2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 1992-2000
5 Copyright (C) Jeremy Allison 1992-2006
6 Copyright (C) Volker Lendecke 2005
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.
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.
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/>.
23 12 aug 96: Erik.Devriendt@te6.siemens.be
24 added support for shared memory implementation of share mode locking
26 May 1997. Jeremy Allison (jallison@whistle.com). Modified share mode
27 locking to deal with multiple share modes per open file.
29 September 1997. Jeremy Allison (jallison@whistle.com). Added oplock
32 rewritten completely to use new tdb code. Tridge, Dec '99
34 Added POSIX locking support. Jeremy Allison (jeremy@valinux.com), Apr. 2000.
35 Added Unix Extensions POSIX locking support. Jeremy Allison Mar 2006.
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"
48 #include "../librpc/gen_ndr/ndr_open_files.h"
49 #include "source3/lib/dbwrap/dbwrap_watch.h"
52 #define DBGC_CLASS DBGC_LOCKING
54 #define NO_LOCKING_COUNT (-1)
56 /* the locking database handle */
57 static struct db_context
*lock_db
;
59 static bool locking_init_internal(bool read_only
)
66 lock_db
= db_open(NULL
, lock_path("locking.tdb"),
67 lp_open_files_db_hash_size(),
68 TDB_DEFAULT
|TDB_VOLATILE
|TDB_CLEAR_IF_FIRST
|TDB_INCOMPATIBLE_HASH
,
69 read_only
?O_RDONLY
:O_RDWR
|O_CREAT
, 0644,
73 DEBUG(0,("ERROR: Failed to initialise locking database\n"));
77 if (!posix_locking_init(read_only
))
80 dbwrap_watch_db(lock_db
, server_messaging_context());
85 bool locking_init(void)
87 return locking_init_internal(false);
90 bool locking_init_readonly(void)
92 return locking_init_internal(true);
95 /*******************************************************************
96 Deinitialize the share_mode management.
97 ******************************************************************/
99 bool locking_end(void)
102 TALLOC_FREE(lock_db
);
106 /*******************************************************************
107 Form a static locking key for a dev/inode pair.
108 ******************************************************************/
110 static TDB_DATA
locking_key(const struct file_id
*id
)
112 return make_tdb_data((const uint8_t *)id
, sizeof(*id
));
115 /*******************************************************************
116 Get all share mode entries for a dev/inode pair.
117 ********************************************************************/
119 static struct share_mode_data
*parse_share_modes(TALLOC_CTX
*mem_ctx
,
122 struct share_mode_data
*d
;
123 enum ndr_err_code ndr_err
;
126 d
= talloc(mem_ctx
, struct share_mode_data
);
128 DEBUG(0, ("talloc failed\n"));
132 blob
.data
= dbuf
.dptr
;
133 blob
.length
= dbuf
.dsize
;
135 ndr_err
= ndr_pull_struct_blob(
136 &blob
, d
, d
, (ndr_pull_flags_fn_t
)ndr_pull_share_mode_data
);
137 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err
)) {
138 DEBUG(1, ("ndr_pull_share_mode_lock failed: %s\n",
139 ndr_errstr(ndr_err
)));
146 if (DEBUGLEVEL
>= 10) {
147 DEBUG(10, ("parse_share_modes:\n"));
148 NDR_PRINT_DEBUG(share_mode_data
, d
);
