Linux设备模型分析之kobject（基于3.10.1内核）

作者：刘昊昱

博客：http://blog.csdn.net/liuhaoyutz

内核版本：3.10.1

一、kobject结构定义

kobject是Linux设备模型的最底层数据结构，它代表一个内核对象。

kobject结构体定义在include/linux/kobject.h文件中：

179/**180 *  flush_write_buffer - push buffer to kobject.181 *  @dentry:    dentry to the attribute182 *  @buffer:    data buffer for file.183 *  @count:     number of bytes184 *185 *  Get the correct pointers for the kobject and the attribute we're186 *  dealing with, then call the store() method for the attribute,187 *  passing the buffer that we acquired in fill_write_buffer().188 */189190static int191flush_write_buffer(struct dentry * dentry, struct sysfs_buffer * buffer, size_t count)192{193    struct sysfs_dirent *attr_sd = dentry->d_fsdata;194    struct kobject *kobj = attr_sd->s_parent->s_dir.kobj;195    const struct sysfs_ops * ops = buffer->ops;196    int rc;197198    /* need attr_sd for attr and ops, its parent for kobj */199    if (!sysfs_get_active(attr_sd))200        return -ENODEV;201202    rc = ops->store(kobj, attr_sd->s_attr.attr, buffer->page, count);203204    sysfs_put_active(attr_sd);205206    return rc;207}