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         struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
 381
 382         cfile->fid.persistent_fid = fid->persistent_fid;
 383         cfile->fid.volatile_fid = fid->volatile_fid;
 384         server->ops->set_oplock_level(cinode, oplock);
 385         cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
 386 }
 387
 388 static void
 389 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
 390                 struct cifs_fid *fid)
 391 {
 392         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 393 }
 394
 395 static int
 396 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
 397                 struct cifs_fid *fid)
 398 {
 399         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 400 }
 401
 402 static unsigned int
 403 smb2_read_data_offset(char *buf)
 404 {
 405         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 406         return rsp->DataOffset;
 407 }
 408
 409 static unsigned int
 410 smb2_read_data_length(char *buf)
 411 {
 412         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 413         return le32_to_cpu(rsp->DataLength);
 414 }
 415
 416
 417 static int
 418 smb2_sync_read(const unsigned int xid, struct cifsFileInfo *cfile,
 419                struct cifs_io_parms *parms, unsigned int *bytes_read,
 420                char **buf, int *buf_type)
 421 {
 422         parms->persistent_fid = cfile->fid.persistent_fid;
 423         parms->volatile_fid = cfile->fid.volatile_fid;
 424         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
 425 }
 426
 427 static int
 428 smb2_sync_write(const unsigned int xid, struct cifsFileInfo *cfile,
 429                 struct cifs_io_parms *parms, unsigned int *written,
 430                 struct kvec *iov, unsigned long nr_segs)
 431 {
 432
 433         parms->persistent_fid = cfile->fid.persistent_fid;
 434         parms->volatile_fid = cfile->fid.volatile_fid;
 435         return SMB2_write(xid, parms, written, iov, nr_segs);
 436 }
 437
 438 static int
 439 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
 440                    struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
 441 {
 442         __le64 eof = cpu_to_le64(size);
 443         return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
 444                             cfile->fid.volatile_fid, cfile->pid, &eof);
 445 }
 446
 447 static int
 448 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
 449                      const char *path, struct cifs_sb_info *cifs_sb,
 450                      struct cifs_fid *fid, __u16 search_flags,
 451                      struct cifs_search_info *srch_inf)
 452 {
 453         __le16 *utf16_path;
 454         int rc;
 455         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 456         struct cifs_open_parms oparms;
 457
 458         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 459         if (!utf16_path)
 460                 return -ENOMEM;
 461
 462         oparms.tcon = tcon;
 463         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
 464         oparms.disposition = FILE_OPEN;
 465         oparms.create_options = 0;
 466         oparms.fid = fid;
 467         oparms.reconnect = false;
 468
 469         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 470         kfree(utf16_path);
 471         if (rc) {
 472                 cifs_dbg(VFS, "open dir failed\n");
 473                 return rc;
 474         }
 475
 476         srch_inf->entries_in_buffer = 0;
 477         srch_inf->index_of_last_entry = 0;
 478
 479         rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
 480                                   fid->volatile_fid, 0, srch_inf);
 481         if (rc) {
 482                 cifs_dbg(VFS, "query directory failed\n");
 483                 SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 484         }
 485         return rc;
 486 }
 487
 488 static int
 489 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
 490                     struct cifs_fid *fid, __u16 search_flags,
 491                     struct cifs_search_info *srch_inf)
 492 {
 493         return SMB2_query_directory(xid, tcon, fid->persistent_fid,
 494                                     fid->volatile_fid, 0, srch_inf);
 495 }
 496
 497 static int
 498 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
 499                struct cifs_fid *fid)
 500 {
 501         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 502 }
 503
 504 /*
 505 * If we negotiate SMB2 protocol and get STATUS_PENDING - update
 506 * the number of credits and return true. Otherwise - return false.
