fs/cifs/smb2ops.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  SMB2 version specific operations
   4  *
   5  *  Copyright (c) 2012, Jeff Layton <[email protected]>
   6  */
   7
   8 #include <linux/pagemap.h>
   9 #include <linux/vfs.h>
  10 #include <linux/falloc.h>
  11 #include <linux/scatterlist.h>
  12 #include <linux/uuid.h>
  13 #include <crypto/aead.h>
  14 #include "cifsglob.h"
  15 #include "smb2pdu.h"
  16 #include "smb2proto.h"
  17 #include "cifsproto.h"
  18 #include "cifs_debug.h"
  19 #include "cifs_unicode.h"
  20 #include "smb2status.h"
  21 #include "smb2glob.h"
  22 #include "cifs_ioctl.h"
  23 #include "smbdirect.h"
  24
  25 /* Change credits for different ops and return the total number of credits */
  26 static int
  27 change_conf(struct TCP_Server_Info *server)
  28 {
  29         server->credits += server->echo_credits + server->oplock_credits;
  30         server->oplock_credits = server->echo_credits = 0;
  31         switch (server->credits) {
  32         case 0:
  33                 return 0;
  34         case 1:
  35                 server->echoes = false;
  36                 server->oplocks = false;
  37                 break;
  38         case 2:
  39                 server->echoes = true;
  40                 server->oplocks = false;
  41                 server->echo_credits = 1;
  42                 break;
  43         default:
  44                 server->echoes = true;
  45                 if (enable_oplocks) {
  46                         server->oplocks = true;
  47                         server->oplock_credits = 1;
  48                 } else
  49                         server->oplocks = false;
  50
  51                 server->echo_credits = 1;
  52         }
  53         server->credits -= server->echo_credits + server->oplock_credits;
  54         return server->credits + server->echo_credits + server->oplock_credits;
  55 }
  56
  57 static void
  58 smb2_add_credits(struct TCP_Server_Info *server,
  59                  const struct cifs_credits *credits, const int optype)
  60 {
  61         int *val, rc = -1;
  62         unsigned int add = credits->value;
  63         unsigned int instance = credits->instance;
  64         bool reconnect_detected = false;
  65
  66         spin_lock(&server->req_lock);
  67         val = server->ops->get_credits_field(server, optype);
  68
  69         /* eg found case where write overlapping reconnect messed up credits */
  70         if (((optype & CIFS_OP_MASK) == CIFS_NEG_OP) && (*val != 0))
  71                 trace_smb3_reconnect_with_invalid_credits(server->CurrentMid,
  72                         server->hostname, *val);
  73         if ((instance == 0) || (instance == server->reconnect_instance))
  74                 *val += add;
  75         else
  76                 reconnect_detected = true;
  77
  78         if (*val > 65000) {
  79                 *val = 65000; /* Don't get near 64K credits, avoid srv bugs */
  80                 printk_once(KERN_WARNING "server overflowed SMB3 credits\n");
  81         }
  82         server->in_flight--;
  83         if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
  84                 rc = change_conf(server);
  85         /*
  86          * Sometimes server returns 0 credits on oplock break ack - we need to
  87          * rebalance credits in this case.
  88          */
  89         else if (server->in_flight > 0 && server->oplock_credits == 0 &&
  90                  server->oplocks) {
  91                 if (server->credits > 1) {
  92                         server->credits--;
  93                         server->oplock_credits++;
  94                 }
  95         }
  96         spin_unlock(&server->req_lock);
  97         wake_up(&server->request_q);
  98
  99         if (reconnect_detected)
 100                 cifs_dbg(FYI, "trying to put %d credits from the old server instance %d\n",
 101                          add, instance);
 102
 103         if (server->tcpStatus == CifsNeedReconnect
 104             || server->tcpStatus == CifsExiting)
 105                 return;
 106
 107         switch (rc) {
 108         case -1:
 109                 /* change_conf hasn't been executed */
 110                 break;
 111         case 0:
 112                 cifs_server_dbg(VFS, "Possible client or server bug - zero credits\n");
 113                 break;
 114         case 1:
 115                 cifs_server_dbg(VFS, "disabling echoes and oplocks\n");
 116                 break;
 117         case 2:
 118                 cifs_dbg(FYI, "disabling oplocks\n");
 119                 break;
 120         default:
 121                 cifs_dbg(FYI, "add %u credits total=%d\n", add, rc);
 122         }
 123 }
 124
 125 static void
 126 smb2_set_credits(struct TCP_Server_Info *server, const int val)
 127 {
 128         spin_lock(&server->req_lock);
 129         server->credits = val;
 130         if (val == 1)
 131                 server->reconnect_instance++;
 132         spin_unlock(&server->req_lock);
 133         /* don't log while holding the lock */
 134         if (val == 1)
 135                 cifs_dbg(FYI, "set credits to 1 due to smb2 reconnect\n");
 136 }
 137
 138 static int *
 139 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
 140 {
 141         switch (optype) {
 142         case CIFS_ECHO_OP:
 143                 return &server->echo_credits;
 144         case CIFS_OBREAK_OP:
 145                 return &server->oplock_credits;
 146         default:
 147                 return &server->credits;
 148         }
 149 }
 150
 151 static unsigned int
 152 smb2_get_credits(struct mid_q_entry *mid)
 153 {
 154         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)mid->resp_buf;
 155
 156         if (mid->mid_state == MID_RESPONSE_RECEIVED
 157             || mid->mid_state == MID_RESPONSE_MALFORMED)
 158                 return le16_to_cpu(shdr->CreditRequest);
 159
 160         return 0;
 161 }
 162
 163 static int
 164 smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
 165                       unsigned int *num, struct cifs_credits *credits)
 166 {
 167         int rc = 0;
 168         unsigned int scredits;
 169
 170         spin_lock(&server->req_lock);
 171         while (1) {
 172                 if (server->credits <= 0) {
 173                         spin_unlock(&server->req_lock);
 174                         cifs_num_waiters_inc(server);
 175                         rc = wait_event_killable(server->request_q,
 176                                 has_credits(server, &server->credits, 1));
 177                         cifs_num_waiters_dec(server);
 178                         if (rc)
 179                                 return rc;
 180                         spin_lock(&server->req_lock);
 181                 } else {
 182                         if (server->tcpStatus == CifsExiting) {
 183                                 spin_unlock(&server->req_lock);
 184                                 return -ENOENT;
 185                         }
 186
 187                         scredits = server->credits;
 188                         /* can deadlock with reopen */
 189                         if (scredits <= 8) {
 190                                 *num = SMB2_MAX_BUFFER_SIZE;
 191                                 credits->value = 0;
 192                                 credits->instance = 0;
 193                                 break;
 194                         }
 195
 196                         /* leave some credits for reopen and other ops */
 197                         scredits -= 8;
 198                         *num = min_t(unsigned int, size,
 199                                      scredits * SMB2_MAX_BUFFER_SIZE);
 200
 201                         credits->value =
 202                                 DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
 203                         credits->instance = server->reconnect_instance;
 204                         server->credits -= credits->value;
 205                         server->in_flight++;
 206                         if (server->in_flight > server->max_in_flight)
 207                                 server->max_in_flight = server->in_flight;
 208                         break;
 209                 }
 210         }
 211         spin_unlock(&server->req_lock);
 212         return rc;
 213 }
 214
 215 static int
 216 smb2_adjust_credits(struct TCP_Server_Info *server,
 217                     struct cifs_credits *credits,
 218                     const unsigned int payload_size)
 219 {
 220         int new_val = DIV_ROUND_UP(payload_size, SMB2_MAX_BUFFER_SIZE);
 221
 222         if (!credits->value || credits->value == new_val)
 223                 return 0;
 224
 225         if (credits->value < new_val) {
 226                 WARN_ONCE(1, "request has less credits (%d) than required (%d)",
 227                           credits->value, new_val);
 228                 return -ENOTSUPP;
 229         }
 230
 231         spin_lock(&server->req_lock);
 232
 233         if (server->reconnect_instance != credits->instance) {
 234                 spin_unlock(&server->req_lock);
 235                 cifs_server_dbg(VFS, "trying to return %d credits to old session\n",
 236                          credits->value - new_val);
 237                 return -EAGAIN;
 238         }
 239
 240         server->credits += credits->value - new_val;
 241         spin_unlock(&server->req_lock);
 242         wake_up(&server->request_q);
 243         credits->value = new_val;
 244         return 0;
 245 }
 246
 247 static __u64
 248 smb2_get_next_mid(struct TCP_Server_Info *server)
 249 {
 250         __u64 mid;
 251         /* for SMB2 we need the current value */
 252         spin_lock(&GlobalMid_Lock);
 253         mid = server->CurrentMid++;
 254         spin_unlock(&GlobalMid_Lock);
 255         return mid;
 256 }
 257
 258 static void
 259 smb2_revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
 260 {
 261         spin_lock(&GlobalMid_Lock);
 262         if (server->CurrentMid >= val)
 263                 server->CurrentMid -= val;
 264         spin_unlock(&GlobalMid_Lock);
 265 }
 266
 267 static struct mid_q_entry *
 268 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
 269 {
 270         struct mid_q_entry *mid;
 271         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
 272         __u64 wire_mid = le64_to_cpu(shdr->MessageId);
 273
 274         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 275                 cifs_server_dbg(VFS, "Encrypted frame parsing not supported yet\n");
 276                 return NULL;
 277         }
 278
 279         spin_lock(&GlobalMid_Lock);
 280         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 281                 if ((mid->mid == wire_mid) &&
 282                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
 283                     (mid->command == shdr->Command)) {
 284                         kref_get(&mid->refcount);
 285                         spin_unlock(&GlobalMid_Lock);
 286                         return mid;
 287                 }
 288         }
 289         spin_unlock(&GlobalMid_Lock);
 290         return NULL;
 291 }
 292
 293 static void
 294 smb2_dump_detail(void *buf, struct TCP_Server_Info *server)
 295 {
 296 #ifdef CONFIG_CIFS_DEBUG2
 297         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
 298
 299         cifs_server_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
 300                  shdr->Command, shdr->Status, shdr->Flags, shdr->MessageId,
 301                  shdr->ProcessId);
 302         cifs_server_dbg(VFS, "smb buf %p len %u\n", buf,
 303                  server->ops->calc_smb_size(buf, server));
 304 #endif
 305 }
 306
 307 static bool
 308 smb2_need_neg(struct TCP_Server_Info *server)
 309 {
 310         return server->max_read == 0;
 311 }
 312
 313 static int
 314 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 315 {
 316         int rc;
 317
 318         ses->server->CurrentMid = 0;
 319         rc = SMB2_negotiate(xid, ses);
 320         /* BB we probably don't need to retry with modern servers */
 321         if (rc == -EAGAIN)
 322                 rc = -EHOSTDOWN;
 323         return rc;
 324 }
 325
 326 static unsigned int
 327 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 328 {
 329         struct TCP_Server_Info *server = tcon->ses->server;
 330         unsigned int wsize;
 331
 332         /* start with specified wsize, or default */
 333         wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
 334         wsize = min_t(unsigned int, wsize, server->max_write);
 335 #ifdef CONFIG_CIFS_SMB_DIRECT
 336         if (server->rdma) {
 337                 if (server->sign)
 338                         wsize = min_t(unsigned int,
 339                                 wsize, server->smbd_conn->max_fragmented_send_size);
 340                 else
 341                         wsize = min_t(unsigned int,
 342                                 wsize, server->smbd_conn->max_readwrite_size);
 343         }
 344 #endif
 345         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 346                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 347
 348         return wsize;
 349 }
 350
 351 static unsigned int
 352 smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 353 {
 354         struct TCP_Server_Info *server = tcon->ses->server;
 355         unsigned int wsize;
 356
 357         /* start with specified wsize, or default */
 358         wsize = volume_info->wsize ? volume_info->wsize : SMB3_DEFAULT_IOSIZE;
 359         wsize = min_t(unsigned int, wsize, server->max_write);
 360 #ifdef CONFIG_CIFS_SMB_DIRECT
 361         if (server->rdma) {
 362                 if (server->sign)
 363                         wsize = min_t(unsigned int,
 364                                 wsize, server->smbd_conn->max_fragmented_send_size);
 365                 else
 366                         wsize = min_t(unsigned int,
 367                                 wsize, server->smbd_conn->max_readwrite_size);
 368         }
 369 #endif
 370         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 371                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 372
 373         return wsize;
 374 }
 375
 376 static unsigned int
 377 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 378 {
 379         struct TCP_Server_Info *server = tcon->ses->server;
 380         unsigned int rsize;
 381
 382         /* start with specified rsize, or default */
 383         rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
 384         rsize = min_t(unsigned int, rsize, server->max_read);
 385 #ifdef CONFIG_CIFS_SMB_DIRECT
 386         if (server->rdma) {
 387                 if (server->sign)
 388                         rsize = min_t(unsigned int,
 389                                 rsize, server->smbd_conn->max_fragmented_recv_size);
 390                 else
 391                         rsize = min_t(unsigned int,
 392                                 rsize, server->smbd_conn->max_readwrite_size);
 393         }
 394 #endif
 395
 396         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 397                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 398
 399         return rsize;
 400 }
 401
 402 static unsigned int
 403 smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 404 {
 405         struct TCP_Server_Info *server = tcon->ses->server;
 406         unsigned int rsize;
 407
 408         /* start with specified rsize, or default */
 409         rsize = volume_info->rsize ? volume_info->rsize : SMB3_DEFAULT_IOSIZE;
 410         rsize = min_t(unsigned int, rsize, server->max_read);
 411 #ifdef CONFIG_CIFS_SMB_DIRECT
 412         if (server->rdma) {
 413                 if (server->sign)
 414                         rsize = min_t(unsigned int,
 415                                 rsize, server->smbd_conn->max_fragmented_recv_size);
 416                 else
 417                         rsize = min_t(unsigned int,
 418                                 rsize, server->smbd_conn->max_readwrite_size);
 419         }
 420 #endif
 421
 422         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 423                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 424
 425         return rsize;
 426 }
 427
 428 static int
 429 parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
 430                         size_t buf_len,
 431                         struct cifs_server_iface **iface_list,
 432                         size_t *iface_count)
 433 {
 434         struct network_interface_info_ioctl_rsp *p;
 435         struct sockaddr_in *addr4;
 436         struct sockaddr_in6 *addr6;
 437         struct iface_info_ipv4 *p4;
 438         struct iface_info_ipv6 *p6;
 439         struct cifs_server_iface *info;
 440         ssize_t bytes_left;
 441         size_t next = 0;
 442         int nb_iface = 0;
 443         int rc = 0;
 444
 445         *iface_list = NULL;
 446         *iface_count = 0;
 447
 448         /*
 449          * Fist pass: count and sanity check
 450          */
 451
 452         bytes_left = buf_len;
 453         p = buf;
 454         while (bytes_left >= sizeof(*p)) {
 455                 nb_iface++;
 456                 next = le32_to_cpu(p->Next);
 457                 if (!next) {
 458                         bytes_left -= sizeof(*p);
 459                         break;
 460                 }
 461                 p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
 462                 bytes_left -= next;
 463         }
 464
 465         if (!nb_iface) {
 466                 cifs_dbg(VFS, "%s: malformed interface info\n", __func__);
 467                 rc = -EINVAL;
 468                 goto out;
 469         }
 470
 471         if (bytes_left || p->Next)
 472                 cifs_dbg(VFS, "%s: incomplete interface info\n", __func__);
 473
 474
 475         /*
 476          * Second pass: extract info to internal structure
 477          */
 478
 479         *iface_list = kcalloc(nb_iface, sizeof(**iface_list), GFP_KERNEL);
 480         if (!*iface_list) {
 481                 rc = -ENOMEM;
 482                 goto out;
 483         }
 484
 485         info = *iface_list;
 486         bytes_left = buf_len;
 487         p = buf;
 488         while (bytes_left >= sizeof(*p)) {
 489                 info->speed = le64_to_cpu(p->LinkSpeed);
 490                 info->rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE);
 491                 info->rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE);
 492
 493                 cifs_dbg(FYI, "%s: adding iface %zu\n", __func__, *iface_count);
 494                 cifs_dbg(FYI, "%s: speed %zu bps\n", __func__, info->speed);
 495                 cifs_dbg(FYI, "%s: capabilities 0x%08x\n", __func__,
 496                          le32_to_cpu(p->Capability));
 497
 498                 switch (p->Family) {
 499                 /*
 500                  * The kernel and wire socket structures have the same
 501                  * layout and use network byte order but make the
 502                  * conversion explicit in case either one changes.
 503                  */
 504                 case INTERNETWORK:
 505                         addr4 = (struct sockaddr_in *)&info->sockaddr;
 506                         p4 = (struct iface_info_ipv4 *)p->Buffer;
 507                         addr4->sin_family = AF_INET;
 508                         memcpy(&addr4->sin_addr, &p4->IPv4Address, 4);
 509
 510                         /* [MS-SMB2] 2.2.32.5.1.1 Clients MUST ignore these */
 511                         addr4->sin_port = cpu_to_be16(CIFS_PORT);
 512
 513                         cifs_dbg(FYI, "%s: ipv4 %pI4\n", __func__,
 514                                  &addr4->sin_addr);
 515                         break;
 516                 case INTERNETWORKV6:
 517                         addr6 = (struct sockaddr_in6 *)&info->sockaddr;
 518                         p6 = (struct iface_info_ipv6 *)p->Buffer;
 519                         addr6->sin6_family = AF_INET6;
 520                         memcpy(&addr6->sin6_addr, &p6->IPv6Address, 16);
 521
 522                         /* [MS-SMB2] 2.2.32.5.1.2 Clients MUST ignore these */
 523                         addr6->sin6_flowinfo = 0;
 524                         addr6->sin6_scope_id = 0;
 525                         addr6->sin6_port = cpu_to_be16(CIFS_PORT);
 526
 527                         cifs_dbg(FYI, "%s: ipv6 %pI6\n", __func__,
 528                                  &addr6->sin6_addr);
 529                         break;
 530                 default:
 531                         cifs_dbg(VFS,
 532                                  "%s: skipping unsupported socket family\n",
 533                                  __func__);
 534                         goto next_iface;
 535                 }
 536
 537                 (*iface_count)++;
 538                 info++;
 539 next_iface:
 540                 next = le32_to_cpu(p->Next);
 541                 if (!next)
 542                         break;
 543                 p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
 544                 bytes_left -= next;
 545         }
 546
 547         if (!*iface_count) {
 548                 rc = -EINVAL;
 549                 goto out;
 550         }
 551
 552 out:
 553         if (rc) {
 554                 kfree(*iface_list);
 555                 *iface_count = 0;
 556                 *iface_list = NULL;
 557         }
 558         return rc;
 559 }
 560
 561
 562 static int
 563 SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
 564 {
 565         int rc;
 566         unsigned int ret_data_len = 0;
 567         struct network_interface_info_ioctl_rsp *out_buf = NULL;
 568         struct cifs_server_iface *iface_list;
 569         size_t iface_count;
 570         struct cifs_ses *ses = tcon->ses;
 571
 572         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 573                         FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
 574                         NULL /* no data input */, 0 /* no data input */,
 575                         CIFSMaxBufSize, (char **)&out_buf, &ret_data_len);
 576         if (rc == -EOPNOTSUPP) {
 577                 cifs_dbg(FYI,
 578                          "server does not support query network interfaces\n");
 579                 goto out;
 580         } else if (rc != 0) {
 581                 cifs_tcon_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
 582                 goto out;
 583         }
 584
 585         rc = parse_server_interfaces(out_buf, ret_data_len,
 586                                      &iface_list, &iface_count);
 587         if (rc)
 588                 goto out;
 589
 590         spin_lock(&ses->iface_lock);
 591         kfree(ses->iface_list);
 592         ses->iface_list = iface_list;
 593         ses->iface_count = iface_count;
 594         ses->iface_last_update = jiffies;
 595         spin_unlock(&ses->iface_lock);
 596
 597 out:
 598         kfree(out_buf);
 599         return rc;
 600 }
 601
 602 static void
 603 smb2_close_cached_fid(struct kref *ref)
 604 {
 605         struct cached_fid *cfid = container_of(ref, struct cached_fid,
 606                                                refcount);
 607
 608         if (cfid->is_valid) {
 609                 cifs_dbg(FYI, "clear cached root file handle\n");
 610                 SMB2_close(0, cfid->tcon, cfid->fid->persistent_fid,
 611                            cfid->fid->volatile_fid);
 612                 cfid->is_valid = false;
 613                 cfid->file_all_info_is_valid = false;
 614         }
 615 }
 616
 617 void close_shroot(struct cached_fid *cfid)
 618 {
 619         mutex_lock(&cfid->fid_mutex);
 620         kref_put(&cfid->refcount, smb2_close_cached_fid);
 621         mutex_unlock(&cfid->fid_mutex);
 622 }
 623
 624 void
 625 smb2_cached_lease_break(struct work_struct *work)
 626 {
 627         struct cached_fid *cfid = container_of(work,
 628                                 struct cached_fid, lease_break);
 629
 630         close_shroot(cfid);
 631 }
 632
 633 /*
 634  * Open the directory at the root of a share
 635  */
 636 int open_shroot(unsigned int xid, struct cifs_tcon *tcon, struct cifs_fid *pfid)
 637 {
 638         struct cifs_ses *ses = tcon->ses;
 639         struct TCP_Server_Info *server = ses->server;
 640         struct cifs_open_parms oparms;
 641         struct smb2_create_rsp *o_rsp = NULL;
 642         struct smb2_query_info_rsp *qi_rsp = NULL;
 643         int resp_buftype[2];
 644         struct smb_rqst rqst[2];
 645         struct kvec rsp_iov[2];
 646         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
 647         struct kvec qi_iov[1];
 648         int rc, flags = 0;
 649         __le16 utf16_path = 0; /* Null - since an open of top of share */
 650         u8 oplock = SMB2_OPLOCK_LEVEL_II;
 651
 652         mutex_lock(&tcon->crfid.fid_mutex);
 653         if (tcon->crfid.is_valid) {
 654                 cifs_dbg(FYI, "found a cached root file handle\n");
 655                 memcpy(pfid, tcon->crfid.fid, sizeof(struct cifs_fid));
 656                 kref_get(&tcon->crfid.refcount);
 657                 mutex_unlock(&tcon->crfid.fid_mutex);
 658                 return 0;
 659         }
 660
 661         /*
 662          * We do not hold the lock for the open because in case
 663          * SMB2_open needs to reconnect, it will end up calling
 664          * cifs_mark_open_files_invalid() which takes the lock again
 665          * thus causing a deadlock
 666          */
 667
 668         mutex_unlock(&tcon->crfid.fid_mutex);
 669
 670         if (smb3_encryption_required(tcon))
 671                 flags |= CIFS_TRANSFORM_REQ;
 672
 673         memset(rqst, 0, sizeof(rqst));
 674         resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
 675         memset(rsp_iov, 0, sizeof(rsp_iov));
 676
 677         /* Open */
 678         memset(&open_iov, 0, sizeof(open_iov));
 679         rqst[0].rq_iov = open_iov;
 680         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
 681
 682         oparms.tcon = tcon;
 683         oparms.create_options = 0;
 684         oparms.desired_access = FILE_READ_ATTRIBUTES;
 685         oparms.disposition = FILE_OPEN;
 686         oparms.fid = pfid;
 687         oparms.reconnect = false;
 688
 689         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, &utf16_path);
 690         if (rc)
 691                 goto oshr_free;
 692         smb2_set_next_command(tcon, &rqst[0]);
 693
 694         memset(&qi_iov, 0, sizeof(qi_iov));
 695         rqst[1].rq_iov = qi_iov;
 696         rqst[1].rq_nvec = 1;
 697
 698         rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID,
 699                                   COMPOUND_FID, FILE_ALL_INFORMATION,
 700                                   SMB2_O_INFO_FILE, 0,
 701                                   sizeof(struct smb2_file_all_info) +
 702                                   PATH_MAX * 2, 0, NULL);
 703         if (rc)
 704                 goto oshr_free;
 705
 706         smb2_set_related(&rqst[1]);
 707
 708         rc = compound_send_recv(xid, ses, flags, 2, rqst,
 709                                 resp_buftype, rsp_iov);
 710         mutex_lock(&tcon->crfid.fid_mutex);
 711
 712         /*
 713          * Now we need to check again as the cached root might have
 714          * been successfully re-opened from a concurrent process
 715          */
 716
 717         if (tcon->crfid.is_valid) {
 718                 /* work was already done */
 719
 720                 /* stash fids for close() later */
 721                 struct cifs_fid fid = {
 722                         .persistent_fid = pfid->persistent_fid,
 723                         .volatile_fid = pfid->volatile_fid,
 724                 };
 725
 726                 /*
 727                  * caller expects this func to set pfid to a valid
 728                  * cached root, so we copy the existing one and get a
 729                  * reference.
