fs/cifs/smb2ops.c

   1 /*
   2  *  SMB2 version specific operations
   3  *
   4  *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
   5  *
   6  *  This library is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License v2 as published
   8  *  by the Free Software Foundation.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *  the GNU Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public License
  16  *  along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <linux/pagemap.h>
  21 #include <linux/vfs.h>
  22 #include <linux/falloc.h>
  23 #include <linux/scatterlist.h>
  24 #include <linux/uuid.h>
  25 #include <crypto/aead.h>
  26 #include "cifsglob.h"
  27 #include "smb2pdu.h"
  28 #include "smb2proto.h"
  29 #include "cifsproto.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_unicode.h"
  32 #include "smb2status.h"
  33 #include "smb2glob.h"
  34 #include "cifs_ioctl.h"
  35
  36 static int
  37 change_conf(struct TCP_Server_Info *server)
  38 {
  39         server->credits += server->echo_credits + server->oplock_credits;
  40         server->oplock_credits = server->echo_credits = 0;
  41         switch (server->credits) {
  42         case 0:
  43                 return -1;
  44         case 1:
  45                 server->echoes = false;
  46                 server->oplocks = false;
  47                 cifs_dbg(VFS, "disabling echoes and oplocks\n");
  48                 break;
  49         case 2:
  50                 server->echoes = true;
  51                 server->oplocks = false;
  52                 server->echo_credits = 1;
  53                 cifs_dbg(FYI, "disabling oplocks\n");
  54                 break;
  55         default:
  56                 server->echoes = true;
  57                 if (enable_oplocks) {
  58                         server->oplocks = true;
  59                         server->oplock_credits = 1;
  60                 } else
  61                         server->oplocks = false;
  62
  63                 server->echo_credits = 1;
  64         }
  65         server->credits -= server->echo_credits + server->oplock_credits;
  66         return 0;
  67 }
  68
  69 static void
  70 smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
  71                  const int optype)
  72 {
  73         int *val, rc = 0;
  74         spin_lock(&server->req_lock);
  75         val = server->ops->get_credits_field(server, optype);
  76         *val += add;
  77         if (*val > 65000) {
  78                 *val = 65000; /* Don't get near 64K credits, avoid srv bugs */
  79                 printk_once(KERN_WARNING "server overflowed SMB3 credits\n");
  80         }
  81         server->in_flight--;
  82         if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
  83                 rc = change_conf(server);
  84         /*
  85          * Sometimes server returns 0 credits on oplock break ack - we need to
  86          * rebalance credits in this case.
  87          */
  88         else if (server->in_flight > 0 && server->oplock_credits == 0 &&
  89                  server->oplocks) {
  90                 if (server->credits > 1) {
  91                         server->credits--;
  92                         server->oplock_credits++;
  93                 }
  94         }
  95         spin_unlock(&server->req_lock);
  96         wake_up(&server->request_q);
  97         if (rc)
  98                 cifs_reconnect(server);
  99 }
 100
 101 static void
 102 smb2_set_credits(struct TCP_Server_Info *server, const int val)
 103 {
 104         spin_lock(&server->req_lock);
 105         server->credits = val;
 106         spin_unlock(&server->req_lock);
 107 }
 108
 109 static int *
 110 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
 111 {
 112         switch (optype) {
 113         case CIFS_ECHO_OP:
 114                 return &server->echo_credits;
 115         case CIFS_OBREAK_OP:
 116                 return &server->oplock_credits;
 117         default:
 118                 return &server->credits;
 119         }
 120 }
 121
 122 static unsigned int
 123 smb2_get_credits(struct mid_q_entry *mid)
 124 {
 125         struct smb2_sync_hdr *shdr = get_sync_hdr(mid->resp_buf);
 126
 127         return le16_to_cpu(shdr->CreditRequest);
 128 }
 129
 130 static int
 131 smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
 132                       unsigned int *num, unsigned int *credits)
 133 {
 134         int rc = 0;
 135         unsigned int scredits;
 136
 137         spin_lock(&server->req_lock);
 138         while (1) {
 139                 if (server->credits <= 0) {
 140                         spin_unlock(&server->req_lock);
 141                         cifs_num_waiters_inc(server);
 142                         rc = wait_event_killable(server->request_q,
 143                                         has_credits(server, &server->credits));
 144                         cifs_num_waiters_dec(server);
 145                         if (rc)
 146                                 return rc;
 147                         spin_lock(&server->req_lock);
 148                 } else {
 149                         if (server->tcpStatus == CifsExiting) {
 150                                 spin_unlock(&server->req_lock);
 151                                 return -ENOENT;
 152                         }
 153
 154                         scredits = server->credits;
 155                         /* can deadlock with reopen */
 156                         if (scredits == 1) {
 157                                 *num = SMB2_MAX_BUFFER_SIZE;
 158                                 *credits = 0;
 159                                 break;
 160                         }
 161
 162                         /* leave one credit for a possible reopen */
 163                         scredits--;
 164                         *num = min_t(unsigned int, size,
 165                                      scredits * SMB2_MAX_BUFFER_SIZE);
 166
 167                         *credits = DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
 168                         server->credits -= *credits;
 169                         server->in_flight++;
 170                         break;
 171                 }
 172         }
 173         spin_unlock(&server->req_lock);
 174         return rc;
 175 }
 176
 177 static __u64
 178 smb2_get_next_mid(struct TCP_Server_Info *server)
 179 {
 180         __u64 mid;
 181         /* for SMB2 we need the current value */
 182         spin_lock(&GlobalMid_Lock);
 183         mid = server->CurrentMid++;
 184         spin_unlock(&GlobalMid_Lock);
 185         return mid;
 186 }
 187
 188 static struct mid_q_entry *
 189 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
 190 {
 191         struct mid_q_entry *mid;
 192         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
 193         __u64 wire_mid = le64_to_cpu(shdr->MessageId);
 194
 195         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 196                 cifs_dbg(VFS, "encrypted frame parsing not supported yet");
 197                 return NULL;
 198         }
 199
 200         spin_lock(&GlobalMid_Lock);
 201         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 202                 if ((mid->mid == wire_mid) &&
 203                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
 204                     (mid->command == shdr->Command)) {
 205                         spin_unlock(&GlobalMid_Lock);
 206                         return mid;
 207                 }
 208         }
 209         spin_unlock(&GlobalMid_Lock);
 210         return NULL;
 211 }
 212
 213 static void
 214 smb2_dump_detail(void *buf)
 215 {
 216 #ifdef CONFIG_CIFS_DEBUG2
 217         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
 218
 219         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
 220                  shdr->Command, shdr->Status, shdr->Flags, shdr->MessageId,
 221                  shdr->ProcessId);
 222         cifs_dbg(VFS, "smb buf %p len %u\n", buf, smb2_calc_size(buf));
 223 #endif
 224 }
 225
 226 static bool
 227 smb2_need_neg(struct TCP_Server_Info *server)
 228 {
 229         return server->max_read == 0;
 230 }
 231
 232 static int
 233 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 234 {
 235         int rc;
 236         ses->server->CurrentMid = 0;
 237         rc = SMB2_negotiate(xid, ses);
 238         /* BB we probably don't need to retry with modern servers */
 239         if (rc == -EAGAIN)
 240                 rc = -EHOSTDOWN;
 241         return rc;
 242 }
 243
 244 static unsigned int
 245 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 246 {
 247         struct TCP_Server_Info *server = tcon->ses->server;
 248         unsigned int wsize;
 249
 250         /* start with specified wsize, or default */
 251         wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
 252         wsize = min_t(unsigned int, wsize, server->max_write);
 253
 254         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 255                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 256
 257         return wsize;
 258 }
 259
 260 static unsigned int
 261 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 262 {
 263         struct TCP_Server_Info *server = tcon->ses->server;
 264         unsigned int rsize;
 265
 266         /* start with specified rsize, or default */
 267         rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
 268         rsize = min_t(unsigned int, rsize, server->max_read);
 269
 270         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 271                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 272
 273         return rsize;
 274 }
 275
 276 #ifdef CONFIG_CIFS_STATS2
 277 static int
 278 SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
 279 {
 280         int rc;
 281         unsigned int ret_data_len = 0;
 282         struct network_interface_info_ioctl_rsp *out_buf;
 283
 284         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 285                         FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
 286                         false /* use_ipc */,
 287                         NULL /* no data input */, 0 /* no data input */,
 288                         (char **)&out_buf, &ret_data_len);
 289         if (rc != 0)
 290                 cifs_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
 291         else if (ret_data_len < sizeof(struct network_interface_info_ioctl_rsp)) {
 292                 cifs_dbg(VFS, "server returned bad net interface info buf\n");
 293                 rc = -EINVAL;
 294         } else {
 295                 /* Dump info on first interface */
 296                 cifs_dbg(FYI, "Adapter Capability 0x%x\t",
 297                         le32_to_cpu(out_buf->Capability));
 298                 cifs_dbg(FYI, "Link Speed %lld\n",
 299                         le64_to_cpu(out_buf->LinkSpeed));
 300         }
 301         kfree(out_buf);
 302         return rc;
 303 }
 304 #endif /* STATS2 */
 305
 306 static void
 307 smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 308 {
 309         int rc;
 310         __le16 srch_path = 0; /* Null - open root of share */
 311         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 312         struct cifs_open_parms oparms;
 313         struct cifs_fid fid;
 314
 315         oparms.tcon = tcon;
 316         oparms.desired_access = FILE_READ_ATTRIBUTES;
 317         oparms.disposition = FILE_OPEN;
 318         oparms.create_options = 0;
 319         oparms.fid = &fid;
 320         oparms.reconnect = false;
 321
 322         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
 323         if (rc)
 324                 return;
 325
 326 #ifdef CONFIG_CIFS_STATS2
 327         SMB3_request_interfaces(xid, tcon);
 328 #endif /* STATS2 */
 329
 330         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 331                         FS_ATTRIBUTE_INFORMATION);
 332         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 333                         FS_DEVICE_INFORMATION);
 334         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 335                         FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
 336         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 337         return;
 338 }
 339
 340 static void
 341 smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 342 {
 343         int rc;
 344         __le16 srch_path = 0; /* Null - open root of share */
 345         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 346         struct cifs_open_parms oparms;
 347         struct cifs_fid fid;
 348
 349         oparms.tcon = tcon;
 350         oparms.desired_access = FILE_READ_ATTRIBUTES;
 351         oparms.disposition = FILE_OPEN;
 352         oparms.create_options = 0;
 353         oparms.fid = &fid;
 354         oparms.reconnect = false;
 355
 356         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
 357         if (rc)
 358                 return;
 359
 360         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 361                         FS_ATTRIBUTE_INFORMATION);
 362         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 363                         FS_DEVICE_INFORMATION);
 364         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 365         return;
 366 }
 367
 368 static int
 369 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 370                         struct cifs_sb_info *cifs_sb, const char *full_path)
 371 {
 372         int rc;
 373         __le16 *utf16_path;
 374         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 375         struct cifs_open_parms oparms;
 376         struct cifs_fid fid;
 377
 378         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 379         if (!utf16_path)
 380                 return -ENOMEM;
 381
 382         oparms.tcon = tcon;
 383         oparms.desired_access = FILE_READ_ATTRIBUTES;
 384         oparms.disposition = FILE_OPEN;
 385         oparms.create_options = 0;
 386         oparms.fid = &fid;
 387         oparms.reconnect = false;
 388
 389         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 390         if (rc) {
 391                 kfree(utf16_path);
 392                 return rc;
 393         }
 394
 395         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 396         kfree(utf16_path);
 397         return rc;
 398 }
 399
 400 static int
 401 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 402                   struct cifs_sb_info *cifs_sb, const char *full_path,
 403                   u64 *uniqueid, FILE_ALL_INFO *data)
 404 {
 405         *uniqueid = le64_to_cpu(data->IndexNumber);
 406         return 0;
 407 }
 408
 409 static int
 410 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 411                      struct cifs_fid *fid, FILE_ALL_INFO *data)
 412 {
 413         int rc;
 414         struct smb2_file_all_info *smb2_data;
 415
 416         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 417                             GFP_KERNEL);
 418         if (smb2_data == NULL)
 419                 return -ENOMEM;
 420
 421         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
 422                              smb2_data);
 423         if (!rc)
 424                 move_smb2_info_to_cifs(data, smb2_data);
 425         kfree(smb2_data);
 426         return rc;
 427 }
 428
 429 static bool
 430 smb2_can_echo(struct TCP_Server_Info *server)
 431 {
 432         return server->echoes;
 433 }
 434
 435 static void
 436 smb2_clear_stats(struct cifs_tcon *tcon)
 437 {
 438 #ifdef CONFIG_CIFS_STATS
 439         int i;
 440         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
 441                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
 442                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
 443         }
 444 #endif
 445 }
 446
 447 static void
 448 smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
 449 {
 450         seq_puts(m, "\n\tShare Capabilities:");
 451         if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
 452                 seq_puts(m, " DFS,");
 453         if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
 454                 seq_puts(m, " CONTINUOUS AVAILABILITY,");
