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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright 2023 Red Hat
*/
#include "uds-sysfs.h"
#include <linux/kobject.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "logger.h"
#include "memory-alloc.h"
#include "string-utils.h"
#include "indexer.h"
#define UDS_SYSFS_NAME "uds"
static struct {
/* /sys/uds */
struct kobject kobj;
/* /sys/uds/parameter */
struct kobject parameter_kobj;
/* These flags are used to ensure a clean shutdown */
/* /sys/uds flag */
bool flag;
/* /sys/uds/parameter flag */
bool parameter_flag;
} object_root;
static char *buffer_to_string(const char *buf, size_t length)
{
char *string;
if (vdo_allocate(length + 1, char, __func__, &string) != VDO_SUCCESS)
return NULL;
memcpy(string, buf, length);
string[length] = '\0';
if (string[length - 1] == '\n')
string[length - 1] = '\0';
return string;
}
/*
* This is the code for any directory in the /sys/<module_name> tree that contains no regular files
* (only subdirectories).
*/
static void empty_release(struct kobject *kobj)
{
}
static ssize_t empty_show(struct kobject *kobj, struct attribute *attr, char *buf)
{
return 0;
}
static ssize_t empty_store(struct kobject *kobj, struct attribute *attr, const char *buf,
size_t length)
{
return length;
}
static const struct sysfs_ops empty_ops = {
.show = empty_show,
.store = empty_store,
};
static struct attribute *empty_attrs[] = {
NULL,
};
ATTRIBUTE_GROUPS(empty);
static const struct kobj_type empty_object_type = {
.release = empty_release,
.sysfs_ops = &empty_ops,
.default_groups = empty_groups,
};
/*
* This is the code for the /sys/<module_name>/parameter directory.
* <dir>/log_level UDS_LOG_LEVEL
*/
struct parameter_attribute {
struct attribute attr;
const char *(*show_string)(void);
void (*store_string)(const char *string);
};
static ssize_t parameter_show(struct kobject *kobj, struct attribute *attr, char *buf)
{
struct parameter_attribute *pa;
pa = container_of(attr, struct parameter_attribute, attr);
if (pa->show_string != NULL)
return sprintf(buf, "%s\n", pa->show_string());
else
return -EINVAL;
}
static ssize_t parameter_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t length)
{
char *string;
struct parameter_attribute *pa;
pa = container_of(attr, struct parameter_attribute, attr);
if (pa->store_string == NULL)
return -EINVAL;
string = buffer_to_string(buf, length);
if (string == NULL)
return -ENOMEM;
pa->store_string(string);
vdo_free(string);
return length;
}
static const char *parameter_show_log_level(void)
{
return uds_log_priority_to_string(uds_get_log_level());
}
static void parameter_store_log_level(const char *string)
{
uds_set_log_level(uds_log_string_to_priority(string));
}
static struct parameter_attribute log_level_attr = {
.attr = { .name = "log_level", .mode = 0600 },
.show_string = parameter_show_log_level,
.store_string = parameter_store_log_level,
};
static struct attribute *parameter_attrs[] = {
&log_level_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(parameter);
static const struct sysfs_ops parameter_ops = {
.show = parameter_show,
.store = parameter_store,
};
static const struct kobj_type parameter_object_type = {
.release = empty_release,
.sysfs_ops = ¶meter_ops,
.default_groups = parameter_groups,
};
int uds_init_sysfs(void)
{
int result;
memset(&object_root, 0, sizeof(object_root));
kobject_init(&object_root.kobj, &empty_object_type);
result = kobject_add(&object_root.kobj, NULL, UDS_SYSFS_NAME);
if (result == 0) {
object_root.flag = true;
kobject_init(&object_root.parameter_kobj, ¶meter_object_type);
result = kobject_add(&object_root.parameter_kobj, &object_root.kobj,
"parameter");
if (result == 0)
object_root.parameter_flag = true;
}
if (result != 0)
uds_put_sysfs();
return result;
}
void uds_put_sysfs(void)
{
if (object_root.parameter_flag)
kobject_put(&object_root.parameter_kobj);
if (object_root.flag)
kobject_put(&object_root.kobj);
}
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