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 "cifsglob.h"
  23 #include "smb2pdu.h"
  24 #include "smb2proto.h"
  25 #include "cifsproto.h"
  26 #include "cifs_debug.h"
  27 #include "cifs_unicode.h"
  28 #include "smb2status.h"
  29 #include "smb2glob.h"
  30
  31 static int
  32 change_conf(struct TCP_Server_Info *server)
  33 {
  34         server->credits += server->echo_credits + server->oplock_credits;
  35         server->oplock_credits = server->echo_credits = 0;
  36         switch (server->credits) {
  37         case 0:
  38                 return -1;
  39         case 1:
  40                 server->echoes = false;
  41                 server->oplocks = false;
  42                 cifs_dbg(VFS, "disabling echoes and oplocks\n");
  43                 break;
  44         case 2:
  45                 server->echoes = true;
  46                 server->oplocks = false;
  47                 server->echo_credits = 1;
  48                 cifs_dbg(FYI, "disabling oplocks\n");
  49                 break;
  50         default:
  51                 server->echoes = true;
  52                 server->oplocks = true;
  53                 server->echo_credits = 1;
  54                 server->oplock_credits = 1;
  55         }
  56         server->credits -= server->echo_credits + server->oplock_credits;
  57         return 0;
  58 }
  59
  60 static void
  61 smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
  62                  const int optype)
  63 {
  64         int *val, rc = 0;
  65         spin_lock(&server->req_lock);
  66         val = server->ops->get_credits_field(server, optype);
  67         *val += add;
  68         server->in_flight--;
  69         if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
  70                 rc = change_conf(server);
  71         /*
  72          * Sometimes server returns 0 credits on oplock break ack - we need to
  73          * rebalance credits in this case.
  74          */
  75         else if (server->in_flight > 0 && server->oplock_credits == 0 &&
  76                  server->oplocks) {
  77                 if (server->credits > 1) {
  78                         server->credits--;
  79                         server->oplock_credits++;
  80                 }
  81         }
  82         spin_unlock(&server->req_lock);
  83         wake_up(&server->request_q);
  84         if (rc)
  85                 cifs_reconnect(server);
  86 }
  87
  88 static void
  89 smb2_set_credits(struct TCP_Server_Info *server, const int val)
  90 {
  91         spin_lock(&server->req_lock);
  92         server->credits = val;
  93         spin_unlock(&server->req_lock);
  94 }
  95
  96 static int *
  97 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
  98 {
  99         switch (optype) {
 100         case CIFS_ECHO_OP:
 101                 return &server->echo_credits;
 102         case CIFS_OBREAK_OP:
 103                 return &server->oplock_credits;
 104         default:
 105                 return &server->credits;
 106         }
 107 }
 108
 109 static unsigned int
 110 smb2_get_credits(struct mid_q_entry *mid)
 111 {
 112         return le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest);
 113 }
 114
 115 static int
 116 smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
 117                       unsigned int *num, unsigned int *credits)
 118 {
 119         int rc = 0;
 120         unsigned int scredits;
 121
 122         spin_lock(&server->req_lock);
 123         while (1) {
 124                 if (server->credits <= 0) {
 125                         spin_unlock(&server->req_lock);
 126                         cifs_num_waiters_inc(server);
 127                         rc = wait_event_killable(server->request_q,
 128                                         has_credits(server, &server->credits));
 129                         cifs_num_waiters_dec(server);
 130                         if (rc)
 131                                 return rc;
 132                         spin_lock(&server->req_lock);
 133                 } else {
 134                         if (server->tcpStatus == CifsExiting) {
 135                                 spin_unlock(&server->req_lock);
 136                                 return -ENOENT;
 137                         }
 138
 139                         scredits = server->credits;
 140                         /* can deadlock with reopen */
 141                         if (scredits == 1) {
 142                                 *num = SMB2_MAX_BUFFER_SIZE;
 143                                 *credits = 0;
 144                                 break;
 145                         }
 146
 147                         /* leave one credit for a possible reopen */
 148                         scredits--;
 149                         *num = min_t(unsigned int, size,
 150                                      scredits * SMB2_MAX_BUFFER_SIZE);
 151
 152                         *credits = DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
 153                         server->credits -= *credits;
 154                         server->in_flight++;
 155                         break;
 156                 }
 157         }
 158         spin_unlock(&server->req_lock);
 159         return rc;
 160 }
 161
 162 static __u64
 163 smb2_get_next_mid(struct TCP_Server_Info *server)
 164 {
 165         __u64 mid;
 166         /* for SMB2 we need the current value */
 167         spin_lock(&GlobalMid_Lock);
 168         mid = server->CurrentMid++;
 169         spin_unlock(&GlobalMid_Lock);
 170         return mid;
 171 }
 172
 173 static struct mid_q_entry *
 174 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
 175 {
 176         struct mid_q_entry *mid;
 177         struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
 178
 179         spin_lock(&GlobalMid_Lock);
 180         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 181                 if ((mid->mid == hdr->MessageId) &&
 182                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
 183                     (mid->command == hdr->Command)) {
 184                         spin_unlock(&GlobalMid_Lock);
 185                         return mid;
 186                 }
 187         }
 188         spin_unlock(&GlobalMid_Lock);
 189         return NULL;
 190 }
 191
 192 static void
 193 smb2_dump_detail(void *buf)
 194 {
 195 #ifdef CONFIG_CIFS_DEBUG2
 196         struct smb2_hdr *smb = (struct smb2_hdr *)buf;
 197
 198         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
 199                  smb->Command, smb->Status, smb->Flags, smb->MessageId,
 200                  smb->ProcessId);
 201         cifs_dbg(VFS, "smb buf %p len %u\n", smb, smb2_calc_size(smb));
 202 #endif
 203 }
 204
 205 static bool
 206 smb2_need_neg(struct TCP_Server_Info *server)
 207 {
 208         return server->max_read == 0;
 209 }
 210
 211 static int
 212 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 213 {
 214         int rc;
 215         ses->server->CurrentMid = 0;
 216         rc = SMB2_negotiate(xid, ses);
 217         /* BB we probably don't need to retry with modern servers */
 218         if (rc == -EAGAIN)
 219                 rc = -EHOSTDOWN;
 220         return rc;
 221 }
 222
 223 static unsigned int
 224 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 225 {
 226         struct TCP_Server_Info *server = tcon->ses->server;
 227         unsigned int wsize;
 228
 229         /* start with specified wsize, or default */
 230         wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
 231         wsize = min_t(unsigned int, wsize, server->max_write);
 232
 233         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 234                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 235
 236         return wsize;
 237 }
 238
 239 static unsigned int
 240 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 241 {
 242         struct TCP_Server_Info *server = tcon->ses->server;
 243         unsigned int rsize;
 244
 245         /* start with specified rsize, or default */
