pcmk_sched_clone.c
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pcmk_sched_clone.c
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	/*
	* Copyright 2004-2024 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 <crm/common/xml.h>
	#include <pacemaker-internal.h>

	#include "libpacemaker_private.h"

	/*!
	* \internal
	* \brief Assign a clone resource's instances to nodes
	*
	* \param[in,out] rsc Clone resource to assign
	* \param[in] prefer Node to prefer, if all else is equal
	* \param[in] stop_if_fail If \c true and a primitive descendant of \p rsc
	* can't be assigned to a node, set the
	* descendant's next role to stopped and update
	* existing actions
	*
	* \return NULL (clones are not assigned to a single node)
	*
	* \note If \p stop_if_fail is \c false, then \c pcmk__unassign_resource() can
	* completely undo the assignment. A successful assignment can be either
	* undone or left alone as final. A failed assignment has the same effect
	* as calling pcmk__unassign_resource(); there are no side effects on
	* roles or actions.
	*/
	pcmk_node_t *
	pcmk__clone_assign(pcmk_resource_t rsc, const pcmk_node_t prefer,
	bool stop_if_fail)
	{
	GList *colocations = NULL;

	pcmk__assert(pcmk__is_clone(rsc));

	if (!pcmk_is_set(rsc->flags, pcmk_rsc_unassigned)) {
	return NULL; // Assignment has already been done
	}

	// Detect assignment loops
	if (pcmk_is_set(rsc->flags, pcmk_rsc_assigning)) {
	pcmk__rsc_debug(rsc, "Breaking assignment loop involving %s", rsc->id);
	return NULL;
	}
	pcmk__set_rsc_flags(rsc, pcmk_rsc_assigning);

	// If this clone is promotable, consider nodes' promotion scores
	if (pcmk_is_set(rsc->flags, pcmk_rsc_promotable)) {
	pcmk__add_promotion_scores(rsc);
	}

	// If this clone is colocated with any other resources, assign those first
	colocations = pcmk__this_with_colocations(rsc);
	for (GList *iter = colocations; iter != NULL; iter = iter->next) {
	pcmk__colocation_t constraint = (pcmk__colocation_t ) iter->data;

	pcmk__rsc_trace(rsc, "%s: Assigning colocation %s primary %s first",
	rsc->id, constraint->id, constraint->primary->id);
	constraint->primary->cmds->assign(constraint->primary, prefer,
	stop_if_fail);
	}
	g_list_free(colocations);

	// If any resources are colocated with this one, consider their preferences
	colocations = pcmk__with_this_colocations(rsc);
	g_list_foreach(colocations, pcmk__add_dependent_scores, rsc);
	g_list_free(colocations);

	pe__show_node_scores(!pcmk_is_set(rsc->cluster->flags,
	pcmk_sched_output_scores),
	rsc, __func__, rsc->allowed_nodes, rsc->cluster);

	rsc->children = g_list_sort(rsc->children, pcmk__cmp_instance);
	pcmk__assign_instances(rsc, rsc->children, pe__clone_max(rsc),
	pe__clone_node_max(rsc));

	if (pcmk_is_set(rsc->flags, pcmk_rsc_promotable)) {
	pcmk__set_instance_roles(rsc);
	}

	pcmk__clear_rsc_flags(rsc, pcmk_rsc_unassigned\|pcmk_rsc_assigning);
	pcmk__rsc_trace(rsc, "Assigned clone %s", rsc->id);
	return NULL;
	}

	/*!
	* \internal
	* \brief Create all actions needed for a given clone resource
	*
	* \param[in,out] rsc Clone resource to create actions for
	*/
	void
	pcmk__clone_create_actions(pcmk_resource_t *rsc)
	{
	pcmk__assert(pcmk__is_clone(rsc));

	pcmk__rsc_trace(rsc, "Creating actions for clone %s", rsc->id);
	pcmk__create_instance_actions(rsc, rsc->children);
	if (pcmk_is_set(rsc->flags, pcmk_rsc_promotable)) {
	pcmk__create_promotable_actions(rsc);
	}
	}

