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
    Top of page

    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 7.2.0 Last updated on 24 Jun 2020 at 09:27:56 EDT.
Copyright IBM Corporation, 1990, 2020