C++ (Cpp) kernfs_rename Examples

Example #1

File: cgroup-v1.c Project: AlexShiLucky/linux

/*
 * cgroup_rename - Only allow simple rename of directories in place.
 */
static int cgroup1_rename(struct kernfs_node *kn, struct kernfs_node *new_parent,
			  const char *new_name_str)
{
	struct cgroup *cgrp = kn->priv;
	int ret;

	if (kernfs_type(kn) != KERNFS_DIR)
		return -ENOTDIR;
	if (kn->parent != new_parent)
		return -EIO;

	/*
	 * We're gonna grab cgroup_mutex which nests outside kernfs
	 * active_ref.  kernfs_rename() doesn't require active_ref
	 * protection.  Break them before grabbing cgroup_mutex.
	 */
	kernfs_break_active_protection(new_parent);
	kernfs_break_active_protection(kn);

	mutex_lock(&cgroup_mutex);

	ret = kernfs_rename(kn, new_parent, new_name_str);
	if (!ret)
		TRACE_CGROUP_PATH(rename, cgrp);

	mutex_unlock(&cgroup_mutex);

	kernfs_unbreak_active_protection(kn);
	kernfs_unbreak_active_protection(new_parent);
	return ret;
}

Example #2

File: dslabfs.c Project: wangxiaoq/dslabfs

static int dslab_rename(struct kernfs_node *kn, 
					struct kernfs_node *new_parent,
					const char *new_name_str)
{
	int ret = 0;	

	if (kernfs_type(kn) != KERNFS_DIR)
		return -ENOTDIR;
	if (kn->parent != new_parent)
		return -EIO;

	kernfs_break_active_protection(new_parent);
	kernfs_break_active_protection(kn);
	ret = kernfs_rename(kn, new_parent, new_name_str);
	kernfs_unbreak_active_protection(kn);
	kernfs_unbreak_active_protection(new_parent);

	return ret;
}