp->hdr.MessageId);
 904 #endif /* CIFS_DEBUG2 */
 905
 906         tcon->crfid.tcon = tcon;
 907         tcon->crfid.is_valid = true;
 908         tcon->crfid.dentry = dentry;
 909         dget(dentry);
 910         kref_init(&tcon->crfid.refcount);
 911
 912         /* BB TBD check to see if oplock level check can be removed below */
 913         if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) {
 914                 /*
 915                  * See commit 2f94a3125b87. Increment the refcount when we
 916                  * get a lease for root, release it if lease break occurs
 917                  */
 918                 kref_get(&tcon->crfid.refcount);
 919                 tcon->crfid.has_lease = true;
 920                 smb2_parse_contexts(server, o_rsp,
 921                                 &oparms.fid->epoch,
 922                                     oparms.fid->lease_key, &oplock,
 923                                     NULL, NULL);
 924         } else
 925                 goto oshr_exit;
 926
 927         qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
 928         if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info))
 929                 goto oshr_exit;
 930         if (!smb2_validate_and_copy_iov(
 931                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 932                                 sizeof(struct smb2_file_all_info),
 933                                 &rsp_iov[1], sizeof(struct smb2_file_all_info),
 934                                 (char *)&tcon->crfid.file_all_info))
 935                 tcon->crfid.file_all_info_is_valid = true;
 936         tcon->crfid.time = jiffies;
 937
 938
 939 oshr_exit:
 940         mutex_unlock(&tcon->crfid.fid_mutex);
 941 oshr_free:
 942         SMB2_open_free(&rqst[0]);
 943         SMB2_query_info_free(&rqst[1]);
 944         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 945         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 946         if (rc == 0)
 947                 *cfid = &tcon->crfid;
 948         return rc;
 949 }
 950
 951 int open_cached_dir_by_dentry(struct cifs_tcon *tcon,
 952                               struct dentry *dentry,
 953                               struct cached_fid **cfid)
 954 {
 955         mutex_lock(&tcon->crfid.fid_mutex);
 956         if (tcon->crfid.dentry == dentry) {
 957                 cifs_dbg(FYI, "found a cached root file handle by dentry\n");
 958                 *cfid = &tcon->crfid;
 959                 kref_get(&tcon->crfid.refcount);
 960                 mutex_unlock(&tcon->crfid.fid_mutex);
 961                 return 0;
 962         }
 963         mutex_unlock(&tcon->crfid.fid_mutex);
 964         return -ENOENT;
 965 }
 966
 967 static void
 968 smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
 969               struct cifs_sb_info *cifs_sb)
 970 {
 971         int rc;
 972         __le16 srch_path = 0; /* Null - open root of share */
 973         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 974         struct cifs_open_parms oparms;
 975         struct cifs_fid fid;
 976         struct cached_fid *cfid = NULL;
 977
 978         oparms.tcon = tcon;
 979         oparms.desired_access = FILE_READ_ATTRIBUTES;
 980         oparms.disposition = FILE_OPEN;
 981         oparms.create_options = cifs_create_options(cifs_sb, 0);
 982         oparms.fid = &fid;
 983         oparms.reconnect = false;
 984
 985         rc = open_cached_dir(xid, tcon, "", cifs_sb, &cfid);
 986         if (rc == 0)
 987                 memcpy(&fid, cfid->fid, sizeof(struct cifs_fid));
 988         else
 989                 rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
 990                                NULL, NULL);
 991         if (rc)
 992                 return;
 993
 994         SMB3_request_interfaces(xid, tcon);
 995
 996         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 997                         FS_ATTRIBUTE_INFORMATION);
 998         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 999                         FS_DEVICE_INFORMATION);
1000         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
1001                         FS_VOLUME_INFORMATION);
1002         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
1003                         FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
1004         if (cfid == NULL)
1005                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
1006         else
1007                 close_cached_dir(cfid);
1008 }
1009
1010 static void
1011 smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
1012               struct cifs_sb_info *cifs_sb)
1013 {
1014         int rc;
1015         __le16 srch_path = 0; /* Null - open root of share */
1016         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1017         struct cifs_open_parms oparms;
1018         struct cifs_fid fid;
1019
1020         oparms.tcon = tcon;
1021         oparms.desired_access = FILE_READ_ATTRIBUTES;
1022         oparms.disposition = FILE_OPEN;
1023         oparms.create_options = cifs_create_options(cifs_sb, 0);
1024         oparms.fid = &fid;
1025         oparms.reconnect = false;
1026
1027         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
1028                        NULL, NULL);
1029         if (rc)
1030                 return;
1031
1032         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
1033                         FS_ATTRIBUTE_INFORMATION);
1034         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
1035                         FS_DEVICE_INFORMATION);
1036         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
1037 }
1038
1039 static int
1040 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
1041                         struct cifs_sb_info *cifs_sb, const char *full_path)
1042 {
1043         int rc;
1044         __le16 *utf16_path;
1045         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1046         struct cifs_open_parms oparms;
1047         struct cifs_fid fid;
1048
1049         if ((*full_path == 0) && tcon->crfid.is_valid)
1050                 return 0;
1051
1052         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
1053         if (!utf16_path)
1054                 return -ENOMEM;
1055
1056         oparms.tcon = tcon;
1057         oparms.desired_access = FILE_READ_ATTRIBUTES;
1058         oparms.disposition = FILE_OPEN;
1059         oparms.create_options = cifs_create_options(cifs_sb, 0);
1060         oparms.fid = &fid;
1061         oparms.reconnect = false;
1062
1063         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
1064                        NULL);
1065         if (rc) {
1066                 kfree(utf16_path);
1067                 return rc;
1068         }
1069
1070         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
1071         kfree(utf16_path);
1072         return rc;
1073 }
1074
1075 static int
1076 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
1077                   struct cifs_sb_info *cifs_sb, const char *full_path,
1078                   u64 *uniqueid, FILE_ALL_INFO *data)
1079 {
1080         *uniqueid = le64_to_cpu(data->IndexNumber);
1081         return 0;
1082 }
1083
1084 static int
1085 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
1086                      struct cifs_fid *fid, FILE_ALL_INFO *data)
1087 {
1088         int rc;
1089         struct smb2_file_all_info *smb2_data;
1090
1091         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1092                             GFP_KERNEL);
1093         if (smb2_data == NULL)
1094                 return -ENOMEM;
1095
1096         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
1097                              smb2_data);
1098         if (!rc)
1099                 move_smb2_info_to_cifs(data, smb2_data);
1100         kfree(smb2_data);
1101         return rc;
1102 }
1103
1104 #ifdef CONFIG_CIFS_XATTR
1105 static ssize_t
1106 move_smb2_ea_to_cifs(char *dst, size_t dst_size,
1107                      struct smb2_file_full_ea_info *src, size_t src_size,
1108                      const unsigned char *ea_name)
1109 {
1110         int rc = 0;
1111         unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0;
1112         char *name, *value;
1113         size_t buf_size = dst_size;
1114         size_t name_len, value_len, user_name_len;
1115
1116         while (src_size > 0) {
1117                 name = &src->ea_data[0];
1118                 name_len = (size_t)src->ea_name_length;
1119                 value = &src->ea_data[src->ea_name_length + 1];
1120                 value_len = (size_t)le16_to_cpu(src->ea_value_length);
1121
1122                 if (name_len == 0)
1123                         break;
1124
1125                 if (src_size < 8 + name_len + 1 + value_len) {
1126                         cifs_dbg(FYI, "EA entry goes beyond length of list\n");
1127                         rc = -EIO;
1128                         goto out;
1129                 }
1130
1131                 if (ea_name) {
1132                         if (ea_name_len == name_len &&
1133                             memcmp(ea_name, name, name_len) == 0) {
1134                                 rc = value_len;
1135                                 if (dst_size == 0)
1136                                         goto out;
1137                                 if (dst_size < value_len) {
1138                                         rc = -ERANGE;
1139                                         goto out;
1140                                 }
1141                                 memcpy(dst, value, value_len);
1142                                 goto out;
1143                         }
1144                 } else {
1145                         /* 'user.' plus a terminating null */
1146                         user_name_len = 5 + 1 + name_len;
1147
1148                         if (buf_size == 0) {
1149                                 /* skip copy - calc size only */
1150                                 rc += user_name_len;
1151                         } else if (dst_size >= user_name_len) {
1152                                 dst_size -= user_name_len;
1153                                 memcpy(dst, "user.", 5);
1154                                 dst += 5;
1155                                 memcpy(dst, src->ea_data, name_len);
1156                                 dst += name_len;
1157                                 *dst = 0;
1158                                 ++dst;
1159                                 rc += user_name_len;
1160                         } else {
1161                                 /* stop before overrun buffer */
1162                                 rc = -ERANGE;
1163                                 break;
1164                         }
1165                 }
1166
1167                 if (!src->next_entry_offset)
1168                         break;
1169
1170                 if (src_size < le32_to_cpu(src->next_entry_offset)) {
1171                         /* stop before overrun buffer */
1172                         rc = -ERANGE;
1173                         break;
1174                 }
1175                 src_size -= le32_to_cpu(src->next_entry_offset);
1176                 src = (void *)((char *)src +
1177                                le32_to_cpu(src->next_entry_offset));
1178         }
1179
1180         /* didn't find the named attribute */
1181         if (ea_name)
1182                 rc = -ENODATA;
1183
1184 out:
1185         return (ssize_t)rc;
1186 }
1187
1188 static ssize_t
1189 smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
1190                const unsigned char *path, const unsigned char *ea_name,
1191                char *ea_data, size_t buf_size,
1192                struct cifs_sb_info *cifs_sb)
1193 {
1194         int rc;
1195         struct kvec rsp_iov = {NULL, 0};
1196         int buftype = CIFS_NO_BUFFER;
1197         struct smb2_query_info_rsp *rsp;
1198         struct smb2_file_full_ea_info *info = NULL;
1199
1200         rc = smb2_query_info_compound(xid, tcon, path,
1201                                       FILE_READ_EA,
1202                                       FILE_FULL_EA_INFORMATION,
1203                                       SMB2_O_INFO_FILE,
1204                                       CIFSMaxBufSize -
1205                                       MAX_SMB2_CREATE_RESPONSE_SIZE -
1206                                       MAX_SMB2_CLOSE_RESPONSE_SIZE,
1207                                       &rsp_iov, &buftype, cifs_sb);
1208         if (rc) {
1209                 /*
1210                  * If ea_name is NULL (listxattr) and there are no EAs,
1211                  * return 0 as it's not an error. Otherwise, the specified
1212                  * ea_name was not found.
1213                  */
1214                 if (!ea_name && rc == -ENODATA)
1215                         rc = 0;
1216                 goto qeas_exit;
1217         }
1218
1219         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
1220         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
1221                                le32_to_cpu(rsp->OutputBufferLength),
1222                                &rsp_iov,
1223                                sizeof(struct smb2_file_full_ea_info));
1224         if (rc)
1225                 goto qeas_exit;
1226
1227         info = (struct smb2_file_full_ea_info *)(
1228                         le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
1229         rc = move_smb2_ea_to_cifs(ea_data, buf_size, info,
1230                         le32_to_cpu(rsp->OutputBufferLength), ea_name);
1231
1232  qeas_exit:
1233         free_rsp_buf(buftype, rsp_iov.iov_base);
1234         return rc;
1235 }
1236
1237
1238 static int
1239 smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
1240             const char *path, const char *ea_name, const void *ea_value,
1241             const __u16 ea_value_len, const struct nls_table *nls_codepage,
1242             struct cifs_sb_info *cifs_sb)
1243 {
1244         struct cifs_ses *ses = tcon->ses;
1245         struct TCP_Server_Info *server = cifs_pick_channel(ses);
1246         __le16 *utf16_path = NULL;
1247         int ea_name_len = strlen(ea_name);
1248         int flags = CIFS_CP_CREATE_CLOSE_OP;
1249         int len;
1250         struct smb_rqst rqst[3];
1251         int resp_buftype[3];
1252         struct kvec rsp_iov[3];
1253         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1254         struct cifs_open_parms oparms;
1255         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1256         struct cifs_fid fid;
1257         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
1258         unsigned int size[1];
1259         void *data[1];
1260         struct smb2_file_full_ea_info *ea = NULL;
1261         struct kvec close_iov[1];
1262         struct smb2_query_info_rsp *rsp;
1263         int rc, used_len = 0;
1264
1265         if (smb3_encryption_required(tcon))
1266                 flags |= CIFS_TRANSFORM_REQ;
1267
1268         if (ea_name_len > 255)
1269                 return -EINVAL;
1270
1271         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1272         if (!utf16_path)
1273                 return -ENOMEM;
1274
1275         memset(rqst, 0, sizeof(rqst));
1276         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1277         memset(rsp_iov, 0, sizeof(rsp_iov));
1278
1279         if (ses->server->ops->query_all_EAs) {
1280                 if (!ea_value) {
1281                         rc = ses->server->ops->query_all_EAs(xid, tcon, path,
1282                                                              ea_name, NULL, 0,
1283                                                              cifs_sb);
1284                         if (rc == -ENODATA)
1285                                 goto sea_exit;
1286                 } else {
1287                         /* If we are adding a attribute we should first check
1288                          * if there will be enough space available to store
1289                          * the new EA. If not we should not add it since we
1290                          * would not be able to even read the EAs back.
1291                          */
1292                         rc = smb2_query_info_compound(xid, tcon, path,
1293                                       FILE_READ_EA,
1294                                       FILE_FULL_EA_INFORMATION,
1295                                       SMB2_O_INFO_FILE,
1296                                       CIFSMaxBufSize -
1297                                       MAX_SMB2_CREATE_RESPONSE_SIZE -
1298                                       MAX_SMB2_CLOSE_RESPONSE_SIZE,
1299                                       &rsp_iov[1], &resp_buftype[1], cifs_sb);
1300                         if (rc == 0) {
1301                                 rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
1302                                 used_len = le32_to_cpu(rsp->OutputBufferLength);
1303                         }
1304                         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1305                         resp_buftype[1] = CIFS_NO_BUFFER;
1306                         memset(&rsp_iov[1], 0, sizeof(rsp_iov[1]));
1307                         rc = 0;
1308
1309                         /* Use a fudge factor of 256 bytes in case we collide
1310                          * with a different set_EAs command.
1311                          */
1312                         if(CIFSMaxBufSize - MAX_SMB2_CREATE_RESPONSE_SIZE -
1313                            MAX_SMB2_CLOSE_RESPONSE_SIZE - 256 <
1314                            used_len + ea_name_len + ea_value_len + 1) {
1315                                 rc = -ENOSPC;
1316                                 goto sea_exit;
1317                         }
1318                 }
1319         }
1320
1321         /* Open */
1322         memset(&open_iov, 0, sizeof(open_iov));
1323         rqst[0].rq_iov = open_iov;
1324         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1325
1326         memset(&oparms, 0, sizeof(oparms));
1327         oparms.tcon = tcon;
1328         oparms.desired_access = FILE_WRITE_EA;
1329         oparms.disposition = FILE_OPEN;
1330         oparms.create_options = cifs_create_options(cifs_sb, 0);
1331         oparms.fid = &fid;
1332         oparms.reconnect = false;
1333
1334         rc = SMB2_open_init(tcon, server,
1335                             &rqst[0], &oplock, &oparms, utf16_path);
1336         if (rc)
1337                 goto sea_exit;
1338         smb2_set_next_command(tcon, &rqst[0]);
1339
1340
1341         /* Set Info */
1342         memset(&si_iov, 0, sizeof(si_iov));
1343         rqst[1].rq_iov = si_iov;
1344         rqst[1].rq_nvec = 1;
1345
1346         len = sizeof(*ea) + ea_name_len + ea_value_len + 1;
1347         ea = kzalloc(len, GFP_KERNEL);
1348         if (ea == NULL) {
1349                 rc = -ENOMEM;
1350                 goto sea_exit;
1351         }
1352
1353         ea->ea_name_length = ea_name_len;
1354         ea->ea_value_length = cpu_to_le16(ea_value_len);
1355         memcpy(ea->ea_data, ea_name, ea_name_len + 1);
1356         memcpy(ea->ea_data + ea_name_len + 1, ea_value, ea_value_len);
1357
1358         size[0] = len;
1359         data[0] = ea;
1360
1361         rc = SMB2_set_info_init(tcon, server,
1362                                 &rqst[1], COMPOUND_FID,
1363                                 COMPOUND_FID, current->tgid,
1364                                 FILE_FULL_EA_INFORMATION,
1365                                 SMB2_O_INFO_FILE, 0, data, size);
1366         smb2_set_next_command(tcon, &rqst[1]);
1367         smb2_set_related(&rqst[1]);
1368
1369
1370         /* Close */
1371         memset(&close_iov, 0, sizeof(close_iov));
1372         rqst[2].rq_iov = close_iov;
1373         rqst[2].rq_nvec = 1;
1374         rc = SMB2_close_init(tcon, server,
1375                              &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
1376         smb2_set_related(&rqst[2]);
1377
1378         rc = compound_send_recv(xid, ses, server,
1379                                 flags, 3, rqst,
1380                                 resp_buftype, rsp_iov);
1381         /* no need to bump num_remote_opens because handle immediately closed */
1382
1383  sea_exit:
1384         kfree(ea);
1385         kfree(utf16_path);
1386         SMB2_open_free(&rqst[0]);
1387         SMB2_set_info_free(&rqst[1]);
1388         SMB2_close_free(&rqst[2]);
1389         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1390         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1391         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1392         return rc;
1393 }
1394 #endif
1395
1396 static bool
1397 smb2_can_echo(struct TCP_Server_Info *server)
1398 {
1399         return server->echoes;
1400 }
1401
1402 static void
1403 smb2_clear_stats(struct cifs_tcon *tcon)
1404 {
1405         int i;
1406
1407         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
1408                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
1409                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
1410         }
1411 }
1412
1413 static void
1414 smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
1415 {
1416         seq_puts(m, "\n\tShare Capabilities:");
1417         if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
1418                 seq_puts(m, " DFS,");
1419         if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
1420                 seq_puts(m, " CONTINUOUS AVAILABILITY,");
1421         if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
1422                 seq_puts(m, " SCALEOUT,");
1423         if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
1424                 seq_puts(m, " CLUSTER,");
1425         if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
1426                 seq_puts(m, " ASYMMETRIC,");
1427         if (tcon->capabilities == 0)
1428                 seq_puts(m, " None");
1429         if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
1430                 seq_puts(m, " Aligned,");
1431         if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
1432                 seq_puts(m, " Partition Aligned,");
1433         if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
1434                 seq_puts(m, " SSD,");
1435         if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
1436                 seq_puts(m, " TRIM-support,");
1437
1438         seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
1439         seq_printf(m, "\n\ttid: 0x%x", tcon->tid);
1440         if (tcon->perf_sector_size)
1441                 seq_printf(m, "\tOptimal sector size: 0x%x",
1442                            tcon->perf_sector_size);
1443         seq_printf(m, "\tMaximal Access: 0x%x", tcon->maximal_access);
1444 }
1445
1446 static void
1447 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
1448 {
1449         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
1450         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
1451
1452         /*
1453          *  Can't display SMB2_NEGOTIATE, SESSION_SETUP, LOGOFF, CANCEL and ECHO
1454          *  totals (requests sent) since those SMBs are per-session not per tcon
1455          */
1456         seq_printf(m, "\nBytes read: %llu  Bytes written: %llu",
1457                    (long long)(tcon->bytes_read),
1458                    (long long)(tcon->bytes_written));
1459         seq_printf(m, "\nOpen files: %d total (local), %d open on server",
1460                    atomic_read(&tcon->num_local_opens),
1461                    atomic_read(&tcon->num_remote_opens));
1462         seq_printf(m, "\nTreeConnects: %d total %d failed",
1463                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
1464                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
1465         seq_printf(m, "\nTreeDisconnects: %d total %d failed",
1466                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
1467                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
1468         seq_printf(m, "\nCreates: %d total %d failed",
1469                    atomic_read(&sent[SMB2_CREATE_HE]),
1470                    atomic_read(&failed[SMB2_CREATE_HE]));
1471         seq_printf(m, "\nCloses: %d total %d failed",
1472                    atomic_read(&sent[SMB2_CLOSE_HE]),
1473                    atomic_read(&failed[SMB2_CLOSE_HE]));
1474         seq_printf(m, "\nFlushes: %d total %d failed",
1475                    atomic_read(&sent[SMB2_FLUSH_HE]),
1476                    atomic_read(&failed[SMB2_FLUSH_HE]));
1477         seq_printf(m, "\nReads: %d total %d failed",
1478                    atomic_read(&sent[SMB2_READ_HE]),
1479                    atomic_read(&failed[SMB2_READ_HE]));
1480         seq_printf(m, "\nWrites: %d total %d failed",
1481                    atomic_read(&sent[SMB2_WRITE_HE]),
1482                    atomic_read(&failed[SMB2_WRITE_HE]));
1483         seq_printf(m, "\nLocks: %d total %d failed",
1484                    atomic_read(&sent[SMB2_LOCK_HE]),
1485                    atomic_read(&failed[SMB2_LOCK_HE]));
1486         seq_printf(m, "\nIOCTLs: %d total %d failed",
1487                    atomic_read(&sent[SMB2_IOCTL_HE]),
1488                    atomic_read(&failed[SMB2_IOCTL_HE]));
1489         seq_printf(m, "\nQueryDirectories: %d total %d failed",
1490                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
1491                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
1492         seq_printf(m, "\nChangeNotifies: %d total %d failed",
1493                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
1494                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
1495         seq_printf(m, "\nQueryInfos: %d total %d failed",
1496                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
1497                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
1498         seq_printf(m, "\nSetInfos: %d total %d failed",
1499                    atomic_read(&sent[SMB2_SET_INFO_HE]),
1500                    atomic_read(&failed[SMB2_SET_INFO_HE]));
1501         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
1502                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
1503                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
1504 }
1505
1506 static void
1507 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
1508 {
1509         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
1510         struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
1511
1512         cfile->fid.persistent_fid = fid->persistent_fid;
1513         cfile->fid.volatile_fid = fid->volatile_fid;
1514         cfile->fid.access = fid->access;
1515 #ifdef CONFIG_CIFS_DEBUG2
1516         cfile->fid.mid = fid->mid;
1517 #endif /* CIFS_DEBUG2 */
1518         server->ops->set_oplock_level(cinode, oplock, fid->epoch,
1519                                       &fid->purge_cache);
1520         cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
1521         memcpy(cfile->fid.create_guid, fid->create_guid, 16);
1522 }
1523
1524 static void
1525 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
1526                 struct cifs_fid *fid)
1527 {
1528         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1529 }
1530
1531 static void
1532 smb2_close_getattr(const unsigned int xid, struct cifs_tcon *tcon,
1533                    struct cifsFileInfo *cfile)
1534 {
1535         struct smb2_file_network_open_info file_inf;
1536         struct inode *inode;
1537         int rc;
1538
1539         rc = __SMB2_close(xid, tcon, cfile->fid.persistent_fid,
1540                    cfile->fid.volatile_fid, &file_inf);
1541         if (rc)
1542                 return;
1543
1544         inode = d_inode(cfile->dentry);
1545
1546         spin_lock(&inode->i_lock);
1547         CIFS_I(inode)->time = jiffies;
1548
1549         /* Creation time should not need to be updated on close */
1550         if (file_inf.LastWriteTime)
1551                 inode->i_mtime = cifs_NTtimeToUnix(file_inf.LastWriteTime);
1552         if (file_inf.ChangeTime)
1553                 inode->i_ctime = cifs_NTtimeToUnix(file_inf.ChangeTime);
1554         if (file_inf.LastAccessTime)
1555                 inode->i_atime = cifs_NTtimeToUnix(file_inf.LastAccessTime);
1556
1557         /*
1558          * i_blocks is not related to (i_size / i_blksize),
1559          * but instead 512 byte (2**9) size is required for
1560          * calculating num blocks.
