fs/cifs/smb2ops.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  SMB2 version specific operations
   4  *
   5  *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
   6  */
   7
   8 #include <linux/pagemap.h>
   9 #include <linux/vfs.h>
  10 #include <linux/falloc.h>
  11 #include <linux/scatterlist.h>
  12 #include <linux/uuid.h>
  13 #include <linux/sort.h>
  14 #include <crypto/aead.h>
  15 #include <linux/fiemap.h>
  16 #include "cifsfs.h"
  17 #include "cifsglob.h"
  18 #include "smb2pdu.h"
  19 #include "smb2proto.h"
  20 #include "cifsproto.h"
  21 #include "cifs_debug.h"
  22 #include "cifs_unicode.h"
  23 #include "smb2status.h"
  24 #include "smb2glob.h"
  25 #include "cifs_ioctl.h"
  26 #include "smbdirect.h"
  27
  28 /* Change credits for different ops and return the total number of credits */
  29 static int
  30 change_conf(struct TCP_Server_Info *server)
  31 {
  32         server->credits += server->echo_credits + server->oplock_credits;
  33         server->oplock_credits = server->echo_credits = 0;
  34         switch (server->credits) {
  35         case 0:
  36                 return 0;
  37         case 1:
  38                 server->echoes = false;
  39                 server->oplocks = false;
  40                 break;
  41         case 2:
  42                 server->echoes = true;
  43                 server->oplocks = false;
  44                 server->echo_credits = 1;
  45                 break;
  46         default:
  47                 server->echoes = true;
  48                 if (enable_oplocks) {
  49                         server->oplocks = true;
  50                         server->oplock_credits = 1;
  51                 } else
  52                         server->oplocks = false;
  53
  54                 server->echo_credits = 1;
  55         }
  56         server->credits -= server->echo_credits + server->oplock_credits;
  57         return server->credits + server->echo_credits + server->oplock_credits;
  58 }
  59
  60 static void
  61 smb2_add_credits(struct TCP_Server_Info *server,
  62                  const struct cifs_credits *credits, const int optype)
  63 {
  64         int *val, rc = -1;
  65         unsigned int add = credits->value;
  66         unsigned int instance = credits->instance;
  67         bool reconnect_detected = false;
  68
  69         spin_lock(&server->req_lock);
  70         val = server->ops->get_credits_field(server, optype);
  71
  72         /* eg found case where write overlapping reconnect messed up credits */
  73         if (((optype & CIFS_OP_MASK) == CIFS_NEG_OP) && (*val != 0))
  74                 trace_smb3_reconnect_with_invalid_credits(server->CurrentMid,
  75                         server->hostname, *val, add);
  76         if ((instance == 0) || (instance == server->reconnect_instance))
  77                 *val += add;
  78         else
  79                 reconnect_detected = true;
  80
  81         if (*val > 65000) {
  82                 *val = 65000; /* Don't get near 64K credits, avoid srv bugs */
  83                 pr_warn_once("server overflowed SMB3 credits\n");
  84         }
  85         server->in_flight--;
  86         if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
  87                 rc = change_conf(server);
  88         /*
  89          * Sometimes server returns 0 credits on oplock break ack - we need to
  90          * rebalance credits in this case.
  91          */
  92         else if (server->in_flight > 0 && server->oplock_credits == 0 &&
  93                  server->oplocks) {
  94                 if (server->credits > 1) {
  95                         server->credits--;
  96                         server->oplock_credits++;
  97                 }
  98         }
  99         spin_unlock(&server->req_lock);
 100         wake_up(&server->request_q);
 101
 102         if (reconnect_detected)
 103                 cifs_dbg(FYI, "trying to put %d credits from the old server instance %d\n",
 104                          add, instance);
 105
 106         if (server->tcpStatus == CifsNeedReconnect
 107             || server->tcpStatus == CifsExiting)
 108                 return;
 109
 110         switch (rc) {
 111         case -1:
 112                 /* change_conf hasn't been executed */
 113                 break;
 114         case 0:
 115                 cifs_server_dbg(VFS, "Possible client or server bug - zero credits\n");
 116                 break;
 117         case 1:
 118                 cifs_server_dbg(VFS, "disabling echoes and oplocks\n");
 119                 break;
 120         case 2:
 121                 cifs_dbg(FYI, "disabling oplocks\n");
 122                 break;
 123         default:
 124                 trace_smb3_add_credits(server->CurrentMid,
 125                         server->hostname, rc, add);
 126                 cifs_dbg(FYI, "add %u credits total=%d\n", add, rc);
 127         }
 128 }
 129
 130 static void
 131 smb2_set_credits(struct TCP_Server_Info *server, const int val)
 132 {
 133         spin_lock(&server->req_lock);
 134         server->credits = val;
 135         if (val == 1)
 136                 server->reconnect_instance++;
 137         spin_unlock(&server->req_lock);
 138         /* don't log while holding the lock */
 139         if (val == 1)
 140                 cifs_dbg(FYI, "set credits to 1 due to smb2 reconnect\n");
 141 }
 142
 143 static int *
 144 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
 145 {
 146         switch (optype) {
 147         case CIFS_ECHO_OP:
 148                 return &server->echo_credits;
 149         case CIFS_OBREAK_OP:
 150                 return &server->oplock_credits;
 151         default:
 152                 return &server->credits;
 153         }
 154 }
 155
 156 static unsigned int
 157 smb2_get_credits(struct mid_q_entry *mid)
 158 {
 159         return mid->credits_received;
 160 }
 161
 162 static int
 163 smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
 164                       unsigned int *num, struct cifs_credits *credits)
 165 {
 166         int rc = 0;
 167         unsigned int scredits;
 168
 169         spin_lock(&server->req_lock);
 170         while (1) {
 171                 if (server->credits <= 0) {
 172                         spin_unlock(&server->req_lock);
 173                         cifs_num_waiters_inc(server);
 174                         rc = wait_event_killable(server->request_q,
 175                                 has_credits(server, &server->credits, 1));
 176                         cifs_num_waiters_dec(server);
 177                         if (rc)
 178                                 return rc;
 179                         spin_lock(&server->req_lock);
 180                 } else {
 181                         if (server->tcpStatus == CifsExiting) {
 182                                 spin_unlock(&server->req_lock);
 183                                 return -ENOENT;
 184                         }
 185
 186                         scredits = server->credits;
 187                         /* can deadlock with reopen */
 188                         if (scredits <= 8) {
 189                                 *num = SMB2_MAX_BUFFER_SIZE;
 190                                 credits->value = 0;
 191                                 credits->instance = 0;
 192                                 break;
 193                         }
 194
 195                         /* leave some credits for reopen and other ops */
 196                         scredits -= 8;
 197                         *num = min_t(unsigned int, size,
 198                                      scredits * SMB2_MAX_BUFFER_SIZE);
 199
 200                         credits->value =
 201                                 DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
 202                         credits->instance = server->reconnect_instance;
 203                         server->credits -= credits->value;
 204                         server->in_flight++;
 205                         if (server->in_flight > server->max_in_flight)
 206                                 server->max_in_flight = server->in_flight;
 207                         break;
 208                 }
 209         }
 210         spin_unlock(&server->req_lock);
 211         return rc;
 212 }
 213
 214 static int
 215 smb2_adjust_credits(struct TCP_Server_Info *server,
 216                     struct cifs_credits *credits,
 217                     const unsigned int payload_size)
 218 {
 219         int new_val = DIV_ROUND_UP(payload_size, SMB2_MAX_BUFFER_SIZE);
 220
 221         if (!credits->value || credits->value == new_val)
 222                 return 0;
 223
 224         if (credits->value < new_val) {
 225                 WARN_ONCE(1, "request has less credits (%d) than required (%d)",
 226                           credits->value, new_val);
 227                 return -ENOTSUPP;
 228         }
 229
 230         spin_lock(&server->req_lock);
 231
 232         if (server->reconnect_instance != credits->instance) {
 233                 spin_unlock(&server->req_lock);
 234                 cifs_server_dbg(VFS, "trying to return %d credits to old session\n",
 235                          credits->value - new_val);
 236                 return -EAGAIN;
 237         }
 238
 239         server->credits += credits->value - new_val;
 240         spin_unlock(&server->req_lock);
 241         wake_up(&server->request_q);
 242         credits->value = new_val;
 243         return 0;
 244 }
 245
 246 static __u64
 247 smb2_get_next_mid(struct TCP_Server_Info *server)
 248 {
 249         __u64 mid;
 250         /* for SMB2 we need the current value */
 251         spin_lock(&GlobalMid_Lock);
 252         mid = server->CurrentMid++;
 253         spin_unlock(&GlobalMid_Lock);
 254         return mid;
 255 }
 256
 257 static void
 258 smb2_revert_current_mid(struct TCP_Server_Info *server, const unsigned int val)
 259 {
 260         spin_lock(&GlobalMid_Lock);
 261         if (server->CurrentMid >= val)
 262                 server->CurrentMid -= val;
 263         spin_unlock(&GlobalMid_Lock);
 264 }
 265
 266 static struct mid_q_entry *
 267 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
 268 {
 269         struct mid_q_entry *mid;
 270         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
 271         __u64 wire_mid = le64_to_cpu(shdr->MessageId);
 272
 273         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 274                 cifs_server_dbg(VFS, "Encrypted frame parsing not supported yet\n");
 275                 return NULL;
 276         }
 277
 278         spin_lock(&GlobalMid_Lock);
 279         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 280                 if ((mid->mid == wire_mid) &&
 281                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
 282                     (mid->command == shdr->Command)) {
 283                         kref_get(&mid->refcount);
 284                         spin_unlock(&GlobalMid_Lock);
 285                         return mid;
 286                 }
 287         }
 288         spin_unlock(&GlobalMid_Lock);
 289         return NULL;
 290 }
 291
 292 static void
 293 smb2_dump_detail(void *buf, struct TCP_Server_Info *server)
 294 {
 295 #ifdef CONFIG_CIFS_DEBUG2
 296         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
 297
 298         cifs_server_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
 299                  shdr->Command, shdr->Status, shdr->Flags, shdr->MessageId,
 300                  shdr->ProcessId);
 301         cifs_server_dbg(VFS, "smb buf %p len %u\n", buf,
 302                  server->ops->calc_smb_size(buf, server));
 303 #endif
 304 }
 305
 306 static bool
 307 smb2_need_neg(struct TCP_Server_Info *server)
 308 {
 309         return server->max_read == 0;
 310 }
 311
 312 static int
 313 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 314 {
 315         int rc;
 316
 317         cifs_ses_server(ses)->CurrentMid = 0;
 318         rc = SMB2_negotiate(xid, ses);
 319         /* BB we probably don't need to retry with modern servers */
 320         if (rc == -EAGAIN)
 321                 rc = -EHOSTDOWN;
 322         return rc;
 323 }
 324
 325 static unsigned int
 326 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 327 {
 328         struct TCP_Server_Info *server = tcon->ses->server;
 329         unsigned int wsize;
 330
 331         /* start with specified wsize, or default */
 332         wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
 333         wsize = min_t(unsigned int, wsize, server->max_write);
 334         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 335                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 336
 337         return wsize;
 338 }
 339
 340 static unsigned int
 341 smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 342 {
 343         struct TCP_Server_Info *server = tcon->ses->server;
 344         unsigned int wsize;
 345
 346         /* start with specified wsize, or default */
 347         wsize = volume_info->wsize ? volume_info->wsize : SMB3_DEFAULT_IOSIZE;
 348         wsize = min_t(unsigned int, wsize, server->max_write);
 349 #ifdef CONFIG_CIFS_SMB_DIRECT
 350         if (server->rdma) {
 351                 if (server->sign)
 352                         /*
 353                          * Account for SMB2 data transfer packet header and
 354                          * possible encryption header
 355                          */
 356                         wsize = min_t(unsigned int,
 357                                 wsize,
 358                                 server->smbd_conn->max_fragmented_send_size -
 359                                         SMB2_READWRITE_PDU_HEADER_SIZE -
 360                                         sizeof(struct smb2_transform_hdr));
 361                 else
 362                         wsize = min_t(unsigned int,
 363                                 wsize, server->smbd_conn->max_readwrite_size);
 364         }
 365 #endif
 366         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 367                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 368
 369         return wsize;
 370 }
 371
 372 static unsigned int
 373 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 374 {
 375         struct TCP_Server_Info *server = tcon->ses->server;
 376         unsigned int rsize;
 377
 378         /* start with specified rsize, or default */
 379         rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
 380         rsize = min_t(unsigned int, rsize, server->max_read);
 381
 382         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 383                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 384
 385         return rsize;
 386 }
 387
 388 static unsigned int
 389 smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 390 {
 391         struct TCP_Server_Info *server = tcon->ses->server;
 392         unsigned int rsize;
 393
 394         /* start with specified rsize, or default */
 395         rsize = volume_info->rsize ? volume_info->rsize : SMB3_DEFAULT_IOSIZE;
 396         rsize = min_t(unsigned int, rsize, server->max_read);
 397 #ifdef CONFIG_CIFS_SMB_DIRECT
 398         if (server->rdma) {
 399                 if (server->sign)
 400                         /*
 401                          * Account for SMB2 data transfer packet header and
 402                          * possible encryption header
 403                          */
 404                         rsize = min_t(unsigned int,
 405                                 rsize,
 406                                 server->smbd_conn->max_fragmented_recv_size -
 407                                         SMB2_READWRITE_PDU_HEADER_SIZE -
 408                                         sizeof(struct smb2_transform_hdr));
 409                 else
 410                         rsize = min_t(unsigned int,
 411                                 rsize, server->smbd_conn->max_readwrite_size);
 412         }
 413 #endif
 414
 415         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 416                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 417
 418         return rsize;
 419 }
 420
 421 static int
 422 parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf,
 423                         size_t buf_len,
 424                         struct cifs_server_iface **iface_list,
 425                         size_t *iface_count)
 426 {
 427         struct network_interface_info_ioctl_rsp *p;
 428         struct sockaddr_in *addr4;
 429         struct sockaddr_in6 *addr6;
 430         struct iface_info_ipv4 *p4;
 431         struct iface_info_ipv6 *p6;
 432         struct cifs_server_iface *info;
 433         ssize_t bytes_left;
 434         size_t next = 0;
 435         int nb_iface = 0;
 436         int rc = 0;
 437
 438         *iface_list = NULL;
 439         *iface_count = 0;
 440
 441         /*
 442          * Fist pass: count and sanity check
 443          */
 444
 445         bytes_left = buf_len;
 446         p = buf;
 447         while (bytes_left >= sizeof(*p)) {
 448                 nb_iface++;
 449                 next = le32_to_cpu(p->Next);
 450                 if (!next) {
 451                         bytes_left -= sizeof(*p);
 452                         break;
 453                 }
 454                 p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
 455                 bytes_left -= next;
 456         }
 457
 458         if (!nb_iface) {
 459                 cifs_dbg(VFS, "%s: malformed interface info\n", __func__);
 460                 rc = -EINVAL;
 461                 goto out;
 462         }
 463
 464         if (bytes_left || p->Next)
 465                 cifs_dbg(VFS, "%s: incomplete interface info\n", __func__);
 466
 467
 468         /*
 469          * Second pass: extract info to internal structure
 470          */
 471
 472         *iface_list = kcalloc(nb_iface, sizeof(**iface_list), GFP_KERNEL);
 473         if (!*iface_list) {
 474                 rc = -ENOMEM;
 475                 goto out;
 476         }
 477
 478         info = *iface_list;
 479         bytes_left = buf_len;
 480         p = buf;
 481         while (bytes_left >= sizeof(*p)) {
 482                 info->speed = le64_to_cpu(p->LinkSpeed);
 483                 info->rdma_capable = le32_to_cpu(p->Capability & RDMA_CAPABLE);
 484                 info->rss_capable = le32_to_cpu(p->Capability & RSS_CAPABLE);
 485
 486                 cifs_dbg(FYI, "%s: adding iface %zu\n", __func__, *iface_count);
 487                 cifs_dbg(FYI, "%s: speed %zu bps\n", __func__, info->speed);
 488                 cifs_dbg(FYI, "%s: capabilities 0x%08x\n", __func__,
 489                          le32_to_cpu(p->Capability));
 490
 491                 switch (p->Family) {
 492                 /*
 493                  * The kernel and wire socket structures have the same
 494                  * layout and use network byte order but make the
 495                  * conversion explicit in case either one changes.
 496                  */
 497                 case INTERNETWORK:
 498                         addr4 = (struct sockaddr_in *)&info->sockaddr;
 499                         p4 = (struct iface_info_ipv4 *)p->Buffer;
 500                         addr4->sin_family = AF_INET;
 501                         memcpy(&addr4->sin_addr, &p4->IPv4Address, 4);
 502
 503                         /* [MS-SMB2] 2.2.32.5.1.1 Clients MUST ignore these */
 504                         addr4->sin_port = cpu_to_be16(CIFS_PORT);
 505
 506                         cifs_dbg(FYI, "%s: ipv4 %pI4\n", __func__,
 507                                  &addr4->sin_addr);
 508                         break;
 509                 case INTERNETWORKV6:
 510                         addr6 = (struct sockaddr_in6 *)&info->sockaddr;
 511                         p6 = (struct iface_info_ipv6 *)p->Buffer;
 512                         addr6->sin6_family = AF_INET6;
 513                         memcpy(&addr6->sin6_addr, &p6->IPv6Address, 16);
 514
 515                         /* [MS-SMB2] 2.2.32.5.1.2 Clients MUST ignore these */
 516                         addr6->sin6_flowinfo = 0;
 517                         addr6->sin6_scope_id = 0;
 518                         addr6->sin6_port = cpu_to_be16(CIFS_PORT);
 519
 520                         cifs_dbg(FYI, "%s: ipv6 %pI6\n", __func__,
 521                                  &addr6->sin6_addr);
 522                         break;
 523                 default:
 524                         cifs_dbg(VFS,
 525                                  "%s: skipping unsupported socket family\n",
 526                                  __func__);
 527                         goto next_iface;
 528                 }
 529
 530                 (*iface_count)++;
 531                 info++;
 532 next_iface:
 533                 next = le32_to_cpu(p->Next);
 534                 if (!next)
 535                         break;
 536                 p = (struct network_interface_info_ioctl_rsp *)((u8 *)p+next);
 537                 bytes_left -= next;
 538         }
 539
 540         if (!*iface_count) {
 541                 rc = -EINVAL;
 542                 goto out;
 543         }
 544
 545 out:
 546         if (rc) {
 547                 kfree(*iface_list);
 548                 *iface_count = 0;
 549                 *iface_list = NULL;
 550         }
 551         return rc;
 552 }
 553
 554 static int compare_iface(const void *ia, const void *ib)
 555 {
 556         const struct cifs_server_iface *a = (struct cifs_server_iface *)ia;
 557         const struct cifs_server_iface *b = (struct cifs_server_iface *)ib;
 558
 559         return a->speed == b->speed ? 0 : (a->speed > b->speed ? -1 : 1);
 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         /* sort interfaces from fastest to slowest */
 591         sort(iface_list, iface_count, sizeof(*iface_list), compare_iface, NULL);
 592
 593         spin_lock(&ses->iface_lock);
 594         kfree(ses->iface_list);
 595         ses->iface_list = iface_list;
 596         ses->iface_count = iface_count;
 597         ses->iface_last_update = jiffies;
 598         spin_unlock(&ses->iface_lock);
 599
 600 out:
 601         kfree(out_buf);
 602         return rc;
 603 }
 604
 605 static void
 606 smb2_close_cached_fid(struct kref *ref)
 607 {
 608         struct cached_fid *cfid = container_of(ref, struct cached_fid,
 609                                                refcount);
 610
 611         if (cfid->is_valid) {
 612                 cifs_dbg(FYI, "clear cached root file handle\n");
 613                 SMB2_close(0, cfid->tcon, cfid->fid->persistent_fid,
 614                            cfid->fid->volatile_fid);
 615                 cfid->is_valid = false;
 616                 cfid->file_all_info_is_valid = false;
 617                 cfid->has_lease = false;
 618         }
 619 }
 620
 621 void close_shroot(struct cached_fid *cfid)
 622 {
 623         mutex_lock(&cfid->fid_mutex);
 624         kref_put(&cfid->refcount, smb2_close_cached_fid);
 625         mutex_unlock(&cfid->fid_mutex);
 626 }
 627
 628 void close_shroot_lease_locked(struct cached_fid *cfid)
 629 {
 630         if (cfid->has_lease) {
 631                 cfid->has_lease = false;
 632                 kref_put(&cfid->refcount, smb2_close_cached_fid);
 633         }
 634 }
 635
 636 void close_shroot_lease(struct cached_fid *cfid)
 637 {
 638         mutex_lock(&cfid->fid_mutex);
 639         close_shroot_lease_locked(cfid);
 640         mutex_unlock(&cfid->fid_mutex);
 641 }
 642
 643 void
 644 smb2_cached_lease_break(struct work_struct *work)
 645 {
 646         struct cached_fid *cfid = container_of(work,
 647                                 struct cached_fid, lease_break);
 648
 649         close_shroot_lease(cfid);
 650 }
 651
 652 /*
 653  * Open the directory at the root of a share
 654  */
 655 int open_shroot(unsigned int xid, struct cifs_tcon *tcon,
 656                 struct cifs_sb_info *cifs_sb,
 657                 struct cached_fid **cfid)
 658 {
 659         struct cifs_ses *ses = tcon->ses;
 660         struct TCP_Server_Info *server = ses->server;
 661         struct cifs_open_parms oparms;
 662         struct smb2_create_rsp *o_rsp = NULL;
 663         struct smb2_query_info_rsp *qi_rsp = NULL;
 664         int resp_buftype[2];
 665         struct smb_rqst rqst[2];
 666         struct kvec rsp_iov[2];
 667         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
 668         struct kvec qi_iov[1];
 669         int rc, flags = 0;
 670         __le16 utf16_path = 0; /* Null - since an open of top of share */
 671         u8 oplock = SMB2_OPLOCK_LEVEL_II;
 672         struct cifs_fid *pfid;
 673
 674         mutex_lock(&tcon->crfid.fid_mutex);
 675         if (tcon->crfid.is_valid) {
 676                 cifs_dbg(FYI, "found a cached root file handle\n");
 677                 *cfid = &tcon->crfid;
 678                 kref_get(&tcon->crfid.refcount);
 679                 mutex_unlock(&tcon->crfid.fid_mutex);
 680                 return 0;
 681         }
 682
 683         /*
 684          * We do not hold the lock for the open because in case
 685          * SMB2_open needs to reconnect, it will end up calling
 686          * cifs_mark_open_files_invalid() which takes the lock again
 687          * thus causing a deadlock
 688          */
 689
 690         mutex_unlock(&tcon->crfid.fid_mutex);
 691
 692         if (smb3_encryption_required(tcon))
 693                 flags |= CIFS_TRANSFORM_REQ;
 694
 695         if (!server->ops->new_lease_key)
 696                 return -EIO;
 697
 698         pfid = tcon->crfid.fid;
 699         server->ops->new_lease_key(pfid);
 700
 701         memset(rqst, 0, sizeof(rqst));
 702         resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
 703         memset(rsp_iov, 0, sizeof(rsp_iov));
 704
 705         /* Open */
 706         memset(&open_iov, 0, sizeof(open_iov));
 707         rqst[0].rq_iov = open_iov;
 708         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
 709
 710         oparms.tcon = tcon;
 711         oparms.create_options = cifs_create_options(cifs_sb, 0);
 712         oparms.desired_access = FILE_READ_ATTRIBUTES;
 713         oparms.disposition = FILE_OPEN;
 714         oparms.fid = pfid;
 715         oparms.reconnect = false;
 716
 717         rc = SMB2_open_init(tcon, server,
 718                             &rqst[0], &oplock, &oparms, &utf16_path);
 719         if (rc)
 720                 goto oshr_free;
 721         smb2_set_next_command(tcon, &rqst[0]);
 722
 723         memset(&qi_iov, 0, sizeof(qi_iov));
 724         rqst[1].rq_iov = qi_iov;
 725         rqst[1].rq_nvec = 1;
 726
 727         rc = SMB2_query_info_init(tcon, server,
 728                                   &rqst[1], COMPOUND_FID,
 729                                   COMPOUND_FID, FILE_ALL_INFORMATION,
 730                                   SMB2_O_INFO_FILE, 0,
 731                                   sizeof(struct smb2_file_all_info) +
 732                                   PATH_MAX * 2, 0, NULL);
 733         if (rc)
 734                 goto oshr_free;
 735
 736         smb2_set_related(&rqst[1]);
 737
 738         rc = compound_send_recv(xid, ses, server,
 739                                 flags, 2, rqst,
 740                                 resp_buftype, rsp_iov);
 741         mutex_lock(&tcon->crfid.fid_mutex);
 742
 743         /*
 744          * Now we need to check again as the cached root might have
 745          * been successfully re-opened from a concurrent process
 746          */
 747
 748         if (tcon->crfid.is_valid) {
 749                 /* work was already done */
 750
 751                 /* stash fids for close() later */
 752                 struct cifs_fid fid = {
 753                         .persistent_fid = pfid->persistent_fid,
 754                         .volatile_fid = pfid->volatile_fid,
 755                 };
 756
 757                 /*
 758                  * caller expects this func to set pfid to a valid
 759                  * cached root, so we copy the existing one and get a
 760                  * reference.
