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diff --git a/lib/pacemaker/pcmk_sched_probes.c b/lib/pacemaker/pcmk_sched_probes.c
index 9d4c5ac2fc..30471c6167 100644
--- a/lib/pacemaker/pcmk_sched_probes.c
+++ b/lib/pacemaker/pcmk_sched_probes.c
@@ -1,513 +1,504 @@
/*
* Copyright 2004-2021 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU General Public License version 2
* or later (GPLv2+) WITHOUT ANY WARRANTY.
*/
#include <crm_internal.h>
#include <glib.h>
#include <crm/crm.h>
#include <crm/pengine/status.h>
#include <pacemaker-internal.h>
#include "libpacemaker_private.h"
/*!
* \internal
* \brief Check whether a probe should be ordered before another action
*
* \param[in] probe Probe action to check
* \param[in] then Other action to check
*
* \return true if \p probe should be ordered before \p then, otherwise false
*/
static bool
probe_needed_before_action(pe_action_t *probe, pe_action_t *then)
{
// Probes on a node are performed after unfencing it, not before
if (pcmk__str_eq(then->task, CRM_OP_FENCE, pcmk__str_casei)
&& (probe->node != NULL) && (then->node != NULL)
&& (probe->node->details == then->node->details)) {
const char *op = g_hash_table_lookup(then->meta, "stonith_action");
if (pcmk__str_eq(op, "on", pcmk__str_casei)) {
return false;
}
}
// Probes should be done on a node before shutting it down
if (pcmk__str_eq(then->task, CRM_OP_SHUTDOWN, pcmk__str_none)
&& (probe->node != NULL) && (then->node != NULL)
&& (probe->node->details != then->node->details)) {
return false;
}
// Otherwise probes should always be done before any other action
return true;
}
/*!
* \internal
* \brief Add implicit "probe then X" orderings for "stop then X" orderings
*
* If the state of a resource is not known yet, a probe will be scheduled,
* expecting a "not running" result. If the probe fails, a stop will not be
* scheduled until the next transition. Thus, if there are ordering constraints
* like "stop this resource then do something else that's not for the same
* resource", add implicit "probe this resource then do something" equivalents
* so the relation is upheld until we know whether a stop is needed.
*
* \param[in] data_set Cluster working set
*/
static void
add_probe_orderings_for_stops(pe_working_set_t *data_set)
{
for (GList *iter = data_set->ordering_constraints; iter != NULL;
iter = iter->next) {
pe__ordering_t *order = iter->data;
enum pe_ordering order_type = pe_order_optional;
GList *probes = NULL;
GList *then_actions = NULL;
// Skip disabled orderings
if (order->type == pe_order_none) {
continue;
}
// Skip non-resource orderings, and orderings for the same resource
if ((order->lh_rsc == NULL) || (order->lh_rsc == order->rh_rsc)) {
continue;
}
// Skip invalid orderings (shouldn't be possible)
if (((order->lh_action == NULL) && (order->lh_action_task == NULL)) ||
((order->rh_action == NULL) && (order->rh_action_task == NULL))) {
continue;
}
// Skip orderings for first actions other than stop
if ((order->lh_action != NULL)
&& !pcmk__str_eq(order->lh_action->task, RSC_STOP, pcmk__str_none)) {
continue;
} else if ((order->lh_action == NULL)
&& !pcmk__ends_with(order->lh_action_task, "_" RSC_STOP "_0")) {
continue;
}
/* Do not imply a probe ordering for a resource inside of a stopping
* container. Otherwise, it might introduce a transition loop, since a
* probe could be scheduled after the container starts again.