 455         if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
 456                 seq_puts(m, " SCALEOUT,");
 457         if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
 458                 seq_puts(m, " CLUSTER,");
 459         if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
 460                 seq_puts(m, " ASYMMETRIC,");
 461         if (tcon->capabilities == 0)
 462                 seq_puts(m, " None");
 463         if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
 464                 seq_puts(m, " Aligned,");
 465         if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
 466                 seq_puts(m, " Partition Aligned,");
 467         if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
 468                 seq_puts(m, " SSD,");
 469         if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
 470                 seq_puts(m, " TRIM-support,");
 471
 472         seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
 473         if (tcon->perf_sector_size)
 474                 seq_printf(m, "\tOptimal sector size: 0x%x",
 475                            tcon->perf_sector_size);
 476 }
 477
 478 static void
 479 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
 480 {
 481 #ifdef CONFIG_CIFS_STATS
 482         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
 483         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
 484         seq_printf(m, "\nNegotiates: %d sent %d failed",
 485                    atomic_read(&sent[SMB2_NEGOTIATE_HE]),
 486                    atomic_read(&failed[SMB2_NEGOTIATE_HE]));
 487         seq_printf(m, "\nSessionSetups: %d sent %d failed",
 488                    atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
 489                    atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
 490         seq_printf(m, "\nLogoffs: %d sent %d failed",
 491                    atomic_read(&sent[SMB2_LOGOFF_HE]),
 492                    atomic_read(&failed[SMB2_LOGOFF_HE]));
 493         seq_printf(m, "\nTreeConnects: %d sent %d failed",
 494                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
 495                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
 496         seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
 497                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
 498                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
 499         seq_printf(m, "\nCreates: %d sent %d failed",
 500                    atomic_read(&sent[SMB2_CREATE_HE]),
 501                    atomic_read(&failed[SMB2_CREATE_HE]));
 502         seq_printf(m, "\nCloses: %d sent %d failed",
 503                    atomic_read(&sent[SMB2_CLOSE_HE]),
 504                    atomic_read(&failed[SMB2_CLOSE_HE]));
 505         seq_printf(m, "\nFlushes: %d sent %d failed",
 506                    atomic_read(&sent[SMB2_FLUSH_HE]),
 507                    atomic_read(&failed[SMB2_FLUSH_HE]));
 508         seq_printf(m, "\nReads: %d sent %d failed",
 509                    atomic_read(&sent[SMB2_READ_HE]),
 510                    atomic_read(&failed[SMB2_READ_HE]));
 511         seq_printf(m, "\nWrites: %d sent %d failed",
 512                    atomic_read(&sent[SMB2_WRITE_HE]),
 513                    atomic_read(&failed[SMB2_WRITE_HE]));
 514         seq_printf(m, "\nLocks: %d sent %d failed",
 515                    atomic_read(&sent[SMB2_LOCK_HE]),
 516                    atomic_read(&failed[SMB2_LOCK_HE]));
 517         seq_printf(m, "\nIOCTLs: %d sent %d failed",
 518                    atomic_read(&sent[SMB2_IOCTL_HE]),
 519                    atomic_read(&failed[SMB2_IOCTL_HE]));
 520         seq_printf(m, "\nCancels: %d sent %d failed",
 521                    atomic_read(&sent[SMB2_CANCEL_HE]),
 522                    atomic_read(&failed[SMB2_CANCEL_HE]));
 523         seq_printf(m, "\nEchos: %d sent %d failed",
 524                    atomic_read(&sent[SMB2_ECHO_HE]),
 525                    atomic_read(&failed[SMB2_ECHO_HE]));
 526         seq_printf(m, "\nQueryDirectories: %d sent %d failed",
 527                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
 528                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
 529         seq_printf(m, "\nChangeNotifies: %d sent %d failed",
 530                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
 531                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
 532         seq_printf(m, "\nQueryInfos: %d sent %d failed",
 533                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
 534                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
 535         seq_printf(m, "\nSetInfos: %d sent %d failed",
 536                    atomic_read(&sent[SMB2_SET_INFO_HE]),
 537                    atomic_read(&failed[SMB2_SET_INFO_HE]));
 538         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
 539                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
 540                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
 541 #endif
 542 }
 543
 544 static void
 545 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
 546 {
 547         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
 548         struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
 549
 550         cfile->fid.persistent_fid = fid->persistent_fid;
 551         cfile->fid.volatile_fid = fid->volatile_fid;
 552         server->ops->set_oplock_level(cinode, oplock, fid->epoch,
 553                                       &fid->purge_cache);
 554         cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
 555         memcpy(cfile->fid.create_guid, fid->create_guid, 16);
 556 }
 557
 558 static void
 559 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
 560                 struct cifs_fid *fid)
 561 {
 562         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 563 }
 564
 565 static int
 566 SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
 567                      u64 persistent_fid, u64 volatile_fid,
 568                      struct copychunk_ioctl *pcchunk)
 569 {
 570         int rc;
 571         unsigned int ret_data_len;
 572         struct resume_key_req *res_key;
 573
 574         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
 575                         FSCTL_SRV_REQUEST_RESUME_KEY, true /* is_fsctl */,
 576                         false /* use_ipc */,
 577                         NULL, 0 /* no input */,
 578                         (char **)&res_key, &ret_data_len);
 579
 580         if (rc) {
 581                 cifs_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
 582                 goto req_res_key_exit;
 583         }
 584         if (ret_data_len < sizeof(struct resume_key_req)) {
 585                 cifs_dbg(VFS, "Invalid refcopy resume key length\n");
 586                 rc = -EINVAL;
 587                 goto req_res_key_exit;
 588         }
 589         memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
 590
 591 req_res_key_exit:
 592         kfree(res_key);
 593         return rc;
 594 }
 595
 596 static ssize_t
 597 smb2_copychunk_range(const unsigned int xid,
 598                         struct cifsFileInfo *srcfile,
 599                         struct cifsFileInfo *trgtfile, u64 src_off,
 600                         u64 len, u64 dest_off)
 601 {
 602         int rc;
 603         unsigned int ret_data_len;
 604         struct copychunk_ioctl *pcchunk;
 605         struct copychunk_ioctl_rsp *retbuf = NULL;
 606         struct cifs_tcon *tcon;
 607         int chunks_copied = 0;
 608         bool chunk_sizes_updated = false;
 609         ssize_t bytes_written, total_bytes_written = 0;
 610
 611         pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
 612
 613         if (pcchunk == NULL)
 614                 return -ENOMEM;
 615
 616         cifs_dbg(FYI, "in smb2_copychunk_range - about to call request res key\n");
 617         /* Request a key from the server to identify the source of the copy */
 618         rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
 619                                 srcfile->fid.persistent_fid,
 620                                 srcfile->fid.volatile_fid, pcchunk);
 621
 622         /* Note: request_res_key sets res_key null only if rc !=0 */
 623         if (rc)
 624                 goto cchunk_out;
 625
 626         /* For now array only one chunk long, will make more flexible later */
 627         pcchunk->ChunkCount = cpu_to_le32(1);
 628         pcchunk->Reserved = 0;
 629         pcchunk->Reserved2 = 0;
 630
 631         tcon = tlink_tcon(trgtfile->tlink);
 632
 633         while (len > 0) {
 634                 pcchunk->SourceOffset = cpu_to_le64(src_off);
 635                 pcchunk->TargetOffset = cpu_to_le64(dest_off);
 636                 pcchunk->Length =
 637                         cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));
 638
 639                 /* Request server copy to target from src identified by key */
 640                 rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
 641                         trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
 642                         true /* is_fsctl */, false /* use_ipc */,
 643                         (char *)pcchunk,
 644                         sizeof(struct copychunk_ioctl), (char **)&retbuf,
 645                         &ret_data_len);
 646                 if (rc == 0) {
 647                         if (ret_data_len !=
 648                                         sizeof(struct copychunk_ioctl_rsp)) {
 649                                 cifs_dbg(VFS, "invalid cchunk response size\n");
 650                                 rc = -EIO;
 651                                 goto cchunk_out;
 652                         }
 653                         if (retbuf->TotalBytesWritten == 0) {
 654                                 cifs_dbg(FYI, "no bytes copied\n");
 655                                 rc = -EIO;
 656                                 goto cchunk_out;
 657                         }
 658                         /*
 659                          * Check if server claimed to write more than we asked
 660                          */
 661                         if (le32_to_cpu(retbuf->TotalBytesWritten) >
 662                             le32_to_cpu(pcchunk->Length)) {
 663                                 cifs_dbg(VFS, "invalid copy chunk response\n");
 664                                 rc = -EIO;
 665                                 goto cchunk_out;
 666                         }
 667                         if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
 668                                 cifs_dbg(VFS, "invalid num chunks written\n");
 669                                 rc = -EIO;
 670                                 goto cchunk_out;
 671                         }
 672                         chunks_copied++;
 673
 674                         bytes_written = le32_to_cpu(retbuf->TotalBytesWritten);
 675                         src_off += bytes_written;
 676                         dest_off += bytes_written;
 677                         len -= bytes_written;
 678                         total_bytes_written += bytes_written;
 679
 680                         cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %zu\n",
 681                                 le32_to_cpu(retbuf->ChunksWritten),
 682                                 le32_to_cpu(retbuf->ChunkBytesWritten),
 683                                 bytes_written);
 684                 } else if (rc == -EINVAL) {
 685                         if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
 686                                 goto cchunk_out;
 687
 688                         cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
 689                                 le32_to_cpu(retbuf->ChunksWritten),
 690                                 le32_to_cpu(retbuf->ChunkBytesWritten),
 691                                 le32_to_cpu(retbuf->TotalBytesWritten));
 692
 693                         /*
 694                          * Check if this is the first request using these sizes,
 695                          * (ie check if copy succeed once with original sizes
 696                          * and check if the server gave us different sizes after
 697                          * we already updated max sizes on previous request).
 698                          * if not then why is the server returning an error now
 699                          */
 700                         if ((chunks_copied != 0) || chunk_sizes_updated)
 701                                 goto cchunk_out;
 702
 703                         /* Check that server is not asking us to grow size */
 704                         if (le32_to_cpu(retbuf->ChunkBytesWritten) <
 705                                         tcon->max_bytes_chunk)
 706                                 tcon->max_bytes_chunk =
 707                                         le32_to_cpu(retbuf->ChunkBytesWritten);
 708                         else
 709                                 goto cchunk_out; /* server gave us bogus size */
 710
 711                         /* No need to change MaxChunks since already set to 1 */
 712                         chunk_sizes_updated = true;
 713                 } else
 714                         goto cchunk_out;
 715         }
 716
 717 cchunk_out:
 718         kfree(pcchunk);
 719         kfree(retbuf);
 720         if (rc)
 721                 return rc;
 722         else
 723                 return total_bytes_written;
 724 }
 725
 726 static int
 727 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
 728                 struct cifs_fid *fid)
 729 {
 730         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 731 }
 732
 733 static unsigned int
 734 smb2_read_data_offset(char *buf)
 735 {
 736         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 737         return rsp->DataOffset;
 738 }
 739
 740 static unsigned int
 741 smb2_read_data_length(char *buf)
 742 {
 743         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 744         return le32_to_cpu(rsp->DataLength);
 745 }
 746
 747
 748 static int
 749 smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
 750                struct cifs_io_parms *parms, unsigned int *bytes_read,
 751                char **buf, int *buf_type)
 752 {
 753         parms->persistent_fid = pfid->persistent_fid;
 754         parms->volatile_fid = pfid->volatile_fid;
 755         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
 756 }
 757
 758 static int
 759 smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
 760                 struct cifs_io_parms *parms, unsigned int *written,
 761                 struct kvec *iov, unsigned long nr_segs)
 762 {
 763
 764         parms->persistent_fid = pfid->persistent_fid;
 765         parms->volatile_fid = pfid->volatile_fid;
 766         return SMB2_write(xid, parms, written, iov, nr_segs);
 767 }
 768
 769 /* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
 770 static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
 771                 struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
 772 {
 773         struct cifsInodeInfo *cifsi;
 774         int rc;
 775
 776         cifsi = CIFS_I(inode);
 777
 778         /* if file already sparse don't bother setting sparse again */
 779         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
 780                 return true; /* already sparse */
 781
 782         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
 783                 return true; /* already not sparse */
 784
 785         /*
 786          * Can't check for sparse support on share the usual way via the
 787          * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
 788          * since Samba server doesn't set the flag on the share, yet
 789          * supports the set sparse FSCTL and returns sparse correctly
 790          * in the file attributes. If we fail setting sparse though we
 791          * mark that server does not support sparse files for this share
 792          * to avoid repeatedly sending the unsupported fsctl to server
 793          * if the file is repeatedly extended.