 761                  */
 762                 memcpy(pfid, tcon->crfid.fid, sizeof(*pfid));
 763                 kref_get(&tcon->crfid.refcount);
 764
 765                 mutex_unlock(&tcon->crfid.fid_mutex);
 766
 767                 if (rc == 0) {
 768                         /* close extra handle outside of crit sec */
 769                         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 770                 }
 771                 rc = 0;
 772                 goto oshr_free;
 773         }
 774
 775         /* Cached root is still invalid, continue normaly */
 776
 777         if (rc) {
 778                 if (rc == -EREMCHG) {
 779                         tcon->need_reconnect = true;
 780                         pr_warn_once("server share %s deleted\n",
 781                                      tcon->treeName);
 782                 }
 783                 goto oshr_exit;
 784         }
 785
 786         atomic_inc(&tcon->num_remote_opens);
 787
 788         o_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
 789         oparms.fid->persistent_fid = o_rsp->PersistentFileId;
 790         oparms.fid->volatile_fid = o_rsp->VolatileFileId;
 791 #ifdef CONFIG_CIFS_DEBUG2
 792         oparms.fid->mid = le64_to_cpu(o_rsp->sync_hdr.MessageId);
 793 #endif /* CIFS_DEBUG2 */
 794
 795         memcpy(tcon->crfid.fid, pfid, sizeof(struct cifs_fid));
 796         tcon->crfid.tcon = tcon;
 797         tcon->crfid.is_valid = true;
 798         kref_init(&tcon->crfid.refcount);
 799
 800         /* BB TBD check to see if oplock level check can be removed below */
 801         if (o_rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE) {
 802                 kref_get(&tcon->crfid.refcount);
 803                 tcon->crfid.has_lease = true;
 804                 smb2_parse_contexts(server, o_rsp,
 805                                 &oparms.fid->epoch,
 806                                     oparms.fid->lease_key, &oplock,
 807                                     NULL, NULL);
 808         } else
 809                 goto oshr_exit;
 810
 811         qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
 812         if (le32_to_cpu(qi_rsp->OutputBufferLength) < sizeof(struct smb2_file_all_info))
 813                 goto oshr_exit;
 814         if (!smb2_validate_and_copy_iov(
 815                                 le16_to_cpu(qi_rsp->OutputBufferOffset),
 816                                 sizeof(struct smb2_file_all_info),
 817                                 &rsp_iov[1], sizeof(struct smb2_file_all_info),
 818                                 (char *)&tcon->crfid.file_all_info))
 819                 tcon->crfid.file_all_info_is_valid = true;
 820
 821 oshr_exit:
 822         mutex_unlock(&tcon->crfid.fid_mutex);
 823 oshr_free:
 824         SMB2_open_free(&rqst[0]);
 825         SMB2_query_info_free(&rqst[1]);
 826         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
 827         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
 828         if (rc == 0)
 829                 *cfid = &tcon->crfid;
 830         return rc;
 831 }
 832
 833 static void
 834 smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
 835               struct cifs_sb_info *cifs_sb)
 836 {
 837         int rc;
 838         __le16 srch_path = 0; /* Null - open root of share */
 839         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 840         struct cifs_open_parms oparms;
 841         struct cifs_fid fid;
 842         bool no_cached_open = tcon->nohandlecache;
 843         struct cached_fid *cfid = NULL;
 844
 845         oparms.tcon = tcon;
 846         oparms.desired_access = FILE_READ_ATTRIBUTES;
 847         oparms.disposition = FILE_OPEN;
 848         oparms.create_options = cifs_create_options(cifs_sb, 0);
 849         oparms.fid = &fid;
 850         oparms.reconnect = false;
 851
 852         if (no_cached_open) {
 853                 rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
 854                                NULL, NULL);
 855         } else {
 856                 rc = open_shroot(xid, tcon, cifs_sb, &cfid);
 857                 if (rc == 0)
 858                         memcpy(&fid, cfid->fid, sizeof(struct cifs_fid));
 859         }
 860         if (rc)
 861                 return;
 862
 863         SMB3_request_interfaces(xid, tcon);
 864
 865         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 866                         FS_ATTRIBUTE_INFORMATION);
 867         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 868                         FS_DEVICE_INFORMATION);
 869         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 870                         FS_VOLUME_INFORMATION);
 871         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 872                         FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
 873         if (no_cached_open)
 874                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 875         else
 876                 close_shroot(cfid);
 877 }
 878
 879 static void
 880 smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,
 881               struct cifs_sb_info *cifs_sb)
 882 {
 883         int rc;
 884         __le16 srch_path = 0; /* Null - open root of share */
 885         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 886         struct cifs_open_parms oparms;
 887         struct cifs_fid fid;
 888
 889         oparms.tcon = tcon;
 890         oparms.desired_access = FILE_READ_ATTRIBUTES;
 891         oparms.disposition = FILE_OPEN;
 892         oparms.create_options = cifs_create_options(cifs_sb, 0);
 893         oparms.fid = &fid;
 894         oparms.reconnect = false;
 895
 896         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
 897                        NULL, NULL);
 898         if (rc)
 899                 return;
 900
 901         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 902                         FS_ATTRIBUTE_INFORMATION);
 903         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 904                         FS_DEVICE_INFORMATION);
 905         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 906 }
 907
 908 static int
 909 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 910                         struct cifs_sb_info *cifs_sb, const char *full_path)
 911 {
 912         int rc;
 913         __le16 *utf16_path;
 914         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 915         struct cifs_open_parms oparms;
 916         struct cifs_fid fid;
 917
 918         if ((*full_path == 0) && tcon->crfid.is_valid)
 919                 return 0;
 920
 921         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 922         if (!utf16_path)
 923                 return -ENOMEM;
 924
 925         oparms.tcon = tcon;
 926         oparms.desired_access = FILE_READ_ATTRIBUTES;
 927         oparms.disposition = FILE_OPEN;
 928         oparms.create_options = cifs_create_options(cifs_sb, 0);
 929         oparms.fid = &fid;
 930         oparms.reconnect = false;
 931
 932         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
 933                        NULL);
 934         if (rc) {
 935                 kfree(utf16_path);
 936                 return rc;
 937         }
 938
 939         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 940         kfree(utf16_path);
 941         return rc;
 942 }
 943
 944 static int
 945 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 946                   struct cifs_sb_info *cifs_sb, const char *full_path,
 947                   u64 *uniqueid, FILE_ALL_INFO *data)
 948 {
 949         *uniqueid = le64_to_cpu(data->IndexNumber);
 950         return 0;
 951 }
 952
 953 static int
 954 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 955                      struct cifs_fid *fid, FILE_ALL_INFO *data)
 956 {
 957         int rc;
 958         struct smb2_file_all_info *smb2_data;
 959
 960         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 961                             GFP_KERNEL);
 962         if (smb2_data == NULL)
 963                 return -ENOMEM;
 964
 965         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
 966                              smb2_data);
 967         if (!rc)
 968                 move_smb2_info_to_cifs(data, smb2_data);
 969         kfree(smb2_data);
 970         return rc;
 971 }
 972
 973 #ifdef CONFIG_CIFS_XATTR
 974 static ssize_t
 975 move_smb2_ea_to_cifs(char *dst, size_t dst_size,
 976                      struct smb2_file_full_ea_info *src, size_t src_size,
 977                      const unsigned char *ea_name)
 978 {
 979         int rc = 0;
 980         unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0;
 981         char *name, *value;
 982         size_t buf_size = dst_size;
 983         size_t name_len, value_len, user_name_len;
 984
 985         while (src_size > 0) {
 986                 name = &src->ea_data[0];
 987                 name_len = (size_t)src->ea_name_length;
 988                 value = &src->ea_data[src->ea_name_length + 1];
 989                 value_len = (size_t)le16_to_cpu(src->ea_value_length);
 990
 991                 if (name_len == 0)
 992                         break;
 993
 994                 if (src_size < 8 + name_len + 1 + value_len) {
 995                         cifs_dbg(FYI, "EA entry goes beyond length of list\n");
 996                         rc = -EIO;
 997                         goto out;
 998                 }
 999
1000                 if (ea_name) {
1001                         if (ea_name_len == name_len &&
1002                             memcmp(ea_name, name, name_len) == 0) {
1003                                 rc = value_len;
1004                                 if (dst_size == 0)
1005                                         goto out;
1006                                 if (dst_size < value_len) {
1007                                         rc = -ERANGE;
1008                                         goto out;
1009                                 }
1010                                 memcpy(dst, value, value_len);
1011                                 goto out;
1012                         }
1013                 } else {
1014                         /* 'user.' plus a terminating null */
1015                         user_name_len = 5 + 1 + name_len;
1016
1017                         if (buf_size == 0) {
1018                                 /* skip copy - calc size only */
1019                                 rc += user_name_len;
1020                         } else if (dst_size >= user_name_len) {
1021                                 dst_size -= user_name_len;
1022                                 memcpy(dst, "user.", 5);
1023                                 dst += 5;
1024                                 memcpy(dst, src->ea_data, name_len);
1025                                 dst += name_len;
1026                                 *dst = 0;
1027                                 ++dst;
1028                                 rc += user_name_len;
1029                         } else {
1030                                 /* stop before overrun buffer */
1031                                 rc = -ERANGE;
1032                                 break;
1033                         }
1034                 }
1035
1036                 if (!src->next_entry_offset)
1037                         break;
1038
1039                 if (src_size < le32_to_cpu(src->next_entry_offset)) {
1040                         /* stop before overrun buffer */
1041                         rc = -ERANGE;
1042                         break;
1043                 }
1044                 src_size -= le32_to_cpu(src->next_entry_offset);
1045                 src = (void *)((char *)src +
1046                                le32_to_cpu(src->next_entry_offset));
1047         }
1048
1049         /* didn't find the named attribute */
1050         if (ea_name)
1051                 rc = -ENODATA;
1052
1053 out:
1054         return (ssize_t)rc;
1055 }
1056
1057 static ssize_t
1058 smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
1059                const unsigned char *path, const unsigned char *ea_name,
1060                char *ea_data, size_t buf_size,
1061                struct cifs_sb_info *cifs_sb)
1062 {
1063         int rc;
1064         __le16 *utf16_path;
1065         struct kvec rsp_iov = {NULL, 0};
1066         int buftype = CIFS_NO_BUFFER;
1067         struct smb2_query_info_rsp *rsp;
1068         struct smb2_file_full_ea_info *info = NULL;
1069
1070         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1071         if (!utf16_path)
1072                 return -ENOMEM;
1073
1074         rc = smb2_query_info_compound(xid, tcon, utf16_path,
1075                                       FILE_READ_EA,
1076                                       FILE_FULL_EA_INFORMATION,
1077                                       SMB2_O_INFO_FILE,
1078                                       CIFSMaxBufSize -
1079                                       MAX_SMB2_CREATE_RESPONSE_SIZE -
1080                                       MAX_SMB2_CLOSE_RESPONSE_SIZE,
1081                                       &rsp_iov, &buftype, cifs_sb);
1082         if (rc) {
1083                 /*
1084                  * If ea_name is NULL (listxattr) and there are no EAs,
1085                  * return 0 as it's not an error. Otherwise, the specified
1086                  * ea_name was not found.
1087                  */
1088                 if (!ea_name && rc == -ENODATA)
1089                         rc = 0;
1090                 goto qeas_exit;
1091         }
1092
1093         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
1094         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
1095                                le32_to_cpu(rsp->OutputBufferLength),
1096                                &rsp_iov,
1097                                sizeof(struct smb2_file_full_ea_info));
1098         if (rc)
1099                 goto qeas_exit;
1100
1101         info = (struct smb2_file_full_ea_info *)(
1102                         le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
1103         rc = move_smb2_ea_to_cifs(ea_data, buf_size, info,
1104                         le32_to_cpu(rsp->OutputBufferLength), ea_name);
1105
1106  qeas_exit:
1107         kfree(utf16_path);
1108         free_rsp_buf(buftype, rsp_iov.iov_base);
1109         return rc;
1110 }
1111
1112
1113 static int
1114 smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
1115             const char *path, const char *ea_name, const void *ea_value,
1116             const __u16 ea_value_len, const struct nls_table *nls_codepage,
1117             struct cifs_sb_info *cifs_sb)
1118 {
1119         struct cifs_ses *ses = tcon->ses;
1120         struct TCP_Server_Info *server = cifs_pick_channel(ses);
1121         __le16 *utf16_path = NULL;
1122         int ea_name_len = strlen(ea_name);
1123         int flags = 0;
1124         int len;
1125         struct smb_rqst rqst[3];
1126         int resp_buftype[3];
1127         struct kvec rsp_iov[3];
1128         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1129         struct cifs_open_parms oparms;
1130         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1131         struct cifs_fid fid;
1132         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
1133         unsigned int size[1];
1134         void *data[1];
1135         struct smb2_file_full_ea_info *ea = NULL;
1136         struct kvec close_iov[1];
1137         struct smb2_query_info_rsp *rsp;
1138         int rc, used_len = 0;
1139
1140         if (smb3_encryption_required(tcon))
1141                 flags |= CIFS_TRANSFORM_REQ;
1142
1143         if (ea_name_len > 255)
1144                 return -EINVAL;
1145
1146         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1147         if (!utf16_path)
1148                 return -ENOMEM;
1149
1150         memset(rqst, 0, sizeof(rqst));
1151         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1152         memset(rsp_iov, 0, sizeof(rsp_iov));
1153
1154         if (ses->server->ops->query_all_EAs) {
1155                 if (!ea_value) {
1156                         rc = ses->server->ops->query_all_EAs(xid, tcon, path,
1157                                                              ea_name, NULL, 0,
1158                                                              cifs_sb);
1159                         if (rc == -ENODATA)
1160                                 goto sea_exit;
1161                 } else {
1162                         /* If we are adding a attribute we should first check
1163                          * if there will be enough space available to store
1164                          * the new EA. If not we should not add it since we
1165                          * would not be able to even read the EAs back.
1166                          */
1167                         rc = smb2_query_info_compound(xid, tcon, utf16_path,
1168                                       FILE_READ_EA,
1169                                       FILE_FULL_EA_INFORMATION,
1170                                       SMB2_O_INFO_FILE,
1171                                       CIFSMaxBufSize -
1172                                       MAX_SMB2_CREATE_RESPONSE_SIZE -
1173                                       MAX_SMB2_CLOSE_RESPONSE_SIZE,
1174                                       &rsp_iov[1], &resp_buftype[1], cifs_sb);
1175                         if (rc == 0) {
1176                                 rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
1177                                 used_len = le32_to_cpu(rsp->OutputBufferLength);
1178                         }
1179                         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1180                         resp_buftype[1] = CIFS_NO_BUFFER;
1181                         memset(&rsp_iov[1], 0, sizeof(rsp_iov[1]));
1182                         rc = 0;
1183
1184                         /* Use a fudge factor of 256 bytes in case we collide
1185                          * with a different set_EAs command.
1186                          */
1187                         if(CIFSMaxBufSize - MAX_SMB2_CREATE_RESPONSE_SIZE -
1188                            MAX_SMB2_CLOSE_RESPONSE_SIZE - 256 <
1189                            used_len + ea_name_len + ea_value_len + 1) {
1190                                 rc = -ENOSPC;
1191                                 goto sea_exit;
1192                         }
1193                 }
1194         }
1195
1196         /* Open */
1197         memset(&open_iov, 0, sizeof(open_iov));
1198         rqst[0].rq_iov = open_iov;
1199         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1200
1201         memset(&oparms, 0, sizeof(oparms));
1202         oparms.tcon = tcon;
1203         oparms.desired_access = FILE_WRITE_EA;
1204         oparms.disposition = FILE_OPEN;
1205         oparms.create_options = cifs_create_options(cifs_sb, 0);
1206         oparms.fid = &fid;
1207         oparms.reconnect = false;
1208
1209         rc = SMB2_open_init(tcon, server,
1210                             &rqst[0], &oplock, &oparms, utf16_path);
1211         if (rc)
1212                 goto sea_exit;
1213         smb2_set_next_command(tcon, &rqst[0]);
1214
1215
1216         /* Set Info */
1217         memset(&si_iov, 0, sizeof(si_iov));
1218         rqst[1].rq_iov = si_iov;
1219         rqst[1].rq_nvec = 1;
1220
1221         len = sizeof(*ea) + ea_name_len + ea_value_len + 1;
1222         ea = kzalloc(len, GFP_KERNEL);
1223         if (ea == NULL) {
1224                 rc = -ENOMEM;
1225                 goto sea_exit;
1226         }
1227
1228         ea->ea_name_length = ea_name_len;
1229         ea->ea_value_length = cpu_to_le16(ea_value_len);
1230         memcpy(ea->ea_data, ea_name, ea_name_len + 1);
1231         memcpy(ea->ea_data + ea_name_len + 1, ea_value, ea_value_len);
1232
1233         size[0] = len;
1234         data[0] = ea;
1235
1236         rc = SMB2_set_info_init(tcon, server,
1237                                 &rqst[1], COMPOUND_FID,
1238                                 COMPOUND_FID, current->tgid,
1239                                 FILE_FULL_EA_INFORMATION,
1240                                 SMB2_O_INFO_FILE, 0, data, size);
1241         smb2_set_next_command(tcon, &rqst[1]);
1242         smb2_set_related(&rqst[1]);
1243
1244
1245         /* Close */
1246         memset(&close_iov, 0, sizeof(close_iov));
1247         rqst[2].rq_iov = close_iov;
1248         rqst[2].rq_nvec = 1;
1249         rc = SMB2_close_init(tcon, server,
1250                              &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
1251         smb2_set_related(&rqst[2]);
1252
1253         rc = compound_send_recv(xid, ses, server,
1254                                 flags, 3, rqst,
1255                                 resp_buftype, rsp_iov);
1256         /* no need to bump num_remote_opens because handle immediately closed */
1257
1258  sea_exit:
1259         kfree(ea);
1260         kfree(utf16_path);
1261         SMB2_open_free(&rqst[0]);
1262         SMB2_set_info_free(&rqst[1]);
1263         SMB2_close_free(&rqst[2]);
1264         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1265         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1266         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1267         return rc;
1268 }
1269 #endif
1270
1271 static bool
1272 smb2_can_echo(struct TCP_Server_Info *server)
1273 {
1274         return server->echoes;
1275 }
1276
1277 static void
1278 smb2_clear_stats(struct cifs_tcon *tcon)
1279 {
1280         int i;
1281
1282         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
1283                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
1284                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
1285         }
1286 }
1287
1288 static void
1289 smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
1290 {
1291         seq_puts(m, "\n\tShare Capabilities:");
1292         if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
1293                 seq_puts(m, " DFS,");
1294         if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
1295                 seq_puts(m, " CONTINUOUS AVAILABILITY,");
1296         if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
1297                 seq_puts(m, " SCALEOUT,");
1298         if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
1299                 seq_puts(m, " CLUSTER,");
1300         if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
1301                 seq_puts(m, " ASYMMETRIC,");
1302         if (tcon->capabilities == 0)
1303                 seq_puts(m, " None");
1304         if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
1305                 seq_puts(m, " Aligned,");
1306         if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
1307                 seq_puts(m, " Partition Aligned,");
1308         if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
1309                 seq_puts(m, " SSD,");
1310         if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
1311                 seq_puts(m, " TRIM-support,");
1312
1313         seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
1314         seq_printf(m, "\n\ttid: 0x%x", tcon->tid);
1315         if (tcon->perf_sector_size)
1316                 seq_printf(m, "\tOptimal sector size: 0x%x",
1317                            tcon->perf_sector_size);
1318         seq_printf(m, "\tMaximal Access: 0x%x", tcon->maximal_access);
1319 }
1320
1321 static void
1322 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
1323 {
1324         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
1325         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
1326
1327         /*
1328          *  Can't display SMB2_NEGOTIATE, SESSION_SETUP, LOGOFF, CANCEL and ECHO
1329          *  totals (requests sent) since those SMBs are per-session not per tcon
1330          */
1331         seq_printf(m, "\nBytes read: %llu  Bytes written: %llu",
1332                    (long long)(tcon->bytes_read),
1333                    (long long)(tcon->bytes_written));
1334         seq_printf(m, "\nOpen files: %d total (local), %d open on server",
1335                    atomic_read(&tcon->num_local_opens),
1336                    atomic_read(&tcon->num_remote_opens));
1337         seq_printf(m, "\nTreeConnects: %d total %d failed",
1338                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
1339                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
1340         seq_printf(m, "\nTreeDisconnects: %d total %d failed",
1341                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
1342                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
1343         seq_printf(m, "\nCreates: %d total %d failed",
1344                    atomic_read(&sent[SMB2_CREATE_HE]),
1345                    atomic_read(&failed[SMB2_CREATE_HE]));
1346         seq_printf(m, "\nCloses: %d total %d failed",
1347                    atomic_read(&sent[SMB2_CLOSE_HE]),
1348                    atomic_read(&failed[SMB2_CLOSE_HE]));
1349         seq_printf(m, "\nFlushes: %d total %d failed",
1350                    atomic_read(&sent[SMB2_FLUSH_HE]),
1351                    atomic_read(&failed[SMB2_FLUSH_HE]));
1352         seq_printf(m, "\nReads: %d total %d failed",
1353                    atomic_read(&sent[SMB2_READ_HE]),
1354                    atomic_read(&failed[SMB2_READ_HE]));
1355         seq_printf(m, "\nWrites: %d total %d failed",
1356                    atomic_read(&sent[SMB2_WRITE_HE]),
1357                    atomic_read(&failed[SMB2_WRITE_HE]));
1358         seq_printf(m, "\nLocks: %d total %d failed",
1359                    atomic_read(&sent[SMB2_LOCK_HE]),
1360                    atomic_read(&failed[SMB2_LOCK_HE]));
1361         seq_printf(m, "\nIOCTLs: %d total %d failed",
1362                    atomic_read(&sent[SMB2_IOCTL_HE]),
1363                    atomic_read(&failed[SMB2_IOCTL_HE]));
1364         seq_printf(m, "\nQueryDirectories: %d total %d failed",
1365                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
1366                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
1367         seq_printf(m, "\nChangeNotifies: %d total %d failed",
1368                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
1369                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
1370         seq_printf(m, "\nQueryInfos: %d total %d failed",
1371                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
1372                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
1373         seq_printf(m, "\nSetInfos: %d total %d failed",
1374                    atomic_read(&sent[SMB2_SET_INFO_HE]),
1375                    atomic_read(&failed[SMB2_SET_INFO_HE]));
1376         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
1377                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
1378                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
1379 }
1380
1381 static void
1382 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
1383 {
1384         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
1385         struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
1386
1387         cfile->fid.persistent_fid = fid->persistent_fid;
1388         cfile->fid.volatile_fid = fid->volatile_fid;
1389         cfile->fid.access = fid->access;
1390 #ifdef CONFIG_CIFS_DEBUG2
1391         cfile->fid.mid = fid->mid;
1392 #endif /* CIFS_DEBUG2 */
1393         server->ops->set_oplock_level(cinode, oplock, fid->epoch,
1394                                       &fid->purge_cache);
1395         cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
1396         memcpy(cfile->fid.create_guid, fid->create_guid, 16);
1397 }
1398
1399 static void
1400 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
1401                 struct cifs_fid *fid)
1402 {
1403         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1404 }
1405
1406 static void
1407 smb2_close_getattr(const unsigned int xid, struct cifs_tcon *tcon,
1408                    struct cifsFileInfo *cfile)
1409 {
1410         struct smb2_file_network_open_info file_inf;
1411         struct inode *inode;
1412         int rc;
1413
1414         rc = __SMB2_close(xid, tcon, cfile->fid.persistent_fid,
1415                    cfile->fid.volatile_fid, &file_inf);
1416         if (rc)
1417                 return;
1418
1419         inode = d_inode(cfile->dentry);
1420
1421         spin_lock(&inode->i_lock);
1422         CIFS_I(inode)->time = jiffies;
1423
1424         /* Creation time should not need to be updated on close */
1425         if (file_inf.LastWriteTime)
1426                 inode->i_mtime = cifs_NTtimeToUnix(file_inf.LastWriteTime);
1427         if (file_inf.ChangeTime)
1428                 inode->i_ctime = cifs_NTtimeToUnix(file_inf.ChangeTime);
1429         if (file_inf.LastAccessTime)
1430                 inode->i_atime = cifs_NTtimeToUnix(file_inf.LastAccessTime);
1431
1432         /*
1433          * i_blocks is not related to (i_size / i_blksize),
1434          * but instead 512 byte (2**9) size is required for
1435          * calculating num blocks.
