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 __u64
 116 smb2_get_next_mid(struct TCP_Server_Info *server)
 117 {
 118         __u64 mid;
 119         /* for SMB2 we need the current value */
 120         spin_lock(&GlobalMid_Lock);
 121         mid = server->CurrentMid++;
 122         spin_unlock(&GlobalMid_Lock);
 123         return mid;
 124 }
 125
 126 static struct mid_q_entry *
 127 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
 128 {
 129         struct mid_q_entry *mid;
 130         struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
 131
 132         spin_lock(&GlobalMid_Lock);
 133         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 134                 if ((mid->mid == hdr->MessageId) &&
 135                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
 136                     (mid->command == hdr->Command)) {
 137                         spin_unlock(&GlobalMid_Lock);
 138                         return mid;
 139                 }
 140         }
 141         spin_unlock(&GlobalMid_Lock);
 142         return NULL;
 143 }
 144
 145 static void
 146 smb2_dump_detail(void *buf)
 147 {
 148 #ifdef CONFIG_CIFS_DEBUG2
 149         struct smb2_hdr *smb = (struct smb2_hdr *)buf;
 150
 151         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
 152                  smb->Command, smb->Status, smb->Flags, smb->MessageId,
 153                  smb->ProcessId);
 154         cifs_dbg(VFS, "smb buf %p len %u\n", smb, smb2_calc_size(smb));
 155 #endif
 156 }
 157
 158 static bool
 159 smb2_need_neg(struct TCP_Server_Info *server)
 160 {
 161         return server->max_read == 0;
 162 }
 163
 164 static int
 165 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 166 {
 167         int rc;
 168         ses->server->CurrentMid = 0;
 169         rc = SMB2_negotiate(xid, ses);
 170         /* BB we probably don't need to retry with modern servers */
 171         if (rc == -EAGAIN)
 172                 rc = -EHOSTDOWN;
 173         return rc;
 174 }
 175
 176 static unsigned int
 177 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 178 {
 179         struct TCP_Server_Info *server = tcon->ses->server;
 180         unsigned int wsize;
 181
 182         /* start with specified wsize, or default */
 183         wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
 184         wsize = min_t(unsigned int, wsize, server->max_write);
 185         /*
 186          * limit write size to 2 ** 16, because we don't support multicredit
 187          * requests now.
 188          */
 189         wsize = min_t(unsigned int, wsize, 2 << 15);
 190
 191         return wsize;
 192 }
 193
 194 static unsigned int
 195 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 196 {
 197         struct TCP_Server_Info *server = tcon->ses->server;
 198         unsigned int rsize;
 199
 200         /* start with specified rsize, or default */
 201         rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
 202         rsize = min_t(unsigned int, rsize, server->max_read);
 203         /*
 204          * limit write size to 2 ** 16, because we don't support multicredit
 205          * requests now.
