/*
destroy a freeze handle
*/
static int ctdb_freeze_handle_destructor(struct ctdb_freeze_handle *h)
{
struct ctdb_context *ctdb = h->ctdb;
DEBUG(DEBUG_ERR,("Release freeze handle\n"));
/* cancel any pending transactions */
if (ctdb->freeze_transaction_started) {
ctdb_db_iterator(ctdb, db_transaction_cancel_handler, NULL);
ctdb->freeze_transaction_started = false;
}
ctdb_db_iterator(ctdb, db_thaw, NULL);
ctdb->freeze_mode = CTDB_FREEZE_NONE;
ctdb->freeze_handle = NULL;
return 0;
}
/*
block until we are frozen, used during daemon startup
*/
bool ctdb_blocking_freeze(struct ctdb_context *ctdb)
{
int ret;
ret = ctdb_db_iterator(ctdb, db_freeze_block, ctdb->ev);
if (ret != 0) {
return false;
}
return true;
}
static int ctdb_lockall_unmark(struct ctdb_context *ctdb)
{
uint32_t priority;
for (priority=NUM_DB_PRIORITIES; priority>0; priority--) {
if (ctdb_db_iterator(ctdb, priority, db_lock_unmark_handler, NULL) != 0) {
return -1;
}
}
return 0;
}
/*
thaw the databases
*/
int32_t ctdb_control_thaw(struct ctdb_context *ctdb, bool check_recmode)
{
if (check_recmode && ctdb->recovery_mode == CTDB_RECOVERY_ACTIVE) {
DEBUG(DEBUG_ERR, ("Failing to thaw databases while "
"recovery is active\n"));
return -1;
}
DEBUG(DEBUG_ERR,("Thawing all\n"));
/* cancel any pending transactions */
if (ctdb->freeze_transaction_started) {
ctdb_db_iterator(ctdb, db_transaction_cancel_handler, NULL);
ctdb->freeze_transaction_started = false;
}
ctdb_db_iterator(ctdb, db_thaw, NULL);
TALLOC_FREE(ctdb->freeze_handle);
ctdb_call_resend_all(ctdb);
return 0;
}
int ctdb_lockall_unmark_prio(struct ctdb_context *ctdb, uint32_t priority)
{
/*
* This function is only used by the main dameon during recovery.
* At this stage, the databases have already been locked, by a
* dedicated child process. The freeze_mode variable is used to track
* whether the actual locks are held by the child process or not.
*/
if (ctdb->freeze_mode[priority] != CTDB_FREEZE_FROZEN) {
DEBUG(DEBUG_ERR, ("Attempt to unmark all databases locked when not frozen\n"));
return -1;
}
return ctdb_db_iterator(ctdb, priority, db_lock_unmark_handler, NULL);
}
/*
start the freeze process for a certain priority
*/
static void ctdb_start_freeze(struct ctdb_context *ctdb)
{
struct ctdb_freeze_handle *h;
int ret;
if (ctdb->freeze_mode == CTDB_FREEZE_FROZEN) {
int count = 0;
/*
* Check if all the databases are frozen
*
* It's possible that the databases can get attached after
* initial freeze. This typically happens during startup as
* CTDB will only attach persistent databases and go in to
* startup freeze. The recovery master during recovery will
* attach all the missing databases.
*/
h = ctdb->freeze_handle;
if (h == NULL) {
ctdb->freeze_mode = CTDB_FREEZE_NONE;
return;
}
ret = ctdb_db_iterator(ctdb, db_count, &count);
if (ret != 0) {
TALLOC_FREE(ctdb->freeze_handle);
ctdb->freeze_mode = CTDB_FREEZE_NONE;
return;
}
if (count != h->num_total) {
DEBUG(DEBUG_ERR, ("Freeze all: incremental\n"));
h->num_total = count;
h->num_locked = 0;
h->num_failed = 0;
ctdb->freeze_mode = CTDB_FREEZE_PENDING;
ret = ctdb_db_iterator(ctdb, db_freeze, h);
if (ret != 0) {
TALLOC_FREE(ctdb->freeze_handle);
ctdb->freeze_mode = CTDB_FREEZE_NONE;
}
}
return;
}
if (ctdb->freeze_handle != NULL) {
/* already trying to freeze */
return;
}
DEBUG(DEBUG_ERR, ("Freeze all\n"));
/* Stop any vacuuming going on: we don't want to wait. */
ctdb_stop_vacuuming(ctdb);
/* create freeze lock children for each database */
h = talloc_zero(ctdb, struct ctdb_freeze_handle);
CTDB_NO_MEMORY_FATAL(ctdb, h);
h->ctdb = ctdb;
talloc_set_destructor(h, ctdb_freeze_handle_destructor);
ctdb->freeze_handle = h;
ret = ctdb_db_iterator(ctdb, db_count, &h->num_total);
if (ret != 0) {
talloc_free(h);
return;
}
ctdb->freeze_mode = CTDB_FREEZE_PENDING;
ret = ctdb_db_iterator(ctdb, db_freeze, h);
if (ret != 0) {
talloc_free(h);
return;
}
if (h->num_total == 0) {
ctdb->freeze_mode = CTDB_FREEZE_FROZEN;
}
}