157 /*******************************************************************
158 Create a storable data blob from a modified share_mode_data struct.
159 ********************************************************************/
161 static TDB_DATA
unparse_share_modes(struct share_mode_data
*d
)
164 enum ndr_err_code ndr_err
;
166 if (DEBUGLEVEL
>= 10) {
167 DEBUG(10, ("unparse_share_modes:\n"));
168 NDR_PRINT_DEBUG(share_mode_data
, d
);
171 if (d
->num_share_modes
== 0) {
172 DEBUG(10, ("No used share mode found\n"));
173 return make_tdb_data(NULL
, 0);
176 ndr_err
= ndr_push_struct_blob(
177 &blob
, d
, d
, (ndr_push_flags_fn_t
)ndr_push_share_mode_data
);
178 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err
)) {
179 smb_panic("ndr_push_share_mode_lock failed");
182 return make_tdb_data(blob
.data
, blob
.length
);
185 /*******************************************************************
186 If modified, store the share_mode_data back into the database.
187 ********************************************************************/
189 static int share_mode_data_destructor(struct share_mode_data
*d
)
198 data
= unparse_share_modes(d
);
200 if (data
.dptr
== NULL
) {
202 /* There has been an entry before, delete it */
204 status
= dbwrap_record_delete(d
->record
);
205 if (!NT_STATUS_IS_OK(status
)) {
208 DEBUG(0, ("delete_rec returned %s\n",
211 if (asprintf(&errmsg
, "could not delete share "
213 nt_errstr(status
)) == -1) {
214 smb_panic("could not delete share"
223 status
= dbwrap_record_store(d
->record
, data
, TDB_REPLACE
);
224 if (!NT_STATUS_IS_OK(status
)) {
227 DEBUG(0, ("store returned %s\n", nt_errstr(status
)));
229 if (asprintf(&errmsg
, "could not store share mode entry: %s",
230 nt_errstr(status
)) == -1) {
231 smb_panic("could not store share mode entry");
241 /*******************************************************************
242 Allocate a new share_mode_data struct, mark it unmodified.
243 fresh is set to note that currently there is no database entry.
244 ********************************************************************/
246 static struct share_mode_data
*fresh_share_mode_lock(
247 TALLOC_CTX
*mem_ctx
, const char *servicepath
,
248 const struct smb_filename
*smb_fname
,
249 const struct timespec
*old_write_time
)
251 struct share_mode_data
*d
;
253 if ((servicepath
== NULL
) || (smb_fname
== NULL
) ||
254 (old_write_time
== NULL
)) {
258 d
= talloc_zero(mem_ctx
, struct share_mode_data
);
262 d
->base_name
= talloc_strdup(d
, smb_fname
->base_name
);
263 if (d
->base_name
== NULL
) {
266 if (smb_fname
->stream_name
!= NULL
) {
267 d
->stream_name
= talloc_strdup(d
, smb_fname
->stream_name
);
268 if (d
->stream_name
== NULL
) {
272 d
->servicepath
= talloc_strdup(d
, servicepath
);
273 if (d
->servicepath
== NULL
) {
276 d
->old_write_time
= *old_write_time
;
281 DEBUG(0, ("talloc failed\n"));
286 /*******************************************************************
287 Either fetch a share mode from the database, or allocate a fresh
288 one if the record doesn't exist.
289 ********************************************************************/
291 static struct share_mode_lock
*get_share_mode_lock_internal(
292 TALLOC_CTX
*mem_ctx
, struct file_id id
,
293 const char *servicepath
, const struct smb_filename
*smb_fname
,
294 const struct timespec
*old_write_time
)
296 struct share_mode_lock
*lck
;
297 struct share_mode_data
*d
;
298 struct db_record
*rec
;
299 TDB_DATA key
= locking_key(&id
);
302 rec
= dbwrap_fetch_locked(lock_db
, mem_ctx
, key
);
304 DEBUG(3, ("Could not lock share entry\n"));
308 value
= dbwrap_record_get_value(rec
);
310 if (value
.dptr
== NULL
) {
311 d
= fresh_share_mode_lock(mem_ctx
, servicepath
, smb_fname
,
314 d
= parse_share_modes(mem_ctx
, value
);
318 DEBUG(5, ("get_share_mode_lock_internal: "
319 "Could not get share mode lock\n"));
324 d
->record
= talloc_move(d
, &rec
);
325 talloc_set_destructor(d
, share_mode_data_destructor
);
327 lck
= talloc(mem_ctx
, struct share_mode_lock
);
329 DEBUG(1, ("talloc failed\n"));
333 lck
->data
= talloc_move(lck
, &d
);
338 * We can only ever have one share mode locked. Users of
339 * get_share_mode_lock never see this, it will be refcounted by
342 static struct share_mode_lock
*the_lock
;
344 static int the_lock_destructor(struct share_mode_lock
*l
)
