Adding upstream version 6.9.7.upstream/6.9.7

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 373 insertions, 0 deletions

diff --git a/drivers/md/dm-vdo/logical-zone.c b/drivers/md/dm-vdo/logical-zone.c
new file mode 100644
index 0000000000..026f031ffc
--- /dev/null
+++ b/drivers/md/dm-vdo/logical-zone.c
@@ -0,0 +1,373 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2023 Red Hat
+ */
+
+#include "logical-zone.h"
+
+#include "logger.h"
+#include "memory-alloc.h"
+#include "permassert.h"
+#include "string-utils.h"
+
+#include "action-manager.h"
+#include "admin-state.h"
+#include "block-map.h"
+#include "completion.h"
+#include "constants.h"
+#include "data-vio.h"
+#include "flush.h"
+#include "int-map.h"
+#include "physical-zone.h"
+#include "vdo.h"
+
+#define ALLOCATIONS_PER_ZONE 128
+
+/**
+ * as_logical_zone() - Convert a generic vdo_completion to a logical_zone.
+ * @completion: The completion to convert.
+ *
+ * Return: The completion as a logical_zone.
+ */
+static struct logical_zone *as_logical_zone(struct vdo_completion *completion)
+{
+	vdo_assert_completion_type(completion, VDO_GENERATION_FLUSHED_COMPLETION);
+	return container_of(completion, struct logical_zone, completion);
+}
+
+/* get_thread_id_for_zone() - Implements vdo_zone_thread_getter_fn. */
+static thread_id_t get_thread_id_for_zone(void *context, zone_count_t zone_number)
+{
+	struct logical_zones *zones = context;
+
+	return zones->zones[zone_number].thread_id;
+}
+
+/**
+ * initialize_zone() - Initialize a logical zone.
+ * @zones: The logical_zones to which this zone belongs.
+ * @zone_number: The logical_zone's index.
+ */
+static int initialize_zone(struct logical_zones *zones, zone_count_t zone_number)
+{
+	int result;
+	struct vdo *vdo = zones->vdo;
+	struct logical_zone *zone = &zones->zones[zone_number];
+	zone_count_t allocation_zone_number;
+
+	result = vdo_int_map_create(VDO_LOCK_MAP_CAPACITY, &zone->lbn_operations);
+	if (result != VDO_SUCCESS)
+		return result;
+
+	if (zone_number < vdo->thread_config.logical_zone_count - 1)
+		zone->next = &zones->zones[zone_number + 1];
+
+	vdo_initialize_completion(&zone->completion, vdo,
+				  VDO_GENERATION_FLUSHED_COMPLETION);
+	zone->zones = zones;
+	zone->zone_number = zone_number;
+	zone->thread_id = vdo->thread_config.logical_threads[zone_number];
+	zone->block_map_zone = &vdo->block_map->zones[zone_number];
+	INIT_LIST_HEAD(&zone->write_vios);
+	vdo_set_admin_state_code(&zone->state, VDO_ADMIN_STATE_NORMAL_OPERATION);
+
+	allocation_zone_number = zone->thread_id % vdo->thread_config.physical_zone_count;
+	zone->allocation_zone = &vdo->physical_zones->zones[allocation_zone_number];
+
+	return vdo_make_default_thread(vdo, zone->thread_id);
+}
+
+/**
+ * vdo_make_logical_zones() - Create a set of logical zones.
+ * @vdo: The vdo to which the zones will belong.
+ * @zones_ptr: A pointer to hold the new zones.
+ *
+ * Return: VDO_SUCCESS or an error code.
+ */
+int vdo_make_logical_zones(struct vdo *vdo, struct logical_zones **zones_ptr)
+{
+	struct logical_zones *zones;
+	int result;
+	zone_count_t zone;
+	zone_count_t zone_count = vdo->thread_config.logical_zone_count;
+
+	if (zone_count == 0)
+		return VDO_SUCCESS;
+
+	result = vdo_allocate_extended(struct logical_zones, zone_count,
+				       struct logical_zone, __func__, &zones);
+	if (result != VDO_SUCCESS)
+		return result;
+
+	zones->vdo = vdo;
+	zones->zone_count = zone_count;
+	for (zone = 0; zone < zone_count; zone++) {
+		result = initialize_zone(zones, zone);
+		if (result != VDO_SUCCESS) {
+			vdo_free_logical_zones(zones);
+			return result;
+		}
+	}
+
+	result = vdo_make_action_manager(zones->zone_count, get_thread_id_for_zone,
+					 vdo->thread_config.admin_thread, zones, NULL,
+					 vdo, &zones->manager);
+	if (result != VDO_SUCCESS) {
+		vdo_free_logical_zones(zones);
+		return result;
+	}
+
+	*zones_ptr = zones;
+	return VDO_SUCCESS;
+}
+
+/**
+ * vdo_free_logical_zones() - Free a set of logical zones.
