PRE-PROCESSING AND POST-PROCESSING OF QIO REQUESTS

The following sections are included:

• Common Pre-processing

  • Checking LUN legality and the effective address of UCB

  • Checking and processing of EFN (Event Flag Number) and IOSB (I/O Status Block)

  • Creating an I/O packet

  • Checking the validity of the function code

  • Setting directive status $DSW

• Function-dependent Pre-processing

  • Pre-processing for control functions

  • Pre-processing for no-operation function

  • Pre-processing for transfer function

  • Pre-processing for ACP function

• Functions of Polishing Routines

• Post-processing