Implemented Do(). Looks like it works.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@4847 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/core/disk_device_manager/jobs/KUninitializeJob.cpp

@@ -3,6 +3,11 @@
 #include <stdio.h>
 
 #include <DiskDeviceDefs.h>
+#include <KDiskDevice.h>
+#include <KDiskDeviceManager.h>
+#include <KDiskDeviceUtils.h>
+#include <KPartition.h>
+#include <KPartitionVisitor.h>
 
 #include "KUninitializeJob.h"
 
@@ -27,8 +32,44 @@ KUninitializeJob::~KUninitializeJob()
 status_t
 KUninitializeJob::Do()
 {
-// TODO: implement
+DBG(OUT("KUninitializeJob::Do(%ld)\n", PartitionID()));
-	DBG(OUT("KUninitializeJob::Do(%ld)\n", PartitionID()));
+	// get the partition
+	KDiskDeviceManager *manager = KDiskDeviceManager::Default();
+	if (KPartition *partition = manager->WriteLockPartition(PartitionID())) {
+		PartitionRegistrar registrar1(partition, true);
+		PartitionRegistrar registrar2(partition->Device(), true);
+		DeviceWriteLocker locker(partition->Device(), true);
+		// the partition's descendants must not be mounted
+		struct IsMountedVisitor : KPartitionVisitor {
+			virtual bool VisitPre(KPartition *partition)
+			{
+				return partition->IsMounted();
+			}
+		} isMountedVisitor;
+		if (partition->VisitEachDescendant(&isMountedVisitor)) {
+			SetErrorMessage("Can't uninitialize mounted partition.");
+			return B_ERROR;
+		}
+		// all descendants should be marked busy/descendant busy
+		struct IsNotBusyVisitor : KPartitionVisitor {
+			virtual bool VisitPre(KPartition *partition)
+			{
+				return !(partition->IsBusy() || partition->IsDescendantBusy());
+			}
+		} isNotBusyVisitor;
+		if (partition->VisitEachDescendant(&isNotBusyVisitor)) {
+			SetErrorMessage("Can't uninitialize non-busy partition!");
+			return B_ERROR;
+		}
+		// things look good: uninitialize the thing
+		status_t error = partition->UninitializeContents();
+		if (error != B_OK)
+			SetErrorMessage("Failed to uninitialize partition contents!");
+		return error;
+	} else {
+		SetErrorMessage("Couldn't find partition.");
+		return B_ENTRY_NOT_FOUND;
+	}
 	return B_OK;
 }