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Fix a scary "fill_share_mode_lock failed" message
[Samba/bb.git] / source / locking / locking.c
blob41fe1c96cc48182896ae6be794ec5a5aa240953d
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 rewrtten 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
40 #undef DBGC_CLASS
41 #define DBGC_CLASS DBGC_LOCKING
42
43 #define NO_LOCKING_COUNT (-1)
44
45 /* the locking database handle */
46 static struct db_context *lock_db;
47
48 /****************************************************************************
49 Debugging aids :-).
50 ****************************************************************************/
51
52 const char *lock_type_name(enum brl_type lock_type)
53 {
54 switch (lock_type) {
55 case READ_LOCK:
56 return "READ";
57 case WRITE_LOCK:
58 return "WRITE";
59 case PENDING_READ_LOCK:
60 return "PENDING_READ";
61 case PENDING_WRITE_LOCK:
62 return "PENDING_WRITE";
63 default:
64 return "other";
65 }
66 }
67
68 const char *lock_flav_name(enum brl_flavour lock_flav)
69 {
70 return (lock_flav == WINDOWS_LOCK) ? "WINDOWS_LOCK" : "POSIX_LOCK";
71 }
72
73 /****************************************************************************
74 Utility function called to see if a file region is locked.
75 Called in the read/write codepath.
76 ****************************************************************************/
77
78 bool is_locked(files_struct *fsp,
79 uint32 smbpid,
80 SMB_BIG_UINT count,
81 SMB_BIG_UINT offset,
82 enum brl_type lock_type)
83 {
84 int strict_locking = lp_strict_locking(fsp->conn->params);
85 enum brl_flavour lock_flav = lp_posix_cifsu_locktype(fsp);
86 bool ret = True;
87
88 if (count == 0) {
89 return False;
90 }
91
92 if (!lp_locking(fsp->conn->params) || !strict_locking) {
93 return False;
94 }
95
96 if (strict_locking == Auto) {
97 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type) && (lock_type == READ_LOCK || lock_type == WRITE_LOCK)) {
98 DEBUG(10,("is_locked: optimisation - exclusive oplock on file %s\n", fsp->fsp_name ));
99 ret = False;
100 } else if ((fsp->oplock_type == LEVEL_II_OPLOCK) &&
101 (lock_type == READ_LOCK)) {
102 DEBUG(10,("is_locked: optimisation - level II oplock on file %s\n", fsp->fsp_name ));
103 ret = False;
104 } else {
105 struct byte_range_lock *br_lck = brl_get_locks_readonly(talloc_tos(), fsp);
106 if (!br_lck) {
107 return False;
108 }
109 ret = !brl_locktest(br_lck,
110 smbpid,
111 procid_self(),
112 offset,
113 count,
114 lock_type,
115 lock_flav);
116 TALLOC_FREE(br_lck);
117 }
118 } else {
119 struct byte_range_lock *br_lck = brl_get_locks_readonly(talloc_tos(), fsp);
120 if (!br_lck) {
121 return False;
122 }
123 ret = !brl_locktest(br_lck,
124 smbpid,
125 procid_self(),
126 offset,
127 count,
128 lock_type,
129 lock_flav);
130 TALLOC_FREE(br_lck);
131 }
132
133 DEBUG(10,("is_locked: flavour = %s brl start=%.0f len=%.0f %s for fnum %d file %s\n",
134 lock_flav_name(lock_flav),
135 (double)offset, (double)count, ret ? "locked" : "unlocked",
136 fsp->fnum, fsp->fsp_name ));
137
138 return ret;
139 }
140
141 /****************************************************************************
142 Find out if a lock could be granted - return who is blocking us if we can't.
143 ****************************************************************************/
144
145 NTSTATUS query_lock(files_struct *fsp,
146 uint32 *psmbpid,
147 SMB_BIG_UINT *pcount,
148 SMB_BIG_UINT *poffset,
149 enum brl_type *plock_type,
150 enum brl_flavour lock_flav)
151 {
152 struct byte_range_lock *br_lck = NULL;
153 NTSTATUS status = NT_STATUS_LOCK_NOT_GRANTED;
154
155 if (!fsp->can_lock) {
156 return fsp->is_directory ? NT_STATUS_INVALID_DEVICE_REQUEST : NT_STATUS_INVALID_HANDLE;
157 }
158
159 if (!lp_locking(fsp->conn->params)) {
160 return NT_STATUS_OK;
161 }
162
163 br_lck = brl_get_locks_readonly(talloc_tos(), fsp);
164 if (!br_lck) {
165 return NT_STATUS_NO_MEMORY;
166 }
167
168 status = brl_lockquery(br_lck,
169 psmbpid,
170 procid_self(),
171 poffset,
172 pcount,
173 plock_type,
174 lock_flav);
175
176 TALLOC_FREE(br_lck);
177 return status;
178 }
179
180 /****************************************************************************
181 Utility function called by locking requests.
182 ****************************************************************************/
183
184 struct byte_range_lock *do_lock(struct messaging_context *msg_ctx,
185 files_struct *fsp,
186 uint32 lock_pid,
187 SMB_BIG_UINT count,
188 SMB_BIG_UINT offset,
189 enum brl_type lock_type,
190 enum brl_flavour lock_flav,
191 bool blocking_lock,
192 NTSTATUS *perr,
193 uint32 *plock_pid)
194 {
195 struct byte_range_lock *br_lck = NULL;
196
197 if (!fsp->can_lock) {
198 *perr = fsp->is_directory ? NT_STATUS_INVALID_DEVICE_REQUEST : NT_STATUS_INVALID_HANDLE;
199 return NULL;
200 }
201
202 if (!lp_locking(fsp->conn->params)) {
203 *perr = NT_STATUS_OK;
204 return NULL;
205 }
206
207 /* NOTE! 0 byte long ranges ARE allowed and should be stored */
208
209 DEBUG(10,("do_lock: lock flavour %s lock type %s start=%.0f len=%.0f requested for fnum %d file %s\n",
210 lock_flav_name(lock_flav), lock_type_name(lock_type),
211 (double)offset, (double)count, fsp->fnum, fsp->fsp_name ));
212
213 br_lck = brl_get_locks(talloc_tos(), fsp);
214 if (!br_lck) {
215 *perr = NT_STATUS_NO_MEMORY;
216 return NULL;
217 }
218
219 *perr = brl_lock(msg_ctx,
220 br_lck,
221 lock_pid,
222 procid_self(),
223 offset,
224 count,
225 lock_type,
226 lock_flav,
227 blocking_lock,
228 plock_pid);
229
230 if (lock_flav == WINDOWS_LOCK &&
231 fsp->current_lock_count != NO_LOCKING_COUNT) {
232 /* blocking ie. pending, locks also count here,
233 * as this is an efficiency counter to avoid checking
234 * the lock db. on close. JRA. */
235
236 fsp->current_lock_count++;
237 } else {
238 /* Notice that this has had a POSIX lock request.
