status_t
_user_initialize_partition(partition_id partitionID, int32* _changeCounter,
const char* _diskSystemName, const char* _name, const char* _parameters)
{
// copy parameters in
UserStringParameter<false> diskSystemName;
UserStringParameter<true> name;
UserStringParameter<true> parameters;
int32 changeCounter;
status_t error
= diskSystemName.Init(_diskSystemName, B_DISK_SYSTEM_NAME_LENGTH);
if (error == B_OK)
error = name.Init(_name, B_DISK_DEVICE_NAME_LENGTH);
if (error == B_OK)
error = parameters.Init(_parameters, B_DISK_DEVICE_MAX_PARAMETER_SIZE);
if (error == B_OK)
error = copy_from_user_value(changeCounter, _changeCounter);
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);
// check change counter
if (changeCounter != partition->ChangeCounter())
return B_BAD_VALUE;
// the partition must be uninitialized
if (partition->DiskSystem() != NULL)
return B_BAD_VALUE;
// load the new disk system
KDiskSystem *diskSystem = manager->LoadDiskSystem(diskSystemName.value,
true);
if (diskSystem == NULL)
return B_ENTRY_NOT_FOUND;
DiskSystemLoader loader(diskSystem, true);
// mark the partition busy and unlock
if (!partition->CheckAndMarkBusy(true))
return B_BUSY;
locker.Unlock();
// let the disk system initialize the partition
error = diskSystem->Initialize(partition, name.value, parameters.value,
DUMMY_JOB_ID);
// re-lock and unmark busy
locker.Lock();
partition->UnmarkBusy(true);
if (error != B_OK)
return error;
// Set the disk system. Re-check whether a disk system is already set on the
// partition. Some disk systems just write the on-disk structures and let
// the DDM rescan the partition, in which case the disk system will already
// be set. In very unfortunate cases the on-disk structure of the previous
// disk system has not been destroyed and the previous disk system has a
// higher priority than the new one. The old disk system will thus prevail.
// Not setting the new disk system will at least prevent that the partition
// object gets into an inconsistent state.
if (partition->DiskSystem() == NULL)
partition->SetDiskSystem(diskSystem);
// return change counter
return copy_to_user_value(_changeCounter, partition->ChangeCounter());
}
