Added notification support for the mounting and mount point moving events. Several fixes.

git-svn-id: file:///srv/svn/repos/haiku/trunk/current@2680 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/servers/registrar/DiskDeviceManager.cpp

@@ -7,30 +7,33 @@
 #include <RegistrarDefs.h>
 
 #include "DiskDeviceManager.h"
+#include "Debug.h"
+#include "EventMaskWatcher.h"
 #include "RDiskDevice.h"
 #include "RDiskDeviceList.h"
 #include "RPartition.h"
 #include "RSession.h"
-#include "Debug.h"
 
 enum {
-	REQUEST_PRIORITY		= 0,
-	NODE_MONITOR_PRIORITY	= 10,
+	REQUEST_PRIORITY			= 0,
+	NODE_MONITOR_PRIORITY		= 10,
+	WATCHING_REQUEST_PRIORITY	= 20,
 };
 
 // constructor
 DiskDeviceManager::DiskDeviceManager()
 	: BLooper("disk device manager"),
 	  fDeviceListLock(),
+	  fWatchingService(),
 	  fVolumeList(BMessenger(this), fDeviceListLock),
-	  fDeviceList(BMessenger(this), fDeviceListLock, fVolumeList),
+	  fDeviceList(BMessenger(this), fDeviceListLock, fVolumeList,
+	  			  &fWatchingService),
 	  fMessageQueue(),
 	  fWorker(-1),
 	  fMessageCounter(-1),
 	  fTerminating(false)
 {
 	// set up the device list
-	fVolumeList.Rescan();
 	fVolumeList.Dump();
 	fDeviceList.Rescan();
 	fDeviceList.Dump();
@@ -61,10 +64,14 @@ DiskDeviceManager::MessageReceived(BMessage *message)
 		case B_REG_NEXT_DISK_DEVICE:
 		case B_REG_GET_DISK_DEVICE:
 		case B_REG_UPDATE_DISK_DEVICE:
+			DetachCurrentMessage();
+			if (!_PushMessage(message, REQUEST_PRIORITY))
+				delete message;
+			break;
 		case B_REG_DEVICE_START_WATCHING:
 		case B_REG_DEVICE_STOP_WATCHING:
 			DetachCurrentMessage();
-			if (!_PushMessage(message, REQUEST_PRIORITY))
+			if (!_PushMessage(message, WATCHING_REQUEST_PRIORITY))
 				delete message;
 			break;
 		case B_NODE_MONITOR:
@@ -80,13 +87,14 @@ DiskDeviceManager::MessageReceived(BMessage *message)
 
 // _NextDiskDeviceRequest
 void
-DiskDeviceManager::_NextDiskDeviceRequest(BMessage *message)
+DiskDeviceManager::_NextDiskDeviceRequest(BMessage *request)
 {
 	FUNCTION_START();
+	Lock();
 	status_t error = B_OK;
 	int32 cookie = 0;
 	BMessage reply(B_REG_RESULT);
-	if (message->FindInt32("cookie", &cookie) == B_OK) {
+	if (request->FindInt32("cookie", &cookie) == B_OK) {
 		// get next device
 		if (RDiskDevice *device = fDeviceList.DeviceWithID(cookie, false)) {
 			// archive device
@@ -103,23 +111,25 @@ DiskDeviceManager::_NextDiskDeviceRequest(BMessage *message)
 		SET_ERROR(error, B_BAD_VALUE);
 	// add result and send reply
 	reply.AddInt32("result", error);
-	message->SendReply(&reply);
+	request->SendReply(&reply);
+	Unlock();
 }
 