+ * @zones: The set of zones to free.
+ */
+void vdo_free_logical_zones(struct logical_zones *zones)
+{
+	zone_count_t index;
+
+	if (zones == NULL)
+		return;
+
+	vdo_free(vdo_forget(zones->manager));
+
+	for (index = 0; index < zones->zone_count; index++)
+		vdo_int_map_free(vdo_forget(zones->zones[index].lbn_operations));
+
+	vdo_free(zones);
+}
+
+static inline void assert_on_zone_thread(struct logical_zone *zone, const char *what)
+{
+	VDO_ASSERT_LOG_ONLY((vdo_get_callback_thread_id() == zone->thread_id),
+			    "%s() called on correct thread", what);
+}
+
+/**
+ * check_for_drain_complete() - Check whether this zone has drained.
+ * @zone: The zone to check.
+ */
+static void check_for_drain_complete(struct logical_zone *zone)
+{
+	if (!vdo_is_state_draining(&zone->state) || zone->notifying ||
+	    !list_empty(&zone->write_vios))
+		return;
+
+	vdo_finish_draining(&zone->state);
+}
+
+/**
+ * initiate_drain() - Initiate a drain.
+ *
+ * Implements vdo_admin_initiator_fn.
+ */
+static void initiate_drain(struct admin_state *state)
+{
+	check_for_drain_complete(container_of(state, struct logical_zone, state));
+}
+
+/**
+ * drain_logical_zone() - Drain a logical zone.
+ *
+ * Implements vdo_zone_action_fn.
+ */
+static void drain_logical_zone(void *context, zone_count_t zone_number,
+			       struct vdo_completion *parent)
+{
+	struct logical_zones *zones = context;
+
+	vdo_start_draining(&zones->zones[zone_number].state,
+			   vdo_get_current_manager_operation(zones->manager), parent,
+			   initiate_drain);
+}
+
+void vdo_drain_logical_zones(struct logical_zones *zones,
+			     const struct admin_state_code *operation,
+			     struct vdo_completion *parent)
+{
+	vdo_schedule_operation(zones->manager, operation, NULL, drain_logical_zone, NULL,
+			       parent);
+}
+
+/**
+ * resume_logical_zone() - Resume a logical zone.
+ *
+ * Implements vdo_zone_action_fn.
+ */
+static void resume_logical_zone(void *context, zone_count_t zone_number,
+				struct vdo_completion *parent)
+{
+	struct logical_zone *zone = &(((struct logical_zones *) context)->zones[zone_number]);
+
+	vdo_fail_completion(parent, vdo_resume_if_quiescent(&zone->state));
+}
+
+/**
+ * vdo_resume_logical_zones() - Resume a set of logical zones.
+ * @zones: The logical zones to resume.
+ * @parent: The object to notify when the zones have resumed.
+ */
+void vdo_resume_logical_zones(struct logical_zones *zones, struct vdo_completion *parent)
+{
+	vdo_schedule_operation(zones->manager, VDO_ADMIN_STATE_RESUMING, NULL,
+			       resume_logical_zone, NULL, parent);
+}
+
+/**
+ * update_oldest_active_generation() - Update the oldest active generation.
+ * @zone: The zone.
+ *
+ * Return: true if the oldest active generation has changed.
+ */
+static bool update_oldest_active_generation(struct logical_zone *zone)
+{
+	struct data_vio *data_vio =
+		list_first_entry_or_null(&zone->write_vios, struct data_vio,
+					 write_entry);
+	sequence_number_t oldest =
+		(data_vio == NULL) ? zone->flush_generation : data_vio->flush_generation;
+
+	if (oldest == zone->oldest_active_generation)
+		return false;
+
+	WRITE_ONCE(zone->oldest_active_generation, oldest);
+	return true;
+}
+
+/**
+ * vdo_increment_logical_zone_flush_generation() - Increment the flush generation in a logical
+ *                                                 zone.
+ * @zone: The logical zone.
+ * @expected_generation: The expected value of the flush generation before the increment.
+ */
+void vdo_increment_logical_zone_flush_generation(struct logical_zone *zone,
+						 sequence_number_t expected_generation)
+{
+	assert_on_zone_thread(zone, __func__);
+	VDO_ASSERT_LOG_ONLY((zone->flush_generation == expected_generation),
+			    "logical zone %u flush generation %llu should be %llu before increment",
+			    zone->zone_number, (unsigned long long) zone->flush_generation,
+			    (unsigned long long) expected_generation);
+
+	zone->flush_generation++;
+	zone->ios_in_flush_generation = 0;
+	update_oldest_active_generation(zone);
+}
+
+/**
+ * vdo_acquire_flush_generation_lock() - Acquire the shared lock on a flush generation by a write
+ *                                       data_vio.