1561          */
1562         if (le64_to_cpu(file_inf.AllocationSize) > 4096)
1563                 inode->i_blocks =
1564                         (512 - 1 + le64_to_cpu(file_inf.AllocationSize)) >> 9;
1565
1566         /* End of file and Attributes should not have to be updated on close */
1567         spin_unlock(&inode->i_lock);
1568 }
1569
1570 static int
1571 SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
1572                      u64 persistent_fid, u64 volatile_fid,
1573                      struct copychunk_ioctl *pcchunk)
1574 {
1575         int rc;
1576         unsigned int ret_data_len;
1577         struct resume_key_req *res_key;
1578
1579         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1580                         FSCTL_SRV_REQUEST_RESUME_KEY, true /* is_fsctl */,
1581                         NULL, 0 /* no input */, CIFSMaxBufSize,
1582                         (char **)&res_key, &ret_data_len);
1583
1584         if (rc == -EOPNOTSUPP) {
1585                 pr_warn_once("Server share %s does not support copy range\n", tcon->treeName);
1586                 goto req_res_key_exit;
1587         } else if (rc) {
1588                 cifs_tcon_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
1589                 goto req_res_key_exit;
1590         }
1591         if (ret_data_len < sizeof(struct resume_key_req)) {
1592                 cifs_tcon_dbg(VFS, "Invalid refcopy resume key length\n");
1593                 rc = -EINVAL;
1594                 goto req_res_key_exit;
1595         }
1596         memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
1597
1598 req_res_key_exit:
1599         kfree(res_key);
1600         return rc;
1601 }
1602
1603 struct iqi_vars {
1604         struct smb_rqst rqst[3];
1605         struct kvec rsp_iov[3];
1606         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1607         struct kvec qi_iov[1];
1608         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
1609         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
1610         struct kvec close_iov[1];
1611 };
1612
1613 static int
1614 smb2_ioctl_query_info(const unsigned int xid,
1615                       struct cifs_tcon *tcon,
1616                       struct cifs_sb_info *cifs_sb,
1617                       __le16 *path, int is_dir,
1618                       unsigned long p)
1619 {
1620         struct iqi_vars *vars;
1621         struct smb_rqst *rqst;
1622         struct kvec *rsp_iov;
1623         struct cifs_ses *ses = tcon->ses;
1624         struct TCP_Server_Info *server = cifs_pick_channel(ses);
1625         char __user *arg = (char __user *)p;
1626         struct smb_query_info qi;
1627         struct smb_query_info __user *pqi;
1628         int rc = 0;
1629         int flags = CIFS_CP_CREATE_CLOSE_OP;
1630         struct smb2_query_info_rsp *qi_rsp = NULL;
1631         struct smb2_ioctl_rsp *io_rsp = NULL;
1632         void *buffer = NULL;
1633         int resp_buftype[3];
1634         struct cifs_open_parms oparms;
1635         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1636         struct cifs_fid fid;
1637         unsigned int size[2];
1638         void *data[2];
1639         int create_options = is_dir ? CREATE_NOT_FILE : CREATE_NOT_DIR;
1640         void (*free_req1_func)(struct smb_rqst *r);
1641
1642         vars = kzalloc(sizeof(*vars), GFP_ATOMIC);
1643         if (vars == NULL)
1644                 return -ENOMEM;
1645         rqst = &vars->rqst[0];
1646         rsp_iov = &vars->rsp_iov[0];
1647
1648         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1649
1650         if (copy_from_user(&qi, arg, sizeof(struct smb_query_info))) {
1651                 rc = -EFAULT;
1652                 goto free_vars;
1653         }
1654         if (qi.output_buffer_length > 1024) {
1655                 rc = -EINVAL;
1656                 goto free_vars;
1657         }
1658
1659         if (!ses || !server) {
1660                 rc = -EIO;
1661                 goto free_vars;
1662         }
1663
1664         if (smb3_encryption_required(tcon))
1665                 flags |= CIFS_TRANSFORM_REQ;
1666
1667         if (qi.output_buffer_length) {
1668                 buffer = memdup_user(arg + sizeof(struct smb_query_info), qi.output_buffer_length);
1669                 if (IS_ERR(buffer)) {
1670                         rc = PTR_ERR(buffer);
1671                         goto free_vars;
1672                 }
1673         }
1674
1675         /* Open */
1676         rqst[0].rq_iov = &vars->open_iov[0];
1677         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1678
1679         memset(&oparms, 0, sizeof(oparms));
1680         oparms.tcon = tcon;
1681         oparms.disposition = FILE_OPEN;
1682         oparms.create_options = cifs_create_options(cifs_sb, create_options);
1683         oparms.fid = &fid;
1684         oparms.reconnect = false;
1685
1686         if (qi.flags & PASSTHRU_FSCTL) {
1687                 switch (qi.info_type & FSCTL_DEVICE_ACCESS_MASK) {
1688                 case FSCTL_DEVICE_ACCESS_FILE_READ_WRITE_ACCESS:
1689                         oparms.desired_access = FILE_READ_DATA | FILE_WRITE_DATA | FILE_READ_ATTRIBUTES | SYNCHRONIZE;
1690                         break;
1691                 case FSCTL_DEVICE_ACCESS_FILE_ANY_ACCESS:
1692                         oparms.desired_access = GENERIC_ALL;
1693                         break;
1694                 case FSCTL_DEVICE_ACCESS_FILE_READ_ACCESS:
1695                         oparms.desired_access = GENERIC_READ;
1696                         break;
1697                 case FSCTL_DEVICE_ACCESS_FILE_WRITE_ACCESS:
1698                         oparms.desired_access = GENERIC_WRITE;
1699                         break;
1700                 }
1701         } else if (qi.flags & PASSTHRU_SET_INFO) {
1702                 oparms.desired_access = GENERIC_WRITE;
1703         } else {
1704                 oparms.desired_access = FILE_READ_ATTRIBUTES | READ_CONTROL;
1705         }
1706
1707         rc = SMB2_open_init(tcon, server,
1708                             &rqst[0], &oplock, &oparms, path);
1709         if (rc)
1710                 goto free_output_buffer;
1711         smb2_set_next_command(tcon, &rqst[0]);
1712
1713         /* Query */
1714         if (qi.flags & PASSTHRU_FSCTL) {
1715                 /* Can eventually relax perm check since server enforces too */
1716                 if (!capable(CAP_SYS_ADMIN)) {
1717                         rc = -EPERM;
1718                         goto free_open_req;
1719                 }
1720                 rqst[1].rq_iov = &vars->io_iov[0];
1721                 rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
1722
1723                 rc = SMB2_ioctl_init(tcon, server, &rqst[1], COMPOUND_FID, COMPOUND_FID,
1724                                      qi.info_type, true, buffer, qi.output_buffer_length,
1725                                      CIFSMaxBufSize - MAX_SMB2_CREATE_RESPONSE_SIZE -
1726                                      MAX_SMB2_CLOSE_RESPONSE_SIZE);
1727                 free_req1_func = SMB2_ioctl_free;
1728         } else if (qi.flags == PASSTHRU_SET_INFO) {
1729                 /* Can eventually relax perm check since server enforces too */
1730                 if (!capable(CAP_SYS_ADMIN)) {
1731                         rc = -EPERM;
1732                         goto free_open_req;
1733                 }
1734                 if (qi.output_buffer_length < 8) {
1735                         rc = -EINVAL;
1736                         goto free_open_req;
1737                 }
1738                 rqst[1].rq_iov = &vars->si_iov[0];
1739                 rqst[1].rq_nvec = 1;
1740
1741                 /* MS-FSCC 2.4.13 FileEndOfFileInformation */
1742                 size[0] = 8;
1743                 data[0] = buffer;
1744
1745                 rc = SMB2_set_info_init(tcon, server, &rqst[1], COMPOUND_FID, COMPOUND_FID,
1746                                         current->tgid, FILE_END_OF_FILE_INFORMATION,
1747                                         SMB2_O_INFO_FILE, 0, data, size);
1748                 free_req1_func = SMB2_set_info_free;
1749         } else if (qi.flags == PASSTHRU_QUERY_INFO) {
1750                 rqst[1].rq_iov = &vars->qi_iov[0];
1751                 rqst[1].rq_nvec = 1;
1752
1753                 rc = SMB2_query_info_init(tcon, server,
1754                                   &rqst[1], COMPOUND_FID,
1755                                   COMPOUND_FID, qi.file_info_class,
1756                                   qi.info_type, qi.additional_information,
1757                                   qi.input_buffer_length,
1758                                   qi.output_buffer_length, buffer);
1759                 free_req1_func = SMB2_query_info_free;
1760         } else { /* unknown flags */
1761                 cifs_tcon_dbg(VFS, "Invalid passthru query flags: 0x%x\n",
1762                               qi.flags);
1763                 rc = -EINVAL;
1764         }
1765
1766         if (rc)
1767                 goto free_open_req;
1768         smb2_set_next_command(tcon, &rqst[1]);
1769         smb2_set_related(&rqst[1]);
1770
1771         /* Close */
1772         rqst[2].rq_iov = &vars->close_iov[0];
1773         rqst[2].rq_nvec = 1;
1774
1775         rc = SMB2_close_init(tcon, server,
1776                              &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
1777         if (rc)
1778                 goto free_req_1;
1779         smb2_set_related(&rqst[2]);
1780
1781         rc = compound_send_recv(xid, ses, server,
1782                                 flags, 3, rqst,
1783                                 resp_buftype, rsp_iov);
1784         if (rc)
1785                 goto out;
1786
1787         /* No need to bump num_remote_opens since handle immediately closed */
1788         if (qi.flags & PASSTHRU_FSCTL) {
1789                 pqi = (struct smb_query_info __user *)arg;
1790                 io_rsp = (struct smb2_ioctl_rsp *)rsp_iov[1].iov_base;
1791                 if (le32_to_cpu(io_rsp->OutputCount) < qi.input_buffer_length)
1792                         qi.input_buffer_length = le32_to_cpu(io_rsp->OutputCount);
1793                 if (qi.input_buffer_length > 0 &&
1794                     le32_to_cpu(io_rsp->OutputOffset) + qi.input_buffer_length
1795                     > rsp_iov[1].iov_len) {
1796                         rc = -EFAULT;
1797                         goto out;
1798                 }
1799
1800                 if (copy_to_user(&pqi->input_buffer_length,
1801                                  &qi.input_buffer_length,
1802                                  sizeof(qi.input_buffer_length))) {
1803                         rc = -EFAULT;
1804                         goto out;
1805                 }
1806
1807                 if (copy_to_user((void __user *)pqi + sizeof(struct smb_query_info),
1808                                  (const void *)io_rsp + le32_to_cpu(io_rsp->OutputOffset),
1809                                  qi.input_buffer_length))
1810                         rc = -EFAULT;
1811         } else {
1812                 pqi = (struct smb_query_info __user *)arg;
1813                 qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
1814                 if (le32_to_cpu(qi_rsp->OutputBufferLength) < qi.input_buffer_length)
1815                         qi.input_buffer_length = le32_to_cpu(qi_rsp->OutputBufferLength);
1816                 if (copy_to_user(&pqi->input_buffer_length,
1817                                  &qi.input_buffer_length,
1818                                  sizeof(qi.input_buffer_length))) {
1819                         rc = -EFAULT;
1820                         goto out;
1821                 }
1822
1823                 if (copy_to_user(pqi + 1, qi_rsp->Buffer,
1824                                  qi.input_buffer_length))
1825                         rc = -EFAULT;
1826         }
1827
1828 out:
1829         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1830         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1831         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1832         SMB2_close_free(&rqst[2]);
1833 free_req_1:
1834         free_req1_func(&rqst[1]);
1835 free_open_req:
1836         SMB2_open_free(&rqst[0]);
1837 free_output_buffer:
1838         kfree(buffer);
1839 free_vars:
1840         kfree(vars);
1841         return rc;
1842 }
1843
1844 static ssize_t
1845 smb2_copychunk_range(const unsigned int xid,
1846                         struct cifsFileInfo *srcfile,
1847                         struct cifsFileInfo *trgtfile, u64 src_off,
1848                         u64 len, u64 dest_off)
1849 {
1850         int rc;
1851         unsigned int ret_data_len;
1852         struct copychunk_ioctl *pcchunk;
1853         struct copychunk_ioctl_rsp *retbuf = NULL;
1854         struct cifs_tcon *tcon;
1855         int chunks_copied = 0;
1856         bool chunk_sizes_updated = false;
1857         ssize_t bytes_written, total_bytes_written = 0;
1858
1859         pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
1860
1861         if (pcchunk == NULL)
1862                 return -ENOMEM;
1863
1864         cifs_dbg(FYI, "%s: about to call request res key\n", __func__);
1865         /* Request a key from the server to identify the source of the copy */
1866         rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
1867                                 srcfile->fid.persistent_fid,
1868                                 srcfile->fid.volatile_fid, pcchunk);
1869
1870         /* Note: request_res_key sets res_key null only if rc !=0 */
1871         if (rc)
1872                 goto cchunk_out;
1873
1874         /* For now array only one chunk long, will make more flexible later */
1875         pcchunk->ChunkCount = cpu_to_le32(1);
1876         pcchunk->Reserved = 0;
1877         pcchunk->Reserved2 = 0;
1878
1879         tcon = tlink_tcon(trgtfile->tlink);
1880
1881         while (len > 0) {
1882                 pcchunk->SourceOffset = cpu_to_le64(src_off);
1883                 pcchunk->TargetOffset = cpu_to_le64(dest_off);
1884                 pcchunk->Length =
1885                         cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));
1886
1887                 /* Request server copy to target from src identified by key */
1888                 kfree(retbuf);
1889                 retbuf = NULL;
1890                 rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1891                         trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
1892                         true /* is_fsctl */, (char *)pcchunk,
1893                         sizeof(struct copychunk_ioctl), CIFSMaxBufSize,
1894                         (char **)&retbuf, &ret_data_len);
1895                 if (rc == 0) {
1896                         if (ret_data_len !=
1897                                         sizeof(struct copychunk_ioctl_rsp)) {
1898                                 cifs_tcon_dbg(VFS, "Invalid cchunk response size\n");
1899                                 rc = -EIO;
1900                                 goto cchunk_out;
1901                         }
1902                         if (retbuf->TotalBytesWritten == 0) {
1903                                 cifs_dbg(FYI, "no bytes copied\n");
1904                                 rc = -EIO;
1905                                 goto cchunk_out;
1906                         }
1907                         /*
1908                          * Check if server claimed to write more than we asked
1909                          */
1910                         if (le32_to_cpu(retbuf->TotalBytesWritten) >
1911                             le32_to_cpu(pcchunk->Length)) {
1912                                 cifs_tcon_dbg(VFS, "Invalid copy chunk response\n");
1913                                 rc = -EIO;
1914                                 goto cchunk_out;
1915                         }
1916                         if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
1917                                 cifs_tcon_dbg(VFS, "Invalid num chunks written\n");
1918                                 rc = -EIO;
1919                                 goto cchunk_out;
1920                         }
1921                         chunks_copied++;
1922
1923                         bytes_written = le32_to_cpu(retbuf->TotalBytesWritten);
1924                         src_off += bytes_written;
1925                         dest_off += bytes_written;
1926                         len -= bytes_written;
1927                         total_bytes_written += bytes_written;
1928
1929                         cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %zu\n",
1930                                 le32_to_cpu(retbuf->ChunksWritten),
1931                                 le32_to_cpu(retbuf->ChunkBytesWritten),
1932                                 bytes_written);
1933                 } else if (rc == -EINVAL) {
1934                         if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
1935                                 goto cchunk_out;
1936
1937                         cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
1938                                 le32_to_cpu(retbuf->ChunksWritten),
1939                                 le32_to_cpu(retbuf->ChunkBytesWritten),
1940                                 le32_to_cpu(retbuf->TotalBytesWritten));
1941
1942                         /*
1943                          * Check if this is the first request using these sizes,
1944                          * (ie check if copy succeed once with original sizes
1945                          * and check if the server gave us different sizes after
1946                          * we already updated max sizes on previous request).
1947                          * if not then why is the server returning an error now
1948                          */
1949                         if ((chunks_copied != 0) || chunk_sizes_updated)
1950                                 goto cchunk_out;
1951
1952                         /* Check that server is not asking us to grow size */
1953                         if (le32_to_cpu(retbuf->ChunkBytesWritten) <
1954                                         tcon->max_bytes_chunk)
1955                                 tcon->max_bytes_chunk =
1956                                         le32_to_cpu(retbuf->ChunkBytesWritten);
1957                         else
1958                                 goto cchunk_out; /* server gave us bogus size */
1959
1960                         /* No need to change MaxChunks since already set to 1 */
1961                         chunk_sizes_updated = true;
1962                 } else
1963                         goto cchunk_out;
1964         }
1965
1966 cchunk_out:
1967         kfree(pcchunk);
1968         kfree(retbuf);
1969         if (rc)
1970                 return rc;
1971         else
1972                 return total_bytes_written;
1973 }
1974
1975 static int
1976 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
1977                 struct cifs_fid *fid)
1978 {
1979         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1980 }
1981
1982 static unsigned int
1983 smb2_read_data_offset(char *buf)
1984 {
1985         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1986
1987         return rsp->DataOffset;
1988 }
1989
1990 static unsigned int
1991 smb2_read_data_length(char *buf, bool in_remaining)
1992 {
1993         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1994
1995         if (in_remaining)
1996                 return le32_to_cpu(rsp->DataRemaining);
1997
1998         return le32_to_cpu(rsp->DataLength);
1999 }
2000
2001
2002 static int
2003 smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
2004                struct cifs_io_parms *parms, unsigned int *bytes_read,
2005                char **buf, int *buf_type)
2006 {
2007         parms->persistent_fid = pfid->persistent_fid;
2008         parms->volatile_fid = pfid->volatile_fid;
2009         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
2010 }
2011
2012 static int
2013 smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
2014                 struct cifs_io_parms *parms, unsigned int *written,
2015                 struct kvec *iov, unsigned long nr_segs)
2016 {
2017
2018         parms->persistent_fid = pfid->persistent_fid;
2019         parms->volatile_fid = pfid->volatile_fid;
2020         return SMB2_write(xid, parms, written, iov, nr_segs);
2021 }
2022
2023 /* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
2024 static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
2025                 struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
2026 {
2027         struct cifsInodeInfo *cifsi;
2028         int rc;
2029
2030         cifsi = CIFS_I(inode);
2031
2032         /* if file already sparse don't bother setting sparse again */
2033         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
2034                 return true; /* already sparse */
2035
2036         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
2037                 return true; /* already not sparse */
2038
2039         /*
2040          * Can't check for sparse support on share the usual way via the
2041          * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
2042          * since Samba server doesn't set the flag on the share, yet
2043          * supports the set sparse FSCTL and returns sparse correctly
2044          * in the file attributes. If we fail setting sparse though we
2045          * mark that server does not support sparse files for this share
2046          * to avoid repeatedly sending the unsupported fsctl to server
2047          * if the file is repeatedly extended.
2048          */
2049         if (tcon->broken_sparse_sup)
2050                 return false;
2051
2052         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
2053                         cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
2054                         true /* is_fctl */,
2055                         &setsparse, 1, CIFSMaxBufSize, NULL, NULL);
2056         if (rc) {
2057                 tcon->broken_sparse_sup = true;
2058                 cifs_dbg(FYI, "set sparse rc = %d\n", rc);
2059                 return false;
2060         }
2061
2062         if (setsparse)
2063                 cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
2064         else
2065                 cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
2066
2067         return true;
2068 }
2069
2070 static int
2071 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
2072                    struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
2073 {
2074         __le64 eof = cpu_to_le64(size);
2075         struct inode *inode;
2076
2077         /*
2078          * If extending file more than one page make sparse. Many Linux fs
2079          * make files sparse by default when extending via ftruncate
2080          */
2081         inode = d_inode(cfile->dentry);
2082
2083         if (!set_alloc && (size > inode->i_size + 8192)) {
2084                 __u8 set_sparse = 1;
2085
2086                 /* whether set sparse succeeds or not, extend the file */
2087                 smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
2088         }
2089
2090         return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
2091                             cfile->fid.volatile_fid, cfile->pid, &eof);
2092 }
2093
2094 static int
2095 smb2_duplicate_extents(const unsigned int xid,
2096                         struct cifsFileInfo *srcfile,
2097                         struct cifsFileInfo *trgtfile, u64 src_off,
2098                         u64 len, u64 dest_off)
2099 {
2100         int rc;
2101         unsigned int ret_data_len;
2102         struct inode *inode;
2103         struct duplicate_extents_to_file dup_ext_buf;
2104         struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
2105
2106         /* server fileays advertise duplicate extent support with this flag */
2107         if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
2108              FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
2109                 return -EOPNOTSUPP;
2110
2111         dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
2112         dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
2113         dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
2114         dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
2115         dup_ext_buf.ByteCount = cpu_to_le64(len);
2116         cifs_dbg(FYI, "Duplicate extents: src off %lld dst off %lld len %lld\n",
2117                 src_off, dest_off, len);
2118
2119         inode = d_inode(trgtfile->dentry);
2120         if (inode->i_size < dest_off + len) {
2121                 rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
2122                 if (rc)
2123                         goto duplicate_extents_out;
2124
2125                 /*
2126                  * Although also could set plausible allocation size (i_blocks)
2127                  * here in addition to setting the file size, in reflink
2128                  * it is likely that the target file is sparse. Its allocation
2129                  * size will be queried on next revalidate, but it is important
2130                  * to make sure that file's cached size is updated immediately
2131                  */
2132                 cifs_setsize(inode, dest_off + len);
2133         }
2134         rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
2135                         trgtfile->fid.volatile_fid,
2136                         FSCTL_DUPLICATE_EXTENTS_TO_FILE,
2137                         true /* is_fsctl */,
2138                         (char *)&dup_ext_buf,
2139                         sizeof(struct duplicate_extents_to_file),
2140                         CIFSMaxBufSize, NULL,
2141                         &ret_data_len);
2142
2143         if (ret_data_len > 0)
2144                 cifs_dbg(FYI, "Non-zero response length in duplicate extents\n");
2145
2146 duplicate_extents_out:
2147         return rc;
2148 }
2149
2150 static int
2151 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2152                    struct cifsFileInfo *cfile)
2153 {
2154         return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
2155                             cfile->fid.volatile_fid);
2156 }
2157
2158 static int
2159 smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
2160                    struct cifsFileInfo *cfile)
2161 {
2162         struct fsctl_set_integrity_information_req integr_info;
2163         unsigned int ret_data_len;
2164
2165         integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
2166         integr_info.Flags = 0;
2167         integr_info.Reserved = 0;
2168
2169         return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
2170                         cfile->fid.volatile_fid,
2171                         FSCTL_SET_INTEGRITY_INFORMATION,
2172                         true /* is_fsctl */,
2173                         (char *)&integr_info,
2174                         sizeof(struct fsctl_set_integrity_information_req),
2175                         CIFSMaxBufSize, NULL,
2176                         &ret_data_len);
2177
2178 }
2179
2180 /* GMT Token is @GMT-YYYY.MM.DD-HH.MM.SS Unicode which is 48 bytes + null */
2181 #define GMT_TOKEN_SIZE 50
2182
2183 #define MIN_SNAPSHOT_ARRAY_SIZE 16 /* See MS-SMB2 section 3.3.5.15.1 */
2184
2185 /*
2186  * Input buffer contains (empty) struct smb_snapshot array with size filled in
2187  * For output see struct SRV_SNAPSHOT_ARRAY in MS-SMB2 section 2.2.32.2
2188  */
2189 static int
2190 smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
2191                    struct cifsFileInfo *cfile, void __user *ioc_buf)
2192 {
2193         char *retbuf = NULL;
2194         unsigned int ret_data_len = 0;
2195         int rc;
2196         u32 max_response_size;
2197         struct smb_snapshot_array snapshot_in;
2198
2199         /*
2200          * On the first query to enumerate the list of snapshots available
2201          * for this volume the buffer begins with 0 (number of snapshots
2202          * which can be returned is zero since at that point we do not know
2203          * how big the buffer needs to be). On the second query,
2204          * it (ret_data_len) is set to number of snapshots so we can
2205          * know to set the maximum response size larger (see below).
