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/KDiskDevice.h

@@ -23,7 +23,10 @@ public:
 	KDiskDevice(partition_id id = -1);
 	virtual ~KDiskDevice();
 
+	status_t SetTo(const char *path);
+	void Unset();
 	status_t InitCheck() const;
+		// TODO: probably superfluous
 
 	// A read lock owner can be sure that the device (incl. all of its
 	// partitions won't be changed).
@@ -64,6 +67,8 @@ public:
 	team_id ShadowOwner() const;
 
 private:
+	void _InitPartitionData();
+
 	disk_device_data	fDeviceData;
 	RWLocker			fLocker;
 	int					fFD;

headers/private/kernel/disk_device_manager/KDiskDeviceManager.h

@@ -44,12 +44,13 @@ public:
 
 	KDiskDevice *RegisterDevice(const char *path, bool noShadow = true);
 	KDiskDevice *RegisterDevice(partition_id id, bool noShadow = true);
+	KDiskDevice *RegisterNextDevice(int32 *cookie);
 	KPartition *RegisterPartition(const char *path, bool noShadow = true);
 	KPartition *RegisterPartition(partition_id id, bool noShadow = true);
 
 	// manager must be locked
-	int32 CountDiskDevices();
-	KDiskDevice *DiskDeviceAt(int32 index);
+	int32 CountDevices();
+	KDiskDevice *DeviceAt(int32 index);
 
 	bool PartitionAdded(KPartition *partition);		// implementation internal
 	bool PartitionRemoved(KPartition *partition);	//
@@ -74,16 +75,24 @@ public:
 	int32 CountDiskSystems();
 	KDiskSystem *DiskSystemAt(int32 index);
 
+	KDiskSystem *LoadDiskSystem(disk_system_id id);
+	KDiskSystem *LoadNextDiskSystem(int32 *cookie);
+
 	// Watching
 
 	// TODO: Watching service for the kernel. The userland watching is handled
 	// by the registrar.
 
+	status_t InitialDeviceScan();
+
 private:
 	status_t _AddPartitioningSystem(const char *name);
 	status_t _AddFileSystem(const char *name);
 	status_t _AddDiskSystem(KDiskSystem *diskSystem);
 
+	status_t _Scan(const char *path);
+	status_t _ScanPartition(KPartition *partition);
+
 	BLocker						fLock;
 	List<KDiskDevice*>			fDevices;		// TODO: Optimize!
 	List<KPartition*>			fPartitions;	//

headers/private/kernel/disk_device_manager/KDiskSystem.h

@@ -26,6 +26,7 @@ public:
 	virtual bool IsFileSystem() const;
 	bool IsPartitioningSystem() const;
 
+	// manager will be locked
 	status_t Load();		// load/unload -- can be nested
 	void Unload();			//
 	bool IsLoaded() const;

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