 730                  */
 731                 memcpy(pfid, tcon->crfid.fid, sizeof(*pfid));
 732                 kref_get(&tcon->crfid.refcount);
 733
 734                 mutex_unlock(&tcon->crfid.fid_mutex);
 735
 736                 if (rc == 0) {
 737                         /* close extra handle outside of crit sec */
 738                         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 739                 }
 740                 goto oshr_free;
 741         }
 742
 743         /* Cached root is still invalid, continue normaly */
 744
 745         if (rc) {
 746                 if (rc == -EREMCHG) {
 747                         tcon->need_reconnect = true;
 748                         printk_once(KERN_WARNING "server share %s deleted\n",
 749                                     tcon->treeName);
 750                 }
 751                 goto oshr_exit;
 752         }
 753
 754         atomic_inc(&tcon->num_remote_opens);
 755
 756         o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
 757         oparms.fid->persistent_fid = o_rsp->PersistentFileId;
 758         oparms.fid->volatile_fid = o_rsp->VolatileFileId;
 759 #ifdef CONFIG_CIFS_DEBUG2
 760         oparms.fid->mid = le64_to_cpu(o_rsp->sync_hdr.MessageId);
 761 #endif /* CIFS_DEBUG2 */
 762
 763         memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid));
 764         tcon->crfid.tcon = tcon;
 765         tcon->crfid.is_valid = true;
 766         kref_init(&tcon->crfid.refcount);
 767
 768         /* BB TBD check to see if oplock level check can be removed below */
 769         if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) {
 770                 kref_get(&tcon->crfid.refcount);
 771                 smb2_parse_contexts(server, o_rsp,
 772                                 &oparms.fid->epoch,
 773                                 oparms.fid->lease_key, &oplock, NULL);
 774         } else
 775                 goto oshr_exit;
 776
 777         qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
 778         if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info))
 779                 goto oshr_exit;
 780         if (!smb2_validate_and_copy_iov(
 781                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 782                                 sizeof(struct smb2_file_all_info),
 783                                 &rsp_iov[1], sizeof(struct smb2_file_all_info),
 784                                 (char *)&tcon->crfid.file_all_info))
 785                 tcon->crfid.file_all_info_is_valid = 1;
 786
 787 oshr_exit:
 788         mutex_unlock(&tcon->crfid.fid_mutex);
 789 oshr_free:
 790         SMB2_open_free(&rqst[0]);
 791         SMB2_query_info_free(&rqst[1]);
 792         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 793         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 794         return rc;
 795 }
 796
 797 static void
 798 smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 799 {
 800         int rc;
 801         __le16 srch_path = 0; /* Null - open root of share */
 802         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 803         struct cifs_open_parms oparms;
 804         struct cifs_fid fid;
 805         bool no_cached_open = tcon->nohandlecache;
 806
 807         oparms.tcon = tcon;
 808         oparms.desired_access = FILE_READ_ATTRIBUTES;
 809         oparms.disposition = FILE_OPEN;
 810         oparms.create_options = 0;
 811         oparms.fid = &fid;
 812         oparms.reconnect = false;
 813
 814         if (no_cached_open)
 815                 rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
 816                                NULL);
 817         else
 818                 rc = open_shroot(xid, tcon, &fid);
 819
 820         if (rc)
 821                 return;
 822
 823         SMB3_request_interfaces(xid, tcon);
 824
 825         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 826                         FS_ATTRIBUTE_INFORMATION);
 827         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 828                         FS_DEVICE_INFORMATION);
 829         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 830                         FS_VOLUME_INFORMATION);
 831         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 832                         FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
 833         if (no_cached_open)
 834                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 835         else
 836                 close_shroot(&tcon->crfid);
 837 }
 838
 839 static void
 840 smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 841 {
 842         int rc;
 843         __le16 srch_path = 0; /* Null - open root of share */
 844         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 845         struct cifs_open_parms oparms;
 846         struct cifs_fid fid;
 847
 848         oparms.tcon = tcon;
 849         oparms.desired_access = FILE_READ_ATTRIBUTES;
 850         oparms.disposition = FILE_OPEN;
 851         oparms.create_options = 0;
 852         oparms.fid = &fid;
 853         oparms.reconnect = false;
 854
 855         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL, NULL);
 856         if (rc)
 857                 return;
 858
 859         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 860                         FS_ATTRIBUTE_INFORMATION);
 861         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 862                         FS_DEVICE_INFORMATION);
 863         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 864 }
 865
 866 static int
 867 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 868                         struct cifs_sb_info *cifs_sb, const char *full_path)
 869 {
 870         int rc;
 871         __le16 *utf16_path;
 872         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 873         struct cifs_open_parms oparms;
 874         struct cifs_fid fid;
 875
 876         if ((*full_path == 0) && tcon->crfid.is_valid)
 877                 return 0;
 878
 879         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 880         if (!utf16_path)
 881                 return -ENOMEM;
 882
 883         oparms.tcon = tcon;
 884         oparms.desired_access = FILE_READ_ATTRIBUTES;
 885         oparms.disposition = FILE_OPEN;
 886         if (backup_cred(cifs_sb))
 887                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
 888         else
 889                 oparms.create_options = 0;
 890         oparms.fid = &fid;
 891         oparms.reconnect = false;
 892
 893         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
 894         if (rc) {
 895                 kfree(utf16_path);
 896                 return rc;
 897         }
 898
 899         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 900         kfree(utf16_path);
 901         return rc;
 902 }
 903
 904 static int
 905 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 906                   struct cifs_sb_info *cifs_sb, const char *full_path,
 907                   u64 *uniqueid, FILE_ALL_INFO *data)
 908 {
 909         *uniqueid = le64_to_cpu(data->IndexNumber);
 910         return 0;
 911 }
 912
 913 static int
 914 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 915                      struct cifs_fid *fid, FILE_ALL_INFO *data)
 916 {
 917         int rc;
 918         struct smb2_file_all_info *smb2_data;
 919
 920         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 921                             GFP_KERNEL);
 922         if (smb2_data == NULL)
 923                 return -ENOMEM;
 924
 925         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
 926                              smb2_data);
 927         if (!rc)
 928                 move_smb2_info_to_cifs(data, smb2_data);
 929         kfree(smb2_data);
 930         return rc;
 931 }
 932
 933 #ifdef CONFIG_CIFS_XATTR
 934 static ssize_t
 935 move_smb2_ea_to_cifs(char *dst, size_t dst_size,
 936                      struct smb2_file_full_ea_info *src, size_t src_size,
 937                      const unsigned char *ea_name)
 938 {
 939         int rc = 0;
 940         unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0;
 941         char *name, *value;
 942         size_t buf_size = dst_size;
 943         size_t name_len, value_len, user_name_len;
 944
 945         while (src_size > 0) {
 946                 name = &src->ea_data[0];
 947                 name_len = (size_t)src->ea_name_length;
 948                 value = &src->ea_data[src->ea_name_length + 1];
 949                 value_len = (size_t)le16_to_cpu(src->ea_value_length);
 950
 951                 if (name_len == 0)
 952                         break;
 953
 954                 if (src_size < 8 + name_len + 1 + value_len) {
 955                         cifs_dbg(FYI, "EA entry goes beyond length of list\n");
 956                         rc = -EIO;
 957                         goto out;
 958                 }
 959
 960                 if (ea_name) {
 961                         if (ea_name_len == name_len &&
 962                             memcmp(ea_name, name, name_len) == 0) {
 963                                 rc = value_len;
 964                                 if (dst_size == 0)
 965                                         goto out;
 966                                 if (dst_size < value_len) {
 967                                         rc = -ERANGE;
 968                                         goto out;
 969                                 }
 970                                 memcpy(dst, value, value_len);
 971                                 goto out;
 972                         }
 973                 } else {
 974                         /* 'user.' plus a terminating null */
 975                         user_name_len = 5 + 1 + name_len;
 976
 977                         if (buf_size == 0) {
 978                                 /* skip copy - calc size only */
 979                                 rc += user_name_len;
 980                         } else if (dst_size >= user_name_len) {
 981                                 dst_size -= user_name_len;
 982                                 memcpy(dst, "user.", 5);
 983                                 dst += 5;
 984                                 memcpy(dst, src->ea_data, name_len);
 985                                 dst += name_len;
 986                                 *dst = 0;
 987                                 ++dst;
 988                                 rc += user_name_len;
 989                         } else {
 990                                 /* stop before overrun buffer */
 991                                 rc = -ERANGE;
 992                                 break;
 993                         }
 994                 }
 995
 996                 if (!src->next_entry_offset)
 997                         break;
 998
 999                 if (src_size < le32_to_cpu(src->next_entry_offset)) {
1000                         /* stop before overrun buffer */
1001                         rc = -ERANGE;
1002                         break;
1003                 }
1004                 src_size -= le32_to_cpu(src->next_entry_offset);
1005                 src = (void *)((char *)src +
1006                                le32_to_cpu(src->next_entry_offset));
1007         }
1008
1009         /* didn't find the named attribute */
1010         if (ea_name)
1011                 rc = -ENODATA;
1012
1013 out:
1014         return (ssize_t)rc;
1015 }
1016
1017 static ssize_t
1018 smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
1019                const unsigned char *path, const unsigned char *ea_name,
1020                char *ea_data, size_t buf_size,
1021                struct cifs_sb_info *cifs_sb)
1022 {
1023         int rc;
1024         __le16 *utf16_path;
1025         struct kvec rsp_iov = {NULL, 0};
1026         int buftype = CIFS_NO_BUFFER;
1027         struct smb2_query_info_rsp *rsp;
1028         struct smb2_file_full_ea_info *info = NULL;
1029
1030         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1031         if (!utf16_path)
1032                 return -ENOMEM;
1033
1034         rc = smb2_query_info_compound(xid, tcon, utf16_path,
1035                                       FILE_READ_EA,
1036                                       FILE_FULL_EA_INFORMATION,
1037                                       SMB2_O_INFO_FILE,
1038                                       CIFSMaxBufSize -
1039                                       MAX_SMB2_CREATE_RESPONSE_SIZE -
1040                                       MAX_SMB2_CLOSE_RESPONSE_SIZE,
1041                                       &rsp_iov, &buftype, cifs_sb);
1042         if (rc) {
1043                 /*
1044                  * If ea_name is NULL (listxattr) and there are no EAs,
1045                  * return 0 as it's not an error. Otherwise, the specified
1046                  * ea_name was not found.
1047                  */
1048                 if (!ea_name && rc == -ENODATA)
1049                         rc = 0;
1050                 goto qeas_exit;
1051         }
1052
1053         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
1054         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
1055                                le32_to_cpu(rsp->OutputBufferLength),
1056                                &rsp_iov,
1057                                sizeof(struct smb2_file_full_ea_info));
1058         if (rc)
1059                 goto qeas_exit;
1060
1061         info = (struct smb2_file_full_ea_info *)(
1062                         le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
1063         rc = move_smb2_ea_to_cifs(ea_data, buf_size, info,
1064                         le32_to_cpu(rsp->OutputBufferLength), ea_name);
1065
1066  qeas_exit:
1067         kfree(utf16_path);
1068         free_rsp_buf(buftype, rsp_iov.iov_base);
1069         return rc;
1070 }
1071
1072
1073 static int
1074 smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
1075             const char *path, const char *ea_name, const void *ea_value,
1076             const __u16 ea_value_len, const struct nls_table *nls_codepage,
1077             struct cifs_sb_info *cifs_sb)
1078 {
1079         struct cifs_ses *ses = tcon->ses;
1080         __le16 *utf16_path = NULL;
1081         int ea_name_len = strlen(ea_name);
1082         int flags = 0;
1083         int len;
1084         struct smb_rqst rqst[3];
1085         int resp_buftype[3];
1086         struct kvec rsp_iov[3];
1087         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1088         struct cifs_open_parms oparms;
1089         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1090         struct cifs_fid fid;
1091         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
1092         unsigned int size[1];
1093         void *data[1];
1094         struct smb2_file_full_ea_info *ea = NULL;
1095         struct kvec close_iov[1];
1096         int rc;
1097
1098         if (smb3_encryption_required(tcon))
1099                 flags |= CIFS_TRANSFORM_REQ;
1100
1101         if (ea_name_len > 255)
1102                 return -EINVAL;
1103
1104         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1105         if (!utf16_path)
1106                 return -ENOMEM;
1107
1108         memset(rqst, 0, sizeof(rqst));
1109         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1110         memset(rsp_iov, 0, sizeof(rsp_iov));
1111
1112         if (ses->server->ops->query_all_EAs) {
1113                 if (!ea_value) {
1114                         rc = ses->server->ops->query_all_EAs(xid, tcon, path,
1115                                                              ea_name, NULL, 0,
1116                                                              cifs_sb);
1117                         if (rc == -ENODATA)
1118                                 goto sea_exit;
1119                 }
1120         }
1121
1122         /* Open */
1123         memset(&open_iov, 0, sizeof(open_iov));
1124         rqst[0].rq_iov = open_iov;
1125         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1126
1127         memset(&oparms, 0, sizeof(oparms));
1128         oparms.tcon = tcon;
1129         oparms.desired_access = FILE_WRITE_EA;
1130         oparms.disposition = FILE_OPEN;
1131         if (backup_cred(cifs_sb))
1132                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1133         else
1134                 oparms.create_options = 0;
1135         oparms.fid = &fid;
1136         oparms.reconnect = false;
1137
1138         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path);
1139         if (rc)
1140                 goto sea_exit;
1141         smb2_set_next_command(tcon, &rqst[0]);
1142
1143
1144         /* Set Info */
1145         memset(&si_iov, 0, sizeof(si_iov));
1146         rqst[1].rq_iov = si_iov;
1147         rqst[1].rq_nvec = 1;
1148
1149         len = sizeof(ea) + ea_name_len + ea_value_len + 1;
1150         ea = kzalloc(len, GFP_KERNEL);
1151         if (ea == NULL) {
1152                 rc = -ENOMEM;
1153                 goto sea_exit;
1154         }
1155
1156         ea->ea_name_length = ea_name_len;
1157         ea->ea_value_length = cpu_to_le16(ea_value_len);
1158         memcpy(ea->ea_data, ea_name, ea_name_len + 1);
1159         memcpy(ea->ea_data + ea_name_len + 1, ea_value, ea_value_len);
1160
1161         size[0] = len;
1162         data[0] = ea;
1163
1164         rc = SMB2_set_info_init(tcon, &rqst[1], COMPOUND_FID,
1165                                 COMPOUND_FID, current->tgid,
1166                                 FILE_FULL_EA_INFORMATION,
1167                                 SMB2_O_INFO_FILE, 0, data, size);
1168         smb2_set_next_command(tcon, &rqst[1]);
1169         smb2_set_related(&rqst[1]);
1170
1171
1172         /* Close */
1173         memset(&close_iov, 0, sizeof(close_iov));
1174         rqst[2].rq_iov = close_iov;
1175         rqst[2].rq_nvec = 1;
1176         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
1177         smb2_set_related(&rqst[2]);
1178
1179         rc = compound_send_recv(xid, ses, flags, 3, rqst,
1180                                 resp_buftype, rsp_iov);
1181         /* no need to bump num_remote_opens because handle immediately closed */
1182
1183  sea_exit:
1184         kfree(ea);
1185         kfree(utf16_path);
1186         SMB2_open_free(&rqst[0]);
1187         SMB2_set_info_free(&rqst[1]);
1188         SMB2_close_free(&rqst[2]);
1189         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1190         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1191         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1192         return rc;
1193 }
1194 #endif
1195
1196 static bool
1197 smb2_can_echo(struct TCP_Server_Info *server)
1198 {
1199         return server->echoes;
1200 }
1201
1202 static void
1203 smb2_clear_stats(struct cifs_tcon *tcon)
1204 {
1205         int i;
1206
1207         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
1208                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
1209                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
1210         }
1211 }
1212
1213 static void
1214 smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
1215 {
1216         seq_puts(m, "\n\tShare Capabilities:");
1217         if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
1218                 seq_puts(m, " DFS,");
1219         if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
1220                 seq_puts(m, " CONTINUOUS AVAILABILITY,");
1221         if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
1222                 seq_puts(m, " SCALEOUT,");
1223         if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
1224                 seq_puts(m, " CLUSTER,");
1225         if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
1226                 seq_puts(m, " ASYMMETRIC,");
1227         if (tcon->capabilities == 0)
1228                 seq_puts(m, " None");
1229         if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
1230                 seq_puts(m, " Aligned,");
1231         if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
1232                 seq_puts(m, " Partition Aligned,");
1233         if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
1234                 seq_puts(m, " SSD,");
1235         if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
1236                 seq_puts(m, " TRIM-support,");
1237
1238         seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
1239         seq_printf(m, "\n\ttid: 0x%x", tcon->tid);
1240         if (tcon->perf_sector_size)
1241                 seq_printf(m, "\tOptimal sector size: 0x%x",
1242                            tcon->perf_sector_size);
1243         seq_printf(m, "\tMaximal Access: 0x%x", tcon->maximal_access);
1244 }
1245
1246 static void
1247 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
1248 {
1249         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
1250         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
1251
1252         /*
1253          *  Can't display SMB2_NEGOTIATE, SESSION_SETUP, LOGOFF, CANCEL and ECHO
1254          *  totals (requests sent) since those SMBs are per-session not per tcon
1255          */
1256         seq_printf(m, "\nBytes read: %llu  Bytes written: %llu",
1257                    (long long)(tcon->bytes_read),
1258                    (long long)(tcon->bytes_written));
1259         seq_printf(m, "\nOpen files: %d total (local), %d open on server",
1260                    atomic_read(&tcon->num_local_opens),
1261                    atomic_read(&tcon->num_remote_opens));
1262         seq_printf(m, "\nTreeConnects: %d total %d failed",
1263                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
1264                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
1265         seq_printf(m, "\nTreeDisconnects: %d total %d failed",
1266                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
1267                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
1268         seq_printf(m, "\nCreates: %d total %d failed",
1269                    atomic_read(&sent[SMB2_CREATE_HE]),
1270                    atomic_read(&failed[SMB2_CREATE_HE]));
1271         seq_printf(m, "\nCloses: %d total %d failed",
1272                    atomic_read(&sent[SMB2_CLOSE_HE]),
1273                    atomic_read(&failed[SMB2_CLOSE_HE]));
1274         seq_printf(m, "\nFlushes: %d total %d failed",
1275                    atomic_read(&sent[SMB2_FLUSH_HE]),
1276                    atomic_read(&failed[SMB2_FLUSH_HE]));
1277         seq_printf(m, "\nReads: %d total %d failed",
1278                    atomic_read(&sent[SMB2_READ_HE]),
1279                    atomic_read(&failed[SMB2_READ_HE]));
1280         seq_printf(m, "\nWrites: %d total %d failed",
1281                    atomic_read(&sent[SMB2_WRITE_HE]),
1282                    atomic_read(&failed[SMB2_WRITE_HE]));
1283         seq_printf(m, "\nLocks: %d total %d failed",
1284                    atomic_read(&sent[SMB2_LOCK_HE]),
1285                    atomic_read(&failed[SMB2_LOCK_HE]));
1286         seq_printf(m, "\nIOCTLs: %d total %d failed",
1287                    atomic_read(&sent[SMB2_IOCTL_HE]),
1288                    atomic_read(&failed[SMB2_IOCTL_HE]));
1289         seq_printf(m, "\nQueryDirectories: %d total %d failed",
1290                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
1291                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
1292         seq_printf(m, "\nChangeNotifies: %d total %d failed",
1293                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
1294                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
1295         seq_printf(m, "\nQueryInfos: %d total %d failed",
1296                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
1297                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
1298         seq_printf(m, "\nSetInfos: %d total %d failed",
1299                    atomic_read(&sent[SMB2_SET_INFO_HE]),
1300                    atomic_read(&failed[SMB2_SET_INFO_HE]));
1301         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
1302                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
1303                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
1304 }
1305
1306 static void
1307 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
1308 {
1309         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
1310         struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
1311
1312         cfile->fid.persistent_fid = fid->persistent_fid;
1313         cfile->fid.volatile_fid = fid->volatile_fid;
1314 #ifdef CONFIG_CIFS_DEBUG2
1315         cfile->fid.mid = fid->mid;
1316 #endif /* CIFS_DEBUG2 */
1317         server->ops->set_oplock_level(cinode, oplock, fid->epoch,
1318                                       &fid->purge_cache);
1319         cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
1320         memcpy(cfile->fid.create_guid, fid->create_guid, 16);
1321 }
1322
1323 static void
1324 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
1325                 struct cifs_fid *fid)
1326 {
1327         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1328 }
1329
1330 static int
1331 SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
1332                      u64 persistent_fid, u64 volatile_fid,
1333                      struct copychunk_ioctl *pcchunk)
1334 {
1335         int rc;
1336         unsigned int ret_data_len;
1337         struct resume_key_req *res_key;
1338
1339         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1340                         FSCTL_SRV_REQUEST_RESUME_KEY, true /* is_fsctl */,
1341                         NULL, 0 /* no input */, CIFSMaxBufSize,
1342                         (char **)&res_key, &ret_data_len);
1343
1344         if (rc) {
1345                 cifs_tcon_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
1346                 goto req_res_key_exit;
1347         }