2206          */
2207         if (get_user(ret_data_len, (unsigned int __user *)ioc_buf))
2208                 return -EFAULT;
2209
2210         /*
2211          * Note that for snapshot queries that servers like Azure expect that
2212          * the first query be minimal size (and just used to get the number/size
2213          * of previous versions) so response size must be specified as EXACTLY
2214          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2215          * of eight bytes.
2216          */
2217         if (ret_data_len == 0)
2218                 max_response_size = MIN_SNAPSHOT_ARRAY_SIZE;
2219         else
2220                 max_response_size = CIFSMaxBufSize;
2221
2222         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
2223                         cfile->fid.volatile_fid,
2224                         FSCTL_SRV_ENUMERATE_SNAPSHOTS,
2225                         true /* is_fsctl */,
2226                         NULL, 0 /* no input data */, max_response_size,
2227                         (char **)&retbuf,
2228                         &ret_data_len);
2229         cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d\n",
2230                         rc, ret_data_len);
2231         if (rc)
2232                 return rc;
2233
2234         if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) {
2235                 /* Fixup buffer */
2236                 if (copy_from_user(&snapshot_in, ioc_buf,
2237                     sizeof(struct smb_snapshot_array))) {
2238                         rc = -EFAULT;
2239                         kfree(retbuf);
2240                         return rc;
2241                 }
2242
2243                 /*
2244                  * Check for min size, ie not large enough to fit even one GMT
2245                  * token (snapshot).  On the first ioctl some users may pass in
2246                  * smaller size (or zero) to simply get the size of the array
2247                  * so the user space caller can allocate sufficient memory
2248                  * and retry the ioctl again with larger array size sufficient
2249                  * to hold all of the snapshot GMT tokens on the second try.
2250                  */
2251                 if (snapshot_in.snapshot_array_size < GMT_TOKEN_SIZE)
2252                         ret_data_len = sizeof(struct smb_snapshot_array);
2253
2254                 /*
2255                  * We return struct SRV_SNAPSHOT_ARRAY, followed by
2256                  * the snapshot array (of 50 byte GMT tokens) each
2257                  * representing an available previous version of the data
2258                  */
2259                 if (ret_data_len > (snapshot_in.snapshot_array_size +
2260                                         sizeof(struct smb_snapshot_array)))
2261                         ret_data_len = snapshot_in.snapshot_array_size +
2262                                         sizeof(struct smb_snapshot_array);
2263
2264                 if (copy_to_user(ioc_buf, retbuf, ret_data_len))
2265                         rc = -EFAULT;
2266         }
2267
2268         kfree(retbuf);
2269         return rc;
2270 }
2271
2272
2273
2274 static int
2275 smb3_notify(const unsigned int xid, struct file *pfile,
2276             void __user *ioc_buf)
2277 {
2278         struct smb3_notify notify;
2279         struct dentry *dentry = pfile->f_path.dentry;
2280         struct inode *inode = file_inode(pfile);
2281         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2282         struct cifs_open_parms oparms;
2283         struct cifs_fid fid;
2284         struct cifs_tcon *tcon;
2285         const unsigned char *path;
2286         void *page = alloc_dentry_path();
2287         __le16 *utf16_path = NULL;
2288         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2289         int rc = 0;
2290
2291         path = build_path_from_dentry(dentry, page);
2292         if (IS_ERR(path)) {
2293                 rc = PTR_ERR(path);
2294                 goto notify_exit;
2295         }
2296
2297         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2298         if (utf16_path == NULL) {
2299                 rc = -ENOMEM;
2300                 goto notify_exit;
2301         }
2302
2303         if (copy_from_user(&notify, ioc_buf, sizeof(struct smb3_notify))) {
2304                 rc = -EFAULT;
2305                 goto notify_exit;
2306         }
2307
2308         tcon = cifs_sb_master_tcon(cifs_sb);
2309         oparms.tcon = tcon;
2310         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
2311         oparms.disposition = FILE_OPEN;
2312         oparms.create_options = cifs_create_options(cifs_sb, 0);
2313         oparms.fid = &fid;
2314         oparms.reconnect = false;
2315
2316         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
2317                        NULL);
2318         if (rc)
2319                 goto notify_exit;
2320
2321         rc = SMB2_change_notify(xid, tcon, fid.persistent_fid, fid.volatile_fid,
2322                                 notify.watch_tree, notify.completion_filter);
2323
2324         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2325
2326         cifs_dbg(FYI, "change notify for path %s rc %d\n", path, rc);
2327
2328 notify_exit:
2329         free_dentry_path(page);
2330         kfree(utf16_path);
2331         return rc;
2332 }
2333
2334 static int
2335 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
2336                      const char *path, struct cifs_sb_info *cifs_sb,
2337                      struct cifs_fid *fid, __u16 search_flags,
2338                      struct cifs_search_info *srch_inf)
2339 {
2340         __le16 *utf16_path;
2341         struct smb_rqst rqst[2];
2342         struct kvec rsp_iov[2];
2343         int resp_buftype[2];
2344         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2345         struct kvec qd_iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
2346         int rc, flags = 0;
2347         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2348         struct cifs_open_parms oparms;
2349         struct smb2_query_directory_rsp *qd_rsp = NULL;
2350         struct smb2_create_rsp *op_rsp = NULL;
2351         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
2352         int retry_count = 0;
2353
2354         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2355         if (!utf16_path)
2356                 return -ENOMEM;
2357
2358         if (smb3_encryption_required(tcon))
2359                 flags |= CIFS_TRANSFORM_REQ;
2360
2361         memset(rqst, 0, sizeof(rqst));
2362         resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
2363         memset(rsp_iov, 0, sizeof(rsp_iov));
2364
2365         /* Open */
2366         memset(&open_iov, 0, sizeof(open_iov));
2367         rqst[0].rq_iov = open_iov;
2368         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2369
2370         oparms.tcon = tcon;
2371         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
2372         oparms.disposition = FILE_OPEN;
2373         oparms.create_options = cifs_create_options(cifs_sb, 0);
2374         oparms.fid = fid;
2375         oparms.reconnect = false;
2376
2377         rc = SMB2_open_init(tcon, server,
2378                             &rqst[0], &oplock, &oparms, utf16_path);
2379         if (rc)
2380                 goto qdf_free;
2381         smb2_set_next_command(tcon, &rqst[0]);
2382
2383         /* Query directory */
2384         srch_inf->entries_in_buffer = 0;
2385         srch_inf->index_of_last_entry = 2;
2386
2387         memset(&qd_iov, 0, sizeof(qd_iov));
2388         rqst[1].rq_iov = qd_iov;
2389         rqst[1].rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
2390
2391         rc = SMB2_query_directory_init(xid, tcon, server,
2392                                        &rqst[1],
2393                                        COMPOUND_FID, COMPOUND_FID,
2394                                        0, srch_inf->info_level);
2395         if (rc)
2396                 goto qdf_free;
2397
2398         smb2_set_related(&rqst[1]);
2399
2400 again:
2401         rc = compound_send_recv(xid, tcon->ses, server,
2402                                 flags, 2, rqst,
2403                                 resp_buftype, rsp_iov);
2404
2405         if (rc == -EAGAIN && retry_count++ < 10)
2406                 goto again;
2407
2408         /* If the open failed there is nothing to do */
2409         op_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
2410         if (op_rsp == NULL || op_rsp->hdr.Status != STATUS_SUCCESS) {
2411                 cifs_dbg(FYI, "query_dir_first: open failed rc=%d\n", rc);
2412                 goto qdf_free;
2413         }
2414         fid->persistent_fid = op_rsp->PersistentFileId;
2415         fid->volatile_fid = op_rsp->VolatileFileId;
2416
2417         /* Anything else than ENODATA means a genuine error */
2418         if (rc && rc != -ENODATA) {
2419                 SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
2420                 cifs_dbg(FYI, "query_dir_first: query directory failed rc=%d\n", rc);
2421                 trace_smb3_query_dir_err(xid, fid->persistent_fid,
2422                                          tcon->tid, tcon->ses->Suid, 0, 0, rc);
2423                 goto qdf_free;
2424         }
2425
2426         atomic_inc(&tcon->num_remote_opens);
2427
2428         qd_rsp = (struct smb2_query_directory_rsp *)rsp_iov[1].iov_base;
2429         if (qd_rsp->hdr.Status == STATUS_NO_MORE_FILES) {
2430                 trace_smb3_query_dir_done(xid, fid->persistent_fid,
2431                                           tcon->tid, tcon->ses->Suid, 0, 0);
2432                 srch_inf->endOfSearch = true;
2433                 rc = 0;
2434                 goto qdf_free;
2435         }
2436
2437         rc = smb2_parse_query_directory(tcon, &rsp_iov[1], resp_buftype[1],
2438                                         srch_inf);
2439         if (rc) {
2440                 trace_smb3_query_dir_err(xid, fid->persistent_fid, tcon->tid,
2441                         tcon->ses->Suid, 0, 0, rc);
2442                 goto qdf_free;
2443         }
2444         resp_buftype[1] = CIFS_NO_BUFFER;
2445
2446         trace_smb3_query_dir_done(xid, fid->persistent_fid, tcon->tid,
2447                         tcon->ses->Suid, 0, srch_inf->entries_in_buffer);
2448
2449  qdf_free:
2450         kfree(utf16_path);
2451         SMB2_open_free(&rqst[0]);
2452         SMB2_query_directory_free(&rqst[1]);
2453         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2454         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2455         return rc;
2456 }
2457
2458 static int
2459 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
2460                     struct cifs_fid *fid, __u16 search_flags,
2461                     struct cifs_search_info *srch_inf)
2462 {
2463         return SMB2_query_directory(xid, tcon, fid->persistent_fid,
2464                                     fid->volatile_fid, 0, srch_inf);
2465 }
2466
2467 static int
2468 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
2469                struct cifs_fid *fid)
2470 {
2471         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
2472 }
2473
2474 /*
2475  * If we negotiate SMB2 protocol and get STATUS_PENDING - update
2476  * the number of credits and return true. Otherwise - return false.
2477  */
2478 static bool
2479 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server)
2480 {
2481         struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
2482         int scredits, in_flight;
2483
2484         if (shdr->Status != STATUS_PENDING)
2485                 return false;
2486
2487         if (shdr->CreditRequest) {
2488                 spin_lock(&server->req_lock);
2489                 server->credits += le16_to_cpu(shdr->CreditRequest);
2490                 scredits = server->credits;
2491                 in_flight = server->in_flight;
2492                 spin_unlock(&server->req_lock);
2493                 wake_up(&server->request_q);
2494
2495                 trace_smb3_add_credits(server->CurrentMid,
2496                                 server->conn_id, server->hostname, scredits,
2497                                 le16_to_cpu(shdr->CreditRequest), in_flight);
2498                 cifs_dbg(FYI, "%s: status pending add %u credits total=%d\n",
2499                                 __func__, le16_to_cpu(shdr->CreditRequest), scredits);
2500         }
2501
2502         return true;
2503 }
2504
2505 static bool
2506 smb2_is_session_expired(char *buf)
2507 {
2508         struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
2509
2510         if (shdr->Status != STATUS_NETWORK_SESSION_EXPIRED &&
2511             shdr->Status != STATUS_USER_SESSION_DELETED)
2512                 return false;
2513
2514         trace_smb3_ses_expired(le32_to_cpu(shdr->Id.SyncId.TreeId),
2515                                le64_to_cpu(shdr->SessionId),
2516                                le16_to_cpu(shdr->Command),
2517                                le64_to_cpu(shdr->MessageId));
2518         cifs_dbg(FYI, "Session expired or deleted\n");
2519
2520         return true;
2521 }
2522
2523 static bool
2524 smb2_is_status_io_timeout(char *buf)
2525 {
2526         struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
2527
2528         if (shdr->Status == STATUS_IO_TIMEOUT)
2529                 return true;
2530         else
2531                 return false;
2532 }
2533
2534 static void
2535 smb2_is_network_name_deleted(char *buf, struct TCP_Server_Info *server)
2536 {
2537         struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
2538         struct list_head *tmp, *tmp1;
2539         struct cifs_ses *ses;
2540         struct cifs_tcon *tcon;
2541
2542         if (shdr->Status != STATUS_NETWORK_NAME_DELETED)
2543                 return;
2544
2545         spin_lock(&cifs_tcp_ses_lock);
2546         list_for_each(tmp, &server->smb_ses_list) {
2547                 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
2548                 list_for_each(tmp1, &ses->tcon_list) {
2549                         tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
2550                         if (tcon->tid == le32_to_cpu(shdr->Id.SyncId.TreeId)) {
2551                                 tcon->need_reconnect = true;
2552                                 spin_unlock(&cifs_tcp_ses_lock);
2553                                 pr_warn_once("Server share %s deleted.\n",
2554                                              tcon->treeName);
2555                                 return;
2556                         }
2557                 }
2558         }
2559         spin_unlock(&cifs_tcp_ses_lock);
2560 }
2561
2562 static int
2563 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
2564                      struct cifsInodeInfo *cinode)
2565 {
2566         if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
2567                 return SMB2_lease_break(0, tcon, cinode->lease_key,
2568                                         smb2_get_lease_state(cinode));
2569
2570         return SMB2_oplock_break(0, tcon, fid->persistent_fid,
2571                                  fid->volatile_fid,
2572                                  CIFS_CACHE_READ(cinode) ? 1 : 0);
2573 }
2574
2575 void
2576 smb2_set_related(struct smb_rqst *rqst)
2577 {
2578         struct smb2_hdr *shdr;
2579
2580         shdr = (struct smb2_hdr *)(rqst->rq_iov[0].iov_base);
2581         if (shdr == NULL) {
2582                 cifs_dbg(FYI, "shdr NULL in smb2_set_related\n");
2583                 return;
2584         }
2585         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2586 }
2587
2588 char smb2_padding[7] = {0, 0, 0, 0, 0, 0, 0};
2589
2590 void
2591 smb2_set_next_command(struct cifs_tcon *tcon, struct smb_rqst *rqst)
2592 {
2593         struct smb2_hdr *shdr;
2594         struct cifs_ses *ses = tcon->ses;
2595         struct TCP_Server_Info *server = ses->server;
2596         unsigned long len = smb_rqst_len(server, rqst);
2597         int i, num_padding;
2598
2599         shdr = (struct smb2_hdr *)(rqst->rq_iov[0].iov_base);
2600         if (shdr == NULL) {
2601                 cifs_dbg(FYI, "shdr NULL in smb2_set_next_command\n");
2602                 return;
2603         }
2604
2605         /* SMB headers in a compound are 8 byte aligned. */
2606
2607         /* No padding needed */
2608         if (!(len & 7))
2609                 goto finished;
2610
2611         num_padding = 8 - (len & 7);
2612         if (!smb3_encryption_required(tcon)) {
2613                 /*
2614                  * If we do not have encryption then we can just add an extra
2615                  * iov for the padding.
2616                  */
2617                 rqst->rq_iov[rqst->rq_nvec].iov_base = smb2_padding;
2618                 rqst->rq_iov[rqst->rq_nvec].iov_len = num_padding;
2619                 rqst->rq_nvec++;
2620                 len += num_padding;
2621         } else {
2622                 /*
2623                  * We can not add a small padding iov for the encryption case
2624                  * because the encryption framework can not handle the padding
2625                  * iovs.
2626                  * We have to flatten this into a single buffer and add
2627                  * the padding to it.
2628                  */
2629                 for (i = 1; i < rqst->rq_nvec; i++) {
2630                         memcpy(rqst->rq_iov[0].iov_base +
2631                                rqst->rq_iov[0].iov_len,
2632                                rqst->rq_iov[i].iov_base,
2633                                rqst->rq_iov[i].iov_len);
2634                         rqst->rq_iov[0].iov_len += rqst->rq_iov[i].iov_len;
2635                 }
2636                 memset(rqst->rq_iov[0].iov_base + rqst->rq_iov[0].iov_len,
2637                        0, num_padding);
2638                 rqst->rq_iov[0].iov_len += num_padding;
2639                 len += num_padding;
2640                 rqst->rq_nvec = 1;
2641         }
2642
2643  finished:
2644         shdr->NextCommand = cpu_to_le32(len);
2645 }
2646
2647 /*
2648  * Passes the query info response back to the caller on success.
2649  * Caller need to free this with free_rsp_buf().
