2 Unix SMB/CIFS implementation.
3 byte range locking code
4 Updated to handle range splits/merges.
6 Copyright (C) Andrew Tridgell 1992-2000
7 Copyright (C) Jeremy Allison 1992-2000
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 /* This module implements a tdb based byte range locking service,
24 replacing the fcntl() based byte range locking previously
25 used. This allows us to provide the same semantics as NT */
28 #include "system/filesys.h"
29 #include "lib/util/server_id.h"
30 #include "locking/proto.h"
31 #include "smbd/globals.h"
32 #include "dbwrap/dbwrap.h"
33 #include "dbwrap/dbwrap_open.h"
39 #define DBGC_CLASS DBGC_LOCKING
43 /* The open brlock.tdb database. */
45 static struct db_context
*brlock_db
;
47 struct byte_range_lock
{
48 struct files_struct
*fsp
;
49 TALLOC_CTX
*req_mem_ctx
;
50 const struct GUID
*req_guid
;
51 unsigned int num_locks
;
53 struct lock_struct
*lock_data
;
54 struct db_record
*record
;
57 /****************************************************************************
58 Debug info at level 10 for lock struct.
59 ****************************************************************************/
61 static void print_lock_struct(unsigned int i
, const struct lock_struct
*pls
)
63 struct server_id_buf tmp
;
65 DBG_DEBUG("[%u]: smblctx = %"PRIu64
", tid = %"PRIu32
", pid = %s, "
66 "start = %"PRIu64
", size = %"PRIu64
", fnum = %"PRIu64
", "
71 server_id_str_buf(pls
->context
.pid
, &tmp
),
75 lock_type_name(pls
->lock_type
),
76 lock_flav_name(pls
->lock_flav
));
79 unsigned int brl_num_locks(const struct byte_range_lock
*brl
)
81 return brl
->num_locks
;
84 struct files_struct
*brl_fsp(struct byte_range_lock
*brl
)
89 TALLOC_CTX
*brl_req_mem_ctx(const struct byte_range_lock
*brl
)
91 if (brl
->req_mem_ctx
== NULL
) {
92 return talloc_get_type_abort(brl
, struct byte_range_lock
);
95 return brl
->req_mem_ctx
;
98 const struct GUID
*brl_req_guid(const struct byte_range_lock
*brl
)
100 if (brl
->req_guid
== NULL
) {
101 static const struct GUID brl_zero_req_guid
;
102 return &brl_zero_req_guid
;
105 return brl
->req_guid
;
108 /****************************************************************************
109 See if two locking contexts are equal.
110 ****************************************************************************/
112 static bool brl_same_context(const struct lock_context
*ctx1
,
113 const struct lock_context
*ctx2
)
115 return (server_id_equal(&ctx1
->pid
, &ctx2
->pid
) &&
116 (ctx1
->smblctx
== ctx2
->smblctx
) &&
117 (ctx1
->tid
== ctx2
->tid
));
120 bool byte_range_valid(uint64_t ofs
, uint64_t len
)
122 uint64_t max_len
= UINT64_MAX
- ofs
;
123 uint64_t effective_len
;
126 * [MS-FSA] specifies this:
128 * If (((FileOffset + Length - 1) < FileOffset) && Length != 0) {
129 * return STATUS_INVALID_LOCK_RANGE
132 * We avoid integer wrapping and calculate
133 * max and effective len instead.
140 effective_len
= len
- 1;
141 if (effective_len
<= max_len
) {
148 bool byte_range_overlap(uint64_t ofs1
,
158 * This is based on [MS-FSA] 2.1.4.10
159 * Algorithm for Determining If a Range Access
160 * Conflicts with Byte-Range Locks
164 * The {0, 0} range doesn't conflict with any byte-range lock
166 if (ofs1
== 0 && len1
== 0) {
169 if (ofs2
== 0 && len2
== 0) {
174 * The caller should have checked that the ranges are
175 * valid. But currently we gracefully handle
176 * the overflow of a read/write check.
178 valid
= byte_range_valid(ofs1
, len1
);
180 last1
= ofs1
+ len1
- 1;
184 valid
= byte_range_valid(ofs2
, len2
);
186 last2
= ofs2
+ len2
- 1;
192 * If one range starts after the last
193 * byte of the other range there's
206 /****************************************************************************
207 See if lck1 and lck2 overlap.
208 ****************************************************************************/
210 static bool brl_overlap(const struct lock_struct
*lck1
,
211 const struct lock_struct
*lck2
)
213 return byte_range_overlap(lck1
->start
,
219 /****************************************************************************
220 See if lock2 can be added when lock1 is in place.
221 ****************************************************************************/
223 static bool brl_conflict(const struct lock_struct
*lck1
,
224 const struct lock_struct
*lck2
)
226 /* Read locks never conflict. */
227 if (lck1
->lock_type
== READ_LOCK
&& lck2
->lock_type
== READ_LOCK
) {
231 /* A READ lock can stack on top of a WRITE lock if they have the same
233 if (lck1
->lock_type
== WRITE_LOCK
&& lck2
->lock_type
== READ_LOCK
&&
234 brl_same_context(&lck1
->context
, &lck2
->context
) &&
235 lck1
->fnum
== lck2
->fnum
) {
239 return brl_overlap(lck1
, lck2
);
242 /****************************************************************************
243 See if lock2 can be added when lock1 is in place - when both locks are POSIX
244 flavour. POSIX locks ignore fnum - they only care about dev/ino which we
246 ****************************************************************************/
248 static bool brl_conflict_posix(const struct lock_struct
*lck1
,
249 const struct lock_struct
*lck2
)
251 #if defined(DEVELOPER)
252 SMB_ASSERT(lck1
->lock_flav
== POSIX_LOCK
);
253 SMB_ASSERT(lck2
->lock_flav
== POSIX_LOCK
);
256 /* Read locks never conflict. */
257 if (lck1
->lock_type
== READ_LOCK
&& lck2
->lock_type
== READ_LOCK
) {
261 /* Locks on the same context don't conflict. Ignore fnum. */
262 if (brl_same_context(&lck1
->context
, &lck2
->context
)) {
266 /* One is read, the other write, or the context is different,
268 return brl_overlap(lck1
, lck2
);
272 static bool brl_conflict1(const struct lock_struct
*lck1
,
273 const struct lock_struct
*lck2
)
275 if (lck1
->lock_type
== READ_LOCK
&& lck2
->lock_type
== READ_LOCK
) {
279 if (brl_same_context(&lck1
->context
, &lck2
->context
) &&
280 lck2
->lock_type
== READ_LOCK
&& lck1
->fnum
== lck2
->fnum
) {
284 if (lck2
->start
== 0 && lck2
->size
== 0 && lck1
->size
!= 0) {
288 if (lck1
->start
>= (lck2
->start
+ lck2
->size
) ||
289 lck2
->start
>= (lck1
->start
+ lck1
->size
)) {
297 /****************************************************************************
298 Check to see if this lock conflicts, but ignore our own locks on the
299 same fnum only. This is the read/write lock check code path.