 // _GetDiskDeviceRequest
 void
-DiskDeviceManager::_GetDiskDeviceRequest(BMessage *message)
+DiskDeviceManager::_GetDiskDeviceRequest(BMessage *request)
 {
+	Lock();
 	status_t error = B_ENTRY_NOT_FOUND;
 	// get the device
 	RDiskDevice *device = NULL;
 	int32 id = 0;
-	if (message->FindInt32("device_id", &id) == B_OK)
+	if (request->FindInt32("device_id", &id) == B_OK)
 		device = fDeviceList.DeviceWithID(id);
-	else if (message->FindInt32("session_id", &id) == B_OK) {
+	else if (request->FindInt32("session_id", &id) == B_OK) {
 		if (RSession *session = fDeviceList.SessionWithID(id))
 			device = session->Device();
-	} else if (message->FindInt32("partition_id", &id) == B_OK) {
+	} else if (request->FindInt32("partition_id", &id) == B_OK) {
 		if (RPartition *partition = fDeviceList.PartitionWithID(id))
 			device = partition->Device();
 	} else
@@ -134,13 +144,15 @@ DiskDeviceManager::_GetDiskDeviceRequest(BMessage *message)
 	}
 	// add result and send reply
 	reply.AddInt32("result", error);
-	message->SendReply(&reply);
+	request->SendReply(&reply);
+	Unlock();
 }
 
 // _UpdateDiskDeviceRequest
 void
-DiskDeviceManager::_UpdateDiskDeviceRequest(BMessage *message)
+DiskDeviceManager::_UpdateDiskDeviceRequest(BMessage *request)
 {
+	Lock();
 	status_t error = B_ENTRY_NOT_FOUND;
 	// get the device and check the object is up to date
 	bool upToDate = false;
@@ -148,20 +160,20 @@ DiskDeviceManager::_UpdateDiskDeviceRequest(BMessage *message)
 	int32 id = 0;
 	int32 changeCounter = 0;
 	uint32 policy = 0;
-	if (message->FindInt32("change_counter", &changeCounter) != B_OK
-		|| message->FindInt32("update_policy", (int32*)&policy) != B_OK) {
-		// bad request message
+	if (request->FindInt32("change_counter", &changeCounter) != B_OK
+		|| request->FindInt32("update_policy", (int32*)&policy) != B_OK) {
+		// bad request request
 		SET_ERROR(error, B_BAD_VALUE);
-	} else if (message->FindInt32("device_id", &id) == B_OK) {
+	} else if (request->FindInt32("device_id", &id) == B_OK) {
 		device = fDeviceList.DeviceWithID(id);
 		if (device)
 			upToDate = (device->ChangeCounter() == changeCounter);
-	} else if (message->FindInt32("session_id", &id) == B_OK) {
+	} else if (request->FindInt32("session_id", &id) == B_OK) {
 		if (RSession *session = fDeviceList.SessionWithID(id)) {
 			device = session->Device();
 			upToDate = (session->ChangeCounter() == changeCounter);
 		}
-	} else if (message->FindInt32("partition_id", &id) == B_OK) {
+	} else if (request->FindInt32("partition_id", &id) == B_OK) {
 		if (RPartition *partition = fDeviceList.PartitionWithID(id)) {
 			device = partition->Device();
 			upToDate = (partition->ChangeCounter() == changeCounter);
@@ -184,9 +196,66 @@ DiskDeviceManager::_UpdateDiskDeviceRequest(BMessage *message)
 	if (error == B_OK)
 		error = reply.AddBool("up_to_date", upToDate);
 	reply.AddInt32("result", error);
-	message->SendReply(&reply);
+	request->SendReply(&reply);
+	Unlock();
 }
 