 794          */
 795         if (tcon->broken_sparse_sup)
 796                 return false;
 797
 798         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
 799                         cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
 800                         true /* is_fctl */, false /* use_ipc */,
 801                         &setsparse, 1, NULL, NULL);
 802         if (rc) {
 803                 tcon->broken_sparse_sup = true;
 804                 cifs_dbg(FYI, "set sparse rc = %d\n", rc);
 805                 return false;
 806         }
 807
 808         if (setsparse)
 809                 cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
 810         else
 811                 cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
 812
 813         return true;
 814 }
 815
 816 static int
 817 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
 818                    struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
 819 {
 820         __le64 eof = cpu_to_le64(size);
 821         struct inode *inode;
 822
 823         /*
 824          * If extending file more than one page make sparse. Many Linux fs
 825          * make files sparse by default when extending via ftruncate
 826          */
 827         inode = d_inode(cfile->dentry);
 828
 829         if (!set_alloc && (size > inode->i_size + 8192)) {
 830                 __u8 set_sparse = 1;
 831
 832                 /* whether set sparse succeeds or not, extend the file */
 833                 smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
 834         }
 835
 836         return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
 837                             cfile->fid.volatile_fid, cfile->pid, &eof, false);
 838 }
 839
 840 static int
 841 smb2_duplicate_extents(const unsigned int xid,
 842                         struct cifsFileInfo *srcfile,
 843                         struct cifsFileInfo *trgtfile, u64 src_off,
 844                         u64 len, u64 dest_off)
 845 {
 846         int rc;
 847         unsigned int ret_data_len;
 848         struct duplicate_extents_to_file dup_ext_buf;
 849         struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
 850
 851         /* server fileays advertise duplicate extent support with this flag */
 852         if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
 853              FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
 854                 return -EOPNOTSUPP;
 855
 856         dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
 857         dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
 858         dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
 859         dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
 860         dup_ext_buf.ByteCount = cpu_to_le64(len);
 861         cifs_dbg(FYI, "duplicate extents: src off %lld dst off %lld len %lld",
 862                 src_off, dest_off, len);
 863
 864         rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
 865         if (rc)
 866                 goto duplicate_extents_out;
 867
 868         rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
 869                         trgtfile->fid.volatile_fid,
 870                         FSCTL_DUPLICATE_EXTENTS_TO_FILE,
 871                         true /* is_fsctl */, false /* use_ipc */,
 872                         (char *)&dup_ext_buf,
 873                         sizeof(struct duplicate_extents_to_file),
 874                         NULL,
 875                         &ret_data_len);
 876
 877         if (ret_data_len > 0)
 878                 cifs_dbg(FYI, "non-zero response length in duplicate extents");
 879
 880 duplicate_extents_out:
 881         return rc;
 882 }
 883
 884 static int
 885 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
 886                    struct cifsFileInfo *cfile)
 887 {
 888         return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
 889                             cfile->fid.volatile_fid);
 890 }
 891
 892 static int
 893 smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
 894                    struct cifsFileInfo *cfile)
 895 {
 896         struct fsctl_set_integrity_information_req integr_info;
 897         unsigned int ret_data_len;
 898
 899         integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
 900         integr_info.Flags = 0;
 901         integr_info.Reserved = 0;
 902
 903         return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
 904                         cfile->fid.volatile_fid,
 905                         FSCTL_SET_INTEGRITY_INFORMATION,
 906                         true /* is_fsctl */, false /* use_ipc */,
 907                         (char *)&integr_info,
 908                         sizeof(struct fsctl_set_integrity_information_req),
 909                         NULL,
 910                         &ret_data_len);
 911
 912 }
 913
 914 static int
 915 smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
 916                    struct cifsFileInfo *cfile, void __user *ioc_buf)
 917 {
 918         char *retbuf = NULL;
 919         unsigned int ret_data_len = 0;
 920         int rc;
 921         struct smb_snapshot_array snapshot_in;
 922
 923         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
 924                         cfile->fid.volatile_fid,
 925                         FSCTL_SRV_ENUMERATE_SNAPSHOTS,
 926                         true /* is_fsctl */, false /* use_ipc */,
 927                         NULL, 0 /* no input data */,
 928                         (char **)&retbuf,
 929                         &ret_data_len);
 930         cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d\n",
 931                         rc, ret_data_len);
 932         if (rc)
 933                 return rc;
 934
 935         if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) {
 936                 /* Fixup buffer */
 937                 if (copy_from_user(&snapshot_in, ioc_buf,
 938                     sizeof(struct smb_snapshot_array))) {
 939                         rc = -EFAULT;
 940                         kfree(retbuf);
 941                         return rc;
 942                 }
 943                 if (snapshot_in.snapshot_array_size < sizeof(struct smb_snapshot_array)) {
 944                         rc = -ERANGE;
 945                         kfree(retbuf);
 946                         return rc;
 947                 }
 948
 949                 if (ret_data_len > snapshot_in.snapshot_array_size)
 950                         ret_data_len = snapshot_in.snapshot_array_size;
 951
 952                 if (copy_to_user(ioc_buf, retbuf, ret_data_len))
 953                         rc = -EFAULT;
 954         }
 955
 956         kfree(retbuf);
 957         return rc;
 958 }
 959
 960 static int
 961 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
 962                      const char *path, struct cifs_sb_info *cifs_sb,
 963                      struct cifs_fid *fid, __u16 search_flags,
 964                      struct cifs_search_info *srch_inf)
 965 {
 966         __le16 *utf16_path;
 967         int rc;
 968         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 969         struct cifs_open_parms oparms;
 970
 971         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 972         if (!utf16_path)
 973                 return -ENOMEM;
 974
 975         oparms.tcon = tcon;
 976         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
 977         oparms.disposition = FILE_OPEN;
 978         oparms.create_options = 0;
 979         oparms.fid = fid;
 980         oparms.reconnect = false;
 981
 982         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 983         kfree(utf16_path);
 984         if (rc) {
 985                 cifs_dbg(FYI, "open dir failed rc=%d\n", rc);
 986                 return rc;
 987         }
 988
 989         srch_inf->entries_in_buffer = 0;
 990         srch_inf->index_of_last_entry = 0;
 991
 992         rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
 993                                   fid->volatile_fid, 0, srch_inf);
 994         if (rc) {
 995                 cifs_dbg(FYI, "query directory failed rc=%d\n", rc);
 996                 SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 997         }
 998         return rc;
 999 }
1000
1001 static int
1002 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
1003                     struct cifs_fid *fid, __u16 search_flags,
1004                     struct cifs_search_info *srch_inf)
1005 {
1006         return SMB2_query_directory(xid, tcon, fid->persistent_fid,
1007                                     fid->volatile_fid, 0, srch_inf);
1008 }
1009
1010 static int
1011 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
1012                struct cifs_fid *fid)
1013 {
1014         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1015 }
1016
1017 /*
1018 * If we negotiate SMB2 protocol and get STATUS_PENDING - update
1019 * the number of credits and return true. Otherwise - return false.
1020 */
1021 static bool
1022 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server, int length)
1023 {
1024         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
1025
1026         if (shdr->Status != STATUS_PENDING)
1027                 return false;
1028
1029         if (!length) {
1030                 spin_lock(&server->req_lock);
1031                 server->credits += le16_to_cpu(shdr->CreditRequest);
1032                 spin_unlock(&server->req_lock);
1033                 wake_up(&server->request_q);
1034         }
1035
1036         return true;
1037 }
1038
1039 static bool
1040 smb2_is_session_expired(char *buf)
1041 {
1042         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
1043
1044         if (shdr->Status != STATUS_NETWORK_SESSION_EXPIRED)
1045                 return false;
1046
1047         cifs_dbg(FYI, "Session expired\n");
1048         return true;
1049 }
1050
1051 static int
1052 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
1053                      struct cifsInodeInfo *cinode)
1054 {
1055         if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
1056                 return SMB2_lease_break(0, tcon, cinode->lease_key,
1057                                         smb2_get_lease_state(cinode));
1058
1059         return SMB2_oplock_break(0, tcon, fid->persistent_fid,
1060                                  fid->volatile_fid,
1061                                  CIFS_CACHE_READ(cinode) ? 1 : 0);
1062 }
1063
1064 static int
1065 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
1066              struct kstatfs *buf)
1067 {
1068         int rc;
1069         __le16 srch_path = 0; /* Null - open root of share */
1070         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1071         struct cifs_open_parms oparms;
1072         struct cifs_fid fid;
1073
1074         oparms.tcon = tcon;
1075         oparms.desired_access = FILE_READ_ATTRIBUTES;
1076         oparms.disposition = FILE_OPEN;
1077         oparms.create_options = 0;
1078         oparms.fid = &fid;
1079         oparms.reconnect = false;
1080
1081         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
1082         if (rc)
1083                 return rc;
1084         buf->f_type = SMB2_MAGIC_NUMBER;
1085         rc = SMB2_QFS_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
1086                            buf);
1087         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
1088         return rc;
1089 }
1090
1091 static bool
1092 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
1093 {
1094         return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
1095                ob1->fid.volatile_fid == ob2->fid.volatile_fid;
1096 }
1097
1098 static int
1099 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
1100                __u64 length, __u32 type, int lock, int unlock, bool wait)
1101 {
1102         if (unlock && !lock)
1103                 type = SMB2_LOCKFLAG_UNLOCK;
1104         return SMB2_lock(xid, tlink_tcon(cfile->tlink),
1105                          cfile->fid.persistent_fid, cfile->fid.volatile_fid,
1106                          current->tgid, length, offset, type, wait);
1107 }
1108
1109 static void
1110 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
1111 {
1112         memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
1113 }
1114
1115 static void
1116 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
1117 {
1118         memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
1119 }
1120
1121 static void
1122 smb2_new_lease_key(struct cifs_fid *fid)
1123 {
1124         generate_random_uuid(fid->lease_key);
1125 }
1126
1127 static int
1128 smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
1129                    const char *search_name,
1130                    struct dfs_info3_param **target_nodes,
1131                    unsigned int *num_of_nodes,
1132                    const struct nls_table *nls_codepage, int remap)
1133 {
1134         int rc;
1135         __le16 *utf16_path = NULL;
1136         int utf16_path_len = 0;
1137         struct cifs_tcon *tcon;
1138         struct fsctl_get_dfs_referral_req *dfs_req = NULL;
1139         struct get_dfs_referral_rsp *dfs_rsp = NULL;
1140         u32 dfs_req_size = 0, dfs_rsp_size = 0;
1141
1142         cifs_dbg(FYI, "smb2_get_dfs_refer path <%s>\n", search_name);
1143
1144         /*
1145          * Use any tcon from the current session. Here, the first one.
