4 Copyright (C) Ronnie sahlberg 2010
5 Copyright (C) Rusty Russell 2010
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, see <http://www.gnu.org/licenses/>.
23 #include <sys/types.h>
29 #include <netinet/in.h>
30 #include <ctdb_protocol.h>
33 * ctdb - a library for accessing tdbs controlled by ctdbd
35 * ctdbd (clustered tdb daemon) is a daemon designed to syncronize TDB
36 * databases across a cluster. Using this library, you can communicate with
37 * the daemon to access the databases, pass messages across the cluster, and
38 * control the daemon itself.
40 * The general API is event-driven and asynchronous: you call the
41 * *_send functions, supplying callbacks, then when the ctdbd file
42 * descriptor is usable, call ctdb_service() to perform read from it
43 * and call your callbacks, which use the *_recv functions to unpack
44 * the replies from ctdbd.
46 * There is also a synchronous wrapper for each function for trivial
47 * programs; these can be found in the section marked "Synchronous API".
51 * ctdb_log_fn_t - logging function for ctdbd
52 * @log_priv: private (typesafe) arg via ctdb_connect
53 * @severity: syslog-style severity
54 * @format: printf-style format string.
55 * @ap: arguments for formatting.
57 * The severity passed to log() are as per syslog(3). In particular,
58 * LOG_DEBUG is used for tracing, LOG_WARNING is used for unusual
59 * conditions which don't necessarily return an error through the API,
60 * LOG_ERR is used for errors such as lost communication with ctdbd or
61 * out-of-memory, LOG_ALERT is used for library usage bugs, LOG_CRIT is
62 * used for libctdb internal consistency checks.
64 * The log() function can be typesafe: the @log_priv arg to
65 * ctdb_donnect and signature of log() should match.
67 typedef void (*ctdb_log_fn_t)(void *log_priv,
68 int severity, const char *format, va_list ap);
71 * ctdb_connect - connect to ctdb using the specified domain socket.
72 * @addr: the socket address, or NULL for default
73 * @log: the logging function
74 * @log_priv: the private argument to the logging function.
76 * Returns a ctdb context if successful or NULL. Use ctdb_disconnect() to
77 * release the returned ctdb_connection when finished.
80 * ctdb_log_fn_t, ctdb_log_file()
82 struct ctdb_connection *ctdb_connect(const char *addr,
83 ctdb_log_fn_t log_fn, void *log_priv);
86 * ctdb_log_file - example logging function
88 * Logs everything at priority LOG_WARNING or above to the file given (via
89 * the log_priv argument, usually stderr).
91 void ctdb_log_file(FILE *, int, const char *, va_list);
94 * ctdb_log_level - level at which to call logging function
96 * This variable globally controls filtering on the logging function.
97 * It is initialized to LOG_WARNING, meaning that strange but nonfatal
98 * events, as well as errors and API misuses are reported.
100 * Set it to LOG_DEBUG to receive all messages.
102 extern int ctdb_log_level;
105 * ctdb_disconnect - close down a connection to ctdbd.
106 * @ctdb: the ctdb connectio returned from ctdb_connect.
108 * The @ctdb arg will be freed by this call, and must not be used again.
110 void ctdb_disconnect(struct ctdb_connection *ctdb);
119 * ctdb_num_active - get the number of active commands
120 * @ctdb: the ctdb_connection from ctdb_connect.
122 * This command can be used to find the number of active commands we have
123 * issued. An active command is a command we have queued, or sent
124 * to the ctdb daemon but which we have not yet received a reply to.
127 * ctdb_num_in_flight(), ctdb_num_out_queue()
129 int ctdb_num_active(struct ctdb_connection *ctdb);
132 * ctdb_num_in_flight - get the number of commands in flight.
133 * @ctdb: the ctdb_connection from ctdb_connect.
135 * This command can be used to find the number of commands we have
136 * sent to the ctdb daemon to which we have not yet received/processed
140 * ctdb_num_out_queue(), ctdb_num_active()
142 int ctdb_num_in_flight(struct ctdb_connection *ctdb);
145 * ctdb_num_out_queue - get the number of commands in the out queue
146 * @ctdb: the ctdb_connection from ctdb_connect.