 206          */
 207         rsize = min_t(unsigned int, rsize, 2 << 15);
 208
 209         return rsize;
 210 }
 211
 212 static int
 213 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 214                         struct cifs_sb_info *cifs_sb, const char *full_path)
 215 {
 216         int rc;
 217         __le16 *utf16_path;
 218         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 219         struct cifs_open_parms oparms;
 220         struct cifs_fid fid;
 221
 222         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 223         if (!utf16_path)
 224                 return -ENOMEM;
 225
 226         oparms.tcon = tcon;
 227         oparms.desired_access = FILE_READ_ATTRIBUTES;
 228         oparms.disposition = FILE_OPEN;
 229         oparms.create_options = 0;
 230         oparms.fid = &fid;
 231         oparms.reconnect = false;
 232
 233         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 234         if (rc) {
 235                 kfree(utf16_path);
 236                 return rc;
 237         }
 238
 239         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 240         kfree(utf16_path);
 241         return rc;
 242 }
 243
 244 static int
 245 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 246                   struct cifs_sb_info *cifs_sb, const char *full_path,
 247                   u64 *uniqueid, FILE_ALL_INFO *data)
 248 {
 249         *uniqueid = le64_to_cpu(data->IndexNumber);
 250         return 0;
 251 }
 252
 253 static int
 254 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 255                      struct cifs_fid *fid, FILE_ALL_INFO *data)
 256 {
 257         int rc;
 258         struct smb2_file_all_info *smb2_data;
 259
 260         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
 261                             GFP_KERNEL);
 262         if (smb2_data == NULL)
 263                 return -ENOMEM;
 264
 265         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
 266                              smb2_data);
 267         if (!rc)
 268                 move_smb2_info_to_cifs(data, smb2_data);
 269         kfree(smb2_data);
 270         return rc;
 271 }
 272
 273 static bool
 274 smb2_can_echo(struct TCP_Server_Info *server)
 275 {
 276         return server->echoes;
 277 }
 278
 279 static void
 280 smb2_clear_stats(struct cifs_tcon *tcon)
 281 {
 282 #ifdef CONFIG_CIFS_STATS
 283         int i;
 284         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
 285                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
 286                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
 287         }
 288 #endif
 289 }
 290
 291 static void
 292 smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
 293 {
 294         seq_puts(m, "\n\tShare Capabilities:");
 295         if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
 296                 seq_puts(m, " DFS,");
 297         if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
 298                 seq_puts(m, " CONTINUOUS AVAILABILITY,");
 299         if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
 300                 seq_puts(m, " SCALEOUT,");
 301         if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
 302                 seq_puts(m, " CLUSTER,");
 303         if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
 304                 seq_puts(m, " ASYMMETRIC,");
 305         if (tcon->capabilities == 0)
 306                 seq_puts(m, " None");
 307         seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
 308 }
 309
 310 static void
 311 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
 312 {
 313 #ifdef CONFIG_CIFS_STATS
 314         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
 315         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
 316         seq_printf(m, "\nNegotiates: %d sent %d failed",
 317                    atomic_read(&sent[SMB2_NEGOTIATE_HE]),
 318                    atomic_read(&failed[SMB2_NEGOTIATE_HE]));
 319         seq_printf(m, "\nSessionSetups: %d sent %d failed",
 320                    atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
 321                    atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
 322         seq_printf(m, "\nLogoffs: %d sent %d failed",
 323                    atomic_read(&sent[SMB2_LOGOFF_HE]),
 324                    atomic_read(&failed[SMB2_LOGOFF_HE]));
 325         seq_printf(m, "\nTreeConnects: %d sent %d failed",
 326                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
 327                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
