source3/locking/locking.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Locking functions
   4    Copyright (C) Andrew Tridgell 1992-2000
   5    Copyright (C) Jeremy Allison 1992-2006
   6    Copyright (C) Volker Lendecke 2005
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21    Revision History:
  22
  23    12 aug 96: Erik.Devriendt@te6.siemens.be
  24    added support for shared memory implementation of share mode locking
  25
  26    May 1997. Jeremy Allison (jallison@whistle.com). Modified share mode
  27    locking to deal with multiple share modes per open file.
  28
  29    September 1997. Jeremy Allison (jallison@whistle.com). Added oplock
  30    support.
  31
  32    rewritten completely to use new tdb code. Tridge, Dec '99
  33
  34    Added POSIX locking support. Jeremy Allison (jeremy@valinux.com), Apr. 2000.
  35    Added Unix Extensions POSIX locking support. Jeremy Allison Mar 2006.
  36 */
  37
  38 #include "includes.h"
  39 #include "system/filesys.h"
  40 #include "locking/proto.h"
  41 #include "smbd/globals.h"
  42 #include "dbwrap/dbwrap.h"
  43 #include "dbwrap/dbwrap_open.h"
  44 #include "../libcli/security/security.h"
  45 #include "serverid.h"
  46 #include "messages.h"
  47 #include "util_tdb.h"
  48 #include "../librpc/gen_ndr/ndr_open_files.h"
  49
  50 #undef DBGC_CLASS
  51 #define DBGC_CLASS DBGC_LOCKING
  52
  53 #define NO_LOCKING_COUNT (-1)
  54
  55 /****************************************************************************
  56  Debugging aids :-).
  57 ****************************************************************************/
  58
  59 const char *lock_type_name(enum brl_type lock_type)
  60 {
  61         switch (lock_type) {
  62                 case READ_LOCK:
  63                         return "READ";
  64                 case WRITE_LOCK:
  65                         return "WRITE";
  66                 case PENDING_READ_LOCK:
  67                         return "PENDING_READ";
  68                 case PENDING_WRITE_LOCK:
  69                         return "PENDING_WRITE";
  70                 default:
  71                         return "other";
  72         }
  73 }
  74
  75 const char *lock_flav_name(enum brl_flavour lock_flav)
  76 {
  77         return (lock_flav == WINDOWS_LOCK) ? "WINDOWS_LOCK" : "POSIX_LOCK";
  78 }
  79
  80 /****************************************************************************
  81  Utility function called to see if a file region is locked.
  82  Called in the read/write codepath.
  83 ****************************************************************************/
  84
  85 void init_strict_lock_struct(files_struct *fsp,
  86                                 uint64_t smblctx,
  87                                 br_off start,
  88                                 br_off size,
  89                                 enum brl_type lock_type,
  90                                 struct lock_struct *plock)
  91 {
  92         SMB_ASSERT(lock_type == READ_LOCK || lock_type == WRITE_LOCK);
  93
  94         plock->context.smblctx = smblctx;
  95         plock->context.tid = fsp->conn->cnum;
  96         plock->context.pid = messaging_server_id(fsp->conn->sconn->msg_ctx);
  97         plock->start = start;
  98         plock->size = size;
  99         plock->fnum = fsp->fnum;
 100         plock->lock_type = lock_type;
 101         plock->lock_flav = lp_posix_cifsu_locktype(fsp);
 102 }
 103
 104 bool strict_lock_default(files_struct *fsp, struct lock_struct *plock)
 105 {
 106         int strict_locking = lp_strict_locking(fsp->conn->params);
 107         bool ret = False;
 108
 109         if (plock->size == 0) {
 110                 return True;
 111         }
 112
 113         if (!lp_locking(fsp->conn->params) || !strict_locking) {
 114                 return True;
 115         }
 116
 117         if (strict_locking == Auto) {
 118                 if  (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type) && (plock->lock_type == READ_LOCK || plock->lock_type == WRITE_LOCK)) {
 119                         DEBUG(10,("is_locked: optimisation - exclusive oplock on file %s\n", fsp_str_dbg(fsp)));
 120                         ret = True;
 121                 } else if ((fsp->oplock_type == LEVEL_II_OPLOCK) &&
 122                            (plock->lock_type == READ_LOCK)) {
 123                         DEBUG(10,("is_locked: optimisation - level II oplock on file %s\n", fsp_str_dbg(fsp)));
 124                         ret = True;
 125                 } else {
 126                         struct byte_range_lock *br_lck;
 127
 128                         br_lck = brl_get_locks_readonly(fsp);
 129                         if (!br_lck) {
 130                                 return True;
 131                         }
 132                         ret = brl_locktest(br_lck,
 133                                         plock->context.smblctx,
 134                                         plock->context.pid,
 135                                         plock->start,
 136                                         plock->size,
 137                                         plock->lock_type,
 138                                         plock->lock_flav);
 139                 }
 140         } else {
 141                 struct byte_range_lock *br_lck;
 142
 143                 br_lck = brl_get_locks_readonly(fsp);
 144                 if (!br_lck) {
 145                         return True;
 146                 }
 147                 ret = brl_locktest(br_lck,
 148                                 plock->context.smblctx,
 149                                 plock->context.pid,
 150                                 plock->start,
 151                                 plock->size,
 152                                 plock->lock_type,
 153                                 plock->lock_flav);
 154         }
 155
 156         DEBUG(10,("strict_lock_default: flavour = %s brl start=%.0f "
 157                         "len=%.0f %s for fnum %d file %s\n",
 158                         lock_flav_name(plock->lock_flav),
 159                         (double)plock->start, (double)plock->size,
 160                         ret ? "unlocked" : "locked",
 161                         plock->fnum, fsp_str_dbg(fsp)));
 162
 163         return ret;
 164 }
 165
 166 void strict_unlock_default(files_struct *fsp, struct lock_struct *plock)
 167 {
 168 }
 169
 170 /****************************************************************************
