* Reimplemented BDiskDevice::IsModified()/

{Prepare,Commit,Cancel}Modifications() using the userland add-on
  backend. IsModified() and CommitModifications() are little more than
  stubs ATM.
* Made BPartition::VisitEachChild()/VisitEachDescendant() const.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22602 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/storage/Partition.h

@@ -76,9 +76,10 @@ public:
 			status_t			GetPartitioningInfo(
 									BPartitioningInfo* info) const;
 	
-			BPartition*			VisitEachChild(BDiskDeviceVisitor* visitor);
+			BPartition*			VisitEachChild(BDiskDeviceVisitor* visitor)
+									const;
 	virtual BPartition*			VisitEachDescendant(
-									BDiskDeviceVisitor* visitor);
+									BDiskDeviceVisitor* visitor) const;
 
 	// Self Modification
 
@@ -205,6 +206,11 @@ private:
 			bool				_SupportsChildOperation(const BPartition* child,
 									uint32 flag) const;
 
+			status_t			_CreateDelegates();
+			status_t			_InitDelegates();
+			void				_DeleteDelegates();
+			bool				_IsModified() const;
+
 			friend class BDiskDevice;
 			friend class BDiskSystem;
 			friend class BMutablePartition;

src/kits/storage/DiskDevice.cpp

@@ -188,8 +188,22 @@ BDiskDevice::GetPath(BPath* path) const
 bool
 BDiskDevice::IsModified() const
 {
-	return (InitCheck() == B_OK && _IsShadow()
-		&& _kern_is_disk_device_modified(ID()));
+	if (InitCheck() != B_OK)
+		return false;
+
+	struct IsModifiedVisitor : public BDiskDeviceVisitor {
+		virtual bool Visit(BDiskDevice *device)
+		{
+			return Visit(device, 0);
+		}
+		
+		virtual bool Visit(BPartition *partition, int32 level)
+		{
+			return partition->_IsModified();
+		}
+	} visitor;
+
+	return (VisitEachDescendant(&visitor) != NULL);
 }
 
 
@@ -209,20 +223,19 @@ BDiskDevice::PrepareModifications()
 	status_t error = InitCheck();
 	if (error != B_OK)
 		return error;
-	if (_IsShadow())
-		return B_ERROR;
+	if (fDelegate)
+		return B_BAD_VALUE;
 
-	// ask kernel to prepare for modifications
-	error = _kern_prepare_disk_device_modifications(ID());
+	// recursively create the delegates
+	error = _CreateDelegates();
+
+	// init them
+	if (error == B_OK)
+		error = _InitDelegates();
+
+	// delete all of them, if something went wrong
 	if (error != B_OK)
-		return error;
-
-	// update
-	error = _Update(true, NULL);
-	if (error != B_OK) {
-		// bad -- cancelling the modifications is all we can do
-		_kern_cancel_disk_device_modifications(ID());
-	}
+		_DeleteDelegates();
 
 	return error;
 }
@@ -242,15 +255,14 @@ BDiskDevice::CommitModifications(bool synchronously,
 	status_t error = InitCheck();
 	if (error != B_OK)
 		return error;
-	if (!_IsShadow())
+
+	if (!fDelegate)
 		return B_BAD_VALUE;
 
-	// TODO: Get port and token from the progressMessenger
-	// TODO: Respect "synchronously"!
-	port_id port = -1;
-	int32 token = -1;
-	error = _kern_commit_disk_device_modifications(ID(), port, token,
-		receiveCompleteProgressUpdates);
+	// TODO: Implement!
+
+	_DeleteDelegates();
+
 	if (error == B_OK)
 		error = _SetTo(ID(), true, false, 0);
 
@@ -269,10 +281,12 @@ BDiskDevice::CancelModifications()
 	status_t error = InitCheck();
 	if (error != B_OK)
 		return error;
-	if (!_IsShadow())
+
+	if (!fDelegate)
 		return B_BAD_VALUE;
 