148 * This command can be used to find the number of commands we have
149 * queued for delivery to the ctdb daemon but have not yet been
150 * written to the domain socket.
153 * ctdb_num_in_flight(), ctdb_num_active()
155 int ctdb_num_out_queue(struct ctdb_connection *ctdb);
158 * ctdb_get_fd - get the filedescriptor to select/poll on
159 * @ctdb: the ctdb_connection from ctdb_connect.
161 * By using poll or select on this file descriptor, you will know when to call
165 * ctdb_which_events(), ctdb_service()
167 int ctdb_get_fd(struct ctdb_connection *ctdb);
170 * ctdb_which_events - determine which events ctdb_service wants to see
171 * @ctdb: the ctdb_connection from ctdb_connect.
173 * This returns POLLIN, possibly or'd with POLLOUT if there are writes
174 * pending. You can set this straight into poll.events.
179 int ctdb_which_events(struct ctdb_connection *ctdb);
182 * ctdb_service - service any I/O and callbacks from ctdbd communication
183 * @ctdb: the ctdb_connection from ctdb_connect.
184 * @revents: which events are available.
186 * This is the core of the library: it read and writes to the ctdbd
187 * socket. It may call callbacks registered with the various _send
190 * revents is a bitset: POLLIN and/or POLLOUT may be set to indicate
191 * it is worth attempting to read/write the (nonblocking)
192 * filedescriptor respectively.
194 * Note that the synchronous functions call this internally.
195 * Returns false on catastrophic failure.
197 bool ctdb_service(struct ctdb_connection *ctdb, int revents);
200 * struct ctdb_request - handle for an outstanding request
202 * This opaque structure returned from various *_send functions gives
203 * you a handle by which you can cancel a request. You can't do
204 * anything else with it until the request is completed and it is
205 * handed to your callback function.
210 * ctdb_request_free - free a completed request
212 * This frees a request: you should only call it once it has been
213 * handed to your callback. For incomplete requests, see ctdb_cancel().
215 void ctdb_request_free(struct ctdb_request *req);
218 * ctdb_callback_t - callback for completed requests.
220 * This would normally unpack the request using ctdb_*_recv(). You
221 * must free the request using ctdb_request_free().
223 * Note that due to macro magic, actual your callback can be typesafe:
224 * instead of taking a void *, it can take a type which matches the
225 * actual private parameter.
227 typedef void (*ctdb_callback_t)(struct ctdb_connection *ctdb,
228 struct ctdb_request *req, void *private_data);
231 * struct ctdb_db - connection to a particular open TDB
233 * This represents a particular open database: you receive it from
234 * ctdb_attachdb or ctdb_attachdb_recv to manipulate a database.
236 * You have to free the handle with ctdb_detachdb() when finished with it.
241 * ctdb_attachdb_send - open a clustered TDB
242 * @ctdb: the ctdb_connection from ctdb_connect.
243 * @name: the filename of the database (no /).
244 * @persistent: whether the database is persistent across ctdbd's life
245 * @tdb_flags: the flags to pass to tdb_open.
246 * @callback: the callback when we're attached or failed (typesafe)
247 * @cbdata: the argument to callback()
249 * This function connects to a TDB controlled by ctdbd. It can create
250 * a new TDB if it does not exist, depending on tdb_flags. Returns
251 * the pending request, or NULL on error.
253 struct ctdb_request *
254 ctdb_attachdb_send(struct ctdb_connection *ctdb,
255 const char *name, bool persistent, uint32_t tdb_flags,
256 ctdb_callback_t callback, void *cbdata);
259 * ctdb_attachdb_recv - read an ctdb_attach reply from ctdbd
260 * @ctdb: the ctdb_connection from ctdb_connect.
261 * @req: the completed request.
263 * This returns NULL if something went wrong, or otherwise the open database.
265 struct ctdb_db *ctdb_attachdb_recv(struct ctdb_connection *ctdb,
266 struct ctdb_request *req);
270 * struct ctdb_lock - a record lock on a clustered TDB database
272 * This locks a subset of the database across the entire cluster; it
273 * is the fundamental sychronization element for ctdb. You cannot have
274 * more than one lock at once.
276 * You MUST NOT block during holding this lock and MUST release it
277 * quickly by performing ctdb_release_lock(lock).
278 * Do NOT make any system calls that may block while holding the lock.