1348         if (ret_data_len < sizeof(struct resume_key_req)) {
1349                 cifs_tcon_dbg(VFS, "Invalid refcopy resume key length\n");
1350                 rc = -EINVAL;
1351                 goto req_res_key_exit;
1352         }
1353         memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
1354
1355 req_res_key_exit:
1356         kfree(res_key);
1357         return rc;
1358 }
1359
1360 static int
1361 smb2_ioctl_query_info(const unsigned int xid,
1362                       struct cifs_tcon *tcon,
1363                       __le16 *path, int is_dir,
1364                       unsigned long p)
1365 {
1366         struct cifs_ses *ses = tcon->ses;
1367         char __user *arg = (char __user *)p;
1368         struct smb_query_info qi;
1369         struct smb_query_info __user *pqi;
1370         int rc = 0;
1371         int flags = 0;
1372         struct smb2_query_info_rsp *qi_rsp = NULL;
1373         struct smb2_ioctl_rsp *io_rsp = NULL;
1374         void *buffer = NULL;
1375         struct smb_rqst rqst[3];
1376         int resp_buftype[3];
1377         struct kvec rsp_iov[3];
1378         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1379         struct cifs_open_parms oparms;
1380         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1381         struct cifs_fid fid;
1382         struct kvec qi_iov[1];
1383         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
1384         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
1385         struct kvec close_iov[1];
1386         unsigned int size[2];
1387         void *data[2];
1388
1389         memset(rqst, 0, sizeof(rqst));
1390         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1391         memset(rsp_iov, 0, sizeof(rsp_iov));
1392
1393         if (copy_from_user(&qi, arg, sizeof(struct smb_query_info)))
1394                 return -EFAULT;
1395
1396         if (qi.output_buffer_length > 1024)
1397                 return -EINVAL;
1398
1399         if (!ses || !(ses->server))
1400                 return -EIO;
1401
1402         if (smb3_encryption_required(tcon))
1403                 flags |= CIFS_TRANSFORM_REQ;
1404
1405         buffer = kmalloc(qi.output_buffer_length, GFP_KERNEL);
1406         if (buffer == NULL)
1407                 return -ENOMEM;
1408
1409         if (copy_from_user(buffer, arg + sizeof(struct smb_query_info),
1410                            qi.output_buffer_length)) {
1411                 rc = -EFAULT;
1412                 goto iqinf_exit;
1413         }
1414
1415         /* Open */
1416         memset(&open_iov, 0, sizeof(open_iov));
1417         rqst[0].rq_iov = open_iov;
1418         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1419
1420         memset(&oparms, 0, sizeof(oparms));
1421         oparms.tcon = tcon;
1422         oparms.disposition = FILE_OPEN;
1423         if (is_dir)
1424                 oparms.create_options = CREATE_NOT_FILE;
1425         else
1426                 oparms.create_options = CREATE_NOT_DIR;
1427         oparms.fid = &fid;
1428         oparms.reconnect = false;
1429
1430         if (qi.flags & PASSTHRU_FSCTL) {
1431                 switch (qi.info_type & FSCTL_DEVICE_ACCESS_MASK) {
1432                 case FSCTL_DEVICE_ACCESS_FILE_READ_WRITE_ACCESS:
1433                         oparms.desired_access = FILE_READ_DATA | FILE_WRITE_DATA | FILE_READ_ATTRIBUTES | SYNCHRONIZE;
1434                         break;
1435                 case FSCTL_DEVICE_ACCESS_FILE_ANY_ACCESS:
1436                         oparms.desired_access = GENERIC_ALL;
1437                         break;
1438                 case FSCTL_DEVICE_ACCESS_FILE_READ_ACCESS:
1439                         oparms.desired_access = GENERIC_READ;
1440                         break;
1441                 case FSCTL_DEVICE_ACCESS_FILE_WRITE_ACCESS:
1442                         oparms.desired_access = GENERIC_WRITE;
1443                         break;
1444                 }
1445         } else if (qi.flags & PASSTHRU_SET_INFO) {
1446                 oparms.desired_access = GENERIC_WRITE;
1447         } else {
1448                 oparms.desired_access = FILE_READ_ATTRIBUTES | READ_CONTROL;
1449         }
1450
1451         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, path);
1452         if (rc)
1453                 goto iqinf_exit;
1454         smb2_set_next_command(tcon, &rqst[0]);
1455
1456         /* Query */
1457         if (qi.flags & PASSTHRU_FSCTL) {
1458                 /* Can eventually relax perm check since server enforces too */
1459                 if (!capable(CAP_SYS_ADMIN))
1460                         rc = -EPERM;
1461                 else  {
1462                         memset(&io_iov, 0, sizeof(io_iov));
1463                         rqst[1].rq_iov = io_iov;
1464                         rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
1465
1466                         rc = SMB2_ioctl_init(tcon, &rqst[1],
1467                                              COMPOUND_FID, COMPOUND_FID,
1468                                              qi.info_type, true, buffer,
1469                                              qi.output_buffer_length,
1470                                              CIFSMaxBufSize);
1471                 }
1472         } else if (qi.flags == PASSTHRU_SET_INFO) {
1473                 /* Can eventually relax perm check since server enforces too */
1474                 if (!capable(CAP_SYS_ADMIN))
1475                         rc = -EPERM;
1476                 else  {
1477                         memset(&si_iov, 0, sizeof(si_iov));
1478                         rqst[1].rq_iov = si_iov;
1479                         rqst[1].rq_nvec = 1;
1480
1481                         size[0] = 8;
1482                         data[0] = buffer;
1483
1484                         rc = SMB2_set_info_init(tcon, &rqst[1],
1485                                         COMPOUND_FID, COMPOUND_FID,
1486                                         current->tgid,
1487                                         FILE_END_OF_FILE_INFORMATION,
1488                                         SMB2_O_INFO_FILE, 0, data, size);
1489                 }
1490         } else if (qi.flags == PASSTHRU_QUERY_INFO) {
1491                 memset(&qi_iov, 0, sizeof(qi_iov));
1492                 rqst[1].rq_iov = qi_iov;
1493                 rqst[1].rq_nvec = 1;
1494
1495                 rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID,
1496                                   COMPOUND_FID, qi.file_info_class,
1497                                   qi.info_type, qi.additional_information,
1498                                   qi.input_buffer_length,
1499                                   qi.output_buffer_length, buffer);
1500         } else { /* unknown flags */
1501                 cifs_tcon_dbg(VFS, "invalid passthru query flags: 0x%x\n", qi.flags);
1502                 rc = -EINVAL;
1503         }
1504
1505         if (rc)
1506                 goto iqinf_exit;
1507         smb2_set_next_command(tcon, &rqst[1]);
1508         smb2_set_related(&rqst[1]);
1509
1510         /* Close */
1511         memset(&close_iov, 0, sizeof(close_iov));
1512         rqst[2].rq_iov = close_iov;
1513         rqst[2].rq_nvec = 1;
1514
1515         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
1516         if (rc)
1517                 goto iqinf_exit;
1518         smb2_set_related(&rqst[2]);
1519
1520         rc = compound_send_recv(xid, ses, flags, 3, rqst,
1521                                 resp_buftype, rsp_iov);
1522         if (rc)
1523                 goto iqinf_exit;
1524
1525         /* No need to bump num_remote_opens since handle immediately closed */
1526         if (qi.flags & PASSTHRU_FSCTL) {
1527                 pqi = (struct smb_query_info __user *)arg;
1528                 io_rsp = (struct smb2_ioctl_rsp *)rsp_iov[1].iov_base;
1529                 if (le32_to_cpu(io_rsp->OutputCount) < qi.input_buffer_length)
1530                         qi.input_buffer_length = le32_to_cpu(io_rsp->OutputCount);
1531                 if (qi.input_buffer_length > 0 &&
1532                     le32_to_cpu(io_rsp->OutputOffset) + qi.input_buffer_length > rsp_iov[1].iov_len) {
1533                         rc = -EFAULT;
1534                         goto iqinf_exit;
1535                 }
1536                 if (copy_to_user(&pqi->input_buffer_length, &qi.input_buffer_length,
1537                                  sizeof(qi.input_buffer_length))) {
1538                         rc = -EFAULT;
1539                         goto iqinf_exit;
1540                 }
1541                 if (copy_to_user((void __user *)pqi + sizeof(struct smb_query_info),
1542                                  (const void *)io_rsp + le32_to_cpu(io_rsp->OutputOffset),
1543                                  qi.input_buffer_length)) {
1544                         rc = -EFAULT;
1545                         goto iqinf_exit;
1546                 }
1547         } else {
1548                 pqi = (struct smb_query_info __user *)arg;
1549                 qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
1550                 if (le32_to_cpu(qi_rsp->OutputBufferLength) < qi.input_buffer_length)
1551                         qi.input_buffer_length = le32_to_cpu(qi_rsp->OutputBufferLength);
1552                 if (copy_to_user(&pqi->input_buffer_length, &qi.input_buffer_length,
1553                                  sizeof(qi.input_buffer_length))) {
1554                         rc = -EFAULT;
1555                         goto iqinf_exit;
1556                 }
1557                 if (copy_to_user(pqi + 1, qi_rsp->Buffer, qi.input_buffer_length)) {
1558                         rc = -EFAULT;
1559                         goto iqinf_exit;
1560                 }
1561         }
1562
1563  iqinf_exit:
1564         kfree(buffer);
1565         SMB2_open_free(&rqst[0]);
1566         if (qi.flags & PASSTHRU_FSCTL)
1567                 SMB2_ioctl_free(&rqst[1]);
1568         else
1569                 SMB2_query_info_free(&rqst[1]);
1570
1571         SMB2_close_free(&rqst[2]);
1572         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1573         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1574         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1575         return rc;
1576 }
1577
1578 static ssize_t
1579 smb2_copychunk_range(const unsigned int xid,
1580                         struct cifsFileInfo *srcfile,
1581                         struct cifsFileInfo *trgtfile, u64 src_off,
1582                         u64 len, u64 dest_off)
1583 {
1584         int rc;
1585         unsigned int ret_data_len;
1586         struct copychunk_ioctl *pcchunk;
1587         struct copychunk_ioctl_rsp *retbuf = NULL;
1588         struct cifs_tcon *tcon;
1589         int chunks_copied = 0;
1590         bool chunk_sizes_updated = false;
1591         ssize_t bytes_written, total_bytes_written = 0;
1592
1593         pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
1594
1595         if (pcchunk == NULL)
1596                 return -ENOMEM;
1597
1598         cifs_dbg(FYI, "%s: about to call request res key\n", __func__);
1599         /* Request a key from the server to identify the source of the copy */
1600         rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
1601                                 srcfile->fid.persistent_fid,
1602                                 srcfile->fid.volatile_fid, pcchunk);
1603
1604         /* Note: request_res_key sets res_key null only if rc !=0 */
1605         if (rc)
1606                 goto cchunk_out;
1607
1608         /* For now array only one chunk long, will make more flexible later */
1609         pcchunk->ChunkCount = cpu_to_le32(1);
1610         pcchunk->Reserved = 0;
1611         pcchunk->Reserved2 = 0;
1612
1613         tcon = tlink_tcon(trgtfile->tlink);
1614
1615         while (len > 0) {
1616                 pcchunk->SourceOffset = cpu_to_le64(src_off);
1617                 pcchunk->TargetOffset = cpu_to_le64(dest_off);
1618                 pcchunk->Length =
1619                         cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));
1620
1621                 /* Request server copy to target from src identified by key */
1622                 rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1623                         trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
1624                         true /* is_fsctl */, (char *)pcchunk,
1625                         sizeof(struct copychunk_ioctl), CIFSMaxBufSize,
1626                         (char **)&retbuf, &ret_data_len);
1627                 if (rc == 0) {
1628                         if (ret_data_len !=
1629                                         sizeof(struct copychunk_ioctl_rsp)) {
1630                                 cifs_tcon_dbg(VFS, "invalid cchunk response size\n");
1631                                 rc = -EIO;
1632                                 goto cchunk_out;
1633                         }
1634                         if (retbuf->TotalBytesWritten == 0) {
1635                                 cifs_dbg(FYI, "no bytes copied\n");
1636                                 rc = -EIO;
1637                                 goto cchunk_out;
1638                         }
1639                         /*
1640                          * Check if server claimed to write more than we asked
1641                          */
1642                         if (le32_to_cpu(retbuf->TotalBytesWritten) >
1643                             le32_to_cpu(pcchunk->Length)) {
1644                                 cifs_tcon_dbg(VFS, "invalid copy chunk response\n");
1645                                 rc = -EIO;
1646                                 goto cchunk_out;
1647                         }
1648                         if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
1649                                 cifs_tcon_dbg(VFS, "invalid num chunks written\n");
1650                                 rc = -EIO;
1651                                 goto cchunk_out;
1652                         }
1653                         chunks_copied++;
1654
1655                         bytes_written = le32_to_cpu(retbuf->TotalBytesWritten);
1656                         src_off += bytes_written;
1657                         dest_off += bytes_written;
1658                         len -= bytes_written;
1659                         total_bytes_written += bytes_written;
1660
1661                         cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %zu\n",
1662                                 le32_to_cpu(retbuf->ChunksWritten),
1663                                 le32_to_cpu(retbuf->ChunkBytesWritten),
1664                                 bytes_written);
1665                 } else if (rc == -EINVAL) {
1666                         if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
1667                                 goto cchunk_out;
1668
1669                         cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
1670                                 le32_to_cpu(retbuf->ChunksWritten),
1671                                 le32_to_cpu(retbuf->ChunkBytesWritten),
1672                                 le32_to_cpu(retbuf->TotalBytesWritten));
1673
1674                         /*
1675                          * Check if this is the first request using these sizes,
1676                          * (ie check if copy succeed once with original sizes
1677                          * and check if the server gave us different sizes after
1678                          * we already updated max sizes on previous request).
1679                          * if not then why is the server returning an error now
1680                          */
1681                         if ((chunks_copied != 0) || chunk_sizes_updated)
1682                                 goto cchunk_out;
1683
1684                         /* Check that server is not asking us to grow size */
1685                         if (le32_to_cpu(retbuf->ChunkBytesWritten) <
1686                                         tcon->max_bytes_chunk)
1687                                 tcon->max_bytes_chunk =
1688                                         le32_to_cpu(retbuf->ChunkBytesWritten);
1689                         else
1690                                 goto cchunk_out; /* server gave us bogus size */
1691
1692                         /* No need to change MaxChunks since already set to 1 */
1693                         chunk_sizes_updated = true;
1694                 } else
1695                         goto cchunk_out;
1696         }
1697
1698 cchunk_out:
1699         kfree(pcchunk);
1700         kfree(retbuf);
1701         if (rc)
1702                 return rc;
1703         else
1704                 return total_bytes_written;
1705 }
1706
1707 static int
1708 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
1709                 struct cifs_fid *fid)
1710 {
1711         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1712 }
1713
1714 static unsigned int
1715 smb2_read_data_offset(char *buf)
1716 {
1717         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1718
1719         return rsp->DataOffset;
1720 }
1721
1722 static unsigned int
1723 smb2_read_data_length(char *buf, bool in_remaining)
1724 {
1725         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1726
1727         if (in_remaining)
1728                 return le32_to_cpu(rsp->DataRemaining);
1729
1730         return le32_to_cpu(rsp->DataLength);
1731 }
1732
1733
1734 static int
1735 smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
1736                struct cifs_io_parms *parms, unsigned int *bytes_read,
1737                char **buf, int *buf_type)
1738 {
1739         parms->persistent_fid = pfid->persistent_fid;
1740         parms->volatile_fid = pfid->volatile_fid;
1741         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
1742 }
1743
1744 static int
1745 smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
1746                 struct cifs_io_parms *parms, unsigned int *written,
1747                 struct kvec *iov, unsigned long nr_segs)
1748 {
1749
1750         parms->persistent_fid = pfid->persistent_fid;
1751         parms->volatile_fid = pfid->volatile_fid;
1752         return SMB2_write(xid, parms, written, iov, nr_segs);
1753 }
1754
1755 /* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
1756 static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
1757                 struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
1758 {
1759         struct cifsInodeInfo *cifsi;
1760         int rc;
1761
1762         cifsi = CIFS_I(inode);
1763
1764         /* if file already sparse don't bother setting sparse again */
1765         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
1766                 return true; /* already sparse */
1767
1768         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
1769                 return true; /* already not sparse */
1770
1771         /*
1772          * Can't check for sparse support on share the usual way via the
1773          * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
1774          * since Samba server doesn't set the flag on the share, yet
1775          * supports the set sparse FSCTL and returns sparse correctly
1776          * in the file attributes. If we fail setting sparse though we
1777          * mark that server does not support sparse files for this share
1778          * to avoid repeatedly sending the unsupported fsctl to server
1779          * if the file is repeatedly extended.
1780          */
1781         if (tcon->broken_sparse_sup)
1782                 return false;
1783
1784         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1785                         cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
1786                         true /* is_fctl */,
1787                         &setsparse, 1, CIFSMaxBufSize, NULL, NULL);
1788         if (rc) {
1789                 tcon->broken_sparse_sup = true;
1790                 cifs_dbg(FYI, "set sparse rc = %d\n", rc);
1791                 return false;
1792         }
1793
1794         if (setsparse)
1795                 cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
1796         else
1797                 cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
1798
1799         return true;
1800 }
1801
1802 static int
1803 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
1804                    struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
1805 {
1806         __le64 eof = cpu_to_le64(size);
1807         struct inode *inode;
1808
1809         /*
1810          * If extending file more than one page make sparse. Many Linux fs
1811          * make files sparse by default when extending via ftruncate
1812          */
1813         inode = d_inode(cfile->dentry);
1814
1815         if (!set_alloc && (size > inode->i_size + 8192)) {
1816                 __u8 set_sparse = 1;
1817
1818                 /* whether set sparse succeeds or not, extend the file */
1819                 smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
1820         }
1821
1822         return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
1823                             cfile->fid.volatile_fid, cfile->pid, &eof);
1824 }
1825
1826 static int
1827 smb2_duplicate_extents(const unsigned int xid,
1828                         struct cifsFileInfo *srcfile,
1829                         struct cifsFileInfo *trgtfile, u64 src_off,
1830                         u64 len, u64 dest_off)
1831 {
1832         int rc;
1833         unsigned int ret_data_len;
1834         struct duplicate_extents_to_file dup_ext_buf;
1835         struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
1836
1837         /* server fileays advertise duplicate extent support with this flag */
1838         if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
1839              FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
1840                 return -EOPNOTSUPP;
1841
1842         dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
1843         dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
1844         dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
1845         dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
1846         dup_ext_buf.ByteCount = cpu_to_le64(len);
1847         cifs_dbg(FYI, "Duplicate extents: src off %lld dst off %lld len %lld\n",
1848                 src_off, dest_off, len);
1849
1850         rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
1851         if (rc)
1852                 goto duplicate_extents_out;
1853
1854         rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1855                         trgtfile->fid.volatile_fid,
1856                         FSCTL_DUPLICATE_EXTENTS_TO_FILE,
1857                         true /* is_fsctl */,
1858                         (char *)&dup_ext_buf,
1859                         sizeof(struct duplicate_extents_to_file),
1860                         CIFSMaxBufSize, NULL,
1861                         &ret_data_len);
1862
1863         if (ret_data_len > 0)
1864                 cifs_dbg(FYI, "Non-zero response length in duplicate extents\n");
1865
1866 duplicate_extents_out:
1867         return rc;
1868 }
1869
1870 static int
1871 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1872                    struct cifsFileInfo *cfile)
1873 {
1874         return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
1875                             cfile->fid.volatile_fid);
1876 }
1877
1878 static int
1879 smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
1880                    struct cifsFileInfo *cfile)
1881 {
1882         struct fsctl_set_integrity_information_req integr_info;
1883         unsigned int ret_data_len;
1884
1885         integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
1886         integr_info.Flags = 0;
1887         integr_info.Reserved = 0;
1888
1889         return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1890                         cfile->fid.volatile_fid,
1891                         FSCTL_SET_INTEGRITY_INFORMATION,
1892                         true /* is_fsctl */,
1893                         (char *)&integr_info,
1894                         sizeof(struct fsctl_set_integrity_information_req),
1895                         CIFSMaxBufSize, NULL,
1896                         &ret_data_len);
1897
1898 }
1899
1900 /* GMT Token is @GMT-YYYY.MM.DD-HH.MM.SS Unicode which is 48 bytes + null */
1901 #define GMT_TOKEN_SIZE 50
1902
1903 #define MIN_SNAPSHOT_ARRAY_SIZE 16 /* See MS-SMB2 section 3.3.5.15.1 */
1904
1905 /*
1906  * Input buffer contains (empty) struct smb_snapshot array with size filled in
1907  * For output see struct SRV_SNAPSHOT_ARRAY in MS-SMB2 section 2.2.32.2
1908  */
1909 static int
1910 smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
1911                    struct cifsFileInfo *cfile, void __user *ioc_buf)
1912 {
1913         char *retbuf = NULL;
1914         unsigned int ret_data_len = 0;
1915         int rc;
1916         u32 max_response_size;
1917         struct smb_snapshot_array snapshot_in;
1918
1919         /*
1920          * On the first query to enumerate the list of snapshots available
1921          * for this volume the buffer begins with 0 (number of snapshots
1922          * which can be returned is zero since at that point we do not know
1923          * how big the buffer needs to be). On the second query,
1924          * it (ret_data_len) is set to number of snapshots so we can
1925          * know to set the maximum response size larger (see below).
1926          */
1927         if (get_user(ret_data_len, (unsigned int __user *)ioc_buf))
1928                 return -EFAULT;
1929
1930         /*
1931          * Note that for snapshot queries that servers like Azure expect that
1932          * the first query be minimal size (and just used to get the number/size
1933          * of previous versions) so response size must be specified as EXACTLY
1934          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
1935          * of eight bytes.