2650  */
2651 int
2652 smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
2653                          const char *path, u32 desired_access,
2654                          u32 class, u32 type, u32 output_len,
2655                          struct kvec *rsp, int *buftype,
2656                          struct cifs_sb_info *cifs_sb)
2657 {
2658         struct cifs_ses *ses = tcon->ses;
2659         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2660         int flags = CIFS_CP_CREATE_CLOSE_OP;
2661         struct smb_rqst rqst[3];
2662         int resp_buftype[3];
2663         struct kvec rsp_iov[3];
2664         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2665         struct kvec qi_iov[1];
2666         struct kvec close_iov[1];
2667         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2668         struct cifs_open_parms oparms;
2669         struct cifs_fid fid;
2670         int rc;
2671         __le16 *utf16_path;
2672         struct cached_fid *cfid = NULL;
2673
2674         if (!path)
2675                 path = "";
2676         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2677         if (!utf16_path)
2678                 return -ENOMEM;
2679
2680         if (smb3_encryption_required(tcon))
2681                 flags |= CIFS_TRANSFORM_REQ;
2682
2683         memset(rqst, 0, sizeof(rqst));
2684         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
2685         memset(rsp_iov, 0, sizeof(rsp_iov));
2686
2687         rc = open_cached_dir(xid, tcon, path, cifs_sb, &cfid);
2688
2689         memset(&open_iov, 0, sizeof(open_iov));
2690         rqst[0].rq_iov = open_iov;
2691         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2692
2693         oparms.tcon = tcon;
2694         oparms.desired_access = desired_access;
2695         oparms.disposition = FILE_OPEN;
2696         oparms.create_options = cifs_create_options(cifs_sb, 0);
2697         oparms.fid = &fid;
2698         oparms.reconnect = false;
2699
2700         rc = SMB2_open_init(tcon, server,
2701                             &rqst[0], &oplock, &oparms, utf16_path);
2702         if (rc)
2703                 goto qic_exit;
2704         smb2_set_next_command(tcon, &rqst[0]);
2705
2706         memset(&qi_iov, 0, sizeof(qi_iov));
2707         rqst[1].rq_iov = qi_iov;
2708         rqst[1].rq_nvec = 1;
2709
2710         if (cfid) {
2711                 rc = SMB2_query_info_init(tcon, server,
2712                                           &rqst[1],
2713                                           cfid->fid->persistent_fid,
2714                                           cfid->fid->volatile_fid,
2715                                           class, type, 0,
2716                                           output_len, 0,
2717                                           NULL);
2718         } else {
2719                 rc = SMB2_query_info_init(tcon, server,
2720                                           &rqst[1],
2721                                           COMPOUND_FID,
2722                                           COMPOUND_FID,
2723                                           class, type, 0,
2724                                           output_len, 0,
2725                                           NULL);
2726         }
2727         if (rc)
2728                 goto qic_exit;
2729         if (!cfid) {
2730                 smb2_set_next_command(tcon, &rqst[1]);
2731                 smb2_set_related(&rqst[1]);
2732         }
2733
2734         memset(&close_iov, 0, sizeof(close_iov));
2735         rqst[2].rq_iov = close_iov;
2736         rqst[2].rq_nvec = 1;
2737
2738         rc = SMB2_close_init(tcon, server,
2739                              &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
2740         if (rc)
2741                 goto qic_exit;
2742         smb2_set_related(&rqst[2]);
2743
2744         if (cfid) {
2745                 rc = compound_send_recv(xid, ses, server,
2746                                         flags, 1, &rqst[1],
2747                                         &resp_buftype[1], &rsp_iov[1]);
2748         } else {
2749                 rc = compound_send_recv(xid, ses, server,
2750                                         flags, 3, rqst,
2751                                         resp_buftype, rsp_iov);
2752         }
2753         if (rc) {
2754                 free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2755                 if (rc == -EREMCHG) {
2756                         tcon->need_reconnect = true;
2757                         pr_warn_once("server share %s deleted\n",
2758                                      tcon->treeName);
2759                 }
2760                 goto qic_exit;
2761         }
2762         *rsp = rsp_iov[1];
2763         *buftype = resp_buftype[1];
2764
2765  qic_exit:
2766         kfree(utf16_path);
2767         SMB2_open_free(&rqst[0]);
2768         SMB2_query_info_free(&rqst[1]);
2769         SMB2_close_free(&rqst[2]);
2770         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2771         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
2772         if (cfid)
2773                 close_cached_dir(cfid);
2774         return rc;
2775 }
2776
2777 static int
2778 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2779              struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
2780 {
2781         struct smb2_query_info_rsp *rsp;
2782         struct smb2_fs_full_size_info *info = NULL;
2783         struct kvec rsp_iov = {NULL, 0};
2784         int buftype = CIFS_NO_BUFFER;
2785         int rc;
2786
2787
2788         rc = smb2_query_info_compound(xid, tcon, "",
2789                                       FILE_READ_ATTRIBUTES,
2790                                       FS_FULL_SIZE_INFORMATION,
2791                                       SMB2_O_INFO_FILESYSTEM,
2792                                       sizeof(struct smb2_fs_full_size_info),
2793                                       &rsp_iov, &buftype, cifs_sb);
2794         if (rc)
2795                 goto qfs_exit;
2796
2797         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2798         buf->f_type = SMB2_SUPER_MAGIC;
2799         info = (struct smb2_fs_full_size_info *)(
2800                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
2801         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
2802                                le32_to_cpu(rsp->OutputBufferLength),
2803                                &rsp_iov,
2804                                sizeof(struct smb2_fs_full_size_info));
2805         if (!rc)
2806                 smb2_copy_fs_info_to_kstatfs(info, buf);
2807
2808 qfs_exit:
2809         free_rsp_buf(buftype, rsp_iov.iov_base);
2810         return rc;
2811 }
2812
2813 static int
2814 smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2815                struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
2816 {
2817         int rc;
2818         __le16 srch_path = 0; /* Null - open root of share */
2819         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2820         struct cifs_open_parms oparms;
2821         struct cifs_fid fid;
2822
2823         if (!tcon->posix_extensions)
2824                 return smb2_queryfs(xid, tcon, cifs_sb, buf);
2825
2826         oparms.tcon = tcon;
2827         oparms.desired_access = FILE_READ_ATTRIBUTES;
2828         oparms.disposition = FILE_OPEN;
2829         oparms.create_options = cifs_create_options(cifs_sb, 0);
2830         oparms.fid = &fid;
2831         oparms.reconnect = false;
2832
2833         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
2834                        NULL, NULL);
2835         if (rc)
2836                 return rc;
2837
2838         rc = SMB311_posix_qfs_info(xid, tcon, fid.persistent_fid,
2839                                    fid.volatile_fid, buf);
2840         buf->f_type = SMB2_SUPER_MAGIC;
2841         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2842         return rc;
2843 }
2844
2845 static bool
2846 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
2847 {
2848         return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
2849                ob1->fid.volatile_fid == ob2->fid.volatile_fid;
2850 }
2851
2852 static int
2853 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
2854                __u64 length, __u32 type, int lock, int unlock, bool wait)
2855 {
2856         if (unlock && !lock)
2857                 type = SMB2_LOCKFLAG_UNLOCK;
2858         return SMB2_lock(xid, tlink_tcon(cfile->tlink),
2859                          cfile->fid.persistent_fid, cfile->fid.volatile_fid,
2860                          current->tgid, length, offset, type, wait);
2861 }
2862
2863 static void
2864 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
2865 {
2866         memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
2867 }
2868
2869 static void
2870 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
2871 {
2872         memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
2873 }
2874
2875 static void
2876 smb2_new_lease_key(struct cifs_fid *fid)
2877 {
2878         generate_random_uuid(fid->lease_key);
2879 }
2880
2881 static int
2882 smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
2883                    const char *search_name,
2884                    struct dfs_info3_param **target_nodes,
2885                    unsigned int *num_of_nodes,
2886                    const struct nls_table *nls_codepage, int remap)
2887 {
2888         int rc;
2889         __le16 *utf16_path = NULL;
2890         int utf16_path_len = 0;
2891         struct cifs_tcon *tcon;
2892         struct fsctl_get_dfs_referral_req *dfs_req = NULL;
2893         struct get_dfs_referral_rsp *dfs_rsp = NULL;
2894         u32 dfs_req_size = 0, dfs_rsp_size = 0;
2895         int retry_count = 0;
2896
2897         cifs_dbg(FYI, "%s: path: %s\n", __func__, search_name);
2898
2899         /*
2900          * Try to use the IPC tcon, otherwise just use any
2901          */
2902         tcon = ses->tcon_ipc;
2903         if (tcon == NULL) {
2904                 spin_lock(&cifs_tcp_ses_lock);
2905                 tcon = list_first_entry_or_null(&ses->tcon_list,
2906                                                 struct cifs_tcon,
2907                                                 tcon_list);
2908                 if (tcon)
2909                         tcon->tc_count++;
2910                 spin_unlock(&cifs_tcp_ses_lock);
2911         }
2912
2913         if (tcon == NULL) {
2914                 cifs_dbg(VFS, "session %p has no tcon available for a dfs referral request\n",
2915                          ses);
2916                 rc = -ENOTCONN;
2917                 goto out;
2918         }
2919
2920         utf16_path = cifs_strndup_to_utf16(search_name, PATH_MAX,
2921                                            &utf16_path_len,
2922                                            nls_codepage, remap);
2923         if (!utf16_path) {
2924                 rc = -ENOMEM;
2925                 goto out;
2926         }
2927
2928         dfs_req_size = sizeof(*dfs_req) + utf16_path_len;
2929         dfs_req = kzalloc(dfs_req_size, GFP_KERNEL);
2930         if (!dfs_req) {
2931                 rc = -ENOMEM;
2932                 goto out;
2933         }
2934
2935         /* Highest DFS referral version understood */
2936         dfs_req->MaxReferralLevel = DFS_VERSION;
2937
2938         /* Path to resolve in an UTF-16 null-terminated string */
2939         memcpy(dfs_req->RequestFileName, utf16_path, utf16_path_len);
2940
2941         do {
2942                 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
2943                                 FSCTL_DFS_GET_REFERRALS,
2944                                 true /* is_fsctl */,
2945                                 (char *)dfs_req, dfs_req_size, CIFSMaxBufSize,
2946                                 (char **)&dfs_rsp, &dfs_rsp_size);
2947                 if (!is_retryable_error(rc))
2948                         break;
2949                 usleep_range(512, 2048);
2950         } while (++retry_count < 5);
2951
2952         if (rc) {
2953                 if (!is_retryable_error(rc) && rc != -ENOENT && rc != -EOPNOTSUPP)
2954                         cifs_tcon_dbg(VFS, "%s: ioctl error: rc=%d\n", __func__, rc);
2955                 goto out;
2956         }
2957
2958         rc = parse_dfs_referrals(dfs_rsp, dfs_rsp_size,
2959                                  num_of_nodes, target_nodes,
2960                                  nls_codepage, remap, search_name,
2961                                  true /* is_unicode */);
2962         if (rc) {
2963                 cifs_tcon_dbg(VFS, "parse error in %s rc=%d\n", __func__, rc);
2964                 goto out;
2965         }
2966
2967  out:
2968         if (tcon && !tcon->ipc) {
2969                 /* ipc tcons are not refcounted */
2970                 spin_lock(&cifs_tcp_ses_lock);
2971                 tcon->tc_count--;
2972                 /* tc_count can never go negative */
2973                 WARN_ON(tcon->tc_count < 0);
2974                 spin_unlock(&cifs_tcp_ses_lock);
2975         }
2976         kfree(utf16_path);
2977         kfree(dfs_req);
2978         kfree(dfs_rsp);
2979         return rc;
2980 }
2981
2982 static int
2983 parse_reparse_posix(struct reparse_posix_data *symlink_buf,
2984                       u32 plen, char **target_path,
2985                       struct cifs_sb_info *cifs_sb)
2986 {
2987         unsigned int len;
2988
2989         /* See MS-FSCC 2.1.2.6 for the 'NFS' style reparse tags */
2990         len = le16_to_cpu(symlink_buf->ReparseDataLength);
2991
2992         if (le64_to_cpu(symlink_buf->InodeType) != NFS_SPECFILE_LNK) {
2993                 cifs_dbg(VFS, "%lld not a supported symlink type\n",
2994                         le64_to_cpu(symlink_buf->InodeType));
2995                 return -EOPNOTSUPP;
2996         }
2997
2998         *target_path = cifs_strndup_from_utf16(
2999                                 symlink_buf->PathBuffer,
3000                                 len, true, cifs_sb->local_nls);
3001         if (!(*target_path))
3002                 return -ENOMEM;
3003
3004         convert_delimiter(*target_path, '/');
3005         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
3006
3007         return 0;
3008 }
3009
3010 static int
3011 parse_reparse_symlink(struct reparse_symlink_data_buffer *symlink_buf,
3012                       u32 plen, char **target_path,
3013                       struct cifs_sb_info *cifs_sb)
3014 {
3015         unsigned int sub_len;
3016         unsigned int sub_offset;
3017
3018         /* We handle Symbolic Link reparse tag here. See: MS-FSCC 2.1.2.4 */
3019
3020         sub_offset = le16_to_cpu(symlink_buf->SubstituteNameOffset);
3021         sub_len = le16_to_cpu(symlink_buf->SubstituteNameLength);
3022         if (sub_offset + 20 > plen ||
3023             sub_offset + sub_len + 20 > plen) {
3024                 cifs_dbg(VFS, "srv returned malformed symlink buffer\n");
3025                 return -EIO;
3026         }
3027
3028         *target_path = cifs_strndup_from_utf16(
3029                                 symlink_buf->PathBuffer + sub_offset,
3030                                 sub_len, true, cifs_sb->local_nls);
3031         if (!(*target_path))
3032                 return -ENOMEM;
3033
3034         convert_delimiter(*target_path, '/');
3035         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
3036
3037         return 0;
3038 }
3039
3040 static int
3041 parse_reparse_point(struct reparse_data_buffer *buf,
3042                     u32 plen, char **target_path,
3043                     struct cifs_sb_info *cifs_sb)
3044 {
3045         if (plen < sizeof(struct reparse_data_buffer)) {
3046                 cifs_dbg(VFS, "reparse buffer is too small. Must be at least 8 bytes but was %d\n",
3047                          plen);
3048                 return -EIO;
3049         }
3050
3051         if (plen < le16_to_cpu(buf->ReparseDataLength) +
3052             sizeof(struct reparse_data_buffer)) {
3053                 cifs_dbg(VFS, "srv returned invalid reparse buf length: %d\n",
3054                          plen);
3055                 return -EIO;
3056         }
3057
3058         /* See MS-FSCC 2.1.2 */
3059         switch (le32_to_cpu(buf->ReparseTag)) {
3060         case IO_REPARSE_TAG_NFS:
3061                 return parse_reparse_posix(
3062                         (struct reparse_posix_data *)buf,
3063                         plen, target_path, cifs_sb);
3064         case IO_REPARSE_TAG_SYMLINK:
3065                 return parse_reparse_symlink(
3066                         (struct reparse_symlink_data_buffer *)buf,
3067                         plen, target_path, cifs_sb);
3068         default:
3069                 cifs_dbg(VFS, "srv returned unknown symlink buffer tag:0x%08x\n",
3070                          le32_to_cpu(buf->ReparseTag));
3071                 return -EOPNOTSUPP;
3072         }
3073 }
3074
3075 #define SMB2_SYMLINK_STRUCT_SIZE \
3076         (sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
3077
3078 static int
3079 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
3080                    struct cifs_sb_info *cifs_sb, const char *full_path,
3081                    char **target_path, bool is_reparse_point)
3082 {
3083         int rc;
3084         __le16 *utf16_path = NULL;
3085         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
3086         struct cifs_open_parms oparms;
3087         struct cifs_fid fid;
3088         struct kvec err_iov = {NULL, 0};
3089         struct smb2_err_rsp *err_buf = NULL;
3090         struct smb2_symlink_err_rsp *symlink;
3091         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
3092         unsigned int sub_len;
3093         unsigned int sub_offset;
3094         unsigned int print_len;
3095         unsigned int print_offset;
3096         int flags = CIFS_CP_CREATE_CLOSE_OP;
3097         struct smb_rqst rqst[3];
3098         int resp_buftype[3];
3099         struct kvec rsp_iov[3];
3100         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
3101         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
3102         struct kvec close_iov[1];
3103         struct smb2_create_rsp *create_rsp;
3104         struct smb2_ioctl_rsp *ioctl_rsp;
3105         struct reparse_data_buffer *reparse_buf;
3106         int create_options = is_reparse_point ? OPEN_REPARSE_POINT : 0;
3107         u32 plen;
3108
3109         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
3110
3111         *target_path = NULL;
3112
3113         if (smb3_encryption_required(tcon))
3114                 flags |= CIFS_TRANSFORM_REQ;
3115
3116         memset(rqst, 0, sizeof(rqst));
3117         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
3118         memset(rsp_iov, 0, sizeof(rsp_iov));
3119
3120         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
3121         if (!utf16_path)
3122                 return -ENOMEM;
3123
3124         /* Open */
3125         memset(&open_iov, 0, sizeof(open_iov));
3126         rqst[0].rq_iov = open_iov;
3127         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
3128
3129         memset(&oparms, 0, sizeof(oparms));
3130         oparms.tcon = tcon;
3131         oparms.desired_access = FILE_READ_ATTRIBUTES;
3132         oparms.disposition = FILE_OPEN;
3133         oparms.create_options = cifs_create_options(cifs_sb, create_options);
3134         oparms.fid = &fid;
3135         oparms.reconnect = false;
3136
3137         rc = SMB2_open_init(tcon, server,
3138                             &rqst[0], &oplock, &oparms, utf16_path);
3139         if (rc)
3140                 goto querty_exit;
3141         smb2_set_next_command(tcon, &rqst[0]);
3142
3143
3144         /* IOCTL */
3145         memset(&io_iov, 0, sizeof(io_iov));
3146         rqst[1].rq_iov = io_iov;
3147         rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
3148
3149         rc = SMB2_ioctl_init(tcon, server,
3150                              &rqst[1], fid.persistent_fid,
3151                              fid.volatile_fid, FSCTL_GET_REPARSE_POINT,
3152                              true /* is_fctl */, NULL, 0,
3153                              CIFSMaxBufSize -
3154                              MAX_SMB2_CREATE_RESPONSE_SIZE -
3155                              MAX_SMB2_CLOSE_RESPONSE_SIZE);
3156         if (rc)
3157                 goto querty_exit;
3158
3159         smb2_set_next_command(tcon, &rqst[1]);
3160         smb2_set_related(&rqst[1]);
3161
3162
3163         /* Close */
3164         memset(&close_iov, 0, sizeof(close_iov));
3165         rqst[2].rq_iov = close_iov;
3166         rqst[2].rq_nvec = 1;
3167
3168         rc = SMB2_close_init(tcon, server,
3169                              &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
3170         if (rc)
3171                 goto querty_exit;
3172
3173         smb2_set_related(&rqst[2]);
3174
3175         rc = compound_send_recv(xid, tcon->ses, server,
3176                                 flags, 3, rqst,
3177                                 resp_buftype, rsp_iov);
3178
3179         create_rsp = rsp_iov[0].iov_base;
3180         if (create_rsp && create_rsp->hdr.Status)
3181                 err_iov = rsp_iov[0];
3182         ioctl_rsp = rsp_iov[1].iov_base;
3183
3184         /*
3185          * Open was successful and we got an ioctl response.
3186          */
3187         if ((rc == 0) && (is_reparse_point)) {
3188                 /* See MS-FSCC 2.3.23 */
3189
3190                 reparse_buf = (struct reparse_data_buffer *)
3191                         ((char *)ioctl_rsp +
3192                          le32_to_cpu(ioctl_rsp->OutputOffset));
3193                 plen = le32_to_cpu(ioctl_rsp->OutputCount);
3194
3195                 if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) >
3196                     rsp_iov[1].iov_len) {
3197                         cifs_tcon_dbg(VFS, "srv returned invalid ioctl len: %d\n",
3198                                  plen);
3199                         rc = -EIO;
3200                         goto querty_exit;
3201                 }
3202
3203                 rc = parse_reparse_point(reparse_buf, plen, target_path,
3204                                          cifs_sb);
3205                 goto querty_exit;
3206         }
3207
3208         if (!rc || !err_iov.iov_base) {
3209                 rc = -ENOENT;
3210                 goto querty_exit;
3211         }
3212
3213         err_buf = err_iov.iov_base;
3214         if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
3215             err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE) {
3216                 rc = -EINVAL;
3217                 goto querty_exit;
3218         }
3219
3220         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
3221         if (le32_to_cpu(symlink->SymLinkErrorTag) != SYMLINK_ERROR_TAG ||
3222             le32_to_cpu(symlink->ReparseTag) != IO_REPARSE_TAG_SYMLINK) {
3223                 rc = -EINVAL;
3224                 goto querty_exit;
3225         }
3226
3227         /* open must fail on symlink - reset rc */
3228         rc = 0;
3229         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
3230         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
3231         print_len = le16_to_cpu(symlink->PrintNameLength);
3232         print_offset = le16_to_cpu(symlink->PrintNameOffset);
3233
3234         if (err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
3235                 rc = -EINVAL;
3236                 goto querty_exit;
3237         }
3238
3239         if (err_iov.iov_len <
3240             SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
3241                 rc = -EINVAL;
3242                 goto querty_exit;
3243         }
3244
3245         *target_path = cifs_strndup_from_utf16(
3246                                 (char *)symlink->PathBuffer + sub_offset,
3247                                 sub_len, true, cifs_sb->local_nls);
3248         if (!(*target_path)) {
3249                 rc = -ENOMEM;
3250                 goto querty_exit;
3251         }
3252         convert_delimiter(*target_path, '/');
3253         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
3254
3255  querty_exit:
3256         cifs_dbg(FYI, "query symlink rc %d\n", rc);
3257         kfree(utf16_path);
3258         SMB2_open_free(&rqst[0]);
3259         SMB2_ioctl_free(&rqst[1]);
3260         SMB2_close_free(&rqst[2]);
3261         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
3262         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
3263         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
3264         return rc;
3265 }
3266
3267 int
3268 smb2_query_reparse_tag(const unsigned int xid, struct cifs_tcon *tcon,
3269                    struct cifs_sb_info *cifs_sb, const char *full_path,
3270                    __u32 *tag)
3271 {
3272         int rc;
3273         __le16 *utf16_path = NULL;
3274         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
3275         struct cifs_open_parms oparms;
3276         struct cifs_fid fid;
3277         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
3278         int flags = CIFS_CP_CREATE_CLOSE_OP;
3279         struct smb_rqst rqst[3];
3280         int resp_buftype[3];
3281         struct kvec rsp_iov[3];
3282         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
3283         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
3284         struct kvec close_iov[1];
3285         struct smb2_ioctl_rsp *ioctl_rsp;
3286         struct reparse_data_buffer *reparse_buf;
3287         u32 plen;
3288
3289         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
3290
3291         if (smb3_encryption_required(tcon))
3292                 flags |= CIFS_TRANSFORM_REQ;
3293
3294         memset(rqst, 0, sizeof(rqst));
3295         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
3296         memset(rsp_iov, 0, sizeof(rsp_iov));
3297
3298         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
3299         if (!utf16_path)
3300                 return -ENOMEM;
3301
3302         /*
3303          * setup smb2open - TODO add optimization to call cifs_get_readable_path
3304          * to see if there is a handle already open that we can use
3305          */
3306         memset(&open_iov, 0, sizeof(open_iov));
3307         rqst[0].rq_iov = open_iov;
3308         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
3309
3310         memset(&oparms, 0, sizeof(oparms));
3311         oparms.tcon = tcon;
3312         oparms.desired_access = FILE_READ_ATTRIBUTES;
3313         oparms.disposition = FILE_OPEN;
3314         oparms.create_options = cifs_create_options(cifs_sb, OPEN_REPARSE_POINT);
3315         oparms.fid = &fid;
3316         oparms.reconnect = false;
3317
3318         rc = SMB2_open_init(tcon, server,
3319                             &rqst[0], &oplock, &oparms, utf16_path);
3320         if (rc)
3321                 goto query_rp_exit;
3322         smb2_set_next_command(tcon, &rqst[0]);
3323
3324
3325         /* IOCTL */
3326         memset(&io_iov, 0, sizeof(io_iov));
3327         rqst[1].rq_iov = io_iov;
3328         rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
3329
3330         rc = SMB2_ioctl_init(tcon, server,
3331                              &rqst[1], COMPOUND_FID,
3332                              COMPOUND_FID, FSCTL_GET_REPARSE_POINT,
3333                              true /* is_fctl */, NULL, 0,
3334                              CIFSMaxBufSize -
3335                              MAX_SMB2_CREATE_RESPONSE_SIZE -
3336                              MAX_SMB2_CLOSE_RESPONSE_SIZE);
3337         if (rc)
3338                 goto query_rp_exit;
3339
3340         smb2_set_next_command(tcon, &rqst[1]);
3341         smb2_set_related(&rqst[1]);
3342
3343
3344         /* Close */
3345         memset(&close_iov, 0, sizeof(close_iov));
3346         rqst[2].rq_iov = close_iov;
3347         rqst[2].rq_nvec = 1;
3348
3349         rc = SMB2_close_init(tcon, server,
3350                              &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
3351         if (rc)
3352                 goto query_rp_exit;
3353
3354         smb2_set_related(&rqst[2]);
3355
3356         rc = compound_send_recv(xid, tcon->ses, server,
3357                                 flags, 3, rqst,
3358                                 resp_buftype, rsp_iov);
3359
3360         ioctl_rsp = rsp_iov[1].iov_base;
3361
3362         /*
3363          * Open was successful and we got an ioctl response.
3364          */
3365         if (rc == 0) {
3366                 /* See MS-FSCC 2.3.23 */
3367
3368                 reparse_buf = (struct reparse_data_buffer *)
3369                         ((char *)ioctl_rsp +
3370                          le32_to_cpu(ioctl_rsp->OutputOffset));
3371                 plen = le32_to_cpu(ioctl_rsp->OutputCount);
3372
3373                 if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) >
3374                     rsp_iov[1].iov_len) {
3375                         cifs_tcon_dbg(FYI, "srv returned invalid ioctl len: %d\n",
3376                                  plen);
3377                         rc = -EIO;
3378                         goto query_rp_exit;
3379                 }
3380                 *tag = le32_to_cpu(reparse_buf->ReparseTag);
3381         }
3382
3383  query_rp_exit:
3384         kfree(utf16_path);
3385         SMB2_open_free(&rqst[0]);
3386         SMB2_ioctl_free(&rqst[1]);
3387         SMB2_close_free(&rqst[2]);
3388         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
3389         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
3390         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
3391         return rc;
3392 }
3393
3394 static struct cifs_ntsd *
3395 get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
3396                     const struct cifs_fid *cifsfid, u32 *pacllen, u32 info)
3397 {
3398         struct cifs_ntsd *pntsd = NULL;
3399         unsigned int xid;
3400         int rc = -EOPNOTSUPP;
3401         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
3402
3403         if (IS_ERR(tlink))
3404                 return ERR_CAST(tlink);
3405
3406         xid = get_xid();
3407         cifs_dbg(FYI, "trying to get acl\n");
3408
3409         rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
3410                             cifsfid->volatile_fid, (void **)&pntsd, pacllen,
3411                             info);
3412         free_xid(xid);
3413
3414         cifs_put_tlink(tlink);
3415
3416         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
3417         if (rc)
3418                 return ERR_PTR(rc);
3419         return pntsd;
3420
3421 }
3422
3423 static struct cifs_ntsd *
3424 get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
3425                      const char *path, u32 *pacllen, u32 info)
3426 {
3427         struct cifs_ntsd *pntsd = NULL;
3428         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
3429         unsigned int xid;
3430         int rc;
3431         struct cifs_tcon *tcon;
3432         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
3433         struct cifs_fid fid;
3434         struct cifs_open_parms oparms;
3435         __le16 *utf16_path;
3436
3437         cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
3438         if (IS_ERR(tlink))
3439                 return ERR_CAST(tlink);
3440
3441         tcon = tlink_tcon(tlink);
3442         xid = get_xid();
3443
3444         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
3445         if (!utf16_path) {
3446                 rc = -ENOMEM;
3447                 free_xid(xid);
3448                 return ERR_PTR(rc);
3449         }
3450
3451         oparms.tcon = tcon;
3452         oparms.desired_access = READ_CONTROL;
3453         oparms.disposition = FILE_OPEN;
3454         /*
3455          * When querying an ACL, even if the file is a symlink we want to open
3456          * the source not the target, and so the protocol requires that the
3457          * client specify this flag when opening a reparse point
3458          */
3459         oparms.create_options = cifs_create_options(cifs_sb, 0) | OPEN_REPARSE_POINT;
3460         oparms.fid = &fid;
3461         oparms.reconnect = false;
3462
3463         if (info & SACL_SECINFO)
3464                 oparms.desired_access |= SYSTEM_SECURITY;
3465
3466         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
3467                        NULL);
3468         kfree(utf16_path);
3469         if (!rc) {
3470                 rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
3471                                     fid.volatile_fid, (void **)&pntsd, pacllen,
3472                                     info);
3473                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
3474         }
3475
3476         cifs_put_tlink(tlink);
3477         free_xid(xid);
3478
3479         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
3480         if (rc)
3481                 return ERR_PTR(rc);
3482         return pntsd;
3483 }
3484
3485 static int
3486 set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
3487                 struct inode *inode, const char *path, int aclflag)
3488 {
3489         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
3490         unsigned int xid;
3491         int rc, access_flags = 0;
3492         struct cifs_tcon *tcon;
3493         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
3494         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
3495         struct cifs_fid fid;
3496         struct cifs_open_parms oparms;
3497         __le16 *utf16_path;
3498
3499         cifs_dbg(FYI, "set smb3 acl for path %s\n", path);
3500         if (IS_ERR(tlink))
3501                 return PTR_ERR(tlink);
3502
3503         tcon = tlink_tcon(tlink);
3504         xid = get_xid();
3505
3506         if (aclflag & CIFS_ACL_OWNER || aclflag & CIFS_ACL_GROUP)
3507                 access_flags |= WRITE_OWNER;
3508         if (aclflag & CIFS_ACL_SACL)
3509                 access_flags |= SYSTEM_SECURITY;
3510         if (aclflag & CIFS_ACL_DACL)
3511                 access_flags |= WRITE_DAC;
3512
3513         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
3514         if (!utf16_path) {
3515                 rc = -ENOMEM;
3516                 free_xid(xid);
3517                 return rc;
3518         }
3519
3520         oparms.tcon = tcon;
3521         oparms.desired_access = access_flags;
3522         oparms.create_options = cifs_create_options(cifs_sb, 0);
3523         oparms.disposition = FILE_OPEN;
3524         oparms.path = path;
3525         oparms.fid = &fid;
3526         oparms.reconnect = false;
3527
3528         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
3529                        NULL, NULL);
3530         kfree(utf16_path);
3531         if (!rc) {
3532                 rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
3533                             fid.volatile_fid, pnntsd, acllen, aclflag);
3534                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
3535         }
3536
3537         cifs_put_tlink(tlink);
3538         free_xid(xid);
3539         return rc;
3540 }
3541
3542 /* Retrieve an ACL from the server */
3543 static struct cifs_ntsd *
3544 get_smb2_acl(struct cifs_sb_info *cifs_sb,
3545              struct inode *inode, const char *path,
3546              u32 *pacllen, u32 info)
3547 {
3548         struct cifs_ntsd *pntsd = NULL;
3549         struct cifsFileInfo *open_file = NULL;
3550
3551         if (inode && !(info & SACL_SECINFO))
3552                 open_file = find_readable_file(CIFS_I(inode), true);
3553         if (!open_file || (info & SACL_SECINFO))
3554                 return get_smb2_acl_by_path(cifs_sb, path, pacllen, info);
3555
3556         pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen, info);
3557         cifsFileInfo_put(open_file);
3558         return pntsd;
3559 }
3560
3561 static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
3562                             loff_t offset, loff_t len, bool keep_size)
3563 {
3564         struct cifs_ses *ses = tcon->ses;
3565         struct inode *inode;
3566         struct cifsInodeInfo *cifsi;
3567         struct cifsFileInfo *cfile = file->private_data;
3568         struct file_zero_data_information fsctl_buf;
3569         long rc;
3570         unsigned int xid;
3571         __le64 eof;
3572
3573         xid = get_xid();
3574
3575         inode = d_inode(cfile->dentry);
3576         cifsi = CIFS_I(inode);
3577
3578         trace_smb3_zero_enter(xid, cfile->fid.persistent_fid, tcon->tid,
3579                               ses->Suid, offset, len);
3580
3581         /*
3582          * We zero the range through ioctl, so we need remove the page caches
3583          * first, otherwise the data may be inconsistent with the server.