 246         rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
 247         rsize = min_t(unsigned int, rsize, server->max_read);
 248         /* set it to the maximum buffer size value we can send with 1 credit */
 249         rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 250
 251         return rsize;
 252 }
 253
 254 #ifdef CONFIG_CIFS_STATS2
 255 static int
 256 SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
 257 {
 258         int rc;
 259         unsigned int ret_data_len = 0;
 260         struct network_interface_info_ioctl_rsp *out_buf;
 261
 262         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 263                         FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
 264                         NULL /* no data input */, 0 /* no data input */,
 265                         (char **)&out_buf, &ret_data_len);
 266
 267         if ((rc == 0)  && (ret_data_len > 0)) {
 268                 /* Dump info on first interface */
 269                 cifs_dbg(FYI, "Adapter Capability 0x%x\t",
 270                         le32_to_cpu(out_buf->Capability));
 271                 cifs_dbg(FYI, "Link Speed %lld\n",
 272                         le64_to_cpu(out_buf->LinkSpeed));
 273         } else
 274                 cifs_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
 275
 276         return rc;
 277 }
 278 #endif /* STATS2 */
 279
 280 static void
 281 smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 282 {
 283         int rc;
 284         __le16 srch_path = 0; /* Null - open root of share */
 285         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 286         struct cifs_open_parms oparms;
 287         struct cifs_fid fid;
 288
 289         oparms.tcon = tcon;
 290         oparms.desired_access = FILE_READ_ATTRIBUTES;
 291         oparms.disposition = FILE_OPEN;
 292         oparms.create_options = 0;
 293         oparms.fid = &fid;
 294         oparms.reconnect = false;
 295
 296         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
 297         if (rc)
 298                 return;
 299
 300 #ifdef CONFIG_CIFS_STATS2
 301         SMB3_request_interfaces(xid, tcon);
 302 #endif /* STATS2 */
 303
 304         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 305                         FS_ATTRIBUTE_INFORMATION);
 306         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 307                         FS_DEVICE_INFORMATION);
 308         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 309                         FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
 310         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 311         return;
 312 }
 313
 314 static void
 315 smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 316 {
 317         int rc;
 318         __le16 srch_path = 0; /* Null - open root of share */
 319         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 320         struct cifs_open_parms oparms;
 321         struct cifs_fid fid;
 322
 323         oparms.tcon = tcon;
 324         oparms.desired_access = FILE_READ_ATTRIBUTES;
 325         oparms.disposition = FILE_OPEN;
 326         oparms.create_options = 0;
 327         oparms.fid = &fid;
 328         oparms.reconnect = false;
 329
 330         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
 331         if (rc)
 332                 return;
 333
 334         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 335                         FS_ATTRIBUTE_INFORMATION);
 336         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 337                         FS_DEVICE_INFORMATION);
 338         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 339         return;
 340 }
 341
 342 static int
 343 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 344                         struct cifs_sb_info *cifs_sb, const char *full_path)
 345 {
 346         int rc;
 347         __le16 *utf16_path;
 348         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 349         struct cifs_open_parms oparms;
 350         struct cifs_fid fid;
 351
 352         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 353         if (!utf16_path)
 354                 return -ENOMEM;
 355
 356         oparms.tcon = tcon;
 357         oparms.desired_access = FILE_READ_ATTRIBUTES;
 358         oparms.disposition = FILE_OPEN;
 359         oparms.create_options = 0;
 360         oparms.fid = &fid;
 361         oparms.reconnect = false;
 362
 363         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 364         if (rc) {
 365                 kfree(utf16_path);
 366                 return rc;
 367         }
 368
 369         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 370         kfree(utf16_path);
 371         return rc;
 372 }
 373
 374 static int
 375 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 376                   struct cifs_sb_info *cifs_sb, const char *full_path,
 377                   u64 *uniqueid, FILE_ALL_INFO *data)
 378 {
 379         *uniqueid = le64_to_cpu(data->IndexNumber);
 380         return 0;
 381 }
 382
 383 static int
 384 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 385                      struct cifs_fid *fid, FILE_ALL_INFO *data)
 386 {
 387         int rc;
 388         struct smb2_file_all_info *smb2_data;
 389
 390         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
 391                             GFP_KERNEL);
 392         if (smb2_data == NULL)
 393                 return -ENOMEM;
 394
 395         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
 396                              smb2_data);
 397         if (!rc)
 398                 move_smb2_info_to_cifs(data, smb2_data);
 399         kfree(smb2_data);
 400         return rc;
 401 }
 402
 403 static bool
 404 smb2_can_echo(struct TCP_Server_Info *server)
 405 {
 406         return server->echoes;
 407 }
 408
 409 static void
 410 smb2_clear_stats(struct cifs_tcon *tcon)
 411 {
 412 #ifdef CONFIG_CIFS_STATS
 413         int i;
 414         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
 415                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
 416                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
 417         }
 418 #endif
 419 }
 420
 421 static void
 422 smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
 423 {
 424         seq_puts(m, "\n\tShare Capabilities:");
 425         if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
 426                 seq_puts(m, " DFS,");
 427         if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
 428                 seq_puts(m, " CONTINUOUS AVAILABILITY,");
 429         if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
 430                 seq_puts(m, " SCALEOUT,");
 431         if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
 432                 seq_puts(m, " CLUSTER,");
 433         if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
 434                 seq_puts(m, " ASYMMETRIC,");
 435         if (tcon->capabilities == 0)
 436                 seq_puts(m, " None");
 437         if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
 438                 seq_puts(m, " Aligned,");
 439         if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
 440                 seq_puts(m, " Partition Aligned,");
 441         if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
 442                 seq_puts(m, " SSD,");
 443         if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
 444                 seq_puts(m, " TRIM-support,");
 445
 446         seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
 447         if (tcon->perf_sector_size)
 448                 seq_printf(m, "\tOptimal sector size: 0x%x",
 449                            tcon->perf_sector_size);
 450 }
 451
 452 static void
 453 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
 454 {
 455 #ifdef CONFIG_CIFS_STATS
 456         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
 457         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
