along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
-#include "lib/events/events.h"
+#include "lib/tevent/tevent.h"
#include "lib/tdb/include/tdb.h"
#include "system/network.h"
#include "system/filesys.h"
#include "lib/util/dlinklist.h"
#include "db_wrap.h"
+static bool later_db(const char *name)
+{
+ return (strstr(name, "notify") || strstr(name, "serverid"));
+}
/*
lock all databases
*/
-static int ctdb_lock_all_databases(struct ctdb_context *ctdb)
+static int ctdb_lock_all_databases(struct ctdb_context *ctdb, uint32_t priority)
{
struct ctdb_db_context *ctdb_db;
+ /* REMOVE later */
+ /* This double loop is for backward compatibility and deadlock
+ avoidance for old samba versions that not yet support
+ the set prio call.
+ This code shall be removed later
+ */
for (ctdb_db=ctdb->db_list;ctdb_db;ctdb_db=ctdb_db->next) {
+ if (ctdb_db->priority != priority) {
+ continue;
+ }
+ if (later_db(ctdb_db->db_name)) {
+ continue;
+ }
+ DEBUG(DEBUG_INFO,("locking database 0x%08x priority:%u %s\n", ctdb_db->db_id, ctdb_db->priority, ctdb_db->db_name));
if (tdb_lockall(ctdb_db->ltdb->tdb) != 0) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed to lock database %s\n", ctdb_db->db_name));
+ return -1;
+ }
+ }
+ for (ctdb_db=ctdb->db_list;ctdb_db;ctdb_db=ctdb_db->next) {
+ if (ctdb_db->priority != priority) {
+ continue;
+ }
+ if (!later_db(ctdb_db->db_name)) {
+ continue;
+ }
+ DEBUG(DEBUG_INFO,("locking database 0x%08x priority:%u %s\n", ctdb_db->db_id, ctdb_db->priority, ctdb_db->db_name));
+ if (tdb_lockall(ctdb_db->ltdb->tdb) != 0) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed to lock database %s\n", ctdb_db->db_name));
return -1;
}
}
struct ctdb_freeze_waiter *next, *prev;
struct ctdb_context *ctdb;
struct ctdb_req_control *c;
+ uint32_t priority;
int32_t status;
};
/* a handle to a freeze lock child process */
struct ctdb_freeze_handle {
struct ctdb_context *ctdb;
+ uint32_t priority;
pid_t child;
int fd;
struct ctdb_freeze_waiter *waiters;
- bool transaction_started;
- uint32_t transaction_id;
};
/*
*/
static int ctdb_freeze_handle_destructor(struct ctdb_freeze_handle *h)
{
- h->ctdb->freeze_mode = CTDB_FREEZE_NONE;
+ struct ctdb_context *ctdb = h->ctdb;
+ struct ctdb_db_context *ctdb_db;
+
+ DEBUG(DEBUG_ERR,("Release freeze handler for prio %u\n", h->priority));
+
+ /* cancel any pending transactions */
+ if (ctdb->freeze_transaction_started) {
+ for (ctdb_db=ctdb->db_list;ctdb_db;ctdb_db=ctdb_db->next) {
+ if (ctdb_db->priority != h->priority) {
+ continue;
+ }
+ tdb_add_flags(ctdb_db->ltdb->tdb, TDB_NOLOCK);
+ if (tdb_transaction_cancel(ctdb_db->ltdb->tdb) != 0) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed to cancel transaction for db '%s'\n",
+ ctdb_db->db_name));
+ }
+ tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_NOLOCK);
+ }
+ ctdb->freeze_transaction_started = false;
+ }
+
+ ctdb->freeze_mode[h->priority] = CTDB_FREEZE_NONE;
+ ctdb->freeze_handles[h->priority] = NULL;
+
kill(h->child, SIGKILL);
- waitpid(h->child, NULL, 0);
return 0;
}
int32_t status;
struct ctdb_freeze_waiter *w;
- if (h->ctdb->freeze_mode == CTDB_FREEZE_FROZEN) {
+ if (h->ctdb->freeze_mode[h->priority] == CTDB_FREEZE_FROZEN) {
DEBUG(DEBUG_INFO,("freeze child died - unfreezing\n"));
talloc_free(h);
return;
return;
}
- h->ctdb->freeze_mode = CTDB_FREEZE_FROZEN;