1436          */
1437         if (le64_to_cpu(file_inf.AllocationSize) > 4096)
1438                 inode->i_blocks =
1439                         (512 - 1 + le64_to_cpu(file_inf.AllocationSize)) >> 9;
1440
1441         /* End of file and Attributes should not have to be updated on close */
1442         spin_unlock(&inode->i_lock);
1443 }
1444
1445 static int
1446 SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
1447                      u64 persistent_fid, u64 volatile_fid,
1448                      struct copychunk_ioctl *pcchunk)
1449 {
1450         int rc;
1451         unsigned int ret_data_len;
1452         struct resume_key_req *res_key;
1453
1454         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1455                         FSCTL_SRV_REQUEST_RESUME_KEY, true /* is_fsctl */,
1456                         NULL, 0 /* no input */, CIFSMaxBufSize,
1457                         (char **)&res_key, &ret_data_len);
1458
1459         if (rc) {
1460                 cifs_tcon_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
1461                 goto req_res_key_exit;
1462         }
1463         if (ret_data_len < sizeof(struct resume_key_req)) {
1464                 cifs_tcon_dbg(VFS, "Invalid refcopy resume key length\n");
1465                 rc = -EINVAL;
1466                 goto req_res_key_exit;
1467         }
1468         memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
1469
1470 req_res_key_exit:
1471         kfree(res_key);
1472         return rc;
1473 }
1474
1475 struct iqi_vars {
1476         struct smb_rqst rqst[3];
1477         struct kvec rsp_iov[3];
1478         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
1479         struct kvec qi_iov[1];
1480         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
1481         struct kvec si_iov[SMB2_SET_INFO_IOV_SIZE];
1482         struct kvec close_iov[1];
1483 };
1484
1485 static int
1486 smb2_ioctl_query_info(const unsigned int xid,
1487                       struct cifs_tcon *tcon,
1488                       struct cifs_sb_info *cifs_sb,
1489                       __le16 *path, int is_dir,
1490                       unsigned long p)
1491 {
1492         struct iqi_vars *vars;
1493         struct smb_rqst *rqst;
1494         struct kvec *rsp_iov;
1495         struct cifs_ses *ses = tcon->ses;
1496         struct TCP_Server_Info *server = cifs_pick_channel(ses);
1497         char __user *arg = (char __user *)p;
1498         struct smb_query_info qi;
1499         struct smb_query_info __user *pqi;
1500         int rc = 0;
1501         int flags = 0;
1502         struct smb2_query_info_rsp *qi_rsp = NULL;
1503         struct smb2_ioctl_rsp *io_rsp = NULL;
1504         void *buffer = NULL;
1505         int resp_buftype[3];
1506         struct cifs_open_parms oparms;
1507         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1508         struct cifs_fid fid;
1509         unsigned int size[2];
1510         void *data[2];
1511         int create_options = is_dir ? CREATE_NOT_FILE : CREATE_NOT_DIR;
1512
1513         vars = kzalloc(sizeof(*vars), GFP_ATOMIC);
1514         if (vars == NULL)
1515                 return -ENOMEM;
1516         rqst = &vars->rqst[0];
1517         rsp_iov = &vars->rsp_iov[0];
1518
1519         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
1520
1521         if (copy_from_user(&qi, arg, sizeof(struct smb_query_info)))
1522                 goto e_fault;
1523
1524         if (qi.output_buffer_length > 1024) {
1525                 kfree(vars);
1526                 return -EINVAL;
1527         }
1528
1529         if (!ses || !server) {
1530                 kfree(vars);
1531                 return -EIO;
1532         }
1533
1534         if (smb3_encryption_required(tcon))
1535                 flags |= CIFS_TRANSFORM_REQ;
1536
1537         buffer = memdup_user(arg + sizeof(struct smb_query_info),
1538                              qi.output_buffer_length);
1539         if (IS_ERR(buffer)) {
1540                 kfree(vars);
1541                 return PTR_ERR(buffer);
1542         }
1543
1544         /* Open */
1545         rqst[0].rq_iov = &vars->open_iov[0];
1546         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
1547
1548         memset(&oparms, 0, sizeof(oparms));
1549         oparms.tcon = tcon;
1550         oparms.disposition = FILE_OPEN;
1551         oparms.create_options = cifs_create_options(cifs_sb, create_options);
1552         oparms.fid = &fid;
1553         oparms.reconnect = false;
1554
1555         if (qi.flags & PASSTHRU_FSCTL) {
1556                 switch (qi.info_type & FSCTL_DEVICE_ACCESS_MASK) {
1557                 case FSCTL_DEVICE_ACCESS_FILE_READ_WRITE_ACCESS:
1558                         oparms.desired_access = FILE_READ_DATA | FILE_WRITE_DATA | FILE_READ_ATTRIBUTES | SYNCHRONIZE;
1559                         break;
1560                 case FSCTL_DEVICE_ACCESS_FILE_ANY_ACCESS:
1561                         oparms.desired_access = GENERIC_ALL;
1562                         break;
1563                 case FSCTL_DEVICE_ACCESS_FILE_READ_ACCESS:
1564                         oparms.desired_access = GENERIC_READ;
1565                         break;
1566                 case FSCTL_DEVICE_ACCESS_FILE_WRITE_ACCESS:
1567                         oparms.desired_access = GENERIC_WRITE;
1568                         break;
1569                 }
1570         } else if (qi.flags & PASSTHRU_SET_INFO) {
1571                 oparms.desired_access = GENERIC_WRITE;
1572         } else {
1573                 oparms.desired_access = FILE_READ_ATTRIBUTES | READ_CONTROL;
1574         }
1575
1576         rc = SMB2_open_init(tcon, server,
1577                             &rqst[0], &oplock, &oparms, path);
1578         if (rc)
1579                 goto iqinf_exit;
1580         smb2_set_next_command(tcon, &rqst[0]);
1581
1582         /* Query */
1583         if (qi.flags & PASSTHRU_FSCTL) {
1584                 /* Can eventually relax perm check since server enforces too */
1585                 if (!capable(CAP_SYS_ADMIN))
1586                         rc = -EPERM;
1587                 else  {
1588                         rqst[1].rq_iov = &vars->io_iov[0];
1589                         rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
1590
1591                         rc = SMB2_ioctl_init(tcon, server,
1592                                              &rqst[1],
1593                                              COMPOUND_FID, COMPOUND_FID,
1594                                              qi.info_type, true, buffer,
1595                                              qi.output_buffer_length,
1596                                              CIFSMaxBufSize -
1597                                              MAX_SMB2_CREATE_RESPONSE_SIZE -
1598                                              MAX_SMB2_CLOSE_RESPONSE_SIZE);
1599                 }
1600         } else if (qi.flags == PASSTHRU_SET_INFO) {
1601                 /* Can eventually relax perm check since server enforces too */
1602                 if (!capable(CAP_SYS_ADMIN))
1603                         rc = -EPERM;
1604                 else  {
1605                         rqst[1].rq_iov = &vars->si_iov[0];
1606                         rqst[1].rq_nvec = 1;
1607
1608                         size[0] = 8;
1609                         data[0] = buffer;
1610
1611                         rc = SMB2_set_info_init(tcon, server,
1612                                         &rqst[1],
1613                                         COMPOUND_FID, COMPOUND_FID,
1614                                         current->tgid,
1615                                         FILE_END_OF_FILE_INFORMATION,
1616                                         SMB2_O_INFO_FILE, 0, data, size);
1617                 }
1618         } else if (qi.flags == PASSTHRU_QUERY_INFO) {
1619                 rqst[1].rq_iov = &vars->qi_iov[0];
1620                 rqst[1].rq_nvec = 1;
1621
1622                 rc = SMB2_query_info_init(tcon, server,
1623                                   &rqst[1], COMPOUND_FID,
1624                                   COMPOUND_FID, qi.file_info_class,
1625                                   qi.info_type, qi.additional_information,
1626                                   qi.input_buffer_length,
1627                                   qi.output_buffer_length, buffer);
1628         } else { /* unknown flags */
1629                 cifs_tcon_dbg(VFS, "Invalid passthru query flags: 0x%x\n",
1630                               qi.flags);
1631                 rc = -EINVAL;
1632         }
1633
1634         if (rc)
1635                 goto iqinf_exit;
1636         smb2_set_next_command(tcon, &rqst[1]);
1637         smb2_set_related(&rqst[1]);
1638
1639         /* Close */
1640         rqst[2].rq_iov = &vars->close_iov[0];
1641         rqst[2].rq_nvec = 1;
1642
1643         rc = SMB2_close_init(tcon, server,
1644                              &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
1645         if (rc)
1646                 goto iqinf_exit;
1647         smb2_set_related(&rqst[2]);
1648
1649         rc = compound_send_recv(xid, ses, server,
1650                                 flags, 3, rqst,
1651                                 resp_buftype, rsp_iov);
1652         if (rc)
1653                 goto iqinf_exit;
1654
1655         /* No need to bump num_remote_opens since handle immediately closed */
1656         if (qi.flags & PASSTHRU_FSCTL) {
1657                 pqi = (struct smb_query_info __user *)arg;
1658                 io_rsp = (struct smb2_ioctl_rsp *)rsp_iov[1].iov_base;
1659                 if (le32_to_cpu(io_rsp->OutputCount) < qi.input_buffer_length)
1660                         qi.input_buffer_length = le32_to_cpu(io_rsp->OutputCount);
1661                 if (qi.input_buffer_length > 0 &&
1662                     le32_to_cpu(io_rsp->OutputOffset) + qi.input_buffer_length
1663                     > rsp_iov[1].iov_len)
1664                         goto e_fault;
1665
1666                 if (copy_to_user(&pqi->input_buffer_length,
1667                                  &qi.input_buffer_length,
1668                                  sizeof(qi.input_buffer_length)))
1669                         goto e_fault;
1670
1671                 if (copy_to_user((void __user *)pqi + sizeof(struct smb_query_info),
1672                                  (const void *)io_rsp + le32_to_cpu(io_rsp->OutputOffset),
1673                                  qi.input_buffer_length))
1674                         goto e_fault;
1675         } else {
1676                 pqi = (struct smb_query_info __user *)arg;
1677                 qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base;
1678                 if (le32_to_cpu(qi_rsp->OutputBufferLength) < qi.input_buffer_length)
1679                         qi.input_buffer_length = le32_to_cpu(qi_rsp->OutputBufferLength);
1680                 if (copy_to_user(&pqi->input_buffer_length,
1681                                  &qi.input_buffer_length,
1682                                  sizeof(qi.input_buffer_length)))
1683                         goto e_fault;
1684
1685                 if (copy_to_user(pqi + 1, qi_rsp->Buffer,
1686                                  qi.input_buffer_length))
1687                         goto e_fault;
1688         }
1689
1690  iqinf_exit:
1691         kfree(vars);
1692         kfree(buffer);
1693         SMB2_open_free(&rqst[0]);
1694         if (qi.flags & PASSTHRU_FSCTL)
1695                 SMB2_ioctl_free(&rqst[1]);
1696         else
1697                 SMB2_query_info_free(&rqst[1]);
1698
1699         SMB2_close_free(&rqst[2]);
1700         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
1701         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
1702         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
1703         return rc;
1704
1705 e_fault:
1706         rc = -EFAULT;
1707         goto iqinf_exit;
1708 }
1709
1710 static ssize_t
1711 smb2_copychunk_range(const unsigned int xid,
1712                         struct cifsFileInfo *srcfile,
1713                         struct cifsFileInfo *trgtfile, u64 src_off,
1714                         u64 len, u64 dest_off)
1715 {
1716         int rc;
1717         unsigned int ret_data_len;
1718         struct copychunk_ioctl *pcchunk;
1719         struct copychunk_ioctl_rsp *retbuf = NULL;
1720         struct cifs_tcon *tcon;
1721         int chunks_copied = 0;
1722         bool chunk_sizes_updated = false;
1723         ssize_t bytes_written, total_bytes_written = 0;
1724
1725         pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
1726
1727         if (pcchunk == NULL)
1728                 return -ENOMEM;
1729
1730         cifs_dbg(FYI, "%s: about to call request res key\n", __func__);
1731         /* Request a key from the server to identify the source of the copy */
1732         rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
1733                                 srcfile->fid.persistent_fid,
1734                                 srcfile->fid.volatile_fid, pcchunk);
1735
1736         /* Note: request_res_key sets res_key null only if rc !=0 */
1737         if (rc)
1738                 goto cchunk_out;
1739
1740         /* For now array only one chunk long, will make more flexible later */
1741         pcchunk->ChunkCount = cpu_to_le32(1);
1742         pcchunk->Reserved = 0;
1743         pcchunk->Reserved2 = 0;
1744
1745         tcon = tlink_tcon(trgtfile->tlink);
1746
1747         while (len > 0) {
1748                 pcchunk->SourceOffset = cpu_to_le64(src_off);
1749                 pcchunk->TargetOffset = cpu_to_le64(dest_off);
1750                 pcchunk->Length =
1751                         cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));
1752
1753                 /* Request server copy to target from src identified by key */
1754                 rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1755                         trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
1756                         true /* is_fsctl */, (char *)pcchunk,
1757                         sizeof(struct copychunk_ioctl), CIFSMaxBufSize,
1758                         (char **)&retbuf, &ret_data_len);
1759                 if (rc == 0) {
1760                         if (ret_data_len !=
1761                                         sizeof(struct copychunk_ioctl_rsp)) {
1762                                 cifs_tcon_dbg(VFS, "Invalid cchunk response size\n");
1763                                 rc = -EIO;
1764                                 goto cchunk_out;
1765                         }
1766                         if (retbuf->TotalBytesWritten == 0) {
1767                                 cifs_dbg(FYI, "no bytes copied\n");
1768                                 rc = -EIO;
1769                                 goto cchunk_out;
1770                         }
1771                         /*
1772                          * Check if server claimed to write more than we asked
1773                          */
1774                         if (le32_to_cpu(retbuf->TotalBytesWritten) >
1775                             le32_to_cpu(pcchunk->Length)) {
1776                                 cifs_tcon_dbg(VFS, "Invalid copy chunk response\n");
1777                                 rc = -EIO;
1778                                 goto cchunk_out;
1779                         }
1780                         if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
1781                                 cifs_tcon_dbg(VFS, "Invalid num chunks written\n");
1782                                 rc = -EIO;
1783                                 goto cchunk_out;
1784                         }
1785                         chunks_copied++;
1786
1787                         bytes_written = le32_to_cpu(retbuf->TotalBytesWritten);
1788                         src_off += bytes_written;
1789                         dest_off += bytes_written;
1790                         len -= bytes_written;
1791                         total_bytes_written += bytes_written;
1792
1793                         cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %zu\n",
1794                                 le32_to_cpu(retbuf->ChunksWritten),
1795                                 le32_to_cpu(retbuf->ChunkBytesWritten),
1796                                 bytes_written);
1797                 } else if (rc == -EINVAL) {
1798                         if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
1799                                 goto cchunk_out;
1800
1801                         cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
1802                                 le32_to_cpu(retbuf->ChunksWritten),
1803                                 le32_to_cpu(retbuf->ChunkBytesWritten),
1804                                 le32_to_cpu(retbuf->TotalBytesWritten));
1805
1806                         /*
1807                          * Check if this is the first request using these sizes,
1808                          * (ie check if copy succeed once with original sizes
1809                          * and check if the server gave us different sizes after
1810                          * we already updated max sizes on previous request).
1811                          * if not then why is the server returning an error now
1812                          */
1813                         if ((chunks_copied != 0) || chunk_sizes_updated)
1814                                 goto cchunk_out;
1815
1816                         /* Check that server is not asking us to grow size */
1817                         if (le32_to_cpu(retbuf->ChunkBytesWritten) <
1818                                         tcon->max_bytes_chunk)
1819                                 tcon->max_bytes_chunk =
1820                                         le32_to_cpu(retbuf->ChunkBytesWritten);
1821                         else
1822                                 goto cchunk_out; /* server gave us bogus size */
1823
1824                         /* No need to change MaxChunks since already set to 1 */
1825                         chunk_sizes_updated = true;
1826                 } else
1827                         goto cchunk_out;
1828         }
1829
1830 cchunk_out:
1831         kfree(pcchunk);
1832         kfree(retbuf);
1833         if (rc)
1834                 return rc;
1835         else
1836                 return total_bytes_written;
1837 }
1838
1839 static int
1840 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
1841                 struct cifs_fid *fid)
1842 {
1843         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1844 }
1845
1846 static unsigned int
1847 smb2_read_data_offset(char *buf)
1848 {
1849         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1850
1851         return rsp->DataOffset;
1852 }
1853
1854 static unsigned int
1855 smb2_read_data_length(char *buf, bool in_remaining)
1856 {
1857         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
1858
1859         if (in_remaining)
1860                 return le32_to_cpu(rsp->DataRemaining);
1861
1862         return le32_to_cpu(rsp->DataLength);
1863 }
1864
1865
1866 static int
1867 smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
1868                struct cifs_io_parms *parms, unsigned int *bytes_read,
1869                char **buf, int *buf_type)
1870 {
1871         parms->persistent_fid = pfid->persistent_fid;
1872         parms->volatile_fid = pfid->volatile_fid;
1873         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
1874 }
1875
1876 static int
1877 smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
1878                 struct cifs_io_parms *parms, unsigned int *written,
1879                 struct kvec *iov, unsigned long nr_segs)
1880 {
1881
1882         parms->persistent_fid = pfid->persistent_fid;
1883         parms->volatile_fid = pfid->volatile_fid;
1884         return SMB2_write(xid, parms, written, iov, nr_segs);
1885 }
1886
1887 /* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
1888 static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
1889                 struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
1890 {
1891         struct cifsInodeInfo *cifsi;
1892         int rc;
1893
1894         cifsi = CIFS_I(inode);
1895
1896         /* if file already sparse don't bother setting sparse again */
1897         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
1898                 return true; /* already sparse */
1899
1900         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
1901                 return true; /* already not sparse */
1902
1903         /*
1904          * Can't check for sparse support on share the usual way via the
1905          * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
1906          * since Samba server doesn't set the flag on the share, yet
1907          * supports the set sparse FSCTL and returns sparse correctly
1908          * in the file attributes. If we fail setting sparse though we
1909          * mark that server does not support sparse files for this share
1910          * to avoid repeatedly sending the unsupported fsctl to server
1911          * if the file is repeatedly extended.
1912          */
1913         if (tcon->broken_sparse_sup)
1914                 return false;
1915
1916         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1917                         cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
1918                         true /* is_fctl */,
1919                         &setsparse, 1, CIFSMaxBufSize, NULL, NULL);
1920         if (rc) {
1921                 tcon->broken_sparse_sup = true;
1922                 cifs_dbg(FYI, "set sparse rc = %d\n", rc);
1923                 return false;
1924         }
1925
1926         if (setsparse)
1927                 cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
1928         else
1929                 cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
1930
1931         return true;
1932 }
1933
1934 static int
1935 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
1936                    struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
1937 {
1938         __le64 eof = cpu_to_le64(size);
1939         struct inode *inode;
1940
1941         /*
1942          * If extending file more than one page make sparse. Many Linux fs
1943          * make files sparse by default when extending via ftruncate
1944          */
1945         inode = d_inode(cfile->dentry);
1946
1947         if (!set_alloc && (size > inode->i_size + 8192)) {
1948                 __u8 set_sparse = 1;
1949
1950                 /* whether set sparse succeeds or not, extend the file */
1951                 smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
1952         }
1953
1954         return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
1955                             cfile->fid.volatile_fid, cfile->pid, &eof);
1956 }
1957
1958 static int
1959 smb2_duplicate_extents(const unsigned int xid,
1960                         struct cifsFileInfo *srcfile,
1961                         struct cifsFileInfo *trgtfile, u64 src_off,
1962                         u64 len, u64 dest_off)
1963 {
1964         int rc;
1965         unsigned int ret_data_len;
1966         struct duplicate_extents_to_file dup_ext_buf;
1967         struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
1968
1969         /* server fileays advertise duplicate extent support with this flag */
1970         if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
1971              FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
1972                 return -EOPNOTSUPP;
1973
1974         dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
1975         dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
1976         dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
1977         dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
1978         dup_ext_buf.ByteCount = cpu_to_le64(len);
1979         cifs_dbg(FYI, "Duplicate extents: src off %lld dst off %lld len %lld\n",
1980                 src_off, dest_off, len);
1981
1982         rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
1983         if (rc)
1984                 goto duplicate_extents_out;
1985
1986         rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1987                         trgtfile->fid.volatile_fid,
1988                         FSCTL_DUPLICATE_EXTENTS_TO_FILE,
1989                         true /* is_fsctl */,
1990                         (char *)&dup_ext_buf,
1991                         sizeof(struct duplicate_extents_to_file),
1992                         CIFSMaxBufSize, NULL,
1993                         &ret_data_len);
1994
1995         if (ret_data_len > 0)
1996                 cifs_dbg(FYI, "Non-zero response length in duplicate extents\n");
1997
1998 duplicate_extents_out:
1999         return rc;
2000 }
2001
2002 static int
2003 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2004                    struct cifsFileInfo *cfile)
2005 {
2006         return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
2007                             cfile->fid.volatile_fid);
2008 }
2009
2010 static int
2011 smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
2012                    struct cifsFileInfo *cfile)
2013 {
2014         struct fsctl_set_integrity_information_req integr_info;
2015         unsigned int ret_data_len;
2016
2017         integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
2018         integr_info.Flags = 0;
2019         integr_info.Reserved = 0;
2020
2021         return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
2022                         cfile->fid.volatile_fid,
2023                         FSCTL_SET_INTEGRITY_INFORMATION,
2024                         true /* is_fsctl */,
2025                         (char *)&integr_info,
2026                         sizeof(struct fsctl_set_integrity_information_req),
2027                         CIFSMaxBufSize, NULL,
2028                         &ret_data_len);
2029
2030 }
2031
2032 /* GMT Token is @GMT-YYYY.MM.DD-HH.MM.SS Unicode which is 48 bytes + null */
2033 #define GMT_TOKEN_SIZE 50
2034
2035 #define MIN_SNAPSHOT_ARRAY_SIZE 16 /* See MS-SMB2 section 3.3.5.15.1 */
2036
2037 /*
2038  * Input buffer contains (empty) struct smb_snapshot array with size filled in
2039  * For output see struct SRV_SNAPSHOT_ARRAY in MS-SMB2 section 2.2.32.2
2040  */
2041 static int
2042 smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
2043                    struct cifsFileInfo *cfile, void __user *ioc_buf)
2044 {
2045         char *retbuf = NULL;
2046         unsigned int ret_data_len = 0;
2047         int rc;
2048         u32 max_response_size;
2049         struct smb_snapshot_array snapshot_in;
2050
2051         /*
2052          * On the first query to enumerate the list of snapshots available
2053          * for this volume the buffer begins with 0 (number of snapshots
2054          * which can be returned is zero since at that point we do not know
2055          * how big the buffer needs to be). On the second query,
2056          * it (ret_data_len) is set to number of snapshots so we can
2057          * know to set the maximum response size larger (see below).
2058          */
2059         if (get_user(ret_data_len, (unsigned int __user *)ioc_buf))
2060                 return -EFAULT;
2061
2062         /*
2063          * Note that for snapshot queries that servers like Azure expect that
2064          * the first query be minimal size (and just used to get the number/size
2065          * of previous versions) so response size must be specified as EXACTLY
2066          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2067          * of eight bytes.