350 /*******************************************************************
351 Get a share_mode_lock, Reference counted to allow nested calls.
352 ********************************************************************/
354 struct share_mode_lock
*get_share_mode_lock(
357 const char *servicepath
,
358 const struct smb_filename
*smb_fname
,
359 const struct timespec
*old_write_time
)
361 TALLOC_CTX
*frame
= talloc_stackframe();
363 struct share_mode_lock
*lck
;
365 if (the_lock
== NULL
) {
366 the_lock
= get_share_mode_lock_internal(
367 frame
, id
, servicepath
, smb_fname
, old_write_time
);
368 if (the_lock
== NULL
) {
371 talloc_set_destructor(the_lock
, the_lock_destructor
);
373 if (!file_id_equal(&the_lock
->data
->id
, &id
)) {
374 DEBUG(1, ("Can not lock two share modes simultaneously\n"));
377 lck
= talloc(mem_ctx
, struct share_mode_lock
);
379 DEBUG(1, ("talloc failed\n"));
382 if (talloc_reference(lck
, the_lock
) == NULL
) {
383 DEBUG(1, ("talloc_reference failed\n"));
386 lck
->data
= the_lock
->data
;
394 static void fetch_share_mode_unlocked_parser(
395 TDB_DATA key
, TDB_DATA data
, void *private_data
)
397 struct share_mode_lock
*lck
= talloc_get_type_abort(
398 private_data
, struct share_mode_lock
);
400 lck
->data
= parse_share_modes(lck
, data
);
403 /*******************************************************************
404 Get a share_mode_lock without locking the database or reference
405 counting. Used by smbstatus to display existing share modes.
406 ********************************************************************/
408 struct share_mode_lock
*fetch_share_mode_unlocked(TALLOC_CTX
*mem_ctx
,
411 struct share_mode_lock
*lck
;
412 TDB_DATA key
= locking_key(&id
);
415 lck
= talloc(mem_ctx
, struct share_mode_lock
);
417 DEBUG(0, ("talloc failed\n"));
420 status
= dbwrap_parse_record(
421 lock_db
, key
, fetch_share_mode_unlocked_parser
, lck
);
422 if (!NT_STATUS_IS_OK(status
) ||
423 (lck
->data
== NULL
)) {
430 struct forall_state
{
431 void (*fn
)(const struct share_mode_entry
*entry
,
432 const char *sharepath
,
438 static int traverse_fn(struct db_record
*rec
, void *_state
)
440 struct forall_state
*state
= (struct forall_state
*)_state
;
445 enum ndr_err_code ndr_err
;
446 struct share_mode_data
*d
;
448 key
= dbwrap_record_get_key(rec
);
449 value
= dbwrap_record_get_value(rec
);
451 /* Ensure this is a locking_key record. */
452 if (key
.dsize
!= sizeof(struct file_id
))
455 d
= talloc(talloc_tos(), struct share_mode_data
);
460 blob
.data
= value
.dptr
;
461 blob
.length
= value
.dsize
;
463 ndr_err
= ndr_pull_struct_blob(
464 &blob
, d
, d
, (ndr_pull_flags_fn_t
)ndr_pull_share_mode_data
);
465 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err
)) {
466 DEBUG(1, ("ndr_pull_share_mode_lock failed\n"));
469 if (DEBUGLEVEL
> 10) {
470 DEBUG(11, ("parse_share_modes:\n"));
471 NDR_PRINT_DEBUG(share_mode_data
, d
);
473 for (i
=0; i
<d
->num_share_modes
; i
++) {
474 state
->fn(&d
->share_modes
[i
],
475 d
->servicepath
, d
->base_name