 171  Find out if a lock could be granted - return who is blocking us if we can't.
 172 ****************************************************************************/
 173
 174 NTSTATUS query_lock(files_struct *fsp,
 175                         uint64_t *psmblctx,
 176                         uint64_t *pcount,
 177                         uint64_t *poffset,
 178                         enum brl_type *plock_type,
 179                         enum brl_flavour lock_flav)
 180 {
 181         struct byte_range_lock *br_lck = NULL;
 182
 183         if (!fsp->can_lock) {
 184                 return fsp->is_directory ? NT_STATUS_INVALID_DEVICE_REQUEST : NT_STATUS_INVALID_HANDLE;
 185         }
 186
 187         if (!lp_locking(fsp->conn->params)) {
 188                 return NT_STATUS_OK;
 189         }
 190
 191         br_lck = brl_get_locks_readonly(fsp);
 192         if (!br_lck) {
 193                 return NT_STATUS_NO_MEMORY;
 194         }
 195
 196         return brl_lockquery(br_lck,
 197                         psmblctx,
 198                         messaging_server_id(fsp->conn->sconn->msg_ctx),
 199                         poffset,
 200                         pcount,
 201                         plock_type,
 202                         lock_flav);
 203 }
 204
 205 static void increment_current_lock_count(files_struct *fsp,
 206     enum brl_flavour lock_flav)
 207 {
 208         if (lock_flav == WINDOWS_LOCK &&
 209             fsp->current_lock_count != NO_LOCKING_COUNT) {
 210                 /* blocking ie. pending, locks also count here,
 211                  * as this is an efficiency counter to avoid checking
 212                  * the lock db. on close. JRA. */
 213
 214                 fsp->current_lock_count++;
 215         } else {
 216                 /* Notice that this has had a POSIX lock request.
 217                  * We can't count locks after this so forget them.
 218                  */
 219                 fsp->current_lock_count = NO_LOCKING_COUNT;
 220         }
 221 }
 222
 223 static void decrement_current_lock_count(files_struct *fsp,
 224     enum brl_flavour lock_flav)
 225 {
 226         if (lock_flav == WINDOWS_LOCK &&
 227             fsp->current_lock_count != NO_LOCKING_COUNT) {
 228                 SMB_ASSERT(fsp->current_lock_count > 0);
 229                 fsp->current_lock_count--;
 230         }
 231 }
 232
 233 /****************************************************************************
 234  Utility function called by locking requests.
 235 ****************************************************************************/
 236
 237 struct byte_range_lock *do_lock(struct messaging_context *msg_ctx,
 238                         files_struct *fsp,
 239                         uint64_t smblctx,
 240                         uint64_t count,
 241                         uint64_t offset,
 242                         enum brl_type lock_type,
 243                         enum brl_flavour lock_flav,
 244                         bool blocking_lock,
 245                         NTSTATUS *perr,
 246                         uint64_t *psmblctx,
 247                         struct blocking_lock_record *blr)
 248 {
 249         struct byte_range_lock *br_lck = NULL;
 250
 251         /* silently return ok on print files as we don't do locking there */
 252         if (fsp->print_file) {
 253                 *perr = NT_STATUS_OK;
 254                 return NULL;
 255         }
 256
 257         if (!fsp->can_lock) {
 258                 *perr = fsp->is_directory ? NT_STATUS_INVALID_DEVICE_REQUEST : NT_STATUS_INVALID_HANDLE;
 259                 return NULL;
 260         }
 261
 262         if (!lp_locking(fsp->conn->params)) {
 263                 *perr = NT_STATUS_OK;
 264                 return NULL;
 265         }
 266
 267         /* NOTE! 0 byte long ranges ARE allowed and should be stored  */
 268
 269         DEBUG(10,("do_lock: lock flavour %s lock type %s start=%.0f len=%.0f "
 270                 "blocking_lock=%s requested for fnum %d file %s\n",
 271                 lock_flav_name(lock_flav), lock_type_name(lock_type),
 272                 (double)offset, (double)count, blocking_lock ? "true" :
 273                 "false", fsp->fnum, fsp_str_dbg(fsp)));
 274
 275         br_lck = brl_get_locks(talloc_tos(), fsp);
 276         if (!br_lck) {
 277                 *perr = NT_STATUS_NO_MEMORY;
 278                 return NULL;
 279         }
 280
 281         *perr = brl_lock(msg_ctx,
 282                         br_lck,
 283                         smblctx,
 284                         messaging_server_id(fsp->conn->sconn->msg_ctx),
 285                         offset,
 286                         count,
 287                         lock_type,
 288                         lock_flav,
 289                         blocking_lock,
 290                         psmblctx,
 291                         blr);
 292
 293         DEBUG(10, ("do_lock: returning status=%s\n", nt_errstr(*perr)));
 294
 295         increment_current_lock_count(fsp, lock_flav);
 296         return br_lck;
 297 }
 298
 299 /****************************************************************************