1936          */
1937         if (ret_data_len == 0)
1938                 max_response_size = MIN_SNAPSHOT_ARRAY_SIZE;
1939         else
1940                 max_response_size = CIFSMaxBufSize;
1941
1942         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1943                         cfile->fid.volatile_fid,
1944                         FSCTL_SRV_ENUMERATE_SNAPSHOTS,
1945                         true /* is_fsctl */,
1946                         NULL, 0 /* no input data */, max_response_size,
1947                         (char **)&retbuf,
1948                         &ret_data_len);
1949         cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d\n",
1950                         rc, ret_data_len);
1951         if (rc)
1952                 return rc;
1953
1954         if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) {
1955                 /* Fixup buffer */
1956                 if (copy_from_user(&snapshot_in, ioc_buf,
1957                     sizeof(struct smb_snapshot_array))) {
1958                         rc = -EFAULT;
1959                         kfree(retbuf);
1960                         return rc;
1961                 }
1962
1963                 /*
1964                  * Check for min size, ie not large enough to fit even one GMT
1965                  * token (snapshot).  On the first ioctl some users may pass in
1966                  * smaller size (or zero) to simply get the size of the array
1967                  * so the user space caller can allocate sufficient memory
1968                  * and retry the ioctl again with larger array size sufficient
1969                  * to hold all of the snapshot GMT tokens on the second try.
1970                  */
1971                 if (snapshot_in.snapshot_array_size < GMT_TOKEN_SIZE)
1972                         ret_data_len = sizeof(struct smb_snapshot_array);
1973
1974                 /*
1975                  * We return struct SRV_SNAPSHOT_ARRAY, followed by
1976                  * the snapshot array (of 50 byte GMT tokens) each
1977                  * representing an available previous version of the data
1978                  */
1979                 if (ret_data_len > (snapshot_in.snapshot_array_size +
1980                                         sizeof(struct smb_snapshot_array)))
1981                         ret_data_len = snapshot_in.snapshot_array_size +
1982                                         sizeof(struct smb_snapshot_array);
1983
1984                 if (copy_to_user(ioc_buf, retbuf, ret_data_len))
1985                         rc = -EFAULT;
1986         }
1987
1988         kfree(retbuf);
1989         return rc;
1990 }
1991
1992 static int
1993 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
1994                      const char *path, struct cifs_sb_info *cifs_sb,
1995                      struct cifs_fid *fid, __u16 search_flags,
1996                      struct cifs_search_info *srch_inf)
1997 {
1998         __le16 *utf16_path;
1999         int rc;
2000         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2001         struct cifs_open_parms oparms;
2002
2003         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2004         if (!utf16_path)
2005                 return -ENOMEM;
2006
2007         oparms.tcon = tcon;
2008         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
2009         oparms.disposition = FILE_OPEN;
2010         if (backup_cred(cifs_sb))
2011                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2012         else
2013                 oparms.create_options = 0;
2014         oparms.fid = fid;
2015         oparms.reconnect = false;
2016
2017         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
2018         kfree(utf16_path);
2019         if (rc) {
2020                 cifs_dbg(FYI, "open dir failed rc=%d\n", rc);
2021                 return rc;
2022         }
2023
2024         srch_inf->entries_in_buffer = 0;
2025         srch_inf->index_of_last_entry = 2;
2026
2027         rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
2028                                   fid->volatile_fid, 0, srch_inf);
2029         if (rc) {
2030                 cifs_dbg(FYI, "query directory failed rc=%d\n", rc);
2031                 SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
2032         }
2033         return rc;
2034 }
2035
2036 static int
2037 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
2038                     struct cifs_fid *fid, __u16 search_flags,
2039                     struct cifs_search_info *srch_inf)
2040 {
2041         return SMB2_query_directory(xid, tcon, fid->persistent_fid,
2042                                     fid->volatile_fid, 0, srch_inf);
2043 }
2044
2045 static int
2046 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
2047                struct cifs_fid *fid)
2048 {
2049         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
2050 }
2051
2052 /*
2053  * If we negotiate SMB2 protocol and get STATUS_PENDING - update
2054  * the number of credits and return true. Otherwise - return false.
2055  */
2056 static bool
2057 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server)
2058 {
2059         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
2060
2061         if (shdr->Status != STATUS_PENDING)
2062                 return false;
2063
2064         if (shdr->CreditRequest) {
2065                 spin_lock(&server->req_lock);
2066                 server->credits += le16_to_cpu(shdr->CreditRequest);
2067                 spin_unlock(&server->req_lock);
2068                 wake_up(&server->request_q);
2069         }
2070
2071         return true;
2072 }
2073
2074 static bool
2075 smb2_is_session_expired(char *buf)
2076 {
2077         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
2078
2079         if (shdr->Status != STATUS_NETWORK_SESSION_EXPIRED &&
2080             shdr->Status != STATUS_USER_SESSION_DELETED)
2081                 return false;
2082
2083         trace_smb3_ses_expired(shdr->TreeId, shdr->SessionId,
2084                                le16_to_cpu(shdr->Command),
2085                                le64_to_cpu(shdr->MessageId));
2086         cifs_dbg(FYI, "Session expired or deleted\n");
2087
2088         return true;
2089 }
2090
2091 static int
2092 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
2093                      struct cifsInodeInfo *cinode)
2094 {
2095         if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
2096                 return SMB2_lease_break(0, tcon, cinode->lease_key,
2097                                         smb2_get_lease_state(cinode));
2098
2099         return SMB2_oplock_break(0, tcon, fid->persistent_fid,
2100                                  fid->volatile_fid,
2101                                  CIFS_CACHE_READ(cinode) ? 1 : 0);
2102 }
2103
2104 void
2105 smb2_set_related(struct smb_rqst *rqst)
2106 {
2107         struct smb2_sync_hdr *shdr;
2108
2109         shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
2110         if (shdr == NULL) {
2111                 cifs_dbg(FYI, "shdr NULL in smb2_set_related\n");
2112                 return;
2113         }
2114         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2115 }
2116
2117 char smb2_padding[7] = {0, 0, 0, 0, 0, 0, 0};
2118
2119 void
2120 smb2_set_next_command(struct cifs_tcon *tcon, struct smb_rqst *rqst)
2121 {
2122         struct smb2_sync_hdr *shdr;
2123         struct cifs_ses *ses = tcon->ses;
2124         struct TCP_Server_Info *server = ses->server;
2125         unsigned long len = smb_rqst_len(server, rqst);
2126         int i, num_padding;
2127
2128         shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
2129         if (shdr == NULL) {
2130                 cifs_dbg(FYI, "shdr NULL in smb2_set_next_command\n");
2131                 return;
2132         }
2133
2134         /* SMB headers in a compound are 8 byte aligned. */
2135
2136         /* No padding needed */
2137         if (!(len & 7))
2138                 goto finished;
2139
2140         num_padding = 8 - (len & 7);
2141         if (!smb3_encryption_required(tcon)) {
2142                 /*
2143                  * If we do not have encryption then we can just add an extra
2144                  * iov for the padding.
2145                  */
2146                 rqst->rq_iov[rqst->rq_nvec].iov_base = smb2_padding;
2147                 rqst->rq_iov[rqst->rq_nvec].iov_len = num_padding;
2148                 rqst->rq_nvec++;
2149                 len += num_padding;
2150         } else {
2151                 /*
2152                  * We can not add a small padding iov for the encryption case
2153                  * because the encryption framework can not handle the padding
2154                  * iovs.
2155                  * We have to flatten this into a single buffer and add
2156                  * the padding to it.
2157                  */
2158                 for (i = 1; i < rqst->rq_nvec; i++) {
2159                         memcpy(rqst->rq_iov[0].iov_base +
2160                                rqst->rq_iov[0].iov_len,
2161                                rqst->rq_iov[i].iov_base,
2162                                rqst->rq_iov[i].iov_len);
2163                         rqst->rq_iov[0].iov_len += rqst->rq_iov[i].iov_len;
2164                 }
2165                 memset(rqst->rq_iov[0].iov_base + rqst->rq_iov[0].iov_len,
2166                        0, num_padding);
2167                 rqst->rq_iov[0].iov_len += num_padding;
2168                 len += num_padding;
2169                 rqst->rq_nvec = 1;
2170         }
2171
2172  finished:
2173         shdr->NextCommand = cpu_to_le32(len);
2174 }
2175
2176 /*
2177  * Passes the query info response back to the caller on success.
2178  * Caller need to free this with free_rsp_buf().
2179  */
2180 int
2181 smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
2182                          __le16 *utf16_path, u32 desired_access,
2183                          u32 class, u32 type, u32 output_len,
2184                          struct kvec *rsp, int *buftype,
2185                          struct cifs_sb_info *cifs_sb)
2186 {
2187         struct cifs_ses *ses = tcon->ses;
2188         int flags = 0;
2189         struct smb_rqst rqst[3];
2190         int resp_buftype[3];
2191         struct kvec rsp_iov[3];
2192         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2193         struct kvec qi_iov[1];
2194         struct kvec close_iov[1];
2195         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2196         struct cifs_open_parms oparms;
2197         struct cifs_fid fid;
2198         int rc;
2199
2200         if (smb3_encryption_required(tcon))
2201                 flags |= CIFS_TRANSFORM_REQ;
2202
2203         memset(rqst, 0, sizeof(rqst));
2204         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
2205         memset(rsp_iov, 0, sizeof(rsp_iov));
2206
2207         memset(&open_iov, 0, sizeof(open_iov));
2208         rqst[0].rq_iov = open_iov;
2209         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2210
2211         oparms.tcon = tcon;
2212         oparms.desired_access = desired_access;
2213         oparms.disposition = FILE_OPEN;
2214         if (cifs_sb && backup_cred(cifs_sb))
2215                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2216         else
2217                 oparms.create_options = 0;
2218         oparms.fid = &fid;
2219         oparms.reconnect = false;
2220
2221         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path);
2222         if (rc)
2223                 goto qic_exit;
2224         smb2_set_next_command(tcon, &rqst[0]);
2225
2226         memset(&qi_iov, 0, sizeof(qi_iov));
2227         rqst[1].rq_iov = qi_iov;
2228         rqst[1].rq_nvec = 1;
2229
2230         rc = SMB2_query_info_init(tcon, &rqst[1], COMPOUND_FID, COMPOUND_FID,
2231                                   class, type, 0,
2232                                   output_len, 0,
2233                                   NULL);
2234         if (rc)
2235                 goto qic_exit;
2236         smb2_set_next_command(tcon, &rqst[1]);
2237         smb2_set_related(&rqst[1]);
2238
2239         memset(&close_iov, 0, sizeof(close_iov));
2240         rqst[2].rq_iov = close_iov;
2241         rqst[2].rq_nvec = 1;
2242
2243         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
2244         if (rc)
2245                 goto qic_exit;
2246         smb2_set_related(&rqst[2]);
2247
2248         rc = compound_send_recv(xid, ses, flags, 3, rqst,
2249                                 resp_buftype, rsp_iov);
2250         if (rc) {
2251                 free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2252                 if (rc == -EREMCHG) {
2253                         tcon->need_reconnect = true;
2254                         printk_once(KERN_WARNING "server share %s deleted\n",
2255                                     tcon->treeName);
2256                 }
2257                 goto qic_exit;
2258         }
2259         *rsp = rsp_iov[1];
2260         *buftype = resp_buftype[1];
2261
2262  qic_exit:
2263         SMB2_open_free(&rqst[0]);
2264         SMB2_query_info_free(&rqst[1]);
2265         SMB2_close_free(&rqst[2]);
2266         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2267         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
2268         return rc;
2269 }
2270
2271 static int
2272 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2273              struct kstatfs *buf)
2274 {
2275         struct smb2_query_info_rsp *rsp;
2276         struct smb2_fs_full_size_info *info = NULL;
2277         __le16 utf16_path = 0; /* Null - open root of share */
2278         struct kvec rsp_iov = {NULL, 0};
2279         int buftype = CIFS_NO_BUFFER;
2280         int rc;
2281
2282
2283         rc = smb2_query_info_compound(xid, tcon, &utf16_path,
2284                                       FILE_READ_ATTRIBUTES,
2285                                       FS_FULL_SIZE_INFORMATION,
2286                                       SMB2_O_INFO_FILESYSTEM,
2287                                       sizeof(struct smb2_fs_full_size_info),
2288                                       &rsp_iov, &buftype, NULL);
2289         if (rc)
2290                 goto qfs_exit;
2291
2292         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2293         buf->f_type = SMB2_MAGIC_NUMBER;
2294         info = (struct smb2_fs_full_size_info *)(
2295                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
2296         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
2297                                le32_to_cpu(rsp->OutputBufferLength),
2298                                &rsp_iov,
2299                                sizeof(struct smb2_fs_full_size_info));
2300         if (!rc)
2301                 smb2_copy_fs_info_to_kstatfs(info, buf);
2302
2303 qfs_exit:
2304         free_rsp_buf(buftype, rsp_iov.iov_base);
2305         return rc;
2306 }
2307
2308 static int
2309 smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2310              struct kstatfs *buf)
2311 {
2312         int rc;
2313         __le16 srch_path = 0; /* Null - open root of share */
2314         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2315         struct cifs_open_parms oparms;
2316         struct cifs_fid fid;
2317
2318         if (!tcon->posix_extensions)
2319                 return smb2_queryfs(xid, tcon, buf);
2320
2321         oparms.tcon = tcon;
2322         oparms.desired_access = FILE_READ_ATTRIBUTES;
2323         oparms.disposition = FILE_OPEN;
2324         oparms.create_options = 0;
2325         oparms.fid = &fid;
2326         oparms.reconnect = false;
2327
2328         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL, NULL);
2329         if (rc)
2330                 return rc;
2331
2332         rc = SMB311_posix_qfs_info(xid, tcon, fid.persistent_fid,
2333                                    fid.volatile_fid, buf);
2334         buf->f_type = SMB2_MAGIC_NUMBER;
2335         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2336         return rc;
2337 }
2338
2339 static bool
2340 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
2341 {
2342         return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
2343                ob1->fid.volatile_fid == ob2->fid.volatile_fid;
2344 }
2345
2346 static int
2347 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
2348                __u64 length, __u32 type, int lock, int unlock, bool wait)
2349 {
2350         if (unlock && !lock)
2351                 type = SMB2_LOCKFLAG_UNLOCK;
2352         return SMB2_lock(xid, tlink_tcon(cfile->tlink),
2353                          cfile->fid.persistent_fid, cfile->fid.volatile_fid,
2354                          current->tgid, length, offset, type, wait);
2355 }
2356
2357 static void
2358 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
2359 {
2360         memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
2361 }
2362
2363 static void
2364 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
2365 {
2366         memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
2367 }
2368
2369 static void
2370 smb2_new_lease_key(struct cifs_fid *fid)
2371 {
2372         generate_random_uuid(fid->lease_key);
2373 }
2374
2375 static int
2376 smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
2377                    const char *search_name,
2378                    struct dfs_info3_param **target_nodes,
2379                    unsigned int *num_of_nodes,
2380                    const struct nls_table *nls_codepage, int remap)
2381 {
2382         int rc;
2383         __le16 *utf16_path = NULL;
2384         int utf16_path_len = 0;
2385         struct cifs_tcon *tcon;
2386         struct fsctl_get_dfs_referral_req *dfs_req = NULL;
2387         struct get_dfs_referral_rsp *dfs_rsp = NULL;
2388         u32 dfs_req_size = 0, dfs_rsp_size = 0;
2389
2390         cifs_dbg(FYI, "%s: path: %s\n", __func__, search_name);
2391
2392         /*
2393          * Try to use the IPC tcon, otherwise just use any
2394          */
2395         tcon = ses->tcon_ipc;
2396         if (tcon == NULL) {
2397                 spin_lock(&cifs_tcp_ses_lock);
2398                 tcon = list_first_entry_or_null(&ses->tcon_list,
2399                                                 struct cifs_tcon,
2400                                                 tcon_list);
2401                 if (tcon)
2402                         tcon->tc_count++;
2403                 spin_unlock(&cifs_tcp_ses_lock);
2404         }
2405
2406         if (tcon == NULL) {
2407                 cifs_dbg(VFS, "session %p has no tcon available for a dfs referral request\n",
2408                          ses);
2409                 rc = -ENOTCONN;
2410                 goto out;
2411         }
2412
2413         utf16_path = cifs_strndup_to_utf16(search_name, PATH_MAX,
2414                                            &utf16_path_len,
2415                                            nls_codepage, remap);
2416         if (!utf16_path) {
2417                 rc = -ENOMEM;
2418                 goto out;
2419         }
2420
2421         dfs_req_size = sizeof(*dfs_req) + utf16_path_len;
2422         dfs_req = kzalloc(dfs_req_size, GFP_KERNEL);
2423         if (!dfs_req) {
2424                 rc = -ENOMEM;
2425                 goto out;
2426         }
2427
2428         /* Highest DFS referral version understood */
2429         dfs_req->MaxReferralLevel = DFS_VERSION;
2430
2431         /* Path to resolve in an UTF-16 null-terminated string */
2432         memcpy(dfs_req->RequestFileName, utf16_path, utf16_path_len);
2433
2434         do {
2435                 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
2436                                 FSCTL_DFS_GET_REFERRALS,
2437                                 true /* is_fsctl */,
2438                                 (char *)dfs_req, dfs_req_size, CIFSMaxBufSize,
2439                                 (char **)&dfs_rsp, &dfs_rsp_size);
2440         } while (rc == -EAGAIN);
2441
2442         if (rc) {
2443                 if ((rc != -ENOENT) && (rc != -EOPNOTSUPP))
2444                         cifs_tcon_dbg(VFS, "ioctl error in %s rc=%d\n", __func__, rc);
2445                 goto out;
2446         }
2447
2448         rc = parse_dfs_referrals(dfs_rsp, dfs_rsp_size,
2449                                  num_of_nodes, target_nodes,
2450                                  nls_codepage, remap, search_name,
2451                                  true /* is_unicode */);
2452         if (rc) {
2453                 cifs_tcon_dbg(VFS, "parse error in %s rc=%d\n", __func__, rc);
2454                 goto out;
2455         }
2456
2457  out:
2458         if (tcon && !tcon->ipc) {
2459                 /* ipc tcons are not refcounted */
2460                 spin_lock(&cifs_tcp_ses_lock);
2461                 tcon->tc_count--;
2462                 spin_unlock(&cifs_tcp_ses_lock);
2463         }
2464         kfree(utf16_path);
2465         kfree(dfs_req);
2466         kfree(dfs_rsp);
2467         return rc;
2468 }
2469
2470 static int
2471 parse_reparse_posix(struct reparse_posix_data *symlink_buf,
2472                       u32 plen, char **target_path,
2473                       struct cifs_sb_info *cifs_sb)
2474 {
2475         unsigned int len;
2476
2477         /* See MS-FSCC 2.1.2.6 for the 'NFS' style reparse tags */
2478         len = le16_to_cpu(symlink_buf->ReparseDataLength);
2479
2480         if (le64_to_cpu(symlink_buf->InodeType) != NFS_SPECFILE_LNK) {
2481                 cifs_dbg(VFS, "%lld not a supported symlink type\n",
2482                         le64_to_cpu(symlink_buf->InodeType));
2483                 return -EOPNOTSUPP;
2484         }
2485
2486         *target_path = cifs_strndup_from_utf16(
2487                                 symlink_buf->PathBuffer,
2488                                 len, true, cifs_sb->local_nls);
2489         if (!(*target_path))
2490                 return -ENOMEM;
2491
2492         convert_delimiter(*target_path, '/');
2493         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2494
2495         return 0;
2496 }
2497
2498 static int
2499 parse_reparse_symlink(struct reparse_symlink_data_buffer *symlink_buf,
2500                       u32 plen, char **target_path,
2501                       struct cifs_sb_info *cifs_sb)
2502 {
2503         unsigned int sub_len;
2504         unsigned int sub_offset;
2505
2506         /* We handle Symbolic Link reparse tag here. See: MS-FSCC 2.1.2.4 */
2507
2508         sub_offset = le16_to_cpu(symlink_buf->SubstituteNameOffset);
2509         sub_len = le16_to_cpu(symlink_buf->SubstituteNameLength);
2510         if (sub_offset + 20 > plen ||
2511             sub_offset + sub_len + 20 > plen) {
2512                 cifs_dbg(VFS, "srv returned malformed symlink buffer\n");
2513                 return -EIO;
2514         }
2515
2516         *target_path = cifs_strndup_from_utf16(
2517                                 symlink_buf->PathBuffer + sub_offset,
2518                                 sub_len, true, cifs_sb->local_nls);
2519         if (!(*target_path))
2520                 return -ENOMEM;
2521
2522         convert_delimiter(*target_path, '/');
2523         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2524
2525         return 0;
2526 }
2527
2528 static int
2529 parse_reparse_point(struct reparse_data_buffer *buf,
2530                     u32 plen, char **target_path,
2531                     struct cifs_sb_info *cifs_sb)
2532 {
2533         if (plen < sizeof(struct reparse_data_buffer)) {
2534                 cifs_dbg(VFS, "reparse buffer is too small. Must be "
2535                          "at least 8 bytes but was %d\n", plen);
2536                 return -EIO;
2537         }
2538
2539         if (plen < le16_to_cpu(buf->ReparseDataLength) +
2540             sizeof(struct reparse_data_buffer)) {
2541                 cifs_dbg(VFS, "srv returned invalid reparse buf "
2542                          "length: %d\n", plen);
2543                 return -EIO;
2544         }
2545
2546         /* See MS-FSCC 2.1.2 */
2547         switch (le32_to_cpu(buf->ReparseTag)) {
2548         case IO_REPARSE_TAG_NFS:
2549                 return parse_reparse_posix(
2550                         (struct reparse_posix_data *)buf,
2551                         plen, target_path, cifs_sb);
2552         case IO_REPARSE_TAG_SYMLINK:
2553                 return parse_reparse_symlink(
2554                         (struct reparse_symlink_data_buffer *)buf,
2555                         plen, target_path, cifs_sb);
2556         default:
2557                 cifs_dbg(VFS, "srv returned unknown symlink buffer "
2558                          "tag:0x%08x\n", le32_to_cpu(buf->ReparseTag));
2559                 return -EOPNOTSUPP;
2560         }
2561 }
2562
2563 #define SMB2_SYMLINK_STRUCT_SIZE \
2564         (sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
2565
2566 static int
2567 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
2568                    struct cifs_sb_info *cifs_sb, const char *full_path,
2569                    char **target_path, bool is_reparse_point)
2570 {
2571         int rc;
2572         __le16 *utf16_path = NULL;
2573         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2574         struct cifs_open_parms oparms;
2575         struct cifs_fid fid;
2576         struct kvec err_iov = {NULL, 0};
2577         struct smb2_err_rsp *err_buf = NULL;
2578         struct smb2_symlink_err_rsp *symlink;
2579         unsigned int sub_len;
2580         unsigned int sub_offset;
2581         unsigned int print_len;
2582         unsigned int print_offset;
2583         int flags = 0;
2584         struct smb_rqst rqst[3];
2585         int resp_buftype[3];
2586         struct kvec rsp_iov[3];
2587         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2588         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
2589         struct kvec close_iov[1];
2590         struct smb2_create_rsp *create_rsp;
2591         struct smb2_ioctl_rsp *ioctl_rsp;
2592         struct reparse_data_buffer *reparse_buf;
2593         u32 plen;
2594
2595         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
2596
2597         *target_path = NULL;
2598
2599         if (smb3_encryption_required(tcon))
2600                 flags |= CIFS_TRANSFORM_REQ;
2601
2602         memset(rqst, 0, sizeof(rqst));
2603         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
2604         memset(rsp_iov, 0, sizeof(rsp_iov));
2605
2606         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2607         if (!utf16_path)
2608                 return -ENOMEM;
2609
2610         /* Open */
2611         memset(&open_iov, 0, sizeof(open_iov));
2612         rqst[0].rq_iov = open_iov;
2613         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2614
2615         memset(&oparms, 0, sizeof(oparms));
2616         oparms.tcon = tcon;
2617         oparms.desired_access = FILE_READ_ATTRIBUTES;
2618         oparms.disposition = FILE_OPEN;
2619
2620         if (backup_cred(cifs_sb))
2621                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2622         else
2623                 oparms.create_options = 0;
2624         if (is_reparse_point)
2625                 oparms.create_options = OPEN_REPARSE_POINT;
2626
2627         oparms.fid = &fid;
2628         oparms.reconnect = false;
2629
2630         rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path);
2631         if (rc)
2632                 goto querty_exit;
2633         smb2_set_next_command(tcon, &rqst[0]);
2634
2635
2636         /* IOCTL */
2637         memset(&io_iov, 0, sizeof(io_iov));
2638         rqst[1].rq_iov = io_iov;
2639         rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
2640
2641         rc = SMB2_ioctl_init(tcon, &rqst[1], fid.persistent_fid,
2642                              fid.volatile_fid, FSCTL_GET_REPARSE_POINT,
2643                              true /* is_fctl */, NULL, 0, CIFSMaxBufSize);
2644         if (rc)
2645                 goto querty_exit;
2646
2647         smb2_set_next_command(tcon, &rqst[1]);
2648         smb2_set_related(&rqst[1]);
2649
2650
2651         /* Close */
2652         memset(&close_iov, 0, sizeof(close_iov));
2653         rqst[2].rq_iov = close_iov;
2654         rqst[2].rq_nvec = 1;
2655
2656         rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID);
2657         if (rc)
2658                 goto querty_exit;
2659
2660         smb2_set_related(&rqst[2]);
2661
2662         rc = compound_send_recv(xid, tcon->ses, flags, 3, rqst,
2663                                 resp_buftype, rsp_iov);
2664
2665         create_rsp = rsp_iov[0].iov_base;
2666         if (create_rsp && create_rsp->sync_hdr.Status)
2667                 err_iov = rsp_iov[0];
2668         ioctl_rsp = rsp_iov[1].iov_base;
2669
2670         /*
2671          * Open was successful and we got an ioctl response.
