// wdm.h
ULONG MmGetMdlByteCount(
[in] PMDL Mdl
);
View the official Windows Driver Kit DDI referenceNo description available.
The MmGetMdlByteCount macro returns the length, in bytes, of the buffer described by the specified MDL.
MdlA pointer to an MDL structure that describes the layout of a virtual memory buffer in physical memory. For more information, see Using MDLs.
MmGetMdlByteCount returns the length, in bytes, of the buffer described by Mdl.
Macro definition:
#define MmGetMdlByteCount(Mdl) ((Mdl)->ByteCount)
Callers of MmGetMdlByteCount can be running at any IRQL. Usually, callers are running at IRQL <= DISPATCH_LEVEL.