-	error = _kern_cancel_disk_device_modifications(ID());
+	_DeleteDelegates();
+
 	if (error == B_OK)
 		error = _SetTo(ID(), true, false, 0);
 
@@ -317,8 +331,7 @@ BDiskDevice::_GetData(partition_id id, bool deviceOnly, bool shadow,
 	status_t error = B_OK;
 	do {
 		error = _kern_get_disk_device_data(id, deviceOnly, shadow,
-										   (user_disk_device_data*)buffer,
-										   bufferSize, &neededSize);
+			(user_disk_device_data*)buffer, bufferSize, &neededSize);
 		if (error == B_BUFFER_OVERFLOW) {
 			// buffer to small re-allocate it
 			if (buffer)

src/kits/storage/Partition.cpp

@@ -641,7 +641,7 @@ BPartition::GetPartitioningInfo(BPartitioningInfo* info) const
 
 // VisitEachChild
 BPartition*
-BPartition::VisitEachChild(BDiskDeviceVisitor* visitor)
+BPartition::VisitEachChild(BDiskDeviceVisitor* visitor) const
 {
 	if (visitor) {
 		int32 level = _Level();
@@ -656,10 +656,10 @@ BPartition::VisitEachChild(BDiskDeviceVisitor* visitor)
 
 // VisitEachDescendant
 BPartition*
-BPartition::VisitEachDescendant(BDiskDeviceVisitor* visitor)
+BPartition::VisitEachDescendant(BDiskDeviceVisitor* visitor) const
 {
 	if (visitor)
-		return _VisitEachDescendant(visitor);
+		return const_cast<BPartition*>(this)->_VisitEachDescendant(visitor);
 	return NULL;
 }
 
@@ -1500,3 +1500,85 @@ BPartition::_SupportsChildOperation(const BPartition* child, uint32 flag) const
 	return supported & flag;
 }
 
+
+// _CreateDelegates
+status_t
+BPartition::_CreateDelegates()
+{
+	if (fDelegate || !fPartitionData)
+		return B_BAD_VALUE;
+
+	// create and init delegate
+	fDelegate = new(nothrow) Delegate(this);
+	if (!fDelegate)
+		return B_NO_MEMORY;
+
+	status_t error = fDelegate->InitHierarchy(fPartitionData,
+		fParent ? fParent->fDelegate : NULL);
+	if (error != B_OK)
+		return error;
+
+	// create child delegates
+	int32 count = fPartitionData->child_count;
+	for (int32 i = 0; i < count; i++) {
+		BPartition* child = (BPartition*)fPartitionData->children[i]->user_data;
+		error = child->_CreateDelegates();
+		if (error != B_OK)
+			return error;
+	}
+
+	return B_OK;
+}
+
+
+// _InitDelegates
+status_t
+BPartition::_InitDelegates()
+{
+	// init delegate
+	status_t error = fDelegate->InitAfterHierarchy();
+	if (error != B_OK)
+		return error;
+
+	// recursively init child delegates
+	int32 count = CountChildren();
+	for (int32 i = 0; i < count; i++) {
+		error = ChildAt(i)->_InitDelegates();
+		if (error != B_OK)
+			return error;
+	}
+
+	return B_OK;
+}
+
+
+// _DeleteDelegates
+void
+BPartition::_DeleteDelegates()
+{
+	// recursively delete child delegates
+	int32 count = CountChildren();
+	for (int32 i = count - 1; i >= 0; i--)
+		ChildAt(i)->_DeleteDelegates();
+
+	// delete delegate
+	delete fDelegate;
+	fDelegate = NULL;
+
+	// Commit suicide, if the delegate was our only link to reality (i.e.
+	// there's no physically existing partition we represent).
+	if (fPartitionData == NULL)
+		delete this;
+}
+
+
+// _IsModified
+bool
+BPartition::_IsModified() const
+{
+	if (!fDelegate)
+		return false;
+
+	// TODO: Implement!
+	return false;
+}