pcmk_sched_primitive.c
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pcmk_sched_primitive.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 <stdbool.h>
	#include <stdint.h> // uint8_t, uint32_t

	#include <crm/msg_xml.h>
	#include <pacemaker-internal.h>

	#include "libpacemaker_private.h"

	static void stop_resource(pcmk_resource_t rsc, pcmk_node_t node,
	bool optional);
	static void start_resource(pcmk_resource_t rsc, pcmk_node_t node,
	bool optional);
	static void demote_resource(pcmk_resource_t rsc, pcmk_node_t node,
	bool optional);
	static void promote_resource(pcmk_resource_t rsc, pcmk_node_t node,
	bool optional);
	static void assert_role_error(pcmk_resource_t rsc, pcmk_node_t node,
	bool optional);

	#define RSC_ROLE_MAX (pcmk_role_promoted + 1)

	static enum rsc_role_e rsc_state_matrix[RSC_ROLE_MAX][RSC_ROLE_MAX] = {
	/* This array lists the immediate next role when transitioning from one role
	* to a target role. For example, when going from Stopped to Promoted, the
	* next role is Unpromoted, because the resource must be started before it
	* can be promoted. The current state then becomes Started, which is fed
	* into this array again, giving a next role of Promoted.
	*
	* Current role Immediate next role Final target role
	* ------------ ------------------- -----------------
	*/
	/* Unknown / { pcmk_role_unknown, / Unknown */
	pcmk_role_stopped, /* Stopped */
	pcmk_role_stopped, /* Started */
	pcmk_role_stopped, /* Unpromoted */
	pcmk_role_stopped, /* Promoted */
	},
	/* Stopped / { pcmk_role_stopped, / Unknown */
	pcmk_role_stopped, /* Stopped */
	pcmk_role_started, /* Started */
	pcmk_role_unpromoted, /* Unpromoted */
	pcmk_role_unpromoted, /* Promoted */
	},
	/* Started / { pcmk_role_stopped, / Unknown */
	pcmk_role_stopped, /* Stopped */
	pcmk_role_started, /* Started */
	pcmk_role_unpromoted, /* Unpromoted */
	pcmk_role_promoted, /* Promoted */
	},
	/* Unpromoted / { pcmk_role_stopped, / Unknown */
	pcmk_role_stopped, /* Stopped */
	pcmk_role_stopped, /* Started */
	pcmk_role_unpromoted, /* Unpromoted */
	pcmk_role_promoted, /* Promoted */
	},
	/* Promoted / { pcmk_role_stopped, / Unknown */
	pcmk_role_unpromoted, /* Stopped */
	pcmk_role_unpromoted, /* Started */
	pcmk_role_unpromoted, /* Unpromoted */
	pcmk_role_promoted, /* Promoted */
	},
	};

	/*!
	* \internal
	* \brief Function to schedule actions needed for a role change
	*
	* \param[in,out] rsc Resource whose role is changing
	* \param[in,out] node Node where resource will be in its next role
	* \param[in] optional Whether scheduled actions should be optional
	*/
	typedef void (rsc_transition_fn)(pcmk_resource_t rsc, pcmk_node_t *node,
	bool optional);

	static rsc_transition_fn rsc_action_matrix[RSC_ROLE_MAX][RSC_ROLE_MAX] = {
	/* This array lists the function needed to transition directly from one role
	* to another. NULL indicates that nothing is needed.
	*
	* Current role Transition function Next role
	* ------------ ------------------- ----------
	*/
	/* Unknown / { assert_role_error, / Unknown */
	stop_resource, /* Stopped */
	assert_role_error, /* Started */
	assert_role_error, /* Unpromoted */
	assert_role_error, /* Promoted */
	},
	/* Stopped / { assert_role_error, / Unknown */
	NULL, /* Stopped */
	start_resource, /* Started */
	start_resource, /* Unpromoted */
	assert_role_error, /* Promoted */
	},
	/* Started / { assert_role_error, / Unknown */
	stop_resource, /* Stopped */
	NULL, /* Started */
	NULL, /* Unpromoted */
	promote_resource, /* Promoted */
	},
	/* Unpromoted / { assert_role_error, / Unknown */
	stop_resource, /* Stopped */
	stop_resource, /* Started */
	NULL, /* Unpromoted */
	promote_resource, /* Promoted */
	},
	/* Promoted / { assert_role_error, / Unknown */
	demote_resource, /* Stopped */
	demote_resource, /* Started */
	demote_resource, /* Unpromoted */
	NULL, /* Promoted */
	},
	};

	/*!
	* \internal
	* \brief Get a list of a resource's allowed nodes sorted by node score
	*
	* \param[in] rsc Resource to check
	*
	* \return List of allowed nodes sorted by node score
	*/
	static GList *
	sorted_allowed_nodes(const pcmk_resource_t *rsc)
	{
	if (rsc->allowed_nodes != NULL) {
	GList *nodes = g_hash_table_get_values(rsc->allowed_nodes);

	if (nodes != NULL) {
	return pcmk__sort_nodes(nodes, pe__current_node(rsc));
	}
	}
	return NULL;
	}

	/*!
	* \internal
	* \brief Assign a resource to its best allowed node, if possible
	*
	* \param[in,out] rsc Resource to choose a node for
	* \param[in] prefer If not \c NULL, prefer this node when all else
	* equal
	* \param[in] stop_if_fail If \c true and \p rsc can't be assigned to a
	* node, set next role to stopped and update
	* existing actions
	*
	* \return true if \p rsc could be assigned to a node, otherwise false
	*
	* \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.
	*/
	static bool
	assign_best_node(pcmk_resource_t rsc, const pcmk_node_t prefer,
	bool stop_if_fail)
	{
	GList *nodes = NULL;
	pcmk_node_t *chosen = NULL;
	pcmk_node_t *best = NULL;
	const pcmk_node_t *most_free_node = pcmk__ban_insufficient_capacity(rsc);

	if (prefer == NULL) {
	prefer = most_free_node;
	}

	if (!pcmk_is_set(rsc->flags, pcmk_rsc_unassigned)) {
	// We've already finished assignment of resources to nodes
	return rsc->allocated_to != NULL;
	}

	// Sort allowed nodes by score
	nodes = sorted_allowed_nodes(rsc);
	if (nodes != NULL) {
	best = (pcmk_node_t *) nodes->data; // First node has best score
	}

	if ((prefer != NULL) && (nodes != NULL)) {
	// Get the allowed node version of prefer
	chosen = g_hash_table_lookup(rsc->allowed_nodes, prefer->details->id);

	if (chosen == NULL) {
	pcmk__rsc_trace(rsc, "Preferred node %s for %s was unknown",
	pe__node_name(prefer), rsc->id);

	/* Favor the preferred node as long as its score is at least as good as
	* the best allowed node's.
	*
	* An alternative would be to favor the preferred node even if the best
	* node is better, when the best node's score is less than INFINITY.
	*/
	} else if (chosen->weight < best->weight) {
	pcmk__rsc_trace(rsc, "Preferred node %s for %s was unsuitable",
	pe__node_name(chosen), rsc->id);
	chosen = NULL;

	} else if (!pcmk__node_available(chosen, true, false)) {
	pcmk__rsc_trace(rsc, "Preferred node %s for %s was unavailable",
	pe__node_name(chosen), rsc->id);
	chosen = NULL;