*/
if ((order->rh_rsc != NULL)
&& (order->lh_rsc->container == order->rh_rsc)) {
if ((order->rh_action != NULL)
&& pcmk__str_eq(order->rh_action->task, RSC_STOP,
pcmk__str_none)) {
continue;
} else if ((order->rh_action == NULL)
&& pcmk__ends_with(order->rh_action_task,
"_" RSC_STOP "_0")) {
continue;
}
}
// Preserve certain order options for future filtering
if (pcmk_is_set(order->type, pe_order_apply_first_non_migratable)) {
pe__set_order_flags(order_type,
pe_order_apply_first_non_migratable);
}
if (pcmk_is_set(order->type, pe_order_same_node)) {
pe__set_order_flags(order_type, pe_order_same_node);
}
// Preserve certain order types for future filtering
if ((order->type == pe_order_anti_colocation)
|| (order->type == pe_order_load)) {
order_type = order->type;
}
// List all scheduled probes for the first resource
probes = pe__resource_actions(order->lh_rsc, NULL, RSC_STATUS, FALSE);
if (probes == NULL) { // There aren't any
continue;
}
// List all relevant "then" actions
if (order->rh_action != NULL) {
then_actions = g_list_prepend(NULL, order->rh_action);
} else if (order->rh_rsc != NULL) {
then_actions = find_actions(order->rh_rsc->actions,
order->rh_action_task, NULL);
if (then_actions == NULL) { // There aren't any
g_list_free(probes);
continue;
}
}
crm_trace("Implying 'probe then' orderings for '%s then %s' "
"(id=%d, type=%.6x)",
order->lh_action? order->lh_action->uuid : order->lh_action_task,
order->rh_action? order->rh_action->uuid : order->rh_action_task,
order->id, order->type);
for (GList *probe_iter = probes; probe_iter != NULL;
probe_iter = probe_iter->next) {
pe_action_t *probe = (pe_action_t *) probe_iter->data;
for (GList *then_iter = then_actions; then_iter != NULL;
then_iter = then_iter->next) {
pe_action_t *then = (pe_action_t *) then_iter->data;
if (probe_needed_before_action(probe, then)) {
order_actions(probe, then, order_type);
}
}
}
g_list_free(then_actions);
g_list_free(probes);
}
}
/*!
* \internal
* \brief Order probes before restarts and re-promotes
*
* If a given ordering is a "probe then start" or "probe then promote" ordering,
* add an implicit "probe then stop/demote" ordering in case the action is part
* of a restart/re-promote, and do the same recursively for all actions ordered
* after the "then" action.
*
* \param[in] probe Probe as 'first' action in an ordering
* \param[in] after 'then' action in the ordering
* \param[in] data_set Cluster working set
*/
static void
add_restart_orderings_for_probe(pe_action_t *probe, pe_action_t *after,
pe_working_set_t *data_set)
{
GList *iter = NULL;
bool interleave = false;
pe_resource_t *compatible_rsc = NULL;
// Validate that this is a resource probe followed by some action
if ((after == NULL) || (probe == NULL) || (probe->rsc == NULL)
|| (probe->rsc->variant != pe_native)
|| !pcmk__str_eq(probe->task, RSC_STATUS, pcmk__str_casei)) {
return;
}
// Avoid running into any possible loop
if (pcmk_is_set(after->flags, pe_action_tracking)) {
return;
}
pe__set_action_flags(after, pe_action_tracking);
crm_trace("Adding probe restart orderings for '%s@%s then %s@%s'",
probe->uuid,
((probe->node == NULL)? "" : probe->node->details->uname),
after->uuid,
((after->node == NULL)? "" : after->node->details->uname));
/* Add restart orderings if "then" is for a different primitive.
* Orderings for collective resources will be added later.
*/
if ((after->rsc != NULL) && (after->rsc->variant == pe_native)
&& (probe->rsc != after->rsc)) {
GList *then_actions = NULL;
if (pcmk__str_eq(after->task, RSC_START, pcmk__str_casei)) {
then_actions = pe__resource_actions(after->rsc, NULL, RSC_STOP,
FALSE);
} else if (pcmk__str_eq(after->task, RSC_PROMOTE, pcmk__str_casei)) {
then_actions = pe__resource_actions(after->rsc, NULL,
RSC_DEMOTE, FALSE);
}
for (iter = then_actions; iter != NULL; iter = iter->next) {
pe_action_t *then = (pe_action_t *) iter->data;
// Skip pseudo-actions (for example, those implied by fencing)
if (!pcmk_is_set(then->flags, pe_action_pseudo)) {
order_actions(probe, then, pe_order_optional);
}
}
g_list_free(then_actions);
}
/* Detect whether "then" is an interleaved clone action. For these, we want
* to add orderings only for the relevant instance.
