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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. |
SSQBK
Cross Reference (Contains links to field and bit definitions)
SSQBK Prolog
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
SSQBK Control Block Content
SSQBK DSECT
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. .... SSQTAKEN X'20' SSQBK selected for output processing .... 1... SSQEOF X'08' End of file with this block .... .1.. SSQREADY X'04' Reads complete for this quorum (has VAs or 0s) Does not contain any ASAs .... ...1 SSQERROR X'01' 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
*** 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
(contains links to field and bit definitions)Symbol Dspl Value -------------- ---- -----SSQALLOT 0024 00000020
SSQCMCUR 0010
SSQCUR 0014
SSQDASWT 001C
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
Last updated on 3 Aug 1999 at 13:38:59 EDT.
Copyright IBM Corporation, 1990, 1999