1146          */
1147         spin_lock(&cifs_tcp_ses_lock);
1148         tcon = list_first_entry_or_null(&ses->tcon_list, struct cifs_tcon,
1149                                         tcon_list);
1150         if (tcon)
1151                 tcon->tc_count++;
1152         spin_unlock(&cifs_tcp_ses_lock);
1153
1154         if (!tcon) {
1155                 cifs_dbg(VFS, "session %p has no tcon available for a dfs referral request\n",
1156                          ses);
1157                 rc = -ENOTCONN;
1158                 goto out;
1159         }
1160
1161         utf16_path = cifs_strndup_to_utf16(search_name, PATH_MAX,
1162                                            &utf16_path_len,
1163                                            nls_codepage, remap);
1164         if (!utf16_path) {
1165                 rc = -ENOMEM;
1166                 goto out;
1167         }
1168
1169         dfs_req_size = sizeof(*dfs_req) + utf16_path_len;
1170         dfs_req = kzalloc(dfs_req_size, GFP_KERNEL);
1171         if (!dfs_req) {
1172                 rc = -ENOMEM;
1173                 goto out;
1174         }
1175
1176         /* Highest DFS referral version understood */
1177         dfs_req->MaxReferralLevel = DFS_VERSION;
1178
1179         /* Path to resolve in an UTF-16 null-terminated string */
1180         memcpy(dfs_req->RequestFileName, utf16_path, utf16_path_len);
1181
1182         do {
1183                 /* try first with IPC */
1184                 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1185                                 FSCTL_DFS_GET_REFERRALS,
1186                                 true /* is_fsctl */, true /* use_ipc */,
1187                                 (char *)dfs_req, dfs_req_size,
1188                                 (char **)&dfs_rsp, &dfs_rsp_size);
1189                 if (rc == -ENOTCONN) {
1190                         /* try with normal tcon */
1191                         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1192                                         FSCTL_DFS_GET_REFERRALS,
1193                                         true /* is_fsctl */, false /*use_ipc*/,
1194                                         (char *)dfs_req, dfs_req_size,
1195                                         (char **)&dfs_rsp, &dfs_rsp_size);
1196                 }
1197         } while (rc == -EAGAIN);
1198
1199         if (rc) {
1200                 cifs_dbg(VFS, "ioctl error in smb2_get_dfs_refer rc=%d\n", rc);
1201                 goto out;
1202         }
1203
1204         rc = parse_dfs_referrals(dfs_rsp, dfs_rsp_size,
1205                                  num_of_nodes, target_nodes,
1206                                  nls_codepage, remap, search_name,
1207                                  true /* is_unicode */);
1208         if (rc) {
1209                 cifs_dbg(VFS, "parse error in smb2_get_dfs_refer rc=%d\n", rc);
1210                 goto out;
1211         }
1212
1213  out:
1214         if (tcon) {
1215                 spin_lock(&cifs_tcp_ses_lock);
1216                 tcon->tc_count--;
1217                 spin_unlock(&cifs_tcp_ses_lock);
1218         }
1219         kfree(utf16_path);
1220         kfree(dfs_req);
1221         kfree(dfs_rsp);
1222         return rc;
1223 }
1224 #define SMB2_SYMLINK_STRUCT_SIZE \
1225         (sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
1226
1227 static int
1228 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
1229                    const char *full_path, char **target_path,
1230                    struct cifs_sb_info *cifs_sb)
1231 {
1232         int rc;
1233         __le16 *utf16_path;
1234         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1235         struct cifs_open_parms oparms;
1236         struct cifs_fid fid;
1237         struct smb2_err_rsp *err_buf = NULL;
1238         struct smb2_symlink_err_rsp *symlink;
1239         unsigned int sub_len;
1240         unsigned int sub_offset;
1241         unsigned int print_len;
1242         unsigned int print_offset;
1243
1244         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
1245
1246         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
1247         if (!utf16_path)
1248                 return -ENOMEM;
1249
1250         oparms.tcon = tcon;
1251         oparms.desired_access = FILE_READ_ATTRIBUTES;
1252         oparms.disposition = FILE_OPEN;
1253         oparms.create_options = 0;
1254         oparms.fid = &fid;
1255         oparms.reconnect = false;
1256
1257         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_buf);
1258
1259         if (!rc || !err_buf) {
1260                 kfree(utf16_path);
1261                 return -ENOENT;
1262         }
1263
1264         if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
1265             get_rfc1002_length(err_buf) + 4 < SMB2_SYMLINK_STRUCT_SIZE) {
1266                 kfree(utf16_path);
1267                 return -ENOENT;
1268         }
1269
1270         /* open must fail on symlink - reset rc */
1271         rc = 0;
1272         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
1273         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
1274         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
1275         print_len = le16_to_cpu(symlink->PrintNameLength);
1276         print_offset = le16_to_cpu(symlink->PrintNameOffset);
1277
1278         if (get_rfc1002_length(err_buf) + 4 <
1279                         SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
1280                 kfree(utf16_path);
1281                 return -ENOENT;
1282         }
1283
1284         if (get_rfc1002_length(err_buf) + 4 <
1285                         SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
1286                 kfree(utf16_path);
1287                 return -ENOENT;
1288         }
1289
1290         *target_path = cifs_strndup_from_utf16(
1291                                 (char *)symlink->PathBuffer + sub_offset,
1292                                 sub_len, true, cifs_sb->local_nls);
1293         if (!(*target_path)) {
1294                 kfree(utf16_path);
1295                 return -ENOMEM;
1296         }
1297         convert_delimiter(*target_path, '/');
1298         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
1299         kfree(utf16_path);
1300         return rc;
1301 }
1302
1303 #ifdef CONFIG_CIFS_ACL
1304 static struct cifs_ntsd *
1305 get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
1306                 const struct cifs_fid *cifsfid, u32 *pacllen)
1307 {
1308         struct cifs_ntsd *pntsd = NULL;
1309         unsigned int xid;
1310         int rc = -EOPNOTSUPP;
1311         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
1312
1313         if (IS_ERR(tlink))
1314                 return ERR_CAST(tlink);
1315
1316         xid = get_xid();
1317         cifs_dbg(FYI, "trying to get acl\n");
1318
1319         rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
1320                             cifsfid->volatile_fid, (void **)&pntsd, pacllen);
1321         free_xid(xid);
1322
1323         cifs_put_tlink(tlink);
1324
1325         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
1326         if (rc)
1327                 return ERR_PTR(rc);
1328         return pntsd;
1329
1330 }
1331
1332 static struct cifs_ntsd *
1333 get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
1334                 const char *path, u32 *pacllen)
1335 {
1336         struct cifs_ntsd *pntsd = NULL;
1337         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1338         unsigned int xid;
1339         int rc;
1340         struct cifs_tcon *tcon;
1341         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
1342         struct cifs_fid fid;
1343         struct cifs_open_parms oparms;
1344         __le16 *utf16_path;
1345
1346         cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
1347         if (IS_ERR(tlink))
1348                 return ERR_CAST(tlink);
1349
1350         tcon = tlink_tcon(tlink);
1351         xid = get_xid();
1352
1353         if (backup_cred(cifs_sb))
1354                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1355         else
1356                 oparms.create_options = 0;
1357
1358         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1359         if (!utf16_path)
1360                 return ERR_PTR(-ENOMEM);
1361
1362         oparms.tcon = tcon;
1363         oparms.desired_access = READ_CONTROL;
1364         oparms.disposition = FILE_OPEN;
1365         oparms.fid = &fid;
1366         oparms.reconnect = false;
1367
1368         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
1369         kfree(utf16_path);
1370         if (!rc) {
1371                 rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
1372                             fid.volatile_fid, (void **)&pntsd, pacllen);
1373                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
1374         }
1375
1376         cifs_put_tlink(tlink);
1377         free_xid(xid);
1378
1379         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
1380         if (rc)
1381                 return ERR_PTR(rc);
1382         return pntsd;
1383 }
1384
1385 #ifdef CONFIG_CIFS_ACL
1386 static int
1387 set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
1388                 struct inode *inode, const char *path, int aclflag)
1389 {
1390         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1391         unsigned int xid;
1392         int rc, access_flags = 0;
1393         struct cifs_tcon *tcon;
1394         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1395         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
1396         struct cifs_fid fid;
1397         struct cifs_open_parms oparms;
1398         __le16 *utf16_path;
1399
1400         cifs_dbg(FYI, "set smb3 acl for path %s\n", path);
1401         if (IS_ERR(tlink))
1402                 return PTR_ERR(tlink);
1403
1404         tcon = tlink_tcon(tlink);
1405         xid = get_xid();
1406
1407         if (backup_cred(cifs_sb))
1408                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1409         else
1410                 oparms.create_options = 0;
1411
1412         if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP)
1413                 access_flags = WRITE_OWNER;
1414         else
1415                 access_flags = WRITE_DAC;
1416
1417         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1418         if (!utf16_path)
1419                 return -ENOMEM;
1420
1421         oparms.tcon = tcon;
1422         oparms.desired_access = access_flags;
1423         oparms.disposition = FILE_OPEN;
1424         oparms.path = path;
1425         oparms.fid = &fid;
1426         oparms.reconnect = false;
1427
1428         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
1429         kfree(utf16_path);
1430         if (!rc) {
1431                 rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
1432                             fid.volatile_fid, pnntsd, acllen, aclflag);
1433                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
1434         }
1435
1436         cifs_put_tlink(tlink);
1437         free_xid(xid);
1438         return rc;
1439 }
1440 #endif /* CIFS_ACL */
1441
1442 /* Retrieve an ACL from the server */
1443 static struct cifs_ntsd *
1444 get_smb2_acl(struct cifs_sb_info *cifs_sb,
1445                                       struct inode *inode, const char *path,
1446                                       u32 *pacllen)
1447 {
1448         struct cifs_ntsd *pntsd = NULL;
1449         struct cifsFileInfo *open_file = NULL;
1450
1451         if (inode)
1452                 open_file = find_readable_file(CIFS_I(inode), true);
1453         if (!open_file)
1454                 return get_smb2_acl_by_path(cifs_sb, path, pacllen);
1455
1456         pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen);
1457         cifsFileInfo_put(open_file);
1458         return pntsd;
1459 }
1460 #endif
1461
1462 static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
1463                             loff_t offset, loff_t len, bool keep_size)
1464 {
1465         struct inode *inode;
1466         struct cifsInodeInfo *cifsi;
1467         struct cifsFileInfo *cfile = file->private_data;
1468         struct file_zero_data_information fsctl_buf;
1469         long rc;
1470         unsigned int xid;
1471
1472         xid = get_xid();
1473
1474         inode = d_inode(cfile->dentry);
1475         cifsi = CIFS_I(inode);
1476
1477         /* if file not oplocked can't be sure whether asking to extend size */
1478         if (!CIFS_CACHE_READ(cifsi))
1479                 if (keep_size == false)
1480                         return -EOPNOTSUPP;
1481
1482         /*
1483          * Must check if file sparse since fallocate -z (zero range) assumes
1484          * non-sparse allocation
1485          */
1486         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE))
1487                 return -EOPNOTSUPP;
1488
1489         /*
1490          * need to make sure we are not asked to extend the file since the SMB3
1491          * fsctl does not change the file size. In the future we could change
1492          * this to zero the first part of the range then set the file size
1493          * which for a non sparse file would zero the newly extended range
1494          */
1495         if (keep_size == false)
1496                 if (i_size_read(inode) < offset + len)
1497                         return -EOPNOTSUPP;
1498
1499         cifs_dbg(FYI, "offset %lld len %lld", offset, len);
1500
1501         fsctl_buf.FileOffset = cpu_to_le64(offset);
1502         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
1503
1504         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1505                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
1506                         true /* is_fctl */, false /* use_ipc */,
1507                         (char *)&fsctl_buf,
1508                         sizeof(struct file_zero_data_information), NULL, NULL);
1509         free_xid(xid);
1510         return rc;
1511 }
1512
1513 static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
1514                             loff_t offset, loff_t len)
1515 {
1516         struct inode *inode;
1517         struct cifsInodeInfo *cifsi;
1518         struct cifsFileInfo *cfile = file->private_data;
1519         struct file_zero_data_information fsctl_buf;
1520         long rc;
1521         unsigned int xid;
1522         __u8 set_sparse = 1;
1523
1524         xid = get_xid();
1525
1526         inode = d_inode(cfile->dentry);
1527         cifsi = CIFS_I(inode);
1528
1529         /* Need to make file sparse, if not already, before freeing range. */
1530         /* Consider adding equivalent for compressed since it could also work */
1531         if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse))
1532                 return -EOPNOTSUPP;
1533
1534         cifs_dbg(FYI, "offset %lld len %lld", offset, len);
1535
1536         fsctl_buf.FileOffset = cpu_to_le64(offset);
1537         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
1538
1539         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1540                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
1541                         true /* is_fctl */, false /* use_ipc */,
1542                         (char *)&fsctl_buf,
1543                         sizeof(struct file_zero_data_information), NULL, NULL);
1544         free_xid(xid);
1545         return rc;
1546 }
1547
1548 static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
1549                             loff_t off, loff_t len, bool keep_size)
1550 {
1551         struct inode *inode;
1552         struct cifsInodeInfo *cifsi;
1553         struct cifsFileInfo *cfile = file->private_data;
1554         long rc = -EOPNOTSUPP;
1555         unsigned int xid;
1556
1557         xid = get_xid();
1558
1559         inode = d_inode(cfile->dentry);
1560         cifsi = CIFS_I(inode);
1561
1562         /* if file not oplocked can't be sure whether asking to extend size */
1563         if (!CIFS_CACHE_READ(cifsi))
1564                 if (keep_size == false)
1565                         return -EOPNOTSUPP;
1566
1567         /*
1568          * Files are non-sparse by default so falloc may be a no-op
1569          * Must check if file sparse. If not sparse, and not extending
1570          * then no need to do anything since file already allocated
1571          */
1572         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
1573                 if (keep_size == true)
1574                         return 0;
1575                 /* check if extending file */
1576                 else if (i_size_read(inode) >= off + len)
1577                         /* not extending file and already not sparse */
1578                         return 0;
1579                 /* BB: in future add else clause to extend file */
1580                 else
1581                         return -EOPNOTSUPP;
1582         }
1583
1584         if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
1585                 /*
1586                  * Check if falloc starts within first few pages of file
1587                  * and ends within a few pages of the end of file to
1588                  * ensure that most of file is being forced to be
1589                  * fallocated now. If so then setting whole file sparse
1590                  * ie potentially making a few extra pages at the beginning
1591                  * or end of the file non-sparse via set_sparse is harmless.
