C++ (Cpp) kernfs_create_root примеры использования

Пример #1

/*! 2017. 1.07 study -ing */
int __init sysfs_init(void)
{
	int err;

	sysfs_root = kernfs_create_root(NULL, NULL);
	if (IS_ERR(sysfs_root))
		return PTR_ERR(sysfs_root);

	sysfs_root_kn = sysfs_root->kn;

	err = register_filesystem(&sysfs_fs_type);
	if (err) {
		kernfs_destroy_root(sysfs_root);
		return err;
	}

	return 0;
}

Пример #2

Файл: dslabfs.c Проект: wangxiaoq/dslabfs

static struct dentry *dslab_mount(struct file_system_type *fs_type, 
				int flags, const char *unused_dev_name, 
				void *data)
{
	struct dentry *dentry = NULL;
	struct kernfs_root *kf_root;
	struct kernfs_node *kn;
	bool new_sb;

	kf_root = kernfs_create_root(&dslab_kf_syscall_ops,
							KERNFS_ROOT_CREATE_DEACTIVATED,
							NULL);	

	if (IS_ERR(kf_root))
		goto out;

	kn = __kernfs_create_file(kf_root->kn, "dslab", FS_MODE,
							0, &dslab_kernfs_ops, NULL, NULL,
							NULL);

	if (IS_ERR(kn))
		goto destroy_root;

	dentry = kernfs_mount(fs_type, flags, kf_root,
						FS_MAGIC, &new_sb);

	if (IS_ERR(dentry) || !new_sb)
		goto destroy_kn;

	kernfs_activate(kf_root->kn);	

	goto out;

destroy_kn:
	kernfs_remove_by_name(kf_root->kn, "dslab");

destroy_root:
	kernfs_destroy_root(kf_root);
	kf_root = NULL;

out:
	return dentry;
}