 507 */
 508 static bool
 509 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server, int length)
 510 {
 511         struct smb2_hdr *hdr = (struct smb2_hdr *)buf;
 512
 513         if (hdr->Status != STATUS_PENDING)
 514                 return false;
 515
 516         if (!length) {
 517                 spin_lock(&server->req_lock);
 518                 server->credits += le16_to_cpu(hdr->CreditRequest);
 519                 spin_unlock(&server->req_lock);
 520                 wake_up(&server->request_q);
 521         }
 522
 523         return true;
 524 }
 525
 526 static int
 527 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
 528                      struct cifsInodeInfo *cinode)
 529 {
 530         if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
 531                 return SMB2_lease_break(0, tcon, cinode->lease_key,
 532                                         smb2_get_lease_state(cinode));
 533
 534         return SMB2_oplock_break(0, tcon, fid->persistent_fid,
 535                                  fid->volatile_fid,
 536                                  CIFS_CACHE_READ(cinode) ? 1 : 0);
 537 }
 538
 539 static int
 540 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
 541              struct kstatfs *buf)
 542 {
 543         int rc;
 544         __le16 srch_path = 0; /* Null - open root of share */
 545         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 546         struct cifs_open_parms oparms;
 547         struct cifs_fid fid;
 548
 549         oparms.tcon = tcon;
 550         oparms.desired_access = FILE_READ_ATTRIBUTES;
 551         oparms.disposition = FILE_OPEN;
 552         oparms.create_options = 0;
 553         oparms.fid = &fid;
 554         oparms.reconnect = false;
 555
 556         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
 557         if (rc)
 558                 return rc;
 559         buf->f_type = SMB2_MAGIC_NUMBER;
 560         rc = SMB2_QFS_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 561                            buf);
 562         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 563         return rc;
 564 }
 565
 566 static bool
 567 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
 568 {
 569         return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
 570                ob1->fid.volatile_fid == ob2->fid.volatile_fid;
 571 }
 572
 573 static int
 574 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
 575                __u64 length, __u32 type, int lock, int unlock, bool wait)
 576 {
 577         if (unlock && !lock)
 578                 type = SMB2_LOCKFLAG_UNLOCK;
 579         return SMB2_lock(xid, tlink_tcon(cfile->tlink),
 580                          cfile->fid.persistent_fid, cfile->fid.volatile_fid,
 581                          current->tgid, length, offset, type, wait);
 582 }
 583
 584 static void
 585 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
 586 {
 587         memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
 588 }
 589
 590 static void
 591 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
 592 {
 593         memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
 594 }
 595
 596 static void
 597 smb2_new_lease_key(struct cifs_fid *fid)
 598 {
 599         get_random_bytes(fid->lease_key, SMB2_LEASE_KEY_SIZE);
 600 }
 601
 602 static int
 603 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
 604                    const char *full_path, char **target_path,
 605                    struct cifs_sb_info *cifs_sb)
 606 {
 607         int rc;
 608         __le16 *utf16_path;
 609         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 610         struct cifs_open_parms oparms;
 611         struct cifs_fid fid;
 612         struct smb2_err_rsp *err_buf = NULL;
 613         struct smb2_symlink_err_rsp *symlink;
 614         unsigned int sub_len, sub_offset;
 615
 616         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
 617
 618         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 619         if (!utf16_path)
 620                 return -ENOMEM;
 621
 622         oparms.tcon = tcon;
 623         oparms.desired_access = FILE_READ_ATTRIBUTES;
 624         oparms.disposition = FILE_OPEN;
 625         oparms.create_options = 0;