	} else {
	pcmk__rsc_trace(rsc,
	"Chose preferred node %s for %s "
	"(ignoring %d candidates)",
	pe__node_name(chosen), rsc->id,
	g_list_length(nodes));
	}
	}

	if ((chosen == NULL) && (best != NULL)) {
	/* Either there is no preferred node, or the preferred node is not
	* suitable, but another node is allowed to run the resource.
	*/

	chosen = best;

	if (!pe_rsc_is_unique_clone(rsc->parent)
	&& (chosen->weight > 0) // Zero not acceptable
	&& pcmk__node_available(chosen, false, false)) {
	/* If the resource is already running on a node, prefer that node if
	* it is just as good as the chosen node.
	*
	* We don't do this for unique clone instances, because
	* pcmk__assign_instances() has already assigned instances to their
	* running nodes when appropriate, and if we get here, we don't want
	* remaining unassigned instances to prefer a node that's already
	* running another instance.
	*/
	pcmk_node_t *running = pe__current_node(rsc);

	if (running == NULL) {
	// Nothing to do

	} else if (!pcmk__node_available(running, true, false)) {
	pcmk__rsc_trace(rsc,
	"Current node for %s (%s) can't run resources",
	rsc->id, pe__node_name(running));

	} else {
	int nodes_with_best_score = 1;

	for (GList *iter = nodes->next; iter; iter = iter->next) {
	pcmk_node_t allowed = (pcmk_node_t ) iter->data;

	if (allowed->weight != chosen->weight) {
	// The nodes are sorted by score, so no more are equal
	break;
	}
	if (pe__same_node(allowed, running)) {
	// Scores are equal, so prefer the current node
	chosen = allowed;
	}
	nodes_with_best_score++;
	}

	if (nodes_with_best_score > 1) {
	uint8_t log_level = LOG_INFO;

	if (chosen->weight >= INFINITY) {
	log_level = LOG_WARNING;
	}
	do_crm_log(log_level,
	"Chose %s for %s from %d nodes with score %s",
	pe__node_name(chosen), rsc->id,
	nodes_with_best_score,
	pcmk_readable_score(chosen->weight));
	}
	}
	}

	pcmk__rsc_trace(rsc, "Chose %s for %s from %d candidates",
	pe__node_name(chosen), rsc->id, g_list_length(nodes));
	}

	pcmk__assign_resource(rsc, chosen, false, stop_if_fail);
	g_list_free(nodes);
	return rsc->allocated_to != NULL;
	}

	/*!
	* \internal
	* \brief Apply a "this with" colocation to a node's allowed node scores
	*
	* \param[in,out] colocation Colocation to apply
	* \param[in,out] rsc Resource being assigned
	*/
	static void
	apply_this_with(pcmk__colocation_t colocation, pcmk_resource_t rsc)
	{
	GHashTable *archive = NULL;
	pcmk_resource_t *other = colocation->primary;

	// In certain cases, we will need to revert the node scores
	if ((colocation->dependent_role >= pcmk_role_promoted)
	\|\| ((colocation->score < 0) && (colocation->score > -INFINITY))) {
	archive = pcmk__copy_node_table(rsc->allowed_nodes);
	}

	if (pcmk_is_set(other->flags, pcmk_rsc_unassigned)) {
	pcmk__rsc_trace(rsc,
	"%s: Assigning colocation %s primary %s first"
	"(score=%d role=%s)",
	rsc->id, colocation->id, other->id,
	colocation->score, role2text(colocation->dependent_role));
	other->cmds->assign(other, NULL, true);
	}

	// Apply the colocation score to this resource's allowed node scores
	rsc->cmds->apply_coloc_score(rsc, other, colocation, true);
	if ((archive != NULL)
	&& !pcmk__any_node_available(rsc->allowed_nodes)) {
	pcmk__rsc_info(rsc,
	"%s: Reverting scores from colocation with %s "
	"because no nodes allowed",
	rsc->id, other->id);
	g_hash_table_destroy(rsc->allowed_nodes);
	rsc->allowed_nodes = archive;
	archive = NULL;
	}
	if (archive != NULL) {
	g_hash_table_destroy(archive);
	}
	}

	/*!
	* \internal
	* \brief Update a Pacemaker Remote node once its connection has been assigned
	*
	* \param[in] connection Connection resource that has been assigned
	*/
	static void
	remote_connection_assigned(const pcmk_resource_t *connection)
	{
	pcmk_node_t *remote_node = pe_find_node(connection->cluster->nodes,
	connection->id);

	CRM_CHECK(remote_node != NULL, return);

	if ((connection->allocated_to != NULL)
	&& (connection->next_role != pcmk_role_stopped)) {

	crm_trace("Pacemaker Remote node %s will be online",
	remote_node->details->id);
	remote_node->details->online = TRUE;
	if (remote_node->details->unseen) {
	// Avoid unnecessary fence, since we will attempt connection
	remote_node->details->unclean = FALSE;
	}

	} else {
	crm_trace("Pacemaker Remote node %s will be shut down "
	"(%sassigned connection's next role is %s)",
	remote_node->details->id,
	((connection->allocated_to == NULL)? "un" : ""),
	role2text(connection->next_role));
	remote_node->details->shutdown = TRUE;
	}
	}

	/*!
	* \internal
	* \brief Assign a primitive resource to a node
	*
	* \param[in,out] rsc Resource to assign to a node
	* \param[in] prefer Node to prefer, if all else is equal
	* \param[in] stop_if_fail If \c true and \p rsc can't be assigned to a
	* node, set next role to stopped and update
	* existing actions
	*
	* \return Node that \p rsc is assigned to, if assigned entirely to one 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__primitive_assign(pcmk_resource_t rsc, const pcmk_node_t prefer,
	bool stop_if_fail)
	{
	GList *this_with_colocations = NULL;
	GList *with_this_colocations = NULL;
	GList *iter = NULL;
	pcmk__colocation_t *colocation = NULL;

	CRM_ASSERT((rsc != NULL) && (rsc->variant == pcmk_rsc_variant_primitive));

	// Never assign a child without parent being assigned first
	if ((rsc->parent != NULL)
	&& !pcmk_is_set(rsc->parent->flags, pcmk_rsc_assigning)) {
	pcmk__rsc_debug(rsc, "%s: Assigning parent %s first",
	rsc->id, rsc->parent->id);
	rsc->parent->cmds->assign(rsc->parent, prefer, stop_if_fail);
	}

	if (!pcmk_is_set(rsc->flags, pcmk_rsc_unassigned)) {
	// Assignment has already been done
	const char *node_name = "no node";

	if (rsc->allocated_to != NULL) {
	node_name = pe__node_name(rsc->allocated_to);
	}
	pcmk__rsc_debug(rsc, "%s: pre-assigned to %s", rsc->id, node_name);
	return rsc->allocated_to;
	}

	// Ensure we 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);

	pe__show_node_scores(true, rsc, "Pre-assignment", rsc->allowed_nodes,
	rsc->cluster);

	this_with_colocations = pcmk__this_with_colocations(rsc);
	with_this_colocations = pcmk__with_this_colocations(rsc);