2068          */
2069         if (ret_data_len == 0)
2070                 max_response_size = MIN_SNAPSHOT_ARRAY_SIZE;
2071         else
2072                 max_response_size = CIFSMaxBufSize;
2073
2074         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
2075                         cfile->fid.volatile_fid,
2076                         FSCTL_SRV_ENUMERATE_SNAPSHOTS,
2077                         true /* is_fsctl */,
2078                         NULL, 0 /* no input data */, max_response_size,
2079                         (char **)&retbuf,
2080                         &ret_data_len);
2081         cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d\n",
2082                         rc, ret_data_len);
2083         if (rc)
2084                 return rc;
2085
2086         if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) {
2087                 /* Fixup buffer */
2088                 if (copy_from_user(&snapshot_in, ioc_buf,
2089                     sizeof(struct smb_snapshot_array))) {
2090                         rc = -EFAULT;
2091                         kfree(retbuf);
2092                         return rc;
2093                 }
2094
2095                 /*
2096                  * Check for min size, ie not large enough to fit even one GMT
2097                  * token (snapshot).  On the first ioctl some users may pass in
2098                  * smaller size (or zero) to simply get the size of the array
2099                  * so the user space caller can allocate sufficient memory
2100                  * and retry the ioctl again with larger array size sufficient
2101                  * to hold all of the snapshot GMT tokens on the second try.
2102                  */
2103                 if (snapshot_in.snapshot_array_size < GMT_TOKEN_SIZE)
2104                         ret_data_len = sizeof(struct smb_snapshot_array);
2105
2106                 /*
2107                  * We return struct SRV_SNAPSHOT_ARRAY, followed by
2108                  * the snapshot array (of 50 byte GMT tokens) each
2109                  * representing an available previous version of the data
2110                  */
2111                 if (ret_data_len > (snapshot_in.snapshot_array_size +
2112                                         sizeof(struct smb_snapshot_array)))
2113                         ret_data_len = snapshot_in.snapshot_array_size +
2114                                         sizeof(struct smb_snapshot_array);
2115
2116                 if (copy_to_user(ioc_buf, retbuf, ret_data_len))
2117                         rc = -EFAULT;
2118         }
2119
2120         kfree(retbuf);
2121         return rc;
2122 }
2123
2124
2125
2126 static int
2127 smb3_notify(const unsigned int xid, struct file *pfile,
2128             void __user *ioc_buf)
2129 {
2130         struct smb3_notify notify;
2131         struct dentry *dentry = pfile->f_path.dentry;
2132         struct inode *inode = file_inode(pfile);
2133         struct cifs_sb_info *cifs_sb;
2134         struct cifs_open_parms oparms;
2135         struct cifs_fid fid;
2136         struct cifs_tcon *tcon;
2137         unsigned char *path = NULL;
2138         __le16 *utf16_path = NULL;
2139         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2140         int rc = 0;
2141
2142         path = build_path_from_dentry(dentry);
2143         if (path == NULL)
2144                 return -ENOMEM;
2145
2146         cifs_sb = CIFS_SB(inode->i_sb);
2147
2148         utf16_path = cifs_convert_path_to_utf16(path + 1, cifs_sb);
2149         if (utf16_path == NULL) {
2150                 rc = -ENOMEM;
2151                 goto notify_exit;
2152         }
2153
2154         if (copy_from_user(&notify, ioc_buf, sizeof(struct smb3_notify))) {
2155                 rc = -EFAULT;
2156                 goto notify_exit;
2157         }
2158
2159         tcon = cifs_sb_master_tcon(cifs_sb);
2160         oparms.tcon = tcon;
2161         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
2162         oparms.disposition = FILE_OPEN;
2163         oparms.create_options = cifs_create_options(cifs_sb, 0);
2164         oparms.fid = &fid;
2165         oparms.reconnect = false;
2166
2167         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
2168                        NULL);
2169         if (rc)
2170                 goto notify_exit;
2171
2172         rc = SMB2_change_notify(xid, tcon, fid.persistent_fid, fid.volatile_fid,
2173                                 notify.watch_tree, notify.completion_filter);
2174
2175         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2176
2177         cifs_dbg(FYI, "change notify for path %s rc %d\n", path, rc);
2178
2179 notify_exit:
2180         kfree(path);
2181         kfree(utf16_path);
2182         return rc;
2183 }
2184
2185 static int
2186 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
2187                      const char *path, struct cifs_sb_info *cifs_sb,
2188                      struct cifs_fid *fid, __u16 search_flags,
2189                      struct cifs_search_info *srch_inf)
2190 {
2191         __le16 *utf16_path;
2192         struct smb_rqst rqst[2];
2193         struct kvec rsp_iov[2];
2194         int resp_buftype[2];
2195         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2196         struct kvec qd_iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
2197         int rc, flags = 0;
2198         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2199         struct cifs_open_parms oparms;
2200         struct smb2_query_directory_rsp *qd_rsp = NULL;
2201         struct smb2_create_rsp *op_rsp = NULL;
2202         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
2203
2204         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
2205         if (!utf16_path)
2206                 return -ENOMEM;
2207
2208         if (smb3_encryption_required(tcon))
2209                 flags |= CIFS_TRANSFORM_REQ;
2210
2211         memset(rqst, 0, sizeof(rqst));
2212         resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
2213         memset(rsp_iov, 0, sizeof(rsp_iov));
2214
2215         /* Open */
2216         memset(&open_iov, 0, sizeof(open_iov));
2217         rqst[0].rq_iov = open_iov;
2218         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2219
2220         oparms.tcon = tcon;
2221         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
2222         oparms.disposition = FILE_OPEN;
2223         oparms.create_options = cifs_create_options(cifs_sb, 0);
2224         oparms.fid = fid;
2225         oparms.reconnect = false;
2226
2227         rc = SMB2_open_init(tcon, server,
2228                             &rqst[0], &oplock, &oparms, utf16_path);
2229         if (rc)
2230                 goto qdf_free;
2231         smb2_set_next_command(tcon, &rqst[0]);
2232
2233         /* Query directory */
2234         srch_inf->entries_in_buffer = 0;
2235         srch_inf->index_of_last_entry = 2;
2236
2237         memset(&qd_iov, 0, sizeof(qd_iov));
2238         rqst[1].rq_iov = qd_iov;
2239         rqst[1].rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
2240
2241         rc = SMB2_query_directory_init(xid, tcon, server,
2242                                        &rqst[1],
2243                                        COMPOUND_FID, COMPOUND_FID,
2244                                        0, srch_inf->info_level);
2245         if (rc)
2246                 goto qdf_free;
2247
2248         smb2_set_related(&rqst[1]);
2249
2250         rc = compound_send_recv(xid, tcon->ses, server,
2251                                 flags, 2, rqst,
2252                                 resp_buftype, rsp_iov);
2253
2254         /* If the open failed there is nothing to do */
2255         op_rsp = (struct smb2_create_rsp *)rsp_iov[0].iov_base;
2256         if (op_rsp == NULL || op_rsp->sync_hdr.Status != STATUS_SUCCESS) {
2257                 cifs_dbg(FYI, "query_dir_first: open failed rc=%d\n", rc);
2258                 goto qdf_free;
2259         }
2260         fid->persistent_fid = op_rsp->PersistentFileId;
2261         fid->volatile_fid = op_rsp->VolatileFileId;
2262
2263         /* Anything else than ENODATA means a genuine error */
2264         if (rc && rc != -ENODATA) {
2265                 SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
2266                 cifs_dbg(FYI, "query_dir_first: query directory failed rc=%d\n", rc);
2267                 trace_smb3_query_dir_err(xid, fid->persistent_fid,
2268                                          tcon->tid, tcon->ses->Suid, 0, 0, rc);
2269                 goto qdf_free;
2270         }
2271
2272         atomic_inc(&tcon->num_remote_opens);
2273
2274         qd_rsp = (struct smb2_query_directory_rsp *)rsp_iov[1].iov_base;
2275         if (qd_rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
2276                 trace_smb3_query_dir_done(xid, fid->persistent_fid,
2277                                           tcon->tid, tcon->ses->Suid, 0, 0);
2278                 srch_inf->endOfSearch = true;
2279                 rc = 0;
2280                 goto qdf_free;
2281         }
2282
2283         rc = smb2_parse_query_directory(tcon, &rsp_iov[1], resp_buftype[1],
2284                                         srch_inf);
2285         if (rc) {
2286                 trace_smb3_query_dir_err(xid, fid->persistent_fid, tcon->tid,
2287                         tcon->ses->Suid, 0, 0, rc);
2288                 goto qdf_free;
2289         }
2290         resp_buftype[1] = CIFS_NO_BUFFER;
2291
2292         trace_smb3_query_dir_done(xid, fid->persistent_fid, tcon->tid,
2293                         tcon->ses->Suid, 0, srch_inf->entries_in_buffer);
2294
2295  qdf_free:
2296         kfree(utf16_path);
2297         SMB2_open_free(&rqst[0]);
2298         SMB2_query_directory_free(&rqst[1]);
2299         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2300         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2301         return rc;
2302 }
2303
2304 static int
2305 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
2306                     struct cifs_fid *fid, __u16 search_flags,
2307                     struct cifs_search_info *srch_inf)
2308 {
2309         return SMB2_query_directory(xid, tcon, fid->persistent_fid,
2310                                     fid->volatile_fid, 0, srch_inf);
2311 }
2312
2313 static int
2314 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
2315                struct cifs_fid *fid)
2316 {
2317         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
2318 }
2319
2320 /*
2321  * If we negotiate SMB2 protocol and get STATUS_PENDING - update
2322  * the number of credits and return true. Otherwise - return false.
2323  */
2324 static bool
2325 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server)
2326 {
2327         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
2328
2329         if (shdr->Status != STATUS_PENDING)
2330                 return false;
2331
2332         if (shdr->CreditRequest) {
2333                 spin_lock(&server->req_lock);
2334                 server->credits += le16_to_cpu(shdr->CreditRequest);
2335                 spin_unlock(&server->req_lock);
2336                 wake_up(&server->request_q);
2337         }
2338
2339         return true;
2340 }
2341
2342 static bool
2343 smb2_is_session_expired(char *buf)
2344 {
2345         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
2346
2347         if (shdr->Status != STATUS_NETWORK_SESSION_EXPIRED &&
2348             shdr->Status != STATUS_USER_SESSION_DELETED)
2349                 return false;
2350
2351         trace_smb3_ses_expired(shdr->TreeId, shdr->SessionId,
2352                                le16_to_cpu(shdr->Command),
2353                                le64_to_cpu(shdr->MessageId));
2354         cifs_dbg(FYI, "Session expired or deleted\n");
2355
2356         return true;
2357 }
2358
2359 static bool
2360 smb2_is_status_io_timeout(char *buf)
2361 {
2362         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
2363
2364         if (shdr->Status == STATUS_IO_TIMEOUT)
2365                 return true;
2366         else
2367                 return false;
2368 }
2369
2370 static int
2371 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
2372                      struct cifsInodeInfo *cinode)
2373 {
2374         if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
2375                 return SMB2_lease_break(0, tcon, cinode->lease_key,
2376                                         smb2_get_lease_state(cinode));
2377
2378         return SMB2_oplock_break(0, tcon, fid->persistent_fid,
2379                                  fid->volatile_fid,
2380                                  CIFS_CACHE_READ(cinode) ? 1 : 0);
2381 }
2382
2383 void
2384 smb2_set_related(struct smb_rqst *rqst)
2385 {
2386         struct smb2_sync_hdr *shdr;
2387
2388         shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
2389         if (shdr == NULL) {
2390                 cifs_dbg(FYI, "shdr NULL in smb2_set_related\n");
2391                 return;
2392         }
2393         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2394 }
2395
2396 char smb2_padding[7] = {0, 0, 0, 0, 0, 0, 0};
2397
2398 void
2399 smb2_set_next_command(struct cifs_tcon *tcon, struct smb_rqst *rqst)
2400 {
2401         struct smb2_sync_hdr *shdr;
2402         struct cifs_ses *ses = tcon->ses;
2403         struct TCP_Server_Info *server = ses->server;
2404         unsigned long len = smb_rqst_len(server, rqst);
2405         int i, num_padding;
2406
2407         shdr = (struct smb2_sync_hdr *)(rqst->rq_iov[0].iov_base);
2408         if (shdr == NULL) {
2409                 cifs_dbg(FYI, "shdr NULL in smb2_set_next_command\n");
2410                 return;
2411         }
2412
2413         /* SMB headers in a compound are 8 byte aligned. */
2414
2415         /* No padding needed */
2416         if (!(len & 7))
2417                 goto finished;
2418
2419         num_padding = 8 - (len & 7);
2420         if (!smb3_encryption_required(tcon)) {
2421                 /*
2422                  * If we do not have encryption then we can just add an extra
2423                  * iov for the padding.
2424                  */
2425                 rqst->rq_iov[rqst->rq_nvec].iov_base = smb2_padding;
2426                 rqst->rq_iov[rqst->rq_nvec].iov_len = num_padding;
2427                 rqst->rq_nvec++;
2428                 len += num_padding;
2429         } else {
2430                 /*
2431                  * We can not add a small padding iov for the encryption case
2432                  * because the encryption framework can not handle the padding
2433                  * iovs.
2434                  * We have to flatten this into a single buffer and add
2435                  * the padding to it.
2436                  */
2437                 for (i = 1; i < rqst->rq_nvec; i++) {
2438                         memcpy(rqst->rq_iov[0].iov_base +
2439                                rqst->rq_iov[0].iov_len,
2440                                rqst->rq_iov[i].iov_base,
2441                                rqst->rq_iov[i].iov_len);
2442                         rqst->rq_iov[0].iov_len += rqst->rq_iov[i].iov_len;
2443                 }
2444                 memset(rqst->rq_iov[0].iov_base + rqst->rq_iov[0].iov_len,
2445                        0, num_padding);
2446                 rqst->rq_iov[0].iov_len += num_padding;
2447                 len += num_padding;
2448                 rqst->rq_nvec = 1;
2449         }
2450
2451  finished:
2452         shdr->NextCommand = cpu_to_le32(len);
2453 }
2454
2455 /*
2456  * Passes the query info response back to the caller on success.
2457  * Caller need to free this with free_rsp_buf().
2458  */
2459 int
2460 smb2_query_info_compound(const unsigned int xid, struct cifs_tcon *tcon,
2461                          __le16 *utf16_path, u32 desired_access,
2462                          u32 class, u32 type, u32 output_len,
2463                          struct kvec *rsp, int *buftype,
2464                          struct cifs_sb_info *cifs_sb)
2465 {
2466         struct cifs_ses *ses = tcon->ses;
2467         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2468         int flags = 0;
2469         struct smb_rqst rqst[3];
2470         int resp_buftype[3];
2471         struct kvec rsp_iov[3];
2472         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2473         struct kvec qi_iov[1];
2474         struct kvec close_iov[1];
2475         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2476         struct cifs_open_parms oparms;
2477         struct cifs_fid fid;
2478         int rc;
2479
2480         if (smb3_encryption_required(tcon))
2481                 flags |= CIFS_TRANSFORM_REQ;
2482
2483         memset(rqst, 0, sizeof(rqst));
2484         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
2485         memset(rsp_iov, 0, sizeof(rsp_iov));
2486
2487         memset(&open_iov, 0, sizeof(open_iov));
2488         rqst[0].rq_iov = open_iov;
2489         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2490
2491         oparms.tcon = tcon;
2492         oparms.desired_access = desired_access;
2493         oparms.disposition = FILE_OPEN;
2494         oparms.create_options = cifs_create_options(cifs_sb, 0);
2495         oparms.fid = &fid;
2496         oparms.reconnect = false;
2497
2498         rc = SMB2_open_init(tcon, server,
2499                             &rqst[0], &oplock, &oparms, utf16_path);
2500         if (rc)
2501                 goto qic_exit;
2502         smb2_set_next_command(tcon, &rqst[0]);
2503
2504         memset(&qi_iov, 0, sizeof(qi_iov));
2505         rqst[1].rq_iov = qi_iov;
2506         rqst[1].rq_nvec = 1;
2507
2508         rc = SMB2_query_info_init(tcon, server,
2509                                   &rqst[1], COMPOUND_FID, COMPOUND_FID,
2510                                   class, type, 0,
2511                                   output_len, 0,
2512                                   NULL);
2513         if (rc)
2514                 goto qic_exit;
2515         smb2_set_next_command(tcon, &rqst[1]);
2516         smb2_set_related(&rqst[1]);
2517
2518         memset(&close_iov, 0, sizeof(close_iov));
2519         rqst[2].rq_iov = close_iov;
2520         rqst[2].rq_nvec = 1;
2521
2522         rc = SMB2_close_init(tcon, server,
2523                              &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
2524         if (rc)
2525                 goto qic_exit;
2526         smb2_set_related(&rqst[2]);
2527
2528         rc = compound_send_recv(xid, ses, server,
2529                                 flags, 3, rqst,
2530                                 resp_buftype, rsp_iov);
2531         if (rc) {
2532                 free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
2533                 if (rc == -EREMCHG) {
2534                         tcon->need_reconnect = true;
2535                         pr_warn_once("server share %s deleted\n",
2536                                      tcon->treeName);
2537                 }
2538                 goto qic_exit;
2539         }
2540         *rsp = rsp_iov[1];
2541         *buftype = resp_buftype[1];
2542
2543  qic_exit:
2544         SMB2_open_free(&rqst[0]);
2545         SMB2_query_info_free(&rqst[1]);
2546         SMB2_close_free(&rqst[2]);
2547         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
2548         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
2549         return rc;
2550 }
2551
2552 static int
2553 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2554              struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
2555 {
2556         struct smb2_query_info_rsp *rsp;
2557         struct smb2_fs_full_size_info *info = NULL;
2558         __le16 utf16_path = 0; /* Null - open root of share */
2559         struct kvec rsp_iov = {NULL, 0};
2560         int buftype = CIFS_NO_BUFFER;
2561         int rc;
2562
2563
2564         rc = smb2_query_info_compound(xid, tcon, &utf16_path,
2565                                       FILE_READ_ATTRIBUTES,
2566                                       FS_FULL_SIZE_INFORMATION,
2567                                       SMB2_O_INFO_FILESYSTEM,
2568                                       sizeof(struct smb2_fs_full_size_info),
2569                                       &rsp_iov, &buftype, cifs_sb);
2570         if (rc)
2571                 goto qfs_exit;
2572
2573         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2574         buf->f_type = SMB2_MAGIC_NUMBER;
2575         info = (struct smb2_fs_full_size_info *)(
2576                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
2577         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
2578                                le32_to_cpu(rsp->OutputBufferLength),
2579                                &rsp_iov,
2580                                sizeof(struct smb2_fs_full_size_info));
2581         if (!rc)
2582                 smb2_copy_fs_info_to_kstatfs(info, buf);
2583
2584 qfs_exit:
2585         free_rsp_buf(buftype, rsp_iov.iov_base);
2586         return rc;
2587 }
2588
2589 static int
2590 smb311_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
2591                struct cifs_sb_info *cifs_sb, struct kstatfs *buf)
2592 {
2593         int rc;
2594         __le16 srch_path = 0; /* Null - open root of share */
2595         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2596         struct cifs_open_parms oparms;
2597         struct cifs_fid fid;
2598
2599         if (!tcon->posix_extensions)
2600                 return smb2_queryfs(xid, tcon, cifs_sb, buf);
2601
2602         oparms.tcon = tcon;
2603         oparms.desired_access = FILE_READ_ATTRIBUTES;
2604         oparms.disposition = FILE_OPEN;
2605         oparms.create_options = cifs_create_options(cifs_sb, 0);
2606         oparms.fid = &fid;
2607         oparms.reconnect = false;
2608
2609         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL,
2610                        NULL, NULL);
2611         if (rc)
2612                 return rc;
2613
2614         rc = SMB311_posix_qfs_info(xid, tcon, fid.persistent_fid,
2615                                    fid.volatile_fid, buf);
2616         buf->f_type = SMB2_MAGIC_NUMBER;
2617         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
2618         return rc;
2619 }
2620
2621 static bool
2622 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
2623 {
2624         return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
2625                ob1->fid.volatile_fid == ob2->fid.volatile_fid;
2626 }
2627
2628 static int
2629 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
2630                __u64 length, __u32 type, int lock, int unlock, bool wait)
2631 {
2632         if (unlock && !lock)
2633                 type = SMB2_LOCKFLAG_UNLOCK;
2634         return SMB2_lock(xid, tlink_tcon(cfile->tlink),
2635                          cfile->fid.persistent_fid, cfile->fid.volatile_fid,
2636                          current->tgid, length, offset, type, wait);
2637 }
2638
2639 static void
2640 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
2641 {
2642         memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
2643 }
2644
2645 static void
2646 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
2647 {
2648         memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
2649 }
2650
2651 static void
2652 smb2_new_lease_key(struct cifs_fid *fid)
2653 {
2654         generate_random_uuid(fid->lease_key);
2655 }
2656
2657 static int
2658 smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
2659                    const char *search_name,
2660                    struct dfs_info3_param **target_nodes,
2661                    unsigned int *num_of_nodes,
2662                    const struct nls_table *nls_codepage, int remap)
2663 {
2664         int rc;
2665         __le16 *utf16_path = NULL;
2666         int utf16_path_len = 0;
2667         struct cifs_tcon *tcon;
2668         struct fsctl_get_dfs_referral_req *dfs_req = NULL;
2669         struct get_dfs_referral_rsp *dfs_rsp = NULL;
2670         u32 dfs_req_size = 0, dfs_rsp_size = 0;
2671
2672         cifs_dbg(FYI, "%s: path: %s\n", __func__, search_name);
2673
2674         /*
2675          * Try to use the IPC tcon, otherwise just use any
2676          */
2677         tcon = ses->tcon_ipc;
2678         if (tcon == NULL) {
2679                 spin_lock(&cifs_tcp_ses_lock);
2680                 tcon = list_first_entry_or_null(&ses->tcon_list,
2681                                                 struct cifs_tcon,
2682                                                 tcon_list);
2683                 if (tcon)
2684                         tcon->tc_count++;
2685                 spin_unlock(&cifs_tcp_ses_lock);
2686         }
2687
2688         if (tcon == NULL) {
2689                 cifs_dbg(VFS, "session %p has no tcon available for a dfs referral request\n",
2690                          ses);
2691                 rc = -ENOTCONN;
2692                 goto out;
2693         }
2694
2695         utf16_path = cifs_strndup_to_utf16(search_name, PATH_MAX,
2696                                            &utf16_path_len,
2697                                            nls_codepage, remap);
2698         if (!utf16_path) {
2699                 rc = -ENOMEM;
2700                 goto out;
2701         }
2702
2703         dfs_req_size = sizeof(*dfs_req) + utf16_path_len;
2704         dfs_req = kzalloc(dfs_req_size, GFP_KERNEL);
2705         if (!dfs_req) {
2706                 rc = -ENOMEM;
2707                 goto out;
2708         }
2709
2710         /* Highest DFS referral version understood */
2711         dfs_req->MaxReferralLevel = DFS_VERSION;
2712
2713         /* Path to resolve in an UTF-16 null-terminated string */
2714         memcpy(dfs_req->RequestFileName, utf16_path, utf16_path_len);
2715
2716         do {
2717                 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
2718                                 FSCTL_DFS_GET_REFERRALS,
2719                                 true /* is_fsctl */,
2720                                 (char *)dfs_req, dfs_req_size, CIFSMaxBufSize,
2721                                 (char **)&dfs_rsp, &dfs_rsp_size);
2722         } while (rc == -EAGAIN);
2723
2724         if (rc) {
2725                 if ((rc != -ENOENT) && (rc != -EOPNOTSUPP))
2726                         cifs_tcon_dbg(VFS, "ioctl error in %s rc=%d\n", __func__, rc);
2727                 goto out;
2728         }
2729
2730         rc = parse_dfs_referrals(dfs_rsp, dfs_rsp_size,
2731                                  num_of_nodes, target_nodes,
2732                                  nls_codepage, remap, search_name,
2733                                  true /* is_unicode */);
2734         if (rc) {
2735                 cifs_tcon_dbg(VFS, "parse error in %s rc=%d\n", __func__, rc);
2736                 goto out;
2737         }
2738
2739  out:
2740         if (tcon && !tcon->ipc) {
2741                 /* ipc tcons are not refcounted */
2742                 spin_lock(&cifs_tcp_ses_lock);
2743                 tcon->tc_count--;