280 * Try to release the lock as quickly as possible.
285 * ctdb_rrl_callback_t - callback for ctdb_readrecordlock_async
287 * This is not the standard ctdb_callback_t, because there is often no
288 * request required to access a database record (ie. if it is local already).
289 * So the callback is handed the lock directly: it might be NULL if there
290 * was an error obtaining the lock.
293 * ctdb_readrecordlock_async(), ctdb_readrecordlock()
295 typedef void (*ctdb_rrl_callback_t)(struct ctdb_db *ctdb_db,
296 struct ctdb_lock *lock,
301 * ctdb_readrecordlock_async - read and lock a record
302 * @ctdb_db: the database handle from ctdb_attachdb/ctdb_attachdb_recv.
303 * @key: the key of the record to lock.
304 * @callback: the callback once the record is locked (typesafe).
305 * @cbdata: the argument to callback()
307 * This returns true on success. Commonly, we can obtain the record
308 * immediately and so the callback will be invoked. Otherwise a request
309 * will be queued to ctdbd for the record.
311 * If failure is immediate, false is returned. Otherwise, the callback
312 * may receive a NULL lock arg to indicate asynchronous failure.
314 bool ctdb_readrecordlock_async(struct ctdb_db *ctdb_db, TDB_DATA key,
315 ctdb_rrl_callback_t callback, void *cbdata);
318 * ctdb_readonlyrecordlock_async - read and lock a record for read-only access
319 * @ctdb_db: the database handle from ctdb_attachdb/ctdb_attachdb_recv.
320 * @key: the key of the record to lock.
321 * @callback: the callback once the record is locked (typesafe).
322 * @cbdata: the argument to callback()
324 * This returns true on success. Commonly, we can obtain the record
325 * immediately and so the callback will be invoked. Otherwise a request
326 * will be queued to ctdbd for the record.
328 * If failure is immediate, false is returned. Otherwise, the callback
329 * may receive a NULL lock arg to indicate asynchronous failure.
331 bool ctdb_readonlyrecordlock_async(struct ctdb_db *ctdb_db, TDB_DATA key,
332 ctdb_rrl_callback_t callback, void *cbdata);
336 * ctdb_writerecord - write a locked record in a TDB
337 * @ctdb_db: the database handle from ctdb_attachdb/ctdb_attachdb_recv.
338 * @lock: the lock from ctdb_readrecordlock/ctdb_readrecordlock_recv
339 * @data: the new data to place in the record.
341 bool ctdb_writerecord(struct ctdb_db *ctdb_db,
342 struct ctdb_lock *lock, TDB_DATA data);
345 * ctdb_release_lock - release a record lock on a TDB
346 * @ctdb_db: the database handle from ctdb_attachdb/ctdb_attachdb_recv.
347 * @lock: the lock from ctdb_readrecordlock/ctdb_readrecordlock_async
349 void ctdb_release_lock(struct ctdb_db *ctdb_db, struct ctdb_lock *lock);
354 * ctdb_traverse_callback_t - callback for ctdb_traverse_async.
355 * return 0 - to continue traverse
356 * return 1 - to abort the traverse
359 * ctdb_traverse_async()
361 #define TRAVERSE_STATUS_RECORD 0
362 #define TRAVERSE_STATUS_FINISHED 1
363 #define TRAVERSE_STATUS_ERROR 2
364 typedef int (*ctdb_traverse_callback_t)(struct ctdb_connection *ctdb,
365 struct ctdb_db *ctdb_db,
372 * ctdb_traverse_async - traverse a database.
373 * @ctdb_db: the database handle from ctdb_attachdb/ctdb_attachdb_recv.
374 * @callback: the callback once the record is locked (typesafe).
375 * @cbdata: the argument to callback()
377 * This returns true on success.
378 * when successfull, the callback will be invoked for each record
379 * until the traversal is finished.
382 * TRAVERSE_STATUS_RECORD key/data contains a record.
383 * TRAVERSE_STATUS_FINISHED traverse is finished. key/data is undefined.
384 * TRAVERSE_STATUS_ERROR an error occured during traverse.
385 * key/data is undefined.
387 * If failure is immediate, false is returned.