300 This is never used in the POSIX lock case.
301 ****************************************************************************/
303 static bool brl_conflict_other(const struct lock_struct
*lock
,
304 const struct lock_struct
*rw_probe
)
306 if (lock
->lock_type
== READ_LOCK
&& rw_probe
->lock_type
== READ_LOCK
) {
310 if (lock
->lock_flav
== POSIX_LOCK
&&
311 rw_probe
->lock_flav
== POSIX_LOCK
) {
313 * POSIX flavour locks never conflict here - this is only called
314 * in the read/write path.
319 if (!brl_overlap(lock
, rw_probe
)) {
321 * I/O can only conflict when overlapping a lock, thus let it
327 if (!brl_same_context(&lock
->context
, &rw_probe
->context
)) {
329 * Different process, conflict
334 if (lock
->fnum
!= rw_probe
->fnum
) {
336 * Different file handle, conflict
341 if ((lock
->lock_type
== READ_LOCK
) &&
342 (rw_probe
->lock_type
== WRITE_LOCK
)) {
344 * Incoming WRITE locks conflict with existing READ locks even
345 * if the context is the same. JRA. See LOCKTEST7 in
352 * I/O request compatible with existing lock, let it pass without
359 /****************************************************************************
360 Open up the brlock.tdb database.
361 ****************************************************************************/
363 void brl_init(bool read_only
)
376 TDB_INCOMPATIBLE_HASH
|
379 db_path
= lock_path(talloc_tos(), "brlock.tdb");
380 if (db_path
== NULL
) {
381 DEBUG(0, ("out of memory!\n"));
385 brlock_db
= db_open(NULL
, db_path
,
386 SMB_OPEN_DATABASE_TDB_HASH_SIZE
, tdb_flags
,
387 read_only
?O_RDONLY
:(O_RDWR
|O_CREAT
), 0644,
388 DBWRAP_LOCK_ORDER_2
, DBWRAP_FLAG_NONE
);
390 DEBUG(0,("Failed to open byte range locking database %s\n",
392 TALLOC_FREE(db_path
);
395 TALLOC_FREE(db_path
);
398 /****************************************************************************
399 Close down the brlock.tdb database.
400 ****************************************************************************/
402 void brl_shutdown(void)
404 TALLOC_FREE(brlock_db
);
408 /****************************************************************************
409 Compare two locks for sorting.
410 ****************************************************************************/
412 static int lock_compare(const struct lock_struct
*lck1
,
413 const struct lock_struct
*lck2
)
415 if (lck1
->start
!= lck2
->start
) {
416 return (lck1
->start
- lck2
->start
);
418 if (lck2
->size
!= lck1
->size
) {
419 return ((int)lck1
->size
- (int)lck2
->size
);
425 /****************************************************************************
426 Lock a range of bytes - Windows lock semantics.
427 ****************************************************************************/
429 NTSTATUS
brl_lock_windows_default(struct byte_range_lock
*br_lck
,
430 struct lock_struct
*plock
)
433 files_struct
*fsp
= br_lck
->fsp
;
434 struct lock_struct
*locks
= br_lck
->lock_data
;
438 SMB_ASSERT(plock
->lock_type
!= UNLOCK_LOCK
);
440 valid
= byte_range_valid(plock
->start
, plock
->size
);
442 return NT_STATUS_INVALID_LOCK_RANGE
;
445 for (i
=0; i
< br_lck
->num_locks
; i
++) {
446 /* Do any Windows or POSIX locks conflict ? */
447 if (brl_conflict(&locks
[i
], plock
)) {
448 if (!serverid_exists(&locks
[i
].context
.pid
)) {
449 locks
[i
].context
.pid
.pid
= 0;
450 br_lck
->modified
= true;
453 /* Remember who blocked us. */
454 plock
->context
.smblctx
= locks
[i
].context
.smblctx
;
455 return NT_STATUS_LOCK_NOT_GRANTED
;
458 if (plock
->start
== 0 && plock
->size
== 0 &&
459 locks
[i
].size
== 0) {
465 contend_level2_oplocks_begin(fsp
, LEVEL2_CONTEND_WINDOWS_BRL
);
467 /* We can get the Windows lock, now see if it needs to
468 be mapped into a lower level POSIX one, and if so can
471 if (lp_posix_locking(fsp
->conn
->params
)) {
473 if (!set_posix_lock_windows_flavour(fsp
,
482 /* We don't know who blocked us. */
483 plock
->context
.smblctx
= 0xFFFFFFFFFFFFFFFFLL
;
485 if (errno_ret
== EACCES
|| errno_ret
== EAGAIN
) {
486 status
= NT_STATUS_LOCK_NOT_GRANTED
;
489 status
= map_nt_error_from_unix(errno
);
495 /* no conflicts - add it to the list of locks */
496 locks
= talloc_realloc(br_lck
, locks
, struct lock_struct
,
497 (br_lck
->num_locks
+ 1));
499 status
= NT_STATUS_NO_MEMORY
;
503 memcpy(&locks
[br_lck
->num_locks
], plock
, sizeof(struct lock_struct
));
504 br_lck
->num_locks
+= 1;
505 br_lck
->lock_data
= locks
;
506 br_lck
->modified
= True
;
510 contend_level2_oplocks_end(fsp
, LEVEL2_CONTEND_WINDOWS_BRL
);
514 /****************************************************************************
515 Cope with POSIX range splits and merges.
516 ****************************************************************************/
518 static unsigned int brlock_posix_split_merge(struct lock_struct
*lck_arr
, /* Output array. */
519 struct lock_struct
*ex
, /* existing lock. */
520 struct lock_struct
*plock
) /* proposed lock. */
522 bool lock_types_differ
= (ex
->lock_type
!= plock
->lock_type
);
524 /* We can't merge non-conflicting locks on different context - ignore fnum. */
526 if (!brl_same_context(&ex
->context
, &plock
->context
)) {
528 memcpy(&lck_arr
[0], ex
, sizeof(struct lock_struct
));
532 /* We now know we have the same context. */
534 /* Did we overlap ? */
536 /*********************************************
547 **********************************************/
549 if ( (ex
->start
> (plock
->start
+ plock
->size
)) ||
550 (plock
->start
> (ex
->start
+ ex
->size
))) {
552 /* No overlap with this lock - copy existing. */
554 memcpy(&lck_arr
[0], ex
, sizeof(struct lock_struct
));
558 /*********************************************
559 +---------------------------+
561 +---------------------------+
562 +---------------------------+
563 | plock | -> replace with plock.
564 +---------------------------+
569 +---------------------------+
570 | plock | -> replace with plock.
571 +---------------------------+
573 **********************************************/
575 if ( (ex
->start
>= plock
->start
) &&
576 (ex
->start
+ ex
->size
<= plock
->start
+ plock
->size
) ) {
578 /* Replace - discard existing lock. */
583 /*********************************************
593 +---------------+-------+
594 | plock | ex | - different lock types.