239 * We can't count locks after this so forget them.
240 */
241 fsp->current_lock_count = NO_LOCKING_COUNT;
242 }
243
244 return br_lck;
245 }
246
247 /****************************************************************************
248 Utility function called by unlocking requests.
249 ****************************************************************************/
250
251 NTSTATUS do_unlock(struct messaging_context *msg_ctx,
252 files_struct *fsp,
253 uint32 lock_pid,
254 SMB_BIG_UINT count,
255 SMB_BIG_UINT offset,
256 enum brl_flavour lock_flav)
257 {
258 bool ok = False;
259 struct byte_range_lock *br_lck = NULL;
260
261 if (!fsp->can_lock) {
262 return fsp->is_directory ? NT_STATUS_INVALID_DEVICE_REQUEST : NT_STATUS_INVALID_HANDLE;
263 }
264
265 if (!lp_locking(fsp->conn->params)) {
266 return NT_STATUS_OK;
267 }
268
269 DEBUG(10,("do_unlock: unlock start=%.0f len=%.0f requested for fnum %d file %s\n",
270 (double)offset, (double)count, fsp->fnum, fsp->fsp_name ));
271
272 br_lck = brl_get_locks(talloc_tos(), fsp);
273 if (!br_lck) {
274 return NT_STATUS_NO_MEMORY;
275 }
276
277 ok = brl_unlock(msg_ctx,
278 br_lck,
279 lock_pid,
280 procid_self(),
281 offset,
282 count,
283 lock_flav);
284
285 TALLOC_FREE(br_lck);
286
287 if (!ok) {
288 DEBUG(10,("do_unlock: returning ERRlock.\n" ));
289 return NT_STATUS_RANGE_NOT_LOCKED;
290 }
291
292 if (lock_flav == WINDOWS_LOCK &&
293 fsp->current_lock_count != NO_LOCKING_COUNT) {
294 SMB_ASSERT(fsp->current_lock_count > 0);
295 fsp->current_lock_count--;
296 }
297
298 return NT_STATUS_OK;
299 }
300
301 /****************************************************************************
302 Cancel any pending blocked locks.
303 ****************************************************************************/
304
305 NTSTATUS do_lock_cancel(files_struct *fsp,
306 uint32 lock_pid,
307 SMB_BIG_UINT count,
308 SMB_BIG_UINT offset,
309 enum brl_flavour lock_flav)
310 {
311 bool ok = False;
312 struct byte_range_lock *br_lck = NULL;
313
314 if (!fsp->can_lock) {
315 return fsp->is_directory ?
316 NT_STATUS_INVALID_DEVICE_REQUEST : NT_STATUS_INVALID_HANDLE;
317 }
318
319 if (!lp_locking(fsp->conn->params)) {
320 return NT_STATUS_DOS(ERRDOS, ERRcancelviolation);
321 }
322
323 DEBUG(10,("do_lock_cancel: cancel start=%.0f len=%.0f requested for fnum %d file %s\n",
324 (double)offset, (double)count, fsp->fnum, fsp->fsp_name ));
325
326 br_lck = brl_get_locks(talloc_tos(), fsp);
327 if (!br_lck) {
328 return NT_STATUS_NO_MEMORY;
329 }
330
331 ok = brl_lock_cancel(br_lck,
332 lock_pid,
333 procid_self(),
334 offset,
335 count,
336 lock_flav);
337
338 TALLOC_FREE(br_lck);
339
340 if (!ok) {
341 DEBUG(10,("do_lock_cancel: returning ERRcancelviolation.\n" ));
342 return NT_STATUS_DOS(ERRDOS, ERRcancelviolation);
343 }
344
345 if (lock_flav == WINDOWS_LOCK &&
346 fsp->current_lock_count != NO_LOCKING_COUNT) {
347 SMB_ASSERT(fsp->current_lock_count > 0);
348 fsp->current_lock_count--;
349 }
350
351 return NT_STATUS_OK;
352 }
353
354 /****************************************************************************
355 Remove any locks on this fd. Called from file_close().
356 ****************************************************************************/
357
358 void locking_close_file(struct messaging_context *msg_ctx,
359 files_struct *fsp)
360 {
361 struct byte_range_lock *br_lck;
362
363 if (!lp_locking(fsp->conn->params)) {
364 return;
365 }
366
367 /* If we have not outstanding locks or pending
368 * locks then we don't need to look in the lock db.
369 */
370
371 if (fsp->current_lock_count == 0) {
372 return;
373 }
374
375 br_lck = brl_get_locks(talloc_tos(),fsp);
376
377 if (br_lck) {
378 cancel_pending_lock_requests_by_fid(fsp, br_lck);
379 brl_close_fnum(msg_ctx, br_lck);
380 TALLOC_FREE(br_lck);
381 }
382 }
383
384 /****************************************************************************
385 Initialise the locking functions.
386 ****************************************************************************/
387
388 static bool locking_init_internal(bool read_only)
389 {
390 brl_init(read_only);
391
392 if (lock_db)
393 return True;
394
395 lock_db = db_open(NULL, lock_path("locking.tdb"),
396 lp_open_files_db_hash_size(),
397 TDB_DEFAULT|TDB_VOLATILE|TDB_CLEAR_IF_FIRST,
398 read_only?O_RDONLY:O_RDWR|O_CREAT, 0644);
399
400 if (!lock_db) {
401 DEBUG(0,("ERROR: Failed to initialise locking database\n"));
402 return False;
403 }
404
405 if (!posix_locking_init(read_only))
406 return False;
407
408 return True;
409 }
410
411 bool locking_init(void)
412 {
413 return locking_init_internal(false);
414 }
415
416 bool locking_init_readonly(void)
417 {
418 return locking_init_internal(true);