 300  Utility function called by unlocking requests.
 301 ****************************************************************************/
 302
 303 NTSTATUS do_unlock(struct messaging_context *msg_ctx,
 304                         files_struct *fsp,
 305                         uint64_t smblctx,
 306                         uint64_t count,
 307                         uint64_t offset,
 308                         enum brl_flavour lock_flav)
 309 {
 310         bool ok = False;
 311         struct byte_range_lock *br_lck = NULL;
 312
 313         if (!fsp->can_lock) {
 314                 return fsp->is_directory ? NT_STATUS_INVALID_DEVICE_REQUEST : NT_STATUS_INVALID_HANDLE;
 315         }
 316
 317         if (!lp_locking(fsp->conn->params)) {
 318                 return NT_STATUS_OK;
 319         }
 320
 321         DEBUG(10,("do_unlock: unlock start=%.0f len=%.0f requested for fnum %d file %s\n",
 322                   (double)offset, (double)count, fsp->fnum,
 323                   fsp_str_dbg(fsp)));
 324
 325         br_lck = brl_get_locks(talloc_tos(), fsp);
 326         if (!br_lck) {
 327                 return NT_STATUS_NO_MEMORY;
 328         }
 329
 330         ok = brl_unlock(msg_ctx,
 331                         br_lck,
 332                         smblctx,
 333                         messaging_server_id(fsp->conn->sconn->msg_ctx),
 334                         offset,
 335                         count,
 336                         lock_flav);
 337
 338         TALLOC_FREE(br_lck);
 339
 340         if (!ok) {
 341                 DEBUG(10,("do_unlock: returning ERRlock.\n" ));
 342                 return NT_STATUS_RANGE_NOT_LOCKED;
 343         }
 344
 345         decrement_current_lock_count(fsp, lock_flav);
 346         return NT_STATUS_OK;
 347 }
 348
 349 /****************************************************************************
 350  Cancel any pending blocked locks.
 351 ****************************************************************************/
 352
 353 NTSTATUS do_lock_cancel(files_struct *fsp,
 354                         uint64 smblctx,
 355                         uint64_t count,
 356                         uint64_t offset,
 357                         enum brl_flavour lock_flav,
 358                         struct blocking_lock_record *blr)
 359 {
 360         bool ok = False;
 361         struct byte_range_lock *br_lck = NULL;
 362
 363         if (!fsp->can_lock) {
 364                 return fsp->is_directory ?
 365                         NT_STATUS_INVALID_DEVICE_REQUEST : NT_STATUS_INVALID_HANDLE;
 366         }
 367
 368         if (!lp_locking(fsp->conn->params)) {
 369                 return NT_STATUS_DOS(ERRDOS, ERRcancelviolation);
 370         }
 371
 372         DEBUG(10,("do_lock_cancel: cancel start=%.0f len=%.0f requested for fnum %d file %s\n",
 373                   (double)offset, (double)count, fsp->fnum,
 374                   fsp_str_dbg(fsp)));
 375
 376         br_lck = brl_get_locks(talloc_tos(), fsp);
 377         if (!br_lck) {
 378                 return NT_STATUS_NO_MEMORY;
 379         }
 380
 381         ok = brl_lock_cancel(br_lck,
 382                         smblctx,
 383                         messaging_server_id(fsp->conn->sconn->msg_ctx),
 384                         offset,
 385                         count,
 386                         lock_flav,
 387                         blr);
 388
 389         TALLOC_FREE(br_lck);
 390
 391         if (!ok) {
 392                 DEBUG(10,("do_lock_cancel: returning ERRcancelviolation.\n" ));
 393                 return NT_STATUS_DOS(ERRDOS, ERRcancelviolation);
 394         }
 395
 396         decrement_current_lock_count(fsp, lock_flav);
 397         return NT_STATUS_OK;
 398 }
 399
 400 /****************************************************************************
 401  Remove any locks on this fd. Called from file_close().
 402 ****************************************************************************/
 403
 404 void locking_close_file(struct messaging_context *msg_ctx,
 405                         files_struct *fsp,
 406                         enum file_close_type close_type)
 407 {
 408         struct byte_range_lock *br_lck;
 409
 410         if (!lp_locking(fsp->conn->params)) {
 411                 return;
 412         }
 413
 414         /* If we have not outstanding locks or pending
 415          * locks then we don't need to look in the lock db.