389 bool ctdb_traverse_async(struct ctdb_db *ctdb_db,
390 ctdb_traverse_callback_t callback, void *cbdata);
393 * ctdb_message_fn_t - messaging callback for ctdb messages
395 * ctdbd provides a simple messaging API; you can register for a particular
396 * 64-bit id on which you want to send messages, and send to other ids.
399 * ctdb_set_message_handler_send()
401 typedef void (*ctdb_message_fn_t)(struct ctdb_connection *,
402 uint64_t srvid, TDB_DATA data, void *);
405 * ctdb_set_message_handler_send - register for messages to a srvid
406 * @ctdb: the ctdb_connection from ctdb_connect.
407 * @srvid: the 64 bit identifier for our messages.
408 * @handler: the callback when we receive such a message (typesafe)
409 * @handler_data: the argument to handler()
410 * @callback: the callback when ctdb replies to our message (typesafe)
411 * @cbdata: the argument to callback()
413 * Note: our callback will always be called before handler.
416 * ctdb_set_message_handler_recv(), ctdb_remove_message_handler_send()
418 struct ctdb_request *
419 ctdb_set_message_handler_send(struct ctdb_connection *ctdb, uint64_t srvid,
420 ctdb_message_fn_t handler,
422 ctdb_callback_t callback,
426 * ctdb_set_message_handler_recv - read a set_message_handler result
427 * @ctdb: the ctdb_connection from ctdb_connect.
428 * @req: the completed request
430 * If this returns true, the registered handler may be called from the next
431 * ctdb_service(). If this returns false, the registration failed.
433 bool ctdb_set_message_handler_recv(struct ctdb_connection *ctdb,
434 struct ctdb_request *handle);
437 * ctdb_remove_message_handler_send - unregister for messages to a srvid
438 * @ctdb: the ctdb_connection from ctdb_connect.
439 * @srvid: the 64 bit identifier for our messages.
440 * @handler: the callback when we receive such a message (typesafe)
441 * @handler_data: the argument to handler()
442 * @callback: the callback when ctdb replies to our message (typesafe)
443 * @cbdata: the argument to callback()
445 * This undoes a successful ctdb_set_message_handler or
446 * ctdb_set_message_handler_recv.
448 struct ctdb_request *
449 ctdb_remove_message_handler_send(struct ctdb_connection *ctdb, uint64_t srvid,
450 ctdb_message_fn_t handler, void *handler_data,
451 ctdb_callback_t callback, void *cbdata);
454 * ctdb_remove_message_handler_recv - read a remove_message_handler result
455 * @ctdb: the ctdb_connection from ctdb_connect.
456 * @req: the completed request
458 * After this returns true, the registered handler will no longer be called.
459 * If this returns false, the de-registration failed.
461 bool ctdb_remove_message_handler_recv(struct ctdb_connection *ctdb,
462 struct ctdb_request *req);
466 * ctdb_send_message - send a message via ctdbd
467 * @ctdb: the ctdb_connection from ctdb_connect.
468 * @pnn: the physical node number to send to
469 * @srvid: the 64 bit identifier for this message type.
470 * @data: the data to send
472 * This allows arbitrary messages to be sent across the cluster to those
473 * listening (via ctdb_set_message_handler et al).
475 * This queues a message to be sent: you will need to call
476 * ctdb_service() to actually send the message. There is no callback
477 * because there is no acknowledgement.
480 * ctdb_getpnn_send(), ctdb_getpnn()
482 bool ctdb_send_message(struct ctdb_connection *ctdb, uint32_t pnn, uint64_t srvid, TDB_DATA data);
485 * ctdb_getpnn_send - read the pnn number of a node.
486 * @ctdb: the ctdb_connection from ctdb_connect.
487 * @destnode: the destination node (see below)
488 * @callback: the callback when ctdb replies to our message (typesafe)
489 * @cbdata: the argument to callback()
491 * There are several special values for destnode, detailed in
492 * ctdb_protocol.h, particularly CTDB_CURRENT_NODE which means the
495 struct ctdb_request *
496 ctdb_getpnn_send(struct ctdb_connection *ctdb,
498 ctdb_callback_t callback,
501 * ctdb_getpnn_recv - read an ctdb_getpnn reply from ctdbd
502 * @ctdb: the ctdb_connection from ctdb_connect.
503 * @req: the completed request.