	// Apply mandatory colocations first, to satisfy as many as possible
	for (iter = this_with_colocations; iter != NULL; iter = iter->next) {
	colocation = iter->data;

	if ((colocation->score <= -CRM_SCORE_INFINITY)
	\|\| (colocation->score >= CRM_SCORE_INFINITY)) {
	apply_this_with(colocation, rsc);
	}
	}
	for (iter = with_this_colocations; iter != NULL; iter = iter->next) {
	colocation = iter->data;

	if ((colocation->score <= -CRM_SCORE_INFINITY)
	\|\| (colocation->score >= CRM_SCORE_INFINITY)) {
	pcmk__add_dependent_scores(colocation, rsc);
	}
	}

	pe__show_node_scores(true, rsc, "Mandatory-colocations",
	rsc->allowed_nodes, rsc->cluster);

	// Then apply optional colocations
	for (iter = this_with_colocations; iter != NULL; iter = iter->next) {
	colocation = iter->data;

	if ((colocation->score > -CRM_SCORE_INFINITY)
	&& (colocation->score < CRM_SCORE_INFINITY)) {
	apply_this_with(colocation, rsc);
	}
	}
	for (iter = with_this_colocations; iter != NULL; iter = iter->next) {
	colocation = iter->data;

	if ((colocation->score > -CRM_SCORE_INFINITY)
	&& (colocation->score < CRM_SCORE_INFINITY)) {
	pcmk__add_dependent_scores(colocation, rsc);
	}
	}

	g_list_free(this_with_colocations);
	g_list_free(with_this_colocations);

	if (rsc->next_role == pcmk_role_stopped) {
	pcmk__rsc_trace(rsc,
	"Banning %s from all nodes because it will be stopped",
	rsc->id);
	resource_location(rsc, NULL, -INFINITY, PCMK_META_TARGET_ROLE,
	rsc->cluster);

	} else if ((rsc->next_role > rsc->role)
	&& !pcmk_is_set(rsc->cluster->flags, pcmk_sched_quorate)
	&& (rsc->cluster->no_quorum_policy == pcmk_no_quorum_freeze)) {
	crm_notice("Resource %s cannot be elevated from %s to %s due to "
	PCMK_OPT_NO_QUORUM_POLICY "=freeze",
	rsc->id, role2text(rsc->role), role2text(rsc->next_role));
	pe__set_next_role(rsc, rsc->role, PCMK_OPT_NO_QUORUM_POLICY "=freeze");
	}

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

	// Unmanage resource if fencing is enabled but no device is configured
	if (pcmk_is_set(rsc->cluster->flags, pcmk_sched_fencing_enabled)
	&& !pcmk_is_set(rsc->cluster->flags, pcmk_sched_have_fencing)) {
	pcmk__clear_rsc_flags(rsc, pcmk_rsc_managed);
	}

	if (!pcmk_is_set(rsc->flags, pcmk_rsc_managed)) {
	// Unmanaged resources stay on their current node
	const char *reason = NULL;
	pcmk_node_t *assign_to = NULL;

	pe__set_next_role(rsc, rsc->role, "unmanaged");
	assign_to = pe__current_node(rsc);
	if (assign_to == NULL) {
	reason = "inactive";
	} else if (rsc->role == pcmk_role_promoted) {
	reason = "promoted";
	} else if (pcmk_is_set(rsc->flags, pcmk_rsc_failed)) {
	reason = "failed";
	} else {
	reason = "active";
	}
	pcmk__rsc_info(rsc, "Unmanaged resource %s assigned to %s: %s", rsc->id,
	(assign_to? assign_to->details->uname : "no node"),
	reason);
	pcmk__assign_resource(rsc, assign_to, true, stop_if_fail);

	} else if (pcmk_is_set(rsc->cluster->flags, pcmk_sched_stop_all)) {
	// Must stop at some point, but be consistent with stop_if_fail
	if (stop_if_fail) {
	pcmk__rsc_debug(rsc,
	"Forcing %s to stop: " PCMK_OPT_STOP_ALL_RESOURCES,
	rsc->id);
	}
	pcmk__assign_resource(rsc, NULL, true, stop_if_fail);

	} else if (!assign_best_node(rsc, prefer, stop_if_fail)) {
	// Assignment failed
	if (!pcmk_is_set(rsc->flags, pcmk_rsc_removed)) {
	pcmk__rsc_info(rsc, "Resource %s cannot run anywhere", rsc->id);
	} else if ((rsc->running_on != NULL) && stop_if_fail) {
	pcmk__rsc_info(rsc, "Stopping orphan resource %s", rsc->id);
	}
	}

	pcmk__clear_rsc_flags(rsc, pcmk_rsc_assigning);

	if (rsc->is_remote_node) {
	remote_connection_assigned(rsc);
	}

	return rsc->allocated_to;
	}

	/*!
	* \internal
	* \brief Schedule actions to bring resource down and back to current role
	*
	* \param[in,out] rsc Resource to restart
	* \param[in,out] current Node that resource should be brought down on
	* \param[in] need_stop Whether the resource must be stopped
	* \param[in] need_promote Whether the resource must be promoted
	*
	* \return Role that resource would have after scheduled actions are taken
	*/
	static void
	schedule_restart_actions(pcmk_resource_t rsc, pcmk_node_t current,
	bool need_stop, bool need_promote)
	{
	enum rsc_role_e role = rsc->role;
	enum rsc_role_e next_role;
	rsc_transition_fn fn = NULL;

	pcmk__set_rsc_flags(rsc, pcmk_rsc_restarting);

	// Bring resource down to a stop on its current node
	while (role != pcmk_role_stopped) {
	next_role = rsc_state_matrix[role][pcmk_role_stopped];
	pcmk__rsc_trace(rsc, "Creating %s action to take %s down from %s to %s",
	(need_stop? "required" : "optional"), rsc->id,
	role2text(role), role2text(next_role));
	fn = rsc_action_matrix[role][next_role];
	if (fn == NULL) {
	break;
	}
	fn(rsc, current, !need_stop);
	role = next_role;
	}

	// Bring resource up to its next role on its next node
	while ((rsc->role <= rsc->next_role) && (role != rsc->role)
	&& !pcmk_is_set(rsc->flags, pcmk_rsc_blocked)) {
	bool required = need_stop;

	next_role = rsc_state_matrix[role][rsc->role];
	if ((next_role == pcmk_role_promoted) && need_promote) {
	required = true;
	}
	pcmk__rsc_trace(rsc, "Creating %s action to take %s up from %s to %s",
	(required? "required" : "optional"), rsc->id,
	role2text(role), role2text(next_role));
	fn = rsc_action_matrix[role][next_role];
	if (fn == NULL) {
	break;
	}
	fn(rsc, rsc->allocated_to, !required);
	role = next_role;
	}

	pcmk__clear_rsc_flags(rsc, pcmk_rsc_restarting);
	}

	/*!
	* \internal
	* \brief If a resource's next role is not explicitly specified, set a default
	*
	* \param[in,out] rsc Resource to set next role for
	*
	* \return "explicit" if next role was explicitly set, otherwise "implicit"
	*/
	static const char *
	set_default_next_role(pcmk_resource_t *rsc)
	{
	if (rsc->next_role != pcmk_role_unknown) {
	return "explicit";
	}

	if (rsc->allocated_to == NULL) {
	pe__set_next_role(rsc, pcmk_role_stopped, "assignment");
	} else {
	pe__set_next_role(rsc, pcmk_role_started, "assignment");
	}
	return "implicit";
	}