 458         seq_printf(m, "\nNegotiates: %d sent %d failed",
 459                    atomic_read(&sent[SMB2_NEGOTIATE_HE]),
 460                    atomic_read(&failed[SMB2_NEGOTIATE_HE]));
 461         seq_printf(m, "\nSessionSetups: %d sent %d failed",
 462                    atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
 463                    atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
 464         seq_printf(m, "\nLogoffs: %d sent %d failed",
 465                    atomic_read(&sent[SMB2_LOGOFF_HE]),
 466                    atomic_read(&failed[SMB2_LOGOFF_HE]));
 467         seq_printf(m, "\nTreeConnects: %d sent %d failed",
 468                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
 469                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
 470         seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
 471                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
 472                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
 473         seq_printf(m, "\nCreates: %d sent %d failed",
 474                    atomic_read(&sent[SMB2_CREATE_HE]),
 475                    atomic_read(&failed[SMB2_CREATE_HE]));
 476         seq_printf(m, "\nCloses: %d sent %d failed",
 477                    atomic_read(&sent[SMB2_CLOSE_HE]),
 478                    atomic_read(&failed[SMB2_CLOSE_HE]));
 479         seq_printf(m, "\nFlushes: %d sent %d failed",
 480                    atomic_read(&sent[SMB2_FLUSH_HE]),
 481                    atomic_read(&failed[SMB2_FLUSH_HE]));
 482         seq_printf(m, "\nReads: %d sent %d failed",
 483                    atomic_read(&sent[SMB2_READ_HE]),
 484                    atomic_read(&failed[SMB2_READ_HE]));
 485         seq_printf(m, "\nWrites: %d sent %d failed",
 486                    atomic_read(&sent[SMB2_WRITE_HE]),
 487                    atomic_read(&failed[SMB2_WRITE_HE]));
 488         seq_printf(m, "\nLocks: %d sent %d failed",
 489                    atomic_read(&sent[SMB2_LOCK_HE]),
 490                    atomic_read(&failed[SMB2_LOCK_HE]));
 491         seq_printf(m, "\nIOCTLs: %d sent %d failed",
 492                    atomic_read(&sent[SMB2_IOCTL_HE]),
 493                    atomic_read(&failed[SMB2_IOCTL_HE]));
 494         seq_printf(m, "\nCancels: %d sent %d failed",
 495                    atomic_read(&sent[SMB2_CANCEL_HE]),
 496                    atomic_read(&failed[SMB2_CANCEL_HE]));
 497         seq_printf(m, "\nEchos: %d sent %d failed",
 498                    atomic_read(&sent[SMB2_ECHO_HE]),
 499                    atomic_read(&failed[SMB2_ECHO_HE]));
 500         seq_printf(m, "\nQueryDirectories: %d sent %d failed",
 501                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
 502                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
 503         seq_printf(m, "\nChangeNotifies: %d sent %d failed",
 504                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
 505                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
 506         seq_printf(m, "\nQueryInfos: %d sent %d failed",
 507                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
 508                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
 509         seq_printf(m, "\nSetInfos: %d sent %d failed",
 510                    atomic_read(&sent[SMB2_SET_INFO_HE]),
 511                    atomic_read(&failed[SMB2_SET_INFO_HE]));
 512         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
 513                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
 514                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
 515 #endif
 516 }
 517
 518 static void
 519 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
 520 {
 521         struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
 522         struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
 523
 524         cfile->fid.persistent_fid = fid->persistent_fid;
 525         cfile->fid.volatile_fid = fid->volatile_fid;
 526         server->ops->set_oplock_level(cinode, oplock, fid->epoch,
 527                                       &fid->purge_cache);
 528         cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
 529 }
 530
 531 static void
 532 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
 533                 struct cifs_fid *fid)
 534 {
 535         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 536 }
 537
 538 static int
 539 SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
 540                      u64 persistent_fid, u64 volatile_fid,
 541                      struct copychunk_ioctl *pcchunk)
 542 {
 543         int rc;
 544         unsigned int ret_data_len;
 545         struct resume_key_req *res_key;
 546
 547         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
 548                         FSCTL_SRV_REQUEST_RESUME_KEY, true /* is_fsctl */,
 549                         NULL, 0 /* no input */,
 550                         (char **)&res_key, &ret_data_len);
 551
 552         if (rc) {
 553                 cifs_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
 554                 goto req_res_key_exit;
 555         }
 556         if (ret_data_len < sizeof(struct resume_key_req)) {
 557                 cifs_dbg(VFS, "Invalid refcopy resume key length\n");
 558                 rc = -EINVAL;
 559                 goto req_res_key_exit;
 560         }
 561         memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
 562
 563 req_res_key_exit:
 564         kfree(res_key);
 565         return rc;
 566 }
 567
 568 static int
 569 smb2_clone_range(const unsigned int xid,
 570                         struct cifsFileInfo *srcfile,
 571                         struct cifsFileInfo *trgtfile, u64 src_off,
 572                         u64 len, u64 dest_off)
 573 {
 574         int rc;
 575         unsigned int ret_data_len;
 576         struct copychunk_ioctl *pcchunk;
 577         struct copychunk_ioctl_rsp *retbuf = NULL;
 578         struct cifs_tcon *tcon;
 579         int chunks_copied = 0;
 580         bool chunk_sizes_updated = false;
 581
 582         pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
 583
 584         if (pcchunk == NULL)
 585                 return -ENOMEM;
 586
 587         cifs_dbg(FYI, "in smb2_clone_range - about to call request res key\n");
 588         /* Request a key from the server to identify the source of the copy */
 589         rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
 590                                 srcfile->fid.persistent_fid,
 591                                 srcfile->fid.volatile_fid, pcchunk);
 592
 593         /* Note: request_res_key sets res_key null only if rc !=0 */
 594         if (rc)
 595                 goto cchunk_out;
 596
 597         /* For now array only one chunk long, will make more flexible later */
 598         pcchunk->ChunkCount = __constant_cpu_to_le32(1);
 599         pcchunk->Reserved = 0;
 600         pcchunk->Reserved2 = 0;
 601
 602         tcon = tlink_tcon(trgtfile->tlink);
 603
 604         while (len > 0) {
 605                 pcchunk->SourceOffset = cpu_to_le64(src_off);
 606                 pcchunk->TargetOffset = cpu_to_le64(dest_off);
 607                 pcchunk->Length =
 608                         cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));
 609
 610                 /* Request server copy to target from src identified by key */
 611                 rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
 612                         trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
 613                         true /* is_fsctl */, (char *)pcchunk,
 614                         sizeof(struct copychunk_ioctl), (char **)&retbuf,
 615                         &ret_data_len);
 616                 if (rc == 0) {
 617                         if (ret_data_len !=
 618                                         sizeof(struct copychunk_ioctl_rsp)) {
 619                                 cifs_dbg(VFS, "invalid cchunk response size\n");
