status_t
_user_uninitialize_partition(partition_id partitionID, int32* _changeCounter,
partition_id parentID, int32* _parentChangeCounter)
{
// copy parameters in
int32 changeCounter;
int32 parentChangeCounter;
bool haveParent = parentID >= 0;
status_t error = copy_from_user_value(changeCounter, _changeCounter);
if (haveParent && error == B_OK)
error = copy_from_user_value(parentChangeCounter, _parentChangeCounter);
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 parent
KPartition* parent = NULL;
if (haveParent)
parent = manager->RegisterPartition(parentID);
PartitionRegistrar registrar3(parent, true);
// check change counter
if (changeCounter != partition->ChangeCounter())
return B_BAD_VALUE;
if (haveParent && parentChangeCounter != parent->ChangeCounter())
return B_BAD_VALUE;
// the partition must be initialized
if (partition->DiskSystem() == NULL)
return B_BAD_VALUE;
// check busy
if (!partition->CheckAndMarkBusy(true))
return B_BUSY;
if (partition->IsMounted() || partition->IsChildMounted())
return B_BAD_VALUE;
KDiskSystem* diskSystem = partition->DiskSystem();
locker.Unlock();
// Let the disk system uninitialize the partition. This operation is not
// mandatory. If implemented, it will destroy the on-disk structures, so
// that the disk system cannot accidentally identify the partition later on.
if (diskSystem != NULL)
diskSystem->Uninitialize(partition, DUMMY_JOB_ID);
// re-lock and uninitialize the partition object
locker.Lock();
error = partition->UninitializeContents(true);
partition->UnmarkBusy(true);
if (error != B_OK)
return error;
// return change counter
error = copy_to_user_value(_changeCounter, partition->ChangeCounter());
if (haveParent && error == B_OK)
error = copy_to_user_value(_parentChangeCounter, parent->ChangeCounter());
return error;
}