2672          */
2673         if ((rc == 0) && (is_reparse_point)) {
2674                 /* See MS-FSCC 2.3.23 */
2675
2676                 reparse_buf = (struct reparse_data_buffer *)
2677                         ((char *)ioctl_rsp +
2678                          le32_to_cpu(ioctl_rsp->OutputOffset));
2679                 plen = le32_to_cpu(ioctl_rsp->OutputCount);
2680
2681                 if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) >
2682                     rsp_iov[1].iov_len) {
2683                         cifs_tcon_dbg(VFS, "srv returned invalid ioctl len: %d\n",
2684                                  plen);
2685                         rc = -EIO;
2686                         goto querty_exit;
2687                 }
2688
2689                 rc = parse_reparse_point(reparse_buf, plen, target_path,
2690                                          cifs_sb);
2691                 goto querty_exit;
2692         }
2693
2694         if (!rc || !err_iov.iov_base) {
2695                 rc = -ENOENT;
2696                 goto querty_exit;
2697         }
2698
2699         err_buf = err_iov.iov_base;
2700         if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
2701             err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE) {
2702                 rc = -EINVAL;
2703                 goto querty_exit;
2704         }
2705
2706         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
2707         if (le32_to_cpu(symlink->SymLinkErrorTag) != SYMLINK_ERROR_TAG ||
2708             le32_to_cpu(symlink->ReparseTag) != IO_REPARSE_TAG_SYMLINK) {
2709                 rc = -EINVAL;
2710                 goto querty_exit;
2711         }
2712
2713         /* open must fail on symlink - reset rc */
2714         rc = 0;
2715         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
2716         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
2717         print_len = le16_to_cpu(symlink->PrintNameLength);
2718         print_offset = le16_to_cpu(symlink->PrintNameOffset);
2719
2720         if (err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
2721                 rc = -EINVAL;
2722                 goto querty_exit;
2723         }
2724
2725         if (err_iov.iov_len <
2726             SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
2727                 rc = -EINVAL;
2728                 goto querty_exit;
2729         }
2730
2731         *target_path = cifs_strndup_from_utf16(
2732                                 (char *)symlink->PathBuffer + sub_offset,
2733                                 sub_len, true, cifs_sb->local_nls);
2734         if (!(*target_path)) {
2735                 rc = -ENOMEM;
2736                 goto querty_exit;
2737         }
2738         convert_delimiter(*target_path, '/');
2739         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2740
2741  querty_exit:
2742         cifs_dbg(FYI, "query symlink rc %d\n", rc);
2743         kfree(utf16_path);
2744         SMB2_open_free(&rqst[0]);
2745         SMB2_ioctl_free(&rqst[1]);
2746         SMB2_close_free(&rqst[2]);
2747         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2748         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2749         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
2750         return rc;
2751 }
2752
2753 static struct cifs_ntsd *
2754 get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
2755                 const struct cifs_fid *cifsfid, u32 *pacllen)
2756 {
2757         struct cifs_ntsd *pntsd = NULL;
2758         unsigned int xid;
2759         int rc = -EOPNOTSUPP;
2760         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2761
2762         if (IS_ERR(tlink))
2763                 return ERR_CAST(tlink);
2764
2765         xid = get_xid();
2766         cifs_dbg(FYI, "trying to get acl\n");
2767
2768         rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
2769                             cifsfid->volatile_fid, (void **)&pntsd, pacllen);
2770         free_xid(xid);
2771
2772         cifs_put_tlink(tlink);
2773
2774         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
2775         if (rc)
2776                 return ERR_PTR(rc);
2777         return pntsd;
2778
2779 }
2780
2781 static struct cifs_ntsd *
2782 get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
2783                 const char *path, u32 *pacllen)
2784 {
2785         struct cifs_ntsd *pntsd = NULL;
2786         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2787         unsigned int xid;
2788         int rc;
2789         struct cifs_tcon *tcon;
2790         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2791         struct cifs_fid fid;
2792         struct cifs_open_parms oparms;
2793         __le16 *utf16_path;
2794
2795         cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
2796         if (IS_ERR(tlink))
2797                 return ERR_CAST(tlink);
2798
2799         tcon = tlink_tcon(tlink);
2800         xid = get_xid();
2801
2802         if (backup_cred(cifs_sb))
2803                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2804         else
2805                 oparms.create_options = 0;
2806
2807         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2808         if (!utf16_path) {
2809                 rc = -ENOMEM;
2810                 free_xid(xid);
2811                 return ERR_PTR(rc);
2812         }
2813
2814         oparms.tcon = tcon;
2815         oparms.desired_access = READ_CONTROL;
2816         oparms.disposition = FILE_OPEN;
2817         oparms.fid = &fid;
2818         oparms.reconnect = false;
2819
2820         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
2821         kfree(utf16_path);
2822         if (!rc) {
2823                 rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
2824                             fid.volatile_fid, (void **)&pntsd, pacllen);
2825                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2826         }
2827
2828         cifs_put_tlink(tlink);
2829         free_xid(xid);
2830
2831         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
2832         if (rc)
2833                 return ERR_PTR(rc);
2834         return pntsd;
2835 }
2836
2837 static int
2838 set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
2839                 struct inode *inode, const char *path, int aclflag)
2840 {
2841         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2842         unsigned int xid;
2843         int rc, access_flags = 0;
2844         struct cifs_tcon *tcon;
2845         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
2846         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
2847         struct cifs_fid fid;
2848         struct cifs_open_parms oparms;
2849         __le16 *utf16_path;
2850
2851         cifs_dbg(FYI, "set smb3 acl for path %s\n", path);
2852         if (IS_ERR(tlink))
2853                 return PTR_ERR(tlink);
2854
2855         tcon = tlink_tcon(tlink);
2856         xid = get_xid();
2857
2858         if (backup_cred(cifs_sb))
2859                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
2860         else
2861                 oparms.create_options = 0;
2862
2863         if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP)
2864                 access_flags = WRITE_OWNER;
2865         else
2866                 access_flags = WRITE_DAC;
2867
2868         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2869         if (!utf16_path) {
2870                 rc = -ENOMEM;
2871                 free_xid(xid);
2872                 return rc;
2873         }
2874
2875         oparms.tcon = tcon;
2876         oparms.desired_access = access_flags;
2877         oparms.disposition = FILE_OPEN;
2878         oparms.path = path;
2879         oparms.fid = &fid;
2880         oparms.reconnect = false;
2881
2882         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL);
2883         kfree(utf16_path);
2884         if (!rc) {
2885                 rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
2886                             fid.volatile_fid, pnntsd, acllen, aclflag);
2887                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2888         }
2889
2890         cifs_put_tlink(tlink);
2891         free_xid(xid);
2892         return rc;
2893 }
2894
2895 /* Retrieve an ACL from the server */
2896 static struct cifs_ntsd *
2897 get_smb2_acl(struct cifs_sb_info *cifs_sb,
2898                                       struct inode *inode, const char *path,
2899                                       u32 *pacllen)
2900 {
2901         struct cifs_ntsd *pntsd = NULL;
2902         struct cifsFileInfo *open_file = NULL;
2903
2904         if (inode)
2905                 open_file = find_readable_file(CIFS_I(inode), true);
2906         if (!open_file)
2907                 return get_smb2_acl_by_path(cifs_sb, path, pacllen);
2908
2909         pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen);
2910         cifsFileInfo_put(open_file);
2911         return pntsd;
2912 }
2913
2914 static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
2915                             loff_t offset, loff_t len, bool keep_size)
2916 {
2917         struct cifs_ses *ses = tcon->ses;
2918         struct inode *inode;
2919         struct cifsInodeInfo *cifsi;
2920         struct cifsFileInfo *cfile = file->private_data;
2921         struct file_zero_data_information fsctl_buf;
2922         long rc;
2923         unsigned int xid;
2924         __le64 eof;
2925
2926         xid = get_xid();
2927
2928         inode = d_inode(cfile->dentry);
2929         cifsi = CIFS_I(inode);
2930
2931         trace_smb3_zero_enter(xid, cfile->fid.persistent_fid, tcon->tid,
2932                               ses->Suid, offset, len);
2933
2934
2935         /* if file not oplocked can't be sure whether asking to extend size */
2936         if (!CIFS_CACHE_READ(cifsi))
2937                 if (keep_size == false) {
2938                         rc = -EOPNOTSUPP;
2939                         trace_smb3_zero_err(xid, cfile->fid.persistent_fid,
2940                                 tcon->tid, ses->Suid, offset, len, rc);
2941                         free_xid(xid);
2942                         return rc;
2943                 }
2944
2945         cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
2946
2947         fsctl_buf.FileOffset = cpu_to_le64(offset);
2948         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
2949
2950         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
2951                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA, true,
2952                         (char *)&fsctl_buf,
2953                         sizeof(struct file_zero_data_information),
2954                         0, NULL, NULL);
2955         if (rc)
2956                 goto zero_range_exit;
2957
2958         /*
2959          * do we also need to change the size of the file?
2960          */
2961         if (keep_size == false && i_size_read(inode) < offset + len) {
2962                 eof = cpu_to_le64(offset + len);
2963                 rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
2964                                   cfile->fid.volatile_fid, cfile->pid, &eof);
2965         }
2966
2967  zero_range_exit:
2968         free_xid(xid);
2969         if (rc)
2970                 trace_smb3_zero_err(xid, cfile->fid.persistent_fid, tcon->tid,
2971                               ses->Suid, offset, len, rc);
2972         else
2973                 trace_smb3_zero_done(xid, cfile->fid.persistent_fid, tcon->tid,
2974                               ses->Suid, offset, len);
2975         return rc;
2976 }
2977
2978 static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
2979                             loff_t offset, loff_t len)
2980 {
2981         struct inode *inode;
2982         struct cifsFileInfo *cfile = file->private_data;
2983         struct file_zero_data_information fsctl_buf;
2984         long rc;
2985         unsigned int xid;
2986         __u8 set_sparse = 1;
2987
2988         xid = get_xid();
2989
2990         inode = d_inode(cfile->dentry);
2991
2992         /* Need to make file sparse, if not already, before freeing range. */
2993         /* Consider adding equivalent for compressed since it could also work */
2994         if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse)) {
2995                 rc = -EOPNOTSUPP;
2996                 free_xid(xid);
2997                 return rc;
2998         }
2999
3000         cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
3001
3002         fsctl_buf.FileOffset = cpu_to_le64(offset);
3003         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
3004
3005         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3006                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
3007                         true /* is_fctl */, (char *)&fsctl_buf,
3008                         sizeof(struct file_zero_data_information),
3009                         CIFSMaxBufSize, NULL, NULL);
3010         free_xid(xid);
3011         return rc;
3012 }
3013
3014 static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
3015                             loff_t off, loff_t len, bool keep_size)
3016 {
3017         struct inode *inode;
3018         struct cifsInodeInfo *cifsi;
3019         struct cifsFileInfo *cfile = file->private_data;
3020         long rc = -EOPNOTSUPP;
3021         unsigned int xid;
3022         __le64 eof;
3023
3024         xid = get_xid();
3025
3026         inode = d_inode(cfile->dentry);
3027         cifsi = CIFS_I(inode);
3028
3029         trace_smb3_falloc_enter(xid, cfile->fid.persistent_fid, tcon->tid,
3030                                 tcon->ses->Suid, off, len);
3031         /* if file not oplocked can't be sure whether asking to extend size */
3032         if (!CIFS_CACHE_READ(cifsi))
3033                 if (keep_size == false) {
3034                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
3035                                 tcon->tid, tcon->ses->Suid, off, len, rc);
3036                         free_xid(xid);
3037                         return rc;
3038                 }
3039
3040         /*
3041          * Files are non-sparse by default so falloc may be a no-op
3042          * Must check if file sparse. If not sparse, and not extending
3043          * then no need to do anything since file already allocated
3044          */
3045         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
3046                 if (keep_size == true)
3047                         rc = 0;
3048                 /* check if extending file */
3049                 else if (i_size_read(inode) >= off + len)
3050                         /* not extending file and already not sparse */
3051                         rc = 0;
3052                 /* BB: in future add else clause to extend file */
3053                 else
3054                         rc = -EOPNOTSUPP;
3055                 if (rc)
3056                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
3057                                 tcon->tid, tcon->ses->Suid, off, len, rc);
3058                 else
3059                         trace_smb3_falloc_done(xid, cfile->fid.persistent_fid,
3060                                 tcon->tid, tcon->ses->Suid, off, len);
3061                 free_xid(xid);
3062                 return rc;
3063         }
3064
3065         if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
3066                 /*
3067                  * Check if falloc starts within first few pages of file
3068                  * and ends within a few pages of the end of file to
3069                  * ensure that most of file is being forced to be
3070                  * fallocated now. If so then setting whole file sparse
3071                  * ie potentially making a few extra pages at the beginning
3072                  * or end of the file non-sparse via set_sparse is harmless.
3073                  */
3074                 if ((off > 8192) || (off + len + 8192 < i_size_read(inode))) {
3075                         rc = -EOPNOTSUPP;
3076                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
3077                                 tcon->tid, tcon->ses->Suid, off, len, rc);
3078                         free_xid(xid);
3079                         return rc;
3080                 }
3081
3082                 smb2_set_sparse(xid, tcon, cfile, inode, false);
3083                 rc = 0;
3084         } else {
3085                 smb2_set_sparse(xid, tcon, cfile, inode, false);
3086                 rc = 0;
3087                 if (i_size_read(inode) < off + len) {
3088                         eof = cpu_to_le64(off + len);
3089                         rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
3090                                           cfile->fid.volatile_fid, cfile->pid,
3091                                           &eof);
3092                 }
3093         }
3094
3095         if (rc)
3096                 trace_smb3_falloc_err(xid, cfile->fid.persistent_fid, tcon->tid,
3097                                 tcon->ses->Suid, off, len, rc);
3098         else
3099                 trace_smb3_falloc_done(xid, cfile->fid.persistent_fid, tcon->tid,
3100                                 tcon->ses->Suid, off, len);
3101
3102         free_xid(xid);
3103         return rc;
3104 }
3105
3106 static loff_t smb3_llseek(struct file *file, struct cifs_tcon *tcon, loff_t offset, int whence)
3107 {
3108         struct cifsFileInfo *wrcfile, *cfile = file->private_data;
3109         struct cifsInodeInfo *cifsi;
3110         struct inode *inode;
3111         int rc = 0;
3112         struct file_allocated_range_buffer in_data, *out_data = NULL;
3113         u32 out_data_len;
3114         unsigned int xid;
3115
3116         if (whence != SEEK_HOLE && whence != SEEK_DATA)
3117                 return generic_file_llseek(file, offset, whence);
3118
3119         inode = d_inode(cfile->dentry);
3120         cifsi = CIFS_I(inode);
3121
3122         if (offset < 0 || offset >= i_size_read(inode))
3123                 return -ENXIO;
3124
3125         xid = get_xid();
3126         /*
3127          * We need to be sure that all dirty pages are written as they
3128          * might fill holes on the server.
3129          * Note that we also MUST flush any written pages since at least
3130          * some servers (Windows2016) will not reflect recent writes in
3131          * QUERY_ALLOCATED_RANGES until SMB2_flush is called.