595 +---------------+-------+
597 +-----------------------+
598 | plock | - same lock type.
599 +-----------------------+
600 **********************************************/
602 if (plock
->start
+ plock
->size
== ex
->start
) {
604 /* If the lock types are the same, we merge, if different, we
605 add the remainder of the old lock. */
607 if (lock_types_differ
) {
609 memcpy(&lck_arr
[0], ex
, sizeof(struct lock_struct
));
612 /* Merge - adjust incoming lock as we may have more
613 * merging to come. */
614 plock
->size
+= ex
->size
;
619 /*********************************************
628 +-------+---------------+
629 | ex | plock | - different lock types
630 +-------+---------------+
633 +-----------------------+
634 | plock | - same lock type.
635 +-----------------------+
637 **********************************************/
639 if (ex
->start
+ ex
->size
== plock
->start
) {
641 /* If the lock types are the same, we merge, if different, we
642 add the existing lock. */
644 if (lock_types_differ
) {
645 memcpy(&lck_arr
[0], ex
, sizeof(struct lock_struct
));
648 /* Merge - adjust incoming lock as we may have more
649 * merging to come. */
650 plock
->start
= ex
->start
;
651 plock
->size
+= ex
->size
;
656 /*********************************************
658 +-----------------------+
660 +-----------------------+
673 +---------------+-------+
674 | plock | ex | - different lock types.
675 +---------------+-------+
677 +-----------------------+
678 | plock | - same lock type.
679 +-----------------------+
680 **********************************************/
682 if ( (ex
->start
>= plock
->start
) &&
683 (ex
->start
<= plock
->start
+ plock
->size
) &&
684 (ex
->start
+ ex
->size
> plock
->start
+ plock
->size
) ) {
686 /* If the lock types are the same, we merge, if different, we
687 add the remainder of the old lock. */
689 if (lock_types_differ
) {
690 /* Add remaining existing. */
691 memcpy(&lck_arr
[0], ex
, sizeof(struct lock_struct
));
692 /* Adjust existing start and size. */
693 lck_arr
[0].start
= plock
->start
+ plock
->size
;
694 lck_arr
[0].size
= (ex
->start
+ ex
->size
) - (plock
->start
+ plock
->size
);
697 /* Merge - adjust incoming lock as we may have more
698 * merging to come. */
699 plock
->size
+= (ex
->start
+ ex
->size
) - (plock
->start
+ plock
->size
);
704 /*********************************************
706 +-----------------------+
708 +-----------------------+
721 +-------+---------------+
722 | ex | plock | - different lock types
723 +-------+---------------+
726 +-----------------------+
727 | plock | - same lock type.
728 +-----------------------+
730 **********************************************/
732 if ( (ex
->start
< plock
->start
) &&
733 (ex
->start
+ ex
->size
>= plock
->start
) &&
734 (ex
->start
+ ex
->size
<= plock
->start
+ plock
->size
) ) {
736 /* If the lock types are the same, we merge, if different, we
737 add the truncated old lock. */
739 if (lock_types_differ
) {
740 memcpy(&lck_arr
[0], ex
, sizeof(struct lock_struct
));
741 /* Adjust existing size. */
742 lck_arr
[0].size
= plock
->start
- ex
->start
;
745 /* Merge - adjust incoming lock as we may have more
746 * merging to come. MUST ADJUST plock SIZE FIRST ! */
747 plock
->size
+= (plock
->start
- ex
->start
);
748 plock
->start
= ex
->start
;
753 /*********************************************
755 +---------------------------+
757 +---------------------------+
762 +-------+---------+---------+
763 | ex | plock | ex | - different lock types.
764 +-------+---------+---------+
766 +---------------------------+
767 | plock | - same lock type.
768 +---------------------------+
769 **********************************************/
771 if ( (ex
->start
< plock
->start
) && (ex
->start
+ ex
->size
> plock
->start
+ plock
->size
) ) {
773 if (lock_types_differ
) {
775 /* We have to split ex into two locks here. */
777 memcpy(&lck_arr
[0], ex
, sizeof(struct lock_struct
));
778 memcpy(&lck_arr
[1], ex
, sizeof(struct lock_struct
));
780 /* Adjust first existing size. */
781 lck_arr
[0].size
= plock
->start
- ex
->start
;
783 /* Adjust second existing start and size. */
784 lck_arr
[1].start
= plock
->start
+ plock
->size
;
785 lck_arr
[1].size
= (ex
->start
+ ex
->size
) - (plock
->start
+ plock
->size
);
788 /* Just eat the existing locks, merge them into plock. */
789 plock
->start
= ex
->start
;
790 plock
->size
= ex
->size
;
795 /* Never get here. */
796 smb_panic("brlock_posix_split_merge");
799 /* Keep some compilers happy. */
803 /****************************************************************************