	/*!
	* \internal
	* \brief Create implicit constraints needed for a clone resource
	*
	* \param[in,out] rsc Clone resource to create implicit constraints for
	*/
	void
	pcmk__clone_internal_constraints(pcmk_resource_t *rsc)
	{
	bool ordered = false;

	pcmk__assert(pcmk__is_clone(rsc));

	pcmk__rsc_trace(rsc, "Creating internal constraints for clone %s", rsc->id);

	// Restart ordering: Stop -> stopped -> start -> started
	pcmk__order_resource_actions(rsc, PCMK_ACTION_STOPPED,
	rsc, PCMK_ACTION_START,
	pcmk__ar_ordered);
	pcmk__order_resource_actions(rsc, PCMK_ACTION_START,
	rsc, PCMK_ACTION_RUNNING,
	pcmk__ar_unrunnable_first_blocks);
	pcmk__order_resource_actions(rsc, PCMK_ACTION_STOP,
	rsc, PCMK_ACTION_STOPPED,
	pcmk__ar_unrunnable_first_blocks);

	// Demoted -> stop and started -> promote
	if (pcmk_is_set(rsc->flags, pcmk_rsc_promotable)) {
	pcmk__order_resource_actions(rsc, PCMK_ACTION_DEMOTED,
	rsc, PCMK_ACTION_STOP,
	pcmk__ar_ordered);
	pcmk__order_resource_actions(rsc, PCMK_ACTION_RUNNING,
	rsc, PCMK_ACTION_PROMOTE,
	pcmk__ar_unrunnable_first_blocks);
	}

	ordered = pe__clone_is_ordered(rsc);
	if (ordered) {
	/* Ordered clone instances must start and stop by instance number. The
	* instances might have been previously shuffled for assignment or
	* promotion purposes, so re-sort them.
	*/
	rsc->children = g_list_sort(rsc->children, pcmk__cmp_instance_number);
	}
	for (GList *iter = rsc->children; iter != NULL; iter = iter->next) {
	pcmk_resource_t instance = (pcmk_resource_t ) iter->data;

	instance->cmds->internal_constraints(instance);

	// Start clone -> start instance -> clone started
	pcmk__order_starts(rsc, instance, pcmk__ar_unrunnable_first_blocks
	\|pcmk__ar_then_implies_first_graphed);
	pcmk__order_resource_actions(instance, PCMK_ACTION_START,
	rsc, PCMK_ACTION_RUNNING,
	pcmk__ar_first_implies_then_graphed);

	// Stop clone -> stop instance -> clone stopped
	pcmk__order_stops(rsc, instance, pcmk__ar_then_implies_first_graphed);
	pcmk__order_resource_actions(instance, PCMK_ACTION_STOP,
	rsc, PCMK_ACTION_STOPPED,
	pcmk__ar_first_implies_then_graphed);

	/* Instances of ordered clones must be started and stopped by instance
	* number. Since only some instances may be starting or stopping, order
	* each instance relative to every later instance.
	*/
	if (ordered) {
	for (GList *later = iter->next;
	later != NULL; later = later->next) {
	pcmk__order_starts(instance, (pcmk_resource_t *) later->data,
	pcmk__ar_ordered);
	pcmk__order_stops((pcmk_resource_t *) later->data, instance,
	pcmk__ar_ordered);
	}
	}
	}
	if (pcmk_is_set(rsc->flags, pcmk_rsc_promotable)) {
	pcmk__order_promotable_instances(rsc);
	}
	}

	/*!
	* \internal
	* \brief Check whether colocated resources can be interleaved
	*
	* \param[in] colocation Colocation constraint with clone as primary
	*
	* \return true if colocated resources can be interleaved, otherwise false
	*/
	static bool
	can_interleave(const pcmk__colocation_t *colocation)
	{
	const pcmk_resource_t *dependent = colocation->dependent;

	// Only colocations between clone or bundle resources use interleaving
	if (dependent->variant <= pcmk_rsc_variant_group) {
	return false;
	}

	// Only the dependent needs to be marked for interleaving
	if (!crm_is_true(g_hash_table_lookup(dependent->meta,
	PCMK_META_INTERLEAVE))) {
	return false;
	}