+ h->ctdb->freeze_mode[h->priority] = CTDB_FREEZE_FROZEN;
/* notify the waiters */
- while ((w = h->ctdb->freeze_handle->waiters)) {
+ if (h != h->ctdb->freeze_handles[h->priority]) {
+ DEBUG(DEBUG_ERR,("lockwait finished but h is not linked\n"));
+ }
+ while ((w = h->waiters)) {
w->status = status;
- DLIST_REMOVE(h->ctdb->freeze_handle->waiters, w);
+ DLIST_REMOVE(h->waiters, w);
talloc_free(w);
}
}
create a child which gets locks on all the open databases, then calls the callback telling the parent
that it is done
*/
-static struct ctdb_freeze_handle *ctdb_freeze_lock(struct ctdb_context *ctdb)
+static struct ctdb_freeze_handle *ctdb_freeze_lock(struct ctdb_context *ctdb, uint32_t priority)
{
struct ctdb_freeze_handle *h;
int fd[2];
struct fd_event *fde;
h = talloc_zero(ctdb, struct ctdb_freeze_handle);
- CTDB_NO_MEMORY_VOID(ctdb, h);
+ CTDB_NO_MEMORY_NULL(ctdb, h);
- h->ctdb = ctdb;
+ h->ctdb = ctdb;
+ h->priority = priority;
- /* use socketpair() instead of pipe() so we have bi-directional fds */
- if (socketpair(AF_UNIX, SOCK_STREAM, 0, fd) != 0) {
+ if (pipe(fd) == -1) {
DEBUG(DEBUG_ERR,("Failed to create pipe for ctdb_freeze_lock\n"));
talloc_free(h);
return NULL;
/* in the child */
close(fd[0]);
- ret = ctdb_lock_all_databases(ctdb);
+
+ debug_extra = talloc_asprintf(NULL, "freeze_lock-%u:", priority);
+ ret = ctdb_lock_all_databases(ctdb, priority);
if (ret != 0) {
_exit(0);
}
-try_again:
ret = write(fd[1], &ret, sizeof(ret));
if (ret != sizeof(ret)) {
DEBUG(DEBUG_ERR, (__location__ " Failed to write to socket from freeze child. ret:%d errno:%u\n", ret, errno));
- sleep (1);
- goto try_again;
+ _exit(1);
}
- /* the read here means we will die if the parent exits */
- read(fd[1], &ret, sizeof(ret));
- _exit(0);
+ while (1) {
+ sleep(1);
+ if (kill(ctdb->ctdbd_pid, 0) != 0) {
+ DEBUG(DEBUG_ERR,("Parent died. Exiting lock wait child\n"));
+
+ _exit(0);
+ }
+ }
}
talloc_set_destructor(h, ctdb_freeze_handle_destructor);
close(fd[1]);
+ set_close_on_exec(fd[0]);
h->fd = fd[0];
- fde = event_add_fd(ctdb->ev, h, h->fd, EVENT_FD_READ|EVENT_FD_AUTOCLOSE,
+
+ fde = event_add_fd(ctdb->ev, h, h->fd, EVENT_FD_READ,
ctdb_freeze_lock_handler, h);
if (fde == NULL) {
DEBUG(DEBUG_ERR,("Failed to setup fd event for ctdb_freeze_lock\n"));
talloc_free(h);
return NULL;
}
+ tevent_fd_set_auto_close(fde);
return h;
}
*/
static int ctdb_freeze_waiter_destructor(struct ctdb_freeze_waiter *w)
{
- DLIST_REMOVE(w->ctdb->freeze_handle->waiters, w);
ctdb_request_control_reply(w->ctdb, w->c, NULL, w->status, NULL);
return 0;
}
/*
- start the freeze process
+ start the freeze process for a certain priority
*/
-void ctdb_start_freeze(struct ctdb_context *ctdb)
+int ctdb_start_freeze(struct ctdb_context *ctdb, uint32_t priority)
{
- if (ctdb->freeze_mode == CTDB_FREEZE_FROZEN) {
+ if (priority == 0) {
+ DEBUG(DEBUG_ERR,("Freeze priority 0 requested, remapping to priority 1\n"));
+ priority = 1;
+ }
+
+ if ((priority < 1) || (priority > NUM_DB_PRIORITIES)) {
+ DEBUG(DEBUG_ERR,(__location__ " Invalid db priority : %u\n", priority));
+ return -1;
+ }
+
+ if (ctdb->freeze_mode[priority] == CTDB_FREEZE_FROZEN) {
/* we're already frozen */
- return;
+ return 0;
}
+ /* Stop any vacuuming going on: we don't want to wait. */
+ ctdb_stop_vacuuming(ctdb);
+
