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Programming Interface Information:
This information is NOT intended to be used as Programming Interfaces of z/VM. |
QDISK
Control Block Contents
QDISK DSECT
Cross Reference (Contains links to field and bit definitions)
QDISK Prolog
Name : QDISK control block for Virtual Disk in Storage
Description: Q-Disk Control Block
DSECT : QDISK
Function : This control block maps the Qdisk block used
to define and manage a virtual disk in storage.
Located by : MDIQDISK field of MDISK block for Vdisk
Created by : HCPQDKCR
Deleted by : HCPQDKDS
QDISK Control Block Content
QDISK DSECT
Hex Dec Type/Val Lng Label (dup) Comments
---- ---- --------- ---- -------------- --------
0000 0 Structure QDISK Q-Disk Control Block
Vdisk definition fields
0000 0 Dbl-Word 8 QDILOCK (3) Vdisk I/O lock for this Vdisk
0018 24 Dbl-Word 8 QDIIASIT I-ASIT for this Vdisk
0020 32 Character 24 QDISNAME Address Space Name for this Vdisk
0038 56 Signed 4 QDIIOCNT Count of virtual I/Os to Vdisk
003C 60 Bitstring 6 QDITOD TOD value (used as Qdisk
identifier)
0042 66 Bitstring 1 QDIDFLGS Vdisk Definition Flags
1... .... QDIFWRIT X'80' First write to Vdisk has
occurred
0043 67 Bitstring 1 * Reserved
Data specific to a channel program
0044 68 Signed 4 QDIDATA (0)
CCW information
0044 68 Bitstring 16 QDIDEFXT Define Extent data (mapped by
DEFXTNT DSECT in HCPQDL)
0054 84 Bitstring 8 QDILOCAT Locate data (mapped by LOCDATA
DSECT in HCPQDL)
005C 92 Bitstring 1 QDILAST Last CCW opcode
Flags
005D 93 Bitstring 1 QDIFLAGA QDISK I/O Flags A
1... .... QDIFIRST X'80' First CCW processing
complete
.1.. .... QDIDFXTU X'40' Define Extent used
..1. .... QDIRIPLU X'20' Read IPL used
...1 .... QDILOCU X'10' Locate used
.... .1.. QDIWRITE X'04' Writes allowed
.... ..1. QDIFRMAT X'02' Formatting writes allowed
.... ...1 QDIDIAG X'01' Diagnostics allowed
005E 94 Bitstring 1 QDIFLAGB QDISK I/O Flags B
1... .... QDIRD X'80' Read State established
.1.. .... QDIRDRP X'40' Read Replicated established
..1. .... QDIWT X'20' Write state established
...1 .... QDIDRDV X'10' Read Verify in effect
.... 1... QDIMEA X'08' Microcode Erase Alert
requested
.... .1.. QDISBA X'04' Send Block Address
requested
.... ..1. QDIUCP X'02' Present unit check on
paging error
005F 95 Bitstring 1 QDIFLAGC Reserved
0060 96 Bitstring 4 QDIDGDAT Diagnostic Control data
0064 100 Signed 4 * Reserved for future use
00000024 QDIDATSZ *-QDIDATA Data area size
Sense Information
0068 104 Bitstring 32 QDISENSE Sense data area
00000020 QDISNSIZ *-QDISENSE Sense data size
Snap Data Parameter List for HCPSAC related soft abends
0088 136 Dbl-Word 8 * (0)
0088 136 Bitstring 16 QDISDPL Snap data list
00000010 QDISLSIZ *-QDISDPL Snap list size
Accounting information
0098 152 Signed 4 QDIATIM Time of creation or last ACNT
009C 156 Character 8 QDIACTNM Account number of owner
00000015 QDISIZE ((*-QDISK+7)/8) SIZE IN DWS FOR
FREE/FRET
QDISK Storage Layout
*** QDISK - Q-Disk Control Block
*
* +-------------------------------------------------------+
* 0 | |
* = QDILOCK =
* | |
* +-------------------------------------------------------+
* 18 | QDIIASIT |
* +-------------------------------------------------------+
* 20 | |
* = QDISNAME =
* | |
* +---------------------------+---------------------------+
* 38 | QDIIOCNT | QDITOD- |
* +-------------+------+------+---------------------------+
* 40 | -(03C) |:DFLGS|//////| |
* +-------------+------+------+ |
* | QDIDEFXT |
* | +---------------------------+
* | | QDILOCAT- |
* +---------------------------+------+------+------+------+
* 58 | -(054) |:LAST |:FLAGA|:FLAGB|:FLAGC|
* +---------------------------+------+------+------+------+
* 60 | QDIDGDAT |///////////////////////////|
* +---------------------------+---------------------------+
* 68 | |
* = QDISENSE =
* | |
* +-------------------------------------------------------+
* 88 | QDISDPL |
* | |
* +---------------------------+---------------------------+
* 98 | QDIATIM | QDIACTNM- |
* +---------------------------+---------------------------+
* A0 | -(09C) | A4
* +---------------------------+
*
*** QDISK - Q-Disk Control Block
QDISK Cross Reference
Symbol Dspl Value -------------- ---- ----- QDIACTNM 009C QDIATIM 0098 QDIDATA 0044 QDIDATSZ 0064 00000024 QDIDEFXT 0044 QDIDFLGS 0042 QDIDFXTU 005D 40 QDIDGDAT 0060 QDIDIAG 005D 01 QDIDRDV 005E 10 QDIFIRST 005D 80 QDIFLAGA 005D QDIFLAGB 005E QDIFLAGC 005F QDIFRMAT 005D 02 QDIFWRIT 0042 80 QDIIASIT 0018 QDIIOCNT 0038 QDILAST 005C QDILOCAT 0054 QDILOCK 0000 QDILOCU 005D 10 QDIMEA 005E 08 QDIRD 005E 80 QDIRDRP 005E 40 QDIRIPLU 005D 20 QDISBA 005E 04 QDISDPL 0088 QDISENSE 0068 QDISIZE 009C 00000015 QDISLSIZ 0088 00000010 QDISNAME 0020 QDISNSIZ 0068 00000020 QDITOD 003C QDIUCP 005E 02 QDIWRITE 005D 04 QDIWT 005E 20
Copyright IBM Corporation, 1990, 2001