* RescanDiskSystems() now locks the disk device manager, as it clobbers the

disk system lists.
* Added module watching; on module changes, it will now automatically rescan
  the disk systems.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26368 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/disk_device_manager/KDiskDeviceManager.h

@@ -102,6 +102,7 @@ private:
 	struct DiskSystemMap;
 	struct PartitionMap;
 	struct PartitionSet;
+	class DiskSystemWatcher;
 	class DeviceWatcher;
 
 	static status_t _CheckMediaStatusDaemon(void* self);
@@ -132,6 +133,7 @@ private:
 	PartitionSet				*fObsoletePartitions;
 	thread_id					fMediaChecker;
 	volatile bool				fTerminating;
+	DiskSystemWatcher			*fDiskSystemWatcher;
 	DeviceWatcher				*fDeviceWatcher;
 
 	static KDiskDeviceManager	*sDefaultManager;