804 Lock a range of bytes - POSIX lock semantics.
805 We must cope with range splits and merges.
806 ****************************************************************************/
808 static NTSTATUS
brl_lock_posix(struct byte_range_lock
*br_lck
,
809 struct lock_struct
*plock
)
811 unsigned int i
, count
, posix_count
;
812 struct lock_struct
*locks
= br_lck
->lock_data
;
813 struct lock_struct
*tp
;
814 bool break_oplocks
= false;
817 /* No zero-zero locks for POSIX. */
818 if (plock
->start
== 0 && plock
->size
== 0) {
819 return NT_STATUS_INVALID_PARAMETER
;
822 /* Don't allow 64-bit lock wrap. */
823 if (plock
->start
+ plock
->size
- 1 < plock
->start
) {
824 return NT_STATUS_INVALID_PARAMETER
;
827 /* The worst case scenario here is we have to split an
828 existing POSIX lock range into two, and add our lock,
829 so we need at most 2 more entries. */
831 tp
= talloc_array(br_lck
, struct lock_struct
, br_lck
->num_locks
+ 2);
833 return NT_STATUS_NO_MEMORY
;
836 count
= posix_count
= 0;
838 for (i
=0; i
< br_lck
->num_locks
; i
++) {
839 struct lock_struct
*curr_lock
= &locks
[i
];
841 if (curr_lock
->lock_flav
== WINDOWS_LOCK
) {
842 /* Do any Windows flavour locks conflict ? */
843 if (brl_conflict(curr_lock
, plock
)) {
844 if (!serverid_exists(&curr_lock
->context
.pid
)) {
845 curr_lock
->context
.pid
.pid
= 0;
846 br_lck
->modified
= true;
849 /* No games with error messages. */
851 /* Remember who blocked us. */
852 plock
->context
.smblctx
= curr_lock
->context
.smblctx
;
853 return NT_STATUS_LOCK_NOT_GRANTED
;
855 /* Just copy the Windows lock into the new array. */
856 memcpy(&tp
[count
], curr_lock
, sizeof(struct lock_struct
));
859 unsigned int tmp_count
= 0;
861 /* POSIX conflict semantics are different. */
862 if (brl_conflict_posix(curr_lock
, plock
)) {
863 if (!serverid_exists(&curr_lock
->context
.pid
)) {
864 curr_lock
->context
.pid
.pid
= 0;
865 br_lck
->modified
= true;
868 /* Can't block ourselves with POSIX locks. */
869 /* No games with error messages. */
871 /* Remember who blocked us. */
872 plock
->context
.smblctx
= curr_lock
->context
.smblctx
;
873 return NT_STATUS_LOCK_NOT_GRANTED
;
876 /* Work out overlaps. */
877 tmp_count
+= brlock_posix_split_merge(&tp
[count
], curr_lock
, plock
);
878 posix_count
+= tmp_count
;
884 * Break oplocks while we hold a brl. Since lock() and unlock() calls
885 * are not symetric with POSIX semantics, we cannot guarantee our
886 * contend_level2_oplocks_begin/end calls will be acquired and
887 * released one-for-one as with Windows semantics. Therefore we only
888 * call contend_level2_oplocks_begin if this is the first POSIX brl on
891 break_oplocks
= (posix_count
== 0);
893 contend_level2_oplocks_begin(br_lck
->fsp
,
894 LEVEL2_CONTEND_POSIX_BRL
);
897 /* Try and add the lock in order, sorted by lock start. */
898 for (i
=0; i
< count
; i
++) {
899 struct lock_struct
*curr_lock
= &tp
[i
];
901 if (curr_lock
->start
<= plock
->start
) {
907 memmove(&tp
[i
+1], &tp
[i
],
908 (count
- i
)*sizeof(struct lock_struct
));
910 memcpy(&tp
[i
], plock
, sizeof(struct lock_struct
));
913 /* We can get the POSIX lock, now see if it needs to
914 be mapped into a lower level POSIX one, and if so can
917 if (lp_posix_locking(br_lck
->fsp
->conn
->params
)) {
920 /* The lower layer just needs to attempt to
921 get the system POSIX lock. We've weeded out
922 any conflicts above. */
924 if (!set_posix_lock_posix_flavour(br_lck
->fsp
,
931 /* We don't know who blocked us. */
932 plock
->context
.smblctx
= 0xFFFFFFFFFFFFFFFFLL
;
934 if (errno_ret
== EACCES
|| errno_ret
== EAGAIN
) {
936 status
= NT_STATUS_LOCK_NOT_GRANTED
;
940 status
= map_nt_error_from_unix(errno
);
946 /* If we didn't use all the allocated size,
947 * Realloc so we don't leak entries per lock call. */
948 if (count
< br_lck
->num_locks
+ 2) {
949 tp
= talloc_realloc(br_lck
, tp
, struct lock_struct
, count
);
951 status
= NT_STATUS_NO_MEMORY
;
956 br_lck
->num_locks
= count
;
957 TALLOC_FREE(br_lck
->lock_data
);
958 br_lck
->lock_data
= tp
;
960 br_lck
->modified
= True
;
962 /* A successful downgrade from write to read lock can trigger a lock
963 re-evalutation where waiting readers can now proceed. */
968 contend_level2_oplocks_end(br_lck
->fsp
,
969 LEVEL2_CONTEND_POSIX_BRL
);
974 NTSTATUS
smb_vfs_call_brl_lock_windows(struct vfs_handle_struct
*handle
,
975 struct byte_range_lock
*br_lck
,
976 struct lock_struct
*plock
)
978 VFS_FIND(brl_lock_windows
);
979 return handle
->fns
->brl_lock_windows_fn(handle
, br_lck
, plock
);
982 /****************************************************************************
983 Lock a range of bytes.
984 ****************************************************************************/
987 struct byte_range_lock
*br_lck
,
989 struct server_id pid
,
992 enum brl_type lock_type
,
993 enum brl_flavour lock_flav
,
994 struct server_id
*blocker_pid
,
998 struct lock_struct lock
;
1003 if (start
== 0 && size
== 0) {
1004 DEBUG(0,("client sent 0/0 lock - please report this\n"));
1008 lock
= (struct lock_struct
) {
1009 .context
.smblctx
= smblctx
,
1011 .context
.tid
= br_lck
->fsp
->conn
->cnum
,
1014 .fnum
= br_lck
->fsp
->fnum
,
1015 .lock_type
= lock_type
,
1016 .lock_flav
= lock_flav
1019 if (lock_flav
== WINDOWS_LOCK
) {
1020 ret
= SMB_VFS_BRL_LOCK_WINDOWS(
1021 br_lck
->fsp
->conn
, br_lck
, &lock
);
1023 ret
= brl_lock_posix(br_lck
, &lock
);
1027 /* sort the lock list */
1028 TYPESAFE_QSORT(br_lck
->lock_data
, (size_t)br_lck
->num_locks
, lock_compare
);
1030 /* If we're returning an error, return who blocked us. */
1031 if (!NT_STATUS_IS_OK(ret
) && psmblctx
) {
1032 *blocker_pid
= lock
.context
.pid
;
1033 *psmblctx
= lock
.context
.smblctx
;
1038 /****************************************************************************
1039 Unlock a range of bytes - Windows semantics.
1040 ****************************************************************************/
1042 bool brl_unlock_windows_default(struct byte_range_lock
*br_lck
,
1043 const struct lock_struct
*plock
)
1046 struct lock_struct
*locks
= br_lck
->lock_data
;
1047 enum brl_type deleted_lock_type
= READ_LOCK
; /* shut the compiler up.... */
1049 SMB_ASSERT(plock
->lock_type
== UNLOCK_LOCK
);
1052 /* Delete write locks by preference... The lock list
1053 is sorted in the zero zero case. */
1055 for (i
= 0; i
< br_lck
->num_locks
; i
++) {
1056 struct lock_struct
*lock
= &locks
[i
];
1058 if (lock
->lock_type
== WRITE_LOCK
&&
1059 brl_same_context(&lock
->context
, &plock
->context
) &&
1060 lock
->fnum
== plock
->fnum
&&
1061 lock
->lock_flav
== WINDOWS_LOCK
&&
1062 lock
->start
== plock
->start
&&
1063 lock
->size
== plock
->size
) {
1065 /* found it - delete it */
1066 deleted_lock_type
= lock
->lock_type
;
1071 if (i
!= br_lck
->num_locks
) {
1072 /* We found it - don't search again. */
1073 goto unlock_continue
;
1077 for (i
= 0; i
< br_lck
->num_locks
; i
++) {
1078 struct lock_struct
*lock
= &locks
[i
];
1080 /* Only remove our own locks that match in start, size, and flavour. */
1081 if (brl_same_context(&lock
->context
, &plock
->context
) &&
1082 lock
->fnum
== plock
->fnum
&&
1083 lock
->lock_flav
== WINDOWS_LOCK
&&
1084 lock
->start
== plock
->start
&&
1085 lock
->size
== plock
->size
) {
1086 deleted_lock_type
= lock
->lock_type
;
1091 if (i
== br_lck
->num_locks
) {
1092 /* we didn't find it */
1100 ARRAY_DEL_ELEMENT(locks
, i
, br_lck
->num_locks
);
1101 br_lck
->num_locks
-= 1;
1102 br_lck
->modified
= True
;
1104 /* Unlock the underlying POSIX regions. */
1105 if(lp_posix_locking(br_lck
->fsp
->conn
->params
)) {
1106 release_posix_lock_windows_flavour(br_lck
->fsp
,
1115 contend_level2_oplocks_end(br_lck
->fsp
, LEVEL2_CONTEND_WINDOWS_BRL
);
1119 /****************************************************************************