504 * @pnn: a pointer to the pnn to fill in
506 * This returns false if something went wrong, or otherwise fills in pnn.
508 bool ctdb_getpnn_recv(struct ctdb_connection *ctdb,
509 struct ctdb_request *req, uint32_t *pnn);
513 * ctdb_getdbseqnum_send - read the sequence number off a db
514 * @ctdb: the ctdb_connection from ctdb_connect.
515 * @destnode: the destination node (see below)
517 * @callback: the callback when ctdb replies to our message (typesafe)
518 * @cbdata: the argument to callback()
520 * There are several special values for destnode, detailed in
521 * ctdb_protocol.h, particularly CTDB_CURRENT_NODE which means the
524 struct ctdb_request *
525 ctdb_getdbseqnum_send(struct ctdb_connection *ctdb,
528 ctdb_callback_t callback,
531 * ctdb_getdbseqnum_recv - read the sequence number off a database
532 * @ctdb: the ctdb_connection from ctdb_connect.
533 * @req: the completed request.
534 * @seqnum: a pointer to the seqnum to fill in
536 * This returns false if something went wrong, or otherwise fills in pnn.
538 bool ctdb_getdbseqnum_recv(struct ctdb_connection *ctdb,
539 struct ctdb_request *req, uint64_t *seqnum);
542 * ctdb_getnodemap_send - read the nodemap number from a node.
543 * @ctdb: the ctdb_connection from ctdb_connect.
544 * @destnode: the destination node (see below)
545 * @callback: the callback when ctdb replies to our message (typesafe)
546 * @cbdata: the argument to callback()
548 * There are several special values for destnode, detailed in
549 * ctdb_protocol.h, particularly CTDB_CURRENT_NODE which means the
552 struct ctdb_request *
553 ctdb_getnodemap_send(struct ctdb_connection *ctdb,
555 ctdb_callback_t callback,
558 * ctdb_getnodemap_recv - read an ctdb_getnodemap reply from ctdbd
559 * @ctdb: the ctdb_connection from ctdb_connect.
560 * @req: the completed request.
561 * @nodemap: a pointer to the returned nodemap structure
563 * This returns false if something went wrong.
564 * If the command failed, it guarantees to set nodemap to NULL.
565 * A non-NULL value for nodemap means the command was successful.
567 * A non-NULL value of the nodemap must be release released/freed
568 * by ctdb_free_nodemap().
570 bool ctdb_getnodemap_recv(struct ctdb_connection *ctdb,
571 struct ctdb_request *req, struct ctdb_node_map **nodemap);
574 * ctdb_getpublicips_send - read the public ip list from a node.
575 * @ctdb: the ctdb_connection from ctdb_connect.
576 * @destnode: the destination node (see below)
577 * @callback: the callback when ctdb replies to our message (typesafe)
578 * @cbdata: the argument to callback()
580 * This control returns the list of public ips known to the local node.
581 * Deamons only know about those ips that are listed in the local
582 * public addresses file, which means the returned list of ips may
583 * be only a subset of all ips across the entire cluster.
585 * There are several special values for destnode, detailed in
586 * ctdb_protocol.h, particularly CTDB_CURRENT_NODE which means the
589 struct ctdb_request *
590 ctdb_getpublicips_send(struct ctdb_connection *ctdb,
592 ctdb_callback_t callback,
595 * ctdb_getpublicips_recv - read the public ip list from a node
596 * @ctdb: the ctdb_connection from ctdb_connect.
597 * @req: the completed request.
598 * @ips: a pointer to the returned public ip list
600 * This returns false if something went wrong.
601 * If the command failed, it guarantees to set ips to NULL.
602 * A non-NULL value for nodemap means the command was successful.
604 * A non-NULL value of the nodemap must be release released/freed
605 * by ctdb_free_publicips().
607 bool ctdb_getpublicips_recv(struct ctdb_connection *ctdb,
608 struct ctdb_request *req, struct ctdb_all_public_ips **ips);
612 * ctdb_getrecmaster_send - read the recovery master of a node
613 * @ctdb: the ctdb_connection from ctdb_connect.