/* if there isn't a freeze lock child then create one */
- if (!ctdb->freeze_handle) {
- ctdb->freeze_handle = ctdb_freeze_lock(ctdb);
- CTDB_NO_MEMORY_VOID(ctdb, ctdb->freeze_handle);
- ctdb->freeze_mode = CTDB_FREEZE_PENDING;
+ if (ctdb->freeze_handles[priority] == NULL) {
+ ctdb->freeze_handles[priority] = ctdb_freeze_lock(ctdb, priority);
+ CTDB_NO_MEMORY(ctdb, ctdb->freeze_handles[priority]);
+ ctdb->freeze_mode[priority] = CTDB_FREEZE_PENDING;
}
+
+ return 0;
}
/*
int32_t ctdb_control_freeze(struct ctdb_context *ctdb, struct ctdb_req_control *c, bool *async_reply)
{
struct ctdb_freeze_waiter *w;
+ uint32_t priority;
- if (ctdb->freeze_mode == CTDB_FREEZE_FROZEN) {
+ priority = (uint32_t)c->srvid;
+
+ DEBUG(DEBUG_ERR, ("Freeze priority %u\n", priority));
+
+ if (priority == 0) {
+ DEBUG(DEBUG_ERR,("Freeze priority 0 requested, remapping to priority 1\n"));
+ priority = 1;
+ }
+
+ if ((priority < 1) || (priority > NUM_DB_PRIORITIES)) {
+ DEBUG(DEBUG_ERR,(__location__ " Invalid db priority : %u\n", priority));
+ return -1;
+ }
+
+ if (ctdb->freeze_mode[priority] == CTDB_FREEZE_FROZEN) {
/* we're already frozen */
return 0;
}
- ctdb_start_freeze(ctdb);
+ if (ctdb_start_freeze(ctdb, priority) != 0) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed to start freezing databases with priority %u\n", priority));
+ return -1;
+ }
/* add ourselves to list of waiters */
- w = talloc(ctdb->freeze_handle, struct ctdb_freeze_waiter);
+ if (ctdb->freeze_handles[priority] == NULL) {
+ DEBUG(DEBUG_ERR,("No freeze lock handle when adding a waiter\n"));
+ return -1;
+ }
+
+ w = talloc(ctdb->freeze_handles[priority], struct ctdb_freeze_waiter);
CTDB_NO_MEMORY(ctdb, w);
- w->ctdb = ctdb;
- w->c = talloc_steal(w, c);
- w->status = -1;
+ w->ctdb = ctdb;
+ w->c = talloc_steal(w, c);
+ w->priority = priority;
+ w->status = -1;
talloc_set_destructor(w, ctdb_freeze_waiter_destructor);
- DLIST_ADD(ctdb->freeze_handle->waiters, w);
+ DLIST_ADD(ctdb->freeze_handles[priority]->waiters, w);
/* we won't reply till later */
*async_reply = True;
*/
bool ctdb_blocking_freeze(struct ctdb_context *ctdb)
{
- ctdb_start_freeze(ctdb);
+ int i;
- /* block until frozen */
- while (ctdb->freeze_mode == CTDB_FREEZE_PENDING) {
- event_loop_once(ctdb->ev);
+ for (i=1; i<=NUM_DB_PRIORITIES; i++) {
+ if (ctdb_start_freeze(ctdb, i)) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed to freeze databases of prio %u\n", i));
+ continue;
+ }
+
+ /* block until frozen */
+ while (ctdb->freeze_mode[i] == CTDB_FREEZE_PENDING) {
+ event_loop_once(ctdb->ev);
+ }
}
- return ctdb->freeze_mode == CTDB_FREEZE_FROZEN;
+ return 0;
}
-
-/*
- thaw the databases
- */
-int32_t ctdb_control_thaw(struct ctdb_context *ctdb)
+static void thaw_priority(struct ctdb_context *ctdb, uint32_t priority)
{
+ DEBUG(DEBUG_ERR,("Thawing priority %u\n", priority));
+
/* cancel any pending transactions */
- if (ctdb->freeze_handle && ctdb->freeze_handle->transaction_started) {
+ if (ctdb->freeze_transaction_started) {
struct ctdb_db_context *ctdb_db;
for (ctdb_db=ctdb->db_list;ctdb_db;ctdb_db=ctdb_db->next) {
tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_NOLOCK);
}
}
+ ctdb->freeze_transaction_started = false;
#if 0
/* this hack can be used to get a copy of the databases at the end of a recovery */