+// _StartWatchingRequest
+void
+DiskDeviceManager::_StartWatchingRequest(BMessage *request)
+{
+	FUNCTION_START();
+	Lock();
+	status_t error = B_OK;
+	// get the parameters
+	BMessenger target;
+	uint32 events;
+	if (error == B_OK
+		&& (request->FindMessenger("target", &target) != B_OK
+			|| request->FindInt32("events", (int32*)&events) != B_OK)) {
+		SET_ERROR(error, B_BAD_VALUE);
+	}
+	// add the new watcher
+	if (error == B_OK) {
+		Watcher *watcher = new(nothrow) EventMaskWatcher(target, events);
+		if (watcher) {
+			if (!fWatchingService.AddWatcher(watcher)) {
+				SET_ERROR(error, B_NO_MEMORY);
+				delete watcher;
+			}
+		} else
+			SET_ERROR(error, B_NO_MEMORY);
+	}
+	// add result and send reply
+	BMessage reply(B_REG_RESULT);
+	reply.AddInt32("result", error);
+	request->SendReply(&reply);
+	Unlock();
+};
+
+// _StopWatchingRequest
+void
+DiskDeviceManager::_StopWatchingRequest(BMessage *request)
+{
+	FUNCTION_START();
+	Lock();
+	status_t error = B_OK;
+	// get the parameters
+	BMessenger target;
+	if (error == B_OK && request->FindMessenger("target", &target) != B_OK)
+		error = B_BAD_VALUE;
+	// remove the watcher
+	if (error == B_OK) {
+		if (!fWatchingService.RemoveWatcher(target))
+			error = B_BAD_VALUE;
+	}
+	// add result and send reply
+	BMessage reply(B_REG_RESULT);
+	reply.AddInt32("result", error);
+	request->SendReply(&reply);
+	Unlock();
+};
+
 // _PushMessage
 bool
 DiskDeviceManager::_PushMessage(BMessage *message, int32 priority)
@@ -233,7 +302,10 @@ DiskDeviceManager::_Worker()
 					_UpdateDiskDeviceRequest(message);
 					break;
 				case B_REG_DEVICE_START_WATCHING:
+					_StartWatchingRequest(message);
+					break;
 				case B_REG_DEVICE_STOP_WATCHING:
+					_StopWatchingRequest(message);
 					break;
 				case B_NODE_MONITOR:
 				{

src/servers/registrar/DiskDeviceManager.h

@@ -13,6 +13,7 @@
 #include "PriorityMessageQueue.h"
 #include "RDiskDeviceList.h"
 #include "RVolumeList.h"
+#include "WatchingService.h"
 
 class DiskDeviceManager : public BLooper {
 public:
@@ -23,9 +24,11 @@ public:
 
 private:
 	// requests
-	void _NextDiskDeviceRequest(BMessage *message);
-	void _GetDiskDeviceRequest(BMessage *message);
-	void _UpdateDiskDeviceRequest(BMessage *message);
+	void _NextDiskDeviceRequest(BMessage *request);
+	void _GetDiskDeviceRequest(BMessage *request);
+	void _UpdateDiskDeviceRequest(BMessage *request);
+	void _StartWatchingRequest(BMessage *request);
+	void _StopWatchingRequest(BMessage *request);
 
 	bool _PushMessage(BMessage *message, int32 priority);
 	BMessage *_PopMessage();
@@ -35,6 +38,7 @@ private:
 
 private:
 	BLocker					fDeviceListLock;
+	WatchingService			fWatchingService;
 	RVolumeList				fVolumeList;
 	RDiskDeviceList			fDeviceList;
 	PriorityMessageQueue	fMessageQueue;

src/servers/registrar/RDiskDevice.cpp

@@ -141,10 +141,10 @@ RDiskDevice::RemoveSession(int32 index)
 {
 	RSession *session = SessionAt(index);
 	if (session) {
-		session->SetDevice(NULL);
-		fSessions.RemoveItemAt(index);
 		if (RDiskDeviceList *deviceList = DeviceList())
 			deviceList->SessionRemoved(session);
+		session->SetDevice(NULL);
+		fSessions.RemoveItemAt(index);
 		delete session;
 	}
 	return (session != NULL);

src/servers/registrar/RDiskDeviceList.cpp

@@ -12,6 +12,7 @@
 #include <sys/stat.h>
 
 #include <Directory.h>
+#include <DiskDeviceRoster.h>
 #include <Drivers.h>
 #include <Entry.h>
 #include <Locker.h>
@@ -19,24 +20,13 @@
 
 #include "RDiskDeviceList.h"
 #include "Debug.h"
+#include "EventMaskWatcher.h"
 #include "RDiskDevice.h"
 #include "RPartition.h"
 #include "RSession.h"
+#include "WatchingService.h"
 
