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Prolog 
Control Block Contents 
   USVOL 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.


  USVOL Prolog Top of page
  
 NAME       : HCPUSVOL
 DESCRIPTION: User volume descriptor
 DSECT      : USVOL
 FUNCTION   : The USVOL area is used to describe the user
              volume list, the user volume include list
              and the user volume exclude list.
 LOCATED BY : SYSUVOL, SYSIVOL, and SYSXVOL in SYSCM
 CREATED BY : HCPSYS, HCPZPQ
 DELETED BY : no one
 
 
  USVOL Control Block Content Top of page
  




 USVOL DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      USVOL          User volume descriptor
0000    0 Address      4 USVNEXT        Pointer to next chunk or store
0004    4 Signed       4 USVCOUNT       Count of volsers in this chunk
0008    8 Signed       2 USVDEVNO       RDEV Number for USER_VOLUME_RDEV
000A   10 Bitstring    1 USVFLAGS       Flag Byte
          1... ....      USVFRDEV       X'80' USVFRDEV This is a
                                        USER_VOLUME_RDEV block
000B   11 Bitstring    5 *              Reserved for IBM use
          00000010       USVHDR         *-USVOL Length of header
          00000002       USVHDRD        (*-USVOL+7)/8 Length of header in
                                        dwords
0010   16 Character    6 USVOLSER       First volser in chunk
 
 
  USVOL Storage Layout Top of page
  
          
*** USVOL - User volume descriptor
*
*     +---------------------------+---------------------------+
*   0 |         USVNEXT           |         USVCOUNT          |
*     +-------------+------+------+---------------------------+
*   8 |  USVDEVNO   |:FLAGS|//////////////////////////////////|
*     +-------------+------+--------------------+-------------+
*  10 |                USVOLSER                 | 16
*     +-----------------------------------------+
*
*** USVOL - User volume descriptor
 
 
  USVOL Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
USVCOUNT       0004
USVDEVNO       0008
USVFLAGS       000A
USVFRDEV       000A 80
USVHDR         000B 00000010
USVHDRD        000B 00000002
USVNEXT        0000
USVOLSER       0010
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:57:30 EDT.
Copyright IBM Corporation, 1990, 2022