419 }
420
421 /*******************************************************************
422 Deinitialize the share_mode management.
423 ******************************************************************/
424
425 bool locking_end(void)
426 {
427 brl_shutdown();
428 TALLOC_FREE(lock_db);
429 return true;
430 }
431
432 /*******************************************************************
433 Form a static locking key for a dev/inode pair.
434 ******************************************************************/
435
436 static TDB_DATA locking_key(const struct file_id *id, struct file_id *tmp)
437 {
438 *tmp = *id;
439 return make_tdb_data((const uint8_t *)tmp, sizeof(*tmp));
440 }
441
442 /*******************************************************************
443 Print out a share mode.
444 ********************************************************************/
445
446 char *share_mode_str(TALLOC_CTX *ctx, int num, const struct share_mode_entry *e)
447 {
448 return talloc_asprintf(ctx, "share_mode_entry[%d]: %s "
449 "pid = %s, share_access = 0x%x, private_options = 0x%x, "
450 "access_mask = 0x%x, mid = 0x%x, type= 0x%x, gen_id = %lu, "
451 "uid = %u, flags = %u, file_id %s",
452 num,
453 e->op_type == UNUSED_SHARE_MODE_ENTRY ? "UNUSED" : "",
454 procid_str_static(&e->pid),
455 e->share_access, e->private_options,
456 e->access_mask, e->op_mid, e->op_type, e->share_file_id,
457 (unsigned int)e->uid, (unsigned int)e->flags,
458 file_id_string_tos(&e->id));
459 }
460
461 /*******************************************************************
462 Print out a share mode table.
463 ********************************************************************/
464
465 static void print_share_mode_table(struct locking_data *data)
466 {
467 int num_share_modes = data->u.s.num_share_mode_entries;
468 struct share_mode_entry *shares =
469 (struct share_mode_entry *)(data + 1);
470 int i;
471
472 for (i = 0; i < num_share_modes; i++) {
473 struct share_mode_entry entry;
474 char *str;
475
476 /*
477 * We need to memcpy the entry here due to alignment
478 * restrictions that are not met when directly accessing
479 * shares[i]
480 */
481
482 memcpy(&entry, &shares[i], sizeof(struct share_mode_entry));
483 str = share_mode_str(talloc_tos(), i, &entry);
484
485 DEBUG(10,("print_share_mode_table: %s\n", str ? str : ""));
486 TALLOC_FREE(str);
487 }
488 }
489
490 /*******************************************************************
491 Get all share mode entries for a dev/inode pair.
492 ********************************************************************/
493
494 static bool parse_share_modes(TDB_DATA dbuf, struct share_mode_lock *lck)
495 {
496 struct locking_data data;
497 int i;
498
499 if (dbuf.dsize < sizeof(struct locking_data)) {
500 smb_panic("parse_share_modes: buffer too short");
501 }
502
503 memcpy(&data, dbuf.dptr, sizeof(data));
504
505 lck->delete_on_close = data.u.s.delete_on_close;
506 lck->old_write_time = data.u.s.old_write_time;
507 lck->changed_write_time = data.u.s.changed_write_time;
508 lck->num_share_modes = data.u.s.num_share_mode_entries;
509
510 DEBUG(10, ("parse_share_modes: delete_on_close: %d, owrt: %s, "
511 "cwrt: %s, tok: %u, num_share_modes: %d\n",
512 lck->delete_on_close,
513 timestring(debug_ctx(),
514 convert_timespec_to_time_t(lck->old_write_time)),
515 timestring(debug_ctx(),
516 convert_timespec_to_time_t(
517 lck->changed_write_time)),
518 (unsigned int)data.u.s.delete_token_size,
519 lck->num_share_modes));
520
521 if ((lck->num_share_modes < 0) || (lck->num_share_modes > 1000000)) {
522 DEBUG(0, ("invalid number of share modes: %d\n",
523 lck->num_share_modes));
524 smb_panic("parse_share_modes: invalid number of share modes");
525 }
526
527 lck->share_modes = NULL;
528
529 if (lck->num_share_modes != 0) {
530
531 if (dbuf.dsize < (sizeof(struct locking_data) +
532 (lck->num_share_modes *
533 sizeof(struct share_mode_entry)))) {
534 smb_panic("parse_share_modes: buffer too short");
535 }
536
537 lck->share_modes = (struct share_mode_entry *)
538 TALLOC_MEMDUP(lck,
539 dbuf.dptr+sizeof(struct locking_data),
540 lck->num_share_modes *
541 sizeof(struct share_mode_entry));
542
543 if (lck->share_modes == NULL) {
544 smb_panic("parse_share_modes: talloc failed");
545 }
546 }
547
548 /* Get any delete token. */
549 if (data.u.s.delete_token_size) {
550 uint8 *p = dbuf.dptr + sizeof(struct locking_data) +
551 (lck->num_share_modes *
552 sizeof(struct share_mode_entry));
553
554 if ((data.u.s.delete_token_size < sizeof(uid_t) + sizeof(gid_t)) ||
555 ((data.u.s.delete_token_size - sizeof(uid_t)) % sizeof(gid_t)) != 0) {
556 DEBUG(0, ("parse_share_modes: invalid token size %d\n",
557 data.u.s.delete_token_size));
558 smb_panic("parse_share_modes: invalid token size");
559 }
560
561 lck->delete_token = TALLOC_P(lck, UNIX_USER_TOKEN);
562 if (!lck->delete_token) {
563 smb_panic("parse_share_modes: talloc failed");
564 }
565
566 /* Copy out the uid and gid. */
567 memcpy(&lck->delete_token->uid, p, sizeof(uid_t));
568 p += sizeof(uid_t);
569 memcpy(&lck->delete_token->gid, p, sizeof(gid_t));
570 p += sizeof(gid_t);
571
572 /* Any supplementary groups ? */
573 lck->delete_token->ngroups = (data.u.s.delete_token_size > (sizeof(uid_t) + sizeof(gid_t))) ?