 328         seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
 329                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
 330                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
 331         seq_printf(m, "\nCreates: %d sent %d failed",
 332                    atomic_read(&sent[SMB2_CREATE_HE]),
 333                    atomic_read(&failed[SMB2_CREATE_HE]));
 334         seq_printf(m, "\nCloses: %d sent %d failed",
 335                    atomic_read(&sent[SMB2_CLOSE_HE]),
 336                    atomic_read(&failed[SMB2_CLOSE_HE]));
 337         seq_printf(m, "\nFlushes: %d sent %d failed",
 338                    atomic_read(&sent[SMB2_FLUSH_HE]),
 339                    atomic_read(&failed[SMB2_FLUSH_HE]));
 340         seq_printf(m, "\nReads: %d sent %d failed",
 341                    atomic_read(&sent[SMB2_READ_HE]),
 342                    atomic_read(&failed[SMB2_READ_HE]));
 343         seq_printf(m, "\nWrites: %d sent %d failed",
 344                    atomic_read(&sent[SMB2_WRITE_HE]),
 345                    atomic_read(&failed[SMB2_WRITE_HE]));
 346         seq_printf(m, "\nLocks: %d sent %d failed",
 347                    atomic_read(&sent[SMB2_LOCK_HE]),
 348                    atomic_read(&failed[SMB2_LOCK_HE]));
 349         seq_printf(m, "\nIOCTLs: %d sent %d failed",
 350                    atomic_read(&sent[SMB2_IOCTL_HE]),
 351                    atomic_read(&failed[SMB2_IOCTL_HE]));
 352         seq_printf(m, "\nCancels: %d sent %d failed",
 353                    atomic_read(&sent[SMB2_CANCEL_HE]),
 354                    atomic_read(&failed[SMB2_CANCEL_HE]));
 355         seq_printf(m, "\nEchos: %d sent %d failed",
 356                    atomic_read(&sent[SMB2_ECHO_HE]),
 357                    atomic_read(&failed[SMB2_ECHO_HE]));
 358         seq_printf(m, "\nQueryDirectories: %d sent %d failed",
 359                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
 360                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
 361         seq_printf(m, "\nChangeNotifies: %d sent %d failed",
 362                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
 363                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
 364         seq_printf(m, "\nQueryInfos: %d sent %d failed",
 365                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
 366                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
 367         seq_printf(m, "\nSetInfos: %d sent %d failed",
 368                    atomic_read(&sent[SMB2_SET_INFO_HE]),
 369                    atomic_read(&failed[SMB2_SET_INFO_HE]));
 370         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
 371                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
 372                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
 373 #endif
 374 }
 375
 376 static void
 377 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
 378 {
 379         struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
 380         cfile->fid.persistent_fid = fid->persistent_fid;
 381         cfile->fid.volatile_fid = fid->volatile_fid;
 382         smb2_set_oplock_level(cinode, oplock);
 383         cinode->can_cache_brlcks = cinode->clientCanCacheAll;
 384 }
 385
 386 static void
 387 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
 388                 struct cifs_fid *fid)
 389 {
 390         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 391 }
 392
 393 static int
 394 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
 395                 struct cifs_fid *fid)
 396 {
 397         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 398 }
 399
 400 static unsigned int
 401 smb2_read_data_offset(char *buf)
 402 {
 403         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 404         return rsp->DataOffset;
 405 }
 406
 407 static unsigned int
 408 smb2_read_data_length(char *buf)
 409 {
 410         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 411         return le32_to_cpu(rsp->DataLength);
 412 }
 413
 414
 415 static int
 416 smb2_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
 417                struct cifs_io_parms *parms, unsigned int *bytes_read,
 418                char **buf, int *buf_type)
 419 {
 420         parms->persistent_fid = cfile->fid.persistent_fid;
 421         parms->volatile_fid = cfile->fid.volatile_fid;
 422         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
 423 }
 424
 425 static int
 426 smb2_sync_write(const unsigned int xid, struct cifsFileInfo *cfile,