system("mkdir -p test.db.saved; /usr/bin/rsync --delete -a test.db/ test.db.saved/$$ 2>&1 > /dev/null");
#endif
+ if (ctdb->freeze_handles[priority] != NULL) {
+ talloc_free(ctdb->freeze_handles[priority]);
+ ctdb->freeze_handles[priority] = NULL;
+ }
+}
+
+/*
+ thaw the databases
+ */
+int32_t ctdb_control_thaw(struct ctdb_context *ctdb, uint32_t priority)
+{
+
+ if (priority > NUM_DB_PRIORITIES) {
+ DEBUG(DEBUG_ERR,(__location__ " Invalid db priority : %u\n", priority));
+ return -1;
+ }
+
+ if (priority == 0) {
+ int i;
+ for (i=1;i<=NUM_DB_PRIORITIES; i++) {
+ thaw_priority(ctdb, i);
+ }
+ } else {
+ thaw_priority(ctdb, priority);
+ }
- talloc_free(ctdb->freeze_handle);
- ctdb->freeze_handle = NULL;
ctdb_call_resend_all(ctdb);
return 0;
}
int32_t ctdb_control_transaction_start(struct ctdb_context *ctdb, uint32_t id)
{
struct ctdb_db_context *ctdb_db;
+ int i;
- if (ctdb->freeze_mode != CTDB_FREEZE_FROZEN) {
- DEBUG(DEBUG_ERR,(__location__ " Failed transaction_start while not frozen\n"));
- return -1;
+ for (i=1;i<=NUM_DB_PRIORITIES; i++) {
+ if (ctdb->freeze_mode[i] != CTDB_FREEZE_FROZEN) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed transaction_start while not frozen\n"));
+ return -1;
+ }
}
-
for (ctdb_db=ctdb->db_list;ctdb_db;ctdb_db=ctdb_db->next) {
int ret;
tdb_add_flags(ctdb_db->ltdb->tdb, TDB_NOLOCK);
- if (ctdb->freeze_handle->transaction_started) {
+ if (ctdb->freeze_transaction_started) {
if (tdb_transaction_cancel(ctdb_db->ltdb->tdb) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to cancel transaction for db '%s'\n",
ctdb_db->db_name));
}
}
- ctdb->freeze_handle->transaction_started = true;
- ctdb->freeze_handle->transaction_id = id;
+ ctdb->freeze_transaction_started = true;
+ ctdb->freeze_transaction_id = id;
+
+ return 0;
+}
+
+/*
+ cancel a transaction for all databases - used for recovery
+ */
+int32_t ctdb_control_transaction_cancel(struct ctdb_context *ctdb)
+{
+ struct ctdb_db_context *ctdb_db;
+
+ DEBUG(DEBUG_ERR,(__location__ " recovery transaction cancelled called\n"));
+
+ for (ctdb_db=ctdb->db_list;ctdb_db;ctdb_db=ctdb_db->next) {
+ tdb_add_flags(ctdb_db->ltdb->tdb, TDB_NOLOCK);
+
+ if (tdb_transaction_cancel(ctdb_db->ltdb->tdb) != 0) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed to cancel transaction for db '%s'\n", ctdb_db->db_name));
+ /* not a fatal error */
+ }
+
+ tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_NOLOCK);
+ }
+
+ ctdb->freeze_transaction_started = false;
return 0;
}
int32_t ctdb_control_transaction_commit(struct ctdb_context *ctdb, uint32_t id)
{
struct ctdb_db_context *ctdb_db;
+ int i;
+ int healthy_nodes = 0;
- if (ctdb->freeze_mode != CTDB_FREEZE_FROZEN) {
- DEBUG(DEBUG_ERR,(__location__ " Failed transaction_start while not frozen\n"));
- return -1;
+ for (i=1;i<=NUM_DB_PRIORITIES; i++) {
+ if (ctdb->freeze_mode[i] != CTDB_FREEZE_FROZEN) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed transaction_start while not frozen\n"));
+ return -1;
+ }
}
- if (!ctdb->freeze_handle->transaction_started) {
+ if (!ctdb->freeze_transaction_started) {
DEBUG(DEBUG_ERR,(__location__ " transaction not started\n"));
return -1;
}
- if (id != ctdb->freeze_handle->transaction_id) {
+ if (id != ctdb->freeze_transaction_id) {
DEBUG(DEBUG_ERR,(__location__ " incorrect transaction id 0x%x in commit\n", id));
return -1;
}