3132          */
3133         wrcfile = find_writable_file(cifsi, false);
3134         if (wrcfile) {
3135                 filemap_write_and_wait(inode->i_mapping);
3136                 smb2_flush_file(xid, tcon, &wrcfile->fid);
3137                 cifsFileInfo_put(wrcfile);
3138         }
3139
3140         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE)) {
3141                 if (whence == SEEK_HOLE)
3142                         offset = i_size_read(inode);
3143                 goto lseek_exit;
3144         }
3145
3146         in_data.file_offset = cpu_to_le64(offset);
3147         in_data.length = cpu_to_le64(i_size_read(inode));
3148
3149         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3150                         cfile->fid.volatile_fid,
3151                         FSCTL_QUERY_ALLOCATED_RANGES, true,
3152                         (char *)&in_data, sizeof(in_data),
3153                         sizeof(struct file_allocated_range_buffer),
3154                         (char **)&out_data, &out_data_len);
3155         if (rc == -E2BIG)
3156                 rc = 0;
3157         if (rc)
3158                 goto lseek_exit;
3159
3160         if (whence == SEEK_HOLE && out_data_len == 0)
3161                 goto lseek_exit;
3162
3163         if (whence == SEEK_DATA && out_data_len == 0) {
3164                 rc = -ENXIO;
3165                 goto lseek_exit;
3166         }
3167
3168         if (out_data_len < sizeof(struct file_allocated_range_buffer)) {
3169                 rc = -EINVAL;
3170                 goto lseek_exit;
3171         }
3172         if (whence == SEEK_DATA) {
3173                 offset = le64_to_cpu(out_data->file_offset);
3174                 goto lseek_exit;
3175         }
3176         if (offset < le64_to_cpu(out_data->file_offset))
3177                 goto lseek_exit;
3178
3179         offset = le64_to_cpu(out_data->file_offset) + le64_to_cpu(out_data->length);
3180
3181  lseek_exit:
3182         free_xid(xid);
3183         kfree(out_data);
3184         if (!rc)
3185                 return vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
3186         else
3187                 return rc;
3188 }
3189
3190 static int smb3_fiemap(struct cifs_tcon *tcon,
3191                        struct cifsFileInfo *cfile,
3192                        struct fiemap_extent_info *fei, u64 start, u64 len)
3193 {
3194         unsigned int xid;
3195         struct file_allocated_range_buffer in_data, *out_data;
3196         u32 out_data_len;
3197         int i, num, rc, flags, last_blob;
3198         u64 next;
3199
3200         if (fiemap_check_flags(fei, FIEMAP_FLAG_SYNC))
3201                 return -EBADR;
3202
3203         xid = get_xid();
3204  again:
3205         in_data.file_offset = cpu_to_le64(start);
3206         in_data.length = cpu_to_le64(len);
3207
3208         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3209                         cfile->fid.volatile_fid,
3210                         FSCTL_QUERY_ALLOCATED_RANGES, true,
3211                         (char *)&in_data, sizeof(in_data),
3212                         1024 * sizeof(struct file_allocated_range_buffer),
3213                         (char **)&out_data, &out_data_len);
3214         if (rc == -E2BIG) {
3215                 last_blob = 0;
3216                 rc = 0;
3217         } else
3218                 last_blob = 1;
3219         if (rc)
3220                 goto out;
3221
3222         if (out_data_len < sizeof(struct file_allocated_range_buffer)) {
3223                 rc = -EINVAL;
3224                 goto out;
3225         }
3226         if (out_data_len % sizeof(struct file_allocated_range_buffer)) {
3227                 rc = -EINVAL;
3228                 goto out;
3229         }
3230
3231         num = out_data_len / sizeof(struct file_allocated_range_buffer);
3232         for (i = 0; i < num; i++) {
3233                 flags = 0;
3234                 if (i == num - 1 && last_blob)
3235                         flags |= FIEMAP_EXTENT_LAST;
3236
3237                 rc = fiemap_fill_next_extent(fei,
3238                                 le64_to_cpu(out_data[i].file_offset),
3239                                 le64_to_cpu(out_data[i].file_offset),
3240                                 le64_to_cpu(out_data[i].length),
3241                                 flags);
3242                 if (rc < 0)
3243                         goto out;
3244                 if (rc == 1) {
3245                         rc = 0;
3246                         goto out;
3247                 }
3248         }
3249
3250         if (!last_blob) {
3251                 next = le64_to_cpu(out_data[num - 1].file_offset) +
3252                   le64_to_cpu(out_data[num - 1].length);
3253                 len = len - (next - start);
3254                 start = next;
3255                 goto again;
3256         }
3257
3258  out:
3259         free_xid(xid);
3260         kfree(out_data);
3261         return rc;
3262 }
3263
3264 static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
3265                            loff_t off, loff_t len)
3266 {
3267         /* KEEP_SIZE already checked for by do_fallocate */
3268         if (mode & FALLOC_FL_PUNCH_HOLE)
3269                 return smb3_punch_hole(file, tcon, off, len);
3270         else if (mode & FALLOC_FL_ZERO_RANGE) {
3271                 if (mode & FALLOC_FL_KEEP_SIZE)
3272                         return smb3_zero_range(file, tcon, off, len, true);
3273                 return smb3_zero_range(file, tcon, off, len, false);
3274         } else if (mode == FALLOC_FL_KEEP_SIZE)
3275                 return smb3_simple_falloc(file, tcon, off, len, true);
3276         else if (mode == 0)
3277                 return smb3_simple_falloc(file, tcon, off, len, false);
3278
3279         return -EOPNOTSUPP;
3280 }
3281
3282 static void
3283 smb2_downgrade_oplock(struct TCP_Server_Info *server,
3284                         struct cifsInodeInfo *cinode, bool set_level2)
3285 {
3286         if (set_level2)
3287                 server->ops->set_oplock_level(cinode, SMB2_OPLOCK_LEVEL_II,
3288                                                 0, NULL);
3289         else
3290                 server->ops->set_oplock_level(cinode, 0, 0, NULL);
3291 }
3292
3293 static void
3294 smb21_downgrade_oplock(struct TCP_Server_Info *server,
3295                        struct cifsInodeInfo *cinode, bool set_level2)
3296 {
3297         server->ops->set_oplock_level(cinode,
3298                                       set_level2 ? SMB2_LEASE_READ_CACHING_HE :
3299                                       0, 0, NULL);
3300 }
3301
3302 static void
3303 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3304                       unsigned int epoch, bool *purge_cache)
3305 {
3306         oplock &= 0xFF;
3307         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
3308                 return;
3309         if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
3310                 cinode->oplock = CIFS_CACHE_RHW_FLG;
3311                 cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
3312                          &cinode->vfs_inode);
3313         } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
3314                 cinode->oplock = CIFS_CACHE_RW_FLG;
3315                 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
3316                          &cinode->vfs_inode);
3317         } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
3318                 cinode->oplock = CIFS_CACHE_READ_FLG;
3319                 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
3320                          &cinode->vfs_inode);
3321         } else
3322                 cinode->oplock = 0;
3323 }
3324
3325 static void
3326 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3327                        unsigned int epoch, bool *purge_cache)
3328 {
3329         char message[5] = {0};
3330         unsigned int new_oplock = 0;
3331
3332         oplock &= 0xFF;
3333         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
3334                 return;
3335
3336         /* Check if the server granted an oplock rather than a lease */
3337         if (oplock & SMB2_OPLOCK_LEVEL_EXCLUSIVE)
3338                 return smb2_set_oplock_level(cinode, oplock, epoch,
3339                                              purge_cache);
3340
3341         if (oplock & SMB2_LEASE_READ_CACHING_HE) {
3342                 new_oplock |= CIFS_CACHE_READ_FLG;
3343                 strcat(message, "R");
3344         }
3345         if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
3346                 new_oplock |= CIFS_CACHE_HANDLE_FLG;
3347                 strcat(message, "H");
3348         }
3349         if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
3350                 new_oplock |= CIFS_CACHE_WRITE_FLG;
3351                 strcat(message, "W");
3352         }
3353         if (!new_oplock)
3354                 strncpy(message, "None", sizeof(message));
3355
3356         cinode->oplock = new_oplock;
3357         cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
3358                  &cinode->vfs_inode);
3359 }
3360
3361 static void
3362 smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3363                       unsigned int epoch, bool *purge_cache)
3364 {
3365         unsigned int old_oplock = cinode->oplock;
3366
3367         smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
3368
3369         if (purge_cache) {
3370                 *purge_cache = false;
3371                 if (old_oplock == CIFS_CACHE_READ_FLG) {
3372                         if (cinode->oplock == CIFS_CACHE_READ_FLG &&
3373                             (epoch - cinode->epoch > 0))
3374                                 *purge_cache = true;
3375                         else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
3376                                  (epoch - cinode->epoch > 1))
3377                                 *purge_cache = true;
3378                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
3379                                  (epoch - cinode->epoch > 1))
3380                                 *purge_cache = true;
3381                         else if (cinode->oplock == 0 &&
3382                                  (epoch - cinode->epoch > 0))
3383                                 *purge_cache = true;
3384                 } else if (old_oplock == CIFS_CACHE_RH_FLG) {
3385                         if (cinode->oplock == CIFS_CACHE_RH_FLG &&
3386                             (epoch - cinode->epoch > 0))
3387                                 *purge_cache = true;
3388                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
3389                                  (epoch - cinode->epoch > 1))
3390                                 *purge_cache = true;
3391                 }
3392                 cinode->epoch = epoch;
3393         }
3394 }
3395
3396 static bool
3397 smb2_is_read_op(__u32 oplock)
3398 {
3399         return oplock == SMB2_OPLOCK_LEVEL_II;
3400 }
3401
3402 static bool
3403 smb21_is_read_op(__u32 oplock)
3404 {
3405         return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
3406                !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
3407 }
3408
3409 static __le32
3410 map_oplock_to_lease(u8 oplock)
3411 {
3412         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
3413                 return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
3414         else if (oplock == SMB2_OPLOCK_LEVEL_II)
3415                 return SMB2_LEASE_READ_CACHING;
3416         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
3417                 return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
3418                        SMB2_LEASE_WRITE_CACHING;
3419         return 0;
3420 }
3421
3422 static char *
3423 smb2_create_lease_buf(u8 *lease_key, u8 oplock)
3424 {
3425         struct create_lease *buf;
3426
3427         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
3428         if (!buf)
3429                 return NULL;
3430
3431         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
3432         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
3433
3434         buf->ccontext.DataOffset = cpu_to_le16(offsetof
3435                                         (struct create_lease, lcontext));
3436         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
3437         buf->ccontext.NameOffset = cpu_to_le16(offsetof
3438                                 (struct create_lease, Name));
3439         buf->ccontext.NameLength = cpu_to_le16(4);
3440         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
3441         buf->Name[0] = 'R';
3442         buf->Name[1] = 'q';
3443         buf->Name[2] = 'L';
3444         buf->Name[3] = 's';
3445         return (char *)buf;
3446 }
3447
3448 static char *
3449 smb3_create_lease_buf(u8 *lease_key, u8 oplock)
3450 {
3451         struct create_lease_v2 *buf;
3452
3453         buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
3454         if (!buf)
3455                 return NULL;
3456
3457         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
3458         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
3459
3460         buf->ccontext.DataOffset = cpu_to_le16(offsetof
3461                                         (struct create_lease_v2, lcontext));
3462         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
3463         buf->ccontext.NameOffset = cpu_to_le16(offsetof
3464                                 (struct create_lease_v2, Name));
3465         buf->ccontext.NameLength = cpu_to_le16(4);
3466         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
3467         buf->Name[0] = 'R';
3468         buf->Name[1] = 'q';
3469         buf->Name[2] = 'L';
3470         buf->Name[3] = 's';
3471         return (char *)buf;
3472 }
3473
3474 static __u8
3475 smb2_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
3476 {
3477         struct create_lease *lc = (struct create_lease *)buf;
3478
3479         *epoch = 0; /* not used */
3480         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
3481                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
3482         return le32_to_cpu(lc->lcontext.LeaseState);
3483 }
3484
3485 static __u8
3486 smb3_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
3487 {
3488         struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
3489
3490         *epoch = le16_to_cpu(lc->lcontext.Epoch);
3491         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
3492                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
3493         if (lease_key)
3494                 memcpy(lease_key, &lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
3495         return le32_to_cpu(lc->lcontext.LeaseState);
3496 }
3497
3498 static unsigned int
3499 smb2_wp_retry_size(struct inode *inode)
3500 {
3501         return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
3502                      SMB2_MAX_BUFFER_SIZE);
3503 }
3504
3505 static bool
3506 smb2_dir_needs_close(struct cifsFileInfo *cfile)
3507 {
3508         return !cfile->invalidHandle;
3509 }
3510
3511 static void
3512 fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, unsigned int orig_len,
3513                    struct smb_rqst *old_rq, __le16 cipher_type)
3514 {
3515         struct smb2_sync_hdr *shdr =
3516                         (struct smb2_sync_hdr *)old_rq->rq_iov[0].iov_base;
3517
3518         memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
3519         tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
3520         tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
3521         tr_hdr->Flags = cpu_to_le16(0x01);
3522         if (cipher_type == SMB2_ENCRYPTION_AES128_GCM)
3523                 get_random_bytes(&tr_hdr->Nonce, SMB3_AES128GCM_NONCE);
3524         else
3525                 get_random_bytes(&tr_hdr->Nonce, SMB3_AES128CCM_NONCE);
3526         memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
3527 }
3528
3529 /* We can not use the normal sg_set_buf() as we will sometimes pass a
3530  * stack object as buf.
3531  */
3532 static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf,
3533                                    unsigned int buflen)
3534 {
3535         void *addr;
3536         /*
3537          * VMAP_STACK (at least) puts stack into the vmalloc address space
3538          */
3539         if (is_vmalloc_addr(buf))
3540                 addr = vmalloc_to_page(buf);
3541         else
3542                 addr = virt_to_page(buf);
3543         sg_set_page(sg, addr, buflen, offset_in_page(buf));
3544 }
3545
3546 /* Assumes the first rqst has a transform header as the first iov.
3547  * I.e.
3548  * rqst[0].rq_iov[0]  is transform header
3549  * rqst[0].rq_iov[1+] data to be encrypted/decrypted
3550  * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
3551  */
3552 static struct scatterlist *
3553 init_sg(int num_rqst, struct smb_rqst *rqst, u8 *sign)
3554 {
3555         unsigned int sg_len;
3556         struct scatterlist *sg;
3557         unsigned int i;
3558         unsigned int j;
3559         unsigned int idx = 0;
3560         int skip;
3561
3562         sg_len = 1;
3563         for (i = 0; i < num_rqst; i++)
3564                 sg_len += rqst[i].rq_nvec + rqst[i].rq_npages;
3565
3566         sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
3567         if (!sg)
3568                 return NULL;
3569
3570         sg_init_table(sg, sg_len);
3571         for (i = 0; i < num_rqst; i++) {
3572                 for (j = 0; j < rqst[i].rq_nvec; j++) {
3573                         /*
3574                          * The first rqst has a transform header where the
3575                          * first 20 bytes are not part of the encrypted blob
3576                          */
3577                         skip = (i == 0) && (j == 0) ? 20 : 0;
3578                         smb2_sg_set_buf(&sg[idx++],
3579                                         rqst[i].rq_iov[j].iov_base + skip,
3580                                         rqst[i].rq_iov[j].iov_len - skip);
3581                         }
3582
3583                 for (j = 0; j < rqst[i].rq_npages; j++) {
3584                         unsigned int len, offset;
3585
3586                         rqst_page_get_length(&rqst[i], j, &len, &offset);
3587                         sg_set_page(&sg[idx++], rqst[i].rq_pages[j], len, offset);
3588                 }
3589         }
3590         smb2_sg_set_buf(&sg[idx], sign, SMB2_SIGNATURE_SIZE);
3591         return sg;
3592 }
3593
3594 static int
3595 smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
3596 {
3597         struct cifs_ses *ses;
3598         u8 *ses_enc_key;
3599
3600         spin_lock(&cifs_tcp_ses_lock);
3601         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3602                 if (ses->Suid != ses_id)
3603                         continue;
3604                 ses_enc_key = enc ? ses->smb3encryptionkey :
3605                                                         ses->smb3decryptionkey;
3606                 memcpy(key, ses_enc_key, SMB3_SIGN_KEY_SIZE);
3607                 spin_unlock(&cifs_tcp_ses_lock);
3608                 return 0;
3609         }
3610         spin_unlock(&cifs_tcp_ses_lock);
3611
3612         return 1;
3613 }
3614 /*
3615  * Encrypt or decrypt @rqst message. @rqst[0] has the following format:
3616  * iov[0]   - transform header (associate data),
3617  * iov[1-N] - SMB2 header and pages - data to encrypt.
3618  * On success return encrypted data in iov[1-N] and pages, leave iov[0]
3619  * untouched.
3620  */
3621 static int
3622 crypt_message(struct TCP_Server_Info *server, int num_rqst,
3623               struct smb_rqst *rqst, int enc)
3624 {
3625         struct smb2_transform_hdr *tr_hdr =
3626                 (struct smb2_transform_hdr *)rqst[0].rq_iov[0].iov_base;
3627         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
3628         int rc = 0;
3629         struct scatterlist *sg;
3630         u8 sign[SMB2_SIGNATURE_SIZE] = {};
3631         u8 key[SMB3_SIGN_KEY_SIZE];
3632         struct aead_request *req;
3633         char *iv;
3634         unsigned int iv_len;
3635         DECLARE_CRYPTO_WAIT(wait);
3636         struct crypto_aead *tfm;
3637         unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
3638
3639         rc = smb2_get_enc_key(server, tr_hdr->SessionId, enc, key);
3640         if (rc) {
3641                 cifs_server_dbg(VFS, "%s: Could not get %scryption key\n", __func__,
3642                          enc ? "en" : "de");
3643                 return 0;
3644         }
3645
3646         rc = smb3_crypto_aead_allocate(server);
3647         if (rc) {
3648                 cifs_server_dbg(VFS, "%s: crypto alloc failed\n", __func__);
3649                 return rc;
3650         }
3651
3652         tfm = enc ? server->secmech.ccmaesencrypt :
3653                                                 server->secmech.ccmaesdecrypt;
3654         rc = crypto_aead_setkey(tfm, key, SMB3_SIGN_KEY_SIZE);
3655         if (rc) {
3656                 cifs_server_dbg(VFS, "%s: Failed to set aead key %d\n", __func__, rc);
3657                 return rc;
3658         }
3659
3660         rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
3661         if (rc) {
3662                 cifs_server_dbg(VFS, "%s: Failed to set authsize %d\n", __func__, rc);
3663                 return rc;
3664         }
3665
3666         req = aead_request_alloc(tfm, GFP_KERNEL);
3667         if (!req) {
3668                 cifs_server_dbg(VFS, "%s: Failed to alloc aead request\n", __func__);
3669                 return -ENOMEM;
3670         }
3671
3672         if (!enc) {
3673                 memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
3674                 crypt_len += SMB2_SIGNATURE_SIZE;
3675         }
3676
3677         sg = init_sg(num_rqst, rqst, sign);
3678         if (!sg) {
3679                 cifs_server_dbg(VFS, "%s: Failed to init sg\n", __func__);
3680                 rc = -ENOMEM;
3681                 goto free_req;
3682         }
3683
3684         iv_len = crypto_aead_ivsize(tfm);
3685         iv = kzalloc(iv_len, GFP_KERNEL);
3686         if (!iv) {
3687                 cifs_server_dbg(VFS, "%s: Failed to alloc iv\n", __func__);
3688                 rc = -ENOMEM;
3689                 goto free_sg;
3690         }
3691
3692         if (server->cipher_type == SMB2_ENCRYPTION_AES128_GCM)
3693                 memcpy(iv, (char *)tr_hdr->Nonce, SMB3_AES128GCM_NONCE);
3694         else {
3695                 iv[0] = 3;
3696                 memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES128CCM_NONCE);
3697         }
3698
3699         aead_request_set_crypt(req, sg, sg, crypt_len, iv);
3700         aead_request_set_ad(req, assoc_data_len);
3701
3702         aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
3703                                   crypto_req_done, &wait);
3704
3705         rc = crypto_wait_req(enc ? crypto_aead_encrypt(req)
3706                                 : crypto_aead_decrypt(req), &wait);
3707
3708         if (!rc && enc)
3709                 memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
3710
3711         kfree(iv);
3712 free_sg:
3713         kfree(sg);
3714 free_req:
3715         kfree(req);
3716         return rc;
3717 }
3718
3719 void
3720 smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst)
3721 {
3722         int i, j;
3723
3724         for (i = 0; i < num_rqst; i++) {
3725                 if (rqst[i].rq_pages) {
3726                         for (j = rqst[i].rq_npages - 1; j >= 0; j--)
3727                                 put_page(rqst[i].rq_pages[j]);
3728                         kfree(rqst[i].rq_pages);
3729                 }
3730         }
3731 }
3732
3733 /*
3734  * This function will initialize new_rq and encrypt the content.
3735  * The first entry, new_rq[0], only contains a single iov which contains
3736  * a smb2_transform_hdr and is pre-allocated by the caller.
3737  * This function then populates new_rq[1+] with the content from olq_rq[0+].
3738  *
3739  * The end result is an array of smb_rqst structures where the first structure
3740  * only contains a single iov for the transform header which we then can pass
3741  * to crypt_message().
3742  *
3743  * new_rq[0].rq_iov[0] :  smb2_transform_hdr pre-allocated by the caller
3744  * new_rq[1+].rq_iov[*] == old_rq[0+].rq_iov[*] : SMB2/3 requests
3745  */
3746 static int
3747 smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
3748                        struct smb_rqst *new_rq, struct smb_rqst *old_rq)
3749 {
3750         struct page **pages;
3751         struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
3752         unsigned int npages;
3753         unsigned int orig_len = 0;
3754         int i, j;
3755         int rc = -ENOMEM;
3756
3757         for (i = 1; i < num_rqst; i++) {
3758                 npages = old_rq[i - 1].rq_npages;
3759                 pages = kmalloc_array(npages, sizeof(struct page *),
3760                                       GFP_KERNEL);
3761                 if (!pages)
3762                         goto err_free;
3763
3764                 new_rq[i].rq_pages = pages;
3765                 new_rq[i].rq_npages = npages;
3766                 new_rq[i].rq_offset = old_rq[i - 1].rq_offset;
3767                 new_rq[i].rq_pagesz = old_rq[i - 1].rq_pagesz;
3768                 new_rq[i].rq_tailsz = old_rq[i - 1].rq_tailsz;
3769                 new_rq[i].rq_iov = old_rq[i - 1].rq_iov;
3770                 new_rq[i].rq_nvec = old_rq[i - 1].rq_nvec;
3771
3772                 orig_len += smb_rqst_len(server, &old_rq[i - 1]);
3773
3774                 for (j = 0; j < npages; j++) {
3775                         pages[j] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
3776                         if (!pages[j])
3777                                 goto err_free;
3778                 }
3779
3780                 /* copy pages form the old */
3781                 for (j = 0; j < npages; j++) {
3782                         char *dst, *src;
3783                         unsigned int offset, len;
3784
3785                         rqst_page_get_length(&new_rq[i], j, &len, &offset);
3786
3787                         dst = (char *) kmap(new_rq[i].rq_pages[j]) + offset;
3788                         src = (char *) kmap(old_rq[i - 1].rq_pages[j]) + offset;
3789
3790                         memcpy(dst, src, len);
3791                         kunmap(new_rq[i].rq_pages[j]);
3792                         kunmap(old_rq[i - 1].rq_pages[j]);
3793                 }
3794         }
3795
3796         /* fill the 1st iov with a transform header */
3797         fill_transform_hdr(tr_hdr, orig_len, old_rq, server->cipher_type);
3798
3799         rc = crypt_message(server, num_rqst, new_rq, 1);
3800         cifs_dbg(FYI, "Encrypt message returned %d\n", rc);
3801         if (rc)
3802                 goto err_free;
3803
3804         return rc;
3805
3806 err_free:
3807         smb3_free_compound_rqst(num_rqst - 1, &new_rq[1]);
3808         return rc;
3809 }
3810
3811 static int
3812 smb3_is_transform_hdr(void *buf)
3813 {
3814         struct smb2_transform_hdr *trhdr = buf;
3815
3816         return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
3817 }
3818
3819 static int
3820 decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
3821                  unsigned int buf_data_size, struct page **pages,
3822                  unsigned int npages, unsigned int page_data_size)
3823 {
3824         struct kvec iov[2];
3825         struct smb_rqst rqst = {NULL};
3826         int rc;
3827
3828         iov[0].iov_base = buf;
3829         iov[0].iov_len = sizeof(struct smb2_transform_hdr);
3830         iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
3831         iov[1].iov_len = buf_data_size;
3832
3833         rqst.rq_iov = iov;
3834         rqst.rq_nvec = 2;
3835         rqst.rq_pages = pages;
3836         rqst.rq_npages = npages;
3837         rqst.rq_pagesz = PAGE_SIZE;
3838         rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
3839
3840         rc = crypt_message(server, 1, &rqst, 0);
3841         cifs_dbg(FYI, "Decrypt message returned %d\n", rc);
3842
3843         if (rc)
3844                 return rc;
3845
3846         memmove(buf, iov[1].iov_base, buf_data_size);
3847
3848         server->total_read = buf_data_size + page_data_size;
3849
3850         return rc;
3851 }
3852
3853 static int
3854 read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
3855                      unsigned int npages, unsigned int len)
3856 {
3857         int i;
3858         int length;
3859
3860         for (i = 0; i < npages; i++) {
3861                 struct page *page = pages[i];
3862                 size_t n;
3863
3864                 n = len;
3865                 if (len >= PAGE_SIZE) {
3866                         /* enough data to fill the page */
3867                         n = PAGE_SIZE;
3868                         len -= n;
3869                 } else {
3870                         zero_user(page, len, PAGE_SIZE - len);
3871                         len = 0;
3872                 }
3873                 length = cifs_read_page_from_socket(server, page, 0, n);
3874                 if (length < 0)
3875                         return length;
3876                 server->total_read += length;
3877         }
3878
3879         return 0;
3880 }
3881
3882 static int
3883 init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
3884                unsigned int cur_off, struct bio_vec **page_vec)
3885 {
3886         struct bio_vec *bvec;
3887         int i;
3888
3889         bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
3890         if (!bvec)
3891                 return -ENOMEM;
3892
3893         for (i = 0; i < npages; i++) {
3894                 bvec[i].bv_page = pages[i];
3895                 bvec[i].bv_offset = (i == 0) ? cur_off : 0;
3896                 bvec[i].bv_len = min_t(unsigned int, PAGE_SIZE, data_size);
3897                 data_size -= bvec[i].bv_len;
3898         }
3899
3900         if (data_size != 0) {
3901                 cifs_dbg(VFS, "%s: something went wrong\n", __func__);
3902                 kfree(bvec);
3903                 return -EIO;
3904         }
3905
3906         *page_vec = bvec;
3907         return 0;
3908 }
3909
3910 static int
3911 handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
3912                  char *buf, unsigned int buf_len, struct page **pages,
3913                  unsigned int npages, unsigned int page_data_size)
3914 {
3915         unsigned int data_offset;
3916         unsigned int data_len;
3917         unsigned int cur_off;
3918         unsigned int cur_page_idx;
3919         unsigned int pad_len;
3920         struct cifs_readdata *rdata = mid->callback_data;
3921         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
3922         struct bio_vec *bvec = NULL;
3923         struct iov_iter iter;
3924         struct kvec iov;
3925         int length;
3926         bool use_rdma_mr = false;
3927
3928         if (shdr->Command != SMB2_READ) {
3929                 cifs_server_dbg(VFS, "only big read responses are supported\n");
3930                 return -ENOTSUPP;
3931         }
3932
3933         if (server->ops->is_session_expired &&
3934             server->ops->is_session_expired(buf)) {
3935                 cifs_reconnect(server);
3936                 wake_up(&server->response_q);
3937                 return -1;
3938         }
3939
3940         if (server->ops->is_status_pending &&
3941                         server->ops->is_status_pending(buf, server))
3942                 return -1;
3943
3944         /* set up first two iov to get credits */
3945         rdata->iov[0].iov_base = buf;
3946         rdata->iov[0].iov_len = 0;
3947         rdata->iov[1].iov_base = buf;
3948         rdata->iov[1].iov_len =
3949                 min_t(unsigned int, buf_len, server->vals->read_rsp_size);
3950         cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
3951                  rdata->iov[0].iov_base, rdata->iov[0].iov_len);
3952         cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
3953                  rdata->iov[1].iov_base, rdata->iov[1].iov_len);
3954
3955         rdata->result = server->ops->map_error(buf, true);
3956         if (rdata->result != 0) {
3957                 cifs_dbg(FYI, "%s: server returned error %d\n",
3958                          __func__, rdata->result);
3959                 /* normal error on read response */
3960                 dequeue_mid(mid, false);
3961                 return 0;
3962         }
3963
3964         data_offset = server->ops->read_data_offset(buf);
3965 #ifdef CONFIG_CIFS_SMB_DIRECT
3966         use_rdma_mr = rdata->mr;
3967 #endif
3968         data_len = server->ops->read_data_length(buf, use_rdma_mr);
3969
3970         if (data_offset < server->vals->read_rsp_size) {
3971                 /*
3972                  * win2k8 sometimes sends an offset of 0 when the read
3973                  * is beyond the EOF. Treat it as if the data starts just after
3974                  * the header.