	/*!
	* \internal
	* \brief Create an action to represent an already pending start
	*
	* \param[in,out] rsc Resource to create start action for
	*/
	static void
	create_pending_start(pcmk_resource_t *rsc)
	{
	pcmk_action_t *start = NULL;

	pcmk__rsc_trace(rsc,
	"Creating action for %s to represent already pending start",
	rsc->id);
	start = start_action(rsc, rsc->allocated_to, TRUE);
	pcmk__set_action_flags(start, pcmk_action_always_in_graph);
	}

	/*!
	* \internal
	* \brief Schedule actions needed to take a resource to its next role
	*
	* \param[in,out] rsc Resource to schedule actions for
	*/
	static void
	schedule_role_transition_actions(pcmk_resource_t *rsc)
	{
	enum rsc_role_e role = rsc->role;

	while (role != rsc->next_role) {
	enum rsc_role_e next_role = rsc_state_matrix[role][rsc->next_role];
	rsc_transition_fn fn = NULL;

	pcmk__rsc_trace(rsc,
	"Creating action to take %s from %s to %s "
	"(ending at %s)",
	rsc->id, role2text(role), role2text(next_role),
	role2text(rsc->next_role));
	fn = rsc_action_matrix[role][next_role];
	if (fn == NULL) {
	break;
	}
	fn(rsc, rsc->allocated_to, false);
	role = next_role;
	}
	}

	/*!
	* \internal
	* \brief Create all actions needed for a given primitive resource
	*
	* \param[in,out] rsc Primitive resource to create actions for
	*/
	void
	pcmk__primitive_create_actions(pcmk_resource_t *rsc)
	{
	bool need_stop = false;
	bool need_promote = false;
	bool is_moving = false;
	bool allow_migrate = false;
	bool multiply_active = false;

	pcmk_node_t *current = NULL;
	unsigned int num_all_active = 0;
	unsigned int num_clean_active = 0;
	const char *next_role_source = NULL;

	CRM_ASSERT((rsc != NULL) && (rsc->variant == pcmk_rsc_variant_primitive));

	next_role_source = set_default_next_role(rsc);
	pcmk__rsc_trace(rsc,
	"Creating all actions for %s transition from %s to %s "
	"(%s) on %s",
	rsc->id, role2text(rsc->role), role2text(rsc->next_role),
	next_role_source, pe__node_name(rsc->allocated_to));

	current = rsc->fns->active_node(rsc, &num_all_active, &num_clean_active);

	g_list_foreach(rsc->dangling_migrations, pcmk__abort_dangling_migration,
	rsc);

	if ((current != NULL) && (rsc->allocated_to != NULL)
	&& !pe__same_node(current, rsc->allocated_to)
	&& (rsc->next_role >= pcmk_role_started)) {

	pcmk__rsc_trace(rsc, "Moving %s from %s to %s",
	rsc->id, pe__node_name(current),
	pe__node_name(rsc->allocated_to));
	is_moving = true;
	allow_migrate = pcmk__rsc_can_migrate(rsc, current);

	// This is needed even if migrating (though I'm not sure why ...)
	need_stop = true;
	}

	// Check whether resource is partially migrated and/or multiply active
	if ((rsc->partial_migration_source != NULL)
	&& (rsc->partial_migration_target != NULL)
	&& allow_migrate && (num_all_active == 2)
	&& pe__same_node(current, rsc->partial_migration_source)
	&& pe__same_node(rsc->allocated_to, rsc->partial_migration_target)) {
	/* A partial migration is in progress, and the migration target remains
	* the same as when the migration began.
	*/
	pcmk__rsc_trace(rsc,
	"Partial migration of %s from %s to %s will continue",
	rsc->id, pe__node_name(rsc->partial_migration_source),
	pe__node_name(rsc->partial_migration_target));

	} else if ((rsc->partial_migration_source != NULL)
	\|\| (rsc->partial_migration_target != NULL)) {
	// A partial migration is in progress but can't be continued

	if (num_all_active > 2) {
	// The resource is migrating and multiply active!
	crm_notice("Forcing recovery of %s because it is migrating "
	"from %s to %s and possibly active elsewhere",
	rsc->id, pe__node_name(rsc->partial_migration_source),
	pe__node_name(rsc->partial_migration_target));
	} else {
	// The migration source or target isn't available
	crm_notice("Forcing recovery of %s because it can no longer "
	"migrate from %s to %s",
	rsc->id, pe__node_name(rsc->partial_migration_source),
	pe__node_name(rsc->partial_migration_target));
	}
	need_stop = true;
	rsc->partial_migration_source = rsc->partial_migration_target = NULL;
	allow_migrate = false;

	} else if (pcmk_is_set(rsc->flags, pcmk_rsc_needs_fencing)) {
	multiply_active = (num_all_active > 1);
	} else {
	/* If a resource has "requires" set to nothing or quorum, don't consider
	* it active on unclean nodes (similar to how all resources behave when
	* PCMK_OPT_STONITH_ENABLED is false). We can start such resources
	* elsewhere before fencing completes, and if we considered the resource
	* active on the failed node, we would attempt recovery for being active
	* on multiple nodes.
	*/
	multiply_active = (num_clean_active > 1);
	}

	if (multiply_active) {
	const char *class = crm_element_value(rsc->xml, XML_AGENT_ATTR_CLASS);

	// Resource was (possibly) incorrectly multiply active
	pcmk__sched_err("%s resource %s might be active on %u nodes (%s)",
	pcmk__s(class, "Untyped"), rsc->id, num_all_active,
	recovery2text(rsc->recovery_type));
	crm_notice("See https://wiki.clusterlabs.org/wiki/FAQ"
	"#Resource_is_Too_Active for more information");

	switch (rsc->recovery_type) {
	case pcmk_multiply_active_restart:
	need_stop = true;
	break;
	case pcmk_multiply_active_unexpected:
	need_stop = true; // stop_resource() will skip expected node
	pcmk__set_rsc_flags(rsc, pcmk_rsc_stop_unexpected);
	break;
	default:
	break;
	}

	} else {
	pcmk__clear_rsc_flags(rsc, pcmk_rsc_stop_unexpected);
	}

	if (pcmk_is_set(rsc->flags, pcmk_rsc_start_pending)) {
	create_pending_start(rsc);
	}

	if (is_moving) {
	// Remaining tests are only for resources staying where they are

	} else if (pcmk_is_set(rsc->flags, pcmk_rsc_failed)) {
	if (pcmk_is_set(rsc->flags, pcmk_rsc_stop_if_failed)) {
	need_stop = true;
	pcmk__rsc_trace(rsc, "Recovering %s", rsc->id);
	} else {
	pcmk__rsc_trace(rsc, "Recovering %s by demotion", rsc->id);
	if (rsc->next_role == pcmk_role_promoted) {
	need_promote = true;
	}
	}

	} else if (pcmk_is_set(rsc->flags, pcmk_rsc_blocked)) {
	pcmk__rsc_trace(rsc, "Blocking further actions on %s", rsc->id);
	need_stop = true;

	} else if ((rsc->role > pcmk_role_started) && (current != NULL)
	&& (rsc->allocated_to != NULL)) {
	pcmk_action_t *start = NULL;

	pcmk__rsc_trace(rsc, "Creating start action for promoted resource %s",
	rsc->id);
	start = start_action(rsc, rsc->allocated_to, TRUE);
	if (!pcmk_is_set(start->flags, pcmk_action_optional)) {
	// Recovery of a promoted resource
	pcmk__rsc_trace(rsc, "%s restart is required for recovery", rsc->id);
	need_stop = true;
	}
	}