*/
if ((after->rsc != NULL)
&& (after->rsc->variant > pe_group)) {
const char *interleave_s = g_hash_table_lookup(after->rsc->meta,
XML_RSC_ATTR_INTERLEAVE);
interleave = crm_is_true(interleave_s);
if (interleave) {
compatible_rsc = find_compatible_child(probe->rsc,
after->rsc,
RSC_ROLE_UNKNOWN,
FALSE, data_set);
}
}
/* Now recursively do the same for all actions ordered after "then". This
* also handles collective resources since the collective action will be
* ordered before its individual instances' actions.
*/
for (iter = after->actions_after; iter != NULL; iter = iter->next) {
pe_action_wrapper_t *after_wrapper = (pe_action_wrapper_t *) iter->data;
/* pe_order_implies_then is the reason why a required A.start
* implies/enforces B.start to be required too, which is the cause of
* B.restart/re-promote.
*
* Not sure about pe_order_implies_then_on_node though. It's now only
* used for unfencing case, which tends to introduce transition
* loops...
*/
if (!pcmk_is_set(after_wrapper->type, pe_order_implies_then)) {
/* The order type between a group/clone and its child such as
* B.start-> B_child.start is:
* pe_order_implies_first_printed | pe_order_runnable_left
*
* Proceed through the ordering chain and build dependencies with
* its children.
*/
if ((after->rsc == NULL)
|| (after->rsc->variant < pe_group)
|| (probe->rsc->parent == after->rsc)
|| (after_wrapper->action->rsc == NULL)
|| (after_wrapper->action->rsc->variant > pe_group)
|| (after->rsc != after_wrapper->action->rsc->parent)) {
continue;
}
/* Proceed to the children of a group or a non-interleaved clone.
* For an interleaved clone, proceed only to the relevant child.
*/
if ((after->rsc->variant > pe_group) && interleave
&& ((compatible_rsc == NULL)
|| (compatible_rsc != after_wrapper->action->rsc))) {
continue;
}
}
crm_trace("Recursively adding probe restart orderings for "
"'%s@%s then %s@%s' (type=%#.6x)",
after->uuid,
((after->node == NULL)? "" : after->node->details->uname),
after_wrapper->action->uuid,
((after_wrapper->action->node == NULL)? "" : after_wrapper->action->node->details->uname),
after_wrapper->type);
add_restart_orderings_for_probe(probe, after_wrapper->action, data_set);
}
}
/*!
* \internal
* \brief Clear the tracking flag on all scheduled actions
*
* \param[in] data_set Cluster working set
*/
static void
clear_actions_tracking_flag(pe_working_set_t *data_set)
{
GList *gIter = NULL;
for (gIter = data_set->actions; gIter != NULL; gIter = gIter->next) {
pe_action_t *action = (pe_action_t *) gIter->data;
pe__clear_action_flags(action, pe_action_tracking);
}
}
/*!
* \internal
* \brief Add restart orderings for any scheduled probes for a given resource
*
* \param[in] rsc Resource whose probes should be ordered
* \param[in] data_set Cluster working set
*/
static void
add_restart_orderings_for_rsc(pe_resource_t *rsc, pe_working_set_t *data_set)
{
GList *probes = NULL;
// For collective resources, order each instance recursively
if (rsc->variant != pe_native) {
g_list_foreach(rsc->children, (GFunc) add_restart_orderings_for_rsc,
data_set);
return;
}
// Find all probes for given resource
probes = pe__resource_actions(rsc, NULL, RSC_STATUS, FALSE);
// Add probe restart orderings for each probe found
for (GList *iter = probes; iter != NULL; iter= iter->next) {
pe_action_t *probe = (pe_action_t *) iter->data;
for (GList *then_iter = probe->actions_after; then_iter != NULL;
then_iter = then_iter->next) {
pe_action_wrapper_t *then = (pe_action_wrapper_t *) then_iter->data;
add_restart_orderings_for_probe(probe, then->action, data_set);
clear_actions_tracking_flag(data_set);
}
}
g_list_free(probes);
}
-static void
-order_first_probes(pe_working_set_t * data_set)
-{
- GList *gIter = NULL;
-
- for (gIter = data_set->resources; gIter != NULL; gIter = gIter->next) {
- pe_resource_t *rsc = (pe_resource_t *) gIter->data;
-
- add_restart_orderings_for_rsc(rsc, data_set);
- }
-
- add_probe_orderings_for_stops(data_set);
-}
-
static void
order_then_probes(pe_working_set_t * data_set)
{
#if 0
GList *gIter = NULL;
for (gIter = data_set->resources; gIter != NULL; gIter = gIter->next) {
pe_resource_t *rsc = (pe_resource_t *) gIter->data;
/* Given "A then B", we would prefer to wait for A to be
* started before probing B.
