Ejemplos de KPartition::ContentSize en C++ (Cpp)

Ejemplo n.º 1

Archivo: ddm_userland_interface.cpp Proyecto: looncraz/haiku

status_t
_user_resize_partition(partition_id partitionID, int32* _changeCounter,
	partition_id childID, int32* _childChangeCounter, off_t size,
	off_t contentSize)
{
	// copy parameters in
	int32 changeCounter;
	int32 childChangeCounter;

	status_t error = copy_from_user_value(changeCounter, _changeCounter);
	if (error == B_OK)
		error = copy_from_user_value(childChangeCounter, _childChangeCounter);
	if (error != B_OK)
		return error;

	// get the partition
	KDiskDeviceManager* manager = KDiskDeviceManager::Default();
	KPartition* partition = manager->WriteLockPartition(partitionID);
	if (partition == NULL)
		return B_ENTRY_NOT_FOUND;

	PartitionRegistrar registrar1(partition, true);
	PartitionRegistrar registrar2(partition->Device(), true);
	DeviceWriteLocker locker(partition->Device(), true);

	// register child
	KPartition* child = manager->RegisterPartition(childID);
	if (child == NULL)
		return B_ENTRY_NOT_FOUND;

	PartitionRegistrar registrar3(child, true);

	// check change counters
	if (changeCounter != partition->ChangeCounter()
		|| childChangeCounter != child->ChangeCounter()) {
		return B_BAD_VALUE;
	}

	// the partition must be initialized
	KDiskSystem* diskSystem = partition->DiskSystem();
	if (diskSystem == NULL)
		return B_BAD_VALUE;

	// child must indeed be a child of partition
	if (child->Parent() != partition)
		return B_BAD_VALUE;

	// check sizes
	if (size < 0 || contentSize < 0 || size < contentSize
		|| size > partition->ContentSize()) {
		return B_BAD_VALUE;
	}

	// mark the partitions busy and unlock
	if (partition->IsBusy() || child->IsBusy())
		return B_BUSY;
	partition->SetBusy(true);
	child->SetBusy(true);
	locker.Unlock();

	// resize contents first, if shrinking
	if (child->DiskSystem() && contentSize < child->ContentSize())
		error = child->DiskSystem()->Resize(child, contentSize, DUMMY_JOB_ID);

	// resize the partition
	if (error == B_OK && size != child->Size())
		error = diskSystem->ResizeChild(child, size, DUMMY_JOB_ID);

	// resize contents last, if growing
	if (error == B_OK && child->DiskSystem()
		&& contentSize > child->ContentSize()) {
		error = child->DiskSystem()->Resize(child, contentSize, DUMMY_JOB_ID);
	}

	// re-lock and unmark busy
	locker.Lock();
	partition->SetBusy(false);
	child->SetBusy(false);

	if (error != B_OK)
		return error;

	// return change counters
	error = copy_to_user_value(_changeCounter, partition->ChangeCounter());
	if (error == B_OK)
		error = copy_to_user_value(_childChangeCounter, child->ChangeCounter());
	return error;
}