1120 Unlock a range of bytes - POSIX semantics.
1121 ****************************************************************************/
1123 static bool brl_unlock_posix(struct byte_range_lock
*br_lck
,
1124 struct lock_struct
*plock
)
1126 unsigned int i
, count
;
1127 struct lock_struct
*tp
;
1128 struct lock_struct
*locks
= br_lck
->lock_data
;
1129 bool overlap_found
= False
;
1131 /* No zero-zero locks for POSIX. */
1132 if (plock
->start
== 0 && plock
->size
== 0) {
1136 /* Don't allow 64-bit lock wrap. */
1137 if (plock
->start
+ plock
->size
< plock
->start
||
1138 plock
->start
+ plock
->size
< plock
->size
) {
1139 DEBUG(10,("brl_unlock_posix: lock wrap\n"));
1143 /* The worst case scenario here is we have to split an
1144 existing POSIX lock range into two, so we need at most
1147 tp
= talloc_array(br_lck
, struct lock_struct
, br_lck
->num_locks
+ 1);
1149 DEBUG(10,("brl_unlock_posix: malloc fail\n"));
1154 for (i
= 0; i
< br_lck
->num_locks
; i
++) {
1155 struct lock_struct
*lock
= &locks
[i
];
1156 unsigned int tmp_count
;
1158 /* Only remove our own locks - ignore fnum. */
1159 if (!brl_same_context(&lock
->context
, &plock
->context
)) {
1160 memcpy(&tp
[count
], lock
, sizeof(struct lock_struct
));
1165 if (lock
->lock_flav
== WINDOWS_LOCK
) {
1166 /* Do any Windows flavour locks conflict ? */
1167 if (brl_conflict(lock
, plock
)) {
1171 /* Just copy the Windows lock into the new array. */
1172 memcpy(&tp
[count
], lock
, sizeof(struct lock_struct
));
1177 /* Work out overlaps. */
1178 tmp_count
= brlock_posix_split_merge(&tp
[count
], lock
, plock
);
1180 if (tmp_count
== 0) {
1181 /* plock overlapped the existing lock completely,
1182 or replaced it. Don't copy the existing lock. */
1183 overlap_found
= true;
1184 } else if (tmp_count
== 1) {
1185 /* Either no overlap, (simple copy of existing lock) or
1186 * an overlap of an existing lock. */
1187 /* If the lock changed size, we had an overlap. */
1188 if (tp
[count
].size
!= lock
->size
) {
1189 overlap_found
= true;
1192 } else if (tmp_count
== 2) {
1193 /* We split a lock range in two. */
1194 overlap_found
= true;
1197 /* Optimisation... */
1198 /* We know we're finished here as we can't overlap any
1199 more POSIX locks. Copy the rest of the lock array. */
1201 if (i
< br_lck
->num_locks
- 1) {
1202 memcpy(&tp
[count
], &locks
[i
+1],
1203 sizeof(*locks
)*((br_lck
->num_locks
-1) - i
));
1204 count
+= ((br_lck
->num_locks
-1) - i
);
1211 if (!overlap_found
) {
1212 /* Just ignore - no change. */
1214 DEBUG(10,("brl_unlock_posix: No overlap - unlocked.\n"));
1218 /* Unlock any POSIX regions. */
1219 if(lp_posix_locking(br_lck
->fsp
->conn
->params
)) {
1220 release_posix_lock_posix_flavour(br_lck
->fsp
,
1228 /* Realloc so we don't leak entries per unlock call. */
1230 tp
= talloc_realloc(br_lck
, tp
, struct lock_struct
, count
);
1232 DEBUG(10,("brl_unlock_posix: realloc fail\n"));
1236 /* We deleted the last lock. */
1241 contend_level2_oplocks_end(br_lck
->fsp
,
1242 LEVEL2_CONTEND_POSIX_BRL
);
1244 br_lck
->num_locks
= count
;
1245 TALLOC_FREE(br_lck
->lock_data
);
1247 br_lck
->lock_data
= tp
;
1248 br_lck
->modified
= True
;
1253 bool smb_vfs_call_brl_unlock_windows(struct vfs_handle_struct
*handle
,
1254 struct byte_range_lock
*br_lck
,
1255 const struct lock_struct
*plock
)
1257 VFS_FIND(brl_unlock_windows
);
1258 return handle
->fns
->brl_unlock_windows_fn(handle
, br_lck
, plock
);
1261 /****************************************************************************
1262 Unlock a range of bytes.
1263 ****************************************************************************/
1265 bool brl_unlock(struct byte_range_lock
*br_lck
,
1267 struct server_id pid
,
1270 enum brl_flavour lock_flav
)
1272 struct lock_struct lock
;
1274 lock
.context
.smblctx
= smblctx
;
1275 lock
.context
.pid
= pid
;
1276 lock
.context
.tid
= br_lck
->fsp
->conn
->cnum
;
1279 lock
.fnum
= br_lck
->fsp
->fnum
;
1280 lock
.lock_type
= UNLOCK_LOCK
;
1281 lock
.lock_flav
= lock_flav
;
1283 if (lock_flav
== WINDOWS_LOCK
) {
1284 return SMB_VFS_BRL_UNLOCK_WINDOWS(
1285 br_lck
->fsp
->conn
, br_lck
, &lock
);
1287 return brl_unlock_posix(br_lck
, &lock
);
1291 /****************************************************************************
1292 Test if we could add a lock if we wanted to.
1293 Returns True if the region required is currently unlocked, False if locked.
1294 ****************************************************************************/
1296 bool brl_locktest(struct byte_range_lock
*br_lck
,
1297 const struct lock_struct
*rw_probe
)
1301 struct lock_struct
*locks
= br_lck
->lock_data
;
1302 files_struct
*fsp
= br_lck
->fsp
;
1304 /* Make sure existing locks don't conflict */
1305 for (i
=0; i
< br_lck
->num_locks
; i
++) {
1307 * Our own locks don't conflict.
1309 if (brl_conflict_other(&locks
[i
], rw_probe
)) {
1310 if (br_lck
->record
== NULL
) {
1315 if (!serverid_exists(&locks
[i
].context
.pid
)) {
1316 locks
[i
].context
.pid
.pid
= 0;
1317 br_lck
->modified
= true;
1326 * There is no lock held by an SMB daemon, check to
1327 * see if there is a POSIX lock from a UNIX or NFS process.