3584          */
3585         truncate_pagecache_range(inode, offset, offset + len - 1);
3586
3587         /* if file not oplocked can't be sure whether asking to extend size */
3588         if (!CIFS_CACHE_READ(cifsi))
3589                 if (keep_size == false) {
3590                         rc = -EOPNOTSUPP;
3591                         trace_smb3_zero_err(xid, cfile->fid.persistent_fid,
3592                                 tcon->tid, ses->Suid, offset, len, rc);
3593                         free_xid(xid);
3594                         return rc;
3595                 }
3596
3597         cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
3598
3599         fsctl_buf.FileOffset = cpu_to_le64(offset);
3600         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
3601
3602         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3603                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA, true,
3604                         (char *)&fsctl_buf,
3605                         sizeof(struct file_zero_data_information),
3606                         0, NULL, NULL);
3607         if (rc)
3608                 goto zero_range_exit;
3609
3610         /*
3611          * do we also need to change the size of the file?
3612          */
3613         if (keep_size == false && i_size_read(inode) < offset + len) {
3614                 eof = cpu_to_le64(offset + len);
3615                 rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
3616                                   cfile->fid.volatile_fid, cfile->pid, &eof);
3617         }
3618
3619  zero_range_exit:
3620         free_xid(xid);
3621         if (rc)
3622                 trace_smb3_zero_err(xid, cfile->fid.persistent_fid, tcon->tid,
3623                               ses->Suid, offset, len, rc);
3624         else
3625                 trace_smb3_zero_done(xid, cfile->fid.persistent_fid, tcon->tid,
3626                               ses->Suid, offset, len);
3627         return rc;
3628 }
3629
3630 static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
3631                             loff_t offset, loff_t len)
3632 {
3633         struct inode *inode;
3634         struct cifsFileInfo *cfile = file->private_data;
3635         struct file_zero_data_information fsctl_buf;
3636         long rc;
3637         unsigned int xid;
3638         __u8 set_sparse = 1;
3639
3640         xid = get_xid();
3641
3642         inode = d_inode(cfile->dentry);
3643
3644         /* Need to make file sparse, if not already, before freeing range. */
3645         /* Consider adding equivalent for compressed since it could also work */
3646         if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse)) {
3647                 rc = -EOPNOTSUPP;
3648                 free_xid(xid);
3649                 return rc;
3650         }
3651
3652         filemap_invalidate_lock(inode->i_mapping);
3653         /*
3654          * We implement the punch hole through ioctl, so we need remove the page
3655          * caches first, otherwise the data may be inconsistent with the server.
3656          */
3657         truncate_pagecache_range(inode, offset, offset + len - 1);
3658
3659         cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
3660
3661         fsctl_buf.FileOffset = cpu_to_le64(offset);
3662         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
3663
3664         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3665                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
3666                         true /* is_fctl */, (char *)&fsctl_buf,
3667                         sizeof(struct file_zero_data_information),
3668                         CIFSMaxBufSize, NULL, NULL);
3669         free_xid(xid);
3670         filemap_invalidate_unlock(inode->i_mapping);
3671         return rc;
3672 }
3673
3674 static int smb3_simple_fallocate_write_range(unsigned int xid,
3675                                              struct cifs_tcon *tcon,
3676                                              struct cifsFileInfo *cfile,
3677                                              loff_t off, loff_t len,
3678                                              char *buf)
3679 {
3680         struct cifs_io_parms io_parms = {0};
3681         int nbytes;
3682         int rc = 0;
3683         struct kvec iov[2];
3684
3685         io_parms.netfid = cfile->fid.netfid;
3686         io_parms.pid = current->tgid;
3687         io_parms.tcon = tcon;
3688         io_parms.persistent_fid = cfile->fid.persistent_fid;
3689         io_parms.volatile_fid = cfile->fid.volatile_fid;
3690
3691         while (len) {
3692                 io_parms.offset = off;
3693                 io_parms.length = len;
3694                 if (io_parms.length > SMB2_MAX_BUFFER_SIZE)
3695                         io_parms.length = SMB2_MAX_BUFFER_SIZE;
3696                 /* iov[0] is reserved for smb header */
3697                 iov[1].iov_base = buf;
3698                 iov[1].iov_len = io_parms.length;
3699                 rc = SMB2_write(xid, &io_parms, &nbytes, iov, 1);
3700                 if (rc)
3701                         break;
3702                 if (nbytes > len)
3703                         return -EINVAL;
3704                 buf += nbytes;
3705                 off += nbytes;
3706                 len -= nbytes;
3707         }
3708         return rc;
3709 }
3710
3711 static int smb3_simple_fallocate_range(unsigned int xid,
3712                                        struct cifs_tcon *tcon,
3713                                        struct cifsFileInfo *cfile,
3714                                        loff_t off, loff_t len)
3715 {
3716         struct file_allocated_range_buffer in_data, *out_data = NULL, *tmp_data;
3717         u32 out_data_len;
3718         char *buf = NULL;
3719         loff_t l;
3720         int rc;
3721
3722         in_data.file_offset = cpu_to_le64(off);
3723         in_data.length = cpu_to_le64(len);
3724         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3725                         cfile->fid.volatile_fid,
3726                         FSCTL_QUERY_ALLOCATED_RANGES, true,
3727                         (char *)&in_data, sizeof(in_data),
3728                         1024 * sizeof(struct file_allocated_range_buffer),
3729                         (char **)&out_data, &out_data_len);
3730         if (rc)
3731                 goto out;
3732
3733         buf = kzalloc(1024 * 1024, GFP_KERNEL);
3734         if (buf == NULL) {
3735                 rc = -ENOMEM;
3736                 goto out;
3737         }
3738
3739         tmp_data = out_data;
3740         while (len) {
3741                 /*
3742                  * The rest of the region is unmapped so write it all.
3743                  */
3744                 if (out_data_len == 0) {
3745                         rc = smb3_simple_fallocate_write_range(xid, tcon,
3746                                                cfile, off, len, buf);
3747                         goto out;
3748                 }
3749
3750                 if (out_data_len < sizeof(struct file_allocated_range_buffer)) {
3751                         rc = -EINVAL;
3752                         goto out;
3753                 }
3754
3755                 if (off < le64_to_cpu(tmp_data->file_offset)) {
3756                         /*
3757                          * We are at a hole. Write until the end of the region
3758                          * or until the next allocated data,
3759                          * whichever comes next.
3760                          */
3761                         l = le64_to_cpu(tmp_data->file_offset) - off;
3762                         if (len < l)
3763                                 l = len;
3764                         rc = smb3_simple_fallocate_write_range(xid, tcon,
3765                                                cfile, off, l, buf);
3766                         if (rc)
3767                                 goto out;
3768                         off = off + l;
3769                         len = len - l;
3770                         if (len == 0)
3771                                 goto out;
3772                 }
3773                 /*
3774                  * We are at a section of allocated data, just skip forward
3775                  * until the end of the data or the end of the region
3776                  * we are supposed to fallocate, whichever comes first.
3777                  */
3778                 l = le64_to_cpu(tmp_data->length);
3779                 if (len < l)
3780                         l = len;
3781                 off += l;
3782                 len -= l;
3783
3784                 tmp_data = &tmp_data[1];
3785                 out_data_len -= sizeof(struct file_allocated_range_buffer);
3786         }
3787
3788  out:
3789         kfree(out_data);
3790         kfree(buf);
3791         return rc;
3792 }
3793
3794
3795 static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
3796                             loff_t off, loff_t len, bool keep_size)
3797 {
3798         struct inode *inode;
3799         struct cifsInodeInfo *cifsi;
3800         struct cifsFileInfo *cfile = file->private_data;
3801         long rc = -EOPNOTSUPP;
3802         unsigned int xid;
3803         __le64 eof;
3804
3805         xid = get_xid();
3806
3807         inode = d_inode(cfile->dentry);
3808         cifsi = CIFS_I(inode);
3809
3810         trace_smb3_falloc_enter(xid, cfile->fid.persistent_fid, tcon->tid,
3811                                 tcon->ses->Suid, off, len);
3812         /* if file not oplocked can't be sure whether asking to extend size */
3813         if (!CIFS_CACHE_READ(cifsi))
3814                 if (keep_size == false) {
3815                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
3816                                 tcon->tid, tcon->ses->Suid, off, len, rc);
3817                         free_xid(xid);
3818                         return rc;
3819                 }
3820
3821         /*
3822          * Extending the file
3823          */
3824         if ((keep_size == false) && i_size_read(inode) < off + len) {
3825                 rc = inode_newsize_ok(inode, off + len);
3826                 if (rc)
3827                         goto out;
3828
3829                 if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0)
3830                         smb2_set_sparse(xid, tcon, cfile, inode, false);
3831
3832                 eof = cpu_to_le64(off + len);
3833                 rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
3834                                   cfile->fid.volatile_fid, cfile->pid, &eof);
3835                 if (rc == 0) {
3836                         cifsi->server_eof = off + len;
3837                         cifs_setsize(inode, off + len);
3838                         cifs_truncate_page(inode->i_mapping, inode->i_size);
3839                         truncate_setsize(inode, off + len);
3840                 }
3841                 goto out;
3842         }
3843
3844         /*
3845          * Files are non-sparse by default so falloc may be a no-op
3846          * Must check if file sparse. If not sparse, and since we are not
3847          * extending then no need to do anything since file already allocated
3848          */
3849         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
3850                 rc = 0;
3851                 goto out;
3852         }
3853
3854         if (keep_size == true) {
3855                 /*
3856                  * We can not preallocate pages beyond the end of the file
3857                  * in SMB2
3858                  */
3859                 if (off >= i_size_read(inode)) {
3860                         rc = 0;
3861                         goto out;
3862                 }
3863                 /*
3864                  * For fallocates that are partially beyond the end of file,
3865                  * clamp len so we only fallocate up to the end of file.
3866                  */
3867                 if (off + len > i_size_read(inode)) {
3868                         len = i_size_read(inode) - off;
3869                 }
3870         }
3871
3872         if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
3873                 /*
3874                  * At this point, we are trying to fallocate an internal
3875                  * regions of a sparse file. Since smb2 does not have a
3876                  * fallocate command we have two otions on how to emulate this.
3877                  * We can either turn the entire file to become non-sparse
3878                  * which we only do if the fallocate is for virtually
3879                  * the whole file,  or we can overwrite the region with zeroes
3880                  * using SMB2_write, which could be prohibitevly expensive
3881                  * if len is large.
3882                  */
3883                 /*
3884                  * We are only trying to fallocate a small region so
3885                  * just write it with zero.
3886                  */
3887                 if (len <= 1024 * 1024) {
3888                         rc = smb3_simple_fallocate_range(xid, tcon, cfile,
3889                                                          off, len);
3890                         goto out;
3891                 }
3892
3893                 /*
3894                  * Check if falloc starts within first few pages of file
3895                  * and ends within a few pages of the end of file to
3896                  * ensure that most of file is being forced to be
3897                  * fallocated now. If so then setting whole file sparse
3898                  * ie potentially making a few extra pages at the beginning
3899                  * or end of the file non-sparse via set_sparse is harmless.
3900                  */
3901                 if ((off > 8192) || (off + len + 8192 < i_size_read(inode))) {
3902                         rc = -EOPNOTSUPP;
3903                         goto out;
3904                 }
3905         }
3906
3907         smb2_set_sparse(xid, tcon, cfile, inode, false);
3908         rc = 0;
3909
3910 out:
3911         if (rc)
3912                 trace_smb3_falloc_err(xid, cfile->fid.persistent_fid, tcon->tid,
3913                                 tcon->ses->Suid, off, len, rc);
3914         else
3915                 trace_smb3_falloc_done(xid, cfile->fid.persistent_fid, tcon->tid,
3916                                 tcon->ses->Suid, off, len);
3917
3918         free_xid(xid);
3919         return rc;
3920 }
3921
3922 static long smb3_collapse_range(struct file *file, struct cifs_tcon *tcon,
3923                             loff_t off, loff_t len)
3924 {
3925         int rc;
3926         unsigned int xid;
3927         struct inode *inode;
3928         struct cifsFileInfo *cfile = file->private_data;
3929         struct cifsInodeInfo *cifsi;
3930         __le64 eof;
3931
3932         xid = get_xid();
3933
3934         inode = d_inode(cfile->dentry);
3935         cifsi = CIFS_I(inode);
3936
3937         if (off >= i_size_read(inode) ||
3938             off + len >= i_size_read(inode)) {
3939                 rc = -EINVAL;
3940                 goto out;
3941         }
3942
3943         rc = smb2_copychunk_range(xid, cfile, cfile, off + len,
3944                                   i_size_read(inode) - off - len, off);
3945         if (rc < 0)
3946                 goto out;
3947
3948         eof = cpu_to_le64(i_size_read(inode) - len);
3949         rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
3950                           cfile->fid.volatile_fid, cfile->pid, &eof);
3951         if (rc < 0)
3952                 goto out;
3953
3954         rc = 0;
3955
3956         cifsi->server_eof = i_size_read(inode) - len;
3957         truncate_setsize(inode, cifsi->server_eof);
3958         fscache_resize_cookie(cifs_inode_cookie(inode), cifsi->server_eof);
3959  out:
3960         free_xid(xid);
3961         return rc;
3962 }
3963
3964 static long smb3_insert_range(struct file *file, struct cifs_tcon *tcon,
3965                               loff_t off, loff_t len)
3966 {
3967         int rc;
3968         unsigned int xid;
3969         struct cifsFileInfo *cfile = file->private_data;
3970         __le64 eof;
3971         __u64  count;
3972
3973         xid = get_xid();
3974
3975         if (off >= i_size_read(file->f_inode)) {
3976                 rc = -EINVAL;
3977                 goto out;
3978         }
3979
3980         count = i_size_read(file->f_inode) - off;
3981         eof = cpu_to_le64(i_size_read(file->f_inode) + len);
3982
3983         rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
3984                           cfile->fid.volatile_fid, cfile->pid, &eof);
3985         if (rc < 0)
3986                 goto out;
3987
3988         rc = smb2_copychunk_range(xid, cfile, cfile, off, count, off + len);
3989         if (rc < 0)
3990                 goto out;
3991
3992         rc = smb3_zero_range(file, tcon, off, len, 1);
3993         if (rc < 0)
3994                 goto out;
3995
3996         rc = 0;
3997  out:
3998         free_xid(xid);
3999         return rc;
4000 }
4001
4002 static loff_t smb3_llseek(struct file *file, struct cifs_tcon *tcon, loff_t offset, int whence)
4003 {
4004         struct cifsFileInfo *wrcfile, *cfile = file->private_data;
4005         struct cifsInodeInfo *cifsi;
4006         struct inode *inode;
4007         int rc = 0;
4008         struct file_allocated_range_buffer in_data, *out_data = NULL;
4009         u32 out_data_len;
4010         unsigned int xid;
4011
4012         if (whence != SEEK_HOLE && whence != SEEK_DATA)
4013                 return generic_file_llseek(file, offset, whence);
4014
4015         inode = d_inode(cfile->dentry);
4016         cifsi = CIFS_I(inode);
4017
4018         if (offset < 0 || offset >= i_size_read(inode))
4019                 return -ENXIO;
4020
4021         xid = get_xid();
4022         /*
4023          * We need to be sure that all dirty pages are written as they
4024          * might fill holes on the server.
4025          * Note that we also MUST flush any written pages since at least
4026          * some servers (Windows2016) will not reflect recent writes in
4027          * QUERY_ALLOCATED_RANGES until SMB2_flush is called.