-// compare_ids
-/*template<typename T>
-static
-int
-compare_ids(const T *object1, const T *object2)
-{
-	int32 id1 = object1->ID();
-	int32 id2 = object2->ID();
-	if (id1 < id2)
-		return -1;
-	if (id1 > id2)
-		return 1;
-	return 0;
-}*/
+namespace RDiskDeviceListPredicates {
 
 // CompareIDPredicate
 template <typename T>
@@ -71,14 +61,36 @@ private:
 	const char	*fPath;
 };
 
+// ComparePartitionPathPredicate
+struct ComparePartitionPathPredicate : public UnaryPredicate<RPartition> {
+	ComparePartitionPathPredicate(const char *path) : fPath(path) {}
+
+	virtual int operator()(const RPartition *partition) const
+	{
+		char path[B_FILE_NAME_LENGTH];
+		partition->GetPath(path);
+		return strcmp(fPath, path);
+	}
+	
+private:
+	const char	*fPath;
+};
+
+}	// namespace RDiskDeviceListPredicates
+
+using namespace RDiskDeviceListPredicates;
+
+
 // constructor
 RDiskDeviceList::RDiskDeviceList(BMessenger target, BLocker &lock,
-								 RVolumeList &volumeList)
+								 RVolumeList &volumeList,
+								 WatchingService *watchingService)
 	: MessageHandler(),
 	  RVolumeListListener(),
 	  fLock(lock),
 	  fTarget(target),
 	  fVolumeList(volumeList),
+	  fWatchingService(watchingService),
 	  fDevices(20, true),
 	  fSessions(40, false),
 	  fPartitions(80, false)
@@ -110,6 +122,21 @@ void
 RDiskDeviceList::VolumeMounted(const RVolume *volume)
 {
 	PRINT(("RDiskDeviceList::VolumeMounted(%ld)\n", volume->ID()));
+	Lock();
+	// get the partition and set its volume
+	const char *devicePath = volume->DevicePath();
+	if (RPartition *partition = PartitionWithPath(devicePath)) {
+		partition->SetVolume(volume);
+		// send notifications
+		BMessage notification(B_DEVICE_UPDATE);
+		if (_InitNotificationMessage(&notification,
+				B_DEVICE_PARTITION_MOUNTED, B_DEVICE_CAUSE_UNKNOWN,
+				partition) == B_OK) {
+			EventMaskWatcherFilter filter(B_DEVICE_REQUEST_MOUNTING);
+			fWatchingService->NotifyWatchers(&notification, &filter);
+		}
+	}
+	Unlock();
 }
 
 // VolumeUnmounted
@@ -117,13 +144,46 @@ void
 RDiskDeviceList::VolumeUnmounted(const RVolume *volume)
 {
 	PRINT(("RDiskDeviceList::VolumeUnmounted(%ld)\n", volume->ID()));
+	Lock();
+	// get the partition and set its volume
+	const char *devicePath = volume->DevicePath();
+	if (RPartition *partition = PartitionWithPath(devicePath)) {
+		partition->SetVolume(NULL);
+		// send notifications
+		BMessage notification(B_DEVICE_UPDATE);
+		if (_InitNotificationMessage(&notification,
+				B_DEVICE_PARTITION_UNMOUNTED, B_DEVICE_CAUSE_UNKNOWN,
+				partition) == B_OK) {
+			EventMaskWatcherFilter filter(B_DEVICE_REQUEST_MOUNTING);
+			fWatchingService->NotifyWatchers(&notification, &filter);
+		}
+	}
+	Unlock();
 }
 
 // MountPointMoved
 void
-RDiskDeviceList::MountPointMoved(const RVolume *volume)
+RDiskDeviceList::MountPointMoved(const RVolume *volume,
+								 const entry_ref *oldRoot,
+								 const entry_ref *newRoot)
 {
 	PRINT(("RDiskDeviceList::MountPointMoved(%ld)\n", volume->ID()));
+	Lock();
+	// get the partition
+	const char *devicePath = volume->DevicePath();
+	if (RPartition *partition = PartitionWithPath(devicePath)) {
+		// send notifications
+		BMessage notification(B_DEVICE_UPDATE);
+		if (_InitNotificationMessage(&notification,
+				B_DEVICE_MOUNT_POINT_MOVED, B_DEVICE_CAUSE_UNKNOWN,
+				partition) == B_OK
+			&& notification.AddRef("old_directory", oldRoot) == B_OK
+			&& notification.AddRef("new_directory", newRoot) == B_OK) {
+			EventMaskWatcherFilter filter(B_DEVICE_REQUEST_MOUNT_POINT);
+			fWatchingService->NotifyWatchers(&notification, &filter);
+		}
+	}
+	Unlock();
 }
 