 416          */
 417
 418         if (fsp->current_lock_count == 0) {
 419                 return;
 420         }
 421
 422         br_lck = brl_get_locks(talloc_tos(),fsp);
 423
 424         if (br_lck) {
 425                 cancel_pending_lock_requests_by_fid(fsp, br_lck, close_type);
 426                 brl_close_fnum(msg_ctx, br_lck);
 427                 TALLOC_FREE(br_lck);
 428         }
 429 }
 430
 431 /*******************************************************************
 432  Print out a share mode.
 433 ********************************************************************/
 434
 435 char *share_mode_str(TALLOC_CTX *ctx, int num, const struct share_mode_entry *e)
 436 {
 437         return talloc_asprintf(ctx, "share_mode_entry[%d]: "
 438                  "pid = %s, share_access = 0x%x, private_options = 0x%x, "
 439                  "access_mask = 0x%x, mid = 0x%llx, type= 0x%x, gen_id = %llu, "
 440                  "uid = %u, flags = %u, file_id %s, name_hash = 0x%x",
 441                  num,
 442                  procid_str_static(&e->pid),
 443                  e->share_access, e->private_options,
 444                  e->access_mask, (unsigned long long)e->op_mid,
 445                  e->op_type, (unsigned long long)e->share_file_id,
 446                  (unsigned int)e->uid, (unsigned int)e->flags,
 447                  file_id_string_tos(&e->id),
 448                  (unsigned int)e->name_hash);
 449 }
 450
 451 /*******************************************************************
 452  Fetch a share mode where we know one MUST exist. This call reference
 453  counts it internally to allow for nested lock fetches.
 454 ********************************************************************/
 455
 456 struct share_mode_lock *get_share_mode_lock(TALLOC_CTX *mem_ctx,
 457                                             const struct file_id id)
 458 {
 459         return get_share_mode_lock_fresh(mem_ctx, id, NULL, NULL, NULL);
 460 }
 461
 462 /*******************************************************************
 463  Sets the service name and filename for rename.
 464  At this point we emit "file renamed" messages to all
 465  process id's that have this file open.
 466  Based on an initial code idea from SATOH Fumiyasu <fumiya@samba.gr.jp>
 467 ********************************************************************/
 468
 469 bool rename_share_filename(struct messaging_context *msg_ctx,
 470                         struct share_mode_lock *lck,
 471                         const char *servicepath,
 472                         uint32_t orig_name_hash,
 473                         uint32_t new_name_hash,
 474                         const struct smb_filename *smb_fname_dst)
 475 {
 476         struct share_mode_data *d = lck->data;
 477         size_t sp_len;
 478         size_t bn_len;
 479         size_t sn_len;
 480         size_t msg_len;
 481         char *frm = NULL;
 482         int i;
 483         bool strip_two_chars = false;
 484         bool has_stream = smb_fname_dst->stream_name != NULL;
 485
 486         DEBUG(10, ("rename_share_filename: servicepath %s newname %s\n",
 487                    servicepath, smb_fname_dst->base_name));
 488
 489         /*
 490          * rename_internal_fsp() and rename_internals() add './' to
 491          * head of newname if newname does not contain a '/'.