	/* @TODO Do we actually care about multiple primary instances sharing a
	* dependent instance?
	*/
	if (dependent->fns->max_per_node(dependent)
	!= colocation->primary->fns->max_per_node(colocation->primary)) {
	pcmk__config_err("Cannot interleave %s and %s because they do not "
	"support the same number of instances per node",
	dependent->id, colocation->primary->id);
	return false;
	}

	return true;
	}

	/*!
	* \internal
	* \brief Apply a colocation's score to node scores or resource priority
	*
	* Given a colocation constraint, apply its score to the dependent's
	* allowed node scores (if we are still placing resources) or priority (if
	* we are choosing promotable clone instance roles).
	*
	* \param[in,out] dependent Dependent resource in colocation
	* \param[in] primary Primary resource in colocation
	* \param[in] colocation Colocation constraint to apply
	* \param[in] for_dependent true if called on behalf of dependent
	*
	* \return The score added to the dependent's priority
	*/
	int
	pcmk__clone_apply_coloc_score(pcmk_resource_t *dependent,
	const pcmk_resource_t *primary,
	const pcmk__colocation_t *colocation,
	bool for_dependent)
	{
	const GList *iter = NULL;
	int priority_delta = 0;

	/* This should never be called for the clone itself as a dependent. Instead,
	* we add its colocation constraints to its instances and call the
	* apply_coloc_score() method for the instances as dependents.
	*/
	pcmk__assert(!for_dependent && (colocation != NULL)
	&& pcmk__is_clone(primary) && pcmk__is_primitive(dependent));

	if (pcmk_is_set(primary->flags, pcmk_rsc_unassigned)) {
	pcmk__rsc_trace(primary,
	"Delaying processing colocation %s "
	"because cloned primary %s is still provisional",
	colocation->id, primary->id);
	return 0;
	}

	pcmk__rsc_trace(primary, "Processing colocation %s (%s with clone %s @%s)",
	colocation->id, dependent->id, primary->id,
	pcmk_readable_score(colocation->score));

	// Apply role-specific colocations
	if (pcmk_is_set(primary->flags, pcmk_rsc_promotable)
	&& (colocation->primary_role != pcmk_role_unknown)) {

	if (pcmk_is_set(dependent->flags, pcmk_rsc_unassigned)) {
	// We're assigning the dependent to a node
	pcmk__update_dependent_with_promotable(primary, dependent,
	colocation);
	return 0;
	}

	if (colocation->dependent_role == pcmk_role_promoted) {
	// We're choosing a role for the dependent
	return pcmk__update_promotable_dependent_priority(primary,
	dependent,
	colocation);
	}
	}

	// Apply interleaved colocations
	if (can_interleave(colocation)) {
	const pcmk_resource_t *primary_instance = NULL;

	primary_instance = pcmk__find_compatible_instance(dependent, primary,
	pcmk_role_unknown,
	false);
	if (primary_instance != NULL) {
	pcmk__rsc_debug(primary, "Interleaving %s with %s",
	dependent->id, primary_instance->id);

	return dependent->cmds->apply_coloc_score(dependent,
	primary_instance,
	colocation, true);
	}

	if (colocation->score >= PCMK_SCORE_INFINITY) {
	crm_notice("%s cannot run because it cannot interleave with "
	"any instance of %s", dependent->id, primary->id);
	pcmk__assign_resource(dependent, NULL, true, true);

	} else {
	pcmk__rsc_debug(primary,
	"%s will not colocate with %s "
	"because no instance can interleave with it",
	dependent->id, primary->id);
	}

	return 0;
	}

	// Apply mandatory colocations
	if (colocation->score >= PCMK_SCORE_INFINITY) {
	GList *primary_nodes = NULL;

	// Dependent can run only where primary will have unblocked instances
	for (iter = primary->children; iter != NULL; iter = iter->next) {
	const pcmk_resource_t *instance = iter->data;
	pcmk_node_t *chosen = instance->fns->location(instance, NULL, 0);

	if ((chosen != NULL)
	&& !is_set_recursive(instance, pcmk_rsc_blocked, TRUE)) {
	pcmk__rsc_trace(primary, "Allowing %s: %s %d",
	colocation->id, pcmk__node_name(chosen),
	chosen->weight);
	primary_nodes = g_list_prepend(primary_nodes, chosen);
	}
	}
	pcmk__colocation_intersect_nodes(dependent, primary, colocation,
	primary_nodes, false);
	g_list_free(primary_nodes);
	return 0;
	}

