Programming Interface Information: This information is NOT intended to be
used as Programming Interfaces of VM/ESA. It is to be used for diagnosis only.

BLKIO

Prolog  

Control Block Contents  

BLKIO DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

BLKIO Prolog

 NAME       : HCPBLKIO
 DESCRIPTION: *BLOCKIO Device Connection Data
 DSECT      : BLKIO
 FUNCTION   : This DSECT maps data representing a successful
              connection to a device by a virtual machine
              using the *BLOCKIO system service
 LOCATED BY : VMDBLKIO field in VMDBK
              VDEVBIOA field in VDEV
 CREATED BY : HCPBIO
 DELETED BY : HCPBIO
 SERIALIZED : Unique task execution
              VMDBK dispatch lock.

 

BLKIO Control Block Content


BLKIO DSECT

Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure BLKIO *BLOCKIO Device Connection Data 0000 0 Signed 4 BLKNEXT Address of next BLKIO Block 0004 4 Bitstring 1 BLKRC SEVER return code 0005 5 Bitstring 1 BLKSTAT BLKIO status 1... .... BLKSVRD X'80' SEVER is Pending .1.. .... BLKRESET X'40' RESET is Pending 0006 6 Bitstring 2 BLKPATH IUCV path for this device 0008 8 Signed 4 BLKOFFCP CP offset for CMS disk BLKDBCCT is used to indicate the number of outstanding processes in HCPDBC. It is used to indicate that i/o may be in progress for a particular request (by HCPFTUAD). Thus BLKDBCCT and BLKDBIAD both must be 0 for there to be no outstanding *BLOCKIO for this device. 000C 12 Signed 4 BLKDBCCT Count of processes in HCPDBC 0010 16 Signed 4 BLKDBIAD Chain of outstanding DBIRQs 0014 20 Signed 4 BLKDBCWK Chain of outstanding sends to *BLOCKIO 0018 24 Bitstring 16 BLKCPARM (0) User connect parameter list 0018 24 Signed 4 BLKSIZE Block size of user's disk 001C 28 Signed 4 BLKOFFST User's requested offset 0020 32 Signed 2 BLKVDEV Virtual device address 0022 34 Bitstring 6 * Reserved for future IBM use 0028 40 Bitstring 16 BLKPARMA (0) ACCEPT parameter list 0028 40 Signed 4 BLKSTART User's starting block 002C 44 Signed 4 BLKEND User's ending block 0030 48 Bitstring 1 * Reserved for Future IBM Use 0031 49 Bitstring 1 BLKFLAGS Device status flags .... ...1 BLKDEVRD X'01' Virtual device is read only 0032 50 Bitstring 2 * Reserved for Future IBM Use 0034 52 Signed 4 BLKSPIRA Special IRA for SEVER processing 0038 56 Signed 4 BLKVDEVA Virtual device block address 003C 60 Signed 4 BLKDINFO Address of device information 0040 64 Signed 4 BLKSAVBK Caller's save block 0048 72 Dbl-Word 8 * (0) Ensure Double Word Boundary 0048 72 Dbl-Word 8 BLKLOWN (3) BLKIO lock 0060 96 Dbl-Word 8 * (0) Ensure Double Word Boundary 0060 96 Bitstring 40 BLKPARML IUCV parameter list 00000011 BLKDSIZE (*-BLKIO+7)/8 Size, in doublewords, of BLKIO

 

BLKIO Storage Layout

*** BLKIO - *BLOCKIO Device Connection Data
*
*     +---------------------------+------+------+-------------+
*   0 |         BLKNEXT           |BLKRC |:STAT |  BLKPATH    |
*     +---------------------------+------+------+-------------+
*   8 |         BLKOFFCP          |         BLKDBCCT          |
*     +---------------------------+---------------------------+
*  10 |         BLKDBIAD          |         BLKDBCWK          |
*     +---------------------------+---------------------------+
*  18 |         BLKSIZE           |         BLKOFFST          |
*     +-------------+-------------+---------------------------+
*  20 |  BLKVDEV    |/////////////////////////////////////////|
*     +-------------+-------------+---------------------------+
*  28 |         BLKSTART          |          BLKEND           |
*     +------+------+-------------+---------------------------+
*  30 |//////|:FLAGS|/////////////|         BLKSPIRA          |
*     +------+------+-------------+---------------------------+
*  38 |         BLKVDEVA          |         BLKDINFO          |
*     +---------------------------+---------------------------+
*  40 |         BLKSAVBK          |///////////////////////////|
*     +---------------------------+---------------------------+
*  48 |                                                       |
*     =                       BLKLOWN                         =
*     |                                                       |
*     +-------------------------------------------------------+
*  60 |                                                       |
*     =                       BLKPARML                        =
*     |                                                       |
*     +-------------------------------------------------------+
*  88
*
*** BLKIO - *BLOCKIO Device Connection Data

 

BLKIO Cross Reference

(contains links to field and bit definitions)
Symbol         Dspl Value
-------------- ---- -----

BLKCPARM 0018

BLKDBCCT 000C

BLKDBCWK 0014

BLKDBIAD 0010

BLKDEVRD 0031 01

BLKDINFO 003C

BLKDSIZE 0060 00000011

BLKEND 002C

BLKFLAGS 0031

BLKLOWN 0048

BLKNEXT 0000

BLKOFFCP 0008

BLKOFFST 001C

BLKPARMA 0028

BLKPARML 0060

BLKPATH 0006

BLKRC 0004

BLKRESET 0005 40

BLKSAVBK 0040

BLKSIZE 0018

BLKSPIRA 0034

BLKSTART 0028

BLKSTAT 0005

BLKSVRD 0005 80

BLKVDEV 0020

BLKVDEVA 0038


This information is based on VM/ESA 2.4.0.
Last updated on 3 Aug 1999 at 11:42:15 EDT.
Copyright IBM Corporation, 1990, 1999