 492          */
 493         if (smb_fname_dst->base_name[0] &&
 494             smb_fname_dst->base_name[1] &&
 495             smb_fname_dst->base_name[0] == '.' &&
 496             smb_fname_dst->base_name[1] == '/') {
 497                 strip_two_chars = true;
 498         }
 499
 500         d->servicepath = talloc_strdup(d, servicepath);
 501         d->base_name = talloc_strdup(d, smb_fname_dst->base_name +
 502                                        (strip_two_chars ? 2 : 0));
 503         d->stream_name = talloc_strdup(d, smb_fname_dst->stream_name);
 504         if (d->base_name == NULL ||
 505             (has_stream && d->stream_name == NULL) ||
 506             d->servicepath == NULL) {
 507                 DEBUG(0, ("rename_share_filename: talloc failed\n"));
 508                 return False;
 509         }
 510         d->modified = True;
 511
 512         sp_len = strlen(d->servicepath);
 513         bn_len = strlen(d->base_name);
 514         sn_len = has_stream ? strlen(d->stream_name) : 0;
 515
 516         msg_len = MSG_FILE_RENAMED_MIN_SIZE + sp_len + 1 + bn_len + 1 +
 517             sn_len + 1;
 518
 519         /* Set up the name changed message. */
 520         frm = talloc_array(d, char, msg_len);
 521         if (!frm) {
 522                 return False;
 523         }
 524
 525         push_file_id_24(frm, &d->id);
 526
 527         DEBUG(10,("rename_share_filename: msg_len = %u\n", (unsigned int)msg_len ));
 528
 529         strlcpy(&frm[24],
 530                 d->servicepath ? d->servicepath : "",
 531                 sp_len+1);
 532         strlcpy(&frm[24 + sp_len + 1],
 533                 d->base_name ? d->base_name : "",
 534                 bn_len+1);
 535         strlcpy(&frm[24 + sp_len + 1 + bn_len + 1],
 536                 d->stream_name ? d->stream_name : "",
 537                 sn_len+1);
 538
 539         /* Send the messages. */
 540         for (i=0; i<d->num_share_modes; i++) {
 541                 struct share_mode_entry *se = &d->share_modes[i];
 542                 if (!is_valid_share_mode_entry(se)) {
 543                         continue;
 544                 }
 545
 546                 /* If this is a hardlink to the inode
 547                    with a different name, skip this. */
 548                 if (se->name_hash != orig_name_hash) {
 549                         continue;
 550                 }
 551
 552                 se->name_hash = new_name_hash;
 553
 554                 /* But not to ourselves... */
 555                 if (procid_is_me(&se->pid)) {
 556                         continue;
 557                 }
 558
 559                 DEBUG(10,("rename_share_filename: sending rename message to "
 560                           "pid %s file_id %s sharepath %s base_name %s "
 561                           "stream_name %s\n",
 562                           procid_str_static(&se->pid),
 563                           file_id_string_tos(&d->id),
 564                           d->servicepath, d->base_name,
 565                         has_stream ? d->stream_name : ""));
 566
 567                 messaging_send_buf(msg_ctx, se->pid, MSG_SMB_FILE_RENAME,
 568                                    (uint8 *)frm, msg_len);
 569         }
 570
 571         return True;
 572 }
 573
 574 void get_file_infos(struct file_id id,
 575                     uint32_t name_hash,
 576                     bool *delete_on_close,
 577                     struct timespec *write_time)
 578 {
 579         struct share_mode_lock *lck;
 580
 581         if (delete_on_close) {
 582                 *delete_on_close = false;
 583         }
 584
 585         if (write_time) {
 586                 ZERO_STRUCTP(write_time);
 587         }
 588
 589         if (!(lck = fetch_share_mode_unlocked(talloc_tos(), id))) {
 590                 return;
 591         }
 592
 593         if (delete_on_close) {
 594                 *delete_on_close = is_delete_on_close_set(lck, name_hash);
 595         }
 596
 597         if (write_time) {
 598                 struct timespec wt;
 599
 600                 wt = lck->data->changed_write_time;
 601                 if (null_timespec(wt)) {
 602                         wt = lck->data->old_write_time;
 603                 }
 604
 605                 *write_time = wt;
 606         }
 607
 608         TALLOC_FREE(lck);
 609 }
 610
 611 bool is_valid_share_mode_entry(const struct share_mode_entry *e)
 612 {
 613         int num_props = 0;
 614
 615         num_props += ((e->op_type == NO_OPLOCK) ? 1 : 0);
 616         num_props += (EXCLUSIVE_OPLOCK_TYPE(e->op_type) ? 1 : 0);
 617         num_props += (LEVEL_II_OPLOCK_TYPE(e->op_type) ? 1 : 0);
 618
 619         SMB_ASSERT(num_props <= 1);
 620         return (num_props != 0);
 621 }
 622
 623 bool is_deferred_open_entry(const struct share_mode_entry *e)
 624 {
 625         return (e->op_type == DEFERRED_OPEN_ENTRY);