	// Apply optional colocations
	for (iter = primary->children; iter != NULL; iter = iter->next) {
	const pcmk_resource_t *instance = iter->data;
	int instance_delta = instance->cmds->apply_coloc_score(dependent,
	instance,
	colocation,
	false);

	priority_delta = pcmk__add_scores(priority_delta, instance_delta);
	}
	return priority_delta;
	}

	// Clone implementation of pcmk_assignment_methods_t:with_this_colocations()
	void
	pcmk__with_clone_colocations(const pcmk_resource_t *rsc,
	const pcmk_resource_t orig_rsc, GList *list)
	{
	CRM_CHECK((rsc != NULL) && (orig_rsc != NULL) && (list != NULL), return);

	pcmk__add_with_this_list(list, rsc->rsc_cons_lhs, orig_rsc);

	if (rsc->parent != NULL) {
	rsc->parent->cmds->with_this_colocations(rsc->parent, orig_rsc, list);
	}
	}

	// Clone implementation of pcmk_assignment_methods_t:this_with_colocations()
	void
	pcmk__clone_with_colocations(const pcmk_resource_t *rsc,
	const pcmk_resource_t orig_rsc, GList *list)
	{
	CRM_CHECK((rsc != NULL) && (orig_rsc != NULL) && (list != NULL), return);

	pcmk__add_this_with_list(list, rsc->rsc_cons, orig_rsc);

	if (rsc->parent != NULL) {
	rsc->parent->cmds->this_with_colocations(rsc->parent, orig_rsc, list);
	}
	}

	/*!
	* \internal
	* \brief Return action flags for a given clone resource action
	*
	* \param[in,out] action Action to get flags for
	* \param[in] node If not NULL, limit effects to this node
	*
	* \return Flags appropriate to \p action on \p node
	*/
	uint32_t
	pcmk__clone_action_flags(pcmk_action_t action, const pcmk_node_t node)
	{
	pcmk__assert((action != NULL) && pcmk__is_clone(action->rsc));

	return pcmk__collective_action_flags(action, action->rsc->children, node);
	}

	/*!
	* \internal
	* \brief Apply a location constraint to a clone resource's allowed node scores
	*
	* \param[in,out] rsc Clone resource to apply constraint to
	* \param[in,out] location Location constraint to apply
	*/
	void
	pcmk__clone_apply_location(pcmk_resource_t rsc, pcmk__location_t location)
	{
	CRM_CHECK((location != NULL) && pcmk__is_clone(rsc), return);

	pcmk__apply_location(rsc, location);

	for (GList *iter = rsc->children; iter != NULL; iter = iter->next) {
	pcmk_resource_t instance = (pcmk_resource_t ) iter->data;

	instance->cmds->apply_location(instance, location);
	}
	}

	// GFunc wrapper for calling the action_flags() resource method
	static void
	call_action_flags(gpointer data, gpointer user_data)
	{
	pcmk_resource_t *rsc = user_data;

	rsc->cmds->action_flags((pcmk_action_t *) data, NULL);
	}

	/*!
	* \internal
	* \brief Add a clone resource's actions to the transition graph
	*
	* \param[in,out] rsc Resource whose actions should be added
	*/
	void
	pcmk__clone_add_actions_to_graph(pcmk_resource_t *rsc)
	{
	pcmk__assert(pcmk__is_clone(rsc));

	g_list_foreach(rsc->actions, call_action_flags, rsc);
	pe__create_clone_notifications(rsc);

	for (GList *iter = rsc->children; iter != NULL; iter = iter->next) {
	pcmk_resource_t child_rsc = (pcmk_resource_t ) iter->data;

	child_rsc->cmds->add_actions_to_graph(child_rsc);
	}

	pcmk__add_rsc_actions_to_graph(rsc);
	pe__free_clone_notification_data(rsc);
	}

	/*!
	* \internal
	* \brief Check whether a resource or any children have been probed on a node
	*
	* \param[in] rsc Resource to check
	* \param[in] node Node to check
	*
	* \return true if \p node is in the known_on table of \p rsc or any of its
	* children, otherwise false
	*/
	static bool
	rsc_probed_on(const pcmk_resource_t rsc, const pcmk_node_t node)
	{
	if (rsc->children != NULL) {
	for (GList *child_iter = rsc->children; child_iter != NULL;
	child_iter = child_iter->next) {