 // AddDevice
@@ -145,9 +205,9 @@ RDiskDeviceList::RemoveDevice(int32 index)
 {
 	RDiskDevice *device = DeviceAt(index);
 	if (device) {
+		DeviceRemoved(device);
 		device->SetDeviceList(NULL);
 		fDevices.RemoveItemAt(index);
-		DeviceRemoved(device);
 		delete device;
 	}
 	return (device != NULL);
@@ -206,6 +266,15 @@ RDiskDeviceList::DeviceWithPath(const char *path) const
 	return const_cast<RDiskDevice*>(device);
 }
 
+// PartitionWithPath
+RPartition *
+RDiskDeviceList::PartitionWithPath(const char *path) const
+{
+	const RPartition *partition
+		= fPartitions.FindIf(ComparePartitionPathPredicate(path));
+	return const_cast<RPartition*>(partition);
+}
+
 // Rescan
 status_t
 RDiskDeviceList::Rescan()
@@ -273,6 +342,8 @@ RDiskDeviceList::DeviceRemoved(RDiskDevice *device, uint32 cause)
 void
 RDiskDeviceList::SessionAdded(RSession *session, uint32 cause)
 {
+	// add the session to our list
+	fSessions.BinaryInsert(session, CompareIDPredicate<RSession>(session));
 	// propagate to partitions
 	for (int32 i = 0; RPartition *partition = session->PartitionAt(i); i++)
 		PartitionAdded(partition, B_DEVICE_CAUSE_PARENT_CHANGED);
@@ -284,6 +355,12 @@ RDiskDeviceList::SessionAdded(RSession *session, uint32 cause)
 void
 RDiskDeviceList::SessionRemoved(RSession *session, uint32 cause)
 {
+	// remove the session from our list
+	bool success = false;
+	int32 index = fSessions.FindBinaryInsertionIndex(
+		CompareIDPredicate<RSession>(session), &success);
+	if (success)
+		fSessions.RemoveItemAt(index);
 	// propagate to partitions
 	for (int32 i = 0; RPartition *partition = session->PartitionAt(i); i++)
 		PartitionRemoved(partition, B_DEVICE_CAUSE_PARENT_CHANGED);
@@ -295,6 +372,9 @@ RDiskDeviceList::SessionRemoved(RSession *session, uint32 cause)
 void
 RDiskDeviceList::PartitionAdded(RPartition *partition, uint32 cause)
 {
+	// add the partition to our list
+	fPartitions.BinaryInsert(partition,
+							 CompareIDPredicate<RPartition>(partition));
 	// get the corresponding volume, if partition is mounted
 	char path[B_FILE_NAME_LENGTH];
 	partition->GetPath(path);
@@ -308,6 +388,12 @@ RDiskDeviceList::PartitionAdded(RPartition *partition, uint32 cause)
 void
 RDiskDeviceList::PartitionRemoved(RPartition *partition, uint32 cause)
 {
+	// remove the partition from our list
+	bool success = false;
+	int32 index = fPartitions.FindBinaryInsertionIndex(
+		CompareIDPredicate<RPartition>(partition), &success);
+	if (success)
+		fPartitions.RemoveItemAt(index);
 	// notifications
 	// ...
 }
@@ -393,3 +479,64 @@ RDiskDeviceList::_ScanDevice(const char *path)
 	return error;
 }
 
