Drive read-write mode

 1 PIO_STACK_LOCATION isl = IoGetCurrentIrpStackLocation(pIrp);
 2 
 3     //Read & Write Length
 4     ULONG dwInSize = isl->Parameters.Read.Length;
 5     ULONG dwOutSize = isl->Parameters.Write.Length;
 6 
 7     //In & Out Buffer DO_BUFFERED_IO
 8     PVOID pInBuffer = pIrp->AssociatedIrp.SystemBuffer;
 9     PVOID pOutBuffer = pIrp->AssociatedIrp.SystemBuffer;
10 
11     //In & Out Buffer DO_DIRECT_IO 
12     pInBuffer = MmGetSystemAddressForMdlSafe(pIrp->MdlAddress, NormalPagePriority);
13     pOutBuffer = MmGetSystemAddressForMdlSafe(pIrp->MdlAddress, NormalPagePriority);
14 
15     //In & Out Buffer DO_DIRECT_IO 
16     ProbeForRead(pIrp->UserBuffer, dwInSize, 4);
17     pInBuffer = pIrp->UserBuffer;
18     ProbeForWrite(pIrp->UserBuffer, dwOutSize, 4);
19     pOutBuffer = pIrp->UserBuffer;
20 
21     //Io control device
22     ULONG dwCtrlCoder = isl->Parameters.DeviceIoControl.IoControlCode;
23     //Read & Write Length
24     dwInSize = isl->Parameters.DeviceIoControl.InputBufferLength;
25     dwOutSize = isl->Parameters.DeviceIoControl.OutputBufferLength;
26     
27     //In & Out Buffer METHOD_BUFFERED || METHOD_IN_DIRECT || METHOD_OUT_DIRECT || METHOD_NEITHER I/O
28     pInBuffer = pIrp->AssociatedIrp.SystemBuffer;
29     pOutBuffer = pIrp->AssociatedIrp.SystemBuffer;
30 
31     //In & Out Buffer METHOD_IN_DIRECT || METHOD_OUT_DIRECT
32     pInBuffer = pIrp->AssociatedIrp.SystemBuffer;
33     pOutBuffer = MmGetSystemAddressForMdlSafe(pIrp->MdlAddress, NormalPagePriority);
34 
35     //In & Out Buffer METHOD_NEITHER I/O
36     
37     pInBuffer = isl->Parameters.DeviceIoControl.Type3InputBuffer;
38     ProbeForRead(pInBuffer, dwInSize, 4);
39     pOutBuffer = pIrp->UserBuffer;
40     ProbeForRead(pOutBuffer, dwOutSize, 4);