+ * @data_vio: The data_vio.
+ */
+void vdo_acquire_flush_generation_lock(struct data_vio *data_vio)
+{
+	struct logical_zone *zone = data_vio->logical.zone;
+
+	assert_on_zone_thread(zone, __func__);
+	VDO_ASSERT_LOG_ONLY(vdo_is_state_normal(&zone->state), "vdo state is normal");
+
+	data_vio->flush_generation = zone->flush_generation;
+	list_add_tail(&data_vio->write_entry, &zone->write_vios);
+	zone->ios_in_flush_generation++;
+}
+
+static void attempt_generation_complete_notification(struct vdo_completion *completion);
+
+/**
+ * notify_flusher() - Notify the flush that at least one generation no longer has active VIOs.
+ * @completion: The zone completion.
+ *
+ * This callback is registered in attempt_generation_complete_notification().
+ */
+static void notify_flusher(struct vdo_completion *completion)
+{
+	struct logical_zone *zone = as_logical_zone(completion);
+
+	vdo_complete_flushes(zone->zones->vdo->flusher);
+	vdo_launch_completion_callback(completion,
+				       attempt_generation_complete_notification,
+				       zone->thread_id);
+}
+
+/**
+ * attempt_generation_complete_notification() - Notify the flusher if some generation no
+ *                                              longer has active VIOs.
+ * @completion: The zone completion.
+ */
+static void attempt_generation_complete_notification(struct vdo_completion *completion)
+{
+	struct logical_zone *zone = as_logical_zone(completion);
+
+	assert_on_zone_thread(zone, __func__);
+	if (zone->oldest_active_generation <= zone->notification_generation) {
+		zone->notifying = false;
+		check_for_drain_complete(zone);
+		return;
+	}
+
+	zone->notifying = true;
+	zone->notification_generation = zone->oldest_active_generation;
+	vdo_launch_completion_callback(&zone->completion, notify_flusher,
+				       vdo_get_flusher_thread_id(zone->zones->vdo->flusher));
+}
+
+/**
+ * vdo_release_flush_generation_lock() - Release the shared lock on a flush generation held by a
+ *                                       write data_vio.
+ * @data_vio: The data_vio whose lock is to be released.
+ *
+ * If there are pending flushes, and this data_vio completes the oldest generation active in this
+ * zone, an attempt will be made to finish any flushes which may now be complete.
+ */
+void vdo_release_flush_generation_lock(struct data_vio *data_vio)
+{
+	struct logical_zone *zone = data_vio->logical.zone;
+
+	assert_on_zone_thread(zone, __func__);
+
+	if (!data_vio_has_flush_generation_lock(data_vio))
+		return;
+
+	list_del_init(&data_vio->write_entry);
+	VDO_ASSERT_LOG_ONLY((zone->oldest_active_generation <= data_vio->flush_generation),
+			    "data_vio releasing lock on generation %llu is not older than oldest active generation %llu",
+			    (unsigned long long) data_vio->flush_generation,
+			    (unsigned long long) zone->oldest_active_generation);
+
+	if (!update_oldest_active_generation(zone) || zone->notifying)
+		return;
+
+	attempt_generation_complete_notification(&zone->completion);
+}
+
+struct physical_zone *vdo_get_next_allocation_zone(struct logical_zone *zone)
+{
+	if (zone->allocation_count == ALLOCATIONS_PER_ZONE) {
+		zone->allocation_count = 0;
+		zone->allocation_zone = zone->allocation_zone->next;
+	}
+
+	zone->allocation_count++;
+	return zone->allocation_zone;
+}
+
+/**
+ * vdo_dump_logical_zone() - Dump information about a logical zone to the log for debugging.
+ * @zone: The zone to dump
+ *
+ * Context: the information is dumped in a thread-unsafe fashion.
+ *
+ */
+void vdo_dump_logical_zone(const struct logical_zone *zone)
+{
+	vdo_log_info("logical_zone %u", zone->zone_number);
+	vdo_log_info("  flush_generation=%llu oldest_active_generation=%llu notification_generation=%llu notifying=%s ios_in_flush_generation=%llu",
+		     (unsigned long long) READ_ONCE(zone->flush_generation),
+		     (unsigned long long) READ_ONCE(zone->oldest_active_generation),
+		     (unsigned long long) READ_ONCE(zone->notification_generation),
+		     vdo_bool_to_string(READ_ONCE(zone->notifying)),
+		     (unsigned long long) READ_ONCE(zone->ios_in_flush_generation));
+}