 427                 struct cifs_io_parms *parms, unsigned int *written,
 428                 struct kvec *iov, unsigned long nr_segs)
 429 {
 430
 431         parms->persistent_fid = cfile->fid.persistent_fid;
 432         parms->volatile_fid = cfile->fid.volatile_fid;
 433         return SMB2_write(xid, parms, written, iov, nr_segs);
 434 }
 435
 436 static int
 437 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
 438                    struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
 439 {
 440         __le64 eof = cpu_to_le64(size);
 441         return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
 442                             cfile->fid.volatile_fid, cfile->pid, &eof);
 443 }
 444
 445 static int
 446 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
 447                      const char *path, struct cifs_sb_info *cifs_sb,
 448                      struct cifs_fid *fid, __u16 search_flags,
 449                      struct cifs_search_info *srch_inf)
 450 {
 451         __le16 *utf16_path;
 452         int rc;
 453         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 454         struct cifs_open_parms oparms;
 455
 456         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 457         if (!utf16_path)
 458                 return -ENOMEM;
 459
 460         oparms.tcon = tcon;
 461         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
 462         oparms.disposition = FILE_OPEN;
 463         oparms.create_options = 0;
 464         oparms.fid = fid;
 465         oparms.reconnect = false;
 466
 467         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 468         kfree(utf16_path);
 469         if (rc) {
 470                 cifs_dbg(VFS, "open dir failed\n");
 471                 return rc;
 472         }
 473
 474         srch_inf->entries_in_buffer = 0;
 475         srch_inf->index_of_last_entry = 0;
 476
 477         rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
 478                                   fid->volatile_fid, 0, srch_inf);
 479         if (rc) {
 480                 cifs_dbg(VFS, "query directory failed\n");
 481                 SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 482         }
 483         return rc;
 484 }
 485
 486 static int
 487 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
 488                     struct cifs_fid *fid, __u16 search_flags,
 489                     struct cifs_search_info *srch_inf)
 490 {
 491         return SMB2_query_directory(xid, tcon, fid->persistent_fid,
 492                                     fid->volatile_fid, 0, srch_inf);
 493 }
 494
 495 static int
 496 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
 497                struct cifs_fid *fid)
 498 {
 499         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 500 }
 501
 502 /*
 503 * If we negotiate SMB2 protocol and get STATUS_PENDING - update
 504 * the number of credits and return true. Otherwise - return false.
 505 */
 506 static bool
 507 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server, int length)
 508 {
 509         struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
 510
 511         if (hdr->Status != STATUS_PENDING)
 512                 return false;
 513
 514         if (!length) {
 515                 spin_lock(&server->req_lock);
 516                 server->credits += le16_to_cpu(hdr->CreditRequest);
 517                 spin_unlock(&server->req_lock);
 518                 wake_up(&server->request_q);
 519         }
 520
 521         return true;
 522 }
 523
 524 static int
 525 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
 526                      struct cifsInodeInfo *cinode)
 527 {
 528         if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
 529                 return SMB2_lease_break(0, tcon, cinode->lease_key,
 530                                         smb2_get_lease_state(cinode));
 531
 532         return SMB2_oplock_break(0, tcon, fid->persistent_fid,
 533                                  fid->volatile_fid,
 534                                  cinode->clientCanCacheRead ? 1 : 0);
 535 }
 536
 537 static int
 538 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
 539              struct kstatfs *buf)
 540 {
 541         int rc;
 542         __le16 srch_path = 0; /* Null - open root of share */
 543         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 544         struct cifs_open_parms oparms;
 545         struct cifs_fid fid;
 546
 547         oparms.tcon = tcon;
 548         oparms.desired_access = FILE_READ_ATTRIBUTES;
 549         oparms.disposition = FILE_OPEN;