2744                 spin_unlock(&cifs_tcp_ses_lock);
2745         }
2746         kfree(utf16_path);
2747         kfree(dfs_req);
2748         kfree(dfs_rsp);
2749         return rc;
2750 }
2751
2752 static int
2753 parse_reparse_posix(struct reparse_posix_data *symlink_buf,
2754                       u32 plen, char **target_path,
2755                       struct cifs_sb_info *cifs_sb)
2756 {
2757         unsigned int len;
2758
2759         /* See MS-FSCC 2.1.2.6 for the 'NFS' style reparse tags */
2760         len = le16_to_cpu(symlink_buf->ReparseDataLength);
2761
2762         if (le64_to_cpu(symlink_buf->InodeType) != NFS_SPECFILE_LNK) {
2763                 cifs_dbg(VFS, "%lld not a supported symlink type\n",
2764                         le64_to_cpu(symlink_buf->InodeType));
2765                 return -EOPNOTSUPP;
2766         }
2767
2768         *target_path = cifs_strndup_from_utf16(
2769                                 symlink_buf->PathBuffer,
2770                                 len, true, cifs_sb->local_nls);
2771         if (!(*target_path))
2772                 return -ENOMEM;
2773
2774         convert_delimiter(*target_path, '/');
2775         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2776
2777         return 0;
2778 }
2779
2780 static int
2781 parse_reparse_symlink(struct reparse_symlink_data_buffer *symlink_buf,
2782                       u32 plen, char **target_path,
2783                       struct cifs_sb_info *cifs_sb)
2784 {
2785         unsigned int sub_len;
2786         unsigned int sub_offset;
2787
2788         /* We handle Symbolic Link reparse tag here. See: MS-FSCC 2.1.2.4 */
2789
2790         sub_offset = le16_to_cpu(symlink_buf->SubstituteNameOffset);
2791         sub_len = le16_to_cpu(symlink_buf->SubstituteNameLength);
2792         if (sub_offset + 20 > plen ||
2793             sub_offset + sub_len + 20 > plen) {
2794                 cifs_dbg(VFS, "srv returned malformed symlink buffer\n");
2795                 return -EIO;
2796         }
2797
2798         *target_path = cifs_strndup_from_utf16(
2799                                 symlink_buf->PathBuffer + sub_offset,
2800                                 sub_len, true, cifs_sb->local_nls);
2801         if (!(*target_path))
2802                 return -ENOMEM;
2803
2804         convert_delimiter(*target_path, '/');
2805         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
2806
2807         return 0;
2808 }
2809
2810 static int
2811 parse_reparse_point(struct reparse_data_buffer *buf,
2812                     u32 plen, char **target_path,
2813                     struct cifs_sb_info *cifs_sb)
2814 {
2815         if (plen < sizeof(struct reparse_data_buffer)) {
2816                 cifs_dbg(VFS, "reparse buffer is too small. Must be at least 8 bytes but was %d\n",
2817                          plen);
2818                 return -EIO;
2819         }
2820
2821         if (plen < le16_to_cpu(buf->ReparseDataLength) +
2822             sizeof(struct reparse_data_buffer)) {
2823                 cifs_dbg(VFS, "srv returned invalid reparse buf length: %d\n",
2824                          plen);
2825                 return -EIO;
2826         }
2827
2828         /* See MS-FSCC 2.1.2 */
2829         switch (le32_to_cpu(buf->ReparseTag)) {
2830         case IO_REPARSE_TAG_NFS:
2831                 return parse_reparse_posix(
2832                         (struct reparse_posix_data *)buf,
2833                         plen, target_path, cifs_sb);
2834         case IO_REPARSE_TAG_SYMLINK:
2835                 return parse_reparse_symlink(
2836                         (struct reparse_symlink_data_buffer *)buf,
2837                         plen, target_path, cifs_sb);
2838         default:
2839                 cifs_dbg(VFS, "srv returned unknown symlink buffer tag:0x%08x\n",
2840                          le32_to_cpu(buf->ReparseTag));
2841                 return -EOPNOTSUPP;
2842         }
2843 }
2844
2845 #define SMB2_SYMLINK_STRUCT_SIZE \
2846         (sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
2847
2848 static int
2849 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
2850                    struct cifs_sb_info *cifs_sb, const char *full_path,
2851                    char **target_path, bool is_reparse_point)
2852 {
2853         int rc;
2854         __le16 *utf16_path = NULL;
2855         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
2856         struct cifs_open_parms oparms;
2857         struct cifs_fid fid;
2858         struct kvec err_iov = {NULL, 0};
2859         struct smb2_err_rsp *err_buf = NULL;
2860         struct smb2_symlink_err_rsp *symlink;
2861         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
2862         unsigned int sub_len;
2863         unsigned int sub_offset;
2864         unsigned int print_len;
2865         unsigned int print_offset;
2866         int flags = 0;
2867         struct smb_rqst rqst[3];
2868         int resp_buftype[3];
2869         struct kvec rsp_iov[3];
2870         struct kvec open_iov[SMB2_CREATE_IOV_SIZE];
2871         struct kvec io_iov[SMB2_IOCTL_IOV_SIZE];
2872         struct kvec close_iov[1];
2873         struct smb2_create_rsp *create_rsp;
2874         struct smb2_ioctl_rsp *ioctl_rsp;
2875         struct reparse_data_buffer *reparse_buf;
2876         int create_options = is_reparse_point ? OPEN_REPARSE_POINT : 0;
2877         u32 plen;
2878
2879         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
2880
2881         *target_path = NULL;
2882
2883         if (smb3_encryption_required(tcon))
2884                 flags |= CIFS_TRANSFORM_REQ;
2885
2886         memset(rqst, 0, sizeof(rqst));
2887         resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER;
2888         memset(rsp_iov, 0, sizeof(rsp_iov));
2889
2890         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2891         if (!utf16_path)
2892                 return -ENOMEM;
2893
2894         /* Open */
2895         memset(&open_iov, 0, sizeof(open_iov));
2896         rqst[0].rq_iov = open_iov;
2897         rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE;
2898
2899         memset(&oparms, 0, sizeof(oparms));
2900         oparms.tcon = tcon;
2901         oparms.desired_access = FILE_READ_ATTRIBUTES;
2902         oparms.disposition = FILE_OPEN;
2903         oparms.create_options = cifs_create_options(cifs_sb, create_options);
2904         oparms.fid = &fid;
2905         oparms.reconnect = false;
2906
2907         rc = SMB2_open_init(tcon, server,
2908                             &rqst[0], &oplock, &oparms, utf16_path);
2909         if (rc)
2910                 goto querty_exit;
2911         smb2_set_next_command(tcon, &rqst[0]);
2912
2913
2914         /* IOCTL */
2915         memset(&io_iov, 0, sizeof(io_iov));
2916         rqst[1].rq_iov = io_iov;
2917         rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE;
2918
2919         rc = SMB2_ioctl_init(tcon, server,
2920                              &rqst[1], fid.persistent_fid,
2921                              fid.volatile_fid, FSCTL_GET_REPARSE_POINT,
2922                              true /* is_fctl */, NULL, 0,
2923                              CIFSMaxBufSize -
2924                              MAX_SMB2_CREATE_RESPONSE_SIZE -
2925                              MAX_SMB2_CLOSE_RESPONSE_SIZE);
2926         if (rc)
2927                 goto querty_exit;
2928
2929         smb2_set_next_command(tcon, &rqst[1]);
2930         smb2_set_related(&rqst[1]);
2931
2932
2933         /* Close */
2934         memset(&close_iov, 0, sizeof(close_iov));
2935         rqst[2].rq_iov = close_iov;
2936         rqst[2].rq_nvec = 1;
2937
2938         rc = SMB2_close_init(tcon, server,
2939                              &rqst[2], COMPOUND_FID, COMPOUND_FID, false);
2940         if (rc)
2941                 goto querty_exit;
2942
2943         smb2_set_related(&rqst[2]);
2944
2945         rc = compound_send_recv(xid, tcon->ses, server,
2946                                 flags, 3, rqst,
2947                                 resp_buftype, rsp_iov);
2948
2949         create_rsp = rsp_iov[0].iov_base;
2950         if (create_rsp && create_rsp->sync_hdr.Status)
2951                 err_iov = rsp_iov[0];
2952         ioctl_rsp = rsp_iov[1].iov_base;
2953
2954         /*
2955          * Open was successful and we got an ioctl response.
2956          */
2957         if ((rc == 0) && (is_reparse_point)) {
2958                 /* See MS-FSCC 2.3.23 */
2959
2960                 reparse_buf = (struct reparse_data_buffer *)
2961                         ((char *)ioctl_rsp +
2962                          le32_to_cpu(ioctl_rsp->OutputOffset));
2963                 plen = le32_to_cpu(ioctl_rsp->OutputCount);
2964
2965                 if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) >
2966                     rsp_iov[1].iov_len) {
2967                         cifs_tcon_dbg(VFS, "srv returned invalid ioctl len: %d\n",
2968                                  plen);
2969                         rc = -EIO;
2970                         goto querty_exit;
2971                 }
2972
2973                 rc = parse_reparse_point(reparse_buf, plen, target_path,
2974                                          cifs_sb);
2975                 goto querty_exit;
2976         }
2977
2978         if (!rc || !err_iov.iov_base) {
2979                 rc = -ENOENT;
2980                 goto querty_exit;
2981         }
2982
2983         err_buf = err_iov.iov_base;
2984         if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
2985             err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE) {
2986                 rc = -EINVAL;
2987                 goto querty_exit;
2988         }
2989
2990         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
2991         if (le32_to_cpu(symlink->SymLinkErrorTag) != SYMLINK_ERROR_TAG ||
2992             le32_to_cpu(symlink->ReparseTag) != IO_REPARSE_TAG_SYMLINK) {
2993                 rc = -EINVAL;
2994                 goto querty_exit;
2995         }
2996
2997         /* open must fail on symlink - reset rc */
2998         rc = 0;
2999         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
3000         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
3001         print_len = le16_to_cpu(symlink->PrintNameLength);
3002         print_offset = le16_to_cpu(symlink->PrintNameOffset);
3003
3004         if (err_iov.iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
3005                 rc = -EINVAL;
3006                 goto querty_exit;
3007         }
3008
3009         if (err_iov.iov_len <
3010             SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
3011                 rc = -EINVAL;
3012                 goto querty_exit;
3013         }
3014
3015         *target_path = cifs_strndup_from_utf16(
3016                                 (char *)symlink->PathBuffer + sub_offset,
3017                                 sub_len, true, cifs_sb->local_nls);
3018         if (!(*target_path)) {
3019                 rc = -ENOMEM;
3020                 goto querty_exit;
3021         }
3022         convert_delimiter(*target_path, '/');
3023         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
3024
3025  querty_exit:
3026         cifs_dbg(FYI, "query symlink rc %d\n", rc);
3027         kfree(utf16_path);
3028         SMB2_open_free(&rqst[0]);
3029         SMB2_ioctl_free(&rqst[1]);
3030         SMB2_close_free(&rqst[2]);
3031         free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base);
3032         free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base);
3033         free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base);
3034         return rc;
3035 }
3036
3037 static struct cifs_ntsd *
3038 get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
3039                 const struct cifs_fid *cifsfid, u32 *pacllen)
3040 {
3041         struct cifs_ntsd *pntsd = NULL;
3042         unsigned int xid;
3043         int rc = -EOPNOTSUPP;
3044         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
3045
3046         if (IS_ERR(tlink))
3047                 return ERR_CAST(tlink);
3048
3049         xid = get_xid();
3050         cifs_dbg(FYI, "trying to get acl\n");
3051
3052         rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
3053                             cifsfid->volatile_fid, (void **)&pntsd, pacllen);
3054         free_xid(xid);
3055
3056         cifs_put_tlink(tlink);
3057
3058         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
3059         if (rc)
3060                 return ERR_PTR(rc);
3061         return pntsd;
3062
3063 }
3064
3065 static struct cifs_ntsd *
3066 get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
3067                 const char *path, u32 *pacllen)
3068 {
3069         struct cifs_ntsd *pntsd = NULL;
3070         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
3071         unsigned int xid;
3072         int rc;
3073         struct cifs_tcon *tcon;
3074         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
3075         struct cifs_fid fid;
3076         struct cifs_open_parms oparms;
3077         __le16 *utf16_path;
3078
3079         cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
3080         if (IS_ERR(tlink))
3081                 return ERR_CAST(tlink);
3082
3083         tcon = tlink_tcon(tlink);
3084         xid = get_xid();
3085
3086         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
3087         if (!utf16_path) {
3088                 rc = -ENOMEM;
3089                 free_xid(xid);
3090                 return ERR_PTR(rc);
3091         }
3092
3093         oparms.tcon = tcon;
3094         oparms.desired_access = READ_CONTROL;
3095         oparms.disposition = FILE_OPEN;
3096         /*
3097          * When querying an ACL, even if the file is a symlink we want to open
3098          * the source not the target, and so the protocol requires that the
3099          * client specify this flag when opening a reparse point
3100          */
3101         oparms.create_options = cifs_create_options(cifs_sb, 0) | OPEN_REPARSE_POINT;
3102         oparms.fid = &fid;
3103         oparms.reconnect = false;
3104
3105         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL, NULL,
3106                        NULL);
3107         kfree(utf16_path);
3108         if (!rc) {
3109                 rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
3110                             fid.volatile_fid, (void **)&pntsd, pacllen);
3111                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
3112         }
3113
3114         cifs_put_tlink(tlink);
3115         free_xid(xid);
3116
3117         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
3118         if (rc)
3119                 return ERR_PTR(rc);
3120         return pntsd;
3121 }
3122
3123 static int
3124 set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
3125                 struct inode *inode, const char *path, int aclflag)
3126 {
3127         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
3128         unsigned int xid;
3129         int rc, access_flags = 0;
3130         struct cifs_tcon *tcon;
3131         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
3132         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
3133         struct cifs_fid fid;
3134         struct cifs_open_parms oparms;
3135         __le16 *utf16_path;
3136
3137         cifs_dbg(FYI, "set smb3 acl for path %s\n", path);
3138         if (IS_ERR(tlink))
3139                 return PTR_ERR(tlink);
3140
3141         tcon = tlink_tcon(tlink);
3142         xid = get_xid();
3143
3144         if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP)
3145                 access_flags = WRITE_OWNER;
3146         else
3147                 access_flags = WRITE_DAC;
3148
3149         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
3150         if (!utf16_path) {
3151                 rc = -ENOMEM;
3152                 free_xid(xid);
3153                 return rc;
3154         }
3155
3156         oparms.tcon = tcon;
3157         oparms.desired_access = access_flags;
3158         oparms.create_options = cifs_create_options(cifs_sb, 0);
3159         oparms.disposition = FILE_OPEN;
3160         oparms.path = path;
3161         oparms.fid = &fid;
3162         oparms.reconnect = false;
3163
3164         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
3165                        NULL, NULL);
3166         kfree(utf16_path);
3167         if (!rc) {
3168                 rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
3169                             fid.volatile_fid, pnntsd, acllen, aclflag);
3170                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
3171         }
3172
3173         cifs_put_tlink(tlink);
3174         free_xid(xid);
3175         return rc;
3176 }
3177
3178 /* Retrieve an ACL from the server */
3179 static struct cifs_ntsd *
3180 get_smb2_acl(struct cifs_sb_info *cifs_sb,
3181                                       struct inode *inode, const char *path,
3182                                       u32 *pacllen)
3183 {
3184         struct cifs_ntsd *pntsd = NULL;
3185         struct cifsFileInfo *open_file = NULL;
3186
3187         if (inode)
3188                 open_file = find_readable_file(CIFS_I(inode), true);
3189         if (!open_file)
3190                 return get_smb2_acl_by_path(cifs_sb, path, pacllen);
3191
3192         pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen);
3193         cifsFileInfo_put(open_file);
3194         return pntsd;
3195 }
3196
3197 static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
3198                             loff_t offset, loff_t len, bool keep_size)
3199 {
3200         struct cifs_ses *ses = tcon->ses;
3201         struct inode *inode;
3202         struct cifsInodeInfo *cifsi;
3203         struct cifsFileInfo *cfile = file->private_data;
3204         struct file_zero_data_information fsctl_buf;
3205         long rc;
3206         unsigned int xid;
3207         __le64 eof;
3208
3209         xid = get_xid();
3210
3211         inode = d_inode(cfile->dentry);
3212         cifsi = CIFS_I(inode);
3213
3214         trace_smb3_zero_enter(xid, cfile->fid.persistent_fid, tcon->tid,
3215                               ses->Suid, offset, len);
3216
3217         /*
3218          * We zero the range through ioctl, so we need remove the page caches
3219          * first, otherwise the data may be inconsistent with the server.
3220          */
3221         truncate_pagecache_range(inode, offset, offset + len - 1);
3222
3223         /* if file not oplocked can't be sure whether asking to extend size */
3224         if (!CIFS_CACHE_READ(cifsi))
3225                 if (keep_size == false) {
3226                         rc = -EOPNOTSUPP;
3227                         trace_smb3_zero_err(xid, cfile->fid.persistent_fid,
3228                                 tcon->tid, ses->Suid, offset, len, rc);
3229                         free_xid(xid);
3230                         return rc;
3231                 }
3232
3233         cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
3234
3235         fsctl_buf.FileOffset = cpu_to_le64(offset);
3236         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
3237
3238         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3239                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA, true,
3240                         (char *)&fsctl_buf,
3241                         sizeof(struct file_zero_data_information),
3242                         0, NULL, NULL);
3243         if (rc)
3244                 goto zero_range_exit;
3245
3246         /*
3247          * do we also need to change the size of the file?
3248          */
3249         if (keep_size == false && i_size_read(inode) < offset + len) {
3250                 eof = cpu_to_le64(offset + len);
3251                 rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
3252                                   cfile->fid.volatile_fid, cfile->pid, &eof);
3253         }
3254
3255  zero_range_exit:
3256         free_xid(xid);
3257         if (rc)
3258                 trace_smb3_zero_err(xid, cfile->fid.persistent_fid, tcon->tid,
3259                               ses->Suid, offset, len, rc);
3260         else
3261                 trace_smb3_zero_done(xid, cfile->fid.persistent_fid, tcon->tid,
3262                               ses->Suid, offset, len);
3263         return rc;
3264 }
3265
3266 static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
3267                             loff_t offset, loff_t len)
3268 {
3269         struct inode *inode;
3270         struct cifsFileInfo *cfile = file->private_data;
3271         struct file_zero_data_information fsctl_buf;
3272         long rc;
3273         unsigned int xid;
3274         __u8 set_sparse = 1;
3275
3276         xid = get_xid();
3277
3278         inode = d_inode(cfile->dentry);
3279
3280         /* Need to make file sparse, if not already, before freeing range. */
3281         /* Consider adding equivalent for compressed since it could also work */
3282         if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse)) {
3283                 rc = -EOPNOTSUPP;
3284                 free_xid(xid);
3285                 return rc;
3286         }
3287
3288         /*
3289          * We implement the punch hole through ioctl, so we need remove the page
3290          * caches first, otherwise the data may be inconsistent with the server.
3291          */
3292         truncate_pagecache_range(inode, offset, offset + len - 1);
3293
3294         cifs_dbg(FYI, "Offset %lld len %lld\n", offset, len);
3295
3296         fsctl_buf.FileOffset = cpu_to_le64(offset);
3297         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
3298
3299         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3300                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
3301                         true /* is_fctl */, (char *)&fsctl_buf,
3302                         sizeof(struct file_zero_data_information),
3303                         CIFSMaxBufSize, NULL, NULL);
3304         free_xid(xid);
3305         return rc;
3306 }
3307
3308 static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
3309                             loff_t off, loff_t len, bool keep_size)
3310 {
3311         struct inode *inode;
3312         struct cifsInodeInfo *cifsi;
3313         struct cifsFileInfo *cfile = file->private_data;
3314         long rc = -EOPNOTSUPP;
3315         unsigned int xid;
3316         __le64 eof;
3317
3318         xid = get_xid();
3319
3320         inode = d_inode(cfile->dentry);
3321         cifsi = CIFS_I(inode);
3322
3323         trace_smb3_falloc_enter(xid, cfile->fid.persistent_fid, tcon->tid,
3324                                 tcon->ses->Suid, off, len);
3325         /* if file not oplocked can't be sure whether asking to extend size */
3326         if (!CIFS_CACHE_READ(cifsi))
3327                 if (keep_size == false) {
3328                         trace_smb3_falloc_err(xid, cfile->fid.persistent_fid,
3329                                 tcon->tid, tcon->ses->Suid, off, len, rc);
3330                         free_xid(xid);
3331                         return rc;
3332                 }
3333
3334         /*
3335          * Extending the file
3336          */
3337         if ((keep_size == false) && i_size_read(inode) < off + len) {
3338                 rc = inode_newsize_ok(inode, off + len);
3339                 if (rc)
3340                         goto out;
3341
3342                 if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0)
3343                         smb2_set_sparse(xid, tcon, cfile, inode, false);
3344
3345                 eof = cpu_to_le64(off + len);
3346                 rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
3347                                   cfile->fid.volatile_fid, cfile->pid, &eof);
3348                 if (rc == 0) {
3349                         cifsi->server_eof = off + len;
3350                         cifs_setsize(inode, off + len);
3351                         cifs_truncate_page(inode->i_mapping, inode->i_size);
3352                         truncate_setsize(inode, off + len);
3353                 }
3354                 goto out;
3355         }
3356
3357         /*
3358          * Files are non-sparse by default so falloc may be a no-op
3359          * Must check if file sparse. If not sparse, and since we are not
3360          * extending then no need to do anything since file already allocated
3361          */
3362         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
3363                 rc = 0;
3364                 goto out;
3365         }
3366
3367         if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
3368                 /*
3369                  * Check if falloc starts within first few pages of file
3370                  * and ends within a few pages of the end of file to
3371                  * ensure that most of file is being forced to be
3372                  * fallocated now. If so then setting whole file sparse
3373                  * ie potentially making a few extra pages at the beginning
3374                  * or end of the file non-sparse via set_sparse is harmless.
3375                  */
3376                 if ((off > 8192) || (off + len + 8192 < i_size_read(inode))) {
3377                         rc = -EOPNOTSUPP;
3378                         goto out;
3379                 }
3380         }
3381
3382         smb2_set_sparse(xid, tcon, cfile, inode, false);
3383         rc = 0;
3384
3385 out:
3386         if (rc)
3387                 trace_smb3_falloc_err(xid, cfile->fid.persistent_fid, tcon->tid,
3388                                 tcon->ses->Suid, off, len, rc);
3389         else
3390                 trace_smb3_falloc_done(xid, cfile->fid.persistent_fid, tcon->tid,
3391                                 tcon->ses->Suid, off, len);
3392
3393         free_xid(xid);
3394         return rc;
3395 }
3396
3397 static loff_t smb3_llseek(struct file *file, struct cifs_tcon *tcon, loff_t offset, int whence)
3398 {
3399         struct cifsFileInfo *wrcfile, *cfile = file->private_data;
3400         struct cifsInodeInfo *cifsi;
3401         struct inode *inode;
3402         int rc = 0;
3403         struct file_allocated_range_buffer in_data, *out_data = NULL;
3404         u32 out_data_len;
3405         unsigned int xid;
3406
3407         if (whence != SEEK_HOLE && whence != SEEK_DATA)
3408                 return generic_file_llseek(file, offset, whence);
3409
3410         inode = d_inode(cfile->dentry);
3411         cifsi = CIFS_I(inode);
3412
3413         if (offset < 0 || offset >= i_size_read(inode))
3414                 return -ENXIO;
3415
3416         xid = get_xid();
3417         /*
3418          * We need to be sure that all dirty pages are written as they
3419          * might fill holes on the server.
3420          * Note that we also MUST flush any written pages since at least
3421          * some servers (Windows2016) will not reflect recent writes in
3422          * QUERY_ALLOCATED_RANGES until SMB2_flush is called.