3975                  */
3976                 cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
3977                          __func__, data_offset);
3978                 data_offset = server->vals->read_rsp_size;
3979         } else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
3980                 /* data_offset is beyond the end of smallbuf */
3981                 cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
3982                          __func__, data_offset);
3983                 rdata->result = -EIO;
3984                 dequeue_mid(mid, rdata->result);
3985                 return 0;
3986         }
3987
3988         pad_len = data_offset - server->vals->read_rsp_size;
3989
3990         if (buf_len <= data_offset) {
3991                 /* read response payload is in pages */
3992                 cur_page_idx = pad_len / PAGE_SIZE;
3993                 cur_off = pad_len % PAGE_SIZE;
3994
3995                 if (cur_page_idx != 0) {
3996                         /* data offset is beyond the 1st page of response */
3997                         cifs_dbg(FYI, "%s: data offset (%u) beyond 1st page of response\n",
3998                                  __func__, data_offset);
3999                         rdata->result = -EIO;
4000                         dequeue_mid(mid, rdata->result);
4001                         return 0;
4002                 }
4003
4004                 if (data_len > page_data_size - pad_len) {
4005                         /* data_len is corrupt -- discard frame */
4006                         rdata->result = -EIO;
4007                         dequeue_mid(mid, rdata->result);
4008                         return 0;
4009                 }
4010
4011                 rdata->result = init_read_bvec(pages, npages, page_data_size,
4012                                                cur_off, &bvec);
4013                 if (rdata->result != 0) {
4014                         dequeue_mid(mid, rdata->result);
4015                         return 0;
4016                 }
4017
4018                 iov_iter_bvec(&iter, WRITE, bvec, npages, data_len);
4019         } else if (buf_len >= data_offset + data_len) {
4020                 /* read response payload is in buf */
4021                 WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
4022                 iov.iov_base = buf + data_offset;
4023                 iov.iov_len = data_len;
4024                 iov_iter_kvec(&iter, WRITE, &iov, 1, data_len);
4025         } else {
4026                 /* read response payload cannot be in both buf and pages */
4027                 WARN_ONCE(1, "buf can not contain only a part of read data");
4028                 rdata->result = -EIO;
4029                 dequeue_mid(mid, rdata->result);
4030                 return 0;
4031         }
4032
4033         length = rdata->copy_into_pages(server, rdata, &iter);
4034
4035         kfree(bvec);
4036
4037         if (length < 0)
4038                 return length;
4039
4040         dequeue_mid(mid, false);
4041         return length;
4042 }
4043
4044 struct smb2_decrypt_work {
4045         struct work_struct decrypt;
4046         struct TCP_Server_Info *server;
4047         struct page **ppages;
4048         char *buf;
4049         unsigned int npages;
4050         unsigned int len;
4051 };
4052
4053
4054 static void smb2_decrypt_offload(struct work_struct *work)
4055 {
4056         struct smb2_decrypt_work *dw = container_of(work,
4057                                 struct smb2_decrypt_work, decrypt);
4058         int i, rc;
4059         struct mid_q_entry *mid;
4060
4061         rc = decrypt_raw_data(dw->server, dw->buf, dw->server->vals->read_rsp_size,
4062                               dw->ppages, dw->npages, dw->len);
4063         if (rc) {
4064                 cifs_dbg(VFS, "error decrypting rc=%d\n", rc);
4065                 goto free_pages;
4066         }
4067
4068         dw->server->lstrp = jiffies;
4069         mid = smb2_find_mid(dw->server, dw->buf);
4070         if (mid == NULL)
4071                 cifs_dbg(FYI, "mid not found\n");
4072         else {
4073                 mid->decrypted = true;
4074                 rc = handle_read_data(dw->server, mid, dw->buf,
4075                                       dw->server->vals->read_rsp_size,
4076                                       dw->ppages, dw->npages, dw->len);
4077                 mid->callback(mid);
4078                 cifs_mid_q_entry_release(mid);
4079         }
4080
4081 free_pages:
4082         for (i = dw->npages-1; i >= 0; i--)
4083                 put_page(dw->ppages[i]);
4084
4085         kfree(dw->ppages);
4086         cifs_small_buf_release(dw->buf);
4087 }
4088
4089
4090 static int
4091 receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid,
4092                        int *num_mids)
4093 {
4094         char *buf = server->smallbuf;
4095         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
4096         unsigned int npages;
4097         struct page **pages;
4098         unsigned int len;
4099         unsigned int buflen = server->pdu_size;
4100         int rc;
4101         int i = 0;
4102         struct smb2_decrypt_work *dw;
4103
4104         *num_mids = 1;
4105         len = min_t(unsigned int, buflen, server->vals->read_rsp_size +
4106                 sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
4107
4108         rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
4109         if (rc < 0)
4110                 return rc;
4111         server->total_read += rc;
4112
4113         len = le32_to_cpu(tr_hdr->OriginalMessageSize) -
4114                 server->vals->read_rsp_size;
4115         npages = DIV_ROUND_UP(len, PAGE_SIZE);
4116
4117         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
4118         if (!pages) {
4119                 rc = -ENOMEM;
4120                 goto discard_data;
4121         }
4122
4123         for (; i < npages; i++) {
4124                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
4125                 if (!pages[i]) {
4126                         rc = -ENOMEM;
4127                         goto discard_data;
4128                 }
4129         }
4130
4131         /* read read data into pages */
4132         rc = read_data_into_pages(server, pages, npages, len);
4133         if (rc)
4134                 goto free_pages;
4135
4136         rc = cifs_discard_remaining_data(server);
4137         if (rc)
4138                 goto free_pages;
4139
4140         /*
4141          * For large reads, offload to different thread for better performance,
4142          * use more cores decrypting which can be expensive
4143          */
4144
4145         if ((server->min_offload) && (server->in_flight > 1) &&
4146             (server->pdu_size >= server->min_offload)) {
4147                 dw = kmalloc(sizeof(struct smb2_decrypt_work), GFP_KERNEL);
4148                 if (dw == NULL)
4149                         goto non_offloaded_decrypt;
4150
4151                 dw->buf = server->smallbuf;
4152                 server->smallbuf = (char *)cifs_small_buf_get();
4153
4154                 INIT_WORK(&dw->decrypt, smb2_decrypt_offload);
4155
4156                 dw->npages = npages;
4157                 dw->server = server;
4158                 dw->ppages = pages;
4159                 dw->len = len;
4160                 queue_work(cifsiod_wq, &dw->decrypt);
4161                 *num_mids = 0; /* worker thread takes care of finding mid */
4162                 return -1;
4163         }
4164
4165 non_offloaded_decrypt:
4166         rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size,
4167                               pages, npages, len);
4168         if (rc)
4169                 goto free_pages;
4170
4171         *mid = smb2_find_mid(server, buf);
4172         if (*mid == NULL)
4173                 cifs_dbg(FYI, "mid not found\n");
4174         else {
4175                 cifs_dbg(FYI, "mid found\n");
4176                 (*mid)->decrypted = true;
4177                 rc = handle_read_data(server, *mid, buf,
4178                                       server->vals->read_rsp_size,
4179                                       pages, npages, len);
4180         }
4181
4182 free_pages:
4183         for (i = i - 1; i >= 0; i--)
4184                 put_page(pages[i]);
4185         kfree(pages);
4186         return rc;
4187 discard_data:
4188         cifs_discard_remaining_data(server);
4189         goto free_pages;
4190 }
4191
4192 static int
4193 receive_encrypted_standard(struct TCP_Server_Info *server,
4194                            struct mid_q_entry **mids, char **bufs,
4195                            int *num_mids)
4196 {
4197         int ret, length;
4198         char *buf = server->smallbuf;
4199         struct smb2_sync_hdr *shdr;
4200         unsigned int pdu_length = server->pdu_size;
4201         unsigned int buf_size;
4202         struct mid_q_entry *mid_entry;
4203         int next_is_large;
4204         char *next_buffer = NULL;
4205
4206         *num_mids = 0;
4207
4208         /* switch to large buffer if too big for a small one */
4209         if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE) {
4210                 server->large_buf = true;
4211                 memcpy(server->bigbuf, buf, server->total_read);
4212                 buf = server->bigbuf;
4213         }
4214
4215         /* now read the rest */
4216         length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
4217                                 pdu_length - HEADER_SIZE(server) + 1);
4218         if (length < 0)
4219                 return length;
4220         server->total_read += length;
4221
4222         buf_size = pdu_length - sizeof(struct smb2_transform_hdr);
4223         length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0);
4224         if (length)
4225                 return length;
4226
4227         next_is_large = server->large_buf;
4228 one_more:
4229         shdr = (struct smb2_sync_hdr *)buf;
4230         if (shdr->NextCommand) {
4231                 if (next_is_large)
4232                         next_buffer = (char *)cifs_buf_get();
4233                 else
4234                         next_buffer = (char *)cifs_small_buf_get();
4235                 memcpy(next_buffer,
4236                        buf + le32_to_cpu(shdr->NextCommand),
4237                        pdu_length - le32_to_cpu(shdr->NextCommand));
4238         }
4239
4240         mid_entry = smb2_find_mid(server, buf);
4241         if (mid_entry == NULL)
4242                 cifs_dbg(FYI, "mid not found\n");
4243         else {
4244                 cifs_dbg(FYI, "mid found\n");
4245                 mid_entry->decrypted = true;
4246                 mid_entry->resp_buf_size = server->pdu_size;
4247         }
4248
4249         if (*num_mids >= MAX_COMPOUND) {
4250                 cifs_server_dbg(VFS, "too many PDUs in compound\n");
4251                 return -1;
4252         }
4253         bufs[*num_mids] = buf;
4254         mids[(*num_mids)++] = mid_entry;
4255
4256         if (mid_entry && mid_entry->handle)
4257                 ret = mid_entry->handle(server, mid_entry);
4258         else
4259                 ret = cifs_handle_standard(server, mid_entry);
4260
4261         if (ret == 0 && shdr->NextCommand) {
4262                 pdu_length -= le32_to_cpu(shdr->NextCommand);
4263                 server->large_buf = next_is_large;
4264                 if (next_is_large)
4265                         server->bigbuf = buf = next_buffer;
4266                 else
4267                         server->smallbuf = buf = next_buffer;
4268                 goto one_more;
4269         } else if (ret != 0) {
4270                 /*
4271                  * ret != 0 here means that we didn't get to handle_mid() thus
4272                  * server->smallbuf and server->bigbuf are still valid. We need
4273                  * to free next_buffer because it is not going to be used
4274                  * anywhere.
4275                  */
4276                 if (next_is_large)
4277                         free_rsp_buf(CIFS_LARGE_BUFFER, next_buffer);
4278                 else
4279                         free_rsp_buf(CIFS_SMALL_BUFFER, next_buffer);
4280         }
4281
4282         return ret;
4283 }
4284
4285 static int
4286 smb3_receive_transform(struct TCP_Server_Info *server,
4287                        struct mid_q_entry **mids, char **bufs, int *num_mids)
4288 {
4289         char *buf = server->smallbuf;
4290         unsigned int pdu_length = server->pdu_size;
4291         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
4292         unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
4293
4294         if (pdu_length < sizeof(struct smb2_transform_hdr) +
4295                                                 sizeof(struct smb2_sync_hdr)) {
4296                 cifs_server_dbg(VFS, "Transform message is too small (%u)\n",
4297                          pdu_length);
4298                 cifs_reconnect(server);
4299                 wake_up(&server->response_q);
4300                 return -ECONNABORTED;
4301         }
4302
4303         if (pdu_length < orig_len + sizeof(struct smb2_transform_hdr)) {
4304                 cifs_server_dbg(VFS, "Transform message is broken\n");
4305                 cifs_reconnect(server);
4306                 wake_up(&server->response_q);
4307                 return -ECONNABORTED;
4308         }
4309
4310         /* TODO: add support for compounds containing READ. */
4311         if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server)) {
4312                 return receive_encrypted_read(server, &mids[0], num_mids);
4313         }
4314
4315         return receive_encrypted_standard(server, mids, bufs, num_mids);
4316 }
4317
4318 int
4319 smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
4320 {
4321         char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
4322
4323         return handle_read_data(server, mid, buf, server->pdu_size,
4324                                 NULL, 0, 0);
4325 }
4326
4327 static int
4328 smb2_next_header(char *buf)
4329 {
4330         struct smb2_sync_hdr *hdr = (struct smb2_sync_hdr *)buf;
4331         struct smb2_transform_hdr *t_hdr = (struct smb2_transform_hdr *)buf;
4332
4333         if (hdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM)
4334                 return sizeof(struct smb2_transform_hdr) +
4335                   le32_to_cpu(t_hdr->OriginalMessageSize);
4336
4337         return le32_to_cpu(hdr->NextCommand);
4338 }
4339
4340 static int
4341 smb2_make_node(unsigned int xid, struct inode *inode,
4342                struct dentry *dentry, struct cifs_tcon *tcon,
4343                char *full_path, umode_t mode, dev_t dev)
4344 {
4345         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
4346         int rc = -EPERM;
4347         int create_options = CREATE_NOT_DIR | CREATE_OPTION_SPECIAL;
4348         FILE_ALL_INFO *buf = NULL;
4349         struct cifs_io_parms io_parms;
4350         __u32 oplock = 0;
4351         struct cifs_fid fid;
4352         struct cifs_open_parms oparms;
4353         unsigned int bytes_written;
4354         struct win_dev *pdev;
4355         struct kvec iov[2];
4356
4357         /*
4358          * Check if mounted with mount parm 'sfu' mount parm.
4359          * SFU emulation should work with all servers, but only
4360          * supports block and char device (no socket & fifo),
4361          * and was used by default in earlier versions of Windows
4362          */
4363         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
4364                 goto out;
4365
4366         /*
4367          * TODO: Add ability to create instead via reparse point. Windows (e.g.
4368          * their current NFS server) uses this approach to expose special files
4369          * over SMB2/SMB3 and Samba will do this with SMB3.1.1 POSIX Extensions
4370          */
4371
4372         if (!S_ISCHR(mode) && !S_ISBLK(mode))
4373                 goto out;
4374
4375         cifs_dbg(FYI, "sfu compat create special file\n");
4376
4377         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
4378         if (buf == NULL) {
4379                 rc = -ENOMEM;
4380                 goto out;
4381         }
4382
4383         if (backup_cred(cifs_sb))
4384                 create_options |= CREATE_OPEN_BACKUP_INTENT;
4385
4386         oparms.tcon = tcon;
4387         oparms.cifs_sb = cifs_sb;
4388         oparms.desired_access = GENERIC_WRITE;
4389         oparms.create_options = create_options;
4390         oparms.disposition = FILE_CREATE;
4391         oparms.path = full_path;
4392         oparms.fid = &fid;
4393         oparms.reconnect = false;
4394
4395         if (tcon->ses->server->oplocks)
4396                 oplock = REQ_OPLOCK;
4397         else
4398                 oplock = 0;
4399         rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
4400         if (rc)
4401                 goto out;
4402
4403         /*
4404          * BB Do not bother to decode buf since no local inode yet to put
4405          * timestamps in, but we can reuse it safely.