4028          */
4029         wrcfile = find_writable_file(cifsi, FIND_WR_ANY);
4030         if (wrcfile) {
4031                 filemap_write_and_wait(inode->i_mapping);
4032                 smb2_flush_file(xid, tcon, &wrcfile->fid);
4033                 cifsFileInfo_put(wrcfile);
4034         }
4035
4036         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE)) {
4037                 if (whence == SEEK_HOLE)
4038                         offset = i_size_read(inode);
4039                 goto lseek_exit;
4040         }
4041
4042         in_data.file_offset = cpu_to_le64(offset);
4043         in_data.length = cpu_to_le64(i_size_read(inode));
4044
4045         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
4046                         cfile->fid.volatile_fid,
4047                         FSCTL_QUERY_ALLOCATED_RANGES, true,
4048                         (char *)&in_data, sizeof(in_data),
4049                         sizeof(struct file_allocated_range_buffer),
4050                         (char **)&out_data, &out_data_len);
4051         if (rc == -E2BIG)
4052                 rc = 0;
4053         if (rc)
4054                 goto lseek_exit;
4055
4056         if (whence == SEEK_HOLE && out_data_len == 0)
4057                 goto lseek_exit;
4058
4059         if (whence == SEEK_DATA && out_data_len == 0) {
4060                 rc = -ENXIO;
4061                 goto lseek_exit;
4062         }
4063
4064         if (out_data_len < sizeof(struct file_allocated_range_buffer)) {
4065                 rc = -EINVAL;
4066                 goto lseek_exit;
4067         }
4068         if (whence == SEEK_DATA) {
4069                 offset = le64_to_cpu(out_data->file_offset);
4070                 goto lseek_exit;
4071         }
4072         if (offset < le64_to_cpu(out_data->file_offset))
4073                 goto lseek_exit;
4074
4075         offset = le64_to_cpu(out_data->file_offset) + le64_to_cpu(out_data->length);
4076
4077  lseek_exit:
4078         free_xid(xid);
4079         kfree(out_data);
4080         if (!rc)
4081                 return vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
4082         else
4083                 return rc;
4084 }
4085
4086 static int smb3_fiemap(struct cifs_tcon *tcon,
4087                        struct cifsFileInfo *cfile,
4088                        struct fiemap_extent_info *fei, u64 start, u64 len)
4089 {
4090         unsigned int xid;
4091         struct file_allocated_range_buffer in_data, *out_data;
4092         u32 out_data_len;
4093         int i, num, rc, flags, last_blob;
4094         u64 next;
4095
4096         rc = fiemap_prep(d_inode(cfile->dentry), fei, start, &len, 0);
4097         if (rc)
4098                 return rc;
4099
4100         xid = get_xid();
4101  again:
4102         in_data.file_offset = cpu_to_le64(start);
4103         in_data.length = cpu_to_le64(len);
4104
4105         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
4106                         cfile->fid.volatile_fid,
4107                         FSCTL_QUERY_ALLOCATED_RANGES, true,
4108                         (char *)&in_data, sizeof(in_data),
4109                         1024 * sizeof(struct file_allocated_range_buffer),
4110                         (char **)&out_data, &out_data_len);
4111         if (rc == -E2BIG) {
4112                 last_blob = 0;
4113                 rc = 0;
4114         } else
4115                 last_blob = 1;
4116         if (rc)
4117                 goto out;
4118
4119         if (out_data_len && out_data_len < sizeof(struct file_allocated_range_buffer)) {
4120                 rc = -EINVAL;
4121                 goto out;
4122         }
4123         if (out_data_len % sizeof(struct file_allocated_range_buffer)) {
4124                 rc = -EINVAL;
4125                 goto out;
4126         }
4127
4128         num = out_data_len / sizeof(struct file_allocated_range_buffer);
4129         for (i = 0; i < num; i++) {
4130                 flags = 0;
4131                 if (i == num - 1 && last_blob)
4132                         flags |= FIEMAP_EXTENT_LAST;
4133
4134                 rc = fiemap_fill_next_extent(fei,
4135                                 le64_to_cpu(out_data[i].file_offset),
4136                                 le64_to_cpu(out_data[i].file_offset),
4137                                 le64_to_cpu(out_data[i].length),
4138                                 flags);
4139                 if (rc < 0)
4140                         goto out;
4141                 if (rc == 1) {
4142                         rc = 0;
4143                         goto out;
4144                 }
4145         }
4146
4147         if (!last_blob) {
4148                 next = le64_to_cpu(out_data[num - 1].file_offset) +
4149                   le64_to_cpu(out_data[num - 1].length);
4150                 len = len - (next - start);
4151                 start = next;
4152                 goto again;
4153         }
4154
4155  out:
4156         free_xid(xid);
4157         kfree(out_data);
4158         return rc;
4159 }
4160
4161 static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
4162                            loff_t off, loff_t len)
4163 {
4164         /* KEEP_SIZE already checked for by do_fallocate */
4165         if (mode & FALLOC_FL_PUNCH_HOLE)
4166                 return smb3_punch_hole(file, tcon, off, len);
4167         else if (mode & FALLOC_FL_ZERO_RANGE) {
4168                 if (mode & FALLOC_FL_KEEP_SIZE)
4169                         return smb3_zero_range(file, tcon, off, len, true);
4170                 return smb3_zero_range(file, tcon, off, len, false);
4171         } else if (mode == FALLOC_FL_KEEP_SIZE)
4172                 return smb3_simple_falloc(file, tcon, off, len, true);
4173         else if (mode == FALLOC_FL_COLLAPSE_RANGE)
4174                 return smb3_collapse_range(file, tcon, off, len);
4175         else if (mode == FALLOC_FL_INSERT_RANGE)
4176                 return smb3_insert_range(file, tcon, off, len);
4177         else if (mode == 0)
4178                 return smb3_simple_falloc(file, tcon, off, len, false);
4179
4180         return -EOPNOTSUPP;
4181 }
4182
4183 static void
4184 smb2_downgrade_oplock(struct TCP_Server_Info *server,
4185                       struct cifsInodeInfo *cinode, __u32 oplock,
4186                       unsigned int epoch, bool *purge_cache)
4187 {
4188         server->ops->set_oplock_level(cinode, oplock, 0, NULL);
4189 }
4190
4191 static void
4192 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
4193                        unsigned int epoch, bool *purge_cache);
4194
4195 static void
4196 smb3_downgrade_oplock(struct TCP_Server_Info *server,
4197                        struct cifsInodeInfo *cinode, __u32 oplock,
4198                        unsigned int epoch, bool *purge_cache)
4199 {
4200         unsigned int old_state = cinode->oplock;
4201         unsigned int old_epoch = cinode->epoch;
4202         unsigned int new_state;
4203
4204         if (epoch > old_epoch) {
4205                 smb21_set_oplock_level(cinode, oplock, 0, NULL);
4206                 cinode->epoch = epoch;
4207         }
4208
4209         new_state = cinode->oplock;
4210         *purge_cache = false;
4211
4212         if ((old_state & CIFS_CACHE_READ_FLG) != 0 &&
4213             (new_state & CIFS_CACHE_READ_FLG) == 0)
4214                 *purge_cache = true;
4215         else if (old_state == new_state && (epoch - old_epoch > 1))
4216                 *purge_cache = true;
4217 }
4218
4219 static void
4220 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
4221                       unsigned int epoch, bool *purge_cache)
4222 {
4223         oplock &= 0xFF;
4224         cinode->lease_granted = false;
4225         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
4226                 return;
4227         if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
4228                 cinode->oplock = CIFS_CACHE_RHW_FLG;
4229                 cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
4230                          &cinode->vfs_inode);
4231         } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
4232                 cinode->oplock = CIFS_CACHE_RW_FLG;
4233                 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
4234                          &cinode->vfs_inode);
4235         } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
4236                 cinode->oplock = CIFS_CACHE_READ_FLG;
4237                 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
4238                          &cinode->vfs_inode);
4239         } else
4240                 cinode->oplock = 0;
4241 }
4242
4243 static void
4244 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
4245                        unsigned int epoch, bool *purge_cache)
4246 {
4247         char message[5] = {0};
4248         unsigned int new_oplock = 0;
4249
4250         oplock &= 0xFF;
4251         cinode->lease_granted = true;
4252         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
4253                 return;
4254
4255         /* Check if the server granted an oplock rather than a lease */
4256         if (oplock & SMB2_OPLOCK_LEVEL_EXCLUSIVE)
4257                 return smb2_set_oplock_level(cinode, oplock, epoch,
4258                                              purge_cache);
4259
4260         if (oplock & SMB2_LEASE_READ_CACHING_HE) {
4261                 new_oplock |= CIFS_CACHE_READ_FLG;
4262                 strcat(message, "R");
4263         }
4264         if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
4265                 new_oplock |= CIFS_CACHE_HANDLE_FLG;
4266                 strcat(message, "H");
4267         }
4268         if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
4269                 new_oplock |= CIFS_CACHE_WRITE_FLG;
4270                 strcat(message, "W");
4271         }
4272         if (!new_oplock)
4273                 strncpy(message, "None", sizeof(message));
4274
4275         cinode->oplock = new_oplock;
4276         cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
4277                  &cinode->vfs_inode);
4278 }
4279
4280 static void
4281 smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
4282                       unsigned int epoch, bool *purge_cache)
4283 {
4284         unsigned int old_oplock = cinode->oplock;
4285
4286         smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
4287
4288         if (purge_cache) {
4289                 *purge_cache = false;
4290                 if (old_oplock == CIFS_CACHE_READ_FLG) {
4291                         if (cinode->oplock == CIFS_CACHE_READ_FLG &&
4292                             (epoch - cinode->epoch > 0))
4293                                 *purge_cache = true;
4294                         else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
4295                                  (epoch - cinode->epoch > 1))
4296                                 *purge_cache = true;
4297                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
4298                                  (epoch - cinode->epoch > 1))
4299                                 *purge_cache = true;
4300                         else if (cinode->oplock == 0 &&
4301                                  (epoch - cinode->epoch > 0))
4302                                 *purge_cache = true;
4303                 } else if (old_oplock == CIFS_CACHE_RH_FLG) {
4304                         if (cinode->oplock == CIFS_CACHE_RH_FLG &&
4305                             (epoch - cinode->epoch > 0))
4306                                 *purge_cache = true;
4307                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
4308                                  (epoch - cinode->epoch > 1))
4309                                 *purge_cache = true;
4310                 }
4311                 cinode->epoch = epoch;
4312         }
4313 }
4314
4315 static bool
4316 smb2_is_read_op(__u32 oplock)
4317 {
4318         return oplock == SMB2_OPLOCK_LEVEL_II;
4319 }
4320
4321 static bool
4322 smb21_is_read_op(__u32 oplock)
4323 {
4324         return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
4325                !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
4326 }
4327
4328 static __le32
4329 map_oplock_to_lease(u8 oplock)
4330 {
4331         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
4332                 return SMB2_LEASE_WRITE_CACHING_LE | SMB2_LEASE_READ_CACHING_LE;
4333         else if (oplock == SMB2_OPLOCK_LEVEL_II)
4334                 return SMB2_LEASE_READ_CACHING_LE;
4335         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
4336                 return SMB2_LEASE_HANDLE_CACHING_LE | SMB2_LEASE_READ_CACHING_LE |
4337                        SMB2_LEASE_WRITE_CACHING_LE;
4338         return 0;
4339 }
4340
4341 static char *
4342 smb2_create_lease_buf(u8 *lease_key, u8 oplock)
4343 {
4344         struct create_lease *buf;
4345
4346         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
4347         if (!buf)
4348                 return NULL;
4349
4350         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
4351         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
4352
4353         buf->ccontext.DataOffset = cpu_to_le16(offsetof
4354                                         (struct create_lease, lcontext));
4355         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
4356         buf->ccontext.NameOffset = cpu_to_le16(offsetof
4357                                 (struct create_lease, Name));
4358         buf->ccontext.NameLength = cpu_to_le16(4);
4359         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
4360         buf->Name[0] = 'R';
4361         buf->Name[1] = 'q';
4362         buf->Name[2] = 'L';
4363         buf->Name[3] = 's';
4364         return (char *)buf;
4365 }
4366
4367 static char *
4368 smb3_create_lease_buf(u8 *lease_key, u8 oplock)
4369 {
4370         struct create_lease_v2 *buf;
4371
4372         buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
4373         if (!buf)
4374                 return NULL;
4375
4376         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
4377         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
4378
4379         buf->ccontext.DataOffset = cpu_to_le16(offsetof
4380                                         (struct create_lease_v2, lcontext));
4381         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
4382         buf->ccontext.NameOffset = cpu_to_le16(offsetof
4383                                 (struct create_lease_v2, Name));
4384         buf->ccontext.NameLength = cpu_to_le16(4);
4385         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
4386         buf->Name[0] = 'R';
4387         buf->Name[1] = 'q';
4388         buf->Name[2] = 'L';
4389         buf->Name[3] = 's';
4390         return (char *)buf;
4391 }
4392
4393 static __u8
4394 smb2_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
4395 {
4396         struct create_lease *lc = (struct create_lease *)buf;
4397
4398         *epoch = 0; /* not used */
4399         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE)
4400                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
4401         return le32_to_cpu(lc->lcontext.LeaseState);
4402 }
4403
4404 static __u8
4405 smb3_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
4406 {
4407         struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
4408
4409         *epoch = le16_to_cpu(lc->lcontext.Epoch);
4410         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS_LE)
4411                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
4412         if (lease_key)
4413                 memcpy(lease_key, &lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
4414         return le32_to_cpu(lc->lcontext.LeaseState);
4415 }
4416
4417 static unsigned int
4418 smb2_wp_retry_size(struct inode *inode)
4419 {
4420         return min_t(unsigned int, CIFS_SB(inode->i_sb)->ctx->wsize,
4421                      SMB2_MAX_BUFFER_SIZE);
4422 }
4423
4424 static bool
4425 smb2_dir_needs_close(struct cifsFileInfo *cfile)
4426 {
4427         return !cfile->invalidHandle;
4428 }
4429
4430 static void
4431 fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, unsigned int orig_len,
4432                    struct smb_rqst *old_rq, __le16 cipher_type)
4433 {
4434         struct smb2_hdr *shdr =
4435                         (struct smb2_hdr *)old_rq->rq_iov[0].iov_base;
4436
4437         memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
4438         tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
4439         tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
4440         tr_hdr->Flags = cpu_to_le16(0x01);
4441         if ((cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
4442             (cipher_type == SMB2_ENCRYPTION_AES256_GCM))
4443                 get_random_bytes(&tr_hdr->Nonce, SMB3_AES_GCM_NONCE);
4444         else
4445                 get_random_bytes(&tr_hdr->Nonce, SMB3_AES_CCM_NONCE);
4446         memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
4447 }
4448
4449 /* We can not use the normal sg_set_buf() as we will sometimes pass a
4450  * stack object as buf.
4451  */
4452 static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf,
4453                                    unsigned int buflen)
4454 {
4455         void *addr;
4456         /*
4457          * VMAP_STACK (at least) puts stack into the vmalloc address space
4458          */
4459         if (is_vmalloc_addr(buf))
4460                 addr = vmalloc_to_page(buf);
4461         else
4462                 addr = virt_to_page(buf);
4463         sg_set_page(sg, addr, buflen, offset_in_page(buf));
4464 }
4465
4466 /* Assumes the first rqst has a transform header as the first iov.
4467  * I.e.
4468  * rqst[0].rq_iov[0]  is transform header
4469  * rqst[0].rq_iov[1+] data to be encrypted/decrypted
4470  * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
4471  */
4472 static struct scatterlist *
4473 init_sg(int num_rqst, struct smb_rqst *rqst, u8 *sign)
4474 {
4475         unsigned int sg_len;
4476         struct scatterlist *sg;
4477         unsigned int i;
4478         unsigned int j;
4479         unsigned int idx = 0;
4480         int skip;
4481
4482         sg_len = 1;
4483         for (i = 0; i < num_rqst; i++)
4484                 sg_len += rqst[i].rq_nvec + rqst[i].rq_npages;
4485
4486         sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
4487         if (!sg)
4488                 return NULL;
4489
4490         sg_init_table(sg, sg_len);
4491         for (i = 0; i < num_rqst; i++) {
4492                 for (j = 0; j < rqst[i].rq_nvec; j++) {
4493                         /*
4494                          * The first rqst has a transform header where the
4495                          * first 20 bytes are not part of the encrypted blob
4496                          */
4497                         skip = (i == 0) && (j == 0) ? 20 : 0;
4498                         smb2_sg_set_buf(&sg[idx++],
4499                                         rqst[i].rq_iov[j].iov_base + skip,
4500                                         rqst[i].rq_iov[j].iov_len - skip);
4501                         }
4502
4503                 for (j = 0; j < rqst[i].rq_npages; j++) {
4504                         unsigned int len, offset;
4505
4506                         rqst_page_get_length(&rqst[i], j, &len, &offset);
4507                         sg_set_page(&sg[idx++], rqst[i].rq_pages[j], len, offset);
4508                 }
4509         }
4510         smb2_sg_set_buf(&sg[idx], sign, SMB2_SIGNATURE_SIZE);
4511         return sg;
4512 }
4513
4514 static int
4515 smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
4516 {
4517         struct cifs_ses *ses;
4518         u8 *ses_enc_key;
4519
4520         spin_lock(&cifs_tcp_ses_lock);
4521         list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
4522                 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
4523                         if (ses->Suid == ses_id) {
4524                                 ses_enc_key = enc ? ses->smb3encryptionkey :
4525                                         ses->smb3decryptionkey;
4526                                 memcpy(key, ses_enc_key, SMB3_ENC_DEC_KEY_SIZE);
4527                                 spin_unlock(&cifs_tcp_ses_lock);
4528                                 return 0;
4529                         }
4530                 }
4531         }
4532         spin_unlock(&cifs_tcp_ses_lock);
4533
4534         return -EAGAIN;
4535 }
4536 /*
4537  * Encrypt or decrypt @rqst message. @rqst[0] has the following format:
4538  * iov[0]   - transform header (associate data),
4539  * iov[1-N] - SMB2 header and pages - data to encrypt.
4540  * On success return encrypted data in iov[1-N] and pages, leave iov[0]
4541  * untouched.
4542  */
4543 static int
4544 crypt_message(struct TCP_Server_Info *server, int num_rqst,
4545               struct smb_rqst *rqst, int enc)
4546 {
4547         struct smb2_transform_hdr *tr_hdr =
4548                 (struct smb2_transform_hdr *)rqst[0].rq_iov[0].iov_base;
4549         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
4550         int rc = 0;
4551         struct scatterlist *sg;
4552         u8 sign[SMB2_SIGNATURE_SIZE] = {};
4553         u8 key[SMB3_ENC_DEC_KEY_SIZE];
4554         struct aead_request *req;
4555         char *iv;
4556         unsigned int iv_len;
4557         DECLARE_CRYPTO_WAIT(wait);
4558         struct crypto_aead *tfm;
4559         unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
4560
4561         rc = smb2_get_enc_key(server, le64_to_cpu(tr_hdr->SessionId), enc, key);
4562         if (rc) {
4563                 cifs_server_dbg(VFS, "%s: Could not get %scryption key\n", __func__,
4564                          enc ? "en" : "de");
4565                 return rc;
4566         }
4567
4568         rc = smb3_crypto_aead_allocate(server);
4569         if (rc) {
4570                 cifs_server_dbg(VFS, "%s: crypto alloc failed\n", __func__);
4571                 return rc;
4572         }
4573
4574         tfm = enc ? server->secmech.ccmaesencrypt :
4575                                                 server->secmech.ccmaesdecrypt;
4576
4577         if ((server->cipher_type == SMB2_ENCRYPTION_AES256_CCM) ||
4578                 (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
4579                 rc = crypto_aead_setkey(tfm, key, SMB3_GCM256_CRYPTKEY_SIZE);
4580         else
4581                 rc = crypto_aead_setkey(tfm, key, SMB3_GCM128_CRYPTKEY_SIZE);
4582
4583         if (rc) {
4584                 cifs_server_dbg(VFS, "%s: Failed to set aead key %d\n", __func__, rc);
4585                 return rc;
4586         }
4587
4588         rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
4589         if (rc) {
4590                 cifs_server_dbg(VFS, "%s: Failed to set authsize %d\n", __func__, rc);
4591                 return rc;
4592         }
4593
4594         req = aead_request_alloc(tfm, GFP_KERNEL);
4595         if (!req) {
4596                 cifs_server_dbg(VFS, "%s: Failed to alloc aead request\n", __func__);
4597                 return -ENOMEM;
4598         }
4599
4600         if (!enc) {
4601                 memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
4602                 crypt_len += SMB2_SIGNATURE_SIZE;
4603         }
4604
4605         sg = init_sg(num_rqst, rqst, sign);
4606         if (!sg) {
4607                 cifs_server_dbg(VFS, "%s: Failed to init sg\n", __func__);
4608                 rc = -ENOMEM;
4609                 goto free_req;
4610         }
4611
4612         iv_len = crypto_aead_ivsize(tfm);
4613         iv = kzalloc(iv_len, GFP_KERNEL);
4614         if (!iv) {
4615                 cifs_server_dbg(VFS, "%s: Failed to alloc iv\n", __func__);
4616                 rc = -ENOMEM;
4617                 goto free_sg;
4618         }
4619
4620         if ((server->cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
4621             (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
4622                 memcpy(iv, (char *)tr_hdr->Nonce, SMB3_AES_GCM_NONCE);
4623         else {
4624                 iv[0] = 3;
4625                 memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES_CCM_NONCE);
4626         }
4627
4628         aead_request_set_crypt(req, sg, sg, crypt_len, iv);
4629         aead_request_set_ad(req, assoc_data_len);
4630
4631         aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
4632                                   crypto_req_done, &wait);
4633
4634         rc = crypto_wait_req(enc ? crypto_aead_encrypt(req)
4635                                 : crypto_aead_decrypt(req), &wait);
4636
4637         if (!rc && enc)
4638                 memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
4639
4640         kfree(iv);
4641 free_sg:
4642         kfree(sg);
4643 free_req:
4644         kfree(req);
4645         return rc;
4646 }
4647
4648 void
4649 smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst)
4650 {
4651         int i, j;
4652
4653         for (i = 0; i < num_rqst; i++) {
4654                 if (rqst[i].rq_pages) {
4655                         for (j = rqst[i].rq_npages - 1; j >= 0; j--)
4656                                 put_page(rqst[i].rq_pages[j]);
4657                         kfree(rqst[i].rq_pages);
4658                 }
4659         }
4660 }
4661
4662 /*
4663  * This function will initialize new_rq and encrypt the content.
4664  * The first entry, new_rq[0], only contains a single iov which contains
4665  * a smb2_transform_hdr and is pre-allocated by the caller.
4666  * This function then populates new_rq[1+] with the content from olq_rq[0+].
4667  *
4668  * The end result is an array of smb_rqst structures where the first structure
4669  * only contains a single iov for the transform header which we then can pass
4670  * to crypt_message().
4671  *
4672  * new_rq[0].rq_iov[0] :  smb2_transform_hdr pre-allocated by the caller
4673  * new_rq[1+].rq_iov[*] == old_rq[0+].rq_iov[*] : SMB2/3 requests
4674  */
4675 static int
4676 smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
4677                        struct smb_rqst *new_rq, struct smb_rqst *old_rq)
4678 {
4679         struct page **pages;
4680         struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
4681         unsigned int npages;
4682         unsigned int orig_len = 0;
4683         int i, j;
4684         int rc = -ENOMEM;
4685
4686         for (i = 1; i < num_rqst; i++) {
4687                 npages = old_rq[i - 1].rq_npages;
4688                 pages = kmalloc_array(npages, sizeof(struct page *),
4689                                       GFP_KERNEL);
4690                 if (!pages)
4691                         goto err_free;
4692
4693                 new_rq[i].rq_pages = pages;
4694                 new_rq[i].rq_npages = npages;
4695                 new_rq[i].rq_offset = old_rq[i - 1].rq_offset;
4696                 new_rq[i].rq_pagesz = old_rq[i - 1].rq_pagesz;
4697                 new_rq[i].rq_tailsz = old_rq[i - 1].rq_tailsz;
4698                 new_rq[i].rq_iov = old_rq[i - 1].rq_iov;
4699                 new_rq[i].rq_nvec = old_rq[i - 1].rq_nvec;
4700
4701                 orig_len += smb_rqst_len(server, &old_rq[i - 1]);
4702
4703                 for (j = 0; j < npages; j++) {
4704                         pages[j] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
4705                         if (!pages[j])
4706                                 goto err_free;
4707                 }
4708
4709                 /* copy pages form the old */
4710                 for (j = 0; j < npages; j++) {
4711                         char *dst, *src;
4712                         unsigned int offset, len;
4713
4714                         rqst_page_get_length(&new_rq[i], j, &len, &offset);
4715
4716                         dst = (char *) kmap(new_rq[i].rq_pages[j]) + offset;
4717                         src = (char *) kmap(old_rq[i - 1].rq_pages[j]) + offset;
4718
4719                         memcpy(dst, src, len);
4720                         kunmap(new_rq[i].rq_pages[j]);
4721                         kunmap(old_rq[i - 1].rq_pages[j]);
4722                 }
4723         }
4724
4725         /* fill the 1st iov with a transform header */
4726         fill_transform_hdr(tr_hdr, orig_len, old_rq, server->cipher_type);
4727
4728         rc = crypt_message(server, num_rqst, new_rq, 1);
4729         cifs_dbg(FYI, "Encrypt message returned %d\n", rc);
4730         if (rc)
4731                 goto err_free;
4732
4733         return rc;
4734
4735 err_free:
4736         smb3_free_compound_rqst(num_rqst - 1, &new_rq[1]);
4737         return rc;
4738 }
4739
4740 static int
4741 smb3_is_transform_hdr(void *buf)
4742 {
4743         struct smb2_transform_hdr *trhdr = buf;
4744
4745         return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
4746 }
4747
4748 static int
4749 decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
4750                  unsigned int buf_data_size, struct page **pages,
4751                  unsigned int npages, unsigned int page_data_size,
4752                  bool is_offloaded)
4753 {
4754         struct kvec iov[2];
4755         struct smb_rqst rqst = {NULL};
4756         int rc;
4757
4758         iov[0].iov_base = buf;
4759         iov[0].iov_len = sizeof(struct smb2_transform_hdr);
4760         iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
4761         iov[1].iov_len = buf_data_size;
4762
4763         rqst.rq_iov = iov;
4764         rqst.rq_nvec = 2;
4765         rqst.rq_pages = pages;
4766         rqst.rq_npages = npages;
4767         rqst.rq_pagesz = PAGE_SIZE;
4768         rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
4769
4770         rc = crypt_message(server, 1, &rqst, 0);
4771         cifs_dbg(FYI, "Decrypt message returned %d\n", rc);
4772
4773         if (rc)
4774                 return rc;
4775
4776         memmove(buf, iov[1].iov_base, buf_data_size);
4777
4778         if (!is_offloaded)
4779                 server->total_read = buf_data_size + page_data_size;
4780
4781         return rc;
4782 }
4783
4784 static int
4785 read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
4786                      unsigned int npages, unsigned int len)
4787 {
4788         int i;
4789         int length;
4790
4791         for (i = 0; i < npages; i++) {
4792                 struct page *page = pages[i];
4793                 size_t n;
4794
4795                 n = len;
4796                 if (len >= PAGE_SIZE) {
4797                         /* enough data to fill the page */
4798                         n = PAGE_SIZE;
4799                         len -= n;
4800                 } else {
4801                         zero_user(page, len, PAGE_SIZE - len);
4802                         len = 0;
4803                 }
4804                 length = cifs_read_page_from_socket(server, page, 0, n);
4805                 if (length < 0)
4806                         return length;
4807                 server->total_read += length;
4808         }
4809
4810         return 0;
4811 }
4812
4813 static int
4814 init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
4815                unsigned int cur_off, struct bio_vec **page_vec)
4816 {
4817         struct bio_vec *bvec;
4818         int i;
4819
4820         bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
4821         if (!bvec)
4822                 return -ENOMEM;
4823
4824         for (i = 0; i < npages; i++) {
4825                 bvec[i].bv_page = pages[i];
4826                 bvec[i].bv_offset = (i == 0) ? cur_off : 0;
4827                 bvec[i].bv_len = min_t(unsigned int, PAGE_SIZE, data_size);
4828                 data_size -= bvec[i].bv_len;
4829         }
4830
4831         if (data_size != 0) {
4832                 cifs_dbg(VFS, "%s: something went wrong\n", __func__);
4833                 kfree(bvec);
4834                 return -EIO;
4835         }
4836
4837         *page_vec = bvec;
4838         return 0;
4839 }
4840
4841 static int
4842 handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
4843                  char *buf, unsigned int buf_len, struct page **pages,
4844                  unsigned int npages, unsigned int page_data_size,
4845                  bool is_offloaded)
4846 {
4847         unsigned int data_offset;
4848         unsigned int data_len;
4849         unsigned int cur_off;
4850         unsigned int cur_page_idx;
4851         unsigned int pad_len;
4852         struct cifs_readdata *rdata = mid->callback_data;
4853         struct smb2_hdr *shdr = (struct smb2_hdr *)buf;
4854         struct bio_vec *bvec = NULL;
4855         struct iov_iter iter;
4856         struct kvec iov;
4857         int length;
4858         bool use_rdma_mr = false;
4859
4860         if (shdr->Command != SMB2_READ) {
4861                 cifs_server_dbg(VFS, "only big read responses are supported\n");
4862                 return -ENOTSUPP;
4863         }
4864
4865         if (server->ops->is_session_expired &&
4866             server->ops->is_session_expired(buf)) {
4867                 if (!is_offloaded)
4868                         cifs_reconnect(server, true);
4869                 return -1;
4870         }
4871
4872         if (server->ops->is_status_pending &&
4873                         server->ops->is_status_pending(buf, server))
4874                 return -1;
4875
4876         /* set up first two iov to get credits */
4877         rdata->iov[0].iov_base = buf;
4878         rdata->iov[0].iov_len = 0;
4879         rdata->iov[1].iov_base = buf;
4880         rdata->iov[1].iov_len =
4881                 min_t(unsigned int, buf_len, server->vals->read_rsp_size);
4882         cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
4883                  rdata->iov[0].iov_base, rdata->iov[0].iov_len);
4884         cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
4885                  rdata->iov[1].iov_base, rdata->iov[1].iov_len);
4886
4887         rdata->result = server->ops->map_error(buf, true);
4888         if (rdata->result != 0) {
4889                 cifs_dbg(FYI, "%s: server returned error %d\n",
4890                          __func__, rdata->result);
4891                 /* normal error on read response */
4892                 if (is_offloaded)
4893                         mid->mid_state = MID_RESPONSE_RECEIVED;
4894                 else
4895                         dequeue_mid(mid, false);
4896                 return 0;
4897         }
4898
4899         data_offset = server->ops->read_data_offset(buf);
4900 #ifdef CONFIG_CIFS_SMB_DIRECT
4901         use_rdma_mr = rdata->mr;
4902 #endif
4903         data_len = server->ops->read_data_length(buf, use_rdma_mr);
4904
4905         if (data_offset < server->vals->read_rsp_size) {
4906                 /*
4907                  * win2k8 sometimes sends an offset of 0 when the read
4908                  * is beyond the EOF. Treat it as if the data starts just after
4909                  * the header.