 626 }
 627
 628 /*******************************************************************
 629  Fill a share mode entry.
 630 ********************************************************************/
 631
 632 static void fill_share_mode_entry(struct share_mode_entry *e,
 633                                   files_struct *fsp,
 634                                   uid_t uid, uint64_t mid, uint16 op_type)
 635 {
 636         ZERO_STRUCTP(e);
 637         e->pid = messaging_server_id(fsp->conn->sconn->msg_ctx);
 638         e->share_access = fsp->share_access;
 639         e->private_options = fsp->fh->private_options;
 640         e->access_mask = fsp->access_mask;
 641         e->op_mid = mid;
 642         e->op_type = op_type;
 643         e->time.tv_sec = fsp->open_time.tv_sec;
 644         e->time.tv_usec = fsp->open_time.tv_usec;
 645         e->id = fsp->file_id;
 646         e->share_file_id = fsp->fh->gen_id;
 647         e->uid = (uint32)uid;
 648         e->flags = fsp->posix_open ? SHARE_MODE_FLAG_POSIX_OPEN : 0;
 649         e->name_hash = fsp->name_hash;
 650 }
 651
 652 static void fill_deferred_open_entry(struct share_mode_entry *e,
 653                                      const struct timeval request_time,
 654                                      struct file_id id,
 655                                      struct server_id pid,
 656                                      uint64_t mid)
 657 {
 658         ZERO_STRUCTP(e);
 659         e->pid = pid;
 660         e->op_mid = mid;
 661         e->op_type = DEFERRED_OPEN_ENTRY;
 662         e->time.tv_sec = request_time.tv_sec;
 663         e->time.tv_usec = request_time.tv_usec;
 664         e->id = id;
 665         e->uid = (uint32)-1;
 666         e->flags = 0;
 667 }
 668
 669 static void add_share_mode_entry(struct share_mode_data *d,
 670                                  const struct share_mode_entry *entry)
 671 {
 672         ADD_TO_ARRAY(d, struct share_mode_entry, *entry,
 673                      &d->share_modes, &d->num_share_modes);
 674         d->modified = True;
 675 }
 676
 677 void set_share_mode(struct share_mode_lock *lck, files_struct *fsp,
 678                     uid_t uid, uint64_t mid, uint16 op_type)
 679 {
 680         struct share_mode_entry entry;
 681         fill_share_mode_entry(&entry, fsp, uid, mid, op_type);
 682         add_share_mode_entry(lck->data, &entry);
 683 }
 684
 685 void add_deferred_open(struct share_mode_lock *lck, uint64_t mid,
 686                        struct timeval request_time,
 687                        struct server_id pid, struct file_id id)
 688 {
 689         struct share_mode_entry entry;
 690         fill_deferred_open_entry(&entry, request_time, id, pid, mid);
 691         add_share_mode_entry(lck->data, &entry);
 692 }
 693
 694 /*******************************************************************
 695  Check if two share mode entries are identical, ignoring oplock
 696  and mid info and desired_access. (Removed paranoia test - it's
 697  not automatically a logic error if they are identical. JRA.)
 698 ********************************************************************/
 699
 700 static bool share_modes_identical(struct share_mode_entry *e1,
 701                                   struct share_mode_entry *e2)
 702 {
 703         /* We used to check for e1->share_access == e2->share_access here
 704            as well as the other fields but 2 different DOS or FCB opens
 705            sharing the same share mode entry may validly differ in
 706            fsp->share_access field. */
 707
 708         return (procid_equal(&e1->pid, &e2->pid) &&
 709                 file_id_equal(&e1->id, &e2->id) &&
 710                 e1->share_file_id == e2->share_file_id );
 711 }
 712
 713 static bool deferred_open_identical(struct share_mode_entry *e1,
 714                                     struct share_mode_entry *e2)
 715 {
 716         return (procid_equal(&e1->pid, &e2->pid) &&
 717                 (e1->op_mid == e2->op_mid) &&
 718                 file_id_equal(&e1->id, &e2->id));
 719 }
 720
 721 static struct share_mode_entry *find_share_mode_entry(struct share_mode_data *d,
 722                                                       struct share_mode_entry *entry)
 723 {
 724         int i;
 725
 726         for (i=0; i<d->num_share_modes; i++) {
 727                 struct share_mode_entry *e = &d->share_modes[i];
 728                 if (is_valid_share_mode_entry(entry) &&
 729                     is_valid_share_mode_entry(e) &&
 730                     share_modes_identical(e, entry)) {
 731                         return e;
 732                 }
 733                 if (is_deferred_open_entry(entry) &&
 734                     is_deferred_open_entry(e) &&
 735                     deferred_open_identical(e, entry)) {
 736                         return e;
 737                 }
 738         }
 739         return NULL;
 740 }
 741
 742 /*******************************************************************
 743  Del the share mode of a file for this process. Return the number of
 744  entries left.
 745 ********************************************************************/
 746
 747 bool del_share_mode(struct share_mode_lock *lck, files_struct *fsp)
 748 {
 749         struct share_mode_entry entry, *e;
 750
 751         /* Don't care about the pid owner being correct here - just a search. */
 752         fill_share_mode_entry(&entry, fsp, (uid_t)-1, 0, NO_OPLOCK);
 753
 754         e = find_share_mode_entry(lck->data, &entry);
 755         if (e == NULL) {
 756                 return False;
 757         }
 758         *e = lck->data->share_modes[lck->data->num_share_modes-1];
 759         lck->data->num_share_modes -= 1;
 760         lck->data->modified = True;
 761         return True;
 762 }
 763
 764 void del_deferred_open_entry(struct share_mode_lock *lck, uint64_t mid,
 765                              struct server_id pid)
 766 {
 767         struct share_mode_entry entry, *e;
 768
 769         fill_deferred_open_entry(&entry, timeval_zero(),
 770                                  lck->data->id, pid, mid);
 771
 772         e = find_share_mode_entry(lck->data, &entry);
 773         if (e == NULL) {
 774                 return;
 775         }
 776         *e = lck->data->share_modes[lck->data->num_share_modes-1];
 777         lck->data->num_share_modes -= 1;
 778         lck->data->modified = True;