1592                  */
1593                 if ((off > 8192) || (off + len + 8192 < i_size_read(inode)))
1594                         return -EOPNOTSUPP;
1595
1596                 rc = smb2_set_sparse(xid, tcon, cfile, inode, false);
1597         }
1598         /* BB: else ... in future add code to extend file and set sparse */
1599
1600
1601         free_xid(xid);
1602         return rc;
1603 }
1604
1605
1606 static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
1607                            loff_t off, loff_t len)
1608 {
1609         /* KEEP_SIZE already checked for by do_fallocate */
1610         if (mode & FALLOC_FL_PUNCH_HOLE)
1611                 return smb3_punch_hole(file, tcon, off, len);
1612         else if (mode & FALLOC_FL_ZERO_RANGE) {
1613                 if (mode & FALLOC_FL_KEEP_SIZE)
1614                         return smb3_zero_range(file, tcon, off, len, true);
1615                 return smb3_zero_range(file, tcon, off, len, false);
1616         } else if (mode == FALLOC_FL_KEEP_SIZE)
1617                 return smb3_simple_falloc(file, tcon, off, len, true);
1618         else if (mode == 0)
1619                 return smb3_simple_falloc(file, tcon, off, len, false);
1620
1621         return -EOPNOTSUPP;
1622 }
1623
1624 static void
1625 smb2_downgrade_oplock(struct TCP_Server_Info *server,
1626                         struct cifsInodeInfo *cinode, bool set_level2)
1627 {
1628         if (set_level2)
1629                 server->ops->set_oplock_level(cinode, SMB2_OPLOCK_LEVEL_II,
1630                                                 0, NULL);
1631         else
1632                 server->ops->set_oplock_level(cinode, 0, 0, NULL);
1633 }
1634
1635 static void
1636 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
1637                       unsigned int epoch, bool *purge_cache)
1638 {
1639         oplock &= 0xFF;
1640         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
1641                 return;
1642         if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1643                 cinode->oplock = CIFS_CACHE_RHW_FLG;
1644                 cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
1645                          &cinode->vfs_inode);
1646         } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
1647                 cinode->oplock = CIFS_CACHE_RW_FLG;
1648                 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
1649                          &cinode->vfs_inode);
1650         } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
1651                 cinode->oplock = CIFS_CACHE_READ_FLG;
1652                 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
1653                          &cinode->vfs_inode);
1654         } else
1655                 cinode->oplock = 0;
1656 }
1657
1658 static void
1659 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
1660                        unsigned int epoch, bool *purge_cache)
1661 {
1662         char message[5] = {0};
1663
1664         oplock &= 0xFF;
1665         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
1666                 return;
1667
1668         cinode->oplock = 0;
1669         if (oplock & SMB2_LEASE_READ_CACHING_HE) {
1670                 cinode->oplock |= CIFS_CACHE_READ_FLG;
1671                 strcat(message, "R");
1672         }
1673         if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
1674                 cinode->oplock |= CIFS_CACHE_HANDLE_FLG;
1675                 strcat(message, "H");
1676         }
1677         if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
1678                 cinode->oplock |= CIFS_CACHE_WRITE_FLG;
1679                 strcat(message, "W");
1680         }
1681         if (!cinode->oplock)
1682                 strcat(message, "None");
1683         cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
1684                  &cinode->vfs_inode);
1685 }
1686
1687 static void
1688 smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
1689                       unsigned int epoch, bool *purge_cache)
1690 {
1691         unsigned int old_oplock = cinode->oplock;
1692
1693         smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
1694
1695         if (purge_cache) {
1696                 *purge_cache = false;
1697                 if (old_oplock == CIFS_CACHE_READ_FLG) {
1698                         if (cinode->oplock == CIFS_CACHE_READ_FLG &&
1699                             (epoch - cinode->epoch > 0))
1700                                 *purge_cache = true;
1701                         else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
1702                                  (epoch - cinode->epoch > 1))
1703                                 *purge_cache = true;
1704                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
1705                                  (epoch - cinode->epoch > 1))
1706                                 *purge_cache = true;
1707                         else if (cinode->oplock == 0 &&
1708                                  (epoch - cinode->epoch > 0))
1709                                 *purge_cache = true;
1710                 } else if (old_oplock == CIFS_CACHE_RH_FLG) {
1711                         if (cinode->oplock == CIFS_CACHE_RH_FLG &&
1712                             (epoch - cinode->epoch > 0))
1713                                 *purge_cache = true;
1714                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
1715                                  (epoch - cinode->epoch > 1))
1716                                 *purge_cache = true;
1717                 }
1718                 cinode->epoch = epoch;
1719         }
1720 }
1721
1722 static bool
1723 smb2_is_read_op(__u32 oplock)
1724 {
1725         return oplock == SMB2_OPLOCK_LEVEL_II;
1726 }
1727
1728 static bool
1729 smb21_is_read_op(__u32 oplock)
1730 {
1731         return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
1732                !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
1733 }
1734
1735 static __le32
1736 map_oplock_to_lease(u8 oplock)
1737 {
1738         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
1739                 return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
1740         else if (oplock == SMB2_OPLOCK_LEVEL_II)
1741                 return SMB2_LEASE_READ_CACHING;
1742         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
1743                 return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
1744                        SMB2_LEASE_WRITE_CACHING;
1745         return 0;
1746 }
1747
1748 static char *
1749 smb2_create_lease_buf(u8 *lease_key, u8 oplock)
1750 {
1751         struct create_lease *buf;
1752
1753         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
1754         if (!buf)
1755                 return NULL;
1756
1757         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
1758         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
1759         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
1760
1761         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1762                                         (struct create_lease, lcontext));
1763         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
1764         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1765                                 (struct create_lease, Name));
1766         buf->ccontext.NameLength = cpu_to_le16(4);
1767         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
1768         buf->Name[0] = 'R';
1769         buf->Name[1] = 'q';
1770         buf->Name[2] = 'L';
1771         buf->Name[3] = 's';
1772         return (char *)buf;
1773 }
1774
1775 static char *
1776 smb3_create_lease_buf(u8 *lease_key, u8 oplock)
1777 {
1778         struct create_lease_v2 *buf;
1779
1780         buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
1781         if (!buf)
1782                 return NULL;
1783
1784         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
1785         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
1786         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
1787
1788         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1789                                         (struct create_lease_v2, lcontext));
1790         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
1791         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1792                                 (struct create_lease_v2, Name));
1793         buf->ccontext.NameLength = cpu_to_le16(4);
1794         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
1795         buf->Name[0] = 'R';
1796         buf->Name[1] = 'q';
1797         buf->Name[2] = 'L';
1798         buf->Name[3] = 's';
1799         return (char *)buf;
1800 }
1801
1802 static __u8
1803 smb2_parse_lease_buf(void *buf, unsigned int *epoch)
1804 {
1805         struct create_lease *lc = (struct create_lease *)buf;
1806
1807         *epoch = 0; /* not used */
1808         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
1809                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
1810         return le32_to_cpu(lc->lcontext.LeaseState);
1811 }
1812
1813 static __u8
1814 smb3_parse_lease_buf(void *buf, unsigned int *epoch)
1815 {
1816         struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
1817
1818         *epoch = le16_to_cpu(lc->lcontext.Epoch);
1819         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
1820                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
1821         return le32_to_cpu(lc->lcontext.LeaseState);
1822 }
1823
1824 static unsigned int
1825 smb2_wp_retry_size(struct inode *inode)
1826 {
1827         return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
1828                      SMB2_MAX_BUFFER_SIZE);
1829 }
1830
1831 static bool
1832 smb2_dir_needs_close(struct cifsFileInfo *cfile)
1833 {
1834         return !cfile->invalidHandle;
1835 }
1836
1837 static void
1838 fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, struct smb_rqst *old_rq)
1839 {
1840         struct smb2_sync_hdr *shdr =
1841                         (struct smb2_sync_hdr *)old_rq->rq_iov[1].iov_base;
1842         unsigned int orig_len = get_rfc1002_length(old_rq->rq_iov[0].iov_base);
1843
1844         memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
1845         tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
1846         tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
1847         tr_hdr->Flags = cpu_to_le16(0x01);
1848         get_random_bytes(&tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
1849         memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
1850         inc_rfc1001_len(tr_hdr, sizeof(struct smb2_transform_hdr) - 4);
1851         inc_rfc1001_len(tr_hdr, orig_len);
1852 }
1853
1854 static struct scatterlist *
1855 init_sg(struct smb_rqst *rqst, u8 *sign)
1856 {
1857         unsigned int sg_len = rqst->rq_nvec + rqst->rq_npages + 1;
1858         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 24;
1859         struct scatterlist *sg;
1860         unsigned int i;
1861         unsigned int j;
1862
1863         sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
1864         if (!sg)
1865                 return NULL;
1866
1867         sg_init_table(sg, sg_len);
1868         sg_set_buf(&sg[0], rqst->rq_iov[0].iov_base + 24, assoc_data_len);
1869         for (i = 1; i < rqst->rq_nvec; i++)
1870                 sg_set_buf(&sg[i], rqst->rq_iov[i].iov_base,
1871                                                 rqst->rq_iov[i].iov_len);
1872         for (j = 0; i < sg_len - 1; i++, j++) {
1873                 unsigned int len = (j < rqst->rq_npages - 1) ? rqst->rq_pagesz
1874                                                         : rqst->rq_tailsz;
1875                 sg_set_page(&sg[i], rqst->rq_pages[j], len, 0);
1876         }
1877         sg_set_buf(&sg[sg_len - 1], sign, SMB2_SIGNATURE_SIZE);
1878         return sg;
1879 }
1880
1881 struct cifs_crypt_result {
1882         int err;
1883         struct completion completion;
1884 };
1885
1886 static void cifs_crypt_complete(struct crypto_async_request *req, int err)
1887 {
1888         struct cifs_crypt_result *res = req->data;
1889
1890         if (err == -EINPROGRESS)
1891                 return;
1892
1893         res->err = err;
1894         complete(&res->completion);
1895 }
1896
1897 static int
1898 smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
1899 {
1900         struct cifs_ses *ses;
1901         u8 *ses_enc_key;
1902
1903         spin_lock(&cifs_tcp_ses_lock);
1904         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
1905                 if (ses->Suid != ses_id)
1906                         continue;
1907                 ses_enc_key = enc ? ses->smb3encryptionkey :
1908                                                         ses->smb3decryptionkey;
1909                 memcpy(key, ses_enc_key, SMB3_SIGN_KEY_SIZE);
1910                 spin_unlock(&cifs_tcp_ses_lock);
1911                 return 0;
1912         }
1913         spin_unlock(&cifs_tcp_ses_lock);
1914
1915         return 1;
1916 }
1917 /*
1918  * Encrypt or decrypt @rqst message. @rqst has the following format:
1919  * iov[0] - transform header (associate data),
1920  * iov[1-N] and pages - data to encrypt.
1921  * On success return encrypted data in iov[1-N] and pages, leave iov[0]
1922  * untouched.
