PDSBK | Back to Index page

| Prolog Control Block Contents PDSBK 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.

PDSBK Prolog | Top of page

     NAME       : HCPPDSBK
     DESCRIPTION: Partitioned Data Set Block
     DSECT      : PDSBK
     FUNCTION   : The PDSBK describes the contents of CMS partitioned
                  data set headers.
     LOCATED BY : It is record number 1 of the CMS file
     CREATED BY : None
     DELETED BY : None
     RELOCATION CONSIDERATIONS : None
     NOTES      : This description of the PDS directory description
                  record was extracted from the CMS file PDSSECT MACRO.
                  The CMS definitions are shown here, too.  It makes for
                  cluttered listing, but it helps to see the CMS
                  original definitions.

PDSBK Control Block Content | Top of page

     PDSBK DSECT
    Top of page

    Hex   Dec Type/Val   Lng Label (dup)    Comments
    ---- ---- --------- ---- -------------- --------
    0000    0 Structure      PDSBK          Partitioned Data Set Block
               LIBPDS format
    0000    0 Character    6 PDSNID         LIBPDS (new format) id
              11.1 .111      PDSNFNEW       C'P' PDSNFNEW Check PDSNID+3, old
                                            vs new.
    0006    6 Bitstring    1 PDSNFLG1       Flag1.
              .1.1 1.11      PDSNTEMPF      C'$' PDSNTEMPF Dir is in $PDSTEMP
                                            file.
    0007    7 Bitstring    1 PDSNFLG2       Flag2.
    0008    8 Signed       4 PDSNDRSZ       Directory size in bytes
    000C   12 Signed       4 PDSNDST        Directory starts at this record
                                            number
    0010   16 Signed       4 PDSNNTSZ       Each directory entry is this
                                            number of bytes long
              00000014       PDSNSZ         *-PDSBK Size for LIBPDS format
           Old DMSLIB format
    0000    0 Character    6 PDSOID         DMSLIB (old format) id
    0006    6 Signed       2 PDSODST        Directory starts at this record
                                            number
    0008    8 Signed       1 *
    0009    9 Signed       1 *
    000A   10 Signed       2 PDSODRSZ       Directory size in bytes
    000C   12 Signed       2 *
    000E   14 Signed       1 *
    000F   15 Signed       1 *
    0010   16 Signed       4 PDSODRLN       Each entry size in bytes
              00000014       PDSOSZ         *-PDSBK Size for CMSLIB format
           Old MACLIB format
    0000    0 Character    6 PDSMID         MACLIB (old format) id
    0006    6 Signed       2 PDSMDST        Directory starts at this record
                                            number
    0008    8 Signed       2 PDSMDRSZ       Directory size in bytes
    000A   10 Signed       2 DIRNAME (3)    MACLIB IDENTIFIER
    0010   16 Signed       2 DIRPTR         ITEM PTR TO START OF DIRECTORY
    0012   18 Bitstring    1 TEMPBYTE       IF $ , THEN PDS IS IN $PDSTEMP
                                            FILE
    0013   19 Bitstring    1 NEWBLKS        NO. NEW BLKS ADDED TO PDS BY STOW
    0014   20 Signed       2 CORESIZE       SIZE OF DICTIONARY IN BYTES
    0016   22 Signed       2 PDSBLKSI       BLOCKSIZE OF DICTIONARY
    0018   24 Bitstring    1 CHNGBYTE       INDICATES UPDATES TO DICTIONARY
    0019   25 Bitstring    1 *              NOT USED -
              0000001A       PDSMSZ         *-PDSBK Size for MACLIB format
           End of PDS formats
              00000004       PDSBKSZ        (*-PDSBK+7)/8 Max size of PDSBK
                                            (d-words)

PDSBK Storage Layout | Top of page

    *** PDSBK - Partitioned Data Set Block
    *
    *     +-------------------------------------------------------+
    *   0 |///////////////////////////////////////////////////////|
    *     =///////////////////////////////////////////////////////=
    *     |/////////////+-----------------------------------------+
    *     |/////////////|
    *     +-------------+
    *
    *** PDSBK - Partitioned Data Set Block

    *** Overlay for PDSBK in PDSBK
    *
    *     +-----------------------------------------+------+------+
    *   0 |                 PDSNID                  |:NFLG1|:NFLG2|
    *     +---------------------------+-------------+------+------+
    *   8 |         PDSNDRSZ          |         PDSNDST           |
    *     +---------------------------+---------------------------+
    *  10 |         PDSNNTSZ          | 14
    *     +---------------------------+
    *
    *** Overlay for PDSBK in PDSBK

    *** Overlay for PDSBK in PDSBK
    *
    *     +-----------------------------------------+-------------+
    *   0 |                 PDSOID                  |  PDSODST    |
    *     +------+------+-------------+-------------+------+------+
    *   8 |//////|//////|  PDSODRSZ   |/////////////|//////|//////|
    *     +------+------+-------------+-------------+------+------+
    *  10 |         PDSODRLN          | 14
    *     +---------------------------+
    *
    *** Overlay for PDSBK in PDSBK

    *** Overlay for PDSBK in PDSBK
    *
    *     +-----------------------------------------+-------------+
    *   0 |                 PDSMID                  |  PDSMDST    |
    *     +-------------+---------------------------+-------------+
    *   8 |  PDSMDRSZ   |                DIRNAME                  |
    *     +-------------+------+------+-------------+-------------+
    *  10 |   DIRPTR    |:PBYTE|:BLKS |  CORESIZE   |  PDSBLKSI   |
    *     +------+------+------+------+-------------+-------------+
    *  18 |:GBYTE|//////| 1A
    *     +------+------+
    *
    *** Overlay for PDSBK in PDSBK

PDSBK Cross Reference | Top of page

    Symbol         Dspl Value
    -------------- ---- -----
    CHNGBYTE       0018
    CORESIZE       0014
    DIRNAME        000A
    DIRPTR         0010
    NEWBLKS        0013
    PDSBKSZ        0019 00000004
    PDSBLKSI       0016
    PDSMDRSZ       0008
    PDSMDST        0006
    PDSMID         0000
    PDSMSZ         0019 0000001A
    PDSNDRSZ       0008
    PDSNDST        000C
    PDSNFLG1       0006
    PDSNFLG2       0007
    PDSNFNEW       0000 D7
    PDSNID         0000
    PDSNNTSZ       0010
    PDSNSZ         0010 00000014
    PDSNTEMPF      0006 5B
    PDSODRLN       0010
    PDSODRSZ       000A
    PDSODST        0006
    PDSOID         0000
    PDSOSZ         0010 00000014
    TEMPBYTE       0012

This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:29:35 EDT.
Copyright IBM Corporation, 1990, 2020