	pcmk_resource_t child = (pcmk_resource_t ) child_iter->data;

	if (rsc_probed_on(child, node)) {
	return true;
	}
	}
	return false;
	}

	if (rsc->known_on != NULL) {
	GHashTableIter iter;
	pcmk_node_t *known_node = NULL;

	g_hash_table_iter_init(&iter, rsc->known_on);
	while (g_hash_table_iter_next(&iter, NULL, (gpointer *) &known_node)) {
	if (pcmk__same_node(node, known_node)) {
	return true;
	}
	}
	}
	return false;
	}

	/*!
	* \internal
	* \brief Find clone instance that has been probed on given node
	*
	* \param[in] clone Clone resource to check
	* \param[in] node Node to check
	*
	* \return Instance of \p clone that has been probed on \p node if any,
	* otherwise NULL
	*/
	static pcmk_resource_t *
	find_probed_instance_on(const pcmk_resource_t clone, const pcmk_node_t node)
	{
	for (GList *iter = clone->children; iter != NULL; iter = iter->next) {
	pcmk_resource_t instance = (pcmk_resource_t ) iter->data;

	if (rsc_probed_on(instance, node)) {
	return instance;
	}
	}
	return NULL;
	}

	/*!
	* \internal
	* \brief Probe an anonymous clone on a node
	*
	* \param[in,out] clone Anonymous clone to probe
	* \param[in,out] node Node to probe \p clone on
	*/
	static bool
	probe_anonymous_clone(pcmk_resource_t clone, pcmk_node_t node)
	{
	// Check whether we already probed an instance on this node
	pcmk_resource_t *child = find_probed_instance_on(clone, node);

	// Otherwise, check if we plan to start an instance on this node
	for (GList *iter = clone->children; (iter != NULL) && (child == NULL);
	iter = iter->next) {
	pcmk_resource_t instance = (pcmk_resource_t ) iter->data;
	const pcmk_node_t *instance_node = NULL;

	instance_node = instance->fns->location(instance, NULL, 0);
	if (pcmk__same_node(instance_node, node)) {
	child = instance;
	}
	}

	// Otherwise, use the first clone instance
	if (child == NULL) {
	child = clone->children->data;
	}

	// Anonymous clones only need to probe a single instance
	return child->cmds->create_probe(child, node);
	}

	/*!
	* \internal
	* \brief Schedule any probes needed for a resource on a node
	*
	* \param[in,out] rsc Resource to create probe for
	* \param[in,out] node Node to create probe on
	*
	* \return true if any probe was created, otherwise false
	*/
	bool
	pcmk__clone_create_probe(pcmk_resource_t rsc, pcmk_node_t node)
	{
	pcmk__assert((node != NULL) && pcmk__is_clone(rsc));

	if (rsc->exclusive_discover) {
	/* The clone is configured to be probed only where a location constraint
	* exists with PCMK_XA_RESOURCE_DISCOVERY set to exclusive.
	*
	* This check is not strictly necessary here since the instance's
	* create_probe() method would also check, but doing it here is more
	* efficient (especially for unique clones with a large number of
	* instances), and affects the CRM_meta_notify_available_uname variable
	* passed with notify actions.
	*/
	pcmk_node_t *allowed = g_hash_table_lookup(rsc->allowed_nodes,
	node->details->id);

	if ((allowed == NULL)
	\|\| (allowed->rsc_discover_mode != pcmk_probe_exclusive)) {
	/* This node is not marked for resource discovery. Remove it from
	* allowed_nodes so that notifications contain only nodes that the
	* clone can possibly run on.
	*/
	pcmk__rsc_trace(rsc,
	"Skipping probe for %s on %s because resource has "
	"exclusive discovery but is not allowed on node",
	rsc->id, pcmk__node_name(node));
	g_hash_table_remove(rsc->allowed_nodes, node->details->id);
	return false;
	}
	}

	rsc->children = g_list_sort(rsc->children, pcmk__cmp_instance_number);
	if (pcmk_is_set(rsc->flags, pcmk_rsc_unique)) {
	return pcmk__probe_resource_list(rsc->children, node);
	} else {
	return probe_anonymous_clone(rsc, node);
	}
	}