3423          */
3424         wrcfile = find_writable_file(cifsi, FIND_WR_ANY);
3425         if (wrcfile) {
3426                 filemap_write_and_wait(inode->i_mapping);
3427                 smb2_flush_file(xid, tcon, &wrcfile->fid);
3428                 cifsFileInfo_put(wrcfile);
3429         }
3430
3431         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE)) {
3432                 if (whence == SEEK_HOLE)
3433                         offset = i_size_read(inode);
3434                 goto lseek_exit;
3435         }
3436
3437         in_data.file_offset = cpu_to_le64(offset);
3438         in_data.length = cpu_to_le64(i_size_read(inode));
3439
3440         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3441                         cfile->fid.volatile_fid,
3442                         FSCTL_QUERY_ALLOCATED_RANGES, true,
3443                         (char *)&in_data, sizeof(in_data),
3444                         sizeof(struct file_allocated_range_buffer),
3445                         (char **)&out_data, &out_data_len);
3446         if (rc == -E2BIG)
3447                 rc = 0;
3448         if (rc)
3449                 goto lseek_exit;
3450
3451         if (whence == SEEK_HOLE && out_data_len == 0)
3452                 goto lseek_exit;
3453
3454         if (whence == SEEK_DATA && out_data_len == 0) {
3455                 rc = -ENXIO;
3456                 goto lseek_exit;
3457         }
3458
3459         if (out_data_len < sizeof(struct file_allocated_range_buffer)) {
3460                 rc = -EINVAL;
3461                 goto lseek_exit;
3462         }
3463         if (whence == SEEK_DATA) {
3464                 offset = le64_to_cpu(out_data->file_offset);
3465                 goto lseek_exit;
3466         }
3467         if (offset < le64_to_cpu(out_data->file_offset))
3468                 goto lseek_exit;
3469
3470         offset = le64_to_cpu(out_data->file_offset) + le64_to_cpu(out_data->length);
3471
3472  lseek_exit:
3473         free_xid(xid);
3474         kfree(out_data);
3475         if (!rc)
3476                 return vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
3477         else
3478                 return rc;
3479 }
3480
3481 static int smb3_fiemap(struct cifs_tcon *tcon,
3482                        struct cifsFileInfo *cfile,
3483                        struct fiemap_extent_info *fei, u64 start, u64 len)
3484 {
3485         unsigned int xid;
3486         struct file_allocated_range_buffer in_data, *out_data;
3487         u32 out_data_len;
3488         int i, num, rc, flags, last_blob;
3489         u64 next;
3490
3491         rc = fiemap_prep(d_inode(cfile->dentry), fei, start, &len, 0);
3492         if (rc)
3493                 return rc;
3494
3495         xid = get_xid();
3496  again:
3497         in_data.file_offset = cpu_to_le64(start);
3498         in_data.length = cpu_to_le64(len);
3499
3500         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
3501                         cfile->fid.volatile_fid,
3502                         FSCTL_QUERY_ALLOCATED_RANGES, true,
3503                         (char *)&in_data, sizeof(in_data),
3504                         1024 * sizeof(struct file_allocated_range_buffer),
3505                         (char **)&out_data, &out_data_len);
3506         if (rc == -E2BIG) {
3507                 last_blob = 0;
3508                 rc = 0;
3509         } else
3510                 last_blob = 1;
3511         if (rc)
3512                 goto out;
3513
3514         if (out_data_len && out_data_len < sizeof(struct file_allocated_range_buffer)) {
3515                 rc = -EINVAL;
3516                 goto out;
3517         }
3518         if (out_data_len % sizeof(struct file_allocated_range_buffer)) {
3519                 rc = -EINVAL;
3520                 goto out;
3521         }
3522
3523         num = out_data_len / sizeof(struct file_allocated_range_buffer);
3524         for (i = 0; i < num; i++) {
3525                 flags = 0;
3526                 if (i == num - 1 && last_blob)
3527                         flags |= FIEMAP_EXTENT_LAST;
3528
3529                 rc = fiemap_fill_next_extent(fei,
3530                                 le64_to_cpu(out_data[i].file_offset),
3531                                 le64_to_cpu(out_data[i].file_offset),
3532                                 le64_to_cpu(out_data[i].length),
3533                                 flags);
3534                 if (rc < 0)
3535                         goto out;
3536                 if (rc == 1) {
3537                         rc = 0;
3538                         goto out;
3539                 }
3540         }
3541
3542         if (!last_blob) {
3543                 next = le64_to_cpu(out_data[num - 1].file_offset) +
3544                   le64_to_cpu(out_data[num - 1].length);
3545                 len = len - (next - start);
3546                 start = next;
3547                 goto again;
3548         }
3549
3550  out:
3551         free_xid(xid);
3552         kfree(out_data);
3553         return rc;
3554 }
3555
3556 static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
3557                            loff_t off, loff_t len)
3558 {
3559         /* KEEP_SIZE already checked for by do_fallocate */
3560         if (mode & FALLOC_FL_PUNCH_HOLE)
3561                 return smb3_punch_hole(file, tcon, off, len);
3562         else if (mode & FALLOC_FL_ZERO_RANGE) {
3563                 if (mode & FALLOC_FL_KEEP_SIZE)
3564                         return smb3_zero_range(file, tcon, off, len, true);
3565                 return smb3_zero_range(file, tcon, off, len, false);
3566         } else if (mode == FALLOC_FL_KEEP_SIZE)
3567                 return smb3_simple_falloc(file, tcon, off, len, true);
3568         else if (mode == 0)
3569                 return smb3_simple_falloc(file, tcon, off, len, false);
3570
3571         return -EOPNOTSUPP;
3572 }
3573
3574 static void
3575 smb2_downgrade_oplock(struct TCP_Server_Info *server,
3576                       struct cifsInodeInfo *cinode, __u32 oplock,
3577                       unsigned int epoch, bool *purge_cache)
3578 {
3579         server->ops->set_oplock_level(cinode, oplock, 0, NULL);
3580 }
3581
3582 static void
3583 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3584                        unsigned int epoch, bool *purge_cache);
3585
3586 static void
3587 smb3_downgrade_oplock(struct TCP_Server_Info *server,
3588                        struct cifsInodeInfo *cinode, __u32 oplock,
3589                        unsigned int epoch, bool *purge_cache)
3590 {
3591         unsigned int old_state = cinode->oplock;
3592         unsigned int old_epoch = cinode->epoch;
3593         unsigned int new_state;
3594
3595         if (epoch > old_epoch) {
3596                 smb21_set_oplock_level(cinode, oplock, 0, NULL);
3597                 cinode->epoch = epoch;
3598         }
3599
3600         new_state = cinode->oplock;
3601         *purge_cache = false;
3602
3603         if ((old_state & CIFS_CACHE_READ_FLG) != 0 &&
3604             (new_state & CIFS_CACHE_READ_FLG) == 0)
3605                 *purge_cache = true;
3606         else if (old_state == new_state && (epoch - old_epoch > 1))
3607                 *purge_cache = true;
3608 }
3609
3610 static void
3611 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3612                       unsigned int epoch, bool *purge_cache)
3613 {
3614         oplock &= 0xFF;
3615         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
3616                 return;
3617         if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
3618                 cinode->oplock = CIFS_CACHE_RHW_FLG;
3619                 cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
3620                          &cinode->vfs_inode);
3621         } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
3622                 cinode->oplock = CIFS_CACHE_RW_FLG;
3623                 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
3624                          &cinode->vfs_inode);
3625         } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
3626                 cinode->oplock = CIFS_CACHE_READ_FLG;
3627                 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
3628                          &cinode->vfs_inode);
3629         } else
3630                 cinode->oplock = 0;
3631 }
3632
3633 static void
3634 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3635                        unsigned int epoch, bool *purge_cache)
3636 {
3637         char message[5] = {0};
3638         unsigned int new_oplock = 0;
3639
3640         oplock &= 0xFF;
3641         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
3642                 return;
3643
3644         /* Check if the server granted an oplock rather than a lease */
3645         if (oplock & SMB2_OPLOCK_LEVEL_EXCLUSIVE)
3646                 return smb2_set_oplock_level(cinode, oplock, epoch,
3647                                              purge_cache);
3648
3649         if (oplock & SMB2_LEASE_READ_CACHING_HE) {
3650                 new_oplock |= CIFS_CACHE_READ_FLG;
3651                 strcat(message, "R");
3652         }
3653         if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
3654                 new_oplock |= CIFS_CACHE_HANDLE_FLG;
3655                 strcat(message, "H");
3656         }
3657         if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
3658                 new_oplock |= CIFS_CACHE_WRITE_FLG;
3659                 strcat(message, "W");
3660         }
3661         if (!new_oplock)
3662                 strncpy(message, "None", sizeof(message));
3663
3664         cinode->oplock = new_oplock;
3665         cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
3666                  &cinode->vfs_inode);
3667 }
3668
3669 static void
3670 smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
3671                       unsigned int epoch, bool *purge_cache)
3672 {
3673         unsigned int old_oplock = cinode->oplock;
3674
3675         smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
3676
3677         if (purge_cache) {
3678                 *purge_cache = false;
3679                 if (old_oplock == CIFS_CACHE_READ_FLG) {
3680                         if (cinode->oplock == CIFS_CACHE_READ_FLG &&
3681                             (epoch - cinode->epoch > 0))
3682                                 *purge_cache = true;
3683                         else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
3684                                  (epoch - cinode->epoch > 1))
3685                                 *purge_cache = true;
3686                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
3687                                  (epoch - cinode->epoch > 1))
3688                                 *purge_cache = true;
3689                         else if (cinode->oplock == 0 &&
3690                                  (epoch - cinode->epoch > 0))
3691                                 *purge_cache = true;
3692                 } else if (old_oplock == CIFS_CACHE_RH_FLG) {
3693                         if (cinode->oplock == CIFS_CACHE_RH_FLG &&
3694                             (epoch - cinode->epoch > 0))
3695                                 *purge_cache = true;
3696                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
3697                                  (epoch - cinode->epoch > 1))
3698                                 *purge_cache = true;
3699                 }
3700                 cinode->epoch = epoch;
3701         }
3702 }
3703
3704 static bool
3705 smb2_is_read_op(__u32 oplock)
3706 {
3707         return oplock == SMB2_OPLOCK_LEVEL_II;
3708 }
3709
3710 static bool
3711 smb21_is_read_op(__u32 oplock)
3712 {
3713         return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
3714                !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
3715 }
3716
3717 static __le32
3718 map_oplock_to_lease(u8 oplock)
3719 {
3720         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
3721                 return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
3722         else if (oplock == SMB2_OPLOCK_LEVEL_II)
3723                 return SMB2_LEASE_READ_CACHING;
3724         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
3725                 return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
3726                        SMB2_LEASE_WRITE_CACHING;
3727         return 0;
3728 }
3729
3730 static char *
3731 smb2_create_lease_buf(u8 *lease_key, u8 oplock)
3732 {
3733         struct create_lease *buf;
3734
3735         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
3736         if (!buf)
3737                 return NULL;
3738
3739         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
3740         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
3741
3742         buf->ccontext.DataOffset = cpu_to_le16(offsetof
3743                                         (struct create_lease, lcontext));
3744         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
3745         buf->ccontext.NameOffset = cpu_to_le16(offsetof
3746                                 (struct create_lease, Name));
3747         buf->ccontext.NameLength = cpu_to_le16(4);
3748         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
3749         buf->Name[0] = 'R';
3750         buf->Name[1] = 'q';
3751         buf->Name[2] = 'L';
3752         buf->Name[3] = 's';
3753         return (char *)buf;
3754 }
3755
3756 static char *
3757 smb3_create_lease_buf(u8 *lease_key, u8 oplock)
3758 {
3759         struct create_lease_v2 *buf;
3760
3761         buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
3762         if (!buf)
3763                 return NULL;
3764
3765         memcpy(&buf->lcontext.LeaseKey, lease_key, SMB2_LEASE_KEY_SIZE);
3766         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
3767
3768         buf->ccontext.DataOffset = cpu_to_le16(offsetof
3769                                         (struct create_lease_v2, lcontext));
3770         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
3771         buf->ccontext.NameOffset = cpu_to_le16(offsetof
3772                                 (struct create_lease_v2, Name));
3773         buf->ccontext.NameLength = cpu_to_le16(4);
3774         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
3775         buf->Name[0] = 'R';
3776         buf->Name[1] = 'q';
3777         buf->Name[2] = 'L';
3778         buf->Name[3] = 's';
3779         return (char *)buf;
3780 }
3781
3782 static __u8
3783 smb2_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
3784 {
3785         struct create_lease *lc = (struct create_lease *)buf;
3786
3787         *epoch = 0; /* not used */
3788         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
3789                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
3790         return le32_to_cpu(lc->lcontext.LeaseState);
3791 }
3792
3793 static __u8
3794 smb3_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
3795 {
3796         struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
3797
3798         *epoch = le16_to_cpu(lc->lcontext.Epoch);
3799         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
3800                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
3801         if (lease_key)
3802                 memcpy(lease_key, &lc->lcontext.LeaseKey, SMB2_LEASE_KEY_SIZE);
3803         return le32_to_cpu(lc->lcontext.LeaseState);
3804 }
3805
3806 static unsigned int
3807 smb2_wp_retry_size(struct inode *inode)
3808 {
3809         return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
3810                      SMB2_MAX_BUFFER_SIZE);
3811 }
3812
3813 static bool
3814 smb2_dir_needs_close(struct cifsFileInfo *cfile)
3815 {
3816         return !cfile->invalidHandle;
3817 }
3818
3819 static void
3820 fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, unsigned int orig_len,
3821                    struct smb_rqst *old_rq, __le16 cipher_type)
3822 {
3823         struct smb2_sync_hdr *shdr =
3824                         (struct smb2_sync_hdr *)old_rq->rq_iov[0].iov_base;
3825
3826         memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
3827         tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
3828         tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
3829         tr_hdr->Flags = cpu_to_le16(0x01);
3830         if ((cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
3831             (cipher_type == SMB2_ENCRYPTION_AES256_GCM))
3832                 get_random_bytes(&tr_hdr->Nonce, SMB3_AES_GCM_NONCE);
3833         else
3834                 get_random_bytes(&tr_hdr->Nonce, SMB3_AES_CCM_NONCE);
3835         memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
3836 }
3837
3838 /* We can not use the normal sg_set_buf() as we will sometimes pass a
3839  * stack object as buf.
3840  */
3841 static inline void smb2_sg_set_buf(struct scatterlist *sg, const void *buf,
3842                                    unsigned int buflen)
3843 {
3844         void *addr;
3845         /*
3846          * VMAP_STACK (at least) puts stack into the vmalloc address space
3847          */
3848         if (is_vmalloc_addr(buf))
3849                 addr = vmalloc_to_page(buf);
3850         else
3851                 addr = virt_to_page(buf);
3852         sg_set_page(sg, addr, buflen, offset_in_page(buf));
3853 }
3854
3855 /* Assumes the first rqst has a transform header as the first iov.
3856  * I.e.
3857  * rqst[0].rq_iov[0]  is transform header
3858  * rqst[0].rq_iov[1+] data to be encrypted/decrypted
3859  * rqst[1+].rq_iov[0+] data to be encrypted/decrypted
3860  */
3861 static struct scatterlist *
3862 init_sg(int num_rqst, struct smb_rqst *rqst, u8 *sign)
3863 {
3864         unsigned int sg_len;
3865         struct scatterlist *sg;
3866         unsigned int i;
3867         unsigned int j;
3868         unsigned int idx = 0;
3869         int skip;
3870
3871         sg_len = 1;
3872         for (i = 0; i < num_rqst; i++)
3873                 sg_len += rqst[i].rq_nvec + rqst[i].rq_npages;
3874
3875         sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
3876         if (!sg)
3877                 return NULL;
3878
3879         sg_init_table(sg, sg_len);
3880         for (i = 0; i < num_rqst; i++) {
3881                 for (j = 0; j < rqst[i].rq_nvec; j++) {
3882                         /*
3883                          * The first rqst has a transform header where the
3884                          * first 20 bytes are not part of the encrypted blob
3885                          */
3886                         skip = (i == 0) && (j == 0) ? 20 : 0;
3887                         smb2_sg_set_buf(&sg[idx++],
3888                                         rqst[i].rq_iov[j].iov_base + skip,
3889                                         rqst[i].rq_iov[j].iov_len - skip);
3890                         }
3891
3892                 for (j = 0; j < rqst[i].rq_npages; j++) {
3893                         unsigned int len, offset;
3894
3895                         rqst_page_get_length(&rqst[i], j, &len, &offset);
3896                         sg_set_page(&sg[idx++], rqst[i].rq_pages[j], len, offset);
3897                 }
3898         }
3899         smb2_sg_set_buf(&sg[idx], sign, SMB2_SIGNATURE_SIZE);
3900         return sg;
3901 }
3902
3903 static int
3904 smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
3905 {
3906         struct cifs_ses *ses;
3907         u8 *ses_enc_key;
3908
3909         spin_lock(&cifs_tcp_ses_lock);
3910         list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
3911                 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3912                         if (ses->Suid == ses_id) {
3913                                 ses_enc_key = enc ? ses->smb3encryptionkey :
3914                                         ses->smb3decryptionkey;
3915                                 memcpy(key, ses_enc_key, SMB3_SIGN_KEY_SIZE);
3916                                 spin_unlock(&cifs_tcp_ses_lock);
3917                                 return 0;
3918                         }
3919                 }
3920         }
3921         spin_unlock(&cifs_tcp_ses_lock);
3922
3923         return 1;
3924 }
3925 /*
3926  * Encrypt or decrypt @rqst message. @rqst[0] has the following format:
3927  * iov[0]   - transform header (associate data),
3928  * iov[1-N] - SMB2 header and pages - data to encrypt.
3929  * On success return encrypted data in iov[1-N] and pages, leave iov[0]
3930  * untouched.
3931  */
3932 static int
3933 crypt_message(struct TCP_Server_Info *server, int num_rqst,
3934               struct smb_rqst *rqst, int enc)
3935 {
3936         struct smb2_transform_hdr *tr_hdr =
3937                 (struct smb2_transform_hdr *)rqst[0].rq_iov[0].iov_base;
3938         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 20;
3939         int rc = 0;
3940         struct scatterlist *sg;
3941         u8 sign[SMB2_SIGNATURE_SIZE] = {};
3942         u8 key[SMB3_SIGN_KEY_SIZE];
3943         struct aead_request *req;
3944         char *iv;
3945         unsigned int iv_len;
3946         DECLARE_CRYPTO_WAIT(wait);
3947         struct crypto_aead *tfm;
3948         unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
3949
3950         rc = smb2_get_enc_key(server, tr_hdr->SessionId, enc, key);
3951         if (rc) {
3952                 cifs_server_dbg(VFS, "%s: Could not get %scryption key\n", __func__,
3953                          enc ? "en" : "de");
3954                 return rc;
3955         }
3956
3957         rc = smb3_crypto_aead_allocate(server);
3958         if (rc) {
3959                 cifs_server_dbg(VFS, "%s: crypto alloc failed\n", __func__);
3960                 return rc;
3961         }
3962
3963         tfm = enc ? server->secmech.ccmaesencrypt :
3964                                                 server->secmech.ccmaesdecrypt;
3965
3966         if (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
3967                 rc = crypto_aead_setkey(tfm, key, SMB3_GCM256_CRYPTKEY_SIZE);
3968         else
3969                 rc = crypto_aead_setkey(tfm, key, SMB3_SIGN_KEY_SIZE);
3970
3971         if (rc) {
3972                 cifs_server_dbg(VFS, "%s: Failed to set aead key %d\n", __func__, rc);
3973                 return rc;
3974         }
3975
3976         rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
3977         if (rc) {
3978                 cifs_server_dbg(VFS, "%s: Failed to set authsize %d\n", __func__, rc);
3979                 return rc;
3980         }
3981
3982         req = aead_request_alloc(tfm, GFP_KERNEL);
3983         if (!req) {
3984                 cifs_server_dbg(VFS, "%s: Failed to alloc aead request\n", __func__);
3985                 return -ENOMEM;
3986         }
3987
3988         if (!enc) {
3989                 memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
3990                 crypt_len += SMB2_SIGNATURE_SIZE;
3991         }
3992
3993         sg = init_sg(num_rqst, rqst, sign);
3994         if (!sg) {
3995                 cifs_server_dbg(VFS, "%s: Failed to init sg\n", __func__);
3996                 rc = -ENOMEM;
3997                 goto free_req;
3998         }
3999
4000         iv_len = crypto_aead_ivsize(tfm);
4001         iv = kzalloc(iv_len, GFP_KERNEL);
4002         if (!iv) {
4003                 cifs_server_dbg(VFS, "%s: Failed to alloc iv\n", __func__);
4004                 rc = -ENOMEM;
4005                 goto free_sg;
4006         }
4007
4008         if ((server->cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
4009             (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
4010                 memcpy(iv, (char *)tr_hdr->Nonce, SMB3_AES_GCM_NONCE);
4011         else {
4012                 iv[0] = 3;
4013                 memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES_CCM_NONCE);
4014         }
4015
4016         aead_request_set_crypt(req, sg, sg, crypt_len, iv);
4017         aead_request_set_ad(req, assoc_data_len);
4018
4019         aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
4020                                   crypto_req_done, &wait);
4021
4022         rc = crypto_wait_req(enc ? crypto_aead_encrypt(req)
4023                                 : crypto_aead_decrypt(req), &wait);
4024
4025         if (!rc && enc)
4026                 memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
4027
4028         kfree(iv);
4029 free_sg:
4030         kfree(sg);
4031 free_req:
4032         kfree(req);
4033         return rc;
4034 }
4035
4036 void
4037 smb3_free_compound_rqst(int num_rqst, struct smb_rqst *rqst)
4038 {
4039         int i, j;
4040
4041         for (i = 0; i < num_rqst; i++) {
4042                 if (rqst[i].rq_pages) {
4043                         for (j = rqst[i].rq_npages - 1; j >= 0; j--)
4044                                 put_page(rqst[i].rq_pages[j]);
4045                         kfree(rqst[i].rq_pages);
4046                 }
4047         }
4048 }
4049
4050 /*
4051  * This function will initialize new_rq and encrypt the content.
4052  * The first entry, new_rq[0], only contains a single iov which contains
4053  * a smb2_transform_hdr and is pre-allocated by the caller.
4054  * This function then populates new_rq[1+] with the content from olq_rq[0+].
4055  *
4056  * The end result is an array of smb_rqst structures where the first structure
4057  * only contains a single iov for the transform header which we then can pass
4058  * to crypt_message().