1328 * This only conflicts with Windows locks, not POSIX locks.
1331 if(lp_posix_locking(fsp
->conn
->params
) &&
1332 (rw_probe
->lock_flav
== WINDOWS_LOCK
)) {
1334 * Make copies -- is_posix_locked might modify the values
1337 br_off start
= rw_probe
->start
;
1338 br_off size
= rw_probe
->size
;
1339 enum brl_type lock_type
= rw_probe
->lock_type
;
1341 ret
= is_posix_locked(fsp
, &start
, &size
, &lock_type
, WINDOWS_LOCK
);
1343 DEBUG(10, ("brl_locktest: posix start=%ju len=%ju %s for %s "
1344 "file %s\n", (uintmax_t)start
, (uintmax_t)size
,
1345 ret
? "locked" : "unlocked",
1346 fsp_fnum_dbg(fsp
), fsp_str_dbg(fsp
)));
1348 /* We need to return the inverse of is_posix_locked. */
1352 /* no conflicts - we could have added it */
1356 /****************************************************************************
1357 Query for existing locks.
1358 ****************************************************************************/
1360 NTSTATUS
brl_lockquery(struct byte_range_lock
*br_lck
,
1362 struct server_id pid
,
1365 enum brl_type
*plock_type
,
1366 enum brl_flavour lock_flav
)
1369 struct lock_struct lock
;
1370 const struct lock_struct
*locks
= br_lck
->lock_data
;
1371 files_struct
*fsp
= br_lck
->fsp
;
1373 lock
.context
.smblctx
= *psmblctx
;
1374 lock
.context
.pid
= pid
;
1375 lock
.context
.tid
= br_lck
->fsp
->conn
->cnum
;
1376 lock
.start
= *pstart
;
1378 lock
.fnum
= fsp
->fnum
;
1379 lock
.lock_type
= *plock_type
;
1380 lock
.lock_flav
= lock_flav
;
1382 /* Make sure existing locks don't conflict */
1383 for (i
=0; i
< br_lck
->num_locks
; i
++) {
1384 const struct lock_struct
*exlock
= &locks
[i
];
1385 bool conflict
= False
;
1387 if (exlock
->lock_flav
== WINDOWS_LOCK
) {
1388 conflict
= brl_conflict(exlock
, &lock
);
1390 conflict
= brl_conflict_posix(exlock
, &lock
);
1394 *psmblctx
= exlock
->context
.smblctx
;
1395 *pstart
= exlock
->start
;
1396 *psize
= exlock
->size
;
1397 *plock_type
= exlock
->lock_type
;
1398 return NT_STATUS_LOCK_NOT_GRANTED
;
1403 * There is no lock held by an SMB daemon, check to
1404 * see if there is a POSIX lock from a UNIX or NFS process.
1407 if(lp_posix_locking(fsp
->conn
->params
)) {
1408 bool ret
= is_posix_locked(fsp
, pstart
, psize
, plock_type
, POSIX_LOCK
);
1410 DEBUG(10, ("brl_lockquery: posix start=%ju len=%ju %s for %s "
1411 "file %s\n", (uintmax_t)*pstart
,
1412 (uintmax_t)*psize
, ret
? "locked" : "unlocked",
1413 fsp_fnum_dbg(fsp
), fsp_str_dbg(fsp
)));
1416 /* Hmmm. No clue what to set smblctx to - use -1. */
1417 *psmblctx
= 0xFFFFFFFFFFFFFFFFLL
;
1418 return NT_STATUS_LOCK_NOT_GRANTED
;
1422 return NT_STATUS_OK
;
1426 /****************************************************************************
1427 Remove any locks associated with a open file.
1428 We return True if this process owns any other Windows locks on this
1429 fd and so we should not immediately close the fd.
1430 ****************************************************************************/
1432 void brl_close_fnum(struct byte_range_lock
*br_lck
)
1434 files_struct
*fsp
= br_lck
->fsp
;
1435 uint32_t tid
= fsp
->conn
->cnum
;
1436 uint64_t fnum
= fsp
->fnum
;
1438 struct lock_struct
*locks
= br_lck
->lock_data
;
1439 struct server_id pid
= messaging_server_id(fsp
->conn
->sconn
->msg_ctx
);
1440 struct lock_struct
*locks_copy
;
1441 unsigned int num_locks_copy
;
1443 /* Copy the current lock array. */
1444 if (br_lck
->num_locks
) {
1445 locks_copy
= (struct lock_struct
*)talloc_memdup(br_lck
, locks
, br_lck
->num_locks
* sizeof(struct lock_struct
));
1447 smb_panic("brl_close_fnum: talloc failed");
1453 num_locks_copy
= br_lck
->num_locks
;
1455 for (i
=0; i
< num_locks_copy
; i
++) {
1456 struct lock_struct
*lock
= &locks_copy
[i
];
1458 if (lock
->context
.tid
== tid
&&
1459 server_id_equal(&lock
->context
.pid
, &pid
) &&
1460 (lock
->fnum
== fnum
)) {
1463 lock
->context
.smblctx
,
1472 bool brl_mark_disconnected(struct files_struct
*fsp
)
1474 uint32_t tid
= fsp
->conn
->cnum
;
1476 uint64_t fnum
= fsp
->fnum
;
1478 struct server_id self
= messaging_server_id(fsp
->conn
->sconn
->msg_ctx
);
1479 struct byte_range_lock
*br_lck
= NULL
;
1481 if (fsp
->op
== NULL
) {
1485 smblctx
= fsp
->op
->global
->open_persistent_id
;
1487 if (!fsp
->op
->global
->durable
) {
1491 if (fsp
->current_lock_count
== 0) {
1495 br_lck
= brl_get_locks(talloc_tos(), fsp
);
1496 if (br_lck
== NULL
) {
1500 for (i
=0; i
< br_lck
->num_locks
; i
++) {
1501 struct lock_struct
*lock
= &br_lck
->lock_data
[i
];
1504 * as this is a durable handle, we only expect locks
1505 * of the current file handle!