 620                                 rc = -EIO;
 621                                 goto cchunk_out;
 622                         }
 623                         if (retbuf->TotalBytesWritten == 0) {
 624                                 cifs_dbg(FYI, "no bytes copied\n");
 625                                 rc = -EIO;
 626                                 goto cchunk_out;
 627                         }
 628                         /*
 629                          * Check if server claimed to write more than we asked
 630                          */
 631                         if (le32_to_cpu(retbuf->TotalBytesWritten) >
 632                             le32_to_cpu(pcchunk->Length)) {
 633                                 cifs_dbg(VFS, "invalid copy chunk response\n");
 634                                 rc = -EIO;
 635                                 goto cchunk_out;
 636                         }
 637                         if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
 638                                 cifs_dbg(VFS, "invalid num chunks written\n");
 639                                 rc = -EIO;
 640                                 goto cchunk_out;
 641                         }
 642                         chunks_copied++;
 643
 644                         src_off += le32_to_cpu(retbuf->TotalBytesWritten);
 645                         dest_off += le32_to_cpu(retbuf->TotalBytesWritten);
 646                         len -= le32_to_cpu(retbuf->TotalBytesWritten);
 647
 648                         cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %d\n",
 649                                 le32_to_cpu(retbuf->ChunksWritten),
 650                                 le32_to_cpu(retbuf->ChunkBytesWritten),
 651                                 le32_to_cpu(retbuf->TotalBytesWritten));
 652                 } else if (rc == -EINVAL) {
 653                         if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
 654                                 goto cchunk_out;
 655
 656                         cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
 657                                 le32_to_cpu(retbuf->ChunksWritten),
 658                                 le32_to_cpu(retbuf->ChunkBytesWritten),
 659                                 le32_to_cpu(retbuf->TotalBytesWritten));
 660
 661                         /*
 662                          * Check if this is the first request using these sizes,
 663                          * (ie check if copy succeed once with original sizes
 664                          * and check if the server gave us different sizes after
 665                          * we already updated max sizes on previous request).
 666                          * if not then why is the server returning an error now
 667                          */
 668                         if ((chunks_copied != 0) || chunk_sizes_updated)
 669                                 goto cchunk_out;
 670
 671                         /* Check that server is not asking us to grow size */
 672                         if (le32_to_cpu(retbuf->ChunkBytesWritten) <
 673                                         tcon->max_bytes_chunk)
 674                                 tcon->max_bytes_chunk =
 675                                         le32_to_cpu(retbuf->ChunkBytesWritten);
 676                         else
 677                                 goto cchunk_out; /* server gave us bogus size */
 678
 679                         /* No need to change MaxChunks since already set to 1 */
 680                         chunk_sizes_updated = true;
 681                 }
 682         }
 683
 684 cchunk_out:
 685         kfree(pcchunk);
 686         return rc;
 687 }
 688
 689 static int
 690 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
 691                 struct cifs_fid *fid)
 692 {
 693         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 694 }
 695
 696 static unsigned int
 697 smb2_read_data_offset(char *buf)
 698 {
 699         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 700         return rsp->DataOffset;
 701 }
 702
 703 static unsigned int
 704 smb2_read_data_length(char *buf)
 705 {
 706         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 707         return le32_to_cpu(rsp->DataLength);
 708 }
 709
 710
 711 static int
 712 smb2_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
 713                struct cifs_io_parms *parms, unsigned int *bytes_read,
 714                char **buf, int *buf_type)
 715 {
 716         parms->persistent_fid = cfile->fid.persistent_fid;
 717         parms->volatile_fid = cfile->fid.volatile_fid;
 718         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
 719 }
 720
 721 static int
 722 smb2_sync_write(const unsigned int xid, struct cifsFileInfo *cfile,
 723                 struct cifs_io_parms *parms, unsigned int *written,
 724                 struct kvec *iov, unsigned long nr_segs)
 725 {
 726
 727         parms->persistent_fid = cfile->fid.persistent_fid;
 728         parms->volatile_fid = cfile->fid.volatile_fid;
 729         return SMB2_write(xid, parms, written, iov, nr_segs);
 730 }
 731
 732 static int
 733 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
 734                    struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
 735 {
 736         __le64 eof = cpu_to_le64(size);
 737         return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
 738                             cfile->fid.volatile_fid, cfile->pid, &eof);
 739 }
 740
 741 static int
 742 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
 743                    struct cifsFileInfo *cfile)
 744 {
 745         return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
 746                             cfile->fid.volatile_fid);
 747 }
 748
 749 static int
 750 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
 751                      const char *path, struct cifs_sb_info *cifs_sb,
 752                      struct cifs_fid *fid, __u16 search_flags,
 753                      struct cifs_search_info *srch_inf)
 754 {
 755         __le16 *utf16_path;
 756         int rc;
 757         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 758         struct cifs_open_parms oparms;
 759
 760         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 761         if (!utf16_path)
 762                 return -ENOMEM;
 763
 764         oparms.tcon = tcon;
 765         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
 766         oparms.disposition = FILE_OPEN;
 767         oparms.create_options = 0;
 768         oparms.fid = fid;
 769         oparms.reconnect = false;
 770
 771         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 772         kfree(utf16_path);
 773         if (rc) {
 774                 cifs_dbg(VFS, "open dir failed\n");
 775                 return rc;
 776         }
 777
 778         srch_inf->entries_in_buffer = 0;
 779         srch_inf->index_of_last_entry = 0;
 780
 781         rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
 782                                   fid->volatile_fid, 0, srch_inf);
 783         if (rc) {
 784                 cifs_dbg(VFS, "query directory failed\n");
 785                 SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 786         }
 787         return rc;
 788 }
 789
 790 static int
 791 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
 792                     struct cifs_fid *fid, __u16 search_flags,
 793                     struct cifs_search_info *srch_inf)
 794 {
 795         return SMB2_query_directory(xid, tcon, fid->persistent_fid,
 796                                     fid->volatile_fid, 0, srch_inf);
 797 }
 798
 799 static int
 800 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
 801                struct cifs_fid *fid)
 802 {
 803         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 804 }
 805
 806 /*
 807 * If we negotiate SMB2 protocol and get STATUS_PENDING - update
 808 * the number of credits and return true. Otherwise - return false.