4059  *
4060  * new_rq[0].rq_iov[0] :  smb2_transform_hdr pre-allocated by the caller
4061  * new_rq[1+].rq_iov[*] == old_rq[0+].rq_iov[*] : SMB2/3 requests
4062  */
4063 static int
4064 smb3_init_transform_rq(struct TCP_Server_Info *server, int num_rqst,
4065                        struct smb_rqst *new_rq, struct smb_rqst *old_rq)
4066 {
4067         struct page **pages;
4068         struct smb2_transform_hdr *tr_hdr = new_rq[0].rq_iov[0].iov_base;
4069         unsigned int npages;
4070         unsigned int orig_len = 0;
4071         int i, j;
4072         int rc = -ENOMEM;
4073
4074         for (i = 1; i < num_rqst; i++) {
4075                 npages = old_rq[i - 1].rq_npages;
4076                 pages = kmalloc_array(npages, sizeof(struct page *),
4077                                       GFP_KERNEL);
4078                 if (!pages)
4079                         goto err_free;
4080
4081                 new_rq[i].rq_pages = pages;
4082                 new_rq[i].rq_npages = npages;
4083                 new_rq[i].rq_offset = old_rq[i - 1].rq_offset;
4084                 new_rq[i].rq_pagesz = old_rq[i - 1].rq_pagesz;
4085                 new_rq[i].rq_tailsz = old_rq[i - 1].rq_tailsz;
4086                 new_rq[i].rq_iov = old_rq[i - 1].rq_iov;
4087                 new_rq[i].rq_nvec = old_rq[i - 1].rq_nvec;
4088
4089                 orig_len += smb_rqst_len(server, &old_rq[i - 1]);
4090
4091                 for (j = 0; j < npages; j++) {
4092                         pages[j] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
4093                         if (!pages[j])
4094                                 goto err_free;
4095                 }
4096
4097                 /* copy pages form the old */
4098                 for (j = 0; j < npages; j++) {
4099                         char *dst, *src;
4100                         unsigned int offset, len;
4101
4102                         rqst_page_get_length(&new_rq[i], j, &len, &offset);
4103
4104                         dst = (char *) kmap(new_rq[i].rq_pages[j]) + offset;
4105                         src = (char *) kmap(old_rq[i - 1].rq_pages[j]) + offset;
4106
4107                         memcpy(dst, src, len);
4108                         kunmap(new_rq[i].rq_pages[j]);
4109                         kunmap(old_rq[i - 1].rq_pages[j]);
4110                 }
4111         }
4112
4113         /* fill the 1st iov with a transform header */
4114         fill_transform_hdr(tr_hdr, orig_len, old_rq, server->cipher_type);
4115
4116         rc = crypt_message(server, num_rqst, new_rq, 1);
4117         cifs_dbg(FYI, "Encrypt message returned %d\n", rc);
4118         if (rc)
4119                 goto err_free;
4120
4121         return rc;
4122
4123 err_free:
4124         smb3_free_compound_rqst(num_rqst - 1, &new_rq[1]);
4125         return rc;
4126 }
4127
4128 static int
4129 smb3_is_transform_hdr(void *buf)
4130 {
4131         struct smb2_transform_hdr *trhdr = buf;
4132
4133         return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
4134 }
4135
4136 static int
4137 decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
4138                  unsigned int buf_data_size, struct page **pages,
4139                  unsigned int npages, unsigned int page_data_size,
4140                  bool is_offloaded)
4141 {
4142         struct kvec iov[2];
4143         struct smb_rqst rqst = {NULL};
4144         int rc;
4145
4146         iov[0].iov_base = buf;
4147         iov[0].iov_len = sizeof(struct smb2_transform_hdr);
4148         iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
4149         iov[1].iov_len = buf_data_size;
4150
4151         rqst.rq_iov = iov;
4152         rqst.rq_nvec = 2;
4153         rqst.rq_pages = pages;
4154         rqst.rq_npages = npages;
4155         rqst.rq_pagesz = PAGE_SIZE;
4156         rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
4157
4158         rc = crypt_message(server, 1, &rqst, 0);
4159         cifs_dbg(FYI, "Decrypt message returned %d\n", rc);
4160
4161         if (rc)
4162                 return rc;
4163
4164         memmove(buf, iov[1].iov_base, buf_data_size);
4165
4166         if (!is_offloaded)
4167                 server->total_read = buf_data_size + page_data_size;
4168
4169         return rc;
4170 }
4171
4172 static int
4173 read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
4174                      unsigned int npages, unsigned int len)
4175 {
4176         int i;
4177         int length;
4178
4179         for (i = 0; i < npages; i++) {
4180                 struct page *page = pages[i];
4181                 size_t n;
4182
4183                 n = len;
4184                 if (len >= PAGE_SIZE) {
4185                         /* enough data to fill the page */
4186                         n = PAGE_SIZE;
4187                         len -= n;
4188                 } else {
4189                         zero_user(page, len, PAGE_SIZE - len);
4190                         len = 0;
4191                 }
4192                 length = cifs_read_page_from_socket(server, page, 0, n);
4193                 if (length < 0)
4194                         return length;
4195                 server->total_read += length;
4196         }
4197
4198         return 0;
4199 }
4200
4201 static int
4202 init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
4203                unsigned int cur_off, struct bio_vec **page_vec)
4204 {
4205         struct bio_vec *bvec;
4206         int i;
4207
4208         bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
4209         if (!bvec)
4210                 return -ENOMEM;
4211
4212         for (i = 0; i < npages; i++) {
4213                 bvec[i].bv_page = pages[i];
4214                 bvec[i].bv_offset = (i == 0) ? cur_off : 0;
4215                 bvec[i].bv_len = min_t(unsigned int, PAGE_SIZE, data_size);
4216                 data_size -= bvec[i].bv_len;
4217         }
4218
4219         if (data_size != 0) {
4220                 cifs_dbg(VFS, "%s: something went wrong\n", __func__);
4221                 kfree(bvec);
4222                 return -EIO;
4223         }
4224
4225         *page_vec = bvec;
4226         return 0;
4227 }
4228
4229 static int
4230 handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
4231                  char *buf, unsigned int buf_len, struct page **pages,
4232                  unsigned int npages, unsigned int page_data_size)
4233 {
4234         unsigned int data_offset;
4235         unsigned int data_len;
4236         unsigned int cur_off;
4237         unsigned int cur_page_idx;
4238         unsigned int pad_len;
4239         struct cifs_readdata *rdata = mid->callback_data;
4240         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
4241         struct bio_vec *bvec = NULL;
4242         struct iov_iter iter;
4243         struct kvec iov;
4244         int length;
4245         bool use_rdma_mr = false;
4246
4247         if (shdr->Command != SMB2_READ) {
4248                 cifs_server_dbg(VFS, "only big read responses are supported\n");
4249                 return -ENOTSUPP;
4250         }
4251
4252         if (server->ops->is_session_expired &&
4253             server->ops->is_session_expired(buf)) {
4254                 cifs_reconnect(server);
4255                 return -1;
4256         }
4257
4258         if (server->ops->is_status_pending &&
4259                         server->ops->is_status_pending(buf, server))
4260                 return -1;
4261
4262         /* set up first two iov to get credits */
4263         rdata->iov[0].iov_base = buf;
4264         rdata->iov[0].iov_len = 0;
4265         rdata->iov[1].iov_base = buf;
4266         rdata->iov[1].iov_len =
4267                 min_t(unsigned int, buf_len, server->vals->read_rsp_size);
4268         cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
4269                  rdata->iov[0].iov_base, rdata->iov[0].iov_len);
4270         cifs_dbg(FYI, "1: iov_base=%p iov_len=%zu\n",
4271                  rdata->iov[1].iov_base, rdata->iov[1].iov_len);
4272
4273         rdata->result = server->ops->map_error(buf, true);
4274         if (rdata->result != 0) {
4275                 cifs_dbg(FYI, "%s: server returned error %d\n",
4276                          __func__, rdata->result);
4277                 /* normal error on read response */
4278                 dequeue_mid(mid, false);
4279                 return 0;
4280         }
4281
4282         data_offset = server->ops->read_data_offset(buf);
4283 #ifdef CONFIG_CIFS_SMB_DIRECT
4284         use_rdma_mr = rdata->mr;
4285 #endif
4286         data_len = server->ops->read_data_length(buf, use_rdma_mr);
4287
4288         if (data_offset < server->vals->read_rsp_size) {
4289                 /*
4290                  * win2k8 sometimes sends an offset of 0 when the read
4291                  * is beyond the EOF. Treat it as if the data starts just after
4292                  * the header.
4293                  */
4294                 cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
4295                          __func__, data_offset);
4296                 data_offset = server->vals->read_rsp_size;
4297         } else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
4298                 /* data_offset is beyond the end of smallbuf */
4299                 cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
4300                          __func__, data_offset);
4301                 rdata->result = -EIO;
4302                 dequeue_mid(mid, rdata->result);
4303                 return 0;
4304         }
4305
4306         pad_len = data_offset - server->vals->read_rsp_size;
4307
4308         if (buf_len <= data_offset) {
4309                 /* read response payload is in pages */
4310                 cur_page_idx = pad_len / PAGE_SIZE;
4311                 cur_off = pad_len % PAGE_SIZE;
4312
4313                 if (cur_page_idx != 0) {
4314                         /* data offset is beyond the 1st page of response */
4315                         cifs_dbg(FYI, "%s: data offset (%u) beyond 1st page of response\n",
4316                                  __func__, data_offset);
4317                         rdata->result = -EIO;
4318                         dequeue_mid(mid, rdata->result);
4319                         return 0;
4320                 }
4321
4322                 if (data_len > page_data_size - pad_len) {
4323                         /* data_len is corrupt -- discard frame */
4324                         rdata->result = -EIO;
4325                         dequeue_mid(mid, rdata->result);
4326                         return 0;
4327                 }
4328
4329                 rdata->result = init_read_bvec(pages, npages, page_data_size,
4330                                                cur_off, &bvec);
4331                 if (rdata->result != 0) {
4332                         dequeue_mid(mid, rdata->result);
4333                         return 0;
4334                 }
4335
4336                 iov_iter_bvec(&iter, WRITE, bvec, npages, data_len);
4337         } else if (buf_len >= data_offset + data_len) {
4338                 /* read response payload is in buf */
4339                 WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
4340                 iov.iov_base = buf + data_offset;
4341                 iov.iov_len = data_len;
4342                 iov_iter_kvec(&iter, WRITE, &iov, 1, data_len);
4343         } else {
4344                 /* read response payload cannot be in both buf and pages */
4345                 WARN_ONCE(1, "buf can not contain only a part of read data");
4346                 rdata->result = -EIO;
4347                 dequeue_mid(mid, rdata->result);
4348                 return 0;
4349         }
4350
4351         length = rdata->copy_into_pages(server, rdata, &iter);
4352
4353         kfree(bvec);
4354
4355         if (length < 0)
4356                 return length;
4357
4358         dequeue_mid(mid, false);
4359         return length;
4360 }
4361
4362 struct smb2_decrypt_work {
4363         struct work_struct decrypt;
4364         struct TCP_Server_Info *server;
4365         struct page **ppages;
4366         char *buf;
4367         unsigned int npages;
4368         unsigned int len;
4369 };
4370
4371
4372 static void smb2_decrypt_offload(struct work_struct *work)
4373 {
4374         struct smb2_decrypt_work *dw = container_of(work,
4375                                 struct smb2_decrypt_work, decrypt);
4376         int i, rc;
4377         struct mid_q_entry *mid;
4378
4379         rc = decrypt_raw_data(dw->server, dw->buf, dw->server->vals->read_rsp_size,
4380                               dw->ppages, dw->npages, dw->len, true);
4381         if (rc) {
4382                 cifs_dbg(VFS, "error decrypting rc=%d\n", rc);
4383                 goto free_pages;
4384         }
4385
4386         dw->server->lstrp = jiffies;
4387         mid = smb2_find_mid(dw->server, dw->buf);
4388         if (mid == NULL)
4389                 cifs_dbg(FYI, "mid not found\n");
4390         else {
4391                 mid->decrypted = true;
4392                 rc = handle_read_data(dw->server, mid, dw->buf,
4393                                       dw->server->vals->read_rsp_size,
4394                                       dw->ppages, dw->npages, dw->len);
4395                 mid->callback(mid);
4396                 cifs_mid_q_entry_release(mid);
4397         }
4398
4399 free_pages:
4400         for (i = dw->npages-1; i >= 0; i--)
4401                 put_page(dw->ppages[i]);
4402
4403         kfree(dw->ppages);
4404         cifs_small_buf_release(dw->buf);
4405         kfree(dw);
4406 }
4407
4408
4409 static int
4410 receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid,
4411                        int *num_mids)
4412 {
4413         char *buf = server->smallbuf;
4414         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
4415         unsigned int npages;
4416         struct page **pages;
4417         unsigned int len;
4418         unsigned int buflen = server->pdu_size;
4419         int rc;
4420         int i = 0;
4421         struct smb2_decrypt_work *dw;
4422
4423         *num_mids = 1;
4424         len = min_t(unsigned int, buflen, server->vals->read_rsp_size +
4425                 sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
4426
4427         rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
4428         if (rc < 0)
4429                 return rc;
4430         server->total_read += rc;
4431
4432         len = le32_to_cpu(tr_hdr->OriginalMessageSize) -
4433                 server->vals->read_rsp_size;
4434         npages = DIV_ROUND_UP(len, PAGE_SIZE);
4435
4436         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
4437         if (!pages) {
4438                 rc = -ENOMEM;
4439                 goto discard_data;
4440         }
4441
4442         for (; i < npages; i++) {
4443                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
4444                 if (!pages[i]) {
4445                         rc = -ENOMEM;
4446                         goto discard_data;
4447                 }
4448         }
4449
4450         /* read read data into pages */
4451         rc = read_data_into_pages(server, pages, npages, len);
4452         if (rc)
4453                 goto free_pages;
4454
4455         rc = cifs_discard_remaining_data(server);
4456         if (rc)
4457                 goto free_pages;
4458
4459         /*
4460          * For large reads, offload to different thread for better performance,
4461          * use more cores decrypting which can be expensive
4462          */
4463
4464         if ((server->min_offload) && (server->in_flight > 1) &&
4465             (server->pdu_size >= server->min_offload)) {
4466                 dw = kmalloc(sizeof(struct smb2_decrypt_work), GFP_KERNEL);
4467                 if (dw == NULL)
4468                         goto non_offloaded_decrypt;
4469
4470                 dw->buf = server->smallbuf;
4471                 server->smallbuf = (char *)cifs_small_buf_get();
4472
4473                 INIT_WORK(&dw->decrypt, smb2_decrypt_offload);
4474
4475                 dw->npages = npages;
4476                 dw->server = server;
4477                 dw->ppages = pages;
4478                 dw->len = len;
4479                 queue_work(decrypt_wq, &dw->decrypt);
4480                 *num_mids = 0; /* worker thread takes care of finding mid */
4481                 return -1;
4482         }
4483
4484 non_offloaded_decrypt:
4485         rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size,
4486                               pages, npages, len, false);
4487         if (rc)
4488                 goto free_pages;
4489
4490         *mid = smb2_find_mid(server, buf);
4491         if (*mid == NULL)
4492                 cifs_dbg(FYI, "mid not found\n");
4493         else {
4494                 cifs_dbg(FYI, "mid found\n");
4495                 (*mid)->decrypted = true;
4496                 rc = handle_read_data(server, *mid, buf,
4497                                       server->vals->read_rsp_size,
4498                                       pages, npages, len);
4499         }
4500
4501 free_pages:
4502         for (i = i - 1; i >= 0; i--)
4503                 put_page(pages[i]);
4504         kfree(pages);
4505         return rc;
4506 discard_data:
4507         cifs_discard_remaining_data(server);
4508         goto free_pages;
4509 }
4510
4511 static int
4512 receive_encrypted_standard(struct TCP_Server_Info *server,
4513                            struct mid_q_entry **mids, char **bufs,
4514                            int *num_mids)
4515 {
4516         int ret, length;
4517         char *buf = server->smallbuf;
4518         struct smb2_sync_hdr *shdr;
4519         unsigned int pdu_length = server->pdu_size;
4520         unsigned int buf_size;
4521         struct mid_q_entry *mid_entry;
4522         int next_is_large;
4523         char *next_buffer = NULL;
4524
4525         *num_mids = 0;
4526
4527         /* switch to large buffer if too big for a small one */
4528         if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE) {
4529                 server->large_buf = true;
4530                 memcpy(server->bigbuf, buf, server->total_read);
4531                 buf = server->bigbuf;
4532         }
4533
4534         /* now read the rest */
4535         length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
4536                                 pdu_length - HEADER_SIZE(server) + 1);
4537         if (length < 0)
4538                 return length;
4539         server->total_read += length;
4540
4541         buf_size = pdu_length - sizeof(struct smb2_transform_hdr);
4542         length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0, false);
4543         if (length)
4544                 return length;
4545
4546         next_is_large = server->large_buf;
4547 one_more:
4548         shdr = (struct smb2_sync_hdr *)buf;
4549         if (shdr->NextCommand) {
4550                 if (next_is_large)
4551                         next_buffer = (char *)cifs_buf_get();
4552                 else
4553                         next_buffer = (char *)cifs_small_buf_get();
4554                 memcpy(next_buffer,
4555                        buf + le32_to_cpu(shdr->NextCommand),
4556                        pdu_length - le32_to_cpu(shdr->NextCommand));
4557         }
4558
4559         mid_entry = smb2_find_mid(server, buf);
4560         if (mid_entry == NULL)
4561                 cifs_dbg(FYI, "mid not found\n");
4562         else {
4563                 cifs_dbg(FYI, "mid found\n");
4564                 mid_entry->decrypted = true;
4565                 mid_entry->resp_buf_size = server->pdu_size;
4566         }
4567
4568         if (*num_mids >= MAX_COMPOUND) {
4569                 cifs_server_dbg(VFS, "too many PDUs in compound\n");
4570                 return -1;
4571         }
4572         bufs[*num_mids] = buf;
4573         mids[(*num_mids)++] = mid_entry;
4574
4575         if (mid_entry && mid_entry->handle)
4576                 ret = mid_entry->handle(server, mid_entry);
4577         else
4578                 ret = cifs_handle_standard(server, mid_entry);
4579
4580         if (ret == 0 && shdr->NextCommand) {
4581                 pdu_length -= le32_to_cpu(shdr->NextCommand);
4582                 server->large_buf = next_is_large;
4583                 if (next_is_large)
4584                         server->bigbuf = buf = next_buffer;
4585                 else
4586                         server->smallbuf = buf = next_buffer;
4587                 goto one_more;
4588         } else if (ret != 0) {
4589                 /*
4590                  * ret != 0 here means that we didn't get to handle_mid() thus
4591                  * server->smallbuf and server->bigbuf are still valid. We need
4592                  * to free next_buffer because it is not going to be used
4593                  * anywhere.
4594                  */
4595                 if (next_is_large)
4596                         free_rsp_buf(CIFS_LARGE_BUFFER, next_buffer);
4597                 else
4598                         free_rsp_buf(CIFS_SMALL_BUFFER, next_buffer);
4599         }
4600
4601         return ret;
4602 }
4603
4604 static int
4605 smb3_receive_transform(struct TCP_Server_Info *server,
4606                        struct mid_q_entry **mids, char **bufs, int *num_mids)
4607 {
4608         char *buf = server->smallbuf;
4609         unsigned int pdu_length = server->pdu_size;
4610         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
4611         unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
4612
4613         if (pdu_length < sizeof(struct smb2_transform_hdr) +
4614                                                 sizeof(struct smb2_sync_hdr)) {
4615                 cifs_server_dbg(VFS, "Transform message is too small (%u)\n",
4616                          pdu_length);
4617                 cifs_reconnect(server);
4618                 return -ECONNABORTED;
4619         }
4620
4621         if (pdu_length < orig_len + sizeof(struct smb2_transform_hdr)) {
4622                 cifs_server_dbg(VFS, "Transform message is broken\n");
4623                 cifs_reconnect(server);
4624                 return -ECONNABORTED;
4625         }
4626
4627         /* TODO: add support for compounds containing READ. */
4628         if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server)) {
4629                 return receive_encrypted_read(server, &mids[0], num_mids);
4630         }
4631
4632         return receive_encrypted_standard(server, mids, bufs, num_mids);
4633 }
4634
4635 int
4636 smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
4637 {
4638         char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
4639
4640         return handle_read_data(server, mid, buf, server->pdu_size,
4641                                 NULL, 0, 0);
4642 }
4643
4644 static int
4645 smb2_next_header(char *buf)
4646 {
4647         struct smb2_sync_hdr *hdr = (struct smb2_sync_hdr *)buf;
4648         struct smb2_transform_hdr *t_hdr = (struct smb2_transform_hdr *)buf;
4649
4650         if (hdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM)
4651                 return sizeof(struct smb2_transform_hdr) +
4652                   le32_to_cpu(t_hdr->OriginalMessageSize);
4653
4654         return le32_to_cpu(hdr->NextCommand);
4655 }
4656
4657 static int
4658 smb2_make_node(unsigned int xid, struct inode *inode,
4659                struct dentry *dentry, struct cifs_tcon *tcon,
4660                char *full_path, umode_t mode, dev_t dev)
4661 {
4662         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
4663         int rc = -EPERM;
4664         FILE_ALL_INFO *buf = NULL;
4665         struct cifs_io_parms io_parms = {0};
4666         __u32 oplock = 0;
4667         struct cifs_fid fid;
4668         struct cifs_open_parms oparms;
4669         unsigned int bytes_written;
4670         struct win_dev *pdev;
4671         struct kvec iov[2];
4672
4673         /*
4674          * Check if mounted with mount parm 'sfu' mount parm.
4675          * SFU emulation should work with all servers, but only
4676          * supports block and char device (no socket & fifo),
4677          * and was used by default in earlier versions of Windows
4678          */
4679         if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))
4680                 goto out;
4681
4682         /*
4683          * TODO: Add ability to create instead via reparse point. Windows (e.g.
4684          * their current NFS server) uses this approach to expose special files
4685          * over SMB2/SMB3 and Samba will do this with SMB3.1.1 POSIX Extensions
4686          */
4687
4688         if (!S_ISCHR(mode) && !S_ISBLK(mode))
4689                 goto out;
4690
4691         cifs_dbg(FYI, "sfu compat create special file\n");
4692
4693         buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
4694         if (buf == NULL) {
4695                 rc = -ENOMEM;
4696                 goto out;
4697         }
4698
4699         oparms.tcon = tcon;
4700         oparms.cifs_sb = cifs_sb;
4701         oparms.desired_access = GENERIC_WRITE;
4702         oparms.create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR |
4703                                                     CREATE_OPTION_SPECIAL);
4704         oparms.disposition = FILE_CREATE;
4705         oparms.path = full_path;
4706         oparms.fid = &fid;
4707         oparms.reconnect = false;
4708
4709         if (tcon->ses->server->oplocks)
4710                 oplock = REQ_OPLOCK;
4711         else
4712                 oplock = 0;
4713         rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, buf);
4714         if (rc)
4715                 goto out;
4716
4717         /*
4718          * BB Do not bother to decode buf since no local inode yet to put
4719          * timestamps in, but we can reuse it safely.
