[VDO-5662, VDO-5663] Remove sysfs from upstream

Documentation/admin-guide/device-mapper/vdo.rst

@@ -315,6 +315,13 @@ GB of RAM per 1 TB of window. For sparse indexes, the index requires 1 GB
 of RAM per 10 TB of window. The index configuration is set when the target
 is formatted and may not be modified.
 
+Module Parameters
+=================
+
+The vdo driver has a numeric parameter 'log_level' which controls the
+verbosity of logging from the driver. The default setting is 6
+(LOGLEVEL_INFO and more severe messages).
+
 Run-time Usage
 ==============
 

drivers/md/dm-vdo/Makefile

@@ -28,19 +28,15 @@ dm-vdo-objs := \
 	packer.o \
 	permassert.o \
 	physical-zone.o \
-	pool-sysfs.o \
-	pool-sysfs-stats.o \
 	priority-table.o \
 	recovery-journal.o \
 	repair.o \
 	slab-depot.o \
 	status-codes.o \
 	string-utils.o \
-	sysfs.o \
 	thread-device.o \
 	thread-registry.o \
 	thread-utils.o \
-	uds-sysfs.o \
 	vdo.o \
 	vio.o \
 	wait-queue.o \

drivers/md/dm-vdo/dedupe.c

@@ -120,7 +120,6 @@
 #include <linux/atomic.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
-#include <linux/kobject.h>
 #include <linux/list.h>
 #include <linux/ratelimit.h>
 #include <linux/spinlock.h>
@@ -279,7 +278,6 @@ struct hash_lock {
 
 struct hash_zones {
 	struct action_manager *manager;
-	struct kobject dedupe_directory;
 	struct uds_parameters parameters;
 	struct uds_index_session *index_session;
 	struct ratelimit_state ratelimiter;
@@ -2022,56 +2020,6 @@ void vdo_share_compressed_write_lock(struct data_vio *data_vio,
 	VDO_ASSERT_LOG_ONLY(claimed, "impossible to fail to claim an initial increment");
 }
 
-static void dedupe_kobj_release(struct kobject *directory)
-{
-	vdo_free(container_of(directory, struct hash_zones, dedupe_directory));
-}
-
-static ssize_t dedupe_status_show(struct kobject *directory, struct attribute *attr,
-				  char *buf)
-{
-	struct uds_attribute *ua = container_of(attr, struct uds_attribute, attr);
-	struct hash_zones *zones = container_of(directory, struct hash_zones,
-						dedupe_directory);
-
-	if (ua->show_string != NULL)
-		return sprintf(buf, "%s\n", ua->show_string(zones));
-	else
-		return -EINVAL;
-}
-
-static ssize_t dedupe_status_store(struct kobject *kobj __always_unused,
-				   struct attribute *attr __always_unused,
-				   const char *buf __always_unused,
-				   size_t length __always_unused)
-{
-	return -EINVAL;
-}
-
-/*----------------------------------------------------------------------*/
-
-static const struct sysfs_ops dedupe_sysfs_ops = {
-	.show = dedupe_status_show,
-	.store = dedupe_status_store,
-};
-
-static struct uds_attribute dedupe_status_attribute = {
-	.attr = {.name = "status", .mode = 0444, },
-	.show_string = vdo_get_dedupe_index_state_name,
-};
-
-static struct attribute *dedupe_attrs[] = {
-	&dedupe_status_attribute.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(dedupe);
-
-static const struct kobj_type dedupe_directory_type = {
-	.release = dedupe_kobj_release,
-	.sysfs_ops = &dedupe_sysfs_ops,
-	.default_groups = dedupe_groups,
-};
-
 static void start_uds_queue(void *ptr)
 {
 	/*
@@ -2266,7 +2214,6 @@ static int initialize_index(struct vdo *vdo, struct hash_zones *zones)
 	vdo_initialize_completion(&zones->completion, vdo, VDO_HASH_ZONES_COMPLETION);
 	vdo_set_completion_callback(&zones->completion, change_dedupe_state,
 				    vdo->thread_config.dedupe_thread);
-	kobject_init(&zones->dedupe_directory, &dedupe_directory_type);
 	return VDO_SUCCESS;
 }
 
@@ -2537,10 +2484,7 @@ void vdo_free_hash_zones(struct hash_zones *zones)
 		vdo_finish_dedupe_index(zones);
 
 	ratelimit_state_exit(&zones->ratelimiter);
-	if (vdo_get_admin_state_code(&zones->state) == VDO_ADMIN_STATE_NEW)
-		vdo_free(zones);
-	else
-		kobject_put(&zones->dedupe_directory);
+	vdo_free(zones);
 }
 
 static void initiate_suspend_index(struct admin_state *state)
@@ -3047,17 +2991,9 @@ int vdo_message_dedupe_index(struct hash_zones *zones, const char *name)
 	return -EINVAL;
 }
 