 809 */
 810 static bool
 811 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server, int length)
 812 {
 813         struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
 814
 815         if (hdr->Status != STATUS_PENDING)
 816                 return false;
 817
 818         if (!length) {
 819                 spin_lock(&server->req_lock);
 820                 server->credits += le16_to_cpu(hdr->CreditRequest);
 821                 spin_unlock(&server->req_lock);
 822                 wake_up(&server->request_q);
 823         }
 824
 825         return true;
 826 }
 827
 828 static int
 829 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
 830                      struct cifsInodeInfo *cinode)
 831 {
 832         if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
 833                 return SMB2_lease_break(0, tcon, cinode->lease_key,
 834                                         smb2_get_lease_state(cinode));
 835
 836         return SMB2_oplock_break(0, tcon, fid->persistent_fid,
 837                                  fid->volatile_fid,
 838                                  CIFS_CACHE_READ(cinode) ? 1 : 0);
 839 }
 840
 841 static int
 842 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
 843              struct kstatfs *buf)
 844 {
 845         int rc;
 846         __le16 srch_path = 0; /* Null - open root of share */
 847         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 848         struct cifs_open_parms oparms;
 849         struct cifs_fid fid;
 850
 851         oparms.tcon = tcon;
 852         oparms.desired_access = FILE_READ_ATTRIBUTES;
 853         oparms.disposition = FILE_OPEN;
 854         oparms.create_options = 0;
 855         oparms.fid = &fid;
 856         oparms.reconnect = false;
 857
 858         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
 859         if (rc)
 860                 return rc;
 861         buf->f_type = SMB2_MAGIC_NUMBER;
 862         rc = SMB2_QFS_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 863                            buf);
 864         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 865         return rc;
 866 }
 867
 868 static bool
 869 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
 870 {
 871         return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
 872                ob1->fid.volatile_fid == ob2->fid.volatile_fid;
 873 }
 874
 875 static int
 876 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
 877                __u64 length, __u32 type, int lock, int unlock, bool wait)
 878 {
 879         if (unlock && !lock)
 880                 type = SMB2_LOCKFLAG_UNLOCK;
 881         return SMB2_lock(xid, tlink_tcon(cfile->tlink),
 882                          cfile->fid.persistent_fid, cfile->fid.volatile_fid,
 883                          current->tgid, length, offset, type, wait);
 884 }
 885
 886 static void
 887 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
 888 {
 889         memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
 890 }
 891
 892 static void
 893 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
 894 {
 895         memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
 896 }
 897
 898 static void
 899 smb2_new_lease_key(struct cifs_fid *fid)
 900 {
 901         get_random_bytes(fid->lease_key, SMB2_LEASE_KEY_SIZE);
 902 }
 903
 904 static int
 905 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
 906                    const char *full_path, char **target_path,
 907                    struct cifs_sb_info *cifs_sb)
 908 {
 909         int rc;
 910         __le16 *utf16_path;
 911         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 912         struct cifs_open_parms oparms;
 913         struct cifs_fid fid;
 914         struct smb2_err_rsp *err_buf = NULL;
 915         struct smb2_symlink_err_rsp *symlink;
 916         unsigned int sub_len, sub_offset;
 917
 918         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
 919
 920         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 921         if (!utf16_path)
 922                 return -ENOMEM;
 923
 924         oparms.tcon = tcon;
 925         oparms.desired_access = FILE_READ_ATTRIBUTES;
 926         oparms.disposition = FILE_OPEN;
 927         oparms.create_options = 0;
 928         oparms.fid = &fid;
 929         oparms.reconnect = false;
 930
 931         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_buf);
 932
 933         if (!rc || !err_buf) {
 934                 kfree(utf16_path);
 935                 return -ENOENT;
 936         }
 937         /* open must fail on symlink - reset rc */
 938         rc = 0;
 939         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
 940         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
 941         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
 942         *target_path = cifs_strndup_from_utf16(
 943                                 (char *)symlink->PathBuffer + sub_offset,
 944                                 sub_len, true, cifs_sb->local_nls);
 945         if (!(*target_path)) {
 946                 kfree(utf16_path);
 947                 return -ENOMEM;
 948         }
 949         convert_delimiter(*target_path, '/');
 950         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
 951         kfree(utf16_path);
 952         return rc;
 953 }
 954
 955 static void
 956 smb2_downgrade_oplock(struct TCP_Server_Info *server,
 957                         struct cifsInodeInfo *cinode, bool set_level2)
 958 {
 959         if (set_level2)
 960                 server->ops->set_oplock_level(cinode, SMB2_OPLOCK_LEVEL_II,
 961                                                 0, NULL);
 962         else
 963                 server->ops->set_oplock_level(cinode, 0, 0, NULL);
 964 }
 965
 966 static void
 967 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
 968                       unsigned int epoch, bool *purge_cache)
 969 {
 970         oplock &= 0xFF;
 971         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
 972                 return;
 973         if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
 974                 cinode->oplock = CIFS_CACHE_RHW_FLG;
 975                 cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
 976                          &cinode->vfs_inode);
 977         } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
 978                 cinode->oplock = CIFS_CACHE_RW_FLG;
 979                 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
 980                          &cinode->vfs_inode);
 981         } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
 982                 cinode->oplock = CIFS_CACHE_READ_FLG;
 983                 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
 984                          &cinode->vfs_inode);
 985         } else
 986                 cinode->oplock = 0;
 987 }
 988
 989 static void
 990 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
 991                        unsigned int epoch, bool *purge_cache)
 992 {
 993         char message[5] = {0};
 994
 995         oplock &= 0xFF;
 996         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
 997                 return;