 550         oparms.create_options = 0;
 551         oparms.fid = &fid;
 552         oparms.reconnect = false;
 553
 554         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
 555         if (rc)
 556                 return rc;
 557         buf->f_type = SMB2_MAGIC_NUMBER;
 558         rc = SMB2_QFS_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 559                            buf);
 560         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 561         return rc;
 562 }
 563
 564 static bool
 565 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
 566 {
 567         return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
 568                ob1->fid.volatile_fid == ob2->fid.volatile_fid;
 569 }
 570
 571 static int
 572 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
 573                __u64 length, __u32 type, int lock, int unlock, bool wait)
 574 {
 575         if (unlock && !lock)
 576                 type = SMB2_LOCKFLAG_UNLOCK;
 577         return SMB2_lock(xid, tlink_tcon(cfile->tlink),
 578                          cfile->fid.persistent_fid, cfile->fid.volatile_fid,
 579                          current->tgid, length, offset, type, wait);
 580 }
 581
 582 static void
 583 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
 584 {
 585         memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
 586 }
 587
 588 static void
 589 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
 590 {
 591         memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
 592 }
 593
 594 static void
 595 smb2_new_lease_key(struct cifs_fid *fid)
 596 {
 597         get_random_bytes(fid->lease_key, SMB2_LEASE_KEY_SIZE);
 598 }
 599
 600 static int
 601 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
 602                    const char *full_path, char **target_path,
 603                    struct cifs_sb_info *cifs_sb)
 604 {
 605         int rc;
 606         __le16 *utf16_path;
 607         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 608         struct cifs_open_parms oparms;
 609         struct cifs_fid fid;
 610         struct smb2_err_rsp *err_buf = NULL;
 611         struct smb2_symlink_err_rsp *symlink;
 612         unsigned int sub_len, sub_offset;
 613
 614         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
 615
 616         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 617         if (!utf16_path)
 618                 return -ENOMEM;
 619
 620         oparms.tcon = tcon;
 621         oparms.desired_access = FILE_READ_ATTRIBUTES;
 622         oparms.disposition = FILE_OPEN;
 623         oparms.create_options = 0;
 624         oparms.fid = &fid;
 625         oparms.reconnect = false;
 626
 627         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_buf);
 628
 629         if (!rc || !err_buf) {
 630                 kfree(utf16_path);
 631                 return -ENOENT;
 632         }
 633         /* open must fail on symlink - reset rc */
 634         rc = 0;
 635         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
 636         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
 637         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
 638         *target_path = cifs_strndup_from_utf16(
 639                                 (char *)symlink->PathBuffer + sub_offset,
 640                                 sub_len, true, cifs_sb->local_nls);
 641         if (!(*target_path)) {
 642                 kfree(utf16_path);
 643                 return -ENOMEM;
 644         }
 645         convert_delimiter(*target_path, '/');
 646         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
 647         kfree(utf16_path);
 648         return rc;
 649 }
 650
 651 struct smb_version_operations smb21_operations = {
 652         .compare_fids = smb2_compare_fids,
 653         .setup_request = smb2_setup_request,
 654         .setup_async_request = smb2_setup_async_request,
 655         .check_receive = smb2_check_receive,
 656         .add_credits = smb2_add_credits,
 657         .set_credits = smb2_set_credits,
 658         .get_credits_field = smb2_get_credits_field,
 659         .get_credits = smb2_get_credits,
 660         .get_next_mid = smb2_get_next_mid,
 661         .read_data_offset = smb2_read_data_offset,
 662         .read_data_length = smb2_read_data_length,
 663         .map_error = map_smb2_to_linux_error,
 664         .find_mid = smb2_find_mid,
 665         .check_message = smb2_check_message,
 666         .dump_detail = smb2_dump_detail,
 667         .clear_stats = smb2_clear_stats,
 668         .print_stats = smb2_print_stats,