574 ((data.u.s.delete_token_size -
575 (sizeof(uid_t) + sizeof(gid_t)))/sizeof(gid_t)) : 0;
576
577 if (lck->delete_token->ngroups) {
578 /* Make this a talloc child of lck->delete_token. */
579 lck->delete_token->groups = TALLOC_ARRAY(lck->delete_token, gid_t,
580 lck->delete_token->ngroups);
581 if (!lck->delete_token) {
582 smb_panic("parse_share_modes: talloc failed");
583 }
584
585 for (i = 0; i < lck->delete_token->ngroups; i++) {
586 memcpy(&lck->delete_token->groups[i], p, sizeof(gid_t));
587 p += sizeof(gid_t);
588 }
589 }
590
591 } else {
592 lck->delete_token = NULL;
593 }
594
595 /* Save off the associated service path and filename. */
596 lck->servicepath = (const char *)dbuf.dptr + sizeof(struct locking_data) +
597 (lck->num_share_modes * sizeof(struct share_mode_entry)) +
598 data.u.s.delete_token_size;
599
600 lck->filename = (const char *)dbuf.dptr + sizeof(struct locking_data) +
601 (lck->num_share_modes * sizeof(struct share_mode_entry)) +
602 data.u.s.delete_token_size +
603 strlen(lck->servicepath) + 1;
604
605 /*
606 * Ensure that each entry has a real process attached.
607 */
608
609 for (i = 0; i < lck->num_share_modes; i++) {
610 struct share_mode_entry *entry_p = &lck->share_modes[i];
611 char *str = NULL;
612 if (DEBUGLEVEL >= 10) {
613 str = share_mode_str(NULL, i, entry_p);
614 }
615 DEBUG(10,("parse_share_modes: %s\n",
616 str ? str : ""));
617 if (!process_exists(entry_p->pid)) {
618 DEBUG(10,("parse_share_modes: deleted %s\n",
619 str ? str : ""));
620 entry_p->op_type = UNUSED_SHARE_MODE_ENTRY;
621 lck->modified = True;
622 }
623 TALLOC_FREE(str);
624 }
625
626 return True;
627 }
628
629 static TDB_DATA unparse_share_modes(struct share_mode_lock *lck)
630 {
631 TDB_DATA result;
632 int num_valid = 0;
633 int i;
634 struct locking_data *data;
635 ssize_t offset;
636 ssize_t sp_len;
637 uint32 delete_token_size;
638
639 result.dptr = NULL;
640 result.dsize = 0;
641
642 for (i=0; i<lck->num_share_modes; i++) {
643 if (!is_unused_share_mode_entry(&lck->share_modes[i])) {
644 num_valid += 1;
645 }
646 }
647
648 if (num_valid == 0) {
649 return result;
650 }
651
652 sp_len = strlen(lck->servicepath);
653 delete_token_size = (lck->delete_token ?
654 (sizeof(uid_t) + sizeof(gid_t) + (lck->delete_token->ngroups*sizeof(gid_t))) : 0);
655
656 result.dsize = sizeof(*data) +
657 lck->num_share_modes * sizeof(struct share_mode_entry) +
658 delete_token_size +
659 sp_len + 1 +
660 strlen(lck->filename) + 1;
661 result.dptr = TALLOC_ARRAY(lck, uint8, result.dsize);
662
663 if (result.dptr == NULL) {
664 smb_panic("talloc failed");
665 }
666
667 data = (struct locking_data *)result.dptr;
668 ZERO_STRUCTP(data);
669 data->u.s.num_share_mode_entries = lck->num_share_modes;
670 data->u.s.delete_on_close = lck->delete_on_close;
671 data->u.s.old_write_time = lck->old_write_time;
672 data->u.s.changed_write_time = lck->changed_write_time;
673 data->u.s.delete_token_size = delete_token_size;
674
675 DEBUG(10,("unparse_share_modes: del: %d, owrt: %s cwrt: %s, tok: %u, "
676 "num: %d\n", data->u.s.delete_on_close,
677 timestring(debug_ctx(),
678 convert_timespec_to_time_t(lck->old_write_time)),
679 timestring(debug_ctx(),
680 convert_timespec_to_time_t(
681 lck->changed_write_time)),
682 (unsigned int)data->u.s.delete_token_size,
683 data->u.s.num_share_mode_entries));
684
685 memcpy(result.dptr + sizeof(*data), lck->share_modes,
686 sizeof(struct share_mode_entry)*lck->num_share_modes);
687 offset = sizeof(*data) +
688 sizeof(struct share_mode_entry)*lck->num_share_modes;
689
690 /* Store any delete on close token. */
691 if (lck->delete_token) {
692 uint8 *p = result.dptr + offset;
693
694 memcpy(p, &lck->delete_token->uid, sizeof(uid_t));
695 p += sizeof(uid_t);
696
697 memcpy(p, &lck->delete_token->gid, sizeof(gid_t));
698 p += sizeof(gid_t);
699
700 for (i = 0; i < lck->delete_token->ngroups; i++) {
701 memcpy(p, &lck->delete_token->groups[i], sizeof(gid_t));
702 p += sizeof(gid_t);
703 }
704 offset = p - result.dptr;
705 }
706
707 safe_strcpy((char *)result.dptr + offset, lck->servicepath,
708 result.dsize - offset - 1);
709 offset += sp_len + 1;
710 safe_strcpy((char *)result.dptr + offset, lck->filename,
711 result.dsize - offset - 1);
712
713 if (DEBUGLEVEL >= 10) {
714 print_share_mode_table(data);
715 }
716
717 return result;
718 }
719
720 static int share_mode_lock_destructor(struct share_mode_lock *lck)
721 {
722 NTSTATUS status;
723 TDB_DATA data;
724
725 if (!lck->modified) {
726 return 0;
727 }
728
729 data = unparse_share_modes(lck);
730
731 if (data.dptr == NULL) {
732 if (!lck->fresh) {
733 /* There has been an entry before, delete it */
734
735 status = lck->record->delete_rec(lck->record);
736 if (!NT_STATUS_IS_OK(status)) {
737 DEBUG(0, ("delete_rec returned %s\n",
738 nt_errstr(status)));
739 smb_panic("could not delete share entry");
740 }
741 }
742 goto done;
743 }
744
745 status = lck->record->store(lck->record, data, TDB_REPLACE);
746 if (!NT_STATUS_IS_OK(status)) {
747 DEBUG(0, ("store returned %s\n", nt_errstr(status)));
748 smb_panic("could not store share mode entry");
749 }
750
751 done:
752
753 return 0;
754 }
755
756 static bool fill_share_mode_lock(struct share_mode_lock *lck,
757 struct file_id id,
758 const char *servicepath,
759 const char *fname,
760 TDB_DATA share_mode_data,
761 const struct timespec *old_write_time)
762 {
763 /* Ensure we set every field here as the destructor must be
764 valid even if parse_share_modes fails. */
765
766 lck->servicepath = NULL;
767 lck->filename = NULL;
768 lck->id = id;
769 lck->num_share_modes = 0;
770 lck->share_modes = NULL;
771 lck->delete_token = NULL;
772 lck->delete_on_close = False;
773 ZERO_STRUCT(lck->old_write_time);
774 ZERO_STRUCT(lck->changed_write_time);
775 lck->fresh = False;
776 lck->modified = False;
777
778 lck->fresh = (share_mode_data.dptr == NULL);
779
780 if (lck->fresh) {
781 if (fname == NULL || servicepath == NULL
782 || old_write_time == NULL) {
783 return False;
784 }
785 lck->filename = talloc_strdup(lck, fname);