+// _InitNotificationMessage
+status_t
+RDiskDeviceList::_InitNotificationMessage(BMessage *message, uint32 event,
+										  uint32 cause)
+{
+	status_t error = (message ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		message->what = B_DEVICE_UPDATE;
+		error = message->AddInt32("event", event);
+	}
+	if (error == B_OK)
+		error = message->AddInt32("cause", cause);
+	return error;
+}
+
+// _InitNotificationMessage
+status_t
+RDiskDeviceList::_InitNotificationMessage(BMessage *message, uint32 event,
+										  uint32 cause,
+										  const RDiskDevice *device)
+{
+	status_t error = (device ? B_OK : B_BAD_VALUE);
+	if (error == B_OK)
+		error = _InitNotificationMessage(message, event, cause);
+	if (error == B_OK)
+		error = message->AddInt32("device_id", device->ID());
+	return error;
+}
+
+// _InitNotificationMessage
+status_t
+RDiskDeviceList::_InitNotificationMessage(BMessage *message, uint32 event,
+										  uint32 cause,
+										  const RSession *session)
+{
+	status_t error = (session ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		error = _InitNotificationMessage(message, event, cause,
+										 session->Device());
+	}
+	if (error == B_OK)
+		error = message->AddInt32("session_id", session->ID());
+	return error;
+}
+
+// _InitNotificationMessage
+status_t
+RDiskDeviceList::_InitNotificationMessage(BMessage *message, uint32 event,
+										  uint32 cause,
+										  const RPartition *partition)
+{
+	status_t error = (partition ? B_OK : B_BAD_VALUE);
+	if (error == B_OK) {
+		error = _InitNotificationMessage(message, event, cause,
+										 partition->Session());
+	}
+	if (error == B_OK)
+		error = message->AddInt32("partition_id", partition->ID());
+	return error;
+}
+

src/servers/registrar/RDiskDeviceList.h

@@ -19,6 +19,7 @@ class BLocker;
 class RDiskDevice;
 class RPartition;
 class RSession;
+class WatchingService;
 
 // device list modification causes
 // TODO: to be moved to <DiskDeviceRoster.h>
@@ -36,14 +37,17 @@ enum {
 
 class RDiskDeviceList : public MessageHandler, public RVolumeListListener {
 public:
-	RDiskDeviceList(BMessenger target, BLocker &lock, RVolumeList &volumeList);
+	RDiskDeviceList(BMessenger target, BLocker &lock, RVolumeList &volumeList,
+					WatchingService *watchingService);
 	~RDiskDeviceList();
 
 	virtual void HandleMessage(BMessage *message);
 
 	virtual void VolumeMounted(const RVolume *volume);
 	virtual void VolumeUnmounted(const RVolume *volume);
-	virtual void MountPointMoved(const RVolume *volume);
+	virtual void MountPointMoved(const RVolume *volume,
+								 const entry_ref *oldRoot,
+								 const entry_ref *newRoot);
 
 	bool AddDevice(RDiskDevice *device);
 	bool RemoveDevice(int32 index);
@@ -63,6 +67,7 @@ public:
 	RPartition *PartitionWithID(int32 id) const;
 
 	RDiskDevice *DeviceWithPath(const char *path) const;
+	RPartition *PartitionWithPath(const char *path) const;
 
 	status_t Rescan();
 
@@ -88,10 +93,21 @@ private:
 	status_t _Scan(BDirectory &dir);
 	status_t _ScanDevice(const char *path);
 
+	status_t _InitNotificationMessage(BMessage *message, uint32 event,
+									  uint32 cause);
+	status_t _InitNotificationMessage(BMessage *message, uint32 event,
+									  uint32 cause, const RDiskDevice *device);
+	status_t _InitNotificationMessage(BMessage *message, uint32 event,
+									  uint32 cause, const RSession *session);
+	status_t _InitNotificationMessage(BMessage *message, uint32 event,
+									  uint32 cause,
+									  const RPartition *partition);
+
 private:
 	mutable BLocker				&fLock;
 	BMessenger					fTarget;
 	RVolumeList					&fVolumeList;
+	WatchingService				*fWatchingService;
 	BObjectList<RDiskDevice>	fDevices;		// sorted by ID
 	BObjectList<RSession>		fSessions;		//
 	BObjectList<RPartition>		fPartitions;	//