 669         .is_oplock_break = smb2_is_valid_oplock_break,
 670         .need_neg = smb2_need_neg,
 671         .negotiate = smb2_negotiate,
 672         .negotiate_wsize = smb2_negotiate_wsize,
 673         .negotiate_rsize = smb2_negotiate_rsize,
 674         .sess_setup = SMB2_sess_setup,
 675         .logoff = SMB2_logoff,
 676         .tree_connect = SMB2_tcon,
 677         .tree_disconnect = SMB2_tdis,
 678         .is_path_accessible = smb2_is_path_accessible,
 679         .can_echo = smb2_can_echo,
 680         .echo = SMB2_echo,
 681         .query_path_info = smb2_query_path_info,
 682         .get_srv_inum = smb2_get_srv_inum,
 683         .query_file_info = smb2_query_file_info,
 684         .set_path_size = smb2_set_path_size,
 685         .set_file_size = smb2_set_file_size,
 686         .set_file_info = smb2_set_file_info,
 687         .mkdir = smb2_mkdir,
 688         .mkdir_setinfo = smb2_mkdir_setinfo,
 689         .rmdir = smb2_rmdir,
 690         .unlink = smb2_unlink,
 691         .rename = smb2_rename_path,
 692         .create_hardlink = smb2_create_hardlink,
 693         .query_symlink = smb2_query_symlink,
 694         .open = smb2_open_file,
 695         .set_fid = smb2_set_fid,
 696         .close = smb2_close_file,
 697         .flush = smb2_flush_file,
 698         .async_readv = smb2_async_readv,
 699         .async_writev = smb2_async_writev,
 700         .sync_read = smb2_sync_read,
 701         .sync_write = smb2_sync_write,
 702         .query_dir_first = smb2_query_dir_first,
 703         .query_dir_next = smb2_query_dir_next,
 704         .close_dir = smb2_close_dir,
 705         .calc_smb_size = smb2_calc_size,
 706         .is_status_pending = smb2_is_status_pending,
 707         .oplock_response = smb2_oplock_response,
 708         .queryfs = smb2_queryfs,
 709         .mand_lock = smb2_mand_lock,
 710         .mand_unlock_range = smb2_unlock_range,
 711         .push_mand_locks = smb2_push_mandatory_locks,
 712         .get_lease_key = smb2_get_lease_key,
 713         .set_lease_key = smb2_set_lease_key,
 714         .new_lease_key = smb2_new_lease_key,
 715         .calc_signature = smb2_calc_signature,
 716 };
 717
 718
 719 struct smb_version_operations smb30_operations = {
 720         .compare_fids = smb2_compare_fids,
 721         .setup_request = smb2_setup_request,
 722         .setup_async_request = smb2_setup_async_request,
 723         .check_receive = smb2_check_receive,
 724         .add_credits = smb2_add_credits,
 725         .set_credits = smb2_set_credits,
 726         .get_credits_field = smb2_get_credits_field,
 727         .get_credits = smb2_get_credits,
 728         .get_next_mid = smb2_get_next_mid,
 729         .read_data_offset = smb2_read_data_offset,
 730         .read_data_length = smb2_read_data_length,
 731         .map_error = map_smb2_to_linux_error,
 732         .find_mid = smb2_find_mid,
 733         .check_message = smb2_check_message,
 734         .dump_detail = smb2_dump_detail,
 735         .clear_stats = smb2_clear_stats,
 736         .print_stats = smb2_print_stats,
 737         .dump_share_caps = smb2_dump_share_caps,
 738         .is_oplock_break = smb2_is_valid_oplock_break,
 739         .need_neg = smb2_need_neg,
 740         .negotiate = smb2_negotiate,
 741         .negotiate_wsize = smb2_negotiate_wsize,
 742         .negotiate_rsize = smb2_negotiate_rsize,
 743         .sess_setup = SMB2_sess_setup,
 744         .logoff = SMB2_logoff,
 745         .tree_connect = SMB2_tcon,
 746         .tree_disconnect = SMB2_tdis,
 747         .is_path_accessible = smb2_is_path_accessible,
 748         .can_echo = smb2_can_echo,
 749         .echo = SMB2_echo,
 750         .query_path_info = smb2_query_path_info,
 751         .get_srv_inum = smb2_get_srv_inum,
 752         .query_file_info = smb2_query_file_info,
 753         .set_path_size = smb2_set_path_size,
 754         .set_file_size = smb2_set_file_size,
 755         .set_file_info = smb2_set_file_info,
 756         .mkdir = smb2_mkdir,
 757         .mkdir_setinfo = smb2_mkdir_setinfo,
 758         .rmdir = smb2_rmdir,
 759         .unlink = smb2_unlink,
 760         .rename = smb2_rename_path,
 761         .create_hardlink = smb2_create_hardlink,
 762         .query_symlink = smb2_query_symlink,
 763         .open = smb2_open_file,
 764         .set_fid = smb2_set_fid,
 765         .close = smb2_close_file,
 766         .flush = smb2_flush_file,
 767         .async_readv = smb2_async_readv,
 768         .async_writev = smb2_async_writev,
 769         .sync_read = smb2_sync_read,
 770         .sync_write = smb2_sync_write,