 626         oparms.fid = &fid;
 627         oparms.reconnect = false;
 628
 629         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_buf);
 630
 631         if (!rc || !err_buf) {
 632                 kfree(utf16_path);
 633                 return -ENOENT;
 634         }
 635         /* open must fail on symlink - reset rc */
 636         rc = 0;
 637         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
 638         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
 639         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
 640         *target_path = cifs_strndup_from_utf16(
 641                                 (char *)symlink->PathBuffer + sub_offset,
 642                                 sub_len, true, cifs_sb->local_nls);
 643         if (!(*target_path)) {
 644                 kfree(utf16_path);
 645                 return -ENOMEM;
 646         }
 647         convert_delimiter(*target_path, '/');
 648         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
 649         kfree(utf16_path);
 650         return rc;
 651 }
 652
 653 static void
 654 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
 655 {
 656         oplock &= 0xFF;
 657         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
 658                 return;
 659         if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
 660                 cinode->oplock = CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG |
 661                                  CIFS_CACHE_HANDLE_FLG;
 662                 cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
 663                          &cinode->vfs_inode);
 664         } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
 665                 cinode->oplock = CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG;
 666                 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
 667                          &cinode->vfs_inode);
 668         } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
 669                 cinode->oplock = CIFS_CACHE_READ_FLG;
 670                 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
 671                          &cinode->vfs_inode);
 672         } else
 673                 cinode->oplock = 0;
 674 }
 675
 676 static void
 677 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
 678 {
 679         char message[5] = {0};
 680
 681         oplock &= 0xFF;
 682         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
 683                 return;
 684
 685         cinode->oplock = 0;
 686         if (oplock & SMB2_LEASE_READ_CACHING_HE) {
 687                 cinode->oplock |= CIFS_CACHE_READ_FLG;
 688                 strcat(message, "R");
 689         }
 690         if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
 691                 cinode->oplock |= CIFS_CACHE_HANDLE_FLG;
 692                 strcat(message, "H");
 693         }
 694         if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
 695                 cinode->oplock |= CIFS_CACHE_WRITE_FLG;
 696                 strcat(message, "W");
 697         }
 698         if (!cinode->oplock)
 699                 strcat(message, "None");
 700         cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
 701                  &cinode->vfs_inode);
 702 }
 703
 704 static bool
 705 smb2_is_read_op(__u32 oplock)
 706 {
 707         return oplock == SMB2_OPLOCK_LEVEL_II;
 708 }
 709
 710 static bool
 711 smb21_is_read_op(__u32 oplock)
 712 {
 713         return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
 714                !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
 715 }
 716
 717 struct smb_version_operations smb20_operations = {
 718         .compare_fids = smb2_compare_fids,
 719         .setup_request = smb2_setup_request,
 720         .setup_async_request = smb2_setup_async_request,
 721         .check_receive = smb2_check_receive,
 722         .add_credits = smb2_add_credits,
 723         .set_credits = smb2_set_credits,
 724         .get_credits_field = smb2_get_credits_field,
 725         .get_credits = smb2_get_credits,
 726         .get_next_mid = smb2_get_next_mid,
 727         .read_data_offset = smb2_read_data_offset,
 728         .read_data_length = smb2_read_data_length,