src/servers/registrar/RSession.cpp

@@ -109,10 +109,10 @@ RSession::RemovePartition(int32 index)
 {
 	RPartition *partition = PartitionAt(index);
 	if (partition) {
-		partition->SetSession(NULL);
-		fPartitions.RemoveItemAt(index);
 		if (RDiskDeviceList *deviceList = DeviceList())
 			deviceList->PartitionRemoved(partition);
+		partition->SetSession(NULL);
+		fPartitions.RemoveItemAt(index);
 		delete partition;
 	}
 	return (partition != NULL);

src/servers/registrar/RVolumeList.cpp

@@ -5,14 +5,19 @@
 
 #include <string.h>
 
+#include <Directory.h>
+#include <Entry.h>
 #include <Locker.h>
 #include <Message.h>
 #include <NodeMonitor.h>
+#include <Path.h>
 #include <Volume.h>
 
 #include "RVolumeList.h"
 #include "Debug.h"
 
+namespace RVolumeListPredicates {
+
 // CompareIDPredicate
 struct CompareIDPredicate : public UnaryPredicate<RVolume> {
 	CompareIDPredicate(dev_t id) : fID(id) {}
@@ -45,13 +50,18 @@ private:
 	const char	*fPath;
 };
 
+}	// namespace RVolumeListPredicates
+
+using namespace RVolumeListPredicates;
+
 
 // RVolume
 
 // constructor
 RVolume::RVolume()
 	: fID(-1),
-	  fRootNode(-1)
+	  fRootNode(-1),
+	  fRootEntry()
 {
 }
 
@@ -60,13 +70,31 @@ status_t
 RVolume::SetTo(dev_t id)
 {
 	status_t error = B_OK;
+	// get general info
 	fs_info info;
 	error = fs_stat_dev(id, &info);
 	if (error == B_OK) {
 		fID = id;
 		fRootNode = info.root;
-		strcpy(fDevicePath, info.device_name);
-	} else
+		if (info.device_name[0] != '\0')
+			strcpy(fDevicePath, info.device_name);
+		else	// generate a pseudo name -- needed for the list
+			sprintf(fDevicePath, "%ld", id);
+	}
+	// get root dir entry_ref
+	if (error == B_OK) {
+		node_ref ref;
+		GetRootDirNode(&ref);
+		BDirectory dir;
+		error = dir.SetTo(&ref);
+		BEntry entry;
+		if (error == B_OK)
+			error = dir.GetEntry(&entry);
+		if (error == B_OK)
+			error = entry.GetRef(&fRootEntry);
+	}
+	// cleanup on error
+	if (error != B_OK)
 		Unset();
 	return error;
 }
@@ -126,7 +154,9 @@ RVolumeListListener::VolumeUnmounted(const RVolume *volume)
 
 // MountPointMoved
 void
-RVolumeListListener::MountPointMoved(const RVolume *volume)
+RVolumeListListener::MountPointMoved(const RVolume *volume,
+									 const entry_ref *oldRoot,
+									 const entry_ref *newRoot)
 {
 }
 
@@ -194,12 +224,15 @@ RVolumeList::HandleMessage(BMessage *message)
 status_t
 RVolumeList::Rescan()
 {
-	fVolumes.MakeEmpty();
+PRINT(("RVolumeList::Rescan()\n"));
+	for (int32 i = fVolumes.CountItems() - 1; i >= 0; i--)
+		_RemoveVolumeAt(i);
 	fRoster.Rewind();
 	BVolume bVolume;
 	while (fRoster.GetNextVolume(&bVolume) == B_OK)
 		_AddVolume(bVolume.Device());
-	return B_ERROR;
+PRINT(("RVolumeList::Rescan() done\n"));
+	return B_OK;
 }
 
 // VolumeForDevicePath
@@ -272,6 +305,18 @@ RVolumeList::_AddVolume(dev_t id)
 	return volume;
 }
 