1923  */
1924 static int
1925 crypt_message(struct TCP_Server_Info *server, struct smb_rqst *rqst, int enc)
1926 {
1927         struct smb2_transform_hdr *tr_hdr =
1928                         (struct smb2_transform_hdr *)rqst->rq_iov[0].iov_base;
1929         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 24;
1930         int rc = 0;
1931         struct scatterlist *sg;
1932         u8 sign[SMB2_SIGNATURE_SIZE] = {};
1933         u8 key[SMB3_SIGN_KEY_SIZE];
1934         struct aead_request *req;
1935         char *iv;
1936         unsigned int iv_len;
1937         struct cifs_crypt_result result = {0, };
1938         struct crypto_aead *tfm;
1939         unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
1940
1941         init_completion(&result.completion);
1942
1943         rc = smb2_get_enc_key(server, tr_hdr->SessionId, enc, key);
1944         if (rc) {
1945                 cifs_dbg(VFS, "%s: Could not get %scryption key\n", __func__,
1946                          enc ? "en" : "de");
1947                 return 0;
1948         }
1949
1950         rc = smb3_crypto_aead_allocate(server);
1951         if (rc) {
1952                 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
1953                 return rc;
1954         }
1955
1956         tfm = enc ? server->secmech.ccmaesencrypt :
1957                                                 server->secmech.ccmaesdecrypt;
1958         rc = crypto_aead_setkey(tfm, key, SMB3_SIGN_KEY_SIZE);
1959         if (rc) {
1960                 cifs_dbg(VFS, "%s: Failed to set aead key %d\n", __func__, rc);
1961                 return rc;
1962         }
1963
1964         rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
1965         if (rc) {
1966                 cifs_dbg(VFS, "%s: Failed to set authsize %d\n", __func__, rc);
1967                 return rc;
1968         }
1969
1970         req = aead_request_alloc(tfm, GFP_KERNEL);
1971         if (!req) {
1972                 cifs_dbg(VFS, "%s: Failed to alloc aead request", __func__);
1973                 return -ENOMEM;
1974         }
1975
1976         if (!enc) {
1977                 memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
1978                 crypt_len += SMB2_SIGNATURE_SIZE;
1979         }
1980
1981         sg = init_sg(rqst, sign);
1982         if (!sg) {
1983                 cifs_dbg(VFS, "%s: Failed to init sg", __func__);
1984                 rc = -ENOMEM;
1985                 goto free_req;
1986         }
1987
1988         iv_len = crypto_aead_ivsize(tfm);
1989         iv = kzalloc(iv_len, GFP_KERNEL);
1990         if (!iv) {
1991                 cifs_dbg(VFS, "%s: Failed to alloc IV", __func__);
1992                 rc = -ENOMEM;
1993                 goto free_sg;
1994         }
1995         iv[0] = 3;
1996         memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
1997
1998         aead_request_set_crypt(req, sg, sg, crypt_len, iv);
1999         aead_request_set_ad(req, assoc_data_len);
2000
2001         aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
2002                                   cifs_crypt_complete, &result);
2003
2004         rc = enc ? crypto_aead_encrypt(req) : crypto_aead_decrypt(req);
2005
2006         if (rc == -EINPROGRESS || rc == -EBUSY) {
2007                 wait_for_completion(&result.completion);
2008                 rc = result.err;
2009         }
2010
2011         if (!rc && enc)
2012                 memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
2013
2014         kfree(iv);
2015 free_sg:
2016         kfree(sg);
2017 free_req:
2018         kfree(req);
2019         return rc;
2020 }
2021
2022 static int
2023 smb3_init_transform_rq(struct TCP_Server_Info *server, struct smb_rqst *new_rq,
2024                        struct smb_rqst *old_rq)
2025 {
2026         struct kvec *iov;
2027         struct page **pages;
2028         struct smb2_transform_hdr *tr_hdr;
2029         unsigned int npages = old_rq->rq_npages;
2030         int i;
2031         int rc = -ENOMEM;
2032
2033         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
2034         if (!pages)
2035                 return rc;
2036
2037         new_rq->rq_pages = pages;
2038         new_rq->rq_npages = old_rq->rq_npages;
2039         new_rq->rq_pagesz = old_rq->rq_pagesz;
2040         new_rq->rq_tailsz = old_rq->rq_tailsz;
2041
2042         for (i = 0; i < npages; i++) {
2043                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2044                 if (!pages[i])
2045                         goto err_free_pages;
2046         }
2047
2048         iov = kmalloc_array(old_rq->rq_nvec, sizeof(struct kvec), GFP_KERNEL);
2049         if (!iov)
2050                 goto err_free_pages;
2051
2052         /* copy all iovs from the old except the 1st one (rfc1002 length) */
2053         memcpy(&iov[1], &old_rq->rq_iov[1],
2054                                 sizeof(struct kvec) * (old_rq->rq_nvec - 1));
2055         new_rq->rq_iov = iov;
2056         new_rq->rq_nvec = old_rq->rq_nvec;
2057
2058         tr_hdr = kmalloc(sizeof(struct smb2_transform_hdr), GFP_KERNEL);
2059         if (!tr_hdr)
2060                 goto err_free_iov;
2061
2062         /* fill the 1st iov with a transform header */
2063         fill_transform_hdr(tr_hdr, old_rq);
2064         new_rq->rq_iov[0].iov_base = tr_hdr;
2065         new_rq->rq_iov[0].iov_len = sizeof(struct smb2_transform_hdr);
2066
2067         /* copy pages form the old */
2068         for (i = 0; i < npages; i++) {
2069                 char *dst = kmap(new_rq->rq_pages[i]);
2070                 char *src = kmap(old_rq->rq_pages[i]);
2071                 unsigned int len = (i < npages - 1) ? new_rq->rq_pagesz :
2072                                                         new_rq->rq_tailsz;
2073                 memcpy(dst, src, len);
2074                 kunmap(new_rq->rq_pages[i]);
2075                 kunmap(old_rq->rq_pages[i]);
2076         }
2077
2078         rc = crypt_message(server, new_rq, 1);
2079         cifs_dbg(FYI, "encrypt message returned %d", rc);
2080         if (rc)
2081                 goto err_free_tr_hdr;
2082
2083         return rc;
2084
2085 err_free_tr_hdr:
2086         kfree(tr_hdr);
2087 err_free_iov:
2088         kfree(iov);
2089 err_free_pages:
2090         for (i = i - 1; i >= 0; i--)
2091                 put_page(pages[i]);
2092         kfree(pages);
2093         return rc;
2094 }
2095
2096 static void
2097 smb3_free_transform_rq(struct smb_rqst *rqst)
2098 {
2099         int i = rqst->rq_npages - 1;
2100
2101         for (; i >= 0; i--)
2102                 put_page(rqst->rq_pages[i]);
2103         kfree(rqst->rq_pages);
2104         /* free transform header */
2105         kfree(rqst->rq_iov[0].iov_base);
2106         kfree(rqst->rq_iov);
2107 }
2108
2109 static int
2110 smb3_is_transform_hdr(void *buf)
2111 {
2112         struct smb2_transform_hdr *trhdr = buf;
2113
2114         return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
2115 }
2116
2117 static int
2118 decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
2119                  unsigned int buf_data_size, struct page **pages,
2120                  unsigned int npages, unsigned int page_data_size)
2121 {
2122         struct kvec iov[2];
2123         struct smb_rqst rqst = {NULL};
2124         struct smb2_hdr *hdr;
2125         int rc;
2126
2127         iov[0].iov_base = buf;
2128         iov[0].iov_len = sizeof(struct smb2_transform_hdr);
2129         iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
2130         iov[1].iov_len = buf_data_size;
2131
2132         rqst.rq_iov = iov;
2133         rqst.rq_nvec = 2;
2134         rqst.rq_pages = pages;
2135         rqst.rq_npages = npages;
2136         rqst.rq_pagesz = PAGE_SIZE;
2137         rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
2138
2139         rc = crypt_message(server, &rqst, 0);
2140         cifs_dbg(FYI, "decrypt message returned %d\n", rc);
2141
2142         if (rc)
2143                 return rc;
2144
2145         memmove(buf + 4, iov[1].iov_base, buf_data_size);
2146         hdr = (struct smb2_hdr *)buf;
2147         hdr->smb2_buf_length = cpu_to_be32(buf_data_size + page_data_size);
2148         server->total_read = buf_data_size + page_data_size + 4;
2149
2150         return rc;
2151 }
2152
2153 static int
2154 read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
2155                      unsigned int npages, unsigned int len)
2156 {
2157         int i;
2158         int length;
2159
2160         for (i = 0; i < npages; i++) {
2161                 struct page *page = pages[i];
2162                 size_t n;
2163
2164                 n = len;
2165                 if (len >= PAGE_SIZE) {
2166                         /* enough data to fill the page */
2167                         n = PAGE_SIZE;
2168                         len -= n;
2169                 } else {
2170                         zero_user(page, len, PAGE_SIZE - len);
2171                         len = 0;
2172                 }
2173                 length = cifs_read_page_from_socket(server, page, n);
2174                 if (length < 0)
2175                         return length;
2176                 server->total_read += length;
2177         }
2178
2179         return 0;
2180 }
2181
2182 static int
2183 init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
2184                unsigned int cur_off, struct bio_vec **page_vec)
2185 {
2186         struct bio_vec *bvec;
2187         int i;
2188
2189         bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
2190         if (!bvec)
2191                 return -ENOMEM;
2192
2193         for (i = 0; i < npages; i++) {
2194                 bvec[i].bv_page = pages[i];
2195                 bvec[i].bv_offset = (i == 0) ? cur_off : 0;
2196                 bvec[i].bv_len = min_t(unsigned int, PAGE_SIZE, data_size);
2197                 data_size -= bvec[i].bv_len;
2198         }
2199
2200         if (data_size != 0) {
2201                 cifs_dbg(VFS, "%s: something went wrong\n", __func__);
2202                 kfree(bvec);
2203                 return -EIO;
2204         }
2205
2206         *page_vec = bvec;
2207         return 0;
2208 }
2209
2210 static int
2211 handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
2212                  char *buf, unsigned int buf_len, struct page **pages,
2213                  unsigned int npages, unsigned int page_data_size)
2214 {
2215         unsigned int data_offset;
2216         unsigned int data_len;
2217         unsigned int cur_off;
2218         unsigned int cur_page_idx;
2219         unsigned int pad_len;
2220         struct cifs_readdata *rdata = mid->callback_data;
2221         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
2222         struct bio_vec *bvec = NULL;
2223         struct iov_iter iter;
2224         struct kvec iov;
2225         int length;
2226
2227         if (shdr->Command != SMB2_READ) {
2228                 cifs_dbg(VFS, "only big read responses are supported\n");
2229                 return -ENOTSUPP;
2230         }
2231
2232         if (server->ops->is_session_expired &&
2233             server->ops->is_session_expired(buf)) {
2234                 cifs_reconnect(server);
2235                 wake_up(&server->response_q);
2236                 return -1;
2237         }
2238
2239         if (server->ops->is_status_pending &&
2240                         server->ops->is_status_pending(buf, server, 0))
2241                 return -1;
2242
2243         rdata->result = server->ops->map_error(buf, false);
2244         if (rdata->result != 0) {
2245                 cifs_dbg(FYI, "%s: server returned error %d\n",
2246                          __func__, rdata->result);
2247                 dequeue_mid(mid, rdata->result);
2248                 return 0;
2249         }
2250
2251         data_offset = server->ops->read_data_offset(buf) + 4;
2252         data_len = server->ops->read_data_length(buf);
2253
2254         if (data_offset < server->vals->read_rsp_size) {
2255                 /*
2256                  * win2k8 sometimes sends an offset of 0 when the read
2257                  * is beyond the EOF. Treat it as if the data starts just after
2258                  * the header.
2259                  */
2260                 cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
2261                          __func__, data_offset);
2262                 data_offset = server->vals->read_rsp_size;
2263         } else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
2264                 /* data_offset is beyond the end of smallbuf */
2265                 cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
2266                          __func__, data_offset);
2267                 rdata->result = -EIO;
2268                 dequeue_mid(mid, rdata->result);
2269                 return 0;
2270         }
2271
2272         pad_len = data_offset - server->vals->read_rsp_size;
2273
2274         if (buf_len <= data_offset) {
2275                 /* read response payload is in pages */
2276                 cur_page_idx = pad_len / PAGE_SIZE;
2277                 cur_off = pad_len % PAGE_SIZE;
2278
2279                 if (cur_page_idx != 0) {
2280                         /* data offset is beyond the 1st page of response */
2281                         cifs_dbg(FYI, "%s: data offset (%u) beyond 1st page of response\n",
2282                                  __func__, data_offset);
2283                         rdata->result = -EIO;
2284                         dequeue_mid(mid, rdata->result);
2285                         return 0;
2286                 }
2287
2288                 if (data_len > page_data_size - pad_len) {
2289                         /* data_len is corrupt -- discard frame */
2290                         rdata->result = -EIO;
2291                         dequeue_mid(mid, rdata->result);
2292                         return 0;
2293                 }
2294
2295                 rdata->result = init_read_bvec(pages, npages, page_data_size,
2296                                                cur_off, &bvec);
2297                 if (rdata->result != 0) {
2298                         dequeue_mid(mid, rdata->result);
2299                         return 0;
2300                 }
2301
2302                 iov_iter_bvec(&iter, WRITE | ITER_BVEC, bvec, npages, data_len);
2303         } else if (buf_len >= data_offset + data_len) {
2304                 /* read response payload is in buf */
2305                 WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
2306                 iov.iov_base = buf + data_offset;
2307                 iov.iov_len = data_len;
2308                 iov_iter_kvec(&iter, WRITE | ITER_KVEC, &iov, 1, data_len);
2309         } else {
2310                 /* read response payload cannot be in both buf and pages */