614 * @destnode: the destination node (see below)
615 * @callback: the callback when ctdb replies to our message (typesafe)
616 * @cbdata: the argument to callback()
618 * There are several special values for destnode, detailed in
619 * ctdb_protocol.h, particularly CTDB_CURRENT_NODE which means the
622 struct ctdb_request *
623 ctdb_getrecmaster_send(struct ctdb_connection *ctdb,
625 ctdb_callback_t callback, void *cbdata);
628 * ctdb_getrecmaster_recv - read an ctdb_getrecmaster reply from ctdbd
629 * @ctdb: the ctdb_connection from ctdb_connect.
630 * @req: the completed request.
631 * @recmaster: a pointer to the recmaster to fill in
633 * This returns false if something went wrong, or otherwise fills in
636 bool ctdb_getrecmaster_recv(struct ctdb_connection *ctdb,
637 struct ctdb_request *handle,
638 uint32_t *recmaster);
641 * ctdb_getrecmode_send - read the recovery mode of a node
642 * @ctdb: the ctdb_connection from ctdb_connect.
643 * @destnode: the destination node (see below)
644 * @callback: the callback when ctdb replies to our message (typesafe)
645 * @cbdata: the argument to callback()
647 * There are several special values for destnode, detailed in
648 * ctdb_protocol.h, particularly CTDB_CURRENT_NODE which means the
651 struct ctdb_request *
652 ctdb_getrecmode_send(struct ctdb_connection *ctdb,
654 ctdb_callback_t callback, void *cbdata);
657 * ctdb_getrecmode_recv - read an ctdb_getrecmode reply from ctdbd
658 * @ctdb: the ctdb_connection from ctdb_connect.
659 * @req: the completed request.
660 * @recmode: a pointer to the recmode to fill in
662 * This returns false if something went wrong, or otherwise fills in
665 bool ctdb_getrecmode_recv(struct ctdb_connection *ctdb,
666 struct ctdb_request *handle,
670 * ctdb_cancel - cancel an uncompleted request
671 * @ctdb: the ctdb_connection from ctdb_connect.
672 * @req: the uncompleted request.
674 * This cancels a request, returning true. You may not cancel a
675 * request which has already been completed (ie. once its callback has
676 * been called); you should simply use ctdb_request_free() in that case.
678 void ctdb_cancel(struct ctdb_connection *ctdb, struct ctdb_request *req);
687 * ctdb_attachdb - open a clustered TDB (synchronous)
688 * @ctdb: the ctdb_connection from ctdb_connect.
689 * @name: the filename of the database (no /).
690 * @persistent: whether the database is persistent across ctdbd's life
691 * @tdb_flags: the flags to pass to tdb_open.
693 * Do a ctdb_attachdb_send and wait for it to complete.
694 * Returns NULL on failure.
696 struct ctdb_db *ctdb_attachdb(struct ctdb_connection *ctdb,
697 const char *name, bool persistent,
701 * ctdb_detachdb - close a clustered TDB.
702 * @ctdb: the ctdb_connection from ctdb_connect.
703 * @db: the database from ctdb_attachdb/ctdb_attachdb_send
705 * Closes a clustered tdb.
707 void ctdb_detachdb(struct ctdb_connection *ctdb, struct ctdb_db *db);
710 * ctdb_readrecordlock - read and lock a record (synchronous)
711 * @ctdb: the ctdb_connection from ctdb_connect.
712 * @ctdb_db: the database handle from ctdb_attachdb/ctdb_attachdb_recv.
713 * @key: the key of the record to lock.
714 * @req: a pointer to the request, if one is needed.
716 * Do a ctdb_readrecordlock_send and wait for it to complete.
717 * Returns NULL on failure.
719 struct ctdb_lock *ctdb_readrecordlock(struct ctdb_connection *ctdb,
720 struct ctdb_db *ctdb_db, TDB_DATA key,
725 * ctdb_set_message_handler - register for messages to a srvid (synchronous)
726 * @ctdb: the ctdb_connection from ctdb_connect.
727 * @srvid: the 64 bit identifier for our messages.
728 * @handler: the callback when we receive such a message (typesafe)
729 * @cbdata: the argument to handler()
731 * If this returns true, the message handler can be called from any
732 * ctdb_service() (which is also called indirectly by other
733 * synchronous functions). If this returns false, the registration
736 bool ctdb_set_message_handler(struct ctdb_connection *ctdb, uint64_t srvid,
737 ctdb_message_fn_t handler, void *cbdata);
741 * ctdb_remove_message_handler - deregister for messages (synchronous)
742 * @ctdb: the ctdb_connection from ctdb_connect.
