Implemented a preliminary disk device scanning in KDiskDeviceManager.

Some changes to KPartition, KDiskDevice, KDiskSystem on this way.
Still missing is KPartition::Publish() and its invocation in
KDiskDeviceManager. Then everything should be in place to start with
porting the scanning parts of our disk system modules.


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@3486 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/disk_device_manager/KPartition.h

@@ -139,6 +139,9 @@ public:
 	KDiskSystem *DiskSystem() const;
 	void SetParentDiskSystem(KDiskSystem *diskSystem);
 	KDiskSystem *ParentDiskSystem() const;
+		// When setting a disk system, it must already be loaded.
+		// The partition will load it too, hence it won't be unloaded before
+		// it is unset here.
 
 	void SetCookie(void *cookie);
 	void *Cookie() const;
@@ -148,6 +151,7 @@ public:
 
 private:
 	void _UpdateChildIndices(int32 index);
+	static int32 _NextID();
 
 protected:
 	partition_data		fPartitionData;
@@ -157,6 +161,7 @@ protected:
 	KDiskSystem			*fDiskSystem;
 	KDiskSystem			*fParentDiskSystem;
 	int32				fReferenceCount;
+	static int32		fNextID;
 };
 
 } // namespace DiskDevice