	// Create any actions needed to bring resource down and back up to same role
	schedule_restart_actions(rsc, current, need_stop, need_promote);

	// Create any actions needed to take resource from this role to the next
	schedule_role_transition_actions(rsc);

	pcmk__create_recurring_actions(rsc);

	if (allow_migrate) {
	pcmk__create_migration_actions(rsc, current);
	}
	}

	/*!
	* \internal
	* \brief Ban a resource from any allowed nodes that are Pacemaker Remote nodes
	*
	* \param[in] rsc Resource to check
	*/
	static void
	rsc_avoids_remote_nodes(const pcmk_resource_t *rsc)
	{
	GHashTableIter iter;
	pcmk_node_t *node = NULL;

	g_hash_table_iter_init(&iter, rsc->allowed_nodes);
	while (g_hash_table_iter_next(&iter, NULL, (void **) &node)) {
	if (node->details->remote_rsc != NULL) {
	node->weight = -INFINITY;
	}
	}
	}

	/*!
	* \internal
	* \brief Return allowed nodes as (possibly sorted) list
	*
	* Convert a resource's hash table of allowed nodes to a list. If printing to
	* stdout, sort the list, to keep action ID numbers consistent for regression
	* test output (while avoiding the performance hit on a live cluster).
	*
	* \param[in] rsc Resource to check for allowed nodes
	*
	* \return List of resource's allowed nodes
	* \note Callers should take care not to rely on the list being sorted.
	*/
	static GList *
	allowed_nodes_as_list(const pcmk_resource_t *rsc)
	{
	GList *allowed_nodes = NULL;

	if (rsc->allowed_nodes) {
	allowed_nodes = g_hash_table_get_values(rsc->allowed_nodes);
	}

	if (!pcmk__is_daemon) {
	allowed_nodes = g_list_sort(allowed_nodes, pe__cmp_node_name);
	}

	return allowed_nodes;
	}

	/*!
	* \internal
	* \brief Create implicit constraints needed for a primitive resource
	*
	* \param[in,out] rsc Primitive resource to create implicit constraints for
	*/
	void
	pcmk__primitive_internal_constraints(pcmk_resource_t *rsc)
	{
	GList *allowed_nodes = NULL;
	bool check_unfencing = false;
	bool check_utilization = false;

	CRM_ASSERT((rsc != NULL) && (rsc->variant == pcmk_rsc_variant_primitive));

	if (!pcmk_is_set(rsc->flags, pcmk_rsc_managed)) {
	pcmk__rsc_trace(rsc,
	"Skipping implicit constraints for unmanaged resource "
	"%s", rsc->id);
	return;
	}

	// Whether resource requires unfencing
	check_unfencing = !pcmk_is_set(rsc->flags, pcmk_rsc_fence_device)
	&& pcmk_is_set(rsc->cluster->flags,
	pcmk_sched_enable_unfencing)
	&& pcmk_is_set(rsc->flags, pcmk_rsc_needs_unfencing);

	// Whether a non-default placement strategy is used
	check_utilization = (g_hash_table_size(rsc->utilization) > 0)
	&& !pcmk__str_eq(rsc->cluster->placement_strategy,
	"default", pcmk__str_casei);

	// Order stops before starts (i.e. restart)
	pcmk__new_ordering(rsc, pcmk__op_key(rsc->id, PCMK_ACTION_STOP, 0), NULL,
	rsc, pcmk__op_key(rsc->id, PCMK_ACTION_START, 0), NULL,
	pcmk__ar_ordered
	\|pcmk__ar_first_implies_then
	\|pcmk__ar_intermediate_stop,
	rsc->cluster);

	// Promotable ordering: demote before stop, start before promote
	if (pcmk_is_set(pe__const_top_resource(rsc, false)->flags,
	pcmk_rsc_promotable)
	\|\| (rsc->role > pcmk_role_unpromoted)) {

	pcmk__new_ordering(rsc, pcmk__op_key(rsc->id, PCMK_ACTION_DEMOTE, 0),
	NULL,
	rsc, pcmk__op_key(rsc->id, PCMK_ACTION_STOP, 0),
	NULL,
	pcmk__ar_promoted_then_implies_first, rsc->cluster);

	pcmk__new_ordering(rsc, pcmk__op_key(rsc->id, PCMK_ACTION_START, 0),
	NULL,
	rsc, pcmk__op_key(rsc->id, PCMK_ACTION_PROMOTE, 0),
	NULL,
	pcmk__ar_unrunnable_first_blocks, rsc->cluster);
	}

	// Don't clear resource history if probing on same node
	pcmk__new_ordering(rsc, pcmk__op_key(rsc->id, PCMK_ACTION_LRM_DELETE, 0),
	NULL, rsc,
	pcmk__op_key(rsc->id, PCMK_ACTION_MONITOR, 0),
	NULL,
	pcmk__ar_if_on_same_node\|pcmk__ar_then_cancels_first,
	rsc->cluster);

	// Certain checks need allowed nodes
	if (check_unfencing \|\| check_utilization \|\| (rsc->container != NULL)) {
	allowed_nodes = allowed_nodes_as_list(rsc);
	}

	if (check_unfencing) {
	g_list_foreach(allowed_nodes, pcmk__order_restart_vs_unfence, rsc);
	}

	if (check_utilization) {
	pcmk__create_utilization_constraints(rsc, allowed_nodes);
	}

	if (rsc->container != NULL) {
	pcmk_resource_t *remote_rsc = NULL;

	if (rsc->is_remote_node) {
	// rsc is the implicit remote connection for a guest or bundle node

	/* Guest resources are not allowed to run on Pacemaker Remote nodes,
	* to avoid nesting remotes. However, bundles are allowed.
	*/
	if (!pcmk_is_set(rsc->flags, pcmk_rsc_remote_nesting_allowed)) {
	rsc_avoids_remote_nodes(rsc->container);
	}

	/* If someone cleans up a guest or bundle node's container, we will
	* likely schedule a (re-)probe of the container and recovery of the
	* connection. Order the connection stop after the container probe,
	* so that if we detect the container running, we will trigger a new
	* transition and avoid the unnecessary recovery.
	*/
	pcmk__order_resource_actions(rsc->container, PCMK_ACTION_MONITOR,
	rsc, PCMK_ACTION_STOP,
	pcmk__ar_ordered);