2311                 WARN_ONCE(1, "buf can not contain only a part of read data");
2312                 rdata->result = -EIO;
2313                 dequeue_mid(mid, rdata->result);
2314                 return 0;
2315         }
2316
2317         /* set up first iov for signature check */
2318         rdata->iov[0].iov_base = buf;
2319         rdata->iov[0].iov_len = 4;
2320         rdata->iov[1].iov_base = buf + 4;
2321         rdata->iov[1].iov_len = server->vals->read_rsp_size - 4;
2322         cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
2323                  rdata->iov[0].iov_base, server->vals->read_rsp_size);
2324
2325         length = rdata->copy_into_pages(server, rdata, &iter);
2326
2327         kfree(bvec);
2328
2329         if (length < 0)
2330                 return length;
2331
2332         dequeue_mid(mid, false);
2333         return length;
2334 }
2335
2336 static int
2337 receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid)
2338 {
2339         char *buf = server->smallbuf;
2340         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
2341         unsigned int npages;
2342         struct page **pages;
2343         unsigned int len;
2344         unsigned int buflen = get_rfc1002_length(buf) + 4;
2345         int rc;
2346         int i = 0;
2347
2348         len = min_t(unsigned int, buflen, server->vals->read_rsp_size - 4 +
2349                 sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
2350
2351         rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
2352         if (rc < 0)
2353                 return rc;
2354         server->total_read += rc;
2355
2356         len = le32_to_cpu(tr_hdr->OriginalMessageSize) + 4 -
2357                                                 server->vals->read_rsp_size;
2358         npages = DIV_ROUND_UP(len, PAGE_SIZE);
2359
2360         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
2361         if (!pages) {
2362                 rc = -ENOMEM;
2363                 goto discard_data;
2364         }
2365
2366         for (; i < npages; i++) {
2367                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2368                 if (!pages[i]) {
2369                         rc = -ENOMEM;
2370                         goto discard_data;
2371                 }
2372         }
2373
2374         /* read read data into pages */
2375         rc = read_data_into_pages(server, pages, npages, len);
2376         if (rc)
2377                 goto free_pages;
2378
2379         rc = cifs_discard_remaining_data(server);
2380         if (rc)
2381                 goto free_pages;
2382
2383         rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size - 4,
2384                               pages, npages, len);
2385         if (rc)
2386                 goto free_pages;
2387
2388         *mid = smb2_find_mid(server, buf);
2389         if (*mid == NULL)
2390                 cifs_dbg(FYI, "mid not found\n");
2391         else {
2392                 cifs_dbg(FYI, "mid found\n");
2393                 (*mid)->decrypted = true;
2394                 rc = handle_read_data(server, *mid, buf,
2395                                       server->vals->read_rsp_size,
2396                                       pages, npages, len);
2397         }
2398
2399 free_pages:
2400         for (i = i - 1; i >= 0; i--)
2401                 put_page(pages[i]);
2402         kfree(pages);
2403         return rc;
2404 discard_data:
2405         cifs_discard_remaining_data(server);
2406         goto free_pages;
2407 }
2408
2409 static int
2410 receive_encrypted_standard(struct TCP_Server_Info *server,
2411                            struct mid_q_entry **mid)
2412 {
2413         int length;
2414         char *buf = server->smallbuf;
2415         unsigned int pdu_length = get_rfc1002_length(buf);
2416         unsigned int buf_size;
2417         struct mid_q_entry *mid_entry;
2418
2419         /* switch to large buffer if too big for a small one */
2420         if (pdu_length + 4 > MAX_CIFS_SMALL_BUFFER_SIZE) {
2421                 server->large_buf = true;
2422                 memcpy(server->bigbuf, buf, server->total_read);
2423                 buf = server->bigbuf;
2424         }
2425
2426         /* now read the rest */
2427         length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
2428                                 pdu_length - HEADER_SIZE(server) + 1 + 4);
2429         if (length < 0)
2430                 return length;
2431         server->total_read += length;
2432
2433         buf_size = pdu_length + 4 - sizeof(struct smb2_transform_hdr);
2434         length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0);
2435         if (length)
2436                 return length;
2437
2438         mid_entry = smb2_find_mid(server, buf);
2439         if (mid_entry == NULL)
2440                 cifs_dbg(FYI, "mid not found\n");
2441         else {
2442                 cifs_dbg(FYI, "mid found\n");
2443                 mid_entry->decrypted = true;
2444         }
2445
2446         *mid = mid_entry;
2447
2448         if (mid_entry && mid_entry->handle)
2449                 return mid_entry->handle(server, mid_entry);
2450
2451         return cifs_handle_standard(server, mid_entry);
2452 }
2453
2454 static int
2455 smb3_receive_transform(struct TCP_Server_Info *server, struct mid_q_entry **mid)
2456 {
2457         char *buf = server->smallbuf;
2458         unsigned int pdu_length = get_rfc1002_length(buf);
2459         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
2460         unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
2461
2462         if (pdu_length + 4 < sizeof(struct smb2_transform_hdr) +
2463                                                 sizeof(struct smb2_sync_hdr)) {
2464                 cifs_dbg(VFS, "Transform message is too small (%u)\n",
2465                          pdu_length);
2466                 cifs_reconnect(server);
2467                 wake_up(&server->response_q);
2468                 return -ECONNABORTED;
2469         }
2470
2471         if (pdu_length + 4 < orig_len + sizeof(struct smb2_transform_hdr)) {
2472                 cifs_dbg(VFS, "Transform message is broken\n");
2473                 cifs_reconnect(server);
2474                 wake_up(&server->response_q);
2475                 return -ECONNABORTED;
2476         }
2477
2478         if (pdu_length + 4 > CIFSMaxBufSize + MAX_HEADER_SIZE(server))
2479                 return receive_encrypted_read(server, mid);
2480
2481         return receive_encrypted_standard(server, mid);
2482 }
2483
2484 int
2485 smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
2486 {
2487         char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
2488
2489         return handle_read_data(server, mid, buf, get_rfc1002_length(buf) + 4,
2490                                 NULL, 0, 0);
2491 }
2492
2493 struct smb_version_operations smb20_operations = {
2494         .compare_fids = smb2_compare_fids,
2495         .setup_request = smb2_setup_request,
2496         .setup_async_request = smb2_setup_async_request,
2497         .check_receive = smb2_check_receive,
2498         .add_credits = smb2_add_credits,
2499         .set_credits = smb2_set_credits,
2500         .get_credits_field = smb2_get_credits_field,
2501         .get_credits = smb2_get_credits,
2502         .wait_mtu_credits = cifs_wait_mtu_credits,
2503         .get_next_mid = smb2_get_next_mid,
2504         .read_data_offset = smb2_read_data_offset,
2505         .read_data_length = smb2_read_data_length,
2506         .map_error = map_smb2_to_linux_error,
2507         .find_mid = smb2_find_mid,
2508         .check_message = smb2_check_message,
2509         .dump_detail = smb2_dump_detail,
2510         .clear_stats = smb2_clear_stats,
2511         .print_stats = smb2_print_stats,
2512         .is_oplock_break = smb2_is_valid_oplock_break,
2513         .handle_cancelled_mid = smb2_handle_cancelled_mid,
2514         .downgrade_oplock = smb2_downgrade_oplock,
2515         .need_neg = smb2_need_neg,
2516         .negotiate = smb2_negotiate,
2517         .negotiate_wsize = smb2_negotiate_wsize,
2518         .negotiate_rsize = smb2_negotiate_rsize,
2519         .sess_setup = SMB2_sess_setup,
2520         .logoff = SMB2_logoff,
2521         .tree_connect = SMB2_tcon,
2522         .tree_disconnect = SMB2_tdis,
2523         .qfs_tcon = smb2_qfs_tcon,
2524         .is_path_accessible = smb2_is_path_accessible,
2525         .can_echo = smb2_can_echo,
2526         .echo = SMB2_echo,
2527         .query_path_info = smb2_query_path_info,
2528         .get_srv_inum = smb2_get_srv_inum,
2529         .query_file_info = smb2_query_file_info,
2530         .set_path_size = smb2_set_path_size,
2531         .set_file_size = smb2_set_file_size,
2532         .set_file_info = smb2_set_file_info,
2533         .set_compression = smb2_set_compression,
2534         .mkdir = smb2_mkdir,
2535         .mkdir_setinfo = smb2_mkdir_setinfo,
2536         .rmdir = smb2_rmdir,
2537         .unlink = smb2_unlink,
2538         .rename = smb2_rename_path,
2539         .create_hardlink = smb2_create_hardlink,
2540         .query_symlink = smb2_query_symlink,
2541         .query_mf_symlink = smb3_query_mf_symlink,
2542         .create_mf_symlink = smb3_create_mf_symlink,
2543         .open = smb2_open_file,
2544         .set_fid = smb2_set_fid,
2545         .close = smb2_close_file,
2546         .flush = smb2_flush_file,
2547         .async_readv = smb2_async_readv,
2548         .async_writev = smb2_async_writev,
2549         .sync_read = smb2_sync_read,
2550         .sync_write = smb2_sync_write,
2551         .query_dir_first = smb2_query_dir_first,
2552         .query_dir_next = smb2_query_dir_next,
2553         .close_dir = smb2_close_dir,
2554         .calc_smb_size = smb2_calc_size,
2555         .is_status_pending = smb2_is_status_pending,
2556         .is_session_expired = smb2_is_session_expired,
2557         .oplock_response = smb2_oplock_response,
2558         .queryfs = smb2_queryfs,
2559         .mand_lock = smb2_mand_lock,
2560         .mand_unlock_range = smb2_unlock_range,
2561         .push_mand_locks = smb2_push_mandatory_locks,
2562         .get_lease_key = smb2_get_lease_key,
2563         .set_lease_key = smb2_set_lease_key,
2564         .new_lease_key = smb2_new_lease_key,
2565         .calc_signature = smb2_calc_signature,
2566         .is_read_op = smb2_is_read_op,
2567         .set_oplock_level = smb2_set_oplock_level,
2568         .create_lease_buf = smb2_create_lease_buf,
2569         .parse_lease_buf = smb2_parse_lease_buf,
2570         .copychunk_range = smb2_copychunk_range,
2571         .wp_retry_size = smb2_wp_retry_size,
2572         .dir_needs_close = smb2_dir_needs_close,
2573         .get_dfs_refer = smb2_get_dfs_refer,
2574         .select_sectype = smb2_select_sectype,
2575 #ifdef CONFIG_CIFS_ACL
2576         .get_acl = get_smb2_acl,
2577         .get_acl_by_fid = get_smb2_acl_by_fid,
2578         .set_acl = set_smb2_acl,
2579 #endif /* CIFS_ACL */
2580 };
2581
2582 struct smb_version_operations smb21_operations = {
2583         .compare_fids = smb2_compare_fids,
2584         .setup_request = smb2_setup_request,
2585         .setup_async_request = smb2_setup_async_request,
2586         .check_receive = smb2_check_receive,
2587         .add_credits = smb2_add_credits,
2588         .set_credits = smb2_set_credits,
2589         .get_credits_field = smb2_get_credits_field,
2590         .get_credits = smb2_get_credits,
2591         .wait_mtu_credits = smb2_wait_mtu_credits,
2592         .get_next_mid = smb2_get_next_mid,
2593         .read_data_offset = smb2_read_data_offset,
2594         .read_data_length = smb2_read_data_length,
2595         .map_error = map_smb2_to_linux_error,
2596         .find_mid = smb2_find_mid,
2597         .check_message = smb2_check_message,
2598         .dump_detail = smb2_dump_detail,
2599         .clear_stats = smb2_clear_stats,
2600         .print_stats = smb2_print_stats,
2601         .is_oplock_break = smb2_is_valid_oplock_break,
2602         .handle_cancelled_mid = smb2_handle_cancelled_mid,
2603         .downgrade_oplock = smb2_downgrade_oplock,
2604         .need_neg = smb2_need_neg,
2605         .negotiate = smb2_negotiate,
2606         .negotiate_wsize = smb2_negotiate_wsize,
2607         .negotiate_rsize = smb2_negotiate_rsize,
2608         .sess_setup = SMB2_sess_setup,
2609         .logoff = SMB2_logoff,
2610         .tree_connect = SMB2_tcon,
2611         .tree_disconnect = SMB2_tdis,
2612         .qfs_tcon = smb2_qfs_tcon,
2613         .is_path_accessible = smb2_is_path_accessible,
2614         .can_echo = smb2_can_echo,
2615         .echo = SMB2_echo,
2616         .query_path_info = smb2_query_path_info,
2617         .get_srv_inum = smb2_get_srv_inum,
2618         .query_file_info = smb2_query_file_info,
2619         .set_path_size = smb2_set_path_size,
2620         .set_file_size = smb2_set_file_size,
2621         .set_file_info = smb2_set_file_info,
2622         .set_compression = smb2_set_compression,
2623         .mkdir = smb2_mkdir,
2624         .mkdir_setinfo = smb2_mkdir_setinfo,
2625         .rmdir = smb2_rmdir,
2626         .unlink = smb2_unlink,
2627         .rename = smb2_rename_path,
2628         .create_hardlink = smb2_create_hardlink,
2629         .query_symlink = smb2_query_symlink,
2630         .query_mf_symlink = smb3_query_mf_symlink,
2631         .create_mf_symlink = smb3_create_mf_symlink,
2632         .open = smb2_open_file,
2633         .set_fid = smb2_set_fid,
2634         .close = smb2_close_file,
2635         .flush = smb2_flush_file,
2636         .async_readv = smb2_async_readv,
2637         .async_writev = smb2_async_writev,
2638         .sync_read = smb2_sync_read,
2639         .sync_write = smb2_sync_write,
2640         .query_dir_first = smb2_query_dir_first,
2641         .query_dir_next = smb2_query_dir_next,
2642         .close_dir = smb2_close_dir,
2643         .calc_smb_size = smb2_calc_size,
2644         .is_status_pending = smb2_is_status_pending,
2645         .is_session_expired = smb2_is_session_expired,
2646         .oplock_response = smb2_oplock_response,
2647         .queryfs = smb2_queryfs,
2648         .mand_lock = smb2_mand_lock,
2649         .mand_unlock_range = smb2_unlock_range,
2650         .push_mand_locks = smb2_push_mandatory_locks,
2651         .get_lease_key = smb2_get_lease_key,
2652         .set_lease_key = smb2_set_lease_key,
2653         .new_lease_key = smb2_new_lease_key,
2654         .calc_signature = smb2_calc_signature,
2655         .is_read_op = smb21_is_read_op,
2656         .set_oplock_level = smb21_set_oplock_level,
2657         .create_lease_buf = smb2_create_lease_buf,
2658         .parse_lease_buf = smb2_parse_lease_buf,
2659         .copychunk_range = smb2_copychunk_range,
2660         .wp_retry_size = smb2_wp_retry_size,