 779 }
 780
 781 /*******************************************************************
 782  Remove an oplock mid and mode entry from a share mode.
 783 ********************************************************************/
 784
 785 bool remove_share_oplock(struct share_mode_lock *lck, files_struct *fsp)
 786 {
 787         struct share_mode_entry entry, *e;
 788
 789         /* Don't care about the pid owner being correct here - just a search. */
 790         fill_share_mode_entry(&entry, fsp, (uid_t)-1, 0, NO_OPLOCK);
 791
 792         e = find_share_mode_entry(lck->data, &entry);
 793         if (e == NULL) {
 794                 return False;
 795         }
 796
 797         if (EXCLUSIVE_OPLOCK_TYPE(e->op_type)) {
 798                 /*
 799                  * Going from exclusive or batch,
 800                  * we always go through FAKE_LEVEL_II
 801                  * first.
 802                  */
 803                 if (!EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
 804                         smb_panic("remove_share_oplock: logic error");
 805                 }
 806                 e->op_type = FAKE_LEVEL_II_OPLOCK;
 807         } else {
 808                 e->op_type = NO_OPLOCK;
 809         }
 810         lck->data->modified = True;
 811         return True;
 812 }
 813
 814 /*******************************************************************
 815  Downgrade a oplock type from exclusive to level II.
 816 ********************************************************************/
 817
 818 bool downgrade_share_oplock(struct share_mode_lock *lck, files_struct *fsp)
 819 {
 820         struct share_mode_entry entry, *e;
 821
 822         /* Don't care about the pid owner being correct here - just a search. */
 823         fill_share_mode_entry(&entry, fsp, (uid_t)-1, 0, NO_OPLOCK);
 824
 825         e = find_share_mode_entry(lck->data, &entry);
 826         if (e == NULL) {
 827                 return False;
 828         }
 829
 830         e->op_type = LEVEL_II_OPLOCK;
 831         lck->data->modified = True;
 832         return True;
 833 }
 834
 835 /*************************************************************************
 836  Return a talloced copy of a struct security_unix_token. NULL on fail.
 837  (Should this be in locking.c.... ?).
 838 *************************************************************************/
 839
 840 static struct security_unix_token *copy_unix_token(TALLOC_CTX *ctx, const struct security_unix_token *tok)
 841 {
 842         struct security_unix_token *cpy;
 843
 844         cpy = talloc(ctx, struct security_unix_token);
 845         if (!cpy) {
 846                 return NULL;
 847         }
 848
 849         cpy->uid = tok->uid;
 850         cpy->gid = tok->gid;
 851         cpy->ngroups = tok->ngroups;
 852         if (tok->ngroups) {
 853                 /* Make this a talloc child of cpy. */
 854                 cpy->groups = (gid_t *)talloc_memdup(
 855                         cpy, tok->groups, tok->ngroups * sizeof(gid_t));
 856                 if (!cpy->groups) {
 857                         TALLOC_FREE(cpy);
 858                         return NULL;
 859                 }
 860         }
 861         return cpy;
 862 }
 863
 864 /****************************************************************************
 865  Adds a delete on close token.
 866 ****************************************************************************/
 867
 868 static bool add_delete_on_close_token(struct share_mode_data *d,
 869                         uint32_t name_hash,
 870                         const struct security_unix_token *tok)
 871 {
 872         struct delete_token *tmp, *dtl;
 873
 874         tmp = talloc_realloc(d, d->delete_tokens, struct delete_token,
 875                              d->num_delete_tokens+1);
 876         if (tmp == NULL) {
 877                 return false;
 878         }
 879         d->delete_tokens = tmp;
 880         dtl = &d->delete_tokens[d->num_delete_tokens];
 881
 882         dtl->name_hash = name_hash;
 883         dtl->delete_token = copy_unix_token(d->delete_tokens, tok);
 884         if (dtl->delete_token == NULL) {
 885                 return false;
 886         }
 887         d->num_delete_tokens += 1;
 888         d->modified = true;
 889         return true;
 890 }
 891
 892 /****************************************************************************
 893  Sets the delete on close flag over all share modes on this file.
 894  Modify the share mode entry for all files open
 895  on this device and inode to tell other smbds we have
 896  changed the delete on close flag. This will be noticed
 897  in the close code, the last closer will delete the file
 898  if flag is set.
 899  This makes a copy of any struct security_unix_token into the
 900  lck entry. This function is used when the lock is already granted.