	/* A user can specify that a resource must start on a Pacemaker Remote
	* node by explicitly configuring it with the container=NODENAME
	* meta-attribute. This is of questionable merit, since location
	* constraints can accomplish the same thing. But we support it, so here
	* we check whether a resource (that is not itself a remote connection)
	* has container set to a remote node or guest node resource.
	*/
	} else if (rsc->container->is_remote_node) {
	remote_rsc = rsc->container;
	} else {
	remote_rsc = pe__resource_contains_guest_node(rsc->cluster,
	rsc->container);
	}

	if (remote_rsc != NULL) {
	/* Force the resource on the Pacemaker Remote node instead of
	* colocating the resource with the container resource.
	*/
	for (GList *item = allowed_nodes; item; item = item->next) {
	pcmk_node_t *node = item->data;

	if (node->details->remote_rsc != remote_rsc) {
	node->weight = -INFINITY;
	}
	}

	} else {
	/* This resource is either a filler for a container that does NOT
	* represent a Pacemaker Remote node, or a Pacemaker Remote
	* connection resource for a guest node or bundle.
	*/
	int score;

	crm_trace("Order and colocate %s relative to its container %s",
	rsc->id, rsc->container->id);

	pcmk__new_ordering(rsc->container,
	pcmk__op_key(rsc->container->id,
	PCMK_ACTION_START, 0),
	NULL, rsc,
	pcmk__op_key(rsc->id, PCMK_ACTION_START, 0),
	NULL,
	pcmk__ar_first_implies_then
	\|pcmk__ar_unrunnable_first_blocks,
	rsc->cluster);

	pcmk__new_ordering(rsc,
	pcmk__op_key(rsc->id, PCMK_ACTION_STOP, 0),
	NULL,
	rsc->container,
	pcmk__op_key(rsc->container->id,
	PCMK_ACTION_STOP, 0),
	NULL, pcmk__ar_then_implies_first, rsc->cluster);

	if (pcmk_is_set(rsc->flags, pcmk_rsc_remote_nesting_allowed)) {
	score = 10000; /* Highly preferred but not essential */
	} else {
	score = INFINITY; /* Force them to run on the same host */
	}
	pcmk__new_colocation("#resource-with-container", NULL, score, rsc,
	rsc->container, NULL, NULL,
	pcmk__coloc_influence);
	}
	}

	if (rsc->is_remote_node
	\|\| pcmk_is_set(rsc->flags, pcmk_rsc_fence_device)) {
	/* Remote connections and fencing devices are not allowed to run on
	* Pacemaker Remote nodes
	*/
	rsc_avoids_remote_nodes(rsc);
	}
	g_list_free(allowed_nodes);
	}

	/*!
	* \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
	*/
	void
	pcmk__primitive_apply_coloc_score(pcmk_resource_t *dependent,
	const pcmk_resource_t *primary,
	const pcmk__colocation_t *colocation,
	bool for_dependent)
	{
	enum pcmk__coloc_affects filter_results;

	CRM_ASSERT((dependent != NULL) && (primary != NULL)
	&& (colocation != NULL));

	if (for_dependent) {
	// Always process on behalf of primary resource
	primary->cmds->apply_coloc_score(dependent, primary, colocation, false);
	return;
	}

	filter_results = pcmk__colocation_affects(dependent, primary, colocation,
	false);
	pcmk__rsc_trace(dependent, "%s %s with %s (%s, score=%d, filter=%d)",
	((colocation->score > 0)? "Colocating" : "Anti-colocating"),
	dependent->id, primary->id, colocation->id,
	colocation->score,
	filter_results);

	switch (filter_results) {
	case pcmk__coloc_affects_role:
	pcmk__apply_coloc_to_priority(dependent, primary, colocation);
	break;
	case pcmk__coloc_affects_location:
	pcmk__apply_coloc_to_scores(dependent, primary, colocation);
	break;
	default: // pcmk__coloc_affects_nothing
	return;
	}
	}

	/* Primitive implementation of
	* pcmk_assignment_methods_t:with_this_colocations()
	*/
	void
	pcmk__with_primitive_colocations(const pcmk_resource_t *rsc,
	const pcmk_resource_t orig_rsc, GList *list)
	{
	CRM_ASSERT((rsc != NULL) && (rsc->variant == pcmk_rsc_variant_primitive)
	&& (list != NULL));

	if (rsc == orig_rsc) {
	/* For the resource itself, add all of its own colocations and relevant
	* colocations from its parent (if any).
	*/
	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);
	}
	} else {
	// For an ancestor, add only explicitly configured constraints
	for (GList *iter = rsc->rsc_cons_lhs; iter != NULL; iter = iter->next) {
	pcmk__colocation_t *colocation = iter->data;

	if (pcmk_is_set(colocation->flags, pcmk__coloc_explicit)) {
	pcmk__add_with_this(list, colocation, orig_rsc);
	}
	}
	}
	}

	/* Primitive implementation of
	* pcmk_assignment_methods_t:this_with_colocations()
	*/
	void
	pcmk__primitive_with_colocations(const pcmk_resource_t *rsc,
	const pcmk_resource_t orig_rsc, GList *list)
	{
	CRM_ASSERT((rsc != NULL) && (rsc->variant == pcmk_rsc_variant_primitive)
	&& (list != NULL));

	if (rsc == orig_rsc) {
	/* For the resource itself, add all of its own colocations and relevant
	* colocations from its parent (if any).
	*/
	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);
	}
	} else {
	// For an ancestor, add only explicitly configured constraints
	for (GList *iter = rsc->rsc_cons; iter != NULL; iter = iter->next) {
	pcmk__colocation_t *colocation = iter->data;

	if (pcmk_is_set(colocation->flags, pcmk__coloc_explicit)) {
	pcmk__add_this_with(list, colocation, orig_rsc);
	}
	}
	}
	}

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

	/*!
	* \internal
	* \brief Check whether a node is a multiply active resource's expected node
	*
	* \param[in] rsc Resource to check
	* \param[in] node Node to check
	*
	* \return \c true if \p rsc is multiply active with
	* \c PCMK_META_MULTIPLE_ACTIVE set to \c stop_unexpected, and \p node
	* is the node where it will remain active
	* \note This assumes that the resource's next role cannot be changed to stopped
	* after this is called, which should be reasonable if status has already
	* been unpacked and resources have been assigned to nodes.
	*/
	static bool
	is_expected_node(const pcmk_resource_t rsc, const pcmk_node_t node)
	{
	return pcmk_all_flags_set(rsc->flags,
	pcmk_rsc_stop_unexpected\|pcmk_rsc_restarting)
	&& (rsc->next_role > pcmk_role_stopped)
	&& pe__same_node(rsc->allocated_to, node);
	}

	/*!
	* \internal
	* \brief Schedule actions needed to stop a resource wherever it is active
	*
	* \param[in,out] rsc Resource being stopped
	* \param[in] node Node where resource is being stopped (ignored)
	* \param[in] optional Whether actions should be optional
	*/
	static void
	stop_resource(pcmk_resource_t rsc, pcmk_node_t node, bool optional)
	{
	for (GList *iter = rsc->running_on; iter != NULL; iter = iter->next) {
	pcmk_node_t current = (pcmk_node_t ) iter->data;
	pcmk_action_t *stop = NULL;

	if (is_expected_node(rsc, current)) {
	/* We are scheduling restart actions for a multiply active resource
	* with PCMK_META_MULTIPLE_ACTIVE=stop_unexpected, and this is where
	* it should not be stopped.
	*/
	pcmk__rsc_trace(rsc,
	"Skipping stop of multiply active resource %s "
	"on expected node %s",
	rsc->id, pe__node_name(current));
	continue;
	}

	if (rsc->partial_migration_target != NULL) {
	// Continue migration if node originally was and remains target
	if (pe__same_node(current, rsc->partial_migration_target)
	&& pe__same_node(current, rsc->allocated_to)) {
	pcmk__rsc_trace(rsc,
	"Skipping stop of %s on %s "
	"because partial migration there will continue",
	rsc->id, pe__node_name(current));
	continue;
	} else {
	pcmk__rsc_trace(rsc,
	"Forcing stop of %s on %s "
	"because migration target changed",
	rsc->id, pe__node_name(current));
	optional = false;
	}
	}