 771         .query_dir_first = smb2_query_dir_first,
 772         .query_dir_next = smb2_query_dir_next,
 773         .close_dir = smb2_close_dir,
 774         .calc_smb_size = smb2_calc_size,
 775         .is_status_pending = smb2_is_status_pending,
 776         .oplock_response = smb2_oplock_response,
 777         .queryfs = smb2_queryfs,
 778         .mand_lock = smb2_mand_lock,
 779         .mand_unlock_range = smb2_unlock_range,
 780         .push_mand_locks = smb2_push_mandatory_locks,
 781         .get_lease_key = smb2_get_lease_key,
 782         .set_lease_key = smb2_set_lease_key,
 783         .new_lease_key = smb2_new_lease_key,
 784         .generate_signingkey = generate_smb3signingkey,
 785         .calc_signature = smb3_calc_signature,
 786 };
 787
 788 struct smb_version_values smb20_values = {
 789         .version_string = SMB20_VERSION_STRING,
 790         .protocol_id = SMB20_PROT_ID,
 791         .req_capabilities = 0, /* MBZ */
 792         .large_lock_type = 0,
 793         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
 794         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
 795         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
 796         .header_size = sizeof(struct smb2_hdr),
 797         .max_header_size = MAX_SMB2_HDR_SIZE,
 798         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
 799         .lock_cmd = SMB2_LOCK,
 800         .cap_unix = 0,
 801         .cap_nt_find = SMB2_NT_FIND,
 802         .cap_large_files = SMB2_LARGE_FILES,
 803         .oplock_read = SMB2_OPLOCK_LEVEL_II,
 804         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
 805         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
 806 };
 807
 808 struct smb_version_values smb21_values = {
 809         .version_string = SMB21_VERSION_STRING,
 810         .protocol_id = SMB21_PROT_ID,
 811         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
 812         .large_lock_type = 0,
 813         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
 814         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
 815         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
 816         .header_size = sizeof(struct smb2_hdr),
 817         .max_header_size = MAX_SMB2_HDR_SIZE,
 818         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
 819         .lock_cmd = SMB2_LOCK,
 820         .cap_unix = 0,
 821         .cap_nt_find = SMB2_NT_FIND,
 822         .cap_large_files = SMB2_LARGE_FILES,
 823         .oplock_read = SMB2_OPLOCK_LEVEL_II,
 824         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
 825         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
 826 };
 827
 828 struct smb_version_values smb30_values = {
 829         .version_string = SMB30_VERSION_STRING,
 830         .protocol_id = SMB30_PROT_ID,
 831         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
 832         .large_lock_type = 0,
 833         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
 834         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
 835         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
 836         .header_size = sizeof(struct smb2_hdr),
 837         .max_header_size = MAX_SMB2_HDR_SIZE,
 838         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
 839         .lock_cmd = SMB2_LOCK,
 840         .cap_unix = 0,
 841         .cap_nt_find = SMB2_NT_FIND,
 842         .cap_large_files = SMB2_LARGE_FILES,
 843         .oplock_read = SMB2_OPLOCK_LEVEL_II,
 844         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
 845         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
 846 };
 847
 848 struct smb_version_values smb302_values = {
 849         .version_string = SMB302_VERSION_STRING,
 850         .protocol_id = SMB302_PROT_ID,
 851         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
 852         .large_lock_type = 0,
 853         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
 854         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
 855         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
 856         .header_size = sizeof(struct smb2_hdr),
 857         .max_header_size = MAX_SMB2_HDR_SIZE,
 858         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
 859         .lock_cmd = SMB2_LOCK,
 860         .cap_unix = 0,
 861         .cap_nt_find = SMB2_NT_FIND,
 862         .cap_large_files = SMB2_LARGE_FILES,
 863         .oplock_read = SMB2_OPLOCK_LEVEL_II,
 864         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
 865         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
 866 };