 901 ****************************************************************************/
 902
 903 void set_delete_on_close_lck(files_struct *fsp,
 904                         struct share_mode_lock *lck,
 905                         bool delete_on_close,
 906                         const struct security_unix_token *tok)
 907 {
 908         struct share_mode_data *d = lck->data;
 909         int i;
 910         bool ret;
 911
 912         if (delete_on_close) {
 913                 SMB_ASSERT(tok != NULL);
 914         } else {
 915                 SMB_ASSERT(tok == NULL);
 916         }
 917
 918         for (i=0; i<d->num_delete_tokens; i++) {
 919                 struct delete_token *dt = &d->delete_tokens[i];
 920                 if (dt->name_hash == fsp->name_hash) {
 921                         d->modified = true;
 922                         if (delete_on_close == false) {
 923                                 /* Delete this entry. */
 924                                 TALLOC_FREE(dt->delete_token);
 925                                 *dt = d->delete_tokens[
 926                                         d->num_delete_tokens-1];
 927                                 d->num_delete_tokens -= 1;
 928                                 return;
 929                         }
 930                         /* Replace this token with the
 931                            given tok. */
 932                         TALLOC_FREE(dt->delete_token);
 933                         dt->delete_token = copy_unix_token(dt, tok);
 934                         SMB_ASSERT(dt->delete_token != NULL);
 935                 }
 936         }
 937
 938         if (!delete_on_close) {
 939                 /* Nothing to delete - not found. */
 940                 return;
 941         }
 942
 943         ret = add_delete_on_close_token(lck->data, fsp->name_hash, tok);
 944         SMB_ASSERT(ret);
 945 }
 946
 947 bool set_delete_on_close(files_struct *fsp, bool delete_on_close, const struct security_unix_token *tok)
 948 {
 949         struct share_mode_lock *lck;
 950
 951         DEBUG(10,("set_delete_on_close: %s delete on close flag for "
 952                   "fnum = %d, file %s\n",
 953                   delete_on_close ? "Adding" : "Removing", fsp->fnum,
 954                   fsp_str_dbg(fsp)));
 955
 956         lck = get_share_mode_lock(talloc_tos(), fsp->file_id);
 957         if (lck == NULL) {
 958                 return False;
 959         }
 960
 961         set_delete_on_close_lck(fsp, lck, delete_on_close,
 962                         delete_on_close ? tok : NULL);
 963
 964         if (fsp->is_directory) {
 965                 SMB_ASSERT(!is_ntfs_stream_smb_fname(fsp->fsp_name));
 966                 send_stat_cache_delete_message(fsp->conn->sconn->msg_ctx,
 967                                                fsp->fsp_name->base_name);
 968         }
 969
 970         TALLOC_FREE(lck);
 971
 972         fsp->delete_on_close = delete_on_close;
 973
 974         return True;
 975 }
 976
 977 const struct security_unix_token *get_delete_on_close_token(struct share_mode_lock *lck, uint32_t name_hash)
 978 {
 979         int i;
 980
 981         DEBUG(10,("get_delete_on_close_token: name_hash = 0x%x\n",
 982                         (unsigned int)name_hash ));
 983
 984         for (i=0; i<lck->data->num_delete_tokens; i++) {
 985                 struct delete_token *dt = &lck->data->delete_tokens[i];
 986                 DEBUG(10,("get_delete_on_close_token: dtl->name_hash = 0x%x\n",
 987                                 (unsigned int)dt->name_hash ));
 988                 if (dt->name_hash == name_hash) {
 989                         return dt->delete_token;
 990                 }
 991         }
 992         return NULL;
 993 }
 994
 995 bool is_delete_on_close_set(struct share_mode_lock *lck, uint32_t name_hash)
 996 {
 997         return (get_delete_on_close_token(lck, name_hash) != NULL);
 998 }
 999
1000 bool set_sticky_write_time(struct file_id fileid, struct timespec write_time)
1001 {
1002         struct share_mode_lock *lck;
1003
1004         DEBUG(5,("set_sticky_write_time: %s id=%s\n",
1005                  timestring(talloc_tos(),
1006                             convert_timespec_to_time_t(write_time)),
1007                  file_id_string_tos(&fileid)));
1008
1009         lck = get_share_mode_lock(talloc_tos(), fileid);
1010         if (lck == NULL) {
1011                 return False;
1012         }
1013
1014         if (timespec_compare(&lck->data->changed_write_time, &write_time) != 0) {
1015                 lck->data->modified = True;
1016                 lck->data->changed_write_time = write_time;
1017         }
1018
1019         TALLOC_FREE(lck);
1020         return True;
1021 }
1022
1023 bool set_write_time(struct file_id fileid, struct timespec write_time)
1024 {
1025         struct share_mode_lock *lck;
1026
1027         DEBUG(5,("set_write_time: %s id=%s\n",
1028                  timestring(talloc_tos(),
1029                             convert_timespec_to_time_t(write_time)),
1030                  file_id_string_tos(&fileid)));
1031
1032         lck = get_share_mode_lock(talloc_tos(), fileid);
1033         if (lck == NULL) {
1034                 return False;
1035         }
1036
1037         if (timespec_compare(&lck->data->old_write_time, &write_time) != 0) {
1038                 lck->data->modified = True;
1039                 lck->data->old_write_time = write_time;
1040         }
1041
1042         TALLOC_FREE(lck);
1043         return True;
1044 }