partition_id
_user_find_partition(const char *_filename, size_t *neededSize)
{
UserStringParameter<false> filename;
status_t error = filename.Init(_filename, B_PATH_NAME_LENGTH);
if (error != B_OK)
return error;
KDiskDeviceManager *manager = KDiskDeviceManager::Default();
// find the partition
KPartition *partition = manager->RegisterPartition(filename);
if (partition == NULL)
return B_ENTRY_NOT_FOUND;
PartitionRegistrar _(partition, true);
partition_id id = partition->ID();
if (neededSize != NULL) {
// get and lock the partition's device
KDiskDevice *device = manager->RegisterDevice(partition->ID(), false);
if (device == NULL)
return B_ENTRY_NOT_FOUND;
PartitionRegistrar _2(device, true);
if (DeviceReadLocker locker = device) {
// get the needed size
UserDataWriter writer;
device->WriteUserData(writer);
error = copy_to_user_value(neededSize, writer.AllocatedSize());
if (error != B_OK)
return error;
} else
return B_ERROR;
}
return id;
}
status_t
_user_create_child_partition(partition_id partitionID, int32* _changeCounter,
off_t offset, off_t size, const char* _type, const char* _name,
const char* _parameters, partition_id* childID, int32* childChangeCounter)
{
// copy parameters in
UserStringParameter<false> type;
UserStringParameter<true> name;
UserStringParameter<true> parameters;
int32 changeCounter;
status_t error = type.Init(_type, B_DISK_DEVICE_TYPE_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 initialized
KDiskSystem* diskSystem = partition->DiskSystem();
if (diskSystem == NULL)
return B_BAD_VALUE;
// mark the partition busy and unlock
if (!partition->CheckAndMarkBusy(false))
return B_BUSY;
locker.Unlock();
// create the child
KPartition *child = NULL;
error = diskSystem->CreateChild(partition, offset, size, type.value,
name.value, parameters.value, DUMMY_JOB_ID, &child, -1);
// re-lock and unmark busy
locker.Lock();
partition->UnmarkBusy(false);
if (error != B_OK)
return error;
if (child == NULL)
return B_ERROR;
child->UnmarkBusy(true);
// return change counter and child ID
error = copy_to_user_value(_changeCounter, partition->ChangeCounter());
if (error == B_OK)
error = copy_to_user_value(childID, child->ID());
return error;
}