4910                  */
4911                 cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
4912                          __func__, data_offset);
4913                 data_offset = server->vals->read_rsp_size;
4914         } else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
4915                 /* data_offset is beyond the end of smallbuf */
4916                 cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
4917                          __func__, data_offset);
4918                 rdata->result = -EIO;
4919                 if (is_offloaded)
4920                         mid->mid_state = MID_RESPONSE_MALFORMED;
4921                 else
4922                         dequeue_mid(mid, rdata->result);
4923                 return 0;
4924         }
4925
4926         pad_len = data_offset - server->vals->read_rsp_size;
4927
4928         if (buf_len <= data_offset) {
4929                 /* read response payload is in pages */
4930                 cur_page_idx = pad_len / PAGE_SIZE;
4931                 cur_off = pad_len % PAGE_SIZE;
4932
4933                 if (cur_page_idx != 0) {
4934                         /* data offset is beyond the 1st page of response */
4935                         cifs_dbg(FYI, "%s: data offset (%u) beyond 1st page of response\n",
4936                                  __func__, data_offset);
4937                         rdata->result = -EIO;
4938                         if (is_offloaded)
4939                                 mid->mid_state = MID_RESPONSE_MALFORMED;
4940                         else
4941                                 dequeue_mid(mid, rdata->result);
4942                         return 0;
4943                 }
4944
4945                 if (data_len > page_data_size - pad_len) {
4946                         /* data_len is corrupt -- discard frame */
4947                         rdata->result = -EIO;
4948                         if (is_offloaded)
4949                                 mid->mid_state = MID_RESPONSE_MALFORMED;
4950                         else
4951                                 dequeue_mid(mid, rdata->result);
4952                         return 0;
4953                 }
4954
4955                 rdata->result = init_read_bvec(pages, npages, page_data_size,
4956                                                cur_off, &bvec);
4957                 if (rdata->result != 0) {
4958                         if (is_offloaded)
4959                                 mid->mid_state = MID_RESPONSE_MALFORMED;
4960                         else
4961                                 dequeue_mid(mid, rdata->result);
4962                         return 0;
4963                 }
4964
4965                 iov_iter_bvec(&iter, WRITE, bvec, npages, data_len);
4966         } else if (buf_len >= data_offset + data_len) {
4967                 /* read response payload is in buf */
4968                 WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
4969                 iov.iov_base = buf + data_offset;
4970                 iov.iov_len = data_len;
4971                 iov_iter_kvec(&iter, WRITE, &iov, 1, data_len);
4972         } else {
4973                 /* read response payload cannot be in both buf and pages */
4974                 WARN_ONCE(1, "buf can not contain only a part of read data");
4975                 rdata->result = -EIO;
4976                 if (is_offloaded)
4977                         mid->mid_state = MID_RESPONSE_MALFORMED;
4978                 else
4979                         dequeue_mid(mid, rdata->result);
4980                 return 0;
4981         }
4982
4983         length = rdata->copy_into_pages(server, rdata, &iter);
4984
4985         kfree(bvec);
4986
4987         if (length < 0)
4988                 return length;
4989
4990         if (is_offloaded)
4991                 mid->mid_state = MID_RESPONSE_RECEIVED;
4992         else
4993                 dequeue_mid(mid, false);
4994         return length;
4995 }
4996
4997 struct smb2_decrypt_work {
4998         struct work_struct decrypt;
4999         struct TCP_Server_Info *server;
5000         struct page **ppages;
5001         char *buf;
5002         unsigned int npages;
5003         unsigned int len;
5004 };
5005
5006
5007 static void smb2_decrypt_offload(struct work_struct *work)
5008 {
5009         struct smb2_decrypt_work *dw = container_of(work,
5010                                 struct smb2_decrypt_work, decrypt);
5011         int i, rc;
5012         struct mid_q_entry *mid;
5013
5014         rc = decrypt_raw_data(dw->server, dw->buf, dw->server->vals->read_rsp_size,
5015                               dw->ppages, dw->npages, dw->len, true);
5016         if (rc) {
5017                 cifs_dbg(VFS, "error decrypting rc=%d\n", rc);
5018                 goto free_pages;
5019         }
5020
5021         dw->server->lstrp = jiffies;
5022         mid = smb2_find_dequeue_mid(dw->server, dw->buf);
5023         if (mid == NULL)
5024                 cifs_dbg(FYI, "mid not found\n");
5025         else {
5026                 mid->decrypted = true;
5027                 rc = handle_read_data(dw->server, mid, dw->buf,
5028                                       dw->server->vals->read_rsp_size,
5029                                       dw->ppages, dw->npages, dw->len,
5030                                       true);
5031                 if (rc >= 0) {
5032 #ifdef CONFIG_CIFS_STATS2
5033                         mid->when_received = jiffies;
5034 #endif
5035                         if (dw->server->ops->is_network_name_deleted)
5036                                 dw->server->ops->is_network_name_deleted(dw->buf,
5037                                                                          dw->server);
5038
5039                         mid->callback(mid);
5040                 } else {
5041                         spin_lock(&cifs_tcp_ses_lock);
5042                         spin_lock(&GlobalMid_Lock);
5043                         if (dw->server->tcpStatus == CifsNeedReconnect) {
5044                                 mid->mid_state = MID_RETRY_NEEDED;
5045                                 spin_unlock(&GlobalMid_Lock);
5046                                 spin_unlock(&cifs_tcp_ses_lock);
5047                                 mid->callback(mid);
5048                         } else {
5049                                 mid->mid_state = MID_REQUEST_SUBMITTED;
5050                                 mid->mid_flags &= ~(MID_DELETED);
5051                                 list_add_tail(&mid->qhead,
5052                                         &dw->server->pending_mid_q);
5053                                 spin_unlock(&GlobalMid_Lock);
5054                                 spin_unlock(&cifs_tcp_ses_lock);
5055                         }
5056                 }
5057                 cifs_mid_q_entry_release(mid);
5058         }
5059
5060 free_pages:
5061         for (i = dw->npages-1; i >= 0; i--)
5062                 put_page(dw->ppages[i]);
5063
5064         kfree(dw->ppages);
5065         cifs_small_buf_release(dw->buf);
5066         kfree(dw);
5067 }
5068
5069
5070 static int
5071 receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid,
5072                        int *num_mids)
5073 {
5074         char *buf = server->smallbuf;
5075         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
5076         unsigned int npages;
5077         struct page **pages;
5078         unsigned int len;
5079         unsigned int buflen = server->pdu_size;
5080         int rc;
5081         int i = 0;
5082         struct smb2_decrypt_work *dw;
5083
5084         *num_mids = 1;
5085         len = min_t(unsigned int, buflen, server->vals->read_rsp_size +
5086                 sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
5087
5088         rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
5089         if (rc < 0)
5090                 return rc;
5091         server->total_read += rc;
5092
5093         len = le32_to_cpu(tr_hdr->OriginalMessageSize) -
5094                 server->vals->read_rsp_size;
5095         npages = DIV_ROUND_UP(len, PAGE_SIZE);
5096
5097         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
5098         if (!pages) {
5099                 rc = -ENOMEM;
5100                 goto discard_data;
5101         }
5102
5103         for (; i < npages; i++) {
5104                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
5105                 if (!pages[i]) {
5106                         rc = -ENOMEM;
5107                         goto discard_data;
5108                 }
5109         }
5110
5111         /* read read data into pages */
5112         rc = read_data_into_pages(server, pages, npages, len);
5113         if (rc)
5114                 goto free_pages;
5115
5116         rc = cifs_discard_remaining_data(server);
5117         if (rc)
5118                 goto free_pages;
5119
5120         /*
5121          * For large reads, offload to different thread for better performance,
5122          * use more cores decrypting which can be expensive
5123          */
5124
5125         if ((server->min_offload) && (server->in_flight > 1) &&
5126             (server->pdu_size >= server->min_offload)) {
5127                 dw = kmalloc(sizeof(struct smb2_decrypt_work), GFP_KERNEL);
5128                 if (dw == NULL)
5129                         goto non_offloaded_decrypt;
5130
5131                 dw->buf = server->smallbuf;
5132                 server->smallbuf = (char *)cifs_small_buf_get();
5133
5134                 INIT_WORK(&dw->decrypt, smb2_decrypt_offload);
5135
5136                 dw->npages = npages;
5137                 dw->server = server;
5138                 dw->ppages = pages;
5139                 dw->len = len;
5140                 queue_work(decrypt_wq, &dw->decrypt);
5141                 *num_mids = 0; /* worker thread takes care of finding mid */
5142                 return -1;
5143         }
5144
5145 non_offloaded_decrypt:
5146         rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size,
5147                               pages, npages, len, false);
5148         if (rc)
5149                 goto free_pages;
5150
5151         *mid = smb2_find_mid(server, buf);
5152         if (*mid == NULL)
5153                 cifs_dbg(FYI, "mid not found\n");
5154         else {
5155                 cifs_dbg(FYI, "mid found\n");
5156                 (*mid)->decrypted = true;
5157                 rc = handle_read_data(server, *mid, buf,
5158                                       server->vals->read_rsp_size,
5159                                       pages, npages, len, false);
5160                 if (rc >= 0) {
5161                         if (server->ops->is_network_name_deleted) {
5162                                 server->ops->is_network_name_deleted(buf,
5163                                                                 server);
5164                         }
5165                 }
5166         }
5167
5168 free_pages:
5169         for (i = i - 1; i >= 0; i--)
5170                 put_page(pages[i]);
5171         kfree(pages);
5172         return rc;
5173 discard_data:
5174         cifs_discard_remaining_data(server);
5175         goto free_pages;
5176 }
5177
5178 static int
5179 receive_encrypted_standard(struct TCP_Server_Info *server,
5180                            struct mid_q_entry **mids, char **bufs,
5181                            int *num_mids)
5182 {
5183         int ret, length;
5184         char *buf = server->smallbuf;
5185         struct smb2_hdr *shdr;
5186         unsigned int pdu_length = server->pdu_size;
5187         unsigned int buf_size;
5188         struct mid_q_entry *mid_entry;
5189         int next_is_large;
5190         char *next_buffer = NULL;
5191
5192         *num_mids = 0;
5193
5194         /* switch to large buffer if too big for a small one */
5195         if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE) {
5196                 server->large_buf = true;
5197                 memcpy(server->bigbuf, buf, server->total_read);
5198                 buf = server->bigbuf;
5199         }
5200
5201         /* now read the rest */
5202         length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
5203                                 pdu_length - HEADER_SIZE(server) + 1);
5204         if (length < 0)
5205                 return length;
5206         server->total_read += length;
5207
5208         buf_size = pdu_length - sizeof(struct smb2_transform_hdr);
5209         length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0, false);
5210         if (length)
5211                 return length;
5212
5213         next_is_large = server->large_buf;
5214 one_more:
5215         shdr = (struct smb2_hdr *)buf;
5216         if (shdr->NextCommand) {
5217                 if (next_is_large)
5218                         next_buffer = (char *)cifs_buf_get();
5219                 else
5220                         next_buffer = (char *)cifs_small_buf_get();
5221                 memcpy(next_buffer,
5222                        buf + le32_to_cpu(shdr->NextCommand),
5223                        pdu_length - le32_to_cpu(shdr->NextCommand));
5224         }
5225
5226         mid_entry = smb2_find_mid(server, buf);
5227         if (mid_entry == NULL)
5228                 cifs_dbg(FYI, "mid not found\n");
5229         else {
5230                 cifs_dbg(FYI, "mid found\n");
5231                 mid_entry->decrypted = true;
5232                 mid_entry->resp_buf_size = server->pdu_size;
5233         }
5234
5235         if (*num_mids >= MAX_COMPOUND) {
5236                 cifs_server_dbg(VFS, "too many PDUs in compound\n");
5237                 return -1;
5238         }
5239         bufs[*num_mids] = buf;
5240         mids[(*num_mids)++] = mid_entry;
5241
5242         if (mid_entry && mid_entry->handle)
5243                 ret = mid_entry->handle(server, mid_entry);
5244         else
5245                 ret = cifs_handle_standard(server, mid_entry);
5246
5247         if (ret == 0 && shdr->NextCommand) {
5248                 pdu_length -= le32_to_cpu(shdr->NextCommand);
5249                 server->large_buf = next_is_large;
5250                 if (next_is_large)
5251                         server->bigbuf = buf = next_buffer;
5252                 else
5253                         server->smallbuf = buf = next_buffer;
5254                 goto one_more;
5255         } else if (ret != 0) {
5256                 /*
5257                  * ret != 0 here means that we didn't get to handle_mid() thus
5258                  * server->smallbuf and server->bigbuf are still valid. We need
5259                  * to free next_buffer because it is not going to be used
5260                  * anywhere.
5261                  */
5262                 if (next_is_large)
5263                         free_rsp_buf(CIFS_LARGE_BUFFER, next_buffer);
5264                 else
5265                         free_rsp_buf(CIFS_SMALL_BUFFER, next_buffer);
5266         }
5267
5268         return ret;
5269 }
5270
5271 static int
5272 smb3_receive_transform(struct TCP_Server_Info *server,
5273                        struct mid_q_entry **mids, char **bufs, int *num_mids)
5274 {
5275         char *buf = server->smallbuf;
5276         unsigned int pdu_length = server->pdu_size;
5277         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
5278         unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
5279
5280         if (pdu_length < sizeof(struct smb2_transform_hdr) +
5281                                                 sizeof(struct smb2_hdr)) {
5282                 cifs_server_dbg(VFS, "Transform message is too small (%u)\n",
5283                          pdu_length);
5284                 cifs_reconnect(server, true);
5285                 return -ECONNABORTED;
5286         }
5287
5288         if (pdu_length < orig_len + sizeof(struct smb2_transform_hdr)) {
5289                 cifs_server_dbg(VFS, "Transform message is broken\n");
5290                 cifs_reconnect(server, true);
5291                 return -ECONNABORTED;
5292         }
5293
5294         /* TODO: add support for compounds containing READ. */
5295         if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server)) {
5296                 return receive_encrypted_read(server, &mids[0], num_mids);
5297         }
5298
5299         return receive_encrypted_standard(server, mids, bufs, num_mids);
5300 }
5301
5302 int
5303 smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
5304 {
5305         char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
5306
5307         return handle_read_data(server, mid, buf, server->pdu_size,
5308                                 NULL, 0, 0, false);
5309 }
5310
5311 static int
5312 smb2_next_header(char *buf)
5313 {
5314         struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
5315         struct smb2_transform_hdr *t_hdr = (struct smb2_transform_hdr *)buf;
5316
5317         if (hdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM)
5318                 return sizeof(struct smb2_transform_hdr) +
5319                   le32_to_cpu(t_hdr->OriginalMessageSize);
5320
5321         return le32_to_cpu(hdr->NextCommand);
5322 }
5323
5324 static int
5325 smb2_make_node(unsigned int xid, struct inode *inode,
5326                struct dentry *dentry, struct cifs_tcon *tcon,
5327                const char *full_path, umode_t mode, dev_t dev)
5328 {
5329         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
5330         int rc = -EPERM;
5331         FILE_ALL_INFO *buf = NULL;
5332         struct cifs_io_parms io_parms = {0};
5333         __u32 oplock = 0;
5334         struct cifs_fid fid;
5335         struct cifs_open_parms oparms;
5336         unsigned int bytes_written;
5337         struct win_dev *pdev;
5338         struct kvec iov[2];
5339
5340         /*
5341          * Check if mounted with mount parm 'sfu' mount parm.
5342          * SFU emulation should work with all servers, but only
5343          * supports block and char device (no socket & fifo),
5344          * and was used by default in earlier versions of Windows
5345          */
5346         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
5347                 goto out;
5348
5349         /*
5350          * TODO: Add ability to create instead via reparse point. Windows (e.g.
5351          * their current NFS server) uses this approach to expose special files
5352          * over SMB2/SMB3 and Samba will do this with SMB3.1.1 POSIX Extensions
5353          */
5354
5355         if (!S_ISCHR(mode) && !S_ISBLK(mode))
5356                 goto out;
5357
5358         cifs_dbg(FYI, "sfu compat create special file\n");
5359
5360         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
5361         if (buf == NULL) {
5362                 rc = -ENOMEM;
5363                 goto out;
5364         }
5365
5366         oparms.tcon = tcon;
5367         oparms.cifs_sb = cifs_sb;
5368         oparms.desired_access = GENERIC_WRITE;
5369         oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR |
5370                                                     CREATE_OPTION_SPECIAL);
5371         oparms.disposition = FILE_CREATE;
5372         oparms.path = full_path;
5373         oparms.fid = &fid;
5374         oparms.reconnect = false;
5375
5376         if (tcon->ses->server->oplocks)
5377                 oplock = REQ_OPLOCK;
5378         else
5379                 oplock = 0;
5380         rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
5381         if (rc)
5382                 goto out;
5383
5384         /*
5385          * BB Do not bother to decode buf since no local inode yet to put
5386          * timestamps in, but we can reuse it safely.