 998
 999         cinode->oplock = 0;
1000         if (oplock & SMB2_LEASE_READ_CACHING_HE) {
1001                 cinode->oplock |= CIFS_CACHE_READ_FLG;
1002                 strcat(message, "R");
1003         }
1004         if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
1005                 cinode->oplock |= CIFS_CACHE_HANDLE_FLG;
1006                 strcat(message, "H");
1007         }
1008         if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
1009                 cinode->oplock |= CIFS_CACHE_WRITE_FLG;
1010                 strcat(message, "W");
1011         }
1012         if (!cinode->oplock)
1013                 strcat(message, "None");
1014         cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
1015                  &cinode->vfs_inode);
1016 }
1017
1018 static void
1019 smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
1020                       unsigned int epoch, bool *purge_cache)
1021 {
1022         unsigned int old_oplock = cinode->oplock;
1023
1024         smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
1025
1026         if (purge_cache) {
1027                 *purge_cache = false;
1028                 if (old_oplock == CIFS_CACHE_READ_FLG) {
1029                         if (cinode->oplock == CIFS_CACHE_READ_FLG &&
1030                             (epoch - cinode->epoch > 0))
1031                                 *purge_cache = true;
1032                         else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
1033                                  (epoch - cinode->epoch > 1))
1034                                 *purge_cache = true;
1035                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
1036                                  (epoch - cinode->epoch > 1))
1037                                 *purge_cache = true;
1038                         else if (cinode->oplock == 0 &&
1039                                  (epoch - cinode->epoch > 0))
1040                                 *purge_cache = true;
1041                 } else if (old_oplock == CIFS_CACHE_RH_FLG) {
1042                         if (cinode->oplock == CIFS_CACHE_RH_FLG &&
1043                             (epoch - cinode->epoch > 0))
1044                                 *purge_cache = true;
1045                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
1046                                  (epoch - cinode->epoch > 1))
1047                                 *purge_cache = true;
1048                 }
1049                 cinode->epoch = epoch;
1050         }
1051 }
1052
1053 static bool
1054 smb2_is_read_op(__u32 oplock)
1055 {
1056         return oplock == SMB2_OPLOCK_LEVEL_II;
1057 }
1058
1059 static bool
1060 smb21_is_read_op(__u32 oplock)
1061 {
1062         return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
1063                !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
1064 }
1065
1066 static __le32
1067 map_oplock_to_lease(u8 oplock)
1068 {
1069         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
1070                 return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
1071         else if (oplock == SMB2_OPLOCK_LEVEL_II)
1072                 return SMB2_LEASE_READ_CACHING;
1073         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
1074                 return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
1075                        SMB2_LEASE_WRITE_CACHING;
1076         return 0;
1077 }
1078
1079 static char *
1080 smb2_create_lease_buf(u8 *lease_key, u8 oplock)
1081 {
1082         struct create_lease *buf;
1083
1084         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
1085         if (!buf)
1086                 return NULL;
1087
1088         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
1089         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
1090         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
1091
1092         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1093                                         (struct create_lease, lcontext));
1094         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
1095         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1096                                 (struct create_lease, Name));
1097         buf->ccontext.NameLength = cpu_to_le16(4);
1098         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
1099         buf->Name[0] = 'R';
1100         buf->Name[1] = 'q';
1101         buf->Name[2] = 'L';
1102         buf->Name[3] = 's';
1103         return (char *)buf;
1104 }
1105
1106 static char *
1107 smb3_create_lease_buf(u8 *lease_key, u8 oplock)
1108 {
1109         struct create_lease_v2 *buf;
1110
1111         buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
1112         if (!buf)
1113                 return NULL;
1114
1115         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
1116         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
1117         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
1118
1119         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1120                                         (struct create_lease_v2, lcontext));
1121         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
1122         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1123                                 (struct create_lease_v2, Name));
1124         buf->ccontext.NameLength = cpu_to_le16(4);
1125         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
1126         buf->Name[0] = 'R';
1127         buf->Name[1] = 'q';
1128         buf->Name[2] = 'L';
1129         buf->Name[3] = 's';
1130         return (char *)buf;
1131 }
1132
1133 static __u8
1134 smb2_parse_lease_buf(void *buf, unsigned int *epoch)
1135 {
1136         struct create_lease *lc = (struct create_lease *)buf;
1137
1138         *epoch = 0; /* not used */
1139         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
1140                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
1141         return le32_to_cpu(lc->lcontext.LeaseState);
1142 }
1143
1144 static __u8
1145 smb3_parse_lease_buf(void *buf, unsigned int *epoch)
1146 {
1147         struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
1148
1149         *epoch = le16_to_cpu(lc->lcontext.Epoch);
1150         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
1151                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
1152         return le32_to_cpu(lc->lcontext.LeaseState);
1153 }
1154
1155 static unsigned int
1156 smb2_wp_retry_size(struct inode *inode)
1157 {
1158         return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
1159                      SMB2_MAX_BUFFER_SIZE);
1160 }
1161
1162 struct smb_version_operations smb20_operations = {
1163         .compare_fids = smb2_compare_fids,
1164         .setup_request = smb2_setup_request,
1165         .setup_async_request = smb2_setup_async_request,
1166         .check_receive = smb2_check_receive,
1167         .add_credits = smb2_add_credits,
1168         .set_credits = smb2_set_credits,
1169         .get_credits_field = smb2_get_credits_field,
1170         .get_credits = smb2_get_credits,
1171         .wait_mtu_credits = cifs_wait_mtu_credits,