2661         .dir_needs_close = smb2_dir_needs_close,
2662         .enum_snapshots = smb3_enum_snapshots,
2663         .get_dfs_refer = smb2_get_dfs_refer,
2664         .select_sectype = smb2_select_sectype,
2665 #ifdef CONFIG_CIFS_ACL
2666         .get_acl = get_smb2_acl,
2667         .get_acl_by_fid = get_smb2_acl_by_fid,
2668         .set_acl = set_smb2_acl,
2669 #endif /* CIFS_ACL */
2670 };
2671
2672 struct smb_version_operations smb30_operations = {
2673         .compare_fids = smb2_compare_fids,
2674         .setup_request = smb2_setup_request,
2675         .setup_async_request = smb2_setup_async_request,
2676         .check_receive = smb2_check_receive,
2677         .add_credits = smb2_add_credits,
2678         .set_credits = smb2_set_credits,
2679         .get_credits_field = smb2_get_credits_field,
2680         .get_credits = smb2_get_credits,
2681         .wait_mtu_credits = smb2_wait_mtu_credits,
2682         .get_next_mid = smb2_get_next_mid,
2683         .read_data_offset = smb2_read_data_offset,
2684         .read_data_length = smb2_read_data_length,
2685         .map_error = map_smb2_to_linux_error,
2686         .find_mid = smb2_find_mid,
2687         .check_message = smb2_check_message,
2688         .dump_detail = smb2_dump_detail,
2689         .clear_stats = smb2_clear_stats,
2690         .print_stats = smb2_print_stats,
2691         .dump_share_caps = smb2_dump_share_caps,
2692         .is_oplock_break = smb2_is_valid_oplock_break,
2693         .handle_cancelled_mid = smb2_handle_cancelled_mid,
2694         .downgrade_oplock = smb2_downgrade_oplock,
2695         .need_neg = smb2_need_neg,
2696         .negotiate = smb2_negotiate,
2697         .negotiate_wsize = smb2_negotiate_wsize,
2698         .negotiate_rsize = smb2_negotiate_rsize,
2699         .sess_setup = SMB2_sess_setup,
2700         .logoff = SMB2_logoff,
2701         .tree_connect = SMB2_tcon,
2702         .tree_disconnect = SMB2_tdis,
2703         .qfs_tcon = smb3_qfs_tcon,
2704         .is_path_accessible = smb2_is_path_accessible,
2705         .can_echo = smb2_can_echo,
2706         .echo = SMB2_echo,
2707         .query_path_info = smb2_query_path_info,
2708         .get_srv_inum = smb2_get_srv_inum,
2709         .query_file_info = smb2_query_file_info,
2710         .set_path_size = smb2_set_path_size,
2711         .set_file_size = smb2_set_file_size,
2712         .set_file_info = smb2_set_file_info,
2713         .set_compression = smb2_set_compression,
2714         .mkdir = smb2_mkdir,
2715         .mkdir_setinfo = smb2_mkdir_setinfo,
2716         .rmdir = smb2_rmdir,
2717         .unlink = smb2_unlink,
2718         .rename = smb2_rename_path,
2719         .create_hardlink = smb2_create_hardlink,
2720         .query_symlink = smb2_query_symlink,
2721         .query_mf_symlink = smb3_query_mf_symlink,
2722         .create_mf_symlink = smb3_create_mf_symlink,
2723         .open = smb2_open_file,
2724         .set_fid = smb2_set_fid,
2725         .close = smb2_close_file,
2726         .flush = smb2_flush_file,
2727         .async_readv = smb2_async_readv,
2728         .async_writev = smb2_async_writev,
2729         .sync_read = smb2_sync_read,
2730         .sync_write = smb2_sync_write,
2731         .query_dir_first = smb2_query_dir_first,
2732         .query_dir_next = smb2_query_dir_next,
2733         .close_dir = smb2_close_dir,
2734         .calc_smb_size = smb2_calc_size,
2735         .is_status_pending = smb2_is_status_pending,
2736         .is_session_expired = smb2_is_session_expired,
2737         .oplock_response = smb2_oplock_response,
2738         .queryfs = smb2_queryfs,
2739         .mand_lock = smb2_mand_lock,
2740         .mand_unlock_range = smb2_unlock_range,
2741         .push_mand_locks = smb2_push_mandatory_locks,
2742         .get_lease_key = smb2_get_lease_key,
2743         .set_lease_key = smb2_set_lease_key,
2744         .new_lease_key = smb2_new_lease_key,
2745         .generate_signingkey = generate_smb30signingkey,
2746         .calc_signature = smb3_calc_signature,
2747         .set_integrity  = smb3_set_integrity,
2748         .is_read_op = smb21_is_read_op,
2749         .set_oplock_level = smb3_set_oplock_level,
2750         .create_lease_buf = smb3_create_lease_buf,
2751         .parse_lease_buf = smb3_parse_lease_buf,
2752         .copychunk_range = smb2_copychunk_range,
2753         .duplicate_extents = smb2_duplicate_extents,
2754         .validate_negotiate = smb3_validate_negotiate,
2755         .wp_retry_size = smb2_wp_retry_size,
2756         .dir_needs_close = smb2_dir_needs_close,
2757         .fallocate = smb3_fallocate,
2758         .enum_snapshots = smb3_enum_snapshots,
2759         .init_transform_rq = smb3_init_transform_rq,
2760         .free_transform_rq = smb3_free_transform_rq,
2761         .is_transform_hdr = smb3_is_transform_hdr,
2762         .receive_transform = smb3_receive_transform,
2763         .get_dfs_refer = smb2_get_dfs_refer,
2764         .select_sectype = smb2_select_sectype,
2765 #ifdef CONFIG_CIFS_ACL
2766         .get_acl = get_smb2_acl,
2767         .get_acl_by_fid = get_smb2_acl_by_fid,
2768         .set_acl = set_smb2_acl,
2769 #endif /* CIFS_ACL */
2770 };
2771
2772 #ifdef CONFIG_CIFS_SMB311
2773 struct smb_version_operations smb311_operations = {
2774         .compare_fids = smb2_compare_fids,
2775         .setup_request = smb2_setup_request,
2776         .setup_async_request = smb2_setup_async_request,
2777         .check_receive = smb2_check_receive,
2778         .add_credits = smb2_add_credits,
2779         .set_credits = smb2_set_credits,
2780         .get_credits_field = smb2_get_credits_field,
2781         .get_credits = smb2_get_credits,
2782         .wait_mtu_credits = smb2_wait_mtu_credits,
2783         .get_next_mid = smb2_get_next_mid,
2784         .read_data_offset = smb2_read_data_offset,
2785         .read_data_length = smb2_read_data_length,
2786         .map_error = map_smb2_to_linux_error,
2787         .find_mid = smb2_find_mid,
2788         .check_message = smb2_check_message,
2789         .dump_detail = smb2_dump_detail,
2790         .clear_stats = smb2_clear_stats,
2791         .print_stats = smb2_print_stats,
2792         .dump_share_caps = smb2_dump_share_caps,
2793         .is_oplock_break = smb2_is_valid_oplock_break,
2794         .handle_cancelled_mid = smb2_handle_cancelled_mid,
2795         .downgrade_oplock = smb2_downgrade_oplock,
2796         .need_neg = smb2_need_neg,
2797         .negotiate = smb2_negotiate,
2798         .negotiate_wsize = smb2_negotiate_wsize,
2799         .negotiate_rsize = smb2_negotiate_rsize,
2800         .sess_setup = SMB2_sess_setup,
2801         .logoff = SMB2_logoff,
2802         .tree_connect = SMB2_tcon,
2803         .tree_disconnect = SMB2_tdis,
2804         .qfs_tcon = smb3_qfs_tcon,
2805         .is_path_accessible = smb2_is_path_accessible,
2806         .can_echo = smb2_can_echo,
2807         .echo = SMB2_echo,
2808         .query_path_info = smb2_query_path_info,
2809         .get_srv_inum = smb2_get_srv_inum,
2810         .query_file_info = smb2_query_file_info,
2811         .set_path_size = smb2_set_path_size,
2812         .set_file_size = smb2_set_file_size,
2813         .set_file_info = smb2_set_file_info,
2814         .set_compression = smb2_set_compression,
2815         .mkdir = smb2_mkdir,
2816         .mkdir_setinfo = smb2_mkdir_setinfo,
2817         .rmdir = smb2_rmdir,
2818         .unlink = smb2_unlink,
2819         .rename = smb2_rename_path,
2820         .create_hardlink = smb2_create_hardlink,
2821         .query_symlink = smb2_query_symlink,
2822         .query_mf_symlink = smb3_query_mf_symlink,
2823         .create_mf_symlink = smb3_create_mf_symlink,
2824         .open = smb2_open_file,
2825         .set_fid = smb2_set_fid,
2826         .close = smb2_close_file,
2827         .flush = smb2_flush_file,
2828         .async_readv = smb2_async_readv,
2829         .async_writev = smb2_async_writev,
2830         .sync_read = smb2_sync_read,
2831         .sync_write = smb2_sync_write,
2832         .query_dir_first = smb2_query_dir_first,
2833         .query_dir_next = smb2_query_dir_next,
2834         .close_dir = smb2_close_dir,
2835         .calc_smb_size = smb2_calc_size,
2836         .is_status_pending = smb2_is_status_pending,
2837         .is_session_expired = smb2_is_session_expired,
2838         .oplock_response = smb2_oplock_response,
2839         .queryfs = smb2_queryfs,
2840         .mand_lock = smb2_mand_lock,
2841         .mand_unlock_range = smb2_unlock_range,
2842         .push_mand_locks = smb2_push_mandatory_locks,
2843         .get_lease_key = smb2_get_lease_key,
2844         .set_lease_key = smb2_set_lease_key,
2845         .new_lease_key = smb2_new_lease_key,
2846         .generate_signingkey = generate_smb311signingkey,
2847         .calc_signature = smb3_calc_signature,
2848         .set_integrity  = smb3_set_integrity,
2849         .is_read_op = smb21_is_read_op,
2850         .set_oplock_level = smb3_set_oplock_level,
2851         .create_lease_buf = smb3_create_lease_buf,
2852         .parse_lease_buf = smb3_parse_lease_buf,
2853         .copychunk_range = smb2_copychunk_range,
2854         .duplicate_extents = smb2_duplicate_extents,
2855 /*      .validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
2856         .wp_retry_size = smb2_wp_retry_size,
2857         .dir_needs_close = smb2_dir_needs_close,
2858         .fallocate = smb3_fallocate,
2859         .enum_snapshots = smb3_enum_snapshots,
2860         .init_transform_rq = smb3_init_transform_rq,
2861         .free_transform_rq = smb3_free_transform_rq,
2862         .is_transform_hdr = smb3_is_transform_hdr,
2863         .receive_transform = smb3_receive_transform,
2864         .get_dfs_refer = smb2_get_dfs_refer,
2865         .select_sectype = smb2_select_sectype,
2866 };
2867 #endif /* CIFS_SMB311 */
2868
2869 struct smb_version_values smb20_values = {
2870         .version_string = SMB20_VERSION_STRING,
2871         .protocol_id = SMB20_PROT_ID,
2872         .req_capabilities = 0, /* MBZ */
2873         .large_lock_type = 0,
2874         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
2875         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
2876         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
2877         .header_size = sizeof(struct smb2_hdr),
2878         .max_header_size = MAX_SMB2_HDR_SIZE,
2879         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
2880         .lock_cmd = SMB2_LOCK,
2881         .cap_unix = 0,
2882         .cap_nt_find = SMB2_NT_FIND,
2883         .cap_large_files = SMB2_LARGE_FILES,
2884         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
2885         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
2886         .create_lease_size = sizeof(struct create_lease),
2887 };
2888
2889 struct smb_version_values smb21_values = {
2890         .version_string = SMB21_VERSION_STRING,
2891         .protocol_id = SMB21_PROT_ID,
2892         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
2893         .large_lock_type = 0,
2894         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
2895         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
2896         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
2897         .header_size = sizeof(struct smb2_hdr),
2898         .max_header_size = MAX_SMB2_HDR_SIZE,
2899         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
2900         .lock_cmd = SMB2_LOCK,
2901         .cap_unix = 0,
2902         .cap_nt_find = SMB2_NT_FIND,
2903         .cap_large_files = SMB2_LARGE_FILES,
2904         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
2905         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
2906         .create_lease_size = sizeof(struct create_lease),
2907 };
2908
2909 struct smb_version_values smb30_values = {
2910         .version_string = SMB30_VERSION_STRING,
2911         .protocol_id = SMB30_PROT_ID,
2912         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
2913         .large_lock_type = 0,
2914         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
2915         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
2916         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
2917         .header_size = sizeof(struct smb2_hdr),
2918         .max_header_size = MAX_SMB2_HDR_SIZE,
2919         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
2920         .lock_cmd = SMB2_LOCK,
2921         .cap_unix = 0,
2922         .cap_nt_find = SMB2_NT_FIND,
2923         .cap_large_files = SMB2_LARGE_FILES,
2924         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
2925         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
2926         .create_lease_size = sizeof(struct create_lease_v2),
2927 };
2928
2929 struct smb_version_values smb302_values = {
2930         .version_string = SMB302_VERSION_STRING,
2931         .protocol_id = SMB302_PROT_ID,
2932         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
2933         .large_lock_type = 0,
2934         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
2935         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
2936         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
2937         .header_size = sizeof(struct smb2_hdr),
2938         .max_header_size = MAX_SMB2_HDR_SIZE,
2939         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
2940         .lock_cmd = SMB2_LOCK,
2941         .cap_unix = 0,
2942         .cap_nt_find = SMB2_NT_FIND,
2943         .cap_large_files = SMB2_LARGE_FILES,
2944         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
2945         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
2946         .create_lease_size = sizeof(struct create_lease_v2),
2947 };
2948
2949 #ifdef CONFIG_CIFS_SMB311
2950 struct smb_version_values smb311_values = {
2951         .version_string = SMB311_VERSION_STRING,
2952         .protocol_id = SMB311_PROT_ID,
2953         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
2954         .large_lock_type = 0,
2955         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
2956         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
2957         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
2958         .header_size = sizeof(struct smb2_hdr),
2959         .max_header_size = MAX_SMB2_HDR_SIZE,
2960         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
2961         .lock_cmd = SMB2_LOCK,
2962         .cap_unix = 0,
2963         .cap_nt_find = SMB2_NT_FIND,
2964         .cap_large_files = SMB2_LARGE_FILES,
2965         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
2966         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
2967         .create_lease_size = sizeof(struct create_lease_v2),
2968 };
2969 #endif /* SMB311 */