,
476 state
->private_data
);
483 /*******************************************************************
484 Call the specified function on each entry under management by the
486 ********************************************************************/
488 int share_mode_forall(void (*fn
)(const struct share_mode_entry
*, const char *,
489 const char *, void *),
492 struct forall_state state
;
500 state
.private_data
= private_data
;
502 status
= dbwrap_traverse_read(lock_db
, traverse_fn
, (void *)&state
,
505 if (!NT_STATUS_IS_OK(status
)) {
512 bool share_mode_cleanup_disconnected(struct file_id fid
,
513 uint64_t open_persistent_id
)
516 TALLOC_CTX
*frame
= talloc_stackframe();
518 struct share_mode_data
*data
;
519 struct share_mode_lock
*lck
;
522 lck
= get_existing_share_mode_lock(frame
, fid
);
524 DEBUG(5, ("share_mode_cleanup_disconnected: "
525 "Could not fetch share mode entry for %s\n",
526 file_id_string(frame
, &fid
)));
531 for (n
=0; n
< data
->num_share_modes
; n
++) {
532 struct share_mode_entry
*entry
= &data
->share_modes
[n
];
534 if (!server_id_is_disconnected(&entry
->pid
)) {
535 DEBUG(5, ("share_mode_cleanup_disconnected: "
536 "file (file-id='%s', servicepath='%s', "
537 "base_name='%s%s%s') "
538 "is used by server %s ==> do not cleanup\n",
539 file_id_string(frame
, &fid
),
542 (data
->stream_name
== NULL
)
543 ? "" : "', stream_name='",
544 (data
->stream_name
== NULL
)
545 ? "" : data
->stream_name
,
546 server_id_str(frame
, &entry
->pid
)));
549 if (open_persistent_id
!= entry
->share_file_id
) {
550 DEBUG(5, ("share_mode_cleanup_disconnected: "
552 "(file-id='%s', servicepath='%s', "
553 "base_name='%s%s%s') "
554 "has share_file_id %llu but expected %llu"
555 "==> do not cleanup\n",
556 file_id_string(frame
, &fid
),
559 (data
->stream_name
== NULL
)
560 ? "" : "', stream_name='",
561 (data
->stream_name
== NULL
)
562 ? "" : data
->stream_name
,
563 (unsigned long long)entry
->share_file_id
,
564 (unsigned long long)open_persistent_id
));
569 ok
= brl_cleanup_disconnected(fid
, open_persistent_id
);
571 DEBUG(10, ("share_mode_cleanup_disconnected: "
572 "failed to clean up byte range locks associated "
573 "with file (file-id='%s', servicepath='%s', "
574 "base_name='%s%s%s') and open_persistent_id %llu "
575 "==> do not cleanup\n",
576 file_id_string(frame
, &fid
),
579 (data
->stream_name
== NULL
)
580 ? "" : "', stream_name='",
581 (data
->stream_name
== NULL
)
582 ? "" : data
->stream_name
,
583 (unsigned long long)open_persistent_id
));
587 DEBUG(10, ("share_mode_cleanup_disconnected: "
588 "cleaning up %u entries for file "
589 "(file-id='%s', servicepath='%s', "
590 "base_name='%s%s%s') "
591 "from open_persistent_id %llu\n",
592 data
->num_share_modes
,
593 file_id_string(frame
, &fid
),
596 (data
->stream_name
== NULL
)
597 ? "" : "', stream_name='",
598 (data
->stream_name
== NULL
)
599 ? "" : data
->stream_name
,
600 (unsigned long long)open_persistent_id
));
602 data
->num_share_modes
= 0;
603 data
->modified
= true;