DS5LABEL Back to Index page
 
Prolog 
Control Block Contents 
   DS5LABEL 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.

 
  DS5LABEL Control Block Content Top of page
  




 DS5LABEL DSECT
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Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      DS5LABEL       Mapping for VTOC DSCB's
0000    0 Bitstring    4 DS5KEYID       Key identifier
0004    4 Bitstring    5 DS5AVEXT       Available extent Bytes 1-2 Rel
                                        track addr of the first track in
                                        the extent Bytes 3-4 Number of
                                        unused cyls in the extent Byte 5
                                        Number of additional unused
                                        tracks
0009    9 Bitstring   35 DS5EXTAV       Seven available extents
002C   44 Character    1 DS5FMTID       Format identifier For Format 5
                                        DSCB, DS5FMTID = c'5'.
002D   45 Bitstring   90 DS5MAVET       Eighteen available extents
0087  135 Bitstring    5 DS5PTRDS       Pointer to next Format 5 DSCB
          0000008C       DS5END         *
 
 
  DS5LABEL Storage Layout Top of page
  
          
*** DS5LABEL - Mapping for VTOC DSCB's
*
*     +---------------------------+---------------------------+
*   0 |         DS5KEYID          |        DS5AVEXT-          |
*     +------+--------------------+---------------------------+
*   8 |-(004)|                                                |
*     +------+                                                |
*  10 |                                                       |
*     =                       DS5EXTAV                        =
*     |                           +------+--------------------+
*  28 |                           |:FMTID|                    |
*     +---------------------------+------+                    |
*  30 |                                                       |
*     =                       DS5MAVET                        =
*     |                                                +------+
*     |                                                |(087)-|
*     +---------------------------+--------------------+------+
*  88 |        -DS5PTRDS          | 8C
*     +---------------------------+
*
*** DS5LABEL - Mapping for VTOC DSCB's
 
 
  DS5LABEL Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
DS5AVEXT       0004
DS5END         0087 0000008C
DS5EXTAV       0009
DS5FMTID       002C
DS5KEYID       0000
DS5MAVET       002D
DS5PTRDS       0087
 
This information is based on z/VM 7.4.0 Last updated on 24 Jun 2024 at 11:30:27 EDT.
Copyright IBM Corporation, 1990, 2024