4406          */
4407
4408         pdev = (struct win_dev *)buf;
4409         io_parms.pid = current->tgid;
4410         io_parms.tcon = tcon;
4411         io_parms.offset = 0;
4412         io_parms.length = sizeof(struct win_dev);
4413         iov[1].iov_base = buf;
4414         iov[1].iov_len = sizeof(struct win_dev);
4415         if (S_ISCHR(mode)) {
4416                 memcpy(pdev->type, "IntxCHR", 8);
4417                 pdev->major = cpu_to_le64(MAJOR(dev));
4418                 pdev->minor = cpu_to_le64(MINOR(dev));
4419                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
4420                                                         &bytes_written, iov, 1);
4421         } else if (S_ISBLK(mode)) {
4422                 memcpy(pdev->type, "IntxBLK", 8);
4423                 pdev->major = cpu_to_le64(MAJOR(dev));
4424                 pdev->minor = cpu_to_le64(MINOR(dev));
4425                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
4426                                                         &bytes_written, iov, 1);
4427         }
4428         tcon->ses->server->ops->close(xid, tcon, &fid);
4429         d_drop(dentry);
4430
4431         /* FIXME: add code here to set EAs */
4432 out:
4433         kfree(buf);
4434         return rc;
4435 }
4436
4437
4438 struct smb_version_operations smb20_operations = {
4439         .compare_fids = smb2_compare_fids,
4440         .setup_request = smb2_setup_request,
4441         .setup_async_request = smb2_setup_async_request,
4442         .check_receive = smb2_check_receive,
4443         .add_credits = smb2_add_credits,
4444         .set_credits = smb2_set_credits,
4445         .get_credits_field = smb2_get_credits_field,
4446         .get_credits = smb2_get_credits,
4447         .wait_mtu_credits = cifs_wait_mtu_credits,
4448         .get_next_mid = smb2_get_next_mid,
4449         .revert_current_mid = smb2_revert_current_mid,
4450         .read_data_offset = smb2_read_data_offset,
4451         .read_data_length = smb2_read_data_length,
4452         .map_error = map_smb2_to_linux_error,
4453         .find_mid = smb2_find_mid,
4454         .check_message = smb2_check_message,
4455         .dump_detail = smb2_dump_detail,
4456         .clear_stats = smb2_clear_stats,
4457         .print_stats = smb2_print_stats,
4458         .is_oplock_break = smb2_is_valid_oplock_break,
4459         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4460         .downgrade_oplock = smb2_downgrade_oplock,
4461         .need_neg = smb2_need_neg,
4462         .negotiate = smb2_negotiate,
4463         .negotiate_wsize = smb2_negotiate_wsize,
4464         .negotiate_rsize = smb2_negotiate_rsize,
4465         .sess_setup = SMB2_sess_setup,
4466         .logoff = SMB2_logoff,
4467         .tree_connect = SMB2_tcon,
4468         .tree_disconnect = SMB2_tdis,
4469         .qfs_tcon = smb2_qfs_tcon,
4470         .is_path_accessible = smb2_is_path_accessible,
4471         .can_echo = smb2_can_echo,
4472         .echo = SMB2_echo,
4473         .query_path_info = smb2_query_path_info,
4474         .get_srv_inum = smb2_get_srv_inum,
4475         .query_file_info = smb2_query_file_info,
4476         .set_path_size = smb2_set_path_size,
4477         .set_file_size = smb2_set_file_size,
4478         .set_file_info = smb2_set_file_info,
4479         .set_compression = smb2_set_compression,
4480         .mkdir = smb2_mkdir,
4481         .mkdir_setinfo = smb2_mkdir_setinfo,
4482         .rmdir = smb2_rmdir,
4483         .unlink = smb2_unlink,
4484         .rename = smb2_rename_path,
4485         .create_hardlink = smb2_create_hardlink,
4486         .query_symlink = smb2_query_symlink,
4487         .query_mf_symlink = smb3_query_mf_symlink,
4488         .create_mf_symlink = smb3_create_mf_symlink,
4489         .open = smb2_open_file,
4490         .set_fid = smb2_set_fid,
4491         .close = smb2_close_file,
4492         .flush = smb2_flush_file,
4493         .async_readv = smb2_async_readv,
4494         .async_writev = smb2_async_writev,
4495         .sync_read = smb2_sync_read,
4496         .sync_write = smb2_sync_write,
4497         .query_dir_first = smb2_query_dir_first,
4498         .query_dir_next = smb2_query_dir_next,
4499         .close_dir = smb2_close_dir,
4500         .calc_smb_size = smb2_calc_size,
4501         .is_status_pending = smb2_is_status_pending,
4502         .is_session_expired = smb2_is_session_expired,
4503         .oplock_response = smb2_oplock_response,
4504         .queryfs = smb2_queryfs,
4505         .mand_lock = smb2_mand_lock,
4506         .mand_unlock_range = smb2_unlock_range,
4507         .push_mand_locks = smb2_push_mandatory_locks,
4508         .get_lease_key = smb2_get_lease_key,
4509         .set_lease_key = smb2_set_lease_key,
4510         .new_lease_key = smb2_new_lease_key,
4511         .calc_signature = smb2_calc_signature,
4512         .is_read_op = smb2_is_read_op,
4513         .set_oplock_level = smb2_set_oplock_level,
4514         .create_lease_buf = smb2_create_lease_buf,
4515         .parse_lease_buf = smb2_parse_lease_buf,
4516         .copychunk_range = smb2_copychunk_range,
4517         .wp_retry_size = smb2_wp_retry_size,
4518         .dir_needs_close = smb2_dir_needs_close,
4519         .get_dfs_refer = smb2_get_dfs_refer,
4520         .select_sectype = smb2_select_sectype,
4521 #ifdef CONFIG_CIFS_XATTR
4522         .query_all_EAs = smb2_query_eas,
4523         .set_EA = smb2_set_ea,
4524 #endif /* CIFS_XATTR */
4525         .get_acl = get_smb2_acl,
4526         .get_acl_by_fid = get_smb2_acl_by_fid,
4527         .set_acl = set_smb2_acl,
4528         .next_header = smb2_next_header,
4529         .ioctl_query_info = smb2_ioctl_query_info,
4530         .make_node = smb2_make_node,
4531         .fiemap = smb3_fiemap,
4532         .llseek = smb3_llseek,
4533 };
4534
4535 struct smb_version_operations smb21_operations = {
4536         .compare_fids = smb2_compare_fids,
4537         .setup_request = smb2_setup_request,
4538         .setup_async_request = smb2_setup_async_request,
4539         .check_receive = smb2_check_receive,
4540         .add_credits = smb2_add_credits,
4541         .set_credits = smb2_set_credits,
4542         .get_credits_field = smb2_get_credits_field,
4543         .get_credits = smb2_get_credits,
4544         .wait_mtu_credits = smb2_wait_mtu_credits,
4545         .adjust_credits = smb2_adjust_credits,
4546         .get_next_mid = smb2_get_next_mid,
4547         .revert_current_mid = smb2_revert_current_mid,
4548         .read_data_offset = smb2_read_data_offset,
4549         .read_data_length = smb2_read_data_length,
4550         .map_error = map_smb2_to_linux_error,
4551         .find_mid = smb2_find_mid,
4552         .check_message = smb2_check_message,
4553         .dump_detail = smb2_dump_detail,
4554         .clear_stats = smb2_clear_stats,
4555         .print_stats = smb2_print_stats,
4556         .is_oplock_break = smb2_is_valid_oplock_break,
4557         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4558         .downgrade_oplock = smb21_downgrade_oplock,
4559         .need_neg = smb2_need_neg,
4560         .negotiate = smb2_negotiate,
4561         .negotiate_wsize = smb2_negotiate_wsize,
4562         .negotiate_rsize = smb2_negotiate_rsize,
4563         .sess_setup = SMB2_sess_setup,
4564         .logoff = SMB2_logoff,
4565         .tree_connect = SMB2_tcon,
4566         .tree_disconnect = SMB2_tdis,
4567         .qfs_tcon = smb2_qfs_tcon,
4568         .is_path_accessible = smb2_is_path_accessible,
4569         .can_echo = smb2_can_echo,
4570         .echo = SMB2_echo,
4571         .query_path_info = smb2_query_path_info,
4572         .get_srv_inum = smb2_get_srv_inum,
4573         .query_file_info = smb2_query_file_info,
4574         .set_path_size = smb2_set_path_size,
4575         .set_file_size = smb2_set_file_size,
4576         .set_file_info = smb2_set_file_info,
4577         .set_compression = smb2_set_compression,
4578         .mkdir = smb2_mkdir,
4579         .mkdir_setinfo = smb2_mkdir_setinfo,
4580         .rmdir = smb2_rmdir,
4581         .unlink = smb2_unlink,
4582         .rename = smb2_rename_path,
4583         .create_hardlink = smb2_create_hardlink,
4584         .query_symlink = smb2_query_symlink,
4585         .query_mf_symlink = smb3_query_mf_symlink,
4586         .create_mf_symlink = smb3_create_mf_symlink,
4587         .open = smb2_open_file,
4588         .set_fid = smb2_set_fid,
4589         .close = smb2_close_file,
4590         .flush = smb2_flush_file,
4591         .async_readv = smb2_async_readv,
4592         .async_writev = smb2_async_writev,
4593         .sync_read = smb2_sync_read,
4594         .sync_write = smb2_sync_write,
4595         .query_dir_first = smb2_query_dir_first,
4596         .query_dir_next = smb2_query_dir_next,
4597         .close_dir = smb2_close_dir,
4598         .calc_smb_size = smb2_calc_size,
4599         .is_status_pending = smb2_is_status_pending,
4600         .is_session_expired = smb2_is_session_expired,
4601         .oplock_response = smb2_oplock_response,
4602         .queryfs = smb2_queryfs,
4603         .mand_lock = smb2_mand_lock,
4604         .mand_unlock_range = smb2_unlock_range,
4605         .push_mand_locks = smb2_push_mandatory_locks,
4606         .get_lease_key = smb2_get_lease_key,
4607         .set_lease_key = smb2_set_lease_key,
4608         .new_lease_key = smb2_new_lease_key,
4609         .calc_signature = smb2_calc_signature,
4610         .is_read_op = smb21_is_read_op,
4611         .set_oplock_level = smb21_set_oplock_level,
4612         .create_lease_buf = smb2_create_lease_buf,
4613         .parse_lease_buf = smb2_parse_lease_buf,
4614         .copychunk_range = smb2_copychunk_range,
4615         .wp_retry_size = smb2_wp_retry_size,
4616         .dir_needs_close = smb2_dir_needs_close,
4617         .enum_snapshots = smb3_enum_snapshots,
4618         .get_dfs_refer = smb2_get_dfs_refer,
4619         .select_sectype = smb2_select_sectype,
4620 #ifdef CONFIG_CIFS_XATTR
4621         .query_all_EAs = smb2_query_eas,
4622         .set_EA = smb2_set_ea,
4623 #endif /* CIFS_XATTR */
4624         .get_acl = get_smb2_acl,
4625         .get_acl_by_fid = get_smb2_acl_by_fid,
4626         .set_acl = set_smb2_acl,
4627         .next_header = smb2_next_header,
4628         .ioctl_query_info = smb2_ioctl_query_info,
4629         .make_node = smb2_make_node,
4630         .fiemap = smb3_fiemap,
4631         .llseek = smb3_llseek,
4632 };
4633
4634 struct smb_version_operations smb30_operations = {
4635         .compare_fids = smb2_compare_fids,
4636         .setup_request = smb2_setup_request,
4637         .setup_async_request = smb2_setup_async_request,
4638         .check_receive = smb2_check_receive,
4639         .add_credits = smb2_add_credits,
4640         .set_credits = smb2_set_credits,
4641         .get_credits_field = smb2_get_credits_field,
4642         .get_credits = smb2_get_credits,
4643         .wait_mtu_credits = smb2_wait_mtu_credits,
4644         .adjust_credits = smb2_adjust_credits,
4645         .get_next_mid = smb2_get_next_mid,
4646         .revert_current_mid = smb2_revert_current_mid,
4647         .read_data_offset = smb2_read_data_offset,
4648         .read_data_length = smb2_read_data_length,
4649         .map_error = map_smb2_to_linux_error,
4650         .find_mid = smb2_find_mid,
4651         .check_message = smb2_check_message,
4652         .dump_detail = smb2_dump_detail,
4653         .clear_stats = smb2_clear_stats,
4654         .print_stats = smb2_print_stats,
4655         .dump_share_caps = smb2_dump_share_caps,
4656         .is_oplock_break = smb2_is_valid_oplock_break,
4657         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4658         .downgrade_oplock = smb21_downgrade_oplock,
4659         .need_neg = smb2_need_neg,
4660         .negotiate = smb2_negotiate,
4661         .negotiate_wsize = smb3_negotiate_wsize,
4662         .negotiate_rsize = smb3_negotiate_rsize,
4663         .sess_setup = SMB2_sess_setup,
4664         .logoff = SMB2_logoff,
4665         .tree_connect = SMB2_tcon,
4666         .tree_disconnect = SMB2_tdis,
4667         .qfs_tcon = smb3_qfs_tcon,
4668         .is_path_accessible = smb2_is_path_accessible,
4669         .can_echo = smb2_can_echo,
4670         .echo = SMB2_echo,
4671         .query_path_info = smb2_query_path_info,
4672         .get_srv_inum = smb2_get_srv_inum,
4673         .query_file_info = smb2_query_file_info,
4674         .set_path_size = smb2_set_path_size,
4675         .set_file_size = smb2_set_file_size,
4676         .set_file_info = smb2_set_file_info,
4677         .set_compression = smb2_set_compression,
4678         .mkdir = smb2_mkdir,
4679         .mkdir_setinfo = smb2_mkdir_setinfo,
4680         .rmdir = smb2_rmdir,
4681         .unlink = smb2_unlink,
4682         .rename = smb2_rename_path,
4683         .create_hardlink = smb2_create_hardlink,
4684         .query_symlink = smb2_query_symlink,
4685         .query_mf_symlink = smb3_query_mf_symlink,
4686         .create_mf_symlink = smb3_create_mf_symlink,
4687         .open = smb2_open_file,
4688         .set_fid = smb2_set_fid,
4689         .close = smb2_close_file,
4690         .flush = smb2_flush_file,
4691         .async_readv = smb2_async_readv,
4692         .async_writev = smb2_async_writev,
4693         .sync_read = smb2_sync_read,
4694         .sync_write = smb2_sync_write,
4695         .query_dir_first = smb2_query_dir_first,
4696         .query_dir_next = smb2_query_dir_next,
4697         .close_dir = smb2_close_dir,
4698         .calc_smb_size = smb2_calc_size,
4699         .is_status_pending = smb2_is_status_pending,
4700         .is_session_expired = smb2_is_session_expired,
4701         .oplock_response = smb2_oplock_response,
4702         .queryfs = smb2_queryfs,
4703         .mand_lock = smb2_mand_lock,
4704         .mand_unlock_range = smb2_unlock_range,
4705         .push_mand_locks = smb2_push_mandatory_locks,
4706         .get_lease_key = smb2_get_lease_key,
4707         .set_lease_key = smb2_set_lease_key,
4708         .new_lease_key = smb2_new_lease_key,
4709         .generate_signingkey = generate_smb30signingkey,
4710         .calc_signature = smb3_calc_signature,
4711         .set_integrity  = smb3_set_integrity,
4712         .is_read_op = smb21_is_read_op,
4713         .set_oplock_level = smb3_set_oplock_level,
4714         .create_lease_buf = smb3_create_lease_buf,
4715         .parse_lease_buf = smb3_parse_lease_buf,
4716         .copychunk_range = smb2_copychunk_range,
4717         .duplicate_extents = smb2_duplicate_extents,
4718         .validate_negotiate = smb3_validate_negotiate,
4719         .wp_retry_size = smb2_wp_retry_size,
4720         .dir_needs_close = smb2_dir_needs_close,
4721         .fallocate = smb3_fallocate,
4722         .enum_snapshots = smb3_enum_snapshots,
4723         .init_transform_rq = smb3_init_transform_rq,
4724         .is_transform_hdr = smb3_is_transform_hdr,
4725         .receive_transform = smb3_receive_transform,
4726         .get_dfs_refer = smb2_get_dfs_refer,
4727         .select_sectype = smb2_select_sectype,
4728 #ifdef CONFIG_CIFS_XATTR
4729         .query_all_EAs = smb2_query_eas,
4730         .set_EA = smb2_set_ea,
4731 #endif /* CIFS_XATTR */
4732         .get_acl = get_smb2_acl,
4733         .get_acl_by_fid = get_smb2_acl_by_fid,
4734         .set_acl = set_smb2_acl,
4735         .next_header = smb2_next_header,
4736         .ioctl_query_info = smb2_ioctl_query_info,
4737         .make_node = smb2_make_node,
4738         .fiemap = smb3_fiemap,
4739         .llseek = smb3_llseek,
4740 };
4741
4742 struct smb_version_operations smb311_operations = {
4743         .compare_fids = smb2_compare_fids,
4744         .setup_request = smb2_setup_request,
4745         .setup_async_request = smb2_setup_async_request,
4746         .check_receive = smb2_check_receive,
4747         .add_credits = smb2_add_credits,
4748         .set_credits = smb2_set_credits,
4749         .get_credits_field = smb2_get_credits_field,
4750         .get_credits = smb2_get_credits,
4751         .wait_mtu_credits = smb2_wait_mtu_credits,
4752         .adjust_credits = smb2_adjust_credits,
4753         .get_next_mid = smb2_get_next_mid,
4754         .revert_current_mid = smb2_revert_current_mid,
4755         .read_data_offset = smb2_read_data_offset,
4756         .read_data_length = smb2_read_data_length,
4757         .map_error = map_smb2_to_linux_error,
4758         .find_mid = smb2_find_mid,
4759         .check_message = smb2_check_message,
4760         .dump_detail = smb2_dump_detail,
4761         .clear_stats = smb2_clear_stats,
4762         .print_stats = smb2_print_stats,
4763         .dump_share_caps = smb2_dump_share_caps,
4764         .is_oplock_break = smb2_is_valid_oplock_break,
4765         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4766         .downgrade_oplock = smb21_downgrade_oplock,
4767         .need_neg = smb2_need_neg,
4768         .negotiate = smb2_negotiate,
4769         .negotiate_wsize = smb3_negotiate_wsize,
4770         .negotiate_rsize = smb3_negotiate_rsize,
4771         .sess_setup = SMB2_sess_setup,
4772         .logoff = SMB2_logoff,
4773         .tree_connect = SMB2_tcon,
4774         .tree_disconnect = SMB2_tdis,
4775         .qfs_tcon = smb3_qfs_tcon,
4776         .is_path_accessible = smb2_is_path_accessible,
4777         .can_echo = smb2_can_echo,
4778         .echo = SMB2_echo,
4779         .query_path_info = smb2_query_path_info,
4780         .get_srv_inum = smb2_get_srv_inum,
4781         .query_file_info = smb2_query_file_info,
4782         .set_path_size = smb2_set_path_size,
4783         .set_file_size = smb2_set_file_size,
4784         .set_file_info = smb2_set_file_info,
4785         .set_compression = smb2_set_compression,
4786         .mkdir = smb2_mkdir,
4787         .mkdir_setinfo = smb2_mkdir_setinfo,
4788         .posix_mkdir = smb311_posix_mkdir,
4789         .rmdir = smb2_rmdir,
4790         .unlink = smb2_unlink,
4791         .rename = smb2_rename_path,
4792         .create_hardlink = smb2_create_hardlink,
4793         .query_symlink = smb2_query_symlink,
4794         .query_mf_symlink = smb3_query_mf_symlink,
4795         .create_mf_symlink = smb3_create_mf_symlink,
4796         .open = smb2_open_file,
4797         .set_fid = smb2_set_fid,
4798         .close = smb2_close_file,
4799         .flush = smb2_flush_file,
4800         .async_readv = smb2_async_readv,
4801         .async_writev = smb2_async_writev,
4802         .sync_read = smb2_sync_read,
4803         .sync_write = smb2_sync_write,
4804         .query_dir_first = smb2_query_dir_first,
4805         .query_dir_next = smb2_query_dir_next,
4806         .close_dir = smb2_close_dir,
4807         .calc_smb_size = smb2_calc_size,
4808         .is_status_pending = smb2_is_status_pending,
4809         .is_session_expired = smb2_is_session_expired,
4810         .oplock_response = smb2_oplock_response,
4811         .queryfs = smb311_queryfs,
4812         .mand_lock = smb2_mand_lock,
4813         .mand_unlock_range = smb2_unlock_range,
4814         .push_mand_locks = smb2_push_mandatory_locks,
4815         .get_lease_key = smb2_get_lease_key,
4816         .set_lease_key = smb2_set_lease_key,
4817         .new_lease_key = smb2_new_lease_key,
4818         .generate_signingkey = generate_smb311signingkey,
4819         .calc_signature = smb3_calc_signature,
4820         .set_integrity  = smb3_set_integrity,
4821         .is_read_op = smb21_is_read_op,
4822         .set_oplock_level = smb3_set_oplock_level,
4823         .create_lease_buf = smb3_create_lease_buf,
4824         .parse_lease_buf = smb3_parse_lease_buf,
4825         .copychunk_range = smb2_copychunk_range,
4826         .duplicate_extents = smb2_duplicate_extents,
4827 /*      .validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
4828         .wp_retry_size = smb2_wp_retry_size,
4829         .dir_needs_close = smb2_dir_needs_close,
4830         .fallocate = smb3_fallocate,
4831         .enum_snapshots = smb3_enum_snapshots,
4832         .init_transform_rq = smb3_init_transform_rq,
4833         .is_transform_hdr = smb3_is_transform_hdr,
4834         .receive_transform = smb3_receive_transform,
4835         .get_dfs_refer = smb2_get_dfs_refer,
4836         .select_sectype = smb2_select_sectype,
4837 #ifdef CONFIG_CIFS_XATTR
4838         .query_all_EAs = smb2_query_eas,
4839         .set_EA = smb2_set_ea,
4840 #endif /* CIFS_XATTR */
4841         .get_acl = get_smb2_acl,
4842         .get_acl_by_fid = get_smb2_acl_by_fid,
4843         .set_acl = set_smb2_acl,
4844         .next_header = smb2_next_header,
4845         .ioctl_query_info = smb2_ioctl_query_info,
4846         .make_node = smb2_make_node,
4847         .fiemap = smb3_fiemap,
4848         .llseek = smb3_llseek,
4849 };
4850
4851 struct smb_version_values smb20_values = {
4852         .version_string = SMB20_VERSION_STRING,
4853         .protocol_id = SMB20_PROT_ID,
4854         .req_capabilities = 0, /* MBZ */
4855         .large_lock_type = 0,
4856         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4857         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4858         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4859         .header_size = sizeof(struct smb2_sync_hdr),
4860         .header_preamble_size = 0,
4861         .max_header_size = MAX_SMB2_HDR_SIZE,
4862         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4863         .lock_cmd = SMB2_LOCK,
4864         .cap_unix = 0,
4865         .cap_nt_find = SMB2_NT_FIND,
4866         .cap_large_files = SMB2_LARGE_FILES,
4867         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4868         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4869         .create_lease_size = sizeof(struct create_lease),
4870 };
4871
4872 struct smb_version_values smb21_values = {
4873         .version_string = SMB21_VERSION_STRING,
4874         .protocol_id = SMB21_PROT_ID,
4875         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
4876         .large_lock_type = 0,
4877         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4878         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4879         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4880         .header_size = sizeof(struct smb2_sync_hdr),
4881         .header_preamble_size = 0,
4882         .max_header_size = MAX_SMB2_HDR_SIZE,
4883         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4884         .lock_cmd = SMB2_LOCK,
4885         .cap_unix = 0,
4886         .cap_nt_find = SMB2_NT_FIND,
4887         .cap_large_files = SMB2_LARGE_FILES,
4888         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4889         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4890         .create_lease_size = sizeof(struct create_lease),
4891 };
4892
4893 struct smb_version_values smb3any_values = {
4894         .version_string = SMB3ANY_VERSION_STRING,
4895         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
4896         .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,
4897         .large_lock_type = 0,
4898         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4899         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4900         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4901         .header_size = sizeof(struct smb2_sync_hdr),
4902         .header_preamble_size = 0,
4903         .max_header_size = MAX_SMB2_HDR_SIZE,
4904         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4905         .lock_cmd = SMB2_LOCK,
4906         .cap_unix = 0,
4907         .cap_nt_find = SMB2_NT_FIND,
4908         .cap_large_files = SMB2_LARGE_FILES,
4909         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4910         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4911         .create_lease_size = sizeof(struct create_lease_v2),
4912 };
4913
4914 struct smb_version_values smbdefault_values = {
4915         .version_string = SMBDEFAULT_VERSION_STRING,
4916         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
4917         .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,
4918         .large_lock_type = 0,
4919         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4920         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4921         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4922         .header_size = sizeof(struct smb2_sync_hdr),
4923         .header_preamble_size = 0,
4924         .max_header_size = MAX_SMB2_HDR_SIZE,
4925         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4926         .lock_cmd = SMB2_LOCK,
4927         .cap_unix = 0,
4928         .cap_nt_find = SMB2_NT_FIND,
4929         .cap_large_files = SMB2_LARGE_FILES,
4930         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4931         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4932         .create_lease_size = sizeof(struct create_lease_v2),
4933 };
4934
4935 struct smb_version_values smb30_values = {
4936         .version_string = SMB30_VERSION_STRING,
4937         .protocol_id = SMB30_PROT_ID,
4938         .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,
4939         .large_lock_type = 0,
4940         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4941         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4942         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4943         .header_size = sizeof(struct smb2_sync_hdr),
4944         .header_preamble_size = 0,
4945         .max_header_size = MAX_SMB2_HDR_SIZE,
4946         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4947         .lock_cmd = SMB2_LOCK,
4948         .cap_unix = 0,
4949         .cap_nt_find = SMB2_NT_FIND,
4950         .cap_large_files = SMB2_LARGE_FILES,
4951         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4952         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4953         .create_lease_size = sizeof(struct create_lease_v2),
4954 };
4955
4956 struct smb_version_values smb302_values = {
4957         .version_string = SMB302_VERSION_STRING,
4958         .protocol_id = SMB302_PROT_ID,
4959         .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,
4960         .large_lock_type = 0,
4961         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4962         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4963         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4964         .header_size = sizeof(struct smb2_sync_hdr),
4965         .header_preamble_size = 0,
4966         .max_header_size = MAX_SMB2_HDR_SIZE,
4967         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4968         .lock_cmd = SMB2_LOCK,
4969         .cap_unix = 0,
4970         .cap_nt_find = SMB2_NT_FIND,
4971         .cap_large_files = SMB2_LARGE_FILES,
4972         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4973         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4974         .create_lease_size = sizeof(struct create_lease_v2),
4975 };
4976
4977 struct smb_version_values smb311_values = {
4978         .version_string = SMB311_VERSION_STRING,
4979         .protocol_id = SMB311_PROT_ID,
4980         .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,
4981         .large_lock_type = 0,
4982         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
4983         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
4984         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
4985         .header_size = sizeof(struct smb2_sync_hdr),
4986         .header_preamble_size = 0,
4987         .max_header_size = MAX_SMB2_HDR_SIZE,
4988         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
4989         .lock_cmd = SMB2_LOCK,
4990         .cap_unix = 0,
4991         .cap_nt_find = SMB2_NT_FIND,
4992         .cap_large_files = SMB2_LARGE_FILES,
4993         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
4994         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
4995         .create_lease_size = sizeof(struct create_lease_v2),
4996 };