743 * @srvid: the 64 bit identifier for our messages.
744 * @handler: the callback when we receive such a message (typesafe)
745 * @handler_data: the argument to handler()
747 * If this returns true, the message handler will no longer be called.
748 * If this returns false, the deregistration failed.
750 bool ctdb_remove_message_handler(struct ctdb_connection *ctdb, uint64_t srvid,
751 ctdb_message_fn_t handler, void *handler_data);
754 * ctdb_getpnn - read the pnn number of a node (synchronous)
755 * @ctdb: the ctdb_connection from ctdb_connect.
756 * @destnode: the destination node (see below)
757 * @pnn: a pointer to the pnn to fill in
759 * There are several special values for destnode, detailed in
760 * ctdb_protocol.h, particularly CTDB_CURRENT_NODE which means the
763 * Returns true and fills in *pnn on success.
765 bool ctdb_getpnn(struct ctdb_connection *ctdb,
770 * ctdb_getdbseqnum - read the seqnum of a database
771 * @ctdb: the ctdb_connection from ctdb_connect.
772 * @destnode: the destination node (see below)
774 * @seqnum: sequence number for the database
776 * There are several special values for destnode, detailed in
777 * ctdb_protocol.h, particularly CTDB_CURRENT_NODE which means the
780 * Returns true and fills in *pnn on success.
783 ctdb_getdbseqnum(struct ctdb_connection *ctdb,
789 * ctdb_getrecmaster - read the recovery master of a node (synchronous)
790 * @ctdb: the ctdb_connection from ctdb_connect.
791 * @destnode: the destination node (see below)
792 * @recmaster: a pointer to the recmaster to fill in
794 * There are several special values for destnode, detailed in
795 * ctdb_protocol.h, particularly CTDB_CURRENT_NODE which means the
798 * Returns true and fills in *recmaster on success.
800 bool ctdb_getrecmaster(struct ctdb_connection *ctdb,
802 uint32_t *recmaster);
806 * ctdb_getrecmode - read the recovery mode of a node (synchronous)
807 * @ctdb: the ctdb_connection from ctdb_connect.
808 * @destnode: the destination node (see below)
809 * @recmode: a pointer to the recmode to fill in
811 * There are several special values for destnode, detailed in
812 * ctdb_protocol.h, particularly CTDB_CURRENT_NODE which means the
815 * Returns true and fills in *recmode on success.
817 bool ctdb_getrecmode(struct ctdb_connection *ctdb,
823 * ctdb_getnodemap - read the nodemap from a node (synchronous)
824 * @ctdb: the ctdb_connection from ctdb_connect.
825 * @destnode: the destination node (see below)
826 * @nodemap: a pointer to the nodemap to fill in
828 * There are several special values for destnode, detailed in
829 * ctdb_protocol.h, particularly CTDB_CURRENT_NODE which means the
832 * Returns true and fills in *nodemap on success.
833 * A non-NULL nodemap must be freed by calling ctdb_free_nodemap.
835 bool ctdb_getnodemap(struct ctdb_connection *ctdb,
836 uint32_t destnode, struct ctdb_node_map **nodemap);
839 * This function is used to release/free the nodemap structure returned
840 * by ctdb_getnodemap() and ctdb_getnodemap_recv()
842 void ctdb_free_nodemap(struct ctdb_node_map *nodemap);
846 * ctdb_getpublicips - read the public ip list from a node.
847 * @ctdb: the ctdb_connection from ctdb_connect.
848 * @destnode: the destination node (see below)
849 * @ips: a pointer to the returned public ip list
851 * This control returns the list of public ips known to the local node.
852 * Deamons only know about those ips that are listed in the local
853 * public addresses file, which means the returned list of ips may
854 * be only a subset of all ips across the entire cluster.
856 * There are several special values for destnode, detailed in
857 * ctdb_protocol.h, particularly CTDB_CURRENT_NODE which means the
860 * This returns false if something went wrong.
861 * If the command failed, it guarantees to set ips to NULL.
862 * A non-NULL value for nodemap means the command was successful.
