kobj_attribute

struct kobj_attribute {
struct attribute attr;
ssize_t (*show)(struct kobject *kobj, struct kobj_attribute *attr,
char *buf);
ssize_t (*store)(struct kobject *kobj, struct kobj_attribute *attr,
const char *buf, size_t count);

};

struct attribute {
const char *name;
umode_t mode;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lock_class_key*key;
struct lock_class_keyskey;
#endif
};

const struct sysfs_ops kobj_sysfs_ops = {
.show = kobj_attr_show,
.store = kobj_attr_store,
};

/* default kobject attribute operations */
static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
     char *buf)
{
struct kobj_attribute *kattr;
ssize_t ret = -EIO;


kattr = container_of(attr, struct kobj_attribute, attr);
if (kattr->show)
ret = kattr->show(kobj, kattr, buf);
return ret;
}


static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
      const char *buf, size_t count)
{
struct kobj_attribute *kattr;
ssize_t ret = -EIO;


kattr = container_of(attr, struct kobj_attribute, attr);//定位到结构体的头部起始地址
if (kattr->store)
ret = kattr->store(kobj, kattr, buf, count);
return ret;
}

static void dynamic_kobj_release(struct kobject *kobj)
{
pr_debug("kobject: (%p): %s\n", kobj, __func__);
kfree(kobj);
}


static struct kobj_type dynamic_kobj_ktype = {
.release = dynamic_kobj_release,
.sysfs_ops = &kobj_sysfs_ops,
};

struct kobj_type {
void (*release)(struct kobject *kobj);
const struct sysfs_ops *sysfs_ops;
struct attribute **default_attrs;
const struct kobj_ns_type_operations *(*child_ns_type)(struct kobject *kobj);
const void *(*namespace)(struct kobject *kobj);
};