1172         .get_next_mid = smb2_get_next_mid,
1173         .read_data_offset = smb2_read_data_offset,
1174         .read_data_length = smb2_read_data_length,
1175         .map_error = map_smb2_to_linux_error,
1176         .find_mid = smb2_find_mid,
1177         .check_message = smb2_check_message,
1178         .dump_detail = smb2_dump_detail,
1179         .clear_stats = smb2_clear_stats,
1180         .print_stats = smb2_print_stats,
1181         .is_oplock_break = smb2_is_valid_oplock_break,
1182         .downgrade_oplock = smb2_downgrade_oplock,
1183         .need_neg = smb2_need_neg,
1184         .negotiate = smb2_negotiate,
1185         .negotiate_wsize = smb2_negotiate_wsize,
1186         .negotiate_rsize = smb2_negotiate_rsize,
1187         .sess_setup = SMB2_sess_setup,
1188         .logoff = SMB2_logoff,
1189         .tree_connect = SMB2_tcon,
1190         .tree_disconnect = SMB2_tdis,
1191         .qfs_tcon = smb2_qfs_tcon,
1192         .is_path_accessible = smb2_is_path_accessible,
1193         .can_echo = smb2_can_echo,
1194         .echo = SMB2_echo,
1195         .query_path_info = smb2_query_path_info,
1196         .get_srv_inum = smb2_get_srv_inum,
1197         .query_file_info = smb2_query_file_info,
1198         .set_path_size = smb2_set_path_size,
1199         .set_file_size = smb2_set_file_size,
1200         .set_file_info = smb2_set_file_info,
1201         .set_compression = smb2_set_compression,
1202         .mkdir = smb2_mkdir,
1203         .mkdir_setinfo = smb2_mkdir_setinfo,
1204         .rmdir = smb2_rmdir,
1205         .unlink = smb2_unlink,
1206         .rename = smb2_rename_path,
1207         .create_hardlink = smb2_create_hardlink,
1208         .query_symlink = smb2_query_symlink,
1209         .open = smb2_open_file,
1210         .set_fid = smb2_set_fid,
1211         .close = smb2_close_file,
1212         .flush = smb2_flush_file,
1213         .async_readv = smb2_async_readv,
1214         .async_writev = smb2_async_writev,
1215         .sync_read = smb2_sync_read,
1216         .sync_write = smb2_sync_write,
1217         .query_dir_first = smb2_query_dir_first,
1218         .query_dir_next = smb2_query_dir_next,
1219         .close_dir = smb2_close_dir,
1220         .calc_smb_size = smb2_calc_size,
1221         .is_status_pending = smb2_is_status_pending,
1222         .oplock_response = smb2_oplock_response,
1223         .queryfs = smb2_queryfs,
1224         .mand_lock = smb2_mand_lock,
1225         .mand_unlock_range = smb2_unlock_range,
1226         .push_mand_locks = smb2_push_mandatory_locks,
1227         .get_lease_key = smb2_get_lease_key,
1228         .set_lease_key = smb2_set_lease_key,
1229         .new_lease_key = smb2_new_lease_key,
1230         .calc_signature = smb2_calc_signature,
1231         .is_read_op = smb2_is_read_op,
1232         .set_oplock_level = smb2_set_oplock_level,
1233         .create_lease_buf = smb2_create_lease_buf,
1234         .parse_lease_buf = smb2_parse_lease_buf,
1235         .clone_range = smb2_clone_range,
1236         .wp_retry_size = smb2_wp_retry_size,
1237 };
1238
1239 struct smb_version_operations smb21_operations = {
1240         .compare_fids = smb2_compare_fids,
1241         .setup_request = smb2_setup_request,
1242         .setup_async_request = smb2_setup_async_request,
1243         .check_receive = smb2_check_receive,
1244         .add_credits = smb2_add_credits,
1245         .set_credits = smb2_set_credits,
1246         .get_credits_field = smb2_get_credits_field,
1247         .get_credits = smb2_get_credits,
1248         .wait_mtu_credits = smb2_wait_mtu_credits,
1249         .get_next_mid = smb2_get_next_mid,
1250         .read_data_offset = smb2_read_data_offset,
1251         .read_data_length = smb2_read_data_length,
1252         .map_error = map_smb2_to_linux_error,
1253         .find_mid = smb2_find_mid,
1254         .check_message = smb2_check_message,
1255         .dump_detail = smb2_dump_detail,
1256         .clear_stats = smb2_clear_stats,
1257         .print_stats = smb2_print_stats,
1258         .is_oplock_break = smb2_is_valid_oplock_break,
1259         .downgrade_oplock = smb2_downgrade_oplock,
1260         .need_neg = smb2_need_neg,
1261         .negotiate = smb2_negotiate,
1262         .negotiate_wsize = smb2_negotiate_wsize,
1263         .negotiate_rsize = smb2_negotiate_rsize,
1264         .sess_setup = SMB2_sess_setup,
1265         .logoff = SMB2_logoff,
1266         .tree_connect = SMB2_tcon,
1267         .tree_disconnect = SMB2_tdis,
1268         .qfs_tcon = smb2_qfs_tcon,
1269         .is_path_accessible = smb2_is_path_accessible,
1270         .can_echo = smb2_can_echo,
1271         .echo = SMB2_echo,
1272         .query_path_info = smb2_query_path_info,
1273         .get_srv_inum = smb2_get_srv_inum,
1274         .query_file_info = smb2_query_file_info,
1275         .set_path_size = smb2_set_path_size,
1276         .set_file_size = smb2_set_file_size,
1277         .set_file_info = smb2_set_file_info,
1278         .set_compression = smb2_set_compression,
1279         .mkdir = smb2_mkdir,
1280         .mkdir_setinfo = smb2_mkdir_setinfo,
1281         .rmdir = smb2_rmdir,
1282         .unlink = smb2_unlink,
1283         .rename = smb2_rename_path,
1284         .create_hardlink = smb2_create_hardlink,
1285         .query_symlink = smb2_query_symlink,
1286         .open = smb2_open_file,
1287         .set_fid = smb2_set_fid,
1288         .close = smb2_close_file,
1289         .flush = smb2_flush_file,
1290         .async_readv = smb2_async_readv,
1291         .async_writev = smb2_async_writev,
1292         .sync_read = smb2_sync_read,
1293         .sync_write = smb2_sync_write,
1294         .query_dir_first = smb2_query_dir_first,
1295         .query_dir_next = smb2_query_dir_next,
1296         .close_dir = smb2_close_dir,
1297         .calc_smb_size = smb2_calc_size,
1298         .is_status_pending = smb2_is_status_pending,
1299         .oplock_response = smb2_oplock_response,
1300         .queryfs = smb2_queryfs,
1301         .mand_lock = smb2_mand_lock,
1302         .mand_unlock_range = smb2_unlock_range,
1303         .push_mand_locks = smb2_push_mandatory_locks,
1304         .get_lease_key = smb2_get_lease_key,
1305         .set_lease_key = smb2_set_lease_key,
1306         .new_lease_key = smb2_new_lease_key,
1307         .calc_signature = smb2_calc_signature,
1308         .is_read_op = smb21_is_read_op,
1309         .set_oplock_level = smb21_set_oplock_level,
1310         .create_lease_buf = smb2_create_lease_buf,
1311         .parse_lease_buf = smb2_parse_lease_buf,
1312         .clone_range = smb2_clone_range,
1313         .wp_retry_size = smb2_wp_retry_size,
1314 };
1315
1316 struct smb_version_operations smb30_operations = {
1317         .compare_fids = smb2_compare_fids,
1318         .setup_request = smb2_setup_request,
1319         .setup_async_request = smb2_setup_async_request,
1320         .check_receive = smb2_check_receive,
1321         .add_credits = smb2_add_credits,
1322         .set_credits = smb2_set_credits,
1323         .get_credits_field = smb2_get_credits_field,
1324         .get_credits = smb2_get_credits,