+ DEBUG(DEBUG_DEBUG,(__location__ " num_nodes[%d]\n", ctdb->num_nodes));
+ for (i=0; i < ctdb->num_nodes; i++) {
+ DEBUG(DEBUG_DEBUG,(__location__ " node[%d].flags[0x%X]\n",
+ i, ctdb->nodes[i]->flags));
+ if (ctdb->nodes[i]->flags == 0) {
+ healthy_nodes++;
+ }
+ }
+ DEBUG(DEBUG_INFO,(__location__ " healthy_nodes[%d]\n", healthy_nodes));
+
for (ctdb_db=ctdb->db_list;ctdb_db;ctdb_db=ctdb_db->next) {
+ int ret;
+
tdb_add_flags(ctdb_db->ltdb->tdb, TDB_NOLOCK);
- if (tdb_transaction_commit(ctdb_db->ltdb->tdb) != 0) {
- DEBUG(DEBUG_ERR,(__location__ " Failed to commit transaction for db '%s'\n",
+ ret = tdb_transaction_commit(ctdb_db->ltdb->tdb);
+ if (ret != 0) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed to commit transaction for db '%s'. Cancel all transactions and resetting transaction_started to false.\n",
ctdb_db->db_name));
- /* this has to be fatal to maintain integrity - it should only
- happen if we run out of disk space */
- ctdb_fatal(ctdb, "Unable to commit transactions\n");
- return -1;
+ goto fail;
}
tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_NOLOCK);
+
+ ret = ctdb_update_persistent_health(ctdb, ctdb_db, NULL, healthy_nodes);
+ if (ret != 0) {
+ DEBUG(DEBUG_CRIT,(__location__ " Failed to update persistent health for db '%s'. "
+ "Cancel all remaining transactions and resetting transaction_started to false.\n",
+ ctdb_db->db_name));
+ goto fail;
+ }
}
- ctdb->freeze_handle->transaction_started = false;
- ctdb->freeze_handle->transaction_id = 0;
+ ctdb->freeze_transaction_started = false;
+ ctdb->freeze_transaction_id = 0;
return 0;
+
+fail:
+ /* cancel any pending transactions */
+ for (ctdb_db=ctdb->db_list;ctdb_db;ctdb_db=ctdb_db->next) {
+ tdb_add_flags(ctdb_db->ltdb->tdb, TDB_NOLOCK);
+ if (tdb_transaction_cancel(ctdb_db->ltdb->tdb) != 0) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed to cancel transaction for db '%s'\n",
+ ctdb_db->db_name));
+ }
+ tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_NOLOCK);
+ }
+ ctdb->freeze_transaction_started = false;
+
+ return -1;
}
/*
struct ctdb_control_wipe_database w = *(struct ctdb_control_wipe_database *)indata.dptr;
struct ctdb_db_context *ctdb_db;
- if (ctdb->freeze_mode != CTDB_FREEZE_FROZEN) {
- DEBUG(DEBUG_ERR,(__location__ " Failed transaction_start while not frozen\n"));
+ ctdb_db = find_ctdb_db(ctdb, w.db_id);
+ if (!ctdb_db) {
+ DEBUG(DEBUG_ERR,(__location__ " Unknown db 0x%x\n", w.db_id));
return -1;
}
- if (!ctdb->freeze_handle->transaction_started) {
- DEBUG(DEBUG_ERR,(__location__ " transaction not started\n"));
+ if (ctdb->freeze_mode[ctdb_db->priority] != CTDB_FREEZE_FROZEN) {
+ DEBUG(DEBUG_ERR,(__location__ " Failed transaction_start while not frozen\n"));
return -1;
}
- if (w.transaction_id != ctdb->freeze_handle->transaction_id) {
- DEBUG(DEBUG_ERR,(__location__ " incorrect transaction id 0x%x in commit\n", w.transaction_id));
+ if (!ctdb->freeze_transaction_started) {
+ DEBUG(DEBUG_ERR,(__location__ " transaction not started\n"));
return -1;
}
- ctdb_db = find_ctdb_db(ctdb, w.db_id);
- if (!ctdb_db) {
- DEBUG(DEBUG_ERR,(__location__ " Unknown db 0x%x\n", w.db_id));
+ if (w.transaction_id != ctdb->freeze_transaction_id) {
+ DEBUG(DEBUG_ERR,(__location__ " incorrect transaction id 0x%x in commit\n", w.transaction_id));
return -1;
}
git.samba.org / sahlberg / ctdb.git / blobdiff