suse man page for struct_irb

STRUCT 
IRB(9)							    The ccw bus 						     STRUCT IRB(9)

NAME
       struct_irb - interruption response block

SYNOPSIS
       struct irb {
	 union scsw scsw;
	 union esw;
	 __u8 ecw[32];
       };

MEMBERS
       scsw
	   subchannel status word

       esw
	   extened status word, 4 formats

       ecw[32]
	   extended control word

DESCRIPTION
       The irb that is handed to the device driver when an interrupt occurs. For solicited interrupts, the common I/O layer already performs
       checks whether a field is valid; a field not being valid is always passed as 0. If a unit check occured, ecw may contain sense data; this
       is retrieved by the common I/O layer itself if the device doesn't support concurrent sense (so that the device driver never needs to
       perform basic sene itself). For unsolicited interrupts, the irb is passed as-is (expect for sense data, if applicable).

AUTHOR
       Cornelia Huck <cornelia.huck@de.ibm.com>
	   Author.

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							     STRUCT IRB(9)