 729         .map_error = map_smb2_to_linux_error,
 730         .find_mid = smb2_find_mid,
 731         .check_message = smb2_check_message,
 732         .dump_detail = smb2_dump_detail,
 733         .clear_stats = smb2_clear_stats,
 734         .print_stats = smb2_print_stats,
 735         .is_oplock_break = smb2_is_valid_oplock_break,
 736         .need_neg = smb2_need_neg,
 737         .negotiate = smb2_negotiate,
 738         .negotiate_wsize = smb2_negotiate_wsize,
 739         .negotiate_rsize = smb2_negotiate_rsize,
 740         .sess_setup = SMB2_sess_setup,
 741         .logoff = SMB2_logoff,
 742         .tree_connect = SMB2_tcon,
 743         .tree_disconnect = SMB2_tdis,
 744         .is_path_accessible = smb2_is_path_accessible,
 745         .can_echo = smb2_can_echo,
 746         .echo = SMB2_echo,
 747         .query_path_info = smb2_query_path_info,
 748         .get_srv_inum = smb2_get_srv_inum,
 749         .query_file_info = smb2_query_file_info,
 750         .set_path_size = smb2_set_path_size,
 751         .set_file_size = smb2_set_file_size,
 752         .set_file_info = smb2_set_file_info,
 753         .mkdir = smb2_mkdir,
 754         .mkdir_setinfo = smb2_mkdir_setinfo,
 755         .rmdir = smb2_rmdir,
 756         .unlink = smb2_unlink,
 757         .rename = smb2_rename_path,
 758         .create_hardlink = smb2_create_hardlink,
 759         .query_symlink = smb2_query_symlink,
 760         .open = smb2_open_file,
 761         .set_fid = smb2_set_fid,
 762         .close = smb2_close_file,
 763         .flush = smb2_flush_file,
 764         .async_readv = smb2_async_readv,
 765         .async_writev = smb2_async_writev,
 766         .sync_read = smb2_sync_read,
 767         .sync_write = smb2_sync_write,
 768         .query_dir_first = smb2_query_dir_first,
 769         .query_dir_next = smb2_query_dir_next,
 770         .close_dir = smb2_close_dir,
 771         .calc_smb_size = smb2_calc_size,
 772         .is_status_pending = smb2_is_status_pending,
 773         .oplock_response = smb2_oplock_response,
 774         .queryfs = smb2_queryfs,
 775         .mand_lock = smb2_mand_lock,
 776         .mand_unlock_range = smb2_unlock_range,
 777         .push_mand_locks = smb2_push_mandatory_locks,
 778         .get_lease_key = smb2_get_lease_key,
 779         .set_lease_key = smb2_set_lease_key,
 780         .new_lease_key = smb2_new_lease_key,
 781         .calc_signature = smb2_calc_signature,
 782         .is_read_op = smb2_is_read_op,
 783         .set_oplock_level = smb2_set_oplock_level,
 784 };
 785
 786 struct smb_version_operations smb21_operations = {
 787         .compare_fids = smb2_compare_fids,
 788         .setup_request = smb2_setup_request,
 789         .setup_async_request = smb2_setup_async_request,
 790         .check_receive = smb2_check_receive,
 791         .add_credits = smb2_add_credits,
 792         .set_credits = smb2_set_credits,
 793         .get_credits_field = smb2_get_credits_field,
 794         .get_credits = smb2_get_credits,
 795         .get_next_mid = smb2_get_next_mid,
 796         .read_data_offset = smb2_read_data_offset,
 797         .read_data_length = smb2_read_data_length,
 798         .map_error = map_smb2_to_linux_error,
 799         .find_mid = smb2_find_mid,
 800         .check_message = smb2_check_message,
 801         .dump_detail = smb2_dump_detail,
 802         .clear_stats = smb2_clear_stats,
 803         .print_stats = smb2_print_stats,
 804         .is_oplock_break = smb2_is_valid_oplock_break,
 805         .need_neg = smb2_need_neg,
 806         .negotiate = smb2_negotiate,
 807         .negotiate_wsize = smb2_negotiate_wsize,
 808         .negotiate_rsize = smb2_negotiate_rsize,
 809         .sess_setup = SMB2_sess_setup,
 810         .logoff = SMB2_logoff,
 811         .tree_connect = SMB2_tcon,
 812         .tree_disconnect = SMB2_tdis,
 813         .is_path_accessible = smb2_is_path_accessible,
 814         .can_echo = smb2_can_echo,
 815         .echo = SMB2_echo,
 816         .query_path_info = smb2_query_path_info,
 817         .get_srv_inum = smb2_get_srv_inum,
 818         .query_file_info = smb2_query_file_info,
 819         .set_path_size = smb2_set_path_size,