786 lck->servicepath = talloc_strdup(lck, servicepath);
787 if (lck->filename == NULL || lck->servicepath == NULL) {
788 DEBUG(0, ("talloc failed\n"));
789 return False;
790 }
791 lck->old_write_time = *old_write_time;
792 } else {
793 if (!parse_share_modes(share_mode_data, lck)) {
794 DEBUG(0, ("Could not parse share modes\n"));
795 return False;
796 }
797 }
798
799 return True;
800 }
801
802 struct share_mode_lock *get_share_mode_lock(TALLOC_CTX *mem_ctx,
803 const struct file_id id,
804 const char *servicepath,
805 const char *fname,
806 const struct timespec *old_write_time)
807 {
808 struct share_mode_lock *lck;
809 struct file_id tmp;
810 TDB_DATA key = locking_key(&id, &tmp);
811
812 if (!(lck = TALLOC_P(mem_ctx, struct share_mode_lock))) {
813 DEBUG(0, ("talloc failed\n"));
814 return NULL;
815 }
816
817 if (!(lck->record = lock_db->fetch_locked(lock_db, lck, key))) {
818 DEBUG(3, ("Could not lock share entry\n"));
819 TALLOC_FREE(lck);
820 return NULL;
821 }
822
823 if (!fill_share_mode_lock(lck, id, servicepath, fname,
824 lck->record->value, old_write_time)) {
825 DEBUG(3, ("fill_share_mode_lock failed\n"));
826 TALLOC_FREE(lck);
827 return NULL;
828 }
829
830 talloc_set_destructor(lck, share_mode_lock_destructor);
831
832 return lck;
833 }
834
835 struct share_mode_lock *fetch_share_mode_unlocked(TALLOC_CTX *mem_ctx,
836 const struct file_id id,
837 const char *servicepath,
838 const char *fname)
839 {
840 struct share_mode_lock *lck;
841 struct file_id tmp;
842 TDB_DATA key = locking_key(&id, &tmp);
843 TDB_DATA data;
844
845 if (!(lck = TALLOC_P(mem_ctx, struct share_mode_lock))) {
846 DEBUG(0, ("talloc failed\n"));
847 return NULL;
848 }
849
850 if (lock_db->fetch(lock_db, lck, key, &data) == -1) {
851 DEBUG(3, ("Could not fetch share entry\n"));
852 TALLOC_FREE(lck);
853 return NULL;
854 }
855
856 if (!fill_share_mode_lock(lck, id, servicepath, fname, data, NULL)) {
857 DEBUG(10, ("fetch_share_mode_unlocked: no share_mode record "
858 "around (file not open)\n"));
859 TALLOC_FREE(lck);
860 return NULL;
861 }
862
863 return lck;
864 }
865
866 /*******************************************************************
867 Sets the service name and filename for rename.
868 At this point we emit "file renamed" messages to all
869 process id's that have this file open.
870 Based on an initial code idea from SATOH Fumiyasu <fumiya@samba.gr.jp>
871 ********************************************************************/
872
873 bool rename_share_filename(struct messaging_context *msg_ctx,
874 struct share_mode_lock *lck,
875 const char *servicepath,
876 const char *newname)
877 {
878 size_t sp_len;
879 size_t fn_len;
880 size_t msg_len;
881 char *frm = NULL;
882 int i;
883
884 DEBUG(10, ("rename_share_filename: servicepath %s newname %s\n",
885 servicepath, newname));
886
887 /*
888 * rename_internal_fsp() and rename_internals() add './' to
889 * head of newname if newname does not contain a '/'.
890 */
891 while (newname[0] && newname[1] && newname[0] == '.' && newname[1] == '/') {
892 newname += 2;
893 }
894
895 lck->servicepath = talloc_strdup(lck, servicepath);
896 lck->filename = talloc_strdup(lck, newname);
897 if (lck->filename == NULL || lck->servicepath == NULL) {
898 DEBUG(0, ("rename_share_filename: talloc failed\n"));
899 return False;
900 }
901 lck->modified = True;
902
903 sp_len = strlen(lck->servicepath);
904 fn_len = strlen(lck->filename);
905
906 msg_len = MSG_FILE_RENAMED_MIN_SIZE + sp_len + 1 + fn_len + 1;
907
908 /* Set up the name changed message. */
909 frm = TALLOC_ARRAY(lck, char, msg_len);
910 if (!frm) {
911 return False;
912 }
913
914 push_file_id_16(frm, &lck->id);
915
916 DEBUG(10,("rename_share_filename: msg_len = %u\n", (unsigned int)msg_len ));
917
918 safe_strcpy(&frm[16], lck->servicepath, sp_len);
919 safe_strcpy(&frm[16 + sp_len + 1], lck->filename, fn_len);
920
921 /* Send the messages. */
922 for (i=0; i<lck->num_share_modes; i++) {
923 struct share_mode_entry *se = &lck->share_modes[i];
924 if (!is_valid_share_mode_entry(se)) {
925 continue;
926 }
927 /* But not to ourselves... */
928 if (procid_is_me(&se->pid)) {
929 continue;
930 }
931
932 DEBUG(10,("rename_share_filename: sending rename message to pid %s "
933 "file_id %s sharepath %s newname %s\n",
934 procid_str_static(&se->pid),
935 file_id_string_tos(&lck->id),
936 lck->servicepath, lck->filename ));
937
938 messaging_send_buf(msg_ctx, se->pid, MSG_SMB_FILE_RENAME,
939 (uint8 *)frm, msg_len);
940 }
941
942 return True;
943 }
944
945 void get_file_infos(struct file_id id,
946 bool *delete_on_close,
947 struct timespec *write_time)
948 {
949 struct share_mode_lock *lck;
950
951 if (delete_on_close) {
952 *delete_on_close = false;
953 }
954
955 if (write_time) {
956 ZERO_STRUCTP(write_time);
957 }
958
959 if (!(lck = fetch_share_mode_unlocked(talloc_tos(), id, NULL, NULL))) {
960 return;
961 }
962
963 if (delete_on_close) {
964 *delete_on_close = lck->delete_on_close;
965 }
966
967 if (write_time) {
968 struct timespec wt;
969
970 wt = lck->changed_write_time;
971 if (null_timespec(wt)) {
972 wt = lck->old_write_time;
973 }
974
975 *write_time = wt;
976 }
977
978 TALLOC_FREE(lck);
979 }
980
981 bool is_valid_share_mode_entry(const struct share_mode_entry *e)
982 {
983 int num_props = 0;
984
985 if (e->op_type == UNUSED_SHARE_MODE_ENTRY) {
986 /* cope with dead entries from the process not
987 existing. These should not be considered valid,
988 otherwise we end up doing zero timeout sharing
989 violation */
990 return False;
991 }
992
993 num_props += ((e->op_type == NO_OPLOCK) ? 1 : 0);
994 num_props += (EXCLUSIVE_OPLOCK_TYPE(e->op_type) ? 1 : 0);
995 num_props += (LEVEL_II_OPLOCK_TYPE(e->op_type) ? 1 : 0);
996
997 SMB_ASSERT(num_props <= 1);
998 return (num_props != 0);
999 }
1000
1001 bool is_deferred_open_entry(const struct share_mode_entry *e)
1002 {
1003 return (e->op_type == DEFERRED_OPEN_ENTRY);
1004 }
1005
1006 bool is_unused_share_mode_entry(const struct share_mode_entry *e)
1007 {
1008 return (e->op_type == UNUSED_SHARE_MODE_ENTRY);