-int vdo_add_dedupe_index_sysfs(struct hash_zones *zones)
+void vdo_set_dedupe_state_normal(struct hash_zones *zones)
 {
-	int result = kobject_add(&zones->dedupe_directory,
-				 &zones->completion.vdo->vdo_directory, "dedupe");
-
-	if (result == 0) {
-		vdo_set_admin_state_code(&zones->state,
-					 VDO_ADMIN_STATE_NORMAL_OPERATION);
-	}
-
-	return result;
+	vdo_set_admin_state_code(&zones->state, VDO_ADMIN_STATE_NORMAL_OPERATION);
 }
 
 /* If create_flag, create a new index without first attempting to load an existing index. */

drivers/md/dm-vdo/dedupe.h

@@ -97,7 +97,7 @@ u64 vdo_get_dedupe_index_timeout_count(struct hash_zones *zones);
 
 int vdo_message_dedupe_index(struct hash_zones *zones, const char *name);
 
-int vdo_add_dedupe_index_sysfs(struct hash_zones *zones);
+void vdo_set_dedupe_state_normal(struct hash_zones *zones);
 
 void vdo_start_dedupe_index(struct hash_zones *zones, bool create_flag);
 

drivers/md/dm-vdo/dm-vdo-target.c

@@ -27,7 +27,6 @@
 #include "logger.h"
 #include "memory-alloc.h"
 #include "message-stats.h"
-#include "pool-sysfs.h"
 #include "recovery-journal.h"
 #include "repair.h"
 #include "slab-depot.h"
@@ -36,7 +35,6 @@
 #include "thread-device.h"
 #include "thread-registry.h"
 #include "types.h"
-#include "uds-sysfs.h"
 #include "vdo.h"
 #include "vio.h"
 
@@ -54,7 +52,6 @@ enum admin_phases {
 	GROW_PHYSICAL_PHASE_END,
 	GROW_PHYSICAL_PHASE_ERROR,
 	LOAD_PHASE_START,
-	LOAD_PHASE_STATS,
 	LOAD_PHASE_LOAD_DEPOT,
 	LOAD_PHASE_MAKE_DIRTY,
 	LOAD_PHASE_PREPARE_TO_ALLOCATE,
@@ -104,7 +101,6 @@ static const char * const ADMIN_PHASE_NAMES[] = {
 	"GROW_PHYSICAL_PHASE_END",
 	"GROW_PHYSICAL_PHASE_ERROR",
 	"LOAD_PHASE_START",
-	"LOAD_PHASE_STATS",
 	"LOAD_PHASE_LOAD_DEPOT",
 	"LOAD_PHASE_MAKE_DIRTY",
 	"LOAD_PHASE_PREPARE_TO_ALLOCATE",
@@ -947,8 +943,8 @@ static void vdo_io_hints(struct dm_target *ti, struct queue_limits *limits)
 	 * blocked task warnings in kernel logs. In order to avoid these warnings, we choose to
 	 * use the smallest reasonable value.
 	 *
-	 * The value is displayed in sysfs, and also used by dm-thin to determine whether to pass
-	 * down discards. The block layer splits large discards on this boundary when this is set.
+	 * The value is used by dm-thin to determine whether to pass down discards. The block layer
+	 * splits large discards on this boundary when this is set.
 	 */
 	limits->max_discard_sectors =
 		(vdo->device_config->max_discard_blocks * VDO_SECTORS_PER_BLOCK);
@@ -2174,32 +2170,6 @@ static enum slab_depot_load_type get_load_type(struct vdo *vdo)
 	return VDO_SLAB_DEPOT_NORMAL_LOAD;
 }
 
-/**
- * vdo_initialize_kobjects() - Initialize the vdo sysfs directory.
- * @vdo: The vdo being initialized.
- *
- * Return: VDO_SUCCESS or an error code.
- */
-static int vdo_initialize_kobjects(struct vdo *vdo)
-{
-	int result;
-	struct dm_target *target = vdo->device_config->owning_target;
-	struct mapped_device *md = dm_table_get_md(target->table);
-
-	kobject_init(&vdo->vdo_directory, &vdo_directory_type);
-	vdo->sysfs_added = true;
-	result = kobject_add(&vdo->vdo_directory, &disk_to_dev(dm_disk(md))->kobj,
-			     "vdo");
-	if (result != 0)
-		return VDO_CANT_ADD_SYSFS_NODE;
-
-	result = vdo_add_dedupe_index_sysfs(vdo->hash_zones);
-	if (result != 0)
-		return VDO_CANT_ADD_SYSFS_NODE;
-
-	return vdo_add_sysfs_stats_dir(vdo);
-}
-
 /**
  * load_callback() - Callback to do the destructive parts of loading a VDO.
  * @completion: The sub-task completion.
@@ -2225,11 +2195,8 @@ static void load_callback(struct vdo_completion *completion)
 		vdo_allow_read_only_mode_entry(completion);
 		return;
 