5387          */
5388
5389         pdev = (struct win_dev *)buf;
5390         io_parms.pid = current->tgid;
5391         io_parms.tcon = tcon;
5392         io_parms.offset = 0;
5393         io_parms.length = sizeof(struct win_dev);
5394         iov[1].iov_base = buf;
5395         iov[1].iov_len = sizeof(struct win_dev);
5396         if (S_ISCHR(mode)) {
5397                 memcpy(pdev->type, "IntxCHR", 8);
5398                 pdev->major = cpu_to_le64(MAJOR(dev));
5399                 pdev->minor = cpu_to_le64(MINOR(dev));
5400                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
5401                                                         &bytes_written, iov, 1);
5402         } else if (S_ISBLK(mode)) {
5403                 memcpy(pdev->type, "IntxBLK", 8);
5404                 pdev->major = cpu_to_le64(MAJOR(dev));
5405                 pdev->minor = cpu_to_le64(MINOR(dev));
5406                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
5407                                                         &bytes_written, iov, 1);
5408         }
5409         tcon->ses->server->ops->close(xid, tcon, &fid);
5410         d_drop(dentry);
5411
5412         /* FIXME: add code here to set EAs */
5413 out:
5414         kfree(buf);
5415         return rc;
5416 }
5417
5418
5419 struct smb_version_operations smb20_operations = {
5420         .compare_fids = smb2_compare_fids,
5421         .setup_request = smb2_setup_request,
5422         .setup_async_request = smb2_setup_async_request,
5423         .check_receive = smb2_check_receive,
5424         .add_credits = smb2_add_credits,
5425         .set_credits = smb2_set_credits,
5426         .get_credits_field = smb2_get_credits_field,
5427         .get_credits = smb2_get_credits,
5428         .wait_mtu_credits = cifs_wait_mtu_credits,
5429         .get_next_mid = smb2_get_next_mid,
5430         .revert_current_mid = smb2_revert_current_mid,
5431         .read_data_offset = smb2_read_data_offset,
5432         .read_data_length = smb2_read_data_length,
5433         .map_error = map_smb2_to_linux_error,
5434         .find_mid = smb2_find_mid,
5435         .check_message = smb2_check_message,
5436         .dump_detail = smb2_dump_detail,
5437         .clear_stats = smb2_clear_stats,
5438         .print_stats = smb2_print_stats,
5439         .is_oplock_break = smb2_is_valid_oplock_break,
5440         .handle_cancelled_mid = smb2_handle_cancelled_mid,
5441         .downgrade_oplock = smb2_downgrade_oplock,
5442         .need_neg = smb2_need_neg,
5443         .negotiate = smb2_negotiate,
5444         .negotiate_wsize = smb2_negotiate_wsize,
5445         .negotiate_rsize = smb2_negotiate_rsize,
5446         .sess_setup = SMB2_sess_setup,
5447         .logoff = SMB2_logoff,
5448         .tree_connect = SMB2_tcon,
5449         .tree_disconnect = SMB2_tdis,
5450         .qfs_tcon = smb2_qfs_tcon,
5451         .is_path_accessible = smb2_is_path_accessible,
5452         .can_echo = smb2_can_echo,
5453         .echo = SMB2_echo,
5454         .query_path_info = smb2_query_path_info,
5455         .get_srv_inum = smb2_get_srv_inum,
5456         .query_file_info = smb2_query_file_info,
5457         .set_path_size = smb2_set_path_size,
5458         .set_file_size = smb2_set_file_size,
5459         .set_file_info = smb2_set_file_info,
5460         .set_compression = smb2_set_compression,
5461         .mkdir = smb2_mkdir,
5462         .mkdir_setinfo = smb2_mkdir_setinfo,
5463         .rmdir = smb2_rmdir,
5464         .unlink = smb2_unlink,
5465         .rename = smb2_rename_path,
5466         .create_hardlink = smb2_create_hardlink,
5467         .query_symlink = smb2_query_symlink,
5468         .query_mf_symlink = smb3_query_mf_symlink,
5469         .create_mf_symlink = smb3_create_mf_symlink,
5470         .open = smb2_open_file,
5471         .set_fid = smb2_set_fid,
5472         .close = smb2_close_file,
5473         .flush = smb2_flush_file,
5474         .async_readv = smb2_async_readv,
5475         .async_writev = smb2_async_writev,
5476         .sync_read = smb2_sync_read,
5477         .sync_write = smb2_sync_write,
5478         .query_dir_first = smb2_query_dir_first,
5479         .query_dir_next = smb2_query_dir_next,
5480         .close_dir = smb2_close_dir,
5481         .calc_smb_size = smb2_calc_size,
5482         .is_status_pending = smb2_is_status_pending,
5483         .is_session_expired = smb2_is_session_expired,
5484         .oplock_response = smb2_oplock_response,
5485         .queryfs = smb2_queryfs,
5486         .mand_lock = smb2_mand_lock,
5487         .mand_unlock_range = smb2_unlock_range,
5488         .push_mand_locks = smb2_push_mandatory_locks,
5489         .get_lease_key = smb2_get_lease_key,
5490         .set_lease_key = smb2_set_lease_key,
5491         .new_lease_key = smb2_new_lease_key,
5492         .calc_signature = smb2_calc_signature,
5493         .is_read_op = smb2_is_read_op,
5494         .set_oplock_level = smb2_set_oplock_level,
5495         .create_lease_buf = smb2_create_lease_buf,
5496         .parse_lease_buf = smb2_parse_lease_buf,
5497         .copychunk_range = smb2_copychunk_range,
5498         .wp_retry_size = smb2_wp_retry_size,
5499         .dir_needs_close = smb2_dir_needs_close,
5500         .get_dfs_refer = smb2_get_dfs_refer,
5501         .select_sectype = smb2_select_sectype,
5502 #ifdef CONFIG_CIFS_XATTR
5503         .query_all_EAs = smb2_query_eas,
5504         .set_EA = smb2_set_ea,
5505 #endif /* CIFS_XATTR */
5506         .get_acl = get_smb2_acl,
5507         .get_acl_by_fid = get_smb2_acl_by_fid,
5508         .set_acl = set_smb2_acl,
5509         .next_header = smb2_next_header,
5510         .ioctl_query_info = smb2_ioctl_query_info,
5511         .make_node = smb2_make_node,
5512         .fiemap = smb3_fiemap,
5513         .llseek = smb3_llseek,
5514         .is_status_io_timeout = smb2_is_status_io_timeout,
5515         .is_network_name_deleted = smb2_is_network_name_deleted,
5516 };
5517
5518 struct smb_version_operations smb21_operations = {
5519         .compare_fids = smb2_compare_fids,
5520         .setup_request = smb2_setup_request,
5521         .setup_async_request = smb2_setup_async_request,
5522         .check_receive = smb2_check_receive,
5523         .add_credits = smb2_add_credits,
5524         .set_credits = smb2_set_credits,
5525         .get_credits_field = smb2_get_credits_field,
5526         .get_credits = smb2_get_credits,
5527         .wait_mtu_credits = smb2_wait_mtu_credits,
5528         .adjust_credits = smb2_adjust_credits,
5529         .get_next_mid = smb2_get_next_mid,
5530         .revert_current_mid = smb2_revert_current_mid,
5531         .read_data_offset = smb2_read_data_offset,
5532         .read_data_length = smb2_read_data_length,
5533         .map_error = map_smb2_to_linux_error,
5534         .find_mid = smb2_find_mid,
5535         .check_message = smb2_check_message,
5536         .dump_detail = smb2_dump_detail,
5537         .clear_stats = smb2_clear_stats,
5538         .print_stats = smb2_print_stats,
5539         .is_oplock_break = smb2_is_valid_oplock_break,
5540         .handle_cancelled_mid = smb2_handle_cancelled_mid,
5541         .downgrade_oplock = smb2_downgrade_oplock,
5542         .need_neg = smb2_need_neg,
5543         .negotiate = smb2_negotiate,
5544         .negotiate_wsize = smb2_negotiate_wsize,
5545         .negotiate_rsize = smb2_negotiate_rsize,
5546         .sess_setup = SMB2_sess_setup,
5547         .logoff = SMB2_logoff,
5548         .tree_connect = SMB2_tcon,
5549         .tree_disconnect = SMB2_tdis,
5550         .qfs_tcon = smb2_qfs_tcon,
5551         .is_path_accessible = smb2_is_path_accessible,
5552         .can_echo = smb2_can_echo,
5553         .echo = SMB2_echo,
5554         .query_path_info = smb2_query_path_info,
5555         .get_srv_inum = smb2_get_srv_inum,
5556         .query_file_info = smb2_query_file_info,
5557         .set_path_size = smb2_set_path_size,
5558         .set_file_size = smb2_set_file_size,
5559         .set_file_info = smb2_set_file_info,
5560         .set_compression = smb2_set_compression,
5561         .mkdir = smb2_mkdir,
5562         .mkdir_setinfo = smb2_mkdir_setinfo,
5563         .rmdir = smb2_rmdir,
5564         .unlink = smb2_unlink,
5565         .rename = smb2_rename_path,
5566         .create_hardlink = smb2_create_hardlink,
5567         .query_symlink = smb2_query_symlink,
5568         .query_mf_symlink = smb3_query_mf_symlink,
5569         .create_mf_symlink = smb3_create_mf_symlink,
5570         .open = smb2_open_file,
5571         .set_fid = smb2_set_fid,
5572         .close = smb2_close_file,
5573         .flush = smb2_flush_file,
5574         .async_readv = smb2_async_readv,
5575         .async_writev = smb2_async_writev,
5576         .sync_read = smb2_sync_read,
5577         .sync_write = smb2_sync_write,
5578         .query_dir_first = smb2_query_dir_first,
5579         .query_dir_next = smb2_query_dir_next,
5580         .close_dir = smb2_close_dir,
5581         .calc_smb_size = smb2_calc_size,
5582         .is_status_pending = smb2_is_status_pending,
5583         .is_session_expired = smb2_is_session_expired,
5584         .oplock_response = smb2_oplock_response,
5585         .queryfs = smb2_queryfs,
5586         .mand_lock = smb2_mand_lock,
5587         .mand_unlock_range = smb2_unlock_range,
5588         .push_mand_locks = smb2_push_mandatory_locks,
5589         .get_lease_key = smb2_get_lease_key,
5590         .set_lease_key = smb2_set_lease_key,
5591         .new_lease_key = smb2_new_lease_key,
5592         .calc_signature = smb2_calc_signature,
5593         .is_read_op = smb21_is_read_op,
5594         .set_oplock_level = smb21_set_oplock_level,
5595         .create_lease_buf = smb2_create_lease_buf,
5596         .parse_lease_buf = smb2_parse_lease_buf,
5597         .copychunk_range = smb2_copychunk_range,
5598         .wp_retry_size = smb2_wp_retry_size,
5599         .dir_needs_close = smb2_dir_needs_close,
5600         .enum_snapshots = smb3_enum_snapshots,
5601         .notify = smb3_notify,
5602         .get_dfs_refer = smb2_get_dfs_refer,
5603         .select_sectype = smb2_select_sectype,
5604 #ifdef CONFIG_CIFS_XATTR
5605         .query_all_EAs = smb2_query_eas,
5606         .set_EA = smb2_set_ea,
5607 #endif /* CIFS_XATTR */
5608         .get_acl = get_smb2_acl,
5609         .get_acl_by_fid = get_smb2_acl_by_fid,
5610         .set_acl = set_smb2_acl,
5611         .next_header = smb2_next_header,
5612         .ioctl_query_info = smb2_ioctl_query_info,
5613         .make_node = smb2_make_node,
5614         .fiemap = smb3_fiemap,
5615         .llseek = smb3_llseek,
5616         .is_status_io_timeout = smb2_is_status_io_timeout,
5617         .is_network_name_deleted = smb2_is_network_name_deleted,
5618 };
5619
5620 struct smb_version_operations smb30_operations = {
5621         .compare_fids = smb2_compare_fids,
5622         .setup_request = smb2_setup_request,
5623         .setup_async_request = smb2_setup_async_request,
5624         .check_receive = smb2_check_receive,
5625         .add_credits = smb2_add_credits,
5626         .set_credits = smb2_set_credits,
5627         .get_credits_field = smb2_get_credits_field,
5628         .get_credits = smb2_get_credits,
5629         .wait_mtu_credits = smb2_wait_mtu_credits,
5630         .adjust_credits = smb2_adjust_credits,
5631         .get_next_mid = smb2_get_next_mid,
5632         .revert_current_mid = smb2_revert_current_mid,
5633         .read_data_offset = smb2_read_data_offset,
5634         .read_data_length = smb2_read_data_length,
5635         .map_error = map_smb2_to_linux_error,
5636         .find_mid = smb2_find_mid,
5637         .check_message = smb2_check_message,
5638         .dump_detail = smb2_dump_detail,
5639         .clear_stats = smb2_clear_stats,
5640         .print_stats = smb2_print_stats,
5641         .dump_share_caps = smb2_dump_share_caps,
5642         .is_oplock_break = smb2_is_valid_oplock_break,
5643         .handle_cancelled_mid = smb2_handle_cancelled_mid,
5644         .downgrade_oplock = smb3_downgrade_oplock,
5645         .need_neg = smb2_need_neg,
5646         .negotiate = smb2_negotiate,
5647         .negotiate_wsize = smb3_negotiate_wsize,
5648         .negotiate_rsize = smb3_negotiate_rsize,
5649         .sess_setup = SMB2_sess_setup,
5650         .logoff = SMB2_logoff,
5651         .tree_connect = SMB2_tcon,
5652         .tree_disconnect = SMB2_tdis,
5653         .qfs_tcon = smb3_qfs_tcon,
5654         .is_path_accessible = smb2_is_path_accessible,
5655         .can_echo = smb2_can_echo,
5656         .echo = SMB2_echo,
5657         .query_path_info = smb2_query_path_info,
5658         /* WSL tags introduced long after smb2.1, enable for SMB3, 3.11 only */
5659         .query_reparse_tag = smb2_query_reparse_tag,
5660         .get_srv_inum = smb2_get_srv_inum,
5661         .query_file_info = smb2_query_file_info,
5662         .set_path_size = smb2_set_path_size,
5663         .set_file_size = smb2_set_file_size,
5664         .set_file_info = smb2_set_file_info,
5665         .set_compression = smb2_set_compression,
5666         .mkdir = smb2_mkdir,
5667         .mkdir_setinfo = smb2_mkdir_setinfo,
5668         .rmdir = smb2_rmdir,
5669         .unlink = smb2_unlink,
5670         .rename = smb2_rename_path,
5671         .create_hardlink = smb2_create_hardlink,
5672         .query_symlink = smb2_query_symlink,
5673         .query_mf_symlink = smb3_query_mf_symlink,
5674         .create_mf_symlink = smb3_create_mf_symlink,
5675         .open = smb2_open_file,
5676         .set_fid = smb2_set_fid,
5677         .close = smb2_close_file,
5678         .close_getattr = smb2_close_getattr,
5679         .flush = smb2_flush_file,
5680         .async_readv = smb2_async_readv,
5681         .async_writev = smb2_async_writev,
5682         .sync_read = smb2_sync_read,
5683         .sync_write = smb2_sync_write,
5684         .query_dir_first = smb2_query_dir_first,
5685         .query_dir_next = smb2_query_dir_next,
5686         .close_dir = smb2_close_dir,
5687         .calc_smb_size = smb2_calc_size,
5688         .is_status_pending = smb2_is_status_pending,
5689         .is_session_expired = smb2_is_session_expired,
5690         .oplock_response = smb2_oplock_response,
5691         .queryfs = smb2_queryfs,
5692         .mand_lock = smb2_mand_lock,
5693         .mand_unlock_range = smb2_unlock_range,
5694         .push_mand_locks = smb2_push_mandatory_locks,
5695         .get_lease_key = smb2_get_lease_key,
5696         .set_lease_key = smb2_set_lease_key,
5697         .new_lease_key = smb2_new_lease_key,
5698         .generate_signingkey = generate_smb30signingkey,
5699         .calc_signature = smb3_calc_signature,
5700         .set_integrity  = smb3_set_integrity,
5701         .is_read_op = smb21_is_read_op,
5702         .set_oplock_level = smb3_set_oplock_level,
5703         .create_lease_buf = smb3_create_lease_buf,
5704         .parse_lease_buf = smb3_parse_lease_buf,
5705         .copychunk_range = smb2_copychunk_range,
5706         .duplicate_extents = smb2_duplicate_extents,
5707         .validate_negotiate = smb3_validate_negotiate,
5708         .wp_retry_size = smb2_wp_retry_size,
5709         .dir_needs_close = smb2_dir_needs_close,
5710         .fallocate = smb3_fallocate,
5711         .enum_snapshots = smb3_enum_snapshots,
5712         .notify = smb3_notify,
5713         .init_transform_rq = smb3_init_transform_rq,
5714         .is_transform_hdr = smb3_is_transform_hdr,
5715         .receive_transform = smb3_receive_transform,
5716         .get_dfs_refer = smb2_get_dfs_refer,
5717         .select_sectype = smb2_select_sectype,
5718 #ifdef CONFIG_CIFS_XATTR
5719         .query_all_EAs = smb2_query_eas,
5720         .set_EA = smb2_set_ea,
5721 #endif /* CIFS_XATTR */
5722         .get_acl = get_smb2_acl,
5723         .get_acl_by_fid = get_smb2_acl_by_fid,
5724         .set_acl = set_smb2_acl,
5725         .next_header = smb2_next_header,
5726         .ioctl_query_info = smb2_ioctl_query_info,
5727         .make_node = smb2_make_node,
5728         .fiemap = smb3_fiemap,
5729         .llseek = smb3_llseek,
5730         .is_status_io_timeout = smb2_is_status_io_timeout,
5731         .is_network_name_deleted = smb2_is_network_name_deleted,
5732 };
5733
5734 struct smb_version_operations smb311_operations = {
5735         .compare_fids = smb2_compare_fids,
5736         .setup_request = smb2_setup_request,
5737         .setup_async_request = smb2_setup_async_request,
5738         .check_receive = smb2_check_receive,
5739         .add_credits = smb2_add_credits,
5740         .set_credits = smb2_set_credits,
5741         .get_credits_field = smb2_get_credits_field,
5742         .get_credits = smb2_get_credits,
5743         .wait_mtu_credits = smb2_wait_mtu_credits,
5744         .adjust_credits = smb2_adjust_credits,
5745         .get_next_mid = smb2_get_next_mid,
5746         .revert_current_mid = smb2_revert_current_mid,
5747         .read_data_offset = smb2_read_data_offset,
5748         .read_data_length = smb2_read_data_length,
5749         .map_error = map_smb2_to_linux_error,
5750         .find_mid = smb2_find_mid,
5751         .check_message = smb2_check_message,
5752         .dump_detail = smb2_dump_detail,
5753         .clear_stats = smb2_clear_stats,
5754         .print_stats = smb2_print_stats,
5755         .dump_share_caps = smb2_dump_share_caps,
5756         .is_oplock_break = smb2_is_valid_oplock_break,
5757         .handle_cancelled_mid = smb2_handle_cancelled_mid,
5758         .downgrade_oplock = smb3_downgrade_oplock,
5759         .need_neg = smb2_need_neg,
5760         .negotiate = smb2_negotiate,
5761         .negotiate_wsize = smb3_negotiate_wsize,
5762         .negotiate_rsize = smb3_negotiate_rsize,
5763         .sess_setup = SMB2_sess_setup,
5764         .logoff = SMB2_logoff,
5765         .tree_connect = SMB2_tcon,
5766         .tree_disconnect = SMB2_tdis,
5767         .qfs_tcon = smb3_qfs_tcon,
5768         .is_path_accessible = smb2_is_path_accessible,
5769         .can_echo = smb2_can_echo,
5770         .echo = SMB2_echo,
5771         .query_path_info = smb2_query_path_info,
5772         .query_reparse_tag = smb2_query_reparse_tag,
5773         .get_srv_inum = smb2_get_srv_inum,
5774         .query_file_info = smb2_query_file_info,
5775         .set_path_size = smb2_set_path_size,
5776         .set_file_size = smb2_set_file_size,
5777         .set_file_info = smb2_set_file_info,
5778         .set_compression = smb2_set_compression,
5779         .mkdir = smb2_mkdir,
5780         .mkdir_setinfo = smb2_mkdir_setinfo,
5781         .posix_mkdir = smb311_posix_mkdir,
5782         .rmdir = smb2_rmdir,
5783         .unlink = smb2_unlink,
5784         .rename = smb2_rename_path,
5785         .create_hardlink = smb2_create_hardlink,
5786         .query_symlink = smb2_query_symlink,
5787         .query_mf_symlink = smb3_query_mf_symlink,
5788         .create_mf_symlink = smb3_create_mf_symlink,
5789         .open = smb2_open_file,
5790         .set_fid = smb2_set_fid,
5791         .close = smb2_close_file,
5792         .close_getattr = smb2_close_getattr,
5793         .flush = smb2_flush_file,
5794         .async_readv = smb2_async_readv,
5795         .async_writev = smb2_async_writev,
5796         .sync_read = smb2_sync_read,
5797         .sync_write = smb2_sync_write,
5798         .query_dir_first = smb2_query_dir_first,
5799         .query_dir_next = smb2_query_dir_next,
5800         .close_dir = smb2_close_dir,
5801         .calc_smb_size = smb2_calc_size,
5802         .is_status_pending = smb2_is_status_pending,
5803         .is_session_expired = smb2_is_session_expired,
5804         .oplock_response = smb2_oplock_response,
5805         .queryfs = smb311_queryfs,
5806         .mand_lock = smb2_mand_lock,
5807         .mand_unlock_range = smb2_unlock_range,
5808         .push_mand_locks = smb2_push_mandatory_locks,
5809         .get_lease_key = smb2_get_lease_key,
5810         .set_lease_key = smb2_set_lease_key,
5811         .new_lease_key = smb2_new_lease_key,
5812         .generate_signingkey = generate_smb311signingkey,
5813         .calc_signature = smb3_calc_signature,
5814         .set_integrity  = smb3_set_integrity,
5815         .is_read_op = smb21_is_read_op,
5816         .set_oplock_level = smb3_set_oplock_level,
5817         .create_lease_buf = smb3_create_lease_buf,
5818         .parse_lease_buf = smb3_parse_lease_buf,
5819         .copychunk_range = smb2_copychunk_range,
5820         .duplicate_extents = smb2_duplicate_extents,
5821 /*      .validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
5822         .wp_retry_size = smb2_wp_retry_size,
5823         .dir_needs_close = smb2_dir_needs_close,
5824         .fallocate = smb3_fallocate,
5825         .enum_snapshots = smb3_enum_snapshots,
5826         .notify = smb3_notify,
5827         .init_transform_rq = smb3_init_transform_rq,
5828         .is_transform_hdr = smb3_is_transform_hdr,
5829         .receive_transform = smb3_receive_transform,
5830         .get_dfs_refer = smb2_get_dfs_refer,
5831         .select_sectype = smb2_select_sectype,
5832 #ifdef CONFIG_CIFS_XATTR
5833         .query_all_EAs = smb2_query_eas,
5834         .set_EA = smb2_set_ea,
5835 #endif /* CIFS_XATTR */
5836         .get_acl = get_smb2_acl,
5837         .get_acl_by_fid = get_smb2_acl_by_fid,
5838         .set_acl = set_smb2_acl,
5839         .next_header = smb2_next_header,
5840         .ioctl_query_info = smb2_ioctl_query_info,
5841         .make_node = smb2_make_node,
5842         .fiemap = smb3_fiemap,
5843         .llseek = smb3_llseek,
5844         .is_status_io_timeout = smb2_is_status_io_timeout,
5845         .is_network_name_deleted = smb2_is_network_name_deleted,
5846 };
5847
5848 struct smb_version_values smb20_values = {
5849         .version_string = SMB20_VERSION_STRING,
5850         .protocol_id = SMB20_PROT_ID,
5851         .req_capabilities = 0, /* MBZ */
5852         .large_lock_type = 0,
5853         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5854         .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5855         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5856         .header_size = sizeof(struct smb2_hdr),
5857         .header_preamble_size = 0,
5858         .max_header_size = MAX_SMB2_HDR_SIZE,
5859         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5860         .lock_cmd = SMB2_LOCK,
5861         .cap_unix = 0,
5862         .cap_nt_find = SMB2_NT_FIND,
5863         .cap_large_files = SMB2_LARGE_FILES,
5864         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5865         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5866         .create_lease_size = sizeof(struct create_lease),
5867 };
5868
5869 struct smb_version_values smb21_values = {
5870         .version_string = SMB21_VERSION_STRING,
5871         .protocol_id = SMB21_PROT_ID,
5872         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
5873         .large_lock_type = 0,
5874         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5875         .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5876         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5877         .header_size = sizeof(struct smb2_hdr),
5878         .header_preamble_size = 0,
5879         .max_header_size = MAX_SMB2_HDR_SIZE,
5880         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5881         .lock_cmd = SMB2_LOCK,
5882         .cap_unix = 0,
5883         .cap_nt_find = SMB2_NT_FIND,
5884         .cap_large_files = SMB2_LARGE_FILES,
5885         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5886         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5887         .create_lease_size = sizeof(struct create_lease),
5888 };
5889
5890 struct smb_version_values smb3any_values = {
5891         .version_string = SMB3ANY_VERSION_STRING,
5892         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
5893         .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,
5894         .large_lock_type = 0,
5895         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5896         .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5897         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5898         .header_size = sizeof(struct smb2_hdr),
5899         .header_preamble_size = 0,
5900         .max_header_size = MAX_SMB2_HDR_SIZE,
5901         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5902         .lock_cmd = SMB2_LOCK,
5903         .cap_unix = 0,
5904         .cap_nt_find = SMB2_NT_FIND,
5905         .cap_large_files = SMB2_LARGE_FILES,
5906         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5907         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5908         .create_lease_size = sizeof(struct create_lease_v2),
5909 };
5910
5911 struct smb_version_values smbdefault_values = {
5912         .version_string = SMBDEFAULT_VERSION_STRING,
5913         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
5914         .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,
5915         .large_lock_type = 0,
5916         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5917         .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5918         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5919         .header_size = sizeof(struct smb2_hdr),
5920         .header_preamble_size = 0,
5921         .max_header_size = MAX_SMB2_HDR_SIZE,
5922         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5923         .lock_cmd = SMB2_LOCK,
5924         .cap_unix = 0,
5925         .cap_nt_find = SMB2_NT_FIND,
5926         .cap_large_files = SMB2_LARGE_FILES,
5927         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5928         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5929         .create_lease_size = sizeof(struct create_lease_v2),
5930 };
5931
5932 struct smb_version_values smb30_values = {
5933         .version_string = SMB30_VERSION_STRING,
5934         .protocol_id = SMB30_PROT_ID,
5935         .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,
5936         .large_lock_type = 0,
5937         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5938         .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5939         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5940         .header_size = sizeof(struct smb2_hdr),
5941         .header_preamble_size = 0,
5942         .max_header_size = MAX_SMB2_HDR_SIZE,
5943         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5944         .lock_cmd = SMB2_LOCK,
5945         .cap_unix = 0,
5946         .cap_nt_find = SMB2_NT_FIND,
5947         .cap_large_files = SMB2_LARGE_FILES,
5948         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5949         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5950         .create_lease_size = sizeof(struct create_lease_v2),
5951 };
5952
5953 struct smb_version_values smb302_values = {
5954         .version_string = SMB302_VERSION_STRING,
5955         .protocol_id = SMB302_PROT_ID,
5956         .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,
5957         .large_lock_type = 0,
5958         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5959         .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5960         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5961         .header_size = sizeof(struct smb2_hdr),
5962         .header_preamble_size = 0,
5963         .max_header_size = MAX_SMB2_HDR_SIZE,
5964         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5965         .lock_cmd = SMB2_LOCK,
5966         .cap_unix = 0,
5967         .cap_nt_find = SMB2_NT_FIND,
5968         .cap_large_files = SMB2_LARGE_FILES,
5969         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5970         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5971         .create_lease_size = sizeof(struct create_lease_v2),
5972 };
5973
5974 struct smb_version_values smb311_values = {
5975         .version_string = SMB311_VERSION_STRING,
5976         .protocol_id = SMB311_PROT_ID,
5977         .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,
5978         .large_lock_type = 0,
5979         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE,
5980         .shared_lock_type = SMB2_LOCKFLAG_SHARED,
5981         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5982         .header_size = sizeof(struct smb2_hdr),
5983         .header_preamble_size = 0,
5984         .max_header_size = MAX_SMB2_HDR_SIZE,
5985         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5986         .lock_cmd = SMB2_LOCK,
5987         .cap_unix = 0,
5988         .cap_nt_find = SMB2_NT_FIND,
5989         .cap_large_files = SMB2_LARGE_FILES,
5990         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5991         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5992         .create_lease_size = sizeof(struct create_lease_v2),
5993 };