1009 }
1010
1011 /*******************************************************************
1012 Fill a share mode entry.
1013 ********************************************************************/
1014
1015 static void fill_share_mode_entry(struct share_mode_entry *e,
1016 files_struct *fsp,
1017 uid_t uid, uint16 mid, uint16 op_type)
1018 {
1019 ZERO_STRUCTP(e);
1020 e->pid = procid_self();
1021 e->share_access = fsp->share_access;
1022 e->private_options = fsp->fh->private_options;
1023 e->access_mask = fsp->access_mask;
1024 e->op_mid = mid;
1025 e->op_type = op_type;
1026 e->time.tv_sec = fsp->open_time.tv_sec;
1027 e->time.tv_usec = fsp->open_time.tv_usec;
1028 e->id = fsp->file_id;
1029 e->share_file_id = fsp->fh->gen_id;
1030 e->uid = (uint32)uid;
1031 e->flags = fsp->posix_open ? SHARE_MODE_FLAG_POSIX_OPEN : 0;
1032 }
1033
1034 static void fill_deferred_open_entry(struct share_mode_entry *e,
1035 const struct timeval request_time,
1036 struct file_id id, uint16 mid)
1037 {
1038 ZERO_STRUCTP(e);
1039 e->pid = procid_self();
1040 e->op_mid = mid;
1041 e->op_type = DEFERRED_OPEN_ENTRY;
1042 e->time.tv_sec = request_time.tv_sec;
1043 e->time.tv_usec = request_time.tv_usec;
1044 e->id = id;
1045 e->uid = (uint32)-1;
1046 e->flags = 0;
1047 }
1048
1049 static void add_share_mode_entry(struct share_mode_lock *lck,
1050 const struct share_mode_entry *entry)
1051 {
1052 int i;
1053
1054 for (i=0; i<lck->num_share_modes; i++) {
1055 struct share_mode_entry *e = &lck->share_modes[i];
1056 if (is_unused_share_mode_entry(e)) {
1057 *e = *entry;
1058 break;
1059 }
1060 }
1061
1062 if (i == lck->num_share_modes) {
1063 /* No unused entry found */
1064 ADD_TO_ARRAY(lck, struct share_mode_entry, *entry,
1065 &lck->share_modes, &lck->num_share_modes);
1066 }
1067 lck->modified = True;
1068 }
1069
1070 void set_share_mode(struct share_mode_lock *lck, files_struct *fsp,
1071 uid_t uid, uint16 mid, uint16 op_type)
1072 {
1073 struct share_mode_entry entry;
1074 fill_share_mode_entry(&entry, fsp, uid, mid, op_type);
1075 add_share_mode_entry(lck, &entry);
1076 }
1077
1078 void add_deferred_open(struct share_mode_lock *lck, uint16 mid,
1079 struct timeval request_time,
1080 struct file_id id)
1081 {
1082 struct share_mode_entry entry;
1083 fill_deferred_open_entry(&entry, request_time, id, mid);
1084 add_share_mode_entry(lck, &entry);
1085 }
1086
1087 /*******************************************************************
1088 Check if two share mode entries are identical, ignoring oplock
1089 and mid info and desired_access. (Removed paranoia test - it's
1090 not automatically a logic error if they are identical. JRA.)
1091 ********************************************************************/
1092
1093 static bool share_modes_identical(struct share_mode_entry *e1,
1094 struct share_mode_entry *e2)
1095 {
1096 /* We used to check for e1->share_access == e2->share_access here
1097 as well as the other fields but 2 different DOS or FCB opens
1098 sharing the same share mode entry may validly differ in
1099 fsp->share_access field. */
1100
1101 return (procid_equal(&e1->pid, &e2->pid) &&
1102 file_id_equal(&e1->id, &e2->id) &&
1103 e1->share_file_id == e2->share_file_id );
1104 }
1105
1106 static bool deferred_open_identical(struct share_mode_entry *e1,
1107 struct share_mode_entry *e2)
1108 {
1109 return (procid_equal(&e1->pid, &e2->pid) &&
1110 (e1->op_mid == e2->op_mid) &&
1111 file_id_equal(&e1->id, &e2->id));
1112 }
1113
1114 static struct share_mode_entry *find_share_mode_entry(struct share_mode_lock *lck,
1115 struct share_mode_entry *entry)
1116 {
1117 int i;
1118
1119 for (i=0; i<lck->num_share_modes; i++) {
1120 struct share_mode_entry *e = &lck->share_modes[i];
1121 if (is_valid_share_mode_entry(entry) &&
1122 is_valid_share_mode_entry(e) &&
1123 share_modes_identical(e, entry)) {
1124 return e;
1125 }
1126 if (is_deferred_open_entry(entry) &&
1127 is_deferred_open_entry(e) &&
1128 deferred_open_identical(e, entry)) {
1129 return e;
1130 }
1131 }
1132 return NULL;
1133 }
1134
1135 /*******************************************************************
1136 Del the share mode of a file for this process. Return the number of
1137 entries left.