+// _RemoveVolumeAt
+bool
+RVolumeList::_RemoveVolumeAt(int32 index)
+{
+	bool result = false;
+	if (RVolume *volume = fVolumes.RemoveItemAt(index)) {
+		volume->StopWatching(fTarget);
+		delete volume;
+	}
+	return result;
+}
+
 // _DeviceMounted
 void
 RVolumeList::_DeviceMounted(BMessage *message)
@@ -307,12 +352,33 @@ RVolumeList::_DeviceUnmounted(BMessage *message)
 void
 RVolumeList::_MountPointMoved(BMessage *message)
 {
+	// Note: The "device" field of the message refers to the device of the
+	// parent directory. Therefore we need to get an entry_ref, turn it into
+	// a path and get the device for that path.
+	// get the message fields
 	dev_t device;
-	if (message->FindInt32("device", &device) == B_OK) {
-		PRINT(("RVolumeList::_MountPointMoved(%ld)\n", device));
-		if (RVolume *volume = fVolumes.FindIf(CompareIDPredicate(device))) {
-			if (fListener)
-				fListener->MountPointMoved(volume);
+	ino_t directory;
+	const char *name;
+	if (message->FindInt32("device", &device) == B_OK
+		&& message->FindInt64("to directory", &directory) == B_OK
+		&& message->FindString("name", &name) == B_OK) {
+		// init an entry_ref
+		entry_ref ref;
+		ref.device = device;
+		ref.directory = directory;
+		ref.set_name(name);
+		// get the path and the device for that path
+		BPath path;
+		if (path.SetTo(&ref) == B_OK
+			&& (device = dev_for_path(path.Path())) >= 0) {
+			PRINT(("RVolumeList::_MountPointMoved(%ld)\n", device));
+			if (RVolume *volume = fVolumes.FindIf(CompareIDPredicate(device))) {
+				entry_ref oldRoot;
+				volume->GetRootDirEntry(&oldRoot);
+				volume->SetRootDirEntry(&ref);
+				if (fListener)
+					fListener->MountPointMoved(volume, &oldRoot, &ref);
+			}
 		}
 	}
 }

src/servers/registrar/RVolumeList.h

@@ -6,6 +6,7 @@
 #ifndef VOLUME_LIST_H
 #define VOLUME_LIST_H
 
+#include <Entry.h>
 #include <Messenger.h>
 #include <Node.h>
 #include <ObjectList.h>
@@ -26,17 +27,21 @@ public:
 
 	dev_t ID() const { return fID; }
 	ino_t RootNode() const { return fRootNode; }
-	void GetRootNodeRef(node_ref *ref) const
+	void GetRootDirNode(node_ref *ref) const
 		{ ref->device = fID; ref->node = fRootNode; }
+	void GetRootDirEntry(entry_ref *ref) const { *ref = fRootEntry; }
 	const char *DevicePath() const { return fDevicePath; }
 
+	void SetRootDirEntry(const entry_ref *ref) { fRootEntry = *ref; }
+
 	status_t StartWatching(BMessenger target) const;
 	status_t StopWatching(BMessenger target) const;
 
 private:
-	dev_t	fID;
-	ino_t	fRootNode;
-	char	fDevicePath[B_FILE_NAME_LENGTH];
+	dev_t		fID;
+	ino_t		fRootNode;
+	entry_ref	fRootEntry;
+	char		fDevicePath[B_FILE_NAME_LENGTH];
 };
 
 // RVolumeListListener
@@ -47,7 +52,9 @@ public:
 
 	virtual void VolumeMounted(const RVolume *volume);
 	virtual void VolumeUnmounted(const RVolume *volume);
-	virtual void MountPointMoved(const RVolume *volume);
+	virtual void MountPointMoved(const RVolume *volume,
+								 const entry_ref *oldRoot,
+								 const entry_ref *newRoot);
 };
 
 // RVolumeList
@@ -71,6 +78,7 @@ public:
 
 private:
 	RVolume *_AddVolume(dev_t id);
+	bool _RemoveVolumeAt(int32 index);
 	void _DeviceMounted(BMessage *message);
 	void _DeviceUnmounted(BMessage *message);
 	void _MountPointMoved(BMessage *message);