 820         .set_file_size = smb2_set_file_size,
 821         .set_file_info = smb2_set_file_info,
 822         .mkdir = smb2_mkdir,
 823         .mkdir_setinfo = smb2_mkdir_setinfo,
 824         .rmdir = smb2_rmdir,
 825         .unlink = smb2_unlink,
 826         .rename = smb2_rename_path,
 827         .create_hardlink = smb2_create_hardlink,
 828         .query_symlink = smb2_query_symlink,
 829         .open = smb2_open_file,
 830         .set_fid = smb2_set_fid,
 831         .close = smb2_close_file,
 832         .flush = smb2_flush_file,
 833         .async_readv = smb2_async_readv,
 834         .async_writev = smb2_async_writev,
 835         .sync_read = smb2_sync_read,
 836         .sync_write = smb2_sync_write,
 837         .query_dir_first = smb2_query_dir_first,
 838         .query_dir_next = smb2_query_dir_next,
 839         .close_dir = smb2_close_dir,
 840         .calc_smb_size = smb2_calc_size,
 841         .is_status_pending = smb2_is_status_pending,
 842         .oplock_response = smb2_oplock_response,
 843         .queryfs = smb2_queryfs,
 844         .mand_lock = smb2_mand_lock,
 845         .mand_unlock_range = smb2_unlock_range,
 846         .push_mand_locks = smb2_push_mandatory_locks,
 847         .get_lease_key = smb2_get_lease_key,
 848         .set_lease_key = smb2_set_lease_key,
 849         .new_lease_key = smb2_new_lease_key,
 850         .calc_signature = smb2_calc_signature,
 851         .is_read_op = smb21_is_read_op,
 852         .set_oplock_level = smb21_set_oplock_level,
 853 };
 854
 855 struct smb_version_operations smb30_operations = {
 856         .compare_fids = smb2_compare_fids,
 857         .setup_request = smb2_setup_request,
 858         .setup_async_request = smb2_setup_async_request,
 859         .check_receive = smb2_check_receive,
 860         .add_credits = smb2_add_credits,
 861         .set_credits = smb2_set_credits,
 862         .get_credits_field = smb2_get_credits_field,
 863         .get_credits = smb2_get_credits,
 864         .get_next_mid = smb2_get_next_mid,
 865         .read_data_offset = smb2_read_data_offset,
 866         .read_data_length = smb2_read_data_length,
 867         .map_error = map_smb2_to_linux_error,
 868         .find_mid = smb2_find_mid,
 869         .check_message = smb2_check_message,
 870         .dump_detail = smb2_dump_detail,
 871         .clear_stats = smb2_clear_stats,
 872         .print_stats = smb2_print_stats,
 873         .dump_share_caps = smb2_dump_share_caps,
 874         .is_oplock_break = smb2_is_valid_oplock_break,
 875         .need_neg = smb2_need_neg,
 876         .negotiate = smb2_negotiate,
 877         .negotiate_wsize = smb2_negotiate_wsize,
 878         .negotiate_rsize = smb2_negotiate_rsize,
 879         .sess_setup = SMB2_sess_setup,
 880         .logoff = SMB2_logoff,
 881         .tree_connect = SMB2_tcon,
 882         .tree_disconnect = SMB2_tdis,
 883         .is_path_accessible = smb2_is_path_accessible,
 884         .can_echo = smb2_can_echo,
 885         .echo = SMB2_echo,
 886         .query_path_info = smb2_query_path_info,
 887         .get_srv_inum = smb2_get_srv_inum,
 888         .query_file_info = smb2_query_file_info,
 889         .set_path_size = smb2_set_path_size,
 890         .set_file_size = smb2_set_file_size,
 891         .set_file_info = smb2_set_file_info,
 892         .mkdir = smb2_mkdir,
 893         .mkdir_setinfo = smb2_mkdir_setinfo,
 894         .rmdir = smb2_rmdir,
 895         .unlink = smb2_unlink,
 896         .rename = smb2_rename_path,
 897         .create_hardlink = smb2_create_hardlink,
 898         .query_symlink = smb2_query_symlink,
 899         .open = smb2_open_file,
 900         .set_fid = smb2_set_fid,
 901         .close = smb2_close_file,
 902         .flush = smb2_flush_file,
 903         .async_readv = smb2_async_readv,
 904         .async_writev = smb2_async_writev,
 905         .sync_read = smb2_sync_read,
 906         .sync_write = smb2_sync_write,
 907         .query_dir_first = smb2_query_dir_first,
 908         .query_dir_next = smb2_query_dir_next,
 909         .close_dir = smb2_close_dir,
 910         .calc_smb_size = smb2_calc_size,
 911         .is_status_pending = smb2_is_status_pending,
 912         .oplock_response = smb2_oplock_response,