1508 if (lock
->context
.smblctx
!= smblctx
) {
1509 TALLOC_FREE(br_lck
);
1513 if (lock
->context
.tid
!= tid
) {
1514 TALLOC_FREE(br_lck
);
1518 if (!server_id_equal(&lock
->context
.pid
, &self
)) {
1519 TALLOC_FREE(br_lck
);
1523 if (lock
->fnum
!= fnum
) {
1524 TALLOC_FREE(br_lck
);
1528 server_id_set_disconnected(&lock
->context
.pid
);
1529 lock
->context
.tid
= TID_FIELD_INVALID
;
1530 lock
->fnum
= FNUM_FIELD_INVALID
;
1533 br_lck
->modified
= true;
1534 TALLOC_FREE(br_lck
);
1538 bool brl_reconnect_disconnected(struct files_struct
*fsp
)
1540 uint32_t tid
= fsp
->conn
->cnum
;
1542 uint64_t fnum
= fsp
->fnum
;
1544 struct server_id self
= messaging_server_id(fsp
->conn
->sconn
->msg_ctx
);
1545 struct byte_range_lock
*br_lck
= NULL
;
1547 if (fsp
->op
== NULL
) {
1551 smblctx
= fsp
->op
->global
->open_persistent_id
;
1553 if (!fsp
->op
->global
->durable
) {
1558 * When reconnecting, we do not want to validate the brlock entries
1559 * and thereby remove our own (disconnected) entries but reactivate
1563 br_lck
= brl_get_locks(talloc_tos(), fsp
);
1564 if (br_lck
== NULL
) {
1568 if (br_lck
->num_locks
== 0) {
1569 TALLOC_FREE(br_lck
);
1573 for (i
=0; i
< br_lck
->num_locks
; i
++) {
1574 struct lock_struct
*lock
= &br_lck
->lock_data
[i
];
1577 * as this is a durable handle we only expect locks
1578 * of the current file handle!
1581 if (lock
->context
.smblctx
!= smblctx
) {
1582 TALLOC_FREE(br_lck
);
1586 if (lock
->context
.tid
!= TID_FIELD_INVALID
) {
1587 TALLOC_FREE(br_lck
);
1591 if (!server_id_is_disconnected(&lock
->context
.pid
)) {
1592 TALLOC_FREE(br_lck
);
1596 if (lock
->fnum
!= FNUM_FIELD_INVALID
) {
1597 TALLOC_FREE(br_lck
);
1601 lock
->context
.pid
= self
;
1602 lock
->context
.tid
= tid
;
1606 fsp
->current_lock_count
= br_lck
->num_locks
;
1607 br_lck
->modified
= true;
1608 TALLOC_FREE(br_lck
);
1612 struct brl_forall_cb
{
1613 void (*fn
)(struct file_id id
, struct server_id pid
,
1614 enum brl_type lock_type
,
1615 enum brl_flavour lock_flav
,
1616 br_off start
, br_off size
,
1617 void *private_data
);
1621 /****************************************************************************
1622 Traverse the whole database with this function, calling traverse_callback
1624 ****************************************************************************/
1626 static int brl_traverse_fn(struct db_record
*rec
, void *state
)
1628 struct brl_forall_cb
*cb
= (struct brl_forall_cb
*)state
;
1629 struct lock_struct
*locks
;
1630 struct file_id
*key
;
1632 unsigned int num_locks
= 0;
1636 dbkey
= dbwrap_record_get_key(rec
);
1637 value
= dbwrap_record_get_value(rec
);
1639 /* In a traverse function we must make a copy of
1640 dbuf before modifying it. */
1642 locks
= (struct lock_struct
*)talloc_memdup(
1643 talloc_tos(), value
.dptr
, value
.dsize
);
1645 return -1; /* Terminate traversal. */
1648 key
= (struct file_id
*)dbkey
.dptr
;
1649 num_locks
= value
.dsize
/sizeof(*locks
);
1652 for ( i
=0; i
<num_locks
; i
++) {
1654 locks
[i
].context
.pid
,
1667 /*******************************************************************
1668 Call the specified function on each lock in the database.
1669 ********************************************************************/
1671 int brl_forall(void (*fn
)(struct file_id id
, struct server_id pid
,
1672 enum brl_type lock_type
,
1673 enum brl_flavour lock_flav
,
1674 br_off start
, br_off size
,
1675 void *private_data
),
1678 struct brl_forall_cb cb
;
1686 cb
.private_data
= private_data
;
1687 status
= dbwrap_traverse(brlock_db
, brl_traverse_fn
, &cb
, &count
);
1689 if (!NT_STATUS_IS_OK(status
)) {
1696 /*******************************************************************
1697 Store a potentially modified set of byte range lock data back into
1700 ********************************************************************/
1702 static void byte_range_lock_flush(struct byte_range_lock
*br_lck
)
1705 struct lock_struct
*locks
= br_lck
->lock_data
;
1707 if (!br_lck
->modified
) {
1708 DEBUG(10, ("br_lck not modified\n"));
1714 while (i
< br_lck
->num_locks
) {
1715 if (locks
[i
].context
.pid
.pid
== 0) {
1717 * Autocleanup, the process conflicted and does not
1720 locks
[i
] = locks
[br_lck
->num_locks
-1];
1721 br_lck
->num_locks
-= 1;
1727 if (br_lck
->num_locks
== 0) {
1728 /* No locks - delete this entry. */
1729 NTSTATUS status
= dbwrap_record_delete(br_lck
->record
);
1730 if (!NT_STATUS_IS_OK(status
)) {
1731 DEBUG(0, ("delete_rec returned %s\n",
1732 nt_errstr(status
)));
1733 smb_panic("Could not delete byte range lock entry");
1737 .dsize
= br_lck
->num_locks
* sizeof(struct lock_struct
),
1738 .dptr
= (uint8_t *)br_lck
->lock_data
,
1742 status
= dbwrap_record_store(br_lck
->record
, data
, TDB_REPLACE
);
1743 if (!NT_STATUS_IS_OK(status
)) {
1744 DEBUG(0, ("store returned %s\n", nt_errstr(status
)));
1745 smb_panic("Could not store byte range mode entry");
1749 DEBUG(10, ("seqnum=%d\n", dbwrap_get_seqnum(brlock_db
)));
1752 br_lck
->modified
= false;
1753 TALLOC_FREE(br_lck
->record
);
1756 static int byte_range_lock_destructor(struct byte_range_lock
*br_lck
)
1758 byte_range_lock_flush(br_lck
);
1762 static bool brl_parse_data(struct byte_range_lock
*br_lck
, TDB_DATA data
)
1766 if (data
.dsize
== 0) {
1769 if (data
.dsize
% sizeof(struct lock_struct
) != 0) {
1770 DEBUG(1, ("Invalid data size: %u\n", (unsigned)data
.dsize
));
1774 br_lck
->num_locks
= data
.dsize
/ sizeof(struct lock_struct
);
1775 data_len
= br_lck
->num_locks
* sizeof(struct lock_struct
);
1777 br_lck
->lock_data
= talloc_memdup(br_lck
, data
.dptr
, data_len
);