1325         .wait_mtu_credits = smb2_wait_mtu_credits,
1326         .get_next_mid = smb2_get_next_mid,
1327         .read_data_offset = smb2_read_data_offset,
1328         .read_data_length = smb2_read_data_length,
1329         .map_error = map_smb2_to_linux_error,
1330         .find_mid = smb2_find_mid,
1331         .check_message = smb2_check_message,
1332         .dump_detail = smb2_dump_detail,
1333         .clear_stats = smb2_clear_stats,
1334         .print_stats = smb2_print_stats,
1335         .dump_share_caps = smb2_dump_share_caps,
1336         .is_oplock_break = smb2_is_valid_oplock_break,
1337         .downgrade_oplock = smb2_downgrade_oplock,
1338         .need_neg = smb2_need_neg,
1339         .negotiate = smb2_negotiate,
1340         .negotiate_wsize = smb2_negotiate_wsize,
1341         .negotiate_rsize = smb2_negotiate_rsize,
1342         .sess_setup = SMB2_sess_setup,
1343         .logoff = SMB2_logoff,
1344         .tree_connect = SMB2_tcon,
1345         .tree_disconnect = SMB2_tdis,
1346         .qfs_tcon = smb3_qfs_tcon,
1347         .is_path_accessible = smb2_is_path_accessible,
1348         .can_echo = smb2_can_echo,
1349         .echo = SMB2_echo,
1350         .query_path_info = smb2_query_path_info,
1351         .get_srv_inum = smb2_get_srv_inum,
1352         .query_file_info = smb2_query_file_info,
1353         .set_path_size = smb2_set_path_size,
1354         .set_file_size = smb2_set_file_size,
1355         .set_file_info = smb2_set_file_info,
1356         .set_compression = smb2_set_compression,
1357         .mkdir = smb2_mkdir,
1358         .mkdir_setinfo = smb2_mkdir_setinfo,
1359         .rmdir = smb2_rmdir,
1360         .unlink = smb2_unlink,
1361         .rename = smb2_rename_path,
1362         .create_hardlink = smb2_create_hardlink,
1363         .query_symlink = smb2_query_symlink,
1364         .open = smb2_open_file,
1365         .set_fid = smb2_set_fid,
1366         .close = smb2_close_file,
1367         .flush = smb2_flush_file,
1368         .async_readv = smb2_async_readv,
1369         .async_writev = smb2_async_writev,
1370         .sync_read = smb2_sync_read,
1371         .sync_write = smb2_sync_write,
1372         .query_dir_first = smb2_query_dir_first,
1373         .query_dir_next = smb2_query_dir_next,
1374         .close_dir = smb2_close_dir,
1375         .calc_smb_size = smb2_calc_size,
1376         .is_status_pending = smb2_is_status_pending,
1377         .oplock_response = smb2_oplock_response,
1378         .queryfs = smb2_queryfs,
1379         .mand_lock = smb2_mand_lock,
1380         .mand_unlock_range = smb2_unlock_range,
1381         .push_mand_locks = smb2_push_mandatory_locks,
1382         .get_lease_key = smb2_get_lease_key,
1383         .set_lease_key = smb2_set_lease_key,
1384         .new_lease_key = smb2_new_lease_key,
1385         .generate_signingkey = generate_smb3signingkey,
1386         .calc_signature = smb3_calc_signature,
1387         .is_read_op = smb21_is_read_op,
1388         .set_oplock_level = smb3_set_oplock_level,
1389         .create_lease_buf = smb3_create_lease_buf,
1390         .parse_lease_buf = smb3_parse_lease_buf,
1391         .clone_range = smb2_clone_range,
1392         .validate_negotiate = smb3_validate_negotiate,
1393         .wp_retry_size = smb2_wp_retry_size,
1394 };
1395
1396 struct smb_version_values smb20_values = {
1397         .version_string = SMB20_VERSION_STRING,
1398         .protocol_id = SMB20_PROT_ID,
1399         .req_capabilities = 0, /* MBZ */
1400         .large_lock_type = 0,
1401         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
1402         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
1403         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
1404         .header_size = sizeof(struct smb2_hdr),
1405         .max_header_size = MAX_SMB2_HDR_SIZE,
1406         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
1407         .lock_cmd = SMB2_LOCK,
1408         .cap_unix = 0,
1409         .cap_nt_find = SMB2_NT_FIND,
1410         .cap_large_files = SMB2_LARGE_FILES,
1411         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
1412         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
1413         .create_lease_size = sizeof(struct create_lease),
1414 };
1415
1416 struct smb_version_values smb21_values = {
1417         .version_string = SMB21_VERSION_STRING,
1418         .protocol_id = SMB21_PROT_ID,
1419         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
1420         .large_lock_type = 0,
1421         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
1422         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
1423         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
1424         .header_size = sizeof(struct smb2_hdr),
1425         .max_header_size = MAX_SMB2_HDR_SIZE,
1426         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
1427         .lock_cmd = SMB2_LOCK,
1428         .cap_unix = 0,
1429         .cap_nt_find = SMB2_NT_FIND,
1430         .cap_large_files = SMB2_LARGE_FILES,
1431         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
1432         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
1433         .create_lease_size = sizeof(struct create_lease),
1434 };
1435
1436 struct smb_version_values smb30_values = {
1437         .version_string = SMB30_VERSION_STRING,
1438         .protocol_id = SMB30_PROT_ID,
1439         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
1440         .large_lock_type = 0,
1441         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
1442         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
1443         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
1444         .header_size = sizeof(struct smb2_hdr),
1445         .max_header_size = MAX_SMB2_HDR_SIZE,
1446         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
1447         .lock_cmd = SMB2_LOCK,
1448         .cap_unix = 0,
1449         .cap_nt_find = SMB2_NT_FIND,
1450         .cap_large_files = SMB2_LARGE_FILES,
1451         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
1452         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
1453         .create_lease_size = sizeof(struct create_lease_v2),
1454 };
1455
1456 struct smb_version_values smb302_values = {
1457         .version_string = SMB302_VERSION_STRING,
1458         .protocol_id = SMB302_PROT_ID,
1459         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
1460         .large_lock_type = 0,
1461         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
1462         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
1463         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
1464         .header_size = sizeof(struct smb2_hdr),
1465         .max_header_size = MAX_SMB2_HDR_SIZE,
1466         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
1467         .lock_cmd = SMB2_LOCK,
1468         .cap_unix = 0,
1469         .cap_nt_find = SMB2_NT_FIND,
1470         .cap_large_files = SMB2_LARGE_FILES,
1471         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
1472         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
1473         .create_lease_size = sizeof(struct create_lease_v2),
1474 };