-	case LOAD_PHASE_STATS:
-		vdo_continue_completion(completion, vdo_initialize_kobjects(vdo));
-		return;
-
 	case LOAD_PHASE_LOAD_DEPOT:
+		vdo_set_dedupe_state_normal(vdo->hash_zones);
 		if (vdo_is_read_only(vdo)) {
 			/*
 			 * In read-only mode we don't use the allocator and it may not even be
@@ -2866,7 +2833,7 @@ static void vdo_resume(struct dm_target *ti)
 static struct target_type vdo_target_bio = {
 	.features = DM_TARGET_SINGLETON,
 	.name = "vdo",
-	.version = { 8, 2, 0 },
+	.version = { 9, 0, 0 },
 	.module = THIS_MODULE,
 	.ctr = vdo_ctr,
 	.dtr = vdo_dtr,
@@ -2905,8 +2872,6 @@ static int __init vdo_init(void)
 
 	/* Memory tracking must be initialized first for accurate accounting. */
 	vdo_memory_init();
-	uds_init_sysfs();
-
 	vdo_initialize_thread_device_registry();
 	vdo_initialize_device_registry_once();
 	uds_log_info("loaded version %s", CURRENT_VERSION);
@@ -2933,14 +2898,16 @@ static int __init vdo_init(void)
 static void __exit vdo_exit(void)
 {
 	vdo_module_destroy();
-	uds_put_sysfs();
 	/* Memory tracking cleanup must be done last. */
 	vdo_memory_exit();
 }
 
 module_init(vdo_init);
 module_exit(vdo_exit);
 
+module_param_named(log_level, vdo_log_level, uint, 0644);
+MODULE_PARM_DESC(log_level, "Log level for log messages");
+
 MODULE_DESCRIPTION(DM_NAME " target for transparent deduplication");
 MODULE_AUTHOR("Red Hat, Inc.");
 MODULE_LICENSE("GPL");

drivers/md/dm-vdo/logger.c

@@ -16,69 +16,17 @@
 #include "thread-device.h"
 #include "thread-utils.h"
 
-struct priority_name {
-	const char *name;
-	const int priority;
-};
-
-static const struct priority_name PRIORITIES[] = {
-	{ "ALERT", UDS_LOG_ALERT },
-	{ "CRITICAL", UDS_LOG_CRIT },
-	{ "CRIT", UDS_LOG_CRIT },
-	{ "DEBUG", UDS_LOG_DEBUG },
-	{ "EMERGENCY", UDS_LOG_EMERG },
-	{ "EMERG", UDS_LOG_EMERG },
-	{ "ERROR", UDS_LOG_ERR },
-	{ "ERR", UDS_LOG_ERR },
-	{ "INFO", UDS_LOG_INFO },
-	{ "NOTICE", UDS_LOG_NOTICE },
-	{ "PANIC", UDS_LOG_EMERG },
-	{ "WARN", UDS_LOG_WARNING },
-	{ "WARNING", UDS_LOG_WARNING },
-	{ NULL, -1 },
-};
-
-static const char *const PRIORITY_STRINGS[] = {
-	"EMERGENCY",
-	"ALERT",
-	"CRITICAL",
-	"ERROR",
-	"WARN",
-	"NOTICE",
-	"INFO",
-	"DEBUG",
-};
-
-static int log_level = UDS_LOG_INFO;
+int vdo_log_level = UDS_LOG_DEFAULT;
 
 int uds_get_log_level(void)
 {
-	return log_level;
-}
-
-void uds_set_log_level(int new_log_level)
-{
-	log_level = new_log_level;
-}
-
-int uds_log_string_to_priority(const char *string)
-{
-	int i;
+	int log_level_latch = READ_ONCE(vdo_log_level);
 
-	for (i = 0; PRIORITIES[i].name != NULL; i++) {
-		if (strcasecmp(string, PRIORITIES[i].name) == 0)
-			return PRIORITIES[i].priority;
+	if (unlikely(log_level_latch > UDS_LOG_MAX)) {
+		log_level_latch = UDS_LOG_DEFAULT;
+		WRITE_ONCE(vdo_log_level, log_level_latch);
 	}
-
-	return UDS_LOG_INFO;
-}
-
-const char *uds_log_priority_to_string(int priority)
-{
-	if ((priority < 0) || (priority >= (int) ARRAY_SIZE(PRIORITY_STRINGS)))
-		return "unknown";
-
-	return PRIORITY_STRINGS[priority];
+	return log_level_latch;
 }
 
 static const char *get_current_interrupt_type(void)