	pcmk__rsc_trace(rsc, "Scheduling stop of %s on %s",
	rsc->id, pe__node_name(current));
	stop = stop_action(rsc, current, optional);

	if (rsc->allocated_to == NULL) {
	pe_action_set_reason(stop, "node availability", true);
	} else if (pcmk_all_flags_set(rsc->flags, pcmk_rsc_restarting
	\|pcmk_rsc_stop_unexpected)) {
	/* We are stopping a multiply active resource on a node that is
	* not its expected node, and we are still scheduling restart
	* actions, so the stop is for being multiply active.
	*/
	pe_action_set_reason(stop, "being multiply active", true);
	}

	if (!pcmk_is_set(rsc->flags, pcmk_rsc_managed)) {
	pcmk__clear_action_flags(stop, pcmk_action_runnable);
	}

	if (pcmk_is_set(rsc->cluster->flags, pcmk_sched_remove_after_stop)) {
	pcmk__schedule_cleanup(rsc, current, optional);
	}

	if (pcmk_is_set(rsc->flags, pcmk_rsc_needs_unfencing)) {
	pcmk_action_t *unfence = pe_fence_op(current, PCMK_ACTION_ON, true,
	NULL, false, rsc->cluster);

	order_actions(stop, unfence, pcmk__ar_then_implies_first);
	if (!pcmk__node_unfenced(current)) {
	pcmk__sched_err("Stopping %s until %s can be unfenced",
	rsc->id, pe__node_name(current));
	}
	}
	}
	}

	/*!
	* \internal
	* \brief Schedule actions needed to start a resource on a node
	*
	* \param[in,out] rsc Resource being started
	* \param[in,out] node Node where resource should be started
	* \param[in] optional Whether actions should be optional
	*/
	static void
	start_resource(pcmk_resource_t rsc, pcmk_node_t node, bool optional)
	{
	pcmk_action_t *start = NULL;

	CRM_ASSERT(node != NULL);

	pcmk__rsc_trace(rsc, "Scheduling %s start of %s on %s (score %d)",
	(optional? "optional" : "required"), rsc->id,
	pe__node_name(node), node->weight);
	start = start_action(rsc, node, TRUE);

	pcmk__order_vs_unfence(rsc, node, start, pcmk__ar_first_implies_then);

	if (pcmk_is_set(start->flags, pcmk_action_runnable) && !optional) {
	pcmk__clear_action_flags(start, pcmk_action_optional);
	}

	if (is_expected_node(rsc, node)) {
	/* This could be a problem if the start becomes necessary for other
	* reasons later.
	*/
	pcmk__rsc_trace(rsc,
	"Start of multiply active resouce %s "
	"on expected node %s will be a pseudo-action",
	rsc->id, pe__node_name(node));
	pcmk__set_action_flags(start, pcmk_action_pseudo);
	}
	}

	/*!
	* \internal
	* \brief Schedule actions needed to promote a resource on a node
	*
	* \param[in,out] rsc Resource being promoted
	* \param[in] node Node where resource should be promoted
	* \param[in] optional Whether actions should be optional
	*/
	static void
	promote_resource(pcmk_resource_t rsc, pcmk_node_t node, bool optional)
	{
	GList *iter = NULL;
	GList *action_list = NULL;
	bool runnable = true;

	CRM_ASSERT(node != NULL);

	// Any start must be runnable for promotion to be runnable
	action_list = pe__resource_actions(rsc, node, PCMK_ACTION_START, true);
	for (iter = action_list; iter != NULL; iter = iter->next) {
	pcmk_action_t start = (pcmk_action_t ) iter->data;

	if (!pcmk_is_set(start->flags, pcmk_action_runnable)) {
	runnable = false;
	}
	}
	g_list_free(action_list);

	if (runnable) {
	pcmk_action_t *promote = promote_action(rsc, node, optional);

	pcmk__rsc_trace(rsc, "Scheduling %s promotion of %s on %s",
	(optional? "optional" : "required"), rsc->id,
	pe__node_name(node));

	if (is_expected_node(rsc, node)) {
	/* This could be a problem if the promote becomes necessary for
	* other reasons later.
	*/
	pcmk__rsc_trace(rsc,
	"Promotion of multiply active resouce %s "
	"on expected node %s will be a pseudo-action",
	rsc->id, pe__node_name(node));
	pcmk__set_action_flags(promote, pcmk_action_pseudo);
	}
	} else {
	pcmk__rsc_trace(rsc, "Not promoting %s on %s: start unrunnable",
	rsc->id, pe__node_name(node));
	action_list = pe__resource_actions(rsc, node, PCMK_ACTION_PROMOTE,
	true);
	for (iter = action_list; iter != NULL; iter = iter->next) {
	pcmk_action_t promote = (pcmk_action_t ) iter->data;

	pcmk__clear_action_flags(promote, pcmk_action_runnable);
	}
	g_list_free(action_list);
	}
	}

	/*!
	* \internal
	* \brief Schedule actions needed to demote a resource wherever it is active
	*
	* \param[in,out] rsc Resource being demoted
	* \param[in] node Node where resource should be demoted (ignored)
	* \param[in] optional Whether actions should be optional
	*/
	static void
	demote_resource(pcmk_resource_t rsc, pcmk_node_t node, bool optional)
	{
	/* Since this will only be called for a primitive (possibly as an instance
	* of a collective resource), the resource is multiply active if it is
	* running on more than one node, so we want to demote on all of them as
	* part of recovery, regardless of which one is the desired node.
	*/
	for (GList *iter = rsc->running_on; iter != NULL; iter = iter->next) {
	pcmk_node_t current = (pcmk_node_t ) iter->data;

	if (is_expected_node(rsc, current)) {
	pcmk__rsc_trace(rsc,
	"Skipping demote of multiply active resource %s "
	"on expected node %s",
	rsc->id, pe__node_name(current));
	} else {
	pcmk__rsc_trace(rsc, "Scheduling %s demotion of %s on %s",
	(optional? "optional" : "required"), rsc->id,
	pe__node_name(current));
	demote_action(rsc, current, optional);
	}
	}
	}

	static void
	assert_role_error(pcmk_resource_t rsc, pcmk_node_t node, bool optional)
	{
	CRM_ASSERT(false);
	}

	/*!
	* \internal
	* \brief Schedule cleanup of a resource
	*
	* \param[in,out] rsc Resource to clean up
	* \param[in] node Node to clean up on
	* \param[in] optional Whether clean-up should be optional
	*/
	void
	pcmk__schedule_cleanup(pcmk_resource_t rsc, const pcmk_node_t node,
	bool optional)
	{
	/* If the cleanup is required, its orderings are optional, because they're
	* relevant only if both actions are required. Conversely, if the cleanup is
	* optional, the orderings make the then action required if the first action
	* becomes required.
	*/
	uint32_t flag = optional? pcmk__ar_first_implies_then : pcmk__ar_ordered;