4720          */
4721
4722         pdev = (struct win_dev *)buf;
4723         io_parms.pid = current->tgid;
4724         io_parms.tcon = tcon;
4725         io_parms.offset = 0;
4726         io_parms.length = sizeof(struct win_dev);
4727         iov[1].iov_base = buf;
4728         iov[1].iov_len = sizeof(struct win_dev);
4729         if (S_ISCHR(mode)) {
4730                 memcpy(pdev->type, "IntxCHR", 8);
4731                 pdev->major = cpu_to_le64(MAJOR(dev));
4732                 pdev->minor = cpu_to_le64(MINOR(dev));
4733                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
4734                                                         &bytes_written, iov, 1);
4735         } else if (S_ISBLK(mode)) {
4736                 memcpy(pdev->type, "IntxBLK", 8);
4737                 pdev->major = cpu_to_le64(MAJOR(dev));
4738                 pdev->minor = cpu_to_le64(MINOR(dev));
4739                 rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms,
4740                                                         &bytes_written, iov, 1);
4741         }
4742         tcon->ses->server->ops->close(xid, tcon, &fid);
4743         d_drop(dentry);
4744
4745         /* FIXME: add code here to set EAs */
4746 out:
4747         kfree(buf);
4748         return rc;
4749 }
4750
4751
4752 struct smb_version_operations smb20_operations = {
4753         .compare_fids = smb2_compare_fids,
4754         .setup_request = smb2_setup_request,
4755         .setup_async_request = smb2_setup_async_request,
4756         .check_receive = smb2_check_receive,
4757         .add_credits = smb2_add_credits,
4758         .set_credits = smb2_set_credits,
4759         .get_credits_field = smb2_get_credits_field,
4760         .get_credits = smb2_get_credits,
4761         .wait_mtu_credits = cifs_wait_mtu_credits,
4762         .get_next_mid = smb2_get_next_mid,
4763         .revert_current_mid = smb2_revert_current_mid,
4764         .read_data_offset = smb2_read_data_offset,
4765         .read_data_length = smb2_read_data_length,
4766         .map_error = map_smb2_to_linux_error,
4767         .find_mid = smb2_find_mid,
4768         .check_message = smb2_check_message,
4769         .dump_detail = smb2_dump_detail,
4770         .clear_stats = smb2_clear_stats,
4771         .print_stats = smb2_print_stats,
4772         .is_oplock_break = smb2_is_valid_oplock_break,
4773         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4774         .downgrade_oplock = smb2_downgrade_oplock,
4775         .need_neg = smb2_need_neg,
4776         .negotiate = smb2_negotiate,
4777         .negotiate_wsize = smb2_negotiate_wsize,
4778         .negotiate_rsize = smb2_negotiate_rsize,
4779         .sess_setup = SMB2_sess_setup,
4780         .logoff = SMB2_logoff,
4781         .tree_connect = SMB2_tcon,
4782         .tree_disconnect = SMB2_tdis,
4783         .qfs_tcon = smb2_qfs_tcon,
4784         .is_path_accessible = smb2_is_path_accessible,
4785         .can_echo = smb2_can_echo,
4786         .echo = SMB2_echo,
4787         .query_path_info = smb2_query_path_info,
4788         .get_srv_inum = smb2_get_srv_inum,
4789         .query_file_info = smb2_query_file_info,
4790         .set_path_size = smb2_set_path_size,
4791         .set_file_size = smb2_set_file_size,
4792         .set_file_info = smb2_set_file_info,
4793         .set_compression = smb2_set_compression,
4794         .mkdir = smb2_mkdir,
4795         .mkdir_setinfo = smb2_mkdir_setinfo,
4796         .rmdir = smb2_rmdir,
4797         .unlink = smb2_unlink,
4798         .rename = smb2_rename_path,
4799         .create_hardlink = smb2_create_hardlink,
4800         .query_symlink = smb2_query_symlink,
4801         .query_mf_symlink = smb3_query_mf_symlink,
4802         .create_mf_symlink = smb3_create_mf_symlink,
4803         .open = smb2_open_file,
4804         .set_fid = smb2_set_fid,
4805         .close = smb2_close_file,
4806         .flush = smb2_flush_file,
4807         .async_readv = smb2_async_readv,
4808         .async_writev = smb2_async_writev,
4809         .sync_read = smb2_sync_read,
4810         .sync_write = smb2_sync_write,
4811         .query_dir_first = smb2_query_dir_first,
4812         .query_dir_next = smb2_query_dir_next,
4813         .close_dir = smb2_close_dir,
4814         .calc_smb_size = smb2_calc_size,
4815         .is_status_pending = smb2_is_status_pending,
4816         .is_session_expired = smb2_is_session_expired,
4817         .oplock_response = smb2_oplock_response,
4818         .queryfs = smb2_queryfs,
4819         .mand_lock = smb2_mand_lock,
4820         .mand_unlock_range = smb2_unlock_range,
4821         .push_mand_locks = smb2_push_mandatory_locks,
4822         .get_lease_key = smb2_get_lease_key,
4823         .set_lease_key = smb2_set_lease_key,
4824         .new_lease_key = smb2_new_lease_key,
4825         .calc_signature = smb2_calc_signature,
4826         .is_read_op = smb2_is_read_op,
4827         .set_oplock_level = smb2_set_oplock_level,
4828         .create_lease_buf = smb2_create_lease_buf,
4829         .parse_lease_buf = smb2_parse_lease_buf,
4830         .copychunk_range = smb2_copychunk_range,
4831         .wp_retry_size = smb2_wp_retry_size,
4832         .dir_needs_close = smb2_dir_needs_close,
4833         .get_dfs_refer = smb2_get_dfs_refer,
4834         .select_sectype = smb2_select_sectype,
4835 #ifdef CONFIG_CIFS_XATTR
4836         .query_all_EAs = smb2_query_eas,
4837         .set_EA = smb2_set_ea,
4838 #endif /* CIFS_XATTR */
4839         .get_acl = get_smb2_acl,
4840         .get_acl_by_fid = get_smb2_acl_by_fid,
4841         .set_acl = set_smb2_acl,
4842         .next_header = smb2_next_header,
4843         .ioctl_query_info = smb2_ioctl_query_info,
4844         .make_node = smb2_make_node,
4845         .fiemap = smb3_fiemap,
4846         .llseek = smb3_llseek,
4847         .is_status_io_timeout = smb2_is_status_io_timeout,
4848 };
4849
4850 struct smb_version_operations smb21_operations = {
4851         .compare_fids = smb2_compare_fids,
4852         .setup_request = smb2_setup_request,
4853         .setup_async_request = smb2_setup_async_request,
4854         .check_receive = smb2_check_receive,
4855         .add_credits = smb2_add_credits,
4856         .set_credits = smb2_set_credits,
4857         .get_credits_field = smb2_get_credits_field,
4858         .get_credits = smb2_get_credits,
4859         .wait_mtu_credits = smb2_wait_mtu_credits,
4860         .adjust_credits = smb2_adjust_credits,
4861         .get_next_mid = smb2_get_next_mid,
4862         .revert_current_mid = smb2_revert_current_mid,
4863         .read_data_offset = smb2_read_data_offset,
4864         .read_data_length = smb2_read_data_length,
4865         .map_error = map_smb2_to_linux_error,
4866         .find_mid = smb2_find_mid,
4867         .check_message = smb2_check_message,
4868         .dump_detail = smb2_dump_detail,
4869         .clear_stats = smb2_clear_stats,
4870         .print_stats = smb2_print_stats,
4871         .is_oplock_break = smb2_is_valid_oplock_break,
4872         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4873         .downgrade_oplock = smb2_downgrade_oplock,
4874         .need_neg = smb2_need_neg,
4875         .negotiate = smb2_negotiate,
4876         .negotiate_wsize = smb2_negotiate_wsize,
4877         .negotiate_rsize = smb2_negotiate_rsize,
4878         .sess_setup = SMB2_sess_setup,
4879         .logoff = SMB2_logoff,
4880         .tree_connect = SMB2_tcon,
4881         .tree_disconnect = SMB2_tdis,
4882         .qfs_tcon = smb2_qfs_tcon,
4883         .is_path_accessible = smb2_is_path_accessible,
4884         .can_echo = smb2_can_echo,
4885         .echo = SMB2_echo,
4886         .query_path_info = smb2_query_path_info,
4887         .get_srv_inum = smb2_get_srv_inum,
4888         .query_file_info = smb2_query_file_info,
4889         .set_path_size = smb2_set_path_size,
4890         .set_file_size = smb2_set_file_size,
4891         .set_file_info = smb2_set_file_info,
4892         .set_compression = smb2_set_compression,
4893         .mkdir = smb2_mkdir,
4894         .mkdir_setinfo = smb2_mkdir_setinfo,
4895         .rmdir = smb2_rmdir,
4896         .unlink = smb2_unlink,
4897         .rename = smb2_rename_path,
4898         .create_hardlink = smb2_create_hardlink,
4899         .query_symlink = smb2_query_symlink,
4900         .query_mf_symlink = smb3_query_mf_symlink,
4901         .create_mf_symlink = smb3_create_mf_symlink,
4902         .open = smb2_open_file,
4903         .set_fid = smb2_set_fid,
4904         .close = smb2_close_file,
4905         .flush = smb2_flush_file,
4906         .async_readv = smb2_async_readv,
4907         .async_writev = smb2_async_writev,
4908         .sync_read = smb2_sync_read,
4909         .sync_write = smb2_sync_write,
4910         .query_dir_first = smb2_query_dir_first,
4911         .query_dir_next = smb2_query_dir_next,
4912         .close_dir = smb2_close_dir,
4913         .calc_smb_size = smb2_calc_size,
4914         .is_status_pending = smb2_is_status_pending,
4915         .is_session_expired = smb2_is_session_expired,
4916         .oplock_response = smb2_oplock_response,
4917         .queryfs = smb2_queryfs,
4918         .mand_lock = smb2_mand_lock,
4919         .mand_unlock_range = smb2_unlock_range,
4920         .push_mand_locks = smb2_push_mandatory_locks,
4921         .get_lease_key = smb2_get_lease_key,
4922         .set_lease_key = smb2_set_lease_key,
4923         .new_lease_key = smb2_new_lease_key,
4924         .calc_signature = smb2_calc_signature,
4925         .is_read_op = smb21_is_read_op,
4926         .set_oplock_level = smb21_set_oplock_level,
4927         .create_lease_buf = smb2_create_lease_buf,
4928         .parse_lease_buf = smb2_parse_lease_buf,
4929         .copychunk_range = smb2_copychunk_range,
4930         .wp_retry_size = smb2_wp_retry_size,
4931         .dir_needs_close = smb2_dir_needs_close,
4932         .enum_snapshots = smb3_enum_snapshots,
4933         .notify = smb3_notify,
4934         .get_dfs_refer = smb2_get_dfs_refer,
4935         .select_sectype = smb2_select_sectype,
4936 #ifdef CONFIG_CIFS_XATTR
4937         .query_all_EAs = smb2_query_eas,
4938         .set_EA = smb2_set_ea,
4939 #endif /* CIFS_XATTR */
4940         .get_acl = get_smb2_acl,
4941         .get_acl_by_fid = get_smb2_acl_by_fid,
4942         .set_acl = set_smb2_acl,
4943         .next_header = smb2_next_header,
4944         .ioctl_query_info = smb2_ioctl_query_info,
4945         .make_node = smb2_make_node,
4946         .fiemap = smb3_fiemap,
4947         .llseek = smb3_llseek,
4948         .is_status_io_timeout = smb2_is_status_io_timeout,
4949 };
4950
4951 struct smb_version_operations smb30_operations = {
4952         .compare_fids = smb2_compare_fids,
4953         .setup_request = smb2_setup_request,
4954         .setup_async_request = smb2_setup_async_request,
4955         .check_receive = smb2_check_receive,
4956         .add_credits = smb2_add_credits,
4957         .set_credits = smb2_set_credits,
4958         .get_credits_field = smb2_get_credits_field,
4959         .get_credits = smb2_get_credits,
4960         .wait_mtu_credits = smb2_wait_mtu_credits,
4961         .adjust_credits = smb2_adjust_credits,
4962         .get_next_mid = smb2_get_next_mid,
4963         .revert_current_mid = smb2_revert_current_mid,
4964         .read_data_offset = smb2_read_data_offset,
4965         .read_data_length = smb2_read_data_length,
4966         .map_error = map_smb2_to_linux_error,
4967         .find_mid = smb2_find_mid,
4968         .check_message = smb2_check_message,
4969         .dump_detail = smb2_dump_detail,
4970         .clear_stats = smb2_clear_stats,
4971         .print_stats = smb2_print_stats,
4972         .dump_share_caps = smb2_dump_share_caps,
4973         .is_oplock_break = smb2_is_valid_oplock_break,
4974         .handle_cancelled_mid = smb2_handle_cancelled_mid,
4975         .downgrade_oplock = smb3_downgrade_oplock,
4976         .need_neg = smb2_need_neg,
4977         .negotiate = smb2_negotiate,
4978         .negotiate_wsize = smb3_negotiate_wsize,
4979         .negotiate_rsize = smb3_negotiate_rsize,
4980         .sess_setup = SMB2_sess_setup,
4981         .logoff = SMB2_logoff,
4982         .tree_connect = SMB2_tcon,
4983         .tree_disconnect = SMB2_tdis,
4984         .qfs_tcon = smb3_qfs_tcon,
4985         .is_path_accessible = smb2_is_path_accessible,
4986         .can_echo = smb2_can_echo,
4987         .echo = SMB2_echo,
4988         .query_path_info = smb2_query_path_info,
4989         .get_srv_inum = smb2_get_srv_inum,
4990         .query_file_info = smb2_query_file_info,
4991         .set_path_size = smb2_set_path_size,
4992         .set_file_size = smb2_set_file_size,
4993         .set_file_info = smb2_set_file_info,
4994         .set_compression = smb2_set_compression,
4995         .mkdir = smb2_mkdir,
4996         .mkdir_setinfo = smb2_mkdir_setinfo,
4997         .rmdir = smb2_rmdir,
4998         .unlink = smb2_unlink,
4999         .rename = smb2_rename_path,
5000         .create_hardlink = smb2_create_hardlink,
5001         .query_symlink = smb2_query_symlink,
5002         .query_mf_symlink = smb3_query_mf_symlink,
5003         .create_mf_symlink = smb3_create_mf_symlink,
5004         .open = smb2_open_file,
5005         .set_fid = smb2_set_fid,
5006         .close = smb2_close_file,
5007         .close_getattr = smb2_close_getattr,
5008         .flush = smb2_flush_file,
5009         .async_readv = smb2_async_readv,
5010         .async_writev = smb2_async_writev,
5011         .sync_read = smb2_sync_read,
5012         .sync_write = smb2_sync_write,
5013         .query_dir_first = smb2_query_dir_first,
5014         .query_dir_next = smb2_query_dir_next,
5015         .close_dir = smb2_close_dir,
5016         .calc_smb_size = smb2_calc_size,
5017         .is_status_pending = smb2_is_status_pending,
5018         .is_session_expired = smb2_is_session_expired,
5019         .oplock_response = smb2_oplock_response,
5020         .queryfs = smb2_queryfs,
5021         .mand_lock = smb2_mand_lock,
5022         .mand_unlock_range = smb2_unlock_range,
5023         .push_mand_locks = smb2_push_mandatory_locks,
5024         .get_lease_key = smb2_get_lease_key,
5025         .set_lease_key = smb2_set_lease_key,
5026         .new_lease_key = smb2_new_lease_key,
5027         .generate_signingkey = generate_smb30signingkey,
5028         .calc_signature = smb3_calc_signature,
5029         .set_integrity  = smb3_set_integrity,
5030         .is_read_op = smb21_is_read_op,
5031         .set_oplock_level = smb3_set_oplock_level,
5032         .create_lease_buf = smb3_create_lease_buf,
5033         .parse_lease_buf = smb3_parse_lease_buf,
5034         .copychunk_range = smb2_copychunk_range,
5035         .duplicate_extents = smb2_duplicate_extents,
5036         .validate_negotiate = smb3_validate_negotiate,
5037         .wp_retry_size = smb2_wp_retry_size,
5038         .dir_needs_close = smb2_dir_needs_close,
5039         .fallocate = smb3_fallocate,
5040         .enum_snapshots = smb3_enum_snapshots,
5041         .notify = smb3_notify,
5042         .init_transform_rq = smb3_init_transform_rq,
5043         .is_transform_hdr = smb3_is_transform_hdr,
5044         .receive_transform = smb3_receive_transform,
5045         .get_dfs_refer = smb2_get_dfs_refer,
5046         .select_sectype = smb2_select_sectype,
5047 #ifdef CONFIG_CIFS_XATTR
5048         .query_all_EAs = smb2_query_eas,
5049         .set_EA = smb2_set_ea,
5050 #endif /* CIFS_XATTR */
5051         .get_acl = get_smb2_acl,
5052         .get_acl_by_fid = get_smb2_acl_by_fid,
5053         .set_acl = set_smb2_acl,
5054         .next_header = smb2_next_header,
5055         .ioctl_query_info = smb2_ioctl_query_info,
5056         .make_node = smb2_make_node,
5057         .fiemap = smb3_fiemap,
5058         .llseek = smb3_llseek,
5059         .is_status_io_timeout = smb2_is_status_io_timeout,
5060 };
5061
5062 struct smb_version_operations smb311_operations = {
5063         .compare_fids = smb2_compare_fids,
5064         .setup_request = smb2_setup_request,
5065         .setup_async_request = smb2_setup_async_request,
5066         .check_receive = smb2_check_receive,
5067         .add_credits = smb2_add_credits,
5068         .set_credits = smb2_set_credits,
5069         .get_credits_field = smb2_get_credits_field,
5070         .get_credits = smb2_get_credits,
5071         .wait_mtu_credits = smb2_wait_mtu_credits,
5072         .adjust_credits = smb2_adjust_credits,
5073         .get_next_mid = smb2_get_next_mid,
5074         .revert_current_mid = smb2_revert_current_mid,
5075         .read_data_offset = smb2_read_data_offset,
5076         .read_data_length = smb2_read_data_length,
5077         .map_error = map_smb2_to_linux_error,
5078         .find_mid = smb2_find_mid,
5079         .check_message = smb2_check_message,
5080         .dump_detail = smb2_dump_detail,
5081         .clear_stats = smb2_clear_stats,
5082         .print_stats = smb2_print_stats,
5083         .dump_share_caps = smb2_dump_share_caps,
5084         .is_oplock_break = smb2_is_valid_oplock_break,
5085         .handle_cancelled_mid = smb2_handle_cancelled_mid,
5086         .downgrade_oplock = smb3_downgrade_oplock,
5087         .need_neg = smb2_need_neg,
5088         .negotiate = smb2_negotiate,
5089         .negotiate_wsize = smb3_negotiate_wsize,
5090         .negotiate_rsize = smb3_negotiate_rsize,
5091         .sess_setup = SMB2_sess_setup,
5092         .logoff = SMB2_logoff,
5093         .tree_connect = SMB2_tcon,
5094         .tree_disconnect = SMB2_tdis,
5095         .qfs_tcon = smb3_qfs_tcon,
5096         .is_path_accessible = smb2_is_path_accessible,
5097         .can_echo = smb2_can_echo,
5098         .echo = SMB2_echo,
5099         .query_path_info = smb2_query_path_info,
5100         .get_srv_inum = smb2_get_srv_inum,
5101         .query_file_info = smb2_query_file_info,
5102         .set_path_size = smb2_set_path_size,
5103         .set_file_size = smb2_set_file_size,
5104         .set_file_info = smb2_set_file_info,
5105         .set_compression = smb2_set_compression,
5106         .mkdir = smb2_mkdir,
5107         .mkdir_setinfo = smb2_mkdir_setinfo,
5108         .posix_mkdir = smb311_posix_mkdir,
5109         .rmdir = smb2_rmdir,
5110         .unlink = smb2_unlink,
5111         .rename = smb2_rename_path,
5112         .create_hardlink = smb2_create_hardlink,
5113         .query_symlink = smb2_query_symlink,
5114         .query_mf_symlink = smb3_query_mf_symlink,
5115         .create_mf_symlink = smb3_create_mf_symlink,
5116         .open = smb2_open_file,
5117         .set_fid = smb2_set_fid,
5118         .close = smb2_close_file,
5119         .close_getattr = smb2_close_getattr,
5120         .flush = smb2_flush_file,
5121         .async_readv = smb2_async_readv,
5122         .async_writev = smb2_async_writev,
5123         .sync_read = smb2_sync_read,
5124         .sync_write = smb2_sync_write,
5125         .query_dir_first = smb2_query_dir_first,
5126         .query_dir_next = smb2_query_dir_next,
5127         .close_dir = smb2_close_dir,
5128         .calc_smb_size = smb2_calc_size,
5129         .is_status_pending = smb2_is_status_pending,
5130         .is_session_expired = smb2_is_session_expired,
5131         .oplock_response = smb2_oplock_response,
5132         .queryfs = smb311_queryfs,
5133         .mand_lock = smb2_mand_lock,
5134         .mand_unlock_range = smb2_unlock_range,
5135         .push_mand_locks = smb2_push_mandatory_locks,
5136         .get_lease_key = smb2_get_lease_key,
5137         .set_lease_key = smb2_set_lease_key,
5138         .new_lease_key = smb2_new_lease_key,
5139         .generate_signingkey = generate_smb311signingkey,
5140         .calc_signature = smb3_calc_signature,
5141         .set_integrity  = smb3_set_integrity,
5142         .is_read_op = smb21_is_read_op,
5143         .set_oplock_level = smb3_set_oplock_level,
5144         .create_lease_buf = smb3_create_lease_buf,
5145         .parse_lease_buf = smb3_parse_lease_buf,
5146         .copychunk_range = smb2_copychunk_range,
5147         .duplicate_extents = smb2_duplicate_extents,
5148 /*      .validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
5149         .wp_retry_size = smb2_wp_retry_size,
5150         .dir_needs_close = smb2_dir_needs_close,
5151         .fallocate = smb3_fallocate,
5152         .enum_snapshots = smb3_enum_snapshots,
5153         .notify = smb3_notify,
5154         .init_transform_rq = smb3_init_transform_rq,
5155         .is_transform_hdr = smb3_is_transform_hdr,
5156         .receive_transform = smb3_receive_transform,
5157         .get_dfs_refer = smb2_get_dfs_refer,
5158         .select_sectype = smb2_select_sectype,
5159 #ifdef CONFIG_CIFS_XATTR
5160         .query_all_EAs = smb2_query_eas,
5161         .set_EA = smb2_set_ea,
5162 #endif /* CIFS_XATTR */
5163         .get_acl = get_smb2_acl,
5164         .get_acl_by_fid = get_smb2_acl_by_fid,
5165         .set_acl = set_smb2_acl,
5166         .next_header = smb2_next_header,
5167         .ioctl_query_info = smb2_ioctl_query_info,
5168         .make_node = smb2_make_node,
5169         .fiemap = smb3_fiemap,
5170         .llseek = smb3_llseek,
5171         .is_status_io_timeout = smb2_is_status_io_timeout,
5172 };
5173
5174 struct smb_version_values smb20_values = {
5175         .version_string = SMB20_VERSION_STRING,
5176         .protocol_id = SMB20_PROT_ID,
5177         .req_capabilities = 0, /* MBZ */
5178         .large_lock_type = 0,
5179         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
5180         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
5181         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5182         .header_size = sizeof(struct smb2_sync_hdr),
5183         .header_preamble_size = 0,
5184         .max_header_size = MAX_SMB2_HDR_SIZE,
5185         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5186         .lock_cmd = SMB2_LOCK,
5187         .cap_unix = 0,
5188         .cap_nt_find = SMB2_NT_FIND,
5189         .cap_large_files = SMB2_LARGE_FILES,
5190         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5191         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5192         .create_lease_size = sizeof(struct create_lease),
5193 };
5194
5195 struct smb_version_values smb21_values = {
5196         .version_string = SMB21_VERSION_STRING,
5197         .protocol_id = SMB21_PROT_ID,
5198         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
5199         .large_lock_type = 0,
5200         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
5201         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
5202         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5203         .header_size = sizeof(struct smb2_sync_hdr),
5204         .header_preamble_size = 0,
5205         .max_header_size = MAX_SMB2_HDR_SIZE,
5206         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5207         .lock_cmd = SMB2_LOCK,
5208         .cap_unix = 0,
5209         .cap_nt_find = SMB2_NT_FIND,
5210         .cap_large_files = SMB2_LARGE_FILES,
5211         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5212         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5213         .create_lease_size = sizeof(struct create_lease),
5214 };
5215
5216 struct smb_version_values smb3any_values = {
5217         .version_string = SMB3ANY_VERSION_STRING,
5218         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
5219         .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,
5220         .large_lock_type = 0,
5221         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
5222         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
5223         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5224         .header_size = sizeof(struct smb2_sync_hdr),
5225         .header_preamble_size = 0,
5226         .max_header_size = MAX_SMB2_HDR_SIZE,
5227         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5228         .lock_cmd = SMB2_LOCK,
5229         .cap_unix = 0,
5230         .cap_nt_find = SMB2_NT_FIND,
5231         .cap_large_files = SMB2_LARGE_FILES,
5232         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5233         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5234         .create_lease_size = sizeof(struct create_lease_v2),
5235 };
5236
5237 struct smb_version_values smbdefault_values = {
5238         .version_string = SMBDEFAULT_VERSION_STRING,
5239         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
5240         .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,
5241         .large_lock_type = 0,
5242         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
5243         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
5244         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5245         .header_size = sizeof(struct smb2_sync_hdr),
5246         .header_preamble_size = 0,
5247         .max_header_size = MAX_SMB2_HDR_SIZE,
5248         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5249         .lock_cmd = SMB2_LOCK,
5250         .cap_unix = 0,
5251         .cap_nt_find = SMB2_NT_FIND,
5252         .cap_large_files = SMB2_LARGE_FILES,
5253         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5254         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5255         .create_lease_size = sizeof(struct create_lease_v2),
5256 };
5257
5258 struct smb_version_values smb30_values = {
5259         .version_string = SMB30_VERSION_STRING,
5260         .protocol_id = SMB30_PROT_ID,
5261         .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,
5262         .large_lock_type = 0,
5263         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
5264         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
5265         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5266         .header_size = sizeof(struct smb2_sync_hdr),
5267         .header_preamble_size = 0,
5268         .max_header_size = MAX_SMB2_HDR_SIZE,
5269         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5270         .lock_cmd = SMB2_LOCK,
5271         .cap_unix = 0,
5272         .cap_nt_find = SMB2_NT_FIND,
5273         .cap_large_files = SMB2_LARGE_FILES,
5274         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5275         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5276         .create_lease_size = sizeof(struct create_lease_v2),
5277 };
5278
5279 struct smb_version_values smb302_values = {
5280         .version_string = SMB302_VERSION_STRING,
5281         .protocol_id = SMB302_PROT_ID,
5282         .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,
5283         .large_lock_type = 0,
5284         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
5285         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
5286         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5287         .header_size = sizeof(struct smb2_sync_hdr),
5288         .header_preamble_size = 0,
5289         .max_header_size = MAX_SMB2_HDR_SIZE,
5290         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5291         .lock_cmd = SMB2_LOCK,
5292         .cap_unix = 0,
5293         .cap_nt_find = SMB2_NT_FIND,
5294         .cap_large_files = SMB2_LARGE_FILES,
5295         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5296         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5297         .create_lease_size = sizeof(struct create_lease_v2),
5298 };
5299
5300 struct smb_version_values smb311_values = {
5301         .version_string = SMB311_VERSION_STRING,
5302         .protocol_id = SMB311_PROT_ID,
5303         .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,
5304         .large_lock_type = 0,
5305         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
5306         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
5307         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
5308         .header_size = sizeof(struct smb2_sync_hdr),
5309         .header_preamble_size = 0,
5310         .max_header_size = MAX_SMB2_HDR_SIZE,
5311         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
5312         .lock_cmd = SMB2_LOCK,
5313         .cap_unix = 0,
5314         .cap_nt_find = SMB2_NT_FIND,
5315         .cap_large_files = SMB2_LARGE_FILES,
5316         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
5317         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
5318         .create_lease_size = sizeof(struct create_lease_v2),
5319 };