about HandleCount and PointerCount for the fileobject

NTFSD
1

If I call DuplicateHandle in Win32,the HandleCount for the FileObject will
increase,right?And the PointerCount for the FileObject will increase
too,right?

If I call CreateFileMapping in Win32,the HandleCount for the FileObject will
increase,right?And the PointerCount for the FileObject will increase
too,right?

If I call MapViewOfFile,the HandleCount for the FileObject will
increase,right?And the PointerCount for the FileObject will increase
too,right?

2

> If I call DuplicateHandle in Win32,the HandleCount for the FileObject will

increase,right?

Yes.

And the PointerCount for the FileObject will increase
too,right?

No.

If I call CreateFileMapping in Win32,the HandleCount for the FileObject will
increase,right?And the PointerCount for the FileObject will increase
too,right?

Only the PointerCount, since the control area holds a PFILE_OBJECT. Note: if
the file is cached, then the control area is already created inside
CcInitializeCacheMap, and mapping a file will only addref the control area, and
not the FILE_OBJECT.

If I call MapViewOfFile,the HandleCount for the FileObject will
increase,right?And the PointerCount for the FileObject will increase
too,right?

No. The VAD will be created, which will hold 1 additional ref to the control
area. The file object itself will not be addrefed.

Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
xxxxx@storagecraft.com
http://www.storagecraft.com