	CRM_CHECK((rsc != NULL) && (node != NULL), return);

	if (pcmk_is_set(rsc->flags, pcmk_rsc_failed)) {
	pcmk__rsc_trace(rsc, "Skipping clean-up of %s on %s: resource failed",
	rsc->id, pe__node_name(node));
	return;
	}

	if (node->details->unclean \|\| !node->details->online) {
	pcmk__rsc_trace(rsc, "Skipping clean-up of %s on %s: node unavailable",
	rsc->id, pe__node_name(node));
	return;
	}

	crm_notice("Scheduling clean-up of %s on %s", rsc->id, pe__node_name(node));
	delete_action(rsc, node, optional);

	// stop -> clean-up -> start
	pcmk__order_resource_actions(rsc, PCMK_ACTION_STOP,
	rsc, PCMK_ACTION_DELETE, flag);
	pcmk__order_resource_actions(rsc, PCMK_ACTION_DELETE,
	rsc, PCMK_ACTION_START, flag);
	}

	/*!
	* \internal
	* \brief Add primitive meta-attributes relevant to graph actions to XML
	*
	* \param[in] rsc Primitive resource whose meta-attributes should be added
	* \param[in,out] xml Transition graph action attributes XML to add to
	*/
	void
	pcmk__primitive_add_graph_meta(const pcmk_resource_t rsc, xmlNode xml)
	{
	char *name = NULL;
	char *value = NULL;
	const pcmk_resource_t *parent = NULL;

	CRM_ASSERT((rsc != NULL) && (rsc->variant == pcmk_rsc_variant_primitive)
	&& (xml != NULL));

	/* Clone instance numbers get set internally as meta-attributes, and are
	* needed in the transition graph (for example, to tell unique clone
	* instances apart).
	*/
	value = g_hash_table_lookup(rsc->meta, PCMK__META_CLONE_INSTANCE_NUM);
	if (value != NULL) {
	name = crm_meta_name(PCMK__META_CLONE_INSTANCE_NUM);
	crm_xml_add(xml, name, value);
	free(name);
	}

	// Not sure if this one is really needed ...
	value = g_hash_table_lookup(rsc->meta, PCMK_META_REMOTE_NODE);
	if (value != NULL) {
	name = crm_meta_name(PCMK_META_REMOTE_NODE);
	crm_xml_add(xml, name, value);
	free(name);
	}

	/* The container meta-attribute can be set on the primitive itself or one of
	* its parents (for example, a group inside a container resource), so check
	* them all, and keep the highest one found.
	*/
	for (parent = rsc; parent != NULL; parent = parent->parent) {
	if (parent->container != NULL) {
	crm_xml_add(xml, CRM_META "_" PCMK__META_CONTAINER,
	parent->container->id);
	}
	}

	/* Bundle replica children will get their external-ip set internally as a
	* meta-attribute. The graph action needs it, but under a different naming
	* convention than other meta-attributes.
	*/
	value = g_hash_table_lookup(rsc->meta, "external-ip");
	if (value != NULL) {
	crm_xml_add(xml, "pcmk_external_ip", value);
	}
	}

	// Primitive implementation of pcmk_assignment_methods_t:add_utilization()
	void
	pcmk__primitive_add_utilization(const pcmk_resource_t *rsc,
	const pcmk_resource_t *orig_rsc,
	GList all_rscs, GHashTable utilization)
	{
	CRM_ASSERT((rsc != NULL) && (rsc->variant == pcmk_rsc_variant_primitive)
	&& (orig_rsc != NULL) && (utilization != NULL));

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

	pcmk__rsc_trace(orig_rsc,
	"%s: Adding primitive %s as colocated utilization",
	orig_rsc->id, rsc->id);
	pcmk__release_node_capacity(utilization, rsc);
	}

	/*!
	* \internal
	* \brief Get epoch time of node's shutdown attribute (or now if none)
	*
	* \param[in,out] node Node to check
	*
	* \return Epoch time corresponding to shutdown attribute if set or now if not
	*/
	static time_t
	shutdown_time(pcmk_node_t *node)
	{
	const char *shutdown = pe_node_attribute_raw(node, XML_CIB_ATTR_SHUTDOWN);
	time_t result = 0;

	if (shutdown != NULL) {
	long long result_ll;

	if (pcmk__scan_ll(shutdown, &result_ll, 0LL) == pcmk_rc_ok) {
	result = (time_t) result_ll;
	}
	}
	return (result == 0)? get_effective_time(node->details->data_set) : result;
	}

	/*!
	* \internal
	* \brief Ban a resource from a node if it's not locked to the node
	*
	* \param[in] data Node to check
	* \param[in,out] user_data Resource to check
	*/
	static void
	ban_if_not_locked(gpointer data, gpointer user_data)
	{
	const pcmk_node_t node = (const pcmk_node_t ) data;
	pcmk_resource_t rsc = (pcmk_resource_t ) user_data;

	if (strcmp(node->details->uname, rsc->lock_node->details->uname) != 0) {
	resource_location(rsc, node, -CRM_SCORE_INFINITY,
	PCMK_OPT_SHUTDOWN_LOCK, rsc->cluster);
	}
	}

	// Primitive implementation of pcmk_assignment_methods_t:shutdown_lock()
	void
	pcmk__primitive_shutdown_lock(pcmk_resource_t *rsc)
	{
	const char *class = NULL;

	CRM_ASSERT((rsc != NULL) && (rsc->variant == pcmk_rsc_variant_primitive));

	class = crm_element_value(rsc->xml, XML_AGENT_ATTR_CLASS);

	// Fence devices and remote connections can't be locked
	if (pcmk__str_eq(class, PCMK_RESOURCE_CLASS_STONITH, pcmk__str_null_matches)
	\|\| pe__resource_is_remote_conn(rsc)) {
	return;
	}

	if (rsc->lock_node != NULL) {
	// The lock was obtained from resource history

	if (rsc->running_on != NULL) {
	/* The resource was started elsewhere even though it is now
	* considered locked. This shouldn't be possible, but as a
	* failsafe, we don't want to disturb the resource now.
	*/
	pcmk__rsc_info(rsc,
	"Cancelling shutdown lock "
	"because %s is already active", rsc->id);
	pe__clear_resource_history(rsc, rsc->lock_node);
	rsc->lock_node = NULL;
	rsc->lock_time = 0;
	}

	// Only a resource active on exactly one node can be locked
	} else if (pcmk__list_of_1(rsc->running_on)) {
	pcmk_node_t *node = rsc->running_on->data;

	if (node->details->shutdown) {
	if (node->details->unclean) {
	pcmk__rsc_debug(rsc,
	"Not locking %s to unclean %s for shutdown",
	rsc->id, pe__node_name(node));
	} else {
	rsc->lock_node = node;
	rsc->lock_time = shutdown_time(node);
	}
	}
	}

	if (rsc->lock_node == NULL) {
	// No lock needed
	return;
	}

	if (rsc->cluster->shutdown_lock > 0) {
	time_t lock_expiration = rsc->lock_time + rsc->cluster->shutdown_lock;

	pcmk__rsc_info(rsc, "Locking %s to %s due to shutdown (expires @%lld)",
	rsc->id, pe__node_name(rsc->lock_node),
	(long long) lock_expiration);
	pe__update_recheck_time(++lock_expiration, rsc->cluster,
	"shutdown lock expiration");
	} else {
	pcmk__rsc_info(rsc, "Locking %s to %s due to shutdown",
	rsc->id, pe__node_name(rsc->lock_node));
	}

	// If resource is locked to one node, ban it from all other nodes
	g_list_foreach(rsc->cluster->nodes, ban_if_not_locked, rsc);
	}

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