1138 ********************************************************************/
1139
1140 bool del_share_mode(struct share_mode_lock *lck, files_struct *fsp)
1141 {
1142 struct share_mode_entry entry, *e;
1143
1144 /* Don't care about the pid owner being correct here - just a search. */
1145 fill_share_mode_entry(&entry, fsp, (uid_t)-1, 0, NO_OPLOCK);
1146
1147 e = find_share_mode_entry(lck, &entry);
1148 if (e == NULL) {
1149 return False;
1150 }
1151
1152 e->op_type = UNUSED_SHARE_MODE_ENTRY;
1153 lck->modified = True;
1154 return True;
1155 }
1156
1157 void del_deferred_open_entry(struct share_mode_lock *lck, uint16 mid)
1158 {
1159 struct share_mode_entry entry, *e;
1160
1161 fill_deferred_open_entry(&entry, timeval_zero(),
1162 lck->id, mid);
1163
1164 e = find_share_mode_entry(lck, &entry);
1165 if (e == NULL) {
1166 return;
1167 }
1168
1169 e->op_type = UNUSED_SHARE_MODE_ENTRY;
1170 lck->modified = True;
1171 }
1172
1173 /*******************************************************************
1174 Remove an oplock mid and mode entry from a share mode.
1175 ********************************************************************/
1176
1177 bool remove_share_oplock(struct share_mode_lock *lck, files_struct *fsp)
1178 {
1179 struct share_mode_entry entry, *e;
1180
1181 /* Don't care about the pid owner being correct here - just a search. */
1182 fill_share_mode_entry(&entry, fsp, (uid_t)-1, 0, NO_OPLOCK);
1183
1184 e = find_share_mode_entry(lck, &entry);
1185 if (e == NULL) {
1186 return False;
1187 }
1188
1189 e->op_mid = 0;
1190 if (EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type)) {
1191 /*
1192 * Going from exclusive or batch,
1193 * we always go through FAKE_LEVEL_II
1194 * first.
1195 */
1196 e->op_type = FAKE_LEVEL_II_OPLOCK;
1197 } else {
1198 e->op_type = NO_OPLOCK;
1199 }
1200 lck->modified = True;
1201 return True;
1202 }
1203
1204 /*******************************************************************
1205 Downgrade a oplock type from exclusive to level II.
1206 ********************************************************************/
1207
1208 bool downgrade_share_oplock(struct share_mode_lock *lck, files_struct *fsp)
1209 {
1210 struct share_mode_entry entry, *e;
1211
1212 /* Don't care about the pid owner being correct here - just a search. */
1213 fill_share_mode_entry(&entry, fsp, (uid_t)-1, 0, NO_OPLOCK);
1214
1215 e = find_share_mode_entry(lck, &entry);
1216 if (e == NULL) {
1217 return False;
1218 }
1219
1220 e->op_type = LEVEL_II_OPLOCK;
1221 lck->modified = True;
1222 return True;
1223 }
1224
1225 /****************************************************************************
1226 Deal with the internal needs of setting the delete on close flag. Note that
1227 as the tdb locking is recursive, it is safe to call this from within
1228 open_file_ntcreate. JRA.
1229 ****************************************************************************/
1230
1231 NTSTATUS can_set_delete_on_close(files_struct *fsp, bool delete_on_close,
1232 uint32 dosmode)
1233 {
1234 if (!delete_on_close) {
1235 return NT_STATUS_OK;
1236 }
1237
1238 /*
1239 * Only allow delete on close for writable files.
1240 */
1241
1242 if ((dosmode & aRONLY) &&
1243 !lp_delete_readonly(SNUM(fsp->conn))) {
1244 DEBUG(10,("can_set_delete_on_close: file %s delete on close "
1245 "flag set but file attribute is readonly.\n",
1246 fsp->fsp_name ));
1247 return NT_STATUS_CANNOT_DELETE;
1248 }
1249
1250 /*
1251 * Only allow delete on close for writable shares.
1252 */
1253
1254 if (!CAN_WRITE(fsp->conn)) {
1255 DEBUG(10,("can_set_delete_on_close: file %s delete on "
1256 "close flag set but write access denied on share.\n",
1257 fsp->fsp_name ));
1258 return NT_STATUS_ACCESS_DENIED;
1259 }
1260
1261 /*
1262 * Only allow delete on close for files/directories opened with delete
1263 * intent.
1264 */
1265
1266 if (!(fsp->access_mask & DELETE_ACCESS)) {
1267 DEBUG(10,("can_set_delete_on_close: file %s delete on "
1268 "close flag set but delete access denied.\n",
1269 fsp->fsp_name ));
1270 return NT_STATUS_ACCESS_DENIED;
1271 }
1272
1273 /* Don't allow delete on close for non-empty directories. */
1274 if (fsp->is_directory) {
1275 return can_delete_directory(fsp->conn, fsp->fsp_name);
1276 }
1277
1278 return NT_STATUS_OK;
1279 }
1280
1281 /*************************************************************************
1282 Return a talloced copy of a UNIX_USER_TOKEN. NULL on fail.
1283 (Should this be in locking.c.... ?).
1284 *************************************************************************/
1285
1286 static UNIX_USER_TOKEN *copy_unix_token(TALLOC_CTX *ctx, const UNIX_USER_TOKEN *tok)
1287 {
1288 UNIX_USER_TOKEN *cpy;
1289
1290 if (tok == NULL) {
1291 return NULL;
1292 }
1293
1294 cpy = TALLOC_P(ctx, UNIX_USER_TOKEN);
1295 if (!cpy) {
1296 return NULL;
1297 }
1298
1299 cpy->uid = tok->uid;
1300 cpy->gid = tok->gid;
1301 cpy->ngroups = tok->ngroups;
1302 if (tok->ngroups) {
1303 /* Make this a talloc child of cpy. */
1304 cpy->groups = TALLOC_ARRAY(cpy, gid_t, tok->ngroups);
1305 if (!cpy->groups) {
1306 return NULL;
1307 }
1308 memcpy(cpy->groups, tok->groups, tok->ngroups * sizeof(gid_t));
1309 }
1310 return cpy;
1311 }
1312
1313 /****************************************************************************
1314 Replace the delete on close token.
1315 ****************************************************************************/
1316
1317 void set_delete_on_close_token(struct share_mode_lock *lck, const UNIX_USER_TOKEN *tok)
1318 {
1319 TALLOC_FREE(lck->delete_token); /* Also deletes groups... */
1320
1321 /* Copy the new token (can be NULL). */
1322 lck->delete_token = copy_unix_token(lck, tok);
1323 lck->modified = True;
1324 }
1325
1326 /****************************************************************************
1327 Sets the delete on close flag over all share modes on this file.
1328 Modify the share mode entry for all files open
1329 on this device and inode to tell other smbds we have
1330 changed the delete on close flag. This will be noticed
1331 in the close code, the last closer will delete the file
1332 if flag is set.