*
* If A was a filesystem on which the binaries and data for B
* lived, it would have been useful if the author of B's agent
* could assume that A is running before B.monitor will be
* called.
*
* However we can't _only_ probe once A is running, otherwise
* we'd not detect the state of B if A could not be started
* for some reason.
*
* In practice however, we cannot even do an opportunistic
* version of this because B may be moving:
*
* B.probe -> B.start
* B.probe -> B.stop
* B.stop -> B.start
* A.stop -> A.start
* A.start -> B.probe
*
* So far so good, but if we add the result of this code:
*
* B.stop -> A.stop
*
* Then we get a loop:
*
* B.probe -> B.stop -> A.stop -> A.start -> B.probe
*
* We could kill the 'B.probe -> B.stop' dependency, but that
* could mean stopping B "too" soon, because B.start must wait
* for the probes to complete.
*
* Another option is to allow it only if A is a non-unique
* clone with clone-max == node-max (since we'll never be
* moving it). However, we could still be stopping one
* instance at the same time as starting another.
* The complexity of checking for allowed conditions combined
* with the ever narrowing usecase suggests that this code
* should remain disabled until someone gets smarter.
*/
pe_action_t *start = NULL;
GList *actions = NULL;
GList *probes = NULL;
actions = pe__resource_actions(rsc, NULL, RSC_START, FALSE);
if (actions) {
start = actions->data;
g_list_free(actions);
}
if(start == NULL) {
crm_err("No start action for %s", rsc->id);
continue;
}
probes = pe__resource_actions(rsc, NULL, RSC_STATUS, FALSE);
for (actions = start->actions_before; actions != NULL; actions = actions->next) {
pe_action_wrapper_t *before = (pe_action_wrapper_t *) actions->data;
GList *pIter = NULL;
pe_action_t *first = before->action;
pe_resource_t *first_rsc = first->rsc;
if(first->required_runnable_before) {
GList *clone_actions = NULL;
for (clone_actions = first->actions_before; clone_actions != NULL; clone_actions = clone_actions->next) {
before = (pe_action_wrapper_t *) clone_actions->data;
crm_trace("Testing %s -> %s (%p) for %s", first->uuid, before->action->uuid, before->action->rsc, start->uuid);
CRM_ASSERT(before->action->rsc);
first_rsc = before->action->rsc;
break;
}
} else if(!pcmk__str_eq(first->task, RSC_START, pcmk__str_casei)) {
crm_trace("Not a start op %s for %s", first->uuid, start->uuid);
}
if(first_rsc == NULL) {
continue;
} else if(uber_parent(first_rsc) == uber_parent(start->rsc)) {
crm_trace("Same parent %s for %s", first_rsc->id, start->uuid);
continue;
} else if(FALSE && pe_rsc_is_clone(uber_parent(first_rsc)) == FALSE) {
crm_trace("Not a clone %s for %s", first_rsc->id, start->uuid);
continue;
}
crm_err("Applying %s before %s %d", first->uuid, start->uuid, uber_parent(first_rsc)->variant);
for (pIter = probes; pIter != NULL; pIter = pIter->next) {
pe_action_t *probe = (pe_action_t *) pIter->data;
crm_err("Ordering %s before %s", first->uuid, probe->uuid);
order_actions(first, probe, pe_order_optional);
}
}
}
#endif
}
void
pcmk__order_probes(pe_working_set_t *data_set)
{
- order_first_probes(data_set);
+ // Add orderings for "probe then X"
+ for (GList *iter = data_set->resources; iter != NULL; iter = iter->next) {
+ add_restart_orderings_for_rsc((pe_resource_t *) iter->data, data_set);
+ }
+ add_probe_orderings_for_stops(data_set);
+
order_then_probes(data_set);
}

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