	/*!
	* \internal
	* \brief Add meta-attributes relevant to transition graph actions to XML
	*
	* Add clone-specific meta-attributes needed for transition graph actions.
	*
	* \param[in] rsc Clone resource whose meta-attributes should be added
	* \param[in,out] xml Transition graph action attributes XML to add to
	*/
	void
	pcmk__clone_add_graph_meta(const pcmk_resource_t rsc, xmlNode xml)
	{
	char *name = NULL;

	pcmk__assert(pcmk__is_clone(rsc) && (xml != NULL));

	name = crm_meta_name(PCMK_META_GLOBALLY_UNIQUE);
	crm_xml_add(xml, name, pcmk__flag_text(rsc->flags, pcmk_rsc_unique));
	free(name);

	name = crm_meta_name(PCMK_META_NOTIFY);
	crm_xml_add(xml, name, pcmk__flag_text(rsc->flags, pcmk_rsc_notify));
	free(name);

	name = crm_meta_name(PCMK_META_CLONE_MAX);
	crm_xml_add_int(xml, name, pe__clone_max(rsc));
	free(name);

	name = crm_meta_name(PCMK_META_CLONE_NODE_MAX);
	crm_xml_add_int(xml, name, pe__clone_node_max(rsc));
	free(name);

	if (pcmk_is_set(rsc->flags, pcmk_rsc_promotable)) {
	int promoted_max = pe__clone_promoted_max(rsc);
	int promoted_node_max = pe__clone_promoted_node_max(rsc);

	name = crm_meta_name(PCMK_META_PROMOTED_MAX);
	crm_xml_add_int(xml, name, promoted_max);
	free(name);

	name = crm_meta_name(PCMK_META_PROMOTED_NODE_MAX);
	crm_xml_add_int(xml, name, promoted_node_max);
	free(name);

	/* @COMPAT Maintain backward compatibility with resource agents that
	* expect the old names (deprecated since 2.0.0).
	*/
	name = crm_meta_name(PCMK__META_PROMOTED_MAX_LEGACY);
	crm_xml_add_int(xml, name, promoted_max);
	free(name);

	name = crm_meta_name(PCMK__META_PROMOTED_NODE_MAX_LEGACY);
	crm_xml_add_int(xml, name, promoted_node_max);
	free(name);
	}
	}

	// Clone implementation of pcmk_assignment_methods_t:add_utilization()
	void
	pcmk__clone_add_utilization(const pcmk_resource_t *rsc,
	const pcmk_resource_t orig_rsc, GList all_rscs,
	GHashTable *utilization)
	{
	bool existing = false;
	pcmk_resource_t *child = NULL;

	pcmk__assert(pcmk__is_clone(rsc) && (orig_rsc != NULL)
	&& (utilization != NULL));

	if (!pcmk_is_set(rsc->flags, pcmk_rsc_unassigned)) {
	return;
	}

	// Look for any child already existing in the list
	for (GList *iter = rsc->children; iter != NULL; iter = iter->next) {
	child = (pcmk_resource_t *) iter->data;
	if (g_list_find(all_rscs, child)) {
	existing = true; // Keep checking remaining children
	} else {
	// If this is a clone of a group, look for group's members
	for (GList *member_iter = child->children; member_iter != NULL;
	member_iter = member_iter->next) {

	pcmk_resource_t member = (pcmk_resource_t ) member_iter->data;

	if (g_list_find(all_rscs, member) != NULL) {
	// Add child's utilization, not group member's
	child->cmds->add_utilization(child, orig_rsc, all_rscs,
	utilization);
	existing = true;
	break;
	}
	}
	}
	}

	if (!existing && (rsc->children != NULL)) {
	// If nothing was found, still add first child's utilization
	child = (pcmk_resource_t *) rsc->children->data;

	child->cmds->add_utilization(child, orig_rsc, all_rscs, utilization);
	}
	}

	// Clone implementation of pcmk_assignment_methods_t:shutdown_lock()
	void
	pcmk__clone_shutdown_lock(pcmk_resource_t *rsc)
	{
	pcmk__assert(pcmk__is_clone(rsc));
	return; // Clones currently don't support shutdown locks
	}

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