DS1LABEL Back to Index page
 
Prolog 
Control Block Contents 
   DS1LABEL 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.


  DS1LABEL Prolog Top of page
  
 NAME       : HCPDS1BK
 DESCRIPTION: Mapping for VTOC DSCB's
 DSECT      : DS1LABEL - VTOC DSCB Format 1 and Format 8
              DS4LABEL - VTOC DSCB Format 4
              DS5LABEL - VTOC DSCB Format 5
 FUNCTION   : HCPDS1BK is a collection of structures that are used to
              map the DSCB's that are in the VTOC of an OS formatted
              DASD.  See manual " z/OS V1R11.0 DFSMSdfp Advanced
              Services z/OS V1R11.0 SC26-7400-10", section
              "VTOC Components" for more information.
 LOCATED BY : The first DSCB (a format 4 DSCB) is point to by the
              Volume Label (record 3).
 CREATED BY : Stand-alone dump installer.
 DELETED BY : Not applicable
 REFERENCES : HCPDLJ - part of DUMPLD2
 SERIALIZED : Single-threaded nature of stand-alone dump process
 RELOCATION CONSIDERATIONS : None
 COMPATIBILITY AND MIGRATION CONCERNS : None
 NOTES      :
 
 
  DS1LABEL Control Block Content Top of page
  




 DS1LABEL DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      DS1LABEL       Mapping for VTOC DSCB's
0000    0 Character   44 DS1DSNAM       Data set name For Format 1 DSCB,
                                        DS1FMTID = c'1'.
002C   44 Character    1 DS1FMTID       Format identifier
002D   45 Character    6 DS1DSSN        Data set serial number
0033   51 Bitstring    2 DS1VOLSQ       Volume sequence number
0035   53 Bitstring    3 DS1CREDT       Creation date: ydd
0038   56 Bitstring    3 DS1EXPDT       Expiration date: ydd
003B   59 Bitstring    1 DS1NOEPV       Number of extents on volume
003C   60 Bitstring    1 DS1NOBDB       No. of bytes used in last
                                        direction blk
003D   61 Bitstring    1 DS1FLAG1       Flag 1
003E   62 Character   13 DS1SYSCD       System code
004B   75 Bitstring    3 DS1REFD        Date last referenced
004E   78 Bitstring    1 DS1SMSFG       System managed storage indicators
004F   79 Bitstring    1 DS1SCXTF       Secondary space extension flag
                                        byte
0050   80 Bitstring    2 DS1SCXTV       Secondary space extension value
0052   82 Bitstring    1 DS1DSOR1       Data set organization byte 1
0053   83 Bitstring    1 DS1DSOR2       Data set organization byte 2
0054   84 Bitstring    1 DS1RECFM       Record format
0055   85 Bitstring    1 DS1OPTCD       Option code
0056   86 Bitstring    2 DS1BLKL        Block length
0058   88 Bitstring    2 DS1LRECL       Record length
005A   90 Bitstring    1 DS1KEYL        Key length
005B   91 Bitstring    2 DS1RKP         Relative key position
005D   93 Bitstring    1 DS1DSIND       Data set indicators
005E   94 Bitstring    1 DS1SCAL1       Secondary allocation flag byte
005F   95 Character    3 DS1SCAL3       Secondary allocation quantity
0062   98 Bitstring    3 DS1LSTAR       Last used track and block on
                                        track
0065  101 Bitstring    2 DS1TRBAL       Space remaining on last used
                                        track
0067  103 Bitstring    2 DS1RES1        Reserved Following extent
                                        descriptions consist of First
                                        byte - Extent type indicator
                                        Second byte - Extent sequence
                                        number Third - sixth bytes -
                                        Extent lower limit Seventh -
                                        tenth bytes - Extent upper limit
0069  105 Bitstring   10 DS1EXT1        First extent description
          .11. 1.11      DS1EXT1L       DS1EXT1+2 DS1EXT1L Extent Lower
                                        limit
          .11. 1111      DS1EXT1U       DS1EXT1+6 DS1EXT1U Extent Upper
                                        limit
0073  115 Bitstring   10 DS1EXT2        Second extent description
007D  125 Bitstring   10 DS1EXT3        Third extent description
0087  135 Bitstring    5 DS1PTRDS       Possible pointer to F2 or F3 DSCB
          0000008C       DS1END         *
         DSECT for VTOC DSCB Format 4 Records
      Bit mappings of unuseful flag bytes are not shown.
      Offsets for all DS4LABEL are based from start of key, not
      start of data.
 
 
  DS1LABEL Storage Layout Top of page
  
          
*** DS1LABEL - Mapping for VTOC DSCB's
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       DS1DSNAM                        =
*     |                           +------+--------------------+
*  28 |                           |:FMTID|     DS1DSSN-       |
*     +--------------------+------+------+--------------------+
*  30 |      -(02D)        |  DS1VOLSQ   |     DS1CREDT       |
*     +--------------------+------+------+------+-------------+
*  38 |     DS1EXPDT       |:NOEPV|:NOBDB|:FLAG1|             |
*     +--------------------+------+------+------+             |
*     |                       DS1SYSCD                        |
*     |                    +--------------------+------+------+
*  48 |                    |      DS1REFD       |:SMSFG|:SCXTF|
*     +-------------+------+------+------+------+------+------+
*  50 |  DS1SCXTV   |:DSOR1|:DSOR2|:RECFM|:OPTCD|  DS1BLKL    |
*     +-------------+------+------+------+------+------+------+
*  58 |  DS1LRECL   |:KEYL |   DS1RKP    |:DSIND|:SCAL1|(05F)-|
*     +-------------+------+-------------+------+------+------+
*  60 | -DS1SCAL3   |     DS1LSTAR       |  DS1TRBAL   |:RES1-|
*     +------+------+--------------------+-------------+------+
*  68 |-(067)|                    DS1EXT1                     |
*     +------+             +----------------------------------+
*  70 |                    |             DS1EXT2              |
*     +--------------------+             +--------------------+
*  78 |                                  |      DS1EXT3       |
*     +----------------------------------+             +------+
*     |                                                |(087)-|
*     +---------------------------+--------------------+------+
*  88 |        -DS1PTRDS          | 8C
*     +---------------------------+
*
*** DS1LABEL - Mapping for VTOC DSCB's
 
 
  DS1LABEL Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
DS1BLKL        0056
DS1CREDT       0035
DS1DSIND       005D
DS1DSNAM       0000
DS1DSOR1       0052
DS1DSOR2       0053
DS1DSSN        002D
DS1END         0087 0000008C
DS1EXPDT       0038
DS1EXT1        0069
DS1EXT1L       0069 6B
DS1EXT1U       0069 6F
DS1EXT2        0073
DS1EXT3        007D
DS1FLAG1       003D
DS1FMTID       002C
DS1KEYL        005A
DS1LRECL       0058
DS1LSTAR       0062
DS1NOBDB       003C
DS1NOEPV       003B
DS1OPTCD       0055
DS1PTRDS       0087
DS1RECFM       0054
DS1REFD        004B
DS1RES1        0067
DS1RKP         005B
DS1SCAL1       005E
DS1SCAL3       005F
DS1SCXTF       004F
DS1SCXTV       0050
DS1SMSFG       004E
DS1SYSCD       003E
DS1TRBAL       0065
DS1VOLSQ       0033
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:49:55 EDT.
Copyright IBM Corporation, 1990, 2022