864 * A non-NULL value of the nodemap must be release released/freed
865 * by ctdb_free_publicips().
867 bool ctdb_getpublicips(struct ctdb_connection *ctdb,
868 uint32_t destnode, struct ctdb_all_public_ips **ips);
871 * This function is used to release/free the public ip structure returned
872 * by ctdb_getpublicips() and ctdb_getpublicips_recv()
874 void ctdb_free_publicips(struct ctdb_all_public_ips *ips);
877 /* These ugly macro wrappers make the callbacks typesafe. */
878 #include <ctdb_typesafe_cb.h>
879 #define ctdb_sendcb(cb, cbdata) \
880 typesafe_cb_preargs(void, (cb), (cbdata), \
881 struct ctdb_connection *, struct ctdb_request *)
883 #define ctdb_msgcb(cb, cbdata) \
884 typesafe_cb_preargs(void, (cb), (cbdata), \
885 struct ctdb_connection *, uint64_t, TDB_DATA)
887 #define ctdb_connect(addr, log, logpriv) \
888 ctdb_connect((addr), \
889 typesafe_cb_postargs(void, (log), (logpriv), \
890 int, const char *, va_list), \
893 #define ctdb_set_message_handler(ctdb, srvid, handler, hdata) \
894 ctdb_set_message_handler((ctdb), (srvid), \
895 ctdb_msgcb((handler), (hdata)), (hdata))
897 #define ctdb_remove_message_handler(ctdb, srvid, handler, hdata) \
898 ctdb_remove_message_handler((ctdb), (srvid), \
899 ctdb_msgcb((handler), (hdata)), (hdata))
901 #define ctdb_attachdb_send(ctdb, name, persistent, tdb_flags, cb, cbdata) \
902 ctdb_attachdb_send((ctdb), (name), (persistent), (tdb_flags), \
903 ctdb_sendcb((cb), (cbdata)), (cbdata))
905 #define ctdb_readrecordlock_async(_ctdb_db, key, cb, cbdata) \
906 ctdb_readrecordlock_async((_ctdb_db), (key), \
907 typesafe_cb_preargs(void, (cb), (cbdata), \
908 struct ctdb_db *, struct ctdb_lock *, \
911 #define ctdb_set_message_handler_send(ctdb, srvid, handler, hdata, cb, cbdata) \
912 ctdb_set_message_handler_send((ctdb), (srvid), \
913 ctdb_msgcb((handler), (hdata)), (hdata), \
914 ctdb_sendcb((cb), (cbdata)), (cbdata))
916 #define ctdb_remove_message_handler_send(ctdb, srvid, handler, hdata, cb, cbdata) \
917 ctdb_remove_message_handler_send((ctdb), (srvid), \
918 ctdb_msgcb((handler), (hdata)), (hdata), \
919 ctdb_sendcb((cb), (cbdata)), (cbdata))
921 #define ctdb_getpnn_send(ctdb, destnode, cb, cbdata) \
922 ctdb_getpnn_send((ctdb), (destnode), \
923 ctdb_sendcb((cb), (cbdata)), (cbdata))
925 #define ctdb_getrecmaster_send(ctdb, destnode, cb, cbdata) \
926 ctdb_getrecmaster_send((ctdb), (destnode), \
927 ctdb_sendcb((cb), (cbdata)), (cbdata))
929 #define ctdb_getrecmode_send(ctdb, destnode, cb, cbdata) \
930 ctdb_getrecmode_send((ctdb), (destnode), \
931 ctdb_sendcb((cb), (cbdata)), (cbdata))
933 #define ctdb_getnodemap_send(ctdb, destnode, cb, cbdata) \
934 ctdb_getnodemap_send((ctdb), (destnode), \
935 ctdb_sendcb((cb), (cbdata)), (cbdata))
937 #define ctdb_getpublicips_send(ctdb, destnode, cb, cbdata) \
938 ctdb_getpublicips_send((ctdb), (destnode), \
939 ctdb_sendcb((cb), (cbdata)), (cbdata))
941 #define ctdb_getdbseqnum_send(ctdb, destnode, dbid, cb, cbdata) \
942 ctdb_getdbseqnum_send((ctdb), (destnode), (dbid), \
943 ctdb_sendcb((cb), (cbdata)), (cbdata))