1778 if (br_lck
->lock_data
== NULL
) {
1779 DEBUG(1, ("talloc_memdup failed\n"));
1785 /*******************************************************************
1786 Fetch a set of byte range lock data from the database.
1787 Leave the record locked.
1788 TALLOC_FREE(brl) will release the lock in the destructor.
1789 ********************************************************************/
1791 struct byte_range_lock
*brl_get_locks(TALLOC_CTX
*mem_ctx
, files_struct
*fsp
)
1794 struct byte_range_lock
*br_lck
;
1796 br_lck
= talloc_zero(mem_ctx
, struct byte_range_lock
);
1797 if (br_lck
== NULL
) {
1803 key
.dptr
= (uint8_t *)&fsp
->file_id
;
1804 key
.dsize
= sizeof(struct file_id
);
1806 br_lck
->record
= dbwrap_fetch_locked(brlock_db
, br_lck
, key
);
1808 if (br_lck
->record
== NULL
) {
1809 DEBUG(3, ("Could not lock byte range lock entry\n"));
1810 TALLOC_FREE(br_lck
);
1814 data
= dbwrap_record_get_value(br_lck
->record
);
1816 if (!brl_parse_data(br_lck
, data
)) {
1817 TALLOC_FREE(br_lck
);
1821 talloc_set_destructor(br_lck
, byte_range_lock_destructor
);
1823 if (DEBUGLEVEL
>= 10) {
1825 struct file_id_buf buf
;
1826 struct lock_struct
*locks
= br_lck
->lock_data
;
1827 DBG_DEBUG("%u current locks on file_id %s\n",
1829 file_id_str_buf(fsp
->file_id
, &buf
));
1830 for( i
= 0; i
< br_lck
->num_locks
; i
++) {
1831 print_lock_struct(i
, &locks
[i
]);
1838 struct byte_range_lock
*brl_get_locks_for_locking(TALLOC_CTX
*mem_ctx
,
1840 TALLOC_CTX
*req_mem_ctx
,
1841 const struct GUID
*req_guid
)
1843 struct byte_range_lock
*br_lck
= NULL
;
1845 br_lck
= brl_get_locks(mem_ctx
, fsp
);
1846 if (br_lck
== NULL
) {
1849 SMB_ASSERT(req_mem_ctx
!= NULL
);
1850 br_lck
->req_mem_ctx
= req_mem_ctx
;
1851 SMB_ASSERT(req_guid
!= NULL
);
1852 br_lck
->req_guid
= req_guid
;
1857 struct brl_get_locks_readonly_state
{
1858 TALLOC_CTX
*mem_ctx
;
1859 struct byte_range_lock
**br_lock
;
1862 static void brl_get_locks_readonly_parser(TDB_DATA key
, TDB_DATA data
,
1865 struct brl_get_locks_readonly_state
*state
=
1866 (struct brl_get_locks_readonly_state
*)private_data
;
1867 struct byte_range_lock
*br_lck
;
1869 br_lck
= talloc_pooled_object(
1870 state
->mem_ctx
, struct byte_range_lock
, 1, data
.dsize
);
1871 if (br_lck
== NULL
) {
1872 *state
->br_lock
= NULL
;
1875 *br_lck
= (struct byte_range_lock
) { 0 };
1876 if (!brl_parse_data(br_lck
, data
)) {
1877 *state
->br_lock
= NULL
;
1880 *state
->br_lock
= br_lck
;
1883 struct byte_range_lock
*brl_get_locks_readonly(files_struct
*fsp
)
1885 struct byte_range_lock
*br_lock
= NULL
;
1886 struct brl_get_locks_readonly_state state
;
1889 DEBUG(10, ("seqnum=%d, fsp->brlock_seqnum=%d\n",
1890 dbwrap_get_seqnum(brlock_db
), fsp
->brlock_seqnum
));
1892 if ((fsp
->brlock_rec
!= NULL
)
1893 && (dbwrap_get_seqnum(brlock_db
) == fsp
->brlock_seqnum
)) {
1895 * We have cached the brlock_rec and the database did not
1898 return fsp
->brlock_rec
;
1902 * Parse the record fresh from the database
1905 state
.mem_ctx
= fsp
;
1906 state
.br_lock
= &br_lock
;
1908 status
= dbwrap_parse_record(
1910 make_tdb_data((uint8_t *)&fsp
->file_id
,
1911 sizeof(fsp
->file_id
)),
1912 brl_get_locks_readonly_parser
, &state
);
1914 if (NT_STATUS_EQUAL(status
,NT_STATUS_NOT_FOUND
)) {
1916 * No locks on this file. Return an empty br_lock.
1918 br_lock
= talloc_zero(fsp
, struct byte_range_lock
);
1919 if (br_lock
== NULL
) {
1923 } else if (!NT_STATUS_IS_OK(status
)) {
1924 DEBUG(3, ("Could not parse byte range lock record: "
1925 "%s\n", nt_errstr(status
)));
1928 if (br_lock
== NULL
) {
1933 br_lock
->modified
= false;
1934 br_lock
->record
= NULL
;
1937 * Cache the brlock struct, invalidated when the dbwrap_seqnum
1938 * changes. See beginning of this routine.
1940 TALLOC_FREE(fsp
->brlock_rec
);
1941 fsp
->brlock_rec
= br_lock
;
1942 fsp
->brlock_seqnum
= dbwrap_get_seqnum(brlock_db
);
1947 bool brl_cleanup_disconnected(struct file_id fid
, uint64_t open_persistent_id
)
1950 TALLOC_CTX
*frame
= talloc_stackframe();
1952 struct db_record
*rec
;
1953 struct lock_struct
*lock
;
1955 struct file_id_buf buf
;
1958 key
= make_tdb_data((void*)&fid
, sizeof(fid
));
1960 rec
= dbwrap_fetch_locked(brlock_db
, frame
, key
);
1962 DBG_INFO("failed to fetch record for file %s\n",
1963 file_id_str_buf(fid
, &buf
));
1967 val
= dbwrap_record_get_value(rec
);
1968 lock
= (struct lock_struct
*)val
.dptr
;
1969 num
= val
.dsize
/ sizeof(struct lock_struct
);
1971 DBG_DEBUG("no byte range locks for file %s\n",
1972 file_id_str_buf(fid
, &buf
));
1977 for (n
=0; n
<num
; n
++) {
1978 struct lock_context
*ctx
= &lock
[n
].context
;
1980 if (!server_id_is_disconnected(&ctx
->pid
)) {
1981 struct server_id_buf tmp
;
1982 DBG_INFO("byte range lock "
1983 "%s used by server %s, do not cleanup\n",
1984 file_id_str_buf(fid
, &buf
),
1985 server_id_str_buf(ctx
->pid
, &tmp
));
1989 if (ctx
->smblctx
!= open_persistent_id
) {
1990 DBG_INFO("byte range lock %s expected smblctx %"PRIu64
" "
1991 "but found %"PRIu64
", do not cleanup\n",
1992 file_id_str_buf(fid
, &buf
),
1999 status
= dbwrap_record_delete(rec
);
2000 if (!NT_STATUS_IS_OK(status
)) {
2001 DBG_INFO("failed to delete record "
2002 "for file %s from %s, open %"PRIu64
": %s\n",
2003 file_id_str_buf(fid
, &buf
),
2004 dbwrap_name(brlock_db
),
2010 DBG_DEBUG("file %s cleaned up %u entries from open %"PRIu64
"\n",
2011 file_id_str_buf(fid
, &buf
),
2013 open_persistent_id
);