1333 This makes a copy of any UNIX_USER_TOKEN into the
1334 lck entry. This function is used when the lock is already granted.
1335 ****************************************************************************/
1336
1337 void set_delete_on_close_lck(struct share_mode_lock *lck, bool delete_on_close, const UNIX_USER_TOKEN *tok)
1338 {
1339 if (lck->delete_on_close != delete_on_close) {
1340 set_delete_on_close_token(lck, tok);
1341 lck->delete_on_close = delete_on_close;
1342 if (delete_on_close) {
1343 SMB_ASSERT(lck->delete_token != NULL);
1344 }
1345 lck->modified = True;
1346 }
1347 }
1348
1349 bool set_delete_on_close(files_struct *fsp, bool delete_on_close, const UNIX_USER_TOKEN *tok)
1350 {
1351 UNIX_USER_TOKEN *tok_copy = NULL;
1352 struct share_mode_lock *lck;
1353
1354 DEBUG(10,("set_delete_on_close: %s delete on close flag for "
1355 "fnum = %d, file %s\n",
1356 delete_on_close ? "Adding" : "Removing", fsp->fnum,
1357 fsp->fsp_name ));
1358
1359 lck = get_share_mode_lock(talloc_tos(), fsp->file_id, NULL, NULL,
1360 NULL);
1361 if (lck == NULL) {
1362 return False;
1363 }
1364
1365 if (fsp->conn->admin_user) {
1366 tok_copy = copy_unix_token(lck, tok);
1367 tok_copy->uid = (uid_t)0;
1368 if (tok_copy == NULL) {
1369 TALLOC_FREE(lck);
1370 return false;
1371 }
1372 tok = tok_copy;
1373 }
1374
1375 set_delete_on_close_lck(lck, delete_on_close, tok);
1376
1377 if (fsp->is_directory) {
1378 send_stat_cache_delete_message(fsp->fsp_name);
1379 }
1380
1381 TALLOC_FREE(lck);
1382 return True;
1383 }
1384
1385 bool set_sticky_write_time(struct file_id fileid, struct timespec write_time)
1386 {
1387 struct share_mode_lock *lck;
1388
1389 DEBUG(5,("set_sticky_write_time: %s id=%s\n",
1390 timestring(debug_ctx(),
1391 convert_timespec_to_time_t(write_time)),
1392 file_id_string_tos(&fileid)));
1393
1394 lck = get_share_mode_lock(NULL, fileid, NULL, NULL, NULL);
1395 if (lck == NULL) {
1396 return False;
1397 }
1398
1399 if (timespec_compare(&lck->changed_write_time, &write_time) != 0) {
1400 lck->modified = True;
1401 lck->changed_write_time = write_time;
1402 }
1403
1404 TALLOC_FREE(lck);
1405 return True;
1406 }
1407
1408 bool set_write_time(struct file_id fileid, struct timespec write_time)
1409 {
1410 struct share_mode_lock *lck;
1411
1412 DEBUG(5,("set_write_time: %s id=%s\n",
1413 timestring(debug_ctx(),
1414 convert_timespec_to_time_t(write_time)),
1415 file_id_string_tos(&fileid)));
1416
1417 lck = get_share_mode_lock(NULL, fileid, NULL, NULL, NULL);
1418 if (lck == NULL) {
1419 return False;
1420 }
1421
1422 if (timespec_compare(&lck->old_write_time, &write_time) != 0) {
1423 lck->modified = True;
1424 lck->old_write_time = write_time;
1425 }
1426
1427 TALLOC_FREE(lck);
1428 return True;
1429 }
1430
1431
1432 struct forall_state {
1433 void (*fn)(const struct share_mode_entry *entry,
1434 const char *sharepath,
1435 const char *fname,
1436 void *private_data);
1437 void *private_data;
1438 };
1439
1440 static int traverse_fn(struct db_record *rec, void *_state)
1441 {
1442 struct forall_state *state = (struct forall_state *)_state;
1443 struct locking_data *data;
1444 struct share_mode_entry *shares;
1445 const char *sharepath;
1446 const char *fname;
1447 int i;
1448
1449 /* Ensure this is a locking_key record. */
1450 if (rec->key.dsize != sizeof(struct file_id))
1451 return 0;
1452
1453 data = (struct locking_data *)rec->value.dptr;
1454 shares = (struct share_mode_entry *)(rec->value.dptr + sizeof(*data));
1455 sharepath = (const char *)rec->value.dptr + sizeof(*data) +
1456 data->u.s.num_share_mode_entries*sizeof(*shares) +
1457 data->u.s.delete_token_size;
1458 fname = (const char *)rec->value.dptr + sizeof(*data) +
1459 data->u.s.num_share_mode_entries*sizeof(*shares) +
1460 data->u.s.delete_token_size +
1461 strlen(sharepath) + 1;
1462
1463 for (i=0;i<data->u.s.num_share_mode_entries;i++) {
1464 state->fn(&shares[i], sharepath, fname,
1465 state->private_data);
1466 }
1467 return 0;
1468 }
1469
1470 /*******************************************************************
1471 Call the specified function on each entry under management by the
1472 share mode system.
1473 ********************************************************************/
1474
1475 int share_mode_forall(void (*fn)(const struct share_mode_entry *, const char *,
1476 const char *, void *),
1477 void *private_data)
1478 {
1479 struct forall_state state;
1480
1481 if (lock_db == NULL)
1482 return 0;
1483
1484 state.fn = fn;
1485 state.private_data = private_data;
1486
1487 return lock_db->traverse_read(lock_db, traverse_fn, (void *)&state);
1488 }