 913         .queryfs = smb2_queryfs,
 914         .mand_lock = smb2_mand_lock,
 915         .mand_unlock_range = smb2_unlock_range,
 916         .push_mand_locks = smb2_push_mandatory_locks,
 917         .get_lease_key = smb2_get_lease_key,
 918         .set_lease_key = smb2_set_lease_key,
 919         .new_lease_key = smb2_new_lease_key,
 920         .generate_signingkey = generate_smb3signingkey,
 921         .calc_signature = smb3_calc_signature,
 922         .is_read_op = smb21_is_read_op,
 923         .set_oplock_level = smb21_set_oplock_level,
 924 };
 925
 926 struct smb_version_values smb20_values = {
 927         .version_string = SMB20_VERSION_STRING,
 928         .protocol_id = SMB20_PROT_ID,
 929         .req_capabilities = 0, /* MBZ */
 930         .large_lock_type = 0,
 931         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
 932         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
 933         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
 934         .header_size = sizeof(struct smb2_hdr),
 935         .max_header_size = MAX_SMB2_HDR_SIZE,
 936         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
 937         .lock_cmd = SMB2_LOCK,
 938         .cap_unix = 0,
 939         .cap_nt_find = SMB2_NT_FIND,
 940         .cap_large_files = SMB2_LARGE_FILES,
 941         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
 942         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
 943 };
 944
 945 struct smb_version_values smb21_values = {
 946         .version_string = SMB21_VERSION_STRING,
 947         .protocol_id = SMB21_PROT_ID,
 948         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
 949         .large_lock_type = 0,
 950         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
 951         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
 952         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
 953         .header_size = sizeof(struct smb2_hdr),
 954         .max_header_size = MAX_SMB2_HDR_SIZE,
 955         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
 956         .lock_cmd = SMB2_LOCK,
 957         .cap_unix = 0,
 958         .cap_nt_find = SMB2_NT_FIND,
 959         .cap_large_files = SMB2_LARGE_FILES,
 960         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
 961         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
 962 };
 963
 964 struct smb_version_values smb30_values = {
 965         .version_string = SMB30_VERSION_STRING,
 966         .protocol_id = SMB30_PROT_ID,
 967         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
 968         .large_lock_type = 0,
 969         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
 970         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
 971         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
 972         .header_size = sizeof(struct smb2_hdr),
 973         .max_header_size = MAX_SMB2_HDR_SIZE,
 974         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
 975         .lock_cmd = SMB2_LOCK,
 976         .cap_unix = 0,
 977         .cap_nt_find = SMB2_NT_FIND,
 978         .cap_large_files = SMB2_LARGE_FILES,
 979         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
 980         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
 981 };
 982
 983 struct smb_version_values smb302_values = {
 984         .version_string = SMB302_VERSION_STRING,
 985         .protocol_id = SMB302_PROT_ID,
 986         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU,
 987         .large_lock_type = 0,
 988         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
 989         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
 990         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
 991         .header_size = sizeof(struct smb2_hdr),
 992         .max_header_size = MAX_SMB2_HDR_SIZE,
 993         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
 994         .lock_cmd = SMB2_LOCK,
 995         .cap_unix = 0,
 996         .cap_nt_find = SMB2_NT_FIND,
 997         .cap_large_files = SMB2_LARGE_FILES,
 998         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
 999         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
1000 };