QDGBL

Prolog  

Control Block Contents  
   QDGBL DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

QDGBL Prolog

 Name       : Virtual Disk in Storage Global Control Block
 Description: V-Disk Global Control Block
 DSECT      : QDGBL
 Function   : This control block maps the global V-Disk
              control block for the system.
 Located by : HCPSYSCM - System Common Area
 Created by : HCPQDLIN
 Deleted by : none

QDGBL Control Block Content

QDGBL DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      QDGBL          V-Disk Global Control Block
     Vdisk chain of MDISK blocks and allocation lockword
0000    0 Dbl-Word     8 QDGALOCK (3)   Vdisk Allocation Lockword
0018   24 Signed       4 QDGMDISK       First MDISK block for Vdisk
     Fields for keeping track of limits (in blocks)
001C   28 Signed       4 QDGSYSLM       Limit of total Vdisk allocation
0020   32 Signed       4 QDGUSRLM       Limit of size of Vdisks DEFINEd
                                        by a user (using DEFINE)
0024   36 Signed       4 QDGSYSCA       Total currently-allocated Vdisk
                                        blocks
0028   40 Signed       2 *              Reserved
002A   42 Signed       2 QDGCOUNT       Vdisk counter for addr. space
                                        name (increment and save)
002C   44 Signed       4 QDGLKCNT       Total number of LINKs to all
                                        Vdisks (includes 1 for each
                                        DEFINEd VDisk)
0030   48 Signed       4 QDGDISKS       Total number of existing Vdisks
0034   52 Signed       4 QDGSYSLD       Default of QDGSYSLM
0038   56 Signed       4 QDGUSRLD       Default of QDGUSRLM
003C   60 Bitstring    1 QDGAFLAG       'A' flag byte
          1... ....      QDGASYSC       X'80' - SYSTEM CONFIG set syslim
003D   61 Bitstring    1 * (3)          Reserved
          00000008       QDGSIZE        ((*-QDGBL+7)/8) SIZE IN DWS FOR
                                        FREE/FRET

QDGBL Storage Layout

          
*** QDGBL - V-Disk Global Control Block
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       QDGALOCK                        =
*     |                                                       |
*     +---------------------------+---------------------------+
*  18 |         QDGMDISK          |         QDGSYSLM          |
*     +---------------------------+---------------------------+
*  20 |         QDGUSRLM          |         QDGSYSCA          |
*     +-------------+-------------+---------------------------+
*  28 |/////////////|  QDGCOUNT   |         QDGLKCNT          |
*     +-------------+-------------+---------------------------+
*  30 |         QDGDISKS          |         QDGSYSLD          |
*     +---------------------------+------+--------------------+
*  38 |         QDGUSRLD          |:AFLAG|////////////////////|
*     +---------------------------+------+--------------------+
*  40
*
*** QDGBL - V-Disk Global Control Block

QDGBL Cross Reference

Symbol         Dspl Value
-------------- ---- -----
QDGAFLAG       003C
QDGALOCK       0000
QDGASYSC       003C 80
QDGCOUNT       002A
QDGDISKS       0030
QDGLKCNT       002C
QDGMDISK       0018
QDGSIZE        003D 00000008
QDGSYSCA       0024
QDGSYSLD       0034
QDGSYSLM       001C
QDGUSRLD       0038
QDGUSRLM       0020