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Prolog 
Control Block Contents 
   SSQBK DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  SSQBK Prolog Top of page
  
 NAME       : HCPSSQBK
 DESCRIPTION: SPXTAPE Section Quorum Block
 DSECT      : SSQBK
 FUNCTION   : Work area to hold the data page
              system virtual addresses for one
              allotment of read buffers.
 LOCATED BY :
              Routines:
              HCPSPXDR - read file and save ASA's
              HCPSPYTM - lock vpages and build channel program
              HCPSPXTI - unlock vpages and return count to pool
              Control block fields:
              TKTSSQ   - head of queue in the TKTBK
              SSQNEXT  - next in queue
 CREATED BY : HCPSPXDU - for SPXTAPE DUMP commands
              HCPSPZRI - for SPXTAPE LOAD commands
 DELETED BY : HCPSPORR - for SPXTAPE DUMP commands
              HCPSPOFV - for SPXTAPE DUMP commands
              HCPSPNDW - for SPXTAPE LOAD commands
 RELOCATION CONSIDERATIONS : None
 
 
  SSQBK Control Block Content Top of page
  




 SSQBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      SSQBK          SPXTAPE Section Quorum Block
0000    0 Signed       4 SSQNEXT        Next work area
0004    4 Bitstring    1 SSQFLAG        Flags for this quorum
          .1.. ....      SSQDONE        X'40' SSQDONE SSQ's pages have
                                        all been included in a channel
                                        pgm by the tape write routine
          ..1. ....      SSQTAKEN       X'20' SSQTAKEN SSQBK selected for
                                        output processing
          .... 1...      SSQEOF         X'08' SSQEOF End of file with
                                        this block
          .... .1..      SSQREADY       X'04' SSQREADY Reads complete for
                                        this quorum (has VAs or 0s) Does
                                        not contain any ASAs
          .... ...1      SSQERROR       X'01' SSQERROR Read errors
                                        detected
0005    5 Bitstring    1 * (3)          Reserved
0008    8 Signed       4 SSQPAGCT       Count of data pages in section
000C   12 Signed       4 SSQPAGNO       File relative page number of
                                        first page
0010   16 Signed       4 SSQCMCUR       Last committed current slot.
                                        Point of back out in case of I/O
                                        error.
0014   20 Signed       4 SSQCUR         Current slot
0018   24 Signed       4 SSQEND         Address past last slot
001C   28 Signed       4 SSQDASWT       Waiting CPEBK when DASD I/O done
0020   32 Signed       4 SSQWTCNT       Count of DASD tasks to end wait
0024   36 Signed       4 SSQVPGS (32)   Slots for this group of pages
          00000080       SSQVPLEN       *-SSQVPGS Size of the page list
                                        area
          00000020       SSQALLOT       SSQVPLEN/4 Standard quorum
                                        allotment count
          00000015       SSQDWLEN       (*-SSQBK+7)/8 Size in double
                                        words
 
 
  SSQBK Storage Layout Top of page
  
          
*** SSQBK - SPXTAPE Section Quorum Block
*
*     +---------------------------+------+--------------------+
*   0 |         SSQNEXT           |:FLAG |////////////////////|
*     +---------------------------+------+--------------------+
*   8 |         SSQPAGCT          |         SSQPAGNO          |
*     +---------------------------+---------------------------+
*  10 |         SSQCMCUR          |          SSQCUR           |
*     +---------------------------+---------------------------+
*  18 |          SSQEND           |         SSQDASWT          |
*     +---------------------------+---------------------------+
*  20 |         SSQWTCNT          |                           |
*     +---------------------------+                           |
*  28 |                                                       |
*     =                       SSQVPGS                         =
*     |                           +---------------------------+
*     |                           | A4
*     +---------------------------+
*
*** SSQBK - SPXTAPE Section Quorum Block
 
 
  SSQBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
SSQALLOT       0024 00000020
SSQCMCUR       0010
SSQCUR         0014
SSQDASWT       001C
SSQDONE        0004 40
SSQDWLEN       0024 00000015
SSQEND         0018
SSQEOF         0004 08
SSQERROR       0004 01
SSQFLAG        0004
SSQNEXT        0000
SSQPAGCT       0008
SSQPAGNO       000C
SSQREADY       0004 04
SSQTAKEN       0004 20
SSQVPGS        0024
SSQVPLEN       0024 00000080
SSQWTCNT       0020
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:57:04 EDT.
Copyright IBM Corporation, 1990, 2022